CN216849360U - Cross-linked polyethylene insulated low-smoke halogen-free fire-resistant power cable - Google Patents

Abstract

The utility model discloses an insulating low smoke and zero halogen fire-resistant power cable of crosslinked polyethylene, including the cable core, the cable core comprises five insulated wire, every insulated wire is by the copper conductor, constitute around the insulating layer of package flame retardant coating and the coaxial crowded package outside the flame retardant coating outside the copper conductor, the inside hollow department of cable core and the outside equal cladding of cable core have the stopping, the embedded spacing core strip that is equipped with a plurality of root subsides and covers in the cable core outer wall of stopping, the stopping has the stranding band around the package outward, the outer crowded package of stranding band has the protection core cover, the coaxial crowded package in proper order of protection core cover outer wall from interior to exterior has the anti-tear layer, the flame retardant coating, low smoke and zero halogen flame retardant polyolefin sheath. The utility model discloses all easily wet, the sinle silk breaks away from the scheduling problem and improves easily appearing under the vibration of rigid cable high strength to fire resisting cable inner insulating layer among the prior art, the utility model discloses still possess insulating difficult advantage such as breaking away from of sinle silk emergence of still avoiding inside under damping, the high strength vibration when having rigidity and flexible fire resisting cable advantage.

Description

Cross-linked polyethylene insulated low-smoke halogen-free fire-resistant power cable

Technical Field

The utility model relates to the technical field of cables, especially, relate to a fire-resistant power cable of insulating low smoke and zero halogen of crosslinked polyethylene.

Background

The fire-resistant electric wire and cable refers to a cable which can maintain the normal operation for a certain time under the condition that external flame is still burnt in the event of a fire accident of the electric wire and cable, maintain the integrity of the electric wire and cable circuit and maintain the normal operation of circuit equipment.

The fire-resistant electric wire and cable can be divided into two grades according to the national standard: class a and class B. Generally denoted as NHA-like and NHB-like. Whether a wire and cable product belongs to a fire-resistant wire and cable is judged, and the judgment is irrelevant to whether the wire and cable product has self-extinguishing property. The greatest function of the flame-retardant electric wire and cable is the flame retardancy of the electric wire and cable product itself. The fire-resistant electric wire and cable can normally keep normal operation for at least 3 hours at the flame temperature of 750-800 ℃.

There is also a special type of fire resistant cable known as fire resistant wire cable. It is made up by using seamless copper pipe as protective cover and using magnesium oxide as insulating material. Due to the particularity of the material, the fireproof electric wire and cable can not burn or delay burning. Experiments show that: the fireproof electric wire and cable still normally operate at 800-900 ℃ for 2 hours, and still continuously normally operate within 30 minutes at 1000 ℃.

Fire-resistant cable among the prior art still has some insufficiencies, and fire-resistant cable on the existing market mainly has rigidity and flexible two kinds, and its main difference is: the cable is rigid, and is a copper core copper sheath mineral insulated cable taking magnesium oxide as insulation, and the flexible copper core rolled copper sheath fireproof cable taking a mica tape as insulation; the insulation of the cables with the two structures is easy to be affected with damp; and because the intensity of rigidity fire resisting cable is higher, and is great to the protection intensity of sinle silk, under the regional environment of part high vibration, its rigidity fire resisting cable leads to inside sinle silk to take place to break away from easily under the vibration of high strength to under the bending state of great length, flexible fire resisting cable leads to the sinle silk to take place the rupture problem.

To above technical problem, the utility model discloses an insulating low smoke and zero halogen fire-resistant power cable of crosslinked polyethylene, the utility model discloses still possess insulating difficult damp, high strength vibration down still can avoid inside sinle silk to take place to break away from, advantage such as sinle silk difficult rupture under the crooked attitude of great length when having rigidity, flexible fire-resistant cable advantage.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a fire-resistant power cable of cross-linked polyethylene insulation low smoke and zero halogen to solve among the prior art fire-resistant cable inner insulating layer and all easily wet, the problem that the easy rupture of sinle silk takes place to break away from the condition, flexible cable under the crooked state of great length appears easily in inside sinle silk under the vibration of rigid cable high strength. The utility model discloses still possess insulating difficult damp, high strength vibration under still can avoid inside sinle silk to take place to break away from, advantage such as sinle silk is difficult for breaking under the crooked attitude of great length when having rigidity, flexible fire resisting cable advantage.

The utility model discloses a following technical scheme realizes: the utility model discloses an insulating low smoke and zero halogen fire-resistant power cable of crosslinked polyethylene, including the cable core, the cable core comprises five insulated wire, every insulated wire is by the copper conductor, constitute around the insulating layer of package flame retardant coating and the coaxial crowded package outside the flame retardant coating outside the copper conductor, the inside hollow department of cable core and the outside equal cladding of cable core have the stopping, the embedded spacing core strip that is equipped with a plurality of root subsides and covers in the cable core outer wall of stopping, the stopping has the stranding band around the package outward, the outer crowded package of stranding band has the protection core cover, the coaxial crowded package in proper order of protection core cover outer wall from interior to exterior has the anti-tear layer, the flame retardant coating, low smoke and zero halogen flame retardant polyolefin sheath.

Furthermore, in order to make the cable body light in weight, good in heat resistance, strong in load capacity and high in mechanical strength, the insulating layer is made of a cross-linked polyethylene material.

Furthermore, in order to enable the conductor to have a better moisture-proof effect, the fire-resistant layer is a mica tape, the filler is a dust-free rock wool rope, and the cabling wrapping tape is a low-smoke halogen-free tape.

Furthermore, in order to avoid direct transmission of pressure to the internal conductor, the protective core sleeve consists of a protective layer and pressure-resistant buffer blocks fixed on the inner wall of the protective layer at equal intervals, and the cross sections of the pressure-resistant buffer blocks are of an A-shaped structure.

Furthermore, for being better, spacing core strip equidistance is located between the adjacent insulated wire, and the inside wall of spacing core strip is hugged closely with two corresponding insulated wire outer walls respectively.

The utility model has the advantages of it is following:

(1) the utility model uses the mica tape to wrap the outer wall of the copper conductor in the cable conductor, and then extrudes the insulating layer made of the cross-linked polyethylene material outside the mica tape, thereby effectively solving the problem that the conductor insulating layer in the existing rigid and flexible cable structure has no damp-proof effect;

(2) the utility model discloses extrude outside the stranding band and wrap up the protection core cover that is used for antagonizing outside high strength vibration, protection core cover is fixed the withstand voltage buffer block that is in the inoxidizing coating inner wall by inoxidizing coating and equidistance and constitutes, because of withstand voltage buffer block is "A" font structure, when meetting external shock or high strength vibration, the withstand voltage buffer block bottom that receives pressure separates to both sides in order to bear outside pressure, the central point of withstand voltage buffer block is close to with the stranding band skin simultaneously, after pressure disappears, withstand voltage buffer block resumes to initial condition, get rid of pressure, this structure can avoid pressure to transmit directly to the internal guide wire;

(3) the utility model discloses be equipped with the subsides at the wire outer wall and cover spacing core strip at its surface, spacing core strip sets up between two adjacent insulated wire, can confirm the distribution position of wire, avoid under the bending condition of great length, flexible fireproof cable leads to the sinle silk to take place the rupture problem, the inside sinle silk of still avoiding appearing under outside high strength vibration breaks away from the problem, spacing core strip outside is still crowded package has the stopping, the stopping outside is around having the stranding band, the stopping, the stranding band can be confirmed to the position of spacing core strip, make the inside limit structure of cable conductor stable.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic structural view of the limiting core strip of the present invention;

fig. 3 is a schematic view of the local enlarged structure of the protective core sleeve of the present invention.

In the figure: 1. a cable core; 2. an insulated wire; 201. a copper conductor; 202. a refractory layer; 203. an insulating layer; 3. a filler; 4. cabling belt; 5. a low-smoke halogen-free flame-retardant polyolefin sheath; 6. a protective core sleeve; 601. a protective layer; 602. a pressure-resistant buffer block; 7. limiting the core strip; 8. a tear resistant layer; 9. and a fire-proof layer.

Detailed Description

The following embodiments of the present invention are described in detail, and the present embodiment is implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the following embodiments, and in the description of the present invention, words like "front", "back", "left", "right", etc. indicating directions or position relations are only for convenience of description of the present invention and simplifying the description, but do not indicate or imply that the indicated device or element must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.

The utility model provides a technical scheme: the utility model provides an insulating low smoke and zero halogen fire-resistant power cable of crosslinked polyethylene, as shown in fig. 1 and 2, including cable core 1, cable core 1 comprises five insulated conductor 2, every insulated conductor 2 by copper conductor 201, constitute around package flame retardant coating 202 outside copper conductor 201 and the outer coaxial crowded insulating layer 203 of package of flame retardant coating 202, the inside hollow department of cable core 1 and the cable core 1 outside equal cladding of cable core have a filler 3, filler 3 embeds is equipped with the spacing core strip 7 of a plurality of subsides in cable core 1 outer wall, filler 3 is wrapped outward and is had cabled belting 4, cabled belting 4 is crowded outward and is wrapped has protective core cover 6, protective core cover 6 outer wall from interior to exterior is coaxial crowded package in proper order has anti-tear layer 8, flame retardant coating 9, low smoke and zero halogen fire-retardant polyolefin sheath 5.

As shown in fig. 1, the insulating layer 203 is made of cross-linked polyethylene material, so that the cable body has light weight, good heat resistance, strong load capacity, no melting, chemical corrosion resistance and high mechanical strength.

As shown in fig. 1 and 2, the fire-resistant layer 202 is a mica tape, the filler 3 is a dust-free rock wool rope, and the cabling tape 4 is a low-smoke halogen-free tape, so that the conductors are separated by the fire-resistant layer 202, and the cable has good fire-proof and insulating properties.

As shown in fig. 1 and 3, the protective core sleeve 6 is composed of a protective layer 601 and a pressure-proof buffer block 602 fixed on the inner wall of the protective layer 601 at equal intervals, the cross section of the pressure-proof buffer block 602 is of an "a" -shaped structure, the pressure-proof buffer block 602 of the "a" -shaped structure can disperse the resisting pressure at two points when receiving pressure, and when the pressure disappears, the pressure returns to the initial state to avoid the pressure being directly transmitted to the internal conductor.

As shown in fig. 1 and 2, spacing core bar 7 equidistance is located between adjacent insulated conductor 2, and the inside wall of spacing core bar 7 is hugged closely with two corresponding insulated conductor 2 outer walls respectively, can carry out spacingly to the distribution of wire, makes the cable have the effect of antitorque pressure simultaneously.

The principle of the utility model is as follows: the outer wall of each wire is provided with a limiting core strip 7 attached to the surface of each wire, the limiting core strips 7 are arranged between two adjacent insulated wires 2, the distribution positions of the wires can be determined, the problem that the wire cores are broken due to flexible fireproof cables in a bending state with large length is avoided, the problem that the inner wire cores are separated from each other under external high-strength vibration is also avoided, the filler 3 is further extruded and wrapped outside the limiting core strips 7, the cabling wrapping belt 4 is wrapped outside the filler 3, and the filler 3 and the cabling wrapping belt 4 can determine the positions of the limiting core strips 7, so that the internal limiting structure of the cable is stable; the outer side of the cabling belting 4 is extruded with a protective core sleeve 6 for resisting external high-strength vibration, the protective core sleeve 6 consists of a protective layer 601 and pressure-resistant buffer blocks 602 which are equidistantly fixed on the inner wall of the protective layer 601, and because the pressure-resistant buffer blocks 602 are in an A-shaped structure, when external impact or high-strength vibration is met, the bottoms of the pressure-resistant buffer blocks 602 are separated towards two sides to bear external pressure, meanwhile, the central points of the pressure-resistant buffer blocks 602 are adjacent to the outer layer of the cabling belting 4, and after the pressure disappears, the pressure-resistant buffer blocks 602 recover to the initial state to remove the pressure, so that the structure can prevent the pressure from being directly transmitted to an internal lead; the mica tape is wrapped on the outer wall of the copper conductor 201 in the cable, and the insulating layer 203 made of the cross-linked polyethylene material is extruded outside the mica tape, so that the problem that the conductor insulation in the existing rigid and flexible cable structure does not have a moisture-proof effect is effectively solved.

Claims (5)

1. The utility model provides an insulating low smoke and zero halogen fire-resistant power cable of crosslinked polyethylene, a serial communication port, including the cable core, the cable core comprises five insulated wire, every insulated wire by the copper conductor, constitute around package flame retardant coating outside the copper conductor and the insulating layer of the coaxial crowded package of flame retardant coating outward, the inside hollow department of cable core and the outside equal cladding of cable core have the stopping, the embedded spacing core strip that is equipped with a plurality of roots cladding in the cable core outer wall that is equipped with of stopping, the stopping has the stranding band around the package outward, the outer crowded package of stranding band has the protection core cover, protection core cover outer wall from interior to exterior is coaxial crowded package in proper order has anti-tear layer, flame retardant coating, low smoke and zero halogen flame retardant polyolefin sheath.

2. The cross-linked polyethylene insulated low smoke zero halogen fire resistant power cable of claim 1 wherein said insulation layer is made of cross-linked polyethylene material.

3. The cross-linked polyethylene insulated low-smoke halogen-free fire-resistant power cable as claimed in claim 1, wherein the fire-resistant layer is a mica tape, the filler is a dust-free rock wool rope, and the cabling tape is a low-smoke halogen-free tape.

4. The cross-linked polyethylene insulated low-smoke halogen-free fire-resistant power cable as claimed in claim 1, wherein the protective core sheath is composed of a protective layer and a voltage-proof buffer block fixed on the inner wall of the protective layer at equal intervals, and the cross section of the voltage-proof buffer block is in an "A" shape structure.

5. The cross-linked polyethylene insulated low-smoke halogen-free fire-resistant power cable as claimed in claim 1, wherein the limiting core strips are equidistantly arranged between the adjacent insulated wires, and the inner side walls of the limiting core strips are respectively tightly attached to the outer walls of the two corresponding insulated wires.

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