Tip shroud attachment for stator vane

Abstract

A stator vane segment and tip shroud segment assembly comprising: a plurality of vanes, each having an airfoil portion and a radially inner tip, each tip formed with at least one radially inwardly projecting tenon; and a tip shroud segment extending over the radially inner tips of the vanes, the tip shroud segment formed with a plurality of holes, each hole fitted with a bushing that receives a respective one of the tenons.

1 . A stator vane segment and tip shroud segment assembly comprising: 
 a plurality of vanes, each having an airfoil portion and a radially inner tip, each tip formed with at least one radially inwardly projecting tenon; and    a tip shroud segment extending over the radially inner tips of the vanes, said tip shroud segment formed with a plurality of holes, each hole fitted with a bushing that receives a respective one of said tenons.    
   
   
       2 . The assembly of  claim 1  wherein said tenons are attached directly to said bushings.  
   
   
       3 . The assembly of  claim 1  wherein said bushing is formed with an internal shoulder on which the respective tenon is seated.  
   
   
       4 . The assembly of  claim 1  wherein each bushing is recessed relative to a radially innermost surface of said tip shroud segment such that said bushing does not protrude into a flowpath along the airfoil portions of the vanes.  
   
   
       5 . The assembly of  claim 3  wherein each bushing is recessed relative to a radially innermost surface of said tip shroud segment such that said bushing does not protrude into a flowpath along the airfoil portions of the vanes.  
   
   
       6 . The assembly of  claim 1  wherein each bushing is formed with an external shoulder engaged by said tip shroud segment.  
   
   
       7 . The assembly of  claim 3  wherein each bushing is formed with an external shoulder engaged by said tip shroud segment.  
   
   
       8 . The assembly of  claim 1  wherein each bushing is formed with a center hole counterbored to provide an internal shoulder that provides a seat for the respective tenon and wherein said tenon is welded to said bushing at said internal shoulder.  
   
   
       9 . The assembly of  claim 2  wherein said bushings are not otherwise attached to said tip shroud segment.  
   
   
       10 . The assembly of  claim 1  wherein said tenons are welded to said bushings.  
   
   
       11 . A stator vane segment and tip shroud segment assembly comprising: 
 a plurality of vanes, each having an airfoil portion and a radially inner tip each tip formed with at least one radially inwardly projecting tenon;    a tip shroud segment extending over the radially inner tips of the vanes; said tip shroud segment formed with a plurality of holes, each hole fitted with a bushing that receives a respective one of said tenons;    wherein said bushing is formed with an internal shoulder on which the respective tenon is seated; and    wherein each bushing is formed with an external shoulder engaged by said tip shroud segment.    
   
   
       12 . The assembly of  claim 10  wherein said tenons are fixed to said bushings.  
   
   
       13 . The assembly of  claim 10  wherein each bushing is recessed relative to a radially innermost surface of said tip shroud segment such that said bushing does not protrude into a flowpath along the airfoil portions of the vanes.  
   
   
       14 . The assembly of  claim 11  wherein each bushing is recessed relative to a radially innermost surface of said tip shroud segment such that said bushing does not protrude into a flowpath along the airfoil portions of the vanes.  
   
   
       15 . The assembly of  claim 11  wherein each bushing is formed with a center hole counterbored to provide an internal shoulder that provides a seat for the respective tenon and wherein said tenon is welded to said bushing at said internal shoulder.  
   
   
       16 . A stator vane segment and tip shroud segment assembly comprising: 
 a plurality of vanes, each having an airfoil portion and a radially inner tip, each tip formed with at least one radially inwardly projecting tenon;    a tip shroud segment extending over the radially inner tips of the vanes, said tip shroud segment formed with a plurality of holes, each hole fitted with a bushing that receives a respective one of said tenons;    wherein each bushing is formed with an external shoulder engaged by said tip shroud; and    wherein each bushing is formed with a center hole counterbored to provide an internal shoulder that provides a seat for the respective tenon and wherein said tenon is welded to said bushing at said internal shoulder.    
   
   
       17 . The assembly of  claim 16 , wherein each bushing is recessed relative to a radially innermost surface of said tip shroud such that said bushing does not protrude into a flowpath along the airfoil portions of the vanes.  
   
   
       18 . The assembly of  claim 16  wherein each vane has an attachment portion, and wherein a strap extends across the attachment portions of the respective plurality of vanes, said strap attached to each of the attachment portions.