Flexible heat pipe and manufacturing method thereof

Abstract

The invention discloses a flexible heat pipe and a manufacturing method thereof.The flexible heat pipe comprises a flexible bent pipe and heat transfer pipes, a heat insulation cavity is formed in the flexible bent pipe, the two ends of the flexible bent pipe are each connected with one heat transfer pipe, a heat transfer cavity is formed in each heat transfer pipe, and the heat transfer cavities communicate with the heat insulation cavity to form a sealing cavity; and the sealing cavity is internally provided with a wick and is filled with a working medium. The flexible bending pipe can be attached to various curved surface structures or bending surface structures through bending, heat can be conducted from one heat transfer cavity to the other heat transfer cavity to achieve heat conduction, the flexible heat pipe has the bending and heat transfer functions, the flexible bending pipe can be adaptively attached to various equipment structures, the heat dissipation area is increased, the heat dissipation uniformity is improved, and the service life of the flexible bending pipe is prolonged. Efficient heat dissipation can be achieved, heat accumulation is effectively avoided, the service life of equipment is prolonged, and the user experience feeling is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pipes, and in particular to a flexible heat pipe and a manufacturing method thereof. Background Art

[0002] At present, with the development of technologies such as virtual reality (VR), augmented reality (AR), and mixed reality (MR), virtual reality complete equipment such as head-mounted displays and smart glasses are updated and iterated. Due to the small size of virtual reality complete products and the local concentration of chips, the heat flux density in the local area is large, and the temperature is very easy to exceed the chip design requirements or the human body experience temperature. Long-term high temperature not only easily reduces the product life, but also affects the user experience. Therefore, it is necessary to set a heat dissipation structure in the product to assist in rapid heat dissipation. However, the structure of the virtual reality complete product is complex, with many curved structures, and contains various bending structures such as the hinge of the glasses leg, resulting in the inability of existing heat pipes, heat sinks and other heat dissipation structures to fully exert the heat dissipation effect. The heat dissipation structure has a small coverage area and poor heat dissipation uniformity, and is not suitable for heat dissipation at curved surfaces and bending structures, resulting in heat accumulation. Summary of the invention

[0003] The main purpose of the present invention is to provide a flexible heat pipe and a manufacturing method thereof, aiming to solve the problem of poor heat dissipation effect of the heat dissipation structure in virtual reality equipment.

[0004] To achieve the above object, the present invention provides a flexible heat pipe, the flexible heat pipe comprising:

[0005] A flexible bending tube, wherein a heat-insulating cavity is formed in the flexible bending tube;

[0006] Heat transfer tube, each of the two ends of the flexible bending tube is connected with a heat transfer tube, a heat transfer cavity is formed in each of the heat transfer tubes, the heat transfer cavity is connected with the insulation cavity to form a sealed cavity, a liquid absorption core is arranged in the sealed cavity and filled with working fluid.

[0007] Optionally, the flexible bending tube includes two flexible bending plates, and the edges of the two flexible bending plates are connected to each other to enclose the insulation cavity.

[0008] Optionally, each of the flexible bending plates is provided with a plurality of grooves, and the plurality of grooves are arranged in sequence along the extension direction of the flexible bending plates to form a corrugated structure on the flexible bending plates.

[0009] Optionally, each of the flexible bending plates includes a bending portion, a first connecting portion and a second connecting portion, the bending portion is provided with a plurality of grooves, and the first connecting portion and the second connecting portion are arranged on both sides of the bending portion; in the two flexible bending plates, the two first connecting portions are connected to each other, and the two second connecting portions are connected to each other to enclose the insulating cavity.

[0010] Optionally, among the two heat transfer tubes, one of the heat transfer tubes is an evaporation tube, and the other heat transfer tube is a condensation tube.

[0011] Optionally, the heat transfer tube is a flat tube.

[0012] Optionally, the number of the absorbent cores is at least two, and at least two of the absorbent cores are spaced apart and arranged in the sealed cavity.

[0013] The present invention also provides a method for manufacturing a flexible heat pipe, the method comprising the following steps:

[0014] A liquid wick and two heat transfer tubes are provided, wherein a heat transfer cavity is formed in each of the heat transfer tubes;

[0015] The two ends of the liquid wick are respectively inserted into the two heat transfer tubes;

[0016] A flexible bending tube is wrapped around the liquid absorbent core; wherein a heat-insulating cavity is formed inside the flexible bending tube;

[0017] The two heat transfer tubes are respectively sealed and welded to the two ends of the flexible bending tube, so that the heat transfer cavity is connected with the insulation cavity to form a sealed cavity;

[0018] A working medium is poured into the sealing cavity and both ends of the sealing cavity are sealed.

[0019] Optionally, the step of wrapping a flexible bending tube around the absorbent core comprises:

[0020] Two flexible bending plates are provided;

[0021] The two flexible bending plates are arranged on both sides of the liquid absorbent core;

[0022] The edges of the two flexible bending plates are sealed and welded to form the flexible bending tube.

[0023] Optionally, the step of providing two flexible bending plates comprises:

[0024] Two panels are provided;

[0025] Making a bending portion on each of the plates so that each of the plates forms the flexible bending plate; wherein the first connecting portion and the second connecting portion are formed on both sides of the bending portion respectively;

[0026] The step of sealing and welding the edges of the two flexible bending plates to form the flexible bending tube comprises:

[0027] The first connection parts of the two flexible bending plates are sealed and welded, and the second connection parts of the two flexible bending plates are sealed and welded to form the flexible bending tube.

[0028] Optionally, the step of making a bending portion on each of the plates to form each of the plates into the flexible bending plate includes:

[0029] A plurality of grooves are formed by punching or bulging on each of the plates; wherein the plurality of grooves are arranged in sequence along the extension direction of the plates to form the bending portion of the corrugated structure on the plates.

[0030] Optionally, the step of sealing and welding the first connection parts of the two flexible bending plates and sealing and welding the second connection parts of the two flexible bending plates to form the flexible bending tube includes:

[0031] The two first connection parts are hermetically welded by laser welding, ultrasonic welding or diffusion welding, and the two second connection parts are hermetically welded by laser welding, ultrasonic welding or diffusion welding.

[0032] Optionally, the step of sealing and welding the two heat transfer tubes to the two ends of the flexible bent tube respectively so that the heat transfer cavity is connected with the insulation cavity and forms a sealed cavity comprises:

[0033] Laser spot welding the heat transfer tube to the end of the flexible bending tube;

[0034] The connection between the heat transfer tube and the flexible bending tube is brazed or laser welded.

[0035] In the flexible heat pipe of the present invention, the flexible heat pipe includes a flexible bending pipe and two heat transfer pipes respectively connected to the two ends of the flexible bending pipe, the flexible bending pipe has an insulating cavity inside, and the flexible bending pipe can be flexibly bent, the heat transfer pipe has a heat transfer cavity connected to the insulating pipe, the two ends of the insulating cavity are respectively connected to the two heat transfer cavities to form a sealed cavity, the two ends of the sealed cavity are sealed and the sealed cavity is filled with a working medium that can conduct heat through phase change, the liquid absorption core has capillary suction ability and is arranged in the sealed cavity; the flexible bending pipe can be bent to fit a variety of curved surface structures or bent surface structures, and heat can be conducted from one of the heat transfer cavities to the other heat transfer cavity through the insulating cavity to achieve heat conduction, so that the flexible heat pipe of the present invention has both bending and heat transfer functions, can adaptably fit a variety of equipment structures, increase the heat dissipation area, improve the heat dissipation uniformity, and achieve efficient heat dissipation, effectively avoid heat accumulation, extend the service life of the equipment, and enhance the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0037] Figure 1 This is a schematic diagram of the structure of a flexible heat pipe according to an embodiment of the present invention;

[0038] Figure 2 This is a schematic structural diagram of a flexible bent tube in a flexible heat pipe according to an embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of the front view of the structure of a flexible bending plate in a flexible heat pipe according to an embodiment of the present invention;

[0040] Figure 4 It is a schematic side view of the structure of a flexible bending plate in a flexible heat pipe according to an embodiment of the present invention;

[0041] Figure 5 It is a schematic flow chart of a first embodiment of a method for manufacturing a flexible heat pipe according to the present invention;

[0042] Figure 6 It is a schematic flow chart of a second embodiment of a method for manufacturing a flexible heat pipe of the present invention;

[0043] Figure 7 It is a detailed flow chart of step S31 and step S33 in the second embodiment of the method for manufacturing a flexible heat pipe of the present invention;

[0044] Figure 8 It is a schematic flow chart of a third embodiment of a method for manufacturing a flexible heat pipe according to the present invention.

[0045] Description of Figure Numbers:

[0046] Label name Label name 100 Flexible heat pipe 142 First connection part 10 Flexible bending tube 143 Second connection part 11 Insulation cavity 20 Heat transfer tube 12 Grooves 20a Evaporation pipe 13 Corrugated structure 20b Condenser 14 Flexible bending plate 21 Heat transfer cavity 141 Bending Department 30 Liquid wick

[0047] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0048] The technical solution in this embodiment will be described clearly and completely below in conjunction with the drawings in this embodiment. Obviously, the described embodiment is only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] It should be noted that all directional indications in this embodiment (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0050] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0051] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention. It should be understood that the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0053] In the present invention, the descriptions of directions such as "up", "down", "front", "back", "left", and "right" are as follows: Figure 1 The directions shown are for reference only and are used to explain the Figure 1 The relative position relationship between the components in the shown posture. If the specific posture changes, the directional indication will also change accordingly.

[0054] The present invention provides a flexible heat pipe 100 .

[0055] like Figures 1 to 4As shown, the flexible heat pipe 100 of this embodiment includes a flexible bending tube 10 and a heat transfer tube 20. An insulating cavity 11 is formed in the flexible bending tube 10. Both ends of the flexible bending tube 10 are connected to a heat transfer tube 20. A heat transfer cavity 21 is formed in each heat transfer tube 20. The heat transfer cavity 21 is connected to the insulating cavity 11 to form a sealed cavity. A liquid wick 30 is provided in the sealed cavity and filled with a working medium. It should be noted that the flexible heat pipe 100 of this embodiment can dissipate heat by conducting heat. The flexible heat pipe 100 can be applied to various virtual reality complete equipment such as head-mounted displays, AR glasses, VR glasses, etc. to play a role in rapid heat dissipation.

[0056] Specifically, the flexible heat pipe 100 includes a flexible bending pipe 10 and two heat transfer pipes 20 respectively connected to the two ends of the flexible bending pipe 10. The flexible bending pipe 10 has an insulating cavity 11, and the flexible bending pipe 10 can be flexibly bent. The heat transfer pipe 20 has a heat transfer cavity 21 connected to the insulating pipe. The two ends of the insulating cavity 11 are respectively connected to the two heat transfer cavities 21 to form a sealed cavity. The two ends of the sealed cavity are sealed and the sealed cavity is filled with a working medium that can conduct heat through phase change, such as water, methanol, acetone and other liquid working media. The liquid wick 30 has It has capillary suction capability and is arranged in a sealed cavity; the flexible bending tube 10 can bend to fit the curved surface or bent surface of the virtual reality complete device, and the heat can be transferred from one of the heat transfer cavities 21 through the insulating cavity 11 to the other heat transfer cavity 21 to achieve heat conduction, so that the flexible heat pipe 100 has both bending and heat transfer functions, which can not only adapt to the structure of the virtual reality complete device, increase the heat dissipation area, improve the heat dissipation uniformity, but also achieve efficient heat dissipation, effectively avoid heat accumulation, extend the service life of the equipment, and enhance the user experience.

[0057] In this embodiment, the flexible bending tube 10 includes two flexible bending plates 14, and the edges of the two flexible bending plates 14 are connected to each other to form an insulating cavity 11. Figures 1 to 4 As shown, the two flexible bending plates 14 are symmetrically distributed on both sides of the wick 30, and the edges of the two flexible bending plates 14 are connected one by one to enclose an insulating cavity 11, and the two flexible bending plates 14 can be flexibly bent, so that the two flexible bending plates 14 can be bent according to actual usage requirements to fit the structure of the virtual reality device, effectively increasing the heat dissipation area, and the two flexible bending plates 14 are connected to each other to enclose the insulating cavity 11, which effectively reduces the volume of the flexible bending tube 10, saves the space occupied by the flexible heat pipe 100, and is conducive to the miniaturized design of the equipment.

[0058] In this embodiment, each flexible bending plate 14 is provided with a plurality of grooves 12, and the plurality of grooves 12 are sequentially arranged along the extension direction of the flexible bending plate 14 to form a corrugated structure 13 on the flexible bending plate 14. Figures 1 to 4As shown, each flexible bending plate 14 is provided with a plurality of grooves 12 on the side facing away from the insulation cavity 11, and the plurality of grooves 12 are arranged in sequence to form a bendable corrugated structure 13, so that the flexible bending plate 14 can be bent through the corrugated structure 13 and then fit the curved surface or bent surface of the virtual reality equipment, which is suitable for heat dissipation of a variety of virtual reality equipment.

[0059] Furthermore, each flexible bending plate 14 includes a bending portion 141, a first connecting portion 142 and a second connecting portion 143. The bending portion 141 is provided with a plurality of grooves 12. The first connecting portion 142 and the second connecting portion 143 are respectively arranged on both sides of the bending portion 141. In two flexible bending plates 14, the two first connecting portions 142 are connected to each other, and the two second connecting portions 143 are connected to each other to enclose the heat-insulating cavity 11. Figures 1 to 4 As shown, a corrugated structure 13 is formed on the bending portion 141, and the corrugated structure 13 includes a plurality of grooves 12 arranged in sequence, so that the flexible bending plate 14 can be flexibly bent and fit a variety of curved surfaces and bending surface structures, and has the advantages of strong adaptability and high versatility. The first connecting portion 142 and the second connecting portion 143 are respectively arranged on both sides of the bending portion 141, and the two first connecting portions 142 are connected to each other, and the two second connecting portions 143 are connected to each other so that an insulating cavity 11 is enclosed between the two bending portions 141, which not only has the advantage of easy processing and manufacturing, but also improves the sealing of the insulating cavity 11.

[0060] In the two heat transfer tubes 20 of this embodiment, one heat transfer tube 20 is an evaporation tube 20a, and the other heat transfer tube 20 is a condensation tube 20b. Figure 1 As shown, one end of the flexible bent tube 10 is connected to the evaporating tube 20a, and the other end of the flexible bent tube 10 is connected to the condensing tube 20b. The working medium in the evaporating tube 20a is heated and evaporates, and the heat is transferred to the condensing tube 20b through the insulating tube. The condensing tube 20b condenses the evaporated working medium into liquid. Under the action of the capillary suction force of the liquid wick 30, the liquid flows back to the evaporating tube 20a, completing the heat transfer from the heat transfer cavity 21 in the evaporating tube 20a to the heat transfer cavity 21 in the condensing tube 20b. It has the advantage of high thermal conductivity efficiency and meets the requirements of high heat dissipation in a small space of the virtual reality equipment.

[0061] In this embodiment, Figure 1 As shown, the heat transfer tube 20 is a flat tube, that is, the cross section of the heat transfer tube 20 is an elliptical, track-shaped or rectangular flattened structure. The heat transfer tube 20 is connected to the end of the flexible bent tube 10 and is used to conduct heat, so that the flexible heat pipe 100 has the advantage of efficient heat transfer, and the flat tube not only reduces the occupied space, improves the space utilization rate, and is conducive to the miniaturized design of the equipment, but also increases the heat transfer area, further improving the heat conduction efficiency.

[0062] In a preferred embodiment, the number of the absorbent cores 30 is at least two, and at least two absorbent cores 30 are disposed in the sealed cavity at intervals. Figure 1 and Figure 2 As shown, the sealed cavity includes an insulating cavity 11 and two heat transfer cavities 21 which are interconnected. The liquid wick 30 extends in the same direction as the sealed cavity, and the two liquid wicks 30 are arranged in the sealed cavity at intervals along the width direction of the sealed cavity. The liquid wick 30 is a capillary porous metal wire structure with capillary suction force, which can draw the liquid working medium in the condenser 20b into the evaporator 20a to complete the heat conduction and the phase change cycle of the working medium. The structure is flexible and reliable, and the heat dissipation efficiency is improved.

[0063] In a preferred embodiment, Figure 3 and Figure 4 As shown, the thickness of the flexible bending plate 14 is t, t=0.05mm~0.07mm, preferably t=0.06mm; further, the widths of the first connection part 142 and the second connection part 143 are both w1, w1=1mm~3mm; the width of the bending part 141 is w2, w2≥3mm; the width of the transition connection between the bending part 141 and the first connection part 142, and the width of the transition connection between the bending part 141 and the second connection part 143 are both w3, w3=0.5mm~2mm; the vertical distance between the bottom groove wall of the groove 12 and the first connection part 142, and the vertical distance between the bottom groove wall of the groove 12 and the second connection part 143 are both h, h=0.1mm~0.5mm; it is not only convenient for the processing and forming of the groove 12, ensuring the bending performance of the flexible bending plate 14, but also convenient for the welding of the first connection part 142 and the second connection part 143, and the structure is stable and reliable.

[0064] The present invention also provides a method for manufacturing a flexible heat pipe. Figure 5 , is a schematic flow chart of a first embodiment of a method for manufacturing a flexible heat pipe according to the present invention, wherein the method for manufacturing a flexible heat pipe comprises the following steps:

[0065] Step S10, providing a liquid wick and two heat transfer tubes; wherein each of the heat transfer tubes has a heat transfer cavity formed therein;

[0066] Step S20, inserting two ends of the liquid wick into the two heat transfer tubes respectively;

[0067] One end of the liquid absorbent core 30 is inserted into the heat transfer cavity 21 of one of the heat transfer tubes 20 , and the other end of the liquid absorbent core 30 is inserted into the heat transfer cavity 21 of the other heat transfer tube 20 .

[0068] Step S30, wrapping a flexible bending tube around the absorbent core; wherein a heat-insulating cavity is formed inside the flexible bending tube;

[0069] A flexible bent tube 10 is provided, placed between two heat transfer tubes 20 , and wrapped around the absorbent core 30 , so that the middle portion of the absorbent core 30 is located in the insulating cavity 11 of the flexible bent tube 10 .

[0070] Step S40, sealingly welding the two heat transfer tubes to the two ends of the flexible bending tube respectively, so that the heat transfer cavity is connected with the insulation cavity to form a sealed cavity;

[0071] One end of the flexible bent tube 10 is sealed and welded to one of the heat transfer tubes 20, and the other end of the flexible bent tube 10 is sealed and welded to another heat transfer tube 20, so that both ends of the insulation cavity 11 are respectively connected to the two heat transfer cavities 21 to form a sealed cavity.

[0072] Step S50, pouring a working medium into the sealed cavity and sealing both ends of the sealed cavity;

[0073] After the sealed cavity is evacuated to negative pressure, the working medium is poured in so that the working medium fills the sealed cavity, and the ends of the two heat transfer tubes 20 away from the flexible bending tube 10 are sealed to seal the working medium and the liquid wick 30 in the sealed cavity.

[0074] The manufacturing method of the flexible heat pipe of this embodiment seals and welds the heat transfer pipe 20 to both ends of the flexible bending pipe 10, so that the flexible heat pipe 100 can have both heat transfer and bending functions, wherein the heat transfer pipe 20 is used to conduct heat to accelerate the heat dissipation rate, and the flexible bending pipe 10 can be adaptively bent to fit the structural shape of the virtual reality equipment, which is not only easy to manufacture, but also has a wide range of applications, thereby improving the versatility of the structure.

[0075] Reference Figure 6 , is a flow chart of a second embodiment of a method for manufacturing a flexible heat pipe according to the present invention. Based on the first embodiment, step S30 includes:

[0076] Step S31, providing two flexible bending plates;

[0077] Step S32, disposing the two flexible bending plates on both sides of the absorbent core;

[0078] The two flexible bending plates 14 are respectively disposed on both sides of the absorbent core 30 so as to cover the absorbent core 30 between the two flexible bending plates 14 .

[0079] Step S33, sealing and welding the edges of the two flexible bending plates to form the flexible bending tube;

[0080] The two flexible bending plates 14 are symmetrically arranged. By sealing and welding the edges of the two flexible bending plates 14 one by one, an insulating cavity 11 is formed between the two flexible bending plates 14, which is not only convenient for processing and manufacturing, but also reduces the volume of the flexible bending tube 10 and increases the heat dissipation area of ​​the flexible bending tube 10. The liquid absorbent core 30 is located in the insulating cavity 11 and passes through the insulating cavity 11 to play a role in capillary suction of the working medium.

[0081] Reference Figure 7 , is a detailed flow chart of step S31 and step S33 in the second embodiment of the method for manufacturing a flexible heat pipe of the present invention, wherein step S31 comprises:

[0082] Step S311, providing two plates;

[0083] Step S312, making a bending portion on each of the plates, so that each of the plates forms the flexible bending plate; wherein the first connecting portion and the second connecting portion are formed on both sides of the bending portion respectively;

[0084] The flexible bending plate 14 can be flexibly bent through the bending portion 141 , and the first connecting portion 142 and the second connecting portion 143 are respectively disposed on two sides of the bending portion 141 .

[0085] The step S33 comprises:

[0086] Step S331, sealing and welding the first connection parts of the two flexible bending plates, and sealing and welding the second connection parts of the two flexible bending plates to form the flexible bending tube;

[0087] The two oppositely disposed first connecting parts 142 are seal-welded, and the two oppositely disposed second connecting parts 143 are seal-welded, so that an insulating cavity 11 is enclosed between the two bent parts 141. The contact area between the first connecting part 142 and the second connecting part 143 is increased, which has the advantage of facilitating seal welding and improving the sealing of the insulating cavity 11.

[0088] In one embodiment, the step S312 includes:

[0089] Punching or bulging each of the plates to form a plurality of grooves; wherein the plurality of grooves are arranged in sequence along the extension direction of the plates to form the bending portion of the corrugated structure on the plates;

[0090] like Figures 1 to 4 As shown, each flexible bending plate 14 is formed with a plurality of grooves 12, and the plurality of grooves 12 are arranged in sequence along the extension direction of the flexible bending plate 14 to form a bendable corrugated structure 13. The plurality of grooves 12 can be integrally formed by stamping or bulging technology, and has the advantages of good bending performance and easy processing.

[0091] In one embodiment, the step S331 includes:

[0092] Using laser welding, ultrasonic welding or diffusion welding to seal and weld the two first connection parts, and using laser welding, ultrasonic welding or diffusion welding to seal and weld the two second connection parts;

[0093] Specifically, the sealing welding of the two first connection parts 142 and the sealing welding of the two second connection parts 143 are laser welding, ultrasonic welding or diffusion welding, which has the advantages of good sealing effect, preventing heat dissipation and sealing working medium.

[0094] Reference Figure 8 , is a flow chart of a third embodiment of a method for manufacturing a flexible heat pipe according to the present invention. Based on the first embodiment, step S40 includes:

[0095] Step S41, laser spot welding the heat transfer tube to the end of the flexible bending tube;

[0096] The heat transfer tube 20 is fixed to the end of the flexible bending tube 10 by laser spot welding, so that the heat transfer cavity 21 in the heat transfer tube 20 is connected with the insulation cavity 11 in the flexible bending tube 10, and the connection structure is stable and reliable.

[0097] Step S42, brazing or laser welding the connection between the heat transfer tube and the flexible bending tube;

[0098] Brazing or laser welding is performed at the connection between the heat transfer tube 20 and the flexible bent tube 10 to seal the connection between the heat transfer tube 20 and the flexible bent tube 10, thereby enhancing the sealing performance of the sealing cavity, effectively preventing heat dissipation and working fluid leakage, and further improving the stability of the structure.

[0099] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A flexible heat pipe, characterized in that: The flexible heat pipe comprises: A flexible bending tube, wherein a heat-insulating cavity is formed in the flexible bending tube; Heat transfer tube, each of the two ends of the flexible bending tube is connected with a heat transfer tube, a heat transfer cavity is formed in each of the heat transfer tubes, the heat transfer cavity is connected with the insulation cavity to form a sealed cavity, a liquid absorption core is arranged in the sealed cavity and filled with working fluid.

2. The flexible heat pipe according to claim 1, characterized in that The flexible bending tube comprises two flexible bending plates, and the edges of the two flexible bending plates are connected to each other to enclose the thermal insulation cavity.

3. The flexible heat pipe according to claim 2, characterized in that Each of the flexible bending plates is provided with a plurality of grooves, and the plurality of grooves are arranged in sequence along the extension direction of the flexible bending plate to form a corrugated structure on the flexible bending plate.

4. The flexible heat pipe according to claim 3, characterized in that Each of the flexible bending plates includes a bending portion, a first connecting portion and a second connecting portion, the bending portion is provided with a plurality of grooves, and the first connecting portion and the second connecting portion are arranged on both sides of the bending portion; in the two flexible bending plates, the two first connecting portions are connected to each other, and the two second connecting portions are connected to each other to enclose the insulation cavity.

5. The flexible heat pipe according to any one of claims 1 to 4, characterized in that: Among the two heat transfer tubes, one of the heat transfer tubes is an evaporation tube, and the other heat transfer tube is a condensation tube.

6. The flexible heat pipe according to any one of claims 1 to 4, characterized in that: The heat transfer tube is a flat tube.

7. The flexible heat pipe according to any one of claims 1 to 4, characterized in that: The number of the liquid absorbent cores is at least two, and at least two of the liquid absorbent cores are arranged in the sealed cavity at intervals.

8. A method for manufacturing a flexible heat pipe, characterized in that: The method for manufacturing the flexible heat pipe comprises the following steps: A liquid wick and two heat transfer tubes are provided, wherein a heat transfer cavity is formed in each of the heat transfer tubes; The two ends of the liquid wick are respectively inserted into the two heat transfer tubes; A flexible bending tube is wrapped around the liquid absorbent core; wherein a heat-insulating cavity is formed inside the flexible bending tube; The two heat transfer tubes are respectively sealed and welded to the two ends of the flexible bending tube, so that the heat transfer cavity is connected with the insulation cavity to form a sealed cavity; A working medium is poured into the sealing cavity and both ends of the sealing cavity are sealed.

9. The method for manufacturing a flexible heat pipe according to claim 8, characterized in that: The step of wrapping a flexible bending tube around the absorbent core comprises: Two flexible bending plates are provided; The two flexible bending plates are arranged on both sides of the liquid absorbent core; The edges of the two flexible bending plates are sealed and welded to form the flexible bending tube.

10. The method for manufacturing a flexible heat pipe according to claim 9, characterized in that: The step of providing two flexible bending plates comprises: Two panels are provided; Making a bending portion on each of the plates so that each of the plates forms the flexible bending plate; wherein the first connecting portion and the second connecting portion are formed on both sides of the bending portion respectively; The step of sealing and welding the edges of the two flexible bending plates to form the flexible bending tube comprises: The first connection parts of the two flexible bending plates are sealed and welded, and the second connection parts of the two flexible bending plates are sealed and welded to form the flexible bending tube.

11. The method for manufacturing a flexible heat pipe according to claim 10, characterized in that: The step of making a bending portion on each of the plates to form each of the plates into the flexible bending plate comprises: A plurality of grooves are formed by punching or bulging on each of the plates; wherein the plurality of grooves are arranged in sequence along the extension direction of the plates to form the bending portion of the corrugated structure on the plates.

12. The method for manufacturing a flexible heat pipe according to claim 10, wherein: The step of sealing and welding the first connection parts of the two flexible bending plates and sealing and welding the second connection parts of the two flexible bending plates to form the flexible bending tube comprises: The two first connection parts are hermetically welded by laser welding, ultrasonic welding or diffusion welding, and the two second connection parts are hermetically welded by laser welding, ultrasonic welding or diffusion welding.

13. The method for manufacturing a flexible heat pipe according to any one of claims 8 to 12, characterized in that: The step of sealing and welding the two heat transfer tubes to the two ends of the flexible bending tube respectively so that the heat transfer cavity is connected with the insulation cavity and forms a sealed cavity comprises: Laser spot welding the heat transfer tube to the end of the flexible bending tube; The connection between the heat transfer tube and the flexible bending tube is brazed or laser welded.

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