Valvistor电液比例流量阀稳定性及特性分析

插装式比例阀具有低泄漏、通流能力强、结构简单等优点,广泛应用于液压系统中,但插装阀所带来的振动及噪声等问题是制约其使用范围的重要因素。对采用流量放大原理的Valvistor型插装阀稳定性及性能进行研究,建立相应的数学模型得出该阀的稳定性条件,发现主阀稳定性与先导阀开口及面积增益有关;在SmiluationX软件环境中建立该阀的仿真模型,并利用实验对其进行验证。理论分析与仿真结果表明:随着主阀进出口压差、反馈窄槽面积梯度的增大,主阀芯响应速度加快,但会导致主阀芯不稳定区域增加;控制腔体积越小,主阀芯稳定性越好。研究结果为该类型阀性能的提高提供了理论依据。

Stability and Characterization Study of the Valvistor Valve

Poppet type metering valves are widely used in hydraulic systems due to their many advantages, such as low leakage, large flow capacities, and economical design. However, they can also induce unpredictable vibration and noise in hydraulic systems. In this paper, the stability and performance of Valvistor valves that use the flow amplification principle are studied. A stability criterion was derived from a mathematical model and showed that the stability of the valve was related to the opening of the pilot valve. The hydraulic system model of the valve was established using the simulation software SmiluationX. The valve was measured in order to validate the mathematical model and valve model. Theoretical analysis and simulation results showed that increasing the pressure drop and the width of the slot will increase the response speed of the spool but reduce the stability of the valve, and reducing control chamber volume will increase the stability of the valve. The results provide a theoretical basis for performance improvement of the valve.