rotary vane vacuum pump working principle and application

Most of the rotary vane vacuum pumps are small and medium vacuum pumps. There are two types of rotary vane vacuum pump: single stage rotary vane vacuum pump and double stage vacuum pump. The so-called two-stage rotary vane vacuum pump is to connect two single-stage pumps in series in structure. Generally, it is made of two-stage to obtain a higher vacuum. The relationship between the pumping speed and the inlet pressure of the rotary vane vacuum pump is as follows: under the inlet pressure of 1333pa, 1.33pa and 1.33 × 10-1 (PA), the pumping speed shall not be lower than 95%, 50% and 20% of the nominal pumping speed of the pump respectively.

The working principle of two-stage pump is composed of two single-stage pumps in series. During operation, the extracted gas enters the high vacuum stage through the suction tube first. When the suction gas pressure is high, one part of the gas is discharged by the exhaust valve 2, and the other part is discharged by the exhaust valve 1 through the low vacuum stage. When the suction pressure is low, though compressed by high vacuum level, exhaust valve 2 can't be opened for exhaust, so it can only be compressed by low vacuum level and discharged by exhaust valve 1, because the limit vacuum of two-stage pump is higher than that of single-stage pump.

Vacuum pump is widely used in metallurgy, machinery, military industry, electronics, chemical industry, light industry, petroleum, medicine and other production and scientific research departments. It has been widely used in food vacuum packaging and plastic industry vacuum forming. Paper conveying, vacuum fixture and vacuum suction in printing industry.

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