Corrugated armored flexible fireproof cable

Abstract

This utility model relates to the field of power cable technology, specifically to a corrugated armored flexible fire-resistant cable, comprising: multiple tangential cores and a flame-retardant filler layer between the cores, all wrapped with a flame-retardant tape to form a circular cross-section cable core; a ceramicized silicone rubber oxygen barrier layer extruded onto the outer wall of the cable core; and an armor layer covering the outer wall of the ceramicized silicone rubber oxygen barrier layer. Compared to the traditional steel tape armor + glass tape wrapping structure, the corrugated tape wrapping structure + ceramicized silicone rubber oxygen barrier layer reduces cable weight while improving bending performance, meeting more wiring and laying requirements. The ceramicized silicone rubber oxygen barrier layer and the corrugated tape wrapping structure form a double-layer oxygen barrier, exhibiting better stability at high temperatures and extending fire resistance time.

Description

Technical Field

[0001] This utility model relates to the field of power cable technology, and more specifically to a corrugated armored flexible fireproof cable. Background Technology

[0002] Armored fireproof cables are special cables that combine mechanical protection and fire resistance. Their outer layer is protected against compression, impact, and damage from rodents and insects by metal armor layers such as steel strips and wires, while the inner layer forms a flame-retardant barrier with inorganic materials such as mica tape and magnesium oxide. They can maintain circuit integrity and provide power for more than 90 minutes at high temperatures of 650℃ to 1000℃. They do not release toxic gases when burning and are suitable for high-rise building fire protection systems, subway tunnels, chemical industrial parks, oil and gas platforms, and other scenarios with stringent safety requirements. They can be directly buried or laid underwater and meet the requirements for corrosion resistance and anti-interference, making them a safety guarantee for critical power and signal transmission.

[0003] Traditional fire-resistant cables typically employ a double-layer protective design, consisting of an armor layer and a fiberglass tape wrapping layer. The armor layer provides mechanical strength and impact resistance, while the fiberglass tape wrapping layer, through the flame-retardant properties of inorganic materials, further enhances oxygen-barrier fire resistance. Although this structure performs excellently in terms of fire protection and mechanical protection, the combination of the armor layer and the fiberglass tape wrapping layer significantly increases the overall weight of the cable. This not only increases transportation and installation costs but also severely limits its suitability for overhead or long-distance installations.

[0004] Meanwhile, the rigid superposition of the armor layer and the wrapping layer increases the minimum bending radius of the cable, making it difficult to adapt to the wiring requirements of narrow spaces or complex paths. Utility Model Content

[0005] To address the technical problems existing in fire-resistant cables in the prior art, this utility model proposes a corrugated armored flexible fire-resistant cable, comprising:

[0006] Multiple tangent wire cores, together with the flame-retardant filler layer between the wire cores, are wrapped and secured with flame-retardant tape to form a cable core with a circular cross-section.

[0007] A ceramicized silicone rubber oxygen barrier layer is extruded onto the outer wall of the cable core;

[0008] An armor layer, covering the outer wall of the ceramicized silicone rubber oxygen barrier layer;

[0009] The outer sheath is extruded onto the outer wall of the armor layer;

[0010] The armor layer includes a corrugated tape wrapping structure layer with a wrapping overlap rate of 20-30%. The fireproof structure is formed by combining the ceramicized silicone rubber oxygen barrier layer and the corrugated tape wrapping structure layer, which extends the flame propagation path. The ceramicized silicone rubber is ceramicized at 650°C to form a ceramic shell, which forms an oxygen barrier protective layer.

[0011] The surface of the corrugated strip of the corrugated strip wrapping structure layer is provided with a microporous structure, which penetrates the upper and lower surfaces of the corrugated strip.

[0012] Preferably, the spacing between the crests and troughs of the corrugated strip is 1.5 to 2 mm.

[0013] Preferably, the size of the microporous structure is 50 to 200 micrometers.

[0014] Preferably, the porosity of the microporous structure on the corrugated strip is 30-40%.

[0015] Preferably, the corrugated belt includes a stainless steel corrugated belt or a magnesium-aluminum alloy corrugated belt.

[0016] Preferably, the corrugated tape wrapping structure layer is a double-layer wrapping structure layer.

[0017] Preferably, the wire core includes a conductor, a conductor shielding layer, a polyethylene insulation layer, an insulation shielding layer, and a metal shielding layer.

[0018] Preferably, the conductor shielding layer and the insulating shielding layer include a polyethylene semiconducting shielding layer, and the metal shielding layer includes a copper strip wrapped shielding layer.

[0019] Preferably, the flame-retardant filling layer comprises alkali-free glass fiber filling rope, and the flame-retardant tape comprises double-layer alkali-free glass fiber flame-retardant tape.

[0020] Preferably, the outer sheath comprises a flame-retardant polyvinyl chloride sheath layer.

[0021] Compared to traditional steel tape armor and fiberglass tape wrapping structures, the corrugated armored flexible fireproof cable of this invention uses a corrugated tape wrapping structure and a ceramicized silicone rubber oxygen barrier layer, which can reduce the weight of the cable and improve its bending performance, meeting more wiring and laying needs. The ceramicized silicone rubber oxygen barrier layer and the corrugated tape wrapping structure layer can form a double oxygen barrier, which has good stability at high temperatures and extends the fire resistance time. Attached Figure Description

[0022] Figure 1 This is a structural schematic diagram of the corrugated armored flexible fireproof cable shown in this utility model.

[0023] Figure 2 This is a schematic diagram of the cross-sectional structure of the corrugated armored flexible fireproof cable shown in this utility model.

[0024] Figure 3 This is a schematic diagram of the corrugated belt structure shown in this utility model. Detailed Implementation

[0025] To better understand the technical content of this utility model, specific embodiments are provided below in conjunction with the accompanying drawings.

[0026] Combination Figure 1 As shown, this utility model proposes a corrugated armored flexible fireproof cable, including a cable core, a ceramicized silicone rubber oxygen barrier layer 4, an armor layer 5, and an outer sheath 6.

[0027] like Figure 1 and Figure 2 As shown, multiple tangent wire cores 1, together with the flame-retardant filler layer 2 filling the space between the wire cores 1, are wrapped and secured by a flame-retardant tape 3 to form a cable core with a circular cross-section.

[0028] In an optional embodiment, the wire core 1 includes a conductor 11, a conductor shielding layer 12, a polyethylene insulation layer 13, an insulation shielding layer 14, and a metal shielding layer 15.

[0029] Conductor 11 is a type 2 compacted round copper conductor, conductor shielding layer 12 and insulating shielding layer 14 are polyethylene semiconducting shielding layers, and metal shielding layer 15 includes a copper strip wrapped shielding layer.

[0030] Thus, the conductor shielding layer 12 and the insulating shielding layer 14 formed by polyethylene semiconducting material can homogenize the electric field. The polyethylene semiconducting shielding layer is tightly attached to the inside and outside of the cable insulation layer, which can eliminate the gap between the conductor and the insulation and improve the overall performance of the cable. The copper tape wrapping shielding layer can effectively limit the electromagnetic field generated when the cable is energized to the inside of the insulated core, reduce electromagnetic interference to the external environment, prevent the external electromagnetic field from affecting the internal system, and also ensure the bending performance of the core 1.

[0031] Furthermore, the flame-retardant filler layer 2 includes alkali-free glass fiber filler rope, and the flame-retardant strip 3 includes double-layer alkali-free glass fiber flame-retardant strip.

[0032] Alkali-free fiberglass filler rope and alkali-free fiberglass flame-retardant tape have excellent flame-retardant properties, which can effectively prevent the spread of fire and improve the fire safety of cables. At the same time, alkali-free fiberglass filler rope has good flexibility, which can improve the performance of cables when bending and make them less prone to damage when bending.

[0033] Furthermore, the ceramicized silicone rubber oxygen barrier layer 4 is extruded onto the outer wall of the cable core, and the armor layer 5 is wrapped around the outer wall of the ceramicized silicone rubber oxygen barrier layer 4. The armor layer 5 includes a corrugated tape wrapping structure layer, the wrapping overlap rate of the corrugated tape is 20-30%, and the surface of the corrugated tape 41 is provided with a microporous structure 42.

[0034] Thus, a fireproof structure is formed by the ceramicized silicone rubber oxygen barrier layer 4 and the corrugated tape wrapping structure layer. The corrugated design of the corrugated tape wrapping structure layer can extend the flame propagation path and reduce the combustion speed. The ceramicized silicone rubber can be ceramicized at 650℃ to form a ceramic shell, which blocks oxygen and forms mechanical protection.

[0035] In optional embodiments, such as Figure 3 As shown, the spacing h between the crests and troughs of the corrugated strip 41 is 1.5 to 2 mm, which can strengthen the thickness of the corrugated structure in the diameter direction of the cable and play a role in heat insulation.

[0036] In an optional embodiment, the microporous structure 42 extends through the upper and lower surfaces of the corrugated belt 41, and the size of the microporous structure 42 is 50–200 micrometers. The porosity of the microporous structure 42 on the corrugated belt 41 is 30–40%.

[0037] Thus, by setting the microporous structure 42 on the surface of the corrugated belt 41, the weight of the corrugated belt can be reduced, and the stiffness of the corrugated belt can be reduced, making the bending performance of the wrapping structure of the corrugated belt 41 better. At the same time, the microporous structure can increase the surface area of ​​the corrugated belt 41. During the high-temperature oxidation reaction, the nano-scale Al2O3 / MgO composite oxide layer is preferentially generated at the edge of the micropores, and the oxide layer coverage is increased, achieving better flame retardant and oxygen barrier effects.

[0038] In an optional embodiment, the microporous structure 42 can be formed on the surface of the corrugated strip 41 using a laser selective melting process.

[0039] In an optional embodiment, the corrugated belt includes a stainless steel corrugated belt or a magnesium-aluminum alloy corrugated belt.

[0040] Among them, stainless steel corrugated strips have stronger compressive strength; magnesium-aluminum alloy corrugated strips have lighter weight. At the same time, the magnesium-aluminum alloy oxide layer and ceramic layer formed by magnesium-aluminum alloy corrugated strips can form a continuous oxygen barrier interface, which has a better oxygen barrier and flame retardant effect.

[0041] To further enhance the flame-retardant and oxygen-barrier effect of the corrugated tape wrapping structure layer, a double-layer wrapping structure layer is preferred.

[0042] Furthermore, the outer sheath 6 is extruded onto the outer wall of the armor layer 5, and the outer sheath 6 includes a flame-retardant polyvinyl chloride (PVC) sheath layer. The flame-retardant PVC sheath material has excellent flame-retardant properties, effectively preventing the spread of fire along the cable, thereby improving the cable's fire safety.

[0043] In combination with the above embodiments, compared with the traditional steel tape armor and glass tape wrapping structure, the use of corrugated tape wrapping structure and ceramicized silicone rubber oxygen barrier layer can reduce the weight of the cable and improve the bending performance of the cable, meeting more wiring and laying requirements. The ceramicized silicone rubber oxygen barrier layer and the corrugated tape wrapping structure layer can form a double oxygen barrier, which has good stability at high temperature and extends the fire resistance time.

[0044] 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 corrugated armoured flexible fire resistant cable characterised in that, It comprises: A plurality of linear cores (1) are wound by fire-retardant tape (3) together with fire-retardant filling layer (2) filled between the linear cores (1) to form a cable core with circular cross section; Ceramicized silicone rubber oxygen barrier layer (4) is extruded on the outer wall of the cable core; Armoring layer (5) is coated on the outer wall of the ceramicized silicone rubber oxygen barrier layer (4); Outer sheath (6) is extruded on the outer wall of the armoring layer (5); The armoring layer (5) comprises a corrugated tape wrapping structure layer, the wrapping coverage of the corrugated tape is 20-30%, the combination of the ceramicized silicone rubber oxygen barrier layer (4) and the corrugated tape wrapping structure layer forms a fireproof structure, prolongs the flame propagation path, and forms a ceramic shell by ceramicization of the ceramicized silicone rubber at 650℃ to form an oxygen barrier layer; The surface of the corrugated tape of the corrugated tape wrapping structure layer is provided with a microporous structure (42) penetrating the upper and lower surfaces of the corrugated tape (41).

2. The corrugated armoured flexible fire resistant cable according to claim 1, characterised in that, The size of the microporous structure is 50-200 microns.

3. The corrugated armoured flexible fire resistant cable according to claim 1, characterised in that, The distance between the wave crest and the wave trough of the corrugated tape is 1.5-2 mm.

4. The corrugated armoured flexible fire resistant cable according to claim 1, characterised in that, The porosity of the microporous structure on the corrugated tape is 30-40%, which reduces the weight of the corrugated tape wrapping structure layer.

5. A corrugated armoured flexible fire resistant cable according to any one of claims 1 to 4, characterised in that, The corrugated tape is a stainless steel corrugated tape or a magnesium-aluminum alloy corrugated tape.

6. A corrugated armoured flexible fire resistant cable according to claim 5, characterised in that, The corrugated tape wrapping structure layer is a double-layer wrapping structure layer.

7. The corrugated armoured flexible fire resistant cable according to claim 1, characterised in that, The linear core (1) comprises a conductor (11), a conductor shielding layer (12), a polyethylene insulation layer (13), an insulation shielding layer (14), and a metal shielding layer (15).

8. A corrugated armoured flexible fire resistant cable according to claim 7, characterised in that, The conductor shielding layer (12) and the insulation shielding layer (14) comprise a polyethylene semi-conductive shielding layer, and the metal shielding layer (15) comprises a copper tape wrapping shielding layer.

9. The corrugated armoured flexible fire resistant cable according to claim 1, characterised in that, The fire-retardant filling layer (2) comprises an alkali-free glass fiber filling rope, and the fire-retardant tape (3) comprises a double-layer alkali-free glass fiber fire-retardant tape.

10. The corrugated armoured flexible fire resistant cable according to claim 1, characterised in that, The outer sheath (6) comprises a fire-retardant polyvinyl chloride sheath layer.

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