Causes of wear of self-priming pump shaft

There are many reasons for the wear of the self-priming pump shaft, but most of them are due to the normal wear of the self-priming pump shaft because it has been used for too long. There are other reasons, of course. For example, it is caused by eccentric wear of the self-priming pump shaft, shaft bending, assembly error, too large centering deviation of the pump rotor and the motor rotor, etc.
Photo of self-priming pump shaft wear causes of self-priming pump bearing wear most of the eccentric wear of self-priming pump shaft is caused by shaft bending, and the wear caused by too loose bearing inner ring or bearing damage at the bearing journal also often occurs. Treatment methods: Hot calibration, cold calibration, mixed calibration, etc.
Most of the shaft bending occurs on multistage centrifugal pumps and submersible pumps because the shafts of these pumps are relatively long. The rotor dynamic imbalance is too large, the rotor vibrates, and the foundation level of the self-priming centrifugal pump is too poor. Another reason is the sagging caused by untimely turning, the temperature difference between the upper and lower parts of the rotor will cause deformation, and the vibration caused by centering deviation when the dynamic imbalance of the rotor is too large.
Self priming centrifugal pump is one of the machines that pump or pressurize liquid. The self-priming pump transfers the mechanical energy or other external energy of the prime mover to the liquid to ensure that the energy of the liquid will increase. It can be mainly used to pump the liquid, including oil, water, emulsion, acid-base liquid, suspended lotion, liquid metal, etc.
Shaft wear often occurs in the long-term operation of non sealed self-priming pump. After analysis, the wear of the self-priming pump shaft is caused by the following reasons.
(1) When assembling the bearing, it is caused by insufficient or no interference between the bearing inner ring and the main shaft.
(2) The alignment deviation between the pump rotor and the motor rotor is too large, and there will be too much vibration during the operation. If the bearing wear is serious, there will even be jamming, resulting in shaft wear.
(3) Compared with the mechanical seal, the traditional packing seal has poor wear resistance and short service life. If the water leakage of the shaft seal increases and the water blocking failure of the water retaining ring causes water inflow of the bearing chamber and bearing damage.
(4) High temperature sintering caused by rapid temperature rise will occur when the bearing is stuck due to lack of oil or oil seal failure suction and the impurities contained in the lubricating oil. When the self-priming pump shaft is worn, the traditional solution is repair welding or machining repair after brush plating. However, there are certain disadvantages in both. The stress generated by repair welding at high temperature cannot be completely eliminated, which is easy to cause material damage. Causing the component to bend or break.
Brush plating is limited by the thickness of the coating, and it is easy to peel off. Both methods need to use metal for repair, which will still cause re wear under the effect of various comprehensive properties. The wear of the self-priming pump shaft can be repaired by using special materials. High temperature will not be generated during repair, which can prevent the influence of repair welding thermal stress, and will not be limited by the unilateral wear of the shaft during repair. This special material can absorb the impact of external force and prevent the possibility of re abrasion.

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