Noise reduction method of slide valve vacuum pump

Slide valve vacuum pump is also a kind of vacuum pump widely used in many vacuum equipment. It has the advantages of high pumping speed, simple structure, reliable function and high vacuum degree, so it has become a product with large demand. However, the primary problem of the pump is that the noise and oscillation are relatively large, which will have a bad impact on the environment of the operating unit, and will damage the service life of the vacuum system. 

Therefore, it is of great significance to improve the noise and function of the slide valve vacuum pump and extend the working life and power. According to the literature [discussion on the noise mechanism of the slide valve vacuum pump], it is known that the main reason for the high noise of the slide valve pump is the impact of oil and gas. In order to reduce the impact noise of the slide valve vacuum pump, the method widely used in China is to reduce the impact by lowering the rotating speed of the slide valve pump. For example, if the rotation speed of h150 slide valve pump is changed from 540r / min to 480r / min, the noise can be reduced by more than 3dba.

However, under the condition of constant pumping speed of slide valve pump, decreasing the speed of pump means increasing the volume of pump, which is obviously not a scheme. Therefore, it is necessary to explore other useful methods to reduce noise. The reference [acoustic manual] indicates that sound is transmitted in the pipeline, and when the cross-sectional area of the pipeline changes, the acoustic impedance Z also changes. At the variable cross-section, due to the change of impedance, part of the incident sound wave will be reflected back to the original pipe, and then the incident sound wave will be attenuated to achieve the effect of noise elimination. In the exhaust system of the slide valve vacuum pump, the air flow section changes many times from the exhaust hole of the pump cavity to the exhaust pipe of the oil tank. Assuming that the sound attenuation function of the variable cross-section pipeline is reasonably used, the impact noise of the underground sliding valve vacuum pump can also be used.

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