Flexible telescopic integrated heat pipe for heat management

Abstract

The invention discloses a flexible telescopic integrated heat pipe for heat management. The flexible telescopic integrated heat pipe comprises an evaporation end, a heat insulation section and a condensation end. By means of the layered design, the heat dissipation capacity of the heat pipe under the low-temperature condition is restrained, and the heat transfer capacity is guaranteed by implanting the heat exchange fins into the outer side of the movable end. When the temperature of the heat pipe is lower than the starting temperature, the movable end can shrink into the heat insulation section, and the heat exchange fins are clamped on the clamping columns and also shrink into the heat insulation section. Therefore, the volume of the heat exchange end is flexibly adjusted, efficient heat exchange is guaranteed during working, and efficient heat preservation is achieved during stopping. The telescopic structure and the heat pipe are integrated into a whole, the integrated structure is simple, the cost is low, design parameters can be adjusted according to working condition requirements, and the manufacturing process is mature.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pipes, in particular to a flexible and retractable integrated heat pipe for heat management. Background Art

[0002] With the continuous reduction in the size of equipment and the continuous increase in power density in various fields such as electronic equipment, automobiles, and aerospace vehicles, the requirements for the heat dissipation performance of equipment are also increasing, so thermal management technology has become more and more critical. According to whether the thermal management process consumes additional energy, thermal management technology is divided into active thermal management technology and passive thermal management technology. Passive thermal management systems do not require external force-driven equipment such as fans and pumps. The system structure is simple and compact, easy to maintain, and does not require complex system devices and control systems for active heat dissipation. The overall cost is relatively low. Therefore, passive thermal management technology has been widely used in thermal management in the fields of solar cells, lithium-ion batteries, electronic devices, power equipment, and various waste heat recovery scenarios. At present, passive thermal management technologies mainly include heat pipes, thermal pads / thermal conductive materials, heat sinks, thermal isolation and other technologies.

[0003] Heat pipe is a simple and efficient heat transfer element that does not require additional energy to drive. It has been widely used in heat exchangers, aerospace, and energy storage system construction.

[0004] Generally, a heat pipe is composed of a tube shell, a liquid wick and an end cap. The inside of the heat pipe is pumped into a negative pressure state and filled with an appropriate liquid to adjust the boiling point of the internal filling liquid. The tube wall has a liquid wick, which is made of capillary porous material. If the tube wall does not have a liquid wick, the influence of gravity needs to be considered. The heat pipe is mainly divided into an evaporation end, an adiabatic section and a condensation end. When the evaporation end of the heat pipe is heated, the internal filling liquid vaporizes rapidly. The steam flows through the adiabatic section under the power of heat diffusion, flows to the condensation end, and condenses at the cold end to release heat. The liquid then flows back to the evaporation end along the porous material by capillary action, and the cycle continues until the temperatures at both ends of the heat pipe are equal (at this time, the steam heat diffusion stops). This cycle is carried out quickly, and heat can be conducted continuously. This structure has been fixed since the heat pipe was manufactured and applied.

[0005] However, the ultra-high thermal conductivity of heat pipes also brings challenges to their application in some scenarios. For example, in lithium-ion battery thermal management systems, the battery pack needs to have a high thermal insulation capacity in low-temperature environments to slow down the rate at which the battery temperature drops. For battery packs, due to requirements such as compactness and efficient heat exchange, heat pipes in battery thermal management systems are usually in close contact with the heat transfer medium through the battery to ensure efficient heat dissipation at the evaporation end; in order to ensure efficient condensation at the condensation end, metal fins need to be installed on the heat pipes at the condensation end to enhance heat dissipation. Even if the battery pack system is insulated, the evaporation end will still lose more heat due to the large insulation area, which inhibits the insulation capacity of the battery pack in low-temperature environments.

[0006] For example, in a spacecraft, when the spacecraft is on the back of the moon, low ambient temperature and vibration may cause the heat pipe to become brittle, fractured and broken. Therefore, during the spacecraft's dormant state, it will be necessary to enhance the insulation of the heat dissipation end of the heat pipe located on the outside of the spacecraft. However, the additional insulation structure and corresponding mechanical structure will increase the weight of the spacecraft and transportation cost, so the heat pipe itself needs to have insulation capabilities under such extreme conditions.

[0007] At the same time, the multi-cavity segmented heat pipe has the disadvantages of complex structure and high manufacturing cost.

[0008] In current research, there is no heat pipe design that solves the above problems. Summary of the invention

[0009] To this end, the technical problem to be solved by the present invention is to provide a flexible and retractable integrated heat pipe for thermal management, which can control the length of the evaporation end and / or the condensation end while enhancing the thermal insulation in a low temperature environment.

[0010] In order to solve the above technical problems, the present invention provides the following technical solutions: a flexible and retractable integrated heat pipe for thermal management, the heat pipe comprising an outer shell, an end cover, a flexible composite structure, a fixing ring buckle, a heat exchange fin, a strip metal button and a clamping column, a receiving cavity is provided in the outer shell, a capillary core is provided on the inner side of the receiving cavity and the end cover, and the capillary core is tightly fitted with the wall surface of the receiving cavity and the end cover; the flexible composite structure is in a cap shape, and a flexible capillary core is provided in its inner cavity, and the flexible capillary core is tightly fitted with the inner cavity wall surface of the flexible composite structure; the fixing ring buckle tightly connects the heat pipe and the flexible composite structure into a whole; the heat pipe and the flexible composite structure that are not connected by the fixing ring buckle are The port is sealed by an end cover made of the same material as the shell; the shell, the end cover, the flexible composite structure and the fixing ring buckle are tightly connected, and a closed cavity is formed inside; the accommodating cavity is under negative pressure and filled with a certain proportion of liquid, and the boiling temperature of the liquid in the accommodating cavity is the starting temperature of the heat pipe; on the outer side of the flexible composite structure, on the outer side of the shell connected to the outer side of the flexible composite structure along the axial direction, a clamping column is installed pointing to the outer side of the flexible composite structure, and the bottom end of the clamping column is tightly connected to the flexible composite structure; with the clamping buckle as the center of the circle, a plurality of heat exchange fins are installed on the outer side of the flexible composite structure; the bottom end of the heat exchange fin is tightly connected to the strip metal button; the strip metal button is tightly connected to the flexible composite structure;

[0011] The outer body of the flexible composite structure is made of a flexible and highly sealing material, such as rubber, PET film, etc.

[0012] The clamping column, heat exchange fins and strip-shaped metal buttons are made of high thermal conductivity hard materials, such as metal, carbon fiber material, high thermal conductivity composite material, etc., and can be elastically bent;

[0013] The shell and the fixing ring buckle are tightly fastened by nano injection molding, hot melt riveting and other processes;

[0014] The flexible composite structure and the fixed ring buckle are connected as a whole by heat welding, gluing, integral molding and other processes;

[0015] The bottom end of the heat exchange fin is tightly connected to the strip-shaped metal button by welding, integral molding, etc.

[0016] The clamping column, the strip-shaped metal button and the flexible composite structure are tightly connected by vulcanization bonding, gluing, nano injection molding and the like;

[0017] The flexible capillary core covers the inner side of the fixed ring buckle and is in close contact with the capillary core inside the shell;

[0018] The end cover and the shell can be tightly connected into a whole by welding or other methods;

[0019] Optionally, the end cover may not be installed, and the housing may be sealed at the end by extrusion welding, high frequency heating sealing, integral molding, etc.;

[0020] Optionally, the clamping column may not be installed;

[0021] Optionally, the heat exchange fins may not be installed;

[0022] Optionally, the strip-shaped metal button may not be installed;

[0023] According to the circulation process of the liquid working medium in the accommodating cavity, the heat pipe is divided into an evaporation end, an insulation section and a condensation end. The evaporation end and the condensation end of the heat pipe are divided into a fixed type and a movable type. The fixed evaporation end and the condensation end do not contain movable parts, and are composed of the shell and the end cover tightly connected; the movable type is composed of the shell, the fixed ring buckle and the flexible composite structure; the insulation section is the insulation section of the heat pipe and the sleeve, and the outer layer is coated with an insulation coating or installed with a thermal insulation layer to isolate the external heat exchange;

[0024] In the present invention, at least one of the evaporation end and the condensation end is movable;

[0025] When the temperature of the heat pipe is lower than the heat pipe start-up temperature, the movable type will shrink into the inside of the heat insulation section, the heat exchange fins will be engaged with the clamping column and also shrink into the inside of the heat insulation section, and the heat pipe will stop working;

[0026] The movable evaporation end will reserve a heat absorbing part to ensure the activation of the heat pipe;

[0027] When the temperature of the working environment of the heat pipe reaches the starting temperature or above, the liquid in the evaporation end will first absorb heat, boil and produce gas, so that the heat is transferred to the condensation end through the insulation section; during this process, the shell, the end cover, the flexible composite structure and the fixed ring buckle are tightly connected, and the pressure in the accommodation cavity formed therein continues to rise, pushing the movable evaporation end and / or the condensation end to extend from the insulation section, and the heat exchange fins are unfolded as the flexible composite structure extends, so as to accelerate the heat exchange rate;

[0028] When the temperature of the heat pipe is lower than the heat pipe starting temperature again, the liquid in the accommodating chamber condenses, and the pressure difference causes the movable evaporating end and / or condensing end to shrink into the insulating section. The heat exchange fins are engaged with the clamping column and also shrink into the insulating section, and the heat pipe stops working.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The present invention reduces the heat dissipation capacity of the heat pipe under low temperature conditions through flexible structural design.

[0031] 2. The present invention realizes flexible control of the heat pipe in the following manner: when the temperature of the heat pipe is lower than the starting temperature, the movable end will shrink into the inside of the heat insulation section, and the heat exchange fins will be engaged with the clamping column and also shrink into the inside of the heat insulation section. This realizes flexible adjustment of the volume of the heat exchange end, ensuring efficient heat exchange during operation and achieving efficient heat preservation during rest.

[0032] 3. The present invention integrates the telescopic structure and the heat pipe into a whole, has a simple structure, can adjust the design parameters according to the working conditions, and has a mature manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a heat pipe structure diagram of Example 1 of the present invention;

[0034] Figure 2 This is an axial cross-sectional structural diagram of the heat pipe in the heat preservation stage of Example 1 of the present invention;

[0035] Figure 3 The axial cross-sectional structure diagram of the heat pipe in which the condensation end is contracted into the insulation section during the heat preservation stage of Example 1 and Example 2 of the present invention;

[0036] Figure 4 It is an axial cross-sectional structural diagram of the connection between the heat pipe at the insulation section and the condensation end during the heat preservation stage of Example 1 and Example 2 of the present invention;

[0037] Figure 5 This is an axial cross-sectional structural diagram of the heat pipe during the working stage of Example 1 of the present invention;

[0038] Figure 6It is an axial cross-sectional structural diagram of the heat pipe at the adiabatic section and the condensation end during the working stages of Example 1 and Example 2 of the present invention;

[0039] Figure 7 This is an axial cross-sectional structural diagram of the heat pipe in the heat preservation stage of Example 2 of the present invention;

[0040] Figure 8 It is an axial cross-sectional structural diagram of the heat pipe at the insulation section and the condensation end during the heat preservation stage of Example 2 of the present invention;

[0041] Fig. 9 This is an axial cross-sectional structural diagram of the heat pipe during the working stage of Example 2 of the present invention;

[0042] Fig.10 This is an axial cross-sectional structural diagram of the evaporation end of the heat pipe during the working stage of Example 2 of the present invention;

[0043] In the figure, evaporation end 1; adiabatic section 2; condensation end 3;

[0044] Evaporation end capillary core 11; evaporation end housing 12; insulation-evaporation end fixing ring buckle 13; evaporation end internal liquid filling 14; evaporation end flexible composite structure 15; evaporation end clamping column 16; evaporation end heat exchange fin 17; evaporation end flexible sealing film 151; evaporation end flexible capillary core 152; evaporation end strip metal button 153;

[0045] Insulation section capillary core 21; insulation section housing 22; insulation-condensation end fixing ring buckle 23; insulation section filling liquid 24;

[0046] Condensation end flexible composite structure 31; condensation end clamp column 32; condensation end heat exchange fin 33; condensation end flexible sealing film 311; condensation end flexible capillary core 312; condensation end strip metal button 313; DETAILED DESCRIPTION

[0047] The specific embodiments of the present invention are given below. The specific embodiments are only used to further illustrate the present invention in detail and do not limit the protection scope of the claims of the present invention.

[0048] Embodiment 1:

[0049] See also Figure 1-6 , an embodiment of the present invention: a flexible and retractable integrated heat pipe for heat management, comprising an evaporation end 1; an insulation section 2; a condensation end 3; a liquid filling 14 in the evaporation end; an evaporation end capillary wick 11; an evaporation end shell 12; an insulation section capillary wick 21; an insulation section shell 22; an insulation-condensation end fixing ring buckle 23; a condensation end flexible composite structure 31; a condensation end clamping column 32; a condensation end heat exchange fin 33; a condensation end flexible sealing film 311; a condensation end flexible capillary wick 312; a condensation end strip metal button 313;

[0050] The evaporation end shell 12, the insulation section shell 22, the insulation-condensation end fixing ring buckle 23 and the condensation end flexible composite structure 31 form a whole with a containing cavity, and the evaporation end capillary core 11, the insulation section capillary core 21 and the condensation end flexible capillary core 312 are respectively arranged on the inner side of the containing cavity, and the capillary core is tightly fitted with the inner wall surface of the containing cavity, and the containing cavity is negative pressure and filled with a certain proportion of liquid, that is, the evaporation end is filled with liquid 14, and the boiling temperature of this liquid in the containing cavity is the starting temperature of the heat pipe; the outer side of the condensation end flexible composite structure 31 is connected with the condensation end flexible composite structure 31, and the evaporation end capillary core 1 ... The axial direction of the insulation section shell 22 connected to the outside of the structure 31 points to the outside of the condensation end flexible composite structure 31, and a condensation end clamping column 32 is installed, and the bottom end of the condensation end clamping column 32 is tightly connected to the condensation end flexible sealing membrane 311; with the condensation end clamping column 32 as the center of the circle, a plurality of condensation end heat exchange fins 33 are installed on the outside of the condensation end flexible composite structure 31; the bottom end of the condensation end heat exchange fin 33 is tightly connected to the condensation end strip metal button 313; the condensation end strip metal button 313 is tightly connected to the condensation end flexible sealing membrane 311;

[0051] The condensation end flexible sealing film 311 is made of rubber;

[0052] The condensation end clamping column 32, the condensation end heat exchange fin 33 and the condensation end strip metal button 313 are made of aluminum alloy and can be elastically bent;

[0053] The insulation section housing 22 and the insulation-condensation end fixing ring buckle 23 are tightly fastened by a nano injection molding process;

[0054] The condensation end flexible composite structure 31 and the insulation-condensation end fixing ring buckle 23 are connected as a whole through a heat welding process;

[0055] The bottom end of the condensation end heat exchange fin 33 is tightly connected with the condensation end strip metal button 313 by an integral molding method;

[0056] The condensation end clamping column 32 and the condensation end strip metal button 313 are tightly connected with the condensation end flexible composite structure 31 by vulcanization bonding;

[0057] The condensation end flexible capillary core 312 covers the inner side of the insulation-condensation end fixing ring buckle 23 and is in close contact with the insulation section capillary core 21;

[0058] The outer side of the insulation section shell 22 is coated with an insulation coating;

[0059] At the beginning, the temperature of the heat pipe is lower than the heat pipe starting temperature, the condensation end 3 shrinks into the insulation section 2, and the condensation end flexible sealing film 311 is tightly connected with the insulation-condensation end fixing ring buckle 23; the condensation end flexible sealing film 311 is elastically bent and shrinks inside the insulation section 2, and the condensation end heat exchange fin 33 is engaged with the condensation end clamping column 32. As the condensation end flexible sealing film 311 also shrinks inside the insulation section 2, the heat pipe stops working;

[0060] When the temperature of the evaporation end 1 of the heat pipe reaches the starting temperature or above, the internal filling liquid 11 in the evaporation end 1 boils and produces gas, and the generated steam carries heat, passes through the insulation section 2, and reaches the condensation end flexible composite structure 31 of the condensation end 3. Since the condensation end flexible composite structure 31 shrinks inside the insulation section 2, the heat cannot be dissipated in time, and the heat accumulates inside the heat pipe, causing the pressure in the internal accommodating cavity of the heat pipe to continue to rise, pushing the condensation end 3 out of the insulation section 2, and the condensation end heat exchange fins 33 move along with the condensation end flexible composite structure 31. The condensation end card column 32, the condensation end heat exchange fin 33, the condensation end flexible sealing film 311 and the condensation end strip metal button 313 exchange heat with the surrounding environment, so that the steam reaching the inside of the condensation end 3 is condensed on the condensation end flexible capillary core 312, and the evaporation end filling liquid 14 after condensation extends along the condensation end flexible capillary core 312, passes through the insulation section capillary core 21 and the evaporation end capillary core 11, and returns to the evaporation end filling liquid 14, absorbs heat and evaporates again, so as to realize the continuous transmission of heat;

[0061] When the temperature of the evaporation end 1 is lower than the start-up temperature of the heat pipe again, the boiling gas production of the internal filling liquid 11 in the evaporation end 1 slows down, so that the heat transferred to the surrounding environment through the condensation end 3 per unit time is reduced, and the gas produced by the boiling in the internal accommodating cavity of the heat pipe is continuously condensed, causing the pressure in the internal accommodating cavity of the heat pipe to continuously decrease until it is lower than the preset threshold value. Under the action of the internal and external pressure difference, the condensation end 3 shrinks into the inside of the insulation section 2, and the condensation end heat exchange fins 33 are engaged with the condensation end clamping column 32. As the condensation end flexible sealing film 311 also shrinks inside the insulation section 2, the heat pipe stops working;

[0062] Embodiment 2:

[0063] Please refer to 1, 3, 4, 6-10, an embodiment of the present invention: a flexible and retractable integrated heat pipe for thermal management, evaporation end 1; insulation section 2; condensation end 3; evaporation end capillary wick 11; evaporation end shell 12; insulation-evaporation end fixing ring buckle 13; evaporation end internal liquid filling 14; evaporation end flexible composite structure 15; evaporation end clamping column 16; evaporation end heat exchange fin 17; insulation section capillary wick 21; insulation section shell 22; insulation-condensation end fixing ring buckle 23; insulation section internal liquid filling 24; condensation end flexible composite structure 31; condensation end clamping column 32; condensation end heat exchange fin 33; evaporation end flexible sealing film 151; evaporation end flexible capillary wick 152; evaporation end strip metal button 153; condensation end flexible sealing film 311; condensation end flexible capillary wick 312; condensation end strip metal button 313;

[0064] The evaporation end shell 12, the insulation-evaporation end fixing ring buckle 13, the evaporation end flexible composite structure 15, the insulation section shell 22, the insulation-condensation end fixing ring buckle 23 and the condensation end flexible composite structure 31 form a whole, and there is a accommodating cavity inside. The evaporation end capillary wick 11, the insulation section capillary wick 21, the evaporation end flexible capillary wick 152 and the condensation end flexible capillary wick 312 are respectively arranged on the inner side of the accommodating cavity. The capillary wicks are tightly fitted with the inner wall surface of the accommodating cavity. The accommodating cavity is negative pressure and filled with a certain proportion of liquid, that is, the evaporation end is filled with liquid 14 and the insulation section is filled with liquid 24. The boiling temperature of the liquid in the accommodating cavity is the start-up temperature of the heat pipe.

[0065] The axial direction of the insulation section shell 22 connected to the outside of the condensation end flexible composite structure 31 points to the outside of the condensation end flexible composite structure 31, and a condensation end clamping column 32 is installed. The bottom end of the condensation end clamping column 32 is tightly connected to the condensation end flexible sealing film 311; with the condensation end clamping column 32 as the center of the circle, a plurality of condensation end heat exchange fins 33 are installed on the outside of the condensation end flexible composite structure 31; the bottom end of the condensation end heat exchange fin 33 is tightly connected to the condensation end strip metal button 313; the condensation end strip metal button 313 is tightly connected to the condensation end flexible sealing film 311;

[0066] The evaporation end flexible composite structure 15 is outside, and the axial direction of the evaporation end housing 12 connected to the outside of the evaporation end flexible composite structure 15 points to the outside of the evaporation end flexible composite structure 15, and an evaporation end clamping column 16 is installed, and the bottom end of the evaporation end clamping column 16 is tightly connected to the evaporation end flexible sealing film 151; with the evaporation end clamping column 16 as the center of the circle, a plurality of evaporation end heat exchange fins 17 are installed on the outside of the evaporation end flexible composite structure 15; the bottom end of the evaporation end heat exchange fin 17 is tightly connected to the evaporation end strip metal button 153; the evaporation end strip metal button 153 is tightly connected to the evaporation end flexible sealing film 151;

[0067] The evaporation end flexible sealing film 151 and the condensation end flexible sealing film 311 are made of rubber;

[0068] The evaporation end clamping column 16, the evaporation end heat exchange fin 17, the evaporation end strip metal button 153, the condensation end clamping column 32, the condensation end heat exchange fin 33 and the condensation end strip metal button 313 are made of aluminum alloy and can be elastically bent;

[0069] The insulation section housing 22 and the insulation-condensation end fixing ring buckle 23 are tightly fastened by a nano injection molding process;

[0070] The evaporation end housing 12 and the heat insulation-evaporation end fixing ring buckle 13 are tightly fastened by a nano injection molding process;

[0071] The condensation end flexible composite structure 31 and the insulation-condensation end fixing ring buckle 23 are connected as a whole through a heat welding process;

[0072] The evaporation end flexible composite structure 15 and the heat insulation-evaporation end fixing ring buckle 13 are connected as a whole through a heat welding process;

[0073] The bottom end of the condensation end heat exchange fin 33 is tightly connected with the condensation end strip metal button 313 by an integral molding method;

[0074] The bottom end of the evaporation end heat exchange fin 17 is tightly connected with the evaporation end strip metal button 153 by integral molding;

[0075] The condensation end clamping column 32 and the condensation end strip metal button 313 are tightly connected with the condensation end flexible composite structure 31 by vulcanization bonding;

[0076] The evaporation end clamping column 16 and the evaporation end strip metal button 153 are tightly connected with the evaporation end flexible composite structure 15 by vulcanization bonding;

[0077] The condensation end flexible capillary core 312 covers the inner side of the insulation-condensation end fixing ring buckle 23 and is in close contact with the insulation section capillary core 21;

[0078] The evaporation end flexible capillary core 152 covers the inner side of the insulation-evaporation end fixing ring buckle 13 and is in close contact with the evaporation end capillary core 11;

[0079] The outer side of the insulation section shell 22 is coated with an insulation coating;

[0080] At the beginning, the temperature of the heat pipe is lower than the heat pipe starting temperature, the evaporation end 1 and the condensation end 3 shrink into the insulation section 2, and the evaporation end flexible sealing film 151 is tightly connected with the insulation-evaporation end fixing ring buckle 13; the evaporation end flexible sealing film 151 is elastically bent and shrinks inside the insulation section 2, and the evaporation end heat exchange fin 17 is engaged on the evaporation end clamping column 16, and the evaporation end flexible sealing film 151 is also shrunk inside the insulation section 2; the condensation end flexible sealing film 311 is tightly connected with the insulation-condensation end fixing ring buckle 23; the condensation end flexible sealing film 311 is elastically bent and shrinks inside the insulation section 2, and the condensation end heat exchange fin 33 is engaged on the condensation end clamping column 32, and the condensation end flexible sealing film 311 is also shrunk inside the insulation section 2; at this time, the heat pipe stops working;

[0081] When the temperature of the evaporation end 1 of the heat pipe reaches the starting temperature or above, the evaporation end filling liquid 14 in the evaporation end 1 boils and produces gas, and the generated steam carries heat, passes through the insulation section 2, and reaches the condensation end flexible composite structure 31 of the condensation end 3. Since the condensation end flexible composite structure 31 shrinks inside the insulation section 2, the heat cannot be dissipated in time, and the heat accumulates inside the heat pipe, causing the pressure in the internal accommodating cavity of the heat pipe to continue to rise, pushing the evaporation end 1 and the condensation end 3 to extend from the insulation section 2. The evaporation end heat exchange fins 17 and the condensation end heat exchange fins 33 are expanded as the evaporation end flexible composite structure 15 and the condensation end flexible composite structure 31 extend to accelerate the heat exchange rate; the evaporation end shell 12, the evaporation end column 16, The evaporation end heat exchange fins 17, the evaporation end flexible sealing film 151 and the evaporation end strip metal button 153 absorb the heat from the surrounding environment, so that the evaporation end liquid 14 and the insulation section liquid 24 boil; the condensation end card column 32, the condensation end heat exchange fins 33, the condensation end flexible sealing film 311 and the condensation end strip metal button 313 exchange heat with the surrounding environment, so that the steam reaching the inside of the condensation end 3 condenses on the condensation end flexible capillary wick 312, and the condensed evaporation end liquid 14 and the insulation section liquid 24 extend along the condensation end flexible capillary wick 312, through the insulation section capillary wick 21 and the evaporation end capillary wick 11, and return to the evaporation end liquid 14 and the insulation section liquid 24, and absorb heat and evaporate again, so as to realize the continuous transmission of heat;

[0082] When the temperature of the evaporation end 1 is lower than the start-up temperature of the heat pipe again, the boiling gas production of the internal filling liquid 11 in the evaporation end 1 slows down, so that the heat transferred to the surrounding environment through the condensation end 3 per unit time is reduced, and the gas produced by the boiling in the internal accommodating cavity of the heat pipe is continuously condensed, causing the pressure in the internal accommodating cavity of the heat pipe to continuously decrease until it is lower than the preset threshold value. Under the action of the internal and external pressure difference, the evaporation end 1 and the condensation end 3 shrink into the insulation section 2, and the evaporation end heat exchange fin 17 is engaged with the evaporation end clamping column 16. As the evaporation end flexible sealing membrane 151 shrinks inside the insulation section 2, the condensation end heat exchange fin 33 is engaged with the condensation end clamping column 32, and as the condensation end flexible sealing membrane 311 also shrinks inside the insulation section 2, the heat pipe stops working;

[0083] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A flexible and retractable integrated heat pipe for heat management, the heat pipe comprising a shell, an end cover, a flexible composite structure, a fixing ring buckle, a heat exchange fin, a strip metal button and a clamping column, a receiving cavity is provided in the shell, a capillary core is provided inside the receiving cavity and the end cover, and the capillary core is closely fitted with the wall surface of the receiving cavity and the end cover; the flexible composite structure is a cap-shaped structure, and a flexible capillary core is provided in its inner cavity, and the flexible capillary core is closely fitted with the inner cavity wall surface of the flexible composite structure; The fixing ring buckle tightly connects the heat pipe and the flexible composite structure into a whole; the port that does not connect the heat pipe and the flexible composite structure through the fixing ring buckle is sealed by an end cover made of the same material as the shell; the shell, the end cover, the flexible composite structure and the fixing ring buckle are tightly connected, and a closed cavity is formed therein; the accommodating cavity is under negative pressure and filled with a certain proportion of liquid, and the boiling temperature of the liquid in the accommodating cavity is the starting temperature of the heat pipe; on the outside of the flexible composite structure, on the shell connected to the outside of the flexible composite structure along the axial direction, pointing to the outside of the flexible composite structure, a clamping column is installed, and the bottom end of the clamping column is tightly connected to the flexible composite structure; with the clamping buckle as the center of the circle, a plurality of heat exchange fins are installed on the outside of the flexible composite structure; the bottom end of the heat exchange fin is tightly connected to the strip metal button; the strip metal button is tightly connected to the flexible composite structure.

2. A flexible and retractable heat pipe for thermal management according to claim 1, characterized in that: The flexible composite structure has an outer body made of a flexible and highly sealed material, such as rubber, PET film, etc.; the clamping column, heat exchange fins and strip metal buttons are made of highly thermally conductive hard materials, such as metal, carbon fiber materials, highly thermally conductive composite materials, etc., and can be elastically bent; the shell and the fixing ring buckle are tightly fastened by nano injection molding, hot melt riveting and other processes; the flexible composite structure and the fixing ring buckle are connected as a whole by hot melting, gluing, one-piece molding and other processes; the bottom end of the heat exchange fin and the strip metal button are tightly connected by welding, one-piece molding and other methods; the clamping column and the strip metal button are tightly connected with the flexible composite structure by vulcanization bonding, gluing, nano injection molding and other methods; the flexible capillary core covers the inner side of the fixing ring buckle and is in close contact with the capillary core inside the shell; the end cover and the shell can be tightly connected as a whole by welding and other methods.

3. A flexible and retractable heat pipe for thermal management according to claim 1, characterized in that: The end cover may not be installed, and the shell may be sealed at the end by extrusion welding, high-frequency heating sealing, one-piece molding, etc.; the clamping column may not be installed; the heat exchange fins may not be installed; and the strip metal button may not be installed.

4. The flexible and retractable heat pipe for thermal management according to claim 1, characterized in that: According to the circulation process of the liquid working medium in the accommodating cavity, the heat pipe is divided into an evaporating end, an insulating section and a condensing end. The evaporating end and the condensing end of the heat pipe are divided into a fixed type and a movable type. The fixed type evaporating end and the condensing end do not contain movable parts, and are composed of the shell and the end cover tightly connected; the movable type is composed of the shell, a fixed ring buckle and a flexible composite structure; the insulating section is the insulating section of the heat pipe and the sleeve, and the outer layer is coated with an insulating coating or installed with a thermal insulation layer to isolate external heat exchange.

5. A flexible and retractable heat pipe for thermal management according to claim 4, characterized in that: At least one of the evaporation end and the condensation end is movable.

6. The flexible and retractable heat pipe for thermal management according to claim 4, characterized in that: When the temperature of the heat pipe is lower than the heat pipe starting temperature, the movable type will shrink into the insulation section, the heat exchange fins will be engaged with the clamping column and also shrink into the insulation section, and the heat pipe will stop working.

7. The flexible and retractable heat pipe for thermal management according to claim 4, characterized in that: The movable evaporation end has a reserved heat absorption portion to ensure that the heat pipe can be started.

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