Flexible heat dissipation device and preparation method

Abstract

The invention relates to the technical field of heat dissipation structures, and discloses a flexible heat dissipation device and a preparation method, the flexible heat dissipation device comprises a heat dissipation outer plate and a heat dissipation rough plate, the main body of the heat dissipation outer plate is a plate body, the top surface of the plate body is provided with a plurality of uniformly distributed convex holes, the bottom surface of the plate body is provided with a surrounding cavity, and the heat dissipation rough plate comprises a heat exchange plate and heat exchange bristles. The heat exchange plate is located in the surrounding cavity, and the heat exchange bristles penetrate through the convex holes and are erected on the top face of the plate body. The heat exchange area is increased through the heat exchange bristles, the heat exchange bristles can elastically deform under the action of airflow, and the impact force of the airflow can be buffered through elastic deformation. The fins continuously swing in a flow field, and the deformed heat exchange bristles enable a flow channel through which airflow passes to be changed, so that fluid is promoted to form sufficient turbulent flow. Furthermore, the heat exchange wool is naturally bent in the flowing process and can automatically adapt to the flow field condition, the form with the minimum resistance is formed, and therefore unnecessary flowing losses are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of heat dissipation structures, and specifically to a flexible heat dissipation device and a preparation method thereof. Background Art

[0002] The heat dissipation problem is a key issue in the application of renewable energy. Devices such as fuel cells will release a large amount of energy during operation. If the heat is not released in time, it will seriously affect the operation of the device and even lead to accidents.

[0003] Fins are a commonly used type of heat conduction enhancement device. By increasing the heat dissipation area and changing the fluid flow pattern, fins can significantly enhance the heat transfer performance of the solid surface. The article "Numerical Simulation of Flow and Heat Transfer in a Water Droplet-Shaped Ribbed Channel" published by Yang Chao et al. illustrates the performance of a streamlined ribbed heat exchanger, and through CFD simulation, it is proved that a suitable streamlined fin design can reduce the flow resistance and improve the heat transfer performance at the same time.

[0004] Currently, all fins are designed around a rigid form and lack dynamic characteristics. The rigid form needs to directly bear the frontal impact of the fluid, is easy to break, and has certain limitations on the size. Moreover, the dynamic performance of the rigid form is poor, it is difficult to automatically adjust to a suitable form according to the flow field, and the ability to control and optimize the flow field is limited. Summary of the Invention

[0005] The purpose of the present invention is to provide a flexible heat dissipation device and a preparation method thereof. The flexible material with a Mao structure can naturally bend during flow, automatically adapt to the flow field situation, form a shape with the minimum resistance, thereby reducing unnecessary flow losses. The swinging of the flexible material in the unsteady flow field can promote the full development of turbulence, accelerate heat transfer, and can also achieve rapid batch processing to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A flexible heat dissipation device includes a heat dissipation outer plate and a heat dissipation hair plate; the main body of the heat dissipation outer plate is a plate body, the top surface of the plate body has a number of uniformly distributed convex holes, and the bottom surface of the plate body has an enclosing cavity; the heat dissipation hair plate includes a heat exchange plate and heat exchange hairs, the heat exchange plate is located inside the enclosing cavity, and the heat exchange hairs pass through the convex holes and stand on the top surface of the plate body.

[0007] As a further solution of the present invention: A convex portion is provided at the connection between the heat exchange hair and the heat exchange plate, and the shape of the convex portion matches the inner cavity shape of the convex hole.

[0008] As a further solution of the present invention: A support core rod is arranged inside the heat exchange hair, the support core rod includes a support rod portion and a triangular support portion, the support rod portion is buried at the central axis of the heat exchange hair, and the triangular support portion is located inside the convex portion.

[0009] As a further solution of the present invention: the angle between the inclined surface of the triangular bracket part and the horizontal direction is smaller than the angle between the inclined surface of the inner wall of the convex hole and the horizontal direction.

[0010] As a further solution of the present invention: the number of the triangular bracket parts is at least three, and the triangular bracket parts are equidistantly distributed in a ring shape at the bottom end of the support rod part with the central axis of the support rod part as the center axis.

[0011] As a further solution of the present invention: the heat exchange plate is composed of a first array of hairs and a second array of hairs, the first array of hairs and the second array of hairs are both distributed in a matrix, the array spacing of the first array of hairs and the second array of hairs are the same, and the first array of hairs and the second array of hairs are staggered.

[0012] A method for preparing a flexible heat dissipation device includes: step S1: processing the convex hole and the surrounding cavity on the plate body through a stamping process, and removing burrs.

[0013] Step S2: The plate body is used as a relay mold and clamped between the upper mold and the lower mold. The convex hole is inserted into the top of the hair cavity. The hair cavity and the convex hole cooperate to form the molding cavity of the heat exchange hair.

[0014] Step S3: The cavity of the upper mold is connected to the surrounding cavity, and silicone melt is injected into the upper mold and pressurized. Under the influence of pressure, the silicone melt passes through the surrounding cavity and the convex hole and enters the burr cavity to cool and form.

[0015] Step S4: the plate body is separated from the lower mold to obtain the heat exchange hair, and the upper mold is separated from the plate body to obtain the heat exchange plate.

[0016] As a further solution of the present invention: step S2 is replaced by step S2a, step S2a: the convex hole is placed vertically downward, the supporting core rod is inserted into the convex hole in turn, the triangular bracket part is in contact with the inner wall of the convex hole for support, the support rod part is located at the central axis of the burr cavity, the plate body is used as a relay mold to be clamped between the upper mold and the lower mold, the convex hole is inserted into the top end of the burr cavity, and the burr cavity and the convex hole cooperate to form the molding cavity of the heat exchange burr.

[0017] As a further solution of the present invention: the separation step of the plate body and the lower mold in step S4 is: separating the lower mold from the bottom to the top in sequence, specifically: separating the closed bottom plate from the sandwich plate, switching the closed end of the hair cavity to an open state, and then separating the sandwich plates one by one until the separation of the sandwich plate and the contoured top plate is completed, and finally separating the contoured top plate from the plate body.

[0018] As a further solution of the present invention: a conical hole fitting the convex hole is formed at the top of the profiling top plate, a top exhaust channel is arranged at the contact surface between the conical hole and the convex hole, a bottom exhaust channel is arranged on the surface of the closed bottom plate, and the bottom exhaust channel communicates with the cavity end of the hair part cavity.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: the heat exchange hairs increase the heat exchange area, and the heat exchange hairs will undergo elastic deformation under the action of air flow, and the elastic deformation can buffer the impact force of the air flow. The fins will continuously swing in the flow field, and the deformed heat exchange hairs will change the flow channels through which the air flow passes, thereby promoting the formation of sufficient turbulence in the fluid. Further, the heat exchange hairs are naturally bent during flow, can automatically adapt to the flow field conditions, and form a shape with the least resistance, thereby reducing unnecessary flow losses.

[0020] On the basis of the above advantages, the structure is improved so that the processing of the heat exchange device can be coupled with the mold to achieve mass production, and while adjusting the strength of the heat exchange hairs according to the actual situation, rapid mass production can still be achieved. The processing speed is faster than that of cutting fins and welding fins. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a three-dimensional schematic diagram of a flexible heat dissipation device.

[0023] Figure 2 It is a three-dimensional schematic diagram of a heat dissipation hair plate in a flexible heat dissipation device.

[0024] Figure 3 It is a distribution schematic diagram of heat exchange hairs in a flexible heat dissipation device.

[0025] Figure 4 It is a cross-sectional schematic diagram of a flexible heat dissipation device.

[0026] Figure 5 It is a three-dimensional schematic diagram of a flexible heat dissipation device with a support core rod added.

[0027] Figure 6 It is a schematic diagram of the instrument used in the manufacturing process of a flexible heat dissipation device.

[0028] Figure 7 It is Figure 5 an enlarged schematic diagram of part A in

[0029] In the figure: 100, upper die; 200, lower die; 201, profiling top plate; 2011, conical hole; 202, sandwich plate; 203, closed bottom plate; 204, rough part cavity; 205, top exhaust channel; 206, bottom exhaust channel; 1, heat dissipation outer plate; 11, plate body; 12, convex hole; 13, surrounding cavity; 2, heat dissipation rough plate; 21, heat exchange plate; 22, heat exchange rough; 221, first array of rough; 222, second array of rough; 23, convex part; 3, support core rod; 31, support rod part; 32, triangular bracket part. Specific implementation mode

[0030] Example 1: This example relates to a flexible heat dissipation device, and the specific improvements are as follows: In this example, it includes a heat dissipation outer plate 1 and a heat dissipation rough plate 2. The main body of the heat dissipation outer plate 1 is a plate body 11. The top surface of the plate body 11 has a number of uniformly distributed convex holes 12, and the bottom surface of the plate body 11 has a surrounding cavity 13. The heat dissipation rough plate 2 includes a heat exchange plate 21 and a heat exchange rough 22. The heat exchange plate 21 is located inside the surrounding cavity 13, and the heat exchange rough 22 passes through the convex holes 12 and stands on the top surface of the plate body 11.

[0031] Improvement principle: The heat exchange rough 22 is preferably a cylindrical structure, and the heat exchange rough 22 can also be selected in cross-sectional shapes such as sheet bodies and triangles according to requirements. The material of the heat exchange rough 22 is heat-conducting silica gel, and the heat exchange rough 22 stands on the surface of the heat dissipation outer plate 1. The heat dissipation outer plate 1 protects the heat source, and the heat dissipation outer plate 1 can also play a heat exchange function for the heat source. On the basis of the heat dissipation outer plate 1, the heat exchange rough 22 is added. The heat exchange rough 22 increases the heat exchange area, and the heat exchange rough 22 will undergo elastic deformation under the action of air flow. The elastic deformation can buffer the impact force of the air flow. The fins will continuously swing in the flow field, and the deformed heat exchange rough 22 will change the flow channel through which the air flow passes, thereby promoting the formation of sufficient turbulent flow of the fluid. Further, the heat exchange rough 22 naturally bends during the flow, can automatically adapt to the flow field situation, and forms a shape with the least resistance, thereby reducing unnecessary flow losses.

[0032] Further improvement: The problem to be solved by this technical solution is that in order to implement the above structure and enable mass production and processing, the following improvements are made: The main body of the heat dissipation outer plate 1 is a plate body 11, and the plate body 11 has convex holes 12 and a surrounding cavity 13. The convex holes 12 can be formed by stamping, and the surrounding cavity 13 also forms an outward-turning structure through stamping to generate a cavity. The processing by stamping can achieve mass processing, enable the mass production of this structure, and promote the application of this product.

[0033] The heat dissipation rough plate 2 includes a heat exchange plate 21 and a heat exchange rough 22. The more the number of the heat exchange rough 22, the better the heat dissipation effect. The connection between the heat exchange rough 22 and the plate body 11 is a difficult problem. In order to solve this difficult problem, the heat exchange plate 21 is provided.

[0034] Taking the surrounding cavity 13 as a container, injecting silicone melt into the surrounding cavity 13, closing the surrounding cavity 13, pressurizing the surrounding cavity 13 to make the silicone melt flow downward through the convex holes 12 to form a liquid beam, and obtaining the heat exchange hair 22 through cooling. And the heat exchange plate 21 plays a heat exchange role in the surrounding cavity 13, and the heat exchange hair 22 exchanges heat with the outside, which can increase the material selection range of the plate body 11. Because if it is necessary to ensure the strength of the plate body 11, the plate body 11 can choose a high-strength material as the support. The heat exchange hair 22 and the heat exchange plate 21 can still cooperate to achieve the heat exchange function.

[0035] Furthermore, the heat exchange plate 21 and the heat exchange hair 22 are integrally formed by liquid cooling. The heat exchange plate 21 is affected by the surrounding cavity 13 and cannot displace in the horizontal direction. Similarly, the heat exchange hair 22 is affected by the convex holes 12 and cannot displace in the horizontal direction. The tensile force in the horizontal direction between the heat dissipation hair plate 2 and the heat dissipation outer plate 1 is increased. If the inner wall of the surrounding cavity 13 is provided with an adhesion structure, the cured heat exchange plate 21 is kept bonded to the surrounding cavity 13. At this time, the heat exchange plate 21 and the surrounding cavity 13 cannot move along the axis direction of the heat exchange hair 22 either. At this time, the heat dissipation outer plate 1 and the heat dissipation hair plate 2 are fixed, and this can be achieved only by spraying an adhesive into the surrounding cavity 13. The steps are simple, the processing is fast, and the batch processing requirements are met. And the open surface of the surrounding cavity 13 can also be encapsulated with surrounding ribs, or the cross-section of the side wall surface of the surrounding cavity 13 is L-shaped, and both of these two methods can achieve the limit of the heat dissipation hair plate 2 and the heat dissipation outer plate 1 in the direction of the heat exchange hair 22.

[0036] Furthermore, if the plate body 11 is made of a heat dissipation material, setting the convex hole 12 structure can not only increase the heat dissipation area of the plate body 11, but also the convex hole 12 plays a promoting role in the formation of the heat exchange hair 22 in the subsequent processing. For the specific principle, please refer to Embodiment 2.

[0037] To solve the problem of avoiding excessive deformation of the heat exchange hair 22 under strong wind conditions and avoiding the gravity bending of the heat exchange hair 22 when the length of the heat exchange hair 22 is long, the following further improvements are made: A convex portion 23 is provided at the connection between the heat exchange hair 22 and the heat exchange plate 21, and the convex portion 23 matches the inner cavity shape of the convex hole 12. A support core rod 3 is arranged inside the heat exchange hair 22, and the support core rod 3 includes a support rod portion 31 and a triangular support portion 32. The support rod portion 31 is buried at the central axis of the heat exchange hair 22, and the triangular support portion 32 is located inside the convex portion 23. The included angle between the inclined surface of the triangular support portion 32 and the horizontal direction is smaller than the included angle between the inclined surface of the inner wall of the convex hole 12 and the horizontal direction.

[0038] Please refer to Figure 5, a support rod portion 31 and a triangular support portion 32 are embedded in the heat exchange hair 22, and the support rod portion 31 is located inside the heat exchange hair 22. The material of the support rod portion 31 can be nylon or a metal elastic material, and its purpose is only to support the heat exchange hair 22. When in a strong wind state, the heat exchange hair 22 is strengthened and supported through the support rod portion 31 to ensure that the heat exchange hair 22 will not fit with the plate body 11 and cause a problem of reduced heat exchange efficiency. Secondly, when the support rod portion 31 deforms, the top end of the support rod portion 31 bends. In order to avoid the problem that the bottom end of the support rod portion 31 is affected by the top force and has a displacement tendency with respect to the silica gel, the triangular support portion 32 is provided.

[0039] The triangular support portion 32 can be clamped at the convex hole 12. Under the stamping action, the bottom surface of the convex hole 12 will form an inclined surface. The included angle between the inclined surface of the triangular support portion 32 of the triangular support portion 32 and the horizontal direction is smaller than the included angle between the inclined surface of the inner wall of the convex hole 12 and the horizontal direction. The convex portion 23 wraps the upper half of the hypotenuse of the triangular support portion 32. When the support rod portion 31 bends, the hypotenuse of the triangular support portion 32 abuts against the inner hole edge of the convex hole 12. The bottom end of the support rod portion 31 thus plays a limiting role. In the most serious case of bending of the support rod portion 31, the bending point of the support rod portion 31 is close to the vertex of the triangular support portion 32, thereby avoiding the problem that the lower end of the support rod portion 31 is displaced and causes damage to the heat exchange plate 21.

[0040] In order to solve the processing problem after adding the support core rod 3, the following improvements are made: the number of the triangular support portions 32 is at least three, and the triangular support portions 32 are annularly and equidistantly distributed at the bottom end of the support rod portion 31 with the central axis of the support rod portion 31 as the central axis.

[0041] Please refer to Figure 6 , the convex hole 12 is located below during the processing. The triangular support portion 32 is three triangular sheets or three triangular frames. The support rod portion 31 is inserted into the convex hole 12, and the triangular support portion 32 is in contact with the convex hole 12 at three points, naturally aligning the central axis of the support rod portion 31 with the heat exchange hair 22. And after the pressure is applied in the surrounding cavity 13, the pressure is vertically downward, and the direction of the pressure is the same as the gravity direction of the support core rod 3. It is very difficult for the triangular support portion 32 to have a displacement in the direction of overcoming gravity.

[0042] In order to solve the problem that a plurality of convex holes 12 are opened in the heat dissipation outer plate 1 and ensure the stability of the heat dissipation outer plate 1 while reducing the width of the normal flow channel spacing, the following improvements are made: the heat exchange plate 21 is composed of a first array of hairs 221 and a second array of hairs 222. The first array of hairs 221 and the second array of hairs 222 are both distributed in a matrix, the array spacing of the first array of hairs 221 and the second array of hairs 222 is the same, and the first array of hairs 221 and the second array of hairs 222 are staggered.

[0043] Please refer to Figure 3, assuming that the flow channels in the horizontal and vertical directions of the first array of bristles 221 have a width of 10 mm, then the spacing of the first array of bristles 221 in the vertical or horizontal direction is equal to 10 mm plus the diameter of the heat exchange bristles 22. If the flow channels in the horizontal and vertical directions of the first array of bristles 221 are changed to a width of 5 mm, at this time, the spacing of the first array of bristles 221 in the vertical or horizontal direction is equal to 5 mm plus the diameter of the heat exchange bristles 22. However, in this technical solution, a second array of bristles 222 is added. The second array of bristles 222 is offset from the first array of bristles 221, and each independent unit on the second array of bristles 222 is located at the intersection of two cross-connection lines of the four surrounding independent units of the first array of bristles 221. At this time, the width of the flow channel is 5 mm, but the spacing between any two closest heat exchange bristles 22 is greater than 5 mm plus the diameter of the heat exchange bristles 22. This method further strengthens the strength of the plate body 11.

[0044] Embodiment 2: Embodiment 1 explains the structure of the flexible heat dissipation device and the positive effect of the structure on the production process. This embodiment describes the processing process of Embodiment 1: Step S1: Process the convex holes 12 and the surrounding cavities 13 on the plate body 11 through a stamping process and remove burrs.

[0045] Step S2: Use the plate body 11 as a relay mold and sandwich it between the upper mold 100 and the lower mold 200. The convex holes 12 are inserted into the top of the bristle cavity 204. A tapered hole 2011 that fits the convex holes 12 is provided at the top of the profiling top plate 201. The bristle cavity 204 and the convex holes 12 cooperate to form a molding cavity for the heat exchange bristles 22.

[0046] Step S3: The cavity of the upper mold 100 is communicated with the surrounding cavity 13. Silicone melt is injected into the upper mold 100 and pressurized. Under the influence of the pressure, the silicone melt passes through the surrounding cavity 13 and the convex holes 12 and enters the bristle cavity 204 to cool and form.

[0047] Step S4: Separate the plate body 11 from the lower mold 200 to obtain the heat exchange bristles 22, and separate the upper mold 100 from the plate body 11 to obtain the heat exchange plate 21.

[0048] In this technical solution, the plate body 11 is used as a relay mold. The plate body 11 is not only a product but also a mold, which simplifies the mold structure.

[0049] Please refer to Figure 6 , the bottom of the upper mold 100 has a cavity, and the cavity is communicated with the plate body 11 to form a closed cavity. A pressure plate is provided at the top of the upper mold 100. After the pressure plate is pressed down, the liquid in the upper mold 100 is extruded, and the liquid passes through the convex holes 12 and enters the lower bristle cavity 204. The heat exchange bristles 22 are formed by cooling.

[0050] The upper mold 100 can also be selected as a flat plate structure, and a glue injection hole needs to be opened at the top of the upper mold 100. The upper mold 100 closes the open surface at the top of the surrounding cavity 13, and liquid is injected through the glue injection hole. In the form of pressurization, the liquid inside the surrounding cavity 13 enters the hair part cavity 204 through the convex holes 12. Since there are various operation methods, they will not be elaborated here.

[0051] The structure of the convex hole 12 highlights the convenience of processing. The convex hole 12 is engaged with the tapered hole 2011 to achieve the positioning function of the convex hole 12 and the hair part cavity 204, so that the round hole of the convex hole 12 is more accurately aligned with the inner cavity of the hair part cavity 204. And after the convex hole 12 is fitted with the tapered hole 2011, the contact area increases. When not adding the top exhaust channel 205 and relying solely on the bottom exhaust channel 206 for exhaust, the sealing effect of the hair part cavity 204 can be ensured. This mold structure is simple and the manufacturing cost is low.

[0052] If it is necessary to add the support core rod 3, then step S2 is replaced with step S2a: place the convex hole 12 vertically downward, insert the support core rod 3 into the convex hole 12 in sequence, the triangular support part 32 contacts and supports the inner wall of the convex hole 12, the support rod part 31 is located at the central axis of the hair part cavity 204, and use the plate body 11 as a relay mold to sandwich between the upper mold 100 and the lower mold 200. The convex hole 12 is inserted into the top end of the hair part cavity 204, and the hair part cavity 204 and the convex hole 12 cooperate to form the molding cavity of the heat exchange hair 22.

[0053] This move realizes the continuous processing after the addition of the support core rod 3. It is not difficult to see from the above content that the addition of the support core rod 3 does not have a great impact on the processing procedure, and it can be achieved simply by adding. After the liquid is formed through the convex hole 12, the protruding part 23 naturally surrounds most of the upper part of the inclined surface of the triangular support part 32.

[0054] During the separation process of the heat exchange hair 22 and the hair part cavity 204, if the heat exchange hair 22 is slender, the heat exchange hair 22 is prone to breakage during demolding. To solve the breakage problem, the lower mold 200 is divided into three parts: the profiling top plate 201, the sandwich plate 202 and the closed bottom plate 203.

[0055] Please refer to Figure 6 It can be seen that the profiling top plate 201 and the sandwich plate 202 are both provided with the hair part cavity 204. Multiple sandwich plates 202 are spliced with the profiling top plate 201 to form a complete hair part cavity 204, and the closed bottom plate 203 closes the hair part cavity 204. The cross-section of the profiling top plate 201 is H-shaped, and there is a space below the profiling top plate 201 for accommodating the sandwich plate 202 and the closed bottom plate 203. When the sandwich plate 202 and the closed bottom plate 203 are aligned with the profiling top plate 201, they are limited by the accommodation space below the profiling top plate 201. Ensure that the axes of the finally formed hair part cavities 204 are collinear.

[0056] The separation step of the plate body 11 and the lower mold 200 in the improvement step S4 is as follows: the lower mold 200 is separated from below in sequence from bottom to top. Specifically, the closed bottom plate 203 is separated from the sandwich plate 202, and the closed end of the end of the hair part cavity 204 is switched to an open state. Then, the sandwich plates 202 are separated one by one until the separation between the sandwich plate 202 and the profiling top plate 201 is completed. Finally, the profiling top plate 201 is separated from the plate body 11.

[0057] First, the closed bottom plate 203 is separated from the sandwich plate 202, and the closed end face of the hair part cavity 204 is in an open state. The closed bottom plate 203 has a flat plate structure. An exhaust channel can be opened at the closed bottom plate 203. The exhaust channel can be closed with a breathable material or have exhaust gaps. Even if a small amount of silica gel enters the gaps to generate flash, it will not affect the use effect.

[0058] Secondly, the sandwich plates 202 are separated step by step. When separating step by step, the contact area between the hair part cavity 204 and the heat exchange hair 22 is small each time, and the friction force is small, so it is not easy to cause damage to the heat exchange hair 22. Also, an exhaust channel can be provided at the profiling top plate 201. The top exhaust channel 205 communicates with the gap between the conical hole 2011 and the convex hole 12. A small amount of flash will not cause an impact. There are also many methods for the exhaust method. If for simplicity, the exhaust device can also be selected not to be provided. Therefore, the hair part cavity 204 has a certain depth. If the length of the hair part cavity 204 is 5 cm and the length of the heat exchange hair 22 is 3 cm, there is a 2 cm margin. After not setting the exhaust, during the actual processing, affected by the air top, the actual length of the heat exchange hair 22 is less than 5 cm. Only need to trim a part of the length of the removed heat exchange hair 22 and retain the required length.

[0059] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A flexible heat dissipation device, characterized in that: It includes a heat dissipation outer plate (1) and a heat dissipation wool plate (2); the main body of the heat dissipation outer plate (1) is a plate body (11), the top surface of the plate body (11) has a number of uniformly distributed convex holes (12), and the bottom surface of the plate body (11) has an enclosing cavity (13); the heat dissipation wool plate (2) includes a heat exchange plate (21) and heat exchange wool (22), the heat exchange plate (21) is located inside the enclosing cavity (13), and the heat exchange wool (22) passes through the convex holes (12) and stands upright on the top surface of the plate body (11).

2. The flexible heat dissipation device according to claim 1, wherein: A raised portion (23) is provided at the connection between the heat exchange wool (22) and the heat exchange plate (21), and the shape of the raised portion (23) matches the inner cavity shape of the convex hole (12).

3. A flexible heat dissipation device according to claim 2, characterized in that: A support core rod (3) is provided inside the heat exchange wool (22), the support core rod (3) includes a support rod portion (31) and a triangular support portion (32), the support rod portion (31) is buried at the central axis of the heat exchange wool (22), and the triangular support portion (32) is located inside the raised portion (23).

4. The flexible heat dissipation device according to claim 3, wherein: The included angle between the inclined surface of the triangular support portion (32) and the horizontal direction is smaller than the included angle between the inclined surface of the inner wall of the convex hole (12) and the horizontal direction.

5. The flexible heat dissipation device according to claim 3, wherein: The number of the triangular support portions (32) is at least three, and the triangular support portions (32) are annularly and equidistantly distributed at the bottom end of the support rod portion (31) with the central axis of the support rod portion (31) as the central axis.

6. The flexible heat dissipation device according to claim 1, wherein: The heat exchange plate (21) is composed of a first array of wool (221) and a second array of wool (222), both the first array of wool (221) and the second array of wool (222) are distributed in a matrix, the array spacing of the first array of wool (221) and the second array of wool (222) is the same, and the first array of wool (221) and the second array of wool (222) are staggered.

7. A method for preparing a flexible heat dissipation device according to any one of claims 1-6, characterized in that: The steps are as follows: Step S1: The plate body (11) is processed with the convex holes (12) and the enclosing cavity (13) by stamping process and burrs are removed; Step S2: The plate body (11) is used as a relay mold and clamped between an upper mold (100) and a lower mold (200), the convex holes (12) are inserted into the top end of a wool part cavity (204), and the wool part cavity (204) and the convex holes (12) cooperate to form a forming cavity for the heat exchange wool (22); Step S3: The cavity of the upper mold (100) is communicated with the enclosing cavity (13), silicone melt is injected into the upper mold (100) and pressurized, and under the influence of pressure, the silicone melt passes through the enclosing cavity (13) and the convex holes (12) and enters the wool part cavity (204) to cool and form; Step S4: The plate body (11) is separated from the lower mold (200) to obtain the heat exchange wool (22), and the upper mold (100) is separated from the plate body (11) to obtain the heat exchange plate (21).

8. The preparation method of a flexible heat dissipation device according to claim 7, characterized in that: Replace step S2 with step S2a. Step S2a: Place the convex hole (12) vertically downward, insert the support core rod (3) into the convex hole (12) in sequence, make the triangular support part (32) contact and support the inner wall of the convex hole (12), and make the support rod part (31) located at the central axis of the hair part cavity (204). Use the plate body (11) as a relay mold and clamp it between the upper mold (100) and the lower mold (200). Insert the convex hole (12) into the top end of the hair part cavity (204). The hair part cavity (204) and the convex hole (12) cooperate to form the forming cavity of the heat exchange hair (22).

9. The preparation method of a flexible heat dissipation device according to claim 7, characterized in that: The separation step of the plate body (11) and the lower mold (200) in step S4 is: Separate the lower mold (200) from below in sequence from bottom to top. Specifically: Separate the closed bottom plate (203) from the sandwich plate (202), switch the closed end of the end of the hair part cavity (204) to an open state, and then separate the sandwich plates (202) one by one until the sandwich plate (202) is completely separated from the profiling top plate (201). Finally, separate the profiling top plate (201) from the plate body (11).

10. The preparation method of a flexible heat dissipation device according to claim 9, characterized in that: A conical hole (2011) that fits the convex hole (12) is opened at the top of the profiling top plate (201). A top exhaust channel (205) is arranged at the contact surface between the conical hole (2011) and the convex hole (12). A bottom exhaust channel (206) is arranged on the surface of the closed bottom plate (203). The bottom exhaust channel (206) communicates with the cavity end of the hair part cavity (204).

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