位移-流量反馈式比例阀先导液阻匹配策略研究  

Research on Matching Strategy of Pilot Hydraulic Resistance for Proportional Valve Based on Displacement-Flow Feedback

作　　者：赵瑞豪 袁祥 石慧婷 柴玮锋 ZHAO Ruihao;YUAN Xiang;SHI Huiting;CHAI Weifeng(School of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan Shanxi 030024,China)

机构地区：[1]太原科技大学机械工程学院,山西太原030024

出　　处：《机床与液压》2024年第14期22-27,共6页Machine Tool & Hydraulics

基　　金：山西省青年基金项目(202203021222193);太原科技大学校基金(20222116)。

摘　　要：高水基比例阀先导液阻桥路直接影响主阀的控制特性,多功能、多类型液阻构成的复杂先导液阻网络成为比例阀设计的关键。采用数学建模、流场仿真以及试验研究相结合的方式分析位移-流量反馈式高水基比例方向阀先导液阻桥路的液阻特性,考虑了主阀进液阀芯和阀套之间环形间隙的流量泄漏。结果表明:当环形间隙面积一定时,位移反馈槽宽度越大,位移反馈节流控制线性度越好,然而,位移反馈槽宽度越大,先导液桥流量需求越大,高速开关阀组匹配设计难度越大;回液液阻对液桥起背压作用,回液液阻尺寸越小,背压效果越好,位移反馈槽节流控制线性度越差。根据流场仿真结果,综合匹配设计高速开关阀组及进液液阻,通过试验验证了先导液阻网络各液阻尺寸匹配策略的正确性。The pilot hydraulic resistance bridge of the high water-based proportional valve directly affects the control characteristics of the main valve,and the complex pilot hydraulic resistance network composed of multi-function and multi-type hydraulic resistance becomes the key to the design of proportional valve.The mathematical modeling,flow field simulation,and experimental investigation were used to analyze the hydraulic resistance characteristics of a displacement-flow feedback high water-based proportional directional valve pilot bridge.Flow leakage from the annular clearance between the valve spool and valve sleeve was considered.The results show that when the annular gap area is constant,the larger the displacement feedback groove width is,the better the displacement feedback throttle control linearity is.Nevertheless,the larger the displacement feedback groove width is,in the higher for pilot fluid bridge flow requirements is,the more difficult of the matching design of high-speed switching valve set is.The back pressure generated by the hydraulic bridge against the return resistance,the smaller the size of the return resistance is,the better the back pressure effect is,and the worse the displacement feedback groove throttle control linearity is.Based on the flow field simulation results,the design of the high-speed switch valve set and the inlet resistance for the hydraulic bridge was determined through a comprehensive matching process.The effectiveness of each approach for matching the size of hydraulic resistances in the pilot hydraulic resistance network was confirmed through experimental validation.

关 键 词：先导液阻 位移-流量反馈 比例方向阀 液阻匹配特性 

分 类 号：TH137[机械工程—机械制造及自动化]