JPH06213584A - Plate state heat pipe - Google Patents

Abstract

PURPOSE:To realize a heat controlling with a high reliability and for a long interval in a temperature region of a wide range from a low temperature region to a middle or a high temperature region. CONSTITUTION:There are a plurality of straight tube state pipe pathes wherein metallic flat plates 12 are parallelly arranged and are nipped by two loop type heat pipes 11, 11 with a zigzag type and in which an action liquid is enclosed. These loop type heat pipes 11, 11 that nip this metallic flat plate 12 are accommodated in a metallic closure vessel 10 and in an excessive space of this metallic closure vessel 10, the action liquid is enclosed. By this, a sufficient junction area of the loop type heat pipes 11, 11 can be obtained and a junction strength can be raised and therefore a heat controlling with high reliability becomes possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate heat pipe suitable for controlling heat of a heating element such as a power amplifier provided in an antenna system.

[0002]

2. Description of the Related Art This type of plate heat pipe is shown in FIG.
As shown in FIG. 3, the heating element 2 is mounted on one surface of the flat metal closed container 1 in which the heat pipe is housed, and the heat dissipation portion 3 provided with fins and the like is formed on the other surface. Then, when the heat amount of the heat generating element is added, the heat amount is dispersed, and the heat amount is radiated from the heat radiating portion so that the entire container is soaked, so that the heat generating element 2 is thermally controlled to a desired temperature.

By the way, in such a plate heat pipe, when a predetermined amount of working fluid is sealed in the pipe and heat is received from the heating element 2, the working fluid in the pipe vibrates and the amount of heat is activated. It is dispersed in the pipe through the liquid, and the temperature of the entire pipe is soaked that the well-known heat pipe system that controls heat is used to soak the entire plate and Perform thermal control.

FIG. 5 shows such a conventional plate heat pipe. In the metal closed container 1, for example, a lid body 1b is attached to a container body 1a provided with a concave accommodating portion and sealed. It is formed. That is, in the container body 1a, two loop-type heat pipes 4 in which a predetermined amount of the working fluid such as the HCFC 142b is enclosed in the housing portion.
After being stored, the lid 1b is attached, and a predetermined amount of hydraulic fluid is sealed in the surplus space inside.

The loop-type heat pipe is formed in a meandering structure having a plurality of meandering portions, and two straight pipe pipes 4a of the meandering portions are combined so as to be substantially orthogonal to each other, and intersections are formed. It is joined by brazing. Further, the loop heat pipe is joined to the bottom wall surface of the container body 1a of the metal closed container 1 and the inner wall surface of the lid 1b by brazing or the like while being housed in the metal closed container.

In the above structure, when the amount of heat from the heating element 2 is received by the metal closed container 1, the amount of heat is transferred to the loop type heat pipe 4 and the amount of heat is dispersed in four directions by the action of the loop type heat pipe 4. Is transmitted to the entire metal closed container 1. At the same time, the metal sealed container 1 promotes the dispersion of the amount of heat by the action of the working liquid inside the metal closed container 1 and the tube wall of the loop heat pipe 4, so that the entire temperature is equalized. at the same time,
The metal hermetically sealed container 1 radiates a quantity of heat from the heat dissipating portion, and the entire container is kept at a predetermined temperature.

However, in the above plate heat pipe, when thermal control is executed in a temperature range of, for example, about -30 ° C to + 130 ° C, contraction and thermal expansion occur with the temperature cycle, and the temperature cycle is dealt with. Internal pressure due to saturated vapor pressure is 0.4 kgf / cm ² ~ 4
0 kgf / cm ² Due to the withstand voltage structure, there is a concern in terms of reliability of operation control in realizing highly accurate thermal control for a long period of time due to the alternating load.

[0008]

As described above, in the conventional plate heat pipe, the thermal control of the temperature cycle from the low temperature region to the high temperature region is carried out for a long period of time, and it is satisfactory in terms of reliability. It has the problem that it is out of the question.

The present invention has been made in view of the above circumstances, and can realize highly reliable thermal control for a long period of time in a wide temperature range from a low temperature range to an intermediate high temperature range with a simple structure. An object of the present invention is to provide a plate heat pipe.

[0010]

SUMMARY OF THE INVENTION According to the present invention, a plurality of heat pipe groups having a plurality of straight tubular pipe paths arranged in parallel, each containing a predetermined amount of hydraulic fluid, and a plurality of the heat pipes. A heat pipe group, wherein the heat pipe group is joined to a sandwiching surface, and a metal flat plate sandwiched by the plurality of heat pipe groups is housed. Which is joined to the inner wall surface, and a plate heat pipe is provided with a metal airtight container in which a predetermined amount of hydraulic fluid is enclosed inside a heat receiving portion and a heat radiating portion provided on the outer wall surface. Is.

[0011]

According to the above construction, the heat pipe group sandwiching the metal flat plates has its entire length joined to the metal flat plates, whereby a sufficient joining area can be obtained and the joining strength can be enhanced. As a result, the pressure resistance of the entire metal pipe including the heat pipe group is improved, and it is possible to withstand the contraction and thermal expansion due to the temperature cycle having a wide temperature range, and the saturated vapor pressure of the working fluid, and the wide temperature range. Reliable thermal control of the area over a long period of time is possible.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a plate heat pipe according to an embodiment of the present invention. A closed container 10 is composed of a container body 10a and a lid 10b. Then, a concave housing portion 10c is formed in the container body, and in this housing portion, for example, two loop-types in which a metal flat plate 12 formed of a metal plate material such as copper having excellent heat conduction characteristics is sandwiched. The heat pipes 11, 11 are housed. The loop-type heat pipes 11 and 11 are formed in a meandering structure having a plurality of meandering meanders, for example, and are arranged in combination so that the straight pipe paths 11a and 11a of the meandering parts of the meandering structure are substantially orthogonal to each other. In this state, so-called line joining is directly performed on the metal flat plate 12 by brazing or the like. As a result, the two loop heat pipes 11 and 11 can disperse heat uniformly over the entire metal sealed container 10.

The above two loop type heat pipes 11 and 1
1 is wire-bonded to the bottom wall surface of the container body 10a or the inner wall surface of the lid 10b by brazing or the like. As a result, the two loop heat pipes 11 and 11 are connected to the metal closed container 1
In the state of being housed in 0, a sufficient bonding area between them can be obtained, the robust bonding strength can be obtained, and it is set to a high withstand voltage characteristic compatible type.

The metal flat plate 12 is, for example, the container body 1.
The shape is similar to the shape of the accommodating portion of 0a, and the diameter is slightly smaller. As a result, a space is formed between the housing portion 10c of the closed container body 10a and the peripheral portion of the metal flat plate 12 in a state of being partitioned by the metal flat plate 12, and this space is an extra space on both sides of the metal flat plate 12. And the working liquid enclosed in the metal closed container 10 can move to the excess spaces on both sides of the metal flat plate 12. As a result, the heat resistance of heat exchange when the flat metal plate 12 is inserted into the metal closed container 10 is reduced, and the entire metal closed container 10 functions as a heat pipe.

The effect of the metal flat plate 12 is confirmed experimentally. That is, two loop heat pipes 11, 11 having an outer diameter of 3 mm, a meandering number of 51, and a length of the meandering straight pipe paths 10a, 10a of 310 mm are formed.
1.0m thickness between two loop type heat pipes 11, 11
A metal flat plate 12 of m was interposed. And this metal flat plate 1
The two loop heat pipes 11 and 11 with the two interposed therein are housed in a metal closed container 10 having a thickness of 9.5 mm and an outer dimension of 350 mm × 350 mm with a metal material having a thickness of 1.5 mm. As shown in FIG.
As shown in, a 120 mm disk-shaped heater 13 is installed as a heating element, and the heat radiation portion on the other surface has an outer dimension of 150 mm.
A heating / cooling cycle test was performed by disposing two fins 14 of 14 mm × 300 mm. The condition is that heat input is applied every 2 hours, the heat receiving part temperature is maintained at a predetermined temperature for 1 hour, then the heat input is stopped and the heat receiving part temperature is cooled to the ambient temperature. Was carried out at 25 ° C. As a result, the initial heat resistance value of the heat-receiving part holding temperature of the metal closed container 10 of 100 ° C 0.0293 ° C / W The heat resistance value after 100 times of the cycle test 0.0292 ° C / W The heat reception of the metal closed container 10 Initial thermal resistance value at a holding temperature of 130 ° C 0.0287 ° C / W Thermal resistance value after 100 times of cycle test 0.0288 ° C / W Temperature difference between the heat receiving surface and the heat radiating surface side of the metal closed container 10 Within 1.0 ° C during 100 cycles No change in flatness of metal sealed container 10 after completion of cycle test

Thus, it is confirmed that the desired heat transport characteristics can be ensured even after the test. This is improved several times or more as compared with the conventional one shown in FIG. And
After the heating / cooling cycle test was completed, it was confirmed that the loop-type heat pipes 11, 11 in the metal closed container 10 had no joint peeling.

Therefore, even when the thermal control is executed in the temperature range from -30 ° C to + 130 ° C, the shrinkage and thermal expansion accompanying the heating / cooling cycle, the internal pressure due to the saturated vapor pressure at that time is 0.4 kgf / cm ² ~ 40k
gf / cm ² Withstands even the alternating load for a long period of time, and highly reliable operation control is realized.

As described above, in the plate heat pipe, the two loop type heat pipes 11, 11 having a meandering structure in which a predetermined amount of hydraulic fluid is enclosed are sandwiched between the metal flat plates 12, and the metal flat plates 12 are formed. The loop-type heat pipes 11 and 11 sandwiched are housed in the metal closed container 10, and the working fluid is sealed in the excess space in the metal closed container 10. According to this, the entire length of the loop-type heat pipes 11, 11 for sandwiching the metal flat plate 12 is wire-bonded to the metal flat plate 12, so that a sufficient bonding area can be obtained, the bonding strength can be increased, and the pressure resistance thereof can be increased. The characteristics can be improved. As a result, it becomes possible to withstand contraction and thermal expansion in a temperature cycle having a wide temperature range from a low temperature range to a medium to high temperature range, and the saturated vapor pressure of the working fluid, and to provide a highly reliable heat treatment for a long time in a wide temperature range. Control is realized.

In the above embodiment, the metal flat plate 12 is formed with a diameter slightly smaller than the accommodating portion 10c of the container body 10a of the metal closed container 10 to form a gap, and the metal flat plate 12 is formed on both sides of the gap. However, the present invention is not limited to this. For example, as shown in FIG. 3, a hole 12a is formed in a portion of the metal flat plate 12 where the loop heat pipes 11, 11 do not exist. Then, it is possible to use this hole so as to communicate with the surplus spaces formed on both surfaces of the metal flat plate 12, and substantially the same effect is expected.

In the above embodiment, the case where the two loop heat pipes 11 and 11 are combined so that the straight pipe lines 11a and 11a of the meandering portions are orthogonal to each other has been described. The configuration is not limited to this, and for example, the straight tubular pipe paths 11a and 11a may be combined so as to be in the same direction. In this case, the heat is dispersed in one direction.

Further, in the above embodiment, the case where the metal flat plate 12 is formed of a metal plate material has been described.
The present invention is not limited to this, and may be formed, for example, by weaving a metal wire into a flat plate shape. In this case, since the metal flat plate itself allows the working fluid to pass therethrough, it is possible to obtain a good heat pipe function without providing a communicating means for communicating the extra space.

Further, in the above embodiment, the case where one set in which the metal flat plate 12 is sandwiched by the two loop heat pipes 11 and 11 is housed in the metal hermetic container 10 has been described. For example, a plurality of sets may be stacked and housed in the metal closed container 10 within a range where the thickness dimension is allowed.

Further, in the above embodiment, the loop type heat pipe 11 having the meandering structure is used for the description, but the present invention is not limited to this pipe structure, for example, an independent straight tube corresponding to the heat transfer direction. A plurality of heat pipes having pipe paths are arranged in parallel, or straight pipe paths of a plurality of loop-shaped heat pipes are arranged in parallel corresponding to the heat transfer direction, or pipe paths It is possible to use various piping structures such as a reciprocating meandering structure in which the reciprocating meandering is performed. That is, the heat pipe accommodated in the metal closed container 10 may have a heat pipe group in which straight pipe paths are arranged in parallel. Therefore,
Of course, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

[0025]

As described above in detail, according to the present invention, it is possible to realize highly reliable thermal control for a long period of time in a wide temperature range from a low temperature region to a medium to high temperature region with a simple structure. A plate heat pipe adapted to be obtained can be provided.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a plate heat pipe according to an embodiment of the present invention.

FIG. 2 is a side view shown to explain the effect of FIG.

FIG. 3 is a plan view showing another embodiment of the present invention.

FIG. 4 is a perspective view showing a play to which the present invention is applied and a usage state of a heat pipe.

FIG. 5 is an exploded perspective view showing a conventional play and heat pipe.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Metal closed container, 10a ... Container main body, 10b ... Lid body, 10c ... Storage part, 11 ... Loop heat pipe, 1
1a ... Pipe path, 12 ... Metal flat plate, 13 ... Heater, 14
…fin.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaaki Yamaguchi No. 1 Komukai Toshiba Town, Komu-ku, Kawasaki City, Kanagawa Prefecture Komu Factory, Toshiba Corporation (72) Inventor Hisaki Akachi, 5-6 Kamizuruma, Sagamihara City, Kanagawa Prefecture Number 5-603

Claims (4)

[Claims] 1. A plurality of heat pipe groups each having a predetermined amount of hydraulic fluid sealed therein and having a plurality of straight pipe paths arranged in parallel, and a plurality of heat pipe groups sandwiched between the plurality of heat pipe groups. There
A metal flat plate in which the heat pipe group is joined to a sandwiching surface and a metal flat plate sandwiched in the plurality of heat pipe groups are housed, and the heat pipe group is joined to an inner wall surface. And a metal hermetically sealed container in which a predetermined amount of hydraulic fluid is enclosed inside a heat receiving portion and a heat radiating portion provided on the outer wall surface. 2. The plate heat pipe according to claim 1, further comprising a communicating means for communicating two surplus spaces formed by being partitioned by the metal flat plate housed in the metal closed container. 3. The plate according to claim 1, wherein the plurality of heat pipe groups are combined so that their pipe paths are substantially orthogonal to each other, and are joined to the sandwiching surface of the metal flat plate, respectively. heat pipe. 4. The plate heat pipe according to claim 1, wherein the metal flat plate is formed by weaving a metal wire.