Super flexible fire resistant cable

Abstract

The utility model discloses a kind of super-soft fireproof cables, including the line core assembly, buffer layer, fireproof layer, outer insulating layer and sheath layer that are sequentially sleeved from inside to outside;Wherein the buffer layer includes elastomer and hollow glass beads, and the hollow glass beads are evenly distributed in the elastomer.The super-soft fireproof cable provided by the utility model compared with prior art, by optimizing conductor structure, adding buffer layer structure, buffer layer includes elastomer and hollow glass beads, hollow glass beads are evenly distributed in elastomer, for absorbing bending stress, solve the technical problem of poor flexibility of existing cable.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, specifically to an ultra-flexible fireproof cable. Background Technology

[0002] To ensure data security, it's crucial to have sufficient time to recover all data and transfer it to a safe location before the entire network collapses in the event of a fire, minimizing the possibility of data loss. Therefore, cable standards include a category of fire-resistant standards called "line integrity" standards. Its goal is for cables to maintain operational continuity during a fire, ensuring the continued transmission of power and information. Cables meeting these integrity requirements are thus known as fire-resistant cables.

[0003] Current fire-resistant cables have a simple conductor stranding structure and high hardness of insulation and sheath materials, resulting in a large bending radius and making them difficult to adapt to the needs of laying in narrow spaces. Utility Model Content

[0004] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and propose an ultra-flexible fireproof cable to solve the technical problem that the existing fireproof cables have high hardness, large bending radius, and are not suitable for laying in narrow spaces.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: This utility model provides an ultra-flexible fireproof cable, comprising, from the inside out, a core assembly, a buffer layer, a fireproof layer, an outer insulation layer, and a sheath layer; wherein the buffer layer comprises an elastomer and hollow glass microspheres, and the hollow glass microspheres are uniformly distributed within the elastomer.

[0006] In some embodiments, the core assembly includes a conductor portion comprising a plurality of twisted conductors, the conductors being tin-plated copper wires.

[0007] In some embodiments, the core assembly further includes an aramid fiber layer spirally wound around the conductor portion.

[0008] In some embodiments, the fireproof layer includes a nano-mica tape wrapping layer, which is sleeved on the elastic body.

[0009] In some embodiments, the fireproof layer further includes a ceramicized silicone rubber extrusion layer, which is sleeved on the outside of the nano-mica tape wrapping layer.

[0010] In some embodiments, the nanomica tape wrapping layer and the ceramicized silicone rubber extrusion layer are bonded together by a silane coupling agent adhesive layer.

[0011] In some embodiments, the outer insulation layer is made of a low-smoke, halogen-free, flame-retardant polyolefin material, and a plurality of annular grooves are formed on the surface of the outer insulation layer along its length.

[0012] In some embodiments, the sheath layer includes a neoprene rubber layer, which is sleeved over the outer insulation layer.

[0013] In some embodiments, the sheath layer further includes an abrasion-resistant braided layer, which is sleeved over the neoprene rubber layer.

[0014] In some embodiments, the sheath layer further includes a sheath layer, which is sleeved over the abrasion-resistant braided layer, and a plurality of tensile fiber ropes are embedded in the sheath layer along its length.

[0015] Compared with the prior art, the ultra-flexible fireproof cable provided by this utility model optimizes the conductor structure and adds a buffer layer structure. The buffer layer includes an elastomer and hollow glass microspheres. The hollow glass microspheres are evenly distributed in the elastomer to absorb bending stress, thus solving the technical problem of poor flexibility of existing cables. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the ultra-flexible fireproof cable provided in this embodiment of the utility model. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0018] To address the technical problems of high hardness and poor flexibility in existing fire-resistant cables, this invention provides an ultra-flexible fire-resistant cable with high flexibility, suitable for laying in narrow spaces.

[0019] Please see Figure 1 , Figure 1 This is a cross-sectional view of the ultra-flexible fireproof cable provided in this embodiment of the utility model.

[0020] This ultra-flexible fire-resistant cable comprises, from the inside out, a core assembly 1, a buffer layer 2, a fire-resistant layer 3, an outer insulation layer 4, and a sheath layer 5. The buffer layer 2 includes an elastomer and hollow glass microspheres, with the hollow glass microspheres evenly distributed within the elastomer. During bending, the hollow glass microspheres absorb bending stress, improving the cable's bending performance and enhancing its flexibility.

[0021] In some embodiments, the core assembly 1 includes a conductor portion 11, which includes multiple stranded conductors, the conductors being tin-plated copper wires. The diameter of each conductor is ≤0.15mm, and the stranding pitch ratio is 8:1 to 12:1.

[0022] In some embodiments, the core assembly 1 further includes an aramid fiber layer 12, which is spirally wound around the conductor portion 11. The winding density is 15 to 20 turns / cm along the length of the fire-resistant cable, forming a flexible support skeleton.

[0023] In some embodiments, the elastomer is extruded from silicone rubber elastomer with a thickness of 0.3–0.8 mm, and contains hollow glass microspheres with a diameter of 0.2–0.5 mm that are uniformly distributed inside. The density of the hollow glass microspheres is ≤0.6 g / cm³. The total volume of the hollow glass microspheres accounts for 15%–25% of the buffer layer 2.

[0024] In some embodiments, the fireproof layer 3 includes a nano-mica tape wrapping layer 31, which is sleeved on the elastic body. The thickness of the nano-mica tape wrapping layer 31 is 0.1–0.3 mm.

[0025] In some embodiments, the fireproof layer 3 further includes a ceramicized silicone rubber extrusion layer 32, which is sleeved on the outside of the nano-mica tape wrapping layer 31. The thickness of the ceramicized silicone rubber extrusion layer 32 is 0.5–1.0 mm.

[0026] In some embodiments, the nano-mica tape wrapping layer 31 and the ceramicized silicone rubber extrusion layer 32 are bonded together by a silane coupling agent adhesive layer 33. The thickness of the silane coupling agent adhesive layer 33 is 0.01 to 0.03 mm, and the bonding strength is ≥1.5 N / mm. The function of the silane coupling agent adhesive layer 33 is to prevent high-temperature delamination.

[0027] In some embodiments, the outer insulation layer 4 is made of a low-smoke, halogen-free, flame-retardant polyolefin material with an oxygen index ≥32% and a thickness of 0.5–1.2 mm. A plurality of annular grooves are formed on the surface of the outer insulation layer 4 along its length to enhance mechanical engagement with the sheath layer 5. The depth of the annular grooves is preferably 0.2–0.4 mm.

[0028] In some embodiments, the sheath layer 5 includes a neoprene rubber layer 51, which is sleeved over the outer insulation layer 4. The thickness of the neoprene rubber layer 51 is 0.8–1.5 mm, and its Shore A hardness is 60–70.

[0029] In some embodiments, the sheath layer 5 further includes a wear-resistant braided layer 52, which is fitted over the neoprene rubber layer 51. The wear-resistant braided layer 52 has a thickness of 0.3 to 0.6 mm and is made of a mixture of glass fiber and stainless steel wire.

[0030] In some embodiments, the sheath layer 5 further includes a sheath layer 53, which is sleeved over the abrasion-resistant braided layer 52. A plurality of tensile fiber ropes 531 are embedded in the sheath layer 53 along its length. The tensile fiber ropes 531 are generally 2 to 4, evenly distributed circumferentially, made of Dyneema fiber, with a diameter of 0.5 to 1.0 mm and a breaking strength ≥500 N.

[0031] This ultra-flexible fire-resistant cable boasts superior flexibility. The conductor's finer diameter stranding and elastic aramid fiber skeleton reduce rigidity, while the hollow glass microspheres in the buffer layer 2 disperse bending stress, resulting in a minimum bending radius of ≤3D, where D is the cable's outer diameter. This surpasses the 6D requirement of GB / T12706 standard and meets the requirements for laying cables on curved sections of rail transit lines.

[0032] In terms of fire resistance enhancement, the nano-mica tape is resistant to high temperatures and remains stable even at 1000℃. The ceramicized silicone rubber forms a ceramic layer at high temperatures with a thermal conductivity ≤0.4W / (m·K). The silane coupling agent bonding layer 33 ensures that the two layers work together to resist fire. This ultra-flexible fireproof cable can continuously supply power for ≥60 minutes under a flame at 750℃ and passes the fire resistance test of GB / T 19216.21.

[0033] In terms of mechanical protection, the neoprene rubber layer 51 absorbs vibration, the wear-resistant braided layer 52 resists external friction, and the tensile fiber rope 531 enhances tensile strength. This results in a tensile strength of ≥2500N, a wear resistance of ≥5000 cycles, and a 30% increase in service life for the fire-resistant cable.

[0034] In summary, this ultra-flexible fire-resistant cable enhances flexibility through conductor fine-diameter stranding and an elastic fiber yarn skeleton. The nano-mica tape and ceramicized silicone rubber composite fire-resistant layer are bonded together with a silane coupling agent to solve the problem of interlayer separation. The sheath layer 5 employs an elastic rubber + wear-resistant braided + tensile-strength fiber rope structure to enhance mechanical protection. This cable combines high flexibility (bending radius ≤ 3D), reliable fire resistance (fire resistance ≥ 60 minutes), and excellent mechanical strength, making it suitable for applications in construction, rail transportation, and other scenarios.

[0035] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. An ultra-flexible fire-resistant cable, characterized in that, It includes, from the inside out, a core assembly, a buffer layer, a fireproof layer, an outer insulation layer, and a sheath layer; wherein the buffer layer includes an elastomer and hollow glass microspheres, and the hollow glass microspheres are uniformly distributed within the elastomer.

2. The ultra-flexible fire-resistant cable according to claim 1, characterized in that, The core assembly includes a conductor section, which comprises multiple stranded conductors, the conductors being tin-plated copper wires.

3. The ultra-flexible fire-resistant cable according to claim 2, characterized in that, The core assembly also includes an aramid fiber layer, which is spirally wound around the conductor portion.

4. The ultra-flexible fire-resistant cable according to claim 1, characterized in that, The fireproof layer includes a nano-mica tape wrapping layer, which is sleeved on the elastic body.

5. The ultra-flexible fire-resistant cable according to claim 4, characterized in that, The fireproof layer also includes a ceramicized silicone rubber extrusion layer, which is sleeved on the outside of the nano-mica tape wrapping layer.

6. The ultra-flexible fire-resistant cable according to claim 5, characterized in that, The nano-mica tape wrapping layer and the ceramicized silicone rubber extrusion layer are bonded together by a silane coupling agent adhesive layer.

7. The ultra-flexible fire-resistant cable according to claim 1, characterized in that, The outer insulation layer is made of low-smoke, halogen-free, flame-retardant polyolefin material, and several annular grooves are formed on the surface of the outer insulation layer along its length.

8. The ultra-flexible fire-resistant cable according to claim 1, characterized in that, The sheath layer includes a neoprene rubber layer, which is sleeved over the outer insulation layer.

9. The ultra-flexible fire-resistant cable according to claim 8, characterized in that, The sheath layer also includes a wear-resistant braided layer, which is fitted over the neoprene rubber layer.

10. The ultra-flexible fire-resistant cable according to claim 9, characterized in that, The sheath layer further includes a sheath layer, which is fitted over the wear-resistant braided layer, and a plurality of tensile fiber ropes are embedded in the sheath layer along its length.

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