A low-leakage high-response high-flow high-speed switching valve

Abstract

The invention discloses a switch valve with the low leakage, high frequency response, large flow and high speed. The switch valve is composed of a linear motor, valve elements, valve bushes, a floating compensation block, a sealing ring, a displacement sensor and a controller. The valve elements rotate rapidly under the jet flow action, the two valve elements are nearly symmetrically arranged, axial liquid power balance is guaranteed, and the response speed of the valve is increased. N triangular valve ports are evenly formed in the valve element at each end, wherein N is equal to or larger than one and is equal to or smaller than six, a PWM flow signal is generated under self-rotation of the corresponding valve element, and therefore the flow capacity of the switch valve is 2N times that of a common high-speed switch valve. The PWM control frequency exceeds 100 Hz and the duty ratio range is widened and reaches 0-90%. The sealing function is achieved by the floating compensation block, automatic compensation can be achieved, and inner leakage of the valve is remarkably reduced. The linear motor drives the valve elements to move linearly, position control is achieved through the displacement sensor, and therefore the duty ratio is accurately controlled. Under rotation of an oil wedge and the valve elements, oil film lubrication of the supporting and sealing portions of the valve elements is guaranteed, movement resistance of the valve elements is remarkably reduced, and the response speed and accuracy of the valve are improved.

Description

technical field [0001] The invention relates to a low-leakage, high-response, large-flow, and high-speed on-off valve, which belongs to the field of digital electro-hydraulic control. Background technique [0002] With the development of computer technology and the increasingly widespread application, electro-hydraulic digital control technology has become an important means to realize mechatronics, and it is an ideal method to realize high-speed and high-precision control of hydraulic systems. It has been widely used in aerospace, Automobiles, metallurgy, agricultural machinery, construction machinery and other important fields. The research on high-speed switching valve is an important part of the electro-hydraulic digital control technology, and it is the key component to realize the electro-hydraulic digital control. The high-speed switching valve adopts the hydraulic digital control of pulse width modulation (PWM), which has the advantages of reliable operation, conveni...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a low-leakage, high-response, large-flow, high-speed on-off valve, which can maintain high-flow, high-response and low-leakage characteristics under different pressures, and solve the problems of low efficiency and small flow capacity of high-speed on-off valves

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