螺杆压缩机的设计外文文献翻译中英文翻译外文翻译.docx
- 文档编号:5109974
- 上传时间:2022-12-13
- 格式:DOCX
- 页数:12
- 大小:426.02KB
螺杆压缩机的设计外文文献翻译中英文翻译外文翻译.docx
《螺杆压缩机的设计外文文献翻译中英文翻译外文翻译.docx》由会员分享,可在线阅读,更多相关《螺杆压缩机的设计外文文献翻译中英文翻译外文翻译.docx(12页珍藏版)》请在冰豆网上搜索。
螺杆压缩机的设计外文文献翻译中英文翻译外文翻译
英文原文
ScrewMachineDesign
Holmes,1999reportedthatevenhigheraccuracywasachievedonthenewHolroydvitrifyingthread-grindingmachine,thuskeepingthemanufacturingtoleranceswithin3μmeveninlargebatchproduction.Thismeansthat,asfarasrotorproductionaloneisconcerned,clearancesbetweentherotorscanbeassmallas12μm.
Screwmachinesareusedtodayfordifferentapplicationsbothascompressorsandexpanders.
Fig.1.4.Screwcompressormechanicalparts
Fig.1.5.Crosssectionofascrewcompressorwithgearbox
Foroptimumperformancefromthemaspecificdesignandoperatingmodeisneededforeachapplication.Hence,itisnotpossibletoproduceefficientmachinesbythespecificationofauniversalrotorconfigurationorsetofworkingparameters,evenforarestrictedclassofmachines.
Industrialcompressorsarerequiredtocompressair,refrigerantsandprocessgases.Foreachapplicationtheirdesignmustdiffertoobtainthemostdesirableresult.Typically,refrigerationandprocessgascompressors,whichoperateforlongperiods,musthaveahighefficiency.Inthecaseofaircompressors,especiallyformobileapplications,efficiencymaybelessimportantthansizeandcost.
Oilfreecompressedairisdeliveredalmostexclusivelybyscrewcompressors.Thesituationisbecomingsimilarforthecaseofprocessgascompression.Inthefieldofrefrigeration,reciprocatingandvanecompressorsarecontinuouslybeingreplacedbyscrewandadramaticincreaseintheneedsforrefrigerationcompressorsisexpectedinthenextfewyears.
Therangeofscrewcompressorssizescurrentlymanufacturediscoveredbymalerotordiametersof75to620mmandthispermitsthedeliveryofcompressedgasflowratesof0.6m3/minto600m3/min.Apressureratioof3.5isattainableinthemfromasinglestagefordrycompressorsandupto15foroilfloodedones.Normalpressuredifferencesareupto15bars,butmaximumpressuredifferencessometimesexceed40bars.Typically,foroilfloodedaircompressionapplications,thevolumetricefficiencyofthesemachinesnowexceeds90%andthespecificpowerinputhasbeenreducedtovalueswhichwereregardedasunattainableonlyafewyearsago.
1.1ScrewCompressorPractice
TheSwedishcompanySRMwasapioneerandtheyarestillleadersinthefieldofscrewcompressorpractice.Othercompanies,likeCompairU.K.,Atlas-CopcoinBelgium,Ingersol-RandandGardnerDenverintheUSAandGHHinGermanyfollowthemclosely.York,TraneandCarrierleadinscrewcompressorapplicationsforrefrigerationandairconditioning.Japanesescrewcompressormanufacturers,likeHitachi,MycomandKobe-Steelarealsowellknown.ManyrelativelynewscrewcompressorcompanieshavebeenfoundedintheMiddleandFarEast.NewmarketsinChinaandIndiaandinotherdevelopingcountriesopennewscrewcompressorfactories.AlthoughnotdirectlyinvolvedincompressorproductiontheBritishcompany,Holroyd,arethelargestscrewrotormanufacturer,theyareworldleadersintooldesign
andtoolmachineproductionforscrewcompressorrotors.
Despitetheincreasingpopularityofscrewcompressors,publicknowledgeandunderstandingofthemisstilllimited.ThreescrewcompressortextbookswerepublishedinRussianintheearlynineteensixties.Sakun,1960givesafulldescriptionofcircular,ellipticandcycloidalprofilegenerationandareproduciblepresentationofaRussianasymmetricprofilenamedSKBK.The
profilegenerationinhisbookwasbasedonanenvelopeapproach.Andreev,1961repeatsthetheoryofscrewprofilesandmakesacontributiontorotortoolprofilegenerationtheory.Golovintsov’stextbook,1964,ismoregeneralbutitssectiononscrewcompressorsisbothinterestingandinformative.Asomov,1977,alsoinRussian,gaveareproduciblepresentationoftheSRMasymmetricprofile,fiveyearsafteritwaspatented,togetherwiththeclassicLysholmProfile.
TwotextbookshavebeenpublishedinGerman.Rinder,1979,presentedaprofilegenerationmethodbasedongeartheorytoreconstructtheSRMasymmetricprofile,sevenyearsafteritwaspatented.Konka,1988,publishedsomeengineeringaspectsofscrewcompressors.OnlyrecentlyanumberoftextbookshavebeenpublishedinEnglish,whichdealwithscrewcompressors.O’Neill,1993,onindustrialcompressorsandArbon,1994,onrotarytwinshaftcompressors.Thereareafewcompressormanufacturers’handbooksonscrewcompressorsandanumberofbrochuresgivingusefulinformationonthem,buttheseareeitherclassifiedornotinthepublicdomain.Someofthem,liketheSRMDataBook,althoughavailableonlytoSRMlicensees,arecitedinliteratureonscrewcompressors.
Thereisanextraordinarilylargenumberofpatentsonscrewcompressors.Literallythousandshaveappearedinthepastthirtyyears,ofwhichSRM,alone,holds750.Thepatentsdealwithvariousaspectsofthesemachines,butespeciallywiththeirrotorprofiles.TheSRMpatentsofNilson,1952,forthesymmetricprofile,Shibbie,1979,fortheasymmetricprofileandAstberg1982,forthe“D”profilearethemostwidelyquotedinreferenceliteratureonthistopic.Ohman,1999,introducedthe“G”profileforSRM.Otherexamplesofsuccessfulprofilingpatentsmayalsobementioned,namely:
Atlas-Copco,CompairwithHough,1984,GardnerDenverwithEdstroem,1974,HitachiwithKasuya,1983,andIngersoll-RandwithBowman,1983.Morerecently,severalhighlysuccessfulpatentsweregrantedtorelativelysmallcompaniessuchasFuSheng,Lee,1988,andHanbel,Chia-Hsing,1995.Anewapproachtoprofilegeneration,usingarackasthebasisfortheprimarycurves,wasproposedbyRinder,1987,andStosic,1996.
Allpatentedprofilesweregeneratedbyaprocedurebutinformationonthemethodsusedishardlydisclosedeitherinthepatentsorinaccompanyingpublications.Thusittookmanyyearsbeforetheseproceduresbecameknown.Examplesofthisare:
Margolis,whopublishedhisderivationofthesymmetriccircularprofilein1977,32yearsafterithadbeenpatentedandRinder,whousedgearmeshingcriteriatoreproducetheSRMasymmetricprofilein1979,9yearsafterpatentpublication.ItmayalsobementionedthatTang,1995,derivedtheSRM“D”profileanalyticallyaspartofaPhDthesis13yearsafterthepatentpublication.Manyotheraspectsofscrewcompressorswerealsopatented.Theseincludenearlyalltheirmostwellknowncharacteristics,suchas,oilflooding,thesuctionanddischargeportsfollowingtherotortiphelices,axialforcecompensation,unloading,theslidevalveandtheeconomiserport,mostofwhichwerefiledbySRM.However,othercompanieswerealsokeentofilepatents.Thegeneralimpressiongainedisthatpatentexpertsareasimportantforscrewcompressordevelopmentasengineers
Thereisasurprisinglackofscrewcompressorpublicationsinthetechnicalliterature.Lysholm’spapersin1942and1966wereamidtwentiethcenturyexception,buthedidnotincludeanydetailsoftheprofilingdetailswhichheintroducedtoreducetheblow-holearea.Thus,journalpaperslikethoseofStosicetal.,1997,1998,mayberegardedasanexception.Inrecentyears,publicationofscrewcompressormaterialsinjournalshasbecomemorecommonthroughtheInternationalInstitutionofRefrigerationStosic,1992andFujiwara,1995,theIMechE,withpapersbySmith,1996,Fleming,1994,1998andStosic1998,andtheASME,byHanjalic,1997.Togetherthesemademoreinformationavailablethanthetotalpublishedinallpreviousyears.Stosic’s,1998paperisatypicalexampleofthemodernpracticeoftimelypublishing.
Therearethreecompressorconferenceswhichdealexclusivelyorpartlywithscrewcompressors.Thesearethebiennialcompressortechnologyconference,heldatPurdueUniversityintheUSA,theIMechEinternationalconferenceoncompressorsandtheirsystems,inEnglandandthe“VDISchraubenkompressorenTagung”inDortmund,Germany.Despitethenumber
ofpapersonscrewcompressorspublishedattheseevents,onlyafewofthemcontainusefulinformationonrotorprofilingandcompressordesign.TypicalPurduepaperscitedaspublicationsfromwhichareadercangaininformationonthisare:
Edstroem,1992,Stosic,1994andSingh,1984,1990.Zhang,1992,indicatesthattheyusedenvelopetheorytocalculatesomegeometricfeaturesoftheirrotors.TheDortmundproceedingsgivesomeinterestingpaperssuchasthatbyRinder,1984,whopresentedtherackgenerationofascrewrotorprofile,includingafullyreproduciblepatternbasedongeartheory.Hanjalic,1994andHolmes,1994,givemoredetailsonprofiling,manufacturingandcontrol.Kauder,1994,1998andStosic,1998aretypicalexamplesofsuccessfuluniversityreseachappliedtorealengineering.Sauls,1994,1998,mayberegardedasanexampleoffineengineeringwork.TheLondoncompressorconferenceincludedsomeinterestingpaperslikethoseofEdstroem,1989andStosicetal.,1999.
Manyreferencetextbooksongearsgiveusefulbackgroundforscrewrotorprofiling.Howeverallofthemarelimitedtotheclassicalgearconjugateactioncondition.Litvin,1968and1956–1994mayberegardedasanexceptiontothispractice,ingivinggearingtheorywhichcanbeapplieddirectlytoscrewcompressorprofiling.
1.2RecentDevelopments
Theefficientoperationofscrewcompressorsismainlydependentonproperrotordesign.Anadditionalandimportantrequirementforthesuccessfuldesignofalltypesofcompressorisanabilitytopredictaccuratelytheeffectsonperformanceofthechangeinanydesignparametersuchasclearance,rotorprofileshape,oilorfluidinjectionpositionandrate,rotordiameterandproportionsandspeed.
Now,whenclea
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 螺杆 压缩机 设计 外文 文献 翻译 中英文