A flat, fire-resistant, flame-retardant silicone rubber cable

Abstract

This utility model discloses a flat, fire-resistant, silicone rubber flame-retardant cable, relating to the field of cable technology. It includes a cable core composed of multiple sets of parallel-distributed wire cores, each core comprising a conductor, an insulation layer, and a shielding layer. A fire-resistant layer, a flame-retardant layer, and an outer sheath are sequentially disposed outside the cable core. The fire-resistant layer consists of a hardened inner layer and a high-temperature resistant outer layer. The hardened inner layer is a ceramicized silicone rubber layer, and the high-temperature resistant outer layer is a mica tape wrapping layer. The flame-retardant layer consists of a buffer layer and a flame-retardant outer coating layer. The buffer layer is aluminum hydroxide-filled silicone rubber, and the flame-retardant outer coating is an intumescent flame-retardant coating. This solution solves the problems of unstable cable operation in high-temperature environments and performance degradation in complex environments.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, specifically to a flat, fire-resistant, flame-retardant silicone rubber cable. Background Technology

[0002] Flame-retardant cables are cables that, under specified test conditions, when a sample is burned, and after the test fire source is removed, the flame spreads only within a limited range, and the residual flame or embers extinguish themselves within a limited time. They have the ability to prevent or delay the spread of flames and are usually made of special materials such as halogen-containing flame retardants or halogen-free flame retardants.

[0003] For example, the Chinese authorized patent CN217239124U, entitled "A Flame-Retardant Cable," includes multiple conductor bundles, an insulating rock wool layer, multiple layers of stacked inorganic flame-retardant layers, an insulating flame-retardant adhesive layer, and a halogen-free low-smoke polyolefin flame-retardant sheath. The insulating rock wool layer is wound around the outer wall of the multiple conductor bundles, tightly winding the multiple conductor bundles to form the conductor body. The insulating flame-retardant adhesive layer bonds each inorganic flame-retardant layer, improving the overall tensile strength and smoothness of the flame-retardant material layer.

[0004] The aforementioned existing technologies have flame-retardant effects, but the insulating rock wool layer has limited heat insulation performance when facing high-temperature flames, and cannot effectively block heat transfer for a long time, making it difficult to ensure the normal operation of the cable in a fire. Moreover, the combination of multiple layers of inorganic flame-retardant layers and insulating flame-retardant adhesive layers is prone to interlayer separation and performance degradation in complex environments, such as humid and corrosive gas environments, thus failing to meet current needs. In response, we propose a flat fire-resistant silicone rubber flame-retardant cable. Utility Model Content

[0005] The purpose of this invention is to provide a flat, fire-resistant, silicone rubber flame-retardant cable to solve the problems mentioned in the background art, such as the cable's instability in high-temperature environments and its tendency to degrade in complex environments.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a flat, fire-resistant, silicone rubber flame-retardant cable, comprising a cable core, wherein the cable core is composed of multiple sets of parallel-distributed wire cores, each wire core comprising a conductor, an insulation layer, and a shielding layer, wherein a fire-resistant layer, a flame-retardant layer, and an outer sheath are sequentially disposed outside the cable core, wherein the fire-resistant layer comprises a hardened inner layer and a high-temperature resistant outer layer, the hardened inner layer being a ceramicized silicone rubber layer, and the high-temperature resistant outer layer being a mica tape wrapping layer, wherein the flame-retardant layer comprises a buffer layer and a flame-retardant outer coating layer, the buffer layer being EPDM rubber, and the flame-retardant outer coating layer being an intumescent flame-retardant coating.

[0007] Preferably, the conductor is made of multiple strands of high-purity oxygen-free copper wire, the surface of the copper wire is tin-plated, the insulating layer is based on methyl vinyl silicone rubber, with added flame retardants and reinforcing agents, and is coated on the surface of the conductor by vulcanization molding process, and the shielding layer is made of semi-conductive silicone rubber material, and is coated on the outside of the insulating layer by extrusion process.

[0008] Preferably, the hardened inner layer is coated onto the outside of the shielding layer by an extrusion process, and the high-temperature resistant outer layer is spirally wrapped around the outside of the hardened inner layer.

[0009] Preferably, the buffer layer is coated on the outside of the fire-resistant layer by an extrusion process, and the flame-retardant outer coating is applied to the outer wall of the buffer layer.

[0010] Preferably, the outer protective layer is made of wear-resistant silicone rubber, and the surface of the outer protective layer is provided with an anti-oxidation coating. The outer protective layer is covered on the outside of the flame-retardant layer by an extrusion process, and the anti-oxidation coating is sprayed on the surface of the outer protective layer.

[0011] Preferably, the insulating layer and the conductor are tightly bonded together by a vulcanization process, and the shielding layer and the insulating layer are integrally formed by an extrusion process.

[0012] Preferably, the hardened inner layer and the shielding layer are bonded together with an adhesive, and the high-temperature resistant outer layer is tightly bonded to the hardened inner layer.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model employs a double-layer fireproof structure design. The inner ceramicized silicone rubber layer rapidly ceramicizes under high-temperature fire conditions, forming a dense and hard ceramic-like shell that effectively isolates heat from flames. The outer mica tape wrapping layer, with its high temperature resistance, maintains structural stability for an extended period during a fire. This dual protection allows the cable to maintain normal operation for a certain period during a fire, buying valuable time for personnel evacuation, fire rescue, and continuous power supply to critical equipment. Simultaneously, the EPDM rubber in the flame-retardant layer slows heat conduction to the cable's interior under high temperatures; its good flexibility also acts as a buffer when the cable is subjected to external impacts, protecting the internal structure. Combined with the flame-retardant outer coating that expands upon contact with fire to form a heat-insulating carbonized foam layer, the two work synergistically to effectively prevent the spread of flames.

[0015] 2. The conductor of this invention is made of multiple strands of high-purity oxygen-free copper wire, twisted and tin-plated. The tin plating layer not only enhances the conductor's oxidation resistance but also improves its adhesion to the insulation layer. The multi-strand twisted structure disperses bending stress, ensuring conductivity stability. The insulation layer uses methyl vinyl silicone rubber as the base, with added flame retardants and reinforcing agents, and is tightly wrapped around the conductor through high-temperature vulcanization, providing excellent electrical insulation performance. The semi-conductive silicone rubber shielding layer provides a uniform electric field and absorbs electromagnetic interference, ensuring stable power transmission during cable operation and reducing interference to surrounding electronic equipment.

[0016] 3. The wear-resistant silicone rubber layer of the outer sheath of this utility model has good weather resistance, corrosion resistance and mechanical strength, which can effectively resist the friction and scratching of the cable during laying and use, as well as the erosion of complex outdoor environments and corrosive gases; the nano-silica modified organosilicon resin anti-oxidation coating on the surface, with the enhanced density and hardness of nano-silica and the excellent oxidation resistance of organosilicon resin, prevents the aging and cracking of the outer sheath silicone rubber, giving the cable excellent anti-aging ability. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present utility model;

[0018] Figure 2 This is a schematic diagram of the interface structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the refractory layer structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the flame-retardant layer structure of this utility model.

[0021] In the diagram: 1. Cable core; 2. Wire core; 21. Conductor; 22. Insulation layer; 23. Shielding layer; 3. Fire-resistant layer; 31. Hardened inner layer; 32. High-temperature resistant outer layer; 4. Flame-retardant layer; 41. Buffer layer; 42. Flame-retardant outer coating; 5. Outer sheath; 6. Anti-oxidation coating. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Please see Figure 1-4The present invention provides an embodiment of a flat fire-resistant silicone rubber flame-retardant cable, comprising a cable core 1, which is composed of multiple sets of parallel-distributed wire cores 2. Each wire core 2 includes a conductor 21, an insulation layer 22, and a shielding layer 23. The cable core 1 is provided with a fire-resistant layer 3, a flame-retardant layer 4, and an outer sheath 5 in sequence. The conductor 21 is made of multiple strands of high-purity oxygen-free copper wire, and the surface of the copper wire is tin-plated. The insulation layer 22 is based on methyl vinyl silicone rubber, with added flame retardants and reinforcing agents, and is coated on the surface of the conductor 21 by a vulcanization molding process. The shielding layer 23 is made of semi-conductive silicone rubber material and is coated on the outside of the insulation layer 22 by an extrusion process.

[0024] This gives conductor 21 good conductivity and oxidation resistance, multi-strand strands disperse stress, insulation layer 22 provides stable electrical insulation and flame retardant effect, and shielding layer 23 uniform electric field and reduces electromagnetic interference, thereby ensuring the stability and reliability of cable power transmission and avoiding faults caused by electrical problems.

[0025] Please see Figure 1 , Figure 2 and Figure 3 The fire-resistant layer 3 is composed of a hardened inner layer 31 and a high-temperature resistant outer layer 32. The hardened inner layer 31 is a ceramicized silicone rubber layer, and the high-temperature resistant outer layer 32 is a mica tape wrapping layer. The hardened inner layer 31 is wrapped around the outside of the shielding layer 23 by an extrusion process, and the high-temperature resistant outer layer 32 is wrapped around the outside of the hardened inner layer 31 in a spiral manner. The hardened inner layer 31 and the shielding layer 23 are bonded together by an adhesive, and the high-temperature resistant outer layer 32 is tightly attached to the hardened inner layer 31.

[0026] The ceramicized silicone rubber layer forms a hard ceramic shell at high temperatures, and the mica tape wrapping layer, with its high temperature resistance, provides double protection to effectively isolate heat and flames, allowing the cable to continue operating normally for a period of time during a fire, buying valuable time for personnel evacuation and rescue, and greatly improving the fire resistance safety of the cable.

[0027] Please see Figure 1 , Figure 2 and Figure 4 The flame retardant layer 4 is composed of a buffer layer 41 and a flame retardant outer coating 42. The buffer layer 41 is EPDM rubber, and the flame retardant outer coating 42 is an intumescent flame retardant coating. The buffer layer 41 is coated on the outside of the fire-resistant layer 3 by an extrusion process, and the flame retardant outer coating 42 is coated on the outer wall of the buffer layer 41.

[0028] The buffer layer 41 can delay heat conduction to the inside of the cable, and its good flexibility can buffer the cable when it is subjected to external impact, protecting the internal structure. Together with the flame-retardant outer coating 42, which expands to form a heat-insulating carbonized foam layer when exposed to fire, the two work synergistically to effectively prevent the spread of flames.

[0029] Please see Figure 1 and Figure 2 The outer sheath 5 is made of wear-resistant silicone rubber. The surface of the outer sheath 5 is provided with an anti-oxidation coating 6. The outer sheath 5 is covered on the outside of the flame-retardant layer 4 by an extrusion process. The anti-oxidation coating 6 is sprayed on the surface of the outer sheath 5. The wear-resistant silicone rubber outer sheath can resist the friction, scratches and external environmental corrosion of the cable during laying and use. The anti-oxidation coating prevents the silicone rubber outer sheath from aging and cracking. The combination of the two extends the service life of the cable, enables the cable to work stably in complex environments, and reduces maintenance costs and replacement frequency.

[0030] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A flat fire resistant silicone rubber cable comprising a cable core (1), characterised in that: The cable core (1) is composed of a plurality of groups of parallel distributed wire cores (2), the wire core (2) comprises a conductor (21), an insulation layer (22) and a shielding layer (23), the cable core (1) is externally provided with a fireproof layer (3), a flame-retardant layer (4) and an outer protective layer (5) in sequence, the fireproof layer (3) is composed of a hardened inner layer (31) and a high-temperature-resistant outer layer (32), the hardened inner layer (31) is a ceramicized silicone rubber layer, and the high-temperature-resistant outer layer (32) is a mica tape wrapping layer, the flame-retardant layer (4) is composed of a buffer layer (41) and a flame-retardant outer coating layer (42), the buffer layer (41) is a ternary ethylene-propylene rubber, and the flame-retardant outer coating layer (42) is an intumescent flame-retardant coating.

2. A flat fire resistant silicone rubber cable as claimed in claim 1, characterised in that: The conductor (21) is twisted by a plurality of high-purity oxygen-free copper wires, the copper wire surface is subjected to tinning treatment, the insulation layer (22) is coated on the surface of the conductor (21) through a vulcanization forming process, and the shielding layer (23) is made of semi-conductive silicone rubber material and is coated on the outer side of the insulation layer (22) through an extrusion process.

3. A flat fire resistant silicone rubber cable as claimed in claim 1, wherein: The hardened inner layer (31) is coated on the outside of the shielding layer (23) through an extrusion process, and the high-temperature-resistant outer layer (32) is wrapped on the outside of the hardened inner layer (31) in a spiral manner.

4. A flat fire resistant silicone rubber cable as claimed in claim 1, wherein: The buffer layer (41) is coated on the outside of the fireproof layer (3) through an extrusion process, and the flame-retardant outer coating layer (42) is coated on the outer wall of the buffer layer (41).

5. A flat fire resistant silicone rubber cable as claimed in claim 1, wherein: The outer protective layer (5) is made of wear-resistant silicone rubber material, the surface of the outer protective layer (5) is provided with an oxidation-resistant coating layer (6), the outer protective layer (5) is covered on the outside of the flame-retardant layer (4) through an extrusion process, and the oxidation-resistant coating layer (6) is sprayed on the surface of the outer protective layer (5).

6. A flat fire resistant silicone rubber cable as claimed in claim 1, wherein: The insulation layer (22) and the conductor (21) are tightly combined through a vulcanization process, and the shielding layer (23) and the insulation layer (22) are integrally formed through an extrusion process.

7. A flat fire resistant silicone rubber cable as claimed in claim 1, wherein: The hardened inner layer (31) and the shielding layer (23) are bonded through an adhesive, and the high-temperature-resistant outer layer (32) is tightly attached to the hardened inner layer (31).

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