Low thermal resistance high temperature heat pipe and stirling interface coupling device

Abstract

This invention discloses a low thermal resistance high-temperature heat pipe and Stirling interface coupling device, relating to the field of biomass-Stirling cogeneration technology. The device includes a heat pipe body with a porous solid coating on its inner wall and filled with an alkali metal working fluid. The heat pipe body comprises an evaporation section and a condensation section. The evaporation section is installed in a high-temperature heat exchange chamber of a combustion furnace, and its outer wall is provided with a flow guiding mechanism to increase the contact area with high-temperature flue gas. A connecting mechanism is provided on one side of the flow guiding mechanism. A fixing mechanism is fitted onto the outer wall of the condensation section. Liquid metal thermally conductive paste is filled between the fixing mechanism and the heat pipe body, and between the connecting mechanism and the heat pipe body. This invention can effectively improve heat transfer efficiency and system output power, and improve the operational stability and lifespan of the biomass-Stirling cogeneration system.

Description

Technical Field

[0001] This invention belongs to the field of biomass-Stirling cogeneration technology, specifically relating to a low thermal resistance high temperature heat pipe and Stirling interface coupling device. Background Technology

[0002] Biomass-Stirling cogeneration systems are widely used in distributed energy, industrial waste heat utilization, and energy supply in remote areas. They primarily utilize the clean combustion of biomass energy to achieve efficient conversion of thermal energy into electricity and heat energy, with a continuous and closed-loop operation process. Specifically, renewable fuels such as biomass pellets, straw, and wood chips undergo oxygen-enriched combustion in a dedicated combustion furnace, releasing high-temperature flue gas (450-1000℃) and radiant heat energy, forming a stable high-temperature heat source. To avoid damage to the Stirling engine from flue gas corrosion and ash accumulation, the system uses high-temperature heat pipes as intermediate heat transfer media, placing the heat pipe evaporation section in the high-temperature environment generated by biomass combustion to absorb heat. The heat causes the alkali metal working fluid inside the heat pipe to undergo a phase change and evaporate. The high-temperature steam flows rapidly to the condensation section of the heat pipe, and then transfers the heat to the hot end heater of the Stirling engine through a specific interface coupling method. As an external combustion closed-cycle device, the Stirling engine is sealed with inert working fluids such as helium and hydrogen. The hot end heater continuously receives the heat transferred from the heat pipe, causing the working fluid inside the cavity to expand and increase in pressure, which drives the piston to move and convert thermal energy into mechanical rotational kinetic energy, thereby driving the generator to generate electricity. At the same time, the heat dissipation of the engine cold end, the exhaust heat, and the heat dissipation of the system surface can be recovered through the heat exchanger to produce hot water or hot air for heating, drying and other purposes, realizing cogeneration and greatly improving the comprehensive energy utilization rate. However, in actual engineering, the metal surfaces of the heat pipe condenser section and the Stirling engine heater have a large number of voids due to microscopic irregularities, and the air has an extremely low thermal conductivity, approximately... During heat transfer, a significant temperature drop occurs. For example, in the KRUSTY test (thousand-power reactor test), when the bolt clamp coupling method is used, the temperature difference between the heat pipe condensation section and the Stirling hot end interface is as high as 120°C, which is far beyond the reasonable temperature difference under normal operating conditions. Moreover, the temperature difference fluctuates greatly with the operating conditions, which means that the heat absorbed by the heat pipe from biomass combustion cannot be efficiently transferred to the Stirling hot end, resulting in serious heat loss and affecting the temperature stability of the Stirling engine hot end. Summary of the Invention

[0003] The purpose of this invention is to provide a low thermal resistance high temperature heat pipe and Stirling interface coupling device, which can effectively improve heat transfer efficiency and system output power, and improve the operational stability and lifespan of biomass-Stirling cogeneration system, thereby solving the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A low thermal resistance high temperature heat pipe and Stirling interface coupling device includes a heat pipe body, the inner wall of the heat pipe body is provided with a porous solid coating, and the interior of the heat pipe body is filled with an alkali metal working material. The heat pipe body includes an evaporation section and a condensation section. The evaporation section is used to be installed in the high-temperature heat exchange chamber of the combustion furnace. The outer wall of the evaporation section is provided with a flow guiding mechanism to increase the contact area with the high-temperature flue gas. A connecting mechanism is provided on one side of the flow guiding mechanism to connect and fix the heat pipe body to the side wall of the combustion furnace. The outer wall of the condensation section is fitted with a fixing mechanism for installing the heat pipe body on the heating end of the Stirling generator hot end heater. Liquid metal thermal grease is filled between the fixing mechanism and the heat pipe body, as well as between the connecting mechanism and the heat pipe body.

[0005] Preferably, the alkali metal working material is sodium or potassium metal, and the filling amount of the alkali metal working material is 30%-50% of the total internal volume of the heat pipe body.

[0006] Preferably, the porous solid coating has a thickness of 0.5-1.5 mm, and the porous solid coating is made by uniformly coating copper-based powder or nickel-based powder onto the inner wall of the heat pipe body through a vacuum sintering process.

[0007] Preferably, the sidewall of the condensing section is inclined, and the diameter of the condensing section is larger than the diameter of the evaporating section. The end of the condensing section that contacts the heating end and the end of the evaporating section located in the high-temperature heat exchange chamber of the combustion furnace are both arc-shaped.

[0008] Preferably, the flow guiding mechanism includes a spiral protrusion and a plurality of arc-shaped protrusions. The spiral protrusion is located on the outer wall of the evaporation section, and the plurality of arc-shaped protrusions are distributed in a triangular array on the arc-shaped surface of the evaporation section.

[0009] Preferably, the connecting mechanism includes a connecting plate sleeved on the outer wall of the heat pipe body, a collar fixed on one side of the connecting plate, a first filling gap for liquid metal thermal grease to be filled between the collar and the heat pipe body, a sealing plate embedded on the other side of the connecting plate, and multiple positioning posts fixed on the connecting plate located on the outer periphery of the sealing plate.

[0010] Preferably, the fixing mechanism includes a sleeve fitted around the outside of the heat pipe body, a hoop with an opening fixed on one side of the sleeve, the hoop fitted around the outside of the heating end, and flanges fixed on the outer walls of the opening on both sides of the hoop, the flanges on both sides being connected by connecting bolts.

[0011] Preferably, a second filling gap is left between the heat pipe body and the heating end for filling with liquid metal thermal paste. The second filling gap is located inside the hoop, and the depth of the second filling gap is greater than the width of the hoop.

[0012] Preferably, the heat pipe body further includes a transition section located between the evaporation section and the condensation section, and the connecting mechanism is located at the connection between the transition section and the evaporation section, the fixing mechanism is located at the connection between the condensation section and the evaporation section, the diameter of the transition section is the same as the diameter of the evaporation section, and the outer wall of the transition section is fitted with heat insulation cotton.

[0013] Preferably, the insulation cotton is one of ceramic fiber blanket, nano aerogel insulation felt and composite silicate high temperature insulation felt. The insulation cotton is tightly wrapped around the outer wall of the heat pipe body by spiral winding or whole-section wrapping, and then locked and fixed by high temperature resistant stainless steel binding straps.

[0014] The low thermal resistance high temperature heat pipe and Stirling interface coupling device proposed in this invention has the following advantages compared with the prior art: 1. This invention fills the space between the fixing mechanism and the heat pipe body and between the connecting mechanism and the heat pipe body with liquid metal thermal grease, fills the microscopic gaps in the metal contact surface, eliminates the air insulation layer, and transfers the heat of the condensing section to the Stirling hot end heater without significant loss. This greatly reduces the interfacial contact thermal resistance, eliminates the problem of large temperature difference, effectively improves the heat transfer efficiency and system output power, and improves the operational stability and lifespan of the biomass-Stirling cogeneration system. 2. This invention utilizes a porous solid coating inside the heat pipe body in combination with an alkali metal working material to form a stable capillary wick structure, ensuring the heat pipe body itself has low thermal resistance and high heat transfer capacity, making it suitable for the high-temperature environment of the biomass-Stirling system. 3. This invention increases the contact area of ​​high-temperature flue gas by setting a flow guiding mechanism in the evaporation section, thereby improving the heat absorption efficiency; the connecting mechanism and the fixing mechanism enable reliable installation of the heat pipe, the combustion furnace, and the Stirling hot end, thereby improving the convenience of heat pipe body installation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the exploded structure of the present invention; Figure 3 This is a cross-sectional structural diagram of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 For the present invention Figure 3 Enlarged structural diagram at point B; Figure 6 This is a schematic diagram of the connection mechanism structure of the present invention; Figure 7 This is a schematic diagram of the fixing mechanism of the present invention.

[0016] In the diagram: 1. Heat pipe body; 11. Evaporation section; 111. Spiral protrusion; 12. Transition section; 13. Condensation section; 2. Connecting mechanism; 21. Connecting plate; 22. Mounting groove; 23. Collar; 24. Positioning post; 3. Sealing plate; 4. Insulation cotton; 5. Fixing mechanism; 51. Sleeve; 52. Hoop; 53. Folded edge; 54. Connecting bolt; 6. Heating end; 7. Embedded groove; 8. Porous solid coating; 9. First filling gap; 10. Second filling gap. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The specific embodiments described herein are merely used to explain the present invention and are not intended to limit 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.

[0018] This invention provides, for example Figure 1-7 The low thermal resistance high-temperature heat pipe and Stirling interface coupling device shown includes a heat pipe body 1. The inner wall of the heat pipe body 1 is provided with a porous solid coating 8, forming a stable capillary wick structure. This solves the problems of poor reflux of the alkali metal working fluid and low high-temperature heat transfer efficiency, ensuring the heat pipe itself has low thermal resistance and high heat transfer capacity. The interior of the heat pipe body 1 is filled with an alkali metal working fluid material, suitable for high-temperature biomass heat sources of 450-1000℃, avoiding high-temperature failure of conventional working fluids and achieving efficient phase change transfer of high-temperature heat. The heat pipe body 1 includes an evaporation section 11 and a condensation section 13. The evaporation section 11 is used to install in the high-temperature heat exchange chamber of the combustion furnace. The outer wall is provided with a flow guiding mechanism to increase the contact area with high-temperature flue gas and improve heat absorption efficiency. A connecting mechanism 2 is provided on one side of the flow guiding mechanism to connect and fix the heat pipe body 1 to the side wall of the combustion furnace, so as to realize the reliable installation of the heat pipe, the combustion furnace and the Stirling hot end. The outer wall of the condensing section 13 is fitted with a fixing mechanism 5 to install the heat pipe body 1 on the heating end 6 of the Stirling generator hot end heater. Liquid metal thermal conductive paste is filled between the fixing mechanism 5 and the heat pipe body 1 and between the connecting mechanism 2 and the heat pipe body 1 to fill the micro-pores on the metal surface, replace the low thermal conductivity air, significantly reduce the interface contact thermal resistance and eliminate the problem of large temperature difference.

[0019] In operation, the evaporation section 11 is placed in the high-temperature heat exchange chamber of the combustion furnace. The flow guiding mechanism increases the contact area with the high-temperature flue gas, rapidly absorbing the 450-1000℃ heat generated by biomass combustion. The heat is transferred through the pipe wall to the porous solid coating 8 on the inner wall. The coating drives the internal alkali metal working fluid to absorb heat and undergo phase change evaporation, forming high-temperature steam. The high-temperature steam flows rapidly along the inner cavity of the heat pipe to the condensation section 13, where it releases heat. The condensation section 13 is tightly fitted to the Stirling generator hot-end heater through the fixing mechanism 5. The gaps between the connecting mechanism 2, the fixing mechanism 5 and the heat pipe body 1, as well as the gap between the heat pipe and the heating end 6, are all filled with liquid metal thermal conductive paste, filling the microscopic gaps on the metal contact surface, eliminating the air insulation layer, and transferring the heat from the condensation section 13 to the Stirling hot-end heater without significant loss. The released alkali metal working fluid flows back to the evaporation section 11 under the capillary action of the porous solid coating 8, completing the cycle and continuously achieving low thermal resistance and high efficiency transfer of high-temperature heat from the combustion furnace to the Stirling engine.

[0020] In this embodiment, the alkali metal working material is set as sodium or potassium metal. The filling amount of the alkali metal working material is 30%-50% of the total internal volume of the heat pipe body 1. Sodium and potassium metals have high boiling points and stable high-temperature phase change heat transfer performance, and are suitable for working temperatures of 450-1000℃. The filling amount of 30%-50% ensures that the working material is sufficient to complete the heat absorption evaporation and heat release condensation cycle, while reserving space for steam flow. This avoids the problem of excessive working material causing obstruction of steam flow and insufficient working material causing insufficient heat transfer capacity. It ensures stable phase change heat transfer of the heat pipe under high-temperature conditions, avoids heat transfer failure caused by overflow or insufficient working material, and optimizes the heat transfer efficiency and working stability of the heat pipe.

[0021] In this embodiment, the porous solid coating 8 has a thickness of 0.5-1.5 mm. The porous solid coating 8 is made by uniformly coating copper-based powder or nickel-based powder onto the inner wall of the heat pipe body 1 through a vacuum sintering process. This thickness takes into account both capillary force and heat transfer efficiency. Vacuum sintering makes the coating tightly bonded to the pipe wall and the pores uniform, forming a stable capillary core structure to provide a stable capillary driving force, ensuring that the alkali metal working fluid quickly flows back to the evaporation section 11 after heat release, thereby improving the heat transfer rate of the heat pipe. The copper-based or nickel-based powder is resistant to high temperature, which extends the service life of the coating and is suitable for long-term high-temperature working environment.

[0022] Specifically, such as Figure 3 As shown, the sidewall of the condensing section 13 is inclined, and the diameter of the condensing section 13 is larger than the diameter of the evaporating section 11, which increases the condensing area and heat release space, improves the heat release efficiency of the condensing section 13, and optimizes the flow of high-temperature flue gas. The end of the condensing section 13 that contacts the heating end 6 and the end of the evaporating section 11 located in the high-temperature heat exchange chamber of the combustion furnace are both arc-shaped, which reduces the flow resistance of flue gas, reduces the stress concentration of the metal contact surface during installation, improves the interface fit, and further reduces the contact thermal resistance.

[0023] Preferably, the flow guiding mechanism includes a spiral protrusion 111 and several arc-shaped protrusions. The spiral protrusion 111 is located on the outer wall of the evaporation section 11, and the several arc-shaped protrusions are distributed in a triangular array on the arc-shaped surface of the evaporation section 11. The cross-section of the spiral protrusion 111 is semi-circular, which is used to guide the flue gas to flow along the heat pipe axis. The arc-shaped protrusions increase the flue gas disturbance and contact area, enhance convective heat transfer, improve the efficiency of the evaporation section 11 in absorbing heat from high-temperature flue gas, enable the heat pipe to absorb heat quickly and transfer heat at full load, and improve the overall system response speed.

[0024] Furthermore, such as Figure 6 As shown, the connecting mechanism 2 includes a connecting plate 21 sleeved on the outer wall of the heat pipe body 1. A collar 23 is fixed on one side of the connecting plate 21. A first filling gap 9 for liquid metal thermal grease to be filled is left between the collar 23 and the heat pipe body 1. A sealing plate 3 is embedded on the other side of the connecting plate 21. An installation groove 22 for installing the sealing plate 3 is opened on the connecting plate 21. An embedding groove 7 for embedding the sealing plate 3 is provided on the outer wall of the heat pipe body 1. Multiple positioning posts 24 are fixed on the connecting plate 21 located on the outer periphery of the sealing plate 3. Positioning holes matching the positioning posts 24 are provided on the side wall of the combustion furnace to improve the accuracy of the connection between the connecting plate 21 and the combustion furnace, realize the firm installation of the heat pipe and the side wall of the combustion furnace. The thermal grease in the first filling gap 9 eliminates the interface thermal resistance between the collar 23 and the heat pipe. The sealing plate 3 prevents high-temperature flue gas leakage and ensures the airtightness of the heat exchange cavity.

[0025] In this embodiment, as Figure 7 As shown, the fixing mechanism 5 includes a sleeve 51 that is fitted onto the outside of the heat pipe body 1. A hoop 52 with an opening is fixed on one side of the sleeve 51. The hoop 52 is fitted onto the outside of the heating end 6. The heating end 6 is provided with a slot that matches the condensing section 13, so as to facilitate the connection between the condensing section 13 and the heating end 6. Folded edges 53 are fixed on the outer walls on both sides of the opening of the hoop 52. The two sides of the folded edges 53 are connected by connecting bolts 54. By tightening the folded edges 53 with bolts, the hoop 52 and the heating end 6 are tightly fitted, so as to achieve detachable and high-fit installation of the heat pipe and the Stirling hot end. The installation is convenient and the fixing is firm, ensuring long-term stable fit of the interface.

[0026] Furthermore, such as Figure 5 As shown, a second filling gap 10 is left between the heat pipe body 1 and the heating end 6 for filling with liquid metal thermal conductive paste. The second filling gap 10 is located inside the hoop 52, and the depth of the second filling gap 10 is greater than the width of the hoop 52. It completely fills the microscopic gap between the heat pipe and the heating end 6 of the Stirling engine heater, completely eliminates the air insulation layer, realizes zero-gap low thermal resistance coupling at the interface, and achieves lossless heat transfer.

[0027] To address the issue of heat loss in the heat pipe body 1 caused by excessive spacing between the combustion furnace and the heating end 6 of the Stirling engine heater, the heat pipe body 1 of this invention further includes a transition section 12. The transition section 12 is located between the evaporation section 11 and the condensation section 13, and the connecting mechanism 2 is located at the connection between the transition section 12 and the evaporation section 11. The fixing mechanism 5 is located at the connection between the condensation section 13 and the evaporation section 11. The diameter of the transition section 12 is the same as the diameter of the evaporation section 11. The outer wall of the transition section 12 is fitted with insulation cotton 4. The transition section 12 reduces the thermal stress caused by the sudden change in pipe diameter, and the insulation cotton 4 prevents heat loss during transmission, further reducing the overall heat loss of the heat pipe. The mechanism layout is reasonable, installation is convenient, and the structure is compact.

[0028] Specifically, the insulation cotton 4 is one of ceramic fiber blanket, nano aerogel insulation felt, and composite silicate high-temperature insulation felt. The insulation cotton 4 is tightly wrapped around the outer wall of the heat pipe body 1 by spiral winding or whole-section wrapping, and then locked and fixed by high-temperature resistant stainless steel binding straps. It is suitable for high-temperature working conditions, has excellent heat preservation effect, and effectively prevents heat loss from the heat pipe transition section 12. The binding straps are firmly fixed to prevent the insulation layer from falling off and ensure long-term stable heat preservation.

[0029] During operation, biomass fuel is fully combusted in the combustion furnace, generating high-temperature flue gas at 450-800℃. The flue gas comes into contact with the spiral protrusions 111 and arc-shaped protrusions of the evaporation section 11, and the heat is rapidly absorbed. The heat is transferred through the pipe wall to the porous solid coating 8, driving the sodium working fluid to absorb heat and evaporate into high-temperature steam. The steam flows rapidly along the inner cavity to the condensation section 13, where it releases heat. The heat from the condensation section 13 is transferred to the heating end 6 of the Stirling engine heater without significant loss through the liquid metal thermal conductive paste in the second filling gap 10, driving the working fluid inside the Stirling engine to expand and generate electricity. The sodium working fluid, after releasing heat, flows back to the evaporation section 11 under the capillary force of the porous solid coating 8, and continues to circulate. The first filling gap 9 of the connecting mechanism 2 and the second filling gap 10 of the fixing mechanism 5 are kept filled with liquid metal thermal conductive paste throughout the process, and the interface temperature difference is controlled within 15℃, which is much lower than the 120℃ of the traditional bolt clamping method, achieving low thermal resistance and high-efficiency heat transfer.

[0030] It should be noted that the liquid metal thermal paste uses a gallium indium tin alloy high-temperature thermal paste with a thermal conductivity of [missing information]. It is suitable for long-term operation below 600℃; the porous solid coating is vacuum sintered at 900℃ and kept for 2 hours to ensure that the coating bonding strength and porosity meet the standards; after being wrapped with insulation cotton, the surface temperature is below 80℃, the heat loss rate is less than 3%, the overall heat transfer efficiency of the device is more than 60% higher than that of the traditional structure, and the temperature fluctuation of the hot end of the Stirling engine is less than ±5℃.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low thermal resistance high temperature heat pipe and Stirling interface coupling device, characterized in that: It includes a heat pipe body (1), the inner wall of which is provided with a porous solid coating (8), and the interior of the heat pipe body (1) is filled with an alkali metal working material; The heat pipe body (1) includes an evaporation section (11) and a condensation section (13). The evaporation section (11) is used to be installed in the high-temperature heat exchange chamber of the combustion furnace. The outer wall of the evaporation section (11) is provided with a flow guiding mechanism to increase the contact area with the high-temperature flue gas. A connecting mechanism (2) is provided on one side of the flow guiding mechanism to connect and fix the heat pipe body (1) to the side wall of the combustion furnace. The outer wall of the condensation section (13) is fitted with a fixing mechanism (5) for installing the heat pipe body (1) on the heating end (6) of the Stirling generator hot end heater. Liquid metal thermal grease is filled between the fixing mechanism (5) and the heat pipe body (1) and between the connecting mechanism (2) and the heat pipe body (1).

2. The low thermal resistance high temperature heat pipe and Stirling interface coupling device according to claim 1, characterized in that: The alkali metal working material is set as sodium or potassium metal material, and the filling amount of the alkali metal working material is 30%-50% of the total internal volume of the heat pipe body (1).

3. The low thermal resistance high temperature heat pipe and Stirling interface coupling device according to claim 1, characterized in that: The porous solid coating (8) has a thickness of 0.5-1.5 mm. The porous solid coating (8) is made by uniformly coating the inner wall of the heat pipe body (1) with copper-based powder or nickel-based powder through a vacuum sintering process.

4. The low thermal resistance high temperature heat pipe and Stirling interface coupling device according to claim 1, characterized in that: The sidewall of the condensing section (13) is inclined, and the diameter of the condensing section (13) is larger than the diameter of the evaporating section (11). The end of the condensing section (13) that contacts the heating end (6) and the end of the evaporating section (11) located in the high-temperature heat exchange chamber of the combustion furnace are both arc-shaped.

5. The low thermal resistance high temperature heat pipe and Stirling interface coupling device according to claim 4, characterized in that: The flow guiding mechanism includes a spiral protrusion (111) and several arc-shaped protrusions. The spiral protrusion (111) is located on the outer wall of the evaporation section (11), and the several arc-shaped protrusions are distributed in a triangular array on the arc surface of the evaporation section (11).

6. The low thermal resistance high temperature heat pipe and Stirling interface coupling device according to claim 5, characterized in that: The connecting mechanism (2) includes a connecting plate (21) sleeved on the outer wall of the heat pipe body (1). A collar (23) is fixed on one side of the connecting plate (21). A first filling gap (9) for liquid metal thermal paste to be filled is left between the collar (23) and the heat pipe body (1). A sealing plate (3) is embedded on the other side of the connecting plate (21). Multiple positioning posts (24) are fixed on the connecting plate (21) located on the outer periphery of the sealing plate (3).

7. The low thermal resistance high temperature heat pipe and Stirling interface coupling device according to claim 6, characterized in that: The fixing mechanism (5) includes a sleeve (51) fitted outside the heat pipe body (1). A hoop (52) with an opening is fixed on one side of the sleeve (51). The hoop (52) is fitted outside the heating end (6). Flanged edges (53) are fixed on the outer walls of the opening on both sides of the hoop (52). The two folded edges (53) are connected by connecting bolts (54).

8. The low thermal resistance high temperature heat pipe and Stirling interface coupling device according to claim 1, characterized in that: A second filling gap (10) is left between the heat pipe body (1) and the heating end (6) for filling liquid metal thermal paste. The second filling gap (10) is located inside the hoop (52), and the depth of the second filling gap (10) is greater than the width of the hoop (52).

9. The low thermal resistance high temperature heat pipe and Stirling interface coupling device according to claim 1, characterized in that: The heat pipe body (1) also includes a transition section (12), which is located between the evaporation section (11) and the condensation section (13). The connecting mechanism (2) is located at the connection between the transition section (12) and the evaporation section (11), and the fixing mechanism (5) is located at the connection between the condensation section (13) and the evaporation section (11). The diameter of the transition section (12) is the same as the diameter of the evaporation section (11), and the outer wall of the transition section (12) is fitted with insulation cotton (4).

10. The low thermal resistance high temperature heat pipe and Stirling interface coupling device according to claim 9, characterized in that: The insulation cotton (4) is one of ceramic fiber blanket, nano aerogel insulation felt and composite silicate high temperature insulation felt. The insulation cotton (4) is tightly wrapped around the outer wall of the heat pipe body (1) by spiral winding or whole-section wrapping, and then locked and fixed by high temperature resistant stainless steel binding straps.

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