orking principle of vane pump

创建于05.17

g. Besides considering the strength of stator, rotor, blade and other components, and the wear between the blade and the inner surface of the stator caused by the compression thrust of the blade acting on the inner surface of the stator, another problem that must be solved to realize the high pressure of the double acting vane pump is the leakage of the end surface of the rotor and blade, so as to maintain high volumetric efficiency. The measure to solve this problem is to use floating valve plate. As shown in Figure m, the "back" of floating valve plate 2 is connected with high pressure oil, and its pressure is slightly greater than the "front" oil pressure thrust (generally 15% - 30%) contacting with the rotor. During operation, the valve plate will automatically stick to the stator end face, and produce appropriate elastic deformation, so as to maintain a small gap between the rotor and the valve plate, So as to reduce the leakage between the rotor, blade end face and the valve plate, so that the vane pump can maintain high volumetric efficiency under high pressure. YBa vane pump is such a structure.

h. Series and parallel connection of double acting vane pump connect two single-stage double acting vane pumps in series. A set ratio reducing valve is installed between the two pumps to form a two-stage pump. The pressure difference between the inlet and outlet of the two pumps is equal, and the rated pressure of the two pumps is twice that of the single pump. At present, the working pressure of single-stage pump is very high, reaching 21 ~ 32Mpa, so the two-stage pump has been gradually eliminated.

When two or more single-stage double acting vane pumps are connected in parallel, that is to say, a double pump or a multi pump is formed. At this time, the flow of the pump can be combined according to the load demand, and the power utilization is more reasonable.

(3) As shown in Figure n, the relationship between the stator and rotor of the cam rotor vane pump is opposite to that of the single acting pump and double acting pump mentioned above. The vane slide of the pump is not on the inner surface of the stator (shell 3) (composed of four arcs and four transition curves), but on the outer surface of the rotor (CAM) 2. The rotor 2 is driven to rotate by the transmission shaft 4, and the blade 1 is installed in the groove of the housing 3, which is pressed to the cam by the oil pressure and the spring 5, and reliably contacts with the cam surface, separating the oil suction area a and the oil pressure area B on both sides. The long diameter (radius R) of the cam is matched with the shell to form a sealing clearance, which also has the function of auxiliary support.

The transmission shaft drives the cam to suck and press oil twice every revolution, so it is a double acting pump. In addition, the radial and axial forces on the rotor and stator of the cam rotor vane pump are balanced, the bearing load is small, the cam size is small, and the linear speed between the blade and the slideway is low. Therefore, the cam rotor vane pump can operate under higher pressure and speed, and has a long service life, which is suitable for medium and high pressure. But can not stepless variable, that is, can only be made into quantitative pump.

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