TWM643911U - Capillary woven mesh structure - Google Patents

Abstract

A capillary weaving network structure, comprising a plurality of braiding wires, using a single braiding wire to match a wire group, the wire group is composed of a plurality of braiding wires, each of which is woven into a network structure in a first weaving direction and a second weaving direction in a repeated and overlapping (staggered) manner, and is used in a two-phase flow heat dissipation unit, thereby greatly improving capillary force and water accumulation (including) characteristics, thereby improving heat transfer efficiency.

Description

capillary weave mesh structure

This creation relates to a capillary structure, especially a capillary weaving network structure with better capillary force and water-accumulating (containing) properties to improve capillary heat transfer performance.

With the rapid advancement of the technology industry, many 3C electronic products today are designed to be light, thin, short, and small. Therefore, the heat dissipation unit used as the internal heat dissipation or heat conduction also needs to be relatively thin. Therefore, devices that use the principle of two-phase flow changes, such as heat pipe vapor chambers, are therefore valued. However, the heat transfer performance of these two-phase flow devices is mainly determined by the capillary structure.

Referring to Fig. 5, it is Taiwan Patent No. 201525398A publication, which provides a flat thinned braided mesh capillary structure of an ultra-thin heat pipe and its ultrathin heat pipe structure. Wherein, each warp and weft thread has a plurality of intersecting junction sections 53 and a plurality of connection sections 54 connected in series between any two adjacent junction sections, and the cross-sectional shape of each warp and weft thread junction section 53 is a flat shape, so as to obtain a thinned flat and thinned woven net capillary structure.

However, the capillary structure of the above-mentioned conventional weaving pattern is simply formed by repeated interlacing of single warp and weft threads 51, 52, and the wire diameters (thickness, diameter) are all the same, and the interlaced weaving in the warp and weft directions is performed. The size of the pores formed is fixed, and the number of pores and meshes is fixed and limited, so that the application of capillary force (such as increasing the water content (accumulation) in the capillary structure area or locally, and lateral water absorption characteristics) is too single. Therefore, the conventional woven mesh capillary structure only provides the same size and a limited number of pores and meshes to absorb the working fluid, which is not enough to provide the flexible application of the two-phase flow device and the requirements for any matching according to the characteristic requirements, so that the water holding capacity is insufficient and the overall capillary force is poor, which leads to insufficient water content at the evaporation surface of the vapor chamber or excessive return water, resulting in dry-out and reduced heat transfer efficiency.

Therefore, how to solve the problems and deficiencies of the capillary structure in the above-mentioned heat dissipation unit is the direction that the author of this case and related companies engaged in this industry want to study and improve.

One purpose of this creation is to provide a thread group composed of a single braided thread and a group of plural braided threads. The two are sequentially woven into a capillary braided network structure in a repeated and overlapping manner. The diameters of the braided threads in the thread group can be selected to be partially the same, partially different, or all the same or all different, so that the capillary braided network structure has pores of the same or different sizes and effectively increases the number of pores. Heat transfer performer.

In order to achieve the above purpose, the present invention provides a capillary woven mesh structure, which is applied in a two-phase flow cooling unit to provide capillary action. The capillary weaving network structure includes a plurality of knitting lines, and a single knitting line is used to match a line group (composed of a plurality of knitting lines). The single knitting line and the line group are respectively woven in a first knitting direction and a second knitting direction or a second knitting direction and a first knitting direction to form the capillary knitting network structure in a repeated and overlapping (staggered) manner; the wire diameters of the knitting lines can be partially the same, partially different, all the same or all different.

Accordingly, the capillary weaving network structure of the present invention uses a single weaving thread to match a line group (combined by a plurality of braiding threads with the same or different thicknesses, and different numbers). The combination of the two overlapping (staggered) weaving in sequence can be applied to the entire weaving area (area) or partial weaving area (area) of the capillary weaving network structure, so that the capillary weaving network structure has pores of the same or different sizes and effectively increases the number of holes. The number of pores can be increased to form a dense and strong network structure, which can greatly improve the capillary force and the characteristics of water accumulation (containment), which can effectively guide the working fluid in a directional, rapid diversion (return flow), comprehensive diffusion, and water accumulation (containment) on the evaporation surface of the two-phase flow heat dissipation unit, so as to effectively prevent dry burning of the evaporation surface and improve heat exchange efficiency.

100: two-phase flow cooling unit

101: upper board

102: lower board

110: chamber

111: evaporation surface

112: condensation surface

200: capillary weave mesh structure

20: Warp

301: diversion microchannel

30, 30': Weft (first and second weft)

3: Weft thread group (thread group)

4: Mesh

61:Heat source contact area

62: Surrounding area

t1, t1': porosity

P1: warp wire diameter

P2: The diameter of the first weft (weft diameter)

P3: Second weft thread diameter

Y: the first weaving direction

X: Second weaving direction

A: Staggered parts

Figure 1 is a three-dimensional exploded schematic diagram of this creation applied to a two-phase flow cooling unit; Figure 2A is a top view schematic diagram of the capillary weaving network structure of this creation; Figure 2B is a top view schematic diagram of another alternative embodiment of this creation; Figure 2C is a top view schematic diagram of another variation embodiment of this creation; The top view schematic diagram of the structure; the 3A figure is the side view schematic diagram of the 2A figure of this creation from the left; the 3B figure is the side view schematic diagram of the 2B figure of this creation from the left;

The above-mentioned purpose of this creation and its structural and functional characteristics will be described according to the embodiments of the attached drawings, but the attached drawings are only for reference and illustration, and are not used to limit this creation.

Please refer to Figures 1, 2A, 2B, 2C, 2D, 2E, 2F, 2G, 3A, 3B and Figure 4. As shown in the figure, this invention is a kind of capillary woven mesh structure 200 which is arranged in a heat dissipation unit using two-phase flow (it can be a two-phase flow heat dissipation unit 100, such as a vapor chamber, a flat heat pipe, a heat pipe, a loop heat pipe, or a two-phase flow device). As shown in Figures 1 and 4, the two-phase flow cooling unit 100 has a housing, In this case, the vapor chamber is chosen for illustration, and the housing includes an upper plate 101 covering the lower plate 102 and jointly defining a chamber 110 filled with a working liquid (as shown in FIG. 4 ). The capillary weaving mesh structure 200 can be at least selectively arranged on at least one inner surface of the upper plate 101 and/or the lower plate 102.

The capillary braided mesh structure 200 is composed of a plurality of braided wires that are woven in two different directions (such as a first weaving direction and a second weaving direction) in a staggered and sequentially overlapping manner. In the following embodiments of the present invention, a single braided thread is combined with a thread group (which is composed of multiple braided threads with the same or different thicknesses and different numbers), so that the single braided thread and the thread group are woven in a repeated and overlapping (staggered) manner to form the capillary braided network structure 200 . In this embodiment, a single weaving thread is selected as the warp thread 20, and the thread group 3 is selected as a plurality of weft threads 30 for the following description, but not limited thereto. In the 2A, 2B, 2C, and 2D embodiments, select at least two first and second parallel threads 30, 30' as a group of parallel thread groups (thread groups) 3 (the quantity of this group can also be selected from two or more, three, four or other quantities). A second weaving direction X (for example, transverse direction) and a single warp thread 20 along a first weaving direction Y (for example, longitudinal direction) are interlaced in different directions and sequentially and overlapped to form the capillary mesh weaving structure 200 .

In addition, under the same weaving area, the two weft threads (first and second weft threads) 30, 30′ in each set of weft thread groups 3 have first and second weft thread diameters P2 and P3 of different thicknesses, the first weft thread diameter P2 is greater than the second weft thread diameter P3, both of which are smaller than the warp thread diameter P1 of a single warp thread 20, and the warp thread diameter P1 of a single warp thread 20 is greater than or equal to the first and second weft thread diameters P2, P2, and P3 of each weft thread group 3. Under the setting of the sum of P3, the number of the first and second weft threads 30, 30' of different thicknesses is increased to construct the capillary weaving network structure 200 with more hole (gap) gaps t1, t1' of different sizes. Specifically, continue to refer to the 2A, 2B, 3A, 3B shown in Figures, each warp 20 and at least two first and second wefts 30, 30' of the same or different thickness in each group of weft groups 3 are sequentially woven with repeated and overlapping (staggered) to form a plurality of interlaced parts A, and in each interlaced part A, the warp 20 is respectively with each of the same or different thicknesses. Two holes (spaces) t1, t1' of the same or different sizes are formed between the outer sides of the first and second wefts 30, 30' respectively, so that the number of holes (spaces) t1, t1' (as shown in Figures 3A and 3B) and the number of holes (spaces) of the same or different sizes can be increased. In addition, two adjacent warp threads 20, 20 and the first and second weft threads 30, 30' of the adjacent weft thread group 3 are jointly surrounded by a mesh (mesh hole) 4.

In addition, the single meridian 20 of this invention has a meridian diameter P1, and its cross-sectional shape can be a circular cross-section or a non-circular cross-section (such as an elliptical cross-section or a flat cross-section or a honeycomb-shaped cross-section or any geometric cross-section); And a plurality of wefts 30,30' in this weft group 3 have the first and second weft diameters P2, P3 of different thicknesses, and their cross-sectional shapes can be identical or non-identical (as the 3A figure is a large circular and small circular cross-section from the side view viewed from the left direction in Fig. 2A; or two non-circular cross-sections or arbitrary geometric cross-sections), and at least two guide microchannels 301 are formed between the first weft 30 and the second weft 30' assembled in the weft group 3 They are respectively located above and below the contact points of the first and second wefts 30, 30' (as shown in Fig. 3A), and extend along the length direction of the first and second wefts 30, 30'. Also as shown in Figures 2B and 3B, the two weft threads 30 assembled in the weft thread group 3 have the same weft thread diameter P2, and their cross-sectional shapes can be two slightly identical circular sections (or two non-circular sections or arbitrary geometric sections).

In addition in the 2C, 2D figure embodiments, a single warp thread 20 can be matched with four parallel threads 30, 30', 30, 30' of the same or different thickness as a group of parallel thread groups 3; as in the embodiment of the 2E figure, every three warp threads 20 of the same or different wire diameters are selected to be matched with a group of five identical or different thread diameters of the parallel threads 30 as a group of parallel thread groups 3. The capillary weaving network structure 200 is woven in a repeated and overlapping manner using the combination of the warp and weft in different ratios and wire diameters.

As mentioned above, in this creative embodiment, a single weaving thread can also be selected as a weft thread, and the thread group can be selected as a plurality of warp threads.

The aforementioned braided wires can be made of metals and non-metals (such as plastics and stones) with certain toughness and good thermal conductivity. That is, the aforementioned warp thread 20 and weft thread 30 (30') use the same material (or use different materials) for collocation application.

Continue to refer to Figures 1 and 4 and cooperate with Figures 2A, 2B, 2C, 2D, 2E, 3A, and 3B. The outer side of the lower plate 102 of the aforementioned two-phase flow cooling unit 100 is attached to a heat source (such as a central processing unit or a graphics processing unit; not shown in the figure), and an evaporation surface 111 is formed on the inner side thereof, and a condensation surface 112 is formed on the inner side of the upper plate 101 to face the evaporation surface 111. In this invention, the capillary woven network structure 200 can be selected on at least one side of the evaporating surface 111 or the condensing surface 112 . When the aforementioned two-phase flow cooling unit 100 is in operation, the lower plate 102 absorbs the heat from the heat source, and the heat is transferred to the evaporation surface 111, so that the liquid working fluid on the evaporation surface 111 can quickly evaporate into a gaseous working fluid and quickly flow to the condensation surface 112. Then the gaseous working fluid is condensed into a liquid working fluid after heat exchange between the condensed surface 112 and the external air. Then the liquid working fluid on the condensation surface 112 can return to the inner side of the lower plate 102 through gravity or other capillary structures. Through the combination of a single warp 20 and a plurality of wefts 30 (30'), the capillary weaving network structure 200 can have more pores (spaces) t1, t1' of the same or different sizes and increase hole (spaces) gaps under the application of the warp 20 and the wefts 30 (30') in different composition ratios and wire diameters. The number and multi-guiding micro-channels 301 are used to increase the return flow rate of the working fluid to the evaporation surface 111, and the directional guide flow can be quickly diffused and distributed on the evaporation surface 111, and has better water accumulation (containing) characteristics in the area of the evaporation surface 111, preventing the possibility of dry burning. In this way, it is helpful for the boiling evaporation of the working fluid on the evaporation surface 111 and the response speed to the temperature, as well as the rapid and continuous return of the condensed working fluid on the condensation surface 112 to the evaporation surface 111 to avoid dry burning, and the next cycle of endothermic evaporation and exothermic condensation can be carried out quickly, so that the cycle of continuous liquid and vapor phase changes can be achieved through repeated actions to continuously transfer heat. Cooling performance. In this way, the two-phase flow cooling unit 100 achieves good temperature uniformity and heat dissipation.

In actual implementation, the capillary weaving network structure 200 can use a single knitting thread (such as the warp thread 20) to weave a group of thread groups (such as the weft thread group 3) in the entire weaving area (area) or a partial weaving area (area). The hole (gap) t1, t1' formed by the combination can also be adjusted according to any or all of the requirements of increasing (containing) water and capillary action, adjusting the respective wire diameters of the warp 20 and the first and second weft 30, 30' in the weft group 3 of the capillary woven network structure 200 in this creation to adjust the size of these holes (gap), or adjusting the distance between the warp 20 and the warp 20 and/or the first weft 30 and the second weft 30 ', Furthermore, adjusting the density between the warp 20 and the weft 30 (30') can more effectively meet the heat dissipation requirements required by various parts of different types of two-phase flow cooling units 100 (such as vapor chambers or heat pipes).

Furthermore, the capillary woven network structure 200 located at the input of the heat source (i.e., the evaporation surface 111) can be arranged in any one of a single block, a plurality of blocks, or the entire block depending on the distribution of the high temperature area of the heat source on the evaporation surface 111.

As mentioned above, all the weaving regions (areas) of the capillary weaving network structure 200 in this embodiment can use a single weaving thread (such as the warp thread 20) with a thread group (such as the weft thread group 3; a plurality of weft threads 30, 30' of the same or different thickness) weaving method or pattern. But not limited thereto, in another embodiment, referring to Figures 2F and 2G, the capillary weaving network structure 200 can be woven with a single warp thread and a single weft thread in the general tradition, and only in the local weaving area of the capillary weaving network structure 200, the weaving method of using a single weaving thread (such as a warp thread 20) to match a group of thread groups (such as a weft thread group 3; composed of a plurality of weft threads 30, 30' of the same or different thickness) can be used in the weaving mode of the present invention, and the rest of the parts still adopt the general or different thickness weaving method. Traditional weaving method. For example, the capillary woven network structure 200 has a heat source contact area 61 corresponding to a heat source at the center and a peripheral area 62 around the heat source contact area 61. The heat source contact area 61 can be woven in a repeating and overlapping (staggered) manner in a traditional single warp with a single weft. It surrounds the periphery of the heat source contact area 61 . Specifically, the heat source contact area 61 of the capillary woven network structure 200 is set in the chamber 110 of the two-phase flow heat dissipation unit 100 and corresponds to the evaporation surface 111 in contact with the heat source, so that the working fluid adsorbed by the heat source contact area 61 of the capillary woven network structure 200 can be quickly evaporated after being heated, and at the same time through the capillary woven network structure 200 The surrounding area 62 has better capillary force and poly (containing) water characteristics, which can accelerate the reflux of the condensed working fluid, and the poly (containing) water is at the periphery of the heat source contact area 61, and then provide the working fluid to the heat source contact area 61 in a timely manner to prevent the evaporation surface 111 from dry burning.

Of course, the capillary braided mesh structure 200 of the present invention, in which a single braided wire is matched with a group of wire groups, can also be used in either the heat source contact area 61 or the peripheral area 62 as required.

The above has described this creation in detail, but the above is only one of the preferred embodiments of this creation, and should not limit the scope of this creation. That is, all equal changes and modifications made according to the application scope of this creation should still be covered by the patent of this creation.

00: capillary weave mesh structure 2

20: Warp

3: Weft thread group (thread group)

30, 30': Weft (first and second weft)

P1: warp wire diameter

P2: The diameter of the first weft (weft diameter)

P3: Second weft thread diameter

4: Mesh

301: diversion microchannel

Y: the first weaving direction

X: Second weaving direction

A: Staggered parts

Claims (12)

A capillary braided network structure is used in a two-phase flow heat dissipation unit; it consists of a plurality of braided wires; the capillary braided mesh structure uses a single braided wire to match a wire group, and the wire group is composed of a plurality of braided wires, each of which is respectively woven in a first weaving direction and a second weaving direction in a repeated and overlapping manner, thereby greatly improving capillary force and water collection characteristics. The capillary braided network structure as described in claim 1, wherein the wire diameters of the braided wires in the wire group can be partially the same or partially different. The capillary braided network structure according to claim 1, wherein the cross-sectional shape of at least one braided wire in the wire group is at least one circular cross-section. The capillary braided network structure according to claim 1, wherein the cross-sectional shape of the single braided wire is a circular cross-section or a non-circular cross-section. The capillary braided network structure as described in claim 1, wherein the braided wires in the wire group are all of different wire diameters. The capillary braided network structure according to claim 1, wherein the diameter of the single braided wire is greater than or equal to the sum of the wire diameters of the wire groups. The capillary braided network structure according to claim 1, wherein the material of the single braided wire and the braided wires of the wire group is at least one of metal or non-metal. The capillary weaving mesh structure as described in Claim 1 is set in the two-phase flow heat dissipation unit, the two-phase flow heat dissipation unit includes an upper plate and a lower plate, and the upper plate covers the lower plate to jointly define a A chamber filled with a working liquid, the capillary weaving network structure is arranged on the inner side of any one or more of the upper plate and the lower plate of the chamber. The capillary woven network structure as described in claim 1, wherein the two-phase flow cooling unit is one of vapor chamber, flat heat pipe, heat pipe, loop heat pipe or two-phase flow device. A capillary braided network structure used in a two-phase flow heat dissipation unit; it includes a single braided wire and another single braided wire in different directions to be woven in a repeated and overlapping manner to form the capillary braided network structure. It is characterized in that: a single braided wire is used to match a wire group in a local weaving area of the capillary braided network structure. Improves capillary force and water-accumulating properties. The capillary braided network structure according to claim 10, wherein the wire diameters of the braided wires in the wire group can be partially the same, partially different, or completely different. According to claim 10, the capillary woven network structure has a heat source contact area corresponding to a heat source and a peripheral area surrounding the heat source contact area, and the peripheral area is the partial weaving area.

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