Solutions and maintenance measures for cavitation in self suction centrifugal pumps

（1） Solutions to cavitation in self suction centrifugal pumps: The phenomenon of cavitation is generally difficult to avoid. If the design of self suction centrifugal pumps is reasonable, it can to some extent delay the occurrence of cavitation. In addition, using materials with higher hardness can also slow down the corrosion effect of cavitation. The fundamental measure to reduce cavitation in self suction centrifugal pumps should be to improve their own resistance to cavitation

During use, attention should be paid to the daily operation and maintenance of the self suction centrifugal oil pump, which can improve work efficiency and slow down the occurrence of cavitation

(1) Reasonably calculate the installation elevation of the self suction centrifugal pump according to the formula

(2) The water flow velocity in the storage tank should be gentle and should not have large vortices or backflow. In addition, debris and sludge in the water storage tank should be cleaned up in a timely manner to ensure smooth water flow and balanced flow velocity

(3) The inlet pipeline should be as short as possible, and unnecessary components should be reduced. The diameter of the pipeline should be increased as much as possible to reduce the flow loss of the inlet pipeline. To ensure a uniform distribution of water flow velocity and pressure at the inlet of a self suction centrifugal pump, the horizontal length of the inlet pipeline should not be too short to prevent backflow and vortices of water flow

(4) When the self suction centrifugal pump is working, appropriate adjustment measures can be taken according to the specific situation to adjust the parameters of the self suction centrifugal pump, preventing the operating parameters of the self suction centrifugal pump from deviating significantly from its design range

(5) Enhance the inlet pressure of the self suction centrifugal pump to increase its cavitation margin, such as expanding the diameter of the outlet of the self suction centrifugal pump, and use auxiliary devices for pressurization to reduce the harm caused by cavitation

(6) Control the impurities and sediment content in the water source. If there are many impurities in the water, it will intensify the wear of the flow components and exacerbate the cavitation phenomenon of the self suction centrifugal pump. Therefore, measures should be taken to purify the water quality of water sources with high levels of impurities

(7) Improve the machining accuracy of the impeller and flow components. The higher the smoothness of the impeller surface and other flow components of a self suction centrifugal pump, the better its anti cavitation performance, and the less likely it is that cavitation will occur

(8) Strengthen the daily maintenance of self suction centrifugal pumps. If the flow components of the self suction centrifugal pump have corroded, anti-corrosion coatings can be used for repair treatment. Timely repair of impellers can greatly improve their corrosion and friction resistance, prolong their service life, and improve the performance and efficiency of self suction centrifugal pumps

(9) Try to reduce the operating speed of the self suction centrifugal pump as much as possible. Its cavitation performance is directly proportional to the square of the pump speed. Reducing the speed of a self suction centrifugal pump can to some extent slow down the occurrence of cavitation phenomenon

(10) Adding an appropriate amount of air to the self suction centrifugal pump can reduce the destructive force of bubble rupture, lower the vacuum degree inside the pump, and thus weaken the harm of cavitation. But the amount of air added should not be too much, otherwise it will affect the performance of the self suction centrifugal pump

(II) Maintenance Measures for Self suction Centrifugal Pumps Used in Chemical Enterprises

1. Strengthen the Maintenance and Management of Self suction Centrifugal Pumps

The working environment of Self suction centrifugal pump equipment in chemical wastewater treatment is much worse than that of other mechanical equipment, and some self suction centrifugal pumps work in wastewater.

. In order to ensure the operational stability of self suction centrifugal pumps, relevant management personnel should strengthen the management of maintenance for self suction centrifugal pumps. For non operating equipment, timely maintenance and storage management should be carried out to avoid corrosion or other damage; And for the operation status, it is necessary to constantly check its working status. Once any abnormal conditions are found, they should be reported for maintenance in a timely manner to avoid the expansion of faults

2. Strengthen the maintenance management of self-priming centrifugal pumps

In chemical production, many self-priming centrifugal pumps work under overload. It is common for some malfunctioning self-priming centrifugal pumps to not be repaired in a timely manner or to continue working due to faults.

. Due to the increasing demand pressure in industrial production, production equipment such as self suction centrifugal pumps are operating at overload, so the implementation of maintenance and management work for self suction centrifugal pumps is not very good. Therefore, in order to ensure the long-term operation of self suction centrifugal pumps, it is necessary to conduct regular maintenance and management of self suction centrifugal pumps, develop a comprehensive maintenance and management plan, ensure that the equipment does not stop running, reduce maintenance costs, and improve the production efficiency of chemical enterprises

3. Strengthen the management of operators of self suction centrifugal pumps

For the operation of mechanical equipment such as self suction centrifugal pumps, many operators have incorrect attitudes and methods. Therefore, in the actual operation process of sewage treatment in chemical enterprises, mechanical equipment failures often occur due to operational errors. In order to help workers adjust their attitude and operate mechanical equipment correctly, regular training on operational knowledge should be provided to operators to enhance their understanding of the operating status and basic structure of mechanical equipment, and to reduce the occurrence of operational errors.