Sheet-shaped heat pipe

Abstract

A sheet heat pipe is provided that can cool a heat source by making thermal contact with a heat source in a bent state. The sheet heat pipe (1) of the present invention includes a heat dissipation plate (2), a heat receiving plate (3), a capillary structure (4) and a flow path forming body (5). The capillary structure (4) and the flow path forming body (5) are sealed in an internal space (S1) formed between the heat dissipation plate (2) and the heat receiving plate (3). A plurality of retaining protrusions (9) protruding toward the heat receiving plate (3) are formed on the heat dissipation plate (2). A plurality of elongated holes (14) are formed on the flow path forming body (5). The heat receiving plate (3) and the capillary structure (4) abut against each other. The retaining protrusions (9) and the flow path forming body (5) abut against each other. In the internal space (S1), a first flow space (S2) is formed between adjacent retaining protrusions (9). The first flow space (S2) and the second flow space (S3) in the elongated holes (14) are three-dimensionally intersecting and connected.

Description

Technical Field

[0001] The present invention relates to a plate-shaped heat pipe mounted on a device having a heat source, which cools the heat source by being heated from the heat source and transferring heat. Background Technology

[0002] The applicant proposed a sheet-like heat pipe in Patent Document 1, which is configured to have a heat dissipation plate, a heat receiving plate, and a capillary structure housed inside.

[0003] The sheet heat pipe (1) described in Patent Document 1 forms multiple supports (11C) on a first sheet (11) by stamping and deep drawing, and uses the supports (11C) and the flat surface (12A) of a second sheet (12) to clamp the capillary structure (31) (refer to Patent Document 1). Figure 1 ).

[0004] The sheet heat pipe (1) described in Patent Document 1 cools the surface portion of the flat second sheet (12) by making it come into thermal contact with a heat source, but it is not conceived to use the sheet heat pipe (1) by bending it.

[0005] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2022-030213 Summary of the Invention

[0006] The problem that the invention aims to solve However, there are also cases where the heat source has a curved shape, such as a cylindrical shape. In order for the heated part to come into contact with such a heat source, it is desirable to use a plate heat pipe that can be bent.

[0007] Therefore, the object of the present invention is to solve the above-mentioned problems and provide a sheet heat pipe that can cool a heat source by making thermal contact with a heat source in a bent state.

[0008] Methods for solving problems The sheet-like heat pipe of the present invention is characterized by comprising a first plate, a second plate, a capillary structure, and a flow path forming body, wherein the capillary structure and the flow path forming body are enclosed in an internal space formed between the first plate and the second plate, a plurality of retaining protrusions protruding toward the second plate are formed on the first plate, a plurality of elongated holes are formed on the flow path forming body, the second plate and the capillary structure abut against each other, the retaining protrusions and the flow path forming body abut against each other, and a first flow space is formed between adjacent retaining protrusions in the internal space, and the first flow space and the second flow space in the elongated holes are three-dimensionally intersecting and communicating.

[0009] Invention Effects According to the present invention, it is possible to cool a heat source having a curved shape. Attached Figure Description

[0010] Figure 1 This is a perspective view of the heat dissipation plate side of the sheet heat pipe according to the first embodiment of the present invention.

[0011] Figure 2 This is a top view of the sheet heat pipe in this embodiment.

[0012] Figure 3 This is an exploded perspective view of the sheet heat pipe in this embodiment.

[0013] Figure 4 yes Figure 2 AA sectional view.

[0014] Figure 5 yes Figure 2 BB cross-sectional view.

[0015] Figure 6 yes Figure 2 CC section view.

[0016] Figure 7 yes Figure 2 DD sectional view.

[0017] Figure 8 This is a front view of the sheet heat pipe in this embodiment, bent and in contact with the device.

[0018] Figure 9 This is a top view illustrating the flow of the working fluid in the gas phase of the plate heat pipe in this embodiment.

[0019] Figure 10 This is a top view illustrating the flow of the working fluid in the gas phase of a modified example of the flow path formation of the sheet heat pipe according to this embodiment.

[0020] Figure 11 This is a top view illustrating the flow of the working fluid in the gas phase of another variation of the flow path formation of the sheet heat pipe according to this embodiment.

[0021] Figure 12 This is an exploded perspective view of the sheet heat pipe according to the second embodiment of the present invention.

[0022] Figure 13 This is a longitudinal sectional view illustrating the structure of the sheet heat pipe in this embodiment. Detailed Implementation

[0023] The preferred embodiments of the present invention will be described below using a sheet heat pipe (hereinafter referred to as "SHP") mounted in various devices (not shown) as an example. All the structures described below are not necessarily essential to the present invention.

[0024] Figures 1-11 SHP1 represents the first embodiment of the present invention. SHP1 is configured to have a heat dissipation plate 2 as a first plate, a heat receiving plate 3 as a second plate, a capillary structure 4, and a flow path forming body 5.

[0025] In this embodiment, the heat sink 2 and the heat receiving plate 3 are made of austenitic stainless steel. A capillary structure 4 and a flow path forming body 5 are housed (enclosed) in the internal space S1 formed by joining the outer peripheral portions of the heat sink 2 and the heat receiving plate 3. In addition to stainless steel, the heat sink 2 and the heat receiving plate 3 may also be made of an alloy with titanium and copper as the main components.

[0026] like Figures 1-3 As shown, the heat sink 2 is formed in the shape of a generally rectangular thin plate, having a heat dissipation portion 6, a joint portion 7 formed on the outer periphery of the heat dissipation portion 6, and an inclined portion 8 formed between the heat dissipation portion 6 and the joint portion 7. In addition, a plurality of retaining protrusions 9 are formed in the heat dissipation portion 6.

[0027] The heat dissipation section 6, the inclined section 8, and the retaining protrusion 9 are formed by sheet metal deep drawing. The retaining protrusion 9 is formed along the entire length of the heat dissipation section 6 in the short dimension direction, protruding towards the heat receiving plate 3, and is arranged in parallel at equal intervals. In order to fully ensure the first flow space S2 described later, the width W1 of the retaining protrusion 9 in the short dimension direction (refer to...) Figure 4 The thickness is preferably 2mm or less. The heat sink 2 is formed with the heat dissipation part 6 and the inclined part 8 bulging out. However, since multiple retaining protrusions 9 are formed in the heat dissipation part 6, as will be described later, even if the internal space S1 is evacuated, the heat sink 2 is difficult to bend.

[0028] like Figure 3 As shown, the heating plate 3 is formed in the shape of a generally rectangular thin plate. The heating plate 3 has a heating portion 10 and a joint portion 11 formed on the outer periphery of the heating portion 10 and joined to the joint portion 6 of the heat dissipation plate 2.

[0029] like Figure 4 As shown, in order to fully ensure the first flow space S2 and the second flow space S3 described later, it is preferable that the thickness D1 of the heat sink 2 and the thickness D2 of the heat receiving plate 3 are each less than 20% of the total thickness D3 of SHP1.

[0030] Mainly such as Figure 1 As shown, a nozzle portion 13 is formed in the central part of the short side portion 12 on one side of SHP1 for injecting working fluid (not shown) into the internal space S1 and evacuating the internal space S1.

[0031] like Figure 3As shown, the capillary structure 4, when viewed from above, has a shape approximately the same as the heat dissipation section 6 of the heat sink 2. To generate strong capillary forces in the liquid working fluid, the capillary structure 4 has a capillary structure with minute gaps throughout, and can utilize metal fiber capillary structures, metal fiber felt, flat meshes woven from arranged metal wires, non-woven fabrics (not shown), etc. Furthermore, by changing the thickness and length of the metal fibers, the size of the gaps can be altered, thus allowing for a wide variety of types even with metal fiber capillary structures. The same applies to metal fiber felt, meshes, and non-woven fabrics.

[0032] like Figure 3 As shown, the flow path forming body 5, when viewed from above, has a shape approximately the same as the heat dissipation portion 6 of the heat sink 2 and the capillary structure 4. Multiple elongated holes 14 extending along the longitudinal direction are formed in the flow path forming body 5. Each elongated hole 14 is a through hole, formed parallel at equal intervals. To ensure sufficient flow of the gaseous working fluid, the width W2 of the elongated holes 14 (refer to...) Figure 3 The preferred size is 0.5mm or larger.

[0033] The flow path forming body 5 in this embodiment is made of the same material as the capillary structure 4. To generate strong capillary forces in the liquid working fluid, it has a capillary structure with minute gaps throughout. Similar to the capillary structure 4, it can use a metal fiber capillary structure, metal fiber felt, a flat mesh formed by arranging and weaving metal wires in a longitudinal and transverse pattern, or non-woven fabric (not shown). Alternatively, the flow path forming body 5 can be formed of a material different from the capillary structure 4, or it can be a metal plate without a capillary structure.

[0034] As in this embodiment, when both the capillary structure 4 and the flow path forming body 5 have a capillary structure, they can be integrally formed. Furthermore, in this embodiment, the overlapping capillary structure 4 and the flow path forming body 5 are held together by the holding protrusion 9 of the heat sink 2 and the heated portion 10 of the heated plate 3. However, when the flow path forming body 5 has a capillary structure, the separate capillary structure 4 may not be used, and only the flow path forming body 5 may be held together by the holding protrusion 9 and the heated portion 10. Therefore, even when the technical solution describes having both a "capillary structure" and a "flow path forming body," sometimes the "capillary structure" and the "flow path forming body" are a single component.

[0035] In this embodiment, the heat sink 2, the heat receiving plate 3, the capillary structure 4, and the flow path forming body 5 are all made of austenitic stainless steel, which is the same type of metal material. Therefore, the changes (time-dependent changes) that occur in the heat sink 2, the heat receiving plate 3, the capillary structure 4, and the flow path forming body 5 over time are the same.

[0036] Here, a general description of the assembly method (manufacturing method) of SHP1 is given. A heat sink 2, formed by sheet metal deep drawing with a heat dissipation section 6, an inclined section 8, and a retaining protrusion 9, is positioned with its interior facing upwards. A flow path forming body 5 is placed on the heat dissipation section 6. Next, a capillary structure 4 is placed on the flow path forming body 5. Then, the heat receiving plates 3 are overlapped, and the joint 7 of the heat sink 2 is joined to the joint 11 of the heat receiving plate 3 by welding. At this time, the capillary structure 4 and the flow path forming body 5 are held by the retaining protrusion 9 of the heat sink 2 and the heat receiving section 10 of the heat receiving plate 3, and are held in a manner that prevents them from moving inside the SHP1 (see reference). Figures 4-7 Next, a working fluid such as pure water is injected into the internal space S1 through the nozzle section 13 to degas the internal space S1. Then, the base portion of the nozzle section 13 is sealed by welding, and the unwanted parts of the nozzle section 13 are cut off. Furthermore, the position and number of nozzle sections 13 can be appropriately determined considering the size and shape of the SHP1. In this embodiment, the SHP1 is used to bring the heating plate 3 into contact with a cylindrical device P having a heat source H (cooling object), therefore, as Figure 8 As shown, the SHP1 is bent to match the shape of the device P. Specifically, the short side portion 12 on one side and the short side portion 15 on the other side are bent so that the side of the heated plate 3 is the inside, and they approach each other. In addition, in this embodiment, the SHP1 is bent into an arc shape as a whole, but it is also possible to bend only a part of the SHP1 to correspond to the shape of the device P it is abutting. In this case, it is also possible to configure it so that the retaining protrusion 9 and the elongated hole 14 are not formed for the unbent part, for which the gas phase working fluid flows in the first flow space S2. In addition, by bending the short side portion 12 on one side and the short side portion 15 on the other side so that the side of the heated plate 3 is the outside, it is also possible to abut against the device P which has an arc-shaped concave surface.

[0037] Next, the function and effect of installing the SHP1 with the above structure on the device P will be explained. When the heated portion 10 of the heated plate 3 of the SHP1 comes into thermal contact with the heat source H of the installed device P, the heat from the heat source is transferred to the heated portion 10. The liquid working fluid in the capillary structure 4 and the flow path forming body 5, which are kept in the internal space S1, evaporates, and the gaseous working fluid flows toward the heat dissipation portion 6, which has a lower temperature, thus transferring heat inside the SHP1. The heat transferred to the heat dissipation portion 6 diffuses to the outside of the SHP1 and is dissipated from the SHP1. As a result, the heat source H is cooled, which can mitigate the temperature rise of the device P.

[0038] like Figure 9As shown by the dashed arrow, the gaseous working fluid flows along the short-length direction of SHP1 within the first flow space S2 formed between adjacent retaining protrusions 9 (including between the inclined portion 8 and the retaining protrusion 9). Additionally, it flows along the long-length direction of SHP1 within the second flow space S3 inside the elongated orifice 14. The first flow space S2 and the second flow space S3 are three-dimensionally interconnected, forming a lattice structure when viewed from above. Therefore, the gaseous working fluid flows within the internal space S1 in a manner that diffuses in both the short-length and long-length directions. Furthermore, Figure 9 The dashed arrow illustrates a portion of the flow of the working fluid in the gas phase.

[0039] Heat is transferred to the heat dissipation section 6, and the cooled working fluid condenses into a liquid phase. The liquid working fluid flows towards the heat source H through the strong capillary force of the capillary structure 4 and the flow path forming body 5. In this way, heat transfer is continuously achieved through the internal recirculation of the working fluid within the internal space S1. Furthermore, even in the presence of multiple heat sources H, as long as these heat sources H are thermally connected to the heat receiving section 10 of the heat receiving plate 3, cooling of multiple heat sources H is possible.

[0040] Figure 10 and Figure 11 This is a modified example of the flow path forming body 5 in the SHP1 of the first embodiment. Figure 10 An example is shown where, in top view, the flow path forming body 5 has only one elongated orifice 14 overlapping the heat source H, and no other elongated orifices 14 are formed. Thus, even with a reduced number of elongated orifices 14, the gaseous working fluid flows in the first flow space S2 and the second flow space S3, as indicated by the dashed arrows, and diffuses into the short and long dimensions of the internal space S1. As in this modified example, the number or length of the elongated orifices 14 can be varied depending on the position and size of the heat source H and the shape of SHP1. Furthermore, Figure 10 The dashed arrow illustrates a portion of the flow of the working fluid in the gas phase.

[0041] Figure 11 This is a structure in which a portion of the elongated orifice 14 is formed at an angle, and a portion of the second flow space S3 intersects the first flow space S2 at an angle. Thus, even when the portion of the second flow space S3 intersects the first flow space S2 at an angle, the gaseous working fluid flows in both the first and second flow spaces S3, as indicated by the dashed arrows, and diffuses into the short and long dimensions of the internal space S1. As in this modified example, the first and second flow spaces S2 and S3 do not necessarily need to intersect orthogonally; they can also be formed at an angle. Furthermore, Figure 11 The dashed arrow illustrates a portion of the flow of the working fluid in the gas phase.

[0042] As described above, the SHP1 of this embodiment includes a heat sink 2, a heat receiving plate 3, a capillary structure 4, and a flow path forming body 5. The capillary structure 4 and the flow path forming body 5 are enclosed in an internal space S1 formed between the heat sink 2 and the heat receiving plate 3. The heat sink 2 has multiple retaining protrusions 9 protruding towards the heat receiving plate 3, and the flow path forming body 5 has multiple elongated holes 14. The heat receiving plate 3 and the capillary structure 4 abut against each other, and the retaining protrusions 9 and the flow path forming body 5 abut against each other. A first flow space S2 is formed between adjacent retaining protrusions 9 in the internal space S1, and the first flow space S2 and a second flow space S3 within the elongated holes 14 are three-dimensionally intersecting and communicating. Therefore, even when the SHP1 is bent, the flow of the gaseous working fluid is not hindered. The gaseous working fluid flows inside the first flow space S2 and the second flow space S3, thereby enabling heat transfer in a manner that diffuses along the short and long dimensions of the SHP1.

[0043] Furthermore, in the SHP1 of this embodiment, the plurality of retaining protrusions 9 are parallel to each other, and the width W1 of the retaining protrusions 9 in the short dimension direction is 2 mm or less. Since the plurality of retaining protrusions 9 are formed parallel to each other, the plurality of first flow spaces S2 formed are also parallel, allowing the gaseous working fluid to flow in parallel. In addition, since the width W1 of the retaining protrusions 9 in the short dimension direction is short to less than 2 mm, the width of the first flow space S2 in the short dimension direction can be increased, and more first flow spaces S2 can be formed, thus ensuring the first flow spaces S2 are more secure. As a result, the total amount of gaseous working fluid that can flow inside the first flow spaces S2 can be increased.

[0044] Furthermore, in the SHP1 of this embodiment, the heat sink 2, the heat receiving plate 3, the capillary structure 4, and the flow path forming body 5 are formed from the same metal material. Therefore, the changes (time-dependent changes) that occur in the heat sink 2, the heat receiving plate 3, the capillary structure 4, and the flow path forming body 5 over time can be the same.

[0045] Furthermore, in the SHP1 of this embodiment, the plurality of elongated holes 14 are parallel to each other, and the width W2 of the elongated holes 14 in the short dimension direction is 0.5 mm or more. Therefore, the gaseous working fluid can flow in parallel using the second flow space S3. In addition, by increasing the width W2 of the elongated holes 14 in the short dimension direction, the total amount of gaseous working fluid that can flow inside the second flow space S3 can be increased.

[0046] Furthermore, in the SHP1 of this embodiment, the thickness D1 of the heat sink 2 and the thickness D2 of the heat receiving plate 3 are each less than 20% of the total thickness D3 of the sheet heat pipe 1. Therefore, the volumes of the first flow space S2 and the second flow space S3 can be increased, thereby increasing the total amount of gaseous working fluid that can flow inside.

[0047] Furthermore, in the SHP1 of this embodiment, the flow path forming body 5 has a capillary structure. Therefore, the working fluid in the liquid phase can be flowed by utilizing the capillary force generated by the flow path forming body 5.

[0048] Figure 12 and Figure 13 SHP21 represents the second embodiment of the present invention. SHP21 is configured to have a heat dissipation plate 22 as a first plate, a heat receiving plate 23 as a second plate, a capillary structure 24 housed inside, a flow path forming body 25, a one-side reinforcing member 26, and a other-side reinforcing member 27.

[0049] In this embodiment, the heat sink 22 and the heat receiving plate 23 are made of austenitic stainless steel. A capillary structure 24, a flow path forming body 25, a one-sided reinforcing member 26, and a other-sided reinforcing member 27 are housed (enclosed) within an internal space S4 formed by joining the outer peripheries of the heat sink 22 and the heat receiving plate 23. Alternatively, the heat sink 22 and the heat receiving plate 23 may also be made of an alloy primarily composed of titanium or copper, in addition to stainless steel.

[0050] like Figure 12 As shown, the heat sink 22 is formed in the shape of a generally rectangular thin plate, having a heat dissipation portion 28, a joint portion 29 formed on the outer periphery of the heat dissipation portion 28, and an inclined portion 30 formed between the heat dissipation portion 28 and the joint portion 29. In addition, a plurality of retaining protrusions 31 are formed in the heat dissipation portion 28.

[0051] The heat dissipation section 28, the inclined section 30, and the retaining protrusion 31 are formed by sheet metal deep drawing. The retaining protrusion 31 is formed along the entire length of the heat dissipation section 28 in the longitudinal direction, and each retaining protrusion 31 protrudes towards the heat receiving plate 23 and is arranged in parallel at equal intervals. In order to fully ensure the first flow space S5 described later, the width W3 of the retaining protrusion 31 in the short dimension direction (refer to...) Figure 13 The thickness is preferably 2mm or less. The heat sink 22 is formed in such a way that the heat dissipation part 28 and the inclined part 30 bulge out. However, since multiple retaining protrusions 31 are formed in the heat dissipation part 28, as will be described later, even if the internal space S4 is evacuated, the heat sink 22 is difficult to bend.

[0052] The heat-receiving plate 23 is formed in the shape of a generally rectangular thin plate. The heat-receiving plate 23 has a heat-receiving portion 32, a joint portion 33 formed on the outer periphery of the heat-receiving portion 32 and joined with the joint portion 29 of the heat-dissipating plate 22, and an inclined portion 34 formed between the heat-receiving portion 32 and the joint portion 33. The heat-receiving portion 32 and the inclined portion 34 are formed by sheet metal deep drawing to protrude in the opposite direction to the heat-dissipating plate 22.

[0053] like Figure 13 As shown, in order to fully ensure the first flow space S5 and the second flow space S6, it is preferable that the thickness D4 of the heat sink 22 and the thickness D5 of the heat receiving plate 33 are each less than 20% of the total thickness D6 of SHP21.

[0054] The SHP21 has a nozzle 36 formed in the central part of the short side 35 on one side for injecting working fluid (not shown) into the internal space S4 and evacuating the internal space S4.

[0055] The capillary structure 24 is formed in the shape of a rectangular thin plate. To generate strong capillary forces in the working fluid of the liquid phase, the capillary structure 24 has a capillary structure with minute gaps throughout without any omissions. It can be made of metal fiber capillary structures, metal fiber felt, a flat mesh woven with metal wires arranged in a longitudinal and transverse pattern, or nonwoven fabric (not shown). Furthermore, by changing the thickness and length of the metal fibers, the size of the gaps can be changed, so even metal fiber capillary structures can be of various types. The same applies to metal fiber felt, mesh, and nonwoven fabric.

[0056] The flow path forming body 25 has a rectangular thin plate shape and is formed with a plurality of elongated holes 37 extending along the longitudinal direction. Each elongated hole 37 is a through hole and is formed in parallel at equal intervals. To ensure sufficient flow of the working fluid in the gas phase, the width W4 of the elongated hole 37 in the short dimension direction (refer to...) Figure 12 The preferred size is 0.5mm or larger.

[0057] In this embodiment, the flow path forming body 25 is made of the same material as the capillary structure 24. To generate strong capillary forces in the liquid working fluid, it has a capillary structure with minute gaps throughout. Similar to the capillary structure 4, it can use a metal fiber capillary structure, metal fiber felt, a flat mesh formed by arranging and weaving metal wires, or non-woven fabric (not shown). Alternatively, the flow path forming body 25 can be formed of a material different from the capillary structure 24, or it can be a metal plate without a capillary structure.

[0058] As in this embodiment, when the capillary structure 24 and the flow path forming body 25 both have capillary structures, they can be integrally formed. Furthermore, in this embodiment, the overlapping capillary structure 24 and the flow path forming body 25 are held together by the holding protrusion 31 of the heat sink 22 and the heated portion 32 of the heated plate 23. However, when the flow path forming body 25 has a capillary structure, the separate capillary structure 24 may not be used, and only the flow path forming body 25 may be held together by the holding protrusion 31 and the heated portion 32. Therefore, even when the technical solution describes having both a "capillary structure" and a "flow path forming body," sometimes the "capillary structure" and the "flow path forming body" are a single component.

[0059] In this embodiment, the heat sink 22, the heat receiving plate 23, the capillary structure 24, and the flow path forming body 25 are all made of austenitic stainless steel, which is the same type of metal material. Therefore, the changes (time-dependent changes) that occur in the heat sink 22, the heat receiving plate 23, the capillary structure 24, and the flow path forming body 25 over time can be the same.

[0060] The one-sided reinforcing member 26 and the other-sided reinforcing member 27 are formed of metals with high thermal conductivity, such as copper or copper alloys, and have an elongated cuboid shape. The one-sided reinforcing member 26 and the other-sided reinforcing member 27 are of the same shape. Conventionally, sheet-like heat pipes (not shown) without reinforcing members such as the one-sided reinforcing member 26 and the other-sided reinforcing member 27 will experience unintended warping of the heat sink, heat receiving plate, etc., during the manufacturing process, thus requiring heat treatment to improve the warping process. However, in this embodiment, by providing the one-sided reinforcing member 26 and the other-sided reinforcing member 27 in the internal space S4, the occurrence of unintended warping of components such as the heat sink 22 and the heat receiving plate 23 is suppressed.

[0061] Here, a general description of the assembly method (manufacturing method) of SHP21 is given. A heated plate 23, formed by sheet metal deep drawing with a heated portion 32 and an inclined portion 34, is positioned with its interior facing upwards. A one-sided reinforcing member 26 and a other-sided reinforcing member 27 are placed on the heated portion 32. The one-sided reinforcing member 26 is positioned along the inclined portion 34 on one side of the long side 38 of SHP21, and the other-sided reinforcing member 27 is positioned along the inclined portion 34 on the other side of the long side 39 of SHP21. Next, a capillary structure 24 is placed on the heated portion 32. At this time, the capillary structure 24 is positioned between the one-sided reinforcing member 26 and the other-sided reinforcing member 27. Next, a flow path forming body 25 is placed on the capillary structure 24. The capillary structure 24 and the flow path forming body 25 are positioned so as not to overlap with the one-sided reinforcing member 26 and the other-sided reinforcing member 27. Next, the heat sinks 22 are overlapped, and the joint 29 of the heat sink 22 is joined to the joint 33 of the heat receiving plate 23 by welding. At this time, the capillary structure 24 and the flow path forming body 25 are held by the holding protrusion 31 of the heat sink 22 and the heat receiving part 32 of the heat receiving plate 23, and are held so as not to move inside the SHP21. Next, a working fluid such as pure water is injected into the internal space S4 from the nozzle part 36 to degas the internal space S4. Then, the base part of the nozzle part 36 is sealed by welding, and the unwanted part of the nozzle part 36 is cut off. In addition, the position and number of the nozzle parts 36 can be appropriately determined considering the size and shape of the SHP21. In this embodiment, the SHP21 is used to abut against the cylindrical device P which has a heat source H (cooling object), and is therefore bent to match the shape of the device P. Specifically, one long side 38 and the other long side 39 are bent in a way that brings them closer together, with the side of the heat receiving plate 23 being the inside. Furthermore, in this embodiment, the SHP21 is bent into an arc shape as a whole, but it is also possible to bend only a portion of the SHP21 to correspond to the shape of the abutting device P. In this case, it is also possible to configure the portion without bending, without forming the retaining protrusion 31 and the elongated hole 37, for which the gaseous working fluid flows within the first flow space S5. Alternatively, by bending one short side 38 and the other short side 39 in a manner that brings them close to each other with the heated plate 23 side facing outwards, it is also possible to abut against the device P which has an arc-shaped concave surface.

[0062] Next, the function and effect of installing the SHP21 with the above structure in the equipment will be explained. When the heated portion 32 of the heated plate 23 of the SHP21 comes into contact with the heat source H of the installed equipment P, the heat from the heat source is transferred to the heated portion 32. The liquid working fluid in the capillary structure 24 and the flow path forming body 25, which are held in the internal space S4, evaporates, and the gaseous working fluid flows toward the heat dissipation portion 28, which has a lower temperature, thus transferring heat inside the SHP21. The heat transferred to the heat dissipation portion 28 diffuses to the outside of the SHP21 and is dissipated from the SHP21. As a result, the heat source H is cooled, which can mitigate the temperature rise of the equipment P.

[0063] The gaseous working fluid flows along the longitudinal direction of SHP21 within the flow space S5 formed between adjacent retaining protrusions 31. Additionally, it flows along the short-length direction of SHP21 within the flow space S6 within the fine holes 37. That is, the flow spaces S5 and S6 of the gaseous working fluid appear as a grid when viewed from above and below. Therefore, the gaseous working fluid flows within the internal space S4 in a manner that diffuses along both the short and longitudinal directions.

[0064] Heat is transferred to the heat dissipation section 28, and the cooled working fluid condenses into a liquid phase. The liquid working fluid flows towards the heat source H through the strong capillary force of the capillary structure 24 and the flow path forming body 25. In this way, heat transfer is continuously achieved through the internal recirculation of the working fluid within the internal space S4. Furthermore, even in the presence of multiple heat sources H, as long as these heat sources H are thermally connected to the heat receiving section 32 of the heat receiving plate 23, cooling of multiple heat sources H is possible.

[0065] As described above, the SHP21 of this embodiment includes a heat sink 22, a heat receiving plate 23, a capillary structure 24, and a flow path forming body 25. The capillary structure 24 and the flow path forming body 25 are enclosed in an internal space S4 formed between the heat sink 22 and the heat receiving plate 23. Multiple retaining protrusions 31 protruding towards the heat receiving plate 23 are formed on the heat sink 22, and multiple elongated holes 37 are formed on the flow path forming body 25. The heat receiving plate 23 and the capillary structure 24 abut against each other, and the retaining protrusions 31 and the flow path forming body 25 abut against each other. A first flow space S5 is formed between adjacent retaining protrusions 31 in the internal space S4, and the first flow space S5 and a second flow space S6 within the elongated holes 37 are three-dimensionally intersecting and communicating. Therefore, even when the SHP21 is bent, the flow of the gaseous working fluid is not hindered. The gaseous working fluid flows inside the first flow space S5 and the second flow space S6, thereby enabling heat transfer in a manner that diffuses along the short and long dimensions of the SHP21.

[0066] Furthermore, in this embodiment, the plurality of retaining protrusions 31 of the SHP21 are parallel to each other, and the width W3 of the retaining protrusions 31 in the short dimension direction is 2 mm or less. Since the plurality of retaining protrusions 31 are formed parallel to each other, the plurality of first flow spaces S5 formed are also parallel, allowing the gaseous working fluid to flow in parallel. In addition, since the width W3 of the retaining protrusions 31 in the short dimension direction is short to less than 2 mm, the width of the first flow space S5 in the short dimension direction can be increased, allowing for the formation of more first flow spaces S5, thus ensuring greater security of the first flow spaces S5. As a result, the total amount of gaseous working fluid that can flow inside the first flow spaces S5 can be increased.

[0067] Furthermore, in the SHP21 of this embodiment, the heat sink 22, the heat receiving plate 23, the capillary structure 24, and the flow path forming body 25 are formed of the same metal material. Therefore, it is possible to make the changes (time-dependent changes) of the heat sink 22, the heat receiving plate 23, the capillary structure 24, and the flow path forming body 25 the same over time.

[0068] Furthermore, in this embodiment, the multiple elongated holes 37 of the SHP21 are parallel to each other, and the width W4 of the elongated holes 37 in the short dimension direction is 0.5 mm or more. Therefore, the gaseous working fluid can flow in parallel using the second flow space S6. In addition, by increasing the width W4 of the elongated holes 37 in the short dimension direction, the total amount of gaseous working fluid that can flow inside the second flow space S6 can be increased.

[0069] Furthermore, in this embodiment, the thickness D4 of the heat sink 22 and the thickness D5 of the heat receiving plate 23 of the SHP21 are both less than 20% of the total thickness D6 of the SHP21. Therefore, the volumes of the first flow space S5 and the second flow space S6 can be increased, thereby increasing the total amount of gaseous working fluid that can flow inside.

[0070] Furthermore, in the SHP21 of this embodiment, the flow path forming body 25 has a capillary structure. Therefore, the working fluid in the liquid phase can be flowed by utilizing the capillary force generated by the flow path forming body 25.

[0071] Furthermore, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention. For example, the shapes of SHP1 and 21 can be set to other shapes that correspond to the location of the heat source H of the device P on which SHP1 and 21 are mounted and the configuration of the surrounding components.

[0072] Explanation of reference numerals in the attached figures 1 SHP (Flat Heat Pipe) 2. Heat sink (first plate) 3. Heating plate (second plate) 4. Capillary Structure 5 Flow path forming body 9 Keep the convex part 14 long holes 21 SHP (Flat Heat Pipe) 22 Heatsink (First Plate) 23 Heating plate (second plate) 24 Capillary Structures 25 Flow path forming body 31 Keep the convex part 37 long holes D1 Thickness of heat sink 2 (thickness of the first plate) D2 Thickness of heating plate 3 (thickness of the second plate) Total thickness of D3 SHP1 (total thickness of the sheet heat pipe) The thickness of heat sink 22 (the thickness of the first plate). D5 Thickness of the heating plate 23 (thickness of the second plate) Total thickness of D6 SHP21 (total thickness of the sheet heat pipe) S1 interior space S2 First Flow Space S3 Second Flow Space S4 interior space S5 First Flow Space S6 Second Flow Space W1 maintains the width of the protrusion 9 in the short dimension direction (maintain the width of the protrusion in the short dimension direction). W2 Width in the short dimension direction of the elongated hole 14 (width in the short dimension direction of the elongated hole) W3 maintains the width of the protrusion 31 in the short dimension direction (maintains the width of the protrusion in the short dimension direction). W4 Width of the elongated hole 37 in the short dimension direction (width of the elongated hole in the short dimension direction)

Claims

1. A plate-shaped heat pipe, characterized in that, have: First board; Second board; Capillary structure; as well as flow path forming body, The capillary structure and the flow path forming body are enclosed in the internal space formed between the first plate and the second plate. The first plate has a plurality of retaining protrusions that project toward the second plate. The flow path forming body has multiple elongated holes. The second plate abuts against the capillary structure. The retaining protrusion abuts against the flow path forming body. Within the internal space, a first flow space is formed between adjacent retaining protrusions. The first flow space is in three-dimensional intersecting communication with the second flow space within the elongated hole.

2. The sheet-like heat pipe according to claim 1, characterized in that, The plurality of retaining protrusions are parallel to each other. The width of the retaining protrusion in the short dimension direction is less than 2 mm.

3. The sheet-like heat pipe according to claim 1, characterized in that, The first plate, the second plate, the capillary structure, and the flow path forming body are all made of the same metallic material.

4. The sheet-like heat pipe according to claim 1, characterized in that, The plurality of elongated holes are parallel to each other. The width of the elongated hole in the shorter dimension direction is 0.5 mm or more.

5. The sheet-like heat pipe according to claim 1, characterized in that, The thickness of the first plate and the thickness of the second plate are each less than 20% of the total thickness of the sheet heat pipe.

6. The sheet-like heat pipe according to claim 1, characterized in that, The flow path forming body has a capillary structure.

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