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US 2013/0142638A1 Jun.6,2013 radial ?oW steam turbine 100 of the present invention includes at least one rotor disk, rotor blades mounted on both side surfaces of the rotor disk respectively, the stator disks installed corresponding to both sides of each rotor disk respectively,sothatatleasttWo operatingsteam?oW passage portions are formed. In the con?guration shoWn in FIG. 1, there are four rotor disks 20, ?ve stator disks 30, and eight operating steam ?oW passage portions 50. [0062] Next,theoperatingsteampressureadjustingholes 51 isdescribed. [0063] Inthecon?gurationshoWninFIG.1,therearefour rotor disks 20, ?ve stator disks 30, and eight operating steam ?oW passageportions50.Inthiscon?guration,thereisno air pressure difference among the steam ?oW passages 50 becausetherearesteamsupplyroutesinthevicinityofthe rotation shaft on each rotor disks 20 respectively through the axisdirection.HoWever,Whenthenumberofthestagesofthe operating steam ?oW passage portions 50 become larges, unevensteamexpansionmay occurinthestagesaccordingto the condition such as the amount of the steam volume sup plied from the steam supply source being unstable. Ifthe operating steam volume becomes large quickly by the rapid expansion ofthe supplied steam, not althe supplied steam passes through the gap betWeen the rotor blades 21 and the statorblades 31 smoothly. In this case, the steam How to the out?oW directionisblockedandthesteam?oW decelerates. As shoWnabove,theairpressuredifferenceoccursamongthe steam ?oW passages portions 50, Which deteriorates the safe operation. [0064] Inthiscon?guration,theoperatingsteampressure adjusting holes 51 are formed on the rotor disk 20 and the statordisk30 appropriatelyinordertoadjusttheairpressure difference among the steam ?oW passages portions 50 by connecting these steam ?oW passages portions 50 in addition tothesteamsupplyroute.When theairpressuredifference occurs among the steam ?oW passages portions 50, the steam pressure can be adjusted among the steam ?oW passages portions50viatheoperatingsteampressureadjustingholes 51.Thereforetheradial?oW steamturbine100caneasethe rapid increase or decrease ofthe steam ?oW volume appro priately, and the steam stuf?ng problem can be avoided. [0065] Next,thesteamHowisdescribed. [0066] FIG.4isa?gureshoWingthesteam?oWsuperim posed onto the con?guration shoWn in the FIG. 1. [0067] Thesteamgeneratedinthesteamsupplysource(itis notshoWnin?gures)isintroducedfromthesteam?oW input openings41.Inthiscon?guration,thesteam?oW inputopen ings 41 are formed on both sides ofthe casing 40, the steam is suppliedfrombothsidesintothecasing40. [0068] Theintroducedsteamgoestotherotordisk20along to the rotation shaft 10, then the steam goes through the through opening 22 on the rotor disk 20, and passes through the steam supply route formed by the steam passage portion 31 on the stator disk 30. Then the steam ?oWs in the axial direction in the vicinity of the rotor disk 10 along to the rotation shaft 10. The steam ?oWing inthe steam supply route ?oWs intheaxisdirection,thenreacheseachoperatingsteam ?oW passage portion 50 and bend and ?oWs into each oper ating steam ?oW passage portion 50. [0069] Theoperatingsteam?oWingintoeachoperating steam ?oW passage portion 50 inthe out?oW radial direction expands and runs through each statorblade 31 and each rotor blade21 athighspeed.The steamgivestherotationenergyto each rotor blade 21, and the rotor blades 20 and the rotation shaft10rotatetogether.Inthiscon?guration,thesteamgoes through both side surfaces of the rotor disk 20, the steam passes through each stage of the stator blades 31 and the rotor blades 21 according to the air pressure difference along the radial direction, and the steam gives the rotation energy to eachrotorblade21Whilepassingthroughtheoperatingsteam ?oW passageportion50. [0070] In this con?guration, the rotor blades 21 are mountedonbothsidesurfacesoftherotordisk20andthe operating steam ?oW passage portions 50 are formed on both sidesurfaceoftherotordisk20.Thus,abouttWicetherotation torque can be obtained compared With the case of the con ?guration in Which the rotor blades 21 are mounted on single sidesurface. [0071] Intheconventionalradial?oWsteamturbineshoWn in FIG. 7, the corresponding operating steam ?oW passage portionrunningthroughthestagesofthestatorbladesandthe rotor blades can be formed as only one, so the utiliZed oper ating steam ?oW passage portion is only one. On the other hand,regardingtheradial?oW steamturbineofthepresent invention, the con?guration shoWn in FIG. 4 can form and utiliZed eight operating steam ?oW passage portions in the out?oW direction, and the output can be enhanced. Embodiment 2 [0072] Embodiment2describestheexampleoftheradial ?oW steamturbineinWhichthereisasinglestageoftherotor blades 21 arrayed annularly and a single stage of the stator blades 31 arrayed annularly. The merit of the single stage is that the safe operation is possible When the steam pressure supplied from the steam supply source is not large enough. [0073] FIG.5(a)shoWstheexampleinWhichtWorotor disks 20 are installed on the rotation shaft 10 and three stator disks 30 are installed. The single stage of the rotor blades 21 is mounted on the rotor disk 20, and the single stage of the statorblades31 ismountedonthestatordisk30,sotheunitis formed as a single stage. The number ofthe rotor disk 20 and the stator disk 30 can be modi?ed corresponding to the amount of steam supplied from the steam supply source. [0074] AsshoWninFIG.5(b),intheoperationofthesingle stageoftheradial?oW steamturbine,thesameasEmbodi ment 1,thesteamgeneratedinthesteamsupplysource(itis notshoWnin?gures)isintroducedfromthesteam?oW input openings 41. The introduced steam goes to the rotor disk 20 alongtotherotationshaft10,thenthesteamgoesthroughthe opening portion 21 on the rotor disk 20, and passes through the steam supply route formed by the steam passage portion 32 on the stator disk 30, then the steam ?oWs in the axial directioninthevicinityoftherotordisk20alongtherotation shaft10.Thesteam?oWinginthesteamsupplyroute?oWsin the axis direction, then reaches each operating steam ?oW passage portion 50 and bends and ?oWs into each operating steam?oW passageportion50.Inthiscon?guration,therotor blade 21 and stator blade 31 compose a single stage, the suppliedsteamisnotrequiredtobehightemperatureandhigh pressure.Iftheamountofthesuppliedsteamislargeenough, the rotor disk 20 and the stator disk 30 are provided in multi stage. The same as Embodiment l, a large amount of steam canbesuppliedenoughviathethroughopening22formedon therotordisk20andthesteam?oWportion32formedonthe stator disk 30. [0075] AsshoWnthisEmbodiment2,ifthesteamsupplied from the steam supply source such as a boiler is not enough high temperature and high pressure, the radial ?oW steamPDF Image | RADIAL FLOW STEAM TURBINE
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