Long-life flame-retardant cable

Abstract

The utility model belongs to the field of cables for buildings, and provides a long-life flame-retardant cable, which comprises four conductive units and a cable core, the four conductive units are positioned at four corners of the cable core and surround the cable core, and the four conductive units and the cable core are nested in a compression layer; the center of the conductive unit is a conductive layer, the conductive layer adopts a compressed special-shaped structure conductor, and the conductor is of a tile circle and sector circle structure. According to the utility model, the conducting layer is in a compressed fan shape or a compressed tile shape, so that products are mutually complementary to form a circle when being twisted, and organic comburent of the products is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of building cables, and in particular relates to a long-life flame-retardant cable. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] Wires and cables are products used to transmit electrical energy or magnetic energy or to achieve electromagnetic energy conversion.

[0004] With the development of modern science and technology, the improvement of people's living standards, and the increasing complexity and high flexibility of industrial and commercial building structures, people are paying more and more attention to the safety and environmental protection of various wire and cable products for integrated wiring.

[0005] The inventor found that the existing low-smoke halogen-free flame-retardant cables are mainly round conductors, single-layer insulation, and the lining is mostly single-layer wrapping, and there is no wrapping layer after armoring. This structure can meet the ordinary flame retardancy, but the product structure cannot meet the B1 and long life requirements. With the long life requirements of nuclear power plants, urban rails, subways, hospitals and high-rise buildings, the B1 level is becoming more and more stringent. Utility Model Content

[0006] In order to solve the above problems, the utility model proposes a long-life flame-retardant cable. The conductive layer of the utility model adopts a compressed fan type or a compressed tile type, so that the products complement each other to form a circle when twisted, so that the organic combustion products of the product are reduced.

[0007] According to some embodiments, the utility model provides a long-life flame-retardant cable, which adopts the following technical solutions:

[0008] A long-life flame-retardant cable comprises four conductive units and a core, wherein the four conductive units are located at four corners of the core and surround the core, and the four conductive units and the core are nested in a compacting layer;

[0009] The center of the conductive unit is a conductive layer, the conductive layer adopts a compact special-shaped structure conductor, and the conductor shape is a wedge-shaped circle and a fan-shaped circle structure.

[0010] Furthermore, a fireproof layer is arranged outside the conductive layer, and the fireproof layer is formed by wrapping a forward and reverse twisted mica tape.

[0011] Furthermore, an insulating layer is arranged outside the fireproof layer, and the insulating layer adopts a double-layer co-extruded structure of heterogeneous materials.

[0012] Furthermore, the compression layer is formed by compressing a low-smoke halogen-free flame-retardant tape, and the center and side gaps are filled with highly flame-retardant inorganic paper ropes.

[0013] Furthermore, a first protective layer and a second protective layer are sequentially arranged outside the compression layer.

[0014] Furthermore, a metal layer is arranged outside the second protective layer, and the metal layer is armored with a metal tape.

[0015] Furthermore, a first protective layer and a second protective layer are sequentially arranged outside the metal layer;

[0016] The first protective layer is formed by wrapping with a high flame retardant tape.

[0017] Furthermore, the second protective layer is made of radiation cross-linked polyolefin and is extruded.

[0018] Furthermore, the conductor shape is a 90°-100° tile shape; or a 90°-180° fan shape.

[0019] Furthermore, the fireproof layer is a double-layer structure.

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] The utility model adopts a compact fan-shaped or compact tile-shaped conductive layer, so that the products complement each other to form a circle when twisted, so that the organic combustion products of the products are reduced. The cable fireproof layer adopts positive and negative twisting, so that the fireproof layers are more compact and there are fewer overlapping layers caused by the same direction.

[0022] The utility model cable insulation layer adopts a double-layer co-extruded material of heterogeneous materials, which makes the product's electrical performance and mechanical performance, low-smoke halogen-free flame retardant performance more excellent, and the product's internal insulation has excellent insulation performance, and the external insulation has excellent low-smoke halogen-free flame retardant performance. After the product is cross-linked by an electron accelerator, the linear structure of the insulating molecular structure product itself becomes a mesh structure, which greatly increases the product's service life to 80 years. While strengthening the electrical insulation performance of the cable, this structure also makes the cable insulation layer have good flame retardant performance, and the low-smoke halogen-free material will not release toxic gases when burning, which improves the survival rate of people trapped in the fire.

[0023] The utility model cable conductive layer adopts a special-shaped structure and then has a compacted layer wrapped with a low-smoke halogen-free flame retardant tape, which adds another layer of protection outside the insulating core. The cable metal layer can adopt a variety of structures, which can be replaced according to the actual use environment, such as copper belt, copper wire, steel belt, steel wire, etc. The metal layer is mainly considered to protect the internal core from external stress such as dragging and smashing when the product is on fire.

[0024] The utility model cable protective layer is a two-layer structure. The first layer is mainly used to isolate the heat from the metal layer in case of fire, destroying the protective ability of the metal layer. The second protective layer is mainly used to improve the low-smoke halogen-free flame retardant effect of the cable. After the product is irradiated, the molecular structure is changed to increase the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0026] Figure 1 This is a long-life flame-retardant cable structure diagram of the utility model;

[0027] In the figure:

[0028] 1. Conductive layer, 2. Fireproof layer, 3. Inner insulation layer, 4. Outer insulation layer, 5. Compression layer, 6. First protective layer, 7. Second protective layer, 8. Metal layer, 9. First protective layer, 10. Second protective layer. DETAILED DESCRIPTION

[0029] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0030] It should be noted that the following detailed descriptions are all exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0032] In the present utility model, terms such as "fixed connection", "connected", "connection", etc. should be understood in a broad sense, indicating that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. For relevant scientific research or technical personnel in this field, the specific meanings of the above terms in the present utility model can be determined according to specific circumstances, and they cannot be understood as limitations on the present utility model.

[0033] Embodiment 1

[0034] like Figure 1As shown, this embodiment provides a long-life flame-retardant cable, comprising four conductive units and a core, wherein the four conductive units are located at four corners of the core and surround the core, and the four conductive units and the core are nested in a compacting layer;

[0035] The center of the conductive unit is a conductive layer 1, and the conductive layer adopts a compact special-shaped structure conductor, and the conductor shape is a wedge-shaped circle and a fan-shaped circle structure.

[0036] A fireproof layer 2 is arranged outside the conductive layer. The fireproof layer is formed by wrapping a mica tape with forward and reverse twists, and the overlap of the mica tape is greater than 50%.

[0037] The fireproof layer 2 is provided with an insulating layer outside. The insulating layer adopts a double-layer co-extruded structure of heterogeneous materials. The inner insulating layer 3 adopts highly flame-retardant cross-linked polyethylene, and the outer insulating layer 4 adopts low-smoke halogen-free flame-retardant cross-linked polyolefin. The ratio of the inner and outer insulation is 1:3, and the electrical insulation layer needs to undergo a radiation cross-linking process. After the product is cross-linked by an electron accelerator, the linear structure of the insulating molecular structure product itself becomes a mesh structure.

[0038] The compressed layer 5 is compressed by low-smoke halogen-free flame-retardant tape, and the center and side gaps are filled with highly flame-retardant inorganic paper rope.

[0039] A first protective layer 6 and a second protective layer 7 are sequentially arranged outside the compression layer.

[0040] The first protective layer is made of ceramic silicone rubber, which has excellent fireproof, flame retardant, low smoke, non-toxic and other characteristics. The extrusion molding process is simple, and the residue after burning is a hard ceramic shell. The hard shell does not melt or drip in a fire environment, and can pass the line integrity test specified in GB / T19216.21-2003 at 950℃-1000℃, fire for 90 minutes, and cooling for 15 minutes. Ceramic silicone rubber products have no special requirements for equipment, and the processing technology is simple. They can be produced using traditional silicone rubber processing equipment. Compared with the current fire-resistant wire and cable production process, they have higher production efficiency and can reduce production energy consumption and save costs.

[0041] The second protective layer is an oxygen-isolating layer, which uses ceramicized polyolefin. Ceramicized polyolefin can quickly generate a complete ceramic shell under temperatures above 650°C or flame conditions. The bending strength can reach 10MPa, the dielectric strength is greater than 20kV / mm, and the volume resistivity is higher than 5×1013Ω·cm. The generated ceramic shell does not crack or drip. In addition to having excellent electrical isolation properties, it also has excellent oxygen and heat insulation effects. It can effectively isolate the high-temperature flame from invading the inside of the line, delay the decomposition of internal materials, avoid the conductor from melting in the flame, and ensure the smooth flow of the line in the event of a fire. In addition, this material uses ordinary polyolefin cable material processing equipment, is formed in one step, has a simple process, and can be produced continuously.

[0042] A metal layer 8 is arranged outside the second protective layer. The metal layer is armored with a metal belt, and the metal belt has the characteristics of anti-collision and high protection.

[0043] A first protective layer 9 and a second protective layer 10 are sequentially arranged outside the metal layer; the first protective layer is formed by wrapping with a high flame retardant tape, and the second protective layer is made of radiation cross-linked polyolefin and is extruded.

[0044] The cable adopts double-layer protective layer. The first layer is wrapped with 2 layers of high flame retardant tape, and the second layer is made of irradiated cross-linked polyolefin. The product has good flame retardant effect and high plasticity. The extrusion method adopts extrusion. The first protective layer protects the isolation effect of the metal layer and the outermost protective layer.

[0045] The first layer of the structure is mainly used to isolate the heat from the metal layer in case of fire, which would destroy the protective ability of the metal layer. The second protective layer is mainly used to improve the low-smoke, halogen-free flame retardant effect of the cable and increase the service life. The second protective layer is made of rat-proof, ant-proof and UV-proof materials. Even if the product environment is relatively harsh, the product can still be used. It will not release toxic gas during combustion, which is more environmentally friendly and has a longer service life.

[0046] Main implementation measures:

[0047] The conductive layer 1 of the product is wrapped with two layers of fireproof layer 2 in both directions by a wrapping machine, and then a double layer of heterogeneous insulation layer is extruded simultaneously by a special extruder, and then irradiated and cross-linked by a nano electron accelerator. The insulation layer is added with a compression layer 5 after passing through the cabling equipment, and then two layers of protective layers are extruded by the extrusion equipment respectively, and then the metal layer 8 is completed by the armoring equipment or braiding equipment, and then returned to the cabling equipment to wrap the first protective layer 9, and finally the second protective layer 10 is extruded by the extrusion equipment and then irradiated and cross-linked by a nano electron accelerator. Finally, this cable is formed.

[0048] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

[0049] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A long-life flame-retardant cable, characterized in that: It comprises four conductive units and a wire core, wherein the four conductive units are located at four corners of the wire core and surround the outside of the wire core, and the four conductive units and the wire core are nested in a compacting layer; The center of the conductive unit is a conductive layer, the conductive layer adopts a compact special-shaped structure conductor, and the conductor shape is a wedge-shaped circle and a fan-shaped circle structure.

2. A long-life flame-retardant cable according to claim 1, characterized in that: A fireproof layer is arranged outside the conductive layer, and the fireproof layer is formed by wrapping a forward and reverse twisted mica tape.

3. A long-life flame-retardant cable as claimed in claim 2, characterized in that: An insulating layer is arranged outside the fireproof layer, and the insulating layer adopts a double-layer co-extruded structure of heterogeneous materials.

4. A long-life flame-retardant cable according to claim 1, characterized in that: The compressed layer is compressed by low-smoke halogen-free flame-retardant tape, and the center and side gaps are filled with highly flame-retardant inorganic paper ropes.

5. The long-life flame-retardant cable according to claim 1, characterized in that: A first protective layer and a second protective layer are sequentially arranged outside the compression layer.

6. A long-life flame-retardant cable as claimed in claim 5, characterized in that: A metal layer is arranged outside the second protective layer, and the metal layer is armored with a metal tape.

7. A long-life flame-retardant cable as claimed in claim 6, characterized in that: A first protective layer and a second protective layer are sequentially arranged outside the metal layer; The first protective layer is formed by wrapping with a high flame retardant tape.

8. A long-life flame-retardant cable as claimed in claim 7, characterized in that: The second protective layer is made of radiation cross-linked polyolefin and is extruded.

9. The long-life flame-retardant cable according to claim 1, characterized in that: The conductor shape is a 90°-100° tile shape; or a 90°-180° fan shape.

10. The long-life flame-retardant cable according to claim 2, characterized in that: The fireproof layer is a double-layer structure.

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