Composite uniform temperature plate

Abstract

The utility model discloses a composite uniform temperature plate which comprises a first cover plate and a second cover plate, the first cover plate and the second cover plate are oppositely covered and combined to form an airtight space together, and one face, in the airtight space, of the second cover plate is fixedly connected with wave-shaped fins. The bionic vein capillary groove structure is arranged in the airtight space and formed on the inner wall of the second cover plate and the surface of the wavy fin; the liquid injection port is formed in the first cover plate or the second cover plate and is communicated with the airtight space; the airtight space is filled with the working medium through the liquid injection opening; according to the composite vapor chamber, the flowability of gas-phase and liquid-phase working media is greatly improved in a limited space, the heat dissipation area is increased, the phase change heat conduction efficiency is improved, and heat is dissipated in time.

Description

Technical Field

[0001] The utility model relates to the technical field of radiators, in particular to a composite temperature equalizing plate. Background Art

[0002] In recent years, electronic devices have been increasingly miniaturized, high-performance, and integrated. The high heat generation of electronic devices increases their temperature, resulting in a decrease in performance. Studies have shown that when the operating temperature of electronic devices is at high temperature for a long time, their reliability will be significantly reduced by 50%. Effectively solving the heat dissipation problem of electronic devices has become one of the keys to the development of current electronic technology. As a good thermal conductive device, the heat spreader can make the heat flux generated by the heat source of the electronic device tend to be uniform. Its thermal conductivity can be as high as hundreds of times that of pure copper. It transfers heat by changing the vapor and liquid phases of the circulating medium in a fully enclosed vacuum cavity. It is often used in small electronic products with fast heat dissipation, as well as other application scenarios with high heat dissipation requirements. However, due to the limited internal space of the existing heat spreader, the fluidity of the gas and liquid working media is very poor, the heat dissipation area is small, the phase change thermal conductivity efficiency is low, and the heat cannot be dissipated in time. Therefore, the existing heat spreader still has a lot of room for improvement. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a composite temperature equalizing plate, including:

[0004] first cover plate;

[0005] a second cover plate, the second cover plate and the first cover plate are relatively covered and together form an airtight space, and a wavy fin is fixedly connected to one side of the second cover plate in the airtight space;

[0006] The bionic leaf vein capillary groove structure is arranged in the airtight space and formed on the inner wall of the second cover plate and the surface of the wavy fin;

[0007] A liquid injection port, provided on the first cover plate or the second cover plate and communicated with the airtight space;

[0008] The working medium is filled into the airtight space through the liquid injection port.

[0009] Furthermore, the corrugated fin comprises at least one crest and one trough, and the height difference between the crest and the trough is 0.2 to 6 mm.

[0010] Furthermore, the trough is in the shape of a quadratic parabola function opening upward.

[0011] Furthermore, the wave crest is in the shape of a quadratic parabola function opening downward.

[0012] Furthermore, the two side surfaces of the corrugated fins along the length direction thereof are also arranged as corrugated surfaces, so that corrugated gas-phase and liquid-phase working medium flow channels are formed between adjacent corrugated fins.

[0013] Furthermore, windows for disturbing and diverting air are arranged on two side surfaces of the corrugated fin along its length direction.

[0014] Furthermore, the bionic leaf vein capillary groove structure takes the center point of the second cover plate as the starting point and presents a spider web structure.

[0015] Furthermore, a graphite composite film is provided on the inner wall of the first cover plate, and the graphite composite film includes a first copper-aluminum alloy heat sink, a graphene powder layer, a second copper-aluminum alloy heat sink, a first graphite sheet layer, a copper foil layer, and a second graphite sheet layer stacked in sequence from bottom to top. The first copper-aluminum alloy heat sink and the second copper-aluminum alloy heat sink are bonded to each other at their edges by a thermally conductive adhesive layer, and the first graphite sheet layer and the second graphite sheet layer are both provided with mesh holes.

[0016] Furthermore, it also includes a support column, and two ends of the support column are connected to the first cover plate and the second cover plate respectively. The support column can be a solid column made of copper or copper alloy.

[0017] Furthermore, a bionic leaf vein capillary groove structure is also provided on the outer wall of the support column.

[0018] The beneficial effect is that the present application can be attached to electronic devices to cool the electronic devices with the goal of maximum heat exchange and minimum flow resistance. By fixing wavy fins on the inner wall of the second cover plate, turbulence can be generated in the gas phase working medium, so that the working medium can more quickly and fully participate in the phase change cycle heat transfer, further improving the heat transfer performance of the temperature equalizing plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 This is a schematic diagram of the explosion structure of the utility model;

[0021] Figure 2 The trough of the wave-shaped fin is in the shape of a quadratic parabola function with the opening upward;

[0022] Figure 3 The wave crest of the wavy fin is in the shape of a quadratic parabola function with the opening downward;

[0023] In the figure:

[0024] 1. The first cover plate;

[0025] 2. second cover plate; 21. wave-shaped fin; 211. wave crest; 212. wave trough; 213. window; 22. support column;

[0026] 3. Liquid injection port. DETAILED DESCRIPTION

[0027] The following will disclose multiple embodiments of the present invention with drawings. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. In other words, in some embodiments of the present invention, these practical details are not necessary. In addition, in order to simplify the drawings, some conventional structures and components will be depicted in a simple schematic manner in the drawings.

[0028] It should be noted that all directional indications such as up, down, left, right, front, back... in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, in the present utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present utility model. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0030] Example

[0031] See also Figure 1 , Figure 1Schematic diagram of the explosion structure of the utility model. This embodiment provides a composite temperature equalizing plate, including a first cover plate 1 and a second cover plate 2, the first cover plate 1 and the second cover plate 2 are relatively covered and jointly form an airtight space, and a wavy fin 21 is fixedly connected to one side of the second cover plate 2 in the airtight space; a bionic leaf vein capillary groove structure is arranged in the airtight space and formed on the inner wall of the second cover plate 2 and the surface of the wavy fin 21, and the bionic leaf vein capillary groove structure takes the center point of the second cover plate 2 as the starting point and presents a spider web structure; a liquid injection port 3 is arranged on the first cover plate 1 or the second cover plate 2, and the liquid injection port 3 is connected to the airtight space; the working medium is filled into the airtight space through the liquid injection port 3. This composite temperature equalizing plate can be attached to electronic devices to cool them, with the goal of maximum heat exchange and minimum flow resistance. By fixing the wavy fins 21 on the inner wall of the second cover plate 2, turbulence can be generated in the gaseous working medium, so that the working medium can more quickly and fully participate in the phase change cycle heat transfer, further improving the heat transfer performance of the temperature equalizing plate. By setting the bionic leaf vein capillary grooves with a spider web structure, it is beneficial to improve the space utilization rate, ensure that the capillary force of the temperature equalizing plate as a whole reaches the maximum value, the condensation effect of the gaseous working medium reaches the best, and the working medium reflux speed is the fastest.

[0032] See also Figure 2 and Figure 3 , Figure 2 The trough of the wave-shaped fin is in the shape of a quadratic parabola function with the opening upward. Figure 3 The wave crest of the wavy fin is in the shape of a quadratic parabola function with an opening downward. The wavy fin 21 includes at least one wave crest 211 and one wave trough 212, and the height difference between the wave crest 211 and the wave trough 212 is 0.2 to 6 mm. The wavy fin 21 is provided with windows 213 for disturbing and diverting air on both sides along its length direction. By making the fins wavy, the heat exchange area of ​​the fins is increased. By setting the window 213, when the working medium is input into the fin area through the liquid injection port 3, it becomes airflow after being heated and flows through the window in turn, thereby using the window to change the flow direction of the airflow, and interrupting the airflow to continue to form a thermal boundary layer on the side of the fin unit. And because the window 213 has a turbulent effect, the thickness of the thermal boundary layer on the wave surface is greatly reduced, thereby achieving the effect of enhancing heat transfer.

[0033] See also Figure 2 , the trough 212 is in the shape of a quadratic parabola function opening upward. Figure 3 , the crest 211 is in the shape of a quadratic parabola function with an opening downward. The wave-shaped fins 21 of different shapes have different disturbance intensities on the gas-phase working medium. The trough or crest is in the shape of a quadratic parabola function, which can periodically change the flow direction of the gas-phase working medium. This periodic disturbance enhances the turbulence of the gas-phase working medium, strongly disturbs the flow field, and is conducive to the transfer of heat.

[0034] In another embodiment of the present application, the two side surfaces of the wavy fins 21 along their length direction are also set as wavy surfaces, so that a wavy gas flow channel is formed between adjacent wavy fins 21. When the gas-phase working medium flows through the wavy channel, it will be repeatedly deflected and disturbed by the wave structure, so that the disturbance intensity of the gas-phase working medium continues to increase, thereby destroying the boundary layer on the fins to reduce thermal resistance, which is beneficial to the flow of the gas-phase working medium in the wavy channel to enhance heat exchange and conduct away heat in time.

[0035] In another embodiment of the present application, the composite temperature equalizing plate further includes a support column 22, and the two ends of the support column 22 are respectively connected to the first cover plate 1 and the second cover plate 2. A bionic leaf vein capillary groove structure is also provided on the outer wall of the support column 22. The arrangement of the support column 22 can prevent the temperature equalizing plate from becoming flat when vacuuming, or when the working medium in the temperature equalizing plate evaporates into a gaseous state, the gas in the airtight space expands and causes the temperature equalizing plate to bulge.

[0036] In another embodiment of the present application, a graphite composite film is provided on the inner wall of the first cover plate 1, and the graphite composite film includes a first copper-aluminum alloy heat sink, a graphene powder layer, a second copper-aluminum alloy heat sink, a first graphite sheet, a copper foil layer, and a second graphite sheet stacked from bottom to top. The first copper-aluminum alloy heat sink and the second copper-aluminum alloy heat sink are bonded at the edge by a thermally conductive adhesive layer. The first graphite sheet and the second graphite sheet are both provided with mesh holes for easy ventilation, which effectively increases the heat diffusion area and can directly form a better heat dissipation effect on the heat source. Contacting the heat source with this graphite composite film can increase the heat transfer rate of the temperature equalizer, shorten the heat retention time, and improve the heat loss efficiency.

[0037] In summary, the composite temperature equalizing plate provided in the present application greatly increases the fluidity of the gas phase and liquid phase working medium in a limited space, increases the heat dissipation area, improves the phase change thermal conductivity efficiency, and allows the heat to be dissipated in a timely manner.

[0038] The above is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A composite temperature equalizing plate, characterized in that: include: A first cover plate (1); a second cover plate (2), the second cover plate (2) and the first cover plate (1) being arranged to overlap each other and jointly forming an airtight space, and a wavy fin (21) being fixedly connected to one side of the second cover plate (2) in the airtight space; A bionic leaf vein capillary groove structure is arranged in the airtight space and formed on the inner wall of the second cover plate (2) and the surface of the wavy fin (21); A liquid injection port (3) is provided on the first cover plate (1) or the second cover plate (2) and is communicated with the airtight space; The working medium is filled into the airtight space through the liquid injection port (3).

2. The composite temperature equalizing plate according to claim 1, characterized in that: The wave-shaped fin (21) comprises at least one wave crest (211) and one wave trough (212), and the height difference between the wave crest (211) and the wave trough (212) is 0.2 to 6 mm.

3. The composite temperature equalizing plate according to claim 2, characterized in that: The trough (212) is in the shape of a quadratic parabola function opening upward.

4. The composite temperature equalizing plate according to claim 2, characterized in that: The wave crest (211) is in the shape of a quadratic parabola function opening downward.

5. The composite temperature equalizing plate according to claim 1, characterized in that: The two side surfaces of the wavy fin (21) along its length direction are also arranged as wavy surfaces.

6. The composite temperature equalizing plate according to claim 1, characterized in that: The wavy fin (21) is provided with windows (213) for disturbing and diverting air on both sides along its length direction.

7. The composite temperature equalizing plate according to claim 1, characterized in that: The bionic leaf vein capillary groove structure takes the center point of the second cover plate (2) as the starting point and presents a spider web structure.

8. The composite temperature equalizing plate according to claim 1, characterized in that: A graphite composite film is provided on the inner wall of the first cover plate (1), and the graphite composite film comprises a first copper-aluminum alloy heat sink, a graphene powder layer, a second copper-aluminum alloy heat sink, a first graphite sheet layer, a copper foil layer, and a second graphite sheet layer stacked in sequence from bottom to top; the first copper-aluminum alloy heat sink and the second copper-aluminum alloy heat sink are bonded at their edges by a thermally conductive adhesive layer, and the first graphite sheet layer and the second graphite sheet layer are both provided with mesh holes.

9. The composite temperature equalizing plate according to claim 1, characterized in that: It also comprises a support column (22), the two ends of which are respectively connected to the first cover plate (1) and the second cover plate (2).

10. The composite temperature equalizing plate according to claim 9, characterized in that: The bionic leaf vein capillary groove structure is also provided on the outer wall of the support column (22).

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