大减压比高压气动比例减压阀阻尼孔耦合特性仿真研究

Simulation of the Coupling Characteristics of Damping Hole in High-pressure Pneumatic Proportional Reducing Valve with Large Reducing Ratio

设计了一种大减压比高压气动比例减压阀,采用先导控制方式,通过调节比例电磁铁推力控制减压阀输出压力。通过进气阀芯与先导阀芯联动,调节进入控制腔气量,从而控制主阀芯开度,调整主阀芯节流作用,最终控制减压阀输出压力,达到输出压力与电磁铁推力动态平衡。控制腔的压力受控制腔进气阻尼孔大小、排气阻尼孔大小及进气阀开度影响。为此,建立了该比例减压阀的动力学及热力学数学模型,根据动力学及热力学数学模型搭建比例减压阀系统仿真模型,通过数值仿真分析主阀芯控制腔进气、排气阻尼孔参数与进气阀芯开度间耦合特性对该比例减压阀输出压力的影响,进一步优化该比例减压阀结构,提高减压阀输出压力控制精度及响应速度。本研究对同类型高压气动减压阀优化设计及输出压力控制性能的提高提供一定参考。

This paper introduces a pilot-operated high-pressure pneumatic proportional pressure reducing valve,reducing for a large scale,whose outlet pressure can be directly controlled via adjusting the output force of the proportional solenoid.The output pressure,which will be equal to the force of the solenoid,is directly determined by the pressure of the controlling chamber that is adjusted by the bless-in spool,influencing the flowrate that flow into the controlling chamber.The pressure of the controlling chamber is influenced by the diameter of the inlet damping hole,the outlet damping hole and the opening area of the bless-in spool.Therefore,the dynamic and thermodynamics mathematical model of the valve is established,and the simulation model,which is the tool to analysis the coupling characteristics of the parameters of the three damping hole,is established according to the mathematical model.This paper can provide some reference for the optimization of the structure and control performance during the design of the same type of high pressure pneumatic valves.