JP2002267378A - Heat pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat pipe for heat exchanger element that can be improved in heat transfer ability by making working fluids respectively gasified and liquefied in containers to return through optimum passages, can be reduced in manufacturing cost and weight by easily forming a broad heat absorbing section and heat radiating section by flattening the pipe, and can be installed in the small space of a personal computer, etc. SOLUTION: This heat pipe is constituted in such a way that narrow liquid working fluid returning passages 16 are formed among passage forming projecting stripes 15 and between side-wall forming sections 13 and 14 and projecting stripes 15 by providing the projecting stripes 15 in parallel with each other on the first main wall forming section 12 of a container constituting member. In addition, broad gaseous working fluid passages 26 are formed between reinforcing projecting stripes 25 and side wall forming sections 23 and 24 and among the projecting stripes 25 by providing at least one reinforcing projecting stripe 25 on the second main wall forming section 22 of the container constituting member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a heat pipe used as a general heat exchange element.

A heat pipe according to the present invention is a cooling device for a heating element such as a transistor of a computer such as a personal computer (hereinafter referred to as a personal computer), a semiconductor element such as a thyristor and an integrated circuit (IC), and a control semiconductor. In addition, the present invention can be applied to a heat transfer device such as a PTC thermistor and an electric heater, and can also be used for a heat recovery device.

[0003]

2. Description of the Related Art Conventionally, for cooling a semiconductor element of a personal computer, for example, a heat sink made of extruded aluminum (including an aluminum alloy, the same applies hereinafter) or a specially made small-diameter tube has conventionally been used. Heat pipes were used.

[0004] Here, a conventional heat sink made of extruded profile is formed by cutting the extruded profile into a required length, using a flat surface as a semiconductor contact surface, and, on the other side, fins for transmitting heat to air. I have. Extruded heatsinks require a larger heat transfer area to cope with the increase in the amount of heat generated by the recent increase in the output of semiconductors, and therefore require a larger base. On the other hand, since the contact area of the semiconductor is small, the thermal expansion resistance becomes a large ratio. In order to prevent this, it was necessary to thicken the base. However, in this case, there is a practical problem that the base weight is greatly increased.

[0005] A heat pipe type cooler using a small diameter tube has also been put into practical use. In this case, however, the working fluid condensed by heat radiation hardly returns to the heat absorbing portion, and depending on the use conditions, the heat pipe is effective. The heat absorbing part and the heat radiating part require a wide heat absorbing member and a heat radiating member. Therefore, these parts need to be specially manufactured and attached, which causes an increase in cost. There was a problem.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems in the prior art, wherein a working fluid in a gas (vapor) state and a liquid state in a container can be recirculated through respective optimal passages, The heat transfer performance is improved, and the flat shape of the heat pipe makes it possible to easily form a wide heat-absorbing part and a heat-dissipating part, reducing the manufacturing cost and reducing the weight of the heat pipe. As well as
An object of the present invention is to provide a heat pipe that requires a small installation space and can be easily installed in a narrow portion such as a personal computer.

[0007]

In order to achieve the above object, a heat pipe according to a first aspect of the present invention comprises a first main wall forming portion and side wall forming portions integrally formed on both side edges of the first main wall forming portion. And a container forming second member having a second main wall forming portion and side wall forming portions integrally formed on both side edges of the first main member forming portion, and the side wall forming portions of both members are liquid-tight. A heat pipe in which a working fluid is sealed in a flat container in which both ends of the combined container configuration first and second members are closed. The first main wall forming portion is provided with passage forming ridges extending in the longitudinal direction in parallel, between the passage forming ridges, on both side wall forming portions, and adjacent to the passage forming ridges. Between the narrow liquid working fluid return Each of the paths is formed, and at least one reinforcing ridge extending in the longitudinal direction of the second main wall forming portion of the container configuration second member faces any one of the passage forming ridges of the first main wall forming portion. A wide gaseous working fluid passage is formed between the side wall forming portions and the reinforcing ridges adjacent thereto, or between them and between the reinforcing ridges, and the longitudinal direction of each reinforcing ridge is formed. A notch is provided at an intermediate portion of the groove, and the tip of each reinforcing ridge is abutted against the tip of the passage forming ridge, and the notch of each reinforcing ridge is formed as a communication hole for gaseous working fluid passage. It is characterized by having.

The heat pipe according to a second aspect of the present invention includes a first main wall forming portion, and a second main wall forming portion disposed on one side of the first main wall forming portion through a folded side wall forming portion. A container component having a first side wall forming portion integrally formed on an outer edge of the first main wall forming portion and a second side wall forming portion integrally formed on an outer edge of the second main wall forming portion, The first and second main wall forming portions and the first and second side wall forming portions are turned around the turning side wall forming portion as a center, and the first and second side wall forming portions are liquid. A heat pipe in which a working fluid is sealed in a flat container in which both ends of a folded container component are closed and tightly joined, wherein a first main wall of the container component is formed. In the part, the ridge for forming a passage extending in the longitudinal direction is provided in parallel. Narrow liquid working fluid recirculation passages are respectively formed between the passage forming ridges and between the side wall forming portion and the passage forming ridges adjacent thereto, and the second main member of the container constituting member is formed. In the wall forming portion, at least one reinforcing ridge extending in the longitudinal direction is opposed to any of the passage forming ridges of the first main wall forming portion of the folded container component, and the side wall forming portion and the A wide gaseous working fluid passage is formed between adjacent reinforcing ridges or between these and between the reinforcing ridges,
A notch is provided in the middle part of each reinforcing ridge in the longitudinal direction,
The tip of each reinforcing ridge of the second main wall forming portion of the folded container component is brought into contact with the tip of the channel forming ridge of the first main wall forming portion, and the reinforcing ridge is cut. It is characterized in that the notched portion is formed as a communication hole for passing a gaseous working fluid.

In the heat pipe of the present invention, the flat container preferably has a width of 10 to 100 mm.

[0010] The height and length of the container differ depending on the use of the heat pipe. For example, when used as a cooling device of a heating element such as a transistor of a personal computer and a heat transfer device such as a PTC thermistor and an electric heater, the height of the container is 1.0 to 3.0.
mm, the same length is 100 to 500 mm, preferably 20
0 to 300 mm.

On the other hand, when the heat pipe according to the present invention is used for a heat recovery device, the height of the container is 2.0
It is preferable that the length is about 5.0 mm and the length is about 2 to 3 m.

Preferably, the thickness of each of the first main wall forming portion, the second main wall forming portion, and the side wall forming portion of the container component of the heat pipe is 0.1 to 0.6 mm.

The width of the channel forming ridge of the first main wall forming portion is
Preferably, it is 0.1 to 0.6 mm. The height of the ridge for forming the passage is determined by the ratio to the total height of the container, and is preferably 0.3 to 4.0 mm. The height of the passage for returning the liquid working fluid is equal to the inner height of the container. It is desirable that the height be 10 to 50% of the height (circuit height).

[0014] The width of the liquid working fluid recirculation passage in the first main wall forming portion is 0.1 to 0.6 mm. At least three ridges for forming a passage of the first main wall forming portion are necessary, and a value obtained by dividing the width of the container by the pitch of the ridge for forming a passage is three or more. Is the upper limit.

The width of the reinforcing ridge of the second main wall forming portion is 0.1
It is preferably about 0.6 mm. The height of the reinforcing ridge is determined by the ratio to the total height of the container.
It is preferably from 3 to 4.0 mm.

At least one reinforcing ridge of the second main wall forming portion is provided. The width of the gaseous working fluid passage formed between the reinforcing ridge and the side wall forming portion, between the reinforcing ridge and the side wall forming portion, and between the reinforcing ridges is equal to the width of the first main wall forming portion. , And the width of the gaseous working fluid passage is 0.7 to 3.0.
It is preferably 0 mm. The upper limit of the number of reinforcing ridges is
It is the value obtained by dividing the width of the container by the pitch of the reinforcing ridge.

The length of the notch (opening window) of the reinforcing ridge of the second main wall forming portion is, for example, 0.5 to 5 mm. The notch is, for example, staggered when viewed from the plane,
preferable.

The notch of each reinforcing ridge is formed as a communication hole for passing a gaseous working fluid by the lower end of each reinforcing ridge abutting against the upper end of the passage forming ridge. The opening ratio, which is the proportion occupied by the communication holes for gaseous working fluid passage, is preferably in the range of 10 to 40%, particularly preferably in the range of 10 to 30%, and desirably about 20%.

The height of the side wall forming portion of the container component may be any value provided that the total height is within the range of the height of the side wall of the container. When the container constituent member is folded around the folding side wall forming portion to form a flat container, the height of the folding side wall forming portion is determined from the height of the container to the first and second main portions. This is a value obtained by subtracting the thickness of the wall forming portion.

The heat pipe according to the present invention is used in a personal computer or the like in a horizontal state or in a vertical state or an inclined state. When installed in a horizontal state or an inclined state, the heat pipe is normally installed with the narrow liquid working fluid recirculation passage on the side of the first main wall forming portion of the container component of the heat pipe facing downward. If the width of the liquid working fluid recirculation passage is in the range of 0.1 to 0.6 mm, the condensed liquid of the working fluid concentrates on the liquid working fluid recirculation passage side by capillary force, and the liquid and gas ( The interface of (vapor) has a concave liquid meniscus, and the surface tension generated in the meniscus becomes a driving force for returning the working fluid from the condensing side, and the liquid flows through the reflux passage and can return to the evaporating section again. Therefore, depending on the case, the narrow liquid working fluid recirculation passage on the side of the first main wall forming portion can be set up.

[0021]

Next, an embodiment of the present invention will be described.
This will be described with reference to the drawings.

In this specification, front and rear, left and right and up and down are based on FIG. 2, the front is the left side of FIG. 2, the rear is the same right side, and the left and right are forward. Means the upper side of the figure, and lower means the lower side.

FIGS. 1 and 2 show a first embodiment of the present invention, in which a flat heat pipe (1) is installed horizontally.

Referring to FIG. 1, a flat container (2) of a heat pipe (1) according to the present invention has rectangular upper and lower walls (main walls) (2A) and (2B) which are long in the front-rear direction as viewed from a plane. Both walls
(2C) and (2D) and front and rear end walls (2E) and (2F), and are made of metal such as aluminum (including an aluminum alloy) or copper (including a copper alloy).

Such a flat container (2) includes a rectangular lower wall forming portion (first main wall forming portion) (12) and a left and right side edge of the lower wall forming portion (12) which are longer in the front-rear direction as viewed from the plane. Lower component (container first component) (11) having side wall forming parts (13) (14) integrally formed in a rising shape, and lower wall forming part (12)
The upper wall forming portion (second main wall forming portion) (22) and the side wall forming portions (23) (24) integrally formed in the left and right side edges of the upper wall forming portion (22). ) Having the upper component (the second component of the container) (21). These components are combined to form the side wall forming portions (13) (2) of the upper and lower components (11) and (21).
(3) and (14) (24) are joined in a liquid-tight manner, and both front and rear ends of the upper and lower structural members (11) and (21) are closed in a liquid-tight manner by end plates (4) and (5), respectively. .

The flat container (2) includes:
A working fluid (3) comprising water, a hydrocarbon (hydrocarbon) -based refrigerant, for example, a refrigerant of "HFC-134a" used in a refrigeration cycle, or the like is sealed.

On the lower wall forming portion (12) of the lower component (11) of the flat container (2), a ridge (15) for forming a passage extending in the longitudinal direction is provided.
Are provided integrally in parallel, and the ridges (15) (15)
Narrow liquid working fluid recirculation passages (16) are formed between each other and between the left and right side wall forming portions (13) and (14) and the passage forming ridges (15) adjacent thereto. ing.

On the other hand, the upper wall forming portion (22) of the upper component (21)
At least one reinforcing ridge (25) extending in the longitudinal direction is integrally provided, and the reinforcing ridge (25) and the left and right side wall forming portions (23) are provided.
(24) or between the reinforcing ridge (25) and the left and right side wall forming parts (2
A wide gaseous working fluid passageway (26) is formed between (3) and (24) and between the reinforcing ridges (25) and (25).

In the illustrated flat container (2), seven projecting ridges (15) for forming a passage of the lower wall forming part (12) of the lower component (11) are provided. 21) Upper wall forming part (22)
The reinforcing ridges (25) are provided in total three so as to face every other channel forming ridge (15).

A notch (opening window) (27) is provided at a longitudinally intermediate portion of each reinforcing ridge (25), and each reinforcing ridge (2) is provided.
The lower end of (5) is joined to the upper end of the passage forming ridge (15), so that the notch (27) of each reinforcing ridge (25) is connected to the gaseous working fluid passage communication hole (28). ).

In the above, the heat pipe according to the present invention
The width of the flat container (2) of (1) is preferably 10 to 1
00 mm.

The height and length of the container (2) are
It depends on the use of the heat pipe (1). For example, a cooling device for a heating element such as a transistor of a personal computer,
When used as a heat transfer device such as a PTC thermistor or an electric heater, the height of the container (2) is
1.0-3.0mm, the same length is 100-500mm,
Preferably it is 200 to 300 mm.

On the other hand, the heat pipe according to the present invention
When (1) is used for a heat recovery device, the height of the container (2) is preferably 2.0 to 5.0 mm, and the length is preferably 2 to 3 m.

A flat container for the heat pipe (1)
(2) The thickness of the lower wall forming portion (12) and the left and right side wall forming portions (13) and (14) of the lower component member (11) is 0.1 to 0.6 m, respectively.
m is preferred.

The width of the channel forming ridge (15) of the lower component (11) is preferably 0.1 to 0.6 mm. The height of the channel forming ridges (15) is determined by the ratio to the total height of the container (2), but is preferably 0.3 to 4.0 mm. Is preferably 10 to 50% of the inner height (circuit height) of the container (2).

A passage for circulating the liquid working fluid of the lower component (11)
(16) has a width of 0.1 to 0.6 mm. Lower component (1
At least three ridges (15) for forming a passage in (1) are required,
A numerical value obtained by dividing the width of the container (2) by the pitch of the channel forming ridges (15) by three or more is the upper limit of the number of the channel forming ridges (15).

The left and right side wall forming portions of the lower component (11)
(13) The height of (14) is half the height of the container (2) in the illustration, but the height of the left and right side wall forming parts (23) and (24) of the upper component (21) is as follows. And the sum of the two is the container
The height may be within the range of (2). In some cases, for example, the left and right side wall forming portions (13) (14) of the lower component (11)
The left and right side wall forming portions (23) (2) of the upper component (21)
4) may be overlapped, and the left and right side walls of the container (2) may have a double inner / outer structure.

The thickness of the upper wall forming portion (22) and the left and right side wall forming portions (23) and (24) of the upper component member (21) is 0.1 to 0.1, respectively.
It is preferably 0.6 mm. The width of the reinforcing ridge (25) of the upper component (21) is preferably 0.1 to 0.6 mm. The height of the reinforcing ridge (25) is determined by the ratio to the total height of the container (2), and is preferably 0.3 to 4.0 mm.

The left and right side wall forming portions (2
The height of (3) (24) is half the height of the container (2) in the illustration, but the left and right side wall forming portions (13) (1) of the lower component (11) are
In relation to the height of 4), it is sufficient that the sum of the two is within the range of the height of the container (2). Further, as described above, for example, the left and right side wall forming portions (23) and (24) of the upper component member (21) are superimposed on both outer sides of the left and right side wall forming portions (13) and (14) of the lower component member (11). The left and right side walls of the container (2) may have a double inner / outer structure.

At least one reinforcing ridge (25) of the upper component (21) is provided. Then, between the reinforcing ridge (25) and the left and right side wall forming portions (23) and (24), or between the reinforcing ridge (25) and the left and right side wall forming portions (23) and (24) and the reinforcing ridge. (25) (25)
The width of the gaseous working fluid passage (26) formed between them is
The width of the liquid working fluid recirculation passage (16) of the lower component (11) is wider than the width of the gaseous working fluid passage (26).
It is preferably from 0.7 to 3.0 mm. Reinforcing ridges (2
The upper limit of the number 5) is the value obtained by dividing the width of the container (2) by the pitch of the reinforcing ridge (25).

The length of the notch (opening window) (27) of the reinforcing ridge (25) of the upper component (21) is, for example, 0.5 to 5 mm. The cutouts (27) are preferably arranged in a staggered arrangement when viewed from a plane, for example.

The notch (27) of each reinforcing ridge (25) is formed by joining the lower end of each reinforcing ridge (25) to the upper end of the passage forming ridge (15). Although the portion is formed as a communication hole for gaseous working fluid passage (28), the opening ratio, which is the ratio occupied by the communication hole for gaseous working fluid passage (28), is 10 to 10.
It is preferably in the range of 40%, particularly 10 to 30%, and more preferably about 20%.

Flat upper and lower walls (2B) and (2A) and left and right side walls (2
A fin (6) for heat dissipation or heat absorption is attached to the outer surface of C) (2D).

The flat lower wall (2A) of the heat pipe (1)
A semiconductor element (10) such as a transistor of a computer such as a personal computer is attached to the lower surface of the device.

The flat heat pipe (1) of the present invention is manufactured as follows.

First, the lower constituent member (11) and the upper constituent member (21) are formed by, for example, rolling using a roll. As a material of the upper and lower constituent members (11) and (21), for example, aluminum or aluminum alloy, copper or copper alloy is used. As a material, a clad material obtained by clad a brazing material can be used.

Next, after the upper and lower constituent members (11) and (21) are subjected to a degreasing treatment, a flux is applied. Then, the upper and lower components (11) and (21) are combined, and the upper and lower components (11) and (21)
Is heated to the brazing temperature to produce a flat container (2).

At this time, the lower constituent members (11) facing each other
The left and right side wall forming portions (23) and (24) of the upper wall forming portion (22) of the upper wall and the left and right side wall forming portions (13) and (14) of the lower wall forming portion (12). Of the lower wall forming portion (12) and the ridge (15) for forming a passage, and the upper wall forming portion (2).
Combine them so that the required reinforcing ridges (25) of (2) match and face each other, join these butted parts together by brazing, and join the front and rear ends of the flat container (2). The heat pipe (1) is manufactured by sealing with the plates (4) and (5) and enclosing the working fluid (3).

It should be noted that the lower constituent members are formed by roll rolling.
The reason why (11) and the upper component (21) are manufactured is that a narrow passage (concave groove), a narrow ridge, and a left and right side wall forming portion can be easily formed. .

To enclose the working fluid (3) in the container (2), for example, a sealing nozzle (capillary tube) is attached to the front and rear end forming members (4) and (5) which are joined to the front and rear ends of the container (2). And remove the non-condensable gas while working fluid (3)
After the injection, the root of the sealing nozzle (capillary tube) may be cut off and sealed. The amount of the working fluid (3) to be filled needs to be sufficient to fill the lower return passage. The means for sealing the front and rear ends of the container (2) is not limited to the one shown in the figure, and various other sealing means can be used.

According to the heat pipe (1) of the present invention,
For example, when used for cooling a semiconductor device such as a transistor of a computer such as a personal computer, a semiconductor device (10) is attached to a heat absorbing portion, and the working fluid (3) vaporized in the heat absorbing portion is gaseous working. It passes through the fluid passage (26) to the cooling section where the fins (6) are present, where it becomes condensed liquid. The liquid working fluid recirculation passage (16) side is narrower than the gaseous working fluid passage (26), and condensate flows from the gaseous working fluid passage (26) side to the liquid working fluid recirculation passage (16) side. Concentrate by capillary force. On the evaporation side, the interface between liquid and gas (vapor) (3a) has a concave meniscus of liquid, and the surface tension generated in the meniscus becomes the driving force for returning the working fluid (3) from the condensation side, Flows through the reflux passage (16) and returns to the evaporating section again. Liquid working fluid return passage (16)
In order to form a concave liquid surface (3a) due to surface tension, the working fluid (3)
Is housed at a lower level than the upper end. Working fluid
The amount of (3) should be set within the range of 0.5 to 1.2 times the total volume of the liquid working fluid recirculation passage (16) in the container (2). Set.

Here, the effect of the formation of the concave liquid surface (3a) is not to increase the evaporation surface area, but the liquid working fluid should originally disappear in this portion, but the liquid surface is raised by surface tension. Therefore, the working fluid (3) is pulled from the condensing part to make up for it, and the liquid refluxes. The pressure P for recirculating the liquid is established by the relationship between the surface tension ρ and the groove width (recirculation passage width) W, and is expressed by the following equation.

P = 2 · ρ / W Therefore, the greater the pressure P, the greater the recirculating force of the working fluid (3). In other words, the effect increases as the surface tension ρ increases and the groove width W decreases.

However, the returning working fluid (3) returns, causing resistance, and the resistance increases as the groove becomes narrower. From the relationship between these two trade-offs, the best groove width, that is, the liquid working fluid return passage ( That is, the width of the liquid working fluid recirculation passage (16) is preferably in the range of 0.1 to 0.6 mm in the present invention.

The function of the communication hole (28) is as follows.
Of the gaseous working fluid passages (26) formed between the reinforcing ridges (25) on the side and the left and right side wall forming portions (23) and (24) and between the reinforcing ridges (25) and (25). This eliminates a temperature difference and a pressure difference between the adjacent passages (26) and (26), and smoothly evaporates and condenses the working fluid (3).

As described above, the working fluid (3) in the gas (vapor) state and in the liquid state recirculates through the optimum passages, so that heat is transferred from the evaporation side to the condensation side with a small heat transfer resistance. Will move. Even when the heating side is set somewhat higher, the working fluid (3) can be easily moved to the heating side by the capillary force between the ridges, so that the applicable range is expanded. In order to obtain a proper reflux, the width of the reflux passage should be set to 0.
When the thickness is set to 1 mm to 0.6 mm, suitable performance can be obtained in relation to the surface tension and the flow resistance.

The reason is that, in terms of surface tension, a narrower passage width produces a larger recirculation force,
If it is less than 1, the flow resistance of the liquid refrigerant increases, and the amount of recirculation, that is, the amount of heat transfer decreases, which is not preferable. On the other hand, if it exceeds 0.6 mm, a sufficient capillary force cannot be exerted, so that the amount of reflux liquid is also reduced, which is not preferable.
The amount of reflux is also affected by the height ratio of the ridges. If the height of the passage in the reflux section is less than 10%, a sufficient amount of reflux liquid cannot be obtained. Since the number of flowing passages decreases, the flow resistance of gas (steam) increases, and the amount of heat transfer decreases, which is not preferable.

In the above embodiment, the flat container (2) of the heat pipe (1) is made of aluminum,
When hydrocarbon is used as the working fluid, since the internal pressure of the container (2) is higher than the outside air, the container (2)
The side wall forming portions (13), (23) and (1) of the lower wall forming portion (first main wall forming portion) (12) and the upper wall forming portion (second main wall forming portion) (22)
4) While (24) is abutted and joined in a liquid-tight manner, the lower end of each reinforcing ridge (25) is abutted and joined to the upper end of the passage forming ridge (15), for example, If the flat container (2) is made of copper and water is used as the working fluid, the internal pressure of the container (2) will be negative,
The side wall forming portions (13), (23) and (14) of the lower wall forming portion (first main wall forming portion) (12) and the upper wall forming portion (second main wall forming portion) (22) of (2). 24) may be joined in a liquid-tight manner. To prevent the container (2) from dent during negative pressure,
The lower end of (25) and the upper end of the channel forming ridge (15) need only be abutted with each other and need not be joined.

Next, FIG. 3 shows a second embodiment of the present invention. The difference from the first embodiment lies in the structure of the flat container (2) of the heat pipe (1). That is, the container constituent member (30) includes a first main wall forming portion (32) and a folded side wall forming portion (40) on one side thereof.
And a second main wall forming portion (42) arranged via
The container component (30) is folded around the folding side wall forming portion (40) to form a flat container (2).

Further, referring to FIG. 3, a flat container of the heat pipe (1) according to the present invention will be described.
As in the case of the first embodiment, (2) is installed horizontally, and the container (2) has rectangular upper and lower walls (main walls) (2A) that are longer in the front-rear direction when viewed from a plane. (2B), left and right side walls (2C) and (2D), and front and rear end walls (2E) and (2F), and are made of metal such as aluminum (including an aluminum alloy) or copper (including a copper alloy). is there.

The container component (30) comprises a first main wall forming portion (32) and a folded side wall forming portion on one side thereof.
A second main wall forming portion disposed via the first main wall forming portion and a first side wall forming portion integrally formed on an outer edge of the first main wall forming portion;
(33) and a second side wall forming portion (43) integrally formed on the outer edge of the second main wall forming portion (42).

Such a container constituting member (30) is formed around the folded side wall forming portion (40) and is connected to the first and second main wall forming portions (32) and (42) and the first and second side wall portions. Forming part
(33) (43) are folded back so as to face each other, the first and second side wall forming portions (33) (43) are joined in a liquid-tight manner, and the folded back container component (30) By closing both ends with the end plates (4) and (5), a flat container (2) is formed, and the working fluid is sealed in the flat container (2).

The first main wall forming portion (3) of the container component (30)
2), the passage forming ridges (35) extending in the longitudinal direction are integrally provided in parallel, and between the passage forming ridges (35) (35),
And the first side wall forming portion (33) and the folded side wall forming portion (4
0) and the passage forming ridges (35) adjacent thereto are formed with a narrow liquid working fluid recirculation passage (36).

On the other hand, at least one reinforcing ridge (45) extending in the longitudinal direction is formed on the second main wall forming portion (42) of the container component (30) by the first main wall forming portion (42) of the folded container component (30). The reinforcing ridge (45) and the second side wall forming portion (43) are integrally provided so as to face one of the passage forming ridges of the main wall forming portion (32).
And between the folded side wall forming part (40) or the reinforcing ridge
(45), the second side wall forming part (43) and the folded side wall forming part (4
0) and between the reinforcing ridges (45), (45), a wide gaseous working fluid passage (46) is formed.

A notch (opening window) (47) is provided at a longitudinally intermediate portion of each reinforcing ridge (45), and each reinforcing ridge (4) is provided.
The lower end of (5) is joined to the upper end of the passage forming ridge (35), so that the notch (47) of each reinforcing ridge (45) is connected to the gaseous working fluid passage communication hole (48). ).

In the second embodiment, the heat pipe
The size of the flat container (2) of (1) is the same as that of the first embodiment, but the first
The illustrated side wall forming portion (33) and the second side wall forming portion (43) are half the height of the container (2), but the sum of both is within the height of the container (2). Good. In some cases, for example, the second side wall forming portion (43) is superimposed on the outside of the first side wall forming portion (33) of the container component member (30), so that both side walls of the container (2) are double inner and outer. It may have a structure.

On the other hand, in the second embodiment, since the container constituting member (30) is folded around the folding side wall forming portion (40) to form the flat container (2), The height of the side wall forming portion (40) is a value obtained by subtracting the thicknesses of the first and second main wall forming portions (32) and (42) from the height of the container (2).

The thickness of each of the first and second side wall forming portions (33) and (43) and the folded side wall forming portion (40) of the container component (30) is 0.1 to 0.6 mm. preferable.

The other points of the second embodiment are the same as those of the first embodiment.

In each of the embodiments described above, the heat pipe used for cooling the semiconductor element of the personal computer has been described. However, the heat pipe according to the present invention is not limited to the integrated circuit (IC) of a computer such as a personal computer and the control circuit. It can be applied to a cooling device for a heating element such as a semiconductor for use, or a heat transfer device such as a PTC thermistor or an electric heater, and can also be used as a heat recovery device.

In the case where the heat pipe (1) of the present invention is applied to a heat recovery apparatus, although not shown, for example, a plurality of heat pipes (1) of the present invention have a predetermined gas flow gap therebetween. These heat pipes (1) are arranged straddling the high-temperature exhaust gas passage and the low-temperature heat recovery passage, and the outer surface of the heat pipe (1) has plate fins, corrugated Fins such as fins are attached.

The figure shows a state in which the flat heat pipe (1) according to the present invention is installed horizontally, but in some cases, the heat pipe (1) is turned upside down. That is, a narrow liquid working fluid recirculation passage (16) on the side of the first main wall forming portion (lower wall forming portion) (12, 32) of the container (2).
It may be installed with (36) facing up. Further, the heat pipe (1) according to the present invention may be installed and used in a vertical state or an inclined state.

[0073]

As described above, the heat pipe according to the first aspect of the present invention has a first member constituting a container having a first main wall forming portion and side wall forming portions integrally formed on both side edges of the first main wall forming portion. And the container-forming second member having the second main wall forming portion and the side wall forming portions integrally formed on both side edges thereof are combined, and the side wall forming portions of both members are joined in a liquid-tight manner and combined. A heat pipe in which a working fluid is sealed in a flat container in which both ends of the container configuration first and second members are closed, wherein the first main wall forming portion of the container configuration first member is The channel forming ridges extending in the longitudinal direction are provided in parallel, between the channel forming ridges, and between the side wall forming portions and the channel forming ridges adjacent thereto, the width is narrow. Liquid working fluid recirculation passages are formed, respectively, In the second main wall forming portion of the second member, at least one reinforcing ridge extending in the longitudinal direction faces one of the passage forming ridges of the first main wall forming portion, and both side wall forming portions. Since a wide gaseous working fluid passage is formed between the ridge and the reinforcing ridge adjacent thereto or between these and between the reinforcing ridges, the gas (steam) is formed in the container. Since the working fluid in the form and the liquid flows back through the respective optimal passages, heat moves from the evaporation side to the condensation side with a small heat transfer resistance. Therefore, even when the heating side is set somewhat higher, the working fluid can easily move to the heating side by the capillary force between the ridges, so that the heat transfer performance is improved and the applicable range of the heat pipe is expanded.

A notch is provided at a longitudinally intermediate portion of each reinforcing ridge of the container-constituting second member, and the tip of each reinforcing ridge is abutted against the tip of the channel forming ridge, and Since the notch portion of the reinforcing ridge is formed as a communication hole for gaseous working fluid passage, between the side wall forming portion and the reinforcing ridge adjacent thereto, or between these and between the reinforcing ridges. Among the gaseous working fluid passages formed in the above, the temperature difference and the pressure difference between the adjacent passages are eliminated, the working fluid is smoothly evaporated and condensed, and the heat transfer performance is further improved.

In the heat pipe according to the first aspect of the present invention, the first and second members of the container constituting the container can be formed by rolling a metal plate made of, for example, copper or aluminum using a roll. Without using a conventional extruded material, it is possible to achieve weight reduction and make the heat pipe flat.
Wide heat-absorbing part and heat-dissipating part can be easily formed,
Since the manufacturing cost is low and the installation space is small, there is an effect that it can be easily installed in a narrow portion such as a personal computer.

The heat pipe according to the second aspect of the present invention comprises:
As described above, the first main wall forming section, the second main wall forming section disposed on one side of the first main wall forming section via the folded side wall forming section,
A container component having a first side wall forming portion integrally formed on the outer edge of the main wall forming portion and a second side wall forming portion integrally formed on the outer edge of the second main wall forming portion is used for folding. The first and second side wall forming portions are folded back around the side wall forming portion so that the first and second main wall forming portions and the first and second side wall forming portions face each other, so that the first and second side wall forming portions are liquid-tight. A heat pipe in which a working fluid is sealed in a flat container in which both ends of a folded container component are closed and joined together, wherein the first main wall forming portion of the container component is The channel forming ridges extending in the longitudinal direction are provided in parallel, between the channel forming ridges,
A narrow liquid working fluid recirculation passage is formed between the side wall forming portion and the passage forming ridge adjacent thereto, and at least the longitudinally extending liquid working fluid recirculating passage extends in the second main wall forming portion of the container component. One reinforcing ridge is opposed to one of the channel forming ridges of the first main wall forming portion of the folded container component, and is between the side wall forming portion and the reinforcing ridge adjacent thereto, or Also, since a wide gaseous working fluid passage is formed between these and between the reinforcing ridges, the working fluid easily moves to the heating side similarly by the capillary force between the ridges. As a result, the heat transfer performance is improved, and the applicable range of the heat pipe is expanded.

A notch is provided at a longitudinally intermediate portion of each reinforcing ridge of the second main wall forming portion, and a tip portion of each reinforcing ridge of the second main wall forming portion of the folded container component member. Are abutted against the distal end of the passage forming ridge of the first main wall forming portion, and the notch portion of each reinforcing ridge is formed as a communication hole for gaseous working fluid passage. Eliminating the temperature difference and pressure difference between the gaseous working fluid passages that match each other, the working fluid is smoothly evaporated and condensed, and the heat transfer performance is further improved.

In the heat pipe according to the second aspect of the present invention, the container component can be formed by rolling a metal plate made of, for example, copper or aluminum using a roll, and the container component is formed by folding back side walls. Since it is manufactured by being folded around the forming portion, the number of joints can be reduced accordingly, and the effect of using the working fluid is further reduced.

[Brief description of the drawings]

FIG. 1 is an enlarged schematic cross-sectional view of a heat pipe showing a first embodiment of the present invention.

FIG. 2 is a schematic vertical sectional view of the heat pipe.

FIG. 3 is an enlarged schematic cross-sectional view of a heat pipe showing a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 heat pipe 2 container 2A upper wall (main wall) 2B lower wall (main wall) 2C left side wall 2D right side wall 2E front end wall 2F rear end wall 3 working fluid 11 lower constituent member (container constituent first member) 12 lower wall formation Part (first main wall forming part) 13 Left side wall forming part 14 Right side wall forming part 15 Convex ridge for passage formation 16 Narrow passage for liquid working fluid recirculation 21 Upper constituent member (Container constituent second member) 22 Upper wall formation Part (second main wall forming part) 23 Left side wall forming part 24 Right side wall forming part 25 Reinforced ridge 26 Wide gaseous working fluid passage 27 Notch 28 Communication hole for gaseous working fluid passage 30 Container constituent member 32 First Main wall forming portion 33 First side wall forming portion 35 Protrusions for forming passages 36 Narrow liquid working fluid return passage 40 Folding side wall forming portions 42 Second main wall forming portion 43 Second side wall forming portions 45 Reinforcement protruding lines 46 width Gaseous working fluid passage 47 notch 48 gaseous working fluid passage communicating hole of

Continuing on the front page (72) Inventor Takashi Tamura 6,224 Kaiyamacho, Sakai City Showa Aluminum Co., Ltd. (72) Inventor Takashi Terada 6,224 Kaiyamacho Sakai City, Showa Aluminum Co., Ltd. (72) Invention Person Hirofumi Horiuchi 6,224, Kaiyama-cho, Sakai City Showa Aluminum Co., Ltd. (72) Inventor Futa Watanabe 6,224, Kaiyama-cho Sakai City, Showa Aluminum Co., Ltd.

Claims (2)

[Claims] 1. A container forming first member having a first main wall forming portion and side wall forming portions integrally formed on both side edges of the first main wall forming portion,
And the container-forming second member having the second main wall forming portion and the side wall forming portions integrally formed on both side edges thereof are combined, and the side wall forming portions of both members are joined in a liquid-tight manner and combined. A heat pipe in which a working fluid is sealed in a flat container in which both ends of the container configuration first and second members are closed, wherein the first main wall forming portion of the container configuration first member is The channel forming ridges extending in the longitudinal direction are provided in parallel, between the channel forming ridges, and between the side wall forming portions and the channel forming ridges adjacent thereto, the width is narrow. A passage for liquid working fluid recirculation is formed, and at least one reinforcing ridge extending in the longitudinal direction is formed on the second main wall forming portion of the container constituting second member, the passage forming ridge of the first main wall forming portion. Opposite any one and both side wall forming part A wide gaseous working fluid passage is formed between the reinforcing ridges adjacent thereto or between them and between the reinforcing ridges, and a notch is formed at a longitudinal intermediate portion of each reinforcing ridge. Provided, the tip of each reinforcing ridge is abutted against the tip of the channel forming ridge,
A heat pipe, wherein a cutout portion of each reinforcing ridge is formed as a communication hole for passing a gaseous working fluid. 2. A first main wall forming portion, a second main wall forming portion disposed on one side of the first main wall forming portion with a folded side wall forming portion interposed therebetween, and a first main wall forming portion;
A container component having a first side wall forming portion integrally formed on the outer edge of the main wall forming portion and a second side wall forming portion integrally formed on the outer edge of the second main wall forming portion is used for folding. The first and second side wall forming portions are folded back around the side wall forming portion so that the first and second main wall forming portions and the first and second side wall forming portions face each other, so that the first and second side wall forming portions are liquid-tight. A heat pipe in which a working fluid is sealed in a flat container in which both ends of a folded container component are closed and joined together, wherein the first main wall forming portion of the container component is The channel forming ridges extending in the longitudinal direction are provided in parallel, between the channel forming ridges,
A narrow liquid working fluid recirculation passage is formed between the side wall forming portion and the passage forming ridge adjacent thereto, and at least the longitudinally extending liquid working fluid recirculating passage extends in the second main wall forming portion of the container component. One reinforcing ridge is opposed to one of the channel forming ridges of the first main wall forming portion of the folded container component, and is between the side wall forming portion and the reinforcing ridge adjacent thereto, or A wide gaseous working fluid passage is formed between these and between the reinforcing ridges, and a notch is provided at a longitudinally intermediate portion of each reinforcing ridge, and the second part of the folded container component member is formed. The front end of each reinforcing ridge of the main wall forming portion is abutted against the front end of the passage forming ridge of the first main wall forming portion, and the cutout portion of each reinforcing ridge is used for gaseous working fluid passage. A heat path characterized by a communication hole Flop.