U.S. patent application number 14/442844 was filed with the patent office on 2015-10-22 for indoor unit of air-conditioning apparatus.
The applicant listed for this patent is MITSUBISHI ELECTRIC CORPORATION. Invention is credited to Seiji Hirakawa, Takuya Niimura.
Application Number | 20150300681 14/442844 |
Document ID | / |
Family ID | 50768128 |
Filed Date | 2015-10-22 |
United States Patent
Application |
20150300681 |
Kind Code |
A1 |
Hirakawa; Seiji ; et
al. |
October 22, 2015 |
INDOOR UNIT OF AIR-CONDITIONING APPARATUS
Abstract
A cross-flow fan, a heat exchanger provided so as to surround an
upper side and a front side of the cross-flow fan, and a nozzle
which is located at a lower side of the front heat exchanger
located at the front side of the cross-flow fan and is provided to
face the cross-flow fan, are included. The nozzle includes a drain
pan which receives dew condensation water generated at the heat
exchanger and a drain groove into which the dew condensation water
flows.
Inventors: |
Hirakawa; Seiji; (Tokyo,
JP) ; Niimura; Takuya; (Tokyo, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
MITSUBISHI ELECTRIC CORPORATION |
Chiyoda-ku, Tokyo |
|
JP |
|
|
Family ID: |
50768128 |
Appl. No.: |
14/442844 |
Filed: |
September 3, 2013 |
PCT Filed: |
September 3, 2013 |
PCT NO: |
PCT/JP2013/073632 |
371 Date: |
May 14, 2015 |
Current U.S.
Class: |
165/121 |
Current CPC
Class: |
F24F 1/0057 20190201;
F24F 7/007 20130101; F24F 13/222 20130101; F24F 5/0007 20130101;
F24F 13/22 20130101 |
International
Class: |
F24F 13/22 20060101
F24F013/22; F24F 5/00 20060101 F24F005/00; F24F 7/007 20060101
F24F007/007 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 13, 2012 |
JP |
2012-272281 |
Claims
1. An indoor unit of an air-conditioning apparatus comprising: a
fan; a heat exchanger provided so as to surround an upper side and
a front side of the fan; and a nozzle located below the heat
exchanger located at the front side of the fan, the nozzle being
provided to face the fan, wherein the nozzle includes a drain pan
configured to receive dew condensation water generated at the heat
exchanger; and a drain groove into which the dew condensation water
flows.
2. The indoor unit of an air-conditioning apparatus of claim 1,
wherein the drain pan and the drain groove are continuously formed
by an upper surface of the nozzle, and the drain pan is located at
the fan side with respect to the drain groove.
3. The indoor unit of an air-conditioning apparatus of claim 1,
wherein the drain pan is inclined downward toward the drain
groove.
4. The indoor unit of an air-conditioning apparatus of claim 3,
wherein the drain pan has an inclination angle equal to or greater
than 2 degrees.
5. The indoor unit of an air-conditioning apparatus of claim 1,
wherein the drain groove has a depth equal to or larger than 2% of
a horizontal width dimension of the indoor unit.
6. The indoor unit of an air-conditioning apparatus of claim 1,
wherein a boundary between the drain groove and the drain pan has a
shape curved so as to be convex toward the heat exchanger.
7. The indoor unit of an air-conditioning apparatus of claim 1,
wherein the boundary between the drain groove and the drain pan is
located at a side opposite to the fan with respect to a position
directly below the heat exchanger.
8. The indoor unit of an air-conditioning apparatus of claim 1,
wherein a heat transfer tube of the heat exchanger is formed of
aluminum.
9. The indoor unit of an air-conditioning apparatus of claim 2,
wherein the drain pan is inclined downward toward the drain
groove
10. The indoor unit of an air-conditioning apparatus of claim 9,
wherein the drain pan has an inclination angle equal to or greater
than 2 degrees.
Description
TECHNICAL FIELD
[0001] The present invention relates to an indoor unit of an
air-conditioning apparatus, and particularly relates to the shape
of a nozzle.
BACKGROUND ART
[0002] There is an existing indoor unit of an air-conditioning
apparatus in which an a drain pan having substantially a U
cross-sectional shape is disposed so as to surround a lower portion
of a heat exchanger, and the drain pan includes a drain pan body
and a drain pan heat insulating member disposed along an inner wall
of the drain pan body (see Patent Literature 1).
CITATION LIST
Patent Literature
[0003] Patent Literature 1: Japanese Unexamined Patent Application
Publication No. 2006-300431 (e.g., see FIG. 1).
SUMMARY OF INVENTION
Technical Problem
[0004] In such a type of an existing indoor unit of an
air-conditioning apparatus, since the drain pan has substantially a
U cross-sectional shape, dew condensation water generated during
cooling operation or dehumidifying operation accumulates in the
drain pan and the lower portion of the heat exchanger is likely to
be immersed in the water. Thus, if the amount of dew condensation
is large, the lower portion of the heat exchanger is immersed in
water, causing a decrease in heat exchange efficiency. In addition,
since the drain pan heat insulating member is disposed along the
inner wall of the drain pan body, the drain pan heat insulating
member is required to have the same area as that of the inner wall
of the drain pan body. This increases the cost.
[0005] The present invention has been made in order to solve the
problem described above, and an object of the present invention is
to provide an indoor unit of an air-conditioning apparatus which
indoor unit prevents a lower portion of a heat exchanger from being
immersed in water to decrease heat exchange efficiency.
Solution to Problem
[0006] An indoor unit of an air-conditioning apparatus according to
the present invention includes: a fan; a heat exchanger provided so
as to surround an upper side and a front side of the fan; and a
nozzle located below the heat exchanger located at the front side
of the fan, the nozzle being provided to face the fan. The nozzle
includes: a drain pan configured to receive dew condensation water
generated at the heat exchanger; and a drain groove into which the
dew condensation water flows.
Advantageous Effects of Invention
[0007] According to the indoor unit of an air-conditioning
apparatus according to the present invention, since the drain
groove into which the dew condensation water generated at the heat
exchanger flows is formed in the nozzle, it is possible to prevent
a lower portion of the heat exchanger from being immersed in water
to decrease heat exchange efficiency.
BRIEF DESCRIPTION OF DRAWINGS
[0008] FIG. 1 is a cross-sectional view of an indoor unit of an
air-conditioning apparatus according to Embodiment of the present
invention.
[0009] FIG. 2 is a perspective view of the entirety of the indoor
unit of an air-conditioning apparatus according to Embodiment of
the present invention.
[0010] FIG. 3 is a schematic view of a principal part of the indoor
unit of an air-conditioning apparatus according to Embodiment of
the present invention.
[0011] FIG. 4 is a perspective view of a stabilizer of the indoor
unit of an air-conditioning apparatus according to Embodiment of
the present invention.
[0012] FIG. 5 is an enlarged view of a principal part of FIG.
4.
DESCRIPTION OF EMBODIMENTS
[0013] Hereinafter, Embodiment of the present invention will be
described with reference to the drawings.
[0014] FIG. 1 is a cross-sectional view of an indoor unit of an
air-conditioning apparatus according to Embodiment of the present
invention, and FIG. 2 is a perspective view of the entirety of the
indoor unit of an air-conditioning apparatus according to
Embodiment of the present invention.
[0015] The indoor unit 1 of an air-conditioning apparatus according
to Embodiment includes air inlets 4 which are provided at a front
upper side and surrounded by a design grille 2 and a panel 3. In
addition, the indoor unit 1 includes an air outlet 6 which is
provided at a front lower side and has an opening which is
regulated in direction and size by a vertical wind direction
variable vane 5. A wind path is formed within the indoor unit 1 so
as to extend from the air inlets 4 to the air outlet 6.
[0016] On the wind path, a pre-filter 7 which removes foreign
matter in air in a room, a heat exchanger 8 which exchanges heat
with air in the room, a cross-flow fan 9, and a lateral wind
direction variable vane 15 are provided. An air suction wind path
10 is formed at the upstream side (upper side) of the cross-flow
fan 9 so as to be surrounded by the heat exchanger 8 and the
cross-flow fan 9, and a blowout wind path 13 is formed at the
downstream side (lower side) of the cross-flow fan 9 so as to be
defined by a nozzle 11 and a box portion 12. The lateral wind
direction variable vane 15 is provided on the blowout wind path 13
and changes a wind direction laterally. In addition, the pre-filter
7 is provided between the air inlets 4 and the heat exchanger 8 so
as to cover the heat exchanger 8, and has a function to collect
dust which has entered through the air inlets 4 together with air,
before the dust enters the heat exchanger 8.
[0017] For the heat exchanger 8, a portion located in front of the
cross-flow fan 9 is referred to as front heat exchanger 8a.
[0018] In addition, the nozzle 11 (11a to 11e) and a stabilizer 14
(14a to 14h) will be described later.
[0019] FIG. 3 is a schematic view of a principal part of the indoor
unit of an air-conditioning apparatus according to Embodiment of
the present invention.
[0020] As shown in FIG. 3, the nozzle 11 is located below the front
heat exchanger 8a and extends from the design grille 2 toward the
cross-flow fan 9. The upper surface (the heat exchanger 8 side) of
the nozzle 11 forms a drain pan 11a from a portion thereof located
substantially directly below the front heat exchanger 8a toward the
cross-flow fan 9, and receives dew condensation water generated at
the heat exchanger 8 during cooling operation or dehumidifying
operation. A portion of the drain pan 11a is provided with a nozzle
projection 11d which projects toward the front heat exchanger 8a
located at the upper side. The nozzle projection 11d is provided so
as to ensure a desired distance between the nozzle 11 and the front
heat exchanger 8a to make a lower portion of the front heat
exchanger 8a less likely to be immersed in dew condensation water
dropped on the drain pan 11a, and also serves as a mark for
positioning a later-described cushioning material when the
cushioning material is attached between the drain pan 11a and the
front heat exchanger 8a.
[0021] Also, in a portion of the nozzle 11 at the design grille 2
side with respect to the drain pan 11a has a drain groove 11e which
is formed so as to project downward and into which dew condensation
water dropped on the drain pan 11a flows. That is, the drain pan
11a and the drain groove 11e are continuously formed by the upper
surface of the nozzle 11, and the drain pan 11a is located at the
cross-flow fan 9 side with respect to the drain groove 11e. Dew
condensation water is caused to flow from the drain pan 11a to the
drain groove 11e and accumulate therein. This causes the lower
portion of the front heat exchanger 8a to be less likely to be
immersed in water. Thus, the drain pan 11a is inclined downward
toward the drain groove 11e in order that dew condensation water
dropped thereon easily flows into the drain groove 11e.
[0022] A nozzle cover 11c is mounted at the lower surface of the
nozzle 11 (at the side opposite to the heat exchanger 8) via an air
layer 11b and forms a part of the blowout wind path 13. Thus, the
air layer 11b is present between the drain pan 11a and the nozzle
cover 11c and serves as a heat insulating layer. Therefore, even
when the drain pan 11a is cooled by dew condensation water
generated at the heat exchanger 8, the nozzle cover 11c is less
likely to cause dew condensation thereon.
[0023] However, if the air layer 11b is incompletely sealed, dew
condensation water accumulates in the drain groove 11e, thus a
portion around the drain groove 11e is cooled, and dew condensation
intensively forms on the back surface of the drain groove 11e.
Then, when dew condensation water generated due to the dew
condensation drops on the upper surface of the nozzle cover 11c,
the nozzle cover 11c is cooled, and dew condensation easily forms
thereon to generate dew condensation water on the lower surface of
the nozzle cover 11c. When the dew condensation water generated
thus drops around the air outlet 6 below the nozzle cover 11c, dew
is scattered into the room by wind blown out from the air outlet
6.
[0024] In such a case, it is possible to prevent drop of dew
condensation water on the upper surface of the nozzle cover 11c, by
attaching at least either one of a heat insulating material and a
water absorbing material (hereinafter, referred to as a heat
insulating material or the like) on the back surface of the drain
groove 11e. Thus, it is possible to prevent generation of dew
condensation water on the lower surface of the nozzle cover 11c. If
the nozzle 11 is configured without the drain groove 11e, it is
necessary to attach a heat insulating material or the like on the
entirety of the back surface of the drain pan 11a. However, in
Embodiment, since there is the drain groove 11e, it is simply
necessary to attach a heat insulating material or the like only on
the back surface of the drain groove 11e, thereby decreasing the
area where the heat insulating material or the like is attached as
compared to the case without the drain groove 11e. Thus, it is
possible to take a countermeasure against scattering of dew while
reducing the cost.
[0025] The stabilizer 14 is provided on a surface of the nozzle 11
that is opposed to the cross-flow fan 9, and along a portion of the
outer periphery of the cross-flow fan 9. An end portion 14b is
provided at the boundary between the stabilizer 14 and the nozzle
11, and a projection 14a is provided at a portion extending
downward from the end portion 14b along the outer periphery of the
cross-flow fan 9 and determines a minimum distance from the
cross-flow fan 9. A first recess portion 14c is formed between the
projection 14a and the end portion 14b so as to be continuous in
the longitudinal direction of the cross-flow fan 9 and have a
recess shape. Furthermore, a second recess portion 14d is formed at
a lower portion of the first recess portion 14c so as to be
continuous in the longitudinal direction of the cross-flow fan 9
and have a recess shape.
[0026] FIG. 4 is a perspective view of the stabilizer of the indoor
unit of an air-conditioning apparatus according to Embodiment of
the present invention, and FIG. 5 is an enlarged view of a
principal part of FIG. 4.
[0027] At the boundary between the stabilizer 14 and the blowout
wind path 13, the stabilizer 14 is provided with an R portion 14g
which is curved so as to be convex toward the cross-flow fan 9, and
a plurality of vertical grooves 14e are formed in the R portion 14g
so as to be aligned in the longitudinal direction of the cross-flow
fan 9. Vertical groove ribs 14f are provided in the plurality of
vertical grooves 14e such that their positions are regularly varied
along the outer periphery of the cross-flow fan 9 in an oblique
direction. Third recess portions 14h are formed by the vertical
groove ribs 14f partially filling the vertical grooves 14e.
[0028] Next, an operation during cooling operation or dehumidifying
operation of the indoor unit 1 of an air-conditioning apparatus
according to Embodiment will be described.
[0029] When the indoor unit 1 is powered on with a remote
controller or the like which is not shown and cooling operation or
dehumidifying operation is selected, a refrigerant becomes a
high-temperature and high-pressure refrigerant by a compressor
which is not shown and then is discharged therefrom. The
refrigerant becomes a low-temperature and low-pressure refrigerant
by flowing through a condenser and an expansion valve which are not
shown, and then flows into the heat exchanger 8. Meanwhile, when
the cross-flow fan 9 rotates, dust is removed by the pre-filter 7
from air in the room that has been sucked through the air inlets 4,
and then the air flows into the heat exchanger 8. The air exchanges
heat with the refrigerant within the heat exchanger 8 and then is
blown out through the air outlet 6 into the room. At that time, the
air is blown out to a direction corresponding to the positions of
the vertical wind direction variable vane 5 and the lateral wind
direction variable vane 15. The user is allowed to set the
positions of the vertical wind direction variable vane 5 and the
lateral wind direction variable vane 15 manually or automatically
with the remote controller.
[0030] Thereafter, the air in the room is sucked through the air
inlets 4 again and the series of operations is repeated. As a
result, dust is removed from the air in the room and the air is
cooled, and thus the quality of the air is changed.
[0031] When the air in the room flows through the heat exchanger 8
to be cooled or dehumidified, water vapor in the air forms dew
condensation at the heat exchanger 8, and dew condensation water
drops on the drain pan 11a. Thereafter, the dropped dew
condensation water is introduced to the drain groove 11e due to the
inclination of the drain pan 11a and discharged out of the room
through a drain hose which is mounted to a drain hose mount portion
16 and is not shown. At that time, if the depth of the drain groove
11e is small, the dew condensation water overflows therefrom, so
that the lower portion of the front heat exchanger 8a is immersed
in the dew condensation water. Accordingly, the air in the room
cannot pass through the immersed lower portion, thereby decreasing
the heat exchange efficiency. Thus, it is necessary to make the
depth of the drain groove 11e sufficiently large.
[0032] As shown in FIG. 4, the drain hose mount portion 16 is
present at both left and right sides, a drain hose is connected to
either one of the drain hose mount portions 16 depending on an
installation environment, and a rubber stopper is connected to the
other drain hose mount portion 16. If the indoor unit 1 is inclined
laterally due to distortion of a wall surface on which the indoor
unit 1 is installed, deformation of a mount metal fitting, an
improper installation operation, or the like, the drain hose mount
portion 16 to which the drain hose is connected may be located at a
higher position than the lowest point of the drain groove 11e. If
so, dew condensation water stored in the drain groove 11e is not
discharged to the outside through the drain hose. Even in such a
case, it is necessary to make the depth of the drain groove 11e
sufficiently large to prevent dew condensation water from
overflowing from the drain groove 11e to immerse the lower portion
of the front heat exchanger 8a in the dew condensation water. It is
recognized from actual measurement or the like that when the depth
of the drain groove 11e is equal to or larger than 2% of the
horizontal width dimension of the indoor unit 1, even if a lateral
inclination is 1.1 degrees, it is possible to prevent overflow of
dew condensation water, and it is possible to cover most of
installation states.
[0033] In addition, even if the indoor unit 1 is inclined
frontward, it is possible to introduce dew condensation water to
the drain groove 11e by sufficiently inclining the drain pan 11a.
It is recognized from actual measurement or the like that when an
inclination angle downward to the drain groove 11e is equal to or
greater than 2 degrees, it is possible to cover most of
installation states.
[0034] With the above configuration, the lower portion of the front
heat exchanger 8a is not immersed in dew condensation water. Thus,
the air in the room is allowed to pass also through the lower
portion of the front heat exchanger 8a, and the heat exchange
efficiency is not decreased during cooling operation and during
dehumidifying operation.
[0035] Moreover, since the boundary between the drain groove 11e
and the drain pan 11a has a shape curved so as to be convex toward
the front heat exchanger 8a, when dew condensation water flows
through the drain groove 11e, the dew condensation water flows
along the surface of the curved shape. Thus, it is possible to make
it less likely to generate dropping sound produced by dropped dew
condensation water and water stored in the drain groove 11e when
the dew condensation water drops to the drain groove 11e.
[0036] In Embodiment, as shown in FIG. 1, the boundary between the
drain groove 11e and the drain pan 11a is located directly below
the front heat exchanger 8a, and thus a portion of the drain groove
11e is also located directly below the front heat exchanger 8a.
Therefore, the boundary between the drain groove 11e and the drain
pan 11a is located at the design grille 2 side with respect to the
position directly below the heat exchanger 8, and the drain groove
11e is formed such that there is no portion of the drain groove 11e
that is located directly below the front heat exchanger 8a.
Accordingly, it is possible to prevent dew condensation water from
dropping from the front heat exchanger 8a directly to the drain
groove 11e. As a result, it is possible to make it further less
likely to generate dropping sound.
[0037] During cooling operation or during dehumidifying operation,
if the gap between the drain pan 11a and the front heat exchanger
8a (or the nozzle projection 11d) is opened wide, the volume of
high-temperature humid air that does not flow through the heat
exchanger 8 and passes through the gap from the front side of the
indoor unit 1 to the back side thereof (hereinafter, referred to as
secondary air) is increased. Then, the secondary air is cooled when
passing through the end portion 14b of the stabilizer 14,
generating dew condensation water on the end portion 14b. If the
volume of the dew condensation water is increased, the dew
condensation water overflows from the end portion 14b to the
vicinity of the air outlet 6, and dew is scattered into the room by
wind blown out from the air outlet 6.
[0038] Therefore, in order to reduce the secondary air which causes
dew condensation on the end portion 14b, it is necessary to
decrease the gap between the drain pan 11a and the front heat
exchanger 8a (or the nozzle projection 11d), and it is recognized
from actual measurement or the like that the gap is desirably equal
to or less than 2 mm. The gap between the drain pan 11a and the
front heat exchanger 8a may be sealed by a cushioning material
interposed therebetween.
[0039] By so doing, the volume of the secondary air is decreased,
thus it is possible to reduce the volume of dew condensation water
which is generated on the end portion 14b, and dew condensation
water is less likely to overflow from the end portion 14b.
Therefore, it is possible to prevent occurrence of scattering of
dew.
[0040] Even if dew condensation water is generated on the end
portion 14b, since the first recess portion 14c is formed between
the projection 14a and the end portion 14b so as to be continuous
in the longitudinal direction of the cross-flow fan 9, the first
recess portion 14c is able to receive the dew condensation water.
Furthermore, since the recess-shaped second recess portion 14d is
formed at the lower portion of the first recess portion 14c so as
to be continuous in the longitudinal direction of the cross-flow
fan 9, even if dew condensation water overflows from the first
recess portion 14c, the second recess portion 14d is able to
receive the dew condensation water. Moreover, the plurality of
vertical grooves 14e are formed in the R portion 14g, the vertical
groove ribs 14f are provided in the plurality of vertical grooves
14e such that their positions are regularly varied along the outer
periphery of the cross-flow fan 9 in the oblique direction, and the
third recess portions 14h are formed by the vertical groove ribs
14f partially filling the vertical grooves 14e. Thus, the third
recess portions 14h are also able to receive overflowing dew
condensation water. As described above, the stabilizer 14 has three
types of recess portions, the first recess portion 14c, the second
recess portion 14d, and the third recess portions 14h, and is
structured to triply receive dew condensation water. Thus, it is
possible to prevent dew condensation water from overflowing from
the stabilizer 14 to the vicinity of the air outlet 6 to cause
scattering of dew into the room by wind blown out from the air
outlet 6. It should be noted that dew condensation water stored in
the three types of recess portions evaporates during low-load
operation or during stop of operation.
[0041] As described above, since the stabilizer 14 has three types
of recess portions, the three types of recess portions are able to
store dew condensation water generated within the indoor unit 1
during cooling operation or during dehumidifying operation, and the
dew condensation water is prevented from dropping to the vicinity
of the air outlet 6. Thus, it is possible to prevent occurrence of
scattering of dew into the room caused by wind blown out from the
air outlet 6.
[0042] In addition, since the gap between the drain pan 11a and the
front heat exchanger 8a (or the nozzle projection 11d) is made
equal to or less than 2 mm, the volume of the secondary air is
decreased, the volume of dew condensation water generated on the
end portion 14b is decreased, and dew condensation water is made
less likely to overflow from the end portion 14b. Thus, it is
possible to prevent occurrence of scattering of dew.
[0043] The nozzle cover 11c is mounted at the lower surface of the
nozzle 11 via the air layer 11b, whereby the air layer 11b between
the drain pan 11a and the nozzle cover 11c becomes a heat
insulating layer. Thus, it is possible to prevent generation of dew
condensation water on the lower surface of the nozzle cover 11c,
dropping of the dew condensation water to the vicinity of the air
outlet 6, and occurrence of scattering of dew into the room by wind
blown out from the air outlet 6.
[0044] Even if the air layer 11b is not completely sealed, it is
possible to prevent generation of dew condensation water on the
lower surface of the nozzle cover 11c, by attaching a heat
insulating material or the like only to the back surface of the
drain groove 11e. Thus, it is possible to take a countermeasure
against scattering of dew while reducing the cost.
[0045] The drain pan 11a and the drain groove 11e are formed in the
nozzle 11, and the drain pan 11a is inclined downward toward the
drain groove 11e, so that dew condensation water is caused to flow
from the drain pan 11a into the drain groove 11e and accumulate
therein. This causes the lower portion of the front heat exchanger
8a to be less likely to be immersed in water.
[0046] Even if the indoor unit 1 is inclined laterally so that dew
condensation water stored in the drain groove 11e is not discharged
through the drain hose to the outside, it is possible to prevent
overflow of dew condensation water in most of installation states
by making the depth of the drain groove 11e equal to or larger than
2% of the vertical width dimension of the indoor unit 1.
[0047] Even if the indoor unit 1 is inclined frontward, it is
possible to introduce dew condensation water to the drain groove
11e in most of installation states by making the inclination angle
of the drain pan 11a equal to or greater than 2 degrees.
[0048] With the configuration described above, it is possible to
prevent the lower portion of the front heat exchanger 8a from being
immersed in dew condensation water to decrease the heat exchange
efficiency.
[0049] Since the boundary between the drain groove 11e and the
drain pan 11a has a shape curved so as to be convex toward the
front heat exchanger 8a, dew condensation water flows along the
surface of the curved shape. Thus, it is possible to make it less
likely to generate dropping sound when dew condensation water drops
to the drain groove 11e.
[0050] The drain groove 11e is formed such that there is no portion
of the drain groove 11e that is located directly below the heat
exchanger 8, whereby it is possible to prevent dew condensation
water from dropping from the heat exchanger 8 directly to the drain
groove 11e, and it is possible to make it further less likely to
generate dropping sound.
[0051] Regarding the heat exchanger 8, a heat transfer tube which
is not shown may be formed of aluminum.
[0052] In an existing indoor unit 1, copper is used for the heat
transfer tube of the heat exchanger 8, but by forming the heat
transfer tube from aluminum, it is possible to configure the heat
exchanger 8 at reduced cost. In addition, since aluminum is more
susceptible to corrosion than copper, it is necessary to take a
countermeasure against corrosion on the assumption that the lower
portion of the front heat exchanger 8a is immersed in water. Thus,
it is necessary to take cost for the countermeasure against
corrosion. However, in Embodiment, the lower portion of the front
heat exchanger 8a is less likely to be immersed in dew condensation
water, and thus it is possible to increase the resistance of the
aluminum heat transfer tube to corrosion. As a result, the cost
taken for the countermeasure against corrosion is reduced.
REFERENCE SIGN LIST
[0053] 1 indoor unit [0054] 2 design grille [0055] 3 panel [0056] 4
air inlet [0057] 5 vertical wind direction variable vane [0058] 6
air outlet [0059] 7 pre-filter [0060] 8 heat exchanger [0061] 8a
front heat exchanger [0062] 9 cross-flow fan [0063] 10 suction wind
path [0064] 11 nozzle [0065] 11a drain pan [0066] 11b air layer
[0067] 11c nozzle cover [0068] 11d nozzle projection [0069] 11e
drain groove [0070] 12 box portion [0071] 13 blowout wind path
[0072] 14 stabilizer [0073] 14a projection [0074] 14b end portion
[0075] 14c first recess portion [0076] 14d second recess portion
[0077] 14e vertical groove [0078] 14f vertical groove rib [0079]
14g R portion [0080] 14h third recess portion [0081] 15 lateral
wind direction variable vane [0082] 16 drain hose mount portion
* * * * *