JASO M321-1999 汽车零部件—空调软管总成

JAPANAUTOMOBILESTANDARDJAS0M321:1999ItemAutomotiveparts-AirconditioninghoseassembliesApplicableSpecificationsPerformance1.ScopeThisStandardspecifiesrequirementsforhoseassembliesusedtoconducttheliquidandgaseousRefrigerant134a(hereinreferredtoasR134a)inairconditioningsystemsforautomobiles.PressureproofINoleakageorotherabnormalities2.ApplicablePublicationsThefollowingpublicationsformapartofthisStandardtotheextentspecifiedherein.Thelatesteditionofallpublicationsshallapply.8.2JISK6259JISK9703JISK6259BurststrenathINoburstorleakaaewhenspecifiedpressureapplied3.TypesTypesofhoseassemblies8.3TestingMethodsofResistancetoOzoneCrackingforVulcanizedRubber2,2,4-TrimethylpentaneJUN93RI34aRefrigerantAutomotiveAirConditioningHoseILengthchangeI-4-+2%Rateofchargeinouterdiameter20%orlessNegativepressureNoswelling,cracking,peeling,cracksoninnersurfacewhenaredividedaccordingtotheirlocationasshowninTable1Table1TvDe8.48.5ITypeILocationIColdresistanceINocracksAirtightasspecifiedin8.1IHighpressureILowPressure1Betweencompressordischargeandexpansionvalve1Betweenexpansionvalveandcompressorintake8.64.ClassificationbyRefrigerantPermeabilityHoseassembliesareclassifiedbypermeabilityofrefrigerantasfollowsClassI:9.7kg/m2/yearorbelow(Lowpermeationspecification)ClassII:29kg/m2/yearorbelowOz0neresistanceINocracksAirtiahtasspecifiedin8.15.ShapeHoseassemblyspecimensusedintestingshallbestraightsections8.76.PerformanceTestsshallconformto8TestMethods,andshallsatisfytherequirementsspecifiedinTable2.IimpulseIAirtightasspecifiedin8.1RefrigerantpermeationClassI:9.7kg/m2/yearorbelowClassII:29kg/m2/yearorbelowTable2Performance8.98.10MoistureingressionCouplingintegrityILeakaaeINoleakaaeorotherabnormalitiesla.iI0.15g/cm2/yearorless8.13Gasloss(maximumweightloss):log8.14TestOption1or2NoaudibleorvisibleindicationofleakageIHeatagingINocracksoninner/outersurfacesI8.8IExtractionJAS0M321:19997.GeneralTestConditionsThetestlaboratoryshallbemaintainedat23C12Candtherelativehumidityshouldbe50%15%Testspecimensshallbe:a)300mm-1,000mminfreelengthb)Prepared24hoursormoreinadvancec)Keptatroomtemperaturefor3hoursormorebeforetesting8.TestMethodsHoseassembliesshallbesubjectedtothefollowingtestsasspecified8.1AirtightSubmergeinwaterfor5minutesandapplythepressurespecifiedinTable3bydehumidifiedairorinertgas.Checkforleakage.Table3AirtightTestPressure(Gaugepressure)Unit:MPaIType1AirtighttestpressureIIHighpressure13.53ILOWDressureI1.O8I8.2PressureFillwithnormaltemperaturewater,removeair,andgraduallyapplythepressurespecifiedinTable4for5minutes.Checkforleakage.Table4TestPressure(Gaugepressure)Unit:MPaITvDeITestDressureIIHighpressure15.30IILOWDressureI1.67I8.3BurstingFillwithnormaltemperaturewater,removeair,andapplypressureataraterequiring1minuteormoretoreachthepressurespecifiedinTable5.Checkforburstingorleakage.Table5BurstingTestPressure(Gaugepressure)Unit:MPaIType1BurstingtestpressureIIHighpressureI13.7ILOWpressure112.08.4LengthChangePlacethehoseassemblyhorizontally.Fixoneend,leavetheotherendfreeandclosewithasealingstopper.Applypressureof98kPa(gaugepressure)fromthefixedside.Marka200mmlinelength-wisealongthehoseassemblymidwaybetweenthetwoendstoobtaintheinitiallength.ApplythepressurespecifiedinTable3for1minuteandmeasurethelengthoftheline.Calculatethelengthchangeasfollows.x10012-I,I,Al=WhereAl:Lengthchange(%)I,:Initiallength(mm)I,:Lengthafterpressurized(mm)2JAS0M321:19998.5NegativePressureBendintoaU-shapeataradius(r)5timesthatofthehoseouterdiameterasindicatedinFig.I.Measuretheouterdiameterofthecenteroftheflattenedsectionandmarkitwithaline.Reducepressureto81kPavacuumdegreesfor2minutes.Measuretheouterdiameterofthemarkedsectionandcalculatetherateintheouterdiameterasspecifiedbelow.Cutthehoselength-wiseandcheckforinternalswelling,peeling,orcracks.Ad(%)=x100diWhereAd:Changerateinouterdiameter(%)d,:d,:Outerdiameterbeforepressurereduction(mm)Outerdiameterafterpressurereduction(mm)p+Fig.1BendU-Shape8.6LowTemperatureFill70%ofthehoseassemblycapacitywithliquefiedR134aatroomtemperature.Heatinathermostatictestchamberat70C12Cfor48hours.Cooltoroomtemperatureand,withthehoseassemblykeptstraight,placeinathermostatictestchamberat-30C12Cfor24hours.Removeandimmediatelyapplytoamandrelwithadiameter8timesthatofthehoseouterdiameter.Take4to8secondstobendthehoseassembly180aroundthemandrelasindicatedinFig.2.RemovetherefrigerantandapplythepressurespecifiedinTable3tocheckforleakageandinternal/externalcracksorotherabnormalities.TestspecimenatfreepositionITestIPMardrelsaecimenbentat180/Fig.2BendingTechniqueforLowTemperatureTest8.7OzoneResistanceWindthehoseassemblyoncearoundamandrelwithadiameter8timesthatofthehoseouterdiameter.Placeinanozonetestchamberandapplyaconcentrationof50ppm15ppmat40C12Cfor72hours.Removeandcheckthesurfaceforcracksandotherabnormalitieswitha7xmagnifyingglass.Applytheairtighttestspecifiedin8.1.Testequipmentandozoneconcentrationcontrol(measurement)shallconformto4ofJISK6259(OzoneResistanceTest).8.8HeatAgingWindthehoseassemblyoncearoundamandrelwithadiameter8timesthatofthehoseouterdiameter.Heatinathermostat