As shown in the schematic diagram of the working principle of rotary vane pump, rotary vane pump is mainly composed of stator, rotor, rotary vane, fixed cover and spring. Its structure is the use of eccentrically mounted in the stator cavity rotor (the outer circle of the stator and the stator inner surface of the gap between the two is very small) and sliding within the rotor slot by spring tension and centrifugal force on the inner wall of the stator Of the two rotary blades, when the rotor rotates, always sliding along the inner wall of the stator. The two rotary plates separate the crescent-shaped space enclosed by the rotor, the stator cavity and the fixed cover into three parts of A, B and C. When the rotor is rotated in the direction of the drawing, the volume of the space A communicating with the air inlet Constantly increasing, the pressure in A space continues to decrease. When the pressure in A space is lower than the pressure in the pumped container, the drawn gas is continuously drawn into the suction chamber A according to the principle of gas pressure balance When in the process of breathing. Volume of B cavity space is gradually reduced, the pressure continues to increase, this time in compression. While the volume of the space C communicating with the exhaust port is further reduced and the pressure in the C space is further increased. When the pressure of the gas is greater than the pressure of the exhaust gas, the compressed gas pushes open the exhaust valve and the pumped gas keeps flowing Through the oil reservoir within the tank and discharged to the atmosphere in the continuous operation of the pump, the ongoing suction, compression, exhaust process, so as to achieve the purpose of continuous extraction. Exhaust valve immersed in the oil to prevent atmospheric air flow into the pump, the oil through the pump body clearance, oil hole and exhaust valve into the pump cavity, so that all the movement of the pump cavity surface covered with oil, forming a suction chamber and Exhaust chamber seal, while the oil is also filled with all the harmful space, in order to eliminate their impact on the ultimate vacuum. Rotary vane pump working principle Figure 1 - pump body; 2-vane; 3-rotor; 4-spring; 5- exhaust valve