Low-smoke halogen-free flame-retardant fireproof cable

Abstract

The utility model discloses a low-smoke halogen-free flame-retardant fire-resistant cable, which comprises a plurality of cable cores, a mica tape arranged outside the plurality of cable cores, an inner sheath arranged outside the mica tape, a plurality of circular cavities arranged on the inner sheath, ABC powder filled in the circular cavities, a shielding layer arranged outside the inner sheath, and an explosion-proof layer arranged outside the shielding layer. A plurality of tensile elements are arranged in the explosion-proof layer along the axial direction, and a fireproof layer, an armor layer and an outer sheath are sequentially arranged outside the explosion-proof layer. The ABC dry powder is filled in the inner sheath and forms a glassy covering layer under the action of high temperature, so that oxygen is isolated, and fire is extinguished by suffocation. According to the utility model, the fire-resistant layer is filled with the deoxidizer powder, and the oxygen absorbent powder can absorb a large amount of oxygen so as to inhibit combustion, so that dangers such as explosion caused by combustion can be effectively prevented, and the operation risk of the wire cable is reduced.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, specifically to a low-smoke, halogen-free, flame-retardant, and fire-resistant cable. Background Technology

[0002] Low-smoke halogen-free flame-retardant fire-resistant cables are a high-performance cable type, specifically designed to improve fire safety and environmental protection standards. Existing low-smoke halogen-free flame-retardant fire-resistant cables, when used, exhibit poor resistance to fracture during combustion and inadequate low-smoke, low-halogen, and low-toxicity properties after combustion. Furthermore, conventional cable structures cannot meet the increasingly stringent operational requirements for flame-retardant, fire-resistant, and reliable electrical wires and cables. Therefore, to address the problems of existing cables, a low-smoke halogen-free flame-retardant fire-resistant cable is proposed. Summary of the Invention

[0003] To address the aforementioned shortcomings of existing technologies, this utility model provides a low-smoke, halogen-free, flame-retardant, and fire-resistant cable.

[0004] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows: It includes several cable cores, each with a mica tape wound around its outer surface. An inner sheath is provided outside the mica tape. Several circular cavities are arranged along the axial direction on the inner sheath, and each circular cavity is filled with ABC powder. A shielding layer is provided outside the inner sheath, and an explosion-proof layer is provided outside the shielding layer. Several tensile elements are arranged along the axial direction inside the explosion-proof layer. A fire-resistant layer is provided outside the explosion-proof layer, and an armor layer is provided outside the fire-resistant layer. An outer sheath is provided outside the armor layer.

[0005] Furthermore, the refractory layer includes several arc-shaped support blocks, which are evenly distributed between the explosion-proof layer and the armored layer. These support blocks, together with the explosion-proof layer and the armored layer, form several deoxidizer cavities, each of which is filled with deoxidizer powder.

[0006] Furthermore, the cable core includes a conductor and an insulation layer disposed on the outside of the conductor, the insulation layer being made of ceramicized polyolefin material.

[0007] Furthermore, the cable core is provided in four places, and the cross-section of each cable core is a quarter circle.

[0008] Furthermore, the tensile element is a steel wire rope or aramid fiber.

[0009] Furthermore, flame-retardant wrapping tape is wrapped around the outside of the refractory layer, and the flame-retardant wrapping tape is located between the refractory layer and the armor layer.

[0010] Furthermore, both the inner and outer sheaths are made of low-smoke, halogen-free, flame-retardant, irradiated cross-linked polyolefin material.

[0011] Furthermore, the surface of the outer sheath is provided with a flame-retardant coating layer, which is epoxy resin.

[0012] Furthermore, an inner sealing plug and an outer sealing plug are respectively provided at both ends of the circular cavity.

[0013] Furthermore, the support block is made of rubber.

[0014] The beneficial effects of this utility model are as follows:

[0015] The inner sheath of this utility model has a circular cavity filled with ABC dry powder. The ABC dry powder is composed of ammonium phosphate. The flame retardant principle of ammonium phosphate dry powder is that the powder falls on the surface of the combustible material, undergoes a chemical reaction, and forms a glassy covering layer under high temperature, thereby isolating oxygen and suffocating the fire.

[0016] The explosion-proof layer of this utility model is provided with several tensile elements, which are made of steel wire rope and aramid fiber. These tensile elements can prevent the cable from being overly concentrated in one place when bearing load, thereby ensuring the safety of the structure. The explosion-proof layer is made of low-smoke halogen-free polyurethane material.

[0017] The fire-resistant layer of this invention is provided with an arc-shaped support block made of rubber. The gaps between the support blocks are filled with deoxidizer powder. The arc-shaped support block made of rubber can support the outer wall of the cable. When the cable is bent, the cavity of the silicone can reduce the pressure on the cable core. At the same time, the oxygen absorber powder filled in the gaps of the support block can absorb a large amount of oxygen, thereby inhibiting combustion and effectively preventing dangers such as explosions caused by combustion, thus reducing the operational risks of wires and cables.

[0018] The insulation layer, inner sheath, and outer sheath of this utility model are made of low-smoke halogen-free flame-retardant irradiated cross-linked polyolefin, and flame-retardant coating is sprayed on the surface of the outer sheath, which improves the service life of the cable.

[0019] The cable core structure of this invention is designed in a fan shape to improve the overall strength of the cable. Compared with the structure of multiple round wire cores twisted together to form a cable, the strength is greatly enhanced. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] The symbols for each component are as follows:

[0022] 1. Conductor; 2. Insulation; 3. Mica tape; 4. ABC dry powder; 5. Inner sheath; 6. Shielding layer; 7. Explosion-proof layer; 8. Tensile element; 9. Deoxidizer; 10. Support block; 11. Armoring layer; 12. Outer sheath; 13. Flame-retardant wrapping tape. Detailed Implementation

[0023] The specific embodiments of this utility model are described below to enable those skilled in the art to understand this utility model. However, it should be understood that this utility model is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of this utility model as defined and determined by the appended claims, these changes are obvious. All utility model creations utilizing the concept of this utility model are within the scope of protection.

[0024] like Figure 1 As shown, the low-smoke halogen-free flame-retardant fire-resistant cable includes several cable cores. Mica tape 3 is wound around the outside of each cable core. An inner sheath 5 is installed outside the mica tape 3. Several circular cavities are arranged along the axial direction on the inner sheath 5, and each circular cavity is filled with ABC powder 4. A shielding layer 6 is installed outside the inner sheath 5. An explosion-proof layer 7 is installed outside the shielding layer 6. Several tensile elements 8 are arranged along the axial direction inside the explosion-proof layer 7. A fire-resistant layer is installed outside the explosion-proof layer 7. An armor layer 11 is installed outside the fire-resistant layer. An outer sheath 12 is installed outside the armor layer 11.

[0025] The fire-resistant layer includes several arc-shaped support blocks 10, which are evenly distributed between the explosion-proof layer 7 and the armor layer 11. The support blocks 10, together with the explosion-proof layer 7 and the armor layer 11, form several deoxidizer cavities, and each deoxidizer cavity is filled with deoxidizer powder 9.

[0026] ABC dry powder 4 is composed of ammonium phosphate. The flame retardant principle of ammonium phosphate dry powder is that the powder falls on the surface of the combustible material, undergoes a chemical reaction, and forms a glassy covering layer under high temperature, thereby isolating oxygen and suffocating the fire.

[0027] In this embodiment, the cable core includes a conductor 1 and an insulation layer 2 disposed outside the conductor 1. The insulation layer 2 is made of ceramicized polyolefin material. The cable core is located in four places, and the cross-section of each cable core is fan-shaped, with each core having a quarter-circle cross-section. This fan-shaped cable core structure improves the overall strength of the cable, significantly enhancing its strength compared to a cable structure composed of multiple strands of round wire twisted together.

[0028] In this embodiment, the tensile element 8 is a steel wire rope or aramid fiber. The tensile element 8 can prevent the cable from being overly concentrated in one place when bearing load, thereby ensuring the safety of the structure. The explosion-proof layer is made of low-smoke halogen-free polyurethane material.

[0029] In this embodiment, a flame-retardant wrapping tape 13 is wrapped around the outside of the refractory layer, and the flame-retardant wrapping tape 13 is located between the refractory layer and the armor layer 11. The flame-retardant wrapping tape 13 can play a good flame-retardant role, thereby protecting the flame inside the flame-retardant wrapping tape 13.

[0030] Both the inner sheath 5 and the outer sheath 12 are made of low-smoke, halogen-free, flame-retardant, irradiated cross-linked polyolefin. The insulation layer 2, the inner sheath 4, and the outer sheath 12 are made of similar materials, using a composite material of halogen-free polyolefin and inorganic flame retardants. The inorganic flame retardants used are aluminum hydroxide, magnesium hydroxide, etc. At the same time, a flame-retardant coating is sprayed on the surface of the outer sheath, which improves the service life of the cable.

[0031] In this embodiment, the surface of the outer sheath 12 is provided with a flame-retardant coating layer, which is epoxy resin. The flame-retardant coating layer can effectively improve the flame-retardant effect of the outer sheath 12.

[0032] In this embodiment, an inner sealing plug and an outer sealing plug are respectively provided at both ends of the circular cavity. Through the cooperation of the inner sealing plug, the outer sealing plug and the circular cavity, a chamber for containing ABC dry powder 4 is formed.

[0033] In this embodiment, the support block 10 is made of rubber, and its cross-section is tile-shaped. The rubber support block 10 can support the outer wall of the cable. When the cable is bent, the deoxidizer chamber can reduce the pressure on the cable core. At the same time, the oxygen absorber powder filled in the deoxidizer chamber can absorb a large amount of oxygen, thereby inhibiting combustion and effectively preventing dangers such as explosions caused by combustion, thus reducing the operational risks of wires and cables.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A low-smoke, halogen-free, flame-retardant, fire-resistant cable, characterized in that, The cable includes several cable cores, with mica tape (3) wrapped around the outside of the cable cores. An inner sheath (5) is provided outside the mica tape (3). Several circular cavities are provided along the axial direction on the inner sheath (5). Each of the circular cavities is filled with ABC powder (4). A shielding layer (6) is provided outside the inner sheath (5). An explosion-proof layer (7) is provided outside the shielding layer (6). Several tensile elements (8) are provided along the axial direction inside the explosion-proof layer (7). A fire-resistant layer is provided outside the explosion-proof layer (7). An armor layer (11) is provided outside the fire-resistant layer. An outer sheath (12) is provided outside the armor layer (11).

2. The low-smoke halogen-free flame-retardant fire-resistant cable according to claim 1, characterized in that, The fire-resistant layer includes several arc-shaped support blocks (10), which are evenly distributed between the explosion-proof layer (7) and the armor layer (11). The support blocks (10), the explosion-proof layer (7), and the armor layer (11) form several deoxidizer cavities, and each deoxidizer cavity is filled with deoxidizer powder (9).

3. The low-smoke halogen-free flame-retardant fire-resistant cable according to claim 2, characterized in that, The cable core includes a conductor (1) and an insulation layer (2) disposed outside the conductor (1), the insulation layer (2) being made of ceramicized polyolefin material.

4. The low-smoke halogen-free flame-retardant fire-resistant cable according to claim 3, characterized in that, The cable core is provided in four locations, and the cross-section of each cable core is a quarter circle.

5. The low-smoke halogen-free flame-retardant fire-resistant cable according to claim 1, characterized in that, The tensile element (8) is a steel wire rope or aramid fiber.

6. The low-smoke halogen-free flame-retardant fire-resistant cable according to claim 1, characterized in that, The fire-resistant layer is wrapped with a flame-retardant wrapping tape (13), which is located between the fire-resistant layer and the armor layer (11).

7. The low-smoke halogen-free flame-retardant fire-resistant cable according to claim 1, characterized in that, Both the inner sheath (5) and the outer sheath (12) are made of low-smoke, halogen-free, flame-retardant, irradiated cross-linked polyolefin material.

8. The low-smoke halogen-free flame-retardant fire-resistant cable according to claim 1, characterized in that, The outer sheath (12) is provided with a flame-retardant coating layer, which is epoxy resin.

9. The low-smoke halogen-free flame-retardant fire-resistant cable according to claim 1, characterized in that, The circular cavity is provided with an inner sealing plug and an outer sealing plug at its two ends, respectively.

10. The low-smoke halogen-free flame-retardant fire-resistant cable according to claim 2, characterized in that, The support block (10) is made of rubber.

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