US 12,480,522 B2
Centrifugal blower
Fumiya Ishii, Kariya (JP); Jun Yamaoka, Kariya (JP); and Mari Fukada, Kariya (JP)
Assigned to DENSO CORPORATION, Aichi-pref. (JP)
Filed by DENSO CORPORATION, Kariya (JP)
Filed on Aug. 5, 2024, as Appl. No. 18/794,485.
Application 18/794,485 is a continuation of application No. PCT/JP2023/001323, filed on Jan. 18, 2023.
Claims priority of application No. 2022-018149 (JP), filed on Feb. 8, 2022.
Prior Publication US 2024/0392800 A1, Nov. 28, 2024
Int. Cl. F04D 29/28 (2006.01); F04D 29/42 (2006.01)
CPC F04D 29/281 (2013.01) [F04D 29/4226 (2013.01); F05D 2240/303 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A centrifugal blower comprising:
a case;
an electric motor that is supported by the case at a motor support position of the electric motor; and
a fan that is configured to be driven and rotated by the electric motor, wherein:
the fan includes:
a boss that is installed to an output shaft of the electric motor at a location which is on one side relative to the motor support position in an axial direction of the output shaft;
a main plate that extends outward from the boss in a radial direction of a central axis of the output shaft;
a plurality of blades that extend from the main plate toward the one side in the axial direction of the output shaft; and
a side plate that is joined to an end portion of each of the plurality of blades which faces the one side in the axial direction of the output shaft, wherein:
a weight of the main plate is larger than a weight of the side plate;
the main plate and the side plate are both inclined toward another side opposite to the one side in the axial direction of the output shaft as the main plate and the side plate approach an outer side in the radial direction;
the main plate has:
a first slope portion that has a gradient of an inclination that is inclined toward the another side in the axial direction of the output shaft as the first slope portion approaches the outer side in the radial direction, wherein the gradient of the inclination of the first slope portion is within a first range; and
a second slope portion that is placed on the outer side relative to the first slope portion in the radial direction and has a gradient of an inclination which is inclined toward the another side in the axial direction of the output shaft as the second slope portion approaches the outer side in the radial direction, wherein the gradient of the inclination of the second slope portion is within a second range that is different from the first range;
a plate thickness of the second slope portion is larger than a plate thickness of the first slope portion; and
the electric motor includes:
a rotor that is coupled to the output shaft to rotate together with the output shaft; and
a stator that is radially opposed to the rotor, wherein the stator includes a core having an axial end portion facing toward the boss in the axial direction, and an axial end portion of the second slope portion, which is opposite to the boss in the axial direction, is axially positioned further away from the boss than the axial end portion of the core, so that a center of gravity of the fan is placed closer to the electric motor than to the boss.