CN110880384A

CN110880384A - High-flame-retardance low-release halogen-free low-smoke B1-level control cable

Info

Publication number: CN110880384A
Application number: CN201910982959.2A
Authority: CN
Inventors: 黄晓军; 余静成; 张灿
Original assignee: Anhui Shangwei Cable Co Ltd
Current assignee: Anhui Shangwei Cable Co Ltd
Priority date: 2019-10-16
Filing date: 2019-10-16
Publication date: 2020-03-13

Abstract

The invention relates to the technical field of control cables, in particular to a high-flame-retardant low-release halogen-free low-smoke B1-grade control cable which comprises a plurality of leads, wherein the leads sequentially comprise a conductor, a fire-resistant mica tape and an insulating layer from inside to outside; the outer sides of the plurality of wires are provided with cabling belting layers; flame-retardant filler is arranged in a gap between the conducting wire and the cabling wrapping tape layer; a shielding layer is arranged on the outer side of the cabling belting layer, and a heat insulation layer is arranged on the outer side of the shielding layer; the heat insulation layer comprises a first glass fiber cloth layer arranged on the inner layer, a second glass fiber cloth layer arranged on the outer layer and calcium silicate arranged between the first glass fiber cloth layer and the second glass fiber cloth layer; the outer side of the heat-insulating layer is extruded with an outer sheath layer which is made of halogen-free low-smoke polyethylene material; the invention provides a high-flame-retardance low-release halogen-free low-smoke B1-grade control cable which is simple in structure, high in flame retardance and low in release and better meets the requirement of environmental protection.

Description

High-flame-retardance low-release halogen-free low-smoke B1-level control cable

Technical Field

The invention belongs to the technical field of control cables, and particularly relates to a high-flame-retardant low-release halogen-free low-smoke B1-grade control cable.

Background

The flame retardant property of the common control cable usually only attaches importance to the fire resistance of the cable in flame, but neglects the combustion substances generated after the cable reaches an ignition point, but in fire safety, the combustion substances generated after the cable ignites can play a role in supporting combustion with the combustion of the surrounding environment; the toxicity and corrosivity of drops, particles and flue gas in the combustion products can be greatly harmful.

Disclosure of Invention

Compared with the traditional flame-retardant cable, the flame-retardant cable belongs to a safe cable, and not only is the combustion resistance of the cable body examined, but also the influence degree on the environment in the combustion process is examined; directly simulating the actual use condition of the cable, and comprehensively checking the combustion performance of the cable by checking the heat quantity, heat release rate, total smoke production amount, smoke production rate and combustion growth rate of the cable in the combustion process;

in order to solve the problems in the background art, the invention provides a high-flame-retardance low-release halogen-free low-smoke B1-grade control cable which is simple in structure, high in flame retardance and low in release, and better meets the requirement of environmental protection.

In order to achieve the purpose, the invention provides the following technical scheme: a high-flame-retardant low-release halogen-free low-smoke B1-grade control cable comprises a plurality of leads, wherein the leads sequentially comprise a conductor, a fire-resistant mica tape and an insulating layer from inside to outside; the outer sides of the plurality of wires are provided with cabling belting layers; flame-retardant filler is arranged in a gap between the conducting wire and the cabling wrapping tape layer; a shielding layer is arranged on the outer side of the cabling belting layer, and a heat insulation layer is arranged on the outer side of the shielding layer; the heat insulation layer comprises a first glass fiber cloth layer arranged on the inner layer, a second glass fiber cloth layer arranged on the outer layer and calcium silicate arranged between the first glass fiber cloth layer and the second glass fiber cloth layer; the outer side of the heat insulation layer is extruded and wrapped with an outer sheath layer, and the outer sheath layer is made of halogen-free low-smoke polyethylene materials.

Further, the number of the wires ranges from 2 to 61; the conductor is made of annealed tin-plated soft copper wires.

Furthermore, the shielding layer is formed by weaving tinned copper wires, and the weaving coverage rate of the shielding layer is not less than 85%.

Further, an armor layer is arranged on the outer side of the outer sheath layer; the armor layer is a double-steel-belt armor layer.

Furthermore, the insulating layer is made of cross-linked polyethylene materials in an extrusion wrapping mode.

Further, the cabling wrapping tape layer is made of polyester tapes.

Furthermore, the flame-retardant filler is a glass fiber rope.

Compared with the prior art, the invention has the beneficial effects that:

on the premise of meeting the flame-retardant grade-1 (B1) combustion performance specified by the GB 31247-2014 standard, the invention refers to GB/T9330-2008 plastic insulation control cable, GB 31247-2014 cable and optical cable combustion performance grading, and can ensure that the electrical performance, the mechanical performance and the bending performance of the cable can all meet the specification of the national standard.

1. The lead sequentially comprises a conductor, a fire-resistant mica tape and an insulating layer from inside to outside; the fire-resistant mica tape has excellent high-temperature resistance and combustion resistance, and basically does not volatilize harmful smoke when burning in open flame; flame-retardant fillers are arranged in gaps between the wires and the cabling wrapping tape layer, so that the cable has high flame-retardant performance;

2. the heat insulation layer comprises a first glass fiber cloth layer arranged on the inner layer, a second glass fiber cloth layer arranged on the outer layer and calcium silicate arranged between the first glass fiber cloth layer and the second glass fiber cloth layer; the calcium silicate is a common refractory material, and the heat-insulating layer has strong fire resistance, acid and alkali resistance and corrosion resistance; the glass fiber cloth layer is inorganic fiber, is never burnt, has high tensile strength and length stability, and has excellent heat resistance.

3. The outer side of the heat insulation layer is extruded with an outer sheath layer which is made of halogen-free low-smoke polyethylene material, thus meeting the requirement of environmental protection.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural diagram of the present invention.

In the figure: 1. a wire; 101. a conductor; 102. fire-resistant mica tapes; 103. an insulating layer; 2. a cabling tape layer; 3. a flame retardant filler; 4. a shielding layer; 5. a thermal insulation layer; 501. a first fiberglass cloth layer; 502. calcium silicate; 503. a second fiberglass cloth layer; 6. an outer jacket layer; 7. an armor layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clear and fully described, embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of some embodiments of the invention and are not limiting of the invention, and that all other embodiments obtained by those of ordinary skill in the art without the exercise of inventive faculty are within the scope of the invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "a," "an," "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

For the purposes of simplicity and explanation, the principles of the embodiments are described by referring mainly to examples. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. It will be apparent, however, to one skilled in the art that the embodiments may be practiced without these specific details. In some instances, well-known methods and structures have not been described in detail so as not to unnecessarily obscure the embodiments. In addition, all embodiments may be used in combination with each other.

Referring to fig. 1, the present invention provides the following technical solutions: a high-flame-retardant low-release halogen-free low-smoke B1-grade control cable comprises a plurality of leads 1, wherein each lead 1 sequentially comprises a conductor 101, a fire-resistant mica tape 102 and an insulating layer 103 from inside to outside; a cabling belting layer 2 is wound on the outer side of the plurality of wires 1; a gap between the lead 1 and the cabling wrapping band layer 2 is filled with a flame-retardant filler 3; a shielding layer 4 is arranged on the outer side of the cabling belting layer 2, and a heat insulation layer 5 is arranged on the outer side of the shielding layer 4; the heat insulation layer 5 consists of a first glass fiber cloth layer 501 on the inner layer, a second glass fiber cloth layer 503 on the outer layer and naturally dried calcium silicate 502; the outer side of the heat insulation layer 5 is extruded with an outer sheath layer 6, and the outer sheath layer 6 is made of halogen-free low-smoke polyethylene material.

According to the above embodiment, the fire-resistant mica tape 102 extruded outside the conductor 101 has excellent high temperature resistance and combustion resistance, and basically no harmful smoke volatilizes when the conductor is burnt by naked fire; flame-retardant fillers 3 are arranged in gaps between the plurality of wires 1 and the cabling wrapping band layer 2, so that the cable has strong flame-retardant performance; the calcium silicate 502 in the insulation layer 5 is a commonly used refractory material; the glass fiber cloth layer is inorganic fiber, is never burnt, has high tensile strength and length stability, and has excellent heat resistance, so the heat insulation layer 5 has stronger fire resistance, acid and alkali resistance and corrosion resistance; the outer sheath layer 6 is made of halogen-free low-smoke polyethylene material, and meets the requirement of environmental protection.

In order to provide the conductor 101 with fire-resistant properties, according to the above embodiment, in particular, referring to fig. 1, the number of wires 1 ranges from 2 to 61; the conductor 101 is made of an annealed tin-plated soft copper wire.

In order to provide the cable with the capability of shielding external electromagnetic signal interference, according to the above embodiment, specifically, referring to fig. 1, the shielding layer 4 is braided by using tinned copper wires, and the braiding coverage rate of the shielding layer 4 is not less than 85%.

In order to enhance the tensile mechanical property and corrosion resistance of the cable, according to the above embodiment, in particular, referring to fig. 1, an armor layer 7 is disposed outside the outer sheath layer 6; the armor layer 7 is a double-steel-tape armor layer.

In order to make the insulating layer 103 have the halogen-free and low-smoke characteristics, according to the above embodiment, specifically, referring to fig. 1, the insulating layer 103 is made of a cross-linked polyethylene material by extrusion.

In order to facilitate the cabling of the wires 1, a cabling tape layer 2 is arranged on the outer side of the wires 1, and according to the above embodiment, in particular, referring to fig. 1, the cabling tape layer 2 is made of a polyester tape.

In order to enhance the flame retardant performance of the cable, the cable is filled with a flame retardant filler 3, and according to the above embodiment, specifically, referring to fig. 1, the flame retardant filler 3 is a glass fiber rope; the glass fiber rope is an elastic glass fiber rope and has the characteristics of high temperature resistance, corrosion resistance and high strength.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a high fire-retardant low release does not have steamed low cigarette B1 level control cable, includes many wires (1), its characterized in that: the lead (1) sequentially comprises a conductor (101), a fire-resistant mica tape (102) and an insulating layer (103) from inside to outside; the outer sides of the leads (1) are provided with cabling belting layers (2); a flame-retardant filler (3) is arranged in a gap between the lead (1) and the cabling wrapping layer (2); a shielding layer (4) is arranged on the outer side of the cabling belting layer (2), and a heat insulation layer (5) is arranged on the outer side of the shielding layer (4); the heat insulation layer (5) comprises a first glass fiber cloth layer (501) arranged on the inner layer, a second glass fiber cloth layer (503) arranged on the outer layer and calcium silicate (502) arranged between the first glass fiber cloth layer (501) and the second glass fiber cloth layer (503); the outer side of the heat insulation layer (5) is extruded with an outer sheath layer (6), and the outer sheath layer (6) is made of halogen-free low-smoke polyethylene material.

2. The high flame retardant low release halogen free low smoke B1 grade control cable of claim 1, wherein: the number of the leads (1) ranges from 2 to 61; the conductor (101) is made of an annealed tinned soft copper wire.

3. The high flame retardant low release halogen free low smoke B1 grade control cable of claim 1, wherein: the shielding layer (4) is formed by weaving tinned copper wires, and the weaving coverage rate of the shielding layer (4) is not less than 85%.

4. The high flame retardant low release halogen free low smoke B1 grade control cable of claim 1, wherein: an armor layer (7) is arranged on the outer side of the outer sheath layer (6); the armor layer (7) is a double-steel-tape armor layer.

5. The high flame retardant low release halogen free low smoke B1 grade control cable of claim 1, wherein: the insulating layer (103) is made of cross-linked polyethylene materials in an extrusion wrapping mode.

6. The high flame retardant low release halogen free low smoke B1 grade control cable of claim 1, wherein: the cabling wrapping band layer (2) is made of a polyester band.

7. The high flame retardant low release halogen free low smoke B1 grade control cable of claim 1, wherein: the flame-retardant filler (3) is a glass fiber rope.