Environment-friendly low-smoke low-toxicity special cable

Abstract

The utility model relates to the technical field of cables, and discloses an environment-friendly low-smoke low-toxicity special cable, which comprises three cable cores, the cable cores are arranged in parallel, the peripheries of the cable cores are attached to one another, and a ceramic bag layer is arranged on the outer side of each cable core. The inner periphery of the ceramic bag layer is filled with an inorganic high-temperature-resistant filling layer located between the peripheries of the cable cores, the periphery of the ceramic bag layer is provided with a steel wire armor layer, the periphery of the steel wire armor layer is provided with a low-smoke halogen-free silicon ceramic adhesive heat insulation layer, the periphery of the low-smoke halogen-free silicon ceramic adhesive heat insulation layer is provided with a galvanized steel strip layer, and the outer periphery of the galvanized steel strip layer is provided with a high-temperature-resistant filling layer. The cable has excellent heat resistance and good electric insulation performance, can effectively prevent current leakage and electric breakdown, is high in safety when an extreme condition occurs, can slow down the flame diffusion trend, is low in generation of toxic smoke during combustion, and reduces the harm of a fire disaster to the health of people.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to an environmentally friendly low-smoke and low-toxic special cable. Background Art

[0002] With the increasing number of important engineering facilities such as subways, power plants, nuclear power plants, tunnels, and crowded places such as high-rise buildings, smart communities, and large supermarkets, these places require fire-resistant cables to have not only general fire-resistant functions, but also low-smoke, halogen-free, high light transmittance, and low toxicity. Because in public fires, 80% of casualties are caused by inhaling a large amount of smoke or toxic gases produced during combustion, and smoke is not conducive to the evacuation of personnel.

[0003] At present, according to the requirements of GB50016-2014 "Code for Fire Protection Design of Buildings" and GB51348-2019 "Code for Electrical Design of Civil Buildings", certain specific places must meet both B1 level and fire protection requirements. Traditional cables cannot meet this requirement, resulting in large smoke production and poor fire resistance in the event of a fire. This will cause great difficulties for personnel evacuation and rescue, and even cause a large number of casualties.

[0004] To this end, we propose environmentally friendly low-smoke and low-toxic special cables. Utility Model Content

[0005] The purpose of the utility model is to provide an environmentally friendly low-smoke and low-toxic special cable to solve the problem that the traditional cables proposed in the above background technology produce a large amount of smoke and have poor fire resistance when a fire occurs, which will cause great difficulties for the evacuation and rescue of personnel and even cause a large number of casualties.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an environmentally friendly low-smoke and low-toxic special cable, comprising a cable core, wherein the number of the cable cores is set to three, the cable cores are arranged in parallel with each other and the outer circumferences are fitted to each other, a ceramic bag layer is arranged on the outer side of the cable core, the inner circumference of the ceramic bag layer is filled with an inorganic high-temperature resistant filling layer located between the outer circumferences of the cable core, a steel wire armor layer is arranged on the outer circumference of the ceramic bag layer, a low-smoke halogen-free silicon ceramic glue insulation layer is arranged on the outer circumference of the steel wire armor layer, a galvanized steel belt layer is arranged on the outer circumference of the low-smoke halogen-free silicon ceramic glue insulation layer, and a low-toxic, low-heat-release, environmentally friendly polyolefin sheath layer is arranged on the outer circumference of the galvanized steel belt layer.

[0007] To ensure the tensile strength and compressive resistance of the cable, the steel wire armor layer is evenly distributed between the ceramic bag layer and the low-smoke halogen-free silicone ceramic adhesive insulation layer, and the ceramic bag layer is composed of a mixture of ceramic particles, high-temperature adhesives and refractory materials, and the low-smoke halogen-free silicone ceramic adhesive insulation layer is composed of a mixture of silicone ceramic adhesive and low-smoke halogen-free particles. When the steel wire armor layer is inserted between the ceramic bag layer and the low-smoke halogen-free silicone ceramic adhesive insulation layer, the steel wire armor layer can fit tightly with the gelatinous, unsolidified ceramic bag layer and the low-smoke halogen-free silicone ceramic adhesive insulation layer, providing the cable with strong tensile strength. The galvanized steel belt layer is spirally wrapped around the outer periphery of the low-smoke halogen-free silicone ceramic adhesive insulation layer, and can fit tightly with the low-smoke halogen-free silicone ceramic adhesive insulation layer, providing compressive protection for the cable.

[0008] Preferably, the cable core comprises a copper conductor, a three-in-one synthetic mica layer and a cross-linked polyethylene insulation layer, the three-in-one synthetic mica layer is attached to the outer periphery of the copper conductor, and the cross-linked polyethylene insulation layer is attached to the outer periphery of the three-in-one synthetic mica layer.

[0009] The cross-linked polyethylene insulation layer has excellent heat resistance, can remain stable at high temperatures, is not easy to soften or melt, has good electrical insulation properties, can effectively prevent current leakage and electrical breakdown, and ensure the safety and reliability of the cable at work. At the same time, it has good mechanical strength and tensile resistance, can withstand large stretching and pressure, is not easy to deform or rupture, and can ensure the normal use of the cable under extreme conditions.

[0010] Preferably, the three-in-one synthetic mica layer is filled with mica particles and glass fibers.

[0011] The synthetic mica layer is a mixture of mica, glass fiber and silicone resin. Silicone resin, as a high-temperature and fire-resistant organic matter, can also enhance the bonding force between mica particles and glass fibers, so that the cable has good high-temperature and fire-resistant properties.

[0012] Preferably, the interior of the inorganic high temperature resistant filling layer is filled with silicate particles and borate particles.

[0013] The inorganic high temperature resistant filling layer is filled between the cable core and the ceramic bag layer. It is a mixture of inorganic materials such as silicate particles, borate particles and silicone resin, and has excellent high temperature resistance and fire resistance.

[0014] Preferably, the steel wire armor layer includes a plurality of steel wires, and the steel wires are spirally distributed about the axis of the steel wire armor layer and attached to the outer periphery of the ceramic bag layer.

[0015] Preferably, the low-smoke zero-halogen silicone ceramic adhesive thermal insulation layer is formed by mixing silicone ceramic adhesive and low-smoke zero-halogen particles.

[0016] The low-smoke halogen-free silicone ceramic adhesive insulation layer is a mixture of silicone ceramic adhesive and low-smoke halogen-free particles. Silicone ceramic adhesive is an organic silicon compound based on a silicon-oxygen chain structure, which has good high temperature resistance, electrical insulation and chemical stability, forming a solid insulation layer that effectively prevents flame propagation and heat conduction. Combined with low-smoke halogen-free particles, the material produces less smoke and does not contain halogen when the flame propagation is extended. When a fire occurs, it can reduce the generation of toxic smoke and reduce the harm of fire to personnel health.

[0017] Preferably, the galvanized steel strip layer is spirally wound around the outer periphery of the low-smoke halogen-free silicon ceramic adhesive insulation layer.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] 1. The utility model has a three-in-one synthetic mica layer, a cross-linked polyethylene insulation layer, an inorganic high-temperature resistant filling layer and a ceramic bag layer, and has multiple functional stacking, so that the cable has excellent heat resistance and good electrical insulation performance, can effectively prevent current leakage and electrical breakdown, ensure the safety and reliability of the cable at work, and can also work normally for a period of time in extreme cases, reserving enough time for emergency circuit switching.

[0020] 2. The utility model provides an inorganic high-temperature resistant filling layer and a low-smoke halogen-free silicone ceramic adhesive insulation layer, and inorganic salt particles and low-smoke halogen-free particles respectively mixed with silicone resin and silicone ceramic adhesive, which can improve the high-temperature resistance of the cable on the one hand, and prevent the spread of flames on the other hand, slow down the trend of flame spread, and effectively reduce the generation of toxic smoke during combustion, thereby reducing the harm of fire to personnel health. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 2 It is an end section view of the utility model;

[0023] Figure 3 This is an end cross-sectional view of the cable core of the utility model.

[0024] In the figure: 1. Cable core; 11. Copper conductor; 12. Three-in-one synthetic mica layer; 13. Cross-linked polyethylene insulation layer; 2. Inorganic high-temperature resistant filling layer; 3. Ceramic bag layer; 4. Steel wire armor layer; 5. Low-smoke and halogen-free silicon ceramic glue insulation layer; 6. Galvanized steel belt layer; 7. Low-toxic, low-heat-release, environmentally friendly polyolefin sheath layer. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Example

[0027] See also Figure 1-Figure 3 The environmentally friendly low-smoke and low-toxic special cable shown in the figure includes a cable core 1. The number of cable cores 1 is set to three. The cable cores 1 are arranged in parallel with each other and the outer peripheries are bonded to each other. A ceramic bag layer 3 is arranged on the outer side of the cable core 1. The ceramic bag layer 3 is composed of a mixture of ceramic particles, high-temperature adhesives and refractory materials. The inner periphery of the ceramic bag layer 3 is filled with an inorganic high-temperature resistant filling layer 2 located between the outer peripheries of the cable core 1. A steel wire armor layer 4 is arranged on the outer periphery of the ceramic bag layer 3. The steel wire armor layer 4 is evenly distributed between the ceramic bag layer 3 and the low-smoke halogen-free silicon ceramic adhesive insulation layer 5. A low-smoke halogen-free silicon ceramic adhesive thermal insulation layer 5 is arranged on the periphery of the steel wire armor layer 4. The steel wire armor layer 4 can be tightly fitted with the unsolidified ceramic bag layer 3 and the low-smoke halogen-free silicon ceramic adhesive thermal insulation layer 5 to provide the cable with strong tensile strength. The galvanized steel belt layer 6 is spirally wound around the low-smoke halogen-free silicon ceramic adhesive thermal insulation layer 5 and can be tightly fitted with the low-smoke halogen-free silicon ceramic adhesive thermal insulation layer 5 to provide compressive protection for the cable. A galvanized steel belt layer 6 is arranged on the periphery of the low-smoke halogen-free silicon ceramic adhesive thermal insulation layer 5, and a low-toxic, low-heat-release, environmentally friendly polyolefin sheath layer 7 is arranged on the periphery of the galvanized steel belt layer 6.

[0028] Furthermore, the cable core 1 includes a copper conductor 11, a three-in-one synthetic mica layer 12 and a cross-linked polyethylene insulation layer 13. The three-in-one synthetic mica layer 12 is attached to the outer periphery of the copper conductor 11, and the cross-linked polyethylene insulation layer 13 is attached to the outer periphery of the three-in-one synthetic mica layer 12. The cross-linked polyethylene insulation layer 13 has excellent heat resistance, can remain stable at high temperatures, is not easy to soften or melt, has good electrical insulation properties, can effectively prevent current leakage and electrical breakdown, and ensure the safety and reliability of the cable at work. At the same time, it has good mechanical strength and tensile resistance, can withstand large stretching and pressure, is not easy to deform or rupture, and can ensure the normal use of the cable under extreme conditions.

[0029] Furthermore, the three-in-one synthetic mica layer 12 is filled with mica particles and glass fibers. The synthetic mica layer is a mixture of mica, glass fibers and silicone resin. Silicone resin, as a high-temperature resistant and fire-resistant organic matter, can also enhance the bonding force between mica particles and glass fibers, so that the cable has good high-temperature resistance and fire-resistant properties.

[0030] Furthermore, the interior of the inorganic high temperature resistant filling layer 2 is filled with silicate particles and borate particles. The inorganic high temperature resistant filling layer 2 is filled between the cable core 1 and the ceramic bag layer 3. It is a mixture of inorganic materials such as silicate particles, borate particles and silicone resin, and has excellent high temperature resistance and fire resistance.

[0031] Furthermore, the steel wire armor layer 4 includes a plurality of steel wires, and the steel wires are spirally distributed about the axis of the steel wire armor layer 4 and attached to the outer periphery of the ceramic bag layer 3 .

[0032] Furthermore, the low-smoke halogen-free silicone ceramic glue insulation layer 5 is formed by mixing silicone ceramic glue and low-smoke halogen-free particles. The low-smoke halogen-free silicone ceramic glue insulation layer 5 is formed by mixing silicone ceramic glue and low-smoke halogen-free particles. Silicone ceramic glue is an organic silicon compound based on a silicon-oxygen chain structure, which has good high temperature resistance, electrical insulation performance and chemical stability, forming a solid insulation layer, which effectively prevents flame propagation and heat conduction. Combined with low-smoke halogen-free particles, the material produces less smoke and does not contain halogen when the flame propagation combustion is prolonged, which can reduce the generation of toxic smoke when a fire occurs and reduce the harm of fire to personnel health.

[0033] Furthermore, the galvanized steel strip layer 6 is spirally wound around the outer periphery of the low-smoke halogen-free silicon ceramic adhesive insulation layer 5. The galvanized steel strip layer 6 is a layer of zinc plated on the surface of the metal strip to improve the corrosion resistance of the metal strip and extend its service life. It can also enhance the mechanical properties of the metal strip, such as tensile strength, compressive strength and hardness, and improve its durability and bearing capacity.

[0034] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Environmentally friendly low-smoke and low-toxic special cables, characterized by: The invention comprises a cable core (1), wherein the number of the cable cores (1) is set to three, the cable cores (1) are arranged in parallel with each other and their outer circumferences are bonded to each other, a ceramic bag layer (3) is arranged on the outer side of the cable core (1), the inner circumference of the ceramic bag layer (3) is filled with an inorganic high temperature resistant filling layer (2) located between the outer circumferences of the cable core (1), a steel wire armor layer (4) is arranged on the outer circumference of the ceramic bag layer (3), a low-smoke halogen-free silicon ceramic adhesive thermal insulation layer (5) is arranged on the outer circumference of the low-smoke halogen-free silicon ceramic adhesive thermal insulation layer (5), a galvanized steel belt layer (6) is arranged on the outer circumference of the galvanized steel belt layer (6), and a low-toxic, low-heat-release, environmentally friendly polyolefin sheath layer (7) is arranged on the outer circumference of the galvanized steel belt layer (6).

2. The environmentally friendly low-smoke and low-toxic special cable according to claim 1 is characterized by: The cable core (1) comprises a copper conductor (11), a three-in-one synthetic mica layer (12) and a cross-linked polyethylene insulation layer (13); the three-in-one synthetic mica layer (12) is attached to the outer periphery of the copper conductor (11), and the cross-linked polyethylene insulation layer (13) is attached to the outer periphery of the three-in-one synthetic mica layer (12).

3. The environmentally friendly low-smoke and low-toxic special cable according to claim 2 is characterized by: The steel wire armor layer (4) comprises a plurality of steel wires, and the steel wires are distributed in a spiral shape about the axis of the steel wire armor layer (4) and are attached to the outer periphery of the ceramic bag layer (3).

4. The environmentally friendly low-smoke and low-toxic special cable according to claim 2 is characterized by: The galvanized steel strip layer (6) is spirally wound around the outer periphery of the low-smoke halogen-free silicon ceramic thermal insulation layer (5).

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