Dripping-proof flame-retardant low-smoke halogen-free shell sheath cable
Through multi-layer structural design and material selection, the problem of insufficient flame retardant performance of cables in fire scenarios was solved, and a stable oxygen barrier layer was formed, improving the safety and reliability of the cables.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SINOSTAR CABLE CO LTD
- Filing Date
- 2025-06-18
- Publication Date
- 2026-06-09
AI Technical Summary
Existing cables lack sufficient flame-retardant properties in fire scenarios, are prone to melting and dripping, releasing toxic fumes, and cannot effectively protect the internal insulation layer, resulting in reduced safety and reliability.
It adopts a multi-layer structure design, including an outer shell protective layer, a fireproof layer, an armor layer, a shell oxygen barrier layer, and a reinforced fireproof layer. It uses low-smoke halogen-free shell flame-retardant materials and high-electrical-performance cross-linked polyethylene insulation materials, combined with galvanized steel strip and fiberglass tape wrapping technology to form a stable oxygen barrier layer to prevent the spread of flames.
It significantly reduces the risk of cable combustion in fire situations, prevents the spread of fire, improves the safety and reliability of cables, and protects the safety of personnel and equipment.
Smart Images
Figure CN224342084U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cable technology, and in particular to a drip-proof, flame-retardant, low-smoke, halogen-free sheathed cable. Background Technology
[0002] With the increasing demands for cable safety performance in modern buildings, rail transit, power facilities, and public places, the shortcomings of traditional cables in fire scenarios are becoming increasingly prominent. Although conventional flame-retardant cables have certain flame-retardant properties, they still have the following problems when burning at high temperatures: ordinary polyvinyl chloride and some flame-retardant sheath materials are prone to melting and dripping when burning, causing the flame to spread, igniting combustibles below, and exacerbating the fire risk; halogenated flame-retardant cables release a large amount of toxic fumes when burning, hindering personnel escape and fire rescue; some halogen-free flame-retardant materials cannot form a dense carbonized layer at high temperatures, resulting in a decrease in flame-retardant efficiency and an inability to effectively protect the internal insulation layer, thus causing danger.
[0003] With increasingly stringent environmental policies and growing public concern for health and safety, low-smoke halogen-free materials are gradually becoming a development trend in the cable industry. However, low-smoke halogen-free cables struggle to simultaneously meet the demands of complex application scenarios for high performance and high safety in terms of flame retardancy. While current low-smoke halogen-free cables have solved the problems of smoke and toxicity, their flame retardancy still relies heavily on inorganic fillers, leading to deterioration in the material's mechanical properties. Furthermore, existing cables have poor flame retardancy and form a stable oxygen barrier layer during combustion, which significantly reduces oxygen and heat, thus lowering the cable's safety and reliability and failing to ensure the safety of personnel and equipment. Utility Model Content
[0004] To overcome the above shortcomings, this utility model provides a drip-proof, flame-retardant, low-smoke, halogen-free sheathed cable, which aims to improve the existing technology where the cable has poor flame-retardant effect and forms a stable oxygen barrier layer during combustion, which isolates oxygen and heat to a high degree, thus reducing the safety and reliability of the cable and failing to ensure the safety of personnel and equipment.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A drip-proof, flame-retardant, low-smoke, halogen-free sheathed cable includes a shell outer sheath, a fire-resistant layer disposed in the inner center of the shell outer sheath, an armor layer disposed in the inner center of the fire-resistant layer, a shell oxygen barrier layer disposed in the inner side of the armor layer, a reinforced fire-resistant layer disposed in the inner center of the shell oxygen barrier layer, a filler layer disposed in the inner center of the reinforced fire-resistant layer, and multiple insulating layers disposed in the inner side of each filler layer, with a conductor disposed in the inner side of each insulating layer.
[0007] As a further description of the above technical solution:
[0008] The insulation layer is formed by extrusion of high electrical performance cross-linked polyethylene insulation material.
[0009] As a further description of the above technical solution:
[0010] The conductor is made of multiple strands of annealed copper monofilaments twisted together.
[0011] As a further description of the above technical solution:
[0012] The cross-sectional area of the conductor is between 1.5 and 400 mm². 2 The diameter of the copper monofilament ranges from 0.52 to 2.97 mm, and the diameter deviation of the copper monofilament is ±0.01 mm.
[0013] As a further description of the above technical solution:
[0014] The armor layer is made of two layers of galvanized steel strips with a nominal thickness of 0.2 to 0.5 mm, wrapped with gaps.
[0015] As a further description of the above technical solution:
[0016] The outer protective layer of the crust is extruded from a low-smoke, halogen-free, flame-retardant crust sheath material, with a nominal thickness ranging from 1.8 to 3.7 mm.
[0017] As a further description of the above technical solution:
[0018] The fireproof layer is composed of two layers of fiberglass tape with a nominal thickness of 0.2mm, overlapped and wrapped together.
[0019] This utility model has the following beneficial effects:
[0020] The conductor of this invention is made of multiple strands of annealed copper monofilaments with varying diameters. The copper wires vary depending on the size of the conductor core. The insulation layer uses high-electrical-performance cross-linked polyethylene insulation material, which has good chemical stability and excellent processing performance. The filler uses high-temperature flame-retardant filler rope. The reinforced fireproof layer is composed of a single layer of fiberglass tape of nominal thickness wrapped in layers, providing good thermal insulation performance. The oxygen-barrier shell is extruded from low-smoke, halogen-free, flame-retardant, and oxygen-barrier material. This design significantly reduces the risk of cable combustion in fire situations, prevents the spread of fire, effectively improves the safety and reliability of the cable, and protects the safety of personnel and equipment. Attached Figure Description
[0021] Figure 1 This is a front perspective view of the drip-proof, flame-retardant, low-smoke, halogen-free sheathed cable of this utility model.
[0022] Figure 2 This is a partial structural diagram of the drip-proof, flame-retardant, low-smoke, halogen-free sheathed cable of this utility model.
[0023] Figure 3 This is a partial exploded view of the drip-proof, flame-retardant, low-smoke, halogen-free sheathed cable of this utility model.
[0024] Figure 4 This is a partial structural diagram of the drip-proof, flame-retardant, low-smoke, halogen-free sheathed cable of this utility model.
[0025] Legend:
[0026] 1. Conductor; 2. Insulation layer; 3. Filler layer; 4. Reinforced fireproof layer; 5. Oxygen-barrier shell layer; 6. Armor layer; 7. Fireproof layer; 8. Outer protective shell layer. Detailed Implementation
[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0028] Please see the appendix Figure 1 - Appendix Figure 3 The present invention provides an embodiment of a drip-proof, flame-retardant, low-smoke, halogen-free sheathed cable, comprising an outer sheath 8, a fire-resistant layer 7 disposed in the inner center of the outer sheath 8, an armor layer 6 disposed in the inner center of the fire-resistant layer 7, an oxygen-barrier layer 5 disposed in the inner side of the armor layer 6, a reinforced fire-resistant layer 4 disposed in the inner center of the oxygen-barrier layer 5, a filling layer 3 disposed in the inner center of the reinforced fire-resistant layer 4, a plurality of insulating layers 2 disposed in the inner side of each filling layer 3, and a conductor 1 disposed in the inner side of each insulating layer 2.
[0029] The outer sheath 8 is extruded from a low-smoke halogen-free flame-retardant sheath material with a nominal thickness ranging from 1.8 to 3.7 mm. This material not only has excellent electrical properties, but also forms a stable oxygen barrier layer during combustion, isolating oxygen and heat. At the same time, it produces very few combustion drips. In terms of flame retardancy, the low-smoke halogen-free sheath material has high flame retardancy, which can significantly reduce the risk of cable combustion in fire situations, prevent the spread of fire, effectively improve the safety and reliability of the cable, and protect the safety of personnel and equipment.
[0030] Specifically, conductor 1, as the main component of the cable, is the carrier of electrical energy transmission. It is usually made of highly conductive materials. Insulation layer 2 tightly wraps around the outside of conductor 1 and is a key barrier to prevent current leakage and ensure electrical safety. It is made of materials with high insulation performance. Filler layer 3 is located in the gaps between multiple insulation layers 2 and plays a role in filling and supporting. It is usually made of soft and elastic materials and provides additional protection time for conductor 1 and insulation layer 2 inside the cable. Fireproof layer 7 is set in the middle of the inner side of armor layer 6 and further strengthens the fire protection of the cable.
[0031] Please see the appendix Figure 2 - Appendix Figure 4 Conductor 1 is made of multiple strands of annealed copper monofilaments twisted together, and insulation layer 2 is made of high-electrical-performance cross-linked polyethylene insulation material extruded. The cross-sectional area of conductor 1 ranges from 1.5 to 400 mm². 2 The diameter of the copper monofilament ranges from 0.52 to 2.97 mm, and the diameter deviation of the copper monofilament is ±0.01 mm. The armor layer 6 is made of two layers of galvanized steel strip with a nominal thickness of 0.2 to 0.5 mm wrapped with gaps. The fireproof layer 7 is made of two layers of fiberglass tape with a nominal thickness of 0.2 mm wrapped with overlaps.
[0032] Specifically, conductor 1, as a cable component, is the carrier of current transmission, and its performance directly affects the cable's conductivity and transmission efficiency. The cross-sectional area of conductor 1 in this cable ranges from 1.5 to 400 mm², which can meet the current transmission capacity requirements in different situations. To ensure the stability and consistency of conductor 1's performance, the diameter deviation of the copper single wire is strictly controlled within ±0.01 mm. This dimensional control ensures that the cross-sectional area of conductor 1 is accurate, which not only ensures that the armor layer 6 has a certain degree of flexibility, facilitating cable bending and laying, but also provides sufficient strength. The fireproof layer 7 is the fireproof body of the cable. It can effectively prevent the transmission of flames and heat in the event of a fire, providing additional protection time for conductor 1 and insulation layer 2 inside the cable. The fireproof layer 7 of this cable is composed of two layers of fiberglass tape with a nominal thickness of 0.2 mm, overlapped and wrapped.
[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model 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 utility model should be included within the protection scope of the present utility model.
Claims
1. A drip-proof, flame-retardant, low-smoke, halogen-free sheathed cable, comprising an outer sheath (8), characterized in that: A fireproof layer (7) is provided in the middle of the inner side of the outer protective layer (8). An armor layer (6) is provided in the middle of the inner side of the fireproof layer (7). An oxygen barrier layer (5) is provided in the inner side of the armor layer (6). A reinforced fireproof layer (4) is provided in the middle of the inner side of the oxygen barrier layer (5). A filling layer (3) is provided in the middle of the inner side of the reinforced fireproof layer (4). Multiple insulating layers (2) are provided in the inner side of the filling layer (3). A conductor (1) is provided in the inner side of the insulating layer (2).
2. The drip-proof, flame-retardant, low-smoke, halogen-free sheathed cable according to claim 1, characterized in that: The insulation layer (2) is formed by extrusion of high electrical performance cross-linked polyethylene insulation material.
3. The drip-proof, flame-retardant, low-smoke, halogen-free sheathed cable according to claim 1, characterized in that: The conductor (1) is made of multiple strands of annealed copper monofilaments twisted together.
4. The drip-proof, flame-retardant, low-smoke, halogen-free sheathed cable according to claim 1, characterized in that: The cross-sectional area of the conductor (1) is 1.5 to 400 mm². 2 The diameter of the copper monofilament ranges from 0.52 to 2.97 mm, and the diameter deviation of the copper monofilament is ±0.01 mm.
5. The drip-proof, flame-retardant, low-smoke, halogen-free sheathed cable according to claim 1, characterized in that: The armor layer (6) is made of two layers of galvanized steel strips with a nominal thickness of 0.2 to 0.5 mm wrapped around each other.
6. The drip-proof, flame-retardant, low-smoke, halogen-free sheathed cable according to claim 1, characterized in that: The outer protective layer (8) of the crust is extruded from low-smoke halogen-free crust flame-retardant sheath material, and its nominal thickness ranges from 1.8 to 3.7 mm.
7. The drip-proof, flame-retardant, low-smoke, halogen-free sheathed cable according to claim 1, characterized in that: The fireproof layer (7) is composed of two layers of fiberglass tape with a nominal thickness of 0.2 mm wrapped together.