Rotary device

Abstract

A rotary device includes an impeller, a plurality of vanes that is located radially outside the impeller and that is arranged along a circumferential direction, a housing body that encloses the impeller, a shroud piece that is discrete from the housing body, the shroud piece including at least a part of a shroud that faces blade surfaces of the impeller and being in contact with or fixed to at least a part of each of the plurality of vanes, a surface that faces the shroud piece across the plurality of vanes, and an elastic body that is arranged between the housing body and the shroud piece and that presses the shroud piece and the plurality of vanes toward the surface.

What is claimed is: 
     
         1 . A rotary device comprising:
 an impeller;   a plurality of vanes that is located radially outside the impeller and that is arranged along a circumferential direction;   a housing body that encloses the impeller;   a shroud piece that is discrete from the housing body, the shroud piece including at least a part of a shroud that faces blade surfaces of the impeller and being in contact with or fixed to at least a part of each of the plurality of vanes;   a surface that faces the shroud piece across the plurality of vanes; and   an elastic body that is arranged between the housing body and the shroud piece and that presses the shroud piece and the plurality of vanes toward the surface.   
     
     
         2 . The rotary device according to  claim 1 , wherein
 the elastic body includes a disc spring that is arranged around a central axis of the impeller, and   the disc spring is arranged radially outside a radially-outermost part of the impeller, and an inner edge of the disc spring presses the shroud piece.   
     
     
         3 . The rotary device according to  claim 1 , wherein
 the elastic body includes a disc spring that is arranged around a central axis of the impeller, and   the disc spring is arranged radially inside a radially-outermost part of the impeller, and an outer edge of the disc spring presses the shroud piece.   
     
     
         4 . The rotary device according to  claim 1 , wherein
 the elastic body includes a disc spring that is arranged around a central axis of the impeller, and   the disc spring overlaps a radially-outermost part of the impeller in a radial direction, and one of an inner edge and an outer edge of the disc spring closer to the radially-outermost part of the impeller presses the shroud piece.   
     
     
         5 . The rotary device according to  claim 1 , wherein the shroud piece is in contact with or fixed to the whole each of the plurality of vanes. 
     
     
         6 . The rotary device according to  claim 1 , wherein the shroud piece ends at a position between an innermost end and an outermost end of each of the plurality of vanes in a radial direction.