Influencing Factors and Solutions of Cavitation Allowance in Self-balancing Multistage Centrifugal Pump

2024-09-09

Self-balancing multistage centrifugal pumpIs a commonly used industrial pump, widely used in various fields, but in the process of operation often appear cavitation problems, cavitation will lead to the efficiency of the pump, noise and pump body parts damage and other adverse effects, to understand the influence factors of cavitation and solutions, to ensure the normal operation of the pump and extend the service life of the pump is of great significance.

1. influencing factors

There are many factors that affect the cavitation margin of self-balancing multistage centrifugal pumps. The inlet pressure of the pump is an important factor, and a lower inlet pressure will increase the risk of cavitation. In addition, the liquid temperature and viscosity will also have an impact on the cavitation margin. The risk of cavitation increases when the liquid temperature is higher and the viscosity is lower. In addition, pump design parameters, such as impeller diameter, impeller number and blade angle, will also have an impact on cavitation. Some unreasonable design parameters may lead to the aggravation of cavitation problems. The cavitation margin of self-balancing multistage centrifugal pump is affected by many factors, mainly including the following aspects:

1. Fluid medium properties: such as the volatility, density and surface tension of the liquid, will affect the generation and accumulation of gas.

2. The geometric parameters of the pump: such as the diameter of the impeller, the shape of the blade and the inlet pressure of the pump, etc., affect the suction capacity and pressure distribution of the pump.

3. Operating conditions: such as pump speed, flow and temperature, etc., affect the gas production speed and pump delivery capacity.

4. Installation and maintenance status: The installation height of the pump, the design and maintenance of the piping system will also have an impact on the cavitation allowance.

2. Solution

There are also many ways to solve the cavitation problem of self-balancing multistage centrifugal pumps. The first is to increase the inlet pressure. By increasing the height of the inlet pipe or changing the shape of the inlet pipe, the inlet pressure can be increased and the possibility of cavitation can be reduced. The second is to adjust the temperature and viscosity of the liquid. The viscosity of the liquid can be changed by controlling the temperature of the liquid and adding additives, thereby reducing the risk of cavitation. In addition, the rational design of pump parameters is also an important method to solve the problem of cavitation. By optimizing parameters such as impeller diameter, impeller number and blade angle, the occurrence of cavitation can be reduced. The following measures can be taken to solve the cavitation margin problem of self-balancing multistage centrifugal pumps:

1. Optimize the properties of the medium: For highly volatile liquids, the volatility can be reduced by lowering the temperature or reducing other additives. For liquids with low surface tension, one can try to use surfactants to increase their surface tension.

2. Adjust the geometric parameters of the pump: increasing the diameter of the impeller or changing the shape of the blades can improve the suction capacity of the pump. At the same time, the inlet pressure distribution of the pump is optimized to avoid cavitation caused by low local pressure.

3. Adjust the operating parameters: reduce the speed of the pump or increase the flow rate, which can reduce the vaporization speed of the liquid. In addition, the operating temperature of the pump is controlled to avoid excessive temperature causing vaporization of the liquid.

4. Optimize installation and maintenance: ensure that the installation height of the pump is appropriate to avoid too low suction pressure. At the same time, regularly check and maintain the pipeline system to ensure that the system is unobstructed and avoid excessive pressure fluctuations in the pipeline.

5. Use anti-cavitation materials: For specific media and working conditions, you can choose to use materials with better anti-cavitation performance to make the impeller and pump body to improve the pump's resistance to cavitation.

The factors affecting the cavitation margin of self-balancing multistage centrifugal pump include inlet pressure, liquid temperature and viscosity, and pump design parameters. The methods to solve the cavitation problem mainly include increasing the inlet pressure, adjusting the liquid temperature and viscosity, and rationally designing the parameters of the pump. In practical applications, it is necessary to consider these factors comprehensively and take corresponding measures to ensure the normal operation of the pump and extend the service life of the pump.

In summary, to solve the problem of cavitation allowance of self-balancing multistage centrifugal pump, it is necessary to consider comprehensively from many aspects, such as optimizing the properties of the medium, adjusting the geometric and operating parameters of the pump, optimizing the installation and maintenance, and using anti-cavitation materials. To reduce the impact of cavitation on the pump.

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