Rotary vane pumps are used by many industries such as small and large manufacturers, and by individual craftsmen and designers. They play a role in production and handling of materials at every stage from the formation of raw materials to handling and packaging of finished products. These pumps are crucial to a large number of products. Still, there are those who really don’t know what a rotary vacuum pump is. Others end up buying a two stage rotary vane vacuum pump for their own usage.
The pumps may be oil sealed or dry rotary displacement pump. The pumps are both made in single or two stage rotary vane vacuum pump versions. Depending on the users’ needs, they can decide which ones can make itself best for applications. Usually the two-stage pump will achieve lower pressure as compared to a single-stage pump. To know which ones suit your needs, you can consult an expert in the field.
Generally, the basic design of a rotary vane vacuum system includes an outlet, inlet, vanes that converge to a common center under spring force, the installed rotor, and pump housing. The housing has two openings: the inlet valve is designed as a vacuum safety valve, while the outlet valve is oil-sealed. The inlet valve is always open during the whole operation. They are found inside a working chamber situated inside the housing.
The rotor and the vanes separate the working chamber into two divided spaces that have different volumes. When the rotor turns it, the trapped gas flows suction the chamber tillit seals-off the second vane. After which, the surrounded gas is stoppedtillthe outlet valve opens straightened with atmospheric pressure. In a gas ballast operation, the outside hole is then opened to empty the sealed suction chamber at the front side of the pump. This also works with a two stage rotary vane vacuum pump as expected.
Vacuum safety valve can equip few types of rotary vane pumps as well. It can disconnect the pump from the vacuum recipient if there is a deliberate or not deliberate stoppage. Oil rising into the recipient is prevented through a displaced gas of the vent. Then, when the pump starts, it opens after the stoppage once the pressure in the pump has again reached the same pressure in the recipient.