CN219637447U

CN219637447U - Capillary knitting net structure

Info

Publication number: CN219637447U
Application number: CN202321099928.0U
Authority: CN
Inventors: 杨修维
Original assignee: Asia Vital Components Shenzhen Co Ltd
Current assignee: Asia Vital Components Shenzhen Co Ltd
Priority date: 2023-05-08
Filing date: 2023-05-08
Publication date: 2023-09-05
Anticipated expiration: 2033-05-08

Abstract

The utility model provides a capillary knitting net structure, which comprises a plurality of knitting lines, wherein a single knitting line is matched with a line group, the line group is composed of a plurality of knitting lines, and any one of the two knitting lines is knitted into a net structure state in a repeated and overlapped (staggered) mode respectively in a first knitting direction and a second knitting direction, and the capillary knitting net structure is applied to a two-phase flow radiating unit, thereby greatly improving the capillary force and the poly (water) characteristic and further improving the heat transfer efficiency.

Description

Capillary knitting net structure

Technical Field

The present utility model relates to a capillary structure, and more particularly, to a capillary woven mesh structure 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 transfer performance of two-phase flow devices such as these is mainly determined by capillary structure.

Referring to fig. 12, a taiwan patent publication No. 201525398A provides a flat thin woven mesh capillary structure of an ultrathin heat pipe and an ultrathin heat pipe structure thereof, and mainly discloses that the flat thin woven mesh capillary structure 5 comprises a plurality of warp threads 51 and a plurality of weft threads 52 which are repeatedly and alternately woven with each other, and a mesh is arranged around each warp thread 51 and each weft thread 52. Wherein each warp and weft has 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, and the cross section shape of each connecting section 53 of each warp and weft is flat, so as to obtain a thinned flat thinned woven mesh capillary structure.

However, the capillary structure of the conventional weaving pattern is formed by repeatedly and alternately weaving only single warp and weft yarns 51 and 52, and the diameters (thickness and diameter) of the capillary structure are the same, and the capillary structure is formed by mutually and alternately weaving the capillary structure in the warp and weft directions, wherein the size of the pore is fixed, and the number of pores and meshes is limited, so that the application of capillary force (such as the increase of (poly) water content and transverse water absorption property in the capillary structure area or local area) is too limited to single (adjustment) and lacks flexible transportation;

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 flexible application of the two-phase flow device and can be matched according to the requirements of characteristics, so that the water content is insufficient and the overall capillary force is poor, and further the problems of dry burning (dry-out) and reduced heat transfer efficiency are caused due to insufficient water content at the evaporation surface of the temperature equalization plate or excessive backwater.

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

Disclosure of Invention

The utility model mainly aims to provide a capillary knitting net structure which is formed by knitting a single knitting line and a group of lines formed by a plurality of knitting lines in a repeated and overlapped mode, wherein the line diameters of the knitting lines in the line group can be selected to be partially the same, partially different or totally the same, so that the capillary knitting net structure has pores with the same or different sizes and effectively increases the pore number, thereby greatly improving the capillary force and poly (water) characteristic of the knitting net structure and further improving the heat transfer efficiency.

In order to achieve the above-mentioned object, the present utility model provides a capillary woven mesh structure for use in a two-phase flow heat dissipation unit, which is characterized in that it comprises a plurality of woven wires;

the capillary knitting net structure is formed by matching a single knitting line with a line group, wherein the line group is formed by a plurality of knitting lines, and the single knitting line and the line group are respectively knitted in a first knitting direction and a second knitting direction or respectively in a second knitting direction and a first knitting direction in a repeated and overlapped mode.

The capillary woven mesh structure, wherein: the wire diameter portions of the braided wires in the wire group are the same or partially different.

The capillary woven mesh structure, wherein: the cross-sectional shape of at least one braided wire in the wire set is at least one circular cross-section.

The capillary woven mesh structure, wherein: the cross-sectional shape of the single knitting yarn is a circular cross-section or a non-circular cross-section.

The capillary woven mesh structure, wherein: each braided wire in the wire set is of different wire diameters.

The capillary woven mesh structure, wherein: the wire diameter of the single braided wire is greater than or equal to the sum of the wire diameters of the wire groups.

The capillary woven mesh structure, wherein: the single braided wire and the braided wires of the wire group are made of at least one of metal or nonmetal.

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

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

The capillary knitting net structure is used in a two-phase flow heat dissipation unit and is characterized by comprising a single knitting wire and another single knitting wire which are knitted into the capillary knitting net structure in a repeated and overlapped mode in different directions, wherein:

the local braiding area of the capillary braiding net structure is formed by matching a single braiding line with a line group, the line group is formed by a plurality of braiding lines, and the single braiding line and the line group are braided in a repeated and overlapped mode in a first braiding direction and a second braiding direction or in a second braiding direction and a first braiding direction respectively.

The capillary woven mesh structure, wherein: the wire diameter of each braided wire in the wire group is partially the same or partially different or all different.

The capillary woven mesh structure, 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.

Therefore, the capillary knitting net structure can be applied to all knitting areas (areas) or partial knitting areas (areas) of the capillary knitting net structure by combining a single knitting line with a line group (which is formed by combining a plurality of knitting lines with the same or different thicknesses and different numbers) in sequence, so that the capillary knitting net structure has pores with the same or different sizes and effectively increases the number of pores, a compact and tough net structure is formed, the capillary acting force and the water collecting (containing) characteristic are greatly improved, directional rapid diversion (backflow) of working fluid, comprehensive diffusion and water collecting (containing) at the evaporation surface of the two-phase flow heat dissipation unit can be effectively prevented, the evaporation surface is effectively prevented from being dry-burned, and the heat exchange efficiency is improved.

Drawings

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

FIG. 2 is a schematic top view of a capillary knitted mesh structure according to the present utility model;

FIG. 3 is a schematic top view of another alternative embodiment of the present utility model;

FIG. 4 is a schematic top view of yet another alternative embodiment of the present utility model;

FIG. 5 is a schematic top view of yet another alternative embodiment of the present utility model;

FIG. 6 is a schematic top view of a further alternative embodiment of the present utility model;

FIGS. 7 and 8 are schematic top views of a capillary knitted mesh structure according to an alternative embodiment of the present utility model;

FIG. 9 is a schematic side view of the present utility model from the left side of FIG. 2;

FIG. 10 is a schematic side view of the present utility model from the left of FIG. 3;

FIG. 11 is a schematic cross-sectional view of a capillary knitted mesh structure of the present utility model disposed within a two-phase flow heat dissipating unit;

fig. 12 is a schematic side view of a conventional capillary structure of a 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; capillary knitted mesh structure 200; warp yarn 20; a flow directing microchannel 301; weft yarns (first and second weft yarns) 30, 30'; weft yarn set (thread set) 3; 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 (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 utility model 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 utility model.

Please refer to fig. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11. As shown in the drawing, the capillary weave mesh structure 200 is disposed in a two-phase flow heat dissipating unit (which may be the two-phase flow heat dissipating 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 11, the two-phase flow heat dissipation unit 100 has a housing, which is optionally illustrated as 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. 11) filled with a working fluid, and the capillary-knitted mesh structure 200 may be selectively disposed on at least one inner side surface of the upper plate 101 and/or the lower plate 102.

The capillary-knitted mesh structure 200 includes a plurality of knitting yarns knitted in two different directions (e.g., a first knitting direction and a second knitting direction) in a staggered and sequentially repeatedly overlapping manner. In the following embodiments of the present utility model, a single knitting yarn is matched with a yarn set (which is formed by combining a plurality of knitting yarns with the same or different thickness and different number), so that the single knitting yarn and the yarn set are sequentially knitted into the capillary knitting mesh structure 200 in a repeated and overlapping (staggered) manner. In the present embodiment, a single knitting yarn is selected as the warp yarn 20, and the yarn set 3 is selected as a plurality of weft yarns 30, which is described below, but is not limited thereto. In the embodiment of fig. 2, 3, 4 and 5, at least two first and second wefts 30, 30 'are selected as a group of weft yarn groups (yarn groups) 3 (the number of the group may be selected to be more than two, three, four or other number of the group of weft yarns may be applied), the wefts 30, 30' in the weft yarn groups (yarn groups) 3 are tightly arranged with wires having the same yarn diameter or different yarn diameters (thicknesses) with each other, so that each weft yarn group 3 of multiple groups is woven with each single warp yarn 20 along a second weaving direction X (e.g. transverse direction) and along a first weaving direction Y (e.g. longitudinal direction), and the two warp yarns are staggered in different directions and are sequentially repeatedly overlapped to form the capillary mesh woven structure 200.

In addition, under the same knitting area, the two wefts (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 respectively 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 number of the first and second wefts 30 and 30' with different thicknesses is increased to construct the capillary knitting net structure 200 with holes (gaps) t1 and t1' with more different sizes. Specifically, as shown in fig. 2, 3, 9 and 10, each warp yarn 20 and at least two first and second weft yarns 30, 30 'with the same or 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 holes (gaps) t1, t1' with the same or different sizes are formed between the warp yarn 20 and the outer sides of the first and second weft yarns 30, 30 'with the same or different thicknesses in each staggered position a, so that the number of the holes (gaps) t1, t1' (shown in fig. 9 and 10) and the number of the holes (gaps) with the same or different sizes 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 utility model 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 wire diameters P2, P3 with different thicknesses, and the cross-sectional shapes thereof may be the same or non-same (as shown in fig. 9, the cross-sectional view 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 wire 30 and the second weft wire 30' assembled in the weft set 3 and located above and below the contact point of the first and second weft wires 30, 30 '(as shown in fig. 9) and extend along the length direction of the first and second weft wires 30, 30'. As shown in fig. 3 and 10, the two wefts 30 assembled in the weft group 3 have the same weft wire diameter P2, and the cross-sectional shape thereof may be two circular cross-sections (or two non-circular cross-sections or any geometric cross-sections) which are slightly identical.

In the embodiment of fig. 4 and 5, a single warp yarn 20 may be matched with four weft yarns 30, 30', 30' of the same or different thickness to form a weft yarn group 3; as in the embodiment of fig. 6, a warp yarn 20 of the same or different thread diameters is selected to be matched with a weft yarn group 3 consisting of five weft yarns 30 of the same or different thread diameters. The capillary knitted mesh structure 200 is knitted in a repeated and overlapping manner by matching the different number ratios of the warp yarns and the weft yarns with different wire diameters.

In the above embodiment of the present utility model, a single knitting yarn may be selected as the weft yarn, and the yarn set may be selected as a plurality of warp yarns.

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

With reference to fig. 1 and 11, fig. 2, 3, 4, 5, 6, 9, and 10 are shown. The lower plate 102 of the two-phase flow heat dissipating unit 100 is contacted with a heat source (such as a cpu or a graphics processor; not shown), 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. The wick-braid mesh structure 200 of the present utility model may be selectively disposed on at least one of the evaporation surface 111 or the condensation surface 112, and in the embodiment of the present utility model, the wick-braid mesh structure 200 is selectively disposed on the evaporation surface 111 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 other capillary structures, by the combination of the single warp yarn 20 and the plurality of weft yarns 30 (30 '), the warp yarn 20 and the weft yarn 30 (30') can have more holes (gaps) t1 and t1 'with the same or different sizes and the increased number of holes (gaps) and the multi-diversion micro-channels 301 for improving 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 yarn 20 and the weft yarn 30 (30'), and the directional guiding flow can be rapidly distributed on the evaporation surface 111, and the better poly (water) characteristic is provided 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-knitted mesh structure 200 can utilize a single knitting yarn (e.g. warp yarn 20) to match with the holes (gaps) t1, t1 'formed by the knitting combination of a group of yarn groups (e.g. weft yarn group 3) in all knitting areas (areas) or partial knitting areas (areas), and can adjust the sizes of the respective yarn diameters of the warp yarn 20 and the first weft yarn 30, 30' of the weft yarn group 3 of the capillary-knitted mesh structure 200 according to any or all requirements of poly (water-containing) and capillary action to adjust the sizes of the holes (gaps), or adjust the distance between the warp yarn 20 and/or the first weft yarn 30 and the second weft yarn 30', so as to adjust the density between the warp yarn 20 and the weft yarn 30 (30'), thereby being more effective in the heat dissipation requirements of each part of the two-phase flow heat dissipation units 100 (e.g. temperature equalizing plates or heat pipes) of different types.

Furthermore, the capillary-knitted mesh 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 knitted mesh structure 200 of the present embodiment can be a knitting mode or a pattern in which a single knitting yarn (e.g. warp yarn 20) is matched with a yarn set (e.g. weft yarn set 3; a plurality of weft yarns 30, 30') with the same or different thickness. However, in another embodiment, referring to fig. 7 and 8, the capillary knitted mesh structure 200 may be generally knitted by a single warp yarn and a single weft yarn, only the local knitted area of the capillary knitted mesh structure 200 is selected to be knitted by a single knitting yarn (e.g. warp yarn 20) and a group of yarn groups (e.g. weft yarn group 3; consisting of a plurality of weft yarns 30, 30' with the same or different thickness), while the rest is knitted by a general or conventional knitting method. For example, the capillary weave mesh 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 woven by a conventional single warp yarn and a single weft yarn in a repeated and overlapping (staggered) manner, and the peripheral area 62 can be woven 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 weave around the periphery of the heat source contact area 61. Specifically, the heat source contact area 61 of the capillary knitting mesh 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 capillary knitting mesh 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 capillary knitting mesh 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, thereby preventing the evaporation surface 111 from being dry-burned.

Of course, the capillary knitted mesh structure 200 of the present utility model can be used with a single knitting yarn and a set of yarns in either the heat source contact area 61 or the peripheral area 62 as required.

While the utility model has been described in detail in connection with the present utility model, it is to be understood that the same is by way of illustration and example only and is not intended to be limited to the specific embodiments disclosed herein. All equivalent changes and modifications according to the present utility model should be made within the scope of the present utility model.

Claims

1. A capillary braiding net structure is used in a two-phase flow radiating unit and is characterized by comprising a plurality of braiding wires;

2. The capillary knitted mesh structure of claim 1, wherein: the wire diameter portions of the braided wires in the wire group are the same or partially different.

3. The capillary knitted mesh structure of claim 1, wherein: the cross-sectional shape of at least one braided wire in the wire set is at least one circular cross-section.

4. The capillary knitted mesh structure of claim 1, wherein: the cross-sectional shape of the single knitting yarn is a circular cross-section or a non-circular cross-section.

5. The capillary knitted mesh structure of claim 1, wherein: each braided wire in the wire set is of different wire diameters.

6. The capillary knitted mesh structure of claim 1, wherein: the wire diameter of the single braided wire is greater than or equal to the sum of the wire diameters of the wire groups.

7. The capillary knitted mesh structure of claim 1, wherein: the single braided wire and the braided wires of the wire group are made of at least one of metal or nonmetal.

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

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

10. The capillary knitting net structure is used in a two-phase flow heat dissipation unit and is characterized by comprising a single knitting wire and another single knitting wire which are knitted into the capillary knitting net structure in a repeated and overlapped mode in different directions, wherein:

11. The capillary knitted mesh structure of claim 10, wherein: the wire diameter of each braided wire in the wire group is partially the same or partially different or all different.

12. The capillary knitted mesh structure of claim 10, 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.