Vibration Analysis And Structural Improvement Of Sliding Valve Vacuum Pump

With the steady development of the economy, the demand of vacuum pump is growing. In the vacuum operational area such as vacuum smelting, vacuum drying, vacuum coating, vacuum impregnation, vacuum pump has been widely used.The rotary piston vacuum pump discussed in this paper is a mechanical oil-sealed vacuum pump. It is used to change the slide valve structure to achieve a vacuum suction chamber volume, so that it is called the rotary piston vacuum pump. Due to structural characteristics, the pump has large volumes, so, it is often used in large equipment. It can be used alone, or serve as a pump before the pump. However, this pump has a large eccentricity of the rotor, rotational inertia force is generated when running. At this point, the system will generate large movement vibration and noise. Currently, the general balance of the rotational inertia force can be basically achieved. However, the slide valve centroid trajectory shapes are complex. They are approximate oval closed curve. Thus, it is difficult to achieve the balance of inertia force. The main purpose of this project is to analyze the vibration of slide valve vacuum pump, the noise problems of the vacuum pump. Take effective measures to reduce the vibration and noise of vacuum pump, improve the. long-running reliability of rotary piston pump.In this paper, we describe the research status, development trends, works and the structural characteristics of the rotary piston vacuum pump when the vacuum pump is running. We analyzed the vibration force variation to shaft generated by the movement of slide valve and the vibration force variation to pump body generated by the slide valve guide. Based on the mass balance principle, paper derived the balancing equations, including the relationship between the quality and location of the eccentric wheels, the mass calculation method and installation location of the weights. According to the results, the balance of inertial force can be achieved.In this paper, we improve the existing vacuum pump structure and propose a new slide valve vacuum pump structure. Through theoretical calculation and analysis, reasonable structure and geometrical parameters has been selected. Through the virtual prototyping software, we contrast the simulation tests of the two structures. We can see that the new structure weaken the vibration force to the rotary piston pump from the principle and ensure a smooth and efficient operation of the rotary piston pump.