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Common leakage of boiler feed water pump
Periodic leakage
(1) The axial feed amount of the boiler feed water pump rotor is large, the interference between the auxiliary seal and the shaft is large, and the moving ring cannot move flexibly on the shaft. After the pump is turned over and the moving and stationary rings are worn, no compensation displacement is obtained. Countermeasure: When assembling the mechanical seal, the axial yaw of the shaft should be less than 0.1mm, and the interference between the auxiliary seal and the shaft should be moderate. While ensuring the radial seal, the dynamic ring is equipped with all stainless steel boiler feed pumps to ensure the energy Move flexibly on the shaft (press the moving ring against the spring to bounce back freely).
(2) Insufficient amount of lubricant on the sealing surface causes dry friction or a brushed end face. Countermeasure: The height of the lubricating oil in the chamber of the oil chamber should be added to the sealing surface above the dynamic and static rings.
(3) The rotor periodically vibrates. The reason is that the stator is not centered with the upper and lower end caps or the impeller and the main shaft are unbalanced, cavitation or bearing damage (wear), which shortens the seal life and creates leakage.
Common leakage of boiler feed water pump
2. The grinding shaft phenomenon caused by leakage of small submersible sewage pump seal
(1) The failure of the small pump seal below 715kW often produces the grinding shaft. The grinding shaft position mainly includes the following: The moving ring auxiliary sealing ring, the static ring position, and a few springs have the grinding shaft phenomenon.
(2) Main reasons for grinding shaft: 1BIA type double-face mechanical seal, the back pressure state is a bad working condition, particles and impurities in the medium can easily enter the sealing surface, making the seal invalid. 2 The main part of the grinding shaft is a rubber bellows, and because the upper end sealing surface is in a poor lubrication state, the friction torque between the dynamic and static rings is greater than the transmission torque between the rubber bellows and the shaft, and relative rotation occurs. 3 The dynamic and static ring auxiliary seals are inelastic due to the corrosion of weak acid and weak alkali in the sewage. Some have rotted, lost their proper function, and produced a phenomenon of grinding the shaft.
(3) In order to solve the above problems, the following measures are taken: 1 Ensure the cleanliness of the lower end cover and the oil compartment, and prohibit the assembly of uncleaned lubricating oil. The oil level line in the chamber of the 2 machine seal chamber should be higher than the seal surface of the static and dynamic ring. 3 According to different media, choose different structure of the machine seal. For the high lift pump, the machine seal structure should be redesigned. For the corrosive medium rubber, the weak acid and weak base fluororubber should be selected. The machine seal static ring should be added to prevent resale.
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