摘要
为了解定量泵液压传动系统的特点,该文针对负载敏感定量泵液压回路中的负载压力变化和主控多路阀阀芯移动,深入研究了定量泵出口压力、负载压力和补偿阀口开度、主控阀芯位移之间的数学关联性,得出了补偿阀口开度变化量与主控阀芯阀口开度变化量之间的解析关系式。研究表明,随着定量泵出口压力增加,出现负载压力波动时补偿阀芯的运动幅度会变小,泵输出压力为6、9和12MPa时,位移变化率分别为0.081、0.142和0.183(输出压力6MPa);0.058、0.110和0.139(输出压力9MPa);0.042、0.079和0.112(输出压力12MPa);而对同一输出压力,随着负载压力变化增加,补偿阀芯位移变化率的变化减小,负载压力变化1、2和3MPa时,补偿阀芯位移变化率依次减小为0.081、0.072和0.064(输出压力6MPa);0.057、0.051和0.046(输出压力9MPa);0.043、0.038和0.034(输出压力12MPa),与试验结果吻合。主控阀芯移动时补偿阀芯的运动分析表明,在定量泵出口压力不变时,补偿阀口开度变化和主控阀等效节流面积改变成正比。研究结果对于机械负载敏感定量泵系统的设计具有一定的借鉴意义。
A type of load pressure sensitive quantitative pump hydraulic circuit was studied, and its working principle was explained. Under the conditions, the research included two situations, which are load pressure change and main control multi-way valve spool movement. By the basic physical equations of the hydraulic units, the mathematical relationship between system outlet pressure Pl, load pressure P2, fixed differential relief valve compensation spool opening Xc and main control spool displacement Xe was obtained; and by the analysis of above mathematical relationship, it was observed that under the situation which main control spool equivalent throttling area Ae keeps still and load pressure P2 changes, fixed differential relief valve compensation spool displacement rate △xc/xc is inversely proportional to a pump＇s system outlet pressure Pl, however, it is proportional to load pressure change ApE; and as the pump outlet pressure pl increases, the fixed differential relief valve compensation spool displacement rate △xc/xc becomes smaller. The experimental results showed that displacement rate △xc/Xc are 0.081, 0.142 and 0.183（output pressure is 6 MPa）; 0.058, 0.1 10 and 0.139（output pressure is 9 MPa）; 0.042, 0.079 and 0.112（output pressure is 12 MPa） respectively. For constant pump outlet pressure pl, the movement range of the fixed differential relief valve compensation spool becomes larger, and that the fixed differential relief valve compensation spool displacement rate slope △xc/xc/△p2 has the trend to become smaller as load pressure change Ap2 increases. The theoretical analysis and experimental results （when ApE are 1, 2, 3 MPa, △xc/xc/△p2 are 0.081, 0.072 and 0.064（output pressure is 6 MPa）; 0.057, 0.051 and 0.046（output pressure is 9 MPa）; 0.043, 0.038 and 0.034（output pressure is 12 MPa） respectively under pl equals 6, 9, 12 MPa） are consistent. Others, as the fixed differential relief valve compensation spool throttling ports generally is designed as U or V par
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2013年第13期38-45,共8页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金资助项目(50875122)
江苏省科技支撑项目(BE2011187)
关键词
泵
压力
阀
负载
位移变化率
数学关系
pumps, pressure, valves, load, displacement rate, mathematical expression
