机械密封原理

AESSEAL®初级培训教程PRESENTEDBYA.E.S.ChinaEngineeringLtd.Copyright1997A.E.S.EngineeringLtd.什么是机械密封？机械密封也称端面密封，其至少有一对垂直于旋转轴线的端面，该端面在流体压力及补偿机械弹力的作用下，加之辅助密封的配合，与另一端面保持贴合并相对转动，从而防止流体泄漏。Copyright1997A.E.S.EngineeringLtd.机械密封的组成A.由静环和动环组成的一对密封端面，也称摩擦副。B.以弹性元件为主的补偿缓冲机构（弹簧、波纹管）。C.辅助密封圈(O形、V形、橡胶皮碗等）D.使动环和轴一起旋转的传动机构。E.其它零部件（轴套、压盖、定位销、垫片等）Copyright1997A.E.S.EngineeringLtd.为什么要使用机械密封密封性能好使用寿命长轴或轴套无磨损轴功率消耗小不需经常调整应用范围广机械密封分类单端面和双端面内装式和外装式平衡型与非平衡型弹簧内置式和弹簧外置式弹簧式和波纹管式普通两部件式和集装式多（小）弹簧型和单（大）弹簧型Copyright1997A.E.S.EngineeringLtd.机械密封原理液膜的形成摩擦/热杂质/固体颗粒工艺流体动环静环密封腔体Copyright1997A.E.S.EngineeringLtd.轴机械密封成功的关键“形成并保持一种稳定的液膜”Copyright1997A.E.S.EngineeringLtd.Copyright1997A.E.S.EngineeringLtd.最初的轴封—盘根缺点：•泄漏量大（每分钟约7滴)•轴磨损严重•轴功率损耗大•经常需要调整•使用寿命短优点：价格低廉安装方便Copyright1997A.E.S.EngineeringLtd.第一代机械密封（分离式、非平衡型、单个大弹簧）优点：初始价格较低缺点：•容易产生人为安装误差•弹簧和介质接触易堵塞•O形圈及动静环材质不过关•动环受弹簧力不均•端面比压受介质影响大•使用寿命低Copyright1997A.E.S.EngineeringLtd.第二代机械密封（分离式、多弹簧）优点：•动环受弹簧力均匀•价格较低缺点：•同第一代机械密封Copyright1997A.E.S.EngineeringLtd.第三代机械密封（卡式或集装式）优点：•无人为安装误差•弹簧不与介质接触不会堵塞•优异的O形圈及动静环材质•密封环有良好的补偿性•O形圈无磨损•设计寿命3年Copyright1997A.E.S.EngineeringLtd.泵的基本结构油封轴轴承压盖泵座地脚螺栓密封腔体泵体叶轮叶轮螺母填料（机械密封）压盖轴承箱填料（机械密封）轴承Copyright1997A.E.S.EngineeringLtd.集装式机械密封的结构动环静环静环胶圈弹簧防转销钉定位环驱动螺钉唇封冷却孔压盖压盖垫片弹簧套桶轴套轴套胶圈套筒胶圈补偿环SAI™动环组件和L型静环Copyright1997A.E.S.EngineeringLtd.NCE™-应用于非化学工况的外置式动环组件Copyright1997A.E.S.EngineeringLtd.—代替盘根的最佳集装式密封Copyright1997A.E.S.EngineeringLtd.CONVERTORⅡTMCopyright1997A.E.S.EngineeringLtd.SCUSITM短型单端面集装式机械密封Copyright1997A.E.S.EngineeringLtd.CURCTM单端面集装式机械密封SMSSTM单端面整装固定型集装式机械密封Copyright1997A.E.S.EngineeringLtd.CDSATM双端面集装式机械密封Copyright1997A.E.S.EngineeringLtd.Copyright1997A.E.S.EngineeringLtd.Bi-MetalCDSATM具备特殊合金部件的双端面集装式机械密封RDSTM剖分式机械密封Copyright1997A.E.S.EngineeringLtd.Copyright1999A.E.S.EngineeringLtd.DMSFTM双端面整装固定型集装式机械密封金属波纹管系列密封Copyright2000A.E.S.EngineeringLtd.……...…….....IncreasesSealLife50%MoreBellows……………TM1250%ExtraIndustryStandardCopyright1997A.E.S.EngineeringLtd.PCPSTM螺杆泵系列密封Copyright1997A.E.S.EngineeringLtd.搅拌器系列密封FLOWFLOWDualSealSealReturnPipeSealFeedPipeVesselCopyright1997A.E.S.EngineeringLtd.密封辅助系统系列