Patent Application
20240393057
The present invention relates generally to a capillary structure, and more particularly to a mesh woven structure with capillary action. The mesh woven structure has better capillary attraction and water collection (containing) ability to enhance the capillary heat transfer performance.
Along with the rapid advance of technologic and scientific industries, currently, many 3C electronic products are designed with lightweight, thin, short and small size. Under such circumstance, the heat dissipation unit disposed in the electronic product for dissipating or conducting the heat must be thinned in accordance with the thin electronic product. In this case, the heat dissipation unit employing transformation between two phases of a working fluid, such as a heat pipe or a vapor chamber, has been stressed. However, the heat conductivity of the two-phase fluid heat dissipation unit is mostly determined by the capillary structure.
Please refer to
However, the aforesaid conventional woven mesh capillary structure is simply composed of the first weaving lines 51 and the second weaving lines 52, which repeatedly intersect each other and are woven with each other. The first and second weaving lines 51, 52 have the same diameter (thickness). Therefore, after the first and second weaving lines 51, 52 longitudinally and latitudinally intersect (and overlap with) each other and are woven with each other, multiple voids with the same fixed size are formed in the woven mesh capillary structure. In addition, the number of the voids and the number of the meshes of the woven mesh capillary structure are fixed and limited. As a result, the application of the capillary attraction of the woven mesh capillary structure, (such as the enhancement of the water containing (collection) ability and the transverse water absorption ability of the entire woven mesh capillary structure or a local section of the woven mesh capillary structure), is too monotonous so that the woven mesh capillary structure cannot be flexibly utilized.
Therefore, the conventional woven mesh capillary structure can simply provide a limited number of voids and a limited number of meshes with the same size for absorbing the working fluid. In this case, the conventional woven mesh capillary structure cannot be freely designed in accordance with the type of the two-phase fluid heat dissipation unit to satisfy different heat dissipation requirements of the respective sections of the two-phase fluid heat dissipation unit. Therefore, the water containing ability of the woven mesh capillary structure is insufficient and the capillary attraction of the entire woven mesh capillary structure is poor. As a result, the two-phase fluid heat dissipation unit employing the woven mesh capillary structure cannot be flexibly utilized so that the backflowing is too slow and the water content of the evaporation face of the two-phase fluid heat dissipation unit is insufficient. Consequently, dry-out may take place on the evaporation face to lower the heat transfer performance.
It is therefore tried by the applicant to provide a mesh woven structure with capillary action, which has better capillary attraction and water containing ability to solve the problems of the conventional woven mesh capillary structure disposed in the heat dissipation unit.
It is therefore a primary object of the present invention to provide a mesh woven structure with capillary action. The mesh woven structure includes multiple latitudinal lines and multiple longitudinal line sets each having multiple longitudinal lines with the same thickness. The mesh woven structure is woven from the multiple latitudinal lines and multiple cooperative longitudinal line sets, which sequentially repeatedly intersect and overlap with each other. Accordingly, the number of the voids of the mesh woven structure is increased so that the mesh woven structure has better capillary attraction and water collection (containing) ability to enhance the heat transfer performance.
To achieve the above and other objects, the mesh woven structure with capillary action of the present invention is applied to and disposed in a two-phase fluid heat dissipation unit. The mesh woven structure includes multiple latitudinal lines and multiple longitudinal line sets (each having at least two longitudinal lines). The multiple longitudinal line sets extend in a first weaving direction, while the multiple latitudinal lines extend in a second weaving direction. The multiple longitudinal line sets and the multiple latitudinal lines sequentially repeatedly intersect (and overlap with) each other and are woven and collocated with each other to form the mesh woven structure.
The entire weaving area of the mesh woven structure or a local weaving section of the mesh woven structure of the present invention is woven from the multiple latitudinal lines and the multiple cooperative longitudinal line sets, which sequentially repeatedly intersect and overlap with each other. Therefore, the number of the voids of the mesh woven structure is increased so that the mesh woven structure has better capillary attraction and water collection (containing) ability to enhance the capillary action. Moreover, the mesh woven structure can effectively directionally guide the working fluid and fully spread the working fluid (to quickly flow back). Accordingly, the water collection (containing) ability of the evaporation face of the two-phase fluid heat dissipation unit is enhanced to avoid dry-out and promote the heat exchange efficiency.
Each of the latitudinal lines is repetitively woven over and under the longitudinal line sets, while the adjacent latitudinal lines that interlace with the same longitudinal line set have opposite weaving directions, causing the crests of all adjacent latitudinal lines to be arranged in an alternating up-and-down pattern.
The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein:
Please refer to
The mesh woven structure 200 includes multiple longitudinal lines 20 and multiple latitudinal lines 30. In this embodiment, as shown in
In addition, in the same weaving area, the sum of the diameters P1 of the longitudinal lines 20 of each longitudinal line set 2 is smaller than or equal to the diameter P2 of one single latitudinal line 30. Therefore, the number of the longitudinal lines 20 is increased to define more voids t1 in the mesh woven structure 200. Please refer to
Therefore, in all of or a local section of the mesh woven structure 200 of the present invention, the latitudinal lines 30 and the longitudinal line sets 2 are cooperatively woven with each other to form the mesh woven structure 200. Accordingly, the mesh woven structure 200 has more voids t1 and thus better water collection (containing) property so as to achieve better capillary action. Therefore, the capillary attraction of the mesh woven structure 200 is enhanced to provide higher heat dissipation efficiency. In practice, in accordance with the type of the two-phase fluid heat dissipation unit 100 (such as vapor chamber or heat pipe) and/or the position where a heat source is positioned, which requires higher water collection (containing) ability and better capillary action, all of or a part (a local section) of the mesh woven structure 200 can be such designed that the single latitudinal line 30 and one longitudinal line set 2 (having multiple longitudinal lines 20 with the same thickness) are cooperatively woven with each other. In addition, the intervals between the longitudinal line 20 and the longitudinal line 20 and/or the latitudinal line 30 and the latitudinal line 30 are adjustable so as to adjust the density of the longitudinal lines 20 and the latitudinal lines 30. Accordingly, the number of the longitudinal lines 20 and the number of the cooperative latitudinal lines 30 can be flexibly varied for different applications. Therefore, the flow guiding (backflowing) and water collection (containing) ability and the capillary action of all of or a local section of the mesh woven structure 200 can be adjusted, whereby the woven mesh structure 200 can be more effectively applied to various two-phase fluid heat dissipation units 100 to satisfy the heat dissipation requirements of the respective sections of the two-phase fluid heat dissipation units 100.
The single latitudinal line 30 of the present invention can have a circular cross section (as shown in
The configurations of the cross sections of the multiple longitudinal lines 20 of the latitudinal line set 2 can be identical to each other or different from each other (as shown in
Furthermore, the longitudinal lines 20 and the latitudinal lines 30 can be made of metal or nonmetal materials (plastic or stone materials). That is, the longitudinal lines 20 and the latitudinal lines 30 can be made of the same material (or different materials collocated with each other).
Further referring to
In the mesh woven structure 200 of the present invention, the number of the latitudinal lines 30 is different from and in a certain proportion to the number of the longitudinal lines 20 of the cooperative longitudinal line sets 2. Therefore, the mesh woven structure 200 has more voids t1 and more flow-guiding micro-passages 301 for speeding the backflowing of the working fluid from the condensation face 112 to the evaporation face 111. In addition, the voids t1 and the flow-guiding micro-passages 301 of the mesh woven structure 200 serve to directionally guide the working fluid to quickly spread over the evaporation face 111, whereby the evaporation face 111 has better water collection (containing) ability to avoid dry-out. Accordingly, the rate of boiling and evaporation of the working fluid on the evaporation face 111 in response to the temperature is enhanced. Moreover, not only the condensed working fluid quickly continuously flows from the condensation face 112 back to the evaporation face 111 to avoid dry-out, but also the circular transformation between the liquid phase and the vapor phase of the working fluid in the chamber 110 is effectively speeded to enhance the heat dissipation performance.
Accordingly, the entire weaving area of the mesh woven structure 200 of the present invention is, but not limited to, formed of the single latitudinal line 30 and one longitudinal line set 2 (having multiple longitudinal lines 20 with the same thickness) collocated and woven with each other. Alternatively, in a modified embodiment, only a local section of the mesh woven structure 200 is formed of the single latitudinal line 30 and one longitudinal line set 2 (having multiple longitudinal lines 20 with the same thickness) collocated and woven with each other, while the remaining section of the mesh woven structure 200 is conventionally formed of the single longitudinal line 20 and the single latitudinal line 30 collocated and woven with each other. For example, the mesh woven structure 200 has a heat source contact section corresponding to a heat source and a peripheral section around the heat source contact section. The heat source contact section is positioned at a center of the mesh woven structure 200 and is conventionally woven from the single longitudinal line 20 and the single latitudinal line 30, which sequentially repeatedly intersect (and overlap with) each other, while the peripheral section is woven from the single latitudinal line 30 and one longitudinal line set 2, which sequentially repeatedly intersect (and overlap with) each other. To speak more specifically, the heat source contact section of the mesh woven structure 200 is disposed in the chamber 110 of the two-phase fluid heat dissipation unit 100 corresponding to the evaporation face 111 in contact with the heat source. After the liquid working fluid contained in the heat source contact section of the mesh woven structure 200 is heated, the liquid working fluid is quickly evaporated into the vapor working fluid. The peripheral section of the mesh woven structure 200 has greater capillary attraction and better water collection (containing) ability so that the condensed working fluid can more quickly flow back to the peripheral section around the heat source contact section. Accordingly, the liquid working fluid can be collected and contained in the peripheral section and supplied to the heat source contact section at a proper time to avoid dry-out of the evaporation face 111.
Alternatively, as necessary, any of the heat source contact section and the peripheral section of the mesh woven structure 200 of the present invention can be formed of the single latitudinal line 30 and one longitudinal line set 2 collocated and woven with each other.
In conclusion, the mesh woven structure 200 of the present invention is woven from the single latitudinal line 30 and one longitudinal line set 2 having at least two longitudinal lines 20, which sequentially repeatedly intersect (and overlap with) each other. In a fixed weaving area of the mesh woven structure 200, the number of the voids is greatly increased. Moreover, the number of the longitudinal lines 20 and the number of the cooperative latitudinal lines 30 are flexibly variable, whereby the mesh woven structure 200 can have more flow-guiding micro-passages 301. Accordingly, the mesh woven structure 200 can directionally guide the working fluid to quickly spread and flow. Moreover, the mesh woven structure 200 has excellent water collection (containing) ability and better capillary action to enhance the heat exchange efficiency.
The present invention has been described with the above embodiments thereof and it is understood that many changes and modifications in such as the form or layout pattern or practicing step of the above embodiments can be carried out without departing from the scope and the spirit of the invention that is intended to be limited only by the appended claims.
