Preparation process of porous spiral woven mesh wick and heat pipe

Abstract

The invention discloses a preparation process of a porous spiral woven mesh wick and a heat pipe, and the preparation process comprises the following steps: winding: selecting at least two metal wire rods with different wire diameters, and winding a plurality of metal wires through a winding machine according to a required winding shape to obtain a plurality of metal wire ingots, a plurality of metal wires in the metal wire spindle form a braided wire, and each braided wire comprises at least two kinds of metal wires with different wire diameters; weaving: placing the plurality of metal wire ingots in a weaving machine, weaving the metal wire ingots through the weaving machine, enabling the plurality of weaving wires to be spirally interwoven in order to form a tubular fabric, and then continuously weaving the outer side of the tubular fabric through the weaving machine to form a braided fabric with a plurality of layers of tubular fabrics; and sintering: placing the braided fabric in the inner cavity of the pipe body of the heat pipe, and sintering and heating the braided fabric through a heating device so as to form a wick in the inner cavity of the pipe body of the heat pipe. The porosity of the prepared wick can be improved, and the performance of the heat pipe can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of heat pipe production, and in particular to a preparation process of a porous spiral woven mesh liquid-absorbing core and a heat pipe. Background Art

[0002] A heat pipe is a heat transfer element that utilizes the principle of heat conduction and the rapid heat transfer properties of a phase change medium. When in use, the heat from the heat source is transferred to one end of the heat pipe, causing the working fluid in the pipe to absorb heat and vaporize and flow to the other end of the heat pipe under the action of a pressure difference. After encountering a cold source, the working fluid dissipates heat and condenses into liquid, which is then returned from the cold source to the heat source under the capillary action of the liquid wick inside the heat pipe, and the cycle continues in this way to achieve the purpose of rapid heat conduction. The liquid wick inside the existing heat pipe is partially sintered to form a metal braided mesh structure. The preparation of the existing braided mesh liquid wick is usually formed by weaving multiple metal wires in an interlaced manner, and the structure is relatively simple. The porosity of the capillary structure is low, which affects the efficiency of liquid absorption and heat transfer. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a preparation process of a porous spiral woven mesh liquid absorbent core, which can improve the porosity of the prepared liquid absorbent core by weaving a woven wire composed of a plurality of metal wires of different wire diameters to form a woven fabric with multiple layers of tubular fabrics, which is beneficial to improving the performance of the heat pipe.

[0004] The invention also provides a heat pipe produced by using the preparation process of the porous spiral woven mesh liquid-absorbing core.

[0005] The preparation process of the porous spiral woven mesh absorbent core according to the first aspect of the present invention comprises the following steps:

[0006] Winding, selecting at least two metal wires with different wire diameters, and winding a plurality of metal wires through a winding machine according to a desired winding shape to obtain a plurality of metal wire ingots, wherein the plurality of metal wires in the metal wire ingots constitute braided wires for braiding, and each braided wire comprises at least two metal wires with different wire diameters;

[0007] Weaving, placing a plurality of metal wire spindles in a weaving machine and performing weaving processing through the weaving machine, so that a plurality of weaving wires are orderly spirally interwoven to form a tubular fabric, and then continuing to perform weaving processing through the weaving machine on the outside of the tubular fabric to form a braided fabric with multiple layers of tubular fabric;

[0008] Sintering, placing the braid in the inner cavity of the heat pipe and sintering and heating it by a heating device to form a liquid wick in the inner cavity of the heat pipe.

[0009] According to the preparation process of the porous spiral woven mesh liquid-absorbent core described in the embodiment of the present invention, it has at least the following beneficial effects: when performing the winding step, by selecting at least two metal wires with different wire diameters for winding processing, the braided wire in the wound metal wire ingot contains at least two metal wires with different wire diameters, so as to increase the concavity of the surface of the braided wire; when performing the braiding step, the braided fabric obtained by braiding has a tubular fabric with a multi-layer three-dimensional structure, so as to have more irregular gaps and holes, so that the liquid-absorbent core obtained by sintering has more irregular gaps and holes, thereby improving the porosity of the liquid-absorbent core, thereby improving the liquid absorption and heat transfer efficiency of the liquid-absorbent core, which is beneficial to improving the performance of the heat pipe.

[0010] According to some embodiments of the present invention, the braided wire can be divided into at least two types, and the wire diameters of the metal wires included in the different types of braided wires are different.

[0011] According to some embodiments of the present invention, the tubular fabrics in different layers of the braided fabric respectively use different types of braiding wires.

[0012] According to some embodiments of the present invention, the wire diameter dimension A of the metal wire has a value range of: 0.03 mm ≤ A ≤ 0.1 mm.

[0013] According to some embodiments of the present invention, the difference B between different wire diameters of the metal wire has a value range of: 0.01 mm≤B≤0.03 mm.

[0014] According to some embodiments of the present invention, the number C of metal wires included in the braided wire is in the range of 4≤C≤10.

[0015] According to some embodiments of the present invention, a value range of a ratio D of the number of metal wires of different diameters in the same braided wire is: 0.5≤D≤1.5.

[0016] According to some embodiments of the present invention, the number of layers E of the tubular fabric included in the braided fabric is in the range of 3≤E≤5.

[0017] According to some embodiments of the present invention, the braid is rolled and cleaned before the sintering step.

[0018] The heat pipe according to the second aspect of the present invention comprises a liquid absorbent core made by the preparation process of the porous spiral woven mesh liquid absorbent core according to the first aspect of the present invention.

[0019] The heat pipe according to the embodiment of the present invention has at least the following beneficial effects: by adopting the above-mentioned preparation process of the porous spiral woven mesh liquid absorbent core, the porosity of the prepared liquid absorbent core can be increased, which is beneficial to improving the performance of the heat pipe.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 It is a simplified structural schematic diagram of a tubular fabric in the preparation process of an embodiment of the present invention;

[0023] Figure 2 It is a simplified structural schematic diagram of a braided fabric in the preparation process of an embodiment of the present invention.

[0024] Reference numerals:

[0025] Braided wire 10 , tubular fabric 20 , braided fabric 30 . DETAILED DESCRIPTION

[0026] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] In the description of the present invention, it is necessary to understand that if it involves orientation description, the orientation or position relationship indicated by, for example, up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] In the description of the present invention, if the words such as several, greater than, less than, exceed, above, below, within, etc. appear, among which, several means one or more, more means more than two, greater than, less than, exceed, etc. are understood as not including the number itself, and above, below, within, etc. are understood as including the number itself.

[0029] If the first and second are described, they are only used to distinguish the technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0031] Reference Figure 1 and Figure 2 A process for preparing a porous spiral woven mesh liquid-absorbing core comprises the following steps:

[0032] Winding, selecting at least two metal wires with different wire diameters, and winding a plurality of metal wires through a winding machine according to a desired winding shape to obtain a plurality of metal wire ingots, wherein the plurality of metal wires in the metal wire ingots constitute a braided wire 10 for braiding, and each braided wire 10 comprises at least two metal wires with different wire diameters;

[0033] Weaving, placing a plurality of metal wire spindles in a weaving machine and performing weaving processing through the weaving machine, so that a plurality of braided wires 10 are orderly spirally interwoven to form a tubular fabric 20, and then continuing to perform weaving processing through the weaving machine on the outside of the tubular fabric 20 to form a braided fabric 30 having multiple layers of tubular fabrics 20;

[0034] Sintering: placing the braid 30 in the inner cavity of the heat pipe and sintering and heating it by a heating device to form a liquid wick in the inner cavity of the heat pipe.

[0035] It is understandable that when performing the winding step, at least two metal wires with different wire diameters are selected for winding processing, and the braided wire 10 in the wound metal wire ingot contains at least two metal wires with different wire diameters to increase the degree of concavity on the surface of the braided wire 10; when performing the weaving step, the braided fabric 30 obtained by weaving has a tubular fabric 20 with a multi-layer three-dimensional structure, so as to have more irregular gaps and holes, so that the sintered liquid absorbent core has more irregular gaps and holes, thereby increasing the porosity of the liquid absorbent core, thereby improving the liquid absorption and heat transfer efficiency of the liquid absorbent core, which is beneficial to improving the performance of the heat pipe.

[0036] Specifically, in the winding step, when a plurality of metal wires of different wire diameters are made into a metal wire ingot, the metal wires of the same wire diameter are arranged together and wound on the winding machine in an ascending order of wire diameter, so that the two sides of the same braided wire 10 present a high and low change. In actual application, two or three metal wires of different wire diameters can be selected for winding. Of course, the number of wire diameter types of the metal wires can also be four or more, which can be set accordingly according to actual use needs.

[0037] In some embodiments, the braided wire 10 can be divided into at least two types, and the wire diameters of the metal wires contained in different types of braided wires 10 are different. It is understandable that when performing the winding step, three types of metal wires with different wire diameters can be selected, such as three different wire diameters of a, b, and c, among which two combinations can be selected, such as ab, bc, and ac to form three combinations, so that the braided wire 10 is divided into three types, and there is at least one metal wire with a different wire diameter from each other; or, four types of metal wires with different wire diameters are selected, such as a, b, c, and d, which can form two combinations of ab and cd, so that the braided wire 10 is divided into two types, and the wire diameters of the metal wires are different from each other. By setting a plurality of braided wires 10 to increase the difference, it is beneficial for the braid 30 to form more irregular gaps and holes. In actual application, the type of braided wire 10 can also be one, and the difference design of different braided wires 10 can be set accordingly according to actual use needs.

[0038] In some embodiments, different layers of tubular fabrics 20 in the braided fabric 30 use different types of braiding wires 10. It is understandable that when performing the braiding step, different layers of tubular fabrics 20 can be braided with different types of braided fabrics 30. For example, the braiding wires 10 are provided in three types, namely, e, f, and g. The braided fabric 30 has three layers of tubular fabrics 20, wherein the three layers of tubular fabrics 20 can respectively use three types of braiding wires 10, namely, e, f, and g, so that the braiding wires 10 used between each layer of tubular fabrics 20 are different, or the three layers of tubular fabrics 20 can respectively use three combinations of braiding wires 10, namely, ef, fg, and eg, so that there is at least one different type of braiding wire 10 between each layer. By setting different layers of tubular fabrics 20 to use different types of braiding wires 10, the difference is increased, which is conducive to the formation of more irregular gaps and holes in the braided fabric 30. In actual application, the type of braided wire 10 can also be one, and each layer of tubular fabric 20 uses the same type of braided wire 10. The differential design of different layers of tubular fabric 20 can be set accordingly according to actual use needs.

[0039] In some embodiments, the wire diameter dimension A of the metal wire has a value range of: 0.03mm≤A≤0.1mm. It is understandable that when performing the winding step, if the wire diameter dimension A of the metal wire is less than 0.03mm, the wire is prone to breakage during the winding process. If it is greater than 0.1mm, the obtained metal wire ingot is relatively unstable. It is more appropriate to select a metal wire with a wire diameter dimension of 0.03mm to 0.1mm (including the endpoint values), which is conducive to the winding step and the subsequent weaving step. In actual application, the wire diameter dimension A of the metal wire can be 0.03mm, 0.06mm, 0.08mm or 0.1mm, which can be set accordingly according to actual use needs.

[0040] In some embodiments, the value range of the difference B between different wire diameters of the metal wire is: 0.01mm≤B≤0.03mm. It is understandable that when performing the winding step, since at least two metal wires with different wire diameters need to be selected, there is a difference B between the metal wires with different wire diameters. Through experiments, when the difference B between the different wire diameters of the metal wire satisfies the range of 0.01mm≤B≤0.03mm, the porosity of the obtained liquid absorbent core is relatively large, and when the difference B between the different wire diameters of the metal wire is less than 0.01mm or greater than 0.03mm, the porosity of the obtained liquid absorbent core is relatively reduced. Therefore, the value range of the difference B between different wire diameters of the metal wire is set to: 0.01mm≤B≤0.03mm, which is beneficial to the porosity of the liquid absorbent core, improves the efficiency of liquid absorption and heat transfer of the liquid absorbent core, and thus improves the performance of the heat pipe. In actual application, the difference B between different wire diameters of the metal wire is preferably 0.02 mm. Of course, it can also be 0.01 mm or 0.03 mm, which can be set accordingly according to actual use needs.

[0041] In some embodiments, the number C of metal wires contained in the braided wire 10 has a value range of 4≤C≤10. It is understandable that if the number C of metal wires contained in the same braided wire 10 is less than 4, the obtained metal wire ingot is relatively loose, and if it is greater than 10, the obtained metal wire ingot is too tight; it is more appropriate to select 4 to 10 (including the endpoint values) metal wires, which is conducive to the winding step and the subsequent braiding step. In actual application, the number C of metal wires contained in the braided wire 10 can be 4, 6, 8 or 10 mm, which can be set accordingly according to actual use needs.

[0042] In some embodiments, the value range of the ratio D of the number of metal wires of different wire diameters in the same braided wire 10 is: 0.5≤D≤1.5. It is understandable that the same braided wire 10 contains metal wires of at least two wire diameters and there are multiple metal wires. For example, in the same braided wire 10, there are x wires of wire diameter a and y wires of wire diameter b. Then the value range D of the number of metal wires of different wire diameters in the same braided wire 10 is: D=x / y or D=y / x. Through experiments, when the value range D of the number of metal wires of different wire diameters in the same braided wire 10 satisfies the range of 0.5≤D≤1.5, the porosity of the obtained liquid absorbent core is relatively large, and when the ratio D is less than 0.5 or greater than 1.5, the porosity of the obtained liquid absorbent core is relatively reduced. Therefore, the value range of the value range of the ratio D of the number of metal wires of different wire diameters in the same braided wire 10 is set to: 0.5≤D≤1.5, which is beneficial to improving the performance of the heat pipe. In actual application, the ratio D of the number of metal wires of different diameters in the same braided wire 10 is preferably 1, that is, the metal wires of different diameters in the same braided wire 10 are preferably the same number. For example, a braided wire 10 contains 6 metal wires. If the metal wires have two wire diameters, the number of each metal wire in the same braided wire 10 is preferably 3. If the metal wires have three wire diameters, the number of each metal wire in the same braided wire 10 is preferably 2. Of course, the ratio D can also be 0.5 or 1.5 or other values ​​between 0.5 and 1.5, which can be set accordingly according to actual usage needs.

[0043] In some embodiments, the number of layers E of the tubular fabric 20 included in the braid 30 has a value range of 3≤E≤5. It is understandable that when the braiding step is performed, if the number of layers E of the tubular fabric 20 included in the braid 30 is less than 3, the braid 30 obtained is smaller, and there are fewer gaps and holes. If it is greater than 5, the braid 30 obtained is larger, which occupies the gas flow space in the heat pipe and affects the performance of the heat pipe. It is more appropriate to select a braid 30 with 3 to 5 layers (including the endpoint value) of tubular fabric 20, which is conducive to ensuring that the heat pipe has better performance. In actual application, the number of layers E of the tubular fabric 20 included in the braid 30 can be 3, 4 or 5, which can be set accordingly according to actual use needs.

[0044] Specifically, in the weaving step, a weaving machine with a yarn carrier is used, and metal wire spindles with different parameters are evenly and alternately arranged on the yarn carrier. This arrangement can ensure the stability of the tubular fabric 20 obtained by spiral interweaving and is convenient for weaving.

[0045] In some embodiments, the braid 30 is rolled and cleaned before the sintering step. It is understandable that after the braiding step and before the sintering step, the braid 30 can be rolled by a rolling device to process it into a flat structure, which is convenient for inserting it into the tube body, reducing the possibility of flexible bending or undulation during the insertion process, and is conducive to controlling the shape of shrinkage and collapse after sintering; the braid 30 can be cleaned by a cleaning device to remove oil or other impurities thereon for easy use. In actual application, rolling and cleaning can be selected according to actual use needs, and are not limited here.

[0046] The heat pipe according to the second embodiment of the present invention comprises a liquid absorbent core made by the preparation process of the porous spiral woven mesh liquid absorbent core according to the first embodiment of the present invention.

[0047] According to the heat pipe of the embodiment of the present invention, by adopting the above-mentioned preparation process of the porous spiral woven mesh liquid absorbent core, the porosity of the prepared liquid absorbent core can be increased, which is beneficial to improving the performance of the heat pipe.

[0048] Since other components of the heat pipe according to the embodiment of the present invention are known to those skilled in the art, they will not be described in detail here.

[0049] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A process for preparing a porous spiral woven mesh liquid absorbent core, characterized in that: The following steps are involved: Winding, selecting at least two metal wires with different wire diameters, and winding a plurality of metal wires through a winding machine according to a desired winding shape to obtain a plurality of metal wire ingots, wherein the plurality of metal wires in the metal wire ingots constitute braided wires for braiding, and each braided wire comprises at least two metal wires with different wire diameters; Weaving, placing a plurality of metal wire spindles in a weaving machine and performing weaving processing through the weaving machine, so that a plurality of weaving wires are orderly spirally interwoven to form a tubular fabric, and then continuing to perform weaving processing through the weaving machine on the outside of the tubular fabric to form a braided fabric with multiple layers of tubular fabric; Sintering, placing the braid in the inner cavity of the heat pipe and sintering and heating it by a heating device to form a liquid wick in the inner cavity of the heat pipe.

2. The process for preparing the porous spiral woven mesh liquid absorbent core according to claim 1, characterized in that: The braided wire can be divided into at least two types, and the wire diameters of the metal wires contained in the different types of braided wires are different.

3. The process for preparing the porous spiral woven mesh liquid absorbent core according to claim 2, characterized in that: The tubular fabrics of different layers in the braided fabric respectively use different types of braiding wires.

4. The process for preparing the porous spiral woven mesh liquid absorbent core according to claim 1, characterized in that: The value range of the wire diameter dimension A of the metal wire is: 0.03mm≤A≤0.1mm.

5. The process for preparing the porous spiral woven mesh liquid absorbent core according to claim 1, characterized in that: The value range of the difference B between different wire diameters of the metal wire is: 0.01mm≤B≤0.03mm.

6. The process for preparing the porous spiral woven mesh liquid absorbent core according to claim 1, characterized in that: The number C of metal wires contained in the braided wire has a value range of 4≤C≤10.

7. The process for preparing the porous spiral woven mesh liquid absorbent core according to claim 1, characterized in that: The value range of the ratio D of the number of metal wires of different wire diameters in the same braided wire is: 0.5≤D≤1.

5.

8. The process for preparing the porous spiral woven mesh liquid absorbent core according to claim 1, characterized in that: The number of layers E of the tubular fabric included in the braided fabric is in the range of 3≤E≤5.

9. The process for preparing the porous spiral woven mesh liquid absorbent core according to claim 1, characterized in that: Before the sintering step, the braid is rolled and cleaned.

10. A heat pipe, characterized in that: The invention comprises a liquid absorbent core made by adopting the preparation process of the porous spiral woven mesh liquid absorbent core according to any one of claims 1 to 9.

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