rotary vane mechanical vacuum pump working principle and precautions

The vacuum pump unit is used to extract the gas in the blocking system to obtain vacuum. At present, rotary vane vacuum pump unit is widely used in refrigeration maintenance work. It can pump the gas in the refrigeration system from 105Pa to below 1pA.

The rotor with two sliding blades is installed in the stator cavity. The outer circle of the rotor is tangent to the surface of the pump cavity. When the pump rotor rotates, the top of the rotating blade is in contact with the inner wall of the pump chamber by centripetal force and spring pressure. Driven by the motor, the eccentric rotor drives the vane to rotate in the stator cavity, which gradually expands the volume of the air inlet chamber. The air pressure drops and inhales gas. At the same time, the volume of the chamber connected with the exhaust port is gradually reduced, and the air pressure increases. After reaching a certain pressure, the exhaust valve is opened to discharge the gas, so as to achieve the purpose of extracting gas and obtaining vacuum.

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