CN202422824U - Fireproof low-voltage cable - Google Patents

Abstract

A fire-proof low-voltage cable relates to an improvement of a fire-proof low-voltage cable structure. The utility model provides a fire-resistant low-voltage cable with good fire-proof effect, no length restriction, no intermediate joints, the same terminal joints as common low-voltage plastic cables, convenient installation and low cost. The utility model comprises an insulated wire core composed of a cable conductor, a high-temperature-resistant mica tape outside the cable conductor and an insulating layer outside the high-temperature-resistant mica tape; the outside of the insulated wire core is an outer sheath, and the outer sheath and Mineral powder mud is arranged between the insulated wire cores.

Description

A fireproof low voltage cable

technical field

The utility model relates to an improvement of a fireproof low-voltage cable structure.

Background technique

At present, the construction market, especially the buildings in the main public places, has higher and higher requirements for fire protection. It is required that the low-voltage power cables with fire resistance performance not only do not burn themselves, do not spread and expand the fire, but also require fire resistance in the case of flames, water and vibrations. Under normal power transmission, to win precious time for fire fighting and rescue of people's lives and property. Traditional fireproof cables generally use mineral insulation (magnesium oxide) and copper tube sheaths. Although they have certain fireproof performance, there are many problems. These problems are mainly due to the short length of manufacture. The core conductor makes the cable hard, hard to bend and straight, difficult to connect, easy to get damp at the end of the cable, reduces insulation resistance, consumes a lot of copper, and costs high, seriously affecting the use and promotion of fireproof cables.

Contents of the invention

The utility model aims at the above problems and provides a fire-resistant low-voltage cable with good fire-proof effect, no length limit for production, no intermediate joints, the same terminal joints as ordinary low-voltage plastic cables, easy installation and low cost.

In order to achieve the above-mentioned purpose of the utility model, the utility model adopts the following technical scheme, the utility model comprises an insulated wire core composed of a cable conductor, a high-temperature-resistant mica tape outside the cable conductor, and an insulating layer outside the high-temperature-resistant mica tape; the insulated wire The outside of the core is an outer sheath, and mineral powder mud is arranged between the outer sheath and the insulated wire core mentioned in the structural points.

Beneficial effects of the utility model: the utility model quickly ceramizes the mineral powder mud in case of fire, forming a hard shell, which plays the role of fire protection and cooling; the cable conductor is wrapped with multi-layer high-temperature-resistant mica tape to play the second function. The function of fireproof line, so the utility model has good fireproof effect.

The utility model realizes one cable with multiple cores, saves the copper sheath of the existing fireproof cable, can produce and deliver according to the length required by the user, does not need intermediate joints, and the terminal joints are the same as ordinary low-voltage plastic cables, easy to install and low in cost , has high application value.

Description of drawings

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

Fig. 2 is a schematic structural view of an embodiment of the present invention.

Fig. 3 is a schematic structural view of another embodiment of the present invention.

In the accompanying drawings, 1 is the outer sheath, 3 is the glass silk cloth tape, 4 is the insulating wire core, 5 is the mineral powder mud, 6 is the refractory filling rope, 7 is the insulating layer, 8 is the high temperature resistant mica tape, and 9 is the cable conductor.

Detailed ways

The utility model comprises an insulating wire core 4 composed of a cable conductor 9, a high-temperature-resistant mica tape 8 outside the cable conductor 9, and an insulating layer 7 outside the high-temperature-resistant mica tape 8; the outside of the insulating wire core 4 is an outer sheath 1, and its structure Mineral powder mud 5 is arranged between the outer sheath 1 and the insulated wire core 4 mentioned in the main points.

A glass cloth tape 3 is arranged between the mineral powder mud 5 and the outer sheath 1; the mineral powder mud 5 can be formed into a stable shape by winding the glass cloth tape 3, which is convenient for the production and use of cables.

The mineral powder mud 5 can be refractory soil (refractory soil can be purchased from the market).

As shown in Fig. 2 and Fig. 3, two or more than two insulated wire cores 4 may be provided.

When there are more than or equal to three insulated wire cores 4, fire-resistant filling ropes 6 can be arranged between the insulated wire cores 4.

Both the insulating layer 7 and the outer sheath 1 are made of halogen-free low-smoke flame-retardant polyolefin material.

The refractory filling rope 6 is composed of glass fiber and rock wool rope.

The cable conductor 9 of the utility model is made of a plurality of copper wires twisted and then wrapped with a high-temperature-resistant mica tape 8, and then extruded and wrapped with a halogen-free, low-smoke, flame-retardant polyolefin material as an insulating layer 7 to form an insulating core 4, which plays a color role. Marking function; when multiple insulated cores 4 are stranded, the center of the cable is filled with refractory filling rope 6 composed of glass fiber and rock wool rope; after cabled insulated cores 4 are extruded with mineral powder mud 5 for oxygen barrier Fireproof inner sheath. While extruding the mineral powder mud 5, the glass cloth tape 3 is wrapped around to ensure the stable circular state of the cable. Finally, extrude the halogen-free low-smoke flame-retardant polyolefin material as the outer sheath 1 .

The fire protection principle of the utility model is: when the cable encounters a fire, the mineral powder mud 5 is quickly ceramicized at high temperature, forming a honeycomb-shaped solid fire-proof, waterproof and shock-proof, cooling hard shell, so that the internal temperature of the cable is much lower than the external temperature. The hard shell and the fire-resistant filling rope 6 in the center of the cable position the insulated wire cores 4 together, so that they keep a distance from each other and do not touch each other; at the same time, the utility model is not afraid of external water and vibration, and can still continue to transmit electricity; People's lives and property win precious time.

Those of ordinary skill in the art should understand that the above specific descriptions about the utility model are only used to illustrate the utility model and are not limited to the technical solutions described in the embodiments, and the utility model can still be modified or equivalently replaced in order to To achieve the same technical effect, as long as the needs of use are met, it should be within the protection scope of the present utility model.

Claims (7)

1. a fire prevention low-voltage cable comprises the insulated wire cores (4) that is made up of high temperature resistant mica tape (8) outside cable conductor (9), the cable conductor (9) and the outer insulating barrier (7) of high temperature resistant mica tape (8); Insulated wire cores (4) is outer to be oversheath (1), it is characterized in that: be provided with mineral powder mud (5) between described oversheath (1) and the insulated wire cores (4).

2. a kind of fire prevention low-voltage cable according to claim 1 is characterized in that: be provided with glass fiber strap (3) between described mineral powder mud (5) and the oversheath (1).

3. a kind of fire prevention low-voltage cable according to claim 2 is characterized in that: described mineral powder mud (5) is seat clay.

4. a kind of fire prevention low-voltage cable according to claim 1 is characterized in that: described insulated wire cores (4) is set to more than two or two.

5. a kind of fire prevention low-voltage cable according to claim 4 is characterized in that: when insulated wire cores (4) more than or when equaling three, fire-resistant gasket for packing (6) is set between the insulated wire cores (4).

6. a kind of fire prevention low-voltage cable according to claim 1 is characterized in that: described insulating barrier (7) and oversheath (1) are processed by the halogen-free and low-smoke flame-retardant polyolefin material.

7. a kind of fire prevention low-voltage cable according to claim 5 is characterized in that: described fire-resistant gasket for packing (6) is made up of glass fiber and mineral wool rope.

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