What is a Vane Pump?

The vane pump is a pump in which the vanes in the rotor groove are in contact with the pump casing (stator ring), and the sucked liquid is pressed from the oil inlet side to the oil discharge side.

When the vane pump rotor rotates, the tip of the vane is closely attached to the centrifugal force and pressure oil.

In addition to the management of vane pumps, it is necessary to prevent the dry running and overload, prevent the suction of air and the suction vacuum from being too large:

1. If the pump direction is changed, the suction and discharge direction is also changed. The vane pump has a specified direction, and no reverse is allowed. Because the rotor blades are inclined, the blades are chamfered, and the bottom of the blades communicate with the oil discharge chamber. The throttle grooves and the suction and discharge ports on the oil distribution plate are designed according to the intended steering. Reversible vane pumps must be specifically designed. 2. The vane pump is equipped with the oil distribution plate and the positioning pin for the stator. The vane, rotor, and oil distribution plate must not be installed reversely. The suction area of the inner surface of the stator is the most prone to wear. Continue to use for drainage. 3 Pay attention to the clean working surface during disassembly, and the oil should be well filtered during work. 4. If the gap between the blade in the groove is too large, the leakage will increase. If it is too small, the blade will not be able to expand and contract freely, which will cause abnormal working. 5. The axial clearance of the vane pump has a great influence on v. 1) Small pump-0.015 0.03mm2) Medium pump-0.02 0.045mm6. Oil temperature and

(1) Insufficient flow. See Table 1-6 for the causes and elimination methods of insufficient vane pump flow.

Table 1-6 Causes of insufficient flow of vane pumps and their elimination methods

Common faults and their causes	elimination method
Loose screws at the top cover, increase axial clearance, decrease volumetric efficiency	Tighten the screws properly to ensure uniform and proper clearance (clearance 0.04 0.07 mm)
Individual blades slide inflexibly	Cleaning. When it is still not flexible after cleaning, it should be deployed in a single slot to make the blades
The inner surface of the stator is worn, and the blades cannot make good contact with the inner surface of the stator	The inner surface of the stator is generally worn at the suction cavity
Worn end face of flow plate	replace
Blade and rotor are mounted in reverse	Make the direction of blade inclination the same as the direction of rotation of the rotor
Large system leakage	Check for leaks on a component-by-component basis while checking for pressure gauges that are blocked by dirt

(2) The oil cannot be sucked. See Table 1-7 for the reasons and troubleshooting of the vane pump oil failure.

Table 1-7 Reasons and troubleshooting methods for oil suction of vane pump

Common faults and their causes	elimination method
The oil level is too low for the oil to suck	Check and fill to the specified oil level
The oil viscosity is too large, making the blades not slide in the rotor groove. flexible	Generally use 20 # hydraulic oil or 22 # steam turbine oil
Poor contact between the end of the oil distribution plate and the inner plane of the housing	Refitting the end of the oil pan
There are trachoma inside the pump body.	replace
The motor turned in the reverse direction	correct

(3) The noise of the pump is too large. See Table 1-8 for the causes and excessive elimination of pump noise.

Table 1-8 Causes of Excessive Noise of Pumps and Their Elimination Methods

Common faults and their causes	elimination method
Oil filter is clogged and sucks oil poorly	Wash
Leak at the suction side	Use buttering method to check the suction pipe joints one by one. If the noise is reduced, tighten the joints. Or directly observe whether air bubbles appear at the oil return port.
Worn pump end seal	Apply grease to the shaft end oil seal. If the noise is reduced, replace the oil seal.
Pump cover screw loosened due to vibration	Butter the screw joints and tighten the screws if the noise is low
Pump and motor shaft are not concentric	Refocus
Both sides of the rotor blade slot are not perpendicular to its two ends	Replace the rotor
Triangle groove for oil pan unloading is too short	Appropriate modification with assorted files, so that when the former blade passes the unloading groove, the latter blade has left the suction cavity
Spline groove shaft end seal is too tight (hot hands)	Proper adjustment and replacement
Pump speed is too high	Use at the specified speed
Insufficient oil absorption of the oil pump	Check oil height
Severely contaminated hydraulic oil	Remove the oil filter, check whether the oil filter is damaged, if there is more solid adsorption, replace the oil filter and hydraulic oil
Pressure swing	Check the wear of the pump core master pressure valve spool