Rotation device

Abstract

A rotation device includes an impeller, a plurality of vanes that are arranged along a circumferential direction in an area radially outside the impeller and that protrude in an axial direction, a first wall surface that faces a protruding end of each of the plurality of vanes in the axial direction, and an inclined surface that is formed on at least one of the first wall surface and the protruding ends of the plurality of vanes and that is inclined with respect to a radial direction of the impeller.

What is claimed is: 
     
         1 . A rotation device, comprising:
 an impeller;   a plurality of vanes that are arranged along a circumferential direction in an area radially outside the impeller and that protrude in an axial direction;   a first wall surface that faces a protruding end of each of the plurality of vanes in the axial direction; and   an inclined surface that is formed on at least one of the first wall surface and the protruding ends of the plurality of vanes and that is inclined with respect to a radial direction of the impeller.   
     
     
         2 . The rotation device according to  claim 1 , comprising:
 an annular vane plate that is arranged radially outside the impeller and that includes a first surface facing the axial direction and a second surface opposite to the first surface, the plurality of vanes protruding from the first surface of the vane plate;   a second wall surface that faces the first wall surface across the vane plate and the plurality of vanes in the axial direction, the second wall surface facing the second surface of the vane plate; and   an elastic body that is arranged between the second surface of the vane plate and the second wall surface and that presses the vane plate and the plurality of vanes toward the first wall surface.   
     
     
         3 . The rotation device according to  claim 1 ,
 wherein   the inclined surface is formed on the first wall surface, and   the first wall surface includes a discontinuous portion that is positioned radially inside the protruding ends of the plurality of vanes and that protrudes from the inclined surface.