Reasons For The Decrease In Efficiency Of Sanitary Negative Pressure Pumps

Publish Time: 04/11 2025 Author: Site Editor Visit: 45

Sanitary Negative Pressure Pump has the characteristics of high efficiency, wide performance range, safe and stable operation, low noise, long life, easy installation and maintenance. It is used to transport clean water or other liquids with physical and chemical properties similar to water. It is mainly suitable for water supply and drainage of urban high-rise buildings and fire water, water supply and drainage of factories and mines, long-distance water delivery, water used in production process cycles, HVAC cycles, domestic water and other purposes.

Regarding the reasons for the decline in the efficiency of sanitary negative pressure pumps, the gear oil pump manufacturer has a detailed summary as follows:

1. The pump casing is seriously scaled or corroded due to the addition of drugs or water quality before the pump. Severe scale accumulation in the pump casing can increase the thickness of the pump casing wall by about 2ram, and the inner wall of the sanitary negative pressure pump forms a scale tumor, which reduces the volume of the pump body, reduces the amount of water pumped, and makes the flow channel rough, the head loss increases, and the passenger efficiency and hydraulic efficiency are reduced.
2. The scouring of water flow makes the inner wall of the flow channel of the sanitary negative pressure pump and the water surface of the impeller rough and uneven, and the friction coefficient of the flow channel of the sanitary negative pressure pump increases. In addition, the water flow rate in the pump is very high, the head loss increases, and the hydraulic efficiency decreases.
3. Cavitation on the impeller surface. Because the negative pressure is generated when the blade backs the water surface, when the pressure Pk, the cavitation and honeycomb surface are generated, and the pump blades are cavitated under the action of electrochemical corrosion.
4. Casting defects, cavitation, abrasion, corrosion and chemical etching caused by the processing technology of the sanitary negative pressure pump cause cavities or cracks in the pump flow channel, and vortices are generated when the water flows, causing energy loss and reduced hydraulic efficiency.
5. Volume loss and mechanical loss. Due to the long use of the pump, mechanical wear causes leakage and increased resistance, which reduces the volumetric efficiency and mechanical efficiency.
The above reasons make the performance of the sanitary negative pressure pump deteriorate. The operating efficiency is reduced by 2-5%, and the efficiency of the sanitary negative pressure pump can be reduced by more than 10% in severe cases.