Strut structure and axial flow rotary machine including same

Abstract

A strut structure includes: a hollow outer cylinder strut that extends in a direction intersecting with a rotation direction of a rotation part of an axial flow rotary machine, and is coupled to a fixed part supporting the rotation part and a base part supporting the axial flow rotary machine; and an internally hollow inner cylinder strut that is disposed inside the outer cylinder strut.

1 . A strut structure comprising:
 a hollow outer cylinder strut that extends in a direction intersecting with a rotation direction of a rotation part of an axial flow rotary machine, and is coupled to a fixed part for supporting the rotation part and a base part for supporting the axial flow rotary machine; and   an internally hollow inner cylinder strut that is disposed inside the outer cylinder strut.   
     
     
         2 . The strut structure according to  claim 1 , wherein the inner cylinder strut is fitted to the outer cylinder strut by clearance fit. 
     
     
         3 . The strut structure according to  claim 2 , wherein at least one of an inner peripheral part of the outer cylinder strut and an outer peripheral part of the inner cylinder strut has an uneven shape. 
     
     
         4 . The strut structure according to  claim 1 , further comprising a damping part that damps vibration between an inner peripheral part of the outer cylinder strut and an outer peripheral part of the inner cylinder strut. 
     
     
         5 . The strut structure according to  claim 4 , wherein
 the inner cylinder strut has a length shorter than a total length of the outer cylinder strut, and   the strut structure comprises:
 a cover part that is disposed at an end part of the inner cylinder strut that is not connected to another portion to cover the end part of the inner cylinder strut; and 
 a partition part that is disposed at an end part of the outer cylinder strut on a side on which the inner cylinder strut includes the cover part to partition off the outer cylinder strut into a region in which the damping part is disposed and a region in which the damping part is not disposed. 
   
     
     
         6 . The strut structure according to  claim 5 , wherein the outer cylinder strut includes a diaphragm part that is able to be expanded, contracted, or deformed, and is disposed at an end part on a side on which the damping part is disposed. 
     
     
         7 . A strut structure comprising:
 an internally hollow outer cylinder strut that extends in a direction intersecting with a rotation direction of a rotation part of an axial flow rotary machine, and that is coupled to a fixed part for supporting the rotation part and a base part for supporting the axial flow rotary machine;   a diaphragm part that is able to be expanded, contracted, or deformed, is disposed at an end part at which the outer cylinder strut is connected to the base part or the fixed part, and includes a damping part inside; and   a disk structure that is disposed to be connected to the end part of the outer cylinder strut inside the diaphragm part.   
     
     
         8 . A strut structure comprising:
 an internally hollow outer cylinder strut that extends in a direction intersecting with a rotation direction of a rotation part of an axial flow rotary machine, that is coupled to a fixed part supporting the rotation part and a base part supporting the axial flow rotary machine;   a diaphragm part that is able to be expanded, contracted, or deformed, and is disposed at an end part at which the outer cylinder strut is connected to the base part or the fixed part; and   a damping structure that is disposed between the diaphragm part and the base part or the fixed part, and includes a damping part and a disk structure disposed to be connected to the end part of the outer cylinder strut inside.   
     
     
         9 . An axial flow rotary machine comprising:
 the strut structure according to  claim 1 ;   a fixed part supported by the strut structure; and   a rotation part that is supported to be rotatable by the fixed part, and rotates in a direction intersecting with an axial direction of the strut structure.   
     
     
         10 . An axial flow rotary machine comprising:
 the strut structure according to  claim 7 ;   a fixed part supported by the strut structure; and   a rotation part that is supported to be rotatable by the fixed part, and rotates in a direction intersecting with an axial direction of the strut structure.   
     
     
         11 . An axial flow rotary machine comprising:
 the strut structure according to  claim 8 ;   a fixed part supported by the strut structure; and   a rotation part that is supported to be rotatable by the fixed part, and rotates in a direction intersecting with an axial direction of the strut structure.