51. Please briefly explain why the oil pump needs to continue running for a while after the unit is shut down?

2021-10-21View Original

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51. Please briefly explain why the oil pump needs to continue running for a while after the unit is shut down?

Reply #22021-10-22

The machine needs to run idly for a while; during this time, lubrication is required, otherwise the bearings (bushing) will be damaged

Reply #32021-10-23

Once the machine shaft comes to a stop, the bearing shells and journal are exposed to heat conducted from within the machine and the rotor; this causes their temperature to rise rapidly. As a result, the quality of the local oil film deteriorates, leading to damage to both the journal and the tungsten alloy lining of the bearing shells. Therefore, after the unit is shut down, the lubricating oil pump must continue to operate for some time to circulate the oil and remove the accumulated heat from inside the machine.

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