JPH1062080A - Piping member and heat pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piping member and a heat pipe which make it unnecessary to form a swelling part on a flat side of a plate body in the case when a pipe body is joined to the end part of the plate body which has a hollow part inside and of which one side is made flat. SOLUTION: A plate body 1 which has, inside, a hollow part having a semicircular section and opening in one end face, on one surface side of which a swelling part 4 having a semicircular section is formed and the other surface side of which is made flat and a pipe body 2 in one end of which an insertion part 8 having a semicircular section corresponding to the shape of the section of the inner peripheral surface of an opening part 6A of the hollow part is formed are provided, and the insertion part 8 of the pipe body 2 is inserted into the opening part 6A of the plate body 1 and joined thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piping member provided with a metal plate having a hollow flow path therein, and a metal pipe connected to the hollow flow path, and a heat pipe.

[0002]

2. Description of the Related Art By bonding two metal plates together, setting this composite plate in an expansion tube mold and injecting high-pressure water,
2. Description of the Related Art A technique of forming a hollow channel having an arbitrary shape by expanding one or both of metal plates by expansion is conventionally known, and is used in, for example, an air conditioner, a heat conductor of a refrigerator, and other wide fields. By the way, when a metal pipe is connected to a composite plate having a hollow flow path formed by expanding a pipe as described above, an opening opening at an end surface of the composite plate is expanded into a circle using a tool, and the circular opening is formed. In general, a structure in which one end of a metal tube is inserted and joined by brazing or the like has been adopted.

[0003]

However, in such a structure, the opening formed in the end face of the composite plate must be enlarged to have a circular cross section. Therefore, only one of the metal plates is expanded. It was difficult to keep the other metal plate flat, and in the vicinity of the end face of the composite plate, both metal plates had to be processed into semicircular shapes. Therefore, one side of the composite plate in the obtained piping member could not be completely flattened.

[0004] For example, FIG. 14 shows a composite plate 30 in which two metal plates are adhered to each other, and only one of the metal plates is expanded to form an expanded tube portion 32, so that a semicircular cross section is formed in the composite plate 30. A pipe member in which a hollow passage having a rectangular shape is formed, and a metal pipe 34 is connected to an end of the hollow passage. In this piping member, in order to enhance the adhesion to the object to be cooled, the hollow channel itself is formed into a semicircular shape, and the composite plate 3 is formed.
However, even if one side of the metal pipe 34 is flattened, an opening having a circular cross section enough to accommodate the outer diameter of the metal tube 34 must be formed at the end of the composite plate 30. Must be plastically worked to form the bulging portions 36 and 38, respectively. That is, the bulging portion 36 is also generated on the flat surface side of the composite plate.

For this reason, the bulging portion 36 hinders the object to be cooled from being brought into close contact with the entire surface of one side of the composite plate 30. For example, as shown in FIG. When cooling both sides of the thin electric element 40 in parallel with a pair of common piping members and cooling by circulating a cooling medium, the metal tubes 34 are directed to the same side because the bulging portions 36 interfere with each other. And must be directed in different directions. In such a case, the cooling medium path for circulating the cooling medium through the metal pipe 34 cannot be simplified, and the cooling mechanism cannot be downsized. In particular, recently, there has been an increasing demand for intensively and efficiently cooling a small-sized element having a large calorific value by using a simple cooling system, but it has not been able to sufficiently meet the demand.

As shown in FIG. 16, only one metal plate 44 is extremely swelled, and the other metal plate 42 is not swelled at all to form an opening into which the metal tube 46 can be inserted. It is not surprising that the metal plate 4
In addition, the bulging portion 4 is thinned to be easily broken, and a large triangular gap 48 is provided between the metal tube 46 and the opening.
Is difficult to hermetically seal, and is actually difficult to manufacture.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and when a pipe is joined to an end of a flat plate having a hollow inside and a flat surface, a flat surface of the plate is formed. It is an object of the present invention to provide a pipe member and a heat pipe which do not need to form a bulge.

[0008]

In order to achieve the above-mentioned object, a pipe member according to the present invention has a hollow channel having a semicircular cross section open at least on one end surface, and extends along the hollow channel. A bulged portion having a semicircular cross section is formed on one side, but a flat plate body is formed on the other side, and a half section corresponding to the cross sectional shape of the inner peripheral surface of the opening of the hollow flow channel at one end. A tubular body having a circular insertion portion formed therein, wherein the insertion portion of the tubular body is inserted into and joined to the opening of the plate body.

Further, the heat pipe according to the present invention has a hollow channel having a semicircular cross section opened at at least one end surface, and a swelling having a semicircular cross section is formed on one surface side along the hollow channel. The protruding portion is formed, but the other surface side is a flat plate, and an insertion portion having a semicircular cross section corresponding to the cross sectional shape of the inner peripheral surface of the opening of the hollow flow path is formed at one end, A tube body having the other end sealed, wherein the insertion portion of the tube body is inserted into and joined to the opening of the plate body, and a working fluid is sealed inside the tube body It is characterized by being.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] FIGS. 1 and 2 are a plan view and a side view showing a first embodiment of a heat pipe according to the present invention. The heat pipe includes a plate 1 and two pipes 2 connected to the plate 1. The plate 1 is brought into contact with an object to be cooled, A heat radiating means is fixed to the end and used for use. The plate body 1 is formed, for example, by laminating two metal plates, forming a bulged portion 4 having a semicircular cross section bulging in the thickness direction on only one metal plate, and flattening the other metal plate. In this manner, a semicircular hollow portion 4A whose section is crushed as shown in FIG. 4 is formed between two metal plates.
Are formed in parallel with each other.

The plate 1 of this embodiment has a rectangular shape, and the hollow portion 4A has a linear shape with only one end opened at one end surface of the plate 1, and its length is equal to the other end of the plate 1. Is not reached. However, the present invention is not limited to this configuration. For example, the plate 1 may have another shape such as a circular shape or a polygonal shape, and may be three-dimensionally bent or curved if necessary. The number of hollow portions 4A may be only one, or may be three or more. Further, the hollow portion 4A may be a U-shaped or other flow path with both ends opened.

The plate 1 also has enlarged portions 6 corresponding to the openings of the hollow portions 4A. These enlarged portions 6 are portions into which the tubular body 2 is inserted, and as shown in FIG. A portion 6A is formed. Note that the term “semicircular cross-section” as used herein does not strictly mean only a semicircular cross-section,
It is defined as broadly including a trapezoidal cross section or a shape close to a triangular cross section. However, in any case, the bottom surface is flat. This is common to all embodiments.

On the other hand, an insertion portion 8 having an outer peripheral surface having a semicircular cross section corresponding to the cross sectional shape of the inner peripheral surface of the opening 6A of the enlarged portion 6 is formed at one end of the tubular body 2. With the insertion portion 8 inserted into the opening 6A, the tube 2 is air-tightly fixed to the plate 1 by brazing or the like. The outer shape of the insertion portion 8 is formed in the opening 6 so that brazing with high airtightness can be performed.
It is desirable that the shape conforms to the inner surface shape of A as much as possible.

The shape of the insertion portion 8 of the tube 2 is shown in FIGS. As shown in these figures, a fixed length portion at the distal end of the tube body 2 is crushed in the radial direction to substantially the center, has a semicircular cross section, and is an insertion portion 8 which projects evenly in the lateral direction. That is, the diameter of the insertion portion 8 is larger than the diameter of the tube 2. The boundary between the insertion portion 8 and the other portion of the tube 2 is formed as a gentle slope.

The material of the plate 1 and the tube 2 is not limited in the present invention, and may be any material such as various metals, plastics, and ceramics. However, heat transfer performance such as the heat pipe of this embodiment is required. In such a case, copper, a copper alloy, aluminum, an aluminum alloy or the like is preferable. The dimensions of the plate 1 and the length of the tube 2 are not particularly limited. However, when this embodiment is used as a heat pipe for cooling a semiconductor element, the length of the tube 2 is 100 to 500.
mm, the width of the hollow part 4A is about 10 to 40 mm, the height of the hollow part 4A is about 3 to 12 mm, the length of the hollow part 4A is about 50 to 500 mm, and the outer diameter of the tube 2 is 6 to 22 mm.
It is preferable that the degree is about the same.

In this embodiment, an appropriate amount of hydraulic fluid is filled in each tube 2, and the ends of the tubes 2 are closed.
As the working fluid, pure water, alcohol, other organic solvents, freon, or a mixture thereof can be used, but is not limited thereto. To close the end of the tube 2, the end may be crushed, an end plug may be used, or another plate 1 may be used as in the embodiment of FIG.
May be connected.

In order to promote the reflux of the hydraulic fluid, the pipe 2
It is preferable to form a wick on at least a part of the inner surface of the wick. As a wick, it is easy to form a spiral or linear groove 10 on the inner surface of the tube 2 as shown in FIG. 8, but in addition, the inner surface of the tube 2 may be roughened or minute. Any wick conventionally used in the field of heat pipes may be formed, such as forming projections or minute recesses, or rolling and inserting a wire mesh sheet. Further, the wick does not have to be formed on the entire surface of the tubular body 2 and may be formed only on a necessary portion. For example, as shown in FIG. 9, the wick may not be formed on the inner surface of the insertion portion 8.

Further, in order to promote the boiling of the working fluid in the hollow portion 4A of the plate 1, the inner surface of the hollow portion 4A may be roughened. When the surface is roughened to promote boiling, the surface roughness Ra is preferably about 0.002 to 0.5 mm, and more preferably 0.1 to 0.5 mm.
003-0.1 mm is convenient.

As a manufacturing method of this embodiment, the plate 1
Is formed of a metal, the following method can be exemplified. First, two metal plates are prepared, and a release agent is applied to one of the metal plates by printing or the like to form a release agent layer forming a pattern of the hollow portion 4A. A sparingly soluble inorganic powder such as barium sulfate or a carbon powder may be used as the release agent, and may be used by being dispersed in a liquid such as polyvinyl alcohol or water during application. The solvent is removed by heating.

Next, the other metal plate is placed on the side on which the release agent layer is formed, and the two are diffusion-bonded by pressing and heating. At this time, since the particles of the release agent slightly bite into the surface of the metal plate, it is possible to adjust the roughness of the inner surface of the hollow portion 4A by adjusting the particle size and hardness of the release agent. When the joining is completed, the end corresponding to the release agent layer is pryed open to connect the pipe, and the composite plate is placed in a mold in which a depression corresponding to the bulging portion 4 to be formed is formed in advance, and both sides are restrained. Then, a swelling portion 4 is formed by injecting a high pressure fluid. And the plate 1
After cutting off the end to which the pipe was connected, the end of the opened hollow portion 4A was expanded with a jig to form an enlarged portion 6,
The insertion portion 8 of the previously formed tube 2 may be inserted into the opening 6A and brazed. However, this manufacturing method is an example, and the present invention is not limited only to this method. For example, an enlarged portion 6 is formed before inflation to connect the tubes 2, and a high-pressure fluid is injected through these tubes 2,
It is also possible to form the bulge 4.

According to the heat pipe having the above configuration,
As shown in FIG. 2, it is possible to completely flatten the surface of the plate 1 opposite to the bulging portion 4. Therefore, the plate 1
10 can be brought into contact with the object to be cooled.
As shown in (2), when the semiconductor element 20 to be cooled is sandwiched between two heat pipes, even if the semiconductor element 20 is thin, the pipes 2 are directed in the same direction without interfering with each other. In this state, it is possible to arrange two pipe members. If the tubes 2 can be arranged in the same direction as described above, the heat radiating means connected to the other end of the tubes 2 can be shared, and the space can be saved.

Further, since the cross section of the enlarged portion 6 is semicircular, it is not necessary to enlarge the opening of the hollow portion 4A to an unreasonable shape, and breakage and cracks hardly occur when the enlarged portion 6 is formed. Accordingly, a tube 2 having a large diameter can be used. In the case of a heat pipe, the present invention is preferable because it is necessary to make the pipe 2 thick to some extent in order to enhance the circulation of the working fluid.

[Second Embodiment] As shown in FIG. 11, the tube 2 may be inclined with respect to the plate 1 by slightly bending the insertion portion 8 of the tube 2. In this case, the pipes 2 can be further separated from each other with the semiconductor element 20 interposed therebetween, and there is an advantage that the thin-film semiconductor element 20 can be used.

[Third Embodiment] As shown in FIG. 12, a bulging portion 4 is formed in a U-shape in plan view, and enlarged portions 6 are provided at both ends thereof.
May be formed, and the pipes 2 may be connected to each other. The connection structure between the plate 1 and the tube 2 and other configurations may be the same as in the previous embodiment. In this case, the application is more suitable for cooling or heating an object by circulating a heat medium from one pipe 2 to the other pipe 2 than a heat pipe.
In that case, the end of the tube 2 is opened, and the working fluid is not sealed. If the working fluid is sealed in the pipe 2, it can be used as a heat pipe. However, it is necessary to consider the posture when using the heat pipe so that the working fluid is evenly distributed to the two pipes 2. .

Instead of forming the hollow portion 4A in a U-shape, the hollow portion 4A may be formed in a straight shape, an L-shape, a meandering shape or the like in which the pipes 2 are connected to both ends. The same applies when used as a heat pipe.

[Fourth Embodiment] As shown in FIG.
A heat pipe (or piping member) having a configuration in which two plate members 1 are connected by a tube member 2 is also possible. Tube 2 and hollow portion 4A
Is not limited. The plate 1 may be shifted in parallel as shown, may be angled, or may be located on the same plane. Other configurations are the same as those of the first embodiment. According to this embodiment, the semiconductor device 20
The working fluid boils inside the hollow portion 4 </ b> A of the first plate 1 brought into contact with the first plate 1, and its vapor flows through the pipe 2 to the second plate 1, and is transmitted to the heat radiation means 22. The heat radiating means 22 may be a heat sink or a Peltier element for cooling. The working liquid liquefied in the hollow portion 4 </ b> A of the second plate 1 flows back to the first plate 1 through the pipe 2 again.

Also in this embodiment, since one surface of each plate 1 can be completely flattened, the entire surface of one surface of the plate 1 can contact the semiconductor element 20 or the heat radiating means 22 without waste, and compactness can be achieved. I can do it.

In the above description, only an example in which the present invention is used as a heat transfer body or a heat pipe has been described. However, the present invention is not limited to only heat transfer applications, and may be, for example, a pipe member for transferring a fluid. Can also be used.

[0029]

EXAMPLE A plate made of phosphor deoxidized copper (JIS C12200) having a thickness of 2 mm and a width of 110 mm and three sets of a plate made of the same material and having a thickness of 4 mm and a width of 110 mm were prepared, and one side of each plate was polished and degreased. did. On the surface of one plate,
A release agent obtained by dispersing barium sulfate fine powder in water was applied to form a release agent layer corresponding to the swollen portion 4 as shown in FIG. The width of the release agent layer was 20 mm, and the center line interval between the release agent layers was 42 mm.

Next, the other plate material is placed on the release agent layer, heated in a mixed gas atmosphere of nitrogen gas and hydrogen gas, and hot-rolled at a rolling reduction of 33% to obtain a composite plate having a thickness of 4 mm and a width of 110 mm. Were obtained. After prying open the end face of each composite plate at a position corresponding to the release agent layer and connecting a metal tube, the composite plate is set in an inflation tube mold having a concave portion having a shape corresponding to the bulging portion 4, To form a bulge 4 on the thinner metal plate side. The end of each composite plate to which the metal tube was connected was cut off over a certain width.

Regarding the first composite plate, the open hollow portion 4
By inserting a jig into A, the diameter can be further expanded in the cold,
The enlarged portion 6 having a semicircular cross section as shown in FIG.
When formed to a height of 11 mm, processing was possible without causing cracks in the enlarged portion 6. On the other hand, the outer diameter is 15.88.
mm end of the copper tube was processed into a semicircular shape corresponding to the opening 6A of the enlarged portion 6 and then inserted into the opening 6A, so that brazing could be easily performed and the airtightness was sufficient. there were.

Regarding the second composite plate, the open hollow portion 4
By inserting a jig into A, the diameter can be further expanded in the cold,
When an enlarged portion having a semicircular cross section as shown in FIG. 16 was formed so that a copper tube having an outer diameter of 15.88 mm could be inserted, breakage occurred at the enlarged portion.

Therefore, the third composite plate is shown in FIG. 16 so that a jig is inserted into the opened hollow portion 4A to further expand the diameter in the cold state and a copper tube having an outer diameter of 12.77 mm can be inserted. When a magnified portion having a semicircular cross section as shown was formed, no break occurred at the magnified portion. However, when a copper tube having an outer diameter of 12.77 mm was inserted into these openings, the gap was large and airtight. It was difficult to braze.

[0034]

As described above, according to the piping member and the heat pipe according to the present invention, it is possible to completely flatten the surface of the plate body opposite to the bulging portion. In addition to being able to abut the entire surface of the body on one side of the body, for example, when sandwiching an article between two heat pipes, even if the article is thin, the pipes can be oriented in the same direction without interfering with each other. It is possible to arrange two pieces of the present invention in a state where they are folded. If the tubes can be arranged in the same direction as described above, the one connected to the other end of the tubes can be shared, and the space can be saved.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a heat pipe according to the present invention.

FIG. 2 is a side view of the embodiment.

FIG. 3 is a diagram viewed from the line III in FIG. 1;

FIG. 4 is a sectional view taken along line IV in FIG.

FIG. 5 is a longitudinal sectional view of a tube used in the embodiment.

FIG. 6 is a plan view of a tube used in the embodiment.

FIG. 7 is a bottom view of the tube used in the embodiment.

FIG. 8 is a cross-sectional view of a tube used in the embodiment.

FIG. 9 is a sectional view of an insertion portion of the tubular body.

FIG. 10 is a side view of a use mode of the embodiment.

FIG. 11 is a side view of a use mode of another embodiment according to the present invention.

FIG. 12 is a plan view of still another embodiment according to the present invention.

FIG. 13 is a side view of a use mode of still another embodiment according to the present invention.

FIG. 14 is a side view showing a problem of the related art.

FIG. 15 is a side view showing a problem of the related art.

FIG. 16 is a cross-sectional view of a main part showing a problem of the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plate body 2 Tube 4 Swelling part 6 Enlarged part 8 Insertion part 10 Groove 20 Semiconductor element

Continued on the front page (72) Inventor Shinhide Sato 128-7 Ogimachi, Aizuwakamatsu-shi, Fukushima Prefecture Mitsubishi Shindoh Co., Ltd. (72) Inventor Masami Takahashi 128-7, Ogimachi 128, Aizuwakamatsu-shi, Fukushima Mitsubishi Shindoh Co., Ltd. Wakamatsu Works (72) Inventor Toshihiro Kaneda 128-7 Ogimachi, Aizuwakamatsu City, Fukushima Prefecture Mitsubishi Shindoh Wakamatsu Works

Claims (4)

[Claims] 1. A hollow channel having a semicircular cross section open at least on one end surface, and a bulging portion having a semicircular cross section is formed on one surface side along the hollow channel. The other surface side includes a flattened plate body, and a tube body formed with an insertion portion having a semicircular cross section corresponding to a cross sectional shape of an inner peripheral surface of the opening of the hollow flow path at one end. The said insertion part of a body is inserted in the said opening part of the said plate body, and is joined, The piping member characterized by the above-mentioned. 2. At least a part of the inner surface of the tubular body,
The piping member according to claim 1, wherein a wick is formed. 3. The piping member according to claim 1, wherein the pipe has a circular cross section, and only a tip portion is formed in a semicircular cross section to serve as the insertion portion. 4. A hollow channel having a semicircular cross section opened at least on one end surface, and a bulging portion having a semicircular cross section is formed on one surface side along the hollow channel. A tube in which the other surface side is a flat plate, and one end is formed with an insertion portion having a semicircular cross section corresponding to the cross sectional shape of the inner peripheral surface of the opening of the hollow flow path, and the other end is sealed. A heat pipe, wherein the insertion portion of the tube is inserted into and joined to the opening of the plate, and a working fluid is sealed inside the tube.