Principle of rotary vane vacuum pump

Rotary vane pump rotary vane separates the crescent space enclosed by the rotor, pump chamber and two end covers into A, B, C three parts. When the rotor rotates in the direction of the arrow, the volume of space A connected with the suction mouth gradually increases, which is in the suction process.The volume of the space C connected with the exhaust port is gradually shrinking, and it is in the process of exhaust.The volume of middle space B is also gradually decreasing and is in the process of compression.

Since the volume of space A increases gradually (that is, expansion), the pressure of gas decreases, and the pressure of gas outside the inlet of the pump is greater than the pressure inside space A, so the gas is inhaled.When space A is isolated from the intake port, that is, when it moves to the position of space B, the gas begins to be compressed, the volume gradually decreases, and finally it is connected with the exhaust port.When the compressed gas exceeds the exhaust pressure, the exhaust valve is pushed open by the compressed gas, which is discharged into the atmosphere through the oil layer in the tank.By the continuous operation of the pump, to achieve the purpose of continuous pumping.If the discharged gas passes through the airway and is transferred to another stage (low vacuum stage), it is extracted by the low vacuum stage and compressed back to the atmosphere by the low vacuum stage, then a two-stage pump is formed.In this case, the total compression ratio is borne by the two stages, thus increasing the ultimate vacuum degree.

Performance characteristics of rotary vane vacuum pump

Rotary vane vacuum pump (referred to as rotary vane pump) is an oil seal type mechanical vacuum pump.Its working pressure range is 101325~1.33×10-2(Pa), belonging to the low vacuum pump.It can be used on its own or as a front stage pump for other high vacuum or ultra high vacuum pumps.It has been widely used in metallurgy, machinery, military industry, electronics, chemical industry, light industry, petroleum and pharmaceutical production and scientific research departments.

1. Small size, light weight and low noise;

2. Equipped with an air control valve to remove a small amount of water vapor;In the ambient temperature range of 5 ° C to 40 ° C, the inlet pressure is less than 1.3X103 pa under the condition of allowing long-term continuous operation, the relative humidity of the pumped gas is more than 90%, the air valve should be opened.

3, with automatic oil return check valve, easy to start;

4. The continuous and smooth atmospheric operation of the air intake shall not exceed one minute;

5. It is not suitable for removing the gas which is corrosive to metal, has chemical reaction to pump oil, and contains particles and dust, as well as the gas which contains too much oxygen, is explosive and poisonous.