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1、本科生毕业设计(论文)外文翻译原文标题Oilpressurepumpcover译文标题油压泵简介作者所在系别机械工程系作者所在专业机械设计制造及其自动化完成时间2014年5月20-9-译文标题油压泵原文标题Oilpressurepumpcover作者译名国籍原文出处http://www.freepatentsonline.com原文Ahydraulicpumpisamechanicaldevicewhichconvertsmechanicalenergyintohydraulicenergy.More
2、specifically,apumpconvertsthekinetic(moving)energyofarotatingshaftintothekineticenergyoffluidflow.Thefluidflowalsohaspotentialenergythatallowsittoovercometheresistanceofthesystemtofluidflow.Rememberthatapumpprovidestheforceproduceflowandtransmitpower.Hy
3、draulicpressureiscausedbytheloadonthesystemandbytheresistanceofthehydraulicsystemtofluidflow.Whenoperating,ahydraulicpumpperformstwofunctions.First,itcreatesapartialvacuumatitsinlet,permittingtheatmosphericpressureinthefluidreservoirtopushthehydraulicfl
4、uidthroughtheinletstrainerandlineintothepump.Second,itsmechanicalactiondeliversthefluidtoitsoutletandintothehydraulicsystems,asshowninFig.5-1.Asthefluidleavesthepump,itencounterstheworkingpressureinthesystem.Thispressureisproducedbythepressureregulating
5、valve,thesystemworkload,andflowlossesinthehydraulictubingApumpisclassifiedonthebasisofthephysicalarrangementofitspumpingmechanismanditsbasicprincipleofoperating.Pumpsclassifiedbyprincipleofoperationincludepositivedisplacementandnonpositive-displacementt
6、ypes.Positive-displacementpumpsareequippedwithamechanicalseparation(gears,vanes,orimpellers)betweentheinletandoutlet,whichminimizesinternalleakageorslippage.Therefore,theoutputofpositive-displacementpumpsisalmostunaffectedbyvariationsinsystempressureNop
7、ositive-displacementpumps(suchascentrifugalpumps)donothaveapositiveinternalseparationagainstleakageorslippage.Becauseofthisslippage,thedeliveryofthesepumpisreducedastheworkingpressureofa-9-systemisincreased.However,nonpositive-displacementpumpsdeliverac
8、ontinuousflow,whilepositive-displacementpumpsdeliveranintermittent(pulsating)flow.Thesepulsationsaresmallandcanbesmoothoutbytheaccumulatororthesystempiping.Mosthydraulicpumpsarepositive-displacementpumpsoftherotarytype.Positive-d
