In recent years, a new type of vacuum pump has been developed, which can be realized with only one pump, from atmospheric pressure to high vacuum. But generally speaking, in order to obtain high vacuum, ultra-high vacuum and ultra-high vacuum, a series of vacuum pumps are used to complete the pumping task. Therefore, it is very important for the user to know the working principle, main performance, structural characteristics and classification of the pump.
Vacuum pump is a device used to produce, improve and maintain vacuum. According to its working principle, it is basically divided into two types: gas transfer pump and gas capture pump. The gas transfer pump is a vacuum pump which can make the gas continuously inhale and discharge out of the pump to reach the suction port. This kind of gas transfer pump includes two kinds: positive displacement pump and momentum transfer pump.
1. Positive displacement vacuum pump
The volume vacuum pump is a device that uses the periodic change of the volume of the pump cavity to complete suction, compression and exhaust. The gas is compressed before being discharged. This kind of pump is divided into reciprocating type and rotary type.
(1) Reciprocating vacuum pump uses the reciprocating motion of the piston in the pump cavity to draw in, compress and discharge the gas. Therefore, it is also called piston vacuum pump.
(2) Rotary vacuum pump uses the rotary motion of the piston in the pump cavity to suck, compress and discharge the gas. There are many kinds of pumps of this kind.
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