CN116695305A - Knitting structure of fine wool net - Google Patents

Abstract

The invention provides a capillary mesh knitting structure, 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 different diameters, and the two wefts are sequentially knitted into the capillary mesh knitting structure in a repeated and overlapping (staggered) mode, so that the pores and the pore numbers with different sizes are increased, the capillary mesh knitting structure can have better capillary force and poly (water-containing) characteristics, and the heat transfer efficiency is greatly improved.

Description

Knitting structure of fine wool net

Technical Field

The present invention relates to a capillary structure, and more particularly, to a woven structure of a capillary mesh with improved capillary force and water-containing property, thereby improving capillary heat transfer efficiency.

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. 8, taiwan patent No. 201525398A discloses a flat and thin woven mesh capillary structure of an ultrathin heat pipe and an ultrathin heat pipe structure thereof, and mainly discloses that the flat and thin woven mesh capillary structure 5 comprises a plurality of first woven wires 51 in a warp direction and a plurality of second woven wires 52 in a weft direction which are repeatedly and alternately woven with each other, and two adjacent first woven wires 51 and two adjacent second woven 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 weaving type is simply woven by repeating and interlacing the first and second weaving wires 51, 52, and the diameters (thickness, diameter) thereof are the same, and the mutual cross-linking (interlacing) weaving in the warp and weft directions is performed, so that the size of the pores is fixed, and the number of pores and meshes is also fixed, so that the application of capillary force (such as increasing the water content in the capillary structure area or local area, and transverse water absorption) is too much than the single (adjustment) limitation;

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

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 main purpose of the present invention is to provide a capillary mesh knitting structure which is knitted by a single warp and a weft group (composed of a plurality of weft with different thickness and number) in a repeated overlapping (staggered) mode, and by the matching of the different number proportion of the two with different wire diameters, the pore and pore number of the capillary mesh knitting structure with different sizes are increased, so that the capillary mesh knitting structure has better capillary force and poly (water) property, and the heat transfer efficiency is greatly improved.

In order to achieve the above object, the present invention provides a capillary mesh woven structure for use in a two-phase flow heat dissipation unit, comprising:

a warp thread;

a weft group at least comprising two wefts with different wire diameters;

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

The capillary mesh woven structure comprises: each weft in the weft group is of a different thread diameter.

The capillary mesh woven structure comprises: the wire diameter of the single warp is larger than or equal to the sum of the wire diameters of the weft groups.

The capillary mesh woven structure comprises: the cross-sectional shape of at least one weft yarn in the weft yarn group is at least one circular cross-section.

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

The capillary mesh woven structure comprises: the warp and the weft may be at least one of metal or nonmetal.

The capillary mesh woven structure comprises: 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 capillary mesh weaving structure is arranged on the inner side of the upper plate and/or the lower plate of the cavity.

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

The capillary mesh knitting structure is used in a two-phase flow heat dissipation unit and is characterized by comprising a single warp and a single weft which are knitted into the capillary mesh knitting structure in a mode of orderly and repeatedly overlapping in two staggered directions, wherein:

the local knitting area of the capillary net knitting structure is formed by matching a single warp with a weft group consisting of at least two wefts with different wire diameters, and the warp and the weft group are knitted in a repeated and overlapped mode in a first knitting direction and a second knitting direction respectively.

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

Therefore, the capillary mesh knitting structure of the invention uses a combination that a single warp is matched with a weft group (which is composed of a plurality of wefts with different thicknesses and numbers) to mutually repeat and overlap knitting, and can be applied to all knitting areas (areas) or partial knitting areas (areas) of the capillary mesh knitting structure, so that the capillary mesh knitting structure can increase the pores and the numbers of the capillary mesh knitting structure with different sizes to form a compact and tough mesh structure, further has better capillary force, poly (water-containing) property and capillary action, and can effectively lead (reflux) 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 dry burning of the evaporation surface and improving heat exchange efficiency.

Drawings

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

FIG. 2 is a schematic top view of a woven structure of a capillary mesh according to the present invention;

FIG. 3 is a schematic top view of a woven mesh structure according to another embodiment of the invention;

fig. 4 and 5 are schematic top views of a woven mesh structure according to an alternative embodiment of the present invention;

FIG. 6 is a schematic side view of the present invention from the left in FIG. 2;

FIG. 7 is a schematic cross-sectional view of the wick mesh woven structure of the present invention disposed within a two-phase flow heat dissipating unit;

fig. 8 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; an evaporation surface 111; a condensing surface 112; a capillary mesh braid structure 200; warp yarn 20; weft yarns (first weft yarn, second weft yarn) 30, 30'; a weft group 3; a flow directing microchannel 301; a mesh 4; a heat source contact region 61; a peripheral region 62; pores t1, t1'; warp thread diameter P1; a first weft thread diameter P2; a second weft thread diameter P3; a first braiding direction Y; a second braiding direction X; staggered position a.

Detailed Description

The above objects and structural and functional features of the present invention will be described in terms of the embodiments of the accompanying drawings, which are provided for reference and illustration only, and are not intended to limit the invention.

Please refer to fig. 1, 2, 3, 6 and 7. As shown in the drawing, the capillary mesh braid structure 200 is disposed in a two-phase flow heat dissipation unit (may be the two-phase flow heat dissipation unit 100, such as a temperature equalizing plate, a flat heat pipe, a loop heat pipe or a two-phase flow device). As shown in fig. 1 and 7, the two-phase flow heat dissipation unit 100 has a housing, which is selectively illustrated by a temperature equalization plate, and the housing includes an upper plate 101 covering a lower plate 102 and together defining a chamber 110 (as shown in fig. 7) filled with a working fluid, and the capillary mesh structure 200 may be selectively disposed on at least any inner side surface of the upper plate 101 and/or the lower plate 102.

The capillary mesh weave structure 200 includes a plurality of warp yarns 20 and weft yarns 30. In the embodiment of fig. 2, 3 and 6, at least two first and second wefts 30, 30 'are selected as a group of wefts 3 (the number of the group may alternatively be more than two, three, four or other numbers of the groups may be used), and each weft 30, 30' in the group of wefts 3 is formed by tightly arranging wires with different wire diameters (thicknesses) from each other, so that each weft group 3 of the group is woven in a manner that each single warp 20 in a second weaving direction X (e.g. transverse direction) and each single warp 20 in a first weaving direction Y (e.g. longitudinal direction) are staggered in different directions and are sequentially and repeatedly overlapped to form the capillary mesh woven structure 200.

In addition, under the same knitting area, the two first and second wefts 30 and 30' in each weft group 3 have first and second weft diameters P2 and P3 with different thicknesses, the first weft diameter P2 is larger than the second weft diameter P3, both of which are smaller than the warp diameter P1 of the single warp 20, and the warp diameter P1 of the single warp 20 is larger than or equal to the sum of the first and second weft diameters P2 and P3 of each weft group 3, so that the capillary mesh knitting structure 200 with holes (gaps) t1 and t1' with different sizes and pore numbers can be constructed by increasing the number of the first and second wefts 30 and 30' with different thicknesses. Specifically, with continued reference to fig. 2 and 6, each warp yarn 20 and at least two first and second weft yarns 30, 30 'of different thicknesses in each weft yarn group 3 are sequentially woven in a repeated and overlapping (staggered) manner to form a plurality of staggered positions a, and two hole (gap) gaps t1, t1' of different sizes are formed between the warp yarn 20 and the respective outer sides of each first and second weft yarns 30, 30 'of different thicknesses in each staggered position a, so as to be arranged, and the hole (gap) gaps t1, t1' (shown in fig. 6) of different sizes can be provided and the hole (gap) number can be increased. Further, the first and second wefts 30 and 30' of the adjacent two warps 20 and the adjacent weft group 3 are commonly surrounded with a mesh 4.

In addition, the single warp yarn 20 of the present invention has a warp yarn diameter P1, and the cross-sectional shape thereof may 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 cross-section or any geometric cross-section);

the plurality of wefts 30, 30 'in the weft set 3 have first and second weft diameters P2, P3 with different thicknesses, and the cross-sectional shapes thereof may be the same or different (as shown in fig. 6, which is a large circular cross-section, a small circular cross-section, or two non-circular cross-sections or any geometric cross-sections viewed from the left direction in fig. 2), and at least two diversion micro-channels 301 are formed between the first weft 30 and the second weft 30' included in the weft set 3 and located above and below the contact point of the first and second wefts 30, 30 '(as shown in fig. 6), and extend along the length direction of the first and second wefts 30, 30'.

The warp 20 and weft 30, 30' may be made of metal or nonmetal (such as plastic or stone) with certain toughness and good thermal conductivity. That is, the warp yarn 20 and the weft yarns 30, 30' are made of the same material (or different materials).

With reference to fig. 1 and 7, fig. 2, 3 and 6 are also shown. The lower plate 102 of the two-phase flow heat dissipating unit 100 is attached to a heat source (such as a cpu, a graphics processor, or other electronic units; not shown), and has an evaporation surface 111 formed on the inner side thereof, and a condensation surface 112 formed on the inner side of the upper plate 101 faces the evaporation surface 111. The capillary mesh weave structure 200 of the present invention may be disposed on any one of the evaporation surface 111 and the condensation surface 112, and in the embodiment of the present invention, the capillary mesh weave structure 200 is disposed on the evaporation surface 111 of the surface of the lower plate 102. When the two-phase flow heat dissipating unit 100 operates, the lower plate 102 absorbs 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 be quickly evaporated into a gaseous working fluid, and the gaseous working fluid quickly flows to the condensation surface 112. The gaseous working fluid is then recondensed into a liquid working fluid upon heat exchange between the condensation surface 112 and the outside 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 capillary structure, by the combination of the single warp 20 and the plurality of wefts 30 (30 '), the warp 20 and the weft 30 (30') can have more different small holes (gaps) t1 and t1 'and increase the number of holes (gaps) and the multi-diversion micro-channel 301 to promote the reflux speed of the working fluid to the evaporation surface 111 under the different application of the composition number proportion and the wire diameter thickness of the warp 20 and the weft 30 (30'), and the directional guiding flow can be rapidly distributed on the evaporation surface 111, and has better poly (water) characteristic at the area of the evaporation surface 111, so as to prevent the possibility of dry burning. In this way, the boiling evaporation of the working fluid on the evaporation surface 111 and the response speed to the 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, and the next cyclic action of endothermic evaporation and exothermic condensation can be quickly performed, so that the cyclic action reaches the continuous liquid and vapor phase change cycle to continuously transfer heat, the liquid and vapor phase change cycle speed of the working fluid in the chamber 110 can be effectively accelerated, the heat transfer effect of the high temperature region of the heat source is effectively improved, and the heat dissipation efficiency is further improved. In this way, the two-phase flow heat dissipation unit 100 achieves good temperature uniformity and heat dissipation.

In practical applications, the capillary mesh knitting structure 200 can utilize a single warp 20 to match with holes (gaps) t1 and t1 'formed by the knitting combination of a group of weft groups 3 in all knitting areas (areas) or partial knitting areas (areas), and can adjust the respective wire diameter sizes of the first and second wefts 30 and 30' in the warp 20 and weft groups 3 of the capillary mesh knitting structure 200 according to any or all requirements of poly (water) and capillary action to adjust the sizes of the holes (gaps), or adjust the distance between the warp 20 and/or between the first and second wefts 30 and 30', so as to adjust the density between the warp 20 and weft 30 (30'), thereby being more effectively applied to the heat dissipation requirements of each part of different types of two-phase flow heat dissipation units 100 (such as temperature equalizing plates or heat pipes).

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

As described above, all the knitting areas (areas) of the capillary mesh knitting structure 200 of the present embodiment can adopt a knitting mode or pattern of a single warp yarn 20 and a weft yarn set 3 (a plurality of weft yarns 30, 30') with different thicknesses. However, in an alternative embodiment, referring to fig. 4 and 5, the capillary mesh knitting structure 200 may be generally knitted by a single warp yarn and a single weft yarn, and only the partial knitting area of the capillary mesh knitting structure 200 is selected to adopt the knitting mode of the present invention by a single warp yarn 20 and a group of weft yarn groups 3 (composed of a plurality of weft yarns 30, 30') with different thicknesses, while the rest portion is still knitted in a general or conventional knitting mode. For example, the capillary mesh knitting structure 200 has a heat source contact area 61 located at the center and corresponding to a heat source, and a peripheral area 62 located around the heat source contact area 61, wherein the heat source contact area 61 can be knitted by a conventional single warp yarn and a single weft yarn in a repeated and overlapping (staggered) manner, and the peripheral area 62 is knitted by a single warp yarn 20 and a group of weft yarn groups 3 of the same or different thickness in a repeated and overlapping (staggered) manner, so as to be knitted around the periphery of the heat source contact area 61. Specifically, the heat source contact area 61 of the capillary mesh knitting structure 200 is disposed 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 working fluid adsorbed by the heat source contact area 61 of the capillary mesh knitting structure 200 can be quickly evaporated after being heated, and meanwhile, the condensed working fluid can be quickly returned by virtue of the better capillary force and the poly (water-containing) characteristic of the peripheral area 62 of the capillary mesh knitting 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, so as to prevent the evaporation surface 111 from being dry-burned.

Of course, the wick net weaving structure 200 of the present invention can be used to match a single warp yarn 20 with a group of weft yarn groups 3 in either the heat source contact area 61 or the peripheral area 62 according to the requirement.

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 capillary mesh braid structure for use in a two-phase flow heat dissipating unit comprising:

a warp thread;

a weft group at least comprising two wefts with different wire diameters;

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

2. The capillary mesh braid structure of claim 1, wherein: each weft in the weft group is of a different thread diameter.

3. The capillary mesh braid structure of claim 1, wherein: the wire diameter of the single warp is larger than or equal to the sum of the wire diameters of the weft groups.

4. The capillary mesh braid structure of claim 1, wherein: the cross-sectional shape of at least one weft yarn in the weft yarn group is at least one circular cross-section.

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

6. The capillary mesh braid structure of claim 1, wherein: the warp and the weft may be at least one of metal or nonmetal.

7. The capillary mesh braid 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 capillary mesh weaving structure is arranged on the inner side of the upper plate and/or the lower plate of the cavity.

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

9. The capillary mesh knitting structure is used in a two-phase flow heat dissipation unit and is characterized by comprising a single warp and a single weft which are knitted into the capillary mesh knitting structure in a mode of orderly and repeatedly overlapping in two staggered directions, wherein:

the local knitting area of the capillary net knitting structure is formed by matching a single warp with a weft group consisting of at least two wefts with different wire diameters, and the warp and the weft group are knitted in a repeated and overlapped mode in a first knitting direction and a second knitting direction respectively.

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