Damping half-bridge type pilot control switch valve

Abstract

The invention belongs to the field of fluid transmission and control, and particularly relates to a damping half-bridge type pilot control switch valve. The damping half-bridge type pilot control switch valve comprises a valve body and a main valve core, driving devices are arranged at the two ends of the valve body correspondingly, an adjusting cavity is formed between the driving devices and themain valve core and provided with a pilot valve core, the valve body is provided with a first through bridge used for communicating with the adjusting cavity and a low-pressure oil outlet, and a second through bridge used for communicating with the adjusting cavity and a high-pressure oil inlet, fixed damping is arranged in the first through bridge or the second through bridge, the pilot valve core is driven to enable the adjusting cavity to be connected with or disconnected from the high-pressure oil inlet or the low-pressure oil outlet, hydraulic acting force is formed, and thus the main valve core is moved. According to the damping half-bridge type pilot control switch valve, driving force can be greatly increased, the size of an electromagnetic driving device is decreased, input energy required for drive is reduced, and energy saving and emission reduction are achieved.

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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