CN210091786U

CN210091786U - High-voltage fireproof insulated cable

Info

Publication number: CN210091786U
Application number: CN201921277693.3U
Authority: CN
Inventors: 陈晓春; 黄卓金
Original assignee: GUANGDONG TIANHONG CABLE CO Ltd
Current assignee: GUANGDONG TIANHONG CABLE CO Ltd
Priority date: 2019-08-06
Filing date: 2019-08-06
Publication date: 2020-02-18
Anticipated expiration: 2029-08-06

Abstract

The utility model provides a pair of high pressure fire prevention insulated cable, include: the cable comprises a cable core unit, a wrapping layer, a shielding layer, an inner sheath layer and an outer sheath layer, wherein the wrapping layer, the shielding layer, the inner sheath layer and the outer sheath layer are sequentially coated outside the cable core unit; the cable core unit is provided with a predetermined number of shaping bone pieces at equal intervals along the length direction of the high-voltage fireproof insulated cable, so that the three cable cores are shaped and positioned, and then the three cable cores can be supported and buffered, the whole cable is not deformed, and the design of the shaping bone pieces further ensures that the magnesium oxide fireproof insulating layer is more uniformly filled in gaps formed by the three cable cores and the wrapping layer, so that the fireproof insulating property of the high-voltage fireproof insulated cable is improved; the inner sheath adopts a copper sheath layer or an aluminum sheath layer, the fireproof performance is improved by utilizing the characteristic of high melting point of the copper sheath layer or the aluminum sheath layer, the service life is prolonged, and the outer sheath realizes the flame retardance and the protection of the inner sheath. The utility model provides a high pressure fire prevention insulated cable structural reasonable in design, fire behavior is excellent.

Description

High-voltage fireproof insulated cable

Technical Field

The utility model relates to a cable field especially relates to a high pressure fire prevention insulated cable.

Background

At present, along with the development of socioeconomic in China, the number maintainers in the power cable industry is continuously increasing, wherein high-voltage cables are widely used, most enterprises are approaching to the international level, the requirement on the production quality of the cables is continuously improved, the requirement on the cables which are exposed to sunlight in a high-temperature working environment for a long time is particularly high, and particularly the fireproof performance is high. However, the cable that uses among the existing industry, because of its structural design is unreasonable, inside cable core laminates each other, when the conflagration breaing out, the cable can not bear high temperature, cause the damage of cable core insulating layer, and then appear short circuit phenomenon between the cable core, the fire prevention insulating filler that the space department between the cable core of laminating design was filled is not enough even, lead to local area not to have fire prevention insulating filler, there is the potential safety hazard, once the conflagration takes place, the cable is cut off, will cause very big difficulty to rescue and flee for one's life.

SUMMERY OF THE UTILITY MODEL

In view of the above situation, the utility model provides a high pressure fire prevention insulated cable, inside filler is filled evenly, and fire behavior is excellent.

To achieve the object, the utility model provides a high-voltage fireproof insulated cable, include: the cable comprises a cable core unit, a wrapping layer, a shielding layer, an inner sheath layer and an outer sheath layer, wherein the wrapping layer, the shielding layer, the inner sheath layer and the outer sheath layer are sequentially coated outside the cable core unit; the cable core unit includes three at least cable core and is used for three the design bone piece of the predetermined quantity that the cable core was stereotyped, these a little design bone piece are followed high pressure fire prevention insulated cable length direction equidistant setting, its circumference of design bone piece inwards lacks respectively has with three the positioning groove of cable core adaptation, three the cable core with it has magnesium oxide fire prevention insulating layer to fill in the clearance around covering layer formation, the inner sheath layer is copper sheathing layer or aluminium sheathing layer.

Preferably, the cross section of the shaped bone piece is circular, and the center of the shaped bone piece is provided with a blanking hole, so that the magnesium oxide fireproof insulating layer can be conveniently filled.

Furthermore, the blanking hole is circular or polygonal, so that the magnesium oxide fireproof insulating layer can be filled more uniformly.

Furthermore, the thickness of the shaping bone piece is 2 mm-8 mm, so that the shaping of the cable core is facilitated.

Preferably, the cable core comprises a conductor, an XLPE insulating layer and a copper strip shielding layer from inside to outside in sequence.

Furthermore, the conductor is a single copper wire, a plurality of stranded bare copper wires or a plurality of stranded tinned copper wires.

Preferably, the outer sheath layer is a flame-retardant PVC protective layer for protecting the inner sheath from oxidation or corrosion and simultaneously playing a flame-retardant role.

Preferably, a rat-proof protective layer is further arranged outside the outer protective sleeve layer and used for preventing the cables which are not exposed after being laid from being bitten by rats and damaged.

The utility model has the advantages that:

the utility model provides a pair of high pressure fire prevention insulated cable, include: the cable comprises a cable core unit, a wrapping layer, a shielding layer, an inner sheath layer and an outer sheath layer, wherein the wrapping layer, the shielding layer, the inner sheath layer and the outer sheath layer are sequentially coated outside the cable core unit; the cable core unit is provided with a predetermined number of shaping bone pieces at equal intervals along the length direction of the high-voltage fireproof insulated cable, the shaping bone pieces are used for shaping and positioning the three cable cores, and further can support and buffer the three cable cores when the cable is pressed, so that the whole cable is not deformed, and the design of the shaping bone pieces further ensures that the magnesium oxide fireproof insulating layer can be more uniformly filled in gaps formed by the three cable cores and the wrapping layer, so that the fireproof insulating property of the magnesium oxide fireproof insulating layer is improved; and simultaneously, the inner sheath adopts copper sheathing layer or aluminium restrictive coating to utilize the high characteristics of its melting point to improve fire behavior, improves the life of cable, and its outer sheath has adopted fire-retardant PVC protective layer, realizes fire-retardant and protective effect, and the one-level is prevented fires promptly, can protect the inner sheath layer simultaneously not by oxidation or corruption in special environment, the utility model provides a high pressure fire prevention insulated cable is structural reasonable in design, and fire behavior is excellent.

Drawings

Fig. 1 is a first cross-sectional view of a high-voltage fireproof insulated cable according to an embodiment of the present invention;

fig. 2 is a second cross-sectional view of a high-voltage fireproof insulated cable according to an embodiment of the present invention;

fig. 3 is a cross-sectional view of a second type of shaped bone fragment provided by an embodiment of the present invention.

In the figure: 1-outer sheath layer, 2-inner sheath layer, 3-shielding layer, 4-wrapping layer, 5-shaped bone piece, 6-magnesium oxide fireproof insulating layer, 7-cable core, 8-rat-proof protective layer, 51-blanking hole, 71-conductor, 72-XLPE insulating layer and 73-copper strip shielding layer.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings and embodiments.

Examples

Referring to fig. 1 and fig. 2, it should be noted that fig. 1 is a cross-sectional view of a place where the shaped bone pieces 5 are located, and fig. 2 is a cross-sectional view between two shaped bone pieces 5, in this embodiment, a high-voltage fireproof insulated cable includes: the cable comprises a cable core unit, a wrapping layer 4, a shielding layer 3 woven by copper wires, an inner sheath layer 2 and an outer sheath layer 1, wherein the wrapping layer, the shielding layer 3 woven by the copper wires, the inner sheath layer and the outer sheath layer are sequentially coated outside the cable core unit; the cable core unit comprises three cable cores 7 and a preset number of shaping bone pieces 5 for shaping the three cable cores 7, the shaping bone pieces 5 are arranged at equal intervals along the length direction of the high-voltage fireproof insulated cable, the designed value of the interval is 10-150 cm in the embodiment, positioning grooves matched with the three cable cores 7 are respectively inwards recessed in the circumferential direction of the shaping bone pieces 5, the positioning grooves are uniformly distributed in the circumferential direction of the shaping bone pieces 5, gaps formed by the three cable cores 7 and the wrapping layer 4 are filled with a magnesium oxide fireproof insulating layer 6, and the inner sheath layer 2 is a copper sheath layer or an aluminum sheath layer; the lapping layer 4 is formed by lapping a plurality of layers of fire-resistant mica tapes; the cross section of the shaped rib piece 5 is circular, a blanking hole 51 is formed in the center of the shaped rib piece, so that the magnesium oxide fireproof insulation layer 6 can be conveniently filled, specifically referring to fig. 1 and 3, the shape of the blanking hole 51 is circular or polygonal, multiple shapes listed in the embodiment are circular and hexagonal, but not limited to the circular and hexagonal shapes, so that the magnesium oxide fireproof insulation layer 6 can be conveniently and uniformly filled, and further, the thickness of the shaped rib piece 5 for facilitating the shaping of the three cable cores 7 in the embodiment is designed to be 2 mm-8 mm; in this embodiment, three cable cores 7 are illustrated, but it is not limited to four or six cable cores, and the shaped bone pieces 5 are always fitted.

Further, the cable core 7 sequentially includes, from inside to outside, a conductor 71, an XLPE insulating layer 72(XLPE is an abbreviation of crosslinked polyethylene english name), and a copper tape shielding layer 73, wherein the conductor 71 is one of a single copper wire, a plurality of stranded bare copper wires, or a plurality of stranded tinned copper wires.

Further, the outer sheath layer 1 is a flame retardant PVC protective layer for protecting the inner sheath from oxidation or corrosion and for providing a flame retardant function. In order to prevent the cables which are not exposed after being laid from being damaged due to the gnawing of mice, in this embodiment, a ratproof protective layer 8 is further arranged outside the outer sheath layer 1.

The shaping bone pieces 5 in the high-voltage fireproof insulated cable provided in the embodiment are used for shaping and positioning the three cable cores 7, so that the three cable cores 7 can be supported and buffered when the cable is pressed, the whole cable is prevented from deforming, and the magnesium oxide fireproof insulating layer 6 can be uniformly filled in gaps formed by the three cable cores 7 and the wrapping layer 4 through the design of the shaping bone pieces 5, so that the fireproof insulating performance of the high-voltage fireproof insulated cable is improved; simultaneously, the inner sheath adopts copper sheathing layer or aluminium restrictive coating to utilize the high characteristics of its melting point to improve fire behavior, improves the life of cable, and its outer sheath has adopted fire-retardant PVC protective layer, realizes fire-retardant and protective effect, and the one-level is prevented fires promptly, can protect inner sheath layer 2 not oxidized or corruption in special environment simultaneously, and the high pressure fire prevention insulated cable that this embodiment provided structural reasonable in design, fire behavior is excellent.

The above description is only for the specific embodiments of the present invention, but it should be understood by those skilled in the art that the present invention is only by way of example, and the scope of the present invention is defined by the appended claims. Therefore, the equivalent changes made in the claims of the present invention still belong to the scope covered by the present invention.

Claims

1. A high-voltage fireproof insulated cable, comprising: the cable comprises a cable core unit, a wrapping layer, a shielding layer, an inner sheath layer and an outer sheath layer, wherein the wrapping layer, the shielding layer, the inner sheath layer and the outer sheath layer are sequentially coated outside the cable core unit; the cable core unit includes three at least cable core and is used for three the design bone piece of the predetermined quantity that the cable core was stereotyped, these a little design bone piece are followed high pressure fire prevention insulated cable length direction equidistant setting, its circumference of design bone piece inwards lacks respectively has with three the positioning groove of cable core adaptation, three the cable core with it has magnesium oxide fire prevention insulating layer to fill in the clearance around covering layer formation, the inner sheath layer is copper sheathing layer or aluminium sheathing layer.

2. The high-voltage fireproof insulated cable according to claim 1, wherein the shaped rib has a circular cross section and a central blanking hole.

3. The high-voltage fireproof insulated cable according to claim 2, wherein the blanking hole is circular or polygonal in shape.

4. The high-voltage fireproof insulated cable according to any one of claims 1 to 3, wherein the thickness of the shaped bone pieces is 2mm to 8 mm.

5. The high-voltage fireproof insulated cable according to claim 1, wherein the cable core comprises a conductor, an XLPE insulating layer and a copper tape shielding layer in sequence from inside to outside.

6. The high voltage, fire-resistant, insulated cable according to claim 5, wherein the conductor is a single copper wire, a plurality of stranded bare copper wires, or a plurality of stranded tinned copper wires.

7. The high-voltage fire-resistant insulated cable according to claim 1, wherein the outer sheath layer is a flame-retardant PVC protective layer.

8. The high-voltage fireproof insulated cable according to claim 1, wherein a rat-proof sheath is further provided outside the outer sheath.