Loop heat pipe condenser and preparation method thereof

Abstract

The invention provides a loop heat pipe condenser and a preparation method thereof, the loop heat pipe condenser is applied to the technical field of radiators with large heat and high heat flux density, a channel path on a condensation plate is accurately arranged to be matched with the shape and the size of a condensation pipeline, efficient brazing connection of the condensation pipeline and the condensation plate is achieved, and the heat dissipation efficiency is improved. Therefore, the stability of the structure and the high efficiency of heat conduction are ensured. Besides, path self-adaptive bending shaping and fin customized assembly are combined, the contact tightness of the condensation pipeline and the condensation plate is remarkably enhanced, deformation of traditional welding is reduced, the risk of serious oxidation to the inner wall of the pipeline during other high-temperature welding is eliminated, and the interior of the pipeline is easier to clean. And efficient cooperative heat dissipation of the fins and the condensation plates is achieved through the modular riveting design, the heat dissipation efficiency and the overall performance of the condenser are improved, the manufacturing process is simplified, and the cost is reduced.

Description

Technical Field

[0001] This application relates to the technical field of heat sinks with high heat and high heat flux density, and particularly relates to a loop heat pipe condenser and a preparation method thereof. Background Art

[0002] With the rapid development of aerospace technology, spacecraft have higher and stricter requirements for heat dissipation and heat transfer units. As an efficient conduction heat integration system, a loop heat pipe utilizes the principle of gas-liquid phase change to achieve efficient heat transfer and is widely used in the aerospace field. It mainly consists of an evaporator, a vapor pipeline, a condenser, a liquid pipeline, and a reservoir. Among them, the condenser is responsible for cooling superheated steam and dissipating heat, and is a key component of the system.

[0003] However, there are many problems in the preparation method of traditional steel-aluminum condensers. When using structural adhesive or thermal conductive silicone grease to connect the condensation pipeline and the condensation plate, although the process is simple, there are problems such as low overall structural strength and poor thermal coupling performance. After improvement, the method of using high-temperature welding (usually vacuum brazing or flame brazing) to connect the condensation pipeline and the condensation plate can improve the connection performance, but the preparation process is complex, the temperature required for welding is high, it is easy to damage the strength, and complex welding equipment is required, resulting in high costs. For example, patent CN103639559A faces problems such as high welding temperature, poor compatibility of dissimilar metals, and easy damage to the weld seam during bending and shaping, resulting in large contact thermal resistance and limited heat dissipation efficiency.

[0004] Based on this, a new loop heat pipe condenser and a preparation method thereof are needed. Summary of the Invention

[0005] In view of this, the embodiments of this specification provide a loop heat pipe condenser and a preparation method thereof.

[0006] The embodiments of this specification provide the following technical solutions:

[0007] The embodiments of this specification provide a preparation method for a loop heat pipe condenser, including:

[0008] Opening a channel on one side surface of the condensation plate; wherein, the path of the channel is set according to the preset length and shape of the condensation pipeline;

[0009] Bending and shaping the condensation pipeline according to the path of the channel, and embedding the shaped condensation pipeline into the channel;

[0010] Brazing and connecting the condensation pipeline and the channel to integrate the condensation pipeline and the channel;

[0011] Cutting the fin module to match the condensation pipeline;

[0012] Cover the fin module above the condensation pipeline, and fix the fin module on the surface of the condensation plate by riveting.

[0013] An embodiment of this specification also provides a loop heat pipe condenser, which is prepared by using the preparation method of the loop heat pipe condenser described in this application. The loop heat pipe condenser includes: a condensation plate, a condensation pipeline, and a fin module;

[0014] On one side surface of the condensation plate, a channel for pre-burying the condensation pipeline is provided; wherein, the path of the channel is set according to the preset length and shape of the condensation pipeline;

[0015] The condensation pipeline is bent and shaped according to the path of the channel, and is welded to the channel by brazing;

[0016] The fin module covers above the condensation pipeline and is fixed on the surface of the condensation plate by riveting.

[0017] Compared with the prior art, the beneficial effects that can be achieved by at least one of the above technical solutions adopted in the embodiments of this specification at least include:

[0018] By precisely setting the path of the channel on the condensation plate to adapt to the shape and size of the condensation pipeline, efficient brazing connection between the condensation pipeline and the condensation plate is achieved, thereby ensuring the structural stability and high efficiency of heat conduction. In addition, combined with path-adaptive bending and shaping and customized fin assembly, the contact tightness between the condensation pipeline and the condensation plate is significantly strengthened, the deformation of traditional welding is reduced, the serious oxidation risk to the inner wall of the pipeline during other high-temperature welding is eliminated, the internal cleaning of the pipeline is made simpler, and efficient collaborative heat dissipation between the fins and the condensation plate is realized through modular riveting design, improving the heat dissipation efficiency and overall performance of the condenser, simplifying the manufacturing process, and reducing costs. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions of the embodiments of this application, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a schematic diagram of the prior art condenser preparation method;

[0021] Figure 2 It is a schematic diagram of the condenser preparation method in this application;

[0022] Figure 3 It is a flowchart of a preparation method of a loop heat pipe condenser in this application;

[0023] Figure 4 Schematic diagram of the welding of the condensation pipeline and the condensation plate in this application;

[0024] Figure 5 is the structural schematic diagram of the condenser in this application Figure 1 ;

[0025] Figure 6 is the structural schematic diagram of the condenser in this application Figure 2 ;

[0026] In the figure: 101, fin module; 102, condensation pipeline; 103, condensation plate; 201, fin module; 202, condensation pipeline; 203, condensation plate; 401, pressurizing equipment; 402, tooling; 403, heater; 2021, condensation pipeline inlet; 2022, condensation pipeline outlet; 404, fin. Specific implementation manners

[0027] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0028] The following illustrates the implementation manners of the present application through specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0029] It should be noted that the following describes various aspects of the embodiments within the scope of the appended claims. It should be obvious that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is illustrative only. Based on the present application, those skilled in the art should understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects described herein can be used to implement the device and / or practice the method. In addition, this device can be implemented and this method can be practiced using other structures and / or functions in addition to one or more of the aspects described herein.

[0030] It should also be noted that the illustrations provided in the following embodiments only schematically illustrate the basic concept of the present application. The diagrams only show the components related to the present application, rather than being drawn according to the number, shape and size of the components in actual implementation. The type, quantity and proportion of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0031] In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the examples can be practiced without these specific details.

[0032] As Figure 1 shown, in the existing process for preparing a condenser, first, a groove is cut at the central cross-section of the fin module 101, then the condensation pipeline 102 is embedded into the groove, and then the condensation pipeline 102 is connected to the groove in the fin module 101 by means of flame brazing or vacuum brazing. Finally, the fin module 101 is fixed on the condensation plate 103.

[0033] For example: Patent CN103639559A, a high-performance condenser of a loop heat pipe and its preparation method:

[0034] 1. Process a groove at the center of the fin cross-section;

[0035] 2. Embed the pipeline into the groove, and tap the edge of the groove to deform it so that the groove can hold the pipeline;

[0036] 3. Preheat and heat the fin;

[0037] 4. Coat the groove and the condensation pipeline with a cesium fluoroaluminate suspension and perform flame brazing with aluminum-zinc alloy as the filler metal at 400°C / weld the groove and the condensation pipeline using vacuum brazing;

[0038] 5. Use a machining center to remove the excess fin material;

[0039] 6. Bend and shape the condensation pipeline;

[0040] 7. Connect the fin and the aluminum alloy plate together.

[0041] Such a process method not only requires relatively complex conditions and materials during brazing, but also the degree of fit between the pipeline and the condensation plate after preparation is not high enough, there is a certain contact thermal resistance, resulting in a reduction in the heat conduction ability between the two, thus affecting the overall heat dissipation ability of the condenser.

[0042] In view of this, through research and improvement exploration, the inventor found that: in the existing preparation method process, the condensation pipeline 102 is first welded into the channel of the fin module 101, and then a machining center is used to cut the redundant fins, and the fin module 101 including the condensation pipeline 102 is bent and shaped. In this way, it is easy to damage the condensation pipeline 102 when cutting the fins. In addition, when bending and shaping the fin module 101 that has been welded to the condensation pipeline 102, it is even easier to damage the welded connection between the condensation pipeline 102 and the fin module 101. Since a heat affected zone is generated during the welding process, it causes the material grains to coarsen, residual stress to concentrate, and even brittle hard tissues (such as martensite) to be generated, thereby changing the mechanical properties of the material in this area. At this time, when bending, cracks are likely to appear in the heat affected zone, especially near the weld; moreover, due to the influence of residual stress, new plastic deformation stress will be introduced during bending, and the superposition of the two is likely to cause uncontrollable deformation, making the shape of the workpiece deviate from the expectation.

[0043] In the improvement of the preparation method, it is further found that: the existing condenser preparation methods usually use vacuum brazing or flame brazing to connect the condensation pipeline and the condenser. However, both of these welding methods have certain limitations. For example, for vacuum brazing, not only is the cost relatively high, but also a special equipment, a vacuum brazing furnace, is required for welding, and the process is complex, which is not conducive to mass production. In addition, the high temperature conditions required for vacuum brazing (600 - 1400 °C) are close to the melting point of aluminum alloy, which will damage the strength of the welded parts; for example, for flame brazing, although the temperature conditions are relatively lower than those of vacuum brazing (400 - 480 °C), the process flow is relatively complex, and an aluminum-zinc alloy is used as the filler metal, increasing the number of dissimilar metals. Therefore, more problems such as the melting point difference of dissimilar materials, the mismatch of thermal expansion coefficients, and the chemical composition difference need to be considered during the welding process, thereby increasing the welding difficulty.

[0044] Based on this, the embodiments of this specification propose a preparation method for a loop heat pipe condenser: as Figure 2 shown, the overall idea is: first, a groove is opened on one side surface of the condensation plate 203, then the condensation pipeline 202 is buried into the groove and welded, and then the fin module 201 is covered on the condensation pipeline and connected to the condensation plate 203 by riveting, so that the condensation pipeline 202 is in direct contact with the condensation plate 203, reducing the thermal resistance of heat conduction between the condensation pipeline 202 and the condensation plate 203, and making the heat of the condensation pipeline 202 more easily conducted to the condensation plate 203.

[0045] The following will describe the technical solutions provided by the embodiments of this application with reference to the accompanying drawings.

[0046] As Figure 3 shown, the embodiments of this specification provide a preparation method for a loop heat pipe condenser, including:

[0047] Step S1: Open a channel on one side surface of the condensation plate 203; wherein, the path of the channel is set according to the preset length and shape of the condensation pipeline.

[0048] In implementation, first, groove the one side surface of the condensation plate 203, and the grooving path can be changed according to the requirement of the pipeline length.

[0049] For example, as Figure 5 shown, the size of the condensation pipeline 202 is an outer diameter of 3 mm and an inner diameter of 2 mm, and the size of the condensation plate 203 is 1.5 m in length, 1 m in width, and 3 mm in thickness. The path of the condensation pipeline can be designed with 3 bends, and the rest are straight sections.

[0050] For example, as Figure 6 shown, the size of the condensation pipeline 202 is an outer diameter of 3 mm and an inner diameter of 2 mm, and the size of the condensation plate 203 is 3 m in length, 1.5 m in width, and 3 mm in thickness. The path of the condensation pipeline can be designed with 11 bends, and the rest are straight sections.

[0051] In implementation, the size of the condensation plate can be changed and designed according to specific heat dissipation requirements.

[0052] Step S2: Bend and shape the condensation pipeline 202 according to the path of the channel, and embed the shaped condensation pipeline 202 into the channel.

[0053] In implementation, bend and shape the condensation pipeline 202 according to the selected channel path, and embed the condensation pipeline 202 into the channel.

[0054] Step S3: Brazing-connect the condensation pipeline 202 and the channel so that the condensation pipeline 202 and the channel are connected as a whole.

[0055] Step S4: Cut the fin module 201 so that the fin module 201 matches the condensation pipeline 202, improving the heat dissipation efficiency of the condenser and ensuring the stability and reliability of the overall structure.

[0056] In implementation, after the welding treatment is completed, cut the redundant fins at the position of the fin module 201 corresponding to the condensation pipeline 202 to ensure that the shape and position of the fin module 201 and the condensation pipeline 202 are precisely matched, thereby optimizing the heat dissipation performance and structural integrity of the condenser.

[0057] Specifically, cut off the redundant fins covering the bent pipe section of the condensation pipeline 202 to adapt to the bending shape of the condensation pipeline 202, thereby preventing gaps from appearing between the fins and the condensation pipeline at the bent pipe section, improving the heat conduction efficiency. At the same time, the fins at the straight pipe section are retained, which can maximize the heat dissipation area and further improve the heat dissipation efficiency of the condenser.

[0058] For example, as Figure 5 shown, there are 3 bends in the path design of the condensation pipeline 202. At these bend positions, the fin module needs to be cut to remove the redundant fins, while the fins are retained at the remaining straight pipe sections to ensure the maximum heat dissipation efficiency.

[0059] For example, as Figure 6 shown, the path design of the condensation pipeline 202 is more complex, with 11 bends. At these bend positions, the fin module also needs to be cut to remove the redundant fins, while the fins are retained at the remaining straight pipe sections to optimize the heat dissipation performance of the condenser.

[0060] Step S5: Cover the fin module 201 above the condensation pipeline 202, and fix the fin module 201 on the surface of the condensation plate by riveting. Finally, the style of the condenser is as Figure 5 or as Figure 6 shown. The superheated steam enters the condenser from the condensation pipeline inlet 2021, is then cooled to a liquid and flows out through the condensation pipeline outlet 2022. The condensation pipeline 202 is embedded in the groove on the condensation plate 203, and there is a fin module 201 (fins 404) covering the condensation pipeline 202.

[0061] In this application, the materials selected for the fin module 201 and the condensation plate 203 are both aluminum alloy, and the material selected for the condensation pipeline 202 is 316L stainless steel.

[0062] In one embodiment, the brazing connection of the condensation pipeline and the groove includes:

[0063] Perform surface treatment on the welding surfaces of the condensation pipeline and the groove;

[0064] Perform nickel plating treatment on the welding surfaces of the condensation pipeline and the groove;

[0065] Perform tinning treatment on the surface of the nickel plating layer, and use a tin-based filler metal with a melting point between 227 - 232 °C;

[0066] Use the tooling 402 to fix the condensation pipeline in the groove, so that a part of the condensation pipeline is embedded in the groove and the other part is exposed to increase the heat transfer area;

[0067] Locally heat the welding part to 280 - 300 °C, and apply pressure at the same time until the tin-based filler metal melts and fuses, and then cool and perform post-treatment.

[0068] In practice, as Figure 4As shown, the surfaces to be welded at the channels of the described condensation pipeline 202 (i.e., 316L stainless steel capillary) and the condensation plate 203 (i.e., aluminum alloy plate radiator) are polished to remove impurities such as oxide layers and oil stains;

[0069] Next, bright nickel plating is carried out on the surface to be welded at the groove where the aluminum alloy plate radiator is connected to the 316L stainless steel capillary and the surface to be welded of the stainless steel capillary 303, which can achieve the effects of protecting the base material, anti-corrosion, improving hardness and wear resistance, improving chemical stability and improving welding performance.

[0070] Then, tinning treatment is carried out on the nickel plating surface at the groove where the aluminum alloy plate radiator is connected to the 316L stainless steel capillary and the nickel plating surface of the stainless steel capillary 303. Tin-based brazing filler metal with a melting point between 227 - 232 °C is used, which meets the temperature requirements of this brazing method.

[0071] Then, a specific tooling 402 is used to fix and restrain the connection between the groove of the aluminum alloy plate radiator and the 316L stainless steel capillary. The condensation pipeline 202 is fixed in the channel of the condensation plate 203. Half of the surface of the condensation pipeline 202 is exposed, and the other half is embedded in the groove, so that the workpieces to be welded can be in full contact, increasing the heat exchange area and improving the thermal conductivity.

[0072] It should be noted that there are no special requirements for the tooling 402, as long as it can fix the condensation pipeline in the channel. It can be a stainless steel fixture, and the contact surface matches the shape of the capillary and the groove.

[0073] Finally, a specific heater 403 is used. Without completely covering the welding point between the radiator 304 and the pipeline, local heating of the workpieces to be welded can be carried out, which is more flexible in operation and there is no need to worry about the problem of too large workpiece size. The heater 403 heats the surface to be welded that has been completed with restraint to 280 - 300 °C. During the heating process, a pressurizing device 401 is used to apply pressure to ensure close contact between the condensation pipeline and the channel until the tin-based brazing filler metal melts and fills the weld. After the tin-based brazing filler metal melts and fuses, heating is stopped, and the workpiece is allowed to cool naturally or at a controlled rate to room temperature, and then post-treatment is carried out, so as to ensure that the brazing connection between the condensation pipeline and the channel is both firm and has good heat conduction performance, improving the overall performance and reliability of the condenser.

[0074] In one embodiment, the surface treatment includes:

[0075] Polishing the surface to be welded to make the surface of the surface to be welded reach a preset roughness;

[0076] Using acetone ultrasonic cleaning for 5 - 15 minutes or alcohol ultrasonic cleaning for 5 minutes on the surface to be welded.

[0077] During implementation, the preset roughness is Ra≤2.0 μm. Specifically, the surface to be welded is polished to a surface roughness of Ra≤2.0 μm, and the workpiece to be welded is first ultrasonically cleaned with acetone for 5 - 15 minutes, and then ultrasonically cleaned with alcohol for 5 minutes.

[0078] In one embodiment, before locally heating the welding part, preset treatment is performed on the welding part, including:

[0079] The temperature is raised to 280 - 300 °C at a rate of 5 °C per minute, and preheating and heat preservation are carried out for 10 minutes.

[0080] During implementation, preheating and heat preservation of the workpiece is an effective measure to prevent cold cracks, hot cracks and the appearance of hardened structures in the heat - affected zone. When welding the welded joint, due to rapid cooling and heating, shrinkage stress will be generated in the end area, thus causing cracks. Preheating can reduce the shrinkage stress and prevent the generation of cracks. Moreover, preheating can also remove residual oil, moisture and other factors that affect the weld quality, and can also promote the escape of hydrogen in the weld, thus preventing defects such as porosity or cracks.

[0081] In one embodiment, under the heat - preservation state, pressure is applied to the condensation pipeline and the condensation pipe and maintained for 10 - 40 minutes. After the tin - based brazing filler metal is completely melted and fused, heating is stopped, and then it is cooled to room temperature at a rate of 10 °C per minute.

[0082] Combined with the above - mentioned embodiments, during the whole process, the condition of the workpiece is observed. It can be in the preheating and heat - preservation stage, or after the preheating is completed. Using a pressurizing device to apply pressure to the condensation pipeline and the channel to ensure close contact between the condensation pipeline and the channel. The brazing heat - preservation time is controlled within 10 - 40 minutes to ensure that the tin - based brazing filler metal can be completely melted and evenly fill the weld. When the tin brazing filler metal is completely melted and fused, heating is stopped, and then the workpiece is cooled at a rate of 10 °C per minute until the temperature of the workpiece cools to room temperature.

[0083] In one embodiment, the post - treatment includes:

[0084] After removing the tooling, surface treatment is performed on the welding part, including: grinding, removing residues and cleaning.

[0085] In one embodiment, the cross - sectional shape of the channel is semi - circular, and the size matches the outer diameter of the condensation pipeline.

[0086] For example, if the size of the condensation pipeline 202 is an outer diameter of 3 mm and an inner diameter of 2 mm, the cross - section of the channel can be designed as a semi - circular shape, and the radius of the semi - circle is 3 mm to adapt to the outer - diameter size of the condensation pipeline, so as to ensure close fit between the condensation pipeline and the channel, and improve the structural stability and heat - conduction efficiency.

[0087] A method for preparing a loop heat pipe condenser provided by this application has advantages in terms of low cost, high efficiency and convenience, excellent performance, etc.

[0088] Based on the same inventive concept, the present invention also provides a loop heat pipe condenser prepared by using the method for preparing a loop heat pipe condenser described in this application. The loop heat pipe condenser includes: a condensation plate, a condensation pipeline and a fin module;

[0089] On one side surface of the condensation plate, a channel for pre-burying the condensation pipeline is provided; wherein, the path of the channel is set according to the preset length and shape of the condensation pipeline;

[0090] The condensation pipeline is bent and shaped according to the path of the channel, and is welded to the channel by brazing;

[0091] The fin module covers above the condensation pipeline and is fixed on the surface of the condensation plate by riveting.

[0092] In an embodiment, the materials of the condensation plate and the fin module are aluminum alloy, and the material of the condensation pipeline is 316L stainless steel.

[0093] In an embodiment, the outer diameter of the condensation pipeline is 3 mm, the inner diameter is 2 mm, and the cross-sectional shape of the channel is a semi-circle with a radius of 3 mm, which matches the outer diameter of the condensation pipeline.

[0094] In this condenser, the materials selected for the condensation plate and the condensation pipeline are aluminum alloy and 316L stainless steel respectively. Among them, stainless steel is prone to a decrease in corrosion resistance due to carbide precipitation after welding, and the surface needs to be avoided from being scratched during bending. While the heat-affected zone of aluminum alloy softens significantly, and the deformation amount needs to be controlled especially during bending to prevent local tearing. Therefore, this preparation process is superior to the existing preparation processes.

[0095] The present invention adopts the method of low-temperature welding, and the temperature requirement is only between 280 - 300 °C, which is far lower than the melting points of stainless steel and aluminum alloy, and adopts the method of preheating and heat preservation to reduce the heat influence, and better solves the problem of mismatched thermal expansion coefficients; and the lower temperature can not only generate lower thermal stress, reduce the damage to the strength of the workpiece to be welded, but also slow down or even inhibit chemical reactions. It not only reduces the process production cost of condenser preparation, reduces the operation difficulty, does not require the use of a vacuum brazing furnace, the equipment used is simple, but also can perfectly solve the problems that need to be noted in the welding of these two metals, 316L stainless steel and aluminum alloy.

[0096] In this specification, the same or similar parts among the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments. In particular, for the embodiments described later, the description is relatively simple, and the relevant parts can be referred to the partial descriptions of the foregoing embodiments.

[0097] As described above, the foregoing are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A preparation method of a loop heat pipe condenser, characterized in that, Including: A channel is opened on one surface of the condensation plate; wherein, the path of the channel is set according to the preset length and shape of the condensation pipeline; The condensation pipeline is bent and shaped according to the path of the channel, and the shaped condensation pipeline is embedded into the channel; The condensation pipeline is brazed to the channel so that the condensation pipeline and the channel are connected as a whole; The fin module is cut to match the condensation pipeline; The fin module is covered above the condensation pipeline, and the fin module is fixed on the surface of the condensation plate by riveting; 2. The preparation method of the loop heat pipe condenser according to claim 1, characterized in that, The brazing connection of the condensation pipeline to the channel includes: Surface treatment is performed on the welding surface of the condensation pipeline and the welding surface of the channel; Nickel plating treatment is performed on the welding surface of the condensation pipeline and the welding surface of the channel; Tin plating treatment is performed on the surface of the nickel plating layer, and a tin-based brazing filler metal with a melting point between 227 - 232 °C is used; A tooling is used to fix the condensation pipeline in the channel so that a part of the condensation pipeline is embedded in the groove and the other part is exposed to increase the heat exchange area; The welding part is locally heated to 280 - 300 °C, and pressure is applied simultaneously until the tin-based brazing filler metal melts and fuses, and then it is cooled and post-treated; 3. The method for preparing a loop heat pipe condenser according to claim 2, wherein The surface treatment includes: The welding surface is polished so that the surface of the welding surface reaches a preset roughness; The welding surface is ultrasonically cleaned with acetone for 5 - 15 minutes, or ultrasonically cleaned with alcohol for 5 minutes; 4. The method for preparing a loop heat pipe condenser according to claim 2, wherein, Before locally heating the welding part, preset treatment is performed on the welding part, including: Heating up to 280 - 300 °C at a rate of 5 °C per minute and preheating and maintaining for 10 minutes; 5. The method for manufacturing a loop heat pipe condenser according to claim 4, wherein Under the insulation state, pressure is applied to the condensation pipeline and the condensation pipeline, and it is maintained for 10 - 40 minutes. After the tin-based brazing filler metal completely melts and fuses, heating is stopped, and then it is cooled to room temperature at a rate of 10 °C per minute; 6. The preparation method of the loop heat pipe condenser according to claim 2, wherein, The post-treatment includes: After removing the tooling, surface treatment is performed on the welding part, including: polishing, removing residues, and cleaning; 7. The method for preparing a loop heat pipe condenser according to claim 1, wherein The cross-sectional shape of the channel is semi-circular, and the size matches the outer diameter of the condensation pipeline; 8. A loop heat pipe condenser, characterized in that, Prepared by using the preparation method of the loop heat pipe condenser described in claims 1 - 7, the loop heat pipe condenser includes: a condensation plate, a condensation pipeline, and a fin module; The condensation plate has a channel for embedding the condensation pipeline opened on one surface; wherein, the path of the channel is set according to the preset length and shape of the condensation pipeline; The condensation pipeline is bent and shaped according to the path of the channel and is welded to the channel by brazing; The fin module covers above the condensation pipeline and is fixed on the surface of the condensation plate by riveting; 9. The loop heat pipe condenser according to claim 8, characterized in that, The materials of the condensation plate and the fin module are aluminum alloy, and the material of the condensation pipeline is 316L stainless steel; 10. The loop heat pipe condenser according to claim 8, wherein, The outer diameter of the condensation pipeline is 3 mm, the inner diameter is 2 mm, and the cross-sectional shape of the channel is a semi-circle with a radius of 3 mm, which matches the outer diameter of the condensation pipeline.

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