U.S. patent application number 13/979108 was filed with the patent office on 2013-10-31 for heat exchanger and air conditioner.
This patent application is currently assigned to DAIKIN INDUSTRIES, LTD.. The applicant listed for this patent is Masanori Jindou, Yoshio Oritani, Shun Yoshioka. Invention is credited to Masanori Jindou, Yoshio Oritani, Shun Yoshioka.
Application Number | 20130284416 13/979108 |
Document ID | / |
Family ID | 46515549 |
Filed Date | 2013-10-31 |
United States Patent
Application |
20130284416 |
Kind Code |
A1 |
Jindou; Masanori ; et
al. |
October 31, 2013 |
HEAT EXCHANGER AND AIR CONDITIONER
Abstract
A heat exchanger has a plurality of flat tubes, and a plurality
of fins in which the flat tubes are inserted in an orthogonal
direction. Each of the fins includes a fin body, and an attachment
portion to which the flat tube is attached. The fin body includes
an insertion region in which the flat tube is inserted, and an
extension region on the downwind side of the insertion region. A
spacer configured to keep a space between the fins is formed in
each of the insertion region and the extension region by cutting
and bending part of the fin. The spacer of the extension region is
straight behind the spacer of the insertion region on the downwind
side. The spacer of the insertion region is configured such that
the spacer body is tilted with respect to an airflow.
Inventors: |
Jindou; Masanori; (Osaka,
JP) ; Oritani; Yoshio; (Osaka, JP) ; Yoshioka;
Shun; (Osaka, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Jindou; Masanori
Oritani; Yoshio
Yoshioka; Shun |
Osaka
Osaka
Osaka |
|
JP
JP
JP |
|
|
Assignee: |
DAIKIN INDUSTRIES, LTD.
Osaka-shi, Osaka
JP
|
Family ID: |
46515549 |
Appl. No.: |
13/979108 |
Filed: |
January 23, 2012 |
PCT Filed: |
January 23, 2012 |
PCT NO: |
PCT/JP2012/000383 |
371 Date: |
July 10, 2013 |
Current U.S.
Class: |
165/181 |
Current CPC
Class: |
F28F 2215/12 20130101;
F28F 1/325 20130101; F28F 1/12 20130101; F28F 1/022 20130101 |
Class at
Publication: |
165/181 |
International
Class: |
F28F 1/12 20060101
F28F001/12 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 21, 2011 |
JP |
2011 011299 |
Claims
1. A heat exchanger, comprising: a plurality of flat tubes arranged
in parallel; and a plurality of plate-like fins each extending in
an arrangement direction of the flat tubes, and having a cutout to
which each of the flat tubes is inserted in an orthogonal
direction, wherein each of the fins includes a plate-like fin body,
and an attachment portion with which a corresponding one of the
flat tubes is brought into contact and to which the flat tube is
attached, and the fin body includes a plate-like main body, and a
plurality of spacers which are formed by bending part of the fin
body, continuous with the main body, and keep a space between the
fins.
2. The heat exchanger of claim 1, wherein the fin body has an
insertion region to which the flat tube is inserted, and an
extension region continuous with one end of the insertion region in
an airflow direction and connecting the insertion regions together,
and the spacers are formed in both of the insertion region and the
extension region.
3. The heat exchanger of claim 2, wherein each of the fins is
configured such that air flows from the insertion region to the
extension region, and the spacer of the extension region is
straight behind the spacer of the insertion region on a downwind
side of the spacer of the insertion region.
4. The heat exchanger of claim 2, wherein each of the fins is
configured such that air flows from the insertion region to the
extension region, and the spacer of the extension region is behind
the flat tube.
5. The heat exchanger of claim 3, wherein the spacer of the
insertion region includes a flat plate-like spacer body bent to a
right angle from the fin body, and the spacer of the insertion
region is tilted with respect to an airflow.
6. The heat exchanger of claim 3, wherein each of the spacers is
formed by cutting and bending part of the fin body.
7. The heat exchanger of claim 6, wherein the spacer of the
insertion region is cut and bent from a upwind side to a downwind
side, and the spacer of the extension region is cut and bent from
the downwind side to the upwind side.
8. The heat exchanger of claim 3, wherein the insertion region
includes an intermediate region located between the flat tubes, and
a projection region projecting toward the upwind side from the
intermediate region so as to be away from the extension region, and
the spacer of the insertion region is provided in the projection
region at a middle portion through which a middle line between the
flat tubes passes.
9. The heat exchanger of claim 2 wherein the insertion region
includes an intermediate region located between the flat tubes, and
a projection region projecting toward the upwind side from the
intermediate region so as to be away from the extension region, and
the spacer of the insertion region is bent from an edge of the
projection region which is a parallel edge (43b) parallel to the
airflow.
10. The heat exchanger of claim 9, wherein the spacer of the
insertion region includes a flat plate-like spacer body bent to a
right angle from the fin body, and the spacer of the insertion
region is parallel to the airflow.
11. The heat exchanger of claim 1, wherein each of the spacers is
in a trapezoidal shape, and a tip of the spacer is a long side of
the trapezoidal shape.
12. The heat exchanger of claim 1, wherein each of the spacers is
provided with a rib extending in a projection direction of the
spacer.
13. The heat exchanger of claim 12, wherein the rib extends from
the main body of the fin body to the spacer.
14. The heat exchanger of claim 6, wherein a tip of each of the
spacers is off a hole that is formed in adjacent one of the fin
bodies as a result of cutting and bending corresponding one of the
spacers in the adjacent fin body.
15. An air conditioner, comprising a refrigerant circuit in which
the heat exchanger of claim 1 is provided, wherein the refrigerant
circuit performs a refrigeration cycle by circulating a
refrigerant.
16. The heat exchanger of claim 4, wherein the spacer of the
insertion region includes a flat plate-like spacer body bent to a
right angle from the fin body, and the spacer of the insertion
region is tilted with respect to an airflow.
17. The heat exchanger of claim 4, wherein each of the spacers is
formed by cutting and bending part of the fin body.
18. The heat exchanger of claim 5, wherein each of the spacers is
formed by cutting and bending part of the fin body.
19. The heat exchanger of claim 4, wherein the insertion region
includes an intermediate region located between the flat tubes, and
a projection region projecting toward the upwind side from the
intermediate region so as to be away from the extension region, and
the spacer of the insertion region is provided in the projection
region at a middle portion through which a middle line between the
flat tubes passes.
20. The heat exchanger of claim 5, wherein the insertion region
includes an intermediate region located between the flat tubes, and
a projection region projecting toward the upwind side from the
intermediate region so as to be away from the extension region, and
the spacer of the insertion region is provided in the projection
region at a middle portion through which a middle line between the
flat tubes passes.
Description
TECHNICAL FIELD
[0001] The present invention relates to heat exchangers having a
flat tube and fins and configured to exchange heat between a fluid
flowing in the flat tube and air, and air conditioners having the
heat exchangers, and specifically relates to measures for keeping a
space between the fins of the heat exchanger.
BACKGROUND ART
[0002] Heat exchangers having a flat tube and a fin have been
known. For example, Patent Document 1 shows a heat exchanger in
which a plurality of flat tubes, each extending in a horizontal
direction, are arranged one above another with a predetermined
space between the flat tubes, and plate-like fins are arranged in
an extension direction of the flat tubes, with a predetermined
space between the fins. Air flowing in contact with the fins
exchanges heat with a fluid flowing in the flat tubes.
[0003] In this heat exchanger, an insertion portion of the fin in
which the flat tube is inserted is provided with a fin collar, and
a predetermined space is kept between the fins due to the fin
collar.
CITATION LIST
Patent Document
[0004] Patent Document 1: Japanese Patent Publication No.
2010-054060
SUMMARY OF THE INVENTION
Technical Problem
[0005] In the conventional heat exchangers, the fin collar is
formed by bending a portion of the fin which corresponds to a tube
insertion portion in which the flat tube is inserted.
[0006] However, if the flat tube has a small thickness, the tube
insertion portion of the fin has a narrow width as well, which may
result in a situation where it is impossible to form a fin collar
with a height that corresponds to the space between the fins by
simply bending a portion of the fin that corresponds to the tube
insertion portion thereof.
[0007] The present invention is thus intended to make it possible
to keep a predetermined space between a plurality of fins.
Solution to the Problem
[0008] The first aspect of the present invention is a heat
exchanger, including: a plurality of flat tubes (33) arranged in
parallel such that side surfaces thereof face each other; and a
plurality of plate-like fins (36) each extending in an arrangement
direction of the flat tubes (33), and having a cutout (45) to which
each of the flat tubes (33) is inserted in an orthogonal direction.
In the first aspect of the present invention, each of the fins (36)
includes a plate-like fin body (36a), and an attachment portion
(36b) with which a corresponding one of the flat tubes (33) is
brought into contact and to which the flat tube (33) is attached,
and the fin body (36a) includes a plate-like main body (36c), and a
plurality of spacers (48) which are formed by bending part of the
fin body (36a), continuous with the main body (36c), and keep a
space between the fins (36).
[0009] According to the first aspect of the present invention, the
spacer (48) is formed by bending part of the fin body (36a). Thus,
the spacer (48) has a sufficient height, and a predetermined space
is kept between the fins (36).
[0010] The second aspect of the present invention is that in the
first aspect of the present invention, the fin body (36a) has an
insertion region (40) to which the flat tube (33) is inserted, and
an extension region (41) continuous with one end of the insertion
region (40) in an airflow direction and connecting the insertion
regions (40) together, and the spacers (48) are formed in both of
the insertion region (40) and the extension region (41).
[0011] According to the second aspect of the present invention, the
spacers (48) are formed in the insertion region (40) and the
extension region (41). Thus, a predetermined space is kept between
the fins (36).
[0012] The third aspect of the present invention is that in the
second aspect of the present invention, each of the fins (36) is
configured such that air flows from the insertion region (40) to
the extension region (41), and the spacer (48) of the extension
region (41) is straight behind the spacer (48) of the insertion
region (40) on a downwind side of the spacer (48) of the insertion
region (40).
[0013] According to the third aspect of the present invention, the
spacer (48) of the extension region (41) is straight behind the
spacer (48) of the insertion region (40) on the downwind side of
the spacer (48) of the insertion region (40). Thus, there is less
effect on the spacer (48) of the extension region (41) by the
airflow, and the airflow is less likely blocked.
[0014] The fourth aspect of the present invention is that in the
second aspect of the present invention, each of the fins (36) is
configured such that air flows from the insertion region (40) to
the extension region (41), and the spacer (48) of the extension
region (41) is behind the flat tube (33).
[0015] According to the fourth aspect of the present invention, the
spacer (48) is located in the dead water region behind the flat
tube (33). Thus, the airflow is not blocked.
[0016] The fifth aspect of the present invention is that in any one
of the second to fourth aspects of the present invention, the
spacer (48) of the insertion region (40) includes a flat plate-like
spacer body (48a) bent to a right angle from the fin body (36a),
and the spacer (48) of the insertion region (40) is tilted with
respect to an airflow.
[0017] According to the fifth aspect of the present invention, the
spacer (48) is tilted with respect to the airflow. Thus, the air
resistance is reduced.
[0018] The sixth aspect of the present invention is that in the
third or the fourth aspect of the present invention, each of the
spacers (48) is formed by cutting and bending part of the fin body
(36a).
[0019] According to the sixth aspect of the present invention, the
spacer (48) is formed by cutting and bending part of the fin body
(36a). Thus, no separate member is necessary to form the spacer
(48).
[0020] The seventh aspect of the present invention is that in the
sixth aspect of the present invention, the spacer (48) of the
insertion region (40) is cut and bent from a upwind side to a
downwind side, and the spacer (48) of the extension region (41) is
cut and bent from the downwind side to the upwind side.
[0021] According to the seventh aspect of the present invention,
the space between the spacer (48) of the insertion region (40) and
the spacer (48) of the extension region (41) is reduced, and the
space between the fins (36) is reliably kept.
[0022] The eighth aspect of the present invention is that in any
one of the second to seventh aspects of the present invention, the
insertion region (40) includes an intermediate region (42) located
between the flat tubes (33), and a projection region (43)
projecting toward the upwind side from the intermediate region (42)
so as to be away from the extension region (41), and the spacer
(48) of the insertion region (40) is provided in the projection
region (43) at a middle portion through which a middle line between
the flat tubes (33) passes.
[0023] According to the eighth aspect of the present invention, the
spacer (48) of the insertion region (40) is located at a middle
portion between the flat tubes (33). Thus, the space between the
fins (36) is reliably kept.
[0024] The ninth aspect of the present invention is that in the
second or fourth aspect of the present invention, the insertion
region (40) includes an intermediate region (42) located between
the flat tubes (33), and a projection region (43) projecting toward
the upwind side from the intermediate region (42) so as to be away
from the extension region (41), and the spacer (48) of the
insertion region (40) is bent from an edge of the projection region
(43) which is a parallel edge (43b) parallel to the airflow.
[0025] According to the ninth aspect of the present invention, the
spacer (48) is formed at a parallel edge (43b) of the projection
region (43) which is parallel to the airflow. Thus, the airflow is
not blocked, and the air resistance is significantly reduced.
[0026] The tenth aspect of the present invention is that in the
ninth aspect of the present invention, the spacer (48) of the
insertion region (40) includes a flat plate-like spacer body (48a)
bent to a right angle from the fin body (36a), and the spacer (48)
of the insertion region (40) is parallel to the airflow.
[0027] According to the tenth aspect of the present invention, the
spacer (48) is in parallel to the airflow. Thus, the airflow is not
blocked, and the air resistance is significantly reduced.
[0028] The eleventh aspect of the present invention is that in any
one of the first to tenth aspects of the present invention, each of
the spacers (48) is in a trapezoidal shape, and a tip of the spacer
(48) is a long side of the trapezoidal shape.
[0029] According to the eleventh aspect of the present invention,
the tip of the spacer (48) is a long side of a trapezoidal shape.
Thus, a sufficient contact area with the adjacent fin (36) is
ensured.
[0030] The twelfth aspect of the present invention is that in any
one of the first to eleventh aspects of the present invention, each
of the spacers (48) is provided with a rib (48d) extending in a
projection direction of the spacer (48).
[0031] According to the twelfth aspect of the present invention,
the spacer (48) is provided with the rib (48d). Thus, the proof
strength of the spacer (48) is improved.
[0032] The thirteenth aspect of the present invention is that in
the twelfth aspect of the present invention, the rib (48d) extends
from the main body (36c) of the fin body (36a) to the spacer
(48).
[0033] According to the thirteenth aspect of the present invention,
the rib (48d) extends from the main body (36c) of the fin body
(36a) to the spacer (48). Thus, the strength of the bent portion
(48c) of the spacer (48) is increased.
[0034] The fourteenth aspect of the present invention is that in
any one of the sixth to eighth aspects of the present invention, a
tip of each of the spacers (48) is off a hole (36d) that is formed
in adjacent one of the fin bodies (36a) as a result of cutting and
bending corresponding one of the spacers (48) in the adjacent fin
body (36a).
[0035] According to the fourteenth aspect of the present invention,
the tip of the spacer (48) is off the hole (36d) formed in the
adjacent fin body (36a), and thus, the tip of the spacer (48) does
not fit into the hole (36d) formed in the adjacent fin body
(36a).
[0036] The fifteenth aspect of the present invention is directed to
an air conditioner (10) including a refrigerant circuit (20) in
which the heat exchanger (30) of any one of the first to fourteenth
aspects of the present invention is provided, wherein the
refrigerant circuit (20) performs a refrigeration cycle by
circulating a refrigerant.
[0037] According to the fifteenth aspect of the present invention,
the heat exchanger (30) of any one of the first to fourteenth
aspects of the present invention is connected to the refrigerant
circuit (20). In the heat exchanger (30), the refrigerant
circulating in the refrigerant circuit (20) flows in the path (34)
of the flat tube (33), and exchanges heat with the air, for
example.
ADVANTAGES OF THE INVENTION
[0038] In the present invention, part of the fin body (36a) is bent
to form the spacer (48). Thus, the spacer (48) may have a
sufficient height, and a predetermined space can be kept between
the fins (36).
[0039] In the second aspect of the present invention, the spacers
(48) are formed in the insertion region (40) and the extension
region (41) of the fin body (36a). Thus, a predetermined space
between the fins (36) can be reliably kept throughout the fins
(36).
[0040] In the third aspect of the present invention, the spacer
(48) of the extension region (41) is straight behind the spacer
(48) of the insertion region (40) on the downwind side of the
spacer (48) of the insertion region (40). Thus, there is less
effect on the spacer (48) of the extension region (41) by the
airflow, and it is possible to reduce blocking of the airflow.
[0041] In the fourth aspect of the present invention, the spacer
(48) is located in the dead water region behind the flat tube (33).
Thus, the airflow is not blocked.
[0042] In the fifth aspect of the present invention, the spacer
(48) is tilted with respect to the airflow. Thus, the air
resistance is reliably reduced.
[0043] In the sixth aspect of the present invention, part of the
fin body (36a) is cut and bent to form the spacer (48). Thus, no
separate member is necessary to form the spacer (48), and the
structure can be simplified.
[0044] In the seventh aspect of the present invention, the spacer
(48) of the insertion region (40) is cut and bent from the upwind
side to the downwind side, and the spacer (48) of the extension
region (41) is cut and bent from the downwind side to the upwind
side. Thus, the space between the spacer (48) of the insertion
region (40) and the spacer (48) of the extension region (41) can be
reduced, and the space between the fins (36) is reliably kept.
[0045] In the eighth aspect of the present invention, the spacer
(48) of the insertion region (40) is provided in the projection
region (43) at a middle portion through which a middle line between
the flat tubes (33) passes. Thus, the space between the fins (36)
can be reliably kept.
[0046] In the ninth aspect of the present invention, the spacer
(48) is formed at the parallel edge (43b) of the projection region
(43) which is parallel to the airflow. Thus, the airflow is not
blocked, and the air resistance is significantly reduced. In
particular, the spacer (48) can be formed by using a portion to be
removed in the formation of the fin (36). It is thus possible to
provide the spacer (48) with efficiency.
[0047] In the tenth aspect of the present invention, the spacer
(48) is in parallel to the airflow. Thus, the airflow is less
blocked, and the air resistance can be further reduced.
[0048] In the eleventh aspect of the present invention, the tip of
the spacer (48) is a long side of a trapezoidal shape. Thus, a
sufficient contact area with the adjacent fin (36) is ensured, and
a predetermined space between the fins (36) can be reliably
kept.
[0049] In the twelfth aspect of the present invention, the spacer
(48) is provided with the rib (48d). Thus, the proof strength of
the spacer (48) can be improved. As a result, deformation of the
spacer (48) can be reliably prevented, and therefore, a
predetermined space between the fins (36) can be reliably kept.
[0050] In the thirteen aspect of the present invention, the rib
(48d) extends from the main body (36c) of the fin body (36a) to the
spacer (48). Thus, the strength of the bent portion (48c) is
increased, and inclination of the spacer (48) can be reliably
prevented.
[0051] In the fourteenth aspect of the present invention, the tip
of the spacer (48) is off the hole (36d) formed in the adjacent fin
body (36a) as a result of cutting and bending the corresponding
spacer (48) in the adjacent fin body (36a). Thus, the tip does not
fit into the hole (36d) of the adjacent fin body (36a). As a
result, the spacer (48) can keep the predetermined space between
the fins (36) with reliability.
BRIEF DESCRIPTION OF THE DRAWINGS
[0052] FIG. 1 is a refrigerant circuit diagram showing a schematic
configuration of an air conditioner of the first embodiment.
[0053] FIG. 2 is an oblique view schematically showing the heat
exchanger of the first embodiment.
[0054] FIG. 3 is a partial cross-sectional view of the front side
of the heat exchanger of the first embodiment.
[0055] FIG. 4 is a cross-sectional view of part of the heat
exchanger taken along the line A-A of FIG. 3.
[0056] FIG. 5 is a front view of a main part of a fin of the heat
exchanger of the first embodiment.
[0057] FIG. 6 is a cross-sectional view taken along the line B-B of
FIG. 5.
[0058] FIG. 7 is a cross-sectional view of a plurality of fins of
the first embodiment.
[0059] FIG. 8 shows the front side of a spacer.
[0060] FIG. 9 is a front view of a main part of a fin of a heat
exchanger of the second embodiment.
[0061] FIG. 10 is a cross-sectional view of the fin of the second
embodiment.
[0062] FIG. 11 is a front view of a main part of a fin of the third
embodiment.
[0063] FIG. 12 is an oblique view of a main part of a fin before
cutting and bending a spacer of the fourth embodiment.
[0064] FIG. 13 is an oblique view of the main part of the fin after
cutting and bending the spacer of the fourth embodiment.
[0065] FIG. 14 is a plan view of the spacer of the fourth
embodiment.
[0066] FIG. 15 is a cross-sectional view of a spacer of the fifth
embodiment.
[0067] FIG. 16 is a front view of a main part of a fin of the sixth
embodiment.
DESCRIPTION OF EMBODIMENTS
[0068] Embodiments of the present invention will be described in
detail below based on the drawings.
First Embodiment of Invention
[0069] A heat exchanger (30) of the first embodiment comprises an
outdoor heat exchanger (23) of an air conditioner (10).
[0070] The air conditioner (10) having the heat exchanger (30) of
the present embodiment will be described with reference to FIG.
1.
[0071] --Configuration of Air Conditioner--
[0072] The air conditioner (10) has an outdoor unit (11) and an
indoor unit (12). The outdoor unit (11) and the indoor unit (12)
are connected to each other via a liquid communication pipe (13)
and a gas communication pipe (14). A refrigerant circuit (20) is
formed by the outdoor unit (11), the indoor unit (12), the liquid
communication pipe (13), and the gas communication pipe (14).
[0073] The refrigerant circuit (20) includes a compressor (21), a
four-way valve (22), an outdoor heat exchanger (23), an expansion
valve (24), and an indoor heat exchanger (25). The compressor (21),
the four-way valve (22), the outdoor heat exchanger (23), and the
expansion valve (24) are accommodated in the outdoor unit (11). The
outdoor unit (11) is provided with an outdoor fan (15) configured
to supply outdoor air to the outdoor heat exchanger (23). The
indoor heat exchanger (25) is accommodated in the indoor unit (12).
The indoor unit (12) is provided with an indoor fan (16) configured
to supply indoor air to the indoor heat exchanger (25).
[0074] A discharge side of the compressor (21) is connected to a
first port of the four-way valve (22), and a suction side of the
compressor (21) is connected to a second port of the four-way valve
(22). In the refrigerant circuit (20), the outdoor heat exchanger
(23), the expansion valve (24), and the indoor heat exchanger (25)
are provided sequentially from a third port to a fourth port of the
four-way valve (22).
[0075] The compressor (21) is a scroll type or rotary type hermetic
compressor. The four-way valve (22) switches between a first state
(the state shown in broken line in FIG. 1) in which the first port
communicates with the third port, and the second port communicates
with the fourth port, and a second state (the state shown in solid
line in FIG. 1) in which the first port communicates with the
fourth port, and the second port communicates with the third port.
The expansion valve (24) is a so-called electronic expansion valve
(24).
[0076] In the outdoor heat exchanger (23), the outdoor air is heat
exchanged with the refrigerant. The outdoor heat exchanger (23) is
comprised of the heat exchanger (30) of the present embodiment. In
the indoor heat exchanger (25), the indoor air is heat exchanged
with the refrigerant. The indoor heat exchanger (25) is comprised
of a so-called cross-fin type fin-and-tube heat exchanger having a
circular heat-transfer tube.
[0077] --Cooling Operation--
[0078] The air conditioner (10) performs a cooling operation. The
four-way valve (22) is set to the first state during the cooling
operation. The outdoor fan (15) and the indoor fan (16) are driven
during the cooling operation.
[0079] The refrigerant circuit (20) performs a refrigeration cycle.
Specifically, the refrigerant discharged from the compressor (21)
passes through the four-way valve (22), flows into the outdoor heat
exchanger (23), and dissipates heat to the outdoor air and
condenses. The refrigerant flowing out of the outdoor heat
exchanger (23) expands when it passes through the expansion valve
(24), flows into the indoor heat exchanger (25), and takes heat
from the indoor air and evaporates. The refrigerant flowing out of
the indoor heat exchanger (25) passes through the four-way valve
(22) and is then sucked into the compressor (21) and compressed.
The indoor unit (12) supplies air which has been cooled in the
indoor heat exchanger (25) to an indoor space.
[0080] --Heating Operation--
[0081] The air conditioner (10) performs a heating operation. The
four-way valve (22) is set to the second state during the heating
operation. The outdoor fan (15) and the indoor fan (16) are driven
during the heating operation.
[0082] The refrigerant circuit (20) performs a refrigeration cycle.
Specifically, the refrigerant discharged from the compressor (21)
passes the four-way valve (22), flows into the indoor heat
exchanger (25), and dissipates heat to the indoor air and
condenses. The refrigerant flowing out of the indoor heat exchanger
(25) expands when it passes through the expansion valve (24), flows
into the outdoor heat exchanger (23), and takes heat from the
outdoor air and evaporates. The refrigerant flowing out of the
outdoor heat exchanger (23) passes through the four-way valve (22)
and is then sucked into the compressor (21) and compressed. The
indoor unit (12) supplies air which has been heated in the indoor
heat exchanger (25) to an indoor space.
[0083] --Defrosting Operation--
[0084] As described above, the outdoor heat exchanger (23)
functions as an evaporator in the heating operation. In the
operation under low outdoor air temperature conditions, the
evaporation temperature of the refrigerant in the outdoor heat
exchanger (23) may sometimes be below 0.degree. C. In this case,
the moisture in the outdoor air turns into frost and adheres to the
outdoor heat exchanger (23). To avoid this, the air conditioner
(10) performs a defrosting operation every time a duration of the
heating operation reaches a predetermined value (e.g., several tens
of minutes), for example.
[0085] To start the defrosting operation, the four-way valve (22)
is switched from the second state to the first state, and the
outdoor fan (15) and the indoor fan (16) are stopped. In the
refrigerant circuit (20) during the defrosting operation, a high
temperature refrigerant discharged from the compressor (21) is
supplied to the outdoor heat exchanger (23). The frost adhering to
the surface of the outdoor heat exchanger (23) is heated and melted
by the refrigerant. The refrigerant which dissipates heat in the
outdoor heat exchanger (23) sequentially passes through the
expansion valve (24) and the indoor heat exchanger (25), and is
then sucked into the compressor (21) and compressed. When the
defrosting operation is finished, the heating operation starts
again. That is, the four-way valve (22) is switched from the first
state to the second state, and the outdoor fan (15) and the indoor
fan (16) are driven again.
[0086] --Configuration of Heat Exchanger--
[0087] The heat exchanger (30) of the present embodiment which
comprises the outdoor heat exchanger (23) of the air conditioner
(10) will be described with reference to FIGS. 2 to 8.
[0088] As shown in FIG. 2 and FIG. 3, the heat exchanger (30)
includes one first header collecting pipe (31), one second header
collecting pipe (32), a plurality of flat tubes (33), and a
plurality of fins (36). The first header collecting pipe (31), the
second header collecting pipe (32), the flat tubes (33), and the
fins (36) are all aluminum alloy members, and are attached to one
another with solder. The flat tubes (33) and the fins (36) are
provided such that the width direction thereof is along the
airflow, and the flat tubes (33) and the fins (36) are arranged to
be orthogonal to each other in a grid pattern.
[0089] Both of the first header collecting pipe (31) and the second
header collecting pipe (32) are in an elongated cylindrical shape.
One of the first header collecting pipe (31) and the second header
collecting pipe (32) is provided at the left end of the heat
exchanger (30), and the other is provided at the right end of the
heat exchanger (30). As shown in FIG. 4, each of the flat tubes
(33) is a heat-transfer tube having a flat cross section, and the
flat tubes (33) are arranged one above another such that the flat
surfaces thereof face each other. Each flat tube (33) has a
plurality of fluid passages (34). One end of each of the flat tubes
(33) arranged one above another is inserted in the first header
collecting pipe (31), and the other end is inserted in the second
header collecting pipe (32).
[0090] Each fin (36) is in a plate-like shape, and the fins (36)
are arranged in an extension direction of the flat tube (33) with a
predetermined space between the fins (36). In other words, the fins
(36) are arranged to be substantially orthogonal to the extension
direction of the flat tube (33).
[0091] As shown in FIG. 5, each fin (36) is in an elongated
plate-like shape formed by pressing a metal plate. The fin (36)
includes a plate-like fin body (36a) and an attachment portion
(36b) by which the flat tube (33) is attached to the fin body
(36a).
[0092] That is, the fin (36) is provided with a plurality of
elongated cutouts (45) each extending in a width direction of the
fin (36) from a leading edge (39) of the fin (36), and
corresponding to the flat tubes (33). The plurality of cutouts (45)
are formed in the fin (36) at predetermined intervals in a
longitudinal direction (i.e., a vertical direction) of the fin
(36). The cutouts (45) are configured such that the flat tubes (33)
are inserted therein. A downwind portion of the cutout (45)
comprises a tube insertion portion (46) in which the flat tube (33)
is inserted. A width of the tube insertion portion (46) in the
vertical direction is substantially equal to the thickness of the
flat tube (33), and a length of the tube insertion portion (46) is
substantially equal to the width of the flat tube (33).
[0093] An edge portion of the tube insertion portion (46) of the
fin (36) serves as the attachment portion (36b). Specifically, the
edge portion of the tube insertion portion (46) is provided with a
collar to serve as the attachment portion (36b). The flat tube (33)
is inserted in the tube insertion portion (46) to be in contact
with the attachment portion (36b), and is attached to the
attachment portion (36b) with solder, thereby attaching the flat
tube (33) to the fin body (36a).
[0094] The fin body (36a) includes an insertion region (40) into
which the flat tube (33) is inserted, and an extension region (41)
that is continuous with one end, in the airflow direction, of each
insertion region (40) and connecting the insertion regions (40).
That is, the insertion region (40) is located on the upwind side of
the air, and the extension region (41) is located on the downwind
side of the insertion region (40).
[0095] The insertion region (40) includes an intermediate region
(42) located between the flat tubes (33), and a projection region
(43) which projects from the intermediate region (42) in a
direction away from the extension region (41). That is, the
projection region (43) is on the most upwind side of the air; the
intermediate region (42) is located on the downwind side of the
projection region (43); and the extension region (41) is located on
the downwind side of the intermediate region (42).
[0096] A plurality of louvers (50) are provided in the insertion
region (40) and the extension region (41) of the fin body (36a).
Each of the louvers (50) comprises a heat-transfer promotion
portion, and is formed by cutting and bending part of the insertion
region (40) and the extension region (41) as shown in FIG. 6 and
FIG. 7. That is, the louvers (50) are formed by giving a plurality
of slit-like cuts in the insertion region (40) and the extension
region (41) and plastically deforming a portion between adjacent
cuts as if twisting the portion.
[0097] The longitudinal direction of each louver (50) is
substantially parallel to the leading edge (38) of the projection
region (43). That is, the longitudinal direction of each louver
(50) is the vertical direction. The plurality of louvers (50) are
arranged next to each other from the upwind side to the downwind
side.
[0098] A water-conducting rib (71) is formed in the extension
region (41) of the fin body (36a). The water-conducting rib (71) is
an elongated recessed groove extending vertically along a downwind
side edge of the extension region (41). The water-conducting rib
(71) extends from the upper end to the lower end of the extension
region (41).
[0099] The fin body (36a) is provided with a spacer (48) configured
to keep a space between adjacent fins (36).
[0100] As shown in FIG. 4 to FIG. 7, the spacer (48) is provided in
each of the extension region (41) of the fin body (36a) and the
projection region (43) of the insertion region (40). The spacer
(48) of the extension region (41) corresponds to the tube insertion
portion (46), and one spacer (48) is located behind each of the
flat tubes (33), that is, located on the downwind side of the flat
tube (33). The spacer (48) of the insertion region (40) is provided
such that one spacer (48) is located in each of the projection
regions (43) at a position on the upwind side of the most upwind
side louver (50) and a middle portion of the projection region
(43). That is, the spacer (48) of the insertion region (40) is
located in the projection region (43) at a middle portion through
which a middle line between the flat tubes (33) passes. The middle
portion includes a portion that is on the middle line between the
flat tubes (33), and also a portion that is off the middle line to
a certain extent.
[0101] The spacer (48) is formed by bending part of the fin body
(36a), specifically by cutting and bending part of the fin body
(36a). That is, the fin body (36a) includes a plate-like main body
(36c) having the insertion region (40) and the extension region
(41), and the spacer (48) continuous with the main body (36c). The
spacer (48) is raised at a right angle from the main body (36c) of
the fin body (36a) via a bent portion (48c). On the other hand, a
hole (36d) is formed in the fin body (36a) as a result of cutting
and bending the spacer (48).
[0102] As shown in FIG. 8, the spacer (48) is comprised of a flat
plate-like spacer body (48a) bent at a right angle from the fin
body (36a), and an arc-shaped curved portion (48b) at the tip of
the spacer body (48a). The spacer (48) has a trapezoidal shape in
which the tip thereof, i.e., the edge of the curved portion (48b)
is the long side. Further, the tip of the spacer (48) is off the
hole (36d) that is formed in the adjacent fin body (36a) as a
result of cutting and bending a corresponding spacer (48) in the
adjacent fin body (36a). The spacer (48) is configured such that
the tip is in contact with the main body (36c) of the adjacent fin
body (36a) at a location near the hole (36d).
[0103] The spacer (48) of the extension region (41) is formed in a
dead water region formed by the flat tube (33), and a width of the
spacer (48) of the extension region (41) is approximately the same
as the thickness of the flat tube (33). The spacer (48) of the
extension region (41) is formed such that the flat surface thereof
is orthogonal to the airflow. That is, the width direction and the
height direction of the spacer (48) of the extension region (41)
are orthogonal to the airflow.
[0104] On the other hand, the spacer (48) of the insertion region
(40) is formed such that the flat surface thereof is tilted with
respect to the airflow. The spacer (48) is tilted from one side to
the other side of the spacer (48) with respect to the downwind
direction so that the air resistance may be reduced. That is, the
height direction of the spacer (48) of the insertion region (40) is
orthogonal to the airflow, and the width direction of the spacer
(48) of the insertion region (40) is tilted with respect to the
airflow.
[0105] The spacer (48) of the insertion region (40) is cut and bent
from the upwind side to the downwind side. The spacer (48) of the
extension region (41) is cut and bent from the downwind side to the
upwind side. This means that the spacer (48) of the insertion
region (40) and the spacer (48) of the extension region (41) are
formed such that the space between the spacers (48) is reduced.
[0106] The tips of the curved portions (48b) of the spacers (48) of
the extension region (41) and the insertion region (40) are in
contact with the main body (36c) of the adjacent fin body (36a),
and keep a predetermined space between adjacent fin bodies
(36a).
Advantages of First Embodiment
[0107] In the present embodiment, part of the fin body (36a) is
bent to form the spacer (48). Thus, the spacer (48) may have a
sufficient height, and a predetermine space can be kept between the
fins (36) with reliability.
[0108] The spacers (48) are formed in the insertion region (40) and
the extension region (41) of the fin body (36a). Thus, a
predetermine space can be kept between the fins (36) with
reliability throughout the fins (36).
[0109] The spacer (48) of the extension region (41) is located in
the dead water region behind the flat tube (33). Thus, the airflow
is not blocked.
[0110] The spacer body (48a) of the insertion region (40) is tilted
with respect to the airflow. Thus, the air resistance can be
reduced with reliability.
[0111] Part of the fin body (36a) is cut and bent to form the
spacer (48). Thus, no separate member is necessary to form the
spacer (48), and the structure can be simplified.
[0112] The spacer (48) of the insertion region (40) is cut and bent
from the upwind side to the downwind side, and the spacer (48) of
the extension region (41) is cut and bent from the downwind side
and the upwind side. Thus, the space between the spacer (48) of the
insertion region (40) and the spacer (48) of the extension region
(41) can be reduced, and the space between the fins (36) is
reliably kept.
[0113] The spacer (48) of the insertion region (40) is located in
the projection region (43) at a middle portion through which the
middle line between the flat tubes (33) passes. Thus, the space
between the fins (36) is reliably kept.
[0114] The tip of each spacer (48) is a long side. Thus, a
sufficient contact area with the adjacent fin (36) can be ensured,
and a predetermined space between the fins (36) can be reliably
kept.
[0115] The tip of the spacer (48) is off the hole (36d) that is
formed in the adjacent fin body (36a) as a result of cutting and
bending a corresponding spacer (48) in the adjacent fin body (36a).
Thus, the tip does not fit into the hole (36d) of the adjacent fin
body (36a). As a result, the spacer (48) can keep a predetermined
space between the fins (36) with reliability.
Second Embodiment of Invention
[0116] Now, the second embodiment of the present invention will be
described in detail, based on the drawings.
[0117] In the present embodiment, spacers (48) of the insertion
region (40) are provided at edges of the projection region (43), as
shown in FIG. 9 and FIG. 10, instead of providing the spacer (48)
of the insertion region (40) at the middle portion of the
projection region (43) as in the first embodiment.
[0118] Specifically, both sides of the projection region (43) of
the fin body (36a) include a gently-inclined edge (43a) which is
gently inclined toward the downwind side from the leading edge (38)
due to the cutout (45), a parallel edge (43b) continuous with the
gently-inclined edge (43a) and parallel with the airflow, and a
steeply-inclined edge (43c) which is continuous with the parallel
edge (43b) and is steeply inclined toward the downwind side. The
tube insertion portion (46) is continuous with the steeply-inclined
edge (43c).
[0119] The spacers (48) of the insertion region (40) are bent from
the parallel edges (43b) on both sides of the projection region
(43). Each of the spacers (48) of the insertion region (40) has a
trapezoidal shape, and includes a spacer body (48a) and a curved
portion (48b), similar to the spacer (48) of the first embodiment.
The spacer body (48a) is bent at a right angle from the projection
region (43), and parallel with the airflow.
[0120] The tips of the curved portions (48b) of the spacers (48) of
the insertion region (40) are in contact with edge portions of the
projection region (43) of the adjacent fin body (36a), and keep a
predetermined space between the adjacent fin bodies (36a).
[0121] In the second embodiment, a protrusion (60), i.e., a
heat-transfer promotion portion, is formed by bending the fin body
(36a) into an inverted V shape, instead of the upwind side louvers
(50) of the first embodiment. The other configurations and effects
are similar to those in the first embodiment. In particular, the
spacer (48) of the extension region (41) is similar to the spacer
(48) of the extension region (41) in the first embodiment.
Advantages of Second Embodiment
[0122] In the present embodiment, the spacers (48) are provided at
the parallel edges (43b) of the projection region (43) which are
parallel with the airflow. Thus, the airflow is not blocked, and
the air resistance can be significantly reduced. In particular, the
spacer (48) can be formed by using a portion to be removed in the
formation of the fin (36). It is thus possible to provide the
spacer (48) with efficiency.
[0123] The spacer body (48a) is parallel to the airflow. Thus, the
airflow is not blocked, and the air resistance can be further
reduced. The advantages of other configurations, e.g., the spacer
(48) of the extension region (41) are similar to those of the first
embodiment.
Third Embodiment of Invention
[0124] Now, the third embodiment of the present invention will be
described in detail, based on the drawings.
[0125] In the present embodiment, the spacer (48) of the extension
region (41) is straight behind the spacer (48) of the insertion
region (40), as shown in FIG. 11, instead of the spacer (48) of the
extension region (41) provided behind the flat tube (33) in the
first embodiment.
[0126] Specifically, the spacer (48) of the insertion region (40)
and the spacer (48) of the extension region (41) are provided at
the middle portion through which the middle line between the flat
tubes (33) passes. The spacer (48) of the extension region (41) is
straight behind the spacer (48) of the insertion region (40) on the
downwind side of the spacer (48) of the insertion region (40). The
middle portion includes a portion that is on the middle line
between the flat tubes (33), and also a portion that is off the
middle line to a certain extent.
[0127] Similar to the first embodiment, the spacer (48) of the
insertion region (40) is tilted with respect to the airflow, and
the spacer (48) of the extension region (41) is orthogonal to the
airflow, similar to the first embodiment.
[0128] In particular, the spacer (48) of the insertion region (40)
is cut and bent from the upwind side to the downwind side, and the
spacer (48) of the extension region (41) is cut and bent from the
downwind side to the upwind side. This means that the spacer (48)
of the insertion region (40) and the spacer (48) of the extension
region (41) are formed such that the space between the spacers (48)
is reduced.
[0129] On the other hand, the fin body (36a) of the present
embodiment is provided with a protrusion (60), i.e., a
heat-transfer promotion portion, which is formed by bending the fin
body (36a) into an inverted V shape as described in the second
embodiment, instead of the upwind side louvers (50) of the first
embodiment. Further, another protrusion (60), i.e., a heat-transfer
promotion portion, is provided in place of the louver (50) of the
downwind side louvers (50) in the first embodiment, which is
located on the downwind side of the intermediate region (42) of the
insertion region (40).
[0130] Further, another protrusion (60), i.e., the heat-transfer
promotion portion described in the second embodiment, is provided
in the extension region (41) of the fin body (36a). The protrusion
(60) of the extension region (41) is located behind the flat tube
(33), and the air flowing along the flat tube (33) in the space
between the flat tube (33), and the louvers (50) and the protrusion
(60), exchanges heat with the protrusion (60) of the extension
region (41).
[0131] The spacer (48) of the extension region (41) is located at a
position between the protrusions (60) of the extension region (41).
The other configurations and effects are similar to those in the
first embodiment. In particular, the spacer (48) of the extension
region (41) is similar to the spacer (48) of the extension region
(41) in the first embodiment.
Advantages of Third Embodiment
[0132] In the present embodiment, the spacer (48) of the extension
region (41) is straight behind the spacer (48) of the insertion
region (40) on the downwind side of the spacer (48) of the
insertion region (40). Thus, there is less effect on the spacer
(48) of the extension region (41) by the airflow, and it is
possible to reduce blocking of the airflow.
[0133] Similar to the first embodiment, the spacer (48) of the
insertion region (40) is cut and bent from the upwind side to the
downwind side, and the spacer (48) of the extension region (41) is
cut and bent from the downwind side to the upwind side. Thus, the
space between the spacer (48) of the insertion region (40) and the
spacer (48) of the extension region (41) can be reduced, and the
space between the fins (36) can be reliably kept.
[0134] The spacer (48) of the insertion region (40) is located in
the projection region (43) at a middle portion through which the
middle line between the flat tubes (33) passes. Thus, the space
between the fins (36) is reliably kept.
[0135] The spacer (48) of the extension region (41) is located
between the protrusions (60) of the extension region (41). Thus, it
is possible to promote heat exchange of the air flowing on the
lateral sides of the flat tube (33) and keep the space between the
fins (36) with reliability. The other advantages are the same as
those in the first embodiment.
Fourth Embodiment of Invention
[0136] Now, the fourth embodiment of the present invention will be
described in detail, based on the drawings.
[0137] In the present embodiment, a rib (48d) is provided at the
spacer (48) of the third embodiment as shown in FIG. 12 to FIG.
14.
[0138] The rib (48d) is a linear raised portion extending in a
projection direction of the spacer (48), and one rib (48d) is
provided at the spacer (48). The rib (48d) is located in a middle
portion of the spacer body (48a). The tip of the rib (48d) is
located at the tip of the spacer body (48a). The rib (48d) extends
from the spacer body (48a) via the bent portion (48c), and the base
end of rib (48d) is located at the main body (36c) of the fin body
(36a) In other words, the rib (48d) is bent at the bent portion
(48c), and the rib (48d) is not provided at the curved portion
(48b) of the spacer (48).
[0139] The rib (48d) is provided to increase the strength of the
spacer (48) in the projection direction, because the thickness of
the fin (36) is small and thus if the spacer (48) is formed by
simply cutting and bending the fin body (36a), the spacer (48) has
low proof strength and is easily deformed. As shown in FIG. 12, the
rib (48d) is formed in a state in which the spacer (48) is not cut
and bent from the fin body (36a) yet. In this state, the rib (48d)
projects in the same direction as the projection direction of the
protrusion (60). After that, the spacer (48) is cut and bent from
the fin body (36a) as shown in FIG. 13.
[0140] The rib (48d) is provided at each of the spacer (48) of the
insertion region (40) and the spacer (48) of the extension region
(41). The rib (48d) may include a plurality of ribs (48d). The
other configurations are similar to those in the third embodiment.
The spacers (48) of the first and second embodiments may be
provided with the rib (48d).
[0141] As described, since the rib (48d) is provided at the spacer
(48) in the present embodiment, the proof strength of the spacer
(48) can be increased. As a result, deformation of the spacer (48)
can be reliably prevented, and therefore, a predetermined space
between the fins (36) can be reliably kept.
[0142] The rib (48d) extends from the main body (36c) of the fin
body (36a) to the spacer (48). Thus, the strength of the bent
portion (48c) is increased, and inclination of the spacer (48) can
be reliably prevented. The other effects and advantages are similar
to those of the third embodiment.
Fifth Embodiment of Invention
[0143] Now, the fifth embodiment of the present invention will be
described in detail, based on the drawings.
[0144] In the present embodiment, as shown in FIG. 15, the spacer
(48) is in an L shape in place of the spacer (48) of the fourth
embodiment which is comprised of the spacer body (48a) and the
curved portion (48b).
[0145] Specifically, the spacer (48) includes a first portion (48e)
on the base end side, and a second portion (48f) on the tip side.
The first portion (48e) and the second portion (48f) are flat
plate-like portions. The first portion (48e) extends obliquely
upward toward the hole (36d), from the main body (36c) of the fin
body (36a) through the bent portion (48c). The second portion (48f)
is bent from the first portion (48e) at about a right angle, and
extends obliquely upward in a direction away from the hole (36d).
The spacer (48) is configured such that the tip of the second
portion (480 is in contact with the adjacent fin body (36a).
[0146] Further, a rib (48d) is provided at the spacer (48), similar
to the fourth embodiment. The rib (48d) extends from the main body
(36c) of the fin body (36a) to near the tip of the second portion
(480 via the first portion (48e). The other configurations, effects
and advantages are similar to those in the fourth embodiment. That
is, the spacer (48) of the present embodiment is applied to the
spacer (48) of the insertion region (40) and the spacer (48) of the
extension region (41), and may also be applied to the spacers (48)
in the first to third embodiments. In other words, the spacer (48)
of the present embodiment may not have the rib (48d).
Sixth Embodiment of Invention
[0147] Now, the sixth embodiment of the present invention will be
described in detail, based on the drawings.
[0148] In the present embodiment, as shown in FIG. 16, horizontal
ribs (61, 62), i.e., heat-transfer promotion portions, are provided
at the fin body (36a) of the third embodiment.
[0149] Specifically, the fin (36) is provided with two horizontal
ribs (61, 62) extending from the projection region (43) to the
intermediate region (42). Each of the horizontal ribs (61, 62) is a
raised line which projects in the same protruding direction as the
protrusion (60). The horizontal ribs (61, 62) are formed in an
upper portion and a lower portion of the projection region (43) of
the fin (36), and extends horizontally from the leading edge (38)
of the fin (36) to the second protrusion (60) from the upwind
side.
[0150] That is, the two horizontal ribs (61, 62) linearly extend in
the projection direction of the projection region (43) of the fin
(36) (i.e., the air passage direction). The horizontal ribs (61,
62) comprise reinforcement ribs which prevent the projection region
(43) of the fin (36) from being bent toward the adjacent fin (36).
The horizontal ribs (61, 62) further comprise heat-transfer
portions which promote heat transfer between the fin (36) and air
in an area located upwind of the intermediate region (42).
[0151] As described, the horizontal ribs (61, 62) which extend from
the projection region (43) to the intermediate region (42) of the
fin (36) are provided in the present embodiment. Thus, the air
before flowing in between the fins (36) can be cooled and
dehumidified. As a result, the accumulation of frost on the surface
of the intermediate region (42) of the fin (36) is reduced, and
therefore, it is possible to prevent a reduction in heat-transfer
rate of the fin (36) due to the accumulation of frost, and an
increase in flow pass resistance of the air passages (40).
Other Embodiments
[0152] The first and second embodiments of the present invention
may have the following configurations.
[0153] In the first aspect of the invention, the locations of the
spacers (48) are not limited to the insertion region (40) and the
extension region (41) of the fin body (36a), but the spacer (48)
may be formed only in the insertion region (40) of the fin body
(36a), or in the extension region (41) of the fin body (36a).
[0154] The number of spacers (48) of the insertion region (40) and
the extension region (41) is not limited as described in the first
and second embodiments, but the spacer (48) may be provided so as
to correspond to every other flat tube (33), for example.
[0155] The spacers (48) of the insertion region (40) of the second
embodiment may be provided at only one side of the projection
region (43).
[0156] The shape of the spacer (48) is not limited to a trapezoidal
shape in the first aspect of the invention, for example.
[0157] The spacer (48) of the insertion region (40) and the spacer
(48) of the projection region (43) in the third embodiment do not
necessarily have to be formed in the middle portion through which
the middle line between the flat tubes (33) passes, and may be
located closer to one of the flat tubes (33).
[0158] The protrusion (60) of the extension region (41) of the
third embodiment may be the louver (50) of the first
embodiment.
[0159] The rib (48d) of the fourth embodiment may be provided at
only the spacer (48), and may not be provided at the main body
(36c) of the fin body (36a).
[0160] The foregoing embodiments are merely preferred examples in
nature, and are not intended to limit the scope, applications, and
use of the invention.
INDUSTRIAL APPLICABILITY
[0161] As described above, the present invention is useful for heat
exchangers having a flat tube and a fin, and air conditioners
having the heat exchangers.
DESCRIPTION OF REFERENCE CHARACTERS
[0162] 30 heat exchanger [0163] 33 flat tube [0164] 36 fin [0165]
36a fin body [0166] 36b attachment portion [0167] 36c main body
[0168] 36d hole [0169] 40 insertion region [0170] 41 extension
region [0171] 42 intermediate region [0172] 43 projection region
[0173] 43b parallel edge [0174] 45 cutout [0175] 46 tube insertion
portion [0176] 48 spacer [0177] 48a spacer body [0178] 48b curved
portion [0179] 48c bent portion [0180] 48d rib
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