電子信息類專業(yè)英語(yǔ)(版)課本-李白萍

UnitThreeDataCommunicationsPassageADataCommunications

PassageBCharacteristicsofCommunicationChannels

PassageCCommunicationEquipmentandSoftware

PassageADataCommunicationsTherapidgrowthofdatacommunicationshasbeeninfluencedprimarilybytheincreasingneedtomoveinformationtoandfromcomputers.Moderntime-sharedcomputerscancommunicatewithmanydatastationssimultaneously.Otherformsofdatatransmissionwhichthetelephoneandtelegraphlinesarecalledupontohandlearebatchdatatransmission,real-timetransmission(asinthecaseofairlinereservationsystems),bankingandcreditdata,man-computerconversationwiththeaidofgraphics,datacollectionsystemsandautomaticmeterreading.Thecombinationofcomputersanddatacommunicationplacessuchnewrequirementsonthesystems,whichmusthandlethem,thatonecanrefertothembetterasteleprocessingratherthantelecommunications.[1]

Teleprocessingstartedwiththeairlinereservationsystems,wherethedistributionofcomputerdataisnotasimportantasthemaintenanceofaninventoryofseatsforthewholesystemandtheabilitytoaccesssuchaninventoryrapidlyatanumberofdistantpoints.Anotherexampleisthatofthebanks,whodesiredtocentralizetheiraccountingandprovideaccesstoacentralfileforalltheirbranches.Basically,therearethreereasonsforthedevelopmentofteleprocessingsystems:therequirementforcentralizedfiles,theneedtodistributecomputerservicesandtheadvantagegainedbyhavingflexibilityinlocationoftheoperatingstaffwhichutilizesthesystem.Initially,boththeairlineandbankingoperationscanbeestablishedonaprivatebasis,whichwouldminimizetheneedforswitchingoperations.Butinbothcases,theneedtoexpandbeyondprivateoperationssoonarises.Inthecaseoftheairlines,theneedarisestoaccessthefacilitiesofotherairlines;andinthecaseofthebanks,certaincommondatafacilitiesmaybesharedwithotherbanks.Eventhoughprivatenetworksmaysufficeformanyservices,theneedtoprovidedatacommunicationsbetweenurbancentersleadstoregionalandnationalnetworks.IntheU.S.,theBellSystem,theindependenttelephonecompaniesandspecializeddatacommunicationnetworksareinvolvedascarriersofsuchdata.Themostapplicablemodelfordatacommunicationsrequirementsisthecentralcomputerconversingwithmanysimpleterminalssimultaneously.Differingfromtelephonecommunications,adatacommunicationsnetworkmustbeabletointerconnectawidevarietyofsubscriber’sequipment.Severaldifferenttypesofcomputerperipheralsmayappearasnetworkterminals,andsoalsocancomputersfunctioninginseveraldifferentways.[2]Terminalspeedsrangingfrom100bitspersecto10,000bitspersecarelikelytobeimportant.Manyterminalsincurrentuseareconstrainedbytheavailablecommunicationsservices,butmanyofthemhavevariablespeeds.Oneapproachtothissituationistoprovideabufferstoreattheterminal,butthisapproachisexpensive.Atpresent,multi-accesscomputersusuallyhandleterminalsofonlyonespeedorwithasmallnumberoffixedspeeds.Ithasbeenproposedthatfeedbackfromtheoutputdevicebeusedtopermitonesimpleoutputprogramtodriveterminalswithdifferentcharacteristics.Ofcourse,suchfeedbacksignalswouldhavetobehandledbythecommunicationsnetwork.Atdatatechnologydevelops,eachmulti-accesscomputerisconnectedtoanincreasingnumberofterminals,makingitexpensiveanddifficulttoprovideseparatelinesfromthecomputertothenetworkforeachoftheterminals.Thus,aneedformultiplexedconnectionsbetweenthecomputerandtheterminalsarises.Butthisneedcannotnecessarilybemetinastraightforwardmanner.Onecharacteristicofadatacommunicationsnetworkdifferingfromconventionaltelephonenetworksisthatthetwoendsofthecommunicationlinkareverydifferent.Oneendisacomputercapableofflexiblebehavior,andtheotherendisarelativelyslowterminalwithnointelligence.Sincethetwoendsaresodifferent,itwouldappearthatthenetworkwouldcommunicatedifferentlywiththem.Theflowofinformationinadatacommunicationsystemisintermittentjustasitisinthecaseoftelephoneconversations.However,insteadofminutesofconversation,onlyafewsecondswillelapsefortheinformationflowinonedirection,followedbyapauseandsomeflowofinformationintheoppositedirection.Theaccesstimesfortypicalcomputersinuseatthistimeareabout100ms,butthiswillbecomefasterasbettermemoriesareutilized.[3]Thetimescalefortheinterchangeofdatamessagesneedstobeofthisorder.KEYWORDS

reservation保留，預(yù)定graphics圖示，圖解inventory清單，報(bào)表teleprocessing遠(yuǎn)程(信息)處理，遙控處理constrain約束，強(qiáng)迫multi-access多路存取，多路進(jìn)入feedback反饋，回授intelligence智能，智力，信息intermediate中間的elapse(時(shí)間)經(jīng)過(guò)，消失※※※becalleduponto用來(lái)…，(被)要求…withtheaidof借助于，用，通過(guò)appearas作為…出現(xiàn)belikelyto可能，大約，像要NOTES[1]?Thecombinationofcomputersanddatacommunicationplacessuchnewrequirementsonthesystems,whichmusthandlethem,thatonecanrefertothembetterasteleprocessingratherthantelecommunications.

計(jì)算機(jī)和數(shù)據(jù)通信的結(jié)合向系統(tǒng)提出必須對(duì)這些信息進(jìn)行處理的新要求，以至人們最好稱它們?yōu)檫h(yuǎn)程信息處理，而不是遠(yuǎn)程通信。

·?“thatone…telecommunications”為結(jié)果狀態(tài)從句。

·?“whichmusthandlethem”定語(yǔ)從句修飾“system”。

·句中“place”有“放置”的含義，這里引申為“提出”。

·在科技英語(yǔ)中，有時(shí)用“one”泛指“人們”。[2]?Severaldifferenttypesofcomputerperipheralsmayappearasnetworkterminals,andsoalsocancomputersfunctioninginseveraldifferentways.

幾種不同的計(jì)算機(jī)外圍設(shè)備可能作為網(wǎng)絡(luò)終端出現(xiàn)，幾種不同方式運(yùn)行的計(jì)算機(jī)也可能作為網(wǎng)絡(luò)終端出現(xiàn)。

·?“soalso…differentways”為并列句，該并列句主謂倒裝，用于強(qiáng)調(diào)。

·句中“so”表示“appearasnetworkterminals”，翻譯時(shí)應(yīng)重復(fù)敘述，使譯文表達(dá)更明確。[3]?Theaccesstimesfortypicalcomputersinuseatthistimeareabout100ms,butthiswillbecomefasterasbettermemoriesareutilized.

目前所用的典型計(jì)算機(jī)存取時(shí)間大約為100毫秒，但當(dāng)采用較好的存儲(chǔ)器時(shí)，存取時(shí)間將會(huì)縮短。

·?“butthiswill…areutilized”為并列句。其中“asbettermemoriesareutilized”為時(shí)間狀語(yǔ)從句。

·在科技英語(yǔ)中“as”運(yùn)用很靈活，此句“as”作連詞。EXERCISES1.?Fillintheblankswiththebestchoice.(1)?Thetypesofdatapacketare

modedatafromdigitalterminalsand______modedatafromothersources.a.digital,nondigital b.store-and-forward,nonstore-and-forwardc.packet,nonpacket d.computer,noncomputer(2)?Ascomparedwithcircuitswitching,thepacketswitchinghastheadvantagewhen

ischeap.a.transmissionmedium b.computingpowerc.bufferstorage d.processingpower(3)?ThemainelementsinARPAnetworkare

and

.a.interfacemessageprocessors,hostsb.localterminals,IMPsc.multi-accesscomputers,peripheralequipmentd.hosts,sharingcomputers2.?True/False.(1)TheARPAnetworkisalong-distanceprivatedatanetwork,whichcanincludeseveralmulti-access,time-sharingcomputersystemforswitchingpackets.()(2)Thehostcandumpacompletemessageintotheinterfacemessageprocessors,whichcanbeconnectedby50,000bitspersecondcircuits.()(3)Thelargestpublicpacket-switchingnetwork,throughwhich200databasesareaccessible,intheU.S.serves250computers,andlinkstogethercomputersinothercountries.()(4)Thepublicpacket-switchednetworkwillbeenhancedbyprovidingforconnectionbetweenthepublictelephonenetworkandthepacketnetwork.()3.?Answerthequestions.(1)Whatarethedifferencesbetweenpacket-switchingnetworkandconventionalstore-and-forwardnetwork?(2)?WhatisthefunctionoftheARPAnetwork?PassageBCharacteristicsofCommunicationChannelsDatacommunicationsistheelectronictransmissionofinformationincludingdata,televisionpictures,soundandfacsimiles.Itusuallyinvolvesacomputer,amodem,software,andaprinter.Withthisequipment,youcancommunicatewithafriendinSt.Louis,Missouri,orParis,France,sendingandreceivinganythingfromamanuscripttoasimplemessageoverthetelephonelines.Usingthesamemethod,ahome-boundchildcaninteractwithateacherintheclassroom,anofficeworkercanworkathome,andadoctorcanaccessaremotecomputerforresearchdata.Thereasonsforusingcommunicationssystemareconvincing.It·isexpedientandefficient,·lessensjobstress,·decreasescarpollution,·savestimeandmoney,·allowsthehometoserveasanoffice,and·promotesdistantlearninginwhichstudentscanshareinformationandcomputerresearch?findings.Whenyouconnectonecomputertoanother,youusehardwareandsoftware.Inthemajorityofcases,thehardwareconsistsofequipmentthatsendsthedataoversometypeofcommunicationsline,suchasatelephoneline.Thesoftwarecontrolstheflowofthisdata.Thenecessaryhardwareconsistofamodemandtelephonelines.Themodemmodulatesthecomputeroutputtoanacceptablesignalfortransmissionandthendemodulatesthesignalbackforcomputerinput.Themodemonthetransmittingcomputerconvertsthedigitalsignalstomodulatedanalogsignaltonesandtransmitsthemoverthetelephonelines.[1]Thereceivingcomputer’smodemtransformstheincominganalogsignalsbacktotheirdigitalequivalentsinordertounderstandthem.TransmissionRateThetransmissionrateofacommunicationschannelisdeterminedbyitsbandwidthanditsspeed.Thebandwidthistherangeoffrequenciesthatachannelcancarry.Sincetransmitteddatacanbeassignedtodifferentfrequencies,thewiderthebandwidth,themorefrequencies,andthemoredatacanbetransmittedatthesametime.Thespeedatwhichdataistransmittedisusuallyexpressedasbitspersecondorasabaudrate.Bitspersecond(bps)isthenumberofbitsthatcanbetransmittedinonesecond.Usinga10-bitbytetorepresentacharacter(7databits,1start,1stop,and1paritybit),a2,400bpstransmissionwouldtransmit240characterspersecond.Atthisrate,a20,single-spacedreportwouldbetransmittedinapproximatelyfiveminutes.Thebaudrateisthenumberoftimespersecondthatsignalbeingtransmittedchanges.Witheachchange,oneormorebitscanbetransmitted.Atspeedsupto2,400bps,usuallyonlyonebitistransmittedpersignalchangeand,thus,thebitspersecondandthebaudratearethesame.Toachievespeedsinexcessof2,400bps,morethanonebitistransmittedwitheachsignalchangeand,thus,thebpswillexceedthebaudrate.DirectionofTransmissionThedirectionofdatatransmissionisclassifiedaseithersimplex,half-duplex,orfull-duplex.Insimplextransmission,dataflowsinonedirectiononly.Simplexisusedonlywhenthesendingdevice,suchasatemperaturesensor,neverrequiresaresponsefromthecomputer.Forexample,ifacomputerisusedtocontrolthetemperatureofabuilding,numeroussensorsareplacedthroughoutit.Eachsensorisconnectedtothecomputerwithasimplextransmissionlinebecausethecomputeronlyneedstoreceivedatafromthetemperaturesensorsanddoesnotneedtosenddatabacktothesensors.[2]

Inhalf-duplextransmission,datacanflowinbothdirectionsbutinonlyonedirectionatatime.Anexampleisacitizensbandradio.Theusercantalkorlistenbutnotdobothatthesametime.Half-duplexisoftenusedbetweenterminalsandacentralcomputer.Infull-duplextransmission,datacanbesentinbothdirectionsatthesametime.Anormaltelephonelineisanexampleoffull-duplextransmission.[3]Bothpartiescantalkatthesametime.Full-duplextransmissionisusedformostinteractivecomputerapplicationsandforcomputer-to-computerdatatransmission.TransmissionModes:AsynchronousandSynchronousInasynchronoustransmissionmode(Figure3.1),individualcharacters(madeupofbits)aretransmittedatirregularintervals,forexample,whenauserentersdata.Todistinguishwhereonecharacterstopsandanotherstarts,theasynchronouscommunicationmodeusesastartandastopbit.Anadditionalbitcalledaparitybitissometimesincludedattheendofeachcharacter,andtheydetectifoneofthedatabitshasbeenchangedduringtransmission.Theasynchronoustransmissionmodeisusedforlowerspeeddatatransmissionandisusedwithmostcommunicationsequipmentdesignedforpersonalcomputers.Figure3.1Inthesynchronoustransmissionmode(Figure3.1),largeblocksofdataaretransmittedatregularintervals.Timingsignalssynchronizethecommunicationsequipmentatboththesendingandreceivingendsandeliminatetheneedforstartandstopbitsforeachcharacter.Error-checkingbitsandstartandendindicatorcalledsyncbytesarealsotransmitted.Synchronoustransmissionrequiresmoresophisticatedandexpensiveequipment,butitdoesgivemuchhigherspeedsandaccuracythanasynchronoustransmission.KEYWORDS

bps(bitspersecond)每秒鐘傳輸?shù)谋忍豣audrate波特率simplextransmission單工傳輸half-duplextransmission半雙工傳輸full-duplextransmission全雙工傳輸asynchronoustransmission異步傳輸?synchronoustransmission同步傳輸NOTES[1]?Themodemonthetransmittingcomputerconvertsthedigitalsignalstomodulatedanalogsignaltonesandtransmitsthemoverthetelephonelines.

發(fā)送端計(jì)算機(jī)的調(diào)制解調(diào)器把數(shù)字信號(hào)調(diào)制為模擬信號(hào)，并通過(guò)電話線發(fā)送出去。

·主句結(jié)構(gòu)為“Themodem…converts…andtransmits…”。[2]?Eachsensorisconnectedtothecomputerwithasimplextransissionlinebecausethecomputeronlyneedstoreceivedatafromthetemperaturesensorsanddoesnotneedtosenddatabacktothesensors.

每一個(gè)傳感器都通過(guò)一根單工傳輸線連接到計(jì)算機(jī)上，這是因?yàn)橛?jì)算機(jī)只需要接收來(lái)自溫度傳感器的數(shù)據(jù)，而不需要向傳感器發(fā)送數(shù)據(jù)。[3]?Anadditionalbitcalledaparitybitissometimesincludedattheendofeachcharcter,andtheydetectifoneofthedatabitshasbeenchangedduringtransmissiom.

在每個(gè)字符的后面有時(shí)還包括一個(gè)稱為奇偶校驗(yàn)位的附加位，它們測(cè)試數(shù)據(jù)位在傳輸過(guò)程中是否被意外改變。

·they指的是aparitybit。EXERCISES1.?Fillintheblankswiththebestchoice.(1)?Thetermmodemisderivedfromthewords

.a.modulateemphasis b.modularemulationc.multiplexordemultiplexer d.modulatedemodulate(2)?Datatransmissionspeedismeasuredin

.a.bps——bytespersecond b.bps——bitspersecondc.bps——blockspersecond d.bps——bufferspersecond(3)?Thetransmissionmethodwhichusesstartstopbitsaftereachcharacteris

.a.synchronous b.asynchronousc.fullduplex d.noneofabove(4)?A(n)

convertsdatafrompulseformtowaveformandbackagain.a.modem b.controlunit c.channel d.interface(5)Devicesormediathatoperateatdifferentspeedscanbesynchronizedbyusinga

.a.buffer b.dataset c.line d.modem(6)?Thetransmissionmethodwhichsendsmultiplecharactersinablockis

.a.synchronous b.asynchronous c.simplex d.half-duplex(7)?In

transmission,datacanbesentinbothdirectionsatthesametime.a.simplex b.half-duplex c.full-duplex d.noneofabove(8)?Whenthesendingdevice,suchasatemperaturesensor,neverrequiresaresponsefromthecomputer,weshoulduse

transmission.a.full-duplex b.half-duplex c.simplex d.noneofabove(9)?Usinga10-bitbytetorepresentacharacter(7databits,1start,1stop,and1paritybit),a2,400bpstransmissionwouldtransmit

charactersintwoseconds.a.120 b.240 c.480 d.720(10)?

scansapieceofpaperandconvertsitsimageintocodedformfortransmissionoverthetelephonesystem.a.Scanner b.Modemc.Printerd.Faxmachine2.?Answerthequestions.(1)?Describethebasiccomponentsofacommunicationssystem.(2)?Listanddescribethethreetypesofdatatransmission(direction)thatareused.(3)?Describethetransmissionmodes:asynchronousandsynchronous.PassageCCommunicationEquipmentandSoftwareIfaterminalorapersonalcomputeriswithinapproximately100feetofanothercomputer,thetwodevicescanusuallybedirectlyconnectedbyascale.Over1,000feet,however,theelectricalsignalweakenstothepointthatsometypeofspecialcommunicationsequipmentisrequiredtoincreaseorchangethesignaltotransmititfarther.Avarietyofcommunicationsequipmentexiststoperformthistask,buttheequipmentthatauserismostlikelytoencounterismodems,fax/modems,faxmachine,etc.ModemsAmodemconvertsthedigitalsignalsofaterminalorcomputertoanalogsignalsthataretransmittedoveracommunicationschannel.Italsoconvertsanalogsignalsitreceivesintodigitalsignalsthatareusedbyaterminalorcomputer.Thewordmodemcomesfromacombinationofthewordsmodulate,whichmeanstochangeintoasoundoranalogsignal,anddemodulate,whichmeanstoconvertananalogsignalintoadigitalsignal.Amodemisneededatboththesendingandreceivingendsofacommunicationschannel.Anexternalmodemisaseparate,orstand-alone,devicethatisattachedtothecomputerorterminalbyacableandtothetelephoneoutletbyastandardtelephonecord.Anadvantageofanexternalmodemisthatitcanbeeasilymovedfromoneterminalorcomputertoanother.Aninternalmodemisacircuitboardthatisinstalledinsideacomputerorterminal.Internalmodemsaregenerallylessexpensivethancomparableexternalmodemsbutonceinstalled,theyarenotaseasyasmove.Fax/ModemsBesidessendingandreceivingdata,manymodemstodaycananswerthetelephonethewayanansweringmachinedoesandstorethemessageontheharddisk.Someevenhavecomprehensivevoice-mailcapabilitiessimilartobusinessvoice-mailsystems.Furthermore,themajorityofmodemshavefacsimile(fax)capabilities;thatis,theycansendgraphicimagesandtextbetweendistantlocations.Suchmodemsemulatefaxmachines,allowingyoutoreceiveandsendfaxtransmissionsdirectlyviayourcomputer.Afax/modemisdifferentfromastandardfaxmachineinthewayithandlesdocuments.Thefax/modemcanonlysenddocumentsthatarealreadyinthecomputer;theycandisplaythedocumentsonthecomputerscreenorprintthemwhentheyreceivethem.Howdoesthefax/modemuserfaxdocumentsnotinputtedintothecomputer?Onewayistouseascannertoscandocumentsintothecomputer.Nevertheless,thetraditionalfaxmachineismoreversatilethanthefax/modem.Itisalsomoreexpensive.FaxMachinesThededicatedfaxmachineisacombinationscanner,faxmodem,andprinter.Thismachinescansapieceofpaperandconvertsitsimageintocodedformfortransmissionoverthetelephonesystem.Ontheotherend,afaxmachinereconvertsthetransmittedcodeandprintsoutafacsimileoftheoriginalsheetofpaper.Sometimescommunicationsequipmentispreprogrammedtoaccomplishitsdesignedcommunicationstasks.Othertimes,theusermustloadaprogrambeforetransmittingdata.Theseprograms,referredtoascommunicationssoftware,canperformanumberoftasksincludingdialing(ifaswitchedtelephonelineisused),filetransferanddataencryption,etc.Dialingsoftwareallowsyoutostore,review,selectanddialtelephonenumbersofcomputersthatcanbecalled.Thesoftwareprovidesavarietyofmeaningfulmessagestoassistyouinestablishingaconnectionbeforetransmittingdata.Forexample,apersonwhousesapersonalcomputerathometocommunicatewithacomputerattheofficecouldusedialingsoftwaretoestablishthecommunicationsconnection.Thesoftwarewoulddisplaytheofficecomputer’stelephonenumberontheuser’spersonalcomputerscreen.Theuserwouldentertheappropriatecommandforthedialingsoftware,workingwithamodem,tobegindialingtheofficecomputerandtoestablishaconnection.Duringthe10or15secondsthatthisprocesstakes,thesoftwarewoulddisplaymessagestoindicatespecificallywhatwashappening,suchas“DIALING”,“CARRIERDETECT”?(whichmeansthattheofficecomputerhasanswered),and“CONNECTED”(toindicatethatthecommunicationsconnectionhasbeenestablishedanddatatransmissioncanbegin).Filetransfersoftwareallowsyoutomoveoneormorefilesfromonesystemtoanother.Generally,youhavetoloadthefiletransfersoftwareonboththesendingandreceivingcomputers.Dataencryptionprotectsconfidentialdataduringtransmission.Dataencryptionistheconversionofdataatthesendingendintoanunrecognizablestringofcharactersorbitsandthere-conversionofthedataatthereceivingend.Withoutknowinghowthedatawasencrypted,someonewhointerceptedthetransmitteddatawouldhaveadifficulttimedeterminingwhatthedatameant.第一節(jié)活塞式空壓機(jī)的工作原理第二節(jié)活塞式空壓機(jī)的結(jié)構(gòu)和自動(dòng)控制第三節(jié)活塞式空壓機(jī)的管理復(fù)習(xí)思考題單擊此處輸入你的副標(biāo)題，文字是您思想的提煉，為了最終演示發(fā)布的良好效果，請(qǐng)盡量言簡(jiǎn)意賅的闡述觀點(diǎn)。第六章活塞式空氣壓縮機(jī)

piston-aircompressor壓縮空氣在船舶上的應(yīng)用：

1.主機(jī)的啟動(dòng)、換向；

2.輔機(jī)的啟動(dòng)；

3.為氣動(dòng)裝置提供氣源；

4.為氣動(dòng)工具提供氣源；

5.吹洗零部件和濾器。

排氣量:單位時(shí)間內(nèi)所排送的相當(dāng)?shù)谝患?jí)吸氣狀態(tài)的空氣體積。單位：m3/s、m3/min、m3/h第六章活塞式空氣壓縮機(jī)

piston-aircompressor空壓機(jī)分類：按排氣壓力分：低壓0.2～1.0MPa；中壓1～10MPa；高壓10～100MPa。按排氣量分：微型<1m3/min；小型1～10m3/min；中型10～100m3/min；大型>100m3/min。第六章活塞式空氣壓縮機(jī)

piston-aircompressor第一節(jié)活塞式空壓機(jī)的工作原理容積式壓縮機(jī)按結(jié)構(gòu)分為兩大類：往復(fù)式與旋轉(zhuǎn)式兩級(jí)活塞式壓縮機(jī)單級(jí)活塞壓縮機(jī)活塞式壓縮機(jī)膜片式壓縮機(jī)旋轉(zhuǎn)葉片式壓縮機(jī)最長(zhǎng)的使用壽命-

低轉(zhuǎn)速（1460RPM），動(dòng)件少（軸承與滑片），潤(rùn)滑油在機(jī)件間形成保護(hù)膜，防止磨損及泄漏，使空壓機(jī)能夠安靜有效運(yùn)作；平時(shí)有按規(guī)定做例行保養(yǎng)的JAGUAR滑片式空壓機(jī)，至今使用十萬(wàn)小時(shí)以上，依然完好如初，按十萬(wàn)小時(shí)相當(dāng)于每日以十小時(shí)運(yùn)作計(jì)算，可長(zhǎng)達(dá)33年之久。因此，將滑片式空壓機(jī)比喻為一部終身機(jī)器實(shí)不為過(guò)?；?葉)片式空壓機(jī)可以365天連續(xù)運(yùn)轉(zhuǎn)并保證60000小時(shí)以上安全運(yùn)轉(zhuǎn)的空氣壓縮機(jī)1.進(jìn)氣2.開(kāi)始?jí)嚎s3.壓縮中4.排氣1.轉(zhuǎn)子及機(jī)殼間成為壓縮空間，當(dāng)轉(zhuǎn)子開(kāi)始轉(zhuǎn)動(dòng)時(shí)，空氣由機(jī)體進(jìn)氣端進(jìn)入。2.轉(zhuǎn)子轉(zhuǎn)動(dòng)使被吸入的空氣轉(zhuǎn)至機(jī)殼與轉(zhuǎn)子間氣密范圍，同時(shí)停止進(jìn)氣。3.轉(zhuǎn)子不斷轉(zhuǎn)動(dòng)，氣密范圍變小，空氣被壓縮。4.被壓縮的空氣壓力升高達(dá)到額定的壓力后由排氣端排出進(jìn)入油氣分離器內(nèi)。4.被壓縮的空氣壓力升高達(dá)到額定的壓力后由排氣端排出進(jìn)入油氣分離器內(nèi)。1.進(jìn)氣2.開(kāi)始?jí)嚎s3.壓縮中4.排氣1.凸凹轉(zhuǎn)子及機(jī)殼間成為壓縮空間，當(dāng)轉(zhuǎn)子開(kāi)始轉(zhuǎn)動(dòng)時(shí)，空氣由機(jī)體進(jìn)氣端進(jìn)入。2.轉(zhuǎn)子轉(zhuǎn)動(dòng)使被吸入的空氣轉(zhuǎn)至機(jī)殼與轉(zhuǎn)子間氣密范圍，同時(shí)停止進(jìn)氣。3.轉(zhuǎn)子不斷轉(zhuǎn)動(dòng)，氣密范圍變小，空氣被壓縮。螺桿式氣體壓縮機(jī)是世界上最先進(jìn)、緊湊型、堅(jiān)實(shí)、運(yùn)行平穩(wěn)，噪音低，是值得信賴的氣體壓縮機(jī)。螺桿式壓縮機(jī)氣路系統(tǒng)：

A

進(jìn)氣過(guò)濾器

B

空氣進(jìn)氣閥

C

壓縮機(jī)主機(jī)

D

單向閥

E

空氣/油分離器

F

最小壓力閥

G

后冷卻器

H

帶自動(dòng)疏水器的水分離器油路系統(tǒng)：

J

油箱

K

恒溫旁通閥

L

油冷卻器

M

油過(guò)濾器

N

回油閥

O

斷油閥冷凍系統(tǒng)：

P

冷凍壓縮機(jī)

Q

冷凝器

R

熱交換器

S

旁通系統(tǒng)

T

空氣出口過(guò)濾器螺桿式壓縮機(jī)渦旋式壓縮機(jī)

渦旋式壓縮機(jī)是20世紀(jì)90年代末期開(kāi)發(fā)并問(wèn)世的高科技?jí)嚎s機(jī)，由于結(jié)構(gòu)簡(jiǎn)單、零件少、效率高、可靠性好，尤其是其低噪聲、長(zhǎng)壽命等諸方面大大優(yōu)于其它型式的壓縮機(jī)，已經(jīng)得到壓縮機(jī)行業(yè)的關(guān)注和公認(rèn)。被譽(yù)為“環(huán)保型壓縮機(jī)”。由于渦旋式壓縮機(jī)的獨(dú)特設(shè)計(jì)，使其成為當(dāng)今世界最節(jié)能壓縮機(jī)。渦旋式壓縮機(jī)主要運(yùn)動(dòng)件渦卷付，只有磨合沒(méi)有磨損，因而壽命更長(zhǎng)，被譽(yù)為免維修壓縮機(jī)。

由于渦旋式壓縮機(jī)運(yùn)行平穩(wěn)、振動(dòng)小、工作環(huán)境安靜，又被譽(yù)為“超靜壓縮機(jī)”。

渦旋式壓縮機(jī)零部件少，只有四個(gè)運(yùn)動(dòng)部件,壓縮機(jī)工作腔由相運(yùn)動(dòng)渦卷付形成多個(gè)相互封閉的鐮形工作腔，當(dāng)動(dòng)渦卷作平動(dòng)運(yùn)動(dòng)時(shí)，使鐮形工作腔由大變小而達(dá)到壓縮和排出壓縮空氣的目的?；钊娇諝?/p>