Turbine rotor blade and fixation structure thereof

Abstract

Disclosed is a turbine rotor blade that is highly manufacturable and capable of reducing the stress caused by centrifugal force. The turbine rotor blade includes: a vane portion having a blade leading edge which is positioned upstream in the distribution direction of working fluid, and a blade trailing edge which is positioned downstream of the blade leading edge; and a blade base portion which is extended unidirectionally on a base side of the vane portion and engaged with a blade groove formed in the outer circumference of a turbine rotor. The turbine rotor circumferential position of the end of the blade base portion on the side toward the blade leading edge is different from the turbine rotor circumferential position of the end of the blade base portion on the side toward the blade trailing edge.

1 . A turbine rotor blade comprising:
 a vane portion having a blade leading edge positioned upstream in the distribution direction of working fluid and a blade trailing edge positioned downstream of the blade leading edge; and   a blade base portion which is extended unidirectionally on a base side of the vane portion and engaged with a blade groove formed in the outer circumference of a turbine rotor;   wherein an end of the blade base portion at the side of the blade leading edge is positioned to be different in the circumferential direction of a turbine rotor from an end of the blade base portion at the side of the blade trailing edge.   
   
   
       2 . The turbine rotor blade according to  claim 1 , wherein the position of the blade trailing edge in the circumferential direction of the turbine rotor is displaced in the rotational direction of the turbine rotor with respect to that of the blade leading edge in the circumferential direction of the turbine rotor. 
   
   
       3 . The turbine rotor blade according to  claim 2 , wherein the position of the end of the blade base portion at the side of the blade trailing edge in the circumferential direction of the turbine rotor is displaced in the rotational direction of the turbine rotor with respect to that of the end of the blade base portion at the side of the blade leading edge in the circumferential direction of the turbine rotor. 
   
   
       4 . The turbine rotor blade according to  claim 3 , wherein the blade base portion is provided along the direction of a line joining the blade leading edge to the blade trailing edge. 
   
   
       5 . The turbine rotor blade according to  claim 1 , wherein the blade base portion is a plurality of dovetails which are projected inward in the radial direction of the turbine rotor. 
   
   
       6 . The turbine rotor blade according to  claim 5 , wherein the projection directions of the plurality of dovetails are parallel to each other. 
   
   
       7 . The turbine rotor blade according to  claim 1 , wherein the blade base portion is shaped like an inverted Christmas tree. 
   
   
       8 . The turbine rotor blade according to  claim 1 , further comprising:
 a pinhole which is provided between the blade base portion and the blade groove; and   a fixing pin which is inserted into the pinhole.   
   
   
       9 . A turbine rotor blade comprising:
 a vane portion having a blade leading edge positioned upstream in the distribution direction of working fluid and a blade trailing edge positioned downstream of the blade leading edge; and   a blade base portion which is extended unidirectionally on a base side of the vane portion and engaged with a blade groove formed in the outer circumference of a turbine rotor;   wherein the blade base portion is a plurality of dovetails which are projected inward in radial direction of the turbine rotor, with the plurality of dovetails being projected in the direction parallel to each other.   
   
   
       10 . A turbine rotor blade fixation structure comprising:
 a turbine rotor blade that includes
 a vane portion having a blade leading edge positioned upstream in the distribution direction of working fluid and a blade trailing edge positioned downstream of the blade leading edge, and 
 a blade base portion which is extended unidirectionally on a base side of the vane portion and projected inward in the radial direction of the turbine rotor; and 
   a blade groove that is engaged with the blade base portion and provided in the outer circumference of a turbine rotor;   wherein the position of the end of the blade base portion at the side of the blade trailing edge in the circumferential direction of the turbine rotor is displaced in the rotational direction of the turbine rotor with respect to that of the end of the blade base portion at the side of the blade leading edge in the circumferential direction of the turbine rotor, and   wherein the blade base portion is extended in a direction inclined from the rotation axis of the turbine rotor.