working principle Its working principle is the same as that of the general volumetric pump. It consists of main parts such as stator, rotor, rotary vane, cylinder and motor. The rotor with the rotary vane is eccentrically mounted in the fixed cylinder. When the rotor rotates at high speed, the four radial sliding vanes in the rotor slot divide the pump chamber into four working chambers. Due to the centrifugal force, the rotary vane is closely attached. The cylinder wall separates the stator inlet and outlet ports, and starts to operate again and again to change the volume. The inhaled gas is discharged from the exhaust port to achieve the purpose of pumping. Structural features The oil-free direct-coupled rotary vane vacuum pump is a rotary vane single-stage vacuum pump. A basic device used to remove gas from a sealed container to obtain a vacuum. The pump can be used for various vacuum operations such as air conditioning, refrigeration equipment repair, suction equipment for medical equipment, printing machinery, vacuum packaging, vacuum absorbing, physical and chemical experiments, and small devices requiring a vacuum environment. It can also be used as a foreline pump for small oil booster pumps, oil diffusion pumps, molecular pumps, etc. This pump is not suitable for the removal of gases that are corrosive to ferrous metals, chemically reactive to pump oil, gases containing particulate dust, and toxic gases that are too high in oxygen and explosive. It cannot be used as a transfer pump (ie, pumping from one container to another).