B1-level flame-retardant cable

Abstract

According to the B1-level flame-retardant cable provided by the utility model, a combined structure of the low-smoke halogen-free flame-retardant layer, the inner flame-retardant layer and the outer flame-retardant layer is introduced, so that the cable is excellent in performance under a fire hazard condition, the cable core is effectively prevented from being burnt, and basic functions of an electrical system can be kept in a certain time when the fire hazard occurs in time; and adverse effects of fire on equipment and lines are reduced. Meanwhile, the shielding layer arranged on the cable prevents signals in the cable from external electromagnetic interference, electromagnetic radiation of the cable to the external environment is reduced, the water-blocking layer effectively improves the water-blocking performance of the cable, the wear-resistant outer sheath ensures the compactness of the structure in the outer sheath, the wear-resistant outer sheath is more wear-resistant, and the service life of the wear-resistant outer sheath is prolonged. The cable cannot be easily damaged during use, and the service life of the cable is ensured. Therefore, the B1-level flame-retardant cable has good flame-retardant performance and excellent performance, and is excellent in performance in a complex environment, and a reliable solution is provided for the stability and reliability of an electric power system.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a B1-class flame-retardant cable. Background Art

[0002] Cables are usually rope-like cables made of several or several groups of wires (at least two in each group). Each group of wires is insulated from each other and often twisted around a center. The entire outside is covered with a highly insulating covering. Cables have the characteristics of being energized inside and insulated outside. Cables include power cables, control cables, compensation cables, shielded cables, high-temperature cables, computer cables, signal cables, coaxial cables, fire-resistant cables, marine cables, mining cables, aluminum alloy cables, etc. They are all composed of single or multiple strands of wires and an insulating layer, and are used to connect circuits, electrical appliances, etc.

[0003] In important densely populated public and residential buildings (such as subways, high-rise residential and commercial buildings, shopping malls, theaters, stadiums, highway tunnel projects, etc.), B1-class flame-retardant cables have become widely used products. However, the flame retardant effect of some existing B1-class flame-retardant cables is not good and cannot meet the use requirements well. Therefore, the industry has been continuously improving the flame retardant performance of B1-class flame-retardant cables. In order to better improve the flame retardant performance of B1-class flame-retardant cables, this application proposes a B1-class flame-retardant cable. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a B1-class flame-retardant cable, which solves the problem that some B1-class flame-retardant cables in the prior art have poor flame-retardant effects.

[0005] A Class B1 flame-retardant cable, comprising: a cable core, the cable core comprising a plurality of conductors tangent to each other in pairs, the conductors comprising a plurality of twisted conductors and an insulating layer, an insulating shielding layer, a flame-retardant layer and a steel wire mesh armor layer sequentially coated on the outside of the conductors; the outside of the cable core is coated from inside to outside with an inner mesh armor layer, a low-smoke halogen-free flame-retardant layer, a shielding layer, an inner flame-retardant layer, a water-blocking layer, an outer flame-retardant layer and a wear-resistant outer sheath, inorganic flame retardants are filled between the conductors in the inner mesh armor layer, the inner flame retardant layer is provided with a plurality of first accommodating cavities along its circumference, the first accommodating cavities are filled with inorganic flame retardants, the outer flame retardant layer is provided with a plurality of second accommodating cavities along its circumference, the second accommodating cavities are filled with silicon-based flame retardants.

[0006] Preferably, the insulating layer is made of a cross-linked polyethylene (XLPE) material, the insulating shielding layer is made of a semi-conductive outer shielding material, and the flame retardant layer is made of a mica tape flame retardant layer. Cross-linked polyethylene (XLPE) is a superior insulating material with high electrical strength and heat resistance. It can effectively isolate conductors, reduce the capacitance and inductance of cables, improve the transmission performance of cables, and ensure stable signal transmission. The use of a semi-conductive outer shielding material as an insulating shielding layer helps to effectively shield external electromagnetic interference and prevent the occurrence of interference signals. At the same time, the mica tape flame retardant layer has excellent high temperature resistance and combustion resistance, can effectively suppress the spread of flames, and improve the safety of cables under fire conditions. The mica tape can also provide additional flame retardant protection in high temperature environments and increase the fire resistance of the cable core.

[0007] Preferably, the wear-resistant outer sheath is a low-smoke halogen-free sheath, and the outer side thereof is sprayed with alumina wear-resistant material. The setting of the low-smoke halogen-free sheath allows the internal cable core to be well wrapped, and also helps to reduce the amount of smoke and harmful gases generated by the cable in the event of a fire. Spraying alumina wear-resistant material on the outer side can improve the wear resistance of the cable, which has obvious advantages for scenarios where the cable is subjected to mechanical damage such as friction and extrusion during installation and use, such as construction sites or equipment that needs to be moved frequently, preventing damage to the wear-resistant outer sheath and reducing the service life of the cable.

[0008] Preferably, a number of reinforcing steel wires are embedded in the wear-resistant outer sheath. The embedding of the reinforcing steel wires can effectively increase the mechanical strength of the cable and improve its tensile and extrusion resistance. This has a protective effect on the cable from the influence of external forces during construction, installation and transportation, reduces damage to the cable structure caused by external forces, and thus improves the reliability of the cable in various application scenarios.

[0009] Preferably, the water-blocking layer is a high-swelling water-blocking yarn layer, which has excellent water-absorbing and swelling properties and can rapidly swell when the cable is intruded by water, filling the internal gaps of the cable to form an effective waterproof barrier. This can effectively prevent the cable from malfunctioning in a humid or flooded environment, improve the waterproof performance of the cable, and ensure the reliable operation of the cable under harsh conditions.

[0010] Preferably, the silicon-based flame retardant is a silicone rubber flame retardant or a silicone resin flame retardant. When the silicone rubber flame retardant or the silicone resin flame retardant burns, it will generate a dense and stable silicon-containing (main component SiO2) carbon layer, which not only prevents combustion, but also acts as a heat and oxygen insulation, achieving the purpose of flame retardancy, low smoke, and low toxicity, so that the outer flame retardant layer has a good flame retardant effect.

[0011] Preferably, the inorganic flame retardant is an aluminum hydroxide inorganic flame retardant or a magnesium hydroxide inorganic flame retardant. Aluminum hydroxide and magnesium hydroxide are common inorganic flame retardants, which can release water vapor under high temperature conditions, stabilize flame retardancy, and effectively inhibit the spread of flames, so that they can play an important role in the flame retardant system of cables and improve the overall flame retardant properties of cables. At the same time, the combustion products of aluminum hydroxide inorganic flame retardant or magnesium hydroxide inorganic flame retardant are mainly water vapor and oxides, do not contain harmful gases, and have relatively less smoke, which reduces the harm to workers in the event of combustion.

[0012] Preferably, an anti-stretching member is provided at the center of the cable core, so that the cable can better cope with external forces such as stretching and extrusion, thereby extending the service life of the cable.

[0013] Preferably, the low-smoke halogen-free flame retardant layer is embedded in the mesh holes of the inner mesh armor layer on the side facing the inner mesh armor layer, so that the low-smoke halogen-free flame retardant layer can be better fixed and the flame retardant effect is improved.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The utility model provides a B1-class flame-retardant cable. By introducing a combined structure of a low-smoke halogen-free flame-retardant layer, an inner flame-retardant layer, and an outer flame-retardant layer, the cable performs well under fire conditions, effectively preventing the cable core from burning, so that the basic functions of the electrical system can be maintained for a certain period of time when a fire occurs in time, reducing the adverse effects of the fire on equipment and lines. At the same time, the shielding layer provided in the cable prevents the signal inside the cable from being interfered with by external electromagnetic interference, and also reduces the electromagnetic radiation of the cable to the external environment. The water-blocking layer provided effectively improves the water-blocking performance of the cable. The wear-resistant outer sheath ensures the tightness of the structure inside the outer sheath. At the same time, the wear-resistant outer sheath is more wear-resistant and will not be easily damaged during use, ensuring the service life of the cable. Therefore, the B1-class flame-retardant cable has good flame-retardant properties, and at the same time, the performance and service life are also excellent. It performs well in complex environments and provides a reliable solution for the stability and reliability of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the cross-sectional structure of the B1-class flame-retardant cable described in the utility model;

[0017] in:

[0018] 1-cable core, 11-conductor, 12-insulating layer, 13-insulating shielding layer, 14-flame retardant layer, 15-steel wire mesh armor layer, 2-inner mesh armor layer, 3-low smoke zero halogen flame retardant layer, 4-shielding layer, 5-inner flame retardant layer, 6-water blocking layer, 7-outer flame retardant layer, 8-wear-resistant outer sheath, 9-tensile strength member, 51-first accommodating cavity, 71-second accommodating cavity, 81-reinforcement steel wire. DETAILED DESCRIPTION

[0019] The embodiments described below are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figure 1 The present embodiment provides a Class B1 flame-retardant cable, comprising: a cable core 1, the cable core 1 comprising a plurality of conductors 11 tangent to each other, the conductors 11 comprising a plurality of twisted conductors 11 and an insulating layer 12, an insulating shielding layer 13, a flame-retardant layer 14 and a steel wire mesh armor layer 15 sequentially coated on the outside of the conductors 11; the outer side of the cable core 1 is coated with an inner mesh armor layer 2, a low-smoke halogen-free flame-retardant layer 3, a shielding layer 4, an inner flame-retardant layer 5, a water-blocking layer 6, an outer flame-retardant layer 7 and a wear-resistant outer sheath 8 from the inside to the outside, the conductors 11 in the inner mesh armor layer 2 are filled with inorganic flame retardants, the inner flame-retardant layer 5 is provided with a plurality of first accommodating cavities 51 along its circumference, the first accommodating cavities 51 are filled with inorganic flame retardants, the outer flame-retardant layer 7 is provided with a plurality of second accommodating cavities 71 along its circumference, the second accommodating cavities 71 are filled with silicon-based flame retardants.

[0021] Preferably, the insulating layer 12 is made of a cross-linked polyethylene (XLPE) material insulating layer 12, the insulating shielding layer 13 is made of a semi-conductive outer shielding material insulating shielding layer 13, and the flame retardant layer 14 is made of a mica tape flame retardant layer 14. Cross-linked polyethylene (XLPE) is a superior insulating material with high electrical strength and heat resistance. It can effectively isolate the conductor 11, reduce the capacitance and inductance of the cable, improve the transmission performance of the cable, and ensure stable signal transmission. The use of a semi-conductive outer shielding material as the insulating shielding layer 13 helps to effectively shield external electromagnetic interference and prevent the occurrence of interference signals. At the same time, the mica tape flame retardant layer 14 has excellent high temperature resistance and combustion resistance, can effectively suppress the spread of flames, and improve the safety of the cable under fire conditions. The mica tape can also provide additional flame retardant protection in a high temperature environment and increase the fire resistance of the cable core 1.

[0022] Preferably, the wear-resistant outer sheath is a low-smoke halogen-free sheath, and the outer side thereof is sprayed with alumina wear-resistant material. The provision of the low-smoke halogen-free sheath allows the internal cable core 1 to be well wrapped, and also helps to reduce the amount of smoke and harmful gases generated by the cable during a fire. Spraying alumina wear-resistant material on the outer side can improve the wear resistance of the cable, which has obvious advantages for scenarios where the cable is subjected to mechanical damage such as friction and extrusion during installation and use, such as construction sites or equipment that needs to be frequently moved, and prevents damage to the wear-resistant outer sheath and reduces the service life of the cable.

[0023] Preferably, a number of reinforcing steel wires 81 are embedded in the wear-resistant outer sheath. The embedding of the reinforcing steel wires 81 can effectively increase the mechanical strength of the cable and improve its tensile and extrusion resistance. This has a protective effect on the cable from the influence of external forces during construction, installation and transportation, reduces damage to the cable structure caused by external forces, and thus improves the reliability of the cable in various application scenarios.

[0024] Preferably, the water-blocking layer 6 is a high-expansion water-blocking yarn layer, which has excellent water-absorbing and swelling properties, and can rapidly swell when the cable is intruded by water, filling the internal gaps of the cable to form an effective waterproof barrier. This can effectively prevent the cable from malfunctioning in a humid or flooded environment, improve the waterproof performance of the cable, and ensure the reliable operation of the cable under harsh conditions.

[0025] Preferably, the silicon-based flame retardant is a silicone rubber flame retardant or a silicone resin flame retardant. When the silicone rubber flame retardant or the silicone resin flame retardant burns, it will generate a dense and stable silicon-containing (main component SiO2) carbon layer, which not only prevents combustion, but also acts as a heat and oxygen insulation, achieving the purpose of flame retardancy, low smoke, and low toxicity, so that the outer flame retardant layer 7 has a good flame retardant effect.

[0026] Preferably, the inorganic flame retardant is an aluminum hydroxide inorganic flame retardant or a magnesium hydroxide inorganic flame retardant. Aluminum hydroxide and magnesium hydroxide are common inorganic flame retardants, which can release water vapor under high temperature conditions, stabilize flame retardancy, and effectively inhibit the spread of flames, so that they can play an important role in the flame retardant system of cables and improve the overall flame retardant properties of cables. At the same time, the combustion products of aluminum hydroxide inorganic flame retardant or magnesium hydroxide inorganic flame retardant are mainly water vapor and oxides, do not contain harmful gases, and have relatively less smoke, which reduces the harm to workers in the event of combustion.

[0027] Preferably, an anti-tensile member 9 is provided at the center of the cable core 1, so that the cable can better cope with external forces such as stretching and extrusion, thereby extending the service life of the cable.

[0028] Preferably, the low-smoke halogen-free flame retardant layer 3 is embedded in the mesh of the inner mesh armor layer 2 on the side facing the inner mesh armor layer 2, so that the low-smoke halogen-free flame retardant layer 3 can be better fixed and the flame retardant effect is improved.

[0029] The utility model provides a B1-class flame-retardant cable. By introducing a combined structure of a low-smoke halogen-free flame-retardant layer 3, an inner flame-retardant layer 5, and an outer flame-retardant layer 7, the cable performs well under fire conditions, effectively preventing the cable core 1 from burning, and enabling the basic functions of the electrical system to be maintained for a certain period of time in the event of a fire, thereby reducing the adverse effects of the fire on equipment and lines. Specifically, the outer flame-retardant layer 7 is filled with a silicon-based flame retardant, which has an excellent flame-retardant and fire-extinguishing effect and can block the spread of flames. When the flame breaks through the outer flame-retardant layer 7, the inorganic flame retardant filled in the inner flame-retardant layer 5 can extinguish the flame, and the setting of the low-smoke halogen-free flame-retardant layer 3 further enhances the flame-retardant effect. If the flame breaks through the wear-resistant outer sheath 8, the inorganic flame retardant filled and set between the conductors 11 in the inner mesh armor layer 2 can also have a flame-retardant effect, further extinguishing the flame. , and the setting of the steel wire mesh armor layer and the inner mesh armor layer 2 also ensures the steel wire mesh armor layer; the outer side of the cable core 1 is covered with an inner mesh armor layer 2 from the inside to the outside and is tightly filled; at the same time, the shielding layer 4 set in the cable prevents the signal inside the cable from being interfered with by external electromagnetic interference, and reduces the electromagnetic radiation of the cable to the external environment. The water-blocking layer 6 effectively improves the water-blocking performance of the cable. The setting of the wear-resistant outer sheath 8 ensures the tightness of the structure inside the outer sheath, and the wear-resistant outer sheath is more wear-resistant, which ensures the service life of the cable.

[0030] The above disclosures are only several preferred embodiments of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A B1 flame-retardant cable, characterized in that: It contains: A cable core, the cable core comprising a plurality of conductors tangent to each other, the conductors comprising a plurality of twisted conductors and an insulating layer, an insulating shielding layer, a flame retardant layer and a steel wire mesh armor layer sequentially coated on the outside of the conductors; The outer side of the cable core is covered with an inner mesh armor layer, a low-smoke halogen-free flame retardant layer, a shielding layer, an inner flame retardant layer, a water-blocking layer, an outer flame retardant layer and a wear-resistant outer sheath from the inside to the outside. Inorganic flame retardants are filled between the conductors in the inner mesh armor layer. The inner flame retardant layer is provided with a plurality of first accommodating cavities along its circumference, and the first accommodating cavities are filled with inorganic flame retardants. The outer flame retardant layer is provided with a plurality of second accommodating cavities along its circumference, and the second accommodating cavities are filled with silicon-based flame retardants.

2. The B1-class flame-retardant cable according to claim 1, characterized in that: The insulating layer is made of a cross-linked polyethylene (XLPE) material, the insulating shielding layer is made of a semi-conductive outer shielding material, and the flame retardant layer is made of a mica tape flame retardant layer.

3. The B1-class flame-retardant cable according to claim 1, characterized in that: The wear-resistant outer sheath is a low-smoke halogen-free sheath, and the outer side of the sheath is sprayed with aluminum oxide wear-resistant material.

4. The B1-class flame-retardant cable according to claim 1, characterized in that: A plurality of reinforcing steel wires are embedded in the wear-resistant outer sheath.

5. The B1-class flame-retardant cable according to claim 1, characterized in that: The water-blocking layer is a high-expansion water-blocking yarn layer.

6. The B1-class flame-retardant cable according to claim 1, characterized in that: The silicon-based flame retardant is a silicone rubber flame retardant or a silicone resin flame retardant.

7. The B1-class flame-retardant cable according to claim 1, characterized in that: The inorganic flame retardant is an aluminum hydroxide inorganic flame retardant or a magnesium hydroxide inorganic flame retardant.

8. The B1-class flame-retardant cable according to claim 1, characterized in that: An anti-stretching member is arranged at the center of the cable core.

9. The B1-class flame-retardant cable according to claim 1, characterized in that: The low-smoke halogen-free flame-retardant layer is embedded in the meshes of the inner mesh armor layer on a side facing the inner mesh armor layer.

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