Reasons for water pump efficiency decline

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, the friction coefficient of the channel in the pump increases, and the head loss increases with the large flow velocity of water in the pump. Reduced hydraulic efficiency.

2. Due to the dosing of 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 2ram, and the scaling tumor is formed on the inner wall of the pump, which reduces the volume of the pump, reduces the pumping capacity, roughens the flow channel, and increases the head loss. Both the passenger volume efficiency and the hydraulic efficiency are reduced.

3. Due to the casting defects, cavitation, abrasion, corrosion and chemical etching caused by the water pump processing technology, holes or cracks are generated in the pump channel, and vortices are generated during water flow, resulting in energy loss. Reduced hydraulic efficiency.

4. Cavitation on impeller surface. As the negative pressure is generated when the blade operates behind the water surface, when the pressure pk<pva, cavitation and honeycomb surface are generated, and the pump blade is subject to electrochemical corrosion.

5. Volume loss and mechanical loss. As the pump is used for a long time, mechanical wear causes leakage and resistance increase, which reduces volumetric efficiency and mechanical efficiency.

Due to the above reasons, the performance of the water pump becomes poor. The operating efficiency is reduced by 2 ~ 5%, and the pump efficiency can be reduced by more than 10% in serious cases.