A heat exchanger with adjustable surface temperature

Abstract

This invention relates to a vapor chamber with adjustable surface temperature, comprising a first cover plate, a second cover plate, a capillary structure, and a heat insulation plate. A first sealed chamber is formed between the first and second cover plates, and the first sealed chamber is filled with a working fluid. The capillary structure is located within the first sealed chamber. A second sealed chamber is formed between the heat insulation plate and the first and / or the second cover plate. Both the first and second sealed chambers are vacuum environments. This application utilizes the heat insulation plate and the first and / or second cover plates to form a vacuum-sealed second sealed chamber. By leveraging the excellent heat insulation properties of vacuum, heat conduction is blocked, significantly reducing the surface temperature of the heat insulation plate area compared to other areas of the vapor chamber. This achieves localized temperature control of the vapor chamber and effectively prevents the high surface temperature of the vapor chamber from affecting the normal operation of surrounding electronic components.

Description

Technical Field

[0001] This invention relates to the field of heat spreader technology, and more specifically, to a heat spreader with adjustable surface temperature. Background Technology

[0002] With the widespread application of 5G portable smart devices, electronic devices are rapidly evolving towards higher power and miniaturization. This trend has resulted in extremely limited internal space for electronic devices, significantly restricting the size of heat dissipation components. Therefore, efficiently dissipating high heat flux density within such confined spaces has become a critical issue that urgently needs to be addressed. Currently, among numerous heat dissipation solutions, vapor chambers are gradually becoming an important choice in the field of 5G portable smart device heat dissipation due to their significant advantages such as high thermal conductivity, good temperature uniformity, small size, and compact structure.

[0003] When a vapor chamber is in operation, its surface temperature rises and the temperature difference between different areas of the surface is small, hence the name vapor chamber. However, with the increasing integration of electronic devices, circuit boards and various electronic components are usually densely arranged around the heat-generating components. The surface temperature of existing vapor chambers cannot be adjusted, and the heat generated during operation can easily be transferred to the surrounding area through heat conduction and heat radiation, which can easily interfere with the normal operation of surrounding electronic components, and even cause component performance degradation and shortened service life. Summary of the Invention

[0004] In view of this, the present invention provides a heat spreader that can achieve temperature regulation of a local area to avoid affecting the normal operation of surrounding electronic components.

[0005] The objective of this invention is achieved through the following technical solution: A heat spreader with adjustable surface temperature includes a first cover plate, a second cover plate, a capillary structure, and a heat insulation plate. A first closed chamber is formed between the first cover plate and the second cover plate, and the first closed chamber is filled with a working fluid. The capillary structure is located in the first closed chamber. A second closed chamber is formed between the heat insulation plate and the first cover plate, and / or the second cover plate. Both the first closed chamber and the second closed chamber are in a vacuum environment.

[0006] In the above scheme, the first cover plate and the second cover plate are combined to form a sealed first closed chamber. The first closed chamber is a vacuum environment. It is equipped with a capillary structure and filled with working fluid. After absorbing the heat of the heating element in the heat absorption zone, the working fluid evaporates and vaporizes. The gaseous working fluid diffuses to the heat release zone to release heat and condenses into a liquid state. The capillary structure drives the condensed liquid working fluid to flow back to the heat absorption zone in a directional manner, completing the complete phase change cycle of the working fluid, so as to continuously and efficiently remove the heat of the heating element and realize the heat dissipation effect on the heating element. A second sealed chamber is formed between the heat insulation plate and the first cover plate and / or the second cover plate. The interior of the second sealed chamber is a vacuum environment. Heat transfer is significantly blocked under vacuum conditions, providing excellent heat insulation performance. This effectively blocks the heat from the heat spreader plate from being conducted to the heat insulation plate, making the surface temperature of the heat insulation plate area significantly lower than the surface temperature of other areas of the heat spreader plate. The position and number of heat insulation plates are set according to the position and number of surrounding electronic components that need to be heat-insulated and protected. Through this design, the temperature of local areas of the heat spreader plate can be controlled, preventing the surface temperature of the heat spreader plate from being too high and interfering with or affecting the normal operation of other surrounding electronic components.

[0007] Optionally, in one possible implementation, the first cover plate includes a first side and a second side facing each other, the second side of the first cover plate and the second cover plate forming the first closed chamber, and the heat insulation plate and the first side of the first cover plate forming the second closed chamber.

[0008] In the above scheme, the second side of the first cover plate and the second cover plate form a first closed chamber, and the second side and the heat insulation plate form a second closed chamber, so that the two chambers are placed on both sides of the first cover plate, independent of each other and without interference. This arrangement is to match the situation where the heat spreader is located between the heating element and the element to be protected. In this installation layout, the second cover plate is in contact with the heating element to absorb heat, and the heat insulation plate is located on the side of the first cover plate away from the second cover plate to provide heat insulation protection for the element to be protected.

[0009] Optionally, in one possible implementation, the first surface of the first cover plate is provided with a heat insulation groove that cooperates with the heat insulation plate, and the heat insulation plate and the heat insulation groove cooperate to form the second closed chamber.

[0010] In the above scheme, the heat insulation groove is located on the first surface of the first cover plate and is recessed towards the first closed chamber so as to cooperate with the heat insulation plate to form a second closed chamber.

[0011] Optionally, in one possible implementation, the surface of the heat insulation plate near the heat insulation groove is provided with a first support protrusion.

[0012] In the above scheme, since the second sealed cavity is a vacuum environment with an internal pressure much lower than the external atmospheric pressure, it will exert inward pressure on the insulation board and the first cover plate. Over time or under the influence of external installation forces, this can easily lead to problems such as dents and deformation. By setting a first support protrusion as a rigid support structure between the insulation board and the first cover plate, the pressure generated by the vacuum pressure difference can be absorbed, effectively preventing the insulation board and the first cover plate from collapsing due to pressure deformation. This ensures the stability of the vacuum cavity shape of the second sealed cavity, thereby guaranteeing the reliability of the insulation effect.

[0013] Optionally, in one possible implementation, the second side of the first cover plate is provided with a second support protrusion, one side surface of the capillary structure is attached to the second cover plate, and the other side surface is in contact with the second support protrusion.

[0014] In the above scheme, the second support protrusion serves as a rigid support structure between the heat insulation plate and the first cover plate, effectively preventing the heat insulation plate and the first cover plate from collapsing due to pressure deformation, ensuring the stability of the vacuum cavity shape of the first closed cavity, and at the same time, it can also apply force to the capillary structure to ensure that the capillary structure maintains a stable spreading shape in the first closed cavity, ensuring the continuous performance of the core reflux function of the capillary structure.

[0015] Alternatively, in one possible implementation, the second cover plate is provided with a second recess, which is recessed in a direction away from the first enclosed chamber.

[0016] In the above scheme, the second cover plate is provided with a second concave. The second concave forms a protruding structure on the side of the second cover plate away from the first closed chamber, which is used to fit and contact the heating element. The contour of the second concave is adapted to the shape of the heating element, which can more effectively dissipate heat from the heating element and improve the heat dissipation effect.

[0017] Optionally, in one possible implementation, the capillary structure has a capillary recess, the first cover plate has a first recess, the positions of the capillary recess and the first recess correspond to the positions of the second recess, and the recess direction is the same as the recess direction of the second recess.

[0018] In the above scheme, the position and size of the capillary concave and the first concave correspond to the position and size of the second concave to compensate for the spacing deviation caused by the second concave, so that the thickness distribution inside the first closed chamber is uniform and the consistency and stability of the working fluid circulation are guaranteed.

[0019] Optionally, in one possible implementation, the capillary structure has a reflux hole, and the first cover plate has a protrusion that cooperates with the reflux hole. The protrusion protrudes toward the capillary structure and passes through the reflux hole.

[0020] In the above scheme, a gap is reserved between the protrusion and the wall of the reflux hole. This gap allows the liquid working fluid to reflux, thus playing an auxiliary role in reflux. Combined with the micropores on the capillary structure, it can effectively improve the reflux rate of the liquid working fluid. At the same time, the gaseous working fluid can also diffuse across regions through the gap between the protrusion and the reflux hole, thereby reducing the resistance to gas phase flow and facilitating the complete phase change cycle of the working fluid.

[0021] Optionally, in one possible implementation, both the first cover plate and the second cover plate are made of metal.

[0022] In the above scheme, the metal material has excellent thermal conductivity and mechanical strength, which can effectively transfer heat while ensuring structural strength.

[0023] Optionally, in one possible implementation, the working medium is one of water, acetone, alcohols, or aqueous solutions of alcohols.

[0024] In the above scheme, the working medium is selected from water, acetone, alcohol, or aqueous alcohol solution, and the specific selection is based on the degree of matching between its physical properties and the working temperature range of the heat spreader.

[0025] Compared with the prior art, the beneficial effects of this application are as follows: This application utilizes a heat insulation plate and a first cover plate and / or a second cover plate to form a vacuum-sealed second chamber. Leveraging the excellent thermal insulation properties of a vacuum, heat conduction is blocked, significantly reducing the surface temperature of the heat insulation plate area compared to other areas of the heat spreader. This achieves localized temperature control of the heat spreader, effectively preventing high surface temperatures from affecting the normal operation of surrounding electronic components. Simultaneously, the first and second sealed chambers are independently configured, ensuring that heat dissipation and insulation functions do not interfere with each other. This balances the heat spreader's efficient heat dissipation requirements for heat-generating components with its thermal insulation protection requirements for surrounding components, resulting in a rational overall structural design. Furthermore, the position and number of heat insulation plates can be adjusted according to the position and number of surrounding electronic components requiring protection, offering high flexibility and effectively adapting to various practical application scenarios for electronic devices. Attached Figure Description

[0026] 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.

[0027] Figure 1 This is a perspective view of a heat spreader according to an embodiment of the present invention.

[0028] Figure 2 for Figure 1Exploded view of the heat spreader in the image.

[0029] Figure 3 This is a structural schematic diagram of the second side of the first cover plate.

[0030] Figure 4 for Figure 3 A magnified view of area A in the middle.

[0031] Figure 5 This is a schematic diagram of the structure of the insulation board near the insulation groove.

[0032] Explanation of the reference numerals in the figure: 1-First cover plate; 11-Insulation groove; 12-First concave; 13-Second support protrusion; 14-Protrusion; 2-Second cover plate; 21-Groove; 22-Second concave; 3-Capillary structure; 31-Capillary concave; 32-Return hole; 4-Insulation plate; 41-First support protrusion. Detailed Implementation

[0033] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein.

[0034] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0035] Please refer to Figures 1 to 5 This embodiment provides a heat spreader with adjustable surface temperature, including a first cover plate 1, a second cover plate 2, a capillary structure 3 and a heat insulation plate 4. A first closed chamber is formed between the first cover plate 1 and the second cover plate 2, and the first closed chamber is filled with a working fluid. The capillary structure 3 is located in the first closed chamber. A second closed chamber is formed between the heat insulation plate 4 and the first cover plate 1. Both the first closed chamber and the second closed chamber are in a vacuum environment.

[0036] Specifically, the first cover plate 1 and the second cover plate 2, when combined, form a sealed first enclosed chamber. This first enclosed chamber is a vacuum environment, and its interior contains a capillary structure 3 and a working fluid. The working fluid absorbs heat from the heat source in the heat-absorbing zone and evaporates. The gaseous working fluid diffuses to the heat-releasing zone, releases heat, and condenses into a liquid state. The capillary structure 3, relying on its own capillary force, drives the condensed liquid working fluid to flow directionally back to the heat-absorbing zone, completing the full phase change cycle of the working fluid. This continuously and efficiently removes heat from the heat source, achieving heat dissipation. A second enclosed chamber is formed between the heat insulation plate 4 and the first cover plate 1. The interior of this second enclosed chamber is a vacuum environment. In this vacuum state, heat transfer is significantly blocked, providing excellent heat insulation performance. This effectively blocks the heat transfer from the heat spreader to the heat insulation plate 4, making the surface temperature of the heat insulation plate 4 area significantly lower than the surface temperature of other areas of the heat spreader. This design enables temperature control of localized areas of the heat spreader, preventing excessively high surface temperatures from interfering with or affecting the normal operation of surrounding electronic components.

[0037] It is worth mentioning that a liquid injection hole (not shown in the figure) is formed between the first cover plate 1 and the second cover plate 2, and a vent hole (not shown in the figure) is formed between the heat insulation plate 4 and the first cover plate 1. After the first cover plate 1, the second cover plate 2 and the heat insulation plate 4 are assembled, the first closed chamber and the second closed chamber are evacuated through the liquid injection hole and the vent hole, respectively. After the first closed chamber is evacuated, the working medium is injected into the first closed chamber through the liquid injection hole. Then the liquid injection hole and the vent hole are sealed to achieve the sealing of the first closed chamber and the second closed chamber.

[0038] In this embodiment, the first cover plate 1 includes a first side and a second side facing each other. The second side of the first cover plate 1 and the second cover plate 2 form a first closed chamber. The first side of the first cover plate 1 is provided with a heat insulation groove 11 that cooperates with the heat insulation plate 4. The heat insulation plate 4 and the heat insulation groove 11 cooperate to form a second closed chamber.

[0039] according to Figure 2 As shown in the directions, the first surface is the upper surface of the first cover plate 1, and the second surface is the lower surface of the first cover plate 1.

[0040] Specifically, the second surface of the first cover plate 1 and the second cover plate 2 form a first closed chamber. The heat insulation groove 11 is located on the first surface of the first cover plate 1 and is recessed towards the first closed chamber so as to cooperate with the heat insulation plate 4 to form a second closed chamber. The first closed chamber and the second closed chamber are located on both sides of the first cover plate 1, and are independent of each other and do not interfere with each other.

[0041] It should be understood that the shape of the heat insulation plate 4 corresponds to that of the heat insulation groove 11, and can be circular, elliptical or other polygonal shapes, which can be flexibly set according to actual needs.

[0042] In addition, the surface of the second cover plate 2 near the first closed chamber is provided with a groove 21 corresponding to the heat insulation groove 11. The groove 21 is in the same direction as the heat insulation groove 11. It is used to compensate for the uneven spacing inside the first closed chamber caused by the heat insulation groove 11, so that the thickness of each part inside the first closed chamber is kept uniform, so as to ensure the consistency and stability of the working fluid circulation in each area inside.

[0043] In this embodiment, only one heat insulation plate 4 is provided to protect the electronic components in the corresponding area. In other embodiments, multiple heat insulation plates 4 may be provided, and their specific positions and numbers are adjusted according to the distribution positions and numbers of the components to be protected. When multiple heat insulation plates 4 are provided, correspondingly, multiple heat insulation grooves 11 are also provided, with each heat insulation groove 11 corresponding to the installation of one heat insulation plate 4.

[0044] It should be noted that this arrangement in this embodiment is based on the premise that the heat spreader is located between the heat source and the component to be protected. In this installation layout, the second cover plate 2 is in contact with the heat source to absorb the generated heat, and the heat insulation plate 4 is arranged in the area where the component to be protected is located (i.e., on one side of the first cover plate 1) to provide heat insulation protection. In other embodiments, depending on the internal installation layout of the electronic device and the area of ​​the component to be protected, the heat insulation groove 11 can be set on the second cover plate 2. The heat insulation plate 4 and the heat insulation groove 11 set on the second cover plate 2 cooperate to form a second closed chamber to provide heat insulation protection for the area on the same side as the heat source.

[0045] In this embodiment, the second cover plate 2 is provided with a second recess 22, which is recessed in a direction away from the first closed chamber. The capillary structure 3 is provided with a capillary recess 31, and the first cover plate 1 is provided with a first recess 12. The positions of the capillary recess 31 and the first recess 12 correspond to the positions of the second recess 22, and the recess direction is the same as the recess direction of the second recess 22.

[0046] Specifically, the second cover plate 2 is provided with a second recess 22. The second recess 22 forms a protruding structure on the side of the second cover plate 2 away from the first closed chamber, for contact with the heat source. The contour of the second recess 22 is adapted to the shape of the heat source, which can more effectively dissipate heat and improve the heat dissipation effect. The position and size of the capillary recess 31 and the first recess 12 correspond to the position and size of the second recess 22 to compensate for the internal spacing deviation caused by the recess of the second recess 22, so as to make the thickness distribution inside the first closed chamber uniform and ensure the consistency and stability of the working fluid circulation in each area inside.

[0047] It should be noted that in this embodiment, the projections of the first recess 12, the second recess 22, and the capillary recess 31 in the thickness direction fall within the area of ​​the heat insulation plate 4. Since the heat source is in contact with the second recess 22, the temperature of the position of the first cover plate 1 corresponding to the second recess 22 in the thickness direction will be relatively high, so it is necessary to focus on heat insulation in this area. In some other embodiments, the positions of the heat source and the component to be protected may be misaligned in the thickness direction. Therefore, the first recess 12, the second recess 22, and the capillary recess 31 can also be set in other positions, and they do not necessarily have to correspond to the heat insulation plate 4 in the thickness direction.

[0048] In this embodiment, the surface of the heat insulation plate 4 near the heat insulation groove 11 is provided with a first support protrusion 41.

[0049] Because the second sealed cavity is a vacuum environment, its internal air pressure is much lower than the external atmospheric pressure, which will exert inward pressure on the heat insulation plate 4 and the first cover plate 1. Under long-term exposure or the influence of external installation forces, problems such as dents and deformation are likely to occur. By setting the first support protrusion 41 as a rigid support structure between the heat insulation plate 4 and the first cover plate 1, the pressure generated by the vacuum pressure difference can be borne, effectively preventing the heat insulation plate 4 and the first cover plate 1 from collapsing due to deformation under pressure, ensuring the stability of the vacuum cavity shape of the second sealed cavity, and thus ensuring the reliability of the heat insulation effect.

[0050] Among them, such as Figure 5 As shown, the height of the first support protrusion 41 in the region corresponding to the capillary concave 31 is higher than the height of the first support protrusion 41 in other regions, so that it can contact the capillary concave 31, thereby preventing the region from collapsing or deforming due to insufficient support.

[0051] In this embodiment, a second support protrusion 13 is provided on the second surface of the first cover plate 1, one side surface of the capillary structure 3 is attached to the second cover plate 2, and the other side surface is in contact with the second support protrusion 13.

[0052] The second support protrusion 13 serves as a rigid support structure between the heat insulation plate 4 and the first cover plate 1, effectively preventing the heat insulation plate 4 and the first cover plate 1 from collapsing due to pressure deformation, ensuring the stability of the vacuum cavity shape of the first closed cavity, and at the same time, providing a certain holding force for the capillary structure 3 to ensure that the capillary structure 3 maintains a stable spreading shape in the first closed cavity, and ensuring the continuous performance of the core reflux function of the capillary structure 3.

[0053] It should be understood that, such as Figure 3 As shown, a second support protrusion 13 is also provided on the side surface of the first concave 12 near the second cover plate 2 to match the concavity of the capillary concave 31 and the second concave 22, thereby playing a supporting role.

[0054] It should be noted that in this embodiment, the first support protrusion 41 and the heat insulation plate 4, and the second support protrusion 13 and the first cover plate 1 are integrally formed or separately connected; the integrally formed design can ensure that the connection between the protrusion and the cover plate is more secure, reducing the performance degradation caused by loose connection; while the separate connection provides more flexibility, allowing the protrusion to be replaced or adjusted according to specific needs, thereby adapting to different heat dissipation environments.

[0055] Furthermore, the shape of the first support protrusion 41 includes, but is not limited to, a linear, dot-shaped, frustum-shaped, cylindrical, polygonal, or a combination thereof. The shape of the second protrusion includes, but is not limited to, a linear, dot-shaped, frustum-shaped, cylindrical, polygonal, or a combination thereof.

[0056] Preferably, in this embodiment, the first support protrusion 41 and the second support protrusion 13 are dot-shaped. In other embodiments, they can be line-shaped, frustum-shaped, cylindrical, polygonal, or even a free combination of the aforementioned shapes.

[0057] In this embodiment, the capillary structure 3 has a reflux hole 32, and the first cover plate 1 has a protrusion 14 that cooperates with the reflux hole 32. The protrusion 14 protrudes toward the capillary structure 3 and passes through the reflux hole 32.

[0058] Specifically, a gap is reserved between the protrusion 14 and the wall of the reflux hole 32. This gap allows the liquid working fluid to reflux, thus playing an auxiliary role in reflux. Combined with the micropores on the capillary structure 3, it can effectively improve the reflux rate of the liquid working fluid. At the same time, the gaseous working fluid can also diffuse across regions through the gap between the protrusion 14 and the reflux hole 32, thereby reducing the resistance to gas phase flow and facilitating the complete phase change cycle of the working fluid.

[0059] In this embodiment, the capillary structure 3 is a porous structure formed by sintering metal powder. In other embodiments, it can also be a mesh structure woven from several metal wires.

[0060] In this embodiment, both the first cover plate 1 and the second cover plate 2 are made of metal, and the materials are identical. Metal materials have excellent thermal conductivity and mechanical strength, which can effectively transfer heat while ensuring structural strength. Specifically, copper, aluminum, or stainless steel materials can be selected.

[0061] In this embodiment, the working fluid is selected from water, acetone, alcohols, and aqueous solutions of alcohols. Water has high thermal conductivity and high latent heat of vaporization, making it suitable for medium- and high-temperature heat dissipation scenarios. Its high latent heat of vaporization can improve the heat transfer efficiency per unit volume. Acetone has a low boiling point and high volatility, making it suitable for low-temperature or rapid heat dissipation requirements. Its low boiling point can accelerate the phase change cycle rate. Alcohols achieve a balance between surface tension and viscosity, which helps reduce flow resistance and maintain stable capillary reflux. The selection of these working fluids is based on their physical properties and their compatibility with the operating temperature range of the heat exchanger, and no specific restrictions are imposed here.

[0062] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only 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. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0063] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0064] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The various embodiments can be combined as needed, and the same or similar parts can be referred to each other.

[0065] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heat spreader with adjustable surface temperature, characterized in that, It includes a first cover plate, a second cover plate, a capillary structure, and a heat insulation plate. A first closed chamber is formed between the first cover plate and the second cover plate. The first closed chamber is filled with a working fluid. The capillary structure is located in the first closed chamber. A second closed chamber is formed between the heat insulation plate and the first cover plate, and / or the second cover plate. Both the first closed chamber and the second closed chamber are in a vacuum environment.

2. The heat spreader with adjustable surface temperature according to claim 1, characterized in that, The first cover plate includes a first side and a second side facing each other. The second side of the first cover plate and the second cover plate together form the first closed chamber, and the heat insulation plate and the first side of the first cover plate together form the second closed chamber.

3. The heat spreader with adjustable surface temperature according to claim 2, characterized in that, The first cover plate has a heat insulation groove on its first side that cooperates with the heat insulation plate, and the heat insulation plate and the heat insulation groove cooperate to form the second closed chamber.

4. The heat spreader with adjustable surface temperature according to claim 3, characterized in that, The surface of the heat insulation plate near the heat insulation groove is provided with a first support protrusion.

5. The heat spreader with adjustable surface temperature according to claim 2, characterized in that, The second side of the first cover plate is provided with a second support protrusion. One side surface of the capillary structure is attached to the second cover plate, and the other side surface is in contact with the second support protrusion.

6. The heat spreader with adjustable surface temperature according to claim 1, characterized in that, The second cover plate has a second recess, which is recessed in a direction away from the first closed chamber.

7. The heat spreader with adjustable surface temperature according to claim 6, characterized in that, The capillary structure has a capillary concave portion, and the first cover plate has a first concave portion. The positions of the capillary concave portion and the first concave portion correspond to the positions of the second concave portion, and the concave direction is the same as the concave direction of the second concave portion.

8. The heat spreader with adjustable surface temperature according to claim 1, characterized in that, The capillary structure has a reflux hole, and the first cover plate has a protrusion that cooperates with the reflux hole. The protrusion protrudes toward the capillary structure and passes through the reflux hole.

9. The heat spreader with adjustable surface temperature according to claim 1, characterized in that, Both the first cover plate and the second cover plate are made of metal.

10. The heat spreader with adjustable surface temperature according to claim 1, characterized in that, The working medium is one of water, acetone, alcohol, or aqueous solution of alcohol.

Images