Vapor chamber

Abstract

The utility model relates to the technical field of heat transfer devices, and particularly discloses a vapor chamber which comprises an upper shell plate, at least one layer of liquid absorption core and a lower shell plate which are sequentially arranged from top to bottom, a vacuum cavity is formed between the upper shell plate and the lower shell plate, a plurality of through grooves which vertically penetrate through the liquid absorption core are formed in the liquid absorption core, and a plurality of through holes are formed in the lower shell plate. And the through groove forms a flow channel for steam in the vacuum chamber of the vapor chamber to flow. The liquid absorbing core is provided with the plurality of through grooves which vertically penetrate through the liquid absorbing core, and the through grooves are vertically connected with the steam cavity, so that not only is the steam flowing space improved, but also the fluid state can be changed in the bubble forming process, heat can be quickly taken away from a heat source under long-time operation, and the phenomenon of heat concentration is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of heat transfer devices, in particular to a heat spreader. Background Art

[0002] With the advancement of science and technology, the integration of various electronic products is constantly improving, so that the packaging space of electronic chips is getting smaller and smaller, and the heat flux density of equipment is increasing. High heat flux density brings great harm to integrated devices. Therefore, the heat dissipation requirements for high heat flux density devices are also getting higher and higher.

[0003] As an efficient heat dissipation device, the heat spreader has been widely used in the heat dissipation of electronic products. The heat spreader consists of an upper and lower cover plate, a support column located between the upper and lower cover plates, a capillary structure and a working medium. At present, the traditional series stacking structure can no longer meet the balance between the heat dissipation capillary and space. Utility Model Content

[0004] In order to solve the problem in the prior art that the heat spreader cannot satisfy the balance between the heat dissipation capillary and the space, the utility model provides a heat spreader.

[0005] The technical solution adopted by the utility model is: a heat spreader, comprising an upper shell plate, at least one layer of liquid absorbent core and a lower shell plate which are arranged in sequence from top to bottom, a vacuum chamber is formed between the upper shell plate and the lower shell plate, a plurality of through grooves which pass through the liquid absorbent core from top to bottom are opened on the liquid absorbent core, and the through grooves form flow channels for the flow of steam in the vacuum chamber of the heat spreader.

[0006] Furthermore, the through groove includes a first through groove and a second through groove; wherein the first through groove is located at an end of the liquid absorbent core close to the heat source, and the second through groove is located at an end of the liquid absorbent core away from the heat source.

[0007] Furthermore, the first through grooves are square, and a plurality of the first through grooves are arranged in a staggered manner at one end of the liquid absorbent core close to the heat source.

[0008] Furthermore, the second through slots are rectangular, and center lines of the second through slots in the length direction are parallel to each other.

[0009] Furthermore, one end of the second through groove along the length direction is close to the heat source, and the other end of the second through groove along the length direction is far away from the heat source.

[0010] Furthermore, a plurality of support columns arranged in an array are provided on the inner wall of the upper shell plate, one end of each support column is connected to the inner wall of the upper shell plate, and the other end of each support column is connected to the liquid absorbent core.

[0011] Furthermore, a plurality of first support columns arranged in an array are provided on the inner wall of the upper shell plate, and a plurality of second support columns arranged in an array are provided on the inner wall of the lower shell plate; wherein one end of the first support column is connected to the inner wall of the upper shell plate, and the other end of the first support column is connected to the absorbent core; one end of the second support column is connected to the inner wall of the lower shell plate, and the other end of the second support column is connected to the absorbent core.

[0012] Furthermore, the liquid wick is a capillary structure formed by sintering copper powder or copper wire mesh, and the upper shell plate and the lower shell plate are both made of copper.

[0013] The beneficial effect of the utility model is that a plurality of through grooves which penetrate the liquid absorbent core up and down are provided on the liquid absorbent core, and the through grooves are connected to the steam cavity up and down, which not only increases the steam flow space, but also can change the fluid state in the bubble forming process, which is beneficial to quickly take away the heat from the heat source during long-term operation and reduces the occurrence of heat concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is an exploded schematic diagram of a vapor chamber of the utility model;

[0015] Figure 2 It is a schematic diagram of the inner wall of the upper shell plate of a heat spreader of the utility model;

[0016] Figure 3 It is a schematic diagram of a liquid wick of a heat spreader of the utility model;

[0017] Figure 4 This is a schematic diagram of the inner wall of one embodiment of a lower shell plate of a vapor chamber according to the utility model;

[0018] Figure 5 This is a schematic diagram of the inner wall of another embodiment of a lower shell plate of a heat spreader of the utility model.

[0019] Figure numerals: 1, upper shell plate, 11, support column, 11', first support column, 2, liquid wick, 21, hollow hole, 22, hollow groove, 3, lower shell plate, 31, second support column. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0021] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is apparent to those skilled in the art that these specific details are not necessary to implement the present invention. In other examples, in order to avoid obscuring the present invention, well-known structures, circuits, materials or methods are not specifically described.

[0022] Throughout the specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment," "an embodiment," "an example," or "an example" appearing in various places throughout the specification do not necessarily all refer to the same embodiment or example. In addition, particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. In addition, it will be appreciated by those of ordinary skill in the art that the figures provided herein are for illustrative purposes and that the figures are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] In the description of the present invention, it should be understood that the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the scope of protection of the present invention.

[0024] The following is combined with Figure 1-5 The embodiments of the present utility model are described in detail.

[0025] Example 1

[0026] The utility model relates to a heat spreader, comprising an upper shell plate 1, at least one layer of liquid absorbent core 2 and a lower shell plate 3 which are arranged in sequence from top to bottom, a vacuum chamber is formed between the upper shell plate 1 and the lower shell plate 3, a plurality of through grooves which pass through the liquid absorbent core 2 from top to bottom are opened on the liquid absorbent core 2, and the through grooves form flow channels for the flow of steam in the vacuum chamber of the heat spreader.

[0027] Specifically, Figure 1-5As shown, the heat spreader is rectangular, and the heat spreader includes an upper shell plate 1, at least one layer of liquid absorbent core 2 and a lower shell plate 3, wherein the upper shell plate 1 and the lower shell plate 3 are both whole plates, and the liquid absorbent core 2 is a grid-shaped plate, that is, the liquid absorbent core 2 is a plate with a plurality of grids, and the grids are capillary structures. The upper shell plate 1 and the lower shell plate 3 are fixed together by welding with solder such as tin-lead solder or copper-based solder, and the interior is vacuumed to form a vacuum chamber between the upper shell plate 1 and the lower shell plate 3. In actual operation, taking a single-layer liquid absorbent core 2 as an example, a first groove can be opened on the inner wall of the upper shell, and a second groove can be opened on the inner wall of the lower shell, and the two surfaces of the liquid absorbent core 2 are respectively facing the first groove and the second groove and connected and fixed thereto, so that the working medium such as water and ethanol in the internal vacuum chamber of the heat spreader can move freely in the vacuum chamber.

[0028] In order to increase the flow space of water vapor or ethanol vapor, so that the heat can be quickly taken away from the heat source and reduce the occurrence of heat concentration, such as Figure 3 As shown, a plurality of through grooves are provided on the absorbent core 2, which are connected vertically through the absorbent core 2. The size of the through grooves is larger than the grid on the absorbent core 2 itself, which is similar to widening the grid on the absorbent core 2. The shape of the through grooves is not limited, as long as a steam channel can be formed. Due to the existence of the through grooves, the flow channel of the steam becomes larger, thereby increasing the flow space of the steam. For example, when the absorbent core 2 is not provided with through grooves, after the heat spreader contacts the heat source, the working medium in the vacuum chamber absorbs heat and vaporizes, and the steam moves to the condensation area only through the capillary effect of the absorbent core 2, and finally releases heat in the condensation area and turns into liquid, and then returns to the heat absorption area, and so on and so forth, to achieve heat transfer. When a through groove is provided on the liquid wick 2, after the heat spreader contacts the heat source, the working medium in the vacuum chamber absorbs heat and vaporizes. Due to the existence of the through groove, the steam not only moves from its own grid to the condensation zone, but also moves more from the through groove to the condensation zone. The entire steam flow channel becomes wider, which increases the steam flow space and reduces the steam flow resistance. In addition, since the heat is quickly taken away from the heat source, the occurrence of heat concentration is reduced, avoiding the phenomenon of burning dryness due to insufficient capillary force.

[0029] Example 2

[0030] This embodiment is an improvement made on the basis of the embodiment 1, the difference being that the through groove comprises a first through groove 21 and a second through groove 22; wherein the first through groove 21 is located at an end of the absorbent core 2 close to the heat source, and the second through groove 22 is located at an end of the absorbent core 2 away from the heat source.

[0031] Specifically, the through grooves include a first through groove 21 located at the end of the liquid absorbent core 2 close to the heat source and a second through groove 22 located at the end of the liquid absorbent core 2 far from the heat source, wherein the first through groove 21 may be larger than the second through groove 22, or may be smaller than or equal to the second through groove 22. The first through groove 21 is provided to increase the vertical flow path of the steam, and the second through groove 22 is provided to increase the horizontal flow path of the steam. Figure 3 As shown, in the present application, it is preferred that the first through groove 21 is smaller than the second through groove 22. This is because after the working medium is heated and vaporized, the steam itself will rise, that is, the rising process is easier; and the steam needs to move to the condensation area, and the smaller the resistance in the horizontal direction, the more conducive it is to its movement. Therefore, the first through groove 21 is smaller than the second through groove 22.

[0032] Example 3

[0033] This embodiment is an improvement made on the basis of the embodiment 1, the difference being that the first through grooves 21 are square, and a plurality of the first through grooves 21 are arranged in a staggered manner at the end of the liquid absorbent core 2 close to the heat source.

[0034] Specifically, Figure 3 As shown, the first through groove 21 is preferably a square first through groove 21. This is because the square first through groove 21 is symmetrical in shape. No matter from which angle you look at it, the speed at which steam enters and leaves the first through groove 21 is the same, which can better guide the flow of steam and reduce the generation of turbulence, thereby ensuring uniform flow of the fluid and avoiding flow instability caused by uneven steam flow.

[0035] In addition, in order to further improve the heat dissipation efficiency, the first through grooves 21 are staggeredly arranged at the end of the liquid absorbent core 2 close to the heat source. The staggered arrangement here means that the center points of any three adjacent first through grooves 21 are connected to form a triangle. Figure 3 As shown, there are 4 rows of first through grooves 21, which are staggered in the length direction of the absorbent core 2 and arranged from one end to the other end of the absorbent core 2. In actual use, the number of hollow holes 21 can be adjusted according to needs or the size of the heat spreader.

[0036] Example 4

[0037] This embodiment is an improvement made on the basis of the embodiment 1, the difference being that the second through slots 22 are rectangular, and the center lines of the second through slots 22 in the length direction are parallel to each other.

[0038] Specifically, Figure 3As shown, the second through groove 22 is preferably rectangular, and the length direction of the rectangular second through groove 22 is consistent with the length direction of the heat spreader, that is, one end of the second through groove 22 is close to the heat source, and the other end is close to the condensation zone, so that when the steam moves from the heat source to the condensation zone, it moves directly along the length direction of the second through groove 22. This is because: if the second through groove 22 is not provided on the absorbent core 2, taking the single-layer absorbent core 2 as an example, the steam flows from the heat absorption zone to the condensation zone in the form of a turbulent fluid, and the cooling effect is not good; and when the absorbent core 2 is provided with a rectangular second through groove 22 whose center lines in the length direction are parallel to each other, the speed of the steam moving to the condensation zone is consistent, and the uneven pressure inside the heat spreader will not cause bulging, and the rectangular second through groove 22 can better guide the steam flow, reduce the flow resistance in the horizontal direction, and improve the heat dissipation efficiency.

[0039] Example 5

[0040] This embodiment is an improvement made on the basis of the embodiment 1, and the difference lies in that one end of the second through groove 22 along the length direction is close to the heat source, and the other end of the second through groove 22 along the length direction is far away from the heat source.

[0041] Specifically, in order to reduce the resistance to horizontal flow of steam to a minimum, the second through groove 22 is arranged so that its two ends in the length direction are respectively close to the heat source and away from the heat source, so that when the steam flows from the heat source to the condensation area, it can flow directly along the length direction of the second through groove 22, thereby minimizing the flow resistance of the steam along the length direction of the second through groove 22.

[0042] Example 6

[0043] This embodiment is an improvement on the embodiment 1, the difference being that a plurality of support columns 11 arranged in an array are provided on the inner wall of the upper shell plate 1, one end of the support column 11 is connected to the inner wall of the upper shell plate 1, and the other end of the support column 11 is connected to the liquid absorbent core 2.

[0044] Specifically, since the heat spreader is usually designed as a large-area plate-like structure, after a vacuum cavity is formed inside, when it contacts a heat source, the working medium in the vacuum cavity begins to vaporize after being heated in a low vacuum environment, and the vaporized working medium absorbs heat energy, and the gas phase working medium rapidly expands and fills the entire vacuum cavity. At this time, the heat spreader with a large-area plate-like structure is prone to surface deformation or even surface collapse, which in turn affects the capillary force of the capillary structure. Therefore, in order to avoid the above problems, such as Figure 1As shown, a plurality of support columns 11 arranged in an array are provided on the inner wall of the upper shell plate 1, one end of the support column 11 is connected to the inner wall of the upper shell plate 1, and the other end of the support column 11 is connected to the liquid absorbent core 2, and the connection here can be a fixed connection method such as welding or fusion. Here, the support column 11 can be perpendicular to the inner wall of the upper shell plate 1, or it can be inclined to the inner wall of the upper shell plate 1. In this application, it is preferred that the support column 11 is perpendicular to the inner wall of the upper shell plate 1.

[0045] Example 7

[0046] This embodiment is an improvement on the basis of the embodiment 1, and the difference lies in that a plurality of first support columns 11' arranged in an array are provided on the inner wall of the upper shell plate 1, and a plurality of second support columns 31 arranged in an array are provided on the inner wall of the lower shell plate 3; wherein one end of the first support column 11' is connected to the inner wall of the upper shell plate 1, and the other end of the first support column 11' is connected to the absorbent core 2; one end of the second support column 31 is connected to the inner wall of the lower shell plate 3, and the other end of the second support column 31 is connected to the absorbent core 2.

[0047] Specifically, in order to further increase the flow space of steam, in addition to only setting a plurality of first support columns 11' arranged in an array on the inner wall of the upper shell plate 1, a plurality of second support columns 31 arranged in an array can also be set on the inner wall of the lower shell plate 3, and the second support columns 31 are also connected to the liquid absorbent core 2, that is, the first support columns 11' and the second support columns 31 are both connected to the liquid absorbent core 2, so that the entire structure is connected as a whole.

[0048] In addition, the support column 11 not only provides support and prevents the surface deformation or collapse of the heat spreader, and ensures the normal capillary force of the capillary structure, but also increases the flow space of steam, increases the reflux efficiency of the working medium, and improves the heat dissipation performance of the heat spreader.

[0049] Example 8

[0050] This embodiment is an improvement made on the basis of the embodiment 1, the difference being that the liquid wick 2 is a capillary structure sintered from copper powder or copper wire mesh, and the upper shell plate 1 and the lower shell plate 3 are both made of copper.

[0051] It should be noted that the upper shell plate 1 and the lower shell plate 3 can also be made of copper alloy, composite material, titanium, titanium composite material, etc., all of which can implement the above technical solution, and the liquid absorbent core 2 in the present application can also be arranged as a multi-layer liquid absorbent core 2 stacked arrangement, which can also implement the above technical solution.

[0052] The working process of the heat spreader is as follows: when the heat spreader contacts the heat source, the working medium begins to vaporize after being heated in the internal chamber with a low vacuum degree. The steam rises vertically along the inner wall of the first through groove 21 and moves horizontally along the direction of the second through groove 22 toward the condensation area. When the working medium enters the condensation area, condensation occurs, and the accumulated heat is released by condensation. The condensed working medium returns to the evaporation area again under the suction force of the capillary structure. This cycle completes the heat conduction and plays a heat dissipation role.

[0053] The above-mentioned embodiments only express the specific implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. A heat spreader, comprising an upper shell (1), at least one layer of liquid wick (2) and a lower shell (3) arranged in sequence from top to bottom, wherein a vacuum chamber is formed between the upper shell (1) and the lower shell (3), characterized in that: The liquid absorbent core (2) is provided with a plurality of through grooves which penetrate the liquid absorbent core (2) from top to bottom, and the through grooves form flow channels for the steam in the vacuum chamber of the heat spreader.

2. The vapor chamber according to claim 1, characterized in that: The through groove comprises a first through groove (21) and a second through groove (22); Wherein, the first through groove (21) is located at an end of the liquid absorbent core (2) close to the heat source, and the second through groove (22) is located at an end of the liquid absorbent core (2) far from the heat source.

3. The heat sink according to claim 2, characterized in that: The first through grooves (21) are square in shape, and a plurality of the first through grooves (21) are arranged in a staggered manner at one end of the liquid absorbent core (2) close to the heat source.

4. The heat sink according to claim 2, characterized in that: The second through slots (22) are rectangular, and the center lines of the second through slots (22) in the length direction are parallel to each other.

5. The vapor chamber according to claim 4, characterized in that: One end of the second through groove (22) along the length direction is close to the heat source, and the other end of the second through groove (22) along the length direction is far away from the heat source.

6. The vapor chamber according to claim 1, characterized in that: A plurality of support columns (11) arranged in an array are provided on the inner wall of the upper shell plate (1), one end of the support column (11) is connected to the inner wall of the upper shell plate (1), and the other end of the support column (11) is connected to the liquid absorbent core (2).

7. The vapor chamber according to claim 1, characterized in that: A plurality of first support columns (11') arranged in an array are provided on the inner wall of the upper shell plate (1), and a plurality of second support columns (31) arranged in an array are provided on the inner wall of the lower shell plate (3); Wherein, one end of the first support column (11') is connected to the inner wall of the upper shell plate (1), and the other end of the first support column (11') is connected to the liquid absorbent core (2); One end of the second support column (31) is connected to the inner wall of the lower shell plate (3), and the other end of the second support column (31) is connected to the liquid absorbent core (2).

8. The vapor chamber according to claim 1, characterized in that: The liquid wick (2) is a capillary structure formed by sintering copper powder or copper wire mesh, and the upper shell plate (1) and the lower shell plate (3) are both made of copper.

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