Direct-current inter-tripping fireproof control cable for rail transit
By combining a multi-layered structure with specific materials, the stability problem of rail transit cables in extreme environments has been solved, achieving cable protection under low temperature, earthquake and high humidity conditions, and possessing excellent fire resistance, water resistance and electromagnetic shielding performance.
Patent Information
- Application Number
- CN202422609316.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-10-29
AI Technical Summary
Existing rail transit cables are difficult to meet the requirements of high laying conditions and operating environment, especially in low temperature, earthquake, high altitude and high humidity environments, they cannot effectively protect the cable core.
The cable employs a multi-layered structural design, including a core conductor, conductive foam, low-smoke halogen-free wrapping layer, a metal overall shielding layer, and a waterproof layer. Combined with specific materials such as halogen-free flame-retardant silicone rubber, chlorosulfonated polyethylene, glass fiber, and stainless steel fiber braided armor, it enhances the cable's high-temperature resistance, waterproofing, insect and termite resistance, and electromagnetic shielding performance.
It achieves stable operation of the cable in extreme environments, and has good fire resistance, impact voltage resistance, explosion protection, and electromagnetic interference protection properties. It is suitable for high-frequency torsion and bending in rail transit and can maintain the integrity and functionality of the cable under harsh conditions.
Smart Images
Figure CN223651174U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of control cable technology, specifically to a DC interlocking fireproof control cable for rail transit. Background Technology
[0002] With the continuous acceleration of urbanization and the rapid development of rail transit construction in my country, the demand for rail transit cables is also constantly increasing. Existing rail transit cables generally include a core unit protective layer, which contains several core units, and each core unit contains a cable core; both the core unit protective layer and each core unit are filled with filler material.
[0003] With the application of rail transit, the laying and operating environment conditions for rail transit cables are becoming increasingly demanding. For example, the laying conditions are: minimum ambient temperature of -5℃; earthquake resistance of 8 degrees (a=0.1g); and operating environment conditions of altitude ≤1000m, ambient temperature of -25℃~+45℃, and relative humidity ≤90%. However, existing rail transit cables, relying solely on the cable core unit protective layer, are insufficient to meet these conditions. Utility Model Content
[0004] To address the shortcomings of existing technologies, this utility model provides a DC-connected fireproof control cable for rail transit, which solves the problems in the current background technology.
[0005] To achieve the above objectives, this utility model provides the following technical solution:
[0006] A DC fire-resistant control cable for rail transit includes a cable core conductor, conductive foam, and a low-smoke halogen-free sheath layer. The low-smoke halogen-free sheath layer contains seven cable core units, and each cable core unit contains several cable core conductors symmetrically arranged. A cable core shielding layer is located outside each cable core conductor. A cable core flame-retardant layer is located outside the cable core shielding layer. A cable core insulation layer is located outside the flame-retardant layer. An inner cable sheath is located outside the cable core insulation layer. An insulating filler is located between the outer side of the cable core insulation layer and the inner side of the inner cable sheath. The cable core insulation layer, the insulating filler block, and the inner sheath of the cable core are provided with a flame-retardant filler layer. A low-smoke halogen-free wrapping layer is provided around the inner sheath of the cable core. Conductive foam is provided in the gap between the inner sheath of the cable core and the low-smoke halogen-free wrapping layer. A metal overall shielding layer is provided outside the low-smoke halogen-free wrapping layer. A drain wire is provided between the low-smoke halogen-free wrapping layer and the metal overall shielding layer. A waterproof layer is provided outside the metal overall shielding layer. An armor layer is provided outside the waterproof layer. An outer sheath is provided outside the armor layer.
[0007] Preferably, the cable core shielding layer is made of halogen-free flame-retardant silicone rubber with embedded shielding metal mesh, the cable core flame-retardant layer is made of chlorosulfonated polyethylene material, and the cable core inner sheath is made of polypropylene fiber.
[0008] Preferably, the flame-retardant filler layer is made of glass fiber material.
[0009] Preferably, the total metal shielding layer adopts a double-layer structure of aluminum foil and woven copper mesh.
[0010] Preferably, the waterproof layer is made of neoprene rubber.
[0011] Preferably, the armor layer is made of stainless steel fiber woven armor.
[0012] Preferably, the outer protective layer is made of polyvinyl chloride.
[0013] Compared with the prior art, the beneficial effects achieved by this utility model are:
[0014] This utility model provides a DC interlocking fireproof control cable for rail transit. It features a core shielding layer around the conductor, made of halogen-free flame-retardant silicone rubber with an embedded metal mesh, preventing electromagnetic interference between conductors. The cable also includes a flame-retardant core layer made of chlorosulfonated polyethylene and a flame-retardant filler layer made of glass fiber, giving it excellent high-temperature flame-retardant properties. An inner sheath made of polypropylene fiber provides high strength and good resilience, significantly improving the cable's bending resistance and high-frequency torsion performance. Conductive foam and a metal overall shielding layer further shield against external electromagnetic interference. A drain wire on the outside of the low-smoke halogen-free wrapping layer effectively encloses the internal core units. The cable is more compact, improving its overall strength and EMC performance. A waterproof layer made of neoprene rubber offers excellent waterproofing and high tensile strength, preventing moisture intrusion should the outer layer be damaged. A stainless steel fiber braided armor layer enhances both overall cable strength and flexibility. An outer sheath made of PVC provides strong insect and termite resistance, effectively preventing insects from approaching and damaging the cable. This significantly enhances the cable's resistance to fire, impact voltage, mechanical damage, explosion, electromagnetic interference, mechanical vibration, overload, high temperatures, and insects, making it highly suitable for widespread application. In summary, it can withstand rated voltages below 1KV and operate at ambient temperatures as low as -5℃. It can be laid under seismic intensity of 8 degrees (a=0.1g); it can also operate in environments with altitude ≤1000m, ambient temperature of -25℃~+45℃, and relative humidity ≤90%. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the cross-sectional structure of this utility model.
[0016] Figure 2 for Figure 1 Enlarged view of the local structure at point A.
[0017] In the diagram: 1. Cable core conductor; 2. Cable core shielding layer; 3. Cable core flame retardant layer; 4. Cable core insulation layer; 5. Insulation filler block; 6. Flame retardant filler layer; 7. Cable core inner sheath; 8. Conductive foam; 9. Low smoke halogen-free wrapping layer; 10. Drain wire; 11. Metal overall shielding layer; 12. Waterproof layer; 13. Armoring layer; 14. Outer sheath. Detailed Implementation
[0018] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.
[0019] According to an embodiment of the present invention, a DC-connected fireproof control cable for rail transit is provided.
[0020] Example 1:
[0021] As shown in the attached diagram of the instruction manual. Figure 1 As shown, a DC fire-resistant control cable for rail transit includes a cable core conductor 1, conductive foam 8, and a low-smoke halogen-free sheath layer 9. The low-smoke halogen-free sheath layer 9 contains seven cable core units, and each cable core unit contains several cable core conductors 1 symmetrically arranged. A cable core shielding layer 2 is disposed outside each cable core conductor 1. A cable core flame-retardant layer 3 is disposed outside the cable core shielding layer 2. A cable core insulation layer 4 is disposed outside the cable core flame-retardant layer 3. An inner cable core sheath 7 is disposed outside the cable core insulation layer 4. An insulating filler block 5 is disposed between the outer side of the cable core insulation layer 4 and the inner side of the inner cable core sheath 7. A flame-retardant filling layer 6 is provided in the gap between the cable core insulation layer 4, the insulation filler block 5 and the inner sheath 7 of the cable core. A low-smoke halogen-free wrapping layer 9 is provided around the inner sheath 7 of the cable core. Conductive foam 8 is provided in the gap between the inner sheath 7 and the low-smoke halogen-free wrapping layer 9. A metal overall shielding layer 11 is provided on the outside of the low-smoke halogen-free wrapping layer 9. A drain wire 10 is provided between the low-smoke halogen-free wrapping layer 9 and the metal overall shielding layer 11. A waterproof layer 12 is provided on the outside of the metal overall shielding layer 11. An armor layer 13 is provided on the outside of the waterproof layer 12. An outer sheath 14 is provided on the outside of the armor layer 13.
[0022] The flame-retardant layer 3 of the cable core is made of chlorosulfonated polyethylene material. Chlorosulfonated polyethylene is obtained by chlorination and chlorosulfonation reaction of low-density polyethylene or high-density polyethylene. It is a white or yellow elastomer that can be dissolved in aromatic hydrocarbons and chlorinated hydrocarbons but not in fats and alcohols. It can only swell but not dissolve in ketones and ethers. It has excellent ozone resistance, atmospheric aging resistance, chemical corrosion resistance, and good physical and mechanical properties, aging resistance, heat and low temperature resistance, oil resistance, flame retardancy, wear resistance, and electrical insulation.
[0023] The metal shielding layer 11 adopts a double-layer structure of aluminum foil and woven copper mesh. The double-layer structure of aluminum foil and woven copper mesh can effectively reduce electromagnetic interference and radiation leakage, and the shielding effect can reach more than 95%, so that most electromagnetic radiation cannot penetrate this double-layer shielding structure.
[0024] Example 2:
[0025] As shown in the attached diagram of the instruction manual. Figure 1 and Figure 2 As shown, a DC interlocking fireproof control cable for rail transit features a core shielding layer 2 around the conductor 1. This shielding layer 2 is made of halogen-free flame-retardant silicone rubber with an embedded shielding metal mesh, preventing electromagnetic interference between the conductors 1. A flame-retardant core layer 3 and a flame-retardant filling layer 6 are also included. The flame-retardant core layer 3 is made of chlorosulfonated polyethylene, and the flame-retardant filling layer 6 is made of glass fiber, giving the cable excellent high-temperature flame-retardant properties. An inner sheath 7, made of polypropylene fiber, provides high strength and good resilience, significantly improving the cable's bending resistance and high-frequency torsion performance. Conductive foam 8 and a metal overall shielding layer 11 further shield against external electromagnetic interference. A drain wire 10 is placed outside the low-smoke halogen-free wrapping layer 9 to further enclose the internal core units. The cable is compact, improving its overall strength. The use of the drain wire 10 also enhances its EMC performance. A waterproof layer 12, made of neoprene rubber, provides both waterproofing and high tensile strength, preventing moisture intrusion after damage to the cable's outer layer. An armor layer 13, made of stainless steel fiber braided armor, enhances both the overall strength and flexibility of the cable. An outer sheath 14, made of polyvinyl chloride, provides strong insect and termite resistance, effectively preventing insects from approaching and damaging the cable. This significantly improves the cable's fire resistance, impact voltage resistance, mechanical damage resistance, explosion-proof properties, electromagnetic interference resistance, mechanical vibration resistance, overload resistance, high temperature resistance, and insect and termite resistance, making it highly suitable for widespread application. In summary, the cable can withstand rated voltages below 1KV and operate at a minimum ambient temperature of -5℃. It can be laid under seismic intensity of 8 degrees (a=0.1g); it can also operate in environments with an altitude of ≤1000m, an ambient temperature of -25℃~+45℃, and a relative humidity of ≤90%.
[0026] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.
[0027] In this utility model, unless otherwise explicitly specified and limited, for example, it can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components or an interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0029] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A DC-connected fireproof control cable for rail transit, characterized in that: The cable core includes a conductor (1), conductive foam (8), and a low-smoke halogen-free wrapping layer (9). The low-smoke halogen-free wrapping layer (9) contains seven cable core units. Each cable core unit contains several conductors (1) symmetrically arranged inside. A cable core shielding layer (2) is provided on the outside of each conductor (1). A cable core flame-retardant layer (3) is provided on the outside of the cable core shielding layer (2). A cable core insulation layer (4) is provided on the outside of the cable core flame-retardant layer (3). An inner cable core sheath (7) is provided on the outside of the cable core insulation layer (4). An insulating filler block (5) is provided between the outside of the cable core insulation layer (4) and the inside of the inner cable core sheath (7). The cable core insulation layer (4) and the insulating filler block... (5) A flame-retardant filling layer (6) is provided in the gap between the inner sheath (7) and the core. A low-smoke halogen-free wrapping layer (9) is provided around the inner sheath (7). Conductive foam (8) is provided in the gap between the inner sheath (7) and the low-smoke halogen-free wrapping layer (9). A metal shielding layer (11) is provided on the outside of the low-smoke halogen-free wrapping layer (9). A drain wire (10) is provided between the low-smoke halogen-free wrapping layer (9) and the metal shielding layer (11). A waterproof layer (12) is provided on the outside of the metal shielding layer (11). An armor layer (13) is provided on the outside of the waterproof layer (12). An outer sheath (14) is provided on the outside of the armor layer (13).
2. The DC interlocking fireproof control cable for rail transit according to claim 1, characterized in that: The cable core shielding layer (2) is made of halogen-free flame-retardant silicone rubber with embedded shielding metal mesh, the cable core flame-retardant layer (3) is made of chlorosulfonated polyethylene material, and the cable core inner sheath (7) is made of polypropylene fiber.
3. The DC interlocking fireproof control cable for rail transit according to claim 1, characterized in that: The flame-retardant filler layer (6) is made of glass fiber material.
4. A DC-connected fireproof control cable for rail transit according to claim 1, characterized in that: The total metal shielding layer (11) adopts a double-layer structure of aluminum foil and woven copper mesh.
5. A DC-connected fireproof control cable for rail transit according to claim 1, characterized in that: The waterproof layer (12) is made of neoprene rubber.
6. A DC-connected fireproof control cable for rail transit according to claim 1, characterized in that: The armor layer (13) is made of stainless steel fiber woven armor.
7. A DC-connected fireproof control cable for rail transit according to claim 1, characterized in that: The outer protective layer (14) is made of polyvinyl chloride.