异形反馈槽对比例节流阀特性的影响

Influences of Irregular-shaped Feedback Slots on Proportional Throttle Valve Characteristics

研究了不同反馈槽形状下Valvistor型比例节流阀的流量特性,为实现执行器多级流量控制提供参考。建立了比例节流阀数学模型和多学科联合仿真模型,并通过试验验证了模型的准确性。在此基础上,分析了不同反馈槽形状和参数对阀动静态特性的影响。结果表明:反馈槽形状不同,比例节流阀流量特性不同;当反馈槽形状为倒梯形时,阀初始流量增益小,有利于执行器平稳启动;当反馈槽形状为双矩形组合时,阀具有良好的微动控制特性;同时,比例节流阀响应速度随反馈槽面积增益的增大而变快,但较大面积增益和较小预开口量会降低阀的稳定性。

The flow characteristics of Valvistor proportional throttle valves under different feedback slot shapes were studied to provide reference for realizing multi-stage flow control of actuators.The mathematical models and multi-discipline co-simulation models of the proportional throttle valves were established,and the accuracy of the models was verified by the test data.Then,the influences of different feedback slot shapes and parameters on the dynamic and static characteristics of the valves were analyzed.The results show that the proportional throttle valves have different flow characteristics under different feedback slot shapes.When the shape of the feedback slot is inverted trapezoidal,the initial flow gain of the valves is low,which is good for the smooth starting of the actuators.When the shape of the feedback slot is a dual-rectangle combination,the valves possess good micro-motion control performance.Meanwhile,the valve response speed will be increased along with the increase of the area gain in the feedback slots.However,the larger area gain and smaller pre-opening of the feedback slots may reduce valve stability.