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US 6,227,799 B1 78 dividing the steam ?oW into the tWo ?oWs of the intermediate-pressure turbine section 25 and also to prevent direct contact of the hot steam With the turbine shaft 1. The turbine shaft 1 has in the intermediate-pressure turbine section 25 a second blading region 31 having the intermediate-pressure moving blades 11, 14. The hot steam ?oWing through the second blading region 31 ?oWs out of the intermediate-pressure turbine section 25 from an out?oW connection 26 to a loW-pressure turbine section (not shoWn) ?uidically connected doWnstream. 10 tothecavity34.Duringoperationoftheturbineshaft1,the cavity 34 is ?lled With cooling steam 6, Which brings about heat insulation betWeen the turbine-shaft material 35 and the cooling steam 6 ?oWing permanently through the cooling line 5. This ensures that heating of the bearing 29b during the operation of the turbine shaft 1 is kept at a loW level. The invention is distinguished by a turbine shaft Which has a cooling line via Which there is connected at least one in?oW line to a high-pressure turbine section and at least via one out?oW line to the steam-in?oW region of the intermediate-pressure turbine section. The in?oW line, the cooling line, and the out?oW line form a line system in the interior of the turbine shaft, through Which line system “cold” steam can be passed from the high-pressure turbine sectiontothethermo-mechanicallyhighlystressedsteam in?oWregionoftheintermediate-pressureturbinesection.In this Way, both the moving blades, in particular the moving blade roots, and the circumferential surface of the turbine shaftintheespeciallyhighlystressedsteam-in?oWregionof the intermediate-pressure turbine section, Which is in par ticular of double-?oW construction, are cooled Without a high construction cost. In a bearing region betWeen the high-pressure turbine section and the intermediate-pressure turbine section, heat insulation is provided in the interior of theturbineshaft,byWhichheatinsulation,eXcessiveheating of a bearing of the turbine shaft is avoided. We claim: 1. A turbine shaft for a steam turbine having a rotation aXis,comprising: a ?rst blading region of a ?rst turbine section disposed alongtherotationaxis; a second blading region of a second turbine section disposed along the rotation aXis, Wherein said second blading region has recesses formed therein for accom modatingturbinemovingblades; a bearing region disposed betWeen said ?rst blading regionandsaidsecondbladingregion,said?rstblading region, said second blading region and said bearing region together de?ning an interior therein functioning as a cooling line for passing cooling steam in a direc tion of the rotation aXis and together de?ning a cir cumferentialsurface; at least one out?oW line connected to said cooling line for discharging the cooling steam said at least one out?oW lineleadingouttosaidcircumferentialsurfacebetWeen tWo of said recesses being aXially spaced-apart recesses; and at least one in?oW line connected to said cooling line for supplying an in?oW of the cooling steam, the cooling steam cooling highly temperature-loaded regions of said bearing region and said ?rst and second blading regions. 2. The turbine shaft according to claim 1, including a heat insulationdisposedinsaidbearingregionaroundsaidcool ing line for reducing a radial heat ?oW. 3. The turbine shaft according to claim 2, Wherein said bearing region has a bearing Wall, and said heat insulation has a recess formed therein de?ning a cavity formed betWeen said heat insulation and said bearing Wall. 4. The turbine shaft according to claim 3, Wherein said heat insulation is an insulating tube. 5. The turbine shaft according to claim 4, Wherein said insulating tube has at least one opening formed therein leadingtosaidcavity. 6. The turbine shaft according to claim 1, Wherein said ?rst and second blading regions serve to accommodate The turbine shaft 1 is composed of tWo turbine shaft sections 1a and 1b, Which are ?rmly connected to one another in the region of the bearing 29b. Each of the turbine shaft sections 1a, 1b has a cooling line 5 con?gured as a centralbore5alongtherotationaXis2.Thecoolingline5 15 is connected to the steam-discharge region 16 via an in?oW line 8 having radial bores 8a. In the intermediate-pressure turbine section 25, the coolant line 5 is connected to a cavity (not shoWn in any more detail) beloW the shaft screen 9. The in?oW lines 8 are made as radial bores 8a, as a result of Which “cold” steam can ?oW from the high-pressure turbine section 23 into the central bore 5. Via an out?oW line 7, Which is also con?gured in particular as a radially directed bore 7a, the steam passes through the bearing region 32 into theintermediate-pressureturbinesection25andreachesthe 25 circumferential surface 3 of the turbine shaft 1 there in the steam-in?oW region 15. The steam 6 ?oWing through the cooling line 5 has a markedly loWer temperature than the reheated steam ?oWing into the steam-in?oW region 15, so that effective cooling of the ?rst moving-blade roWs 14 of the intermediate-pressure turbine section 25 as Well as of the circumferential surface 3 in the region of the moving-blade roWs 14 is ensured. FIG. 2 shoWs a detail of the steam-in?oW region 15 of the intermediate-pressure turbine section 25 on an enlarged 35 scale. Corresponding moving blades 11, 14 are in each case disposed With their respective blade roots 18 in recesses 10 of the turbine shaft 1. The recesses 10 each have passages 20 around the blade roots 18, the passages 20 being connected, on the one hand, to the out?oW line 7, Which runs radially relative to the rotation aXis 2 and, on the other hand, to one branch line 12 each. The branch line 12 leads from the recess 10 to the circumferential surface 3 and faces a guide blade 19 of the steam turbine. The steam 6 ?oWing out of the out?oWlines7passesintothepassages20oftherecess10 45 and thus cools the blade roots 18, Which are each disposed in a corresponding recess. The steam 6 ?oWs from the passages 20 through a respective branch line 12 to the circumferential surface 3 of the turbine shaft 1 and thus also cools the circumferential surface 3 betWeen moving blades 11 adjacent to one another in the direction of the rotation aXis 2. At a moving blade 11 Which has a blade cooling line 38, steam 6 likeWise ?oWs through the blade cooling line 38 and cools the moving blade 11 from inside out. This is shoWnschematicallyatonemovingblade11.FIG.3shoWs 55 a detail of the bearing region 32 of the turbine shaft section 1b of the high-pressure turbine section 23. In the bearing region 32, the cooling line 5 is Widened to a larger diameter along a predetermined aXial length. Heat insulation 33, formed of an insulating tube 36, is put into the cooling line 5 Which is thus Widened. The insulating tube 36 has an inside diameterthatcorrespondstothediameterofthecoolingline 5 that is not Widened. The outside diameter of the insulating tube 36 is smaller than the enlarged diameter of the cooling line5,sothatacavity34,inparticularanannulargap34, 65 remains betWeen the insulating tube 36 and the turbine-shaft material 35. The insulating tube 36 has openings 37 leadingPDF Image | TURBINE SHAFT OF A STEAMTURBINE HAVING INTERNAL COOLING
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