A polyethylene cable

Abstract

The utility model discloses a kind of polyethylene cables, it is related to cable technical field, including cable core, the cable core is made of four annular distribution wire core stranding, the wire core is made of conductor and the insulating layer being set in the conductor outside, the interstice of the cable core is filled with epoxy resin glue, overlapping wrapping iron fluorine long composite fireproof belt outside cable core, iron fluorine long composite fireproof belt is extruded and covered with thermoplastic silicone rubber inner protective layer, the outside braiding of thermoplastic silicone rubber inner protective layer is by tinned copper braid, the outside wrapping of tinned copper braid is glass fibre rubber coated cloth, the outside of glass fibre rubber coated cloth is covered with high temperature resistant aluminium plastic composite belt, the outside overlapping wrapping of high temperature resistant aluminium plastic composite belt is high silica fibre fireproof belt, the extruded and covered with thermoplastic halogen-free low smoke flame-retardant polyolefin outer sheath of high silica fibre fireproof belt, the scheme solves the problem that polyolefin sheath power cable exists in high temperature resistance and flame retardant performance aspect deficiency, cannot work stably under high temperature environment.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, specifically to a polyethylene cable. Background Technology

[0002] Power cables, as key products for transmitting and distributing electrical energy, are widely used in commercial, industrial, and residential areas, responsible for efficiently and stably distributing electricity to various electrical devices. The cable sheath plays a crucial role in ensuring the normal operation of the cable, protecting its internal structure, and extending its service life. Common cable sheath materials include polyvinyl chloride (PVC), polyethylene (PE), and polyurethane. Polyethylene, in particular, is favored due to its excellent chemical stability, strong resistance to corrosive substances such as acids and alkalis, and excellent low-temperature performance, maintaining good performance even in low-temperature environments.

[0003] For example, the Chinese authorized patent CN115322468B, "A Low-Smoke Halogen-Free Flame-Retardant Power Cable", has an outer sheath with excellent mechanical and flame-retardant properties through a specific combination of components. It can effectively protect the cable core from mechanical damage and prevent the spread of fire in the event of a fire.

[0004] However, polyethylene materials have poor high-temperature resistance. During the use of power cables, heat is generated due to the current and external environmental factors. When exposed to high temperatures for a long time, the sheath is prone to softening, deformation, or even melting, causing the conductor inside the cable to be exposed. This can easily cause short circuits and fires, seriously threatening safety. Therefore, it does not meet the current requirements. To address this, we have proposed a polyethylene cable. Utility Model Content

[0005] The purpose of this invention is to provide a polyethylene cable to solve the problem mentioned in the background art that existing polyolefin sheathed power cables are insufficient in terms of high temperature resistance and flame retardancy, and cannot work stably in high temperature environments.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a polyethylene cable, comprising a cable core, wherein the cable core is formed by twisting together four ring-shaped wire cores, each wire core consisting of a conductor and an insulation layer disposed outside the conductor, the gaps in the cable core being filled with epoxy resin, and a Teflon composite fireproof tape being overlapped and wrapped around the cable core, the Teflon composite fireproof tape being extruded with a thermoplastic silicone rubber inner sheath, the outer braid of the thermoplastic silicone rubber inner sheath being made of tin-plated copper braided tape, the outer wrapping of the tin-plated copper braided tape being made of glass fiber coated cloth, the outer covering of the glass fiber coated cloth being covered with a high-temperature resistant aluminum-plastic composite tape, the outer overlapping wrapping of the high-temperature resistant aluminum-plastic composite tape being made of high-silica fiber fireproof tape, and the outer extrusion of the high-silica fiber fireproof tape being made of thermoplastic halogen-free low-smoke flame-retardant polyolefin outer sheath.

[0007] Preferably, the conductor is made of graphene-coated soft copper wire stranded together.

[0008] Preferably, the insulating layer is composed of a first base layer, a base layer and a second base layer that are sequentially laminated together. The base layer is located between the first base layer and the second base layer. The base layer is basalt fiber fabric. The front and back sides of the base layer are coated with insulating and thermally conductive adhesive layers. The first base layer is a PET insulating film and the second base layer is a high-silica fiber insulating tape.

[0009] Preferably, the Teflon composite fireproof strip includes a Teflon mesh strip substrate, the upper surface of which is laminated with carbon fiber woven fabric using insulating and thermally conductive adhesive, and the lower surface of which is laminated with glass fiber fireproof and flame-retardant fabric using insulating and thermally conductive adhesive.

[0010] Preferably, the high-silica fiber fireproof belt is overlapped and wrapped around the high-temperature resistant aluminum-plastic composite belt, and the high-silica fiber fireproof belt is made of high-silica fiber yarn rich in silica through carding and weaving.

[0011] Preferably, the thermoplastic halogen-free low-smoke flame-retardant polyolefin outer sheath is extruded onto the outer surface of the high-silica fiber fireproof belt.

[0012] Preferably, the thermoplastic silicone rubber inner sheath is extruded onto the outer surface of the Teflon composite fireproof belt, the tin-plated copper braided strip is woven onto the outer surface of the thermoplastic silicone rubber inner sheath, the glass fiber coated cloth is wrapped around the outer surface of the tin-plated copper braided strip, and the high-temperature resistant aluminum-plastic composite belt is covered onto the outer surface of the glass fiber coated cloth.

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

[0014] 1. The carbon fiber woven fabric, glass fiber fire-retardant fabric, and Teflon mesh tape matrix of this utility model, when combined, exhibit excellent fire resistance. The glass fiber coated fabric does not burn upon contact with flames and possesses fire-retardant and alkali-resistant properties. The overlapping wrapping of the high-silica fiber fireproof tape allows it to operate at high temperatures for extended periods without becoming brittle or producing harmful gases. The outermost thermoplastic halogen-free, low-smoke, flame-retardant polyolefin outer sheath further enhances the cable's flame-retardant properties, effectively preventing the spread of flames in the event of a fire, buying valuable time for evacuation and firefighting efforts, and protecting personal and property safety.

[0015] 2. This utility model uses graphene-coated soft copper wire as the conductor, which reduces the conductor cross-section when transmitting the same conductive load. Therefore, the overall cross-section of the wire does not increase significantly despite the addition of insulation layers. The insulation layer adopts a composite structure: a first-layer PET insulating film, a base layer of basalt fiber fabric and insulating thermally conductive adhesive, and a second-layer high-silica fiber insulating tape. These layers work synergistically to improve the high-temperature resistance of the insulation layer. Simultaneously, the thermoplastic silicone rubber inner sheath has excellent high-temperature resistance. Combined with the protection of the high-temperature resistant aluminum-plastic composite tape and the high-silica fiber fireproof tape, the cable can operate stably in high-temperature environments, effectively reducing problems such as sheath softening and deformation caused by high temperatures.

[0016] 3. The thermoplastic halogen-free, low-smoke, flame-retardant polyolefin outer sheath of this invention does not release toxic halogen gases during combustion and produces extremely low smoke, reducing environmental pollution and harm to the respiratory tract. The high-silica fiber fireproof belt does not produce dust or harmful gases during high-temperature operation, meeting environmental protection requirements and is suitable for locations with high environmental performance requirements. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present utility model;

[0018] Figure 2 This is a cross-sectional view of the internal structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the insulating layer structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the Teflon composite fireproof belt of this utility model.

[0021] In the diagram: 1. Cable core; 2. Wire core; 21. Conductor; 22. Insulation layer; 221. First base layer; 222. Base layer; 223. Second base layer; 3. Teflon composite fireproof tape; 31. Teflon mesh tape substrate; 32. Carbon fiber woven fabric; 33. Fiberglass fireproof and flame-retardant fabric; 4. Thermoplastic silicone rubber inner sheath; 5. Tin-plated copper braided tape; 6. Fiberglass coated fabric; 7. High-temperature resistant aluminum-plastic composite tape; 8. High-silica fiber fireproof tape; 9. Thermoplastic halogen-free low-smoke flame-retardant polyolefin outer sheath; 10. Epoxy resin adhesive. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Please see Figure 1-4An embodiment of this utility model provides: a polyethylene cable, including a cable core 1, which is formed by twisting four ring-shaped wire cores 2 together. Each wire core 2 consists of a conductor 21 and an insulation layer 22 disposed outside the conductor 21. The gaps in the cable core 1 are filled with epoxy resin 10. A Teflon composite fireproof tape 3 is wrapped around the outside of the cable core 1. A thermoplastic silicone rubber inner sheath 4 is extruded over the Teflon composite fireproof tape 3. The outer braid of the thermoplastic silicone rubber inner sheath 4 is made of tin-plated copper braided tape 5. A glass fiber coated cloth 6 is wrapped around the outside of the tin-plated copper braided tape 5. A high-temperature resistant aluminum-plastic composite tape 7 is wrapped around the outside of the glass fiber coated cloth 6. A high-silica fiber fireproof tape 8 is wrapped around the outside of the high-silica fiber fireproof tape 7. A thermoplastic halogen-free low-smoke flame-retardant polyolefin outer sheath 9 is extruded over the outside of the high-silica fiber fireproof tape 8.

[0024] Cable core 1 is formed by stranding wire cores 2 to create the core structure for power transmission. Epoxy resin 10 fills the gaps and, after curing, tightly wraps around wire cores 2, enhancing the structural stability of cable core 1. Multiple layers, including Teflon composite fireproof tape 3 and a thermoplastic silicone rubber inner sheath 4, provide layer-by-layer protection. Benefits: The stranded wire cores 2 facilitate current transmission; epoxy resin 10 enhances the resistance of cable core 1 to external forces, preventing loosening and displacement of wire cores 2; the multi-layered protective structure protects cable core 1 from fire resistance, high-temperature resistance, and insulation, extending the cable's service life and ensuring safe and stable power transmission.

[0025] Furthermore, conductor 21 is made of graphene-coated soft copper wire stranded together. The graphene coating improves the conductivity of the copper wire, and the stranding method gives conductor 21 flexibility. When current flows through, the coating reduces resistance, and the stranded structure adapts to bending environments. This reduces power transmission loss, improves transmission efficiency, and facilitates cable installation and laying in complex environments, reducing the risk of conductor 21 breakage due to bending.

[0026] Please see Figure 3 The insulating layer 22 is composed of a first base layer 221, a base layer 222, and a second base layer 223 sequentially laminated together. The base layer 222 is located between the first base layer 221 and the second base layer 223. The base layer 222 is basalt fiber fabric. The front and back sides of the base layer 222 are coated with insulating and thermally conductive adhesive layers. The first base layer 221 is a PET insulating film, and the second base layer 223 is a high-silica fiber insulating tape.

[0027] The composite of PET insulating film, basalt fiber fabric, insulating and thermally conductive adhesive layer, and high-silica fiber insulating tape forms a multi-layered insulating barrier, isolating conductor 21 from the outside environment. The thermally conductive adhesive layer also assists in heat dissipation. This multi-layered composite significantly improves insulation performance and prevents leakage. The PET insulating film and high-silica fiber insulating tape provide excellent high-temperature resistance and flame retardant properties, ensuring the safe operation of the cable in various environments.

[0028] Please see Figure 4The Teflon composite fireproof strip 3 includes a Teflon mesh strip substrate 31, the upper surface of which is composited with carbon fiber woven fabric 32 through insulating and thermally conductive adhesive, and the lower surface of which is composited with glass fiber fireproof and flame-retardant fabric 33 through insulating and thermally conductive adhesive.

[0029] In the event of a fire, the carbon fiber woven fabric 32, the glass fiber fire-retardant fabric 33, and the Teflon mesh tape substrate 31 work together to resist high temperatures and prevent the spread of flames, while the insulating and thermally conductive adhesive ensures a tight bond between the layers. This effectively improves the fire resistance of the cable, buying time for firefighting and personnel evacuation, and reducing the damage to the cable and the surrounding environment caused by the fire.

[0030] Please see Figure 1 and Figure 2 High-silica fiber fireproof tape 8 is overlapped and wrapped around high-temperature resistant aluminum-plastic composite tape 7. The high-silica fiber fireproof tape 8 is made of high-silica fiber yarn rich in silica, which is carded and woven. The high-silica fiber yarn is resistant to high temperatures, and the overlapping wrapping forms a tight protective layer, blocking the transmission of high temperatures. The high-temperature resistant aluminum-plastic composite tape 7 provides auxiliary heat insulation and protection. This enhances the cable's tolerance to high-temperature environments, protects the internal structure from high-temperature damage, and ensures the cable's continuous and stable operation under high-temperature conditions.

[0031] Please see Figure 1 and Figure 2 The thermoplastic halogen-free low-smoke flame-retardant polyolefin outer sheath 9 is extruded onto the outer surface of the high-silica fiber fireproof strip 8. The outer sheath 9 is in direct contact with the external environment. During normal use, it resists physical wear and chemical corrosion. When exposed to fire, its flame-retardant components play a role in preventing the flame from burning and spreading.

[0032] Please see Figure 1 and Figure 2 A thermoplastic silicone rubber inner sheath 4 is extruded onto the outer surface of the Teflon composite fireproof strip 3. A tin-plated copper braided strip 5 is woven onto the outer surface of the thermoplastic silicone rubber inner sheath 4. A fiberglass coated cloth 6 is wrapped around the outer surface of the tin-plated copper braided strip 5. A high-temperature resistant aluminum-plastic composite strip 7 is wrapped around the outer surface of the fiberglass coated cloth 6. The thermoplastic silicone rubber inner sheath 4 provides elastic cushioning and initial protection; the tin-plated copper braided strip 5 shields electromagnetic interference and enhances mechanical strength; the fiberglass coated cloth 6 is high-temperature resistant and fireproof; and the high-temperature resistant aluminum-plastic composite strip 7 provides further heat insulation and protection. These layers work together to form a comprehensive protection system.

[0033] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A polyethylene cable, comprising a cable core (1), characterized in that: The cable core (1) is formed by twisting together four ring-shaped wire cores (2). The wire core (2) consists of a conductor (21) and an insulation layer (22) disposed outside the conductor (21). The gaps in the cable core (1) are filled with epoxy resin glue (10). Teflon composite fireproof tape (3) is wrapped around the outside of the cable core (1). A thermoplastic silicone rubber inner sheath (4) is extruded around the Teflon composite fireproof tape (3). The outer braid of the thermoplastic silicone rubber inner sheath (4) is made of tin-plated copper braided tape (5). A glass fiber coated cloth (6) is wrapped around the outside of the tin-plated copper braided tape (5). A high-temperature resistant aluminum-plastic composite tape (7) is wrapped around the outside of the high-temperature resistant aluminum-plastic composite tape (7). A high-silica fiber fireproof tape (8) is wrapped around the outside of the high-silica fiber fireproof tape (8). A thermoplastic halogen-free low-smoke flame-retardant polyolefin outer sheath (9) is extruded around the outside of the high-silica fiber fireproof tape (8).

2. A polyethylene cable according to claim 1, characterized in that: The conductor (21) is made of graphene-coated soft copper wire stranded together.

3. A polyethylene cable according to claim 1, characterized in that: The insulating layer (22) is composed of a first base layer (221), a base layer (222), and a second base layer (223) sequentially laminated together. The base layer (222) is located between the first base layer (221) and the second base layer (223). The base layer (222) is basalt fiber fabric. The base layer (222) is coated with insulating and thermally conductive adhesive layers on both sides. The first base layer (221) is a PET insulating film, and the second base layer (223) is a high-silica fiber insulating tape.

4. A polyethylene cable according to claim 1, characterized in that: The Teflon composite fireproof strip (3) includes a Teflon mesh strip substrate (31), the upper surface of which is composited with carbon fiber woven fabric (32) through insulating and thermally conductive adhesive, and the lower surface of which is composited with glass fiber fireproof and flame-retardant fabric (33) through insulating and thermally conductive adhesive.

5. A polyethylene cable according to claim 1, characterized in that: The high-silica fiber fireproof belt (8) is wrapped around the high-temperature resistant aluminum-plastic composite belt (7). The high-silica fiber fireproof belt (8) is made of high-silica fiber yarn rich in silica through combing and weaving.

6. A polyethylene cable according to claim 1, characterized in that: The thermoplastic halogen-free low-smoke flame-retardant polyolefin outer sheath (9) is extruded onto the outer surface of the high-silica fiber fireproof strip (8).

7. A polyethylene cable according to claim 1, characterized in that: The thermoplastic silicone rubber inner sheath (4) is extruded onto the outer surface of the Teflon composite fireproof belt (3), the tin-plated copper braided belt (5) is woven onto the outer surface of the thermoplastic silicone rubber inner sheath (4), the glass fiber coated cloth (6) is wrapped around the outer surface of the tin-plated copper braided belt (5), and the high-temperature resistant aluminum-plastic composite belt (7) is covered onto the outer surface of the glass fiber coated cloth (6).

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