约翰克兰西部管道密封培训.ppt

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1、西部管道密封培训JohnCraneTech(Tianjin)Co.,Ltd培训内容概述密封基础知识密封系统知识密封的安装要求密封的失效大致判断与客户技术人员进行交流机械密封基础第一部分ConceptsofMechanicalSeals机械密封概念ShaftProcessFluid密封流体Leakage泄漏Environment环境VesselWall釜壁TheBasicSealingProblem:PreventingLeakage基本的密封问题:防止泄漏ShaftProcessFluid流体流动Leakage泄漏Environment环境Vesse

2、lWall釜壁TheConceptofanEndFaceMechanicalSeal机械密封端面的概念ShaftMovement轴的运动RequiredFeatures必须的特征Smallaxialclearance小的轴向间隙Selfadjusting自调节MatingRing配合环PrimaryRing补偿环SecondarySealingElement辅助密封AFlexibleSealFlexible机械密封Hydrostaticloading流体静力学负荷Secondarysealingelements辅助密封Replaceableparts

3、可替换的部件O-RingO型圈Shaft轴MatingRing配合环PrimaryRing补偿环SnapRing卡环Anti-XRing挡环O-RingO型圈Disk推环Springs弹簧Retainer传动套SetScrew定位螺丝AnExampleofaCompleteSealSimplyput,amechanicalsealis:简单的说,机械密封就是:1.Awearable,stationary,primarysealingelement一个耐磨,静止的密封件2.Awearable,rotating,primarysealingelement一

4、个耐磨,旋转的密封件3.Asecondarysealingelement二次密封4.Amechanicalloadingdevicetopressprimarysealingelements1and2againstoneanother,and使件1和件2相互贴合的机械装置5.Auxiliarycomponentstocompleteseal辅助密封Non-flashing没有闪蒸Flashing闪蒸Parallel平行Converging收敛Diverging发散FaceSeparation密封面分离Shape:形态Gap:间隙Fluid:流体TheS

5、ealingInterface密封接触面Lubricant润滑剂Separation分离面MagnifiedSurfaceA放大面MagnifiedSurfaceB放大面Heat热量TheSealingInterface密封面LubricationPurpose:润滑目的Separatesurfaces分离两个面Preventcontactofhighsurfacepoints防止出现面接触Reducefriction/heatgeneration减少摩擦/生热ProcessFluidActsasLubricantBetweenFaces流体在两个面之

6、间充当润滑剂的过程Gland密封端盖PumpHousing泵腔ProcessFluid工艺流体InvisibleLeakage:不可见泄漏FluidEvaporatesUponReachingAtmosphere微量的泄漏在大气侧蒸发PrimaryRing补偿环MatingRing配合环Gland密封端盖PumpHousing泵腔NoFluidOrDryRunning没有流体或者干运转PrimaryRing补偿环MatingRing配合环WithoutLubrication,FacesRunDryAndOverheat没有润滑干运转导致过热Mating

7、Ring配合环PrimaryRing补偿环HeatGeneration生热Rubbing摩擦ViscousShear粘性剪切力HeatTransfer热传递Conduction传导Convection对流Injection注入Flushing冷冲洗RemovesHeat带走热量ReplenishesCoolCleanLubricatingLiquid补充润滑液PrimarySeal:Flush基本密封:冲洗SingleSealFlushingBy-PassfromDischarge(APIPlan11)单密封通过出口进行冲洗By-passLinefro

8、mPumpDischargetoSealGland从泵出口到密封端盖的管线Discharge