Conical shaft for the mechanical seal of the swing

Shaft swings may occur depending on the maximum pump heads ( the bottom one ) fluorine resin bearing radial clearance . According to the manufacturer 's standard , 9LDTN type condensate pump bearings allow maximum use of fluorine resin gap 0.4 mm, taking into account the fluorine resin bearing wear will not damage after mechanical seal , based on past experience overhaul , whichever heads fluorine resin bearing radial clearance to 2 mm. Principles calculations based on similar triangles , the mechanical seal shaft runout limit value of 0.24 mm, and then consider rolling under its own motor radial clearance is set to 0.1mm ( for 6226 bearing is damaged in terms of the gap ) , then mechanical shaft seals can get maximum runout of 0.34 mm. The selected mechanical seal allows runout of 0.5 ~ 0.7 mm, it will not damage the shaft for mechanical seal conical swing .

Transformation is due to the choice of cartridge single mechanical seal , installation is relatively simple and does not require any transformation of the pump , mechanical seal less work . However, in the transformation process involves the following considerations :
a) Check the condensate pump original packing sleeve outer periphery of ovality , elliptical too large to be replaced. Because mechanical seal sleeve must set this sleeve , with the Department by its O-ring indicative seal, sleeve oval spend much effect on the O-ring and sleeve contacts , causing leaks here .
b) packing sleeve and the shaft seal must be reliable without leakage, if packing between the sleeve and the shaft seal leakage , condensation will also affect water quality and vacuum unit .
c) the original packing chamber condensate pump outer face flat on the lathe processing needs . In order to ensure the mechanical seal stationary ring gland with a combination of good surface contact , it is best to fill up the cavity outer face flange portion for turning .
d) Install the mechanical seal , in a still sealed position using a good quality sealant to prevent leakage.
e) mechanical seal is in place, the pump and the motor must be in good and installed on the coupling after a fixed stationary ring and ring gland , and finally will be positioned to take the card to open . Otherwise , couplings and joints for adjusting the pendulum will cause partial radial and axial elevation will not only affect the mechanical seal static ring sealing surface contact , but also changes the mechanical seal tight static ring contact force, contact tightening force burned mechanical adjustable length seal over the General Assembly .
f) mechanical seal return pipe must be connected back to the pump inlet . Because the upper guide bearing a relief bore seal leakage , it serves to ensure the mechanical seal chamber pressure of not more than 490 kPa in effect, while the return pipe connected to a lower pressure , they may form a flow in order to promptly the movement of the mechanical seal sealing surface due to friction heat away .