CN202796162U - Fire-retarding type halogen-free low-smoke fire-resistant cable - Google Patents

Abstract

The utility model relates to a fire-resistant cable, in particular to a fire-blocking type halogen-free low-smoke cable. The invention belongs to the technical field of fire-resistant cable manufacture. The fire-resistant low-smoke, halogen-free fire-resistant cable consists of a conductive core, a heat-resistant composite insulation layer, a heat-resistant filling layer, a fire-resistant inner lining layer and a low-smoke, halogen-free flame-retardant polyolefin sheath layer from the inside to the outside. The copper conductor of the utility model is twisted with multi-strand copper wires, the structure is relatively soft and easy to bend; the fire-resistant composite insulating layer adopts a composite structure in which the inner insulation is made of inorganic mineral materials and the outer insulation is made of halogen-free, low-smoke, heat-resistant organic insulating materials. It plays the role of high temperature insulation, and the external insulation plays the role of heat-resistant protection. Its composite insulating layer can ensure good high-temperature-resistant insulation performance; the heat-resistant filling layer has a certain heat-insulating effect on the composite insulating layer at high temperature and reduces the insulation layer. Heat risk.

Description

Flame-resistant low-smoke halogen-free fire-resistant cable

technical field

The utility model relates to a fire-resistant cable, in particular to a fire-blocking type halogen-free low-smoke cable. The invention belongs to the technical field of fire-resistant cable manufacture. the

Background technique

The products that are close to the utility model in the prior art mainly contain the following categories:

① XLPE insulated low-smoke halogen-free flame-retardant polyolefin sheathed fire-resistant cable: the product consists of conductor, fire-resistant insulating layer, flame-retardant filling layer, and low-smoke halogen-free flame-retardant polyolefin sheath from inside to outside. Layer, this product can only pass the burning test of Class A fire resistance class. In the burning state, except for the fire-resistant insulating layer which plays a certain role of fire-resistant insulation and keeps the conductor energized for a short period of time, the rest of the structural materials will be burned. , under fire conditions, due to the impact of burning objects and the spraying of fire-fighting water, the fire-resistant insulation layer will be damaged and short-circuited, and the emergency power supply under physical fire conditions cannot be ensured;

②High-temperature fire-resistant cable: The product is composed of conductors, fire-resistant insulation layer, mineral composite oxygen barrier layer, and aluminum sheath tube from the inside to the outside. and spray test. Its main defect is that the mineral composite oxygen barrier layer is mainly composed of alumina material mixed into the colloidal material, which will crack after drying. In the burning state, after the aluminum sheath tube is melted at high temperature, the flame can be directly produced by cracking. The gap directly enters the fire-resistant insulation layer, so that the cable gradually loses its fire-resistant effect, and cannot guarantee a long-term emergency power supply. Its hard oxygen barrier layer and aluminum tube make it difficult for the cable to bend during laying and installation, and the construction is more difficult;

③ High-performance halogen-free flame-retardant fire-resistant cable: its structure is similar to the second type, except that the outer sheath adopts a halogen-free low-smoke flame-retardant sheath, which solves the problem of hard aluminum sheath and inconvenient construction, but The defect of drying and cracking of the mineral composite oxygen barrier material has not been solved. In the case that all structures of the cable are intact and unchanged, it can pass the burning test of Class A fire resistance class and the fire resistance, impact and spray tests stipulated in British BS6387, but due to The period from manufacture to construction of the product is often long, and the oxygen barrier layer is dry and cracked. In the burning state, the flame can still directly enter the refractory insulation layer through the gap generated by the crack. In addition, due to the use of plastic sheath, although in the To a certain extent, it solves the problem of difficult laying and bending, but when it is bent, it will be cracked due to the drying, cracking and hardening of the oxygen barrier layer, which will easily damage the internal refractory insulating layer, causing fatal damage to the cable, and even losing Insulated and scrapped.

Utility model content

The purpose of the utility model is to provide a fire-stop type halogen-free low-smoke cable to solve the above-mentioned technical problems. the

The above-mentioned technical purpose of the utility model is achieved through the following technical solutions:

Fire-resistant low-smoke, halogen-free, fire-resistant cables include a conductive core, a heat-resistant composite insulating layer, a heat-resistant filling layer, a fire-resistant inner lining, and a low-smoke, halogen-free, flame-retardant polyolefin sheath from the inside to the outside;

The conductive core is a copper wire with a cross-section of ^0.75-300mm2 ;

The heat-resistant composite insulating layer is a composite insulating layer that includes an inorganic wrapping layer and an organic extruded wrapping layer, wherein the inorganic wrapping layer is wrapped around a single conductive core and includes at least two layers with a thickness of 0.10 mm to 0.15 mm. The refractory inner insulating layer with the thickness of inorganic mineral insulating refractory tape is 0.5mm-0.7mm; Smoke-resistant organic insulation layer;

The heat-resistant filling layer is made of heat-resistant filling fibers;

The thickness of the fire-retardant lining layer is 1.0-2.0mm;

The thickness of the halogen-free low-smoke flame-retardant polyolefin sheath layer is 1.0-3.5mm.

The fire-resistant low-smoke halogen-free fire-resistant cable is composed of copper conductor, fire-resistant composite insulation layer, heat-resistant filling material, fire-resistant inner lining and low-smoke halogen-free flame-retardant sheath from the inside to the outside. The structure of this product is relatively soft, no toxic and harmful halogen gas is produced when burning, the amount of smoke is small, and the light transmittance is high. The metal fire barrier layer isolates the flame outside the fire barrier layer in the burning state. The non-combustible inorganic hard shell formed at high temperature constitutes the heat insulation and waterproof protective layer of the refractory composite insulation layer, which can pass the fire resistance, impact and spray tests stipulated in the fire test standards of my country and the British BS6387 standard to ensure the safety of the product in the event of fire. Good insulation state and maintain normal energization for a long time. the

Fire-resistant halogen-free low-smoke fire-resistant cables can be used in distribution trunk lines, emergency power supply lines, fire-fighting power supply and distribution lines, and fire-fighting facility control lines in various places and fields that require high fire resistance and must ensure personal and property safety. the

In the above technical solution of the utility model, the inorganic mineral insulating refractory tape is a tape made of inorganic insulating materials extracted from natural minerals and pasted on glass fiber cloth with adhesives, which can withstand flame burning at 950°C. For example, mica tape; the halogen-free low-smoke heat-resistant organic insulating layer does not produce halogen and very little smoke in the burning state (the light transmittance is not lower than 70%), and the normal working temperature is not lower than 90 ℃, at 200 High-molecular organic materials that will not melt or decompose below ℃, such as cross-linked polyethylene materials and silicone rubber materials. the

As a preference of the above technical solution, a layer of heat-resistant fiber tape is wrapped around the heat-resistant filling layer. the

The heat-resistant filling fiber is a fibrous material that can withstand a temperature of not lower than 600°C and will not undergo obvious shape changes, burn or decompose, such as alumina fiber rope. the

As a preference of the above-mentioned technical solution, the outer periphery of the metal fire-proof layer also has a layer of inorganic heat-resistant protective wrapping tape. the

Inorganic heat-resistant protective tape refers to the tape whose main material is inorganic, such as glass fiber tape and alumina fiber tape. The heat-resistant fiber tape is similar to the inorganic heat-resistant protective tape, except that the inorganic heat-resistant protective tape has a wider range, including flame-retardant tapes containing polymers. the

As a preference of the above technical solution, the conductive core is a single solid copper conductor or a copper conductor stranded by a stranding machine with multiple strands of round copper wires. the

As a preference of the above technical solution, there are 1-5 conductive cores. the

In summary, the utility model has the following technical effects:

1. The copper conductor is twisted with multiple strands of copper wire, the structure is relatively soft and easy to bend;

2. The fire-resistant composite insulating layer adopts a composite structure in which the inner insulation is made of inorganic mineral materials and the outer insulation is made of halogen-free low-smoke heat-resistant organic insulating materials. The inner insulation acts as high-temperature insulation, and the outer insulation acts as heat-resistant protection. The composite insulating layer can Ensure good high temperature resistance and insulation performance, and the structure is relatively soft and easy to bend;

3. The heat-resistant filling layer plays a certain heat insulation effect on the composite insulating layer at high temperature to reduce the high temperature risk of the insulating layer;

4. The fire-resistant inner lining is a mixture of powdery ceramic materials and heat-resistant silicone rubber. It is wrapped by extrusion vulcanization or processed into a fire-resistant tape. A hard ceramic protective shell is formed under combustion or high temperature conditions, which can prevent the entry of flames and spray water;

5. The sheath is made of halogen-free low-smoke flame-retardant polyolefin material extruded on the outer periphery of the fire-resistant lining, which plays a protective role under normal use conditions. When burning, it will not produce toxic and harmful halogens and very little smoke. Ensuring personal safety and the safety of fire-fighting electronic facilities in case of fire is conducive to the development of fire rescue.

6. The utility model has passed the fire-resistant class A and 950°C/180min fire-resistant test, as well as the fire-resistant test standard and the fire-resistant, impact and spray tests stipulated in the British BS6387 standard. the

Description of drawings

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

Fig. 2 is the structural representation of the second embodiment of the utility model;

Fig. 3 is the structural representation of the utility model embodiment three;

Fig. 4 is a schematic structural view of Embodiment 4 of the present utility model;

Fig. 5 is a schematic structural view of Embodiment 5 of the utility model;

In the figure, 1-conductive core, 2-heat-resistant composite insulation layer, 3-heat-resistant filling layer, 4-fire-resistant lining layer, 5-halogen-free low-smoke flame-retardant polyolefin sheath layer.

Detailed ways

Embodiment one

As shown in Figure 1, the fire-resistant type halogen-free low-smoke fire-resistant cable includes a conductive core 1, a heat-resistant composite insulation layer 2, a heat-resistant filling layer 3, a fire-resistant inner lining 4, and a halogen-free low-smoke fire-resistant cable. Flame-retardant polyolefin sheath layer 5;

The conductive core 1 is a copper wire with a cross section of ^0.75mm ;

The heat-resistant composite insulating layer 2 is a composite insulating layer including an inorganic wrapping layer and an organic extruded wrapping layer, wherein the inorganic wrapping layer is wrapped around a single conductive core and includes at least two layers of inorganic minerals with a thickness of 0.10 mm. A refractory inner insulating layer with a thickness of 0.5 mm for the insulating refractory tape; the organic extruded cladding layer is a halogen-free, low-smoke, heat-resistant organic insulating layer with a thickness of 0.6 mm extruded outside the refractory inner insulating layer;

The heat-resistant filling layer 3 is made of heat-resistant filling fibers;

The fire-resistant inner lining layer 4 is a fire-resistant inner lining layer formed by extrusion vulcanization or wrapping of silicone rubber, mineral ceramic powder and vulcanizing agent, with a thickness of 1.0 mm;

The thickness of the halogen-free low-smoke flame-retardant polyolefin sheath layer 5 is 1.0 mm.

Example two

As shown in Figure 2, the fire-resistant type halogen-free low-smoke fire-resistant cable includes a conductive core 1, a heat-resistant composite insulation layer 2, a heat-resistant filling layer 3, a fire-resistant inner lining 4, and a halogen-free low-smoke fire-resistant cable from the inside to the outside. Flame-retardant polyolefin sheath layer 5;

The conductive core 1 is a copper wire with a cross section of ^10mm ;

The heat-resistant composite insulating layer 2 is a composite insulating layer including an inorganic wrapping layer and an organic extruded wrapping layer, wherein the inorganic wrapping layer is wrapped around a single conductive core and includes at least two layers of inorganic minerals with a thickness of 0.12mm. A refractory inner insulating layer with a thickness of 0.5 mm for the insulating refractory tape; the organic extruded cladding layer is a halogen-free, low-smoke, heat-resistant organic insulating layer with a thickness of 0.8 mm extruded outside the refractory inner insulating layer;

The heat-resistant filling layer 3 is made of heat-resistant filling fibers;

The fire-resistant inner lining layer 4 is a fire-resistant inner lining layer formed by extrusion vulcanization or wrapping of silicone rubber, mineral ceramic powder and vulcanizing agent, with a thickness of 1.2 mm;

The thickness of the halogen-free low-smoke flame-retardant polyolefin sheath layer 5 is 1.5mm.

Embodiment three

As shown in Figure 3, the fire-resistant type halogen-free low-smoke fire-resistant cable includes a conductive core 1, a heat-resistant composite insulation layer 2, a heat-resistant filling layer 3, a fire-resistant inner lining 4, and a halogen-free low-smoke fire-resistant cable from the inside to the outside. Flame-retardant polyolefin sheath layer 5;

The conductive core 1 is a copper wire whose outer diameter cross-section is ^30mm ;

The heat-resistant composite insulating layer 2 is a composite insulating layer including an inorganic wrapping layer and an organic extruded wrapping layer, wherein the inorganic wrapping layer is wrapped around a single conductive core and includes at least two layers of inorganic minerals with a thickness of 0.12 mm. The thickness of the insulating refractory tape is a refractory inner insulating layer with a thickness of 0.6mm; the organic extruded cladding layer is a layer of halogen-free low-smoke heat-resistant organic insulating layer with a thickness of 1.0mm extruded outside the refractory inner insulating layer ;

The heat-resistant filling layer 3 is made of heat-resistant filling fibers;

The fire-resistant inner lining layer 4 is a fire-resistant inner lining layer formed by extrusion vulcanization or wrapping of silicone rubber, mineral ceramic powder and vulcanizing agent, with a thickness of 1.2 mm;

The thickness of the halogen-free low-smoke flame-retardant polyolefin sheath layer 5 is 1.5mm.

Embodiment four

As shown in Figure 4, the fire-resistant type halogen-free low-smoke fire-resistant cable includes a conductive core 1, a heat-resistant composite insulation layer 2, a heat-resistant filling layer 3, a fire-resistant inner lining 4, and a halogen-free low-smoke fire-resistant cable. Flame-retardant polyolefin sheath layer 5;

The conductive core 1 is a copper wire with a cross section of ^100mm ;

The heat-resistant composite insulating layer 2 is a composite insulating layer including an inorganic wrapping layer and an organic extruded wrapping layer, wherein the inorganic wrapping layer is wrapped around a single conductive core and includes at least two layers of inorganic minerals with a thickness of 0.13 mm. A refractory inner insulating layer with a thickness of 0.6 mm for the insulating refractory tape; the organic extruded cladding layer is a halogen-free, low-smoke, heat-resistant organic insulating layer with a thickness of 1.5 mm extruded outside the refractory inner insulating layer;

The heat-resistant filling layer 3 is made of heat-resistant filling fibers;

The fire retardant inner lining layer 4 is a fire retardant inner lining layer formed by extrusion vulcanization or wrapping of silicone rubber, mineral ceramic powder and vulcanizing agent, with a thickness of 1.5mm;

The thickness of the halogen-free low-smoke flame-retardant polyolefin sheath layer 5 is 2.5mm.

Embodiment five

As shown in Figure 5, the fire-resistant type halogen-free low-smoke fire-resistant cable includes a conductive core 1, a heat-resistant composite insulation layer 2, a heat-resistant filling layer 3, a fire-resistant inner lining layer 4, and a halogen-free low-smoke fire-resistant cable from the inside to the outside. Flame-retardant polyolefin sheath layer 5;

The conductive core 1 is a copper wire with a cross section of ^300mm ;

The heat-resistant composite insulating layer 2 is a composite insulating layer including an inorganic wrapping layer and an organic extruded wrapping layer, wherein the inorganic wrapping layer is wrapped around a single conductive core and includes at least two layers of inorganic minerals with a thickness of 0.15 mm. A refractory inner insulating layer with a thickness of 0.7 mm for the insulating refractory tape; the organic extruded cladding layer is a halogen-free, low-smoke, heat-resistant organic insulating layer with a thickness of 2.0 mm extruded outside the refractory inner insulating layer;

The heat-resistant filling layer 3 is made of heat-resistant filling fibers;

The fire-resistant inner lining layer 4 is a fire-resistant inner lining layer formed by extrusion vulcanization or wrapping of silicone rubber, mineral ceramic powder and vulcanizing agent, with a thickness of 2.0mm;

The thickness of the halogen-free low-smoke flame-retardant polyolefin sheath layer 5 is 3.5mm.

Claims (4)

1. Fire-resistant type halogen-free low-smoke fire-resistant cable, which is characterized in that: from the inside to the outside, it includes a conductive core (1), a heat-resistant composite insulating layer (2), a heat-resistant filling layer (3), and a fire-resistant inner lining layer (4) and halogen-free low-smoke flame-retardant polyolefin sheath layer (5); The conductive core (1) is a copper wire with a cross-section of ^0.75-300mm2 ; The heat-resistant composite insulating layer (2) is a composite insulating layer including an inorganic wrapping layer and an organic extruded wrapping layer, wherein the inorganic wrapping layer is wrapped around a single conductive core, including at least two layers with a thickness of 0.10 mm to 0.15 mm inorganic mineral insulating refractory tape with a thickness of 0.5mm to 0.7mm and a refractory inner insulating layer; the organic extruded cladding is a non-refractory layer with a thickness of 0.6 to 2.0mm extruded outside the refractory inner insulating layer Halogen low-smoke heat-resistant organic insulating layer; The heat-resistant filling layer (3) is made of heat-resistant filling fibers; The thickness of the fire-resistant lining layer (4) is 1.0-2.0 mm; The thickness of the halogen-free low-smoke flame-retardant polyolefin sheath layer (5) is 1.0-3.5mm. 2. A fire-resistant, halogen-free, low-smoke fire-resistant cable according to claim 1, characterized in that: the heat-resistant filling layer (3) is wrapped with a layer of heat-resistant fiber tape. 3. A fire-resistant halogen-free low-smoke fire-resistant cable according to claim 1 or 2, characterized in that: the conductive core (1) is a single solid copper conductor or a multi-strand round copper wire is stranded Machine-stranded copper conductors. 4. A fire-resistant, halogen-free, low-smoke fire-resistant cable according to claim 1 or 2, characterized in that there are 1-5 conductive cores (1).

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