Routine maintenance of centrifugal pumps

Precautions for use of centrifugal pumps

1. Preparation before starting up

In order to ensure the safe operation of the pump, the necessary checks should be made before starting the machine: firstly turn the coupling or pulley slowly, observe whether the pump is turning correctly, whether the rotation is flexible and stable, whether there is any debris in the pump, whether the bearing is running normally, the belt Whether the tightness is suitable; check whether all the screws are strong; check whether there are any debris around the unit that hinders the operation; check whether the suction pipe is deep enough; if there is a water outlet valve to close, reduce the starting load, and pay attention to open the valve in time after starting.

2, running inspection

After starting up, check whether the various instruments are working properly and stable, and the current should not exceed the rated value. The gauge pointer should be in the design range; check whether the water output of the pump is normal, check whether the parts of the unit are leaking; check the packing tightness. Under normal circumstances, there should be a small amount of leakage at the packing (no more than 10~20 drops per minute), mechanical The leakage of the seal should not be greater than 10 ml / hour (about 3 drops per minute); the rolling bearing temperature should not be higher than 75 ° C; the sliding bearing temperature should not be higher than 70 ° C. And pay attention to the presence or absence of abnormal noise, abnormal vibration, water output reduction; timely adjustment of the intrusion depth of the inlet pipe; often clean the floating debris on the trash rack; through the belt drive, but also pay attention to whether the belt slips.

3. Precautions after shutdown and shutdown

Before stopping the machine, the water outlet valve should be closed before stopping to prevent water backflow and damage to the machine parts. After each stop, the oil stains of the pump body and pipeline should be cleaned in time to keep the appearance of the unit clean and timely to identify hidden dangers; The water should be drained immediately to prevent cracking of the pump body and internal parts; after the end of the season, the necessary maintenance is required [7].

4. Periodic inspection of centrifugal pumps

The periodic inspection of centrifugal pumps can be generally divided into the following three types: 1) daily inspection, that is, inspection in use, as described above; 2) monthly inspection, cleaning and minor repairs on the exterior of the equipment without disassembling parts, including Inspection of bearing temperature, shaft seal leakage and motor insulation; 3) regular maintenance. Including replacement of shaft seal lubricant, check pump and motor alignment, check bushing wear, check coupling rubber ring damage, clean mechanical seal, coolant filter and pump filter, check sliding parts wear, check Each component that comes into contact with the liquid damages the corrosion, and the like.

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