JPH10281671A - Joint structure body of thin rectangular planar heat-pipe module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an elongation of a thin rectangular planar heat pipe by making the thin rectangular planar heat pipe which is constructed by arranging a group of small-diameter pipes in zigzag or a thin rectangular planar heat pipe which is constructed by providing a zigzag small-diameter heat pipe like a thin-diameter tunnel have a joint structur of unit modules. SOLUTION: In a joint structural body formed by joining it modules 1, 2 of a thin rectangular planar heat pipe which is constructed by arranging a group of small-diameter pies in zigzag or formed by joining unit module 1, 2 of thin rectangular planar heat pipe which is constructed by providing a zigzag small-diameter heat pipe like a thin-diameter tunnel, the join structural body are constructed by overlapping end portions of a plurality of unit modules 1, 2 of the thin rectangular heat pipe having a given length in sequence and thermally connecting them. Here, the length of the thin rectangular planar unit modules 1, 2 is determined such than a given amount of heat input can be thermally transferred at an optimum heat transfer efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a meandering thin-tube heat pipe and a connection structure of the heat pipe applied thereto, and more particularly, to a thin flat plate formed by aligning thin-tube groups of a meandering thin-tube heat pipe. Modified thin flat plate structure in which a meandering thin-tube heat pipe is formed into a thin-diameter tunnel and built in a long thin flat plate structure or a thin metal flat plate. The present invention relates to a novel structure that enables a plate-shaped heat pipe to be lengthened by being formed into a body and that greatly reduces performance degradation due to the heat transport distance.

[0002]

2. Description of the Related Art The meandering thin-tube heat pipe technology and its applied products are new technologies and new products which have just been developed, and the connection technology and connection structure for lengthening are new technologies and structures which are not at all available in the world. is there. Therefore, there is no example in the related art, and it is impossible to explain the cited reference. There is no practical example of the connection structure in the heat pipe of the conventional structure, but various inventions are proposed at the level of application and proposal. However, the heat pipe having the conventional structure and the meandering thin tube heat pipe have completely different operating principles and operating modes, and have completely different purposes for adopting the connection structure, so that they cannot be compared on the same ring.

[0003] Fig. 5 shows an example of a connection structure for elongating a cylindrical heat pipe having a conventional structure at the application level. In the figure, 11 is a heat supply side heat pipe, 12 is a heat reception side heat pipe, and 13 is a heat pipe for heat connection.
Reference numeral 13 denotes a hollow tubular heat pipe, which press-fits the ends of the supply-side and reception-side heat pipes 11 and 12 into the hollow portion and butt-connects them. Although this connection structure was a highly practical structure, as can be seen from the figure, the heat resistance for supplying heat from the heat supply side heat pipe 11 to the connection heat pipe 13, the internal heat resistance of the heat pipe 13, the connection heat pipe 13
The total thermal resistance of the three stages of thermal resistance for supplying heat to the heat receiving side heat pipe 12 is extremely high, and has not been put to practical use due to a large temperature drop. In addition, this heat pipe is cylindrical, and it is difficult to reduce the diameter and the capacity of the heat pipe, and the connection heat pipe 13 is increased in size. In addition, when the conventional cylindrical heat pipe is extended to have a longer length, there is no characteristic such that the heat transport performance is sharply and drastically reduced at a certain limit length as in a meandering thin tube heat pipe, and the performance gradually decreases. And has a long limit length. In this regard, the heat pipe has characteristics completely different from those of the meandering thin tube heat pipe, and the purpose of the connection structure is also different. The meandering thin-tube heat pipe to which the present invention is applied is thinned and reduced in size to a thickness of 2 mm or less, and can be freely bent for use. Pipes do not have such an application at all and cannot be referred to in terms of completely different areas of application.

[0004]

SUMMARY OF THE INVENTION A meandering thin tube heat pipe in which a thin tube repeats reciprocating meandering between a heat receiving portion and a heat radiating portion is sealed by the heat energy absorbed by the thin tube group of the heat receiving portion. Hydraulic fluid generates nucleate boiling in the narrow tube group, and the pressure wave causes the hydraulic fluid to generate axial reciprocating vibration in all parts of the narrow tube, and this action increases the amount of heat from the heat receiving part to the heat radiating part. Transport to Since the operating principle of the meandering thin-tube heat pipe is as described above, the inherent dependence of the hydraulic fluid energy on the distance due to the pressure loss in the thin tube cannot be avoided. Therefore, in the meandering thin tube heat pipe, when the inner diameter of the thin tube is 4 mm, the distance between the heat receiving portion and the heat radiating portion is several meters, and when the inner diameter of the thin tube is 3 mm, the distance between the heat receiving portion and the heat radiating portion is very good even when the distance is 2 meters. It is possible to transport heat, but as the inside diameter of the thin tube becomes smaller, the practical heat-transportable distance is sharply shortened, making it impossible to increase the length.

[0005] The meandering thin tube heat pipe is designed so that the nucleate boiling pressure wave of the heat receiving portion in each of the thin tube groups is one.
It is designed to have sufficient energy so that the enclosed hydraulic fluid in the book generates an axial vibration over the entire length of each one. Each of the surplus energy is compressed and stored in the steam bubbles of the working fluid as energy to assist the axial vibration of the working fluid in the other capillary tubes. The energy mutual complementarity of each capillary generated in this way is such that the more the number of meandering turns is increased in the meandering capillary heat pipe, the more the heat transfer capacity increases at a rate much higher than the rate of increase in the number of turns. This gives the meandering thin-tube heat pipe a unique function that gives such excellent characteristics and that the greater the number of turns, the more the gravity independence, that is, the operability in the top heat mode is greatly improved. . Since the excellent characteristics of the meandering thin tube heat pipe are given as described above, on the other hand, the length of the meandering thin tube heat pipe is too long in design, and one nucleate boiling energy is generated in each of the tubes. If the liquid is not sufficiently vibrated in the axial direction over the entire length of each liquid, the mutual complementarity between the above-mentioned groups of thin tubes is lost in all the thin tubes at once, so that the heat transfer performance of the meandering thin tube heat pipe is reduced. Is given a negative characteristic, which is that if the length exceeds a certain length as a limit, the length suddenly and extremely deteriorates.

For the reasons described above, the meandering thin-tube heat pipe has a significantly reduced inner diameter such as 1 mm or less, and if its length exceeds the operable limit length, the heat transport performance is extremely deteriorated. In an extreme case, there is an inherent negative property that the operation is suddenly stopped. 2. Description of the Related Art In recent years, as technology for miniaturization of devices and high-density mounting has progressed, thinner flat plate heat pipes have been strictly required, and the thickness thereof has been required to be 2 mm or less. . For this purpose, the inner diameter of the meandering thin tube heat pipe and the meandering small diameter tunnel plate heat pipe is 1 m.
m or less. In that case, the design length of those flat heat pipes often exceeds the length limit as described above, and the situation where the heat transport capacity is extremely short of the designed capacity is increasing. This point has become a major problem, and measures for it are required. FIG. 4 is a line graph showing experimental measurement values of the relationship between the length of the tunnel plate heat pipe having a tunnel inner diameter of 0.9 mm, the number of meandering turns of 40, the plate width of 50 mm, and the plate thickness of 1.9 mm and the maximum heat transport amount. It can be seen that in the case of such a plate heat pipe with a built-in small-diameter tunnel, when the length is 300 mm or more, the heat transport capacity is sharply reduced.

[0007]

[Means for Solving the Problems] Considering the causes of the problems described in the preceding paragraph, the means for solving the problems is such that the heat transport performance does not exceed the limit length at which the heat transport performance drops extremely sharply. It can be seen that the plurality of flat heat pipes are connected to each other by means having a small joining thermal resistance to form a connection structure having a desired length based on the total length. The present invention is a connection structure for that purpose, and its basic structure described in the perspective view of FIG. 1 is as follows.

The meandering thin-tube heat pipe is formed into a thin rectangular plate-shaped heat pipe unit module or a metal flat plate in which the thin tube groups of the meandering thin-tube heat pipe are aligned to form a small-diameter tunnel. In the connection structure of the unit module of the thin rectangular flat plate heat pipe configured to be built-in, the connection structure is formed of a plurality of unit modules 1 and 2 of the thin rectangular flat plate heat pipe having a predetermined length. A terminal body of each unit module is sequentially superimposed on each other by a predetermined means, is thermally connected, is configured to be extended and configured, and is an elongated structure,
The lengths of the thin rectangular flat plate unit modules 1 and 2 are the equivalent diameter of the inner diameter of the meandering thin tube reciprocating between both ends of the module, the number of meandering turns of the meandering thin tube, and the pressure in the thin tube at the operating temperature of the enclosed hydraulic fluid. When a predetermined amount of heat input is determined to be heat transported with as high a heat transport efficiency as possible in consideration of the loss, and the length of the modules 1 and 2 exceeds a certain length. If the fixed length inherent to the thin flat plate structure of the meandering thin-tube heat pipe where the rapid decrease in heat transfer efficiency starts to occur is the limit length, it is a length that does not reach the limit length, and is a thin rectangular flat plate In the form of a thermal connection formed by stacking the unit modules of a heat pipe, the connection length is such that if the area of the connection is smaller than the critical area, it is impossible to transport more than a predetermined amount of transport heat. Thin rectangle of pipe The length of the connection portion, which is a property inherent to the plate-like structure and does not become smaller than the critical area, is used as the heat connection structure of the overlapped heat connection portion 3 by a pressurized connection by a predetermined means and a heat-conductive grease. It is characterized in that it is formed as a low-loss heat connection structure by any one of pressure connection, brazing connection, and adhesive connection. In this connection structure, the number of connected unit modules is not limited to two, ie, the heat supply side unit module 1 and the heat amount reception side unit module 2, and a large number of units may be connected sequentially.
Also, the connection structure may be formed at a number of places.

[0009]

In the case of such a configuration, the unit module 1,
2 is, for example, a small diameter such as a tunnel inner diameter of 0.9 mm and a thin shape such as 40 turns, a module width of 50 mm, and a module thickness of 1.9 mm. In other words, if the length of the unit module is 300 mm or less, it means that each unit module is a module capable of guaranteeing the maximum heat transfer amount of 200 W or more. Also, it is experimentally possible that the lap joint can be joined without deteriorating the heat transport performance even with a thermal connection of 200 W if the area of the thermal joint 3 is 50 mm ² or more, that is, 50 mm in width and 100 mm in length. It is clear. Further, the thermal resistance of the lap joint is 0.01 ° C./W or less even for an adhesive joint having a relatively large thermal resistance, that is, a temperature drop of 2 ° C.
It is empirically known that:

As described above, in the case of this example estimated from FIG. 4, the connecting structure of the thin rectangular flat heat pipe module having the basic structure of the present invention has a total length of 5 mm.
It can be seen that heat transport of 200 W is possible even with a length of 00 mm. It is clear that the conventional heat transport performance of such a flat heat pipe having a long, meandering small-diameter tunnel built therein has a length exceeding a limit length.
Could be transported. In the case of implementing the structure of the present invention, the unit module of the flat heat pipe with a built-in meandering small diameter tunnel having a tunnel inner diameter of 2 mm, a module width of 100 mm, and a module thickness of 3 mm is 1 m or more, and the connection structure is It is possible to construct a length of 2 m and its maximum heat transport is expected to exceed 2 KW. The production of such a flat heat pipe has heretofore been impossible at all.

[0011]

【Example】

First Embodiment FIG. 2 shows an example of an application embodiment of the connection structure of the present invention. In this embodiment, the form of the overlapped connection portion is such that one end of the heat supply unit module 1 and one end of the heat reception unit module 2 are abutted, and the heat supply unit module 1 and the heat reception side of the butted portion are joined. It is characterized in that the connection unit modules 4-1 and 4-2 are overlaid and bonded by predetermined means on both sides of the unit module 2 and on both sides thereof. In the case of this connection structure, the bonding area of the heat connection portion 3 can be increased to 3-1, 3-2, 3-3, and 3-4, so that the maximum heat transport amount passing through the heat connection portion 3 is greatly increased. Can be increased. Also, the heat supply side unit module 1
Since the heat quantity is taken out from both sides of the unit module 2 and the heat quantity is transmitted from both sides of the heat receiving unit module 2, the heat connection efficiency is also doubled as compared with the basic structure.

The structure of the first embodiment is similar to the connection structure of the conventional cylindrical heat pipe of FIG. 5, but is completely different in function. Since each of the connection unit modules 4 of this embodiment is a module with a built-in meandering small-diameter tunnel, it can be formed sufficiently thin and can provide sufficient flexibility. Since there is no fear, it is possible to connect with a very small thermal resistance because a pressurized connection can be made with a large pressing force, and a connection area with a very small heat resistance can be made because the contact area can be made wider than in the case of a cylinder It is completely different from the connection structure of the conventional cylindrical heat pipe from the point of becoming.

[Second Embodiment] FIG. 3 shows another example of an application embodiment of the connection structure of the present invention. In this embodiment, the calorie supply unit module 1 is composed of one unit module, and the calorie supply unit module 2 is a laminated structure of two unit modules 2-1 and 2-2. As the form structure of the heat receiving side unit module 2
At one end, the adhesive of the laminated structure is released, and a heat connection gap 5 corresponding to the thickness of the heat supply unit module 1 is provided.
Is press-fitted and then formed into a predetermined thermal connection structure.

The features of this embodiment are that the connection structure is simplified, and that the heat receiving side unit modules 2 are 2-1 and 2-2.
The basic structure and the first embodiment in that the heat receiving side unit module 2 has a small thermal resistance and the heat receiving side unit module 2 can be made longer than the heat supplying side unit module 1 by having the laminated structure of Better.
It is the same as the first embodiment in that it is basically different from the connection structure of the conventional cylindrical heat pipe and is superior to the connection structure of the cylindrical heat pipe.

[0015]

According to the present invention, a thin rectangular flat plate heat pipe or a thin metal plate having a meandering thin tube heat pipe in which the thin tube groups of the meandering thin tube heat pipe are arranged in a thin flat plate shape. The thin rectangular plate-shaped heat pipe, which is constructed by being built into a small-diameter tunnel and built in, can be made longer by adopting the connection structure of the unit modules, and the longer connection becomes possible. The heat transport capacity of the structure was improved by a factor of 10 as compared to the integral long body of the unconnected structure. The lengthening of such a thin rectangular flat heat pipe and the strengthening of its heat transport capability meet the strong demands of the recent industry, and greatly contribute to the miniaturization and weight reduction of equipment mounting. Is believed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a basic structure of a connection structure of a thin rectangular flat heat pipe module of the present invention.

FIG. 2 is a perspective view showing a first embodiment of a connection structure of a thin rectangular flat heat pipe module of the present invention.

FIG. 3 is a perspective view showing a second embodiment of the connection structure of the thin rectangular flat heat pipe module of the present invention.

FIG. 4 is a line graph showing the relationship between the length of a flat unit module and the maximum heat transport amount.

FIG. 5 is a sectional view showing an example of a connection structure of a conventional cylindrical heat pipe.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 Heat supply side unit module 2 Heat reception side unit module 2-1 Heat reception side unit module 2-2 Heat reception side unit module 3 Heat connection section 3-1 Heat connection section 3-2 Heat connection section 3-3 Heat connection section 3-4 Thermal connection part 4-1 Connection unit module 4-2 Connection unit module 5 Heat connection gap 11 Heat supply side heat pipe 12 Heat reception side heat pipe 13 Heat connection heat pipe

[Procedure amendment]

[Submission date] April 8, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

The meandering thin-tube heat pipe is formed into a thin rectangular plate-shaped heat pipe unit module or a metal flat plate in which the thin tube groups of the meandering thin-tube heat pipe are aligned to form a small-diameter tunnel. In the connection structure of the unit module of the thin rectangular flat plate heat pipe configured to be built-in, the connection structure is formed of a plurality of unit modules 1 and 2 of the thin rectangular flat plate heat pipe having a predetermined length. A terminal body of each unit module is sequentially superimposed on each other by a predetermined means, is thermally connected, is configured to be extended and configured, and is an elongated structure,
The lengths of the thin rectangular flat plate unit modules 1 and 2 are the equivalent diameter of the inner diameter of the meandering thin tube reciprocating between both ends of the module, the number of meandering turns of the meandering thin tube, and the pressure in the thin tube at the operating temperature of the enclosed hydraulic fluid. When a predetermined amount of heat input is determined to be heat transported with as high a heat transport efficiency as possible in consideration of the loss, and the length of the modules 1 and 2 exceeds a certain length. If the fixed length inherent to the thin flat plate structure of the meandering thin-tube heat pipe where the rapid decrease in heat transfer efficiency starts to occur is the limit length, it is a length that does not reach the limit length, and is a thin rectangular flat plate In the form of a thermal connection formed by stacking the unit modules of a heat pipe, the connection length is such that if the area of the connection is smaller than the critical area, it is impossible to transport more than a predetermined amount of transport heat. Thin rectangle of pipe The length of the connection portion, which is a property inherent to the plate-like structure and does not become smaller than the critical area, is used as the heat connection structure of the overlapped heat connection portion 3 by a pressurized connection by a predetermined means and a heat-conductive grease. It is characterized in that it is formed as a low-loss heat connection structure by any one of pressure connection, brazing connection, and adhesive connection. In this connection structure, the number of connected unit modules is not limited to two, ie, the heat supply side unit module 1 and the heat amount reception side unit module 2, and a large number of units may be connected sequentially.
Also, the connection structure may be formed at a number of places.
In other words, the connection structure part is also received at multiple locations in the unit module.
This connection structure should be a multi-branch connection structure
Can be supplied from multiple heat supply modules
Collective delivery of heat to a single heat receiving module
Also the amount of heat supplied from a single calorie supply module
Can be distributed to multiple heat receiving modules
become.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

As described above, in the case of this example estimated from FIG. 4, the connecting structure of the thin rectangular flat heat pipe module having the basic structure of the present invention has a total length of 5 mm.
It can be seen that heat transport of 200 W is possible even with a length of 00 mm. It is clear that the conventional heat transport performance of such a flat heat pipe having a long, meandering small-diameter tunnel built therein has a length exceeding a limit length.
Could be transported. In the case of implementing the structure of the present invention, the unit module of the flat heat pipe with a built-in meandering small diameter tunnel having a tunnel inner diameter of 2 mm, a module width of 100 mm, and a module thickness of 3 mm is 1 m or more, and the connection structure is It is possible to construct a length of 2 m and its maximum heat transport is expected to exceed 2 KW. The production of such a flat heat pipe has heretofore been impossible at all. Also
Long rectangular plate by applying the structure of the present invention
Heat pipes simply constitute a longitudinal connection structure
It is not limited to only, branch type long rectangular plate heat pipe
And multiple rectangular plate heat pipes
Join at the edges or use multiple rectangular plate heaters
The top pipe is made into a structure with a branch at one end
It is also possible to apply to doing.

Claims (3)

[Claims] 1. A meandering thin tube heat pipe is formed into a thin rectangular flat plate heat pipe unit module or metal flat plate in which thin tube groups of meandering thin tube heat pipes are aligned to form a small diameter tunnel. In a connection structure of a unit module of a thin rectangular flat heat pipe configured to be built-in at least, the connection structure is a unit of a plurality of unit thin rectangular flat heat pipe modules having a predetermined length. A terminal structure of the module is formed by elongating the terminal portions of the module by successively overlapping and thermally connecting them by a predetermined means, and the length of the unit module is a thin rectangular flat plate. Equivalent diameter of the inner diameter of the meandering thin tube reciprocating meandering, the number of meandering turns of the meandering thin tube, pressure loss in the thin tube at the operating temperature of the enclosed working fluid,
The length of the unit module is determined so that a predetermined amount of heat input is transferred with as high a heat transfer efficiency as possible, and the length of the unit module exceeds a certain length. If the fixed length inherent to the thin flat plate structure of the meandering thin-tube heat pipe is considered to be the limit length when the heat transfer efficiency suddenly starts to decrease, the length does not reach the limit length. As the form structure of the rectangular flat plate unit module superimposed thermal connection portion, the connection length is such that when the connection portion area is smaller than the limit area, transport of a predetermined amount of transport heat or more is impossible, and the thin, meandering thin tube heat pipe is not provided. The length of the connection portion, which is a property inherent in the rectangular flat plate-shaped structure and does not become smaller than the critical area, the heat connection structure of the overlapped heat connection portion is a pressurized connection by a predetermined means and a heat-conductive grease. Pressure connection,
A connection structure for a thin rectangular flat heat pipe module, wherein the connection structure is formed as a low-loss heat connection structure by one of a brazing connection and an adhesive connection. 2. The form structure of the superimposed thermal connection portion is such that one end of the heat amount supply side unit module and one end of the heat amount reception side unit module are abutted, and the heat amount supply side unit module and the heat amount reception side unit module of the butted portion. 2. The connection of the thin rectangular flat plate-like heat pipe module according to claim 1, wherein the connection unit modules are overlaid and bonded by predetermined means on both sides thereof and on both sides thereof. Structure. 3. The heat supply side unit module is composed of one unit module, and the heat supply side unit module has a laminated structure of two unit modules. At one end of the unit module, a gap corresponding to the thickness of the calorie supply unit module is provided by releasing the adhesion of the laminated structure, and one end of the calorie supply unit module is press-fitted into this gap,
The connection structure for a thin rectangular flat heat pipe module according to claim 1, wherein the connection structure is formed into a predetermined heat connection structure thereafter.