CN202871387U - A highly flexible fireproof power cable - Google Patents

Abstract

The utility model discloses a highly flexible fireproof power cable, which comprises a cable core, the cable core is formed by twisting several insulated wire cores; The fire-proof and heat-insulating layer of glass fiber tape and ceramicized fire-resistant and refractory silicone rubber composite tape layer, the fire-proof and heat-insulating layer is extruded with galvanized steel strip or stainless steel belt, and the armored fire-blocking layer of buckle-type interlocking armor is in the cable. The outermost layer is extruded with an environmentally friendly flame-retardant low-smoke halogen-free polyolefin outer sheath. The utility model is a high-flexibility fireproof power cable with an aluminum alloy conductor with good economy, high flexibility, good bendability, and convenient processing, installation and laying.

Description

A highly flexible fireproof power cable

technical field

The utility model relates to the field of wires and cables, in particular to a flexible fireproof cable using a new type of aluminum alloy conductor material and inorganic insulation and interlocking armored structure.

Background technique

With the rapid development of our country's economy, there are more and more high-rise and super-large buildings in domestic cities and towns. Due to the dense population in the buildings, in addition to requiring complete safety and fire-fighting facilities, once a fire occurs, its control power, monitoring, guidance, etc. The wiring to the system such as the lead and the alarm must also maintain normal operation. For buildings, fire safety is the most important, the most concerned and the most important issue to be solved. At present, in some large and medium-sized cities, it has been clearly required that public buildings, high-rise buildings, and super-large buildings need to use environmentally friendly flame-retardant and fire-resistant cables to prevent the normal power supply of the power supply line within a predetermined time in the event of a fire, and It will not produce toxic and harmful gases due to combustion. In this way, it is required that these important lines must use safe and reliable fireproof cables.

Fireproof cables in the prior art usually use plastic or rubber for insulation. When the cable line encounters a fire situation, the insulation and sheath materials will burn out, and harmful smoke and other substances will be produced. Once burned, the cable line can no longer be used. Mineral insulated cables with magnesium oxide and mica tape as insulation, copper tube or argon arc welding copper strip and corrugated mineral insulated cables have improved the above shortcomings, but due to manufacturing reasons, magnesium oxide insulated cables cannot be made due to the limitation of the length of copper tubes. To the required large length, and the cable is very hard, poor flexibility, difficult to bend, which brings great inconvenience to installation and laying; magnesium oxide and mica tape are also easy to absorb moisture, which reduces the insulation effect; and this cable conductor and protection The sleeves are made of copper, and the product cost is extremely high, and the economy is poor.

Utility model content

The technical problem to be solved by the utility model is to provide a highly flexible fireproof power cable with an aluminum alloy conductor, which has good economical efficiency, high flexibility, good bendability, and convenient processing, installation and laying.

A highly flexible fireproof power cable described in the utility model includes a cable core, and the cable core is formed by twisting several insulated wire cores; a filling layer is provided at the gap between the cable cores, and the cable core is wrapped around the cable core for fire protection. For the heat insulation layer, an armored fire barrier layer is extruded outside the fireproof heat insulation layer, and an outer sheath is extruded on the outermost layer of the cable.

In the present invention, preferably, the insulated wire core is composed of a conductor and an insulating layer wrapped around the conductor.

In the present utility model, preferably, there are one or more insulated wire cores.

In the present utility model, preferably, the fire-proof and heat-insulating layer is composed of multi-layer glass fiber tapes and ceramicized fire-proof and refractory silicone rubber composite tape layers.

In the present utility model, preferably, the armored fire-blocking layer is galvanized steel strip or stainless steel strip inner buckle type interlocking armor.

In the present utility model, preferably, the outer sheath is an environmentally friendly flame-retardant low-smoke halogen-free polyolefin extruded sheath layer.

In the present utility model, preferably, the insulating layer adopts a multi-layer wrapping structure of ceramicized fireproof and refractory silicone rubber composite tape.

The beneficial effects of the utility model are:

(1) The aluminum alloy conductor cable has excellent performance, good conductor flexibility, and the compressive creep performance is similar to that of the copper conductor. It can equivalently replace the copper conductor cable and solve the problems of easy oxidation and poor creep resistance of the electrical pure aluminum conductor. Moreover, the material cost is low and the economic performance is excellent, which can save a lot of investment cost.

(2) The cable insulation is wrapped with multi-layer ceramicized fireproof and refractory silicone rubber composite tape. The insulation layer has high strength, softness, elasticity, self-adhesiveness, good sealing performance, no moisture absorption, no water absorption, and is not afraid of spraying and vibration; Excellent mechanical and electrical insulation properties; halogen-free, low-smoke, no heavy metals, non-toxic and harmless, the safety level of smoke toxicity reaches ZA1, the highest safety level of polymer materials, and will not cause secondary harm to people; it can be used at 350°C and The above starts to harden, up to 3000°C. As the temperature rises, it is quickly fired into a ceramic-like hard and complete shell. The longer the ablation time, the higher the temperature, the harder the hard shell after burning. Armoring plays a very good role in protecting the line and ensuring the smooth flow of the line in case of fire.

(3) There is a layer of galvanized steel strip or stainless steel interlocking armor fire barrier outside the cable core. The buckle-type interlocking armor structure in the steel strip is tight and firm, and can withstand high temperature combustion at 1400 °C without melting. Strong impact resistance, and the cable has excellent flexibility and bending performance, which can reach the requirement of 7 times the bending radius.

(4) There are multi-layer glass fiber tapes and ceramic fire-resistant and refractory silicone rubber composite tape fire-proof and heat-insulating layers in the cable interlocking armored fire-resisting layer. When burning, the fiber mesh seal forms a good flame-retardant and heat-insulating layer, which can limit or greatly reduce the conduction of external high temperature to the inner sheath and insulation, protect the internal core from damage, and improve the fire resistance, high temperature resistance and flame retardancy of the cable and heat insulation performance, which can ensure that the cable can be used normally for a long time under the condition of burning.

(5) The inner interlocking armored fire barrier is extruded with an environmentally friendly flame-retardant low-smoke halogen-free polyolefin extruded sheath layer, which can well protect the interlocking armored layer and prevent armored corrosion, water ingress, and penetration. When burning in a fire, it has good flame retardant performance, low smoke, non-toxic, no harm to the human body, and is conducive to people's escape.

Description of drawings

Fig. 1 is a schematic diagram of a single core structure of the present invention.

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

Detailed ways:

Example 1:

As shown in Figure 1, a highly flexible fireproof power cable described in the present invention includes a cable core, the cable core is composed of an insulated core, and the insulated core is wrapped by the conductor 1 and the conductor 1 The insulation layer 2 is composed of the cable core; the fireproof and heat-insulating layer 3 is wrapped with multi-layer glass fiber tape and ceramic fire-resistant and refractory silicone rubber composite tape layer outside the cable core, and the galvanized steel strip or stainless steel strip is extruded outside the fire-proof and heat-insulating layer 3 The armored fire-blocking layer 4 of inner buckle-type interlocking armor is extruded on the outermost layer of the cable with an environment-friendly flame-retardant low-smoke halogen-free polyolefin outer sheath 5 .

Example 2:

As shown in Figure 2, the difference between this embodiment and Embodiment 1 is that the insulated wire core is changed from one to four, and the four insulated wires are twisted into a cable core, and a filling layer 6 is provided in the gap of the cable core. . the

The utility model provides a structure form and implementation method of a highly flexible fireproof power cable. The above description is only the preferred implementation method of the utility model. Under the premise of the novel principle, some improvements can also be made, and these improvements should also be regarded as the protection scope of the present utility model.

Claims (7)

1. a high flexibility fire proof power cable comprises cable core, it is characterized in that: its cable core forms by several insulated wire cores are stranded; Gap location at cable core is provided with packed layer (6), and wrapped fire proof heat-insulation layer (3) outside cable core extrudes armouring gear fire bed (4) outside fire proof heat-insulation layer (3), extrude oversheath (5) at the cable outermost layer.

2. high flexibility fire proof power cable according to claim 1 is characterized in that: described insulated wire cores is made of conductor (1) and wrapped insulating barrier (2) outside conductor (1).

3. high flexibility fire proof power cable according to claim 1 is characterized in that: described insulated wire cores is one or more.

4. high flexibility fire proof power cable according to claim 1, it is characterized in that: described fire proof heat-insulation layer (3) is made of compound glass fabric strip and the compound belt of ceramic fireproof＝fire-proof silicon rubber.

5. high flexibility fire proof power cable according to claim 1 is characterized in that: described armouring gear fire bed (4) is the chain armouring of buckle type in galvanized steel strip or the stainless steel band.

6. high flexibility fire proof power cable according to claim 1, it is characterized in that: described oversheath (5) extrudes restrictive coating for a kind of environmental-protection flame-retardant low-smoke halogen-free polyolefin.

7. high flexibility fire proof power cable according to claim 2 is characterized in that: described insulating barrier (2) employing ceramic fireproof＝fire-proof silicon rubber composite band multilayer lapping structure.

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