A rotary vane vacuum pump can be 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 store (4). … The Rotor moves by using 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-transmitting pumps. Pumps for mid-range pressures consist of applications such as for example carbonators for fountain soft-drink dispensers and espresso coffee machines.
The simplest vane pump has a circular rotor rotating inside a bigger circular cavity. The centers of the two circles are offset, leading to eccentricity. … The actions of the vane drives out the same volume of fluid with each rotation. Multistage rotary-vane vacuum pumps can attain pressures only 10 mbar (0.0001 Pa).