Model of the mechanical seal

In order to adapt to different working conditions , there are many different mechanical seal of the type :
1, according to the logarithm of the seal faces , into a single face , double face and other mechanical seal.
Single face - the sealing device in only one pair of seal faces . It is simple in structure , is commonly used mechanical seal type .
Double face - the sealing device has two end faces of the seal . Its complex structure, suitable for highly corrosive , flammable , toxic and harmful media and vacuum applications.
2, according to the role of the sealed fluid pressure in the sealed end face is unloading or unloading can be divided into balanced and unbalanced mechanical seal .
Balanced - sealed fluid pressure acting on the seal end face of the part or all of unloading unloading .
Unbalanced - the sealed fluid acting on the end surface of the sealing pressure is not unloading .
Balanced suitable for medium and high-pressure conditions of mechanical seals ; unbalanced voltage conditions applicable to the mechanical seal.
3, according to the spring is placed within a security stickers sealed fluid is divided into spring and spring built-in external mechanical seal.
Built-in spring - spring is placed within a sealed fluid .
External spring - spring placed outside the sealed fluid .
Spring built-in seal face stress state is good, small amount of leakage , cooling and lubrication is good. So, in addition to corrosive media , shall as far as possible using the built -in structure .
4, according to the number of springs compensation structure , divided into single and multi- spring type spring type mechanical seal .
Single spring - in only one spring compensation mechanism . It is used for lighting loads , shaft diameter smaller occasions .
Multi-spring - in the compensation mechanism has a plurality of springs . For the larger shaft diameter . Sealing end face spring force distribution is more uniform, but the spring wire diameter is small, a greater impact of corrosion on the spring .
5, according to whether the compensation mechanism rotates with the shaft is divided into rotary and stationary mechanical seal.
Rotary - compensating ring rotates with the shaft .
Static - compensation ring does not rotate with the shaft .
General mechanical rotary tamper evident label seal is often used , because the compensation mechanism and the shaft is simple in structure , small radial dimension . However, in high-speed conditions, compensation and other rotating parts ring centrifugal force generated greater impact , balancing high requirements , the use of static type is more appropriate.