Heat pipe, heat exchange device, and method for manufacturing a heat pipe

Abstract

To provide a heat pipe improved in heat exchange efficiency, and to provide a method for manufacturing the same.SOLUTION: In a heat receiving chamber 120 and a heat radiation chamber 140 of a heat pipe 100, a width in a second direction is longer than a width in a second direction of a connection pipe 101 when viewed from a first direction. A plurality of wicks 105 are formed in a line at least in the second direction, and the wicks 105 have a groove shape formed in the heat receiving chamber 120, the heat radiation chamber 140 and an inner wall surface of the connection pipe 101. At least the one wick 105 has a heat receiving chamber side bent part and a heat radiation chamber side bent part 142 bent in the second direction in the heat receiving chamber 120 and the heat radiation chamber 140 when viewed in the first direction. In the wicks 105 adjacent in the second direction, an interval in the heat receiving chamber 120 and an interval in the heat radiation chamber 140 are wider than an interval in the connection pipe 101. The heat receiving chamber 120, the heat radiation chamber 140, the connection pipe 101 and the wicks 105 are integrally molded by laminate molding metal powder.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a heat pipe, which is a type of heat exchanger, a heat exchange device including a heat pipe, and a method for manufacturing a heat pipe. [Background technology]

[0002] Heat pipes have been known as a type of heat exchanger for some time. For example, Patent Document 1 proposes a heat pipe in which the cross-sectional areas of the heat receiving portion and the heat radiating portion are larger than the cross-sectional area of ​​the connecting portion.

[0003] In recent years, research and development into energy efficiency has been actively conducted to ensure that more people have access to affordable, reliable, sustainable, and advanced energy. To contribute to energy efficiency, there is a demand for improved heat exchange efficiency in heat exchangers, including heat pipes. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5323614 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the heat pipe of Patent Document 1, the heat dissipation section, heat receiving section, connection section, etc. are each composed of separate parts, so these parts must be assembled when manufacturing the heat pipe, which makes the manufacturing process complicated and tends to increase the size (thickness).In addition, the wick, which is mainly responsible for heat dissipation, is concentrated in the center of the cross section of the heat pipe, making it difficult to efficiently input and release heat.

[0006] The present invention provides a heat pipe with improved heat exchange efficiency and a method for manufacturing the heat pipe. [Means for solving the problem]

[0007] The present invention provides A heat receiving chamber; A heat dissipation chamber, a tubular connecting pipe that connects the heat receiving chamber and the heat dissipation chamber; a plurality of wicks extending inside the heat receiving chamber, the heat dissipation chamber, and the connecting pipe; A heat pipe in which a refrigerant flows through the heat receiving chamber, the heat dissipation chamber, and the connecting pipe, The heat receiving chamber is When viewed from a first direction perpendicular to the longitudinal direction of the connecting pipe, a width of the connecting pipe in a second direction perpendicular to both the longitudinal direction and the first direction is longer than the width of the connecting pipe in the second direction, The heat dissipation chamber is When viewed from the first direction, the width in the second direction is longer than the width of the connecting pipe in the second direction, The plurality of wicks are formed side by side in at least the second direction, the wick has grooves formed on the inner wall surfaces of the heat receiving chamber, the heat dissipation chamber, and the connecting pipe; At least one of the wicks has a heat receiving chamber side bent portion that is bent in the second direction in the heat receiving chamber when viewed from the first direction, At least one of the wicks has a heat dissipation chamber side bent portion that is bent in the second direction in the heat dissipation chamber when viewed from the first direction, The wicks adjacent to each other in the second direction are spaced apart at intervals in the heat receiving chamber and the heat dissipation chamber wider than the intervals in the connecting pipes, The heat receiving chamber, the heat dissipation chamber, the connecting pipe, and the wick are integrally formed by layered manufacturing of metal powder.

[0008] The present invention also provides A heat receiving chamber; A heat dissipation chamber, a tubular connecting pipe that connects the heat receiving chamber and the heat dissipation chamber; a plurality of wicks extending inside the heat receiving chamber, the heat dissipation chamber, and the connecting pipe; The heat receiving chamber is When viewed from a first direction perpendicular to the longitudinal direction of the connecting pipe, a width of the connecting pipe in a second direction perpendicular to both the longitudinal direction and the first direction is longer than the width of the connecting pipe in the second direction, The heat dissipation chamber is When viewed from the first direction, the width in the second direction is longer than the width of the connecting pipe in the second direction, The plurality of wicks are formed side by side in at least the second direction, the wick has grooves formed on the inner wall surfaces of the heat receiving chamber, the heat dissipation chamber, and the connecting pipe; At least one of the wicks has a heat receiving chamber side bent portion that is bent in the second direction in the heat receiving chamber when viewed from the first direction, At least one of the wicks has a heat dissipation chamber side bent portion that is bent in the second direction in the heat dissipation chamber when viewed from the first direction, The wicks adjacent to each other in the second direction are spaced apart at intervals in the heat receiving chamber and the heat dissipation chamber wider than the intervals in the connecting pipes, A method for manufacturing a heat pipe in which a refrigerant flows inside the heat receiving chamber, the heat dissipation chamber, and the connecting pipe, comprising: The heat receiving chamber, the heat dissipation chamber, the connecting pipe, and the wick are integrally formed by layer-by-layer manufacturing of metal powder. [Effects of the Invention]

[0009] According to the present invention, by additive manufacturing of metal powder, the surface area of ​​the heat receiving chamber and the heat dissipation chamber can be increased while the heat receiving chamber, the heat dissipation chamber, the connecting pipe, and the wick can be molded into a single unit, thereby improving the heat exchange efficiency of the heat pipe. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 2 is a side view of the heat pipe of the embodiment. [Figure 2]FIG. 2 is a cross-sectional view taken along line AA in FIG. [Figure 3] FIG. 2 is a cross-sectional view taken along line BB in FIG. [Figure 4] FIG. 4 is an enlarged view of region C in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the heat pipe of the present invention will be described with reference to the accompanying drawings. The drawings should be viewed in accordance with the direction of the reference numerals.

[0012] Fig. 1 is a side view of a heat pipe 100 according to one embodiment of the present invention. The heat pipe 100 is a device for lowering the temperature of a local heat source (such as a computer processing unit) by transferring heat from the heat source to a heat dissipation section spaced apart from the heat source. As shown in Fig. 1, the heat pipe 100 of this embodiment includes a heat receiving chamber 120, a heat dissipation chamber 140, and a tubular connecting pipe 101 that connects the heat receiving chamber 120 and the heat dissipation chamber 140.

[0013] In this specification, for simplicity and clarity of explanation, an XYZ Cartesian coordinate system is set to indicate directions relative to the heat pipe 100. The XYZ Cartesian coordinate system includes an X axis along the width direction of the heat pipe 100, a Y axis along the longitudinal direction of the heat pipe 100 (connecting pipe 101), and a Z axis along the height direction and perpendicular to both the X and Y axes. A first direction, which will be described later, corresponds to the Z axis direction, and a second direction, which will be described later, corresponds to the X axis direction.

[0014] 2 is a cross-sectional view taken along line AA in FIG. 1, showing the interior of the connecting pipe 101. As shown in this figure, the heat pipe 100 further includes a plurality of wicks 105 extending inside the connecting pipe 101. The wicks 105 are formed around the internal space 107 of the connecting pipe 101. Each wick 105 also extends inside the heat receiving chamber 120 and the heat dissipation chamber 140.

[0015] In the heat pipe 100, a predetermined refrigerant (e.g., pure water) is sealed and flows inside the heat receiving chamber 120, the heat dissipation chamber 140, and the connecting pipe 101, which are evacuated. In the heat receiving chamber 120, which is disposed adjacent to the heat source, the refrigerant receives heat, and the vaporized refrigerant (water vapor in the case of pure water) travels at the speed of sound to the heat dissipation chamber 140, where it releases heat. The refrigerant, which has returned to a liquid state due to the release of heat, moves through the wick 105 due to the action of surface tension and returns to the heat receiving chamber 120, transferring thermal energy through this process.

[0016] 3 is a cross-sectional view taken along line BB in FIG. 1, and corresponds to a cross section of the heat pipe 100 when viewed from a first direction perpendicular to the longitudinal direction (Y-axis direction) of the connecting pipe 101, i.e., the Z-axis direction. As is clear from this figure, when viewed from the first direction perpendicular to the longitudinal direction of the connecting pipe 101, the width of the heat receiving chamber 120 in a second direction perpendicular to both the longitudinal direction of the connecting pipe 101 and the first direction, i.e., the X-axis direction, is longer than the width of the connecting pipe 101 in the second direction. In addition, the heat dissipation chamber 140 has a shape similar to that of the heat receiving chamber 120, and when viewed from the first direction, the width of the heat dissipation chamber 140 in the second direction is longer than the width of the connecting pipe 101 in the second direction.

[0017] The multiple wicks 105 are formed side by side at least in the second direction (X-axis direction). That is, as is clear from Figures 1 and 2, the overall shape of the heat pipe 100 has a flat shape with a short length in the first direction, i.e., the Z-axis direction. Therefore, by forming the multiple wicks 105 side by side at least in the second direction, it is possible to arrange a large number of wicks 105. However, in this embodiment, the wicks 105 are also formed side by side in the first direction.

[0018] The wick 105 has a groove shape formed on the inner wall surfaces of the heat receiving chamber 120, the heat dissipation chamber 140, and the connecting pipe 101. The groove shape is set to a size that allows the refrigerant to move from the heat dissipation chamber 140 through the connecting pipe 101 to the heat receiving chamber 120 by capillary action. As shown in Figure 2, in the connecting pipe 101, each wick 105 is composed of a groove formed between multiple partition walls 104 protruding from the inner wall of the connecting pipe 101 that defines the internal space 107 of the connecting pipe 101.

[0019] 4 is an enlarged view of region C in FIG. 3, and is an enlarged view of the heat dissipation chamber 140. At least one wick 105 has a heat dissipation chamber-side bent portion 142 that is bent in the second direction in the heat dissipation chamber 140 when viewed from the first direction. The heat receiving chamber 120 has a similar configuration to the heat dissipation chamber 140, and at least one wick 105 has a heat receiving chamber-side bent portion 122 (FIG. 3) that is bent in the second direction in the heat receiving chamber 120 when viewed from the first direction. As a result, the distance between adjacent wicks 105 in the second direction at the heat receiving chamber 120 and the distance between them at the heat dissipation chamber 140 are wider than the distance between them at the connecting pipe 101.

[0020] The heat receiving chamber 120, heat dissipation chamber 140, connecting pipe 101, and wick 105 are integrally manufactured using additive manufacturing (AM) technology, which allows for the production of parts with complex three-dimensional shapes by layering and solidifying metal powder material one layer at a time. This makes it possible to produce parts with intricate, three-dimensional shapes that would be difficult to produce using conventional manufacturing methods such as machining or casting.

[0021] Specifically, according to the heat pipe 100 of this embodiment, by using AM technology to additively manufacture metal powder, the surface areas of the heat receiving chamber 120 and the heat dissipation chamber 140 can be increased while the heat receiving chamber 120, the heat dissipation chamber 140, the connecting pipe 101, and the wick 105 can be molded integrally, thereby improving the heat exchange efficiency of the heat pipe.

[0022] Furthermore, since substantially all components of the heat pipe 100 can be molded integrally by additive manufacturing of metal powder using AM technology, the manufacturing process can be simplified.

[0023] As described above, the multiple wicks 105 are formed not only in the second direction but also in the first direction, and as a result, they are formed around the entire inner wall surfaces of the heat receiving chamber 120, the heat dissipation chamber 140, and the connecting pipe 101. This makes it possible to further increase the surface areas of the heat receiving chamber 120 and the heat dissipation chamber 140, thereby further improving the heat exchange efficiency of the heat pipe 100.

[0024] 4 also shows an enlarged view of region D. The heat dissipation chamber 140 is provided with a heat dissipation chamber-side partition wall 144 that protrudes from the inner wall surface and extends between adjacent wicks 105 in the second direction. The heat receiving chamber 120 has a similar configuration to the heat dissipation chamber 140, and is provided with a heat receiving chamber-side partition wall (not shown) that protrudes from the inner wall surface and extends between adjacent wicks 105 in the second direction. The heat receiving chamber-side partition wall and the heat dissipation chamber-side partition wall 144 extend integrally along the longitudinal direction (Y-axis) of the heat pipe 100 via the partition wall 104 shown in FIG. 2. However, when the heat receiving chamber-side partition wall and the heat dissipation chamber-side partition wall 144 are provided at the heat receiving chamber-side bent portion 122 and the heat dissipation chamber-side bent portion 142, the heat receiving chamber-side partition wall and the heat dissipation chamber-side partition wall 144 are also bent in the second direction together with the wicks 105. The heat receiving chamber 120, the heat dissipation chamber 140, the connecting pipe 101, the wick 105, the heat receiving chamber side partition wall, and the heat dissipation chamber side partition wall 144 are integrally formed by additive manufacturing of metal powder using AM technology.

[0025] As a result, the heat receiving chamber-side partition wall improves the rigidity of the heat receiving chamber 120 and improves the heat transfer performance of the heat receiving chamber. Similarly, the heat dissipation chamber-side partition wall 144 improves the rigidity of the heat dissipation chamber 140 and improves the heat transfer performance of the heat dissipation chamber 140. Even if the heat pipe 100 is tilted or vibrates, the heat receiving chamber-side partition wall distributes the refrigerant more uniformly within the heat receiving chamber 120, improving the heat transfer performance of the heat receiving chamber. Similarly, even if the heat pipe 100 is tilted or vibrates, the heat dissipation chamber-side partition wall 144 distributes the refrigerant more uniformly within the heat dissipation chamber 140, improving the heat transfer performance of the heat dissipation chamber 140.

[0026] In addition, in the heat dissipation chamber 140, branched grooves 146, which have straight grooves and branched grooves branching off from the straight grooves, are formed on the bottom surface of the wick 105. These branched grooves 146 are also formed in the heat receiving chamber 120. The branched grooves 146 can transport the refrigerant through the straight grooves and can be densely arranged due to the branching, thereby improving the heat exchange efficiency of the heat exchange device. Note that the groove shape is not limited to the branched grooves 146, and any groove shape can be used, such as zigzag grooves or uneven grooves.

[0027] 1, a housing forming the outer periphery of the heat dissipation chamber 140 is provided with a heat sink 148 having a plurality of fins on the outside of the heat dissipation chamber 140. The heat receiving chamber 120, the heat dissipation chamber 140, the connecting pipe 101, the wick 105, and the heat sink 148 may be integrally molded by additive manufacturing of metal powder using AM technology.

[0028] As a result, a heat sink 148 having a plurality of fins on the outside of the heat dissipation chamber 140 is integrally formed in the housing of the heat dissipation chamber 140, thereby improving the heat dissipation performance of the heat dissipation chamber 140 and improving the heat exchange efficiency of the heat exchange device.

[0029] 1, 3, and 4, the heat receiving chamber 120 and the heat dissipation chamber 140 are provided with vacuum processing units 129 and 149, respectively, on the surface opposite the connecting pipe 101. The vacuum processing units 129 and 149 are communication holes that connect the outside and the inside before sealing, and are sealed after evacuation. The vacuum processing units 129 and 149 are used, for example, when evacuating the inside by injecting a refrigerant from one side and suctioning it from the other side. The vacuum processing units 129 and 149 are preferably provided on an imaginary line that passes through the center of the connecting pipe 101 in the second direction and extends in the longitudinal direction of the heat pipe 100 (connecting pipe 101).

[0030] Furthermore, when manufacturing the heat pipe 100 using AM technology, metal powder accumulated inside is discharged through the communication holes before vacuuming. For example, water is injected from one side and the metal powder is discharged from the other side along with the water. This eliminates the need for a dedicated structure for discharging the metal powder, simplifies the structure, and reduces the number of sealing processes. Furthermore, the vacuum processing units 129, 149 can also be used in a cleaning process for the heat pipe 100 after the metal powder has been discharged, in which water is injected from one side and discharged from the other side.

[0031] Although one embodiment of the present invention has been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such an embodiment. It is clear that a person skilled in the art can conceive of various modifications or alterations within the scope of the claims, and it is understood that these also naturally fall within the technical scope of the present invention. Furthermore, the components of the above embodiment may be combined in any manner without departing from the spirit of the invention.

[0032] For example, in the present embodiment, the heat sink 148 having a plurality of fins is formed on the outside of the heat dissipation chamber 140 in the housing that forms the outer shell of the heat dissipation chamber 140, but the heat sink 148 may be omitted. Also, the heat sink 148 may be provided in the heat dissipation chamber 140 as a separate body.

[0033] This specification describes at least the following: In parentheses, components corresponding to those in the above-described embodiments are shown as examples, but the present invention is not limited to these.

[0034] (1) a heat receiving chamber (heat receiving chamber 120); a heat dissipation chamber (heat dissipation chamber 140); a tubular connecting pipe (connecting pipe 101) that connects the heat receiving chamber and the heat dissipation chamber; a plurality of wicks (wicks 105) extending through the heat receiving chamber, the heat dissipation chamber, and the connecting pipe; A heat pipe (heat pipe 100) in which a refrigerant flows through the heat receiving chamber, the heat dissipation chamber, and the connecting pipe, The heat receiving chamber is When viewed from a first direction perpendicular to the longitudinal direction of the connecting pipe, a width of the connecting pipe in a second direction perpendicular to both the longitudinal direction and the first direction is longer than the width of the connecting pipe in the second direction, The heat dissipation chamber is When viewed from the first direction, the width in the second direction is longer than the width of the connecting pipe in the second direction, The plurality of wicks are formed side by side in at least the second direction, the wick has grooves formed on the inner wall surfaces of the heat receiving chamber, the heat dissipation chamber, and the connecting pipe; At least one of the wicks has a heat receiving chamber side bent portion (heat receiving chamber side bent portion 122) bent in the second direction in the heat receiving chamber when viewed from the first direction, At least one of the wicks has a heat dissipation chamber side bent portion (heat dissipation chamber side bent portion 142) bent in the second direction in the heat dissipation chamber when viewed from the first direction, The wicks adjacent to each other in the second direction are spaced apart at intervals in the heat receiving chamber and the heat dissipation chamber wider than the intervals in the connecting pipes, The heat pipe, wherein the heat receiving chamber, the heat dissipation chamber, the connecting pipe, and the wick are integrally formed by additive manufacturing of metal powder.

[0035] According to (1), by additive manufacturing of metal powder, the surface area of ​​the heat receiving chamber and the heat dissipation chamber can be increased while the heat receiving chamber, the heat dissipation chamber, the connecting pipe, and the wick can be molded into a single unit, thereby improving the heat exchange efficiency of the heat pipe.

[0036] (2) The heat pipe according to (1), A heat pipe, wherein the plurality of wicks are formed over the entire circumference of the inner wall surfaces of the heat receiving chamber, the heat dissipation chamber, and the connecting pipe.

[0037] According to (2), the surface areas of the heat receiving chamber and the heat dissipating chamber can be further increased, further improving the heat exchange efficiency of the heat pipe.

[0038] (3) The heat pipe according to (1) or (2), The heat receiving chamber is provided with a heat receiving chamber side partition wall that protrudes from an inner wall surface and extends between the wicks adjacent to each other in the second direction, The heat dissipation chamber is provided with a heat dissipation chamber side partition wall (heat dissipation chamber side partition wall 144) that protrudes from an inner wall surface and extends between the wicks adjacent to each other in the second direction, A heat pipe in which the heat receiving chamber, the heat dissipation chamber, the connecting pipe, the wick, the heat receiving chamber side partition wall, and the heat dissipation chamber side partition wall are integrally formed by additive manufacturing of metal powder.

[0039] According to (3), the heat receiving chamber side partition wall improves the rigidity of the heat receiving chamber and improves the heat transfer performance of the heat receiving chamber. Similarly, the heat dissipation side partition wall improves the rigidity of the heat dissipation chamber and improves the heat transfer performance of the heat dissipation chamber. Furthermore, even if the heat pipe is tilted or vibrates, the heat receiving chamber side partition wall distributes the refrigerant more evenly within the heat receiving chamber, improving the heat transfer performance of the heat receiving chamber. Similarly, even if the heat pipe is tilted or vibrates, the heat dissipation side partition wall distributes the refrigerant more evenly within the heat dissipation chamber, improving the heat transfer performance of the heat dissipation chamber.

[0040] (4) A heat pipe according to any one of (1) to (3), The housing of the heat dissipation chamber is formed with a heat sink (heat sink 148) having a plurality of fins on the outside of the heat dissipation chamber, A heat exchange device, wherein the heat receiving chamber, the heat dissipation chamber, the connecting pipe, the wick, and the heat sink are integrally molded by additive manufacturing of metal powder.

[0041] According to (4), a heat sink having a plurality of fins is integrally formed on the housing of the heat dissipation chamber outside the heat dissipation chamber, thereby improving the heat dissipation performance of the heat dissipation chamber and the heat exchange efficiency of the heat exchange device.

[0042] (5) a heat receiving chamber (heat receiving chamber 120); a heat dissipation chamber (heat dissipation chamber 140); a tubular connecting pipe (connecting pipe 101) that connects the heat receiving chamber and the heat dissipation chamber; a plurality of wicks (wicks 105) extending through the heat receiving chamber, the heat dissipation chamber, and the connecting pipe; The heat receiving chamber is When viewed from a first direction perpendicular to the longitudinal direction of the connecting pipe, a width of the connecting pipe in a second direction perpendicular to both the longitudinal direction and the first direction is longer than the width of the connecting pipe in the second direction, The heat dissipation chamber is When viewed from the first direction, the width in the second direction is longer than the width of the connecting pipe in the second direction, The plurality of wicks are formed side by side in at least the second direction, the wick has grooves formed on the inner wall surfaces of the heat receiving chamber, the heat dissipation chamber, and the connecting pipe; At least one of the wicks has a heat receiving chamber side bent portion (heat receiving chamber side bent portion 122) bent in the second direction in the heat receiving chamber when viewed from the first direction, At least one of the wicks has a heat dissipation chamber side bent portion (heat dissipation chamber side bent portion 142) bent in the second direction in the heat dissipation chamber when viewed from the first direction, The wicks adjacent to each other in the second direction are spaced apart at intervals in the heat receiving chamber and the heat dissipation chamber wider than the intervals in the connecting pipes, A method for manufacturing a heat pipe (heat pipe 100) in which a refrigerant flows inside the heat receiving chamber, the heat dissipation chamber, and the connecting pipe, comprising: A method for manufacturing a heat pipe, comprising forming the heat receiving chamber, the heat dissipation chamber, the connecting pipe, and the wick integrally by additive manufacturing of metal powder.

[0043] According to (5), by additive manufacturing of metal powder, the surface area of ​​the heat receiving chamber and the heat dissipation chamber can be increased while the heat receiving chamber, the heat dissipation chamber, the connecting pipe, and the wick can be molded into a single unit, thereby improving the heat exchange efficiency of the heat pipe.

[0044] (6) A method for manufacturing a heat pipe according to (5), The heat receiving chamber and the heat dissipation chamber are integrally formed with communication holes communicating with the outside, removing the metal powder from the communicating holes; injecting the refrigerant through the communication hole and evacuating; and sealing the communication hole after the evacuation.

[0045] According to (6), by using the vacuum-drawing communication holes to discharge the remaining metal powder, there is no need to provide a dedicated structure for discharging the metal powder, which simplifies the structure and reduces the number of sealing processes. [Explanation of symbols]

[0046] 100 heat pipes 101 Connecting pipe 105 Wick 120 Heat receiving room 122 Heat receiving chamber side bending part 140 Heat radiation chamber 142 Heat radiation chamber side bending part 144 Heat dissipation room side partition wall 148 Heatsink

Claims

1. A heat receiving chamber; A heat dissipation chamber, a tubular connecting pipe that connects the heat receiving chamber and the heat dissipation chamber; a plurality of wicks extending inside the heat receiving chamber, the heat dissipation chamber, and the connecting pipe; A heat pipe in which a refrigerant flows through the heat receiving chamber, the heat dissipation chamber, and the connecting pipe, The heat receiving chamber is When viewed from a first direction perpendicular to the longitudinal direction of the connecting pipe, a width of the connecting pipe in a second direction perpendicular to both the longitudinal direction and the first direction is longer than a width of the connecting pipe in the second direction, The heat dissipation chamber is When viewed from the first direction, the width in the second direction is longer than the width of the connecting pipe in the second direction, The plurality of wicks are formed side by side in at least the second direction, the wick has grooves formed on the inner wall surfaces of the heat receiving chamber, the heat dissipation chamber, and the connecting pipe; At least one of the wicks has a heat receiving chamber side bent portion that is bent in the second direction in the heat receiving chamber when viewed from the first direction, At least one of the wicks has a heat dissipation chamber side bent portion that is bent in the second direction in the heat dissipation chamber when viewed from the first direction, The wicks adjacent to each other in the second direction are spaced apart at intervals in the heat receiving chamber and the heat dissipation chamber wider than the intervals in the connecting pipes, The heat pipe, wherein the heat receiving chamber, the heat dissipation chamber, the connecting pipe, and the wick are integrally formed by additive manufacturing of metal powder.

2. 2. The heat pipe according to claim 1, A heat pipe, wherein the plurality of wicks are formed over the entire circumference of the inner wall surfaces of the heat receiving chamber, the heat dissipation chamber, and the connecting pipe.

3. 2. The heat pipe according to claim 1, The heat receiving chamber is provided with a heat receiving chamber side partition wall that protrudes from an inner wall surface and extends between the wicks adjacent to each other in the second direction, The heat dissipation chamber is provided with a heat dissipation chamber side partition wall that protrudes from an inner wall surface and extends between the wicks adjacent to each other in the second direction, A heat pipe in which the heat receiving chamber, the heat dissipation chamber, the connecting pipe, the wick, the heat receiving chamber side partition wall, and the heat dissipation chamber side partition wall are integrally formed by additive manufacturing of metal powder.

4. A heat exchange device comprising the heat pipe according to any one of claims 1 to 3, a heat sink having a plurality of fins is formed on the housing of the heat dissipation chamber outside the heat dissipation chamber; A heat exchange device, wherein the heat receiving chamber, the heat dissipation chamber, the connecting pipe, the wick, and the heat sink are integrally molded by additive manufacturing of metal powder.

5. A heat receiving chamber; A heat dissipation chamber, a tubular connecting pipe that connects the heat receiving chamber and the heat dissipation chamber; a plurality of wicks extending inside the heat receiving chamber, the heat dissipation chamber, and the connecting pipe; The heat receiving chamber is When viewed from a first direction perpendicular to the longitudinal direction of the connecting pipe, a width of the connecting pipe in a second direction perpendicular to both the longitudinal direction and the first direction is longer than a width of the connecting pipe in the second direction, The heat dissipation chamber is When viewed from the first direction, the width in the second direction is longer than the width of the connecting pipe in the second direction, The plurality of wicks are formed side by side in at least the second direction, the wick has grooves formed on the inner wall surfaces of the heat receiving chamber, the heat dissipation chamber, and the connecting pipe; At least one of the wicks has a heat receiving chamber side bent portion that is bent in the second direction in the heat receiving chamber when viewed from the first direction, At least one of the wicks has a heat dissipation chamber side bent portion that is bent in the second direction in the heat dissipation chamber when viewed from the first direction, The wicks adjacent to each other in the second direction are spaced apart at intervals in the heat receiving chamber and the heat dissipation chamber wider than the intervals in the connecting pipes, A method for manufacturing a heat pipe in which a refrigerant flows inside the heat receiving chamber, the heat dissipation chamber, and the connecting pipe, comprising: A method for manufacturing a heat pipe, comprising forming the heat receiving chamber, the heat dissipation chamber, the connecting pipe, and the wick integrally by additive manufacturing of metal powder.

6. A method for manufacturing a heat pipe according to claim 5, The heat receiving chamber and the heat dissipation chamber are integrally formed with communication holes communicating with the outside, removing the metal powder from the communicating holes; injecting the refrigerant through the communication hole and evacuating; and sealing the communication hole after the evacuation.

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