The pump is composed of rotor 1, stator 2, blade 3, oil distribution plate and end cover. The inner surface of the stator is a cylindrical bore. There is eccentricity between the rotor and the stator. The blades can slide flexibly in the slots of the rotor. Under the action of the centrifugal force when the rotor rotates and the pressure oil flowing into the root of the blades, the top of the blades is close to the inner surface of the stator, so the two adjacent blades, oil distribution plate, stator and rotor Each sealed working chamber is formed. When the rotor rotates counterclockwise, the blades on the right side of the figure extend outward, and the volume of the sealed working chamber gradually increases, creating a vacuum, and then the oil is sucked in through the oil suction port 6 and the upper window of the oil distribution plate 5. And on the left side of the figure. The vane retracts inward, the volume of the sealing cavity gradually decreases, and the oil in the sealing cavity is pressed out through the other window of the oil distribution plate and the oil pressure port 1, and then output to the system. This kind of pump absorbs oil and pressurizes oil once during one rotation of the rotor, so it is called a single-acting pump. The rotor is subject to radial hydraulic unbalanced force, so it is also called an unbalanced pump, and its bearing load is relatively large. Changing the eccentricity between the stator and the rotor can change the displacement of the pump, so this type of pump is a variable pump.
