You must pay close attention to the occurrence of cavitation in stainless steel pumps. How to improve the resistance of stainless steel pumps to cavitation is explained in detail below:
1, Measures to increase the effective cavitation margin of the liquid inlet device:
(1) Replace the suction device with a backflow device.
(2) Reduce the installation height of the suction device pump.
(3) Increase the pressure of the liquid level in the storage tank before the pump to increase the effective cavitation margin.
(4) Reduce flow loss on the pipeline in front of the pump. Try to shorten the pipeline as much as possible within the required range, reduce the flow rate in the pipeline, minimize bends and valves, and increase the valve opening as much as possible.
2, Measures to improve the anti cavitation performance of centrifugal pumps:
(1) Improve the structural design of the pump's suction port to the vicinity of the impeller. 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; Appropriately reducing the thickness of the blade inlet and rounding it to 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 blade inlet edge towards the impeller inlet to allow the liquid flow to receive work in advance and increase pressure.
(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 velocity.
(3) By using a front induction wheel, the liquid flow can perform work in advance in the front induction wheel to increase the liquid flow pressure.
(4) Use materials that are resistant to cavitation. Practice has shown that the higher the strength, hardness, and toughness of a material, the better its chemical stability, and the stronger its resistance to cavitation.
(5) The design 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 conditions to reduce flow losses. But the positive angle of attack should not be too large, otherwise it will affect efficiency.
The above measures can be comprehensively analyzed and appropriately applied based on the selection, material selection, and on-site conditions of the pump.
