Green manufacturing method for high-efficiency long heat pipe for ultra-high flow rate applications, and high-efficiency long heat pipe

Abstract

A green manufacturing method for a high-efficiency long heat pipe for ultra-high flow rate applications, and a high-efficiency long heat pipe. The green manufacturing method comprises pretreatment (S1), enhancement treatment (S2), assembly (S3), chemical treatment (S4), and working fluid filling and vacuum creation (S5). The assembly involves sleeving an outer tube onto an inner tube, arranging sleeve flexible support legs between the inner tube and the outer tube, and arranging an auxiliary tube on each of both end caps of the outer tube, wherein the auxiliary tubes are communicated with a heat exchange cavity between an outer wall of the inner tube and an inner wall of the outer tube. The chemical treatment involves sequentially connecting a plurality of heat pipe bodies by means of auxiliary tubes, and introducing a chemical agent into a heat exchange cavity of a first heat pipe body by using the corresponding auxiliary tube, wherein the chemical agent can be circulated for reuse within heat exchange cavities of the plurality of connected heat pipe bodies. The working fluid filling and vacuum creation involve filling a heat exchange cavity with a working fluid by means of two auxiliary tubes or evacuating, by means of the two auxiliary tubes, the heat exchange cavity to create a vacuum.

Description

Green manufacturing method of high-efficiency long heat pipe for super large flow and high-efficiency long heat pipe

[0001] This application claims priority to the Chinese patent application No. 202411354837.6 filed on September 27, 2024 with the Chinese Patent Office, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of heat pipe, for example, to a green manufacturing method of high-efficiency long heat pipe for super large flow and high-efficiency long heat pipe. BACKGROUND

[0003] In order to reduce the exhaust gas temperature, reduce the exhaust loss, improve the thermal efficiency of the device, and ensure the safe and stable operation of the heat exchange device, the radial heat pipe of the heat pipe low-temperature economizer currently used has a length of only 3-5 meters due to structural constraints and other reasons, which cannot meet the needs of large-scale and high-flow equipment, and the manufacturing process also has problems such as high energy consumption and wastewater discharge, which cannot meet the increasingly stringent energy saving and emission reduction indicators. In addition, for the expansion problem of the super-long heat pipe, although expansion joints and other structures can be set to solve the problem, it will cause the heat pipe structure to be complex and difficult to use for a long time. SUMMARY

[0004] The present application provides a green manufacturing method of high-efficiency long heat pipe for super large flow, which not only meets the structural strength requirements of high-efficiency long heat pipe and the high-efficiency heat exchange needs of super large flow fluid, but also is environmentally friendly in the manufacturing process.

[0005] The present application provides a green manufacturing method of high-efficiency long heat pipe for super large flow, which includes:

[0006] Pre-treatment: manufacturing the inner tube and the outer tube according to the designed size of the inner tube and the outer tube, and performing decontamination and rust removal treatment on the surface of the inner tube and the outer tube;

[0007] Strengthening treatment: setting a heat transfer structure on at least one of the inner wall and the outer wall of the inner tube, and performing annealing treatment on the inner tube; setting a fin structure on the outer wall of the outer tube;

[0008] Assembly: sleeving the outer tube on the inner tube, setting a sleeve flexible leg between the inner tube and the outer tube, the sleeve part of the sleeve flexible leg being in interference fit with the outer wall of the inner tube, and the leg part of the sleeve flexible leg abutting against the inner wall of the outer tube; welding end covers at both ends of the outer tube, the both ends of the inner tube extending out of the outer tube through the end covers to form a heat pipe body, and a heat exchange cavity being formed between the outer wall of the inner tube and the inner wall of the outer tube; setting auxiliary pipes on both of the end covers, the auxiliary pipes being in communication with the heat exchange cavity;

[0009] Chemical treatment: a plurality of said heat pipe bodies are connected in sequence through said auxiliary pipes, a chemical agent is introduced into the heat exchange cavity of the first said heat pipe body through said auxiliary pipes, and the chemical agent is used to circulate in the heat exchange cavities of a plurality of said heat pipe bodies;

[0010] Filling working medium and vacuuming: the heat exchange cavities are vacuumed through two said auxiliary pipes, after a predetermined vacuum degree is reached in the heat exchange cavities, working medium is filled into the heat exchange cavities through two said auxiliary pipes, and after a predetermined amount of working medium is filled in the heat exchange cavities, two said auxiliary pipes are blocked to seal the heat exchange cavities to form a high-efficiency long heat pipe; or,

[0011] Filling working medium into the heat exchange cavities through two said auxiliary pipes, after a predetermined amount of working medium is filled in the heat exchange cavities, one said auxiliary pipe is blocked, and the other said auxiliary pipe is used to exhaust to reach a predetermined vacuum degree in the heat exchange cavities, and then the other said auxiliary pipe is blocked to seal the heat exchange cavities to form a high-efficiency long heat pipe.

[0012] In some embodiments, in the chemical treatment, the heat pipe body is rotated to make the chemical agent flow through the inner wall of the heat exchange cavity.

[0013] In some embodiments, the number of cycles of the chemical treatment is 1 to 5, the total treatment time is 5 minutes to 30 minutes, and after the chemical treatment, the heat exchange cavity is flushed with clean water.

[0014] In some embodiments, in the chemical treatment, one of the two said auxiliary pipes is a liquid inlet pipe and the other is a liquid outlet pipe, a plurality of said heat pipe bodies are connected in sequence, and the liquid outlet pipe of the last said heat pipe body is connected to the liquid inlet pipe of the first said heat pipe body through a second hose, and a chemical agent pump is arranged on the second hose.

[0015] In some embodiments, a chemical agent storage tank is further arranged on the second hose, and the chemical agent storage tank is arranged to store a chemical agent.

[0016] In some embodiments, in the assembly, at least one said sleeve flexible leg is arranged.

[0017] When a plurality of said sleeve flexible legs are arranged, a plurality of said sleeve flexible legs are arranged on the inner pipe in the axial direction of the inner pipe, and the distance between adjacent two said sleeve flexible legs is L1, 1.5 meters ≤ L1 ≤ 2.5 meters.

[0018] In some embodiments, in the assembling, the sleeve flexible leg comprises a sleeve part and a leg part, the leg part comprises a plurality of flexible legs, the plurality of flexible legs are arranged on the sleeve part in a circumferential direction of the sleeve part, and a length of the sleeve part in an axial direction of the inner tube is L2, 15mm≤L2≤30mm.

[0019] In some embodiments, the flexible leg is a straight leg or a corrugated leg.

[0020] In some embodiments, at least one of the two end caps is a curved end cap.

[0021] The application also provides a high-efficiency long heat pipe, which can meet the structural strength requirement of the high-efficiency long heat pipe and the high-efficiency heat exchange requirement of a fluid with super large flow, and has a simple structure.

[0022] Embodiments of the application provide a high-efficiency long heat pipe, which comprises an inner tube, an outer tube, a sleeve flexible leg, and end caps arranged at two ends of the outer tube.

[0023] The outer tube is sleeved outside the inner tube, the sleeve flexible leg is arranged between the inner tube and the outer tube, the two end caps are blocked at two ends of the outer tube, at least one of the two end caps is a curved end cap, and two ends of the inner tube extend out of the outer tube through the end caps. BRIEF DESCRIPTION OF DRAWINGS

[0024] FIG. 1 is a flowchart of a green manufacturing method of a high-efficiency long heat pipe for super large flow provided by embodiments of the application;

[0025] FIG. 2 is a schematic diagram of a chemical treatment of a heat pipe body provided by embodiments of the application;

[0026] FIG. 3 is a partial cross-sectional view of the high-efficiency long heat pipe from a first perspective provided by embodiments of the application;

[0027] FIG. 4 is a partial cross-sectional view of the high-efficiency long heat pipe without a sleeve flexible leg from a second perspective provided by embodiments of the application;

[0028] FIG. 5 is a partial cross-sectional view of the high-efficiency long heat pipe comprising a straight leg from a second perspective provided by embodiments of the application;

[0029] FIG. 6 is a partial cross-sectional view of the high-efficiency long heat pipe comprising a corrugated leg from a second perspective provided by embodiments of the application;

[0030] FIG. 7 is a partial cross-sectional view of the inner tube provided by embodiments of the application.

[0031] In the drawings:

[0032] 10, high-efficiency long heat pipe; 20, heat exchange cavity;

[0033] 1, inner tube; 2, outer tube; 3, end cap; 4, sleeve flexible leg; 41, sleeve portion; 42, leg portion; 421, straight leg; 422, corrugated leg;

[0034] 101, inner heat transfer structure; 102, outer heat transfer structure; 103, fin structure;

[0035] 201, auxiliary tube; 202, first hose; 203, second hose; 204, medicament pump; 205, medicament storage tank. DETAILED DESCRIPTION

[0036] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the meaning of the above terms in the present application can be understood as appropriate.

[0037] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first feature and the second feature are in direct contact, or that the first feature and the second feature are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or indicates that the first feature is higher in horizontal height than the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or indicates that the first feature is lower in horizontal height than the second feature.

[0038] In the description of the present embodiment, the terms "up", "down", "left", "right" and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0039] The technical solutions of the present application will be described below in conjunction with the drawings and through specific embodiments.

[0040] As shown in FIGS. 1-7, the present embodiment provides a green manufacturing method for a high-efficiency long heat pipe for super large flow, comprising the following steps S1-S5: pretreatment, strengthening treatment, assembly, chemical treatment, and charging working medium and vacuuming.

[0041] S1, pretreatment, i.e. manufacturing the inner tube 1 and the outer tube 2 according to the design size of the inner tube 1 and the outer tube 2, and carrying out decontamination and rust removal treatment on the surface of the inner tube 1 and the outer tube 2.

[0042] S2, strengthening treatment, i.e. setting a heat transfer structure on at least one of the inner wall and the outer wall of the inner tube 1 to strengthen the heat transfer effect of the inner tube 1, and carrying out annealing treatment on the inner tube 1 to eliminate the residual stress of the inner tube 1 and improve the mechanical properties of the inner tube 1. A fin structure 103 is set on the outer wall of the outer tube 2 to strengthen the heat transfer effect of the outer tube 2.

[0043] S3, assembly, i.e. sleeving the sleeve flexible leg 4 on the inner tube 1, the sleeve part 41 of the sleeve flexible leg 4 is in interference fit with the outer wall of the inner tube 1, and the outer tube 2 is sleeved on the inner tube 1, so that the leg part 42 of the sleeve flexible leg 4 abuts against the inner wall of the outer tube 2, and the sleeve flexible leg 4 is clamped between the outer wall of the inner tube 1 and the inner wall of the outer tube 2, which not only fixes the relative position of the inner tube 1 and the outer tube 2, but also absorbs the expansion amount of the inner tube 1, thereby ensuring the performance of the high-efficiency long heat pipe 10. The sleeve flexible leg 4 and the inner tube 1 are fixed by interference fit instead of welding, which not only simplifies the assembly process of the sleeve flexible leg 4 and the inner tube 1, but also does not hinder the setting of the outer heat transfer structure 102 on the outer wall of the inner tube 1, even if the sleeve flexible leg 4 is fixed at the outer heat transfer structure 102, it will not affect the connection stability of the sleeve flexible leg 4 and the inner tube 1. In addition, the assembly step further includes welding the end cover 3 at both ends of the outer tube 2, the two ends of the inner tube 1 protrude out of the outer tube 2 through the end cover 3 to form a heat pipe body, and a heat exchange cavity 20 is formed between the outer wall of the inner tube 1 and the inner wall of the outer tube 2. The assembly step further includes setting an auxiliary pipe 201 on each of the two end covers 3, and the auxiliary pipe 201 communicates with the heat exchange cavity 20. The end cover 3 is reserved with an auxiliary hole, the auxiliary pipe 201 is arranged in the auxiliary hole and is welded with the end cover 3, and the material of the auxiliary pipe 201 can be 304 stainless steel.

[0044] S4, chemical treatment, that is, connecting the plurality of heat pipe bodies in sequence through the auxiliary pipe 201, and introducing the chemical agent into the heat exchange cavity 20 of the first heat pipe body by using the auxiliary pipe 201, and in the case that the heat exchange cavities 20 of the plurality of heat pipe bodies are communicated through the auxiliary pipe 201, the chemical agent can circulate in the heat exchange cavities 20 of the connected plurality of heat pipe bodies. Compared with the related art, the heat pipe bodies are placed in the chemical agent tank in the open environment for chemical treatment, the heat pipe bodies are connected end to end in the present application, and the chemical agent is introduced into the heat exchange cavity 20 of the heat pipe body, which not only can avoid the pollution of the chemical agent in the open environment to the environment and the damage to the human body, but also can reduce the amount of chemical agent by recycling the chemical agent, so as to realize energy saving and environmental protection in the chemical treatment process. In this embodiment, the chemical agent used in the chemical treatment step can be the chemical agent used in the traditional chemical treatment. The chemical agent of the present embodiment includes acidic agent, alkaline agent and high oxidizing agent, and when the chemical treatment is carried out, the acidic agent, the alkaline agent and the high oxidizing agent need to be introduced into the heat exchange cavity 20 respectively, and a water flushing step is added between each link to prevent different types of chemical agents from mixing in the heat exchange cavity 20.

[0045] S5, filling working medium and vacuumizing, that is, after the chemical treatment is completed, the heat exchange cavity 20 can be vacuumized through the two auxiliary pipes 201, and after the heat exchange cavity 20 reaches a predetermined vacuum degree, the working medium is filled into the heat exchange cavity 20 through the two auxiliary pipes 201, and after a predetermined amount of working medium is filled into the heat exchange cavity 20, the two auxiliary pipes 201 are sealed to seal the heat exchange cavity 20 to form the high-efficiency long heat pipe 10; or, the working medium is filled into the heat exchange cavity 20 through the two auxiliary pipes 201, one auxiliary pipe 201 is sealed after a predetermined amount of working medium is filled into the heat exchange cavity 20, and the other auxiliary pipe 201 is used to exhaust the gas in the heat exchange cavity 20 to make the heat exchange cavity 20 reach a predetermined vacuum degree, and then the other auxiliary pipe 201 is sealed to seal the heat exchange cavity 20 to form the high-efficiency long heat pipe 10. Exemplarily, the gas in the heat exchange cavity 20 can be exhausted through the other auxiliary pipe 201 by heating the heat exchange cavity 20, so that the heat exchange cavity 20 reaches a predetermined vacuum degree.

[0046] In some embodiments, the high-efficiency long heat pipe 10 also needs to be subjected to water bath performance test before leaving the factory to detect whether the high-efficiency long heat pipe 10 meets the manufacturing standard requirements, and the high-efficiency long heat pipe 10 that passes the test can be packaged by using a frame and the like, and the fin structure 103 is corrected.

[0047] The green manufacturing method for the high-efficiency long heat pipe for super large flow provided in the present embodiment can realize the manufacturing of the high-efficiency long heat pipe 10, the length of the high-efficiency long heat pipe 10 can reach 15 meters, and the high-efficiency long heat pipe 10 is suitable for the environment with super large flue gas flow (the flue gas flow can reach 1000000 standard cubic meters per hour (Nm 3 / h)~3000000 standard cubic meters per hour (Nm3 The heat transfer structure arranged on the inner tube 1 and the fin structure 103 arranged on the outer tube 2 can ensure the heat exchange efficiency of the high-efficiency long heat pipe 10. By arranging the sleeve flexible leg 4 to absorb the expansion amount of the inner tube 1, the vibration and other problems of the high-efficiency long heat pipe 10 can be alleviated, and the risk of cracking and failure of the high-efficiency long heat pipe 10 caused by the stress that cannot be released due to the ordinary welded leg can be avoided, while mechanical support can be provided to ensure the structural strength requirement of the high-efficiency long heat pipe 10. In addition, the closed and circulating chemical treatment during the manufacturing process can achieve environmental protection and energy saving during the manufacturing process. Compared with the traditional chemical treatment method of placing the heat pipe body in a chemical tank, the circulating chemical treatment method of the present embodiment can also eliminate the requirement for the size of the chemical tank when the length of the heat pipe body is long, thereby reducing the cost. In addition, during the steps of charging the working medium and vacuumizing, the two auxiliary pipes 201 arranged on the two end covers 3 can improve the efficiency of charging the working medium and vacuumizing, thereby improving the production efficiency.

[0048] In some embodiments, in the pretreatment step, the inner tube 1 and the outer tube 2 can be made of steel pipes, that is, the steel pipes are cut and processed according to the design size of the inner tube 1 and the outer tube 2. The steel pipes need to be straightened before cutting and processing, and the straightness tolerance needs to be less than 1 millimeter per meter (mm / m). The ends of the cut steel pipes need to be beveled to make the perpendicularity deviation of the end surface of the inner tube 1 and the outer tube 2 to the axis of the inner tube 1 and the outer tube 2 within ±0.5 millimeters. In addition, the rust, oxide scale and oil stains on the surface of the inner tube 1 and the outer tube 2 are removed by mechanical and chemical methods in the related art, and the dust and gas generated in the processing workshop are discharged after treatment.

[0049] In some embodiments, in the strengthening treatment step, the heat transfer structure includes an inner heat transfer structure 101 and an outer heat transfer structure 102, wherein the inner heat transfer structure 101 is arranged on the inner wall of the inner tube 1, and the outer heat transfer structure 102 is arranged on the outer wall of the inner tube 1. The inner heat transfer structure 101 and the outer heat transfer structure 102 can be an inner wave and outer thread structure, that is, a wave is arranged on the inner wall of the inner tube 1 to make the inner wall of the inner tube 1 have an inner channel, and a thread is arranged on the outer wall of the inner tube 1 to make the outer wall of the inner tube 1 have an outer channel. In addition, the fin structure 103 can be an H-shaped, nail head-shaped, radial-shaped or other structure, and the fin structure 103 can increase the heat dissipation area of the outer tube 2 to strengthen the heat transfer effect of the outer tube 2. The fusion degree of the fin structure 103 and the outer tube 2 is ≥98%, and the pull-off strength is ≥196 megapascals (MPa), so as to ensure the connection stability of the fin structure 103 and the outer tube 2.

[0050] In some embodiments, the heat pipe bodies can be rotated during the chemical treatment step to enable the chemical agent to flow through the inner wall of the heat exchange cavity 20 everywhere, so that the chemical agent can fully act in the heat exchange cavity 20, and ensure the effect of the chemical treatment of the inner wall of the heat exchange cavity 20.

[0051] Optionally, the number of cycles of the chemical treatment is 3 to 5 times, and the total treatment time is 5 to 30 minutes during the chemical treatment step. After the chemical treatment step, the heat exchange cavity 20 needs to be flushed with clean water, that is, the clean water is also introduced into the heat exchange cavity 20 through the auxiliary pipe 201, and the flow path of the clean water in the heat exchange cavity 20 of each heat pipe body is consistent with that of the chemical agent.

[0052] As shown in FIG. 2, during the chemical treatment step, the two auxiliary pipes 201 on each heat pipe body are used as a liquid inlet pipe and a liquid outlet pipe, respectively. The multiple heat pipe bodies are connected in sequence, and the liquid outlet pipe of the previous heat pipe body is connected to the liquid inlet pipe of the next heat pipe body through the first hose 202, and the liquid outlet pipe of the last heat pipe body is connected to the liquid inlet pipe of the first heat pipe body through the second hose 203. In some embodiments, the fluid can enter the heat exchange cavity 20 of the first heat pipe body through the liquid inlet pipe on the first heat pipe body, and then pass through the liquid outlet pipe on the first heat pipe body, the first hose 202, and the liquid inlet pipe on the second heat pipe body to enter the heat exchange cavity 20 of the second heat pipe body, and so on, until it is discharged through the liquid outlet pipe on the last heat pipe body, and then reenters the heat exchange cavity 20 of the first heat pipe body through the second hose 203 and the liquid inlet pipe on the first heat pipe body, and is recycled. The agent pump 204 is arranged on the second hose 203, and is configured to provide power to the fluid flowing through the second hose 203, so that the fluid can circulate in the above-mentioned loop at a predetermined flow rate.

[0053] As shown in FIG. 2, the second hose 203 is also provided with a medicine storage tank 205. That is, after the completion of the chemical treatment step, or after one cycle of chemical treatment, the chemical agent can be temporarily stored in the medicine storage tank 205, and then the agent pump 204 can be started according to the needs or after a predetermined interval, so that the chemical agent can re-enter the heat exchange cavity 20 for circulation.

[0054] In the assembling step, the sleeve flexible leg 4 has at least one, and when the sleeve flexible leg 4 has multiple, the multiple sleeve flexible legs 4 are sleeved on the inner tube 1 in the axial direction of the inner tube 1, and the interval distance between two adjacent sleeve flexible legs 4 is L1, 1.5 meters≤L1≤2.5 meters (L1 shown in FIG. 3). The traditional rigid leg is made of carbon steel or stainless steel, and welding is used to fix the rigid leg with the inner tube 1 and the outer tube 2, and the rigid leg which cannot be welded is also in rigid contact with the inner wall of the outer tube 2. Therefore, the inner wall of the outer tube 2 is easily damaged during the operation of the high-efficiency long heat pipe 10, which affects the performance of the high-efficiency long heat pipe 10. In the embodiment, the sleeve flexible leg 4 can not only meet the expansion needs of the inner tube 1, but also can absorb the displacement of the high-efficiency long heat pipe 10 and the force applied to the leg, so as to avoid damaging the outer wall of the inner tube 1 and the inner wall of the outer tube 2, and eliminate the risk of cracking of the high-efficiency long heat pipe 10.

[0055] Optionally, in the assembling step, the sleeve flexible leg 4 includes a sleeve part 41 and a leg part 42, the leg part 42 includes multiple flexible legs, and the multiple flexible legs are arranged on the sleeve part 41 in the circumferential direction of the sleeve part 41. The length of the sleeve part 41 in the axial direction of the inner tube 1 is L2, 15 millimeters≤L2≤30 millimeters (L2 shown in FIG. 3). In some embodiments, the flexible leg is arranged in the circumferential direction of the sleeve part 41, and at least one flexible leg can be arranged uniformly in the circumferential direction of the inner tube 1. The sleeve flexible leg 4 is in interference fit with the inner tube 1 instead of welding, can position the relative positions of the inner tube 1 and the outer tube 2, and absorb the expansion of the inner tube 1, so as to ensure the performance of the high-efficiency long heat pipe 10. When the length of the sleeve part 41 is 15 millimeters to 30 millimeters, the interference fit between the sleeve part 41 and the inner tube 1 can increase the friction therebetween, prevent the sleeve part 41 from moving in the working state, and the length of the sleeve part 41 is generally greater than the width of the outer groove of the outer heat transfer structure 102, which can effectively prevent the sleeve part 41 from falling into the outer groove, and ensure the stability of the installation of the sleeve flexible leg 4. In the embodiment, the leg part 42 includes three flexible legs, and the three flexible legs are uniformly and spacedly arranged. The included angle between two adjacent flexible legs in the circumferential direction of the inner tube 1 is 120°. Exemplarily, the sleeve flexible leg 4 can be made of ceramic, fluoroplastic or rubber, and different materials can be used according to the use temperature of the high-efficiency long heat pipe 10.

[0056] Optionally, as shown in FIGS. 5 and 6, the flexible leg can be a straight leg 421. The flexible leg can also be a corrugated leg 422. Both the straight leg 421 and the corrugated leg 422 can position the relative positions of the inner tube 1 and the outer tube 2. In some embodiments, the corrugated leg 422 can better absorb the force applied to the leg part 42 by the inner tube 1 and the outer tube 2.

[0057] In some embodiments, the plurality of flexible legs of the leg portion 42 can adopt a hybrid configuration of straight legs 421 and corrugated legs 422, some of which are straight legs 421 and the rest of which are corrugated legs 422.

[0058] Optionally, in the assembling step, at least one of the two end caps 3 is a curved end cap, which can also improve the thermal stress of the high efficiency long heat pipe 10 caused by temperature difference compared with a flat end cap. The curved end cap can be a bowl-shaped end cap, a cap-shaped end cap or an oval end cap, etc. The end caps 3 at both ends of the high efficiency long heat pipe 10 can be both curved end caps, or one flat end cap and one curved end cap. The end caps 3 are welded and fixed to the outer tube 2, and the welding can adopt argon arc welding.

[0059] The embodiment also provides a high efficiency long heat pipe 10 manufactured by the above-mentioned green manufacturing method for high efficiency long heat pipe with super large flow. The high efficiency long heat pipe 10 comprises an inner tube 1, an outer tube 2, sleeve flexible legs 4 and end caps 3. The outer tube 2 is sleeved outside the inner tube 1. The sleeve flexible legs 4 are sleeved on the inner tube 1 with interference and are clamped between the outer wall of the inner tube 1 and the inner wall of the outer tube 2. The end caps 3 are sealed at both ends of the outer tube 2, and the two ends of the inner tube 1 extend out of the outer tube 2 through the end caps 3. The length of the high efficiency long heat pipe 10 manufactured by the above-mentioned green manufacturing method for high efficiency long heat pipe with super large flow can reach 15 m. The expansion problem of the super long heat pipe can be solved by arranging the sleeve flexible legs 4, the structural strength requirement of the high efficiency long heat pipe 10 is guaranteed, and the structure is simple.

Claims

1. A green manufacturing method of a high-efficiency long heat pipe for ultra-large flow, comprising: pretreatment: manufacturing an inner tube (1) and an outer tube (2) according to the design size of the inner tube (1) and the outer tube (2), and performing decontamination and rust removal treatment on the surface of the inner tube (1) and the outer tube (2); strengthening treatment: providing a heat transfer structure on at least one of the inner wall and the outer wall of the inner tube (1), and performing annealing treatment on the inner tube (1); providing a fin structure (103) on the outer wall of the outer tube (2); assembly: sleeving the outer tube (2) on the inner tube (1), providing a sleeve flexible leg (4) between the inner tube (1) and the outer tube (2), the sleeve part (41) of the sleeve flexible leg (4) being in interference fit with the outer wall of the inner tube (1), and the leg part (42) of the sleeve flexible leg (4) abutting against the inner wall of the outer tube (2); welding end covers (3) on both ends of the outer tube (2), the both ends of the inner tube (1) extending out of the outer tube (2) through the end covers (3) to form a heat pipe body, a heat exchange cavity (20) being formed between the outer wall of the inner tube (1) and the inner wall of the outer tube (2); an auxiliary tube (201) being provided on each of the two end covers (3), and the auxiliary tube (201) being in communication with the heat exchange cavity (20); chemical treatment: connecting a plurality of heat pipe bodies in sequence through the auxiliary tubes (201), and introducing a chemical agent into the heat exchange cavity (20) of a first heat pipe body through the auxiliary tubes (201), the chemical agent being used for circulating in the heat exchange cavities (20) of the plurality of heat pipe bodies; charging working medium and vacuumizing: vacuumizing the heat exchange cavities (20) through the two auxiliary tubes (201), after a predetermined vacuum degree is reached in the heat exchange cavities (20), charging working medium into the heat exchange cavities (20) through the two auxiliary tubes (201), and after a predetermined amount of working medium is charged in the heat exchange cavities (20), plugging the two auxiliary tubes (201) to seal the heat exchange cavities (20) and form high-efficiency long heat pipes (10); or charging working medium into the heat exchange cavities (20) through the two auxiliary tubes (201), after a predetermined amount of working medium is charged in the heat exchange cavities (20), plugging one of the auxiliary tubes (201), and reaching a predetermined vacuum degree in the heat exchange cavities (20) by exhausting through the other auxiliary tube (201), and then plugging the other auxiliary tube (201) to seal the heat exchange cavities (20) and form high-efficiency long heat pipes (10).

2. The green manufacturing method of claim 1, wherein, In the chemical treatment, the heat pipe body is rotated to make the chemical agent flow through the inner wall of the heat exchange cavity (20).

3. The green manufacturing method of claim 1, wherein, The chemical treatment is performed for 1 to 5 times, and the total treatment time is 5 minutes to 30 minutes, and the heat exchange cavities (20) are flushed with clean water after the chemical treatment.

4. The green manufacturing method of claim 1, wherein, In the chemical treatment, one of the two auxiliary pipes (201) is a liquid inlet pipe and the other is a liquid outlet pipe, the plurality of heat pipe bodies are connected in sequence, the liquid outlet pipe of the last heat pipe body is connected to the liquid inlet pipe of the next heat pipe body through a first hose (202), the liquid outlet pipe of the last heat pipe body is connected to the liquid inlet pipe of the first heat pipe body through a second hose (203), and a chemical pump (204) is arranged on the second hose (203).

5. The green manufacturing method of claim 4, wherein, A chemical storage tank (205) is further arranged on the second hose (203), and the chemical storage tank (205) is arranged to store chemical agents.

6. The green manufacturing method of claim 1, wherein, In the assembly, the sleeve flexible leg (4) is provided with at least one; When the sleeve flexible leg (4) is provided with a plurality of sleeve flexible legs (4), the plurality of sleeve flexible legs (4) are arranged on the inner tube (1) in an axial direction, and the distance between adjacent two sleeve flexible legs (4) is L1, 1.5 meters≤L1≤2.5 meters.

7. The green manufacturing method of claim 1, wherein, In the assembly, the sleeve flexible leg (4) includes a sleeve portion (41) and a leg portion (42), the leg portion (42) includes a plurality of flexible legs, the plurality of flexible legs are arranged on the sleeve portion (41) in a circumferential direction, and the length of the sleeve portion (41) in the axial direction of the inner tube (1) is L2, 15 millimeters≤L2≤30 millimeters.

8. The green manufacturing method of claim 7, wherein, The flexible leg is a straight leg (421) or a corrugated leg (422).

9. The green manufacturing method according to any one of claims 1 to 8, wherein, At least one of the two end covers (3) is a curved end cover.

10. A high-efficiency long heat pipe, comprising an inner tube (1), an outer tube (2), a sleeve flexible leg (4), and an end cover (3) arranged at both ends of the outer tube (2); The outer tube (2) is arranged outside the inner tube (1), the sleeve flexible leg (4) is arranged between the inner tube (1) and the outer tube (2), two end covers (3) are arranged at both ends of the outer tube (2), at least one of the two end covers (3) is a curved end cover, and both ends of the inner tube (1) extend out of the outer tube (2) through the end covers (3).

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