How to reduce the cavitation margin of acid and alkali resistant chemical pumps?

　　Vaporization pressure refers to the liquid at the inlet of the acid and alkali pump because of a certain vacuum pressure into a vapor, and then under the impact movement of the liquid mass, the impeller and other metal surfaces produced by the stripping, thus destroying the metal and other impellers, the vacuum pressure at this time is also called the vaporization pressure, the margin of corrosion refers to the pump in the suction port out of the unit weight of the liquid has more than the vaporization pressure of the surplus energy.

　　Measures to improve the effective cavitation margin of the immersion device

　　1. Increase the pressure of the liquid level in the storage tank before the chemical pump to improve the effective margin of corrosion

　　2. Reduce the suction device pump installation height

　　3. Change the upper suction device into a pouring device

　　4. Reduce the flow loss on the pipeline before the pump, such as minimizing the pipeline in the required range in order to reduce the flow rate in the pipeline, reduce the bends and valves, and try to open the valve opening and closing degree.

　　5. Reduce the chemical pump inlet medium temperature (when the medium temperature is close to the saturation temperature)

　　Measures to improve the pump itself anti-cavitation performance

　　1. Improve the corrosion-resistant chemical pump suction port to the impeller near the structural design, increase the overflow area; increase the radius of curvature of the impeller cover inlet section, reduce the liquid flow rapid acceleration and depressurization, appropriate reduction of the thickness of the vane inlet, the vane inlet trimmed into a streamlined shape, you can reduce the acceleration around the head of the vane and the depressurization, to improve the impeller and vane imports of the part of the surface finish, so as to reduce the resistance to bring losses Extend the vane inlet side of the acid and alkali chemical pump towards the vane inlet, so that the liquid flow receives the work in advance, and improve the pressure.

　　2. Adopting front induced wheel, making the liquid flow in the front induced wheel to do work in advance, in order to improve the pressure of the liquid flow.

　　3. According to the working condition, adopt larger positive impulse angle, in order to increase the blade inlet angle, the blade inlet completely, reduce the blade blockage, in order to increase the inlet area, improve the working condition under the large flow rate, in order to reduce the flow loss, but the positive impulse angle should not be too large, otherwise it will affect the efficiency of the work

　　4. Adopt the material of anti-vapor corrosion, practice shows that the higher the strength, hardness and toughness of the material, the better the chemical stability, the stronger the ability of anti-vapor corrosion.