A high performance digital signal cable for high speed rail

Abstract

The utility model relates to wire and cable manufacturing technical field, and its purpose lies in providing a kind of high-performance digital signal cable for high speed rail, from inside to outside in turn includes cable core, thermal barrier, protection repair layer, reinforcing composite shielding layer, multiple high flame-retardant sheath, high shielding reinforcing armoring layer and multiple high flame-retardant outer sheath, wherein protection repair layer adopts the foaming band structure with independent cell, cell is filled with special signal transmission medium, when cable is impacted by external force or is flattened, can release transmission medium by cell self-blowing mechanism, automatically establishes or restores signal transmission channel, realizes the self-repair function of cable.Simultaneously, by adopting large cross-section conductor design, the synergistic effect of reinforcing composite shielding layer and high shielding reinforcing armoring layer is combined, so that cable has long-distance transmission capacity, excellent shielding performance, excellent mechanical impact resistance and high-grade flame-retardant safety, can satisfy the use requirement under the complex harsh environment of high-speed railway.

Description

Technical Field

[0001] This utility model belongs to the field of wire and cable manufacturing technology, specifically relating to a high-performance digital signal cable, which is suitable for the connection between relevant equipment and control devices in railway digital signaling systems, realizing the transmission of 1MHz analog signals, 2Mbit / s digital signals, and system control information and electrical energy with rated voltages of AC 750V or DC 1100V and below. Background Technology

[0002] The rapid development of high-speed railways, subways, and urban rail transit has placed extremely high demands on the reliability, stability, and safety of their core transmission medium—digital signal cables. Currently, conventional railway digital signal cables conforming to the TB / T 3100-2017 standard are widely used in this field. However, in actual engineering applications and complex laying environments, existing technologies have revealed many shortcomings. First, the mechanical protection performance of the cables is insufficient. Under long-distance traction or rough construction conditions such as heavy object impacts or crushing, permanent deformation can easily occur. This not only leads to laying difficulties but also causes deterioration of electrical parameters, resulting in increased signal attenuation or even interruption, and high maintenance costs. Second, facing the increasingly complex electromagnetic environment along railway lines, the single aluminum sheath or ordinary shielding structure used in existing cables is no longer sufficient to effectively resist strong external electromagnetic interference and internal signal crosstalk, threatening the accurate transmission of train control commands. Furthermore, in enclosed, densely populated areas such as subways and stations, the flame retardant rating of conventional cables is insufficient in suppressing flame spread and the generation of toxic fumes in the face of real fires, failing to fully meet current fire performance safety standards. In addition, existing cables permanently lose their function after being damaged by external forces and do not have any self-recovery capability, resulting in long fault repair times and seriously affecting traffic efficiency under high-density operation. Utility Model Content

[0003] The purpose of this invention is to provide a high-performance digital signal cable for high-speed rail, in order to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A high-performance digital signal cable for high-speed rail includes a cable core composed of insulated single wires, pairs, and star-shaped four-wire groups twisted together. The cable core is sequentially surrounded by a cable core wrapping tape and a heat insulation layer (8). The heat insulation layer is sequentially surrounded by:

[0006] The protective repair layer is a wrapped foam tape with independent foam cells, each cell filled with a medium for establishing or restoring signal transmission channels when the cable is damaged.

[0007] The reinforced composite shielding layer is a composite tubular shielding layer that covers the outside of the protective and repairing layer;

[0008] The high-shielding reinforced armor layer is an ultra-thick, high-permeability double steel strip armored outside the reinforced composite shielding layer;

[0009] And multiple highly flame-retardant outer sheaths covering the high-shielding reinforced armor layer.

[0010] Between the reinforced composite shielding layer and the high-shield reinforced armor layer, there is also a multi-layer high flame-retardant protective layer, which is an extruded high flame-retardant plastic layer.

[0011] The insulated single wire includes a conductor and an insulation layer extruded over the conductor.

[0012] The conductor has a diameter of 1.4 mm.

[0013] The reinforced composite shielding layer comprises, from the inside out, a plastic-metal composite shielding strip, an extruded insulation layer, and a welded metal alloy layer.

[0014] The high-shielding reinforced armor layer is a double-layer galvanized high-permeability steel strip with gap wrapping.

[0015] When the cable is deformed due to impact or flattening, the foamed tape of the protective repair layer passively releases the medium through the rupture of the foam pores.

[0016] The medium is an insulating gel or an insulating oil.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0018] 1) This utility model significantly reduces signal attenuation by using a 1.4mm large-section conductor, achieving longer-distance and more stable signal transmission. Simultaneously, the unique "protective repair layer" and "high-shield reinforced armor layer" work synergistically to provide the cable with excellent impact and flattening resistance; in particular, the protective repair layer can spontaneously detonate to release the medium and rebuild the signal channel when the cable is damaged, achieving a breakthrough from passively withstanding damage to actively repairing it, greatly ensuring the reliability of construction and operation.

[0019] 2) This utility model adopts a composite shielding system consisting of a "reinforced composite shielding layer" and a "high-permeability armor layer," which can effectively resist various interferences in the complex electromagnetic environment of high-speed rail and ensure signal purity. In addition, the synergistic design of the "multiple high flame-retardant sheaths" and the "outer sheath" makes the cable's flame-retardant rating superior to the national standard, effectively suppressing the spread of flames and the generation of toxic fumes, and providing higher fire safety protection for densely populated enclosed spaces.

[0020] 3) This utility model not only endows the cable with excellent electrical and protective properties, but also ensures the roundness and mechanical strength of the cable structure, making the laying process smoother and improving the long service life of the product in harsh environments, with significant comprehensive value. Attached Figure Description

[0021] Figure 1 This is a cross-sectional schematic diagram of the present invention.

[0022] Figure 2 This is a schematic diagram of the cable core structure in this utility model.

[0023] In the diagram: 1. Cable core; 2. Conductor; 3. Single wire; 4. Pair group; 5. Four-wire group; 6. Cable core wrapping tape; 8. Heat insulation layer; 9. Protective and repair layer; 10. Reinforced composite shielding layer; 11. Multiple high flame retardant protective layers; 12. High shielding reinforced armor layer; 13. Multiple high flame retardant outer sheath. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] To better understand this utility model, the following description is provided:

[0027] like Figure 1-2 As shown, this utility model provides a high-performance digital signal cable for high-speed rail, specifically comprising the following structure:

[0028] 1) Cable Core 1: Cable core 1 is composed of several insulated single wires 3, pair groups 4, star-shaped four-wire groups 5, twisted together, and then wrapped with cable core wrapping tape 6 to form cable core 1; the insulated single wire 3 consists of a conductor 2 and an insulation layer extruded outside the conductor 2, with a conductor diameter of 1.4mm. In existing standard and used railway digital signal cables, only cables with a conductor diameter of 1.0mm are available, while the conductor diameter of this utility model can reach 1.4mm, which can significantly improve signal transmission power and increase the distance of cable signal transmission.

[0029] 2) Insulation layer 8: Extruded outside the cable core 1 to prevent the cable core 1 from being scalded.

[0030] 3) Protective Repair Layer 9: A foamed tape with independent cells is wrapped between the heat insulation layer 8 and the reinforced composite shielding layer 10. Each independent cell contains the medium for signal transmission. This process can be completed separately or simultaneously with the reinforced composite shielding layer 10. It ensures that after damage, the cable's basic structure remains unchanged or only slightly deformed through passive / active self-explosion. It also releases the medium needed to establish a signal transmission channel within a limited space, ensuring stable, normal signal transmission over long distances. The protective repair layer 9 provides support and buffering when the cable is impacted or flattened through passive / active self-explosion, preventing the impact force from directly acting on the cable core or insulated core. This protects the internal structure of the cable from damage while simultaneously releasing the transmission medium to form a transmission channel for stable and uninterrupted signal transmission. The transmission medium is selected from insulating gel or insulating oil, preferably silicone-based insulating gel, silicone oil, mineral oil, or synthetic hydrocarbon insulating oil. This medium can be released when the cable is compressed, maintaining the insulation strength between wire pairs and preventing short circuits.

[0031] 4) Reinforced Composite Shielding Layer 10: A composite tubular shielding layer, consisting of an inner-to-outer plastic-metal composite shielding tape, an extruded (wrapped) insulation layer, and a welded (coated) uncut metal alloy layer, is wrapped around the protective and repair layer 9. Its function is to ensure high shielding performance while forming a stronger metal protective layer, minimizing cable deformation, facilitating smoother cable installation, and maximizing the cable's roundness and aesthetic appeal. Existing standards require aluminum materials for both the cable sheath and the shielding layer, while the shielding layer of this invention uses a composite process, significantly enhancing the cable's shielding, impact resistance, and anti-flattening performance.

[0032] 5) Multiple high flame retardant protective layers 11: Using an extrusion process, plastic with high flame retardant properties is wrapped (in various forms such as wrapping and extrusion) on the outside of the reinforced composite shielding layer 10 to form a mechanical buffer layer of high shielding reinforced armor layer 12.

[0033] 6) High-Shielding Reinforced Armor Layer 12: Utilizing ultra-thick, high-permeability double steel tape gap armor, this layer forms a mechanical protective layer for the cable, enhancing its shielding, impact resistance, and anti-flattening performance. High shielding performance is achieved through the use of high-permeability steel tapes with different coatings. Simultaneously, the thickened steel tape increases the protection of the cable, working in conjunction with the protective repair layer 9 to improve the cable's impact resistance and anti-flattening performance.

[0034] 7) Multiple high flame-retardant outer sheath 13: The outer sheath plastic is wrapped around the steel tape armor layer 12 using an extrusion process to form the outermost outer sheath of the cable. Through the synergistic effect of each layer, the cable has multiple high flame-retardant effects.

[0035] After manufacturing, the cable of this utility model meets the following performance standards: primary parameters (DC resistance, insulation resistance, insulation withstand voltage, working capacitance, capacitive coupling coefficient, and capacitance imbalance to ground, etc.), secondary parameters (characteristic impedance, line pair attenuation, phase angle, etc.), and flame retardant performance. These standards comply with the values ​​specified in TB / T3100-2017 "Railway Digital Signal Cables", GB / T 19666-2019 "General Rules for Flame-Retardant and Fire-Resistant Wires, Cables or Optical Cables", and GB 31247-2014 "Classification of Flame Performance of Cables and Optical Cables". This utility model provides stable long-distance, high-power signal transmission; it also exhibits impact and flattening resistance, allowing the cable to withstand heavy impacts, flattening, and rough handling during construction, with minimal or no deformation, ensuring normal cable laying. Furthermore, it protects the cable from interference from internal and external signal sources and electromagnetic fields, ensuring stable and uninterrupted signal transmission. Finally, the cable's appearance is also optimally preserved.

Claims

1. A high-performance digital signal cable for high-speed rail, comprising a cable core (1) formed by stranding insulated single wires (3), pairs (4), and star-shaped four-wire groups (5), wherein the cable core (1) is provided with a cable core wrapping tape (6) and a heat insulation layer (8) in sequence, characterized in that: The heat insulation layer (8) is provided with the following in sequence: The protective repair layer (9) is a wrapped foam tape with independent foam cells, each of which is filled with a medium for establishing or restoring a signal transmission channel when the cable is damaged. The reinforced composite shielding layer (10) is a composite tubular shielding layer covering the protective and repairing layer (9); The high-shielding reinforced armor layer (12) is an ultra-thick, high-permeability double steel strip armored outside the reinforced composite shielding layer (10); And a multi-layered, highly flame-retardant outer sheath (13) covering the high-shielding reinforced armor layer (12).

2. The high-performance digital signal cable for high-speed rail according to claim 1, characterized in that: Between the reinforced composite shielding layer (10) and the high shielding reinforced armor layer (12), there is also a multi-layer high flame retardant protective layer (11), which is an extruded high flame retardant plastic layer.

3. A high-performance digital signal cable for high-speed rail according to claim 1, characterized in that: The insulated single wire (3) includes a conductor (2) and an insulation layer extruded outside the conductor (2).

4. A high-performance digital signal cable for high-speed rail according to claim 3, characterized in that: The diameter of the conductor (2) is 1.4 mm.

5. A high-performance digital signal cable for high-speed rail according to claim 1, characterized in that: The reinforced composite shielding layer (10) comprises, from the inside out, a plastic-metal composite shielding strip, an extruded insulation layer, and a welded metal alloy layer.

6. A high-performance digital signal cable for high-speed rail according to claim 1, characterized in that: The high-shielding reinforced armor layer (12) is a double-layer galvanized high-permeability steel strip with gap wrapping.

7. A high-performance digital signal cable for high-speed rail according to claim 1, characterized in that: When the cable is deformed due to impact or flattening, the foamed tape of the protective repair layer (9) passively releases the medium through the rupture of the foam pores.

8. A high-performance digital signal cable for high-speed rail according to claim 7, characterized in that: The medium is an insulating gel or an insulating oil.

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