Outdoor unit for air-conditioning apparatus

An outdoor unit for an air-conditioning apparatus, comprising:

• a heat exchanger;
• an axial flow fan configured to generate flow of air passing through the heat exchanger;
• a casing having an opening through which the air passes, the casing accommodating the heat exchanger, and accommodating the axial flow fan between the opening and the heat exchanger;
• and
• a bellmouth having an annular shape and provided around the axial flow fan inside the casing to guide the air into the opening of the casing,
• the bellmouth having
• a first tapered portion in which an inner diameter of an upstream side of the first tapered portion from which the air flows in is larger than an inner diameter of a downstream side of the first tapered portion, and
• a straight pipe portion extending straight from the first tapered portion to the downstream side of the flow of the air,
• wherein
• the first tapered portion includes
• a first bend portion forming an inlet for the air,
• a second bend portion connecting to the straight pipe portion and having an inner diameter smaller than that of the first bend portion, and
• a connection portion connecting to the first bend portion and the second bend portion and having an inner surface extending straight, and
• a length of at least a part of the first tapered portion along an axial direction of the straight pipe portion is larger than a length of the straight pipe portion along the axial direction of the straight pipe portion,
• wherein the second curvature radius of the second bend portion varies in a circumferential direction of the bellmouth.