CN214226591U

CN214226591U - High-shielding low-smoke halogen-free flame-retardant cable special for subway

Info

Publication number: CN214226591U
Application number: CN202023308748.8U
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: 2021-09-17
Anticipated expiration: 2030-12-30

Abstract

The invention provides a high-shielding low-smoke halogen-free flame-retardant subway special cable which comprises a conductive unit, and an insulating layer, an insulating shielding layer, a copper wire shielding layer, a reverse copper tape layer, a ceramic silicon rubber heat insulation layer, a copper corrugated metal sheath and an outer sheath which are sequentially coated on the outer side of the conductive unit from inside to outside, wherein the conductive unit comprises a conductor and a conductor shielding layer on the outer side of the conductor. The invention has simple structure and reasonable design, adopts the ceramic silicon rubber heat-insulating layer and the copper corrugated metal sheath as the fireproof layer and adopts the high flame-retardant sheath material as the sheath layer, the cable is not easy to burn in case of fire, and the copper corrugated metal sheath prevents the flame from burning inside the cable, and the ceramic silicon rubber forms a hard and closed heat-insulating layer shell in case of high temperature, thereby effectively preventing the flame and heat from spreading inside the cable, ensuring the integrity of the cable and ensuring that a power supply loop can maintain normal work when the cable is in case of fire.

Description

High-shielding low-smoke halogen-free flame-retardant cable special for subway

Technical Field

The invention belongs to the technical field of electric wires and cables, and particularly relates to a high-shielding low-smoke halogen-free flame-retardant special cable for a subway.

Background

The subway is an independent rail traffic system, is not influenced by ground road conditions, can normally and stably run according to design capacity, has high reliability, is quick, safe and comfortable, and meets the requirement of large transportation volume of cities, so the subway gradually appears in large and medium cities and has very large construction requirements. The existing fireproof cable for the subway is simple in structure, poor in flame-retardant and fireproof performance and use stability, and when a fire disaster happens, the situation that signals are unstable or even interrupted easily occurs, so that people are influenced to escape, and therefore the cable needs to be improved.

Disclosure of Invention

In view of this, the invention aims to overcome the defects in the prior art and provides a high-shielding low-smoke halogen-free flame-retardant cable special for subways.

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

the utility model provides a fire-retardant subway private cable of high shielding nature low smoke and zero halogen, includes insulating layer, insulating shield, copper wire shielding layer, reverse-binding copper tape layer, ceramic silicon rubber insulating layer, copper ripple metal sheath and the oversheath that electrically conductive unit and the electrically conductive unit outside from interior to exterior cladding in proper order, electrically conductive unit includes the conductor and the conductor shielding layer in the conductor outside.

Further, the outer sheath is made of low-smoke halogen-free flame-retardant polyolefin.

Furthermore, the conductor adopts a second type conductor structure meeting the requirements of GB/3956-.

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

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

Furthermore, be equipped with buffer structure between back-prick copper tape layer and the copper wire shielding layer, this buffer structure is including the interlayer that encircles the copper wire shielding layer outside, has arranged a plurality of support archs at interlayer inner wall interval.

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

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

the invention has simple structure and reasonable design, adopts the ceramic silicon rubber heat-insulating layer and the copper corrugated metal sheath as the fireproof layer and adopts the high flame-retardant sheath material as the sheath layer, the cable is not easy to burn in case of fire, and the copper corrugated metal sheath prevents the flame from burning inside the cable, and the ceramic silicon rubber forms a hard and closed heat-insulating layer shell in case of high temperature, thereby effectively preventing the flame and heat from spreading inside the cable, ensuring the integrity of the cable and ensuring that a power supply loop can maintain normal work when the cable is in case of fire.

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-a ceramic silicon rubber heat insulation layer; 6-copper corrugated metal sheath; 7-an outer sheath; 8-a conductor; 9-a conductor shield layer; 10-a barrier layer; 11-a support protrusion; 12-a 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.

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.

The utility model provides a fire-retardant subway private cable of high shielding nature low smoke and zero halogen, as shown in figure 1, including the sheath structure in the electrically conductive unit and the electrically conductive unit outside, the sheath structure includes from interior to exterior insulating layer 1, insulating shield 2, copper wire shielding layer 3, the copper strips layer 4 of prickling conversely, pottery silicon rubber insulating layer 5, copper ripple metal sheath 6 and oversheath 7 of cladding in proper order, the electrically conductive unit includes conductor 8 and the conductor shielding layer 9 in the conductor outside. Typically, the insulating layer is made of a cross-linked polyethylene material. The copper corrugated metal sheath is a fireproof material with excellent fireproof performance, can keep integrity at the temperature of 1000 ℃ and below, and can block flame outside the copper corrugated metal sheath under the condition of fire, so that the direct combustion of the flame on the internal structure of the cable is avoided, the cable structure is damaged, and the cable can supply power continuously under the condition of fire.

Through practice, the ceramic silicon rubber heat insulation layer and the copper corrugated metal sheath are used as the fireproof layers, the normal power supply of a line can be ensured under the condition that the flame lasts 180min at 950 ℃, and the cable passes through a horizontal combustion test, a water spraying test and a mechanical impact vibration combustion test under the most strict condition specified by combustion test standards such as national standards GB/T19666-2019, GB/T19216-2003, British standards BS6387-2013, BS 8491-2008 and the like.

The outer sheath adopts a low-smoke halogen-free flame-retardant polyolefin sheath, the oxygen index of the low-smoke halogen-free flame-retardant polyolefin material is up to more than 50, and the cable is difficult to burn. The conductor adopts a two-class conductor structure meeting the requirements of GB/3956-. Generally, the copper wire shielding layer is made of 1mm annealed soft copper wire, and preferably, the wrapping 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 ceramic silicon rubber heat insulation layer, the buffer structure comprises a partition layer 10 surrounding the outer side of the copper wire shielding layer, and a plurality of supporting protrusions 11 are arranged on the inner wall of the partition 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 protective layer structure forms the cavity 12 between two adjacent supporting protrusions to isolate heat transfer, thereby effectively playing a role of thermal insulation.

It should be noted that the sum of the areas of the end faces of the supporting protrusions facing the cable core is generally smaller than 1/4 of the total area of the inner wall of the water blocking barrier. In order to ensure the structural strength, the sum of the areas of the end surfaces of the supporting protrusions facing one side of the cable core is generally larger 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 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 a fire-retardant subway special cable of high shielding nature low smoke and zero halogen which characterized in that: the insulating layer, the insulating shielding layer, the copper wire shielding layer, the reverse binding copper tape layer, the ceramic silicon rubber heat insulation layer, the copper corrugated metal sheath and the outer sheath are sequentially coated on the outer sides of the conductive unit from inside to outside, and the conductive unit comprises a conductor and a conductor shielding layer on the outer side of the conductor.

2. The high-shielding low-smoke halogen-free flame-retardant special cable for the subway according to claim 1, wherein: the outer sheath is a low-smoke halogen-free flame-retardant polyolefin sheath.

3. The high-shielding low-smoke halogen-free flame-retardant special cable for the subway according to claim 1, wherein: the conductor adopts a two-class conductor structure meeting the requirements of GB/3956-.

4. The high-shielding low-smoke halogen-free flame-retardant special cable for the subway according to claim 1, wherein: the lapping clearance of the copper wire shielding layer is less than or equal to 200 percent.

5. The high-shielding low-smoke halogen-free flame-retardant special cable for the subway according to claim 4, wherein: the copper wire shielding layer is made of 1mm annealed soft copper wires.

6. The high-shielding low-smoke halogen-free flame-retardant special cable for the subway according to claim 1, wherein: the insulating layer is made of a cross-linked polyethylene material.