Optimization strategies to extend the service life of centrifugal pump mechanical seals 一

In view of the factors affecting the service life of the mechanical seal of centrifugal pumps, targeted measures should be taken to complete the optimization. The specific countermeasures are:

1 Reduce pump shaft channeling

In view of the influencing factors of excessive pump shaft channeling, in order to reduce the pump shaft channeling, we can start from the following two aspects: First, install an axial thrust bearing on the balance plate or balance drum. The balance plate or balance drum can function as a balance shaft. The axial leg bearing can play the role of limiting the axial direction of the pump shaft. The second is to design the balance drum well so that it can exert its large balancing function and balance out most of the axial force, thereby achieving the goal of reducing the amount of pump shaft deflection.

2 Eliminate excessive axial force

For the problem of excessively large axial force, the axial force can be balanced to the greatest extent through reasonable design of the axial force balancing device, and the axial force can be controlled within a certain range to avoid it acting on the mechanical seal. Create a good environment for mechanical seal operation.

3 Eliminate excessive deflection

For the problem of large deflection, in order to eliminate this small influence, it can be solved through the following design methods: first, shorten the distance between the bearings at both ends, reduce the number of pump impeller stages, and increase the lift of the single-stage impeller; second, increase the For the diameter of the pump shaft, comprehensively consider many influencing factors such as transmission power, mechanical seal, shaft deflection, inertia load, etc., and appropriately increase the diameter of the pump shaft; third, use high-grade pump shaft materials; fourth, after completing the pump shaft design, Check the deflection of the pump shaft and control it within a certain range.