Rotary vane vacuum pump belongs to variable volume vacuum pump, which is a vacuum pump that is equipped with a biased rotor that rotates in the pump chamber, causing periodic changes in the volume of the pump chamber chamber separated by the rotary vane to achieve air extraction. Rotary vane vacuum pumps are divided into single-stage rotary vane vacuum pumps and two-stage rotary vane vacuum pumps. What are the differences between the two?
Compared to a single stage rotary vane vacuum pump, a double stage rotary vane vacuum pump is structurally composed of two single stage pumps connected in series. Therefore, a single stage rotary vane vacuum pump only has one working chamber, while a double stage rotary vane vacuum pump that is connected in series by two single stage pumps naturally consists of two working chambers, which are connected in series before and after, rotating at the same speed in the same direction. Thus achieving higher vacuum levels. A double stage vacuum pump can operate at lower pressures, typically reaching a vacuum degree of 0.1 mbar. At the same time, the effective fractionation effect in the two-stage rotary vane vacuum pump makes it more suitable for working at low pressure (below 1 Torr).
In terms of working principle, there is no difference between a double stage rotary vane vacuum pump and a single stage rotary vane vacuum pump. In terms of structural form, the exhaust compression ratio of a double stage rotary vane vacuum pump is higher than that of a single stage rotary vane pump. Therefore, the ultimate vacuum degree of a double stage rotary vane vacuum pump is higher than that of a single stage rotary vane vacuum pump, but it is more expensive than a single stage rotary vane vacuum pump.
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Post time: Aug-17-2023