Optoelectrical composite DC cable for urban subway

Abstract

This application relates to a photoelectric composite DC cable for urban subways, comprising a conductor, an insulation layer, optical units, and a protective sheath. The insulation layer is wrapped around the conductor, and an optical unit layer is wrapped around the outer peripheral wall of the insulation layer. The protective sheath is wrapped around the outside of the optical unit layer, and the optical unit layer includes several optical units for transmitting optical signals. The cable integrates the conductor and optical units, and can transmit electrical energy and optical signals simultaneously. This application has good signal transmission capability and meets the power and communication needs of urban subways.

Description

Technical Field

[0001] This application relates to the field of cables, and in particular to a photoelectric composite DC cable for urban subways. Background Technology

[0002] Urban subway DC cables are high-tech products that integrate materials science, electrical engineering and mechanical protection. Their multi-layered structural design and stringent performance indicators ensure the safe operation of the subway system.

[0003] Traditional DC cables used in urban subways typically consist of an annealed copper conductor, an insulation layer (cross-linked polyethylene insulation or ethylene propylene rubber), an inner sheath, a fireproof layer, and an outer sheath. They have advantages such as good electrical performance, good weather resistance, good corrosion resistance, relatively low laying and maintenance costs, and long service life.

[0004] In the future construction and development of urban subways, with the continuous increase in requirements for power transmission and signal transmission, the signal transmission capacity of existing cables is limited and cannot meet the requirements of modern communication, monitoring and other systems. Utility Model Content

[0005] To address the limitations of existing cables in signal transmission capabilities, which make them unsuitable for modern communication and monitoring systems, this application provides a photoelectric composite DC cable for urban subways.

[0006] The present application provides a photoelectric composite DC cable for urban subways, which adopts the following technical solution:

[0007] A photoelectric composite DC cable for urban subways includes a conductor, an insulation layer, an optical unit, and a protective sheath. The insulation layer is wrapped around the conductor, and an optical unit layer is wrapped around the outer peripheral wall of the insulation layer. The protective sheath is wrapped around the outside of the optical unit layer, and the optical unit layer includes optical units for transmitting optical signals.

[0008] By adopting the above technical solution, the insulation layer wraps the conductor, and the optical unit layer is set between the insulation layer and the protective sheath. The cable integrates the conductor and the optical unit, and can transmit electrical energy and optical signals at the same time. It has good signal transmission capability and meets the power and communication needs of urban subways.

[0009] Optionally, the optical unit layer is separated from the insulating layer by a first ceramicized refractory strip, and the optical unit layer is separated from the protective sleeve by a second ceramicized refractory strip.

[0010] By adopting the above technical solution, using the first ceramicized fire-resistant strip and the second ceramicized fire-resistant strip to separate the insulation layer, the optical unit layer and the protective sheath, the fire resistance of the cable can be improved, while providing support for the optical units of the optical unit layer.

[0011] Optionally, the insulating layer is an irradiated cross-linked ethylene propylene rubber insulating layer.

[0012] By adopting the above technical solution and using irradiated cross-linked ethylene propylene rubber as the insulation layer material, the cable has good electrical insulation performance, heat aging resistance and mechanical properties, ensuring stable operation of the cable.

[0013] Optionally, the optical unit layer further includes a stainless steel wire braided spiral armor wrapped around the outer peripheral wall of the first ceramicized refractory strip, and the optical unit is disposed on the stainless steel wire braided spiral armor.

[0014] By adopting the above technical solution, the outer layer of the first ceramicized refractory belt is wrapped with a stainless steel wire woven spiral armor, and the optical unit is installed on the stainless steel wire woven spiral armor, which enhances the mechanical strength and resistance to external damage of the optical unit.

[0015] Optionally, the optical unit includes an optical fiber and a stainless steel tube. The stainless steel tube is spirally wound around the outer peripheral wall of the first ceramicized refractory strip and passes through the stainless steel wire braided spiral armor. The optical fiber passes through the stainless steel tube, and the area enclosed by the optical fiber and the stainless steel tube is filled with filler grease.

[0016] By adopting the above technical solution, the optical fiber is run through a stainless steel tube, and a filling grease is placed in the area enclosed by the optical fiber and the stainless steel tube. The stainless steel tube protects the optical fiber from external mechanical stress and environmental factors, and the filling grease further enhances the protection and buffering effect on the optical fiber, thereby improving the stability and reliability of the optical unit's transmission performance.

[0017] Optionally, a plurality of optical units are provided and are evenly arranged along the circumferential direction of the first ceramicized refractory strip.

[0018] By adopting the above technical solution, multiple optical units are spirally wound and evenly arranged around the circumference, which can ensure stable and efficient optical signal transmission and make full use of cable space.

[0019] Optionally, the protective sleeve is an irradiated cross-linked halogen-free, low-smoke, flame-retardant elastic protective sleeve.

[0020] By adopting the above technical solutions, the irradiated cross-linked halogen-free low-smoke flame-retardant elastic protective sheath ensures that the cable has good fire resistance, plays a protective role of flame retardancy, low smoke, environmental protection and good elasticity, and improves the safety and stability of the cable in urban subway environment.

[0021] Optionally, the conductor is a fifth type of soft copper conductor.

[0022] By adopting the above technical solution and using the fifth type of soft copper conductor, the cable has good flexibility and bending performance, which can adapt to the complex laying environment of urban subways. At the same time, the soft copper conductor has good conductivity, which reduces the resistance of the cable and reduces power loss.

[0023] Optionally, the conductor is wrapped with non-woven fabric.

[0024] By adopting the above technical solution, wrapping the conductor with non-woven fabric can provide a certain degree of protection for the conductor, reduce damage to the conductor from external factors, and ensure the stability of cable performance.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. The cable integrates conductors and optical units, and can transmit electrical energy and optical signals simultaneously. It uses optical fiber to provide a high-speed, high-capacity data channel to transmit a large amount of real-time data such as operating status and monitoring, meeting the power and communication needs of urban subways.

[0027] 2. It can detect optical and electrical signals separately, quickly pinpoint the fault location, and shorten the troubleshooting and power outage time;

[0028] 3. With an outer diameter smaller than that of ordinary cables and signal cables, it is easy to lay in places with limited space, saving space resources. Attached Figure Description

[0029] Figure 1 This is a cross-sectional view of the first embodiment of this application.

[0030] Figure 2 This is a large cross-sectional view of part A of the first embodiment of this application.

[0031] Figure 3 This is a cross-sectional view of the second embodiment of this application.

[0032] Those skilled in the art will understand that the elements in the accompanying drawings are shown for simplicity and clarity and are not necessarily drawn to scale. For example, the size and position of some elements in the drawings may be enlarged relative to other elements to aid in understanding the embodiments of the invention.

[0033] Reference numerals: 1. Conductor; 11. Non-woven fabric; 2. Insulation layer; 21. First ceramicized refractory strip; 3. Optical unit layer; 4. Protective sleeve; 31. Optical unit; 311. Optical fiber; 312. Stainless steel tube; 313. Filling grease; 32. Stainless steel wire braided spiral armor; 5. Second ceramicized refractory strip. Detailed Implementation

[0034] The present application will be further described in detail below with reference to the accompanying drawings.

[0035] The first embodiment of this application discloses a photoelectric composite DC cable for urban subways, referencing... Figure 1 The cable comprises a conductor 1, an insulation layer 2, an optical unit layer 3, and a protective sheath 4. The insulation layer 2 wraps around the outside of the conductor 1, the optical unit layer 3 wraps around the outer periphery of the insulation layer 2, and the protective sheath 4 wraps around the outside of the optical unit layer 3. This layered structure integrates the conductor 1 and the optical unit 31, simultaneously transmitting electrical energy and optical signals, thus improving the cable's signal transmission capability. It eliminates the need for a separate signal cable, meeting the dual needs of power supply and communication in urban subways. During maintenance, optical and electrical signals can be detected separately, quickly pinpointing the fault location and shortening troubleshooting and power outage time. Its smaller outer diameter compared to combinations of ordinary cables and signal cables saves space.

[0036] Reference Figure 1 Conductor 1 is the fifth type of soft copper conductor 1. Conductor 1 is composed of multiple soft round copper wires bundled and twisted together, which has good conductivity, flexibility and bending performance, and is suitable for the complex laying environment of urban subways. The outer peripheral wall of conductor 1 is wrapped with non-woven fabric 11, which provides a certain degree of protection for conductor 1, reduces the damage to conductor 1 caused by external factors, and ensures the stability of cable performance.

[0037] Reference Figure 1 The insulation layer 2 is wrapped around the outside of the nonwoven fabric 11. The insulation layer 2 is an irradiated cross-linked ethylene propylene rubber insulation layer 2. Irradiated cross-linked ethylene propylene rubber has good electrical insulation properties, heat aging resistance and mechanical properties, which can improve the voltage resistance of wires and cables, enhance their mechanical strength and improve their durability.

[0038] Reference Figure 1 and Figure 2 The optical unit layer 3 includes an optical unit 31 and a stainless steel wire braided spiral armor 32. A first ceramicized fire-resistant strip 21 is provided on the outer peripheral wall of the insulation layer 2. The stainless steel wire braided spiral armor 32 is wrapped around the outer peripheral wall of the first ceramicized fire-resistant strip 21. One optical unit 31 is provided. The optical unit 31 is located at the stainless steel wire braided spiral armor 32 and at the outer peripheral wall of the first ceramicized fire-resistant strip 21. The optical unit layer 3 and the protective sleeve 4 are separated by a second ceramicized fire-resistant strip 5. By setting the first ceramicized fire-resistant strip 21 and the second ceramicized fire-resistant strip 5, the fire resistance of the cable is improved, and the first ceramicized fire-resistant strip 21 and the second ceramicized fire-resistant strip 5 provide support for the optical unit 31 of the optical unit layer 3. The spiral armor and the optical unit 31 belong to the same layer to ensure that the cable is round and without protrusions. The stainless steel wire spiral armor enhances the mechanical strength and resistance to external damage of the optical unit 31.

[0039] Reference Figure 1 and Figure 2The optical unit 31 includes an optical fiber 311 and a stainless steel tube 312. The stainless steel tube 312 is spirally wound around the outer peripheral wall of the first ceramicized refractory strip 21 and passes through a stainless steel wire braided spiral armor 32. The optical fiber 311 passes through the stainless steel tube 312, and the area enclosed by the optical fiber 311 and the stainless steel tube 312 is filled with filler grease 313. The stainless steel tube 312 protects the optical fiber 311 from external mechanical stress and environmental factors. The filler grease 313 further enhances the protection and buffering effect on the optical fiber 311, improving the stability and reliability of the transmission performance of the optical unit 31.

[0040] Reference Figure 1 and Figure 2 The protective sleeve 4 is an irradiated cross-linked halogen-free, low-smoke, flame-retardant, elastic protective sleeve 4, which ensures that the cable has good fire resistance, while also providing flame retardant, low-smoke, environmentally friendly, and good elastic protection.

[0041] The first embodiment of this application describes a photoelectric composite DC cable for urban subways. The cable is constructed from the inside out as follows: a conductor 1, an insulation layer 2, a first ceramicized fire-resistant strip 21, an optical unit layer 3, a second ceramicized fire-resistant strip 5, and a protective sleeve 4. The soft copper conductor 1 ensures efficient power transmission, the insulation layer 2 guarantees the cable's electrical safety, the optical unit layer 3 enables stable optical signal transmission, and the protective sleeve 4 and ceramicized fire-resistant strip provide comprehensive protection for the cable, significantly improving its safety and stability in urban subway environments while simultaneously enabling the transmission of both power and signals.

[0042] The second embodiment of this application discloses a photoelectric composite DC cable for urban subways, referencing... Figure 3 Unlike the first embodiment, this embodiment has multiple optical units 31. Six optical units 31 are selected and are evenly arranged along the circumferential direction of the first ceramicized refractory belt 21. The stainless steel tube 312 of each optical unit 31 is connected to the stainless steel wire spiral armor.

[0043] The second embodiment of this application describes the implementation principle of a photoelectric composite DC cable for urban subways: six optical units 31 are spirally wound and uniformly arranged along the circumferential direction of the first ceramicized fire-resistant strip 21, ensuring stable and efficient optical signal transmission. Different numbers of optical units 31 are configured according to actual needs.

[0044] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A photoelectric composite DC cable for urban subways, comprising a conductor (1), an insulation layer (2), an optical unit (31), and a protective sheath (4), characterized in that: The insulating layer (2) is wrapped around the conductor (1), and an optical unit layer (3) is wrapped around the outer peripheral wall of the insulating layer (2). The protective sleeve (4) is wrapped around the outside of the optical unit layer (3). The optical unit layer (3) includes an optical unit (31) for transmitting optical signals.

2. The optoelectronic composite DC cable for urban subways according to claim 1, characterized in that: The optical unit layer (3) is separated from the insulating layer (2) by a first ceramicized refractory strip (21), and the optical unit layer (3) is separated from the protective sleeve (4) by a second ceramicized refractory strip (5).

3. The optoelectronic composite DC cable for urban subways according to claim 1, characterized in that: The insulating layer (2) is an irradiated cross-linked ethylene propylene rubber insulating layer (2).

4. The optoelectronic composite DC cable for urban subways according to claim 2, characterized in that: The light unit layer (3) also includes a stainless steel wire braided spiral armor (32) wrapped around the outer peripheral wall of the first ceramicized refractory strip (21), and the light unit (31) is disposed at the stainless steel wire braided spiral armor (32).

5. The optoelectronic composite DC cable for urban subways according to claim 4, characterized in that: The optical unit (31) includes an optical fiber (311) and a stainless steel tube (312). The stainless steel tube (312) is spirally wound on the outer peripheral wall of the first ceramicized refractory strip (21) and passes through the stainless steel wire braided spiral armor (32). The optical fiber (311) passes through the stainless steel tube (312). The area enclosed by the optical fiber (311) and the stainless steel tube (312) is filled with filler grease (313).

6. The optoelectronic composite DC cable for urban subways according to claim 5, characterized in that: The optical unit (31) is provided in a plurality of units and is evenly arranged along the circumferential direction of the first ceramicized refractory strip (21).

7. The optoelectronic composite DC cable for urban subways according to claim 1, characterized in that: The protective sleeve (4) is an irradiated cross-linked halogen-free low-smoke flame-retardant elastic protective sleeve (4).

8. The optoelectronic composite DC cable for urban subways according to claim 1, characterized in that: The conductor (1) is the fifth type of soft copper conductor (1).

9. The optoelectronic composite DC cable for urban subways according to claim 1, characterized in that: The conductor (1) is wrapped with non-woven fabric (11).

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