Cooling for a fluid flow machine

Abstract

A fluid flow machine, in particular a steam turbine, is provided having a piston-equalizing line which conducts a vapour from a fresh vapour region of a second flow duct to a thrust-equalizing piston, wherein the surface of the piston-equalizing line is enlarged, and wherein the inner surface of the piston-equalizing line is enlarged.

1 .- 10 . (canceled) 
     
     
         11 . A turbomachine comprising
 a rotor mounted rotatably about an axis of rotation, an inner housing arranged about the rotor and an outer housing arranged about the inner housing,   wherein a first flow region and a second flow region, formed in the opposite flow direction to the first flow region, are arranged between the rotor and the inner housing,   wherein the rotor has a thrust-equalizing piston,   wherein a piston-equalizing line is formed for introducing steam between the inner housing and the thrust-equalizing piston,   wherein the piston-equalizing line outer surface is embodied to be enlarged with respect to a pipe outer surface and/or the piston-equalizing line inner surface is embodied to be enlarged with respect to a pipe inner surface,   wherein outer cooling ribs are arranged on the piston-equalizing line outer surface, and   wherein the outer cooling ribs are arranged in series in the direction of the piston-equalizing line.   
     
     
         12 . The turbomachine as claimed in  claim 11 ,
 wherein the outer cooling ribs are formed as annular disks extending in the radial direction with respect to the direction of the piston-equalizing line.   
     
     
         13 . The turbomachine as claimed in  claim 12 ,
 wherein the annular disks are arranged at regular intervals.   
     
     
         14 . The turbomachine as claimed in  claim 11 ,
 wherein inner cooling ribs are arranged on the piston-equalizing line inner surface.   
     
     
         15 . The turbomachine as claimed in  claim 14 ,
 wherein the inner cooling ribs are arranged in series in the inner circumferential direction.   
     
     
         16 . The turbomachine as claimed in  claim 15 ,
 wherein the inner cooling ribs are embodied as projections extending in the axial direction with respect to the direction of the piston-equalizing line or twisted about the axial direction.   
     
     
         17 . The turbomachine as claimed in  claim 16 ,
 wherein the projections are embodied as disks.   
     
     
         18 . The turbomachine as claimed in  claim 15 ,
 wherein the inner cooling ribs are arranged at regular intervals in the inner circumferential direction.