CN217239121U

CN217239121U - Environment-friendly flexible mineral insulation fireproof cable

Info

Publication number: CN217239121U
Application number: CN202220449145.XU
Authority: CN
Inventors: 陈婉芳; 王登峰; 邵千俊; 王礼国; 丁志楠; 刘书鑫
Original assignee: Zhejiang Products Zhongda Cable Co ltd
Current assignee: Zhejiang Products Zhongda Cable Co ltd
Priority date: 2022-03-03
Filing date: 2022-03-03
Publication date: 2022-08-19
Anticipated expiration: 2032-03-03

Abstract

The utility model discloses a flexible mineral insulation fireproof cable of environment-friendly, strengthen the core strip around central stretch-proofing and twist jointly and constitute the cable core including four insulation core, insulation core includes the inner conductor, insulation fire prevention area is around covering and XLPE insulating layer, insulation fire prevention area is around the covering for the one-way spiral of insulation fire prevention area takes the lid around the package structure, the core strip is formed for aramid fiber bundle and stainless steel wire transposition to center stretch-proofing enhancement core, the cable core outside cladding low smoke type three-layer complex in proper order is around the covering, fire-resistant mica tape layer, double-deck polyethylene water blocking layer, ethylene propylene diene monomer inner sheath layer, the fine package of high temperature glass is around covering and ethylene propylene diene monomer outer sheath layer, cable core and the compound space intussuseption between the covering of low smoke type three-layer are filled with inorganic mineral heat dissipation filler. The cable has excellent fireproof performance, high water resistance, low smoke, zero halogen and flame retardancy, better flexibility and environmental protection.

Description

Environment-friendly flexible mineral insulation fireproof cable

Technical Field

The utility model relates to the technical field of cables, especially, relate to a flexible mineral insulation fireproof cable of environment-friendly.

Background

In power construction, a large number of cables are applied, for example, transmission and distribution lines laid indoors, in cable wells, bridges, pipes and cable tunnels are generally applied to fire-fighting and emergency systems with the rated voltage of 0.6/1kV or below at the alternating current of 50 Hz. The cable has the requirements of fire resistance, is easy to bend, has good cable insulation, and can supply power safely and reliably. However, common low-voltage cables on the market generally have fireproof performance, and under the great trend that products in the cable industry are developed towards high performance and high quality, the technical requirements of the low-voltage cables are higher and higher, and the low-voltage cables need to have excellent heat insulation, fireproof and water-blocking performances, so that powerful guarantee is provided for safe power supply, meanwhile, the low-voltage cables are green and environment-friendly, and the discarded cables can be recycled without polluting the natural environment.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to prior art not enough, the technical problem that solve provides a flexible mineral insulation fireproof cable of environment-friendly, and fire behavior is excellent, has high water proofness and low smoke and zero halogen fire behavior concurrently, and the pliability is better, is of value to the installation, green, non-staining natural environment.

The utility model discloses a make above-mentioned technical problem solve through following technical scheme.

An environment-friendly flexible mineral insulation fireproof cable comprises four insulation wire cores which are twisted together around a central tensile reinforcement core strip to form a cable core, wherein each insulation wire core comprises an inner conductor, an insulation fireproof belt winding layer and an XLPE insulation layer, the insulation fireproof belt winding layer is of an insulation fireproof belt one-way spiral lapping and wrapping structure, the insulation fireproof belt is of a three-layer bonding integrated structure of a crosslinked polyethylene resin inner layer, a mica belt core layer and a crosslinked polyethylene resin outer layer, the central tensile reinforcement core strip is formed by twisting aramid fiber bundles and stainless steel wires, the exterior of the cable core is sequentially wrapped with a low-smoke three-layer composite wrapping tape, a fire-resistant mica belt layer, a double-layer polyethylene water-blocking layer, an ethylene propylene diene monomer inner sheath layer, a high-temperature glass fiber wrapping layer and an ethylene propylene diene monomer outer sheath layer, and inorganic mineral heat dissipation filler is filled in a space between the cable core and the low-smoke three-layer composite wrapping tape, low-smoke type three-layer composite is around band from interior to exterior and is included polyester non-woven fabrics basic unit, nylon resin layer and aromatic polyimide isolation layer in proper order, the fine for inside and outside double-deck glass fiber high temperature line of high temperature glass is each other for reverse spiral winding to weave structure and spiral angle difference around the covering.

Preferably, the inner conductor is formed by stranding and pressing a plurality of tin-plated copper monofilaments to form a circular conductor structure.

Preferably, the lay length of the cable core is 10 to 20 times of the outer diameter of the insulated wire core.

Preferably, the aramid fiber bundles are formed by twisting a plurality of aramid fibers and integrally bonding the aramid fibers and thermoplastic polypropylene resin in a hot melting way.

Preferably, the thickness of the polyester non-woven fabric base layer is 0.05mm to 0.1mm, the thickness of the nylon resin layer is 0.1mm to 0.3mm, and the thickness of the aromatic polyimide isolation layer is 0.02mm to 0.05 mm.

Preferably, the diameter of the stainless steel wire is 0.02mm to 0.05 mm.

Preferably, the spiral angles of the inner and outer double-layer glass fiber high-temperature lines are both 35 degrees to 55 degrees, the wire diameter of the inner layer glass fiber high-temperature line is 0.15mm to 0.24mm, and the wire diameter of the outer layer glass fiber high-temperature line is 0.18mm to 0.32 mm.

Preferably, the outer surface of the ethylene propylene diene monomer inner sheath layer or/and the inner surface of the ethylene propylene diene monomer outer sheath layer are/is provided with a thermoplastic polypropylene bonding layer.

Preferably, the inorganic mineral heat dissipation filler is fire-proof mud.

Preferably, the total thickness of the ethylene propylene diene monomer inner sheath layer and the ethylene propylene diene monomer outer sheath layer is 1.6mm to 8 mm.

The utility model has the advantages that:

1. the cable is in accordance with the green and environment-friendly design of the cable, the material of the cable core meets the ROHS instruction of European Union, the cable is in accordance with the requirement of the environment-friendly cable, no harmful substances to human health are contained, inorganic mineral materials are adopted, the cable does not release smoke and toxic gas in the burning flame, the discarded cable can be completely recycled, no pollution is caused to the environment, and the cable is beneficial to environmental protection and renewable treatment. Adopt polyester non-woven fabrics basic unit, the nylon resin layer and the compound band of winding of low smoke type three-layer of the integrative structure of aromatic polyimide isolation layer three-layer, when the burning that catches fire of emergence cable, the nylon resin layer can be for polyester non-woven fabrics basic unit oxygen suppliment and promote the abundant burning of polyester non-woven fabrics basic unit, aromatic polyimide isolation layer has the effect of keeping apart the flue gas, effectively prevents the burning flue gas from scattering from the cable is inside, is of value to realizing the low smoke type fireproof cable that the performance is excellent.

2. At the inside insulating fire prevention area that adds of XLPE insulating layer and realize better fire prevention heat-proof effect around the covering, the cable core outside is through adopting fire-resistant mica tape layer, the fine fire-retardant characteristic of multilayer fire prevention of forming around covering and fire-retardant inner and outer sheath of high temperature glass, effectively prolongs heat-conduction to the inside time of cable, reduces the inside temperature of cable, ensures cable safety normal operating.

3. Adopt double-deck polyethylene water blocking layer, if the cable meets in the long-term soaking under aquatic or the apparent higher operating mode condition of humidity, the water blocking layer can effectually prevent moisture invasion inside, protects the insulating electrical characteristics of cable, increase of service life.

4. The central tensile-resistant reinforced core strip is a core structure formed by twisting aramid fiber bundles and stainless steel wires, has high tensile strength and excellent tensile resistance, can unload force to a certain extent to load stress applied to the cable core from the outside in the aspect of lateral pressure resistance, slows down the impact of an external heavy object, reduces the local stress concentration of the cable core, improves the integral flexibility of the cable core, and is easier to lay and install.

5. Set up the fine covering of high temperature glass between the inside and outside restrictive coating of EPT rubber, glass fiber high temperature line is green reinforced material, and tensile strength is big, uses as the reinforcement of inside and outside restrictive coating, and elastic modulus is very big, improves the pliability and the bending resistance of cable, prevents effectively that the cable from taking place the distortion after the atress, helps keeping the cable core structure balanced, improves the stability of cable electrical characteristic, increases life.

Drawings

Fig. 1 is a schematic sectional structure diagram of an embodiment of the present invention.

In the figure: 1-an insulating wire core, 2-a central stretch-resistant reinforced core strip, 3-a low-smoke three-layer composite wrapping tape, 4-a fire-resistant mica tape layer, 5-a double-layer polyethylene water-blocking layer, 6-an ethylene propylene diene monomer inner sheath layer, 7-a high-temperature glass fiber wrapping layer, 8-an ethylene propylene diene monomer outer sheath layer, 9-inorganic mineral heat-dissipation filler, 10-an inner conductor, 11-an insulating fire-proof tape wrapping layer and 12-an XLPE insulating layer.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

As shown in fig. 1, the utility model discloses flexible mineral insulation fireproof cable of environment-friendly, including four insulation core 1 around central tensile reinforce core strip 2 transposition constitution cable core jointly, the cable core lay length does 10 to 20 times of 1 external diameter of insulation core. The insulated wire core 1 comprises an inner conductor 10, an insulated fireproof tape winding covering layer 11 and an XLPE insulating layer 12, and specifically, the inner conductor 10 is a round conductor structure formed by twisting and pressing a plurality of tinned copper single wires. The insulating fireproof belt winding layer 11 is of an insulating fireproof belt one-way spiral lapping and covering winding structure, and the insulating fireproof belt is of a three-layer bonding integrated structure consisting of a crosslinked polyethylene resin inner layer, a mica belt core layer and a crosslinked polyethylene resin outer layer. The central stretch-proofing reinforced core strip 2 is formed by twisting aramid fiber bundles and stainless steel wires, specifically, the aramid fiber bundles are formed by twisting a plurality of aramid fibers and are integrally bonded with thermoplastic polypropylene resin in a hot melting mode, and the wire diameter of the stainless steel wires is 0.02 mm-0.05 mm.

The cable core is coated with a low-smoke three-layer composite wrapping tape 3, a fire-resistant mica tape layer 4, a double-layer polyethylene water-blocking layer 5, an ethylene propylene diene monomer inner sheath layer 6, a high-temperature glass fiber wrapping layer 7 and an ethylene propylene diene monomer outer sheath layer 8 in sequence, and further, a thermoplastic polypropylene bonding layer is arranged on the outer surface of the ethylene propylene diene monomer inner sheath layer 6 or/and the inner surface of the ethylene propylene diene monomer outer sheath layer 8. And inorganic mineral heat dissipation filler 9 such as fireproof mud is filled in a space between the cable core and the low-smoke three-layer composite wrapping tape 3. Low smoke type three-layer complex includes polyester non-woven fabrics basic unit, nylon resin layer and aromatic polyimide isolation layer around band 3 from interior to exterior in proper order, and is further, polyester non-woven fabrics basic unit thickness is 0.05mm to 0.1mm, the nylon resin layer thickness is 0.1mm to 0.3mm, aromatic polyimide isolation layer thickness is 0.02mm to 0.05 mm. The fine winding layer 7 of high temperature glass is that inside and outside double-deck glass fiber high temperature line is mutual for reverse spiral winding to weave structure and spiral angle different, and is further, the spiral angle of inside and outside double-deck glass fiber high temperature line is 35 degrees to 55 degrees, the line footpath of inlayer glass fiber high temperature line is 0.15mm to 0.24mm, the line footpath of outer glass fiber high temperature line is 0.18mm to 0.32 mm. The total thickness of the ethylene propylene diene monomer inner sheath layer 6 and the ethylene propylene diene monomer outer sheath layer 8 is 1.6mm to 8 mm.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. Flexible mineral insulation fireproof cable of environment-friendly, characterized by: the cable comprises four insulation wire cores (1) which are twisted together around a central stretch-resistant reinforced core strip (2) to form a cable core, wherein each insulation wire core (1) comprises an inner conductor (10), an insulation fire-proof belt winding layer (11) and an XLPE (cross linked polyethylene) insulation layer (12), the insulation fire-proof belt winding layer (11) is of an insulation fire-proof belt unidirectional spiral covering and wrapping structure, the insulation fire-proof belt is of a three-layer bonding integrated structure of a cross-linked polyethylene resin inner layer, a mica belt core layer and a cross-linked polyethylene resin outer layer, the central stretch-resistant reinforced core strip (2) is formed by twisting an aramid fiber bundle and a stainless steel wire, the cable core is externally wrapped with a low-smoke three-layer composite wrapping belt (3), a fire-resistant mica belt layer (4), a double-layer polyethylene water-blocking layer (5), an ethylene propylene diene monomer inner sheath layer (6), a high-temperature wrapping layer (7) and an ethylene propylene diene monomer outer sheath layer (8) in sequence, the cable core with the space intussuseption between low smoke type three-layer complex is packed with inorganic mineral heat dissipation filler (9) around band (3), low smoke type three-layer complex includes polyester non-woven fabrics basic unit, nylon resin layer and aromatic polyimide isolation layer from interior to exterior in proper order around band (3), the fine double-deck glass fiber high temperature line each other is reverse spiral winding to weave structure and helix angle difference for inside and outside the fine winding layer (7) of high temperature.

2. The environment-friendly flexible mineral-insulated fireproof cable according to claim 1, wherein: the inner conductor (10) is a round conductor structure formed by twisting and pressing a plurality of tinned copper single wires.

3. The environment-friendly flexible mineral-insulated fireproof cable according to claim 1, wherein: the cable core lay length is 10 to 20 times of the outer diameter of the insulated wire core (1).

4. The environment-friendly flexible mineral-insulated fireproof cable according to claim 1, wherein: the aramid fiber bundles are formed by twisting a plurality of aramid fibers and bonding the aramid fibers and thermoplastic polypropylene resin into a whole in a hot melting way.

5. The environment-friendly flexible mineral-insulated fireproof cable according to claim 1, wherein: the thickness of the polyester non-woven fabric base layer is 0.05mm to 0.1mm, the thickness of the nylon resin layer is 0.1mm to 0.3mm, and the thickness of the aromatic polyimide isolation layer is 0.02mm to 0.05 mm.

6. The environment-friendly flexible mineral-insulated fireproof cable according to claim 1, wherein: the diameter of the stainless steel wire is 0.02mm to 0.05 mm.

7. The environment-friendly flexible mineral-insulated fireproof cable according to claim 1, wherein: the spiral angle of the inner and outer double-layer glass fiber high-temperature wires is 35-55 degrees, the wire diameter of the inner layer glass fiber high-temperature wire is 0.15-0.24 mm, and the wire diameter of the outer layer glass fiber high-temperature wire is 0.18-0.32 mm.

8. The environment-friendly flexible mineral-insulated fireproof cable according to claim 1, wherein: and a thermoplastic polypropylene bonding layer is arranged on the outer surface of the ethylene propylene diene monomer inner sheath layer (6) or/and the inner surface of the ethylene propylene diene monomer outer sheath layer (8).

9. The environment-friendly flexible mineral-insulated fireproof cable according to claim 1, wherein: the inorganic mineral heat dissipation filler (9) is fireproof mud.

10. The environment-friendly flexible mineral-insulated fireproof cable according to claim 1, wherein: the total thickness of the ethylene propylene diene monomer inner sheath layer (6) and the ethylene propylene diene monomer outer sheath layer (8) is 1.6mm to 8 mm.