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Patented May 23, 1933 1,910,845 ‘UNITED STATES PATENT OFFICE ALF LYSHOLM, OF STOCKHOLM, SWEDEN, ASSIGNOR 'IlOAKTIEBOLAGEI‘ LJ'UNGSTROMS ANGTUBBIN, OF .STOCKHOLM, SWEDEN, A JOINT-STOCK COMPANY RADIAL rLow TURBINE Application ?led~November 14, 1930, Serial No. 495,624, and In Sweden December 10, 1.929. The present invention relates to radial tion, reference may be had to the accom ?owvelastic ?uid turbines adapted to oper .ateagainstbackpressureandprovidedwith tionembodiedinaturbinehavingacasing a turbine casing immediately surrounding providing a single outlet for motive ?uid. theradialflowbladesystem,saidcasingpro viding one or more spiral or volute shaped exhaustchambersextendingaroundthefull periphery of the outer blade ring of the turbine. ' - 10 steam is exhausted from the radially outer mostbladeringinaradialdirection,and thisdirectionofdischargecauseslossesdue actorofthe?uiddischargedfromtheouter to turbulence and the formation of eddies, blade ring of the turbine. , . ' Inpriorformsofradial.?owturbines, throughthecenteroftheturbine,partsbe 60 15 becauseofthenecessityofsharplyaltering Referring now more particularly to Fig. 66 thedirectionofflowof-the?uid‘afterithas, 1,referencecharacters1and2designatethe beendischargedintotheturbinecasingfrom oppositelyrotatingshaftsofadoublerotary thelastrowofturbineblades. Undersuch formofturbineoftheknownLjungstrom circumstances, the pressure in the turbine type. Steam is supplied to the turbines 20 exhaustlinemustbeconsiderablylowerthan throughconduit3and?owsthroughthem 70 the discharge pressure from the turbine blad ing, if ?ow of exhaust ?uid from the tur let chambers 4 and channels 5 in the tur bine rotors to the radial ?ow blade system bineistobee?'ected. Thispressurediffer .7oftheturbinefromwhichitisdischarged ence between the point where steam is ex-v to the outlet chamber 8. The outlet cham 25 haustedfromtheturbinebladesandwhere ber8ispreferablydisposedwithinanouter75 itisavailableforuseatalowerpressure turbine'casing9andisformedbythevol stage represents an energy loss which is pro duced largely‘at the moment when the m0 ute shaped casing member 10, which in ~the illustrated embodiment extends around the tive ?uid leaves the last blade row of the entire circumference of the blade system of 80 turbine. A principalobjectofthe resent theturbine. v80 As shown in Fig. 2, the casing 10 prefer abovecharacterinradial?owbackpressure ablyconsistsoftwoparts,100:and10b,se turbines,andthisandotherobjects,aswill curedtoeachotherinanysuitablemanner, hereinafter be more fully pointed out, are as by means of ?anges 11 and 12 adapted 86 attainedbytheprovisionofnovelblading tobeboltedtogether. 86 steamavelocitycomponentinthedirection tothe?anges14onthestationarymembers oftheoutletoroutletsoftheturbinecasing. 13. Thesebolts-mayadvantageouslybein This construction, when combined with a the form of through bolts, as indicated in 90 casingofspiralorvoluteformproviding Fig.1,thecentralportionsoftheboltspass increasing ?ow area toward the outlet or ing transversely though the chamber 8. invention is to reduce exhaust losses of the in the last row of turbine blades, which The casing 10 is held in position by means blading is designed to give to the leaving of suitable bolts 15 which secure the casing ’ outlets of the casing, provides an arrange These central portions, shown in section in 45 mentsuchthatthelossesduetoturbulent Fig.2,arepreferablyofstreamlined_cross ?owandlikefactorsaresubstantiallyelimi sectionandarrangedsoastoassist1ndi 95 nated and a pressure at the outlet of the rectingthesteamdischargedfromtheblade turbineismaintainedwhichissubstantially systemtowardtheoutlet. equal to the pressure at the outlet of the '00lastoroutermostbladerowoftheturbine. peripheryofthevolutecasing10isar As will be apparent from Fig. 2,the outer Forabetterunderstandingoftheinven ranged,withrespecttotheouterbladering panying drawings illustrating the inven In the drawings: _ 65 Fig.1isalon itudinalcentralsectionof aradialflowturiineembodyingtheinven~ tion; Fig. 2' is a transverse section taken ing omitted for the sake of clearness; and, ' Fig.3isadiagramillustratingthecharPDF Image | LYSHOLM Radial Flow Turbine
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