The Principle of Rotary Vane Vacuum Pump

_{Rotary vane pump rotor, pump chamber and two end caps surrounded by the crescent-shaped space separated into 1, 2, 3 three parts, when the rotor rotates in the direction of the arrow, and the suction port is connected to the volume of space 1 is gradually increasing, is in the suction process. The volume of the space C connected with the exhaust port is gradually shrinking and is in the process of exhaust. The volume of the centered space 2 is also decreasing and is in the process of compression. As the volume of space 1 gradually increases (i.e., expands), the gas pressure decreases, and the external gas pressure at the inlet of the pump is greater than that in space 1, so the gas is drawn in. When space 1 is isolated from the suction port, i.e. turned to the position of space 2, the gas begins to be compressed, the volume is gradually reduced, and finally connected to the exhaust port. When the compressed gas exceeds the exhaust pressure, the exhaust valve is pushed open by the compressed gas, and the gas is discharged to the atmosphere through the oil layer in the tank. The purpose of continuous pumping is achieved by the continuous operation of the pump. If the discharged gas passes through the airway and is transferred to another stage (low vacuum stage), pumped away by the low vacuum stage, and then compressed by the low vacuum stage and discharged to the atmosphere, i.e., it is composed of a two-stage pump.}