泵的概述外文翻译.docx
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泵的概述外文翻译.docx
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泵的概述外文翻译
附录一:
外文文献原文
Pump'soutline
Thepumpistheapplicationverywidespreadgeneralmachinery,maysaythatisplaceofthefluidflow,nearlyhasthepumpinthework.Moreover,alongwithscience'sandtechnology'sdevelopment,pump'sapplicationdomainisexpandingrapidly,accordingtotheover-allstatestatistics,pump'spowerconsumptionapproximatelycomposesthenationaltotaloutputofelectricalenergy1/5,obviouslythepumpisnaturalconsumesenergythewealthyandpowerfulfamily.Therefore,raisesthepumptechnicalleveltosavetheenergyconsumptiontohavetheimportantmeaning.
First.Centrifugalpump'sprincipleofwork
Thedriveleadsimpellerrevolvingthroughthepumpspindletohavethecentrifugalforce,underthecentrifugalactionofforce,theliquidisflungalongtheleafbladeflowchanneltotheimpellerexport,theliquidsendsinafterthevolutecollectiontheeductiontube.Theliquidobtainstheenergyfromtheimpeller,causesthepressureenergyandthespeedcanincrease,anddependsuponthisenergythehydraulictransporttotheoperatinglocation.whiletheliquidisflungwhichexportstotheimpeller,theimpellereyecenterhasformedthelowpressure,hashadthedifferentialpressureintheimbibitionpotandbetweentheimpellercenterliquid,intheimbibitionpot'sliquidunderthisdifferentialpressurefunction,afterinhalesthepipelineandpump'ssuctionchamberunceasinglyentersintheimpeller.
Second,centrifugalpump'sstructureandmainsparepart
Acentrifugalpumpmainlybythepumpbody,theimpeller,thepackingring,therotationaxis,theaxissealspartsandsoonboxtobecomposed,somecentrifugalpumpsarealsoloadedwiththeguidepulley,theinducer,thebalancediscandsoon.
1.Pumpbody:
Namelypump'sshell,includingsuctionchamberanddeliverychamber.
①Suctionchamber:
Itsfunctionisenablestheliquidtoflowinevenlytheimpeller.
②Deliverychamber:
Itsfunctioncollectstheliquid,andsendsinitthesubordinateimpellerorguidestheeductiontube,atthesametimereducestheliquidthespeed,causesthekineticenergytofurtherturnthepressureenergy.Thedeliverychamberhasthevoluteandtheguidevanetwoforms.
2.Impeller:
Itisinthecentrifugalpumptransmitstheenergyfortheliquidonlypart,theimpellerwiththebondfixationontheaxis,leadsrevolvingalongwiththeaxisbytheprimemover,passestothroughtheleafbladeprimemover'senergytheliquid.
Impellerclassification:
①Accordingtoliquidinflowclassification:
Singlesuctionimpeller
(inimpeller'sonesidehasanentrance)anddoubleattractstheimpeller(liquidfromimpeller'slateralsymmetryliudaoimpellerpassage).
②Isoppositeaccordingtotheliquidincenterline'sflowdirectionclassification:
Runofftypeimpeller,axial-flowpropellerandinterflowtypeimpeller.
③Accordingtoimpeller'sstructuralstyleclassification:
Shroudedimpeller,opentypeimpellerandsemi-openedimpeller.
3.Axis:
Istransmitsthemechanicalenergytheimportantcomponents,theprimemover'storquepassestotheimpellerthroughit.Thepumpspindleisthepumprotor'smajorparts,ontheaxisisloadedwithcomponentsandsoonimpeller,axlesleeve,balancedisc.Thepumpspindledependingonthebothsidesbearingsupporting,makesthehighspeedrotationinthepump,thusthepumpspindleinabigwaywantsthebearingcapacity,tobewear-resisting,tobeanti-corrosive.Pumpspindle'smaterialselectsthecarbonsteelorthealloysteelandafterthequenchingandretemperingtreatmentgenerally.
4.Packingring:
Isinstallsintherotationimpellerandthestaticpumphousing(center-sectionandguidevane'sassembly)betweenpackingassembly.Itisfunctionisthroughcontrolsbetweenthetwogapmethod,increasesinthepumpbetweenthehighandlowpressurecavitythefluidflowresistance,reducesdivulging.
5.Axlesleeve:
Theaxlesleeveisusesfortoprotectthepumpspindle,causesitnottocorrodeandtheattrition.Whennecessity,theaxlesleevemayreplace.
6.Axisseals:
Thepumpspindleandaroundpackingboxbetweenendcover'sinstallsshortforaxistoseal,mainlypreventsinpump'sliquiddivulgingandtheairentersinthepump,achievessealsandpreventstheairadmissiontocausethepumpcavitationgoal.theaxissealsform:
Namelyhasskeleton'srubberseal,thepackingsealandthemechanicalseal.
7.axialforcebalancingunit.
Third.Centrifugalpump'sprimetaskparameter
1.Currentcapacity:
Namelythepumpinunitoftimedischargestheliquidquantity,usuallyindicatedwiththeUnitofvolumethatmarkQ,theunithasm3/h,m3/s,l/sandsoon,
2.Lifting:
Thetransportationunitweight'sliquid(pumpsuctionflange)(pumpdischargeflange)fromthepumpinletplacetothepumpexit,itsenergy'sincrement,indicatedwithH,theunitism.
3.Rotationalspeed:
Pump'srotationalspeedisthepumpeachminuterevolvingnumberoftimes,expressedwithN.ElectricalmachineryrotationalspeedNgenerallyabout2900n/min.
4.Netpositivesuctionhead:
Centrifugalpump'snetpositivesuctionheadisexpressedthatpump'sperformance'smainparameter,
usesthesymbolicrepresentation.
5.Powerandefficiency:
Pump'spowerinputisshaftpowerP,isalsoelectricmotor'soutput.Pump'soutputistheactivepower.
Fourth,pumpproperenergyloss
Pumpmechanicalenergywhichobtainsfromtheprimemover,hasaparttotransformintotheliquidenergy,butanotherpartbecauseinthepumpconsumesloses.Inthepumpalllossesmaydivideintothefollowingseveralitems:
1.Hydrauliclossbytheliquidinpumpimpact,theturbulentflowandthesurfacefrictioncreates.Theimpactandtheeddycurrentlossarebecausetheliquidflowchangedirectionproduces.Theliquidflowsthroughtheflowchannelgeneralmeetingwhichcontactstopresentthesurfacefriction,fromthisproducestheenergylossismainlydecidedbyflowchannel'slength,thesize,theshape,thesurfaceroughness,aswellasliquidspeedofflowandcharacteristic.
2.Volumetricloss:
volumetriclosswasalreadyobtainedtheenergyliquidtohaveaparttofleetheresultwhichinthepumptheclassandleakedoutward.Pump'svolumetricefficiency
is0.93~0.98generally.Improvesthepackingringandthesealstructure,mayreducetheleakage,raisesthevolumetricefficiency.
3.Mechanicallossmechanicallossreferstotheimpellerlapsideandthepumphousingfrictionlossbetweentheliquid,namelythediscloses,aswellaspumpspindlewhenpacking,bearingandbalancingunitandsoonmechanicalpartmovementfrictionloss,generallybeforeprimarily.
Fifth,pump'sspeedchange--Proportionalitylaw
1.Centrifugalpump'sspeedchange:
Acentrifugalpump,whenitsrotationalspeedchange,itsratedflow,liftingandtheshaftpowerwillhavethechangeaccordingtothecertainproportionrelations.Atpresent,usesthefrequencyconversionvelocitymodulationelectricalmachinerytorealizecentrifugalpump'sspeedchange,isanewimportantenergyconservationway.
2.proportionalitylawexpression:
Intheformula,Q,H,N--pump'sratedflow,liftingandshaftpowerThesubscript1,2expressthedifferentrotationalspeedseparately
n--rotationalspeed
Sixth,centrifugalpump'sratiorotation
Comparedtotherotationisthecomprehensiveparameterwhichderivesbythelawofsimilarity,itistheoperatingmodefunction,toapump,thedifferentoperatingmodehasdifferentlycomparedtotherotation,foreaseofcarriesonthecomparisontothedifferenttypepump'sperformanceandthestructure,theapplicationoptimumcondition(thepeakefficiencyspot)theratiorotationrepresentsthispump.
Whenchoosesthepump,mayaccordingtojobrequirementQ,Handunifieselectricalmachinery'srotationalspeed,calculatesthensnumber,determinespump'stypeapproximately.Atthattime,
usedthepositivedisplacementpumpgenerally,atthattime,
usedthecentrifugalpump,theinterflowpump,theaxialflowpumpandsoon.
Seventh,centrifugalpump's
cavitationandinspirationcharacteristic
1.Cavitationphenomenons
Thepumpingstationtransportationmedium'sliquidconditionandthegasarecantransformmutually,thetransformedconditionisthepressureandthetemperature.Undercertaintemperature,theliquidstartsthecriticalpressurewhichvaporizesforthevaporizationpressure.Thetemperatureishigher,theliquidvaporizationpressureishigher.Pumpwhenrevolution,ifitsoverflowpartlocalregion(forexampleimpellerbladeimportlatersomewhere),theliquidabsolutepressuredropswhenpulledoutdeliverstheliquidatthattimeunderthetemperaturevaporizationpressure,theliquidtheninthisplacestartstovaporize,thebubbleformation(airbubbleinternalpressureapproximatelywasequaltovaporizationpressure).Whentheseairbubblesalongwithliquidflowforwardmotiontohighpressureregion,downtoaroundtheairbubblehigh-pressuredliquidcausestheairbubbletoreducesuddenlycongeals.Whileairbubblevanishing,theliquidparticlebythehighspeedpackinghole,occurshitsmutuallyformstheintensepressuresurge,causestheoverflowparttoreceivethecorrosionandthedestruction.Theaboveprocessiscalledthecavitation.
2.Cavitationwillcauseseriousresults:
(1).hasthevibrationandthenoise.
(2).isinfluentialtopump'soperatingperformance:
Whenthecavitationdevelopsthecertainextent,thesteambubbleproducesmassively,willstopuptheflowchannel,willcausepump'scurrentcapacity,lifting,theefficiencyandsoonobviouslytodrop.
(3).willhavethedestructiontoflowchannel'smaterialquality:
Ismainlynearbytheleafbladeentrancethemetalweary
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