How to improve the anti cavitation performance of centrifugal pumps?

Improving the anti cavitation performance of centrifugal pumps helps to extend their service life. So, what measures can be taken to improve the anti cavitation performance of centrifugal pumps? Experts in centrifugal pumps propose two suggestions: (1) increase the effective cavitation margin of the inlet device; (2) Improve the anti cavitation performance of the centrifugal pump itself.
1, Measures to improve the effective cavitation margin of the liquid inlet device:
1. Change the suction device to a backflow device.
2. Reduce the installation height of the suction device centrifugal pump.
3. Increase the pressure of the liquid level in the storage tank before the centrifugal pump to increase the effective cavitation margin.
4. Reduce the flow loss on the front pipeline of the centrifugal pump. Try to shorten the pipeline within the required range, reduce the flow rate in the pipeline, reduce bends and valves, and increase valve opening as much as possible.
2, Measures to improve the anti cavitation performance of centrifugal pumps themselves:
1. Adopting a front inducer to advance the work of the liquid flow in the front inducer to increase the pressure of the liquid flow.
2. By using a double suction impeller, the liquid flow enters the impeller from both sides simultaneously, doubling the inlet cross-section and reducing the inlet flow rate by one.
3. Use anti cavitation materials. Practice has shown that the higher the strength, hardness, and toughness of materials, the better their chemical stability, and the stronger their resistance to cavitation.
4. The design working condition adopts a slightly larger positive angle of attack to increase the blade inlet angle, reduce the bending at the blade inlet, reduce blade blockage, and increase the inlet area; Improve working conditions under high flow rates to reduce flow losses. But the positive angle of attack should not be too large, otherwise it will affect efficiency.
5. Improve the structural design of the suction port near the impeller of the centrifugal pump. Increase the overcurrent area; Increase the curvature radius of the inlet section of the impeller cover plate to reduce the rapid acceleration and pressure drop of the liquid flow; Properly reducing the thickness of the blade inlet and rounding the blade inlet to approach a streamline shape can also reduce the acceleration and pressure drop around the blade head; Improve the surface smoothness of the impeller and blade inlet to reduce resistance loss; Extend the inlet edge of the blade towards the inlet of the impeller to allow the liquid flow to receive work in advance and increase pressure.
The above measures can be comprehensively analyzed and appropriately applied based on the selection of centrifugal pumps, materials, and the on-site use of centrifugal pumps.