液压与气动2025，Vol.49Issue(5)：29-35,7.DOI:10.11832/j.issn.1000-4858.2025.05.004
考虑径向间隙与回油压力的对称均等正开口液压滑阀压力特性分析
Pressure Characteristics Analysis of Hydraulic Spool Valves with Symmetric and Equal Underlaps Considering Radial Clearance and Return Pressure
摘要
Abstract
On the basis of considering the return pressure and radial clearance,mathematical models of dimensionless pressure characteristics for both matching and mismatching symmetric underlaps spool valves are established.The dimensionless pressure characteristics curves of the spool valve are obtained and compared with experimental results.The effects of valve matching,return pressure and radial clearance on the accuracy of the mathematical models are analyzed.The results indicate that when the mathematical model is set to neglect the mismatch of the spool valve,the return oil pressure and the radial clearance,the maximum calculation errors are 27%,16%and 6.5%respectively,while the zero position calculation errors are 27%,7%and 2%.Specifically,neglecting the radial clearance leads to increasing pressure calculation errors at ports A and B when the spool displacement exceeds 75%of the underlaps.Neglecting the return pressure and the mismatching characteristics of the spool valve also increases the pressure calculation errors at ports A and B within the range of positive opening,with the maximum errors of 78%and 50%respectively.The zero position's calculation errors at the working ports are significantly increased when the mismatching characteristics of the spool valve are not considered.The model can provide theoretical support and reference for the design of symmetric spool valves.关键词
液压阀/正开口/对称不匹配/回油压力/径向间隙/无因次压力Key words
hydraulic valve/underlaps/symmetric mismatch/return pressure/radial clearance/dimensionless pressure分类
机械工程引用本文复制引用
陈景,潮群,汪文涛,刘成良..考虑径向间隙与回油压力的对称均等正开口液压滑阀压力特性分析[J].液压与气动,2025,49(5):29-35,7.基金项目
国家自然科学基金(52475064) （52475064）
上海商用飞机系统工程联合研究基金(CASEF-2023-AM11) （CASEF-2023-AM11）
