AU2018272237B2

AU2018272237B2 - Indoor unit for air conditioner

Info

Publication number: AU2018272237B2
Application number: AU2018272237A
Authority: AU
Inventors: Hirokazu DOI; Daisuke FUKAHORI; Yasuhiro Ohishi
Original assignee: Daikin Industries Ltd
Current assignee: Daikin Industries Ltd
Priority date: 2017-05-24
Filing date: 2018-04-03
Publication date: 2021-02-04
Anticipated expiration: 2038-04-03
Also published as: EP3614063B1; WO2018216359A1; CN110637200A; AU2018272237A1; JP2018197632A; CN110637200B; JP6477783B2; EP3614063A4; EP3614063A1

Abstract

This indoor unit for an air conditioner is provided with: a turbo fan (30) which is disposed in a casing, and which rotates in a prescribed rotation direction (arrow R1); a heat exchanger (40) which is disposed in the casing and around the turbo fan (30); and a partition plate (50) which connects the two ends of the heat exchanger (40), and which, along with the heat exchanger (40), surrounds the turbo fan (30). The centre O1 of the turbo fan (30) is positioned upstream of an orthogonal bisector L2 of a line L1 linking the two ends of the partition plate (50), in an air flow direction (arrow R2) between the turbo fan (30) and the partition plate (50). Accordingly, an indoor unit for an air conditioner is provided which is capable of reducing the pressure in a high pressure part generated at ends of the partition part covering an opening to the heat exchanger (40), and which is capable of inhibiting the occurrence of noise.

Description

DESCRIPTION TITLE OF INVENTION: INDOOR UNIT FOR AIR CONDITIONER TECHNICAL FIELD

[0001]

The present invention relates to an indoor unit for an air conditioner.

BACKGROUND ART

[0002]

A conventional indoor unit for an air conditioner includes a heat exchanger having a U

shape, a partition with which an opening of the heat exchanger is covered, and a turbo fan

surrounded with the heat exchanger and the partition and configured to suck in and blow out air

in two directions via the heat exchanger (see, for example, JP 2015-81692 A (Patent Literature

1).

[0003]

In the indoor unit for an air conditioner, the partition has a protrusion extending toward

the turbo fan, and the protrusion equalizes airflows directed to blow-out ports in the two

directions.

CITATION LIST PATENT LITERATURE

[0004]

Patent Literature 1: JP 2015-81692 A

SUMMARY OF INVENTION

[0005]

In the conventional indoor unit for an air conditioner, the turbo fan has a center located

on a center line of the heat exchanger and a center line of a casing main body, and each of the

heat exchanger and the partition has a laterally symmetrical shape. Accordingly, the left

airflow and the right airflow are different from each other although the turbo fan rotates in a single direction. Consequently, a high-pressure spot occurs at the partition, which makes unusual noise.

[0006]

It is an object of the present invention to substantially overcome, or at least ameliorate,

at least one disadvantage of present arrangements. Some embodiments of the present invention

set out to provide an indoor unit for an air conditioner, the indoor unit being capable of reducing

a pressure at a high-pressure spot that occurs at an end of a partition with which an opening of a

heat exchanger is covered, to thereby reduce unusual noise.

[0006a] One aspect of the present disclosure provides an indoor unit for an air conditioner,

comprising: a casing; a centrifugal fan disposed in the casing and configured to rotate in a

predetermined rotation direction; a heat exchanger disposed along a periphery of the centrifugal

fan) in the casing, the heat exchanger having a heat exchange part having a line symmetrical

shape in plan view; and a partition connected to two ends of the heat exchanger to surround the

centrifugal fan in conjunction with the heat exchanger, wherein the centrifugal fan has a center

located upstream of a current of air between the centrifugal fan and the partition, with respect to

a perpendicular bisector of a line connecting two ends of the partition, and the center of the

centrifugal fan is located upstream of the current of air between the centrifugal fan and the

partition, with respect to a symmetry axis of the heat exchange part of the heat exchanger.

[0007]

An aspect of the present invention provides an indoor unit for an air conditioner,

including:

a casing;

a centrifugal fan disposed in the casing and configured to rotate in a predetermined

rotation direction;

a heat exchanger disposed along a periphery of the centrifugal fan in the casing; and

a partition connected to two ends of the heat exchanger to surround the centrifugal fan

2a

in conjunction with the heat exchanger,

wherein

the centrifugal fan has a center located upstream of a current of air flowing

between the centrifugal fan and the partition, with respect to a perpendicular bisector of

a line connecting two ends of the partition.

[0008]

According to the configuration described above, the center of the centrifugal

fan configured to rotate in the predetermined rotation direction is located upstream of

the current of air between the centrifugal fan and the partition, with respect to the

perpendicular bisector of the line connecting the two ends of the partition.

Consequently, a clearance between an outer periphery of the centrifugal fan and the

downstream-side end of the partition with which an opening of the heat exchanger is

covered is larger than a clearance between the outer periphery of the centrifugal fan and

the upstream-side end of the partition. This configuration therefore enables reduction

in pressure near the downstream-side end of the partition that makes loud unusual noise.

This configuration thus enables reduction in pressure at a high-pressure spot that occurs

at the end of the partition with which the opening of the heat exchanger is covered, to

thereby reduce unusual noise.

[0009]

In the indoor unit for an air conditioner according to an embodiment,

the casing has a blow-out port at a position opposite to the partition with

respect to the heat exchanger.

[0010]

According to the embodiment described above, the casing has the blow-out

port at the position opposite to the partition with respect to the heat exchanger.

Therefore, air from the centrifugal fan is smoothly blown out through the blow-out port

via the heat exchanger.

[0011]

In the indoor unit for an air conditioner according to an embodiment,

the partition is bowed outward beyond the line connecting the two ends in plan

view, and the centrifugal fan partially overlaps a region surrounded with the partition and the line connecting the two ends of the partition.

[0012]

According to the embodiment described above, the partition is bowed outward

beyond the line connecting the two ends of the partition in plan view. In addition, the

centrifugal fan partially overlaps the region surrounded with the partition and the line

connecting the two ends of the partition. Therefore, the centrifugal fan rotates along

the partition bowed outward, and the partition smoothly guides air from the centrifugal

fan, which contributes to reduction in space for housing the components in the casing.

[0013]

In the indoor unit for an air conditioner according to an embodiment,

the heat exchanger includes:

a first heat exchange part,

a second heat exchange part located at an upstream side of the first heat

exchange part with respect to the rotation direction of the centrifugal fan in plan view,

and

a third heat exchange part located at a downstream side of the first heat

and

the third heat exchange part is shorter in length than the second heat exchange

part.

[0014]

According the embodiment described above, the third heat exchange part

located at the downstream side of the first heat exchange part with respect to the

rotation direction of the centrifugal fan is shorter in length than the second heat exchange part located at the upstream side of the first heat exchange part with respect to the rotation direction of the centrifugal fan. Therefore, pipe connection parts may be connected to an end of the third heat exchange part. In other words, a space for connecting pipes is ensured in the casing. As compared with a case where the third heat exchange part is equal in length to the second heat exchange part, the clearance between the outer periphery of the centrifugal fan and the downstream-side end of the partition is made larger than the clearance between the outer periphery of the centrifugal fan and the upstream-side end of the partition.

[0015]

As is clear from the foregoing description, according to the present invention, an indoor

unit for an air conditioner is arranged such that a centrifugal fan configured to rotate in a

predetermined rotation direction is disposed with a center thereof located upstream of a current

of air between the centrifugal fan and a partition, with respect to a perpendicular bisector of a

line connecting two ends of the partition, whereby it is possible to reduce a pressure at a high

pressure spot that may occur at an end of the partition with which an opening of a heat

exchanger is covered, to thereby reduce unusual noise.

BRIEF DESCRIPTION OF DRAWINGS

[0016]

FIG. 1 is a perspective view of an indoor unit for an air conditioner according to a first

embodiment of the present invention, the indoor unit being seen obliquely from below.

FIG. 2 is a perspective view of the indoor unit seen obliquely from above.

FIG. 3 is a bottom view of the indoor unit.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 3.

FIG. 5 is a bottom view of the indoor unit from which a panel, a drain pan, and

the like are detached.

FIG. 6 illustrates a center of a turbo fan in the indoor unit.

FIG. 7 illustrates the center of the turbo fan in the indoor unit.

FIG. 8 is a bottom view of the indoor unit which is illustrated in FIG. 5 and to

which a flap is attached.

FIG. 9 is a bottom view of the indoor unit from which the flap is detached.

FIG. 10 illustrates a pressure distribution in the indoor unit of the indoor unit

according to the first embodiment.

FIG. 11 illustrates the pressure distribution seen along line XI-XI in FIG. 10.

FIG. 12 is a bottom view of an indoor unit for an air conditioner according to a

second embodiment of the present invention in a state in which a panel, a drain pan, and

the like are detached from the indoor unit.

DESCRIPTION OF EMBODIMENTS

[0017]

A specific description will be given of an indoor unit for an air conditioner

according to the present invention, based on embodiments illustrated in the drawings.

[0018]

[First Embodiment]

FIG. 1 is a perspective view of an indoor unit for an air conditioner according

to a first embodiment of the present invention, the indoor unit being seen obliquely from

below. This indoor unit is designed to be embedded in a ceiling.

[0019]

As illustrated in FIG. 1, the indoor unit for an air conditioner according to the first embodiment includes a casing main body 1, a panel 2 having a rectangular shape, the panel 2 being mounted to a lower side of the casing main body 1, and a grille 3 detachably mounted to the panel 2. The casing main body 1, the panel 2, and the grille

3 constitute a casing.

[0020]

The panel 2 has, in its longitudinal end, a blow-out port 10 extending along a

shorter edge of the panel 2. The panel 2 also has a flap 20 pivotably mounted thereto.

In FIG. 1, the flap 20 closes the blow-out port 10.

[0021]

The indoor unit also includes a drain socket 7 protruding from a sidewall of the

casing main body 1. The drain socket 7 is connected to an external drain hose (not

illustrated). The indoor unit also includes pipe connection parts 5 and 6 each

protruding from the sidewall of the casing main body 1. Each of the pipe connection

parts 5 and 6 is connected to an external refrigerant pipe (not illustrated).

[0022]

As illustrated in FIG. 1, the indoor unit also includes an electrical component

unit 8 and hanger fittings 101 to 103 each protruding sideward from the casing main

body 1.

[0023]

FIG. 2 is a perspective view of the indoor unit seen obliquely from above. In

FIG. 2, the same constituent elements as those illustrated in FIG. 1 are denoted with the

same reference signs.

[0024]

FIG. 3 is a bottom view of the indoor unit. In FIG. 3, the same constituent

elements as those illustrated in FIG. 1 are denoted with the same reference signs.

[0025]

As illustrated in FIG. 3, the casing main body 1 has in its center a suction port

la. A filter 4 (see FIG. 4) is attached between the suction port la and the grille 3.

[0026]

FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. In FIG. 4, the

same constituent elements as those illustrated in FIGS. 1 to 3 are denoted with the same

reference signs.

[0027]

As illustrated in FIG. 4, the casing main body 1 houses therein a turbo fan 30 to

be driven by a motor 31. The casing main body 1 also houses therein a bell mouth 32

at a position between the suction port la and the turbo fan 30. The casing main body 1

also houses therein a heat exchanger 40 and a partition plate 50 at a position around the

turbo fan 30. The casing main body 1 also houses therein a drain pan 60 at a position

below the heat exchanger 40 and the partition plate 50.

[0028]

The turbo fan 30 is an example of a centrifugal fan. The partition plate 50 is

an example of a partition. The partition may be integrated with the casing.

[0029]

An air flow path P is provided within the casing main body 1 for guiding air

from the turbo fan 30 to the blow-out port 10 in the panel 2.

[0030]

FIG. 5 is a bottom view of the indoor unit from which the panel 2, the drain

pan 60, and the like are detached.

[0031]

As illustrated in FIG. 5, the casing main body 1 includes a first wall 11 located near the blow-out port 10 (see FIG. 9), a second wall 12 opposite to the first wall 11, a third wall 13 connecting the first wall 11 and the second wall 12, and a fourth wall 14 connecting the first wall 11 and the second wall 12 and opposite to the third wall 13.

[0032]

The heat exchanger 40 includes a first heat exchange part 41, a second heat

exchange part 42 located at an upstream side of the first heat exchange part 41 with

respect to a rotation direction (arrow R1) of the turbo fan 30 in plan view, and a third

heat exchange part 43 located at a downstream side of the first heat exchange part

41with respect to the rotation direction (arrow R1) of the turbo fan 30 in plan view.

[0033]

The heat exchanger 40 has two ends connected to the partition plate 50 having

an arcuate shape, so that the turbo fan 30 is surrounded with the heat exchanger 40 and

the partition plate 50. The partition plate 50 is bowed outward.

[0034]

The pipe connection parts 5 and 6 are connected to an end of the third heat

exchange part 43 of the heat exchanger 40. The casing main body 1 also houses

therein a drain pump 70 at a position between the partition plate 50 and the second wall

12 and near the third wall 13.

[0035]

FIG. 6 illustrates a center 01 of the turbo fan 30 in the indoor unit. The

center 01 of the turbo fan 30 is located upstream of a current of air (indicated by an

arrow R2) between the turbo fan 30 and the partition plate 50, with respect to a

perpendicular bisector L2 of a line Li connecting the two ends of the partition plate 50.

In other words, the center 01 of the turbo fan 30 is located on the left side of the

perpendicular bisector L2 in FIG. 6.

[0036]

The position of the center 01 of the turbo fan 30 is set as illustrated in FIG. 7.

The heat exchanger 40 includes a heat exchange part 40a (a hatched region in FIG. 7)

having a line symmetrical shape in plan view. The turbo fan 30 is disposed such that

the center 01 of the turbo fan 30 is located upstream of the current of air (indicated by

the arrow R2) between the turbo fan 30 and the partition plate 50, with respect to a

symmetry axis L3 of the heat exchange part 40a having the line symmetrical shape. In

other words, the turbo fan 30 is disposed such that the center 01 of the turbo fan 30 is

located on the left side of the symmetry axis L3 in FIG. 7.

[0037]

As to a positional relationship between the heat exchanger 40 and the casing

main body 1, desirably, the heat exchanger 40 is disposed in the casing main body 1

such that the symmetry axis L3 of the heat exchange part 40a having the line

symmetrical shape in the heat exchanger 40 is aligned with a longitudinal center line of

the casing main body 1.

[0038]

FIG. 8 illustrates the indoor unit which is illustrated in FIG. 5 and to which the

flap 20 (diagonally shaded) is attached. FIG. 9 illustrates the indoor unit from which

the flap 20 is detached. In FIGS. 8 and 9, the same constituent elements as those

illustrated in FIGS. 1 to 7 are denoted with the same reference signs.

[0039]

As illustrated in FIGS. 8 and 9, the heat exchanger 40 having a U shape in plan

view includes the first heat exchange part 41 extending in parallel with the first wall 11

of the casing main body 1, the second heat exchange part 42 seamlessly elongated from

a first end of the first heat exchange part 41, and the third heat exchange part 43 seamlessly elongated from a second end of the first heat exchange part 41.

[0040]

A clearance between the second heat exchange part 42 and the third wall 13 is

tapered from the first heat exchange part 41 toward a distal end, or tip, of the second

heat exchange part 42. A clearance between the third heat exchange part 43 and the

fourth wall 14 is tapered from the first heat exchange part 41 toward a distal end, or tip,

of the third heat exchange part 43. In other words, a distance between the second heat

exchange part 42 and the third heat exchange part 43 gradually increases toward the two

ends of the heat exchanger 40.

[0041]

As illustrated in FIG. 9, the blow-out port 10 includes a first blow-out port part

1a having a rectangular shape and extending along the first wall 11 (see FIG. 8) of the

casing main body 1, and second blow-out port parts1Gb respectively elongated from

two ends of the first blow-out port part 1Ga toward the second wall 12 (see FIG. 8) of

the casing main body 1.

[0042]

As illustrated in FIG. 8, the flap 20 configured to control a direction of air to be

blown out through the blow-out port 10 includes a flap main body 20a extending along

the first wall 11 of the casing main body 1, and auxiliaryflaps 20b respectively

elongated from two ends of the flap main body 20a toward the second wall 12 of the

casing main body 1.

[0043]

According to the indoor unit having the configuration described above, the

center 01 of the turbo fan 30 (centrifugal fan) configured to rotate in the predetermined

rotation direction (RI) is located upstream of the current of air (R2) between the turbo fan 30 and the partition plate 50, with respect to the perpendicular bisector L2 of the line Li connecting the two ends of the partition plate 50 (partition). Consequently, a clearance between an outer periphery of the turbo fan 30 and the downstream-side end of the partition plate 50 with which the opening of the heat exchanger 40 is covered is larger than a clearance between the outer periphery of the turbo fan 30 and the upstream-side end of the partition plate 50. This configuration therefore enables reduction in pressure near the downstream-side end of the partition plate 50 that makes loud unusual noise. This configuration thus enables reduction in pressure at a high pressure spot that may occur at the end of the partition plate 50 with which the opening of the heat exchanger 40 is covered, to thereby reduce unusual noise.

[0044]

The inventors of the present invention performed a simulation on the condition

that the center 01 of the turbo fan 30 is located upstream of the current of air (R2)

between the turbo fan 30 and the partition plate 50, with respect to the perpendicular

bisector L2 of the line L connecting the two ends of the partition plate 50. It was

confirmed by this simulation that the indoor unit having the configuration described

above reduces a pressure near the downstream-side end of the partition plate 50, and

therefore reduces a pressure at a high-pressure spot that occurs at the end of the partition

plate 50 with which the opening of the heat exchanger 40 is covered, to thereby reduce

unusual noise.

[0045]

FIG. 10 illustrates a pressure distribution obtained from the simulation

performed on the indoor unit according to the first embodiment. FIG. 11 illustrates the

pressure distribution seen along line XI-XI in FIG. 10. As illustrated in FIGS. 10 and

11, a pressure at a high-pressure spot is reduced, the high-pressure spot occurring near the downstream-side end of the partition plate 50 with which the opening of the heat exchanger 30 is covered.

[0046]

In addition, the panel 2 has the blow-out port 10 at the position opposite to the

partition plate 50 with respect to the heat exchanger 40. Therefore, air from the turbo

fan 30 is smoothly blown out through the blow-out port 10 via the heat exchanger 40.

[0047]

As illustrated in FIG. 6, the partition plate 50 is bowed outward beyond the line

Li connecting the two ends of the partition plate 50 (partition) in plan view. In

addition, the turbo fan 30 partially overlaps the region surrounded with the partition

plate 50 and the line L connecting the two ends of the partition plate 50 (partition).

Therefore, the turbo fan 30 rotates along the partition plate 50 bowed outward, and the

partition plate 50 smoothly guides air from the turbo fan 30. Also, reduction in space

for housing the components in the casing main body 1 is achievable.

[0048]

The third heat exchange part 43 elongated from the first heat exchange part 41

of the heat exchanger 40 at the downstream side in the rotation direction of the turbo fan

is shorter in length than the second heat exchange part 42 elongated from the first

heat exchange part 41 at the upstream side in the rotation direction of the turbo fan 30.

Therefore, the pipe connection parts 5 and 6 are connected to the end of the third heat

exchange part 43. In other words, a space for connecting pipes is ensured in the casing

main body 1. As compared with a case where the third heat exchange part 43 is equal

in length to the second heat exchange part 42, the clearance between the outer periphery

of the turbo fan 30 and the downstream-side end of the partition plate 50 is made larger

than the clearance between the outer periphery of the turbo fan 30 and the upstream-side end of the partition plate 50.

[0049]

In the first embodiment, the turbo fan 30 is a centrifugal fan. Alternatively,

the turbo fan 30 may by any centrifugal fan such as a sirocco fan.

[0050]

[Second Embodiment]

the like are detached from the indoor unit. The indoor unit for an air conditioner

according to the second embodiment is identical in configuration to the indoor unit for

an air conditioner according to the first embodiment except for a heat exchanger, and is

therefore described with also reference to FIGS. 1 to 9.

[0051]

As illustrated in FIG. 12, the indoor unit for an air conditioner according to the

second embodiment includes a heat exchanger 140 having a U shape in plan view. The

heat exchanger 140 includes a first heat exchange part 141 extending in parallel with a

first wall 11 of a casing main body 1, a second heat exchange part 142 elongated from a

first end of the first heat exchange part 141, and a third heat exchange part 143

elongated from a second end of the first heat exchange part 141. Thesecondheat

exchange part 142 extends in parallel with a second wall 12. The third heat exchange

part 143 extends in parallel with a third wall 13.

[0052]

The indoor unit for an air conditioner according to the second embodiment

produces effects similar to those of the indoor unit for an air conditioner according to

the first embodiment.

[0053]

Preferably, the second heat exchange part 142 and the third heat exchange part

143, which are respectively elongated from the two ends of the first heat exchange part

141, extend in parallel with each other irrespective of the shape of the casing main body.

[0054]

[Third Embodiment]

An indoor unit for an air conditioner according to a third embodiment of the

present invention is identical in configuration to the indoor unit for an air conditioner

according to the first embodiment except for a blow-out port, and is therefore described

with also reference to FIGS. 1 to 5.

[0055]

The indoor unit for an air conditioner according to the first embodiment has

one blow-out port 10 through which air is blown out in one direction. On the other

hand, the indoor unit for an air conditioner according to the third embodiment has blow

out ports through which air is blown out in three directions.

[0056]

Specifically, the indoor unit has a blow-out port 10 extending along a shorter

edge of a panel 2, and also has a second blow-out port and a third blow-out port

respectively extending along two opposite longer edges of the panel 2.

[0057]

The indoor unit for an air conditioner according to the third embodiment

the first embodiment.

[0058]

In the first to third embodiments, the casing of the indoor unit is constituted of the casing main body 1, the panel 2, and the grille 3; however, the shape of the casing is not limited thereto.

[0059]

Also in the first to third embodiments, the heat exchanger 40 of the indoor unit

has a U shape; however, the shape of the heat exchanger is not limited thereto.

Examples of the shape of the heat exchanger may include a circular arc shape, a V

shape, and the like.

[0060]

Also in the first to third embodiments, the indoor unit is designed to be

embedded in a ceiling; however, the indoor unit is not limited thereto. Alternatively,

the present invention is also applicable to, for example, an indoor unit designed to be

suspended from a ceiling.

[0061]

includes the first heat exchange part 41, the second heat exchange part 42 seamlessly

elongated from the first end of the first heat exchange part 41, and the third heat

exchange part 43 seamlessly elongated from the second end of the first heat exchange

part41. Alternatively, the present invention is also applicable to an indoor unit

including a heat exchanger 40 divided into different pieces of a first heat exchange part,

a second heat exchange part, and a third heat exchange part.

[0062]

The foregoing description concerns specific embodiments of the present

invention; however, the present invention is not limited to the first to third

embodiments, and various modifications and variations may be made within the scope

of the present invention. For example, an appropriate combination of the configurations described in the first to third embodiments may be regarded as an embodiment of the present invention.

REFERENCE SIGNS LIST

[0063]

1 casing main body

1a suction port

2 panel

3 grille

4 filter

5,6 pipe connection part

7 drain socket

8 electrical component unit

10 blow-out port

11 first wall

12 second wall

13 third wall

14 fourth wall

20 flap

30 turbo fan (centrifugal fan)

31 motor

32 bell mouth

40,140 heatexchanger

41, 141 first heat exchange part

42,142 second heat exchange part

43, 143 third heat exchange part partition plate (partition) drain pan drain pump

Claims

CLAIMS:

1. An indoor unit for an air conditioner, comprising: a casing; a centrifugal fan disposed in the casing and configured to rotate in a predetermined rotation direction; a heat exchanger disposed along a periphery of the centrifugal fan in the casing, the heat exchanger having a heat exchange part having a line symmetrical shape in plan view; and a partition connected to two ends of the heat exchanger to surround the centrifugal fan in conjunction with the heat exchanger, wherein the centrifugal fan has a center located upstream of a current of air between the centrifugal fan and the partition, with respect to a perpendicular bisector of a line connecting two ends of the partition, and the center of the centrifugal fan is located upstream of the current of air between the centrifugal fan and the partition, with respect to a symmetry axis of the heat exchange part of the heat exchanger.

2. The indoor unit for an air conditioner according to claim 1, wherein the casing has a blow-out port at a position opposite to the partition with respect to the heat exchanger.

3. The indoor unit for an air conditioner according to claim 1 or 2, wherein the partition is bowed outward beyond the line connecting the two ends of the partition in plan view, and the centrifugal fan partially overlaps a region surrounded with the partition and the line connecting the two ends of the partition.

4. The indoor unit for an air conditioner according to any one of claims I to 3, wherein the heat exchanger includes: a first heat exchange part, a second heat exchange part located at an upstream side of the first heat exchange part with respect to the rotation direction of the centrifugal fan in plan view, and a third heat exchange part located at a downstream side of the first heat exchange part with respect to the rotation direction of the centrifugal fan in plan view, and the third heat exchange part is shorter in length than the second heat exchange part.

Daikin Industries, Ltd. Patent Attorneys for the Applicant SPRUSON&FERGUSON