Flame-retardant power cable

Abstract

The utility model discloses a flame-retardant power cable, and aims to solve the problems that a modified polyacrylonitrile fiber filling layer used by a conventional flame-retardant power cable is easy to generate static electricity due to friction, the static electricity in the cable can generate an electromagnetic field, the transmission stability of the cable is influenced, electromagnetic interference is generated on other surrounding electronic equipment and systems, and the service life of the cable is influenced. The cable core comprises wire cores, a filling layer and a steel wire rope reinforcing core, the six wire cores are annularly arranged in the cable core, the filling layer is arranged between the wire cores and the steel wire rope reinforcing core, the steel wire rope reinforcing core is arranged between the wire cores, and the filling layer is arranged between the wire cores and the steel wire rope reinforcing core. The cable core comprises a conductor and a composite insulation shielding layer, the conductor is located inside the cable core, the composite insulation shielding layer is located outside the conductor, the outer side of the cable core is provided with a lining layer, and the outer side of the lining layer is provided with a composite flame-retardant layer.

Description

Technical Field

[0001] This utility model relates to the field of flame-retardant cable technology, and in particular to a flame-retardant power cable. Background Technology

[0002] Flame-retardant cables are cables that do not easily burn under certain conditions and do not release toxic fumes when burning. These cables are typically used in environments where flammable or toxic gases may be present to reduce fire risk and minimize threats to life and property. The characteristics of flame-retardant cables lie in the materials used and the manufacturing process. The outer sheath of these cables is usually made of flame-retardant materials, such as flame-retardant PVC, which shrinks when exposed to flames, preventing the spread of fire. Furthermore, the internal filling material of flame-retardant cables is also specially treated to prevent the release of toxic fumes when the wires burn. Flame-retardant cables are widely used in various fields, such as power, chemical, petroleum, and mining. In these fields, where large amounts of flammable and toxic substances are present, the use of flame-retardant cables can effectively reduce fire risk and protect personnel and property safety.

[0003] Chinese Patent Publication No. CN209895796U discloses a flame-retardant cable, comprising a conductor core. An insulation layer is pressed onto the outer wall of the conductor core. The insulation layer includes a polyimide film layer, and the inner side of the polyimide film layer is pressed together with the conductor core. An alkali-free cloth filling layer is pressed onto the outer wall of the polyimide film layer. An electrically insulating silicone grease coating is applied to the outer wall of the electrically insulating silicone grease coating. A flame-retardant layer is pressed onto the outer wall of the electrically insulating silicone grease coating. The flame-retardant layer includes a modified polyacrylonitrile fiber filling layer, and the inner side of the modified polyacrylonitrile fiber filling layer is pressed together with the electrically insulating silicone grease coating. This flame-retardant cable possesses basic electrical insulation and flame-retardant properties, while also exhibiting excellent corrosion and water resistance. It prevents corrosion damage or water ingress caused by prolonged use due to external influences, avoids short circuits, ensures normal cable operation, and is conducive to widespread adoption.

[0004] The existing technical solutions described above have the following drawbacks: The flame-retardant cable is composed of a modified polyacrylonitrile fiber filling layer, an aluminum silicate fire-resistant layer, and a flame-retardant adhesive. The modified polyacrylonitrile fiber filling layer is prone to static electricity due to friction. The static electricity in the cable will generate an electromagnetic field, which will affect its own transmission stability and also cause electromagnetic interference to other electronic devices and systems in the vicinity. The aluminum silicate fire-resistant layer is made of aluminum silicate material with poor toughness and is easily damaged, making it difficult to safely and stably protect the cable. Therefore, we propose a flame-retardant power cable to solve the problems mentioned above. Utility Model Content

[0005] The purpose of this utility model is to provide a flame-retardant power cable to solve the problems mentioned in the background art, namely that the modified polyacrylonitrile fiber filling layer used in existing flame-retardant cables is prone to static electricity due to friction. The static electricity in the cable will generate an electromagnetic field, which will affect its own transmission stability and also cause electromagnetic interference to other electronic devices and systems in the vicinity. Furthermore, the aluminum silicate fire-resistant layer uses aluminum silicate material with poor toughness, which is easy to break and cannot safely and stably protect the cable.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a flame-retardant power cable, comprising a cable core, the cable core including a conductor, a filling layer, and a steel wire rope reinforcing core, wherein the steel wire rope reinforcing core is disposed at the center of the cable core, and six conductors are arranged in a ring inside the cable core, a filling layer is disposed between the conductors and the steel wire rope reinforcing core, the conductor including a conductor and a composite insulation shielding layer, the conductor being located inside the conductor and the composite insulation shielding layer being located outside the conductor, an inner lining layer being disposed on the outer side of the cable core, a composite flame-retardant layer being disposed on the outer side of the inner lining layer, a steel wire armoring layer being disposed on the outer side of the composite flame-retardant layer, and an outer sheath being disposed on the outer side of the steel wire armoring layer.

[0007] Preferably, the composite insulating shielding layer includes an insulating layer and a first shielding layer. The insulating layer is located on the outer surface of the composite insulating shielding layer, and the first shielding layer is located on the inner surface of the composite insulating shielding layer. The insulating layer is made of water-tree resistant chemically cross-linked polyethylene insulating material, and the first shielding layer is made of cross-linked semi-conductive shielding material.

[0008] Preferably, the inner lining layer includes a fireproof layer, a protective layer, a waterproof layer, and a second shielding layer, wherein the second shielding layer is located on the inner surface of the inner lining layer, a waterproof layer is disposed on the outer side of the second shielding layer, a protective layer is disposed on the outer side of the waterproof layer, a fireproof layer is disposed on the outer side of the protective layer, and the fireproof layer is located on the outer surface of the inner lining layer. The fireproof layer is made of mica tape, the protective layer is made of semi-conductive ceramicized silicone rubber, the waterproof layer is made of EVA tape, and the second shielding layer is made of nylon.

[0009] Preferably, the composite flame retardant layer includes a first flame retardant layer, a second flame retardant layer, and a third flame retardant layer. The first flame retardant layer is located at the outer end of the composite flame retardant layer, and the third flame retardant layer is located on the inner side of the composite flame retardant layer. The second flame retardant layer is located between the first flame retardant layer and the third flame retardant layer. The material of the first flame retardant layer is flame retardant rubber, the material of the second flame retardant layer is ceramicized silicone rubber, and the material of the third flame retardant layer is wear-resistant rubber.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] The composite flame-retardant layer in this invention includes a first flame-retardant layer, a second flame-retardant layer, and a third flame-retardant layer. The flame-retardant rubber material of the first flame-retardant layer has excellent flame-retardant properties, which can effectively prevent the spread of flames and reduce the risk of fire. This is crucial for equipment such as cables that need to be installed in flammable, explosive, or other hazardous environments. It also has excellent high-temperature resistance, which can maintain the stability of its structure and performance in high-temperature environments, thus helping to improve the service life and safety performance of the cable. It possesses excellent electrical insulation properties, ensuring stable and reliable electrical performance of the cable; it has excellent chemical corrosion resistance, resisting the erosion of chemicals such as acids, alkalis, and salts, thus extending the cable's service life; the second flame-retardant layer, made of ceramicized silicone rubber, exhibits excellent flame-retardant properties, effectively preventing the spread of flames and reducing fire risk; at high temperatures, the ceramicized silicone rubber can form a hard shell, protecting burned objects from damage and buying valuable time for evacuation and rescue in case of fire; it also possesses excellent mechanical properties, such as wear resistance, pressure resistance, and impact resistance, resisting damage to the cable from external forces and improving its stability and reliability; the third flame-retardant layer, made of wear-resistant rubber, has excellent flame-retardant properties; in the event of a fire, the wear-resistant rubber can effectively prevent the spread of fire. It reduces fire damage; effectively resists various abrasions and frictions, extending cable lifespan; this abrasion resistance is particularly important in harsh working environments, as abrasion-resistant rubber ensures stable cable operation and reduces problems caused by cable faults, regardless of whether the environment is high-intensity or contains corrosive substances. It possesses excellent mechanical properties, such as high strength and high elasticity, resisting damage from external forces and improving cable stability and reliability; it also has good electrical insulation properties, ensuring stable and reliable electrical performance. This solves the problem that existing flame-retardant cables using modified polyacrylonitrile fiber filling layers are prone to static electricity generation due to friction. Static electricity in the cable generates electromagnetic fields, affecting its own transmission stability and causing electromagnetic interference to other surrounding electronic equipment and systems. Furthermore, the aluminosilicate fire-resistant layer uses aluminosilicate materials with poor toughness, making it easy to break and unable to safely and stably protect the cable.

[0012] The water-tree-resistant chemically cross-linked polyethylene insulation material in this invention possesses excellent electrical properties, such as high insulation resistance and low dielectric loss, ensuring superior electrical performance of the cable. The addition of an anti-water-tree agent enhances its water resistance, allowing it to maintain good insulation performance even in humid environments. It also exhibits high mechanical strength, preventing damage from external forces. Furthermore, it boasts high heat resistance, enabling normal operation at higher temperatures and reducing cable failure rates. This water-tree-resistant chemically cross-linked polyethylene insulation material is non-toxic, odorless, and harmless to the environment and human body, meeting environmental protection requirements. The interconnected semi-conductive shielding material in the shielding layer eliminates air gaps on the conductor core surface, improving resistance to partial discharge and tree discharge. It also provides a uniform electric field on the conductor core surface, reducing the maximum working field strength on the conductor surface caused by the wire effect. The interconnected semi-conductive shielding effectively weakens the electric field strength near burrs, reducing field emission and thus improving resistance to tree discharge. When the cable temperature suddenly rises, the interconnected semi-conductive shielding layer prevents the high temperature from immediately impacting the insulation layer, reducing the temperature rise and protecting the main insulation. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the present invention;

[0014] Figure 2 This is a three-dimensional structural diagram of the composite insulating shielding layer in this utility model;

[0015] Figure 3 This is a three-dimensional structural diagram of the inner lining layer in this utility model;

[0016] Figure 4 This is a schematic diagram of the composite flame-retardant layer in this utility model.

[0017] In the diagram: 1. Conductor; 2. Composite insulation shielding layer; 3. Core; 4. Filler layer; 5. Inner lining layer; 6. Cable core; 7. Composite flame-retardant layer; 8. Steel wire armor layer; 9. Outer sheath; 10. Insulation layer; 11. First shielding layer; 12. Fireproof layer; 13. Protective layer; 14. Waterproof layer; 15. Second shielding layer; 16. First flame-retardant layer; 17. Second flame-retardant layer; 18. Third flame-retardant layer; 19. Steel wire rope reinforcing core. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] Please see Figure 1-4This utility model provides an embodiment of a flame-retardant power cable, comprising a cable core 6, which includes wire cores 3, a filling layer 4, and a steel wire rope reinforcing core 19. The steel wire rope reinforcing core 19 is located at the center of the cable core 6. Six wire cores 3 are arranged in a ring inside the cable core 6. A filling layer 4 is provided between the wire cores 3 and the steel wire rope reinforcing core 19. Each wire core 3 includes a conductor 1 and a composite insulation shielding layer 2. The conductor 1 is located inside the wire core 3, and the composite insulation shielding layer 2 is located outside the conductor 1. An inner lining layer 5 is provided on the outside of the cable core 6. A composite flame-retardant layer 7 is provided on the outside of the inner lining layer 5. A steel wire armor layer 8 is provided on the outside of the composite flame-retardant layer 7. An outer sheath 9 is provided on the outside of the steel wire armor layer 8.

[0020] The composite flame-retardant layer 7 comprises a first flame-retardant layer 16, a second flame-retardant layer 17, and a third flame-retardant layer 18. The flame-retardant rubber material of the first flame-retardant layer 16 possesses excellent flame-retardant properties, effectively preventing the spread of flames and reducing fire risk. This is crucial for cables, which need to be installed in flammable, explosive, or other hazardous environments. It also exhibits excellent high-temperature resistance, maintaining structural and performance stability at high temperatures, thus contributing to improved cable lifespan and safety. Furthermore, it possesses good electrical insulation properties, ensuring stable and reliable electrical performance of the cable. The second flame-retardant layer 17, made of ceramicized silicone rubber, has excellent flame-retardant properties, effectively preventing the spread of flames and reducing fire risk. At high temperatures, the ceramicized silicone rubber forms a hard shell, protecting burned objects from damage and buying valuable time for evacuation and rescue in case of fire. The third flame-retardant layer 18, made of wear-resistant rubber, has excellent flame-retardant properties. In the event of a fire, the wear-resistant rubber can effectively prevent the spread of fire and reduce fire losses. It can effectively resist various abrasions and frictions, extending the service life of the cable. It has excellent mechanical properties, such as high strength and high elasticity, which can resist damage to the cable from external forces and improve the stability and reliability of the cable. It also has good electrical insulation properties, ensuring the stable and reliable electrical performance of the cable.

[0021] Please see Figure 1-2 The composite insulating shielding layer 2 includes an insulating layer 10 and a first shielding layer 11. The insulating layer 10 is located on the outer surface of the composite insulating shielding layer 2, and the first shielding layer 11 is located on the inner surface of the composite insulating shielding layer 2. The insulating layer 10 is made of water-tree resistant chemical cross-linked polyethylene insulating material, and the first shielding layer 11 is made of a cross-linked semi-conductive shielding material.

[0022] The water-tree resistant chemically cross-linked polyethylene insulation material of insulation layer 10 has excellent electrical properties, such as high insulation resistance and low dielectric loss, ensuring excellent electrical performance of the cable. Due to the addition of water-tree resistant agents, its water resistance is improved, allowing it to maintain good insulation performance even in humid environments. It has high mechanical strength, ensuring the cable is not easily damaged by external forces. It also has high heat resistance, allowing it to operate normally at higher temperatures and reducing cable failure rates. The water-tree resistant chemically cross-linked polyethylene insulation material is non-toxic, odorless, and harmless to the environment and human body, meeting environmental protection requirements. The cross-linked semi-conductive shielding material of shielding layer 11 eliminates air gaps on the surface of conductor core 3, improving resistance to partial discharge and tree discharge. It also uniformly distributes the electric field on the surface of the conductive core, reducing the maximum working field strength on the conductor surface caused by the wire effect, typically reducing the electric field strength on the wire surface by 20% to 30%. The interconnected semiconductive shield can effectively reduce the electric field strength near the burrs, reduce field emission, and thus improve the resistance to tree discharge. When the cable temperature rises suddenly, the interconnected semiconductive shield will prevent the high temperature from immediately impacting the insulation layer, thereby reducing the temperature rise of the insulation layer to a certain extent and protecting the main insulation.

[0023] Please see Figure 1 and Figure 3 The inner lining layer 5 includes a fireproof layer 12, a protective layer 13, a waterproof layer 14, and a second shielding layer 15. The second shielding layer 15 is located on the inner surface of the inner lining layer 5. The waterproof layer 14 is provided on the outer side of the second shielding layer 15. The protective layer 13 is provided on the outer side of the waterproof layer 14. The fireproof layer 12 is provided on the outer side of the protective layer 13 and is located on the outer surface of the inner lining layer 5. The fireproof layer 12 is made of mica tape, the protective layer 13 is made of semi-conductive ceramicized silicone rubber, the waterproof layer 14 is made of EVA tape, and the second shielding layer 15 is made of nylon.

[0024] The mica tape material of fireproof layer 12 has excellent insulation properties, effectively isolating the cable conductor 1, preventing current leakage, and reducing the risk of electric shock. Its heat resistance is also excellent, effectively slowing the spread of fire and reducing damage to the cable system. It can resist the thermal and electrical stresses generated during long-term cable operation, ensuring safe and reliable operation and extending service life. The semi-conductive ceramicized silicone rubber of protective layer 13 has excellent flame-retardant properties, resisting combustion at high temperatures, effectively preventing the spread of fire and improving the cable's fire resistance. At high temperatures, the semi-conductive ceramicized silicone rubber rapidly ceramicizes, sealing in smoke and toxic gases produced during combustion, preventing further fire spread. It also has good chemical corrosion resistance, resisting the erosion of acids, alkalis, salts, and other chemicals, improving the cable's service life. Furthermore, it possesses good mechanical properties. It can resist the mechanical stress and vibration generated during cable use, ensuring stable cable operation; it produces less smoke during combustion and does not contain halogens or other harmful substances, meeting environmental protection requirements. The EVA tape of waterproof layer 14 has excellent waterproof performance, effectively preventing water penetration, mainly due to its tight molecular structure and non-absorbent properties. It has good impact resistance and stress cracking resistance, able to withstand the mechanical stress experienced by the cable during use, avoiding cracking and damage; it is flexible and highly elastic, able to adapt well to cable bending and movement, maintaining cable integrity and electrical performance; it has good puncture resistance, able to resist external forces to puncture and damage the cable, protecting it from damage; it has good chemical stability, electrical properties and biocompatibility, able to operate stably in various environments, ensuring safe use of the cable. The nylon material of shielding layer 15 is an electrical signal shielding material that can effectively suppress the generation and propagation of electromagnetic interference. This is very important for protecting the cable from the influence of external electromagnetic fields. By shielding unwanted electrical signals, nylon electrical signal shielding material can improve the transmission quality of desired signals, ensuring signal integrity and accuracy. Nylon can prevent sensitive data from leaking through electromagnetic radiation, improving system security; it has excellent electrical insulation properties, effectively improving the insulation performance of wires and preventing safety faults such as leakage and short circuits; nylon material has insect-proof and termite-proof properties, which can reduce cable damage in the wild or humid environments; it is lightweight, has a smooth surface, and is self-lubricating, making it less prone to scratches when threading wires, facilitating conduit installation, and reducing damage to insulation during wire threading and installation.

[0025] Please see Figure 1 and Figure 4The composite flame retardant layer 7 includes a first flame retardant layer 16, a second flame retardant layer 17, and a third flame retardant layer 18. The first flame retardant layer 16 is located at the outer end of the composite flame retardant layer 7, and the third flame retardant layer 18 is located on the inner side of the composite flame retardant layer 7. The second flame retardant layer 17 is located between the first flame retardant layer 16 and the third flame retardant layer 18. The first flame retardant layer 16 is made of flame retardant rubber, the second flame retardant layer 17 is made of ceramicized silicone rubber, and the third flame retardant layer 18 is made of wear-resistant rubber.

[0026] The first flame-retardant layer 16, made of flame-retardant rubber, possesses excellent flame-retardant properties, effectively preventing the spread of flames and reducing the risk of fire. This is crucial for cables, which need to be installed in flammable, explosive, and other hazardous environments. It also exhibits excellent high-temperature resistance, maintaining structural and performance stability under high-temperature conditions, thus contributing to improved cable lifespan and safety. Furthermore, it possesses good electrical insulation properties, ensuring stable and reliable electrical performance; and excellent chemical corrosion resistance, resisting the erosion of acids, alkalis, salts, and other chemicals, further extending the cable's lifespan. The second flame-retardant layer 17, made of ceramicized silicone rubber, has excellent flame-retardant properties, effectively preventing the spread of flames and reducing fire risk. At high temperatures, the ceramicized silicone rubber forms a hard shell, protecting burned objects from damage and buying valuable time for evacuation and rescue in case of fire. It also has good chemical corrosion resistance, resisting the erosion of chemicals such as acids, alkalis, and salts, thus improving the cable's service life. Furthermore, it possesses excellent mechanical properties, such as wear resistance, pressure resistance, and impact resistance, resisting damage to the cable from external forces and improving its stability and reliability. The third flame-retardant layer 18, made of wear-resistant rubber, has excellent flame-retardant properties. In the event of a fire, the wear-resistant rubber can effectively prevent the spread of fire and reduce fire losses. It can also effectively resist various types of wear and friction, extending the cable's service life. This abrasion resistance is especially important in harsh working environments, because abrasion-resistant rubber can ensure the stable operation of cables in both high-intensity environments and places containing corrosive substances, reducing problems caused by cable faults. It has excellent mechanical properties, such as high strength and high elasticity, which can resist damage to cables from external forces and improve the stability and reliability of cables; it also has good electrical insulation properties, which can ensure the stable and reliable electrical performance of cables.

[0027] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A flame-retardant power cable, comprising a cable core (6), characterized in that: The cable core (6) includes a wire core (3), a filling layer (4), and a steel wire rope reinforcing core (19). The steel wire rope reinforcing core (19) is located at the center of the cable core (6). Six wire cores (3) are arranged in a ring inside the cable core (6). A filling layer (4) is provided between the wire cores (3) and the steel wire rope reinforcing cores (19). Each wire core (3) includes a conductor (1) and a composite insulation shielding layer (2). The conductor (1) is located inside the wire core (3), and the composite insulation shielding layer (2) is located outside the conductor (1). An inner lining layer (5) is provided on the outside of the cable core (6). A composite flame-retardant layer (7) is provided on the outside of the inner lining layer (5). A steel wire armor layer (8) is provided on the outside of the composite flame-retardant layer (7). An outer sheath (9) is provided on the outside of the lining layer (8); the inner lining layer (5) includes a fireproof layer (12), a protective layer (13), a waterproof layer (14) and a second shielding layer (15), and the second shielding layer (15) is located on the inner surface of the inner lining layer (5). A waterproof layer (14) is provided on the outside of the second shielding layer (15). A protective layer (13) is provided on the outside of the waterproof layer (14). A fireproof layer (12) is provided on the outside of the protective layer (13), and the fireproof layer (12) is located on the outer surface of the inner lining layer (5). The fireproof layer (12) is made of mica tape. The protective layer (13) is made of semi-conductive ceramicized silicone rubber. The waterproof layer (14) is made of EVA tape. The second shielding layer (15) is made of nylon.

2. The flame-retardant power cable according to claim 1, characterized in that: The composite insulating shielding layer (2) includes an insulating layer (10) and a first shielding layer (11). The insulating layer (10) is located on the outer surface of the composite insulating shielding layer (2), and the first shielding layer (11) is located on the inner surface of the composite insulating shielding layer (2). The insulating layer (10) is made of water-tree resistant chemical cross-linked polyethylene insulating material, and the first shielding layer (11) is made of cross-linked semi-conductive shielding material.

3. The flame-retardant power cable according to claim 1, characterized in that: The composite flame retardant layer (7) includes a first flame retardant layer (16), a second flame retardant layer (17) and a third flame retardant layer (18). The first flame retardant layer (16) is located at the outer end of the composite flame retardant layer (7), and the third flame retardant layer (18) is located on the inner side of the composite flame retardant layer (7). The second flame retardant layer (17) is located between the first flame retardant layer (16) and the third flame retardant layer (18). The material of the first flame retardant layer (16) is flame retardant rubber, the material of the second flame retardant layer (17) is ceramicized silicone rubber, and the material of the third flame retardant layer (18) is wear-resistant rubber.

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