CN210467418U

CN210467418U - 35kV medium-voltage fire-resistant cable

Info

Publication number: CN210467418U
Application number: CN201921734256.XU
Authority: CN
Inventors: 刘曹江; 余静成; 张灿
Original assignee: Anhui Shangwei Cable Co Ltd
Current assignee: Anhui Shangwei Cable Co Ltd
Priority date: 2019-10-16
Filing date: 2019-10-16
Publication date: 2020-05-05
Anticipated expiration: 2029-10-16

Abstract

The utility model relates to the technical field of medium voltage fire-resistant cables, in particular to a 35kV medium voltage fire-resistant cable, which comprises a plurality of conductors, wherein the conductors are sequentially provided with a conductor shielding layer, an insulating layer and an insulating shielding layer from inside to outside; a semi-conductive buffer belt is arranged on the outer side of the insulation shielding layer, a copper strip shielding layer is arranged on the outer side of the semi-conductive buffer belt, and the copper strip shielding layer is manufactured by copper strip wrapping; the outer sides of the plurality of conductors are provided with cabling wrapping layers; a fireproof layer is arranged on the outer side of the cabling wrapping layer and made of a ceramic silicon rubber material; the outer side of the fire-resistant layer is provided with a cooling oxygen-insulating layer which is prepared by taking polyethylene as a matrix and kneading magnesium hydroxide; an armor layer is arranged on the outer side of the fire-resistant layer, and an outer sheath layer is arranged on the outer side of the armor layer; the utility model provides a 35kV middling pressure fire resisting cable, simple structure separates the multi-level protection cable of oxygen layer through setting up the flame retardant coating, cooling, possesses stronger fire behavior.

Description

35kV medium-voltage fire-resistant cable

Technical Field

The utility model relates to a middling pressure fire resisting cable technical field, concretely relates to 35kV middling pressure fire resisting cable.

Background

China is in a high-speed development stage, and the fire-resistant cable is widely applied to important occasions such as power stations, nuclear power stations, subways, power plants, high-rise buildings and the like. The medium-voltage 35KV cable has higher requirement on fire resistance, and once the fire resistance level cannot meet the requirement, the safety performance of the cable cannot be guaranteed.

Flame generally needs high temperature, and the cooperation of oxygen just can generate, consequently, the utility model discloses when not changing fire-resistant cable electrical apparatus performance itself, carry out cable and separate oxygen, cooling, the multiple way of heat absorption and ensure that the cable possesses better fire resistance.

SUMMERY OF THE UTILITY MODEL

For solving the problem that proposes among the above-mentioned background art, the utility model provides a 35kV middling pressure fire resisting cable, simple structure separates the multi-level protection cable of oxygen layer through setting up the flame retardant coating, cooling, possesses stronger fire behavior.

In order to achieve the above object, the utility model provides a following technical scheme: a35 kV medium-voltage fire-resistant cable comprises a plurality of conductors, wherein the conductors are made of annealed copper wires; the conductor is sequentially provided with a conductor shielding layer, an insulating layer and an insulating shielding layer from inside to outside; a semi-conductive buffer belt is arranged on the outer side of the insulation shielding layer, a copper strip shielding layer is arranged on the outer side of the semi-conductive buffer belt, and the copper strip shielding layer is manufactured by copper strip wrapping; the outer sides of the plurality of conductors are provided with cabling wrapping layers; a fireproof layer is arranged on the outer side of the cabling wrapping layer and made of a ceramic silicon rubber material; the outer side of the fire-resistant layer is provided with a cooling oxygen-insulating layer which is prepared by taking polyethylene as a matrix and kneading magnesium hydroxide; the outside of flame retardant coating is provided with the armor, and the outside of armor is provided with the oversheath layer.

Furthermore, the conductor shielding layer, the insulating layer and the insulating shielding layer are of a three-layer co-extrusion structure.

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

Furthermore, the semiconductive buffer belt is made of polyethylene material added with conductive carbon black.

Furthermore, the cabling wrapping layer is made of fire-resistant non-woven fabrics.

Furthermore, a filling layer is arranged in a gap between the plurality of conductors and the cabling wrapping layer, and the filling layer is made of flame-retardant high-temperature filling ropes.

Furthermore, the armor layer is made of double-layer galvanized steel strips.

Furthermore, the outer sheath layer is a low-smoke halogen-free flame-retardant polyethylene sheath layer, and the thickness of the outer sheath layer is 3.2-3.5mm

Compared with the prior art, the beneficial effects of the utility model are that:

1. a fireproof layer is arranged on the outer side of the cabling wrapping layer and made of a ceramic silicon rubber material; the ceramic silicon rubber material is a novel high-molecular refractory material, is safe and economical, and has excellent refractory performance; the outer side of the fire-resistant layer is provided with a cooling oxygen-insulating layer which is prepared by taking polyethylene as a matrix and kneading magnesium hydroxide; when the magnesium hydroxide is burnt, the magnesium hydroxide absorbs heat in the surrounding air, the temperature of the cable is reduced, the generated water molecules also absorb heat by evaporation, and an insoluble and infusible metal oxide shell generated by the reaction has the function of isolating oxygen, so that the fire resistance of the cable is increased.

The outer side of the fire-resistant layer is provided with an armor layer, so that the mechanical performance of the cable is improved, the outer side of the armor layer is provided with an outer sheath layer, and the outer sheath layer adopts a low-smoke halogen-free flame-retardant polyethylene sheath layer.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1. a conductor; 2. a conductor shield layer; 3. an insulating layer; 4. an insulating shield layer; 5. a semiconductive buffer tape; 6. a copper strip lapping layer; 7. a filling layer; 8. a cabling lapping layer; 9. a refractory layer; 10. a cooling oxygen-isolating layer; 11. an armor layer; 12. an outer jacket layer.

Detailed Description

In order to make the objects and technical solutions of the present invention clear and fully described, and the advantages thereof more clearly understood, the embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of some, but not all, embodiments of the present invention and are not to be considered as limiting, and that all other embodiments can be made by one of ordinary skill in the art without any inventive work.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "a," "an," "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

For the purposes of simplicity and explanation, the principles of the embodiments are described by referring mainly to examples. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. It will be apparent, however, to one skilled in the art that the embodiments may be practiced without these specific details. In some instances, well-known methods and structures have not been described in detail so as not to unnecessarily obscure the embodiments. In addition, all embodiments may be used in combination with each other.

Example one

Referring to fig. 1, the present invention provides the following technical solutions: a35 kV medium-voltage fire-resistant cable comprises a plurality of conductors 1, wherein the conductors 1 are made of annealed copper wires; the conductor 1 is sequentially provided with a conductor shielding layer 2, an insulating layer 3 and an insulating shielding layer 4 from inside to outside; a semi-conductive buffer belt 5 is arranged on the outer side of the insulation shielding layer 4, a copper strip shielding layer 6 is arranged on the outer side of the semi-conductive buffer belt 5, and the copper strip shielding layer 6 is formed by wrapping a copper strip; the outer sides of the conductors 1 are provided with cabling wrapping layers 8; a fire-resistant layer 9 is arranged on the outer side of the cabling wrapping layer 8, and the fire-resistant layer 9 is made of a ceramic silicon rubber material; a cooling oxygen-insulating layer 10 is arranged on the outer side of the fire-resistant layer 9, and the cooling oxygen-insulating layer 10 is prepared by taking polyethylene as a matrix and kneading magnesium hydroxide; an armor layer 11 is arranged on the outer side of the fire-resistant layer 9, and an outer sheath layer 12 is arranged on the outer side of the armor layer 11.

According to the above embodiment, the outer sheath layer 12 at the outermost side of the cable adopts a low-smoke halogen-free flame-retardant polyethylene sheath layer, and meets the environmental protection requirement; the armor layer 11 improves the mechanical performance of the cable; the cooling oxygen-isolating layer 10 is prepared by taking polyethylene as a matrix and kneading magnesium hydroxide; the magnesium hydroxide absorbs heat in the surrounding air when being burnt, the temperature of the cable is reduced, the generated water molecules also absorb heat when being evaporated, and an insoluble infusible metal oxide shell generated by the reaction has the function of isolating oxygen, so that the fire resistance of the cable is increased; the fire-resistant layer 9 is made of ceramic silicon rubber material; the ceramic silicon rubber material is a novel high-molecular refractory material, is safe and economical, and has excellent refractory performance; the copper strip shielding layer 6 on the inner side is manufactured by wrapping a copper strip; as a metal material, the cable can resist further penetration of flame, so that the cable structure is more stable;

in order to reduce the gap between the conductor shielding layer 2, the insulating layer 3 and the insulation shielding layer 4, according to the above embodiment, in particular, referring to fig. 1, the conductor shielding layer 2, the insulating layer 3 and the insulation shielding layer 4 are a three-layer co-extrusion structure.

In order to provide the insulating layer 3 with excellent insulating performance and certain fire resistance, according to the above embodiment, specifically, referring to fig. 1, the insulating layer 3 is made of a cross-linked polyethylene material.

In order to provide the semiconductive buffer tape 5 with excellent semiconductive properties and high temperature resistance, according to the above embodiment, in particular, referring to fig. 1, the semiconductive buffer tape 5 is made of polyethylene material added with conductive carbon black.

In order to make the cabling wrapping 8 also have a certain fire resistance, according to the above embodiment, in particular, referring to fig. 1, the cabling wrapping 8 is made of fire-resistant non-woven fabric.

In order to facilitate cabling, according to the above embodiment, specifically, referring to fig. 1, a filling layer 7 is disposed in a gap between a plurality of conductors 1 and a cabling wrapping layer 8, and the filling layer 7 is made of a flame-retardant high-temperature filling rope.

In order to increase the mechanical strength of the cable, according to the above embodiment, in particular, referring to fig. 1, the armor layer 11 is made of a double-layer galvanized steel strip.

In order to make the outer sheath layer 12 meet the environmental protection requirement, according to the above embodiment, specifically, referring to fig. 1, the outer sheath layer 12 is a low smoke halogen-free flame retardant polyethylene sheath layer, and the thickness of the outer sheath layer 12 is 3.2 mm.

Example two

The structure, the implementation mode and the beneficial effects of the embodiment are the same as those of the first embodiment except that the thickness of the sheath layer 12 is 3.5 mm.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A35 kV medium voltage fire-resistant cable comprises a plurality of conductors (1), and is characterized in that: the conductor (1) is made of annealed copper wires; the conductor (1) is sequentially provided with a conductor shielding layer (2), an insulating layer (3) and an insulating shielding layer (4) from inside to outside; a semi-conductive buffer belt (5) is arranged on the outer side of the insulation shielding layer (4), a copper strip shielding layer (6) is arranged on the outer side of the semi-conductive buffer belt (5), and the copper strip shielding layer (6) is formed by winding a copper strip; the outer sides of the conductors (1) are provided with cabling wrapping layers (8); a fire-resistant layer (9) is arranged on the outer side of the cabling wrapping layer (8), and the fire-resistant layer (9) is made of ceramic silicon rubber materials; a cooling oxygen-insulating layer (10) is arranged on the outer side of the fire-resistant layer (9), and the cooling oxygen-insulating layer (10) is prepared by taking polyethylene as a matrix and kneading magnesium hydroxide; the outer side of the fire-resistant layer (9) is provided with an armor layer (11), and the outer side of the armor layer (11) is provided with an outer sheath layer (12).

2. The 35kV medium voltage fire-resistant cable according to claim 1, wherein: the conductor shielding layer (2), the insulating layer (3) and the insulating shielding layer (4) are of a three-layer co-extrusion structure.

3. The 35kV medium voltage fire resistant cable according to claim 2, wherein: the insulating layer (3) is made of a cross-linked polyethylene material.

4. The 35kV medium voltage fire-resistant cable according to claim 1, wherein: the semi-conductive buffer belt (5) is made of polyethylene material added with conductive carbon black.

5. The 35kV medium voltage fire-resistant cable according to claim 1, wherein: the cabling lapping layer (8) is made of fire-resistant non-woven fabrics.

6. The 35kV medium voltage fire-resistant cable according to claim 1, wherein: and a plurality of filling layers (7) are arranged in gaps between the conductors (1) and the cabling wrapping layers (8), and the filling layers (7) are made of flame-retardant high-temperature filling ropes.

7. The 35kV medium voltage fire-resistant cable according to claim 1, wherein: the armor layer (11) is made of double-layer galvanized steel strips.

8. The 35kV medium voltage fire-resistant cable according to claim 1, wherein: the outer sheath layer (12) adopts a low-smoke halogen-free flame-retardant polyethylene sheath layer, and the thickness of the outer sheath layer (12) is 3.2-3.5 mm.