Environment-friendly waterproof low-smoke halogen-free flame-retardant cable

Abstract

The invention discloses an environment-friendly waterproof low-smoke halogen-free flame-retardant cable, and relates to the technical field of flame-retardant cables, the outer side of a center conductor is coated with an internal insulating layer, the outer side of the internal insulating layer is jointly coated with a silica gel protective layer, the outer side of the silica gel protective layer is sequentially coated with an internal shielding layer and a rubber protective outer layer, and the outer side of the rubber protective outer layer is coated with a rubber protective outer layer. According to the flame-retardant cable, gas generated by the sodium bicarbonate tablet is matched with blasting impact generated by the heat-resistant elastic silicon capsule, so that the process that flame spreads along the outer side of the cable can be quickly blocked, and then the fireproof performance of the flame-retardant cable is effectively improved; meanwhile, when the flame-retardant cable is located in the flame for a long time, the loose porous structure generated by the porous fireproof expansion adhesive tape can be utilized to guide and restrain carbon dioxide and water vapor generated by the sodium bicarbonate tablet, so that a flame-retardant fireproof isolation belt is formed on the outer side of the flame-retardant cable, and the fireproof performance of the flame-retardant cable is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flame-retardant cables, in particular to an environmentally-friendly waterproof low-smoke halogen-free flame-retardant cable. BACKGROUND

[0002] The environmentally-friendly waterproof low-smoke halogen-free flame-retardant cable is a special cable with the five core characteristics of environmental protection, waterproof, low smoke, halogen-free and flame retardant, and is mainly used in scenes with strict requirements for safety, environmental protection and waterproof (such as buildings, rail transit, new energy, ships, underground engineering, etc.). Therefore, a kind of environmentally-friendly waterproof low-smoke halogen-free flame-retardant cable is disclosed in Chinese patent CN202410297899.1. The cable does not pollute the soil and water source during use and disposal, and the mouse is safe and sound under the specified test conditions after passing the harsh toxicity test. However, the current flame-retardant cable is limited by its internal structure during use, so that the cable can only rely on the material of its own protective layer for flame retardation, which leads to the fact that the flame-retardant cable cannot block the flame spreading along the cable in a fire, thereby reducing the environmental adaptability of the flame-retardant cable and the service life of the flame-retardant cable. SUMMARY

[0003] The present application provides an environmentally-friendly waterproof low-smoke halogen-free flame-retardant cable, which can effectively solve the problem of the flame-retardant cable being limited by its internal structure during use, so that the cable can only rely on the material of its own protective layer for flame retardation, which leads to the fact that the flame-retardant cable cannot block the flame spreading along the cable in a fire, thereby reducing the environmental adaptability of the flame-retardant cable and the service life of the flame-retardant cable.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: an environmentally-friendly waterproof low-smoke halogen-free flame-retardant cable, comprising a center conductor, an internal insulation layer is coated outside the center conductor, a silica gel protective layer is collectively coated outside the internal insulation layer, an internal shielding layer and a rubber protective outer layer are sequentially coated outside the silica gel protective layer; An external dynamic impact fireproof mechanism is arranged outside the rubber protective outer layer, which is used for protecting the outside of the cable to prevent the flame from spreading along the cable; The external dynamic impact fireproof mechanism comprises an external waterproof isolation sleeve; The rubber protective outer layer is coated with an external waterproof isolation sleeve, the external waterproof isolation sleeve is coated with an external protective sleeve, and arc-shaped wide grooves and arc-shaped narrow grooves are staggered on the outside of the external protective sleeve; A heat insulation installation soft strip is arranged inside the arc-shaped narrow groove, a porous fireproof expansion adhesive strip is filled inside the heat insulation installation soft strip, and a circular installation embedding groove is formed on the outside of the porous fireproof expansion adhesive strip. The circular mounting groove is internally inlaid with an internal mounting circular box, the internal mounting circular box is internally filled with sodium bicarbonate tablets, the internal mounting circular box is internally and medially connected with a central heat-conducting column, one end of the central heat-conducting column is fixedly connected with a positioning and compressing circular sheet, and the internal mounting circular box is externally bonded with a heat-resistant and elastic silica gel capsule.

[0005] Preferably, the arc-shaped wide grooves and the arc-shaped narrow grooves are alternately arranged, the outer side of the heat insulation mounting soft strip is tightly attached to the inner wall of the arc-shaped narrow groove, the outer arc surface of the outer side of the porous fireproof and expansion adhesive strip is flush with the outer arc surface of the outer protective sleeve, and fine holes are formed on the outer side of the porous fireproof and expansion adhesive strip.

[0006] Preferably, the sodium bicarbonate tablets are decomposed into sodium carbonate, water vapor and carbon dioxide after being heated, the central heat-conducting column and the positioning and compressing circular sheet are made of copper, and a plurality of air holes are formed on the outer side of the positioning and compressing circular sheet in the circumferential direction.

[0007] Preferably, a sealing and protective strip is wrapped around the outer side of the porous fireproof and expansion adhesive strip, and a heat dissipation silica gel sheet is embedded and mounted on the outer side of the sealing and protective strip in the axial direction. The arc-shaped wide grooves are internally embedded with an isolation and buffer adhesive strip, the isolation and buffer adhesive strip is internally and medially embedded with a central reinforcing rib, and buffer long strip air bags are embedded and mounted on both sides of the isolation and buffer adhesive strip. The outer side of the protective side strip is wrapped around the outer side of the isolation and buffer adhesive strip.

[0008] Preferably, the outer arc surface of the heat dissipation silica gel sheet is flush with the outer arc surface of the sealing and protective strip, and heat dissipation stripes are evenly arranged on the outer side of the heat dissipation silica gel sheet.

[0009] Preferably, the outer side of the isolation and buffer adhesive strip is tightly attached to the inner wall of the arc-shaped wide groove, the buffer long strip air bags are filled with inert gas, and the buffer long strip air bags are shrunk in volume after being extruded.

[0010] Preferably, the outer arc surfaces of the sealing and protective strip and the protective side strip are flush with each other, the sealing and protective strip and the protective side strip are connected by adhesive, and the sealing and protective strip and the protective side strip are made of the same rubber material.

[0011] Preferably, an internal communication type buffer protection mechanism is arranged in the silica gel protective layer, and the internal communication type buffer protection mechanism is used for buffering the impact received by the flame-retardant cable to ensure the structural stability of the flame-retardant cable. The internal communication type buffer protection mechanism comprises a central mounting cord. The middle part of the inner side of the silica gel protective layer is provided with a center mounting cable, the outer side of the center mounting cable is provided with equidistantly inserted triangular buffer strips, and the outer side of the triangular buffer strips is correspondingly bonded with buffer fan-shaped capsules at the position of the outer side of the internal insulation layer; The outer side of the center mounting cable is provided with equidistantly sleeved isolation silica gel plates at the positions of the ends of the triangular buffer strips and the buffer fan-shaped capsules. The inner ends of the triangular buffer strips are fixedly connected with isolation liquid guiding soft capsules, the end faces of the isolation liquid guiding soft capsules are provided with liquid guiding inner grooves, the middle part of the inner side of the triangular buffer strips is filled with a center support cotton block, and the end faces of the inner cavities of the triangular buffer strips are bonded with end buffer air bags.

[0012] Preferably, the buffer fan-shaped capsules are tightly and slidably attached between the outer side of the buffer fan-shaped capsules and the outer side of the internal insulation layer, and the buffer fan-shaped capsules are filled with insulation heat-conducting oil.

[0013] Preferably, the isolation liquid guiding soft capsules and the inner cavities of the triangular buffer strips are connected with each other through connecting pipes, and the isolation liquid guiding soft capsules and the triangular buffer strips are filled with insulation heat-conducting oil.

[0014] Compared with the prior art, the present application has the following advantages: 1. The external dynamic impact fireproof mechanism is provided, the mutual cooperation between the internal components of the external dynamic impact fireproof mechanism optimizes the fire-retardant performance of the fire-retardant cable, the explosion impact generated by the gas generated by the sodium bicarbonate tablet and the explosion impact generated by the heat-resistant elastic silica gel capsule can quickly block the process of flame spreading along the outer side of the cable, thereby effectively improving the fireproof performance of the fire-retardant cable, and when the fire-retardant cable is located in the flame for a long time, the loose porous structure generated by the porous fireproof expansion adhesive tape can guide and constrain the carbon dioxide and water vapor generated by the sodium bicarbonate tablet to form a fire-retardant fireproof isolation belt outside the fire-retardant cable, thereby further improving the fireproof performance of the fire-retardant cable. Meanwhile, the components are assembled to the outer side of the fire-retardant cable through the arc groove wide groove and the arc narrow groove, and the outer side of the fire-retardant cable is directionally heat-insulated through the heat-insulating mounting soft strip, thereby ensuring that the fire-retardant cable can still maintain stable operation performance during continuous use, and the combination structure design of the components in the arc groove wide groove and the arc narrow groove makes it more convenient to replace the components during subsequent maintenance and repair, thereby further improving the use safety and convenience of the fire-retardant cable, the shrinkage deformation of the buffer strip air bag in the isolation buffer adhesive strip buffers the impact in the circumferential direction, the overall structural strength of the isolation buffer adhesive strip is strengthened through the center reinforcing rib, and the normal operation of the impact fire extinguishing is further ensured.

[0015] 2. Set the internal communication type buffer protection mechanism, through the internal communication type buffer protection mechanism between the internal components of each other, effectively improve the overall structure strength of the flame retardant cable inside, through the double communication extension structure inside the triangular buffer long strip and the buffer fan-shaped capsule, when the cable is impacted and extruded outside, through the axial flow of the insulating heat conducting oil inside the buffer fan-shaped capsule, and the flow between the insulating heat conducting oil between the triangular buffer long strip and the isolation liquid guide soft bag, the impact on the flame retardant cable is transferred and consumed, and the center conductor is supported by the transfer of the insulating heat conducting oil, to further improve the fixed stability of the flame retardant cable during use, and improve the overall structure strength of the flame retardant cable; At the same time, the insulating heat conducting oil inside the triangular buffer long strip and the buffer fan-shaped capsule can assist the heat dissipation inside the flame retardant cable, so that the flame retardant cable can still maintain good heat dissipation performance during long time use, and the expansion and contraction characteristics of the end buffer air bag can buffer and consume the slight extrusion of the flame retardant cable, improve the resistance of the flame retardant cable to periodic weak extrusion impact, reduce the degree of fatigue and wear of the internal components of the flame retardant cable, and indirectly improve the service life of the flame retardant cable.

[0016] In summary, through the mutual cooperation between the internal components of the external dynamic impact fireproof mechanism and the internal communication type buffer protection mechanism, the flame retardant cable is deformed after being burned, the single breaking impact of the heat-resistant elastic silica gel capsule on the flame on the cable is extinguished, the loose structure of the porous fireproof expansion adhesive tape after burning can guide and temporarily constrain the continuous release of carbon dioxide and water vapor from sodium bicarbonate tablets, so as to further improve the fireproof performance of the flame retardant cable, and the expansion and contraction structure inside the triangular buffer long strip and the buffer fan-shaped capsule can buffer the impact on the cable, thereby effectively improving the extrusion resistance of the flame retardant cable, and the expansion and contraction of the buffer fan-shaped capsule can buffer the impact of the explosion of the heat-resistant elastic silica gel capsule on the side of the installation round box, thereby ensuring the stability of the internal structure of the flame retardant cable during fireproofing, further improving the use safety of the flame retardant cable, and effectively improving the service life of the flame retardant cable. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings are used to provide further understanding of the present application, and constitute a part of the specification, together with the embodiments of the present application, to explain the present application, and do not constitute a limitation on the present application.

[0018] In the drawings: Figure 1 is a structural schematic diagram of the present application; Figure 2 is a structural schematic diagram of the installation of the porous fireproof expansion adhesive tape of the present application; Figure 3This is a schematic diagram of the end face of the present invention; Figure 4 This is a schematic diagram of the structure for installing the heat-resistant elastic silicon capsule of the present invention; Figure 5 This is a structural schematic diagram of the external dynamic impact fireproof mechanism of the present invention; Figure 6 This is a schematic diagram of the structure for installing the positioning and clamping disc of the present invention; Figure 7 This is a schematic diagram of the structure for installing the sodium bicarbonate tablets of the present invention; Figure 8 This is a schematic diagram of the internal interconnected buffer protection mechanism of the present invention; Figure 9 This is a schematic diagram of the structure for installing the central support cotton block in this invention; The diagram shows: 1. Center conductor; 2. Inner insulation layer; 3. Silicone protective layer; 4. Inner shielding layer; 5. Rubber protective outer layer. 6. External dynamic impact fireproof mechanism; 601. External waterproof isolation sleeve; 602. External protective sleeve; 603. Wide arc groove; 604. Narrow arc groove; 605. Thermal insulation mounting strip; 606. Porous fireproof expansion strip; 607. Circular mounting groove; 608. Mounting round box; 609. Sodium bicarbonate sheet; 610. Central heat-conducting column; 611. Positioning and clamping round piece; 612. Heat-resistant elastic silicone capsule; 613. Sealing and protective strip; 614. Heat-dissipating silicone sheet; 615. Isolation and buffer strip; 616. Central reinforcing rib; 617. Buffer strip airbag; 618. Protective side strip; 7. Internally connected buffer protection mechanism; 701. Central mounting cable; 702. Triangular buffer strip; 703. Buffer fan-shaped bladder; 704. Isolation silicone plate; 705. Isolation fluid guiding soft bladder; 706. Fluid guiding inner channel; 707. Central support cotton block; 708. End buffer airbag. Detailed Implementation

[0019] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0020] Example: Figures 1-9 As shown, the present invention provides a technical solution, an environmentally friendly and waterproof low-smoke halogen-free flame-retardant cable, including a center conductor 1, an inner insulation layer 2 tightly wrapped around the outside of the center conductor 1, a silicone protective layer 3 wrapped around the outside of the inner insulation layer 2, an inner shielding layer 4 disposed outside the silicone protective layer 3, and a rubber protective outer layer 5 tightly wrapped around the outside of the inner shielding layer 4. An external dynamic impact fireproof mechanism 6 is provided on the outside of the rubber protective outer layer 5. The external dynamic impact fireproof mechanism 6 is used to protect the outside of the cable to prevent the flame from spreading along the cable. The external dynamic impact fireproof mechanism 6 includes an external waterproof isolation sleeve 601, an external protective sleeve 602, an arc-shaped wide groove 603, an arc-shaped narrow groove 604, a heat-insulating mounting strip 605, a porous fireproof expansion strip 606, a circular mounting groove 607, a mounting round box 608, a sodium bicarbonate pressure plate 609, a central heat-conducting column 610, a positioning and clamping round piece 611, a heat-resistant elastic silicone capsule 612, a sealing and protective strip 613, a heat-dissipating silicone sheet 614, an isolation and buffer strip 615, a central reinforcing rib 616, a buffer strip airbag 617, and a protective side strip 618. The outer rubber protective layer 5 is tightly covered with an outer waterproof isolation sleeve 601. The outer waterproof isolation sleeve 601 is tightly covered with an outer protective sleeve 602. An arc-shaped wide groove 603 is opened on the outer side of the outer protective sleeve 602 along the circumferential direction. An arc-shaped narrow groove 604 is opened on the outer side of the outer protective sleeve 602 along the circumferential direction at the position corresponding to the arc-shaped wide groove 603. The interior of the arc-shaped narrow groove 604 is lined with a heat-insulating installation strip 605, and the interior of the heat-insulating installation strip 605 is filled with a porous fire-resistant expansion strip 606. The outer side of the porous fire-resistant expansion strip 606 has a circular installation groove 607 evenly spaced on the middle. The arc-shaped wide groove 603 and the arc-shaped narrow groove 604 are arranged alternately. The outer side of the heat-insulating installation strip 605 is tightly fitted to the inner wall of the arc-shaped narrow groove 604. The outer arc surface of the porous fire-resistant expansion strip 606 is flush with the outer arc surface of the outer protective sleeve 602. The outer side of the porous fire-resistant expansion strip 606 has fine holes that penetrate through it. An internal mounting box 608 is embedded inside the circular mounting groove 607. The internal mounting box 608 is filled with a sodium bicarbonate sheet 609. A central heat-conducting column 610 is snapped into the middle of the inner side of the internal mounting box 608. A positioning and clamping disc 611 is fixedly connected to one end of the central heat-conducting column 610. A heat-resistant elastic silicone capsule 612 is glued to the end of the internal mounting box 608 by adhesive. The heat-resistant elastic silicone capsule 612 is made of methyl vinyl silicone rubber. The sodium bicarbonate sheet 609 decomposes when heated to produce sodium carbonate, water vapor and carbon dioxide. The central heat-conducting column 610 and the positioning and clamping disc 611 are made of copper. Vent holes are evenly spaced along the circumference on the outer side of the positioning and clamping disc 611. A sealing and protective strip 613 is wrapped around the outer side of the outer protective sleeve 602 at the position corresponding to the outer side of the porous fireproof expansion strip 606. A heat dissipation silicone pad 614 is evenly embedded in the outer side of the sealing and protective strip 613 along the axial direction. The outer arc surface of the heat dissipation silicone pad 614 is flush with the outer arc surface of the sealing and protective strip 613. Heat dissipation stripes are evenly arranged on the outer side of the heat dissipation silicone pad 614. An isolation buffer strip 615 is embedded inside the arc groove wide groove 603. A central reinforcing rib 616 is embedded in the middle of the inner side of the isolation buffer strip 615. Buffer strip airbags 617 are embedded on both sides inside the isolation buffer strip 615. The outer side of the isolation buffer strip 615 is tightly fitted with the inner wall of the arc groove wide groove 603. The buffer strip airbags 617 are filled with inert gas and their volume shrinks when compressed. The outer protective sleeve 602 is covered with a protective side strip 618 at the position corresponding to the outer side of the isolation buffer rubber strip 615. The outer arc surfaces of the sealing protective insert 613 and the protective side strip 618 are flush with each other. The sealing protective insert 613 and the protective side strip 618 are connected by adhesive. The sealing protective insert 613 and the protective side strip 618 are made of the same rubber material. Through the cooperation between the internal components of the external dynamic impact fireproof mechanism 6, the flame-retardant and fireproof performance of the flame-retardant cable is optimized. The gas generated by the sodium bicarbonate sheet 609, combined with the bursting impact generated by the heat-resistant elastic silicone capsule 612, can quickly block the spread of flames along the outside of the cable, thereby effectively improving the fireproof performance of the flame-retardant cable. At the same time, when the flame-retardant cable is in the flame for a long time, the loose porous structure generated by the porous fireproof expansion rubber strip 606 can guide and constrain the carbon dioxide and water vapor generated by the sodium bicarbonate sheet 609 to form a flame-retardant and fireproof isolation zone on the outside of the flame-retardant cable, further improving the fireproof performance of the flame-retardant cable. Meanwhile, the components are assembled onto the outside of the flame-retardant cable through the arc-shaped wide groove 603 and the arc-shaped narrow groove 604, and the flame-retardant cable is directionally insulated by the heat-insulating installation strip 605, thereby ensuring that the flame-retardant cable can maintain stable operating performance during continuous use. At the same time, the combined structural design of the components inside the arc-shaped wide groove 603 and the arc-shaped narrow groove 604 makes it easier to replace components during subsequent maintenance and repair of the cable, further improving the safety and convenience of use of the flame-retardant cable. The shrinkage and deformation of the buffer strip airbag 617 inside the isolation buffer strip 615 buffers and dissipates the impact in the circumferential direction, and the overall structural strength of the isolation buffer strip 615 is strengthened by the central reinforcing rib 616, further ensuring the normal operation of impact fire extinguishing. The silicone protective layer 3 has an internally connected buffer protection mechanism 7 inside; The internally connected buffer protection mechanism 7 includes a central mounting cable 701, a triangular buffer strip 702, a buffer fan-shaped bladder 703, an isolation silicone plate 704, an isolation liquid guiding soft bladder 705, a liquid guiding inner channel 706, a central support cotton block 707, and an end buffer air bladder 708. A central mounting cable 701 is provided in the middle of the inner side of the silicone protective layer 3. Triangular buffer strips 702 are equidistantly installed on the outer side of the central mounting cable 701. Buffer fan-shaped bladders 703 are bonded to the outer side of the triangular buffer strips 702 at positions corresponding to the outer side of the inner insulation layer 2. The outer side of the buffer fan-shaped bladders 703 and the outer side of the inner insulation layer 2 are tightly slidably attached. The buffer fan-shaped bladders 703 are filled with insulating heat-conducting oil. An isolation silicone plate 704 is equidistantly sleeved at the ends of the triangular buffer strip 702 and the buffer fan-shaped bladder 703 on the outer side of the central mounting cable 701. Both ends of the triangular buffer strip 702 are fixedly connected to an isolation liquid-conducting soft bag 705. A liquid-conducting inner channel 706 is provided through the end face of the isolation liquid-conducting soft bag 705. A central support cotton block 707 is filled in the middle of the inner side of the triangular buffer strip 702. End buffer airbags 708 are bonded to both ends of the inner cavity of the triangular buffer strip 702. The isolation liquid-conducting soft bag 705 and the inner cavity of the triangular buffer strip 702 are interconnected by a connecting pipe. Both the isolation liquid-conducting soft bag 705 and the triangular buffer strip 702 are filled with insulating heat-conducting oil. Through the mutual cooperation of the components within the internally connected buffer protection mechanism 7, The overall structural strength of the flame-retardant cable is effectively improved. Through the double-connected telescopic structure inside the triangular buffer strip 702 and the buffer fan-shaped bladder 703, when the cable is subjected to external impact and compression, the impact is transferred and consumed by the axial flow of insulating heat-conducting oil inside the buffer fan-shaped bladder 703 and the flow between the insulating heat-conducting oil between the triangular buffer strip 702 and the isolation liquid-conducting soft bladder 705. The transfer of insulating heat-conducting oil also provides auxiliary support for the central conductor 1, thereby further improving the fixation stability of the flame-retardant cable during use and enhancing the overall structural strength of the flame-retardant cable. Meanwhile, the insulating heat-conducting oil inside the triangular buffer strip 702 and the buffer fan-shaped bladder 703 can assist in heat dissipation inside the flame-retardant cable, ensuring that the flame-retardant cable can maintain good heat dissipation performance during long-term use. The expansion and contraction characteristics of the end buffer airbag 708 are used to buffer the slight compression of the flame-retardant cable, improving the flame-retardant cable's resistance to periodic weak compression impacts, reducing the degree of fatigue wear of the internal components of the flame-retardant cable, and indirectly improving the service life of the flame-retardant cable.

[0021] The working principle and usage process of this invention: In the actual application of this invention, when flame-retardant cables are required, the center conductor 1 needs to be connected to a suitable position first, then the outer side of the center conductor 1 is protected by the inner insulation layer 2, and the multi-strand center conductor 1 is constrained by the silicone protective layer 3, the outer side of the silicone protective layer 3 is shielded by the inner shielding layer 4, and the outer side of the inner shielding layer 4 is insulated by the rubber protective outer layer 5. When flame retardant fireproofing is required on the outside of the flame retardant cable, the outer side of the rubber protective outer layer 5 is waterproofed by the outer waterproof isolation sleeve 601, and then the outer side of the outer waterproof isolation sleeve 601 is protected by the outer protective sleeve 602. The components are installed on the outside of the flame retardant cable through the outer protective sleeve 602. The isolation buffer rubber strip 615 and its internal components are installed on the outside of the flame retardant cable through the arc-shaped wide groove 603. The heat insulation installation soft strip 605 and its internal components are installed on the outside of the flame retardant cable through the arc-shaped narrow groove 604. During normal use of the flame-retardant cable, the heat dissipation silicone sheet 614 on the outside of the sealing protective strip 613 assists the flame-retardant cable in heat dissipation, ensuring that the cable can maintain good heat dissipation performance during use. The buffer strip airbag 617 inside the isolation buffer strip 615 provides elastic buffering for the outside of the flame-retardant cable, so that the cable can be buffered by the elastic deformation of the buffer strip airbag 617 after being subjected to external pressure, thereby improving the overall protective performance of the flame-retardant cable. When the flame-retardant cable is exposed to external flames, the sealing protective strip 613 and protective side strip 618 provide initial protection to the outside of the cable to prevent the flames from directly penetrating the cable's interior. As the sealing protective strip 613 and protective side strip 618 are damaged by the flames, the internal temperature of the cable gradually rises. With the continuous rise in the internal temperature of the mounting box 608, the heat from the external flames is rapidly conducted to the outside of the sodium bicarbonate pressure plate 609 through the central heat-conducting column 610 and the positioning clamping disc 611. Upon heating, the sodium bicarbonate pressure plate 609 gradually decomposes, producing sodium carbonate, carbon dioxide gas, and water vapor. The pressure generated by the release of carbon dioxide gas and water vapor causes the heat-resistant elastic silicon capsule 612 to expand outward continuously. At the same time, the heat-resistant elastic silicon capsule 612 is also subjected to the burning of flames during the expansion process, which leads to a decrease in structural strength. When the pressure generated by carbon dioxide gas and water vapor exceeds the expansion limit of the heat-resistant elastic silicon capsule 612, the heat-resistant elastic silicon capsule 612 will explode and generate a local shock wave. Under the influence of the shock wave, the flame on the outside of the flame-retardant cable will be extinguished temporarily. Meanwhile, the sodium bicarbonate sheet 609 will continue to release carbon dioxide and water vapor under the influence of high temperature to actively prevent the combustion phenomenon on the outside of the flame-retardant cable. While the heat-resistant elastic silicone capsule 612 explodes, it will generate a circumferential impact on the external structure of the flame-retardant cable. The impact in the circumferential direction is buffered and unloaded by the contraction and deformation of the buffer strip 617 inside the isolation buffer strip 615. The overall structural strength of the isolation buffer strip 615 is strengthened by the central reinforcing rib 616, which further ensures the normal operation of the impact fire extinguishing. Meanwhile, the porous fire-resistant expansion strip 606 will continue to expand during the burning process of the flame, and the holes on the outside of the porous fire-resistant expansion strip 606 will also expand synchronously, thus creating a loose and porous structure. After the porous fire-resistant expansion strip 606 expands, it will cover the end space of the installation box 608, so that after the heat-resistant elastic silicone capsule 612 ruptures, the carbon dioxide and water vapor generated by the sodium bicarbonate press 609 will actively diffuse into the gaps on the side of the porous structure created by the porous fire-resistant expansion strip 606, thereby allowing carbon dioxide and water vapor to stay on the outside of the flame-retardant cable for a long time, thereby further improving the fire resistance of the flame-retardant cable. Furthermore, the heat-insulating installation strip 605 provides directional heat insulation to the porous fire-resistant expansion strip 606 and the installation box 608 during the normal use of the flame-retardant cable, so as to prevent the heat generated during the cable production and use from being continuously transferred to the inside of the installation box 608 and causing the sodium bicarbonate sheet 609 to decompose, thus ensuring the stability of the internal components of the installation box 608 during normal use. When the cable needs internal protection during normal use, the triangular buffer strip 702 and its components are installed inside the silicone protective layer 3 through the central mounting cable 701, and the ends of two adjacent buffer sector bags 703 are isolated and connected through the isolation silicone plate 704, thereby effectively improving the connection strength between the buffer sector bags 703. When the external compression of the cable is transmitted to the inside of the silicone protective layer 3, when the buffer sector 703 is subjected to sudden external compression, the pressure inside the buffer sector 703 will rise rapidly. At the same time, the central support cotton block 707 provides auxiliary support to the inside of the buffer sector 703, thereby causing the volume of the end buffer air 708 inside the buffer sector 703 to shrink, and causing the insulating heat-conducting oil in the middle of the buffer sector 703 to flow along the inner liquid channel 706 to both ends of the inner liquid channel 706, so as to buffer the external impact through the flow of the insulating heat-conducting oil inside the buffer sector 703. Furthermore, the excessively fast flow rate of the insulating heat-conducting oil will squeeze the inner channel 706, causing the diameter of the inner channel 706 to expand temporarily. During the expansion of the inner channel 706, the insulating heat-conducting soft bag 705 will be squeezed, allowing the insulating heat-conducting oil inside the insulating heat-conducting soft bag 705 to be introduced into the buffer sector bag 703. This causes the buffer sector bag 703 to expand outward, thereby supporting the center conductor 1 outward through the expansion of the buffer sector bag 703. This prevents the center conductor 1 from shifting under external impact, further improving the stability of the internal structure of the flame-retardant cable.

[0022] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An environmentally friendly, waterproof, low-smoke, halogen-free flame-retardant cable, comprising a center conductor (1), characterized in that: The center conductor (1) is covered with an inner insulation layer (2) on the outside, and the inner insulation layer (2) is covered with a silicone protective layer (3) on the outside. The silicone protective layer (3) is covered with an inner shielding layer (4) and a rubber protective outer layer (5) in sequence. An external dynamic impact fireproof mechanism (6) is provided on the outside of the rubber protective outer layer (5). The external dynamic impact fireproof mechanism (6) is used to protect the outside of the cable to prevent the flame from spreading along the cable. The external dynamic impact fireproof mechanism (6) includes an external waterproof isolation sleeve (601); The outer rubber protective layer (5) is covered with an outer waterproof isolation sleeve (601), and the outer waterproof isolation sleeve (601) is covered with an outer protective sleeve (602). The outer protective sleeve (602) is provided with an arc-shaped wide groove (603) and an arc-shaped narrow groove (604) on its outer side. The arc-shaped narrow groove (604) is filled with a heat-insulating installation strip (605), and the heat-insulating installation strip (605) is filled with a porous fire-resistant expansion strip (606). A circular installation groove (607) is opened on the outside of the porous fire-resistant expansion strip (606). The circular mounting groove (607) is inlaid with an internal mounting box (608), the internal mounting box (608) is filled with sodium bicarbonate tablets (609), a central heat-conducting column (610) is snapped into the middle of the inner side of the internal mounting box (608), a positioning and clamping disc (611) is fixedly connected to one end of the central heat-conducting column (610), and a heat-resistant elastic silicone capsule (612) is bonded to the end of the internal mounting box (608).

2. The environmentally friendly, waterproof, low-smoke, halogen-free flame-retardant cable according to claim 1, characterized in that, The wide arc groove (603) and the narrow arc groove (604) are arranged alternately. The outer side of the heat insulation installation strip (605) is closely attached to the inner wall of the narrow arc groove (604). The outer arc surface of the porous fireproof expansion strip (606) is flush with the outer arc surface of the outer protective sleeve (602). The outer side of the porous fireproof expansion strip (606) has fine holes.

3. The environmentally friendly, waterproof, low-smoke, halogen-free flame-retardant cable according to claim 1, characterized in that, The sodium bicarbonate tablet (609) decomposes upon heating to produce sodium carbonate, water vapor and carbon dioxide. The central heat-conducting column (610) and the positioning and pressing disc (611) are made of copper, and the positioning and pressing disc (611) has vent holes evenly spaced along the circumferential direction on its outer side.

4. The environmentally friendly, waterproof, low-smoke, halogen-free flame-retardant cable according to claim 1, characterized in that, The outer protective sleeve (602) is covered with a sealing protective strip (613) at the position corresponding to the outer side of the porous fireproof expansion strip (606). A heat dissipation silicone pad (614) is uniformly embedded in the outer side of the sealing protective strip (613) along the axial direction. An isolation buffer strip (615) is embedded inside the arc groove (603), a central reinforcing rib (616) is embedded in the middle of the inner side of the isolation buffer strip (615), and buffer strip airbags (617) are embedded on both sides inside the isolation buffer strip (615). The outer protective sleeve (602) is covered with a protective side strip (618) at the position corresponding to the outer side of the isolation buffer strip (615).

5. The environmentally friendly, waterproof, low-smoke, halogen-free flame-retardant cable according to claim 4, characterized in that, The outer arc surface of the heat dissipation silicone pad (614) is flush with the outer arc surface of the sealing and protective strip (613), and heat dissipation stripes are evenly and equidistantly arranged on the outer side of the heat dissipation silicone pad (614).

6. The environmentally friendly, waterproof, low-smoke, halogen-free flame-retardant cable according to claim 4, characterized in that, The outer side of the isolation buffer strip (615) is tightly fitted to the inner wall of the arc groove (603), the buffer strip airbag (617) is filled with inert gas, and the buffer strip airbag (617) shrinks in volume after being squeezed.

7. The environmentally friendly, waterproof, low-smoke, halogen-free flame-retardant cable according to claim 4, characterized in that, The outer arc surfaces of the sealing and protective strip (613) and the protective side strip (618) are flush with each other. The sealing and protective strip (613) and the protective side strip (618) are connected by adhesive. The sealing and protective strip (613) and the protective side strip (618) are made of the same rubber material.

8. The environmentally friendly, waterproof, low-smoke, halogen-free flame-retardant cable according to claim 4, characterized in that, The silicone protective layer (3) is provided with an internally connected buffer protection mechanism (7), which is used to buffer the impact on the outside of the flame-retardant cable to ensure the structural stability of the inside of the flame-retardant cable. The internally connected buffer protection mechanism (7) includes a central mounting cable (701). A central mounting cable (701) is provided in the middle of the inner side of the silicone protective layer (3). Triangular buffer strips (702) are equidistantly installed on the outer side of the central mounting cable (701). Buffer fan-shaped bags (703) are bonded to the outer side of the triangular buffer strips (702) at positions corresponding to the outer side of the inner insulating layer (2). The central mounting cable (701) is fitted with insulating silicone plates (704) at equal intervals at the ends of the triangular buffer strip (702) and the buffer fan-shaped bladder (703). Both ends of the triangular buffer strip (702) are fixedly connected to an isolation fluid guiding soft bag (705). The end face of the isolation fluid guiding soft bag (705) is provided with a fluid guiding inner channel (706). The middle of the inner side of the triangular buffer strip (702) is filled with a central support cotton block (707). Both ends of the inner cavity of the triangular buffer strip (702) are bonded with end buffer airbags (708).

9. The environmentally friendly, waterproof, low-smoke, halogen-free flame-retardant cable according to claim 8, characterized in that, The outer side of the buffer fan-shaped bag (703) and the outer side of the inner insulating layer (2) are closely slidably attached, and the buffer fan-shaped bag (703) is filled with insulating heat-conducting oil.

10. The environmentally friendly, waterproof, low-smoke, halogen-free flame-retardant cable according to claim 8, characterized in that, The insulating fluid-conducting soft bag (705) and the triangular buffer strip (702) are connected to each other through a connecting pipe, and the insulating fluid-conducting soft bag (705) and the triangular buffer strip (702) are filled with insulating heat-conducting oil.

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