Novel 35kV waterproof, rat-proof, ant-proof and ultraviolet-proof B1-level cable for rail transit

Abstract

The invention discloses a novel 35kV rail transit waterproof, rat-proof, ant-proof and ultraviolet-proof B1-level cable, which belongs to the technical field of wires and cables and comprises a conductor, the conductor is formed by twisting a plurality of copper cores, the conductor is filled with water-blocking paste, an insulating layer is arranged on the outer side of the conductor, a shielding layer is arranged on the outer side of the insulating layer, and the shielding layer is arranged on the outer side of the insulating layer. A shielding layer is arranged on the outer side of the cable, a glass fiber belt is arranged on the outer side of the shielding layer, an oxygen isolation layer is arranged on the outer side of the glass fiber belt, a sheath layer is arranged on the outer side of the oxygen isolation layer and comprises a corrugated copper sheath and an outer sheath, and the sheath layer is arranged on the outermost layer of the cable. According to the invention, in the sheath layer, the sheath layer is arranged at the outermost layer of the cable through the corrugated copper sheath and the outer sheath, so that the radial water-blocking performance of the cable can be improved, and external moisture is prevented from permeating into the cable. The sheath layer arranged on the outer layer of the cable can prevent water from entering the cable, and when the sheath layer is damaged, the internal conductor can be prevented from short circuit through the water-blocking paste.

Description

Technical Field

[0001] The invention relates to a novel 35kV waterproof, rat-proof, ant-proof and ultraviolet-proof B1-level cable for rail transit, belonging to the technical field of electric wires and cables. Background Art

[0002] In modern urban rail transit, power cables are a key component to ensure the safety and stability of train operation, and 35kV cables are widely used in some high-voltage transmission lines. Limited by the rail transit environment, cables need to have a certain ability to resist the influence of the external environment, such as waterproof, rat and ant proof, UV protection, etc. When the cable is in an exposed environment such as high temperature, humidity, underground or outdoors, the insulation performance and durability of the cable will greatly affect the stability and operation safety of the system. Therefore, it is necessary to design a cable that can resist the above environmental problems.

[0003] The cables currently used in high-voltage transmission lines in rail transit have some defects: the waterproof performance is not ideal, and water vapor is prone to infiltration in a humid environment for a long time, resulting in a decrease in the insulation performance of the cable, and in severe cases, a short circuit is prone to occur; the anti-rat and ant ability is insufficient, and the cable material cannot completely prevent rats and ants from gnawing, and the cable is prone to damage; the performance of withstanding ultraviolet rays is insufficient, and cables exposed outdoors are affected by ultraviolet rays, causing the material to age and crack, shortening the service life; the flame retardant performance is not ideal, and some cables used in rail transit cannot meet the B1 standard. When the cable burns, the flame is easy to transmit and the flame intensity is high. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a new type of 35kV waterproof, rat-ant-proof and UV-proof B1 grade cable for rail transit, which solves the problems that high-voltage cables used for rail transit are waterproof, rat-ant-proof and UV-proof, and the cables are prone to violent combustion when burning.

[0005] The technical problem to be solved by the present invention is achieved by adopting the following technical scheme: A new type of 35kV rail transit waterproof, rat-proof, ant-proof and ultraviolet-proof B1-level cable, comprising

[0006] The conductor is formed by twisting a plurality of copper cores.

[0007] The conductor is filled with water-blocking paste, an insulating layer is arranged on the outside of the conductor, a shielding layer is arranged on the outside of the insulating layer, a glass fiber tape is arranged on the outside of the shielding layer, an oxygen isolation layer is arranged on the outside of the glass fiber tape, and a sheath layer is arranged on the outside of the oxygen isolation layer.

[0008] Preferably, the insulating layer is polypropylene, and the polypropylene is fixed on the outside of the conductor in an extruded manner.

[0009] Preferably, electric shielding material is also provided on both sides of the insulating layer.

[0010] Preferably, the shielding layer comprises a copper wire shielding layer and a copper tape.

[0011] Preferably, the copper wire shielding layer is annealed soft copper wire, which is fixed on the outside of the insulating layer in a sparsely wound manner.

[0012] Preferably, the copper tape is fixed on the outside of the copper wire shielding layer in a winding manner, and the winding direction of the copper tape is opposite to that of the copper wire shielding layer.

[0013] Preferably, the oxygen barrier layer is polyolefin, and the polyolefin is fixed on the outside of the shielding layer in an extrusion manner.

[0014] Preferably, the sheath layer comprises a corrugated copper sheath and an outer sheath.

[0015] Preferably, the corrugated copper sheath is welded into a tubular shape by copper tubes and pressed into a corrugated shape by a mold.

[0016] Preferably, the outer sheath is made of B1 grade polyolefin and is fixed to the outside of the corrugated copper sheath by extrusion.

[0017] The beneficial effects of the present invention are:

[0018] (1) Through the present invention, the internal conductor is formed by twisting multiple copper cores, and a water-blocking paste is twisted inside the conductor. The water-blocking paste can fill the gaps in the conductor to prevent moisture from penetrating along the longitudinal direction of the conductor. In the sheath layer, the sheath layer is arranged on the outermost layer of the cable through the corrugated copper sheath and the outer sheath, which can improve the radial water-blocking performance of the cable, prevent external moisture from penetrating into the interior of the cable, and prevent moisture from entering from the surface of the cable. The sheath layer arranged on the outer layer of the cable can prevent moisture from entering the interior of the cable. When the sheath layer is damaged, the internal conductor can also be prevented from short-circuiting the conductor through the water-blocking paste.

[0019] (2) Through the present invention, the outermost layer of the cable is a sheath layer, and the sheath layer includes a corrugated copper sheath and an outer sheath. In the corrugated copper sheath, the corrugated copper sheath is made of a metal structure, which has a physical barrier effect on the gnawing of rats and ants, and can prevent the cable sheath from being damaged. The outer sheath arranged on the outside of the corrugated copper sheath can be added with certain materials for repelling rats and ants during the process of making raw materials, so that the outer sheath can have a certain anti-rat and ant ability. Through the cooperation of the corrugated copper sheath and the outer sheath, the anti-rat and ant function of the entire cable can be guaranteed.

[0020] (3) Through the present invention, the outer sheath arranged on the outer layer of the cable can add anti-ultraviolet agents and anti-aging additives to the raw materials during the manufacturing process, and will not age, crack or deteriorate in performance after being exposed to sunlight for a long time. A glass fiber tape and an oxygen insulation layer are also arranged on the outside of the shielding layer in the cable. Among them, the outer layer is located on the outside of the shielding layer and has excellent flame retardant and fire-resistant properties, which can effectively prevent the spread of flames. The oxygen insulation layer adopts a highly flame retardant and low heat release polyolefin material to isolate the oxygen supply and delay the combustion process. The outer sheath adopts B1 grade flame retardant polyolefin, and the low dripping characteristics prevent the molten droplets in the fire from igniting other equipment. In terms of the overall flame retardancy of the cable, the use of a multi-layer flame retardant design can ensure that the cable meets the B1 grade flame retardant requirements and can ensure a high level of safety in the event of a fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention.

[0022] In the figure: 1-conductor, 2-water blocking paste, 3-inner insulating layer, 4-polypropylene, 5-outer insulating layer, 6-copper wire shielding layer, 7-copper tape, 8-glass fiber tape, 9-oxygen insulation layer, 10-corrugated copper sheath, 11-outer sheath. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below in conjunction with specific embodiments.

[0024] Example 1

[0025] like Figure 1 As shown, a new type of 35kV rail transit waterproof, rat-proof, ant-proof and UV-proof B1-level cable is provided in the middle of the cable. The conductor 1 is formed by twisting multiple copper cores. The shape of the copper core is round, and there are certain gaps between the copper cores. After twisting multiple cables, they can meet the environmental requirements of 35kV high-voltage operation and rail transit use.

[0026] After twisting, the inside of the conductor is provided with a water-blocking paste 2 as a filler. The water-blocking paste 2 fills the gap inside the conductor 1, which can ensure that the conductor has a water-blocking function in the longitudinal direction, reduce the impact on the overall performance of the cable in a humid environment, improve the reliability of the cable in harsh environments, and ensure the performance of the cable itself in some underground areas or humid areas in rail transit.

[0027] An insulating layer is arranged on the outside of the conductor, a shielding layer is arranged on the outside of the insulating layer, a glass fiber tape 8 is arranged on the outside of the shielding layer, an oxygen barrier layer 9 is arranged on the outside of the glass fiber tape 8, and a sheath layer is arranged on the outside of the oxygen barrier layer 9.

[0028] In this embodiment, the insulating layer is made of polypropylene 4 and is fixed to the outside of the conductor 1 in an extruded manner. Figure 1 The insulating layer includes an inner insulating layer 3, a middle insulating layer, and an outer insulating layer 5. The inner insulating layer 3, the middle insulating layer, and the outer insulating layer 5 are all made of polypropylene 4; the material of the middle insulating layer is polypropylene 4, and the material of the inner insulating layer 3 and the outer insulating layer 5 is specifically polypropylene semi-conductive shielding material. The inner insulating layer 3, the middle insulating layer, and the outer insulating layer 5 are all fixed to the outside of the conductor 1 by extrusion. The extrusion method can ensure the uniform thickness of the entire insulating layer, reduce defects, and avoid breakdown caused by local electric field concentration. After the material is melted, it is directly wrapped on the conductor 1, which reduces the gap between the conductor 1 and the insulating layer and improves the insulation performance. In addition, the inner insulating layer 3, the middle insulating layer, and the outer insulating layer 5 can realize multi-layer co-extrusion by extrusion, and the insulating layer 4 is directly extruded on the outside of the conductor 1, reducing the production steps.

[0029] Reference Figure 1 A shielding layer is arranged on the outside of the insulating layer, and the shielding layer includes a copper wire shielding layer 6 and a copper tape 7. The material of the copper wire shielding layer 7 is annealed soft copper wire, and the annealed soft copper wire is fixed on the outside of the cable layer in a sparse winding manner. The copper tape 7 is fixed on the outside of the copper wire shielding layer 6 in a winding manner, and the winding direction of the copper tape 7 is opposite to that of the copper wire shielding layer 6.

[0030] Annealed soft copper wire is annealed copper wire with good flexibility and conductivity. Appropriate gaps are left between the copper wires and wound around the outside of the insulation layer to ensure conductivity while avoiding excessive weight or cost of the cable. The copper wire shielding layer set on the outside of the insulation layer can alleviate the uneven electric field generated by the cable in the studio. In the event of a short circuit or overload, the copper wire shielding layer provides an impedance channel to quickly guide the fault current to the grounding device to ensure the safe operation of the cable.

[0031] The copper tape 7 is made of highly conductive copper tape, which is fixed on the outside of the copper wire shielding layer 7 in a winding manner, and adopts a winding direction opposite to that of the copper wire shielding layer 7. Reverse winding enhances the overall tightness and structural stability of the shielding layer. Ensure that the shielding layer as a whole is stable to prevent the copper wire from loosening due to vibration or external force. The copper tape 7 can cooperate with the copper wire shielding layer 6 to form a double shielding structure to further suppress electromagnetic interference. The copper tape 7 can provide additional mechanical support to enhance the pressure resistance and impact resistance of the shielding layer.

[0032] When the use environment of the cable is relatively complex, the cooperation between the copper wire shielding layer 6 and the copper tape 7 can improve the overall bending and tensile resistance of the cable, thereby ensuring the long-term safe operation of the cable.

[0033] A glass fiber tape 8 is arranged on the outside of the shielding layer. The glass fiber tape 8 is fixed to the outside of the shielding layer by wrapping. The glass fiber tape 8 has good flame retardant and fire resistant properties. The glass fiber tape 8 is made of high temperature resistant glass fiber, has good flame retardant and high temperature resistant properties, and is fixed to the outside of the shielding layer by wrapping, which can ensure uniform and firm coverage. In rail transit, the environment of rail transit has high requirements on the fire resistance of cables. The use of glass fiber tape 8 in the cable can ensure that the cable can still perform the functions of transmitting energy and transmitting signals under fire conditions. In addition, the glass fiber tape 8 can improve the operating reliability of the cable in complex environments.

[0034] An oxygen barrier layer 9 is arranged on the outside of the glass fiber tape 8. The oxygen barrier layer 9 is made of a highly flame-retardant and low heat-releasing polyolefin material, and the polyolefin is fixed on the outside of the glass fiber tape 8 by extrusion. The polyolefin used to make the oxygen barrier layer 9 has been specially modified and has good flame retardant properties and is not easy to support combustion.

[0035] A sheath layer is arranged outside the oxygen-isolating layer 9, and the sheath layer includes a corrugated copper sheath 10 and an outer sheath 11. Figure 1 The corrugated copper sheath 10 is welded into a tubular shape using copper tubes, and is tied into a wavy shape through a mold, which can improve the overall radial water-blocking, flame-retardant, rodent-proof, ant-proof, and bending properties of the cable. The corrugated copper sheath 10 can ensure the stability of the cable for long-term operation in a humid environment, and prevent moisture from entering the cable to cause a short circuit or performance degradation. The corrugated copper sheath 10 does not support combustion under fire conditions, and can also serve as a heat-insulating layer to transfer heat to both ends of the fire point to prevent the fire from spreading to the internal layer structure. Using copper as the main material of the corrugated copper sheath 10 can ensure that rodents and ants are difficult to bite through. The wavy wrinkle design improves the flexibility of the corrugated copper sheath 10, facilitates the installation and bending of the cable in a narrow space, and improves the bending performance of the corrugated copper sheath 10.

[0036] The outer sheath 11 is arranged on the outside of the corrugated copper sheath 10, and is made of B1 grade polyolefin, and is fixed on the outside of the corrugated copper sheath 10 by extrusion, so as to ensure that the outer sheath 11 can be closely attached to the outside of the corrugated copper sheath 10. During the manufacturing process of the outer sheath 11, anti-ultraviolet agent and anti-aging agent are added to the raw materials, so as to ensure that the outer sheath 11 is exposed to the sun for a long time without aging, cracking or performance degradation.

[0037] The basic principles, main features and advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A new type of 35kV rail transit waterproof, rat-proof, ant-proof and UV-proof B1-level cable, including The conductor is formed by twisting a plurality of copper cores. Features: The conductor is filled with water-blocking paste, an insulating layer is arranged on the outside of the conductor, a shielding layer is arranged on the outside of the insulating layer, a glass fiber tape is arranged on the outside of the shielding layer, an oxygen isolation layer is arranged on the outside of the glass fiber tape, and a sheath layer is arranged on the outside of the oxygen isolation layer.

2. A new type of 35kV rail transit waterproof, rat-proof, ant-proof and UV-proof B1-level cable according to claim 1, characterized in that: The insulating layer is made of polypropylene, and the polypropylene is fixed on the outside of the conductor in an extruded manner.

3. A new type of 35kV rail transit waterproof, rat-proof, ant-proof and UV-proof B1 grade cable according to claim 2, characterized in that: Electric shielding materials are also provided on both sides of the insulating layer.

4. A new type of 35kV rail transit waterproof, rat-proof, ant-proof and UV-proof B1 grade cable according to claim 1, characterized in that: The shielding layer comprises a copper wire shielding layer and a copper tape.

5. A new type of 35kV rail transit waterproof, rat-proof, ant-proof and UV-proof B1-level cable according to claim 4, characterized in that: The copper wire shielding layer is annealed soft copper wire, which is fixed on the outside of the insulating layer in a sparsely wound manner.

6. A new type of 35kV rail transit waterproof, rat-proof, ant-proof and UV-proof B1-level cable according to claim 5, characterized in that: The copper tape is fixed on the outside of the copper wire shielding layer in a winding manner, and the winding direction of the copper tape is opposite to that of the copper wire shielding layer.

7. A new type of 35kV rail transit waterproof, rat-proof, ant-proof and UV-proof B1 grade cable according to claim 1, characterized in that: The oxygen barrier layer is polyolefin, and the polyolefin is fixed on the outside of the shielding layer in an extrusion manner.

8. The novel 35kV waterproof, rat-proof, ant-proof and UV-proof B1-grade cable for rail transit according to claim 1 is characterized in that: The sheath layer comprises a corrugated copper sheath and an outer sheath.

9. A new type of 35kV rail transit waterproof, rat-proof, ant-proof and UV-proof B1-level cable according to claim 8, characterized in that: The corrugated copper sheath is welded into a tubular shape by copper tubes and pressed into a corrugated shape by a mold.

10. A new type of 35kV rail transit waterproof, rat-proof, ant-proof and UV-proof B1-level cable according to claim 8, characterized in that: The outer sheath is made of B1 grade polyolefin and is fixed on the outside of the corrugated copper sheath by extrusion.

Images