A rotary vane vacuum pump is an oil-sealed rotary displacement pump. The pumping program consists of a casing (1), an eccentrically set up rotor (2), vanes that move radially under spring pressure (3) 
and the inlet and wall plug (4). … The Rotor techniques with the help of a motor mounted on it.
Uses. Vane pumps are generally used as high-pressure hydraulic pumps and in automobiles, including supercharging, power-steering, air conditioning and automatic-transmission pumps. Pumps for mid-range pressures include applications such as for example carbonators for fountain soft-drink dispensers and espresso espresso machines.
The easiest vane pump has a circular rotor rotating inside a bigger circular cavity. The centers of these two circles are offset, leading to eccentricity. … The action of the vane drives out the same level of liquid with each rotation. Multistage rotary-vane vacuum pumps can attain pressures as low as 10 mbar (0.0001 Pa).