先导式水压溢流阀动态特性的仿真

NUMERICAL SIMULATION ON THE DYNAMIC CHARACTERISTICS OF A TWO-STAGE WATER HYDRAULIC RELIEF VALVE

对一种新型的先导式水压溢流阀进行了动态特性的建模和仿真研究,分析了多种因素对溢流阀动态特性的影响。仿真结果表明,先导阀尾端设置阻尼腔有利于提高先导阀的工作稳定性;在主阀口前设置合适的节流孔可降低主阀口的工作压差,减小阀口的气蚀,提高溢流阀的工作性能和使用寿命;主阀心上腔容积V12、先导阀入口容积V2、溢流阀入口容积V0对溢流阀的动态特性均有较大影响。

The mathematical model for a novel two-stage water hydraulic relief valve is estabilished. Numerical simulation on its dynamic characteristics is analysed. Simulation results clarify that setting damping chamber at the pilot stage is benefit to improve the pilot valve＇s stability. The main valve＇s differential working pressure can be decreased greatly by adding a suitable throttle for the purpose of reducing cavitation, enhancing the valve＇s performance and service life. The results also show that the upper chamber volume V12 of the main valve, the inlet chamber volume V2 of the pilot valve and the inlet chamber volume V0 of the relief valve influence the relief valve＇s dynamic characteristics markedly.