Environment-friendly mineral insulated fireproof cable

Abstract

The utility model provides an environment-friendly mineral insulated fireproof cable, which comprises a plurality of wire cores, a protection layer group wrapping the periphery of each wire core, and a sheath layer wrapping the periphery of the protection layer group, and is characterized in that each wire core comprises a conductor and a fireproof layer wrapping the periphery of the conductor, and fluorophlogopite is selected as a main material of the fireproof layer, so that the fireproof performance of the cable is improved; a traditional mica material is replaced, and the thickness of the fireproof layer is designed, so that the porosity of the fireproof layer is reduced, the fireproof layer is not easy to absorb moisture, high insulation performance can be maintained in a humid use environment, the safety coefficient of the cable is improved, the surface of the fireproof layer is free of high-corrosion residues, the fireproof layer is not easy to be extruded by internal stress, and the service life of the cable is prolonged. The fireproof door has the advantages of being simple in structure, low in implementation cost and convenient to popularize and implement.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fireproof cable production, and particularly relates to an environment-friendly mineral insulation fireproof cable. BACKGROUND

[0002] In the prior art, the mineral insulation fireproof layer cable is a high-performance cable, and its main characteristics include excellent fire resistance, environmental protection, no pollution, high temperature resistance, corrosion resistance, stable electrical performance, and convenient installation and maintenance, etc. The cable is widely used in places with high fire safety requirements, such as high-rise buildings, subways, tunnels, power plants, nuclear power plants, important engineering facilities, high-rise buildings, intelligent communities, large supermarkets, and places with high environmental protection requirements and long-term stable operation in high-temperature environments and densely populated places.

[0003] In the prior art, the traditional mineral insulation fireproof layer cable usually only wraps mica tape around the outer periphery of the core to improve the fireproof performance of the cable, and the mica tape is usually a 5450-1 organic silicon glass powder mica tape, a 5453-1 diphenyl ether glass powder mica tape, or a 556-1 polyimide film single-sided composite mica tape. These mica tapes do not contain fluorine elements and have high porosity, which is easy to absorb moisture. In a humid use environment, the insulation of the cable can be reduced, reducing the safety factor of the cable. In addition, the commonly used double-sided synthetic mica tape on the market can produce residues with high corrosiveness, such as a mixture of CaO and CaCl2, which can cause the mica tape to be extruded by internal stress, affecting its fire resistance and reducing the fire safety of the cable in a fire situation. Therefore, there is an urgent need for improvement. CONTENT OF THE UTILITY MODEL

[0004] The application is proposed to solve the technical problems in the prior art that the traditional fireproof cable usually only wraps mica tape around the outer periphery of the core to improve the fireproof performance of the cable. On the one hand, the commonly used mica tape does not contain fluorine elements and has high porosity, which is easy to absorb moisture. In a humid use environment, the insulation of the cable can be reduced, reducing the safety factor of the cable. On the other hand, the commonly used mica tape on the market can produce residues with high corrosiveness, such as a mixture of CaO and CaCl2, which can cause the mica tape to be extruded by internal stress, affecting its fire resistance and reducing the fire safety of the cable in a fire situation. Therefore, there is an urgent need for improvement.

[0005] The application adopts the following scheme: an environment-friendly mineral insulation fireproof cable, which comprises a plurality of cores, a protective layer group wrapped on the outer periphery of each core, and a sheath layer wrapped on the outer periphery of the protective layer group. The core comprises a conductor and a fireproof layer wrapped on the outer periphery of the conductor. The material of the fireproof layer is fluorophlogopite, and the thickness of the fluorophlogopite is 0.05mm-0.1mm.

[0006] In some possible embodiments, the conductor is formed by twisting N conductor wires, the conductor wires are made of the second type of copper conductor, and N is an integer in the range from 2 to 30.

[0007] In some possible embodiments, the conductor wires have a cross-sectional diameter of 0.5 mm to 1.2 mm.

[0008] In some possible embodiments, the core is provided with M strands, and M is an even integer in the range from 4 to 10.

[0009] In some possible embodiments, the M strands are filled with a filling layer, and the filling layer is made of inorganic fibers.

[0010] In some possible embodiments, the filling layer is made of any one of boron fibers, ceramic fibers, quartz fibers, alumina fibers, and aluminum silicate fibers.

[0011] In some possible embodiments, the protective layer group includes an inner protective layer wrapped around the outer periphery of each fireproof layer, and an outer protective layer wrapped around the outer periphery of the inner protective layer, the thickness of the outer protective layer is 2 to 5 times the thickness of the inner protective layer, and the sheath layer is wrapped around the outer periphery of the outer protective layer.

[0012] In some possible embodiments, the inner protective layer is made of halogen-free cross-linked polyolefin, and the outer protective layer is made of halogen-free silicone ceramic glue.

[0013] In some possible embodiments, the sheath layer includes an inner sheath layer wrapped around the outer periphery of the outer protective layer and an outer sheath layer wrapped around the outer periphery of the inner sheath layer, and the thickness of the outer sheath layer is 1.5 to 3.3 times the thickness of the inner sheath layer.

[0014] In some possible embodiments, the inner sheath layer is made of any one of red copper, brass, and phosphor copper, and the outer sheath layer is made of thermoplastic polyurethane.

[0015] Compared with the prior art, the application has the following beneficial effects:

[0016] This application provides an environmentally friendly mineral-insulated fire-resistant cable, which includes multiple conductors, a protective layer group covering the outer periphery of each conductor, and a sheath layer covering the outer periphery of the protective layer group. The conductors include conductors and a fire-resistant layer covering the outer periphery of the conductors. By selecting fluorophlogopite as the main material of the fire-resistant layer instead of traditional mica, and by designing its thickness, the porosity of the fire-resistant layer is reduced, making it less prone to moisture absorption. It can maintain high insulation performance in humid environments, improving the safety factor of the cable. Furthermore, the surface of the fire-resistant layer is free of highly corrosive residues, and the fire-resistant layer itself is not easily subjected to internal stress compression, ensuring its fire resistance performance. It has the advantages of simple structure, low implementation cost, and ease of promotion and implementation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the cross-sectional structure of an environmentally friendly mineral-insulated fireproof cable according to this application;

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of an environmentally friendly mineral-insulated fireproof cable according to this application. Detailed Implementation

[0019] Combination Figures 1-2 The content shown further illustrates the technical solution provided in this application: an environmentally friendly mineral-insulated fireproof cable, comprising multiple conductors 1, a protective layer group 2 covering the outer periphery of each conductor 1, and a sheath layer 3 covering the outer periphery of the protective layer group 2. Each conductor 1 includes a conductor 10 and a fireproof layer 11 covering the outer periphery of the conductor 10. The fireproof layer 11 is made of fluorophlogopite, and the thickness of the fluorophlogopite is 0.05mm-0.1mm.

[0020] In actual implementation, the fireproof layer is made of fluorophlogopite mica tape. This mica tape uses fluoride ions instead of hydrocarbon groups, contains no water of crystallization, has a melting point of 1375℃, a high safety factor, and is non-toxic and smokeless after combustion. In addition to having the characteristics of natural mica tape, namely low coefficient of expansion, high dielectric strength, high resistivity, and uniform dielectric constant, it also has the characteristics of high heat resistance, which fully meets the requirements for the use of flame-retardant cables at 950-1000℃.

[0021] In actual implementation, fluorophlogopite with a thickness of 0.08 mm was selected as the fireproof layer.

[0022] The application provides an environment-friendly mineral insulated fireproof cable, which comprises a plurality of cores, a protection layer group wrapped on the outer periphery of each core, and a sheath layer wrapped on the outer periphery of the protection layer group, wherein the core comprises a conductor and a fireproof layer wrapped on the outer periphery of the conductor. By selecting fluorine mica as the main material of the fireproof layer to replace the traditional mica material, and by designing the thickness of the fireproof layer to reduce the porosity of the fireproof layer and make the fireproof layer not easy to absorb moisture, the fireproof layer can maintain high insulation performance in a humid use environment, improve the safety factor of the cable, and the surface of the fireproof layer has no highly corrosive residues, and the fireproof layer itself is not easy to be extruded by internal stress, thereby ensuring the fireproof performance of the fireproof layer. The application has the advantages of simple structure, low implementation cost, and easy popularization and implementation.

[0023] In the implementation process of the embodiment, the conductor 10 is twisted by N conductor single wires, the material of the conductor single wire is the second type of copper conductor, the value range of N is a positive integer of 2-30, and exemplarily, the value of N is 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, and the like.

[0024] In the implementation process of the embodiment, the cross-sectional diameter of the conductor single wire is 0.5mm-1.2mm.

[0025] In the actual implementation process, the cross-sectional diameter of the conductor single wire is 0.7mm.

[0026] In the implementation process of the embodiment, the core 1 is provided with M strands, and the value range of M is a positive even number of 4-10, and exemplarily, the value of M is 4, 5, 8, 10.

[0027] Further, the value of M is 4.

[0028] In the implementation process of the embodiment, the core 1 is provided with M strands, and the value range of M is a positive even number of 4-10, and exemplarily, the value of M is 4, 5, 8, 10.

[0029] In the implementation process of the embodiment, the material of the filling layer 4 is any one of boron fiber, ceramic fiber, quartz fiber, aluminum oxide fiber and aluminum silicate fiber.

[0030] In the actual implementation process, the inorganic fiber is used as the filling layer, and the filling layer has the characteristics of high temperature resistance, softness, light density, high strength, and the like, does not contain harmful substances such as halogen, asbestos and glass fiber, has a small smoke emission amount when burning, and the volatile substances are non-toxic, thereby meeting the requirements of environmental protection and flame retardation.

[0031] In the implementation process of the embodiment, the protective layer group 2 includes an inner protective layer 20 wrapped on the outer periphery of each fireproof layer 11, and an outer protective layer 21 wrapped on the outer periphery of the inner protective layer 20, the thickness of the outer protective layer 21 is 2-5 times the thickness of the inner protective layer 20, and the sheath layer 3 is wrapped on the outer periphery of the outer protective layer 21.

[0032] In the implementation process of the embodiment, the material of the inner protective layer 20 is halogen-free cross-linked polyolefin, and the material of the outer protective layer 21 is halogen-free silicon ceramic glue.

[0033] In actual implementation, the halogen-free silicon ceramic glue material is compounded by taking silicon ceramic glue as a base material and carrier, adding inorganic nano silicon powder fireproof filler, ceramicization additives and various additives, and through kneading and mixing, a glue material for die pressing or extrusion molding is prepared, wherein the silicon ceramic glue matrix mainly guarantees the mechanical properties and process processing properties of the composite material; the ceramicization additives and the fireproof filler ensure that the silicon ceramic glue matrix does not fall off during combustion. When a fire occurs, the high-temperature flame makes the residual ash of the silicon ceramic glue after combustion form an insulating fire-resistant ceramic layer with certain mechanical strength, which can isolate the transmission and spread of flame and heat to the inside of the cable, effectively protect the electrical properties of the insulating core inside the ceramic layer, and ensure that the line can work normally under fire conditions. In production, an extrusion mold is used to fill the halogen-free flame-retardant material containing a large amount of hydrated oxide into the core gap, and the hydrated oxide absorbs a large amount of heat in the surrounding air when it burns, reducing the temperature of the cable surface; the released water molecules also absorb a large amount of heat, and the water vapor formed can dilute the oxygen concentration around the cable. It starts to harden at 350°C and above, and can reach up to 3000°C. As the temperature rises, it is quickly burned into a complete ceramic hard shell, the longer the ablation time and the higher the temperature, the harder and more solid the shell.

[0034] In the implementation process of the embodiment, the sheath layer 3 includes an inner sheath layer 30 wrapped on the outer periphery of the outer protective layer 21 and an outer sheath layer 31 wrapped on the outer periphery of the inner sheath layer 30, and the thickness of the outer sheath layer 31 is 1.5-3.3 times the thickness of the inner sheath layer 30.

[0035] In the implementation process of the embodiment, the material of the inner sheath layer 30 is any one of red copper, brass, and phosphor copper, and the material of the outer sheath layer 31 is thermoplastic polyurethane.

[0036] In actual implementation, the material of the inner sheath layer is brass, and the melting points of the copper sheath and the copper core are high, so that the cable can keep normal work under fire conditions and will not cause fire or spread fire; the copper sheath has good waterproofness and corrosion resistance, and can be used in humid or chemically corrosive environment for a long time without additional protection measures; the copper sheath can prevent electromagnetic interference as a shielding layer, and ensure that the signal transmission of the cable is not disturbed by external electromagnetic fields; the copper sheath itself can be used as a grounding wire, reducing the need for additional grounding wires and reducing installation complexity.

[0037] As shown in Figure 2 The outer sheath layer can be set according to actual use requirements.

[0038] The application provides an environment-friendly mineral insulated fireproof cable, which comprises a plurality of cores, a protection layer group wrapped on the outer periphery of each core, and a sheath layer wrapped on the outer periphery of the protection layer group, wherein the core comprises a conductor and a fireproof layer wrapped on the outer periphery of the conductor; by selecting fluorine phlogopite as the main material of the fireproof layer instead of traditional mica material, and by designing the thickness of the fireproof layer, the porosity of the fireproof layer is reduced, the fireproof layer is not easy to absorb moisture, the fireproof layer can keep high insulation performance in a humid use environment, the safety factor of the cable is improved, there is no high corrosive residue on the surface of the fireproof layer, the fireproof layer is not easy to be extruded by internal stress, the fireproof performance of the fireproof layer is ensured, the fireproof cable has the advantages of simple structure, low implementation cost and easy popularization and implementation.

[0039] The above is only an embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An environmentally friendly mineral insulated fireproof cable, characterized in that, The application relates to a wire, which comprises a plurality of wire cores (1), a protective layer group (2) covering the periphery of each wire core (1), and a sheath layer (3) covering the periphery of the protective layer group (2), wherein the wire core (1) comprises a conductor (10) and a fireproof layer (11) covering the periphery of the conductor (10), and the fireproof layer (11) is made of fluorophlogopite, and the thickness of the fluorophlogopite is 0.05-0.1 mm.

2. The environmentally friendly mineral insulated fire resistant cable according to claim 1, characterized in that, The conductor (10) is formed by twisting N conductor single wires, the conductor single wire is made of a second type of copper conductor, and N is a positive integer in the range of 2-30.

3. The environmentally friendly mineral insulated fire resistant cable of claim 2, wherein, The cross-sectional diameter of the conductor single wire is 0.5-1.2 mm.

4. The environmentally friendly mineral insulated fire resistant cable of claim 1, wherein, The wire core (1) is provided with M strands, and M is a positive even number in the range of 4-10.

5. The environmentally friendly mineral insulated fire resistant cable of claim 4, wherein the mineral insulation is a mixture of magnesium oxide and aluminum hydroxide. 5 The M strands of the wire core (1) are filled with a filling layer (4) made of inorganic fibers.

6. The environmentally friendly mineral insulated fire resistant cable of claim 5, wherein, The filling layer (4) is made of any one of boron fibers, ceramic fibers, quartz fibers, alumina fibers and aluminum silicate fibers.

7. The environmentally friendly mineral insulated fire resistant cable of claim 1, wherein the mineral insulation is a mixture of magnesium oxide and aluminum oxide. The protective layer group (2) comprises an inner protective layer (20) covering the periphery of each fireproof layer (11), and an outer protective layer (21) covering the periphery of the inner protective layer (20), the thickness of the outer protective layer (21) is 2-5 times the thickness of the inner protective layer (20), and the sheath layer (3) covers the periphery of the outer protective layer (21).

8. The environmentally friendly mineral insulated fire resistant cable of claim 7, wherein, The inner protective layer (20) is made of halogen-free cross-linked polyolefin, and the outer protective layer (21) is made of halogen-free silicon ceramic glue.

9. The environmentally friendly mineral insulated fire resistant cable of claim 7, wherein, The sheath layer (3) comprises an inner sheath layer (30) covering the periphery of the outer protective layer (21) and an outer sheath layer (31) covering the periphery of the inner sheath layer (30), and the thickness of the outer sheath layer (31) is 1.5-3.3 times the thickness of the inner sheath layer (30).

10. The environmentally friendly mineral insulated fire resistant cable of claim 9, wherein, The inner sheath layer (30) is made of any one of red copper, brass and phosphor copper, and the outer sheath layer (31) is made of thermoplastic polyurethane.

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