Hydraulic sliding valve mechanism containing force balance flow path

Abstract

The invention discloses a hydraulic slide valve mechanism provided with a force-balance channel. The mechanism is characterized in that: a pressure-balance channel I is arranged on a slide valve core and leads pressure oil close to the I surface of a throttle side in an inlet square-cavity to the left end surface of the slide valve by a keyhole I; the valve core is provided with a pressure-balance channel II that leads pressure oil close to the II surface of the throttle side in the inlet square-cavity to the right end surface of the slide valve by a keyhole II. By the balance of the internal hydraulic pressure of the valve core, the hydraulic force compensation mechanism provided with the pressure-balance channel reduces the effect of hydraulic thrust and the requirements of the slide valve on external control power, improves the power range which can be controlled by a directly driving hydraulic slide valve and mainly aims at laying a foundation for the realization of direct control over a hydraulic valve with large latus rectum and large flow and being capable of directly controlling the hydraulic valve of large power, thereby broadening the application range of the hydraulic slide valve mechanism.

Description

technical field [0001] The invention relates to a hydraulic sliding valve mechanism with a balanced flow channel in the field of hydraulic technology, in particular to a hydraulic sliding valve mechanism with a force balanced flow channel for controlling the magnitude and direction of flow entering a hydraulic actuator. Background technique [0002] Hydraulic slide valve is one of the most important control components in hydraulic control technology. It has two-position, three-position, two-way, three-way, four-way and other forms in structure. Its function is to control the flow direction of fluid. and the amount of traffic passing through. However, when the liquid flow passes through the valve port of the slide valve, the momentum of the liquid will change, causing the pressure distribution on the step of the valve core to change, thereby generating an additional force—the hydraulic force acts on the valve core, Existing research results have confirmed that the magnitude ...

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Problems solved by technology

In order to solve this problem, in the application of large flow, the working principle of pilot control is adopted, that is, a small-diameter valve is used to amplify the hydraulic power before controlling the large-diameter hydraulic valve. The disadvantage of this valve is that the structure Complicated, the main problem is poor controllability, the moving process of the spool is affected and limited by the load and system pressure, and the hydraulic force also affects the reliability of the valve work

[0003] For decades, in order to improve the control ability of the slide valve, reduce energy consumption, and reduce the influence of hydraulic power, researchers have carried out a lot of research work and proposed many methods and measures to reduce this additional force, but The proposed methods can basically be attributed to changing the flow angle of the fluid flowing through the slide valve, so that the momentum changes cancel each other out. In order to achieve this goal, the structure of the valve becomes complicated, and some structural improvements also reduce the The flow capacity of the valve also brings many difficulties to the processing and manufacturing, but the effect is not ideal

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