US 11,808,465 B2
Outdoor unit of air conditioning apparatus
Naho Adachi, Tokyo (JP); and Takahide Tadokoro, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 17/635,440
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Oct. 26, 2020, PCT No. PCT/JP2020/040099
§ 371(c)(1), (2) Date Feb. 15, 2022,
PCT Pub. No. WO2021/085377, PCT Pub. Date May 6, 2021.
Claims priority of application No. PCT/JP2019/042324 (WO), filed on Oct. 29, 2019.
Prior Publication US 2022/0333794 A1, Oct. 20, 2022
Int. Cl. F24F 1/38 (2011.01); F24F 1/18 (2011.01)
CPC F24F 1/38 (2013.01) [F24F 1/18 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An outdoor unit of an air-conditioning apparatus, the outdoor unit comprising:
a heat exchanger;
an axial fan configured to generate a flow of air to be guided into the heat exchanger;
a housing having an opening through which the air passes, and housing the heat exchanger and housing the axial fan in a region located between the opening and the heat exchanger; and
a bell mouth having an annular shape, provided in the housing and around the axial fan, and configured to guide the air to the opening,
wherein the bell mouth includes
a first tapered portion formed such that an inside diameter of part of the first tapered portion which is located on an upstream side of the first tapered portion and into which the air flows is larger than an inside diameter of part of the first tapered portion which is located on a downstream side of the first tapered portion, and
a straight pipe portion linearly extending from the first tapered portion toward a downstream side,
the first tapered portion further includes
a first bent portion forming an inlet for the air,
a second bent portion continuous with the straight pipe portion, the second bent portion having an inside diameter smaller than an inside diameter of the first bent portion, and
a linking portion continuous with the first bent portion and the second bent portion, the linking portion having an inner surface extending linearly,
the inner surface of the linking portion is inclined at 33 degrees or more relative to a direction along an axis of the straight pipe portion, and
in the direction along the axis of the straight pipe portion, a ratio of a sum of a first length of the first tapered portion and a second length of the straight pipe portion to a total length of the bell mouth is less than 0.76.