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外文翻译--化油器.doc

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外文翻译--化油器.doc

2012年5月25日英文原文1THECARBURETORCARBURETORISUNDERTHEEFFECTSOFTHEVACUUMENGINEWORKING,WILLBEAPERCENTAGEOFTHEFUELANDAIRMIXINGMECHANISMITTOIMPORTANTFUNCTIONTHATTHEENGINECANBECALLEDTHEHEARTOFTHEENGINETHECOMPLETEDEVICESHALLINCLUDESTARTINGDEVICE,IDLESPEEDDEVICE,MEDIUMLOAD,FULLLOADDEVICE,ACCELERATINGDEVICECARBURETORWILLACCORDINGTOTHEREQUIREMENTSOFDIFFERENTWORKINGSTATEOFTHEENGINE,AUTOMATICALLYMATCHINGTHECORRESPONDINGCONCENTRATION,OUTPUTTHECORRESPONDINGAMOUNTOFMIXTURE,INORDERTOMAKETHEMIXTUREMIXEDMOREEVENLY,CARBURETORHASMAKEFUELATOMIZATIONEFFECT,FORTHENORMALOPERATIONOFMACHINESIMPLECARBURETORISMADEUPOF3THREEPARTS,THEPARTWITHAIRINLETANDTHEFLOATCHAMBER,THEMIDDLESECTIONTHEREAREPIPES,ORIFICE,NOZZLE,HOWAPORTIONOFTHEVALVE,ETCFLOATCHAMBERISARECTANGULARCONTAINER,STOREOFGASOLINEFROMTHEGASOLINEPUMP,THEREISAFLOATCONTAINERUSINGSURFACEOILLEVELHEIGHTCONTROLSTHEINPUTINTHEMIDDLEOFANOILINLETANDTHEAMOUNTOFFLOATCHAMBERNOZZLEHOLE,THEOTHERENDOILOUTLETINTHROATTHROATITISTHROATWAIST,TWOBIGMIDDLESMALL,OFWHICHTHEMINIMUMCROSSSECTIONALAREAOFTHROATSUCTIONWHENTHEENGINEISSTARTEDTHEPISTONDOWNWARD,INHALATIONOFMAXIMUMSPEEDWHENTHEAIRFLOWTHROUGHTHETHROAT,STATICPRESSUREISTHELOWEST,SOTHETHROATPRESSURELESSTHANATMOSPHERICPRESSURE,THATISTOSAYTHROATTHROATANDPRODUCEDTHEPRESSUREDIFFERENCEBETWEENTHEFLOATCHAMBER,THATISTHEPEOPLEOFTENSAYVACUUM,THEGREATERTHEPRESSURERANGEOFVACUUMUNDERTHEACTIONOFGASINTHEVACUUMFROMTHEOILOUTLETNOZZLEJET,BECAUSEOFTHROATTHROAT25TIMESTHATOFGASFLOWRATEOFAIRFLOW,SOTHENOZZLEJETFLOWTHATISDISPERSEDBYHIGHSPEEDAIRFLOW,FORMINGFOGPARTICLESOFVARIOUSSIZES,NAMELYATOMIZATIONINITIALATOMIZINGOILMIXEDWITHAIRINTOAMIXTURE,THROUGHTHETHROTTLE,AIRINTAKEPIPEANDINLETVALVEINTOTHECOMBUSTIONCHAMBEROFCYLINDERHERE,THETHROTTLEOPENINGSIZEANDROTATIONALSPEEDOFENGINE,DETERMINEDTHETHROATSOFVACUUMDEGREE,ANDTHETHROTTLEOPENINGCHANGEDIRECTLYAFFECTSTHEMIXTURERATIOOFINGREDIENTS,THESEARETHEIMPORTANTREASONFORAFFECTINGTHEOPERATIONOFTHEENGINECHANGESDUETOTHECONCENTRATIONOFTHEMIXTUREWITHENGINEUNDERVARIOUSOPERATINGCONDITIONSOFLOADCHANGEISCLOSELYRELATED,SIMPLECARBURETORFARCANNOTSATISFYTHECHANGEREQUESTATANYTIME,SOPEOPLEONTHESIMPLECARBURETORCONSTANTLYADDNEWDEVICEUSEDFORADJUSTINGTHEWORKINGSTATEOFTHECARBURETORDEVELOPMENTTODAY,HASFORMEDTHECARBURETORHASAVARIETYOFAUXILIARYEQUIPMENT,MAINLYAREIDLE,TANGY,ACCELERATIONANDINITIATINGDEVICENOW4CYLINDERENGINECOMMONDYNAMICCARBURETORCARBURETORISDOUBLECAVITY,ITHASTWOPIPES,ANDACCORDINGTOTHEDIFFERENTENGINEOPERATINGCONDITIONSORWORKATTHESAMETIME,RESPECTIVELY6CYLINDERENGINECOMMONCARBURETORISDOUBLECAVITYANDCARBURETOR,ITISACTUALLYTWOSINGLECAVITYCARBURETORANDTOGETHER,EACHCAVITYISRESPONSIBLEFORHALFOFTHENUMBEROFMIXTUREGASCYLINDERANDMULTICAVITYCARBURETOR,USUALLYASSEMBLEDONLARGEPOWERENGINECARBURETOROFTHEMULTIPLEFUNCTIONSOFDEVICE,THEMAINOILSUPPLYUNITISINADDITIONTOTHEIDLESPEED,ENGINEWORKINGCONDITIONOFVARIOUSOTHERNEEDSOFOILSUPPLYDEVICE,ISTHEBASICFUELSUPPLYCARBURETORSTRUCTURETHEIDLEDEVICEISINIDLESPEEDRUNTIMEPROVIDESFEWBUTSTRONGMIXTUREDEVICE,WITHTHELOWESTSTABLEENGINESPEEDADDDEVICEISBIGENGINELOADEXTRAOILSUPPLYDEVICE,INORDERTOMAKEUPFORTHEINADEQUACYOFTHEMAINOILSUPPLYACCELERATINGDEVICEISINCREASEDWHENTHECARSUDDENLYACCELERATEDTIMEOFVALVEOPENINGEXTRAOILSUPPLYDEVICE,WHENTHEENGINESPEEDANDPOWERCANBEINCREASEDRAPIDLYSTARTERISTOPROVIDEEXTREMELYRICHMIXTUREWHENTHEENGINECOLDSTARTDEVICE,THECOMMONWAYISINTHEFRONTHOSETOACHOKEVALVETOCONTROLTHEVOLUMETHESPEEDOFPARTICULARMENTIONHEREWORKINGCONDITIONOFENGINEIDLESPEEDISTHEMOSTCOMMONLYUSEDFORENGINETHERMALPROCESSANDNOPARKINGSTALLANDSOONFORTHECARPERFORMANCEHASVERYIMPORTANTSIGNIFICANCE,ESPECIALLYINCITYDRIVING,IDLESPEEDCONDITIONOFTENDETERMINETHECARSFUELCONSUMPTIONANDEMISSIONLEVELENGINEIDLESPEEDRUNNINGSPEEDISTYPICALLY600800RPM,THROTTLECLOSETOSHUTDOWN,THESPEEDOFPIPES,VACUUMDEGREECANTFLOATCHAMBERGASOLINEITSUCKEDOUTSMOOTHLY,BUTTHETHROTTLEATTHEBACKOFTHEVACUUMDEGREEISHIGHSOJUSTONTHEBASISOFSIMPLECARBURETOROFSETTINGUPAIDLEOILDUCT,THENOZZLEISLOCATEDINTHETHROTTLE,THEPROBLEMISSOLVEDDUETOIDLENEEDLESSTHICKMIXTURE,THEENGINEOPERATIONCONDITIONISMORESENSITIVE,STABLEANDSHOULDBETHEMINIMUMSPEEDOFTHEIDLESTATE,TOCONTROLTHEOILAMOUNTOFTHEADJUSTMENTANDTHEOPENINGOFTHROTTLENOWTHECARBURETOROFIDLESPEEDDEVICEHASTWOADJUSTINGSCREW,ADJUSTTHEOILANDTHETHROTTLEOPENINGRESPECTIVELYATTHESAMETIME,INORDERTOPREVENTTHEPHENOMENONOFCLOSEAUTOIGNITIONSWITCHANDTHEENGINEISSTILLRUNNING,THEOILINTHECARBURETORIDLEWAYWILLALSOINCLUDEAIDLESPEEDSOLENOIDVALVE,SPECIFICALLYRESPONSIBLEFOROPENINGANDCLOSINGTHEIDLEOILDUCT,GUARANTEEENGINECANQUICKLYSHUTDOWN2THEWORKINGPRINCIPLEOFTHECARBURETORCARBURETORISACTUALLYAPIPE,TUBEMIDDLETHEREISACALLEDTHETHROTTLEADJUSTABLEPLATEDOORPLANK,ISUSEDTOCONTROLTHEFLOWOFAIRTHROUGHTHETUBETUBEHASASECTIONCALLEDVENTURICONTRACTION,THESHRINKAGEWILLFORMAVACUUMTHECONTRACTIONSECTIONORIFICE,THEUSEOFVACUUMCANBEHOLEINHALEFUELFROMNOWONMOTORCYCLECARBURETORLOOKSVERYCOMPLEX,BUTASLONGASGRASPSOMEPRINCIPLE,CANADJUSTTHEMOTORCYCLETOTHEBESTSTATEALLCARBURETORSAREWORKINGUNDERTHEBASICPRINCIPLEOFATMOSPHERICPRESSUREATMOSPHERICPRESSUREISAPOWERTOPUTPRESSUREONEVERYTHINGITWILLHAVESLIGHTVARIATIONS,BUTUSUALLYFIFTEENPOUNDSOFPRESSUREPERSQUAREINCHPSITHISMEANSTHATTHEATMOSPHERICPRESSUREINANYTHINGISFIFTEENPOUNDSPERSQUAREINCHPRESSUREBYCHANGINGATMOSPHERICPRESSUREWITHINTHEENGINEANDCARBURETOR,YOUCANCHANGETHEPRESSUREANDMAKETHEFUELANDAIRFLOWTHROUGHTHECARBURETORTHEATMOSPHERICPRESSUREWILLSPREADFROMHIGHPRESSURETOLOWPRESSUREWHENTWOSTROKEENGINEPISTONATTOPDEADCENTERORFOURSTROKEENGINESPISTONATTHECHECKPOINT,UNDERINTHECRANKCASEPISTONFOURSTROKEENGINEPISTONABOVEWILLFORMALOWPRESSUREATTHESAMETIME,THELOWPRESSURECANALSOCAUSELOWPRESSUREINTHECARBURETORBECAUSEOFTHEHIGHPRESSURECOMPAREDTOTHEOUTSIDEOFTHEENGINEANDCARBURETOR,WILLBURSTINTOTHECARBURETORANDAIRINTOTHEENGINEUNTILTHEPRESSUREISBALANCEDAIRFLOWINGTHROUGHTHECARBURETORWILLDRIVETHEFUEL,ANDFUELWILLBEMIXEDWITHAIRINSIDETHECARBURETORISATHROATTHROATISINSIDETHECARBURETORFORCEDAIRSPEEDTHROUGHTHECONTRACTIONSECTIONCANALLOFASUDDENNARROWINGRIVERTOILLUSTRATETHESITUATIONOFOCCURREDINTHECARBURETORNARROWTHERIVERNEARTHEBANKSOFTHERIVERWILLSPEEDUP,IFBANKSCONTINUOUSNARROWWILLBEFASTERIFTHESAMETHINGHAPPENINTHECARBURETOR,ACCELERATETHEFLOWOFAIRWILLLEADTOTHEINSIDEOFTHECARBURETORAIRPRESSUREISREDUCEDGASOLINEISTHEFUELTANKTHROUGHTHEFUELFILTERAGAININTOTHECARBURETOR,FUELFILTERTHEIMPURITIESCANBEMIXEDWITHGASOLINEANDTHESCALEFILTERINSIDETHETANKIFTHEFILTERQUALITYDEFECTIVE,THEREARESTILLSOMEIMPURITIESTHROUGHTHEFILTERINTOTHECARBURETOROTHERGASOLINECONTAINEDCANFORMGELINGREDIENTSAFTERLONGTIMEDEPOSITWILLCONDENSEOUTOFTHECOLLOID,ATTACHEDTOTHECARBURETORPARTSSUCHASORIFICE,OILANDFLOATONTHESURFACEAIRISTHROUGHAIRFILTERINTOTHECARBURETOR,BASEDONTHEAIRINTAKERESISTANCECANNOTBETOOBIGANDOTHERFACTORSTOCONSIDER,FILTERINGDEVICECANNOTTOOTIGHT,SOPARTOFTHETINYIMPURITIESINTHEAIRWILLENTERTHECARBURETORTHROUGHAIRFILTERIFTHEFILTERQUALITYDEFECTIVE,CANCAUSEMORESERIOUSINFLUENCECOMPOSITIONINTHEAIRWAYSOFTHECARBURETOROILDUCT,MORESPAREPARTS,SUCHASTHEMAINMEASUREHOLES,IDLEHOLEORIFICE,PRIMARYAIR,IDLEAIRHOLE,THEFOAMPIPE,ANDSOONALLHAVEINSIDEASMALLHOLEDIAMETERBETWEEN0315MM,INTOTHECARBURETORPETROLIMPURITY,COLLOIDANDIMPURITIESINTHEAIR,TENDTOTHEAPERTURECHANGEORJAMS,CAUSECARBURETORAIRWAY,POOROILDUCT,MAKETHECARBURETORFUELSUPPLYCHARACTERISTICSCHANGE,EVENCAUSETHECARBURETORPERFORMANCEFAILURE3THEPNEUMATICSYSTEMPNEUMATICTECHNOLOGYISONEOFTHEWAYSINWHICHINDUSTRIALPRODUCTIONMECHANIZATIONANDAUTOMATIONPNEUMATICSYSTEMTHEUSEOFSAFE,RELIABLE,CANBEINHIGHTEMPERATURE,VIBRATION,CORROSION,INFLAMMABLE,EXPLOSIVE,MOREDUST,STRONGMAGNETIC,RADIATION,ETCWORKUNDERTHEBADENVIRONMENT,WHICHAPPLICATIONISINCREASINGLYWIDEPNEUMATICSYSTEMANDHYDRAULICSYSTEM,AREMADEBYONEORMOREOFTHEMOSTSIMPLEOFBASICCIRCUITSPNEUMATICCIRCUITANDCOMMONBASICCIRCUITISINORDERTOACHIEVETHESPECIFICFUNCTIONSANDPNEUMATICCOMPONENTSANDPIPESINACERTAINWAYOFCOMBINEDSTRUCTURE,ANALYSIS,DESIGNANDUSEOFTHEPNEUMATICSYSTEMISPNEUMATICTRANSMISSIONANDCONTROLISONEOFTHEMOSTEFFECTIVEWAYINTHEPRODUCTIONPROCESSAUTOMATIONANDMECHANIZATION,BUTITSWORKINGMEDIUMCOMPRESSEDAIRMANUFACTURINGCOSTISHIGH,THEENERGYUTILIZATIONRATEISQUITELOWPNEUMATICACTUATORSISMAINLYUSEDTOMAKELINEARRECIPROCATINGMOTIONENGINEERINGPRACTICE,THISKINDOFMOVEMENTFORMUSEDMOST,SUCHASMANYMACHINESORDEVICESTRANSMITTINGDEVICE,PRODUCTPROCESSINGWORKPIECEFEEDING,POSITIONINGANDCLAMPINGWORKPIECE,WORKPIECEASSEMBLYANDMATERIALFORMINGARELINEARMOTIONFORMBUTSOMEPNEUMATICACTUATORSCANMAKEROTATIONMOVEMENT,SUCHASTHEOSCILLATINGCYLINDERSWINGANGLEIS360PNEUMATICTECHNOLOGYAPPLICATIONRANGE,INADDITIONTOTHEINDIVIDUALCIRCUMSTANCES,TODOLINEARMOTIONFORM,FROMTHETECHNOLOGYFROMACOSTPOINTOFVIEW,ALLMECHANICALSHEBICANNOTCOMPAREDWITHPNEUMATICEQUIPMENTFROMTHETECHNICALANDCOSTPOINTOFVIEW,CYLINDERASACTUATORISTHEBESTFORMOFCOMPLETELINEARMOTION,LIKEMOTORTOCOMPLETEROTATIONMOVEMENTPNEUMATICTECHNOLOGY,THEINTERACTIONBETWEENACTUATORSANDCONTROLELEMENTISBASEDONTHESIMPLEELEMENTMISSIONREQUIREMENTS,THESECOMPONENTSCANBEASSEMBLEDINTOAVARIETYOFSYSTEMSOLUTIONSPNEUMATICCONTROLAGENCIESOREQUIPMENTGREATLYIMPROVETHEMECHANIZATIONDEGREE,ANDCANREALIZEFULLYAUTOMATED,PNEUMATICTECHNOLOGYHASMADEASIGNIFICANTCONTRIBUTIONTOTHECHEAPAUTOMATIONINFACT,ASINGLEPNEUMATICCOMPONENTS,SUCHASVARIOUSTYPESOFCYLINDERANDCONTROLVALVECANBEASMODULARCOMPONENTS,THISISPNEUMATICCOMPONENTSMUSTBECOMBINED,TOFORMACONTROLLOOPUSEDTOCOMPLETEASPECIFICASSIGNMENTSBROADLYSPEAKING,PNEUMATICEQUIPMENTCANBEAPPLIEDTOANYENGINEERINGFIELDPNEUMATICEQUIPMENTISOFTENBYASMALLAMOUNTOFPNEUMATICCOMPONENTSANDSEVERALBASICLOOPCOMBINATIONPNEUMATICCONTROLSYSTEMCOMPOSITIONISREPRODUCIBLE,ITLAIDTHEFOUNDATIONFORCOMBINATIONANDPNEUMATICCOMPONENTSANDAPPLICATIONSINGENERAL,THECOMBINATIONOFPNEUMATICCOMPONENTSWITHMANYRESERVATIONSWITHINFUNCTIONSBATCHFEEDERISALSOOFTENUSEDASACOMPONENTTOPROVIDETHEWHOLEMACHINETHUSGREATLYSIMPLIFYTHEPNEUMATICSYSTEMDESIGN,REDUCETHEWORKLOADOFDESIGNANDINSTALLATIONDEBUGGINGPERSONNEL,MAKETHEPNEUMATICSYSTEMCOSTISREDUCEDGREATLYPNEUMATICSYSTEMBASICCOMPOSITIONCOMPOSITIONOFTHEPNEUMATICCIRCUITTODRIVEMECHANISMFORVARIOUSPURPOSES,ITSCONTENTISTHETHREEMOSTIMPORTANTCONTROLFORCE,THESIZEOFTHEFORCEDIRECTIONANDSPEEDOFMOVEMENTCONNECTEDTOPRODUCTIONDEVICESOFVARIOUSTYPESOFCYLINDER,BYPRESSURECONTROLVALVES,DIRECTIONALCONTROLVALVESANDFLOWCONTROLVALVE,THECONTE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