After the pump is turned over and the moving and static rings are worn, the displacement cannot be compensated.While ensuring the radial seal, the movable ring can be flexibly moved on the shaft after assembly ( Press the moving ring against the spring to spring back freely).　　 Countermeasures: The above problems can be corrected according to the maintenance standards. Countermeasures: When assembling the mechanical seal, the axial movement of the shaft should be less than . The main positions of the grinding shafts are as follows: moving ring auxiliary sealing ring, static ring position, A few springs have shaft grinding. Some have rotted and lost their proper function, resulting in the phenomenon of shaft grinding.　　 

Countermeasures: The height of the lubricating oil surface in the oil chamber cavity should be higher than the sealing surface of the dynamic and static rings. Due to the corrosion of the weak acid and weak alkali of the moving and static ring auxiliary seals, the rubber parts have no elasticity. The operation of mechanical seals directly affects the normal operation of pumps. The summary analysis is as follows. The main part of the grinding shaft is a rubber bellows, and because the upper sealing surface is in a poor lubrication state, the friction torque between the moving and static rings is greater than the transmission torque between the rubber bellows and the shaft, and relative rotation occurs. 

When using mechanical seals, various factors of using mechanical seals should be analyzed, so that the mechanical seals are suitable for the technical requirements and medium requirements of various pumps and have sufficient lubrication conditions, so as to ensure long-term and reliable operation of the seal. Insufficient lubricant on the sealing surface causes dry friction or roughness on the sealing end surface.The main reasons for shaft grinding: BIA type double end face mechanical seal, the back pressure state is a bad working condition, particles and impurities in the medium can easily enter the sealing surface and cause the seal to fail. 

The reason is the misalignment of the stator and the upper and lower end caps or the imbalance of the impeller and the main shaft, cavitation or bearing damage (wear), this situation will shorten the seal life and cause leakage.The rotor vibrates periodically. It has a pair of end faces perpendicular to the axis of rotation.Shaft grinding phenomenon caused by seal leakage of small submersible pumps The mechanical seal failure of small pumps below 715kW often produces grinding shafts. Common leakage phenomena The leakage of mechanical seals accounts for more than 50% of all repaired pumps. A mechanical seal is also called an end face seal.The mechanical seal itself is a demanding PTFE coated adhesive tapes precision component, which has high requirements on design, machining, and assembly quality.

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