Vibration of centrifugal pumps
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After operating for a period of time, a two-stage centrifugal pump (with a flow rate of around 36 cubic meters) begins to vibrate. Upon inspection, it was found that (due to unstable liquid flow during operation) the clearance between the outer radial thrust bearings had increased. The clearances between the front and rear bearing caps and the outer rings of the bearings were each 0.5 mm. What could be the reason for this?
It must be related to the motor; what’s the power rating of your motor in kilowatts?
How do I install the impeller? Judging from the appearance, it seems that the axial force is a bit high. Additionally, unstable fluid flow can also cause vibration.
Take a look at the two-stage clearance, as well as the prototype of the motor
Let’s find out what the source of the vibration is
Check the alignment of the pump and motor; cavitation in the impeller could also be the cause.
It should be related to the motor; what’s the power rating of your motor in kilowatts?
1: Is the pipeline configuration inappropriate? Is the allowable suction height too high? 2: Is there a problem with the balance disc? This could cause excessive axial movement. 3: Is the impeller aligned with the centerline of the flow channel?
The vibration is likely caused by impeller cavitation; it may have nothing to do with the bearing gland clearance, so we need to look for other causes.