Cross-linked polyethylene insulated non-magnetic metal armored flame-retardant power cable

Abstract

The utility model discloses a cross-linked polyethylene insulated non-magnetic metal armored flame-retardant power cable comprising a cable core which is formed by twisting a plurality of cross-linked polyethylene insulated wire cores. Graphene fibers are filled in gaps of the cable core; an anti-aging rubber hose is arranged outside the cable core, and a plurality of V-shaped anti-extrusion heat dissipation grooves are formed in the outer surface of the anti-aging rubber hose; a crocheting mixed shielding layer is arranged outside the anti-aging rubber hose, a high-temperature fire-resistant synthetic crystal insulating tape is lapped outside the crocheting mixed shielding layer, a high-strength braided flame-retardant layer is lapped outside the high-temperature fire-resistant synthetic crystal insulating tape in an overlapping manner, a non-magnetic metal armor layer is arranged outside the high-strength braided flame-retardant layer, and a magnetic shielding layer is arranged outside the non-magnetic metal armor layer. And a ceramic silicone rubber oxygen insulation outer sheath is extruded outside the non-magnetic metal armor layer. The cable has excellent mechanical property, shielding property and flame retardance, and is economical and environment-friendly.

Description

Technical Field

[0001] This utility model relates to the field of wires and cables, specifically to cross-linked polyethylene insulated non-magnetic metal armored flame-retardant power cables. Background Technology

[0002] Currently, with the rapid development of my country's power industry, the consumption of wires and cables has also increased significantly, especially for power cables used in ultra-high voltage and extra-high voltage transmission lines. As the backbone network for power transmission is the main force, it must rely on large-section power cables. Therefore, the safe use of large-section power cables is of paramount importance. In addition, fire is one of the major disasters that always threaten people's lives and property. Building fires are generally caused by aging electrical wiring, in which wires and cables play a crucial role. Therefore, fire prevention has become a top priority. In particular, the losses from fire to important properties, cultural relics, and documents are incalculable. Thus, the fire resistance requirements for power supply lines to these special "customers" are particularly important. Most existing cables have the defect of low fire resistance.

[0003] During long-term use, aging is likely to occur, and the corrosion resistance is poor, which leads to damage to the insulation layer, thereby affecting power transmission. In addition, ordinary power cables do not have fire resistance, which can lead to safety accidents, causing serious casualties and social losses.

[0004] After prolonged use with electrical current, the surface temperature of cables made of conventional materials will continuously rise, especially under heavy loads. This can even lead to internal sparks, impacting the surrounding environment and posing a significant risk of fire. The combustion of these sparks produces toxic gases, causing substantial loss of life and property. Furthermore, ordinary power cables are susceptible to corrosion and erosion, resulting in poor insulation protection and easy damage, thus shortening their lifespan. Additionally, ordinary power cables lack effective waterproofing measures, allowing water to seep into the cable from the terminals, causing short circuits and creating even greater safety hazards. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, a cross-linked polyethylene insulated non-magnetic metal armored flame-retardant power cable is provided.

[0006] To achieve the above objectives, this utility model provides a cross-linked polyethylene insulated non-magnetic metal armored flame-retardant power cable, comprising a cable core, wherein the cable core is formed by stranding multiple cross-linked polyethylene insulated wire cores; the gaps in the cable core are filled with graphene fiber rope; an anti-aging rubber hose is provided outside the cable core, and multiple V-shaped anti-compression heat dissipation grooves are provided on the outer surface of the anti-aging rubber hose; a hook-braided hybrid shielding layer is provided outside the anti-aging rubber hose; a high-temperature fire-resistant synthetic crystal insulation tape is wrapped around the hook-braided hybrid shielding layer; a high-strength braided flame-retardant layer is overlapped and wrapped around the high-temperature fire-resistant synthetic crystal insulation tape; a non-magnetic metal armoring layer is provided outside the high-strength braided flame-retardant layer; and a ceramicized silicone rubber oxygen-barrier outer sheath is extruded outside the non-magnetic metal armoring layer.

[0007] Preferably, the cross-linked polyethylene insulated core includes a graphene aluminum alloy conductor, a cross-linked polyethylene insulation layer is extruded over the graphene aluminum alloy conductor, a reinforced shielding layer is provided outside the cross-linked polyethylene insulation layer, and a ceramicized silicone rubber oxygen-barrier inner sheath is extruded over the reinforced shielding layer.

[0008] Preferably, the reinforcing shielding layer includes a copper sheet, which is folded into a double-layer structure at a position off-center from the centerline, consisting of an outer copper sheet and an inner copper sheet. The length of the outer copper sheet is greater than the length of the inner copper sheet. The outer copper sheet covers the outside of the entire reinforcing shielding layer, and the inner copper sheet is pressed against the inside of the entire reinforcing shielding layer.

[0009] Preferably, the copper sheet has multiple pressure grooves on both the inner and outer surfaces of its fold.

[0010] Preferably, the anti-aging rubber hose includes a hose body, the inner side of which is provided with an inner anti-aging coating, the outer side of which is provided with an outer anti-aging coating, and the outer side of the outer anti-aging coating is provided with a pressure-resistant layer.

[0011] Preferably, the compression-resistant layer includes a highly elastic polyurethane sheath and multiple carbon fiber braided reinforcing cores disposed within the highly elastic polyurethane sheath.

[0012] Preferably, the crocheted hybrid shielding layer is a mesh shielding layer crocheted using oxygen-free copper wire with a diameter of not less than 0.2 mm as the warp and carbon fiber wire with a diameter of not less than 0.2 mm as the weft.

[0013] Preferably, the high-strength woven flame-retardant layer comprises a flame-retardant woven fabric layer, an aluminum base strip, and a high-temperature resistant grease film. The flame-retardant woven fabric layer is bonded to the front side of the aluminum base strip by an adhesive, and the high-temperature resistant grease film is bonded to the back side of the aluminum base strip by an adhesive.

[0014] Preferably, the adhesive is a high-elasticity flame-retardant resin.

[0015] Preferably, the non-magnetic metal armor layer is a stainless steel strip or an aluminum alloy strip.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. The graphene-aluminum alloy conductor possesses very high strength, reaching 130 GPa (a unit of pressure, 1 GPa = 1000 MPa), with a Young's modulus of approximately 1100 GPa and a breaking strength of approximately 125 GPa. Graphene has a resistivity of only about 10 nΩm (a unit of resistivity) and conductivity approximately 100 times that of copper. By uniformly embedding graphene into the aluminum matrix, the mechanical and electrical properties of the aluminum conductor can be better matched, thereby meeting the conductor material requirements of various sectors of the national economy, such as medium and high voltage power transmission and transformation, high-speed trains, and wind power generation.

[0018] 2. The graphene fiber rope is filled with extremely high strength and good flexibility, enabling the cable core to meet the requirements of high strength.

[0019] 3. The reinforced shielding layer with a double-fold structure can improve the shielding performance of this cable. Moreover, the outer copper sheath 5 and the inner copper sheath have good wrapping performance and high tear resistance under the same external force conditions, which reduces the probability of cracks and helps to extend the actual service life of this cable.

[0020] 4. The carbon fiber braided reinforcing core in the compression layer has an extremely high strength-to-weight ratio, making the braided reinforcing core both lightweight and strong. It has excellent mechanical properties and stability, is not easily corroded by chemicals, and is suitable for harsh environments. In addition, combined with the high-elasticity polyurethane sheath, it greatly enhances the cable's tensile strength, tear strength, and abrasion resistance. Moreover, the high-elasticity polyurethane sheath maintains good elasticity and elongation even in the high hardness range, making the entire compression layer strong internally and elastic externally.

[0021] 5. It features a crocheted hybrid shielding layer, which uses crocheting technology to interweave oxygen-free copper wire and carbon fiber wire into a mesh structure. This structure not only provides excellent shielding effect but also has a certain degree of flexibility and durability. The mesh structure design helps to improve the ventilation and heat dissipation of the shielding layer, which is especially important for cables that operate stably for a long time. The high conductivity of oxygen-free copper wire ensures good shielding performance, while the addition of carbon fiber wire may further enhance the strength and stability of the shielding layer.

[0022] 6. The use of non-magnetic metal strips enhances the cable's fire resistance and resistance to external impacts, preventing interference from the cable itself with other cables and from external magnetic fields.

[0023] 7. The cable adopts a ceramicized silicone rubber oxygen-barrier outer sheath, which can form a dense and hard ceramic body under high temperature environment. This ceramic body can not only prevent the spread of flames, but also protect the normal operation of internal components under high temperature conditions, and maintain the integrity of the circuit at a high temperature of 950℃. The ceramic body also has good fireproof and heat insulation properties, which can effectively prevent heat transfer in a fire and protect the cable core from high temperature damage. In addition, the ceramicized silicone rubber sintered body has high hardness and strength, and has certain flexural strength and compression strength. The main residue during combustion is silicon dioxide, which will not cause harm to the human body and the environment. It produces less smoke, which helps to improve the visibility of the fire scene and facilitates fire fighting. It can be recycled and reused, making it economical and environmentally friendly. This allows the cable to meet the requirements of BS6387 CWZ level (950℃ fire resistance, spray and vibration test), GB12666.6 Class A, GB31247 Class A and other fire-resistant cable standards. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 A schematic diagram of the structure for strengthening the shielding layer;

[0026] Figure 3 This is a schematic diagram of the structure of an anti-aging rubber hose;

[0027] Figure 4 This is a schematic diagram of the structure of the crocheted hybrid shielding layer;

[0028] Figure 5 A schematic diagram of the structure of a high-strength woven flame-retardant layer. Detailed Implementation

[0029] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0030] like Figure 1 As shown, this utility model provides a cross-linked polyethylene insulated non-magnetic metal armored flame-retardant power cable, including a cable core, which is formed by stranding multiple cross-linked polyethylene insulated wire cores.

[0031] The cross-linked polyethylene insulated core includes a graphene-aluminum alloy conductor 1, which has very high strength, reaching 130 GPa (a unit of pressure, 1 GPa = 1000 MPa), a Young's modulus of approximately 1100 GPa, and a breaking strength of approximately 125 GPa. Graphene has a resistivity of only about 10 nΩm (a unit of resistivity) and conductivity approximately 100 times that of copper. By uniformly embedding graphene into the aluminum matrix, the mechanical and electrical properties of the aluminum conductor can be better matched, thereby meeting the needs of conductor materials in different sectors of the national economy, such as medium and high voltage power transmission and transformation, high-speed trains, and wind power generation. In addition, combining graphene with aluminum alloy can effectively improve the strength of the aluminum alloy.

[0032] A cross-linked polyethylene insulation layer 2 is extruded over the graphene aluminum alloy conductor 1. A reinforcing shielding layer 3 is provided outside the cross-linked polyethylene insulation layer 2. A ceramicized silicone rubber oxygen-barrier inner sheath 4 is extruded over the reinforcing shielding layer 3. The ceramicized silicone rubber can form a dense and hard ceramic body under high temperature conditions. This ceramic body can not only prevent the spread of flames, but also protect the normal operation of internal components under high temperature conditions. It can maintain the integrity of the circuit at a high temperature of 950℃. The ceramic body also has good fireproof and heat insulation properties, which can effectively prevent heat transfer in a fire and protect the cable core from high temperature damage.

[0033] In this embodiment, graphene fiber rope 5 is filled into the gaps in the cable core, possessing extremely high strength and good flexibility, enabling the cable core to meet the requirements of high strength. An anti-aging rubber hose 6 is provided outside the cable core, with multiple V-shaped anti-compression heat dissipation grooves 7 on its outer surface. A braided hybrid shielding layer 8 is provided outside the anti-aging rubber hose, and a high-temperature refractory synthetic crystal insulating tape 9 is wrapped around the braided hybrid shielding layer 8. This crystal insulating tape is a synthetic mica tape, available in single-sided and double-sided versions, with alkali-free glass cloth used as a reinforcing layer. Simultaneously, a moisture-proof polyester film is bonded to the alkali-free glass cloth, and the polyester film is coated with a flame retardant. This structure not only ensures moisture-proof properties compared to traditional mica tape but also further improves the flame-retardant properties of the entire synthetic mica tape. A high-strength braided flame-retardant layer 10 is overlapped and wrapped around the high-temperature refractory synthetic crystal insulating tape 9, with an overlap rate of not less than 85%. A non-magnetic metal armor layer 11 is provided outside the high-strength braided flame-retardant layer. The cable has a ceramicized silicone rubber oxygen-barrier outer sheath 12 extruded over a non-magnetic metal armor layer. Similarly, the ceramicized silicone rubber can form a dense and hard ceramic body under high temperature conditions. This ceramic body can not only prevent the spread of flames, but also protect the normal operation of internal components under high temperature conditions, and maintain the integrity of the circuit at a high temperature of 950℃. The ceramic body also has good fireproof and heat insulation properties, which can effectively prevent heat transfer in a fire and protect the cable core from high temperature damage. In addition, the sintered body of ceramicized silicone rubber has high hardness and strength, and has certain flexural strength and compression strength. The main residue during combustion is silicon dioxide, which will not cause harm to the human body and the environment. It produces less smoke, which helps to improve the visibility of the fire scene and facilitates fire fighting. It can be recycled and reused, which is economical and environmentally friendly. This allows the cable to meet the requirements of BS6387 CWZ level (950℃ fire resistance, spray and vibration test), GB12666.6 Class A, GB31247 Class A and other fire-resistant cable standards.

[0034] In this embodiment, further optimizations are made, such as... Figure 2 As shown, the reinforcing shielding layer 3 includes a copper foil. The copper foil is folded into a double-layer structure at a position off-center from the centerline, consisting of an outer copper foil 31 and an inner copper foil 32. The length of the outer copper foil is greater than the length of the inner copper foil. The outer copper foil covers the outside of the entire reinforcing shielding layer, while the inner copper foil is pressed against the inside of the entire reinforcing shielding layer. By adopting a double-layer folded structure, the shielding performance of this cable can be improved. Moreover, the outer copper foil 31 and the inner copper foil have good wrapping performance and high tear resistance under the same external force conditions, reducing the probability of cracks and helping to extend the actual service life of this cable.

[0035] In this embodiment, the copper sheet has multiple pressure grooves 33 on both the inner and outer surfaces of its fold. By designing the pressure grooves, the mutual compression ability between the outer and inner copper sheets under the wrapping pressure is increased, thereby improving the tightness and integrity of the reinforced shielding layer and thus better playing the shielding role.

[0036] In this embodiment, as Figure 3 As shown, the anti-aging rubber hose 6 includes a hose body 61. The inner side of the hose body 61 is provided with an inner anti-aging coating 62, and the outer side is provided with an outer anti-aging coating 63. Furthermore, an anti-compression layer 64 is provided on the outer side of the outer anti-aging coating to increase the internal compressive strength of the cable, protect the cable core from being crushed and deformed, and protect the wire core.

[0037] The compression-resistant layer includes a high-elasticity polyurethane sheath 641 and multiple carbon fiber braided reinforcing cores 642 disposed within the high-elasticity polyurethane sheath. The carbon fiber braided reinforcing cores have an extremely high strength-to-weight ratio, making them both lightweight and strong, with excellent mechanical properties and stability. They are not easily corroded by chemical substances and are suitable for harsh environments. Furthermore, combined with the high-elasticity polyurethane sheath, the tensile strength, tear strength, and abrasion resistance of the cable are greatly enhanced. The high-elasticity polyurethane sheath also maintains good elasticity and elongation in the high hardness range, making the entire compression-resistant layer internally robust and externally elastic.

[0038] In this embodiment, as Figure 3 As shown, the high-elasticity polyurethane sheath has multiple V-shaped anti-compression heat dissipation grooves, which facilitates heat dissipation of the cable and improves the cable's anti-compression performance.

[0039] In this embodiment, as Figure 4 As shown, the crocheted hybrid shielding layer 8 is a mesh shielding layer crocheted using oxygen-free copper wire 81 with a diameter of not less than 0.2 mm as the warp and carbon fiber wire 82 with a diameter of not less than 0.2 mm as the weft. The oxygen-free copper wire and carbon fiber wire are interwoven into a mesh structure through crocheting technology. This structure not only provides a good shielding effect, but also has a certain degree of flexibility and durability. The mesh structure design helps to improve the ventilation and heat dissipation of the shielding layer, which is especially important for cables that operate stably for a long time. The high conductivity of oxygen-free copper wire ensures good shielding performance, while the addition of carbon fiber wire may further enhance the strength and stability of the shielding layer.

[0040] In this embodiment, as Figure 5 As shown, the high-strength woven flame-retardant layer 10 includes a flame-retardant woven fabric layer 101, an aluminum base strip 102, and a high-temperature resistant grease film 103. The flame-retardant woven fabric layer is bonded to the front side of the aluminum base strip by an adhesive, and the high-temperature resistant grease film is bonded to the back side of the aluminum base strip by an adhesive. The flame-retardant woven fabric not only has good flame-retardant properties, but also high mechanical strength and strong stability in use. It is also halogen-free, safe and environmentally friendly.

[0041] In addition, the adhesive is a high-elasticity flame-retardant resin, which gives the high-strength woven flame-retardant layer excellent flame-retardant properties and good corrosion resistance.

[0042] The entire high-strength braided flame-retardant layer combines the flame-retardant properties of the flame-retardant braided fabric, the structural strength of the aluminum base tape, and the heat-resistant protection of the high-temperature grease film, greatly improving the performance of the cable.

[0043] In this embodiment, the non-magnetic metal strip is a stainless steel strip or an aluminum alloy strip, which enhances the cable's fire resistance and resistance to external impacts. This prevents the cable itself from interfering with other cables and also prevents external magnetic fields from interfering with it.

[0044] In summary, through the above improvements, this cable possesses excellent mechanical properties, shielding, flame retardancy, and is economical and environmentally friendly, enabling it to meet the requirements of BS638 CWZ level (950℃ fire resistance, spray and vibration test), GB12666.6 Class A, GB31247 Class A, and a series of other fire-resistant cable standards.

[0045] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the principle of the present utility model, and these should also be considered to fall within the protection scope of the present utility model.

Claims

1. A cross-linked polyethylene insulated non-magnetic metal-armored flame-retardant power cable, comprising a cable core, characterized in that: The cable core is made of multiple cross-linked polyethylene insulated wire cores twisted together; the gaps in the cable core are filled with graphene fiber rope (5); an anti-aging rubber hose (6) is provided outside the cable core, and multiple V-shaped anti-extrusion heat dissipation grooves (7) are provided on the outer surface of the anti-aging rubber hose; a hook-braided hybrid shielding layer (8) is provided outside the anti-aging rubber hose, a high-temperature fire-resistant synthetic crystal insulating tape (9) is wrapped around the hook-braided hybrid shielding layer, a high-strength braided flame-retardant layer (10) is overlapped and wrapped around the high-temperature fire-resistant synthetic crystal insulating tape, a non-magnetic metal armor layer (11) is provided outside the high-strength braided flame-retardant layer, and a ceramicized silicone rubber oxygen-barrier outer sheath (12) is extruded outside the non-magnetic metal armor layer.

2. The cross-linked polyethylene insulated non-magnetic metal-armored flame-retardant power cable according to claim 1, characterized in that: The cross-linked polyethylene insulated wire core includes a graphene aluminum alloy conductor (1), a cross-linked polyethylene insulation layer (2) extruded on the graphene aluminum alloy conductor, a reinforced shielding layer (3) provided on the outside of the cross-linked polyethylene insulation layer, and a ceramicized silicone rubber oxygen-barrier inner sheath (4) extruded on the outside of the reinforced shielding layer.

3. The cross-linked polyethylene insulated non-magnetic metal-armored flame-retardant power cable according to claim 2, characterized in that: The reinforced shielding layer (3) includes a copper sheet, which is folded into a double-layer structure at a position off the center line and consists of an outer copper sheet (31) and an inner copper sheet (32). The length of the outer copper sheet is greater than the length of the inner copper sheet. The outer copper sheet covers the outside of the entire reinforced shielding layer, and the inner copper sheet is pressed on the inside of the entire reinforced shielding layer.

4. The cross-linked polyethylene insulated non-magnetic metal-armored flame-retardant power cable according to claim 3, characterized in that: The copper sheet has multiple pressure grooves (33) on both the inner and outer surfaces of its fold.

5. The cross-linked polyethylene insulated non-magnetic metal-armored flame-retardant power cable according to claim 1, characterized in that: The anti-aging rubber hose (6) includes a hose body (61), an inner anti-aging coating (62) is provided on the inner side of the hose body, an outer anti-aging coating (63) is provided on the outer side, and an anti-pressure layer (64) is provided on the outer side of the outer anti-aging coating.

6. The cross-linked polyethylene insulated non-magnetic metal-armored flame-retardant power cable according to claim 5, characterized in that: The compression-resistant layer (64) includes a high-elasticity polyurethane sheath (641) and multiple carbon fiber braided reinforcing cores (642) disposed within the high-elasticity polyurethane sheath.

7. The cross-linked polyethylene insulated non-magnetic metal-armored flame-retardant power cable according to claim 1, characterized in that: The crocheted hybrid shielding layer (8) is a mesh shielding layer crocheted with oxygen-free copper wire (81) with a diameter of not less than 0.2 mm as the warp and carbon fiber wire (82) with a diameter of not less than 0.2 mm as the weft.

8. The cross-linked polyethylene insulated non-magnetic metal-armored flame-retardant power cable according to claim 1, characterized in that: The high-strength woven flame-retardant layer (10) includes a flame-retardant woven fabric layer (101), an aluminum base strip (102), and a high-temperature resistant grease film (103). The flame-retardant woven fabric layer is bonded to the front side of the aluminum base strip by an adhesive, and the high-temperature resistant grease film is bonded to the back side of the aluminum base strip by an adhesive.

9. The cross-linked polyethylene insulated non-magnetic metal-armored flame-retardant power cable according to claim 8, characterized in that: The adhesive is a high-elasticity flame-retardant resin.

10. The cross-linked polyethylene insulated non-magnetic metal-armored flame-retardant power cable according to claim 1, characterized in that: The non-magnetic metal armor layer (11) is a stainless steel strip or an aluminum alloy strip.

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