Low-release flame-retardant cable

Abstract

The utility model provides a low-release flame-retardant cable. The low-release flame-retardant cable comprises a cable core and a sheath annularly arranged on the outer side of the cable core. Firstly, the flame-retardant filling layer is arranged between the cable cores, so that the flame-retardant effect of the whole cable is enhanced; secondly, the outer flame-retardant layer of the cable adopts two layers of flame-retardant winding films, and the two layers of flame-retardant winding films are tightly attached to the outer side of the outer shielding layer in a spiral winding and annular winding mode, so that the thickness and density of the outer flame-retardant layer are increased, the overall flame-retardant performance of the cable is effectively improved through a multi-layer winding and staggered structure, and even under extreme conditions, the flame-retardant performance of the cable is effectively improved. The cable also can maintain an excellent flame-retardant effect, so that the fire risk is reduced; and thirdly, the heat dissipation layer has high heat conduction performance, so that heat generated inside the cable can be quickly transferred to the outside, and the working temperature of the cable is kept within a safe range. Therefore, the low-release flame-retardant cable has excellent performance in the aspects of flame retardance, heat dissipation performance, electrical performance, environmental protection characteristic and the like.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, specifically to a low-release flame-retardant cable. Background Technology

[0002] With the rapid development of modern power and communication technologies, cables, as an important carrier of electrical energy transmission and information transmission, face increasingly stringent requirements for performance and safety. Especially in situations with extremely high safety requirements, such as high-rise buildings, subways, tunnels, and data centers, cables not only need excellent conductivity but also outstanding flame retardancy, low smoke, and halogen-free properties to ensure that in emergencies such as fires, they can effectively reduce the release of smoke and toxic gases, protecting personnel safety and minimizing property damage.

[0003] With the development of the cable industry, various new types of flame-retardant cables have emerged, among which low-emission flame-retardant cables have attracted much attention due to their excellent flame-retardant performance and environmentally friendly characteristics. These cables, through the use of specially structured flame-retardant layers, shielding layers, and sheath designs, can significantly reduce smoke release and toxic gas content during combustion while ensuring electrical performance and mechanical strength. However, some existing low-emission flame-retardant cables still have some shortcomings. For example, the flame-retardant layer winding method of some cables is relatively simple, resulting in an unsatisfactory flame-retardant effect; in addition, some cables do not adequately consider heat dissipation performance in their sheath design, making the cables prone to overheating under long-term high-load operation, affecting service life and safety.

[0004] Therefore, it is necessary to provide a low-release flame-retardant cable that has good flame retardant and heat dissipation properties while maintaining excellent electrical properties and mechanical strength. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a low-release flame-retardant cable, which solves the problem of poor performance in some existing low-release flame-retardant cables.

[0006] A low-emission flame-retardant cable includes a cable core comprising multiple stranded copper conductors and an inner insulation layer, an inner shielding layer, and an inner flame-retardant layer disposed outside the copper conductors. A flame-retardant filler layer is disposed between the five cable cores. A sheath is circumferentially disposed outside the five cable cores. The sheath comprises an outer shielding layer, an outer flame-retardant layer, a heat dissipation layer, and a low-smoke halogen-free outer sheath. The outer flame-retardant layer is a flame-retardant winding film, and the flame-retardant winding film is configured in two layers. The two flame-retardant winding films are wound around the outer side of the outer shielding layer using a spiral winding and circumferential winding method.

[0007] Preferably, the flame-retardant wrapping film includes a wrapping film base film, and a first flame-retardant protective layer is provided on each of the two opposite planes of the wrapping film base film. A second flame-retardant protective layer is provided on the side of the first flame-retardant protective layer away from the wrapping film base film. A wear-resistant layer is provided on the side of the second flame-retardant protective layer away from the first flame-retardant protective layer. A cavity is provided in the second flame-retardant protective layer, and the cavity is filled with flame-retardant material.

[0008] Furthermore, the flame retardant material is magnesium hydroxide flame retardant material.

[0009] Furthermore, the first flame-retardant protective layer is a flame-retardant PE film layer, and the second flame-retardant protective layer is a halogen-free flame-retardant layer.

[0010] Preferably, the inner insulation layer is an irradiated cross-linked polyethylene insulation layer.

[0011] Preferably, the inner shielding layer is an aluminum foil shielding layer, and the outer shielding layer is a copper wire braided shielding layer.

[0012] Preferably, the heat dissipation layer is a thermally conductive rubber heat dissipation layer.

[0013] Preferably, the flame-retardant filler layer is high flame-retardant polyethylene or high flame-retardant ethylene / vinyl acetate copolymer.

[0014] Preferably, a tensile steel wire is provided at the center of the sheath.

[0015] Preferably, the low-smoke halogen-free outer sheath is a ceramic-armored low-smoke halogen-free polyolefin outer sheath.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This utility model provides a low-release flame-retardant cable, comprising a cable core and a sheath annularly disposed on the outside of the cable core. First, a flame-retardant filler layer is disposed between the cable cores, enhancing the overall flame-retardant effect of the cable. Second, the outer flame-retardant layer of the cable uses two layers of flame-retardant winding film, tightly bonded to the outside of the outer shielding layer through spiral winding and circumferential winding. This not only increases the thickness and density of the outer flame-retardant layer but also effectively improves the overall flame-retardant performance of the cable through multi-layer winding and interlaced structure. Even under extreme conditions, the cable maintains excellent flame-retardant performance, reducing the risk of fire. Third, the heat dissipation layer, with its high thermal conductivity, helps to quickly transfer heat generated inside the cable to the outside, keeping the cable's operating temperature within a safe range. Simultaneously, the use of a low-smoke halogen-free outer sheath ensures that the smoke and toxic gas content produced during combustion is extremely low, meeting the high environmental and safety requirements of modern buildings and equipment. The remaining protective layers ensure that the cable possesses excellent electrical performance. Therefore, this low-release flame-retardant cable exhibits excellent performance in terms of flame retardancy, heat dissipation, electrical performance, and environmental characteristics. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the low-release flame-retardant cable described in this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the flame-retardant wrapping film described in this utility model;

[0020] Figure 3 This is a schematic diagram of the winding of the flame-retardant wrapping film described in this utility model.

[0021] in:

[0022] 10-Cable core, 20-Sheath, 40-Tension steel wire, 11-Copper conductor, 12-Inner insulation layer, 13-Inner shielding layer, 14-Inner flame retardant layer, 15-Flame retardant filler layer, 22-Outer shielding layer, 23-Outer flame retardant layer, 24-Heat dissipation layer, 25-Low smoke halogen-free outer sheath, 31-Stretch film base film, 32-First flame retardant protective layer, 33-Second flame retardant protective layer, 34-Abrasion-resistant layer, 35-Cavity. Detailed Implementation

[0023] The embodiments described below are merely some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0024] See Figures 1-3This embodiment provides a low-release flame-retardant cable, comprising a cable core 10, wherein the cable core 10 comprises multiple stranded copper conductors 11 and an inner insulation layer 12, an inner shielding layer 13 and an inner flame-retardant layer 14 disposed outside the copper conductors 11. A flame-retardant filling layer 15 is disposed between the five cable cores 10. A sheath 20 is circumferentially disposed outside the five cable cores 10. The sheath 20 comprises an outer shielding layer 22, an outer flame-retardant layer 23, a heat dissipation layer 24 and a low-smoke halogen-free outer sheath 25. The outer flame-retardant layer 23 is a flame-retardant winding film, and the flame-retardant winding film is configured as two layers. The two flame-retardant winding films are wound on the outside of the outer shielding layer 22 by a spiral winding plus circumferential winding method.

[0025] See Figure 3 Specifically, in this application, one layer of flame-retardant wrapping film is spirally wound, and the other layer is circumferentially wound. The spiral winding method allows the flame-retardant wrapping film to form a continuous, tight spiral structure along the cable's axial direction. This not only increases the thickness of the flame-retardant layer but also creates additional barriers to heat and flame propagation through the continuous spiral path, effectively slowing the spread of the flame. Simultaneously, the tight structure formed by the spiral winding enhances the cable's mechanical strength, improving its resistance to damage under external forces. The circumferential winding of the other layer of flame-retardant wrapping film effectively complements the spiral winding. By adding circumferential winding layers between the spiral coils, it forms an interlaced and mutually supporting structure, further increasing the density of the flame-retardant layer. This also allows the flame-retardant layer to form a more robust protective barrier when subjected to flame impact, effectively preventing direct erosion of the cable's internal structure by flames and high temperatures. Furthermore, circumferential winding helps improve the cable's uniformity and stability, enabling it to maintain excellent flame-retardant performance in various complex environments. Therefore, the combination of helical and circumferential winding not only significantly increases the thickness and density of the outer flame-retardant layer 23 of the cable, but also provides more comprehensive and effective flame-retardant protection for the cable through multi-layer winding and interlaced structure. Even under extreme conditions, such as high temperature and open flame, the cable can maintain excellent flame-retardant performance, effectively reducing the risk of fire and ensuring the safe and stable operation of the power system.

[0026] See Figure 2Preferably, the flame-retardant wrapping film includes a wrapping film base film 31. A first flame-retardant protective layer 32 is disposed on each of the two opposite planes of the wrapping film base film 31. A second flame-retardant protective layer 33 is disposed on the side of the first flame-retardant protective layer 32 away from the wrapping film base film 31. A wear-resistant layer 34 is disposed on the side of the second flame-retardant protective layer 33 away from the first flame-retardant protective layer 32. A cavity 35 is disposed within the second flame-retardant protective layer 33, and the cavity 35 is filled with a flame-retardant material. In this application, the combination of the first flame-retardant protective layer 32 and the second flame-retardant protective layer 33 enables the flame-retardant wrapping film to possess excellent flame-retardant properties. The flame-retardant material used is magnesium hydroxide, an environmentally friendly and highly efficient flame retardant that can absorb heat, release moisture, and generate a substance with heat-insulating effects during combustion, thereby effectively slowing down the spread of flames. Furthermore, a wear-resistant layer 34 is disposed on the outer side of the second flame-retardant protective layer 33 to enhance the durability and wear resistance of the flame-retardant wrapping film.

[0027] Furthermore, the flame-retardant wrapping film described in this application includes a first flame-retardant protective layer 32, which is a flame-retardant PE film layer, and a second flame-retardant protective layer 33, which is a halogen-free flame-retardant layer. The excellent flexibility and processing performance of the flame-retardant PE film layer ensure the ease of operation and adhesion of the wrapping film, while maintaining a high flame-retardant rating. The halogen-free flame-retardant layer not only possesses excellent flame-retardant properties but also ensures that the smoke and toxic gas content released by the cable during combustion is extremely low, meeting modern environmental protection requirements.

[0028] Preferably, the inner insulation layer 12 is an irradiated cross-linked polyethylene insulation layer. The inner insulation layer 12 is treated with irradiation cross-linking technology, resulting in more cross-linking points between the polyethylene molecular chains. This significantly improves the heat resistance, mechanical strength, and electrical performance of the insulation layer, ensuring the stability and safety of the cable during long-term operation. In this embodiment, an outer insulation layer is provided within the outer shielding layer 22. This outer insulation layer is a physically foamed polyethylene insulation layer. The outer insulation layer, through physical foaming technology, forms a large number of microbubbles in the polyethylene. These bubbles not only reduce the density of the insulation layer and lighten the weight of the cable, but also improve the cable's flexibility and bending performance while maintaining good electrical insulation performance. Therefore, the combined design of the inner insulation layer 12 and the outer insulation layer not only improves the overall performance of the cable but also meets the needs of different application scenarios, providing a strong guarantee for the safe and stable operation of the cable.

[0029] Preferably, the inner shielding layer 13 is an aluminum foil shielding layer, and the outer shielding layer 22 is a copper wire braided shielding layer. The aluminum foil shielding layer has excellent conductivity and electromagnetic shielding effect, effectively preventing leakage of electromagnetic fields inside the cable and reducing the impact of electromagnetic interference on cable performance. Simultaneously, the aluminum foil shielding layer also possesses good flexibility and mechanical strength, adapting to the bending and stretching requirements of the cable during laying and use, maintaining a stable shielding effect. The copper wire braided shielding layer has excellent electromagnetic shielding effect, effectively resisting interference from external electromagnetic fields and protecting the transmission quality of signals and data inside the cable. At the same time, the copper wire braided structure gives the shielding layer higher mechanical strength and wear resistance, enabling it to maintain stable shielding performance in complex environments.

[0030] Preferably, the heat dissipation layer 24 is a thermally conductive rubber heat dissipation layer 24. Thermally conductive rubber is a material with high thermal conductivity and excellent flexibility, which can quickly conduct heat generated inside the cable to the outside, effectively reducing the operating temperature of the cable and improving the current carrying capacity and stability of the cable. At the same time, thermally conductive rubber also has good insulation properties and aging resistance, and can maintain a stable heat dissipation effect in harsh environments such as long-term high temperature and humidity.

[0031] Preferably, the flame-retardant filler layer 15 is made of highly flame-retardant polyethylene or a highly flame-retardant ethylene / vinyl acetate copolymer. These materials not only possess excellent flame-retardant properties, effectively suppressing flame spread and reducing the release of smoke and toxic gases during combustion, but also exhibit good mechanical and processing properties, meeting various requirements of the cable during manufacturing and use. Therefore, by employing these highly flame-retardant materials as the flame-retardant filler layer 15, the low-release flame-retardant cable of this invention achieves significant improvements in flame-retardant performance, safety, and reliability, providing a more robust guarantee for the safe and stable operation of power and communication systems.

[0032] Preferably, a tensile steel wire 40 is provided at the center of the sheath 20. The provision of the tensile steel wire 40 significantly enhances the tensile strength and tensile capacity of the cable, enabling the cable to better maintain structural integrity and stability when subjected to external stretching or bending forces.

[0033] Preferably, the low-smoke halogen-free outer sheath 25 is a ceramic-armored low-smoke halogen-free polyolefin outer sheath. The ceramic-armored low-smoke halogen-free polyolefin outer sheath not only possesses environmentally friendly characteristics of low smoke, halogen-free, and low toxicity, significantly reducing the release of smoke and toxic gases during combustion, meeting the high environmental and safety requirements of modern buildings and equipment; moreover, through ceramic armoring, a hard ceramic layer is formed on the surface of the outer sheath. This layer has extremely high fire resistance and impact resistance, effectively protecting the internal structure of the cable from damage under extreme conditions such as fires. This gives the cable excellent fire-retardant properties.

[0034] Preferably, the number of cable cores 10 in this embodiment is 5, but of course 1 to 4 are also possible, which will not be elaborated here.

[0035] This utility model provides a low-release flame-retardant cable, comprising a cable core 10 and a sheath 20 annularly disposed outside the cable core 10. First, a flame-retardant filling layer 15 is provided between the cable cores 10, enhancing the overall flame-retardant effect of the cable. Second, the outer flame-retardant layer 23 of the cable uses two layers of flame-retardant winding film, which are tightly bonded to the outside of the outer shielding layer 22 through spiral winding and circumferential winding. This not only increases the thickness and density of the outer flame-retardant layer 23, but also effectively improves the overall flame-retardant performance of the cable through multi-layer winding and interlaced structure. Even under extreme conditions, the cable can maintain excellent flame-retardant performance, reducing the risk of fire. Third, the heat dissipation layer 24, with its high thermal conductivity, helps to quickly transfer the heat generated inside the cable to the outside, keeping the cable's operating temperature within a safe range. Simultaneously, the use of a low-smoke halogen-free outer sheath 25 ensures that the smoke and toxic gas content generated during cable combustion is extremely low, meeting the high environmental and safety requirements of modern buildings and equipment. The remaining protective layers ensure that the cable possesses excellent electrical performance. Therefore, this low-release flame-retardant cable exhibits excellent performance in terms of flame retardancy, heat dissipation, electrical properties, and environmental characteristics.

[0036] The above-disclosed embodiments are merely some preferred embodiments of the present utility model, and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent changes made in accordance with the scope of the present utility model patent application shall still fall within the scope of the present utility model.

Claims

1. A low-release flame-retardant cable, comprising a cable core, the cable core comprising a plurality of stranded copper conductors and an inner insulation layer, an inner shielding layer, and an inner flame-retardant layer disposed outside the copper conductors, characterized in that, A flame-retardant filling layer is provided between the cable cores, and a sheath is provided in an annular shape on the outside of the cable cores. The sheath includes an outer shielding layer, an outer flame-retardant layer, a heat dissipation layer, and a low-smoke halogen-free outer sheath. The outer flame-retardant layer is a flame-retardant winding film, and the flame-retardant winding film is provided in two layers. The two flame-retardant winding films are wound on the outside of the outer shielding layer by a spiral winding plus circumferential winding method.

2. The low-release flame-retardant cable as described in claim 1, characterized in that, The flame-retardant wrapping film includes a wrapping film base film. A first flame-retardant protective layer is provided on each of the two opposite planes of the wrapping film base film. A second flame-retardant protective layer is provided on the side of the first flame-retardant protective layer away from the wrapping film base film. A wear-resistant layer is provided on the side of the second flame-retardant protective layer away from the first flame-retardant protective layer. A cavity is provided in the second flame-retardant protective layer, and the cavity is filled with flame-retardant material.

3. The low-release flame-retardant cable as described in claim 2, characterized in that, The flame retardant material is magnesium hydroxide flame retardant material.

4. The low-release flame-retardant cable as described in claim 2, characterized in that, The first flame-retardant protective layer is a flame-retardant PE film layer, and the second flame-retardant protective layer is a halogen-free flame-retardant layer.

5. The low-release flame-retardant cable as described in claim 1, characterized in that, The inner insulation layer is an irradiated cross-linked polyethylene insulation layer.

6. The low-release flame-retardant cable as described in claim 1, characterized in that, The inner shielding layer is an aluminum foil shielding layer, and the outer shielding layer is a copper wire braided shielding layer.

7. The low-release flame-retardant cable as described in claim 1, characterized in that, The heat dissipation layer is a thermally conductive rubber heat dissipation layer.

8. The low-release flame-retardant cable as described in claim 1, characterized in that, The flame-retardant filler layer is made of highly flame-retardant polyethylene or highly flame-retardant ethylene / vinyl acetate copolymer.

9. The low-release flame-retardant cable as described in claim 1, characterized in that, A tensile steel wire is provided at the center of the sheath.

10. The low-release flame-retardant cable as described in claim 1, characterized in that, The low-smoke halogen-free outer sheath is a ceramic-armored low-smoke halogen-free polyolefin outer sheath.

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