The reason for the drop in pump efficiency

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

2, due to the pump before adding drugs or water quality, so that the pump casing serious fouling or corrosion. The serious fouling in the pump casing can increase the wall thickness of the pump casing by about 2 mm, and the scale of the pump wall forms a scale, which reduces the volume of the pump body, reduces the pumping volume, and roughens the flow path, leading to increased head loss. Both customer product efficiency and hydraulic efficiency are reduced.

3. Due to casting defects, cavitation, erosion, corrosion, and chemical erosion caused by the water pump processing process, voids or cracks are generated in the pump flow path, and vortexes are generated when water flows, resulting in energy loss. The hydraulic efficiency is reduced.

4. Cavitation erosion on the surface of the impeller. Since the negative pressure is generated when the back surface of the blade operates, when the pressure Pk<Pva, the vapor hole and the honeycomb surface are generated, and the pump blade is cavitation eroded under electrochemical corrosion.

5. Volume loss and mechanical loss. Due to the long-term use of the pump, mechanical wear creates leakage and increases in resistance, which reduces the volumetric efficiency and mechanical efficiency.

The above reasons make the performance of the water pump worse. The operating efficiency is reduced by 2 to 5%, and severely, the efficiency of the pump can be reduced by more than 10%.