Fire resistant cable under building fire temperature conditions

Abstract

The utility model discloses a kind of fire-resistant cables under building fire temperature condition, including cable core, the outside of cable core is covered with porous ceramic support, the outside of porous ceramic support is equipped with multilayer composite fireproof layer, the outside of multilayer composite fireproof layer is equipped with heat-absorbing gasket layer, the outside of heat-absorbing gasket layer is evenly distributed with groove along circumference, the outside of heat-absorbing gasket layer is equipped with metal armoring layer, the inside of metal armoring layer is arranged and extends to the extension body inside groove, the inside of groove is filled with heat-absorbing composite filler;The outer surface of metal armoring layer is equipped with low-smoke halogen-free sheath;The utility model can adapt to the environment of closed, high temperature, with external impact inside building facility, improve the high-temperature-resistant fire performance and impact resistance of cable, effectively prolong the normal working time of cable in high temperature, with external impact environment.

Claims

1. A fire resistant cable for use in buildings under fire conditions of temperature rise comprising a cable core (1) characterised in that, The cable core (1) is covered with a porous ceramic support (2), the porous ceramic support (2) is covered with a multi-layer composite fire-resistant layer (3), the multi-layer composite fire-resistant layer (3) is covered with a heat-absorbing pad layer (4), the heat-absorbing pad layer (4) is evenly provided with grooves (5) along the circumferential direction, the heat-absorbing pad layer (4) is covered with a metal armor layer (6), the inside of the metal armor layer (6) is provided with an extension extending into the groove (5), the inside of the groove (5) is filled with heat-absorbing composite filler; the outside of the metal armor layer (6) is covered with a low-smoke halogen-free sheath (7).

2. A fire resistant cable according to claim 1, characterised in that The multi-layer composite fire-resistant layer (3) includes a fire-resistant layer (31), an insulation layer (32), and a fire-resistant layer (33). The fire-resistant layer (31) has a double-layer wrapping structure, and the insulation layer (32) is filled between the fire-resistant layer (31) and the fire-resistant layer (33).

3. A fire resistant cable according to claim 2, characterised in that, The fireproof layer (33) includes a ceramic silica mud matrix (331), the interior of which is embedded with a stainless steel wire mesh, and a spiral groove (332) is provided on the outer surface of the ceramic silica mud matrix (331).

4. A fire resistant cable according to claim 2, characterised in that, The insulating layer (32) includes an EVA matrix (321), a flame retardant layer (322), and a ceramic filler layer (323). The ceramic filler layer (323) is filled between the EVA matrix (321) and the flame retardant layer (322), and silicon carbide fibers are disposed inside the ceramic filler layer (323).

5. A fire-resistant cable under building fire heating conditions according to claim 2, characterized in that, The refractory layer (31) includes a synthetic mica tape (311) and a ceramicized silicone rubber tape (312). The synthetic mica tape (311) is wrapped around the outside of the porous ceramic support (2), and the ceramicized silicone rubber tape (312) is wrapped alternately around the outside of the synthetic mica tape (311) to form a double-layer wrapping structure.

6. A fire resistant cable according to any one of claims 1 to 5, characterised in that, The heat-absorbing pad layer (4) includes a heat-absorbing composite substrate (41). Several grooves (5) are evenly distributed along the circumference on the outer side of the heat-absorbing composite substrate (41). The grooves (5) are filled with heat-absorbing composite filler. A metal armor layer (6) is fitted on the outside of the heat-absorbing composite substrate (41).

7. A fire-resistant cable under building fire heating conditions according to claim 6, characterized in that, The metal armor layer (6) includes a stainless steel strip (61) and an aluminum alloy strip (62). The stainless steel strip (61) is wound around the outside of the padding layer (4). An extension extending into the groove (5) is provided on the inner side of the stainless steel strip (61). The aluminum alloy strip (62) is wound around the outside of the stainless steel strip (61).

8. A fire resistant cable according to claim 7, characterised in that, The extension includes a stainless steel tab, the extension depth of which is greater than or equal to half the depth of the groove (5).

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