差压法检测微泄漏及其检测准确度分析

3,,,,1,,,,,,,,2,2(),11:rCC=V/(nRT)(1)VnRT,:p=p0e-t/T0(2)9706233,430074p0ptT0T0=rC=rV/(nRT)(3)22p2t,,,,,pV=nRT:p0V=pV+paQt(4)paQtp=p0-p=QtPa/V(5)(5)p2Qtp2V,343p2Qt:1),Vr,,,2),9219981,,V,p4p\|V3:,,,,;,,,,,,,,,55:,,,,t1;t2;,,t3,,(),,;,,4,p1,pe,(),()p=p1+pe(6)(6),p2Qt66p2Qt6pQt:pe0,12,1,pe0,13,2,1(2)p0,,,:1)2),3),4),,:1),,2),,(5)2,,,,,3),,4),,t3,,,(5),,,:03333PC,,PCRS485/422,,1,,,,,,,,,,,,,,,(),397052033,471039185,(),,,,,,,,,,,,,,,,1),,2),,,,,,,,,215Pa,1MPa,1%5,,:1min;;10Pa;,,,1..,19882..,19923..,19931319981AbstractandKeywordsinEnglishResearchforPressure2FlowCharacteristicsofFlowControlCircuit(9)AbstractTheconceptanddescribewayofpressure2flowcharacteristicsofflowcontrolcircuitisdiscussedinthispaper.Fivetypicalgraphesofthecharacteristicsaregivenandanalyzed.KeywordsFlowcontrolcircuitPressure2flowcharacteristicsTheDesignandStudyonAMulti2FunctionCompositeCylinderandItsApplica2tionUnderwaterManipulators(14)AbstractTheworkingfeatureandconstructionaldesignofakindofcompositecylinderwithmulti2functonisintroduced.Atpresentthiskindofcompositecylinderhasbeensuccessfullyappliedtounderwatermanipulatorswhichweredesigneddo2mestically.KeywordsHydraulicCylinderUnderwatermanipulatorHydraulicServoSystemforAdjustTheClearanceofBlowMouldingDie(20)AbstractDuringblownmouldingplasticvessel,productwithevenwallthicknessispledgedtobeproductedbyadjusttheclearanceofdiethatmakesthepavisionhaddif2ferentwallthicknesswhichisdemandedbytheproduct.Amulit2pathshydraulicservosystemforadjustextruderheadwithawallthicknesscontrolunitonaxialandradialisintroducedinthispaper.KeywordsBlowmouldingWallthicknesscontrolHydraulicservoSmallLeakageDetectionPrincipleofDifferentialPressure(29)AbstructInthisresearchaphysicalandmathematicalmodelofsmallleakageasconcernedasthesmallleakagedetectionofdiskbrakeisbuilt.Asmallleakagedetec2tionprincipleofdifferenticalpressureisputforwardbasedonthismodel.Thesourceofdetectionerrorisanalyzedandthecorrespondingmethodoferrorscompensationisgiven.KeywordsSmallleakageDifferenticalpressuremethodErrorcompensationHydraulicParametersComputerAidedOn2LineMonitorandTestSystem(31)AbstractAhydraulicparameterscomputeraidedon2linemonitorandtestsystemwhichbasedontwo2stagedistributedcomputercontrolmodeisintroduced.Thesys2temcomposedbyaPCmanagementcomputer,acommunicatingconnectboardandintelligentinstrumentscouldconducthydraulicparametersmonitorandtestautomati2cally.ThePCcontrolthewholetestprocedureon2linebyRS485/422standardserialdatacommunicationandprocessthetestingdatabymathematicalmethods.Testre2portsareprintedandcurvesareplottedautomatically.KeywordsComputerDistributedcontrolHydraulicparametersTestAuto2motionResearchforTheBasePressureinTheImpulseTestforGearPump(35)AbstractInthispaper,theinfluenceofthepumptobetestandthesystemisre2searchedthatismadebythebasepressureintheinpulsetestfordurablelifeofgearpump.Itisexpoundedthatthebasepressureshouldbeasuitablenumericalvaluein2steadofzero.KeywordsGearpumpImpulsetestBasepressureCHINESEHYDRAULICS&PNEUMATICS(Bimonthly)No111998(SerialNo195)IssueDate:Februray15,1998EDITORIALChineseHydraulics&PneumaticsEditorialOfficeAdd:1Jiaochangkou,DeshengmenWai,Beijing,ChinaPostcode:100011Tel:0086210262032255ext366,0086210262384244Fax:0086210262384244Telex:222825RIAMBCNPUBLISHEDBYBeijingResearchInstituteofAutomationforMachineBuildingIndustryFluidPowerTransmissionandControlInstitutionCMESCSBTS/NationalTechnicalCommitteeofFluidPowerforStandardizationPRINTEDBYBeijingRIAMBPrintinghouseOVERSEASDISTRIBUTORChinaInternationalBookTradingCorporation(P1O1Box399,Beijing,China)CODENO.BM8132