U.S. patent application number 10/992401 was filed with the patent office on 2005-06-16 for flow-path constituting body.
Invention is credited to Sugihara, Hiroshi, Takasawa, Kiyotsugu, Yokozawa, Mitsuo.
Application Number | 20050126750 10/992401 |
Document ID | / |
Family ID | 34649755 |
Filed Date | 2005-06-16 |
United States Patent
Application |
20050126750 |
Kind Code |
A1 |
Yokozawa, Mitsuo ; et
al. |
June 16, 2005 |
Flow-path constituting body
Abstract
A flow-path constituting body includes at least two port parts
where a fluid flows in or flows out, a flow path that is in
communication with the port parts, and a flexible film for forming
the flow path. The flow path is constructed by using a non-bonded
area defined by a bonded area of the flexible film. Alternatively,
a flow-path constituting body includes at least two port parts
where a fluid flows in or flows out and a flow path that is in
communication with the port parts. At least a part of the flow path
is constructed by a non-bonded area defined by a bonded area of a
flexible film or a flexible film and another member.
Inventors: |
Yokozawa, Mitsuo; (Nagano,
JP) ; Takasawa, Kiyotsugu; (Nagano, JP) ;
Sugihara, Hiroshi; (Nagano, JP) |
Correspondence
Address: |
REED SMITH, LLP
ATTN: PATENT RECORDS DEPARTMENT
599 LEXINGTON AVENUE, 29TH FLOOR
NEW YORK
NY
10022-7650
US
|
Family ID: |
34649755 |
Appl. No.: |
10/992401 |
Filed: |
November 18, 2004 |
Current U.S.
Class: |
165/46 ; 165/170;
257/E23.098 |
Current CPC
Class: |
G06F 2200/201 20130101;
H01L 2924/0002 20130101; F28F 3/14 20130101; F28F 21/065 20130101;
H01L 23/473 20130101; H01L 2924/0002 20130101; H01L 2924/00
20130101; F28F 2265/26 20130101; G06F 1/20 20130101 |
Class at
Publication: |
165/046 ;
165/170 |
International
Class: |
F28F 003/00 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 18, 2003 |
JP |
2003-387663 |
Claims
What is claimed is:
1. A flow-path constituting body comprising: at least two port
parts where a fluid flows in or flows out; a flow path which is in
communication with the port parts; and a flexible film for forming
the flow path wherein the flow path is constructed by using a
non-bonded area defined by a bonded area of the flexible film.
2. The flow-path constituting body according to claim 1, wherein
the flow path is constructed so as to be integrally provided with a
plurality of flow paths or a branched flow path by using the
flexible film.
3. The flow-path constituting body according to claim 1, wherein
the flexible film is a laminated film constructed of a metal layer
and a resin layer.
4. The flow-path constituting body according to claim 1, further
comprising a stagnation part comprised of a closed non-bonded area
provided on a side of the flow path and in communication with the
flow path.
5. The flow-path constituting body according to claim 4, further
comprising a deformation member accommodated in the closed
non-bonded area, whose volume is reduced by compressive
deformation.
6. The flow-path constituting body according to claim 4, wherein
the closed non-bonded area is disposed on an upper side of the flow
path.
7. The flow-path constituting body according to claim 1, further
comprising a cross-section holding means for maintaining a flowing
cross-section of the flow path.
8. The flow-path constituting body according to claim 7, wherein
the cross-section holding means is either of an inner support
member which is disposed within the non-bonded area of the flexible
film or an outside support member which holds one side of the
flexible film in the non-bonded area so as to separate from the
other side of the flexible film in the non-bonded area.
9. A flow-path constituting body comprising: at least two port
parts where a fluid flows in or flows out; and a flow path which is
in communication with the port parts; wherein at least a part of
the flow path is constructed by a non-bonded area defined by a
bonded area of a flexible film or a flexible film and another
member.
10. The flow-path constituting body according to claim 9, wherein
the flow path is constructed so as to be integrally provided with a
plurality of flow paths or a branched flow path by using the
flexible film.
11. The flow-path constituting body according to claim 9, wherein
the flexible film is a laminated film constructed of a metal layer
and a resin layer.
12. The flow-path constituting body according to claim 9, further
comprising a stagnation part which comprises of a closed non-bonded
area provided on a side of the flow path and is in communication
with the flow path.
13. The flow-path constituting body according to claim 12, further
comprising a deformation member accommodated in the closed
non-bonded area, whose volume is reduced by compressive
deformation.
14. The flow-path constituting body according to claim 12, wherein
the closed non-bonded area is disposed on an upper side of the flow
path.
15. The flow-path constituting body according to claim 9, further
comprising a cross-section holding means for maintaining a flowing
cross-section of the flow path.
16. The flow-path constituting body according to claim 9, wherein
the another member is a plate member or a block member made of
synthetic resin or metal and has a higher rigidity than the
flexible film.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority to Japanese Application No.
2003-387663 filed Nov. 18, 2003, which is incorporated herein by
reference.
FIELD OF THE INVENTION
[0002] The present invention relates to a flow-path constituting
body and specifically relates to a construction of a flow-path
constituting body that is suitable to cool the heating part of an
electronic apparatus such as a personal computer.
BACKGROUND OF THE INVENTION
[0003] In recent years, the performance of a personal computer has
been significantly improved and the processing speed of a CPU
(Central Processing Unit) has been also rapidly improved.
Therefore, the heat generating amount generated from a CPU chip and
the like increases and thus an improved cooling method is required.
A conventional cooling method is performed such that the heating
part such as the CPU chip is fixed on a heat sink provided with
fins and air-cooling is forcibly performed by sending airflow to
the heat sink with a fan or the like. However, in the air-cooling
system described above, noise of an air-cooling fan increases as
cooling performance is enhanced. Further, since a ventilation space
for cooling is not sufficiently ensured in a housing of a
miniaturized computer, a sufficient cooling efficiency can not be
obtained.
[0004] A liquid cooling system is known in which a cooling jacket
is contacted on a heating part such as a CPU chip, and a pump for
supplying liquid in the cooling jacket to circulate the liquid in a
liquid circulation path and a heat radiation part having a radiator
structure are provided (see Japanese Patent Laid-Open No.
2002-99356).
[0005] However, in the cooling system of the conventional liquid
cooling system, for example, the cooling jacket, the heat radiation
part, the pump, a reserve tank and the like are connected with a
tube made of metal or synthetic resin. Therefore, a lot of tubes
and connection couplings are required, which causes to increase the
number of component parts and to complicate connecting operations
at the time of assembling and thus time and labor are imposed for
manufacturing.
[0006] Further, since a tube made of synthetic resin having
flexibility is not generally provided with a gas barrier property,
a coolant cannot be completely prevented from volatilizing outside
at the tubes or connecting portions between the tubes and
respective components. Therefore, the amount of the coolant may
decrease according to the lapse of time. Accordingly, a secondary
chamber such as the reserve tank is required to be provided while
the volatilization amount of the coolant and the degree of
expansion/shrinkage of the coolant are taken into consideration and
moreover a sufficient capacity is required and thus it is difficult
to miniaturize the system. Alternatively, it is conceivable that a
metal pipe is used to prevent from volatilization of the coolant.
However, in this case, the pipe is difficult to be bent in an
appropriate shape and thus the laying work and the aligning work of
piping become difficult.
OBJECT AND SUMMARY OF THE INVENTION
[0007] In view of the problems described above, it is a primary
object and advantage of the present invention to provide a
flow-path constituting body, in which the laying work and the
aligning work are easy due to its flexibility when the flow path of
a fluid is constructed, and is capable of extremely easily
performing the constructing work for a flow path in manufacturing.
Also, it is a secondary object and advantage of the present
invention to provide a flow-path constituting body which is capable
of absorbing its volume variation due to the temperature variation
of a fluid (liquid) while providing a sufficient flexibility, and
is capable of ensuring the sealing property of the fluid.
[0008] In order to achieve the above object and advantage,
according to an embodiment of the present invention, there is
provided a flow-path constituting body including at least two port
parts where a fluid flows in or flows out, a flow path which is in
communication between the port parts, and a flexible film for
forming the flow path. The flow path is constructed by using a
non-bonded area defined by a bonded area of the flexible film.
[0009] In accordance with the embodiment of the present invention,
the flow path is constructed of substantially only the flexible
film. Therefore, its manufacturing is easy, the flexibility of the
flow-path constituting body can be enhanced, and the sealing
property of the flow path can be also enhanced.
[0010] Also, another flow-path constituting body in accordance with
an embodiment of the present invention includes at least two port
parts where a fluid flows in or flows out and a flow path which is
in communication between the port parts, and at least a part of the
flow path is constructed by a non-bonded area defined by a bonded
area of a flexible film or a flexible film and another member.
[0011] At least a part of the flow path is constructed of the
non-bonded area defined by the bonded area. In this case, the
flow-path constituting body may be constructed such that flexible
films not less than two sheets are adhesively bonded partly to one
another, one piece of flexible film is bent and folded to be
adhesively bonded partly, or a flexible film and another member are
adhesively bonded partly.
[0012] According to the embodiment having the construction
described above, the flow path is formed so as to be in
communication between the port parts and at least a part of the
flow path is constructed by a non-bonded area defined by a bonded
area of a flexible film or a flexible film and another member.
Therefore, the flow path in an appropriate configuration and
construction can be extremely easily constructed. Especially, when
the flow path is constructed by the non-bonded area defined by the
bonded area formed of two flexible film portions, a sufficient
flexibility can be ensured and thus the laying work and the
aligning work can be easily performed. Also, since the bonded area
is formed by using two flexible film portions or by using a
flexible film and another member, the rigidity of the bonded area
can be enhanced to some extent. Therefore, since an appropriate
maintenance of the flow path configuration is enabled by
constructing the configuration of the flow path so as to be adapted
in the system beforehand, the constructing work of the flow path
can be easily performed. In addition, the flow path configuration
can be extremely easily and freely formed by only appropriately
designing the bonded area and the non-bonded area formed of the
flexible film portions or the flexible film and the another
member.
[0013] In the flow-path constituting body in accordance with the
embodiment of the present invention, two pieces of flexible films
may be adhesively bonded and integrated partly with each other and
the flow path is constructed by the non-bonded area, both sides of
which are enclosed and defined by the bonded area. Alternatively,
after one piece of flexible film is folded and overlapped, two
overlapped flexible films are adhesively bonded partly to keep the
folded state. Then the flow path may be constructed by the
non-bonded area, both sides of which are enclosed and defined by
the bonded area, or by the non-bonded area, both sides of which are
enclosed and defined by the bent portion and the bonded area. The
another member described above which is adhesively bonded partly to
the flexible film may use an arbitrary member, for example, a plate
member or a block member made of synthetic resin, metal or the like
or may utilize respective construction components such as a heat
receiving part or a heat radiation part described later, a frame or
a housing.
[0014] In the present invention, the meaning of "adhesion" is not
limited to the case of being adhesively bonded with an adhesive but
broadly includes the case when flexible films are adhesively fixed.
Especially, it is preferable that two flexible films are directly
welded or fused each other, or that a flexible film and another
member are directly welded or fused each other.
[0015] In an embodiment of the present invention, it is preferable
that the flow path is constructed so as to be integrally provided
with a plurality of flow paths or a branching flow path by using
the flexible film. When a plurality of flow paths are integrally
constructed by using the flexible film, a plurality of pipes are
not required to be connected separately, or a plurality of pipes
are not required to be bundled. Therefore, a plurality of flow
paths can be collectively disposed without requiring a special
work. Further, when the flow path having a branch is integrally
constructed by using the flexible film, the complicated pipe
connecting work and coupling components are not required.
Therefore, the manufacturing cost and the size of piping system can
be reduced.
[0016] In an embodiment of the present invention, it is preferable
that the flexible film is a laminated film constructed of a metal
layer and a resin layer. When the flexible film is a laminated film
constructed of a metal layer and a resin layer, a sufficient
flexibility can be ensured while enhancing its fluid sealing
property and gas barrier property (steam barrier property). The
metal layer of the laminated film may be made of, for example,
aluminum, aluminum alloy, silver, silver alloy, copper, copper
alloy, gold, gold alloy or the like and may be formed with a foil
or an adhesion layer such as a vapor deposition layer or a coating
layer. The gas barrier property is easily ensured by providing the
metal layer. The resin layer of the laminated film may be
preferably made of plastic of polyolefin system such as
polyethylene or polypropylene. The laminated film is preferably
constructed such that the both faces of the metal layer are
respectively covered with the resin layer. Further, each blank
material is preferably used with which two resin layers or a resin
layer and a metal layer can be welded (fused) to each other. The
resin having such heat sealing property is, for example, the
above-mentioned polyolefin resin, some of polyesters or nylons.
[0017] In accordance with an embodiment of the present invention,
it is preferable that a stagnation part comprising of a closed
non-bonded area is provided on the side of the flow path and is in
communication with the flow path. According to the construction
described above, since the closed non-bonded area is provided on
the side of the flow path, a part of the fluid can be evacuated and
thus the volume variation due to the fluid expansion or shrinkage
can be absorbed and the bursting of or the fluid leakage from the
flow-path constituting body can be prevented. Further, when the
flow-path constituting body is installed in an attitude such that
the closed non-bonded area is disposed on the upper side of the
flow path and liquid is flowed in the flow path, gas contained in
the liquid or gas generated from the liquid can be stored in the
closed non-bonded area and kept in the state in which the gas is
separated from the liquid in the flow path. Therefore, the
occurrence of malfunctions due to the gas, for example, the
reduction of heat exchange efficiency or the situation that gas
enters into a pump to cause to be unable to eject the liquid can be
prevented.
[0018] In accordance with an embodiment of the present invention,
it is preferable that a deformation member is accommodated in the
closed non-bonded area, whose volume is reduced by compressive
deformation. According to the construction described above, since
the deformation member is accommodated in the closed non-bonded
area, the fluid flowing through the flow path hardly enters into
the closed non-bonded area normally so that the fluid does not
stagnate. On the other hand, when the volume of the fluid
increases, since the deformation member is compressed to reduce its
volume, the fluid can enter into the closed non-bonded area only by
the reduced amount of the volume. Accordingly, the volume variation
of the fluid can be absorbed without almost changing the appearance
of the flow-path constituting body.
[0019] In accordance with an embodiment of the present invention,
it is preferable that a cross-section holding means for maintaining
the flowing cross-section of the flow path is provided. Since the
flow path in the present invention is constructed with the
non-bonded area of the flexible film, it is conceivable that the
flowing cross-section of the flow path is not sufficiently ensured
when the fluid pressure is small. According to the embodiment of
the present invention, since the flowing cross-section can be
sufficiently ensured by providing the cross-section holding means
for maintaining the flowing cross-section of the flow path, the
flow path for the fluid can be sufficiently ensured and the flowing
resistance can be reduced. The cross-section holding means may be a
member which ensures a space between the flexible film portions in
the non-bonded area or a space between the flexible film and the
another member in the non-bonded area. For example, an inner
support member disposed within the flow path is used as the
cross-section holding means, which acts to separate the flexible
film portions from each other or to separate the flexible film from
the another member. Alternatively, an outside support member is
used as the cross-section holding means, which is fixed on the
outer face of one of the flexible film portions or of the flexible
film in the non-bonded area so as to act to separate from the other
flexible film portion or the another member. Especially, the inner
support member disposed within the flow path is preferable because
it can further surely maintain the cross section of the flow path.
Since the inner support member is disposed within the flow path, it
is preferably constructed so as not to obstruct the flow of the
fluid. For example, the inner support member is preferably a hollow
member. Also, the cross-section holding means is preferably
constructed so as not to obstruct the flexibility of the flow-path
constituting body in the flow path direction. Concretely, the
cross-section holding means also preferably has a flexibility
capable of bending in the flow direction. For example, when a
hollow member is used as the inner support member, the hollow
member may be constructed of flexible blank material or in a spiral
shape.
[0020] A heat exchanging system and a temperature control system
can be constructed by using the flow-path constituting body
described above. For example, the heat exchange (temperature
control) system includes a heat receiving part having a heat
absorption function, a heat radiation part having a heat radiation
function, a circulation path passing through the heat receiving
part and the heat radiation part, and a fluid propulsion means for
propelling fluid circulating in the circulation path. In the heat
exchange (temperature control) system, at least a part of the
circulation path is constructed by using either of the flow-path
constituting bodies described in the above-mentioned embodiments of
the present invention. The flow-path constituting body may connect,
for example, such that flow path is constructed between the heat
receiving part and the heat radiation part, between the heat
radiation part and the fluid propulsion means, or between the heat
receiving part and the fluid propulsion means. In this case, two
flow paths of a forward path and a return path provided between
respective construction components are preferably constructed in an
integral flow-path constituting body. Also, all of the connecting
flow paths between the respective construction components provided
in the system are further preferably constructed with a single
integral flow-path constituting body.
[0021] Other features and advantages of the invention will be
apparent from the following detailed description, taken in
conjunction with the accompanying drawings that illustrate, by way
of example, various features of embodiments of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0022] FIG. 1 is a schematic perspective view showing a heat
exchanging system in accordance with an embodiment of the present
invention;
[0023] FIG. 2 is a schematic exploded perspective view showing a
laminated structure of a flexible film in accordance with an
embodiment of the present invention;
[0024] FIG. 3 is a schematic perspective view showing a method for
manufacturing a flow-path constituting body in accordance with an
embodiment of the present invention;
[0025] FIG. 4 is a schematic perspective view showing a
construction example of a part of the flow-path constituting
body;
[0026] FIG. 5 is an enlarged partial cross-sectional view of the
construction example shown in FIG. 4;
[0027] FIG. 6 is a schematic perspective view showing another
construction example of a part of the flow-path constituting
body;
[0028] FIG. 7 is an enlarged partial cross-sectional view of the
construction example shown in FIG. 6;
[0029] FIG. 8 is a schematic exploded perspective view showing
another construction example of a part of the flow-path
constituting body;
[0030] FIG. 9 is a schematic perspective view showing another
construction example of a part of the flow-path constituting
body;
[0031] FIG. 10 is a schematic perspective view showing another
construction example of a part of the flow-path constituting body;
and
[0032] FIG. 11 is a plan view showing a flow-path constituting body
in accordance with another embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0033] Embodiments of the present invention will be described below
with reference to the accompanying drawings. Each of the
embodiments described below is a flow-path constituting body which
is used in a heat exchanging system including a heat receiving
part, a heat radiation part and a fluid propulsion means. However,
the flow-path constituting body in accordance with the present
invention is not limited to the application described above. The
flow-path constituting body can be widely applied to a constituting
body for constructing a flow path which is arranged as a part of
various systems.
[0034] FIG. 1 is a schematic construction perspective view showing
an overview of a heat exchanging system 100 into which a flow-path
constituting body in accordance with an embodiment of the present
invention is integrated. The heat exchanging system 100 includes a
heat receiving part (cooling jacket) 110, a heat radiation part
(radiator) 120, a cooling fan 130 for blowing airflow to a heat
radiation part 120 to forcedly cool, a fluid propulsion means
(pump) 140 for circulating fluid (liquid in the embodiment of the
present invention), and a flow-path constituting body 150
constructing a flow path between the heat receiving part 110 and
the heat radiation part 120.
[0035] The heat receiving part 110 is constructed such that a flow
path (not shown in the drawing) is formed inside to take heat from
a heating part (not shown in the drawing) such as a CPU chip by
abutting itself against the heating part. An inlet port and an
outlet port are provided on the heat receiving part 110 and port
parts 155 and 156 of the flow-path constituting body 150 are
connected to the inlet port and the outlet port.
[0036] The heat radiation part 120 includes an inlet port and an
outlet port connected to a flow path constructed in its inside not
shown in the drawing. Port parts 151 and 158 of the flow-path
constituting body 150 are connected to the inlet port and the
outlet port of the heat radiation part 120. A large number of
radiation fins 121 are provided on the outer face of the heat
radiation part 120 and heat is diffused outside through the
radiation fins 121. The heat radiation part 120 is constructed so
as to receive blown air from a cooling fan 130 having a well-known
construction. The airflow generated by the cooling fan 130 is blown
to the radiation fins 121 to forcibly cool the heat radiation part
120.
[0037] A fluid propulsion means 140 applies propulsion power to a
fluid with a drive source such as an electric motor. In the example
in FIG. 1, the fluid propulsion means 140 is connected to the end
portion of the heat radiation part 120 and operates so as to push
the fluid introduced from the inlet port of the heat radiation part
120 toward the outlet port of the heat radiation part 120. The
position of the fluid propulsion means 140 is not limited to the
example in the drawing and maybe disposed anywhere within a
circulation path described later.
[0038] In the embodiment of the present invention, a circulation
path is constructed so as to reciprocate between the heat receiving
part 110 and the heat radiation part 120. The circulation path is
constructed by using an integrally-formed flow-path constituting
body 150 in the example shown in the drawing. In other words, a
forward path and a return path are integrally constructed between
the heat receiving part 110 and the heat radiation part 120 by the
flow-path constituting body 150. The flow-path constituting body
150 includes the port parts 155 and 156 connected to the inlet port
and the outlet port of the heat receiving part 110, and the port
parts 151 and 158 connected to the inlet port and the outlet port
of the heat radiation part 120. The port parts 151 and 155 are in
communication with each other through a flow path 152, a stagnation
part (reserve tank) 153 and a flow path 154. The port parts 156 and
158 are in communication with each other through a flow path
157.
[0039] In the heat exchanging system 100 constructed as described
above, the propulsion power is applied to the fluid in the
circulation path by the fluid propulsion means 140, and thus the
fluid such as coolant is brought into the inlet port of the heat
radiation part 120 from the outlet port of heat receiving part 110
through the flow path 157 to radiate heat at the heat radiation
part 120. The fluid returns from the outlet port of the heat
radiation part 120 through the flow path 152, the stagnation part
153 and the flow path 154 to the heat receiving part 110 again,
where heat is taken from the outside.
[0040] The stagnation part 153 has a function providing an
evacuation space for absorbing the volume change of the fluid
accompanied with the rise and drop of the fluid temperature, a
reserve tank function for supplying the fluid when the fluid
decreases due to the volatilization and, when liquid is used as the
fluid, a gas storing function for storing gas contained in the
liquid or gas generated from the liquid.
[0041] The flow-path constituting body 150 is constructed such that
flexible films 150X and 150Y shown in FIG. 2 are adhesively bonded
each other to be formed as a sheet shaped member having flexibility
as a whole. The flexible film 150X or 150Y is, as shown in FIG. 2,
is a laminated body, in other words, a laminated film in which
resin layers 150A and 150C and a metal layer 150B are laminated
together. Thereby, both the gas barrier property (steam barrier
property) in the flow path and the deformation strength and the
corrosion resistance can be attained while providing
flexibility.
[0042] The resin layers 150A and 150C is formed of various types of
synthetic resin film. Especially, the synthetic resin film having a
heat sealing property such as polyethylene or polypropylene in a
polyolefin system is preferable. Also, raw material such as
polyester or nylon having a heat sealing property can be used. The
resin layers 150A and 150C may be made of the same raw material or
may be made of different raw material.
[0043] The metal layer 150B is preferably comprised of a foil or a
thin film (deposited film, spatter film, coating film and the like)
which formed of metal such as aluminum, aluminum alloy, copper,
copper alloy, silver, silver alloy, gold, and gold alloy.
[0044] The flexible films 150X and 150Y in accordance with the
embodiment of the present invention are respectively constructed
such that both the front/rear faces of the metal layer 150B are
covered with resin films 150A and 150C and thereby the deformation
strength or corrosion resistance of the metal layer 150B can be
suitably enhanced. Alternatively, when there is no problem for use,
the flexible film 150X or 150Y may be constructed such that only
one metal layer and one resin layer are laminated.
[0045] The flow-path constituting body 150 in the present
embodiment includes a bonded area in which the flexible films 150X
and 150Y are directly bonded or bonded with an adhesive and a
non-bonded area which is not bonded each other. Especially, the
flexible films 150X and 150Y are preferably constructed so as to be
respectively capable of performing heat seal and adhered (welded)
directly. In this case, for example, as shown in FIG. 3, heat seal
is performed between dies "A" and "B" for the flexible films 150X
and 150Y. A portion which is pinched and heated by the dies "A" and
"B" becomes to be a bonded area 150T. Since the die "A" is formed
with a groove "Aa" and the die "B" is formed with a groove "Ba", a
portion which is not pinched and heated becomes to be non-bonded
area 150S. As constructed above, an arbitrary flow path
construction 150z can be formed between the flexible films 150X and
150Y. For example, as shown in FIG. 3, a plurality of flow path
constructions 150z formed in the non-bonded area 150S can be
simultaneously constructed by the integrally-formed flexible films
150X and 150Y. Further, as shown by the dotted line in the drawing,
a branched flow path construction 150v (portion corresponding to a
groove "Ab" of the die "A" and a groove "Bb" of the die "B")
branching off from the halfway of the flow path construction 150z
can be constructed.
[0046] The flow path construction 150z in the drawing is formed in
the non-bonded area 150S whose both sides are defined by the bonded
areas 150T. Alternatively, the flow path construction may be formed
of a piece of flexible film which is bent and folded and thus the
non-bonded area may be constructed such that its one side is
defined by the bent portion and the other side is defined by the
bonded area as described above.
[0047] Further, a flow path can be similarly constructed easily
such that the flexible film described above and another member such
as a plate member and a block member are partly bonded to form the
bonded area and the non-bonded area. Also in this case, a plurality
of flow paths can be simultaneously constructed by the flexible
film described above and the above-mentioned another member
integrally or complicated flow path constructions including a
branch can be integrally constructed. However, when the
above-mentioned another member hardly have flexibility, the
flow-path constituting body also hardly have flexibility.
[0048] In FIG. 1, the port parts 151, 158, 155 and 156 provided in
the flow-path constituting body 150 are inflow ports or outflow
ports constructed at the end portion of the flow paths 152, 154 and
157. In the example shown in the drawing, the respective port parts
have a construction that a port member made of synthetic resin or
the like is held between the flexible films 150X and 150Y. The port
member is adhesively fixed or welded to the flexible films 150X and
150Y. The port member and the flexible films 150X, 150Y are
completely sealed up. The port member has a port hole in
communication with the flow path. The circulation path is
constructed by the port members being connected to the inlet port
or the outlet port of the heat receiving part 110 and the heat
radiation part 120.
[0049] The flow paths 152, 154 and 157 constructed in the flow-path
constituting body 150 are respectively constructed to form a nearly
constant cross section of the flow path in the extended direction.
Therefore, the stagnation of the fluid and the occurrence of
turbulence can be reduced. However, the flow path is not limited to
the construction having its constant cross section. An appropriate
flow path construction may be used in which, for example, a part of
the cross section of the flow path is enlarged.
[0050] The flow-path constituting body 150 has flexibility as a
whole. However, some rigidity can be obtained especially by the
bonded area 150T where the flexible films are bonded to each other.
Therefore, the configuration shown in the drawing can be maintained
by itself. In this case, when the area of the bonded area 150T is
increased, the rigidity of the flow-path constituting body 150
increases and, when the area of the bonded area 150T is decreased,
the rigidity of the flow-path constituting body 150 decreases.
Therefore, the rigidity and flexibility of the flow-path
constituting body 150 can be adjusted depending on the area of the
bonded area 150T. Concretely, in the embodiment of the present
invention, the rigidity and flexibility is adjusted by
appropriately forming the outside edge configuration or arranging
an opening 159 and notched part (slit) 159'. Especially, the
flexibility of the specified portion of the flow-path constituting
body 150 can be enhanced as necessary. For example, in the example
shown in the drawing, the flexibility of an area between the flow
paths 154 and 157 is enhanced by arranging the opening 159 and the
notched portion 159' between the flow paths 154 and 157, and thus
the relative positional relationship of the flow paths can be
easily changed. On the contrary, the rigidity of a specified
portion can be also enhanced. For example, in the example shown in
the drawing, a bonded area is formed between two portions of the
stagnation part 153 by forming the stagnation part 153 in a
U-shaped configuration. Thereby, the rigidity near the stagnation
part 153 is enhanced to be capable of maintaining its configuration
to some extent.
[0051] The opening 159 at an edge part near the flow path 152 and
the opening 159 at the upper portion of the stagnation part 153 are
formed as engaging holes for supporting the flow-path constituting
body 150 with a locking piece or the like not shown in the drawing.
The flow-path constituting body 150 may be fixed to another member
such as a frame, a support plate, or the heat receiving part 110,
the heat radiation part 120, the cooling fan 130, or the fluid
propulsion means 140 by various means such as adhesion, deposition,
or welding. In this case, it is desirable that the fixed portion of
the flow-path constituting body 150 is the bonded area 150T in
order to increase a supporting and fixing force.
[0052] The flow-path constituting body 150 is connected to other
construction parts in the system as shown in FIG. 1. Subsequently,
a specified amount of fluid is introduced from a fluid inlet port
153a and the heat exchanging system 100 is completed. At this time,
when the fluid is liquid, it flows into the stagnation part 153
from the fluid inlet port 153a and then flows into the respective
flow paths 152, 154 and 157. Finally, the fluid is filled in the
inside of the heat receiving part 110 and the heat radiation part
120. Since the fluid inlet port 153a is provided at the highest
position of the circulation path, the fluid can be filled the
entire circulation path by forming an air vent part at an
appropriate position. When the liquid is completely filled in the
circulation path, the fluid inlet port 153a is sealed by adhesion
(deposition) after completely removing air within the stagnation
part 153.
[0053] In this case, it is preferable that the liquid filled in the
flow-path constituting body 150 is kept within an amount to some
extent less than the maximum capacity of the flow-path constituting
body 150. For example, 90% or less of the maximum capacity is
preferably adopted. Thereby, bursting or liquid leakage from the
flow-path constituting body can be prevented even when the liquid
expands due to the temperature rise of the liquid. Especially, the
stagnation part 153 provides a function for preventing an internal
pressure from increasing by making the liquid be stored when the
liquid expands.
[0054] In addition, the stagnation part 153 functions as a reserve
tank for supplementing the liquid in the flow path when the liquid
reduces with lapse of time. The reduction of the liquid can be
suppressed to a negligible degree by using the flexible films 150X
and 150Y constructed of the laminated film as described in the
present embodiment having a high sealing property and a gas barrier
property (steam barrier property). However, the reduction of liquid
can not be avoided even if it is little at coupling portions
between the flow-path constituting body 150 and each of other
construction parts or in the inside of the respective other
construction parts. Therefore, the lifetime of product can be
extended by providing the stagnation part 153.
[0055] In addition, the stagnation part 153 provides a function for
gathering and storing gas such as air mixed in the liquid or
various gases discharged from the liquid. This function is
inevitably required when liquid is used as fluid. The gathering
function of the gas can be also realized by the following
evacuation part corresponding to the stagnation part 153 arranged
on the side of the flow path as well as the stagnation part 153 as
described above provided in the midway of the flow path.
[0056] FIGS. 4 and 5 are a schematic perspective view and an
enlarged cross sectional view showing a constructional example of
the evacuation part 150w which can be formed at a part of the flow
path construction 150z of the fluid construction body 150. The
evacuation part 150w is formed on the side of the flow path
construction 150z and constructed such that it is in communication
with the flow path construction 150z but other portion is closed as
a non-bonded area. An aperture part 150u of the evacuation part
150w to the flow path construction 150z is preferably constructed
such that its cross section of the opening is formed smaller than
both that of the flow path and that of the evacuation part 150w.
The evacuation part 150w is provided for preventing bursting of and
fluid leakage from the flow-path constituting body 150 by flowing a
part of the fluid into it through the aperture part 150u when the
pressure in the flow path construction 150z increases due to the
expansion of the fluid.
[0057] When the flow-path constituting body 150 is installed such
that the evacuation part 150w is disposed at an upper side of the
flow path construction 150z as shown in FIG. 5, the evacuation part
150w can be constructed so that, when liquid is used as fluid, gas
contained in the liquid or discharged from liquid is taken into the
evacuation part 150w and not returned to the flow path again.
Thereby, the situation is prevented that the pump can hardly
discharge the liquid due to the cause that gas enters and gathers
in the pump for flowing the liquid. In this embodiment, it is
constructed that gas is hard to return in the flow path by making
the aperture part 150u small. However, in order to further surely
prevent gas from returning to the flow path, a check valve may be
incorporated in the aperture part 150u of the stagnation part
150w.
[0058] FIGS. 6 and 7 are a schematic perspective view and an
enlarged cross-sectional view showing the construction example of a
flow path construction which is provided with an evacuation part
150p different from the above embodiment. The evacuation part 150p
is, as similar to the evacuation part 150w, formed on the side of
the flow path construction 150z and is constructed such that it is
in communication with the flow path construction 150z and other
non-bonded area is closed. In this embodiment, the aperture part of
the evacuation part 150p to the flow path is formed largely.
Concretely, when the evacuation part 150p is projected to the flow
path construction 150z, the entire projected plane becomes to be an
approximately aperture part. A deformation member 150q whose volume
reduces due to compressive deformation is accommodated in the
inside of the evacuation part 150p. The deformation member 150q can
be constructed, for example, by using a flexible bag body within
which gas is sealed, flexible porous material such as sponge or the
like. The deformation member may be constructed by using a magnet,
may be constructed as a heat sink or a heat-radiating body, or may
have an additional function as an adsorbent of impurities, a
deodorant material, a coloring material or the like.
[0059] In the construction described above, the volume of the
deformation member 150q is large as shown by the solid line in FIG.
7 when the volume or the pressure of the fluid are not so large and
thus the evacuation part 150p is approximately filled with the
deformation member 150q. Therefore, the fluid flowing through the
flow path construction 150z circulates within the flow path without
stagnation. When the fluid expands or the fluid pressure increases,
the deformation member 150q is compressed by the fluid pressure as
shown by the dotted line in the drawing and thus a part of the
fluid enters the inside of the evacuation part 150p. Thereby, since
the increase of the fluid pressure is moderated, the bursting of or
the fluid leakage from the flow-path constituting body are
reduced.
[0060] FIG. 8 is an exploded perspective view showing a
construction example in which an inner support member 150i as a
cross-section holding means is disposed in the inside of the flow
path construction 150z constructed in the flow-path constituting
body 150. The inner support member 150i is made of a flexible
member formed in a hollow shape which is constructed so as to
extend along the flow path direction in the inside of the flow path
construction 150z. In the embodiment shown in the drawing, the
inner support member 150i is constructed in a spiral shape so as to
be extended in the flow path direction. Concretely, the inner
support member 150i is constructed such that a band shaped member
is wound in a spiral shape so as to include a plate surface for
supporting the portions of the flexible films 150X and 150Y in the
non-bonded area.
[0061] The flowing cross-section of the flow path construction 150z
is supported from the inner side by disposing the inner support
member 150i in the inside of the flow path construction 150z. The
inner support member 150i is constructed in a hollow shape
(cylindrical shape) and thus the fluid flow in the flow path is not
obstructed. Also, since the inner support member 150i is provided
with the flexibility that is capable of being bent in the flow path
direction, the flexibility of the flow-path constituting body 150
is not impaired.
[0062] Alternatively, the inner support member may be constructed
so as to be erected in a column shape in the flow path construction
150z. The cross-section holding means is not limited to the
above-mentioned inner support member and may be constructed as an
outside support member, which is disposed on the outside of the
flow path construction 150z for holding and separating one of the
flexible films 150X and 150Y in the non-bonded area from the other
of the flexible films 150X and 150Y. The outside support member can
be comprised, for example, of a support piece in a circular shape
which is fixed on the outer face of the flexible film 150X to hold
the outer face of the flexible film 150X so as to separate away
from the opposed portion of the flexible film 150Y.
[0063] FIG. 9 is a schematic perspective view showing a
construction example that can be adopted as a construction for the
flow-path constituting body 150. The flow-path constituting body
150 shown in FIG. 1 constructs a flow path connecting between the
heat receiving part 110 and the heat radiation part 120. However,
in the construction shown in FIG. 9, an object "M" whose
temperature is to be controlled is directly disposed on the outer
face of a specified area 150N in the flow path construction 150z.
The object "M" is, for example, a heating part such as a CPU chip
that is to be thermally contacted to the heat receiving part 110
shown in FIG. 1. In this construction, a similar function to the
heat receiving part 110 shown in FIG. 1 can be realized by the
flow-path constituting body. Especially, since the object "M" whose
temperature is to be controlled is directly and thermally contacted
on the outer face of the specified area 150N in the flow path
construction 150z of the flow-path constituting body, a more
satisfactory heat exchange efficiency can be obtained.
[0064] The specified area 150N shown in the drawing is constructed
in a wide area to be capable of thermally contacting to the object
"M" whose temperature is to be controlled over a larger area in
accordance with the shape of the object "M". Thereby, the heat
exchange efficiency can be further enhanced. Also, the specified
area 150N and the object "M" may be held by an appropriate holding
means for maintaining the state that they are thermally contacted
each other. Alternatively, the specified area 150N and the object
"M" may be mutually fixed by means of adhesion with an adhesive or
deposition (welding).
[0065] FIG. 10 is a schematic perspective view showing another
construction example that can be adopted as a construction of the
flow-path constituting body 150. In this embodiment, an embedded
body 150L comprised of a magnet or a magnetic substance is disposed
between the flexible films 150X and 150Y and enclosed by the bonded
area. The embedded body 150L is disposed by the side of the flow
path construction 150z. In this embodiment, at least a part of an
object "K" whose temperature is to be controlled is comprised of
ferromagnetic substance or magnet and thereby the object "K" is
attracted and held by the embedded body 150L. Accordingly, by means
of that the object "K" whose temperature is to be controlled is
attracted and held by the embedded body 150L, the object "K" can be
simply held in a thermally contacting state on the flow path
construction 150z without providing other holding means. Also,
according to the construction described above, the object "K" can
be simply separated from the flow-path constituting body.
[0066] The flow-path constituting body in accordance with the
above-mentioned embodiment of the present invention can be
constructed so as to have various functions by interposing another
member between the flexible films 150X and 150Y. For example, the
rigidity of the sandwiching portion can be enhanced by means of
that a reinforcement sheet is sandwiched between the flexible films
and the configuration of the flow-path constituting body can be
controlled by setting the reinforcement sheet in an appropriate
shape. On the contrary, the flow-path constituting body can be
constructed so as to be easily capable of partially being bent or
folded by enhancing partial flexibility by arranging an aperture
part or a slit in a part of the flow-path constituting body.
[0067] FIG. 11 is a plan view showing a construction of a flow-path
constituting body 250 in accordance with another embodiment of the
present invention. In the flow-path constituting body 250, first
port parts 251a, 251b, 251c, second port parts 252a, 252b and third
port parts 253a, 253b are respectively formed in different
peripheral portions. In this embodiment, the first, the second and
the third port part are respectively provided with a plurality of
port parts. Flow paths 254a, 254b, 254c, 255a, 255b, 256a and 256b
are formed between the respective port parts, and a plurality of
port parts are respectively constructed so as to be in
communication with each other by the flow paths.
[0068] In the flow-path constituting body 250, any flow path of the
plurality of port parts is connected so as to be mutually in
communication with all other port parts. Therefore, a flow path
construction as required can be simply realized by appropriately
shutting off a portion between the flow paths with pressing or
adhesion (welding). For example, when the areas G1 through G5 shown
by the alternate long and short dash line in the drawing are
pressed or adhered (welded), the flow-path constituting body 250
can be constructed such that the first port part 251a is in
communication with the third port part 253a and the first port part
251b is in communication with the second port part 252a and the
third port part 253b (branching portion is provided). The pressing
of the areas G1 through G5 can be performed by using an appropriate
clamping tool. In this case, the flow-path constituting body 250
can be restored to its original state. Alternatively, the areas G1
through G5 may be thermally welded although they cannot be returned
to their original states.
[0069] The flow-path constituting body in accordance with the
present invention is not limited to the embodiments described above
and many modifications can be made without departing from the
present invention. For example, the heat exchanging system 100 in
accordance with the embodiment of the present invention is
constructed as a cooling system in which an object whose
temperature is to be controlled, not shown in the drawing, is
cooled by the heat receiving part 110. However, the heat exchanging
system 100 in accordance with the embodiment of the present
invention may be constructed as a heating system in which an object
whose temperature is to be controlled is heated by the heat
radiation part 120.
[0070] Also, in the heat exchanging system, plural heat receiving
parts (heat sink) are provided and these plural heat receiving
parts can be connected by using the above-mentioned flow-path
constituting body. In this case, a plurality of connecting portions
can be constructed by using an integrally formed flow-path
constituting body. Further, when an object to be cooled does not
include a partial hot part but its hot part ranges over a wide
area, for example, as the outer packaging portion of a hard disk,
the flow-path constituting body itself may be constructed as the
heat receiving part as shown in FIGS. 9 and 10. According to the
construction described above, the connecting portion to the heat
receiving part is not required. In this case, the metal layer
constructing the flexible film functions as a heat conductive
layer.
[0071] In the embodiments of the present invention as described
above, effects such as the reduction of the number of component
parts, the reduction of time schedule and the shortening of
delivery time can be attained in manufacturing processes by
constructing the flow-path constituting body as described above.
Also, the flow-path constituting body in accordance with the
embodiments of the present invention is superior in flexibility and
thus it can be easily provided in various spaces and disposed in a
flat passage because of its thin configuration. Accordingly, the
flow-path constituting body can be, for example, disposed through
the hinge part of a notebook-sized personal computer. In addition,
the flow-path constituting body in accordance with the embodiments
of the present invention has the following prominent effects. For
example, the flow path can be freely constructed such that the
cross sectional area of a flow path is appropriately chan in a flow
path direction and a plurality of flow paths are constructed in an
integral manner, and the flow path is constructed in an appropriate
branch structure such as a three-way or a crossroad shaped
intersection. Further, the flow-path constituting body can be
extremely flexibly dealt in various circumstances because, for
example, it can be stuck on various components, it can mount
various components thereon, and it can be installed along a
recess-projection face.
[0072] While the description above refers to particular embodiments
of the present invention, it will be understood that many
modifications may be made without departing from the spirit
thereof. The accompanying claims are intended to cover such
modifications as would fall within the true scope and spirit of the
present invention.
[0073] The presently disclosed embodiments are therefore to be
considered in all respects as illustrative and not restrictive, the
scope of the invention being indicated by the appended claims,
rather than the foregoing description, and all changes which come
within the meaning and range of equivalency of the claims are
therefore intended to be embraced therein.
* * * * *