Low-smoke halogen-free flame-retardant insulated cable

Abstract

The utility model discloses a low-smoke halogen-free flame-retardant insulated cable, which belongs to the technical field of cables and comprises a cable core unit, a filling layer is arranged outside the cable core unit, an inner fireproof wrapping tape is wound outside the filling layer, an inner lining layer is arranged outside the inner fireproof wrapping tape, an armor layer is arranged outside the inner lining layer, and an outer sheath is arranged outside the armor layer. A spiral groove is formed in the outer surface of the outer sheath, an outer fireproof wrapping tape is wound on the groove bottom wall of the spiral groove in the rotating direction of the spiral groove, and fireproof coatings are coated on the outer surface of the outer sheath except the groove bottom wall of the spiral groove. According to the low-smoke halogen-free flame-retardant insulated cable provided by the utility model, the internal and external common fireproof function is realized, the external fireproof wrapping tape can be prevented from being easily damaged, the torsion resistance and the pressure resistance are strong, and the damage of the cable is reduced.

Description

Technical Field

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

[0002] Flame-retardant cables are cables that can prevent or delay the spread of fire in extreme situations such as fires. Flame retardancy is one of the most important characteristics of flame-retardant cables. Typically, flame-retardant cables are manufactured using special flame retardant formulations and processes, ensuring that the cable does not generate a high combustion temperature when exposed to open flames. Even at high temperatures, they can continuously transmit electricity without short-term power outages, ensuring the continuity and stability of power transmission.

[0003] Currently, flame-retardant cables typically rely on internal fire-resistant materials for their fire-resistant properties. For example, a fire-resistant layer is placed between the outer sheath and the armor layer. When the outer sheath is ignited, the fire-resistant layer can limit the spread of flames inward, thus preventing the cable from burning rapidly. However, in this type of cable, the fire-resistant layer located inside the outer sheath does not significantly contribute to the fire resistance of the outer sheath. The fire-resistant layer only plays its main role when the outer sheath is burning, which is not conducive to its rapid response. Furthermore, the compressive and torsional resistance of existing flame-retardant cables needs improvement. Utility Model Content

[0004] The technical problem to be solved by this utility model is that the fire resistance of the cable exterior is poor and the compressive and torsional resistance needs to be strengthened. Based on this, this utility model provides a low-smoke halogen-free flame-retardant insulated cable.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a low-smoke halogen-free flame-retardant insulated cable, including a cable core unit, a filling layer provided on the outside of the cable core unit, an inner fireproof wrapping tape wound around the outside of the filling layer, an inner lining layer provided on the outside of the inner fireproof wrapping tape, an armor layer provided on the outside of the inner lining layer, an outer sheath provided on the outside of the armor layer, a spiral groove is formed on the outer surface of the outer sheath, an outer fireproof wrapping tape is wound around the bottom wall of the spiral groove along the spiral direction of the spiral groove, and a fireproof coating is applied to the outer surface of the outer sheath except for the bottom wall of the spiral groove.

[0006] Furthermore, the width W of the spiral groove is half the pitch length P of the spiral groove.

[0007] Furthermore, both the inner and outer fireproof straps are made of fiberglass material.

[0008] Furthermore, the fire-retardant coating is made of silicone fire-retardant coating, polyurethane fire-retardant coating, or alkyd resin fire-retardant coating.

[0009] Furthermore, the cable core unit includes a conductor, a fire-resistant layer, and an insulation layer, wherein the fire-resistant layer is disposed outside the conductor, and the insulation layer is disposed outside the fire-resistant layer.

[0010] Furthermore, the filler layer is made of silicone material.

[0011] Furthermore, the inner lining is made of PVC material.

[0012] Furthermore, the armor layer is made of steel strip or steel wire.

[0013] Furthermore, the outer sheath is made of polyvinyl chloride or polyethylene material.

[0014] The beneficial effects of this utility model are as follows: The low-smoke halogen-free flame-retardant insulated cable of this utility model has an inner fireproof wrapping tape and an outer fireproof wrapping tape that can form a fireproof barrier, thereby playing a fireproof role inside and outside the cable respectively, minimizing the risk of the cable being ignited. The outer fireproof wrapping tape is set on the bottom wall of the spiral groove, so that the outer surface of the outer fireproof wrapping tape with the outer sheath has a certain height difference, which can effectively prevent the outer fireproof wrapping tape from directly contacting foreign objects, thereby preventing the outer fireproof wrapping tape from being easily damaged, while enhancing the torsional resistance. In addition, the spiral groove can buffer some pressure and reduce the damage to the cable caused by pressure. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a front view of the low-smoke halogen-free flame-retardant insulated cable of this utility model.

[0017] Figure 2 yes Figure 1 The image shows a cross-sectional view of a low-smoke, halogen-free, flame-retardant insulated cable along AA.

[0018] In the diagram: 1. Cable core unit, 11. Conductor, 12. Fire-resistant layer, 13. Insulation layer, 2. Filler layer, 3. Inner fireproof wrapping tape, 4. Inner lining layer, 5. Armor layer, 6. Outer sheath, 61. Spiral groove, 62. Fireproof coating, 7. Outer fireproof wrapping tape. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0020] Please see Figure 1 , Figure 2This utility model provides a low-smoke halogen-free flame-retardant insulated cable, including a cable core unit 1. The cable core unit 1 is provided with a filling layer 2 on the outside. The filling layer 2 is wrapped with an inner fireproof wrapping tape 3. The inner fireproof wrapping tape 3 is provided with an inner lining layer 4 on the outside. The inner lining layer 4 is provided with an armor layer 5 on the outside. The armor layer 5 is provided with an outer sheath 6 on the outside. A spiral groove 61 is formed on the outer surface of the outer sheath 6. An outer fireproof wrapping tape 7 is wrapped on the bottom wall of the spiral groove 61 along the spiral direction of the spiral groove 61. The outer surface of the outer sheath 6, except for the bottom wall of the spiral groove 61, is coated with a fireproof coating 62.

[0021] This utility model discloses a low-smoke, halogen-free, flame-retardant insulated cable. The inner fireproof wrapping tape 3 and the outer fireproof wrapping tape 7 form a fire barrier. The inner fireproof wrapping tape 3 effectively isolates the flame from contact with the outer layers, while the outer fireproof tape 7 effectively isolates the flame from contact with the inner layers, minimizing the risk of the cable igniting. A fire-retardant coating 62 is applied to the surface of the outer sheath 6, further preventing flame propagation and extending the time required for the outer sheath 6 to ignite, ensuring the cable can continuously transmit power even at high temperatures.

[0022] In addition, the spiral groove 61 on the outer surface of the outer sheath 6 can act as a buffer chamber. When the cable is deformed under pressure, the spiral groove 61 can buffer part of the pressure, reducing damage to the cable caused by pressure. Furthermore, the spiral groove 61 increases the outer surface area of ​​the outer sheath 6, which helps the heat on the cable to dissipate to the outside atmosphere in a timely manner. Simultaneously, the outer fireproof wrapping tape 7 is placed on the bottom wall of the spiral groove 61, creating a certain height difference between the outer fireproof wrapping tape 7 and the outer surface of the outer sheath 6. This effectively prevents the outer fireproof wrapping tape 7 from directly contacting external objects, thus preventing easy damage. Furthermore, the outer fireproof wrapping tape 7 is tightly spirally wound around the outer sheath 6, enabling the cable to better withstand axial stress, improving the cable's stability and durability, and enhancing its torsional resistance, preventing the internal cable core unit 1 from breaking due to excessive twisting.

[0023] In a preferred embodiment, the width W of the spiral groove 61 is half the pitch P of the spiral groove 61. This ensures both the effective winding area of ​​the outer fireproof wrapping tape 7 and a sufficient contact area on the outer surface of the outer sheath 6 for contact with external objects, resulting in significant support and ensuring effective protection. Furthermore, because the outer fireproof wrapping tape 7 is spirally wound, no tape cutting is required after each turn, enabling continuous processing and high production efficiency.

[0024] In this embodiment, both the inner fireproof banding 3 and the outer fireproof banding 7 are made of fiberglass material. It is understood that in other embodiments, the inner fireproof banding 3 and the outer fireproof banding 7 may also be made of refractory materials such as silicone rubber or EPDM rubber.

[0025] The material for the fire-retardant coating 62 can be a silicone fire-retardant coating, a polyurethane fire-retardant coating, or an alkyd resin fire-retardant coating, which are available in the prior art.

[0026] The cable core unit 1 includes a conductor 11, a fire-resistant layer 12, and an insulation layer 13. The fire-resistant layer 12 is disposed outside the conductor 11, and the insulation layer 13 is disposed outside the fire-resistant layer 12. In this embodiment, the conductor 11 is copper wire, and the fire-resistant layer 12 is made of a low-smoke halogen-free material to achieve good fire resistance. The insulation layer 13 is made of silicone material. As a preferred embodiment, there are four cable core units 1, which are evenly distributed within the filler layer 2.

[0027] The filler layer 2 provides support and filling for the internal structure of the cable, protecting it from compression and wear, thereby ensuring the cable's normal service life. In this embodiment, the filler layer 2 is made of silicone material. Silicone has stable chemical properties, heat resistance, and cold resistance, effectively protecting the cable core unit 1 and buffering vibration and supporting loads.

[0028] The inner lining layer 4 serves as a concentric layer between the filling layer 2 and the armor layer 5, mainly playing a role in isolation to prevent the armor layer 5 from damaging the filling layer 2 and the inner fireproof wrapping tape 3. In this embodiment, the inner lining layer 5 is made of PVC material.

[0029] Armor layer 5 protects the cable from external pressure and abrasion during installation and use, thus extending its service life. Furthermore, armor layer 5 provides shielding, reducing electromagnetic interference and ensuring the cable's operational stability in low-frequency environments. Armor layer 5 can be made of steel strip or steel wire.

[0030] The outer sheath 6 is used to prevent damage to the cable from physical, chemical, and other factors during use, ensuring that the cable has long-term stable and reliable transmission and safety performance. The outer sheath 6 can be made of polyvinyl chloride or polyethylene.

[0031] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A low-smoke halogen-free flame-retardant insulated cable, comprising a core unit, wherein a filler layer is disposed on the outside of the core unit, characterized in that: The filling layer is wrapped with an inner fireproof wrapping tape, the inner fireproof wrapping tape is surrounded by an inner lining layer, the inner lining layer is surrounded by an armor layer, the armor layer is surrounded by an outer sheath, the outer surface of the outer sheath has a spiral groove, the bottom wall of the spiral groove is wrapped with an outer fireproof wrapping tape along the spiral direction, and the outer surface of the outer sheath is coated with a fireproof coating except for the bottom wall of the spiral groove.

2. The low-smoke halogen-free flame-retardant insulated cable as described in claim 1, characterized in that: The width W of the spiral groove is half the pitch length P of the spiral groove.

3. The low-smoke halogen-free flame-retardant insulated cable as described in claim 1, characterized in that: Both the inner and outer fireproof straps are made of fiberglass material.

4. The low-smoke halogen-free flame-retardant insulated cable as described in claim 1, characterized in that: The fire-retardant coating is made of silicone fire-retardant coating, polyurethane fire-retardant coating, or alkyd resin fire-retardant coating.

5. The low-smoke halogen-free flame-retardant insulated cable as described in any one of claims 1-4, characterized in that: The cable core unit includes a conductor, a fire-resistant layer, and an insulation layer. The fire-resistant layer is disposed outside the conductor, and the insulation layer is disposed outside the fire-resistant layer.

6. The low-smoke halogen-free flame-retardant insulated cable as described in any one of claims 1-4, characterized in that: The filler layer is made of silicone material.

7. The low-smoke halogen-free flame-retardant insulated cable as described in any one of claims 1-4, characterized in that: The inner lining is made of PVC material.

8. The low-smoke halogen-free flame-retardant insulated cable as described in any one of claims 1-4, characterized in that: The armor layer is made of steel strip or steel wire.

9. The low-smoke halogen-free flame-retardant insulated cable as described in any one of claims 1-4, characterized in that: The outer sheath is made of polyvinyl chloride or polyethylene.

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