A vapor chamber

Abstract

The application provides a uniform temperature plate, and relates to the technical field of heat dissipation devices. The uniform temperature plate comprises a support plate and a shell, the support plate and the shell enclose a cavity for filling a working medium, the plate surface of the support plate facing the shell is provided with a plurality of grooves and a plurality of support columns, and the end of each support column away from the support plate abuts against the shell. The uniform temperature plate can accelerate the circulation process of the working medium, thereby improving the heat exchange performance.

Description

Technical Field

[0001] This application relates to the field of heat dissipation device technology, and more specifically, to a heat exchanger plate. Background Technology

[0002] As a highly efficient heat transfer element, the heat spreader is widely used in the field of heat dissipation of electronic equipment. Its working principle mainly relies on the phase change cycle of the internal working fluid to achieve rapid heat transfer. The liquid wick structure is the key component for realizing the reflux of the working fluid.

[0003] Existing vapor chambers utilize the capillary force of a wick to transport the condensed liquid working fluid from the condensation end to the evaporation end. Common wick structures include sintered powder and metal mesh, which generate capillary effects by forming micron-sized pores. However, in practical applications, due to limitations in the pore structure or insufficient surface properties of the wick, the generated capillary force is often insufficient to meet the working fluid transport requirements, resulting in slow working fluid reflux and affecting heat transfer performance. Utility Model Content

[0004] The purpose of this application includes, for example, providing a heat exchanger that can accelerate the working fluid circulation process, thereby improving heat exchange performance.

[0005] The embodiments of this application can be implemented as follows:

[0006] An embodiment of this application provides a heat spreader, which includes a support plate and a shell. The support plate and the shell enclose a cavity for filling a working fluid. The support plate has a plurality of grooves and a plurality of support columns on its surface facing the shell. The end of each support column away from the support plate abuts against the shell.

[0007] Optionally, the plurality of grooves includes a first groove and a second groove and a third groove disposed on both sides of the first groove. There are multiple second grooves and third grooves, and at least a portion of the second grooves are connected to the first groove, and at least a portion of the third grooves are connected to the first groove. The end of the third groove away from the first groove extends to the edge of the support plate.

[0008] Optionally, the plurality of second grooves and the plurality of third grooves are arranged at equal intervals.

[0009] Optionally, the cross-sectional area of ​​the first trench is smaller than that of the third trench, and the cross-sectional areas of the second trench and the third trench are equal.

[0010] Optionally, at least a portion of the trench extends outward from the support post.

[0011] Optionally, the plurality of grooves includes a fourth groove and a fifth groove, the fourth groove extending from the support column toward the edge of the support plate, and the fifth groove extending between two of the support columns, wherein the fourth groove extends along a straight path, and at least a portion of the fifth groove extends along an arcuate path.

[0012] Optionally, a mesh structure is formed between the plurality of trenches.

[0013] Optionally, a drainage groove is provided on the side wall of the support column, and the drainage groove is connected to the groove extending outward from the support column.

[0014] Optionally, the drainage channel can be straight or spiral.

[0015] Optionally, the cross-sectional shape of the trench is trapezoidal, triangular, rectangular, or semi-circular.

[0016] Optionally, one of the support columns is located at the center of the support plate, and the remaining support columns are arranged around the support column located at the center of the support plate; or, all the support columns are arranged around the center of the support plate.

[0017] Optionally, the support column is cylindrical, frustum-shaped, or hourglass-shaped.

[0018] The beneficial effects of the heat spreader provided in this application include, for example, that by setting micron-sized grooves on the surface of the support plate, the working fluid can flow and distribute rapidly within these grooves. Simultaneously, the presence of the support columns not only provides the necessary mechanical strength but also guides the working fluid to flow rapidly back into the grooves along the direction of the support columns. This design makes the circulation process of the working fluid more efficient, significantly improving the overall heat transfer performance of the heat spreader. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is an exploded view of the heat spreader in the embodiments of this application;

[0021] Figure 2 This is a schematic diagram of the first type of support plate in the embodiments of this application;

[0022] Figure 3 This is a schematic diagram of the second type of support plate in the embodiments of this application;

[0023] Figure 4 This is a schematic diagram of the third type of support plate in the embodiments of this application.

[0024] Icons: 100-Support plate; 110-First groove; 120-Second groove; 130-Third groove; 140-Fourth groove; 150-Fifth groove; 160-Support column; 161-Drainage channel; 200-Shell. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the description of this application, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0029] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0030] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0031] Please refer to Figure 1This application provides a temperature distribution plate, including a support plate 100 and a shell 200, which are tightly fitted together to form a cavity for filling with a working fluid. It should be noted that the core of this structural design lies in eliminating the traditional liquid-absorbing core, and instead directly providing multiple grooves and multiple support columns 160 on the surface of the support plate 100 facing the shell 200. Specifically, one end of each support column 160 is fixed to the support plate 100, and the other end is away from the support plate 100 and eventually abuts against the shell 200, thereby achieving effective support for the entire internal structure of the cavity.

[0032] It should be understood that the above design aims to solve the problem of slow working fluid reflux in existing technologies. Traditional vapor chambers rely on the capillary force of the wick to transport the working fluid, but the capillary force is limited and the diffusion efficiency is low, making it difficult to meet the requirements of high-performance heat dissipation.

[0033] By creating micron-sized grooves on the surface of the support plate 100, the working fluid can flow and distribute rapidly within these grooves. Simultaneously, the presence of the support pillars 160 not only provides the necessary mechanical strength but also guides the working fluid to rapidly flow back into the grooves along the direction of the support pillars 160. This design makes the circulation process of the working fluid more efficient, significantly improving the overall heat transfer performance of the vapor chamber. The grooves can be formed using multiple processes (such as chemical etching, CNC machining, laser processing, etc.) to create a biomimetic capillary structure. This biomimetic capillary structure is designed based on leaf veins (such as forked veins, reticulated veins, parallel veins), forming a tree-branched capillary structure or a reticulated capillary structure. This biomimetic design enhances capillary force and the working fluid return speed.

[0034] In practical applications, when a gas-liquid phase change occurs inside the temperature distribution plate, the vapor condenses into a liquid working fluid on the inner wall of the shell 200. This liquid then flows rapidly back along the support column 160 and the inner wall of the shell 200 to the groove area on the support plate 100, aided by gravity or capillary action. Due to the excellent flow guiding characteristics of the grooves, the working fluid can quickly diffuse and distribute between the grooves, further accelerating the entire circulation process.

[0035] Please refer to Figure 2 In some embodiments, the plurality of grooves includes a first groove 110 and a second groove 120 and a third groove 130 disposed on both sides of the first groove 110. There are multiple second grooves 120 and third grooves 130, and at least a portion of the second grooves 120 are connected to the first groove 110, and at least a portion of the third grooves 130 are connected to the first groove 110. The end of the third groove 130 away from the first groove 110 extends to the edge of the support plate 100.

[0036] The support plate 100 is rectangular. The extension direction of the first groove 110 is consistent with the extension direction of one edge of the support plate 100, and the extension direction of the first groove 110 is in the direction of the line connecting the two support columns 160. The liquid working fluid condensed on the top wall of the inner shell 200 will flow back to the first groove 110 along the support column 160. A portion of the second groove 120 is connected to the first groove 110, and the liquid working fluid in the first groove 110 will flow to this portion of the second groove 120. At least one end of another portion of the second groove 120 extends to the support column 160. The liquid working fluid flowing back along the support column 160 will flow into the second groove 120. Part of the third groove 130 is connected to the first groove 110. One end of another part of the third groove 130 extends to the support column 160, and the end of the third groove 130 away from the first groove 110 extends to the edge of the support plate 100. The condensed liquid working fluid will flow into the corresponding third groove 130 along the support column 160 and the inner wall of the shell 200. The liquid working fluid will circulate between the first groove 110 and part of the third groove 130.

[0037] Optionally, there are four first grooves 110, two of which are parallel and extend along a first direction, and the other two are parallel and extend along a second direction. The first and second directions are perpendicular to each other. A second groove 120 and a third groove 130 are provided on both sides of any first groove 110.

[0038] In addition, multiple second grooves 120 and multiple third grooves 130 are equally spaced.

[0039] The second groove 120 and the third groove 130 are both inclined relative to the first groove 110. The multiple second grooves 120 are parallel to each other and equally spaced. The multiple third grooves 130 are parallel to each other and equally spaced. The first groove 110, the second groove 120 and the third groove 130 are arranged at an angle to each other.

[0040] By designing the multiple second grooves 120 and multiple third grooves 130 to be equally spaced, a more uniform distribution of the liquid working fluid on the support plate 100 is ensured. Specifically, this equally spaced design effectively avoids the problem of local accumulation of liquid working fluid caused by uneven spacing between grooves. In other embodiments, the multiple second grooves 120 or the multiple third grooves 130 can also be arranged with unequal spacing, which can also improve the distribution of liquid working fluid on the support plate 100 and enhance the overall heat transfer performance of the heat exchanger.

[0041] In this embodiment, the cross-sectional area of ​​the first groove 110 is smaller than that of the third groove 130, while the cross-sectional areas of the second groove 120 and the third groove 130 are equal. It should be noted that the cross-sectional area of ​​the groove refers to the area of ​​its cross-section. This design directly determines the flow characteristics of the liquid working fluid between different grooves within the heat spreader. It should be understood that by reasonably adjusting the cross-sectional area of ​​each groove, the flow path and distribution of the liquid working fluid can be optimized, thereby improving the overall performance of the heat spreader.

[0042] Specifically, during the operation of the heat spreader, because the cross-sectional area of ​​the first groove 110 is relatively small, its flow resistance is relatively large. Therefore, the liquid working fluid is more likely to flow along the low-resistance path to the second groove 120 and the third groove 130, which have larger cross-sectional areas. This design allows the liquid working fluid to be distributed more evenly on the support plate 100, avoiding the problem of local accumulation caused by the mismatch of groove cross-sectional areas.

[0043] When the liquid working fluid flows out of the first channel 110, since the cross-sectional areas of the second channel 120 and the third channel 130 are the same, their attraction to the working fluid is basically the same, thus achieving balanced diversion of the working fluid between the two channels.

[0044] Optionally, according to the minimum entropy generation criterion, the ratio of the cross-sectional area S1 of the first groove 110 to the cross-sectional area S2 of the second groove 120 or the third groove 130 satisfies: S1 / S2 = 2 -1 / 3 Under this ratio, the liquid working fluid can be rapidly distributed between the first groove 110, the second groove 120 and the third groove 130.

[0045] In some embodiments, at least a portion of the groove extends outward from the support column 160, specifically in terms of the geometric continuity of the groove, i.e., the groove does not exist independently, but is formed by extending outward from the support column 160 in its radial direction.

[0046] Since the grooves extend outward from the support column 160, the liquid working medium can quickly diffuse to the surrounding area through these grooves. The diffusion process is based on the geometry and positional relationship of the grooves, that is, the liquid working medium gradually moves away from the support column 160 and moves to other areas of the heat spreader along the path of the grooves, so as to achieve rapid distribution of the liquid working medium on the support plate 100.

[0047] In some embodiments, a flow channel 161 is also provided on the side wall of the support column 160. The flow channel 161 is connected to the groove extending outward from the support column 160. This allows the support column 160 to not only enhance the overall structural strength of the heat exchange plate, but also guide the liquid working fluid to flow towards the support plate 100 through its own flow channel 161. The number of flow channels 161 can match the number of grooves extending outward from the support column 160, and there is no limitation on this.

[0048] Optionally, the drainage channel 161 can be straight or spiral. It should be noted that a straight drainage channel means that the drainage channel 161 extends in a straight line on the projection plane parallel to the support plate; a spiral drainage channel means that the drainage channel 161 is spirally arranged around the support column 160.

[0049] Please refer to Figure 3 In an optional embodiment, the plurality of grooves include a fourth groove 140 and a fifth groove 150, the fourth groove 140 extending from the support post 160 toward the edge of the support plate 100, and the fifth groove 150 extending between two of the support posts 160, wherein the fourth groove 140 extends along a straight path and at least a portion of the fifth groove 150 extends along an arcuate path.

[0050] The fourth groove 140 extends from the support column 160 to the edge of the support plate 100. The liquid working fluid can flow from the groove on the support column 160 through the fourth groove 140 to the edge of the support plate 100. At the same time, the fifth groove 150 extends between any two support columns 160. Part of the fifth groove 150 extends along an arc path, and part of the fifth groove 150 extends along a straight path. The liquid working fluid can flow between any two support columns 160, so that the liquid working fluid can be distributed on the entire surface of the support plate 100, thereby improving the heat exchange efficiency.

[0051] Please refer to Figure 4 In another alternative embodiment, a mesh structure is formed between the multiple trenches.

[0052] It should be noted that the formation of a network structure between multiple trenches specifically means that the connection between the trenches is not isolated, but rather that they are interconnected to form a network-like geometric layout. This layout ensures that the liquid working fluid can flow from one trench to another in any direction, thereby achieving efficient heat conduction.

[0053] Specifically, inside the heat spreader, the liquid working fluid flows and evaporates along the grooves. Because a mesh structure is formed between the grooves, the liquid working fluid not only covers the area corresponding to a single groove during its flow but also expands to a larger area through the connectivity between adjacent grooves. This design allows the liquid working fluid to be evenly distributed across the surface of the support plate 100, rather than being confined to a specific area, thus preventing localized overheating.

[0054] It should be understood that the design principle of the mesh structure is to improve the distribution efficiency of the liquid working fluid by increasing the transport paths of the liquid working fluid. When the liquid working fluid disperses outward from a certain support column 160, the liquid working fluid can reach different areas of the support plate 100 through multiple branch paths in the mesh structure.

[0055] In optional embodiments, the cross-sectional shape of the trench is trapezoidal, triangular, rectangular, or semi-circular. It is understood that the cross-sectional shape of the trench is not limited to the four forms listed above. It should be understood that these shapes are exemplary structures selected based on typical application scenarios and common design requirements, with the aim of improving the overall performance of the vapor chamber by optimizing the flow characteristics and thermal conductivity of the liquid working fluid.

[0056] In practical design, the selection of the cross-sectional shape of the trench needs to comprehensively consider factors such as the working environment of the vapor chamber, heat dissipation requirements, and manufacturing process. For example, a trapezoidal cross-section can provide a larger contact area to enhance the capillary driving effect, making it suitable for applications under high heat load conditions; a triangular cross-section guides the liquid working fluid to concentrate in the central area through its pointed tip design, thereby achieving a more uniform heat distribution; a rectangular cross-section is suitable for scenarios where the fluid distribution requires regularity; and a semi-circular cross-section, due to its smooth curve transition, can effectively reduce fluid turbulence, making it suitable for low-noise or low-vibration applications.

[0057] In some embodiments, one support column 160 is disposed at the center of the support plate 100, and the remaining support columns 160 are disposed around the support column 160 located at the center of the support plate 100; or, all the support columns 160 are disposed around the center of the support plate 100.

[0058] For example, there are five support columns 160, one of which is located at the center of the support plate 100, and the other four support columns 160 are arranged around the support column 160 located at the center of the support plate 100, and the four support columns 160 are located on the same rectangular path; or, there is no support column 160 at the center of the support plate 100, and there are four support columns 160, which are located on the same rectangular path.

[0059] Understandably, the arrangement of the support columns 160 can be determined according to actual needs, and there are no restrictions on it.

[0060] In optional embodiments, the support column 160 is cylindrical, frustum-shaped, or hourglass-shaped. For example, when the support column 160 is frustum-shaped, the larger end face of the support column 160 is disposed on the support plate 100, and the smaller end face of the support column 160 abuts against the inner top wall of the housing 200. During the process of the liquid working medium flowing from the support column 160 toward the support plate 100, the liquid working medium is more likely to diffuse and flow to the outside of the support column 160. When the support column 160 is hourglass-shaped, the diameter of the upper and lower end faces of the support column 160 is larger than that of the middle part. During the process of the liquid working medium flowing from the support column 160 toward the support plate 100, the liquid working medium first flows to the middle part of the support column 160 to converge, and then disperses downward to the grooves on the support plate 100.

[0061] In summary, the embodiments of this application provide a heat exchange plate, which includes a support plate 100 and a shell 200. By setting micron-sized grooves on the surface of the support plate 100, the working fluid can flow and distribute rapidly in these grooves. At the same time, the presence of the support column 160 not only provides the necessary mechanical strength, but also guides the working fluid to flow back rapidly into the grooves along the direction of the support column 160, accelerating the working fluid circulation process and thus improving the heat exchange performance of the heat exchange plate.

[0062] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A heat spreader, characterized in that, It includes a support plate and a shell, the support plate and the shell enclose a cavity for filling a working medium, the support plate has a plurality of grooves and a plurality of support columns on its plate surface facing the shell, and the end of each support column away from the support plate abuts against the shell; A drainage groove is provided on the side wall of the support column, and the drainage groove is connected to the groove extending outward from the support column.

2. The temperature distribution plate according to claim 1, characterized in that, The plurality of grooves includes a first groove and a second groove and a third groove disposed on both sides of the first groove. There are multiple second grooves and multiple third grooves. At least a portion of the second grooves are connected to the first groove, and at least a portion of the third grooves are connected to the first groove. The end of the third groove away from the first groove extends to the edge of the support plate.

3. The temperature distribution plate according to claim 2, characterized in that, The multiple second grooves and the multiple third grooves are all equally spaced.

4. The temperature distribution plate according to claim 2, characterized in that, The cross-sectional area of ​​the first trench is smaller than that of the third trench, and the cross-sectional areas of the second trench and the third trench are equal.

5. The temperature distribution plate according to claim 1, characterized in that, At least a portion of the groove extends outward from the support column.

6. The temperature distribution plate according to claim 5, characterized in that, The plurality of grooves includes a fourth groove and a fifth groove, the fourth groove extending from the support column toward the edge of the support plate, and the fifth groove extending between two of the support columns, wherein the fourth groove extends along a straight path and at least a portion of the fifth groove extends along an arcuate path.

7. The temperature distribution plate according to claim 5, characterized in that, The multiple trenches form a mesh structure.

8. The temperature distribution plate according to claim 7, characterized in that, The drainage channel can be straight or spiral.

9. The temperature distribution plate according to claim 1, characterized in that, The cross-sectional shape of the trench is trapezoidal, triangular, rectangular, or semi-circular.

10. The temperature distribution plate according to claim 1, characterized in that, One of the support columns is located at the center of the support plate, and the remaining support columns are arranged around the support column located at the center of the support plate; or, all the support columns are arranged around the center of the support plate.

11. The temperature distribution plate according to claim 1, characterized in that, The support column is cylindrical, frustum-shaped, or hourglass-shaped.

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