Working principle of rotary vane vacuum pump
Dec 19, 2022
Rotary vane vacuum pumps are mostly small and medium-sized vacuum pumps. There are two types of rotary vane vacuum pumps: single-stage rotary vane vacuum pumps and two-stage vacuum pumps. The so-called two-stage rotary vane vacuum pump is to connect two single-stage pumps in series structurally. Generally, it is made into two stages to obtain a higher vacuum degree.
The relationship between the pumping speed and the inlet pressure of the rotary vane vacuum pump is stipulated as follows: when the inlet pressure is 1333Pa, 1.33Pa and 1.33×10-1 (Pa), the pumping speed value shall not be lower than 95% of the nominal pumping speed of the pump. , 50% and 20%.
Two-stage pump It consists of two single-stage pumps connected in series. When working, the pumped gas first enters the high vacuum stage through the suction cylinder. When the pressure of the inhaled gas is high, a part of the gas is discharged by the exhaust valve 2, and the other part of the gas is discharged by the exhaust valve 1 through the low vacuum stage. When the pressure of the inhaled gas is low, although it is compressed in the high vacuum stage, the exhaust valve 2 cannot be opened to exhaust, and it can only continue to be compressed through the low vacuum stage, and then it is discharged from the exhaust valve 1, because of the limit vacuum ratio of the two-stage pump. Single stage pump height.
