液压与气压传动英汉双语 教学课件 作者 陈淑梅第6章Chapter_6.ppt

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1、Chapter6AuxiliaryComponentsforHydraulicSystems6.1Accumulators6.2Filters6.3Reservoir6.4Piping/TubingandConnectors6.5SealsandSealingDevices6.1Accumulators6.1.1OperatingprinciplesofaccumulatorTherearethreetypesofaccumulators:springloaded,weightloadedandchargedgas.Thecommonusedischargedgas.Gasandoi

2、lfluidcanbedividedintopistontype(Fig.6-1a),bagtypeorflexibletype(Fig.6-1b).Fig.6-2showsanaccumulator,whichbasicallyconsistsof4parts:shellbody1,interlayer3,airloaded2(weightloadedorspringloaded)ontheupperoftheinterlayerandoperatingoil4locatedundertheinterlayerandconnectedwithsystem.Itincludestwo

3、processes:filledinoilfluid(accumulation)anddisplacementoutoilfluid(release).Fig.6-1ChargedgasaccumulatorPistontypeBagtypeFig.6-2Operatingprincipleofaccumulator1-Shell(壳体)2-Compressiblegas(orweightorspring)可压缩气体（重物或弹簧)3-Interlayer(隔层)4-Operatingfluid(工作液体)1.Filledinoilfluid(accumulation)Whenoper

4、atingoilpressureintheaccumulatorisincreasedwiththeoilpressureinhydraulicsystemtheinterlayerlossesequilibriumandmoveduptheundertheactionofoperatingdifference.Itincludestwoprocesses:filledinoilfluid(accumulation)anddisplacementoutoilfluid(release).asshowninFig.6-2b.2.Displacementoutoilfluid(relea

5、se)Whenthesystempressureislowerthanthepressureoftheoperatingoil,theinterlayismoveddownundertheactionofgaspressure(orweightloadedorspringloaded);atthesametimeoilisdischargedoutoftheaccumulatorandflowintothesystemuntilanewpressureequilibriumonthetwosidesoftheinterlayerasshowninFig.6-2b.6.1.2Appli

6、cationsSuchanaccumulatorcanbeusedtoadvantageinanumberofhydraulicapplications:1.Tosupplyoillostthroughleakageinasystemheldunderpressurebutnotoperatingforlongperiods.Toserveasanauxiliaryoremergencysourceofhydraulicpowerwherepumporfeedlinehavefailed.Tooperateasecondarycircuitintermittentlyinconnec

7、tionwithaconstantdutyprimarycircuitwithoutaffectingthespeedorloadingoftheprimarycircuit.Tocompensateforexpandingandcontractingvolumesduetothermalchanges.2.Tosupplyholdingpressurewheretheoperatingcyclecallsforpressuretobeappliedfor