Environment-friendly insulation fire-retardant fire-resistant medium voltage cable

Abstract

The utility model discloses an environmental protection type insulating fire -retardant fire -resistant medium -voltage cable, including environmental protection cable main part, environmental protection cable main part's surface fixedly arranged has wear -resisting protection structure, wear -resisting protection structure's inboard fixedly arranged has fire -retardant protection layer, fire -retardant protection layer's inboard fixedly arranged has fire -resistant protection layer, fire -resistant protection layer's inboard fixedly arranged has heat -proof protection layer, heat -proof protection layer's inboard fixedly arranged has reinforcing rib, reinforcing rib's inboard fixedly arranged has filler layer, filler layer's inboard fixedly arranged has buffer layer, buffer layer's inboard fixedly arranged has insulating shield layer, insulating shield layer's inboard fixedly arranged has insulating layer, insulating layer's inboard fixedly arranged has wire core shield layer, wire core shield layer's inboard fixedly arranged has wire core, the utility model discloses an environmental protection type insulating fire -retardant fire -resistant medium -voltage cable, and this cable promotes wear resistance, mechanical performance on the basis of original function through multilayer cooperation.

Description

Technical Field

[0001] This utility model relates to the field of power cable technology, specifically to an environmentally friendly, insulated, flame-retardant, and fire-resistant medium-voltage cable. Background Technology

[0002] The development of environmentally friendly, insulated, flame-retardant, and fire-resistant medium-voltage cables is closely related to the significant shortcomings in the mechanical properties of traditional medium-voltage cables. The cross-linked polyethylene and ethylene propylene rubber insulation materials used in traditional cables generally suffer from poor abrasion resistance and insufficient tensile and impact resistance. During installation, they are prone to surface damage due to friction and compression, and long-term use often leads to insulation layer cracking due to external mechanical stress. This not only affects the stability of power transmission but may also cause safety hazards such as short circuits. Furthermore, these materials are not environmentally friendly, generating irritating gases during production that are difficult to recycle. Their flame-retardant and fire-resistant properties also fail to meet the requirements of complex scenarios such as high-rise buildings and tunnels. However, with the increasing demands for durability, safety, and environmental friendliness in power transmission cables, coupled with the application of materials such as polypropylene that combine good mechanical properties and environmental characteristics, and the promotion of relevant industry standards, the development of medium-voltage cables that combine insulation, flame retardancy, fire resistance, environmental friendliness, and excellent mechanical properties has been spurred.

[0003] Existing technologies also include insulated flame-retardant cables, such as a fire-resistant, heat-insulating, and flame-retardant power cable (application number 202322933344.5). This cable body comprises a fire-resistant protective layer, a heat-insulating protective layer, a flame-retardant protective layer, a filler layer, and a cable core. The fire-resistant protective layer wraps around the outer surface of the heat-insulating protective layer, and the heat-insulating protective layer wraps around the outer surface of the flame-retardant protective layer. The filler layer is located on the inner surface of the flame-retardant protective layer. The fire-resistant protective layer includes fiberglass tubing, asbestos tubing, and slag wool tubing; the heat-insulating protective layer includes polyurethane insulation, polyethylene insulation, and polyester fiber insulation; and the flame-retardant protective layer includes a flame-retardant rubber sheath and a flame-retardant fiber sheath. However, these common types of insulated flame-retardant cables still have the following shortcomings in practical applications: This insulated flame-retardant cable focuses on insulation and fire prevention. While it provides some fire protection and insulation, it still has some shortcomings in surface protection. During installation and use, the cable surface is damaged by external stress and friction. Over time, this leads to increased corrosion, poor wear resistance, and a decline in electrical performance.

[0004] The use of flame-retardant and fire-resistant materials may lead to uneven dispersion, causing stress concentration within the material and reducing the toughness and impact resistance of the insulation layer, resulting in insufficient mechanical properties of the cable. Utility Model Content

[0005] The purpose of this utility model is to provide an environmentally friendly, insulated, flame-retardant, and fire-resistant medium-voltage cable to solve the problems of insufficient wear resistance and inadequate mechanical properties mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an environmentally friendly, insulated, flame-retardant, and fire-resistant medium-voltage cable, comprising an environmentally friendly cable body, the environmentally friendly cable body including a wear-resistant protective structure, a flame-retardant protective layer fixedly disposed on the inner side of the wear-resistant protective structure, a fire-resistant protective layer fixedly disposed on the inner side of the flame-retardant protective layer, a heat-insulating protective layer fixedly disposed on the inner side of the fire-resistant protective layer, a reinforcing rib fixedly disposed on the inner side of the heat-insulating protective layer, a filler layer fixedly disposed on the inner side of the reinforcing rib, a buffer layer fixedly disposed on the inner side of the filler layer, an insulating shielding layer fixedly disposed on the inner side of the buffer layer, an insulating layer fixedly disposed on the inner side of the insulating shielding layer, a core shielding layer fixedly disposed on the inner side of the insulating layer, and a core fixedly disposed on the inner side of the core shielding layer.

[0007] Preferably, the wear-resistant protective structure includes a weather-resistant and corrosion-resistant coating, a base wear-resistant layer fixedly disposed on the inner side of the weather-resistant and corrosion-resistant coating, a reinforcing skeleton layer fixedly disposed on the inner side of the base wear-resistant layer and embedded in the base wear-resistant layer, and a lubrication buffer layer fixedly disposed on the inner side of the reinforcing skeleton layer; wherein the weather-resistant and corrosion-resistant coating is made of environmentally friendly polyurethane material, the base wear-resistant layer is made of low-smoke halogen-free flame-retardant polyolefin as the core material, the lubrication buffer layer is a nitrile rubber composite coating, and the reinforcing skeleton layer is made of fiberglass cloth. The weather-resistant and corrosion-resistant coating can resist external environmental erosion, the base wear-resistant layer ensures good wear resistance and is environmentally friendly and flame-retardant, the lubrication buffer layer reduces internal friction and impact, and the reinforcing skeleton layer improves the overall structural strength. The four layers work together to comprehensively improve the cable's weather resistance, wear resistance, environmental protection, and structural stability.

[0008] Preferably, the flame-retardant protective layer is made of magnesium hydroxide-modified halogen-free flame-retardant polyolefin material, the fire-resistant protective layer is made of alkali-free glass fiber material, and the heat-insulating protective layer is made of recycled glass fiber material; the flame-retardant ability is long-lasting, the fire resistance and high temperature resistance are good, the heat insulation is good, and it is also environmentally friendly and meets the mechanical strength requirements.

[0009] Preferably, the reinforcing rib is made of glass fiber material, and the filling layer is made of environmentally friendly low-smoke halogen-free flame-retardant filling rope material; it has strong bending and tensile resistance, compact internal structure, and high stability and safety.

[0010] Preferably, the insulating layer is made of montmorillonite, and the insulating shielding layer is made of carbon black; it has excellent insulation performance, anti-aging properties, good shielding effect, and a robust structure, ensuring electrical stability.

[0011] Preferably, the conductor is made of aluminum-magnesium alloy and is located in the central area of ​​the environmentally friendly cable body; it has good conductivity, high strength, strong wear resistance, uniform stress, and stable and efficient power transmission.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: Firstly, the weather-resistant and anti-corrosion coating, by adding a coating layer to the outside of the basic wear-resistant layer, provides protection against external climate and chemical corrosion for the entire wear-resistant protection structure and even the cable. The basic wear-resistant layer wrapped by the weather-resistant and anti-corrosion coating provides support and adhesion for other layers, maintaining the stability of the entire wear-resistant protection structure. The lubrication buffer layer located inside the basic wear-resistant coating is used to alleviate the interaction between the basic wear-resistant layer and the inner structure of the cable, reducing frictional damage and mechanical stress transmission between the two. The reinforcing skeleton layer embedded in the basic wear-resistant layer enhances the structural strength of the basic wear-resistant layer, improves the wear-resistant protection effect and deformation resistance. The entire wear-resistant protection structure comprehensively improves the reliability of the cable and enhances its wear resistance.

[0013] A small amount of glass fiber is incorporated into the structure of this cable. The glass fiber enhances the mechanical properties of each functional layer, indirectly improving the overall mechanical properties of the cable. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the environmentally friendly, insulated, flame-retardant, and fire-resistant medium-voltage cable of this utility model; Figure 2 This is a cross-sectional view of the environmentally friendly, insulated, flame-retardant, and fire-resistant medium-voltage cable of this utility model; Figure 3 This is a front view of the environmentally friendly, insulated, flame-retardant, and fire-resistant medium-voltage cable of this utility model; Figure 4 This is a schematic diagram of the wear-resistant protective structure of this utility model.

[0015] In the diagram: 1. Main body of environmentally friendly cable; 2. Lubricating buffer layer; 3. Fire-resistant protective layer; 4. Flame-retardant protective layer; 5. Heat-insulating protective layer; 6. Core wire; 7. Core wire shielding layer; 8. Insulation layer; 9. Insulation shielding layer; 10. Filler layer; 11. Reinforcing rib; 12. Buffer layer; 13. Weather-resistant and corrosion-resistant coating; 14. Basic wear-resistant layer; 15. Reinforcing skeleton layer; 16. Wear-resistant protective structure. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0017] Please see Figure 1-4This utility model provides an environmentally friendly, insulated, flame-retardant, and fire-resistant medium-voltage cable, including an environmentally friendly cable body 1. The environmentally friendly cable body includes a wear-resistant protective structure 16. A flame-retardant protective layer 4 is fixedly disposed on the inner side of the wear-resistant protective structure 16. A fire-resistant protective layer 3 is fixedly disposed on the inner side of the flame-retardant protective layer 4. A heat-insulating protective layer 5 is fixedly disposed on the inner side of the fire-resistant protective layer 3. A reinforcing rib 11 is fixedly disposed on the inner side of the heat-insulating protective layer 5. A filler layer 10 is fixedly disposed on the inner side of the reinforcing rib 11. A buffer layer 12 is fixedly disposed on the inner side of the filler layer 10. An insulating shielding layer 9 is fixedly disposed on the inner side of the buffer layer 12. An insulating layer 8 is fixedly disposed on the inner side of the insulating shielding layer 9. A wire core shielding layer 7 is fixedly disposed on the inner side of the insulating layer 8. A wire core 6 is fixedly disposed on the inner side of the wire core shielding layer 7.

[0018] Please see Figure 3 and Figure 4 The wear-resistant protective structure 6 includes a weather-resistant and anti-corrosion coating 13. A basic wear-resistant layer 14 is fixedly disposed on the inner side of the weather-resistant and anti-corrosion coating 13. A reinforcing skeleton layer 15 is fixedly disposed on the inner side of the basic wear-resistant layer 14 and embedded in the basic wear-resistant layer 14. A lubrication buffer layer 2 is fixedly disposed on the inner side of the reinforcing skeleton layer 15.

[0019] During use, the weather-resistant and corrosion-resistant coating 13 effectively resists external wind, rain, ultraviolet rays and other erosion, preventing the cable surface from rusting. The low-smoke halogen-free flame-retardant polyolefin material of the base wear-resistant layer 14 has good wear resistance and produces little smoke and releases no halogens when exposed to fire. The nitrile rubber composite coating of the lubricating buffer layer 2 can reduce the friction between the base wear-resistant layer 14 and the inner structure, and plays a buffering role when the cable is bent or vibrated. The glass fiber cloth of the reinforcing skeleton layer 15 is embedded in the base wear-resistant layer 14, which greatly improves the tensile and tear resistance of the overall structure, making the cable more resistant to wear during laying and use.

[0020] Please see Figure 1 , Figure 2 as well as Figure 3 The flame-retardant protective layer 4 is made of magnesium hydroxide-modified halogen-free flame-retardant polyolefin material, the fire-resistant protective layer 3 is made of alkali-free glass fiber material, and the heat-insulating protective layer 5 is made of glass fiber material.

[0021] When in use, the magnesium hydroxide-modified halogen-free flame-retardant polyolefin in the flame-retardant protective layer 4 decomposes and absorbs heat, inhibiting the spread of flames and producing no harmful gases. The alkali-free glass fiber in the fire-resistant protective layer 3 can maintain structural stability at high temperatures, preventing flames from directly scorching the interior. The recycled glass fiber in the heat-insulating protective layer 5 effectively reduces heat transfer to the interior.

[0022] Please see Figure 1 , Figure 2 as well as Figure 3The reinforcing rib 11 is made of glass fiber material, and the filler layer 10 is made of environmentally friendly low-smoke halogen-free flame-retardant filler rope material.

[0023] During use, the high strength of the glass fiber in the reinforcing rib 11 enhances the cable's resistance to bending and tension, preventing excessive deformation of the cable when dragged or bent. The environmentally friendly, low-smoke, halogen-free, flame-retardant filling rope in the filler layer 10 is tightly filled between and around the reinforcing rib 11, making the internal structure more compact and preventing the reinforcing rib 11 from shifting. The combination of the two makes the overall structure of the cable more stable.

[0024] Please see Figure 1 , Figure 2 as well as Figure 3 The insulating layer 8 is made of montmorillonite, and the insulating shielding layer 9 is made of carbon black.

[0025] In use, the montmorillonite in the insulation layer 8 enhances its insulation performance, effectively blocking current leakage and adapting to the insulation requirements of medium-voltage environments. The carbon black in the insulation shielding layer 9 balances the electric field and reduces electric field interference. A small amount of glass fiber enhances the strength of the shielding layer, making it less prone to damage, ensuring stable shielding effect, and ensuring the safety and stability of power transmission.

[0026] Please see Figure 1 , Figure 2 as well as Figure 3 The conductor 6 is made of aluminum-magnesium alloy and is located in the central area of ​​the environmentally friendly cable body 1.

[0027] When in use, the aluminum-magnesium alloy core 6 has good conductivity and is copper-plated, while also possessing high strength and wear resistance. It can efficiently transmit power and is not easily affected by wear. The core 6 is located in the central area, which makes the cable subjected to uniform force in all directions, reducing local wear or performance instability caused by positional deviation, and ensuring continuous and efficient power transmission.

[0028] In this embodiment, the outermost wear-resistant protective structure 16 plays a crucial protective role. The weather-resistant and corrosion-resistant coating 13 resists external wind, rain, ultraviolet radiation, and other erosion. The basic wear-resistant layer 14, with its excellent wear resistance, copes with various frictions and collisions. The lubricating buffer layer 2 reduces friction and impact between internal structures. The reinforcing skeleton layer 15 enhances the overall tensile and tear resistance, providing comprehensive protection against various possible damages from the outside. In emergencies such as fires, the flame-retardant protective layer 4 inhibits flame spread by decomposing and absorbing heat. The fire-resistant protective layer 3 maintains structural stability at high temperatures, preventing flame burning. The heat-insulating protective layer 5 reduces heat transfer to the interior, forming multiple layers of protection and providing more safe operating time for the cable. The reinforcing ribs 11 and the filler layer 10 work together. The reinforcing ribs 11 enhance the cable's bending and tensile strength with the high strength of glass fiber. The tightly filled filler layer 10 makes the internal structure more compact, effectively ensuring the cable's structural stability. The insulation layer 9 enhances insulation performance with added montmorillonite, preventing current leakage. The insulating shielding layer 8 balances the electric field and reduces interference with carbon black, and a small amount of glass fiber enhances its strength, ensuring the safety and stability of power transmission. The core 6, located in the central area, is made of aluminum-magnesium alloy to achieve high conductivity, while also possessing high strength and wear resistance. Its central position ensures that the cable is subjected to uniform force in all directions, guaranteeing continuous and efficient power transmission. The use of these materials and the cooperation between the layers also increase wear resistance and mechanical properties.

[0029] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An environmentally friendly, insulated, flame-retardant, fire-resistant medium-voltage cable, comprising an environmentally friendly cable body (1), characterized in that: The environmentally friendly cable body (1) includes a wear-resistant protective structure (16), a flame-retardant protective layer (4) is fixedly provided on the inner side of the wear-resistant protective structure (16), a fire-resistant protective layer (3) is fixedly provided on the inner side of the flame-retardant protective layer (4), a heat-insulating protective layer (5) is fixedly provided on the inner side of the fire-resistant protective layer (3), a reinforcing rib (11) is fixedly provided on the inner side of the heat-insulating protective layer (5), a filler layer (10) is fixedly provided on the inner side of the reinforcing rib (11), a buffer layer (12) is fixedly provided on the inner side of the filler layer (10), an insulating shielding layer (9) is fixedly provided on the inner side of the buffer layer (12), an insulating layer (8) is fixedly provided on the inner side of the insulating shielding layer (9), a wire core shielding layer (7) is fixedly provided on the inner side of the insulating layer (8), and a wire core (6) is fixedly provided on the inner side of the wire core shielding layer (7).

2. The environmentally friendly insulated, flame-retardant, and fire-resistant medium-voltage cable according to claim 1, characterized in that: The wear-resistant protective structure (16) includes a weather-resistant and corrosion-resistant coating (13), a base wear-resistant layer (14) is fixedly provided on the inner side of the weather-resistant and corrosion-resistant coating (13), a reinforcing skeleton layer (15) is fixedly provided on the inner side of the base wear-resistant layer (14), and the reinforcing skeleton layer (15) is embedded in the base wear-resistant layer (14). A lubrication buffer layer (2) is fixedly provided on the inner side of the reinforcing skeleton layer (15).

3. The environmentally friendly insulated, flame-retardant, and fire-resistant medium-voltage cable according to claim 1, characterized in that: The flame-retardant protective layer (4) is made of magnesium hydroxide-modified halogen-free flame-retardant polyolefin material, the fire-resistant protective layer (3) is made of alkali-free glass fiber material, and the heat-insulating protective layer (5) is made of recycled glass fiber material.

4. The environmentally friendly insulated, flame-retardant, and fire-resistant medium-voltage cable according to claim 1, characterized in that: The reinforcing rib (11) is made of glass fiber material, and the filler layer (10) is made of environmentally friendly low-smoke halogen-free flame-retardant filler rope material.

5. The environmentally friendly insulated, flame-retardant, and fire-resistant medium-voltage cable according to claim 1, characterized in that: The insulating layer (8) is made of montmorillonite, and the insulating shielding layer (9) is made of carbon black.

6. The environmentally friendly insulated, flame-retardant, and fire-resistant medium-voltage cable according to claim 1, characterized in that: The core (6) is made of aluminum-magnesium alloy and is located in the central area of ​​the environmentally friendly cable body (1).

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