Halogen-free low-smoke flame-retardant power cable

Abstract

The utility model discloses a halogen-free low-smoke flame-retardant power cable, relates to the technical field of flame-retardant power cables, and aims to solve the problems that the existing power cable is mostly provided with a flame-retardant layer, when the flame-retardant effect is poor, and once the cable is on fire and explodes, serious fire disasters and power outage accidents can be caused. Four wire cores are annularly arranged in the cable core, a filling layer is arranged among the wire cores, each wire core comprises a conductor and a composite insulation shielding layer, the conductor is located in the wire core, the composite insulation shielding layer is located outside the conductor, an inner lining layer is arranged on the outer side of the cable core, a composite flame-retardant layer is arranged on the outer side of the inner lining layer, and the composite flame-retardant layer is arranged on the outer side of the composite flame-retardant layer. The outer side of the composite flame-retardant layer is provided with a steel wire armor layer, and the outer side of the steel wire armor layer is provided with an outer sheath.

Description

Technical Field

[0001] The utility model relates to the technical field of flame-retardant power cables, in particular to a halogen-free low-smoke flame-retardant power cable. Background Art

[0002] Halogen-free, low-smoke, flame-retardant power cable is a new type of wire and cable product with the following main features and properties: The material of this cable does not contain halogen or chloride ions, so it will not release toxic hydrogen halides or other acid gases when burning. Halogen-free, low-smoke, flame-retardant power cable has a high degree of flame retardancy, which means that when a fire occurs, the cable spreads slowly, the smoke concentration is low, the visibility is high, and the amount of harmful gas released is small, which facilitates the evacuation of personnel. When the halogen-free, low-smoke, flame-retardant power cable burns, the combustion gas is less corrosive, which can avoid damage to instruments and equipment. In addition, the halogen-free and low-smoke characteristics greatly improve the cable material's resistance to aging, UV rays and other radiation, thereby extending the service life of the cable. Since the halogen-free, low-smoke, flame-retardant power cable does not release toxic hydrogen halides or other acid gases, it has less impact on the environment and is an environmentally friendly cable.

[0003] Most of the existing power cables are provided with a flame retardant layer. When the flame retardant effect is poor, once the cable catches fire or explodes, it will cause serious fire and power outage accidents. Therefore, we propose a halogen-free low-smoke flame retardant power cable to solve the above problems. Utility Model Content

[0004] The utility model aims to provide a halogen-free, low-smoke, flame-retardant power cable to solve the problem in the above background technology that most of the existing power cables are provided with a flame-retardant layer, but the flame-retardant effect is poor. Once the cable catches fire or explodes, it will cause serious fire and power outage accidents.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a halogen-free low-smoke flame-retardant power cable, comprising a cable core, the cable core comprising a wire core and a filling layer, four wire cores are arranged in a ring inside the cable core, a filling layer is arranged between the wire cores, the wire core comprises a conductor and a composite insulating shielding layer, the conductor is located inside the wire core, and the composite insulating shielding layer is located outside the conductor, an inner lining layer is arranged on the outside of the cable core, a composite flame-retardant layer is arranged on the outside of the inner lining layer, a steel wire armor layer is arranged on the outside of the composite flame-retardant layer, and an outer sheath is arranged on the outside of the steel wire armor layer.

[0006] Preferably, the composite insulating shielding layer includes an insulating layer and a shielding layer, the insulating layer is located on the inner surface of the composite insulating shielding layer, and the shielding layer is located on the outer surface of the composite insulating shielding layer, the insulating layer is made of silicone rubber, the shielding layer is made of aluminum foil, and the insulating layer and the shielding layer are connected by gluing.

[0007] Preferably, the inner lining layer includes an oxygen insulation layer, a first buffer layer and a second buffer layer, the oxygen insulation layer is located on the inner surface of the inner lining layer, the first buffer layer is arranged outside the oxygen insulation layer, the second buffer layer is arranged outside the first buffer layer, the material of the oxygen insulation layer is halogen-free, low-smoke and highly flame-retardant polyolefin, the material of the first buffer layer is polyester tape, the material of the second buffer layer is mica tape, and the first buffer layer is respectively connected to the oxygen insulation layer and the second buffer layer by gluing.

[0008] 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 on the inner surface of the composite flame retardant layer, the second flame retardant layer is arranged outside the first flame retardant layer, the third flame retardant layer is arranged outside the second flame retardant layer, the first flame retardant layer is made of flame retardant polyvinyl chloride, the second flame retardant layer is made of flame retardant polyethylene, and the third flame retardant layer is made of flame retardant cross-linked polyethylene.

[0009] Compared with the prior art, the beneficial effects of the utility model are:

[0010] The utility model has a halogen-free, low-smoke, high-flame-retardant polyolefin with a halogen-free characteristic by setting it, that is, no halogen-containing gas is released during combustion. This not only avoids pollution to the environment, but also reduces potential harm to human health. Secondly, the halogen-free, low-smoke, high-flame-retardant polyolefin has a low-smoke characteristic, that is, the amount of smoke generated during combustion is very small. This helps to reduce the interference of smoke on the sight of personnel when a fire occurs, and improve the efficiency of personnel evacuation and fire fighting. In addition, this material also has high flame retardant properties, which can effectively prevent or delay the spread of flames along the cable, thereby reducing the degree of damage caused by the fire and reducing damage to valuables and machinery and equipment. At the same time, the halogen-free, low-smoke, high-flame-retardant polyolefin also has high high temperature resistance, and can maintain normal operation for a certain period of time under high temperature or even flame roasting, thereby improving the service life of the cable. Finally, this material also has excellent electrical and mechanical properties, which can meet the use requirements of the cable in various environments and improve the safety and reliability of the cable. The polyester material has excellent insulation performance, which can effectively isolate the current inside the cable, prevent electrical safety problems such as leakage and short circuit, and ensure the normal operation of the cable. Polyester has high mechanical strength The polyester material can maintain a certain stability and performance in high and low temperature environments, so that the cable can work normally under extreme temperatures, which broadens the scope of use of the cable. The polyester material is easy to process and form, and can meet various process requirements in the cable manufacturing process, improving production efficiency. The polyester material is a recyclable material that meets environmental protection requirements and is conducive to reducing the pollution to the environment after the cable is discarded. Mica tape is a natural mineral insulating material with extremely high insulation resistance and dielectric strength. It can effectively isolate the conductors in the cable, prevent current leakage and electric shock risks, and ensure the safe operation of the cable. Mica has the characteristics of high temperature resistance and can maintain good stability in high temperature environments. It will not melt or deform due to high temperature. This makes mica an important refractory material in the cable insulation layer, which can maintain the normal operation of the cable in emergency situations such as fires and reduce the damage of fires to the cable system. Mica tape can enhance the mechanical strength of the cable and improve its tensile strength and wear resistance. It can protect the cable from external pressure and physical damage to a certain extent and extend the service life of the cable. Mica has strong stability to chemical substances and can resist the erosion of acid, alkali and other chemical substances, ensuring the stable operation of the cable in various environments.

[0011] The material of the first flame retardant layer in the utility model is flame retardant polyvinyl chloride, the material of the second flame retardant layer is flame retardant polyethylene, and the material of the third flame retardant layer is flame retardant cross-linked polyethylene. The flame retardant polyvinyl chloride insulated wire and cable has better flame retardant performance. This wire adopts special flame retardant and plasticizer, so that the polyvinyl chloride insulation layer is not easy to catch fire when burning, and can effectively slow down the spread of fire. Therefore, the flame retardant polyvinyl chloride insulated wire and cable is safer in fire accidents, helps to reduce fire losses and risks, and the electrical properties of the flame retardant polyvinyl chloride insulated wire and cable are relatively good. Because it adopts high-quality raw materials and advanced production technology, it has lower resistance and lower dielectric loss factor. This means that the wire has higher current carrying capacity and lower power loss, can withstand higher voltage and frequency, and is therefore suitable for various electrical equipment and lines. The structure of the polyvinyl chloride insulated sheathed wire and cable is not complicated, and the installation accessories are convenient, which makes it have a good market space in specific installation and application. At the same time, a very important advantage of using polyvinyl chloride insulated sheathed wire and cable is easy maintenance and low cost. Compared with polyethylene cables, maintenance and installation costs will be reduced by half, which greatly simplifies the cable maintenance process and reduces overall costs. PVC is a polar molecule, and PVC insulated wires and cables have certain flame retardant properties and will not burn so easily. At the same time, the smoke produced by halogen-free low-smoke flame-retardant polyvinyl chloride when burning is low in concentration, highly visible, and less corrosive, which is beneficial to environmental protection and reduces damage to equipment. Flame-retardant polyethylene cables can quickly contain the fire within a local area when burning, reduce the degree of damage caused by the fire, and reduce the problem of spontaneous combustion of the line caused by overheating due to current overload. This helps to reduce the risk of fire and protect people's lives and property. Flame-retardant polyethylene cables have excellent conductivity and heat dissipation, which can effectively reduce resistivity and reduce power loss, making the cable more efficient and stable when transmitting electrical signals. Flame-retardant polyethylene cables use special materials and processes to better protect the metal parts and insulation layers of the cable from fire damage, thereby extending the service life of the cable. Flame-retardant polyethylene cables can not only prevent the spread of fire when a fire occurs, but also ensure the normal operation of the wires, reduce the failure rate of the line, and improve the reliability of the line. The use of flame-retardant polyethylene cables is in compliance with national regulations, especially in places such as building decoration and home decoration, where fire prevention requirements are very strict. The use of this cable can ensure compliance with regulatory requirements and avoid safety hazards caused by non-compliance with standards. Cross-linked polyethylene has excellent heat resistance and can not decompose or carbonize at high temperatures or even below 200°C. The hot use time can reach 40 years and the long-term working temperature can reach 90°C. This significantly improves the current carrying capacity of the cable, enabling it to maintain stable performance in high temperature environments. Cross-linked polyethylene maintains the original good insulation properties of polyethylene, and the insulation resistance is further increased. Its dielectric loss tangent is very small and is not greatly affected by temperature.This ensures that the cable has lower energy loss and higher transmission efficiency when transmitting electrical signals. New chemical bonds are established between macromolecules, and the hardness, stiffness, wear resistance and impact resistance of cross-linked polyethylene are all improved. This makes up for the shortcomings of polyethylene being easily cracked by environmental stress, and improves the mechanical strength and durability of the cable. Cross-linked polyethylene has strong acid, alkali and oil resistance, and its combustion products are mainly water and carbon dioxide, which are less harmful to the environment. This meets the requirements of modern fire protection and reduces the pollution of the cable to the environment during use. Due to the excellent performance of cross-linked polyethylene cables, their reliability and failure rate have been significantly improved. This ensures that the cable can maintain stable performance during long-term use, reduces the losses and risks caused by cable failures, and solves the problem that most existing power cables are equipped with a flame retardant layer. When the flame retardant effect is not good, once the cable catches fire and explodes, it will cause serious fires and power outages. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model;

[0013] Figure 2 It is a schematic diagram of the structure of the composite insulating shielding layer in the utility model;

[0014] Figure 3 This is a schematic diagram of the structure of the inner lining layer in the utility model;

[0015] Figure 4 It is a schematic diagram of the structure of the composite flame retardant layer in the utility model.

[0016] In the figure: 1. conductor; 2. composite insulation shielding layer; 3. wire core; 4. filling layer; 5. lining layer; 6. cable core; 7. composite flame retardant layer; 8. steel wire armor layer; 9. outer sheath; 10. insulation layer; 11. shielding layer; 12. oxygen barrier layer; 13. first buffer layer; 14. second buffer layer; 15. first flame retardant layer; 16. second flame retardant layer; 17. third flame retardant layer. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0018] See also Figure 1-4The utility model provides an embodiment: a halogen-free low-smoke flame-retardant power cable, including a cable core 6, the cable core 6 includes a wire core 3 and a filling layer 4, four wire cores 3 are arranged in a ring inside the cable core 6, and a filling layer 4 is arranged between the wire cores 3. The wire core 3 includes a conductor 1 and a composite insulating shielding layer 2, the conductor 1 is located inside the wire core 3, and the composite insulating shielding layer 2 is located outside the conductor 1, an inner lining layer 5 is arranged on the outside of the cable core 6, a composite flame-retardant layer 7 is arranged on the outside of the inner lining layer 5, a steel wire armor layer 8 is arranged on the outside of the composite flame-retardant layer 7, and an outer sheath 9 is arranged on the outer side of the steel wire armor layer 8.

[0019] Flame-retardant PVC insulated wire and cable have better flame retardant properties. This kind of wire adopts special flame retardant and plasticizer to make the PVC insulation layer not easy to catch fire when burning, and can effectively slow down the spread of fire. Therefore, flame-retardant PVC insulated wire and cable are safer in fire accidents, which helps to reduce fire losses and risks. The electrical properties of flame-retardant PVC insulated wire and cable are also relatively good. Because it adopts high-quality raw materials and advanced production technology, it has lower resistance and lower dielectric loss factor. This means that the wire has higher current carrying capacity and lower power loss, and can withstand higher voltage and frequency, so it is suitable for various electrical equipment and lines. The structure of PVC insulated sheath wire and cable is not complicated, and the installation accessories are convenient, which makes it have a good market space in specific installation and application. At the same time, a very important advantage of using PVC insulated sheath wire and cable is easy maintenance and low cost. Compared with polyethylene cable, the maintenance and installation costs will be reduced by half, which greatly simplifies the maintenance process of the cable and reduces the overall cost. PVC is a polar molecule, and PVC insulated wire and cable have certain flame retardant properties and will not burn so easily. At the same time, the smoke produced by halogen-free low-smoke flame-retardant polyvinyl chloride when burning is low in concentration, highly visible, and less corrosive, which is beneficial to environmental protection and reduces damage to equipment. When burning, the flame-retardant polyethylene cable can quickly contain the fire in a local area, reduce the degree of damage caused by the fire, and reduce the problem of spontaneous combustion of the line caused by current overload heating. This helps to reduce the risk of fire and protect people's lives and property. The flame-retardant polyethylene cable has excellent conductivity and heat dissipation, which can effectively reduce the resistivity and reduce the power loss, making the cable more efficient and stable when transmitting electrical signals. The flame-retardant polyethylene cable uses special materials and processes to better protect the metal part and insulation layer of the cable from fire damage, thereby extending the service life of the cable. The flame-retardant polyethylene cable can not only prevent the spread of fire when a fire occurs, but also ensure the normal operation of the wire, reduce the failure rate of the line, and improve the reliability of the line. The use of flame-retardant polyethylene cables is in compliance with national regulations, especially in places such as building decoration and home decoration, where fire prevention requirements are very strict. The use of this cable can ensure compliance with regulatory requirements and avoid safety hazards caused by non-compliance with standards. Cross-linked polyethylene has excellent heat resistance and will not decompose or carbonize at high temperatures or even below 200°C. The thermal use time can reach 40 years and the long-term operating temperature can reach 90°C. This significantly improves the current carrying capacity of the cable, enabling it to maintain stable performance in high temperature environments. Cross-linked polyethylene maintains the original good insulation properties of polyethylene, and the insulation resistance is further increased. Its dielectric loss tangent is very small and is not greatly affected by temperature. This ensures that the cable has lower energy loss and higher transmission efficiency when transmitting electrical signals. New chemical bonds are established between macromolecules, and the hardness, stiffness, wear resistance and impact resistance of cross-linked polyethylene are improved.This makes up for the shortcoming of polyethylene being susceptible to cracking due to environmental stress, and improves the mechanical strength and durability of the cable. Cross-linked polyethylene has strong acid, alkali and oil resistance, and its combustion products are mainly water and carbon dioxide, which are less harmful to the environment. This meets the requirements of modern fire protection and reduces the pollution of the cable to the environment during use. Due to the excellent performance of cross-linked polyethylene cable, its reliability and failure rate have been significantly improved. This ensures that the cable can maintain stable performance during long-term use and reduces the loss and risk caused by cable failure.

[0020] See also Figure 2 The composite insulating shielding layer 2 includes an insulating layer 10 and a shielding layer 11. The insulating layer 10 is located on the inner surface of the composite insulating shielding layer 2, and the shielding layer 11 is located on the outer surface of the composite insulating shielding layer 2. The insulating layer 10 is made of silicone rubber, and the shielding layer 11 is made of aluminum foil. The insulating layer 10 and the shielding layer 11 are connected by gluing.

[0021] The insulating layer 10 is made by extrusion, and the shielding layer 11 is made by wrapping. Silicone rubber has excellent insulation performance, which can effectively protect the cable and avoid current leakage, thereby improving the safety and reliability of the cable. At the same time, this insulation can also protect people from the danger of electric shock. Secondly, silicone rubber has high stability and can withstand harsh environments, such as cold resistance and immunity to ultraviolet rays, thereby extending the service life of the cable. In addition, silicone rubber cables can maintain good performance in humid and high temperature environments and will not be easily damaged by environmental changes. Thirdly, silicone rubber cables have good flexibility, are easy to install, can be twisted freely, and are suitable for various indoor and outdoor environments. At the same time, silicone rubber cables also have the advantages of being waterproof and pressure-resistant, which can ensure normal power transmission during peak power consumption periods to meet the electricity needs of residents. Fourthly, silicone rubber is non-toxic and environmentally friendly, and heat dissipation is mainly carbon dioxide gas, which will not pollute the air and has environmental protection advantages. Fifthly, silicone rubber cables have excellent heat resistance and can be used at high temperatures or even below 380°C for a short time, ensuring that safety hazards will not be easily caused during high-intensity voltage transmission. Aluminum foil has excellent electromagnetic shielding effect, which can effectively shield electromagnetic interference inside the cable and block the influence of external electromagnetic fields. This helps to reduce signal interference and improve the transmission quality of the cable. Secondly, aluminum foil is relatively thin and light, which makes the cable more flexible and convenient during wiring and installation. Aluminum foil can also be easily bent and folded to adapt to cables of different shapes. In addition, aluminum foil has good conductivity, which can effectively disperse and absorb static electricity and electromagnetic radiation in the cable, protect the signal integrity inside the cable, and reduce signal fluctuations and interference. Aluminum foil also has excellent corrosion resistance and can form a dense oxide film in the air, effectively preventing further oxidation reactions. This oxide film can protect the aluminum foil from corrosion by oxygen, moisture, acid and alkali in the atmosphere, thereby extending the service life of the cable. In addition, the non-magnetic characteristics of aluminum foil prevent it from generating eddy currents in the cable, which can reduce line losses. Aluminum foil Mylar can not only play a shielding role in wires and cables, but also increase the extension performance, flexibility and bending performance of the cable.

[0022] See also Figure 3 The inner lining layer 5 includes an oxygen barrier layer 12, a first buffer layer 13 and a second buffer layer 14. The oxygen barrier layer 12 is located on the inner surface of the inner lining layer 5. The first buffer layer 13 is arranged outside the oxygen barrier layer 12. The second buffer layer 14 is arranged outside the first buffer layer 13. The material of the oxygen barrier layer 12 is halogen-free, low-smoke and highly flame-retardant polyolefin, the material of the first buffer layer 13 is polyester tape, and the material of the second buffer layer 14 is mica tape. The first buffer layer 13 is connected to the oxygen barrier layer 12 and the second buffer layer 14 respectively by gluing.

[0023] The oxygen barrier layer 12 is made by extrusion, and the first buffer layer 13 and the second buffer layer 14 are made by wrapping. The halogen-free, low-smoke, and highly flame-retardant polyolefin has a halogen-free characteristic, that is, it does not release halogen-containing gas when burned. This not only avoids pollution to the environment, but also reduces potential harm to human health. Secondly, the halogen-free, low-smoke, and highly flame-retardant polyolefin has a low smoke characteristic, that is, the amount of smoke generated when burned is very small. This helps to reduce the interference of smoke on people's vision when a fire occurs, and improves the efficiency of personnel evacuation and fire fighting. In addition, this material also has high flame retardant properties, which can effectively prevent or delay the spread of flames along the cable, thereby reducing the degree of damage caused by the fire and reducing damage to valuables and machinery and equipment. At the same time, halogen-free, low-smoke, and highly flame-retardant polyolefins also have high high temperature resistance and can maintain normal operation for a certain period of time under high temperature or even flame barbecue conditions, thereby increasing the service life of the cable. Finally, this material also has excellent electrical and mechanical properties, which can meet the use requirements of cables in various environments and improve the safety and reliability of cables. Polyester materials have excellent insulation properties and can effectively isolate the current inside the cable, prevent electrical safety problems such as leakage and short circuit, and ensure the normal operation of the cable. Polyester has high mechanical strength The polyester material can maintain a certain stability and performance in high and low temperature environments, so that the cable can work normally under extreme temperatures, which broadens the scope of use of the cable. The polyester material is easy to process and form, and can meet various process requirements in the cable manufacturing process, improving production efficiency. The polyester material is a recyclable material that meets environmental protection requirements and is conducive to reducing the pollution to the environment after the cable is discarded. Mica tape is a natural mineral insulating material with extremely high insulation resistance and dielectric strength. It can effectively isolate the conductors in the cable, prevent current leakage and electric shock risks, and ensure the safe operation of the cable. Mica has the characteristics of high temperature resistance and can maintain good stability in high temperature environments. It will not melt or deform due to high temperature. This makes mica an important refractory material in the cable insulation layer, which can maintain the normal operation of the cable in emergency situations such as fires and reduce the damage of fires to the cable system. Mica tape can enhance the mechanical strength of the cable and improve its tensile strength and wear resistance. It can protect the cable from external pressure and physical damage to a certain extent and extend the service life of the cable. Mica has strong stability to chemical substances and can resist the erosion of acid, alkali and other chemical substances, ensuring the stable operation of the cable in various environments.

[0024] See also Figure 4The composite flame retardant layer 7 includes a first flame retardant layer 15, a second flame retardant layer 16 and a third flame retardant layer 17. The first flame retardant layer 15 is located on the inner surface of the composite flame retardant layer 7. The second flame retardant layer 16 is arranged outside the first flame retardant layer 15. The third flame retardant layer 17 is arranged outside the second flame retardant layer 16. The material of the first flame retardant layer 15 is flame retardant polyvinyl chloride, the material of the second flame retardant layer 16 is flame retardant polyethylene, and the material of the third flame retardant layer 17 is flame retardant cross-linked polyethylene.

[0025] The first flame retardant layer 15, the second flame retardant layer 16 and the third flame retardant layer 17 are all made by extrusion, and the flame retardant polyvinyl chloride insulated wire and cable has better flame retardant properties. This wire adopts special flame retardants and plasticizers to make the polyvinyl chloride insulation layer not easy to catch fire when burning, and can effectively slow down the spread of fire. Therefore, the flame retardant polyvinyl chloride insulated wire and cable is safer in fire accidents, which helps to reduce fire losses and risks, and the electrical properties of the flame retardant polyvinyl chloride insulated wire and cable are relatively good. Because it adopts high-quality raw materials and advanced production technology, it has lower resistance and lower dielectric loss factor. This means that the wire has higher current carrying capacity and lower power loss, and can withstand higher voltage and frequency, so it is suitable for various electrical equipment and lines. The structure of the polyvinyl chloride insulated sheathed wire and cable is not complicated, and the installation accessories are convenient, which makes it have a good market space in specific installation and application. At the same time, a very important advantage of using polyvinyl chloride insulated sheathed wire and cable is easy maintenance and low cost. Compared with polyethylene cables, maintenance and installation costs will be reduced by half, which greatly simplifies the cable maintenance process and reduces overall costs. PVC is a polar molecule, and PVC insulated wires and cables have certain flame retardant properties and will not burn so easily. At the same time, the smoke produced by halogen-free low-smoke flame-retardant polyvinyl chloride when burning is low in concentration, highly visible, and less corrosive, which is beneficial to environmental protection and reduces damage to equipment. Flame-retardant polyethylene cables can quickly contain the fire within a local area when burning, reduce the degree of damage caused by the fire, and reduce the problem of spontaneous combustion of the line caused by overheating due to current overload. This helps to reduce the risk of fire and protect people's lives and property. Flame-retardant polyethylene cables have excellent conductivity and heat dissipation, which can effectively reduce resistivity and reduce power loss, making the cable more efficient and stable when transmitting electrical signals. Flame-retardant polyethylene cables use special materials and processes to better protect the metal parts and insulation layers of the cable from fire damage, thereby extending the service life of the cable. Flame-retardant polyethylene cables can not only prevent the spread of fire when a fire occurs, but also ensure the normal operation of the wires, reduce the failure rate of the line, and improve the reliability of the line. The use of flame-retardant polyethylene cables is in compliance with national regulations, especially in places such as building decoration and home decoration, where fire prevention requirements are very strict. The use of this cable can ensure compliance with regulatory requirements and avoid safety hazards caused by non-compliance with standards. Cross-linked polyethylene has excellent heat resistance and can not decompose or carbonize at high temperatures or even below 200°C. The hot use time can reach 40 years and the long-term working temperature can reach 90°C. This significantly improves the current carrying capacity of the cable, enabling it to maintain stable performance in high temperature environments. Cross-linked polyethylene maintains the original good insulation properties of polyethylene, and the insulation resistance is further increased. Its dielectric loss tangent is very small and is not greatly affected by temperature.This ensures that the cable has lower energy loss and higher transmission efficiency when transmitting electrical signals. New chemical bonds are established between macromolecules, and the hardness, stiffness, wear resistance and impact resistance of cross-linked polyethylene are improved. This makes up for the shortcomings of polyethylene being easily cracked by environmental stress, and improves the mechanical strength and durability of the cable. Cross-linked polyethylene has strong acid, alkali and oil resistance, and its combustion products are mainly water and carbon dioxide, which are less harmful to the environment. This meets the requirements of modern fire protection and reduces the pollution of the cable to the environment during use. Due to the excellent performance of cross-linked polyethylene cables, their reliability and failure rate have been significantly improved. This ensures that the cable can maintain stable performance during long-term use and reduces the losses and risks caused by cable failures.

[0026] Working principle: In summary, the material of the oxygen-isolating layer 12 is halogen-free, low-smoke, highly flame-retardant polyolefin, which has a halogen-free characteristic, that is, it will not release halogen-containing gases when burning. This not only avoids pollution to the environment, but also reduces potential harm to human health. Secondly, halogen-free, low-smoke, highly flame-retardant polyolefin has a low smoke characteristic, that is, the amount of smoke generated during combustion is very small. This helps to reduce the interference of smoke on people's vision when a fire occurs, and improve the efficiency of personnel evacuation and fire fighting. The material of the first buffer layer 13 is polyester tape, which has high mechanical strength and can withstand external forces such as stretching and bending generated by the cable during use, ensuring the structural stability and integrity of the cable. The polyester material can maintain a certain stability and performance in high and low temperature environments, so that the cable can work normally even at extreme temperatures, broadening the scope of use of the cable. The material of the second buffer layer 14 is mica tape, which can enhance the mechanical strength of the cable and improve its tensile strength and wear resistance. It can protect the cable from external pressure and physical damage to a certain extent, and extend the service life of the cable. Mica has strong stability to chemical substances, and can resist the corrosion of acid, alkali and other chemical substances, and ensure the stable operation of the cable in various environments. The material of the first flame retardant layer 15 is flame retardant polyvinyl chloride.

[0027] It has better flame retardant properties. It is not easy to catch fire when burning, and can effectively slow down the spread of fire. Therefore, flame retardant polyvinyl chloride insulated wires and cables are safer in fire accidents, help reduce fire losses and risks, have higher current carrying capacity and lower power loss, can withstand higher voltages and frequencies, and are therefore suitable for various electrical equipment and lines. The third flame retardant layer 17 is made of flame retardant cross-linked polyethylene, which can quickly contain the fire in a local area when burning, reduce the degree of damage caused by the fire, and reduce the problem of spontaneous combustion of the line caused by current overload heating. This helps to reduce the risk of fire and protect people's lives and property. The flame retardant polyethylene cable has excellent conductivity and heat dissipation, can effectively reduce resistivity, reduce power loss, and make the cable more efficient and stable when transmitting electrical signals.

[0028] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A halogen-free, low-smoke, flame-retardant power cable, comprising a cable core (6), Features: The cable core (6) comprises a wire core (3) and a filling layer (4); four wire cores (3) are arranged in a ring shape inside the cable core (6); a filling layer (4) is arranged between the wire cores (3); the wire core (3) comprises a conductor (1) and a composite insulating shielding layer (2); the conductor (1) is located inside the wire core (3), and the composite insulating shielding layer (2) is located outside the conductor (1); an inner lining layer (5) is arranged outside the cable core (6); a composite flame retardant layer (7) is arranged outside the inner lining layer (5); a steel wire armor layer (8) is arranged outside the composite flame retardant layer (7); and an outer sheath (9) is arranged outside the steel wire armor layer (8).

2. A halogen-free, low-smoke, flame-retardant power cable according to claim 1, Features: The composite insulating shielding layer (2) comprises an insulating layer (10) and a shielding layer (11); the insulating layer (10) is located on the inner surface of the composite insulating shielding layer (2), and the shielding layer (11) is located on the outer surface of the composite insulating shielding layer (2); the insulating layer (10) is made of silicone rubber, and the shielding layer (11) is made of aluminum foil; the insulating layer (10) and the shielding layer (11) are connected by gluing.

3. A halogen-free, low-smoke, flame-retardant power cable according to claim 1, Features: The inner lining layer (5) comprises an oxygen barrier layer (12), a first buffer layer (13) and a second buffer layer (14); the oxygen barrier layer (12) is located on the inner surface of the inner lining layer (5); the first buffer layer (13) is arranged outside the oxygen barrier layer (12); the second buffer layer (14) is arranged outside the first buffer layer (13); the material of the oxygen barrier layer (12) is halogen-free, low-smoke and highly flame-retardant polyolefin; the material of the first buffer layer (13) is polyester tape; the material of the second buffer layer (14) is mica tape; the first buffer layer (13) is connected to the oxygen barrier layer (12) and the second buffer layer (14) respectively by gluing.

4. A halogen-free, low-smoke, flame-retardant power cable according to claim 1, Features: The composite flame retardant layer (7) comprises a first flame retardant layer (15), a second flame retardant layer (16) and a third flame retardant layer (17); the first flame retardant layer (15) is located on the inner surface of the composite flame retardant layer (7); the second flame retardant layer (16) is arranged outside the first flame retardant layer (15); the third flame retardant layer (17) is arranged outside the second flame retardant layer (16); the first flame retardant layer (15) is made of flame retardant polyvinyl chloride, the second flame retardant layer (16) is made of flame retardant polyethylene, and the third flame retardant layer (17) is made of flame retardant cross-linked polyethylene.

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