With the development of vacuum application, there have been many kinds of vacuum pumps, with the pumping speed ranging from a few tenths of a liter per second to hundreds of thousands and millions of liters per second.
As vacuum application technology in the field of production and scientific research to the requirements of the application scope of the pressure is more and more wide, mostly need consists of several common after extraction of vacuum pump vacuum extraction system can meet the requirements of production and scientific research process, because the vacuum application department involved in the work pressure range is very wide, so any one type of vacuum pump could not fully apply to all working pressure range, can only work according to the different pressure range and different work requirements, using different types of vacuum pump.For the convenience of use and the requirements of various vacuum processes, various vacuum pumps are sometimes combined according to their performance requirements and applied in the form of units.
Gas transfer pump
The gas transfer pump is a vacuum pump which can make the gas continuously inhale and exhale, so as to achieve the purpose of air extraction.Can be divided into variable volume vacuum pump and momentum transfer pump.
Transcapacitance vacuum pump is a vacuum pump which USES the periodic change of pump chamber volume to complete the process of suction and exhaust.The gas is compressed before being discharged.The pump is divided into reciprocating and rotary pumps.The momentum transfer pump depends on the high-speed rotating blade or high-speed jet, which transfers momentum to the gas or gas molecules, so that the gas is continuously transmitted from the pump inlet to the outlet.It can be divided into five types: molecular vacuum pump, jet vacuum pump, diffusion pump, diffusion jet pump and ion transfer pump.
Trapping gas pump
Trapping gas pump is a kind of vacuum pump that makes the gas molecules to be absorbed or condense on the inner surface of the pump, thus reducing the number of gas molecules in the container to achieve the purpose of air extraction. It can be divided into adsorption pump, getter pump, getter ion pump and cryogenic pump.