Process for making porous spiral-wound mesh wick and heat pipe

Abstract

The application discloses a preparation process of a porous spiral woven mesh liquid absorption core and a heat pipe. The preparation process comprises the following steps: winding, selecting at least two kinds of metal wire materials with different diameters, winding a plurality of metal wires through a winding machine according to a required winding shape to prepare a plurality of metal wire spindles, wherein the plurality of metal wires in the metal wire spindles form woven wires, and each woven wire comprises at least two kinds of metal wires with different diameters; weaving, placing the plurality of metal wire spindles in a weaving machine and weaving through the weaving machine to orderly spiral interweave the plurality of woven wires, form a tubular fabric, and then continue to weave through the weaving machine on the outside of the tubular fabric to form a woven fabric with a plurality of tubular fabrics; sintering, placing the woven fabric in the inner cavity of the pipe body of the heat pipe and sintering and heating through a heating device to form the liquid absorption core in the inner cavity of the pipe body of the heat pipe. The application can improve the porosity of the prepared liquid absorption core and is beneficial to improving the performance of the heat pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat pipe production, in particular to a preparation process of a porous spiral woven mesh liquid absorption core and a heat pipe. BACKGROUND

[0002] A heat pipe is a heat transfer element that utilizes the principle of heat conduction and the rapid heat transfer properties of phase change medium. When in use, the heat from the heat source is transferred to one end of the heat pipe, causing the working liquid in the heat pipe to absorb heat and vaporize, and then flow to the other end of the heat pipe under the action of pressure difference. When encountering the cold source, the working liquid condenses into liquid and returns to the heat source under the capillary action of the liquid absorption core in the heat pipe, thus forming a cycle to achieve the purpose of rapid heat conduction. For the liquid absorption core inside the existing heat pipe, part of the liquid absorption core is sintered by using a metal woven mesh structure. For the preparation of the existing woven mesh liquid absorption core, the woven mesh is usually composed of multiple metal wires that are woven in an interlaced manner. The structure is relatively simple, and the porosity of the capillary structure is low, which affects the efficiency of liquid absorption and heat transfer. SUMMARY

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application provides a preparation process of a porous spiral woven mesh liquid absorption core. The woven mesh is formed by weaving multiple woven wires composed of metal wires with different diameters and has multiple layers of tubular fabric. This can improve the porosity of the prepared liquid absorption core and improve the performance of the heat pipe.

[0004] The present application also provides a heat pipe produced by the preparation process of the porous spiral woven mesh liquid absorption core.

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

[0006] Winding: selecting metal wire materials with at least two different wire diameters, winding multiple metal wires through a winding machine according to the required winding shape to obtain multiple metal wire spindles, wherein the multiple metal wires in the metal wire spindles form woven wires for weaving, and each woven wire contains at least two metal wires with different diameters;

[0007] Weaving: placing the multiple metal wire spindles in a weaving machine and weaving them through the weaving machine to form a tubular fabric by orderly and spirally interweaving the multiple woven wires. Then, continue to weave the tubular fabric through the weaving machine to form a woven mesh with multiple layers of tubular fabric.

[0008] Sintering: placing the woven mesh in the inner cavity of the pipe body of the heat pipe and sintering it through a heating device to form a liquid absorption core in the inner cavity of the pipe body of the heat pipe.

[0009] The preparation process of the porous spiral woven mesh liquid absorbing core has at least the following beneficial effects: during the winding step, the winding is performed by selecting at least two kinds of metal wire materials with different wire diameters, and the woven wire in the metal wire spindle is composed of at least two kinds of metal wires with different wire diameters, so as to increase the concave-convex degree of the surface of the woven wire; during the weaving step, the woven fabric obtained by weaving has a tubular fabric with a multi-layer three-dimensional structure, so as to have more irregular gaps and holes, so that the sintered liquid absorbing core has more irregular gaps and holes, the porosity of the liquid absorbing core is improved, the efficiency of liquid absorption and heat transfer of the liquid absorbing core is improved, and the performance of the heat pipe is improved.

[0010] According to some embodiments of the present application, the woven wire can be at least two kinds, and the woven wires of different kinds are composed of metal wires with different wire diameters.

[0011] According to some embodiments of the present application, the tubular fabrics of different layers in the woven fabric are respectively composed of different kinds of woven wires.

[0012] According to some embodiments of the present application, the wire diameter size A of the metal wire is in the range of 0.03mm≤A≤0.1mm.

[0013] According to some embodiments of the present application, the difference B between the wire diameters of the metal wires is in the range of 0.01mm≤B≤0.03mm.

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

[0015] According to some embodiments of the present application, the ratio D of the number of metal wires with different wire diameters in the same woven wire is in the range of 0.5≤D≤1.5.

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

[0017] According to some embodiments of the present application, the woven fabric is rolled and cleaned before the sintering step.

[0018] The heat pipe according to the second aspect of the embodiments of the present application comprises a liquid absorbing core prepared by the preparation process of the porous spiral woven mesh liquid absorbing core according to the first aspect of the embodiments of the present application.

[0019] The heat pipe according to the embodiments of the present application has at least the following beneficial effects: by using the above-mentioned preparation process of the porous spiral woven mesh liquid absorbing core, the porosity of the prepared liquid absorbing core can be improved, and the performance of the heat pipe is improved.

[0020] Additional aspects and advantages of the present application will be set forth in part in the description which follows, and in part will become apparent to those having ordinary skill in the art upon examination of the following or can be learned from practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the description of the embodiments, given by reference to the following drawings:

[0022] Figure 1 Schematic diagram of simple structure of tubular fabric in preparation process of embodiment of the present application;

[0023] Figure 2 Schematic diagram of simple structure of woven fabric in preparation process of embodiment of the present application.

[0024] REFERENCE NUMERALS

[0025] Woven thread 10, tubular fabric 20, woven fabric 30. DETAILED DESCRIPTION

[0026] Embodiments of the present application are described in detail below with reference to the attached drawings, which show by way of example embodiments in which the same or similar elements or elements having the same or similar functions are denoted by the same reference numerals throughout the drawings. The embodiments described below with reference to the drawings are exemplary and are intended only for the purpose of explaining the present application, and should not be construed as limiting the present application.

[0027] In the description of the present application, it should be understood that, if orientation description is involved, for example, the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as limiting the present application, which does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation.

[0028] In the description of the present application, if the words several, more than, less than, exceed, above, below, within, etc. appear, the meaning of several is one or more, the meaning of more than is two or more, the meanings of less than, exceed, etc. are not including the number, and the meanings of above, below, within, etc. are including the number.

[0029] If it is described that the first, second is only for the purpose of distinguishing technical features, it cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of technical features indicated.

[0030] In the description of the present application, unless otherwise explicitly limited, the words setting, installing, connecting, etc. should be understood broadly, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0031] Referring to Figure 1 and Figure 2 A preparation process of a porous spiral woven mesh liquid absorbing core, comprising the following steps:

[0032] Winding, selecting at least two kinds of metal wire materials with different diameters, winding a plurality of metal wires through a winding machine according to a required winding shape to obtain a plurality of metal wire spindles, wherein the plurality of metal wires in the metal wire spindles form weaving wires 10 for weaving, and each weaving wire 10 contains at least two kinds of metal wires with different diameters;

[0033] Weaving, placing the plurality of metal wire spindles in a weaving machine and weaving through the weaving machine to orderly spiral interweave the plurality of weaving wires 10 to form a tubular fabric 20, and then continuing to weave through the weaving machine on the outside of the tubular fabric 20 to form a woven fabric 30 with a plurality of layers of tubular fabrics 20;

[0034] Sintering, placing the woven fabric 30 in the inner cavity of the tube body of the heat pipe and sintering heating through a heating device to form a liquid absorbing core in the inner cavity of the tube body of the heat pipe.

[0035] It can be understood that when the winding step is performed, the winding is performed by selecting at least two kinds of metal wire materials with different diameters, and the weaving wires 10 in the wound metal wire spindles contain at least two kinds of metal wires with different diameters to increase the degree of concave-convex on the surface of the weaving wires 10; when the weaving step is performed, the woven fabric 30 obtained by weaving has a plurality of layers of tubular fabrics 20 with a three-dimensional structure to have more irregular gaps and holes, so that the sintered liquid absorbing core has more irregular gaps and holes, thereby improving the porosity of the liquid absorbing core, and improving the efficiency of liquid absorption and heat transfer of the liquid absorbing core, which is beneficial to improving the performance of the heat pipe.

[0036] Specifically, in the winding step, when a plurality of metal wires with different diameters are made into metal wire spindles, the metal wires with the same diameter are arranged together and arranged in the winding machine in the order of small to large according to the diameter, so that the two sides of the same weaving wire 10 present a high-low change. In actual application, two or three kinds of metal wire materials with different diameters can be selected for winding. Of course, the number of types of diameters of the metal wires can also be four or more, which can be set according to actual 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 included in the different types of braided wire 10 are different. It can be understood that, when performing the winding step, metal wires with three different wire diameters, such as a, b, and c, can be selected, and two-by-two combinations, such as ab, bc, and ac, can be selected to form three combinations, so that the braided wire 10 is divided into three types, and at least one type of metal wire is different between each other. Alternatively, metal wires with four different wire diameters, such as a, b, c, and d, can be selected, and two combinations, such as ab and cd, can be selected, so that the braided wire 10 is divided into two types, and the wire diameters of the metal wires are different between each other. By providing multiple types of braided wire 10, the difference is increased, which is beneficial for the woven fabric 30 to form more irregular gaps and holes. In actual application, the types of braided wire 10 can also be one type, and the difference between different braided wires 10 can be set according to actual use needs.

[0038] In some embodiments, the tubular fabric 20 of different layers in the woven fabric 30 is made of different types of braided wire 10. It can be understood that, when performing the weaving step, the tubular fabric 20 of different layers can be woven by different types of woven fabric 30. For example, the braided wire 10 is provided with three types of e, f, and g, and the woven fabric 30 has three layers of tubular fabric 20, wherein the three layers of tubular fabric 20 can be made of three types of braided wire 10, e, f, and g, so that the braided wire 10 used between each layer of tubular fabric 20 is different, or the three layers of tubular fabric 20 can be made of three combinations of braided wire 10, ef, fg, and eg, so that at least one type of braided wire 10 is different between each layer. By providing different layers of tubular fabric 20 with different types of braided wire 10, the difference is increased, which is beneficial for the woven fabric 30 to form more irregular gaps and holes. In actual application, the types of braided wire 10 can also be one type, and the same type of braided wire 10 is used for each layer of tubular fabric 20, and the difference between the tubular fabric 20 of different layers can be set according to actual use needs.

[0039] In some embodiments, the wire diameter size A of the metal wire is in the range of 0.03mm≤A≤0.1mm. It can be understood that, when performing the winding step, if the wire diameter size A of the metal wire is less than 0.03mm, the wire may be easily broken during winding, and if it is greater than 0.1mm, the metal wire spindle obtained is relatively unstable; it is more appropriate to select a metal wire with a wire diameter size of 0.03mm to 0.1mm (including the end point value), which is beneficial for the winding step and the subsequent weaving step. In actual application, the wire diameter size A of the metal wire can be 0.03mm, 0.06mm, 0.08mm, or 0.1mm, which can be set according to actual use needs.

[0040] In some embodiments, the difference B between the different diameters of the metal wires ranges from 0.01 mm to 0.03 mm. It can be understood that, when performing the winding step, since at least two metal wires with different diameters need to be selected, there is a difference B between the metal wires with different diameters. Through experiments, it is found that when the difference B between the different diameters of the metal wires ranges from 0.01 mm to 0.03 mm, the prepared wick has a larger porosity, and when the difference B between the different diameters of the metal wires is less than 0.01 mm or greater than 0.03 mm, the porosity of the prepared wick is relatively reduced. Therefore, the difference B between the different diameters of the metal wires ranges from 0.01 mm to 0.03 mm, which is beneficial to the porosity of the wick, improves the efficiency of liquid absorption and heat transfer of the wick, and thus improves the performance of the heat pipe. In practical applications, the difference B between the different diameters of the metal wires is preferably 0.02 mm, and of course it can also be 0.01 mm or 0.03 mm. The specific value can be set according to actual needs.

[0041] In some embodiments, the number C of metal wires contained in the braided wire 10 ranges from 4 to 10. It can be understood that if the number C of metal wires contained in the same braided wire 10 is less than 4, the prepared metal wire spindle is relatively loose, and if the number C of metal wires is greater than 10, the prepared metal wire spindle is too tight; it is more appropriate to select 4 to 10 metal wires (including the end point value), which is beneficial to the winding step and the subsequent braiding step. In practical applications, the number C of metal wires contained in the braided wire 10 can be 4, 6, 8, or 10 mm, and the specific value can be set according to actual needs.

[0042] In some embodiments, the ratio D of the number of metal wires with different diameters in the same braid wire 10 ranges from 0.5 to 1.5. It can be understood that the same braid wire 10 contains metal wires with at least two diameters and the metal wires have multiple, for example, in the same braid wire 10, the metal wires with a diameter have x, the metal wires with a diameter have y, and the ratio D of the number of metal wires with different diameters in the same braid wire 10 is D = x / y or D = y / x. Through experiments, when the ratio D of the number of metal wires with different diameters in the same braid wire 10 meets the range 0.5≤D≤1.5, the porosity of the prepared wick is relatively large, and when the ratio D is less than 0.5 or greater than 1.5, the porosity of the prepared wick is relatively low. Therefore, the ratio D of the number of metal wires with different diameters in the same braid wire 10 ranges from 0.5 to 1.5, which is beneficial to improve the performance of the heat pipe. In practical applications, the ratio D of the number of metal wires with different diameters in the same braid wire 10 is preferably 1, that is, the number of metal wires with different diameters in the same braid wire 10 is preferably the same. For example, a braid wire 10 contains 6 metal wires, if the diameter of the metal wire has two kinds, the number of each kind of metal wire in the same braid wire 10 is preferably 3, if the diameter of the metal wire has three kinds, the number of each kind of metal wire in the same braid 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 according to actual needs.

[0043] In some embodiments, the number of layers E of the tubular fabric 20 contained in the braid 30 ranges from 3 to 5. It can be understood that when the number of layers E of the tubular fabric 20 contained in the braid 30 is less than 3, the braid 30 prepared is small, and the gaps and holes are also less, and if it is greater than 5, the braid 30 prepared is large, occupying the gas flow space in the heat pipe, affecting the performance of the heat pipe; selecting 3 to 5 layers (including endpoint values) of tubular fabric 20 of the braid 30 is more appropriate, which is beneficial to ensure that the heat pipe has good performance. In practical applications, the number of layers E of the tubular fabric 20 contained in the braid 30 can be 3, 4 or 5, which can be set according to actual needs.

[0044] Specifically, in the braiding step, a braiding machine with a yarn carrier is used to uniformly and alternately arrange metal wire spindles with different parameters on the yarn carrier. This arrangement can ensure the stability of the tubular fabric 20 obtained by spiral interlacing, facilitating braiding.

[0045] In some embodiments, the braided fabric 30 is rolled and cleaned before the sintering step. It can be understood that after the braiding step and before the sintering step, the braided fabric 30 can be rolled by a rolling device to process it into a flat structure, facilitate its placement inside the tube body, reduce the possibility of flexible bending or undulation during the placement process, and facilitate the control of the shape of the shrinkage collapse after sintering; the braided fabric 30 can be cleaned by a cleaning device to remove oil stains or other impurities thereon, facilitating use. In actual application, rolling and cleaning can be selected and performed according to actual use needs, which are not limited here.

[0046] The heat pipe according to the second aspect embodiment of the present application comprises a wick prepared by the preparation process of the porous spiral braided wick according to the first aspect embodiment of the present application.

[0047] The heat pipe according to the embodiments of the present application can improve the porosity of the prepared wick by using the preparation process of the porous spiral braided wick, which is beneficial to improve the performance of the heat pipe.

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

[0049] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge possessed by those skilled in the art without departing from the purpose of the present application.

Claims

1. A process for making a porous spiral-wound mesh wick, characterized by, The method comprises the following steps: coiling, selecting at least two different wire diameters of metal wire materials, and coiling multiple metal wires through a coiling machine according to a required coiling shape to obtain multiple metal wire spindles, wherein the multiple metal wires in the metal wire spindles form braiding wires for braiding, each braiding wire contains at least two different wire diameters of metal wires, and the number ratio D of the metal wires with different wire diameters in the same braiding wire ranges from 0.5 to 1.5; braiding, placing the multiple metal wire spindles in a braiding machine and braiding through the braiding machine to orderly and spirally interweave the multiple braiding wires to form a tubular fabric, and then continuously braiding through the braiding machine on the outside of the tubular fabric to form a braided fabric with multiple layers of tubular fabrics; sintering, placing the braided fabric in the inner cavity of the tube body of a heat pipe and sintering through a heating device to form a liquid absorbing core in the inner cavity of the tube body of the heat pipe.

2. The process for making a porous spiral woven mesh wick according to claim 1, wherein, The braiding wires can be divided into at least two types, and the braiding wires of different types contain metal wires with different wire diameters.

3. The process for making a porous spiral woven mesh wick according to claim 2, wherein, The tubular fabrics of different layers in the braided fabric respectively adopt different types of braiding wires.

4. The process for making a porous spiral woven mesh wick according to claim 1, wherein, The wire diameter size A of the metal wires ranges from 0.03 mm to 0.1 mm.

5. The process for making a porous spiral woven mesh wick according to claim 1, wherein, The difference B between the wire diameters of the metal wires ranges from 0.01 mm to 0.03 mm.

6. The process for making a porous spiral woven mesh wick according to claim 1, wherein, The number C of the metal wires contained in the braiding wires ranges from 4 to 10.

7. The process for making a porous spiral woven mesh wick according to claim 1, wherein, The number E of the layers of the tubular fabrics contained in the braided fabric ranges from 3 to 5.

8. The process for making a porous spiral woven mesh wick according to claim 1, wherein, Before the sintering step, the braided fabric is rolled and cleaned.

9. A heat pipe, characterized by The liquid absorbing core is prepared by the preparation process of the porous spiral braided mesh liquid absorbing core according to any one of claims 1 to 8.

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