Composite thin heat pipe
By setting up a composite structure in the thin heat pipe, including sintered parts and grooves, to increase the contact area and capillary force of the inner wall, the problem of insufficient heat dissipation performance of the thin heat pipe is solved, and a good level and anti-gravity heat dissipation effect is achieved.
Patent Information
- Application Number
- CN202422586959.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-08-26
- Estimated Expiration
- 2034-10-25
AI Technical Summary
The existing thin heat pipes have fewer capillary channels, poor permeability of working fluid, which affects horizontal heat dissipation performance, and the contact area between the capillary structure and the pipe wall is limited, and the anti-gravity heat dissipation effect is poor.
Adopting a composite structure, the tube body is equipped with a symmetrical plane and curved surface, and the inner wall is equipped with a sintered part and a protruding part to form a receiving cavity. The sintered part fills the inner wall of the curved surface and extends to the inner wall of the plane. The groove is arranged on the plane to increase the contact area and capillary force of the inner wall.
It improves the heat transfer efficiency and gravity resistance of the heat pipe, ensures that the working fluid returns quickly in any direction, and enhances the heat dissipation ability of the heat pipe.
Smart Images
Figure CN223271729U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of thin heat pipes, in particular to a composite thin heat pipe. Background Art
[0002] Heat pipe is a kind of efficient heat dissipation component. Due to its ultra-high thermal conductivity, it is widely used in various fields that require good heat dissipation. Its more typical application is in the heat dissipation module of products such as laptops. As people's requirements for the practicality of the above products are getting higher and higher, the products are becoming thinner and lighter. This not only requires the thickness of the heat pipe to be thinner and thinner (the thickness generally used is between 1.5 and 2.5 mm), but also puts higher requirements on the performance of the heat pipe, which at least includes the level of the heat pipe's thermal performance and anti-gravity heat dissipation performance. Therefore, it is urgent to improve the level of thin heat pipes and anti-gravity heat dissipation performance.
[0003] The conventional heat pipe structure is mainly a sealed copper tube with capillary structures or grooves designed on the upper and lower sides or in the middle of one side of the smooth inner wall of the copper tube, and is filled with an appropriate amount of working fluid. When used in conjunction with the evaporation end, the heat of the evaporation end is transferred to one end of the heat pipe, and the working fluid in the tube absorbs heat and vaporizes. Under the action of the pressure difference, the steam flows to the other end at high speed, releases heat to the condensation end and condenses. Under the action of capillary action, the condensed liquid uses the capillary structure to return from the condensation end to the evaporation end. In this cycle, the heat is transferred from the evaporation end to the condensation end efficiently and quickly, achieving the purpose of rapid heat exchange.
[0004] However, this heat pipe structure has the following disadvantages:
[0005] 1. There are fewer capillary channels and the permeability of the working fluid is poor, which has an adverse effect on the horizontal heat dissipation performance of the thin heat pipe;
[0006] 2. The capillary structure of this design has a limited contact area with the tube wall, and the capillary force is not good enough, resulting in the anti-gravity heat dissipation effect of the thin heat pipe not meeting the expected requirements.
[0007] The present invention solves at least one of the above problems. Utility Model Content
[0008] The purpose of the utility model is to provide a composite thin heat pipe, which not only meets the thinness requirements of use but also ensures that it has good horizontal heat dissipation performance and anti-gravity heat dissipation performance.
[0009] The purpose of this utility model is achieved by the following technical solutions:
[0010] The utility model provides a composite thin heat pipe, comprising:
[0011] The tube body has two planar portions symmetrically arranged relative to a first radial direction of the tube body, and two curved portion portions symmetrically arranged relative to a second radial direction of the tube body;
[0012] The flat surface portion and the curved surface portion are spaced apart along the circumference of the tube body, and are sealed and connected in sequence to form a receiving cavity;
[0013] Two sintered parts, each inner wall of the curved portion is provided with a sintered part that completely fills the inner wall of the curved portion, the sintered part is located in the accommodating cavity and extends to at least a portion of the inner wall of the planar portion;
[0014] The inner wall of each of the planar portions is provided with a plurality of protrusions located in the accommodating cavity, and a groove is formed between two adjacent protrusions on the same planar portion;
[0015] The first radial direction is perpendicular to the second radial direction.
[0016] In some possible implementations, the grooves on the two planar portions are symmetrical with respect to a first radial direction of the tube body.
[0017] In some possible implementations, the raised portion is located between the two sintered portions, and the raised portions on the two planar portions do not contact each other, and the raised portion and the sintered portion do not contact each other.
[0018] In some possible implementations, the two sintered parts are symmetrical with respect to a second radial direction of the tube body.
[0019] In some possible implementations, the cross-sectional shape of the protrusion is a rectangle, an isosceles trapezoid, or a triangle.
[0020] In some possible implementations, the number of the grooves on each of the planar portions is 5 to 60; and / or
[0021] The width of each groove is 0.1 to 0.3 mm; and / or
[0022] The depth of each groove is 0.1-0.3 mm.
[0023] In some possible implementations, the sintered portion is a capillary structure sintered with braided copper wires or a capillary structure sintered with copper powder.
[0024] In some possible implementations, the copper powder has a mesh size of 60 to 200 meshes.
[0025] In some possible implementations, the braided copper wire has a wire diameter of 0.03 to 0.10 mm.
[0026] Compared with the prior art, the beneficial effects of the present invention are:
[0027] 1. The setting of the sintered part effectively avoids the extrusion deformation of the groove part after flattening, and reduces the space waste caused by the reduction in volume during flattening. The presence of the sintered part can increase the surface area of the tube body and enhance the contact between the working fluid and the inner wall of the tube body, which can not only improve the heat transfer efficiency, but also effectively increase the capillary force inside the heat pipe and increase the heat pipe performance under reverse gravity. Specifically, since the use of the heat pipe has no fixed direction, it is necessary to adapt to the reflux of the working fluid in all directions. By completely filling the inner wall of the curved part with the sintered part and extending it to part of the inner wall of the flat part, the contact area with the inner wall of the tube body is increased, further increasing the capillary force, and then enabling the sintered part to transmit the working fluid under reverse gravity, ensuring that the working fluid can quickly flow back to the evaporation end anywhere as the condensation section, greatly improving the performance of the heat pipe in the horizontal direction and anti-gravity direction.
[0028] 2. The interfacial tension of the grooves on the flat surface allows for rapid reflux of the working fluid, effectively transferring heat. By machining multiple grooves on the inner wall of the pipe, these grooves act like capillaries, generating a certain amount of suction that promotes rapid reflux of the working fluid within the chamber. This not only increases the permeability of the working fluid, but also greatly reduces the flow resistance of steam and condensate, thereby improving the heat transfer efficiency of the heat pipe. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] Figure 1 This is a schematic structural diagram of the composite thin heat pipes of Examples 1 and 2 of the present utility model;
[0030] Figure 2 This is a schematic structural diagram of a full-grooved heat pipe according to comparative example 1 of the present invention;
[0031] Figure 3 This is a schematic structural diagram of the all-copper powder heat pipe of comparative example 2 of the present invention.
[0032] In the figure: 1, tube body; 11, flat portion; 12, curved portion; 13, accommodating cavity; 14, raised portion; 15, groove; 2, sintering portion. DETAILED DESCRIPTION
[0033] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make this disclosure more comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art. Identical reference numerals in the figures denote identical or similar structures, and thus repeated descriptions thereof will be omitted.
[0034] The words expressing positions and directions described in this utility model are all explained with reference to the accompanying drawings as examples, but they can be changed as needed, and all such changes are included in the protection scope of this utility model.
[0035] The utility model provides embodiment 1, which provides a composite thin heat pipe. Figure 1 As shown, it includes a tube body 1 and two sintered parts 2.
[0036] The tube body 1 has two planar portions 11 symmetrically arranged with respect to a first radial direction of the tube body 1 , and two curved portion portions 12 symmetrically arranged with respect to a second radial direction 6 of the tube body 1 .
[0037] In this embodiment, the thickness of the flat surface portion 11 and the curved surface portion 12 is the same, preferably 0.3 mm. The first radial direction is perpendicular to the second radial direction, and the radius of the first radial direction of the tube body 1 is greater than the radius of the second radial direction.
[0038] It should be noted that, in this embodiment, the tube body 1 is a flat tube body 1 formed by pressing, and the material of the tube body 1 is preferably copper.
[0039] The flat surface portion 11 and the curved surface portion 12 are spaced apart along the circumference of the tube body 1 , and are sealed and connected in sequence to form an accommodating cavity 13 .
[0040] It should be noted that the sealing connection between the flat portion 11 and the curved portion 12 is integrally formed, fully ensuring good sealing of the side wall of the tube body 1. The accommodating cavity 13 is used to fill a working fluid, such as water, alcohol, coolant or other liquid, preferably water in this embodiment.
[0041] Each inner wall of the curved portion 12 is provided with a sintered portion 2 that completely fills the inner wall of the curved portion 12 , wherein the two sintered portions 2 are symmetrically distributed relative to the second radial direction. Furthermore, the sintered portion 2 is located in the accommodating cavity 13 and extends to at least a portion of the inner wall of the planar portion 11 .
[0042] It should be further explained that the sintering portion 2 may be a capillary structure sintered with braided copper wire or a capillary structure sintered with copper powder. In this embodiment, the sintering portion 2 is preferably a capillary structure sintered with copper powder.
[0043] In this embodiment, the volume of the sintering portion 2 accounts for approximately 35% to 40% of the entire accommodating cavity 13, and the remaining accommodating cavity 13 serves as a steam channel. Preferably, the volume ratio of the capillary structure to the steam is 4:6. At this volume ratio, the heat pipe has better heat dissipation performance.
[0044] The provision of the sintered portion 2 effectively prevents deformation of the groove 15 after flattening, reducing the space wasted due to the reduced volume during flattening. The presence of the sintered portion 2 increases the internal surface area of the tube body 1, enhancing contact between the working fluid and the inner wall of the tube body 1. This not only improves heat transfer efficiency but also effectively increases the capillary force within the heat pipe, enhancing heat pipe performance under reverse gravity.
[0045] Specifically, since heat pipes have no fixed direction of use, they need to accommodate working fluid reflux in all directions. By completely filling the inner wall of the curved portion 12 and extending it to a portion of the inner wall of the flat portion 11, the sintered portion 2 increases its contact area with the inner wall of the tube body 1, further increasing the capillary force. This allows the sintered portion 2 to transfer working fluid against gravity, ensuring that the working fluid can quickly return to the evaporation end regardless of the condensation section, greatly improving the heat dissipation performance of the heat pipe in both the horizontal and anti-gravity directions.
[0046] A plurality of protrusions 14 located in the accommodating cavity 13 are provided on the inner wall of each planar portion 11 , and a groove 15 is formed between two adjacent protrusions 14 on the same planar portion 11 .
[0047] The interfacial tension of the grooves 15 on the planar portion 11 allows for rapid recirculation of the working fluid, effectively transferring heat. By machining multiple grooves 15 on the inner wall of the heat pipe body 1, these grooves 15 act like capillaries, generating a certain suction force that promotes rapid recirculation of the working fluid within the chamber 13. This not only increases the permeability of the working fluid but also significantly reduces the flow resistance of steam and condensate, thereby improving the heat transfer efficiency of the heat pipe.
[0048] It should be noted that the raised portion 14 is located between the two sintered portions 2, and the raised portions 14 on the two planar portions 11 do not contact each other, nor do the raised portions 14 contact the sintered portions 2. The sufficient accommodating cavity 13 can accommodate enough working fluid.
[0049] Furthermore, the grooves 15 on the two planar portions 11 are symmetrical with respect to the first radial direction.
[0050] The cross-sectional shape of the protrusion 14 can be a rectangle, an isosceles trapezoid or a triangle. When the cross-sectional shape of the protrusion 14 is a rectangle, the cross-sectional shape of the corresponding groove 15 is also a rectangle; when the cross-sectional shape of the protrusion 14 is an isosceles trapezoid, the cross-sectional shape of the corresponding groove 15 is also an isosceles trapezoid; when the cross-sectional shape of the protrusion 14 is a triangle, the cross-sectional shape of the corresponding groove 15 is also a triangle.
[0051] In some special processing conditions, the cross-sectional shapes of two adjacent protrusions 14 on the same plane portion 11 may be the same or different, that is, the cross-sectional shape of one protrusion 14 may be any one of a rectangle, an isosceles trapezoid or a triangle, and the cross-sectional shape of the other protrusion 14 may also be any one of a rectangle, an isosceles trapezoid or a triangle.
[0052] Furthermore, the number of grooves 15 on each planar portion 11 may be 5 to 60; the width (along the first radial direction) of each groove 15 may be 0.2 to 0.3 mm; and the depth (along the first radial direction) of each groove 15 may be 0.2 to 0.3 mm.
[0053] In this embodiment, the cross-section of the protrusion 14 is preferably an isosceles trapezoid. The number of grooves 15 on each flat portion 11 is preferably 30, the minimum width of the groove 15 is preferably 0.2 mm, the maximum width of the groove 15 is preferably 0.3 mm, and the depth of the groove 15 is preferably 0.25 mm.
[0054] Furthermore, when the sintering portion 2 is a capillary structure sintered with copper powder, the mesh size of the copper powder is 60 to 200. Generally speaking, the smaller the mesh size of the copper powder, the better the permeability of the heat pipe, and the larger the mesh size of the copper powder, the greater the capillary force inside the heat pipe. The mesh size can be determined according to different usage scenarios. In this embodiment, the mesh size of the copper powder is preferably 100 mesh.
[0055] When the sintering part 2 is a capillary structure sintered with braided copper wire, the diameter of the braided copper wire is 0.03-0.1 mm. Generally, the larger the diameter of the braided copper wire, the greater the capillary force inside the heat pipe and the better the anti-gravity performance of the heat pipe.
[0056] Example 2
[0057] See attached Figure 1 As shown, the difference from Example 1 is that the sintered portion 2 is a capillary structure sintered with braided copper wires. In this embodiment, the wire diameter of the braided copper wires is preferably 0.05 mm.
[0058] Comparative Example 1
[0059] Full groove heat pipe
[0060] See attached Figure 2 As shown, the difference from Example 1 is that there is no sintered part 2.
[0061] Comparative Example 2
[0062] All-copper powder heat pipe
[0063] See attached Figure 3 As shown, the difference from the embodiment 1 is that there is no protrusion 14 and groove 15.
[0064] A heat pipe Qmax test was performed on the above-mentioned Examples 1 and 2 and Comparative Examples 1 and 2. The Qmax of a heat pipe refers to the maximum heat transfer power of the heat pipe (unit: W).
[0065] The Qmax test method is as follows: Place the heat pipe in the required horizontal and anti-gravity orientation, with the evaporator in contact with the heating copper block and the condenser in contact with the cooling copper block. Apply thermal paste evenly to the contact surfaces to minimize contact thermal resistance. The cooling copper block is cooled by constant-temperature cooling water. Start with a low heating power. Once the temperatures at each point reach equilibrium and stabilize, record the heating power and temperature data. Then gradually increase the heating power until the temperature difference between the evaporator and condenser sections of the heat pipe exceeds 5°C. At this point, the heating power is considered the maximum heat transfer power of the heat pipe.
[0066] Therefore, the maximum heat transfer power of the heat pipe in the horizontal direction and the maximum heat transfer power in the anti-gravity direction were tested, and the test results are shown in Table 1.
[0067] Table 1: Qmax test results of each heat pipe in the horizontal direction and anti-gravity direction.
[0068]
[0069] By comparing Examples 1 and 2 and Comparative Examples 1 and 2, the composite thin heat pipe of the present application has a higher maximum heat transfer power in the horizontal direction and the anti-gravity direction, which means that the composite thin heat pipe has better heat dissipation performance in the horizontal direction and the anti-gravity direction.
[0070] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limiting the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the utility model without departing from the principles and purpose of the utility model. All of these changes should fall within the scope of protection of the claims of the present invention.
Claims
1. A composite thin heat pipe, characterized in that: include: A tube body (1) having two planar portions (11) symmetrically arranged relative to a first radial direction of the tube body (1), and two curved portion portions (12) symmetrically arranged relative to a second radial direction of the tube body (1); The flat surface portion (11) and the curved surface portion (12) are spaced apart along the circumference of the tube body (1), and are sealed and connected in sequence to form a receiving cavity (13); Two sintered portions (2) are arranged opposite to each other, and each inner wall of the curved portion (12) is provided with a sintered portion (2) that completely fills the inner wall of the curved portion (12), and the sintered portion (2) is located in the accommodating cavity (13) and extends to at least a portion of the inner wall of the planar portion (11); The inner wall of each plane portion (11) is provided with a plurality of protrusions (14) located in the accommodating cavity (13), and a groove (15) is formed between two adjacent protrusions (14) on the same plane portion (11); The first radial direction is perpendicular to the second radial direction.
2. The composite thin heat pipe according to claim 1, characterized in that: The grooves (15) on the two planar portions (11) are symmetrical relative to a first radial direction of the tube body (1).
3. The composite thin heat pipe according to claim 1, characterized in that: The raised portion (14) is located between the two sintered portions (2), and the raised portions (14) on the two plane portions (11) do not contact each other, and the raised portion (14) and the sintered portion (2) do not contact each other.
4. The composite thin heat pipe according to claim 1, characterized in that: The two sintered parts (2) are symmetrical relative to the second radial direction of the tube body (1).
5. The composite thin heat pipe according to claim 1, characterized in that: The cross-sectional shape of the protrusion (14) is a rectangle, an isosceles trapezoid or a triangle.
6. The composite thin heat pipe according to claim 1, characterized in that: The number of the grooves (15) on each of the planar portions (11) is 5 to 60; and / or The width of each groove (15) is 0.1 to 0.3 mm; and / or The depth of each groove (15) is 0.1-0.3 mm.
7. The composite thin heat pipe according to any one of claims 1 to 6, characterized in that: The sintering portion (2) is a capillary structure sintered with braided copper wire or a capillary structure sintered with copper powder.
8. The composite thin heat pipe according to claim 7, characterized in that: The mesh number of the copper powder is 60 to 200 meshes.
9. The composite thin heat pipe according to claim 7, characterized in that: The wire diameter of the braided copper wire is 0.03-0.10 mm.