JPH049594A - Radiation section of zigzag loop type small-sized heat pipe - Google Patents

Abstract

PURPOSE:To improve radiation capacity by disposing a group of tubular spacers across a group of small-sized tubes of the radiation section of a zigzag loop type heat pipes having layouts of square or triangular pattern, said groups being in contact with each other. CONSTITUTION:Zigzag loop type small-sized heat pipes 1-1, 1-n are parallelly laid out on triangular or square patterns, in which a part of them constitutes a heat receiving section H and most of the remainder constitutes a radiation section. A group of small-sized heat pipes 2-1, 2-n, as a spacer group, is positioned across the heat pipes 1-1, 1-n in contact with each other. Heat transmitted from the section H raises the temperature of the pipes 1-1, 1-n and said heat is transferred to the pipes 2-1, 2-n through the contact area, and the temperature of the pipes 2-1, 2-n are equalized over the entire length thereof, in which the pipes 2-1, 2-n function as fins for the pipes 1-1, 1-n, resulting thereby in expanded radiation area. Consequently, heat on the downstream side is transferred to the pipes having high radiation efficiency on the upstream side, resulting in greatly improved radiation efficiency of the radiation section as a whole.

Description

DETAILED DESCRIPTION OF THE INVENTION A66 Purpose of the Invention [Field of Industrial Application] The present invention relates to the structure of a heat pipe, and particularly to the structure of a heat dissipation section of a meandering loop type thin tube heat pipe.

[Conventional technology]

Since the heat dissipation section formed by the parallel capillary tubes in the meandering loop capillary heat pipe has a large convective heat transfer coefficient of each capillary, it is generally possible to exhibit a relatively good heat dissipation ability without installing a fin group. However, if the required performance is high, it is often required to install a group of radiation fins.

However, it is nearly impossible to attach a flat fin group to the heat dissipation section formed by a group of parallel thin tubes of a serpentine loop type thin tube heat pipe container. The reason is that the tube is too thin.
This was due to the fact that there were too many pipes, and a pair of thin tubes for reciprocating hydraulic fluid were connected at the turn. As a countermeasure against this, there are methods such as using a thin tube with spiral fins at the time of the raw tube, and forming needle-like or ribbon-like fins at the time of the raw tube. However, in such cases, it is necessary to remove the fins at the portions forming the heat-receiving section plane, the turn portions, etc., which is an extremely difficult task. The present inventor proposed Japanese Patent Application No. 1)62589 as a fin structure and manufacturing method thereof that facilitates the fin removal work. As shown in FIG. 6, its structure is a meandering structure in which a thin metal wire 12, which has been plated with a low-melting metal, is laterally wound around the outer periphery of a long thin tube which has been plated with a low-melting metal in advance to form a fin. A loop-type capillary heat pipe consisting of a loop-type capillary container 1), the turn portion 1)-4
It was extremely easy to bend the fins, and it was also easy to remove the fins in areas where fins were not needed, such as the heat receiving part 1)-1.

The fin structure was completed by fusion-bonding the fin structure with the capillary container by heating or immersing it in molten low-melting point metal after completing the molding of the heat dissipation part.

[Problem that the invention seeks to solve]

In the conventional fin structure provided in the heat dissipation section of a meandering loop type thin tube heat pipe, it is necessary to remove the fins at portions corresponding to the heat receiving section, turn section, etc., and this work is complicated and difficult. As a countermeasure, the fin structure according to Japanese Patent Application No. 1-162589, shown in Figure 6, can solve most of the problems, but the heat dissipation area expansion rate is 2.
The improvement in heat dissipation performance was about ~3 times that of the case where a flat plate type fin group was installed, and the improvement in heat radiation performance was insufficient.

Structure of the Invention [Means for Solving the Problems] The basic structure of the means for solving the problems according to the present invention is shown in FIG. The drawing shows all the constituting capillaries in diagram form for the sake of simplicity. Meandering loop type thin tube heat pipe 1-i,
A portion of the l-n parallel portion is configured as a heat receiving portion (broken line H), and most of the remaining portion is configured as a heat radiating portion. The thin tube groups constituting the heat dissipation section are arranged in a staggered or grid pattern, and in FIG. 1, the first row of thin tube groups is indicated by a solid line and is designated as 1-1. The groups of thin tubes from the second row onwards are collectively indicated by broken lines l-n for the sake of simplification of the drawing. Although the heat dissipation section illustrated in FIG. 1 is composed of a plurality of loop-type thin tube heat pipes, a group of thin tubes of a single loop-type thin tube heat pipe may be expanded and configured in a staggered arrangement or a checkerboard arrangement. . In order to maintain the arrangement of the tubes in a group of tubes arranged in a staggered or grid pattern at a constant distance and to ensure good passage of convective fluid, an appropriate soother is inserted between each tube. , needs to be fixed. 1st
In the figure, the tubular spacer group is inserted and inserted across the thin tube groups 1 to 1)-n, and the thin tube heat pipe group 2-1.2-n is applied as the spacer group. It is a characteristic. In the figure, a solid line indicates a group of capillary heat pipes 2-1 inserted between the first row of capillary tubes 1-1 and the second row of capillary tubes, and a group of capillary heat pipes inserted and connected between the second to nth rows. The thin tube heat pipe group shown in FIG. 1 is collectively shown as a broken line 2-n. These spacer groups are fixed in the meandering loop heat pipe thin tube group 1-1. Adhesion using thermally conductive adhesion means is preferable, although pressure clamping may be performed using ln elasticity. In the figure, arrow W indicates the flow direction of convection, and this flow direction may be perpendicular to the plane formed by the group of thin tubes, or parallel to the plane formed by the group of thin tubes.

[For production]

A thin tube heat pipe 2-1 which is a spacer in the heat dissipation part of the meandering loop type thin tube heat pipe configured as described above.
．． 2-n exhibits the following effects.

a. The amount of heat transported from the heat receiving section H is the heat dissipating section thin tube group 1-1.
．． The temperature of heat pipe 1-n is increased, and the heat pipe is transferred to a group of thin tube heat pipes 2-1.2-n, which are spacers, via a group of contact parts. The thin tube heat pipe group 21.2-n has the same temperature over its entire length due to the heat equalization effect of each. The thin tube heat pipe group 21.2-n is the thin tube group 1-1. of the meandering loop type thin tube heat pipe. Although the heat dissipation area is expanded as the fin group of l-n, the heat equalization effect that always maintains the same temperature over the entire length is maintained during heat dissipation, so the fins of the thin tube heat pipe group 2-1.2-n The fin efficiency of the group is 100%, greatly increasing the heat dissipation efficiency of the heat dissipation section.

b. When the multi-tube heat dissipation section of the thin tube group performs convective heat dissipation, the temperature of the convective fluid is increased by heat absorption every time it passes through each row. That is, in such a heat radiation part number, the heat radiation efficiency of the thin tubes on the upstream side where the number of rows is large decreases, and the temperature of the thin tubes becomes higher toward the downstream side. However, the heat dissipation section according to the present invention is the thin tube heat pipe group 2-1. Due to the heat equalization effect of 2-n, the amount of heat on the downstream side is transferred to the group of thin tubes in the upstream row, which has good heat radiation efficiency, and is radiated, thereby greatly improving the heat radiation efficiency of the entire heat radiating section.

〔Example〕

First Embodiment In this embodiment, a serpentine loop type thin tube heat pipe 3-13-n is used instead of the thin tube heat pipe group 2-1. It is characterized by The thin tube heat pipe 3-1.3-
n repeats meandering at a predetermined pitch on the same plane to form a group of parallel capillary tubes to form a group of capillary tubes in a meandering loop type capillary heat pipe 1). A spacer is inserted between the planes formed by 1-n. Multiple tube heat pipes 2-1.2-n
Instead, each loop is made of one thread, which makes it possible to significantly reduce the manufacturing cost and the time required for insertion and joining work.

Second Embodiment FIGS. 3, 4, and 5 are a side view, a front view, and a plan view, respectively, of this embodiment. The third embodiment is also shown in these figures.

Heat dissipation section of loop type capillary heat pipe capillary tube group 1). 1-2
．． l-n heat-radiates and cools the high-temperature working fluid propelled from the heat-receiving section, and returns the high-temperature working fluid to the heat-receiving section as a low-temperature working fluid.

Therefore, as illustrated in FIG.
It can be considered separately into low-temperature capillary tubes 1-1-C, 1-2-C, and 1-n-C. Since the working fluid circulating inside these is a two-phase fluid, the higher the temperature, the richer the gas phase, and the lower the temperature, the richer the liquid phase. Further, the pressure difference between the saturated vapor pressure in the gas phase lynch section and the saturated vapor pressure in the liquid phase rich section serves as a driving force for the working fluid. Further, the pressure loss of the fluid in the pipe is larger in the liquid phase rich portion than in the gas phase lynch portion in inverse proportion to the volume of the gas phase.

Therefore, as in the basic structure (Fig. 1) and the first embodiment (Fig. 2), the spacers such as the thin tubes P1-Byph 2-12-n and 3-1.3-n are arranged randomly. In some cases, there are many parts where heat exchange occurs between the high-temperature capillary and the low-temperature capillary, and liquid phase-rich parts occur within the many high-temperature capillaries. In such cases, there is no change in the overall heat dissipation efficiency of the heat dissipation section as a whole, but if the amount of heat received in the heat receiving section is small, the hydraulic fluid driving force is small, or the heat dissipation section is long, the hydraulic fluid circulation may be difficult.

In other words, the generation of a moderately cooled portion in a portion of the loop may deteriorate the sensitivity of the meandering loop thin tube heat pipe. The second embodiment prevents such a situation from occurring. In FIGS. 3, 4, and 5, a capillary heat pipe 2-1.2-2 and a low-temperature capillary 1-1-C are spacers between the high-temperature capillary 1-1-H and the high-temperature capillary 1-2-H.
The thin tube heat pipe 2-6.2-n, which is a spacer between the low-temperature thin tube 1-2-C and the thin tube 1-1-8.1-2-H and 1-1 that sandwich them, respectively. -C12-C and are integrated by soldering. However, the capillary heat pipe 2-3.2-4.2-5, which is a Q spacer between the high-temperature capillary 1-2-H and the low-temperature capillary 1-1-C, is either the high-temperature capillary 1-2-H or the low-temperature capillary 1-. It is characterized in that it is integrated with one of the thin tubes 1-C by soldering, but is thermally insulated from the other thin tube. In the figure, low temperature capillary 1-1-C
There is a heat insulating material 4 between the heat pipe 13.2-4.25 and the capillary heat pipe 13.2-4.25. 4-2. 4-n is interposed. 4
1.42.4-n is not limited to sandwiching a heat insulating material, but may be connected using a non-thermal conductive adhesive.

Also, in some cases, the cotton heat pipe 2- which is a spacer
3°2-4.2-5 may be replaced with a tubular body or columnar body made of a material with poor thermal conductivity.

In the heat dissipation section according to the second embodiment configured in this way, the high temperature tube group and its spacer group are kept as high as possible, and the low temperature tube group and its spacer group are kept as low as possible. Therefore, even if the temperature difference between the heat receiving and radiating parts is small and the heating temperature for the heat receiving part is low, good heat radiating efficiency can be exhibited without causing partial cooling.

Third Embodiment A third embodiment shown in FIGS. 3, 4, and 5 is a parallel capillary group 1-1 of a meandering loop capillary heat pipe.
1-2. 1-3. 1-n and the group of thin tube heat pipes 2-1.22.2-3.2-n which are their spacers, or both of them have either an elliptical cross section or a rectangular cross section. They are formed in this shape and are characterized in that their mutually soldered parts are combined to provide the largest possible contact area. As a result, tubule group 1-], 1-2. 1-n and thin tube heat pipe group 2-1. 2-2. 2-n becomes good, and the thin tube heat pipe group 21.2-2 which is a spacer
．． The effect of 2-n is effectively exhibited.

C1 Effects of the Invention The heat dissipation portion of the meandering loop-shaped thin tube heat pipe according to the present invention can easily be provided with good heat dissipation ability as well as by attaching a group of fins by the simple means of inserting a thin tube heat pipe as a spacer. Due to the heat equalization effect of the group of thin tube heat pipes, it is possible to construct a heat dissipation section with little performance deterioration even if the heat pipes are arranged in multiple stages and in multiple rows.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the basic structure of a heat dissipation section of a meandering loop type inter-assembly heat pipe according to the present invention. FIG. 2 is a schematic diagram showing the structure of a first embodiment of the present invention. FIG. 3 is a side view of the second and third embodiments of the present invention, FIG. 4 is a front view of the second and third embodiments of the present invention, and FIG. 5 is a side view of the second and third embodiments of the present invention. FIG. 6 is a schematic diagram showing the structure of a conventional example of a heat dissipation part of a meandering loop type thin tube heat pipe. 1-1.1-2.1-n...Thin tube group of meandering loop type thin tube heat pipe, 2-1.2 to 2. ...2-〇...
Thin tube heat pipe group, 3-1.3-n... Thin tube group of meandering loop type thin tube heat pipe, 1 to 1-H91-2-H
...High temperature capillary, 1-1-C, 1-2-C...Low temperature capillary, 4-1.4-2. ...4~n...Insulating material, 1)
...Low melting point metal Menki loop type thin tube container, 12.
...Low melting point metal plated metal wire. Figure (1 o'clock, food and clothing right JAru) Figure (Chapter 2 to 3 Treasure offing the 1ill) Figure (Non 2 counting 3 乍 Administrative and decoy 12) /-3 (3-n ゝ1 Wa diagram (high + 'y permutation) Happy diagram ('j' + 2' V, 3 f W E・l Y Ml
) chart < s (h example le run)

Claims (4)

[Claims] (1) A thin tube container of a long loop-type thin tube heat pipe repeats turns every predetermined length to form a group of parallel thin tubes, and a part of the length is aligned to form a heat receiving part, A heat radiating section of a meandering loop type thin tube heat pipe in which a predetermined portion of the remaining portion is configured as a multi-tube type heat radiating section in a multi-stage, multi-row staggered arrangement or a checkerboard arrangement, wherein the group of thin tubes is arranged in a staggered arrangement or a checkerboard arrangement. The structure of the rows in the grid arrangement is such that the distance between each tube is determined by a group of tubular spacers inserted between the tubes so as to intersect with the group of tubes, and most of the group of tubular spacers are arranged between the tubes. A device characterized by being a heat pipe. (2) The heat dissipation part of the meandering loop type capillary heat pipe has a composite structure in which a predetermined number of sub meandering loop type capillary heat pipes are cross-connected to the heat dissipation part of the main meandering loop type capillary heat pipe. The group of thin tubes constituting the heat radiating section of the main serpentine loop type thin tube heat pipe is arranged in a staggered arrangement or a grid arrangement, and the tubular spacer group that determines the distance between the rows is as follows: Most of the heat pipes use the parallel parts of a group of thin tubes in the secondary serpentine loop type thin tube heat pipe. The heat dissipation section of the meandering loop-type thin tube heat pipe according to claim 1, wherein the heat dissipation section is a heat dissipation section. (3) A spacer sandwiched between the high temperature side parallel tubes and the high temperature side parallel tubes at the contact area where each of the thin tube heat pipes serving as a spacer and each of the parallel thin tubes of the meandering loop type thin tube heat pipe intersect with each other. The thin tube heat pipe and spacer sandwiched between the low temperature side parallel tube and the low temperature side parallel tube are integrated by soldering with the parallel thin tube sandwiching them, and are integrated with the high temperature side parallel tube. Claims characterized in that the spacer thin tube heat pipe sandwiched between the parallel thin tubes on the low temperature side is thermally insulated from either one of the parallel thin tubes sandwiching them. A heat dissipation part of the meandering loop type capillary heat pipe according to item 1. (4) One or both of the thin tube container of the serpentine loop type thin tube heat pipe and the thin tube container of the thin tube heat pipe that is a spacer is formed into a cross-sectional shape of either an elliptical cross section or a rectangular cross section. , the heat dissipation section of the meandering loop type capillary heat pipe according to claim 1, characterized in that their mutually soldered portions are combined so as to have as large a contact area as possible.