US2004115059A1PendingUtilityA1

Cored steam turbine bucket

27
Priority: Dec 12, 2002Filed: Dec 12, 2002Published: Jun 17, 2004
Est. expiryDec 12, 2022(expired)· nominal 20-yr term from priority
Inventors:Richard Eugene KehlRonald Scott Bunker
F05D 2230/21F01D 5/147F01D 5/225
27
PatentIndex Score
0
Cited by
0
References
0
Claims

Abstract

Steam turbine buckets are formed by investment casting to be hollow or to have a lightweight lattice-work internal core. The process is also used to integrally form steam turbine buckets having a variety of dovetail configurations, including a tangential fir-tree dovetail, a tangential slot dovetail and an axial gas turbine style dovetail. The investment casting process can also be used to integrally cast a cover at one end of the steam turbine bucket.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
         1 . A method of forming a steam turbine bucket airfoil by using an investment casting process and forming a hollow steam turbine bucket airfoil.  
     
     
         2 . The method as claimed in  claim 1 , wherein a cover is integrally cast with the hollow steam turbine bucket airfoil.  
     
     
         3 . The method as claimed in  claim 1 , wherein the formed hollow steam turbine bucket airfoil is integrally cast with a tangential fir-tree dovetail.  
     
     
         4 . The method as claimed in  claim 1 , wherein the formed hollow steam turbine bucket airfoil is integrally cast with a tangential slot dovetail.  
     
     
         5 . The method as claimed in  claim 1 , wherein the formed hollow steam turbine bucket airfoil is integrally cast with an axial entry dovetail.  
     
     
         6 . The method as claimed in  claim 2 , wherein the formed hollow steam turbine bucket airfoil is integrally cast with a tangential fir-tree dovetail.  
     
     
         7 . The method as claimed in  claim 2 , wherein the formed hollow steam turbine bucket airfoil is integrally cast with a tangential slot dovetail.  
     
     
         8 . The method as claimed in  claim 2 , wherein the formed hollow steam turbine bucket airfoil is integrally cast with an axial entry dovetail.  
     
     
         9  A method of forming a steam turbine bucket airfoil, said method comprising utilizing an investment casting process to form an internal core of the steam turbine bucket airfoil having a lattice-work.  
     
     
         10 . The method as claimed in  claim 9 , wherein a cover is integrally cast with the steam turbine bucket airfoil having a lattice work.  
     
     
         11 . The method as claimed in  claim 9 , wherein the formed steam turbine bucket airfoil is integrally cast with a tangential fir-tree dovetail.  
     
     
         12 . The method as claimed in  claim 9 , wherein the formed steam turbine bucket airfoil is integrally cast with a tangential slot dovetail.  
     
     
         13 . The method as claimed in  claim 9 , wherein the formed steam turbine bucket airfoil is integrally cast with an axial entry dovetail.  
     
     
         14 . The method as claimed in  claim 10 , wherein the formed steam turbine bucket airfoil is integrally cast with a tangential fir-tree dovetail.  
     
     
         15 . The method as claimed in  claim 10 , wherein the formed steam turbine bucket airfoil is integrally cast with a tangential slot dovetail.  
     
     
         16 . The method as claimed in  claim 10 , wherein the formed steam turbine bucket airfoil is integrally cast with an axial entry dovetail.  
     
     
         17 . A steam turbine bucket airfoil for use in a steam turbine comprising a lattice-work internal core.  
     
     
         18 . The steam turbine bucket airfoil as claimed in  claim 17 , further comprising a cover formed at one end.  
     
     
         19 . The steam turbine bucket airfoil claimed in  claim 17 , further comprising a tangential fir-tree dovetail.  
     
     
         20 . The steam turbine bucket airfoil claimed in  claim 17 , further comprising a tangential slot dovetail.  
     
     
         21 . The steam turbine bucket airfoil claimed in  claim 17 , further comprising an axial entry dovetail.  
     
     
         22 . The steam turbine bucket airfoil claimed in  claim 18 , further comprising a tangential fir-tree dovetail.  
     
     
         23 . The steam turbine bucket airfoil claimed in  claim 18 , further comprising a tangential slot dovetail.  
     
     
         24 . The steam turbine bucket airfoil claimed in  claim 18 , further comprising an axial entry dovetail.  
     
     
         25 . A steam turbine bucket airfoil for use in a steam turbine comprising a hollow airfoil core.  
     
     
         26 . The steam turbine bucket airfoil as claimed in  claim 25 , further comprising a cover formed at one end.  
     
     
         27 . The steam turbine bucket airfoil claimed in  claim 25 , further comprising a tangential fir-tree dovetail.  
     
     
         28 . The steam turbine bucket airfoil claimed in  claim 25 , further comprising a tangential slot dovetail.  
     
     
         29 . The steam turbine bucket airfoil claimed in  claim 25 , further comprising an axial entry dovetail.  
     
     
         30 . The steam turbine bucket airfoil claimed in  claim 26 , further comprising a tangential fir-tree dovetail.  
     
     
         31 . The steam turbine bucket airfoil claimed in  claim 26 , further comprising a tangential slot dovetail.  
     
     
         32 . The steam turbine bucket airfoil claimed in  claim 26 , further comprising an axial entry dovetail.

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