Pressure servo valve feedback mechanism

Abstract

A pressure servo valve feedback mechanism mainly solves the technical problems of non-linear property and the like of a pressure servo valve. The invention adopts the technical scheme that a feedback mechanism is arranged under a torque motor and a fluidic amplifier and above a main valve, the feedback mechanism consists of a control valve set and a feedback rod set, one end of the feedback rod set is connected with the control valve set, the other end of the feedback rod set is connected with the fluidic amplifier which is connected with a pore canal of the control valve set, the control valve set is connected with the pore canal of the main valve, and left and right spring assemblies are arranged at two ends of a slide valve assembly of the control valve set respectively. The pressure servo valve feedback mechanism is applicable to various pressure servo valves.

Description

technical field [0001] The invention relates to a pressure servo valve, in particular to an assembly of a pressure servo valve. Background technique [0002] The existing pressure servo valve includes a torque motor, a pre-stage hydraulic amplifier and a power-stage hydraulic amplifier. If the pre-stage is a jet amplifier, when the control current is input to the torque motor, the jet tube will deflect under the magnetic force of the torque motor , then the overlapping area of ​​the two receiving holes of the receiver changes, thus changing the output pressure of the pressure servo; if the pre-stage is a nozzle baffle amplifier, when the control current is input to the torque motor, the magnetic force of the torque motor will Next, the distance between the baffle plate and the nozzles on both sides changes, and the output pressure of the pressure servo valve also changes in the same way. The above-mentioned pressure servo valves are characterized by simple structure and conv...

AI Technical Summary

Problems solved by technology

[0002] The existing pressure servo valve includes a torque motor, a pre-stage hydraulic amplifier and a power-stage hydraulic amplifier. If the pre-stage is a jet amplifier, when the control current is input to the torque motor, the jet tube will deflect under the magnetic force of the torque motor , then the overlapping area of ​​the two receiving holes of the receiver changes, thus changing the output pressure of the pressure servo; if the pre-stage is a nozzle baffle amplifier, when the control current is input to the torque motor, the magnetic force of the torque motor will Next, the distance between the baffle plate and the nozzles on both sides changes, and the output pressure of the pressure servo valve also changes in the same way. The above-mentioned pressure servo valves are characterized by simple structure and convenient debugging, but they have the following disadvantages

[0003] 1. For the servo valve whose pre-stage is a jet amplifier, the displacement-pressure difference characteristic of the jet amplifier is nonlinear and has a negative impact on the output characteristics;

[0004] 2. Due to the change of working conditions or environmental conditions, the displacement of the pre-stage hydraulic amplifier-when the pressure difference characteristic changes, the self-adjustment ability of the pressure servo valve is poor, and it directly affects the output of the valve;

[0005] 3. Unlike the flow servo valve, the pressure servo valve requires a large output displacement of the nozzle, and the movement of the torque motor is open-loop, so it is difficult to improve the pressure control performance and accuracy of the pressure servo valve;

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