What is the difference between single stage and double stage vane pumps

The rotary vane vacuum pump is a kind of variable volume mechanical vacuum pump which uses the rotary motion of rotor and the rotary vane which can slide in the rotor groove to obtain vacuum. When the working fluid is used to lubricate and fill the dead space of the pump cavity to separate the exhaust valve and the atmosphere, it is commonly known as the oil seal vane vacuum pump. When there is no working fluid, it is a dry rotary vane vacuum pump.

In the oil seal rotary vane vacuum pump, it is commonly known in China that the belt driven is rotary vane vacuum pump, while the pump directly connected with the motor or connected with the coupling is called direct rotary vane vacuum pump. In each pump, there are single-stage and two-stage. In the single-stage pump, the limit pressure and use of the pump are different because of the different structure and parameters.

Their common features are simple structure, convenient use, starting from atmospheric pressure, direct discharge to the atmosphere, small eccentric mass, easy maintenance, and improved pump structure to improve reliability.

In terms of pump structure, in order to prevent oil return when the pump stops, some pumps are equipped with check valves that can automatically cut off the oil circuit, some with shut-off valves for the air inlet channel, and some with oil pumps and control structures to automatically cut off the air circuit when the pump opens the gas town for operation and suddenly cuts off the power to keep the pump port in the state of vacuum vane vacuum pump. In terms of accessories, there are demister, odor filter, population filter, dust filter, steam condensation trap, chemical trap for blocking debris such as broken glass, etc., and there are control pump temperature to improve water vapor extraction rate and protect temperature control water volume of the pump.

The two-stage rotary vane vacuum pump can be widely used in refrigerator, air conditioner, bulb, fluorescent lamp, bottle container production, electronics, metallurgy, medicine, chemical industry, oil filter, printing machinery, packaging machine and other industries. It can be used as the pre-stage pump of diffusion pump, roots pump, molecular pump, etc., and it can be used for supporting and experimental research and application of electronic instruments, medical instruments, etc. Because the direct coupled pump has no dust pollution caused by belt friction, it is more widely used because of its small volume, light weight, material saving and increasingly perfect function.

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Rotary Vane Vacuum Pump