Thin woven heat pipe with anti-corrosion function

Abstract

The utility model discloses a thin braided heat pipe with an anti-corrosion function, which comprises an outer layer, a middle layer, an inner layer and a pipe shell, the pipe shell is arranged in the center of the thin braided heat pipe with the anti-corrosion function, the inner layer is arranged on the inner surface of the pipe shell, the middle layer is sleeved on the outer surface of the pipe shell, and the outer layer is arranged on the inner surface of the pipe shell. The outer layer is arranged on the outer side of the middle layer in a sleeving mode, so that a multi-layer pipe structure which is sequentially sleeved and stacked is formed. The pipe shell is arranged to be a closed flexible pipeline cavity. The inner layer is a capillary core layer; the middle layer is a composite heat conduction layer; and the outer layer is a woven protective layer. According to the thin braided heat pipe with the anti-corrosion function, based on the braided structure of the outer layer, the anti-corrosion, wear-resistant and impact-resistant performance of the heat pipe can be enhanced, and the application situation that the light weight of the heat pipe is insufficient can be effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of heat pipe technology, and in particular to a thin braided heat pipe with anti-corrosion function. Background Technology

[0002] A heat pipe is a highly efficient passive heat transfer device based on the principle of phase change heat transfer, capable of rapidly transferring large amounts of heat with minimal temperature difference. Its core feature is utilizing the evaporation and condensation cycle of the working fluid to achieve equivalent thermal conductivity far exceeding that of metallic materials (such as copper and aluminum), without requiring external energy input. Existing heat pipe products typically consist of a shell and a capillary wick. The working fluid flows inside the shell, which is supported by a sealed metal or composite material outer shell to ensure internal vacuum. The capillary wick is a porous medium layer such as a metal mesh, sintered powder, or a grooved structure, driving the liquid working fluid to reflux via capillary force. The working fluid can be a suitable liquid refrigerant, such as water, ammonia, acetone, or liquid metal, depending on the temperature, to transfer heat through phase change. More specifically, a heat pipe includes an evaporation section and a condensation section. In the evaporation section, the working fluid absorbs latent heat from the outside and evaporates into vapor. The vapor flows at high speed to the condensation section under the pressure difference. In the condensation section, the vapor releases latent heat and condenses into liquid. Then, the heat is dissipated through the tube shell. During this process, the capillary wick draws the liquid working fluid back to the evaporation section through capillary force, thus completing the working fluid cycle.

[0003] However, existing heat pipes lack flexibility and adjustability, and their protective properties such as corrosion resistance, wear resistance, and impact resistance are insufficient, thus limiting the widespread application of existing heat pipe products. Utility Model Content

[0004] Therefore, it is necessary to provide a thin braided heat pipe with corrosion resistance to address the technical problems of insufficient flexibility and protection performance of existing heat pipes.

[0005] A thin braided heat pipe with corrosion resistance is provided. The thin braided heat pipe with corrosion resistance includes an outer layer, a middle layer, an inner layer, and a shell. The shell is located at the center of the thin braided heat pipe with corrosion resistance. The inner layer is located on the inner surface of the shell. The middle layer is placed on the outer surface of the shell. The outer layer is placed on the outside of the middle layer, thereby forming a multi-layered tube structure that is stacked sequentially.

[0006] The shell is designed as a closed, flexible pipe cavity to hold the working fluid; the inner layer is a capillary core layer to drive the working fluid inside the shell back from the condensation section to the evaporation section, reducing flow resistance and preventing direct flow of the working fluid; the middle layer is a composite heat-conducting layer to quickly transfer heat from the evaporation section to the condensation section, while also supporting the shape of the shell and preventing it from collapsing; the outer layer is a braided protective layer to resist external mechanical impacts and enhance the wear resistance and corrosion resistance of the heat pipe.

[0007] In one embodiment, the wall thickness of the tube shell is set to 0.15-0.25 mm.

[0008] In one embodiment, the wall thickness of the tube shell is set to 0.2 mm.

[0009] In one embodiment, the aforementioned shell comprises two polyimide film layers and a copper film layer, with the two polyimide film layers respectively covering the inner and outer surfaces of the copper film layer, thereby forming a nested structure.

[0010] In one embodiment, the wall thickness of the copper film layer is set to 4-8 μm.

[0011] In one embodiment, the wall thickness of the copper film layer is set to 5 μm.

[0012] In one embodiment, the wall thickness of each of the above-mentioned polyimide film layers is set to 40-60 μm.

[0013] In one embodiment, the wall thickness of the polyimide film layer is 50 μm.

[0014] In one embodiment, the aforementioned copper film layer is sealed by laser welding.

[0015] In one embodiment, the inner layer includes a laser-sintered copper powder layer and a copper braided layer. The copper braided layer is disposed on the inner surface of the tube shell, and the laser-sintered copper powder layer is disposed on the inner surface of the copper braided layer, thereby forming a nested structure.

[0016] In one embodiment, the laser-sintered copper powder layer described above is configured as a porous structure;

[0017] In one embodiment, the copper braided layer is uniformly arranged with microgrooves.

[0018] In one embodiment, the thickness of the laser-sintered copper powder layer is set to 0.3 mm, and the porosity is set to 40%.

[0019] In one embodiment, the groove width of the copper braided layer is set to 100 μm and the depth is set to 200 μm.

[0020] In one embodiment, the aforementioned intermediate layer is configured as a copper-plated carbon fiber woven mesh.

[0021] In one embodiment, the diameter of the copper-plated carbon fiber monofilament in the intermediate layer is set to 7 μm, the braiding angle is set to 30°, and the porosity is set to 50%.

[0022] In one embodiment, the outer layer is configured as a three-dimensional braided tube of stainless steel wire.

[0023] In one embodiment, the outer stainless steel wire has a diameter of 0.1 mm, a braiding angle of 45°, and a double-layer braiding density of more than 90%.

[0024] The aforementioned thin braided heat pipe with corrosion resistance is based on a flexible shell that allows for elastic deformation of the heat pipe, thereby improving the flexibility of its installation to suit more application scenarios. At the same time, combined with an inner layer with a capillary wick structure and an intermediate layer that enhances thermal conductivity, it can effectively ensure the axial and radial thermal conductivity of the heat pipe, promoting the circulation of the working fluid between the condensation and evaporation sections while enhancing heat transfer efficiency. Furthermore, the outer braided structure not only strengthens the heat pipe's corrosion resistance, wear resistance, and impact resistance, but also effectively improves the current situation where lightweight heat pipes are insufficient. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a thin braided heat pipe with corrosion resistance in one embodiment. Detailed Implementation

[0026] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0027] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0032] Please see Figure 1This utility model discloses a thin braided heat pipe 1 with anti-corrosion function. The thin braided heat pipe 1 with anti-corrosion function includes an outer layer 10, a middle layer 20, an inner layer 30 and a shell 40. The shell 40 is disposed at the center of the thin braided heat pipe 1 with anti-corrosion function, the inner layer 30 is disposed on the inner surface of the shell 40, the middle layer 20 is sleeved on the outer surface of the shell 40, and the outer layer 10 is sleeved on the outer side of the middle layer 20, thereby forming a multi-layer tube structure that is stacked sequentially. The heat pipe shell 40 is configured as a closed flexible pipe cavity to contain the working fluid; the inner layer 30 is configured as a capillary core layer to drive the working fluid inside the heat pipe shell 40 to flow back from the condensation section to the evaporation section, reducing flow resistance and preventing direct flow of the working fluid; the middle layer 20 is configured as a composite heat-conducting layer to quickly conduct heat from the evaporation section to the condensation section, while also supporting the shape of the heat pipe shell 40 and preventing it from collapsing; the outer layer 10 is configured as a braided protective layer to resist external mechanical impacts and enhance the wear resistance and corrosion resistance of the heat pipe. Based on the above configuration, compared with existing heat pipe products, the thin braided heat pipe with corrosion resistance of this utility model can achieve elastic deformation of the heat pipe based on the flexible shell 40, thereby improving the flexibility of the heat pipe to be applicable to more application scenarios. At the same time, combined with the inner layer 30 with capillary wick structure and the intermediate layer 20 which is enhanced for thermal conductivity, the axial thermal conductivity and radial thermal conductivity of the heat pipe can be effectively guaranteed, which can enhance the heat transfer efficiency while promoting the circulation of the working fluid between the condensation section and the evaporation section. In addition, the braided structure of the outer layer 10 can not only enhance the corrosion resistance, wear resistance and impact resistance of the heat pipe, but also effectively improve the current situation of insufficient lightweight application of heat pipes.

[0033] Furthermore, the wall thickness of the casing 40 is set to 0.15-0.25 mm. Preferably, the wall thickness of the casing 40 is set to 0.2 mm.

[0034] Furthermore, the casing 40 includes two polyimide film layers 41 and a copper film layer 42. The two polyimide film layers 41 respectively cover the inner and outer surfaces of the copper film layer 42, thereby forming a nested structure. Specifically, in one embodiment, the wall thickness of the copper film layer 42 is set to 4-8 μm, preferably 5 μm; the wall thickness of each polyimide film layer 41 is set to 40-60 μm, preferably 50 μm. Based on the above configuration, the copper film layer 42 combined with the polyimide film layer 41 provides a flexible base for the casing 40, allowing the heat pipe to be bent to a certain extent.

[0035] Furthermore, in one embodiment, the copper film layer 42 is sealed by laser welding.

[0036] Furthermore, the inner layer 30 includes a laser-sintered copper powder layer 31 and a copper braided layer 32. The copper braided layer 32 is disposed on the inner surface of the tube shell 40, and the laser-sintered copper powder layer 31 is disposed on the inner surface of the copper braided layer 32, thereby forming a nested structure. The laser-sintered copper powder layer 31 is configured with a porous structure to provide basic capillary pressure; the copper braided layer 32 has uniformly arranged microgrooves to form high-speed reflux channels. Specifically, in one embodiment, the thickness of the laser-sintered copper powder layer 31 is set to 0.3 mm, and the porosity is set to 40%; the groove width of the copper braided layer 32 is set to 100 μm, and the depth is set to 200 μm.

[0037] Furthermore, the intermediate layer 20 is configured as a copper-plated carbon fiber woven mesh, thereby ensuring that the intermediate layer 20 can quickly conduct heat from the evaporation section to the condensation section, while also supporting the shell 40. Specifically, in one embodiment, the diameter of the copper-plated carbon fiber monofilament in the intermediate layer 20 is set to 7μm, the weaving angle is set to 30°, and the porosity is set to 50%.

[0038] Furthermore, the outer layer 10 is configured as a three-dimensional braided tube of stainless steel wire to resist external mechanical impact, wear, and corrosion, and to provide bending resistance and protect the internal structure. Specifically, in one embodiment, the diameter of the stainless steel wire in the outer layer 10 is set to 0.1 mm, the braiding angle is set to 45°, and the double-layer braiding density is greater than 90%.

[0039] In summary, the corrosion-resistant thin braided heat pipe disclosed in this invention utilizes a flexible shell to achieve elastic deformation, thereby enhancing the flexibility of heat pipe installation to suit more application scenarios. Simultaneously, the combination of an inner layer with a capillary wick structure and an intermediate layer enhanced for thermal conductivity effectively ensures both axial and radial thermal conductivity of the heat pipe, promoting the circulation of the working fluid between the condensation and evaporation sections while enhancing heat transfer efficiency. Furthermore, the outer braided structure not only strengthens the heat pipe's corrosion resistance, wear resistance, and impact resistance but also effectively addresses the current shortcomings in the lightweight design of heat pipes.

[0040] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A thin braided heat pipe with corrosion resistance, characterized in that, include: The structure consists of an outer layer, a middle layer, an inner layer, and a shell. The shell is located at the center of a thin braided heat pipe with corrosion protection. The inner layer is located on the inner surface of the shell. The middle layer is fitted onto the outer surface of the shell. The outer layer is fitted onto the outer side of the middle layer, thus forming a multi-layered tube structure that is stacked sequentially. The shell is designed as a closed, flexible pipe cavity to hold the working fluid; the inner layer is a capillary core layer to drive the working fluid inside the shell back from the condensation section to the evaporation section, reducing flow resistance and preventing direct flow of the working fluid; the middle layer is a composite heat-conducting layer to quickly transfer heat from the evaporation section to the condensation section, while also supporting the shape of the shell and preventing it from collapsing; the outer layer is a braided protective layer to resist external mechanical impacts and enhance the wear resistance and corrosion resistance of the heat pipe.

2. The thin braided heat pipe with anti-corrosion function according to claim 1, characterized in that, The wall thickness of the tube shell is set to 0.15-0.25mm.

3. The thin braided heat pipe with anti-corrosion function according to claim 2, characterized in that, The tube shell includes two polyimide film layers and a copper film layer. The two polyimide film layers respectively cover the inner and outer surfaces of the copper film layer, thereby forming a nested structure.

4. The thin braided heat pipe with anti-corrosion function according to claim 3, characterized in that, The copper film thickness is set to 4-8 μm.

5. The thin braided heat pipe with anti-corrosion function according to claim 4, characterized in that, The wall thickness of each polyimide film layer is set to 40-60 μm.

6. The thin braided heat pipe with anti-corrosion function according to claim 5, characterized in that, The inner layer includes a laser-sintered copper powder layer and a copper braided layer. The copper braided layer is disposed on the inner surface of the tube shell, and the laser-sintered copper powder layer is disposed on the inner surface of the copper braided layer, thereby forming a nested structure.

7. The thin braided heat pipe with anti-corrosion function according to claim 6, characterized in that, The laser-sintered copper powder layer is configured with a porous structure.

8. The thin braided heat pipe with anti-corrosion function according to claim 7, characterized in that, The copper braided layer has microgrooves evenly distributed.

9. The thin braided heat pipe with anti-corrosion function according to claim 8, characterized in that, The middle layer is made of copper-plated carbon fiber woven mesh.

10. The thin braided heat pipe with anti-corrosion function according to claim 9, characterized in that, The outer layer is made of stainless steel wire three-dimensional braided tube.

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