Ceramic environment-friendly insulating fireproof low-voltage cable

Abstract

The utility model discloses a ceramic environment-friendly insulating fireproof low-voltage cable, which comprises a cable core, six wire cores which are annularly and spirally wound and distributed are arranged in the cable core, and a plurality of gradient ceramic layers are arranged outside the wire cores. The multi-layer gradient ceramic layer is formed by stacking a base layer, a fireproof layer and a stable layer with different ceramic temperatures layer by layer, the ceramic temperature of an inner layer material is low, the ceramic temperature is gradually increased along with advancing towards an outer layer, a wrapping layer is arranged outside the multi-layer gradient ceramic layer, the wrapping layer is composed of a wrapping inner layer, an enhancement layer and a protection layer, and the protection layer is arranged outside the wrapping inner layer. And an environment-friendly degradable outer sheath is arranged outside the wrapping layer. According to the scheme, the problem that the low-voltage cable is poor in fireproof performance is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a ceramicized environmentally friendly insulating and fireproof low-voltage cable. Background Technique

[0002] Low-voltage cables generally refer to power cables with a rated voltage of 1 kV and below, which are designed for power transmission and distribution at low voltage levels, including but not limited to fields such as lighting, power, and control signal transmission. With their good insulation performance, abrasion resistance, anti-aging property, and flexible installation method, low-voltage cables have become an indispensable infrastructure in modern electrical engineering.

[0003] For example, the Chinese authorized patent "A Low-Voltage Cable" with the publication number CN218631437U includes an outer protection tube. The inner wall of the outer protection tube is fixedly sleeved with a waterproof tube layer, the inner wall of the waterproof tube layer is fixedly sleeved with a heat insulation tube layer, the inner wall of the heat insulation tube layer is fixedly sleeved with a reinforcement tube layer, the inner wall of the reinforcement tube layer is fixedly sleeved with an insulating tube, the inner wall of the insulating tube is fixedly sleeved with a shielding tube layer, and the inner wall of the shielding tube layer is fixedly sleeved with a cable tube layer. By providing an outer protection tube and a cable tube layer on the entire low-voltage cable, the low-voltage cable is protected by the outer protection layer. Through the anti-slip strips and the two limit pads on the anti-slip strips, the connection at the support and positioning part of the low-voltage cable and the low-voltage cable can be anti-slip, making the connection efficiency of the entire low-voltage cable high.

[0004] Although the above-mentioned existing technology can achieve power transmission, in a high-temperature environment, due to poor fire resistance, its own structure is prone to instability, resulting in heat transfer to the core, causing damage to the cable. Therefore, it does not meet the existing requirements. For this reason, we propose a ceramicized environmentally friendly insulating and fireproof low-voltage cable. Content of the Utility Model

[0005] The purpose of the utility model is to provide a ceramicized environmentally friendly insulating and fireproof low-voltage cable to solve the problem of poor fireproof performance of low-voltage cables proposed in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A ceramicized environmentally friendly insulating and fireproof low-voltage cable includes a cable core. Six wire cores are arranged in a circular spiral winding distribution inside the cable core. A multi-layer gradient ceramicized layer is arranged outside the wire cores. The multi-layer gradient ceramicized layer is composed of a base layer, a refractory layer, and a stable layer with different ceramicization temperatures stacked layer by layer. The ceramicization temperature of the inner layer material is lower, and as it advances towards the outer layer, the ceramicization temperature gradually increases. A wrapping layer is arranged outside the multi-layer gradient ceramicized layer. The wrapping layer is composed of a wrapping inner layer, a reinforcing layer, and a protective layer. An environmentally friendly degradable outer sheath is arranged outside the wrapping layer.

[0007] Preferably, the core includes a conductor which is formed by stranding multiple copper single wires. As the conductive body of the cable, an inner insulating layer is provided outside the conductor, and the inner insulating layer is coated on the outside of the conductor through an extrusion equipment.

[0008] Preferably, a filling material is provided at the gap between the cable core and the core.

[0009] Preferably, the base layer is coated on the outside of the cable core through an extrusion process, the fire-resistant layer is fixed on the outer wall of the base layer through an adhesive, and the stabilizing layer is fixed on the outer wall of the fire-resistant layer through an adhesive.

[0010] Preferably, a microporous ceramicized framework is embedded inside the stabilizing layer, and the microporous ceramicized framework is connected to the stabilizing layer by using a co-sintering technology.

[0011] Preferably, the inner wrapping layer is spirally wound around the outside of the multi-layer gradient ceramicized layer, the reinforcing layer is wound around the outer wall of the inner wrapping layer, and the protective layer is spirally wound around the outer wall of the reinforcing layer.

[0012] Preferably, the environmentally friendly degradable outer sheath is made of a transparent material, and a temperature-controlled ceramic fiber mesh is embedded inside the environmentally friendly degradable outer sheath.

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

[0014] 1. By combining the multi-layer gradient ceramicized layer and the microporous ceramicized framework, the cable of the present utility model has a higher fire-resistant temperature and stronger fire-resistant performance, and can maintain the stable operation of the cable under extreme high temperatures. The microporous ceramicized framework structure improves the thermal conductivity and thermal stability of the material, helps to quickly conduct and disperse heat, reduces the damage of high temperature to the internal structure of the cable, and the excellent fire-resistant performance and thermal stability enable the cable to still maintain good performance and stability under harsh environments, thereby extending the service life of the cable.

[0015] 2. By providing a composite fire-resistant wrapping structure composed of an inner wrapping layer, a reinforcing layer and a protective layer, the present utility model has a higher fire-resistant temperature and stronger fire-resistant performance, and can maintain the stable operation of the cable under high temperature or fire conditions. Each layer of wrapping material has good insulation performance, and a more reliable electrical insulation barrier is formed by stacking layer by layer, improving the insulation performance of the cable. The use of the protective layer enhances the mechanical strength of the cable and improves the anti-tensile and anti-compressive performance of the cable during laying, installation and use.

[0016] 3. The utility model is provided with an environmentally friendly degradable outer sheath. By using bio-based materials such as PLA as the outer sheath, which is derived from renewable resources and can be completely degraded into carbon dioxide and water under specific conditions, it conforms to the concept of circular economy and ensures that the impact of the cable on the environment is minimized during waste treatment. At the same time, a temperature-controlled ceramic fiber mesh is embedded. Through certain rare earth oxide-doped ceramic fibers, the fibers can undergo physical or chemical changes when the temperature is abnormal, thus serving as part of a fire warning system to monitor the cable temperature in real time and provide warning signals. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 2 is a front view of the utility model;

[0019] Figure 3 is a cross-sectional view of the internal structure of the utility model;

[0020] Figure 4 is a schematic diagram of the multi-layer gradient ceramization layer structure of the utility model;

[0021] Figure 5 is a schematic diagram of the wrapping layer structure of the utility model.

[0022] In the figure: 1, core; 11, conductor; 12, inner insulation layer; 2, multi-layer gradient ceramization layer; 21, base layer; 22, refractory layer; 23, stabilizing layer; 24, microporous ceramization skeleton; 3, wrapping layer; 31, inner wrapping layer; 32, reinforcing layer; 33, protective layer; 4, environmentally friendly degradable outer sheath; 5, temperature-controlled ceramic fiber mesh; 6, filling material. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0024] Please refer to Figures 1-5 , an embodiment provided by the present utility model: a ceramized environmentally friendly insulating fireproof low-voltage cable, including a cable core. Inside the cable core, six cores 1 are arranged in a circular spiral winding distribution. Outside the core 1, there is a multi-layer gradient ceramization layer 2. The multi-layer gradient ceramization layer 2 is composed of a base layer 21, a refractory layer 22, and a stabilizing layer 23 with different ceramization temperatures stacked layer by layer. The ceramization temperature of the inner layer material is lower, and as it advances outward, the ceramization temperature gradually increases. Outside the multi-layer gradient ceramization layer 2, there is a wrapping layer 3. The wrapping layer 3 is composed of an inner wrapping layer 31, a reinforcing layer 32, and a protective layer 33. An environmentally friendly degradable outer sheath 4 is provided outside the wrapping layer 3.

[0025] Please refer to Figure 3 , the core 1 includes a conductor 11, which is formed by stranding multiple copper single wires and serves as the conductive body of the cable. An inner insulating layer 12 is provided outside the conductor 11, and the inner insulating layer 12 is coated on the outside of the conductor 11 through an extrusion equipment. The inner insulating layer 12 is a ceramizable silicone rubber, which can quickly form a hard ceramic-like shell under high temperature or flame burning conditions, effectively isolating the internal circuit from the invasion of high temperature flames.

[0026] Please refer to Figure 1 , Figure 2 and Figure 3 , a filling material 6 is provided at the gap between the cable core and the core 1. The filling material 6 is a ceramizable fireproof and refractory filling rope, which fills the gap between the cores to improve the stability and fire resistance of the overall structure.

[0027] Please refer to Figure 4 , the base layer 21 is coated on the outside of the cable core through an extrusion process. The refractory layer 22 is fixed on the outer wall of the base layer 21 through an adhesive, and the stabilizing layer 23 is fixed on the outer wall of the refractory layer 22 through an adhesive. The base layer 21 uses a silicone rubber-based ceramizable material with a low ceramization temperature, which has good flexibility and preliminary fire resistance; the refractory layer 22 uses an alumina / silicate composite material with a medium ceramization temperature to provide further fire protection; the stabilizing layer 23 uses an alumina ceramic material with a high ceramization temperature to ensure stability even under extreme high temperatures. Different materials with different ceramization temperatures are stacked layer by layer to form a gradient structure. The ceramicization temperature of the inner layer material is relatively low, and as it progresses towards the outer layer, the ceramicization temperature gradually increases. This design can gradually release and absorb heat during the process of gradually increasing temperature, extending the stable working time of the cable under high temperature.

[0028] Please refer to Figure 4 , a microporous ceramizable skeleton 24 is embedded inside the stabilizing layer 23. The microporous ceramizable skeleton 24 is connected to the stabilizing layer 23 using a co-sintering technology. The material of the microporous ceramizable skeleton 24 is introduced into the stabilizing layer 23, which has a high porosity and interconnected microporous structure. It can form a stable skeleton support during the ceramization process, enhancing the mechanical strength and thermal stability of the protective layer. At the same time, the microporous structure can also improve the thermal conductivity of the material, contributing to the rapid conduction and dispersion of heat. The microporous ceramizable skeleton structure and the stabilizing layer are directly sintered together using a co-sintering technology. At high temperature, both are heated to the sintering temperature simultaneously, enabling atomic-level bonding between them to form a stable overall structure.

[0029] Please refer to Figure 5, the inner wrapping layer 31 is spirally wound around the outside of the multi-layer gradient ceramized layer 2, the reinforcing layer 32 is wound around the outer wall of the inner wrapping layer 31, and the protective layer 33 is spirally wound around the outer wall of the reinforcing layer 32. The inner wrapping layer 31 is a ceramized silicone rubber composite tape, which has good insulation performance, high temperature resistance and chemical stability, and can maintain a stable insulation effect at high temperatures; the reinforcing layer 32 is a nano-reinforced ceramized fiber cloth. By adding nano-particles (such as nano-aluminum oxide, nano-silicon dioxide) to the ceramized fiber, its heat resistance, mechanical properties and flame retardancy are significantly improved; the protective layer 33 is a high-strength ceramized composite tape, which has high strength, high fire resistance and good mechanical properties, and can protect the internal structure of the cable from damage under extreme conditions.

[0030] Please refer to Figure 1 , Figure 2 and Figure 3 , the environmentally degradable outer sheath 4 is made of a transparent material, and a temperature-controlled ceramic fiber mesh 5 is embedded inside the environmentally degradable outer sheath 4. Through ceramic fibers doped with certain rare earth oxides, the fibers can undergo physical or chemical changes (such as color change, resistivity change, etc.) when the temperature is abnormal, so as to be used as part of a fire warning system to monitor the cable temperature in real time and provide warning signals.

[0031] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A ceramized environment-friendly insulating and fireproof low-voltage cable, comprising a cable core, characterized in that: Six wire cores (1) are arranged inside the cable core in a circular spiral winding distribution. A multi-layer gradient ceramization layer (2) is arranged outside the wire core (1). The multi-layer gradient ceramization layer (2) is composed of a base layer (21), a refractory layer (22), and a stabilizing layer (23) with different ceramization temperatures stacked layer by layer. A wrapping layer (3) is arranged outside the multi-layer gradient ceramization layer (2). The wrapping layer (3) is composed of an inner wrapping layer (31), a reinforcing layer (32), and a protective layer (33). An environmentally friendly degradable outer sheath (4) is arranged outside the wrapping layer (3).

2. The environmentally friendly ceramicized insulating and fireproof low-voltage cable according to claim 1, wherein: The wire core (1) includes a conductor (11). The conductor (11) is stranded by multiple copper single wires and serves as the conductive body of the cable. An inner insulation layer (12) is arranged outside the conductor (11), and the inner insulation layer (12) is coated on the outside of the conductor (11) through an extrusion device.

3. The environmentally friendly insulated fireproof low-voltage cable with ceramization according to claim 2, characterized in that: A filling material (6) is arranged at the gap between the cable core and the wire core (1).

4. A ceramifiable environmentally friendly insulating and fireproof low-voltage cable according to claim 1, characterized in that: The base layer (21) is coated on the outside of the cable core through an extrusion process. The refractory layer (22) is fixed on the outer wall of the base layer (21) through an adhesive. The stabilizing layer (23) is fixed on the outer wall of the refractory layer (22) through an adhesive.

5. A ceramifiable environmentally friendly insulating and fireproof low-voltage cable according to claim 4, characterized in that: A microporous ceramization skeleton (24) is embedded inside the stabilizing layer (23), and the microporous ceramization skeleton (24) is connected to the stabilizing layer (23) by a co-sintering technique.

6. A ceramicized environmentally friendly insulating and fireproof low-voltage cable according to claim 1, characterized in that: The inner wrapping layer (31) is spirally wound around the outside of the multi-layer gradient ceramization layer (2). The reinforcing layer (32) is wound around the outer wall of the inner wrapping layer (31). The protective layer (33) is spirally wound around the outer wall of the reinforcing layer (32).

7. A ceramized environmentally friendly insulating and fireproof low-voltage cable according to claim 1, characterized in that: The environmentally friendly degradable outer sheath (4) is made of a transparent material, and a temperature-controlled ceramic fiber mesh (5) is embedded inside the environmentally friendly degradable outer sheath (4).

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