A damping half-bridge pilot control on-off valve

Abstract

The invention belongs to the field of fluid transmission and control, and specifically relates to a damping half-bridge pilot control switching valve, which includes a valve body and a main valve core, and driving devices are respectively provided at both ends of the valve body, and the driving device is connected to the main valve core. A regulating chamber is formed between them, and the regulating chamber is provided with a pilot spool, and the valve body is provided with a first bridge for connecting the regulating chamber and the low-pressure oil outlet, and a second bridge for connecting the regulating chamber and the high-pressure oil inlet, There is a fixed damper in the first bridge or the second bridge. By driving the pilot spool, the adjustment chamber is connected or disconnected from the high-pressure oil inlet or the low-pressure oil outlet, forming a hydraulic force to move the main spool. The invention can greatly increase the driving force, reduce the volume of the electromagnetic driving device, reduce the input energy required for driving, and save energy and reduce emission.

Description

technical field [0001] The invention belongs to the field of fluid transmission and control, and in particular relates to a damping half-bridge pilot control on-off valve. Background technique [0002] Fluid control valves, especially hydraulic valves, play the role of controlling flow, pressure and switching oil circuits. For example, the electromagnetic switching valve plays the role of controlling the flow and switching the oil circuit; the electromagnetic switching valve is divided into: single-stage valve (direct acting valve) and two-stage valve (pilot control valve) according to the flow capacity. In the industry standard, single-stage valves (direct-acting valves) are divided into 6 channels and 10 channels; two-stage valves (pilot control valves) are divided into 16, 25, 32... channels (the larger the number The larger the valve volume, the greater the flow capacity). [0003] The fluid switching control valve used for small flow is generally in the form of a sing...

AI Technical Summary

Problems solved by technology

For fluid control valves with medium and large flow rates, since the hydraulic force acting on the valve core is too large when the valve core is opened, it is still impossible to overcome the hydraulic force to push the valve core simply by increasing the volume of the electromagnetic drive device.

So the current technology is: use a small electromagnetic switch valve (usually 6-way through) as the pilot stage, control the pressure of the left and right chambers of the valve core, and realize the hydraulic power to push the valve core, which solves the problem of large flow down-changing However, this technology not only increases the volume of the switch valve, but also increases the cost. The superposition of the two valves also increases the complexity of the valve and reduces the reliability of the valve.

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