Special direct-current excitation cable for high-speed maglev train

Abstract

The utility model relates to a direct-current excitation cable special for a high-speed maglev train. The direct-current excitation cable is characterized by being sequentially provided with a wire, a polyester wrapping tape, an insulating layer, a shielding braid layer and an outer sheath from inside to outside, compared with the conventional bunch stranding and total stranding process, the layered concentric stranding process adopted by the lead has the advantages that the pay-off tension of all conductors is uniform, conductor core breakage is avoided, the stable function of the cable is ensured from the performance, the braiding density of the shielding braided layer is not less than 95%, and a strong electromagnetic field can be effectively prevented from escaping to cause greater damage to passengers; the low-smoke halogen-free polyolefin irradiation elastomer material is selected as the outer sheath and the insulating material, and the material does not contain halogen, does not release toxic gas during combustion and has good mechanical property and flame retardant property, and the cable is simple in structural design, has the characteristics of large current, strong short-time overload capacity and the like, and is small in bending radius and high in reliability. The cable has the advantages of vibration resistance, oil resistance, environmental protection and good high-voltage direct-current stability.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a special DC excitation cable for high-speed maglev trains. Background Art

[0002] Currently, superconducting magnetic repulsion maglev trains utilize long-stator synchronous linear motors, characterized by high power, high voltage, high current, and lightweight. The cables required for these motors must possess large cross-sections, high voltage, wear resistance, DC stability, low smoke and halogen-free performance, B1 flame retardancy, Class A fire resistance, and resistance to double oils. Existing cables may only meet some of these performance requirements, with DC stability, double oil resistance, 80% light transmittance, and B1 flame retardancy being difficult to achieve. Furthermore, higher safety and environmental performance requirements are also required. Because cable insulation and sheathing are highly susceptible to heat damage, and conventional materials produce large amounts of toxic gases when burned, causing pollution and harming the health of passengers and staff, further optimization of the structure and materials is required. Summary of the Invention

[0003] In response to the problems mentioned in the background technology, the utility model provides a special DC excitation cable for high-speed maglev trains to meet the use requirements of supporting cables for maglev trains. The cable has a long service life, a large cross-section, high voltage, good DC stability, wear resistance, flame retardancy, fire resistance and double oil resistance.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A DC excitation cable for high-speed maglev trains, characterized in that it is provided with a conductor, a polyester wrapping tape, an insulating layer, a shielding braided layer and an outer sheath in sequence from the inside to the outside;

[0006] The conductor is made of a plurality of Category V annealed tinned soft copper wires which are concentrically twisted in multiple layers through a slant wrapping process;

[0007] The polyester tape is wrapped around the conductor in an overlapping manner, with a thickness of 0.015 mm and an overlapping rate of greater than or equal to 20%;

[0008] The insulating layer is made of low-smoke halogen-free polyolefin irradiated elastomer material, which is extruded on the outside of the polyester tape, and the eccentricity of the insulating layer is less than or equal to 10%;

[0009] The shielding braided layer is woven from 0.2mm-0.3mm tinned round copper wires, with a braiding density greater than or equal to 95%;

[0010] The outer sheath is extruded outside the shielding braided layer and is made of low-smoke halogen-free polyolefin irradiated elastomer material.

[0011] The beneficial effects of the present invention are as follows: the conductor adopts a layered concentric twisting process, which has the advantage of uniform pay-out tension of all conductors compared with the previous bundle twisting + total twisting process, and there will be no conductor core breakage, which ensures the stable function of the cable from the performance point of view. The braiding density of the shielding braided layer is not less than 95%, which can effectively prevent the escape of strong electromagnetic fields and cause greater harm to passengers; the outer sheath and insulation material are selected from low-smoke halogen-free polyolefin irradiated elastomer material, which does not contain halogen and will not release toxic gases when burned. It has good mechanical properties and flame retardant properties. The cable structure is simple in design, has the characteristics of large current and strong short-term overload capacity, small bending radius, vibration resistance, oil resistance, environmental protection and high-voltage DC stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic structural diagram of an embodiment of the present utility model. DETAILED DESCRIPTION

[0013] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Example

[0014] As shown in the figure, a DC excitation cable for high-speed maglev trains is provided, which comprises a conductor 1, a polyester tape 2, an insulating layer 3, a shielding braid 4 and an outer sheath 5 in sequence from the inside to the outside.

[0015] The conductor 1 is made of a plurality of Category V annealed tinned soft copper wires, which are concentrically twisted in multiple layers through a slant wrapping process;

[0016] The polyester tape 2 is wrapped around the conductor in an overlapping manner, with a thickness of 0.015 mm and an overlapping rate of greater than or equal to 20%;

[0017] The insulating layer 3 is made of low-smoke halogen-free polyolefin irradiated elastomer material, which is extruded on the outside of the polyester tape 2. The eccentricity of the insulating layer 3 is less than or equal to 10%.

[0018] The shielding braided layer 4 is woven from 0.2mm-0.3mm tinned round copper wires, with a braiding density greater than or equal to 95%;

[0019] The outer sheath 5 is extruded outside the shielding braided layer 4 and is made of low-smoke halogen-free polyolefin irradiated elastomer material.

[0020] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A DC excitation cable for high-speed maglev trains, characterized by From the inside to the outside, there are conductors, polyester tape, insulation layer, shielding braided layer and outer sheath in sequence; the conductors are made of several fifth-category annealed tinned soft copper wires concentrically twisted in multiple layers through a slant wrapping process; the polyester tape is wrapped around the conductor in an overlapping manner, with a thickness of 0.015mm and an overlap rate greater than or equal to 20%; the insulation layer is a low-smoke halogen-free polyolefin irradiated elastomer material, extruded on the outside of the polyester tape, and the eccentricity of the insulation layer is less than or equal to 10%; the shielding braided layer is woven from 0.2mm-0.3mm tinned round copper wire, with a braiding density greater than or equal to 95%; the outer sheath is extruded outside the shielding braided layer, and is a low-smoke halogen-free polyolefin irradiated elastomer material.

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