CN203102990U - A new type of halogen-free low-smoke flame-retardant fire-resistant power cable for rail transit - Google Patents

Abstract

The utility model discloses a novel halogen-free low-smoke flame-retardant fire-resistant power cable for rail traffic. The power cable comprises one to five conductors, an insulating layer and an outer sheath sleeved out of an external part of the cable, wherein the conductors are integrally cladded by the insulating layer, the inner side of the outer sheath is provided with a steel tape armor layer, a separation sleeve layer is in the steel tape armor layer, a cabling taped covering is in the separation sleeve layer, a filling layer is arranged between the cabling taped covering and the insulating layer, and the insulating layer, the outer sheath and the separation sleeve layer of the cable are made of ceramic silicone rubber and can rapidly become ceramics through sintering at a high temperature. The power cable provided by the utility model normally operates at a high temperature below 1300 DEG C and discharges no smog and poison gas, completely meeting national standards of China; an expensive mica tape refractory material is not used any more, and the cable has the advantages of convenient processing, simple flow, suitability for industrial production, easy popularization and excellent technical economy.

Description

A new type of halogen-free low-smoke flame-retardant fire-resistant power cable for rail transit

technical field

The utility model relates to a power cable, in particular to a novel halogen-free, low-smoke, flame-retardant and fire-resistant power cable.

Background technique

As we all know, wires and cables are known as the blood vessels and nerves of people's production and life: power transmission and distribution, transmission of information, but at the same time they are "fuse wires" that are easy to cause fires. The "secondary fire" accident caused greater losses to people's lives and property. Therefore, in many important occasions, such as subways, stations, shopping malls, etc., in case of fire, personnel evacuation, passageway lighting, fire alarm devices, automatic fire-fighting facilities and other emergency equipment all require cables to be able to operate within the specified range when a fire occurs. Maintain normal energization within a certain period of time, and at the same time require the cable to have low-smoke and non-toxic characteristics when burning. Therefore, people have developed a series of halogen-free, low-smoke, flame-retardant and fire-resistant cables.

Halogen-free, low-smoke, flame-retardant and fire-resistant cable: refers to the performance of the sample burning in the flame under the specified test conditions, and can still maintain normal operation for a certain period of time. At the same time, the cable has low-smoke and non-toxic characteristics when burning. Its fundamental characteristics are: the power cable can still maintain the normal operation of the line for a period of time under burning conditions and has low-smoke and non-toxic characteristics. In layman's terms, it can maintain a normal power supply for a period of time when a fire occurs to maintain lighting and signal transmission, while burning with low smoke and non-toxicity, protecting personnel from having enough time to evacuate safely, and is conducive to fire fighting and reducing losses.

At present, the common halogen-free low-smoke flame-retardant and fire-resistant power cables at home and abroad are mica tape-wrapped fire-resistant power cables. Packing—sheath; the mica tape plays a fire-resistant role; the insulating material is the same as that of ordinary power cables; the filling and wrapping materials can be ordinary materials or flame-retardant materials according to needs; the sheath material can be flame-retardant according to the fire-resistant grade PVC, low smoke, low halogen, halogen free, low toxicity sheath material.

The mica tape, which acts as fire-resistant insulation, is an insulating material made of mica paper and reinforcing electrical alkali-free glass fiber cloth with a suitable adhesive, which is baked and dried, and then cut. It is expensive and accounts for a large proportion of the cable cost. At the same time, during the production wrapping process, the mica powder is easy to fall off with the bending and winding of the tape, which directly affects the fire resistance of the product, and the mica tape is easy to be damp and cause power cable breakdown; the mica tape and the reinforcing layer must be wrapped. Coated on the surface of the power cable conductor, the process structure is complex, the wrapping speed is slow, and the efficiency is low, which affects the production efficiency of the product. In addition, the allowable working temperature of different mica tapes varies greatly, making processing difficult. The above various defects lead to unstable fire-resistant performance of power cables using mica tape fire-resistant, and the technical and economical efficiency is not high.

During the rapid development of my country's urban rail transit in the 21st century, the market demand for series wires and cables for rail transit is large, and the industrialization prospect is broad. Most of the cables used require low smoke, no (low) halogen, flame retardant, fire resistance and other characteristics. As the fire-resistant and fire-resistant requirements of wire and cable at home and abroad are gradually higher, traditional fire-resistant cables are limited by the limitations of materials and structural processes. More and more attention has been paid to the development of new fire-resistant and refractory materials and new structural processes for rail transit wires and cables.

Utility model content

The purpose of this utility model is to solve the above-mentioned shortcomings, and provide a new type of halogen-free low-smoke flame-retardant fire-resistant power cable. It is a material with excellent structure and performance, which greatly reduces the cost while meeting the halogen-free low flame retardancy and fire resistance performance, and has excellent technology and economy.

In order to solve the above-mentioned technical problems, the utility model adopts the following technical solutions:

The novel halogen-free, low-smoke, flame-retardant and fire-resistant power cable for rail transit of the utility model consists of a conductor, an insulating layer, a filling layer, a cabled wrapping layer, an insulating sheath layer, a steel tape armoring layer and an outer layer in sequence from the inner layer to the outer layer. The outer sheath, the inner layer structure of the cable is covered by the outer layer structure as a whole.

As a preferred manner: the number of the conductors is one to five.

As a preferred mode: conductors with different cross-sectional shapes can be flexibly selected according to the number of conductors and their cross-sectional areas. For example, when the cable contains five conductors with a cross-sectional area below ^35mm , the selected cross-section is Circular conductors; when the cable contains five conductors with a cross-sectional area above 35 mm ² , select a fan-shaped or triangular cross-sectional conductor.

As a preferred manner: the conductor is a copper conductor.

As a preferred mode: the insulating layer is ceramic silicon rubber specially used for fireproof and refractory wires and cables.

As a preferred mode: the filling layer is an asbestos flame-retardant filling layer, which is applied to the filling of multi-core cables to make the cables fire-resistant and round.

As a preferred manner: the cabled wrapping layer is a flame-retardant glass fiber tape.

As a preferred mode: the insulating sheath layer is ceramic silicone rubber specially used for fireproof and refractory wires and cables.

As a preferred mode: the steel tape armor layer is galvanized steel tape.

As a preferred mode: the silicone rubber outer sheath is ceramic silicone rubber specially used for fireproof and refractory wires and cables.

Compared with the prior art, the beneficial effects of the utility model are:

The utility model adopts ceramic silicon rubber as the material of the insulating layer, so that the insulating layer not only has the function of insulation but also has the function of fire resistance, and simplifies the structure of the cable. In addition, by setting a multi-layer ceramic silicon rubber structure, multiple protections are carried out for the cable, which ensures safety. higher.

The utility model flexibly adjusts the cross-sectional shape of the conductor according to the number of conductors and the cross-sectional area, so that the conductors are arranged more closely in the cable, and the space utilization rate and stability are improved.

The insulation layer, outer sheath layer and isolation sheath material of the halogen-free low-smoke flame-retardant fire-resistant power cable described in the utility model are ceramic silicon rubber layers, which are rapidly sintered into ceramics at high temperatures. It does not melt or drip in the environment, and plays a strong protective role, ensuring the normal operation of the cable, and there is no smoke and poisonous gas emission. It has been proved by the test that it fully meets the requirements of the national standard; it can be used in a fire without deformation, ensuring In the event of a fire, the circuit is unobstructed, and the expensive mica tape refractory material is no longer used. The structure is simple, the processing is convenient, the process is simple, it is suitable for industrial production, easy to promote, and has excellent technical economy.

Description of drawings

Fig. 1 is a schematic diagram of the internal structure of the utility model.

In the figure, 1 is a conductor, 2 is an insulating layer, 3 is a filling layer, 4 is a cable wrapping layer, 5 is an isolation sheath layer, 6 is a steel tape armor layer, and 7 is an outer sheath.

Detailed ways

Below in conjunction with specific embodiment and accompanying drawing, the utility model is further described.

Example 1

The halogen-free, low-smoke, flame-retardant and fire-resistant power cable of the utility model includes a ceramicized silicon rubber insulating layer 2, a conductor 1, and a ceramicized silicon rubber outer sheath 7 covering the outermost part of the cable, and the conductor 1 is made of ceramicized silicon rubber. The insulation layer 2 is integrally covered, and the inner side of the ceramicized silicone rubber outer sheath 7 is also provided with a steel tape armor layer 6. The inner side of 5 is the cabled wrapping layer 4, and a filling layer 3 is also arranged between the cabled wrapping layer 4 and the ceramic silicone rubber insulating layer 2; wherein the conductor 1 is a copper conductor, and the number is one to five; the filling layer 3 is The asbestos flame-retardant filling layer; the cable wrapping layer 4 is a flame-retardant glass ribbon; the steel tape armor layer 6 is a galvanized steel tape.

Example 2

The halogen-free, low-smoke, flame-retardant and fire-resistant power cable of the utility model consists of a conductor 1, an insulating layer 2, a filling layer 3, a cabled wrapping layer 4, an insulating sheath layer 5, and a steel tape armoring layer from the inner layer to the outer layer. 6 and the outer sheath 7, the inner layer structure of the cable is covered by the outer layer structure in turn. The number of conductors 1 is three, the filling layer 3 is a polypropylene plastic layer, the cable wrapping layer 4 is a reinforced light non-woven fabric, the steel tape armor layer 6 is a painted steel tape, the insulating layer 2, the isolation sheath layer 5 and the outer The sheath 7 is all special ceramic silicon rubber for fireproof and refractory wire and cable.

Example 3

As shown in the left part of Figure 1, a new type of halogen-free low-smoke flame-retardant fire-resistant power cable, from the inner layer to the outer layer is the conductor 1, the insulating layer 2, the filling layer 3, the cable wrapping layer 4, and the isolation layer. Sheath layer 5, steel tape armor layer 6 and outer sheath 7, the inner layer structure of the cable is covered by the outer layer structure as a whole in sequence. The conductors are five circular copper conductors with a cross-sectional area below 35 mm ² , the filling layer 3 is an asbestos flame-retardant filling layer, the cable wrapping layer 4 is a flame-retardant glass fiber tape, and the steel tape armor layer 6 is The galvanized steel strip, the insulation layer 2, the isolation sheath layer 5 and the outer sheath 7 are all ceramic silicone rubbers specially used for fireproof and refractory wires and cables.

Example 4

As shown in the right part of Figure 1, a new type of halogen-free low-smoke flame-retardant fire-resistant power cable, from the inner layer to the outer layer is the conductor 1, the insulating layer 2, the filling layer 3, the cable wrapping layer 4, and the isolation layer. Sheath layer 5, steel tape armor layer 6 and outer sheath 7, the inner layer structure of the cable is covered by the outer layer structure as a whole in turn. The conductors are five fan-shaped copper conductors with a cross-sectional area of 35 mm or ^more ; the filling layer 3 is an asbestos flame-retardant filling layer, the cable wrapping layer 4 is a flame-retardant glass fiber tape, and the steel tape armor layer 6 is a plated The zinc steel strip, the insulation layer 2, the isolation sheath layer 5 and the outer sheath 7 are all ceramic silicone rubbers specially used for fireproof and refractory wires and cables.

In the above-mentioned embodiment, when the cable is made, the stranding machine is used to twist the strands, and the ceramic silicone rubber extrusion line is used to extrude the ceramic silicone rubber on the conductor 1 to form the rubber insulating layer 2, and at the same time, it is detected online. Make the filling layer 3 and the cable wrapping layer 4 in the cable machine, extrude ceramic silicon rubber on the cable wrapping layer 4 with a ceramic silicone rubber extrusion production line to form an isolation sleeve 5, wrap it on a steel tape armoring machine Cover the steel tape to form the armor layer 6 , and finally use the ceramic silicon rubber extrusion production line to extrude the ceramic silicon rubber on the steel tape armor layer 6 to form the outer sheath 7 .

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models. the

Claims (10)

1. A new type of halogen-free, low-smoke, flame-retardant and fire-resistant power cable, characterized in that: the cable is composed of conductor (1), insulating layer (2), filling layer (3), and cabled winding from the inner layer to the outer layer. The cladding layer (4), the isolation sheath layer (5), the steel tape armor layer (6) and the outer sheath (7), the inner layer structure of the cable is covered by the outer layer structure as a whole in sequence. 2. The novel halogen-free, low-smoke, flame-retardant and fire-resistant power cable according to claim 1, characterized in that the number of said conductors (1) is one to five. 3. The novel halogen-free, low-smoke, flame-retardant and fire-resistant power cable according to claim 1, characterized in that: the cross-section of the conductor (1) is circular, triangular or fan-shaped. 4. The novel halogen-free, low-smoke, flame-retardant and fire-resistant power cable according to claim 1, characterized in that the conductor (1) is a copper conductor. 5. The novel halogen-free, low-smoke, flame-retardant and fire-resistant power cable according to claim 1, characterized in that: the insulating layer (2) is ceramic silicone rubber specially used for fire-proof and fire-resistant wires and cables. 6. The novel halogen-free low-smoke flame-retardant fire-resistant power cable according to claim 1, characterized in that: the filling layer (3) is an asbestos flame-retardant filling layer. 7. The novel halogen-free, low-smoke, flame-retardant and fire-resistant power cable according to claim 1, characterized in that: the cabled wrapping (4) is a flame-retardant glass ribbon. 8. The novel halogen-free, low-smoke, flame-retardant and fire-resistant power cable according to claim 1, characterized in that: the insulating sheath (5) is ceramic silicone rubber specially used for fire-proof and fire-resistant wires and cables. 9. The novel halogen-free, low-smoke, flame-retardant and fire-resistant power cable according to claim 1, characterized in that: the steel tape armor layer (6) is galvanized steel tape. 10. The novel halogen-free, low-smoke, flame-retardant and fire-resistant power cable according to claim 1, characterized in that: the silicone rubber outer sheath (7) is ceramic silicone rubber specially used for fire-proof and fire-resistant wires and cables.

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