Parts made of a plastic for holding wires, cables and other lines .
Plastic seal consists of two parts , one end is a square plastic mouth , which has a flexible plastic hook buckle , the other end is a plastic body with a serrated seal strip , strip across the front of the body can be bent to form a ring of plastic mouth and equipment, like pants belt can be used as a cable bundle . As the seal of the body can be flexible plastic serrated plastic buckle adhesion mouth , so plastic seals can play a very strong role in fixing .
Lock sets, cylinder made of metal , plastic outsourcing ABS plastic spring clip lock for the structure, the lock body surface using blanching , laser type and serial number , bar code , color can be customized according to the user , wire diameter φ1 requirements. 8 , length can be produced according to user requirements , pull up F ≥ 250KG.
Scope : For Customs containers, tankers, container trucks and other purposes.
Classification and role of container seals
Container seals container is a lock , but can only be used once, after opening on the bad, can not be reused .
There are two titles above , is unique, if consistent with the bill of lading number on the client to get the container seals , on behalf of unopened containers , cargo intact. It is not the marks, logos refers to packaging and printing mark the goods, not the same thing .
1 , seal the classification
( 1 ) imposed by the seal can be divided into :
Factory sealed ( factory seal is export factories added) ;
Shut ( seals , namely customs seals, Customs added ) ; ship seal ( shipping company seals, shipping companies added) ;
Temporary closure of the pier ( Pier temporary seal is Pier added).
( 2) seal materials and functions can be divided into : high security seal , digital security seals Fixed Length plastic seal, bolt seals , metal seals , plastic wire , plastic seals , security seals , common seal.
2 , when a temporary seal plus dock
( 1 ) When unloading accidentally ruining the seal on the back door of the cabinet ;
( 2 ) within the cabinet after unloading pier demolition cabinets, put away when the first shipment to the consignee.
3, the operation of the program
(I) Zhongshan (Feeder) - Yantian (mlthervessel) - overseas that sub- salt Zhongshan barge to the ship , the ship then each cabinet in Zhongshan in Yantian transit declaration , the tunic on the front barge following two approaches :
( 1 ) increase the boat 's rear door cabinet seal , seal numbers virtue of the declaration ( Customs clearance without lock ) . The export factories do cabinet ( ie, installed cabinets ) is generally combined with temporary plant closures to prevent the plant from Yamaguchi to Zhongshan Port 's cabinet during the land stolen goods . Plus shipping company seal rare cases , if the starting point of the ship 's liability for the DOOR export plant (DOORTODOOR, DOORTOCY under ) , you might do in the cabinet when the export plant .
( 2 ) the cabinet only barge company seal without customs seal , Yantian installed before the ship also need to increase the shipping company seal . Barge in Zhongshan customs clearance M / F (Manifest boat slips , manifest ) , Customs put M / F into the computer (M / F have each cabinet SealNO on . , That filing cabinet title ) mechanical security seals, when local customs from Yantian customs online call out to the cabinets, are the same.
(II) in Dongguan , Shekou then loaded trailer support ship export , tons of vehicles or containers in Dongguan, Shekou customs transit , then: in Dongguan add only customs seals. Shekou installed before the ship again to the shipping company seal , but if the shipping company responsible for Dongguan, Shekou to land, namely DR (DOOR)-CY or DR-DR, then add the shipping company in Dongguan seal .
(III) Zhongshan - Hong Kong - overseas , some companies as follows : plus two seals on the cabinet rear door , one is in Zhongshan - Hong Kong 's first drive feeder ; another in Hong Kong - two -way foreign ship (mothervessel or oceanvessel) , and in the B / L documents related to the S / N (SealNO.) column to display only one title . If you encounter customs check counters are two Seal simultaneously cut . After the investigation to be re- applied seal ( get two new seals plus ) , on the documents displayed NewSealNO..
pull tight security seals
pull tight security seals
2014年1月9日星期四
2014年1月1日星期三
Cool summer home of the installation of a security seals and windows sealed
The heat of summer has arrived , the people went out to run around the house it is difficult to avoid the heat of harassment , if no air conditioning , it kind of really nowhere to escape the heat unbearable . But it can not always stay in air-conditioned room now ! Not only that easy to get "Air conditioning disease " and a summer off , electricity is a big amount of overhead . Is there anything more environmentally friendly home cool in summer methods?
In fact, the only sure brains, plastic padlock security seals some of the insulation program can be used in the renovation or reconstruction of a number of small local home coup sufficient in the case of no air conditioning so that the indoor temperature dropped several degrees , not only cool , and very environmentally friendly too ! If the installation of doors and windows sealed to prevent indoor air loss, coupled with the balcony door insulation, roof top layer of aluminum foil stickers , window awning peripherals , and even wall planting point " Climbing Tiger" , can make the indoor air temperature decreased .
However, the most environmentally friendly and practical , cost-effective way to install windows and doors to seal it. For now some of the doors , steel doors , etc. due to poor production and installation quality gap lax, ventilate in winter , summer into heat, sound insulation is not good. Recommended to install windows and doors seal, this seal of simple installation, low cost, the effect is very obvious , it is for you to save energy ---- prevent the loss of the air conditioner . Even if your home has a seal housing ,high security seal you should also check in the season , choose to have the wind blows , the seams hand feel for whether there is a gap , if we feel the wind, proved a bad sealing doors and windows , the importance of early replacement seal.
In fact, the only sure brains, plastic padlock security seals some of the insulation program can be used in the renovation or reconstruction of a number of small local home coup sufficient in the case of no air conditioning so that the indoor temperature dropped several degrees , not only cool , and very environmentally friendly too ! If the installation of doors and windows sealed to prevent indoor air loss, coupled with the balcony door insulation, roof top layer of aluminum foil stickers , window awning peripherals , and even wall planting point " Climbing Tiger" , can make the indoor air temperature decreased .
However, the most environmentally friendly and practical , cost-effective way to install windows and doors to seal it. For now some of the doors , steel doors , etc. due to poor production and installation quality gap lax, ventilate in winter , summer into heat, sound insulation is not good. Recommended to install windows and doors seal, this seal of simple installation, low cost, the effect is very obvious , it is for you to save energy ---- prevent the loss of the air conditioner . Even if your home has a seal housing ,high security seal you should also check in the season , choose to have the wind blows , the seams hand feel for whether there is a gap , if we feel the wind, proved a bad sealing doors and windows , the importance of early replacement seal.
2013年12月16日星期一
How to install windows and doors seal ?
Doors and windows sealed into glass sealing tape and tops two kinds. Sealing strip is generally used in the sash , the layering and doors have special sealing strip groove , the main role is through layering and the fan wearing a sealing strip , glass and frame allow fans a closer, thus ensuring the doors and windows air tightness ; installation position sealing tape should be smooth, without curl not stretch , joints should be less than 1mm, sealing strip should match the model , so that the pressure of the pressure over the General Assembly does not go too small will seal strips easy to fall off , glass and fan body is not close , there will be gaps. Sealing tape should use non-toxic, tasteless green special sealing tape .
Installation site on the tops of the doors and windows generally fan, box fan or a seal around the bridge ( wind block ), and enhance the sealing between the frame and the fan . Tops specification is too large or too vertical hair , not only difficult to assemble , and to make windows mobile resistance increases, especially the larger initial resistance turned on and off in place of resistance. Small size , easy-out vertical tank tops high enough , the enable ( gate ) sealing the window is greatly reduced. Tops subject silicide processing, quality tops look for qualified flat surface , bottom plate and vertical hair smooth. No bending , no pitting on the bottom plate . Bubbles. Hair shaft and the bottom plate bonded firmly and evenly coarseness , hair loss is not easy .
With excellent sealing doors and watertight, that noise it? Natural to players ----- soundproof insulating glass . The two or more than two of the glass , with angled aluminum gutter through the column ( which is filled with desiccant ) intervals around the edges of the glass are marked with butyl rubber, polysulfide rubber ; to form a still ,plastic cable ties dry gas, and vacuum performance. Insulating glass with a variety of superior performance insulation, sealing , frost , dust and noise , etc., so many users are more agreeable . Excellent insulating glass which should be clean, free of dust and moisture .
Good production and installation of windows and doors can not be separated , standard production or not of a high standard windows essential. Production equipment and processes determine the overall performance of windows and doors are excellent . As requested, the difference between the diagonal of plastic doors and windows should be controlled in 2 - 3 mm or less , there is a strict process parameters and control, which requires a certain production equipment and technology to do that have excellent quality workforce . So street workshops and regular manufacturers enamel steel doors just one day of difference. One-third of production, seven installation , if not pay attention to the standard installation of doors and windows can cause distortion . Steel thermal coefficient is almost just six times , so be sure to leave joints between window frames and walls, to prevent thermal expansion and contraction , or minor settlement houses ,security stickers windows and doors so deformed . Meanwhile, to ensure waterproofing , thermal insulation, sound insulation , expansion joints must be filled with an elastic material and then sealed with sealing tape . These materials are more expensive , the quality varies greatly , to prevent cutting corners and shoddy installation .
Installation site on the tops of the doors and windows generally fan, box fan or a seal around the bridge ( wind block ), and enhance the sealing between the frame and the fan . Tops specification is too large or too vertical hair , not only difficult to assemble , and to make windows mobile resistance increases, especially the larger initial resistance turned on and off in place of resistance. Small size , easy-out vertical tank tops high enough , the enable ( gate ) sealing the window is greatly reduced. Tops subject silicide processing, quality tops look for qualified flat surface , bottom plate and vertical hair smooth. No bending , no pitting on the bottom plate . Bubbles. Hair shaft and the bottom plate bonded firmly and evenly coarseness , hair loss is not easy .
With excellent sealing doors and watertight, that noise it? Natural to players ----- soundproof insulating glass . The two or more than two of the glass , with angled aluminum gutter through the column ( which is filled with desiccant ) intervals around the edges of the glass are marked with butyl rubber, polysulfide rubber ; to form a still ,plastic cable ties dry gas, and vacuum performance. Insulating glass with a variety of superior performance insulation, sealing , frost , dust and noise , etc., so many users are more agreeable . Excellent insulating glass which should be clean, free of dust and moisture .
Good production and installation of windows and doors can not be separated , standard production or not of a high standard windows essential. Production equipment and processes determine the overall performance of windows and doors are excellent . As requested, the difference between the diagonal of plastic doors and windows should be controlled in 2 - 3 mm or less , there is a strict process parameters and control, which requires a certain production equipment and technology to do that have excellent quality workforce . So street workshops and regular manufacturers enamel steel doors just one day of difference. One-third of production, seven installation , if not pay attention to the standard installation of doors and windows can cause distortion . Steel thermal coefficient is almost just six times , so be sure to leave joints between window frames and walls, to prevent thermal expansion and contraction , or minor settlement houses ,security stickers windows and doors so deformed . Meanwhile, to ensure waterproofing , thermal insulation, sound insulation , expansion joints must be filled with an elastic material and then sealed with sealing tape . These materials are more expensive , the quality varies greatly , to prevent cutting corners and shoddy installation .
2013年12月9日星期一
Wire seals can be filled for inkjet printers
Using compatible cartridges, is to use good quality compatible cartridges , compatible cartridges not to recommend filling , such as print cartridges compatible with rich colors , and use it as the original cartridge .
Compatible inject ink or compatible cartridges, printer due to the same principle , it can be injected into the compatible ink , just different filling methods. First, buy a bottle of compatible ink . When the computer issuing the low ink warning ( in fact, some of the ink cartridge did not run out ) , open the front cover of the printer , press the button on the printer cartridge , the cartridge stops at the loading position, and then remove the ink directly .
Now introduced several cartridges filling method ( first make sure the nozzle is not blocked ) :
1, CANON Cartridge (BC-01, 02,03), with transparent tape stuck airflow holes and inkjet cartridges mouth , put the cartridge ejector with the original ball is pressed into the cartridge , as shown in the refilling needle insert ball hole , slowly inject the ink , after refilling is complete, with the ejector flatten the ball in the hole , put off the transparent tape with a paper towel to clean the spill ink on the machine .
2, CANON Cartridge (BC-20), pad of paper stuck to confirm refilling inkjet mouth hole location , with a wire hook to seal the top of the cartridge flow hole hook straight plug made of plastic , with transparent tape pasted printheads refilling needle inserted into the hole slowly inject the ink flow , after the completion of the original flow refilling the hole made with a plastic plug flow ejector pressed into the hole on the machine can be used cartridge print head cleaning twice into the printer after , then the self-test results are perfect.
3, CANON Cartridge (BC-05, 06), pad of paper on the table , make sure refilling hole location , with transparent tape pasted paper pad good print head with a wire hook to seal the top of the cartridge flow hole straight hook made of plastic stoppers after the needle is inserted airflow refilling the hole slowly injected ink refilling is completed , the original air flow inside the plastic stoppers made with ejector airflow hole to push the machine.
4, CANON cartridges (BCI-3e, 5e, 6), the ink outlet sealed with a wire seal , label and use the top of the cartridge ejector original ball is pressed into the cartridges, ink injected slowly push open after the hole, refilling is completed, the ball pushed by the ejector port to refill the machine .
5, LEXMARK cartridges (12A1980C), the cartridge label facing up remove the tag to determine the three lines, three lines drilled with a drill press and then match their color ink is slowly added ,adjustable length plastic seals after refilling the hole with a wire to seal shut .
6, LEXMARK cartridges (1145,12 A1970, 17G0050), plus pad of paper with transparent tape pasted nozzles , insert the top of the needle with a refill , then slowly inject the ink about 25ML, after refilling is completed, put off nozzles with a pad of paper , ink-jet with a paper towel and gently wipe the mouth , can be loaded into the printer. Note Before using the cartridge to the printer head cleaning 1-2 times and then self-test .
7, HP ink cartridges (1843, NO.20, 29A, 26A), the injector nozzles connected to the bell from the remaining ink extraction , pumping ink cartridges in the process should be put on the syringe next . Will be coming down to add ink syringe , and then align the ink from top to bottom hole pressure bell even turn ink into the cartridge ( Figure 2 ) , after refilling is completed, the syringe gasped a little , until the cartridge does not leak up to reduce box pressure ( keeping the syringe in the primary process , the next cartridge . then part of a paper towel to wipe the ink nozzles on the machine can be used.
8, HP ink cartridges (C6578C / D, C1823A / D), first make sure the ink hole location , with a wire hook to the plastic ink hole Seti out in accordance with and match the color of the ink slowly added to the proposed use of the plastic plugs refilling the ejector port to push the machine .
9, HP ink cartridges (51625A/51649A)bolt seals, the cartridge label facing up remove the tag to determine the three lines, three lines drilled with a drill press , according to their color matching the ink was added slowly , with a seal to seal the refilling hole .
Compatible inject ink or compatible cartridges, printer due to the same principle , it can be injected into the compatible ink , just different filling methods. First, buy a bottle of compatible ink . When the computer issuing the low ink warning ( in fact, some of the ink cartridge did not run out ) , open the front cover of the printer , press the button on the printer cartridge , the cartridge stops at the loading position, and then remove the ink directly .
Now introduced several cartridges filling method ( first make sure the nozzle is not blocked ) :
1, CANON Cartridge (BC-01, 02,03), with transparent tape stuck airflow holes and inkjet cartridges mouth , put the cartridge ejector with the original ball is pressed into the cartridge , as shown in the refilling needle insert ball hole , slowly inject the ink , after refilling is complete, with the ejector flatten the ball in the hole , put off the transparent tape with a paper towel to clean the spill ink on the machine .
2, CANON Cartridge (BC-20), pad of paper stuck to confirm refilling inkjet mouth hole location , with a wire hook to seal the top of the cartridge flow hole hook straight plug made of plastic , with transparent tape pasted printheads refilling needle inserted into the hole slowly inject the ink flow , after the completion of the original flow refilling the hole made with a plastic plug flow ejector pressed into the hole on the machine can be used cartridge print head cleaning twice into the printer after , then the self-test results are perfect.
3, CANON Cartridge (BC-05, 06), pad of paper on the table , make sure refilling hole location , with transparent tape pasted paper pad good print head with a wire hook to seal the top of the cartridge flow hole straight hook made of plastic stoppers after the needle is inserted airflow refilling the hole slowly injected ink refilling is completed , the original air flow inside the plastic stoppers made with ejector airflow hole to push the machine.
4, CANON cartridges (BCI-3e, 5e, 6), the ink outlet sealed with a wire seal , label and use the top of the cartridge ejector original ball is pressed into the cartridges, ink injected slowly push open after the hole, refilling is completed, the ball pushed by the ejector port to refill the machine .
5, LEXMARK cartridges (12A1980C), the cartridge label facing up remove the tag to determine the three lines, three lines drilled with a drill press and then match their color ink is slowly added ,adjustable length plastic seals after refilling the hole with a wire to seal shut .
6, LEXMARK cartridges (1145,12 A1970, 17G0050), plus pad of paper with transparent tape pasted nozzles , insert the top of the needle with a refill , then slowly inject the ink about 25ML, after refilling is completed, put off nozzles with a pad of paper , ink-jet with a paper towel and gently wipe the mouth , can be loaded into the printer. Note Before using the cartridge to the printer head cleaning 1-2 times and then self-test .
7, HP ink cartridges (1843, NO.20, 29A, 26A), the injector nozzles connected to the bell from the remaining ink extraction , pumping ink cartridges in the process should be put on the syringe next . Will be coming down to add ink syringe , and then align the ink from top to bottom hole pressure bell even turn ink into the cartridge ( Figure 2 ) , after refilling is completed, the syringe gasped a little , until the cartridge does not leak up to reduce box pressure ( keeping the syringe in the primary process , the next cartridge . then part of a paper towel to wipe the ink nozzles on the machine can be used.
8, HP ink cartridges (C6578C / D, C1823A / D), first make sure the ink hole location , with a wire hook to the plastic ink hole Seti out in accordance with and match the color of the ink slowly added to the proposed use of the plastic plugs refilling the ejector port to push the machine .
9, HP ink cartridges (51625A/51649A)bolt seals, the cartridge label facing up remove the tag to determine the three lines, three lines drilled with a drill press , according to their color matching the ink was added slowly , with a seal to seal the refilling hole .
2013年12月2日星期一
To help you choose the wire and cable protection cover reasonable
Issues related to the cable model
1, SYV: solid polyethylene insulation RF coaxial cable
2, SYWV (Y): physical foam polyethylene insulation cable systems cable , video ( RF ) coaxial cable (SYV, SYWV, SYFV) applies to closed-circuit TV surveillance and Engineering
SYWV (Y), SYKV cable TV, broadband network dedicated cable structure: ( coax ) oxygen-free round copper single physical polyethylene foam ( insulation ) ( tin wire aluminum ) PVC (PE )
3, the signal control cable (RVV sheathed cable , RVVP shield ) suitable for building intercom , burglar alarm, fire protection, automatic meter reading and other projects
RVVP: copper core PVC insulated shielded PVC sheathed cable core voltage 300V/300V2-24
Purpose : equipment, instruments,security stickers intercom, monitoring, control installation
4, RG: physical foam polyethylene insulation for coaxial cable access network fiber hybrid network (HFC) analog signals transmitted data
5, KVVP: braided shield PVC sheathed cable uses: signal transmission electrical, instrumentation, power distribution unit , control, measurement
6, RVV (227IEC52/53) PVC insulated flexible cable uses: household appliances, small electric tools , instruments and power lighting
7, AVVR PVC sheathed flexible cable installation
8 , junction box SBVV HYA data communication cables ( indoor and outdoor ) for telephone communications and radio equipment connected to telephone wiring network wiring and use
9, RV, RVP PVC insulated cables
10, RVS, RVB for household appliances, small electric tools, instruments, meters, lighting and power connection cable
11, BV, BVR PVC insulated cables use: apply to electrical instrumentation and dynamic lighting for fixed wiring
12, RIB speaker cable ( fever line )
13, KVV PVC insulated control cable uses: electrical, instrumentation, power distribution unit signal transmission, control, measurement
14, SFTP twisted pair telephone,cable ties data and information network
15, UL2464 computer cable
16, VGA monitor cable
17, SYV coaxial cable wireless communications , broadcasting , surveillance systems engineering, and related electronic equipment to transmit RF signals ( including integrated with coaxial cable )
18, SDFAVP, SDFAVVP, SYFPY coaxial cable, elevator
19, JVPV, JVPVP, JVVP core PVC insulated and sheathed copper wire braided computer control cable
1, SYV: solid polyethylene insulation RF coaxial cable
2, SYWV (Y): physical foam polyethylene insulation cable systems cable , video ( RF ) coaxial cable (SYV, SYWV, SYFV) applies to closed-circuit TV surveillance and Engineering
SYWV (Y), SYKV cable TV, broadband network dedicated cable structure: ( coax ) oxygen-free round copper single physical polyethylene foam ( insulation ) ( tin wire aluminum ) PVC (PE )
3, the signal control cable (RVV sheathed cable , RVVP shield ) suitable for building intercom , burglar alarm, fire protection, automatic meter reading and other projects
RVVP: copper core PVC insulated shielded PVC sheathed cable core voltage 300V/300V2-24
Purpose : equipment, instruments,security stickers intercom, monitoring, control installation
4, RG: physical foam polyethylene insulation for coaxial cable access network fiber hybrid network (HFC) analog signals transmitted data
5, KVVP: braided shield PVC sheathed cable uses: signal transmission electrical, instrumentation, power distribution unit , control, measurement
6, RVV (227IEC52/53) PVC insulated flexible cable uses: household appliances, small electric tools , instruments and power lighting
7, AVVR PVC sheathed flexible cable installation
8 , junction box SBVV HYA data communication cables ( indoor and outdoor ) for telephone communications and radio equipment connected to telephone wiring network wiring and use
9, RV, RVP PVC insulated cables
10, RVS, RVB for household appliances, small electric tools, instruments, meters, lighting and power connection cable
11, BV, BVR PVC insulated cables use: apply to electrical instrumentation and dynamic lighting for fixed wiring
12, RIB speaker cable ( fever line )
13, KVV PVC insulated control cable uses: electrical, instrumentation, power distribution unit signal transmission, control, measurement
14, SFTP twisted pair telephone,cable ties data and information network
15, UL2464 computer cable
16, VGA monitor cable
17, SYV coaxial cable wireless communications , broadcasting , surveillance systems engineering, and related electronic equipment to transmit RF signals ( including integrated with coaxial cable )
18, SDFAVP, SDFAVVP, SYFPY coaxial cable, elevator
19, JVPV, JVPVP, JVVP core PVC insulated and sheathed copper wire braided computer control cable
Installation and maintenance of automotive sealing strip
In the cold winter , the owners will notice whether directly immersed in cold car, occasionally accompanied by wind noise , I feel like the door is not closed tightly same. So this time we have to check the seal it. Airtight seal can be improved to prevent rain from entering the inner compartment . Once the seal breakage aging will cause the car leaks , increasing the car's driving wind noise , leaks and very easy to make body rust. It is not difficult to see , the car , the seal is an important part , the usual maintenance checks must periodically . There are now many professional vehicles sealed shop for different models tailored to exactly match the original car curve slope and curvature of the curve , to ensure continuity between the various body parts to avoid flow separation to produce binding sites , easily resolved periodic tail flow , can reduce wind noise at high speeds , while enhancing the original car 's airtight and dustproof capabilities.
Sealed several key positions
Before installing the glass doors of the vehicle to clear the debris carefully notch within such as mortar , brick dust, wood , etc., should be placed carefully on the glass , ensuring that both sides of the gap is uniform and timely than the positive fixed to prevent collisions shift deviate from the slot center. Rubber seal can not pull too tight , cutting length longer than the assembly length 20-30mm. When installing the mosaic in place, flat surfaces , and glass notch in close contact , so that the glass surrounding the force evenly. In the corner of the rubber should be beveled off and disconnect the injection of glue at the firm . When caulk sealant fixed glass , you should use rubber or rubber block glass and choked , leaving voids plastic injection , plastic injection depth should not be less than 5mm, before the glue curing , the glass should be kept free from vibration.
Vehicle frontier sealed trailing edge and side edge seals: support from the hood, on the hood front, rear and along the side edges of the anastomotic site and the body paste , you can void between the hood and the body effectively sealed vehicles on the way, can accelerate the air from the intake gate through improved thermal performance. At the same time , you can reduce the hood and the front part , the friction between the left and right front fender , reducing noise and friction caused by the bump . If the gap is large, you can paste layers.
Four doors and through the gap between the sealing body , the sealing performance of the vehicle can be effectively improved to reduce wind noise . Improve sealing performance can also prevent dust , rainwater into the cockpit to improve the efficiency of air conditioning and refrigeration . Carefully coated with special glue on the inside of the door , will cut a good seal side also coated with special glue, and then the door inside door seal affixed along the circle .
On the roof around the paste , can effectively improve the seal, dustproof and waterproof ; wrapped pipes for air conditioning and refrigeration , can improve the cooling efficiency. Between the door trim panels and the gap between the dashboard , storage boxes and other interior parts of the car , because the assembly and machining accuracy and other reasons, there is often friction , vehicle process will cause resonance at different speeds generate disturbing noise, which is generally very difficult to find . In fact, know the reason, as long as the seal to fill these gaps , paste.
When the door flange seal repair , the repair should be noted that damage to the sealing flange , the flange accurately recover the original shape . After repairing the door seal to conduct inspection , inspection methods are: put a piece of cardboard in a sealed position, close the door , and then pull the paper , according to the Rally to determine the size of the seal is good. If the force required to pull the paper too much explanation sealed tight , it will affect the normal shut the door , and also due to deformation of the seal over the Omo rapid loss of sealing performance ;bolt seals If the force required to pull the paper through the small , indicating poor seals , often have no doors windshield rain phenomenon. When replacing the door must pay attention to the inner and outer door panels in the new bite at the painted folding plastic cuffs and put some holes left when punching with the base tape blocked .
Note that when the sealing repair in several places
In the rear window glass damage , changing the original window glass with the same curvature of the glass , and glass to check the guides and seals for damage. As the windows after repair often reply less than its original shape , therefore , when in addition to ensure easy pulling or lifting the window glass , but also pay attention to the rear window glass in the windows closed around the seal. If the glass with glass notch uneven gaps , rubber and glass tank exposed, protruding notch glass , hand seals can be easily pulled off .
When changing the roof , the roof should be painted in the periphery of the laminated layer of conductive sealant , to be in the water tank and then weld seams and hems over painted plastic, which not only helps the body sealing , more prevents water body due to flange welds produce early rust.
When replacing the entire body , except for the above projects should be completed , but also on their part and weld lap joints are coated with a layer of sealant layer thickness should be about 1mm, and may not have virtual sticky glue , bubbles and other defects ; should be painted in the fold of the hem special glue ; under the entire floor surface should be coated surface and the front cover under the elastomeric coating and anti-corrosion coating of 3mm-4mm ; these measures can not only greatly enhance the whole sealing and corrosion slows the car body speed , but also can greatly enhance comfort.
Routine maintenance required to put in place
The first is to check whether the automotive sealing large cracks , with or without fracture. If the seal broken or larger cracks can be repaired using an adhesive . Particularly the use of special adhesive seal , it is easy to put up a big crack of good . Of course , if the seal of serious injury , or a greater degree of aging , it is best to replace the new seal easy. Replacing the seal is not difficult , but in order to do a better job , better ask professionals .
Sealing strip routine maintenance work , including the following. The first is the use of the car wash detergent , after the cleaning, coated with a high permeability of the protective agent in order to prevent the aging of the seal . In addition , it is easy to fill up the gap between the dust seal , causing corrosion. For this reason , you should use a brush to remove dust and other clean.
Doors and windows sealing strip is an important part of effective measures to ensure that it is airtight doors , watertight , sound , etc., but it is also a reliable guarantee of glass in windows and doors after by external security presence . Since the seal affected by climate and sunlight produces contraction, aging, deformation , and therefore ,colored cable ties the sealing strip is not allowed to work under tension , should remain in the free state . In order to firmly stuck to the glass , the installation process will tend to pull too tight seal , can not guarantee a free state , so that in the tensile deformation state. Practice has proved that , due to the seal installed in tensile deformation state, has emerged seal off, pull off , cracks and other phenomena . For this reason , during installation, the length of the seal assembly of doors side than the more , the slope at the corner is turned off, the adhesive stick firmly , allow sufficient telescoping margin.
Sealed several key positions
Before installing the glass doors of the vehicle to clear the debris carefully notch within such as mortar , brick dust, wood , etc., should be placed carefully on the glass , ensuring that both sides of the gap is uniform and timely than the positive fixed to prevent collisions shift deviate from the slot center. Rubber seal can not pull too tight , cutting length longer than the assembly length 20-30mm. When installing the mosaic in place, flat surfaces , and glass notch in close contact , so that the glass surrounding the force evenly. In the corner of the rubber should be beveled off and disconnect the injection of glue at the firm . When caulk sealant fixed glass , you should use rubber or rubber block glass and choked , leaving voids plastic injection , plastic injection depth should not be less than 5mm, before the glue curing , the glass should be kept free from vibration.
Vehicle frontier sealed trailing edge and side edge seals: support from the hood, on the hood front, rear and along the side edges of the anastomotic site and the body paste , you can void between the hood and the body effectively sealed vehicles on the way, can accelerate the air from the intake gate through improved thermal performance. At the same time , you can reduce the hood and the front part , the friction between the left and right front fender , reducing noise and friction caused by the bump . If the gap is large, you can paste layers.
Four doors and through the gap between the sealing body , the sealing performance of the vehicle can be effectively improved to reduce wind noise . Improve sealing performance can also prevent dust , rainwater into the cockpit to improve the efficiency of air conditioning and refrigeration . Carefully coated with special glue on the inside of the door , will cut a good seal side also coated with special glue, and then the door inside door seal affixed along the circle .
On the roof around the paste , can effectively improve the seal, dustproof and waterproof ; wrapped pipes for air conditioning and refrigeration , can improve the cooling efficiency. Between the door trim panels and the gap between the dashboard , storage boxes and other interior parts of the car , because the assembly and machining accuracy and other reasons, there is often friction , vehicle process will cause resonance at different speeds generate disturbing noise, which is generally very difficult to find . In fact, know the reason, as long as the seal to fill these gaps , paste.
When the door flange seal repair , the repair should be noted that damage to the sealing flange , the flange accurately recover the original shape . After repairing the door seal to conduct inspection , inspection methods are: put a piece of cardboard in a sealed position, close the door , and then pull the paper , according to the Rally to determine the size of the seal is good. If the force required to pull the paper too much explanation sealed tight , it will affect the normal shut the door , and also due to deformation of the seal over the Omo rapid loss of sealing performance ;bolt seals If the force required to pull the paper through the small , indicating poor seals , often have no doors windshield rain phenomenon. When replacing the door must pay attention to the inner and outer door panels in the new bite at the painted folding plastic cuffs and put some holes left when punching with the base tape blocked .
Note that when the sealing repair in several places
In the rear window glass damage , changing the original window glass with the same curvature of the glass , and glass to check the guides and seals for damage. As the windows after repair often reply less than its original shape , therefore , when in addition to ensure easy pulling or lifting the window glass , but also pay attention to the rear window glass in the windows closed around the seal. If the glass with glass notch uneven gaps , rubber and glass tank exposed, protruding notch glass , hand seals can be easily pulled off .
When changing the roof , the roof should be painted in the periphery of the laminated layer of conductive sealant , to be in the water tank and then weld seams and hems over painted plastic, which not only helps the body sealing , more prevents water body due to flange welds produce early rust.
When replacing the entire body , except for the above projects should be completed , but also on their part and weld lap joints are coated with a layer of sealant layer thickness should be about 1mm, and may not have virtual sticky glue , bubbles and other defects ; should be painted in the fold of the hem special glue ; under the entire floor surface should be coated surface and the front cover under the elastomeric coating and anti-corrosion coating of 3mm-4mm ; these measures can not only greatly enhance the whole sealing and corrosion slows the car body speed , but also can greatly enhance comfort.
Routine maintenance required to put in place
The first is to check whether the automotive sealing large cracks , with or without fracture. If the seal broken or larger cracks can be repaired using an adhesive . Particularly the use of special adhesive seal , it is easy to put up a big crack of good . Of course , if the seal of serious injury , or a greater degree of aging , it is best to replace the new seal easy. Replacing the seal is not difficult , but in order to do a better job , better ask professionals .
Sealing strip routine maintenance work , including the following. The first is the use of the car wash detergent , after the cleaning, coated with a high permeability of the protective agent in order to prevent the aging of the seal . In addition , it is easy to fill up the gap between the dust seal , causing corrosion. For this reason , you should use a brush to remove dust and other clean.
Doors and windows sealing strip is an important part of effective measures to ensure that it is airtight doors , watertight , sound , etc., but it is also a reliable guarantee of glass in windows and doors after by external security presence . Since the seal affected by climate and sunlight produces contraction, aging, deformation , and therefore ,colored cable ties the sealing strip is not allowed to work under tension , should remain in the free state . In order to firmly stuck to the glass , the installation process will tend to pull too tight seal , can not guarantee a free state , so that in the tensile deformation state. Practice has proved that , due to the seal installed in tensile deformation state, has emerged seal off, pull off , cracks and other phenomena . For this reason , during installation, the length of the seal assembly of doors side than the more , the slope at the corner is turned off, the adhesive stick firmly , allow sufficient telescoping margin.
2013年11月22日星期五
Dry gas seals used in the centrifuge
Improvement of the mechanical seal
Centrifuge traditional mechanical seals, mechanical seals are the advantages of simple structure, mature technology, machining accuracy is not required; drawback is that life is short, power consumption, there must be a liquid medium to lubricate and cool the sealing surface, the production process parameter fluctuations great seal. Since the operation centrifuges, mechanical seal life has been very short, only five months longest, replace the mechanical seal needs 28h, seriously affecting production. And after the mechanical seal (referred mechanical seal) failure is leaking liquid hexane, hexane is flammable, explosive media, not only the existence of a significant security risk, but also caused serious pollution to the environment. Based on this, we decided to change it to dry gas seal, to enhance economic efficiency and eliminate security risks. Dry gas seal is the most advanced form of a non-contact seal, mainly by the rotating ring, stationary ring, ring, spring, spring seat and sleeve components.
After rotating ring sealing surface grinding and polishing process, and the processed fluid at the dynamic pressure grooves, Figure 2. Dry gas seals rotary ring is rotated, the dynamic pressure of the sealing gas is sucked into the tank, the throttling effect of the sealing weir, into the sealing surface of the gas is compressed under the action of the gas pressure, the sealing surface is open, the gas flow forming a thin gas film between the two sealing surfaces and a thickness of 3 ~ 5um,high security cable seals when the reaction force together with aerostatic air film and the formation of the spring force is equal to the thickness of the air film is very stable, thus ensuring the seal reliability.
We analyze the structure of the centrifuge, decided not to change the device structure, the use of double-end dry gas seal, the same size as the original seal size, and a similar structure, easy to install, see Figure 3. Taking into account the process medium plastic powder, using hexane for cleaning sealed chamber for cleaning. Dynamic pressure dry gas seal ring groove machined end face, using tungsten carbide ring (WC) material, which has a high surface hardness, wear resistance, thermal conductivity coefficient, etc.; static ring using impregnated graphite material, which has high strength, good lubricating properties and high temperature, etc. from.
Seal gas is nitrogen, provided by external network, the maximum pressure is 0.7MPa, the normal operating pressure of 0.5-0.6MPa, the minimum pressure of 0.4MPa, the nitrogen flow is greater than l0 standard m3 / h.
0.7MPa nitrogen is passed through the filtration unit under reduced pressure to 0.5 MPa, into the sealed chamber through a flow meter. To prevent the pipe network in the nitrogen pressure fluctuations for emergency spare bottle with nitrogen gas source, alternate air source can supply 2h. Dry gas seal leakage from the flow meter showed normal operation, the nitrogen leak kept within a stable range,identification cable ties if the leakage continues to increase, the seal chamber pressure will drop, when the pressure drops Bian 0.3MPa, interlock parking to Centrifuge ensure safety. From the actual operation situation, the nitrogen pressure in the 0.5MPa, to ensure the good functioning at this time, nitrogen consumption was 0.48 standard m3 / h, less than the design of a standard m3 / h.
Centrifuge traditional mechanical seals, mechanical seals are the advantages of simple structure, mature technology, machining accuracy is not required; drawback is that life is short, power consumption, there must be a liquid medium to lubricate and cool the sealing surface, the production process parameter fluctuations great seal. Since the operation centrifuges, mechanical seal life has been very short, only five months longest, replace the mechanical seal needs 28h, seriously affecting production. And after the mechanical seal (referred mechanical seal) failure is leaking liquid hexane, hexane is flammable, explosive media, not only the existence of a significant security risk, but also caused serious pollution to the environment. Based on this, we decided to change it to dry gas seal, to enhance economic efficiency and eliminate security risks. Dry gas seal is the most advanced form of a non-contact seal, mainly by the rotating ring, stationary ring, ring, spring, spring seat and sleeve components.
After rotating ring sealing surface grinding and polishing process, and the processed fluid at the dynamic pressure grooves, Figure 2. Dry gas seals rotary ring is rotated, the dynamic pressure of the sealing gas is sucked into the tank, the throttling effect of the sealing weir, into the sealing surface of the gas is compressed under the action of the gas pressure, the sealing surface is open, the gas flow forming a thin gas film between the two sealing surfaces and a thickness of 3 ~ 5um,high security cable seals when the reaction force together with aerostatic air film and the formation of the spring force is equal to the thickness of the air film is very stable, thus ensuring the seal reliability.
We analyze the structure of the centrifuge, decided not to change the device structure, the use of double-end dry gas seal, the same size as the original seal size, and a similar structure, easy to install, see Figure 3. Taking into account the process medium plastic powder, using hexane for cleaning sealed chamber for cleaning. Dynamic pressure dry gas seal ring groove machined end face, using tungsten carbide ring (WC) material, which has a high surface hardness, wear resistance, thermal conductivity coefficient, etc.; static ring using impregnated graphite material, which has high strength, good lubricating properties and high temperature, etc. from.
Seal gas is nitrogen, provided by external network, the maximum pressure is 0.7MPa, the normal operating pressure of 0.5-0.6MPa, the minimum pressure of 0.4MPa, the nitrogen flow is greater than l0 standard m3 / h.
0.7MPa nitrogen is passed through the filtration unit under reduced pressure to 0.5 MPa, into the sealed chamber through a flow meter. To prevent the pipe network in the nitrogen pressure fluctuations for emergency spare bottle with nitrogen gas source, alternate air source can supply 2h. Dry gas seal leakage from the flow meter showed normal operation, the nitrogen leak kept within a stable range,identification cable ties if the leakage continues to increase, the seal chamber pressure will drop, when the pressure drops Bian 0.3MPa, interlock parking to Centrifuge ensure safety. From the actual operation situation, the nitrogen pressure in the 0.5MPa, to ensure the good functioning at this time, nitrogen consumption was 0.48 standard m3 / h, less than the design of a standard m3 / h.
Mechanical seal failure to take measures to deal with
If the mechanical seal parts fails, you need to replace parts or increase machining precision parts, precision mechanical seals to improve the precision and the pump itself, other components of the mechanical seal is very favorable. In order to improve the sealing effect of the movement of the ring and the friction surface finish roughness higher. Width of the friction surface of the ring movement is not, generally between 2 to 7 mm.
Mechanical seal vibration, heat treatment
If the gap between the sealing ring and the movement of the small chamber, the inner diameter of seal chamber should increase or decrease the outer diameter of rotation, a gap of at least 0.75mm guaranteed. If the friction pair is improper, it is necessary to change the static ring material to temperature, corrosion resistance. This will reduce the mechanical vibration and heat sealed.
Handling mechanical seal leakage
Mechanical seal leakage is due to a variety of causes, we have to deal with specific issues. In order to minimize the amount of leakage, must be strictly in accordance with the technical requirements for the installation of mechanical seal assembly, but also pay attention to the following matters.
(1) assembly to be clean and smooth. Mechanical seal parts, tools, lubricants, wiping material to be very clean. Movement ring seal face use a soft gauze wipe. (2) trimming chamfer rounding. Shaft seal cover, such as chamfers to trim and smooth, rounded shaft and cover related to sanding polish. (3) secondary seal assembly, the auxiliary seal rubber gasoline, kerosene can not be soaked and washed to avoid swelling deformation,bolt security seal premature aging. After the static ring assembly, hand pressed compensation loop, checking is in place, is flexible; elastic snap ring is positioned reliable. Ring is installed, you must ensure that it is flexible shaft axial movement.
Shaft channeling large processing
Rational design of axial force balance device, eliminating axial channeling. To meet this requirement, the multi-stage centrifugal pumps, design options are: balance disc plus axial thrust bearing, the balance disc balance the axial force, the axial thrust bearing on the shaft axial limit.
Adding auxiliary flushing system
Seal chamber sealing medium containing particles, impurities must be flushed, because otherwise the precipitated crystals, particles, deposition of impurities, the mechanical seal spring failure, if the particles entering the friction will cause rapid destruction of the mechanical seal. Therefore, secondary mechanical seal flush system is very important, it can effectively protect the sealing surface, played cooling, lubrication, wash away debris and so on.
Pump vibration treatment measures
In the manufacturing assembly process pump products in strict accordance with the standards and procedures to perform, to eliminate vibration source. Pumps, motors, chassis, piping and other auxiliary equipment on site during on-site installation, to strictly eliminate vibration source.
Studied more than simple mechanical seals on rotating equipment applications and emerging fault,metal seals later encountered mechanical seal failure problems, we must first consider the impact factors of mechanical seals itself, and then also consider some factors outside of the mechanical seal. For example: In analyzing the causes of the accident quality mechanical seal, taking into account the impact on other parts of the pump mechanical seal operation, take measures to continuously improve the mechanical seal effect.
Mechanical seal vibration, heat treatment
If the gap between the sealing ring and the movement of the small chamber, the inner diameter of seal chamber should increase or decrease the outer diameter of rotation, a gap of at least 0.75mm guaranteed. If the friction pair is improper, it is necessary to change the static ring material to temperature, corrosion resistance. This will reduce the mechanical vibration and heat sealed.
Handling mechanical seal leakage
Mechanical seal leakage is due to a variety of causes, we have to deal with specific issues. In order to minimize the amount of leakage, must be strictly in accordance with the technical requirements for the installation of mechanical seal assembly, but also pay attention to the following matters.
(1) assembly to be clean and smooth. Mechanical seal parts, tools, lubricants, wiping material to be very clean. Movement ring seal face use a soft gauze wipe. (2) trimming chamfer rounding. Shaft seal cover, such as chamfers to trim and smooth, rounded shaft and cover related to sanding polish. (3) secondary seal assembly, the auxiliary seal rubber gasoline, kerosene can not be soaked and washed to avoid swelling deformation,bolt security seal premature aging. After the static ring assembly, hand pressed compensation loop, checking is in place, is flexible; elastic snap ring is positioned reliable. Ring is installed, you must ensure that it is flexible shaft axial movement.
Shaft channeling large processing
Rational design of axial force balance device, eliminating axial channeling. To meet this requirement, the multi-stage centrifugal pumps, design options are: balance disc plus axial thrust bearing, the balance disc balance the axial force, the axial thrust bearing on the shaft axial limit.
Adding auxiliary flushing system
Seal chamber sealing medium containing particles, impurities must be flushed, because otherwise the precipitated crystals, particles, deposition of impurities, the mechanical seal spring failure, if the particles entering the friction will cause rapid destruction of the mechanical seal. Therefore, secondary mechanical seal flush system is very important, it can effectively protect the sealing surface, played cooling, lubrication, wash away debris and so on.
Pump vibration treatment measures
In the manufacturing assembly process pump products in strict accordance with the standards and procedures to perform, to eliminate vibration source. Pumps, motors, chassis, piping and other auxiliary equipment on site during on-site installation, to strictly eliminate vibration source.
Studied more than simple mechanical seals on rotating equipment applications and emerging fault,metal seals later encountered mechanical seal failure problems, we must first consider the impact factors of mechanical seals itself, and then also consider some factors outside of the mechanical seal. For example: In analyzing the causes of the accident quality mechanical seal, taking into account the impact on other parts of the pump mechanical seal operation, take measures to continuously improve the mechanical seal effect.
2013年11月5日星期二
Mechanical seals are the primary method of modern shaft seal
Modern shaft seal mechanical seal is the main method, though use of it is not easy to achieve completely leak, but the reach of tiny, it is perfectly acceptable amount of leakage is entirely possible. However, the operation of the pump, but often embarrassing situation, then the mechanical seal failure because what is it?
1, the mechanical seal material selection inappropriate. Mechanical seal material and the transmission medium does not match. In operation, the sealing element will soon be corrosion, dissolution or wear, thus losing the sealing capability. Therefore, according to the nature of the transmission medium and the choice of the mechanical seal material is to ensure its sealing function and the normal life of the prerequisites.
2, the mechanical seal flush condition does not meet the design requirements. In conveying easy to crystallize or fine particles of the medium, there must be a certain pressure and a certain flow of fluid to wash, or their crystals or particles will accelerate the sealing wear and affect the sealing of worn automatic compensation leak. Therefore, according to the nature of the transmission medium not only to configure the appropriate flushing lines, but also to install a monitoring and regulation instruments and devices to ensure that fluid pressure and flow to meet the design requirements, in order to maintain the normal operation of the mechanical black cable ties, which is often overlooked by users.
3, each of the mechanical seal can withstand the pressure is limited, due to the seal chamber pressure measurement are not allowed, resulting in the seal chamber pressure exceeds the mechanical seal can withstand the pressure of the leak, is a common sealing One reason for failure.
4, the mechanical seal operating temperature can not exceed the specified value. In the design of a cooling circuit, often due to insufficient flow of the cooling medium leaving the cooling effect is reduced; without the cooling circuit design, the seal cavity often as harbored in the air and cause mechanical seal dry friction condition. In both cases, the movement of the mechanical seal sealing temperature is too high and accelerated wear, resulting in seal failure.
5, the use of a single spring mechanical seals ignored when spring pump rotor rotation direction and the direction of rotation correct combination also occurs. Or design without instructions or assembly negligence, failed to do so because of the rotation of the rotor mechanical seal leaving but on the contrary increase the spring force, resulting in the ring and stationary ring friction pairs formed insufficient pressure leak.
6, bearing severe wear or damage, so that axial movement of the shaft produce severe, but also one of the reasons mechanical seal leakage. With the scientific and technological development, new marker cable ties and sealing materials, emerging forms, which is bound to the pump seal technology have a direct impact and promoted. Long life, zero leakage pump products in a growing number of occasions to get promotion and application.
1, the mechanical seal material selection inappropriate. Mechanical seal material and the transmission medium does not match. In operation, the sealing element will soon be corrosion, dissolution or wear, thus losing the sealing capability. Therefore, according to the nature of the transmission medium and the choice of the mechanical seal material is to ensure its sealing function and the normal life of the prerequisites.
2, the mechanical seal flush condition does not meet the design requirements. In conveying easy to crystallize or fine particles of the medium, there must be a certain pressure and a certain flow of fluid to wash, or their crystals or particles will accelerate the sealing wear and affect the sealing of worn automatic compensation leak. Therefore, according to the nature of the transmission medium not only to configure the appropriate flushing lines, but also to install a monitoring and regulation instruments and devices to ensure that fluid pressure and flow to meet the design requirements, in order to maintain the normal operation of the mechanical black cable ties, which is often overlooked by users.
3, each of the mechanical seal can withstand the pressure is limited, due to the seal chamber pressure measurement are not allowed, resulting in the seal chamber pressure exceeds the mechanical seal can withstand the pressure of the leak, is a common sealing One reason for failure.
4, the mechanical seal operating temperature can not exceed the specified value. In the design of a cooling circuit, often due to insufficient flow of the cooling medium leaving the cooling effect is reduced; without the cooling circuit design, the seal cavity often as harbored in the air and cause mechanical seal dry friction condition. In both cases, the movement of the mechanical seal sealing temperature is too high and accelerated wear, resulting in seal failure.
5, the use of a single spring mechanical seals ignored when spring pump rotor rotation direction and the direction of rotation correct combination also occurs. Or design without instructions or assembly negligence, failed to do so because of the rotation of the rotor mechanical seal leaving but on the contrary increase the spring force, resulting in the ring and stationary ring friction pairs formed insufficient pressure leak.
6, bearing severe wear or damage, so that axial movement of the shaft produce severe, but also one of the reasons mechanical seal leakage. With the scientific and technological development, new marker cable ties and sealing materials, emerging forms, which is bound to the pump seal technology have a direct impact and promoted. Long life, zero leakage pump products in a growing number of occasions to get promotion and application.
2013年11月1日星期五
Gasket leaks cause analysis
The gasket leakage :
General gasket leaks , there are four forms: interface leak , leak penetration , diffusion leaks, damage leak.
Penetration leak: soft gasket material because the material is mostly fiber, easy to dip appropriate media , in particular pressure . tie wraps Due to capillary phenomenon, the medium will penetrate into the low pressure side to form infiltration.
Interface Leak : The interface is not as gasket compression flange surface finish combined with improper flange deformation etc will leak in the sealed interface . For interface World leakage , the use of padded material can be clamped against the flange surface .
Destruction Leakage: sealing parts relatively poor working conditions , thermal deformation, often affected by vibration, shock , improper installation , fastening force is too large , used repeatedly , deformation , stress concentration, fatigue strength and damage than the material aging , deterioration etc will cause damage leak. This leakage causes the greatest impact hazard is also large , to strengthen prevention.
Diffusion Leakage: poor concentration , driven by the media or by sealing the gap sealing material produced by mass transfer and capillary leak . Diffusion is the result of molecular motion , and not one-way. Minimal pressure or vacuum in a sealed state , or sealed nitrogen, high security seal hydrogen and other permeable substances, as well as highly toxic , radioactive substances should pay special attention penetration and proliferation of two kinds of leaks.
General gasket leaks , there are four forms: interface leak , leak penetration , diffusion leaks, damage leak.
Penetration leak: soft gasket material because the material is mostly fiber, easy to dip appropriate media , in particular pressure . tie wraps Due to capillary phenomenon, the medium will penetrate into the low pressure side to form infiltration.
Interface Leak : The interface is not as gasket compression flange surface finish combined with improper flange deformation etc will leak in the sealed interface . For interface World leakage , the use of padded material can be clamped against the flange surface .
Destruction Leakage: sealing parts relatively poor working conditions , thermal deformation, often affected by vibration, shock , improper installation , fastening force is too large , used repeatedly , deformation , stress concentration, fatigue strength and damage than the material aging , deterioration etc will cause damage leak. This leakage causes the greatest impact hazard is also large , to strengthen prevention.
Diffusion Leakage: poor concentration , driven by the media or by sealing the gap sealing material produced by mass transfer and capillary leak . Diffusion is the result of molecular motion , and not one-way. Minimal pressure or vacuum in a sealed state , or sealed nitrogen, high security seal hydrogen and other permeable substances, as well as highly toxic , radioactive substances should pay special attention penetration and proliferation of two kinds of leaks.
2013年10月28日星期一
Currently on the market often posing Corner There are three types of plastic glue
Strength aluminum alloy doors and sealing the corners of aluminum doors and windows as long as the use of special glue to set angle, but unfortunately most of the windows and doors factory and developers, as well as related administrative departments architectural design, supervision and other units did not really recognize the special Corner plastic windows and doors in improving the overall quality of the important role. Some assembly plant doors and windows do not use glue or wrongly Corner glass adhesive, structural adhesive, such as epoxy glue aluminum doors and windows dedicated Corner glue in use. Currently on the market often posing Corner adhesive glue into three categories:
1, glass, plastic, also known as silicone sealant; poor adhesion on aluminum, poor weather, easy to aging, low hardness, elasticity is too large, curing gel does not swell, can not make the corner yard stick closely with the cavity then become one.
2, structural adhesive for bonding aluminum poor, long curing time, products and more smell, does not swell when cured, can not produce high strength.
3, after curing epoxy adhesive inelastic, unable to adapt to the form of microseismic, easy crisp and broken, Corner after long-term strength is not enough, will produce cracking, dregs phenomenon.
Why do we have to use a dedicated advocate Corner gum? Because of special aluminum alloy doors and windows Corner glue has the following characteristics:
1, colloids are modified polyurethane-based adhesives, solvent-free, in line with environmental requirements.
2, initial curing time is short, about 10 minutes, will help improve production efficiency. Divided into single, two-component two kinds, more suitable for "Corner glue and corner connectors dispensing whole" two kinds of process requirements.
3, high hardness after curing, but not brittle, with low elasticity and excellent waterproof performance, so that angle code and section ductile adhesive wall connections, which make up, various parts of the corner of the window to reduce deformation, cracking conditions an effective solution to the problem of leakage corner windows and doors.
4, one-component adhesive glue is completely cured Corner, Corner profiles cavity with an effective part of the shear strength of the adhesive can be achieved 10.3N/MM2, component Corner Shear strength can reach 18N/MM2, greatly enhanced strength corner of the window. That is, ordinary 60 series of profiles of the shear strength can exceed Cutaway.
5, colloidal slightly foaming during the curing process, expanded, forming metal to metal between the elastic pad, the effective transmission of forces weaken, play a shock, the cushion effect.
6, weather resistance, the ability of -40 ° C +80 ° C temperature variation, white or translucent gel, the gel will not play in the short yellow. Corner two-component glue in 230 ° C high temperature tolerance of 30 minutes, suitable for powder coating and other post-processing needs.
7, with special cleaning agent with a small amount of excess glue is easy to clean,Fixed Length plastic seals will not harm the surface profile of the coating and paint, environmental non-toxic.
The author believes that the current market a lot to promote the use of the German "Wei Shi" series Corner combination of gum and related ancillary products, aluminum doors and windows corner for structural reinforcement and sealed professionally designed to meet the requirements of various groups angle is aluminum door and window factory and the developers of the most sensible choice.
1, glass, plastic, also known as silicone sealant; poor adhesion on aluminum, poor weather, easy to aging, low hardness, elasticity is too large, curing gel does not swell, can not make the corner yard stick closely with the cavity then become one.
2, structural adhesive for bonding aluminum poor, long curing time, products and more smell, does not swell when cured, can not produce high strength.
3, after curing epoxy adhesive inelastic, unable to adapt to the form of microseismic, easy crisp and broken, Corner after long-term strength is not enough, will produce cracking, dregs phenomenon.
Why do we have to use a dedicated advocate Corner gum? Because of special aluminum alloy doors and windows Corner glue has the following characteristics:
1, colloids are modified polyurethane-based adhesives, solvent-free, in line with environmental requirements.
2, initial curing time is short, about 10 minutes, will help improve production efficiency. Divided into single, two-component two kinds, more suitable for "Corner glue and corner connectors dispensing whole" two kinds of process requirements.
3, high hardness after curing, but not brittle, with low elasticity and excellent waterproof performance, so that angle code and section ductile adhesive wall connections, which make up, various parts of the corner of the window to reduce deformation, cracking conditions an effective solution to the problem of leakage corner windows and doors.
4, one-component adhesive glue is completely cured Corner, Corner profiles cavity with an effective part of the shear strength of the adhesive can be achieved 10.3N/MM2, component Corner Shear strength can reach 18N/MM2, greatly enhanced strength corner of the window. That is, ordinary 60 series of profiles of the shear strength can exceed Cutaway.
5, colloidal slightly foaming during the curing process, expanded, forming metal to metal between the elastic pad, the effective transmission of forces weaken, play a shock, the cushion effect.
6, weather resistance, the ability of -40 ° C +80 ° C temperature variation, white or translucent gel, the gel will not play in the short yellow. Corner two-component glue in 230 ° C high temperature tolerance of 30 minutes, suitable for powder coating and other post-processing needs.
7, with special cleaning agent with a small amount of excess glue is easy to clean,Fixed Length plastic seals will not harm the surface profile of the coating and paint, environmental non-toxic.
The author believes that the current market a lot to promote the use of the German "Wei Shi" series Corner combination of gum and related ancillary products, aluminum doors and windows corner for structural reinforcement and sealed professionally designed to meet the requirements of various groups angle is aluminum door and window factory and the developers of the most sensible choice.
2013年10月23日星期三
Heat pump mechanical seal Precautions
Heat pump according to the conditions of use of the different installation of different forms of mechanical seals , such as the built-in single-ended flat horizontal and non- balanced ,high security cable seals double-end balanced and unbalanced type , externally mounted mechanical seals , etc. Therefore , according to the choice of seals in different forms, its using methods and precautions are also different, generally have the following specific conditions :
1, the general mechanical seal suitable for cleaning medium without suspended particles , on the newly installed piping system should be carefully cleaned reservoir together to prevent solid impurities into the mechanical seal faces .
2, in the crystallization medium using mechanical seals , attention should be cleaned regularly , before the restart after stopping to get crystal mechanical seal clean .
3 , the mechanical seal should be carefully disassemble , prohibited by hand cone, iron and other percussion . Demolition should be clear dirt.
4 , strict inspection ring and the stationary ring for face grinding , does not allow any minor scratches, Pengpo other defects.
5 , the right to adjust the amount of compression springs , making it an appropriate degree of tightness to avoid excessive wear or leakage.
6, there is an external mechanical seal flush , start should be preceded by open cavity filled with fluid sealing liquid is sealed ,adjustable length plastic seals stopping when the first stop the pump, close the seal flush fluid.
1, the general mechanical seal suitable for cleaning medium without suspended particles , on the newly installed piping system should be carefully cleaned reservoir together to prevent solid impurities into the mechanical seal faces .
2, in the crystallization medium using mechanical seals , attention should be cleaned regularly , before the restart after stopping to get crystal mechanical seal clean .
3 , the mechanical seal should be carefully disassemble , prohibited by hand cone, iron and other percussion . Demolition should be clear dirt.
4 , strict inspection ring and the stationary ring for face grinding , does not allow any minor scratches, Pengpo other defects.
5 , the right to adjust the amount of compression springs , making it an appropriate degree of tightness to avoid excessive wear or leakage.
6, there is an external mechanical seal flush , start should be preceded by open cavity filled with fluid sealing liquid is sealed ,adjustable length plastic seals stopping when the first stop the pump, close the seal flush fluid.
2013年10月11日星期五
Gear pump hydraulic system development
In order to adapt hydraulic system is toward fast response , small size, low noise direction, gear pumps in addition to actively take measures to maintain its low-pressure dosing system , lubrication system dominance , but still need the following directions:
( 1 ) low flow pulsation : flow pulsation will cause pressure fluctuations , causing the system to generate vibration and noise, which is associated with the requirements of modern hydraulic systems are inconsistent . Reduce flow pulsation method , in addition to the previously described measures, Saikawa complex multi- gear pump is a trend.
( 2 ) high-voltage technology : higher pressure is required by the system , but also gear pumps and piston pumps, vane pumps competition must be addressed . The high pressure gear pump of the work has made great progress , but by its own structural limitations , in order to further improve the working pressure is very difficult to be developed a new structure of the gear pump . In this regard, by a plurality of composite gear pump gear will have a great advantage, the country has many researchers has conducted some research, and achieved remarkable results pull tight plastic seals.
( 3 ) Low noise: abroad have long been "quiet" pump said. As people's awareness of environmental protection , the gear pump noise requirements have become more stringent. Gear pump noise is mainly composed of two parts , part of the process of meshing gear mechanical noise generated in the other part of the trapped oil hydraulic pressure generated by the impact of noise. The former gear precision machining and installation , while the latter mainly depends on the thoroughness of the pump unloading . For external gear pump , to achieve complete unloading is very difficult, thus further reducing pump noise subject to certain restrictions . In this regard, due to internal gear pump has a smooth , non- trapped oil phenomenon , low noise characteristics and attracted universal attention , especially linear conjugate tooth profile of the internal gear pump because of its smooth operation, low noise, and much favor , is becoming the focus of research .
( 4 ) Variable Displacement: gear pump displacement can not be adjusted , limiting its scope to use the same . In order to change the gear pump displacement , domestic and foreign scholars have done a lot of research work, and made a lot of research results. For variable displacement gear pump has a lot of aspects of the patent , but really very little can be converted into products . Balanced compound gear internal gear pump can be adjusted by changing the speed of the pump displacement meters , but the specific methods and structures to be studied further tamper seal.
( 5 ) Large displacement : For some systems require fast moving rice , said large displacement is required. But conventional gear pump displacement increased by many factors. This regard , balanced compound gear pump has significant advantages , such as a table three composite idler gear pump displacement equivalent to 6 units with a single pump displacement dimensions .
( 1 ) low flow pulsation : flow pulsation will cause pressure fluctuations , causing the system to generate vibration and noise, which is associated with the requirements of modern hydraulic systems are inconsistent . Reduce flow pulsation method , in addition to the previously described measures, Saikawa complex multi- gear pump is a trend.
( 2 ) high-voltage technology : higher pressure is required by the system , but also gear pumps and piston pumps, vane pumps competition must be addressed . The high pressure gear pump of the work has made great progress , but by its own structural limitations , in order to further improve the working pressure is very difficult to be developed a new structure of the gear pump . In this regard, by a plurality of composite gear pump gear will have a great advantage, the country has many researchers has conducted some research, and achieved remarkable results pull tight plastic seals.
( 3 ) Low noise: abroad have long been "quiet" pump said. As people's awareness of environmental protection , the gear pump noise requirements have become more stringent. Gear pump noise is mainly composed of two parts , part of the process of meshing gear mechanical noise generated in the other part of the trapped oil hydraulic pressure generated by the impact of noise. The former gear precision machining and installation , while the latter mainly depends on the thoroughness of the pump unloading . For external gear pump , to achieve complete unloading is very difficult, thus further reducing pump noise subject to certain restrictions . In this regard, due to internal gear pump has a smooth , non- trapped oil phenomenon , low noise characteristics and attracted universal attention , especially linear conjugate tooth profile of the internal gear pump because of its smooth operation, low noise, and much favor , is becoming the focus of research .
( 4 ) Variable Displacement: gear pump displacement can not be adjusted , limiting its scope to use the same . In order to change the gear pump displacement , domestic and foreign scholars have done a lot of research work, and made a lot of research results. For variable displacement gear pump has a lot of aspects of the patent , but really very little can be converted into products . Balanced compound gear internal gear pump can be adjusted by changing the speed of the pump displacement meters , but the specific methods and structures to be studied further tamper seal.
( 5 ) Large displacement : For some systems require fast moving rice , said large displacement is required. But conventional gear pump displacement increased by many factors. This regard , balanced compound gear pump has significant advantages , such as a table three composite idler gear pump displacement equivalent to 6 units with a single pump displacement dimensions .
2013年10月8日星期二
Thread sealing
Thread seal on the pump, there are two ways , one is threaded coupling gasket seal , one is filled with economy plus thread sealing , Both small diameter threaded connections for sealing applications . Threaded coupling gasket sealing gasket seals are , but only as provided threaded clamping force. In addition to the sealing effect of the gasket outside its performance . The roughness of the sealing surface relative to the threaded hole of the sealing effect of the geometric positional accuracy of great impact .rail car seals The gasket is tightened by a screw not only withstand the pressing force , the torque is also exposed , the spacer is deformed or damaged , so that when the gasket is non-metallic , generally apply only where the pressure is not high , if the spacer metal above apply pressure up to 30Mpa .
Pump plugs frequently used , is another form of thread sealing . Taking into account the manufacturing economy plugs , generally can not play alone with threaded seal, often with raw tape, sealant fillers for thread sealing gap . Its bearing capacity depends on thread manufacturing precision and material, with plugs and threaded hole with the form does not matter. Threaded holes with plugs either a " cone on cone" or " columns on the cone" , the seal has the same effect , but using different regions only.
China currently uses two forms of the same . Affect the sealing effect is a common cause when machining starting hole size is too large , so that the thread deformation short crest wider, resulting in the sealing surface decreases, when the seal leak after pressure rises ,security seal and even plugs pressed out . As filler medium to be sealed leak corrosion phenomena in the chemical industry pumps also have occurred, so the choice of filler is also one of the factors considered sealed .
Pump plugs frequently used , is another form of thread sealing . Taking into account the manufacturing economy plugs , generally can not play alone with threaded seal, often with raw tape, sealant fillers for thread sealing gap . Its bearing capacity depends on thread manufacturing precision and material, with plugs and threaded hole with the form does not matter. Threaded holes with plugs either a " cone on cone" or " columns on the cone" , the seal has the same effect , but using different regions only.
China currently uses two forms of the same . Affect the sealing effect is a common cause when machining starting hole size is too large , so that the thread deformation short crest wider, resulting in the sealing surface decreases, when the seal leak after pressure rises ,security seal and even plugs pressed out . As filler medium to be sealed leak corrosion phenomena in the chemical industry pumps also have occurred, so the choice of filler is also one of the factors considered sealed .
2013年10月7日星期一
Effective measures to exclude mechanical seal failure
There are many ways to troubleshooting , here are a few conventional methods , for reference.
1 , must be monitored when the pump is running mechanical seal flush water return temperature , normal operation at 40 ℃ ~ 50 ℃ is the best, when the alarm when the temperature exceeds 85 ℃ , when the temperature exceeds 90 ℃ trip .
2, to improve water quality. User pump, water pump and mechanical seal according to certain requirements implemented. Necessary, increase the coarse strainer for coarse filter , improving water quality to avoid failure .
3, for sealing the circulatory system to regularly washable , clean dirt and impurities, especially magnetic filters must be cleaned regularly switch to prevent dirt clogging the filter , resulting in seal cavity without water , resulting in ring crumble , resulting in failure .
4 , the pump operation manual before operating according to a certain operation , good exhaust , give seal cooling water before starting to pump . Conversely operation to seal the first start after the cooling water is likely to cause sealing ring movement burst.
5, the user of the minor repairs , replacement of the mechanical security seals should pay attention to clean all sealing parts, check friction surface , not a scratch , rubber O-ring is defective , really no problem before installing high-pressure boiler feed pump is in use use of a certain technical requirements , if not by the manufacturer 's technical requirements, the use of will malfunction.
1 , as in the pump is installed , you can not correctly installed according to the installation instructions , resulting in pump vibration, so that the pump mechanical seal face fit is not good enough , or the failure to open end , the seal leakage.
2 , the pump is running , or due to other reasons not fully exhaust the sealed chamber contains gas , operation pressure in the sealed chamber under the action of friction moment cause seal leakage prop open failure.
3 , the circulatory system is not clean or filter cleaning dirty , poor water quality , a foreign body, mud , etc., so that the friction surface wear can also result in serious trouble . Such as Anhui Huainan power plants, because the water is bad, bad cooling cycle , the heat transfer performance.
4 , in addition to the pump run time due to sudden pressure fluctuations , resulting in pulse pressure or frequent starts can make transmission parts , parts of the weak links in the anti-rotation cause damage , resulting in mechanical seal failure . So users using high pressure boiler feed pump when the first power plant process to resolve the correctness of the process is running to minimize pressure fluctuations , reducing the number of frequent start . In addition, the mechanical trailer seals to be considered in the design of wear -loop transfer torque to the driven shaft and the stationary ring from the stator is transmitted to the pump and starting force transmitted to the ring from the shaft drive on the strength calculation and choose to avoid generate more problems.
1 , must be monitored when the pump is running mechanical seal flush water return temperature , normal operation at 40 ℃ ~ 50 ℃ is the best, when the alarm when the temperature exceeds 85 ℃ , when the temperature exceeds 90 ℃ trip .
2, to improve water quality. User pump, water pump and mechanical seal according to certain requirements implemented. Necessary, increase the coarse strainer for coarse filter , improving water quality to avoid failure .
3, for sealing the circulatory system to regularly washable , clean dirt and impurities, especially magnetic filters must be cleaned regularly switch to prevent dirt clogging the filter , resulting in seal cavity without water , resulting in ring crumble , resulting in failure .
4 , the pump operation manual before operating according to a certain operation , good exhaust , give seal cooling water before starting to pump . Conversely operation to seal the first start after the cooling water is likely to cause sealing ring movement burst.
5, the user of the minor repairs , replacement of the mechanical security seals should pay attention to clean all sealing parts, check friction surface , not a scratch , rubber O-ring is defective , really no problem before installing high-pressure boiler feed pump is in use use of a certain technical requirements , if not by the manufacturer 's technical requirements, the use of will malfunction.
1 , as in the pump is installed , you can not correctly installed according to the installation instructions , resulting in pump vibration, so that the pump mechanical seal face fit is not good enough , or the failure to open end , the seal leakage.
2 , the pump is running , or due to other reasons not fully exhaust the sealed chamber contains gas , operation pressure in the sealed chamber under the action of friction moment cause seal leakage prop open failure.
3 , the circulatory system is not clean or filter cleaning dirty , poor water quality , a foreign body, mud , etc., so that the friction surface wear can also result in serious trouble . Such as Anhui Huainan power plants, because the water is bad, bad cooling cycle , the heat transfer performance.
4 , in addition to the pump run time due to sudden pressure fluctuations , resulting in pulse pressure or frequent starts can make transmission parts , parts of the weak links in the anti-rotation cause damage , resulting in mechanical seal failure . So users using high pressure boiler feed pump when the first power plant process to resolve the correctness of the process is running to minimize pressure fluctuations , reducing the number of frequent start . In addition, the mechanical trailer seals to be considered in the design of wear -loop transfer torque to the driven shaft and the stationary ring from the stator is transmitted to the pump and starting force transmitted to the ring from the shaft drive on the strength calculation and choose to avoid generate more problems.
2013年9月26日星期四
Analysis of the form and function of the bearing seal
Bearing seal of the main type refers both end faces of the rolling bearing , the effect of mounting a sealing device . Bearing Sealed With industrial development gradually into the horizon , in recent years that it has been the focus of a technology before the development of the bearing seal bearings are all open bearings .
In the form of bearing seal
Different structure of the bearing seal ring , the sealing effect is also a difference . Seal and the shaft bearing bolt seals a gap between , called non-contact bearing seals , which seal the sealing is better the smaller the gap , but the gap is reduced to allow the shaft will reduce the rotational speed , and vice versa The greater the gap sealing effect is worse , the higher the rotational speed of the shaft allows .
Bearing seal between the shaft seal and the gap does not exist , is known to be contact seals . Bearing seal with contact seal type, seal lip contact with the contact surface of the shaft determines the sealing effect , the greater the contact surface of sealing better, but allows lower speed shaft , otherwise the smaller sealing surface in contact with the sealing effect is more poor, but the shaft allow higher speed .
The role of bearing seal
Maintained a rolling bearing seal the inside and the outside is basically in isolation , bearing the added variety of internal lubricants, grease substances minimal wastage , and lubrication effect has been significantly improved , thus bearing seal can to a large extent to maintain bearing lubrication state.
Another effect of the bearing seal is cut off from the outside world inside the bearing contact with various substances to reduce dust ,strap seals harmful gases and other substances into the bearing cavity chance to reduce impurities inside the bearing because of the formation of a variety of injuries infringement . From one hand, the relative bearing seal can improve bearing life.
In the form of bearing seal
Different structure of the bearing seal ring , the sealing effect is also a difference . Seal and the shaft bearing bolt seals a gap between , called non-contact bearing seals , which seal the sealing is better the smaller the gap , but the gap is reduced to allow the shaft will reduce the rotational speed , and vice versa The greater the gap sealing effect is worse , the higher the rotational speed of the shaft allows .
Bearing seal between the shaft seal and the gap does not exist , is known to be contact seals . Bearing seal with contact seal type, seal lip contact with the contact surface of the shaft determines the sealing effect , the greater the contact surface of sealing better, but allows lower speed shaft , otherwise the smaller sealing surface in contact with the sealing effect is more poor, but the shaft allow higher speed .
The role of bearing seal
Maintained a rolling bearing seal the inside and the outside is basically in isolation , bearing the added variety of internal lubricants, grease substances minimal wastage , and lubrication effect has been significantly improved , thus bearing seal can to a large extent to maintain bearing lubrication state.
Another effect of the bearing seal is cut off from the outside world inside the bearing contact with various substances to reduce dust ,strap seals harmful gases and other substances into the bearing cavity chance to reduce impurities inside the bearing because of the formation of a variety of injuries infringement . From one hand, the relative bearing seal can improve bearing life.
2013年9月24日星期二
Valve leakage sealing performance factors
Assessment of the valve is the valve sealing performance merits of the main indicators of quality . Valve sealing performance factors that may affect whether the valve leakage and leakage size. Valve sealing performance mainly include two aspects, namely, leakage and leakage . Endoleak refers to the closure member between the valve seat and sealing of the media reach , assessment criteria within the country there are two missing . One is the State Technical Supervision Bureau released in December 1992 , June 1, 1993 began the implementation of a national standard GB/T13927-1992 " universal valve pressure test ." This standard is used with reference to the international standard ISO5208-1982 " Industrial valve pressure test " developed ; another was issued by the Ministry of Machinery Industry JB/T9092-1999 " valve testing and inspection ," This standard is referenced API598-1986 "Valve inspection and test " developed .
GB/T13927-1992 for general industrial valves inspection ; JB/T9092-1999 industrial valves for the oil inspection . Leakage refers to the parts of the stem packing leak , the leak in the flange gasket and valve parts casting defects caused due to leakage, leakage is simply not allowed. If the media is not allowed into the atmosphere , then the leakage of seal leakage than the inner seal more important. Therefore, the valve sealing performance should lead to the manufacturer 's attention.
Factors affecting the performance of the main valve seal are: ① sealing surface quality ; ② sealing surface width ; ③ valve before and after the valve pressure difference ; ④ sealing surface material and its processing status ; ⑤ media properties ; ⑥ surface hydrophilicity ; ⑦ seal film presence ; ⑧ closed parts of rigidity and structural characteristics .
( 1 ) the width of the sealing surface of the valve sealing performance of the sealing surface width determines the length of the pores . When the width is increased, fluid movement along the pores stroke lengthened to increase the resistance movement . Can be reduced to increase the width of the sealing surface pressure in the valve erosive wear . Increase the width of the sealing surface , it will cause leakage increased in proportion to the stroke length , and thus be able to proportionately reduce leakage. But the sealing surface width increases , in the same sealing force , wire seal the sealing pressure than decreases, but also make the possibility of leakage increases. Therefore, the increase can not be unlimited sealing surface width.
( 2 ) The quality of the sealing surface of the valve sealing performance of the sealing surface of the valve seat and the closure member is in contact with each other to shut down part. When the sealing surface pressure at 40MPa or less, the quality of the sealing surface of the valve sealing performance play a decisive role . This is because : When the sealing surface pressure is small, low surface roughness , the leakage is increasing rapidly . When the sealing surface pressure is large, the surface roughness on the leakage has been significantly reduced .
⑶ valve before and after the valve differential pressure on the valve sealing performance is analyzed theoretically , valves before and after the valve pressure difference is proportional to both the amount of leakage . But tests proved : in other conditions are the same , the leakage volume growth is increasing pressure differential over .
Leakage between the pressure difference can be approximated by the following formula :
G = M (N △ P2 + S △ P) where : M, N, S - constant coefficients, which depend on the material , the processing quality of the sealing surface , security seals sealing surface pressure and other conditions ;
△ P - pressure differential.
GB/T13927-1992 for general industrial valves inspection ; JB/T9092-1999 industrial valves for the oil inspection . Leakage refers to the parts of the stem packing leak , the leak in the flange gasket and valve parts casting defects caused due to leakage, leakage is simply not allowed. If the media is not allowed into the atmosphere , then the leakage of seal leakage than the inner seal more important. Therefore, the valve sealing performance should lead to the manufacturer 's attention.
Factors affecting the performance of the main valve seal are: ① sealing surface quality ; ② sealing surface width ; ③ valve before and after the valve pressure difference ; ④ sealing surface material and its processing status ; ⑤ media properties ; ⑥ surface hydrophilicity ; ⑦ seal film presence ; ⑧ closed parts of rigidity and structural characteristics .
( 1 ) the width of the sealing surface of the valve sealing performance of the sealing surface width determines the length of the pores . When the width is increased, fluid movement along the pores stroke lengthened to increase the resistance movement . Can be reduced to increase the width of the sealing surface pressure in the valve erosive wear . Increase the width of the sealing surface , it will cause leakage increased in proportion to the stroke length , and thus be able to proportionately reduce leakage. But the sealing surface width increases , in the same sealing force , wire seal the sealing pressure than decreases, but also make the possibility of leakage increases. Therefore, the increase can not be unlimited sealing surface width.
( 2 ) The quality of the sealing surface of the valve sealing performance of the sealing surface of the valve seat and the closure member is in contact with each other to shut down part. When the sealing surface pressure at 40MPa or less, the quality of the sealing surface of the valve sealing performance play a decisive role . This is because : When the sealing surface pressure is small, low surface roughness , the leakage is increasing rapidly . When the sealing surface pressure is large, the surface roughness on the leakage has been significantly reduced .
⑶ valve before and after the valve differential pressure on the valve sealing performance is analyzed theoretically , valves before and after the valve pressure difference is proportional to both the amount of leakage . But tests proved : in other conditions are the same , the leakage volume growth is increasing pressure differential over .
Leakage between the pressure difference can be approximated by the following formula :
G = M (N △ P2 + S △ P) where : M, N, S - constant coefficients, which depend on the material , the processing quality of the sealing surface , security seals sealing surface pressure and other conditions ;
△ P - pressure differential.
2013年9月13日星期五
Sealing butterfly valve with hard seal butterfly valve and use of the distinction
Valve seal means sealing the sides are rigid metallic material or other materials are called "hard seal ." This seal sealing performance is poor, but high temperature, abrasion resistance, good mechanical properties , such as : steel + steel ; steel + copper ; steel + graphite ; steel + alloy ; ( where steel may be cast iron, cast steel, alloy steel may be surfacing , spraying the alloy ) .
Soft sealing : sealing the sides of the metal material side , the other side there is a flexible non-metallic materials are called "soft seal ." This seal sealing performance is good, but not high temperature, easy to wear, mechanical poor , such as: steel + rubber ; steel + PTFE [wiki] polyethylene [/ wiki]; etc. soft sealing seat using a certain strength , hardness and heat resistance of non-metallic materials, good sealing performance, zero leakage can be done , but the life and relatively poor adaptability to temperature . Hard sealed with metal production, sealing performance is relatively poor , despite the manufacturers claim can be done zero leakage. Soft seal on the part of corrosive materials can not meet the technical requirements , the seal can be solved ! These two seals can complement each other , just in terms of soft seal tightness is relatively good , but now it is possible to seal tightness meet the corresponding requirements ! soft seal the advantage of good sealing performance , the disadvantage is easy to aging , wear, short life. Seal long life, but the relative tightness worse than the soft seal .
Their structural differences are mainly the following:
1, the structural differences : soft seal butterfly mostly in line more than a single eccentric hard sealing , double eccentric butterfly valve
2 , temperature : soft plastic seal for normal environments. Seal can be used for low temperature , room temperature , high temperature and other environmental
3 , pressure: soft sealing pressure - atmospheric pressure seal can also be used in high-pressure and other conditions
4 , the sealing performance: soft cargo seal and three eccentric hard sealing butterfly valve sealing performance is better, three eccentric butterfly valve in the high pressure high temperature environment can maintain a good seal.
In view of the above characteristics, soft seal butterfly valve for opening and closing the ventilation and dust piping bidirectional adjustment, water , light industry, petroleum, chemical and other industries. Hard seal butterfly valve used for heating, gas , and coal gas , oil, acid and alkali environment .
With the widespread use of butterfly valves , its easy installation, easy maintenance , simple structure features becoming increasingly apparent. Electric soft seal butterfly valve, pneumatic soft seal butterfly valve, hard seal butterfly valve in more and more places began to replace the electric gate valve, globe valve.
Soft sealing : sealing the sides of the metal material side , the other side there is a flexible non-metallic materials are called "soft seal ." This seal sealing performance is good, but not high temperature, easy to wear, mechanical poor , such as: steel + rubber ; steel + PTFE [wiki] polyethylene [/ wiki]; etc. soft sealing seat using a certain strength , hardness and heat resistance of non-metallic materials, good sealing performance, zero leakage can be done , but the life and relatively poor adaptability to temperature . Hard sealed with metal production, sealing performance is relatively poor , despite the manufacturers claim can be done zero leakage. Soft seal on the part of corrosive materials can not meet the technical requirements , the seal can be solved ! These two seals can complement each other , just in terms of soft seal tightness is relatively good , but now it is possible to seal tightness meet the corresponding requirements ! soft seal the advantage of good sealing performance , the disadvantage is easy to aging , wear, short life. Seal long life, but the relative tightness worse than the soft seal .
Their structural differences are mainly the following:
1, the structural differences : soft seal butterfly mostly in line more than a single eccentric hard sealing , double eccentric butterfly valve
2 , temperature : soft plastic seal for normal environments. Seal can be used for low temperature , room temperature , high temperature and other environmental
3 , pressure: soft sealing pressure - atmospheric pressure seal can also be used in high-pressure and other conditions
4 , the sealing performance: soft cargo seal and three eccentric hard sealing butterfly valve sealing performance is better, three eccentric butterfly valve in the high pressure high temperature environment can maintain a good seal.
In view of the above characteristics, soft seal butterfly valve for opening and closing the ventilation and dust piping bidirectional adjustment, water , light industry, petroleum, chemical and other industries. Hard seal butterfly valve used for heating, gas , and coal gas , oil, acid and alkali environment .
With the widespread use of butterfly valves , its easy installation, easy maintenance , simple structure features becoming increasingly apparent. Electric soft seal butterfly valve, pneumatic soft seal butterfly valve, hard seal butterfly valve in more and more places began to replace the electric gate valve, globe valve.
2013年9月11日星期三
Experts tell you do choose plastic window seal
Leakage leaking sealant seals at play
"I lived on the 9th floor , the house has lived for six years, recent heavy rains , many places are leaking windows , and ventilation is very serious, how is this going ? " Ms. Hou , who lives in intimate garden advice .
Experts say : It is Door Changchun Da Wang Jinhong manager introduced into July , Changchun temperature surge, but sooner or later the temperature difference is quite large , mutant temperature makes general quality steel windows stretching more obvious , especially in the window sealant, rail car seals after a heavy rain, exposure and other reasons , making the glass and sash seal tightly enough to appear leakage leaking situation. Consumers can check their own windows, first check whether there is sediment drain , clean-up if it is missing , we should replace the seals and a large area of sealant . Second seal and sealant replacement to note that these small pieces of quality vary widely , a good seal can be used on 2078 , or even ten years are no problems, and poor quality may 2023 will be aging . Window sealant , too, generally imported glue to better seal the wall and window frames , no leakage , winter warmth, no air leakage . Poor quality sealant will shrink after Enthusiasm , or even fall off .
Fog cover insulating glass windows are leaking due to
"My family is opposite a large ecological park , but recently the bedroom window somehow a large area of fog , mist between two layers of glass , not simply wipe the park landscape of sight ." Zhou , who lives in city wide she says.
Experts : City Engineering Manager Jiang Hao others pointed out , this situation is because steel windows hollow glass leak caused , if shelf life has expired , only to replace the glass . Replacement to a regular manufacturers to buy , because regular steel window factory specialized in the production , the use of large machines repression, evacuated of air between the glass are basically machine operation , and some small handicraft workshop , the majority or in manual-based , difficult to ensure quality, double-glazed security seals sealant will be breathable. Consumers are choosing steel window making factory , it is best to look at its factory site to see if there are relevant certificates , whether the technology is clearance. Secondly, they have a lot to the owners has produced a good windows, consumers can look carefully at whether the clearance of their craft , handled the details of the connection is fine and smooth, whether seals pores and so on. Third, if the conditions , the consumer can field their construction site to see .
Defective serious security risk profiles
"I lived in a 12-story , yang side floor bedroom is large windows , the sash is very large. Recent heavy winds, steel window frames were blown straight drum , looking quite startling . Heavy downpour , looking for professional inspection , startled , the original large windows so many places that are not lined , Zai Yu wind, really disastrous consequences ! " Mr. Zheng to the newspaper .
Experts say : Fund Manager pointed out that most problems are steel window steel liner thickness unqualified or without liner , followed actuator angle chain failed, sealing tape aging, a pull on the crack or fracture , then there is some small workshops windows with plastic from the other removed to the "second-hand goods", reprocessed into windows . Small workshop processing steel window factory itself is a problem , coupled with cut corners , shoddy deceive means to cause new for steel windows appear breathable, water seepage, no wind force and other quality problems . After a market test of the brand really only a few , but these profiles OEM brand is also very much , consumers must be careful when steel windows , it is best to have scale , professional manufacturers purchase .
In addition, steel window design and installation process is also very important, such as the height of the middle frame to take a more appropriate value at least equal to the height of the upper and lower beams . When the box width of 1.5 meters, the window may be considered without vertical transom beam , when the frame width of 1.8 meters , then the window to add vertical transom beam . These designs are very particular about not only beautiful, but also windproof and warm.
In the installation , the regular scale factories have professional home design for home owners in the specific circumstances of the original windows or balconies at the construction, whether to use steel, how to install the liner , how to punch drilling has relevant norms and acceptance.
"I lived on the 9th floor , the house has lived for six years, recent heavy rains , many places are leaking windows , and ventilation is very serious, how is this going ? " Ms. Hou , who lives in intimate garden advice .
Experts say : It is Door Changchun Da Wang Jinhong manager introduced into July , Changchun temperature surge, but sooner or later the temperature difference is quite large , mutant temperature makes general quality steel windows stretching more obvious , especially in the window sealant, rail car seals after a heavy rain, exposure and other reasons , making the glass and sash seal tightly enough to appear leakage leaking situation. Consumers can check their own windows, first check whether there is sediment drain , clean-up if it is missing , we should replace the seals and a large area of sealant . Second seal and sealant replacement to note that these small pieces of quality vary widely , a good seal can be used on 2078 , or even ten years are no problems, and poor quality may 2023 will be aging . Window sealant , too, generally imported glue to better seal the wall and window frames , no leakage , winter warmth, no air leakage . Poor quality sealant will shrink after Enthusiasm , or even fall off .
Fog cover insulating glass windows are leaking due to
"My family is opposite a large ecological park , but recently the bedroom window somehow a large area of fog , mist between two layers of glass , not simply wipe the park landscape of sight ." Zhou , who lives in city wide she says.
Experts : City Engineering Manager Jiang Hao others pointed out , this situation is because steel windows hollow glass leak caused , if shelf life has expired , only to replace the glass . Replacement to a regular manufacturers to buy , because regular steel window factory specialized in the production , the use of large machines repression, evacuated of air between the glass are basically machine operation , and some small handicraft workshop , the majority or in manual-based , difficult to ensure quality, double-glazed security seals sealant will be breathable. Consumers are choosing steel window making factory , it is best to look at its factory site to see if there are relevant certificates , whether the technology is clearance. Secondly, they have a lot to the owners has produced a good windows, consumers can look carefully at whether the clearance of their craft , handled the details of the connection is fine and smooth, whether seals pores and so on. Third, if the conditions , the consumer can field their construction site to see .
Defective serious security risk profiles
"I lived in a 12-story , yang side floor bedroom is large windows , the sash is very large. Recent heavy winds, steel window frames were blown straight drum , looking quite startling . Heavy downpour , looking for professional inspection , startled , the original large windows so many places that are not lined , Zai Yu wind, really disastrous consequences ! " Mr. Zheng to the newspaper .
Experts say : Fund Manager pointed out that most problems are steel window steel liner thickness unqualified or without liner , followed actuator angle chain failed, sealing tape aging, a pull on the crack or fracture , then there is some small workshops windows with plastic from the other removed to the "second-hand goods", reprocessed into windows . Small workshop processing steel window factory itself is a problem , coupled with cut corners , shoddy deceive means to cause new for steel windows appear breathable, water seepage, no wind force and other quality problems . After a market test of the brand really only a few , but these profiles OEM brand is also very much , consumers must be careful when steel windows , it is best to have scale , professional manufacturers purchase .
In addition, steel window design and installation process is also very important, such as the height of the middle frame to take a more appropriate value at least equal to the height of the upper and lower beams . When the box width of 1.5 meters, the window may be considered without vertical transom beam , when the frame width of 1.8 meters , then the window to add vertical transom beam . These designs are very particular about not only beautiful, but also windproof and warm.
In the installation , the regular scale factories have professional home design for home owners in the specific circumstances of the original windows or balconies at the construction, whether to use steel, how to install the liner , how to punch drilling has relevant norms and acceptance.
2013年8月26日星期一
Engineering mechanical seal selection method
mechanical security seals according to the working conditions and the different nature of the media, with high temperature, low temperature mechanical seals, high pressure, corrosion-resistant mechanical seals, mechanical seals and resistance to particulate media to adapt easily vaporized light hydrocarbon medium, mechanical seals, etc., should be based on different usefulness select a different structural types and materials of the mechanical seal.
Selection of the main parameters are: seal chamber pressure (MPa), fluid temperature (℃), working speed (m / s), the sealing properties of the fluid and the effective installation space.
Selection of the basic principles are:
1 according to the seal chamber pressure to determine the sealing structure using balanced or unbalanced, single face or double, etc.;
(2) according to the working speed, determine the use of rotary or static, hydrodynamic or non-contact type;
3 according to the temperature and fluid properties, determine the friction and auxiliary sealing materials, as well as the right choice lubrication, washing, heat, cooling, mechanical Security seals loop protection system;
4 According to the sealed space efficient installation, determine the use of multi-or single spring or springs wave springs, built-in or externally mounted.
Selection of the main parameters are: seal chamber pressure (MPa), fluid temperature (℃), working speed (m / s), the sealing properties of the fluid and the effective installation space.
Selection of the basic principles are:
1 according to the seal chamber pressure to determine the sealing structure using balanced or unbalanced, single face or double, etc.;
(2) according to the working speed, determine the use of rotary or static, hydrodynamic or non-contact type;
3 according to the temperature and fluid properties, determine the friction and auxiliary sealing materials, as well as the right choice lubrication, washing, heat, cooling, mechanical Security seals loop protection system;
4 According to the sealed space efficient installation, determine the use of multi-or single spring or springs wave springs, built-in or externally mounted.
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