The noise of water pump may be caused by the following aspects:

(1) The impact of the rotary vane on the cylinder block, the sound of the residual volume of the water pump and the pressure oil in the exhaust dead space;

(2) Impact of exhaust valve plate on valve seat and supporting parts;

(3) Echo and bubble cracking sound in the box;

(4) Bearing noise;

(5) Noise caused by a large amount of gas and oil impacting the oil baffle;

(6) Others. Such as the noise caused by the drive, the fan noise of the air cooling water pump, etc.

(7) Motor noise is a crucial factor.

1. Due to the scouring of the water flow, the inner wall of the pump channel and the water surface of the impeller become rough and uneven, the friction coefficient of the pump inner channel increases, and the water flow rate in the pump is large, so the head loss increases. The hydraulic efficiency is reduced.

2. Due to the reason of adding drugs or water quality in front of the pump, there is serious scaling or corrosion in the pump casing. Serious scaling in the pump casing can increase the wall thickness of the pump casing by about 2 ram, and scale tumors form on the inner wall of the pump, reducing the volume of the pump, reducing the pumping capacity, and making the flow channel rough, increasing the head loss. Both passenger product efficiency and hydraulic efficiency are reduced.