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Patentedoct.22,-1940 _2,218,957l STATI-:s"PATENT"OFFICE Application August 1, 1938,v Serial N o. 222,469 In Sweden August` 19, 19,37' a. i3Claims. (Cl.253-165)l invention relates to double rotation tur system will be displaced towards the said ñrst- f binesforelasticfluid,hereinafter-forthesakeof mentionedsìde.,-Asaresult,thelow’pressuresys simplicity-referredtoassteam,oftheradialflow temwillobtainamorecentral’positionwithrela typeinwhichtherearetwoormoreaxially tiontotheturbinebearingsVandtheturbinecas `spacedgroup's‘ofconcentricbladings`whichare ing.Thiswillaffordseveraladvantages,such-as passedinf»seriesbythesteamsothatthegroup substantiallyequaldistancesbetweenthecenters offblladings-tobefirstpassedbythesteamandthe ofgravityofthe‘twooppositelyrotating.turbine group»~tobelastpassed-*bythesteamareactuated halvesandtherespective-bearingcenters,nearly atoppositeendsof'>the'turbine; I-Ii-therto,itwas equaldeiiections4ofïtheshaftends,yand*much 10Icommonpracticeto-admitysteamtothe'saidñrst thelsamecriticalnumberlofrevolutions`forlboth 10 mentionedgroupof'bladings,thatis,thehigh turbinehalves.Furthermore,thesteamd-is pressuresystemoftheturbine,>from~asteam chargedfromthelow.pressuresystem-willflow chestlocatedatthesameend'ofYthelturbine outinto.thecentralportionofthesurrounding wher'efthesaidgroupofbladingswassituated. turbinecasingywherebyyamplespacewillbeavail ll:Thismethodofsupplyingthedrivingiiuidmay ableyforthelaterallyexpandingflowofsteamas15 easilybefound,lasthereisonlyneedofthose comparedwiththespaceavailableforsaid;-steam channelslinthevturbinediscwhichareordinarily inc-theVhithertoknownmultiplediscturbines.in providedgvinconnectionwithdoublerotation whichthelowpressuresystem_is-situatedonone turbines in order'to effect a communication be side.of the.turbine casing. ' 20'tweenthesteamchestandtheinnermostportion Y''Asarule,thesteamchestisconcentricallysur of`the-saidgroupof>bladings,thatis,thevhigh roundedbyoneormoreadditionalsteamcham pressure system. cIn certainv turbine types, how bers for supplying overload steam. With the ever,suchas,'-forinstance,condensingturbines, steamchambersarrangedinconformitywiththe thekgroupofbladingssituated'attheendofthe `presentinvention,ahigheroverloadingcapacity 25. series, that is, the low pressure system, is of a i may-be: obtained due to the fact that fresh steam comparatively-large diameter- and is, therefore' may be>-supplied directly to the low pressure considerablyheavierthantheothergroupof bladings'for-eachfofvtheothergroupsofbladings. Thedistancebetweenthecentersofgravityofthe system..Previous1-y,this>wasfpossible-onlybypro vidingsteamchestsonbothsidesoftheturbine. This,too,meansaconsiderableadvantageofthe present invention. 30 ’The above described construction effects a good balancingoftheturbineinaxialdirectiondue to the fact that the labyrinth packing on the 30 two rotary turbine halves and the centers of the respective bearings will be quite different due totheunsymmetricalpositionoftheheavierlow pressure system. As a result, the deflections of theshaftendswillbeunequalandtheturbine ’lowpressuresideisincommunicationwiththe 35halveswillobtaindifferentcriticalnumbersof revolutions. The object of this invention is to provide a tur bine of the type above set forth, hereinafter re ferredtoasamultiplediscturbine,inwhichthe steamchestforthefreshsteamandisthusfed35 with steam of high pressure. With the steam chest situated on the high pressure side, the balancing steam has to be admitted to the laby- ' rinthpackingonthelowpressuresidethrough 40 low pressure system is situated substantially -in pipe lines extending from the steam chest. The 40 inventionrendersthisarrangementunnecessary andmakestheconstructionmoresimple. In the drawing, rone embodiment of a turbine constructed according to this invention is illus trated in a diagrammatic manner. The drawing 45 shows an axial section of the upper portion of theturbine. 50highpressuresystemsituatedontheotherside centricbladingswhicharepassedbythesteamin50 oftheturbinebeingprovidedbypassagesformed succession. ThenumeralsIand2indicatethe intherotaryturbinehalfnextt0thesteamchest. endsofthetwoshaftsotherwisenotillustrated. «Bymovinginthiswaythesteamchestfromthe 'I‘heshaftendIcarriestwoturbinediscs3and`4. sidewhereithashithertobeenpositionedtothe Theshaftend2carrieslikewisetwoturbinediscs 45 The invention is characterized, chiefly, by the fact that the steam chest of the multiple disc tur bineissituatedonthesideoftheturbine,where the low pressure system is situated, a connection forpassingsteamfromthissteamchesttothe providedwiththreeaxiallyspacedgroupsofcon themiddleoftheturbineandinwhichthe centersofgravity0fthetwooppositelyrotating turbine halves are situated at about equal dis tances from their respective bearing centers. 55 oppositesideoftheturbine,theinner>turbine 5and6,thelatterofwhichbeingsoconstructed55 With reference to the drawing, the turbine isPDF Image | RADIAL FLOW ELASTIG FLUID TURBINE
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