Halogen-free low-smoke flame-retardant fire-resistant cable

Abstract

The utility model discloses a kind of halogen-free low smoke flame-retardant fire-resistant cables, it relates to cable technical field, including cable core, the cable core includes wire core and filling layer, the outside of cable core is wrapped and is provided with halogen-free glass silk tape layer, and halogen-free glass silk tape layer is overlapped and wrapped along the trend of cable core with forty-five degree angle of inclination, the outside of halogen-free glass silk tape layer is provided with inner liner, and inner liner is formed by extrusion coating between halogen-free glass silk tape layer, the outside of inner liner is wrapped with fire resistance layer, the outside of fire resistance layer is provided with composite flame-retardant layer, and composite flame-retardant layer is formed by extrusion coating between fire resistance layer, the outside of composite flame-retardant layer is extruded and wrapped with outer sheath, the insulating layer, outer sheath etc. of this cable use halogen-free material, composite flame-retardant layer uses magnesium hydroxide and halogen-free polyolefin composite system, absorb a large amount of heat when thermal decomposition, release water vapor dilution combustible gas simultaneously, realize the comprehensive performance of halogen-free, low smoke, flame-retardant and fire-resistant.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, specifically to a halogen-free, low-smoke, flame-retardant, and fire-resistant cable. Background Technology

[0002] Cables are wire products used to transmit electrical energy, signals, or convert electromagnetic energy. They are typically composed of one or more insulated conductors wrapped with an outer protective layer. As key devices for transmitting electrical energy or signals, cables are widely used in construction, rail transportation, chemical industries, and other fields. In emergencies such as fires, ordinary cables are easily flammable and release large amounts of toxic gases and dense smoke, which not only hinders personnel evacuation and rescue efforts but also exacerbates equipment damage.

[0003] Chinese Patent Publication No. CN208903704U, authorized on May 24, 2019, discloses a halogen-free, low-smoke, flame-retardant, and fire-resistant cable. The cable includes a cable core and an outer layer surrounding the cable core. The cable core comprises, from the inside out, a conductor, an insulation layer, a metal wire shielding layer, a flame-retardant and oxygen-barrier liner, and an armor layer. The outer layer comprises, from the inside out, a water-blocking wrapping layer, a steel wire braiding layer, a flame-retardant wrapping tape layer, a rubber sheath, and an outer sheath. The armor layer effectively protects the conductor, the fiber filling increases the cable's tensile strength, the steel wire braiding layer improves the cable's strength, and the grooved design of the rubber sheath improves the cable's bending strength. Combined with the electromagnetic shielding performance of the metal wire shielding layer, the flame-retardant effect of the flame-retardant and oxygen-barrier liner and the flame-retardant wrapping tape layer, and the anti-aging properties of the outer sheath, the cable of this invention possesses excellent mechanical properties, high-temperature resistance, and low-smoke, halogen-free, and flame-retardant performance.

[0004] Existing cables do not use halogen-free materials. Although they can delay combustion, they still produce toxic gases when burning. Furthermore, they lack specialized fire-resistant structures, making it difficult to simultaneously meet the comprehensive requirements of halogen-free, low-smoke, and fire-resistant properties. This results in significant deficiencies in high-safety-standard scenarios and fails to meet usage requirements. Utility Model Content

[0005] The purpose of this utility model is to provide a halogen-free, low-smoke, flame-retardant, and fire-resistant cable to solve the problems mentioned in the background art, such as existing cables not using halogen-free materials, which can delay combustion but still produce toxic gases during combustion, and lacking a special fire-resistant structure, making it difficult to simultaneously meet the comprehensive requirements of halogen-free, low-smoke, and fire-resistant, and having obvious deficiencies in high safety standard scenarios, thus failing to meet the usage requirements.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a halogen-free, low-smoke, flame-retardant, and fire-resistant cable, comprising a cable core, the cable core including a conductor and a filling layer, the cable core being wrapped with a halogen-free glass fiber tape layer, the halogen-free glass fiber tape layer being wrapped around the cable core at a 45-degree angle, the halogen-free glass fiber tape layer being surrounded by an inner lining layer, the inner lining layer and the halogen-free glass fiber tape layer being formed by extrusion, the inner lining layer being wrapped with a fire-resistant layer, the fire-resistant layer being surrounded by a composite flame-retardant layer, the composite flame-retardant layer and the fire-resistant layer being formed by extrusion, and the composite flame-retardant layer being surrounded by an outer sheath.

[0007] Preferably, the cable core is provided with three cores, and the three cores are evenly distributed in a ring inside the cable core. The filling layer fills the gap between the three cores, and the filling layer is made of halogen-free flame-retardant rope.

[0008] Preferably, the wire core includes a conductor, an insulation layer, and an isolation layer. The conductor is made of multiple strands of tinned copper wire. The insulation layer is extruded around the outside of the conductor and is made of halogen-free cross-linked polyethylene material. The isolation layer is wrapped around the outside of the insulation layer and is made of low-smoke halogen-free tape.

[0009] Preferably, the inner lining layer is made of halogen-free polyvinyl chloride material, the fire-resistant layer is made of double-sided synthetic mica tape, and the fire-resistant layer is spirally wrapped along the direction of the cable core.

[0010] Preferably, the composite flame retardant layer includes a first flame retardant layer and a second flame retardant layer, with the first flame retardant layer disposed inside the second flame retardant layer. The first flame retardant layer is made of magnesium hydroxide, and the second flame retardant layer is made of halogen-free polyolefin.

[0011] Preferably, the filling layer has three support strips inside, which are located between adjacent wire cores. The support strips are arranged along the direction of the wire cores and are made of halogen-free elastomer material.

[0012] Preferably, the outer sheath is made of low-smoke halogen-free flame-retardant polyolefin material, and the outer surface of the outer sheath is provided with anti-slip stripes, which are integrated with the outer sheath and are longitudinally distributed on the outer surface of the outer sheath.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This utility model device achieves comprehensive performance of halogen-free, low-smoke, flame-retardant and fire-resistant properties through the synergistic effect of a multi-layer structure. The insulation layer and outer sheath are made of halogen-free materials to prevent halogen release from the source. The application of low-smoke materials can reduce the smoke concentration during combustion and improve visibility in fire situations.

[0015] The composite flame-retardant layer of this utility model device adopts a double-layer structure, using a composite system of magnesium hydroxide and halogen-free polyolefin. When magnesium hydroxide is heated and decomposed, it absorbs a large amount of heat and releases water vapor to dilute flammable gases. Combined with the barrier effect of the halogen-free glass fiber wrapping layer, it significantly improves the flame-retardant performance of the cable.

[0016] The fire-resistant layer of this utility model device uses double-sided synthetic mica tape, which has excellent high-temperature resistance and can maintain structural integrity when directly burned by flames, ensuring that the cable can continuously transmit signals or electrical energy for a certain period of time. The support bars enhance the structural stability of the cable core and prevent the core from misaligning when the cable is bent or stretched. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 is a cross-sectional view of the cable core of this utility model;

[0019] Figure 3 is a structural diagram of the composite flame-retardant layer of this utility model;

[0020] Figure 4 is a cross-sectional view of the outer sheath of this utility model.

[0021] In the diagram: 1. Cable core; 2. Fire-resistant layer; 3. Halogen-free glass fiber wrapping layer; 4. Composite flame-retardant layer; 5. Inner lining layer; 6. Outer sheath; 7. Wire core; 8. Filler layer; 9. Conductor; 10. Insulation layer; 11. Separation layer; 12. Support strip; 13. Anti-slip stripe; 14. First flame-retardant layer; 15. Second flame-retardant layer. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Please see Figure 1-4 One embodiment of this utility model is: a halogen-free, low-smoke, flame-retardant, and heat-resistant material.

[0024] The fire-resistant cable includes a cable core 1, which comprises conductors 7 and a filler layer 8. The cable core 1 is externally wrapped with a halogen-free glass fiber tape layer 3, which overlaps and wraps along the cable core 1 at a 45-degree angle. The halogen-free glass fiber tape layer 3 enhances the cable's integrity and halogen-free performance. Glass fiber itself has high insulation resistance, and combined with the halogen-free substrate, it can block current leakage and withstand higher voltages. An inner lining layer 5 is provided outside the halogen-free glass fiber tape layer 3, and the inner lining layer 5 and the halogen-free glass fiber tape layer 3 are formed by extrusion. A fire-resistant layer 2 is wrapped around the inner lining layer 5, and a composite flame-retardant layer 4 is provided outside the fire-resistant layer 2, which is also formed by extrusion. An outer sheath 6 is extruded around the composite flame-retardant layer 4. Three conductors 7 are arranged in a ring shape and evenly distributed inside the cable core 1. The filler layer 8 fills the gaps between the three conductors 7. Layer 8 uses halogen-free flame-retardant rope. Core 7 includes conductor 9, insulation layer 10, and isolation layer 11. Conductor 9 is made of multiple strands of tin-plated copper wire, which improves conductivity and flexibility. Insulation layer 10 is extruded on the outside of conductor 9 and is made of halogen-free cross-linked polyethylene material. Halogen-free cross-linked polyethylene material has good insulation performance and halogen-free characteristics. Isolation layer 11 is wrapped on the outside of insulation layer 10 and is a low-smoke halogen-free tape. Low-smoke halogen-free tape reduces smoke release during combustion. Inner lining layer 5 uses halogen-free polyvinyl chloride material. Halogen-free polyvinyl chloride material does not release toxic gases such as hydrogen chloride when burning, reducing health risks in fire. It has good dielectric properties and can block current conduction, thus protecting the internal structure. Fire-resistant layer 2 uses double-sided synthetic mica tape and is spirally wrapped along the direction of core 1. The overlap rate of fire-resistant layer 2 is not less than 30%, ensuring structural stability at high temperatures.

[0025] Please see Figure 1 and Figure 3 The composite flame-retardant layer 4 includes a first flame-retardant layer 14 and a second flame-retardant layer 15, with the first flame-retardant layer 14 disposed inside the second flame-retardant layer 15. The first flame-retardant layer 14 is made of magnesium hydroxide, and the second flame-retardant layer 15 is made of halogen-free polyolefin. The magnesium hydroxide and halogen-free polyolefin are made by co-extrusion. The flame-retardant properties of magnesium hydroxide can effectively delay the spread of combustion. When heated, magnesium hydroxide decomposes into magnesium oxide and water, absorbing heat and reducing the surface temperature of the material. The water vapor produced by decomposition can dilute the smoke concentration and reduce the generation of toxic gases. When heated, the halogen-free polyolefin decomposes, absorbing heat and releasing water vapor, lowering the temperature and isolating oxygen, further improving the flame-retardant and fire-resistant effect of the cable.

[0026] Please see Figure 1 and Figure 2The filling layer 8 has a support strip 12 inside. There are three support strips 12, and the three support strips 12 are located between adjacent cores 7. The support strips 12 are set along the direction of the cores 7. The support strips 12 are made of halogen-free elastomer material. The setting of the support strips 12 enhances the structural stability of the cable core 1. The halogen-free elastomer material is a polymer material with high elastic recovery. It is made by blending rubber and plastic or chemical modification. It does not produce corrosive and toxic gases such as hydrogen halides when burned or decomposed at high temperature, and has low smoke density.

[0027] Please see Figure 1 and Figure 4 The outer sheath 6 is made of low-smoke halogen-free flame-retardant polyolefin material. The outer surface of the outer sheath 6 is provided with anti-slip stripes 13, and the anti-slip stripes 13 are integrated with the outer sheath 6. The anti-slip stripes 13 are longitudinally distributed on the outer surface of the outer sheath 6. The low-smoke halogen-free flame-retardant polyolefin is a modified material made by adding halogen-free flame retardants and smoke suppressants to polyolefin. It does not produce hydrogen halide gas when burning, avoiding corrosion of the human respiratory tract and secondary damage to electronic equipment. The smoke transmittance is high and the visibility is high when burning, which buys time for fire escape and rescue. The anti-slip stripes 13 improve the cable's wear resistance and ease of installation.

[0028] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A halogen-free, low-smoke, flame-retardant, fire-resistant cable, comprising a cable core (1), characterized in that: The cable core (1) includes a wire core (7) and a filling layer (8). The cable core (1) is wrapped with a halogen-free glass fiber wrapping layer (3), and the halogen-free glass fiber wrapping layer (3) is wrapped around the cable core (1) at a 45-degree angle. The halogen-free glass fiber wrapping layer (3) is surrounded by an inner lining layer (5), and the inner lining layer (5) and the halogen-free glass fiber wrapping layer (3) are formed by extrusion. The inner lining layer (5) is wrapped with a fire-resistant layer (2), and the fire-resistant layer (2) is surrounded by a composite flame-retardant layer (4), and the composite flame-retardant layer (4) and the fire-resistant layer (2) are formed by extrusion. The composite flame-retardant layer (4) is surrounded by an outer sheath (6).

2. The halogen-free, low-smoke, flame-retardant, and fire-resistant cable according to claim 1, characterized in that: The core (7) is provided in three parts, and the three cores (7) are evenly distributed in a ring inside the cable core (1). The filling layer (8) fills the gap between the three cores (7), and the filling layer (8) is made of halogen-free flame-retardant rope.

3. The halogen-free, low-smoke, flame-retardant, and fire-resistant cable according to claim 1, characterized in that: The core (7) includes a conductor (9), an insulation layer (10) and an isolation layer (11). The conductor (9) is made of multiple tin-plated copper wires twisted together. The insulation layer (10) is extruded on the outside of the conductor (9) and is made of halogen-free cross-linked polyethylene material. The isolation layer (11) is wrapped around the outside of the insulation layer (10) and is made of low-smoke halogen-free tape.

4. The halogen-free, low-smoke, flame-retardant, and fire-resistant cable according to claim 1, characterized in that: The inner lining (5) is made of halogen-free polyvinyl chloride material, the fire-resistant layer (2) is made of double-sided synthetic mica tape, and the fire-resistant layer (2) is spirally wrapped along the direction of the cable core (1).

5. The halogen-free, low-smoke, flame-retardant, and fire-resistant cable according to claim 1, characterized in that: The composite flame retardant layer (4) includes a first flame retardant layer (14) and a second flame retardant layer (15), and the first flame retardant layer (14) is disposed inside the second flame retardant layer (15). The first flame retardant layer (14) is made of magnesium hydroxide material, and the second flame retardant layer (15) is made of halogen-free polyolefin material.

6. The halogen-free, low-smoke, flame-retardant, and fire-resistant cable according to claim 1, characterized in that: The filling layer (8) has a support strip (12) inside. There are three support strips (12), and the three support strips (12) are located between adjacent wire cores (7). The support strips (12) are arranged along the direction of the wire cores (7), and the support strips (12) are made of halogen-free elastomer material.

7. The halogen-free, low-smoke, flame-retardant, and fire-resistant cable according to claim 1, characterized in that: The outer sheath (6) is made of low-smoke halogen-free flame-retardant polyolefin material. The outer surface of the outer sheath (6) is provided with anti-slip stripes (13), and the anti-slip stripes (13) are integrated with the outer sheath (6). The anti-slip stripes (13) are longitudinally distributed on the outer surface of the outer sheath (6).

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