Waterproof flame-retardant cable

Abstract

The utility model discloses a waterproof flame-retardant cable, which relates to the technical field of power transmission equipment and comprises a conductor, an insulating layer fixedly arranged on the outer side of the conductor, an isolating layer fixedly arranged on the outer side of the insulating layer, a winding layer fixedly arranged on the outer side of the isolating layer and a shielding layer fixedly arranged on the outer side of the winding layer. A sheath layer is fixedly arranged on the outer side of the shielding layer, the isolating layer is formed by extruding ceramic polyolefin, and the winding layer is formed by wrapping a ceramic silicone rubber tape. The flexibility and compressive strength of the ceramic silicone rubber tape and the high strength of the ceramic polyolefin isolation layer after ceramic treatment can significantly reduce the probability of deformation and fracture of the cable due to mechanical impact in a fire, and maintain the structural integrity of the cable. The ceramic polyolefin and the ceramic silicone rubber tape can be ceramic at a high temperature, thereby effectively blocking the high temperature, guaranteeing that the cable maintains power transmission for a long time in a fire disaster, avoiding line faults caused by the high temperature, and improving the stability of power supply in a fire disaster scene.

Description

Technical Field

[0001] This utility model relates to the technical field of power transmission equipment, specifically to a water-resistant and flame-retardant cable. Background Technology

[0002] In power transmission equipment, the primary function of medium-voltage fire-resistant cables is to maintain normal operation for a certain period under dangerous and special conditions such as fires, thereby ensuring the stability of critical power supply. Currently, the design of commonly available medium-voltage fire-resistant cables typically focuses on the outer shell, primarily using various flame-retardant materials and tightly wrapping different flame-retardant layers around the cable body in a layered, interlocking manner. These flame-retardant layers do indeed provide a certain degree of protection for the cable. When exposed to a fire source, the flame-retardant layer can effectively inhibit the spread of flames, preventing the cable from becoming continuously burning and thus ensuring the basic integrity of the cable in the early stages of a common fire.

[0003] However, in real fire scenarios, the situation is much more complex. Cables not only have to withstand high temperatures, but also face mechanical impacts caused by the fire, such as the collapse and compression of building structural components, as well as water spraying during firefighting.

[0004] Existing cables lack high-strength protective and support structures, making them prone to deformation under mechanical impact. Slight deformation may affect current transmission efficiency, while severe deformation may cause the cable to break, resulting in a circuit breaker. This not only prevents normal power supply but also poses a new fire hazard due to the electrical sparks generated by the short circuit. Utility Model Content

[0005] This invention provides a water-resistant and flame-retardant cable, which can solve the problems of existing cables lacking high-strength protective and support structures, being prone to deformation under high-temperature conditions and mechanical impact, and the possibility that slight deformation may affect current transmission efficiency and severe deformation may lead to cable breakage.

[0006] A water-resistant and flame-retardant cable includes a conductor, an insulation layer fixedly disposed on the outside of the conductor, an isolation layer fixedly disposed on the outside of the insulation layer, a winding layer fixedly disposed on the outside of the isolation layer, a shielding layer fixedly disposed on the outside of the winding layer, and a sheathing layer fixedly disposed on the outside of the shielding layer. The isolation layer is extruded from ceramicized polyolefin, and the winding layer is wrapped with ceramicized silicone rubber tape, with two wrapping layers.

[0007] As a further embodiment of this utility model: the sheath layer is extruded from neoprene rubber material.

[0008] As a further embodiment of this invention, the shielding layer is formed by extrusion of a semi-conductive polyolefin.

[0009] As a further embodiment of this invention, the insulating layer is formed by extrusion of cross-linked polyethylene material.

[0010] As a further embodiment of this invention, the cross-section of the insulating layer is circular.

[0011] As a further aspect of this invention, the conductor is made of copper.

[0012] As a further embodiment of this utility model: the conductor includes a cable core, and the cable core is provided with a plurality of strands arranged in a matrix.

[0013] As a further embodiment of this utility model, the cable core is arranged tangentially to the adjacent cable core.

[0014] As a further embodiment of this invention, the insulation layer is filled in the gaps between multiple cable cores.

[0015] As a further embodiment of this utility model, the cable core is made of several strands of annealed copper wire twisted together.

[0016] The advantages of this utility model compared to the prior art are:

[0017] 1. Both the ceramicized polyolefin insulating layer and the ceramicized silicone rubber tape winding layer can be ceramicized at high temperatures, effectively blocking high temperatures and ensuring that the cable maintains power transmission for a long time during a fire, avoiding line faults caused by high temperatures, and greatly improving the stability of power supply in fire scenarios.

[0018] 2. The flexibility and compressive strength of the ceramicized silicone rubber tape, as well as the high strength of the ceramicized polyolefin isolation layer after ceramicization, can significantly reduce the probability of cable deformation and breakage due to mechanical impacts such as the collapse and compression of building structural components during a fire, thus maintaining the integrity of the cable structure.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0021] Figure 1 This is a three-dimensional structural diagram of a water-resistant and flame-retardant cable.

[0022] Figure 2 This is a schematic cross-sectional view of the insulating layer in this utility model.

[0023] Figure 3This is a cross-sectional view of the cable structure in this utility model.

[0024] The reference numerals in the figures include:

[0025] 1. Conductor; 2. Insulation layer; 3. Separation layer; 4. Wrapping layer; 5. Shielding layer; 6. Sheath layer; 7. Cable core. Detailed Implementation

[0026] The specific embodiments of this utility model are described in detail below, but it should be understood that the protection scope of this utility model is not limited to the specific embodiments.

[0027] like Figures 1 to 3 As shown, a water-resistant and flame-retardant cable includes a conductor 1, an insulation layer 2 fixedly disposed on the outside of the conductor 1, an isolation layer 3 fixedly disposed on the outside of the insulation layer 2, a winding layer 4 fixedly disposed on the outside of the isolation layer 3, a shielding layer 5 fixedly disposed on the outside of the winding layer 4, and a sheath layer 6 fixedly disposed on the outside of the shielding layer 5. The isolation layer 3 is extruded from ceramicized polyolefin, and the winding layer 4 is wrapped with ceramicized silicone rubber tape, with two wrapping layers.

[0028] When the power supply is normal, the current flows into the conductor 1, which is made of copper. The multiple cable cores 7 in the conductor 1 (made of several strands of annealed copper wire twisted together) are responsible for conducting the current. The insulation layer 2 is extruded from cross-linked polyethylene material. Its cross-section is circular and tightly wraps the conductor 1, which can isolate the current and prevent leakage.

[0029] In special circumstances such as fires, the insulating layer 3 (extruded from ceramicized polyolefin) undergoes a ceramic transformation at high temperatures, forming a hard ceramic structure that blocks the transmission of flames and heat inward, protecting the internal structure. The winding layer 4 is formed by wrapping two layers of ceramicized silicone rubber tape. On the one hand, it can also transform into a ceramic state at high temperatures, working synergistically with the insulating layer 3 to enhance fire resistance; on the other hand, due to its inherent flexibility and certain compressive strength, it can withstand some mechanical impacts in a fire, reducing the risk of cable deformation.

[0030] The shielding layer 5 is extruded from semi-conductive polyolefin, which can suppress the interference of the internal electromagnetic field of the cable to the outside world, and at the same time prevent the external electromagnetic field from interfering with the internal signal of the cable, thus ensuring the stability of power transmission. The outermost sheath layer 6 is extruded from neoprene rubber, which has good water resistance, weather resistance and mechanical strength, and can prevent external moisture and humidity from corroding the cable. In the event of a fire, it can also resist mechanical damage to a certain extent.

[0031] Both the ceramicized polyolefin insulating layer 3 and the ceramicized silicone rubber tape winding layer 4 can be ceramicized at high temperatures, effectively blocking high temperatures and ensuring that the cable maintains power transmission for a long time during a fire, avoiding line failures caused by high temperatures, and greatly improving the stability of power supply in fire scenarios.

[0032] The flexibility and compressive strength of the ceramicized silicone rubber tape, along with the high strength of the ceramicized polyolefin separator layer 3 after ceramicization, can significantly reduce the probability of cable deformation and breakage due to mechanical impacts such as the collapse and compression of building structural components during a fire, thus maintaining the integrity of the cable structure.

[0033] In some specific embodiments, the sheath layer 6 is extruded from neoprene rubber. Neoprene rubber has a dense molecular structure, low air permeability and water absorption, forming a waterproof barrier to prevent moisture from penetrating into the internal layers of the cable. Simultaneously, its good mechanical properties can buffer the impact of external mechanical forces on the internal structure of the cable.

[0034] The sheath layer 6, made of neoprene rubber, greatly enhances the cable's water resistance and extends its service life in humid environments; it also improves the cable's resistance to external mechanical damage and better protects the internal structure in complex environments such as fire scenes.

[0035] In some specific embodiments, the shielding layer 5 is extruded from a semi-conductive polyolefin. The conductive particles in the semi-conductive polyolefin material can guide the electromagnetic field generated inside the cable and shield it within a certain range. At the same time, it reflects and absorbs external interfering electromagnetic fields, reducing the impact on the current transmission inside the cable.

[0036] The shielding layer 5, made of semi-conductive polyolefin material, can ensure that power transmission is not affected by external electromagnetic interference, improve the stability and reliability of power transmission, and meet the requirements of application scenarios with strict electromagnetic environment requirements, such as hospitals and electronic equipment rooms.

[0037] In some specific embodiments, the insulating layer 2 is extruded from cross-linked polyethylene material. Cross-linked polyethylene has high insulation resistance and dielectric strength, which can effectively isolate the current in conductor 1 and prevent current leakage into the surrounding environment.

[0038] The insulation layer 2, made of cross-linked polyethylene, provides reliable insulation performance, ensuring safe operation of the cable and reducing power loss. Cross-linked polyethylene also has good heat resistance and mechanical properties, and can withstand certain temperature changes and external forces, improving the overall stability of the cable.

[0039] In some specific embodiments, the insulation layer 2 has a circular cross-section. The circular structure distributes stress evenly in all directions, better dispersing stress when the cable is subjected to external compression or tension, thus preventing damage to the insulation layer 2 due to localized stress concentration. Simultaneously, the circular insulation layer 2 allows for a uniform distribution of the electric field within it, reducing electric field distortion and improving insulation performance.

[0040] The circular structure can enhance the mechanical stability of the insulation layer 2, reduce the risk of insulation failure caused by external forces, optimize the electric field distribution, improve the electrical insulation performance of the cable, and ensure the safety of power transmission.

[0041] In some specific embodiments, the conductor 1 is made of copper. Copper has good electrical conductivity, its atomic structure allows electrons to move freely within it, it has low resistance, and it can efficiently conduct current, reducing energy loss during transmission.

[0042] The conductor 1, made of copper, ensures that the cable has low resistance, achieves efficient power transmission, and reduces energy waste; copper has high mechanical strength, which can resist external forces such as tension during cable laying and use to a certain extent, ensuring the structural stability of conductor 1.

[0043] In some specific embodiments, the conductor 1 includes cable cores 7, of which several are arranged in a matrix. The multiple cable cores 7 increase the cross-sectional area of ​​the conductor 1, thereby improving the current-carrying capacity of the cable. The matrix arrangement ensures uniform distribution of the cable cores 7, which facilitates even heat dissipation and avoids localized overheating.

[0044] The multiple cable cores arranged in a matrix can meet the transmission requirements of large currents and are suitable for applications with large power loads; they promote uniform heat distribution, improve the heat dissipation performance of the cable, and enhance the stability and reliability of the cable under high load operation.

[0045] In some specific embodiments, the cable core 7 is arranged tangentially to adjacent cable cores 7. This arrangement reduces the overall volume of the conductor 1 while maintaining current carrying capacity, resulting in a more compact cable structure. Furthermore, this arrangement facilitates the uniform distribution of current among the cable cores 7.

[0046] It improves the current-carrying capacity of the cable within a limited space, making the cable lighter and easier to lay and install; it promotes uniform current distribution, avoids overheating of some cable cores due to uneven current distribution, and extends the service life of the cable.

[0047] In some specific embodiments, the insulation layer 2 fills the gaps between multiple cable cores 7, further enhancing the insulation protection of the cable cores 7 and preventing leakage between the cable cores 7. At the same time, the filling insulation material can act as a buffer, reducing mutual friction between the cable cores 7 caused by vibration or external forces.

[0048] It enhances the internal insulation performance of the cable, improves the safety of cable operation, reduces wear between cable cores 7, and extends the service life of the cable, especially suitable for occasions where the cable may be subjected to external forces such as vibration.

[0049] In some specific embodiments, the cable core 7 is made of several strands of annealed copper wire twisted together. Annealing reduces the hardness of the copper wires, increases their flexibility, and makes it easier to twist multiple strands together. The twisted structure increases the flexibility of the conductor 1, facilitating cable bending and laying, while also improving the mechanical strength of the conductor 1.

[0050] It facilitates cable installation and wiring, and is suitable for occasions requiring frequent bending or laying in complex environments; it improves the mechanical strength of conductor 1, reduces the risk of conductor 1 breaking due to external forces, and ensures the continuity of power transmission.

[0051] To facilitate understanding of the embodiments of this solution by those skilled in the art, the working principle of the embodiments of this solution will now be explained in conjunction with specific application scenarios:

[0052] When the power supply is normal, the current flows into the conductor 1, which is made of copper. The multiple cable cores 7 in the conductor 1 (made of several strands of annealed copper wire twisted together) are responsible for conducting the current. The insulation layer 2 is extruded from cross-linked polyethylene material. Its cross-section is circular and tightly wraps the conductor 1, which can isolate the current and prevent leakage.

[0053] In special circumstances such as fires, the insulating layer 3 (extruded from ceramicized polyolefin) undergoes a ceramic transformation at high temperatures, forming a hard ceramic structure that blocks the transmission of flames and heat inward, protecting the internal structure. The winding layer 4 is formed by wrapping two layers of ceramicized silicone rubber tape. On the one hand, it can also transform into a ceramic state at high temperatures, working synergistically with the insulating layer 3 to enhance fire resistance; on the other hand, due to its inherent flexibility and certain compressive strength, it can withstand some mechanical impacts in a fire, reducing the risk of cable deformation.

[0054] The shielding layer 5 is extruded from semi-conductive polyolefin, which can suppress the interference of the internal electromagnetic field of the cable to the outside world, and at the same time prevent the external electromagnetic field from interfering with the internal signal of the cable, thus ensuring the stability of power transmission. The outermost sheath layer 6 is extruded from neoprene rubber, which has good water resistance, weather resistance and mechanical strength, and can prevent external moisture and humidity from corroding the cable. In the event of a fire, it can also resist mechanical damage to a certain extent.

[0055] Both the ceramicized polyolefin insulating layer 3 and the ceramicized silicone rubber tape winding layer 4 can be ceramicized at high temperatures, effectively blocking high temperatures and ensuring that the cable maintains power transmission for a long time during a fire, avoiding line failures caused by high temperatures, and greatly improving the stability of power supply in fire scenarios.

[0056] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. A water-resistant and flame-retardant cable, comprising a conductor (1), characterized in that, An insulating layer (2) is fixedly disposed on the outside of the conductor (1), an isolation layer (3) is fixedly disposed on the outside of the insulating layer (2), a winding layer (4) is fixedly disposed on the outside of the isolation layer (3), a shielding layer (5) is fixedly disposed on the outside of the winding layer (4), and a sheath layer (6) is fixedly disposed on the outside of the shielding layer (5). The isolation layer (3) is extruded from ceramicized polyolefin, and the winding layer (4) is wrapped with ceramicized silicone rubber tape, with two wrapping layers.

2. The water-resistant and flame-retardant cable as described in claim 1, characterized in that, The sheath layer (6) is extruded from neoprene rubber material.

3. The water-resistant and flame-retardant cable as described in claim 1, characterized in that, The shielding layer (5) is extruded from a semi-conductive polyolefin.

4. The water-resistant and flame-retardant cable as described in claim 1, characterized in that, The insulating layer (2) is extruded from cross-linked polyethylene material.

5. A water-resistant and flame-retardant cable as described in claim 4, characterized in that, The insulating layer (2) has a circular cross-section.

6. The water-resistant and flame-retardant cable as described in claim 1, characterized in that, The conductor (1) is made of copper.

7. A water-resistant and flame-retardant cable as described in claim 1, characterized in that, The conductor (1) includes a cable core (7), which has several strands arranged in a matrix.

8. A water-resistant and flame-retardant cable as described in claim 7, characterized in that, The cable core (7) is arranged tangentially to the adjacent cable core (7).

9. A water-resistant and flame-retardant cable as described in claim 7, characterized in that, The insulation layer (2) fills the gaps between the multiple cable cores (7).

10. A water-resistant and flame-retardant cable as described in claim 7, characterized in that, The cable core (7) is made of several strands of annealed copper wire twisted together.

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