The Working Principle of Vane Pump


When the vane pump rotor rotates, the vane is pressed a […]

When the vane pump rotor rotates, the vane is pressed against the inner surface of the stator by the centrifugal force and the pressure oil. The working volume formed by the two blades and the inner surface of the rotor and the stator is firstly drained from small to large and then drained from large to small. When the blade rotates one week, the oil absorption and the oil discharge are completed.

1. How single-acting vane pumps work

The pump consists of rotor 1, stator 2, vane 3, oil distribution plate and end cover. The inner surface of the stator is a cylindrical hole. There is eccentricity between the rotor and the stator. The blade can flexibly slide in the groove of the rotor. Under the action of the centrifugal force of the rotor rotating and the pressure oil flowing into the blade root, the blade top is closely attached to the inner surface of the stator, so that two adjacent blades, the oil distribution plate, the stator and the rotor a sealed working chamber is formed between the two. This kind of pump is used to pump oil and pressure once during the rotation of the rotor, so it is called single-acting pump. The rotor is subjected to radial hydraulic imbalance, so it is also called unbalanced pump, and its bearing load is large. By changing the amount of eccentricity between the stator and the rotor, the displacement of the pump can be changed, so the pumps are variable pumps.

2. How the double acting vane pump works

Its principle of action is similar to that of a single-acting vane pump. The only difference is that the stator surface is composed of two long-radius arcs, two short-radius arcs and four sections of transition curves, and the stator and rotor are concentric. . In the case where the rotor of the illustrated rotor rotates clockwise, the volume of the sealed working chamber gradually increases at the upper left and lower right corners, which is the oil absorption zone, which gradually decreases in the lower left corner and the upper right corner, and is the oil pressure zone; the oil absorption zone There is a section of oil seal between the oil and pressure zones to separate them. The rotor of this kind of pump rotates once every revolution, and each sealed working chamber completes the oil absorption and oil pressure action twice, so it is called double-acting vane pump. The two oil suction zones and the two oil pressure zones of the pump are radially symmetrical, and the hydraulic pressure acting on the rotor is radially balanced, so it is also called a balanced vane pump.