How to improve the anti cavitation performance of the centrifugal pump?
As we all know, when there is air in the centrifugal pump shell, a smaller centrifugal force is generated, because the density of air is much smaller than the density of liquid. Therefore, the pressure difference between the liquid level above the storage tank and the suction port of the pump is not enough to press the liquid in the storage tank into the pump, that is, the centrifugal pump has no self-priming capacity, so that the centrifugal pump cannot deliver liquid, which is called "cavitation phenomenon". How to improve the anti cavitation performance of the centrifugal pump? What's the key?
The key to improve the cavitation resistance of centrifugal pump itself:
(1) The structure design from the suction port of centrifugal pump to the impeller is improved. Increase the flow area, increase the curvature radius of the impeller cover plate inlet section, reduce the sharp acceleration and pressure drop of the liquid flow, properly reduce the thickness of the blade inlet, and round the blade inlet to make it close to the streamline shape, also can reduce the acceleration and pressure drop of the flow around the blade head, improve the surface finish of the impeller and the blade inlet section to reduce the resistance loss; The inlet edge of the blade is extended to the inlet of the impeller to make the liquid flow receive the work ahead of time and increase the pressure.
（2） The front inducer is used to make the liquid flow work ahead of time in the front inducer, so as to improve the liquid flow pressure.
(3) If the double suction impeller is used to let the liquid flow into the impeller from both sides of the impeller at the same time, the inlet section will be doubled and the inlet flow rate will be doubled.
(4) In order to increase the inlet angle of the blade, reduce the bending at the inlet of the blade, reduce the blockage of the blade, increase the inlet area, and improve the working conditions under large flow to reduce the flow loss. But the positive impact angle should not be too large, otherwise it will affect the efficiency.
(5) Use anti cavitation materials. The results show that the higher the strength, hardness and toughness, the better the chemical stability and the stronger the cavitation resistance.
