Marine fire-retardant low-smoke halogen-free cable

Abstract

The utility model discloses a marine fire -retardant low smoke halogen -free cable relates to marine electrical equipment technical field. The marine fire -retardant low smoke halogen -free cable, including the conductor, the conductor is formed through the concentric type stranding, and the outside fixedly connected with the conductor protective layer of conductor, the outside fixedly connected with the insulation reinforcing layer of conductor protective layer, and the outer layer fixedly connected with the insulating layer of insulation reinforcing layer, the outside of insulating layer is provided with fire -resistant layer, buffer shielding layer and protective layer respectively. The marine fire -retardant low smoke halogen -free cable, and the conductor adopts the concentric type stranding, can make the current uniform distribution, reduces the skin effect loss, and promotes the conduction efficiency. The conductor protective layer wraps the conductor, can insulate water vapor impurity, avoids its oxidation, and protects integrity with the outer layer friction, and the insulation reinforcing layer is with high -strength material and enhances structural toughness, prevents the insulation layer from cracking due to external force, and the insulating layer blocks the current leakage with excellent insulation, guarantees the power transmission safety, and four -layer structure cooperates and guarantees the stable cable core conduction function.

Description

Technical Field

[0001] This utility model relates to the field of marine electrical equipment technology, and in particular to marine fireproof low-smoke halogen-free cables. Background Technology

[0002] As a special type of mobile platform on water, the safety of a ship's electrical system is directly related to navigation safety and the protection of personnel's lives. The enclosed cabin space and dense equipment layout dramatically amplify the risk of fire, and the fire resistance of cables, as the core carrier of power and signal transmission, is particularly critical. Traditional polyvinyl chloride (PVC) cables release large amounts of hydrogen chloride gas when burning, with a toxicity index of over 15. At the same time, the dense smoke produced often has a light transmittance of less than 15%, which not only hinders fire rescue in enclosed environments but also easily causes personnel to suffocate. Statistics from the International Maritime Organization (IMO) show that 80% of casualties in ship fires are caused by toxic smoke rather than direct flame damage, and the existing fire-resistant design of cables is no longer able to meet the latest IMO safety standards.

[0003] The complexity of the marine environment poses severe challenges to the weather resistance of cables. High concentrations of salt spray, humidity levels exceeding 95%, and continuous oil erosion can accelerate the corrosion of metal components and cause aging and cracking of insulation materials in traditional cables. Tests conducted by a classification society show that after 1000 hours of salt spray testing, the insulation resistance of ordinary low-smoke halogen-free cables decreased by more than 30%, and the corrosion rate of the metal armor layer reached 0.1 mm / year. At the same time, the ±30° swaying and continuous vibration during ship navigation can easily cause interlayer peeling in cables. The mechanical bonding structure between the fire-resistant layer and the insulation layer showed a peeling rate as high as 35% after 1000 hours of vibration testing, directly leading to a 40% reduction in fire resistance and seriously threatening the long-term reliability of the electrical system. Utility Model Content

[0004] The purpose of this utility model is to at least solve one of the technical problems existing in the prior art, and to provide a solution that can solve the above-mentioned problems.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a marine fireproof low-smoke halogen-free cable, comprising a conductor, wherein the conductor is formed by concentric stranding, a conductor protective layer is fixedly connected to the outside of the conductor, an insulation reinforcement layer is fixedly connected to the outside of the conductor protective layer, and an insulation layer is fixedly connected to the outer layer of the insulation reinforcement layer. The outer side of the insulation layer is provided with a fire-resistant layer, a buffer shielding layer and a protective layer.

[0006] Preferably, the refractory layer includes an inner refractory layer, the inner wall of which is fixedly connected to a first adhesive layer, and the inner side of the first adhesive layer is fixedly connected to the outer side of the insulating layer.

[0007] Preferably, an outer refractory layer is provided on the outside of the inner refractory layer, and a ceramicized fireproof coating is provided between the outer refractory layer and the inner refractory layer. The outer side of the ceramicized fireproof coating is fixedly connected to the inner side of the outer layer of the fire-resistant layer, and the inner side of the ceramicized fireproof coating is fixedly connected to the outer side of the inner layer of the fire-resistant layer.

[0008] Preferably, the buffer shielding layer includes a buffer layer, an inner padding layer is fixedly connected inside the buffer layer, and a second adhesive layer is fixedly connected to the inner side of the inner padding layer; The inner side of the second adhesive layer is fixedly connected to the outer side of the outer layer of the refractory layer.

[0009] Preferably, a shielding layer is fixedly connected to the outside of the buffer layer.

[0010] Preferably, the protective layer includes an armor layer, the inner side of which is fixedly connected to the outer side of the shielding layer, and a sheath connecting layer is fixedly connected to the outer side of the armor layer.

[0011] Preferably, an outer sheath is fixedly connected to the outer side of the sheath connecting layer.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This marine fire-resistant, low-smoke, halogen-free cable features a first bonding layer that firmly bonds the insulation layer to the inner fire-resistant layer, preventing separation during fire or vibration and ensuring structural integrity. The inner fire-resistant layer acts as the first line of fire protection, using high-temperature resistant materials to block initial heat transfer. The ceramicized fire-resistant coating rapidly transforms into a hard ceramic layer at high temperatures, filling gaps between layers, enhancing insulation, and preventing direct friction damage between the two fire-resistant layers. The outer and inner fire-resistant layers are arranged in opposite directions, forming cross-protection and further delaying heat penetration. This multi-layered design significantly improves the cable's fire resistance limit.

[0013] This marine fire-resistant, low-smoke, halogen-free cable features a second bonding layer that tightly bonds the outer fire-resistant layer to the inner padding layer, preventing the buffer shielding layer from separating from the fire-resistant layer. The inner padding layer contains anti-corrosion components, which can block salt spray and moisture from the marine environment from penetrating the inner layer and protect the fire-resistant structure. The buffer layer uses elastic materials to absorb the impact force generated by ship vibration, reducing vibration damage to the internal structure and alleviating interlayer stress caused by temperature changes. The shielding layer uses highly conductive materials to reflect and absorb electromagnetic signals, preventing the cable's own signals from interfering with external equipment and ensuring the stability of communication and power transmission.

[0014] This shipboard fire-resistant, low-smoke, halogen-free cable features an armor layer woven from high-strength materials, forming a robust outer shell to resist damage from mechanical collisions, compression, and other external forces during ship operation, protecting the internal structure. The sheath connection layer ensures a tight bond between the armor layer and the outer sheath, preventing moisture and oil from seeping in through the gaps between the layers. The outer sheath is made of weather-resistant and corrosion-resistant materials, directly resisting external ultraviolet rays, salt spray, and oil erosion, while also possessing flame-retardant properties to slow the spread of fire. Its special structural design also enhances the bonding force with the inner layer, improving the overall durability of the protection. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the structure of the marine fireproof low-smoke halogen-free cable of this utility model; Figure 2 This utility model Figure 1 Enlarged view of point A; Figure 3 This utility model Figure 2 Enlarged view of point B; Figure 4 This is a schematic cross-sectional view of the fireproof, low-smoke, halogen-free cable for marine applications, as shown in this utility model. Figure 5 This utility model Figure 4 Enlarged diagram of point C.

[0016] Reference numerals: 1. Conductor; 2. Conductor protective layer; 3. Insulation reinforcement layer; 4. Insulation layer; 5. First adhesive layer; 6. Inner layer of fire-resistant layer; 7. Ceramicized fire-retardant coating; 8. Outer layer of fire-resistant layer; 9. Second adhesive layer; 10. Inner padding layer; 11. Buffer layer; 12. Shielding layer; 13. Armor layer; 14. Sheath connection layer; 15. Outer sheath. Detailed Implementation

[0017] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0018] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of terms like "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the quantity or sequence of the indicated technical features.

[0020] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0021] Please see Figure 1-5 This utility model provides a technical solution: marine fireproof low smoke halogen-free cable, including conductor 1, conductor 1 is formed by concentric stranding, conductor protective layer 2 is fixedly connected to the outside of conductor 1, insulation reinforcement layer 3 is fixedly connected to the outside of conductor protective layer 2, and insulation layer 4 is fixedly connected to the outer layer of insulation reinforcement layer 3. A fire-resistant layer, a buffer shielding layer, and a protective layer are respectively provided on the outer side of the insulation layer 4; The conductor 1 is concentrically stranded, which allows for uniform current distribution, reduces losses caused by the skin effect, and improves conductivity. The conductor protective layer 2 tightly wraps around the conductor 1, isolating it from moisture and impurities, preventing oxidation, and buffering friction between the conductor 1 and the outer structure to protect its integrity. The insulation reinforcement layer 3 uses high-strength materials to enhance the overall structural toughness and prevent the insulation layer 4 from cracking due to external stretching or bending. The insulation layer 4 utilizes its excellent insulation properties to block current leakage and ensure safe power transmission. The four-layer structure works together to ensure the stable performance of the cable's core conductive function. Furthermore, the refractory layer includes an inner refractory layer 6, the inner wall of which is fixedly connected to a first adhesive layer 5, and the inner side of the first adhesive layer 5 is fixedly connected to the outer side of the insulating layer 4. A fire-resistant outer layer 8 is provided on the outside of the inner fire-resistant layer 6, and a ceramicized fireproof coating 7 is provided between the outer fire-resistant layer 8 and the inner fire-resistant layer 6. The outer side of the ceramicized fireproof coating 7 is fixedly connected to the inner side of the outer layer 8 of the fire-resistant layer, and the inner side of the ceramicized fireproof coating 7 is fixedly connected to the outer side of the inner layer 6 of the fire-resistant layer. The first bonding layer 5 firmly bonds the insulation layer 4 to the inner fire-resistant layer 6, preventing the layers from separating during fire or vibration and ensuring the integrity of the structure. The inner fire-resistant layer 6 serves as the first fire barrier, using high-temperature resistant materials to block initial heat transfer. The ceramicized fire-resistant coating 7 rapidly transforms into a hard ceramic layer at high temperatures, filling the gaps between layers, enhancing the heat insulation effect, and preventing direct friction damage between the two fire-resistant layers. The outer fire-resistant layer 8 is set in opposite directions to the inner fire-resistant layer 6, forming cross protection, further delaying heat penetration. The multi-layered design significantly improves the fire resistance limit of the cable. Furthermore, the buffer shielding layer includes a buffer layer 11, an inner padding layer 10 is fixedly connected inside the buffer layer 11, and a second adhesive layer 9 is fixedly connected to the inner side of the inner padding layer 10. The inner side of the second adhesive layer 9 is fixedly connected to the outer side of the fire-resistant outer layer 8; A shielding layer 12 is fixedly connected to the outside of the buffer layer 11; The second bonding layer 9 tightly bonds the outer refractory layer 8 and the inner padding layer 10, preventing the buffer shielding layer from separating from the refractory layer. The inner padding layer 10 contains anti-corrosion components, which can block salt spray and moisture from the marine environment from penetrating the inner layer and protect the refractory structure. The buffer layer 11 is made of elastic material, which can absorb the impact force generated by ship vibration, reduce the vibration damage to the internal structure, and at the same time alleviate the interlayer stress caused by temperature changes. The shielding layer 12 reflects and absorbs electromagnetic signals through highly conductive materials, avoiding interference between the cable's own signals and external equipment, and ensuring the stability of communication and power transmission. Furthermore, the protective layer includes an armor layer 13, the inner side of which is fixedly connected to the outer side of the shielding layer 12, and a sheath connecting layer 14 is fixedly connected to the outer side of the armor layer 13. An outer sheath 15 is fixedly connected to the outer side of the sheath connecting layer 14; The armor layer 13 is woven from high-strength materials to form a sturdy outer shell, resisting damage from mechanical collisions, compression, and other external forces during ship operation and protecting the internal structure. The sheath connecting layer 14 tightly bonds the armor layer 13 to the outer sheath 15, preventing moisture and oil from seeping in through the gaps between the layers. The outer sheath 15 is made of weather-resistant and corrosion-resistant materials, directly resisting external ultraviolet rays, salt spray, and oil erosion. It also has flame-retardant properties, delaying the spread of fire. Its special structural design can also enhance the bonding force with the inner layer and improve the overall durability of the protection.

[0022] Working principle: The first bonding layer 5 firmly bonds the insulation layer 4 to the inner fire-resistant layer 6, preventing the layers from separating during fire or vibration and ensuring the integrity of the structure; the inner fire-resistant layer 6 acts as the first fire barrier, using high-temperature resistant materials to block initial heat transfer; the ceramicized fire-resistant coating 7 rapidly transforms into a hard ceramic layer at high temperatures, filling the gaps between layers, enhancing the heat insulation effect, and preventing direct friction damage between the two fire-resistant layers; the outer fire-resistant layer 8 is set in opposite directions to the inner fire-resistant layer 6, forming cross protection, further delaying heat penetration, and the multi-layer cooperation significantly improves the fire resistance limit of the cable.

[0023] The second bonding layer 9 tightly bonds the outer refractory layer 8 and the inner padding layer 10, preventing the buffer shielding layer from separating from the refractory layer. The inner padding layer 10 contains anti-corrosion components, which can block salt spray and moisture from the marine environment from penetrating the inner layer and protect the refractory structure. The buffer layer 11 is made of elastic material, which can absorb the impact force generated by ship vibration, reduce the vibration damage to the internal structure, and at the same time alleviate the interlayer stress caused by temperature changes. The shielding layer 12 reflects and absorbs electromagnetic signals through highly conductive materials, avoiding mutual interference between the cable's own signals and external equipment, and ensuring the stability of communication and power transmission.

[0024] The armor layer 13 is woven from high-strength materials to form a sturdy outer shell, resisting damage from mechanical collisions, compression, and other external forces during ship operation and protecting the internal structure. The sheath connecting layer 14 tightly bonds the armor layer 13 to the outer sheath 15, preventing moisture and oil from seeping in through the gaps between the layers. The outer sheath 15 is made of weather-resistant and corrosion-resistant materials, directly resisting external ultraviolet rays, salt spray, and oil erosion. It also has flame-retardant properties, delaying the spread of fire. Its special structural design can also enhance the bonding force with the inner layer and improve the overall durability of the protection.

[0025] Structural Description: Conductor 1: As the conductive core of the cable, it is composed of high-purity oxygen-free copper wire with a diameter of 0.1-0.3mm and a copper wire purity of not less than 99.99%. Such high purity can control the resistivity to ≤0.0172Ω・mm² / m, effectively improving the conductivity. It adopts a standard concentric stranding method, and the stranding pitch is strictly controlled at 10-15 times the outer diameter of the conductor, preferably 12 times. This stranding structure can significantly improve the flexibility of the conductor. It has been tested and can withstand ≥10,000 bends with a bending radius of 4 times the conductor diameter without breaking. It can also make the stress distribution of the conductor uniform in the ship vibration environment, avoid local fatigue fracture, and adapt to the vibration conditions of the ship. Conductor protective layer 2: It tightly wraps around the outside of conductor 1, and is made of low-smoke halogen-free polyolefin material with a thickness of 0.1-0.2mm. This protective layer is soft and has a certain degree of insulation. It can not only prevent conductor 1 from being damaged by direct friction with the outer insulation reinforcement layer 3, but also play a preliminary insulating role, blocking the electrical connection between the conductor and the outside world. At the same time, it can effectively block moisture intrusion, prevent the conductor from being damp and oxidized, and has good compatibility with both conductor 1 and insulation reinforcement layer 3, ensuring the stability of the overall structure. Insulation reinforcement layer 3: Located on the outside of conductor protection layer 2, it is made of fiberglass cloth with a thickness between 0.05-0.1mm. Fiberglass cloth has high strength and excellent high temperature resistance, which can significantly enhance the overall mechanical strength of the cable. Especially when the cable is stretched or bent, it can effectively improve the tensile and tear resistance of the outer insulation layer 4. Tests have shown that it can increase the tensile strength of the insulation layer by 20%. At the same time, it also has good insulation properties and can work synergistically with insulation layer 4 to further improve the overall insulation effect of the cable. Insulation layer 4: Made of halogen-free flame-retardant cross-linked polyethylene material of model WDZA-YJY, it forms a stable three-dimensional network molecular structure after being treated with an irradiation cross-linking process. This structure makes the material's performance more stable. The thickness is 0.5-1.2mm and can be adjusted according to the conductor cross-section. It has a wide operating temperature range and can work stably for a long time in an environment from -40℃ to 125℃. The short-term temperature resistance can even reach 150℃. The insulation resistance is ≥10¹. 4 When the dielectric loss tangent is ≤0.001520℃, the electrical performance is stable and the oxygen index is ≥32%, which meets the Class A flame retardant requirements in GB / T19666-2005. It has excellent insulation performance and flame retardant effect. The first adhesive layer 5 is composed of silane-modified polyolefin halogen-free adhesive, with a thickness of 0.01-0.03 mm and an adhesive strength of not less than 2 MPa. It can firmly bond the insulation layer 4 to the inner fire-resistant layer 6 to form an integral structure. Even in the event of a fire or severe ship vibration, it can effectively prevent delamination between layers, thereby ensuring the integrity of the cable structure and ensuring that fire resistance and other performance characteristics are not affected. At the same time, the adhesive has halogen-free flame-retardant properties, which are compatible with the overall material properties of the cable. The inner fire-resistant layer 6 is composed of phlogopite tape with a single tape thickness of 0.05-0.1mm and an overlap rate of 30%-50%, preferably 40%. Phlogopite tape has extremely outstanding high-temperature resistance, with a temperature resistance of over 1000℃. As the inner layer of the fire-resistant structure, it can effectively block the heat transfer to the interior in the early stage of a fire, laying a solid foundation for the fire resistance performance of the cable and delaying the damage of high temperature to the internal structure. Ceramicized fireproof coating 7: Located between the inner fire-resistant layer 6 and the outer fire-resistant layer 8, it is made of ceramicized silicone rubber material with a thickness of 0.02-0.05mm. This material will rapidly undergo a ceramicization reaction under high temperature environment to form a hard and dense ceramic layer. This ceramic layer can not only further block heat transfer, but also extend the fire resistance time of the cable by more than 30% according to tests. It can also enhance the integrity between the two mica tapes, reduce interlayer slippage, and still have good insulation performance after ceramicization, which can prevent short circuits between layers in the event of a fire. Outer layer 8 of the fire-resistant layer: also made of phlogopite tape, with a single tape thickness of 0.05-0.1mm and a wrapping overlap rate of 30%-50%, preferably 40%, and with the wrapping direction opposite to that of the inner layer 6 of the fire-resistant layer; this double-layer reverse wrapping design can make the two layers of mica tape restrain each other, forming a more stable whole, which greatly improves the overall strength and stability of the fire-resistant layer. When the cable is subjected to vibration and bending, it can effectively reduce the risk of cracking and further enhance the fire resistance reliability of the cable; The second bonding layer 9 is made of the same material as the first bonding layer 5, namely silane-modified polyolefin halogen-free adhesive, with a thickness of 0.01-0.03 mm and a bonding strength of not less than 2 MPa. Its main function is to tightly bond the outer layer 8 of the fire-resistant layer to the inner padding layer 10, so that the fire-resistant structure and the subsequent protective structure form a coherent whole, further strengthening the integrity of the cable structure and preventing interlayer separation in the harsh operating environment of the ship. Inner layer 10: Based on low-smoke halogen-free polyolefin material, nano-sized perfluoropolyether compounds are added as corrosion inhibitors, with an addition amount of 1%-3% of the total mass of the inner layer material and a thickness of 0.3-0.8mm. The perfluoropolyether nanoparticles have a particle size between 50-100nm and can form a dense protective film on the material surface, resulting in a water contact angle ≥110° and excellent hydrophobicity. After 1000 hours of ASTM B117 salt spray testing, the corrosion area is <3%, which is far superior to the corrosion area of ​​traditional materials >25%. At the same time, the material's oxygen index is ≥30%, which matches the overall flame retardant performance of the cable and can effectively improve the cable's salt spray resistance and corrosion resistance. Buffer layer 11: Made of low-smoke halogen-free elastomer material, with a thickness of 0.2-0.4mm and a Shore A hardness between 60-70; This buffer layer has good elasticity and toughness, which can effectively absorb the vibration energy generated during ship navigation, reduce the impact of the outer armor layer 13 on the internal structure, and at the same time, when the ambient temperature changes from -40℃ to 80℃, it can alleviate the thermal stress caused by thermal expansion and contraction between the structural layers, avoid material cracking, and has good compatibility with adjacent layer materials, with no migration phenomenon, ensuring the long-term stable operation of the cable; Shielding layer 12: A copper-plastic composite tape wrapping structure, wherein the copper layer thickness is not less than 0.05mm, and the plastic layer is made of low-smoke halogen-free polyethylene material with a total thickness of 0.1-0.2mm. The copper layer has high conductivity, effectively reflecting and absorbing electromagnetic interference (EMI), with a shielding effectiveness ≥85dB 100kHz-1GHz. The plastic layer ensures the flexibility of the structure, avoiding the defects of easy breakage of pure metal tapes. The outer surface is provided with raised portions at intervals, with a height of 0.05-0.1mm and an adjacent spacing of 5-10mm. These raised portions increase the gap between the shielding layer and the armor layer, reducing the contact area between them, thereby reducing frictional damage during vibration. They also facilitate heat dissipation, improving the cable's heat dissipation efficiency by 15% according to tests, and the wrapping overlap rate is ≥15%, ensuring the continuity of shielding and effectively reducing signal transmission error to ≤0.5%. Armor layer 13: Woven from galvanized steel wire with a diameter of 0.3-0.5mm, tensile strength of 345-490MPa, and passivated, with a weaving density of not less than 80%, preferably 85%. The high weaving density forms a robust mechanical protective net with an impact resistance of 10kJ / m², capable of withstanding accidental collisions during ship equipment operation and protecting the internal structure from damage. The galvanized layer combined with passivation treatment significantly improves its corrosion resistance, with a corrosion rate ≤0.01mm / year in salt spray tests. At the same time, the steel wire braided structure retains a certain degree of flexibility, allowing the cable's bending radius to be controlled within 6 times the cable's outer diameter, facilitating installation and layout. Sheath connection layer 14: made of halogen-free hot melt adhesive, with a thickness of 0.05-0.1mm; during the cable production process, the hot melt adhesive is melted by heating and then tightly bonded to the armor layer 13 and the outer sheath 15, which can firmly bond the two and prevent the outer sheath from falling off during use. At the same time, the hot melt adhesive has good sealing properties after curing, which can effectively prevent water and oil from seeping into the internal structure from the gaps between the layers, and has a certain degree of elasticity, which can relieve the stress generated between the outer sheath and the armor layer due to force. Outer Sheath 15: Made of low-smoke halogen-free flame-retardant polyolefin material with benzotriazole UV absorbers added at 0.2%-0.5% of the total mass of the outer sheath material, with a thickness of 1.0-2.0mm; this material has passed the flame retardancy test of GB / T18380.3-2001, with a self-extinguishing time ≤10 seconds during vertical burning, demonstrating excellent flame retardant performance; the UV absorber can effectively absorb 280-340nm ultraviolet rays, and after 1000 hours of xenon lamp aging test, the material's tensile strength retention rate is ≥85%. The material retains ≤60% of its weight, far exceeding the retention rate of the unadded material. The inner surface has a spiral groove with a width of 0.5-1mm and a depth of 0.3-0.6mm. This design increases the contact area between the outer sheath and the sheath connection layer, improves the bonding strength, and provides room for expansion and contraction when the cable is bent, reducing the risk of cracking. The material also has excellent oil resistance. In the ASTM D471 standard oil immersion test, the volume change rate is ≤5% after 100℃×168 hours, and the hardness change is ≤5 Shore A.

[0026] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. Marine fireproof low-smoke halogen-free cable, comprising a conductor (1), characterized in that: The conductor (1) is formed by concentric twisting. A conductor protective layer (2) is fixedly connected to the outside of the conductor (1). An insulation reinforcement layer (3) is fixedly connected to the outside of the conductor protective layer (2). An insulation layer (4) is fixedly connected to the outer layer of the insulation reinforcement layer (3). The outer side of the insulation layer (4) is provided with a fire-resistant layer, a buffer shielding layer and a protective layer.

2. The marine fire-resistant, low-smoke, halogen-free cable according to claim 1, characterized in that: The fire-resistant layer includes a fire-resistant inner layer (6), and a first adhesive layer (5) is fixedly connected to the inner wall of the fire-resistant inner layer (6). The inner side of the first adhesive layer (5) is fixedly connected to the outer side of the insulating layer (4).

3. The marine fire-resistant, low-smoke, halogen-free cable according to claim 2, characterized in that: The outer side of the inner refractory layer (6) is provided with an outer refractory layer (8), and a ceramic fireproof coating (7) is provided between the outer refractory layer (8) and the inner refractory layer (6). The outer side of the ceramicized fireproof coating (7) is fixedly connected to the inner side of the outer layer of the fire-resistant layer (8), and the inner side of the ceramicized fireproof coating (7) is fixedly connected to the outer side of the inner layer of the fire-resistant layer (6).

4. The marine fire-resistant, low-smoke, halogen-free cable according to claim 3, characterized in that: The buffer shielding layer includes a buffer layer (11), an inner padding layer (10) is fixedly connected inside the buffer layer (11), and a second adhesive layer (9) is fixedly connected to the inner side of the inner padding layer (10). The inner side of the second adhesive layer (9) is fixedly connected to the outer side of the fire-resistant outer layer (8).

5. The marine fire-resistant, low-smoke, halogen-free cable according to claim 4, characterized in that: A shielding layer (12) is fixedly connected to the outside of the buffer layer (11).

6. The marine fire-resistant, low-smoke, halogen-free cable according to claim 5, characterized in that: The protective layer includes an armor layer (13), the inner side of which is fixedly connected to the outer side of the shielding layer (12), and a sheath connecting layer (14) is fixedly connected to the outer side of the armor layer (13).

7. The marine fire-resistant, low-smoke, halogen-free cable according to claim 6, characterized in that: An outer sheath (15) is fixedly connected to the outer side of the sheath connecting layer (14).

Images