A heat pipe

Abstract

This invention provides a heat pipe comprising a shell, a wick, and a delivery wick. The wick includes an evaporation section wick and a condensation section wick, with the evaporation section wick located on the inner wall surface of the evaporation section and the condensation section wick located on the inner wall surface of the condensation section. Both the evaporation and condensation section wicks contain a liquid medium. The delivery wick is located within a vapor channel and connects the evaporation and condensation section wicks. This invention replaces the wick in the adiabatic section with a delivery wick, significantly increasing the liquid medium transport capacity and effectively improving the reflux effect of the liquid medium inside the heat pipe. The delivery wick reduces the impact of vapor flow on liquid transport, further enhancing the heat transfer performance of the heat pipe. Furthermore, the design of the delivery wick facilitates bending of the heat pipe, making it suitable for bending large-diameter heat pipes and improving the practicality of the heat pipe.

Description

Technical Field

[0001] This invention relates to the field of heat pipe technology, and more particularly to a high-conductivity heat pipe with a fluid delivery core. Background Technology

[0002] A heat pipe is a heat transfer element that fully utilizes the principles of heat conduction and the rapid heat transfer properties of phase change media. It quickly transfers heat from a heated object to the outside of the heat source, with a thermal conductivity exceeding that of any known metal. Its heat transfer rate and amount are hundreds of times greater than those of metals of the same volume. Theoretical research on heat pipes reached its peak in the late 1960s, and their widespread industrial application began in the 1970s. Particularly with the rapid development of computers, the inexpensive nature of heat pipes has led to their rapid development in solving heat dissipation problems.

[0003] like Figure 1 A traditional heat pipe mainly consists of a shell 1, a wick 2, and a vapor channel 3. The shell 1 is cylindrical, and the annular wick 2 is tightly attached to the inner wall of the shell 1, storing the liquid working medium inside the wick 2. Typically, one end of the heat pipe is the evaporation section 10, also called the heating section, and the other end is the condensation section 12, with an adiabatic section 11, also called the heat dissipation section, in the middle. When the surface of the evaporation section 10 of the heat pipe is heated, the working liquid inside the wick evaporates, carrying away heat; this heat is the latent heat of vaporization of the working liquid. The vapor flows from the vapor channel 3 to the condensation section 12 of the heat pipe, condenses into liquid, and releases latent heat, which dissipates through the wall. The liquid flows back to the evaporation section 10 under the capillary force of the wick 2, thus completing a closed loop and transferring a large amount of heat from the heating section to the adiabatic section 11.

[0004] With the emergence of new heat transfer demands, traditional heat pipes suffer from the following problems:

[0005] (1) As the transmission distance increases, the liquid transport capacity of the wick decreases significantly after the heat pipe length increases, and the heat transfer capacity of the heat pipe decreases accordingly.

[0006] (2) As the heat transfer power increases, the diameter of the heat pipe increases. After the heat pipe is bent, the liquid wick in the insulation section is easily separated from the inner wall of the pipe shell, resulting in a significant decrease in the heat transfer performance of the heat pipe.

[0007] (3) Due to the limitation of radial heat conduction of the wick, the wick is usually thin. The flowing vapor can easily blow out the liquid flowing back into the wick and carry it to the condensation section, which seriously affects the heat transfer performance of the heat pipe. Summary of the Invention

[0008] This invention provides a heat pipe that addresses the shortcomings of existing heat pipes, such as insufficient liquid delivery function of the wick due to the simple internal structure, which affects the heat transfer performance of the heat pipe, and the inability of large-diameter heat pipes to be bent. This invention enables bending operations on large-diameter heat pipes and further improves the heat transfer performance of the heat pipe.

[0009] This invention provides a heat pipe, comprising:

[0010] The outer shell has an internal sealed cavity, which includes an evaporation section, a condensation section, and an insulation section. The evaporation section is located at one end of the sealed cavity, the condensation section is located at the other end of the sealed cavity, and the insulation section is located between the evaporation section and the condensation section. A steam passage is provided between the evaporation section and the condensation section, penetrating the insulation section.

[0011] The liquid suction core includes an evaporation section liquid suction core and a condensation section liquid suction core. The evaporation section liquid suction core is disposed on the inner wall surface of the evaporation section, and the condensation section liquid suction core is disposed on the inner wall surface of the condensation section. A liquid phase medium is disposed inside the evaporation section liquid suction core and the condensation section liquid suction core.

[0012] The infusion core is located within the steam channel and is connected between the liquid absorption core of the evaporation section and the liquid absorption core of the condensation section.

[0013] According to one embodiment of the present invention, the infusion core includes a porous tube and a porous medium layer. The porous tube has a plurality of first through holes on its surface. The porous medium layer surrounds the porous tube. The porous medium layer has a plurality of second through holes on its surface. The first through holes and the second through holes communicate with the inner and outer sides of the infusion core.

[0014] According to one embodiment of the present invention, the diameter of the second through hole is smaller than the diameter of the first through hole.

[0015] According to one embodiment of the present invention, the porous tube and the porous dielectric layer are both wire mesh structures, and the porous tube and the porous dielectric layer are sintered together.

[0016] According to one embodiment of the present invention, both ends of the porous tube are sealed.

[0017] According to one embodiment of the present invention, a thin film is provided on the surface of the infusion core located in the insulation section, the thin film is wrapped around the surface of the porous medium layer, and a plurality of third through holes are formed on the surface of the thin film.

[0018] According to one embodiment of the present invention, the infusion core is provided in multiple forms, the number of which is proportional to the inner diameter of the sealed cavity.

[0019] According to one embodiment of the present invention, the liquid-absorbing core has a porous structure, and the liquid-absorbing core is sintered with the liquid-infusion core.

[0020] According to one embodiment of the present invention, the outer shell is cylindrical in shape, the radial cross-section of the sealed cavity is circular, the liquid-absorbing core is laid on the inner surface of the sealed cavity near the end, and the infusion core is attached to the surface of the liquid-absorbing core.

[0021] According to one embodiment of the present invention, the porous tube is cylindrical in shape, and two porous tubes are provided, which are arranged side by side. The porous medium layer wraps around the two porous tubes so that both sides of the porous medium layer are flat, and one flat side of the porous medium layer is in contact with the surface of the liquid absorption core.

[0022] The heat pipe provided by this invention includes a shell, a liquid-absorbing core, and a liquid-transferring core. The shell has a sealed cavity inside, comprising an evaporation section, a condensation section, and an insulation section. The evaporation section is located at one end of the sealed cavity, the condensation section at the other end, and the insulation section between the evaporation and condensation sections. A vapor channel penetrating the insulation section is provided between the evaporation and condensation sections. The liquid-absorbing core includes an evaporation section liquid-absorbing core and a condensation section liquid-absorbing core. The evaporation section liquid-absorbing core is located on the inner wall surface of the evaporation section, and the condensation section liquid-absorbing core is located on the inner wall surface of the condensation section. A liquid phase medium is contained within both the evaporation and condensation section liquid-absorbing cores. The liquid-transferring core is located within the vapor channel and connects the evaporation section liquid-absorbing core and the condensation section liquid-absorbing core. This invention uses a liquid-conducting core connecting the evaporation and condensation sections. In the evaporation section, liquid enters the liquid-conducting core from the liquid-conducting core and diffuses along the inner wall of the evaporation section, absorbing heat and evaporating into steam. The steam travels along the steam channel through the insulation section and condenses on the wall of the liquid-conducting core in the condensation section, releasing heat. The condensate collects along the inner wall of the condensation section within the liquid-conducting core and returns to the liquid-conducting core. The liquid then returns to the evaporation section along the liquid-conducting core, completing a full cycle. This invention replaces the insulation section's liquid-conducting core with a liquid-conducting core, avoiding the drawbacks of traditional heat pipes where excessive length leads to reduced liquid transport capacity and insufficient heat transfer performance. The liquid-conducting core significantly increases the liquid medium transport volume, effectively improving the reflux effect of the liquid medium inside the heat pipe, thereby enhancing the heat transfer performance. Simultaneously, the liquid-conducting core reduces the impact of steam flow on liquid transport, further improving the heat transfer performance of the heat pipe. Furthermore, the design of the liquid-conducting core facilitates heat pipe bending, making it suitable for bending large-diameter heat pipes and improving the practicality of the heat pipe. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a heat pipe in the prior art;

[0025] Figure 2 This is a schematic diagram of the heat pipe structure provided in an embodiment of the present invention;

[0026] Figure 3 yes Figure 2 Cross-sectional view of AA;

[0027] Figure 4 This is a cross-sectional view of the infusion core provided in an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of a porous tube structure provided in an embodiment of the present invention;

[0029] Figure 6 This is a cross-sectional view of another embodiment of the heat pipe provided by the present invention.

[0030] Figure label:

[0031] 1: Outer shell; 10: Evaporation section; 11: Insulation section; 12: Condensation section; 2: Liquid suction core; 3: Vapor channel; 4: Liquid delivery core; 41: Porous tube; 411: First through hole; 42: Porous media layer. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0033] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0035] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0037] like Figure 2 As shown, an embodiment of the present invention provides a heat pipe, which consists of a shell 1, a liquid-absorbing core 2, and a liquid-transmitting core 4.

[0038] The outer shell 1 is a closed structure. The inner part of the outer shell 1 is a sealed cavity, which is divided into three sections: evaporation section 10, condensation section 12 and insulation section 11. The evaporation section 10 is located at one end of the sealed cavity. This section is also called the heating section and is used for heating the heat pipe.

[0039] The condensation section 12 is located at the other end of the sealed cavity, that is, the condensation section 12 and the evaporation section 10 are located at opposite ends of the outer shell 1.

[0040] The adiabatic section 11 is located between the evaporation section 10 and the condensation section 12, and the adiabatic section 11 is continuous with the evaporation section 10 and the condensation section 12.

[0041] The cavity between the evaporation section 10 and the condensation section 12 is a steam channel 3, which runs through the entire cavity. The steam channel 3 is used for steam flow and guides the steam generated after heating the evaporation section 10 to the condensation section 12.

[0042] In this embodiment, the traditional absorbent core has been improved, such as... Figure 2 As shown, the liquid suction core consists of two independent structures. Liquid suction core 2 includes an evaporation section liquid suction core and a condensation section liquid suction core. The evaporation section liquid suction core is located on the inner wall surface of the evaporation section 10, and the condensation section liquid suction core is located on the inner wall surface of the condensation section 12. Liquid suction core 2 covers the inner walls of the evaporation section 10 and the condensation section 12 to increase the contact area.

[0043] The wick 2 contains a liquid medium, which transfers heat through gas-liquid conversion. Since the liquid medium circulates between the evaporation section 10 and the condensation section 12, it is essential that both the wicks in the evaporation and condensation sections contain the liquid medium. Of course, under normal heat pipe conditions without heating, the liquid medium is stored in the wick of the evaporation section.

[0044] In this embodiment, a liquid delivery core 4 is provided between the liquid absorption core of the evaporation section and the liquid absorption core of the condensation section. The liquid delivery core 4 passes through the insulation section 11 and is located in the steam channel 3. One end of the liquid delivery core 4 is in contact with the liquid absorption core of the evaporation section, and the other end of the liquid delivery core 4 is between the liquid absorption core of the condensation section and the liquid absorption core of the condensation section.

[0045] That is, the present invention eliminates the liquid wick of the adiabatic section 11 in the traditional heat pipe, and replaces the liquid wick of the adiabatic section 11 in the traditional heat pipe by setting a liquid delivery wick 4. The liquid delivery wick 4 is connected to the liquid wick of the evaporation section and the liquid wick of the condensation section, realizing the liquid delivery from the condensation section 12 to the evaporation section 10, thus ensuring the heat transfer performance of the heat pipe.

[0046] In this embodiment of the invention, the liquid infusion core 4 connects the liquid absorption core 2 of the evaporation section 10 and the condensation section 12. In the evaporation section, the liquid enters the liquid absorption core 2 from the liquid infusion core 4 and diffuses along the liquid absorption core 2 in the evaporation section 10. After absorbing heat, it evaporates into steam. The steam passes through the insulation section 11 along the steam channel 3 and condenses on the wall of the liquid absorption core 2 in the condensation section 12, releasing heat. The condensate collects in the liquid absorption core 2 along the inner wall of the condensation section 12 and returns to the liquid infusion core 4. The liquid then returns to the evaporation section 10 along the liquid infusion core 4, thus completing a complete cycle.

[0047] This invention replaces the liquid-absorbing core of the insulating section 11 with a liquid-feeding core 4, avoiding the drawbacks of traditional heat pipes where excessive length leads to reduced liquid transport capacity and insufficient heat transfer performance. This liquid-feeding core 4 significantly increases the transport volume of the liquid medium, effectively improving the reflux effect of the liquid medium inside the heat pipe, thereby enhancing the heat transfer performance of the heat pipe.

[0048] Meanwhile, compared with the traditional liquid wick 2 being laid on the entire inner surface of the insulation section 11, the liquid delivery wick 4 occupies a significantly smaller area in the steam channel 3 than the traditional liquid wick 2. The liquid is conducted through the liquid delivery wick 4, reducing the impact of steam flow on liquid transport and further improving the heat transfer performance of the heat pipe.

[0049] Because the infusion core 4 is very small, much smaller than the heat pipe outer shell 1, and relatively independent, it can be bent along with the heat pipe outer shell 1 without causing a performance degradation. The design of the infusion core 4 is more conducive to the bending of the heat pipe, making it suitable for bending large-diameter heat pipes and improving the practicality of the heat pipe.

[0050] like Figure 3 As shown, the infusion core 4 of this embodiment of the invention is composed of a porous tube 41 and a porous media layer 42. The porous tube 41 is as follows: Figure 5 As shown, its surface has multiple first through holes 411, the porous medium layer 42 is wrapped around the porous tube 41, the surface of the porous medium layer 42 has multiple second through holes, and the first through holes 411 and the second through holes connect the inner and outer sides of the infusion core 4.

[0051] The apertures of the first through hole 411 and the second through hole can allow liquid to enter the porous medium layer 42 from the porous tube 41, and also allow liquid to enter the porous tube 41 from the porous medium layer 42, ensuring that the liquid is not obstructed in the infusion core 4.

[0052] Preferably, the two ends of the porous tube 41 are designed to be closed, or the two ends of the porous tube 41 are pressed against the two ends of the heat pipe to prevent liquid from leaking from the ends of the porous tube 41.

[0053] In this embodiment, the liquid inlet core 4 is designed as a porous tube 41 and a porous medium layer 42, with through holes on its surface, effectively achieving liquid flow guidance and ensuring that the liquid flows back from the condensation section 12 to the evaporation section 10, thus guaranteeing the medium circulation of the heat pipe. Furthermore, the design of the porous tube 41 and the porous medium layer 42 enables gas-liquid separation, avoiding the influence of vapor flow on liquid backflow. This effectively prevents vapor from blowing back the liquid and carrying it to the condensation section 12, thus preventing any impact on the heat transfer performance of the heat pipe.

[0054] In this embodiment, the inner cavity of the porous tube 41 provides a flow channel for the liquid. Since the hydraulic diameter of the liquid flow channel is large, the resistance to liquid flow is greatly reduced, thus greatly increasing the liquid transport capacity. This has a significant effect on improving the heat transfer capacity of the heat pipe, especially under weightless conditions.

[0055] In one embodiment, the pore size of the inner surface of the porous media layer 42 is smaller than the pore size of the surface of the porous tube 41. This allows the porous media layer 42 to have a certain resistance and capillary force, preventing the liquid from escaping from the infusion core 4, while providing a driving force for the flow of the liquid.

[0056] like Figure 4 As shown, in one embodiment, the porous tube 41 is a straight tube, and the porous medium layer 42 is a wire mesh layer. The pore size of the wire mesh layer is significantly smaller than the pore size of the through holes on the surface of the porous tube 41, which can more effectively prevent the liquid from leaving the infusion core 4.

[0057] Of course, in some embodiments, the porous tube 41 can also be replaced by a support structure formed by wire mesh.

[0058] To ensure the structural stability of the infusion core 4 and prevent loosening, the porous tube 41 and the wire mesh layer are sintered together. Of course, the porous tube 41 and the wire mesh layer can also be connected by adhesive, welding or snap-fit.

[0059] In one embodiment, the thickness of the porous media layer 42 is greater than the thickness of the absorbent core 2. That is, the mesh layer of the infusion core is thicker than the thickness of the absorbent core 2, which can effectively reduce the impact of vapor flow on liquid transport.

[0060] As a further improvement, in one embodiment, a thin film is provided on the surface of the infusion core 4 located within the insulation section 11. Specifically, the film is wrapped around the surface of the porous media layer 42, that is, wrapped around the surface of the wire mesh layer, which can completely isolate the influence of vapor flow on liquid backflow. Multiple third through holes are provided on the surface of the film, with each through hole spaced 5-10 mm apart, to facilitate the discharge of air bubbles in the liquid channel.

[0061] In one embodiment, such as Figure 6 As shown, when the diameter of the heat pipe shell 1 is large, the required flow rate of the liquid medium will also be relatively large. Multiple liquid inlet cores 4 can be provided to provide a higher liquid return flow rate. The number of liquid inlet cores 4 is directly proportional to the diameter of the heat pipe shell 1 or the inner diameter of the sealed cavity.

[0062] In one embodiment, the absorbent core 2 has a porous structure, which can be a layered wire mesh, stacked spheres, or other porous structure. The absorbent core 2 of the evaporation section 10 and the condensation section 12 can be sintered on the inner wall of the outer shell 1. The wire mesh layer outside the infusion core 4 is also generally connected to the absorbent core 2 by sintering to prevent it from loosening.

[0063] like Figure 3 and Figure 4 As shown, in one embodiment, the outer shell 1 is cylindrical, the radial cross-section of the sealed cavity is circular, the liquid-absorbing core 2 is laid on the inner surface of the sealed cavity near the end, and the liquid-transferring core 4 is attached to the surface of the liquid-absorbing core 2. In this embodiment, the end of the liquid-transferring core 4 should have as much contact with the liquid-absorbing core 2 as possible to increase the contact area with the liquid-absorbing core 2. This helps the condensate to collect in the liquid-transferring core 2 along the circumferential direction within the liquid-absorbing core 2, and also facilitates the diffusion of liquid in the liquid-transferring core 2 into the liquid-absorbing core 2 of the evaporation section 10, thereby improving the heat transfer performance of the heat pipe.

[0064] When the infusion core 4 uses a single circular porous tube 41, the outer surface of the outer mesh layer is circular, making it difficult to form a certain contact area with the absorbent core 2. If the number of porous tubes increases, it is not conducive to minimizing its size, because the infusion core 4 will occupy the flow area of ​​the steam channel 3. Therefore, in one embodiment, two porous tubes 41 of the infusion core 4 are preferably used.

[0065] like Figure 4 As shown, two porous tubes 41 are arranged parallel and tangentially, and a wire mesh is wound around the periphery of the porous tubes 41 to form a porous medium layer 42 of a certain thickness. The wire mesh is wrapped around the periphery of the two porous tubes 41 so that both sides of the wire mesh are flat. The flat side of the wire mesh is in contact with the surface of the liquid-absorbing core 2, which increases the contact area between the liquid-conducting core 4 and the liquid-absorbing core 2. In this way, not only is the effect of liquid collection or diffusion improved and the heat transfer performance enhanced, but the installation stability of the liquid-conducting core 4 is also improved.

[0066] It is worth mentioning that, in this embodiment, the triangular area formed by the wire mesh and the two porous tubes 41 is also one of the main channels for liquid flow, which increases the liquid transport capacity.

[0067] like Figure 6 As shown, as a further improvement, when the diameter of the heat pipe shell 1 is increased, four liquid delivery cores 4 can be set between the liquid absorption core 2 of the evaporation section 10 and the condensation section 12. The four liquid delivery cores 4 are evenly arranged in the circumferential direction, which can ensure the diffusion of liquid in the evaporation section 10 and the collection of liquid in the condensation section 12, and ensure the uniform distribution of liquid medium.

[0068] Meanwhile, in order to further improve the collection or diffusion effect of the infusion core 4, the porous tube 41 can be set as a flat tube structure. The flat tube structure has an arc surface that matches the curvature of the surface of the absorbent core 2, and the other side is a concave surface. The arc surface is attached to the absorbent core 2, and the concave side faces the inside of the steam channel 3.

[0069] Within the evaporation section, liquid enters the suction core 2 within the evaporation section 10 from the four infusion cores 4 and diffuses along the circumference of the suction core 2 on the inner wall of the evaporation section. After absorbing heat, it evaporates into steam. The steam passes through the insulation section 11 along the steam channel 3 and condenses on the wall of the suction core 2 in the condensation section 12, releasing heat. The condensate collects along the circumference of the suction core into the four infusion cores 4, and then returns to the evaporation section 10 along the four infusion cores 4, thus completing a complete cycle.

[0070] The design of the porous tube 41 in this flat tube structure increases the cross-sectional area of ​​the porous tube 41, ensuring the liquid transport volume, and also ensuring the contact area between the liquid delivery core 4 and the liquid absorption core 2. At the same time, it reduces the occupation of the flow area of ​​the steam channel 3, ensuring the effective flow of steam. In the use of large-diameter heat pipes, it comprehensively improves the heat transfer performance of the heat pipe.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heat pipe, characterized in that, include: The outer shell (1) has a sealed cavity inside, which includes an evaporation section (10), a condensation section (12) and an insulation section (11). The evaporation section (10) is located at one end of the sealed cavity, the condensation section (12) is located at the other end of the sealed cavity, and the insulation section (11) is located between the evaporation section (10) and the condensation section (12). A steam passage (3) is provided between the evaporation section (10) and the condensation section (12) and passes through the insulation section (11). The liquid suction core (2) includes an evaporation section liquid suction core and a condensation section liquid suction core. The evaporation section liquid suction core is disposed on the inner wall surface of the evaporation section (10), and the condensation section liquid suction core is disposed on the inner wall surface of the condensation section (12). The evaporation section liquid suction core and the condensation section liquid suction core are provided with a liquid phase medium. The infusion core (4) is located in the steam channel (3) and is connected between the liquid absorption core of the evaporation section and the liquid absorption core of the condensation section. The infusion core (4) includes a porous tube (41) and a porous medium layer (42). The porous tube (41) has multiple first through holes (411) on its surface. The porous medium layer (42) wraps around the porous tube (41). The porous medium layer (42) has multiple second through holes on its surface. The first through holes (411) and the second through holes connect the inner and outer sides of the infusion core (4).

2. The heat pipe according to claim 1, characterized in that, The diameter of the second through hole is smaller than the diameter of the first through hole (411).

3. The heat pipe according to claim 2, characterized in that, The porous tube (41) and the porous medium layer (42) are both wire mesh structures, and the porous tube (41) and the porous medium layer (42) are sintered together.

4. The heat pipe according to claim 1, characterized in that, Both ends of the porous tube (41) are sealed.

5. The heat pipe according to claim 1, characterized in that, The infusion core (4) located in the insulation section (11) has a thin film on its surface. The thin film is wrapped around the surface of the porous medium layer (42). The surface of the thin film has multiple third through holes.

6. The heat pipe according to claim 1, characterized in that, The infusion core (4) is provided in multiple forms, the number of which is proportional to the inner diameter of the sealed cavity.

7. The heat pipe according to claim 1, characterized in that, The liquid-absorbing core (2) has a porous structure, and the liquid-absorbing core (2) is sintered with the liquid-infusion core (4).

8. The heat pipe according to any one of claims 1-7, characterized in that, The outer shell (1) is cylindrical in shape, the radial cross section of the sealed cavity is circular, the liquid-absorbing core (2) is laid on the inner surface of the sealed cavity near the end, and the infusion core (4) is attached to the surface of the liquid-absorbing core (2).

9. The heat pipe according to claim 8, characterized in that, The porous tube (41) is cylindrical in shape. There are two porous tubes (41) arranged side by side. The porous medium layer (42) wraps around the two porous tubes (41) so that the opposite sides of the porous medium layer (42) are flat. One side of the flat surface of the porous medium layer (42) is in contact with the surface of the liquid absorption core (2).

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