A rebound jet type deflector plate electro-hydraulic servo valve with static pressure support

Abstract

The invention relates to an electro-hydraulic servo valve having a hydrostatic bearing function and provided with a rebound jet deflector. The electro-hydraulic servo valve comprises a jet device, a power stage, a drive device and a feedback device, wherein the jet device is arranged in a valve body, is jointed with the drive device and comprises a jet tray, an oil return chamber formed in the jettray and a deflector which is arranged in the oil return chamber and provided with an omega-shaped groove, and the oil return chamber is connected with an oil source through a hydrostatic bearing unit; the power stage comprises a slide valve arranged in a valve sleeve and is used for controlling fluid flowing direction and adjusting pressure and flow; the drive device comprises a torque motor arranged on the valve body and an armature assembly, and is used for driving the deflector to deflect to drive a slide valve core; the feedback device comprises a feedback rod, one end of the feedback rod is connected with the slide valve core, and the other end is connected with the deflector. Compared with the conventional deflector servo valve technology, the electro-hydraulic servo valve is provided with a damping hole and a hydrostatic chamber, the deflector is stressed in a balanced manner in the axial direction of the jet channel by means of hydrostatic bearing, and the electro-hydraulic servo valve has the advantages of high stability, high reliability, long service life and the like.

Description

technical field [0001] The invention relates to the technical field of fluid control, in particular to a rebound jet type deflector plate electro-hydraulic servo valve with static pressure support. Background technique [0002] The deflector jet stream servo valve appeared in the 1970s. In 1967, the Moog Company of the United States researched and developed the deflector jet servo valve (see patent literature: Mcfadden, Edward F, Williams, Leonard J. Free jet stream deflector valve: US 3542051 [P] , 1970-11-24). Compared with the jet pipe servo valve, the main advantage of the deflector plate servo valve is that it does not need a coiled oil supply pipe, which eliminates the possible vibration in the structure, and has a simple structure and reliable operation. The key components of the deflector jet servo valve are the deflector plate and the jet disc, whose structure has a direct impact on the dynamic and static characteristics of the servo valve. Therefore, there have be...

AI Technical Summary

Problems solved by technology

In 2004, Muchlis Achmad improved the structure of the jet tube servo valve, canceled the coiled oil supply pipe of the jet tube servo valve, arranged the jet port and the receiving port on the same side, and controlled it through the movement of the deflector plate with grooves cut above it. The flow entering the receiving port, this structure actually belongs to the jet servo valve with deflector plate, but the mass of the heavy hammer deflector plate reduces the response speed of the servo valve (see patent literature: MuchlisAchmad.Methods and apparatus for splitting and directing a pressurized fluidjet within a servovalve: US 20060216167 A1, 2006-9-28)

[0005] At present, most of the deflector plate jet servo valves developed and used adopt a deflector plate structure with a V-shaped window. For this structure, when the oil supply pressure fluctuates, the gap between the deflector plate and the nozzle will be out of control Changes, which will lead to changes in a series of parameters related to the gap such as pressure, flow recovery coefficient, etc., which will cause instability in the output flow and pressure of the servo valve pre-stage

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