Introduction To Vane Vacuum Pumps

The rotor is a cylinder with radial grooves, in which vanes are placed and can slide freely. The rotor is eccentrically mounted within the pump body. When the rotor is driven to rotate by a prime mover, the vanes are pressed tightly against the inner wall of the pump body by centrifugal force or spring force. During the first half of the rotor's rotation, the space enclosed by adjacent vanes gradually increases, creating a partial vacuum and drawing in liquid. During the second half of the rotation, this space gradually decreases, compressing the liquid and forcing it into the discharge pipe. Based on the vane installation position, pumps are classified as internal vane pumps (vanes mounted on the rotor) and external vane pumps (vanes mounted on the pump body). They are widely used in the petrochemical industry for oil depot tank transfers, tanker unloading, train cleaning, and vacuum system bottom oil extraction. They can transport flammable and explosive media such as gasoline, diesel, propane, toluene, and propylene, as well as non-lubricating solvents; the gas-liquid mixing ratio can reach 50%, completely solving the problems of gas resistance and cavitation in the loading arms of tanker trucks.