CN210295933U

CN210295933U - Flame-retardant halogen-free low-smoke non-toxic cable

Info

Publication number: CN210295933U
Application number: CN201921070007.5U
Authority: CN
Inventors: 王琥
Original assignee: YUNNAN YUNLAN CABLE (GROUP) CO Ltd
Current assignee: YUNNAN YUNLAN CABLE (GROUP) CO Ltd
Priority date: 2019-07-10
Filing date: 2019-07-10
Publication date: 2020-04-10
Anticipated expiration: 2029-07-10

Abstract

The utility model discloses a flame-retardant halogen-free low-smoke nontoxic cable, which comprises a cable core consisting of a plurality of conductors, wherein the outer sides of the conductors are wrapped with a conductor shielding layer and an insulating layer in sequence; the gap of the cable core is filled with an inner fire-resistant heat-insulating layer, and the outer side of the cable core is sequentially wrapped with an aluminum foil heat-insulating sheath layer, an outer fire-resistant heat-insulating layer, a halogen-free expansion fire-resistant sheath and a water-resistant layer. Due to the arrangement of the halogen-free expansion fireproof sheath, when a fire disaster happens to the cable, a halogen-free expansion system in the halogen-free expansion fireproof sheath is dehydrated and decomposed to release a large amount of non-combustible gas and help the molten polymer to form charcoal, and an expanded charcoal layer is gradually formed along with the combustion, and the charcoal layer has uniform and compact pores, good mechanical strength, can effectively play a role in flame retardance and can reduce the invasion of heat; meanwhile, the cable can improve the selection range of the conductor and the insulating material in the cable.

Description

Flame-retardant halogen-free low-smoke non-toxic cable

Technical Field

The utility model relates to a cable, in particular to fire-retardant steamed low cigarette nontoxic cable that does not have halogen.

Background

With the rapid development of society, electric wires and cables are widely applied to various fields such as transportation, communication, buildings and the like. Meanwhile, with the wide application of the automation technology, various electrical facilities are increased, the load capacity of wires and cables is improved, and the possibility of fire disaster is increased. In the event of a fire, many cables of the prior art, due to the raw materials used, also emit large amounts of smoke and hydrogen halide gases, which are harmful to the environment and to surrounding personnel.

Meanwhile, according to national regulations, the fire-resistant cable must be required to be operated safely for 90min in an environment with a flame temperature of not less than 750 ℃. Although the fire-resistant cable on the market can basically reach the level of continuously and safely running for 3 hours at the temperature of 1000 ℃, the fire resistance of the sheath material is poor, the fire-resistant problem of the fire-resistant cable is generally solved by wrapping a mica tape and using an oxygen isolating layer, and the fire resistance of the structure is poor; meanwhile, when a fire disaster happens to the cable in the prior art, the heat insulation effect is poor, so that the space for selecting insulation and conductors in the cable is small when the cable is manufactured, for example, the conductors need to be selected from materials with high melting points, and the selection of the insulation materials is also limited.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a fire-retardant low cigarette nontoxic cable that has nothing, fire-retardant heat-proof quality is better, can improve cable inner conductor and insulating material's selection scope.

In order to solve the technical problem, the utility model discloses a technical scheme does:

a flame-retardant halogen-free low-smoke non-toxic cable comprises a cable core consisting of a plurality of conductors, wherein the outer sides of the conductors are sequentially wrapped with a conductor shielding layer and an insulating layer; the gap of the cable core is filled with an inner fire-resistant heat-insulating layer, and the outer side of the cable core is sequentially wrapped with an aluminum foil heat-insulating sheath layer, an outer fire-resistant heat-insulating layer, a halogen-free expansion fire-resistant sheath and a water-resistant layer.

Further, the insulating layer is a silicon rubber insulating layer.

Further, the thickness of the aluminum foil heat-insulating sheath layer is larger than 8 mm.

Further, the outer fire-resistant heat-insulating layer is a glass fiber tape.

Further, the inner fireproof heat insulation layer is made of high-temperature resistant glass fiber yarns or asbestos.

The utility model has the advantages that:

(1) the utility model provides a cable, owing to be provided with halogen-free inflation fire-resistant sheath for the cable is when the conflagration breaing out, and the halogen-free inflation system among the halogen-free inflation fire-resistant sheath dewaters and decomposes, emits a large amount of incombustible gases, and helps the fused polymer to become charcoal, goes on along with the burning, progressively forms the expanded carbon layer, and this carbon layer bubble is even, fine and close, water-fast drenches, has good mechanical strength, can effectively play flame-retardant action, reduces thermal invasion.

(2) The utility model is provided with the aluminum foil heat insulation sheath layer and the outer fire-resistant heat insulation layer on the inner side of the halogen-free expansion fire-resistant sheath, which can play a good heat insulation role for the cable core, and through the arrangement, aluminum with the melting point of 647 ℃ can be selected as a conductor material; the material of the insulating layer can be selected from silicon rubber, XLPE or polyimide, and the like, so that the inner conductor of the cable core and the insulating layer have a larger selection space.

(3) The utility model discloses compromise flame retardant property, mechanical properties and heat-proof quality's balance, flame retardance, heat-proof quality are strong, and comprehensive properties is good.

Drawings

Fig. 1 is a schematic structural diagram of the present embodiment.

In the figure, 1-conductor, 2-conductor shielding layer, 3-insulating layer, 4-inner fire-resistant heat-insulating layer, 5-metal sheath layer, 6-outer fire-resistant heat-insulating layer, 7-halogen-free expansion fire-resistant sheath, and 8-water-resistant layer.

Detailed Description

The following describes the present invention with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features related to the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in fig. 1, a flame-retardant, halogen-free, low-smoke and non-toxic cable comprises a cable core composed of a plurality of conductors 1, wherein 3 conductors 1 are arranged in the embodiment and are integrally arranged in a delta shape; the outer side of the conductor 1 is sequentially wrapped with a conductor shielding layer 2 and an insulating layer 3, and the conductor shielding layer 2 is wrapped on the outer side of the conductor 1, so that the electrostatic effect outside the conductor 1 is effectively shielded; the gap department of cable core is filled with interior fire-resistant insulating layer 4, and fire-resistant insulating layer 4's setting makes the structure of cable core compacter on the one hand, and on the other hand can play fire-resistant thermal-insulated effect, and has wrapped up in proper order in the outside of cable core aluminium foil thermal-insulated restrictive coating 5, outer fire-resistant insulating layer 6, no halogen inflation fire-resistant sheath 7 and water blocking layer 8. The arrangement of the aluminum foil heat-insulating sheath layer 5 is convenient for locking the internal structure of the cable, preventing the cable from loosening and playing a role in heat insulation; the design of the water-resistant layer 8 ensures that the cable can protect the cable sheath from aging in a higher humidity environment and prevent moisture from entering the inside of the cable.

The flame retardant mechanism of the halogen-free intumescent fire-resistant sheath 7 is as follows: the halogen-free expansion fireproof sheath mainly comprises an acid source, a gas source and a carbon source, wherein the acid source is ammonium polyphosphate, the gas source is melamine, and the carbon source is selected from pentaerythritol, dipentaerythritol, starch and other polyhydroxy compounds. Specifically, the acid source helps the high molecular polymer in the gas source and the carbon source to dehydrate and form carbon. When a fire disaster happens, the halogen-free expansion system in the halogen-free expansion fireproof sheath 7 dehydrates and decomposes to release a large amount of non-combustible gas and help the molten polymer to form carbon, and an expansion carbon layer is gradually formed along with the combustion, and the carbon layer has uniform and compact pores, good mechanical strength and can effectively play a role in flame retardance.

Specifically, the insulating layer 3 is a silicon rubber insulating layer. The silicon rubber insulating layer has the advantages of easily obtained raw materials, good insulating effect and high performance-price ratio.

Specifically, in order to guarantee the heat insulation effect, the thickness of the aluminum foil heat insulation sheath layer 5 is larger than 8 mm.

Specifically, the outer fire-resistant heat-insulating layer 6 is a glass fiber tape. The glass fiber belt is made of high-temperature-resistant and high-strength glass fibers through knitting or weaving, has a good heat insulation protection effect, and is wrapped in a spiral mode by 40-60% in an overlapping mode.

Specifically, the inner fire-resistant heat-insulating layer 4 is made of high-temperature-resistant glass fiber yarns or asbestos.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is to be accorded the full scope of the claims.

Claims

1. The utility model provides a fire-retardant halogen-free low smoke nontoxic cable, includes the cable core that constitutes by many conductors (1), its characterized in that: the outer side of the conductor (1) is sequentially wrapped with a conductor shielding layer (2) and an insulating layer (3); the cable comprises a cable core and is characterized in that an inner fire-resistant heat-insulating layer (4) is filled in the gap of the cable core, and an aluminum foil heat-insulating sheath layer (5), an outer fire-resistant heat-insulating layer (6), a halogen-free expansion fire-resistant sheath (7) and a water-resistant layer (8) are sequentially wrapped on the outer side of the cable core.

2. The flame-retardant, halogen-free, low-smoke and non-toxic cable according to claim 1, characterized in that: the insulating layer (3) is a silicon rubber insulating layer.

3. The flame-retardant, halogen-free, low-smoke and non-toxic cable according to claim 1, characterized in that: the thickness of the aluminum foil heat-insulating sheath layer (5) is larger than 8 mm.

4. The flame-retardant, halogen-free, low-smoke and non-toxic cable according to claim 1, characterized in that: the outer fire-resistant heat-insulating layer (6) is a glass fiber band.

5. The flame-retardant, halogen-free, low-smoke and non-toxic cable according to claim 1, characterized in that: the inner fireproof heat insulation layer (4) is made of high-temperature resistant glass fiber yarns or asbestos.