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US 2013/0142638A1 Jun.6,2013 RADIAL FLOW STEAM TURBINE TECHNICAL FIELD [0001] Thisinventionrelatestoasteamturbine,andpar ticularlyrelatestoaradial?oW steamturbineinWhichthe operating steam travels in an out?ow direction, that is the radialdirectionperpendiculartotherotationshaft. BACKGROUND ART rotordiskandtherotorbladesattachedtotheotherrotordisk (see FIG. 7 of this application) [0005] Priorart1:Tokkai2005-105854JP [0006] Priorart2:Tokkai2006-144758JP [0007] Priorart3:Tokkai2005-042567JP [0008] Priorart4:Us.Pat.No.5,071,312 [0009] Priorart5:Us.Pat.No.7,244,095 DISCLOSURE OF THE INVENTION The Problems to be Solved [0002] Asteamturbineoperatedbythedilatationalenergy of the expanding steam is commonly used for supplying electric poWer all over the World. For enhancing the turbine e?iciency,theoperationsteamtemperatureandtheoperating ingrotordisksrotatingintheclockWiseandthecounterclock steam pressure become higher and the scale of the plant becomes larger.Insome cases,thesteamturbineiscombined With a gas turbine for achieving the combined steam circle. Ontheotherhand,therecyclingoftheWastedheatisrequired forreducingthecarbon-dioxide.ExamplesoftheWastedheat aretheWastedheatfromthedieselengineinships,theWasted heat from the process operation in factories, and the Wasted heat from garbage disposal facilities. It is desired to convert thoseWastedheatenergyintoavailableelectricenergy.HoW ever,itisnotachievedsimplybyscalingdoWnthelargescale steamturbinesuchasforthepoWerplant,sincethee?iciency Will be deteriorated. Therefore the appropriate small scale steam turbine is required corresponding to the demand for smallscaleelectricitygeneration. Wise respectively by utiliZing the aerial bounce, and the tWo facingrotationshaftshavingtherotordiskatthefrontedge (Priorart1and2).Thereisanothertypeoftheconventional radial?oW steamturbinethatincludesastatordiskonWhich a cluster of stator blades are mounted, a rotor disk on Which a cluster of rotor blades are mounted, and a rotation shaft on Which the rotor disk is ?xed (Prior art 4 and 5). The basic structureoftheradial?oW steamturbineinthesepriorart1 and 2 can employ only one rotor disk ?xed to the rotation shaft. By this reason, there is a limitation on obtaining large poWer output. [0011] Thepriorart3and4,inordertosolvetheabove mentioned problem, includes rotor blades mounted on the bothsidesurfaceoftherotordisk,thesteampassagesalongto theradial?oWdirectionareformedonthebothsidesurfaces steam supply to each steam passage formed in the radial out?oW directionamong pluraldisksinthosepriorart1to4. In order to solve this problem, steam is supplied by the axial steam passage formed through the rotation shaft, the steam goesthroughtherotationshaftandbenttothesteampassage formed on the both sides of rotor disks in the radial out?oW directionviasmallholesopenedformedinthepipeWallofthe rotation shaft. HoWever, by this method, another problem occurs With the rotation shaft due to its heat expansion because of the hot and high pressure steam. Moreover, there is a serious actual problem that the amount of the supplied steam is limited by the small siZe holes, so the amount of the suppliedsteamisnotenoughforthesteampassagetobereach to the radial out?oW via the small holes on the limited diam eterandthelimitedsurfaceoftherotationshaft.As aresult,a suf?cientamountofoutputcannotbeobtained.Inaddition,it is dif?cult to manufacture such a turbine, and the manufac turing cost Will be high, so ithas not become popular in the actual industrial use. [0003] Thepriorsteamturbineingeneralconvertsthedila tationalenergyoftheexpandingsteamintotherotarymotion oftherotordisk,andthepluralrotordisksareinstalledtothe byutiliZingthepressuredifferencealongtotherotationshaft rotationshaft. bysupplyingthesteamsoastokeepthesteampressureatthe [0012] HoWever,thereisaproblemofhoWtosecurethe turbine input terminal high and the steam pressure at the turbine output terminal loW. For this reason, the axial ?oW turbineinWhichthedirectionofthesteamHow isparallelto therotationshafthasbeendevelopedandhasbeenup-scaled corresponding to the demand for large scale poWer plants. Besidestheaxial?oW turbine,theradial?oW turbineutiliZing the steam pressure difference along the radial direction per pendicular to the rotation shaft, in other Words, the out?oW direction, is knoWn in the prior art. The radial ?oW steam turbine is suitable for the small scale type turbine and is a relatively high ef?ciency turbine. HoWever it is not suitable for the large scale type turbine, so ithad faded aWay from the market use. HoWever, it is being reconsidered once again from the necessity ofthe demand forre-use ofthe small scale industrial Wasted heat energy. The typical example of the radial?oW steamturbineisaLjungstromturbine(priorart1, 2 and 3). [0004] ThecharacteristicoftheLjungstromturbine(FIG.3 shoWn in the prior art 1) representing the conventional radial ?oWsteamturbine,Whichisthecommonbasetechnologyof [0013] Moreover,theamountofthesurfaceareaforsteam the listed prior art, is that tWo facing rotor disks are attached respectively to the front edge of tWo facing rotation shafts, andthesteam?oW passesfromthecenterparttotheouterpart in the out?oW radial direction formed betWeen these facing tWo rotordisks.The clusteroftherotorblades aremounted on each surface of the facing tWo rotor disks respectively. The rotor blades are arrayed annularly on concentric paths, each set of the rotor blades is arrayed on the surface of the facing tWo rotor disks respectively in the radial direction in order to rotate the one disk in the clockWise direction and the other diskinthecounterclockWisedirectionbyutiliZingtheaerial [0014] Therefore,inordertoincreasetheoutputofthe bouncegeneratedbetWeentherotorbladesattachedtotheone radial ?oW steam turbine, the rotor blades and the stator [0010] TheaboveconventionalLjungstromturbineasthe conventionalradial?oW steamturbineincludesthetWofac ?oW throughthegapbetWeentherotordiskandstatordiskis almost the same even ifthe amount ofthe surface area ofthe rotor blades is increased or decreased. Regarding the ratio of the amount of the surface area of the rotor blades and the amount of the surface area of the gap for the steam to be ?oWed, the amount of the surface area of the rotor blades shouldberelativelylargeenough.Inthepriorart3,thesmall rotor blades are employed, so the steam leakage loss Will be large.As aresult,itisnotsuitablefortheactualuseevenifthe number of the rotor disks is increased.PDF Image | RADIAL FLOW STEAM TURBINE
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