Fireproof enhanced three-core aluminum alloy cable

Abstract

The utility model discloses a fire-resistant reinforced three-core aluminum alloy cable, which comprises a cable core formed by twisting three aluminum alloy wire cores and AFRP reinforced filling core materials together, each aluminum alloy wire core comprises a fiber resin-based composite core, and two to three layers of rare earth high-iron aluminum alloy fan-shaped conductors are twisted around the fiber resin-based composite core to form an aluminum alloy conductor layer. A modified silicone rubber ceramic mica fireproof composite belt longitudinal wrapping layer, a high-temperature glass fiber wire wrapping layer and an ethylene propylene diene monomer insulating layer are sequentially wrapped outside the aluminum alloy conductor layer, and a high-temperature fireproof belt wrapping fire insulation layer and an EVA sheath layer are sequentially wrapped outside the cable core. The cable core is round in structure and high in mechanical strength, effectively inhibits conductive carbides from permeating into the conductor side during combustion, and enhances the fireproof performance.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, and particularly to a fire-resistant enhanced 3-core aluminum alloy cable. Background Art

[0002] Medium and low voltage fire-resistant cables are applicable to transmission cables for power transmission and distribution lines in important places such as high-rise buildings, subways, and tunnels. Ordinary fire-resistant cables form a fire-resistant layer by spirally winding high-temperature fire-resistant tapes such as mica tapes around the conductor. The lapping rate of winding is generally between 20% and 40%. It is easy to generate gaps between the conductor and the fire-resistant layer. When a fire breaks out and burns, conductive carbides are extremely easy to penetrate into the conductor, and the fire-resistant performance is not ideal, reducing the fire-resistant grade of the cable. Content of the Utility Model

[0003] In view of the deficiencies of the prior art, the technical problem to be solved by the utility model is to provide a fire-resistant enhanced 3-core aluminum alloy cable with a round cable core structure and high mechanical strength, which can effectively inhibit the penetration of conductive carbides to the conductor side during combustion and enhance the fire-resistant performance.

[0004] The above technical problem of the utility model is solved by the following technical solutions.

[0005] The fire-resistant enhanced 3-core aluminum alloy cable includes a cable core formed by stranding three aluminum alloy wire cores and an AFRP reinforced filler core material together. The aluminum alloy wire core includes a fiber resin-based composite core. Two to three layers of rare earth high-strength aluminum alloy sector conductors are stranded around the outside of the fiber resin-based composite core to form an aluminum alloy conductor layer. An outer longitudinal wrapping layer of a modified silicone rubber ceramized mica fire-resistant composite tape, a high-temperature fiberglass wire wrapping layer, and an ethylene propylene diene monomer (EPDM) insulation layer are sequentially coated on the outside of the aluminum alloy conductor layer. The outer longitudinal wrapping layer of the modified silicone rubber ceramized mica fire-resistant composite tape is a longitudinal lapping wrapping structure of the modified silicone rubber ceramized mica fire-resistant composite tape with a lapping rate of not less than 50%. The high-temperature fiberglass wire wrapping layer is formed by spirally winding a plurality of high-temperature fiberglass wires around the outside of the outer longitudinal wrapping layer of the modified silicone rubber ceramized mica fire-resistant composite tape. The winding direction of the high-temperature fiberglass wire, the winding direction of the modified silicone rubber ceramized mica fire-resistant composite tape, and the stranding direction of the cable core are the same. A high-temperature fireproof tape wrapping fire separation layer and an EVA sheath layer are sequentially coated on the outside of the cable core.

[0006] Preferably, the fiber resin-based composite core is formed by stranding a plurality of glass fiber composite cores. The glass fiber composite core includes a stainless steel single wire. A plurality of glass fiber core materials are arranged around the outside of the stainless steel single wire and hardened by impregnating epoxy resin to form a composite core body. A PET coating layer is coated on the outside of the composite core body.

[0007] Preferably, the rare earth high-strength aluminum alloy sector conductor is formed by stranding and compacting a plurality of rare earth high-strength aluminum alloy wires into a sector conductor structure, and the diameter of the rare earth high-strength aluminum alloy wire is 0.1 mm to 0.3 mm.

[0008] Preferably, the stranding direction of the rare earth high-speed railway aluminum alloy wire is opposite to that of the cable core.

[0009] Preferably, polyimide adhesive layers are coated on the inner end faces of both sides of the longitudinal overlap of the modified silicone rubber ceramized mica fire-resistant composite tape.

[0010] Preferably, the high-temperature fireproof tape wrapping fire separation layer is a high-temperature fireproof tape overlapping wrapping structure with an overlapping rate of 20% to 40%. The high-temperature fireproof tape is a three-layer bonded structure of a cross-linked polyethylene resin inner layer, a mica tape core layer, and a cross-linked polyethylene resin outer layer.

[0011] Preferably, the lay length of the cable core is 15 to 30 times the outer diameter of the aluminum alloy wire core.

[0012] Preferably, the AFRP reinforced filler core material is composed of several aramid twisted wires stranded together. The aramid twisted wire is composed of several aramid fibers stranded together and hot melt bonded with thermoplastic polyurethane resin into one body.

[0013] Advantages of the present utility model:

[0014] 1. A longitudinally wrapped layer of modified silicone rubber ceramized mica fire-resistant composite tape is added between the aluminum alloy conductor layer and the insulating layer. The modified silicone rubber ceramized mica fire-resistant composite tape has excellent fire-resistant and heat-insulating characteristics. The fire-resistant layer structure is optimized to be a longitudinal overlapping wrapping structure of the modified silicone rubber ceramized mica fire-resistant composite tape with an overlapping rate of not less than 50%, effectively avoiding the generation of gaps in the fire-resistant layer. At the same time, adding a high-temperature glass fiber wire wrapping layer is beneficial to preventing the longitudinal overlapping wrapping structure of the modified silicone rubber ceramized mica fire-resistant composite tape from loosening. When the insulating layer melts, it prevents conductive carbides from infiltrating into the conductor through the gaps, strengthens the fire-resistant characteristics, and plays an excellent fire-resistant role.

[0015] 2. By adopting a fiber resin-based composite core and a rare earth high-speed railway aluminum alloy sector conductor to form a fiber resin-based aluminum alloy conductor structure, replacing the traditional steel core aluminum stranded conductor. The fiber resin-based composite core aluminum stranded wire has better mechanical, thermal, and electrical properties than the traditional aluminum stranded conductor. It is lightweight, has higher strength. Under the same outer diameter as the steel core aluminum stranded wire, it increases the aluminum conduction area, greatly reduces the line loss, has a small coefficient of linear expansion, and has a small arc within the operating temperature range from the lowest temperature to the highest temperature. It is more corrosion-resistant than the steel core structure, extends the service life, and has better durability.

[0016] 3. An AFRP reinforced filler core material is added inside the cable core. The mechanical strength and tensile elastic modulus of the AFRP reinforced filler core material are greater than those of the aramid fiber filler core material. It can effectively withstand the tensile force when the cable undergoes repeated bending, helps to inhibit the deformation of the cable core structure, ensures stable electrical characteristics, and has better durability. Description of the Drawings

[0017] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings described below are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of an embodiment of the present application.

[0019] In the figure: 1 - aluminum alloy wire core, 2 - AFRP reinforced filling core material, 3 - fiber resin-based composite core, 4 - rare earth high-strength aluminum alloy sector conductor, 5 - longitudinally wrapped layer of modified silicone rubber ceramized mica fire-resistant composite tape, 6 - high-temperature fiberglass wire wrapped layer, 7 - ethylene propylene diene monomer (EPDM) insulation layer, 8 - high-temperature fireproof tape wrapped fire separation layer, 9 - ethylene-vinyl acetate (EVA) sheath layer. Specific embodiments

[0020] The following will further describe the present utility model in detail through specific embodiments in combination with the drawings.

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model are clearly and completely described in combination with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model.

[0022] As Figure 1 shown, the fire-resistant enhanced 3-core aluminum alloy cable of the embodiment of the present utility model includes a cable core formed by the combined stranding of three aluminum alloy wire cores 1 and AFRP reinforced filling core materials 2. Further, the AFRP reinforced filling core material 2 is formed by the stranding of several aramid twisted yarns, and the aramid twisted yarns are formed by the stranding of several aramid fibers and are hot melt bonded with thermoplastic polyurethane resin into one body. The stranding pitch of the cable core is 15 to 30 times the outer diameter of the aluminum alloy wire core 1. The aluminum alloy wire core 1 includes a fiber resin-based composite core 3. Specifically, the fiber resin-based composite core 3 is formed by the stranding of several glass fiber composite cores. The glass fiber composite core includes a stainless steel monofilament, and several glass fiber core materials are arranged around the outside of the stainless steel monofilament and hardened by impregnating epoxy resin to form a composite core body. A PET coating layer is coated on the outside of the composite core body. Two to three layers of rare earth high-strength aluminum alloy sector conductors 4 are stranded around the outside of the fiber resin-based composite core 3 to form an aluminum alloy conductor layer. Further, the rare earth high-strength aluminum alloy sector conductor 4 is formed by the stranding of several rare earth high-strength aluminum alloy wires and is tightly pressed into a sector conductor structure, and the diameter of the rare earth high-strength aluminum alloy wire is 0.1 mm to 0.3 mm. The stranding direction of the rare earth high-strength aluminum alloy wire is opposite to the stranding direction of the cable core.

[0023] An external layer of the aluminum alloy conductor layer is successively coated with a longitudinally wrapped layer 5 of a modified silicone rubber ceramized mica fire-resistant composite tape, a wound layer 6 of high-temperature fiberglass wire, and an ethylene propylene diene monomer (EPDM) insulating layer 7. The longitudinally wrapped layer 5 of the modified silicone rubber ceramized mica fire-resistant composite tape is a longitudinally overlapping and winding structure of the modified silicone rubber ceramized mica fire-resistant composite tape, and the overlapping rate is not less than 50%. Polyimide adhesive layers are coated on the inner end faces of both ends of the longitudinal overlap of the modified silicone rubber ceramized mica fire-resistant composite tape. The wound layer 6 of high-temperature fiberglass wire is formed by winding a plurality of high-temperature fiberglass wires spirally outside the longitudinally wrapped layer 5 of the modified silicone rubber ceramized mica fire-resistant composite tape. The winding direction of the high-temperature fiberglass wire, the winding direction of the modified silicone rubber ceramized mica fire-resistant composite tape, and the stranding direction of the cable core are the same. An external layer of the cable core is successively coated with a fireproof tape wound fire separation layer 8 and an EVA sheath layer 9. In one embodiment, the fireproof tape wound fire separation layer 8 is a lapping and winding structure of the fireproof tape, and the overlapping rate is 20% to 40%. The fireproof tape is a three-layer bonded structure of a cross-linked polyethylene resin inner layer, a mica tape core layer, and a cross-linked polyethylene resin outer layer.

[0024] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various modifications and changes can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. Fire-resistant enhanced 3-core aluminum alloy cable, characterized by: The invention comprises three aluminum alloy wire cores (1) and an AFRP reinforced filling core material (2) twisted together to form a cable core, wherein the aluminum alloy wire core (1) comprises a fiber resin-based composite core (3), two to three layers of rare earth high iron aluminum alloy fan-shaped conductors (4) are twisted around the outside of the fiber resin-based composite core (3) to form an aluminum alloy conductor layer, and the outside of the aluminum alloy conductor layer is sequentially coated with a modified silicone rubber ceramic mica refractory composite tape longitudinal sheath (5), a high temperature glass fiber wire winding sheath (6) and an EPDM rubber insulation layer (7), wherein the modified silicone rubber ceramic The longitudinal sheath (5) of the modified silicone rubber ceramic mica refractory composite tape is a longitudinal overlapping wrapped structure of the modified silicone rubber ceramic mica refractory composite tape, and the overlapping rate is not less than 50%. The high-temperature glass fiber wire sheath (6) is a plurality of high-temperature glass fiber wires spirally wrapped on the outside of the longitudinal sheath (5) of the modified silicone rubber ceramic mica refractory composite tape. The winding direction of the high-temperature glass fiber wire, the winding direction of the modified silicone rubber ceramic mica refractory composite tape and the twisting direction of the cable core are all the same. The outside of the cable core is sequentially coated with a high-temperature fireproof tape wrapped fire insulation layer (8) and an EVA sheath layer (9).

2. The fire-resistant reinforced 3-core aluminum alloy cable according to claim 1 is characterized in that: The fiber resin-based composite core (3) comprises a plurality of glass fiber composite cores twisted together, wherein the glass fiber composite core comprises stainless steel monofilaments, a plurality of glass fiber core materials surround the outside of the stainless steel monofilaments and are hardened by impregnation with epoxy resin to form a composite core body, and the outside of the composite core body is coated with a PET coating layer.

3. The fire-resistant reinforced 3-core aluminum alloy cable according to claim 1 is characterized in that: The high-iron aluminum alloy fan-shaped conductor (4) is a plurality of rare earth high-iron aluminum alloy wires twisted and pressed into a fan-shaped conductor structure, and the diameter of the rare earth high-iron aluminum alloy wire is 0.1 mm to 0.3 mm.

4. The fire-resistant reinforced 3-core aluminum alloy cable according to claim 3 is characterized in that: The lay direction of the rare earth high iron aluminum alloy wire is opposite to that of the cable core.

5. The fire-resistant reinforced 3-core aluminum alloy cable according to claim 1 is characterized in that: The inner end surfaces of both ends of the longitudinal overlap of the modified silicone rubber ceramicized mica refractory composite belt are coated with a polyimide adhesive layer.

6. The fire-resistant reinforced 3-core aluminum alloy cable according to claim 1 is characterized in that: The high temperature fireproof tape wrapped fire insulation layer (8) is a high temperature fireproof tape overlapping wrapped structure with an overlapping rate of 20% to 40%. The high temperature fireproof tape is a three-layer bonded integrated structure of a cross-linked polyethylene resin inner layer, a mica tape core layer and a cross-linked polyethylene resin outer layer.

7. The fire-resistant reinforced 3-core aluminum alloy cable according to claim 1 is characterized in that: The cable core lay length is 15 to 30 times the outer diameter of the aluminum alloy wire core (1).

8. The fire-resistant enhanced 3-core aluminum alloy cable according to claim 1 is characterized in that: The AFRP reinforced filling core material (2) is composed of a plurality of aramid twisted threads twisted together, wherein the aramid twisted threads are a plurality of aramid fibers twisted together and hot-melt-bonded with thermoplastic polyurethane resin into one body.

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