Impeller and rotary machine

Abstract

An impeller includes a hub having a circular plate shape with an axial line as a center, a shroud disposed to face the hub in a direction of the axial line, and a plurality of blades disposed with a space from each other in a circumferential direction between the hub and the shroud. A meridian plane shape of the impeller differs in the circumferential direction.

1 . An impeller comprising:
 a hub having a circular plate shape with an axial line as a center;   a shroud disposed to face the hub in a direction of the axial line; and   a plurality of blades disposed with a space from each other in a circumferential direction between the hub and the shroud, wherein   a meridian plane shape of the impeller differs in the circumferential direction.   
     
     
         2 . The impeller according to  claim 1 , wherein in a flow channel sectioned by the hub, the shroud, and a pair of the blades, a position of an outlet on an outer peripheral part side is shifted from one another in the direction of the axial line at a different position in the circumferential direction. 
     
     
         3 . The impeller according to  claim 2 , wherein the outlet is arranged along an inclination line with a predetermined inclination angle with respect to a reference line along the circumferential direction. 
     
     
         4 . The impeller according to  claim 3 , wherein the outlet has a passage with a quadrangle shape. 
     
     
         5 . The impeller according to  claim 3 , wherein the outlet has a passage with a hexagonal shape. 
     
     
         6 . The impeller according to  claim 1 , wherein a thickness of the blade on an outer peripheral part side in a middle part between the hub and the shroud is smaller than a thickness on the outer peripheral part side on the hub side and a thickness on the outer peripheral part side on the shroud side. 
     
     
         7 . The impeller according to  claim 1 , wherein the impeller is a closed impeller in which the blades are fixed to the hub on one side and fixed to the shroud on the other side. 
     
     
         8 . A rotary machine comprising the impeller according to  claim 1 .