Rotary gravity assisted heat pipe capable of being self-assembled and radiator

Abstract

The invention discloses a self-assembled rotary gravity heat pipe and a radiator. The rotary gravity heat pipe comprises an evaporation section, a heat insulation section and a condensation section which are detachably connected in sequence. Threaded structures are arranged on the inner wall of the evaporation section and the inner wall of the condensation section; a plurality of fin assemblies are arranged on the outer wall of the condensation section and are of hollow structures, and the hollow structures of the fin assemblies communicate with the condensation section; the included angle between the gravity assisted heat pipe and the horizontal direction can be adjusted within the range of 30-90 degrees. According to the rotary gravity heat pipe, the heat exchange efficiency is remarkably improved by optimizing the modification structures of the inner wall and the outer wall and adopting the detachable connection design and the reasonable inclined mounting angle.

Description

Technical Field

[0001] The invention belongs to the technical field of heat exchange performance structure synergistically enhanced heat exchange of a gravity heat pipe, and relates to a self-assembled rotating gravity heat pipe and a radiator. Background Art

[0002] As a high-efficiency heat transfer element based on the principle of gas-liquid phase change, heat pipes are widely used in various fields such as electronic heat dissipation and waste heat recovery due to their small size, strong heat transfer capacity, good temperature uniformity, and compact structure. With the rapid development of human industry (including manufacturing, construction, production and supply of electricity, gas and water), the requirements for energy conservation and environmental protection are constantly increasing. As one of the most effective heat exchange elements, how to improve the heat exchange efficiency of gravity heat pipes has become the most critical issue. Rotating heat pipes use rotating centrifugal force as the driving force to drive the working medium to flow back from the condensing section to the evaporating section liquid pool. According to the position of the axis of the rotating heat pipe and the rotating axis, the heat pipe can be divided into an axial rotating heat pipe whose axis coincides with the rotating axis, a radial rotating heat pipe whose axis is perpendicular to the rotating axis, and a rotating heat pipe whose axis intersects but is not perpendicular to the rotating axis.

[0003] Nowadays, the main methods for enhancing heat transfer in gravity heat pipes include surface treatment, setting inner tubes, and using high-efficiency heat exchange media. The purpose of setting inner tubes, ties, and fins is to increase the disturbance of the fluid in the heat pipe to enhance heat transfer. The method of using high-efficiency heat exchange media such as nanofluids is to use the high-efficiency thermal conductivity of the media to achieve rapid heat transfer. The surface treatment method is to change the structure and properties of the heat exchange wall surface in the tube to increase the heat exchange area of ​​the wall surface and increase the nucleation points of the wall surface. This method has low cost and high effectiveness, but the current surface structure improvement is single and cannot effectively achieve efficient heat exchange. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a self-assembled rotating gravity heat pipe and a radiator, thereby solving the technical problem of low heat exchange efficiency of the gravity heat pipe in the prior art.

[0005] The present invention is achieved through the following technical solutions: A self-assembled rotating gravity heat pipe, comprising an evaporation section, an insulation section and a condensation section which are detachably connected in sequence; The inner wall of the evaporation section and the inner wall of the condensation section are both provided with a thread structure; The outer wall of the condensing section is provided with a plurality of fin assemblies, and the plurality of fin assemblies are hollow structures, and the hollow structures of the fin assemblies are connected to the condensing section; The angle between the gravity heat pipe and the horizontal direction can be adjusted within the range of 30 to 90 degrees.

[0006] Preferably, the thread structure has a width of 1-5 mm and a pitch of 1-5 mm.

[0007] Preferably, the angle between the fin assembly and the outer wall of the condensation section is 30-60°.

[0008] Preferably, the angle between the fin assembly and the outer wall of the condensation section is 45°.

[0009] Preferably, the ratio of the diameter of the condensing section to the width of the fin assembly is (0.6~3):1, the ratio of the diameter of the condensing section to the thickness of the fin assembly is (1.5~6):1, and the ratio of the diameter of the condensing section to the length of the fin assembly is (0.3~1):1.

[0010] Preferably, a liquid wick is provided inside the fin assembly.

[0011] Preferably, the liquid wick is at least one of a metal mesh, graphite felt or ceramic fiber.

[0012] Preferably, the inner wall of the condensation section is provided with a groove, one end of the liquid absorbent core is embedded in the groove, and the other end is extended along the hollow inner cavity of the condensation section.

[0013] Preferably, the ratio of the length of the evaporation section to the length of the condensation section is 1:(1~2).

[0014] A radiator comprises the gravity heat pipe mentioned above.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention discloses a self-assembled rotating gravity heat pipe, wherein the inner walls of the evaporation section and the condensation section both adopt a threaded structure, which can significantly increase the surface area of ​​the inner wall of the heat pipe. During the heat exchange process, a larger surface area means that more heat can be transferred in the same time, thereby improving the heat exchange efficiency. The threaded structure can also generate eddy and turbulent effects when the fluid (such as the working medium) flows, and these effects help to break the thermal boundary layer, reduce thermal resistance, and transfer heat to other parts of the heat pipe more quickly; a fin assembly is arranged on the outer wall of the condensation section, and some of the fin assemblies are hollow structures, and the hollow structures of the fin assemblies are connected to the condensation section. This structure also increases the contact area between the heat pipe and the external environment. During the condensation process, more heat can be dissipated into the surrounding environment through these fins, thereby improving the condensation efficiency, especially in the case of natural wind or forced convection. In the case of a fin assembly, air flow will take away more heat, further enhancing the heat exchange effect; the evaporation section and the condensation section are detachably connected, which is easy to maintain and replace. When scale or damage occurs inside the heat pipe or a separate section needs to be replaced to adapt to different scenarios, the corresponding part can be removed and cleaned or replaced separately without replacing the entire heat pipe, which helps to maintain the efficient operation of the heat pipe; the angle between the gravity heat pipe and the horizontal direction is adjustable within the range of 30~90°. This inclined installation facilitates the natural circulation of the working fluid in the heat pipe. In the evaporation section, the working fluid evaporates and rises due to heat. In the condensation section, the steam condenses when it encounters cold and flows back to the evaporation section along the wall, forming a continuous cycle. The inclined installation ensures that the working fluid flows smoothly under the action of gravity, and can be applied to different industrial scenarios such as inclined radiators or places away from heat sources, thereby improving the heat exchange efficiency. In summary, the rotating gravity heat pipe has a detachable structure, a threaded structure on the inner walls of the evaporation section and the condensation section, and a plurality of fin assemblies connected to the condensation section on the outer wall of the condensation section. Through the coordination of different modified structures and combined with appropriate rotation angle settings, the heat exchange efficiency and ease of use are significantly improved.

[0016] Furthermore, another inventive point of the present invention is that the width of the thread structure is 1-5 mm, and the pitch is 1-5 mm. Within a given length, the thread structure effectively increases the surface area of ​​the inner wall of the heat pipe through its spiral shape. This increase in surface area provides more contact points for heat transfer, so that heat can be transferred from the heat source to the working fluid more quickly, and then from the working fluid to the condensation section, thereby improving the overall heat exchange efficiency. When the width and pitch of the thread structure are moderate, a moderate turbulence effect can be generated during the flow of the fluid (working fluid). Turbulence helps to destroy the thermal boundary layer, reduce thermal resistance, and make heat transfer more efficient. However, if the pitch is too large or too small, it may cause insufficient or excessive turbulence effect, thereby affecting the heat exchange efficiency. Therefore, a pitch of 1-5 mm is a relatively optimized choice. Moderate thread width and pitch also help to promote mixing of fluids in the heat pipe. In the evaporation section, this helps the working fluid to be heated evenly and evaporate quickly; in the condensation section, it helps the steam to fully contact the condensation wall surface and condense quickly. The enhancement of fluid mixing further improves the heat exchange efficiency. Although the thread structure will increase the resistance of fluid flow, this resistance increase is controllable within a reasonable width and pitch range. Appropriate thread design can minimize the pressure drop of fluid flow while ensuring heat exchange efficiency, thereby maintaining smooth circulation of the working fluid in the heat pipe.

[0017] Furthermore, another inventive point of the present invention is that the angle between the fin assembly and the outer wall of the condensation section is 30-60°. When the angle between the fin and the outer wall of the condensation section is within this range, the surrounding air flow can be effectively guided. When the air flows through the fin, due to the inclination angle of the fin, the air will be guided to a certain extent, forming eddies or turbulence, thereby increasing the contact time and contact area between the air and the fin surface. This enhanced air flow helps to transfer heat from the fin to the surrounding environment faster, thereby improving the condensation efficiency. The inclined fin assembly allows the heat to be transferred along a longer path during the transfer process, thereby increasing the heat transfer time. At the same time, due to the moderate angle between the fin and the outer wall of the condensation section, the heat can be more evenly distributed on the fin surface, reducing the formation of local hot spots and cold spots, and further improving the heat transfer efficiency. The existence of the fin assembly itself can reduce thermal resistance, because the fin increases the contact area between the condensation section and the air, making it easier for heat to be transferred from the condensation section to the air. The inclined fin assembly can further optimize this effect, reducing thermal resistance by guiding air flow and increasing the heat transfer path. The inclined fin assembly also occupies a certain space in the vertical direction, thereby increasing the overall heat dissipation area of ​​the condensation section. A larger heat dissipation area means that more heat can be dissipated to the surrounding environment in the same time, thereby improving the heat dissipation capacity of the condensation section. Furthermore, another inventive point of the present invention is that the angle between the fin assembly and the outer wall of the condensation section is 45°, which has the functions of maximizing air flow efficiency, evenly distributing heat, optimizing the heat transfer path and reducing thermal resistance. These effects work together to enable the rotating gravity heat pipe to dissipate heat to the surrounding environment more effectively during the condensation process, thereby improving the overall heat exchange efficiency.

[0018] Furthermore, another inventive point of the present invention is that the ratio of the diameter of the condensing section to the width of the fin assembly is (0.6~3):1, the ratio of the diameter of the condensing section to the thickness of the fin assembly is (1.5~6):1, and the ratio of the diameter of the condensing section to the length of the fin assembly is (0.3~1):1. The fin is a hollow structure and is connected to the condensing section. In another preferred embodiment, the wall thickness of the fin assembly ranges from 1 to 5 mm, so that the fins can occupy an appropriate space on the outer wall of the condensing section, neither too dense to hinder air flow nor too sparse to waste space. Such a width design helps to maximize the contact area between the fins and the air, thereby improving the heat exchange efficiency; the ratio of the diameter of the condensing section to the length of the fin assembly is (0.3~1):1, which ensures that the fins have enough length to guide the air flow and form effective heat exchange on their surface. Longer fins can increase the heat transfer path, so that heat has more opportunities to exchange with the air; the ratio of the diameter of the condensing section to the thickness of the fin assembly is (1.5~6):1, while ensuring structural strength, it also provides sufficient heat transfer area. Thicker fins can more effectively transfer heat from the condensing section to the fin surface and then to the air. In addition, the appropriate thickness can also help reduce thermal resistance and improve heat transfer efficiency. The comprehensive design of width, thickness and length makes the fin assembly more compact and efficient as a whole. This design helps to achieve the maximum heat exchange effect in a limited space. Appropriate thickness design not only helps to enhance the heat transfer effect, but also improves the stability of the fin assembly. Thicker fins can better resist the influence of external factors such as wind pressure and vibration, and maintain the overall stability of the heat pipe.

[0019] Furthermore, another inventive point of the present invention is that a liquid wick is provided inside the fin assembly. One of the main functions of the liquid wick is to provide a strong capillary force, which helps the working medium (such as liquid) to circulate inside the heat pipe. The liquid wick is provided on the inner wall surface of the hollow structure inside the fin, which can ensure that the working medium can flow back from the condensation section to the evaporation section more effectively, and can maintain continuous flow even in tiny channels or pores. This enhanced capillary action helps to maintain the stable circulation of the working medium inside the heat pipe, thereby improving the heat exchange efficiency. The liquid wick usually has a large surface area, which increases the contact area between the working medium and the inner wall of the heat pipe. The liquid wick is provided on the inner wall surface of the hollow structure inside the fin, which can further increase this contact area, so that heat can be transferred from the heat source to the working medium more quickly, and from the working medium to the condensation section. This enhanced heat transfer efficiency helps to reduce thermal resistance and improve the overall heat exchange performance. In the condensation section, the liquid wick can quickly absorb steam and promote its condensation, which helps to speed up the working cycle inside the heat pipe, thereby improving the heat exchange efficiency. The presence of the liquid absorption core helps to reduce bubbles and drying inside the heat pipe, which will cause the performance of the heat pipe to deteriorate or even fail. By setting the liquid absorption core on the inner wall surface of the hollow structure inside the fin, it can ensure that the working fluid is evenly distributed and continuously circulated inside the heat pipe, thereby improving the reliability and service life of the heat pipe.

[0020] Furthermore, another inventive point of the present invention is that the liquid wick is at least one of a metal mesh, graphite felt or ceramic fiber. The metal mesh, graphite felt and ceramic fiber all have good capillary properties and can effectively absorb and retain the working fluid. This property ensures that the working fluid can circulate smoothly inside the heat pipe, especially in the process of the working fluid refluxing from the evaporation section to the condensation section, the capillary force of the liquid wick plays a key role. As a metal material, the metal mesh has excellent thermal conductivity. It can quickly transfer heat from the evaporation section to the condensation section, reduce thermal resistance, and improve the overall heat exchange efficiency. Although graphite felt is not as good as metal in thermal conductivity, its high thermal conductivity and good thermal stability also make it perform well in high temperature environments. Although ceramic fiber has relatively low thermal conductivity, its high temperature resistance and corrosion resistance make it a preferred material under specific working conditions. Metal mesh, graphite felt and ceramic fiber all have good chemical stability and mechanical strength, can resist corrosion and wear, thereby extending the service life of the heat pipe. They can also reduce bubbles and dryness inside the heat pipe, maintain stable circulation of the working fluid, and improve the reliability and stability of the heat pipe.

[0021] Furthermore, another inventive point of the present invention is that the inner wall of the condensation section is provided with a groove, and the wick is embedded in the groove. The design of the groove provides a more stable and concentrated environment for the wick, which helps to further enhance its capillary action. The wick can better maintain its shape and position in the groove, ensuring that the working medium circulates smoothly between the evaporation section and the condensation section, reducing the performance degradation caused by poor flow; in addition, the groove may also form a tiny vortex or turbulence, which helps to break the thermal boundary layer and further improve the heat exchange performance. The design of the groove helps to optimize the distribution of the working medium inside the heat pipe. The positioning of the wick in the groove enables the working medium to be more evenly distributed inside the heat pipe, reducing the occurrence of local overheating or overcooling. This uniform distribution of the working medium helps to improve the stability and reliability of the heat pipe. The combined use of the groove and the wick helps to reduce the thermal resistance inside the heat pipe. The design of the groove may make the heat transfer path more direct and efficient, and the wick can quickly transfer heat from the evaporation section to the condensation section. This design reduces the loss of heat during the transfer process and improves the overall heat exchange efficiency. The groove design may also strengthen the fin assembly and improve its mechanical strength and stability. Especially under harsh working conditions such as high temperature and high pressure, the combination of the groove and the wick can help reduce the deformation and damage of the fin and extend the service life of the heat pipe.

[0022] Furthermore, another inventive point of the present invention is that the ratio of the length of the evaporation section to the condensation section is 1: (1-2). The length ratio design of the evaporation section to the condensation section ensures the rationality of the heat transfer path. The shorter evaporation section can quickly transfer heat to the working fluid, causing it to evaporate and rise to the condensation section. The relatively long condensation section provides sufficient space and time for steam to condense and release heat. This design helps to achieve efficient heat transfer and conversion. Since the condensation section is relatively long, the steam has a longer path in the condensation section for condensation, thereby increasing the contact time and contact area with the condensation wall surface, which helps to make fuller use of the heat dissipation capacity of the condensation section and improve the condensation efficiency. At the same time, the shorter evaporation section can reduce the loss of heat during the transfer process, so that more heat can be used for the evaporation of the working fluid. The reasonable length ratio of the evaporation section to the condensation section also helps to improve the stability of the entire heat pipe system. The shorter evaporation section can reduce the pressure fluctuation and temperature gradient of the working fluid during the evaporation process, while the longer condensation section helps to stabilize the condensation process of the steam. This design helps to reduce the instability factors of the system and improve the reliability and service life of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a schematic diagram of the overall structure of the rotating gravity heat pipe in the present invention; Figure 2 It is a cross-sectional view of the axial direction of the rotating gravity heat pipe of the present invention; Figure 3 It is a schematic diagram of the structure of the inner wall of the evaporation section in the rotary gravity heat pipe of the present invention; Figure 4 It is a cross-sectional view of the wall surface of the condensation section in the rotary gravity heat pipe of the present invention; Figure 5 It is a schematic diagram of the arrangement of the grooves in the rotating gravity heat pipe of the present invention.

[0025] Among them, 1. evaporation section, 2. insulation section, 3. condensation section, 4. thread structure, 5. fin assembly, 6. liquid absorption core, 7. groove, 8. rotating assembly, 9. centrifugal force automatic control device. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does 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 cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0030] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings: Example 1 like Figure 1~2 As shown, the present invention provides a self-assembled rotating gravity heat pipe, comprising an evaporation section 1, an insulation section 2 and a condensation section 3 which are detachably connected in sequence; the inner wall of the evaporation section 1 and the inner wall of the condensation section 3 are both provided with a threaded structure 4; the outer wall of the condensation section 3 is provided with a plurality of fin assemblies 5, and the plurality of fin assemblies 5 are hollow structures, and the hollow structures of the fin assemblies 5 are connected to the condensation section 3; the angle between the gravity heat pipe and the horizontal direction is adjustable within the range of 30 to 90 degrees. When in use, the heat pipe body can be fixed on a centrifugal force automatic control device 9 provided with a rotating assembly 8.

[0033] like Figure 3 As shown, in a preferred embodiment, taking the evaporation section 1 as an example, the width of the thread structure 4 is 1-5 mm, and the pitch is 1-5 mm. Figure 3 As shown in the structure at A, the pitch is Figure 3 The structure is shown in B.

[0034] In addition, in a preferred embodiment, the angle between the fin assembly 5 and the outer wall of the condensation section 3 is 30-60°. Figure 4 As shown in the structure at A, in a further preferred embodiment, the angle between the fin assembly 5 and the outer wall of the condensation section 3 is 45°.

[0035] In addition, in order to further improve the efficiency of heat exchange, the number of fin assemblies 5 in each circle on the outer wall of the condensing section 3 is 4 to 10, and they are evenly spaced along the circumferential direction of the outer wall of the condensing section 3, and each circle interval is 0.03 to 0.25 times the length of the condensing section. The ratio of the diameter of the condensing section 3 to the width of the fin assembly 5 is (0.6 to 3):1, the ratio to the thickness of the fin assembly 5 is (1.5 to 6):1, and the ratio to the length of the fin assembly 5 is (0.3 to 1):1.

[0036] More preferably, the fin assembly 5 of the present invention has a width of 1 to 5 cm, a thickness of 0.5 to 2 cm, and a length of 3 to 10 cm, wherein the width is as follows: Figure 2 The distance in the A direction and the thickness are as follows Figure 2 The distance in the B direction is as follows: Figure 2 The distance in the C direction.

[0037] In addition, the fins in the present invention can also be flat or cylindrical, and the ratio of the length of the liquid-absorbing core to the fins is (0.4-0.8):1.

[0038] In a preferred solution, the ratio of the length of the evaporation section 1 to the length of the condensation section 3 is 1:(1-2). In addition, in order to further improve the efficiency of heat exchange, a liquid wick 6 is provided in the fin assembly 5. The liquid wick 6 is at least one of a metal mesh, graphite felt or ceramic fiber.

[0039] In addition, if Figure 5 As shown, in order to facilitate the arrangement of the liquid absorbent core 6, a groove 7 is provided on the inner wall of the condensation section 3, and the liquid absorbent core 6 is embedded in the groove 7, with the other end extending along the hollow inner cavity of the condensation section 3.

[0040] Experiments have shown that the total heat transfer efficiency of the gravity heat pipe of the present invention can be increased by 10% to 30% compared with the gravity heat pipe without modification.

[0041] In addition, the present invention also discloses a radiator including the gravity heat pipe.

[0042] In addition, the free ends of the evaporation section 1 and the condensation section 3 of the rotating gravity heat pipe of the present invention are both provided with end covers. The gravity heat pipe in the present invention can be of different shapes, including but not limited to cylindrical, semi-flat, flat, annular, ultra-thin flat groove, and separated; the insulation section 2 on the rotating gravity heat pipe is tightened together with the bracket by bolts, and the inclination angle of the gravity heat pipe on the bracket can be adjusted by loosening the bolts.

[0043] For the evaporation section 1, the insulation section 2 and the condensation section 3 that are detachably connected, the detachable structure includes at least one of a flange connection, a threaded connection and a socket connection.

[0044] In the present invention, the temperature range of the evaporation section of the gravity heat pipe can be 10-1000°C, and the temperature range of the condensation section can be -100-30°C.

[0045] When there are devices at both ends of the gravity heat pipe that need to be sealed, the sealing method can be at least one of flange, vacuum quick connector, ball valve, mechanical seal, vacuum seal, adhesive seal, spiral seal, wear seal, labyrinth seal, double cone seal, Kazari seal, dry gas seal, labyrinth seal, non-contact seal, liquid seal, bellows seal, hollow metal O-type seal, ferrule seal, floating ring seal, rubber O-ring seal, cone seal, and polytetrafluoroethylene braided seal according to needs.

[0046] In addition, 3D printing technology can be used to realize the evaporation section 1, the insulation section 2 and the condensation section 3 that can be detachably connected, which reduces the difficulty of the manufacturing process and the loss of required materials. Different from the smooth wall of the evaporation section and the condensation section of the traditional gravity heat pipe: after the inner wall of the evaporation section is modified, the heat conduction area between the evaporation section wall and the fluid is increased, the number of bubbles generated by the heat vaporization of the wall working fluid increases, the turbulence of the evaporation section fluid is increased, the mixing speed of the high-temperature fluid on the tube wall and the low-temperature fluid in the center of the tube is accelerated, the heat conduction efficiency of the evaporation section is improved, and the rate of hot steam transfer from the evaporation section to the condensation section is also increased; after the inner wall of the condensation section is modified, the convective heat transfer area of ​​the inner wall of the condensation section is increased, the increase in the inner wall area of ​​the condensation section promotes the formation of droplet condensation, and the film-like condensation liquid film formed is thinner and more uniform, which increases the convective heat transfer coefficient of the inner wall of the condensation section and improves the heat transfer efficiency; after the outer wall of the condensation section is modified, the contact area between the outer wall of the condensation section and the outside world is increased, and the heat exchange effect is enhanced. In addition, the inclination angle of the heat pipe can be changed to improve the heat exchange efficiency. Riveted structures are added to the joints of the heat pipe sections, and the length of each section can be changed.

[0047] Example 2 The inner wall surface of the evaporation section 1 and the inner wall surface of the condensation section 3 are modified with a thread structure 4, and the outer wall surface of the condensation section 3 is modified with a fin modification structure. Further, the width of the thread structure 4 is 3 mm, the pitch is 3 mm, the angle between the fin assembly 5 and the outer wall of the condensation section 3 is 40°, the width of the fin assembly 5 is 3 cm, the thickness is 1 cm, and the length is 7 cm. The ratio of the length of the evaporation section 1 to the condensation section 3 is 1:1, and the heat exchange performance and heat transfer efficiency of the rotating gravity heat pipe device are studied.

[0048] Due to the presence of the threaded structure 4 on the inner wall surface of the evaporation section 1, the heating area of ​​the liquid working medium receiving the heat source in the evaporation section 1 increases, the locations where bubbles are generated become more, it is easier to disturb the laminar fluid, and the heat can be transferred to the condensation section 3 in the form of steam more quickly; the threaded structure 4 modified on the inner wall surface of the condensation section 3 increases the area of ​​the inner wall surface of the condensation section 3, droplet condensation is easier to form, and the liquid film formed by film condensation is thinner and more uniform. The fin modification structure arranged on the inner wall surface of the condensation section 3 increases the heat transfer coefficient of the inner wall surface of the condensation section 3, increases the contact area between the outer wall surface of the condensation section 3 and the outside world, increases the specific surface area, and improves the heat transfer performance of the heat pipe.

[0049] The heat transfer efficiency of the heat exchange tube in this embodiment is improved by 12% compared with adding only the modified structure on the outer wall of the condensing section 3. Keeping all conditions unchanged, the heat pipe is rotated from an angle of 30° to a horizontal plane to an angle of 90°, and the total heat transfer efficiency is improved by 25%.

[0050] Example 3 The difference between this embodiment and embodiment 2 is that the angle between the gravity heat pipe and the horizontal plane is adjusted to 30°, and the ratio of the length of the evaporation section 1 to the condensation section 3 is adjusted to 1:1.5. The other conditions are the same as those in embodiment 2. Since the length of the condensation section 3 is longer, the area where the liquid working medium receives the cold source becomes larger, the heated area increases, and there are more locations where bubbles are generated, and the overall heat transfer efficiency is improved by 20%.

[0051] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A self-assembled rotating gravity heat pipe, characterized in that: It comprises an evaporation section (1), an insulation section (2) and a condensation section (3) which are detachably connected in sequence; The inner wall of the evaporation section (1) and the inner wall of the condensation section (3) are both provided with a threaded structure (4); The outer wall of the condensing section (3) is provided with a plurality of fin assemblies (5), the plurality of fin assemblies (5) are hollow structures, and the hollow structures of the fin assemblies (5) are connected to the condensing section (3); The angle between the gravity heat pipe and the horizontal direction can be adjusted within the range of 30 to 90 degrees.

2. The self-assembled rotating gravity heat pipe according to claim 1, characterized in that: The thread structure (4) has a width of 1 to 5 mm and a thread pitch of 1 to 5 mm.

3. The self-assembled rotating gravity heat pipe according to claim 1, characterized in that: The included angle between the fin assembly (5) and the outer wall of the condensation section (3) is 30 to 60 degrees.

4. The self-assembled rotating gravity heat pipe according to claim 1, characterized in that: The included angle between the fin assembly (5) and the outer wall of the condensation section (3) is 45°.

5. The self-assembled rotating gravity heat pipe according to claim 1, characterized in that: The ratio of the diameter of the condensing section (3) to the width of the fin assembly (5) is (0.6-3):1, the ratio of the diameter of the condensing section (3) to the thickness of the fin assembly (5) is (1.5-6):1, and the ratio of the diameter of the condensing section (3) to the length of the fin assembly (5) is (0.3-1):

1.

6. The self-assembled rotating gravity heat pipe according to claim 1, characterized in that: A liquid wick (6) is provided inside the fin assembly (5).

7. The self-assembled rotating gravity heat pipe according to claim 6, characterized in that: The liquid wick (6) is at least one of a metal mesh, graphite felt or ceramic fiber.

8. The self-assembled rotating gravity heat pipe according to claim 6, characterized in that: The inner wall of the condensation section (3) is provided with a groove (7), one end of the liquid absorbent core (6) is embedded in the groove (7), and the other end is extended along the hollow inner cavity of the condensation section (3).

9. The self-assembled rotating gravity heat pipe according to claim 1, characterized in that: The ratio of the length of the evaporation section (1) to the length of the condensation section (3) is 1:(1-2).

10. A radiator, characterized in that: The invention comprises the gravity heat pipe as described in any one of claims 1 to 9.

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