ZF Hydraulic & Pneumatic parts Co., Ltd

ZF Hydraulic & Pneumatic parts Co., Ltd

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The working principle of vane pump

Author : Zhang Date : 1/13/2013 6:59:44 PM
The working principle of vane pump

Vane pump was composited by the stator, rotor, oil distribution plate , below are the working principle of vane pump for details.

A. internal feedback pressure limiting type variable vane pump
Force Fx oil distribution plate line relative to the stator center line to the deflection Angle θ. Discharge p to stator force F was stator center line direction produce component Fx. When Fx less than compensator spring pre-tightening force:
1) stator and rotor eccentricity keep maximum
2) pump Q with discharge p increased slightly lower, such as the characteristic curve of AB section shows when the exhaust pressure is greater than the PB, Fx increase make stator to reduce e movement, pump Q is increased with the exhaust pressure reduced quickly. When up to Pc, e decreases, and Qt = leakage quantity, the Q = 0, Pmax. Screw 6 and 3, increases the spring pre-tightening force, PB, Pc increases, the characteristic curve BC period of right. The smaller the spring stiffness, the BC period of the steep, Pc and PB, the closer. Screw 3 variable pump the biggest e, and change the Qmax, AB section is up and down the translation. Internal feedback limited pressure variable pump can only one-way variable.

B. the single-acting vane pump working principle stator inner chamber type line is round, rotor shaft and stator eccentric. Counterclockwise rotation, work V right turn add, left turn V decrease. From both sides of the plate with oil suction, discharge  suck and discharge. Two adjacent blade turned to the suction and discharge of oil between the mouth sealing area, contact with stator curve is not and rotor concentric circular arc. Seal the central Angle is slightly higher than that of adjacent blades of central Angle. Between leaf work V first increases slightly, and then a little narrow, will produce the trapped oil phenomenon, but not too serious. Through the outlet edge open triangle unloading slot method can solve. Stator and rotor and bearing by the radial force, belong to the unloading type vane pump. Work is not too high P, Q uniformity than double action difference. Mobile stator can change the direction of the eccentric and size, but make it n constant and Q variable bilateral or unilateral of stepless variable pump. Which is more limited pressure variable vane pump.

C. double vane pump working principle
1). The stator (lumen lines) : 1) two long radius arc 2) two short radius arc 3) four period of transition curve
2). Rotor: there are a number of leaf tank, with blade. Rotating, blade by centrifugal force and fluid pressure, under the action of the top wall, and the stator slot in reciprocating sliding.
3). Oil distribution plate: in the stator and rotor plate on both sides, there are two to suck, discharge, in the stator and rotor, leaf and oil distribution plate are formed between the working space. Blade from short to long radius, vane V increases, P is reduced, the oil distribution plate of oil absorption. Blade from long to short radius, vane V decreases, and the oil distribution dish outlet discharge. When the blade is located in the seal area, it will let suck and discharge separated, the blade between V unchanged, no trapped oil problem. Rotor turn a week, each work all V of the suction and discharge two (double-acting pump).

The above: The selection of oil filter method and its installation operation