Fire-resistant low-smoke halogen-free flame-retardant power cable

Abstract

The invention discloses a fireproof steel wire armored low-voltage halogen-free flame-retardant power cable which comprises a cable, a first low-smoke halogen-free flame-retardant wrapping tape layer, a low-smoke halogen-free flame-retardant inner sheath, a steel wire armored layer, a second low-smoke halogen-free flame-retardant wrapping tape layer and a low-voltage halogen-free flame-retardant outer sheath. The first low-smoke halogen-free flame-retardant wrapping tape layer is wrapped on the outer circumferential surface of the cable, the low-voltage halogen-free flame-retardant inner sheath is extruded on the outer circumferential surface of the first low-smoke halogen-free flame-retardant wrapping tape layer, and the steel wire armor layer is wrapped on the outer circumferential surface of the low-voltage halogen-free flame-retardant inner sheath. The second low-smoke halogen-free flame-retardant wrapping tape layer is wrapped on the outer peripheral surface of the steel wire armor layer; and the low-voltage halogen-free flame-retardant outer sheath is extruded on the outer peripheral surface of the second low-smoke halogen-free flame-retardant wrapping tape layer. The cable has excellent fire resistance and low-smoke halogen-free characteristics, the fire resistance can reach 950 DEG C * 180min, and the cable can be directly buried and laid and is suitable for occasions requiring high safety standards.

Description

Technical Field

[0001] The present invention relates to the technical field of power cables, and in particular to a fire-resistant, low-smoke, halogen-free, flame-retardant power cable. Background Art

[0002] Power cable is a cable used to transmit electricity, mainly used in industries, construction, agriculture, transportation and other fields. They usually have a thicker wire diameter, thicker phase insulation, and are protected by metal armor on the outside. Power cables are used in power supply systems as the main line of three-phase industrial electricity or single-phase civil power supply. They can withstand large currents and voltages to ensure the stability and safety of power transmission. The design of this type of cable takes into account specific needs in industrial applications, such as fire resistance, flame retardancy, chemical resistance, etc., to adapt to various harsh environments and challenges. However, the existing power cables are still not ideal in terms of fire resistance, flame retardancy, and chemical resistance.

[0003] Therefore, the applicant has found a solution to the above-mentioned problem through beneficial exploration and research, and the technical solution to be introduced below is produced in this context. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a fire-resistant, low-smoke, halogen-free flame-retardant power cable with improved fire resistance, flame retardancy and chemical resistance in view of the deficiencies in the prior art.

[0005] The technical problem to be solved by the present invention can be achieved by adopting the following technical solutions:

[0006] A fire-resistant steel wire armored low-voltage halogen-free flame-retardant power cable, comprising a cable line, a first low-smoke halogen-free flame-retardant tape layer, a low-smoke halogen-free flame-retardant inner sheath, a steel wire armor layer, a second low-smoke halogen-free flame-retardant tape layer and a low-voltage halogen-free flame-retardant outer sheath; the cable line is formed by twisting a plurality of core wires, each core wire comprising a plurality of stranded soft copper wire conductors, a mica tape layer wrapped around the outer circumference of the plurality of stranded soft copper wire conductors, and a low-smoke halogen-free flame-retardant outer sheath extruded on the outer circumference of the mica tape layer. Flame-retardant insulation layer; the first low-smoke halogen-free flame-retardant tape layer is wrapped around the outer circumference of the cable wire, the low-voltage halogen-free flame-retardant inner sheath is extruded on the outer circumference of the first low-smoke halogen-free flame-retardant tape layer, the steel wire armor layer is wrapped around the outer circumference of the low-voltage halogen-free flame-retardant inner sheath, the second low-smoke halogen-free flame-retardant tape layer is wrapped around the outer circumference of the steel wire armor layer, and the low-voltage halogen-free flame-retardant outer sheath is extruded on the outer circumference of the second low-smoke halogen-free flame-retardant tape layer.

[0007] In a preferred embodiment of the present invention, among the plurality of twisted core wires, one of the core wires is a ground core wire.

[0008] In a preferred embodiment of the present invention, the low-smoke halogen-free flame-retardant insulation layer is a cross-linked polyethylene insulation layer.

[0009] In a preferred embodiment of the present invention, the first low-smoke halogen-free flame retardant tape layer is a polyolefin tape.

[0010] In a preferred embodiment of the present invention, the low-smoke halogen-free flame-retardant inner sheath is made of thermoplastic polyurethane or thermoplastic polyolefin.

[0011] In a preferred embodiment of the present invention, the steel wire armor layer is an armor layer made of low-carbon steel wire, high-carbon steel wire, alloy steel wire and stainless steel wire.

[0012] In a preferred embodiment of the present invention, the second low-smoke halogen-free flame retardant tape layer is a polyolefin tape.

[0013] In a preferred embodiment of the present invention, the low-pressure halogen-free flame-retardant outer sheath is made of thermoplastic polyurethane or thermoplastic polyolefin.

[0014] Due to the adoption of the above technical scheme, the beneficial effect of the present invention is that the power cable of the present invention includes a cable line, a first low-smoke halogen-free flame-retardant tape layer, a low-smoke halogen-free flame-retardant inner sheath, a steel wire armor layer, a second low-smoke halogen-free flame-retardant tape layer and a low-voltage halogen-free flame-retardant outer sheath from the inside to the outside. Each core wire in the cable line adopts a multi-strand twisted soft copper wire conductor and is coated with a mica tape and a low-smoke halogen-free flame-retardant insulation layer. The mica tape adopts a high-temperature resistant material, the low-smoke halogen-free flame-retardant insulation layer is made of environmentally friendly materials, the steel wire armor layer provides mechanical protection, and the low-smoke halogen-free flame-retardant inner sheath and the low-smoke halogen-free flame-retardant outer sheath have excellent chemical corrosion resistance and low-smoke halogen-free characteristics. The power cable of the present invention can maintain structural integrity under high temperature conditions, reduce the generation of smoke and toxic gases during fire, and ensure personnel safety and equipment operation. The present invention has excellent fire resistance and low-smoke halogen-free characteristics, and the fire resistance reaches 950℃*180min. It can be directly buried and is suitable for occasions requiring high safety standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic cross-sectional view of the present invention. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0018] See also Figure 1 The figure shows a fire-resistant steel wire armored low-voltage halogen-free flame-retardant power cable, including a cable line 100, a first low-smoke halogen-free flame-retardant tape layer 200, a low-smoke halogen-free flame-retardant inner sheath 300, a steel wire armor layer 400, a second low-smoke halogen-free flame-retardant tape layer 500 and a low-voltage halogen-free flame-retardant outer sheath 600.

[0019] The cable 100 is formed by twisting a plurality of core wires 110, among which one core wire is a ground core wire. Each core wire 110 includes a plurality of stranded soft copper wire conductors 111, a mica tape layer 112, and a low-smoke halogen-free flame-retardant insulating layer 113. The mica tape layer 112 is wrapped around the outer circumference of the plurality of stranded soft copper wire conductors 111, and the low-smoke halogen-free flame-retardant insulating layer 113 is extruded on the outer circumference of the mica tape layer 112. In this embodiment, the low-smoke halogen-free flame-retardant insulating layer 113 preferably adopts a cross-linked polyethylene (XLPE) insulating layer.

[0020] The first low-smoke zero-halogen flame-retardant tape layer 200 is wrapped around the outer circumference of the cable. In this embodiment, the first low-smoke zero-halogen flame-retardant tape layer 200 is preferably made of polyolefin tape.

[0021] The low-smoke halogen-free flame-retardant inner sheath 300 is extruded on the outer peripheral surface of the first low-smoke halogen-free flame-retardant tape layer 200. In this embodiment, the low-smoke halogen-free flame-retardant inner sheath 300 is preferably made of thermoplastic polyurethane (TPU) or thermoplastic polyolefin (TPO), which has excellent chemical corrosion resistance and low-smoke halogen-free characteristics.

[0022] The steel wire armor layer 400 is wrapped around the outer circumference of the low-smoke halogen-free flame-retardant inner sheath 300. In the embodiment, the steel wire armor layer 400 is preferably made of low-carbon steel wire, high-carbon steel wire, alloy steel wire and stainless steel wire to provide stable mechanical protection.

[0023] The second low-smoke zero-halogen flame-retardant tape layer 500 is wrapped around the outer circumference of the steel wire armor layer 400. In this embodiment, the second low-smoke zero-halogen flame-retardant tape layer 500 is preferably made of polyolefin tape.

[0024] The low-pressure halogen-free flame-retardant outer sheath 600 is extruded on the outer peripheral surface of the second low-smoke halogen-free flame-retardant tape layer 500. In this embodiment, the low-pressure halogen-free flame-retardant outer sheath 600 is preferably made of thermoplastic polyurethane (TPU) or thermoplastic polyolefin (TPO), which has excellent chemical corrosion resistance and low-smoke halogen-free characteristics.

[0025] The present invention has excellent fire resistance and low smoke and halogen-free characteristics, the fire resistance reaches 950°C*180min, can be directly buried, and is suitable for occasions requiring high safety standards.

[0026] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A fire-resistant steel wire armored low-voltage halogen-free flame-retardant power cable, characterized in that: It comprises a cable, a first low-smoke halogen-free flame-retardant tape layer, a low-smoke halogen-free flame-retardant inner sheath, a steel wire armor layer, a second low-smoke halogen-free flame-retardant tape layer and a low-voltage halogen-free flame-retardant outer sheath; the cable is formed by twisting a plurality of core wires, each core wire comprising a plurality of strands of twisted soft copper wire conductors, a mica tape layer wrapped on the outer circumference of the plurality of strands of twisted soft copper wire conductors and a low-smoke halogen-free flame-retardant insulation layer extruded on the outer circumference of the mica tape layer; the first low-smoke halogen-free flame-retardant tape layer is wrapped on the outer circumference of the cable, the low-voltage halogen-free flame-retardant inner sheath is extruded on the outer circumference of the first low-smoke halogen-free flame-retardant tape layer, the steel wire armor layer is wrapped on the outer circumference of the low-voltage halogen-free flame-retardant inner sheath, the second low-smoke halogen-free flame-retardant tape layer is wrapped on the outer circumference of the steel wire armor layer, and the low-voltage halogen-free flame-retardant outer sheath is extruded on the outer circumference of the second low-smoke halogen-free flame-retardant tape layer.

2. The fire-resistant steel wire armored low-voltage halogen-free flame-retardant power cable according to claim 1, characterized in that: Among the multiple twisted core wires, one of the core wires is a ground core wire.

3. The fire-resistant steel wire armored low-voltage halogen-free flame-retardant power cable according to claim 1, characterized in that: The low-smoke halogen-free flame-retardant insulation layer is a cross-linked polyethylene insulation layer.

4. The fire-resistant steel wire armored low-voltage halogen-free flame-retardant power cable according to claim 1, characterized in that: The first low-smoke halogen-free flame-retardant tape layer is a polyolefin tape.

5. The fire-resistant steel wire armored low-voltage halogen-free flame-retardant power cable according to claim 1, characterized in that: The low-smoke halogen-free flame-retardant inner sheath is made of thermoplastic polyurethane or thermoplastic polyolefin.

6. The fire-resistant steel wire armored low-voltage halogen-free flame-retardant power cable according to claim 1, characterized in that The steel wire armor layer is made of low carbon steel wire, high carbon steel wire, alloy steel wire and stainless steel wire.

7. The fire-resistant steel wire armored low-voltage halogen-free flame-retardant power cable according to claim 1, characterized in that: The second low-smoke halogen-free flame-retardant tape layer is a polyolefin tape.

8. The fire-resistant steel wire armored low-voltage halogen-free flame-retardant power cable according to claim 1, characterized in that: The low-pressure halogen-free flame-retardant outer sheath is made of thermoplastic polyurethane or thermoplastic polyolefin.

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