Halogen-free low-smoke B1-level fireproof high-shielding flexible cable for security and protection

Abstract

The utility model discloses a halogen-free low-smoke B1-level fire-resistant high-shielding flexible cable for security and protection. The halogen-free low-smoke B1-level fire-resistant high-shielding flexible cable is sequentially provided with a flexible conductor (1), a fire-resistant layer (2), an insulating layer (3), a mineral filling rope (4), an isolating layer (5), a metal shielding layer (6), a flame-retardant oxygen barrier layer (7) and a halogen-free low-smoke flame-retardant B1-level outer protective layer (8) from the inner layer to the outer layer. The utility model has the advantages that: on the premise that the combustion performance of the B1-level cable is ensured, the high-shielding characteristic and the fire-resistant characteristic of the cable are synchronously increased, and the shielding performance, the bending frequency, the service life and the construction convenience of the cable can be greatly improved; when a fire disaster happens, the electric energy and signal transmission time of the cable can be effectively prolonged, precious time is provided for escape and rescue, the reliability and safety of a using system are greatly improved, and the characteristics of safety and environmental protection are truly achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, and particularly to a halogen-free low-smoke B1-class fire-resistant high-shielding flexible cable for security protection. Background Art

[0002] The GB 51348-2019 "Electrical Design Standard for Civil Buildings" implemented on August 1, 2020 has made clear regulations on the combustion performance of wires and cables and the selection of usage places. Among them, Article 8.9.1 stipulates that fire-resistant cables should have a non-lower than B1-class flame-retardant performance; Article 13.8.4 stipulates that the alarm bus of the fire automatic alarm system adopted in the evacuation passage of crowded places should select wires and cables with a combustion performance of B1 class; Article 13.9.1 stipulates that for wires and cables laid openly in public buildings with a building height exceeding 100m and refuge floors, the combustion performance grade should not be lower than B1 class; financial buildings, provincial power dispatching buildings, provincial and municipal radio and television, telecommunications buildings and crowded public places in high-rise buildings of Class I should also select B1-class wires and cables.

[0003] In the face of a complex and harsh working environment, B1-class cables often have a series of unstable factors. For example, when a fire occurs, the wires cannot work properly after encountering high temperatures. Adding a fire-resistant layer can effectively extend the working time of the cables and increase the chance of escape for personnel. When installing, repairing or using wires, the wires will be dragged, so the flexibility requirement for the wires is increased, the bending performance of the cables is enhanced, which is convenient for construction and can extend the service life of the wires. The cable information transmission is easily interfered by the outside world, causing electrical signal interruption or even short circuit, resulting in damage to electrical equipment. When installing, repairing or using some cables, the cables will be dragged, so the flexibility requirement for the cables is increased, and the bending performance of the cables is enhanced to extend the service life. That is, the bending property, shielding property and fire resistance of the existing security protection cables need to be improved. This puts forward higher requirements for B1-class cables.

[0004] Therefore, it is particularly important to solve the problems of the bending property, fire resistance and shielding property of B1 cables. Summary of the Invention

[0005] In order to overcome the deficiencies of the above-mentioned prior art, the utility model provides a fire-resistant B1-class shielding flexible cable for the security protection field. Compared with ordinary B1-class cables, the bending times and service life of the cable are greatly improved, and it is also convenient for pipe threading construction; and on the premise of ensuring compliance with the combustion performance of B1-class cables, the cable can continue to operate stably for a certain period of time in the event of a fire, which not only increases the chance of escape for personnel, but also extends the power transmission time of the cable, effectively enhancing the fire-resistant and flame-retardant performance and shielding characteristics of the cable.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A halogen-free low-smoke B1-level fire-resistant high-shielding flexible cable for security protection, comprising: a cable core, which is formed by stranding multiple insulated wire cores, and a mineral filling rope 4 is filled in the stranding gap thereof; the insulated wire cores are, from the inner layer to the outer layer, a soft conductor 1, a fire-resistant layer 2, and an insulating layer 3 in sequence; an isolation layer 5, a metal shielding layer 6, a flame-retardant oxygen barrier layer 7, and a halogen-free low-smoke flame-retardant B1-level outer sheath 8 are arranged on the outer layer of the cable core in sequence.

[0008] After adopting the above technical solution, the utility model has the following advantages: For the cable adopting the technical solution of the utility model, on the premise of ensuring compliance with the combustion performance of B1-level cables, the soft conductor adopted has a softer characteristic compared with the conductors in ordinary B1-level cables, which can not only greatly increase the bending times and service life of the cable, but also facilitate pipe threading construction; the adopted multi-layer composite material flame-retardant protection layer structure enables the cable to continue to operate stably for a certain period of time in the event of a fire, which not only increases the chance of personnel escape, but also extends the power transmission time of the cable, effectively enhancing the fire-resistant performance of the cable; the adopted metal shielding layer improves the shielding characteristic of the cable.

[0009] Further, the soft conductor 1 adopts the Class 6 conductor in GB / T 3956-2008. The soft conductor adopts the 6th type of copper conductor that meets GB / T 3956-2008, and its beneficial effect is that it has a softer characteristic compared with the 1st, 2nd, and 5th type conductors in ordinary B1-level cables, increasing the bending performance of the B1-level cable, not being easily damaged, and effectively extending the service life of the cable.

[0010] Further, the fire-resistant layer 2 is a structure of two layers of calcined mica tape wound, and the winding direction is opposite to the conductor stranding direction. Its beneficial effect is that the softness of the two-layer calcined mica tape material is convenient for winding, and it does not contain fluorine or halogen, does not produce thick smoke and carbon deposits when burning, is extremely environmentally friendly, and at the same time forms a dense conductor protection outer shell insulator at high temperature, which not only ensures the softness of the fire-resistant layer, but also further improves its temperature resistance level, effectively extending the power and signal transmission time of the cable and enhancing its fire-resistant performance.

[0011] Further, the insulating layer 3 is extruded from an environmentally friendly low-smoke halogen-free flame-retardant cross-linked polyolefin material. Its beneficial effect is that after cross-linking, this material changes linear molecules into network molecules, increasing the temperature resistance level of the insulating material, and the physical and electrical properties of its insulation also change, and the service life of the product will be correspondingly extended.

[0012] Further, the mineral filling rope 4 is made of a non-hygroscopic and environmentally friendly material with flame retardant properties. The mineral filling rope environmental protection flame retardant material is used to replace the ordinary rock wool rope filling in the stranding gap. The beneficial effect is that this material has the characteristics of non-combustion and flame retardancy. It not only does not harm the health of employees during production, but also can be naturally decomposed when discarded, without generating a large amount of pollutants. The material specific gravity is also relatively low, and it has more cost advantages.

[0013] Further, the isolation layer 5 is formed by overlapping winding with a non-hygroscopic wrapping material, and the winding overlap rate is not less than 30%.

[0014] Further, the metal shielding layer 6 uses oxygen-free copper single wires with a wire diameter of more than 0.1 mm. A plurality of the single wires are stranded together and then braided for shielding, and the braiding density is not less than 85%. The beneficial effect is that using a metal shielding layer with a braiding density of more than 85%, which is higher than the national standard, can more effectively protect the signal transmission, make the signal transmission immune to the influence of the external environment, and better meet the requirements of transmission performance.

[0015] Further, the flame retardant oxygen barrier layer 7 is formed by overlapping winding with a halogen-free low-smoke and high-flame retardant tape, and its oxygen index is not less than 65, and the winding overlap rate is not less than 30%.

[0016] Further, the halogen-free low-smoke and high-flame retardant tape is set to be composed of polyester yarn and glass fiber yarn. The beneficial effect is that it enhances the flame retardant characteristics of the cable, further protects the insulated conductor cores, and at the same time the flame retardant oxygen barrier layer can also prevent the outer sheath from being damaged by the metal shielding layer.

[0017] Further, the halogen-free low-smoke flame retardant B1-class outer sheath 8 is extruded with a halogen-free low-smoke flame retardant B1-class environmentally friendly polyolefin material. The beneficial effect is that this material further improves the reliability and safety of the cable on the premise of meeting the B1-class combustion requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following further describes the present invention with reference to the accompanying drawings:

[0019] Figure 1 It is a cross-sectional schematic diagram of a halogen-free low-smoke B1-class fire-resistant and high-shielding flexible cable of the present invention.

[0020] Reference numerals are:

[0021] Flexible conductor 1, fire-resistant layer 2, insulating layer 3, mineral filling rope 4, isolation layer 5, metal shielding layer 6, flame retardant oxygen barrier layer 7, halogen-free low-smoke flame retardant B1-class outer sheath 8. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present utility model, and should not be construed as limiting the present utility model.

[0023] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

[0024] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0025] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] Refer to Figure 1 For an embodiment of a halogen-free, low-smoke, B1-level fire-resistant, high-shielding flexible cable for security applications of the present utility model, the cable is sequentially provided with a cable core, an isolation layer 5, a metal shielding layer 6, a flame-retardant oxygen barrier layer 7, and a halogen-free, low-smoke, flame-retardant B1-level outer sheath 8 from the inner layer to the outer layer. The cable core is formed by stranding two or more insulated wire cores together, and the stranding direction is to the right, and the pitch is not greater than 20 times the outer diameter of the cable; the stranding gap of the cable core is filled with an environmentally friendly, flame-retardant, non-hygroscopic mineral filling rope 4 to make it round and solid. The insulated wire core is sequentially composed of a soft conductor 1, a fire-resistant layer 2, and an insulating layer 3 from the inner layer to the outer layer.

[0027] The soft conductor 1 adopts the Class 6 conductor in GB / T 3956-2008, which has a wider range of applications, can meet the requirements of different occasions, and the Class 6 conductor has finer single filaments than the Class 2 and Class 5 conductors, better flexibility and bendability, longer service life, is easier to lay, and the conductor strength will also increase.

[0028] The fire-resistant layer 2 is formed by overlapping and wrapping two layers of high-environmental protection calcined mica tape on the conductor, replacing the commonly used phlogopite tape or synthetic mica tape. Its wrapping direction is opposite to the conductor stranding direction, and the overlapping rate is not less than 25%. The high-environmental protection calcined mica tape is easy to wrap, does not contain fluorine or halogen, does not produce thick smoke and carbon deposits when burning, is extremely environmentally friendly, and will form a dense conductor protection shell (insulator) at high temperatures. Therefore, using this material not only ensures the flexibility of the fire-resistant layer but also further improves its temperature resistance level, effectively extending the power and signal transmission time of B1-level cables and enhancing the fire-resistant performance.

[0029] The insulating layer 3 is extruded from a low-smoke, halogen-free, flame-retardant, and environmentally friendly cross-linked polyolefin material. Its insulation thickness meets the requirements of the JB / T10491-2014 standard and is identified by different color markings at the same time.

[0030] The mineral filling rope 4 uses cotton yarn as the carrier, then immerses the cotton yarn with mineral slurry and dries it. It has the characteristics of non-combustion and flame retardancy. Moreover, this material not only does not harm the physical health of employees during production but can also decompose naturally when discarded, does not produce a large amount of pollutants, and has a lower material specific gravity, making it more cost-effective.

[0031] The isolating layer 5 is formed by overlapping and wrapping a non-hygroscopic wrapping material, usually using one layer of environmentally friendly polyester tape, and the overlapping rate of wrapping is not less than 30%.

[0032] The metal shielding layer 6 uses multiple oxygen-free copper single filaments with a wire diameter of not less than 0.10 mm. A number of single filaments are combined and then braided for shielding, and the braiding density is not less than 85% to ensure that it can better meet the requirements of transmission performance.

[0033] The flame-retardant oxygen barrier layer 7 is formed by overlapping and wrapping a halogen-free, low-smoke, and high-flame-retardant tape. Among them, the tape material is preferably composed of polyester yarn and glass fiber yarn, its oxygen index is not less than 65, and the overlapping rate of wrapping is not less than 30% to enhance the flame-retardant characteristics of the cable, further protect the insulated wire core, and avoid damage to the outer sheath caused by the metal shielding layer.

[0034] The halogen-free low-smoke flame-retardant B1 outer sheath 8 is extruded from halogen-free low-smoke flame-retardant B1 environmental protection polyolefin material. Its sheath thickness meets the standard requirements, and it greatly improves the reliability and safety of the cable while ensuring the B1 combustion requirements. Among them, the halogen-free low-smoke flame-retardant B1 environmental protection polyolefin material can be cross-linked or non-cross-linked. The non-cross-linked material has a greater cost advantage on the premise of ensuring its performance requirements.

[0035] The halogen-free low-smoke B1 fire-resistant high-shielding flexible cable for security use of the present utility model has the characteristic of high flexibility compared with traditional flame-retardant cables. It can not only greatly increase the bending times of the cable, extend the service life of the wire, but also facilitate pipe threading construction; the fire-resistant characteristic of the cable of the present utility model can effectively extend the normal working time of the cable in the fire state, ensure that electric energy can still be normally transmitted within a certain time after the fire, and ensure that electrical devices such as lighting and fire alarm can continue to be powered on within a certain time, so that the rescue work can proceed normally; at the same time, the B1 combustion characteristic of the cable of the present utility model further reduces the harm to personnel and equipment.

[0036] The above are only specific embodiments of the present utility model, but the technical features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.

Claims

1. A halogen-free low-smoke B1-grade fire-resistant high-shield flexible cable for security, characterized in that: include: The cable core is formed by twisting a plurality of insulated wire cores, and the twisted gaps are filled with a mineral filling rope (4); The insulating wire core comprises, from the inner layer to the outer layer, a soft conductor (1), a fire-resistant layer (2) and an insulating layer (3); The outer layer of the cable core is provided with an isolation layer (5), a metal shielding layer (6), a flame retardant oxygen isolation layer (7) and a halogen-free low-smoke flame retardant B1 grade outer sheath (8) in sequence.

2. The halogen-free, low-smoke, B1-grade fire-resistant, high-shield flexible cable for security use according to claim 1, characterized in that: The soft conductor (1) adopts the Class 6 conductor in GB / T 3956-2008.

3. The halogen-free, low-smoke, B1-grade fire-resistant, high-shield flexible cable for security use according to claim 1, characterized in that: The refractory layer (2) is a two-layer calcined mica tape wrapped structure, and the wrapping direction is opposite to the conductor twisting direction.

4. The halogen-free, low-smoke, B1-grade fire-resistant, high-shield flexible cable for security use according to claim 1, characterized in that: The insulating layer (3) is made by extruding an environmentally friendly, low-smoke, halogen-free, flame-retardant cross-linked polyolefin material.

5. The halogen-free, low-smoke, B1-grade fire-resistant, high-shield flexible cable for security use according to claim 1, characterized in that: The mineral filling rope (4) is made of an environmentally friendly material that is non-hygroscopic and has flame retardant properties.

6. The halogen-free, low-smoke, B1-grade fire-resistant, high-shield flexible cable for security use according to claim 1, characterized in that: The isolation layer (5) is formed by overlapping and wrapping a non-hygroscopic wrapping material, and the wrapping overlap rate is not less than 30%.

7. The halogen-free, low-smoke, B1-grade fire-resistant, high-shield flexible cable for security use according to claim 1, characterized in that: The metal shielding layer (6) is made of oxygen-free copper monofilaments with a wire diameter of more than 0.1 mm. A plurality of the monofilaments are wired together and then braided for shielding, and the braiding density is not less than 85%.

8. The halogen-free, low-smoke, B1-grade fire-resistant, high-shield flexible cable for security use according to claim 1, characterized in that: The flame retardant oxygen-isolating layer (7) is formed by overlapping and wrapping halogen-free, low-smoke, high-flame retardant tape, the oxygen index of which is not less than 65, and the wrapping overlap rate is not less than 30%.

9. The halogen-free, low-smoke, B1-grade fire-resistant, high-shield flexible cable for security use according to claim 8, characterized in that: The halogen-free, low-smoke and highly flame-retardant tape is configured to be composed of polyester yarn and glass fiber yarn.

10. The halogen-free, low-smoke, B1-grade fire-resistant, high-shield flexible cable for security use according to claim 1, characterized in that: The halogen-free, low-smoke, flame-retardant B1 grade outer sheath (8) is made by extruding a halogen-free, low-smoke, flame-retardant B1 grade environmentally friendly polyolefin material.

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