完整版小型制冷压缩机研究外文翻译1毕业设计论文.docx
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完整版小型制冷压缩机研究外文翻译1毕业设计论文.docx
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完整版小型制冷压缩机研究外文翻译1毕业设计论文
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未经允许切勿外传
SmallCOMPRESSOR
Compressorrefrigerationsystemisthecoreandtotherefrigerationsystemcapabilitiesandfeatures.Thispapernotonlyenergyefficient,noiseandvibrationandrefrigerationagentanalyzedsmallrefrigerationcompressortechnicalperformance,Analysisalsorecentyears,thenew,specialsmallcompressormainfeatureforussmallrefrigerationcompressorfuturedevelopmenttrendoflayingatechnologicalfoundation.
Asweallknow,thecompressorrefrigerationsystemisthecoreandasense,thecoolingsystemdesignandmatchingofthecompressoristheabilitydemonstrated.Therefore,countriesintheworldareallintherefrigerationindustryrefrigerationcompressorresearchinvestedatremendousamountofenergy,newresearchdirection,andresearchresultscontinuetoemerge.Compressortechnologyandperformancelevelwitheachpassingday.
1.AcompressorEfficiencyStudy
Compressorrefrigerationsystemisthecoreenergycomponents,improvetheefficiencyofrefrigerationsystemsofthemostdirectandeffectivemeansistoincreasetheefficiencyofthecompressor,Itwillbringtheenergyconsumptiondecreasedsignificantly.Moreover,canonlyavoidthesystemtakemeasures(suchassimplyincreasingofmaterialsincreased.Inrecentyears,asworldenergyshortagesituationworsensdaybyday,moreandmoreattentiontovariousenergy-savingworktheenergyefficiencyofproductsmadebytheever-increasingdemands.Duetolossessuchasfriction,leakage,ofexistence,Compressorworkfarbelowtheactualefficiencyoftheoreticalefficiency.Therefore,fromatheoreticalpointofview,anyreductioninalossofarbitrarymeasurestoimprovetheefficiencyofthecompressor.Theobjectivefacts,width,researchtopicsandresultsvaried.
Onthecurrentinternationalenergy-efficientcompressorsresearchconcentratedmainlyinafewareas:
researchlubricationpropertiesCompressorpartsofthefrictionbearingstoreducefrictioncharacteristicsofpower,improvetheefficiencyofthecompressor;reduceleakagelossestoimprovetheefficiencyofthecompressor;usingfrequencymodulationtechnologyorrefrigerationsystemthroughtheeffortwiththeuserloadtomatchthebestenergysavingInthisregardtheparticularfrequencytechnologyrelativelymaturewellknownandnotrepeatthemoldtopicbutitisalsoaneternaltopic,ImprovementofthevalvedesignedtoimprovetheefficiencyofthecompressoralsoNagamochiendlessthisareamanytimes,fromthevalvematerial,sportslaw,optimizingthestructureoftheapplicabletheory,exhaustivetestingmethods.Inshort,energy-savingcompressorsontheresearchinrecentyearsindustryfirstrecentyears,domesticrefrigerationcompressorindustrytostudyenergy-savingproductsarealsogivinggreatconcern.Progresslargerproductsmainlyrefrigeratorcompressorindustry.InChinaefficientrefrigeratorsGEFprojectstopromoteandsupport,boththeenterprisesforenergy-efficientproductsistheunderstandingoftheperformanceofrefrigeratorcompressorslosses,andachievedgreatresults.Themainproblemisthelackofdomesticenterprisescurrentlyfreetechnology,thetechnologytechnologyinfrastructurealsounconscious,northeinterest,andthisrestrictsthedevelopmentoftechnologicalcapacity.
Relativetotherefrigeratorcompressorindustry,domesticenergy-efficientair-conditioningcompressorstudyitwasnotperturbed,Overtheyearstheefficiencyofthecompressorisnosubstantivechange,greatermarketdemandmakesmostoftheair-conditioningcompressorenterpriseswillconcentrateonexpandingproductionon.WiththenationontheairconditionerenergyefficiencystandardssetforthefurtherimprovementofChina'sairconditionerexportsvariousperilsofshowing,domesticair-conditioningcompressorofthisshort-sightedenterpriseswillbeunabletoadapttotheenergy-savingdevelopmentofthesituation.Enterprisealsoonthefollow-upisweak.
2.Compressornoiseandvibrationstudy
Currently,thenoiseregardedasoneoftheseriouspollution.Householdrefrigerationequipmentasthesourceofpowerandcompressornoise,tobeameasureofitsperformanceasanimportantindicator.Infact,toacompressorspeaking,Mostofthenoiseisduetoshellbysomenoisefromthesourceexcitation(suchassprings,refrigerantpressurepulsation,exhaustpipe,lubricantsetc.excited).Butcompressornoisesourcesandpathwayscomplexanddiverse,whichgivesthecompressornoisesilencerbroughtgreatdifficulties.
Onthecompressornoise,vibrationandforeignscholarsthisregardtothemainresearchresultsaresummarizedbelow:
ThemainrefrigerationcompressornoiseExaggerativeinlet,exhaustradiationaerodynamicnoise,mechanicalmovingpartsofmachinerynoiseandnoise-drivenmotorthreecomponents:
2.1Aerodynamicnoise
Compressorinletairflownoiseisduetotheintakemanifoldpressurepulsationintheelections.Inlet-frequencynoiseandtheintakemanifoldgasLanesamefrequencypulsatingwiththespeedofthecompressor.Compressorexhaustnoiseisduetoairintheexhaustpipecausedbyfluctuatingpressures.Exhaustnoisethantheinletnoiseweak,sothecompressoraerodynamicnoisegenerallyInletmainlynoise
2.2MechanicalNoise
Compressormechanicalnoise,includingmembersofthegeneralimpactandfriction,thepistonvibration,noiseimpactofthevalve,Thesenoisewithrandomness,wasFFTputed.
2.3Electromagneticnoise
Compressorelectromagneticnoiseisgeneratedbythemotor.Motornoiseandaerodynamicnoiseandmechanicalnoiseisweakercompared.Noisesourcecompressorinlet,exhaust,aerodynamicnoise,thestrongest,followedbymechanicalnoiseandelectromagneticnoise.Throughin-depthstudies,wecanfurtherthatthemaincompressornoisefromthevibration(fromtheDepartmentofspring,Refrigerationmediumpressurepulsationandsmokeexhaustpipeandlubricantsnoise.Ontheefforttoreducecompressornoise,muchoftheliterature(abbreviated)proposedaseriesofmeasuresandtheNoiseandVibrationReductionprogram:
①increaserigidshellstructuretoimprovetheoverallresonancefrequencyreducesvibrationamplitude;
②curvatureoftheshelltoavoidmutation,thesurface,andthenaturalfrequencyisinverselyproportionaltotheradiusofcurvature.shellshapeitshouldbethesmallestcurvatureradius;
③springbearingflagswillbemovedto;
④shellshouldbeusedaslittleaspossibleoftheplane;bendingstressandthestresscouplingmembrane(justonthesurface)willshellitselfisfairlyrigid.Thereforecompressorshelltobeusedaslittleaspossibleplanarstructure;
⑤avoidtheexhaustpipeandcondenserincentive,optimizingexhaustflowpulsation,Exhaustpipeusedintheintroductionofadditionalvolumetotheeliminationofpressurefluctuationspectrumof-symmetricshellshape;Symmetricalthree-dimensionalstructuremeansthattheaxis,alongthemainaxisbiggeststressofleastresistance.Thereforeitisasymmetricalshellstructuremeansthatthecompressorcanbegreatlyreducedalongtheaxisdirectionofaforcewhiletheprobability;
⑦setinlet,exhaustmuffler,theclosedCompressorMufflergenerallymuffler.ItusesCrossSection,resonantcavitycausedacousticimpedancechangesinreflectivityorsoundenergyconsumption.oruseacoustic-acousticsendphasedifferenceof180degreestooffsetthemufflerofnoise.ShellcompressorinthelateralclosedUnicomaHelmholtzresonator,namely:
Helmholtzresonatorfromthechamberthroughtheneckoftheactualcompressorcavitystimulatedthegreatestvibrationmodes,willbesubstantiallyreducedresonancepeakresponsespectrumandleadtosignificantchange.However,itwillaffecttheappearanceandthecompressorrefrigeratorsettings,theresearchresultsarenotyetappliedtoproducts.
Lubricantsandresidualvolume-coilmotorwindingswillleadtothesametypesofbulkcompressorlevelsbetweendifferent(fromlevelsaverage).Bychangingtheshellexternalsupporttoincreasetorsionalstiffnessandreducevibrationsurface;Noisestudythecomplexrequirementsofresearchersthequalitativephaseofexperimentalresearch,Alongwithagreatchanceandrandomness.
3.newrefrigerantsApplication
Basedonthenewenvironmentalrequirementsofrefrigerantcompressorrefrigerationindustryisathepastfewyearsmainlyconcentratedintheairconditioningindustry.ApartfromthenowrelativelymatureR410A,R407Cthestudy,Thelargestisthetheresearchandapplicationofconcentratedmainlyinthreeaspects:
oneisthemosturgentneedofalternativerefrigerantsapplications,suchasautomotiveairconditioning,asrefrigerantemissions,environmentalaspossiblewithoutendangeringtheenvironmentrefrigerants;theotheristoconsiderthecharacteristicsofCO2cycle,themostfavorabletotheuseofthiscycleofoccasions,Ifthereisasignificanttemperatureslipwill;anotheroneisCO2intoaccountthenatureofcyclecryogenicstagerefrigerants.
Compressortranscriticalcarbondioxideasanairconditioningsystemefficiencyandreliabilityofthemostaffectedparts,Itshouldbefullyintegratedsupercriticalcarbondioxidecyclespecificcharacteristicsofanewdesign.LikeammoniaandCO2,theadiabaticexponentKvaluethecompressordischargetemperaturereducethegapcompressorfurtherexpansionofthevolumelossestotheHorstSUBandfoundKruse,reciprocatingcompressorisagoodfilmslidingsealasthepreferredCO2system.8:
3itscarbondioxidecompressorexhaustvalveforimprovedExhaustimprovedcompressorefficiencyofcarbondioxideincreasedby7%.
Asthecarbondioxidepressureisfargreaterthanthet
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