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1、黑龙江工程学院本科生毕业设计附录外文文献原文：Thecommonlyusedsourcesofpowerinhydraulicsystemsarepumpsandaccumulators.Similarly,accumulatorconnectedtoatmospherewilldischangeoilatatmospherepressureuntilitempty.onlywhenconnectedtoasystemhavingresistancetoflowcanpressurebedeveloped.Threety
2、pesofpumpsfinduseinfluid-powersystems:rotary,reciprocatingorpiston-type,and3,centrifugalpumps.Simplehydraulicsystemmayusebutonetypeofpump.Thetrendistousepumpswiththemostsatisfactorycharacteristicsforthespecifictasksinvolved.Inmatchingthecharacteristicsofthepumpto
3、therequirementsofthehydraulicsystem,itisnotunusualtofindtwotypesofpumpsinseries.Forexample,acentrifugalpumpmaybetosuperchargeareciprocatingpump,orarotarypumpmaybeusedtosupplypressurizedoilforthecontronlsassociatedwithareversingvariabledisplacementpumps.Mostpowers
4、ystemsrequirepositivedisplacementpumps.Athighpressure,reciprocatingpumpsareoftenpreferredtorotarypumps.1、RotarypumpsThesearebuiltinmanydifferntdesignsandextremelypopularinmodernfluidpowersystem.Themostcommonrotay-pumpdesignsusedtodayarespurgear,internalgear,gener
5、atedrotor,slidingvane,andscreewpumps.Ehchtypehasadvantagesthatmakeitmostsuitableforagivenapplication.2、GearpumpsGearpumpsarethesimplesttypeoffixeddisplacementhydraulicpumpavailable.Thistypeconsistsoftwoexternalgear,generallyspurgear,withinaclosed-fittinghousing.O
6、neofthegearisdrivendirectlybythepumpdriveshaft.It,inturn,thendrivesthesecondgear.Somedesignsutilizehelicalgears,butthespurgeardesignpredominates.Gearpumpsoperateonaverysimpleprinciple.Asthegearteethunmesh,thevolumeattheinletportAexpands,apartialvacuumonthesuction
7、sideofthepumpwillbeformed.Fluidfromanexternalreservoirortankisforcedbyatmosphericpressureintothepump6黑龙江工程学院本科生毕业设计inlet.Thecontinuousactionofthefluidbeingcarriedfromtheinlettothedischargesideoneofthepumpforcesthefluidintothesystem.3、VanepumpsThevanepumpconsistso
8、fahousingthatiseccentricoroffsetwithrespecttothedriveshaftaxis.Insomemodelsthisinsidesurfaceconsistsofacamringthatcanberotatedtoshifttherelationshipbetweenroto
