HEAT EXCHANGING DEVICE, AND DEVICE ADAPTED FOR HOUSING HEAT
GENERATING ELEMENT AND USING THE HEAT EXCHANGING DEVICE
TECHNICAL FIELD
The present invention relates to heat-exchanging devices and heat generator casings
using the heat-exchanging device.
BACKGROUND ART
If a current of several tens of amperes travels through an electric device, such as a
receiver and transmitter used in a base station of mobile phones, the electric device generates
heat by electricity. Therefore, electric devices are sometimes called heat generators. To
reliably use this kind of electric device (hereafter referred to as "heat generator"), cooling of the
heat generator becomes extremely important. Conventionally, a base station (hereafter referred
to as "heat generator casing") for mobile phones that contain the heat generator is configured as
follows.
A conventional heat-exchanging device is described below with reference to drawings.
As shown in Fig. 22, a heat-exchanging device is housed in the heat generator casing.
More specifically, heat generator casing 100 includes heat-exchanging device 102 and heat
generator 103 inside housing 101. Internal air fan 105 and external air fan 106 are provided in
case 104 of heat-exchanging device 102.
Heat generated by heat generator 103 is transferred to heat-exchanging device 102 via
internal airflow 107, which is generated by internal air fan 105, in the housing. In other words,
internal air near heat generator 103 is drawn into internal air inlet 108 by operating internal air
fan 105. The heat of internal air drawn in is released to external air, which is described later,

while the internal air passes through heat exchanger 109. The internal air after releasing heat is
blown out to heat generator 103 through internal air outlet 110.
If external air fan 106 is operated, a flow of external air drawn 112 in from outside the
housing is established. In other words, the external air passing through external air inlet 111
absorbs heat from aforementioned internal air while the external air passes through heat
exchanger 109. External air absorbing heat is blown outside the housing through external air
outlet 113.
As illustrated in the drawing, internal air fan 105 and external air fan 106 are disposed
at positions facing each other relative to heat exchanger 109 installed on a wall of housing 101.
This structure slims heat generator casing 100, and reduces the space needed for installing heat
generator casing 100.
However, further downsizing of the area for installing heat generator casing 100 is
demanded.
Patent Literature 1: Japanese Patent Unexamined Publication No.2000-161875
Patent Literature 2: Japanese Patent Unexamined Publication No. 2001-99531
SUMMARY OF THE INVENTION
A heat-exchanging device of the present invention includes a first air blower and a
second air blower inside a first case.
The first case includes a first inlet, first outlet, second inlet, and second outlet. The
first inlet draws in a first fluid. The first outlet is provided in a direction different from that
facing the first inlet. The first outlet blows out the first fluid. The second inlet draws in a
second fluid. The second outlet is provided in a direction different from that facing the second
inlet. The second outlet blows out the second fluid. The first air blower makes the first fluid
flow from the first inlet to the first outlet via a first path. This forms a first passage. The

second air blower makes the second fluid flow from the second inlet to the second outlet via a
second path. This forms a second passage. The first passage where the first fluid flows and the
second passage where the second fluid flows exchange heat between the first fluid and the
second fluid inside the heat exchanger.
If this heat-exchanging device is used in a heat generator casing, two flows are formed:
The first fluid passing inside and outside of the heat generator casing, and the second fluid
circulating in the heat generator casing.
BRIEF DESCRIPTION OF DRAWINGS
Fig. 1 is a perspective view of a heat-exchanging device in accordance with a first
exemplary embodiment of the present invention.
Fig. 2 is an exploded view of a heat exchanger in accordance with the first exemplary
embodiment of the present invention.
Fig. 3 is a perspective view of the heat-exchanging device in accordance with the first
exemplary embodiment of the present invention.
Fig. 4 is a perspective view of the heat-exchanging device in accordance with the first
exemplary embodiment of the present invention.
Fig 5 is a perspective view of the heat-exchanging device in accordance with the first
exemplary embodiment of the present invention.
Fig. 6 is a perspective view of a heat generator casing in accordance with a second
exemplary embodiment of the present invention.
Fig. 7 is an internal layout of the heat generator casing in accordance with the second
exemplary embodiment of the present invention.
Fig. 8 is an internal layout of the heat generator casing in accordance with the second
exemplary embodiment of the present invention.

Fig. 9 is a perspective view of a heat generator casing in accordance with a third
exemplary embodiment of the present invention.
Fig. 10 is an internal layout of the heat generator casing in accordance with the third
exemplary embodiment of the present invention.
Fig. 11 is an internal layout of the heat generator casing in accordance with the third
exemplary embodiment of the present invention.
Fig, 12 is an internal layout of the heat generator casing in accordance with the third
exemplary embodiment of the present invention.
Fig. 13 is a perspective view of the heat generator casing in accordance with the third
exemplary embodiment of the present invention.
Fig. 14 is a vertical sectional view of a key part of a heat generator casing in
accordance with a fourth exemplary embodiment of the present invention.
Fig. 15 is a vertical sectional view of a key part of the heat generator casing in
accordance with the fourth exemplary embodiment of the present invention.
Fig. 16 is a magnified view of a key part of the heat generator casing in accordance
with the fourth exemplary embodiment of the present invention.
Fig. 17 is a magnified view of a key part of the heat generator casing in accordance
with the fourth exemplary embodiment of the present invention.
Fig. 18A is a magnified view of a key part of the heat generator casing in accordance
with the fourth exemplary embodiment of the present invention.
Fig. 18B is a magnified view of a key part of the heat generator casing in accordance
with the fourth exemplary embodiment of the present invention.
Fig. 19 is a vertical sectional view of a key part of the heat generator casing in
accordance with the fourth exemplary embodiment of the present invention.

Fig. 20 is a vertical sectional view of a key part of the heat generator casing in
accordance with the fourth exemplary embodiment of the present invention.
Fig. 21 is a vertical sectional view of a key part of the heat generator casing in
accordance with the fourth exemplary embodiment of the present invention.
Fig. 22 is a conceptual diagram of a conventional heat generator casing.
REFERENCE MARKS IN THE DRAWINGS
1,1a Heat-exchanging device
2,2a Case (first case)
2b Case (third case)
3,42 Heat exchanger
4, 38a Fan (first air blower)
5,44a Fan (second air blower)
6, 39a Inlet (first inlet)
7,40a Outlet (first outlet)
8,48,48a Inlet (second inlet)
9,46,46a Outlet (second outlet)
12,12aPath (first path)
12b Path (second path)
15,41a, 58a Passage (first passage)
16,45a, 59a Passage (second passage)
18 Inlet (third inlet)
19 Outlet (third outlet)
20 Cover (first cover)
21 Cover (second cover)

30, 50 Heat generator casing
31,51 Housing
32 Case (second case)
33 Heat-exchanging device
33a Heat-exchanging device (first heat-exchanging device)
33b Heat-exchanging device (second heat-exchanging device)
34,34a Side face (first wall)
34b Side face (third wall)
35 Rear face (second wall)
36, 36aOpening (first opening)
36b Opening (third opening)
37 Opening (second opening)
38b Fan (third air blower)
39b Inlet (third inlet)
49b Outlet (third outlet)
41b, 58b Passage (third passage)
42a Heat exchanger (first heat exchanger)
42b Heat exchanger (second heat exchanger)
44 Fan
44b Fan (fourth air blower)
45,45d, 45e, 59 Passage
45b, 59b Passage (fourth passage)
46b Outlet (fourth outlet)
47, 60, 60a, 60b, 60c Duct
48b Inlet (fourth inlet)

52, 52aInner side face (fourth wall)
52b Inner side face (sixth wall)
53 Inner rear face (fifth wall)
54, 54a Opening (fourth opening)
54b Opening (sixth opening)
55 Opening (fifth opening)
61 Inlet (duct inlet)
62, 62a, 62b, 62c Outlet (duct outlet)
64 Door
70 Outlet (seventh outlet)
71 Guide (first guide)
72 Guide (second guide)
73 Case bottom (bottom face of the first case)
74 Case top (top face of the second case)
75 Protrusion (second attachment portion)
76 Guide fitting portion (first guide fitting portion)
77 Fitting portion
78 Packing
79 Auxiliary portion
80,81 Slant
90 Attachment portion (first attachment portion)
91 Attachment portion (third attachment portion)
92 Attachment portion (second attachment portion)
103 Heat generator

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Exemplary embodiments of the present invention are described below with reference to
drawings. However, the exemplary embodiments herein are illustrative, and thus the present
invention is not limited to these exemplary embodiments.
(FIRST EXEMPLARY EMBODIMENT)A heat-exchanging device in the first exemplary
embodiment of the present invention is described below with reference to Figs. 1 to 5. Heat-
exchanging device 1 includes heat exchanger 3, fan 4 that is the first air blower, and fan 5 that is
the second air blower in case 2 that is the first case.
Case 2 includes inlet 6 that is the first inlet for drawing in external air as the first fluid,
and outlet 7 that is the first outlet for blowing out external air that has passed through heat
exchanger 3. Case 2 also includes inlet 8 that is the second inlet drawing in internal air as the
second fluid, and outlet 9 that is the second outlet for blowing out internal air that has passed
through heat exchanger 3. In the first exemplary embodiment, inlet 6 and outlet 7 for external
air are provided on horizontally-adjacent side faces of case 2. Inlet 8 and outlet 9 for internal
air are provided on a bottom face of case 2.
Heat exchanger 3 is described with reference to Fig. 2. Multiple ribs 11 are provided
on the surface of heat exchanger plate 10. Path 12 is formed between these ribs 11. Blocking
plate 13 is provided on the surface ends of heat exchanger plate 10 in the same direction as that
of ribs 11. Multiple heat exchanger plates 10 as configured above are stacked in a 90-degree
shifted manner alternately. As a result, the external air flows along path 12a that is the first path
formed on heat exchanger plate 10a. The internal air flows along path 12b that is the second
path formed on heat exchanger plate 10b. Blocking plates 13a provided on the ends of heat
exchanger plate 10a prevent the internal air from flowing into path 12a on heat exchanger plate
10a. In the same way, blocking plates 13b provided on the ends of heat exchanger plate 10b

prevent the external air from flowing into path 12b on heat exchanger plate 10b. With this
structure, paths 12a and 12b are configured in directions crossing each other. External air and
internal air flow along these paths 12a and 12b, respectively. As a result, the external air and
the internal air exchange heat via heat exchanger plate 10a.
Heat exchanger plate 10 is made of a thermoplastic resin film, such as polystyrene,
polypropylene, and polyethylene. Other than these materials, heat exchanger plate 10 may be
typically made of a metal plate, such as aluminum, paper with heat conductivity and moisture
permeability, a microporous resin film, or paper in which resin is mixed.
Heat exchanger plate 10 is typically formed by vacuum forming, pressured forming,
extreme-pressure forming, or press forming.
A centrifugal air blower is used for fan 4 and fan 5. In the first exemplary
embodiment, fan 4 is provided between heat exchanger 3 and outlet 7. Fan 5 is provided
between heat exchanger 3 and outlet 9. With this structure, fan 4 makes the external air passing
through paths 12a in heat exchanger 3 flow in a direction perpendicular to path 12a.
Accordingly, the external air drawn in from inlet 6 for external air passes along paths 12a, and
flows to outlet 7. This flow of external air is passagel5 that is the first passage.
In the same way, fan 5 makes the internal air passing through paths 12b in heat
exchanger 3 flow in a direction perpendicular to paths 12b. Accordingly, the internal air drawn
in from inlet 8 for internal air passes through path 12b, and flows to outlet 9. This flow of
internal air is passage 16 that is the second passage.
More specifically, in heat exchanging device 1 in the first exemplary embodiment, fan
4 is provided between heat exchanger 3 and outlet 7, and fan 5 is provided between heat
exchanger 3 and outlet 9. This structure makes directions of paths 12a and 12b in heat
exchanger 3 the same directions as those of rotating axes of fans 4 and 5 respectively. By
reducing the number of bends in heat exchanging device 1, a pressure loss due to bends in

passages 15 and 16 can be suppressed. As a result, an installation area of heat exchanging
device 1 can be reduced. In addition, since fans 4 and 5 act to draw out the external air and
internal air passing through paths 12a and 12b, reduction in a flow rate of external air and
internal air in passages 15 and 16 is suppressed. Furthermore, inlets 6 and 8 and outlets 7 and 9
are provided at predetermined positions. Accordingly, passage 15 is formed horizontally, and
passage 16 is formed vertically. As a result, heat exchanging device 1 builds a three-
dimensional passage in horizontal and vertical directions.
Next, as shown in Figs. 3 to 5, inlet 18 for internal air that is the third inlet, and outlet
19 that is the third outlet are provided on heat exchanging device 1a. Inlet 18 is disposed at a
position facing inlet 8. Outlet 19 is disposed at a position facing outlet 9. Covers 20 and 21
that are the first cover and the second cover are provided on inlets 8 and 18 and outlets 9 and 19
respectively. As shown in Fig. 4, covers 20 and 21 are provided on unused inlet 18 and unused
outlet 19 respectively so as to form predetermined passage 16. Alternatively, as shown in Fig.
5, to form predetermined passage 16, covers 20 and 21 are provided on unused inlet 8 and
unused outlet 9 respectively. This structure establishes passage 16 of upward- or downward-
stream relative to heat exchanging device 1a. In other words, directions of passages 15 and 16
can be changed with a single configuration of heat-exchanging device 1a.
Covers 20 and 21 are made of airtight elastic body formed of closed cell foam, such as
ethylene propylene diene rubber foam (hereafter referred to as EPDM rubber foam), or the same
material as steel plate configuring case 2. Air-tightness of inlets 8 and 18 or outlets 9 and 19
improve if they are covered with elastic body such as EPDM rubber foam.
With the above structure, heat-exchanging device 1a offers two installation directions
by the single configuration. Heat-exchanging device 1a is disposed at symmetric positions in a
heat generator casing. More specifically, heat-exchanging device 1a enables installation of
symmetrical heat-exchanging devices at an upper part of the housing. The second fluid in the

housing flows to the second passage, and exchanges the heat with the first fluid passing through
the first passage. In this way, inside the housing is cooled down. As a result, an installation
area of the heat generator casing can be reduced.
(SECOND EXEMPLARY EMBODIMENT)
A heat generator casing using heat-exchanging device 1, which is described in the first
exemplary embodiment, is described with reference to Figs. 6 to 8.
Fig. 6 is a perspective view of the heat generator casing seen from the rear oblique
direction. Fig. 7 is an internal layout of the heat generator casing seen from the top. Fig. 8 is an
internal layout of the heat generator casing seen from the side.
Heat generator casing 30 includes case 32 that is the second case inside housing 31.
Heat-exchanging device 33a that is the first heat-exchanging device, and heat-exchanging
device 33b that is the second heat-exchanging device are disposed on case 32. Heat-exchanging
device 33a uses first case 2a. Heat-exchanging device 33b uses third case 2b.
Housing 31 includes side face 34a that is the first wall, side face 34b that is the third
wall, and rear face 35 that is the second wall. Opening 36a that is the first opening and opening
36b that is the third opening for drawing in external air are provided on side faces 34a and 34b.
Opening 37 that is the second opening for blowing out the external air passing through heat-
exchanging devices 33a and 33b, which is described later, is provided on rear face 35.
Heat generator 103, such as a receiver or transmitter of mobile phone, is housed in case
32.
As shown in Figs. 6 and 7, fan 38a that is the first air blower and fan 38b that is the
third air blower for blowing out external air are provided in heat-exchanging devices 33a and
33b on case 32 such that fan 38a and fan 38b face each other. Inlet 39a that is the first inlet of
heat-exchanging device 33a and inlet 39b that is the third inlet of heat-exchanging device 33b

are provided in a direction facing openings 36a and 36b, respectively. Outlet 40a that is the first
outlet of heat-exchanging device 33a and outlet 40b that is the third outlet of heat-exchanging
device 33b are provided in a direction facing opening 37. By disposing heat-exchanging
devices 33a and 33b this way, passage 41a indicated by an arrow in the drawing is established
as the first passage. As the third passage, passage 41b indicated by an arrow in the drawing is
established. In other words, external air drawn in from openings 36 and 36b created in both
side faces 34a and 34b of housing 31 flows to heat exchanger 42a that is the first heat exchanger
and heat exchanger 42b that is the second heat exchanger. This external air passes through
paths provided inside heat exchangers 42a and 42b in a rotating axis direction of fans 38a and
38b. Meanwhile, the external air exchanges heat with internal air, which is described later. The
external air reaching fans 38a and 38b changes its direction for almost 90 degrees by fans 38a
and 38b, and is blown out of housing 31 from opening 37 via outlets 40a and 40b. In this way,
passages 41a and 41b are established as horizontal air passages.
On the other hand, as shown in Fig. 8, fan 44 (hereafter equivalent to fan 44a that is the
second air blower and fan 44b that is the fourth air blower) is provided in housing 31 at the side
of front face 43 in heat-exchanging device 33 (hereafter equivalent to heat-exchanging devices
33a and 33b). This fan 44 establishes passage 45 that is the second or fourth passage (hereafter
equivalent to passage 45a that is the second passage and passage 45b that is the fourth passage)
vertically circulating in housing 31.
The internal air exchanges heat with external air while the internal air passes through
paths provided in heat exchanger 42 (hereafter equivalent to heat exchangers 42a and 42b). Fan
44 changes the flow direction of the internal air passing through heat exchanger 42 to a
vertically downward direction. The internal air blown out from outlet 46 that is the second
outlet (hereafter equivalent to second outlet 46a and fourth outlet 46b) via duct 47 to a lower
part of housing 31 is led into case 32 that is the second case where heat generator 103 is housed.

When the internal air passes inside case 32, the internal air takes away heat generated by heat
generator 103. The internal air absorbing the heat is drawn into heat-exchanging device 33
from case 32 via inlet 48 that is the second inlet (hereafter equivalent to second inlet 48a and
fourth inlet 48b).
As described above, heat generator casing 30 in the second exemplary embodiment has
a structure described below. Heat-exchanging devices 33a and 33b establish passages 41a, 41b,
45a, and 45b in two directions, i.e. horizontal and vertical directions. These heat-exchanging
devices 33a and 33b are disposed on case 32 housing the heat generator.
In heat generator casing 30 as configured above, heat generated by heat generator 103,
such as a transmitter or receiver, increases the temperature of air inside case 32. This wanned
air is drawn into heat-exchanging device 33 through inlet 48 by fan 44. On the other hand, fans
38a and 38b draw in external air, which is cold air outside housing 31, to heat-exchanging
devices 33a and 33b through openings 36a and 36b and inlets 39a and 39b. Heat exchangers
42a and 42b installed in heat-exchanging devices 33a and 33b are configured by stacking up
heat exchanger plates on which paths for passing air are provided. These heat exchangers 42a
and 42b lead in air with temperature difference from two directions, so as to exchange heat
between these streams of air. After exchanging the heat by drawing in the internal air and
external air to these heat exchangers 42a and 42b, cooled internal air is blown out from outlet
46 into case 32 via duct 47. On the other hand, the external air warmed by heat exchange is
blown out from outlets 40a and 40b to outside heat generator casing 30 via opening 37.
As described above, heat-exchanging device 33 in the first exemplary embodiment can
reduce the installation area. Since the installation area is small, this heat-exchanging device 33
enables placement of two fans 39a and 38b facing each other on case 32. If centrifugal air
blowers are used for fans 38a and 38b, external air is drawn in at a high flow rate from the
entire paths of heat exchangers 42a and 42b configuring passages 41a and 41b to fans 38a and

38b. If the external air is drawn in at a high flow rate by fans 38a and 38b, the heat exchange
efficiency of heat-exchanging devices 33a and 33b improves. In the same way, if two fans 44a
and 44b are used, the internal air vertically circulating in housing 31 also flows fast. The fast
flow of the internal air enables removal of more heat generated from the heat generator.
Cooling performance of the heat generator thus improves.
As a result, heat generator casing 30 in the second exemplary embodiment can reduce
its installation area.
Fig. 8 is an internal layout seen from side face 34a that is the first wall. Components
related to first heat-exchanging device 33a illustrated in the drawing correspond to components
of second heat-exchanging device 33b seen from side face 34b that is the third wall.
(THIRD EXEMPLARY EMBODIMENT)
A heat generator casing in the third exemplary embodiment of the present invention is
described with reference to Figs. 9 to 13. Components that have the same functions as those
already described are given the same reference marks. Aforementioned description applies to
components given the same reference marks.
Fig. 9 is a perspective view of the heat generator casing seen from the rear oblique
direction. Fig. 10 is an internal layout of the heat generator casing seen from the top. Figs. 11
and 12 are internal layouts of the heat generator casing seen from the side. Fig. 13 is a
perspective view of the heat generator casing seen from the front oblique direction.
In heat generator casing 50, inner side face 52a that is the fourth side wall, inner side
face 52b that is the six side wall, and inner rear face 53 that is the fifth wall are provided inside
housing 51 configured with side face 34a that is the first wall, side face 34b that is the third
wall, and rear face 35 that is the second wall. As shown in the drawings, opening 36a that is the
first opening and opening 36b that is the third opening for drawing in external air are created

near the center of side faces 34a and 34b. On inner side face 52a, opening 54a that is the fourth
opening is provided at a position facing inlet 39a that is the first inlet of heat-exchanging device
33a. On inner side face 52b, opening 54b that is the sixth opening is created at a position facing
inlet 39a that is the third inlet of heat-exchanging device 33b. Opening 36 and opening 54a, and
opening 36b and opening 54b are created such that their open areas do not overlap.
Similarly, opening 37 that is the second opening for blowing out external air is
provided near the center of rear face 35. On inner rear face 53, opening 55 that is the fifth
opening is created at a position facing outlet 40a that is the first outlet of heat-exchanging
device 33a and outlet 40b that is the third outlet of heat-exchanging device 33b. Opening 37
and opening 55 are created such that their open areas do not overlap.
As shown in Figs. 9 and 10, side face 34a and inner side face 52a form path 56a, and
side face 34b and inner side face 52b form path 56b. Rear face 35 and inner rear face 53 form
path 57.
In the above structure, passage 58a that is the first passage and passage 58b that is the
third passage are established through the following routes by driving fans 38a and 38b.
External air drawn in from openings 36a and 36b passes through paths 56a and 56b, and is led
to openings 54a and 54b. The external air further passes through openings 54a and 54b and
inlets 39a and 39b, and is drawn into heat-exchanging devices 33a and 33b. After the external
air exchanges its heat with internal air in heat exchangers 42a and 42b in heat-exchanging
devices 33a and 33b, fans 38a and 38b change a flow direction, and the external air is led to
outlets 40a and 40b. The external air further passes through opening 55 and path 57, and is
blown out through opening 37 to outside housing 51.
This heat generator casing 50 achieves the following effect. Passages 58a and 58b are
bent only once in heat-exchanging devices 33a and 33b in the third exemplary embodiment. By
reducing the number of bends in heat-exchanging devices 33a and 33b, pressure losses caused

by bending of passages 58a and 58b can be suppressed. Since pressure losses are suppressed in
heat-exchanging devices 33a and 33b, a predetermined cooling performance of heat generator
casing 50 can be secured, even if a pressure loss occurs by providing openings 36a and 54a and
openings 36b and 54b at different heights.
Accordingly, openings 54a, 54b, and 55 facing heat-exchanging devices 33a and 33b
can be created at positions higher than those of openings 36a, 36b, and 37 that are directly open
to outside housing 51. Therefore, even if heat generator casing 50 is installed outside, rainwater
blowing in from openings 36a, 36b, and 37 is not drawn into heat-exchanging devices 33a and
33b. The cooling performance of heat generator housing 50 will thus last long.
Next is described passage 59 that is the fourth passage (hereafter equivalent to passage
59a that is the second passage and passage 59b that is the fourth passage) vertically formed
inside housing 51 of heat generator casing 50.
As shown in Fig. 11, duct 60 is disposed between front face 43 of housing 51 and case
32. Inlet 61 that is a duct inlet is provided at a position facing outlet 46 that is the second outlet
of heat-exchanging device 33. Outlets 62a, 62b, and 62c that are duct outlets are provided at a
lower part in housing 51. Outlet 62c of duct 60 is provided near bottom face 63 of housing 51
so that passage 59 includes an internal air flow near bottom face 63 of the housing. As a result,
heat inside housing 51 is efficiently released.
In addition, as shown in Fig. 12, multiple outlets 62a, 62b, and 62c of multiple ducts
60a, 60b, and 60c are provided at positions with different vertical heights. This structure
enables to blow out the internal air in case 32 from different heights. As a result, the internal air
spreads in housing 51, and heat generated in case 32 is led to inlet 48 along passage 59 without
being retained. Fan 44 draws in the internal air, which is led to inlet 48, to heat exchanger 42.
The heat generated in case 32 and carried to heat exchanger 42 through passage 59 is exchanged

with passages 58a and 58b for external air by passing through heat exchanger 42. The heat
transferred to passages 58a and 58b is released outside housing 51, as described above.
As shown in Figs. 11 and 12, duct 60 is configured in line with its purpose .
As shown in Fig. 13, duct 60 is installed on door 64 of housing 51. This structure
enables quick checking at checking inside heat generator casing 50 because duct 60 moves
together with door 64.
As a result, the side wall can be thinned, compared with a conventional heat generator
casing in which the heat-exchanging device is installed on the side wall, such as a door. A heat
generator casing with small installation area and a predetermined cooling performance can be
achieved.
The second fluid in housing 51 circulates between inlet 48 and outlet 46 without
causing short-circuit by installing heat-exchanging devices 33a and 33b at an upper part in
housing 51. As a result, an installation area of heat generator casing 50 can be reduced. Still
more, heat generator casing 50 achieves a predetermined cooling performance.
Furthermore, housing 51 has door 64 where duct 60 is provided. As a result, duct 60 is
removed by opening door 64 at checking inside heat generator casing 50. Accordingly, inside
the casing can be checked efficiently.
(FOURTH EXEMPLARY EMBODIMENT)
A heat generator casing in the fourth exemplary embodiment of the present invention is
described with reference to Figs. 14 to 21. Components with functions similar to those already
described are given the same reference marks. Aforementioned description is applied to
components given the same reference marks.
Figs. 14,15, and 19 to 21 are vertical sectional views of a key part of the heat generator
casing. Figs. 16 to 18A and 18B are magnified views of a key part of the heat generator casing.

As shown in Figs. 14 and 15, case 32 that is the second case where a heat generator is
housed is provided inside heat generator casing 50. Heat-exchanging device 33 including case
2 that is the first case is disposed on this case 32.
As described in the first to third exemplary embodiments, outlet 46 that is the second
outlet is provided to the side of front face 43 of housing 51, and inlet 48 that is the second inlet
is provided to the side of rear face 35 of housing 51 in heat-exchanging device 33. Internal air
blown out from outlet 46 is drawn into case 32 from a wall to the side of outlet 46 of case 2 via
duct 60. The internal air drawn into case 32 rises along a wall to the side of inlet 48 of case 2,
and is drawn into inlet 48 of heat-exchanging device 33 from outlet 70 that is the seventh outlet
provided on case top 74, which is the top face of the second case. Accordingly, passages 45d
and 45e that vertically circulate in housing 51 are formed by driving fan 44.
Guide 71 that is the first guide is provided on case bottom 73, which is the bottom face
of the first case. Guide 71 slides on guide 72, which is described later, when case 2 is installed
on case 32.
Outlet 70 is provided on case top 74 to circulate internal air from case 32 to inlet 48 of
heat-exchanging device 33. As described in the first to third exemplary embodiments, passages
45d and 45e, which are circulating internal air streams, flow downward at the side of front face
43 of housing 51, and flows upward at the side of rear face 35 of housing 51. Accordingly,
outlet 70 of case 32 is provided on case top 74 at the side of rear face 35 of housing 51. Guide
72 that is the second guide on which aforementioned guide 71 moves is provided on case top
74. Guide 71 and guide 72 are provided in a direction of helping the movement of case 2. In
the fourth exemplary embodiment, this direction is a direction from front face 43 to rear face 35
of housing 51.

As shown in Fig. 15, protrusion 75 that is the second attachment portion is provided at
a tip of guide 72. Protrusion 75 protrudes toward the direction of placing case 2 on case 32.
With this structure, guide 71 can be easily positioned on guide 72 at placing case 2 on case 32.
Guide fitting portion 76 that is the first guide fitting portion is provided on case top 74
between guide 72 and outlet 70. As indicated in the drawing, length L1 of this guide fitting
portion 76 is longer than length L2 of guide 71. This structure makes guide 71 and guide fitting
portion 76 act as a positioner for attaching case 2 at a predetermined position on case 32.
Procedures for attaching case 2 on cast top 74 are further detailed next. As shown in
Fig. 15, case 2 moves on case top 74 from the side of front face 43 to the side of rear face 35 of
housing 51. As shown in Figs. 16 to 18A and 18B, when inlet 48 provided on case bottom 73
reaches the position facing outlet 70 provided on case 32, guide 71 is fitted into guide fitting
portion 76. Fitting portion 77 protruding toward a heat-exchanging device is provided around
outlet 70. Packing 78 is provided around this fitting portion 77. Auxiliary portion 79
protruding inward case 2 is provided at inlet 48 of case 2. Diameter 02 of inlet 48 of case 2 is
larger than diameter Φ1 of fitting portion 77 provided at outlet 70 of case 32. Therefore, this
fitting portion 77 is inserted into auxiliary portion 79. When fitting portion 77 is inserted into
auxiliary portion 79, packing 8 fills around this insert portion. This increases air-tightness of
the insert portion. If these fitting portion 77 and auxiliary portion 79 are provided, the next
effect can be expected at installing heat generator casing 50 outside. Even if rainwater blows
into housing 51, entry of rainwater into case 2 or case 32 can be suppressed.
As described above, heat-exchanging device 50 is attached by placing guide 71
provided on case bottom 73 on guide 72 provided on case top 74, and moving heat-exchanging
device 50 on guide 72. With this structure, heavy heat-exchanging device 50 can be easily
attached to case 32. Since the attachment position of case 2 is determined by fitting guide 71
into guide fitting portion 76, case 2 can be fixed without fine adjustment. In addition, since

inlet 48 provided on case 2 and outlet 70 provided on case 32 are also fitted at the same time, a
man-hour spent for attachment work can be reduced.
As shown in Figs. 16 to 18A and 18B, at least one of guide 71 and guide 72 is slanted.
If a corner of guide 71 is slanted, slant 80 is created at a corner where guide 71 faces guide 72
and case top 74 when case 2 is placed on case 32. If a corner of guide 72 is slanted, slant 81 is
created at a corner where guide 72 faces guide 71 and case bottom 73 when case 2 is placed on
case 32. If slant 80 or 81 is created at a corner of at least guide 71 or 72, case 2 can be
gradually lowered as guide 71 moves on guide 72, and is fitted into guide fitting portion 76.
Accordingly, case 2 can be smoothly placed on case top 74.
Catch 82 is provided on guide 71 and guide 72 to engage each other. This structure
enables accurate placement of case 2 on case top 74.
The heat generator casing is further described with reference to Figs. 19 to 21.
Attachment portion 90 that is the first attachment portion is provided at a predetermined
position around case 2. Attachment portion 91 that is the third attachment portion is provided
on the inner top face of housing 51. Attachment portion 92 that is the second attachment
portion is provided at a predetermined position of case 32. Case 2 is attached to a
predetermined position on case 32 by using these attachment portions 90, 91, and 92.
Attachment portion 91 and attachment portion 92 have the following structure so as to place
tilted case 2 on case top 74.
As shown in Figs. 20 and 21, attachment portion 91 and attachment portion 92 are
vertically angled with predetermined angle a relative to housing 51. Alternatively, attachment
positions of attachment portion 91 and attachment portion 92 are horizontally shifted for
dimension L3.
As shown in Fig. 19, thickness t1 of guide 71 may be thinner than thickness t2 of guide
72.

With the above structures, case 2 is placed on case top 74 in a state that the side of inlet
48 is tilted downward. As a result, attachment pressure of outlet 70 and inlet 48 increases by its
own weight of case 2. Air-tightness also improves.
This attachment method facilitates attachment on case 32 even if heat-exchanging
device 33 is heavy.
As described above, the heat-exchanging device in the exemplary embodiment of the
present invention is used in a heat generator casing. Two flows, i.e., the first fluid passing
inside and outside the heat generator casing and the second flow circulating inside the heat
generator casing, are formed. The first fluid drawn in from the first inlet passes through the
heat exchanger, and then the first air blower blows out this first fluid from the first outlet that is
horizontally disposed.
The second fluid drawn in from the second inlet passes through the heat exchanger, and
then the second air blower blows out this second fluid from the second outlet that is vertically
disposed.
If the first air blower and the second air blower form approximately orthogonal flows
of a horizontal flow of the first fluid and a vertical flow of the second fluid, the same effects as
those described in the exemplary embodiments of the present invention can be achieved.
The second fluid carries heat generated inside the heat generator casing to the heat
exchanger. The heat of the second fluid is released to the first fluid in the heat exchanger, and
then the second fluid circulates inside the heat generator casing. The first fluid absorbing the
heat in the heat exchanger is blown out of the heat generator casing. Accordingly, the heat
generated in the heat generator casing is released outside the heat generator casing.
The first fluid drawn in by the first air blower via the heat exchanger is blown out from
the first outlet. The second fluid that exchanges the heat with the first fluid via this heat
exchanger is drawn into the heat exchanger by the second air blower. The second air blower

then blows out the second fluid that has exchanged the heat in the heat exchanger from the
second outlet. With this structure, fluids blown out from the first outlet and the second outlet
are blown out far away. As a result, occurrence of short-circuiting is prevented, improving
cooling performance. In particular, since the second fluid vertically circulates, the heat-
exchanging device is not necessarily installed on a door, as in the prior art. The heat-
exchanging device can be placed on an upper part in the heat generator casing. Accordingly, an
installation area of the heat generator casing can be reduced. In addition, predetermined cooling
performance can be achieved.
INDUSTRIAL APPLICABILITY
The heat-exchanging device and the heat generator casing of the present invention is
effectively applicable to base stations of communications equipment installed in places with
restricted installation area, such as a rooftop of city building, and cooling devices in other pieces
of equipment installed outside.

We Claim:
1. A heat-exchanging device comprising:
a first case including a first inlet for drawing in a first fluid, a first outlet for
blowing out the first fluid in a direction different from a direction of drawing in the first fluid
through the first inlet, a second inlet for drawing in a second fluid, and a second outlet for
blowing out the second fluid in a direction different from a direction of drawing in the second
fluid through the second inlet;
a first air blower housed in the first case, the first air blower forming a first
passage where the first fluid flows from the first inlet to the first outlet via a first path;
a second air blower housed in the first case, the second air blower forming a
second passage where the second fluid flows from the second inlet to the second outlet via a
second path; and
a heat exchanger housed in the first case, the heat exchanger including the first
path and the second path, and exchanging heat between the first fluid and the second fluid.
2. The heat-exchanging device of claim 1, wherein
the first case further comprising:
a third inlet at a position facing the second inlet; and
a third outlet at a position facing the second outlet;
wherein
the second air blower is a centrifugal air blower that changes a flow of the
second fluid coming via the second path to a direction perpendicular to the flow.
3. The heat-exchanging device of claim 2, wherein the first case further
comprising:

a first cover for covering one of the second inlet and the third inlet; and
a second cover for covering one of the second outlet and the third outlet;
wherein
the first cover and the second cover form the second passage.
4. A heat generator casing comprising:
a housing including a first wall having a first opening for drawing in a first
fluid, and a second wall having a second opening for blowing out the first fluid;
a first heat-exchanging device housed in the housing, the first heat-exchanging
device comprising:
a first case including a first inlet for drawing in the first fluid that is
drawn in from the first opening;
a first outlet for blowing out the first fluid to the second opening, the
first outlet being provided in a direction different from a direction that the first
inlet draws in the first fluid;
a second inlet for drawing in a second fluid; and
a second outlet for blowing out the second fluid in a direction different
from a direction that the second inlet draws in the second fluid;
a first air blower housed in the first case, the first air blower forming a
first passage where the first fluid flows from the first inlet to the first outlet via
a first path;
a second air blower housed in the first case, the second air blower
forming a second passage where the second fluid flows from the second inlet
to the second outlet via a second path; and

a first heat exchanger housed in the first case, the first heat exchanger
including the first air path and the second path, and exchanging heat between
the first fluid and the second fluid;
a second case; and
a heat generator housed in the second case.
5. The heat generator casing of claim 4, wherein
the housing further comprising a third wall having a third opening for drawing
in the first fluid; and
the heat generator casing further comprising a second heat-exchanging device
housed in the housing, the second heat-exchanging device comprising:
a third case including a third inlet for drawing in the first fluid that is
drawn in from the third opening;
a third outlet for blowing out the first fluid to the second opening,
the third outlet being provided in a direction different from a direction that the
third inlet draws in the first fluid;
a fourth inlet for drawing in the second fluid; and
a fourth outlet for blowing out the second fluid in a direction
different from a direction that the fourth inlet draws in the second fluid;
a third air blower housed in the third case, the third air blower forming a
third passage where the first fluid flows from the third inlet to the third outlet
via a third path;
a fourth air blower housed in the third case, the fourth air blower
forming a fourth passage where the second fluid flows from the fourth inlet to
the fourth outlet via a fourth path; and

a second heat exchanger housed in the third case, the second heat
exchanger including the third path and the fourth path, and exchanging heat
between the first fluid and the second fluid.
6. The heat generator casing of claim 5, wherein the first air blower, the second
air blower, the third air blower, and the fourth air blower are centrifugal air blowers.
7. The heat generator casing of claim 5, wherein
the first case further comprising:
a fifth inlet at a position facing the second inlet;
a fifth outlet at a position facing the second outlet;
a first cover covering one of the second inlet and the fifth inlet; and
a second cover covering one of the second outlet and the fifth outlet;
wherein
the second air blower is a centrifugal air blower that changes a flow of the
second fluid coming via the second path to a direction perpendicular to the flow; and
the first cover and the second cover form the second passage.
8. The heat generator casing of claim 5, wherein
the third case further comprising:
a sixth inlet at a position facing the fourth inlet;
a sixth outlet at a position facing the fourth outlet;
a third cover covering one of the fourth inlet and the sixth inlet; and
a fourth cover covering one of the fourth outlet and the sixth outlet;
wherein

the fourth air blower is a centrifugal air blower that changes a flow of the
second fluid coming via the fourth path to a direction perpendicular to the flow; and
the third cover and the fourth cover form the fourth passage.
9. The heat generator casing of claim 4, wherein
the housing further comprising:
a fourth wall having a fourth opening on an inner side of the first wall, the
fourth opening being created at a position different from a position facing the first opening and
at a position facing the first inlet; and
a fifth wall having a fifth opening on an inner side of the second wall, the fifth
opening being created at a position different from a position facing the second opening and at a
position facing the first outlet.
10. The heat generator casing of claim 5, wherein
the housing further comprising:
a fourth wall having a fourth opening on an inner side of the first wall, the
fourth opening being created at a position different from a position facing the first opening and
at a position facing the first inlet;
a fifth wall having a fifth opening on an inner side of the second wall, the fifth
opening being created at a position different from a position facing the second opening and at a
position facing the first outlet; and
a sixth wall having a sixth opening on an inner side of the third wall, the sixth
opening being created at a position different from a position facing the third opening and at a
position facing the third outlet.

11. The heat generator casing of one of claims 4 and 5, further comprising a
duct including a duct inlet and a duct outlet, the duct being provided in the housing;
wherein
the duct inlet is disposed at a position facing the second outlet, and
the duct outlet is disposed at a position lower than the duct inlet.
12. The heat generator casing of claim 11, wherein the duct comprises a
plurality of duct outlets including the duct outlet, the plurality of duct outlets being disposed at
different heights.
13. The heat generator casing of claim 11, wherein the housing further
comprising a door for opening and closing the housing, the duct being disposed on the door.
14. The heat generator casing of claim 4, wherein
the first case further comprising a first guide on a bottom face of the first case,
the first guide protruding downward; and
the second case comprising:
a second guide on a top face of the second case, the second guide protruding
upward;
a seventh outlet for blowing out the second fluid; and
a first guide fitting portion provided between the second guide and the seventh
outlet, the first guide being fitted into the first guide fitting portion.
15. The heat generator casing of claim 14, wherein the first guide has a corner
facing the second guide and the top face of the second case, the corner being slanted.

16. The heat generator casing of claim 14, wherein the second guide has a
corner facing the first guide and the bottom face of the first case, the corner being slanted.
17. The heat generator casing of claim 14, wherein
the second case further comprising:
a fitting portion around the seventh outlet, the fitting portion protruding toward
the first case; and
a packing provided around the fitting portion.
18. The heat generator casing of claim 17, wherein the first case further
comprising an auxiliary portion at the second inlet, the auxiliary portion protruding toward
inside the first case.
19. The heat generator casing of claim 14,
wherein
the first guide of the first case moves on the second guide of the second case in
a predetermined direction;
the first case further includes a first attachment portion protruding along a
direction perpendicular to the predetermined direction;
the second case further includes a second attachment portion on an outer surface
of the second case, the second attachment portion fixing the first attachment portion; and
the housing further includes a third attachment portion on an inner surface of
the housing, the third attachment portion fixing the first attachment portion.

20. The heat generator casing of claim 19, wherein the guide is fitted into the
first guide fitting portion by moving the first guide on the second guide.
21. The heat generator casing of claim 19, wherein the bottom face of the first
case is tilted downward from the second outlet to the second inlet.
22. The heat generator casing of claim 19, wherein the second attachment
portion protrudes from an end of the outer surface of the second case in a direction opposite to
the seventh outlet.

A heat-exchanging device employed in a heat generator casing with a small installation area.
The heat-exchanging device includes a heat exchanger, a first air blower, and a second air
blower in a first case. The first case includes a first inlet, a first outlet, a second inlet, and a
second outlet. The first outlet is disposed in a direction different from a direction facing the
first inlet. The second outlet is disposed in a direction different from a direction facing the
second inlet. A first path where a first fluid flows and a second path where a second fluid flows
cross in the heat exchanger. Heat is exchanged between the first fluid and the second fluid.
The first air blower establishes a first passage where the first fluid flows from the first inlet to
the first outlet via the first path. The second air blower establishes a second passage where the
second fluid flows from the second inlet to the second outlet via the second path.