CN220121532U

CN220121532U - Medium-voltage fire-resistant aluminum alloy power cable

Info

Publication number: CN220121532U
Application number: CN202321653547.2U
Authority: CN
Inventors: 程乾; 吴常振; 熊世文
Original assignee: Sichuan Mingda Wire And Cable Technology Co ltd
Current assignee: Sichuan Mingda Wire And Cable Technology Co ltd
Priority date: 2023-06-27
Filing date: 2023-06-27
Publication date: 2023-12-01
Anticipated expiration: 2033-06-27

Abstract

The utility model discloses a medium-voltage fire-resistant aluminum alloy power cable, which relates to the field of fire-resistant cables and comprises a plurality of wire cores and a wrapping layer arranged on the outer sides of the wire cores, wherein each wire core comprises an aluminum alloy conductor, a conductor shielding layer, an insulating shielding layer and a metal shielding layer are wrapped on one side of the outer side of each aluminum alloy conductor from inside to outside, each wrapping layer comprises a wrapping layer, a fire-resistant layer and a sheath layer from inside to outside, and a filling layer is arranged in a gap between each wrapping layer and each metal shielding layer; the wrapping layer is made of non-woven fabric strip material. The medium-voltage refractory aluminum alloy power cable has the advantages that the refractory layer is not easy to damage at high temperature and has good refractory performance.

Description

Medium-voltage fire-resistant aluminum alloy power cable

Technical Field

The utility model relates to the field of fire-resistant cables, in particular to a medium-voltage fire-resistant aluminum alloy power cable.

Background

The fire-resistant wire cable is a cable which can be used for keeping normal operation for a certain time under the condition that external flame is still burnt in a wire cable fire accident; at present, part of aluminum alloy medium voltage fire-resistant cables are used for reducing combustion flue gas, halogen-containing gas is not released, a low smoke zero halogen belt is adopted for wrapping the cables, however, low smoke zero halogen raw materials are high in price, long in production period, and good in flame retardant property of the low smoke zero halogen belt, the low smoke zero halogen belt has a fire isolating effect, insulating substances of the cables can not be directly contacted with flames to be burnt, but are heated and melted, and due to the fastening effect of the low smoke zero halogen belt, stress deformation generated by melting of the insulating substances can not be released outwards, so that a fire-resistant layer bears larger extrusion impact force, and for part of armored cables, the stress deformation generated by an armored steel belt is applied to the fire-resistant layer when the temperature changes, the fire-resistant layer is greatly damaged, so that the fire resistance of the cables is influenced.

Disclosure of Invention

Aiming at the problems, the utility model provides a medium-voltage fireproof aluminum alloy power cable which has the advantages that a fireproof layer is not easy to damage at high temperature and has good fireproof performance.

The technical scheme of the utility model is as follows:

the medium-voltage fire-resistant aluminum alloy power cable comprises a plurality of wire cores and a wrapping layer arranged on the outer sides of the wire cores, wherein each wire core comprises an aluminum alloy conductor, the outer sides of the aluminum alloy conductors are sequentially wrapped with a conductor shielding layer, an insulating shielding layer and a metal shielding layer from inside to outside, each wrapping layer is sequentially provided with a wrapping layer, a fire-resistant layer and a sheath layer from inside to outside, and a filling layer is arranged in a gap between each wrapping layer and each metal shielding layer; the wrapping layer is made of non-woven fabric strips.

In a further technical scheme, the conductor shielding layer, the insulating layer and the insulating shielding layer are formed into three-layer coextrusion by adopting a dry crosslinking method.

In a further technical scheme, the metal shielding layer is of a copper strip wrapping structure.

In a further technical scheme, the filling layer is ceramic fiber cotton.

In a further technical scheme, the refractory layer is ceramic silicon rubber.

In a further technical scheme, the sheath layer comprises an inner sheath and an outer sheath, and a fireproof mud layer is arranged between the inner sheath and the outer sheath.

In a further technical scheme, the outer side of the inner sheath is provided with reinforcing ribs.

In a further technical scheme, the reinforcing ribs are arranged at intervals along the length direction of the inner sheath.

The beneficial effects of the utility model are as follows:

1. the wrapping layer of the cable adopts a non-woven fabric belt wrapping structure, the wrapping is tight, and a plurality of wire cores are sequentially wrapped from inside to outside by adopting the wrapping layer, the fire-resistant layer and the sheath layer, so that the structure is compact; when the cable is burnt, the cable and the insulating material are burnt together, so that the stress deformation generated by temperature fluctuation has enough space to be outwards diffused and released, the extrusion damage to the fire-resistant layer is reduced, an armored cable structure is adopted, the failure rate is low, and the influence on the fire resistance of the cable is small;

2. the copper strip wrapped metal shielding layer is adopted, so that the protection effect on peripheral elements of the cable is good, and the use is safer;

3. the fireproof layer of ceramic silicon rubber is adopted, the residue after combustion is a hard ceramic shell, and the fireproof performance is strong;

4. the double-layer sheath is provided, the cable is not easy to be damaged due to the influence of external force, the fireproof mud layer is arranged between the sheaths, and the fire resistance of the cable is further improved.

Drawings

Fig. 1 is a schematic structural view of a medium voltage refractory aluminum alloy power cable according to an embodiment of the present utility model;

fig. 2 is a schematic structural view of a wire core according to an embodiment of the present utility model;

fig. 3 is a schematic view of a portion of an inner sheath according to an embodiment of the present utility model.

Reference numerals illustrate:

1. a wire core; 11. an aluminum alloy conductor; 12. a conductor shielding layer; 13. an insulating layer; 14. an insulating shielding layer; 15. a metal shielding layer; 2. wrapping the layer; 3. a refractory layer; 4. an inner sheath; 41. reinforcing ribs; 5. an outer sheath; 6. a fire-resistant mud layer; 7. and (5) a filling layer.

Detailed Description

Embodiments of the present utility model are further described below with reference to the accompanying drawings.

Examples:

as shown in fig. 1-3, a medium voltage fire-resistant aluminum alloy power cable is formed by combining three wire cores 1 and wrapping the combined wire cores 1 by a wrapping layer, wherein an aluminum alloy conductor 11 is selected as a conductor of the wire cores 1, a conductor shielding layer 12, an insulating layer 13, an insulating shielding layer 14 and a metal shielding layer 15 are sequentially wrapped on the outer side of the aluminum alloy conductor 11 from inside to outside, and the conductor shielding layer 12, the insulating layer 13 and the insulating shielding layer 14 form three-layer coextrusion by adopting a dry crosslinking method; the wrapping layer on the outer side of the three-strand wire core 1 sequentially comprises a wrapping layer 2, a fire-resistant layer 3 and a sheath layer from inside to outside, and a filling layer 7 of ceramic fiber cotton is arranged at a gap between the wrapping layer 2 and a metal shielding layer 15, and the filling weight is light, the heat conductivity is low, and the softness is good; the wrapping layer 2 is a non-woven fabric belt wrapping structure.

The working principle of the technical scheme is as follows:

the wrapping layer 2 of the cable adopts a non-woven fabric belt wrapping structure, the wrapping is tight, and the multi-strand wire core 1 is sequentially wrapped from inside to outside by adopting the wrapping layer 2, the fire-resistant layer 3 and the sheath layer, so that the structure is compact; when the cable encounters combustion, the cable is burnt with insulating substances, so that the stress deformation generated by temperature fluctuation can be released in a sufficient space by outward diffusion, the extrusion damage to the fire-resistant layer 3 is reduced, and the cable adopts a cable structure with a conventional sheath and no armor, so that the cable has good bending performance, low failure rate and small influence on the fire resistance of the cable.

In another embodiment, the metal shielding layer 15 is a copper tape wrapping structure. The cable has good protection effect on the peripheral elements of the cable and is safer to use.

In another embodiment, the refractory layer 3 is made of ceramic silicone rubber. The residue of the fire-resistant layer 3 after combustion is a hard ceramic shell, has strong fire resistance, and is convenient for the cable to be used in a long-time high-temperature environment with less influence.

In another embodiment, as shown in fig. 1-3, the sheath layer comprises an inner sheath 4 and an outer sheath 5, a fireproof mud layer 6 is arranged between the inner sheath 4 and the outer sheath 5, the inner sheath 4 and the outer sheath 5 provide double-layer protection for the cable, and the fireproof mud layer 6 between the inner sheath 4 and the outer sheath has strong fireproof performance and long fireproof time. The reinforcing ribs 41 may be provided on the outer side of the inner sheath 4 to further fasten the fire-resistant mud layer 6, and the reinforcing ribs 41 may be provided at intervals in order to avoid excessive influence of the reinforcing ribs 41 on the bending performance of the cable.

The foregoing examples merely illustrate specific embodiments of the utility model, which are described in greater detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.

Claims

1. The medium-voltage fire-resistant aluminum alloy power cable comprises a plurality of wire cores and a wrapping layer arranged on the outer sides of the wire cores, and is characterized in that the wire cores comprise aluminum alloy conductors, the outer sides of the aluminum alloy conductors are sequentially wrapped with a conductor shielding layer, an insulating shielding layer and a metal shielding layer from inside to outside, the wrapping layer is sequentially a wrapping layer, a fire-resistant layer and a sheath layer from inside to outside, and a filling layer is arranged in a gap between the wrapping layer and the metal shielding layer; the wrapping layer is a non-woven fabric belt wrapping structure.

2. The medium voltage refractory aluminum alloy power cable according to claim 1, wherein the conductor shield layer, the insulation layer and the insulation shield layer are of a three-layer co-extrusion structure formed by a dry crosslinking method.

3. The medium voltage refractory aluminum alloy power cable according to claim 1, wherein the metal shield is a copper tape wrapped structure.

4. A medium voltage fire resistant aluminium alloy power cable according to claim 1, characterized in that the filler layer is ceramic fibre wool.

5. A medium voltage refractory aluminium alloy power cable according to claim 1, wherein the refractory layer is a ceramic silicone rubber.

6. The medium voltage fire resistant aluminum alloy power cable of claim 1, wherein the sheath layer comprises an inner sheath and an outer sheath, and a fire resistant mud layer is disposed between the inner sheath and the outer sheath.

7. The medium voltage refractory aluminum alloy power cable according to claim 6, wherein the outer side of the inner sheath is provided with reinforcing ribs.

8. The medium voltage refractory aluminum alloy power cable according to claim 7, wherein the reinforcing ribs are disposed at intervals along the length of the inner jacket.