Flexible heat pipe and heat dissipation device

Abstract

The utility model discloses a flexible heat pipe and a heat dissipation device. The flexible heat pipe comprises a shell, the shell comprises an evaporation section shell, a heat insulation section shell and a condensation section shell which are sequentially connected, and the heat insulation section shell has flexibility; the first capillary structure layer is arranged in the inner cavity of the shell, the first capillary structure layer has flexibility, the first capillary structure layer is provided with a plurality of bent parts which are connected end to end, and the bent parts are located in the heat insulation section shell; the second capillary structure layer is arranged on the inner wall of the evaporation section shell, and the second capillary structure layer covers at least part of the inner wall of the evaporation section shell; the third capillary structure layer is arranged on the inner wall of the condensation section shell, and the third capillary structure layer covers at least part of the inner wall of the condensation section shell; the two ends of the first capillary structure layer are connected to the second capillary structure layer and the third capillary structure layer respectively. According to the heat dissipation device, the eccentricity condition of the device can be reduced, the bending resistance of the flexible heat pipe is good, and the reliability of the device is improved.

Description

Technical Field

[0001] The present application relates to the technical field of heat dissipation equipment, and in particular to a flexible heat pipe and a heat dissipation device. Background Art

[0002] As the functional requirements of communication equipment gradually increase, the power consumption of devices in the equipment has increased significantly. For example, the power consumption of the main chip of the switch has gradually evolved and will exceed 1000W. This poses a great challenge to the heat dissipation of the device.

[0003] At present, the heat dissipation of heat source devices mainly adopts a high-performance vapor chamber (VC) combined with fins as a heat dissipation structure. The steam chamber and fins are used to evenly distribute the heat of the heat source device, and the heat conducted to the fins is taken away by forced convection wind. As the power consumption of the chip increases further, it is necessary to increase the convection heat exchange area on the wind side. Due to the limited space around the heat source device in the equipment, there is no space to further expand the size of the heat exchange area. A feasible structure is to use a heat pipe to extend part of the heat outside the steam chamber area to form a remote heat dissipation structure. However, under the influence of the rigid structure of the heat pipe, the weight of the heat pipe in the area away from the heat source device is heavier, which will cause problems such as eccentricity of the heat dissipation structure, affect the contact reliability between the heat dissipation structure and the heat source and the reliability of the heat dissipation structure itself, and have an adverse effect on the heat dissipation of the equipment. Utility Model Content

[0004] The flexible heat pipe and heat dissipation device provided in the present application reduce the rigidity of the heat pipe, improve the eccentricity of the heat dissipation device, and have good bending resistance, thereby improving the reliability of the equipment.

[0005] In a first aspect, the present application provides a flexible heat pipe, comprising: a shell having an inner cavity, the shell comprising an evaporation section shell, an insulation section shell and a condensation section shell connected in sequence, the insulation section shell being flexible; a first capillary structure layer, arranged in the inner cavity, the first capillary structure layer being flexible, and the first capillary structure layer having a plurality of bending portions connected end to end, the bending portions being located in the insulation section shell; a second capillary structure layer, arranged on the inner wall of the evaporation section shell, the second capillary structure layer covering at least a portion of the inner wall of the evaporation section shell; a third capillary structure layer, arranged on the inner wall of the condensation section shell, the third capillary structure layer covering at least a portion of the inner wall of the condensation section shell; the two ends of the first capillary structure layer are respectively connected to the second capillary structure layer and the third capillary structure layer.

[0006] The insulating section shell is set as a flexible shell to overcome the problem that the rigid heat pipe is heavier in the area far from the heat source device, which causes the heat dissipation structure to be eccentric. In addition, the flexibility of the first capillary structure layer enables the first capillary structure layer to bend with the insulating section shell, and its outer corrugated surface makes the first capillary structure layer less likely to be damaged by bending, thereby improving the reliability of the flexible heat pipe and being adaptable to the internal space structure of various devices.

[0007] In one embodiment, the first capillary structure layer and at least a portion of the second capillary structure layer are stacked along the radial direction of the shell; and the first capillary structure layer and at least a portion of the third capillary structure layer are stacked along the radial direction of the shell.

[0008] In one embodiment, the flexible heat pipe further includes a first pressing member, which is disposed in the evaporation section shell and is used to press the first capillary structure layer against the second capillary structure layer.

[0009] In one embodiment, the flexible heat pipe further includes a second pressing member, which is disposed in the condensation section shell, and is used to press the first capillary structure layer against the third capillary structure layer.

[0010] In one embodiment, the insulation section shell is a bellows.

[0011] In one embodiment, the outer surface of the evaporator section shell includes a first planar portion.

[0012] In one embodiment, the outer surface of the condensing section shell includes a second planar portion.

[0013] In one embodiment, the first capillary structure layer is a metal fiber mesh layer or a metal mesh layer; the second capillary structure layer is a sintered metal powder layer, a metal sintered mesh layer or a metal fiber mesh layer; the third capillary structure layer is a sintered metal powder layer, a metal sintered mesh layer or a metal fiber mesh layer.

[0014] In one embodiment, the outer wall of the condensation section shell is provided with at least one fin.

[0015] In a second aspect, the present application further provides a heat dissipation device, comprising a radiator, a cold source and the above-mentioned flexible heat pipe, wherein the radiator is connected to the evaporation section shell, and the cold source is connected to the condensation section shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of a flexible heat pipe in one embodiment of the present application;

[0017] Figure 2This is a schematic structural diagram of a flexible heat pipe in another embodiment of the present application;

[0018] Figure 3 This is a schematic structural diagram of a flexible heat pipe in another embodiment of the present application;

[0019] Figure 4 This is a schematic structural diagram of a flexible heat pipe in another embodiment of the present application;

[0020] Figure 5 This is a schematic structural diagram of a flexible heat pipe in another embodiment of the present application;

[0021] Figure 6 A cross-sectional view of an evaporation section shell, a first capillary structure layer, and a second capillary structure layer in one embodiment of the present application;

[0022] Figure 7 It is a cross-sectional view of a condensation section shell, a first capillary structure layer, and a third capillary structure layer in one embodiment of the present application;

[0023] Figure 8 A cross-sectional view of an evaporation section shell, a first capillary structure layer, and a second capillary structure layer in another embodiment of the present application;

[0024] Fig. 9 It is a cross-sectional view of a condensation section shell, a first capillary structure layer, and a third capillary structure layer in another embodiment of the present application;

[0025] Fig.10 A cross-sectional view of an evaporation section shell, a first capillary structure layer, and a second capillary structure layer in another embodiment of the present application;

[0026] Fig.11 It is a cross-sectional view of a condensation section shell, a first capillary structure layer, and a third capillary structure layer in another embodiment of the present application;

[0027] Fig.12 A cross-sectional view of an evaporation section shell, a first capillary structure layer, and a second capillary structure layer in another embodiment of the present application;

[0028] Fig.13 It is a cross-sectional view of a condensation section shell, a first capillary structure layer, and a third capillary structure layer in another embodiment of the present application;

[0029] Fig.14 It is a schematic structural diagram of a heat dissipation device in one embodiment of the present application.

[0030] Reference numerals:

[0031] 1-evaporation section shell; 2-insulation section shell; 3-condensation section shell; 4-first capillary structure layer; 5-second capillary structure layer; 6-third capillary structure layer; 51-first pressing member; 61-second pressing member; 11-first plane part; 31-second plane part; 7-fins; 101-heat sink; 102-cold source; 200-heating device. DETAILED DESCRIPTION

[0032] In order to solve the problem that the heat pipe is heavy in the area far from the heat source device, which causes the heat dissipation structure to be eccentric. The embodiment of the present application provides a flexible heat pipe and a heat dissipation device. In order to make the purpose, technical solution and advantages of the present application clearer, the present application is further described in detail with reference to the accompanying drawings.

[0033] The present application provides a flexible heat pipe and heat dissipation device, which ensures the performance of the heat pipe, reduces the rigidity influence of the heat pipe, reduces or even eliminates the eccentric force of the heat dissipation device, and improves the reliability of the installation of the overall remote heat dissipation structure.

[0034] Figure 1 FIG. 1 is a schematic diagram of the structure of a flexible heat pipe in one embodiment of the present application. Figure 1 As shown, a flexible heat pipe provided by the present application includes a shell, a first capillary structure layer 4, a second capillary structure layer 5 and a third capillary structure layer 6. The shell includes an evaporation section shell 1, an insulation section shell 2 and a condensation section shell 3 connected in sequence. Among them, the insulation section shell 2 is flexible so that the shell can be bent. The shell has an inner cavity, and the first capillary structure layer 4 is arranged in the inner cavity. The first capillary structure layer 4 is flexible, and the first capillary structure layer 4 has a plurality of bending portions connected end to end, and the plurality of bending portions are located in the insulation section shell 2. When the flexible heat pipe is bent, the first capillary structure layer 4 can be bent together with the insulation section shell 2. The bending portion of the first capillary structure layer 4 can be contracted or expanded to adapt to the change in bending length. After several bends, it can still maintain good performance and reduce the breakage of the first capillary structure layer 4. The second capillary structure layer 5 is arranged on the inner wall of the evaporation section shell 1, and the second capillary structure layer 5 covers at least part of the inner wall of the evaporation section shell 1. The third capillary structure layer 6 is arranged on the inner wall of the condensation section housing 3, and the third capillary structure layer 6 covers at least a portion of the inner wall of the condensation section housing 3. The two ends of the first capillary structure layer 4 are respectively connected to the first capillary structure layer 4 and the second capillary structure layer 5, and the first capillary structure layer 4, the second capillary structure layer 5 and the third capillary structure layer 6 form a liquid closed loop reflux path.

[0035] In the above embodiment, a liquid working medium is arranged in the shell, and the second capillary structure layer 5 is used to absorb the liquid working medium. When the temperature of the evaporation section shell 1 rises to a threshold value, the liquid working medium in the second capillary structure layer 5 is transformed into a gaseous working medium, flows from the porous structure of the second capillary structure layer 5 into the inner cavity of the evaporation section shell 1, and flows toward the condensation section shell 3 with a lower temperature. Since the temperature of the condensation section shell 3 is relatively low, the gaseous working medium is transformed into a liquid working medium again and falls into the third capillary structure layer 6, and is absorbed by the third capillary structure layer 6. Then it flows back to the second capillary structure layer 5 through the first capillary structure layer 4. The above evaporation and condensation process realizes the transfer of heat. The insulation section shell 2 is configured to be flexible so that the shell of the heat pipe can be bent, which overcomes the problem that the rigid heat pipe cannot be bent, so that the area away from the heat source device is heavier, resulting in an eccentric heat dissipation structure. In addition, the flexible nature of the first capillary structure layer 4 enables the first capillary structure layer 4 to be bent along with the insulation section housing 2, and the multiple bending portions located in the insulation section housing 2 are connected end to end to form a wavy or serrated capillary structure layer, so that the bending portion of the first capillary structure layer 4 can maintain its elasticity and ductility between its two ends when bending. Thus, it can adapt to the length change of the bending surface of the first capillary structure layer 4 caused by bending. Compared with the capillary structure layer without a bending portion, the bent surface of this wavy or serrated capillary structure layer is not easy to break or tear due to excessive tension when bending. Multiple bending portions make the first capillary structure layer 4 have better elasticity, and will not break or deform when subjected to external force, twisting and bending. Multiple bending portions also make the first capillary structure layer 4 have a longer service life, thereby improving the reliability of the flexible heat pipe, and can be adapted to the internal space structure of a variety of equipment.

[0036] The first capillary structure layer 4 may penetrate the evaporation section shell 1 , the insulation section shell 2 and the condensation section shell 3 , or may be located only in the insulation section shell 2 .

[0037] In one embodiment, a gap may exist between the first capillary structure layer 4 and the inner wall of the thermal insulation section shell 2 .

[0038] Figure 2 FIG. 1 is a schematic diagram of the structure of a flexible heat pipe in another embodiment of the present application. Figure 2As shown, in one embodiment, the first capillary structure layer 4 and at least a part of the second capillary structure layer 5 are stacked along the radial direction of the shell. In this way, the contact area between the first capillary structure layer 4 and the second capillary structure layer 5 can be increased to reduce the resistance when the working fluid flows, thereby accelerating the flow rate of the working fluid. Similarly, the first capillary structure layer 4 and at least a part of the third capillary structure layer 6 are stacked along the radial direction of the shell, which increases the contact area between the first capillary structure layer 4 and the third capillary structure layer 6. It is worth noting that the shell of the above-mentioned flexible heat pipe is a long tubular shell, and the axial direction of the shell refers to the extension direction of the shell, that is, the direction of the length of the shell; the radial direction of the shell refers to the direction perpendicular to the axis of the shell, that is, the thickness direction of the shell.

[0039] In the above embodiment, the first capillary structure layer 4 is inserted into the shell, and the first capillary structure layer 4 in the evaporation section shell 1 and the condensation section shell 3 are both relatively flat structures, and only the part located in the insulation section shell 2 has a bending portion. In other words, the part where the first capillary structure layer 4 and the second capillary structure layer 5 are stacked is not provided with a bending portion, so that the first capillary structure layer 4 and the second capillary structure layer 5 can fit closely together, reducing the flow resistance of the working fluid. Similarly, the part where the first capillary structure layer 4 and the third capillary structure layer 6 are stacked is not provided with a bending portion, so that the first capillary structure layer 4 and the third capillary structure layer 6 can fit closely together, reducing the flow resistance of the working fluid.

[0040] Figure 3 FIG. 1 is a schematic diagram of the structure of a flexible heat pipe in another embodiment of the present application. Figure 3 As shown, in a specific embodiment, the portion of the first capillary structure layer 4 located in the evaporation section shell 1 along the axial direction of the shell can be consistent with the length of the second capillary structure layer 5, so that the first capillary structure layer 4 and the second capillary structure layer 5 have a larger contact area, thereby reducing the resistance to the flow of the working medium. Similarly, the portion of the first capillary structure layer 4 located in the condensation section shell 3 can be consistent with the length of the third capillary structure layer 6, so that the first capillary structure layer 4 and the third capillary structure layer 6 have a larger contact area, thereby reducing the resistance to the flow of the working medium.

[0041] Please continue to refer to Figure 3In one embodiment, the flexible heat pipe further comprises a first pressing member 51 disposed in the evaporation section housing 1, and the first pressing member 51 is used to press the first capillary structure layer 4 against the second capillary structure layer 5. Specifically, the first pressing member 51 is disposed on the side of the first capillary structure layer 4 away from the second capillary structure layer 5, and the first pressing member 51 can be a spring, one end of which is connected to the inner wall of the evaporation section housing 1, and the other end is connected to the first capillary structure layer 4, and a pre-tightening force is applied to the first capillary structure layer 4, so that the first capillary structure layer 4 is always tightly fitted with the second capillary structure layer 5, so that the first capillary structure layer 4 and the second capillary structure layer 5 are kept in communication.

[0042] In another embodiment, the flexible heat pipe may further include a second pressing member 61, which is disposed in the condensing section housing 3. The second pressing member 61 is used to press the first capillary structure layer 4 against the third capillary structure layer 6. Specifically, the first capillary structure layer 4 is on the side away from the third capillary structure layer 6, and the second pressing member 61 may be a spring, one end of which is connected to the inner wall of the condensing section housing 3, and the other end is connected to the first capillary structure layer 4, and a pre-tightening force is applied to the first capillary structure layer 4, so that the first capillary structure layer 4 is always tightly fitted with the third capillary structure layer 6, so that the first capillary structure layer 4 and the third capillary structure layer 6 remain connected.

[0043] In other embodiments, the second capillary structure layer 5 and the third capillary structure layer 6 can be respectively connected to the first capillary structure layer 4 by welding or secondary high-temperature sintering. When the above connection methods are adopted, the first pressing member 51 and the second pressing member 61 may not be provided.

[0044] Please continue to refer to Figure 3 In order to keep the flexible heat pipe in full contact with the heating device, in one embodiment, the outer surface of the evaporation section shell 1 includes a first planar portion 11. Specifically, the heating device may be, for example, a radiator, the surface of which is a plane, and the first planar portion 11 can be well fitted with the surface of the radiator, so that the contact area between the two is larger, thereby improving the heat transfer efficiency between the heating device and the evaporation section shell 1. The radial cross-section of the evaporation section shell 1 may be rectangular, triangular, trapezoidal or D-shaped, etc., and this application does not impose any specific restrictions.

[0045] In another embodiment, the condensing section shell 3 can be used to contact a cold source, which can be a cold plate. The outer surface of the condensing section shell 3 includes a second planar portion 31, and the surface of the cold plate is also a plane. The second planar portion 31 can better fit the surface of the cold plate to increase the contact area, thereby improving the heat transfer efficiency between the condensing section shell 3 and the cold source and promoting the cooling of the heating components. The radial cross-section of the condensing section shell 3 can be rectangular, triangular, trapezoidal or D-shaped, etc., and this application does not make specific restrictions.

[0046] Figure 4 FIG. 1 is a schematic diagram of the structure of a flexible heat pipe in another embodiment of the present application. Figure 4 As shown, in another embodiment, the heat insulating section housing 2 may be a bellows. The first capillary structure layer 4 may be attached to the inner wall of the heat insulating section housing 2, and the corrugated surface of the first capillary structure layer 4 is the same as the corrugation of the bellows.

[0047] In order to achieve a better heat dissipation effect, in one embodiment, the thickness a of the second capillary structure layer 5 along the radial direction of the shell satisfies a>0.5mm. The thickness b of the third capillary structure layer 6 along the radial direction of the shell satisfies b>0.5mm. The thickness a of the second capillary structure layer 5 and the thickness b of the third capillary structure layer 6 are not limited to the above-defined size ranges, but can also be determined according to the size of the flexible heat pipe shell or the heat dissipation requirements, and this application does not make specific restrictions.

[0048] Figure 5 FIG. 1 is a schematic diagram of the structure of a flexible heat pipe in another embodiment of the present application. Figure 5 As shown, in one embodiment, the outer wall of the condensing section shell 3 is provided with at least one fin 7. The at least one fin 7 is arranged at intervals along the extension direction of the condensing section shell 3. The fin 7 increases the outer surface area of ​​the condensing section shell 3 in disguised form. When the heat is dissipated by forced convection wind, the condensing section shell 3 can be cooled faster, thereby improving the heat dissipation efficiency of the flexible heat pipe.

[0049] In one embodiment, the material of the second capillary structure layer 5 and the third capillary structure layer 6 can be the same, and can be a porous structure layer formed by sintering metal powder, a metal sintered mesh layer, or a metal fiber mesh layer. The first capillary structure layer 4 can be a porous metal fiber mesh layer or a porous metal mesh layer. The metal in the above-mentioned materials can be, for example, copper, or other metal materials. Metal fiber mesh refers to a mesh formed by weaving multiple strands of metal wires after twisting into strands, and metal mesh refers to a mesh formed by weaving metal wires. The capillary structure layer obtained after these materials are processed has a plurality of irregular holes, which can be used to store working fluids and also enable the working fluids to flow. The processing technology of the above-mentioned material layers is prior art, and the specific processing technology is not elaborated in this application.

[0050] To meet the heat dissipation requirements in different scenarios, the sizes and shapes of the first capillary structure layer 4, the second capillary structure layer 5 and the third capillary structure layer 6 may be different. Taking the case where the cross-sections of the evaporation section shell 1 and the condensation section shell 3 are both rectangular as an example, the first capillary structure layer 4, the second capillary structure layer 5 and the third capillary structure layer 6 may be arranged in the following ways.

[0051] Figure 6 This is a cross-sectional view of the evaporation section shell, the first capillary structure layer and the second capillary structure layer in one embodiment of the present application. Figure 7 This is a cross-sectional view of the condensation section shell, the first capillary structure layer and the third capillary structure layer in one embodiment of the present application. Figure 6 and Figure 7 In a specific embodiment, the second capillary structure layer 5 covers part of the inner wall of the evaporation section housing 1, and the covered inner wall may be the inner wall of the evaporation section housing 1 corresponding to the first planar portion 11. The third capillary structure layer 6 covers part of the inner wall of the condensation section housing 3, and the covered inner wall may be the inner wall of the condensation section housing 3 corresponding to the second planar portion 31. The first planar portion 11 and the second planar portion 31 are located on the same side of the housing, for example, both are located at the bottom of the housing. Along the radial direction of the housing, the first capillary structure layer 4 completely covers the second capillary structure layer 5 and the third capillary structure layer 6.

[0052] Figure 8 This is a cross-sectional view of the evaporation section shell, the first capillary structure layer and the second capillary structure layer in another embodiment of the present application. Fig. 9 This is a cross-sectional view of the condensation section shell, the first capillary structure layer and the third capillary structure layer in another embodiment of the present application. Figure 8 and Fig. 9 In another specific embodiment, the second capillary structure layer 5 covers part of the inner wall of the evaporation section shell 1, and the covered inner wall may be the inner wall of the evaporation section shell 1 corresponding to the first plane portion 11. The third capillary structure layer 6 completely covers the inner wall of the condensation section shell 3 along the circumference of the condensation section shell 3. That is, the cross section of the third capillary structure layer 6 is a rectangular frame. Along the radial direction of the shell, the first capillary structure layer 4 completely covers the second capillary structure layer 5. And the first capillary structure layer 4 overlaps part of the third capillary structure layer 6, that is, the first capillary structure layer 4 is only connected to the area where the third capillary structure layer 6 is located at the bottom of the shell.

[0053] Fig.10 This is a cross-sectional view of the evaporation section shell, the first capillary structure layer and the second capillary structure layer in another embodiment of the present application. Fig.11 This is a cross-sectional view of the condensation section housing 3, the first capillary structure layer and the third capillary structure layer in another embodiment of the present application. Fig.10 and Fig.11 In another specific embodiment, the second capillary structure layer 5 completely covers the inner wall of the evaporation section shell 1 along the circumference of the evaporation section shell 1, and the cross section of the second capillary structure layer 5 is a rectangular frame. The third capillary structure layer 6 covers part of the inner wall of the condensation section shell 3, and the covered position may be the inner wall of the condensation section shell 3 corresponding to the second plane portion 31. Along the radial direction of the shell, the first capillary structure layer 4 completely covers the third capillary structure layer 6. And the first capillary structure layer 4 overlaps part of the second capillary structure layer 5, that is, the first capillary structure layer 4 is only connected to the area of ​​the second capillary structure layer 5 located at the bottom of the shell.

[0054] Fig.12 This is a cross-sectional view of the evaporation section shell, the first capillary structure layer and the second capillary structure layer in another embodiment of the present application. Fig.13 This is a cross-sectional view of the condensation section shell, the first capillary structure layer and the third capillary structure layer in another embodiment of the present application. Fig.12 and Fig.13 In another specific embodiment, the second capillary structure layer 5 completely covers the inner wall of the evaporation section shell 1 along the circumference of the evaporation section shell 1. The third capillary structure layer 6 completely covers the inner wall of the condensation section shell 3 along the circumference of the condensation section shell 3. The first capillary structure layer 4 completely covers the second capillary structure layer 5 and the first capillary structure layer 4 along the circumference of the shell. In other words, the cross-sections of the first capillary structure layer 4, the second capillary structure layer 5 and the third capillary structure layer 6 are all rectangular frames. This arrangement makes the contact area between the first capillary structure layer 4 and the second capillary structure layer 5 and the third capillary structure layer 6 larger, and the flow resistance of the working medium is smaller, which is conducive to improving the heat dissipation efficiency.

[0055] In some of the above embodiments, along the axial direction of the shell, the first capillary structure layer 4 is the same length as the shell, the second capillary structure layer 5 is the same length as the evaporation section shell 1 , and the third capillary structure layer 6 is the same length as the condensation section shell 3 .

[0056] The shapes and sizes of the first capillary structure layer 4, the second capillary structure layer 5 and the third capillary structure layer 6 are not limited to those in the above specific embodiments, but may also be other shapes and sizes. The cross section of the housing is not limited to the rectangle in the above embodiments, but may also be other shapes, which are not specifically limited in this application.

[0057] Fig.14 FIG. 1 is a schematic diagram of the structure of a heat dissipation device in one embodiment of the present application. Fig.14As shown, an embodiment of the present application further provides a heat dissipation device, which includes a radiator 101, a cold source 102 and a flexible heat pipe in any of the above embodiments. The cold source 102 is in contact with and connected to the condensing section shell 3, and is used to cool the condensing section shell 3. The radiator 101 is connected to the evaporation section shell 1. Specifically, the radiator 101 can be a steam chamber radiator (VC), and the radiator 101 is used to dissipate heat for the heating device 200, and the heating device 200 can be a chip. The evaporation section shell 1 is in contact with and connected to the radiator 101, and specifically can be welded to reduce the thermal resistance between the evaporation section shell 1 and the radiator 101. The flexible heat pipe is used to extend part of the heat of the heating device 200 absorbed by the radiator 101 to the external area of ​​the radiator 101, and assist the radiator 101 in dissipating heat. The heat dissipation device of the present application has a high heat dissipation efficiency. The flexible heat-insulating section shell 2 enables the flexible heat pipe to overcome the problem of eccentricity of the heat dissipation structure caused by the heavy weight of the area far away from the heat source device of the rigid heat pipe, and the wavy or zigzag first capillary structure layer 4 inside the heat-insulating section shell 2 has good bending resistance and is not easy to break. The flexible heat pipe is not easily damaged after multiple bending, thereby improving the reliability of the heat dissipation device.

[0058] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A flexible heat pipe, characterized in that: include: A shell having an inner cavity, the shell comprising an evaporation section shell, an insulation section shell and a condensation section shell connected in sequence, and the insulation section shell is flexible; A first capillary structure layer is disposed in the inner cavity, the first capillary structure layer is flexible, and has a plurality of bending parts connected end to end, and the bending parts are located in the insulation section shell; A second capillary structure layer is disposed on the inner wall of the evaporation section shell, and the second capillary structure layer covers at least a portion of the inner wall of the evaporation section shell; A third capillary structure layer is disposed on the inner wall of the condensing section shell, and the third capillary structure layer covers at least a portion of the inner wall of the condensing section shell; Two ends of the first capillary structure layer are respectively connected to the second capillary structure layer and the third capillary structure layer.

2. The flexible heat pipe according to claim 1, characterized in that: The first capillary structure layer and at least a portion of the second capillary structure layer are stacked along the radial direction of the shell; the first capillary structure layer and at least a portion of the third capillary structure layer are stacked along the radial direction of the shell.

3. The flexible heat pipe according to claim 2, characterized in that: It also includes a first pressing member, which is disposed in the evaporation section shell and is used to press the first capillary structure layer onto the second capillary structure layer.

4. The flexible heat pipe according to claim 2, characterized in that: It also includes a second pressing member, which is arranged in the condensation section shell and is used to press the first capillary structure layer onto the third capillary structure layer.

5. The flexible heat pipe according to claim 1, characterized in that: The insulation section shell is a bellows.

6. The flexible heat pipe according to claim 1, characterized in that: The outer surface of the evaporator section shell includes a first planar portion.

7. The flexible heat pipe according to claim 1, characterized in that: The outer surface of the condensing section shell includes a second planar portion.

8. The flexible heat pipe according to claim 1, characterized in that: The first capillary structure layer is a metal fiber mesh layer or a metal mesh layer; The second capillary structure layer is a sintered metal powder layer, a metal sintered mesh layer or a metal fiber mesh layer; The third capillary structure layer is a sintered metal powder layer, a metal sintered mesh layer, or a metal fiber mesh layer.

9. The flexible heat pipe according to claim 1, characterized in that: The outer wall of the condensation section shell is provided with at least one fin.

10. A heat dissipation device, characterized in that: The invention comprises a radiator, a cold source and the flexible heat pipe as claimed in any one of claims 1 to 9, wherein the radiator is connected to the evaporation section shell, and the cold source is connected to the condensation section shell.

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