CN215577886U - High-insulation flame-retardant power cable - Google Patents

Abstract

The utility model discloses a high-insulation flame-retardant power cable which comprises a cable core and a protective layer covering the outer side of the cable core, wherein the cable core comprises a plurality of cable cores, and a shielding layer, an insulating layer and an insulating shielding layer are sequentially arranged on the outer side of each cable core from inside to outside. In the scheme, a method of winding copper wire bundles and overlapping copper strips is adopted in the cable protection layer, and the insulating shielding material of the cable is made of a polypropylene material, so that the temperature resistance and the shielding effect of the cable can be improved; gas harmful to the environment and personnel is not generated in the cable production process, the production speed is high, and the efficiency is high; the insulating material can be directly recycled, and the resource waste is reduced.

Description

High-insulation flame-retardant power cable

Technical Field

The utility model relates to a cable, in particular to a high-insulation flame-retardant power cable.

Background

The existing power cable is insulated by crosslinked polyethylene, and the traditional crosslinked polyethylene insulated power cable has poor temperature resistance, current-carrying capacity and conveying capacity compared with polypropylene insulating materials. Harmful gas can be generated in the cross-linked polyethylene processing process, the cross-linked energy consumption is high, insulation is difficult to recycle when a cable is replaced, the environment is polluted, the shielding effect is poor, and insulation aging, discharging and even breakdown can be accelerated; and secondly, the flame retardant effect of the common variable frequency cable is poor, or a fire disaster happens under the condition of high-density valuable equipment, so that serious property loss is caused. For example, chinese patent publication No. CN102157244A, published as 2011, 8/17/entitled "water-blocking power cable," includes three sets of wire cores, each set of wire core is composed of a conductor, a rubber layer and an insulating layer, the rubber layer is coated outside the conductor, the insulating layer is wrapped outside the coated rubber layer, the water-blocking inner wrapping layer is wrapped outside the three sets of wire cores and the filling layer, and the polyethylene inner liner, the copper tape shielding layer, the outer wrapping layer, the aluminum-poly bonding sheath and the outer sheath are sequentially disposed outside the water-blocking inner wrapping layer from inside to outside. The disadvantages of the prior patents are: the protective layer and the core insulating layer of the cable are made of polyethylene insulating materials, so that the high-temperature resistant effect and the shielding effect are poor, harmful gas is easily generated in the processing process, and the harmful gas is difficult to recycle; the protective layer of the cable has poor flame retardant effect.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the problems that an insulating shielding material is poor in high-temperature resistance effect and shielding effect, and the material is easy to generate harmful gas and difficult to recycle, and provides a high-insulation flame-retardant power cable which is improved in high-temperature resistance effect and shielding effect and can be recycled.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a fire-retardant power cable of high insulation, includes cable core and the protective layer that covers in the cable core outside, the cable core includes a plurality of sinle silks, and every sinle silk outside from interior to exterior is equipped with shielding layer, insulating layer and insulation shield in proper order, the protective layer includes inner sheath layer and oversheath layer, from interior to exterior is equipped with the copper strand around shielding layer, copper strips overlapping around the covering between inner sheath layer and the oversheath layer in proper order, the copper strips overlaps around the covering outside around package glass fiber tape.

The cable core is cabled, and after the inner sheath is extruded, the copper wire bundle is adopted to wind the shield and the copper belt is adopted to overlap the wrapping, so that the shielding and flame-retardant effects of the cable are increased, and meanwhile, the capacity of bearing short-circuit current by the metal shield can also be increased. The copper wire is wound in a bundle mode on the outer side of the outer sheath, the copper strip is wound in a lap mode on the outer side of the copper wire bundle winding shielding layer, the shielding effect is improved, and the copper strip is wound in a lap mode to better fix the copper wire bundle winding shielding layer. The glass fiber belt has played fire-retardant effect, and when the oversheath layer was impaired, the glass fiber belt can play fire-retardant effect, prevents under the high temperature condition that the intraformational copper silk bundle of protection from overlapping around the shielding layer and copper strips and damaging around the covering, and prevents that the copper silk bundle from overlapping around shielding layer and copper strips and causing the damage to the oversheath layer around the covering.

Preferably, the wire core further comprises a metal shielding layer arranged outside the insulation shielding layer. The metal shield adopts a copper wire bundle winding mode, so that the shielding effect is improved, and the capacity of bearing short-circuit current of the metal shield is increased. The insulating shield outside of every sinle silk is equipped with the metallic shield layer, and when the protective layer in the cable core outside was impaired, when the copper filament bundle was overlapped around shielding layer and copper strips and can't play the shielding effect around the covering, this metallic shield layer can protect the sinle silk, the guarantee was to the last shielding effect of cable.

Preferably, a semi-conductive buffering water-blocking tape layer is wound between the metal shielding layer and the insulating shielding layer. The insulating shielding layer outside has the semiconduction buffering band layer that blocks water of one deck 2.0mm around the package, plays and blocks water, buffering and shielding effect, and non-corrosiveness constitutes for the insulating sinle silk of protection prevents that the metallic shield layer from causing the damage to insulating layer and insulating shielding layer under the high temperature condition.

Preferably, the wire cores are uniformly distributed along the circumferential direction of the axis of the cable.

Preferably, the insulating layer is a polypropylene insulating layer. The polypropylene material can improve the high temperature resistance of the cable, increase the capacity of the cable, reduce energy consumption and improve productivity. The polypropylene material is more environment-friendly, so that the cable can be recycled, gas harmful to the environment and personnel can not be generated in the production process, the production speed is high, and the efficiency is high.

Preferably, the inner sheath is a halogen-free low-smoke flame-retardant polyolefin oxygen-insulating layer sheath, and a glass fiber tape is wrapped outside the halogen-free low-smoke flame-retardant polyolefin oxygen-insulating layer sheath. The inner sheath plays fire-retardant effect, and the glass fiber area has high temperature resistant, insulating effect, has improved fire-retardant effect, prevents under the high temperature condition that, prevents that the copper filament bundle from causing the damage around the covering around shielding layer and copper strips overlapping. And the halogen-free, low-smoke and environment-friendly material is adopted, and the material is nontoxic after combustion.

Preferably, the outer sheath is an environment-friendly high-flame-retardant B1-grade halogen-free low-smoke flame-retardant polyolefin sheath. The outer sheath plays a flame retardant role and is made of halogen-free, low-smoke and environment-friendly materials, and has no toxicity after combustion.

Preferably, a filling layer is arranged in a gap between the inner sheath and the cable core, the filling layer is filled with mineral paper wires, and glass fiber tapes are wrapped outside the mineral paper wires in a wrapping mode. Mineral paper wires are used for filling during three-core cabling, the fireproof and heat insulation effects are achieved, the glass fiber belt achieves the flame retardant effect, the mineral paper wires can be fixed by the glass fiber belt for filling, and the safety of the cable is improved.

The utility model has the beneficial effects that: (1) the temperature resistance and the shielding effect of the cable are improved; (2) gas harmful to the environment and personnel is not generated in the cable production process, the production speed is high, and the efficiency is high; (3) the insulating material can be directly recycled, and the resource waste is reduced.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present invention.

In the figure: the cable comprises a cable core 1, a shielding layer 2, an insulating layer 3, an insulating shielding layer 4, an inner sheath layer 5, an outer sheath layer 6, a copper wire bundle winding shielding layer 7, a copper strip overlapping winding layer 8, a metal shielding layer 9, a semi-conductive buffering water-blocking belt layer 10 and a filling layer 11.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the present invention is further described with reference to the accompanying drawings and the detailed description.

In the embodiment shown in fig. 1, a high-insulation flame-retardant power cable comprises a cable core and a protective layer covering the outside of the cable core, wherein the cable core comprises a plurality of cable cores 1, a shielding layer 2, an insulating layer 3 and an insulating shielding layer 4 are sequentially arranged on the outside of each cable core 1 from inside to outside, the protective layer comprises an inner sheath layer 5 and an outer sheath layer, a copper wire bundle is sequentially arranged between the inner sheath layer 5 and the outer sheath layer from inside to outside around the shielding layer 7, a copper strip is overlapped around the covering layer 8, and a glass fiber strip is wrapped around the outside of the covering layer 8 by the copper strip.

The cable core 1 is cabled, and after the inner sheath is extruded, the copper wire bundle is adopted to wind the shielding and the copper belt is adopted to overlap the wrapping, so that the shielding and flame-retardant effects of the cable are increased, and meanwhile, the capacity of bearing short-circuit current by the metal shielding can also be increased. The copper wires are wound outside the outer sheath in a bundled mode, the copper strips are wound outside the copper wire bundle winding shielding layer 7 in an overlapped mode, the shielding effect is improved, and the copper strips are wound in an overlapped mode to better fix the copper wire bundle winding shielding layer 7. The glass fiber belt has played fire-retardant effect, and when the oversheath layer was impaired, the glass fiber belt can play fire-retardant effect, prevents under the high temperature condition that the intraformational copper silk bundle of protection from overlapping around shielding layer 7 and copper strips and damaging around covering 8, and prevents that the copper silk bundle from overlapping around shielding layer 7 and copper strips and causing the damage to the oversheath layer around covering 8.

According to the high-insulation flame-retardant power cable shown in the embodiment, the copper wire bundle is wound and the copper strips are stacked in the cable protection layer, the polypropylene material is used as the insulating and shielding material of the cable, the problems that the protection layer of the cable and the insulation layer 3 of the wire core 1 are made of the polyethylene insulating material, the high-temperature resistant effect and the shielding effect are poor, harmful gas is easily generated in the machining process, and the recycling and the poor flame-retardant effect of the protection layer of the cable are difficult are solved. Glass fiber belts are wound on the inner side and the outer side of the copper wire bundle winding shielding layer 7 and the copper belt overlapping winding layer 8, the inner sheath layer 5 and the outer sheath layer can be protected from being damaged by metal shielding, and the safety of the cable is improved.

Further, the wire core 1 further comprises a metal shielding layer 9 arranged outside the insulation shielding layer 4. The metal shield adopts a copper wire bundle winding mode, so that the shielding effect is improved, and the capacity of bearing short-circuit current of the metal shield is increased. Every sinle silk 1's the insulating shield layer 4 outside is equipped with metal shielding layer 9, and when the protective layer in the cable core outside was impaired, when the copper filament bundle wound shielding layer 7 and copper strips overlap around covering 8 and can't play the shielding effect, this metal shielding layer 9 can protect sinle silk 1, the guarantee was to the last shielding effect of cable.

Further, a semi-conductive buffering water-blocking tape layer 10 is wound between the metal shielding layer 9 and the insulating shielding layer 4. The semi-conductive buffering water-blocking tape layer 10 with the thickness of 2.0mm is wound on the outer side of the insulating shielding layer 4, water-blocking, buffering and shielding effects are achieved, and the insulating shielding layer is noncorrosive and used for protecting the insulating wire core 1 and preventing the insulating layer 3 and the insulating shielding layer 4 from being damaged by the metal shielding layer 9 under the high-temperature condition.

Further, the wire cores 1 are uniformly distributed along the circumferential direction of the axis of the cable.

Further, the insulating layer 3 is a polypropylene insulating layer 3. The polypropylene material can improve the high temperature resistance of the cable, increase the capacity of the cable, reduce energy consumption and improve productivity. The polypropylene material is more environment-friendly, so that the cable can be recycled, gas harmful to the environment and personnel can not be generated in the production process, the production speed is high, and the efficiency is high.

Furthermore, the inner sheath adopts a halogen-free low-smoke flame-retardant polyolefin oxygen-insulating layer sheath, and a glass fiber tape is wrapped outside the halogen-free low-smoke flame-retardant polyolefin oxygen-insulating layer sheath. The inner sheath plays fire-retardant effect, and the glass fiber area has high temperature resistant, insulating effect, has improved fire-retardant effect, prevents under the high temperature condition that, prevents that the copper filament bundle from causing the damage around covering 8 around shielding layer 7 and copper strips overlapping to inner sheath layer 5. And the halogen-free, low-smoke and environment-friendly material is adopted, and the material is nontoxic after combustion.

Furthermore, the outer sheath adopts an environment-friendly high-flame-retardant B1-grade halogen-free low-smoke flame-retardant polyolefin sheath. The outer sheath plays a flame retardant role and is made of halogen-free, low-smoke and environment-friendly materials, and has no toxicity after combustion.

Further, be equipped with filling layer 11 in the space between inner sheath and sinle silk 1, filling layer 11 adopts mineral paper line to fill, and the outside is packed around the glass fiber area to mineral paper line packing. Mineral paper wires are used for filling during three-core cabling, the fireproof and heat insulation effects are achieved, the glass fiber belt achieves the flame-retardant effect, the mineral paper wires can be fixed by the glass fiber belt for filling, and the safety of the cable is improved.

The above embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereby. All equivalent changes in the shape and structure of the present invention are also intended to be included within the scope of the present invention.

Claims (8)

1. The utility model provides a high-insulation flame-retardant power cable, includes cable core and the protective layer that covers in the cable core outside, the cable core includes a plurality of sinle silks (1), and every sinle silk outside from interior to exterior is equipped with shielding layer (2), insulating layer (3) and insulation shielding layer (4) in proper order, its characterized in that, the protective layer includes inner sheath layer (5) and oversheath layer (6), from interior to exterior is equipped with the copper silk bundle around shielding layer (7), copper strips overlapping around covering (8) between inner sheath layer and the oversheath layer in proper order, the copper strips overlaps around the covering outside around covering glass fiber tape.

2. A highly insulated flame retardant power cable according to claim 1, characterized in that the core further comprises a metallic shielding layer (9) arranged outside the insulating shielding layer.

3. A highly insulating flame retardant power cable according to claim 2 wherein a semi-conductive buffer water blocking tape layer (10) is wrapped between the metallic and insulating shielding layers.

4. A highly insulated flame retardant power cable according to claim 1 or 2 wherein the cores are evenly distributed circumferentially around the cable core.

5. The high-insulation flame-retardant power cable according to claim 1, wherein the insulation layer is a polypropylene insulation layer.

6. The high-insulation flame-retardant power cable according to claim 1, wherein the inner sheath is a halogen-free low-smoke flame-retardant polyolefin oxygen-insulating layer sheath, and a glass fiber tape is wrapped outside the halogen-free low-smoke flame-retardant polyolefin oxygen-insulating layer sheath.

7. The high-insulation flame-retardant power cable according to claim 1, wherein the outer sheath is an environment-friendly high-flame-retardant B1-grade halogen-free low-smoke flame-retardant polyolefin sheath.

8. The high-insulation flame-retardant power cable according to claim 1 or 6, wherein a filling layer (11) is arranged in a gap between the inner sheath and the wire core, the filling layer is filled with mineral paper wires, and the mineral paper wires are filled with an outer wrapping glass fiber tape.

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