Medium-voltage fireproof cable

Abstract

The utility model relates to the field of fireproof cables, in particular to a medium-voltage fireproof cable, which comprises three leads, a fireproof filling layer, a steel wire layer and a steel belt layer, the outer surfaces of the leads are fixedly connected with an insulating layer, the outer surface of the insulating layer is fixedly connected with a wrapping layer, the outer surface of the wrapping layer is fixedly connected with a shielding layer, and the shielding layer is fixedly connected with the fireproof filling layer. The outer surfaces of the three shielding layers are fixedly connected with a cabling layer, the outer surface of the cabling layer is fixedly connected with a fireproof filling layer, and the outer surface of the fireproof filling layer is fixedly connected with an inner protection layer; the armored part of the fireproof cable is divided into the steel wire layer and the steel belt layer, mechanical protection is enhanced, external force damage is prevented, flexibility and strength are taken into consideration, the fireproof cable is suitable for complex laying environments, and the problems that although the armored layer of the fireproof cable provides excellent mechanical protection, the flexibility of the cable is reduced due to the hard characteristic of the armored layer, and the cable is damaged are solved. And the installation and wiring difficulty is increased in an environment requiring frequent bending or complex laying.

Description

Technical Field

[0001] This utility model relates to the field of fireproof cables, and in particular to a medium-voltage fireproof cable. Background Technology

[0002] Fire-resistant cables are special cables that maintain circuit integrity and functionality under high temperature or fire conditions. Their core characteristics are excellent fire resistance, high temperature resistance, and flame retardant properties. They typically employ a multi-layered structural design, including a fire-resistant insulation layer, a wrapping layer, a shielding layer, an armor layer, and an outer sheath. This effectively prevents the spread of flames and the generation of smoke in extreme environments, ensuring uninterrupted power or signal transmission. Fire-resistant cables are widely used in high-rise buildings, subways, tunnels, nuclear power plants, and other places with extremely high safety requirements. They are key equipment for ensuring emergency power supply and uninterrupted communication in the event of a fire.

[0003] While the armor layer of fire-resistant cables provides excellent mechanical protection, its rigidity also reduces the cable's flexibility. In environments requiring frequent bending or complex laying, installation and wiring become more difficult. Furthermore, the rigid armor layer may cause stress concentration when the cable is bent, which may damage the internal structure with long-term use.

[0004] Therefore, while the armor layer of the aforementioned fire-resistant cable provides excellent mechanical protection, its rigidity also reduces the cable's flexibility, increasing the difficulty of installation and wiring in environments requiring frequent bending or complex laying. To address this issue, a medium-voltage fire-resistant cable can be designed with an armor layer composed of a steel wire layer and a steel strip layer. Summary of the Invention

[0005] To overcome the problem that while the armor layer of fire-resistant cables provides excellent mechanical protection, its rigidity also reduces the cable's flexibility, increasing the difficulty of installation and wiring in environments requiring frequent bending or complex laying.

[0006] The technical solution of this utility model is as follows: a medium-voltage fireproof cable, including conductors, a fireproof filling layer, a steel wire layer, and a steel strip layer. There are three conductors. An insulation layer is fixedly connected to the outer surface of the conductors. A wrapping layer is fixedly connected to the outer surface of the insulation layer. A shielding layer is fixedly connected to the outer surface of the wrapping layer. A cabling layer is fixedly connected to the outer surface of the three shielding layers. A fireproof filling layer is fixedly connected to the outer surface of the cabling layer. An inner sheath is fixedly connected to the outer surface of the fireproof filling layer. A steel wire layer is fixedly connected to the outer surface of the inner sheath. A steel strip layer is fixedly connected to the outer surface of the steel wire layer. An outer sheath is fixedly connected to the outer surface of the steel strip layer.

[0007] Preferably, the armor of the fire-resistant cable consists of a steel wire layer and a steel tape layer. This enhances mechanical protection against external damage while maintaining flexibility and strength, making it suitable for complex laying environments. Meanwhile, the fire-resistant filling layer is made of ceramicized silicone rubber, which forms a heat insulation barrier under high temperature or fire conditions, effectively protecting the internal structure of the cable and maintaining circuit integrity. This makes the armor layer of the fire-resistant cable not only provide excellent mechanical protection but also increase the cable's flexibility. In environments requiring frequent bending or complex laying, the difficulty of installation and wiring is reduced, and the internal structure is protected.

[0008] Preferably, the material used for the wrapping layer is a semi-conductive strip, and the material used for the shielding layer is a copper strip.

[0009] As a preferred option, the materials used in the cabling layer are fiberglass rope and halogen-free flame-retardant tape, and the cabling layer integrates the core wires.

[0010] Preferably, the steel wire layer is made of galvanized steel wire braid, and the steel strip layer is made of galvanized steel strip.

[0011] Preferably, the inner sheath is made of polyvinyl chloride and the outer sheath is made of polyethylene.

[0012] Preferably, the shielding layer is made of aluminum foil, and the average thickness of the outer sheath is 4.9-5.2 mm.

[0013] As a preferred option, the overlap rate of the steel strip layer is %, and the outer diameter of the steel strip layer is 125mm.

[0014] The beneficial effects of this utility model are:

[0015] The armor of fire-resistant cables consists of a steel wire layer and a steel tape layer. While enhancing mechanical protection against external damage, it also ensures flexibility and strength, making it suitable for complex laying environments. Meanwhile, the fire-resistant filling layer is made of ceramicized silicone rubber, which can form a heat insulation barrier under high temperature or fire conditions, effectively protecting the internal structure of the cable and maintaining circuit integrity. This makes the armor layer of fire-resistant cables not only provide excellent mechanical protection but also increase the flexibility of the cable. In environments that require frequent bending or complex laying, the difficulty of installation and wiring is reduced, and the internal structure is protected. Attached Figure Description

[0016] Figure 1 The diagram shown is a three-dimensional structural schematic of a medium-voltage fireproof cable according to this utility model.

[0017] Figure 2 The diagram shown is a three-dimensional side cross-sectional view of a medium-voltage fireproof cable according to this utility model.

[0018] Figure 3 The diagram shown is a three-dimensional side cross-sectional view of the steel wire layer of a medium-voltage fireproof cable according to this utility model.

[0019] Figure 4 The diagram shown is a three-dimensional side cross-sectional view of the steel strip layer of a medium-voltage fireproof cable according to this utility model.

[0020] Explanation of reference numerals in the attached diagram: 1. Conductor; 2. Insulation layer; 3. Wrapping layer; 4. Shielding layer; 5. Cable layer; 6. Fireproof filling layer; 7. Inner sheath; 9. Steel wire layer; 10. Steel strip layer; 11. Outer sheath. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Please see Figures 1-4 This utility model provides an embodiment: a medium-voltage fireproof cable includes a conductor 1, and further includes a fireproof filling layer 6, a steel wire layer 9, and a steel strip layer 10. Three conductors 1 are provided. An insulation layer 2 is fixedly connected to the outer surface of the conductor 1. A wrapping layer 3 is fixedly connected to the outer surface of the insulation layer 2. A shielding layer 4 is fixedly connected to the outer surface of the wrapping layer 3. A cabling layer 5 is fixedly connected to the outer surface of the three shielding layers 4. A fireproof filling layer 6 is fixedly connected to the outer surface of the cabling layer 5. An inner sheath 7 is fixedly connected to the outer surface of the fireproof filling layer 6. A steel wire layer 9 is fixedly connected to the outer surface of the inner sheath 7. The fire-resistant cable has a steel strip layer 10, and an outer sheath 11 is fixedly connected to the outer surface of the steel strip layer 10. The armored part of the fire-resistant cable is divided into a steel wire layer 9 and a steel strip layer 10. While enhancing mechanical protection to prevent damage from external forces, it also takes into account flexibility and strength, making it suitable for complex laying environments. At the same time, the fire-resistant filling layer 6 is made of ceramicized silicone rubber, which can form a heat insulation barrier under high temperature or fire conditions, effectively protecting the internal structure of the cable and maintaining the integrity of the circuit. This makes the armored layer of the fire-resistant cable not only provide excellent mechanical protection, but also increase the flexibility of the cable. In environments that require frequent bending or complex laying, the difficulty of installation and wiring is reduced, and the internal structure is protected.

[0023] Please see Figures 1-2 In this embodiment, the material used for the wrapping layer 3 is semi-conductive tape, and the material used for the shielding layer 4 is copper tape. The wrapping layer 3 enhances insulation and prevents mechanical damage, while the shielding layer 4 prevents electromagnetic interference and protects signal transmission. The material used for the cabling layer 5 is fiberglass rope and halogen-free flame-retardant tape. The cabling layer 5 integrates the wire core. The material used for the steel wire layer 9 is galvanized steel wire braid, and the material used for the steel strip layer 10 is galvanized steel strip. The steel wire layer 9 and the steel strip layer 10 combine flexibility and strength, making them suitable for complex laying environments.

[0024] Please see Figures 1-2In this embodiment, the inner sheath 7 is made of polyvinyl chloride, and the outer sheath 11 is made of polyethylene. The inner sheath 7 protects the internal structure and prevents mechanical damage and chemical corrosion. The shielding layer 4 is made of aluminum foil. The outer sheath 11 has an average thickness of 4.9-5.2 mm and provides final protection against environmental erosion. The overlap rate of the steel strip layer 10 is %, and the outer diameter of the steel strip layer 10 is 125 mm.

[0025] During operation, the armored portion of the fire-resistant cable consists of a steel wire layer 9 and a steel tape layer 10. While enhancing mechanical protection against external damage, it also ensures flexibility and strength, making it suitable for complex laying environments. Meanwhile, the fire-resistant filler layer 6 is made of ceramicized silicone rubber, which can form a heat insulation barrier under high temperature or fire conditions, effectively protecting the internal structure of the cable and maintaining circuit integrity. The wrapping layer 3 enhances insulation and prevents mechanical damage. The shielding layer 4 prevents electromagnetic interference and protects signal transmission. The inner sheath 7 protects the internal structure and prevents mechanical damage and chemical corrosion. The outer sheath 11 provides final protection against environmental erosion. The insulation layer 2 prevents current leakage and ensures electrical insulation.

[0026] Through the above steps, the armor of the fire-resistant cable is divided into a steel wire layer 9 and a steel tape layer 10. While enhancing mechanical protection to prevent damage from external forces, it also takes into account flexibility and strength, making it suitable for complex laying environments. At the same time, the fire-resistant filling layer 6 is made of ceramicized silicone rubber, which can form a heat insulation barrier under high temperature or fire conditions, effectively protecting the internal structure of the cable and maintaining circuit integrity. This addresses the problem that although the armor layer of the fire-resistant cable provides excellent mechanical protection, its rigidity also reduces the flexibility of the cable. In environments that require frequent bending or complex laying, the difficulty of installation and wiring increases. Secondly, the rigid armor layer may cause stress concentration when the cable is bent, which may damage the internal structure with long-term use.

Claims

1. A medium-voltage fireproof cable, comprising a conductor (1); characterized in that: It also includes a fireproof filling layer (6), a steel wire layer (9) and a steel strip layer (10). There are three conductors (1). An insulation layer (2) is fixedly connected to the outer surface of the conductor (1). A wrapping layer (3) is fixedly connected to the outer surface of the insulation layer (2). A shielding layer (4) is fixedly connected to the outer surface of the wrapping layer (3). A cabling layer (5) is fixedly connected to the outer surface of the three shielding layers (4). A fireproof filling layer (6) is fixedly connected to the outer surface of the cabling layer (5). An inner protective layer (7) is fixedly connected to the outer surface of the fireproof filling layer (6). A steel wire layer (9) is fixedly connected to the outer surface of the inner protective layer (7). A steel strip layer (10) is fixedly connected to the outer surface of the steel wire layer (9). An outer protective layer (11) is fixedly connected to the outer surface of the steel strip layer (10).

2. The medium-voltage fireproof cable according to claim 1, characterized in that: The material used for the wrapping layer (3) is a semi-conductive strip, and the material used for the shielding layer (4) is a copper strip.

3. A medium-voltage fire-resistant cable according to claim 1, characterized in that: The materials used in the cabling layer (5) are fiberglass rope and halogen-free flame-retardant tape.

4. A medium-voltage fire-resistant cable according to claim 1, characterized in that: The steel wire layer (9) is made of galvanized steel wire braid, and the steel strip layer (10) is made of galvanized steel strip.

5. A medium-voltage fire-resistant cable according to claim 2, characterized in that: The inner protective layer (7) is made of polyvinyl chloride, and the outer protective layer (11) is made of polyethylene.

6. A medium-voltage fire-resistant cable according to claim 5, characterized in that: The material used for the shielding layer (4) is aluminum foil, and the average thickness of the outer sheath (11) is 4.9-5.2 mm.

7. A medium-voltage fire-resistant cable according to claim 4, characterized in that: The overlap rate of the steel strip layer (10) is 15%, and the outer diameter of the wrapping of the steel strip layer (10) is 125mm.

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