CN204463907U - fireproof cable - Google Patents

Abstract

The utility model discloses a kind of fireproof cable, comprise conductor, insulating barrier, laying, the restrictive coating arranged from inside to outside, described insulating barrier is the composite insulation layer be made up of inorganic mineral insulation band lapping layer and the fire-resistant composite band lapping layer of ceramic, has good heat-insulating, fire-preventing performance and overload capacity; Between insulating barrier and laying, be also provided with thermistor wire, this thermistor wire is through cable longitudinally, be connected with external monitoring warning device, send real-time early warning signal, can avoid causing from source property fire, when exogenous fire, can not be combustion-supporting, can work on.

Description

fireproof cable

technical field

The utility model relates to cables, in particular to a fireproof cable.

Background technique

With the acceleration of industrialization and urbanization, various types of fire accidents also occur frequently, causing huge losses of life and property. Among them, many fires are caused by cable overload.

With the improvement of fire protection awareness, developed countries have stipulated that the distribution lines of some electrical equipment must use fire-resistant cables, and domestic power departments are also promoting the use of fire-resistant cables in urban high-rise buildings and entertainment venues.

Fireproof cables should meet two requirements, one is to avoid self-fire, that is, the cable itself will not cause fire, and the other is that in the outer edge of fire, the cable does not burn or support combustion, and can continue to work.

Existing ordinary fire-resistant cables generally use polyvinyl chloride or cross-linked polyethylene as insulation materials. Only flame retardants and smoke suppressants are added to the insulation materials. The fire-resistant temperature is low and fires are still prone to fire. Keep working to buy more time for escape and rescue.

At the beginning of a fire, the fire is usually very small, but because the cables are usually hidden, it is difficult to be detected, and it is easy to miss the opportunity to extinguish the fire.

Contents of the invention

The purpose of the utility model is to overcome the disadvantages of the existing fireproof cables and provide a cable with good insulation strength and high heat resistance temperature, which can provide fire warning and can continue to work after a fire occurs.

For realizing above-mentioned object, the technical scheme that the utility model adopts is:

A fireproof cable, including a conductor arranged from inside to outside, an insulating layer, a liner layer, and a sheath layer, characterized in that the insulating layer is made of inorganic mineral insulating tape around the cladding and ceramic refractory composite tape around the cladding Composite insulation layer; between the insulation layer and the liner layer, a thermistor wire is also provided, and the thermistor wire runs through the cable longitudinally.

The conductor is formed by twisting multiple strands of thin copper wires.

The inorganic mineral insulating tape is one of mica tape, asbestos tape and glass fiber tape.

There are multiple thermistor wires, which are evenly distributed on the surface of the insulating layer along the circumferential direction of the insulating layer.

The sheath layer is a corrugated copper tape sheath layer.

Another kind of scheme of the present utility model is:

A fireproof cable, the cable is a multi-core cable with at least two insulated wire cores, characterized in that the insulated wire cores are composed of a conductor and an insulating layer coated on the conductor, and the conductor is made of multiple strands of fine copper The insulation layer is a composite insulation layer composed of inorganic mineral insulating tape around the cladding and ceramic refractory composite tape around the cladding; all insulated cores are twisted together to form a cable core, and between the insulated cores The voids are filled with inorganic fibers, the inorganic fibers are preferably glass fibers; there is a liner layer on the periphery of the cable core, and the liner layer is a ceramic refractory composite tape wrapping layer; Sensitive resistance wires, the thermistor resistance wires run through the cable longitudinally, the number of thermistor resistance wires are uniformly distributed on the surface of the cable core along the circumferential direction of the cable core; there is a sheath layer of corrugated copper tape on the periphery of the liner layer.

The beneficial effects of the utility model:

Since the cable does not use any organic material, it is impossible to burn, and there is a thermistor wire in the cable, which is connected with an external monitoring and alarm device, and can send a real-time warning signal. When the temperature rise of the cable is too high, cut off the power supply, and the It will ignite the organic substances near the cable, which completely avoids the spontaneous fire; in the exogenous fire, the cable does not spontaneously ignite or support combustion, which can reduce the fire and smoke and reduce personal injury.

Since the insulating layer is wrapped with inorganic mineral insulating tape (one of mica tape, asbestos tape, and glass fiber tape) and ceramic refractory composite tape, it has excellent insulation and high temperature resistance, and a hard layer is formed on the surface of the ceramic refractory composite tape. The ceramic layer can ensure that the insulation will not be broken down when the cable is overloaded and the temperature rise is too high. On the one hand, it makes the cable have a strong overload capacity; The cable can still be energized to buy enough time for escape and rescue. On the other hand, during the cable manufacturing and laying process, it can prevent mica and asbestos from powdering and falling off, protect the insulation layer, and enhance the process feasibility.

The metal sheath layer can play the role of waterproof, moisture-proof, anti-corrosion, and anti-collision by external force, and can also be used as a ground wire at the same time.

Description of drawings

Figure 1 is a schematic diagram of the cable single-core structure of the utility model.

Figure 2 is a schematic diagram of the cable multi-core structure of the present invention.

Resistance wire; 5-inorganic fiber filling; 6-corrugated copper tape sheath layer.

Detailed ways

In order to further explain the technical solution of the utility model, the following will be described in detail in conjunction with the accompanying drawings and embodiments.

Embodiment one :

As shown in Figure 1, the cable is a single-core cable. In this example, there are 4 insulated wire cores, and a copper conductor 1 is arranged from the inside to the outside. The copper conductor 1 is twisted by multiple thin copper wires. The conductor 1 is flat and densely wrapped with an inorganic mineral insulating tape, the inorganic mineral insulating tape may be mica tape, asbestos tape, or glass fiber tape; then it is wrapped with ceramic refractory composite tape to form a composite insulating layer 2 . Thermistor wires 4 are arranged on the composite insulating layer, and the thermistor wires 4 are four in this example, and are evenly distributed along the circumferential direction of the composite insulating layer, and the thermistor wires 4 are used to connect external monitoring and alarm devices, When a fire occurs, due to heat, the resistance of the thermistor wire 4 changes, an early warning signal is issued, the power supply is cut off in time, and a spontaneous fire is avoided. On the periphery of the thermistor wire, wrap a layer of ceramic refractory tape to form a liner layer 3; on the periphery of the liner layer 3, there is a corrugated copper tape sheath layer 6, and the metal sheath layer 6 is waterproof, moisture-proof and anti-corrosion , Anti-mechanical impact, and can also be used as a ground wire.

The manufacturing steps of this cable:

⑴. Twisting the fine copper wire into a conductor, the material, diameter and number of strands of the fine copper wire are configured according to the design requirements;

(2) Wrap inorganic mineral insulating tape on the conductor, and then wrap ceramic refractory composite tape to form an insulating layer;

⑶. Arrange the thermistor wires on the insulation layer. The specification and quantity of thermistor wires should be configured according to the design requirements. If there are multiple wires, they should be evenly distributed along the circumference of the insulation layer;

⑷, Wrap ceramic refractory composite belt to form a liner layer;

(5) Longitudinal clad copper strip, welded by argon arc welding, and a metal sheath layer is formed by special wrinkle rolling equipment.

Embodiment two:

As shown in Figure 2, the cable is a multi-core cable. In this example, there are four insulated wire cores. The insulated wire cores are composed of a copper conductor 1 and an insulating layer 2 coated on the copper conductor 1. The copper conductor 1 It is formed by twisting multiple fine copper wires. The insulating layer 2 is a composite insulating layer composed of an inorganic mineral insulating tape wrapped around the cladding and a ceramic refractory composite tape wrapped around the cladding; the gaps between the insulated cores are filled with Inorganic fiber 5, the inorganic fiber 5 is preferably glass fiber; all insulated wire cores are twisted together to form a cable core, and there is a liner layer 3 on the periphery of the cable core, and the liner layer 3 is wrapped with ceramic refractory composite tape layer; the thermistor wire 4 is arranged between the liner layer 3 and the cable core, and the thermistor wire 4 runs through the cable longitudinally. Core surface; there is a metal sheath layer 6 on the periphery of the backing layer 3, and the metal sheath layer 6 is a corrugated copper strip layer.

The manufacturing steps of this cable:

⑴. Twisting the fine copper wire into a conductor, the material, diameter and number of strands of the fine copper wire are configured according to the design requirements;

(2) Wrap inorganic mineral insulating tape on the conductor, and then wrap ceramic refractory composite tape to form an insulating layer and make an insulated wire core;

⑶. Twisting multiple insulated wire cores to form a cable core, and the number of insulated wire cores is configured according to the design requirements;

⑷. The gaps between the insulated wire cores are filled with inorganic fibers and rounded up;

⑸, Wrap ceramic refractory composite belt to form a liner layer;

6. Arrange the thermistor wires between the liner and the cable core. The specification and quantity of the thermistor wires are configured according to the design requirements. If there are multiple wires, they should be evenly distributed along the circumference of the cable core;

(7) Longitudinal clad copper strip, welded by argon arc welding, and formed metal sheath layer by special wrinkle rolling equipment.

Claims (6)

1. A fireproof cable, comprising a conductor, an insulating layer, a backing layer, and a sheath layer arranged from the inside out, characterized in that the insulating layer is made of an inorganic mineral insulating tape around the cladding and a ceramic refractory composite tape. A composite insulation layer composed of cladding; between the insulation layer and the liner layer, a thermistor wire is also provided, and the thermistor wire runs through the cable longitudinally. 2. The fireproof cable according to claim 1, characterized in that the inorganic mineral insulating tape is one of mica tape, asbestos tape, and glass fiber tape. 3. The fireproof cable according to claim 1, characterized in that there are multiple thermistor wires, which are evenly distributed on the surface of the insulating layer along the circumferential direction of the insulating layer. 4. The fireproof cable according to claim 1, characterized in that, the sheath layer is a corrugated copper tape sheath layer. 5. The fireproof cable according to claim 1, wherein the conductor is formed by twisting multiple thin copper wires. 6. A fireproof cable, the cable is a multi-core cable with at least two insulated wire cores, characterized in that the insulated wire cores are made of a conductor and an insulating layer coated on the conductor, and the conductor is composed of multiple strands Fine copper wires are stranded, and the insulation layer is a composite insulation layer composed of inorganic mineral insulating tape around the cladding and ceramic refractory composite tape around the cladding; all insulated wire cores are twisted together to form a cable core, and the insulated wire The gaps between the cores are filled with inorganic fibers, the inorganic fibers are preferably glass fibers; there is a liner layer on the periphery of the cable core, and the liner layer is a ceramic refractory composite tape wrapping layer; between the cable core and the liner layer There are thermistor wires, the thermistor wires run through the cable longitudinally, and there are multiple thermistor wires, which are evenly distributed on the surface of the cable core along the circumferential direction of the cable core; there is a sheath layer of corrugated copper tape on the periphery of the liner layer.