Ultra-flexible low-smoke flame-retardant cable

Abstract

The utility model discloses an ultra-flexible low-smoke flame-retardant cable, which relates to the technical field of wires and cables and comprises a conductor, an insulating layer, a shielding layer and a sheath layer are sequentially arranged on the outer side of the conductor, flame-retardant silica gel is filled between the shielding layer and the insulating layer, a mica tape is arranged between the shielding layer and the sheath layer, and a sheath layer is arranged on the outer side of the sheath layer. The conductor is made of high-purity oxygen-free copper, the conductor is wrapped by a flame-retardant glass fiber tape during cabling, and gaps of the conductor are filled with ceramic silicone rubber. Through the twisting of a nano modified material, a multi-layer flame-retardant structure and a superfine conductor, the super-flexibility, low-smoke and high-flame-retardant performance is realized, and the cable is suitable for high-frequency movement and fireproof safety scenes in a harsh environment.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric wire and cable, specifically is a super flexible low smoke retardant cable. BACKGROUND

[0002] The flame-retardant cable is the cable that the sample is burned under the prescribed test condition, the flame spreads only in the limited range after the test fire source is removed, and the afterflame or afterglow can self-extinguish in the limited time. The basic characteristic is: it is possible to be burned under the fire condition and cannot run, but can prevent the spread of fire. In popular terms, if the electric wire catches fire, it can limit the burning in a local range, does not spread, saves other various equipment, and avoids causing greater loss. But in the flame-retardant cable, a relatively thick fireproof smoke suppression layer or a multilayer flame-retardant smoke suppression conclusion is usually designed, so that the cable is very heavy and the flexibility is reduced.

[0003] For example, the Chinese patent with the publication number CN219085709U discloses a flexible B1 flame-retardant fireproof cable, which comprises a conductor group, a first tape layer and a sheath layer are sequentially wrapped outside the conductor group, a fireproof material is filled between the conductor group and the tape layer, the conductor group is twisted by a plurality of root conductors, the conductor is sequentially composed of a conductor, a second tape layer and an insulation layer from inside to outside, the fireproof material is a high-temperature-resistant flame-retardant fireproof PP rope, and the insulation layer is a 125-degree low-smoke halogen-free flame-retardant crosslinked polyolefin elastomer rubber sleeve, etc. Technical scheme, which can reduce the bending radius of the cable, improve the flame-retardant performance, and thus make the cable have good flexibility, small bending radius and high flame-retardant performance.

[0004] However, when the cable is used, it is difficult to prevent the heat spread from the sheath layer to the conductor to affect the normal power transmission of the conductor group only by the oxygen barrier layer, the fireproof material, the insulation layer and the protective layer. Utility model content

[0005] The technical problem to be solved by the utility model is to overcome the defects of the prior art, provide a super flexible low smoke retardant cable, and realize super flexibility, low smoke, high flame-retardant performance by using nano modified material, multilayer flame-retardant structure and ultrafine conductor stranding, which is suitable for high-frequency movement and fire safety scenes in harsh environments.

[0006] In order to solve the above technical problems, the technical scheme of the utility model is: a super flexible low smoke retardant cable, comprising a conductor, an insulation layer, a shielding layer and a sheath layer are sequentially arranged on the outer side of the conductor, fire-retardant silica gel is filled between the shielding layer and the insulation layer, mica tape is arranged between the shielding layer and the sheath layer, high-purity oxygen-free copper is used as the conductor material, flame-retardant glass fiber tape is used for wrapping the cable, and ceramicized silicone rubber is filled in the gaps of the conductors.

[0007] Further, the conductor is layered and twisted by superfine copper wires, and high molecular fibers are added during the layered and twisted process.

[0008] Further, the base material of the insulation layer adopts cross-linked polyolefin, and nano-sized magnesium hydroxide is added as a flame retardant.

[0009] Further, the thickness of the insulation layer is 0.3-0.5mm.

[0010] Further, the shielding layer adopts a composite shielding layer formed by spirally winding an aluminum foil and braiding a tinned copper wire, the coverage is greater than or equal to 85%, and the thickness of the single shielding layer is less than or equal to 0.1mm.

[0011] Further, the base material of the sheath layer adopts low-smoke halogen-free flame-retardant thermoplastic polyurethane, and a phosphorus-nitrogen intumescent flame-retardant system is added as an additive in the base material.

[0012] Further, the thickness of the sheath layer is 1.0-1.2mm.

[0013] Further, the sheath layer is embedded with an aramid fiber braiding layer.

[0014] By using the above technical scheme, the following beneficial effects are achieved: the nanometer modified material, the multi-layer flame-retardant structure and the superfine conductor twisting are used to realize the super flexibility, low smoke and high flame-retardant performance, and the cable is suitable for high-frequency movement and fire safety scenes in harsh environments. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 FIG. 1 is a structural schematic view of the super flexible low-smoke flame-retardant cable.

[0016] Reference signs: 1, conductor; 2, insulation layer; 3, shielding layer; 4, sheath layer; 5, flame-retardant silicone;

[0017] 6, mica tape; 11, flame-retardant glass fiber tape; 12, ceramicized silicone rubber; 41, aramid fiber braiding layer. DETAILED DESCRIPTION

[0018] In order to make the content of the utility model more easily and clearly understood, the utility model is further described in detail below according to specific embodiments and in combination with the drawings.

[0019] In the embodiment, a super flexible low-smoke flame-retardant cable is provided, which comprises a conductor 1, and the conductor 1 is sequentially provided with an insulation layer 2, a shielding layer 3 and a sheath layer 4 on the outer side, the material of the conductor 1 adopts high-purity oxygen-free copper, the conductor 1 is wrapped by a flame-retardant glass fiber tape 11 when being formed into a cable, and the conductor 1 is filled with ceramicized silicone rubber 12 in the gaps.

[0020] In this embodiment, the conductor 1 adopts a category 6 conductor 1, which is layered twisted by superfine copper wires (diameter 0.08-0.15 mm) with a twisting pitch ≤12 times the diameter of the conductor 1, ensuring a bending life ≥100,000 times. High-molecular fibers such as aramid yarn are added during the layered twisting to enhance the tensile strength and avoid core breakage caused by frequent bending.

[0021] In this embodiment, the conductor 1 has multiple groups, and the multiple groups of conductor 1 are cabled by "S-Z twisting", which can reduce internal stress and improve the bending radius.

[0022] In this embodiment, the base material of the insulation layer 2 adopts cross-linked polyolefin, and nano-magnesium hydroxide is added as a flame retardant, accounting for 20-30%. This ensures flexibility while achieving high flame retardancy (oxygen index ≥32%), and at the same time, the addition of silicone as a modifier in the cross-linked polyolefin can reduce the friction coefficient and improve the bending resistance.

[0023] In this embodiment, the insulation layer 2 is 0.3-0.5 mm thick and adopts an extrusion process to ensure that the insulation layer 2 can uniformly cover the surface of the conductor 1.

[0024] In this embodiment, the shielding layer 3 adopts a composite shielding made of spiral-wound aluminum foil and plated tin copper wire weaving, with a coverage rate ≥85% and a thickness ≤0.1 mm for single-layer shielding. This makes the shielding layer 3 have the characteristics of anti-interference and lightweight, while balancing flexibility and shielding effectiveness.

[0025] In this embodiment, the shielding layer 3 is filled with flame-retardant silicone 5 between the insulation layer 2, enhancing the high-temperature resistance.

[0026] In this embodiment, the base material of the sheath layer 4 adopts low-smoke halogen-free flame-retardant thermoplastic polyurethane, with a hardness range of 75A-85A, and a phosphorus-nitrogen intumescent flame-retardant system (IFR) is added as an additive in the base material, which forms a dense carbon layer during combustion to suppress smoke.

[0027] In this embodiment, the sheath layer 4 is 1.0-1.2 mm thick, with an aramid fiber braiding layer 41 embedded inside to improve the tensile strength (≥15 MPa) and tear resistance, and a micro-texture treatment is applied to the outer surface of the sheath layer 4 to reduce the frictional resistance during installation.

[0028] In this embodiment, a mica tape 6 is provided between the shielding layer 3 and the sheath layer 4, which wraps around the outer surface of the shielding layer 3, further improving the flame-retardant and high-temperature-resistant performance of the cable.

[0029] In this embodiment, the ceramicized silicone rubber 12 filled in the gaps between the conductors 1 is sintered into a ceramic layer above 600°C, which can block flames and prevent the conductors 1 from being burned.

[0030] The utility model provides a kind of superflexible low smoke flame-retardant cable, by nano modified material, multilayer flame-retardant structure and ultrafine conductor 1 stranding, to realize superflexibility, low smoke, high flame-retardant performance, it is applicable to the high frequency movement and fire safety scene under harsh environment.

[0031] The above-described specific embodiments further detail the technical problems solved by the utility model, technical solutions and beneficial effects. It should be understood that the above-described specific embodiments are merely examples of the utility model and are not intended to limit the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the utility model should be included within the scope of protection of the utility model.

Claims

1. A super flexible low smoke, zero halogen cable characterized in that: The conductor (1) is provided with an insulating layer (2), a shielding layer (3) and a sheath layer (4) in sequence from outside, the shielding layer (3) is filled with fire-retardant silica gel (5) between the insulating layer (2), the mica tape (6) is arranged between the shielding layer (3) and the sheath layer (4), the conductor (1) is made of high-purity oxygen-free copper, the conductor (1) is wrapped by fire-retardant glass fiber tape (11) when cabling, and the conductor (1) is filled with ceramicized silicone rubber (12) in the gap.

2. A super flexible low smoke and zero halogen cable as claimed in claim 1, wherein: The conductor (1) is layered stranded by superfine copper wires, and high molecular fibers are added during layered stranding.

3. The ultra-flexible low-smoke flame-retardant cable according to claim 1, characterized in that: The base material of the insulating layer (2) is cross-linked polyolefin, and nano-magnesium hydroxide is added as a flame retardant.

4. A super flexible low smoke and zero halogen cable as claimed in claim 1, wherein: The thickness of the insulating layer (2) is 0.3-0.5mm.

5. The ultra-flexible low-smoke flame-retardant cable according to claim 1, characterized in that: The shielding layer (3) is made of spiral-wound aluminum foil and plated tin copper wire to be woven into a composite shield, the coverage is greater than or equal to 85%, and the thickness of a single layer shield is less than or equal to 0.1mm.

6. A super flexible low smoke and zero halogen cable as claimed in claim 1, wherein: The base material of the sheath layer (4) is low-smoke halogen-free flame-retardant thermoplastic polyurethane, and a phosphorus-nitrogen intumescent flame-retardant system is added as an additive in the base material.

7. The ultra-flexible low-smoke flame-retardant cable according to claim 1, characterized in that: The thickness of the sheath layer (4) is 1.0-1.2mm.

8. The ultra-flexible low-smoke flame-retardant cable according to claim 1, characterized in that: The sheath layer (4) is embedded with aramid fiber woven layer (41).

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