Impeller and rotary machine

Abstract

An impeller includes: a disc portion fixed to a rotary shaft that rotates around an axis line; a cover portion disposed to face the disc portion; and a plurality of blade portions provided between the disc portion and the cover portion. The impeller includes a first segment configured of a first disc portion that is a portion of the disc portion on one side of the axis line, a second segment in which a second disc portion that is a portion of the disc portion on another side of the axis line, the cover portion, and the blade portions are integrally configured, and a bonding layer configured to bond the first disc portion of the first segment and the second disc portion of the second segment with a bonding agent.

1 . An impeller, comprising:
 a disc portion fixed to a rotary shaft that rotates around an axis line;   a cover portion disposed to face the disc portion; and   a plurality of blade portions provided between the disc portion and the cover portion, wherein   the impeller includes a first segment configured of a first disc portion that is a portion of the disc portion on one side of the axis line, a second segment in which a second disc portion that is a portion of the disc portion on another side of the axis line, the cover portion, and the blade portions are integrally configured, and a bonding layer configured to bond the first disc portion of the first segment and the second disc portion of the second segment with a bonding agent.   
     
     
         2 . The impeller according to  claim 1 , wherein
 the first segment is made of a metal material or a fiber-reinforced plastic, and   the second segment is made of a metal material or a fiber-reinforced plastic.   
     
     
         3 . The impeller according to  claim 1 , wherein
 the first segment is made of a metal material, and   the second segment is made of a fiber-reinforced plastic.   
     
     
         4 . The impeller according to  claim 1 , wherein both of the first segment and the second segment are made of a fiber-reinforced plastic. 
     
     
         5 . The impeller according to  claim 1 , wherein both of the first segment and the second segment are made of a metal material. 
     
     
         6 . The impeller according to  claim 1 , wherein the impeller is fixed to the rotary shaft through the first disc portion of the first segment. 
     
     
         7 . The impeller according to  claim 6 , wherein the first segment is made of a metal material and is fitted to the rotary shaft with an interference. 
     
     
         8 . The impeller according to  claim 6 , wherein the first segment is made of a fiber-reinforced plastic and is fitted to the rotary shaft with a bonding agent. 
     
     
         9 . The impeller according to  claim 1 , wherein a film made of a metallic salt is provided on a surface on which the bonding layer is to be provided, of each of the first segment and the second segment each made of a metal material. 
     
     
         10 . The impeller according to  claim 1 , wherein a mechanical fitting structure is provided between the first disc portion of the first segment and the second disc portion of the second segment. 
     
     
         11 . A rotary machine comprising the impeller according to  claim 1 . 
     
     
         12 . The impeller according to  claim 2 , wherein the impeller is fixed to the rotary shaft through the first disc portion of the first segment. 
     
     
         13 . The impeller according to  claim 3 , wherein the impeller is fixed to the rotary shaft through the first disc portion of the first segment. 
     
     
         14 . The impeller according to  claim 2 , wherein a film made of a metallic salt is provided on a surface on which the bonding layer is to be provided, of each of the first segment and the second segment each made of a metal material. 
     
     
         15 . The impeller according to  claim 2 , wherein a mechanical fitting structure is provided between the first disc portion of the first segment and the second disc portion of the second segment. 
     
     
         16 . A rotary machine comprising the impeller according to  claim 2 . 
     
     
         17 . A rotary machine comprising the impeller according to  claim 3 .