JP2005167224A - Expansion tank device, its manufacturing method, and liquid-cooled heat radiator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate air in cooling liquid from a circulation system, to prevent the circulation system from being damaged, and to prevent the decrease in cooling liquid in the circulation system. <P>SOLUTION: The expansion tank device is provided with a tank installation base 16 having a cooling liquid passage 17 and an expansion tank 18 provided on the top surface of the tank installation base 16. The tank installation base 16 has a communication hole 19 for allowing the top surface and the cooling liquid passage 17 to communicate with each other. The expansion tank 18 has a tank body 21 having a bulged part 22 bulged upwards and opened downwards and a bottom plate 23 jointed to the lower end of the tank body 21, closing the lower end opening of the bulged part 22, and jointed to the top surface of the tank installation base 16. A through hole 25 is formed on a part corresponding to the communication hole 19 in the bottom plate 23 so as to communicate with the communication hole 19. A baffle plate 26 inclined to the central part side of the through hole 25 toward the upward direction is provided along the whole circumference on the circumferential edge of the through hole 25 in the bottom plate 23. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an expansion tank device and an expansion tank device used for a device for radiating heat generated from a heat source provided in IT equipment such as personal computers and servers, AV equipment, industrial machines, machine tools, etc. And a liquid-cooled heat radiating device including an expansion tank device.

  In this specification and claims, the term “aluminum” includes aluminum alloys in addition to pure aluminum. In addition, the top and bottom in FIG.

  Conventionally, for example, as a method of radiating heat generated from a heat source provided in a personal computer, a server, etc., an aluminum radiating board whose one side is a heat receiving surface and a radiating fin integrally provided on the other side of the radiating board The heat source is brought into contact with the heat receiving surface of the heat dissipation board and the heat is blown to the heat dissipation fin by the fan, so that heat generated from the heat generation source is released into the air through the heat dissipation board and the heat dissipation fin. The method was widely adopted.

  However, recently, for example, in personal computers and servers, applications requiring high-speed processing are increasing, and multimedia applications such as music and moving images are increasing. For this reason, for example, the operating frequency of a central processing unit (hereinafter referred to as CPU) is also increased, and the amount of heat generation is also significantly increased. In addition, these devices are required to be quiet. Therefore, sufficient heat dissipation performance cannot be obtained by the above-described method, and the required silence cannot be satisfied.

  For example, as a method of dissipating heat generated from a heat source such as an industrial machine or a machine tool, a method of releasing heat to the atmosphere using a heat pipe using a fluorocarbon working fluid has been widely adopted.

  However, there is a need to switch to a cooling system that does not use CFCs from the viewpoint of protecting the global environment.

  In order to solve such a problem, a liquid cooling type heat radiating device using a cooling liquid mainly composed of water, for example, an antifreezing liquid, has come to be used.

  For example, as a liquid-cooled heat dissipation device for a notebook personal computer, a heat receiver made of a water jacket filled with a coolant and fixed to a heat-generating electronic component, and a cooling device that circulates the coolant with both ends connected to the heat receiver With liquid circulation tube, antifreeze liquid is enclosed in the heat receiver and cooling liquid circulation tube, the heat receiver is placed in the PC main body with keyboard, and the cooling liquid circulation tube is provided in the PC main body so as to be openable and closable There has been proposed one in which a reserve tank connected to a coolant circulation tube is provided at a corner portion that is extended to the display device and is located above when the display device is opened (see Patent Document 1). In this liquid cooling type heat radiating device, the work of the reserve tank absorbs the thermal expansion when the cooling liquid is heated by the heat received from the heat source, and reduces the shortage of the cooling liquid when the cooling liquid decreases. It comes to replenish.

By the way, in order to improve the cooling efficiency in the liquid cooling type heat radiating device, it is necessary to remove air in the cooling liquid from the circulation system as much as possible. However, in the liquid-cooled heat dissipation device described in Patent Document 1, when the display device is closed, air in the reserve tank is mixed into the coolant circulation tube, and this air returns to the reserve tank even when the display device is opened. Since it is difficult, there is a problem that the cooling efficiency is lowered.
JP 2002-182797 A

  The object of the present invention is to solve the above-mentioned problems, eliminate air in the coolant from the circulation system, prevent damage to the circulation system, and prevent a decrease in the coolant in the circulation system. Another object of the present invention is to provide an expansion tank device, a method for manufacturing the expansion tank device, and a liquid-cooled heat dissipation device.

  1) A tank installation base having a coolant passage and an expansion tank provided on the upper surface of the tank installation base, and the tank installation base has a communication hole through which the upper surface and the coolant passage pass. The tank body has a bulging portion that bulges upward and opens downward, and is joined to the lower end of the tank body and closes the lower end opening of the bulging portion, and is joined to the upper surface of the tank installation base. A through hole is formed in a portion corresponding to the communication hole in the bottom plate of the expansion tank so as to communicate with the communication hole of the tank installation base, and penetrates upward at the periphery of the through hole in the bottom plate. An expansion tank device in which a baffle plate inclined toward the center of the hole is provided over the entire circumference.

  2) The tank installation base is formed by joining two upper and lower base forming plates in a laminated form, and cooling between the upper and lower base forming plates by expanding the lower base forming plate downward The expansion tank device according to 1) above, wherein a liquid passage is formed and a communication hole is formed in the upper base forming plate.

  3) The expansion tank device according to 2) above, wherein the upper and lower base forming plates are each made of metal, and the upper and lower base forming plates are joined by brazing.

  4) The upper and lower base forming plates are each made of aluminum, and the upper and lower bases are formed using the brazing material layer provided on at least one of the lower surface of the upper base forming plate and the upper surface of the lower base forming plate. 2. The expansion tank device according to 2) or 3) above, wherein the working plate is brazed.

  5) The top wall of the bulging part of the tank body is flat, and the part of the top wall facing the opening surrounded by the front end of the baffle plate protrudes downward. The expansion tank apparatus as described.

  6) The expansion tank device according to any one of the above 1) to 5), wherein the tank body and the bottom plate are each made of metal, and the outward flange and the bottom plate around the bulging portion of the tank body are brazed. .

  7) The tank body and the bottom plate are each made of aluminum, and the outward flange of the tank body and the bottom plate are brazed using the brazing material layer provided on at least one of the lower surface of the tank body and the upper surface of the bottom plate. The expansion tank device according to 6) above.

  8) The above 4) to 7), wherein the bottom plate and the upper base forming plate are brazed using a brazing material layer provided on at least one of the lower surface of the bottom plate and the upper surface of the upper base forming plate. ).

  9) A method for manufacturing the expansion tank apparatus according to 1) above, wherein the lower metal base forming plate has a coolant passage that swells downward, and the upper metal base has a penetrating communication hole. A metal tank body having a bulging portion that bulges upward and opens downward, and a metal bottom plate that closes the lower end opening of the bulging portion of the tank body, and penetrates the bottom plate In addition to forming a hole, a baffle plate inclined to the center side of the through hole is formed on the periphery of the through hole in the bottom plate over the entire circumference, and the upper base is formed on the lower base forming plate. The base plate is overlaid so that the communication hole faces the coolant passage, the bottom plate is overlaid on the upper base forming plate so that the through hole is included in the through hole, and the tank body is placed on the bottom plate. Heavy so that the baffle is in the upper bulge. A method of manufacturing an expansion tank device, comprising: joining together, upper and lower base forming plates, upper base forming plate and bottom plate, and brazing the bottom plate and tank body simultaneously.

  10) The upper and lower base forming plates, the bottom plate and the tank body are made of aluminum, and a brazing material layer is provided on at least one of the lower surface of the upper base forming plate and the upper surface of the lower base forming plate, A brazing material layer is provided on at least one of the lower surface of the tank body and the upper surface of the bottom plate, and further, a brazing material layer is provided on at least one of the lower surface of the bottom plate and the upper surface of the upper base forming plate. The method for producing an expansion tank apparatus according to 9) above, wherein the upper and lower base forming plates are brazed to each other using these brazing material layers, and the upper base forming plate and the bottom plate, and the bottom plate and the tank body are brazed.

  11) A coolant circulation path connected to both ends of the coolant passage of the tank installation base in the expansion tank apparatus according to any one of 1) to 8) above, and a heat receiver provided in the middle of the coolant circulation path And a liquid cooling type heat radiating device provided with a coolant passage in the tank installation base and a pump for circulating the coolant in the coolant circulation path.

  12) A coolant circulation path connected to both ends of the coolant passage of the tank installation base in the expansion tank apparatus according to any one of 2) to 8) above, and a heat receiver provided in the middle of the coolant circulation path And a pump for circulating the coolant in the coolant passage of the tank installation base and the coolant circulation path, and at least a part of the coolant circulation path is formed between the extended portions of the upper and lower base forming plates. Liquid-cooled heat dissipation device.

  13) A heat receiver having a coolant passage on a substrate made of two metal plates joined in a laminated manner, the expansion tank apparatus according to any one of claims 1 to 8, and a coolant passage of the heat receiver A liquid-cooling type heat dissipating device in which a coolant circulation path is provided to connect the coolant passage of the expansion tank device and the tank installation base of the expansion tank device is made of the two metal plates.

  14) The amount of the cooling liquid sealed in the cooling liquid circulation path and the cooling liquid passage fills the cooling liquid circulation path and the cooling liquid path when the expansion tank device is in the vertical state, and the expansion tank expands. When the liquid level of the cooling liquid in the outlet is located above the opening surrounded by the baffle plate tip in the bottom plate of the expansion tank, and when the expansion tank device is turned upside down, the cooling liquid circulation path and the cooling liquid path Any one of the above-mentioned 11) to 13) that satisfies the above condition and is such that the liquid level of the cooling liquid in the bulging portion of the expansion tank is located above the opening surrounded by the baffle plate tip in the bottom plate of the expansion tank A liquid-cooled heat dissipation device according to claim 1.

  15) A main body having a keyboard and a display device provided in the main body so as to be freely opened and closed. The liquid-cooled heat dissipation device according to any one of the above 11) to 14) is provided in the housing of the main body. Notebook personal computer that is located.

  In the expansion tank apparatus of 1) above, a coolant circulation path is formed in continuation with the opening at both ends of the coolant passage of the tank installation base, a heat receiver is provided in the middle of the coolant circulation path, and the coolant passage and cooling of the tank installation base If a pump that circulates the cooling liquid in the liquid circulation path is arranged, the cooling liquid heated and received by the heat generated from the heat generation source in the heat receiver is cooled by the pump in the cooling liquid circulation path and the tank installation base. Cools while returning to the heat receiver through the passage. Then, the air contained in the cooling liquid in a bubble state enters the bulging portion of the tank body through the tank installation base communication hole and the bottom plate through hole when passing through the tank installation base coolant passage, It is stored here. In addition, the air that has once entered the bulging portion is less likely to flow back into the coolant passage due to the baffle plate around the through hole. Therefore, air is excluded from the coolant in the coolant circulation path, and the cooling efficiency is improved. Moreover, even if the coolant is heated and thermally expanded by the heat received from the heat generation source, the coolant flows into the bulging portion of the expansion tank, so that the coolant circulation path is prevented from being damaged due to an increase in internal pressure. Furthermore, if excess cooling liquid is put in the expansion tank main body of the expansion tank apparatus, even if the cooling liquid decreases, the cooling efficiency is prevented from being lowered.

  According to the expansion tank devices 2) to 4), the upper and lower base forming plates can be manufactured by a simple processing method, and as a result, the tank installation base can be manufactured relatively easily.

  According to the expansion tank device of the above 5), the air that has entered the bulging portion of the tank body is less likely to flow back into the coolant passage of the tank installation base.

  According to the expansion tank devices of the above 6) and 7), the tank body and the bottom plate can be manufactured by a simple method, and as a result, the expansion tank can be manufactured relatively easily.

  According to the expansion tank device of 8), the entire expansion tank device can be manufactured relatively easily.

  According to the method for manufacturing an expansion tank device of 9) and 10) above, the entire expansion tank device can be manufactured relatively easily.

  According to the liquid-cooling type heat dissipating device of the above 11) to 13), the cooling liquid heated by receiving heat generated from the heat source in the heat receiver passes through the cooling liquid circulation path and the cooling liquid path of the tank installation base by the pump. Cools while passing back to the heat receiver. Then, the air contained in the cooling liquid in a bubble state enters the bulging portion of the tank body through the tank installation base communication hole and the bottom plate through hole when passing through the tank installation base coolant passage, It is stored here. In addition, the air that has once entered the bulging portion is less likely to flow back into the coolant passage due to the baffle plate around the through hole. Therefore, air is excluded from the coolant in the coolant circulation path, and the cooling efficiency is improved. Moreover, even if the coolant is heated and thermally expanded by the heat received from the heat generation source, the coolant flows into the bulging portion of the expansion tank, so that the coolant circulation path is prevented from being damaged due to an increase in internal pressure. Furthermore, if excess cooling liquid is put in the expansion tank main body of the expansion tank apparatus, even if the cooling liquid decreases, the cooling efficiency is prevented from being lowered.

  According to the liquid cooling type heat dissipation device of 14) above, the air in the bulging portion of the expansion tank is prevented from flowing back into the coolant passage as much as possible regardless of the posture of the expansion tank device. .

  According to the notebook personal computer of 15) above, heat-generating electronic components such as a CPU can be efficiently cooled, and quietness is improved.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, the direction indicated by the arrow X in FIG. 1 is referred to as the left, the opposite direction is referred to as the right, the direction indicated by the arrow Y is also referred to as the front, and the opposite direction is referred to as the rear.

  1 and 2 show the overall configuration of a liquid-cooled heat radiating device provided with an expansion tank device according to the present invention, and FIGS. 3 to 7 show the configuration of the main part thereof. 8 and 9 show a method for manufacturing a liquid-cooled heat dissipation device.

  1 and 2, the liquid-cooled heat radiating device (1) is a rectangular shape that is long in the left-right direction, and is composed of two high thermal conductive plates, for example, aluminum plates (2) and (3) joined in a stacked manner. A heat receiver (5) having a coolant passage (7), an expansion tank device (14) having a coolant passage (17), and both coolant passages (7) and (17) are connected to the substrate (4). The coolant circulation path (6) is provided integrally, and both coolant passages (7), (17) and the coolant circulation path (6) contain coolant that is non-corrosive to aluminum made of antifreeze etc. It is a thing. The upper aluminum plate (2) is made of an aluminum brazing sheet having a brazing filler metal layer on the lower surface, the lower aluminum plate (3) is made of a bare material, and both aluminum plates (2) and (3) are made of the upper aluminum plate (2). It is brazed using a brazing material layer.

  As shown in detail in FIGS. 3 and 4, the heat receiver (5) is composed of upper and lower aluminum plates (2) and (3), and a coolant extending between the aluminum plates (2) and (3) in the front-rear direction. A heat receiver body (8) in which a passage (7) is formed, and a highly heat conductive material, for example, an aluminum extruded shape, arranged side by side in the left and right direction in the coolant passage (7) of the heat receiver body (8). And two flat tubes (9).

  The upper surface of the upper aluminum plate (2) constituting the heat receiver body (8) is a heat receiving portion (11) with which the heating element (12) is in thermal contact. The coolant passage (7) of the heat receiver body (8) is formed by causing the lower aluminum plate (3) to bulge downward, and its front end gradually narrows toward the tip. . The coolant passage (7) has a front end opened and a rear right end opened. The portion including both ends of the flat tube (9) in the upper aluminum plate (2) constituting the heat receiver main body (8) is bulged outwardly over the total length of the two flat tubes (9). The brazing material inflow preventing bulging portion (13) extending in the left-right direction is formed.

  Each flat tube (9) is formed in parallel and has a plurality of hole-like passages (9a) extending in the length direction (front-rear direction) of the coolant passage (7). Both ends of each flat tube (9) are located in the middle part of the bulging part (13) in the width direction (front-rear direction). The entire portion of the upper wall of both flat tubes (9) in contact with the lower surface of the upper aluminum plate (2) is brazed to the upper aluminum plate (2) using the brazing material layer on the lower surface of the upper aluminum plate (2). Has been. The lower walls of both flat tubes (9) are brazed to the lower aluminum plate (3) using a sheet-like brazing material shorter than the flat tubes (9) except for both ends thereof.

  In addition, as a flat tube, it may replace with the thing made from an aluminum extruded shape, and may use what formed the several hole-shaped channel | path by inserting an inner fin in the inside of an aluminum electric sewing pipe. Also, two flat wall forming portions formed by rolling an aluminum brazing sheet having a brazing filler metal layer on one side and connected via a connecting portion, and the opposite side of the connecting portion in each flat wall forming portion A side wall forming portion integrally formed in a protruding shape from the side edges of the flat wall forming portion, and a plurality of partition wall forming portions integrally formed in a protruding shape from the two flat wall forming portions at a predetermined interval in the width direction of the flat wall forming portion. Using a plate provided with a hole-like passage by bending a plate with a hairpin shape at the connecting portion, butting the side wall forming portions with each other and brazing each other, and forming the partition wall with the partition wall forming portion Also good. In this case, the side wall forming portion and the partition wall forming portion are formed on the brazing material surface side of the aluminum brazing sheet.

  The expansion tank device (14) is provided on the right end of the substrate (4), and behind the expansion tank device (14), the coolant passage (7) of the heat receiver (5) and the coolant circulation path (6 ) And a pump (15) for circulating the coolant in the coolant passage (17) of the expansion tank device (14).

  As shown in detail in FIG. 5, the expansion tank device (14) is composed of upper and lower aluminum plates (2) and (3) (both upper and lower base forming plates), and between the aluminum plates (2) and (3). A tank installation base (16) in which a coolant passage (17) extending in the front-rear direction is formed, and an expansion tank (18) provided on the tank installation base (16).

  The coolant passage (17) of the tank installation base (16) is formed by expanding the lower aluminum plate (3) downward. The upper aluminum plate (2) constituting the tank installation base (16) is formed with a circular communication hole (19) for allowing the coolant passage (17) to communicate with the upper surface of the tank installation base (16). The shape of the communication hole (19) is not limited to a circle.

  The expansion tank (18) has an aluminum tank body (21) having a bulge portion (22) that bulges upward and opens downward, and closes the lower end opening of the tank body (21) and tank body (21). And an aluminum bottom plate (23) extending rearward.

  The tank body (21) is formed by bulging upward a portion excluding the peripheral edge of a circular plate made of an aluminum brazing sheet having a brazing filler metal layer on the lower surface, and the bulging portion (22) It has a truncated cone shape and its peripheral wall (22a) is inclined inward in the radial direction upward. Further, the top wall (22b) of the bulging portion (22) is flat, and a downward projecting portion (24) is formed at the center thereof. The outward flange (21a) around the bulging part (22) in the tank body (21) uses the brazing material layer so that the downward projecting part (24) is located directly above the communication hole (19). Then, it is brazed to the bottom plate (23). The tank body (21) is not limited to one formed from a circular plate, and the bulging portion (22) is not limited to a truncated cone shape.

  The bottom plate (23) is an aluminum brazing sheet having a brazing filler metal layer on the lower surface and has a long shape in the front-rear direction. The brazing filler metal layer is used to braze the upper aluminum plate (2) of the tank installation base (16). It is attached. In the part of the bottom plate (23) corresponding to the communication hole (19) of the upper aluminum plate (2), a circular through hole (25) larger than the communication hole (19) is communicated with the communication hole (19). It is formed concentrically with. The through hole (25) is not limited to a circular shape. A baffle plate (26) inclined inward in the radial direction toward the upper side is integrally formed on the peripheral edge of the through hole (25) in the bottom plate (23), and the tip of the baffle plate (26) An opening (27) is formed surrounded by. The downward projecting portion (24) faces the opening (27).

  The pump (15) is attached to a portion of the bottom plate (23) of the expansion tank device (14) protruding rearward from the tank body (21).

  The coolant circulation path (6) of the liquid cooling type heat radiating device (1) is formed by expanding the lower aluminum plate (3) downward, and the upper and lower aluminum constituting the tank installation base (16). It is formed between the leftward extensions of the plates (2) and (3). The coolant circulation path (6) is a linear portion (6a) that connects the front end opening of the coolant passage (7) of the heat receiver (5) and the front end opening of the coolant passage (17) of the expansion tank device (14). ) And a serpentine portion (6b) that communicates the opening at the right end of the rear end of the coolant passage (7) and the rear end opening of the coolant passage (17). The amount of the coolant sealed in the coolant passage (7) of the heat receiver (5), the coolant passage (17) of the expansion tank device (14), and the coolant circulation path (6) is as shown in FIG. When the substrate (4) is in a vertical state, the coolant passages (7), (17) and the coolant circulation passage (6) are filled, and the expansion portion (22) of the expansion tank (18) The liquid level of the cooling liquid is located above the opening (27) at the tip of the baffle plate (26) in the bottom plate (23) of the expansion tank (18), and the substrate (4) is turned upside down as shown in FIG. The coolant passages (7), (17) and the coolant circulation path (6) are filled, and the liquid level of the coolant in the expansion portion (22) of the expansion tank (18) is The amount is such that it is located above the opening (27) at the tip of the baffle plate (26) in the bottom plate (23) of (18).

  The liquid-cooled heat dissipation device (1) described above is, for example, a notebook personal computer including a personal computer main body having a keyboard and a display device provided in the personal computer main body so as to be freely opened and closed. It arrange | positions and CPU (heat_generation | fever source) is made to contact thermally with the heat-receiving part (11) of the heat receiver (5) of a liquid cooling type heat radiating device (1). When the notebook personal computer is started, the pump (15) causes the coolant to flow into the coolant passage (7) of the heat receiver (5), the coolant passage (17) of the expansion tank device (14), and the coolant circulation path (6). It can be circulated inside. The heat generated from the CPU flows through the upper aluminum plate (2) through the hole passage (9a) of the flat tube (9) disposed in the coolant passage (7) of the heat receiver (5). It is transmitted to. The cooling liquid passes through the cooling liquid circulation path (6) and the cooling liquid passage (17) of the expansion tank device (14) and returns to the cooling liquid passage (7) of the heat receiver (5). The heat of the liquid is radiated to the outside through the upper and lower aluminum plates (2) and (3), and the cooling liquid is cooled. Heat generated from the CPU is radiated by repeating such operations.

  If the amount of heat generated from the CPU is large, a radiator (not shown) with radiation fins is placed in a place away from the heat receiver (5) in the board (4), and the output is higher than in the conventional case. However, a small and quiet cooling fan (not shown) may be used to blow the radiating fins of the radiator.

  When air contained in the coolant in the form of bubbles passes through the coolant passage (17) of the expansion tank device (14), it penetrates the communication hole (19) and the bottom plate (23) of the tank installation base (16). It passes through the hole (25) and enters the bulging portion (22) of the tank body (21) and is stored here. Moreover, the air that has once entered the bulging portion (22) is unlikely to flow back into the coolant passage (17) by the action of the baffle plate (26) around the through hole (25). Therefore, air is excluded from the coolant in the coolant circulation path (6), and the cooling efficiency is improved. Even if the coolant is heated and thermally expanded by the heat received from the CPU, the coolant flows into the tank body (21) of the expansion tank (18). Is prevented from being damaged. Further, if an excess amount of cooling liquid is placed in the bulging portion (22) of the tank body (21) of the expansion tank device (14), a decrease in cooling efficiency is prevented even if the cooling liquid is reduced.

  A method for manufacturing the above-described liquid-cooled heat radiating device (1) will be described with reference to FIGS.

  The upper aluminum plate (2) made of an aluminum brazing sheet having a brazing filler metal layer (31) on the lower surface is subjected to press working, a brazing filler inflow preventing bulging portion (13) and an expansion tank device ( The communication hole (19) of 14) is formed at the same time. The lower aluminum plate (3) made of an aluminum bare material is subjected to press working, the coolant passage (7) of the heat receiver (5), the coolant passage (17) of the expansion tank device (14), and the coolant circulation passage ( 6) is simultaneously formed in a downward bulging shape. A circular plate made of an aluminum brazing sheet having a brazing filler metal layer (33) on the lower surface is pressed to form a bulging portion (22) and a downward projecting portion (24) at the same time, thereby forming a tank body (21). Further, the bottom plate (23) made of an aluminum brazing sheet having a brazing filler metal layer (32) on the lower surface is pressed to form a through hole (25), a baffle plate (26), and an opening (27).

  Next, two flat extruded tubes (9) made of extruded aluminum are arranged in the left-right direction in the coolant passage (7) of the heat receiver (5). At this time, between the lower surface of the flat tube (9) and the bottom surface of the downward bulging portion (22), a sheet-like brazing material (30) shorter than the flat tube (9), both ends of the flat tube (9) It arrange | positions so that it may be located inside a length direction rather than the both ends.

  Thereafter, the upper and lower aluminum plates (2) and (3) are overlapped, and the bottom plate (23) and the tank body (21) are arranged. At this time, both ends of the flat tube (9) are positioned in the intermediate portion in the width direction of the brazing material inflow preventing bulging portion (13). The upper and lower aluminum plates (2) and (3), the upper and lower aluminum plates (2) and (3) and the flat tube (9), the upper aluminum plate (2) and the bottom plate (23), and the bottom plate (23) and the tank body ( 21) and brazing at the same time. These brazings are made of the brazing material layer (31) of the upper aluminum plate (2), the brazing material (30) of the sheet, the brazing material layer (32) of the bottom plate (23) and the brazing material layer of the tank body (21) ( 33). Thus, the liquid cooling type heat radiating device (1) is manufactured.

  In the production of the liquid cooling type heat radiating device (1), the upper aluminum plate (2) is formed with a bulging portion (13), and the flat tube (9) and the lower aluminum plate (3) are formed into a flat tube ( 9) and brazed by a sheet-like brazing material (30) arranged so that both ends are located on the inner side in the longitudinal direction than both ends of the flat tube (9). At this time, the molten brazing material is prevented from flowing into the hole-like passage (9a) of the flat tube (9).

  In the above embodiment, the expansion tank device (14) is provided integrally with the substrate (4) of the liquid cooling type heat dissipation device (1) together with the heat receiver (5) and the coolant circulation path (6). Instead of this, only the expansion tank device is formed separately from the substrate (4), and one end of a tube separate from the expansion tank device is connected to both ends of the coolant passage of the expansion tank device, By connecting the other end of these tubes to the coolant circulation path (6) of the substrate (4), a liquid-cooled heat dissipation device may be formed. Further, the expansion tank device and the heat receiver having the above-described configuration or other appropriate configuration are formed separately, and the cooling fluid passage of the expansion tank device and the cooling fluid passage of the heat receiver are connected by, for example, separate tubes. By doing so, a liquid-cooled heat dissipation device may be formed.

  In the above embodiment, the upper aluminum plate (2) and the bottom plate (23) forming the tank installation base (16) of the expansion tank device (14) are the brazing material layer (32) on the bottom surface of the bottom plate (23). However, instead of this, a brazing material layer is formed on the upper surface of the upper aluminum plate (2) and a brazing material layer is not formed on the lower surface of the bottom plate (23). (2) The upper aluminum plate (2) and the bottom plate (23) may be brazed using the brazing material layer on the upper surface. Further, the outward flange (21a) and the bottom plate (23) of the tank body (21) are brazed using the brazing material layer (33) on the lower surface of the tank body (21), but instead, A brazing material layer is formed on the upper surface of the bottom plate (23), and a brazing material layer is not formed on the lower surface of the tank body (21). The outward flange (21a) and the bottom plate (23) may be brazed.

It is a perspective view which shows the whole structure of the liquid cooling type thermal radiation apparatus provided with the expansion tank apparatus by this invention. It is an exploded perspective view similarly. It is the III-III line expanded sectional view of FIG. It is the IV-IV line expanded sectional view of FIG. It is the VV line expanded sectional view of FIG. FIG. 6 is a cross-sectional view corresponding to FIG. 5 in which a tank installation base is in a vertical state. It is sectional drawing equivalent to FIG. 5 which made the tank installation base upside down. It is sectional drawing of the part of the heat receiver which shows the manufacturing method of a liquid cooling type thermal radiation apparatus. It is sectional drawing of the part of the expansion tank apparatus which shows the manufacturing method of a liquid cooling type thermal radiation apparatus.

Explanation of symbols

(1): Liquid-cooled heat dissipation device
(2): Upper aluminum plate (upper base plate)
(3): Lower aluminum plate (lower base forming plate)
(5): Heat receiver
(6): Coolant circuit
(7): Coolant passage
(12): Heating element (heating source)
(14): Expansion tank device
(16): Tank installation base
(17): Coolant passage
(18): Expansion tank
(19): Communication hole
(21): Tank body
(21a): outward flange
(22): bulge
(22b): Top wall
(23): Bottom plate
(24): Downward protrusion
(25): Through hole
(26): Baffle plate
(27): Opening

Claims (15)

A tank installation base having a coolant passage and an expansion tank provided on the upper surface of the tank installation base are provided, and the tank installation base has a communication hole for allowing the upper surface and the coolant passage to pass through. A tank body having a bulging portion that bulges upward and opens downward, and a bottom plate that is joined to the lower end of the tank body and closes the lower end opening of the bulging portion, and is joined to the upper surface of the tank installation base; A through hole is formed in a portion corresponding to the communication hole in the bottom plate of the expansion tank so as to communicate with the communication hole of the tank installation base. An expansion tank device in which a baffle plate inclined toward the center is provided over the entire circumference. The tank installation base is formed by joining two upper and lower base forming plates in a laminated manner, and the lower base forming plate bulges downward to provide a coolant passage between the upper and lower base forming plates. The expansion tank apparatus according to claim 1, wherein a communication hole is formed in the upper base forming plate. The expansion tank apparatus according to claim 2, wherein the upper and lower base forming plates are made of metal, and the upper and lower base forming plates are joined by brazing. Both the upper and lower base forming plates are each made of aluminum, and the upper and lower base forming plates are formed using the brazing material layer provided on at least one of the lower surface of the upper base forming plate and the upper surface of the lower base forming plate. The expansion tank apparatus according to claim 2 or 3, wherein the expansion tank apparatus is brazed. The expansion | swelling in any one of Claims 1-4 with which the top wall of the bulging part of a tank main body is flat, and the part which faces the opening enclosed by the baffle plate front-end | tip is protruded below. Tank equipment. The expansion tank device according to any one of claims 1 to 5, wherein the tank main body and the bottom plate are each made of metal, and the outward flange and the bottom plate around the bulging portion of the tank main body are brazed. The tank body and the bottom plate are each made of aluminum, and the outward flange of the tank body and the bottom plate are brazed using a brazing material layer provided on at least one of the lower surface of the tank body and the upper surface of the bottom plate. The expansion tank apparatus according to claim 6. The bottom plate and the upper base forming plate are brazed using a brazing material layer provided on at least one of the lower surface of the bottom plate and the upper surface of the upper base forming plate. An expansion tank device according to any one of the above. A method for manufacturing an expansion tank device according to claim 1, wherein a metal lower base forming plate having a coolant passage bulging downward, and a metal upper base forming plate having a penetrating communication hole, Preparing a metal tank body having a bulging portion that bulges upward and opens downward, and a metal bottom plate that closes the lower end opening of the bulging portion of the tank body, and has a through-hole in the bottom plate. Forming a baffle plate that is inclined to the center side of the through-hole toward the upper side at the periphery of the through-hole in the bottom plate, and the upper base-forming plate on the lower base-forming plate. Are stacked so that the communication holes face the coolant passage, and the bottom plate is stacked on the upper base forming plate so that the communication holes are included in the through holes, and the tank body is placed on the bottom plate. So that it comes into the upper bulge Keying, upper and lower base-forming plate to each other, the upper base-forming plate and the bottom plate, and the bottom plate and the method of manufacturing the expansion tank apparatus comprising simultaneously brazing the tank body. Both the upper and lower base forming plates, the bottom plate, and the tank main body are formed of aluminum, and a brazing material layer is provided on at least one of the lower surface of the upper base forming plate and the upper surface of the lower base forming plate, and the tank main body. A brazing material layer is provided on at least one of the lower surface and the upper surface of the bottom plate, and a brazing material layer is provided on at least one of the lower surface of the bottom plate and the upper surface of the upper base forming plate, 10. The method of manufacturing an expansion tank apparatus according to claim 9, wherein the upper and lower base forming plates, the upper base forming plate and the bottom plate, and the bottom plate and the tank body are brazed using these brazing material layers. The expansion tank apparatus according to any one of claims 1 to 8, wherein a coolant circulation path is connected to both ends of the coolant passage of the tank installation base, a heat receiver provided in the middle of the coolant circulation path, and a tank A liquid-cooling type heat radiating device including a cooling liquid passage on an installation base and a pump for circulating the cooling liquid in the cooling liquid circulation path. The expansion tank apparatus according to any one of claims 2 to 8, wherein a coolant circulation path is connected to both ends of the coolant passage of the tank installation base, a heat receiver provided in the middle of the coolant circulation path, and a tank A cooling liquid passage on the installation base and a pump for circulating the cooling liquid in the cooling liquid circulation path, and at least a part of the cooling liquid circulation path is formed between the extended portions of the upper and lower base forming plates Cold heat dissipation device. A heat receiver having a coolant passage on a substrate made of two metal plates joined in a laminated manner, the expansion tank device according to any one of claims 1 to 8, and the coolant passage and expansion of the heat receiver A liquid-cooled heat radiating device provided with a coolant circulation path for connecting a coolant passage of the tank device, and a tank installation base of the expansion tank device comprising the two metal plates. When the expansion tank device is placed in a vertical state, the amount of the cooling liquid sealed in the cooling liquid circulation path and the cooling liquid passage fills the cooling liquid circulation path and the cooling liquid passage, and also in the expansion portion of the expansion tank. When the expansion tank device is turned upside down when the liquid level of the cooling liquid is positioned above the opening surrounded by the baffle plate tip in the bottom plate of the expansion tank, the cooling liquid circulation path and the cooling liquid path are filled. In addition, the amount of the coolant in the bulging portion of the expansion tank is such that the liquid level is positioned above the opening surrounded by the baffle plate tip in the bottom plate of the expansion tank. Liquid cooling type heat dissipation device. It consists of a main-body part which has a keyboard, and the display apparatus provided in the main-body part so that opening and closing is possible, The liquid-cooling type thermal radiation apparatus in any one of Claims 11-14 is arrange | positioned in the housing of a main-body part. Notebook personal computer.

Images