约翰克兰机械密封产品与应用.ppt

IllustratesbasictypesofdistrotionThermaldistortionresultsinwidergapatODoffaces.PressuredistortionresultsinwidergapatID,closingoffatODUndersteadystateconditionsfacescanweartogetherandhaveparallelfacesandrunwellbutcanbeunstablewhenconditionschange,suchasstaticorifpressure/speedchanges.约翰克兰机械密封产品与应用机械密封概述:定义:机械密封(端面密封)--由至少一对垂直于轴线的端面在流体压力和补赏机构弹力(或磁力)的作用下以及辅助密封的配合下,保持贴合并相对滑动而构成防止流体泄漏的装置.基本结构:端面密封磨擦付缓冲补赏和压紧机构辅助密封(二级密封挠性元件)传动机构基本密封点:端面主密封点静环与端盖辅助密封点动环与轴(轴套)辅助密封点端盖与泵体连接密封点此外为了保证和提高机械密封的密封效果延长使用寿命,采取不同端面的组合，增加如冲洗,节流冷却,阻封和杂质过滤等辅助系统.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AnExampleofaCompleteSeal

一个完整密封的例子动环：石墨静环：碳化硅/碳化钨 动环：石墨静环：碳化硅/碳化钨 动、静环的材质Simplyput,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StationaryassemblyRotatingassemblytoseparatethetwoslidingfacestolubricatetheslidingfacestoreducefriction/heatgenerationtopreventfluidleakagetotheatmosphereThesealfacesarelappedveryflat(1to2lightbands).Averythinfluidfilm(3to5microns)isformedandservedthefollowingpurposes:Face,Seat

andSpringsSecondarySeals=0.294?mFluidFilm3to5micronsHumanHairFaceSeat60micronsMechanicalsealhasnormalleakagebutnotvisiblebecausetheliquidattheIDofthefilmwillvaporisedslowlyinverysmallquantity-emissionPrimarySeal–FilmThickness

主密封——膜厚度Mustbe:present-bewaredryrunningstableclean-bewareabrasivewearsymptomsreasonableviscositytemperaturecontrolledacceptab