Spacer for gas turbine blade insert

Abstract

A gas turbine blade has: a main hollow body substantially extending along a longitudinal axis and having a leading edge, a trailing edge, opposite to the leading edge, a suction side, and a pressure side, both comprised between the leading edge and the trailing edge; a hollow cooling element extending along the axis, which is equipped with a plurality of cooling holes and is set within the main body so as to define a gap between the main body and the cooling element; and a rib, which is set within the gap for connecting the main body with the cooling element on the suction side, in an area of the main body without holes for communication between the gap and the outside of the blade.

1 . A gas turbine blade comprising a main hollow body substantially extending along a longitudinal axis and having: a leading edge, a trailing edge, opposite to the leading edge, a suction side, and a pressure side, both comprised between the leading edge and the trailing edge; a hollow cooling element extending along the axis, which is equipped with a plurality of cooling holes and is set within the main body so as to define a gap between the main body and the cooling element; and a rib, which is set within the gap for connecting the main body with the cooling element; the blade being characterized in that the rib is set on the suction side in an area of the main body without holes for communication between the gap and the outside of the blade. 
   
   
       2 . Blade according to  claim 1 , characterized in that the rib is connected throughout its length to the main body and to the cooling element so as to define two chambers of the gap. 
   
   
       3 . Blade according to  claim 1 , characterized in that the rib extends substantially parallel to said longitudinal axis. 
   
   
       4 . Blade according to  claim 1 , characterized in that the rib is defined by an external projection of the cooling element. 
   
   
       5 . Blade according to  claim 4 , characterized in that the cooling element comprises a shaped metal insert closed in a loop, the metal insert being bent so as to define said rib. 
   
   
       6 . Blade according to  claim 5 , characterized in that the metal insert has two terminal flaps bent and coupled to one another to define said rib. 
   
   
       7 . Blade according to  claim 1 , characterized in that the rib is defined by an internal projection of the main body. 
   
   
       8 . Blade according to  claim 1 , characterized in that it comprises a plurality of spacers, which are set in the gap between the main body and the cooling element. 
   
   
       9 . Blade according to  claim 8 , characterized in that the spacers extend substantially orthogonal to the axis. 
   
   
       10 . Blade according to  claim 1 , characterized in that the rib is positioned at a distance from the leading edge, measured externally to the blade along the suction side, comprised between approximately 20% and approximately 40%, and preferably between approximately 25% and approximately 35%, in particular substantially equal to approximately 30%, of the overall distance, again measured externally to the blade along the suction side, between the leading edge and the trailing edge.