CN205282159U - Flexible fireproof cable of isolated form mineral insulation - Google Patents

Abstract

The utility model relates to an isolated mineral insulated flexible fireproof cable, comprising a wire core, a fireproof layer, a tape layer and an outer sheath, the wire cores are twisted into a cable core, the cable core is wrapped with a tape layer outside, and the outer sheath is covered on the outside of the tape layer. The gap between the wire cores, the gap between the wire core and the tape layer is filled with a fireproof layer. The wire core includes a conductor, an insulating layer, an isolation layer and a color separation layer. The insulation layer is extruded on the outside of the conductor, the isolation layer is extruded on the outside of the insulation layer, and the color separation layer is extruded on the outside of the isolation layer. The utility model has good fire prevention and bending performance, improves the insulation performance and fire resistance performance of the cable, improves the safety of power transmission and use, adapts to various fire situations, and can be installed and used in environments with complex structures and narrow spaces.

Description

An isolated mineral insulated flexible fireproof cable

technical field

The utility model belongs to the technical field of electric equipment and equipment, relates to a cable, in particular to an isolated mineral insulated flexible fireproof cable.

Background technique

In electrical fires, the fires caused by cable aging and overload use account for a large proportion. At the same time, the toxic gas emitted by igniting the cables will cause a large number of casualties and hinder firefighters from extinguishing the fire. The important main lines of civil buildings and cables for fire protection are ordinary fire-resistant cables (NH-VV, NH-YJV) and low-smoke halogen-free fire-resistant cables (WDNH-YJV). Other lines use flame-retardant cables (ZR-VV, CR-YJV). As we all know, the fire scene is very complicated. The emergency fire protection power supply line needs to withstand the high temperature of 800 ℃ ~ 1000 ℃, as well as the splashing of water or other liquids and the impact of falling building materials from high places. The power supply capability is strictly required. Traditional fire-resistant cables cannot fully meet the above requirements. The national standard GB/Tl2666-6 fire-resistant cable test standard stipulates that the temperature should be kept at 950°C for 90 minutes, which cannot withstand the impact of spraying water and falling heavy objects. In order to withstand the impact of spraying water and falling heavy objects, it is necessary to wear metal pipes or sealed bridges for protection, which increases the installation auxiliary cost and installation space.

Utility model content

The purpose of this utility model is to provide an isolated mineral insulated flexible fireproof cable to improve the insulation performance and fireproof performance of the cable, improve the safety of power transmission and use, and be suitable for use in various fire situations.

The technical scheme of the utility model is: an isolated mineral insulated flexible fireproof cable, including a wire core, a fireproof layer, a tape layer and an outer sheath; Coated on the outside of the tape layer. The gap between the wire cores, the gap between the wire core and the tape layer is filled with a fireproof layer. The wire core includes a conductor, an insulating layer, an isolation layer and a color separation layer, the insulation layer is extruded outside the conductor, the isolation layer is extruded outside the insulation layer, and the color separation layer is extruded outside the isolation layer.

The conductor is annealed copper wire or aluminum wire, the insulating layer is ceramicized fireproof and refractory silicone rubber as the insulating layer, the isolation layer is a soft aluminum material isolation layer, the color separation layer is a cross-linked polyethylene material color separation layer, and the fire protection layer is a flexible non-woven fabric. Halogen low-smoke, phosphorus-nitrogen-free, flame-retardant, and room-temperature curing ceramic refractory mineral oxygen-insulating filling mud fireproof layer, and the outer sheath is low-smoke, halogen-free, flame-retardant polyethylene hydrocarbon outer sheath. The thickness of the insulating layer is 1.4mm, and the thickness of the isolation layer is 1.2mm. Fireproof cables have 3 to 10 wire cores.

Extrude a layer of ceramic fireproof and refractory silicone rubber insulation layer on the tightly pressed circular annealed copper wire conductor, extrude a layer of soft aluminum metal isolation layer on the insulation core, and extrude a layer of cross-linked polymer on the isolation layer. Vinyl material is used as the color separation layer, and the cross-linked polyethylene insulation layer is made of red, yellow, green, blue, black or yellow-green masterbatch as the distinguishing mark of the cable collar. The gap between the wire cores after stranded cable cores is densely extruded, flexible, low-smoke, non-halogen, phosphorus-nitrogen, flame-retardant, room-temperature-cured ceramic refractory mineral oxygen-isolated filling mud is used as a fireproof layer, and the cable core is wrapped with a layer of glass. The fiber tape is tied tightly, and a layer of low-smoke, halogen-free, flame-retardant polyethylene material is extruded outside the glass fiber tape as the outer sheath of the cable.

The utility model isolated mineral insulated flexible fireproof cable has good fireproof and bending performance, improves the insulation performance and fireproof performance of the cable, improves the safety of power transmission and power consumption, is suitable for use in various fire situations, and can be used in complex structures and good spaces. Install and use in narrow environment. The utility model has a wide range of applications, and has the characteristics of high flexibility, fire resistance, large carrying capacity, impact voltage resistance, high temperature resistance, overload resistance, mechanical damage resistance, halogen-free and non-toxic, explosion-proof, waterproof, unlimited production length and specifications, etc. And there is no harm to people and the environment in the process of manufacturing and application.

Description of drawings

Fig. 1 is a schematic cross-sectional view of the utility model isolated mineral insulated flexible fireproof cable;

in

1—conductor, 2—insulation layer, 3—isolation layer, 4—color separation layer, 5—fire protection layer, 6—tape layer, 7—outer sheath.

detailed description

The utility model is described in detail below in conjunction with embodiment and accompanying drawing. The protection scope of the present utility model is not limited to the embodiments, and any changes made by those skilled in the art within the scope of the claims also belong to the protection scope of the present utility model.

The utility model isolated mineral insulated flexible fireproof cable, as shown in Figure 1, includes three wire cores, a fireproof layer 5, a tape layer 6 and an outer sheath 7. Three wire cores are twisted into a cable core, the outside of the cable core is wrapped with a tape layer, and the outer sheath is wrapped around the outside of the tape layer. The gap between the wire cores and the gap between the wire core and the wrapping layer are filled with the fireproof layer 5 . The wire core includes a conductor 1, an insulating layer 2, an isolation layer 3 and a color separation layer 4. The insulation layer is extruded on the outside of the conductor, the isolation layer is extruded on the outside of the insulation layer, and the color separation layer is extruded on the outside of the isolation layer. The conductor 1 is an annealed copper wire, and a plurality of annealed copper wires are tightly compressed and stranded by a high-strength stranding machine. The insulating layer is made of vitrified fireproof and refractory silicone rubber, with a thickness of 1.4mm. The isolation layer is a soft aluminum isolation layer with a thickness of 1.2mm. The color separation layer is a cross-linked polyethylene material color separation layer, and the fireproof layer is a flexible, low-smoke, non-halogen, phosphorus-nitrogen, flame-retardant, room temperature-cured ceramic refractory mineral oxygen-insulated filling mud fireproof layer, and the tape layer is a glass fiber tape. The sheath is a low-smoke halogen-free flame-retardant polyethylene hydrocarbon outer sheath.

The conductor is made of annealed copper wire and twisted by high-strength circular compression, and a layer of ceramic fireproof and refractory silicone rubber is extruded outside the high-strength circular compression-stranded conductor as an insulating layer, and a layer of insulating layer is extruded on the body insulation layer The soft aluminum metal material is used as the isolation layer, and a layer of polyethylene material is extruded on the isolation layer as the color separation layer. Wrap a layer of glass fiber tape for fastening, and then extrude a layer of low-smoke, halogen-free, flame-retardant polyethylene hydrocarbon material outside the glass fiber tape as the outer sheath of the cable.

The cable of the utility model uses ceramicized fire-proof and refractory silicone rubber as the insulating layer. The ceramicized refractory silicone rubber is a functional material added to high-temperature heat-vulcanized silicone rubber. Non-absorbent, high and low temperature resistance, ozone aging resistance and weathering resistance are the basic characteristics of silicone rubber, and have excellent electrical insulation and processing properties. Under high-temperature flame ablation, the functional material silicone rubber composite mixture forms a hard ceramic armored protective layer, which plays the role of isolating flames, fire prevention, insulation, heat insulation, water insulation and earthquake resistance, and ensures the protection against fire in case of fire. Unimpeded power and communication. The isolation layer outside the cable insulation layer is made of soft aluminum, which not only plays the role of temperature insulation, heat insulation, fire and water protection, but also prevents objects in the fire environment from impacting and damaging the cable insulation layer. The color-separation layer of the cable is made of cross-linked polyethylene material with stable performance, which has the function of isolating moisture and oxygen immersion, and can also be used as a color-separation mark for the cable collar, which is convenient for installation and construction.

The cable core is densely extruded, flexible, halogen-free, low-smoke, phosphorus-nitrogen, flame-retardant, and cured at room temperature. Ceramic refractory mineral oxygen-insulating filling mud is used as a fireproof layer. After burning, a purely inorganic hard ceramic support body is formed, and the inside is a hard honeycomb. Shaped shell has good insulation, temperature insulation, heat insulation, fire and water blocking effects, and can withstand high temperatures of 2000°C. The hard ceramic armored shell has passed the test of GB/T12666-6 standard 950～1100℃×90min and above. It has good elasticity and flexibility, reduces the bending radius, and does not crack during production and laying.

Claims (4)

1. An isolated mineral insulated flexible fireproof cable, including a core, a fireproof layer (5), a tape layer (6) and an outer sheath (7), the cores are twisted into a cable core, and the core is wrapped around the outside The tape layer, the outer sheath is wrapped on the outside of the tape layer; the gap between the wire cores, and the gap between the wire core and the tape layer are filled with a fireproof layer (5), which is characterized in that: the wire core includes a conductor (1), insulation layer (2), isolation layer (3) and color separation layer (4), the insulation layer is extruded on the outside of the conductor, the isolation layer is extruded on the outside of the insulation layer, and the color separation layer The layer is extruded on the outside of the isolation layer. 2. The isolated mineral insulated flexible fireproof cable according to claim 1, characterized in that: the conductor (1) is annealed copper wire or aluminum wire, and the insulating layer (2) is ceramicized fireproof and refractory silicone rubber insulation layer, the isolation layer (3) is an isolation layer of soft aluminum material, the color separation layer (4) is a color separation layer of cross-linked polyethylene material, and the fireproof layer is a flexible, halogen-free, low-smoke, phosphorus-nitrogen, and flame-retardant The fire-proof layer of ceramic refractory mineral oxygen-insulating filling mud cured at room temperature, the tape layer (6) is a glass fiber tape, and the outer sheath (7) is a low-smoke, halogen-free, flame-retardant polyethylene hydrocarbon outer sheath. 3. The isolated mineral insulated flexible fireproof cable according to claim 2, characterized in that: the thickness of the insulating layer is 1.4mm, and the thickness of the insulating layer is 1.2mm. 4. The isolated mineral insulated flexible fireproof cable according to claim 1, characterized in that: there are 3 to 10 wire cores.