Leakage of
Hydraulic Pump Because most of the relative moving parts in the hydraulic pump are sealed by the clearance seal, the hydraulic pump works When, the high pressure oil of the oil pressure chamber must flow to the oil suction chamber and other low pressure places through this gap, thus forming a drain Leak. This not only reduces the volumetric efficiency of the pump, the flow of the pump is reduced, and limits the rating of the hydraulic pump An increase in stress.
Therefore, controlling leakage and reducing leakage is the basic condition to ensure the normal operation of hydraulic pump
One of them. The leakage condition of hydraulic pump is the existence of gap and pressure difference, and its leakage and gap value three times Is proportional to the first power of the pressure difference. Analysis of pump leakage is mainly from seal clearance size,
Clearance pressure difference and whether the movement increases leakage three aspects.
The main leakage clearance of the plunger pump is the annular clearance between the plunger and the cylinder hole, followed by the axial column The end clearance between the piston pump cylinder block and the valve plate, and the plane clearance between the sliding shoe and the swash plate. For radial column In addition to the annular clearance between the plunger and the cylinder hole, the radial clearance between the cylinder and the valve shaft, Clearance between the shoe and the inner ring of the stator. Because the precision of the ring clearance between the plunger and the cylinder hole is easy to control, And other gaps are easily compensated, so the volume efficiency and pressure rating of the plunger pump are higher. In leaf The main leakage clearance in vane pump is the end clearance between the rotor and the valve plate, followed by the blade and the rotor The clearance between the blade slots, between the top of the blade and the inner ring of the stator. Medium and high pressure double acting vane pump to reduce leakage Leakage, some will be designed as a floating valve plate, to achieve automatic end clearance compensation. External meshing tooth The main clearance of the wheel pump is the end clearance between the gear end face and the front and back pump cover or the left and right side plates, followed by And the radial clearance between the tooth tip and the pump body circle, the meshing clearance between the two meshing gear teeth. Medium-high pressure gear The end clearance of the pump is compensated by an automatic floating compensation mechanism.
