US20020166655A1 - Cooling device boiling and condensing refrigerant - Google Patents
Cooling device boiling and condensing refrigerant Download PDFInfo
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- US20020166655A1 US20020166655A1 US10/136,086 US13608602A US2002166655A1 US 20020166655 A1 US20020166655 A1 US 20020166655A1 US 13608602 A US13608602 A US 13608602A US 2002166655 A1 US2002166655 A1 US 2002166655A1
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- Prior art keywords
- refrigerant
- header tank
- tube
- tubes
- refrigerant container
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/0233—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes the conduits having a particular shape, e.g. non-circular cross-section, annular
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/0266—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with separate evaporating and condensing chambers connected by at least one conduit; Loop-type heat pipes; with multiple or common evaporating or condensing chambers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
Definitions
- the present invention relates to a cooling device for cooling a heat-generating member by movement of latent heat based on boiling and condensation of refrigerant.
- a heat-generating member 130 is attached to a heat reception plate of the refrigerant container 110 .
- the heat radiation core 120 is constructed by a pair of header tanks 121 , plural tubes (heat radiation tubes) 122 and heat radiation fins 123 .
- the header tanks 121 are attached to a heat radiation plate 111 of the refrigerant container 110 to be substantially perpendicular to the heat radiation plate 111 .
- Each of the tubes 122 is disposed between the header tanks 121 to communicate with the header tanks 121 .
- Refrigerant stored in the refrigerant container 110 is boiled and evaporated by receiving heat from the heat-generating member 130 , and the evaporated refrigerant (gas refrigerant) flows into the tubes 122 from the refrigerant container 110 through the header tanks 121 .
- the gas refrigerant radiates heat to outside air and is condensed to be liquid refrigerant while flowing through the tubes 122 , and the condensed refrigerant (liquid refrigerant) is returned into the refrigerant container 110 .
- the heat-generating member 130 is cooled.
- the cooling device 100 when the tube 122 is inserted deeply into the header tank 121 , an opening of the tube 122 may be closed by an inner surface of the header tank 121 .
- the thickness of the header tank 121 is set larger in order to prevent the opening of the tube 122 from being closed, the capacity of the tubes 122 is reduced, and heat radiation performance of the heat radiation core 120 is also reduced, thereby reducing cooling performance of the cooling device 100 .
- the cooling device 100 is used in a bottom posture where the heat-generating member 130 is positioned under the refrigerant container 110 , refrigerant circulation fails and heat radiation performance is reduced.
- a cooling device for cooling a heat-generating member by boiling and condensing refrigerant
- refrigerant is boiled by receiving heat from a heat-generating member attached to a refrigerant container, and flows into a header tank through plural tubes to radiate heat to outside in a heat radiation core.
- the refrigerant container is constructed by stacking a plurality of plates to define a space where refrigerant is stored
- the header tank is also constructed by stacking a plurality of plates. Therefore, the plates having the same shape can be used in common for both the refrigerant container and the header tank, and the cooling device can be manufactured in low cost.
- the capacity of the header tank or the refrigerant container can be readily changed in accordance with a thermal load in the heat-generating member, only by increasing or decreasing the number of the plates. Accordingly, cooling performance in the cooling device can be improved while being manufactured in low cost.
- the plurality of tubes includes first tubes through which refrigerant flows from the refrigerant container to the header tank and second tubes through which refrigerant flows from the header tank to the refrigerant container.
- a first barrier portion, for restricting refrigerant from flowing into the second tube is provided in the refrigerant container
- a second barrier portion for restricting refrigerant from flowing into the first tube
- gas refrigerant, boiled by receiving heat from the heat-generating member in the refrigerant container flows into the first tubes, and liquid refrigerant in the header tank can be returned into the refrigerant container through the second tubes. Therefore, it can restrict an interference between the gas refrigerant from the refrigerant container to the header tank, and the liquid refrigerant from the header tank to the refrigerant container, thereby improving refrigerant circulation and cooling performance.
- the plurality of tubes includes first tubes each having an insertion length inserted into the header tank, and second tubes each having an insertion length inserted into the header tank, smaller than that of each first tube.
- Each first tube protrudes from an inner surface of the header tank inside the header tank by a predetermined length. Accordingly, an amount of liquid refrigerant introduced into the first tubes from the header tank is reduced. On the contrary, an amount of liquid refrigerant introduced into the second tubes from the header tank is increased. As a result, the amount of gas refrigerant flowing into the first tubes from the refrigerant container is increased, thereby improving the refrigerant circulation.
- the header tank includes a first plate defining a plurality of first holes into which the tubes are inserted, and a second plate on which the first plate is stacked.
- the second plate defines a plurality of second holes each having an open area smaller than an open area of each first hole, and the tube is inserted into the first hole to contact the second plate around the second hole to communicate with the second hole. Accordingly, each tube can be readily positioned at a predetermined position in a stack direction of the plates without using an additional part such as spacers. Therefore, it can prevent an opening portion in each tube from contacting an inner surface of the header tank, while the thickness of the header tank can be reduced.
- FIG. 1 is a schematic side view showing a cooling device according to a first embodiment of the present invention
- FIG. 2 is a schematic sectional view showing the cooling device taken along line II-II in FIG. 1;
- FIG. 3A is a plan view showing a heat radiation plate constructing a refrigerant container of the cooling device
- FIG. 3B is a plan view showing an intermediate plate constructing the refrigerant container
- FIG. 3C is a plan view showing an intermediate plate constructing the refrigerant container.
- FIG. 3D is a plan view showing a heat reception plate constructing the refrigerant container, according to the first embodiment
- FIG. 4 is a sectional view showing a stopper structure of the refrigerant container according to the first embodiment
- FIG. 5 is a schematic side view showing a cooling device according to a second embodiment of the present invention.
- FIG. 6 is a schematic sectional view of the cooling device taken along line VI-VI in FIG. 5;
- FIG. 7A is a plan view showing a heat radiation plate constructing a refrigerant container of the cooling device according to the second embodiment
- FIG. 7B is a plan view showing an intermediate plate constructing the refrigerant container
- FIG. 7C is a plan view showing an intermediate plate constructing the refrigerant container.
- FIG. 7D is a plan view showing a heat reception plate constructing the refrigerant container
- FIG. 8 is a schematic side view showing a cooling device according to a third embodiment of the present invention.
- FIG. 9 is a schematic side view showing a cooling device according to a fourth embodiment of the present invention.
- FIG. 10 is a schematic sectional view showing the cooling device, used in a bottom posture, taken along line X-X in FIG. 9;
- FIG. 11 is a schematic sectional view showing the cooling device, used in a side posture, in FIG. 9;
- FIG. 12 is a plan view showing a heat radiation plate according to a fifth embodiment of the present invention.
- FIG. 13 is a plan view showing an another heat radiation plate according to the fifth embodiment.
- FIG. 14 is a plan view showing an another heat radiation plate according to the fifth embodiment.
- FIG. 15 is a plan view showing an another heat radiation plate according to the fifth embodiment.
- FIG. 16 is a schematic side view showing a cooling device according to a sixth embodiment of the present invention.
- FIG. 17 is a schematic sectional view showing the cooling device according to the sixth embodiment.
- FIG. 18 is a schematic sectional view showing the cooling device taken along line XVIII-XVIII in FIG. 16;
- FIG. 19 is a schematic sectional view showing a stopper structure in a refrigerant container of a cooling device according to a seventh embodiment of the present invention.
- FIG. 20 is a schematic sectional view showing a part of a cooling device around an attachment portion between tubes and a header tank according to an eighth embodiment of the present invention.
- FIG. 21 is a schematic sectional view showing a part of the cooling device around an attachment portion of tubes and a refrigerant container according to the eighth embodiment
- FIG. 23 is a schematic sectional view showing a cooling device according to a ninth embodiment of the present invention.
- FIG. 24 is a schematic sectional view showing a cooling device according to a tenth embodiment of the present invention.
- FIG. 25 is a schematic sectional view showing a part of a cooling device around an attachment portion of tubes and a refrigerant container, according to an eleventh embodiment of the present invention.
- FIG. 26 is a schematic sectional view showing a cooling device according to a twelfth embodiment of the present invention.
- FIG. 27A is a schematic sectional view showing an insertion structure of a tube into a header tank of a cooling device according to a thirteenth embodiment of the present invention.
- FIG. 27B is a schematic sectional view showing another insertion structure of the tube into the header tank according to the thirteenth embodiment
- FIG. 28 is a schematic sectional view showing a part of a reference cooling device around an attachment portion of tubes and a header tank, for explaining the thirteenth embodiment
- FIG. 29 is a schematic sectional view showing a part of an another reference cooling device for explaining the thirteenth embodiment
- FIG. 30 is a schematic sectional view showing a cooling device, used in a side posture, according to a fourteenth embodiment of the present invention.
- FIG. 32 is a schematic sectional view showing a cooling device having two header tanks divided from each other, according the fourteenth embodiment
- FIG. 33A is a schematic diagram showing an insertion state of a tube into a refrigerant container and a header tank in a fifteenth embodiment of the present invention.
- FIG. 34 is a plan view showing an end surface of a tube according to the fifteenth embodiment.
- FIG. 36 is a sectional view showing a part of the refrigerant container taken along line XXXVI-XXXVI in FIG. 35;
- FIG. 37 is a schematic diagram showing a tube insertion state when being viewed from arrow A in FIG. 33A;
- FIG. 38 is a schematic sectional view showing a cooling device according to a modification of the present invention.
- FIG. 39 is a perspective view showing a conventional cooling device.
- a cooling device 1 is constructed by a refrigerant container 2 and a heat radiation core 3 .
- a heat-generating member 4 is fixed to a bottom surface of the refrigerant container 2 substantially at a center by using screws 5 .
- the heat-generating member 4 is a computer chip mounted on a printed circuit board.
- the refrigerant container 2 has a stack structure constructed by stacking plural plates 6 , for example, four plates 6 .
- FIGS. 3 A- 3 D four attachment holes 6 a , into which the screws are screwed for fixing the heat-generating member 4 to the heat reception plate 6 A, are provided in each of the plates 6 as through holes in a stack direction of the plates 6 .
- Plural openings 6 b into which tubes 8 of the heat radiation core 3 are inserted, are provided in the heat radiation plate 6 B, as shown in FIG. 3A.
- plural slits 6 c are provided in two patterns A, B in the intermediate plates 6 C substantially over all the surface, respectively. In the pattern A shown in FIG. 3B, the slits 6 c are provided to extend in a longitudinal direction of the intermediate plate 6 C.
- the slits 6 c are provided to extend in a direction perpendicular to the longitudinal direction of the intermediate plate 6 C.
- the slits 6 c of the pattern A and the slits 6 c of the pattern B are provided to communicate with each other, and to define the refrigerant chamber 7 .
- metal portions are provided between the slits 6 c , to form a thermal conductor in the stack direction of the intermediate plates 6 C when the intermediate plates 6 C are stacked.
- the heat reception plate 6 A and the heat radiation plate 6 B are thermally connected to each other by the thermal conductor of the intermediate plates 6 C.
- tube stoppers 6 d metal portions
- FIG. 4 when the intermediate plate 6 C is stacked with the heat radiation plate 6 B, a part of the metal portion (where the slit 6 c is not provided) of the intermediate plate 6 C covering the opening 6 b is used as the stopper 6 d , in the opening 6 b of the heat radiation plate 6 B.
- the tube 8 inserted into the opening 6 b of the heat radiation plate 6 B, contacts the stopper 6 d and is positioned at a predetermined position in the stack direction of the plates 6 .
- the heat radiation core 3 is constructed by plural tubes (e.g., 15 tubes) 8 , a header tank 9 and heat radiation fins 10 .
- tubes e.g., 15 tubes
- a header tank 9 e.g., heat radiation fins 10
- One end of each tube 8 in a tube longitudinal direction is attached to the heat radiation plate 6 B of the refrigerant container 2
- the other end of each tube 8 is attached to the header tank 9 , so that the plural tubes 8 communicate with each other through the header tank 9 .
- the radiation fins 10 such as corrugated fins are disposed between the adjacent tubes 8 .
- the header tank 9 is also a stack structure constructed by stacking plural plates (e.g., four plates) 6 as in the refrigerant container 2 .
- the attachment holes 6 a are not provided in the plural plates 6 , or are closed.
- One side ends of the tubes 8 are inserted into the openings 6 b of the heat radiation plate 6 B of the refrigerant container 2 to communicate the refrigerant chamber 7 , and the other side ends of the tubes 8 are inserted into the header tank 9 to communicate with the header tank 9 .
- the assemble body is integrally brazed in a vacuum, for example.
- the cooling device 1 according to the first embodiment will be now described. As shown in FIGS. 1 and 2, the cooling device 1 according to the first embodiment is used in a bottom posture where the heat-generating member 4 is located at a lower side of the refrigerant container 2 and the heat radiation core 3 is located at an upper side of the refrigerant container 2 .
- heat is transmitted from the heat-generating member 4 to refrigerant, and is further transferred to the heat radiation core 3 through the refrigerant. Thereafter, the heat is radiated as condensation latent heat while gas refrigerant is condensed in the heat radiation core 3 , and is discharged to atmospheric air through the heat radiation fins 10 .
- each of the refrigerant container 2 and the header tank 9 is constructed by stacking the plural plates (press material) 6 , and the plural plates 6 can be used in common for both the refrigerant container 2 and the header tank 9 . Therefore, each plate 6 used for the refrigerant container 2 and the corresponding plate 6 used for the header tank 9 can be formed by a common press die. Accordingly, the number of expensive press dies can be reduced, and production cost of the cooling device 1 can be largely reduced. Further, the kinds of the plates 6 can be reduced by the plural plates 6 used in common for both the refrigerant container 2 and the header tank 9 , thereby simplifying management of compartments of the cooling device.
- the capacity of the refrigerant container 2 and the capacity of the header tank 9 can be readily changed only by increasing and reducing the number of the plates 6 . Accordingly, the capacity of the refrigerant container 2 and the capacity of the header tank 9 can be readily changed in accordance with increase and decrease of thermal loads. In this case, since a new press die is not required even when the number of the plates 6 is increased, specifications for the cooling device can be readily changed in low cost, in the first embodiment.
- a surface area of the thermal conductor, formed by the metal portions of the intermediate plates 6 C, can be changed only by changing shapes of the slits 6 c thereof. Therefore, the heat radiation performance of the cooling device 1 can be increased without inner fins provided in the refrigerant chamber 7 of the refrigerant container 2 .
- each of the refrigerant container 2 and the header tank 9 has the stack structure, and the stoppers 6 d are provided in the intermediate plate 6 C. Therefore, the tubes 8 can be readily inserted at a predetermined position in the stack direction without using an additional member such as spacers. Accordingly, an insertion length of the tubes 8 inserted into the refrigerant container 2 and the header tank 9 can be readily regulated.
- FIGS. 5, 6 and 7 A- 7 D A second embodiment of the present invention will be described with reference to FIGS. 5, 6 and 7 A- 7 D.
- the present invention is used for a cooling device 1 where the tubes 8 cannot be disposed in the attachment area of the heat-generating member 4 , as shown in FIG. 5.
- the openings 6 b are provided in the heat radiation plate 6 B at both sides outside the attachment area of the heat-generating member 4 (area indicated by one-dot chain lines). That is, no opening 6 b is provided in the attachment area of the heat-generating member 4 .
- barrier portions 11 for restricting a flow of the condensed refrigerant (liquid refrigerant) returned from the header tank 9 to the refrigerant container 2 , are provided in the intermediate plates 6 c of the refrigerant container 2 .
- an intermediate plate 6 C having slits 6 c of the pattern A shown in FIG. 7B is stacked onto an intermediate plate 6 C having slits 6 c of the pattern B shown in FIG. 7C.
- the barrier portions 11 are formed by stacking metal portions of the intermediate plates 6 C.
- the refrigerant boiled by receiving the heat from the heat-generating member 4 , flows into the header tank 9 through the tubes 8 (first tube) around the attachment area of the heat-generating member 4 .
- the boiled refrigerant gas refrigerant
- the condensed refrigerant liquid refrigerant
- circulation roots of refrigerant are formed in the refrigerant container 2 by restricting the refrigerant flow using the barrier portions 11 .
- a size of the refrigerant container 2 is different from a size of the header tank 9 .
- the size of the header tank 9 is made smaller than the size of the refrigerant container 2 , and a refrigerant inlet pipe 12 , from which refrigerant is filled in the refrigerant container 2 (refrigerant chamber 7 ), is set in the refrigerant container 2 so as not to interfere with the header tank 9 . Accordingly, the refrigerant inlet pipe 12 can be readily provided in the refrigerant container 2 , while the tube insertion position can be accurately set.
- the present invention is used for a cooling device 1 where the capacity of the header tank 9 is made smaller than the capacity of the refrigerant container 2 as shown in FIG. 9.
- the cooling device 1 may be used in a bottom posture where the refrigerant container 2 is disposed horizontally and the heat-generating member 4 is attached onto the bottom surface of the refrigerant container 2 .
- the cooling device 1 may be used in a side posture where the refrigerant container 2 is disposed vertically and the heat-generating member 4 is attached to the refrigerant container 2 on its side surface.
- the cooling performance of the cooling device 1 is reduced when liquid refrigerant flows into the tubes 8 from the refrigerant container 2 . Therefore, the liquid refrigerant surface is need to be made lower as well as possible.
- the cooling device 1 is used in the side posture, refrigerant dries excessively around the heat-generating member 4 when the liquid refrigerant surface is made excessively lower. Therefore, liquid refrigerant surface is need to be set higher in accordance with an attachment position of the heat-generating member 4 .
- the capacity of the header tank 9 is need to be set smaller than the capacity of the refrigerant container 2 .
- FIGS. 12 - 15 A fifth embodiment of the present invention will be now described with reference to FIGS. 12 - 15 .
- the heat radiation fins 10 described in the above first embodiment are eliminated from a cooling device 1 .
- the heat radiation fins 10 are provided for increasing a heat radiation area on an air side and for improving the cooling performance of the cooling device 1 .
- an amount of cooling air passing through the cooling device is reduced by an excessive pressure loss in the heat radiation fins 10 .
- a noise is strongly required to be reduced while an excessively large electric load is required for the cooling fan.
- the heat radiation fins 10 are eliminated, thereby solving problems such as increase of the number of fin attachment processes and deviation of fin set positions in fin attachment work. Further, the pressure loss at the air side can be greatly reduced, thereby improving the cooling performance of the cooling device 1 and reducing the noises thereof. Furthermore, since the heat radiation fins 10 are eliminated, the tubes 8 can be set at arbitrary positions, respectively. For example, as shown in FIG. 12, the tubes 8 can be disposed in zigzag so as to efficiently radiate heat. For example, as shown in FIG.
- the tubes 8 can be disposed in zigzag so that the neighboring tubes 8 are not overlapped with each other in a direction perpendicular to the longitudinal direction of the heat radiation plate 6 B, thereby improving attachment performance of the tubes 8 .
- the heat radiation fins 10 can be partially provided between tubes 8 in a part of the tubes 8 .
- the number of the tubes 8 can be increased, thereby facilitating refrigerant circulation of the cooling device 1 , and effectively improving heat radiation performance thereof.
- the tube 8 has a sectional shape with high heat-transmitting efficiency such as an oval shape.
- the tube 8 may be a hollow pin.
- FIGS. 16 - 18 A sixth embodiment of the present invention will be now described with reference to FIGS. 16 - 18 .
- a first heat-generating member 4 is attached to the refrigerant container 2 and a second heat-generating member 13 is attached to the header tank 9 , as shown in FIG. 16. Since the header tank 9 has the stack structure identical to the stack structure of the refrigerant container 2 , the second heat-generating member 13 can be readily attached to the header tank 9 as in the refrigerant container 2 . Thus, both the heat-generating members 4 , 13 can be cooled by using the single cooling device 1 at the same time, thereby reducing total cost for this cooling system.
- barrier portions 11 11 A, 11 B for controlling each refrigerant flow are provided in the refrigerant container 2 and the header tank 9 , respectively, thereby facilitating the refrigerant circulation.
- the barrier portion 11 ( 11 A, 11 B) are provide to divide first tubes 8 A and second tubes 8 B in the tubes 8 .
- Gas refrigerant, boiled by receiving heat from the first heat-generating member 4 in the refrigerant container 2 flows toward the header tank 9 through the first tubes 8 A.
- Gas refrigerant, boiled by receiving heat from the second heat-generating member 13 in the header tank 9 flows toward the refrigerant container 2 through the second tubes 8 B.
- the first barrier portions 11 A are provided to restrict the gas refrigerant, boiled by receiving heat from the first heat-generating member 4 , from flowing into the second tubes 8 B.
- the second barrier portions 11 B are provided to restrict the gas refrigerant, boiled by receiving heat from the second heat-generating member 13 , from flowing into the first tubes 8 A.
- the gas refrigerant boiled in the refrigerant container 2 does not collide with the gas refrigerant boiled in the header tank 9 , and the gas refrigerant can satisfactorily circulate between the refrigerant container 2 and the header tank 9 . Therefore, the first and second heat-generating members 4 , 13 can be effectively cooled.
- each of the first and second barrier portions 11 A, 11 B can be readily provided by stacking the metal portions of the intermediate plates 6 C. That is, it is unnecessary to use additional members as the barrier portions 11 ( 11 A, 11 B).
- a seventh embodiment of the present invention will be now described with reference to FIG. 19.
- attachment structures between the tubes 8 and the refrigerant container 2 and between the tubes 8 and the header tank 9 are described.
- the plural plates 6 are connected to each other by brazing, they are need to be accurately pressed to each other.
- a notch 8 a is provided in the tube 8 at an end inserted into the opening 6 b of the heat radiation plate 6 B.
- the plates 6 can be accurately pressed to each other, thereby preventing brazing failure.
- each tube can be accurately inserted into the refrigerant container 2 at a predetermined position.
- the same attachment structure can be used for that between the header tank 9 and the tubes 8 . Even in this case, the same effect can be obtained.
- an insertion length of a gas refrigerant tube (gas tube) 8 C inserted into the header tank 9 is set different from that of a liquid refrigerant tube (liquid tube) 8 D inserted into the header tank 9 .
- gas refrigerant flows into the header tank 9 from the refrigerant container 2 through the gas tube 8 C.
- liquid refrigerant flows into the refrigerant container 2 from the header tank 9 through the liquid tube 8 D.
- an insertion length L 1 of the gas tube 8 C inserted into the header tank 9 is set larger than a plate thickness t 1 of the header tank 9 at the bottom side. That is, an upper end of the gas tube 8 C protrudes from an inner bottom surface of the header tank 9 inside the header tank 9 by a predetermined length.
- an insertion length L 2 of the liquid tube 8 D inserted into the header tank 9 is set substantially equal to the plate thickness t 1 . That is, an upper end of the liquid tube 8 D does not protrude to the inside of the header tank 9 from the inner surface of the header tank 9 .
- the cooling device 1 is used in the bottom posture where the refrigerant container 2 is disposed horizontally and the heat-generating member 4 is attached to the refrigerant container 2 on its bottom surface as shown in FIG. 22.
- the refrigerant stored in the refrigerant container 2 is boiled by receiving heat from the heat-generating member 4 in the refrigerant chamber 7 .
- the boiled gas refrigerant flows mainly through the gas tubes 8 C toward the header tank 9 , while being cooled and condensed, and the condensed refrigerant (liquid refrigerant) is returned into the refrigerant chamber 7 through the liquid tubes 8 D.
- the gas tubes 8 C protrude from the inner bottom surface of the header tank 9 to the inside thereof, the liquid refrigerant hardly flows into the gas tubes 8 C from the header tank 9 when refrigerant is returned from the header tank 9 to the refrigerant container 2 through the tubes 8 . Therefore, much of the liquid refrigerant is returned from the header tank 9 to the refrigerant container 2 through the liquid tubes 8 D. As a result, as shown in FIG. 21, much of the gas refrigerant in the refrigerant container 2 flows into the gas tubes 8 C.
- the refrigerant container 2 or the header tank 9 has the stack structure described in the above first embodiment.
- the present invention also can be used for a cooling device where the refrigerant container 2 has a hollow structure or has an inner fin.
- the gas tubes 8 C are attached to the refrigerant container 2 in an attachment area R of the heat-generating member 4 .
- the liquid tubes 8 D are attached to the refrigerant container 2 outside the attachment area R.
- the heat-generating member 4 is attached to the heat reception plate 6 A on an attachment area.
- the attachment area R is an area corresponding to the attachment area of the heat-generating member 4 on the heat radiation plate 6 B. Since the gas tubes 8 C are disposed in the attachment area R where refrigerant is readily boiled in the refrigerant container 2 , the gas refrigerant effectively flows into the gas tubes 8 C from the refrigerant container.
- the liquid tubes 8 D are disposed outside the attachment area R, thereby reducing an amount of gas refrigerant flowing into the liquid tubes 8 D from the refrigerant chamber 7 . Therefore, the refrigerant circulation can be realized more effectively than the above-described eighth embodiment, and the heat radiation performance of the cooling device 1 can be further improved.
- the barrier portions 11 for controlling gas refrigerant flow are provided in the refrigerant container 2 of a cooling device 1 according to the ninth embodiment. As shown in FIG. 24, the barrier portions 11 are provided between the gas tubes 8 C and the liquid tubes 8 D. The barrier portions 11 control the gas refrigerant, boiled by receiving the heat from the heat-generating member 4 , to not flow into the liquid tubes 9 B, thereby realizing the further preferable refrigerant circulation.
- the barrier portions 11 can be readily formed by changing the shapes of the intermediate plates 6 C.
- an insertion length of the gas tube 8 C inserted into the refrigerant container 2 is set different from an insertion length of the liquid tube 8 D inserted into the refrigerant container 2 .
- an insertion length L 3 of the gas tube 8 C into the refrigerant container 2 is set substantially equal to a plate thickness t 2 of the heat radiation plate 6 B. That is, a lower end of the gas tube 8 C does not protrude from the inner surface of the refrigerant container 2 to an inside thereof.
- the insertion length L 4 of the liquid tube 8 D is set larger than the plate thickness t 2 .
- a lower end of the liquid tube 8 D protrudes from the inner surface of the refrigerant container 2 to the inside thereof. Accordingly, when the gas refrigerant, boiled in the refrigerant container 2 , flows into the tubes 8 , the gas refrigerant does not flows into the liquid tubes 8 D but flows into the gas tubes 8 C. Therefore, the liquid refrigerant is readily returned from the header tank 9 into the refrigerant container 2 through the liquid tubes 8 D, and the gas refrigerant flowing through the liquid tubes 8 D can be restricted, thereby realizing the preferable refrigerant circulation.
- a twelfth embodiment of the present invention will be described with reference to FIG. 26.
- both the feature of the cooling device of the eleventh embodiment and the feature of the cooling device in the eighth embodiment are added.
- the insertion length of the gas tube 8 C inserted into the header tank 9 is set larger than the plate thickness of the bottom wall of the header tank 9
- the insertion length of the gas tube 8 C inserted into the refrigerant container 2 is set equal to the plate thickness of the heat radiation plate 6 B.
- the insertion length of the liquid tube 8 D inserted into the header tank 9 is set equal to the plate thickness of the header tank 9 at the bottom side, and the insertion length of the liquid tube 8 D inserted into the refrigerant container 2 is set larger than the plate thickness of the heat radiation plate 6 B of the refrigerant container 2 .
- the gas tubes 8 C are disposed in the attachment area R shown in FIG. 24, and the liquid tubes 8 D are disposed outside the attachment area R.
- FIGS. 27A- 27 B, and 28 - 29 A thirteenth embodiment of the present invention will be now described with reference to FIGS. 27 A- 27 B, and 28 - 29 .
- a joint structure between the header tank 9 and each tube 8 is formed as shown in FIGS. 27A, 27B. It is preferable that each tube 8 is attached to the header tank 9 while each upper end of the tubes 8 protrudes into the header tank 9 as shown in FIG. 28, for improving the brazing performance between the tubes 8 and the header tank 9 and for preventing an introduction of a brazing material into the tubes 8 .
- FIG. 28 In the attachment structure shown in FIG.
- each of the tubes 8 does not protrude into the header tank 9 , as shown in FIG. 29.
- the tubes 8 are attached to the header tank 9 , so that it can prevent the liquid refrigerant from being stored in the header tank 9 while preventing the brazing material from flowing into the tubes 8 .
- insertion holes 6 a for the tubes 8 are provided by burring in the header tank 9 . More specifically, the header tank 9 protrudes outside around each insertion hole 6 a so that a space S is provided between the inserted tube 8 and the header tank 9 . Here, the top end is set at a position approximately equal to the inner surface of the header tank 9 . Since the brazing material is stored in the space S provided around the tube 8 inserted to each insertion hole 6 a , it can be effectively prevented the brazing material from flowing into the tube 8 . Further, as shown in FIG. 27B, the insertion holes 6 a can be formed by pressing in the header tank 9 .
- a chamfer is provided around each insertion hole 6 a , thereby forming the space S on inner side of the header tank 9 .
- the chamfers may be provided by cutting. Even in this case, the same effect as that in FIG. 27 can be obtained.
- the tubes 8 are arranged relative to the refrigerant container 2 and the header tank 9 while being divided to upstream side tubes and downstream side tubes in a flow direction of cooling air. As shown in FIG. 30, even when the cooling device 1 is used in the side posture, refrigerant circulates as indicated by arrows, thereby improving the heat radiation performance of the cooling device 1 .
- the heat radiation performance can be improved.
- the liquid tubes 8 D are disposed at the upstream side of cooling air
- the gas tubes 8 C are disposed at the downstream side thereof, thereby further facilitating the refrigerant circulation. Since the gas tubes 8 C are disposed at the downstream side of cooling air, the gas tubes 8 C can be maintained at a temperature higher than the liquid tubes 8 D. Therefore, gas refrigerant flowing in the gas tubes 8 C can be prevented from being condensed therein, thereby maintaining the refrigerant circulation.
- the header tank 9 may be divided to two portions. That is, the heat radiation core 3 can be divided into plural parts in the flow direction of cooling air.
- Each tube 8 have plural through holes 34 a (e.g., circular through holes or rectangular through hoes) extending in the tube longitudinal direction, and both ends of the tube 8 are formed in the shape shown in FIG. 34.
- a side surface 8 b of the tube 8 is fitted to an inner surface 2 b of the insertion hole 2 a , and the top end of the tube 8 contacts a step surface 2 c of the insertion hole 2 a .
- the insertion length of the tube 2 inserted into the refrigerant container 2 is restricted.
- the insertion length of the tube 8 inserted into the header tank 9 is also restricted in the same manner.
- the insertion lengths of the tube 8 inserted into the refrigerant container 2 and the header tank 9 can be controlled using the insertion holes 2 a , 9 a provided in the refrigerant tank 2 and the header tank 9 while no notch 8 a shown in FIG. 19 is provided in the tube 8 at an end inserted into the insertion holes 2 a , 9 a . Since the insertion length can be regulated, the dimensions of the refrigerant container 2 and the header tank 9 can be reduced in the insertion direction of the tube 8 without closing the through holes 34 a of each tube 8 as shown in FIG. 37. In this embodiment, a dimension of each flat tube 8 in the tube thickness direction (up-down direction in FIG.
- each insertion hole 2 a , 9 a in the same direction as the up-down direction in FIG. 37 is set approximately equal to a dimension of each insertion hole 2 a , 9 a in the same direction as the up-down direction in FIG. 37.
- each of the dimension of the flat tube 8 and the dimension of the hole 2 a in the up-down direction of FIG. 37 is approximately 1.7 mm.
- the dimension between the step surface in the up-down direction in FIG. 36 is set at 1.5 mm, for example, and each diameter of the through holes 34 a is set at 1.1 mm, for example. Accordingly, even when the tube 8 is inserted into the insertion hole 2 a , 9 a , any through hole 34 a is not closed by the step surface 2 c , 9 c while the tube insertion length can be accurately controlled.
- each tube 8 can be enlarged, thereby improving the cooling performance (heat radiation performance). That is, as shown in FIG. 33A, since the step surfaces 2 c , 9 c of the insertion holes 2 a , 9 a are provided so as not to close a through hole 34 a of the tube 8 , respectively. Furthermore, the cooling device 1 can be temporarily assembled only by inserting the ends of the tubes 8 into the insertion holes 2 a , 9 a of the refrigerant container 2 and the header tank 9 without a complex (expensive) jig. Therefore, the cooling device 1 temporarily assembled can be readily integrally brazed, without using complex (expensive) brazing jig.
- the insertion hole 2 a , 9 a may be provided in the plate 6 B or may be provided in the intermediate plate 6 C.
- a step portion for regulating an insertion length of each tube 8 can be provided in the tubes 8 similarly to the above-described seventh embodiment (FIG. 19), while the refrigerant passage in each tube 8 is not closed. Even in this case, the insertion length of the tubes 8 inserted into the refrigerant container 2 or inserted into the header tank 9 can be suitably regulated.
- plate fins 14 may be used as the heat radiation fins 10 described in the above embodiments.
Abstract
A cooling device boiling and condensing refrigerant includes a refrigerant container, a header tank, and tubes between the refrigerant container and the header tank. In the cooling device, each of the refrigerant container and the header tank has a stack structure constructed by stacking plural plates. Each plate is a press member formed by punching a metal plate using a press die. Accordingly, each capacity of the refrigerant container and the header tank can be readily changed in accordance with a thermal load, and the plates having the same shape can be used in common for both the refrigerant container and the header tank.
Description
- This application is related to and claims priority from Japanese Patent Applications No. 2001-141014 filed on May 11, 2001, No. 2001-227260 filed on Jul. 27, 2001 and No. 2002-112563 filed on Apr. 15, 2002, the contents of which are hereby incorporated by reference.
- 1. Field of the Invention
- The present invention relates to a cooling device for cooling a heat-generating member by movement of latent heat based on boiling and condensation of refrigerant.
- 2. Description of Related Art
- As shown in FIG. 39, in a
conventional cooling device 100 constructed by arefrigerant container 110 and aheat radiation core 120, a heat-generatingmember 130 is attached to a heat reception plate of therefrigerant container 110. Theheat radiation core 120 is constructed by a pair ofheader tanks 121, plural tubes (heat radiation tubes) 122 andheat radiation fins 123. Theheader tanks 121 are attached to aheat radiation plate 111 of therefrigerant container 110 to be substantially perpendicular to theheat radiation plate 111. Each of thetubes 122 is disposed between theheader tanks 121 to communicate with theheader tanks 121. Refrigerant stored in therefrigerant container 110 is boiled and evaporated by receiving heat from the heat-generatingmember 130, and the evaporated refrigerant (gas refrigerant) flows into thetubes 122 from therefrigerant container 110 through theheader tanks 121. The gas refrigerant radiates heat to outside air and is condensed to be liquid refrigerant while flowing through thetubes 122, and the condensed refrigerant (liquid refrigerant) is returned into therefrigerant container 110. Thus, the heat-generatingmember 130 is cooled. - In the
cooling device 100, when thetube 122 is inserted deeply into theheader tank 121, an opening of thetube 122 may be closed by an inner surface of theheader tank 121. When the thickness of theheader tank 121 is set larger in order to prevent the opening of thetube 122 from being closed, the capacity of thetubes 122 is reduced, and heat radiation performance of theheat radiation core 120 is also reduced, thereby reducing cooling performance of thecooling device 100. In addition, when thecooling device 100 is used in a bottom posture where the heat-generatingmember 130 is positioned under therefrigerant container 110, refrigerant circulation fails and heat radiation performance is reduced. - In view of the foregoing problems, it is an object of the present invention to provide a cooling device which improves a refrigerant circulation by reducing interference between gas refrigerant and liquid refrigerant in tubes, so that cooling performance is improved.
- It is an another object of the present invention to provide a cooling device where cooling performance can be improved while a thickness of a header tank is reduced.
- It is a further another object of the present invention to provide a cooling device where a capacity of a header tank can be readily changed and production cost can be reduced, while the cooling capacity can be improved.
- According to the present invention, in a cooling device for cooling a heat-generating member by boiling and condensing refrigerant, refrigerant is boiled by receiving heat from a heat-generating member attached to a refrigerant container, and flows into a header tank through plural tubes to radiate heat to outside in a heat radiation core. In the cooling device, the refrigerant container is constructed by stacking a plurality of plates to define a space where refrigerant is stored, and the header tank is also constructed by stacking a plurality of plates. Therefore, the plates having the same shape can be used in common for both the refrigerant container and the header tank, and the cooling device can be manufactured in low cost. In addition, in the cooling device, the capacity of the header tank or the refrigerant container can be readily changed in accordance with a thermal load in the heat-generating member, only by increasing or decreasing the number of the plates. Accordingly, cooling performance in the cooling device can be improved while being manufactured in low cost.
- Preferably, the plurality of tubes includes first tubes through which refrigerant flows from the refrigerant container to the header tank and second tubes through which refrigerant flows from the header tank to the refrigerant container. Further, a first barrier portion, for restricting refrigerant from flowing into the second tube, is provided in the refrigerant container, and a second barrier portion, for restricting refrigerant from flowing into the first tube, is provided in the header tank. Accordingly, gas refrigerant, boiled by receiving heat from the heat-generating member in the refrigerant container flows into the first tubes, and liquid refrigerant in the header tank can be returned into the refrigerant container through the second tubes. Therefore, it can restrict an interference between the gas refrigerant from the refrigerant container to the header tank, and the liquid refrigerant from the header tank to the refrigerant container, thereby improving refrigerant circulation and cooling performance.
- Alternatively, in the cooling device, the plurality of tubes includes first tubes each having an insertion length inserted into the header tank, and second tubes each having an insertion length inserted into the header tank, smaller than that of each first tube. Each first tube protrudes from an inner surface of the header tank inside the header tank by a predetermined length. Accordingly, an amount of liquid refrigerant introduced into the first tubes from the header tank is reduced. On the contrary, an amount of liquid refrigerant introduced into the second tubes from the header tank is increased. As a result, the amount of gas refrigerant flowing into the first tubes from the refrigerant container is increased, thereby improving the refrigerant circulation.
- Preferably, the header tank includes a first plate defining a plurality of first holes into which the tubes are inserted, and a second plate on which the first plate is stacked. The second plate defines a plurality of second holes each having an open area smaller than an open area of each first hole, and the tube is inserted into the first hole to contact the second plate around the second hole to communicate with the second hole. Accordingly, each tube can be readily positioned at a predetermined position in a stack direction of the plates without using an additional part such as spacers. Therefore, it can prevent an opening portion in each tube from contacting an inner surface of the header tank, while the thickness of the header tank can be reduced.
- Additional objects and advantages of the present invention will be more readily apparent from the following detailed description of preferred embodiments when taken together with the accompanying drawings, in which:
- FIG. 1 is a schematic side view showing a cooling device according to a first embodiment of the present invention;
- FIG. 2 is a schematic sectional view showing the cooling device taken along line II-II in FIG. 1;
- FIG. 3A is a plan view showing a heat radiation plate constructing a refrigerant container of the cooling device,
- FIG. 3B is a plan view showing an intermediate plate constructing the refrigerant container,
- FIG. 3C is a plan view showing an intermediate plate constructing the refrigerant container, and
- FIG. 3D is a plan view showing a heat reception plate constructing the refrigerant container, according to the first embodiment;
- FIG. 4 is a sectional view showing a stopper structure of the refrigerant container according to the first embodiment;
- FIG. 5 is a schematic side view showing a cooling device according to a second embodiment of the present invention;
- FIG. 6 is a schematic sectional view of the cooling device taken along line VI-VI in FIG. 5;
- FIG. 7A is a plan view showing a heat radiation plate constructing a refrigerant container of the cooling device according to the second embodiment,
- FIG. 7B is a plan view showing an intermediate plate constructing the refrigerant container,
- FIG. 7C is a plan view showing an intermediate plate constructing the refrigerant container, and
- FIG. 7D is a plan view showing a heat reception plate constructing the refrigerant container;
- FIG. 8 is a schematic side view showing a cooling device according to a third embodiment of the present invention;
- FIG. 9 is a schematic side view showing a cooling device according to a fourth embodiment of the present invention;
- FIG. 10 is a schematic sectional view showing the cooling device, used in a bottom posture, taken along line X-X in FIG. 9;
- FIG. 11 is a schematic sectional view showing the cooling device, used in a side posture, in FIG. 9;
- FIG. 12 is a plan view showing a heat radiation plate according to a fifth embodiment of the present invention;
- FIG. 13 is a plan view showing an another heat radiation plate according to the fifth embodiment;
- FIG. 14 is a plan view showing an another heat radiation plate according to the fifth embodiment;
- FIG. 15 is a plan view showing an another heat radiation plate according to the fifth embodiment;
- FIG. 16 is a schematic side view showing a cooling device according to a sixth embodiment of the present invention;
- FIG. 17 is a schematic sectional view showing the cooling device according to the sixth embodiment;
- FIG. 18 is a schematic sectional view showing the cooling device taken along line XVIII-XVIII in FIG. 16;
- FIG. 19 is a schematic sectional view showing a stopper structure in a refrigerant container of a cooling device according to a seventh embodiment of the present invention;
- FIG. 20 is a schematic sectional view showing a part of a cooling device around an attachment portion between tubes and a header tank according to an eighth embodiment of the present invention;
- FIG. 21 is a schematic sectional view showing a part of the cooling device around an attachment portion of tubes and a refrigerant container according to the eighth embodiment;
- FIG. 22 is a perspective view showing the cooling device according to the eighth embodiment;
- FIG. 23 is a schematic sectional view showing a cooling device according to a ninth embodiment of the present invention;
- FIG. 24 is a schematic sectional view showing a cooling device according to a tenth embodiment of the present invention;
- FIG. 25 is a schematic sectional view showing a part of a cooling device around an attachment portion of tubes and a refrigerant container, according to an eleventh embodiment of the present invention;
- FIG. 26 is a schematic sectional view showing a cooling device according to a twelfth embodiment of the present invention;
- FIG. 27A is a schematic sectional view showing an insertion structure of a tube into a header tank of a cooling device according to a thirteenth embodiment of the present invention, and
- FIG. 27B is a schematic sectional view showing another insertion structure of the tube into the header tank according to the thirteenth embodiment;
- FIG. 28 is a schematic sectional view showing a part of a reference cooling device around an attachment portion of tubes and a header tank, for explaining the thirteenth embodiment;
- FIG. 29 is a schematic sectional view showing a part of an another reference cooling device for explaining the thirteenth embodiment;
- FIG. 30 is a schematic sectional view showing a cooling device, used in a side posture, according to a fourteenth embodiment of the present invention;
- FIG. 31 is a schematic sectional view showing a cooling device, used in a bottom posture, according to the fourteenth embodiment;
- FIG. 32 is a schematic sectional view showing a cooling device having two header tanks divided from each other, according the fourteenth embodiment;
- FIG. 33A is a schematic diagram showing an insertion state of a tube into a refrigerant container and a header tank in a fifteenth embodiment of the present invention, and
- FIG. 33B is a schematic sectional view showing a part of the refrigerant container according to the fifteenth embodiment;
- FIG. 34 is a plan view showing an end surface of a tube according to the fifteenth embodiment;
- FIG. 35 is a side view showing a part of the refrigerant container when being viewed from an arrow B in FIG. 33B;
- FIG. 36 is a sectional view showing a part of the refrigerant container taken along line XXXVI-XXXVI in FIG. 35;
- FIG. 37 is a schematic diagram showing a tube insertion state when being viewed from arrow A in FIG. 33A;
- FIG. 38 is a schematic sectional view showing a cooling device according to a modification of the present invention; and
- FIG. 39 is a perspective view showing a conventional cooling device.
- Preferred embodiments of the present invention will be described hereinafter with reference to the accompanying drawings.
- A first embodiment of the present invention will be now described with reference to FIGS.1-4. As shown in FIG. 1, a
cooling device 1 according to the first embodiment is constructed by arefrigerant container 2 and aheat radiation core 3. In thecooling device 1, a heat-generatingmember 4 is fixed to a bottom surface of therefrigerant container 2 substantially at a center by usingscrews 5. For example, the heat-generatingmember 4 is a computer chip mounted on a printed circuit board. Further, therefrigerant container 2 has a stack structure constructed by stacking plural plates 6, for example, four plates 6. - FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1. The
refrigerant container 2 defines arefrigerant chamber 7 therein as shown in FIG. 2, and a predetermined amount of refrigerant is stored in therefrigerant chamber 7. In FIGS. 3A-3D, each plate 6 (6A, 6B, 6C, 6D) is a press member formed by punching a metal plate such as an aluminum plate or a stainless steel plate using a press die. Further, the metal plate may be a brazing sheet where a brazing material layer is beforehand provided on a surface of a metal sheet. Specifically, the plates 6 include aheat reception plate 6A, aheat radiation plate 6B and two (three or more)intermediate plates 6C. Theheat reception plate 6A and theheat radiation plate 6B are disposed at both outside of therefrigerant container 2, and theintermediate plates 6C are sandwiched between theoutside plates - As shown in FIGS.3A-3D, four
attachment holes 6 a, into which the screws are screwed for fixing the heat-generatingmember 4 to theheat reception plate 6A, are provided in each of the plates 6 as through holes in a stack direction of the plates 6.Plural openings 6 b, into whichtubes 8 of theheat radiation core 3 are inserted, are provided in theheat radiation plate 6B, as shown in FIG. 3A. As shown in FIGS. 3B, 3C,plural slits 6 c are provided in two patterns A, B in theintermediate plates 6C substantially over all the surface, respectively. In the pattern A shown in FIG. 3B, theslits 6 c are provided to extend in a longitudinal direction of theintermediate plate 6C. In the pattern B shown in FIG. 3C, theslits 6 c are provided to extend in a direction perpendicular to the longitudinal direction of theintermediate plate 6C. Theslits 6 c of the pattern A and theslits 6 c of the pattern B are provided to communicate with each other, and to define therefrigerant chamber 7. Further, metal portions are provided between theslits 6 c, to form a thermal conductor in the stack direction of theintermediate plates 6C when theintermediate plates 6C are stacked. Theheat reception plate 6A and theheat radiation plate 6B are thermally connected to each other by the thermal conductor of theintermediate plates 6C. - The
intermediate plate 6C with the pattern A shown in FIG. 3B, stacked with theheat radiation plate 6B, includestube stoppers 6 d (metal portions) each for stopping a further insertion of thetube 8 inserted into theopening 6 b of theheat radiation plate 6B. Specifically, as shown in FIG. 4, when theintermediate plate 6C is stacked with theheat radiation plate 6B, a part of the metal portion (where theslit 6 c is not provided) of theintermediate plate 6C covering theopening 6 b is used as thestopper 6 d, in theopening 6 b of theheat radiation plate 6B. Thus, thetube 8, inserted into theopening 6 b of theheat radiation plate 6B, contacts thestopper 6 d and is positioned at a predetermined position in the stack direction of the plates 6. - For example, the
heat radiation core 3 is constructed by plural tubes (e.g., 15 tubes) 8, aheader tank 9 andheat radiation fins 10. One end of eachtube 8 in a tube longitudinal direction is attached to theheat radiation plate 6B of therefrigerant container 2, and the other end of eachtube 8 is attached to theheader tank 9, so that theplural tubes 8 communicate with each other through theheader tank 9. Theradiation fins 10 such as corrugated fins are disposed between theadjacent tubes 8. Theheader tank 9 is also a stack structure constructed by stacking plural plates (e.g., four plates) 6 as in therefrigerant container 2. In theheader tank 9, the attachment holes 6 a are not provided in the plural plates 6, or are closed. One side ends of thetubes 8 are inserted into theopenings 6 b of theheat radiation plate 6B of therefrigerant container 2 to communicate therefrigerant chamber 7, and the other side ends of thetubes 8 are inserted into theheader tank 9 to communicate with theheader tank 9. After thecooling device 1 is temporarily assembled to an assemble body, the assemble body is integrally brazed in a vacuum, for example. - Next, the
cooling device 1 according to the first embodiment will be now described. As shown in FIGS. 1 and 2, thecooling device 1 according to the first embodiment is used in a bottom posture where the heat-generatingmember 4 is located at a lower side of therefrigerant container 2 and theheat radiation core 3 is located at an upper side of therefrigerant container 2. - Refrigerant stored in the refrigerant container2 (refrigerant chamber 7) is boiled and evaporated by receiving heat from the heat-generating
member 4, and flows from therefrigerant chamber 7 into theheader tank 9 mainly through thetubes 8 positioned in an attachment area of the heat-generating member 4 (i.e., area indicated by one-dot chain lines in FIG. 3A). The gas refrigerant flowing toward theheader tank 9 through thetubes 8 is cooled and condensed while being distributed in theheader tank 9. The condensed refrigerant (liquid refrigerant) is returned to therefrigerant chamber 7 through thetubes 8 disposed outside the attachment area of the heat-generatingmember 4. Thus, heat is transmitted from the heat-generatingmember 4 to refrigerant, and is further transferred to theheat radiation core 3 through the refrigerant. Thereafter, the heat is radiated as condensation latent heat while gas refrigerant is condensed in theheat radiation core 3, and is discharged to atmospheric air through theheat radiation fins 10. - Next, operational effects of the first embodiment will be described. In the
cooling device 1 according to the first embodiment, each of therefrigerant container 2 and theheader tank 9 is constructed by stacking the plural plates (press material) 6, and the plural plates 6 can be used in common for both therefrigerant container 2 and theheader tank 9. Therefore, each plate 6 used for therefrigerant container 2 and the corresponding plate 6 used for theheader tank 9 can be formed by a common press die. Accordingly, the number of expensive press dies can be reduced, and production cost of thecooling device 1 can be largely reduced. Further, the kinds of the plates 6 can be reduced by the plural plates 6 used in common for both therefrigerant container 2 and theheader tank 9, thereby simplifying management of compartments of the cooling device. - In addition, the capacity of the
refrigerant container 2 and the capacity of theheader tank 9 can be readily changed only by increasing and reducing the number of the plates 6. Accordingly, the capacity of therefrigerant container 2 and the capacity of theheader tank 9 can be readily changed in accordance with increase and decrease of thermal loads. In this case, since a new press die is not required even when the number of the plates 6 is increased, specifications for the cooling device can be readily changed in low cost, in the first embodiment. - Further, a surface area of the thermal conductor, formed by the metal portions of the
intermediate plates 6C, can be changed only by changing shapes of theslits 6 c thereof. Therefore, the heat radiation performance of thecooling device 1 can be increased without inner fins provided in therefrigerant chamber 7 of therefrigerant container 2. Further, as shown in FIG. 4, each of therefrigerant container 2 and theheader tank 9 has the stack structure, and thestoppers 6 d are provided in theintermediate plate 6C. Therefore, thetubes 8 can be readily inserted at a predetermined position in the stack direction without using an additional member such as spacers. Accordingly, an insertion length of thetubes 8 inserted into therefrigerant container 2 and theheader tank 9 can be readily regulated. - A second embodiment of the present invention will be described with reference to FIGS. 5, 6 and7A-7D. In the second embodiment, the present invention is used for a
cooling device 1 where thetubes 8 cannot be disposed in the attachment area of the heat-generatingmember 4, as shown in FIG. 5. As shown in FIG. 7B, theopenings 6 b are provided in theheat radiation plate 6B at both sides outside the attachment area of the heat-generating member 4 (area indicated by one-dot chain lines). That is, noopening 6 b is provided in the attachment area of the heat-generatingmember 4. Further,barrier portions 11, for restricting a flow of the condensed refrigerant (liquid refrigerant) returned from theheader tank 9 to therefrigerant container 2, are provided in theintermediate plates 6 c of therefrigerant container 2. Specifically, anintermediate plate 6 C having slits 6 c of the pattern A shown in FIG. 7B is stacked onto anintermediate plate 6 C having slits 6 c of the pattern B shown in FIG. 7C. Thebarrier portions 11 are formed by stacking metal portions of theintermediate plates 6C. - Accordingly, as shown in FIG. 6, the refrigerant, boiled by receiving the heat from the heat-generating
member 4, flows into theheader tank 9 through the tubes 8 (first tube) around the attachment area of the heat-generatingmember 4. The boiled refrigerant (gas refrigerant) is cooled and condensed while being distributed into theheader tank 9, and the condensed refrigerant (liquid refrigerant) is returned to therefrigerant container 2 through the tubes 8 (second tubes) away from the attachment area. As indicated by broken-line arrows in FIG. 7C, circulation roots of refrigerant are formed in therefrigerant container 2 by restricting the refrigerant flow using thebarrier portions 11. Thus, refrigerant circulation is facilitated, and heat radiation performance can be improved. - A third embodiment of the present invention will be now described with reference to FIG. 8, In a
cooling device 1 of the third embodiment, a size of therefrigerant container 2 is different from a size of theheader tank 9. Specifically, as shown in FIG. 8, the size of theheader tank 9 is made smaller than the size of therefrigerant container 2, and arefrigerant inlet pipe 12, from which refrigerant is filled in the refrigerant container 2 (refrigerant chamber 7), is set in therefrigerant container 2 so as not to interfere with theheader tank 9. Accordingly, therefrigerant inlet pipe 12 can be readily provided in therefrigerant container 2, while the tube insertion position can be accurately set. - A fourth embodiment of the present invention will be now described with reference to FIGS.9-11. In the fourth embodiment, the present invention is used for a
cooling device 1 where the capacity of theheader tank 9 is made smaller than the capacity of therefrigerant container 2 as shown in FIG. 9. Further, as shown in FIG. 10, thecooling device 1 may be used in a bottom posture where therefrigerant container 2 is disposed horizontally and the heat-generatingmember 4 is attached onto the bottom surface of therefrigerant container 2. Alternatively, as shown in FIG. 11, thecooling device 1 may be used in a side posture where therefrigerant container 2 is disposed vertically and the heat-generatingmember 4 is attached to therefrigerant container 2 on its side surface. When thecooling device 1 is used in the bottom posture, the cooling performance of thecooling device 1 is reduced when liquid refrigerant flows into thetubes 8 from therefrigerant container 2. Therefore, the liquid refrigerant surface is need to be made lower as well as possible. On the other hand, when thecooling device 1 is used in the side posture, refrigerant dries excessively around the heat-generatingmember 4 when the liquid refrigerant surface is made excessively lower. Therefore, liquid refrigerant surface is need to be set higher in accordance with an attachment position of the heat-generatingmember 4. In view of the above-described problem, the capacity of theheader tank 9 is need to be set smaller than the capacity of therefrigerant container 2. - Specifically, when the
cooling device 1 is used in the side posture shown in FIG. 11, liquid refrigerant enters into theheader tank 9 and therefrigerant container 2. Therefore, as the capacity of theheader tank 9 increases, the liquid refrigerant surface in therefrigerant container 2 becomes lower. The liquid refrigerant surface in therefrigerant container 2 can be increased by reducing the capacity of theheader tank 9. Further, refrigerant in therefrigerant container 2 is need to be boiled, and heat from the heat-generatingmember 4 is need to be transmitted to refrigerant through therefrigerant container 2. Therefore, it is necessary to enlarge the capacity of therefrigerant container 2. - That is, in the fourth embodiment, by setting the capacity of the
header tank 9 to be smaller than the capacity of therefrigerant container 2, sufficient cooling performance can be obtained in both the bottom posture and the side posture of thecooling unit 1. - A fifth embodiment of the present invention will be now described with reference to FIGS.12-15. In the fifth embodiment, the
heat radiation fins 10 described in the above first embodiment are eliminated from acooling device 1. Generally, theheat radiation fins 10 are provided for increasing a heat radiation area on an air side and for improving the cooling performance of thecooling device 1. However, an amount of cooling air passing through the cooling device is reduced by an excessive pressure loss in theheat radiation fins 10. Especially in a cooler for a personal computer, a server and the like used in an office, a noise is strongly required to be reduced while an excessively large electric load is required for the cooling fan. - In the fifth embodiment, the
heat radiation fins 10 are eliminated, thereby solving problems such as increase of the number of fin attachment processes and deviation of fin set positions in fin attachment work. Further, the pressure loss at the air side can be greatly reduced, thereby improving the cooling performance of thecooling device 1 and reducing the noises thereof. Furthermore, since theheat radiation fins 10 are eliminated, thetubes 8 can be set at arbitrary positions, respectively. For example, as shown in FIG. 12, thetubes 8 can be disposed in zigzag so as to efficiently radiate heat. For example, as shown in FIG. 13, thetubes 8 can be disposed in zigzag so that the neighboringtubes 8 are not overlapped with each other in a direction perpendicular to the longitudinal direction of theheat radiation plate 6B, thereby improving attachment performance of thetubes 8. For example, as shown in FIG. 14, theheat radiation fins 10 can be partially provided betweentubes 8 in a part of thetubes 8. - When no
heat radiation fin 10 is used, the number of thetubes 8 can be increased, thereby facilitating refrigerant circulation of thecooling device 1, and effectively improving heat radiation performance thereof. Thetube 8 has a sectional shape with high heat-transmitting efficiency such as an oval shape. For example, as shown in FIG. 15, thetube 8 may be a hollow pin. - A sixth embodiment of the present invention will be now described with reference to FIGS.16-18. In a
cooling device 1 of the sixth embodiment, a first heat-generatingmember 4 is attached to therefrigerant container 2 and a second heat-generatingmember 13 is attached to theheader tank 9, as shown in FIG. 16. Since theheader tank 9 has the stack structure identical to the stack structure of therefrigerant container 2, the second heat-generatingmember 13 can be readily attached to theheader tank 9 as in therefrigerant container 2. Thus, both the heat-generatingmembers single cooling device 1 at the same time, thereby reducing total cost for this cooling system. However, when the second heat-generatingmember 13 is also attached to theheader tank 9, gas refrigerant generated in theheader tank 9 collides with gas refrigerant generated in therefrigerant container 2, so that refrigerant circulation may fail. Therefore, the refrigerant flow is need to be carefully controlled to prevent the refrigerant circulation failure. - In the sixth embodiment, as shown in FIGS. 17, 18, barrier portions11 (11A, 11B) for controlling each refrigerant flow are provided in the
refrigerant container 2 and theheader tank 9, respectively, thereby facilitating the refrigerant circulation. - Specifically, as shown in FIG. 17, the barrier portion11 (11A, 11B) are provide to divide
first tubes 8A andsecond tubes 8B in thetubes 8. Gas refrigerant, boiled by receiving heat from the first heat-generatingmember 4 in therefrigerant container 2, flows toward theheader tank 9 through thefirst tubes 8A. Gas refrigerant, boiled by receiving heat from the second heat-generatingmember 13 in theheader tank 9, flows toward therefrigerant container 2 through thesecond tubes 8B. In therefrigerant container 2, thefirst barrier portions 11A are provided to restrict the gas refrigerant, boiled by receiving heat from the first heat-generatingmember 4, from flowing into thesecond tubes 8B. In theheader tank 9, thesecond barrier portions 11B are provided to restrict the gas refrigerant, boiled by receiving heat from the second heat-generatingmember 13, from flowing into thefirst tubes 8A. Thus, as indicated by arrows in FIGS. 17, 18, the gas refrigerant boiled in therefrigerant container 2 does not collide with the gas refrigerant boiled in theheader tank 9, and the gas refrigerant can satisfactorily circulate between therefrigerant container 2 and theheader tank 9. Therefore, the first and second heat-generatingmembers second barrier portions intermediate plates 6C. That is, it is unnecessary to use additional members as the barrier portions 11 (11A, 11B). - A seventh embodiment of the present invention will be now described with reference to FIG. 19. In the seventh embodiment, attachment structures between the
tubes 8 and therefrigerant container 2 and between thetubes 8 and theheader tank 9 are described. Here, when the plural plates 6 are connected to each other by brazing, they are need to be accurately pressed to each other. In the seventh embodiment, as shown in FIG. 19, anotch 8 a is provided in thetube 8 at an end inserted into theopening 6 b of theheat radiation plate 6B. When a pressure is applied to the plates 6 through thenotch 8 a in eachtube 8, the plates 6 can be accurately pressed to each other, thereby preventing brazing failure. Further, through thenotch 8 a, each tube can be accurately inserted into therefrigerant container 2 at a predetermined position. The same attachment structure can be used for that between theheader tank 9 and thetubes 8. Even in this case, the same effect can be obtained. - An eighth embodiment of the present invention will be now described with reference to FIGS.20-22. In the eighth embodiment, an insertion length of a gas refrigerant tube (gas tube) 8C inserted into the
header tank 9 is set different from that of a liquid refrigerant tube (liquid tube) 8D inserted into theheader tank 9. As shown in FIG. 20, gas refrigerant flows into theheader tank 9 from therefrigerant container 2 through thegas tube 8C. As shown in FIG. 21, liquid refrigerant flows into therefrigerant container 2 from theheader tank 9 through theliquid tube 8D. Specifically, as shown in FIG. 20, an insertion length L1 of thegas tube 8C inserted into theheader tank 9 is set larger than a plate thickness t1 of theheader tank 9 at the bottom side. That is, an upper end of thegas tube 8C protrudes from an inner bottom surface of theheader tank 9 inside theheader tank 9 by a predetermined length. On the other hand, an insertion length L2 of theliquid tube 8D inserted into theheader tank 9 is set substantially equal to the plate thickness t1. That is, an upper end of theliquid tube 8D does not protrude to the inside of theheader tank 9 from the inner surface of theheader tank 9. - Next, operation of the
cooling device 1 according to the eighth embodiment will be now described. In the eighth embodiment, thecooling device 1 is used in the bottom posture where therefrigerant container 2 is disposed horizontally and the heat-generatingmember 4 is attached to therefrigerant container 2 on its bottom surface as shown in FIG. 22. The refrigerant stored in therefrigerant container 2 is boiled by receiving heat from the heat-generatingmember 4 in therefrigerant chamber 7. The boiled gas refrigerant flows mainly through thegas tubes 8C toward theheader tank 9, while being cooled and condensed, and the condensed refrigerant (liquid refrigerant) is returned into therefrigerant chamber 7 through theliquid tubes 8D. - Since the
gas tubes 8C protrude from the inner bottom surface of theheader tank 9 to the inside thereof, the liquid refrigerant hardly flows into thegas tubes 8C from theheader tank 9 when refrigerant is returned from theheader tank 9 to therefrigerant container 2 through thetubes 8. Therefore, much of the liquid refrigerant is returned from theheader tank 9 to therefrigerant container 2 through theliquid tubes 8D. As a result, as shown in FIG. 21, much of the gas refrigerant in therefrigerant container 2 flows into thegas tubes 8C. Therefore, a flow amount of the gas refrigerant flowing into theliquid tubes 8D in therefrigerant container 2 can be made smaller, thereby realizing a preferable refrigerant circulation in thecooling device 1. Even in the eighth embodiment, therefrigerant container 2 or theheader tank 9 has the stack structure described in the above first embodiment. - In the eighth embodiment, the present invention also can be used for a cooling device where the
refrigerant container 2 has a hollow structure or has an inner fin. - A ninth embodiment of the present invention will be now described with reference to FIG. 23. In the ninth embodiment, the
gas tubes 8C are attached to therefrigerant container 2 in an attachment area R of the heat-generatingmember 4. Theliquid tubes 8D are attached to therefrigerant container 2 outside the attachment area R. Specifically, as shown in FIG. 23, the heat-generatingmember 4 is attached to theheat reception plate 6A on an attachment area. Here, the attachment area R is an area corresponding to the attachment area of the heat-generatingmember 4 on theheat radiation plate 6B. Since thegas tubes 8C are disposed in the attachment area R where refrigerant is readily boiled in therefrigerant container 2, the gas refrigerant effectively flows into thegas tubes 8C from the refrigerant container. Further, theliquid tubes 8D are disposed outside the attachment area R, thereby reducing an amount of gas refrigerant flowing into theliquid tubes 8D from therefrigerant chamber 7. Therefore, the refrigerant circulation can be realized more effectively than the above-described eighth embodiment, and the heat radiation performance of thecooling device 1 can be further improved. - A tenth embodiment of the present invention will be now described with reference to FIG. 24. In the tenth embodiment, the
barrier portions 11 for controlling gas refrigerant flow, described in the second embodiment, are provided in therefrigerant container 2 of acooling device 1 according to the ninth embodiment. As shown in FIG. 24, thebarrier portions 11 are provided between thegas tubes 8C and theliquid tubes 8D. Thebarrier portions 11 control the gas refrigerant, boiled by receiving the heat from the heat-generatingmember 4, to not flow into the liquid tubes 9B, thereby realizing the further preferable refrigerant circulation. In the tenth embodiment, thebarrier portions 11 can be readily formed by changing the shapes of theintermediate plates 6C. - An eleventh embodiment of the present invention will be now described with reference to FIG. 25. In the eleventh embodiment, an insertion length of the
gas tube 8C inserted into therefrigerant container 2 is set different from an insertion length of theliquid tube 8D inserted into therefrigerant container 2. Specifically, as shown in FIG. 25, an insertion length L3 of thegas tube 8C into therefrigerant container 2 is set substantially equal to a plate thickness t2 of theheat radiation plate 6B. That is, a lower end of thegas tube 8C does not protrude from the inner surface of therefrigerant container 2 to an inside thereof. The insertion length L4 of theliquid tube 8D is set larger than the plate thickness t2. That is, a lower end of theliquid tube 8D protrudes from the inner surface of therefrigerant container 2 to the inside thereof. Accordingly, when the gas refrigerant, boiled in therefrigerant container 2, flows into thetubes 8, the gas refrigerant does not flows into theliquid tubes 8D but flows into thegas tubes 8C. Therefore, the liquid refrigerant is readily returned from theheader tank 9 into therefrigerant container 2 through theliquid tubes 8D, and the gas refrigerant flowing through theliquid tubes 8D can be restricted, thereby realizing the preferable refrigerant circulation. - A twelfth embodiment of the present invention will be described with reference to FIG. 26. In the twelfth embodiment, both the feature of the cooling device of the eleventh embodiment and the feature of the cooling device in the eighth embodiment are added. Specifically, as shown in FIG. 26, the insertion length of the
gas tube 8C inserted into theheader tank 9 is set larger than the plate thickness of the bottom wall of theheader tank 9, and the insertion length of thegas tube 8C inserted into therefrigerant container 2 is set equal to the plate thickness of theheat radiation plate 6B. In addition, the insertion length of theliquid tube 8D inserted into theheader tank 9 is set equal to the plate thickness of theheader tank 9 at the bottom side, and the insertion length of theliquid tube 8D inserted into therefrigerant container 2 is set larger than the plate thickness of theheat radiation plate 6B of therefrigerant container 2. Thegas tubes 8C are disposed in the attachment area R shown in FIG. 24, and theliquid tubes 8D are disposed outside the attachment area R. - Accordingly, much of the gas refrigerant, boiled in the
refrigerant container 2, flows into thegas tubes 8C, and much of the liquid refrigerant in theheader tank 9 flows into theliquid tubes 8D, thereby effectively forming a refrigerant-circulation cycle, and realizing thecooling device 1 having high heat radiation performance. Further, an entire length of thegas tube 8C can be set equal to an entire length of theliquid tube 8D in FIG. 26. In this case, the management of components of thecooling device 1 can be simplified, and troubles such as assembling errors can be eliminated. - A thirteenth embodiment of the present invention will be now described with reference to FIGS.27A-27B, and 28-29. In the thirteenth embodiment, a joint structure between the
header tank 9 and eachtube 8 is formed as shown in FIGS. 27A, 27B. It is preferable that eachtube 8 is attached to theheader tank 9 while each upper end of thetubes 8 protrudes into theheader tank 9 as shown in FIG. 28, for improving the brazing performance between thetubes 8 and theheader tank 9 and for preventing an introduction of a brazing material into thetubes 8. However, in the attachment structure shown in FIG. 28, liquid refrigerant is stored in theheader tank 9, thereby reducing an amount of the liquid refrigerant returned into therefrigerant container 2 from theheader tank 9, and reducing the heat radiation performance of thecooling device 1. In order to prevent the liquid refrigerant from being stored in theheader tank 9, it is preferable that each of thetubes 8 does not protrude into theheader tank 9, as shown in FIG. 29. - According to the thirteenth embodiment of the present invention, the
tubes 8 are attached to theheader tank 9, so that it can prevent the liquid refrigerant from being stored in theheader tank 9 while preventing the brazing material from flowing into thetubes 8. - Specifically, as shown in FIG. 27A, insertion holes6 a for the
tubes 8 are provided by burring in theheader tank 9. More specifically, theheader tank 9 protrudes outside around eachinsertion hole 6 a so that a space S is provided between the insertedtube 8 and theheader tank 9. Here, the top end is set at a position approximately equal to the inner surface of theheader tank 9. Since the brazing material is stored in the space S provided around thetube 8 inserted to eachinsertion hole 6 a, it can be effectively prevented the brazing material from flowing into thetube 8. Further, as shown in FIG. 27B, the insertion holes 6 a can be formed by pressing in theheader tank 9. In this case, a chamfer is provided around eachinsertion hole 6 a, thereby forming the space S on inner side of theheader tank 9. The chamfers may be provided by cutting. Even in this case, the same effect as that in FIG. 27 can be obtained. - A fourteenth embodiment of the present invention will be now described with reference to FIGS.30-32. In the fourteenth embodiment, the
tubes 8 are arranged relative to therefrigerant container 2 and theheader tank 9 while being divided to upstream side tubes and downstream side tubes in a flow direction of cooling air. As shown in FIG. 30, even when thecooling device 1 is used in the side posture, refrigerant circulates as indicated by arrows, thereby improving the heat radiation performance of thecooling device 1. - As shown in FIG. 31, when the
cooling device 1 is used in the bottom posture, the heat radiation performance can be improved. In this case, preferably, theliquid tubes 8D are disposed at the upstream side of cooling air, and thegas tubes 8C are disposed at the downstream side thereof, thereby further facilitating the refrigerant circulation. Since thegas tubes 8C are disposed at the downstream side of cooling air, thegas tubes 8C can be maintained at a temperature higher than theliquid tubes 8D. Therefore, gas refrigerant flowing in thegas tubes 8C can be prevented from being condensed therein, thereby maintaining the refrigerant circulation. Further, as shown in FIG. 32, theheader tank 9 may be divided to two portions. That is, theheat radiation core 3 can be divided into plural parts in the flow direction of cooling air. - A fifteenth embodiment of the present invention will be now described with reference to FIGS. 33A, 33B and34-37. In the fifteenth embodiment, as shown in FIGS. 33A and 33B, the insertion lengths of the
tubes 8 inserted into therefrigerant container 2 and theheader tank 9 are regulated byinsertion holes radiation plate 6B) and theheader tank 9, respectively. Specifically, each of the insertion holes 2 a, 9 a is provided in a step shape, and eachtube 8 is attached to therefrigerant container 2 and theheader tank 9 through the insertion holes 2 a. 9 a. Eachtube 8 have plural through holes 34 a (e.g., circular through holes or rectangular through hoes) extending in the tube longitudinal direction, and both ends of thetube 8 are formed in the shape shown in FIG. 34. As shown in FIGS. 33A, 33B, 34-36, aside surface 8 b of thetube 8 is fitted to aninner surface 2 b of theinsertion hole 2 a, and the top end of thetube 8 contacts astep surface 2 c of theinsertion hole 2 a. Thus, the insertion length of thetube 2 inserted into therefrigerant container 2 is restricted. The insertion length of thetube 8 inserted into theheader tank 9 is also restricted in the same manner. - Accordingly, the insertion lengths of the
tube 8 inserted into therefrigerant container 2 and theheader tank 9 can be controlled using the insertion holes 2 a, 9 a provided in therefrigerant tank 2 and theheader tank 9 while nonotch 8 a shown in FIG. 19 is provided in thetube 8 at an end inserted into the insertion holes 2 a, 9 a. Since the insertion length can be regulated, the dimensions of therefrigerant container 2 and theheader tank 9 can be reduced in the insertion direction of thetube 8 without closing the through holes 34 a of eachtube 8 as shown in FIG. 37. In this embodiment, a dimension of eachflat tube 8 in the tube thickness direction (up-down direction in FIG. 37) is set approximately equal to a dimension of eachinsertion hole flat tube 8 and the dimension of thehole 2 a in the up-down direction of FIG. 37 is approximately 1.7 mm. Further, the dimension between the step surface in the up-down direction in FIG. 36 is set at 1.5 mm, for example, and each diameter of the through holes 34 a is set at 1.1 mm, for example. Accordingly, even when thetube 8 is inserted into theinsertion hole step surface tube 8 can be enlarged, thereby improving the cooling performance (heat radiation performance). That is, as shown in FIG. 33A, since the step surfaces 2 c, 9 c of the insertion holes 2 a, 9 a are provided so as not to close a through hole 34 a of thetube 8, respectively. Furthermore, thecooling device 1 can be temporarily assembled only by inserting the ends of thetubes 8 into the insertion holes 2 a, 9 a of therefrigerant container 2 and theheader tank 9 without a complex (expensive) jig. Therefore, thecooling device 1 temporarily assembled can be readily integrally brazed, without using complex (expensive) brazing jig. - In the above-described fifteenth embodiment, the
insertion hole plate 6B or may be provided in theintermediate plate 6C. Alternatively, a step portion for regulating an insertion length of eachtube 8 can be provided in thetubes 8 similarly to the above-described seventh embodiment (FIG. 19), while the refrigerant passage in eachtube 8 is not closed. Even in this case, the insertion length of thetubes 8 inserted into therefrigerant container 2 or inserted into theheader tank 9 can be suitably regulated. - Although the present invention has been fully described in connection with the preferred embodiments thereof with reference to the accompanying drawings, it is to be noted that various changes and modifications will become apparent to those skilled in the art.
- For example, in the above-described embodiments, as shown in FIG. 38,
plate fins 14 may be used as theheat radiation fins 10 described in the above embodiments. - Further, the plural embodiments described above may be suitably used by combination.
- Such changes and modifications are to be understood as being within the scope of the present invention as defined by the appended claims.
Claims (23)
1. A cooling device for cooling a heat-generating member, comprising:
a refrigerant container constructed by stacking a plurality of plates for defining a space where refrigerant is stored, the plurality of plates including a first plate to which the heat-generating member is attached, a second plate disposed opposite to the first plate and at least a third plate between the first plate and the second plates; and
a heat radiation core including
a plurality of tubes attached to the second plate of the refrigerant container substantially vertically to a surface of the second plate, to communicate with the space of the refrigerant container, and
a header tank constructed by stacking a plurality of plates, through which the tubes communicate with each other,
wherein the refrigerant container and heat radiation core are disposed in such a manner that, refrigerant is boiled by receiving heat from the heat-generating member attached to the first plate of the refrigerant container, and the boiled refrigerant flows into the tubes to radiate heat to outside in the heat radiation core.
2. The cooling device according to claim 1 , wherein:
the plurality of tubes includes first tubes through which refrigerant mainly flows from the refrigerant container into the header tank, and second tubes through which refrigerant mainly flows from the header tank into the refrigerant container;
the refrigerant container has therein a first barrier portion for restricting refrigerant from flowing into the second tubes; and
the header tank has therein a second barrier portion for restricting refrigerant from flowing into the first tubes.
3. The cooling device according to claim 1 , wherein the header tank has a capacity smaller than a capacity of the refrigerant container.
4. The cooling device according to claim 1 wherein each plate constructing the refrigerant container has a surface area larger than that of each plate constructing the header tank.
5. The cooling device according to claim 1 , wherein at least one of the plates constructing the refrigerant container has the same shape as at least one of the plates constructing the header tank.
6. The cooling device according to claim 1 , wherein another heat-generating member is attached to the plate disposed at a most outside of the header tank.
7. The cooling device according to claim 6 , wherein:
the plurality of tubes includes first tubes through which gas refrigerant boiled in the refrigerant container flows from the refrigerant container to the header tank, and second tubes through which gas refrigerant boiled in the header tank flows from the header tank to the refrigerant container;
the refrigerant container has therein a first barrier portion for restricting gas refrigerant from flowing into the second tubes; and
the header tank has therein a second barrier portion for restricting gas refrigerant from flowing into the first tubes.
8. The cooling device according to claim 1 , wherein the tubes are disposed on the second plate of the refrigerant container in zigzag.
9. The cooling device according to claim 1 , wherein:
the plurality of tubes includes first tubes each having an insertion length inserted into the header tank, and second tubes each having an insertion length inserted into the header tank, smaller than that of each first tube; and
each first tube protrudes from an inner surface of the header tank inside the header tank by a predetermined length.
10. The cooling device according to claim 1 , wherein:
the plurality of tubes includes first tubes each having an insertion length inserted into the refrigerant container, and second tubes each having an insertion length inserted into the refrigerant container, larger than that of each first tube; and
each second tube protrudes from an inner surface of the refrigerant container inside the refrigerant container by a predetermined length.
11. The cooling device according to claim 9 , wherein:
each second tube has an insertion length inserted into the refrigerant container, larger than that of each first tube inserted into the refrigerant container; and
each second tube protrudes from an inner surface of the refrigerant container inside the refrigerant container by a predetermined length.
12. The cooling device according to claim 9 , wherein:
the heat-generating member is attached onto the first plate in an attachment area; and
the first tubes are disposed on the second plate within an area corresponding to the attachment area, and the second tubes are disposed on the second plate of the refrigerant container outside the area corresponding to the attachment area.
13. The cooling device according to claim 9 , wherein the insertion length of each second tube inserted into the header tank is set to be substantially equal to a plate thickness of the plate of the header tank, into which each second tube is inserted.
14. The cooling device according to claim 11 , wherein the insertion length of each first tube inserted into the refrigerant container is set to be substantially equal to a plate thickness of the second plate of the refrigerant container.
15. The cooling device according to claim 1 , wherein one of each tube and the header tank includes a first insertion regulating member for regulating the insertion length of the tube inserted into the header tank.
16. The cooling device according to claim 15 , wherein:
the first insertion regulating member is a step portion provided at an end of the tube;
the step portion has a surface substantially perpendicular to an insertion direction of the tube; and
the surface of the step portion contacts the header tank when the tube is connected to the header tank.
17. The cooling device according to claim 15 , wherein:
the first insertion regulating member is a step portion provided in the header tank around an insertion hole of the header tank, into which the tube is inserted to communicate with the header tank;
the step portion has a surface substantially perpendicular to the insertion direction of the tube; and
a top end of the tube contacts the surface of the step portion when the tube is inserted into the insertion hole.
18. The cooling device according to claim 1 , wherein:
the header tank includes:
a first plate defining a plurality of first holes into which the tubes are inserted; and
a second plate with which the first plate is stacked, the second plate defining a plurality of second holes each having an open area smaller than an open area of each first hole; and
the tube is inserted into the first hole to contact the second plate around the second hole to communicate with the second hole.
19. The cooling device according to claim 1 , wherein one of each tube and the refrigerant container includes a second insertion regulating member for regulating the insertion length of the tube inserted into the refrigerant container.
20. The cooling device according to claim 19 , wherein:
the second insertion regulating member is a step portion provided at an end of the tube;
the step portion has a surface substantially perpendicular to an insertion direction of the tube; and
the surface of the step portion contacts the second plate of the refrigerant container when the tube is connected to the header tank.
21. The cooling device according to claim 19 , wherein:
the second insertion regulating member is a step portion provided in the second plate of the refrigerant container around an insertion hole into which the tube is inserted to communicate with the refrigerant container;
the step portion has a surface substantially perpendicular to the insertion direction of the tube; and
a top end of the tube contacts the surface of the step portion when the tube is inserted into the insertion hole.
22. The cooling device according to claim 1 , wherein:
the second plate of the refrigerant container defines a first hole into which the tube is inserted;
one of the third plate stacked on the second plate defines a second hole having an open area smaller than an open area of the first hole of the second plate; and
the tube is inserted into the first hole of the second tube to contact the one of the third plates around the second hole to communicate with the second hole of the one of the third plates.
23. The cooling device according to claim 1 , wherein:
the heat radiation core is disposed to perform heat exchange between the refrigerant flowing through the tubes and air passing through the heat radiation core outside the tubes; and
the heat radiation core is disposed to be divided into at least two core parts in a flow direction of air passing through the heat radiation core.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US10/800,097 US7017657B2 (en) | 2001-05-11 | 2004-03-12 | Cooling device boiling and condensing refrigerant |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
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JP2001-141014 | 2001-05-11 | ||
JP2001141014 | 2001-05-11 | ||
JP2001227260A JP2003042671A (en) | 2001-07-27 | 2001-07-27 | Ebullient cooling device |
JP2001-227260 | 2001-07-27 | ||
JP2002-112563 | 2002-04-15 | ||
JP2002112563A JP4055458B2 (en) | 2001-05-11 | 2002-04-15 | Boiling cooler |
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US10/800,097 Division US7017657B2 (en) | 2001-05-11 | 2004-03-12 | Cooling device boiling and condensing refrigerant |
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US20020166655A1 true US20020166655A1 (en) | 2002-11-14 |
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US10/800,097 Expired - Lifetime US7017657B2 (en) | 2001-05-11 | 2004-03-12 | Cooling device boiling and condensing refrigerant |
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US10/800,097 Expired - Lifetime US7017657B2 (en) | 2001-05-11 | 2004-03-12 | Cooling device boiling and condensing refrigerant |
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2002
- 2002-04-26 TW TW091108748A patent/TW556328B/en not_active IP Right Cessation
- 2002-05-01 US US10/136,086 patent/US20020166655A1/en not_active Abandoned
- 2002-05-13 CN CNB021193428A patent/CN1257548C/en not_active Expired - Fee Related
-
2004
- 2004-03-12 US US10/800,097 patent/US7017657B2/en not_active Expired - Lifetime
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US20070246193A1 (en) * | 2006-04-20 | 2007-10-25 | Bhatti Mohinder S | Orientation insensitive thermosiphon of v-configuration |
US20080041565A1 (en) * | 2006-08-16 | 2008-02-21 | Hon Hai Precision Industry Co., Ltd. | Integrated cooling system with multiple condensing passages for cooling electronic components |
US7661465B2 (en) * | 2006-08-16 | 2010-02-16 | Hon Hai Precision Industry Co., Ltd. | Integrated cooling system with multiple condensing passages for cooling electronic components |
US8705009B2 (en) | 2009-09-28 | 2014-04-22 | Asml Netherlands B.V. | Heat pipe, lithographic apparatus and device manufacturing method |
US20110075118A1 (en) * | 2009-09-28 | 2011-03-31 | Asml Netherlands B.V. | Heat pipe, lithographic apparatus and device manufacturing method |
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US20130146255A1 (en) * | 2011-12-09 | 2013-06-13 | Hyundai Motor Company | Heat exchanger for vehicle |
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US20190264986A1 (en) * | 2018-02-27 | 2019-08-29 | Auras Technology Co., Ltd. | Heat dissipation device |
US20220290926A1 (en) * | 2019-12-02 | 2022-09-15 | Huawei Technologies Co., Ltd. | Apparatus for transferring heat from a heat source to air |
Also Published As
Publication number | Publication date |
---|---|
US20040173342A1 (en) | 2004-09-09 |
US7017657B2 (en) | 2006-03-28 |
TW556328B (en) | 2003-10-01 |
CN1385901A (en) | 2002-12-18 |
CN1257548C (en) | 2006-05-24 |
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