Hydrodynamic compensation balance valve

Abstract

The invention discloses a hydrodynamic compensation balance valve. A pilot control end cover assembly comprises a control end cover valve body, and a pilot oil channel is arranged on the control end cover valve body; a valve element assembly comprises a throttling valve element, a main spring and an adjusting valve seat; a one-way valve seat assembly comprises a one-way valve and a one-way valve spring; a balance valve body assembly comprises a balance valve body and a valve seat; the throttling valve element is provided with a throttling opening with the angle of alpha; the right end inner wall conical surface of the one-way valve is mutually matched with a throttling opening conical surface of the throttling valve element to form opening and closing sealing; and the one-way valve moves to the left when the amplitude of variation rises, the one-way valve function of the balance valve to an oil opening B from an oil opening A is realized, the throttling valve element is started to theright under the action of pilot control pressure when the amplitude of variation declines, the balance valve function from the oil opening B to the oil opening A is realized, with the increasing of loading pressure, the opening size of the throttling opening of the throttling valve element is controlled by hydrodynamics generated by an annular overcurrent channel with the angle of the throttling valve element of alpha, and load-flow compensation is realized.

Description

technical field [0001] The invention belongs to the technical field of engineering machinery and relates to a hydraulic power compensation balance valve. Background technique [0002] When the hydraulic system of construction machinery is working, if the load of the hydraulic cylinder is a vertical and horizontal load, and the direction of movement and gravity are consistent with the direction of the force, a balance valve must be used to generate oil flow resistance on the circuit to prevent the movement from losing control. Especially in the luffing system of the crane, the requirements for the balance valve are higher. The load moment arm increases due to the change of the luffing drop angle, and at the same time, the increase of the load pressure causes the luffing drop speed to become faster and faster, which is likely to cause safety accidents. Therefore, It is necessary to design a compensation function for the luffing balance valve that can effectively suppress the s...

AI Technical Summary

Problems solved by technology

[0004] The prior art has the following defects: (1) The existing balance valve with overcompensation function used in the hydraulic system of construction machinery is equipped with an overcompensation damping structure through the pilot valve core, which has complex structure, large volume and high cost;

[0005] (2) After the overcompensation function is added to the balance valve used in the hydraulic system of construction machinery, the balance valve has many sealing points, increases leakage points, and is difficult to process

Images