US 11,953,016 B2
Blower
Mikihiro Kataoka, Ibaraki (JP); and Naoto Ichihashi, Ibaraki (JP)
Assigned to Koki Holdings Co., Ltd., Tokyo (JP)
Appl. No. 17/635,365
Filed by Koki Holdings Co., Ltd., Tokyo (JP)
PCT Filed Jul. 31, 2020, PCT No. PCT/JP2020/029531
§ 371(c)(1), (2) Date Feb. 14, 2022,
PCT Pub. No. WO2021/039291, PCT Pub. Date Mar. 4, 2021.
Claims priority of application No. 2019-156572 (JP), filed on Aug. 29, 2019.
Prior Publication US 2022/0341432 A1, Oct. 27, 2022
Int. Cl. F04D 25/08 (2006.01); F04D 29/54 (2006.01); F04D 29/58 (2006.01)
CPC F04D 25/08 (2013.01) [F04D 29/542 (2013.01); F04D 29/58 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A blower comprising:
a motor with a rotary shaft extending in an axial direction;
a fan comprising a first wall surrounding the rotary shaft, a second wall surrounding the rotary shaft, and a plurality of curved blades disposed between the first wall and the second wall, the fan configured to rotate by a driving force of the motor and to generate an air flow;
a tubular motor holder formed in a tubular shape extending in the axial direction of the rotary shaft and configured to hold the motor radially inside thereof; and
a fan case formed in a tubular shape extending in the axial direction, configured to accommodate the motor, the motor holder, and the fan and to form a flow path of the air flow;
wherein the fan case has:
a large diameter portion, accommodating the motor, the motor holder and the fan;
a cylindrical tip part, having a diameter smaller than a diameter of the large diameter portion, the cylindrical tip part having an opening disposed such that an axial line of the rotary shaft passes through the opening;
a tapered part, connecting the large diameter portion and the cylindrical tip part, the tapered part is tapered such that, in the axial direction, a diameter of the tapered part becomes smaller moving away from the large diameter portion;
a plurality of ribs, integrally formed with the tapered part, each rib protrudes inward from an inner peripheral surface of the tapered part, an inward end of each rib is separated from the motor and the motor holder, and each rib extends along the axial direction of the rotary shaft.