CN210073353U - Crosslinked polyethylene insulation halogen-free low-smoke flame-retardant cable - Google Patents

Abstract

The utility model discloses a crosslinked polyethylene insulation halogen-free low-smoke flame-retardant cable in the technical field of crosslinked polyethylene insulation halogen-free low-smoke flame-retardant cable, a conductor shielding layer is extruded on the outer wall of a stranded copper conductor, a crosslinked polyethylene insulating layer is extruded on the outer wall of the conductor shielding layer, a strippable insulating shielding layer is extruded on the outer wall of the crosslinked polyethylene insulating layer, a copper strip shielding layer and three groups of copper strip shielding layers are fixed on the outer wall of the strippable insulating shielding layer, a flame-retardant wrapping tape is fixedly arranged on the outer side of the copper strip shielding layer, PP filling strips are filled between the flame-retardant wrapping tape and the copper strip shielding layer, an isolation sleeve is extruded on the outer wall of the flame-retardant wrapping tape, a steel strip armor is fixed on the outer wall of the isolation sleeve, a flame-retardant polyolefin sheath is extruded on the outer wall of the steel strip armor, the structure is compact, the conductivity, the current-carrying capacity is strong, and the safety is high.

Description

Crosslinked polyethylene insulation halogen-free low-smoke flame-retardant cable

Technical Field

The utility model relates to a low cigarette flame retarded cable technical field is not had in crosslinked polyethylene insulation, specifically is a low cigarette flame retarded cable is not had in crosslinked polyethylene insulation.

Background

With the rapid development of national economy and the continuous improvement of the living standard of people, the electricity consumption of the society is greatly increased, various electrical equipment is increased suddenly, and in an electrical fire, the fire caused by wires and cables occupies more than half of the fire, so that the requirements on flame retardance and fire resistance of the C-type wires and cables are higher and higher.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an insulating no halogen low smoke flame retarded cable of crosslinked polyethylene to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the cross-linked polyethylene insulated halogen-free low-smoke flame-retardant cable comprises three groups of twisted copper conductors with the same structure, wherein a conductor shielding layer is fixedly extruded on the outer wall of each twisted copper conductor, a cross-linked polyethylene insulating layer is extruded on the outer wall of the conductor shielding layer, a strippable insulating shielding layer is extruded on the outer wall of the cross-linked polyethylene insulating layer, a copper strip shielding layer is fixed on the outer wall of the strippable insulating shielding layer, the three groups of the copper strip shielding layers are fixedly provided with flame-retardant wrapping tapes on the outer sides of the copper strip shielding layers, PP filling strips are filled between the flame-retardant wrapping tapes and the copper strip shielding layers, isolating sleeves are extruded on the outer walls of the flame-retardant wrapping tapes, steel strip armoring is fixed on the outer walls of the isolating sleeves, and flame-retardant polyolefin sheaths are extruded on the outer walls.

Preferably, the flame-retardant wrapping tape is made by extruding and filling halogen-free flame-retardant elastomer filler.

Preferably, the PP filling strips are PP filling ropes, the PP filling ropes are arranged along the length direction of the cable, and reinforcing ribs are nested in the PP filling ropes.

Preferably, the electrical resistivity of the conductor shield layer is less than Ω · m, the strippable insulation shield layer is a semiconductive layer, and the electrical resistivity is not more than 500 Ω · m.

Preferably, the outer wall of the flame-retardant polyolefin sheath is sprayed with a wear-resistant layer.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model has the advantages of reasonable design, can improve insulating fire-retardant fire behavior greatly through fire-retardant polyolefin sheath, can guarantee through the crosslinked polyethylene insulating layer that the transposition copper conductor has good insulating electrical property, can prevent again that the electric current from leaking, reduce the loss, can make electric field evenly distributed through conductor shield and strippable insulation shield, can homogenization electric field through the copper strips shielding layer, ground protection can also be done, can realize keeping apart copper strips and steel band through the separation sleeve, prevent the steel band oxidation, fire-retardant compactness that can increase the cable around the band, improve tensile strength simultaneously, can increase the intensity and the mechanical properties of cable through the steel band armor.

Drawings

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

In the figure: the cable comprises a flame-retardant polyolefin jacket 1, a steel belt armor 2, an isolation sleeve 3, a flame-retardant wrapping belt 4, a PP (polypropylene) filling strip 5, a copper belt shielding layer 6, a strippable insulating shielding layer 7, a crosslinked polyethylene insulating layer 8, a conductor shielding layer 9 and a stranded copper conductor 10.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, the present invention provides a technical solution: the utility model provides a cross-linked polyethylene insulation does not have steamed low cigarette flame retarded cable, including the same transposition copper conductor 10 of three group structures, fixed crowded package has conductor shielding layer 9 on the outer wall of transposition copper conductor 10, the crowded package of outer wall of conductor shielding layer 9 has cross-linked polyethylene insulating layer 8, crowded package has strippable insulating shield 7 on the outer wall of cross-linked polyethylene insulating layer 8, be fixed with copper strips shielding layer 6 on the outer wall of strippable insulating shield 7, the fixed fire-retardant tape 4 that winds that is provided with in the outside of three group copper strips shielding layer 6, it has PP packing strip 5 to fill between fire-retardant tape 4 and the copper strips shielding layer 6, fixed crowded package has uide bushing 3 on the outer wall of fire-retardant tape 4, be fixed with steel strip armor 2 on the outer wall of uide bushing 3, fixed crowded package has fire-retardant polyolefin sheath 1 on the outer wall of steel strip.

The flame-retardant wrapping tape 4 is made of halogen-free flame-retardant elastomer fillers through extrusion filling, so that the tightness of the cable can be improved, and the flame-retardant capability of the cable can be improved;

the cross-linked polyethylene insulating layer 8 can ensure that the stranded copper conductor 10 has good insulating electrical performance, prevent current leakage and reduce loss;

the PP filling strips 5 are PP filling ropes which are arranged along the length direction of the cable, and the reinforcing ribs are embedded in the PP filling ropes, so that the tensile strength of the cable can be improved;

the resistivity of the conductor shielding layer 9 is less than 1000 ohm-m, the strippable insulation shielding layer 7 is a semi-conducting layer, and the resistivity is not more than 500 ohm-m;

unevenness's decorative pattern has evenly been seted up on the surface of fire-retardant polyolefin sheath 1, and the spraying has the wearing layer on the outer wall of fire-retardant polyolefin sheath 1, can improve the wearability of fire-retardant polyolefin sheath 1 through this kind of setting.

Example (b): the device is when using, can improve the fire-retardant fire resistance of insulation of cable greatly through fire-retardant polyolefin sheath 1, can increase the intensity and the mechanical properties of cable through steel tape armor 2, can realize keeping apart copper strips and steel band through separation sleeve 3, prevent the steel band oxidation, fire-retardant compactness that can increase the cable around band 4, improve the tensile strength simultaneously, PP packing strip 5 can play fire-retardant packing and the rounding degree that increases the cable, can the homogenization electric field through copper strips shielding layer 6, can also do ground protection, can guarantee through crosslinked polyethylene insulating layer 8 that stranded copper conductor 10 has good insulating electrical property, can prevent again that the electric current from leaking, reduce the loss, can make electric field evenly distributed through conductor shielding layer 9 and strippable insulating layer 7, the cable preparation process flow is: firstly selecting an oxygen-free copper rod with the purity of more than 99.97 percent, so that the electric conductivity of the cable can be ensured, then drawing the copper rod, softening the copper rod after drawing, compressing and twisting the softened copper rod to generate a twisted copper conductor 10, wherein the conductor shielding layer 9, the strippable insulation shielding layer 7 and the crosslinked polyethylene insulation layer 8 are all manufactured by adopting a three-layer co-extrusion full-closed chemical crosslinking process, the conductor shielding layer 9 is arranged on the outer wall of the twisted copper conductor 10, then carrying out metal shielding on the outer wall of the strippable insulation shielding layer 7, namely, the copper strip shielding layer 6 is tightly attached to the outer wall of the strippable insulation shielding layer 7, then filling the PP filling strips 5 into the cable, extruding and wrapping the flame-retardant tape 4, then extruding and wrapping the isolation sleeve 3, then armoring the steel strip, and finally carrying out outer sheath extrusion and wrapping to form the flame-retardant polyolefin sheath 1, thus completing the.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (6)

1. The utility model provides a low cigarette flame retarded cable of insulating nothing of crosslinked polyethylene which characterized in that: comprises three groups of stranded copper conductors (10) with the same structure, a conductor shielding layer (9) is fixedly extruded on the outer wall of each stranded copper conductor (10), the outer wall of the conductor shielding layer (9) is extruded and wrapped with a crosslinked polyethylene insulating layer (8), the outer wall of the crosslinked polyethylene insulating layer (8) is extruded and wrapped with a strippable insulating shielding layer (7), the outer wall of the strippable insulation shielding layer (7) is fixed with a copper strip shielding layer (6), the outer sides of the three groups of copper strip shielding layers (6) are fixedly provided with flame-retardant wrapping tapes (4), PP filling strips (5) are filled between the flame-retardant wrapping tape (4) and the copper tape shielding layer (6), an isolation sleeve (3) is fixedly extruded on the outer wall of the flame-retardant wrapping tape (4), the outer wall of the isolation sleeve (3) is fixedly provided with a steel strip armor (2), and the outer wall of the steel strip armor (2) is fixedly extruded with a flame-retardant polyolefin jacket (1).

2. The cross-linked polyethylene insulated halogen-free low-smoke flame-retardant cable according to claim 1, characterized in that: the flame-retardant wrapping tape (4) is made by extruding, wrapping and filling halogen-free flame-retardant elastomer fillers.

3. The cross-linked polyethylene insulated halogen-free low-smoke flame-retardant cable according to claim 1, characterized in that: the crosslinked polyethylene insulating layer (8) is an extruded halogen-free low-smoke flame-retardant crosslinked polyethylene insulating layer.

4. The cross-linked polyethylene insulated halogen-free low-smoke flame-retardant cable according to claim 1, characterized in that: the PP filling strips (5) are PP filling ropes which are arranged along the length direction of the cable, and reinforcing ribs are embedded in the PP filling ropes.

5. The cross-linked polyethylene insulated halogen-free low-smoke flame-retardant cable according to claim 1, characterized in that: the resistivity of the conductor shielding layer (9) is less than 1000 omega-m, the strippable insulation shielding layer (7) is a semi-conducting layer, and the resistivity is not more than 500 omega-m.

6. The cross-linked polyethylene insulated halogen-free low-smoke flame-retardant cable according to claim 1, characterized in that: the outer wall of the flame-retardant polyolefin sheath (1) is sprayed with a wear-resistant layer.

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