A rotary vane vacuum pump can be an oil-sealed rotary displacement pump. The pumping system consists of a housing (1), an eccentrically installed rotor (2), vanes that move radially under spring push (3) and the inlet and wall plug (4). … The Rotor movements by using a motor attached to it.

Uses. Vane pumps are commonly 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 carbonators for fountain soft-drink dispensers and espresso coffee machines.

The easiest vane pump has a circular rotor rotating in the bigger circular cavity. The centers of these two circles are offset, causing eccentricity. … The actions of the vane drives out the same volume of liquid with each rotation. Multistage rotary-vane vacuum pumps can attain pressures as low as 10 mbar (0.0001 Pa).