Created on：2021-11-30 15:55

# Structural characteristics and application of double acting vane pump

Structural characteristics and application of double acting vane pump

1. Several important structures and parameters of double acting vane pump

(1) Oil distribution pan.

1) Oil sealing area. Figure B shows the Yb type oil distribution plate structure. In order to achieve the purpose of sealing and flow distribution, there are two oil suction windows 2 and 4 and two oil pressure windows 1 and 3 on the plate. There is an oil sealing area between the two groups of windows. Generally, the center angle B corresponding to the oil sealing area should be slightly greater than or equal to the clamping angle between the two blades, otherwise the oil suction chamber and oil pressure chamber will be connected, resulting in internal leakage of the two chambers.

2) Unloading slot. During the transition of the sealing oil between the two blades from the oil absorption area to the oil sealing area (at the long radius arc), the oil pressure is basically the same as the oil absorption pressure, but when the rotor continues to rotate for a small angle, the sealing chamber will suddenly connect with the oil pressure chamber, resulting in a sudden increase in the pressure of the oil chamber, resulting in a great pressure impact, and the volume of the oil will suddenly shrink, It leads to the backflow of oil in the pressure oil chamber, causing the flow pulsation, pressure pulsation and noise of the hydraulic pump. In order to reduce the pressure impact at this time, a unloading groove (also known as eyebrow groove) with a triangular cross-section shape is respectively opened on the side of the two oil pressure windows 1 and 3 of the oil distribution plate entering the oil pressure area by the blade oil sealing area, as shown in Figure B, so that the closed oil between the two blades is connected with the pressure oil through the triangular groove before entering the oil pressure area, and its pressure increases gradually, Thus, the pulsation of flow and pressure is alleviated and the noise is reduced.

3) Annular groove. As shown in Figure B, in order to ensure that the blade can be thrown out along the radial groove in time and close to the inner cavity surface of the stator during high-speed rotation, an annular groove is set in the middle of the port plate, which is connected with the oil pressure cavity and the bottom of the rotor blade groove, which can make the bottom of the blade act with pressure oil and help the blade move outward quickly under the action of pressure oil.

(2) Stator curve. The stator cavity curve is composed of 4 segments of arc and 4 segments of transition curve. During high-speed movement, ensure that the blade is always close to the transition curve of the inner surface of the stator to form an isolated sealing space. In order to make the acceleration of the blade moving radially in the rotor slot change evenly and the impact of the blade on the stator surface as small as possible, the current stator curves mostly adopt the moving law curve and high-order curve of "equal acceleration and equal deceleration".