High-flame-retardant cable formed by twisting multiple cores in pair

Abstract

The utility model discloses a multi-core pair-twisted cabled high flame retardant cable, which relates to the technical field of cables, and comprises a cable core, a plurality of groups of mutually twisted wire cores are arranged in the cable core, each wire core consists of a conductor, an inner insulating layer and an inner shielding layer, a reinforced combination layer is arranged outside the cable core, and the reinforced combination layer is arranged outside the cable core. The reinforced combination layer is composed of a fiber reinforced layer, a metal armored reinforced layer and a nano layer, the flame-retardant combination layer is arranged outside the reinforced combination layer and composed of an expansion flame-retardant layer and an inorganic flame-retardant layer, the outer sheath is arranged outside the flame-retardant combination layer, and the flame-retardant combination layer is composed of a flame-retardant layer and an inorganic flame-retardant layer. According to the scheme, the problem that the flame retardant property of the cable is influenced due to reduction of structural stability in a severe environment is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable technical field, concretely is a kind of high flame-retardant cable of multicore pair-twisted cable. BACKGROUND

[0002] Cable is a kind of transmission medium composed of one or more mutually insulated conductors and outer protective material, mainly used for conducting current or signal in electrical system, widely used in power transmission, communication, control system and various electronic equipment connection, with its good conductivity, insulation performance and environmental resistance, ensure the stable, efficient transmission of electric energy and information.

[0003] For example, the Chinese authorized patent "a flame-retardant cable" with announcement number CN215069338U includes support sheet, support shaft, cable, flame-retardant layer, static layer, waterproof layer, corrosion-resistant layer and anti-seismic filler, support sheet is arranged on support shaft, cable is arranged between support sheet, anti-seismic filler is arranged between cable, a layer of flame-retardant layer is arranged outside cable, static layer is arranged on flame-retardant layer, waterproof layer is arranged on static layer, corrosion-resistant layer is arranged on waterproof layer.

[0004] Although the above-mentioned prior art can improve the flame-retardant effect of cable, the stability of cable structure will decrease when applied in harsh environment, which leads to the synchronous decrease of flame-retardant performance, and further affects the high-temperature resistance of cable in high-temperature environment, so it does not meet the existing demand, for this, we propose a high flame-retardant cable of multicore pair-twisted cable. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a kind of high flame-retardant cable of multicore pair-twisted cable to solve the problem that cable in harsh environment is affected by structural stability decrease in the above background technique.

[0006] To achieve the above object, the utility model provides the following technical scheme: a kind of high flame-retardant cable of multicore pair-twisted cable, including cable core, the inside of cable core has multiple groups of inter-twisted wire core, the wire core is composed of conductor, inner insulating layer and inner shielding layer, the outside of cable core is provided with reinforced combination layer, the reinforced combination layer is composed of fiber reinforced layer, metal armor reinforced layer and nanometer layer, the outside of reinforced combination layer is provided with flame-retardant combination layer, the flame-retardant combination layer is composed of intumescent flame-retardant layer, inorganic flame-retardant layer, the outside of flame-retardant combination layer is provided with outer sheath.

[0007] Preferably, the conductor is twisted by multiple single copper wires, the inner insulating layer is extruded on the outside of the conductor, and the inner shielding layer is wrapped on the outer wall of the inner insulating layer.

[0008] Preferably, a reinforcing core is arranged at the center position of the cable core, and the reinforcing core is made of Kayslav material.

[0009] Preferably, the fiber reinforced layer is wrapped into a net shape, wrapped outside the cable core, the metal armor reinforcing layer is spirally wound outside the fiber reinforced layer, and the nanometer layer is fixed on the outer wall of the metal armor reinforcing layer by an adhesive.

[0010] Preferably, the intumescent flame retardant layer is fixed outside the reinforcing combined layer by an adhesive, and the inorganic flame retardant layer is extruded on the outer wall of the intumescent flame retardant layer.

[0011] Preferably, the intumescent flame retardant layer matrix disperses nanometer aluminum oxide in the inside through an in-situ polymerization process.

[0012] Preferably, the gaps of the cable core, the wire core and the reinforcing core are provided with resin filling.

[0013] Compared with the prior art, the utility model has the advantages that:

[0014] 1、The utility model discloses a reinforcing combined layer, high -strength fiber reinforced layer and metal armor reinforcing layer jointly work under the condition, the tensile property of cable is improved significantly, prevent the cable damage caused by external force, and the nanometer composite material reinforcing layer has excellent wear resistance, can effectively prolong the service life of cable, and galvanized steel strip is used as the armored material, can improve the corrosion resistance of cable significantly, is suitable for various severe environment, and high -strength fiber reinforced layer improves the flexibility of cable when keeping the strength of cable, makes it more easily install and lay, and the nanometer clay has the fire -retardant performance, can improve the fire safety of cable to some extent.

[0015] 2、The utility model discloses a flame -retardant combined layer, inorganic flame -retardant layer and intumescent flame -retardant layer jointly work under the condition, form double flame -retardant barrier, effectively prevent the spread of flame, and the penetration of nanometer flame -retardant additive further enhances the flame -retardant performance of cable whole, and the steam and other harmless gas that inorganic flame -retardant material and intumescent flame -retardant agent release in the combustion process help to reduce the generation of smoke and toxic gas, and the carbonaceous foam layer that intumescent flame -retardant layer forms under high temperature can effectively insulate the transmission of heat and oxygen, prolongs the working time of cable in the fire, and the addition of nanometer flame -retardant additive not only improves the flame -retardant performance of cable, but also can keep its mechanical strength and electrical property to some extent, and the selected flame -retardant material is all non - toxic, harmless environmental protection material, meets the requirement of modern cable industry to environmental protection and safety.

[0016] 3、The utility model discloses a flame -retardant outer sheath, through the common effect of nanometer flame -retardant agent and synergistic flame -retardant agent, makes the outer sheath have excellent flame -retardant grade, can effectively prevent the spread of flame, reduces the fire risk, and the thermoplastic elastomer base polymer has good weather resistance, can resist ultraviolet, oxidation and corrosion, prolongs the service life of cable. BRIEF DESCRIPTION OF DRAWINGS

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

[0018] Figure 2 is a schematic view of the internal structure of the utility model;

[0019] Figure 3 is a schematic view of the reinforced combined layer structure of the utility model;

[0020] Figure 4 is a schematic view of the flame-retardant combined layer structure of the utility model.

[0021] In the figure: 1, cable core; 2, wire core; 21, conductor; 22, inner insulation layer; 23, inner shielding layer; 3, reinforcing core; 4, reinforced combined layer; 41, fiber reinforced layer; 42, metal armored reinforced layer; 43, nanometer layer; 5, flame-retardant combined layer; 51, intumescent flame-retardant layer; 52, inorganic flame-retardant layer; 6, outer sheath; 7, resin filling. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0023] Please refer to Figure 1 and Figure 2 The utility model provides an embodiment: a kind of high flame-retardant cable of multicore pair-twisted cable, including cable core 1, the inside of cable core 1 has multiple groups of mutually twisted wire core 2, wire core 2 is composed of conductor 21, inner insulation layer 22 and inner shielding layer 23, conductor 21 is twisted by multiple single copper wires, inner insulation layer 22 is extruded on the outside of conductor 21, inner shielding layer 23 is wrapped on the outer wall of inner insulation layer 22, conductor 21 is twisted by multiple single copper wires, can provide good softness and stability. Each copper wire has higher conductivity, can effectively reduce energy loss, ensure the stable transmission of current;Inner insulation layer 22 is thermoplastic, ensures that cable has the specific function of withstand voltage, provides reliable ground insulation, prevents current leakage;Inner shielding layer 23 is aluminum foil shielding layer, resists the interference brought by electromagnetic field, guarantees the clarity and stability of signal.

[0024] Please refer to Figure 1 and 2, the center of the cable core 1 is provided with a reinforcing core 3, and the reinforcing core 3 is made of Kevlar material, and the gaps of the cable core 1, the wire core 2 and the reinforcing core 3 are provided with resin filling 7, the Kevlar material has high strength and toughness, and placing it as a reinforcing core in the center of the cable core can significantly enhance the overall mechanical strength of the cable. This reinforcing effect helps the cable to maintain structural stability and integrity when subjected to external tension or pressure, thereby improving the durability and service life of the cable, and the resin filling can effectively fix the various parts inside the cable, including the cable core, the wire core and the reinforcing core, further enhancing the overall strength and stability of the cable. In addition, the resin filling can also reduce the axial compression force between the wire cores, thereby improving the fatigue resistance of the cable.

[0025] Please refer to Figure 1 , Figure 2 and Figure 3 , the outside of the cable core 1 is provided with a reinforcing composite layer 4, which is composed of a fiber reinforced layer 41, a metal armor reinforcing layer 42 and a nano layer 43. The fiber reinforced layer 41 is wrapped in a net shape and wrapped outside the cable core 1, the metal armor reinforcing layer 42 is spirally wound on the outer wall of the fiber reinforced layer 41, and the nano layer 43 is fixed on the outer wall of the metal armor reinforcing layer 42 by adhesive. The fiber reinforced layer 41 is made of aramid fiber, which is wrapped in a net shape and has high strength, high modulus, heat resistance and chemical corrosion resistance; the metal armor reinforcing layer 42 is made of galvanized steel strip, which has excellent corrosion resistance and mechanical strength; the nano layer 43 is a thin film formed by compounding nano clay reinforced polymer and nano copper, which has high strength and excellent wear resistance. By adding nano clay particles, the mechanical properties and heat resistance of the polymer are significantly improved, and nano copper can enhance the electrical conductivity and wear resistance of the material.

[0026] Please refer to Figure 1 , Figure 2 and Figure 4 , the outside of the reinforcing composite layer 4 is provided with a flame retardant composite layer 5, which is composed of an intumescent flame retardant layer 51 and an inorganic flame retardant layer 52. The intumescent flame retardant layer 51 is fixed on the outside of the reinforcing composite layer 4 by adhesive, and the inorganic flame retardant layer 52 is extruded on the outer wall of the intumescent flame retardant layer 51. The intumescent flame retardant layer 51 is dispersed with nano aluminum oxide in the inside by in-situ polymerization process, and the permeation layer 51 is nano aluminum oxide uniformly dispersed in the polymer matrix by blending or in-situ polymerization process. The intumescent flame retardant layer 51 is composed of melamine phosphate and polypropylene, which expands rapidly to form a carbon foam layer when exposed to fire; the inorganic flame retardant layer 52 is a dense layer formed by magnesium hydroxide.

[0027] Please refer to Figure 1The outer part of the flame-retardant combined layer 5 is provided with an outer sheath 6, the thermoplastic elastomer is used as a base polymer, and the nano-graphite is added in the inner part, so that the flame-retardant performance of the material is improved, the mechanical strength is maintained or improved, and the synergistic flame retardant such as brominated epoxy resin is added, which cooperates with the nano flame retardant to form a more effective flame-retardant system, and the melt blending technology is adopted to ensure that the nano flame retardant is uniformly dispersed in the polymer matrix.

[0028] It is obvious for those skilled in the art that the present application 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 essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A high flame retardant cable of a multi-core pair stranded cable comprising cable cores (1), characterized in that: The cable core (1) has a plurality of groups of mutually twisted wire cores (2) inside, the wire core (2) is composed of a conductor (21), an inner insulation layer (22) and an inner shielding layer (23), the cable core (1) is externally provided with a reinforcing combined layer (4), the reinforcing combined layer (4) is composed of a fiber reinforced layer (41), a metal armor reinforcing layer (42) and a nano layer (43), the reinforcing combined layer (4) is externally provided with a flame-retardant combined layer (5), the flame-retardant combined layer (5) is composed of an intumescent flame-retardant layer (51) and an inorganic flame-retardant layer (52), the flame-retardant combined layer (5) is externally provided with an outer sheath (6).

2. A high flame retardant cable of a multi-core pair twisted cable assembly according to claim 1, characterized in that: The conductor (21) is twisted by a plurality of single copper wires, the inner insulation layer (22) is extruded on the outer part of the conductor (21), and the inner shielding layer (23) is wrapped on the outer wall of the inner insulation layer (22).

3. A high flame retardant cable of a multi-core pair twisted cable assembly according to claim 2, characterized in that: The reinforcing core (3) is arranged at the center position of the cable core (1) and is made of Kevlar material.

4. A high flame retardant cable of multi-core pair twisted cable assembly as claimed in claim 1, wherein: The fiber reinforced layer (41) is wrapped into a net shape and wrapped on the outer part of the cable core (1), the metal armor reinforcing layer (42) is spirally wrapped on the outer wall of the fiber reinforced layer (41), and the nano layer (43) is fixed on the outer wall of the metal armor reinforcing layer (42) by an adhesive.

5. A high flame retardant cable of multi-core pair twisted cable assembly as claimed in claim 1, wherein: The intumescent flame-retardant layer (51) is fixed on the outer part of the reinforcing combined layer (4) by an adhesive, and the inorganic flame-retardant layer (52) is extruded on the outer wall of the intumescent flame-retardant layer (51).

6. A high flame retardant cable of a multi-core pair twisted cable assembly according to claim 5, characterized in that: The intumescent flame-retardant layer (51) is dispersed with nano aluminum oxide in the inside by an in-situ polymerization process.

7. A high flame retardant cable of multi-core pair twisted cable assembly as claimed in claim 3, wherein: The cable core (1), the wire core (2) and the reinforcing core (3) are provided with resin filling (7) at the gaps.

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