
Unit2AuxiliaryMachineryLesson12MarineBoiler13.1Centrifugalpump13.2Positivedisplacementpump
NewWordsandExpressionscentrifugal[?sentr??fju?ɡl;sen?tr?fj?ɡl]a.离心的shroud[?raud]n.盖板impeller[?mpel?]n.叶轮alignment[??la?nm?nt]n.对中involute[?nv?l(j)u?t]a.渐开线的tolerance[?t?l?r?ns]n.公差arrangement[??re?nd?m?nt]n.布置ejection[??d?ek?n]n.喷射
NewWordsandExpressionsallowance[??la??ns]n.限额volute[v?l(j)u?t]n.蜗壳inducer[?ndju?s?]n.引水泵brass[brɑ?s]n.黄铜kinetic[k??net?k;ka??net?k]a.运动的,动力的vaporization[?ve?p?ra??ze??n]n.蒸发rigidity[r??d??d?ti]n.刚性fixedsealelement静环
NewWordsandExpressionsrotatingsealelement动环idlergear从动轮springcarrier弹簧座grubscrew定位螺钉lanternring挡环glandfollower密封压盖positivedisplacementpump容积式泵whitemetalbush白合金衬
NewWordsandExpressionsrotatingsealelement动环idlergear从动轮springcarrier弹簧座grubscrew定位螺钉lanternring挡环
13.1Centrifugalpump
Apumpisamachineusedtoraiseliquidsfromalowpointtoahighpoint.Alternatively,itmaysimplyprovidetheliquidwithanincreaseinenergyenablingittofloworbuildupapressure.Thepumpingactioncanbeachievedinvariouswaysaccordingtothetypeofpumpemployed.Thearrangementofpipework,theliquidtobepumpedanditspurposewillresultincertainsystemrequirementsorcharacteristicsthatmustbemetbythepump(管路的布置、泵送的液体和使用的目的决定了泵的系统要求和具有的特性).Therearethreemainclassesofpumpinmarineuse:displacement,centrifugalandejection-type.13.1Centrifugalpump
AcrosssectionthroughaverticallymountedcentrifugalpumpisShowninFig.13-1.Waterisledtothesuctioneyeoftherotatingimpeller.Thewatergainsenergybythecentrifugalactionofthepumpandisdischargedtothevoluteoutletcasing(水从旋转叶轮的吸入口进入,并从泵的离心作用下获得能量,然后由蜗壳的排出口排出).Thevoluteiscreatedbyincreasingtheareaoftheoutletportandisgreatestatoutletfromthepump.Bythisdesignthekineticenergyofthewaterisconvertedtopressureenergy.Sealingisprovidedb
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