CN205302999U - Metal sheath inorganic mineral insulation flexible fireproof cable - Google Patents

Abstract

The utility model relates to a metal sheath inorganic mineral insulated flexible fireproof cable, which comprises three wire cores, a heat insulation layer and an outer sheath. Three wire cores are twisted into a cable core, the heat insulation layer is covered outside the cable core, the outside of the heat insulation layer is covered with an outer sheath, and the gap between the wire core and the heat insulation layer and the gap between the wire cores are filled. layer. The fiber core is composed of a conductor, an isolation layer and an insulation layer. The isolation layer overlaps and wraps around the outside of the conductor, and the insulation layer wraps around the outside of the isolation layer. The conductor is annealed copper wire, the isolation layer is a high-temperature-resistant polyester tape, and the filling layer is a flame-retardant glass fiber strip. The insulating layer is divided into an inner insulating layer and an outer insulating layer. The inner insulating layer is a three-layer refractory synthetic mica tape, and the outer insulating layer is a three-layer ceramic silicon rubber tape. The heat insulation layer is a layer of refractory synthetic mica tape and three layers of ceramic silicon rubber tape, and the outer sheath is a continuously corrugated nickel-copper alloy tape. The utility model improves the high temperature resistance and fireproof performance of the cable, is beneficial to reducing the loss of people's life and property, and improves the use safety of the cable.

Description

A metal sheath inorganic mineral insulated flexible fireproof cable

technical field

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

Background technique

With the wide application of wires and cables in power systems, high-rise buildings, industrial and mining enterprises, urban and rural power distribution and communication networks, fire accidents caused by wires and cables also occur from time to time. According to statistics, fires caused by wires and cables account for more than 60% of the total electrical fires, and fires caused by wires and cables have the characteristics of rapid fire, rapid fire, and easy spread and expansion. Fireworks are poisonous, difficult to fight, and accompanied by secondary dangers, endangering people's lives and property. The damage caused by the fire is serious and the recovery will take a long time. Therefore, controlling and reducing the occurrence of wire and cable fires has become a major issue in ensuring social public safety.

Ordinary wires are composed of conductors and insulating layers. Low-voltage overhead conductors are also divided into two types: bare wires and insulated wires. There is no insulating protective layer outside the bare wires, and the insulated wires have an insulating protective layer. The material of the protective layer is different and divided into rubber insulated wire and plastic insulated wire, and neither the leather insulated wire nor the plastic insulated wire has fire resistance. The insulation materials of ordinary cables and wires are all organic polymer materials, which are easy to carbonize under flame conditions and lose their insulating effect. Fireproof cables are the key equipment of firefighting systems. How to perform normal power transmission functions under flame conditions is a difficult problem for fireproof cables.

Utility model content

The purpose of the utility model is to provide a metal sheath inorganic mineral insulated flexible fireproof cable to improve the high temperature resistance and fireproof performance of the cable, reduce the loss of people's life and property, and improve the safety of the cable.

The technical solution of the utility model is: a metal sheath inorganic mineral insulated flexible fireproof cable, including three wire cores, a heat insulation layer and an outer sheath. Three wire cores are twisted into a cable core, the heat insulation layer is covered outside the cable core, the outside of the heat insulation layer is covered with an outer sheath, and the gap between the wire core and the heat insulation layer and the gap between the wire cores are filled. layer. The fiber core is composed of a conductor, an isolation layer and an insulation layer. The isolation layer overlaps and wraps around the outside of the conductor, and the insulation layer wraps around the outside of the isolation layer. The conductor is annealed copper wire, the isolation layer is a high-temperature-resistant polyester tape, and the filling layer is a flame-retardant glass fiber strip. The insulating layer is divided into an inner insulating layer and an outer insulating layer. The inner insulating layer is a three-layer refractory synthetic mica tape, and the outer insulating layer is a three-layer ceramic silicon rubber tape. The heat insulation layer is a layer of refractory synthetic mica tape and three layers of ceramic silicon rubber tape, and the outer sheath is a continuously corrugated nickel-copper alloy tape.

The thickness of high temperature resistant polyester tape is 0.02mm, the thickness of refractory synthetic mica tape is 0.14mm, the thickness of vitrified silicon rubber tape is 0.2mm, and the thickness of nickel copper alloy tape is 0.7mm. The conductor is made of a plurality of annealed copper wires tightly pressed and twisted by a high-strength twisting machine.

The insulation layer of the cable of the utility model is composed of mica tape and ceramic silicon rubber tape. The synthetic mica tape has the characteristics of small expansion coefficient, high dielectric strength, high resistivity and uniform dielectric constant, and also has special heat resistance. High-grade characteristics, can reach the A-class fire resistance level of 950-1000 ℃. The ceramicized silicone rubber tape has excellent electrical insulation, which can reach the electrical properties of XLPE and EPDM, and the volume resistivity can reach 2×10 ¹⁵ Ω·cm. It will be rapidly ceramicized in a fire environment of 350°C, effectively insulating heat transmission Protect the wire core safety. The two insulating materials are non-toxic, smokeless, safe and environmentally friendly when burned. It can adapt to low temperature and high temperature environment, and the service life of the cable can reach more than 70 years. The cable core is wrapped with mica tape and ceramic silicon rubber tape as a heat insulation layer. When a fire occurs, the ceramic silicon rubber tape will be rapidly porcelainized to form a shell at a high temperature of 350°C, effectively isolating the conduction of heat source to the cable core. Ensure the normal power supply function of the cable.

The metal-sheathed inorganic mineral insulated flexible fireproof cable of the utility model improves the high temperature resistance and fireproof performance of the cable, is beneficial to reducing the loss of people's life and property, and improves the use safety of the cable. The utility model has a wide range of applications and has the advantages of light weight, high flexibility, small bending radius, corrosion resistance, no electromagnetic interference, large carrying capacity, strong overload capacity, environmental protection, smoke-free and non-toxic, and long service life. There is no adverse effect on people and the environment during the manufacturing and application of the product, which meets the requirements of energy saving and environmental protection.

Description of drawings

Fig. 1 is a schematic cross-sectional view of a metal sheathed inorganic mineral insulated flexible fireproof cable of the present invention;

in:

1—conductor, 2—isolating layer, 3—insulating layer, 4—filling, 5—insulating layer, 6—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 metal sheath inorganic mineral insulated flexible fireproof cable, as shown in FIG. 1 , includes three wire cores, a heat insulating layer 5 and an outer sheath 6 . Three wire cores are twisted into a cable core, and the heat insulation layer is covered outside the cable core. The heat insulation layer is a layer of refractory synthetic mica tape and three layers of ceramic silicone rubber tape. The exterior of the heat insulation layer is covered with an outer sheath, and the outer sheath is a continuously corrugated nickel-copper alloy strip. The gap between the wire core and the heat insulation layer and the gap between the wire cores are provided with a filling layer 4, and the filling layer is a flame-retardant glass fiber strip. The fiber core is composed of a conductor 1 , an isolation layer 2 and an insulating layer 3 . The conductor is made of a plurality of annealed copper wires tightly pressed and twisted by a high-strength twisting machine. The isolation layer is overlapped and wrapped on the outside of the conductor, and the isolation layer is a high temperature resistant polyester tape. The insulating layer is covered on the outside of the insulating layer. The insulating layer is divided into an inner insulating layer and an outer insulating layer. The inner insulating layer is a three-layer refractory synthetic mica tape, and the outer insulating layer is a three-layer ceramic silicone rubber tape. The thickness of high temperature resistant polyester tape is 0.02mm, the thickness of refractory synthetic mica tape is 0.14mm, the thickness of vitrified silicon rubber tape is 0.2mm, and the thickness of nickel copper alloy tape is 0.7mm.

Overlap and wrap a layer of high-temperature polyester tape on the tightly pressed round copper conductor as an isolation layer, then wrap three layers of refractory synthetic mica tape, and wrap three layers of ceramic silicon rubber tape on the wire core after wrapping the mica tape Form an insulated core, three insulated cores are twisted into a cable core, the gap between the insulated cores is filled with glass fiber strips, and the cable core is wrapped with a layer of refractory synthetic mica tape and three layers of ceramic silicone rubber tape for heat insulation layer, and finally the continuous corrugated nickel-copper alloy material is used as the outer sheath of the cable. The isolation layer is made of high temperature resistant PET polyester tape material, which is resistant to high temperature and has good insulation performance. The insulation is made of a combination of refractory synthetic mica tape and vitrified silicone rubber tape. The metal outer sheath of the cable is made of a nickel-copper alloy strip on the heat insulation layer, which is continuously welded, and then embossed to form the outer metal sheath of the cable.

The corrugated nickel-copper alloy outer sheath has excellent bending performance and excellent self-supporting performance, and the bending radius can reach 6D-10D, which can reduce and avoid cable bridges and pipe penetration. Copper alloy has a high melting point (1380°C) and good electrical conductivity, so it can be used as a protective grounding wire for cables. The utility model has good sealing performance, corrosion resistance, wear resistance, high temperature softening resistance, water resistance and moisture resistance performance, and is beneficial to prolong the service life of the cable.

Claims (2)

1. A metal-sheathed inorganic mineral insulated flexible fireproof cable, including three wire cores, a heat insulation layer (5) and an outer sheath (6), the three wire cores are twisted into a cable core, and the heat insulation layer is covered on the cable In addition to the core, the outer sheath of the heat insulation layer is covered; the gap between the core and the heat insulation layer and the gap between the cores are provided with a filling layer (4), which is characterized in that: the core It is composed of a conductor (1), an isolation layer (2) and an insulation layer (3). The isolation layer is overlapped and wrapped around the outside of the conductor, and the insulation layer is wrapped around the outside of the isolation layer; the conductor is an annealed copper wire , the insulating layer is a high-temperature-resistant polyester tape, the filling layer is a flame-retardant glass fiber strip; the insulating layer is divided into an inner insulating layer and an outer insulating layer, and the inner insulating layer is a three-layer fire-resistant synthetic mica tape, The outer insulating layer is a three-layer ceramic silicon rubber belt; the heat insulation layer is a layer of refractory synthetic mica belt and three layers of ceramic silicon rubber belt, and the outer sheath is a continuous embossed nickel-copper alloy belt. 2. According to claim 1, the metal-sheathed inorganic mineral insulated flexible fireproof cable is characterized in that: the thickness of the high temperature-resistant polyester tape is 0.02-0.025mm, the thickness of the fire-resistant synthetic mica tape is 0.14mm, and the ceramic The thickness of the silicone rubber strip is 0.2mm, and the thickness of the nickel-copper alloy strip is 0.7mm.