Liquid cooling film intermediate with runner and liquid cooling film

Abstract

The utility model provides a kind of liquid cooling film intermediate with runner, including bottom film and the cover film being set on the upper surface of bottom film, and the upper surface of bottom film is provided with polyvinyl alcohol printing layer, and hollow runner matched with polyvinyl alcohol printing layer is formed in cover film.Compared with prior art, the utility model provides a kind of liquid cooling film intermediate with runner, fills polyvinyl alcohol printing layer in hollow runner, forms the support to runner top wall, avoids runner collapse, cover film and bottom film are integrally connected, avoid the gap to form leakage, and runner is designed according to polyvinyl alcohol printing layer, so that liquid cooling film has the advantages of flexible runner design, high heat dissipation efficiency, low manufacturing cost etc., especially suitable for large-scale production electronic equipment heat dissipation scene.

Description

Technical Field

[0001] This utility model relates to the field of heat dissipation, and in particular to a liquid cooling film intermediate with flow channels and a liquid cooling film. Background Technology

[0002] Liquid cooling films are high-efficiency thermal management devices based on liquid media (such as water, ethylene glycol, or specialized coolants). They achieve rapid heat transfer through the flow and phase change of the liquid (such as evaporation or condensation). Their core function is to solve heat dissipation problems in high power density, space-constrained environments, or special conditions. They are widely used in electronic equipment, industrial manufacturing, medical technology, and other fields. With the widespread application of new energy sources and the increasing demand for AI computing power, they have broad application prospects.

[0003] Designing flow channels in liquid cooling films is a core aspect of liquid cooling technology. It guides the directional flow of liquid, avoids "short-circuit" effects, increases the heat exchange area, and improves heat transfer efficiency. Currently, flow channels in liquid cooling films are generally formed using three methods: First, compression molding: the film material (or support material) is heated and softened, then pressed into a metal mold (engraved with flow channel patterns), and after cooling, a recessed or raised flow channel structure is formed (suitable for polymer films); second, laser engraving / cutting: flow channel grooves are engraved on the surface of the film material using a laser (high precision, suitable for metal foils or thick polymer films); third, 3D printing pre-forming: for complex flow channels, a 3D printed flow channel skeleton (such as PLA, metal powder) can be first used, and then combined with the film material (suitable for customized, small-batch production). However, the flow channels in liquid cooling films produced by these three methods are formed by combining upper and lower flow channel grooves, which easily leads to gaps between the grooves, causing leakage, and also results in low production efficiency, making them unsuitable for large-scale production. Utility Model Content

[0004] To address the aforementioned problems, this invention provides a liquid-cooled film intermediate with a flow channel. A polyvinyl alcohol printed layer is filled inside the flow channel to support the top wall of the flow channel, preventing the flow channel from collapsing. Furthermore, the side walls and top wall of the hollow flow channel are integrally connected with the bottom film to prevent gaps from forming and causing leakage.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A liquid-cooled film intermediate with flow channels includes a base film and a cover film disposed on the upper surface of the base film. A polyvinyl alcohol printed layer is disposed on the upper surface of the base film, and a hollow flow channel matching the polyvinyl alcohol printed layer is formed inside the cover film.

[0007] Preferably, the molecular weight of polyvinyl alcohol in the polyvinyl alcohol printing layer is 25,000 to 300,000.

[0008] Preferably, the thickness of the partition wall between adjacent channels in the hollow channel is 5-20000 micrometers, the thickness of the top wall of the hollow channel is 5-100 micrometers, and the thickness of the bottom film is 5-5000 micrometers.

[0009] Preferably, the cross-section of the hollow flow channel has a regular geometric shape, which is rectangular or trapezoidal.

[0010] Preferably, the hollow flow channel is coil-shaped, serpentine, mesh-shaped, or fractal.

[0011] Preferably, the inlet and outlet of the hollow flow channel are located on the same side of the cover membrane.

[0012] Preferably, the bottom film and the cover film are made of solid silicone rubber with a Shore hardness range of A 0-80.

[0013] This utility model also provides a liquid cooling film, including a bottom film and a cover film disposed on the upper surface of the bottom film, wherein a hollow flow channel is formed inside the cover film.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides a liquid cooling film intermediate with a flow channel. A polyvinyl alcohol printed layer is filled in the hollow flow channel to form support for the top wall of the flow channel and prevent the flow channel from collapsing. The cover film and the bottom film are integrally connected to prevent gaps from forming and causing leakage. Furthermore, the flow channel is designed according to the polyvinyl alcohol printed layer, which gives the liquid cooling film advantages such as flexible flow channel design, high heat dissipation efficiency, and low manufacturing cost. It is particularly suitable for heat dissipation scenarios of electronic devices in large-scale production. Attached Figure Description

[0015] Figure 1 A schematic diagram of a liquid cooling film intermediate with flow channels provided by this utility model.

[0016] Figure 2 A cross-sectional schematic diagram of a liquid cooling film intermediate with flow channels provided by this utility model.

[0017] Figure 3 This is a schematic diagram of the bottom film of a liquid-cooled film intermediate with flow channels provided by this utility model.

[0018] Figure 4 This is a schematic diagram of the back side of the cover film in a liquid-cooled film intermediate with flow channels provided by this utility model. Detailed Implementation

[0019] The preferred embodiments of this utility model will be described in detail with reference to the accompanying drawings.

[0020] Figures 1 to 4 This is a preferred embodiment of a liquid cooling film with flow channels provided by this utility model. For example... Figures 1 to 4As shown, the liquid cooling film with flow channels includes a base film 10 and a cover film 40 disposed on the upper surface of the base film. A polyvinyl alcohol printed layer 30 is disposed on the upper surface of the base film 10, and a hollow flow channel 20 matching the polyvinyl alcohol printed layer 30 is formed inside the cover film 40. In this way, the polyvinyl alcohol printed layer 30 is filled in the flow channel, which forms a support for the top wall 22 of the flow channel, prevents the hollow flow channel 20 from collapsing, facilitates transportation and storage, and reduces manufacturing costs.

[0021] like Figure 3 and Figure 4 As shown, the polyvinyl alcohol in the polyvinyl alcohol printed layer 30 has a molecular weight of 25,000 to 300,000. During production, polyvinyl alcohol is first printed on the base film 10, and then dried to form the polyvinyl alcohol printed layer 30. The shape of the polyvinyl alcohol printed layer 30 on the upper surface of the base film 10 is the shape of the hollow flow channel 20. Then, liquid silicone rubber is coated onto the base film 10, covering the upper surface of the base film 10 and the polyvinyl alcohol printed layer 30. Finally, it is placed in an oven for baking, allowing the liquid silicone rubber on the surface to adhere. The adhesive cures, and the liquid silicone rubber on the bottom film 10 solidifies into solid silicone rubber, forming a cover film 40. Due to the presence of the polyvinyl alcohol (PVA) printing layer 30, a hollow flow channel 20 is formed within the cover film 40, thus connecting the bottom film 10 and the cover film 40 as a single unit, preventing gaps and leakage. The PVA printing layer 30 completely encapsulates the space between the bottom film 10 and the cover film 40, supporting the top wall of the hollow flow channel 20 and preventing it from collapsing. This facilitates transportation and storage, and reduces manufacturing costs. By setting the PVA printing layer 30 on the upper surface of the bottom film 10, the shape of the hollow flow channel 20 can be designed. This allows for flexible design, high heat dissipation efficiency, and low manufacturing costs, making it particularly suitable for heat dissipation applications in mass-produced electronic devices.

[0022] The thickness H1 of the partition wall between adjacent channels in the hollow flow channel 20 is 5-20000 micrometers, and the thickness H2 of the top wall of the hollow flow channel 20 is 5-100 micrometers. The cross-section of the hollow flow channel 20 has a regular geometric shape, which is rectangular or trapezoidal. The shape of the hollow flow channel 20 can be freely designed according to needs to increase the heat exchange area and improve the heat exchange efficiency. When designing, it is necessary to balance "coverage range", "flow resistance" and "heat exchange uniformity". For example, it can be designed as a coil shape, snake shape, grid shape or fractal shape. The fractal flow channel imitates the natural fractal structure (such as tree branches, blood vessels) and achieves "adaptive distribution" of flow through multi-level branches (main channel → sub-channel → micro-channel) so that the branch flow in the high heat generation area automatically increases. In order to facilitate connection with the pump, the inlet and outlet of the hollow flow channel 20 are located on the same side of the cover membrane 40. This side refers to the side of the cover membrane 40 around the perimeter, not the upper or lower surface of the cover membrane 40.

[0023] The thickness of the substrate 10 is 5-5000 micrometers. The substrate 10 is made of solid silicone rubber with a Shore hardness range of A 0-80, and serves as a support carrier.

[0024] This invention also provides a liquid cooling film, including a base film 10 and a cover film 40 disposed on the upper surface of the base film 10, with a hollow flow channel 20 formed within the cover film 40. Polyvinyl alcohol (PVA) is an important water-soluble polymer. The liquid cooling film can be formed by exposing both ends of the hollow flow channel 20 within the liquid cooling film intermediate, immersing it in water, and then removing the polyvinyl alcohol printing layer 30 inside the hollow flow channel 20 by washing with water, resulting in a completely hollow flow channel 20, which becomes the final product, the liquid cooling film.

[0025] In summary, the technical solution of this utility model can fully and effectively achieve the aforementioned objectives. Furthermore, the structure and functional principles of this utility model have been fully verified in the embodiments, achieving the expected effects and objectives. Without departing from the principles and essence of this utility model, various changes or modifications can be made to the embodiments. Therefore, this utility model includes all substitutions within the scope mentioned in the patent application claims, and any equivalent changes made within the scope of this patent application are within the scope of the patent application.

Claims

1. A liquid-cooled film intermediate with flow channels, characterized in that, It includes a base film and a cover film disposed on the upper surface of the base film. A polyvinyl alcohol printing layer is disposed on the upper surface of the base film, and a hollow flow channel matching the polyvinyl alcohol printing layer is formed inside the cover film.

2. The liquid-cooled film intermediate with flow channels according to claim 1, characterized in that: The polyvinyl alcohol in the polyvinyl alcohol printing layer has a molecular weight of 25,000 to 300,000.

3. The liquid-cooled film intermediate with flow channels according to claim 1, characterized in that: The thickness of the partition wall between adjacent channels in the hollow channel is 5-20000 micrometers, the thickness of the top wall of the hollow channel is 5-100 micrometers, and the thickness of the bottom film is 5-5000 micrometers.

4. The liquid-cooled film intermediate with flow channels according to claim 1, characterized in that: The cross-section of the hollow flow channel is rectangular or trapezoidal.

5. The liquid-cooled film intermediate with flow channels according to claim 1, characterized in that: The hollow flow channel is in the shape of a coil, snake, grid, or fractal.

6. The liquid-cooled film intermediate with flow channels according to claim 1, characterized in that: The bottom film and the cover film are made of solid silicone rubber with a Shore hardness range of A 0-80.

7. The liquid-cooled film intermediate with flow channels according to claim 1, characterized in that: The inlet and outlet of the hollow flow channel are located on the same side of the cover membrane.

8. A liquid cooling film, characterized in that, It includes a base membrane and a cover membrane disposed on the upper surface of the base membrane, with a hollow flow channel formed inside the cover membrane.

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