Screw cooling for a fluid flow machine

Abstract

A fluid flow machine is provided having a housing composed of a housing upper part and a housing lower part, wherein the housing upper part is connected to the housing lower part via a pin screw and has a cooling duct which is connected, on the one hand, to the flow duct with a vapour at a relative high pressure and, on the other hand, to a cooling duct outlet which is connected to the exhaust steam space.

1 - 6 . (canceled) 
     
     
         7 . A turbomachine comprising:
 a housing having an upper housing part, a lower housing part and a flow duct arranged in the housing,   wherein the flow duct has a flow duct exhaust steam space,   wherein the upper housing part is connected to the lower housing part by bolts,   wherein the bolt is configured as a stud bolt and has a cooling duct along the axial direction of the stud bolt,   wherein the cooling duct has a cooling duct inlet and a cooling duct outlet,   wherein the cooling duct inlet is fluidically connected to the flow duct,   wherein the cooling duct outlet is fluidically connected to the flow duct exhaust steam space via a bolt cooling duct arranged between the stud bolt and the housing,   wherein the stud bolt comprises a nut,   wherein the nut comprises cooling duct slots which fluidically connect the cooling duct to the flow duct exhaust steam space,   wherein the nut has a thread and the cooling duct slot is arranged in the region of the thread.   
     
     
         8 . The turbomachine as claimed in  claim 7 ,
 wherein the lower housing part has a bore which connects the cooling duct inlet to the flow duct.   
     
     
         9 . The turbomachine as claimed in  claim 7 ,
 wherein the cooling duct inlet is arranged in the lower housing part.   
     
     
         10 . The turbomachine as claimed in  claim 7 ,
 wherein the cooling duct outlet is arranged in the upper housing part.   
     
     
         11 . The turbomachine as claimed in  claim 7 ,
 wherein the turbomachine is configured as a steam turbine.