Radial seal pin

Abstract

The present application provides a turbine bucket. The turbine bucket may include a shank, a radial seal pin slot positioned on the shank, and a seal pin positioned within the radial seal pin slot. The seal pin may include a pair of shouldered ends.

1 . A turbine bucket, comprising:
 a shank;   a radial seal pin slot positioned on the shank; and   a seal pin positioned within the radial seal pin slot;   the seal pin comprising a pair of shouldered ends.   
     
     
         2 . The turbine bucket of  claim 1 , wherein the shank comprises a pair of radial seal pin slots. 
     
     
         3 . The turbine bucket of  claim 1 , wherein the pair of shouldered ends comprises a rounded portion and a flat portion. 
     
     
         4 . The turbine bucket of  claim 1 , wherein the seal pin comprises a first length, the radial seal pin slot comprises a second length, and wherein the first length is shorter than the second length. 
     
     
         5 . The turbine bucket of  claim 1 , further comprising a pair of buckets with a gap in between and wherein the seal pin is positioned in the gap. 
     
     
         6 . The turbine bucket of  claim 5 , wherein the shank comprises a cover plate with a bucket angle α. 
     
     
         7 . The turbine bucket of  claim 6 , wherein the radial seal pin slot comprises a seal pocket face with a seal pin bucket angle β. 
     
     
         8 . The turbine bucket of  claim 7 , wherein the radial seal pin slot comprises an angled corner with an angle γ. 
     
     
         9 . The turbine bucket of  claim 8 , wherein the combination of the angles α, β, and γ and a centrifugal force position the seal pin in the gap. 
     
     
         10 . The turbine bucket of  claim 1 , wherein the shank comprises an outer diameter gap and an inner diameter gap and wherein the pair of shouldered ends fill the outer diameter gap and the inner diameter gap. 
     
     
         11 . The turbine bucket of  claim 1  wherein the seal pin comprises a nickel-chromium alloy. 
     
     
         12 . A turbine bucket, comprising:
 a shank;   a pair of radial seal pin slots positioned on the shank; and   a seal pin positioned within each of the pair of radial seal pin slots;   the seal pin comprising a pair of shouldered ends with a rounded portion and a flat portion.   
     
     
         13 . The turbine bucket of  claim 12 , wherein each of the seal pins comprises a first length, each of the radial seal pin slots comprise a second length, and wherein the first length is shorter than the second length. 
     
     
         14 . The turbine bucket of  claim 1 , further comprising a pair of buckets with a gap in between and wherein the seal pins are positioned in the gap. 
     
     
         15 . The turbine bucket of  claim 14 , wherein the shank comprises a cover plate with a bucket angle α. 
     
     
         16 . The turbine bucket of  claim 15 , wherein the radial seal pin slots comprise a seal pocket face with a seal pin bucket angle β. 
     
     
         17 . The turbine bucket of  claim 16 , wherein the radial seal pin slot comprises an angled corner with an angle γ. 
     
     
         18 . The turbine bucket of  claim 17 , wherein the combination of the angles α, β, and γ and a centrifugal force position the seal pins in the gap. 
     
     
         19 . The turbine bucket of  claim 12 , wherein the shank comprises an outer diameter gap and an inner diameter gap and wherein the pair of shouldered ends fill the outer diameter gap and the inner diameter gap. 
     
     
         20 . The turbine bucket of  claim 12  wherein the seal pin comprises a nickel-chromium alloy.