JPH0457399A - Composite-type heat sink - Google Patents

Abstract

PURPOSE:To make it possible to manufacture a small-sized, high-efficiency composite-heat sink simply and at low cost by a method wherein a heat sink and a loop type fine tube heat pipe are formed integrally with each other. CONSTITUTION:A heat sink is used as a first constituent element, a zigzag loop type fine tube heat pipe is used as a second constituent element, prescribed parts of these elements are pressed into strip grooves 3, which are the first constituent element, are bonded to a fin 2 with said strip grooves formed therein, are formed integrally with the fin 2 and the heat sink and the heat pipe are formed into a composite heat sink. The heat pipe is a thin-walled fine tube and as soft copper or soft Al is generally used as the material for the heat pipe, it is easy to shape the heat pipe into a form suitable to press the heat pipe into the strip grooves 3 of the heat sink and the heat pipe can be deformed by press-fitting so as to closely adhere on the inner walls of the strip grooves 3. Accordingly, a group 5-1 of thin tube container pressed into the grooves 3 of the heat sink or each single tube is easily adhered closely to the fin 2 of the heat sink by press-fitting. Thereby, the heat dissipation of a heat dissipation characteristic several times or scones of times as good as that as the heat sink single body is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (11) Purpose of the Invention [Field of Industrial Application] The present invention relates to the structure of a heat sink, and particularly to the structure of a composite heat sink formed by combining a heat sink and a meandering loop-type thin tube heat pipe.

[Conventional technology]

In the conventional heat sink, as shown in FIG. 5, a predetermined portion of a metal plate with good thermal conductivity is used as a heat receiving plane 1, and other portions are provided with a plurality of flat radiation fins 2 and grooves formed by the radiation fins 2. 3 is installed.

When a large amount of heat radiation is required, the height of the fins is increased and the number of fins is increased.

In the loop type thin tube heat pipe, as shown in FIGS. 6 and 7, the long loop type thin tube container 5 is shaped into a meandering shape with many turns including a spiral shape of various shapes or a group of straight tube parts, and the It is used by attaching a heat receiving plate 4, a heat sink plate 7, etc. to a part.

[Problems to be Solved by the Invention] Although the heat sink as shown in FIG. It was difficult to meet resistance. In addition, large-capacity heat radiation requires a large number of heat-radiating fins and a large number of grooves, making the device large and heavy. These were the problems that the heat sink had.

The loop type capillary heat pipe has good sensitivity and is lightweight because the working fluid in the capillary container 5 circulates at high speed within the loop at a circulation speed corresponding to the heat amount due to the action of the check valve 6, thereby transporting the heat amount. Even if configured to transport a large amount of heat, the weight is incomparably lighter than a heat sink, and it is possible to transport heat with low thermal resistance. However, when configured as a heat radiator, in the case of a heat receiving plate of a normal heat radiator such as the heat receiving plate 4 in FIG. 6(a) and the heat receiving plate 4-1.4-2.4-3 in FIG. 6(b). Also, as shown in FIGS. 7(a) and 7(b), the heat receiving section capillary container 5-1 and the heat dissipating section capillary container 5 are connected via the high temperature connecting capillary tube 5-4 and the low temperature connecting capillary tube 5-5.
- Even in the case of the heat receiving plate 4 and the heat sink 7 of a heat sink in which the heat sinks 3 are separated, it is necessary to align the thin tube containers and closely adhere them to the heat receiving plate 4 and the heat sink 7 by soldering, adhesive bonding, etc. There is. This work is relatively difficult and time consuming. Furthermore, as can be seen from FIG. 6(a), it is difficult to form a heat receiving plane with a sufficient area by simply disposing a flat heat receiving plate 4 on a portion of the loop, and the loop type as shown in FIG. Generally, means is used to enlarge the heat receiving plane by forming the thin tube container 5-1.degree. However, it is clear from the figure that this work is several times more difficult and time consuming than that shown in Figure 6 (a). As described above, the loop type thin tube heat pipe has a problem in that forming the heat receiving and dissipating portion requires difficult work.

Structure of the Invention [Means for Solving the Problems] Heat sinks and loop-type thin tube heat pipes as heat radiating means having a heat receiving part and a heat radiating part each have the above-mentioned major problems, but they can be combined. By using a composite heat sink, these problems can be completely solved, and the advantages of both can be utilized to provide an excellent new heat dissipation means. That is, the heat sink as illustrated in FIG. 5 is the first component of the composite heat sink, the serpentine loop tube heat pipe is the second component, and a predetermined portion of the second component is in the groove of the first component. is press-fitted into the
The basic structure of the means for solving the problems of the present invention is that the heat sink is integrated with the fins forming the grooves by adhesion by a predetermined means to form a composite heat sink.

[For production]

The original purpose of forming the grooves and fins of a heat sink is to dissipate heat, and the purpose is to expand the heat dissipation area and improve heat transfer. Moreover, a loop-type thin tube heat pipe is a thin-walled thin tube, and its material is generally made of mild steel or soft aluminum.

Therefore, it is extremely easy to shape the tube into the most suitable shape for press-fitting into the groove, and even a single tube can be deformed by press-fitting so as to fit closely against the inner wall of the groove. Therefore, the thin tube containers or single tubes press-fitted into the grooves of the heat sink easily come into close contact with the fins of the heat sink.

At this time, if solder or a thermally conductive adhesive is used and press-fitted, the thermal resistance will be close to zero and the contact area will be sufficiently expanded. Therefore, the heat sink after press-fitting and bonding can be transformed into an ideal heat receiving part of a composite heat sink. At the same time, the remaining portion of the loop-type thin tube heat pipe is transformed into a heat dissipation section with heat dissipation properties several times or tens of times better than that of a single heat sink.

Since the heat dissipation capacity of the composite heat sink is extremely large, it is not necessary to use a large heat sink, and an extremely small heat sink is sufficient. Since press-fitting for the combination of a heat sink and a loop-type thin tube heat pipe is extremely easy, it is much easier and the work process is simpler than forming a heat-receiving plane and a heat-radiating plane on a loop-type thin-tube heat pipe.

〔Example〕

First Embodiment FIG. 1 shows an embodiment of the most effective compact composite heat sink. The first part forming the heat receiving part
The heat sink component consists of a heat receiving plane 1 and three fins 2.
It consists of two grooves 3 formed by fins and fins. The heat receiving plane 1 has a width of 25.4 m and a length of 35 m. Groove 3 is 8.2 kaku in width and 35 kaku in length. Fin 2 has a thickness of 3■,
The height is 12 mm and the length is 35 m, and the height from the heat receiving plane of the heat sink is 15 m.

The second component, the loop type thin tube heat pipe, consists of a heat receiving section thin tube container 5-1 and a heat radiation section thin tube container 5-3. Two units are used, each having an oval spiral shape of .3 m in length, 40 m in major diameter, and 21 turns.The two ends of each unit are connected to each other by a connecting capillary tube 5-2 to form a loop.

The hydraulic fluid sealed in the loop circulates by itself in the direction of the arrow by the action of the check valves 6-1 and 6-2, and the amount of heat absorbed by the heat receiving part 5-1 is transferred to the heat radiating part 5-3, where it is radiated. . The loop-type thin tube heat pipe is press-fitted into the groove 3 of the heat sink in the heat receiving part 5-1, and is integrated with the fin 2 by being bonded with solder or a thermally conductive adhesive. Although not shown in the drawings, the heat dissipating tube containers are spread out in a staggered pattern from left to right. Such a composite heat sink absorbs the amount of heat received from the heat receiving plane 1 by the heat receiving surface sufficiently expanded by the fins 2 and the grooves 3, and efficiently radiates the heat through the heat radiating portion thin tube container 5-3. Heat radiation is achieved by convective wind flowing as shown by solid arrows or broken arrows. The composite heat sink according to this example exhibited the ability to dissipate heat with a thermal resistance of 0.24"C/W at a wind speed of 3m/sec and a received heat amount of 50W. This means that the temperature rise of the heat receiving part was only 12°C. This means that it has exceptionally high performance for such a small heat sink.

Second Embodiment The second embodiment illustrated in the second circuit diagram is an example in which a plurality of heat sinks as the first component are used. That is, the first
A part of the heat dissipation section in the embodiment is also press-fitted and bonded to the second heat sink. In this case, the intermediate portion between the two heat sinks is used as the heat dissipation portion 5-3 as shown in the figure. Heat dissipation part 5
-3, every other thin tube container is unfolded as shown in the figure in a staggered arrangement to ensure good ventilation. In the drawings of the first embodiment, illustrations are omitted for the sake of brevity, but in reality, the system is developed and implemented in this manner in FIG. 1 as well. Second
The embodiment absorbs and radiates heat from a plurality of heat-receiving parts, but has another feature of making the temperature of the plurality of heat-receiving parts uniform.

Third Embodiment In the first and second embodiments, a large number of loop-type thin tube containers were press-fitted into each groove 3, but in the third and subsequent embodiments, a large number of thin tube containers were press-fitted into each groove 3. 1 each for each
A thin tube container for books is press-fitted and glued. The third embodiment is a composite heat sink of a type in which a heat receiving part and a heat radiating part are arranged separately and are connected by a connecting capillary tube for circulating the working fluid, and is shown in each schematic diagram in FIG. 2-1 is a group of fins of a heat sink for receiving heat, 2-24;! This is a group of fins for a heat sink for heat dissipation. Heat receiving and dissipating surface 1-1 (or 1-2
) and the groove 3-1 (or 3-2) do not appear in the drawing. 5-1 and 5-3 are a heat receiving section thin tube container group and a heat radiating section thin tube container group, respectively, of the loop type thin tube container.

In FIG. 3(a), a large number of connecting tubes are used, with the heat receiving and discharging parts being connected by high temperature connecting tubes 54 and low temperature connecting tubes 5-5 for each turn of the tube container. On the other hand, in FIG. 3(b), the thin tube containers 5-1 and 5-
Reference numeral 3 indicates a heat receiving and dissipating section in which one thin tube container is repeatedly turned many times for each of the heat receiving section and the heat dissipating section. Therefore, only two thin tubes, the high-temperature connecting tube 5-4 and the low-temperature connecting tube 5-5, are required to connect the heat receiving and radiating parts. FIG. 3(c) is a cross-sectional view showing a state in which the thin tube container 5-1 (or 5-3) is press-fitted and bonded to the heat sink in the heat receiving section or the heat dissipating section. Each heat sink is the heat receiving surface 1 of the heat receiving part.
-13 groove group 3-1. Consisting of fin group 2-1, or heat radiation surface 1-29 groove group of heat radiation part 3-2 Fin group 2-2
It consists of Each of the thin tube containers 5-1 (or 5-3) is press-fitted into the groove group 3-1 (or 3-2), and at the same time, they are bonded with solder or a thermally conductive adhesive to form the fin group 2. -1 (or 2-2).

This embodiment has the advantage that the formation of the heat receiving and dissipating section is extremely easy and that the heat transfer characteristics are excellent.

In this embodiment, when in use, the heat receiving surface 1-1 and the heat dissipating surface 1- of the heat sink are connected to the heat generating element and the heat absorbing body which are separately arranged.
This is done by gluing 2. The example shown in FIG. 3(a) is used when high performance is required, but there is a problem in that the installation work is complicated because there are a large number of connecting tubes. Figure 3 (b) solves this problem and is extremely easy to install.
Since all of the circulating working fluid is concentrated in the two connecting thin tubes and circulated, there is an increase in thermal resistance due to the resistance of the tubes, so it is necessary to be prepared for a slight decrease in performance when applying this method.

Fourth Embodiment This embodiment is schematically illustrated in FIG. and grooves 3-1 of the heat sink, which is the first component.
(See Fig. 3 (C)) A heat receiving part that is press-fitted into the fin 2-1 and integrated with the fin 2-1, and a high-temperature connecting capillary 5-4 and a low-temperature connecting capillary 5-5 that connect the heat receiving part and the heat radiating part. It is characterized by its three parts being integrated in a loop. In this embodiment as well, the heat receiving part is easy to form, and at the same time, the performance of the composite heat sink is greatly improved despite air-cooled heat dissipation due to the high performance heat receiving part integrated with the heat sink. Similar to the third embodiment, the installation work at the time of application is easy.

The arrow on the heat dissipation section in the figure indicates the cooling air.

C1 Effects of the invention In the present invention, the heat sink and the loop-type thin tube heat pipe are integrated, so that the advantages of both work effectively.
It becomes possible to easily and inexpensively manufacture a compact, high-performance composite heat sink. Furthermore, it is easy to arrange when used.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a first embodiment of a composite heat sink according to the present invention. FIG. 2 is a schematic front view of the second embodiment. FIGS. 3A and 3B are schematic front views of the third embodiment. FIG. 3(C) is a partial sectional view of FIGS. 3(A) and 3(B). FIG. 4 is a schematic front view of the fourth embodiment. FIG. 5 is a perspective view of a conventional heat sink. FIGS. 6(a) and 6(b) are perspective views of a conventional example of a loop type thin tube heat vibable heat radiator. FIGS. 7(a) and 7(b) are schematic diagrams of a conventional example of a heat radiator with separate heat receiving and dissipating parts applied to a loop-type thin tube heat pipe. DESCRIPTION OF SYMBOLS 1... Heat receiving plane, 2... Radiation fin, 3... Groove, 4... Heat receiving plate, 5-1... Heat receiving part thin tube container,
5-3... Heat radiation part thin tube container, 5-4... High temperature connecting thin tube, 5-5... Low temperature connecting thin tube, 6... Check valve.

Claims (5)

[Claims] (1) A heat sink in which a plurality of parallel flat fins and grooves formed as fin gaps between the parallel fins are arranged on a predetermined surface of a metal plate with good thermal conductivity, and these serve as heat dissipation means. is the first component, and both ends of a long meandering capillary container consisting of a large number of turns and a group of straight pipes are connected to each other to form a loop-type capillary container. The second component is a meandering loop thin tube heat pipe configured to circulate in a predetermined direction by a predetermined means and transport heat from the heat receiving part to the heat radiating part of the container, and 2 components are combined, a predetermined portion of the second component is press-fitted into a groove of the first component, and a fin forming the groove and a predetermined means are formed. A composite heat sink characterized by being integrated with adhesive. (2) A predetermined portion is press-fitted into the groove of the first component, and the remaining portion of the second component is integrated with the fins forming the groove, and the remaining portion is the heat sink of the first component. The fins protrude from the fin portion of the heat sink and are arranged in a shape with good ventilation to form a group of auxiliary heat dissipation fins that assist the heat dissipation of the fins of the heat sink. Composite heat sink. (3) It is constructed by combining a plurality of first components and a single second component, and a predetermined portion is press-fitted into the grooves of the plurality of first components to form the grooves. The remaining portion of the second component that is adhesively integrated with the fins that are attached to the first
Claim 1, characterized in that the fins are formed as a group of auxiliary heat radiation fins that protrude from the fin portion of the heat sink, which is a component, and are developed and shaped into a shape with good ventilation to assist the heat radiation of the fins of the heat sink. Composite heat sink described in section. (4) It is configured by combining a plurality of first components and a single second component, and the plurality of heat sinks that are the first components have a predetermined number of heat receiving (or heating) heat sinks and a predetermined number of heat sinks. There are two types of heat sinks for heat dissipation (or cooling), the predetermined portions of which are press-fitted into the grooves of the plurality of first components, and the second heat sinks are integrally bonded with the fins forming the grooves. The remaining components are configured as high-temperature connecting capillaries and low-temperature connecting capillaries for exchanging high-temperature working fluid and low-temperature working fluid between the heat receiving (or heating) heat sink and the heat dissipating (or cooling) heat sink. A composite heat sink according to claim 1, characterized in that: (5) The second component, the serpentine loop-type capillary heat pipe, is bonded to the air-cooled heat dissipation part formed by the meandering of the capillary container and to the fins that are press-fitted into the grooves of the first component and form the grooves. Claim 1, characterized in that the three parts of the integrated heat receiving part, the high temperature connecting capillary tube and the low temperature connecting capillary tube that connect the heat receiving part and the heat radiating part are integrated to form a loop. Composite heat sink described in section.