先导流量放大型比例方向流量阀特性仿真研究

Simulation Research on Characteristics of Proportional Directional with Pilot Flow Amplification

由于缺少高动态的流量测量方法,导致直接测量先导级流量成为一大难点。为此,设计一种具有流量-位移转换功能的动态流量计,并将该流量计应用于位移-流量反馈型比例方向阀先导级,实现对先导阀流量的测量与控制,构成先导流量放大型比例方向流量阀。在SimulationX中搭建先导流量放大型比例方向流量阀仿真模型,研究其动、静态特性。结果表明:该阀具有良好的静态控制精度,能准确控制输出流量;主阀进出口压差越大,阀芯动态响应越快;负载变化会引起流量超调,但调节时间短。

Due to the lack of high dynamic flow measurement methods,it is difficult to directly measure the flow of pilot stage.A dynamic flowmeter with flow-displacement conversion function was designed,and the flowmeter was applied to the pilot stage of the displacement-flow feedback type proportional direction valve to measure and control the flow of the pilot valve,and form a proportional direction flow valve with pilot flow amplification.The simulation model of the proportional directional flow valve with pilot flow amplification was built in SimulationX,and the dynamic and static characteristics of the valve were studied.The results show that the valve has good static control precision and can accurately control the output flow;the larger the pressure difference between the inlet and outlet of the main valve is,the faster the dynamic response of the spool is;the load change will cause the flow overshoot,but the adjustment time is short.