Composite wick and ultrathin vapor chamber

Abstract

The utility model discloses a composite liquid absorbing core and an ultrathin vapor chamber. The composite liquid absorbing core comprises a plane silk screen and a plurality of spiral woven meshes, the plurality of spiral woven meshes are adjacently arranged and are averagely divided into a plurality of groups, and gaps are formed between each group of spiral woven meshes to form a steam channel; the planar silk screen comprises an upper-layer planar silk screen and a lower-layer planar silk screen; the top surfaces of the plurality of spiral woven meshes are compositely connected with the upper-layer plane silk screen, and the bottom surfaces are compositely connected with the lower-layer plane silk screen; the ultrathin vapor chamber comprises an upper shell, a lower shell and the composite wick. The upper shell is compositely connected with an upper-layer plane screen, and the lower shell is compositely connected with a lower-layer plane screen. The composite liquid absorption core is connected with the upper shell and the lower shell, a certain supporting effect is achieved, the structural design of a traditional supporting column is reduced, and then the thickness of the vapor chamber is reduced; the structural design of the large channel and the small channel can obtain better comprehensive capillary performance of the wick.

Description

Technical Field

[0001] This utility model belongs to the field of heat spreader technology, specifically relating to a composite liquid absorption core and an ultra-thin heat spreader. Background Technology

[0002] Most current vapor chambers employ a gas-liquid coplanar design, with their internal liquid wicks often consisting of support columns, making it difficult to further reduce the vapor chamber thickness. In gas-liquid coplanar vapor chambers, the flow directions of the liquid and gas phases may differ, leading to significant differences in their heat transfer properties. This can result in uneven fluid distribution within the vapor chamber, affecting heat exchange efficiency. Furthermore, the gas-liquid coplanar design may result in insufficient contact area between the gas and liquid, especially at low liquid flow rates. This can cause irregular gas distribution on the vapor chamber, affecting heat flow uniformity and overall performance. Vapor chambers with a gas-liquid coplanar design can further reduce thickness and exhibit superior performance with reduced overall thickness. Therefore, it is necessary to research and design the structure of gas-liquid coplanar vapor chambers. Utility Model Content

[0003] The main purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to propose a composite liquid absorption core and an ultra-thin heat spreader.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A composite absorbent core includes a planar wire mesh and multiple spiral woven meshes;

[0006] Multiple spiral woven meshes are arranged adjacently and divided into several groups on average. There are gaps between each group of spiral woven meshes to form steam channels.

[0007] Flat wire mesh includes an upper layer of flat wire mesh and a lower layer of flat wire mesh;

[0008] Multiple spiral woven meshes are compositely connected to the upper layer of planar wire mesh on the top surface and compositely connected to the lower layer of planar wire mesh on the bottom surface.

[0009] Spiral braided mesh is specifically made by interlacing copper wires in a spiral pattern to form a mesh material with a three-dimensional structure. There are gaps between the interlaced copper wires, which form small channels for liquid flow.

[0010] There is a gap between two adjacent spiral woven meshes, which forms a large channel with the upper and lower planar wire meshes.

[0011] Preferably, the width of the small channel is 50-100μm.

[0012] Preferably, the width of the large channel is 200-400μm.

[0013] Preferably, the width of the steam passage is 2-4 mm.

[0014] Preferably, the upper planar wire mesh is a single layer or multiple layers of planar wire mesh with a thickness of 0.04-0.1mm.

[0015] Preferably, the lower planar wire mesh is a single layer or multiple layers of planar wire mesh with a thickness of 0.04-0.1 mm.

[0016] This utility model also includes an ultra-thin heat spreader, comprising an upper shell, a lower shell, and a composite liquid absorption core provided by this utility model;

[0017] The upper shell is composite-connected to the upper planar wire mesh, and the lower shell is composite-connected to the lower planar wire mesh;

[0018] Grooves are provided on the connection surfaces of the upper and lower shells and the flat wire mesh.

[0019] Preferably, the groove depth is 0.05-0.3 mm.

[0020] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0021] 1. The large channels formed by the spiral woven mesh and the flat wire mesh of this utility model have high permeability, which can improve porosity, accommodate more liquid, and reduce liquid flow pressure drop. The small channels formed by the spiral interweaving of multiple copper wires have greater capillary force. The structural design of large and small channels can obtain better comprehensive capillary performance of the liquid-absorbing core.

[0022] 2. Due to its own structure, the spiral woven mesh of this utility model has a certain thickness and good mechanical properties, which can replace the support column to play a certain supporting role, reduce the traditional support column structure, and simplify the heat spreader structure and manufacturing process.

[0023] 3. In this utility model, multiple spiral woven meshes are arranged adjacently and divided into several groups on an average basis. Each group of spiral woven meshes is spaced with a certain width to serve as a steam channel. The heat spreader of this utility model has a gas-liquid co-surface structure design, which maximizes the thickness of the steam channel and can effectively reduce the steam flow resistance.

[0024] 4. The upper planar wire mesh of this utility model can prevent liquid from accumulating and blocking the steam channel, and can quickly absorb the liquid working medium returning from the condenser end, accelerate the gas-liquid phase change cycle, and thus improve the ultimate power of the heat spreader; the lower planar wire mesh can promote the rapid return of liquid to the evaporation end position, and prevent the liquid working medium at the evaporation end position from burning dry.

[0025] 5. The upper and lower shells of the heat spreader of this utility model are provided with microgrooves, which can obtain a larger surface area and enhance the contact and absorption efficiency of the liquid working fluid. When the heat source heats the surface of the heat spreader, the microgrooves accelerate the diffusion of heat locally, so that the heat is distributed more quickly to the entire surface of the heat spreader. The heat is more evenly distributed in all directions through the microgrooves, which helps to quickly transfer heat. The microgrooves have high permeability (low capillary force), and when combined with the planar wire mesh (high capillary force), they can give full play to their respective advantages, thereby improving the comprehensive capillary performance of the liquid wick and thus improving the overall performance of the heat spreader. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the composite liquid-absorbing core in the embodiment;

[0027] Figure 2 This is an exploded view of the composite liquid-absorbing core and the ultra-thin heat spreader in the embodiment;

[0028] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle;

[0029] Figure 4 This is a cross-sectional view of the ultrathin heat spreader in the embodiment;

[0030] Figure 5 yes Figure 4 A magnified view of a portion of point B in the middle;

[0031] Explanation of reference numerals: 1-Upper shell; 2-Upper flat wire mesh; 3-Spiral woven wire mesh; 4-Lower flat wire mesh; 5-Lower shell; 6-Groove; 7-Steam passage; 8-Large passage; 9-Small passage. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of the present invention is not limited thereto.

[0033] Example 1

[0034] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, a composite absorbent core includes a planar wire mesh and multiple spiral woven wire meshes 3;

[0035] Multiple spiral woven meshes are arranged adjacently and divided into several groups on average. There is a gap between each group of spiral woven meshes to form steam channels 7. The width of the steam channels is 2-4mm. In this embodiment, every 3 spiral woven meshes are divided into a group.

[0036] The flat wire mesh includes an upper flat wire mesh 2 and a lower flat wire mesh 4;

[0037] Multiple spiral woven meshes are compositely connected to the upper layer of planar wire mesh on the top surface and to the lower layer of planar wire mesh on the bottom surface.

[0038] In this embodiment, the spiral braided mesh is formed by interlacing copper wires in a spiral shape to create a mesh material with a three-dimensional structure. There are gaps between the interlaced copper wires to form small channels 9 for liquid flow. The width of the small channels is 50-100μm.

[0039] In this embodiment, a gap is provided between two adjacent spiral woven meshes, and this gap, together with the upper and lower planar wire meshes, forms a large channel 8 with a width of 200-400μm.

[0040] In this embodiment, the upper planar wire mesh is specifically a single-layer planar wire mesh of 200 mesh (other mesh numbers such as 300 mesh are also acceptable) (single or multiple layers are acceptable), with a thickness of 0.1 mm (0.04-0.1 mm are acceptable); the lower planar wire mesh is specifically a single-layer planar wire mesh of 200 mesh (other mesh numbers such as 300 mesh are also acceptable) (single or multiple layers are acceptable), with a thickness of 0.1 mm (0.04-0.1 mm are acceptable).

[0041] Example 2

[0042] like Figure 2 As shown, this embodiment provides an ultrathin heat spreader, including an upper shell 1, a lower shell 5, and the composite liquid-absorbing core described in Embodiment 1; the upper shell is compositely connected to an upper planar wire mesh, and the lower shell is compositely connected to a lower planar wire mesh. Figure 3 As shown, grooves 6 are provided on the connection surfaces of the upper and lower shells and the planar wire mesh; in this embodiment, the groove depth is 0.05-0.3mm.

[0043] When the heat exchanger of this utility model is in use, the liquid working fluid condensed at the condensing end of the upper shell is quickly absorbed by the upper planar wire mesh. The absorbed liquid working fluid is transported back to the evaporation end of the ultra-thin heat exchanger through the large and small channels of the composite liquid absorption core. The evaporation end of the lower shell is heated, the liquid working fluid vaporizes, and returns to the condensing end along the steam channel.

[0044] For the composite liquid-absorbing core and ultra-thin heat spreader of this invention, the spiral braided mesh, due to its structure, has a certain thickness and good mechanical properties, and can replace the support column to play a certain supporting role, reducing the need for traditional support column structures; the upper planar mesh can prevent liquid from accumulating and clogging in the vapor channel, and can quickly absorb the liquid working fluid returning from the condenser end, accelerating the gas-liquid phase change cycle and thus improving the ultimate power of the heat spreader; the lower planar mesh can promote the rapid return of liquid to the evaporation end, preventing the liquid working fluid at the evaporation end from drying out; the vapor channel can reduce the vapor resistance in the gas-liquid phase change cycle and improve the ultimate power of the ultra-thin heat spreader; the large channel formed by the spiral braided mesh and the planar mesh has high permeability, which can increase porosity, accommodate more liquid, and reduce liquid accumulation. The flow pressure drop and the small channels formed by the spiral interweaving of multiple copper wires result in greater capillary force. The structural design of large and small channels achieves better overall capillary performance of the wick. The upper and lower shells of the heat spreader have microgrooves, which can obtain a larger surface area and enhance the contact and absorption efficiency of the liquid working fluid. When the heat source heats the surface of the heat spreader, the microgrooves accelerate the diffusion of heat locally, allowing the heat to be distributed more quickly to the entire surface of the heat spreader. The heat is more evenly distributed in all directions through the microgrooves, which helps to quickly transfer heat. The microgrooves have high permeability (low capillary force), and when combined with the planar wire mesh (high capillary force), they can leverage their respective advantages to improve the overall capillary performance of the wick and thus enhance the overall performance of the heat spreader.

[0045] It should also be noted that, in this specification, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0046] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A composite liquid-absorbing core, characterized in that, Includes flat wire mesh and multiple spiral woven wire mesh; Multiple spiral woven meshes are arranged adjacently and divided into several groups on average. There are gaps between each group of spiral woven meshes to form steam channels. Flat wire mesh includes an upper layer of flat wire mesh and a lower layer of flat wire mesh; Multiple spiral woven meshes are compositely connected to the upper layer of planar wire mesh on the top surface and compositely connected to the lower layer of planar wire mesh on the bottom surface. Spiral braided mesh is specifically made by interlacing copper wires in a spiral pattern to form a mesh material with a three-dimensional structure. There are gaps between the interlaced copper wires, which form small channels for liquid flow. There is a gap between two adjacent spiral woven meshes, which forms a large channel with the upper and lower planar wire meshes.

2. The composite absorbent core according to claim 1, characterized in that, The width of the small channel is 50-100μm.

3. The composite absorbent core according to claim 1, characterized in that, The width of the large channel is 200-400μm.

4. A composite absorbent core according to claim 1, characterized in that, The width of the steam passage is 2-4mm.

5. A composite absorbent core according to claim 1, characterized in that, The upper layer of flat wire mesh is specifically a single layer or multiple layers of flat wire mesh with a thickness of 0.04-0.1mm.

6. A composite absorbent core according to claim 1, characterized in that, The lower layer of flat wire mesh is specifically a single layer or multiple layers of flat wire mesh with a thickness of 0.04-0.1mm.

7. An ultrathin heat spreader, characterized in that, Includes an upper shell, a lower shell, and the composite liquid-absorbing core as described in any one of claims 1-6; The upper shell is composite-connected to the upper planar wire mesh, and the lower shell is composite-connected to the lower planar wire mesh; Grooves are provided on the connection surfaces of the upper and lower shells and the flat wire mesh.

8. The ultrathin heat spreader according to claim 7, characterized in that, The trench depth is 0.05-0.3mm.

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