CN116669376A - Woven net structure with capillary action - Google Patents

Abstract

The invention provides a woven mesh structure with capillary action, which is applied to a two-phase flow heat dissipation unit and comprises a plurality of warps and wefts, wherein a single warp is matched with a weft group (consisting of at least two wefts with the same diameter) to be woven into the woven mesh structure in a repeated and overlapping (staggered) mode, so that the pore number of the woven mesh structure is increased, and the woven mesh structure can have better capillary force and poly (water) characteristic, thereby greatly improving the heat transfer efficiency.

Description

Woven net structure with capillary action

Technical Field

The present invention relates to a capillary structure, and more particularly, to a woven mesh structure with capillary function for improving capillary heat transfer efficiency by improving better capillary force and poly (water-containing) characteristics.

Background

With rapid progress in the scientific industry, 3C electronic products are now being designed to be light, thin, short and small, so that a heat dissipation unit for dissipating heat or conducting heat therein needs to be relatively thin, and devices utilizing two-phase flow change principle, such as a heat pipe temperature equalizing plate, are paid attention to. However, the heat conductivity of these two-phase flow devices is largely determined by capillary structure.

Referring to fig. 6, taiwan patent No. 201525398A discloses a flat and thin knitted net capillary structure of an ultrathin heat pipe and an ultrathin heat pipe structure thereof, and mainly discloses that the flat and thin knitted net capillary structure 5 comprises a plurality of first knitted wires 51 in a warp direction and a plurality of second knitted wires 52 in a weft direction which are repeatedly and alternately knitted with each other, and two adjacent first knitted wires 51 and two adjacent second knitted wires 52 are surrounded by a mesh. Each knitting wire is provided with a plurality of connecting sections 53 with intervals and a plurality of connecting sections 54 respectively connected in series between any two adjacent connecting sections 53, and the cross section shape of each connecting section 53 of each knitting wire is flat, so that a thinned flat thinned knitting net capillary structure can be obtained.

However, the capillary structure of the conventional knitting type is formed by repeatedly and alternately knitting only the first and second knitting yarns 51, 52, and the diameters (thickness, diameter) thereof are the same, and the mutual cross knitting (staggered) in the warp and weft directions is performed, so that the pore size is fixed, the number of pores and meshes is limited, and the capillary structure is too limited to be flexibly used in the application of capillary force (such as the capillary structure area or local increase of water (poly) content and transverse water absorption property) beyond the single (tone) limitation;

therefore, the existing woven mesh capillary structure only provides the pores and meshes with the same size and limited quantity to adsorb the working fluid, which is insufficient to provide flexible application of the two-phase flow device and the requirement of random collocation according to the characteristic requirement, so that the water content of the vapor phase plate at the evaporation surface is insufficient due to the poor overall capillary force, and the problems of dry burning (dry-out) and reduced heat transfer efficiency are caused due to the insufficient water content of the vapor phase plate or the excessive water return at the evaporation surface.

Therefore, how to solve the problems and the disadvantages of the capillary structure of the woven mesh in the heat dissipation unit is the direction of the improvement of the present inventors and the related industries.

Disclosure of Invention

The invention mainly aims to provide a capillary structure of a woven net, which is formed by weaving a single warp with a plurality of weft groups with the same thickness in a repeated and overlapped mode, so as to increase the pore number, ensure that the capillary structure has better capillary force and poly (water-containing) property and further improve the heat transfer efficiency.

In order to achieve the above objective, the present invention provides a woven mesh structure with capillary action for use in a two-phase flow heat dissipation unit; characterized by comprising the following steps:

a warp thread;

a weft group consisting of at least two wefts;

the woven mesh structure is formed by weaving a single warp yarn and a weft yarn group in a repeated and overlapped mode in sequence in a first weaving direction and a second weaving direction respectively.

The woven mesh structure with capillary action, wherein: the cross-sectional shape of at least one weft of the weft group is at least one circular cross-section.

The woven mesh structure with capillary action, wherein: the cross-sectional shape of the at least one warp thread is circular or non-circular.

The woven mesh structure with capillary action, wherein: the warp and the weft are made of metal or nonmetal.

The woven mesh structure with capillary action, wherein: the two-phase flow heat dissipation unit comprises an upper plate and a lower plate, wherein the upper plate covers the lower plate to jointly define a cavity filled with working liquid, and the woven mesh structure is arranged on the inner side of the upper plate and/or the lower plate of the cavity.

The woven mesh structure with capillary action, wherein: the two-phase flow heat dissipation unit is a temperature equalizing plate, a heat pipe or a loop heat pipe.

The woven mesh structure with capillary action, wherein: each weft in the weft group has the same thread diameter.

The woven mesh structure with capillary action, wherein: the woven mesh structure is formed by weaving all woven areas in a repeated and overlapped mode by utilizing a single warp yarn and a weft yarn group in sequence.

A woven mesh structure with capillary action is used in a two-phase flow heat dissipation unit; the method is characterized by comprising the step of knitting a single warp yarn and a single weft yarn in a repeated and overlapped mode to form the knitted net structure, wherein:

the local braiding area of the braided net structure is formed by matching a single warp with a weft group consisting of at least two wefts, and braiding the weft group in a repeated and overlapped mode in a first braiding direction and a second braiding direction respectively.

The woven mesh structure with capillary action, wherein: the woven mesh structure is provided with a heat source contact area corresponding to the heat source and a peripheral area surrounding the periphery of the heat source contact area, wherein the peripheral area is the local woven area.

The invention uses single warp and a weft group to weave in sequence in a repeated and overlapped mode, which can be applied to all woven areas or partial woven areas of the woven net structure, so that the woven net structure can increase the pore number, and has better capillary force, poly (water-containing) property and capillary action, and can effectively guide (reflux) the working fluid with directivity, fully diffuse and poly (water-containing) at the evaporation surface of the two-phase flow heat dissipation unit, thereby effectively preventing the dry burning of the evaporation surface and improving the heat exchange efficiency.

Drawings

Fig. 1 is an exploded perspective view of a two-phase flow heat dissipating unit according to the present invention.

Fig. 2 is a schematic top view of the woven mesh structure of the present invention.

Fig. 3 is a schematic top view of a woven mesh structure according to an alternative embodiment of the invention.

Fig. 4 is a schematic side view of the invention as seen on the left in fig. 2.

Fig. 5 is a schematic cross-sectional view of the woven mesh structure of the present invention disposed within a two-phase flow heat dissipating unit.

Fig. 6 is a schematic side view of a capillary structure of a conventional flat thinned mesh grid.

Reference numerals illustrate: a two-phase flow heat dissipation unit 100; an upper plate 101; a lower plate 102; a chamber 110; a woven mesh structure 200; warp yarn 20; a weft group 3; a weft 30; a flow directing microchannel 301; a mesh 4; a peripheral region 62 of the heat source contact region 61; an evaporation surface 111; a condensing surface 112; a wire diameter P1; a wire diameter P2; a pore t1; a first braiding direction Y; a second braiding direction X; staggered position a.

Detailed Description

The above objects of the present invention, as well as the structural and functional characteristics thereof, will be described in terms of the preferred embodiments of the present invention as illustrated in the accompanying drawings.

The invention provides a woven mesh structure with capillary action, please refer to fig. 1, 2, 4 and 5, the woven mesh structure 200 is applied in a two-phase flow heat dissipation unit 100 (such as a temperature equalizing plate, a heat pipe, a loop type heat pipe or a two-phase flow device), the two-phase flow heat dissipation unit 100 has a housing with a chamber, the housing is selectively illustrated by the temperature equalizing plate, the housing comprises an upper plate 101 and a lower plate 102, the upper plate 101 covers the lower plate 102 to jointly define a chamber 110 filled with a working liquid (as shown in fig. 5), and the woven mesh structure 200 can be selectively arranged on at least one inner side surface of the upper plate 101 and/or the lower plate 102 of the chamber 110.

The woven mesh structure 200 includes a plurality of warp yarns 20 and weft yarns 30. In this embodiment, at least two weft yarns 30 are selected as a weft yarn group 3 (the number of the weft yarn group may alternatively be more than two, three, four or other number of the weft yarn groups) in fig. 2 and 4, the weft yarns 30 are all made of wires with the same wire diameter (thickness) and are arranged, so that a plurality of weft yarn groups 3 are woven in a repeated and overlapping (staggered) manner along a second weaving direction X (e.g. transverse) and a single warp yarn 20 along a first weaving direction Y (e.g. longitudinal) in sequence to form the woven mesh structure 200.

In addition, under the same knitting area, the sum of the wire diameters P2 of each weft group 3 is smaller than or equal to the wire diameter P1 of a single warp 20, so that the number of wefts 30 is increased to construct a knitted net structure 200 with more pores t 1. Specifically, referring to fig. 2 and 4, each warp yarn 20 and each two weft yarns 30 of each group are sequentially woven repeatedly and in an overlapping manner to form a plurality of staggered portions a, and a void t1 is formed between each warp yarn 20 and each outer side of each two weft yarns 30 in each staggered portion a, so that the number of voids t1 can be increased.

Therefore, by using the present invention, the woven mesh structure 200 can be applied to all woven areas or partial woven areas, so that the woven mesh structure 200 can have a larger porous number by using a single warp 20 to match with a group of weft groups 3, so that the woven mesh structure 200 can have better poly (water-containing) property and capillary action, and further, the capillary force and heat dissipation efficiency of the woven mesh structure 200 can be improved. In practical applications, a user can design the whole or partial position (area) of the woven mesh structure 200 according to the type (such as a temperature equalization plate or a heat pipe) of the two-phase flow heat dissipation unit 100 and/or the requirement of providing more poly (water-containing) and capillary action corresponding to the heat source position, weave the woven mesh structure with a group of weft yarns 3 (with a plurality of weft yarns 30) by using a single warp yarn 20, adjust the distance between the warp yarns 20 and/or between the weft yarns 30 and the weft yarns 30, and further adjust the density of the warp yarns 20 and the weft yarns 30, so as to flexibly use the different changes of the number composition between the warp yarns 20 and the weft yarns 30 to adjust the flow guiding (reflux), poly (water-containing) characteristics and capillary effect of the whole or partial position of the woven mesh structure 200, thereby further effectively applying the heat dissipation requirement required by each part of the two-phase flow heat dissipation unit 100 of different types.

In addition, the cross-sectional shape of the single warp yarn 20 of the present invention may be a circular cross-section (as shown in fig. 4) or a non-circular cross-section (such as an elliptical cross-section or a flat cross-section or a honeycomb cross-section or any geometric cross-section);

the plurality of wefts 30 in the group of wefts may have the same or non-same cross-sectional shape (as shown in fig. 4, which is two circular cross-sections or two non-circular cross-sections or any geometric cross-sections with the same side view from the left direction in fig. 2), and at least two diversion micro-channels 301 are formed between the two wefts 30 in the group of wefts 3 and located above and below the contact position of the two wefts 30, respectively, and extend along the length direction of the wefts 30.

In addition, the warp yarn 20 and the weft yarn 30 may be made of metal or nonmetal (plastic or stone). That is, the warp yarn 20 and the weft yarn 30 may be made of the same material (or may be made of different materials).

Referring back to fig. 1, 2 and 5, the lower plate 102 of the two-phase flow heat dissipating unit 100 is attached to a heat source (such as a cpu or a graphics processor or other electronic units; not shown), the inner side of which forms an evaporation surface 111, and the inner side of the upper plate 101 forms a condensation surface 112 facing the evaporation surface 111. In the present invention, the mesh-grid structure 200 may be disposed on the evaporation surface 111 of the surface of the lower plate 102. When the lower plate 102 of the two-phase flow heat dissipating unit 100 absorbs heat from the heat source, the heat is transferred to the evaporation surface 111, so that the liquid working fluid on the evaporation surface 111 evaporates into a gaseous working fluid flowing to the condensation surface. The gaseous working fluid is then condensed into a liquid working fluid by heat exchange between the condensing surface 112 and the outside air. However, the liquid working fluid on the condensation surface 112 can return to the inner side of the lower plate 102 through the gravity or other capillary structures, and the invention makes the number ratio of the single warp threads and the plurality of weft threads 20 and 30 different, so that the woven mesh structure 200 can have more pores and multiple diversion micro-channels 301 for improving the reflux speed of the working fluid to the evaporation surface 111, and has directional guiding flow so as to be rapidly dispersed and distributed on the evaporation surface 111, and has better poly (water) characteristic at the area of the evaporation surface 111, thereby preventing the possibility of dry burning. Thus, the boiling evaporation of the working fluid on the evaporation surface 111 and the response speed to temperature are facilitated, and the condensed working fluid on the condensation surface 112 is quickly and continuously returned to the evaporation surface 111 to avoid dry heating, so that the liquid-vapor phase circulation speed of the working fluid in the chamber 110 can be effectively accelerated, and the heat dissipation efficiency is further effectively improved.

As described above, all the knitting areas (areas) of the mesh structure 200 of the present embodiment can adopt a knitting mode or pattern of one warp 20 and one weft group 3 (a plurality of weft 30 with the same thickness). However, in an alternative embodiment, referring to fig. 3 and 5, the woven mesh structure 200 may be woven by a single warp and a single weft in a conventional manner, and only the partial woven area (area) of the woven mesh structure 200 is selected to adopt the weaving manner of the present invention by a single warp 20 and a group of weft groups 3 (consisting of a plurality of weft 30 with the same thickness), while the rest is still woven in a conventional or conventional manner. For example, the woven mesh structure 200 has a heat source contact area 61 and a peripheral area 62 corresponding to the heat source, the heat source contact area 61 is located at the center of the woven mesh structure 200 and can be woven by sequentially repeating and overlapping (staggered) the single warp yarn 20 and the single weft yarn 30, and the peripheral area 62 is woven by sequentially repeating and overlapping (staggered) the single warp yarn 20 and a group of weft yarns 3 according to the invention so as to be woven around the periphery of the heat source contact area 61. Specifically, the heat source contact area 61 of the mesh-grid structure 200 is disposed in the chamber 110 of the two-phase flow heat dissipating unit 100 and corresponds to the evaporation surface 111 of the heat source, so that the working fluid adsorbed by the heat source contact area 61 of the mesh-grid structure 200 can be quickly evaporated after being heated, and the condensed working fluid can be quickly returned by virtue of the better capillary force and the poly (water-containing) property of the peripheral area 62 of the mesh-grid structure 200, and the poly (water-containing) is located at the periphery of the heat source contact area 61, so that the working fluid is timely provided to the heat source contact area 61 to prevent the evaporation surface 111 from being dry-burned.

Of course, the present invention can be used to match a single warp 20 with a set of weft 3 of the woven mesh structure 200 in either the heat source contact area 61 or the peripheral area 62.

In summary, the single warp yarn 20 of the woven mesh structure 200 is woven by at least two weft yarn groups 3, which are a group, in a repeated and overlapping (staggered) manner, so that the number of more holes can be greatly increased under a fixed weaving area, and the warp yarn 20 and the weft yarn 30 can be changed according to the different number of the warp yarn 20 and the weft yarn 30 to form the woven mesh structure 200 with more diversion micro-channels 301.

While the invention has been described in detail in the foregoing description, the same is to be considered as illustrative and not restrictive in character, for the invention to be practiced and carried out. All equivalent changes and modifications according to the present invention should be made within the scope of the present invention.

Claims (10)

1. A woven mesh structure with capillary action, which is used in a two-phase flow heat dissipation unit; characterized by comprising the following steps:

a warp thread;

a weft group consisting of at least two wefts;

the woven mesh structure is formed by weaving a single warp yarn and a weft yarn group in a repeated and overlapped mode in sequence in a first weaving direction and a second weaving direction respectively.

2. The wicking mesh-structure of claim 1, wherein: the cross-sectional shape of at least one weft of the weft group is at least one circular cross-section.

3. The wicking mesh-structure of claim 1, wherein: the cross-sectional shape of the at least one warp thread is circular or non-circular.

4. The wicking mesh-structure of claim 1, wherein: the warp and the weft are made of metal or nonmetal.

5. The wicking mesh-structure of claim 1, wherein: the two-phase flow heat dissipation unit comprises an upper plate and a lower plate, wherein the upper plate covers the lower plate to jointly define a cavity filled with working liquid, and the woven mesh structure is arranged on the inner side of the upper plate and/or the lower plate of the cavity.

6. The wicking mesh-structure of claim 1, wherein: the two-phase flow heat dissipation unit is a temperature equalizing plate or a heat pipe.

7. The wicking mesh-structure of claim 1, wherein: each weft in the weft group has the same thread diameter.

8. The wicking mesh-structure of claim 1, wherein: the woven mesh structure is formed by weaving all woven areas in a repeated and overlapped mode by utilizing a single warp yarn and a weft yarn group in sequence.

9. A woven mesh structure with capillary action is used in a two-phase flow heat dissipation unit; the method is characterized by comprising the step of knitting a single warp yarn and a single weft yarn in a repeated and overlapped mode to form the knitted net structure, wherein:

the local braiding area of the braided net structure is formed by matching a single warp with a weft group consisting of at least two wefts, and braiding the weft group in a repeated and overlapped mode in a first braiding direction and a second braiding direction respectively.

10. The wicking mesh-structure of claim 9, wherein: the woven mesh structure is provided with a heat source contact area corresponding to the heat source and a peripheral area surrounding the periphery of the heat source contact area, wherein the peripheral area is the local woven area.