Seal structure and rotating machine equipped therewith

Abstract

Provided is a seal structure, which includes fins configured to protrude from an outer circumferential surface of a rotor in a circumferential direction, and stator blades having an abradable coating formed on an inner circumferential surface of an inner shroud so as to face the fins. The inner circumferential surface of the inner shroud is formed in an uneven shape, and the abradable coating is formed along the uneven shape.

1 . A seal structure comprising:
 a fin configured to protrude from an outer circumferential surface of a rotor in a circumferential direction; and   a stator blade having an abradable coating formed on an inner circumferential surface of an inner shroud so as to face the fins,   wherein the inner circumferential surface of the inner shroud is formed in an uneven shape, and the abradable coating is formed along the uneven shape.   
     
     
         2 . The seal structure according to  claim 1 , wherein the uneven shape is configured by a concave portion formed from one of the inner circumferential surface of the inner shroud and an outer circumferential surface of the abradable coating toward an interior thereof. 
     
     
         3 . The seal structure according to  claim 2 , wherein the concave portion is formed so as to extend in the circumferential direction. 
     
     
         4 . The seal structure according to  claim 2 , wherein the concave portion is formed so as to extend in an axial direction of the rotor. 
     
     
         5 . The seal structure according to  claim 3 , wherein the concave portion is formed on a boundary line between the inner shrouds adjacent in the circumferential direction. 
     
     
         6 . The seal structure according to  claim 4 , wherein:
 the one of the inner circumferential surface of the inner shroud and the outer circumferential surface of the abradable coating is formed with a second concave portion so as to be opposite to the concave portion formed in the other of the inner circumferential surface of the inner shroud and the outer circumferential surface of the abradable coating; and   the seal structure includes a pin member inserted between the concave portion and the second concave portion.   
     
     
         7 . The seal structure according to  claim 3 , wherein the concave portion is formed so that a width thereof in a cross section perpendicular to an extending direction thereof gradually widens from the one of the inner circumferential surface of the inner shroud and the outer circumferential surface of the abradable coating toward a bottom thereof. 
     
     
         8 . The seal structure according to  claim 4 , wherein the concave portion is formed so that a width thereof in a cross section perpendicular to an extending direction thereof gradually widens from the one of the inner circumferential surface of the inner shroud and the outer circumferential surface of the abradable coating toward a bottom thereof. 
     
     
         9 . The seal structure according to  claim 5 , wherein the concave portion is formed so that a width thereof in a cross section perpendicular to an extending direction thereof gradually widens from the one of the inner circumferential surface of the inner shroud and the outer circumferential surface of the abradable coating toward a bottom thereof. 
     
     
         10 . The seal structure according to  claim 2 , wherein the concave portion is formed in an arcuate shape in which a cross section perpendicular to an extending direction thereof swells from the one of the inner circumferential surface of the inner shroud and the outer circumferential surface of the abradable coating. 
     
     
         11 . The seal structure according to  claim 3 , wherein the concave portion is formed in an arcuate shape in which a cross section perpendicular to an extending direction thereof swells from the one of the inner circumferential surface of the inner shroud and the outer circumferential surface of the abradable coating. 
     
     
         12 . The seal structure according to  claim 4 , wherein the concave portion is formed in an arcuate shape in which a cross section perpendicular to an extending direction thereof swells from the one of the inner circumferential surface of the inner shroud and the outer circumferential surface of the abradable coating. 
     
     
         13 . The seal structure according to  claim 5 , wherein the concave portion is formed in an arcuate shape in which a cross section perpendicular to an extending direction thereof swells from the one of the inner circumferential surface of the inner shroud and the outer circumferential surface of the abradable coating. 
     
     
         14 . A rotating machine having the seal structure according to  claim 1 . 
     
     
         15 . A rotating machine having the seal structure according to  claim 2 . 
     
     
         16 . A rotating machine having the seal structure according to  claim 3 . 
     
     
         17 . A rotating machine having the seal structure according to  claim 4 . 
     
     
         18 . A rotating machine having the seal structure according to  claim 5 . 
     
     
         19 . A rotating machine having the seal structure according to  claim 6 . 
     
     
         20 . A rotating machine having the seal structure according to  claim 7 .