石油机械中O形密封圈的动密封特性分析  

Analysis of Dynamic Sealing Characteristics of O-ring in Petroleum Machinery

作　　者：莫丽[1] 王军[1] 管西旗[1] 

机构地区：[1]西南石油大学机电工程学院

出　　处：《石油机械》2014年第1期103-107,共5页China Petroleum Machinery

基　　金：国家自然科学基金重点项目"气体钻井技术基础研究"(51134004);国家自然科学基金项目"基于钻井系统动力学的深海钻井升沉补偿系统机理研究"(51274171)

摘　　要：目前对往复运动的O形密封圈密封特性的研究较少,而O形密封圈用于往复动密封时其工况更恶劣。鉴于此,建立了O形密封圈的有限元模型,分析了其在往复动密封中的密封性能,并对影响其动密封特性的运动速度、介质压力、预压缩率和摩擦因数进行了分析。分析结果表明,在往复动密封中,O形密封圈内部应力随时间变化而产生波动,在交变应力作用下比在静密封中更易失效;O形密封圈主接触面的最大接触应力并不随速度的增大而线性变化;预压缩率与摩擦因数对O形密封圈外行程密封性能影响较小,而对其内行程密封性能影响较大;O形密封圈在外行程中的密封性能优于内行程。There is relatively little research on the sealing property of O-ring in reciprocating motion. The operat- ing condition is severe when O-ring is used in reciprocating motion. Therefore, the finite element model of O-ring was established. Its sealing property in reciprocating dynamic sealing was analyzed. The motion velocity, medium pressure, pre-compression rate and friction factor which affect the dynamic sealing property of O-ring were analyzed. The findings show that in reciprocating dynamic sealing, the stress within O-ring is of fluctuating variation with time. It is easier to fail than in static sealing due to the effect of alternating stress. The maximum contact stress of O-ring＇ s main contact surface does not change linearly with the increase of velocity. The pre-compression rate and friction factor have slight effect on the sealing property of O-ring＇ s outer stroke, but they have considerable effect on that of its inner stroke. The sealability of O-ring in outer stroke is better than in inner stroke.

关 键 词：O形密封圈 往复动密封 密封特性 有限元模型 接触应力 

分 类 号：TE953[石油与天然气工程—石油机械设备]