Which expert knows the problem with this multi-stage bouncer?
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The problem is that once the rotor is reinstalled, everything works fine; however, there is significant vibration during operation on site, the pressure is insufficient, and the rear bearings often burn out.
Measure the shaft runout; it seems the balance disc is quite corroded – take it apart completely for an inspection.
If the pressure is not sufficient, check the clearance of the mouth ring, the clearance between stages, etc. In multi-stage pumps, it is the control of the assembly clearance between the balance disk and the balance drum that is crucial. Given the degree of rust on your balance disc, it is recommended to have it repaired or replaced; otherwise, the balance of axial force cannot be ensured. Follow the maintenance procedures for multi-pump systems strictly; I’m sure you can handle it
When turning the disk without bearings, isn’t it easy for the interior to get worn?
The pressure is low; it is presumed that the gaps between the various rings and throttle sleeves are too large. While assembly becomes easier, the performance deteriorates as a result； The bearing is burning; it is presumed that the axial force balance is poor, perhaps due to an increase in the clearance of the balancing mechanism ； The vibration is severe; it is presumed to be caused by poor dynamic balance of the rotor or inadequate balance of axial forces. Further testing is needed to determine in which direction the vibration levels are excessive
Just get a self-balancing pump. Worry-free
It would be best to send the drawings of that pump. It seems that both the front and rear bearings are deep groove ball bearings; if that’s the case, the side clearances of these bearings need to be properly controlled.
It is necessary to disassemble and check the wear of the mouth ring and balancing device. Since this flow-over component is likely made of ordinary material, it is also important to check whether the impeller is damaged or not; replacement may be required depending on the findings
Measure the connections between various parts of the throat guide vanes to determine whether they fall within the scope of maintenance. Calculate the clearance of the balance disc’s balance seat. If there is no balance tube, consider installing thrust bearings. High vibration levels are likely due to poor alignment or pressure buildup caused by insufficient pumping capacity