流量稳定阀的动静态性能

为了研究一种补偿阀芯前置式流量稳定阀的静态和动态性能,计算了主阀腔平衡压力p1,发现在稳定阀其他节流参数不变的情况下其值可以看作是系统输入压力p0与负载压力p2的线性组合;并在此基础上得出了补偿阀芯位移率Δxpc/xpc与静态参数之间的物理模型.利用AMESim液压系统开发库HCD建立了流量稳定阀动态模型,分析了不同参数对其动态性能的影响,结果表明：增大p0可以提高负载运行效率,并使外部和内部反馈压力差增大,但同时会造成负载运行不稳定;增大负载质量M,内部和外部的反馈压力差会下降,但负载动态稳定性得到一定的改善.增大弹簧刚度K,负载动态变化过程开始时间会延迟,且负载运行趋向不稳定;K的变化会影响内部反馈压力差,但对外部反馈压力差的稳态值几乎无影响;补偿阀芯左侧圆柱面直径dt对负载动态性能的影响很小.

Dynamic and static performance of flow stability valve

To study the static and dynamic performances of flow stability valve, main chamber balance pressure P1 was calculated, and under other throttling parameters keeping still ,P1 can be regarded as a linear combination of system input pressure P0 and load pressure P2. On the basis ofpx, the mathematical relationship between compensation spool displacement rate Δxpc/xpc and static parameters was obtained, and it can be found that compensation spool is not sensitive to the change of p2, however, it is sensitive to P0 change. The valve dynamic model was built and the dynamic performances were simulated based on HydraulicLabraries in AMESim HCD, and for P0 increasing, load motion efficiency can be improved, and external and internal differential pressures become larger when the motion of load appears unstable. For M increasing, load speed and load acceleration decrease, and internal and external differential pressures all decrease, when the stability of dynamic transition is improved. For spring stiffness K increasing, load dynamic change process start time is backward delayed by a period of time, and for internal differential pressure decreasing, external differential pressure steady value almost remains. The influence of changing diameters dton load dynamic performance is limited, and the change of d1 almost has no influence on external differential pressure. However, with dtincreasing, internal differential pressure has a slight increase.