Ten measures to solve the cavitation phenomenon of Magnetic pump.

The cavitation phenomenon of chemical magnetic pump usually refers to the phenomenon of cave corrosion on the metal surface in contact with fluid under the condition of high speed flow and pressure change. The cavitation phenomenon of the chemical magnetic pump is mainly determined by the cavitation performance of the chemical magnetic pump itself and the operating conditions of the device.

1. When reasonably determining the installation elevation of the chemical magnetic pump, the installation elevation should be calculated correctly according to the formula for calculating the installation elevation of the chemical magnetic pump.

2. In a well-designed intake pool, the flow in the intake pool should be stable and uniform, without whirlpool and bias, otherwise the cavitation performance of the chemical magnetic pump will become bad. therefore, the shape and size of the intake pool should meet the requirements of stable and uniform flow. In addition, it is necessary to remove the dirt and silt from the intake pool in time to make the water flow smooth and uniform, and to maintain a sufficient submergence depth of the intake horn day.

3. The selection of a reasonable intake pipe should be as short as possible, reduce unnecessary pipe accessories and appropriately increase the pipe diameter so as to reduce the head loss of the inlet pipe. In order to make the flow velocity and pressure distribution at the entrance of the chemical magnetic pump uniform, for the horizontal chemical magnetic pump, the length of the horizontal straight section of the forward water pipe at the inlet of the chemical magnetic pump should not be too short, usually not less than 4 to 5 times the diameter of the inlet pipe. The type, structure and size of the intake passage of large and medium-sized pumping stations should be designed reasonably, maintain interesting and good hydraulic conditions, and prevent the occurrence of harmful bias current and whirlpool.

4. Try to make the chemical magnetic pump run in the operation of the chemical magnetic pump near the design working condition. according to the specific conditions of the pumping station, appropriate regulation measures can be adopted to adjust the operating condition of the chemical magnetic pump so as to prevent the pump from deviating far from the design working condition. For the chemical magnetic pump, the flow rate can be appropriately reduced to make the operating point move to the left; for the axial flow pump, the operating point can be moved to (NPsH), where the value is small.

5. Increase the pressure at the entrance of the chemical magnetic pump to pressurize the inlet pipe of the chemical magnetic pump, such as introducing the water from the outlet pipe of the chemical magnetic pump into the inlet pipe and pressurizing it with nozzles to reduce the harm of cavitation.

6. The pumping station which controls the sediment content of the water source and draws water from the sediment-laden river will aggravate the wear of the overflowing parts and worsen the water absorption performance of the pump because of the high sediment content in the water. Therefore, for the sediment-laden flow, certain sediment prevention measures must be taken to reduce the sediment content of the flow, and wear-resistant pumps such as wear-resistant slurry pumps should also be selected.

7. Improve the surface finish of impellers and overflowing parts the higher the finish of the impeller surface and other overflowing parts of the chemical magnetic pump, the better the cavitation resistance, the less the possibility of cavitation.

8. Timely coating and repair if the overflowing parts of the chemical magnetic pump have been exfoliated, metal or non-metallic materials can be applied and repaired in time. After coating and repairing, the ability of anti-denudation and anti-wear of the impeller will be greatly improved, which will not only prolong the service life of the impeller, but also improve the efficiency of the pump.

9. Reducing the rotational speed and water absorption performance of the chemical magnetic pump is proportional to the square of the rotational speed, and reducing the rotational speed of the chemical magnetic pump can reduce the harm of cavitation.

10. The air supply in the cavitation area and the appropriate amount of air on the inlet side of the chemical magnetic pump can alleviate the impact force of bubble bursting and reduce the vacuum in the cavitation area so as to reduce the harm of cavitation. However, the amount of air intake should be appropriate, otherwise the water absorption performance of the chemical magnetic pump will become worse, so we must be cautious in using this method.