What is the severity of an axial movement of 5 threads in the pump shaft of a screw unit?
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During a routine inspection, one of our screw refrigeration units was found to have an axial movement of 5 threads in the pump shaft. It was working normally before the inspection, with a slight noise. The manufacturer states that it cannot be activated if the axial displacement exceeds 2 microns. Could anyone with expertise give some advice? Is maintenance really necessary? Waiting online! ! !
What is the clearance of your end cover? If the clearance between the end caps is kept within the required range, there should be little impact. However, if the clearance is already very small and is reduced by another 0.05 mm, given that the clearance between the end caps of a refrigeration unit is originally quite small, thermal expansion needs to be taken into account after the unit starts up; as a result, there may be operational risks.
It is recommended to stop the machine for maintenance; otherwise, sudden damage during operation can have serious consequences.
Thank you; it is currently under repair. There is slight wear on the bearing shells at the rear end cover of the shaft, with no significant wear elsewhere.