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O形圈技术交流ZHEN-O2020/3/5AIGINDUSTRIESO形圈技术交流ZHEN-O2020/3/52密封件分类O形圈尺寸O形圈材料O形圈沟槽设计O形圈失效O形圈技术交流ZHEN-O2020/3/53密封件的分类唇形密封件(U/V/Y)成形密封件油封挤压密封件(组合密封,O形圈,D形圈等)接触式密封机械密封基础密封件磁流体密封动密封非接触式密封迷宫式密封膜片密封绝缘密封密封波纹管涂胶金属垫片金属密封垫金属O形圈金属平垫片静密封O形圈,星形圈纸质密封垫非金属密封垫橡胶密封垫液体密封胶O形圈技术交流ZHEN-O2020/3/54Orings:Anelastomericsealofhomogenouscompositionmoldedinonepiecetotheconfigurationofatoruswithacircularcross-section.O形圈:靠模具成形,由同质物合成的断面为圆形的圆环形弹性体密封件。TheO-Ringisusedasadynamicorstaticseal,usuallyinstalledinamachinedgroove.O形圈常用于静密封或动密封,一般是安装在一个机械加工的沟槽内。O形圈定义O形圈技术交流ZHEN-O2020/3/55O形圈的尺寸与标准OD-外径ID-内径W(C/S)-线径标准:AS568A美国标准BS1806英国标准ISO3601国际标准BS4518英国标准ISO6149-2国际标准NFT47-501法国标准JIS2401日本工业标准GB3452中国国家标准O形圈技术交流ZHEN-O2020/3/56O形圈的尺寸与公差ISO3601-1/GB3452.1线径mm公差+mm-1.800.081.80–2.650.092.65–3.550.103.55–5.300.135.30–7.000.157.00–8.000.188.00–10.000.2110.00–12.000.2512.00-根据要求O形圈技术交流ZHEN-O2020/3/57O形圈的材料名称ISO1629缩写ZHEN-OCODESHOREACOLOR丁腈橡胶NBRNN7096AA70BLACKN7041AA70BLACKN9000AA90BLACK氢化丁腈橡胶HNBRHH7000AA70BLACKH7000AE70GREEN聚丙烯酸酯橡胶ACMPP7000AA70BLACK氯丁橡胶CRCC7000AA70BLACK三元乙丙橡胶EPDMEE7050AA70BLACKE7041AA70BLACK硅橡胶VMQSS7000AB70RUSTSS7031AB70RUST氟硅橡胶FVMQFF7004BU70BLUE丁基橡胶IIRII7000AA70BLACK丁苯橡胶SBRBB7000AA70BLACK天然橡胶NRAA7000AA70BLACK氟橡胶FKMVV7500AA75BLACKVV7500AC75BROWN高氟橡胶ETPVV8033AA80BLACK四氟乙丙橡胶AFLASVV7045AA70BLACKO形圈技术交流ZHEN-O2020/3/58O形圈密封的种类StaticSeal:Asealformedbetweenmatingpartsthatdonotmoverelativetoeachother.静密封:密封件安装在无相对运动的组件之间。*Axialsqueeze:sidetosidecompression轴向挤压*RadialSqueeze:I.D./O.D.compression径向挤压•DynamicSeal:Asealineachoneormoreofthematingcomponentsmovesrelativetoeachother.•动密封:密封件安装在有相对运动的组件之间。•*Reciprocating:axialmovement往复运动•*Rotatory:curvalinearmovement旋转运动O形圈技术交流ZHEN-O2020/3/59术语PartingLine:Aridgeonthepartwerethemoldplatesmeet.分模线:模板结合处在产品上留下的痕迹。Flash:hincrosssectionofresidualrubberformedatthemoldpartingline.飞边:在分模线处残留在断面上的多余材料。Shrink:thedimensionalchangethatoccursinarubberpartasitcuresduringmolding.2%-4%duringmolding,additional1%ifpostcured.收缩率:橡胶在模腔内成型时产生的相对于模具尺寸的差异。在模腔内的收缩为2%-4%,若采用快速硫化,收缩率增加产1%。Hardness:Durometerpointsshore“A”ismostwidelyused硬度:邵氏硬度(肖氏硬度)是最普遍采用的描述方法。O形圈技术交流ZHEN-O2020/3/510CompressionSet:Ameasurementofthelossofrecoverywhentestedataspecifieddeflection,temperatureandtime.压缩变形:描述在规定的压缩量,温度和时间下,材料弹性的损失。TensileStrength:Theforcerequiredtoruptureaspecimen.扯断强度:将标准试样拉断时所需的力。Modulus:Theforcerequiredtoreachapredetermineddeformation.模量:达到规定变形量所需的力。O形圈技术交流ZHEN-O2020/3/511O形圈沟槽设计ThebestO-Ringsintheworldwon’tworkiftheglandthey’reinisn’tdesignedright.没有正确的沟槽,再好的O形圈也不能发挥作用大约25-50%的泄漏都与沟槽设计有关。其余的影响因素为:密封材料选择错误,密封件损坏,磨损等–完整的沟槽设计/分析包含非常多的数字分析Stretch,Squeeze,&Fill拉伸,压缩,填充率ToleranceStack-ups尺寸公差与过盈量设计O形圈技术交流ZHEN-O设计考虑因素1.MaterialSelection材料的选择2.ProperSqueeze适当的压缩3.GlandFill沟槽填充率4.Stretch拉伸5.PressurevsClearance施压与释压6.Eccentricity&SideLoading偏心与侧向载荷7.Tolerances尺寸公差8.SurfaceFinish表面粗糙度9.SharpCorners尖角O形圈技术交流ZHEN-OSQUEEZE/压缩Affectsresiliencypropertyofmaterial影响材料的弹性Toolittleshortensseallife缩短密封件的使用寿命Toomuchoverstressesmaterial材料内部应力过大25%optimumnominaldesignsqueeze较适当的名义尺寸压缩量为25%recommendedsqueezedifferentfordifferentglandconfigurationsanddifferentsizes推荐的压缩量因尺寸和沟槽结构的不同有所区别O形圈技术交流ZHEN-OSQUEEZE/压缩Compressionexpressedasapercentageofthefree-statecross-sectionalthickness.(O-RingC/S)O形圈截面直径-GlandDepth沟槽深度(O-RingC/S)O形圈截面直径FaceSeal端面密封:20-30%StaticMale/Female静密封:18-25%Reciprocating往复密封:10-20%Rotary旋转密封:0-10%O形圈技术交流ZHEN-OGLANDFILL/沟槽填充率Glandvolumevs.O-Ringvolume(O-RingVolume)O形圈体积(GlandVolume)沟槽容积About25%voidspaceor75%nominalfill大约25%的空隙或75%的名义填充率Needspaceingroovetoallowforvolumeswell,thermalexpansion,andincreasingwidthduetosqueeze沟槽内需要预留空间给O形圈膨胀,散热,和由压缩引起的宽度增加Narrowergrooveforsealingvacuumorgas在真空密封或是密封气体时,要将沟槽变窄O-RingcangetsqueezedoutintoclearancegaporgetsqueezedintwodirectionsO形圈有可能被挤入沟槽间隙或受到双向的挤压O形圈技术交流ZHEN-OSTRETCH/拉伸%insidediameterstretchinstalledingroove内径拉伸装入沟槽(GrooveDiameter)沟槽底径-(O-RingID)O形圈内径(O-RingID)O形圈内径Generalruleis0-5%常规要求0-5%Excessivestretchcanoverstressmaterial过度拉伸会使材料产生过大的内部应力Thinscrosssectionandreduces%squeeze拉伸会减小O形圈断面的和降低压缩变形%crosssectionreductionduetostretchabouthalfofthe%IDstretchO形圈断面减小的百分比约为内径拉伸百分比的一半O形圈技术交流ZHEN-OSTATICGLANDDESIGNS/静密封FACE端面密封RADIAL(MaleandFemale)活塞与活塞杆密封DOVETAIL/HALFDOVETAIL燕尾/半燕尾BOSS螺丝密封CRUSH压垮密封O形圈技术交流ZHEN-OFACESEAL端面密封•NOSTRETCH无拉伸•INTERNALPRESSURE:压力来自内部DESIGNTOGROOVEOD设计基准为外径一侧•EXTERNALPRESSURE:压力来自外部DESIGNTOGROOVEID设计基准为内径一侧•0CLEARANCE:HIGHPRESSURE•0间隙:高压•20-30%SQUEEZE20-30%压缩量O形圈技术交流ZHEN-ORADIALSEAL活塞与活塞杆密封•0-5%STRETCH0-5%拉伸•20-30%SQUEEZE20-30%压缩变形•CLEARANCEGAP有间隙存在O形圈技术交流ZHEN-ODOVETAIL/燕尾槽•INTERFERENCEFIT•过盈配合•LIDAPPLICATIONS•运用于盖子式的密封•EXPENSIVEMACHINING•沟槽加工复杂O形圈技术交流ZHEN-OHALFDOVETAIL/半燕尾槽•INTERFERENCEFIT过盈配合•LIDAPPLICATIONS运用于盖子式的密封•EASIERTOMACHINE(RelativetoDovetail)相对于燕尾槽较容易加工O形圈技术交流ZHEN-OBOSSSEALS螺丝密封•Stretch,Squeeze,Fill拉伸,压缩,填充率•HighPressure(3,000psi)高压(3,000psi)•Industrial工业用•Military军用MS33656fitsMS16142&MS33649bossesO形圈技术交流ZHEN-OCRUSHSEAL压垮密封YX•45DEGREEANGLE45度导角•X=Y=1.321xCSO形圈技术交流ZHEN-ODYNAMICDESIGN/动密封RECIPROCATING往复FLOATINGPNEUMATIC气浮
本文标题:O形圈技术
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