先导式电液比例溢流阀静态特性仿真与试验

Simulation and Experiment of Static Characteristics of Pilot-operated Electro-hydraulic Proportional Relief Valve

先导式电液比例溢流阀是用来控制系统中油液压力的压力控制阀,可根据工况要求以电信号控制电磁力从而实现对液压系统的压力控制,由先导阀、主阀和手调安全阀组成。由于控制阀口通流状态较为复杂,采用流量经验公式和传统的液动力公式难以准确计算阀口通流量和阀芯所受液动力,数学模型计算结果与试验存在较大差异。为了较为准确地获得溢流阀的静态特性,采用Fluent软件分别对主阀和先导阀进行流场仿真计算,获得不同阀口开度和压差下的阀芯受力和阀口通流量。利用插值方式得到阀芯受力和阀口通流量的插值模型,据此求解静态数学模型,得到溢流阀静态特性曲线。结果表明,采用插值模型求解所得静态特性曲线与试验曲线的吻合度更高。

Pilot-operated electro-hydraulic proportional relief valve is a pressure control valve that is used to control the oil pressure in the system.It can control the electromagnetic force with electric signal according to the requirements of working conditions,so as to achieve the pressure control of the hydraulic system,and is composed of pilot valve,main valve and hand-adjustable safety valve.Due to the control valve port flow state is complex,the use of flow experience formula and the traditional hydrodynamic formula is difficult to accurately calculate the orifice flow and spool hydrodynamic force,resulting in large differences between the mathematical model calculations and the experiments.In order to accurately obtain the static characteristics of the relief valve,the Fluent software is used to simulate the flow field of the main valve and pilot valve to obtain the spool force and orifice flow under different orifice openings and differential pressures.The interpolation model is obtained by interpolating the spool force and orifice flow,according to which the static mathematical model is solved to obtain the static characteristic curve of the relief valve.The results show that the static characteristic curve obtained from the interpolation model is more consistent with the experiment curve.