| 摘要 |
PROBLEM TO BE SOLVED: To provide a fan for effectively preventing a balance weight, which is mounted by filling thereof in a recess provided in a rotor, from coming off from recess during or after adjustment of rotation balance.SOLUTION: A fan includes: a rotor 20 consisting of an impeller 23, in which blades 22 are provided on an outer circumferential part of a hub 21, and a shaft 10 provided at the center of the hub 21, and is freely rotatably supported around the shaft 10 as a center; and a recess 40, which is formed in a surface 212 across the axial direction of the hub 21, and filled with a clay-like weight (balance weight) 70 such as putty. The recess 40 includes: a first area 41 which is arranged on the same circumference and extends substantially in the circumferential direction; and a second area 42 which is formed continuously on the outer circumferential side of the first area 41 while its circumferential length is shorter than that of the first area 41. The weight 70 is filled at least in the second area 42 to adjust rotation balance, and the weight 70 is prevented from coming off by tightly attaching the weight 70 to wall surfaces 421, 422 along the radial direction in the second area 42. |
