Loop heat pipe, loop heat pipe reactor and heat exchange system

Abstract

The application relates to the technical field of heat exchange, and provides a loop heat pipe, a loop heat pipe reactor and a heat exchange system. The loop heat pipe comprises an evaporation section, a steam pipeline, a condensation section and a liquid pipeline which are sequentially connected to form a circulation loop, the circulation loop is used for circulating flow of heat exchange fluid, a fuel rod and a wick are arranged in the evaporation section, and the heat exchange fluid in the evaporation section can exchange heat with the fuel rod through the wick. The loop heat pipe provided by the application improves the heat exchange efficiency between the fuel rod and the heat exchange fluid by improving the structure of the heat pipe, the condensation section of the loop heat pipe can be flexibly deformed, the condensation section is convenient to bend and process, and the loop heat pipe can be compactly and efficiently coupled with a thermoelectric conversion system for heat exchange.

Description

Technical Field

[0001] This invention relates to the field of heat exchange technology, and more particularly to loop heat pipes, loop heat pipe reactors, and heat exchange systems. 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 rapidly transfers heat from a heat-generating object to the outside of the heat source, with a thermal conductivity exceeding that of any known metal. A common form of high-temperature heat pipe is a circular straight tube structure with a sintered wick inside, filled with a certain amount of liquid metal, such as sodium, potassium, or lithium, as the working fluid. Due to its excellent heat transfer characteristics, heat pipes are used as heat transfer components between reactors and thermoelectric conversion systems; reactors using heat pipes for heat transfer are called heat pipe reactors. High-temperature heat pipes using alkali metals as the working fluid can achieve passive and efficient heat exchange, making them a potentially ideal heat exchange method between the reactor heat source and the thermoelectric conversion system. However, it is difficult to achieve a compact and efficient structural coupling between linear high-temperature heat pipes and the high-temperature heat exchangers of thermoelectric conversion systems.

[0003] High-temperature heat pipes with circular straight tube structures present certain challenges in heat transfer between the heat pipe and the reactor. Firstly, because both the heat pipe and the fuel are cylindrical, heat transfer between them relies entirely on another heat-conducting structure, requiring not only high strength but also a high thermal conductivity. Secondly, good thermal contact between the fuel and the heat pipe is essential. However, since the coefficients of thermal expansion and contraction of the heat pipe, fuel rod, and heat-conducting structure are difficult to match, achieving good thermal contact between the fuel and the heat-conducting structure, and between the heat pipe and the heat-conducting structure, is challenging. Consequently, under the same heat pipe condensation section temperature conditions, the fuel operating temperature is higher. The ideal heat transfer temperature of a heat pipe is typically above 750℃. If a significant temperature difference exists between the heat pipe and the fuel, the fuel rod temperature will be even higher, posing substantial difficulties for fuel rod development. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in related technologies. To this end, this invention proposes a loop heat pipe that improves the heat exchange efficiency between the fuel rod and the heat exchange fluid by improving the structure of the heat pipe. The condensation section of the loop heat pipe is flexible and deformable, facilitating bending and processing, and can be compactly and efficiently coupled with a thermoelectric conversion system.

[0005] The present invention also proposes a loop heat pipe reactor.

[0006] The present invention also proposes a heat exchange system.

[0007] According to a first aspect of the present invention, a loop heat pipe includes an evaporation section, a steam pipe, a condensation section, and a liquid pipe that are sequentially connected to form a loop. The loop is used for circulating heat exchange fluid. A fuel rod and a wick are disposed in the evaporation section. The heat exchange fluid in the evaporation section can exchange heat with the fuel rod through the wick.

[0008] According to one embodiment of the present invention, the liquid-absorbing core includes a first liquid-absorbing core and a second liquid-absorbing core, a flow channel is provided between the first liquid-absorbing core and the second liquid-absorbing core, the first liquid-absorbing core covers the outer side of the fuel rod, and the second liquid-absorbing core is attached to the inner wall of the shell of the evaporation section.

[0009] According to one embodiment of the present invention, the evaporation section is connected to a liquid collection tank for containing the heat exchange fluid, and the liquid collection tank is in fluid communication with the liquid suction core.

[0010] According to one embodiment of the present invention, the liquid-absorbing core is positioned between the space within the evaporation section and the liquid collection tank.

[0011] According to one embodiment of the present invention, the liquid suction core is provided with a plug-in portion, which is inserted into the liquid collection tank.

[0012] According to one embodiment of the present invention, the absorbent core includes an absorbent core bridge, which connects the first absorbent core and the second absorbent core.

[0013] According to one embodiment of the present invention, the liquid outlet end of the liquid pipeline is inserted into the evaporation section, and the liquid outlet end is inserted into the liquid absorption core and there is a gap between the liquid outlet end and the liquid absorption core; or, the liquid outlet end is provided with a gas collection groove so as to connect the liquid outlet end and the evaporation section through the gas collection groove.

[0014] According to one embodiment of the present invention, the cross-sectional area of ​​the condensation section is smaller than the cross-sectional area of ​​the evaporation section.

[0015] According to a second aspect of the present invention, a loop heat pipe reactor includes a heat-conducting structure and a plurality of loop heat pipes as described in any one of the above claims, wherein the plurality of evaporation sections conduct heat through the heat-conducting structure.

[0016] A heat exchange system according to a third aspect embodiment of the present invention includes:

[0017] Load device;

[0018] A loop heat pipe as described in any of the above, or a loop heat pipe reactor as described above;

[0019] The condensation section exchanges heat with the load device.

[0020] According to one embodiment of the present invention, at least one of the condensing sections exchanges heat with one of the load devices, at least one of the condensing sections exchanges heat with another of the load devices, and the plurality of evaporating sections conduct heat through a heat-conducting structure.

[0021] The above-described one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0022] The loop heat pipe of this invention includes an evaporation section, a steam pipe, a condensation section, and a liquid pipe that connect to form a loop. A fuel rod is installed in the evaporation section, and the heat of the fuel rod can be directly absorbed by the heat exchange fluid in the wick outside the fuel rod. By embedding the fuel rod in the evaporation section of the loop heat pipe, the heat exchange efficiency between the fuel rod and the heat exchange fluid is improved, solving the problems of large heat transfer temperature difference and high fuel rod operating temperature in heat pipe reactors. Furthermore, the condensation section of the loop heat pipe has a small diameter, which facilitates bending and processing, solving the problem of the heat pipe being difficult to bend.

[0023] Furthermore, multiple loop heat pipes can be combined to form a loop heat pipe reactor system, reducing the heat exchange temperature difference between the fuel rods and the heat pipes. Simultaneously, the small diameter of the condenser section of the loop heat pipe allows for flexible deformation. When the loop heat pipe is applied to a thermoelectric conversion system, it releases heat to the system through the condenser section, achieving a compact and efficient heat exchange coupling between the loop heat pipe and the thermoelectric conversion system.

[0024] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the loop heat pipe provided in an embodiment of the present invention;

[0027] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure of AA;

[0028] Figure 3 yes Figure 1 Schematic diagram of the cross-sectional structure of BB;

[0029] Figure 4This is a schematic diagram showing the positional relationship between the evaporation section and the heat-conducting structure of the loop heat pipe reactor provided in an embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of the heat exchange system provided in an embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the connection relationship between the loop heat pipe reactor and the generator provided in an embodiment of the present invention;

[0032] Figure label:

[0033] 1. Evaporation section; 2. Steam pipeline; 3. Condensation section; 4. Liquid pipeline; 5. Fuel rod; 6. Liquid suction core; 61. First liquid suction core; 62. Second liquid suction core; 63. Liquid suction core bridge; 64. Connecting part; 7. Liquid collection tank; 8. Gas collection tank; 9. Heat-conducting structure; 10. Load device; 11. Thermoelectric conversion system. Detailed Implementation

[0034] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0035] 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 used only for the convenience of describing the embodiments of the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise stated, "multiple," "multiple roots," and "multiple groups" mean two or more.

[0036] 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.

[0037] 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 indicates 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 indicates that the first feature is at a lower horizontal level than the second feature.

[0038] 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.

[0039] An embodiment of the first aspect of the present invention, in conjunction with Figures 1 to 3 As shown, a loop heat pipe is provided, including an evaporation section 1, a steam pipe 2, a condensation section 3 and a liquid pipe 4 connected in sequence to form a loop. The loop allows heat exchange fluid to circulate. A fuel rod 5 and a liquid wick 6 are provided in the evaporation section 1. The heat exchange fluid in the evaporation section 1 can exchange heat with the fuel rod 5 through the liquid wick 6.

[0040] The heat pipe in the loop contains a fuel rod 5. The heat exchange fluid is mainly liquid in the evaporation section 1. The heat generated by the fuel rod 5 is absorbed by the liquid heat exchange fluid in the wick 6. The liquid heat exchange fluid absorbs heat and evaporates into steam. The gaseous heat exchange fluid enters the condensation section 3 through the steam pipe 2. In the condensation section 3, the gaseous heat exchange fluid condenses and releases heat, becoming liquid again. The liquid heat exchange fluid enters the evaporation section 1 through the liquid pipe 4, and then absorbs heat from the fuel rod 5 through the wick 6 in the evaporation section 1 to begin another cycle. The heat exchange fluid can be a metal with a low melting point, such as sodium, potassium, lithium, or cesium, to increase its operating temperature.

[0041] In some cases, the fuel rod 5 is located at the center of the evaporation section 1, and its surface is covered with a wick 6. This simple structure allows for uniform heat exchange within the evaporation section 1. While the fuel rod 5 is located within the evaporation section 1, its exact position is not limited. The wick 6 can cover the outside of the fuel rod 5, facilitating heat absorption by the heat exchange fluid within the wick 6 from the fuel rod 5. The wick 6 serves as the evaporation surface for the fuel rod 5, ensuring that the vapor temperature within the heat pipe is essentially equal to the surface temperature of the fuel rod 5, thus reducing the temperature difference between the fuel rod 5 and the heat pipe.

[0042] Because there is two-phase flow within the loop heat pipe, in order to ensure the controllability of the flow, the circulation loop of the loop heat pipe generally cannot be branched, and a loop heat pipe has only one circulation loop.

[0043] To ensure the smooth return of condensate to evaporation section 1, the diameters of condensation section 3 and liquid pipe 4 are typically small, usually a few millimeters. This can be understood as the cross-sectional area of ​​condensation section 3 being smaller than that of evaporation section 1, facilitating bending of condensation section 3 and promoting heat exchange with the load device 10. The load device 10 can absorb heat from condensation section 3, making the matching between condensation section 3 and load device 10 more flexible. The smaller pipe diameter facilitates bending, thus adapting to different spatial layouts. Condensation section 3 can fit against heat exchange surfaces of different shapes to achieve good thermal contact. Due to the small diameters of condensation section 3 and liquid pipe 4, the corresponding pipe walls are also thin, resulting in low wall thermal resistance, which helps reduce the temperature difference during heat transfer. Since steam undergoes condensation heat exchange in condensation section 3, and the heat exchange fluid undergoes phase change heat exchange, the temperature of the heat exchange fluid in condensation section 3 is essentially equal to that in evaporation section 1. Therefore, there is no significant temperature distribution on the load device 10, which requires heat absorption. When the load device 10 is part of the thermoelectric conversion system 11, it helps the thermoelectric conversion system 11 achieve better operating performance. Loop heat pipes are suitable for small power generators ranging from a few hundred watts to several kilowatts.

[0044] In this design, condensing section 3 can be understood as a segment of the loop heat pipe. The inlet end of condensing section 3 is the steam pipe 2, and the outlet end is the liquid pipe 4. Steam pipe 2, condensing section 3, and liquid pipe 4 can be connected as a reducing pipe or a pipe of equal diameter; the specific structure can be selected according to needs. The cross-sectional areas of steam pipe 2, condensing section 3, and liquid pipe 4 are all smaller than the cross-sectional area of ​​evaporating section 1, and these pipes are easily bendable. The cross-sectional shape of each segment of the loop heat pipe is not limited.

[0045] The condensing section 3 can be located within the load device 10 of the thermoelectric conversion system 11, transferring heat to the load device 10. The condensing section 3 can be wound around the surface of the load device 10 (when the load device is the thermoelectric conversion system 11, such as the condensing section 3 being wound around the high-temperature heat exchanger of the Stirling generator) so that the condensing section 3 contacts the load device 10 for heat exchange, reducing the contact thermal resistance between the two through welding or other methods; the condensing section 3 can also be a flow channel embedded inside the load device 10 (such as the condensing section 3 being embedded in the high-temperature heat exchanger of the Stirling generator) to achieve better heat exchange.

[0046] In some embodiments, reference is made to Figure 1 , Figure 5 and Figure 6 As shown, the evaporation section 1 is connected to a liquid collection tank 7 for containing the heat exchange fluid, and the liquid collection tank 7 is in fluid communication with the wicking core 6. The heat exchange fluid returning from the liquid pipeline 4 to the evaporation section 1 can first enter the liquid collection tank 7, and then be guided to the outside of the fuel rod 5 through the wicking core 6, so that the heat exchange fluid in the wicking core 6 can fully exchange heat with the fuel rod 5.

[0047] The liquid collection tank 7 can be located inside the evaporation section 1 or outside the evaporation section 1. The position of the liquid collection tank 7 is flexible and can be selected as needed.

[0048] refer to Figure 1 and Figure 2 As shown, the liquid collection tank 7 is located below the evaporation section 1. The liquid outlet end of the liquid pipeline 4 passes through the liquid collection tank 7 and is inserted into the liquid suction core 6, so that part of the heat exchange fluid is supplied to the liquid suction core 6 and part of it is collected in the liquid collection tank 7.

[0049] The liquid suction core 6 is positioned between the internal space of the evaporation section 1 and the space of the liquid collection tank 7. The liquid suction core 6 separates the two areas to ensure that steam can only flow into the steam pipe 2 of the evaporation section 1 and cannot directly enter the liquid collection tank 7.

[0050] In some embodiments, the liquid suction core 6 is provided with a plug-in portion 64, which is inserted into the liquid collection tank 7, so that the liquid suction core 6 is in full contact with the heat exchange fluid in the liquid collection tank 7, which helps the heat exchange fluid in the liquid collection tank 7 to be distributed in the liquid suction core 6.

[0051] The insertion part 64 of the liquid suction core 6 can be positioned between the evaporation section 1 and the liquid collection tank 7.

[0052] A notch is provided between the evaporation section 1 and the collection tank 7. An insertion part 64 of the wick 6 is located adjacent to the notch, passing through the notch and entering the collection tank 7. This insertion part 64 absorbs liquid from the collection tank 7 and transfers it to the wick 6 on the surface of the fuel rod 5. The capillary force of this insertion part 64 is the source of the pressure difference between the evaporation section 1 and the storage tank, driving steam and condensate to flow along the capillary channel. The capillary channel can be understood as the wick 6 having a dense, porous structure, with capillary channels formed inside. The pressure difference required for steam to flow through the steam pipe 2, condensation section 3, and liquid pipe 4 is the pressure difference generated by the capillary force of the wick 6.

[0053] In some embodiments, reference is made to Figure 1 and Figure 2 As shown, the liquid outlet of the liquid pipeline 4 is inserted into the evaporation section 1, and the liquid outlet is inserted into the liquid suction core 6 with a gap between them, so that the gas returning from the liquid outlet can flow through the gap, preventing the non-condensable gas mixed in the heat exchange fluid from accumulating in the liquid suction core 6.

[0054] If the liquid outlet is inserted into the plug-in part 64 and a gap is provided between the liquid outlet and the plug-in part 64, the gaseous heat exchange fluid discharged from the liquid outlet can flow through the gap.

[0055] The liquid pipe passes through the liquid collection tank 7 and is inserted into the liquid suction core 6 to ensure that the returning heat exchange fluid comes into contact with the central liquid suction core 6 as soon as possible; a certain gap is maintained between the liquid pipe and the liquid suction core 6, and the liquid is collected into the liquid collection tank 7 under the driving force of the returning heat exchange fluid.

[0056] In some embodiments, reference is made to Figure 6 As shown, a gas collecting tank 8 is provided at the liquid outlet end to connect the liquid outlet end and the evaporation section 1. The gaseous fluid discharged from the liquid outlet end is collected through the gas collecting tank 8. The gaseous fluid includes non-condensable gases, which are collected in the gas collecting tank 8 to prevent them from affecting the flow of the heat exchange fluid.

[0057] In some embodiments, reference is made to Figure 1 and Figure 3As shown, the liquid wick 6 includes a first liquid wick 61 and a second liquid wick 62. A flow channel is provided between the first liquid wick 61 and the second liquid wick 62. The first liquid wick 61 covers the outside of the fuel rod 5, and the second liquid wick 62 is attached to the inner wall of the shell of the evaporation section 1. The dual structure of the first liquid wick 61 and the second liquid wick 62 helps to evenly distribute the liquid heat exchange fluid in the evaporation section 1, thereby improving the evaporation capacity of the evaporation section 1. In addition, when the load device 10 corresponding to the heat pipe in this loop fails, the load device 10 cannot absorb heat from the condensing section 3. The fuel rod still provides heat, and the heat in the evaporating section 1 needs to be dissipated outward through the evaporating section 1. At this time, the heat exchange fluid in the evaporating section 1 can absorb heat from the fuel rod 5 through the first wick 61, and the heat exchange fluid in the evaporating section 1 can release heat to the shell of the evaporating section 1 through the second wick 62. The first wick 61 can be understood as the evaporation wick, and the second wick 62 can be understood as the condensation wick, ensuring that the heat of the fuel rod 5 is fully utilized.

[0058] The wick 6 includes a wick bridge 63, which connects the first wick 61 and the second wick 62, allowing the heat exchange fluid to flow between the first wick 61 and the second wick 62, which helps the liquid heat exchange fluid to absorb heat and evaporate.

[0059] refer to Figure 1 and Figure 3 As shown, in conjunction with the above, the liquid-absorbing core 6 mainly comprises two parts: the first liquid-absorbing core 61 is located at the center of the evaporation section 1, generating a capillary pressure difference between the evaporation section 1 and the collection tank 7, driving vapor and liquid to flow within the loop; the second liquid-absorbing core 62 is an annular thin layer, tightly attached to the inner wall of the evaporation section 1. In some cases, refer to... Figure 6 As shown, the liquid outlet of the liquid pipeline 4 passes through the liquid collection tank 7 and is inserted into the first liquid suction core 61 to ensure that the returning heat exchange fluid comes into contact with the first liquid suction core 61 as soon as possible. A certain gap is maintained between the liquid outlet and the first liquid suction core 61, mainly to prevent non-condensable gases mixed in the returning heat exchange fluid from accumulating in the first liquid suction core 61, so that they accumulate in the liquid collection tank 7 under the driving force of the heat exchange fluid.

[0060] In some cases, refer to Figure 1 As shown, the insertion part 64 at the end of the wick 6 extends into the collection tank 7 to absorb liquid from the collection tank 7 and then, through capillary force, feeds it into the first wick 61 for evaporation. The liquid pipe 4 is inserted into the insertion part 64 to ensure that the returning heat exchange fluid contacts the wick 6 immediately. A certain gap is maintained between the outlet end and the wick 6, mainly to prevent non-condensable gases mixed in the returning liquid from accumulating in the wick 6, causing them to accumulate in the collection tank 7 under the driving force of the returning liquid. Alternatively, [the following can be used]... Figure 6The structure includes a gas collection trough 8 at the end of the liquid pipeline 4 and above the liquid suction core 6. The gas collection trough 8 has an opening that connects to the liquid outlet end of the liquid pipeline 4 and serves as a dedicated collection space for non-condensable gases.

[0061] In order to enable the liquid in the first liquid-absorbing core 61 to be transported more smoothly to the surface of the annular second liquid-absorbing core 62 for evaporation, a connecting liquid-absorbing core bridge 63 is provided between the two to achieve liquid transport over a shorter distance.

[0062] The above content describes the structure of an independent loop heat pipe. The following section describes the reactor structure formed by combining multiple loop heat pipes.

[0063] An embodiment of the second aspect of the present invention is described below. Figure 4 and Figure 5 As shown, a loop heat pipe reactor is provided, including a heat-conducting structure 9 and a plurality of loop heat pipes as described above, wherein a plurality of evaporation sections 1 conduct heat through the heat-conducting structure 9.

[0064] By embedding fuel rods 5 inside the evaporation section 1 of the loop heat pipe and combining multiple loop heat pipes to form a reactor system, the heat exchange temperature difference between fuel rods 5 and heat pipes is reduced. At the same time, by taking advantage of the small diameter of the loop heat pipe and its ability to be easily deformed, the loop heat pipe reactor is applied to the thermoelectric conversion system 11, which can achieve compact and efficient heat exchange coupling between the loop heat pipe and the thermoelectric conversion system 11.

[0065] The evaporation sections 1 of the multiple loop heat pipes can be combined together via a heat-conducting structure 9, and covered with reflective material. Control rods or control drums (not shown in the figure) are then inserted to form a reactor system. The control rods or control drums can be used to control the fuel rods in the multiple loop heat pipes.

[0066] The condensing section 3 of each loop heat pipe can exchange heat with one thermoelectric conversion system 11 at the same time, or it can exchange heat with different thermoelectric conversion systems 11. That is, multiple condensing sections 3 can release heat to one load device 10 at the same time, or multiple condensing sections 3 can release heat to different load devices 10. However, it is not limited to one-to-one heat release, but can be one-to-one, many-to-one, many-to-many, etc.

[0067] In a loop heat pipe reactor, reference Figure 4 As shown, a heat-conducting structure 9 can be filled between the evaporation sections 1 to allow heat exchange between adjacent evaporation sections 1, making the temperature distribution of the entire reactor more uniform. The inner wall of the evaporation section 1 of each loop heat pipe is provided with a liquid wick 6, and a liquid wick bridge 63 is provided between the second liquid wick 62 on the inner wall of the evaporation section 1 and the first liquid wick 61 on the surface of the fuel rod 5 to facilitate better liquid flow between the two.

[0068] An embodiment of the third aspect of the present invention is described below. Figure 6 As shown, a heat exchange system is provided, including a load device 10 and a loop heat pipe as described above, wherein a condenser section 3 exchanges heat with the load device 10. The condenser section 3 is used to supply heat to the load device 10. The loop heat pipe can adopt any of the above embodiments, and the structure of the loop heat pipe and its effects can be referred to the above content, which will not be repeated here.

[0069] At least one condensing section 3 exchanges heat with one load device 10, at least one condensing section 3 exchanges heat with another load device 10, and multiple evaporating sections 1 conduct heat through a heat-conducting structure 9.

[0070] A fourth aspect of the present invention provides a heat exchange system including a load device 10 and a loop heat pipe reactor as described above, wherein a condensing section 3 exchanges heat with the load device 10. The condensing section 3 is used to supply heat to the load device 10. The loop heat pipe reactor can adopt any of the above embodiments, and the structure of the loop heat pipe and its effects can be referred to the above content, and will not be repeated here.

[0071] The above-described heat exchange system, provided in the third and fourth embodiments, allows the condenser section 3 to dissipate heat to the load device 10. The load device 10 can be a generator, water heater, hot air blower, etc., and the type of load device 10 is diverse and not limited here. (See reference) Figure 6 As shown, when the load device 10 is a generator, such as a Stirling generator, a standing wave generator, or other thermoacoustic generator, the condensing section 3 can be wound around the hot head surface of the Stirling generator. The condensing section 3 and the hot head surface are connected by a thermally conductive interface material or by welding to reduce the contact thermal resistance between them. Of course, the condensing section 3 can also be a flow channel embedded inside the high-temperature heat exchanger of the Stirling generator to achieve better heat exchange. The structure achieves a compact and efficient coupling, solving the problem of the unsatisfactory heat exchange coupling structure between the straight cylindrical heat pipe and the high-temperature heat exchanger in the Stirling generator.

[0072] The Stirling generator comprises a Stirling engine and a linear motor. The Stirling engine includes a high-temperature heat exchanger, a regenerator, and a water cooler arranged sequentially along the axial direction. These components are all annular and connected in sequence, coaxially arranged with the exhaust manifold. The high-temperature heat exchanger is heated, while the water cooler is maintained at a lower temperature. An axial temperature gradient is formed inside the regenerator. When this temperature gradient reaches a certain value, after excitation, the generator can maintain spontaneous acoustic oscillations, converting heat energy into electrical energy output. The high-temperature heat exchanger, as a key component of the Stirling generator, acts as a load device 10, absorbing heat from the condenser section 3. Heat is supplied to the Stirling generator via heat pipes. The small diameter of the heat pipes allows for flexible deformation, achieving a compact and efficient structural coupling between the heat pipes and the high-temperature heat exchanger of the Stirling generator.

[0073] The Stirling generator consists of two sets of Stirling engines and two sets of linear motors arranged symmetrically. The entire Stirling generator is arranged symmetrically from left to right to counteract the vibrations generated by the moving parts.

[0074] The above embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Although the invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of the invention do not depart from the spirit and scope of the invention and should be covered within the scope of the claims of the invention.

Claims

1. A loop heat pipe, characterized in that, It includes an evaporation section, a steam pipeline, a condensation section, and a liquid pipeline that are connected in sequence to form a circulation loop. The circulation loop is used for the circulation of heat exchange fluid. The evaporation section is equipped with a fuel rod and a liquid wick. The heat exchange fluid in the evaporation section can exchange heat with the fuel rod through the liquid wick. The liquid-absorbing core includes a first liquid-absorbing core and a second liquid-absorbing core, and a flow channel is provided between the first liquid-absorbing core and the second liquid-absorbing core. The first liquid-absorbing core covers the outside of the fuel rod, and the second liquid-absorbing core is attached to the inner wall of the shell of the evaporation section. The evaporation section is connected to a liquid collection tank for containing the heat exchange fluid. The liquid collection tank is in fluid communication with the liquid suction core, and the liquid suction core is separated between the space in the evaporation section and the liquid collection tank. The liquid-absorbing core is provided with a plug-in part, which is inserted into the liquid collection tank; The liquid outlet end of the liquid pipeline is inserted into the evaporation section, and the liquid outlet end is inserted into the liquid absorption core and there is a gap between the liquid outlet end and the liquid absorption core. Alternatively, the liquid outlet end is provided with a gas collection groove so as to connect the liquid outlet end and the evaporation section through the gas collection groove.

2. The loop heat pipe according to claim 1, characterized in that, The absorbent core includes an absorbent core bridge, which connects the first absorbent core and the second absorbent core.

3. The loop heat pipe according to claim 1 or 2, characterized in that, The cross-sectional area of ​​the condensation section is smaller than that of the evaporation section.

4. A loop heat pipe reactor, characterized in that, It includes a heat-conducting structure and a plurality of loop heat pipes as described in any one of claims 1 to 3, wherein the plurality of evaporation sections conduct heat through the heat-conducting structure.

5. A heat exchange system, characterized in that, include: Load device; The loop heat pipe according to any one of claims 1 to 3, or the loop heat pipe reactor according to claim 4; The condensation section exchanges heat with the load device.

6. The heat exchange system according to claim 5, characterized in that, At least one of the condensing sections exchanges heat with one of the load devices, at least one of the condensing sections exchanges heat with another of the load devices, and the plurality of evaporating sections conduct heat through a heat-conducting structure.

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