Ceramic mineral insulation flame-retardant flexible fire-resistant cable

Abstract

The utility model relates to the technical field of wires and cables, in particular to a ceramic mineral insulated flame-retardant flexible fire-resistant cable, which comprises a plurality of insulated wire cores, the plurality of elastic flame-retardant wire cores, the plurality of insulated wire cores and the flame-retardant filling rope are wrapped by a wrapping tape to form a cable core with a circular cross section; the fire retardant layer is extruded on the outer wall of the cable core; the outer wall of the fire-retardant layer is coated with the oxygen-isolation fire-resistant layer; and the outer sheath is coated on the outer wall of the oxygen-isolating fire-resistant layer. According to the fire-resistant cable of the utility model, the cable core is formed by twisting the insulating wire core, the elastic flame-retardant wire core and the flame-retardant rope together, and when the cable is bent, the insulating wire core can extrude the elastic flame-retardant wire core to deform the elastic flame-retardant wire core, so that the bending stress of the insulating wire core and the whole cable is reduced, and the durability of the cable is improved; and the elastic flame-retardant wire core is constructed to be of a hollow structure, and the flame-retardant structure filled in the elastic flame-retardant wire core is matched with the flame-retardant rope to form a flame-retardant barrier on the outer layer of the insulating wire core, so that the overall flame-retardant capability of the cable is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric wire and cable, and concretely relates to a ceramicized mineral insulation flame-retardant flexible fire-resistant cable. BACKGROUND

[0002] The flexible fire-resistant cable is a cable that is made by winding a mineral insulation material outside a conductor and then wrapping a metal sheath. It combines many advantages such as fire resistance, high temperature resistance, large current-carrying capacity, impact voltage resistance, mechanical damage resistance, safety, and long service life. It can be widely used in various fields such as high-rise buildings, petrochemical industry, steel smelting, transportation, medical equipment, and data centers. In emergency situations such as fire, it can maintain the integrity of the circuit and provide necessary power support for personnel evacuation and rescue.

[0003] Currently, the cable core of the fire-resistant cable is composed of multiple twisted insulation cores, and the gaps are filled with flame-retardant ropes or other flame-retardant materials. This structure causes the insulation cores to bear a large bending stress when the cable is bent, and the cores may be damaged due to stress concentration during long-term use, which is not conducive to improving the durability of the cable. SUMMARY

[0004] To solve the technical problems of the existing flexible fire-resistant cable, the utility model provides a ceramicized mineral insulation flame-retardant flexible fire-resistant cable, which comprises:

[0005] a plurality of insulation cores;

[0006] a plurality of elastic flame-retardant cores, which are wrapped together with the plurality of insulation cores and the flame-retardant filling ropes to form a cable core with a circular cross-section;

[0007] a fire barrier layer, which is extruded on the outer wall of the cable core;

[0008] an oxygen-resistant fire-resistant layer, which is wrapped on the outer wall of the fire barrier layer;

[0009] an outer sheath, which is wrapped on the outer wall of the oxygen-resistant fire-resistant layer;

[0010] Preferably, the cross-sectional area of the core layer is less than 1 / 9 of the cross-sectional area of the elastic flame-retardant core.

[0011] Preferably, the flame-retardant structure is set as a paste-like flame-retardant structure.

[0012] Preferably, the flame-retardant structure is set as a paste-like flame-retardant structure.

[0013] Preferably, the insulated core comprises, from inside to outside, an oxygen-free copper conductor, a semi-conductive wrapping layer, an inorganic insulation layer and a metal shielding layer.

[0014] Preferably, the oxygen-free copper conductor comprises a plurality of twisted oxygen-free copper wires, the semi-conductive wrapping layer comprises a semi-conductive non-woven fabric wrapping tape layer, the semi-conductive non-woven fabric wrapping tape has one layer of wrapping, and the wrapping coverage is greater than or equal to 15%.

[0015] Preferably, the metal shielding layer comprises a copper tape wrapping layer, and the copper tape wrapping coverage is 20-30%.

[0016] Preferably, the inorganic insulation layer comprises a ceramicized halogen-free low-smoke flame-retardant polyolefin.

[0017] Preferably, the fire-retardant layer comprises a ceramicized silicone rubber fire-retardant layer.

[0018] Preferably, the oxygen barrier fire-resistant layer comprises a corrugated copper sleeve.

[0019] Preferably, the outer sheath comprises an environmentally friendly polyurethane elastic sheath.

[0020] Compared with the prior art, the advantages of the utility model lie in that:

[0021] The fire-resistant cable of the utility model, the cable core is twisted together by the insulated core, the elastic flame-retardant core and the flame-retardant rope, when the cable is bent, the insulated core can extrude the elastic flame-retardant core to deform, thereby reducing the bending stress of the insulated core and the whole cable, which is beneficial to improve the durability of the cable, and the elastic flame-retardant core is constructed as a hollow structure, the flame-retardant structure filled in the inside can form a flame-retardant barrier outside the insulated core together with the flame-retardant rope, effectively improving the flame-retardant capacity of the whole cable. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings are not intended to be drawn to scale. In the drawings, each same or approximately same component shown in each drawing can be denoted by the same reference numeral. For the sake of clarity, not every component is labeled in each drawing. Embodiments of various aspects of the present utility model will now be described by way of example with reference to the accompanying drawings, in which:

[0023] Figure 1 is a structural schematic view of the ceramicized mineral insulation flame-retardant flexible fire-resistant cable shown in the utility model. DETAILED DESCRIPTION

[0024] In order to better understand the technical content of the utility model, specific embodiments are described below in combination with the accompanying drawings.

[0025] In combination with Figure 1As shown, the utility model provides a kind of ceramic mineral insulation flame-retardant flexible fire-resistant cable, it mainly includes cable core, fire barrier 5, oxygen barrier fireproof layer 6 and outer sheath 7.

[0026] Cable core is by multiple insulated wire core, multiple elastic flame-retardant wire core 2 and flame-retardant filling rope 3 together with wrapping tape 4 to form.

[0027] As Figure 1 As shown, elastic flame-retardant wire core 2 is filled in the gap of insulated wire core, and flame-retardant filling rope 3 is also filled in the gap of insulated wire core and elastic flame-retardant wire core 2, so that cable core is more round, and also has better flame-retardant capacity.

[0028] In optional embodiment, insulated wire core includes oxygen-free copper conductor 11, semi-conductive wrapping layer 12, inorganic insulation layer 13 and metal shielding layer 14 distributed from inside to outside.

[0029] Among them, oxygen-free copper conductor 11 includes multiple twisted oxygen-free copper wires, semi-conductive wrapping layer 12 includes semi-conductive non-woven fabric wrapping tape layer, and the number of wrapping layers of semi-conductive non-woven fabric wrapping tape is one, and wrapping lap rate is greater than or equal to 15%.

[0030] In this way, by wrapping semi-conductive non-woven fabric wrapping tape multiple twisted oxygen-free copper wires, conductor is more compact, and has better tensile capacity, and also reduces the uneven degree of electric field on the surface of inorganic insulation layer 13.

[0031] Among them, inorganic insulation layer 13 can be selected as ceramic halogen-free low-smoke flame-retardant polyolefin, so that insulation layer has the characteristics of high-temperature ceramic, flame-retardant self-extinguishing, low-smoke non-toxic and high dielectric strength, which can significantly improve the fire resistance grade and insulation strength of cable.

[0032] In optional embodiment, metal shielding layer 14 includes copper tape wrapping layer, and copper tape wrapping lap rate is 20-30%.

[0033] In this way, by copper tape wrapping, the fire resistance and shielding performance of each insulated wire core can be improved, and compared with longitudinal copper tape or copper sleeve, it has the advantage of small bending stress.

[0034] In combination with the above, the hardness of insulated wire core is relatively large, so when elastic flame-retardant wire core 2 and insulated wire core are twisted, two adjacent insulated wire cores keep not in contact, so when cable is bent, hard contact between insulated wire cores is avoided, and adjacent insulated wire cores deform elastic flame-retardant wire core 2 by extruding elastic flame-retardant wire core 2 to reduce the stress on insulated wire core.

[0035] In optional embodiment, elastic flame-retardant wire core 2 includes skin layer and core layer, skin layer includes ceramic silicon rubber hollow tube, and core layer is flame-retardant structure arranged in ceramic silicon rubber hollow tube.

[0036] Since the ceramicized silicone rubber has good elasticity, and can form a coke shell when a fire occurs, the internal flame-retardant structure can further prevent the spread of fire.

[0037] In an optional embodiment, the cross-sectional area of the core layer is less than 1 / 9 of the cross-sectional area of the elastic flame-retardant core 2. In this way, the elastic flame-retardant core 2 can have sufficient elasticity to provide elastic support to the insulated core.

[0038] In an optional embodiment, the flame-retardant structure is provided as a paste-like flame-retardant structure. In this way, the flame-retardant structure can deform with the compression deformation of the elastic flame-retardant core 2, reducing the stress received by the cable when bent. The flame-retardant structure can be selected as a paste-like flame-retardant agent, which can cooperate with the flame-retardant rope to form a flame-retardant barrier outside the insulated cable, preventing the intrusion of external flames and preventing the internal conductor from catching fire.

[0039] In an optional embodiment, the fire barrier layer 5 is extruded on the outer wall of the cable core, the oxygen barrier and fireproof layer 6 is wrapped on the outer wall of the fire barrier layer 5, and the outer sheath 7 is wrapped on the outer wall of the oxygen barrier and fireproof layer 6.

[0040] Optionally, the fire barrier layer 5 includes a ceramicized silicone rubber fire barrier layer. The ceramicized silicone rubber fire barrier layer has good elasticity while having fire barrier performance, so that the overall fire-resistant cable maintains good bending performance.

[0041] Further, the oxygen barrier and fireproof layer 6 includes a corrugated copper sleeve formed by welding a longitudinal copper strip and then corrugating, which has good fire barrier capability and also prevents external oxygen and moisture from entering the cable.

[0042] In an optional embodiment, the outer sheath 7 includes an environmentally friendly polyurethane elastic sheath, which has excellent elasticity and wear resistance to meet the flexible use requirements.

[0043] In combination with the above embodiments, the fire-resistant cable of the utility model, the cable core is formed by twisting the insulated core, the elastic flame-retardant core and the flame-retardant rope together. When the cable is bent, the insulated core can extrude the elastic flame-retardant core to deform, thereby reducing the bending stress of the insulated core and the overall cable, which is beneficial to improve the durability of the cable. The elastic flame-retardant core is constructed as a hollow structure, and the internal flame-retardant structure cooperates with the flame-retardant rope to form a flame-retardant barrier outside the insulated core, effectively improving the overall flame-retardant capability of the cable.

[0044] Although the utility model has been disclosed as above with preferred embodiments, it is not intended to limit the utility model. Those skilled in the art without departing from the spirit and scope of the utility model can make various modifications and decorations. Therefore, the protection scope of the utility model shall be subject to the definition of the claims.

Claims

1. A ceramicized mineral-insulated, flame-retardant, flexible fire-resistant cable, characterized in that, include: Multiple insulated wire cores; Multiple elastic flame-retardant wire cores (2), together with multiple insulated wire cores and flame-retardant filler rope (3), are wrapped by wrapping tape (4) to form a cable core with a circular cross section; Fire-resistant layer (5) is extruded onto the outer wall of the cable core; An oxygen-barrier fire-resistant layer (6) covers the outer wall of the fire-resistant layer (5); The outer sheath (7) covers the outer wall of the oxygen-barrier fire-resistant layer (6); The elastic flame-retardant wire core (2) fills the gaps between the insulating wire cores, and each insulating wire core does not contact the others. The elastic flame-retardant wire core (2) includes a sheath and a core layer. The sheath includes a ceramicized silicone rubber hollow tube, and the core layer is a flame-retardant structure disposed inside the ceramicized silicone rubber hollow tube.

2. The ceramicized mineral-insulated flame-retardant flexible fire-resistant cable according to claim 1, characterized in that, The cross-sectional area of ​​the core layer is less than 1 / 9 of the cross-sectional area of ​​the elastic flame-retardant wire core (2).

3. The ceramicized mineral-insulated flame-retardant flexible fire-resistant cable according to claim 1, characterized in that, The flame-retardant structure is configured as a paste-like flame-retardant structure.

4. The ceramicized mineral-insulated flame-retardant flexible fire-resistant cable according to claim 1, characterized in that, The insulated core includes an oxygen-free copper conductor (11), a semi-conductive wrapping layer (12), an inorganic insulation layer (13), and a metallic shielding layer (14) distributed from the inside out.

5. The ceramicized mineral-insulated flame-retardant flexible fire-resistant cable according to claim 4, characterized in that, The oxygen-free copper conductor (11) includes multiple stranded oxygen-free copper wires, and the semi-conductive wrapping layer (12) includes a semi-conductive non-woven wrapping tape layer. The number of wrapping layers of the semi-conductive non-woven wrapping tape is one layer, and the wrapping overlap rate is greater than or equal to 15%.

6. The ceramicized mineral-insulated flame-retardant flexible fire-resistant cable according to claim 4, characterized in that, The metal shielding layer (14) includes a copper strip wrapping layer with a copper strip wrapping overlap rate of 20-30%.

7. The ceramicized mineral-insulated flame-retardant flexible fire-resistant cable according to claim 4, characterized in that, The inorganic insulating layer (13) comprises ceramicized halogen-free low-smoke flame-retardant polyolefin.

8. The ceramicized mineral-insulated flame-retardant flexible fire-resistant cable according to claim 1, characterized in that, The fire-retardant layer (5) includes a ceramicized silicone rubber fire-retardant layer.

9. The ceramicized mineral-insulated flame-retardant flexible fire-resistant cable according to claim 1, characterized in that, The oxygen-barrier refractory layer (6) includes a corrugated copper sleeve.

10. The ceramicized mineral-insulated flame-retardant flexible fire-resistant cable according to claim 1, characterized in that, The outer sheath (7) includes an environmentally friendly polyurethane elastic sheath.

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