High-strength fireproof cable

Abstract

The utility model discloses a high-strength fire-resistant cable, which relates to the technical field of wires and cables, and comprises a conductor layer, a fire-resistant layer, a pressure-resistant layer and a sheath layer, the conductor layer comprises a plurality of groups of leads formed by twisting high-purity annealed copper wires, and nickel is plated on the surfaces of the copper wires. The fireproof layer comprises an insulating layer and a high-temperature-resistant layer which are sequentially arranged on the outer side of the conductor layer, the sheath layer comprises an inner sheath, a braid layer and an outer sheath which are sequentially arranged on the outer side of the compression-resistant layer, the insulating layer and the high-temperature-resistant layer form a progressive fireproof barrier, the sheath layer loads stress in a partial mode, single-point failure is avoided, meanwhile, outdoor aging can be dealt with, and the service life of the cable is prolonged. The cable service life is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric wire and cable, specifically is a kind of high-strength fire-resistant cable. BACKGROUND

[0002] Cable is usually by several or several groups of wire (at least two in each group) stranded cable similar to rope, each group of wire is insulated from each other, and is twisted around a center, the whole outside is covered with highly insulated covering layer.Cable has the characteristics of internal power supply and external insulation.Cable industry is closely related to various departments of national economy.Wire and cable is also known as the "arteries" and "nerves" of the national economy, is to transport electric energy, transmit information and manufacture various electric machines, instruments, instruments, realize electromagnetic energy conversion indispensable basic equipment, is the necessary basic product in future electrification, information-based society.High-strength fire-resistant cable is a kind of special cable that can maintain circuit integrity and functionality under high temperature and extreme environment, and is widely used in fire-fighting system, emergency lighting, nuclear power plant, high-rise building, subway, tunnel and other places with high safety requirements.

[0003] For example, the Chinese patent document with publication number CN215265676U discloses a high-strength fire-resistant special cable, which includes a wire, an insulating layer wrapped outside the wire, a filler filled in the insulating layer, a first sealing layer wrapped outside the filler, a hollow support frame arranged outside the first sealing layer, a second sealing layer wrapped outside the support frame, and a metal mesh arranged outside the second sealing layer;However, the existing technology still has some shortcomings, such as: the overall strength of the cable needs to be further improved, and only the fire-retardant material filled in the support frame reacts when heated to form a glass-like covering layer on the support frame, which achieves internal oxygen isolation, and the fire resistance is poor. UTILITY MODEL CONTENT

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art, provide a high-strength fire-resistant cable, the insulating layer and the high-temperature-resistant layer form a progressive fireproof barrier, the sheath layer shares stress, avoids single-point failure, and can also cope with outdoor aging, improves the service life of the cable.

[0005] In order to solve the above technical problems, the technical scheme of the utility model is: a high-strength fire-resistant cable, comprising a conductor layer, a fire-resistant layer, a compression-resistant layer and a sheath layer, the conductor layer comprises a plurality of groups of wires twisted by high-purity annealed copper wires, and the copper wires are plated with nickel on the surface, the fire-resistant layer comprises an insulating layer and a high-temperature-resistant layer arranged outside the conductor layer in sequence, and the sheath layer comprises an inner sheath, a braided layer and an outer sheath arranged outside the compression-resistant layer in sequence.

[0006] Further, the conductor layer further comprises a non-woven fabric layer wrapped outside the wire.

[0007] Further, the insulating layer is wrapped by synthetic mica tape.

[0008] Further, the high-temperature-resistant layer is extruded by silicone rubber, and ceramic filler is added in the silicone rubber.

[0009] Further, the compression-resistant layer is woven by ceramic fiber rope.

[0010] Further, the inner sheath is a stainless steel wire braided armor layer.

[0011] Further, the braided layer is an aramid fiber braided net.

[0012] Further, the outer sheath is extruded by modified fluororubber.

[0013] Further, the outer wall of the outer sheath is designed as corrugated grooves.

[0014] The above technical scheme is adopted, and the utility model has the following beneficial effects:

[0015] 1. The synthetic mica tape of the insulating layer plays a role of physical isolation, the ceramicized silicone rubber of the high-temperature-resistant layer is chemically converted to form a hard ceramic layer at high temperature, and the insulating layer and the high-temperature-resistant layer form a progressive fireproof barrier;

[0016] 2. The stainless steel wire braided armor of the inner sheath and the aramid fiber of the braided layer share stress, avoiding single-point failure;

[0017] 3. The fluororubber outer sheath can cope with outdoor aging, and the groove design improves heat dissipation and bending life. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structural schematic view of the high-strength fire-resistant cable of the utility model.

[0019] Reference signs: 1, conductor layer; 2, fire-resistant layer; 3, compression-resistant layer; 4, sheath layer;

[0020] 11, wire; 12, non-woven fabric layer; 21, insulating layer; 22, high-temperature-resistant layer;

[0021] 41, inner sheath; 42, braided layer; 43, outer sheath; 44, groove. DETAILED DESCRIPTION

[0022] In order to make the content of the utility model more easily and clearly understood, the utility model is further described in detail below according to specific embodiments and in combination with the drawings.

[0023] In the embodiment, a high-strength fire-resistant cable is provided, which comprises a conductor layer 1, a fire-resistant layer 2, a compression-resistant layer 3 and a sheath layer 4, the conductor layer 1 comprises a plurality of groups of conductive wires 11 twisted by high-purity annealed copper wires, and the copper wires are plated with nickel, the fire-resistant layer 2 comprises an insulation layer 21 and a high-temperature-resistant layer 22 arranged outside the conductor layer 1 in sequence, and the sheath layer 4 comprises an inner sheath 41, a braided layer 42 and an outer sheath 43 arranged outside the compression-resistant layer 3 in sequence.

[0024] In the embodiment, the conductive wires 11 are designed by twisting a plurality of copper wires, which can balance the conductivity and bending fatigue resistance, and the high melting point of copper can make the conductive wires 11 have good high-temperature resistance. At the same time, the flexibility of the copper wires is enhanced after annealing, and the oxidation resistance can be improved by plating the surface of the copper wires with nickel, which is suitable for corrosive environments.

[0025] In the embodiment, the conductor layer 1 further comprises a non-woven fabric layer 12 wrapped outside the conductive wires 11, which can avoid damage caused by friction between adjacent conductive wires 11, and can also provide certain electromagnetic shielding function to reduce the influence of external electromagnetic interference on cable signal transmission.

[0026] In the embodiment, the insulation layer 21 is wrapped by synthetic mica tape, and in the scheme, the synthetic mica tape is glass fiber reinforced mica tape, which has a temperature resistance of 1000℃ or above and forms an insulation framework at high temperature to prevent conductor short circuiting due to melting.

[0027] In the embodiment, the high-temperature-resistant layer 22 is extruded by silicone rubber, and ceramic fillers are added to the silicone rubber. The silicone rubber is relatively flexible at room temperature, and is sintered into a hard ceramic layer at high temperature, which together with the insulation layer 21 provides double insulation protection for the internal conductive wires 11.

[0028] In the embodiment, the compression-resistant layer 3 is woven by ceramic fiber rope, which plays a role in improving the strength of the cable, and at the same time, the ceramic fiber rope has the advantages of good high-temperature resistance and acid and alkali corrosion resistance, which makes the compression-resistant layer 3 can buffer mechanical impact and isolate oxygen to inhibit combustion.

[0029] In the embodiment, the inner sheath 41 is a stainless steel wire braided armor layer, which has the advantages of tensile, compression and cutting resistance, and can also serve as an electromagnetic shielding layer; the braided layer 42 is a aramid fiber braided net, which has high tensile strength, making the braided layer 42 a lightweight tensile component that can effectively share the mechanical stress of the cable; the outer sheath 43 is extruded by modified fluororubber, which has a temperature resistance of -50℃ to 250℃, and also has the characteristics of oil resistance, acid and alkali resistance, and ultraviolet resistance. At the same time, the outer wall of the outer sheath 43 is designed with corrugated grooves 44 to enhance flexibility and heat dissipation capacity.

[0030] The high-strength fireproof cable has the advantages that the synthetic mica tape of the insulating layer 21 plays a role of physical isolation, the ceramicized silica gel of the high-temperature resistant layer 22 is chemically converted to form a hard ceramic layer under high temperature, and the insulating layer 21 and the high-temperature resistant layer 22 form a progressive fireproof barrier; the stainless steel wire braided armor of the inner sheath 41 and the aramid fiber of the braided layer 42 share stress, avoiding single-point failure; and the fluororubber outer sheath 43 can cope with outdoor aging, and the groove 44 is designed to improve heat dissipation and bending life.

[0031] The above-described specific embodiments further specifically describe the technical problems solved by the utility model, technical solutions and beneficial effects, and it should be understood that the above-described specific embodiments are merely specific embodiments of the utility model and are not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A high strength fire resistant cable, characterized by: It comprises a conductor layer (1), a fireproof layer (2), a pressure-resistant layer (3) and a sheath layer (4), the conductor layer (1) comprises a plurality of groups of conductive wires (11) twisted by high-purity annealed copper wires, and the copper wires are plated with nickel, the fireproof layer (2) comprises an insulating layer (21) and a high-temperature-resistant layer (22) arranged outside the conductor layer (1) in sequence, and the sheath layer (4) comprises an inner sheath (41), a braided layer (42) and an outer sheath (43) arranged outside the pressure-resistant layer (3) in sequence.

2. A high strength fire resistant cable according to claim 1, characterized in that: The conductor layer (1) further comprises a non-woven fabric layer (12) wrapped outside the conductive wires (11).

3. A high strength fire resistant cable according to claim 1, characterized in that: The insulating layer (21) is wrapped by a synthetic mica tape.

4. A high strength fire resistant cable according to claim 1, characterized in that: The high-temperature-resistant layer (22) is extruded by silicone rubber, and ceramic fillers are added in the silicone rubber.

5. A high strength fire resistant cable according to claim 1, characterized in that: The pressure-resistant layer (3) is woven by ceramic fiber ropes.

6. A high strength fire resistant cable according to claim 1, characterized in that: The inner sheath (41) is a stainless steel wire braided armor layer.

7. A high strength fire resistant cable according to claim 1, characterized in that: The braided layer (42) is an aramid fiber braided net.

8. A high strength fire resistant cable according to claim 1, characterized in that: The outer sheath (43) is extruded by modified fluororubber.

9. A high strength fire resistant cable according to claim 8, characterised in that: The outer wall of the outer sheath (43) is designed as corrugated grooves (44).

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