Influence of position and size of inlet and outlet of vane vacuum pump on noise

 According to the experiment, the closer the exhaust port is to the upper tangent point, the lower the noise is. But too close, the performance of rotary vane vacuum pump is affected. 

In production, it is found that the exhaust port is small and the noise is small, otherwise it is also large, which indicates that the size of the exhaust port has a great influence on the noise. Nanguang machine factory has unique research in this field.

They noticed that the 2x side eccentric pump has high pressure and large amount of gas when starting at atmospheric pressure. The high and low vacuum chambers are used to exhaust at the same time, and most of the gas is discharged from the exhaust valve of the high vacuum chamber. Because the size of the exhaust port of the high vacuum chamber has no effect on the noise, and can reduce the exhaust pressure, the maximum compression work and the starting power, the area of the exhaust port of the high vacuum chamber should be larger. In normal operation, the exhaust valve of high vacuum chamber is closed, and the main factor affecting noise is exhaust valve of low vacuum chamber. Therefore, the exhaust port area of the low vacuum chamber should be smaller to reduce the noise, but if the exhaust port is too small, the exhaust pressure will increase and the power consumption will increase. Therefore, the size and location of the exhaust port are selected. Although these should be considered in the design and manufacture, the maintenance personnel should also pay attention to it, so as to improve the noisy pump in maintenance.

The principle of considering the position of air inlet in design is: the suction volume should be the largest, the volume utilization coefficient should be the largest, the air resistance should be small, etc.

When repairing the pump, pay attention to whether the air inlet filter screen is blocked and whether foreign matters such as metal and glass debris fall from the air inlet, otherwise the pump chamber will be damaged.

Roots Vacuum Pump Vibration Reduction Method

Dry Screw Vacuum Pump Operation Technology

Roots Vacuum Pump Relief Valve And Bypass Pipeline