CN213635496U

CN213635496U - Cross-linked polyethylene insulation low-smoke halogen-free flame-retardant fire-resistant power cable

Info

Publication number: CN213635496U
Application number: CN202120007574.7U
Authority: CN
Inventors: 孙海; 钱灵敏; 黄海平; 凌前忠; 束义如; 黄进; 黄小龙
Original assignee: Jiangxi Xinji Cable Co ltd
Current assignee: Jiangxi Xinji Cable Co ltd
Priority date: 2021-01-04
Filing date: 2021-01-04
Publication date: 2021-07-06
Anticipated expiration: 2031-01-04

Abstract

The utility model discloses a cross-linked polyethylene insulation low smoke zero halogen flame-retardant fire-resistant power cable, which belongs to the technical field of power cables, and comprises three stranded wire cores, wherein a supporting framework, an oxygen isolation layer, a flame-retardant inner sheath, a buffer layer and a flame-retardant outer sheath are sequentially arranged outside the three stranded wire cores, and a stainless steel anti-wiredrawing wire is arranged at the center of the three stranded cable; every sinle silk all includes the copper conductor, separates the inside on oxygen layer and is equipped with three buffering strip, and the cross section of buffering strip is oval structure, and the lateral wall of braced skeleton is equipped with three arc wall, and the inside packing of braced skeleton has mineral rock wool rope. The utility model discloses compressive property and fire resistance that have the preferred, through separating oxygen layer, fire-retardant inner sheath and fire-retardant oversheath, multiple fire-resistant protection is so that this cable has high fire-resistant, fire resistance, and supporting framework is used for protecting the sinle silk, avoids external force to take place to extrude and make the conductor take place to damage the cable surface.

Description

Cross-linked polyethylene insulation low-smoke halogen-free flame-retardant fire-resistant power cable

Technical Field

The utility model relates to a power cable technical field specifically says a fire-retardant fire-resistant power cable of insulating low smoke and zero halogen of crosslinked polyethylene.

Background

The power cable is used for transmitting and distributing electric energy, is commonly used for urban underground power grids, power station leading-out lines, power supply inside industrial and mining enterprises and power transmission lines under river-crossing seawater, and has a gradually increasing proportion in the power line. Power cables are cable products used in the trunk lines of power systems to transmit and distribute high power electrical energy.

Present low smoke and zero halogen fire-resistant power cable compressive property is relatively poor, leads to the cable to receive external force extrusion to take place the damage easily in the outside use, and then influences the normal use of cable to traditional low smoke and zero halogen fire-resistant power cable fire resistance is not good under the high temperature, and flame retardant property is relatively poor, needs to improve.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a fire-retardant fire-resistant power cable of cross-linked polyethylene insulation low smoke and zero halogen to solve the problem that proposes in the above-mentioned background art.

The technical scheme of the utility model is that: the cable comprises three stranded cable cores which are mutually stranded, wherein a supporting framework, an oxygen isolation layer, a flame-retardant inner sheath, a buffer layer and a flame-retardant outer sheath are sequentially arranged outside the three stranded cable cores, and a stainless steel anti-drawing wire is arranged at the center of a three-stranded cable;

each strand of wire core comprises a copper conductor, and the outside of the copper conductor is wrapped with a fire-resistant mica layer and an insulating layer in sequence;

the oxygen barrier layer is internally provided with three buffer strips which are uniformly distributed along the circumferential direction, the cross sections of the buffer strips are of an elliptical structure, the side wall of the supporting framework is provided with three arc-shaped grooves, and the three arc-shaped grooves are respectively abutted against the side walls of the three buffer strips;

mineral rock wool ropes are filled in the supporting framework;

every the inside center department of buffering strip all is equipped with the cushion chamber, and the inside fibre core that all is equipped with of both sides of buffering strip.

Further, for the compressive property of further improvement cable, the inside wall of buffer layer is equipped with a plurality of buffering spaces along circumferencial direction evenly distributed, and the lateral wall of fire-retardant inner sheath is equipped with a plurality of buffering archs along circumferencial direction evenly distributed, and a plurality of buffering spaces and a plurality of protruding one-to-one of buffering, buffering arch sets up in the buffering arch rather than corresponding.

Furthermore, the buffering protrusion is made of TPU.

Furthermore, the buffer strip is made of elastic rubber materials, and the supporting framework is made of hard rubber materials.

Furthermore, the insulating layer is made of a cross-linked polyethylene insulating material.

Furthermore, the flame-retardant outer sheath and the flame-retardant inner sheath are both made of flame-retardant polyolefin materials.

Further, the outer surface of the buffer layer is coated with a refractory coating.

The utility model discloses an improvement provides a fire-retardant fire-resistant power cable of insulating low smoke and zero halogen of crosslinked polyethylene here, compares with prior art, has following improvement and advantage:

firstly, the utility model has better compression resistance and fire resistance, and the cable has high fire resistance and fire resistance through the oxygen isolation layer, the fire-retardant inner sheath and the fire-retardant outer sheath and multiple fire-resistant protection,

the supporting framework is used for protecting the wire core, so that the phenomenon that the conductor is damaged due to the fact that external force extrudes the surface of the cable is avoided, and the buffer strip can play a further buffer effect.

Secondly, mineral rock wool ropes are filled in the supporting framework; mineral rock wool rope has the fire prevention fire-retardant, advantage that the anti tear performance is good, is favorable to carrying out fire-retardant, high temperature resistant, tensile protection to the cable core body.

And thirdly, the buffer cavity provides a certain space for the deformation of the wire core, so that the appearance of the wire core is prevented from cracking.

The buffer space is used for storing the buffer bulges, and a gap is reserved between the buffer bulges and the buffer space, so that certain space is provided for deformation of the buffer bulges, the buffer bulges can buffer the wire cores, and the compression resistance of the cable is further improved.

Drawings

The invention is further explained below with reference to the figures and examples:

FIG. 1 is a cross-sectional view of the present invention;

fig. 2 is an enlarged view of a portion a in fig. 1.

Description of reference numerals:

1. a wire core; 11. stainless steel wire drawing resistance; 12. a copper conductor; 13. a fire resistant mica layer; 14. an insulating layer; 2. a support framework; 3. an oxygen barrier layer; 4. a flame-retardant inner sheath; 5. a buffer layer; 51. a buffer space; 52. a buffer protrusion; 6. a flame retardant outer jacket; 61. a buffer strip; 62. an arc-shaped slot; 63. a buffer chamber; 64. a fiber-reinforced core; 7. mineral rock wool rope.

Detailed Description

The present invention will be described in detail with reference to fig. 1 to 2, and the technical solutions in the embodiments of the present invention will be clearly and completely described, 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.

The utility model provides a cross-linked polyethylene insulation low smoke zero halogen flame-retardant fire-resistant power cable, as shown in fig. 1-2, comprising three twisted wire cores 1, wherein a supporting framework 2, an oxygen isolation layer 3, a flame-retardant inner sheath 4, a buffer layer 5 and a flame-retardant outer sheath 6 are arranged outside the three twisted wire cores 1 in sequence, and a stainless steel anti-drawing wire 11 is arranged at the center of the three wire cable; the stainless steel anti-drawing wire 11 can improve the tensile property of the cable; the oxygen isolation layer 3 can be wrapped by high-flame-retardant glass cloth to improve the flame-retardant and fire-resistant performances of the cable, and the supporting framework 2 is used for buffering and protecting the wire core 1.

Each wire core 1 comprises a copper conductor 12, and a fire-resistant mica layer 13 and an insulating layer 14 are wrapped outside the copper conductor 12 in sequence;

three buffer strips 61 which are uniformly distributed along the circumferential direction are arranged inside the oxygen isolation layer 3, the cross section of each buffer strip 61 is of an oval structure, three arc-shaped grooves 62 are formed in the side wall of the support framework 2, and the three arc-shaped grooves 62 are respectively abutted against the side walls of the three buffer strips 61; the arc-shaped groove 62 is used for increasing the contact area between the support framework 2 and the buffer strip 61, and the buffer strip 61 is of an oval structure so as to facilitate the installation of the two fiber reinforced cores 64.

The mineral rock wool rope 7 is filled in the supporting framework 2; mineral rock wool rope 7 has the fire prevention fire-retardant, advantage that the anti tear performance is good, is favorable to carrying out fire-retardant, high temperature resistant, tensile protection to the cable core body.

The center of the inner part of each buffer strip 61 is provided with a buffer cavity 63, and the inner parts of the two sides of each buffer strip 61 are provided with a fiber reinforced core 64. The buffer cavity 63 provides a certain space for the deformation of the wire core 1, so as to avoid the appearance of the wire core 1 from cracking,

specifically, in order to further improve the compression resistance of the cable, the inner side wall of the buffer layer 5 is provided with a plurality of buffer spaces 51 uniformly distributed along the circumferential direction, the outer side wall of the flame-retardant inner sheath 4 is provided with a plurality of buffer bulges 52 uniformly distributed along the circumferential direction, the plurality of buffer spaces 51 correspond to the plurality of buffer bulges 52 one by one, and the buffer bulges 52 are arranged in the buffer bulges 52 corresponding to the buffer spaces 51; buffer space 51 is used for depositing buffering arch 52, leaves the clearance between buffering arch 52 and the buffer space 51 to for buffering arch 52 takes place to deform and provides certain space, buffering arch 52 can cushion sinle silk 1, further improves the compressive property of this cable.

Specifically, in order to further improve the buffering effect of the buffering protrusion 52, the buffering protrusion 52 is made of TPU.

Specifically, the buffer strip 61 is made of elastic rubber, and the support frame 2 is made of hard rubber. Support chassis 2 is used for protecting sinle silk 1, avoids external force to take place the extrusion and make the conductor take place to damage to the cable surface, and buffering strip 61 can play further buffering effect.

Specifically, the insulating layer 14 is made of a cross-linked polyethylene insulating material.

Specifically, the flame-retardant outer sheath 6 and the flame-retardant inner sheath 4 both adopt flame-retardant polyolefin materials. In order to further improve the flame retardant effect of the flame retardant outer sheath 6, the flame retardant outer sheath 6 is the flame retardant outer sheath 6 containing the phosphorus flame retardant, and as the phosphorus flame retardant can generate dehydration reaction at high temperature, a dense film can be formed on the surface to block air, so that a better flame retardant effect is achieved.

Specifically, to further improve the fire resistance of the cable, the outer surface of the buffer layer 5 is coated with a fire resistant coating.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a fire-retardant fire-resistant power cable of cross-linked polyethylene insulation low smoke and zero halogen which characterized in that: the cable comprises three stranded cable cores (1) which are mutually stranded, wherein a supporting framework (2), an oxygen isolation layer (3), a flame-retardant inner sheath (4), a buffer layer (5) and a flame-retardant outer sheath (6) are sequentially arranged on the outer sides of the three stranded cable cores (1), and a stainless steel anti-drawing wire (11) is arranged at the center of a three-stranded cable;

each wire core (1) comprises a copper conductor (12), and the outside of the copper conductor (12) is sequentially wrapped with a fire-resistant mica layer (13) and an insulating layer (14);

three buffer strips (61) which are uniformly distributed along the circumferential direction are arranged inside the oxygen isolation layer (3), the cross section of each buffer strip (61) is of an oval structure, three arc-shaped grooves (62) are formed in the side wall of the support framework (2), and the three arc-shaped grooves (62) are respectively abutted against the side walls of the three buffer strips (61);

mineral rock wool ropes (7) are filled in the supporting framework (2);

the inside center department of every buffering strip (61) all is equipped with cushion chamber (63), and inside the both sides of buffering strip (61) all is equipped with a fibre reinforced core (64).

2. The cross-linked polyethylene insulated low-smoke halogen-free flame-retardant fire-resistant power cable according to claim 1, characterized in that: the inside wall of buffer layer (5) is equipped with a plurality of buffering spaces (51) along circumferencial direction evenly distributed, and the lateral wall of fire-retardant inner sheath (4) is equipped with a plurality of buffering archs (52) along circumferencial direction evenly distributed, a plurality of buffering spaces (51) and a plurality of buffering arch (52) one-to-one, and buffering arch (52) set up rather than the buffering arch (52) that corresponds in.

3. The cross-linked polyethylene insulated low-smoke halogen-free flame-retardant fire-resistant power cable according to claim 2, characterized in that: the buffer bulge (52) is made of TPU material.

4. The cross-linked polyethylene insulated low-smoke halogen-free flame-retardant fire-resistant power cable according to claim 1, characterized in that: the buffer strip (61) is made of elastic rubber materials, and the supporting framework (2) is made of hard rubber materials.

5. The cross-linked polyethylene insulated low-smoke halogen-free flame-retardant fire-resistant power cable according to claim 1, characterized in that: the insulating layer (14) is made of cross-linked polyethylene insulating material.

6. The cross-linked polyethylene insulated low-smoke halogen-free flame-retardant fire-resistant power cable according to claim 1, characterized in that: the flame-retardant outer sheath (6) and the flame-retardant inner sheath (4) both adopt flame-retardant polyolefin materials.

7. The cross-linked polyethylene insulated low-smoke halogen-free flame-retardant fire-resistant power cable according to claim 1, characterized in that: the outer surface of the buffer layer (5) is coated with a refractory coating.