Liquid absorption core, heat pipe and manufacturing method of heat pipe

Abstract

The invention provides a liquid absorption core, a heat pipe and a manufacturing method thereof, the liquid absorption core comprises a first silk screen ring and at least two second silk screen rings, the silk screen mesh number of the first silk screen ring is larger than that of the second silk screen rings, at least two supporting rods are arranged between the adjacent second silk screen rings, and the supporting rods extend in the axial direction of the second silk screen rings. The first silk screen ring and the at least two second silk screen rings are integrally woven and formed, and the supporting rods between the at least two silk screen rings and the second silk screen rings are integrally woven and formed; the first silk screen ring is elastically installed in the outer pipe by applying tension in the axial direction of the first silk screen ring, and the peripheral wall of the first silk screen ring elastically abuts against the inner wall of the outer pipe. According to the wick, the installation process is simplified, the installation stability between the wick and the outer pipe is improved, and the problem of poor heat conduction caused by poor installation tightness of a traditional pipe shell and the wick is completely avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange, and in particular to a liquid wick, a heat pipe and a manufacturing method thereof. Background Art

[0002] Heat pipes are a type of high-efficiency heat transfer element that can withstand high-temperature environments and transfer heat. They are widely used in aerospace, petrochemical, energy and power and other fields.

[0003] Among them, the liquid wick is one of the key components of the heat pipe. The porous structure of the liquid wick has a capillary effect, which can provide driving force for the flow of liquid working medium in the pipe and promote heat transfer in the pipe to ensure the normal operation of the heat pipe.

[0004] Traditional wick structures include grooved, wire mesh, sintered, loop, and trunk types. The loop wick is composed entirely of multiple layers of wire mesh. A ring cavity of a certain thickness is left between the wire mesh wick and the inner wall of the outer tube to facilitate the reflux of liquid working fluid, ensuring sufficient working fluid for phase change in the evaporation section of the heat pipe. While loop wicks offer a simple structure, low manufacturing cost, and widespread application, they are difficult to control, resulting in excessive thermal resistance. Furthermore, the presence of a loop gap can cause the wick to collapse and deform due to insufficient force, ultimately deteriorating heat pipe performance.

[0005] For details, please refer to the patent application number 202222295056.7, entitled "A Horizontally Running High-Temperature Heat Pipe with a Large Aspect Ratio", which discloses that when the wick is a wire mesh rolled wick, a wire mesh support is provided on its outside to increase the rigidity of the wick itself and reduce the difficulty of installing the wick.

[0006] However, under this method, the wick is usually pressed into the tube shell, and this process undoubtedly has the risk of damaging the wick structure. When the size of the wick and the support is reduced so that the wick fits in a small gap with the inner wall of the tube shell, installation is facilitated, but poor contact between the tube shell and the wick is likely to occur, affecting heat conduction.

[0007] Based on this, the inventors of the present application propose a liquid wick, a heat pipe and a manufacturing method thereof, in order to solve one or more of the above-mentioned technical problems. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to overcome the defect of inconvenient installation between the liquid wick and the tube shell in the prior art, and to provide a liquid wick, a heat pipe and a manufacturing method thereof.

[0009] The present invention solves the above technical problems through the following technical solutions:

[0010] The present invention provides a liquid-absorbing core, which is characterized in that it includes:

[0011] A first wire mesh ring and at least two second wire mesh rings, the mesh number of the first wire mesh ring is greater than the mesh number of the second wire mesh ring, at least two support rods are provided between adjacent second wire mesh rings, the support rods are arranged to extend axially along the second wire mesh ring, the first wire mesh ring and at least two second wire mesh rings are integrally woven together, and the support rods between at least two of the wire mesh rings are integrally woven together with the second wire mesh rings; wherein,

[0012] The first wire mesh ring is elastically installed in the outer tube by applying a pulling force along the axial direction of the first wire mesh ring, so that the outer peripheral wall of the first wire mesh ring is elastically abutted against the inner wall of the outer tube.

[0013] According to one embodiment of the present invention, the support rod is a hollow rod with a woven porous structure.

[0014] According to one embodiment of the present invention, one end of the first wire mesh ring is elastically in contact with the inner wall of the outer tube, and the other end is in close contact with the adjacent second wire mesh ring.

[0015] According to one embodiment of the present invention, at least two of the support rods between adjacent second wire mesh circles are evenly distributed around the circumference of the second wire mesh circle, and the axial length of the support plate is consistent with the axial length of the second wire mesh circle.

[0016] According to one embodiment of the present invention, the first wire mesh ring, the second wire mesh ring and the support rod are all woven from elastic nickel-based shape memory alloy or stainless steel high-temperature-resistant and corrosion-resistant metal wires.

[0017] According to one embodiment of the present invention, the support rods are woven together with adjacent second wire mesh circles.

[0018] According to one embodiment of the present invention, the number of the second wire mesh rings is at least three, and an annular cavity is formed between every two adjacent second wire mesh rings;

[0019] Along the axial projection direction of the first wire mesh ring, all the support rods are evenly distributed around the circumference of the first wire mesh ring.

[0020] According to one embodiment of the present invention, the interlayer spacing between adjacent second wire mesh rings is consistent, and the interlayer spacing is consistent with the outer diameter of the support rod.

[0021] The present invention also provides a heat pipe, comprising:

[0022] External control;

[0023] The absorbent core as described above is elastically installed in the outer tube.

[0024] The present invention also provides a method for manufacturing a heat pipe, using the heat pipe as described above, the manufacturing method comprising:

[0025] Applying a preset pulling force along the axial direction of the absorbent core to stretch the absorbent core to reduce the outer diameter of the absorbent core;

[0026] Inserting the elongated absorbent core into the outer tube;

[0027] After the wick to be expanded and recovered comes into contact with the inner wall of the outer tube, end caps are installed on both sides of the outer tube.

[0028] The positive progress effect of the present invention is:

[0029] The absorbent core of the present invention has excellent elasticity and rigidity because the mesh count of the first wire mesh ring is greater than that of the second wire mesh ring. Moreover, the second wire mesh ring is integrally woven with the first wire mesh ring, so that the overall structure of the absorbent core can maintain high rigidity. During installation, it is only necessary to provide a tensile force in the axial direction of the absorbent core so that the absorbent core is stretched along its axial direction and its radial dimension becomes smaller, so that the absorbent core can be easily installed in the outer tube. After installation, the absorbent core self-expands and fits the inner wall of the outer tube, which simplifies the installation process and improves the installation stability between the absorbent core and the outer tube, completely avoiding the problem of poor heat conduction caused by the poor installation tightness between the traditional tube shell and the absorbent core. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0031] Figure 1 Schematic cross-sectional view of the absorbent core of the present invention;

[0032] Figure 2 An axonometric view of the absorbent core of the present invention at one angle;

[0033] Figure 3 This is a schematic structural diagram of an embodiment of a support rod of the present invention;

[0034] Figure 4 A schematic structural diagram of another embodiment of the support rod of the present invention;

[0035] Figure 5 Schematic diagram of the installation process between the absorbent core and the outer tube of the present invention.

[0036] 1. The first wire mesh circle;

[0037] 2. Second wire mesh ring; 21. Ring cavity;

[0038] 3. Support rod;

[0039] 4. External control. DETAILED DESCRIPTION

[0040] The present invention is further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description herein. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0042] Please refer to Figures 1 to 5 The present invention proposes a liquid-absorbing core, which includes a first wire mesh ring 1 and at least two second wire mesh rings 2. The mesh number of the first wire mesh ring 1 is greater than the mesh number of the second wire mesh ring 2. At least two support rods 3 are provided between adjacent second wire mesh rings 2. The support rods 3 are arranged axially extending along the second wire mesh ring 2. The first wire mesh ring 1 and the at least two second wire mesh rings 2 are integrally woven together, and the support rods 3 between the at least two wire mesh rings are integrally woven together with the second wire mesh rings 2; wherein, the first wire mesh ring 1 is elastically installed in the outer tube 4 by applying tension along the axial direction of the first wire mesh ring 1, and the outer peripheral wall of the first wire mesh ring 1 is elastically abutted against the inner wall of the outer tube 4.

[0043] As can be seen, the first mesh ring 1 is woven from metal wires of relatively thick and uniform diameter, and its outer diameter matches the inner diameter of the outer tube 4. Stretching the first mesh ring 1 can reduce its inner diameter, thereby facilitating the installation of the wick into the outer tube 4. When the tension is removed, the first mesh ring 1 returns to its original shape due to its own elastic force, allowing its outer wall to fit tightly against the inner wall of the outer tube 4.

[0044] At least two second mesh rings 2 are arranged inside the first mesh ring 1. The first mesh ring 1 and the second mesh ring 2 are woven into an integral body, thereby enhancing the overall rigidity of the absorbent core. When tension is applied axially along the first mesh ring 1, the second mesh ring 2, because it is woven into an integral body with the first mesh ring 1, is also pulled axially by the first mesh ring 1 to deform.

[0045] Adjacent second wire mesh rings 2 are connected and supported by at least two support rods 3, thereby avoiding the problem of collapse and deformation of the second wire mesh rings 2 with high mesh counts, and facilitating the normal circulation flow of the working medium in the pipe.

[0046] It can be seen that the installation method of the absorbent core of the present application is to axially stretch it to reduce its outer diameter and then install it into the outer tube 4. As a result, the first wire mesh ring 1 not only enhances the overall structural strength of the absorbent core, but also forms an effective abutment with the inner wall of the outer tube 4, thereby improving the thermal conductivity of the absorbent core.

[0047] Moreover, the size of the annular cavity 21 between adjacent second wire mesh rings 2 can be adjusted according to actual requirements for the size of the reflux chamber.

[0048] Please continue to refer to Figure 1 and Figure 2 The first wire mesh loop 1 can be a 20-mesh woven wire mesh loop, and the second wire mesh loop 2 can be a 400-mesh woven wire mesh loop. This allows the second wire mesh loop 2 to have a higher mesh count, smaller mesh spacing, and higher filtration accuracy. The first wire mesh loop 1, on the other hand, has a relatively lower mesh count, wider mesh spacing, and a thicker wire diameter, resulting in higher overall strength and better durability. This allows the first wire mesh loop 1 to enhance the overall structural strength of the wick, while the second wire mesh loop 2 can also maintain its excellent medium flowability.

[0049] It can be seen that the mesh counts of the first wire mesh ring 1 and the second wire mesh ring 2 are only examples and are not limiting.

[0050] The first wire mesh ring 1, the second wire mesh ring 2 and the support rod 3 are woven. Compared with the traditional rolled wire mesh, the woven wire mesh ring is conducive to making the pores more uniform, can provide a more stable capillary action, and ensure efficient liquid reflux. In addition, the woven wire mesh ring also has good mechanical strength and durability, and higher heat conduction efficiency.

[0051] It should be noted that the weaving process of the present application can be achieved through a weaving machine, and the weaving requirements can be adjusted according to needs. The specific details belong to the more conventional technical means in the field of weaving machines and are not limited here.

[0052] Reference Figure 3 and Figure 4 The support rod 3 can be a braided solid rod or a hollow rod.

[0053] Preferably, the support rod 3 is a hollow rod with a woven porous structure, which can play a supporting role on the one hand to form a chamber required for the reflux of the liquid working medium, and on the other hand is conducive to improving the overall fluidity of the liquid wick.

[0054] Optionally, two, four, or six support rods 3 may be provided between each two adjacent second wire mesh rings 2, with no specific limitation. Multiple support plates may be evenly distributed around the circumference of the second wire mesh rings 2, thereby preventing the high-mesh second wire mesh rings 2 from collapsing and deforming, thereby maintaining normal circulation of the working medium within the pipe.

[0055] Furthermore, the interlayer spacing between adjacent second wire mesh rings 2 corresponds to the size of the support rod 3 and is much smaller than the inner diameter of the second wire mesh ring 2, so that the support rod 3 has little effect on the backflow of the liquid working medium in the operating state.

[0056] In one embodiment, the support rods 3 are woven together with the adjacent second wire mesh circles 2, so that the support rods 3 not only support the annular cavity 21 between the adjacent second wire mesh circles 2, but also connect the adjacent second wire mesh circles 2 to improve the overall structural strength of the absorbent core.

[0057] It can be seen that different numbers of second wire mesh rings 2 can be set according to the size of the reflux annular cavity 21. In order to improve the overall structural strength of all second wire mesh rings 2, all support rods 3 are evenly distributed around the circumference of the first wire mesh ring 1 along the axial projection direction of the first wire mesh ring 1.

[0058] Please refer to Figure 5 , the weaving and installation process of the absorbent core is described as follows:

[0059] A first wire mesh ring 1 with low mesh count is woven by using metal wires that are elastic, heat-resistant and corrosion-resistant, and a second wire mesh ring 2 with multiple layers and high mesh count is woven by using metal wires with smaller wire diameters.

[0060] During the weaving process, the first wire mesh circle 1 with a low mesh count is woven together with the second wire mesh circle 2 with a high mesh count and the support rod 3, and the outer diameter of the first wire mesh circle 1 is kept slightly smaller than the inner diameter of the outer tube 4, and the diameter of the support rod 3 is consistent with the interlayer spacing of the adjacent second wire mesh circle 2.

[0061] After the overall structure is woven, axial tension is applied to stretch the wick to a diameter smaller than the inner diameter of the outer tube 4, and the wick is inserted into the outer tube 4. Due to the elasticity of the first and second wire mesh rings 1 and 2, they expand and return to their original shapes after the external force is removed, thereby achieving a tight fit between the outer wall of the first wire mesh ring 1 and the inner wall of the outer tube 4, thus completing the installation of the wick.

[0062] The following describes the process of weaving and installing the absorbent core in one embodiment:

[0063] First, prepare a nickel-based shape memory alloy or stainless steel wire material with elasticity, which is resistant to high temperature and corrosion. Use a wire with a diameter of 0.3 mm to weave a layer of 20-mesh braided wire mesh ring, corresponding to the first wire mesh ring 1, and at the same time make the outer diameter of the first wire mesh ring 1 correspond to the inner diameter of the outer tube 4.

[0064] Then, three layers of 400-mesh braided wire mesh are woven using 0.025mm diameter wire, corresponding to the three second wire mesh coils 2. During the weaving process, they are integrated with a layer of 20-mesh braided wire mesh (first wire mesh coil 1) and a braided hollow rod or solid reinforcing rod (support rod 3). The spacing between adjacent layers of the three second wire mesh coils 2 is 0.17mm, meaning the diameter of the support rod 3 is 0.017mm.

[0065] After the absorbent core is woven, it is stretched and lengthened by applying tension in the axial direction, and the diameter of the structure is reduced so that it can be smoothly delivered into the outer tube 4; after the absorbent core enters the outer tube 4, due to the elasticity of the material itself, it recovers its original shape through self-expansion and fits tightly with the inner wall of the outer tube 4.

[0066] The present invention further provides a heat pipe comprising an outer tube 4 and the above-mentioned liquid wick, wherein the liquid wick is elastically installed in the outer tube 4 .

[0067] The present invention also provides a heat pipe manufacturing method, comprising:

[0068] Applying a preset pulling force along the axial direction of the absorbent core to stretch the absorbent core to reduce the outer diameter of the absorbent core;

[0069] Insert the elongated wick into the outer tube;

[0070] After the expanded and recovered liquid-absorbing core comes into contact with the inner wall of the outer tube, end caps are installed on both sides of the outer tube.

[0071] As described above, the wick, heat pipe and manufacturing method thereof proposed in the present invention have at least the following beneficial effects:

[0072] First, the first wire mesh loop has a low mesh count, resulting in excellent elasticity and rigidity, which helps maintain a certain rigidity for the entire wick. At least two second wire mesh loops are positioned within the first wire mesh loop, connected by support rods. This solves the problem of high-mesh second wire mesh loops being prone to collapse and deformation, and helps maintain the normal circulation of the working fluid within the tube.

[0073] Second, the absorbent core is made of a braided method and is woven with elastic nickel-based shape memory alloy or stainless steel high-temperature resistant and corrosion-resistant metal wire. Therefore, it only needs to apply a certain external force along the axial direction to reduce its outer diameter, which is convenient for installation into the outer tube. After the external force is removed, the absorbent core returns to its original state due to its own elastic force, achieving a close fit with the inner wall of the outer tube, solving the problem of inconvenient installation of traditional absorbent cores.

[0074] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "install", "connect", "connect", "fix" and so on should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can also be a mechanical connection. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0075] This application uses specific terms to describe the embodiments of this application. For example, "one embodiment," "an embodiment," and / or "some embodiments" refer to a certain feature, structure, or characteristic associated with at least one embodiment of this application. Therefore, it should be emphasized and noted that "one embodiment," "an embodiment," or "an alternative embodiment" mentioned twice or multiple times in different locations in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application may be appropriately combined.

[0076] Although the present invention is disclosed above with reference to preferred embodiments, this is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modifications, equivalent variations, and modifications made to the above embodiments in accordance with the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection defined by the claims of the present invention.

Claims

1. A liquid-absorbing core, characterized in that: include: A first wire mesh ring and at least two second wire mesh rings, the mesh number of the first wire mesh ring is greater than the mesh number of the second wire mesh ring, at least two support rods are provided between adjacent second wire mesh rings, the support rods are arranged to extend axially along the second wire mesh ring, the first wire mesh ring and at least two second wire mesh rings are integrally woven together, and the support rods between at least two of the wire mesh rings are integrally woven together with the second wire mesh rings; wherein, The first wire mesh ring is elastically installed in the outer tube by applying a pulling force along the axial direction of the first wire mesh ring, so that the outer peripheral wall of the first wire mesh ring is elastically abutted against the inner wall of the outer tube.

2. The absorbent core according to claim 1, wherein The support rod is a hollow rod with a woven porous structure.

3. The absorbent core according to claim 1, wherein One end of the first wire mesh ring is in elastic contact with the inner wall of the outer tube, and the other end is in close contact with the adjacent second wire mesh ring.

4. The absorbent core according to claim 1, wherein At least two of the support rods between adjacent second wire mesh circles are evenly distributed around the circumference of the second wire mesh circle, and the axial length of the support plate is consistent with the axial length of the second wire mesh circle.

5. The absorbent core according to claim 1, wherein The first wire mesh ring, the second wire mesh ring and the support rod are all woven from elastic nickel-based shape memory alloy or stainless steel high-temperature-resistant and corrosion-resistant metal wires.

6. The absorbent core according to claim 1, wherein The support rods are woven together with adjacent second wire mesh circles respectively.

7. The absorbent core according to claim 1, wherein The number of the second wire mesh rings is at least three, and an annular cavity is formed between every two adjacent second wire mesh rings; Along the axial projection direction of the first wire mesh ring, all the support rods are evenly distributed around the circumference of the first wire mesh ring.

8. The absorbent core according to claim 1, wherein The interlayer spacing between adjacent second wire mesh circles is consistent, and the interlayer spacing is consistent with the outer diameter of the support rod.

9. A heat pipe, characterized in that: include: External control; The absorbent core according to any one of claims 1 to 8, wherein the absorbent core is elastically mounted in the outer tube.

10. A method for manufacturing a heat pipe, characterized in that: Using the heat pipe according to claim 9, the manufacturing method includes: Applying a preset pulling force along the axial direction of the absorbent core to stretch the absorbent core to reduce the outer diameter of the absorbent core; Inserting the elongated absorbent core into the outer tube; After the wick to be expanded and recovered comes into contact with the inner wall of the outer tube, end caps are installed on both sides of the outer tube.

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