US 12,228,141 B2
Multi-blade centrifugal air-sending device
Hiroyasu Hayashi, Tokyo (JP); Takuya Teramoto, Tokyo (JP); Ryo Horie, Tokyo (JP); Takashi Yamaguchi, Tokyo (JP); Tomohiro Nagano, Tokyo (JP); Kazuya Michikami, Tokyo (JP); and Takahiro Yamatani, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 18/023,831
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Oct. 23, 2020, PCT No. PCT/JP2020/039891
§ 371(c)(1), (2) Date Feb. 28, 2023,
PCT Pub. No. WO2022/085174, PCT Pub. Date Apr. 28, 2022.
Prior Publication US 2023/0243365 A1, Aug. 3, 2023
Int. Cl. F04D 29/28 (2006.01); F04D 29/42 (2006.01)
CPC F04D 29/281 (2013.01) [F04D 29/4226 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A multi-blade centrifugal air-sending device comprising:
a fan including a back plate having a disk shape, a plurality of blades arranged at a peripheral portion of the back plate in a circumferential direction, and a rim having an annular shape and coupling the plurality of blades to each other, the plurality of blades being connected at respective first end portions on one side to the back plate, the rim being provided at respective second end portions of the plurality of blades on a side opposite to the one side where the respective first end portions are present; and
a scroll casing having a spiral shape and including a side wall which faces the fan and where an air inlet is provided and a peripheral wall, the scroll casing housing the fan such that the side wall faces the respective second end portions of the plurality of blades, the scroll casing being configured such that air is introduced through the air inlet and blown out to an outer peripheral side,
wherein each of the blades includes a sirocco blade portion constituted by a forward blade, and a turbo blade portion constituted by a rearward blade and provided on an inner peripheral side with respect to the sirocco blade portion,
wherein, in a side view, the respective second end portions of the blades each extend linearly along the side wall in a direction perpendicular to a rotational axis of the fan, and include an end surface of the sirocco blade portion and an end surface of the turbo blade portion, and
wherein each of the blades beyond inner peripheral ends of the side wall toward the inner peripheral side such that a portion of the end surface of the turbo blade portion is positioned on the inner peripheral side with respect to the inner peripheral ends of the side wall while a remaining portion of the end surface of the turbo blade portion is covered by the side wall.