Turbine Rotor

Abstract

An object of the present invention is to provide a turbine rotor with high reliability of strength. The turbine rotor includes two rotors which are connected at the butted portions of the rotors via a weld without forming penetration beads. Specifically, the turbine rotor includes a rotor for low pressure, a rotor for high pressure, and a center hole formed at a center portion of the turbine rotor. The rotors for low pressure and for high pressure are integrated together into a steam turbine rotor by welding respective ends of the rotors to each other. The respective ends of the rotors are in contact with each other via at least two contact faces in a radial direction and an axial direction of the turbine rotor. At least parts of the respective ends are welded together.

1 . A turbine rotor comprising:
 a rotor for low pressure;   a rotor for high pressure, the rotors for low pressure and for high pressure being integrated together into a steam turbine rotor by welding respective ends of the rotors to each other; and   a center hole formed at a center portion of the turbine rotor,   wherein the respective ends of the rotors are in contact with each other via at least two contact faces in a radial direction and an axial direction of the turbine rotor; and at least parts of the respective ends are welded together.   
     
     
         2 . The turbine rotor according to  claim 1 ,
 wherein the respective ends of the rotors are welded to each other via a weld including weld metal; and at least a part of the weld is located on the contact face in the axial direction.   
     
     
         3 . The turbine rotor according to  claim 1 ,
 wherein the respective ends of the rotors are welded to each other via a weld including weld metal; and the contact face in the radial direction is located on a lower pressure side of the turbine rotor with respect to the weld.   
     
     
         4 . The turbine rotor according to  claim 1 ,
 wherein the contact face in the radial direction has a radial length of 0.5 to 2.0 mm.   
     
     
         5 . The turbine rotor according to  claim 1 ,
 wherein the respective ends of the rotors are welded to each other via a weld including weld metal; and the contact face in the axial direction is located on a lower pressure side of the turbine rotor with respect to the weld.   
     
     
         6 . The turbine rotor according to  claim 1 ,
 wherein the contact face in the axial direction is located on a higher pressure side with respect to the contact face in the radial direction.   
     
     
         7 . The turbine rotor according to  claim 1 ,
 wherein no through hole is formed from an outer peripheral surface of the turbine rotor to the center hole.   
     
     
         8 . A turbine rotor comprising:
 a rotor for low pressure;   a rotor for high pressure, the rotors for low pressure and for high pressure being integrated together into a steam turbine rotor by welding respective ends of the rotors to each other; and   a center hole formed at a center portion of the turbine rotor,   wherein the respective ends of the rotors have stepped structures to be engaged to each other; and   each of the stepped structures has at least two contact faces in a radial direction of the turbine rotor, the respective ends of the rotors being in contact with each other via the contact faces.   
     
     
         9 . The turbine rotor according to  claim 8 ,
 wherein the contact faces located in an outermost position from a center of the turbine rotor among the contact faces in the radial direction are welded.