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翻译.docx
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翻译
Centrifugalfanselectionsystem
【abstract】designandimplementationofanewtypeofcentrifugalfanselectionsystemandappliesit!
Internetnetwork,makingitcannotonlyfast,butalsoontheventilatorselectionandrealizetheventilatordatabasenetworkshare.Introducesthedesignidea,selectiontheoryandmethodandsystemfunction.
Thisarticle
Theventilatorselectiondesignisfanmanufacture,designinstitutesandtheuserhastodoit.Butthiskindofworkhasbeenprovidedbyartificiallyaccordingtotheparametertablefansampleselection.Thelowefficiencyofthemethodofartificialselection,cycleislong,theerror-prone.Thecurrentalongwiththerapiddevelopmentofcomputertechnologyandinenterprise'swidespreadpopularization,softwareforusersstartbroughtconvenientandbenefits.Nowtherearemanyresearchinstitutesanduniversitiesbegancombinationhasaccumulatedexperiencedataandexistingperformanceisgoodfanproducts,developedsomefanselectionsoftware,basiceffectivelysolvetheaboveproblem,makeadesignpersonnelfrommultifariouslaborinearnest.Becausetheventilatortypevariety,butnowmanyenterprises,universitiesself-developedventilator,theselectionofthesoftwareoffansampledataarenotcomplete,everyonefocusedonsomefan,andadataformatbecausethesoftwaredifferenttypes,itisdifficulttoachievedifferentsampledatasharing.FanNowtheInternettechnologyjustgloballyrapiddevelopment,people'swayofthinkingandworkingway,wayoflifeandthewaybusinessisconductedinagreatinnovationensue.ThedevelopmentoftheInternetfordevelopingtheventilator,realizefanselectionsystemaccordingtothedataoftherealsharingoffersanewthought--basedontheventilatorInterneselectionsystemonline.
Centrifugalfanisbasedontheprincipleofkineticenergytransferaspotentialenergy,usinghigh-speedrotatingimpelleraccelerated,thenthegasflowspeedandchange,makekineticenergyconvertedintoenergy(pressure).Inasingleclass,gascentrifugalfanfromaxialintoimpeller,gasflowingthroughtheimpeller,andthenwhenchangeintoradialdiffuserinto.Inthediffuser,gaseschangeddirectionofflowdeceleration,suchaslowdowneffectcausedatconvertingkineticenergyintopressurecan.Pressuremainlyinimpeller,secondlyoccurredinrisepressureprocess.Inmulti-stagecentrifugalfan,whichthebreathwithrefluxdeviceisunderpressure,producehigherwheel.
Centrifugalfanvariableflowisessentiallyaconstantpressuredevice.Whenspeedcentrifugalfancertainpressureflowtheorycurveshouldbeastraightline.Duetointernalloss,actualcharacteristiccurveiscurved.Centrifugalfanthepressureproducedinbytheinlettemperatureordensitychangemoretremendousinfluence.Foragiventhesubsystem,thehighesttemperature(airdensityminimum)producedbythelowestforagivenpressure.Thepressureandflowcharacteristiccurve,therewasapowerandflowcharacteristiccurve.Whenblowerwithconstantspeedoperation,foragivenflow,thepowerneededwiththereductionoftheinlettemperaturerise.
Centrifugalfandependontheinputenergyintomechanicalenergy,improvegaspressuresidebysideofmechanical,itsentgasisafolloweroffluidmachinery.Centrifugalfanwidelyusedinthefactory,mine,tunnel,coolingtower,vehicle,vesselandbuildingventilation,dischargingdustandcooling;Boilerandindustrialfurnacesventilationandleadthewind;Airconditioningequipmentandappliancesequipment;thecoolingandventilationGraindryingandsent;Windtunnelareinflatedandpromotethehovercraftandetc.
"Asglobalenergyshortages,fanislarge,especiallylargeandmedium-sizedfanenergyconsumptionperhourhundredsof,thousandsofkilowatts.Ifthefanoperationefficiencyimprovingtenpercent,soeveryhourcansavetensorhundredsofkW,energyconsumptionasifwith2000kW200kWorasanexample,sooneyearMay17.52~175.2millionkWelectricity,perdegreeifhastert,price,soannualcalculated0.4yuancansave7.008~70.08millionyuan.Thekeyisinthenationalpowersupplytensesituation,saveelectricitywillbringgreatersocialandeconomicbenefits.
InNovember19971"awardedbythestateenergyconservationlaw"andtherelatedenergysavingdocumentsalreadyproposedprohibitingmanufactureandsalesoflowefficiencyinenergysavingmeasuresoffan,alsoofferedtoimprovefanoperationefficiency.Improvetheefficiencyandoperatingefficiencyfanfanindustryhasbecomeanunshirkableresponsibility,alsoistheinevitabletrendofthefantechnology,isoneofthemeanstoparticipateinmarketcompetition.
Accordingtotheauthorunderstanding,centrifugalfanattheuser'ssiteoperationefficiencyisverylow,ubiquitous"bigmalahcar'phenomenon.Thetealfanoperationefficiencylowmainreasons:
oneisthecustomeraskingdemandperformanceparameters(namelyrunningconditionparameters)inaccurate,evendeviationisverybig,thegeneralsaidthelowerdeviationoperationefficiency.Itwasthefulfilmentofthecentrifugalfanpersonalizeddesign,makedesignconditionsinhighefficiencyarea,buttheactualoperatingconditionsdeviationdesignconditions,sofarasoperationefficiencyismuchlower.Secondisthefanmanufactureindustry,mostofthefactory,areinselectionsales,individualfactoryadopteddeformationdesign;Butthesearehardtoensurethatusersdemandperformanceparametersinhighefficiencyarea.
1.Fanselectionofproblemsneedingattention
Choosefan,firstofall,accordingtotheneedofthetotalpressureoftheairblower,thetwobasicparameters,canhavethroughthefansoceans.soperformancetable(fanproductmanualshavetheirrelateddata)determinethetypesandfanimmediately,thenmaybemorethanoneproducttomeetrequirements;ThencombinefanUSES,processrequirementsandapplicationoccasionetc,choosethetype,typefanandthestructuretomeettherequiredmaterialsuchasworkingconditions,strivetomaketheratedflowandfan,keepingclosetopressureratedtechnologicalrequirementsofflowandpressure,whichmakesuseofthefanoperationoperationpointsofhighefficientareanearfancharacteristics.Specificprinciplesasfollows:
1)inchoosingtheventilator,shouldunderstanddomesticventilatorbeforetheproductionandtheproductquality,suchasproductionoftheventilatorvarieties,specificationsandallkindsofproductspecialpurposes,newproductdevelopmentandpromotion,stillshouldfullyconsidertheneedofenvironment,sothatpreferentialnesschoosefan.
2)theventilatorconveyinggasesaccordingtothedifferentphysicalandchemicalpropertiesoftheventilator,choosedifferentUSES.IftheRanQiTiconveyinghasexplodedandvotingexplosion-prooffan;Rowsofpulverizedcoaldustortransportationshouldchoosetheventilatordischargingdustorcoal;Transportcorrosivegasshouldchooseanticorrosivefan;Workunderhightemperatureoccasioninhightemperaturegasorconveyingshouldchoosehightemperaturefan,etc.
3)intheventilatorchoiceperformancechartscheckmorethantherearetwokindsofchoices,theventilator,highefficiencyshouldbepreferredoptionimmediatelyadjustingrangeofsmaller:
large,ofcourse,stillshouldweightheadvantagesanddisadvantagesandtocompare,decision.
4)iftheselectedfanimpellerdiameteroffanthanoriginalimpelleristoobigalot,inordertousetheoriginalmotorshaft,bearingsandbearingetc,musttomotorstarttime,fanofstrengthandaxisoforiginalpartsascriticalspeedofcalculation.
5)choosecentrifugalfan,whenitsislessthanorequaltothemotorpower75KW,don'tfurnishthevalvewithonlytostart.Whentheexhausttemperaturefluegasorairandsendwhenthetwoboilerchoosecentrifugalshallestablishwithvalve,juststartrunningatthecoldcausedbyoverload.
6)requiredto10mventilationsystem,shouldbefirstchoosehighefficiency,lowspeedofimpellercircumferenceoftheventilator,inthehighestefficiencyandsomework;Stillshouldaccordingtotheventilationsystemofthenoiseandvibrationmodeoftransmission,adoptcorrespondingattenuationandvibrationreductionmeasures.Thefanandmotorvibrationdampingmeasure,generallycanusedampingbasis,suchasspringshockabsorberorrubbershockabsorber,etc.
7)inchoosingtheventilator,shouldavoidusingstudied.experementortandemwork.Whentheinevitable,shouldchoosetosharethesameperformance,theventilatorcombinedwork.Whentheseries,thefirstlevelbetweentheventilatorto2ventilatorisdueandcertainpipingcoupling.
8)selectednewfanshouldconsidermakefulluseoftheoriginalequipment,suitableforon-sitefabricationandinstallationandsafetyrunningetc.
2.Sewagetreatmentfansintheselectionproblemsshouldbepaidattentionto.
1.Thefanisusedinwastewatertreatmentengineeringoftheoxygenfillingequipment,inwastewatertreatmentplant,fanfanselectionontheproductsamplegivenmanufacturersareunderstandardintakestatusperformanceparameters,therequirementsofChina'sfanstandardintakestatus:
stressp0=101.3kPa=20℃T0,temperature,relativehumidityphi=50%,airdensityρ=1.2kg/m3.However,intheactualuseoffanisnotstandardstate,whenblowerenvironmentconditionssuchastemperature,atmosphericpressureandaltitude,etc,andtheperformanceofthefanwillchangeanddesignselectionwhenhecannotdirectlyusetheproductsample,andtheperformanceparametersaccordingtoactualusestatewillneedtheperformancerequirementsoffan,convertedtothestandardintakestatefanparameterstoselection.
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