CN220306021U - A concentric conductor low-smoke halogen-free fire-resistant power cable - Google Patents

Abstract

The utility model relates to a concentric conductor low-smoke halogen-free fire-resistant power cable, which belongs to the technical field of power cables, wherein a flame-retardant insulating layer is coaxially wrapped outside a cable core, an insulating shielding layer is wrapped outside the flame-retardant insulating layer, a concentric conductor is arranged outside the insulating shielding layer, a flame-retardant armor layer is coaxially wrapped outside the insulating shielding layer, the concentric conductor is arranged in the flame-retardant armor layer, a flame-retardant sheath layer is wrapped outside the flame-retardant armor layer, special magnesium oxide for wires and cables is filled between the flame-retardant insulating layer and the insulating shielding layer, and the speed of the temperature spreading to the cable core during flame combustion is delayed through flame-retardant rubber of the flame-retardant sheath layer; the rock wool of the flame-retardant sheath layer does not support combustion, the ceramic polyethylene hydrocarbon insulating layer adopted outside the wire core unit can be crusted when being subjected to flame high temperature, the insulating effect can be further achieved after the crusting, the fire-resistant mica tape improves the fire resistance of the wire core, normal transmission of current in the cable is guaranteed, and fire or circuit faults caused by short circuit can not be caused due to conductor contact between the high Wen Xianxin units.

Description

Low smoke zero halogen fire-resistant power cable of concentric conductor

Technical Field

The utility model belongs to the technical field of power cables, and particularly relates to a concentric conductor low-smoke zero-halogen fireproof power cable.

Background

With the development of modern science and technology, energy and information are indispensable resources, and no matter what electric energy or information is transmitted, cables are separated, but unsafe cables are also one of important ways for spreading fire. According to incomplete statistics, about 35% of accidents caused by cables in fire disaster are choked and dead people about one third of the accidents are choked and dead people because toxic gases released when the cables are inhaled and burnt. Thus, preventing the cable from burning and releasing toxic and harmful corrosive gases and fumes has been a problem that the cable industry must face.

The traditional protective layer material of the fire-resistant cable is mainly selected from halogen-containing materials such as fire-resistant polyvinyl chloride, chlorosulfonated polyethylene and the like to prevent fire spread. However, the fire-resistant cables belong to inflammable materials, and a large amount of toxic and harmful smoke and corrosive gas are released in the burning process of the materials, so that the poor light transmittance of the gas makes escape and rescue work on fire scene difficult, and the toxic gas is easy to suffocate people, so that the life and property safety of people is seriously endangered.

Disclosure of Invention

The utility model aims to solve the technical problems, and further provides a concentric conductor low-smoke halogen-free fireproof power cable.

The specific technical scheme of the utility model is as follows: a concentric conductor low smoke zero halogen fire resistant power cable comprising: the cable comprises a cable core, wherein a flame-retardant insulating layer is coaxially wrapped outside the cable core, an insulating shielding layer is coaxially wrapped outside the flame-retardant insulating layer, a plurality of concentric conductors are arranged on the outer circumference of the insulating shielding layer in an array mode, a flame-retardant armor layer is coaxially wrapped outside the insulating shielding layer, the concentric conductors are arranged in the flame-retardant armor layer, a flame-retardant sheath layer is coaxially wrapped outside the flame-retardant armor layer, and special magnesium oxide for wires and cables is filled between the flame-retardant insulating layer and the insulating shielding layer.

Further, the flame retardant insulating layer includes: the fire-resistant mica layer and the ceramic polyethylene hydrocarbon insulating layer are coaxially wrapped outside the wire core, and the ceramic polyethylene hydrocarbon insulating layer which forms a ceramic shell at a high temperature is coaxially wrapped outside the fire-resistant mica layer.

Further, the concentric conductor is characterized in that the concentric conductor is formed by twisting a plurality of copper wire cores.

Further, the flame retardant armor layer comprises: the first flame-retardant rubber layer is coaxially wrapped outside the insulating shielding layer, a galvanized steel wire layer is coaxially arranged in the first flame-retardant rubber layer, and a plurality of concentric conductors are arranged between the galvanized steel wire layer and the outer wall of the first flame-retardant rubber layer in a circumferential array.

Further, the flame retardant jacket layer includes: the second flame-retardant rubber layer is coaxially wrapped outside the flame-retardant armor layer, and a rock wool layer which goes out from fire is coaxially arranged in the second flame-retardant rubber layer.

Further, the first flame retardant rubber layer and the second flame retardant rubber layer are both polymers of halogen-free polyvinyl chloride and halogen-free nitrile rubber.

Further, the wire core is a silver-plated copper wire, and the thickness of the silver plating layer is 3-5 mu m.

The beneficial effects are that: the flame-retardant rubber of the flame-retardant sheath layer structurally ensures the speed of temperature spreading to the core wire core unit when flame burns, and improves the fire-resistant efficiency; the rock wool which is extinguished immediately after leaving fire by adopting the flame-retardant sheath layer can ensure that the rock wool does not support combustion when fire and flame burn, and is suitable for the structural requirements of the fireproof cable. The ceramic polyethylene hydrocarbon insulating layer adopted by each wire core unit can be crusted when being subjected to high temperature of flame, can not burn like crosslinked polyethylene, can still play insulating effect after being crusted, further improves the fire resistance and corrosion resistance of each wire core unit by adding the fire-resistant mica tape between the conductor and the ceramic polyolefin insulating layer, ensures normal transmission of current in the cable, and can not cause fire disaster or circuit failure caused by short circuit because of conductor contact between the wire core units after being subjected to high temperature.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic view of a layered structure of the present utility model;

the figure indicates:

the cable comprises a cable core 1, a flame-retardant insulating layer 2, a fire-resistant mica layer 21, a ceramic polyethylene hydrocarbon insulating layer 22, an insulating shielding layer 3, a concentric conductor 4, a flame-retardant armor layer 5, a galvanized steel wire layer 51, a first flame-retardant rubber layer 52, a flame-retardant sheath layer 6, a rock wool layer 61 and a second flame-retardant rubber layer 62.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "upper," "middle," "outer," "inner," and the like indicate an orientation or a positional relationship, and are merely for convenience of describing the present utility model and simplifying the description, but do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Example 1: a concentric conductor low smoke zero halogen fire resistant power cable, as described with reference to figure 1, comprising: the wire core 1 is coaxially wrapped with a flame-retardant insulating layer 2,

the flame-retardant insulating layer 2 is externally coaxially wrapped with an insulating shielding layer 3, a plurality of concentric conductors 4 are arranged on the outer circumference array of the insulating shielding layer 3, the insulating shielding layer 3 is coaxially wrapped with a flame-retardant armor layer 5, the concentric conductors 4 are arranged in the flame-retardant armor layer 5, the flame-retardant armor layer 5 is externally coaxially wrapped with a flame-retardant sheath layer 6, and special magnesium oxide for wires and cables is filled between the flame-retardant insulating layer 2 and the insulating shielding layer 3, so that the flame-retardant shielding layer is structurally provided with flame-retardant rubber, so that the speed of temperature spreading to a core wire core unit during flame combustion is ensured, and the flame-retardant efficiency is improved; the rock wool which is extinguished immediately after leaving fire by adopting the flame-retardant sheath layer can ensure that the rock wool does not support combustion when fire and flame burn, and is suitable for the structural requirements of the fireproof cable. The ceramic polyethylene hydrocarbon insulating layer adopted by each wire core unit can be crusted when being subjected to high temperature of flame, can not burn like crosslinked polyethylene, can still play insulating effect after being crusted, further improves the fire resistance and corrosion resistance of each wire core unit by adding the fire-resistant mica tape between the conductor and the ceramic polyolefin insulating layer, ensures normal transmission of current in the cable, and can not cause fire disaster or circuit failure caused by short circuit because of conductor contact between the wire core units after being subjected to high temperature.

Example 2: on the basis of the embodiment 1, the description is made with reference to fig. 1 and 2, and the flame retardant insulating layer 2 includes: the fire-resistant mica layer 21 and the ceramic polyethylene hydrocarbon insulating layer 22, the fire-resistant mica layer 21 is wrapped in to the coaxial core outside the sinle silk 1, the ceramic polyethylene hydrocarbon insulating layer 22 that forms ceramic shell under the high temperature state is wrapped in to the coaxial core outside the fire-resistant mica layer 21, so set up, through the concrete structure diagram that increases fire-retardant insulating layer 2, fire-resistant mica tape 21 and ceramic polyethylene hydrocarbon insulating layer 22, ceramic polyethylene hydrocarbon insulating layer can crust when receiving flame high temperature, guarantee the intensity of cable, fire-resistant mica tape 21 keeps insulating under the high temperature state simultaneously, can not cause bigger conflagration because of the short circuit.

Example 3: on the basis of the embodiment 1, the description is made with reference to fig. 1 and 2, and the concentric conductor 4 is formed by twisting a plurality of copper wire cores, so that the concentric conductor formed by twisting a plurality of copper wire cores has better shielding effect.

Example 4: on the basis of the embodiment 1, the description is made with reference to fig. 1 and fig. 2, and the flame retardant armor layer 5 includes: the first flame retardant rubber layer 52 is wrapped with the first flame retardant rubber layer 52 in a coaxial manner outside the insulating shielding layer 3, a galvanized steel wire layer 51 is arranged in the first flame retardant rubber layer 52 in a coaxial manner, a plurality of concentric conductors 4 are arranged between the galvanized steel wire layer 51 and the outer wall of the first flame retardant rubber layer 52 in a circumferential array manner, and the flame retardant rubber of the flame retardant sheath layer ensures the speed of the flame to spread to the core wire core unit during flame combustion, and improves the flame retardant efficiency.

Example 5: on the basis of example 4, referring to fig. 1 and 2, the flame retardant sheath layer 6 includes: the second flame-retardant rubber layer 62, the outer coaxial parcel of flame-retardant armor 5 has second flame-retardant rubber layer 62, and coaxial in the second flame-retardant rubber layer 62 is provided with the rock wool layer 61 that goes out promptly from the fire, so set up, guaranteed through adding rock wool layer 61 that under the condition of no open flame, the cable can not continue burning.

Example 6: on the basis of example 5, referring to fig. 1 and 2, the first flame retardant rubber layer 52 and the second flame retardant rubber layer 62 are both polymers of halogen-free polyvinyl chloride and halogen-free nitrile rubber, and by the arrangement, the halogen-free polyvinyl chloride and halogen-free nitrile rubber polymers ensure that no harmful gas is generated during combustion, and meanwhile, the halogen-free nitrile rubber added with halogen-free polyvinyl chloride ensures flexibility and also generates fire resistance.

Example 7: on the basis of the embodiment 1, the explanation is made with reference to fig. 1, the wire core 1 is a silver-plated copper wire, and the thickness of the silver plating layer is 3-5 μm, so that the transmission effect is ensured and the cost is controlled by limiting the thickness of the silver plating layer.

The working process comprises the following steps:

the flame-retardant rubber of the flame-retardant sheath layer ensures the speed of spreading the temperature to the core wire core unit when the flame burns, improves the fire-resistant efficiency, adopts the rock wool of which the flame is extinguished when the flame burns and the flame burns, ensures that the ceramic polyethylene hydrocarbon insulating layer adopted by each wire core unit can not be encrusted when the flame burns and the high temperature is received, can not burn like crosslinked polyethylene, can still play an insulating effect after the encrusted, improves the fire resistance and corrosion resistance of each wire core unit by adding the fire-resistant mica tape between the conductor and the ceramic polyolefin insulating layer, ensures the normal transmission of current in the cable, and can not cause the fire or circuit fault caused by short circuit because of the conductor contact between the wire core units after corrosion.

In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the utility model disclosed above are intended only to assist in the explanation of the utility model. The preferred embodiments are not exhaustive or to limit the utility model to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best understand and utilize the utility model. The utility model is limited only by the claims and the full scope and equivalents thereof.

Claims (6)

1. A concentric conductor low-smoke halogen-free fire-resistant power cable, including: a wire core (1), the outer coaxial center of the wire core (1) is wrapped with a flame-retardant insulating layer (2), characterized by: The flame-retardant insulating layer (2) is wrapped with an insulating shielding layer (3) on the outer coaxial center. The outer circumferential array of the insulating shielding layer (3) is provided with a plurality of concentric conductors (4). The outer coaxial core of the insulating shielding layer (3) is The core is wrapped with a flame-retardant armor layer (5), the concentric conductor (4) is placed in the flame-retardant armor layer (5), and the flame-retardant armor layer (5) is coaxially wrapped with a flame-retardant sheath layer. (6). Magnesium oxide specially used for wires and cables is filled between the flame-retardant insulation layer (2) and the insulation shielding layer (3). 2. A concentric conductor low-smoke halogen-free fire-resistant power cable according to claim 1, characterized in that the flame-retardant insulation layer (2) includes: a fire-resistant mica layer (21) and a ceramicized polyethylene hydrocarbon insulation layer (22), the outer coaxial center of the wire core (1) is wrapped with a refractory mica layer (21), and the outer coaxial center of the refractory mica layer (21) is wrapped with ceramic polyethylene insulation that forms a ceramic shell at high temperature. Layer(22). 3. A concentric conductor low-smoke halogen-free fire-resistant power cable according to claim 1, characterized in that the concentric conductor (4) is made of multiple strands of copper wire cores twisted together. 4. A concentric conductor low-smoke halogen-free fire-resistant power cable according to claim 1, characterized in that the flame-retardant armor layer (5) includes: a first flame-retardant rubber layer (52), the insulation The shielding layer (3) is coaxially wrapped with a first flame-retardant rubber layer (52), and a galvanized steel wire layer (51) is coaxially arranged inside the first flame-retardant rubber layer (52). A plurality of the concentric conductors (4) are arranged in a circumferential array between the steel wire layer (51) and the outer wall of the first flame-retardant rubber layer (52). 5. A concentric conductor low-smoke halogen-free fire-resistant power cable according to claim 4, characterized in that the flame-retardant sheath layer (6) includes: a second flame-retardant rubber layer (62), and the flame-retardant sheath layer (6) A second flame-retardant rubber layer (62) is coaxially wrapped outside the flame armor layer (5), and a rock wool layer (61) that is extinguished upon leaving the fire is coaxially arranged inside the second flame-retardant rubber layer (62). 6. A concentric conductor low-smoke halogen-free fire-resistant power cable according to claim 1, characterized in that the received wire core (1) is a silver-plated copper wire, and the silver-plated layer has a thickness of 3-5 μm.