Composite heat sink sheet

Abstract

The utility model relates to the field of heat sink piece discloses a kind of composite heat sink piece, including composite heat sink piece body, the inside of composite heat sink piece body includes surface gold layer;The side surface of the surface gold layer is fixedly connected with bottom metal layer, the side surface of the bottom metal layer is fixedly connected with hollow heat dissipation layer, the side surface of the hollow heat dissipation layer is provided with intercommunication heat dissipation groove.The utility model in the present application, the bottom metal layer of the present composite heat sink piece body adopts layered heat dissipation structure design, inside longitudinal arrangement multiple hollow heat dissipation layers, while intercommunication heat dissipation groove is horizontally opened in metal layer interior, significantly improve the overall heat dissipation efficiency of composite heat sink piece body, in addition, still fixed with multiple hollow ventilation layers staggered distribution of hollow heat dissipation layer, through airflow flow away heat conducted by hollow heat dissipation layer, form the double heat dissipation mode of conduction heat dissipation plus convection heat dissipation, further strengthen the heat dissipation effect of composite heat sink piece body.

Description

Technical Field

[0001] This utility model relates to the field of heat sink sheets, and in particular to a composite heat sink sheet. Background Technology

[0002] A heat sink is a functional component used to efficiently conduct heat. Its core function is to quickly absorb and transfer the heat generated by the heat-generating device, preventing localized high temperatures from affecting the performance or lifespan of the equipment.

[0003] Composite heat sinks are high-efficiency heat dissipation components made from a combination of multiple materials. Their core advantage lies in combining the properties of different materials to balance thermal conductivity, weight, and cost, making them suitable for more complex heat dissipation scenarios. They address the shortcomings of single-material heat sinks while meeting the multi-dimensional requirements of equipment for heat dissipation, insulation, and temperature resistance. Compared to traditional single-material heat sinks, they offer greater adaptability and overall performance, making them an important choice for heat dissipation solutions in high-end electronic devices.

[0004] If existing heat sinks have insufficient thermal conductivity, heat will accumulate inside the device, directly leading to performance degradation or even burnout. If the material is prone to aging and cracking, it will damage the integrity of the heat dissipation path and shorten the service life of the equipment. This is especially critical in long-cycle applications such as industrial control and automotive electronics. When the heat-generating device is running at full load, the temperature of the heat sink itself will rise significantly. If the heat resistance limit is too low, the material may soften and deform, not only losing its heat dissipation capacity but also potentially sticking to the device and causing damage. Therefore, a composite heat sink is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a composite heat sink sheet, which aims to improve the problem that if the heat resistance limit of the composite heat sink sheet in the prior art is too low, the material may soften and deform, which not only results in the loss of heat dissipation capacity, but may also cause damage by sticking to the device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a composite heat sink sheet, comprising a composite heat sink sheet body, wherein the interior of the composite heat sink sheet body includes a surface gold layer; a bottom metal layer is fixedly connected to the side of the surface gold layer, a perforated heat dissipation layer is fixedly connected to the side of the bottom metal layer, an interconnected heat dissipation groove is provided on the side of the perforated heat dissipation layer, and a perforated ventilation layer is fixedly connected to the side of the bottom metal layer away from the perforated heat dissipation layer, an interconnected ventilation groove is provided on the side of the perforated ventilation layer.

[0007] As a further description of the above technical solution: multiple hollow heat dissipation layers are fixedly connected to the side of the bottom metal layer.

[0008] As a further description of the above technical solution: each of the hollow heat dissipation layers is provided with an interconnected heat dissipation groove.

[0009] As a further description of the above technical solution: multiple perforated ventilation layers are fixedly connected to the side of the bottom metal layer.

[0010] As a further description of the above technical solution: each of the perforated ventilation layers is provided with an interconnected ventilation slot.

[0011] As a further description of the above technical solution: the hollow heat dissipation layer has a honeycomb hollow shape, and the interconnecting heat dissipation grooves are completely connected to the honeycomb channels of each hollow heat dissipation layer.

[0012] As a further description of the above technical solution: the hollow ventilation layer has a grid-like structure, and the interconnected ventilation grooves are connected to the grid holes of the hollow ventilation layer and the interconnected heat dissipation grooves of the bottom layer.

[0013] This utility model has the following beneficial effects:

[0014] 1. In this utility model, the bottom metal layer of the composite heat sink body adopts a layered heat dissipation structure design, with multiple hollow heat dissipation layers arranged vertically inside. At the same time, interconnected heat dissipation grooves are opened horizontally inside the metal layer. The heat is then accelerated through the interconnected heat dissipation grooves, which significantly improves the overall heat dissipation efficiency of the composite heat sink body. In addition, multiple hollow ventilation layers are fixed and staggered with the hollow heat dissipation layers. The heat conducted by the hollow heat dissipation layers is carried away by the airflow, forming a dual heat dissipation mode of conduction heat dissipation and convection heat dissipation, which further enhances the heat dissipation effect of the composite heat sink body. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of a composite heat sink sheet proposed in this utility model;

[0016] Figure 2 This is a three-dimensional side view of the composite heat sink sheet proposed in this utility model.

[0017] Legend:

[0018] 1. Composite heat sink body; 2. Surface gold layer; 3. Bottom metal layer; 4. Hollowed-out heat dissipation layer; 5. Interconnected heat dissipation groove; 6. Hollowed-out ventilation layer; 7. Interconnected ventilation groove. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Reference Figure 1 - Figure 2 This utility model provides an embodiment of a composite heat sink sheet, comprising a composite heat sink sheet body 1. The materials of the composite heat sink sheet body 1 are vinyl silicone oil, hydrogen-containing silicone oil, chloroplatinic acid, antioxidant, fumed silica, modified nano-alumina, dicumyl peroxide, and nano-silica. The interior of the composite heat sink sheet body 1 includes a surface gold layer 2. A bottom metal layer 3 is fixedly connected to the side of the surface gold layer 2. A perforated heat dissipation layer 4 is fixedly connected to the side of the bottom metal layer 3. Multiple perforated heat dissipation layers 4 are fixedly connected to the side of the bottom metal layer 3. Interconnected heat dissipation grooves 5 are provided on the side of the perforated heat dissipation layers 4. An interconnected heat dissipation groove 5 is provided between each of the perforated heat dissipation layers 4. The perforated heat dissipation layers 4 have a honeycomb perforated shape, and the interconnected heat dissipation grooves 5 are completely connected to the honeycomb channels of each perforated heat dissipation layer 4. This design makes the perforated heat dissipation layers 4 vertically perforated and horizontally connected to the interconnected heat dissipation grooves 5. The three-dimensional heat dissipation channel, multiple hollow heat dissipation layers 4, and the interconnecting heat dissipation groove 5 on the side of each hollow heat dissipation layer 4 improve the overall heat dissipation effect of the composite heat sink body 1. The bottom metal layer 3 is fixedly connected to the side away from the hollow heat dissipation layer 4 with a hollow ventilation layer 6. Multiple hollow ventilation layers 6 are fixedly connected to the side of the bottom metal layer 3. Interconnecting ventilation grooves 7 are provided on the side of the hollow ventilation layer 6. The hollow ventilation layer 6 has a grid structure, and the interconnecting ventilation grooves 7 are connected to the grid holes of the hollow ventilation layer 6 and the interconnecting heat dissipation grooves 5 of the bottom layer. This design allows the hollow ventilation layer 6 and the interconnecting ventilation grooves 7 to guide external airflow into the interior of the heat sink. There is an interconnecting ventilation groove 7 between each hollow ventilation layer 6. The design of multiple hollow ventilation layers 6 and the interconnecting ventilation groove 7 on the side of each hollow ventilation layer 6 allows the hollow ventilation layer 6 to work with the hollow heat dissipation layer 4 to achieve better ventilation and heat dissipation effect.

[0021] Working Principle: The bottom metal layer 3 of the composite heat sink body 1 adopts a layered heat dissipation structure design. Multiple perforated heat dissipation layers 4 are arranged vertically inside, each with a honeycomb-like perforation. Simultaneously, interconnected heat dissipation grooves 5 are horizontally formed inside the metal layers, completely communicating with the honeycomb channels of each perforated heat dissipation layer 4, forming a three-dimensional heat dissipation channel that is both vertically perforated and horizontally interconnected. This structural design significantly increases the heat contact area, allowing the heat absorbed by the bottom metal layer 3 to be quickly dispersed to each perforated layer. The heat is then further transferred laterally through the interconnected heat dissipation grooves 5, significantly improving the overall heat dissipation efficiency of the composite heat sink body 1. In addition, on the side of the bottom metal layer 3 away from the perforated heat dissipation layer 4, multiple perforated ventilation layers 6 are fixed, staggered from the perforated heat dissipation layer 4. The perforated ventilation layers 6 have a grid-like structure, and interconnected ventilation slots 7 are opened between the layers. The interconnected ventilation slots 7 are connected to the grid holes of the perforated ventilation layers 6 and the interconnected heat dissipation slots 5 of the bottom layer, which can guide external airflow into the interior of the heat sink. The airflow carries away the heat conducted by the perforated heat dissipation layer 4, forming a dual heat dissipation mode of conduction heat dissipation and convection heat dissipation, further enhancing the heat dissipation effect of the composite heat sink body 1. The material preparation process for component 1 is as follows: Modified nano-alumina and nano-silica are prepared into solutions, and the two are mixed evenly at a mass ratio of 2:1 for 10-20 minutes. After gelation, aging, and drying, a mixture is obtained. First, vinyl silicone oil, hydrogen-containing silicone oil, chloroplatinic acid, and fumed silica are added to a 500mL reaction vessel and mixed evenly for 5-8 minutes. Then, antioxidants, modified nano-alumina, and the mixture prepared in the previous step are added to the reaction vessel, and the mixture is stirred again. The mixture is stirred evenly for 10-15 minutes to obtain a homogeneous solution. This solution is then added to a two-roll mill and stirred until homogeneous. After stirring evenly, the mixture is passed through a thin mill 8-10 times, rolled into sheets, and placed in a dryer for later use. The compound is left to stand for 24 hours before vulcanization. The compound is then subjected to a first-stage vulcanization on a flat vulcanizing machine, with dicumyl peroxide added for vulcanization. The vulcanization temperature is controlled at 160℃, and the mixture is molded under 10MPa pressure for 10-15 minutes. A second-stage vulcanization is then performed in an oven with forced air to remove any remaining peroxides from the product. The product can be obtained by decomposing the product. The main technical indicators of the composite heat sink body 1 are: thermal conductivity of 3.5 W / m·K and aging time of 126 hours. Thus, the composite heat sink body 1 has good thermal conductivity, aging resistance and heat resistance. It is mainly used in the domestic avionics application field and can adapt to higher requirements and harsher operating environments. The composite heat sink body 1 can replace similar foreign products while ensuring that the product has excellent thermal conductivity and adjustable thermal expansion coefficient.

[0022] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A composite heat sink sheet, comprising a composite heat sink sheet body (1), characterized in that: The interior of the composite heat sink body (1) includes a surface gold layer (2); A bottom metal layer (3) is fixedly connected to the side of the surface gold layer (2), and a hollow heat dissipation layer (4) is fixedly connected to the side of the bottom metal layer (3). An interconnected heat dissipation groove (5) is provided on the side of the hollow heat dissipation layer (4). A hollow ventilation layer (6) is fixedly connected to the side of the bottom metal layer (3) away from the hollow heat dissipation layer (4), and an interconnected ventilation groove (7) is provided on the side of the hollow ventilation layer (6).

2. The composite heat sink sheet according to claim 1, characterized in that: The bottom metal layer (3) has multiple hollow heat dissipation layers (4) fixedly connected to its side.

3. The composite heat sink sheet according to claim 1, characterized in that: Each of the hollow heat dissipation layers (4) is provided with an interconnected heat dissipation groove (5).

4. The composite heat sink sheet according to claim 1, characterized in that: The bottom metal layer (3) has multiple perforated ventilation layers (6) fixedly connected to its side.

5. A composite heat sink sheet according to claim 1, characterized in that: Each of the perforated ventilation layers (6) is provided with an interconnected ventilation slot (7).

6. A composite heat sink sheet according to claim 1, characterized in that: The hollow heat dissipation layer (4) has a honeycomb hollow shape, and the interconnecting heat dissipation groove (5) is completely connected to the honeycomb channel of each hollow heat dissipation layer (4).

7. A composite heat sink sheet according to claim 1, characterized in that: The perforated ventilation layer (6) has a grid structure, and the interconnected ventilation grooves (7) are connected to the grid holes of the perforated ventilation layer (6) and the interconnected heat dissipation grooves (5) of the bottom layer.

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