Inner housing hub for a gas turbine

Abstract

An inner housing hub is arranged in a gas turbine about a gas turbine shaft and is formed as a component of an inner housing used to deflect hot gases exiting combustion chambers towards a turbine inlet region arranged in the direction of the gas turbine shaft. The inner housing hub includes at least one substantially cylinder casing-shaped securing portion having a cylinder casing-shaped main part, which has a hot side facing a hot gas path and a cold side facing away from the hot gas path. At least one web-shaped protrusion extends along the cold side and is arranged on the cold side on the main part in order to secure the inner housing hub. The web-shaped protrusion is made of a first material and the main part is made of a second material, the first material having a greater thermal expansion coefficient than the second material.

1 . An inner housing hub for a gas turbine, wherein the inner housing hub can be arranged in the gas turbine around a gas turbine shaft and is designed as a component of an inner housing, wherein the inner housing hub together with the inner housing is used to deflect hot gases exiting combustion chambers toward a turbine inlet region arranged in the direction of the gas turbine shaft, comprising:
 at least one fastening portion substantially in the form of a cylindrical shell having a main body in the form of a cylindrical shell, which comprises a hot side facing a hot gas path and a cold side facing away from the hot gas path,   at least one web-shaped projection that extends along the cold side and is arranged on the cold side of the main body to enable the inner housing hub to be fastened,   wherein the web-shaped projection comprises a first material and the main body comprises a second material, wherein the first material has a greater thermal expansion coefficient than the second material,   such that, in at least one operating state of the gas turbine, the thermally induced stresses are reduced in the region of the fastening portion in comparison with an integral design of the main body and the web-shaped projection made of the second material.   
     
     
         2 . The inner housing hub as claimed in  claim 1 ,
 wherein for the fastening of the inner housing hub in the gas turbine, said hub can be fastened on a fastening component in such a way that the web-shaped projection can be arranged in a slot surrounded by the fastening component.   
     
     
         3 . The inner housing hub as claimed in  claim 1 ,
 wherein the fastening portion is a housing wall, which is arranged around a center line and around which the hot gas path flows, with the result that the hot side faces away from the center line.   
     
     
         4 . The inner housing hub as claimed in  claim 1 ,
 wherein the inner housing hub is designed substantially in the form of a cylindrical shell, at least in the region of the fastening portion, and the at least one web-shaped projection is arranged on the main body along a circular circumferential line, such that a web which is continuous or divided into segments or is in the form of a discontinuous ring is arranged on the cold side.   
     
     
         5 . The inner housing hub as claimed in  claim 1 ,
 wherein the inner housing hub can be arranged with one end in a turbine inlet region, wherein the fastening portion is arranged in the region of the end.   
     
     
         6 . An inner housing comprising:
 an inner housing hub,   wherein the inner housing hub is designed as claimed in  claim 1 .   
     
     
         7 . A gas turbine, comprising:
 an inner housing as claimed in  claim 6 .