A rotary vane vacuum pump can be an oil-sealed rotary displacement pump. The pumping program consists of a casing (1), an eccentrically installed rotor (2), vanes that move radially under spring push (3) and the inlet and outlet (4). … The Rotor techniques by using a motor attached to it.
Uses. Vane pumps are generally used as high-pressure hydraulic pumps and in automobiles, including supercharging, power-steering, air-con and automatic-transmitting pumps. Pumps for mid-range pressures include applications such as carbonators for fountain soft-drink dispensers and espresso espresso machines.
The simplest vane pump includes a circular rotor rotating inside a bigger circular cavity. The centers of these two circles are offset, causing eccentricity. … The actions 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).