Different types of vacuum pumps have different functions and working principles, and the specific processes used are different. In this paper, the specific functions of various vacuum pumps are described as follows:
1. The working principle of Roots vacuum pump is: it has a pair of soled rotors with synchronous high-speed rotation, because of the continuous rotation of the rotors, The extracted gas is sucked into the gap between the rotor and the pump shell from the air inlet and discharged through the exhaust port. Since the gap is completely closed after suction, the gas in the pump cavity is not compressed and expanded. However, when the top of the rotor turns around the edge of the exhaust port and the gap is connected with the exhaust side, because of the high pressure of the gas in the exhaust side, a part of the gas in the side flows back into the gap, making the gas When the rotor continues to turn to the outlet, the gas is discharged out of the pump.
2. The function principle of water ring vacuum pump is: the impeller is eccentrically installed in the nearly circular pump body. When the impeller rotates clockwise, the water injected into the pump body forms a rotating water ring due to the centrifugal effect, and a crescent shaped space is formed between the inner surface of the water ring and the impeller hub. When the space increases, the gas is inhaled from the outside. When the impeller continues to rotate, the corresponding space becomes smaller, and the original suction is made When the pressure reaches or slightly exceeds the gas pressure, the gas is discharged.
3. The working principle of reciprocating vacuum pump is: it uses the reciprocating motion of piston to pump air. This kind of pump has poor continuity and is relatively simple.
4. The principle of the steam jet pump is: the medium pressure steam of 8-12kg / cm2 is expanded through the heat insulation of the nozzle, the speed is increased to more than 1000m / s, the secondary steam and non condensable gas are sucked into the mixing chamber, after the secondary steam and non condensable gas are sucked and mixed with medium pressure steam, the speed is increased to about 200m / s, the medium pressure steam carrier inhales the steam into the diffuser, and the mixed steam is compressed and decompressed in the compressor After that, discharge the pump. The imported steam jet pump has high concentricity, good material and ingenious nozzle design. At present, the domestic steam jet production technology cannot be compared with the imported advanced steam jet.
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