Hot gas segment arrangement

Abstract

A hot gas segment arrangement, especially for a combustion chamber of a gas turbine, that includes at least one hot gas segment, which is removably mounted on a carrier, and is subjected at its outside to hot gas and impingement-cooled at its inside, whereby an impingement plate with a plurality of distributed impingement holes is arranged in a distance at the inside of the impingement plate. A cooling air supply means is provided for loading the impingement plate with pressurized cooling air in order to generate through the impingement holes jets of cooling air, which impinge on the inside of the hot gas segment. The cooling efficiency and lifetime are increased by the impingement plate being part of a closed receptacle, which is supplied with the pressurized cooling air, and by the receptacle with the impingement plate being mounted on the carrier independently of the hot gas segment.

1 . A hot gas segment arrangement, especially for a combustion chamber of a gas turbine, comprising at least one hot gas segment, which is removably mounted on a carrier, is subjected at its outside to hot gas, and is impingement-cooled at its inside, whereby an impingement plate with a plurality of distributed impingement holes is arranged in a distance at the inside of said impingement plate, and a cooling air supply means is provided for loading said impingement plate with pressurized cooling air in order to generate through said impingement holes jets of cooling air, which impinge on the inside of said hot gas segment, wherein said impingement plate is part of a closed receptacle, which is supplied with said pressurized cooling air, and that said receptacle with said impingement plate is mounted on said carrier independently of said hot gas segment. 
     
     
         2 . The hot gas segment arrangement according to  claim 1 , wherein said receptacle is composed of said impingement plate and a back plate. 
     
     
         3 . The hot gas segment arrangement according to  claim 1 , wherein said receptacle is mounted on said carrier by means of a hollow stub, and that said pressurized cooling air is introduced into said receptacle through said stub. 
     
     
         4 . The hot gas segment arrangement according to  claim 3 , wherein said receptacle is removably mounted on said carrier. 
     
     
         5 . The hot gas segment arrangement according to  claim 3 , wherein said stub is disposed centrally with respect to said hot gas segment. 
     
     
         6 . The hot gas segment arrangement according to  claim 1 , wherein said hot gas segment encloses said receptacle, that sealing means are provided between said hot gas segment and said carrier in a respective groove, and that said impingement plate or receptacle, respectively, is used to define a sidewall for said sealing means at a low pressure side thereof. 
     
     
         7 . The hot gas segment arrangement according to  claim 6 , wherein said sealing means comprises a rope seal. 
     
     
         8 . The hot gas segment arrangement according to  claim 1 , wherein a plurality of separate hot gas segments are arranged side by side on a carrier, whereby said hot gas segments adjoin each other with parallel sidewalls, that a plurality of grooves is provided on the outside of adjoining sidewalls, whereby the grooves of both sidewalls start within the sidewall area and open into the hot region outside said hot gas segments, and whereby the grooves of both sidewalls pair-wise match with each other, and that each pair of grooves is connected to the interior of one the adjoining hot gas segments by means of a cooling hole. 
     
     
         9 . The hot gas segment arrangement according to  claim 8 , wherein the cooling holes are arranged at the start of the grooves. 
     
     
         10 . The hot gas segment arrangement according to  claim 8 , wherein the cooling holes are arranged alternating on the one and the other of the adjoining hot gas segments.