High-flame-retardant tensile double-layer shielding anti-interference control cable

Abstract

The utility model discloses a high-flame-retardant tensile double-layer shielding anti-interference control cable, which comprises a PEEK reinforcing core positioned in the center of the cable, and six insulating wire cores which are arranged around the PEEK reinforcing core and are twisted together to form a cable core; gaps of the cable core are filled with high-flame-retardant filling ropes; a flame-retardant heat-resistant polypropylene pipe is arranged outside the cable core and is used as an inner protective layer; a semi-conductive water-blocking shielding tape, an FRV ultra-light fire-resistant composite material flame-retardant layer and a graphene composite epoxy resin shielding layer are sequentially arranged outside the inner protection layer; a woven reinforcing layer is arranged outside the graphene composite epoxy resin shielding layer, a high-silica fiber belt flame-retardant layer is arranged outside the woven reinforcing layer, and a high-tear-resistant mixed silicone rubber outer sheath resistant to high temperature of 180 DEG C is arranged outside the high-silica fiber belt flame-retardant layer; the flame-retardant fireproof cable has excellent flame-retardant fireproof performance, shielding performance and tensile property, can ensure normal operation of a line after long-time high-temperature flame burning, and greatly prolongs the service life of the cable.

Description

Technical Field

[0001] The utility model relates to the field of power cables, and particularly relates to a highly flame-retardant and tensile double-layer shield anti-interference control cable. Background Art

[0002] A control cable is a power connection line that directly transmits electric energy from the power distribution point of an electric power system to various electrical equipment and appliances. The voltage of the control cable is mainly 450 / 750V, and it can be laid in a tunnel or a cable trench. It belongs to the cable for electrical equipment. Its structure and constituent materials are relatively complex. According to the special requirements of the use temperature and working environment, there are various types of constituent materials for each structure of the control cable. With the rapid development of informatization such as artificial intelligence and the Internet of Things, the demand for automated and intelligent devices has also been continuously increasing, which has greatly expanded the market for control cables.

[0003] Nowadays, the total production value of China's control cable industry has exceeded that of many developed countries, making China a world-leading cable manufacturing country. And with the continuous development of China's wire and cable industry, more and more related emerging enterprises are emerging. While competing with each other, these enterprises have effectively promoted the innovation and diversification of cable production technologies, and at the same time increased the rate of product upgrading, injecting more fresh blood into the entire cable industry, thereby greatly improving the overall technology and level of the industry and laying a good foundation for future development. Due to the advent of the information age and the popularization of electronic products, the domestic demand for cables is increasing, which provides a huge market for all cable products including control cables. And this huge market has also attracted the attention of foreign related advanced industries. Domestic enterprises can continuously optimize their own products by learning from excellent foreign products, greatly improving the deficiencies in existing products, so as to produce more competitive cable products, providing excellent technical support for China's power industry, communication industry, land and sea transportation industry, etc. At the same time, the continuous growth of the demand for cables in these industries will also actively promote the rapid development of the cable industry.

[0004] The shielding performance of existing control cables is relatively average, and at the same time, the flame-retardant and fire-resistant performance of the materials is poor, and they cannot withstand fire for a long time. In the case of combustibles in the surrounding environment, the heat insulation performance is poor, and it cannot play a role in high-temperature protection, resulting in damage to the cable and causing danger. At the same time, the mechanical strength and tensile performance of the cable do not meet the standards. Therefore, it is very necessary to research and develop a highly flame-retardant and tensile double-layer shield anti-interference control cable to improve the flame-retardant and fire-proof performance, shielding performance and tensile property of existing control cables. Content of the Utility Model

[0005] In order to solve the problems of general shielding performance, poor fire-resistant performance and tensile performance of existing control cables, the utility model provides a highly flame-retardant and tensile double-layer shield anti-interference control cable.

[0006] To achieve the above object, the utility model provides a highly flame-retardant and tensile double-layer shielded anti-interference control cable, which includes a PEEK reinforcing core located at the center of the cable. Six insulated wire cores are arranged around the PEEK reinforcing core and are jointly stranded into a cable core; a highly flame-retardant filling rope is filled in the void of the cable core; a flame-retardant and heat-resistant polypropylene tube is provided outside the cable core as an inner sheath; a semiconductive water-resistant shielding tape, an FRV ultra-light fire-resistant composite material flame-retardant layer, and a graphene composite epoxy resin shielding layer are sequentially provided outside the inner sheath; a braided reinforcing layer is provided outside the graphene composite epoxy resin shielding layer, a high-silica fiber tape flame-retardant layer is provided outside the braided reinforcing layer, and a high-temperature-resistant 180°C high tear-resistant type mixed silicone rubber outer sheath is provided outside the high-silica fiber tape flame-retardant layer; an impact-resistant mixed wire plain woven net is provided between the high-silica fiber tape flame-retardant layer and the high-temperature-resistant 180°C high tear-resistant type mixed silicone rubber outer sheath.

[0007] Further, the insulated wire core is composed of a conductor and a cross-linked polyethylene insulating layer extruded outside the conductor.

[0008] Further, the conductor adopts a Class 2 stranded copper conductor conforming to the standard of GB / T3956-2008.

[0009] Further, the semiconductive water-resistant shielding tape includes a base material and a semiconductive water-resistant glue coated on the base material, and the base material is jointly woven by copper wires and polyacrylonitrile-based carbon fiber wires.

[0010] Further, the fireproof insulated wire core includes a conductor. After a PTFE tetrafluoro film tape is wound around the conductor, a silicone rubber insulating layer is extruded outside the PTFE tetrafluoro film tape.

[0011] Further, the braided reinforcing layer is woven by polyacrylonitrile-based carbon fiber wires.

[0012] Further, the impact-resistant mixed wire plain woven net is formed by mixing and weaving thick Kevlar wires and thick stainless steel wires.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0014] 1. The cable core of the utility model is provided with a PEEK reinforcing core, which has rigidity and flexibility. Especially, its anti-fatigue property under alternating stress is very prominent, comparable to alloy materials, and has self-extinguishing property. Even without adding any flame retardants, it can reach the 94V-0 level of the UL standard, making the cable have excellent properties such as high mechanical strength and tensile performance, and increasing the overall strength and tensile performance of the cable.

[0015] 2. In the present utility model, a flame-retardant and heat-resistant polypropylene tube is provided outside the cable core as an inner sheath layer. Compared with ordinary MPP tubes, it has higher heat resistance, exceeding 60 degrees Celsius, higher tensile strength, and more importantly, it has flame-retardant and self-extinguishing functions, which can better protect the cable core.

[0016] 3. The present utility model is provided with an internal and external double shielding structure, enabling the cable to be used in a high-efficiency electric field shielding environment.

[0017] 4. A FRV ultra-light fire-resistant composite material flame-retardant layer is provided between the two shielding layers in the present utility model. It can be flame-retarded for 1.5 hours at +1100 °C without burning through, and the material has very little dimensional expansion when encountering fire, greatly increasing the flame-retardant and high-temperature resistance performance of the cable.

[0018] 5. The braided reinforcement layer of the present utility model is woven from polyacrylonitrile-based carbon fiber filaments, which are formed through several stages such as pre-oxidation and carbonization of polypropylene spinning. It has the characteristics of high strength, high toughness, light weight, high temperature resistance, corrosion resistance, excellent electrical properties, etc., and has strong compressive performance, while also further enhancing the strength and mechanical properties of the cable.

[0019] 6. A high-silica fiber tape flame-retardant layer is provided in the present utility model, forming an internal and external double flame-retardant structure with the FRV ultra-light fire-resistant composite material flame-retardant layer. It can maintain good strength and elasticity for a long time at 1000 °C, continuously withstand a temperature of 1000 °C, and briefly withstand a temperature of 1400 °C. It has a low thermal conductivity, good resistance to high thermal shock, is inert to most chemicals, has good corrosion resistance to compounds, corrosive minerals, and weakly alkaline molten alloys at high temperatures, and can work normally and continuously under high heat and strong radiation conditions. Cooperating with the outer sheath greatly increases the flame-retardant and high-temperature resistance of the cable and extends the service life of the cable.

[0020] 7. An impact-resistant mixed-wire plain weave net is provided in the present utility model to enhance the impact resistance of the cable. The stainless steel wire has strong rigidity and the Kevlar wire has flexibility, taking into account improving the mechanical strength, impact resistance, and bending resistance of the cable. When the cable is slightly impacted, it can effectively inhibit the damage caused by external forces to the internal cores and shielding layers of the cable core, ensure the mechanical strength and electrical characteristics of the cable, increase safety and reliability, extend the service life, and have better durability.

[0021] 8. The high-temperature resistant 180°C high tear-resistant type silicone rubber outer sheath is adopted in the utility model. The long-term working temperature reaches 180°C. Compared with the cables using thermoplastic elastomers with a long-term working temperature of 70°C or 90°C commonly, the working temperature is increased by more than 110°C. In this way, for transmitting the same current, only a smaller cable cross-section is needed, which can effectively reduce the weight of the cable and thus reduce the weight of the whole vehicle. At the same time, this silicone rubber material has high tear resistance and flexibility, meeting the requirement of long-term bending use without cracking. Generally speaking, the heat resistance and long-term working safety and reliability of the cable are greatly improved compared with the conventional thermoplastic elastomer cables.

[0022] In summary, the utility model has excellent flame retardant and fireproof performance, shielding performance and tensile property, has good corrosion resistance to compounds, corrosive minerals and weakly alkaline molten alloys at high temperatures, can work normally and continuously under high heat and strong radiation conditions, and can ensure the normal operation of the circuit under long-time high-temperature flame burning, greatly improving the service life of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of the utility model;

[0024] Figure 2 is a schematic structural diagram of the semiconductive resistive water shielding tape of the utility model;

[0025] Figure 3 is a schematic structural diagram of the impact-resistant mixed wire plain weave net of the utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following further clarifies the utility model in conjunction with the drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the utility model and not to limit the scope of the utility model. After reading the utility model, various equivalent modifications made by those skilled in the art to the utility model all fall within the scope defined by the appended claims of this application.

[0027] As Figures 1-3 shown, the utility model provides a high flame retardant and tensile double-layer shielded anti-interference control cable, including a PEEK strengthening core 1 located at the center of the cable, which enables the cable to have excellent properties such as high mechanical strength and tensile property, and increases the overall strength and tensile property of the cable; then six insulated wire cores are arranged around the PEEK strengthening core and are jointly stranded into a cable core;

[0028] It should be noted here that: the insulated wire core is composed of a conductor 2 and a cross-linked polyethylene insulating layer 3 extruded outside the conductor; the conductor adopts the Class 2 stranded copper conductor in line with the standard of GB / T3956-2008.

[0029] At the gaps of the cable core, high-flame-retardant filling ropes 4 are filled to fill the internal gaps of the cable, maintaining the roundness and structural stability of the cable. In addition, the filling ropes can also improve the flame retardancy, tensile resistance, and compressive resistance of the cable, and extend the service life of the cable.

[0030] Outside the cable core, there is a flame-retardant and heat-resistant polypropylene tube 5, which serves as the inner sheath. Compared with ordinary MPP tubes, it has higher heat resistance, exceeding 60 degrees Celsius, higher tensile strength, and more importantly, it has flame-retardant and self-extinguishing functions, better protecting the cable core.

[0031] Outside the inner sheath, there are a semiconductive water-blocking shielding tape 6, an FRV ultra-light fire-resistant composite flame-retardant layer 7, and a graphene composite epoxy resin shielding layer 8 in sequence. It can absorb and reflect external electromagnetic signals to the environment, has excellent electromagnetic shielding performance, can effectively reduce electromagnetic interference, and greatly increases the shielding anti-interference performance of the cable.

[0032] It should be noted here that: the semiconductive water-blocking shielding tape 6 includes a base material and a semiconductive water-blocking glue 63 laminated on the base material. The base material is jointly woven by copper wires 61 and polyacrylonitrile-based carbon fiber filaments 62. As the inner shield of the cable, it can shield the electric field while blocking water, forming an internal and external double shielding with the graphene composite epoxy resin shielding layer as the outer shield of the cable, enabling the cable to be used in a high-efficiency electric field shielding environment. In addition, an FRV ultra-light fire-resistant composite flame-retardant layer 7 is provided between the two shielding layers. It can be flame-retardant for 1.5 hours at +1100°C without burning through, and the size of this material expands very little when encountering fire, greatly increasing the flame retardancy and high-temperature resistance of the cable.

[0033] Outside the graphene composite epoxy resin shielding layer 8, there is a braided strengthening layer 9, which is woven by polyacrylonitrile-based carbon fiber filaments. It is formed by polypropylene spinning through several stages such as pre-oxidation and carbonization. It has the characteristics of high strength, high toughness, light weight, high temperature resistance, corrosion resistance, excellent electrical properties, etc., and has strong compressive resistance. At the same time, it further enhances the strength and mechanical properties of the cable.

[0034] Outside the braided strengthening layer 9, there is a high-silica fiber tape flame-retardant layer 10, forming an internal and external double flame-retardant structure with the FRV ultra-light fire-resistant composite flame-retardant layer. It can maintain good strength and elasticity for a long time at 1000°C, continuously withstand a temperature of 1000°C, and briefly withstand a temperature of 1400°C. Its thermal conductivity is low, it has good resistance to high thermal shock, is inert to most chemicals, has good corrosion resistance to compounds, corrosive minerals, and weakly alkaline molten alloys at high temperatures, and can work normally and continuously under high heat and strong radiation conditions. Cooperating with the outer sheath, it greatly increases the flame retardancy and high-temperature resistance of the cable and extends the service life of the cable.

[0035] Outside the flame-retardant layer 10 of the high-silica fiber tape, there is a high-temperature-resistant 180°C high tear-resistant type mixed silicone rubber outer sheath 12, which has high tear resistance and flexibility, can meet the long-term bending use without cracking; Generally speaking, the heat resistance and long-term working safety and reliability of the cable are greatly improved compared with the conventional thermoplastic elastomer cable.

[0036] There is an impact-resistant mixed wire plain weave net 11 between the high-silica fiber tape flame-retardant layer and the high-temperature-resistant 180°C high tear-resistant type mixed silicone rubber outer sheath. It is woven into a net by thick Kevlar wires 111 and thick stainless steel wire mixtures 112. The wire diameter of the thick Kevlar wires does not exceed 60% of the wire diameter of the thick stainless steel wires, enhancing the impact resistance of the cable. The stainless steel wires have strong rigidity and the flexibility of the Kevlar wires, taking into account improving the mechanical strength, impact resistance and bending resistance of the cable. When the cable is slightly impacted, it can effectively inhibit the damage caused by external force to each wire core and shielding layer inside the cable core, ensuring the mechanical strength and electrical characteristics of the cable, increasing safety and reliability, extending the service life, and having better durability.

[0037] In summary, through the design of the above structure, the utility model simultaneously has excellent flame-retardant and fire-proof performance, shielding performance and tensile property, has good corrosion resistance to compounds, corrosive minerals and weakly alkaline molten alloys at high temperatures, can work normally and continuously under high heat and strong radiation conditions, and can ensure the normal operation of the circuit under long-term high-temperature flame burning, greatly improving the service life of the cable.

[0038] The specific application ways of the utility model are numerous. The above are only the preferred embodiments of the utility model. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the utility model, several improvements can be made, and these improvements should also be regarded as the protection scope of the utility model.

Claims

1. A highly flame-retardant and tensile-resistant double-layer shielded anti-interference control cable, characterized in that: It comprises a PEEK reinforcing core located at the center of the cable, with six insulating cores arranged around the PEEK reinforcing core as the center and twisted together to form a cable core; a highly flame-retardant filling rope is filled in the gaps of the cable core; a flame-retardant and heat-resistant polypropylene tube is arranged outside the cable core as an inner protective layer; a semiconductor water-resistant shielding tape, an FRV ultra-light fire-resistant composite material flame-retardant layer, and a graphene composite epoxy resin shielding layer are arranged in sequence outside the inner protective layer; a braided reinforcing layer is arranged outside the graphene composite epoxy resin shielding layer, a high-silica fiber belt flame-retardant layer is arranged outside the braided reinforcing layer, and a high-temperature resistant 180°C high-tear-resistant mixed silicone rubber outer sheath is arranged outside the high-silica fiber belt flame-retardant layer; an impact-resistant mixed wire flat woven mesh is arranged between the high-silica fiber belt flame-retardant layer and the high-temperature resistant 180°C high-tear-resistant mixed silicone rubber outer sheath.

2. A highly flame-retardant and tensile-resistant double-layer shielded anti-interference control cable according to claim 1, characterized in that: The insulated wire core is composed of a conductor and a cross-linked polyethylene insulation layer extruded outside the conductor.

3. A highly flame-retardant and tensile-resistant double-layer shielded anti-interference control cable according to claim 2, characterized in that: The conductor is a second-class stranded copper conductor in accordance with the GB / T3956-2008 standard.

4. The highly flame-retardant and tensile-resistant double-layer shielded anti-interference control cable according to claim 1, characterized in that: The semiconductive water-shielding tape comprises a substrate and a semiconductive water-shielding adhesive coated on the substrate, wherein the substrate is woven from copper wires and polyacrylonitrile-based carbon fiber wires.

5. The highly flame-retardant and tensile-resistant double-layer shielded anti-interference control cable according to claim 1, characterized in that: The braided reinforcement layer is braided with polyacrylonitrile-based carbon fiber filaments.

6. The highly flame-retardant and tensile-resistant double-layer shielded anti-interference control cable according to claim 1, characterized in that: The impact-resistant mixed-wire flat woven mesh is formed by weaving thick Kevlar wires and thick stainless steel wires.

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