Novel valve plate for balancing overturning moment

Abstract

The invention discloses a novel valve plate for balancing the overturning moment. On the one hand, high-pressure oil in a left kidney-shaped groove enters into a pressure balance oil chamber on the right side through a damping connecting groove, and in the same way, low-pressure oil on the right side also flows into a pressure balance oil chamber on the left side, and the high-pressure oil and thelow-pressure oil are correspondingly distributed on the two sides of the valve plate, so that the force conditions on the left side and the right side of the valve plate can be balanced; and on the other hand, the size of an oil suction window is smaller than the size of an oil discharge window by designing waist-shaped groove windows with different sizes on the valve plate, so that the pressureof oil in an oil discharge area can be lowered, and the imbalance force distribution on the valve plate is further improved. By the adoption of the novel valve plate, the structure size of the valve plate can be reasonably utilized, the force on the valve plate is improved to the maximum extent, the overturning moment is balanced, the vibration caused by the pressure impact is reduced, the sealingcan be guaranteed while the noise is reduced, the leakage rate of a pump is reduced, and the mechanical efficiency and volumetric efficiency of the pump work are improved.

Description

technical field [0001] The invention relates to a novel flow distribution plate for balancing the overturning moment, which is mainly used in an axial plunger pump to balance the pressure difference between high and low pressure oil chambers. Background technique [0002] The plunger hydraulic pump is a hydraulic pump that relies on the reciprocating movement of the plunger in the cylinder bore to change the volume in the plunger cylinder to achieve oil suction and oil pressure. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency and convenient flow adjustment. Piston pumps are divided into axial plunger pumps and radial plunger pumps. Radial plunger pumps are plunger pumps in which the reciprocating direction of the plunger is perpendicular to the drive shaft, while axial plunger pumps use The plunger moves back and forth in the plunger hole to produce volume changes to work. Axial piston pumps can also be divided into two types:...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of leakage friction and unbalanced force between the distribution plate and the distribution end face of the cylinder block, which affect the stability and balance of the operation of the cylinder body, the overturning moment generated is likely to cause eccentric wear of the distribution assembly, resulting in the axial plunger The sealing effect of the pump distribution pair is not good, resulting in large leakage, which makes the axial piston pump unable to work normally, and phenomenon such as shaft holding, vibration and noise, etc.

Therefore, the existing design method of the distribution mechanism based on the residual pressing force, even if the pressing force on the cylinder body is properly greater than the separation force generated by the oil film, requires a suitable residual pressing force to form a proper friction between the friction pairs. The boundary lubricating oil film has a certain sealing performance, but its disadvantage is that it can only form an unstable boundary lubricating oil film; and to solve the problem of uneven pressure in the high and low pressure waist window, by designing two rows of plunger pumps on the cylinder , there are double rows of oil suction ports and double rows of oil ports on the distribution plate, so that the high and low pressure waist grooves are staggered with each other to solve the problem of unbalanced force in the high and low pressure chambers, but such a structure requires the design of two sets of sliding shoes Vice, and the structure is complex, there are many parts, it is not easy to realize

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