An ultra-thin heat spreader

Abstract

This invention provides an ultrathin vapor chamber, relating to the field of vapor chamber technology. The ultrathin vapor chamber includes a housing assembly, which includes a lower housing. A vacuum cavity is formed on the upper surface of the lower housing. Multiple partition plates of different specifications are fixedly connected to the inner bottom surface of the vacuum cavity. Each partition plate has branch grooves, which are interconnected to form a rice-shaped branch groove. The housing assembly also includes flow channel grooves formed by the partition plates. This invention provides an ultrathin vapor chamber that, through its rice-shaped branch groove and multi-flow channel groove interconnection design, achieves a significant improvement in gas-liquid phase change circulation efficiency. Vapor can rapidly and uniformly diffuse along the rice-shaped branch grooves into the flow channel grooves in all directions within the vacuum cavity, greatly shortening the heat transfer path and ensuring that the vapor chamber, even in its ultrathin form, still achieves efficient lateral heat diffusion and temperature uniformity, effectively meeting the heat dissipation requirements of high-power-density devices.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger technology, specifically to an ultrathin heat exchanger. Background Technology

[0002] With the rapid development of technologies such as electronic devices, computers, LED lighting, and solar photovoltaics, the thermal management of equipment has become increasingly prominent. Especially in high-power electronic devices and LED lighting, heat dissipation has become a major factor restricting performance improvement and service life. Although traditional heat dissipation technologies have solved the heat dissipation problem to some extent, they face many challenges as power density continues to increase. On the one hand, the heat dissipation efficiency and heat dissipation area of ​​traditional heat dissipation technologies are limited, making it difficult to meet the heat dissipation requirements of high-power electronic devices. On the other hand, with the trend of miniaturization and integration of equipment, the size of equipment is getting smaller and smaller, and the limitation of heat dissipation space makes traditional heat dissipation technologies less effective in applications. Against this backdrop, vapor chambers have gradually been adopted as a new type of heat dissipation technology. Summary of the Invention

[0003] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides an ultrathin vapor chamber. This ultrathin vapor chamber achieves precise control of localized condensation through the introduction of a barrier plate, which enhances the steam condensation effect in high heat flux areas. Combined with precision processing techniques such as chemical etching, it forms a uniformly rough flow channel, ensuring low resistance to steam flow and improving the working fluid adsorption capacity of the capillary structure. The overall structure, despite its ultrathin design, still meets the requirements of rapid steam diffusion and efficient working fluid recirculation, demonstrating excellent structural integration and thermal management adaptability.

[0004] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: An ultrathin heat spreader includes a shell assembly. The shell assembly includes a lower shell, and a vacuum cavity is provided on the upper surface of the lower shell. Multiple partition plates of different specifications are fixedly connected to the inner bottom surface of the vacuum cavity. Each of the partition plates has a branch groove, and the multiple branch grooves are interconnected to form a rice-shaped branch groove. The shell assembly also includes a flow channel groove obtained by the partition plates. Multiple baffle plates of the same specification are fixedly connected to the middle of the inner bottom surface of each flow channel groove. A capillary assembly is also provided inside the vacuum cavity. The capillary assembly includes a first liquid suction core and a second liquid suction core. Side liquid suction cores are fixedly connected to the outer wall of the partition plates on the side near the middle of the lower shell and the side away from the middle of the lower shell. An upper shell is provided at the upper end of the shell assembly. Through the above technical solution, the ultrathin heat spreader plate, with its unique three-dimensional layout of capillary components, forms a continuous and highly permeable working fluid reflux network through the tight connection of the first liquid-absorbing core, the second liquid-absorbing core and the side liquid-absorbing core. This structure not only enhances the working fluid transport capacity driven by capillary force, but also effectively ensures that the condensate is returned to the heat source area in a timely manner.

[0005] Preferably, the edge of the upper surface of the lower housing is fixedly connected to the edge of the lower surface of the upper housing, and the upper and lower surfaces of the plurality of barrier plates are respectively fixedly connected to the middle of the lower surface of the upper housing and the inner bottom surface of the vacuum cavity. Through the above technical solution, the baffle plate is set and the baffle plate at the corresponding position is cooled by the cooling end. When the working fluid vapor encounters the low temperature baffle plate, it is liquefied, thereby wetting the capillary component.

[0006] Preferably, the lower surface of the first liquid-absorbing core is fixedly connected to the inner bottom surface of the vacuum cavity, the second liquid-absorbing core is fixedly connected to the lower surface of the upper shell, and the upper and lower surfaces of the side liquid-absorbing core are respectively fixedly connected to the second liquid-absorbing core and the first liquid-absorbing core. The above technical solution enables the working fluid to flow effectively through the first suction core, the second suction core, and the side suction core.

[0007] Preferably, the rice-shaped branch groove is connected in a continuous manner with the plurality of flow channel grooves; The above technical solution enables the working fluid steam to flow rapidly into the flow channel at different locations through the rice-shaped branch channel.

[0008] Preferably, the first liquid-absorbing core, the second liquid-absorbing core, and the side liquid-absorbing core are all made of metal fiber material, three-dimensional porous graphene foam, graphene nanosheet sintered body, and open-cell copper foam, or one or more of these materials combined. The above technical solutions can effectively improve the permeability of the first absorbent core, the second absorbent core, and the side absorbent core.

[0009] Preferably, the vacuum cavity and the rice-shaped branching groove are formed by any one of the following processes: chemical etching, laser processing, or micro-electro-discharge machining. However, the inner walls of the vacuum cavity and the rice-shaped branching groove are relatively rough, which can affect the flow velocity of the working fluid vapor. The above technical solutions can effectively improve precision and thus avoid [problems].

[0010] Preferably, the diameter of the flow channel is the same as the diameter of the rice-shaped branch channel; By using the above technical solution, and by ensuring that the diameters of the flow channel and the branch channel are the same, the problem of excessive steam entering the flow channel or branch channel due to the difference in diameter between the flow channel and the branch channel after the working fluid evaporates can be effectively avoided.

[0011] (III) Beneficial Effects This invention provides an ultrathin heat spreader. It has the following beneficial effects: 1. This invention provides an ultrathin heat spreader plate. Through its innovative design of interconnected rice-shaped branch grooves and multi-channel grooves, the ultrathin heat spreader plate achieves a significant improvement in gas-liquid phase change circulation efficiency. In the vacuum chamber, vapor can quickly and uniformly diffuse along the rice-shaped branch grooves to the channel grooves in all directions, greatly shortening the heat transfer path and ensuring that the heat spreader plate can still achieve efficient lateral heat diffusion and temperature uniformity in an ultrathin form, effectively meeting the heat dissipation requirements of high power density devices.

[0012] 2. The present invention provides an ultrathin heat exchange plate. The ultrathin heat exchange plate forms a continuous and highly permeable working fluid reflux network through a unique three-dimensional layout of capillary components and a tight connection between the upper and lower liquid suction cores and the side liquid suction cores. This structure not only enhances the working fluid transport capacity driven by capillary force, but also effectively ensures that the condensate is returned to the heat source area in a timely manner.

[0013] 3. This invention provides an ultrathin heat spreader plate. The ultrathin heat spreader plate achieves precise control of local condensation by introducing a barrier plate, which can enhance the steam condensation effect in high heat flux areas. Combined with precision processing technology such as chemical etching, it forms a uniformly rough flow channel, which not only ensures low resistance to steam flow, but also improves the working fluid adsorption capacity of the capillary structure. The overall structure still takes into account the requirements of rapid steam diffusion and efficient working fluid reflux under the ultrathin limitation, demonstrating excellent structural integration and thermal management adaptability. Attached Figure Description

[0014] Figure 1 This is an exploded view of the ultrathin heat spreader of the present invention; Figure 2 This is a schematic diagram of the shell assembly in the ultrathin heat spreader of the present invention; Figure 3 This is a schematic diagram of the capillary assembly in the ultrathin heat spreader of the present invention; Figure 4 This is an exploded view of the capillary assembly in the ultrathin heat spreader of the present invention; Figure 5 This is a partial structural diagram of the ultrathin heat spreader plate of the present invention after the shell assembly and capillary assembly are combined.

[0015] in, 1. Housing assembly; 101. Lower housing; 102. Vacuum cavity; 103. Partition plate; 104. Meter-shaped branch groove; 105. Barrier plate; 106. Flow channel groove; 2. Capillary assembly; 201. First suction core; 202. Second suction core; 203. Side suction core; 3. Upper shell. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Example 1: Reference Figure 1 , Figure 2 and Figure 3 : An ultrathin heat spreader includes a housing assembly 1, which includes a lower housing 101. A vacuum cavity 102 is provided on the upper surface of the lower housing 101. Multiple partition plates 103 of different specifications are fixedly connected to the inner bottom surface of the vacuum cavity 102. Each partition plate 103 has a branch groove, which is interconnected to form a rice-shaped branch groove 104. The housing assembly 1 also includes a flow channel 106 obtained by the partition plates 103. Multiple barrier plates 105 of the same specification are fixedly connected to the middle of the inner bottom surface of the flow channel 106. A capillary assembly 2 is also provided inside the vacuum cavity 102. The capillary assembly 2 includes a first liquid suction core 201 and a second liquid suction core 202. Side liquid suction cores 203 are fixedly connected to the outer wall of the partition plate 103 on the side near the middle of the lower housing 101 and the side away from the middle of the lower housing 101. An upper housing 3 is provided at the upper end of the housing assembly 1. The ultrathin heat spreader plate, through its unique three-dimensional layout of capillary components 2, forms a continuous and highly permeable working fluid reflux network through the tight connection of the first liquid absorption core 201, the second liquid absorption core 202 and the side liquid absorption core 203. This structure not only enhances the working fluid transport capacity driven by capillary force, but also effectively ensures that the condensate is returned to the heat source area in a timely manner.

[0018] Reference Figure 1 , Figure 4 and Figure 5 : The edge of the upper surface of the lower housing 101 is fixedly connected to the edge of the lower surface of the upper housing 3. The upper and lower surfaces of multiple baffles 105 are respectively fixedly connected to the middle of the lower surface of the upper housing 3 and the inner bottom surface of the vacuum cavity 102. Thus, through the baffles 105, the corresponding baffles 105 are cooled by the cooling end. When the working fluid vapor encounters the low temperature baffles 105, it is liquefied, thereby wetting the capillary assembly 2. The lower surface of the first liquid suction core 201 is fixed to the inner bottom surface of the vacuum cavity 102. The second suction core 202 is fixedly connected to the lower surface of the upper shell 3. The upper and lower surfaces of the side suction core 203 are fixedly connected to the second suction core 202 and the first suction core 201, respectively, so that the working fluid can flow effectively through the first suction core 201, the second suction core 202, and the side suction core 203. The Michelin-shaped branch groove 104 is connected to multiple flow channel grooves 106, so that the working fluid vapor can quickly flow into the flow channel grooves 106 at different positions through the Michelin-shaped branch groove 104. The liquid core 201, the second liquid core 202, and the side liquid core 203 are all made of one or more of the following materials: metal fiber, three-dimensional porous graphene foam, graphene nanosheet sintered body, and open-cell copper foam. This effectively enhances the high permeability of the first liquid core 201, the second liquid core 202, and the side liquid core 203. The vacuum cavity 102 and the Mi-shaped branch groove 104 are formed by chemical etching, laser processing, or micro-electrical discharge machining. The inner wall is relatively rough, which affects the flow rate of the working fluid vapor. This can effectively improve the fineness and avoid the problem of excessive steam entering the flow channel 106 or the Mi-shaped branch channel 104 after the working fluid evaporates due to the difference in the channel diameter between the flow channel 106 and the Mi-shaped branch channel 104.

[0019] Example 2: Reference Figures 1-5If the heat source is placed anywhere on the lower surface of the lower housing 101 and the cooling end is placed anywhere on the upper surface of the upper housing 3, when the heat source heats the lower housing 101, the working fluid contained in the first liquid suction core 201 is vaporized. Then, because the vacuum cavity 102 is in a vacuum state, the vaporized fluid flows inside the flow channel 106. The vaporized fluid flows quickly into the flow channel 106 at different positions through the rice-shaped branch channel 104. During the flow, the cooling end cools the baffle plate 105. When the high-temperature vaporized fluid collides with the baffle plate 105, it is liquefied and remains on the outer wall of the baffle plate 105. Then, the working fluid is guided by the first liquid suction core 201, the second liquid suction core 202 and the side liquid suction core 203. In this embodiment, the barrier plate 105 is preferably made of copper, and the working fluid is preferably acetone.

[0020] Example 3: Reference Figures 1-5 The heat source is placed at any point in the lower shell 101 or the upper shell 3, while the cooling end is placed at the opposite position to the heat source. The flow state of the working fluid after evaporation is the same as in Example 2, and will not be repeated here. The difference is that the working fluid in this example is preferably a fluorinated liquid. The similarity is that the gas-liquid phase change cycle efficiency is the same.

[0021] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "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. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An ultrathin heat spreader, comprising a housing assembly (1), characterized in that: The housing assembly (1) includes a lower housing (101), the upper surface of which is provided with a vacuum cavity (102). Multiple partition plates (103) of different specifications are fixedly connected to the inner bottom surface of the vacuum cavity (102). Each partition plate (103) has a branch groove, which interconnects to form a rice-shaped branch groove (104). The housing assembly (1) also includes a flow channel groove (106) obtained by the partition plates (103). 06) Multiple baffles (105) of the same specification are fixedly connected to the middle of the inner bottom surface. The vacuum cavity (102) is also provided with a capillary assembly (2). The capillary assembly (2) includes a first liquid suction core (201) and a second liquid suction core (202). The side liquid suction core (203) is fixedly connected to the outer wall of the partition plate (103) on the side near the middle of the lower shell (101) and the side away from the middle of the lower shell (101). The upper shell (3) is provided at the upper end of the shell assembly (1).

2. The ultrathin heat spreader according to claim 1, characterized in that: The edge of the upper surface of the lower housing (101) is fixedly connected to the edge of the lower surface of the upper housing (3), and the upper and lower surfaces of the plurality of barrier plates (105) are respectively fixedly connected to the middle of the lower surface of the upper housing (3) and the inner bottom surface of the vacuum cavity (102).

3. The ultrathin heat spreader according to claim 1, characterized in that: The lower surface of the first liquid suction core (201) is fixedly connected to the inner bottom surface of the vacuum cavity (102), the second liquid suction core (202) is fixedly connected to the lower surface of the upper shell (3), and the upper and lower surfaces of the side liquid suction core (203) are fixedly connected to the second liquid suction core (202) and the first liquid suction core (201) respectively.

4. The ultrathin heat spreader according to claim 1, characterized in that: The rice-shaped branch groove (104) is connected to the plurality of flow channel grooves (106).

5. The ultrathin heat spreader according to claim 1, characterized in that: The first liquid-absorbing core (201), the second liquid-absorbing core (202), and the side liquid-absorbing core (203) are all made of metal fiber, three-dimensional porous graphene foam, graphene nanosheet sintered body, and open-pore copper foam, or one or more of these materials.

6. The ultrathin heat spreader according to claim 1, characterized in that: The vacuum cavity (102) and the rice-shaped branch groove (104) are formed by any one of the following processes: chemical etching, laser processing, or micro-electrical discharge machining.

7. The ultrathin heat spreader according to claim 1, characterized in that: The diameter of the flow channel (106) is the same as that of the rice-shaped branch channel (104).

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