US20020056542A1 - Flat type heat pipe - Google Patents
Flat type heat pipe Download PDFInfo
- Publication number
- US20020056542A1 US20020056542A1 US09/998,678 US99867801A US2002056542A1 US 20020056542 A1 US20020056542 A1 US 20020056542A1 US 99867801 A US99867801 A US 99867801A US 2002056542 A1 US2002056542 A1 US 2002056542A1
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- United States
- Prior art keywords
- heat pipe
- flat type
- type heat
- aluminum plates
- aluminum
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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.)
- Abandoned
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Classifications
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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
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/46—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids
- H01L23/473—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids by flowing liquids
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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
-
- 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
- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/13—Discrete devices, e.g. 3 terminal devices
- H01L2924/1304—Transistor
- H01L2924/1305—Bipolar Junction Transistor [BJT]
- H01L2924/13055—Insulated gate bipolar transistor [IGBT]
Abstract
A flat type heat pipe for mounting a heating power element, which is capable of forming an optionally shaped heat transferring path with high accuracy, which is of a thin type and to which fins are easily attached. The flat type heat pipe includes at least two aluminum plates substantially in parallel with each other and brazed to each other so as to form a heat transferring path therebetween. The flat type heat pipe also includes an operating liquid which fills the heat transferring path. Because the heat transferring path 25 is formed by means of press molding, punching, laser beam machining, or cutting various shapes of heat transferring paths can be formed finely and with high accuracy. The flexible flat type heat pipe can be made thin, which allows for a variety of uses. Grooves and wicks can be disposed in the heat transferring path, thereby improving the heat conductivity. Because the surface is flat, the fins can be easily attached thereto, thereby a satisfactory radiation effect can be obtained.
Description
- The present invention relates to a flat type heat pipe which is small-sized, easy to produce, superior in heat conductivity, and adapted to cool heat generating electronic components such as Insulated Gate Bipolar Transistor (IGBT), Intelligent Power Module (IPM), power elements (transistor) of thyristors, or rectifying devices.
- It is known to use roll bond panels as effective cooling means of electronic components relating to power electronics which are used for electronic equipment and power electric equipment.
- The above-mentioned roll bond panels, as shown in FIGS. 23a and 23 b, are produced by thermo-pressure-bonding and includes two
aluminum plates heat transferring path 25 wherein a portion of the release agent is inflated by air pressure. The roll bond panel is shaped in such a manner that a portion of theheat transferring path 25 protrudes, so that a surface of the roll bond panel is made concavoconvex. - The roll bond panel has the following problems:
- (1) Because it is formed by inflating the portion of the
heat transferring path 25 by air pressure, the dimensional accuracy of theheat transferring path 25 cannot be improved. Also, it is difficult to make theheat transferring path 25 thinner. - (2) Because the
aluminum plates - (3) Because the surfaces of the
aluminum plates - It is therefore an object of the present invention to provide a flat type heat pipe, which has an optionally contoured heat transferring path with high accuracy, which is thin, which provides grooves and wicks, and which structure facilitates the attachment of the fins.
- A first embodiment of the present invention provides a flat type heat pipe characterized in that at least two aluminum plates arranged substantially in parallel with each other are brazed to each other so as to form a heat transferring path therebetween, and an operating liquid is filled in the heat transferring path.
- A second embodiment of the present invention provides a flat type heat pipe wherein an aluminum plate which is worked in a corrugated manner is interposed between two aluminum plates.
- A third embodiment of the present invention provides a flat type heat pipe wherein the aluminum plate which is worked in the corrugated manner is an aluminum brazing sheet.
- A fourth embodiment of the present invention provides a flat type heat pipe wherein penetrating holes are disposed on side walls of the aluminum plate which is worked in the corrugated manner.
- A fifth embodiment of the present invention provides a flat type heat pipe wherein a metal tube is brazed onto an open end of the heat transferring path and a predetermined portion of aid metal tube is sealed by pressure bonding and/or welding.
- A sixth embodiment of the present invention provides a flat type heat pipe wherein supporting bodies are arranged between the at least two aluminum plates which are substantially in parallel with each other, in such a manner that the aluminum plates are spaced at a predetermined distance.
- A seventh embodiment of the present invention provides a flat type heat pipe wherein a predetermined number of protruding portions are formed on one aluminum plate of the at least two aluminum plates arranged substantially in parallel with each other and leading portions of the protruding portions are joined to the other aluminum plates.
- An eighth embodiment of the present invention provides a flat type heat pipe wherein grooves are formed on inner surfaces of the heat transferring path, and/or a wick is arranged on the heat transferring path.
- A ninth embodiment of the present invention provides a flat type heat pipe wherein the wick comprises grooves forms on an inner surface of the aluminum plate, or an uneven portion formed by melting a brazing filler material forms the inner surface of the aluminum plate, whereby the brazing filler material is solidified and forms the inner surface of the aluminum plate.
- A tenth embodiment of the present invention provides a flat type heat pipe wherein the wick comprises a wave-like plate brazed onto the aluminum plate, a cylindrical wire netting, a plate-like wire netting, or a number of spheres adjacent to each other.
- An eleventh embodiment of the present invention provides a flat type heat pipe wherein protruding portions are formed on one aluminum plate of the at least two aluminum plates arranged substantially in parallel with each other, hole portions are disposed on the other aluminum of the same, and the aluminum plates are positioned by inserting the protruding portions into the hole portions.
- A twelfth embodiment of the present invention provides a flat type heat pipe wherein fins are brazed onto a part or the whole of the surface of the aluminum plate.
- Further objects and advantages of the invention will be apparent from the following description of the preferred embodiments of the invention as illustrated in the accompanying drawings.
- FIG. 1 is an exploded view showing a flat type heat pipe according to a first embodiment of the present invention.
- FIG. 2a is a transverse sectional view of a flat type heat pipe according to a second embodiment of the present invention, and FIG. 2b is a perspective view of a corrugated brazing sheet used in the above flat type heat pipe shown in FIG. 2a.
- FIG. 3 is a sectional view of a flat type heat pipe according to a third embodiment of the present invention.
- FIG. 4a is plan view of a flat type heat pipe according to a fourth embodiment of the present invention, FIG. 4b is a transverse sectional view of FIG. 4a, and FIG. 4c is a perspective view of a brazing sheet for forming a path used in the flat type heat pipe.
- FIG. 5a is a plan view of a flat type heat pipe according to a fifth embodiment of the present invention, FIG. 5b is a sectional view taken along line A-A of FIG. 5a, FIG. 5c through 5 f are perspective views of a supporting body used in the flat type heat pipe, wherein the supporting body takes the shape of a column, a barrel, a tabor and a sphere, respectively.
- FIG. 6a is an exploded view showing a flat type heat pipe according to a sixth embodiment of the present invention, and FIG. 6b is a sectional view taken along line B-B of FIG. 6a.
- FIG. 7a is a perspective view of a flat type heat pipe according to a seventh embodiment of the present invention, and FIG. 7b is a transverse sectional view of FIG. 7a.
- FIG. 8 is an exploded view showing an example of a method of producing a flat type heat pipe according to the present invention.
- FIG. 9 is an exploded view showing an example of another method of producing the flat type heat pipe according to the present invention.
- FIG. 10 is a plan view showing an embodiment in which fins are arranged on the flat type heat pipe according to the present invention.
- FIG. 11 is a plan view showing a flat type heat pipe according to an eighth embodiment of the present invention.
- FIG. 12a is a plan view showing an example of a portion through which operating liquid fills on the flat type heat pipe according to the present invention, FIG. 12b is a side view of FIG. 12a, and FIG. 12c is a front view of FIG. 12a.
- FIG. 13a is a plan view showing an example of a method of producing the flat type heat pipe according to the present invention, and FIG. 13b is a plan view showing another example of the method of producing the flat type heat pipe of the present invention.
- FIGS. 14, 14a, 14 c and 14 d illustrate an example of a method of pouring an operating liquid into the flat type heat pipe of the present invention, then sealing the flat type heat pipe.
- FIG. 15 is a perspective view of a flat type heat pipe according to a ninth embodiment of the present invention;
- FIGS. 16a and 16 b are perspective views of flat type heat pipes according to the tenth and eleventh embodiments of the present invention, respectively.
- FIGS. 17a through 17 d are sectional views of the flat type heat pipes according to the twelfth, thirteenth, fourteenth, and fifteenth embodiments of the present invention, respectively.
- FIG. 18 shows an exploded view of the process of producing the flat type heat pipe of the thirteenth embodiment of the present invention.
- FIG. 19 is a plan view showing a flat type heat pipe according to the sixteenth and seventeenth embodiments of the present invention.
- FIG. 20 is a sectional view showing the flat type heat pipe according to the sixteenth embodiment of the present invention.
- FIG. 21 is a sectional view showing the flat type heat pipe according to the seventeenth embodiment of the present invention.
- FIG. 22 is a perspective view showing the flat type heat pipe according to the sixteenth and seventeenth embodiments of the present invention.
- FIG. 23a is a perspective view of a flat type heat pipe found in the prior art, and FIG. 23b is a sectional view taken along line C-C of FIG. 23a.
- A flat type heat pipe according to the present invention has characteristics of two aluminum plates arranged substantially in parallel with each other and being brazed to each other so as to form a heat transferring path therebetween, and an operating liquid being filled in the heat transferring path.
- According to the present invention, there is used, as an aluminum plate, an aluminum plate material having a thickness of for example, 0.2 mm to 5 mm and which exhibits a high thermal conductivity (i.e., the level of JIS-A-1000 where JIS stands for Japanese Industrial Standard) or a brazing plate. Generally, the aluminum plate is used for the outer members, and the brazing plate is used for the inner member.
- There can be used, as a brazing plate, a both side-bonding type plate comprised of a core material whose both surfaces are attached to the aluminum plates by brazing using brazing filler metals at both side thereof having a thickness of for example, 0.5 mm to 10 mm. Some examples are, JIS-BA12PC comprising core material 303, brazing filler metal BA4343 [Al-6 to 8 wt % Si alloy] JIS-BA22PC comprising core material 6951, brazing filler metal BA4343, and JIS-BA24PC comprising core material 6951, brazing filler metal BA4045 [Al-9 to 11 wt % Si alloy]. Also, one side-bonding type plate can be employed as the brazing sheet. If two or more brazing sheets are employed, the bonding strength can be raised if need be. The brazing for bonding is executed at about 600° C.
- As for the operating liquid, an ordinal heating medium such as a kind of alcohol, pollution free freon, ice-free liquid, “FLORINATO” (Sumitomo 3M Co.-made fluoro-inert liquid) can be employed.
- Even if the flat type heat pipe is arranged horizontally so long as grooves are formed on a wall surface of the portion of the heat transferring path, or wicks are arranged in the heat transferring path, the operating liquid can be made up promptly, thereby improving the heat transfer characteristics. As for the wicks, ordinary articles such as meshes, felts, nonwoven fabrics can be employed.
- Because the flat type heat pipe of the present invention is flat at surfaces thereof, fins can be easily attached thereto. If the fins are attached thereto by brazing, the thermal transferring characteristics between the flat type heat pipe main body and the fins are improved, thereby further improving the radiation effect of the fins.
- The molding of a dish-like portion of the aluminum plate and the molding of the brazing sheet are performed by press-molding. If the thickness of the work material is relatively thick, about 1 mm or more, the perforating work on the brazing sheet is performed by press-punching, cutting work, a water jetting cutter or a laser beam working machine, and if the work material is thin, the perforating work on the brazing sheet is performed by an original mechanical cutter or a laser beam working machine.
- In the heat transferring path of the present invention flat type heat pipe, the operating liquid is circulated sufficiently to realize a high thermal conductivity if the sectional dimension is preferably set to not less than 0.5 mm×0.5 mm, or not less than the corresponding sectional area preferably.
- In the present invention, at least two aluminum plates are joined by the brazing, thereby forming the heat transferring path. If a brazing sheet is used for any one of the aluminum plates, the brazing can be performed easily. The heating for the brazing is performed while sandwiching the brazing sheet between the aluminum plates and adding pressure to such a degree that respective things are not deviated. The heating temperature is chosen according to the types of brazing sheets employed. Generally, the brazing is carried out at a temperature of about 600° C. The heating is carried out by using a heating furnace. In this instance, it is efficient to carry out the brazing of the fins simultaneously with the brazing of the aluminum plates.
- In the present invention, an open portion is disposed at least one location of the heat transferring path, such that the operating liquid can be poured through the open portion. If a metal tube made of aluminum or aluminum alloy, is attached to the open portion such that it forms an air tight seal, the operating liquid can be easily poured thereinto and easily sealed after the pouring. Though the sealing is facilitated by pressure bonding or welding, brazing can be also employed. It is preferred that welding is carried out together with the pressure bonding such that sealing is surely accomplished. The kind of operating liquid that is used is suitably changed according to the temperature at which the heat pipe is used.
- In the present invention, if grooves are formed on inner surfaces of the heat transferring path, or wicks are arranged in the heat transferring path, the operating liquid can be circulated quickly. According to the present invention, the above-mentioned grooves can be easily formed at the time of rolling or press-molding of the aluminum plate, and the formed grooves cannot be eliminated at subsequent processes. Furthermore, variously shaped wicks can be easily arranged therein.
- The present invention provides for the positioning of both of the aluminum plates by inserting the protruding portions on one of the aluminum plates into the hole portions on the other of the aluminum plates such that the dimensional accuracy of the formed flat type heat pipe is improved.
- FIG. 1 is an exploded view showing a flat type heat pipe according to a first embodiment of the present invention. A number of slotted
holes 13 are formed on abrazing sheet 10 having both surfaces brazed to bothaluminum plates bridge 14 formed on a right surface and a rear surface of thebridge 14.Aluminum plates brazing sheet 10, respectively, and then they are heated to a predetermined temperature, thereby brazing thealuminum plates brazing sheet 10 together as one body. - This
brazing sheet 10 can be formed by formingrecesses 15 first, then working the slottedholes 13 by punching. Alternatively, the slottedholes 13 and therecesses 15 of thebridge 14 can also be formed by one pressing step. - The characteristics of the flat type heat pipe are described below:
- (1) Because the upper and lower aluminum plates are brazed perfectly by the brazing sheet of the both side-bonding type, the aluminum plates can bear high internal pressure.
- (2) Because each of the recesses is formed in a widthwise direction of the bridge, the operating liquid is continuously flowed in the plane direction through the slotted
holes 13 and therecesses 15. - (3) Because each of the recesses is formed in a widthwise direction of the bridge, there is no need to superpose a number of aluminum plates, three aluminum plates suffice.
- FIG. 2a is a transverse sectional view of a flat type heat pipe according to a second embodiment of the present invention. In this flat type heat pipe,
aluminum plates brazing sheet 10 which are corrugated in a trapezoidal sectional shape. Punchedwork 30 are brazed to both side end portions of thealuminum plates brazing sheet 10 are interposed between the punchedwork 30 and thealuminum plates - FIG. 2b is a perspective view of the
above brazing sheet 10. A number ofwindows 16 are disposed on side surfaces of trapezoidal portions of thebrazing sheet 10. In the flat type heat pipe to which thebrazing sheet 10 shown in FIG. 2b is applied,heat transferring paths 25 each are continued in the plane direction. - The
brazing sheet 10 is formed by arrangingwindows 16 on thebrazing sheet 10, then working thebrazing sheet 10 in a corrugated sectional shape. - FIG. 3 is a sectional view of a flat type heat pipe according to a third embodiment of the present invention. In this flat type heat pipe, the punched
work 30 is directly brazed to thealuminum plates corrugated brazing sheet 10 between the punchedwork 30 and thealuminum plates brazing sheet 10 is directly brazed to thealuminum plates work 30. - FIG. 4a is a plan view of a flat type heat pipe according to a fourth embodiment of the present invention, and FIG. 4b is a transverse sectional view of FIG. 4a.
- In this flat type heat pipe, the
aluminum plates brazing sheet 10 which is corrugated in a rectangular sectional shape at predetermined portions thereof. - In FIG. 4a,
reference numeral 40 designates an aluminum tube for pouring the operating liquid into the heat transferring path. - FIG. 4c is a perspective view of the
brazing sheet 10. A plurality of rectangular sectional shaped members are positioned at regular intervals to formrow 41. Both ends of eachprotrusion portion 42 which constitute therow 41 are left open. Accordingly, in the flat type heat pipe, theheat transferring path 25 are formed continuously in the plane direction. - The
brazing sheet 10 is formed by notching thebrazing sheet 10 atend portions 43 of theprotrusion portion 42 and then causing the protrudingportions 42 to protrude. - FIG. 5a is a plan view of a flat type heat pipe according to a fifth embodiment of the present invention, and FIG. 5b is a sectional view taken along line A-A of FIG. 5a.
- The flat type heat pipe comprises an
aluminum plate 22 formed in a dish-like manner and thealuminum plate 20 which is flat, bothaluminum plates space 25 which is a heat transferring path at a center portion thereof. The supportingbody 50 is brazed to the desired portion of theplates body 50 is provided according to the situation. - FIGS. 5c, 5 d, 5 e and 5 f are perspective views of embodiments of the supporting
body 50. FIG. 5c is a cylindrical supporting body. FIG. 5d is a barrel-like supporting body. FIG. 5e is a drum-like supporting body. FIG. 5f is a spherical supporting body. - FIG. 6a is an exploded view showing a flat type heat pipe according to a sixth embodiment of the present invention. The
brazing sheet 10 is punched in an L-shape at a center portion thereof and is arranged on thealuminum plate 20. Aninner frame 60 made of a brazing sheet is brazed to the desired portion inside the punched portion so as to bear the inner pressure when used. - FIG. 6b is a sectional view taken along line B-B of FIG. 6a. The
hole 61 defined by the center portion of theinner frame 60 is fitted into a burring-workedhole portion 23 disposed on thealuminum plate 20, thereby positioning theinner frame 60. Theinner frame 60 may be positioned by inserting theinner frame 60 into a recess disposed on an inner surface ofaluminum plate 20. - The flat type heat pipe is formed by arranging the
aluminum plate 22 on thebrazing sheet 10 and theinner frame 60 and then heating them to a brazing temperature. - The upper surface of the burring-worked
hole portion 23 and an inner surface of thealuminum plate 22 are brazed to produce an air-tight connection using a wire-like brazing material. - The heat transferring path is formed between the
brazing sheet 10 and theinner frame 60 of the brazing sheet. This heat transferring path is formed continuously in the plane direction. In FIG. 6a,reference numeral 40 designates an aluminum tube for pouring the operating liquid into the heat transferring path. - FIG. 7a is a perspective view of a flat type heat pipe according to a seventh embodiment of the present invention, and FIG. 7b is a sectional view of FIG. 7a.
- In this flat type heat pipe, a number of truncated conical protruding
portions 90 are formed at regular distances along onealuminum plate 23 of the two aluminum plates arranged substantially in parallel with each other. Leading ends of the truncated conical protrudingportions 90 are brazed to theother aluminum plate 21 thereof. Thealuminum plate 21 is a brazing plate having a brazing material at one surface side thereof, and arranged with the brazing material side faced upward. Acircumferential portion 91 and leading portions 92 of the protrusion portions of thealuminum plate 23 are brazed to thealuminum plate 21. - This flat type heat pipe is superior in its ability to withstand inner pressure strength. This embodiment differs from the embodiment of FIG. 5, because the supporting
body 50 of FIG. 5 is not used. Both thealuminum plates aluminum plate 23 on a side in which the protrusion portions are formed is also a substantially flat shape, so that the high heat conductive efficiency can be obtained no matter how the heating generating element is connected to thealuminum plates - The contour and the number of the protrusion portions can be selected according to the use. If a number of protrusion portions of small diameter are formed, the strength of the
aluminum plate 23 is improved, and the thermal conductivity is equalized. The contour of the protrusion portion can be an elliptic cylinder-like column, a square pillar, an elliptical cone-like cone, a sexangle cone-like structure or a rectangular cone-like structure. - There is shown in FIG. 8 an example of a seventh embodiment of a method of producing a flat type heat pipe according to the present invention. As shown in FIG. 8a, one
aluminum plate 23 of the two aluminum plates is press-molded in a dish-like contour, next desired portions of the protruded dish-like portion is depressed to form cones in the opposite side which results in truncatedconical protrusion portions 90 being formed. Furthermore, thealuminum plate 23 is mounted on theother aluminum plate 21 with the truncatedconical protrusion portions 90 faced downward as shown in FIG. 8c, and then heated in a furnace at a predetermined temperature, thereby both thealuminum plates aluminum plate 23 at the dish portion and the height of the protrudingportion 90 are made the same. Theother aluminum plate 21 is employed with a brazing plate having a brazing material at one side surface thereof, and is arranged with the brazing material side upward. - Press-molding of the dish-like portion may be executed simultaneously with that of the protruding portions.
- FIG. 9 illustrates a method of executing the simultaneous brazing of the flat type heat pipe of the present invention and the radiating fins.
- The
aluminum plate 21 with a brazing plate having a brazing material at one side surface thereof is arranged at the lowest location with the brazing material side upward. The dish-like aluminum plate 23 having protruding portions is arranged on thealuminum plate 21 with the protruding portions faced downward, on which thebrazing sheet 10 having the brazing materials at both side surfaces is arranged. Furthermore, four block-like fins 70 are arranged on the blazingsheet 10. This assembly is heated in a brazing furnace. In this situation, if flux is previously coated on the brazing materials of thebrazing plates - As shown in FIG. 10, if the
right fins 70 and theleft fins 70 which are positioned adjacent to each other are arranged in such a manner that the right peak portions and the left peak portions are shifted alternately, the thermal conductivity is improved. - If the flat type heat pipe with the fins is merely placed on MCM (Multi-chip module), the MCM can be satisfactorily cooled. In a case where the flat type heat pipe is placed on the MCM, the flat type heat pipe is arranged with the fins faced upward.
- FIG. 11 is a plan view showing a flat type heat pipe according to an eighth embodiment of the present invention.
- In this flat type heat pipe, the
fins 70 are brazed to one side surface of the flat type heat pipe main body shown in FIG. 1 by thebrazing sheet 11, whereas the heat generatingelectronic component 71 is brazed to the other side surface of the flat type heat pipe. In FIG. 11,reference numeral 40 designates an aluminum tube for pouring the operating liquid into the heat transferring path. - It is efficient to braze the fins together with the flat type heat pipe when forming the flat type heat pipe by the brazing. Because the flat type heat pipe main body and the fins are metallically joined to each other due to the brazing of the fins, the thermal conductivity between both is improved compared with a thermal conductive resin coating method in the prior art. This results in an improvement of the radiation effect of the fins.
- FIG. 12a shows a plan view of an example of an operating liquid filling portion on the flat type heat pipe according to the present invention. FIG. 12b a side view of FIG. 12a and FIG. 12c is a front view of FIG. 12a.
- An
aluminum tube 40 is inserted into an open portion of the heat transferring path of the flat type heat pipe and thealuminum tube 40 is air-tightly brazed to the circumferential surface of the open portion using abrazing filler material 46. Thealuminum tube 40 is friction-fitted at a predetermined portion of the open portion and sealed at a leading portion of the open portion by the welding. - FIG. 13 through FIG. 15 show examples of a method of producing the flat type heat pipe according to the present invention. The flat type heat pipe is formed by using the two
aluminum plates - The
aluminum plate 23 in FIG. 13a is a dish-like molded plate having truncated conical protrudingportions 90, and thealuminum plate 21 in FIG. 13b is a brazing plate having a brazing filler material at one side thereof. - FIGS. 14a, 14 b, 14 c and 14 d show a method of pouring and sealing the operating liquid.
- An
open end 94 is protrudingly disposed as shown in FIG. 14a. The operating liquid is poured through the protrudingopen end 94, then an intermediate portion of the protrudingopen end 94 is caulked from above and below as shown in FIG. 14b. Further the lead end is welded to create a sealed, as shown in FIG. 14c. TIG welding, plasma welding, and laser beam welding are suitable welding methods. As shown in FIG. 14d, the lead end of the protrudingopen end 94 is positioned slightly inside the outer circumference of the heat pipe. In this manner, the fear that the protrudingopen end 94 may be damaged due to the outer forces after sealed is reduced thus, the reliability is improved. - In the flat type heat pipe, because both sides of the protruding
open end 94 are free, the aluminum is forced out freely and laterally when the friction-fitting is carried out vertically, thereby putting the friction-fitting into practice with certainty. - FIG. 15 is a perspective view of a flat type heat pipe with fins, which is produced by the above-mentioned method, according to a ninth embodiment of the present invention. The flat type heat pipe which is produced is located upright as shown in FIG. 15 and a predetermined portion thereof is heated by a
heater 93 and the heat resistance is measured. The heat resistance of the flat type heat pipe with fins is two-thirds of that of the aluminum casing brazed with the radiating fins having the same dimension/counter as the flat type heat pipe. - Next, an example of the constituent groove and the wick will be described below. FIG. 16 illustrates examples of the constituent groove, and FIG. 17 illustrates examples of the wick arrangement.
- FIGS. 16a and 16 b show a flat type heat pipes according to the tenth and eleventh embodiments of the present invention, respectively. These embodiments comprise the flat type heat pipe having grooves.
- In the flat type heat pipe shown in FIG. 16a,
grooves 51 are formed on an inner surfaces of the twoaluminum plates grooves 51 can be formed by an etching method or a mold pressing method. The operating liquid can flow freely along thesegrooves 51. Thealuminum plates filler materials 46. - In the flat type heat pipe shown in FIG. 16b, inner surfaces of the two
aluminum plates brazing filler material 46. Initially, the surfaces of thebrazing filler material 46 is molten and then they solidified; thus, the surfaces are made rough in an uneven manner. Thisuneven portion 52 formed on the above-mentioned surface constitutes grooves. Thisuneven portion 52 is formed when the brazing is executed on the twoaluminum plates uneven portion 52 depends on the thickness of the brazing filler material and the brazing temperature. The thicker the brazing filler material and the higher the brazing temperature, the deeper the uneven portion. - FIGS. 17a shows a flat type heat pipe according to a twelfth embodiment of the present invention. In this embodiment, a wave-
like plate 53 is arranged as the wick between the twoaluminum plates like plate 53 is brazed to the twoaluminum plates vicinity 54 of a joined portion of thealuminum plates like plate 53 constitute cooling medium passages. - FIG. 17b shows a flat type heat pipe according to a thirteenth embodiment of the present invention. In this embodiment, a plurality of plate-like metal nets 55 are arranged as the wick between the two
aluminum plates - FIG. 17c shows a flat type heat pipe according to a fourteenth embodiment of the present invention. In this embodiment, cylindrical metal nets 56 are arranged as the wick between the two
aluminum plates - FIG. 17d shows a flat type heat pipe according to a fifteenth embodiment of the present invention. In this embodiment, a number of
spheres 57 are arranged between the twoaluminum plates - FIG. 18 shows a method of producing the flat type heat pipe shown in FIG. 17b, which is provided with fins. A blank plate of the brazing plate is pressed into a predetermined contour and then placed on a plate-
like wire netting 55. Furthermorefins 70 are placed on the pressed blazingplate 10. This assembly is passed through the brazing furnace to be made into a brazed article. Then the operating liquid is entered into the flat type heat pipe thus, the vacuum lock is carried out. - The heat resistance of the flat type heat pipe having grooves or wicks inside and fins attached to the outside and produced by the method of the present invention was measured similarly to that of FIG. 15. According to the measurement, the heat resistance is reduced by 10 to 20% compared to the flat type heat pipe without grooves and wicks.
- FIGS. 19 through 22 show flat type heat pipes according to the sixteenth and seventeenth embodiments of the present invention. These embodiments each comprise two aluminum plates. Protrusion portions are disposed on one of the aluminum plates, and holes are disposed on the other of the aluminum plates, thereby the aluminum plates are joined by inserting the protrusion portions into the holes.
- FIG. 19 is a plan view of the flat type heat pipe having the protrusion portions and the holes. The flat type heat pipe is L-shaped and two positioning
portions 101 are provided. - FIG. 20 shows a sectional view of one example of the positioning portions. The flat type heat pipe is comprised of two
aluminum plates portions 104 are disposed on thelower aluminum plate 102, andhole portions 105 are defined by theupper aluminum plate 103. The upper andlower aluminum plates portions 104 into thehole portions 105. If the clearance between the protrudingportion 104 and thehole portion 105 is small, the dimensional accuracy can be improved. - FIG. 21 shows a sectional view of another example of the positioning portion. In this example, protruding
portions 112 of thelower aluminum plates 110 are tapered and holes 113 of theupper aluminum plates 111 are relatively small. The protrudingportion 112 is adapted to fit into thehole 113, which results in an improvement of the positioning accuracy. - FIG. 22 shows a perspective view of the example of the positioning portion. In this example, the outer dimension of the
upper aluminum plate 121 is smaller by about 0.1 mm to 0.5 mm compared with that of thelower aluminum plate 122. The positioning is carried out by thepositioning portion 123. Therefore, even if there is a slight deviation in the positioning, the dimensional accuracy of the flat type heat pipe is improved without deviating from the outside dimension of thelower aluminum plate 122. So, even in a case where the flat type heat pipe is automatically mounted onto the power element, by means of screws in the robot, the dimensional accuracy is improved. Thus, the position of the female screw is hard to be deviated. - Moreover, the positioning by the protruding portion and the hole portion may be carried out at one location or a plurality of locations as need be. Furthermore, the protruding portion and the hole portion may be disposed on the upper aluminum plate, and the corresponding hole portions and protruding portions may be disposed on the lower aluminum plate.
- In a case where the flat type heat pipe is formed by using three or more of aluminum plates and brazing sheets, (e.g., the protruding portions are disposed on one aluminum plate, and the hole portions are formed on two of the other aluminum plates) three or more of the aluminum plates and the brazing plates can be positioned by penetrating the protruding portions through the hole portions. Also, the corresponding protruding portions and hole portions may be disposed on the aluminum plate or brazing plate adjacent to one another, respectively.
- As described above, because the flat type heat pipe of the present invention is formed by methods such as press-molding, punching, laser beam working and cutting variously shaped heat transferring path can be formed minutely and with high accuracy. Furthermore, the thin and flexible flat type heat pipe can be obtained and the range of uses can be increased. Because the grooves and the wicks can be disposed in the heat transferring path, the thermal conductivity can be improved. Furthermore, because the surface of the pipe is flat, the fins can be easily provided within the heat transferring path and satisfactory radiation effect can be obtained. The hole portions and the protruding portions can be provided thereon for positioning the aluminum plates and the dimensional accuracy can be improved.
- Accordingly, the remarkable industrial effect can be attained.
- Many different embodiments of the invention may be constructed without departing from the spirit and scope of the invention. It should be understood that the invention is not limited to the specific embodiments described in the specification, except as defined in the appended claims.
Claims (12)
1. A flat type heat pipe, which comprises:
(a) at least two aluminum plates arranged substantially in parallel with each other and brazed to each other so as to form a heat transferring circuit therebetween; and
(b) an operating liquid filled in said heat transferring circuit.
2. A flat type heat pipe as claimed in claim 1 , wherein a corrugated aluminum plate is interposed between said at least two aluminum plates to form said heat transferring path.
3. A flat type heat pipe as claimed in claim 2 , wherein said corrugated aluminum plate is an aluminum brazing sheet.
4. A flat type heat pipe as claimed in claim 2 wherein through-holes are disposed on side walls of protrusion portions of said corrugated aluminum plate.
5. A flat type heat pipe as claimed in claim 1 , wherein a metal tube is brazed for feeding said operating liquid into said heat pipe and into an open end of said heat transferring path, and a predetermined portion of said metal tube is sealed after said operating liquid is filled by one of pressure bonding and welding.
6. A flat type heat pipe as claimed in claim 1 , wherein supporting bodies are arranged between said at least two aluminum plates which are substantially in parallel with each other, in such a manner that said at least two aluminum plates are spaced at a predetermined distance.
7. A flat type heat pipe as claimed in claim 1 , wherein a predetermined number of protrusion portions are formed on one aluminum plate of said at least two aluminum plates which are substantially in parallel with each other and leading portions of said protrusion portions are joined to the other aluminum plates.
8. A flat type heat pipe as claimed in claim 1 wherein grooves are formed on inner surfaces of said heat transferring circuit, and a wick is arranged on said heat transferring circuit.
9. A flat type heat pipe as claimed in claim 8 , wherein said wick comprises one of grooves formed on an inner surface of said at least two aluminum plates, and an uneven portion formed by melting and solidifying a brazing filler material forming said inner surface of said at least two aluminum plates.
10. A flat type heat pipe as claimed in claim 8 , wherein said wick comprises one of a wave-like plate brazed onto said at least two aluminum plates, a cylindrical wire netting, a plate-like wire netting, and a number of spheres arranged adjacent to each other.
11. A flat type heat pipe as claimed in claim 1 , wherein protruding portions are formed on one aluminum plate of said at least two aluminum plates which are substantially in parallel with each other, hole portion are disposed on the other aluminum of said at least two aluminum plates and said aluminum plates are positioned by inserting said protruding portion into said hole portion.
12. A flat type heat pipe as claimed in claim 1 wherein fins are brazed onto one of a part of said surface of said at least two aluminum plates and the whole of said surface of said at least two aluminum plates.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/998,678 US20020056542A1 (en) | 1995-12-21 | 2001-11-30 | Flat type heat pipe |
Applications Claiming Priority (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7-332867 | 1995-12-21 | ||
JP33286795 | 1995-12-21 | ||
JP8-68080 | 1996-03-25 | ||
JP6808096 | 1996-03-25 | ||
JP8-125170 | 1996-05-21 | ||
JP12517096 | 1996-05-21 | ||
JP31298096A JP3164518B2 (en) | 1995-12-21 | 1996-11-08 | Flat heat pipe |
JP8-312980 | 1996-11-08 | ||
US08/769,505 US6397935B1 (en) | 1995-12-21 | 1996-12-18 | Flat type heat pipe |
US09/998,678 US20020056542A1 (en) | 1995-12-21 | 2001-11-30 | Flat type heat pipe |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/769,505 Division US6397935B1 (en) | 1995-12-21 | 1996-12-18 | Flat type heat pipe |
Publications (1)
Publication Number | Publication Date |
---|---|
US20020056542A1 true US20020056542A1 (en) | 2002-05-16 |
Family
ID=27464944
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/769,505 Expired - Fee Related US6397935B1 (en) | 1995-12-21 | 1996-12-18 | Flat type heat pipe |
US09/998,678 Abandoned US20020056542A1 (en) | 1995-12-21 | 2001-11-30 | Flat type heat pipe |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/769,505 Expired - Fee Related US6397935B1 (en) | 1995-12-21 | 1996-12-18 | Flat type heat pipe |
Country Status (3)
Country | Link |
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US (2) | US6397935B1 (en) |
JP (1) | JP3164518B2 (en) |
DE (1) | DE19653956A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
JPH1038484A (en) | 1998-02-13 |
JP3164518B2 (en) | 2001-05-08 |
DE19653956A1 (en) | 1997-06-26 |
US6397935B1 (en) | 2002-06-04 |
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