TWM645348U - Capillary mesh weaving structure - Google Patents

Abstract

A capillary mesh braided structure used in a two-phase flow heat dissipation unit. It consists of a plurality of warp threads and weft threads. A single warp thread is used to match a weft thread group composed of at least two weft threads with different diameters and thicknesses. The two are arranged according to the The capillary mesh woven structure is woven in a repeated and overlapping (staggered) manner, thereby increasing the pores of different sizes and the number of pores, so that it can have better capillary force and water-gathering (containing) properties, thereby greatly Improve heat transfer efficiency.

Description

Capillary mesh weave structure

This invention relates to a capillary structure, especially a capillary mesh weaving structure that improves better capillary force and water-polymerizing (containing) properties, thereby improving capillary heat transfer efficiency.

With the rapid progress of the technology industry, many 3C electronic products are now designed to be light, thin, short, and small. Therefore, the heat dissipation unit used for internal heat dissipation or heat conduction also needs to be relatively thin. Therefore, two-phase flow is used to Devices with changing principles such as heat pipe vapor chambers have therefore received attention. However, the heat transfer performance of these two-phase flow devices largely depends on the capillary structure.

Refer to Figure 5, which is Taiwan Patent Publication No. 201525398A, which provides a flat thin braided mesh capillary structure of an ultra-thin heat pipe and its ultra-thin heat pipe structure. It mainly reveals that the flat thinned braided mesh capillary structure 5 includes multiple The first knitting threads 51 in the warp direction and the second knitting threads 52 in the weft direction are repeated and interlaced with each other, and the two adjacent first knitting threads 51 and the two adjacent second knitting threads 52 are common. There is a mesh around it. Each braided wire has a plurality of spaced-apart junction sections 53 and a plurality of connecting sections 54 respectively connected in series between any two adjacent junction sections 53, and the cross-sectional shape of the junction section 53 of each braided wire is a Flat shape, whereby a thinned flat woven mesh capillary structure can be obtained.

However, the capillary structure of the aforementioned conventional braiding type is simply braided with a single first and second braided wire 51, 52 in a repeated and staggered manner, and the wire diameters (thickness, diameter) are all the same. , the warp and weft directions are intertwined (staggered) weaving, the size of the pores formed are fixed, and the number of pores and meshes is also fixed, so that when the capillary force is used (such as the increase in the capillary structure area or local area) (Water accumulation, transverse water absorption characteristics) are too single (adjustment) and lack of flexible use;

Therefore, the capillary structure of the conventional braided mesh only provides the same size and a limited number of pores and meshes for adsorbing the working fluid. It is not enough to provide the two-phase flow device with versatile and flexible applications and can be arbitrarily matched according to the characteristic requirements, so that the water-holding capacity Insufficient overall capillary force is poor, which in turn causes insufficient water content at the evaporation surface of the vapor chamber or water backflow across the surface, leading to problems such as dry-out and reduced heat transfer efficiency.

Therefore, how to solve the above-mentioned problems and deficiencies in the capillary structure of the braided mesh in the heat dissipation unit is the direction for improvement that the creators of this project and relevant industry players in this industry are eager to research and improve.

One purpose of this creation is to provide a capillary mesh weaving method by combining a single warp thread with a weft thread group (composed of a plurality of weft threads with different thicknesses and quantities) and sequentially and repeatedly overlapping (staggered) them. Structure, through the combination of different quantity ratios and different wire diameters, increases the pores of different sizes and the number of pores, so that the capillary mesh weaving structure of this invention has better capillary force and water-gathering (containing) properties. Greatly improve heat transfer efficiency.

In order to achieve the above purpose, this invention provides a capillary mesh weaving structure, which is used in a two-phase flow heat dissipation unit to provide capillary action. The capillary mesh weaving structure includes a plurality of warps and wefts, in which a single warp is matched with a The weft thread groups (composed of at least two or more weft threads of different diameters) are woven in a first weaving direction and a second weaving direction in a repeated and overlapping (staggered) manner to form the capillary mesh weaving structure.

Accordingly, the capillary mesh woven structure of this invention uses a single warp thread and a weft thread group (composed of multiple weft threads with different thicknesses and quantities) to repeat and overlap each other, and can be applied to all capillary mesh woven structures. The braided area (area) or the local braided area (area) allows the capillary mesh braided structure to increase its pores of different sizes and quantity, forming a dense and strong mesh structure, thereby having better capillary force and poly( Contains) water characteristics and capillary action, which can effectively guide the working fluid in a directional and rapid direction (return). flow), comprehensive diffusion and accumulation (containing) water on the evaporation surface of the two-phase flow heat dissipation unit to effectively prevent dry burning of the evaporation surface and improve heat exchange efficiency.

100: Two-phase flow cooling unit

101:On the board

102: Lower board

110: Chamber

111: Evaporation surface

112:Condensation surface

200: Capillary mesh weave structure

20:Longitude

30, 30’ (first latitude 30, second latitude 30’): latitude

3:Weft line group

301: Diversion microchannel

4: Mesh

61: Heat source contact area

62: Surrounding area

t1, t1’: pores

P1: warp diameter

P2: first latitude line diameter

P3: Second latitude line diameter

Y: first weaving direction

X: Second weaving direction

A:Interlaced parts

Figure 1 is a three-dimensional exploded schematic diagram of the present invention applied to a two-phase flow heat dissipation unit; Figure 2A is a top view of the capillary mesh braided structure of the present invention; Figure 2B is a top view of the braided mesh structure of another embodiment of the present invention; Figures 2C and 2D are schematic top views of the woven mesh structure of an alternative embodiment of this invention; Figure 3 is a schematic side view of Figure 2A of this invention seen from the left; Figure 4 is a schematic diagram of the capillary mesh woven structure of this invention. A schematic cross-sectional view of a two-phase flow heat dissipation unit; Figure 5 is a schematic side view of the capillary structure of a conventional flat thin braided mesh.

The above-mentioned purpose of this invention and its structural and functional characteristics will be explained based on the embodiments of the attached drawings. However, the attached drawings are only for reference and illustration and are not used to limit this invention.

Please refer to Figures 1, 2A, 2B, 3 and 4. As shown in the figure, the present invention is a capillary mesh braided structure 200 which is arranged in a two-phase flow heat dissipation unit (it can be a two-phase flow heat dissipation unit 100, such as a vapor chamber, flat plate heat pipe, heat pipe, loop heat pipe or application Both can be used on two-phase flow devices). As shown in Figures 1 and 4, the two-phase flow heat dissipation unit 100 has a shell. In this case, a vapor chamber is chosen for illustration. The shell includes an upper plate 101 covering a lower plate 102 and jointly defining a space filled with a In the chamber 110 of the working fluid (as shown in FIG. 4 ), the capillary mesh structure 200 can be at least selectively disposed on any inner surface of the upper plate 101 and/or the lower plate 102 .

The capillary mesh structure 200 includes a plurality of warp threads 20 and weft threads 30 . In the embodiments of Figures 2A, 2B, and 3, at least two first and second weft lines 30, 30' are chosen to be a group of weft lines 3 (this group The number of the weft threads 30 and 30' in the weft thread group 3 can also be selected to be more than two, three, four or other application combinations. The weft threads 30 and 30' in the weft thread group 3 are wires of different diameters (thickness) and are arranged closely together, so that many Each weft thread group 3 of the group has a single warp thread 20 along a second weaving direction The capillary mesh structure 200 is woven into the capillary mesh structure 200 .

In addition, under the same weaving area, the two first and second weft threads 30 and 30' in each weft thread group 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 latitude 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 latitude threads of each latitude thread group 3. Under the setting of the sum of the two parallel diameters P2 and P3, the number of first and second parallels 30 and 30' of different thicknesses is increased, thereby constructing holes (inter) gaps t1, t1' and number of holes with different sizes. The capillary mesh weave structure 200. Specifically, continuing to refer to Figures 2A and 3, each warp 20 and at least two first and second wefts 30 and 30' of different thicknesses in each group of weft groups 3 are repeated and overlapped (interlaced) in sequence. The weaving is formed with a plurality of interlaced parts A, and in each interlaced part A, two holes of different sizes are formed between the warp 20 and the outer sides of each of the two first and second wefts 30 and 30' of different thicknesses ( With the gap t1 and t1' set in this way, the gap t1 and t1' of different sizes can be obtained (as shown in Figure 3) and the number of gaps can be increased. In addition, the 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) 4.

In addition, the single warp 20 of this invention has a warp 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, a flat cross-section, a honeycomb cross-section or any geometric cross-section) and the plurality of wefts 30 and 30' in the weft thread group 3 have first and second weft thread diameters P2 and P3 of different thicknesses, and their cross-sectional shapes may be the same or different (as shown in Figure 3 The side view from the left direction in 2A shows a large circular cross-section, a small circular cross-section; or two non-circular cross-sections or any geometric cross-section), and the first weft line 30 and the second weft line 30 assembled in the weft line group 3 There are at least two diversion micro-channels 301 formed between They are respectively located above and below the contact point of the first and second weft lines 30 and 30' (as shown in Figure 3), and extend along the length direction of the first and second weft lines 30 and 30'.

The material of the aforementioned warp threads 20 and weft threads 30 and 30' can be metal with certain toughness and good thermal conductivity, or non-metal (such as plastic, stone). That is to say, the aforementioned warp threads 20 and the weft threads 30 and 30' are made of the same material (or different materials) for matching application.

Continue to refer to Figures 1 and 4 and match Figures 2A, 2B, and 3. The outer side of the lower plate 102 of the aforementioned two-phase flow heat dissipation unit 100 is in contact with a heat source (such as a central processing unit or a graphics processor or other electronic unit; not shown in the figure), and an evaporation surface 111 is formed on the inner side thereof. The inner side of the upper plate 101 forms a condensation surface 112 facing the evaporation surface 111 . The capillary mesh woven structure 200 of the present invention can be disposed on either the evaporation surface 111 or the condensation surface 112. In the embodiment of the present invention, the capillary mesh woven structure 200 is selectively disposed on the evaporation surface 111 on the surface of the lower plate 102. When the two-phase flow heat dissipation unit 100 is working, the lower plate 102 absorbs heat from the self-heating source and transfers the heat to the evaporation surface 111, so that the liquid working fluid located 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 liquid working fluid again due to the heat exchange between the condensation surface 112 and the external air. Then the liquid working fluid on the condensation surface 112 can return to the inside of the lower plate 102 through gravity or capillary structure. With this invention, the warp 20 and the weft 30 (30') are combined with a single warp 20 and a plurality of wefts 30 (30'). 30') Due to the different composition ratios and wire diameters of the two, the capillary mesh woven structure 200 can have more holes (inter) gaps t1 and t1' of different sizes and increase the number and number of holes (intervals). The flow guide micro-channel 301 is used to increase the return flow speed of the working fluid to the evaporation surface 111, and has a directional guide flow to quickly spread and distribute on the evaporation surface 111, and has a better effect in the evaporation surface 111 area. The property of poly(containing) water prevents the possibility of dry burning. In this way, it is helpful for the boiling and evaporation of the working fluid on the evaporation surface 111 and the response speed to temperature, and the rapid and continuous flow back of the condensed working fluid on the condensation surface 112 to the evaporation surface 111 to avoid dry burning, and can quickly proceed to the next time. The cycle of endothermic evaporation and exothermic condensation can achieve a cycle of continuous liquid and vapor phase changes to continuously transfer heat and effectively accelerate the cavity. The liquid and vapor phase change circulation speed of the working fluid in the chamber 110 effectively improves the heat transfer effect in the high-temperature area of the heat source, thereby improving the heat dissipation efficiency. In this way, the two-phase flow heat dissipation unit 100 can achieve good temperature uniformity and heat dissipation.

During specific implementation, the capillary mesh weaving structure 200 can utilize the holes (gaps) formed by the weaving combination of a single warp 20 and a set of weft threads 3 in the entire knitting area (area) or a partial weaving area (area). t1, t1', you can also adjust the warp 20 and the first and second weft 30 in the weft group 3 of the capillary mesh weaving structure 200 of the present invention according to any or all of the requirements for improving water concentration and capillary action. , 30' of respective wire diameters to adjust the size of these holes (gaps), or adjust the distance between the warp 20 and the warp 20 and/or the first weft 30 and the second weft 30', Then, the density between the warp 20 and the weft 30 (30') is adjusted to more effectively respond to the heat dissipation requirements required by various parts of different types of two-phase flow heat dissipation units 100 (such as vapor chambers or heat pipes).

Furthermore, the capillary mesh structure 200 located at the input point of the heat source (i.e., the evaporation surface 111) is arranged in a single block or a plurality of blocks depending on the distribution pattern of the high-temperature zone of the heat source on the evaporation surface 111. Distribute either set or distributed throughout the block.

As mentioned above, the entire knitting area (area) of the capillary mesh knitting structure 200 in this embodiment can adopt a knitting method or pattern in which a single warp 20 is matched with a weft thread group 3 (a plurality of weft threads 30, 30' of different thicknesses). But it is not limited to this. In an alternative embodiment, refer to Figures 2C and 2D, the capillary mesh woven structure 200 can be woven with a single warp thread and a single weft thread in the general tradition. Only in the capillary mesh woven structure The local weaving area of 200 adopts the weaving method of this creation, which uses a single warp 20 and a set of wefts 3 (composed of a plurality of wefts 30 and 30' of different thicknesses), while the other parts still adopt the general or traditional weaving method. For example, the capillary mesh structure 200 has a heat source contact area 61 in the center corresponding to a heat source and a peripheral area 62 around the heat source contact area 61. The heat source contact area 61 can be a traditional single warp with a single weft. It is woven in a repeated and overlapping (staggered) manner in sequence, and the peripheral area 62 uses a single warp 20 of this invention to match a set of weft threads 3 of the same or different thicknesses in sequence. It is braided in a repeated and overlapping (staggered) manner, so that the braiding surrounds the periphery of the heat source contact area 61 . Specifically, the heat source contact area 61 of the capillary mesh structure 200 is located in the chamber 110 of the two-phase flow heat dissipation unit 100 and corresponds to the evaporation surface 111 of the heat source, so that the heat source of the capillary mesh structure 200 contacts The working fluid adsorbed by the zone 61 can be quickly evaporated after being heated. At the same time, the peripheral zone 62 of the capillary mesh structure 200 has better capillary force and poly (containing) water characteristics, which can accelerate the return of the condensed working fluid, and The water is collected around the heat source contact area 61 to provide 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 mesh weaving structure 200 of this invention using a single warp thread 20 and a set of weft thread sets 3 can also be used in either the heat source contact area 61 or the peripheral area 62 as required.

The invention has been described in detail above. However, the above description is only one of the preferred embodiments of the invention and cannot limit the scope of implementation of the invention. That is to say, all equal changes and modifications made based on the application scope of this creation should still be covered by the patent of this creation.

200: Capillary mesh weave structure

20:Longitude

3:Weft line group

30, 30’ (first latitude 30, second latitude 30’): latitude

P1: warp diameter

P3: first latitude line diameter: P2 second latitude line diameter

4: Mesh

301: Diversion microchannel

Y: first weaving direction

X: Second weaving direction

A:Interlaced parts

Claims (10)

A capillary mesh braided structure is used in a two-phase flow heat dissipation unit; it includes: a warp; a weft thread group, which is composed of at least two weft threads of different diameters; the capillary mesh braided structure utilizes a single warp The threads are combined with a weft thread group and are woven in a repeated and overlapping manner in a first weaving direction and a second weaving direction. This can effectively increase the pores of different sizes and the number of pores in the capillary mesh weaving structure. It can greatly improve capillary force and water gathering properties. The capillary mesh weaving structure as claimed in claim 1, wherein each weft thread in the weft thread group has different thread diameters. The capillary mesh weaving structure as claimed in claim 1, wherein the wire diameter of the single warp thread is greater than or equal to the sum of the wire diameters of the weft thread group. The capillary mesh weaving structure as claimed in claim 1, wherein the cross-sectional shape of at least one weft thread in the weft thread group is at least one circular cross-section. The capillary mesh weaving structure as claimed in claim 1, wherein the cross-sectional shape of at least one warp is a circular cross-section or a non-circular cross-section. The capillary mesh weaving structure as described in claim 1, wherein the material of the warp threads and the weft threads can be at least one of metal or non-metal. The capillary mesh braided structure described in claim 1 is provided in the two-phase flow heat dissipation unit. The two-phase flow heat dissipation unit includes an upper plate and a lower plate. The upper plate covers the lower plate and jointly defines a filling There is a chamber for working fluid, and the capillary mesh structure is arranged inside any one or more of the upper plate and the lower plate of the chamber. The capillary mesh braided structure of claim 1, wherein the two-phase flow heat dissipation unit is a vapor chamber, a flat plate heat pipe, a heat pipe, a loop heat pipe, or a two-phase flow device. A capillary mesh braided structure used in a two-phase flow heat dissipation unit; it includes a single warp thread and a single weft thread woven in two staggered directions in a sequential and repeated overlapping manner to form the capillary mesh braided structure, which is characterized by: The local braiding area of the capillary mesh structure is composed of a single warp thread and a weft thread group composed of at least two weft threads of different diameters. The warp thread and the weft thread group are respectively arranged in a first weaving direction and A second weaving direction is woven in a repeated and overlapping manner, thereby effectively increasing the local weaving area of the capillary mesh woven structure with pores of different sizes and the number of pores, which can greatly improve the capillary force and water gathering properties. The capillary mesh braided structure of claim 9 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 local braided area.

Images