| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an impeller capable of preventing floating of a shrink-fitting part even when rotated at a high speed. <P>SOLUTION: In this impeller 100 including a hub 111 forming a cylindrical shape, an annular disk 112 coaxially provided at an outer circumference of the hub 111, a plurality of blades 113 provided at a front side of the disk 112 at predetermined intervals in a circumferential direction, an annular shroud 114 provided at the blade 113 coaxially with the hub 111 so that the blade 113 is held between the disk 112 and the shroud, and a shrink-fitting part 117 protrudingly provided at an inner circumference of the hub 111 at an end side at a back side of the disk 112, the shrink-fitting part 117 is formed so that an inner diameter of the shrink-fitting part 117 at the end side at the front side of the disk 112 of the hub 111 is smaller than an inner diameter of the shrink-fitting part 117 at the end side at the back side of the disk 112 of the hub 111. <P>COPYRIGHT: (C)2013,JPO&INPIT |
