Environment-friendly super-high flame-retardant fireproof cable

Abstract

The utility model relates to power cable technical field, more particularly relates to green environmental protection superhigh flame -retardant fire -resistant cable, include: a plurality of line core, the mutual tangent arrangement of adjacent line core, a plurality of flame -retardant filling rope, fill in the gap of line core, flame -retardant wrapping layer, the outer wall of line core and flame -retardant filling rope are wrapped up, and a plurality of line core and flame -retardant filling rope are wrapped up fixed as the cable core of circular section, oxygen barrier layer, extruding the outer wall of flame -retardant wrapping layer. The utility model adopts three -layer composite insulation structure, while ensuring superhigh flame -retardant, by the inside and outside elastic layer effectively inhibiting the embrittlement cracking problem of intermediate flame -retardant layer due to high filling, promotes the flexibility and durability of cable, through filling in the ceramic silica rubber fiber yarn in the conductor stranding gap, and the synergistic effect of the flame -retardant filling rope of homogenous material, the longitudinal spread channel of flame and heat is blocked, satisfies the requirement of dense public place to the safety of escape and power supply guarantee.

Description

Technical Field

[0001] This utility model relates to the field of power cable technology, and more specifically to a green and environmentally friendly ultra-high flame retardant and fireproof cable. Background Technology

[0002] In densely populated public places such as subways, hospitals, and high-rise commercial centers, extremely high requirements are placed on the fire safety performance of cables. Currently, the mainstream products on the market are divided into two categories: one is halogen-containing cables with halogen flame retardants added to the materials, and the other is halogen-free low-smoke cables with a large amount of metal hydroxides (such as aluminum hydroxide).

[0003] While the former can effectively retard flames in a fire, it releases a large amount of highly irritating and corrosive smoke and toxic gases when burning, becoming a major obstacle to people's escape and rescue in a fire and failing to meet green and environmental protection requirements. Although the latter solves the smoke and toxicity problem, the high filling required to achieve a high flame retardancy rating leads to the cable becoming stiff and brittle, making it very easy for the insulation layer to crack during installation and laying. Furthermore, its mechanical strength and durability are significantly reduced, affecting long-term power supply safety. Utility Model Content

[0004] To address the technical problems existing in flame-retardant and fire-resistant cables in the prior art, this utility model proposes a green and environmentally friendly ultra-high flame-retardant and fire-resistant cable, comprising:

[0005] Multiple wire cores arranged so that adjacent wire cores are tangent to each other;

[0006] Multiple flame-retardant filler ropes are used to fill the gaps in the core;

[0007] A flame-retardant wrapping layer is wrapped around the outer wall of the wire core and the flame-retardant filler rope, and multiple wire cores and flame-retardant filler ropes are wrapped together and fixed into a cable core with a circular cross-section.

[0008] An oxygen barrier layer is extruded onto the outer wall of the flame-retardant wrapping layer;

[0009] A braided copper wire shielding layer is wrapped around the outer wall of the oxygen barrier layer;

[0010] The outer sheath is extruded onto the outer wall of the braided copper wire shielding layer;

[0011] The wire core includes a multi-layer stranded conductor and a composite insulation layer disposed outside the conductor. The composite insulation layer includes an inner insulation layer, a middle insulation layer and an outer insulation layer. The inner insulation layer includes a halogen-free low-smoke polyolefin insulation layer, the middle insulation layer includes a halogen-free low-smoke flame-retardant polyolefin insulation layer, and the outer insulation layer includes a halogen-free thermoplastic polyurethane elastic layer.

[0012] The inner and outer insulating layers have higher elasticity than the intermediate insulating layer.

[0013] Preferably, the intermediate insulating layer has the largest thickness among the inner insulating layer, intermediate insulating layer, and outer insulating layer.

[0014] Preferably, the intermediate insulating layer accounts for 60-70% of the total thickness of the composite insulating layer.

[0015] Preferably, the thickness of the inner insulating layer is greater than or equal to the thickness of the outer insulating layer, and the thickness ratio of the inner insulating layer to the outer insulating layer is 2:1 to 1:1.

[0016] Preferably, the conductor comprises a multi-layer stranded structure, each layer of the stranded structure comprising multiple fine copper wires, and flame-retardant fiber yarns are provided between adjacent fine copper wires, the flame-retardant fiber yarns comprising ceramicized silicone rubber fiber yarns.

[0017] Preferably, the flame-retardant filler rope includes ceramicized silicone rubber filler rope or halogen-free flame-retardant polyolefin filler rope.

[0018] Preferably, the oxygen barrier layer comprises a halogen-free, low-smoke, flame-retardant polyolefin structural layer, and the thickness of the oxygen barrier layer is 0.2–0.3 mm.

[0019] Preferably, the braided copper wire shielding layer has a braiding coverage of more than 80% and a braiding angle of 45%.

[0020] Preferably, the outer sheath comprises a highly elastic halogen-free thermoplastic polyurethane sheath layer or a halogen-free low-smoke flame-retardant polyolefin sheath layer.

[0021] Preferably, the flame-retardant wrapping layer includes a glass ribbon wrapping layer.

[0022] Compared with existing technologies, the significant advantages of this utility model's green and environmentally friendly ultra-high flame-retardant fireproof cable are:

[0023] This utility model of a green and environmentally friendly ultra-high flame-retardant fireproof cable adopts a three-layer composite insulation structure. While ensuring ultra-high flame retardancy, the inner and outer elastic layers effectively suppress the embrittlement and cracking problem caused by the high filling of the middle flame-retardant layer, improving the cable's flexibility and durability. By filling the conductor strand gaps with ceramicized silicone rubber fiber yarn, which works synergistically with the flame-retardant filler rope of the same material, it ceramicizes to form a solid skeleton when exposed to fire, blocking the longitudinal spread of flames and heat. Combined with the outer oxygen barrier layer, high coverage braided shielding layer, and high elasticity / high flame-retardant outer sheath, it forms a progressive fire barrier, making the cable a comprehensive safety cable with halogen-free, low-smoke environmental protection characteristics, ultra-high flame-retardant fire resistance rating, excellent mechanical properties, excellent anti-interference ability, and long service life reliability, meeting the requirements of escape safety and power supply guarantee in dense public places. Attached Figure Description

[0024] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings.

[0025] Figure 1 This is a structural schematic diagram of the green and environmentally friendly ultra-high flame retardant fireproof cable shown in this utility model.

[0026] Figure 2 This is a schematic diagram of the cross-sectional structure of the green and environmentally friendly ultra-high flame retardant fireproof cable shown in this utility model.

[0027] Figure 3 This is a schematic diagram of the wire core structure shown in this utility model;

[0028] Figure 4 This is a schematic diagram of the cross-sectional structure of the wire core shown in this utility model. Detailed Implementation

[0029] To better understand the technical content of this utility model, specific embodiments are provided below in conjunction with the accompanying drawings.

[0030] Combination Figures 1 to 4 As shown, the green and environmentally friendly ultra-high flame-retardant fireproof cable of this utility model includes a cable core, an oxygen barrier layer 4, a braided copper wire shielding layer 5, and an outer sheath 6. The oxygen barrier layer 4 is extruded onto the outer wall of the flame-retardant wrapping layer 3; the braided copper wire shielding layer 5 covers the outer wall of the oxygen barrier layer 4; and the outer sheath 6 is extruded onto the outer wall of the braided copper wire shielding layer 5.

[0031] like Figure 1 As shown, multiple cores 1 are arranged tangentially in pairs, multiple flame-retardant filler ropes 2 are filled in the gaps between the cores 1, and a flame-retardant wrapping layer 3 is wrapped around the outer wall of the cores 1 and the flame-retardant filler ropes 2, and the multiple cores 1 and the flame-retardant filler ropes 2 are wrapped together and fixed into a cable core with a circular cross-section.

[0032] The conductor 1 includes a multi-layer stranded conductor 11 and a composite insulation layer disposed outside the conductor 11.

[0033] Furthermore, the conductor 11 includes a multi-layer stranded structure, each layer of the stranded structure including multiple fine copper wires, and flame-retardant fiber yarn 12 is provided between adjacent fine copper wires, the flame-retardant fiber yarn 12 including ceramicized silicone rubber fiber yarn.

[0034] Thus, during normal operation, the ceramicized silicone rubber fiber yarn is flexible and does not affect the conductivity and bending properties of the conductor. In a fire environment, the fiber yarn will quickly sinter into a solid ceramic body, firmly bonding the copper wires together to form a supporting skeleton, effectively preventing the conductor from melting or deforming at high temperatures, and preventing air from flowing longitudinally along the conductor.

[0035] Among them, combined Figure 3 and Figure 4 As shown, the composite insulation layer includes an inner insulation layer 13, an intermediate insulation layer 14, and an outer insulation layer 15. The inner insulation layer 13 includes a halogen-free low-smoke polyolefin insulation layer, the intermediate insulation layer 14 includes a halogen-free low-smoke flame-retardant polyolefin insulation layer, and the outer insulation layer 15 includes a halogen-free thermoplastic polyurethane elastic layer.

[0036] It should be understood that the halogen-free, low-smoke, flame-retardant polyolefin insulation layer 14 of the intermediate insulation layer is filled with a large amount of halogen-free flame retardant (such as aluminum hydroxide and magnesium hydroxide), and has the largest thickness proportion. It is the main flame-retardant functional layer and is responsible for ensuring the overall flame-retardant level of the wire core. The inner and outer layers are made of more elastic materials, and their function is to wrap and protect the brittle intermediate layer.

[0037] The inner halogen-free low-smoke polyolefin insulation layer has good elasticity, which facilitates bending after conductor stranding. The outer halogen-free thermoplastic polyurethane elastic layer also has good elasticity, which can effectively resist external scratches, extrusions and stress during installation, and prevent the middle layer from developing micro-cracks due to mechanical stress, thereby protecting the integrity of the flame-retardant structure and its electrical insulation performance.

[0038] Preferably, the inner insulating layer 13 and the outer insulating layer 15 have higher elasticity than the intermediate insulating layer 14.

[0039] Furthermore, the intermediate insulating layer 14 has the largest thickness among the inner insulating layer 13, the intermediate insulating layer 14, and the outer insulating layer 15.

[0040] Preferably, the intermediate insulating layer 14 accounts for 60-70% of the total thickness of the composite insulating layer. The thickness of the inner insulating layer 13 is greater than or equal to the thickness of the outer insulating layer 15, and the thickness ratio of the inner insulating layer 13 to the outer insulating layer 15 is 2:1 to 1:1.

[0041] In this way, the middle flame-retardant layer can be ensured to have enough volume to exert the flame-retardant effect. At the same time, the slightly thicker inner layer helps the roundness and electric field uniformity of the conductor stranding, while the slightly thinner outer layer can save high-cost TPU material while ensuring sufficient surface protection.

[0042] In an optional embodiment, the flame-retardant filler rope 2 includes a ceramicized silicone rubber filler rope or a halogen-free flame-retardant polyolefin filler rope.

[0043] Thus, in a fire, the flame-retardant filler rope 2 and the flame-retardant fiber yarn 12 in the conductor 11 can work together to rapidly ceramicize, effectively blocking the spread of flames and heat inside the cable core, providing solid mechanical support for the core and preventing it from collapsing and failing.

[0044] Furthermore, the flame-retardant wrapping layer 3 includes a glass ribbon wrapping layer. Thus, through the wrapping of the glass ribbon, in the event of a fire, the softened glass ribbon can be supported by the internal ceramicized structure to form a fire barrier.

[0045] In an optional embodiment, the oxygen barrier layer 4 comprises a halogen-free, low-smoke, flame-retardant polyolefin structural layer, and the thickness of the oxygen barrier layer 4 is 0.2–0.3 mm. The oxygen barrier layer 4 can prevent external oxygen from penetrating into the cable core, inhibit the combustion of internal materials, and when heated, the oxygen barrier layer 4 can form a carbonized layer and release flame-retardant gases, further delaying the spread of the fire.

[0046] In an optional embodiment, the braided copper wire shielding layer 5 has a braiding coverage of more than 80% and a braiding angle of 45%. The braided copper wire shielding layer 5 maintains flexibility, effectively suppresses electromagnetic interference from the outside, and prevents signals inside the cable from radiating outward.

[0047] In an optional embodiment, the outer sheath 6 includes a highly elastic halogen-free thermoplastic polyurethane sheath layer or a halogen-free low-smoke flame-retardant polyolefin sheath layer.

[0048] Among them, the high-elasticity halogen-free thermoplastic polyurethane sheath layer has extremely high wear resistance, tear resistance, impact resistance and flexural strength, and is resistant to oil, grease, chemicals, hydrolysis, low temperature and microbial growth, making it suitable for subway tunnels, industrial plants, mobile equipment and other applications.

[0049] Among them, the halogen-free, low-smoke, flame-retardant polyolefin sheath layer can meet most of the requirements for fixed installation and is suitable for scenarios such as electrical shafts in high-rise commercial buildings and fixed power distribution lines.

[0050] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A green and environmentally friendly ultra-high flame-retardant fireproof cable, characterized in that, include: Multiple wire cores (1), arranged with adjacent wire cores (1) tangent to each other; Multiple flame-retardant filler ropes (2) are filled into the gaps of the core (1); The flame-retardant wrapping layer (3) wraps around the outer wall of the wire core (1) and the flame-retardant filler rope (2), and wraps and fixes multiple wire cores (1) and flame-retardant filler rope (2) together into a cable core with a circular cross section. An oxygen barrier layer (4) is extruded onto the outer wall of the flame-retardant wrapping layer (3); A braided copper wire shielding layer (5) is wrapped around the outer wall of the oxygen barrier layer (4); The outer sheath (6) is extruded onto the outer wall of the braided copper wire shielding layer (5); The wire core (1) includes a multilayer stranded conductor (11) and a composite insulation layer disposed outside the conductor (11). The composite insulation layer includes an inner insulation layer (13), a middle insulation layer (14) and an outer insulation layer (15). The inner insulation layer (13) includes a halogen-free low-smoke polyolefin insulation layer, the middle insulation layer (14) includes a halogen-free low-smoke flame-retardant polyolefin insulation layer, and the outer insulation layer (15) includes a halogen-free thermoplastic polyurethane elastic layer. The inner insulating layer (13) and the outer insulating layer (15) are more elastic than the middle insulating layer (14).

2. The green and environmentally friendly ultra-high flame-retardant fireproof cable according to claim 1, characterized in that, The intermediate insulating layer (14) has the largest thickness among the inner insulating layer (13), the intermediate insulating layer (14), and the outer insulating layer (15).

3. The green and environmentally friendly ultra-high flame-retardant fireproof cable according to claim 1, characterized in that, The intermediate insulating layer (14) accounts for 60-70% of the total thickness of the composite insulating layer.

4. The green and environmentally friendly ultra-high flame-retardant fireproof cable according to claim 3, characterized in that, The thickness of the inner insulating layer (13) is greater than or equal to the thickness of the outer insulating layer (15), and the thickness ratio of the inner insulating layer (13) to the outer insulating layer (15) is 2:1 to 1:

1.

5. The green and environmentally friendly ultra-high flame-retardant fireproof cable according to claim 1, characterized in that, The conductor (11) includes a multi-layer stranded structure, each layer of the stranded structure includes multiple fine copper wires, and flame-retardant fiber yarn (12) is provided between adjacent fine copper wires. The flame-retardant fiber yarn (12) includes ceramicized silicone rubber fiber yarn.

6. The green and environmentally friendly ultra-high flame-retardant fireproof cable according to claim 1, characterized in that, The flame-retardant filler rope (2) includes ceramicized silicone rubber filler rope or halogen-free flame-retardant polyolefin filler rope.

7. The green and environmentally friendly ultra-high flame-retardant fireproof cable according to claim 1, characterized in that, The oxygen barrier layer (4) includes a halogen-free, low-smoke, flame-retardant polyolefin structural layer, and the thickness of the oxygen barrier layer (4) is 0.2~0.3 mm.

8. The green and environmentally friendly ultra-high flame-retardant fireproof cable according to claim 1, characterized in that, The braided copper wire shielding layer (5) has a braided coverage of more than 80% and a braiding angle of 45°.

9. The green and environmentally friendly ultra-high flame-retardant fireproof cable according to claim 1, characterized in that, The outer sheath (6) includes a high-elasticity halogen-free thermoplastic polyurethane sheath layer or a halogen-free low-smoke flame-retardant polyolefin sheath layer.

10. The green and environmentally friendly ultra-high flame-retardant fireproof cable according to any one of claims 1-9, characterized in that, The flame-retardant wrapping layer (3) includes a glass ribbon wrapping layer.

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