Patent ID: 9371840
Filing Date: 2016-06-21
CPC Classification: F04D

Claim Text:
1. A centrifugal blowing fan for radially exhausting air axially taken therein, the centrifugal blowing fan comprising: a back yoke made from metal, the back yoke having a substantially bottomed cylindrical portion around a rotating shaft of a motor, an inner surface attached with a magnet of the motor mounted thereon and a flange portion disposed around a periphery of an opening of the cylindrical portion, and the back yoke rotating integrally with the rotating shaft; and a cylindrical impeller made from resin, the impeller having a plurality of blades circumferentially arranged, an annular collar portion joined with first ends of the plurality of blades and a doughnut-shaped disk portion joined with second ends of the plurality of blades, wherein, in a radial direction, the cylindrical portion of the back yoke has an outer diameter smaller than an inner diameter of the impeller, and the flange portion extends below the second ends of the plurality of blades to have an outer diameter substantially same to or slightly larger than an outer diameter of the disk portion of the impeller, and wherein the disk portion of the impeller has at least one fitting, and the flange portion of the back yoke has at least one fitted space receiving the at least one fitting so as to concentrically and fixedly connect the impeller and the back yoke in a state where the disk portion and the flange portion of the back yoke are joined.