Liquid absorbing core, heat pipe and method for manufacturing the same

Abstract

The application provides a liquid absorption core, a heat pipe and a manufacturing method thereof. The liquid absorption core comprises 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 that of the second wire mesh ring. At least two supporting rods are arranged between adjacent second wire mesh rings and extend along the axial direction of the second wire mesh ring. The first wire mesh ring and the at least two second wire mesh rings are integrally woven and formed. The supporting rods between the at least two second wire mesh rings and the second wire mesh rings are integrally woven and formed. The first wire mesh ring is elastically mounted into an outer pipe by applying a pulling force along the axial direction of the first wire mesh ring, and the outer peripheral wall of the first wire mesh ring elastically abuts against the inner wall of the outer pipe. The above-mentioned liquid absorption core simplifies the mounting process, improves the mounting stability between the liquid absorption core and the outer pipe, and completely avoids the problem of poor heat conduction caused by poor tightness between the traditional pipe shell and the liquid absorption core.

Description

Technical Field

[0001] This invention relates to the field of heat exchange technology, specifically to a liquid wick, a heat pipe, and a method for manufacturing the same. Background Technology

[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 industries.

[0003] The wick is one of the key components of a heat pipe. Its porous structure has a capillary effect, which can provide a driving force for the flow of liquid working fluid inside the pipe, thereby promoting heat transfer and ensuring the normal operation of the heat pipe.

[0004] Traditional wick structures include grooved, wire mesh, sintered, annular, and dry-channel types. Among these, the annular wick consists of multiple layers of wire mesh, with a certain thickness of annular channel between the wire mesh wick and the inner wall of the outer tube. This facilitates the reflux of the liquid working fluid, ensuring sufficient working fluid for phase change in the evaporation section of the heat pipe. Annular wicks are simple in structure, low in manufacturing cost, and widely used. However, the annular gap between the wick and the tube wall is difficult to control, easily leading to excessive thermal resistance. Furthermore, the presence of annular gaps can cause insufficient stress on the wick, leading to collapse and deformation, ultimately resulting in deterioration of the heat pipe performance.

[0005] For details, please refer to the patent with application number 202222295056.7 and title "A High Aspect Ratio Horizontally Operating High Temperature Heat Pipe", which discloses that when the liquid absorbent core is a wire mesh rolled liquid absorbent core, a wire mesh support is set on its outside to improve the rigidity of the liquid absorbent core itself and reduce the installation difficulty of the liquid absorbent core.

[0006] However, in this method, the wick is usually pressed into the shell, which undoubtedly carries the risk of damaging the wick structure. When the size of the wick and support is reduced to allow for a small gap between the wick and the inner wall of the shell, installation is easier, but poor contact can easily occur between the shell and the wick, affecting heat conduction.

[0007] Based on this, the inventors of this application propose a liquid-absorbing core, a heat pipe, and a method for manufacturing the same, in order to solve one or more of the aforementioned 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 absorber and the shell in the prior art, and to provide a liquid absorber, a heat pipe and a method for manufacturing the same.

[0009] The present invention solves the above-mentioned technical problems through the following technical solution: This invention provides a liquid-absorbing core, characterized in that it comprises: A first wire mesh loop and at least two second wire mesh loops, wherein the mesh count of the first wire mesh loop is greater than that of the second wire mesh loops, and at least two support rods are provided between adjacent second wire mesh loops, the support rods extending along the axial direction of the second wire mesh loops, the first wire mesh loop and at least two second wire mesh loops are integrally woven together, and the support rods between at least two second wire mesh loops are integrally woven together with the second wire mesh loops; wherein... The first wire mesh ring is elastically installed into the outer tube by applying a tensile force along the axial direction of the first wire mesh ring, so that the outer peripheral wall of the first wire mesh ring elastically abuts against the inner wall of the outer tube.

[0010] According to one embodiment of the present invention, the support rod is a hollow rod with a woven porous structure.

[0011] According to one embodiment of the present invention, one end of the first wire mesh ring is elastically abutting against the inner wall of the outer tube, and the other end is tightly attached to the adjacent second wire mesh ring.

[0012] According to one embodiment of the present invention, at least two of the support rods between adjacent second mesh rings are evenly distributed around the circumference of the second mesh ring, and the axial length of the support rods is consistent with the axial length of the second mesh ring.

[0013] According to one embodiment of the present invention, the first wire mesh loop and the second wire mesh loop are woven from an elastic nickel-based shape memory alloy; Alternatively, the first and second wire mesh rings may be woven from stainless steel high-temperature resistant and corrosion-resistant metal wires.

[0014] According to one embodiment of the present invention, the support rod is woven together with the adjacent second wire mesh loop.

[0015] 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 each 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.

[0016] According to one embodiment of the present invention, the interlayer spacing between adjacent second wire mesh loops is consistent, and the interlayer spacing is consistent with the outer diameter of the support rod.

[0017] The present invention also provides a heat pipe, comprising: outer tube; As described above, the liquid suction core is elastically installed inside the outer tube.

[0018] The present invention also provides a method for manufacturing a heat pipe, using the heat pipe described above, the method comprising: A preset tension is applied along the axial direction of the absorbent core to elongate the absorbent core and reduce its outer diameter; The elongated suction core is inserted into the outer tube; After the absorbing core has expanded and recovered, it forms contact with the inner wall of the outer tube, and end caps are installed on both sides of the outer tube.

[0019] The positive and progressive effects of this invention are as follows: The liquid-absorbing core of this 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. Furthermore, the second wire mesh ring is integrally woven with the first wire mesh ring, thus maintaining high rigidity in the overall structure of the liquid-absorbing core. During installation, only an axial tensile force is required to stretch the liquid-absorbing core along its axial direction, reducing its radial dimension, which allows the liquid-absorbing core to be easily installed into the outer tube. After installation, the liquid-absorbing core self-expands and fits against the inner wall of the outer tube, simplifying the installation process and improving the installation stability between the liquid-absorbing core and the outer tube. This completely avoids the problem of poor thermal conductivity caused by poor tightness in the installation of the traditional tube shell and liquid-absorbing core. Attached Figure Description

[0020] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein: Figure 1 This is a cross-sectional schematic diagram of the liquid-absorbing core of the present invention; Figure 2 This is an isometric view of an angle of the liquid-absorbing core of the present invention; Figure 3 This is a schematic diagram of the structure of one embodiment of the support rod of the present invention; Figure 4 This is a schematic diagram of another embodiment of the support rod of the present invention; Figure 5 This is a schematic diagram of the installation process between the liquid suction core and the outer tube of the present invention.

[0021] 1. First wire mesh ring; 2. Second wire mesh ring; 21. Circular cavity; 3. Support rod; 4. Outer tube. Detailed Implementation

[0022] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0024] Please refer to Figures 1 to 5 This 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 count of the first wire mesh ring 1 is greater than that 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 extend along the axial direction of the second wire mesh rings 2. The first wire mesh ring 1 and the at least two second wire mesh rings 2 are integrally woven together. The support rods 3 between the at least two second wire mesh rings 2 are also integrally woven together with the second wire mesh rings 2. The first wire mesh ring 1 is elastically installed into the outer tube 4 by applying a tensile force along the axial direction of the first wire mesh ring 1, so that the outer peripheral wall of the first wire mesh ring 1 elastically abuts against the inner wall of the outer tube 4.

[0025] It can be seen that the first wire mesh 1 is woven from thick and uniform metal wires, and the outer diameter of the first wire mesh 1 matches the inner diameter of the outer tube 4. By stretching the first wire mesh 1, the inner diameter of the first wire mesh 1 can be reduced, which facilitates the installation of the liquid suction core into the outer tube 4. When the tension is removed, the first wire mesh 1 returns to its original shape by its own elasticity, so that its outer wall fits tightly against the inner wall of the outer tube 4.

[0026] The first wire mesh ring 1 has at least two second wire mesh rings 2 inside. The first wire mesh ring 1 and the second wire mesh ring 2 are woven together as a single unit, which makes the overall rigidity of the liquid-absorbing core stronger. When a tensile force is applied along the axial direction of the first wire mesh ring 1, the second wire mesh ring 2 will also be pulled and deformed along the axial direction by the first wire mesh ring 1 because they are woven together as a single unit.

[0027] Adjacent second wire mesh rings 2 are connected and supported by at least two support rods 3, which can avoid the problem of collapse and deformation of high mesh count second wire mesh rings 2 and help maintain the normal circulation of working fluid in the pipe.

[0028] As can be seen, the installation method of the liquid suction core in this application is to axially stretch and reduce its outer diameter, and then install it into the outer tube 4. Thus, the first wire mesh ring 1 not only plays a role in enhancing the overall structural strength of the liquid suction core, but also forms an effective contact with the inner wall of the outer tube 4, thereby improving the heat conduction capacity of the liquid suction core.

[0029] Furthermore, the size of the annular cavity 21 between adjacent second wire mesh rings 2 can be adjusted according to the actual requirements for the size of the reflux chamber.

[0030] Please continue to refer to Figure 1 and Figure 2 The first wire mesh ring 1 can be a 20-mesh woven wire mesh ring, and the second wire mesh ring 2 can be a 400-mesh woven wire mesh ring. Thus, the second wire mesh ring 2 has a higher mesh count, smaller mesh spacing, and higher filtration accuracy. Meanwhile, the first wire mesh ring 1 has a relatively lower mesh count, wider mesh spacing, thicker wire diameter, higher overall strength, and better durability. Therefore, the first wire mesh ring 1 can enhance the overall structural strength of the liquid-absorbing core, while the second wire mesh ring 2 can maintain good media flow.

[0031] It is understood that the mesh count of the first wire mesh loop 1 and the second wire mesh loop 2 mentioned above is only an example and is not limited.

[0032] 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, providing more stable capillary action, ensuring efficient liquid reflux, and the woven wire mesh ring also has good mechanical strength and durability, and higher heat conduction efficiency.

[0033] It should be noted that the weaving process in this application can be achieved by a weaving machine, and the weaving requirements can be adjusted according to needs. The specific details are relatively common technical means in the field of weaving machines, and are not limited here.

[0034] Reference Figure 3 and Figure 4 The support rod 3 can be a woven solid rib rod or a hollow rod.

[0035] Preferably, the support rod 3 is a hollow rod with a woven porous structure, which can serve as a support to form the chamber required for the return of liquid working fluid, and also helps to improve the overall flowability of the liquid suction core.

[0036] Optionally, two, four, or six support rods 3 can be set between every two adjacent second wire mesh rings 2, and the specific number is not limited. Multiple support rods 3 can be evenly distributed around the circumference of the second wire mesh ring 2, thereby preventing the high mesh count second wire mesh ring 2 from collapsing and deforming, and thus maintaining the normal circulation of the working fluid inside the pipe.

[0037] 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. As a result, the support rod 3 has little effect on the reflux of the liquid working fluid during operation.

[0038] In one embodiment, the support rod 3 is woven together with the adjacent second wire mesh ring 2. Thus, the support rod 3 not only supports the annular cavity 21 between the adjacent second wire mesh rings 2, but also connects the adjacent second wire mesh rings 2, thereby improving the overall structural strength of the liquid absorption core.

[0039] It can be seen that different numbers of second wire mesh rings 2 can be set according to the size of the return annular cavity 21. Moreover, 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.

[0040] Please refer to Figure 5 The following describes the weaving and installation process of the absorbent core: A first wire mesh loop 1 with a low mesh count is woven using elastic, high-temperature resistant, and corrosion-resistant metal wires, and multiple second wire mesh loops 2 with a high mesh count are woven using metal wires with an even smaller diameter.

[0041] During the weaving process, the first wire mesh 1 with a low mesh count, the second wire mesh 2 with a high mesh count, and the support rod 3 are woven together, while keeping the outer diameter of the first wire mesh 1 slightly smaller than the inner diameter of the outer tube 4, and the diameter of the support rod 3 consistent with the interlayer spacing of the adjacent second wire mesh 2.

[0042] After the overall structure is woven, an axial tensile force is applied to stretch the absorbent core to a length with a diameter smaller than the inner diameter of the outer tube 4, and the absorbent core is inserted into the outer tube 4. Due to the elasticity of the first wire mesh ring 1 and the second wire mesh ring 2, they expand after the external force is removed and return to their original shape, 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 absorbent core.

[0043] The following describes the weaving and installation process of the absorbent core according to one embodiment: First, prepare elastic nickel-based shape memory alloy or stainless steel high-temperature and corrosion-resistant metal wire. Use metal wire with a diameter of 0.3 mm to weave a layer of 20-mesh braided wire mesh, corresponding to the first wire mesh 1, and at the same time make the outer diameter of the first wire mesh 1 correspond to the inner diameter of the outer tube 4.

[0044] Then, using metal wire with a diameter of 0.025 mm, three layers of 400-mesh braided wire mesh are woven, corresponding to three second wire mesh loops 2. During the weaving process, it is integrally formed with a layer of 20-mesh braided wire mesh loop (first wire mesh loop 1) and a hollow or solid braided rod (support rod 3). The spacing between adjacent layers of the three second wire mesh loops 2 is 0.17 mm, that is, the diameter of the support rod 3 is 0.017 mm.

[0045] After the absorbent core is woven, it is stretched and lengthened by applying tension along the axial direction, reducing the structural diameter so that it can be smoothly fed into the outer tube 4. After the absorbent core enters the outer tube 4, due to the elasticity of the material itself, it restores its original shape through self-expansion and fits tightly against the inner wall of the outer tube 4.

[0046] The present invention also proposes a heat pipe, including an outer tube 4 and the aforementioned liquid-absorbing core, wherein the liquid-absorbing core is elastically installed inside the outer tube 4.

[0047] This invention also proposes a method for manufacturing a heat pipe, comprising: A preset tension is applied along the axial direction of the suction core to elongate the suction core and reduce its outer diameter. Insert the elongated suction core into the outer tube; After the absorbing core has expanded and recovered, it forms contact with the inner wall of the outer tube. Then, end caps are installed on both sides of the outer tube.

[0048] As described above, the liquid-absorbing core, heat pipe, and manufacturing method proposed in this invention have at least the following beneficial effects: First, the first wire mesh ring has a low mesh count, resulting in good elasticity and rigidity, which helps the liquid suction core maintain a certain level of rigidity. At least two second wire mesh rings are installed inside the first wire mesh ring, and adjacent second wire mesh rings are connected by support rods. This solves the problem of high-mesh-count second wire mesh rings being prone to collapse and deformation, and helps maintain the normal circulation of the working fluid inside the tube.

[0049] Second, the liquid-absorbing core is made by braiding, and is formed by braiding elastic nickel-based shape memory alloy or stainless steel high-temperature and corrosion-resistant metal wire. Therefore, only a certain external force needs to be applied 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 liquid-absorbing core returns to its original state due to its own elasticity, achieving a tight fit with the inner wall of the outer tube, solving the problem of inconvenient installation of traditional liquid-absorbing cores.

[0050] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation", "connection", "joining", and "fixing" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can also refer to mechanical connections. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0051] This application uses specific terms to describe embodiments of the application. Terms such as "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that references to "an embodiment," "one embodiment," or "an alternative embodiment" in different locations throughout this specification do not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0052] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. A liquid-absorbing core, characterized in that, include: A first wire mesh loop and at least two second wire mesh loops, wherein the mesh count of the first wire mesh loop is greater than that of the second wire mesh loops, and at least two support rods are provided between adjacent second wire mesh loops, the support rods extending along the axial direction of the second wire mesh loops, the first wire mesh loop and at least two second wire mesh loops are integrally woven together, and the support rods between at least two second wire mesh loops are integrally woven together with the second wire mesh loops; wherein... The first wire mesh ring is elastically installed into the outer tube by applying a tensile force along the axial direction of the first wire mesh ring, so that the outer peripheral wall of the first wire mesh ring elastically abuts against the inner wall of the outer tube.

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

3. The absorbent core according to claim 1, characterized in that, One end of the first wire mesh ring is elastically abutted against the inner wall of the outer tube, and the other end is tightly attached to the adjacent second wire mesh ring.

4. The absorbent core according to claim 1, characterized in that, At least two of the support rods between adjacent second mesh rings are evenly distributed around the circumference of the second mesh ring, and the axial length of the support rods is consistent with the axial length of the second mesh ring.

5. The absorbent core according to claim 1, characterized in that, The first and second wire mesh loops are woven from an elastic nickel-based shape memory alloy; Alternatively, the first and second wire mesh rings may be woven from stainless steel high-temperature resistant and corrosion-resistant metal wires.

6. The absorbent core according to claim 1, characterized in that, The support rods are woven together with the adjacent second wire mesh loops.

7. The absorbent core according to claim 1, characterized in that, 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, characterized in that, 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.

9. A heat pipe, characterized in that, include: outer tube; The liquid suction core as described in any one of claims 1-8 is elastically installed inside the outer tube.

10. A method for manufacturing a heat pipe, characterized in that, The manufacturing method of the heat pipe as described in claim 9 includes: A preset tension is applied along the axial direction of the absorbent core to elongate the absorbent core and reduce its outer diameter; The elongated suction core is inserted into the outer tube; After the absorbing core has expanded and recovered, it forms contact with the inner wall of the outer tube, and end caps are installed on both sides of the outer tube.

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