A method for measuring heat dissipation performance of heat dissipation film based on graphene material

Abstract

The present invention discloses a method for measuring the heat dissipation performance of a graphene material heat dissipation film. The top of each gas tank is open, and a floating plate that can slide up and down is located within the vertical transparent tube. The liquid storage barrels within the gas tanks are evenly distributed with a number of heat dissipation fins, and each heat dissipation fin on the left liquid storage barrel is covered with a heat dissipation film. The top of each liquid storage barrel is connected to the atmosphere. Compressed gas is injected into the two gas tanks, and the floating plates move up a certain distance, so that the two floating plates are at the same height. Heated hot oil is simultaneously injected into the two liquid storage barrels through a mountain-shaped connecting pipe. The hot oil flows simultaneously into the two side pipe sections on the left and right sides and enters each liquid storage barrel. After the liquid level in the middle pipe section stabilizes, the control valve at the bottom of the liquid storage barrel is closed. After the liquid level stabilizes, the floating plates in the two vertical transparent tubes on the left and right sides are observed to rise. The present invention has high measurement accuracy, intuitive and easy-to-understand measurement results, and more specifically and dynamically reflects the heat dissipation performance.

Description

Technical Field

[0001] The present invention relates to the technical field of heat dissipation performance detection of graphene heat dissipation films, and in particular to a method for measuring the heat dissipation performance of a heat dissipation film made of a graphene material. Background Art

[0002] Due to its excellent thermal and electrical conductivity, graphene is considered one of the most ideal heat dissipation materials. Therefore, it is often fabricated into heat dissipation films and applied to the surfaces of heat-generating components to improve heat dissipation and maintain proper functioning of the components. In production, the heat dissipation performance of graphene heat dissipation films is measured by applying the film to a heat-generating power device, providing a consistent heat source by controlling the power of the heat. A thermometer is then installed at a predetermined location near the device, measuring the temperature at a specific time. Based on the temperature changes, the film's heat dissipation performance is determined.

[0003] Current heat dissipation performance measurement methods are not easy to visually ensure that heat-generating components with consistent power consumption are generating consistent heat. Furthermore, it is relatively difficult to determine whether the heat source is essentially the same, which can cause errors in subsequent measurements. Furthermore, the resulting parameterized data makes it difficult to determine the dynamic changes in heat dissipation, and the resulting heat dissipation-time curves do not accurately reflect the heat dissipation status. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In response to the shortcomings of the existing technology, the present invention provides a method for measuring the heat dissipation performance of a heat dissipation film based on graphene material, so as to solve the problem that when measuring the heat dissipation performance of the graphene heat dissipation film, the consistency of the heat source is difficult to grasp and the heat dissipation performance cannot be intuitively and dynamically reflected.

[0006] (2) Technical solution

[0007] To achieve the above object, the present invention provides a method for measuring the heat dissipation performance of a heat dissipation film based on a graphene material, comprising the following steps:

[0008] (1) Two symmetrical gas tanks are placed in a closed room. The top of each gas tank is vertically connected to a vertical transparent tube that is connected to it. The top of the vertical transparent tube is open. A floating plate that can slide up and down and is dynamically sealed with the vertical transparent tube is placed flat on a step inside the vertical transparent tube. A liquid storage barrel is also installed in the center of the gas tank. Several heat dissipation fins are evenly distributed around the liquid storage barrel, and each heat dissipation fin on the left liquid storage barrel is covered with a heat dissipation film made of graphene material. The top of each liquid storage barrel is connected to the outside atmosphere through an air duct; (2) Compressed gas is injected into the two gas tanks, and the floating plate is Move up a certain distance to ensure that the two floats are at the same height; (3) inject heated hot oil into the two liquid storage barrels at the same time through a mountain-shaped connecting pipe. The specific operation is as follows: heat the hot oil to the set temperature, and then inject it from the middle pipe section of the connecting pipe so that the hot oil flows to the two side pipe sections on the left and right sides at the same time, and enters the liquid storage barrel connected to the top of each side pipe section. After the liquid level in the middle pipe section is stable, close the control valve of the side pipe section at the bottom of the liquid storage barrel; (4) Let it stand for a set time and observe the rising of the floats in the two vertical transparent tubes on the left and right sides.

[0009] In the present invention, the heat dissipation fins used are rectangular in shape, and the air guide tubes are made of transparent material. After the hot oil is injected, the oil level of the hot oil should be observed in the two air guide tubes.

[0010] Furthermore, a limiting ring is fixedly connected to the inner wall of the vertical transparent tube near the gas tank, and the upper end surface of the limiting ring serves as the step. When compressed air is not introduced into the two gas tanks, the floating plate is naturally placed flat on the end surface of the limiting ring.

[0011] Furthermore, a plurality of scale lines are provided on the tube walls of the vertical transparent tube and the air guide tube along the vertical direction.

[0012] Furthermore, a guide rod is coaxially installed in the vertical transparent tube, and the floating plate is dynamically sealed and fitted on the guide rod so that the floating plate slides along the guide rod when floating.

[0013] Furthermore, except for the heat dissipation fins, the rest are made of non-heat-conducting materials.

[0014] Furthermore, a temperature sensor is provided between every two adjacent heat dissipation fins, and all temperature sensors are arranged in a circular array with the center of the liquid storage barrel as the center.

[0015] Furthermore, during measurement, the thickness of the heat dissipation films covering the opposite sides of each adjacent pair of heat dissipation fins is consistent. This pair of heat dissipation films constitutes a heat dissipation film group, and along the circumferential direction of the liquid storage barrel, the thickness of the heat dissipation films of the surrounding heat dissipation film group gradually increases or decreases.

[0016] Preferably, a ventilation branch pipe with a smaller diameter than the vertical transparent tube is installed on the top of each vertical transparent tube, and a distance sensor is installed on the inner wall of the top of each vertical transparent tube. The distance sensor detects the distance from the vertical transparent tube to the floating plate and records the transmission distance data.

[0017] Furthermore, the method for injecting equal amounts of compressed gas into the two gas storage tanks on the left and right sides is: the two gas storage tanks are simultaneously injected with compressed gas through another connecting pipe, and when the compressed gas is injected, it is still injected from the middle section of the connecting pipe, and when the two floating plates leave the step and are at the same height, the injection is stopped.

[0018] (3) Beneficial effects

[0019] The present invention provides a method for measuring the heat dissipation performance of a heat dissipation film based on graphene material, which has the following beneficial effects:

[0020] 1. The structure is simple and ingenious. It does not measure a single traditional temperature value, but directly reflects the heat dissipation performance through the floating degree of the floating plate. Compared with professional heat dissipation parameters, it is visible to the naked eye, and the floating speed of the floating plate directly reflects the heat dissipation speed, making the entire measurement result more intuitive and easy to understand.

[0021] 2. The specific measurement of temperature value can be combined to realize dual indicators to measure the heat dissipation performance. In addition, the thickness of the heat dissipation film and its corresponding heat dissipation performance can be conveniently measured during the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the principle of one of the measurement methods of the present invention;

[0023] Figure 2 This is a top view of the heat sink and temperature sensor installed on the liquid storage tank.

[0024] In the figure: gas tank 1, liquid storage barrel 2, heat dissipation fins 3, ventilation pipe 4, vertical transparent tube 5, floating plate 6, step 7, connecting pipe 8, control valve 9, temperature sensor 10, distance sensor 11, ventilation branch pipe 12. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] This embodiment specifically introduces a method for measuring the heat dissipation performance of a heat dissipation film based on graphene material. In actual measurement, Figure 1 As shown, two symmetrical gas cylinders 1 are placed in a sealed chamber. The cylinders 1 can be cylindrical and made of preferably insulating material. A vertical transparent tube 5, such as insulating glass, is vertically connected to the top of each cylinder 1. Furthermore, the top of the vertical transparent tube 5 must remain open. A floating plate 6 that slides up and down, in dynamic sealing engagement, rests on a step 7 within the tube 5. The interior of the tube above the floating plate 6 is open to the atmosphere. Meanwhile, see [the rest of the text]. Figure 1-2 In this embodiment, a liquid storage barrel 2 is further installed in the center of the gas tank 1. A number of heat dissipation fins 3 are evenly distributed around the liquid storage barrel 2, and each heat dissipation fin 3 on the left liquid storage barrel 2 is covered with a heat dissipation film made of graphene material. The thickness of the heat dissipation film is usually small, so the increase in the overall space occupied by the heat dissipation fins 3 caused by the covering is almost negligible, so the surface of the heat dissipation fins 3 in the right liquid storage barrel 2 can be maintained in its original state without treatment. Of course, during measurement, the top of each liquid storage barrel 2 is connected to the outside atmosphere through an air duct to ensure that the oil levels in the two liquid storage barrels 2 are consistent.

[0027] Then, compressed gas is injected into the two gas tanks 1. Specifically, heat-conducting gas is preferably used. When the compressed gas is injected, the floating plate 6 is moved up a certain distance to separate from the above-mentioned step 7, and the heights of the two floating plates 6 are ensured to be consistent, so as to ensure that the compressed volume in the two gas tanks 1 is relatively consistent.

[0028] For the perfusion of hot oil, considering that the heat should be lost as little as possible before entering the liquid storage barrel 2, the speed of equal injection can be accelerated as follows: Figure 1 , heated hot oil is injected into the two liquid storage barrels 2 at the same time through a mountain-shaped connecting pipe 8. The hot oil is first heated to a set temperature, for example, to 200 degrees Celsius, and then injected from the middle pipe section of the connecting pipe 8, so that the hot oil flows to the two side pipe sections on the left and right sides at the same time, and enters the liquid storage barrels 2 connected to the top of each side pipe section. Due to the principle of communicating vessels, when the liquid level in the middle pipe section is stable, it means that the liquid levels in the left and right liquid storage barrels 2 are also stable and consistent. At this time, the control valve 9 at the bottom end of the side pipe section at the liquid storage barrel 2 is quickly closed to prevent heat exchange of the hot oil on the left and right sides. Finally, the system is left to stand for a set time. During this time, due to the heat dissipation effect of the heat dissipation film and the heat dissipation effect of the heat dissipation fins 3, the compressed gas in the gas tank 1 will continue to expand, the pressure will increase, and the floating plate 6 will be pushed upward. Then, the rise of the floating plates 6 in the two vertical transparent tubes 5 on the left and right sides is observed. The floating plate 6 on the left side will definitely rise faster and reach a higher height than the floating plate 6 on the right side, thereby intuitively deriving the heat dissipation performance of the graphene material heat dissipation film. Compared with parameterized comparison, this visual observation is more intuitive and easier to understand to a certain extent.

[0029] In the present invention, the heat dissipation fins 3 are rectangular in shape, and the air ducts are made of transparent material. After the hot oil is injected, the oil level in both air ducts should be observable. This not only ensures the same amount of hot oil based on the principle of communicating vessels, but also allows for direct judgment and verification based on the oil level. For the initial installation of the floating plate 6, a retaining ring is affixed to the inner wall of the vertical transparent tube 5 near the gas tank 1. The upper end surface of the retaining ring serves as the step 7. When compressed air is not flowing into the two gas tanks 1, the floating plate 6 naturally rests flat on the end surface of the retaining ring. Of course, during actual measurement, if the floating plate 6 is heavy, more compressed air will be injected; if it is light, less compressed air will be injected. The injection amount only needs to ensure that the pressure in the gas tank 1 is slightly higher than atmospheric pressure. To facilitate intuitive judgment, several scale lines are provided along the vertical direction on the walls of the vertical transparent tube 5 and the air duct. In addition, a guide rod is coaxially installed in the vertical transparent tube 5, and the floating plate 6 is dynamically sealed and fitted on the guide rod so that the floating plate 6 can slide along the guide rod when floating up, and can slide up better with the thermal expansion of the gas in the gas tank 1.

[0030] In order to concentrate the heat conduction in the gas tank 1 as much as possible, in this embodiment, except for the heat dissipation fins 3, the rest are made of non-heat-conducting materials. Figure 2 To obtain specific parameterized test data, a temperature sensor 10 is provided between each pair of adjacent heat sink fins 3. All temperature sensors 10 are arranged in a circular array centered around the center of the liquid storage barrel 2. The higher the detected temperature, the better the heat dissipation. To simultaneously measure the relationship between heat sink film thickness and corresponding heat dissipation performance, this embodiment uses the same thickness of heat sink film covering the opposing sides of each adjacent pair of heat sink fins 3 during measurement. This pair of heat sink films forms a heat sink film group, and the thickness of the heat sink film surrounding the heat sink film group gradually increases or decreases along the circumference of the liquid storage barrel 2. This allows for the determination of a series of heat dissipation effects corresponding to the corresponding heat sink film thicknesses, facilitating the discovery of the optimal heat sink film thickness.

[0031] Finally, as an optimization implementation method, e.g. Figure 1 A ventilation branch pipe 12 with a smaller diameter than itself is installed on the top of each vertical transparent tube 5 to communicate with the atmosphere. A distance sensor 11 is installed on the inner wall of the top of each vertical transparent tube 5. The distance sensor 11 detects the distance from the floating plate 6 and records the transmission distance data. The recorded distance value represents the degree of thermal expansion of the compressed gas in the gas tank 1, thereby concretely reflecting the heat dissipation performance.

[0032] Similarly, in this embodiment, when injecting equal amounts of compressed gas into the two gas storage tanks 1 on the left and right sides, the two gas storage tanks 1 can be injected with compressed gas simultaneously through the other connecting pipe 8. When injecting compressed gas, it is still injected from the middle section of the connecting pipe 8, and the injection is stopped when the two floating plates leave the step 7 and are at the same height. This can reliably perform equal injection control of compressed gas.

[0033] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0034] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for measuring the heat dissipation performance of a graphene material heat dissipation film, characterized in that: The following steps are involved: T1. Two gas tanks (1) are placed in a closed room, each gas tank (1) is vertically connected to a vertical transparent tube (5) in communication with the gas tank (1), the top of the vertical transparent tube (5) is open, a floating plate (6) that can slide up and down and is in dynamic sealing cooperation with the vertical transparent tube (5) is placed flat on a step (7) in the vertical transparent tube (5), and a liquid storage barrel (2) is installed in the center of the gas tank (1), and a plurality of heat dissipation fins (3) are evenly distributed around the liquid storage barrel (2), and each heat dissipation fin (3) on the left liquid storage barrel (2) is covered with a heat dissipation film made of graphene material, and the top of each liquid storage barrel (2) is connected to the outside atmosphere through an air duct; T2. Inject compressed gas into the two gas tanks (1) and move the floating plate (6) upward by a certain distance to ensure that the two floating plates (6) are at the same height; T3. Inject heated hot oil into the two liquid storage barrels (2) simultaneously through a connecting pipe (8) in the shape of a mountain. The specific operation is as follows: heat the hot oil to a set temperature, and then inject it from the middle pipe section of the connecting pipe (8) so that the hot oil flows simultaneously to the two side pipe sections on the left and right sides, and enters the liquid storage barrels (2) connected to the top end of each side pipe section. After the liquid level in the middle pipe section stabilizes, close the control valve (9) at the bottom end of the side pipe section at the liquid storage barrel (2); T4. Let it stand for a set time and observe the rise of the floating plates (6) in the two vertical transparent tubes (5) on the left and right sides.

2. The method for measuring the heat dissipation performance of a graphene material heat dissipation film according to claim 1, characterized in that: The heat dissipation fins (3) are rectangular in shape, and the air guide tubes are made of transparent material. After the hot oil is injected, the oil level of the hot oil should be observed in the two air guide tubes.

3. The method for measuring the heat dissipation performance of a graphene material heat dissipation film according to claim 2, characterized in that: A limiting ring is fixedly connected to the inner wall of the vertical transparent tube (5) near the gas tank (1), and the upper end surface of the limiting ring serves as the step (7). When compressed air is not introduced into the two gas tanks (1), the floating plate (6) is naturally placed flat on the end surface of the limiting ring.

4. The method for measuring the heat dissipation performance of a graphene material heat dissipation film according to claim 2 or 3, characterized in that: The vertical transparent tube (5) and the air guide tube are both provided with a plurality of scale lines along the vertical direction on their walls.

5. The method for measuring the heat dissipation performance of a heat dissipation film based on graphene material according to claim 4, characterized in that: A guide rod is coaxially installed in the vertical transparent tube (5), and the floating plate (6) is sleeved on the guide rod in a dynamic sealing manner so that the floating plate (6) slides along the guide rod when floating.

6. The method for measuring the heat dissipation performance of a graphene material heat dissipation film according to claim 4, characterized in that: Except for the heat dissipation fins (3), the remaining components are all made of non-heat-conducting materials.

7. The method for measuring the heat dissipation performance of a heat dissipation film based on graphene material according to claim 4, characterized in that: A temperature sensor (10) is provided between each two adjacent heat dissipation fins (3), and all temperature sensors (10) are arranged in a circular array with the center of the liquid storage barrel (2) as the center.

8. The method for measuring the heat dissipation performance of a graphene material heat dissipation film according to claim 7, characterized in that: During measurement, the heat dissipation films covering the opposite sides of each adjacent pair of heat dissipation fins (3) have the same thickness, and the pair of heat dissipation films constitutes a heat dissipation film group. In addition, along the circumferential direction of the liquid storage barrel (2), the thickness of the heat dissipation films of the surrounding heat dissipation film group gradually increases or decreases.

9. The method for measuring the heat dissipation performance of a graphene material heat dissipation film according to claim 1, characterized in that: A ventilation branch pipe (12) with a smaller diameter than the vertical transparent tube (5) is installed on the top of each vertical transparent tube (5), and a distance sensor (11) is installed on the inner wall of the top of each vertical transparent tube (5). The distance sensor (11) detects the distance from the vertical transparent tube to the floating plate (6) and records the transmission distance data.

10. The method for measuring the heat dissipation performance of a graphene material heat dissipation film according to claim 9, characterized in that: An equal amount of compressed gas is injected into the two gas tanks (1) on the left and right sides. The method of injecting the equal amount of compressed gas is as follows: the two gas tanks (1) are simultaneously injected with compressed gas through another connecting pipe (8); when the compressed gas is injected, it is still injected from the middle pipe section of the connecting pipe (8); and when the two floating plates leave the step (7) and are at the same height, the injection is stopped.

Images