CN2817005Y - Inorganic insulation flexible fire-retardant cable - Google Patents

Abstract

An inorganic insulated flexible fireproof cable belongs to the technical field of cables. There are 6 layers of mica-wrapped refractory insulating layers on the stranded copper alloy conductors, longitudinally wrapped and butt-welded copper alloy tubes are arranged on the refractory insulating layers, and non-spiral corrugated metal tubes are arranged on the copper alloy tubes. The sheath is an anti-corrosion sheath made of halogen-free low-smoke polyolefin material extruded on the outer surface of the metal sheath. The utility model has the advantages of reasonable and simple structure, easy manufacture and good fire resistance. With good flexibility, it can be used on low-voltage distribution lines in mobile places such as emergency generators, fire elevators and fire pumps. Good mechanical performance, convenient installation and laying, long service life. No radiation, no eddy current, strong overload capacity, high electricity safety, reliable and stable operation. The use temperature is not limited by the insulation temperature level, and the smoke-free and non-toxic is conducive to people's evacuation from the fire scene, and it is more conducive to firefighters to fight the fire.

Description

Inorganic Insulated Flexible Fireproof Cable

technical field

The utility model relates to a structure of a fire-resistant cable, which belongs to the technical field of cables.

Background technique

Existing fire-resistant cables are composed of conductors, insulating layers and sheaths. There are two main types: one is the combination of mica tape wrapping and plastic insulation. The cables with this structure have different fire resistance strengths due to the use of refractory materials. , can be divided into two types, A and B. The biggest advantage of this structure cable is that it is relatively soft and suitable for mobile applications. The fire-resistant temperature can reach above 950°C. The production length of the cable is not limited, the process is convenient to manufacture, and the cost is low. Excellent moisture-proof performance, but due to the use of plastic insulation, the use temperature level of this cable is limited by the use temperature level of the insulating material. Moreover, organic insulating materials are easy to burn, and will emit heat when burning, resulting in an increase in temperature, and finally lead to carbonization of the refractory tape, so this kind of cable is not resistant to mechanical vibration; For single use only. The other one uses copper core mineral insulated seamless copper tube sheath structure. The advantages of this cable are: due to the use of an all-inorganic structure, it is a real non-combustible cable. Rated up to 250°C, true radial water and moisture resistance thanks to the seamless copper tube sheath. But it also has defects. First of all, it is not suitable for mobile occasions. Once the copper tube is damaged, the cable insulation will drop rapidly, and the damaged point is difficult to find. Therefore, it is not suitable for a large number of applications. ) is easy to be damaged; secondly, the minerals used in this cable are easy to absorb moisture, so that the cable cannot be moisture-proof in the longitudinal direction, and the end uses sealant, which seriously affects the service life. In addition, the joint must be fully sealed, which invisibly increases the difficulty of construction . Existing fire-resistant cables can no longer meet the performance requirements of fire prevention and fire resistance required by modern construction, that is, the power supply must not be cut off in the event of a fire, and the purpose of safety must be achieved.

Utility model content

The purpose of this utility model is to provide an inorganic insulated flexible fireproof cable that can meet the fireproof and fireproof performance requirements required for modernization by improving the structure and materials for the shortcomings of the existing fireproof cables.

The purpose of this utility model is achieved in that the inorganic insulated flexible fireproof cable includes a conductor, an insulating layer and a sheath, and is characterized in that the conductor is provided with 6 layers of mica-wrapped fire-resistant insulating layers, and the fire-resistant insulating layer It is equipped with longitudinally wrapped and butt-welded copper alloy tubes and a non-spiral corrugated metal sheath on the copper alloy tubes, and an anti-corrosion sheath of halogen-free low-smoke polyolefin material is extruded on the metal sheath.

The conductor is a stranded copper alloy conductor. The mica wrapping tape is reinforced by non-alkali glass fiber cloth and composed of organic silica gel adhesive and mica paper.

The utility model has the advantages of reasonable and simple structure, easy manufacture and good fire resistance. The conductor is wrapped with six layers of mica tape as a fire-resistant insulating layer, so that the cable has the following characteristics:

1) The cable has excellent mechanical properties. At room temperature, its tensile strength can reach more than 100MPa, which improves the mechanical strength of the cable;

2) The cable has high flexibility. Due to the use of soft mica tape for wrapping insulation and soft stranded copper conductors, the flexibility of the cable is greatly increased, and the bending radius can reach 5 times the cable radius;

3) The cable has good fire resistance. Since the cable adopts all-inorganic insulation and corrugated copper tube metal sheath, the cable will not burn in the flame, so as long as the cable conductor and the sheath are not melted, the cable can be used continuously in the flame for a long time Without being damaged, its fire-resistant temperature can reach above 950 ° C, and its electrical performance will not be reduced in the flame, and the short-term overload safety performance of the cable is much higher than that of similar cables;

4) Good environmental protection performance, because the mica tape used does not burn, so it will not emit toxic gas and smoke that pollutes the environment, and the anti-corrosion sheath made of halogen-free low-smoke polyolefin material will not emit toxic gas and pollute the environment The smog is conducive to environmental protection;

5) It is easy to install and lay. Since the mica tape is not easy to absorb moisture, it is not necessary to design complicated joints or terminals like mineral insulated cables, and it is convenient and quick to install.

On the refractory insulating layer of the cable, longitudinal cladding, butt welding and corrugated copper tubes are set as the sheath, which further improves the performance of the cable:

1) The good moisture-proof performance of the cable is further improved. Because the copper sheath is butt-welded, the cable has good radial waterproof performance. Similarly, because the copper sheath has been treated with non-spiral embossing, the cable has good Longitudinal waterproof performance;

2) Environmental protection, because the copper alloy is used as the metal sheath and the anti-corrosion sheath of the halogen-free low-smoke polyolefin material, which ensures that no harmful substances are contained from the inside to the outside, and it is not necessary to consider that the cable will release harmful gases or substances during use. affect the surrounding environment;

3) Ensure the flexibility of the cable, because the copper sheath of the cable adopts the embossed structure, which greatly improves the flexibility of the cable;

4) The fire-resistant performance of the cable is improved. Because the copper does not burn, it will not emit heat, which will increase the overall temperature of the cable, thereby improving the fire-resistant performance of the cable.

The utility model also has the following characteristics:

1) Fire prevention, fire resistance, high humidity and temperature resistance, the melting point of copper sheath and copper core wire is 1083 ℃, and the fire resistance temperature of inorganic mica tape insulation material is also very high, so the cable has strong fire resistance and fire resistance, and is used in The low-voltage distribution lines of emergency generators, fire elevators and fire pumps can win time and provide guarantees for firefighters to fight fires;

2) Good mechanical performance, easy installation and laying, no need for additional joints or terminals, because the cloud bag belt does not absorb moisture, it does not need to ensure full sealing, and has a long service life;

3) High performance of fire prevention, waterproof and corrosion resistance. Through the corrugation of the copper tube, all the components of the cable are connected with threaded fasteners, and any moisture and flame cannot enter the equipment and the cable. The copper sheath itself has good anti-corrosion performance, and the cable does not need a plastic sheath in civil buildings. The copper sheath is butt-welded into a seamless copper tube, which can run safely and trouble-free for a long time even if it is soaked in water. The outer surface of the metal sheath is extruded with a layer of anti-corrosion sheath made of halogen-free and low-smoke polyolefin material, which makes the cable further Improve waterproof and corrosion resistance;

4) No radiation, no eddy current, strong overload capacity, high electricity safety, reliable and stable operation;

5) Because the mica tape is soft and the copper sheath is embossed, the cable has good flexibility and can be used in mobile occasions;

6) Due to the use of all inorganic insulation, the operating temperature of the cable is not limited by the insulation temperature grade;

7) Smoke-free and non-toxic are conducive to people's evacuation from the fire scene, and are more conducive to firefighters' fighting.

Description of drawings

Fig. 1 is the structural representation of the utility model;

In the figure: 1 conductor, 2 insulation layer, 3 metal sheath, 4 anti-corrosion sheath.

Detailed ways

On the solid copper alloy wire or copper alloy stranded conductor 1 with good electrical conductivity, six layers are wrapped with a mica-wrapped insulating layer 2 composed of non-alkali glass fiber cloth, which is composed of organic silica gel adhesive and mica paper. Longitudinal clad and butt-welded copper alloy tubes are set on the mica-wrapped insulation layer 2, and a non-spiral corrugated metal sheath 3 is set on the copper alloy tube, and the outer surface of the metal sheath 3 is extruded to wrap halogen-free and low-smoke Anti-corrosion sheath of polyolefin material 4.

Claims (3)

1. An inorganic insulated flexible fireproof cable, comprising a conductor, an insulating layer and a sheath, characterized in that the conductor is provided with 6 layers of mica-wrapped fire-resistant insulating layers, and the fire-resistant insulating layer is provided with longitudinal wrapping, Butt-welded copper alloy tubes are provided with a non-spiral corrugated metal sheath on the copper alloy tube, and an anti-corrosion sheath of halogen-free low-smoke polyolefin material is extruded on the metal sheath. 2. The inorganic insulated flexible fireproof cable according to claim 1, characterized in that said conductor is a stranded copper alloy conductor. 3. The inorganic insulated flexible fireproof cable according to claim 1, characterized in that the mica tape is reinforced with alkali-free glass fiber cloth and composed of organic silica gel adhesive and mica paper.