【DOC】-外文翻译--泵站中水泵的选型问题-其他专业

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5、ignsandareextremelypopularinmodernfluid-powersystem.Themostcommonrotary-pumpdesignsusedtodayarespur-gear,generated-rotary,sliding-vane,andscrewpump,eachtypehasadvantagesthatmakeitthemostsuitableforagivenapplication.Spur-gearpumps.thesepumpshavetwomatinggearsareturnedinacl

6、oselyfittedcasing.Rotationofonegear,thedrivercausesthesecond,orfollowergear,toturn.thedrivingshaftisusuallyconnectedtotheuppergearofthepump.Whenthepumpisfirststarted,rotationofgearsforcesairoutthecasingandintothedischargepipe.thisremovalofairfromthepumpcasingproducesapart

7、ialvacuumonthepumpinlet,herethefluidistrappedbetweentheteethoftheupperandlowergearsandthepumpcasing.continuedrotationofthegearsforcesthefluidoutofthepumpdischarge.Pressureriseinaspur-gearpumpisproducedbythesqueezingactiononthefluidaditisexpelledfrombetweenthemeshinggearte

8、ethandcasing,.avacuumisformedinthecavitybetweentheteethadunmesh,causingmorefluidtobedrawnintothe