基础振动下电磁换向阀换向灵敏性研究

Study on Commutation Sensitivity of Electromagnetic Directional Valves under Base Vibration

针对基础振动引起阀芯瞬态液动力和电磁力的变化,进而影响电磁换向阀换向灵敏性的问题,建立基础振动下电磁换向阀阀芯动力学模型,实验验证该模型的正确性。仿真分析基础振动参数和电磁阀结构参数对换向时间的影响。得到以下结论:基础振动幅值和频率的增大会降低电磁换向阀换向灵敏性;当阀进出口压差为0.6 MPa时,随着阀芯质量的增大,电磁阀换向时间逐渐延长;随着阻尼系数和弹簧刚度的减小,电磁阀换向时间逐渐减小;同时得到了电磁阀在不同进出口压差时的换向时间减小区域和延长区域。研究为基础振动下电磁换向阀的选型和设计提供了一定的理论参考。

Base vibration can cause the transient changes of the hydrodynamic and electromagnetic forces of the valve spools,which affects the reversal sensitivity of the electromagnetic reversing valves.In this paper,the dynamic model of the electromagnetic valve spool is established,and the correctness of the model is verified by experiments.The influence of the base vibration parameters and the structural parameters of the solenoid valve on the commutation time is analyzed.It is concluded that the increase of the amplitude and frequency of the base vibration will reduce the sensitivity of the electromagnetic reversing valve.When the difference between the inlet pressure and outlet pressure reaches 0.6 MPa,the commutation time of the solenoid valve is gradually extended with the increase of the mass of the spool.With the decrease of the damping coefficient and spring stiffness of the spool,the solenoid valve commutation time is gradually reduced.In addition,the commutation time reduction area and the extension area of the valve at different inlet-outlet pressure differences are obtained.This study may provide some theoretical reference for the selection and design of the electromagnetic directional valves under foundation vibration.