毕业论文外文翻译小型制冷压缩机研究.docx

毕业论文外文翻译小型制冷压缩机研究.docx

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毕业论文外文翻译小型制冷压缩机研究

SmallCOMPRESSOR

Compressorrefrigerationsystemisthecoreandheartofitsdecisiontotherefrigerationsystemcapabilitiesandfeatures.Thispapernotonlyenergyefficient,noiseandvibrationandrefrigerationagentanalyzedsmallrefrigerationcompressortechnicalperformance,Analysisalsohaveappearedinrecentyears,thenew,specialsmallcompressormainfeatureforussmallrefrigerationcompressorfuturedevelopmenttrendoflayingatechnologicalfoundation.

Asweallknow,thecompressorrefrigerationsystemisthecoreandheart.Compressoranddecidedthatthecoolingsystemcapacityandfeatures.Inasense,thecoolingsystemdesignandmatchingofthecompressoristheabilitydemonstrated.Therefore,countriesintheworldareallintherefrigerationindustryrefrigerationcompressorresearchinvestedatremendousamountofenergy,newresearchdirection,andresearchresultscontinuetoemerge.Compressortechnologyandperformancelevelwitheachpassingday.

1.AcompressorEfficiencyStudy

Compressorrefrigerationsystemisthecoreenergycomponents,improvetheefficiencyofrefrigerationsystemsofthemostdirectandeffectivemeansistoincreasetheefficiencyofthecompressor,Itwillbringtheenergyconsumptiondecreasedsignificantly.Moreover,canonlyavoidthesystemtakemeasures（suchassimplyincreasingheatexchangerarea,etc.）causedbytheconsumptionofmaterialsincreased.Inrecentyears,asworldenergyshortagesituationworsensdaybyday,moreandmoreattentiontovariousenergy-savingworktheenergyefficiencyofproductsmadebytheever-increasingdemands.Duetolossessuchasfriction,leakage,harmfulheat,theelectricalloss,flowresistance,noisevibrationofexistence,Compressorworkfarbelowtheactualefficiencyoftheoreticalefficiency.Therefore,fromatheoreticalpointofview,anyreductioninalossofarbitrarymeasurestoimprovetheefficiencyofthecompressor.Theobjectivefactshaveledtotheenergysavingcompressorscope,direction,width,researchtopicsandresultsvaried.

Onthecurrentinternationalenergy-efficientcompressorsresearchconcentratedmainlyinafewareas:

researchlubricationpropertiesCompressorpartsofthefrictionbearingstoreducefrictioncharacteristicsofpower,improvetheefficiencyofthecompressor;reduceleakagelossestoimprovetheefficiencyofthecompressor;usingfrequencymodulationtechnologyorrefrigerationsystemthroughtheeffortwiththeuserloadtomatchthebestenergysavingInthisregardtheparticularfrequencytechnologyhasbeenrelativelymaturewellknownandnotrepeatthemhere.ValveResearchisanoldtopicbutitisalsoaneternaltopic,ImprovementofthevalvedesignedtoimprovetheefficiencyofthecompressoralsoNagamochiendlessharvest.Researchinthisareamanytimes,fromthevalvematerial,sportslaw,optimizingthestructureoftheapplicabletheory,exhaustivetestingmethods.Inshort,energy-savingcompressorsontheresearchinrecentyearshasbecomeoneoftherefrigerationindustryfirsthotissues.

Inrecentyears,domesticrefrigerationcompressorindustrytostudyenergy-savingproductsarealsogivinggreatconcern.Progresslargerproductsmainlyrefrigeratorcompressorindustry.InChinaefficientrefrigeratorsGEFprojectstopromoteandsupport,boththeenterprisesforenergy-efficientproductsistheunderstandingoftheperformanceofrefrigeratorcompressorshaveaqualitativeleap.Atpresent,domesticenterprisesrefrigeratorcompressorproductsofthehighestenergyefficiencyhasreached1.95%.Refrigeratorcompressordomesticenterprisestotakealotoftechnicalmeasuressuchashighefficiencymotorsorsynchronousmotor,concavevalves,Planethrustbearing,lowviscositylubricants,thenewGettermuffler,reducingfrictionlosses,andachievedgreatresults.Themainproblemisthelackofdomesticenterprisescurrentlyfreetechnology,thetechnologyhastoimitatethelinemainly,Mostoftheenterprisestobuildtheirowntechnologyinfrastructurealsounconscious,northeinterest,andthisrestrictsthedevelopmentoftechnologicalcapacity.

Relativetotherefrigeratorcompressorindustry,domesticenergy-efficientair-conditioningcompressorstudyitwasnotperturbed,Overtheyearstheefficiencyofthecompressorisnosubstantivechange,greatermarketdemandmakesmostoftheair-conditioningcompressorenterpriseswillconcentrateonexpandingproductionon.WiththenationontheairconditionerenergyefficiencystandardssetforthefurtherimprovementofChina'sairconditionerexportsvariousperilsofshowing,domesticair-conditioningcompressorofthisshort-sightedenterpriseswillbeunabletoadapttotheenergy-savingdevelopmentofthesituation.Enterprisealsoonthefollow-upisweak.

2.Compressornoiseandvibrationstudy

Currently,thenoisehasbeenregardedasoneoftheseriouspollution.Householdrefrigerationequipmentasthesourceofpowerandheart,refrigerationcompressornoise,tobeameasureofitsperformanceasanimportantindicator.Infact,toacompressorspeaking,Mostofthenoiseisduetoshellbysomenoisefromthesourceexcitation（suchassprings,refrigerantpressurepulsation,exhaustpipe,lubricantsetc.excited）.Butcompressornoisesourcesandpathwayscomplexanddiverse,whichgivesthecompressornoisesilencerbroughtgreatdifficulties.

Onthecompressornoise,vibrationandforeignscholarshaveconductedalargenumberoflong-termresearch.Hereinthisregardtothemainresearchresultsaresummarizedbelow:

ThemainrefrigerationcompressornoiseExaggerativeinlet,exhaustradiationaerodynamicnoise,mechanicalmovingpartsofmachinerynoiseandnoise-drivenmotorthreecomponents:

2.1Aerodynamicnoise

Compressorinletairflownoiseisduetotheintakemanifoldpressurepulsationintheelections.Inlet-frequencynoiseandtheintakemanifoldgasLanesamefrequencypulsatingwiththespeedofthecompressor.Compressorexhaustnoiseisduetoairintheexhaustpipecausedbyfluctuatingpressures.Exhaustnoisethantheinletnoiseweak,sothecompressoraerodynamicnoisegenerallyInletmainlynoise

2.2MechanicalNoise

Compressormechanicalnoise,includingmembersofthegeneralimpactandfriction,thepistonvibration,noiseimpactofthevalve,Thesenoisewithrandomness,wasFFT.Computed.

2.3Electromagneticnoise

Compressorelectromagneticnoiseisgeneratedbythemotor.Motornoiseandaerodynamicnoiseandmechanicalnoiseisweakercompared.Noisesourcecompressorinlet,exhaust,aerodynamicnoise,thestrongest,followedbymechanicalnoiseandelectromagneticnoise.Throughin-depthstudies,wecanfurtherthatthemaincompressornoisefromthevibration（fromtheDepartmentofspring,Refrigerationmediumpressurepulsationandsmokeexhaustpipeandlubricantshaveincentive）totheambientmediumspreadformationnoise.Ontheefforttoreducecompressornoise,muchoftheliterature（abbreviated）proposedaseriesofmeasuresandtheNoiseandVibrationReductionprogram:

①increaserigidshellstructuretoimprovetheoverallresonancefrequencyreducesvibrationamplitude;

②curvatureoftheshelltoavoidmutation,thesurface,andthenaturalfrequencyisinverselyproportionaltotheradiusofcurvature.shellshapeitshouldbethesmallestcurvatureradius;

③springbearingflagswillbemovedtohigherrigidposition;

④shellshouldbeusedaslittleaspossibleoftheplane;bendingstressandthestresscouplingmembrane（justonthesurface）willshellitselfisfairlyrigid.Thereforecompressorshelltobeusedaslittleaspossibleplanarstructure;

⑤avoidtheexhaustpipeandcondenserincentive,optimizingexhaustflowpulsation,Exhaustpipeusedintheintroductionofadditionalvolumetotheeliminationofpressurefluctuationspectrumofhigh-orderharmonics;

⑥non-symmetricshellshape;Symmetricalthree-dimensionalstructuremeansthattheaxis,alongthemainaxisbiggeststressofleastresistance.Thereforeitisasymmetricalshellstructuremeansthatthecompressorcanbegreatlyreducedalongtheaxisdirectionofaforcewhiletheprobability;

⑦setinlet,exhaustmuffler,theclosedCompressorMufflergenerallymuffler.ItusesCrossSection,resonantcavitycausedacousticimpedancechangesinreflectivityorsoundenergyconsumption.oruseacoustic-acousticsendphasedifferenceof180degreestooffsetthemufflerofnoise.ShellcompressorinthelateralclosedUnicomaHelmholtzresonator,namely:

Helmholtzresonatorfromthechamberthroughtheneckholeandshellcompressorconnectedintotheinternalcavity,toreducecompressorcavitystimulatedacousticmodalamplitude.Theresultsshowed:

resonatorresonancefrequencymodulationoftheactualcompressorcavitystimulatedthegreatestvibrationmodes,willbesubstantiallyreducedresonancepeakresponsespectrumandleadtosignificantchange.However,itwillaffecttheappearanceandthecompressorrefrigeratorsettings,theresearchresultsarenotyetappliedtoproducts.

Lubricantsandresidualvolume-coilmotorwindingswillleadtothesametypesofbulkcompressorlevelsbetweendifferent（fromlevelsaverage）.Bychangingtheshellexternalsupporttoincreasetorsionalstiffnessandreducevibrationsurface;Noisestudythecomplexrequirementsofresearchershasstrongtheory,theenterprisehasgoodskillsbaseandtheneedforgreaterinvestmentandalongertimeframe.Thisisdomesticenterprisescompressoroneoftheweaklinks,whichisnowbasicallyinthequalitativephaseofexperimentalresearch,Alongwithagreatchanceandrandomness.

3.newrefrigerantsApplication

Basedonthenewenvironmentalrequirementsofrefriger