Impeller and centrifugal compressor

Abstract

The present invention is provided with: a disk ( 2 ) that rotates around an axis (O); and, on the surface of one axial (O) side of the disk ( 2 ), a plurality of blades ( 3 ) that are provided at intervals in the circumferential direction and demarcate a channel ( 10 ) in which a fluid that flows in from one side in the axial (O) direction is discharged toward the outer side in the radial direction. Therein, holes (H) are formed in the blades ( 3 ), said holes communicating with a pressure surface (p) that faces the front side in the rotational direction, and with a suction surface (n) that faces the rear side in the rotational direction.

1 . An impeller comprising:
 a disk which rotates around an axis; and   a plurality of blades which are provided at intervals therebetween in a circumferential direction on one side surface in an axial direction of the disk, and demarcate a channel through which a fluid flowing in from the one side in the axial direction is discharged toward the outside in a radial direction,   wherein a hole is formed in the blade, and the hole communicates with a pressure surface facing a front side in a rotational direction and a suction surface facing a rear side in the rotational direction.   
     
     
         2 . The impeller according to  claim 1 ,
 wherein the hole extends toward a downstream side of the channel as the hole is directed from the pressure surface side to the suction surface side.   
     
     
         3 . The impeller according to  claim 1  or  2 ,
 wherein a plurality of holes are arranged so as to be separated from each other from the inside in the radial direction toward the outside in the radial direction. 
 
     
     
         4 . The impeller according to  claim 1 ,
 wherein an opening area of the hole increases from the pressure surface side toward the suction surface side.   
     
     
         5 . The impeller according to  claim 1 ,
 wherein the opening area of the hole decreases from the pressure surface side toward the suction surface side.   
     
     
         6 . The impeller according to  claim 1 ,
 wherein the hole has a groove which is spirally formed on an inner peripheral surface of the hole.   
     
     
         7 . The impeller according to  claim 1 ,
 wherein the hole includes one inflow port which is provided on the pressure surface side, and a plurality of injection ports which communicate with the inflow port and are provided on the suction surface side.   
     
     
         8 . A centrifugal compressor comprising the impeller according to  claim 1 .