An indoor unit for an air-conditioning apparatus includes a case, an air-sending fan, and a heat exchanger unit. The heat exchanger unit includes a plurality of heat-transfer pipes extending in a vertical direction and forming a plurality of refrigerant passages in a width direction of the case and an air flow direction, and a plurality of headers connected to both ends of the plurality of heat-transfer pipes to allow the refrigerant to flow between the plurality of heat-transfer pipes. The plurality of headers include a plurality of division headers dividing and connecting the plurality of heat-transfer pipes arranged in the air flow direction and connecting in parallel the plurality of heat-transfer pipes arranged in the width direction, and a return header connecting and turning back the plurality of divided refrigerant passages arranged in the air flow direction and connecting in parallel the plurality of heat-transfer pipes arranged in the width direction.

An air conditioner includes an air conditioner body including a cross-flow air duct and an air outlet in communication with the cross-flow air duct, a cross-flow impeller arranged at the cross-flow air duct and located upstream of the air outlet, and an air guide assembly including an air guide member rotatable around a pivot axis at the air outlet. The air conditioner body includes a first volute and a second volute arranged opposite to each other in a cross section perpendicular to a rotation axis of the cross-flow impeller. The cross-flow air duct is located between the first volute and the second volute. A set air duct is formed between the air guide member and the first volute when an air output volume of the air conditioner is maximum. A width of the set air duct in the cross section first increases and then decreases along an air output direction.

An air conditioner includes an air conditioner body including a cross-flow air duct and an air outlet in communication with the cross-flow air duct, a cross-flow impeller arranged at the cross-flow air duct and located upstream of the air outlet, and an air guide assembly including an air guide member rotatable around a pivot axis at the air outlet. The air conditioner body includes a first volute and a second volute arranged opposite to each other in a cross section perpendicular to a rotation axis of the cross-flow impeller. The cross-flow air duct is located between the first volute and the second volute. A set air duct is formed between the air guide member and the first volute when an air output volume of the air conditioner is maximum. A width of the set air duct in the cross section first increases and then decreases along an air output direction.

An air conditioner includes a main body that includes a suction port and an outlet port, wherein: the main body includes a front surface, a back surface, an upper surface, a lower surface, and a pair of side surfaces; the suction port is formed on any of the front surface, the upper surface, and the side surfaces; the outlet port is formed on at least the lower surface; an outlet air channel is upstream from the outlet port; a side of the outlet air channel near the front surface is formed by a diffuser; and the diffuser includes a portion that diverges from an imaginary straight line that constitutes a direction of extension of an upstream portion of the diffuser increasingly toward a downstream end of the diffuser in a side view.

A cross-flow fan includes a plurality of fan blades provided to be circumferentially spaced apart from each other. The fan blade has an inner edge portion arranged on the radially inner side to/from which air flows in/out, and an outer edge portion arranged on the radially outer side to/from which air flows in/out. Fan blade has a blade surface extending between the inner edge portion and the outer edge portion. The blade surface includes a pressure surface arranged on the rotation direction side of the cross-flow fan and a suction surface arranged on the back side of the pressure surface. When cut along a plane orthogonal to the rotation axis of the cross-flow fan, the fan blade has a blade cross-sectional shape in which a concave portion concave from the pressure surface is formed.

An indoor unit of an air conditioner includes a housing, a fan and a heat exchanger. The housing includes an upper base plate provided with an air inlet, a lower base plate detachably mounted to the upper base plate, and a front cover detachably mounted to the upper base plate; the fan is detachably mounted to the lower base plate; and the heat exchanger is detachably mounted to the upper base plate, in which the heat exchanger includes a supporting seat and a heat exchanger core body mounted to the supporting seat. The upper base plate is provided with a first positioning portion; the supporting seat is provided with a second positioning portion; and the first positioning portion cooperates with the second positioning portion to position the heat exchanger core body on the upper base plate.

In a known indoor unit, a casing may move away from a wall surface and a gap may be formed between the casing and the wall surface, with the result that the design of the indoor unit may be deteriorated. An indoor unit includes a mounting board fixed to a wall surface and a bottom frame (casing) attached to the mounting board. The bottom frame (casing) has screw holes (screw fixing portions) for fixing the bottom frame (casing) to the wall surface of the room.

An impeller element includes a plurality of blades disposed along an outer circumference of a circular support plate. Each blade is divided into a plurality of blade sections in a rotational axis direction. At least one of the divided blade sections as a long-chord blade section is configured such that a chord as a line segment connecting a blade outer-circumferential edge and a blade inner-circumferential edge of the blade in a cross section perpendicular to a rotational axis of the blade has a greater length than a chord of another one of the blade sections as a short-chord blade section. The blade inner-circumferential edge of the at least one long-chord blade section having the longer chord protrudes toward the inner circumferential side, relative to the blade inner-circumferential edge of the at least other one of the blade sections as the short-chord blade section having the shorter chord.

The length of a cross flow fan in the rotational axis direction is longer than the length of an air outlet in the longitudinal direction, and the cross flow fan has a fan extension positioned beyond each end of the air outlet in the rotational axis direction. Deflectors are provided in the air-conditioning apparatus main body. An outlet airflow blown from each fan extension of the cross flow fan impinges upon a corresponding one of the deflector. Furthermore, the shape of blade portions of the fan extensions of the cross flow fan and the shape of blade portions opposing the air outlet are different from each other. The wind speed of the outlet airflow blown from the blade portion is lower than the wind speed of an outlet airflow blown from the blade portion.

When a front panel moves away from a front surface of a casing, a central part of the front panel is warped. An indoor unit of the present invention includes a casing, a front panel provided forward of the casing, and a drive mechanism moving the front panel away from the front surface of the casing. The front panel is curved so that its central part protrudes forward. The drive mechanism moves the front panel in a substantially horizontal direction.