Heat plate and heat sink

Abstract

The embodiment of the application provides a vapor chamber and a radiator, and relates to the technical field of the radiator. The vapor chamber comprises a first shell and a second shell, a sealed cavity is arranged between the first shell and the second shell, and a capillary core structure is arranged in the sealed cavity. The capillary core structure comprises a metal wire mesh layer and a woven belt layer, and the metal wire mesh layer and the woven belt layer are connected in a horizontal-vertical composite mode to improve the heat dissipation capacity of the vapor chamber. Through one of the embodiments of the application, the problem that the vapor chamber in the related art is difficult to meet the higher heat dissipation requirement of a base station and other equipment is solved, and the effect of improving the heat dissipation efficiency of the equipment is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat sinks, and more specifically, to a heat spreader and a heat sink. Background Technology

[0002] Driven by the demand for weight reduction and cost reduction in 5G, 6G, ..., nG base station equipment, lightweight vapor chamber heat sinks have gradually become a powerful alternative to traditional copper-based vapor chamber heat sinks. However, the current temperature uniformity performance of vapor chambers is relatively weak, making it difficult to meet the more efficient heat dissipation requirements of base station equipment. Summary of the Invention

[0003] This invention provides a heat spreader and a heat sink, which at least solves the problem that heat spreaders in related technologies are difficult to meet the more efficient heat dissipation requirements of equipment such as base stations.

[0004] According to one embodiment of the present invention, a heat spreader is provided, comprising: a first housing and a second housing, wherein a sealed cavity is provided between the first housing and the second housing, and a capillary wick structure is provided within the sealed cavity; wherein the capillary wick structure comprises a metal mesh layer and a braided tape layer, and the metal mesh layer and the braided tape layer are connected in a horizontal and vertical composite manner to improve the heat dissipation capacity of the heat spreader.

[0005] According to another embodiment of the present invention, a heat sink is provided, comprising a heat spreader as described in any of the above.

[0006] Through one of the above embodiments of the present invention, a novel capillary wick structure is employed within the heat spreader. This capillary wick structure enables rapid diversion of the working fluid within the sealed cavity to the heat source, improving the circulation efficiency of the working fluid and consequently enhancing the heat dissipation efficiency of the heat source. Therefore, the problem that heat spreaders in related technologies often fail to meet the more efficient heat dissipation requirements of equipment such as base stations can be solved, achieving the effect of improving the heat dissipation efficiency of the equipment. Attached Figure Description

[0007] Figure 1 This is a cross-sectional view of a heat spreader according to an embodiment of the present invention;

[0008] Figure 2 This is an exploded view of a heat spreader according to an embodiment of the present invention;

[0009] Figure 3 This is a schematic diagram of the overall structure of the heat spreader according to an embodiment of the present invention;

[0010] Figure 4 This is a schematic diagram of the structure of the woven tape layer and the metal mesh layer according to an embodiment of the present invention;

[0011] Figure 5 According to an embodiment of the present invention Figure 4A magnified view of a portion of point A in the middle.

[0012] Explanation of reference numerals in the attached drawings: 1. First housing; 2. Second housing; 3. Sealed cavity; 4. Capillary core structure; 41. Metal wire mesh layer; 42. Braided tape layer; 421. Braided tape; 5. Heat source; 6. Support column; 7. Relief hole; 8. Injection hole; 9. Injection tube. Detailed Implementation

[0013] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples.

[0014] It should be noted that the terms "first," "second," etc., in the specification, claims, and drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0015] This embodiment provides a heat spreader. Figure 1 This is a cross-sectional view of a heat spreader according to an embodiment of the present invention, such as... Figure 1 As shown, the heat spreader includes: a first shell 1 and a second shell 2, a sealed cavity 3 is provided between the first shell 1 and the second shell 2, and a capillary wick structure 4 is provided inside the sealed cavity 3;

[0016] In one exemplary implementation, Figure 2 This is an exploded view of a heat spreader according to an embodiment of the present invention, such as... Figure 2 As shown, the capillary wick structure 4 is located in the sealed cavity 3 between the first housing 1 and the second housing 2. It is used to move the gaseous working fluid away from the heat source 5 and to move the liquid working fluid towards the heat source 5, so that the working fluid circulates in the sealed cavity 3 to transfer energy to the heat source 5.

[0017] In one exemplary embodiment, for example, the sealing cavity 3 can be formed by pressing the first housing 1 into a concave cavity, thereby fixing and sealing the edges of the first housing 1 and the second housing 2. Alternatively, the sealing cavity 3 can also be formed by pressing the second housing 2 into a concave cavity, thereby fixing and sealing the edges of the first housing 1 and the second housing 2 (e.g.) Figure 2 (As shown). The first housing 1 is further provided with a liquid injection hole 8, or the second housing 2 is provided with a liquid injection hole 8 (as shown). Figure 2 (As shown). The injection hole 8 is connected to the injection pipe 9 and is used for vacuum injection and sealing. The injection hole 8 can be die-cast from either the first housing 1 or the second housing 2.

[0018] The capillary core structure 4 includes a metal mesh layer 41 and a braided tape layer 42. The metal mesh layer 41 and the braided tape layer 42 are connected in a horizontal and vertical composite manner to improve the heat dissipation capacity of the heat spreader.

[0019] In one exemplary implementation, Figure 3 This is a schematic diagram of the overall structure of the heat spreader according to an embodiment of the present invention, as shown below. Figure 3 As shown, for example, the first housing 1 is the upper housing, the second housing 2 is the lower housing, and the heat source 5 is located on the side closer to the second housing 2. Figure 1 As shown, for example, the horizontal direction can be the vertical direction, and the vertical direction can be the horizontal direction. Both the wire mesh layer 41 and the braided tape layer 42 are located within the sealed cavity 3. Therefore, the wire mesh layer 41 is mainly used to guide the working fluid to the heat source 5 in the vertical direction, but it can also guide the working fluid to the heat source 5 in the horizontal direction. The braided tape layer 42 is mainly used to guide the working fluid to the heat source 5 in the horizontal direction, but it can also guide the working fluid to the heat source 5 in the vertical direction. Of course, the above positional relationship is only illustrative; it is also conceivable that one end of the braided tape layer 42 is located away from the heat source 5, and the other end extends through the wire mesh layer 41 to the side of the heat source 5. Therefore, using a combined horizontal and vertical connection method for the wire mesh layer 41 and the braided tape layer 42 improves the circulation efficiency of the working fluid, thereby further enhancing the heat dissipation capacity of the heat spreader.

[0020] By adopting the above technical solution, a novel capillary wick structure 4 is used within the heat spreader. This capillary wick structure 4 can rapidly guide the working fluid within the sealed cavity 3 to the heat source 5, improving the circulation efficiency of the working fluid and thus enhancing the heat dissipation efficiency of the heat source 5. Therefore, it solves the problem that heat spreaders in related technologies cannot meet the more efficient heat dissipation requirements of equipment such as base stations, achieving the effect of improving the heat dissipation efficiency of the equipment.

[0021] In one embodiment, the braided tape layer 42 is in contact with the metal mesh layer 41, with the braided tape layer 42 located on the side closer to the heat source 5 and the metal mesh layer 41 located on the side of the braided tape layer 42 away from the heat source 5.

[0022] In one exemplary implementation, Figure 4 This is a schematic diagram of the structure of the woven tape layer 42 and the metal mesh layer 41 according to an embodiment of the present invention, as shown below. Figure 1 and Figure 4 As shown, both the wire mesh layer 41 and the braided tape layer 42 are located within the sealed cavity 3. The wire mesh layer 41 is positioned away from the heat source 5, while the braided tape layer 42 is positioned close to the heat source 5. Therefore, the wire mesh layer 41 can guide the working fluid from the side away from the heat source 5 to the side close to the heat source 5 based on capillary force. Since the braided tape layer 42 is in contact with the wire mesh layer 41, it can further guide the working fluid drawn from the wire mesh layer 41 to the heat source 5. Moreover, the braided tape layer 42 can also guide the working fluid around the heat source 5 to the heat source 5 in the horizontal direction based on capillary force. Therefore, the working fluid can be combined with the heat source 5 in both the vertical and horizontal directions based on the wire mesh layer 41 and the braided tape layer 42.

[0023] In one embodiment, the braided tape layer 42 includes a braided tape 421; wherein, in the plane of the braided tape layer 42, the extension direction of the braided tape 421 passes through the heat source 5.

[0024] In one exemplary implementation, Figure 5 According to an embodiment of the present invention Figure 4 A magnified view of a portion of point A, as shown below. Figure 5 As shown, each braided strip 421 can be made of metal fibers woven in warp and weft. The braided strip layer 42 is located on the side closest to the heat source 5, and the braided strip layer 42 includes multiple braided strips 421 extending in the horizontal direction of the braided strip layer 42. For example, the braided strips 421 extend from the left side to the right side of the second housing 2 (e.g., Figure 4 and Figure 5 (As shown), the working fluid can extend from the upper side to the lower side of the second housing 2. Alternatively, if the heat source 5 is located at the center of the second housing 2, the center of the second housing 2 can be the same end point of multiple braided strips 421, with the other end points of the multiple braided strips 421 extending away from the heat source 5. Or, if the heat source 5 is located at the center of the second housing 2, the multiple braided strips 421 may extend in different directions, but all of them pass through the heat source 5. By adopting the above technical solutions, it is beneficial to quickly guide the working fluid around the heat source 5 to the heat source 5, or to transfer the vaporized working fluid away from the heat source 5.

[0025] In one embodiment, the capillary force of the braided tape layer 42 is greater than that of the metal mesh layer 41.

[0026] In one embodiment, the metal mesh layer 41 includes multiple layers of metal mesh; wherein the mesh count of the first metal mesh is greater than that of the second metal mesh, the first metal mesh is disposed close to the heat source 5, and the second metal mesh is disposed away from the heat source 5.

[0027] In one exemplary embodiment, for example, the first metal wire mesh can be a metal wire mesh closer to the heat source 5. The larger the mesh count, the smaller the aperture of the mesh. When the working fluid comes into contact with the heat source 5 and the heat is transferred, it is evaporated into a gaseous state. The small aperture of the first metal wire mesh facilitates the boiling and nucleation of the working fluid. For example, the second metal wire mesh can be a metal wire mesh farther from the heat source 5. The smaller the mesh count, the larger the aperture of the mesh. When the gaseous working fluid moves to the side farther from the heat source 5 and condenses into a liquid state, the large aperture of the second metal wire mesh facilitates the collection of the liquid working fluid towards the side closer to the heat source 5. Further, the first metal wire mesh can be the metal wire mesh closest to the heat source 5. The small aperture is beneficial for the boiling and nucleation of the working fluid at the heat source 5. The second metal wire mesh can be the outermost metal wire mesh farther from the heat source 5. The large aperture is beneficial for collecting the liquid working fluid and guiding the working fluid to the side of the heat source 5. Among them, the multi-layer metal wire mesh can be connected by contact with each other, or it can be connected into a whole structure by vacuum welding.

[0028] In one embodiment, the mesh count of the multilayer metal wire mesh decreases layer by layer in the direction from the heat source 5 to away from the heat source 5.

[0029] In one exemplary embodiment, the mesh size of the metal mesh closest to the heat source 5 is the smallest, facilitating the boiling and nucleation of the working fluid. In the direction from the heat source 5 away from it, the mesh size of adjacent metal meshes gradually increases, which is beneficial for the boiling and nucleating working fluid to form bubbles and rapidly move the gaseous working fluid away from the heat source 5. Conversely, the mesh size of the metal mesh furthest from the heat source 5 is the largest, facilitating the rapid collection of liquid working fluid. In the direction closer to the heat source 5, the mesh size of adjacent metal meshes gradually decreases, facilitating the diversion of liquid working fluid towards the heat source 5.

[0030] In one embodiment, the working medium is pure water; the surfaces of the first housing 1 and the second housing 2 located inside the sealed cavity 3 are provided with metal coatings for isolating the pure water working medium, and the metal coatings are also provided on the surfaces of the metal mesh layer 41 and the braided tape layer 42.

[0031] In one exemplary embodiment, pure water as the working medium has many advantages, such as high latent heat of vaporization, non-toxicity, and low price. Therefore, the latent heat of vaporization of pure water is much higher than that of conventional working media, which significantly improves the heat dissipation capacity and temperature uniformity of the heat spreader. Secondly, the materials of the first shell 1 and the second shell 2 in this embodiment can be one or more of copper, titanium, aluminum, etc. The following explanation uses aluminum as the base material of the first shell 1 and the second shell 2 as an example. Since water and aluminum are incompatible, they easily react at high temperatures to generate non-condensable gases, hindering the vapor-liquid circulation inside the sealed cavity 3 and causing the heat spreader to fail. Therefore, using a metal coating helps to prevent the pure water working medium from reacting with the first shell 1, the second shell 2, the metal mesh layer 41, and the braided tape layer 42, thereby allowing for a wider range of material choices for the first shell 1, the second shell 2, the metal mesh layer 41, and the braided tape layer 42, improving the adaptability and scalability of the heat spreader.

[0032] In one embodiment, a metal plating layer is also provided at the connection between the first housing 1 and the second housing 2, so as to weld the first housing 1 and the second housing 2 based on the metal plating layer.

[0033] In one exemplary embodiment, the metal plating allows the first housing 1 and the second housing 2 to be directly soldered using solder paste, saving costs compared to the vacuum brazing method using a heat spreader in related technologies. The metal plating material can be a corrosion-resistant, oxidation-resistant, and high-hardness metal, including but not limited to nickel, chromium, and cobalt.

[0034] In one embodiment, a support column 6 is provided on the side wall of the first housing 1 located in the sealed cavity 3 or the side wall of the second housing 2 located in the sealed cavity 3. The metal wire mesh layer 41 and the braided tape layer 42 are provided with relief holes 7. One end of the support column 6 passes through the relief hole 7 and is connected to the side wall of the second housing 2 located in the sealed cavity 3 or the side wall of the first housing 1 located in the sealed cavity 3. The surface of the support column 6 and the hole wall of the relief hole 7 are both provided with a metal plating layer.

[0035] In one exemplary implementation, such as Figure 2As shown, the number of support columns 6 corresponds to the number of clearance holes 7, allowing the support columns 6 to extend from the first housing 1 to the second housing 2, or from the second housing 2 to the first housing 1, thus supporting the first housing 1 and the second housing 2. Multiple support columns 6 can be evenly arranged within the sealing cavity 3 to ensure uniform stress on the first housing 1 and the second housing 2, reducing the probability of deformation and protecting the sealing cavity 3. One end of each support column 6 can be fixedly connected to the first housing 1, and the other end can pass through the clearance hole 7 and be fixedly connected to the second housing 2. Alternatively, one end of the support column 6 can be fixedly connected to the first housing 1, and the other end can pass through the clearance hole 7 and abut against the second housing 2. Or, one end of the support column 6 can be fixedly connected to the second housing 2, and the other end can pass through the clearance hole 7 and abut against the first housing 1. The support columns 6 can be integrally formed with the first housing 1 or the second housing 2. For example... Figure 2 As shown, the aforementioned sidewall can be the bottom wall of the first housing 1 and the second housing 2 within the sealed cavity 3, i.e., the largest sidewall facing the first housing 1 and the second housing 2. Alternatively, the aforementioned sidewall can also be the side edge of the first housing 1 and the second housing 2, i.e., the enclosure connected to the bottom wall. Therefore, since the support column 6 is provided within the sealed cavity 3, when the first housing 1 and the second housing 2 are subjected to external forces, the support column 6 can provide support or tension to the first housing 1 and the second housing 2, thereby reducing the probability of deformation of the first housing 1 and the second housing 2.

[0036] In one embodiment, the metal coatings on the surfaces of the wire mesh layer 41 and the braided tape layer 42 are configured as synaptic particle structures to allow the liquid pure water working fluid to spread on the surface of the metal coatings.

[0037] In one exemplary embodiment, the surface of the treated metal coating has a synaptic particle structure and is uneven, making the metal coating a hydrophilic structure. This allows the liquid working fluid to remain and spread on the surface of the metal coating, so that the working fluid can be quickly returned to the heat source 5 by combining the capillary force of the metal mesh layer 41 and the braided tape layer 42.

[0038] In one embodiment, the size of the synaptic particle structure is at the micro / nano scale.

[0039] In one exemplary embodiment, the synaptic particle structure is micro / nanoscale in size, which is small enough to be combined with the pores of the metal mesh and the braided strip 421 to form a multi-scale micro / nanoscale composite liquid-absorbing core, thereby further improving the capillary force of the capillary core structure 4.

[0040] This embodiment also provides a heat sink, including a heat spreader as described above.

[0041] In summary, compared to the use of acetone, alcohol, or refrigerants in related technologies, this embodiment uses pure water as the working fluid, which greatly improves heat dissipation capacity. Furthermore, the capillary wick structure 4 in this embodiment improves the circulation efficiency of the pure water working fluid, further enhancing heat dissipation. Secondly, using aluminum as the base material for the first housing 1, the second housing 2, and the support column 6 makes the heat spreader or radiator of this embodiment lighter and less expensive.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A heat spreader, characterized in that, include: A first housing (1) and a second housing (2) are provided, and a sealed cavity (3) is provided between the first housing (1) and the second housing (2). A capillary core structure (4) is provided inside the sealed cavity (3). The capillary core structure (4) includes a metal mesh layer (41) and a braided tape layer (42). The metal mesh layer (41) and the braided tape layer (42) are connected in a horizontal and vertical composite manner to improve the heat dissipation capacity of the heat exchange plate.

2. The heat spreader according to claim 1, characterized in that, The braided tape layer (42) is in contact with the metal mesh layer (41), the braided tape layer (42) is located on the side closer to the heat source (5), and the metal mesh layer (41) is located on the side of the braided tape layer (42) away from the heat source (5).

3. The heat spreader according to claim 1, characterized in that, The capillary force of the woven tape layer (42) is greater than that of the metal wire mesh layer (41).

4. The heat spreader according to claim 1, characterized in that, The metal mesh layer (41) includes multiple layers of metal mesh; wherein the mesh count of the first metal mesh is greater than that of the second metal mesh, the first metal mesh is located close to the heat source (5), and the second metal mesh is located away from the heat source (5).

5. The heat spreader according to claim 4, characterized in that, The mesh count of the multilayer metal wire mesh decreases layer by layer in the direction from the heat source (5) to away from the heat source (5).

6. The heat spreader according to claim 1, characterized in that, The braided tape layer (42) includes a braided tape (421); wherein, in the plane of the braided tape layer (42), the extension direction of the braided tape (421) passes through the heat source (5).

7. The heat spreader according to claim 1, characterized in that, The working medium is pure water; the surface of the first housing (1) located inside the sealed cavity (3) and the surface of the second housing (2) located inside the sealed cavity (3) are both provided with a metal coating for isolating the pure water working medium, and the metal coating is also provided on the surface of the metal mesh layer (41) and the surface of the braided tape layer (42).

8. The heat spreader according to claim 7, characterized in that, The metal plating is also disposed at the connection between the first housing (1) and the second housing (2) to weld the first housing (1) and the second housing (2) based on the metal plating.

9. The heat spreader according to claim 7, characterized in that, The metal coatings on the surfaces of the metal mesh layer (41) and the braided tape layer (42) are configured as synaptic particle structures to allow the liquid pure water working fluid to spread on the surface of the metal coatings.

10. The heat spreader according to claim 9, characterized in that, The size of the synaptic particle structure is at the micro / nano scale.

11. The heat spreader according to claim 7, characterized in that, The first housing (1) is provided with a support column (6) on the side wall inside the sealed cavity (3) or the second housing (2) is provided with a support column (6) on the side wall inside the sealed cavity (3). The metal wire mesh layer (41) and the braided tape layer (42) are provided with clearance holes (7). One end of the support column (6) passes through the clearance hole (7) and is connected to the side wall inside the sealed cavity (3) of the second housing (2) or the side wall inside the sealed cavity (3) of the first housing (1). The surface of the support column (6) and the wall of the clearance hole (7) are both provided with the metal plating layer.

12. A radiator, characterized in that, Includes a heat spreader as described in any one of claims 1 to 11.

Images