On the horizontal multistage centrifugal pump efficiency decline, gear pump manufacturers a detailed overview is as follows: 1, dosing drugs or water quality before the pump and other reasons, so that the pump casing serious scale or corrosion. Serious pump casing can make the pump shell wall thickness increased by 2ram or so, and the horizontal multistage centrifugal pump wall scale formation of the tumor, the pump body volume reduced, the amount of pumping down, and the runner rough, increased head loss, passenger plot Both efficiency and hydraulic efficiency are reduced.
2, the erosion of water flow, horizontal multistage centrifugal pump wall and the impeller over the water surface becomes rough, the horizontal multi-stage centrifugal pump friction coefficient increases, together with water in the pump flow rate is very Large, head loss increases, reducing hydraulic efficiency. 3, Cavitation on the surface of the impeller. Due to the negative pressure generated when the blade is running on the surface of the water, when the pressure Pk, resulting in cavitation and honeycomb surface, under the action of electrochemical corrosion, pump cavitation. 4, Horizontal multistage centrifugal pump casting process caused by defects such as cavitation, erosion, corrosion and chemical etching causes cavitation or cracks in the pump flow path, the flow of water generated vortex caused by energy loss, hydraulic efficiency decreased. 5, volume loss and mechanical loss. Due to the long pump life, loss of mechanical wear and increased resistance, the volumetric efficiency and mechanical efficiency.
The above reasons, so that horizontal multistage centrifugal pump performance deterioration. Operating efficiency is reduced by 2 ~ 5%, serious horizontal multistage centrifugal pumps can reduce the efficiency of more than 10%.
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