Nested phase change heat conduction structure and manufacturing method thereof

Abstract

The invention discloses a nested phase change heat conduction structure and a manufacturing method thereof.The nested phase change heat conduction structure comprises a uniform temperature plate and a heat pipe, the heat pipe comprises multiple sections of pipe bodies, the multiple sections of pipe bodies are sequentially and coaxially connected in a nested mode to form a multi-stage nested heat pipe structure, each section of pipe body is provided with a pipe cavity, and a hollow first capillary structure is arranged in each pipe cavity; pipe cavities of two adjacent pipe bodies which are connected in a nested mode are not communicated, other pipe bodies except the first pipe body are divided into an evaporation section, a condensation section and a heat insulation section located between the evaporation section and the condensation section in the length direction of the first pipe body, the first pipe body is divided into a heat insulation section and a condensation section in the length direction of the first pipe body, and the heat insulation section of the first pipe body is communicated with a cavity of the vapor chamber in a sealed mode. And then the evaporation section of the next section of pipe body is coaxially embedded into the condensation section of the previous section of pipe body, a second capillary structure is arranged at the sealing position of the condensation section of the previous section of pipe body and the evaporation section of the next section of pipe body, and the second capillary structure is connected with the first capillary structure. The problem that heat transfer power consumption is sharply reduced due to the fact that liquid cannot flow back due to the fact that a heat pipe is too long when the 3DVC works under inverse gravity is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat dissipation modules, and in particular to a nested phase-change heat-conducting structure and a manufacturing method thereof. Background Art

[0002] With the rapid development of chip technology and the emergence of various complex application scenarios, such as autonomous driving, which has put forward higher requirements on the computing power of chips, high-power and high heat flux density chips have also developed accordingly, and the heat conduction of chips has become more and more severe. 3D heat sink (3DVC) is a phase change thermal conductive device that combines the advantages of heat pipes and heat sinks (VC) and is an optimal component for heat conduction of high power consumption and high heat flux density chips. It can quickly conduct local heat sources to other places. It has the characteristics of high heat transfer capacity, light weight, simple structure and versatility. It is used in the conduction and heat dissipation of heating components in electronic products, which can effectively overcome the problem of increasing heat in electronic heating components.

[0003] At present, based on the different installation positions of the 3D heat sink, when the 3DVC works under counter-gravity conditions, the heat source is set upward and the heat pipe is set downward relative to the heat source. The capillary force must overcome the liquid resistance and liquid gravity. The longer the heat pipe, the more difficult it is for the liquid working fluid condensed in the condensation section to flow back to the evaporation section at a high position, causing a sharp drop in heat transfer power consumption, resulting in poor heat dissipation performance, and unable to meet the heat dissipation requirements of high-power chips. Summary of the invention

[0004] In view of the defects of the above prior art, one of the present inventions is to provide a nested phase change heat conduction structure to solve the problem that when 3DVC works in reverse gravity, the heat pipe is too long and the liquid cannot flow back, resulting in a sharp decrease in heat transfer power consumption.

[0005] One of the present invention is implemented by the following technical solution:

[0006] A nested phase-change heat-conducting structure comprises a temperature equalizing plate and a heat pipe, wherein the heat pipe comprises a plurality of tube sections, which are coaxially nested and connected in sequence to form a multi-stage nested heat pipe structure, each tube section having a tube cavity, wherein a hollow first capillary structure is arranged in the tube cavity, and the tube cavities of two adjacent nested tube sections are not communicated with each other, and the remaining tube sections except the first tube section are divided into an evaporation section, a condensation section and an insulation section located therebetween along their length direction, and the first tube section is divided into an insulation section and a condensation section along its length direction, and the insulation section of the first tube section is sealed and connected to the cavity of the temperature equalizing plate, and then the evaporation section of the next tube section is coaxially embedded in the condensation section of the previous tube section, and the condensation section of the previous tube section is provided with a second capillary structure at the sealing position with the evaporation section of the next tube section, and the second capillary structure is connected to the first capillary structure.

[0007] Furthermore, the outer diameter of the first tube section is the largest, and the outer diameter of each subsequent tube section decreases successively, and the outer diameter of the next tube section is at least 3 mm smaller than the outer diameter of the previous tube section.

[0008] Furthermore, the outer diameter of the evaporation section of each tube section except the first tube section is smaller than the outer diameter of the condensation section, and the outer diameter of the condensation section is the same as the outer diameter of the insulation section.

[0009] Furthermore, the second capillary structure and the first capillary structure are in close contact and connection with each other.

[0010] Furthermore, the two adjacent nested tube sections are sealed and fixed at the connection position by welding.

[0011] Furthermore, the end of the condensing section of each tube section has an opening, the opening is provided with an end cover, the end cover is provided with an opening for inserting the evaporation section of the previous tube section, and the second capillary structure is arranged on the inner end surface of the end cover.

[0012] Furthermore, the end cover is provided with a degassing pipe, and the degassing pipe is communicated with the tube cavity.

[0013] Furthermore, the temperature equalizing plate has a temperature equalizing cavity and a plug hole connected to the temperature equalizing cavity, the insulation section of the first tube section is sealed and connected to the plug hole, and the tube cavity of the first tube section is connected to the temperature equalizing cavity.

[0014] Furthermore, a third capillary structure is provided in the temperature-averaging chamber, and a capillary connector for connecting the third capillary structure with the first capillary structure of the first tube body is provided in the temperature-averaging chamber.

[0015] The second aspect of the present invention is to provide a method for manufacturing a nested phase-change heat-conducting structure to improve production efficiency.

[0016] The second aspect of the present invention is implemented by the following technical solution:

[0017] A method for manufacturing a nested phase-change heat-conducting structure includes the above-mentioned nested phase-change heat-conducting structure, and the manufacturing method includes the following steps:

[0018] S1, the third capillary structure is sintered on the temperature averaging plate and then welded into shape;

[0019] S2, sintering the first capillary structure of the first tube body;

[0020] S3, assembling the first tube body of step S2 onto the temperature equalizing plate of step S1;

[0021] S4, then sintering each tube section step by step to form a first capillary structure, and then coaxially nesting and connecting each tube section after sintering with the previous tube section step by step, finally forming a 3DVC heat conduction structure;

[0022] S5, brazing the entire 3DVC heat-conducting structure formed in step S4;

[0023] S6. Evacuate each tube section and the temperature equalizing plate, inject the working fluid and seal the gas inlet.

[0024] Compared with the prior art, the beneficial effects of the present invention include at least:

[0025] (1) The heat pipe of the present invention comprises a plurality of tube sections, which are coaxially nested and connected in sequence to form a multi-stage nested heat-conducting structure, so that the heat transfer path of the entire 3DVC heat-conducting structure is divided into a plurality of independent circulation paths, and each tube section has an independent working fluid condensation and reflux path, which greatly shortens the working fluid condensation and reflux path and reduces the working fluid condensation and reflux resistance, so that the working fluid can easily reflux to the evaporation section, thereby avoiding the situation where the working fluid is accumulated in the condensation section and the evaporation section lacks the working fluid due to the excessive length of the heat pipe and the excessively long working fluid reflux path, and effectively solves the problem that when the 3DVC works against gravity, the heat pipe is too long and the liquid cannot reflux, resulting in a sharp decrease in heat transfer power consumption.

[0026] (2) Since the evaporation section of the next tube section is coaxially embedded in the condensation section of the previous tube section, the evaporation section of the next tube section overlaps with the condensation section of the previous tube section when they are nested with each other, forming a heat exchange zone, thereby realizing a heat exchange cycle between two adjacent tube sections. By adopting the above-mentioned nested heat transfer method, the contact area between the two adjacent tube sections in the axial direction is maximized, thereby greatly improving the heat transfer coefficient, which is beneficial to improving the heat dissipation performance; at the same time, by nesting and connecting multiple tube sections, long-distance heat transfer transmission can be realized; the nested heat transfer method also greatly reduces the impact of environmental temperature differences to adapt to heat transfer requirements with large temperature differences.

[0027] (3) The heat pipe includes a tube body with multiple sections arranged separately, so that each section of the tube body can be manufactured and processed independently, which can ensure that each section of the tube body has excellent performance; at the same time, two adjacent sections of the tube body are connected in a nested manner, which is simple to assemble, and the tube cavity of each section of the tube body except the first section of the tube body is independently arranged, which reduces the heat loss in the heat transfer process and effectively improves the heat dissipation performance of the phase change heat conductive structure.

[0028] (4) A hollow first capillary structure is provided in each tube section, which can realize the circulation of the condensed working fluid in the tube body from the condensation end to the evaporation end. When the heat pipe is used under reverse gravity, since each tube section is shorter, the reflux path of the condensed working fluid is shorter, and a second capillary structure is provided at the end of the condensation section. The second capillary structure can increase the return water capacity of the condensation section, which is conducive to the working fluid condensed in the condensation section to return to the evaporation section to continue to be heated and vaporized to take away heat. Therefore, each tube section also has good reflux capacity and heat transfer capacity, thereby solving the problem of effective condensed working fluid accumulating at the condensation end and lack of working fluid at the evaporation end.

[0029] (5) In the manufacturing method of the nested phase change thermal conductive structure of the present invention, each section of the tube body is manufactured separately, which can ensure that each section of the tube body has excellent performance, and each section of the tube body has a simple structure and high production efficiency. Finally, multiple sections of the tube body are combined and welded together. Under the premise of maintaining its excellent performance, the manufacturing cost is greatly reduced and the production efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic diagram of a nested phase-change heat-conducting structure according to Example 1 of the present invention;

[0031] Figure 2 is one of the cross-sectional views of the nested phase-change heat-conducting structure of Example 1 of the present invention;

[0032] Figure 3 This is the second cross-sectional view of the nested phase-change heat-conducting structure of Example 1 of the present invention;

[0033] Figure 4 is a schematic diagram of a nested phase-change heat-conducting structure according to Example 2 of the present invention;

[0034] Figure 5 is one of the cross-sectional views of the nested phase-change heat-conducting structure of Example 2 of the present invention;

[0035] Figure 6 is a cross-sectional view of a tube body according to Embodiment 2 of the present invention;

[0036] Figure 7 This is the second cross-sectional view of the nested phase-change heat-conducting structure of Example 2 of the present invention;

[0037] In the figure: 1. temperature averaging plate; 11. temperature averaging chamber; 12. plug hole; 13. third capillary structure; 14. capillary connector; 2. heat pipe; 21. tube body; 210. tube cavity; 211. first capillary structure; 212. evaporation section; 213. condensation section; 214. second capillary structure; 215. end cover; 216. degassing pipe. DETAILED DESCRIPTION

[0038] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete and to fully convey the concepts of example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0039] The words expressing positions and directions described in the present invention 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 the present invention.

[0040] Example 1

[0041] like Figure 1-Figure 3 As shown, a nested phase change heat conduction structure provided by the present invention includes a temperature equalizing plate 1 and a heat pipe 2, wherein the heat pipe 2 includes a plurality of tube bodies 21, which are coaxially nested and connected in sequence to form a multi-stage nested heat pipe structure, each tube body 21 has a tube cavity 210, and a hollow first capillary structure 211 is provided in the tube cavity 210, and the tube cavities 210 of two adjacent nested tube bodies 21 are not connected to each other, and the remaining tube bodies 21 except the first tube body 21 are divided into an evaporation section 212, a condensation section 213 along their length direction. 13 and the insulation section therebetween, the first tube section 21 is divided into an insulation section and a condensation section 213 along its length direction, the insulation section of the first tube section 21 is sealed and connected with the cavity of the temperature equalizing plate 1, and then the evaporation section 212 of the next tube section 21 is coaxially embedded in the condensation section 213 of the previous tube section 21, and the condensation section 213 of the previous tube section 21 is provided with a second capillary structure 214 at the sealing position with the evaporation section 212 of the next tube section 21, and the second capillary structure 214 is connected with the first capillary structure 211.

[0042] In this embodiment, the insulating section of the first tube body 21 is sealed and connected to the cavity of the temperature averaging plate 1, and the tube cavity 210 of the first tube body 21 is connected to the cavity of the temperature averaging plate 1 to form a three-dimensional cavity. The working principle of the nested phase change heat conduction structure is: after each tube body 21 and the temperature averaging plate 1 are evacuated, the working fluid is injected, and the working fluid will be adsorbed into the capillary structure due to the capillary force of the capillary structure. The bottom of the temperature averaging plate 1 is in contact with the chip, and the place where the temperature averaging plate 1 contacts the chip is called the evaporation zone. The chip will generate heat when working, and the heat is introduced into the temperature averaging plate 1. The working fluid in the evaporation zone will be heated and evaporated due to the heat conduction of the temperature averaging plate 1, and the evaporated gas phase working fluid will fill the entire three-dimensional cavity. Since fins for cooling are generally provided outside the heat pipe 2, the temperature of the heat pipe 2 is relatively low. When the gas phase working fluid contacts the colder area of ​​the heat pipe 2, it will condense into a liquid phase working fluid on the wall of the heat pipe 2, and release heat to achieve heat dissipation. The liquid phase working medium condensed on the inner wall of the heat pipe 2 will be sucked back into the capillary structure due to the capillary force generated by the first capillary structure 211 in the tube body 21, and then return to the evaporation area through the first capillary structure 211 to continue to be heated and vaporized to take away heat, thereby achieving continuous heat dissipation of the chip.

[0043] Based on the above working principle, the present invention coaxially embeds the evaporation section 212 of the next tube section 21 into the condensation section 213 of the previous tube section 21, that is, the evaporation section 212 of the next tube section 21 overlaps with the condensation section 213 of the previous tube section 21 when they are nested with each other, forming a heat exchange zone, that is, the evaporation section 212 of the next tube section 21 is heat transferred inside the condensation section 213 of the previous tube section 21, and the evaporation section 212 of the next tube section 21 absorbs heat and transfers the heat to the working medium in the next tube section 21, so that the working medium of the next tube section 21 evaporates to form steam, and the steam carries the heat in the tube cavity 213 of the next tube section. 10, the steam condenses into a liquid phase working medium in the condensing section 213 of the next tube body 21, and releases heat to achieve heat dissipation, and so on, thereby realizing a heat exchange cycle between two adjacent tube bodies 21. Each tube body 21 maximizes the contact area between the two adjacent tube bodies 21 in the axial direction by adopting the above-mentioned nested connection heat transfer method, so that the heat transfer coefficient is greatly improved, which is beneficial to improving the heat dissipation performance; at the same time, by nesting and connecting multiple tube bodies 21, long-distance heat exchange transmission can be achieved; the nested heat transfer method also greatly reduces the impact of environmental temperature differences to adapt to the heat transfer requirements of large temperature differences.

[0044] In this embodiment, the heat pipe 2 of the present invention includes a multi-section tube body 21, which is coaxially nested and connected in sequence to form a multi-stage nested heat conduction structure, so that the heat transfer path of the entire 3DVC heat conduction structure is divided into multiple independent circulation paths, and each section of the tube body 21 has an independent working medium condensation reflux path, which greatly shortens the working medium condensation reflux path and reduces the working medium condensation reflux resistance, so that the working medium can easily reflux to the evaporation section 212, thereby avoiding the situation where the working medium is accumulated in the condensation section 213 and the evaporation section 212 lacks working medium due to the length of a single heat pipe 2 being too long and the working medium reflux path being too long, and solving the problem that the heat transfer power consumption of 3DVC is sharply reduced due to the inability of the liquid to reflux due to the excessive length of the heat pipe 2 when working against gravity. . In addition, the heat pipe 2 includes a tube body 21 with multiple sections, so that each section of the tube body 21 can be independently manufactured and processed, which can ensure that each section of the tube body 21 has excellent performance; at the same time, two adjacent sections of the tube body 21 are connected in a nested manner, which is simple to assemble, and the tube cavity 210 of each section of the tube body 21 except the first section of the tube body 21 is independently arranged, which reduces heat loss during the heat transfer process and effectively improves the heat transfer effect.

[0045] Since a hollow first capillary structure 211 is provided in each section of the tube body 21, the condensed working fluid in the tube body 21 can be circulated from the condensation end to the evaporation end, especially when the condensation section 213 is at a lower position relative to the evaporation end. Since the length of each section of the tube body 21 is shorter, the reflux path of the condensed working fluid is shorter, and a second capillary structure 214 is provided at the end of the condensation section 213. When the nested phase change heat conductive structure is used under a reverse gravity state, the reflux capacity of the condensation section 213 can be increased, and the evaporation rate of the evaporation section 212 will be accelerated, which is conducive to the working fluid condensed in the condensation section 213 to quickly flow back to the evaporation section 212 to continue to be heated and vaporized to take away heat. Therefore, each section of the tube body 21 also has good reflux capacity and heat transfer capacity, thereby solving the problem of effective condensed working fluid accumulating at the condensation end and lack of working fluid at the evaporation end, thereby greatly improving the heat transfer performance.

[0046] like Figure 2 As shown, during operation, the working fluid in each tube section 21 is heated and evaporated at the evaporation section 212, passes through the tube cavity 210, and condenses at the condensation section 213, as shown by arrow S1. The condensed working fluid sequentially travels from the condensation section 213 back to the evaporation section 212 through the first capillary structure 211, as shown by the direction of arrow S2; because the evaporation section 212 of the next tube section 21 is coaxially nested in the condensation end of the previous tube section 21, the contact area between the two adjacent tube sections 21 in the axial direction is maximized, so that the heat transfer coefficient is greatly improved, which is conducive to improving the heat dissipation performance.

[0047] It should be noted that the working fluid in this embodiment is a liquid with high vaporization latent heat, such as water, methanol, acetone or other single substances or mixtures thereof. The cross-sectional shape of each tube body 21 is circular, elliptical, flat or other shapes, which is not specifically limited in the present invention.

[0048] In this embodiment, the temperature plate 1 is arranged at a higher position, such as Figure 3 and Figure 7 As shown, the heat pipe 2 is arranged in a direction such that the evaporation section 212 of each tube body 21 is at a higher position than the condensation section 213. During operation, the condensed working fluid needs to resist gravity and move vertically upward, pass through the first capillary structure 211 and the second capillary structure 214, and return to the evaporation section 212, as shown by the direction of the arrow S2. In this embodiment, since the heat pipe 2 of the present invention is composed of multiple nested tube bodies 21, the length of each tube body 21 does not need to be designed to be too long, so that the return path of the condensed working fluid is not too long, which solves the problem that the traditional slender heat pipe 2 is difficult to reach the evaporation section 212 due to the long return path and high resistance of the condensed working fluid.

[0049] It can be understood that in other embodiments, the temperature plate 1 is arranged at a lower position, such as Figure 2As shown, the evaporation section 212 of the first tube body 21 is located at a lower position than the condensation section 213. In this embodiment, gravity helps to move the condensed working medium back to the evaporation section 212. Of course, the nested phase change heat conduction structure of the present invention can also be placed horizontally for use.

[0050] As a preferred embodiment, the first tube section 21 has the largest outer diameter, and the outer diameter of each subsequent tube section 21 decreases successively, and the outer diameter of the next tube section 21 is at least 3 mm smaller than the outer diameter of the previous tube section 21 .

[0051] In this embodiment, by setting each section of the tube body 21 to have a different diameter, it is convenient to nest the two sections of the tube body 21, so that the heat dissipation operation is more stable; at the same time, the diameter of each section of the tube body 21 is different, which can meet different heat dissipation requirements and installation requirements. The outer diameter of the next section of the tube body 21 is at least 3mm smaller than the outer diameter of the previous section of the tube body 21, which can ensure that the nesting connection between the next section of the tube body 21 and the previous section of the tube body 21 is reliable and highly safe.

[0052] As a preferred embodiment, the second capillary structure 214 and the first capillary structure 211 are in close contact and connection with each other.

[0053] In this embodiment, the first capillary structure 211 and the second capillary structure 214 are both used to generate capillary action, which pumps the condensed working fluid in the tube body 21 from the condensation section 213 to the evaporation section 212. The second capillary structure 214 and the first capillary structure 211 are closely connected to each other, which is conducive to improving the reflux speed of the condensed working fluid, thereby improving the heat dissipation performance. Among them, the first capillary structure 211 and / or the second capillary structure 214 are sintered metal powder, concave-convex grooves or metal mesh, so that the working fluid inside the tube body 21 using the above capillary structure can flow back to the evaporation section 212 faster, thereby improving the heat dissipation efficiency of the heat pipe;

[0054] As a preferred embodiment, the two adjacent nested tube bodies 21 are sealed and fixed at the connection position by welding. The two adjacent nested tube bodies 21 are sealed and fixed by welding to ensure the sealing performance of each tube cavity 210. Preferably, brazing is used for welding, which can obtain a weld with good sealing, high stability, neatness and beauty compared with ordinary welding.

[0055] As a preferred embodiment, the end of the condensation section 213 of each tube section 21 has an opening, and the opening is provided with an end cover 215 . The end cover 215 has an opening for inserting the evaporation section 212 of the previous tube section 21 , and the second capillary structure 214 is arranged on the inner end surface of the end cover 215 .

[0056] In this embodiment, the evaporation section 212 of the next tube body 21 is inserted into the condensation section 213 of the previous tube body 21 through the opening of the end cover 215 to achieve the nested connection of the two tube bodies 21. After the nested connection, the connection position is brazed and sealed to ensure the sealing of the previous tube body 21. The second capillary structure 214 is arranged on the inner end surface of the end cover 215, so that the condensed working medium accumulated on the inner end surface of the end cover 215 can flow back to the evaporation section 212 with the help of the second capillary structure 214, so as to achieve the recycling of working medium and avoid the accumulation of condensed working medium on the inner end surface of the end cover 215.

[0057] As a preferred embodiment, the end cap 215 is provided with a degassing pipe 216, and the degassing pipe 216 is communicated with the tube cavity 210. By providing the degassing pipe 216, it is convenient to perform processing, exhaust and other operations on the tube body 21 later.

[0058] It should be noted that the reference Figure 1 , each tube section 21 except the first tube section 21 and the tail tube section 21 is provided with a degassing pipe 216, and the tube cavity 210 of the first tube section 21 is connected to the temperature averaging cavity 11 of the temperature averaging plate 1. Therefore, the degassing operation of the first tube section 21 can be achieved by providing a degassing structure on the temperature averaging plate 1. Of course, in other embodiments, refer to Figure 4 The end cover 215 of each tube body 21 is provided with a degassing pipe 216 .

[0059] As a preferred embodiment, the temperature equalizing plate 1 has a temperature equalizing chamber 11 and a plug hole 12 connected to the temperature equalizing chamber 11 , the insulating section of the first tube body 21 is sealed and connected to the plug hole 12 , and the tube cavity 210 of the first tube body 21 is connected to the temperature equalizing chamber 11 .

[0060] In this embodiment, the temperature-averaging plate 1 can be a two-dimensional heat dissipation structure, which is a plate-like structure or a box-like structure with a vacuum cavity, wherein the temperature-averaging plate 1 includes a cover plate and a bottom plate, and the cover plate and the bottom plate are sealed and connected to form a temperature-averaging cavity 11, and the first section of the tube body 21 can be arranged perpendicular to the temperature-averaging plate 1, and a plug hole 12 for connecting the first section of the tube body 21 is arranged on the cover plate, wherein the plug hole 12 has a flange structure protruding from the upper surface of the cover plate, and the insulation section of the first section of the tube body 21 is connected to the temperature-averaging plate 1 through the plug hole 12, and the insulation section of the first section of the tube body 21 is sealed and connected to the plug hole 12. The tube cavity 210 of the first section of the tube body 21 is connected to the temperature-averaging cavity 11 of the temperature-averaging plate 1 to form a three-dimensional cavity. The first section of the tube body 21 is connected to the temperature-averaging plate 1 through the plug hole 12, which has a simple structure and convenient assembly; the sealed connection in this embodiment can be connected by welding.

[0061] It can be understood that a degassing pipe 216 can be set on the temperature equalizing plate 1, and the temperature equalizing plate 1 and the first section of the heat pipe 2 can be processed and exhausted at the same time through the degassing pipe 216 on the temperature equalizing plate 1, which is convenient to process and low in cost.

[0062] As a preferred embodiment, a third capillary structure 13 is provided in the temperature-averaging chamber 11 , and a capillary connector 14 for connecting the third capillary structure 13 with the first capillary structure 211 of the first tube body 21 is provided in the temperature-averaging chamber 11 .

[0063] In this embodiment, the third capillary structure 13 is connected to the first capillary structure 211 of the first section of the tube body 21 through the capillary connector 14, and the condensed working fluid of the first section of the tube body 21 can flow directly downward to the capillary connector 14, and be quickly absorbed by the capillary connector 14, and promptly reflux and disperse to various parts of the temperature equalizing plate 1, thereby greatly improving the flow efficiency of the condensed working fluid and improving the heat dissipation effect of the heat dissipation device. In the absence of the capillary connector 14 in this example, a lot of condensed working fluid needs to accumulate at the lower port of the first section of the tube body 21. When the weight of the working fluid is greater than the capillary force, it will fall down and will not reflux in time. It should be noted that the capillary connector 14 of this embodiment is a prior art, and specific reference may be made to patent number 202222750446.9.

[0064] Example 2

[0065] See also Figure 4-7 The present invention also provides another nested phase-change heat-conducting structure. The difference between this multi-stage nested heat pipe structure and the nested phase-change heat-conducting structure of Example 1 is that the outer diameter of the evaporation section 212 of each tube section 21 except the first tube section 21 is smaller than the outer diameter of the condensation section 213, and the outer diameter of the condensation section 213 is the same as the outer diameter of the insulation section.

[0066] In this embodiment, the tube bodies 21 with multiple sections are nested and connected, except for the different tube diameters at the mutually nested and connected parts, the tube diameters at other parts are the same. The above design method is adopted to keep the whole body stable.

[0067] The present invention also provides a method for manufacturing a nested phase-change heat-conducting structure, including the above-mentioned nested phase-change heat-conducting structure, and the manufacturing method includes the following steps:

[0068] S1, the temperature averaging plate 1 sintered the third capillary structure 13 and then welded it into shape;

[0069] S2, the first tube body 21 is spun with the first capillary structure 211;

[0070] S3, assembling the first tube body 21 of step S2 onto the temperature equalizing plate 1 of step S1;

[0071] S4, then each section of the tube body 21 is sintered with the first capillary structure 211 and the second capillary structure 214, and each section of the tube body 21 after sintering is coaxially nested and connected with the previous section of the tube body 21 step by step, and finally a 3DVC heat conduction structure is formed;

[0072] S5, brazing the entire 3DVC heat-conducting structure formed in step S4;

[0073] S6. Evacuate each tube body 21 and the temperature-averaging plate 1, inject working fluid, and seal the degassing ports.

[0074] In this embodiment, after the temperature equalizing plate 1 and the first section of the tube body 21 are sintered to form capillary structures respectively, the first section of the tube body 21 is assembled on the temperature equalizing plate 1, and then the capillary structures of the other tube bodies 21 are sintered, and then each section of the tube body 21 after sintering is coaxially nested and connected with the previous section of the tube body 21 step by step, finally forming a 3DVC heat-conducting structure, and finally performing the processes of vacuuming, injecting working fluid, and sealing and degassing, which can ensure that each section of the tube body 21 has excellent performance; each section of the tube body 21 is manufactured in sections, and each tube body 21 is simple to manufacture and has high production efficiency. Finally, multiple sections of the tube body 21 are combined and welded together, which greatly reduces the manufacturing cost and improves the production efficiency while maintaining its excellent performance.

[0075] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, substitute and modify the above embodiments within the scope of the invention without departing from the principles and purpose of the present invention. All such changes should fall within the scope of protection of the claims of the present invention.

Claims

1. A nested phase change heat conductive structure, characterized in that: The invention comprises a temperature equalizing plate (1) and a heat pipe (2), wherein the heat pipe (2) comprises a plurality of tube bodies (21), wherein the plurality of tube bodies (21) are coaxially nested and connected in sequence to form a multi-stage nested heat pipe structure, wherein each tube body (21) has a tube cavity (210), wherein a hollow first capillary structure (211) is provided in the tube cavity (210), wherein the tube cavities (210) of two adjacent nested tube bodies (21) are not connected to each other, and the remaining tube bodies (21) except the first tube body (21) are evenly divided into an evaporation section (212), a condensation section (213) and an insulation section (214) located between the two sections along their length direction. The first tube section (21) is divided into an insulation section and a condensation section (213) along its length direction. The insulation section of the first tube section (21) is sealed and connected to the cavity of the temperature equalizing plate (1). Then, the evaporation section (212) of the next tube section (21) is coaxially embedded in the condensation section (213) of the previous tube section (21). The condensation section (213) of the previous tube section (21) is provided with a second capillary structure (214) at the sealing position with the evaporation section (212) of the next tube section (21). The second capillary structure (214) is connected to the first capillary structure (211).

2. The nested phase change heat conductive structure according to claim 1, characterized in that: The outer diameter of the first tube body (21) is the largest, and the outer diameter of each subsequent tube body (21) decreases in sequence, and the outer diameter of the next tube body (21) is at least 3 mm smaller than the outer diameter of the previous tube body (21).

3. The nested phase change heat conductive structure according to claim 1, characterized in that: The outer diameter of the evaporation section (212) of each section of the tube body (21) except the first section of the tube body (21) is smaller than the outer diameter of the condensation section (213), and the outer diameter of the condensation section (213) is the same as the outer diameter of the insulation section.

4. The nested phase change heat conductive structure according to claim 1, characterized in that: The second capillary structure (214) and the first capillary structure (211) are in close contact and connection with each other.

5. The nested phase change heat conductive structure according to claim 1, characterized in that: The two adjacent nested and connected tube bodies (21) are sealed and fixed at the connection position by welding.

6. The nested phase change heat conductive structure according to claim 1, characterized in that: The end of the condensation section (213) of each tube section (21) has an opening, and the opening is provided with an end cover (215). The end cover (215) is provided with an opening for inserting the evaporation section (212) of the previous tube section (21), and the second capillary structure (214) is arranged on the inner end surface of the end cover (215).

7. The nested phase-change heat-conducting structure according to claim 6, characterized in that: The end cover (215) is provided with a degassing pipe (216), and the degassing pipe (216) is in communication with the tube cavity (210).

8. The nested phase-change heat-conducting structure according to claim 1, characterized in that: The temperature equalizing plate (1) has a temperature equalizing chamber (11) and a plug hole (12) connected to the temperature equalizing chamber (11); the heat insulating section of the first section of the tube body (21) is sealedly connected to the plug hole (12); and the tube cavity (210) of the first section of the tube body (21) is connected to the temperature equalizing chamber (11).

9. The nested phase-change heat-conducting structure according to claim 8, characterized in that: A third capillary structure (13) is provided in the temperature-averaging chamber (11), and a capillary connector (14) for connecting the third capillary structure (13) to the first capillary structure (211) of the first tube body (21) is provided in the temperature-averaging chamber (11).

10. A method for manufacturing a nested phase-change thermal conductive structure, characterized in that: The nested phase-change heat-conducting structure comprising any one of claims 1 to 9, wherein the manufacturing method comprises the following steps: S1, the temperature equalizing plate (1) sintered the third capillary structure (13) and then welded it into shape; S2, sintering the first capillary structure (211) on the first tube body (21); S3, assembling the first tube body (21) of step S2 onto the temperature equalizing plate (1) of step S1; S4, then sintering each section of the tube body (21) step by step to form a first capillary structure (211), and then coaxially nesting and connecting each section of the tube body (21) after sintering with the previous section of the tube body (21) step by step, so as to finally form a 3DVC heat conduction structure; S5, brazing the entire 3DVC heat-conducting structure formed in step S4 through a furnace; S6. Evacuate each tube body (21) and the temperature-averaging plate (1), inject working fluid, and seal the gas ports.

Images