High flow rate oil supply and oil return fast switching electrohydraulic servo valve

Abstract

An electrohydraulic servo valve capable of realizing quick switching between high-flow oil supply and oil return comprises a working valve body provided with a working oil port and an oil inlet port, a throttle block provided with an axial through hole and an oil return valve body provided with an oil return port, wherein the throttle block, the working valve body and the oil return valve body are connected in turn and axially form an oil return passage which is communicated with the working oil port, the oil inlet port, the through hole and the oil return port; the on and off of an entire oil passage are controlled through an electromagnetic valve which is arranged on the other side of the throttle block and is used for controlling the on and off of the through hole and a ball valve arranged inside the oil return passage; the ball valves comprise an oil return ball valve arranged inside the oil return passage of the oil return valve body and an oil feed ball valve arranged inside the oil return passage of the working valve body; and the electromagnetic valve controls the on and off of the through hole through a switching ball valve arranged on a port of the throttle block. The electrohydraulic servo valve can quickly lift the ball valves to switch on a control loop, and the control loop can control a plunger to further control the on and off of a bigger valve. Moreover, the electrohydraulic servo valve can work under high pressure, and the ball valves connected with the electromagnetic valve are affected little by pressure.

Description

technical field [0001] The invention relates to a high-pressure oil supply system. In particular, it relates to an electro-hydraulic servo valve capable of realizing high-speed and large-flow control of a high-pressure diesel engine high-pressure fuel injection pressure generating system, and fast switching between large-flow oil supply and oil return. Background technique [0002] As we all know, the electronically controlled high-pressure common rail technology is one of the advanced technologies of the current engine. Because the common rail pressure has nothing to do with the engine speed, the common rail pressure value and the fuel injection timing of the injector, the fuel injection quantity can be flexibly adjusted, and the high fuel injection Pressure and other advantages have attracted close attention from the diesel engine industry. Internationally, high-pressure common rail technology is developing towards ultra-high pressure with an injection pressure greater th...

AI Technical Summary

Problems solved by technology

Ordinary ball valves can meet the requirements of quick response, but due to the high oil pressure of the system, a large opening electromagnetic force is required, which is difficult to achieve; ordinary slide valves are less affected by the working oil pressure, but the switch response is difficult to meet the requirements

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