Flame-retardant crosslinked polyethylene insulated cable
Patent Information
- Application Number
- CN202522362797.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-07
- Publication Date
- 2026-09-29
- Estimated Expiration
- 2035-11-07
AI Technical Summary
[0004]为了弥补以上不足，本实用新型提供了一种阻燃交联聚乙烯绝缘电缆，旨在改善传统电缆在高温、明火或机械摩擦等恶劣环境下，易因阻燃效果不足引发火灾蔓延的问题
本实用新型的有益效果是：本实用新型通过上述设计得到的一种阻燃交联聚乙烯绝缘电缆，使用时高效阻燃性能：通过内阻燃组件中的内阻燃层（低添加量纳米阻燃交联聚乙烯层）、中部阻燃层（膨胀型阻燃层）、外阻燃层（阻燃弹性体过渡层），与防护阻燃组件中的纳米阻燃层形成多层级阻燃体系，梯度阻隔火焰与热量传递，显著提升电缆在明火或高温环境下的抗燃烧能力，降低火灾风险。
Smart Images
Figure CN224816896U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of flame-retardant cables, and more specifically, to a flame-retardant cross-linked polyethylene insulated cable. Background Technology
[0002] In scenarios such as power transmission, building wiring, and industrial equipment connection, the flame retardant properties, insulation properties, and mechanical protection capabilities of cables are directly related to electrical safety and equipment reliability.
[0003] While traditional cross-linked polyethylene (XLPE) insulated cables possess certain insulation properties, they are susceptible to fire spread due to insufficient flame retardancy in harsh environments such as high temperatures, open flames, or mechanical friction. Furthermore, their inadequate abrasion resistance and tensile strength can lead to insulation layer damage, causing risks such as leakage and short circuits. In enclosed spaces like high-rise buildings and underground tunnels, once a fire starts, it spreads rapidly and is difficult to extinguish. In industrial workshops and other environments with frequent mechanical collisions, the cable sheath is prone to wear, shortening its service life and increasing maintenance costs. Therefore, inventing a flame-retardant XLPE insulated cable to address these problems has become a pressing issue for those skilled in the art. Utility Model Content
[0004] To overcome the above shortcomings, this utility model provides a flame-retardant cross-linked polyethylene insulated cable, which aims to improve the problem that traditional cables are prone to fire spread due to insufficient flame-retardant effect in harsh environments such as high temperature, open flame or mechanical friction.
[0005] This utility model is achieved as follows: a flame-retardant cross-linked polyethylene insulated cable, comprising... The cable body 100 includes an inner flame-retardant component 110, and a protective flame-retardant component 120 is sleeved on the outside of the inner flame-retardant component 110. The inner flame-retardant component 110 includes a conductor 111, and an insulation layer 112 is sleeved on the outside of the conductor 111. The protective flame-retardant component 120 includes a nano flame-retardant layer 121, which is sleeved on the outside of the insulation layer 112. A wear-resistant insulation layer 123 is sleeved on the outside of the nano flame-retardant layer 121, and a protective layer is provided on the outside of the wear-resistant insulation layer 123. Strip 124, the protective strip 124 is spirally arranged on the outside of the wear-resistant insulation layer 123; through the inner flame retardant layer 113 (low-addition amount of nano flame retardant cross-linked polyethylene layer), the middle flame retardant layer 114 (expansion type flame retardant layer) and the outer flame retardant layer 115 (flame retardant elastomer transition layer) in the inner flame retardant component, a multi-level flame retardant system is formed with the nano flame retardant layer 121 in the protective flame retardant component, which gradient blocks the transfer of flame and heat, significantly improves the cable's resistance to combustion in open flame or high temperature environments, and reduces the risk of fire.
[0006] In a preferred embodiment of this utility model, The beneficial effects of this utility model are as follows: The flame-retardant cross-linked polyethylene insulated cable obtained by the above design has high flame-retardant performance when in use: through the inner flame-retardant layer (low-addition amount of nano flame-retardant cross-linked polyethylene layer), the middle flame-retardant layer (expansion type flame-retardant layer), and the outer flame-retardant layer (flame-retardant elastomer transition layer) in the inner flame-retardant component, a multi-level flame-retardant system is formed with the nano flame-retardant layer in the protective flame-retardant component, which gradient blocks the transfer of flame and heat, significantly improves the cable's resistance to combustion in open flame or high-temperature environments, and reduces the risk of fire.
[0007] Excellent mechanical protection: The spiral tape is wound at a specific angle and overlap rate, combined with the arc-shaped raised protective strip on the outside of the wear-resistant insulation layer, which enhances the cable's tensile strength, friction resistance and impact resistance, reduces insulation failure caused by mechanical damage and extends service life.
[0008] Stable insulation performance: The insulation layer, wear-resistant insulation layer and each flame-retardant layer have good insulation properties. The multi-layer structure works together to ensure the insulation stability of the cable in complex environments and reduce the probability of leakage and short circuit.
[0009] Structural rationality: The design of multiple conductors combined with the inner flame-retardant layer improves conductivity and flame-retardant uniformity; the spiral structure of the spiral strip and protective strip ensures the protective effect without affecting the bending flexibility of the cable, adapting to the needs of different laying scenarios. Attached Figure Description
[0010] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.
[0011] Figure 1 This is a schematic diagram of one side of the structure provided by an embodiment of the present invention; Figure 2 This is a schematic diagram of another side of the structure provided for an embodiment of the present invention; Figure 3 A schematic diagram of the protective flame-retardant component structure provided for an embodiment of this utility model; Figure 4 A schematic diagram of the internal flame-retardant component provided for an embodiment of this utility model.
[0012] In the diagram: 100 - Cable body; 110 - Inner flame retardant component; 111 - Conductor; 112 - Insulation layer; 113 - Inner flame retardant layer; 114 - Middle flame retardant layer; 115 - Outer flame retardant layer; 120 - Protective flame retardant component; 121 - Nano flame retardant layer; 122 - Spiral ribbon; 123 - Wear-resistant insulation layer; 124 - Protective strip. Detailed Implementation
[0013] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0014] Please see Figure 1 and Figure 2 This utility model provides a technical solution: a flame-retardant cross-linked polyethylene insulated cable, comprising... The cable body 100 includes an inner flame-retardant component 110, and a protective flame-retardant component 120 is sleeved on the outside of the inner flame-retardant component 110. The inner flame-retardant component 110 includes a conductor 111, and an insulation layer 112 is sleeved on the outside of the conductor 111. The protective flame-retardant component 120 includes a nano flame-retardant layer 121, which is sleeved on the outside of the insulation layer 112. A wear-resistant insulation layer 123 is sleeved on the outside of the nano flame-retardant layer 121, and a protective strip is provided on the outside of the wear-resistant insulation layer 123. 124. The protective strip 124 is spirally arranged on the outside of the wear-resistant insulation layer 123. Through the inner flame retardant layer 113 (low-addition amount of nano flame retardant cross-linked polyethylene layer), the middle flame retardant layer 114 (expansion type flame retardant layer), and the outer flame retardant layer 115 (flame retardant elastomer transition layer) in the inner flame retardant component 110, a multi-level flame retardant system is formed with the nano flame retardant layer 121 in the protective flame retardant component. This system provides gradient isolation of flame and heat transfer, significantly improving the cable's resistance to combustion in open flame or high-temperature environments and reducing the risk of fire.
[0015] Conductor 111 uses a high-purity copper core, which improves conductivity by more than 15% and reduces heat loss during current transmission. Insulation layer 112 is made of cross-linked polyethylene with a temperature resistance rating of 90℃, which can maintain stable insulation performance in high-temperature environments and reduce the risk of insulation failure due to high-temperature aging.
[0016] Please see Figure 3 and Figure 4An inner flame-retardant layer 113 is provided on the outside of the insulation layer 112. The conductor 111 and the insulation layer 112 are arranged in multiple strands within the inner flame-retardant layer 113. The inner flame-retardant layer 113 is a low-addition amount of nano-flame-retardant cross-linked polyethylene layer. The multiple conductors 111 are distributed in a bundle, and the diameter of each strand is controlled at 0.5-1mm, so that the current distribution is more uniform and the skin effect is reduced. At the same time, the amount of nano-flame retardant added in the inner flame-retardant layer 113 is only 3%-5%, which ensures the flame-retardant effect while avoiding the decrease in the mechanical properties of the material due to excessive addition, so that the inner flame-retardant layer 113 still maintains good flexibility.
[0017] The inner flame-retardant layer 113 is surrounded by a middle flame-retardant layer 114, which is an intumescent flame-retardant layer. The middle flame-retardant layer 114 is composed of ammonium polyphosphate, melamine, and pentaerythritol in a ratio of 3:1:1. When exposed to fire, it can expand to 5-8 times its original volume, forming a dense honeycomb-like char layer. This effectively blocks the transfer of heat and oxygen inward, providing an additional flame-retardant barrier for the inner flame-retardant component 110 and delaying the time it takes for the conductor 111 to be damaged by high temperature.
[0018] The outer part of the middle flame-retardant layer 114 includes an outer flame-retardant layer 115, which is a flame-retardant elastomer transition layer. The outer flame-retardant layer 115 is made of flame-retardant TPU elastomer with a Shore hardness of 80A. It has good flame-retardant properties and can also buffer the damage to the middle flame-retardant layer 114 from external impacts through its own elasticity. At the same time, its smooth surface can reduce friction with the outer nano flame-retardant layer 121 and ensure the structural stability of each layer.
[0019] The nano flame retardant layer 121 is wrapped around the outside of the outer flame retardant layer 115. The nano flame retardant layer 121 is uniformly coated on the surface of the outer flame retardant layer 115. The nano flame retardant layer 121 adopts a composite system of nano magnesium hydroxide and nano aluminum hydroxide, with a coating thickness of 0.1-0.2mm. The small size effect of the nanoparticles enables them to uniformly fill the tiny pores on the surface of the outer flame retardant layer 115, improving the overall flame retardant sealing performance. Moreover, the coating process is simple and can reduce production costs.
[0020] A spiral band 122 is provided on the outside of the nano flame retardant layer 121. The spiral band 122 is spirally wound around the outside of the nano flame retardant layer 121. The spiral band 122 is made of glass fiber reinforced polyvinyl chloride with a tensile strength of 30MPa. Its spiral winding structure can disperse the axial tensile force on the cable and avoid structural tearing caused by excessive local stress. At the same time, the glass fiber component improves the high temperature resistance of the spiral band 122 and can maintain structural stability at 150℃.
[0021] The width of the spiral strip 122 is 1 / 3 of the diameter of the cable body 100. The spiral strip 122 is wound at a 45-degree angle, and the overlap rate of the spiral strip 122 is controlled at 20%. This parameter setting ensures that the spiral strip 122 can fully cover and protect the nano flame retardant layer 121 without causing the overall diameter of the cable to be too large due to excessive overlap, thus saving installation space. In addition, the 45-degree angle winding direction is compatible with the common bending direction of the cable, reducing the stress concentration of the spiral strip 122 when bending.
[0022] The spiral strip 122 is sleeved with a wear-resistant insulating layer 123, and the protective strip 124 and the wear-resistant insulating layer 123 are integrally set. The wear-resistant insulating layer 123 is made of ultra-high molecular weight polyethylene, which has more than 5 times the wear resistance of ordinary polyethylene. The integrally formed protective strip 124 has a high connection strength with the wear-resistant insulating layer 123 and is not easy to fall off. It can maintain the local reinforcement protection of the wear-resistant insulating layer 123 for a long time.
[0023] The protective strip 124 has a 2-3mm arc-shaped protrusion on the outside of the wear-resistant insulation layer 123. The arc-shaped protrusion design allows the protective strip 124 to disperse pressure through the arc surface when it comes into contact with external objects, reducing local wear. The 2-3mm protrusion height can ensure the protective effect without causing additional resistance to the cable during laying due to excessive protrusion, which facilitates construction and installation.
[0024] Working principle: In the inner flame-retardant component 110, the conductor 111 transmits current, and its outer insulation layer 112 provides basic insulation; the multiple conductors 111 and the insulation layer 112 are wrapped by the inner flame-retardant layer 113, which initially blocks heat through nano flame-retardant components; the middle flame-retardant layer 114 expands when exposed to high temperature to form a heat-insulating char layer, further preventing the flame from spreading inward; the outer flame-retardant layer 115 serves as a transition layer, combining flame retardancy and elasticity, and buffering the stress of the inner and outer layers.
[0025] In the protective flame-retardant component 120, a nano flame-retardant layer 121 is uniformly coated on the outside of the outer flame-retardant layer 115 to enhance the surface flame-retardant effect; a spiral ribbon 122 is wound around the outside of the nano flame-retardant layer 121 at a 45-degree angle and with a 20% overlap rate to enhance structural strength and tensile strength; a wear-resistant insulating layer 123 wraps around the spiral ribbon 122 to provide outer insulation and wear resistance; and an integrally set protective strip 124 (arc-shaped protrusions of 2-3mm) is spirally distributed to preferentially contact external forces when the cable is subjected to friction or collision, protecting the inner structure, and ultimately achieving overall high-efficiency flame retardancy, stable insulation and mechanical protection.
[0026] It should be noted that the specific model and specifications in this solution need to be selected and determined based on the actual specifications of the device. The specific selection and calculation method adopts the existing technology in this field, so it will not be described in detail here.
[0027] The power supply and its principle in this solution are clear to those skilled in the art, and will not be described in detail here.
[0028] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A flame-retardant cross-linked polyethylene insulated cable, characterized in that, include The cable body includes an inner flame-retardant component, and a protective flame-retardant component is sleeved on the outside of the inner flame-retardant component. The inner flame-retardant component includes a conductor, and an insulating layer is sleeved on the outside of the conductor. The protective flame-retardant component includes a nano flame-retardant layer, which is sleeved on the outside of the insulating layer. A wear-resistant insulating layer is sleeved on the outside of the nano flame-retardant layer, and a protective strip is provided on the outside of the wear-resistant insulating layer. The protective strip is spirally arranged on the outside of the wear-resistant insulating layer. An inner flame-retardant layer is provided on the outside of the insulating layer. The conductor and the insulating layer are provided with multiple strands within the inner flame-retardant layer. The inner flame-retardant layer is a low-addition-content nano-flame-retardant cross-linked polyethylene layer. A middle flame-retardant layer is sleeved on the outside of the inner flame-retardant layer. The middle flame-retardant layer is an intumescent flame-retardant layer. The outside of the middle flame-retardant layer includes an outer flame-retardant layer, which is a flame-retardant elastomer transition layer.
2. The flame-retardant cross-linked polyethylene insulated cable as described in claim 1, characterized in that: The nano flame-retardant layer is wrapped around the outside of the outer flame-retardant layer, and the nano flame-retardant layer is uniformly coated on the surface of the outer flame-retardant layer.
3. The flame-retardant cross-linked polyethylene insulated cable as described in claim 2, characterized in that: The outer surface of the nano flame-retardant layer is provided with a spiral band, which is spirally wound around the outer surface of the nano flame-retardant layer.
4. The flame-retardant cross-linked polyethylene insulated cable as described in claim 3, characterized in that: The width of the spiral strip is 1 / 3 of the diameter of the cable body, the spiral strip is wound at a 45-degree angle, and the overlap rate of the spiral strip is controlled at 20%.
5. A flame-retardant cross-linked polyethylene insulated cable as described in claim 4, characterized in that: The spiral band is fitted with a wear-resistant insulating layer, and the protective strip and the wear-resistant insulating layer are integrally formed.
6. The flame-retardant cross-linked polyethylene insulated cable as described in claim 5, characterized in that: The protective strip is an arc-shaped protrusion of 2-3mm on the outside of the wear-resistant insulating layer.