A flame-retardant, flexible, fireproof, and environmentally friendly power cable

Abstract

This invention discloses a flame-retardant, flexible, fire-resistant, and environmentally friendly power cable, relating to the field of power cable technology. The key technical points are: it includes a cable body and connecting reels sealed at both ends of the cable body for connecting the cable. The cable body, from the outside to the inside, sequentially comprises a rubber layer, an insulating layer, a metal armor layer, an inner lining layer, an anti-corrosion layer, a flame-retardant layer, an XLPE insulation layer, and a battery core. In this invention, the heat generated by the battery core is conducted to the gas and heat-conducting components within the internal heat dissipation cavity through a heat dissipation assembly. Heat exchange occurs between the connecting reel and the external air, reducing the probability of cable combustion. Simultaneously, when the cable burns, the generated heat causes the shape memory alloy to drive the inner tube to release the flame-retardant material within the film sheath of the heat-conducting component. This reaction produces gases that inhibit combustion, reducing the environmental impact of cable combustion.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power cables, more particularly, it relates to a flame-retardant flexible fireproof environment-friendly power cable. BACKGROUND

[0002] Cables are a collection of conductors used for transmitting power or information, usually composed of multiple conductors and their insulating materials, sheaths and shielding layers, widely used in power engineering, communication, transportation, construction and other fields, according to different application scenarios, and combined with characteristics, cables can be divided into waterproof cables, fireproof cables, shielded cables and optical fiber cables, etc.

[0003] Fireproof cables are a special design of cables designed to improve safety and performance in fire situations, playing a crucial role in ensuring the safety of buildings and facilities. Fireproof cables have certain differences in internal structure compared to other characteristic cables. The internal structure is based on achieving cable protection while also tending to fireproof performance, which is reflected in the use of special high-temperature-resistant materials or multi-level fireproof structures in the fireproof layer. The addition of high-temperature-resistant materials or multi-layer fireproof structures can greatly reduce the impact of heat on the cable itself and the cable during use.

[0004] Due to the sealed wrapping structure inside the cable, by changing the material and level, it can inhibit high temperature, reduce heat conduction, and some materials can also reduce the fire when the cable burns, thereby achieving protection of the cable. High-temperature-resistant materials are isolation layers that mainly have the effect of heat insulation, but cannot relieve the heat generated by the battery, and to some extent, cannot reduce the probability of burning caused by high temperature of the cable.

[0005] Therefore, in order to solve the above technical problems, the present application provides a flame-retardant flexible fireproof environment-friendly power cable. SUMMARY

[0006] In view of the deficiencies of the prior art, the purpose of the present application is to provide a flame-retardant flexible fireproof environment-friendly power cable.

[0007] In order to achieve the above object, the present application provides the following technical scheme: A kind of flame-retardant flexible fireproof environmental protection power cable, including cable body and sealing connection in the both ends of cable body, and be used to connect the connecting disc of cable body, the cable body is sequentially provided with rubber layer, isolation layer, metal armor layer, inner liner, corrosion protection layer, flame-retardant layer, XLPE insulation layer and electric core from outside to inside;Wherein, heat conducting piece is arranged between isolation layer and metal armor layer, and heat conducting piece is used to form a heat dissipation cavity between isolation layer and metal armor layer for heat conduction, the XLPE insulation layer is sequentially penetrated by heat dissipation assembly and is connected with the heat dissipation cavity in the communication structure, and the heat dissipation assembly is arranged in the circumferential direction and is used to conduct the heat of electric core.

[0008] Preferably, the heat conducting piece includes metal rods distributed in the heat dissipation cavity in the circumferential direction and connecting frames connected between the metal rods, the connecting frames are provided with film sleeves in the middle portions, the film sleeves are filled with flame-retardant materials for suppressing combustion, the heat conducting piece is provided with multiple groups, and the metal rods of the multiple groups are arranged in the heat dissipation cavity in a linear manner and are movably connected.

[0009] Preferably, the XLPE insulation layer is provided with an inner shielding layer between the XLPE insulation layer and the electric core, and the XLPE insulation layer is provided with multiple groups of heat conducting wires for heat conduction, and the multiple groups of heat conducting wires extend into the inner shielding layer.

[0010] Preferably, the heat dissipation assembly includes an outer tube and an inner tube, one end of the outer tube is embedded in the inside of the XLPE insulation layer and is wrapped by the multiple groups of heat conducting wires, the other end of the outer tube sequentially penetrates the flame-retardant layer, the corrosion protection layer, the inner liner, the metal armor layer and is connected with the heat dissipation cavity, the inner tube is movably connected with the outer tube, the bottom of the inner tube is connected with the outer tube by a threaded support, and the threaded support is made of a memory alloy.

[0011] Preferably, the outer tube is provided with multiple groups of slideways for limiting the sliding of the inner tube, the top and the bottom of the outer tube are in communication, and the bottom of the outer tube is provided with a support a for connecting the threaded support.

[0012] Preferably, the top and the bottom of the inner tube are in communication, and the top and the bottom of the inner tube are respectively provided with star-shaped blades and a support b connected with the threaded support, the outer wall of the inner tube is provided with through holes and balls corresponding to the positions of the slideways.

[0013] Preferably, the through holes are provided with multiple groups, the multiple groups of through holes are located at the top side of the inner tube, the multiple groups of through holes are distributed in the circumferential direction, and the number of the multiple groups of through holes is arranged in an increasing manner from top to bottom.

[0014] Preferably, the star-shaped blade is composed of a plurality of triangular structure blades arranged in a circle, the blade edge of the star-shaped blade is located on the hypotenuse of the triangular structure blade, and corresponds to the position of the film sleeve.

[0015] Preferably, a protective layer in a mesh shape for blocking heat transfer is arranged between the rubber layer and the isolation layer, and the film sleeve has a strip structure as a whole and matches the arc structure of the connecting frame.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] 1. The cable forms a heat dissipation cavity inside the cable through the arrangement of the internal heat conducting member, and the heat generated by the battery can be conducted to the gas and the heat conducting member in the heat dissipation cavity through the heat dissipation assembly which is in communication with the heat dissipation cavity and penetrates the XLPE insulation layer, and the heat can be transferred to the connecting disc at both ends of the cable body through the gas and the heat conducting member, and the heat exchange between the connecting disc and the external air, thereby relieving the heat generated inside the cable to a certain extent and effectively reducing the probability of cable combustion caused by excessive heat inside the cable.

[0018] 2. The heat dissipation assembly inside the cable adopts a double-pipe structure, and the inner pipe is driven by the force generated during the adaptive deformation process of the memory alloy under the influence of heat, and when the cable burns, the heat generated will drive the memory alloy to release the flame-retardant material in the film sleeve on the heat conducting member, and through the decomposition of the flame-retardant material at high temperature, a gas for inhibiting combustion is generated, thereby reducing the influence of cable combustion on the environment.

[0019] 3. The heat conducting member inside the cable adopts a ring-shaped metal connecting structure as a whole, and the active connection form is adopted between multiple heat conducting members, so that the cable has toughness and also enhances the resistance of the cable. DETAILED DESCRIPTION

[0020] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0021] Figure 1 It is the overall appearance of the cable in the present application;

[0022] Figure 2 It is the structure diagram of the cable body in the present application;

[0023] Figure 3 It is the structure diagram between the rubber layer and the isolation layer in the present application;

[0024] Figure 4 It is the connection diagram of the heat dissipation assembly in the present application;

[0025] Figure 5 This is a structural diagram of the heat-conducting component in this invention;

[0026] Figure 6 In this invention Figure 5 Enlarged view of point A;

[0027] Figure 7 This is a structural diagram of the outer tube of the heat dissipation component in this invention;

[0028] Figure 8 This is a diagram showing the inner tube connection of the heat dissipation assembly in this invention;

[0029] Figure 9 This is a partial view of the internal pipe connection of the heat dissipation component in this invention;

[0030] Figure 10 This is a connection diagram of the XLPE insulation layer and the heat dissipation component in Embodiment 2 of the present invention.

[0031] 1. Cable body; 2. Connecting disc; 3. Rubber layer; 4. Insulation layer; 5. Metal armor layer; 6. Inner lining layer; 7. Anti-corrosion layer; 8. Flame retardant layer; 9. XLPE insulation layer; 901. Heat-conducting wire; 902. Metal ring; 10. Battery core; 11. Heat dissipation cavity; 12. Metal rod; 13. Connecting frame; 14. Membrane sleeve; 15. Heat dissipation assembly; 16. Outer tube; 1601. Slide rail; 1602. Bracket a; 17. Inner tube; 1701. Star blade; 1702. Through hole; 1703. Ball bearing; 1704. Bracket b; 18. Threaded support; 19. Inner shielding layer; 20. Protective layer. Detailed Implementation

[0032] Example 1

[0033] like Figures 1-9 As shown, the present invention provides a flame-retardant flexible fireproof and environmentally friendly power cable, including a cable body 1 and a connecting plate 2 sealed to both ends of the cable body 1 and used to connect the cable body 1. The cable body 1 is provided with a rubber layer 3, an isolation layer 4, a metal armor layer 5, an inner lining layer 6, an anti-corrosion layer 7, a flame-retardant layer 8, an XLPE insulation layer 9 and a battery core 10 from the outside to the inside.

[0034] A heat-conducting component is provided between the isolation layer 4 and the metal armor layer 5, and a heat dissipation cavity 11 for heat conduction is formed between the isolation layer 4 and the metal armor layer 5 through the heat-conducting component. Multiple sets of heat dissipation components are arranged on the XLPE insulation layer 9 in a circular pattern to conduct heat to the battery cell 10, and a heat dissipation component 15 is connected to the flame retardant layer 8, the anti-corrosion layer 7, the inner lining layer 6, the metal armor layer 5 and the heat dissipation cavity 11 in sequence.

[0035] Specifically, such as Figure 1As shown, the connecting plate 2 is a connector for splicing and assembling the cable body 1. On the one hand, it needs to ensure the sealing of the connection with the cable body 1, and on the other hand, it needs to ensure that the connecting plate 2 is in contact with the heat dissipation cavity 11. Therefore, the connecting plate 2 is nested and wrapped around both ends of the cable body 1, and adopts an external sealing form. The center of the connecting plate 2 has a connection hole for the power supply core 10 and the XLPE insulation layer 9. The rubber layer 3, isolation layer 4, metal armor layer 5, inner lining layer 6, anti-corrosion layer 7, and flame retardant layer 8 of the cable body 1 are all in a limited and contacting state with the connecting plate 2. When connecting the cables, the connecting plates 2 can be fixed by the sealing ring and screws. This is the node of the cable connection.

[0036] like Figure 2 As shown, the rubber layer 3 inside the cable body 1 can be made of natural rubber, synthetic rubber or polyurethane rubber, etc., as the outer protective layer of the cable, depending on the specific usage scenario.

[0037] The isolation layer 4 is a wrap-around fabric layer, which can be either rock wool fabric or silicone cloth. Due to the heat-conducting component, a heat dissipation cavity 11 is formed between the isolation layer 4 and the metal armor layer 5. Air is present in the cavity. When the air is heated, a certain pressure will be generated, and the heat dissipation cavity 11 will expand. The flexible material combined with the extensibility of the rubber layer 3 can play a buffering role to a certain extent. Both rock wool fabric and silicone cloth have good high temperature resistance, fire resistance and heat insulation properties. While playing an extensibility and adaptability role, they also block the heat conduction from affecting the rubber layer 3. In order to further improve the heat insulation effect, a mesh-like protective layer 20 is set between the rubber layer 3 and the isolation layer 4 to block heat transfer. The protective layer 20 is preferably glass fiber, but it can also be polystyrene foam. When glass fiber is selected, the filamentous glass fiber can be woven into a mesh structure and covered between the rubber layer 3 and the isolation layer 4.

[0038] In order to achieve the best heat exchange effect of the heat dissipation cavity 11, due to the problem of low thermal conductivity of air, an appropriate amount of inert gas with high thermal conductivity, such as helium or xenon, can be filled into the heat dissipation cavity 11 to improve the heat exchange efficiency.

[0039] The metal armor layer 5 mainly provides protection for all the hierarchical structures inside the heat dissipation cavity 11. The metal armor is made of metal, which can be any of steel, aluminum or stainless steel. Since metal has high thermal conductivity, a protective layer 20 structure such as the glass fiber mesh mentioned above can be added between the metal armor layer 5 and the inner lining layer 6.

[0040] The inner lining layer 6 mainly serves as external insulation and protection. Materials with good insulation, such as PVC and PE, can be selected based on the actual application of the cable.

[0041] The anti-corrosion layer 7 also serves to protect the inside of the cable. This layer can also be a reinforcement and protective layer for the inner lining layer 6. It can be made of materials such as PVC or PE as mentioned above. If the protective effect is further improved, this layer can be made of aluminum foil or lead, which can provide anti-corrosion, physical protection and electromagnetic shielding for the cable.

[0042] Flame-retardant layer 8 is a fireproof layer, which is made of high-temperature resistant materials, such as flame-retardant fibers, including flame-retardant acrylic or flame-retardant polyester; inorganic flame-retardant materials, including aluminum hydroxide, magnesium hydroxide and phosphates; in addition to the above, PVC, PE and other materials with flame-retardant properties can also be used.

[0043] The XLPE insulation layer 9 is an insulating material that directly protects the battery cell 10. XLPE has high rigidity and hardness in the solid state. Compared with uncrosslinked polyethylene (PE), the crosslinked structure of XLPE makes it more robust and durable, providing stable electrical performance and mechanical protection, while also having high temperature resistance.

[0044] Based on the above, an inner shielding layer 19 is also provided between the XLPE insulation layer 9 and the battery cell 10. This layer directly protects the battery cell 10. Considering the thermal conductivity issue, thermally conductive silicone or thermally conductive composite materials with added conductive fillers can be used. Thermally conductive composite materials are made of metal and polymer or graphite materials, etc.

[0045] In order to directly guide the heat generated by cell 10, such as Figure 2 , Figure 4 As shown, multiple sets of heat-conducting wires 901 are provided inside the XLPE insulation layer 9 for heat conduction. The multiple sets of heat-conducting wires 901 extend into the inner shielding layer 19 and do not contact the battery cell 10. When the heat-conducting wires 901 do not penetrate the inner shielding layer 19, the inner shielding layer 19 will provide an overall wrapping effect for the battery cell 10. The heat generated by the battery cell 10 will be transferred to the inner shielding layer 19 and then directly conducted to the heat-conducting wires 901. The heat-conducting wires 901 are metal wires and can be any of copper wire, silver wire, or iron wire.

[0046] As for the 901 heat conductor, such as Figure 4 As shown, multiple sets of heat-conducting wires 901 can ensure the comprehensive conduction of heat dissipation from the battery cell 10 and the comprehensive conduction of heat dissipation component 15, while also serving to secure the heat dissipation component 15.

[0047] like Figure 4 , Figure 7 , Figure 8 and Figure 9As shown, the heat dissipation assembly 15 includes an outer tube 16 and an inner tube 17. One end of the outer tube 16 is embedded inside the XLPE insulation layer 9 and is wrapped by multiple sets of heat-conducting wires 901. The other end of the outer tube 16 passes through the flame-retardant layer 8, the anti-corrosion layer 7, the inner lining layer 6, and the metal armor layer 5 in sequence, and is connected to the heat dissipation cavity 11. The inner tube 17 is slidably connected to the outer tube 16. The bottom of the inner tube 17 is connected to the outer tube 16 through a threaded support member 18. The threaded support member 18 is a shape memory alloy.

[0048] Specifically, the heat dissipation assembly 15 moves the inner tube 17 a corresponding distance via the threaded support 18 according to different temperatures. For the movement of the inner tube 17, a shape memory alloy with a threaded structure inside the outer tube 16 is used. The shape memory alloy deforms at different temperatures, and the force generated during the deformation process drives the inner tube 17 to move. Through the contact area between the inner tube 17 and the gas in the heat dissipation cavity 11, heat exchange of different degrees is achieved. The threaded shape memory alloy is convenient to extend and retract, and can be limited by the outer tube 16. At the same time, it can also effectively ensure the extension ratio of the shape memory alloy before and after deformation. The shape memory alloy is made of nickel-titanium alloy, and the shape memory temperature is between 40℃ and 100℃. Therefore, the threaded support 18 can be adapted to the different heat generated by the battery cell 10, thereby adjusting the position of the inner tube 17.

[0049] At the same time, such as Figure 7 As shown, the inner wall of the outer tube 16 is provided with multiple sets of slide rails 1601 for sliding and limiting the inner tube 17. The top and bottom of the outer tube 16 are connected, and the bottom of the outer tube 16 is provided with a bracket a1602 for connecting the threaded support member 18.

[0050] like Figure 8 and Figure 9 The top and bottom of the inner tube 17 are connected, and star-shaped blades 1701 and brackets b1704 connected to threaded support 18 are respectively provided at the top and bottom of the inner tube 17. Through holes 1702 and ball bearings 1703 corresponding to the position of slide 1601 are provided on the outer wall of the inner tube 17.

[0051] Among them, there are multiple sets of through holes a1702, which are located on the top side of the inner tube 17. The multiple sets of through holes a1702 are all circumferentially distributed, and the number of multiple sets of through holes a1702 increases from top to bottom. This is mainly to adapt to the gas flow in the heat dissipation cavity 11 at different temperatures and the contact area with it, thereby improving the uniformity and comprehensiveness of heat transfer.

[0052] Furthermore, the inner tube 17 ensures smooth movement and precise positioning through a limiting sliding mechanism. Both brackets a1602 and b1704 adopt a multi-segment circumferential distribution to facilitate heat conduction and simultaneously achieve the purpose of connecting the threaded support 18. The star-shaped blade 1701 is used to pierce the membrane sleeve 14 on the connecting frame 13 when the cable is burning and the threaded support 18 is under extreme tension, thereby releasing the flame-retardant material inside the membrane sleeve 14 used to suppress combustion.

[0053] The star-shaped blade 1701 is composed of multiple triangular blades arranged in a circle. The cutting edge of the star-shaped blade 1701 is located on the hypotenuse of the triangular blades and corresponds to the position of the membrane sleeve 14. The cutting edge is set at an angle. Figure 8 As shown, after the central tip of the star-shaped blade 1701 pierces the membrane sleeve 14, it will continue to enter the membrane sleeve 14. The inclined blade and the membrane sleeve 14 will form a cutting effect, which will cause the flame retardant material inside the membrane sleeve 14 to be released quickly.

[0054] To achieve better heat exchange performance, such as Figure 2 , Figure 5 and Figure 6 As shown, the heat-conducting component includes metal rods 12 distributed circumferentially in the heat dissipation cavity 11 and an arc-shaped connecting frame 13 connected between multiple sets of metal rods 12. A membrane sleeve 14 is provided on the middle part of the connecting frame 13.

[0055] Specifically, the metal rods 12 are made of copper, aluminum, or other metals with high thermal conductivity. The circumferentially distributed metal rods 12 are connected by a connecting frame 13 to form a set of heat-conducting components. The connecting frame 13 can be a rod body fused into a single piece of metal or high-temperature resistant PVC. It is fixed and connected by screws and other connectors. The difference between the different materials is that when the connecting frame 13 is made of metal, the overall heat exchange efficiency of the heat-conducting components is high. At the same time, the material selection for the membrane sleeve 14 needs to be a high-temperature resistant membrane. If high-temperature resistant PVC is selected, the range of material selection for the membrane sleeve 14 will be wider. In addition, if a metal connecting frame 13 is selected, it will form an integrated support structure with the metal rods 12, which can improve the resistance of the cable.

[0056] Regarding the arrangement of heat-conducting components within the heat dissipation cavity 11, such as Figure 5 As shown, multiple sets of heat-conducting components are arranged linearly within the heat dissipation cavity 11. The metal rods 12 of the multiple sets of heat-conducting components are connected movably. Considering the overall heat exchange effect and the overall bending of the cable, the metal rods 12 of each set of heat-conducting components can adopt a movable connection structure such as a spherical component, so that the heat-conducting components can be moved and limited relative to each other, and can adapt to the adjustment of the overall bending of the cable. For the selection of movable connection structure, for example, the spherical component includes the limiting fit between the ball head and the ball cover, and multiple sets of metal rods 12 can also be connected by a chain.

[0057] In order to suppress combustion when the cable catches fire, such as Figure 2 , Figure 5 and Figure 6 As shown, the membrane sleeve 14 is filled with flame-retardant material for inhibiting combustion. The membrane sleeve 14 can be made of PET film. The membrane sleeve 14 has a strip-shaped structure and matches the arc-shaped structure of the connecting frame 13.

[0058] Specifically, the film sleeve 14 can be made of a high-temperature resistant film, not limited to PET film. It has a through-structure with the connecting frame 13 and is nested in a ring structure on the connecting frame 13 using fasteners such as clips. The flame-retardant material filled inside the film sleeve 14 is a flame-retardant material that decomposes at high temperatures to produce carbon dioxide, including sodium bicarbonate or some metal carbonates. For example, sodium bicarbonate has a decomposition temperature range of 50℃-100℃, making it more suitable for applications where cables may ignite. Meanwhile, when the cable catches fire, the shape memory alloy of the thread structure will also reach its maximum extension. The star-shaped blade 1701 will pierce the membrane sleeve 14 to release flame-retardant material, which will inhibit the combustion to a certain extent through the reaction.

[0059] In summary, this cable, through the design of a heat-conducting component, forms a heat dissipation cavity 11 between the internal insulation layer 4 and the metal armor layer 5, which can alleviate the heat inside the cable. This is complemented by a heat dissipation component 15 that penetrates into the XLPE insulation layer 9 and communicates with the heat dissipation cavity 11. Heat is transferred to the gas and metal rod 12 within the heat dissipation cavity 11 via thermal conduction. Finally, the heat is transferred to the connecting plate 2, where it exchanges heat with the external air, thus alleviating the high temperature inside the cable to some extent. Furthermore, in the event of combustion, after the shape memory metal is fully deformed, the heat dissipation component 15 punctures the membrane sheath 14 through the star-shaped blade 1701 on the inner tube 17, releasing a flame retardant. The carbon dioxide generated by the high-temperature decomposition reaction of the flame retardant effectively inhibits combustion, thereby improving the cable's fire resistance.

[0060] Example 2

[0061] like Figure 10As shown, the difference from Embodiment 1 is that the heat-conducting wire 901 located in the XLPE insulation layer 9 is replaced by a ring-shaped heat-conducting metal, namely a metal ring 902. Copper is the best material for the metal ring 902, but other heat-conducting metals with a hard texture can also be used. The end of the metal ring 902 embedded in the XLPE insulation layer 9 is integrated with the outer tube 16 of the heat dissipation assembly 15. The other end of the metal ring 902 extends into the inner shielding layer 19 and does not contact the battery cell 10. Compared with the heat-conducting wire 901 in Embodiment 1, the metal ring 902 is directly connected to the heat dissipation assembly 15, which further improves the firmness and stability of the connection between the heat dissipation assembly 15 and the XLPE insulation layer 9. At the same time, the heat conduction effect of the metal ring 902 is more direct than that of the heat-conducting wire 901.

[0062] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Those skilled in the art can readily implement the invention based on the accompanying drawings and the description above. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the present invention, using the disclosed technical content, are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A flame retardant flexible fire resistant environmentally friendly power cable, characterized in that, The utility model provides a cable, including cable body (1) and the connecting disc (2) for connecting cable body (1) are sealedly connected to both ends of cable body (1) and are used to carry out the connection of cable body (1), the cable body (1) is arranged with rubber layer (3), isolation layer (4), metal armoring layer (5), inner liner (6), anticorrosive layer (7), fire -retardant layer (8), XLPE insulation layer (9) and electric core (10) gradually from outside to inside, Wherein, the isolation layer (4) and the metal armoring layer (5) between the heat conducting piece is arranged, and the isolation layer (4) and the metal armoring layer (5) between the heat conducting piece makes the isolation layer (4) and the metal armoring layer (5) form a heat dissipation cavity (11) for heat conduction, the XLPE insulation layer (9) on the circumference is provided with a plurality of heat conducting groups for the electric core (10), and sequentially penetrates the fire -retardant layer (8), anticorrosive layer (7), inner liner (6), metal armoring layer (5) and the heat exhaust assembly (15) of the heat dissipation cavity (11) in the communication structure, The heat conducting piece includes the metal rod (12) in the heat dissipation cavity (11) and the connecting frame (13) between the metal rod (12), the connecting frame (13) is arranged in the middle part of the film sleeve (14), the film sleeve (14) is filled with the fire -retardant material for inhibiting combustion, the heat conducting piece is provided with a plurality of and is arranged in the heat dissipation cavity (11) in linear, and the metal rod (12) between the plurality of heat conducting pieces is movably connected, The XLPE insulation layer (9) and the electric core (10) between the inner shield layer (19) are provided, the XLPE insulation layer (9) is provided with a plurality of heat conducting wires (901) for heat conduction in the inside, and the plurality of heat conducting wires (901) extend to the inner shield layer (19) in, The heat exhaust assembly (15) includes the outer tube (16) and the inner tube (17), one end of the outer tube (16) is embedded in the inside of the XLPE insulation layer (9), and is wrapped by a plurality of heat conducting wires (901), the other end of the outer tube (16) sequentially penetrates the fire -retardant layer (8), anticorrosive layer (7), inner liner (6), metal armoring layer (5), and is communicated with the heat dissipation cavity (11), the inner tube (17) is slidably connected with the outer tube (16), the inner tube (17) is connected with the outer tube (16) through the threaded support (18) arranged at the bottom, and the threaded support (18) is a memory alloy.

2. A fire-retardant flexible fire resistant environment friendly power cable as claimed in claim 1, wherein: The inner wall of the outer tube (16) is provided with a plurality of slide ways (1601) for limiting the sliding of the inner tube (17), the top and bottom of the outer tube (16) are in communication, and the bottom of the outer tube (16) is provided with a support a (1602) for connecting the threaded support (18).

3. A fire-retardant flexible fire resistant environmentally friendly power cable as claimed in claim 2, characterized in that: The top and bottom of the inner tube (17) are in communication, and the top and bottom of the inner tube (17) are respectively provided with a star blade (1701) and a support b (1704) connected with the threaded support (18), and the outer wall of the inner tube (17) is provided with a through hole (1702) and a ball (1703) corresponding to the slide way (1601).

4. A fire-retardant flexible fire resistant environmentally friendly power cable as claimed in claim 3, characterized in that: The through holes (1702) are provided in multiple groups, the multiple groups of through holes (1702) are located at the top side of the inner tube (17), the multiple groups of through holes (1702) are circumferentially distributed, and the number of the multiple groups of through holes (1702) is arranged in an increasing manner from top to bottom.

5. A fire-retardant flexible fire resistant eco-friendly power cable as claimed in claim 3, wherein: The star-shaped blade (1701) is composed of a plurality of triangular structure blades arranged in a circle, and the cutting edge of the star-shaped blade (1701) is located on the hypotenuse of the triangular structure blade.

6. A fire-retardant flexible fire resistant eco-friendly power cable as claimed in claim 1, wherein: The rubber layer (3) and the isolation layer (4) are provided with a protective layer (20) in a mesh shape and used for blocking heat transfer, and the film sleeve (14) is in a strip structure as a whole and is matched with the arc structure of the connecting frame (13).

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