Fire resistant, flame retardant, pull resistant power cable

Abstract

This utility model discloses a fire-resistant, flame-retardant, and tensile-resistant power cable, comprising a cable core, which includes conductors and a filling layer. Seven conductors are arranged. An electrostatic shielding layer is arranged on the outside of the cable core. An aluminum foil shielding layer is arranged on the outside of the electrostatic shielding layer. A fireproof wrapping tape is wrapped on the outside of the aluminum foil shielding layer. A flame-retardant layer is wrapped on the outside of the fireproof wrapping tape. An armor layer is arranged on the outside of the flame-retardant layer. A pressure-resistant layer is arranged on the outside of the armor layer. A reinforcing rib is spirally wound on the outside of the pressure-resistant layer. The reinforcing rib has a circular cross-section. A waterproof layer is wrapped on the outside of the pressure-resistant layer. An outer sheath is arranged on the outside of the waterproof layer. The fireproof wrapping tape is a ceramicized silicone rubber tape, which can sinter into a hard ceramic-like carbon shell after being burned by flame, providing excellent fireproof and heat insulation barriers, improving the fire-resistant and flame-retardant performance of the cable. Furthermore, the spirally wound reinforcing rib on the outside of the pressure-resistant layer greatly improves the cable's anti-aging and tensile strength.

Description

Technical Field

[0001] This utility model relates to the field of cable harness technology, specifically a fire-resistant, flame-retardant, and tensile-resistant power cable. Background Technology

[0002] As the core carrier for transmitting electrical energy, power cables are widely used in various fields such as construction, industry, transportation, and energy. With the increasing dependence on electricity and the growing awareness of safety in modern society, the performance requirements for cables in complex and harsh environments are becoming increasingly stringent, especially the ability to maintain the integrity and stability of power transmission under extreme conditions such as fires and mechanical stress.

[0003] Currently, although common power cables on the market possess certain flame-retardant or fire-resistant properties, in practical applications, especially in critical locations such as high-rise building shafts, subway tunnels, nuclear power plants, and large industrial plants, many technical bottlenecks and safety hazards have still been exposed: The contradiction between mechanical protection and functional performance: To enhance the tensile and tear resistance of cables, a metal armor layer (such as steel wire) or high-strength non-metallic reinforcing components (such as aramid yarn) are usually added to the structure. However, the metal armor layer will rapidly lose its mechanical strength under high-temperature flames, and may even melt and drip, exacerbating the fire and damaging the cable structure. Existing technologies have not adequately solved the problem of the reinforcing components' own fire resistance and high-temperature resistance, resulting in the inability to guarantee the mechanical integrity of the cable in a fire environment. Utility Model Content

[0004] The purpose of this invention is to provide a fire-resistant, flame-retardant, and tensile-resistant power cable to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a fire-resistant, flame-retardant, and tensile-resistant power cable, comprising a cable core, the cable core including conductors and a filling layer, the conductors being arranged in seven strands, an electrostatic shielding layer being arranged on the outside of the cable core, an aluminum foil shielding layer being arranged on the outside of the electrostatic shielding layer, a fireproof wrapping tape being wrapped on the outside of the aluminum foil shielding layer, a flame-retardant layer being wrapped on the outside of the fireproof wrapping tape, an armor layer being arranged on the outside of the flame-retardant layer, a pressure-resistant layer being arranged on the outside of the armor layer, a reinforcing rib being spirally wound on the pressure-resistant layer, the reinforcing rib having a circular cross-section, a waterproof layer being wrapped on the outside of the pressure-resistant layer, and an outer sheath being arranged on the outside of the waterproof layer.

[0006] As a further preferred embodiment of this technical solution, the seven wire cores are evenly distributed in a circular array, and the filling layer is disposed in the gaps between the seven wire cores.

[0007] As a further preferred embodiment of this technical solution, the wire core includes a conductor, an insulation layer, and an inner shielding layer. The conductor is made of multiple strands of metal wires twisted together. The insulation layer is disposed outside the conductor, and the inner shielding layer is disposed outside the insulation layer. The conductor, insulation layer, and inner shielding layer are formed by extrusion.

[0008] As a further preferred embodiment of this technical solution, the filling layer is made of flame-retardant filling rope.

[0009] As a further preferred embodiment of this technical solution, the outer sheath is made of polyvinyl chloride.

[0010] As a further preferred embodiment of this technical solution, the fireproof strap is a ceramicized silicone rubber strap.

[0011] This utility model provides a fire-resistant, flame-retardant, and tensile-resistant power cable, which has the following beneficial effects: This invention utilizes a fireproof wrapping tape, which is a ceramicized silicone rubber tape. After being burned by flames, it can sinter into a hard ceramic-like charcoal shell, providing an excellent fireproof and heat insulation barrier. Even if the fire is large and burns off the armor layer, the ceramicized silicone rubber tape can still provide fire protection and promptly form a ceramic-like charcoal shell to ensure the internal functionality.

[0012] This invention utilizes a pressure-resistant layer with reinforcing ribs spirally wound around it. The reinforcing ribs have a circular cross-section and are made of fiberglass, which is high-strength, lightweight, insulating, non-magnetic, and corrosion-resistant. The fiberglass is spirally wound around the cable core at a pitch opposite to the cabling direction. This significantly enhances tensile strength while also improving tensile and aging resistance. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the overall exploded structure of this utility model; Figure 3 This is a schematic cross-sectional view of the overall structure of this utility model; In the diagram: 1. Core wire; 2. Filler layer; 3. Cable core; 4. Fireproof wrapping tape; 5. Compression-resistant layer; 6. Reinforcing rib; 7. Static shielding layer; 8. Aluminum foil shielding layer; 9. Flame retardant layer; 10. Armoring layer; 11. Waterproof layer; 12. Outer sheath. Detailed Implementation

[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0015] This utility model provides a technical solution: such as Figures 1 to 3As shown in this embodiment, a fire-resistant, flame-retardant, and tensile-resistant power cable includes a cable core 3, which includes a conductor core 1 and a filling layer 2. The conductor core 1 has seven conductors. An electrostatic shielding layer 7 is provided on the outside of the cable core 3. An aluminum foil shielding layer 8 is provided on the outside of the electrostatic shielding layer 7. A fireproof wrapping tape 4 is wrapped around the outside of the aluminum foil shielding layer 8. The fireproof wrapping tape is made of ceramicized silicone rubber, which can sinter into a hard ceramic-like charcoal shell after being burned by flames, providing excellent fireproof and heat insulation barriers. Even if the fire is large enough to burn off the armor layer, the ceramicized silicone rubber tape can still provide fireproofing and promptly form a ceramic-like charcoal shell to ensure internal functionality. A flame-retardant layer 9 is wrapped around the outside of the fireproof wrapping tape 4. The flame-retardant layer 9 is made of halogen-free, low-smoke, flame-retardant polyolefin material. The matrix is ​​composed of ethylene (PE) or ethylene-vinyl acetate copolymer (EVA) with a large amount of inorganic flame retardant (mainly aluminum hydroxide ATH or magnesium hydroxide MDH). In case of fire, the flame retardant decomposes endothermically to release water vapor, diluting combustible gases and oxygen, and at the same time generating a high-temperature resistant metal oxide shell to isolate oxygen. An armor layer 10 is provided on the outside of the flame retardant layer 9. The armor layer 10 is an aluminum alloy strip armor. A pressure-resistant layer 5 is provided on the outside of the armor layer 10. A reinforcing rib 6 is spirally wound on the pressure-resistant layer 5. The cross-section of the reinforcing rib 6 is circular. The material of the reinforcing rib 6 is glass fiber, which is high in strength, light in weight, insulating, non-magnetic, and corrosion resistant. The glass fiber is spirally wound with a pitch opposite to the direction of cabling. The effect of enhancing tensile strength is very significant, while improving tensile and anti-aging properties. The outer side of the compression layer 5 is wrapped with a waterproof layer 11. The waterproof layer 11 is made of aluminum-plastic composite tape and is sealed by the adhesive coating or heat-sealing coating of the overlapping part. An outer sheath 12 is provided on the outer side of the waterproof layer 11.

[0016] like Figures 1 to 3 As shown, the seven wire cores 1 are evenly distributed in a circular array, and the filling layer 2 is disposed in the gaps between the seven wire cores 1.

[0017] like Figures 1 to 3 As shown, the wire core 1 includes a conductor, an insulation layer and an inner shielding layer. The conductor is made of multiple strands of metal wires twisted together. The insulation layer is placed outside the conductor, and the inner shielding layer is placed outside the insulation layer. The conductor, insulation layer and inner shielding layer are formed by extrusion.

[0018] like Figures 1 to 3As shown, filler layer 2 is made of flame-retardant filler rope. After multiple insulated cores are cabled, irregular gaps will exist between the cores. The filler rope fills these gaps, making the cable core a complete cylinder. A round cable core allows the subsequent membrane structure to be uniformly covered, avoiding defects such as uneven thickness and eccentricity, and ensuring the mechanical protection performance of the outer sheath. The flame-retardant filler rope is usually made of materials such as glass fiber, polypropylene, and aramid coated or mixed with flame retardants. After the flame burns through the cable outer sheath, these filler ropes will be exposed. They are non-combustible or flame-retardant, and can effectively suffocate oxygen passing through the gaps, preventing the flame from spreading deeper into the cable.

[0019] like Figures 1 to 3 As shown, the outer sheath 12 is made of polyvinyl chloride (PVC), which contains chlorine in its molecules, giving it natural flame retardancy. When exposed to fire, chlorine decomposes, capturing free radicals necessary for combustion and diluting oxygen, thus effectively slowing the spread of flames or even extinguishing them. By adding flame retardants such as antimony trioxide (Sb₂O₃) and zinc borate, its flame retardancy rating can be easily improved to a higher level (e.g., passing IEC 60332-1 single-strand vertical burning test), producing flame-retardant PVC (ZR-PVC), which has excellent resistance to acids, alkalis, salts, oils, most solvents, and humid environments. This makes the cable suitable for use in harsh environments such as chemical plants, sewage treatment plants, and underground direct burial, where chemical corrosion or moisture may occur.

[0020] This utility model provides a fire-resistant, flame-retardant, and tensile-resistant power cable, the specific working principle of which is as follows: When the cable is in use, the PVC outer sheath 12 contains chlorine, which gives it natural flame retardancy. When exposed to fire, chlorine decomposes, capturing free radicals necessary for combustion and diluting oxygen, thus effectively delaying the spread of the flame or even extinguishing it. The waterproof layer 11 is made of aluminum-plastic composite tape, which is sealed by an adhesive coating or heat-sealing coating on the overlapping parts. The pressure-resistant layer 5 is spirally wound with reinforcing ribs 6. The cross-section of the reinforcing ribs 6 is circular. The reinforcing ribs 6 are made of glass fiber, which is high in strength, lightweight, insulating, non-magnetic, and corrosion-resistant. The glass fiber is spirally wound with a pitch opposite to that of the cable. The effect of enhancing tensile strength is very significant, while improving tensile strength and anti-aging properties. The fireproof wrapping tape 4 is wrapped with a flame retardant layer 9 on the outside. The flame retardant layer 9 is made of halogen-free low-smoke flame retardant polyolefin material, with polyethylene (PE) or ethylene-vinyl acetate copolymer (EVA) as the matrix, and a large amount of inorganic flame retardants (mainly aluminum hydroxide ATH or magnesium hydroxide MDH) added. In the event of a fire, the flame retardant absorbs heat and decomposes to release water vapor, diluting combustible gases and oxygen, while generating a high-temperature resistant metal oxide shell. The ceramicized silicone rubber tape can play a fireproof role and form a ceramic-like carbon shell in time to ensure internal functionality.

[0021] 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 fire-resistant, flame-retardant, and tensile-resistant power cable, comprising a cable core (3), characterized in that: The cable core (3) includes a wire core (1) and a filling layer (2). The wire core (1) is provided with seven wires. An electrostatic shielding layer (7) is provided on the outside of the cable core (3). An aluminum foil shielding layer (8) is provided on the outside of the electrostatic shielding layer (7). A fireproof wrapping tape (4) is wrapped on the outside of the aluminum foil shielding layer (8). A flame-retardant layer (9) is wrapped on the outside of the fireproof wrapping tape (4). An armor layer (10) is provided on the outside of the flame-retardant layer (9). A pressure-resistant layer (5) is provided on the outside of the armor layer (10). A reinforcing rib (6) is spirally wound on the pressure-resistant layer (5). The cross-section of the reinforcing rib (6) is circular. A waterproof layer (11) is wrapped on the outside of the pressure-resistant layer (5). An outer sheath (12) is provided on the outside of the waterproof layer (11).

2. The fire-resistant, flame-retardant, and tensile-resistant power cable according to claim 1, characterized in that: The seven cores (1) are evenly distributed in a circular array, and the filling layer (2) is disposed in the gap between the seven cores (1).

3. The fire-resistant, flame-retardant, and tensile-resistant power cable according to claim 1, characterized in that: The core (1) includes a conductor, an insulation layer and an inner shielding layer. The conductor is made of multiple strands of metal wires. The insulation layer is disposed outside the conductor. The inner shielding layer is disposed outside the insulation layer. The conductor, insulation layer and inner shielding layer are formed by extrusion.

4. The fire-resistant, flame-retardant, and tensile-resistant power cable according to claim 1, characterized in that: The filling layer (2) is made of flame-retardant filling rope.

5. The fire-resistant, flame-retardant, and tensile-resistant power cable according to claim 1, characterized in that: The outer sheath (12) is made of polyvinyl chloride.

6. The fire-resistant, flame-retardant, and tensile-resistant power cable according to claim 1, characterized in that: The fireproof strap (4) is a ceramicized silicone rubber strap.

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