Improved composite heat pipe and manufacturing method thereof
By setting up a reflux structure with different porosities in the heat pipe and using fine copper powder and coarse copper powder materials, the structural denseness and thermal resistance increase caused by excessive copper powder in existing heat pipes are solved, achieving more efficient heat conduction and reducing the risk of thermal failure.
Patent Information
- Application Number
- CN202510324644.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-19
- Publication Date
- 2025-05-09
AI Technical Summary
The use of more copper powder in existing heat pipes leads to a dense structure after sintering, a decrease in porosity, an increase in thermal resistance, and is prone to local dry burning to cause thermal failure.
The first reflow structure and the second reflow structure with different porosities are adopted. The first reflow structure uses fine copper powder material with low porosity, while the second reflow structure uses crude copper powder material with high porosity, and a composite heat pipe structure is formed through sintering.
It effectively avoids the problems of dense structure and reduced porosity, reduces thermal resistance, improves thermal conductivity, and reduces the risk of thermal failure caused by local dry burning.
Smart Images
Figure CN119958340A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of radiator heat pipe production, in particular to an improved composite heat pipe and a manufacturing method thereof. Background Art
[0002] Generally, electronic devices or machinery and equipment will generate high temperatures when in operation, so manufacturers usually install heat pipes to dissipate heat. Heat pipes use the evaporation and condensation of internal coolant to achieve a rapid temperature equalization effect. In detail, after the liquid coolant in the heat pipe absorbs heat at the evaporation end, the liquid coolant vaporizes and moves to the condensation end due to vapor pressure. After the gaseous coolant at the condensation end releases heat and condenses into liquid coolant, the liquid coolant flows back to the evaporation end through the internal capillary structure, absorbs heat again and evaporates, thereby performing a cooling cycle.
[0003] At present, existing heat pipes are usually formed with grooves that are interconnected from beginning to end, and a copper powder layer is sintered on the grooves. In order to ensure the capillary force of the heat pipe, the capillary force is improved by increasing the amount of copper powder during sintering. However, more copper powder is used in existing heat pipes, and the structure after sintering is denser, the porosity decreases, resulting in increased thermal resistance, and it is easy to cause thermal conductivity failure due to local dry burning.
[0004] Therefore, it is necessary to study a new technical solution to solve the above problems. Summary of the invention
[0005] In view of this, the present invention aims to solve the deficiencies in the prior art, and its main purpose is to provide an improved composite heat pipe.
[0006] To achieve the above purpose, the present invention adopts the following technical solutions:
[0007] An improved composite heat pipe comprises a tube shell, both ends of which are closed, and a fluid is arranged in the tube shell, including a heated zone, an insulating zone and a condensing zone; a first reflux structure is arranged in the heated zone, and a first groove is arranged between the heated zone and the first reflux structure; the insulating zone is arranged on one side of the heated zone; a second reflux structure is arranged in the insulating zone, and a second groove is arranged between the insulating zone and the second reflux structure; the condensing zone is arranged on one side of the insulating zone; a third groove is arranged on the inner wall of the condensing zone; the heated zone, the insulating zone and the condensing zone are arranged in sequence in the tube shell along the fluid flow direction, and the heated zone, the insulating zone and the condensing zone are connected end to end; the porosity of the first reflux structure is lower than the porosity of the second reflux structure.
[0008] As a further explanation, the first reflow structure is made of a fine copper powder material; the second reflow structure is made of a coarse copper powder material; the particle diameter of the fine copper powder is smaller than the particle diameter of the coarse copper powder.
[0009] As a further explanation, the first reflux structure and the first groove are sintered integrally; the second reflux structure and the second groove are sintered integrally; the cross-sectional shape of the first reflux structure is a uniformly distributed or unevenly distributed honeycomb, and the cross-sectional shape of the second reflux structure is an irregular or regular polygon.
[0010] As a further explanation, a plurality of groups of air pipes distributed at equal intervals are provided on the outside of the third groove; the plurality of groups of air pipes form a powder-free air channel for reducing the thermal resistance of the heat pipe, and the width of the powder-free air channel is 0.4-0.5 mm.
[0011] As a further illustration, the mesh size of the fine copper powder is 120-150 meshes; the mesh size of the coarse copper powder is 70-80 meshes.
[0012] As a further explanation, the first groove is arranged in a spiral structure; the second groove is arranged in a stripe or spiral structure; and the third groove is arranged in a stripe or spiral structure.
[0013] As a further elaboration, a first groove section and a second groove section are provided in the second groove; the first groove section and the second groove section are connected end to end, and the sizes of the first groove section and the second groove section gradually decrease along the fluid flow direction; the size of the first groove is larger than the size of the first groove section; the size of the second groove section is larger than the size of the third groove;
[0014] Wherein, the groove depth of the second groove section is 0.6 times that of the first groove section.
[0015] As a further explanation, the first groove and the third groove are arranged in a polygonal structure; the first groove segment is arranged in a triangular structure, and the second groove segment is arranged in a rectangular or trapezoidal structure.
[0016] As a further explanation, a graphene composite layer is provided in the condensation zone, and the graphene composite layer is wrapped around the outside of the third groove and has a thickness of 120-150 nm.
[0017] A method for manufacturing a composite structure comprises the following steps:
[0018] a) preparing a tube shell, wherein three grooves are sequentially formed inside the tube shell, namely, a first groove, a second groove and a third groove;
[0019] b) inserting a stopper rod into the tube shell, wherein the upper and middle sections of the stopper rod are thinner and defined as a thin section, and the lower section of the stopper rod is thicker and defined as a thick section, and the circumference of the thick section is in conflict with the grooves of the tube shell, and the circumference of the thin section is separated from the inner wall of the tube shell by a predetermined distance to form an upper accommodating space and a lower accommodating space;
[0020] c) throwing coarse copper powder from the top of the tube shell so that the coarse copper powder falls into the lower accommodation space, and then throwing fine copper powder so that the fine copper powder falls into the lower accommodation space;
[0021] d) Sintering and sealing: Sintering the tube shell so that the coarse copper powder and the fine copper powder inside the tube shell are sintered and fixed to the second groove and the first groove of the tube shell respectively, and then sealing one end of the tube shell, adding an actuating fluid into the tube shell to degas, and then sealing the other end of the tube shell; wherein, the stopper rod is sintered together with the tube shell and then the stopper rod is pulled out.
[0022] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical solution that:
[0023] By setting a first reflux structure and a second reflux structure with different porosities, and the first reflux structure uses fine copper powder material with low porosity, while the second reflux structure uses coarse copper powder material with high porosity, it is beneficial to the smooth flow of steam and the reflux of condensate, and effectively avoids the problems of dense structure and decreased porosity caused by excessive copper powder in the existing heat pipe, thereby reducing thermal resistance and improving heat conduction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0025] Figure 1 A schematic diagram of the overall structure of an improved composite heat pipe provided by the present invention;
[0026] Figure 2 A schematic diagram of the internal structure of an improved composite heat pipe provided by the present invention;
[0027] Figure 3 A schematic diagram of the internal structure of the condensation zone provided by the present invention;
[0028] Figure 4 A schematic diagram of the cross-sectional structure of the heating zone provided by the present invention;
[0029] Figure 5 A schematic diagram of the cross-sectional structure of the first slot section of the thermal insulation zone provided by the present invention;
[0030] Figure 6 A schematic diagram of the cross-sectional structure of the second slot section of the thermal insulation zone provided by the present invention;
[0031] Figure 7A schematic diagram of the cross-sectional structure of the condensation zone provided by the present invention;
[0032] Figure 8 A schematic flow chart of a method for manufacturing a composite heat pipe provided by the present invention.
[0033] Among them, the reference numerals in the figure are:
[0034] 10. Heating zone; 11. Insulating zone; 12. Condensation zone; 20. First reflux structure; 21. First groove; 30. Second reflux structure; 31. Second groove; 311. First groove section; 312. Second groove section; 40. Third groove; 42. Graphene composite layer. DETAILED DESCRIPTION
[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0037] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0039] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.
[0040] In one embodiment of the present invention, Figure 1-8As shown, an improved composite heat pipe is provided, including a tube shell, the two ends of the tube shell are closed, and a fluid is arranged in the tube shell, including a heating zone 10, an insulating zone 11 and a condensing zone 12. A first reflux structure 20 is arranged in the heating zone 10, and a first groove 21 is arranged between the heating zone 10 and the first reflux structure 20. The insulating zone 11 is arranged on one side of the heating zone 10. A second reflux structure 30 is arranged in the insulating zone 11, and a second groove 31 is arranged between the insulating zone 11 and the second reflux structure 30. The condensing zone 12 is arranged on one side of the insulating zone 11. A third groove 40 is arranged on the inner wall of the condensing zone 12. The heating zone 10, the insulating zone 11, and the condensing zone 12 are arranged in sequence in the tube shell along the fluid flow direction, and the heating zone 10, the insulating zone 11, and the condensing zone 12 are connected end to end. The porosity of the first reflux structure 20 is lower than the porosity of the second reflux structure 30.
[0041] In this embodiment, the length of the insulation zone 11 is 0.6 times that of the heating zone 10. By setting the heating zone 10 and the insulation zone 11 of different lengths, and the length of the heating zone 10 is the same as that of the condensation zone 12. The longer heating zone 10 can more fully absorb the heat generated by the heat source, ensuring that the heat is effectively transferred to the working fluid inside the heat pipe, and the shorter insulation zone 11 can reduce the lateral conduction loss of heat, avoid unnecessary partial absorption or loss of heat during the transmission process, and reduce the influence of the external environment on the temperature field distribution inside the heat pipe. At the same time, the condensation zone 12 is the same length as the heating zone 10, which can ensure that the heat transferred from the heating zone 10 is fully released in the condensation zone 12, thereby improving the heat dissipation efficiency.
[0042] Preferably, in this embodiment, the first groove 21 , the second groove 31 and the third groove 40 have the same size.
[0043] The first reflux structure 20 is made of a fine copper powder material. The second reflux structure 30 is made of a coarse copper powder material. The particle diameter of the fine copper powder is smaller than the particle diameter of the coarse copper powder. By using fine copper powder and coarse copper powder with different particle diameters, the porosity of the first reflux structure 20 and the second reflux structure 30 is differentiated. Among them, the first reflux structure 20 located in the heated area 10 uses a fine copper powder material with a relatively low porosity, which promotes the rapid evaporation of the fluid, while the second reflux structure 30 located in the insulation area 11 uses a coarse copper powder material with a relatively high porosity, which is conducive to the smooth transmission of steam and the smooth reflux of the condensate, effectively avoiding the problem of overly dense structure and reduced porosity caused by excessive use of copper powder in traditional heat pipes, thereby significantly reducing thermal resistance and greatly improving heat conduction efficiency.
[0044] Furthermore, the first reflux structure 20 and the first groove 21 are integrally sintered. The second reflux structure 30 and the second groove 31 are integrally sintered. The cross-sectional shape of the first reflux structure 20 is a uniformly distributed or unevenly distributed honeycomb, and the cross-sectional shape of the second reflux structure 30 is an irregular or regular polygon. In this embodiment, the corresponding cross-sectional shape is selected according to different occasions, and the cross-sectional shape of the capillary structure is optimized to reduce the flow resistance of the fluid in the capillary structure, improve the heat conduction efficiency, and thus reduce the risk of heat conduction failure caused by local dry burning.
[0045] Furthermore, multiple groups of air pipes are arranged at equal intervals outside the third groove 40. Multiple groups of air pipes form a powder-free air channel for reducing the thermal resistance of the heat pipe. The width of the powder-free air channel is 0.4-0.5 mm, and the diameter of the powder-free air channel is preferably 0.4 mm. By providing the powder-free air channel, the thermal resistance inside the heat pipe is effectively reduced, the heat dissipation efficiency is improved, and the problem of thermal conductivity failure caused by local dry burning is avoided.
[0046] Furthermore, the mesh number of the fine copper powder is 120-150 meshes. The mesh number of the coarse copper powder is 70-80 meshes. In the present embodiment, the mesh number of the fine copper powder is preferably 150 meshes, and the mesh number of the coarse copper powder is preferably 70 meshes. Such a combination makes the porosity difference between the first reflux structure 20 and the second reflux structure 30 greater, and the heated area 10 can more fully absorb the heat generated by the heat source, ensuring that the heat is effectively transferred to the working fluid inside the heat pipe, and the shorter insulation area 11 can reduce the lateral conduction loss of heat, avoiding unnecessary partial absorption or loss of heat during the transmission process.
[0047] Preferably, the first groove 21 is arranged in a spiral structure. The second groove 31 is arranged in a strip or spiral structure. The third groove 40 is arranged in a strip or spiral structure. By providing a spiral or strip structure groove mechanism, the heat dissipation area is effectively increased, the heat dissipation efficiency is improved, thereby reducing the operating temperature of the heat pipe and reducing the risk of thermal failure caused by local dry burning.
[0048] Preferably, in another embodiment, the sizes of the first groove 21 , the second groove 31 and the third groove 40 are designed to decrease in sequence along the fluid flow direction.
[0049] The second groove 31 is provided with a first groove section 311 and a second groove section 312. The first groove section 311 and the second groove section 312 are connected end to end, and the sizes of the first groove section 311 and the second groove section 312 gradually decrease along the fluid flow direction. The size of the first groove 21 is larger than the size of the first groove section 311. The size of the second groove section 312 is larger than the size of the third groove 40. The groove depth of the second groove section 312 is 0.6 times that of the first groove section 311. By providing a stepped groove section with gradually decreasing size, the flow resistance of the fluid in the groove is reduced, the heat conduction efficiency is improved, and the thermal resistance is further reduced.
[0050] Furthermore, the first groove 21 and the third groove 40 are arranged in a polygonal structure. The first groove section 311 is arranged in a triangular structure, and the second groove section 312 is arranged in a rectangular or trapezoidal structure. By optimizing the shape design of each groove, the eddy current and turbulence of the fluid in the groove are reduced, the heat conduction efficiency is improved, and the thermal resistance is further reduced.
[0051] Preferably, a graphene composite layer 42 is provided in the condensation zone 12, the graphene composite layer 42 is wrapped around the outside of the third groove 40, and has a thickness of 120-150 nm, preferably 120 mm. In this embodiment, the graphene composite layer 42 has high thermal conductivity, accelerates heat conduction, improves heat transfer efficiency, and has super hydrophilic properties, which can reduce the flow resistance of liquid in the wick. By providing the graphene composite layer 42, the thermal conductivity and heat dissipation efficiency of the heat pipe are improved, the thermal resistance is reduced, and thus the overall performance of the heat pipe is improved.
[0052] A method for manufacturing a composite heat pipe comprises the following steps:
[0053] a) preparing a tube shell, wherein three grooves are sequentially formed inside the tube shell, namely, a first groove 21, a second groove 31 and a third groove 40,
[0054] In this embodiment, the first groove 21, the second groove 31 and the third groove 40 have the same size, so as to facilitate the processing of the heat pipe and simplify the processing steps.
[0055] b) inserting a stopper rod into the tube shell, wherein the upper and middle sections of the stopper rod are thinner and defined as a thin section, and the lower section of the stopper rod is thicker and defined as a thick section, and the circumference of the thick section is in conflict with the grooves of the tube shell, and the circumference of the thin section is separated from the inner wall surface of the tube shell by a predetermined distance to form an upper accommodating space and a lower accommodating space.
[0056] c) throwing coarse copper powder from the top of the tube shell so that the coarse copper powder falls into the lower accommodating space, and then throwing fine copper powder so that the fine copper powder falls into the lower accommodating space.
[0057] d) Sintering and sealing: The tube shell is sintered to fix the coarse copper powder and fine copper powder inside the tube shell to the second groove 31 and the first groove 21 of the tube shell respectively, and then one end of the tube shell is sealed, and the actuating fluid is added into the tube shell to degas, and then the other end of the tube shell is sealed. The stopper rod is sintered together with the tube shell and then the stopper rod is pulled out.
[0058] A method for manufacturing a composite heat pipe comprises the following steps:
[0059] a) preparing a tube shell, wherein three grooves are sequentially formed inside the tube shell, namely, a first groove 21, a second groove 31 and a third groove 40,
[0060] In another embodiment, the sizes of the first groove 21, the second groove 31 and the third groove 40 decrease in sequence along the fluid flow direction, and the second groove 31 is composed of two groups of first groove sections 311 and second groove sections 312 of different sizes. By providing stepped groove sections with gradually decreasing sizes, the flow resistance of the fluid in the groove is reduced, the heat conduction efficiency is improved, and the thermal resistance is further reduced.
[0061] b) inserting a stopper rod into the tube shell, wherein the upper and middle sections of the stopper rod are thinner and defined as a thin section, and the lower section of the stopper rod is thicker and defined as a thick section, and the circumference of the thick section is in conflict with the grooves of the tube shell, and the circumference of the thin section is separated from the inner wall surface of the tube shell by a predetermined distance to form an upper accommodating space and a lower accommodating space.
[0062] c) throwing coarse copper powder from the top of the tube shell so that the coarse copper powder falls into the lower accommodating space, and then throwing fine copper powder so that the fine copper powder falls into the lower accommodating space.
[0063] d) Sintering and sealing: The tube shell is sintered to fix the coarse copper powder and fine copper powder inside the tube shell to the second groove 31 and the first groove 21 of the tube shell respectively, and then one end of the tube shell is sealed, and the actuating fluid is added into the tube shell to degas, and then the other end of the tube shell is sealed. The stopper rod is sintered together with the tube shell and then the stopper rod is pulled out.
[0064] By setting a first reflux structure 20 and a second reflux structure 30 with different porosities, and the first reflux structure 20 uses fine copper powder material with a lower porosity, while the second reflux structure 30 uses coarse copper powder material with a higher porosity, it is beneficial to the smooth flow of steam and the reflux of condensate, and effectively avoids the problem of dense structure and decreased porosity caused by excessive copper powder in the existing heat pipe, thereby reducing thermal resistance and improving heat conduction efficiency.
[0065] The above are only preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for explaining the principles of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, and other specific implementations of the present invention that can be associated with by technicians in this field without creative labor, should be included in the scope of protection of the present invention.
Claims
1. An improved composite heat pipe, comprising a tube shell, the two ends of the tube shell are closed, and a fluid is arranged in the tube shell, characterized in that: include: A heated zone, wherein a first reflux structure is disposed in the heated zone, and a first groove is disposed between the heated zone and the first reflux structure; A heat-insulating area, the heat-insulating area is arranged on one side of the heated area; the heat-insulating area is provided with a second reflux structure, and a second groove is provided between the heat-insulating area and the second reflux structure; A condensation zone, the condensation zone is arranged on one side of the insulation zone; a third groove is arranged on the inner wall of the condensation zone; Among them, the heated zone, the insulating zone, and the condensing zone are arranged in sequence in the tube shell along the fluid flow direction, and the heated zone, the insulating zone, and the condensing zone are connected end to end; the porosity of the first reflux structure is lower than the porosity of the second reflux structure.
2. The improved composite heat pipe according to claim 1, characterized in that: The first reflow structure is made of fine copper powder material in one piece; the second reflow structure is made of coarse copper powder material in one piece; the particle diameter of the fine copper powder is smaller than the particle diameter of the coarse copper powder.
3. The improved composite heat pipe according to claim 2, characterized in that: The first reflux structure and the first groove are sintered integrally; the second reflux structure and the second groove are sintered integrally; the cross-sectional shape of the first reflux structure is a uniformly distributed or unevenly distributed honeycomb, and the cross-sectional shape of the second reflux structure is an irregular or regular polygon.
4. The improved composite heat pipe according to claim 3, characterized in that: A plurality of groups of air pipes are arranged at equal intervals on the outside of the third groove; the plurality of groups of air pipes form a powder-free air channel for reducing the thermal resistance of the heat pipe, and the width of the powder-free air channel is 0.4-0.5 mm.
5. The improved composite heat pipe according to claim 2, characterized in that: The mesh number of the fine copper powder is 120-150 meshes; the mesh number of the coarse copper powder is 70-80 meshes.
6. The improved composite heat pipe according to claim 1, characterized in that: The first groove is arranged in a spiral structure; the second groove is arranged in a stripe or spiral structure; the third groove is arranged in a stripe or spiral structure.
7. The improved composite heat pipe according to claim 1, characterized in that: A first groove section and a second groove section are provided in the second groove; the first groove section and the second groove section are connected end to end, and the sizes of the first groove section and the second groove section gradually decrease along the fluid flow direction; the size of the first groove is larger than the size of the first groove section; the size of the second groove section is larger than the size of the third groove; Wherein, the groove depth of the second groove section is 0.6 times that of the first groove section.
8. The improved composite heat pipe according to claim 7, characterized in that: The first groove and the third groove are arranged in a polygonal structure; the first groove section is arranged in a triangular structure, and the second groove section is arranged in a rectangular or trapezoidal structure.
9. The improved composite heat pipe according to any one of claims 1 to 8, characterized in that: A graphene composite layer is provided in the condensation zone, and the graphene composite layer is wrapped around the outside of the third groove and has a thickness of 120-150 nm.
10. A method for manufacturing a composite heat pipe, characterized in that: It includes the following steps: a) preparing a tube shell, wherein three grooves are sequentially formed inside the tube shell, namely, a first groove, a second groove and a third groove; b) inserting a stopper rod into the tube shell, wherein the upper and middle sections of the stopper rod are thinner and defined as a thin section, and the lower section of the stopper rod is thicker and defined as a thick section, and the circumference of the thick section is in conflict with the grooves of the tube shell, and the circumference of the thin section is separated from the inner wall of the tube shell by a predetermined distance to form an upper accommodating space and a lower accommodating space; c) throwing coarse copper powder from the top of the tube shell so that the coarse copper powder falls into the lower accommodation space, and then throwing fine copper powder so that the fine copper powder falls into the lower accommodation space; d) Sintering and sealing: Sintering the tube shell so that the coarse copper powder and the fine copper powder inside the tube shell are sintered and fixed to the second groove and the first groove of the tube shell respectively, and then sealing one end of the tube shell, adding an actuating fluid into the tube shell to degas, and then sealing the other end of the tube shell; wherein, the stopper rod is sintered together with the tube shell and then the stopper rod is pulled out.