High-flame-retardant signal control cable for rail transit

Abstract

The utility model relates to the technical field of cables, and discloses a high-flame-retardant signal control cable for rail transit, which comprises a conductor, an insulating layer arranged on the outer surface of the conductor, a magneto-rheological elastomer layer arranged on the outer surface of the insulating layer, and a conductive fabric layer arranged on the outer surface of the magneto-rheological elastomer layer. A silicon carbide fiber reinforced ceramic silicone rubber layer is arranged on the outer surface of the conductive fabric layer, an intumescent flame-retardant resin and glass fiber cloth alternating layer is arranged on the outer surface of the silicon carbide fiber reinforced ceramic silicone rubber layer, and an aerogel flame-retardant coating composite layer is arranged on the outer surface of the intumescent flame-retardant resin and glass fiber cloth alternating layer. According to the utility model, the insulating layer is arranged on the outer surface of the conductor, the insulating layer can effectively prevent heat transfer and improve the flame retardant property, the magnetorheological elastomer layer can adaptively shield electromagnetic interference with different intensities, and the conductive fabric layer can shield high-frequency electromagnetic interference. Therefore, the safety and stability of rail transit signal transmission can be improved.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, specifically to a high flame-retardant signal control cable for rail transit. Background Technology

[0002] As an important component of modern urban public transportation, the safety and stability of rail transit are of paramount importance. Signal control cables, as key components for rail transit signal transmission, are responsible for transmitting data such as train operation instructions and monitoring information. In the complex operating environment of rail transit, cables may face the risk of fire caused by high temperatures and electrical faults. Once the cable is damaged by fire, it will lead to the interruption of signal transmission, which will affect the normal operation of the train and even cause serious safety accidents.

[0003] Currently, although existing rail transit signal control cables have certain flame-retardant properties, they are insufficient in terms of insulation performance and anti-interference ability, making it difficult to guarantee the stability and reliability of signal transmission. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a high flame-retardant signal control cable for rail transit, which has advantages such as improving the safety and stability of rail transit signal transmission and solving the problems mentioned in the background art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a high flame-retardant signal control cable for rail transit, comprising a conductor, an insulating layer disposed on the outer surface of the conductor, a magnetorheological elastomer layer disposed on the outer surface of the insulating layer, and a conductive fabric layer disposed on the outer surface of the magnetorheological elastomer layer.

[0008] Preferably, the outer surface of the conductive fabric layer is provided with a silicon carbide fiber-reinforced ceramicized silicone rubber layer.

[0009] The silicon carbide fiber-reinforced ceramicized silicone rubber layer is the inner layer of the gradient composite flame retardant layer. The silicon carbide fiber enhances the mechanical strength and high temperature resistance of the ceramicized silicone rubber. Under high temperature conditions, the ceramicized silicone rubber can quickly ceramicize to form a hard shell, which isolates oxygen and prevents the spread of flames, providing the first high temperature protection barrier for the cable. It is a key component for the cable to achieve high flame retardant performance.

[0010] Preferably, the outer surface of the silicon carbide fiber-reinforced ceramicized silicone rubber layer is provided with alternating layers of intumescent flame-retardant resin and glass fiber cloth.

[0011] Alternating layers of intumescent flame-retardant resin and fiberglass cloth are located in the middle layer of the gradient composite flame-retardant layer. When exposed to fire, the intumescent flame-retardant resin expands to form a foamed char layer, which can effectively isolate heat and oxygen. The fiberglass cloth plays a reinforcing role, improving the strength and stability of the char layer. The two are alternately set up and work together to further prevent the spread of flame inside the cable and enhance the flame-retardant effect of the cable.

[0012] Preferably, the outer surface of the alternating layers of intumescent flame-retardant resin and glass fiber cloth is provided with an aerogel flame-retardant coating composite layer.

[0013] As the outer layer of the gradient composite flame retardant layer, the aerogel flame retardant coating composite layer reduces heat conduction due to its low thermal conductivity, while the flame retardant coating further isolates oxygen and prevents the flame from continuing to burn. This composite layer works in conjunction with the inner and middle layers to achieve efficient flame retardancy from different angles, ensuring the safety of the cable in a fire environment.

[0014] Preferably, the outer surface of the aerogel flame-retardant coating composite layer is provided with a sheath layer.

[0015] The sheath is made of a composite braided material of ultra-high molecular weight polyethylene fiber and high flame retardant polyvinyl chloride, which has high strength, high wear resistance and good weather resistance. It can effectively protect the internal structure of the cable from external mechanical damage, chemical corrosion and environmental factors. At the same time, the annular reinforcing ribs inside the sheath are made of carbon fiber reinforced plastic and are evenly distributed along the cable axis, which further enhances the bending and compressive resistance of the sheath and adapts to the complex installation and use environment of rail transit.

[0016] Preferably, the outer surface of the sheath layer is provided with a superhydrophobic self-cleaning coating.

[0017] A superhydrophobic self-cleaning coating is applied to the surface of the sheath. The micro-nano double rough structure, which mimics the structure of a lotus leaf, allows water droplets to roll on the surface of the sheath and carry away dust and other contaminants, keeping the surface of the sheath clean. This prevents the accumulation of dirt from affecting the heat dissipation and flame retardant performance of the cable, helps to maintain the long-term stable working state of the cable, and extends the service life of the cable.

[0018] Compared with the prior art, this utility model provides a high flame-retardant signal control cable for rail transit, which has the following advantages:

[0019] 1. This utility model utilizes an insulating layer on the outer surface of the conductor, which effectively prevents heat transfer and improves flame retardant performance. The magnetorheological elastomer layer provides adaptive shielding against electromagnetic interference of varying intensities, and the conductive fabric layer shields against high-frequency electromagnetic interference. This, in turn, enhances the safety and stability of rail transit signal transmission.

[0020] 2. This utility model enhances the mechanical strength and high-temperature resistance of the ceramicized silicone rubber by setting a silicon carbide fiber-reinforced ceramicized silicone rubber layer. The alternating layers of intumescent flame-retardant resin and glass fiber cloth, combined with the reinforcing effect of the glass fiber cloth, prevent the spread of flame. The aerogel flame-retardant coating composite layer reduces heat conduction, and the flame-retardant coating further isolates oxygen, thereby achieving a highly efficient flame-retardant effect. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a side sectional view of the present invention.

[0023] The components are: 1. Conductor; 2. Insulating layer; 3. Magnetorheological elastomer layer; 4. Conductive fabric layer; 5. Silicon carbide fiber reinforced ceramicized silicone rubber layer; 6. Alternating layers of intumescent flame retardant resin and glass fiber cloth; 7. Aerogel flame retardant coating composite layer; 8. Sheath layer; 9. Superhydrophobic self-cleaning coating. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-2A high flame-retardant signal control cable for rail transit includes a conductor 1, an insulation layer 2 on the outer surface of the conductor 1, a magnetorheological elastomer layer 3 on the outer surface of the insulation layer 2, and a conductive fabric layer 4 on the outer surface of the magnetorheological elastomer layer 3. Traditional cables often use multi-strand stranded oxygen-free copper wire for the conductor 1. This design uses a stranded conductor 1 with irregular cross-sections, designing the copper wires into trapezoidal, fan-shaped, or other irregular cross-sections. These cross-sections interlock during stranding, increasing the contact area, reducing contact resistance, and minimizing signal transmission loss. Simultaneously, the irregular cross-section structure makes the stress distribution of the conductor 1 bundle more uniform during bending, improving its resistance to bending fatigue. The insulation layer 2 uses an aerogel polymer composite insulation material, with a low-smoke, halogen-free flame-retardant polyolefin matrix filled with nano-aerogel particles. Aerogel has extremely low thermal conductivity, effectively preventing heat loss. The aerogel's porous structure enhances the insulation layer 2's flexibility and buffering properties, while also improving its flame retardant performance. Spiral microchannels filled with phase change material are incorporated within the insulation layer 2. When the cable temperature rises, the phase change material absorbs heat and undergoes a phase change, stabilizing the temperature of the insulation layer 2 and further ensuring insulation performance and signal transmission stability. When the intensity of external electromagnetic interference changes, the magnetorheological elastomer, under the influence of a magnetic field, rapidly aligns its internal magnetorheological particles, altering the material's electromagnetic shielding performance and achieving adaptive shielding against electromagnetic interference of varying intensities. The conductive fabric layer 4 serves as the basic shielding layer, shielding against high-frequency electromagnetic interference. Furthermore, an electromagnetic induction coil is embedded within the shielding layer. The reverse electromagnetic field generated by the induction coil cancels out the external interference electromagnetic field, further enhancing the shielding effect.

[0026] Specifically, such as Figure 2 As shown, a silicon carbide fiber-reinforced ceramicized silicone rubber layer 5 is provided on the outer surface of the conductive fabric layer 4.

[0027] Through the above technical solution, the silicon carbide fiber reinforced ceramicized silicone rubber layer 5 is the inner layer of the gradient composite flame retardant layer. The silicon carbide fiber enhances the mechanical strength and high temperature resistance of the ceramicized silicone rubber. Under high temperature environment, the ceramicized silicone rubber can quickly ceramicize to form a hard shell, isolate oxygen and prevent the spread of flame, providing the first high temperature protection barrier for the cable, and is a key component for the cable to achieve high flame retardant performance.

[0028] Specifically, such as Figure 2 As shown, the outer surface of the silicon carbide fiber reinforced ceramicized silicon rubber layer 5 is provided with alternating layers 6 of intumescent flame retardant resin and glass fiber cloth.

[0029] Through the above technical solution, the alternating layers 6 of intumescent flame retardant resin and glass fiber cloth are located in the middle layer of the gradient composite flame retardant layer. When the intumescent flame retardant resin is exposed to fire, it expands to form a foamed char layer, which can effectively isolate heat and oxygen. The glass fiber cloth plays a reinforcing role, improving the strength and stability of the char layer. The two are set alternately and work together to further prevent the spread of flame inside the cable and enhance the flame retardant effect of the cable.

[0030] Specifically, such as Figure 2 As shown, an aerogel flame-retardant coating composite layer 7 is provided on the outer surface of the alternating layers 6 of intumescent flame-retardant resin and glass fiber cloth.

[0031] Through the above technical solution, the aerogel flame-retardant coating composite layer 7 serves as the outer layer of the gradient composite flame-retardant layer. The aerogel reduces heat conduction due to its low thermal conductivity, while the flame-retardant coating further isolates oxygen and prevents the flame from continuing to burn. This composite layer works in conjunction with the inner and middle layers to achieve efficient flame retardancy from different angles, ensuring the safety of the cable in a fire environment.

[0032] Specifically, such as Figure 2 As shown, a sheath layer 8 is provided on the outer surface of the aerogel flame-retardant coating composite layer 7.

[0033] Through the above technical solution, the sheath layer 8 is made of a composite braided material of ultra-high molecular weight polyethylene fiber and high flame retardant polyvinyl chloride, which has high strength, high wear resistance and good weather resistance. It can effectively protect the internal structure of the cable from external mechanical damage, chemical corrosion and environmental factors. At the same time, the annular reinforcing ribs inside the sheath are made of carbon fiber reinforced plastic and are evenly distributed along the cable axis, which further enhances the bending and compressive resistance of the sheath and adapts to the complex installation and use environment of rail transit.

[0034] Specifically, such as Figure 2 As shown, the outer surface of the sheath layer 8 is provided with a superhydrophobic self-cleaning coating 9.

[0035] Through the above technical solution, the superhydrophobic self-cleaning coating 9 is applied to the surface of the sheath. The micro-nano double rough structure constructed in the shape of a lotus leaf allows water droplets to roll on the surface of the sheath and carry away dust and other contaminants, keeping the surface of the sheath clean. This prevents the accumulation of dirt from affecting the heat dissipation and flame retardant performance of the cable, helps to maintain the long-term stable working state of the cable, and extends the service life of the cable.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high flame retardant signal control cable for rail transportation comprising a conductor (1), characterized in that: The outer surface of the conductor (1) is provided with an insulating layer (2), the outer surface of the insulating layer (2) is provided with a magnetorheological elastomer layer (3), and the outer surface of the magnetorheological elastomer layer (3) is provided with a conductive fabric layer (4).

2. The high flame retardant signal control cable for rail transit according to claim 1, characterized in that: The outer surface of the conductive fabric layer (4) is provided with a silicon carbide fiber reinforced ceramic silicon rubber layer (5).

3. The high flame retardant signal control cable for rail transit according to claim 2, characterized in that: The outer surface of the silicon carbide fiber reinforced ceramic silicon rubber layer (5) is provided with an expanded flame-retardant resin and glass fiber cloth alternating layer (6).

4. The high flame retardant signal control cable for rail transit according to claim 3, characterized in that: The outer surface of the expanded flame-retardant resin and glass fiber cloth alternating layer (6) is provided with an aerogel flame-retardant coating composite layer (7).

5. The high flame retardant signal control cable for rail transit according to claim 4, characterized in that: The outer surface of the aerogel flame-retardant coating composite layer (7) is provided with a sheath layer (8).

6. The high flame retardant signal control cable for rail transit according to claim 5, characterized in that: The outer surface of the sheath layer (8) is provided with a super-hydrophobic self-cleaning coating (9).

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