CN112768131A

CN112768131A - Aluminum corrugated metal sheath fireproof cable for subway

Info

Publication number: CN112768131A
Application number: CN202011623384.4A
Authority: CN
Inventors: 沈小平; 郑长亮; 王先革; 戴伟斌; 肖伟
Original assignee: Tongding Interconnection Information Co Ltd
Current assignee: Tongding Interconnection Information Co Ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-05-07

Abstract

The invention provides an aluminum corrugated metal sheath fireproof cable for subways, which comprises a conductive unit and a protective layer structure outside the conductive unit; the protective layer structure comprises an insulating layer, an insulating shielding layer, a copper wire shielding layer, a reverse-binding copper tape layer, a glass fiber tape wrapping layer, an inner sheath, an aluminum corrugated metal sheath, a fireproof mud layer and an outer sheath which are sequentially coated from inside to outside; and a drainage conducting wire is arranged between the reverse-binding copper belt layer and the glass fiber belt layer, and a buffer structure is arranged between the reverse-binding copper belt layer and the glass fiber belt layer. The high-flame-retardant cable sheath has reasonable structural design, and the high-flame-retardant sheath material is used as the sheath layer, so that even if a fire occurs, the fire-proof mud and the aluminum corrugated metal sheath are burnt and sintered to form a shell, flame and heat are prevented from spreading to the inside of the cable, the requirement that the power supply loop can maintain normal work when the cable is in a fire is met, the release amount of toxic and corrosive gases generated during the burning of the cable is very small, the flame-retardant effect is very good, and the concentration of generated smoke is very low.

Description

Aluminum corrugated metal sheath fireproof cable for subway

Technical Field

The invention belongs to the technical field of electric wires and cables, and particularly relates to an aluminum corrugated metal sheath fireproof cable for a subway.

Background

Along with the rapid development of economy in China, the urban modernization process is obviously accelerated, subways gradually appear in large and medium cities, and the construction requirements are very large. In recent years, fire disasters cause great loss of lives and properties of people, people have deeper understanding on fire safety, the requirements for electric wires and cables used in important occasions are higher and higher, and in the important occasions such as subway stations, when a fire disaster happens, a power supply loop needs to maintain normal work to ensure normal supply of electric power, rescue and self-rescue efficiency is improved, and personal injuries and property losses are reduced. However, the existing cable has poor compression resistance and unstable shielding performance, and is easy to generate signal fluctuation and even interrupt particularly under extreme working conditions, and particularly when a fire disaster occurs, the cable has poor flame resistance and environmental protection performance, and can influence rescue and escape of trapped people.

Disclosure of Invention

In view of this, the present invention provides an aluminum corrugated metal sheath fireproof cable for subways, which is designed to overcome the defects in the prior art.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

an aluminum corrugated metal sheath fireproof cable for subways comprises a conductive unit and a sheath structure outside the conductive unit; the protective layer structure comprises an insulating layer, an insulating shielding layer, a copper wire shielding layer, a reverse-binding copper tape layer, a glass fiber tape wrapping layer, an inner sheath, an aluminum corrugated metal sheath, a fireproof mud layer and an outer sheath which are sequentially coated from inside to outside; the conductive unit comprises a conductor and a conductor shielding layer coated on the outer side of the conductor, a drainage wire is arranged between the reverse-binding copper tape layer and the glass fiber tape layer, and the conductor adopts a second-class conductor structure meeting the resistance requirement of GB/3956-.

Furthermore, a buffer structure is arranged between the reverse-binding copper belt layer and the glass fiber belt wrapping layer

Furthermore, the lapping clearance of the copper wire shielding layer is less than or equal to 200%.

Further, the inner sheath and the outer sheath are both made of low-smoke halogen-free flame-retardant polyolefin sheaths.

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

Furthermore, the copper wire shielding layer is made of 1mm annealed soft copper wires.

Compared with the prior art, the invention has the following advantages:

the high-flame-retardant cable sheath has reasonable structural design, and the high-flame-retardant sheath material is used as the sheath layer, so that even if a fire occurs, the fire-proof mud and the aluminum corrugated metal sheath form a shell after being burned and sintered, flame and heat are prevented from spreading to the inside of the cable, and the requirement that a power supply loop can be ensured to maintain normal work when the cable is in a fire is met. The cable has the advantages of little release amount of toxic and corrosive gases generated during combustion, extremely low concentration of generated smoke, no harm to personnel and equipment, excellent flame retardant effect and capability of providing reliable guarantee for life rescue and escape.

Drawings

The accompanying drawings, which 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 without limitation. In the drawings:

FIG. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic view of an embodiment of the present invention with a buffer structure;

fig. 3 is a schematic diagram of a buffer structure in an embodiment of the invention.

Description of reference numerals: 1-an insulating layer; 2-insulating shielding layer; 3-a copper wire shielding layer; 4-reverse binding a copper tape layer; 5-glass fiber tape wrapping layer; 6-inner sheath; 7-aluminum corrugated metal sheath; 8-fireproof mud layer; 9-an outer sheath; 10-a conductor; 11-a conductor shield layer; 12-a barrier layer; 13-a support projection; 14-hollow cavity.

Detailed Description

It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.

In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable 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 creation of the present invention can be understood by those of ordinary skill in the art through specific situations.

The invention will be described in detail with reference to the following embodiments with reference to the attached drawings.

An aluminum corrugated metal sheath fireproof cable for subways comprises a conductive unit and a sheath structure outside the conductive unit, as shown in figure 1; the protective layer structure comprises an insulating layer 1, an insulating shielding layer 2, a copper wire shielding layer 3, a reverse binding copper strip layer 4, a glass fiber strip belting layer 5, an inner sheath 6, an aluminum corrugated metal sheath 7, a fireproof mud layer 8 and an outer sheath 9 which are sequentially coated from inside to outside; the conductive unit comprises a conductor 10 and a conductor shielding layer 11 coated on the outer side of the conductor. The aluminum corrugated metal sheath has a certain fire retardant function and can keep integrity at the temperature of 660 ℃ and below.

Preferably, the fire-proof mud layer is made of a fire-proof mud containing aluminum hydroxide and/or sodium silicate materials. The fire-proof mud has excellent fire-proof and fire-proof performances, and can be quickly hardened under the condition of 350 ℃ and above flame or no flame, and can be quickly fired into a ceramic-shaped hard and complete shell along with the rise of temperature, the higher the burning time is, the higher the temperature is, the harder the shell is, the hard shell after burning can not be melted and dropped in the environment of fire (650 + 1300 ℃), and can bear certain water spray and certain intensity vibration, so that the cable has the effects of heat insulation and oxygen isolation, the burning flame can not spread and burn into the cable, the circuit is well protected, and the smooth power supply of the circuit under the fire condition is guaranteed. The inorganic flame retardant aluminum hydroxide is decomposed into aluminum oxide and water during cable combustion, the generated aluminum oxide can form a shell-shaped structure and is not combusted, and the generated water has the effects of flame retardance and cooling.

The conductor adopts a two-class conductor structure meeting the requirements of GB/3956-. The copper wire shielding layer is made of 1mm annealed soft copper wires, and preferably, the lapping clearance of the copper wire shielding layer is less than or equal to 200%.

In an alternative embodiment, as shown in fig. 2 and 3, a buffer structure is arranged between the reverse-binding copper tape layer and the glass fiber tape wrapping layer, the buffer structure comprises a barrier layer 12 surrounding the outer side of the copper wire shielding layer, and a plurality of supporting protrusions 13 are arranged on the inner wall of the barrier layer at intervals. For example, the interlayer is usually made of PVC, PTFE or PET, and those skilled in the art can select the material of the interlayer as required, and set the supporting protrusions on the inner wall of the interlayer, so that the hollow cavity 14 is formed between two adjacent supporting protrusions of the protective layer structure, thereby isolating heat transfer and effectively functioning as a thermal insulator.

It should be noted that the sum of the areas of the end surfaces of the supporting protrusions facing the cable core is generally less than 1/4 of the total area of the inner wall of the water-blocking barrier, and in order to ensure the structural strength, the sum of the areas of the end surfaces of the supporting protrusions facing the cable core is generally greater than 1/6 of the total area of the inner wall of the water-blocking barrier. Such structural design not only makes the cavity structure that forms between the support arch can effectively separate the temperature to, allow the interlayer not to set up the bellied part of support and produce certain deformation, play the cushioning effect, when receiving the impact, can effectively weaken the injury of impact, the loaded ability of cable obtains the reinforcing, when receiving impact or extrusion, supports the bellied part and can play effectual supporting role, guarantees the radial structural strength of cable core.

The inner sheath and the outer sheath are both made of low-smoke halogen-free flame-retardant polyolefin sheaths, high-flame-retardant halogen-free low-smoke cable materials are adopted, the oxygen index of the materials is up to more than 50, and the cables are difficult to burn even under the condition of fire. A drainage wire can be arranged between the reverse-binding copper belt layer and the glass fiber belt layer. The insulating layer is made of cross-linked polyethylene material.

The high-flame-retardant cable sheath is reasonable in structural design, the high-flame-retardant sheath material is used as the sheath layer, and even if a fire occurs, the fireproof mud and the aluminum corrugated metal sheath are burnt and sintered to form the shell, so that the shell is closed and hard, flame and heat are effectively prevented from spreading to the inside of the cable, and the requirement that a power supply loop can be guaranteed to normally work when the cable is in a fire is met. The cable has the advantages of little release amount of toxic and corrosive gases generated during combustion, extremely low concentration of generated smoke, no harm to personnel and equipment, excellent flame retardant effect and capability of providing reliable guarantee for life rescue and escape.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.

Claims

1. The utility model provides an aluminium ripple metal sheath fireproof cable for subway which characterized in that: comprises a conductive unit and a protective layer structure outside the conductive unit; the protective layer structure comprises an insulating layer, an insulating shielding layer, a copper wire shielding layer, a reverse-binding copper tape layer, a glass fiber tape wrapping layer, an inner sheath, an aluminum corrugated metal sheath, a fireproof mud layer and an outer sheath which are sequentially coated from inside to outside; and a drainage wire is arranged between the reverse-bundling copper tape layer and the glass fiber tape layer.

2. The aluminum corrugated metal sheath fireproof cable for the subway as claimed in claim 1, wherein: and a buffer structure is arranged between the reverse-bundling copper belt layer and the glass fiber belt wrapping layer.

3. The aluminum corrugated metal sheath fireproof cable for the subway as claimed in claim 1, wherein: the lapping clearance of the copper wire shielding layer is less than or equal to 200 percent.

4. The aluminum corrugated metal sheath fireproof cable for the subway as claimed in claim 1, wherein: the inner sheath and the outer sheath are both made of low-smoke halogen-free flame-retardant polyolefin sheaths.

5. The aluminum corrugated metal sheath fireproof cable for the subway as claimed in claim 1, wherein: the insulating layer is made of a cross-linked polyethylene material.

6. The aluminum corrugated metal sheath fireproof cable for the subway as claimed in claim 1, wherein: the copper wire shielding layer is made of 1mm annealed soft copper wires.

7. The aluminum corrugated metal sheath fireproof cable for the subway as claimed in claim 1, wherein: the conductor adopts a two-class conductor structure meeting the requirements of GB/3956-.