Inner Housing for a Turbomachine

Abstract

A three-shell steam turbine is provided. The three-shell steam turbine includes an outer housing, an outer inner housing and an inner inner housing, wherein the outer inner housing is arranged around the inner inner housing, in such a way that a cooling steam chamber is formed in between and a flow duct is formed between the outer inner housing and the rotor.

1 - 14 . (canceled) 
     
     
         15 . A turbomachine, comprising:
 a rotor which is mounted such that it rotates about a rotation axis;   an inner inner housing;   an outer inner housing;   an outer housing; and   a flow channel,   wherein the inner inner housing and the outer inner housing are arranged around the rotor,   wherein the outer housing is arranged around the inner and the outer inner housings,   wherein a first flow area for a flow medium to flow in a flow direction is formed between the inner inner housing and the rotor,   wherein a second flow area is formed between the outer inner housing and the rotor downstream from the first flow area, seen in the flow direction,   wherein the outer inner housing is arranged around the inner inner housing only in an area of the first flow area along the rotation axis,   wherein the flow channel, which includes a plurality of rotor blades and stator blades, is formed between the outer inner housing and the rotor, as well as between the inner inner housing and the rotor,   wherein the turbomachine is a twin-flow machine, and   wherein the plurality of stator blades are arranged on the inner inner housing and on the outer inner housing.   
     
     
         16 . The turbomachine as claimed in  claim 15 , wherein a cooling steam area is formed between the inner inner housing and the outer inner housing. 
     
     
         17 . The turbomachine as claimed in  claim 16 , wherein a flow connection is formed between the first and/or second flow areas and the cooling steam area, between the inner inner housing and the outer inner housing. 
     
     
         18 . The turbomachine as claimed in  claim 15 , wherein a cooling steam outlet line, is formed for a cooling medium which is located in the cooling steam area to flow out of the cooling steam area. 
     
     
         19 . The turbomachine as claimed in  claim 15 , wherein the cooling steam outlet line is arranged in the outer inner housing. 
     
     
         20 . The turbomachine as claimed in  claim 19 , wherein the outer inner housing comprises an outer inner housing upper part and an outer inner housing lower part. 
     
     
         21 . The turbomachine as claimed in  claim 20 , wherein the cooling steam outlet line is arranged in the outer inner housing upper part. 
     
     
         22 . The turbomachine as claimed in  claim 20 , wherein the cooling steam outlet line is arranged in the outer inner housing lower part. 
     
     
         23 . The turbomachine as claimed in  claim 15 , wherein the inner inner housing is formed from a nickel-based material. 
     
     
         24 . The turbomachine as claimed in  claim 15 , wherein the inner inner housing is formed from a steel with a high chromium content, which comprises 9-10% by weight of chromium. 
     
     
         25 . The turbomachine as claimed in  claim 24 , wherein the outer inner housing is formed from a material of lesser quality than the inner inner housing. 
     
     
         26 . The turbomachine as claimed in  claim 15 , wherein an apparatus for holding stator blades is provided in the inner inner housing and in the outer inner housing. 
     
     
         27 . The turbomachine as claimed in  claim 26 , wherein the apparatus is in a form of a plurality of grooves. 
     
     
         28 . The turbomachine as claimed in  claim 15 , further comprising an inlet-flow area for fresh steam,
 wherein the inner inner housing is arranged in an area of the inlet-flow area.