Moving Blade and Turbine Using Moving Blade

Abstract

A moving blade 21 d is disposed in a last stage closest to a diffuser 10 among a plurality of stages of a turbine 9 including a turbine rotor 12 and a stationary body 14 . The diffuser 10 is connected to an outlet side of the stationary body 14 . A distal end of the moving blade 21 d is opposed to a seal fin 38 provided in the stationary body 14 . The moving blade 21 d includes a blade section 26 , a cover 27 and a guide 32 provided on a moving blade distal end face 31 , which is a surface of the cover 27 . The moving blade distal end face 31 extends in a rotation axis direction of the turbine rotor 12 , and the guide 32 includes a guide surface 41 located on a side close to the diffuser 10 with respect to the seal fin 38 and formed to incline upward in a direction from the seal fin 38 toward the diffuser 10.

What is claimed is: 
     
         1 . A moving blade disposed in a last stage closest to a diffuser among a plurality of stages of a turbine including a turbine rotor and a stationary body that covers the turbine rotor, the diffuser being connected to an outlet side of working fluid of the stationary body, a distal end of the moving blade being opposed to a seal fin provided in the stationary body, the moving blade comprising:
 a blade section;   a cover provided at a distal end portion of the blade section; and   a guide provided on a moving blade distal end face, which is a surface of the cover opposed to the stationary body, wherein   when the moving blade is assembled to the turbine, when viewed on a cross section cut along a plane including a rotation axis of the turbine rotor, the moving blade distal end face extends in a rotation axis direction of the turbine rotor, and the guide includes a guide surface located on a side close to the diffuser with respect to the seal fin and formed to incline upward in a direction from the seal fin toward the diffuser.   
     
     
         2 . The moving blade according to  claim 1 , wherein the guide is a projecting section projecting from the moving blade distal end face to the stationary body side or a concave section recessed from the moving blade distal end face to the rotation axis side. 
     
     
         3 . The moving blade according to  claim 2 , wherein a moving blade distal end circumferential speed Mach number obtained by dividing rotation circumferential speed of the distal end portion of the blade section by sonic speed of the working fluid flowing at the distal end portion of the blade section exceeds 1.0. 
     
     
         4 . The moving blade according to  claim 2 , wherein the guide surface is a curved surface having a convex shape toward the rotation axis. 
     
     
         5 . The moving blade according to  claim 2 , wherein the guide extends in a rotating direction of the turbine rotor and is provided such that both ends thereof are opposed to end portions of guides of moving blades adjacent to each other on both sides in the rotating direction. 
     
     
         6 . The moving blade according to  claim 2 , wherein the guide is provided along a rear edge portion of the moving blade distal end face. 
     
     
         7 . The moving blade according to  claim 2 , wherein, when viewed from the stationary body side, the guide is provided in a region on a rear surface side of the blade section on the moving blade distal end face and provided to close a channel between the blade section and a blade section of a moving blade adjacent to the rear surface side. 
     
     
         8 . A turbine comprising:
 a turbine rotor including the moving blade according to  claim 1 ; and   a stationary body including a stationary blade disposed to be opposed to the moving blade in the rotation axis direction.   
     
     
         9 . The turbine according to  claim 8 , wherein
 the seal fin is provided on the moving blade distal end face instead of being provided on the stationary body,   the guide is provided on a moving blade opposed surface, which is a surface of the stationary body opposed to the moving blade distal end face, instead of being provided on the moving blade distal end face, and   when the moving blade is assembled to the turbine, when viewed on a cross section cut along a plane including a rotation axis of the turbine rotor, the moving blade opposed surface extends in a rotation axis direction of the turbine rotor, and the guide includes a guide surface formed to incline downward in a direction from the seal fin toward the diffuser.