Heat pipe and processing method thereof

Abstract

The invention belongs to the technical field of heat transfer, and discloses a heat pipe and a machining method thereof. According to the heat pipe, the backflow section is arranged at the end, away from the evaporation section, of the condensation section and can exchange heat with the outside, the backflow part arranged on the backflow section can facilitate backflow of working fluid, and then the heat transfer and dissipation performance is improved; the powder mesh number of the first capillary structure of the evaporation section is larger than that of the second capillary structure of the condensation section, so that the heat resistance at the evaporation section is small, heat transfer and heat conduction are facilitated, capillary gaps at the condensation section are large, backflow of working fluid is facilitated, and the heat transfer and heat dissipation performance of the heat pipe is improved; and the evaporation section and the backflow section of the heat pipe are arranged at the included angle, so that the heat pipe can be arranged according to the actual arrangement of the chip, and the heat pipe has better universality and flexibility.

Description

Technical Field

[0001] This invention relates to the field of heat transfer technology, and more particularly to heat pipes and their processing methods. Background Technology

[0002] With the rapid development of electronic technology, the integration of chips is constantly increasing, leading to serious problems of high heat flux density and heat dissipation bottlenecks. If the heat lost by electronic devices is not dissipated in time, heat will accumulate on the chip, causing the chip temperature to rise, drastically reducing its reliability and other performance, and affecting the normal lifespan of the chip. Heat pipes are highly efficient heat conductors that utilize the principle of phase change and are widely used in the field of electronic heat dissipation.

[0003] Existing heat pipes typically have a long, strip-like structure. Some heat pipes have a powder layer filling the inner wall of the casing. This powder layer is sintered to form powder capillaries. Heat pipes generally include an evaporation section and a condensation section. The evaporation section absorbs and conducts heat from the heat source, while the condensation section releases and dissipates heat. Currently, the internal structure of heat pipes in the industry is relatively simple. However, as the heat transfer industry demands increasingly higher thermal conductivity from heat pipes, existing internal structures are no longer sufficient to meet the requirements for efficient heat transfer and dissipation. Therefore, it is necessary to improve the capillary structure inside heat pipes to enhance their heat transfer and dissipation performance. Summary of the Invention

[0004] The purpose of this invention is to provide a heat pipe and its processing method, wherein the heat pipe has good reflux effect and thus has good heat conduction effect.

[0005] On one hand, the present invention provides a heat pipe comprising:

[0006] An evaporation section, the evaporation section comprising a first tube and a first capillary structure disposed on the inner wall of the first tube;

[0007] The condensation section includes a second tube and a second capillary structure disposed on the inner wall of the second tube, wherein the powder mesh size of the second capillary structure is smaller than that of the first capillary structure.

[0008] The reflux section extends at an angle to the evaporation section. The reflux section includes a third tube and a reflux portion disposed on the inner wall of the third tube. The first tube is connected to the third tube through the second tube.

[0009] In some embodiments, the reflux section includes a plurality of reflux grooves circumferentially spaced along the inner wall of the third tube, and the reflux grooves extend to the connection between the second tube and the third tube.

[0010] In some embodiments, the cross-section of the reflux channel gradually increases along the direction close to the axis of the third tube.

[0011] In some embodiments, multiple evaporation sections, condensation sections, and reflux sections are provided. Along the extension direction of the heat pipe, several evaporation sections and reflux sections are arranged alternately, and a condensation section is provided between any two adjacent evaporation sections and reflux sections.

[0012] In some embodiments, the condensation section directly connected to the evaporation section includes a first condensation section, a second condensation section, and a transition section connected in sequence. The extension directions of the first condensation section and the second condensation section are set at an angle, the transition section is bent, the first condensation section is connected to the evaporation section, and the second condensation section is connected to the reflux section.

[0013] In some embodiments, each end of the evaporation section is connected to a condensation section, and each condensation section is connected to a reflux section.

[0014] In some embodiments, the length of the first condensation section is less than the length of the second condensation section.

[0015] In some embodiments, the radial thickness of the first capillary structure is the same as the radial thickness of the second capillary structure.

[0016] The heat pipe provided by this invention has at least the following beneficial effects:

[0017] The heat pipe provided by this invention includes an evaporation section, a condensation section, and a reflux section. The evaporation section includes a first tube body and a first capillary structure disposed on the inner wall of the first tube body. The condensation section includes a second tube body and a second capillary structure disposed on the inner wall of the second tube body. The powder mesh size of the second capillary structure is smaller than that of the first capillary structure. The extension direction of the reflux section is set at an angle to the extension direction of the evaporation section. The reflux section includes a third tube body and a reflux portion disposed on the inner wall of the third tube body. The first tube body is connected to the third tube body through the second tube body. This angular arrangement of the evaporation and reflux sections in the heat pipe allows for flexible heat pipe placement based on the actual chip layout, resulting in better versatility. Furthermore, the powder mesh size of the first capillary structure in the evaporation section is larger than that of the second capillary structure in the condensation section. The relatively smaller particle size of the powder corresponding to the first capillary structure results in a larger contact area between the powder particles, leading to lower thermal resistance in the evaporation section and facilitating heat transfer. Conversely, the relatively larger particle size of the powder corresponding to the second capillary structure results in a larger capillary gap in the condensation section, facilitating the reflux of the working fluid and improving the heat transfer and heat dissipation performance of the heat pipe. Furthermore, a reflux section is provided on the side of the condensation section away from the evaporation section. The reflux section can exchange heat with the outside environment, and the reflux section can facilitate the return of the working fluid, thereby further improving the heat transfer and heat dissipation performance.

[0018] On the other hand, the present invention provides a processing method for the above-mentioned heat pipe, the processing method comprising:

[0019] S10. Cut a pipe of a preset length and process a return groove at a preset position on the pipe;

[0020] S20. Using a mandrel, fill the tube with first capillary powder and second capillary powder, and sinter the tube, the first capillary powder and the second capillary powder to form a transition tube.

[0021] S30. Seal both ends of the transition tube and bend the transition tube to form the heat pipe.

[0022] In some embodiments, the mandrel includes a rod body and a limiting block, the rod body includes a capillary segment and an adjusting segment, and the limiting block is adjustablely disposed in the adjusting segment; S20 includes:

[0023] S21. Adjust the limiting block to the target position of the adjusting section, extend one end of the capillary segment of the mandrel into the tube, and make the limiting block abut against the tube, and fill the tube with one of the first capillary powder and the second capillary powder of a first preset length.

[0024] S22. Keeping the position of the mandrel unchanged, fill the tube with a second preset length of one of the first capillary powder and the second capillary powder.

[0025] The processing method provided by this invention has at least the following beneficial effects:

[0026] This processing method allows for the convenient and efficient filling of the tube with capillary powder of a predetermined thickness using a mandrel, resulting in high processing efficiency and good product consistency for the heat pipe. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the heat pipe structure according to an embodiment of the present invention;

[0028] Figure 2 This is a front view of the heat pipe according to an embodiment of the present invention;

[0029] Figure 3 yes Figure 2 An enlarged schematic diagram of the cross-sectional view at point AA;

[0030] Figure 4 yes Figure 2 Enlarged schematic diagram of the cross-sectional view at point BB;

[0031] Figure 5 yes Figure 2 An enlarged schematic diagram of the cross-sectional view at point CC;

[0032] Figure 6 yes Figure 5 A magnified view of a section at point D;

[0033] Figure 7 This is a flowchart of the heat pipe processing method according to an embodiment of the present invention.

[0034] In the picture:

[0035] 10. Evaporation section; 11. First tube body; 12. First capillary structure;

[0036] 20. Condensation section; 21. Second tube body; 22. Second capillary structure; 23. First condensation section; 24. Second condensation section; 25. Transition section;

[0037] 30. Reflux section; 31. Third pipe body; 32. Reflux trough. Detailed Implementation

[0038] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0042] like Figures 1 to 6As shown, this embodiment provides a heat pipe, which includes an evaporation section 10, a condensation section 20, and a reflux section 30. The evaporation section 10 includes a first tube body 11 and a first capillary structure 12 disposed on the inner wall of the first tube body 11. The condensation section 20 includes a second tube body 21 and a second capillary structure 22 disposed on the inner wall of the second tube body 21. The powder mesh size of the second capillary structure 22 is smaller than that of the first capillary structure 12. The extension direction of the reflux section 30 is set at an angle to the extension direction of the evaporation section 10. The reflux section 30 includes a third tube body 31 and a reflux portion disposed on the inner wall of the third tube body 31. The first tube body 11 is connected to the third tube body 31 through the second tube body 21. Specifically, in this embodiment, the evaporation section 10 and the reflux section 30 of this heat pipe are arranged at an angle, allowing for heat pipe arrangement based on the actual chip layout, resulting in better versatility. Furthermore, the powder mesh size of the first capillary structure 12 in the evaporation section 10 is greater than that of the second capillary structure 22 in the condensation section 20. The powder particle size corresponding to the first capillary structure 12 is relatively small, resulting in a larger contact area between the powder particles, thus lowering the thermal resistance at the evaporation section 10 and facilitating heat transfer. Conversely, the powder particle size corresponding to the second capillary structure 22 is relatively large, resulting in a larger capillary gap at the condensation section 20, facilitating the reflux of the working fluid and improving the heat transfer and heat dissipation performance of the heat pipe. Additionally, a reflux section 30 is provided on the side of the condensation section 20 away from the evaporation section 10. The reflux section 30 can exchange heat with the outside environment, and the reflux portion of the reflux section 30 facilitates the reflux of the working fluid, further enhancing the heat transfer and heat dissipation performance.

[0043] Furthermore, the reflux section includes a plurality of reflux grooves 32 spaced circumferentially along the inner wall of the third tube 31, and the reflux grooves 32 extend to the connection between the second tube 21 and the third tube 31. Specifically, in this embodiment, the arrangement of the reflux grooves 32 can, on the one hand, increase the contact area inside the reflux section 30, which is beneficial to improving the heat exchange efficiency; on the other hand, it allows the liquefied working fluid to be stored in the reflux grooves 32, which is beneficial to improving the liquid reflux effect, and thus further improving the heat exchange efficiency of the heat pipe.

[0044] In some embodiments, the number and size of the return channels 32 are specifically set according to actual use, and are not limited here.

[0045] In some embodiments, the cross-section of the return channel 32 gradually increases along the axis close to the third tube 31. Specifically, in this embodiment, this arrangement facilitates the collection of liquefied working fluid, and the gradually decreasing cross-sectional area makes it easier for the dispersed liquefied working fluid collected in the return channel 32 to aggregate into larger working fluid particles, thereby improving the return effect of the working fluid and improving the heat exchange efficiency of the heat pipe.

[0046] In some embodiments, along the radial direction of the heat pipe, the distance between the bottom of the reflux groove 32 and the outer wall of the third tube 31 is greater than the distance between the bottom of the second capillary structure 22 and the outer wall of the second tube 21; and / or, along the radial direction of the heat pipe, the distance between the opening of the reflux groove 32 and the outer wall of the third tube 31 is less than the distance between the top of the second capillary structure 22 and the outer wall of the second tube 21. Specifically, in this embodiment, this arrangement facilitates the reflux of the liquefied working fluid in the reflux groove 32 through the second capillary structure 22, thereby improving the heat exchange efficiency of the heat pipe.

[0047] In some embodiments, the cross-sectional shape of the reflux trough 32 is "V" shaped. In other embodiments, the cross-sectional shape of the reflux trough 32 can be specifically set according to actual use, such as trapezoidal, etc., without specific limitations.

[0048] In some embodiments, multiple evaporation sections 10, condensation sections 20, and reflux sections 30 are provided. Along the extension direction of the heat pipe, several evaporation sections 10 and several reflux sections 30 are arranged alternately, and a condensation section 20 is provided between any two adjacent evaporation sections 10 and reflux sections 30. Specifically, in this embodiment, this arrangement enables the heat pipe to be used in situations with multiple heat sources, facilitating practical application; and the provision of a condensation section 20 between any two adjacent evaporation sections 10 and reflux sections 30 ensures heat exchange efficiency and improves performance.

[0049] In some embodiments, the condensing section 20 directly connected to the evaporating section 10 includes a first condensing section 23, a second condensing section 24, and a transition section 25 connected in sequence. The extending directions of the first condensing section 23 and the second condensing section 24 are set at an angle, and the transition section 25 is bent. The first condensing section 23 is connected to the evaporating section 10, and the second condensing section 24 is connected to the reflux section 30. Specifically, in this embodiment, this arrangement ensures that both the evaporating section 10 and the reflux section 30 are straight sections, ensuring convenient connection of the evaporating section 10 to the heat source, while ensuring good reflux effect of the reflux section 30, thereby ensuring the performance of the heat pipe. Furthermore, the arrangement of the transition section 25 allows the evaporating section 10 and the reflux section 30 to be adjusted according to the location of the heat source and cold source, improving the versatility of the heat pipe.

[0050] In some embodiments, each end of the evaporation section 10 is connected to a condensation section 20, and each condensation section 20 is connected to a reflux section 30. Specifically, the heat pipe in this embodiment includes an evaporation section 10, two condensation sections 20, and two reflux sections 30. The two condensation sections 20 are respectively located at both ends of the evaporation section 10, and the two reflux sections 30 are respectively located at the ends of the two condensation sections 20 away from the evaporation section 10. This allows the heat pipe to be used in scenarios with one heat source and two cold sources, and the angles of the evaporation section 10 and the two reflux sections 30 can be adaptively changed according to the usage scenario, providing good flexibility in use.

[0051] In some embodiments, the length of the first condensing section 23 is less than the length of the second condensing section 24. Specifically, in this embodiment, this arrangement allows the second condensing section 24 of the condensing section 20 to be located away from the heat source, thereby reducing the impact of the heat source on the heat exchange efficiency of the condensing section 20 and improving the heat exchange efficiency of the heat pipe.

[0052] In some embodiments, the first condensing section 23 and the second condensing section 24 of the condensing section 20 are located on the same plane and the first condensing section 23 and the second condensing section 24 are perpendicular, thereby making the heat pipe as a whole have a "U" shaped structure.

[0053] In some embodiments, the first condensation section 23 and the second condensation section 24 may not be located on the same plane, and no specific limitation is made here.

[0054] Furthermore, the radial thickness of the first capillary structure 12 is the same as the radial thickness of the second capillary structure 22. Specifically, in this embodiment, the radial thickness of the first powder capillary is the same as the radial thickness of the second powder capillary, so the same mandrel can be used for filling the powder, which facilitates the filling of capillary powder and makes it easy to use.

[0055] Alternatively, in another embodiment, the radial thickness of the first powder capillary can be different from that of the second powder capillary, and can be specifically set according to actual usage needs.

[0056] This embodiment also provides a processing method for processing the above-mentioned heat pipe, the processing method comprising:

[0057] S10. Cut a pipe of a preset length and process a return groove 32 at a preset position on the pipe.

[0058] Specifically, in this embodiment, a heat pipe comprising an evaporation section 10, two condensation sections 20, and two reflux sections 30 will be used as an example for detailed description.

[0059] First, cut the pipe to a preset length using a cutting machine or machining. Then, divide the pipe into a first pipe, two second pipes, and two third pipes. Machining is used to process reflux grooves 32 on the inner wall of the two third pipes to ensure the reflux effect.

[0060] S20. Using a mandrel, fill the tube with first capillary powder and second capillary powder, and sinter the tube, first capillary powder and second capillary powder to form a transition tube.

[0061] Specifically, in this embodiment, a mandrel is used to fill the first second tube with second capillary powder, then a mandrel is used to fill the first tube with first capillary powder, and finally a mandrel is used to fill the second second tube with second capillary powder, and then the tube is sintered to form a transition tube.

[0062] In another embodiment, the first capillary powder can be filled into the first tube using a mandrel first, and then the second capillary powder can be filled into the two second tubes using mandrels respectively. No specific limitation is made here.

[0063] Specifically, in this embodiment, the core rod includes a rod body and a limiting block. The rod body includes a capillary segment and an adjusting segment. The limiting block is adjustablely positioned in the adjusting segment. S20 includes the following steps:

[0064] S21. Adjust the limiting block to the target position of the adjustment section, insert one end of the capillary section of the mandrel into the tube, and make the limiting block abut against the tube, and fill the tube with one of the first capillary powder and the second capillary powder of the first preset length.

[0065] Specifically, in this embodiment, taking the filling of the second capillary powder with a mandrel at the first second tube, the filling of the first capillary powder with a mandrel at the first tube, and the filling of the second capillary powder with a mandrel at the second second tube as an example, and then sintering it, the limiting block is adjusted to the target position of the adjusting section, one end of the capillary section of the mandrel is inserted into the tube, the limiting block abuts against the tube, at this time, part of the adjusting section is inserted into the tube, and the outer diameter of the adjusting section is matched with the inner diameter of the tube, so that the gap between the adjusting section and the tube is small, and the distance between the outer diameter of the capillary section and the inner diameter of the tube is the radial thickness of the first capillary structure 12 and / or the second capillary structure 22.

[0066] When the limiting block is at the target position of the adjustment section, the end of the adjustment section near the capillary section is flush with the starting end of one of the second pipe fittings, and then the second capillary powder of a first preset length is filled into the pipe fitting.

[0067] S20. Keeping the mandrel in its current position, fill the tube with another of the first and second capillary powders of a second preset length.

[0068] Specifically, in this embodiment, after the first filling of the second capillary powder is completed, the position of the core rod remains unchanged, and the first capillary powder of a second preset length is continued to be filled to ensure that the mesh size of the capillary powder in the evaporation section 10 and the capillary powder in the condensation section 20 are different, so as to ensure the performance of the heat pipe.

[0069] Specifically, in this embodiment, after filling the first capillary powder of the second preset length is completed, it is also necessary to continue filling the second capillary powder of the first preset length to ensure that both ends of the evaporation section 10 are connected to the condensation section 20. This will not be described in detail here.

[0070] S30. Seal both ends of the transition pipe and bend the transition pipe to form a heat pipe.

[0071] Specifically, in this embodiment, the two ends of the transition pipe are sealed by welding, the weld is ground smooth, and then the transition pipe is bent by a bending machine to form a heat pipe.

[0072] Welding not only ensures the sealing performance of the heat pipe, but also has the advantage of low processing cost.

[0073] Furthermore, a bending machine is used to bend the heat pipe at the two condensation sections 20 to ensure that the heat pipe can be used in situations where the hot and cold ends are at an angle, thus ensuring the performance of the heat pipe.

[0074] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A heat pipe, characterized in that, include: Evaporation section (10), the evaporation section (10) includes a first tube (11) and a first capillary structure (12) disposed on the inner wall of the first tube (11); The condensation section (20) includes a second tube (21) and a second capillary structure (22) disposed on the inner wall of the second tube (21). The powder mesh number of the second capillary structure (22) is smaller than that of the powder mesh number of the first capillary structure (12). The reflux section (30) extends at an angle to the evaporation section (10). The reflux section (30) includes a third tube (31) and a reflux portion disposed on the inner wall of the third tube (31). The first tube (11) is connected to the third tube (31) through the second tube (21).

2. The heat pipe according to claim 1, characterized in that, The reflux section includes a plurality of reflux grooves (32) arranged circumferentially along the inner wall of the third tube (31), and the reflux grooves (32) extend to the connection between the second tube (21) and the third tube (31).

3. The heat pipe according to claim 2, characterized in that, Along the direction close to the axis of the third tube (31), the cross-section of the return channel (32) gradually increases.

4. The heat pipe according to claim 1, characterized in that, The evaporation section (10), the condensation section (20) and the reflux section (30) are provided in multiples. Along the extension direction of the heat pipe, several evaporation sections (10) and reflux sections (30) are arranged alternately, and a condensation section (20) is provided between any two adjacent evaporation sections (10) and reflux sections (30).

5. The heat pipe according to claim 4, characterized in that, The condensing section (20) directly connected to the evaporating section (10) includes a first condensing section (23), a second condensing section (24) and a transition section (25) connected in sequence. The extension direction of the first condensing section (23) and the extension direction of the second condensing section (24) are set at an angle. The transition section (25) is bent. The first condensing section (23) is connected to the evaporating section (10), and the second condensing section (24) is connected to the reflux section (30).

6. The heat pipe according to claim 5, characterized in that, The two ends of the evaporation section (10) are respectively connected to a condensation section (20), and each condensation section (20) is connected to a reflux section (30).

7. The heat pipe according to claim 5, characterized in that, The length of the first condensation section (23) is less than the length of the second condensation section (24).

8. The heat pipe according to any one of claims 1-7, characterized in that, The radial thickness of the first capillary structure (12) is the same as the radial thickness of the second capillary structure (22).

9. A processing method, said processing method being used to process the heat pipe according to any one of claims 1-8, characterized in that, The processing method includes: S10. Cut a pipe of a preset length and process a return groove (32) at a preset position on the pipe. S20. Using a mandrel, fill the tube with first capillary powder and second capillary powder, and sinter the tube, the first capillary powder and the second capillary powder to form a transition tube. S30. Seal both ends of the transition tube and bend the transition tube to form the heat pipe.

10. The processing method according to claim 9, characterized in that, The core rod includes a rod body and a limiting block. The rod body includes a capillary segment and an adjusting segment. The limiting block is adjustablely positioned within the adjusting segment. Step S20 includes: S21. Adjust the limiting block to the target position of the adjusting section, extend one end of the capillary segment of the mandrel into the tube, and make the limiting block abut against the tube, and fill the tube with one of the first capillary powder and the second capillary powder of a first preset length. S22. Keeping the position of the mandrel unchanged, fill the tube with a second preset length of one of the first capillary powder and the second capillary powder.

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