液压系统回油单向阀压力振荡原因分析及对策  

Cause and Countermeasure of Pressure Oscillation Occurs in Hydraulic System with Check Valve

作　　者：邵森寅[1] 丁川[1] 李佑策[2] 陈兴达[1] 李其波[3] 丁凡[1] 

机构地区：[1]浙江大学流体传动及控制国家重点实验室,浙江杭州310027 [2]中船重工第704研究所,上海200030 [3]胜利油田黄河钻井五公司,山东东营257000

出　　处：《机床与液压》2008年第9期270-272,共3页Machine Tool & Hydraulics

摘　　要：大流量液压控制系统中常在回油路上安装插装式回油单向阀,当回油流量较大时由于该阀阀芯振荡而易引起回油压力波动的现象,通过流场仿真和实验验证,结果表明:油液通过该阀阀口后在出口流道附近形成漩涡出现负压,空气从油液中析出进入控制腔,阻尼孔节流作用丧失,使插装阀芯极易振荡而引起回油压力波动。理论分析和工程实践证明,采用改换控制腔压力引入孔位置可有效解决回油压力的波动现象。Cartridge check vavle is normally set in oil return line. Under large return flowrate, pressure fluctuation resulted from vavle spool oscillation occurs in hydraulic system. Simulation and experiment of flow field of a cartridge check valve were carried out. Both the results show that negative pressure, results from spiral vortex formed at the outlet of valve, causes air to separate from oil and move into control chamber. Hence the orifice fails to take choking effect, and the spool of cartridge check valve is likely to oscillate. Relocating the oil entry point of control chamber is an effective solution to pressure oscillation, which is confirmed by both theory and engineering practice.

关 键 词：液压系统 插装式单向阀 回油压力波动 流场仿真 

分 类 号：TH137.52[机械工程—机械制造及自动化]