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US 8,128,341 B2 9 10 barriercoatingtothesurfacesofthethermallystressedcom ponentsincreasesthee?iciencyoftheeffectivecooling. By the use of the tie-bolt 29, some of the axial forces are absorbed.As aresultofthis,theturbineshaft5canbeformed With thin Walls, Which has a positive effect upon the thermal ?exibility and upon the formation of the radial clearances. The invention is not limited to the formation of a high pressure turbine section as an embodiment of a steam turbine 1, the turbine shaft 5 according to the invention can also be usedinanintermediate-pressureoracompact-turbinesection (high-pressure and intermediate-pressure inside a casing). The turbine shaft 5 can also be used in other types of steam turbine. The invention claimed is: 1.A steamturbineWithacasing,comprising: a rotatably mounted turbine shaft arranged inside the cas ingandalongarotationalaxisoftheturbine,theturbine shaft having a thrust compensating piston, Wherein a ?oWpassageisformedbetWeenthecasingandthetur bineshaft; a cooling line arranged Within the rotor shaft that guides cooling steam in the direction of the rotational axis; an in?oW line connected to the cooling line on one side, that admits an in?oW ofcooling steam from the?oW passage intothecoolingline; an out?oW line connected to the other side of the cooling line,thatguidescoolingsteamontoageneratedsurface ofthethrustcompensatingpiston;and areturnlinearrangedWithinthecasingthatreturnsamix 3.The steamturbineasclaimedinclaim1,Whereinthe turbine shaft in the axial direction has a plurality of sections consistingofdifferentmaterials. 4. The steam turbine as claimed in claim 1, Wherein the turbine shaft in the axial direction has three sections consist ingofdifferentmaterials. 5.The steamturbineasclaimedinclaim4,WhereinthetWo rotor outer sections consist of the same material. 6. The steam turbine as claimed in claim 3, Wherein the sections consisting of different materials are Welded to each other. 7. The steam turbine as claimed in claim 3, Wherein a ?rst section of the plurality of sections is formed as a solid shaft and a second section of the plurality of sections is formed as a holloW shaft. 8. The steam turbine as claimed in claim 3, Wherein the sections consisting of different materials are interconnected by a Hirth toothing. 9.The steamturbineasclaimedinclaim3,Whereinthe 20 sectionsconsistingofdifferentmaterialsareinterconnected 25 by a ?anged connection. 10. The steam turbine as claimed in claim 8 Wherein the in?oW line and the out?oW line are integrated in the Hirth toothing. 11.The steamturbineasclaimedinclaim9,Whereinthe in?oW line and the out?oW line are integrated in the ?anged connection. 12. The steam turbine as claimed in claim 8, Wherein the Hirthtoothinghastrapezoidal,rectangularortriangularser tureofsteamtothe?oWpassage,Whereinthesteam30 rationsWitharecessWhichisformedasanin?oWlineand/or mixture isformed from cooling steam Which ?oWs out ofthe out?ow line, and a portion of a compensating piston leakage steam that ?oWs betWeen the casing and the turbine shaft in the directionofthethrustcompensatingpiston. 2. The steam turbine as claimed in claim 1, Wherein the casing comprises an inner casing and an outer casing. out?oW line. 13. The steam turbine as claimed in claim 12, Wherein the return line is arranged inside the outer casing. 14. The steam turbine as claimed in claim 13, Wherein the 35 returnlineisformedasaboreintheinnercasing.PDF Image | STEAM TURBINE 2001
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