The working principle of Rexroth vane pump PV7 series: Rexroth vane pump PV7 series is a pump in which the blades in the rotor groove are in contact with the pump casing (stator ring) to press the suction liquid from the oil inlet side to the oil discharge side. Because there are two types of vane pumps in history, according to the different types: first) specifically refers to the sliding vane pump in the positive displacement pump. 2) Refers to the three pumps of the power pump (centrifugal pump, mixed-flow pump, axial flow pump) or other special pumps. This type of pump product is generally not called a vane pump. However, as a monograph, vane pumps almost all refer to centrifugal pumps, mixed-flow pumps, axial flow pumps, etc. According to whether its theoretical displacement per revolution is a fixed value or a variable value, it can be divided into vane variable pump and vane fixed pump.
When the vane pump rotor rotates, the tip of the vane is tightly attached to the inner surface of the stator under the action of centrifugal force and pressure oil. In this way, the working volume of the two blades and the inner surface of the rotor and stator is first absorbed from small to large, and then drained from large to small, and when the blades rotate for one week, the oil absorption and oil discharge are completed once.
The working principle is detailed as follows:
First, the working principle of single-acting vane pump
The pump is composed of parts such as rotor 1, stator 2, blade 3, oil distribution pan and end cover. The inner surface of the stator is a cylindrical hole. There is eccentricity between the rotor and stator. The blade can slide flexibly in the groove of the rotor, and under the action of the centrifugal force when the rotor rotates and the pressure oil that enters the root of the blade, the top of the blade is attached to the inner surface of the stator, so that a sealed working cavity is formed between the two adjacent blades, the oil distribution plate, the stator and the rotor. When the rotor rotates in the counterclockwise direction, the blade on the right side of the figure stretches outward, and the volume of the sealing working chamber gradually increases, and a vacuum is generated, and then the oil is sucked in through the upper window of the oil suction port 6 and the oil distribution plate 5. And on the left side of the diagram. The blade is indented inward, and the volume of the sealing chamber is gradually reduced, and the oil in the sealing chamber is pressed out and output to the system through another window of the oil distribution pan and the oil pressure port 1. This kind of pump sucks oil and presses oil once in the process of one rotation of the rotor, so it is called a single-acting pump. The rotor is subjected to radial hydraulic unbalanced forces, so it is also called unbalanced pump, and its bearing load is large. The displacement of the pump can be changed by changing the eccentricity between the stator and the rotor, so this kind of pump is a variable pump.
Second, the working principle of double-acting vane pump
Its working principle is similar to that of a single-acting vane pump, except that the stator surface is composed of eight parts: two long radius arcs, two short radius arcs and four transition curves, and the stator and rotor are concentric. Under the circumstance that the rotor rotates clockwise, the volume of the sealing working chamber gradually increases at the upper left corner and the lower right corner, which is the oil suction area, and gradually decreases at the lower left corner and the upper right corner, which is the oil pressure area; There is an oil sealing zone between the suction zone and the pressurized zone to separate them. The rotor of this pump rotates once and each sealed working chamber completes oil suction and oil pressure twice, so it is called a double-acting vane pump. The two suction zones and the two pressurized zones of the pump are radially symmetrical, and the hydraulic force acting on the rotor is radially balanced, so it is also called a balanced vane pump.
The instantaneous flow rate of a double-acting vane pump is pulsating and the pulsation rate is small when the number of vanes is a multiple of 4. For this reason, the number of blades of a double-acting vane pump is generally 12 or 16.
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