A rotary vane vacuum pump is an oil-sealed rotary displacement pump. The pumping system consists of a housing (1), an eccentrically set up rotor (2), vanes that move radially under spring drive (3) and the inlet and store (4). … The Rotor 
movements with the aid of a motor mounted on it.
Uses. Vane pumps are commonly used as high-pressure hydraulic pumps and in automobiles, including supercharging, power-steering, air-con and automatic-tranny 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 includes a circular rotor rotating inside a larger circular cavity. The centers of the two circles are offset, leading to eccentricity. … The action of the vane drives out the same volume of fluid with each rotation. Multistage rotary-vane vacuum pumps can attain pressures as low as 10 mbar (0.0001 Pa).