Conical sealing type hydraulic large-flow high-speed digital valve

Abstract

The invention relates to the technical field of solenoid valves, in particular to a hydraulic high-flow high-speed digital valve with a solenoid valve arranged in the middle. The hydraulic high-flow high-speed digital valve comprises a valve body and a valve element arranged in the valve body in a sliding manner; the back end of the valve element is provided with a cylindrical moving armature in a sleeving manner; a fixed armature is arranged in the valve body behind the moving armature; the valve body comprises a front valve body, a back valve body and a spacer bush arranged between the front valve body and the back valve body; the front and back valve bodies are made of magnetic materials; the spacer bush is made of a non-magnetic material; the joint faces of the fixed armature and the moving armature are positioned in a coverage area of the spacer bush; an annular coil block is arranged outside the valve body in a sleeving manner. A solenoid coil is positioned in the middle section of the valve body, and the integral structure is more compact; the position of the fixed armature can be conveniently adjusted, so that a gap between the fixed armature and the moving armature is finely adjusted; taper faces with unequal inclination angles at the joint of the valve element and the valve body ensure the stress balance of the valve element, the sealing effect is improved, and leakage caused by nonuniform abrasion of a sealing face can be avoided.

Description

technical field [0001] The invention relates to the technical field of solenoid valves, in particular to a cone-surface sealed hydraulic large-flow high-speed digital valve. Background technique [0002] With the continuous improvement of the automation level in the hydraulic field, the demand for high-speed digital valves is increasingly urgent. Hydraulic unbalance forces increase with spool size and can severely affect spool movement. Therefore, the spool diameter of the current high-speed digital valve cannot be too large, that is, the flow rate is very small. The working pressure of a typical product is 20MPa, the flow rate is only 2-9 liters / min, and the frequency response is 5ms. Obviously, there is a long way to go before the flow rate of engineering hydraulic system reaches hundreds of liters per minute, or even higher. Chinese patent 2013101571439 discloses a "hydraulic large flow high-speed digital valve", which includes a valve body and a valve core slidingly i...

AI Technical Summary

Problems solved by technology

The digital valve has the following points to be improved: 1) The electromagnet and electromagnetic coil are located at the end of the valve body, and the electromagnetic efficiency is low; 2) The sealing between the valve body and the valve core adopts surface contact, which is difficult to process. Uniform wear is prone to the problem of loose closing; moreover, the sealing surface in surface contact causes the area of ​​the hydraulic oil in the oil outlet to act on the closing direction of the valve core in the closed state of the valve to be larger than the area in the opening direction. The resultant force of the oil on the spool in the direction of movement is not zero, which will generate a force to close the spool, restrict the movement of the spool, and even prevent it from opening. Therefore, this structure can only be used in hydraulic control with low outlet pressure. limited use

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