CN219861791U - Reticular capillary knitting structure - Google Patents

Abstract

The utility model provides a reticular capillary braiding structure, which is applied to a two-phase flow radiating unit and comprises a plurality of warps and wefts, wherein a single weft is matched with a warp group consisting of at least two warps with different diameters, and the reticular capillary braiding structure is braided in a repeated and overlapping (staggered) mode in sequence, so that the reticular capillary braiding structure has pores with different sizes and the pore number is increased, so that the reticular capillary braiding structure can have better capillary force and poly (water-containing) characteristics, and the heat transfer efficiency is greatly improved.

Description

Reticular capillary knitting structure

Technical Field

The present utility model relates to a capillary structure, and more particularly, to a mesh-like capillary weave structure with improved capillary force and water-containing properties, thereby improving capillary heat transfer efficiency.

Background

With rapid progress in the technology 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 heat pipes or temperature equalizing plates, 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. 8, taiwan patent No. 201525398A discloses 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 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, 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 conventional weave-type capillary structure is simply woven by repeating and interlacing the first and second weave lines 51, 52, and 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 the increase of the (poly) water content and the lateral water absorption of the capillary structure area or part) is too much than the single (tuning) limitation;

therefore, the existing woven mesh capillary structure only provides pores and meshes with the same size and limited quantity for adsorbing the working liquid, 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 surface of the vapor phase plate is insufficient due to poor overall capillary force, and the problems of dry burning (dry-out) and reduced heat transfer efficiency are caused due to insufficient water content of the vapor surface of the vapor phase plate or water return passing surface and the like.

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 main object of the present utility model is to provide a mesh capillary weaving structure which is formed by weaving a warp yarn set consisting of a plurality of warp yarns with different thicknesses and numbers with a single weft yarn in a repeated and overlapped (staggered) mode in sequence, so as to have pores with different sizes and increase the number of pores, so that the mesh capillary weaving structure has better capillary force and poly (water) characteristics, and further improves the heat transfer efficiency.

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

the warp yarn group at least consists of two warp yarns with different wire diameters;

a weft thread;

the reticular capillary weaving structure is formed by weaving a warp yarn group with a single weft yarn in a repeated and overlapped mode in sequence in a first weaving direction and a second weaving direction.

The reticular capillary weaving structure comprises: each warp in the warp yarn group is of a different wire diameter.

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

The reticular capillary weaving structure comprises: the cross-sectional shape of at least one warp yarn in the warp yarn group is at least one circular cross-section.

The reticular capillary weaving structure comprises: the cross-sectional shape of at least one weft thread is circular or non-circular.

The reticular capillary weaving structure comprises: the warp and the weft are made of at least one of metal or nonmetal.

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

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

A reticular capillary 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 respectively knitted into the reticular capillary knitting structure in a mode of staggered in two directions and repeated overlapping in sequence, wherein:

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

The reticular capillary weaving 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 reticular capillary knitting structure can be applied to all knitting areas (areas) or partial knitting areas (areas) of the capillary net knitting structure by matching a single warp yarn group (consisting of a plurality of warp yarns with different thicknesses and numbers) with a single weft yarn to repeatedly knit in sequence, so that the reticular capillary knitting structure can increase the pores and the number of the pores with different sizes to form a compact and tough knitting structure, further 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 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 utility model;

FIG. 2 is a schematic top view of a mesh-type capillary woven structure according to the utility model;

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

FIGS. 4 and 5 are schematic top views of mesh-type capillary woven structures according to alternative embodiments of the present utility model;

FIG. 6 is a schematic side view of the present utility model from below in FIG. 2;

FIG. 7 is a schematic cross-sectional view of the reticulated capillary woven structure of the present utility model 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 mesh-like capillary weave structure 200; warp threads (first warp thread, second warp thread) 20, 20'; warp yarn group 2; a flow directing microchannel 201; a weft 30; a mesh 4; a heat source contact region 61; a peripheral region 62; pores t1, t1'; weft thread diameter P1; a first warp path P2; a second warp 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, 6 and 7. As shown in the drawing, the present utility model is a mesh-like capillary braid structure 200 disposed in a two-phase flow heat dissipating unit (may be a 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 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 mesh-like capillary weave 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 mesh-type capillary weaving 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 warp yarns 20, 20 'are selected as a warp yarn group 2 (the number of the warp yarn group may alternatively be more than two, three, four or other number of the warp yarns), the warp yarns 20, 20' in the warp yarn group 2 are arranged in a tight and tight manner with respect to each other in different wire diameters (thicknesses), so that each warp yarn group 2 of multiple groups is woven into the mesh capillary weaving structure 200 in a manner of alternately and sequentially overlapping each weft yarn 30 in a first weaving direction Y (such as a longitudinal direction) and in a second weaving direction X (such as a transverse direction).

In addition, under the same knitting area, the two first and second warp threads 20, 20' in each warp thread group 2 have first and second warp thread diameters P2, P3 with different thicknesses, the first warp thread diameter P2 is larger than the second warp thread diameter P3, both of which are smaller than the weft thread diameter P1 of the single weft thread 30, and the weft thread diameter P1 of the single weft thread 30 is larger than or equal to the sum of the first and second warp thread diameters P2, P3 of each warp thread group 2, so that the number of the first and second warp threads 20, 20' with different thicknesses is increased to construct the net-shaped capillary knitting structure 200 with holes (gaps) t1, t1' with more different sizes. Specifically, referring to fig. 2 and 6, each weft yarn 30 and at least two first warp yarns 20, 20 'with different thicknesses in each warp yarn group 2 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 different sizes are formed between the weft yarn 20 and the respective outer sides of each first warp yarn 20, 20 'with different thicknesses in each staggered position a, so that the number of the holes (gaps) t1, t1' (shown in fig. 6) with different sizes and the number of the holes (gaps) are increased. The first and second warp yarns 20, 20' of the adjacent warp yarn group 2 and the adjacent two weft yarns 30 are commonly surrounded and formed with meshes (meshes) 4.

In addition, the warp threads 20, 20 'of the warp thread group 2 of the present utility model have the first warp thread diameter P2 and the second warp thread diameter P3 with different thicknesses, the cross-sectional shapes thereof may be the same or non-same (as shown in fig. 6, the cross-sectional shape is a large circular cross-section, a small circular cross-section, or two non-circular cross-sections or any geometric cross-sections when seen from the left direction in fig. 2), and at least two flow guiding micro-channels 201 are formed between the first warp threads 20, 20' included in the warp thread group 2 and located above and below the contact point of the first warp threads 20, 20 '(as shown in fig. 6), and extend along the length direction of the first warp threads 20, 20'. The single weft 30 has a weft thread 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 warp yarns 20, 20' and the weft yarns 30 may be made of metal or nonmetal (such as plastic or stone) having certain toughness and good heat conductivity. That is, the warp yarns 20, 20' and the weft yarn 30 are co-applied using the same material (or using 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 mesh-type capillary woven structure 200 of the present utility model may be selected to be disposed on at least either the evaporation surface 111 or the condensation surface 112, and in this embodiment, the mesh-type capillary woven structure 200 may be selected to be 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 weft yarn 30 and the plurality of warp yarns 20 (20 '), the combination of the single weft yarn 30 and the plurality of weft yarns 20 (20') of the utility model, under the different application of the number proportion of the warp yarns 20 (20 ') and the weft yarns 30 and the wire diameter thickness, the reticular capillary weaving structure 200 can have more different small holes (gaps) t1 and t1', and the number of the holes (gaps) and the multi-diversion micro-channels 201 are increased to promote the reflux speed of the working fluid to the evaporation surface 111, and the directional guiding flow can be rapidly distributed on the evaporation surface 111, and has better poly (water) characteristics 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 mesh-like capillary weaving structure 200 can utilize a single weft 30 to match with holes (gaps) t1 and t1' formed by the weaving combination of a group of warp groups 2 in all woven areas (areas) or partial woven areas (areas), and can adjust the respective wire diameter sizes of the weft 30 and the first and second warp 20 and 20' in the warp groups 2 according to any or all requirements of poly (water) and capillary action to adjust the size of the holes (gaps), or adjust the distance between the first warp 20 and the second warp 20' and/or between the weft 30 and the warp 20', so as to adjust the density between the warp 20 (20 ') and the weft 30, thereby being more effectively applied to the heat dissipation requirements of various parts of the two-phase flow heat dissipation unit 100 (such as a temperature equalizing plate or a heat pipe) of different types.

Furthermore, the mesh-like capillary 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, the entire knitting area (area) of the mesh-like capillary knitting structure 200 according to the present embodiment can be a knitting mode or pattern of a single weft yarn 30 matched with a group of warp yarn groups 2 (a plurality of warp yarns 20, 20') with different thicknesses. However, in an alternative embodiment, referring to fig. 4 and 5, the mesh-type capillary weaving structure 200 may be woven by a single warp yarn and a single weft yarn, only the partial weaving area of the mesh-type capillary weaving structure 200 is selected to adopt the weaving mode of the present utility model by a single weft yarn 30 and a warp yarn set 2 (composed of a plurality of warp yarns 20, 20') with different thicknesses, while the rest portion is still woven by a common or conventional weaving mode. For example, the mesh-type capillary 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 (interlacing) manner, and the peripheral area 62 is knitted by a single weft yarn 30 and a set of warp yarn sets 2 of the same or different thickness in a repeated and overlapping (interlacing) 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 mesh-type capillary knitting 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-type capillary knitting 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-type capillary 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, thereby preventing the evaporation surface 111 from being dry-burned.

Of course, the present utility model can be used to match a single weft yarn 30 with a mesh-like capillary knitting structure 200 of a warp yarn set 2 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 (10)

1. A reticulated capillary braid structure for use in a two-phase flow heat dissipating unit comprising:

the warp yarn group at least consists of two warp yarns with different wire diameters;

a weft thread;

the reticular capillary weaving structure is formed by weaving a warp yarn group with a single weft yarn in a repeated and overlapped mode in sequence in a first weaving direction and a second weaving direction.

2. The reticulated capillary knit structure of claim 1, wherein: each warp in the warp yarn group is of a different wire diameter.

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

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

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

6. The reticulated capillary knit structure of claim 1, wherein: the warp and the weft are made of at least one of metal or nonmetal.

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

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

9. A reticular capillary 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 respectively knitted into the reticular capillary knitting structure in a mode of staggered in two directions and repeated overlapping in sequence, wherein:

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

10. The reticulated capillary woven 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.