Rotary vane vacuum pumps

Design and Operating principle of a Rotary vane vacuum pumps :

A rotary vane vacuum pump is an oil-sealed rotary displacement pump. The pumping system includes an eccentrically installed rotor-2, a housing-1, vanes that move radially under spring force-3 and the inlet and outlet-4 . The inlet valve is designed as a vacuum safety valve that is always open in the course of operation. The outlet valve is oil-sealed, the working chamber-5 is located inside the housing, vanes along with rotor divide the working chamber into two different spaces having variable volumes. As the rotor turns, gas flows into the enlarging suction chamber until it's sealed off by the second vane. The enclosed gas is compressed until the outlet valve opens against atmospheric pressure, in the case of gas ballast operation, a hole to the outside is opened, which empties into the sealed suction chamber on the front side.

Multi-stage pumps :Rotary vane vacuum pumps are built in single- and two-stage versions. The functional diagram of two-stage is shown in the figure.

Two-stage pumps achieve lower ultimate pressures than single-stage pumps. Moreover, the effects of the gas ballast on the ultimate pressure are lower, as the ballast gas is only admitted in the second stage.

Rotary vane vacuum pumps are used in the machines that make delicious espresso drinks as well as dispense fizzy, soda pop. Those two machines use mid-range pressure, but these vacuum pumps can also accommodate high pressure as well.

Aside from, vane pumps are used as energy saving devices in dozens of applications, for more than thirty years they have been used in automotive transmissions.