(1) Internal feedback pressure limiting variable vickers vane pump
The force Fx distribution plate line is deflected linearly by a θ Angle relative to the stator center line. The force F of oil p on the stator generates a component force Fx in the direction of the stator center line. When Fx is less than the compensator spring preload force:
1) The eccentricity of stator and rotor is maintained at maximum value
2) The Q of the pump decreases slightly with the increase of discharge p, as shown in section AB of the characteristic curve when the discharge pressure is greater than PB, the increase of Fx makes the stator move towards the decrease of e, and the Q of the pump decreases rapidly with the increase of discharge pressure. When raised to Pc, e decreases, Qt= leakage, then Q=0, there is Pmax. Adjust screws 6 and 3, increase the spring preload, increase PB, Pc, and shift the characteristic curve BC to the right. The smaller the spring stiffness, the steeper the BC section, and the closer Pc and PB are. Screw 3 changes the pump's maximum e, while changing Qmax shifts the AB segment up and down. Internal feedback limited pressure variable pump can only be one-way variable.
(2) The working principle of vickers vane pump single-acting stator cavity line is round, rotor shaft and stator eccentric.
When turning counterclockwise, the right half of the working V increases and the left half V decreases. Suction and discharge oil from the suction and discharge ports of the oil distribution pan on both sides. When the two adjacent blades turn to the sealing area between the suction and oil discharge ports, the stator curve contacted is not a concentric arc with the rotor. The center Angle of the sealing zone is slightly larger than that of the adjacent blades. The working V between blades increases slightly first, and then shrinks slightly, which will produce oil trapping phenomenon, but it is not too serious. It can be solved by opening a triangular unloading slot on the edge of the discharge outlet. The stator, rotor and bearing are subject to radial force and belong to the non-unloading vickers vane pump. The working P should not be too high, and the uniformity of Q is worse than that of double action. Moving the stator can change the direction and size of the eccentricity, and can be made into a bidirectional or one-way stepless variable pump with constant n and variable Q. One of the most used is the limited pressure variable vickers vane pump.
(3) The working principle of vickers double-vane pump
1. The stator (inner cavity line) : 1) two long radius arcs 2) two short radius arcs 3) four transition curves
2. Rotor: there are a number of blade slots, there are blades. When rotating, the blade is subjected to centrifugal force and liquid pressure, and the inner wall of the stator is pushed outside, and the reciprocating sliding in the groove.
3. Oil distribution disc: On both sides of the stator and rotor, there are two pairs of suction and discharge ports on the disc, forming a number of working Spaces between the stator, rotor, blade and oil distribution disc. When the blade changes from short to long radius, V between the blades increases and P decreases, and oil is absorbed through the oil distribution pan. When the blade is from long to short radius, the V between the blades decreases, and the oil is discharged through the outlet of the oil distribution pan. When the blade is located in the sealed area, just separate the suction and discharge ports, and the V between the blades is unchanged, there is no trapped oil problem. The rotor turns one week, and each working V is sucked and drained twice (double acting pump).
