CN112117043A

CN112117043A - Flame-retardant high-temperature-resistant railway signal cable

Info

Publication number: CN112117043A
Application number: CN202010804548.7A
Authority: CN
Inventors: 沈小平; 许加浩
Original assignee: Jiangsu Tongding Optic Electronic Stock Co Ltd
Current assignee: Jiangsu Tongding Optic Electronic Stock Co Ltd
Priority date: 2020-08-12
Filing date: 2020-08-12
Publication date: 2020-12-22

Abstract

The invention provides a flame-retardant high-temperature-resistant railway signal cable, which comprises a cable core and a protective layer outside the cable core; the cable core comprises at least one wire group, wherein the wire group comprises a plurality of insulating single wires which are twisted together, and an aerogel insulating layer and an asbestos layer which are sequentially coated outside the insulating single wires; the protective layer comprises a PET tape winding layer, a heat insulation layer, an asbestos layer, an aluminum sheath, an inner sheath, an asbestos layer, an armor layer and an outer sheath which are sequentially coated from inside to outside. In the invention, the protective layer structure outside the cable core is reasonably designed, the stability of the signal transmission of the cable is ensured, the transmission signal is not distorted and deformed, the safety and reliability of the cable are improved, and meanwhile, the cable is ensured to have excellent functions of temperature resistance, moisture resistance, pressure resistance, animal tooth bite resistance and the like, and the requirements of a high-speed railway on the cable in any environment are completely met.

Description

Flame-retardant high-temperature-resistant railway signal cable

Technical Field

The invention belongs to the technical field of cables, and particularly relates to a flame-retardant high-temperature-resistant railway signal cable.

Background

With the increasing construction of railways, cables are required to have general characteristics and adaptability to severe environments such as natural disasters and the like, such as fire disasters. The railway signal cable is generally laid at the edge of a track along the track as a central nervous system of the railway, if a sudden fire occurs, the cable with poor flame retardant property can not meet the requirements of site disaster relief, and the self-extinguishing time is long.

Disclosure of Invention

In view of this, the invention provides a flame-retardant high-temperature-resistant railway signal cable, which aims to overcome the defects in the prior art.

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

a flame-retardant high-temperature-resistant railway signal cable comprises a cable core and a sheath structure outside the cable core; the cable core comprises at least one wire group, and an aerogel insulation layer and an asbestos layer which are sequentially coated on the outer side of the wire group, wherein the wire group comprises a plurality of insulation single wires which are twisted together; the sheath structure comprises a PET tape winding layer, a heat insulation layer, an asbestos layer, an aluminum sheath, an inner sheath, an asbestos layer, an armor layer and an outer sheath which are sequentially coated from inside to outside.

Further, the insulated single wire includes a conductor and a conductor insulation layer wrapped around the outside thereof.

Further, the conductor insulating layer comprises an inner skin layer, an aerogel layer and an asbestos layer which are sequentially arranged from inside to outside.

Further, the inner skin layer adopts a rubber insulating layer.

Further, the inner sheath is an aerogel sheath layer.

Furthermore, the wire groups respectively comprise two or four insulated single wires with different colors.

Further, the outer sheath is a polyethylene sheath layer.

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

in the invention, the protective layer structure outside the cable core is reasonably designed, the stability of the signal transmission of the cable is ensured, the transmission signal is not distorted and deformed, the safety and reliability of the cable are improved, and meanwhile, the cable is ensured to have excellent functions of temperature resistance, moisture resistance, pressure resistance, animal tooth bite resistance and the like, and the requirements of a high-speed railway on the cable in any environment are completely met.

In addition, the conductor insulation layer formed by aerogel and asbestos and each protective layer structure outside the cable core can provide various protections for the cable core, particularly the aerogel layer and the decorative layer which are arranged at intervals, so that the cable has the advantages of excellent flame retardance and heat insulation, light weight, strong heat insulation performance, high strength and the like, the cable core can be ensured not to be damaged for a long time in a big fire, and the cable has strong heat insulation performance, and serious problems of extrusion, shrinkage, deformation, cable core fracture and the like of the cable can not occur after the cable is frozen in a pipeline or a groove.

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 diagram of two wire sets according to an embodiment of the present invention.

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.

A flame-retardant high-temperature-resistant railway signal cable comprises a cable core and a sheath structure outside the cable core; the cable core comprises at least one line group, an aerogel insulation layer 1 and a first asbestos layer 2, wherein the outer side of the line group is sequentially coated with the aerogel insulation layer 1 and the first asbestos layer 2; the sheath structure comprises a PET tape winding layer 3, a heat insulation layer 4, a second asbestos layer 5, an aluminum sheath 6, an inner sheath 7, a third asbestos layer 8, an armor layer 9 and an outer sheath 10 which are sequentially coated from inside to outside.

The aluminum sheath enables the cable to have excellent shielding performance, and the cable is not interfered by other external factors in the using process, so that the stability of signal transmission is ensured, transmission signals are not distorted and deformed, and the safety and reliability of the cable are improved. Generally, the inner sheath adopts the aerogel restrictive coating, and the insulating layer adopts prior art conventional material can. As shown in fig. 1, the cable core is a schematic structural diagram of a cable group, where the cable group includes 4 insulating single lines; as shown in fig. 2, the cable core is a schematic structural diagram including two wire groups, each of the wire groups includes 4 insulating single wires.

By way of example, the wire sets each include two or four insulated single wires of different colors. The outer sheath adopts a polyethylene sheath layer, so that the cable has excellent functions of temperature resistance, moisture resistance, pressure resistance, animal tooth bite prevention and the like, and the requirement of a high-speed railway on the cable is completely met. Of course, the existing low-smoke halogen-free flame-retardant sheath can also be adopted.

The invention creates the sequentially-coated protective layer structure adopted by the cable, which has multiple protection capabilities, the conductor insulating layer formed by aerogel and asbestos and each protective layer structure outside the cable core have extremely high fire resistance, electrical insulation and heat insulation, and the cable core can be protected from high temperature damage for a long time in case of fire. The conductor insulation layer composed of aerogel and asbestos and each protective layer structure outside the cable core can improve the insulation resistance of the cable and reduce the transmission attenuation of the cable under the condition of providing good flame retardance, thereby greatly improving the safety and reliability of the cable.

The insulated single wire includes a conductor 11 and a conductor insulation layer coated on the outside thereof. In an optional embodiment, the conductor insulation layer comprises an inner skin layer 12, an aerogel layer 13 and a fourth asbestos layer 14 which are sequentially arranged from inside to outside, and the inner skin layer, the aerogel layer 13 and the fourth asbestos layer together with the sheath structure play a role in multiple protection.

Usually, the inner skin layer is a rubber insulating layer, however, those skilled in the art may select other insulating layer materials or inner liner materials according to the requirement.

When the flame-retardant high-temperature-resistant railway signal cable is manufactured, aerogel and asbestos serve as conductor insulating layers, 2 or 4 produced insulating single wires are twisted into a wire set according to requirements, a plurality of produced wire sets are twisted into a cable core by a cabling machine according to requirements, and then a PET wrapping tape, a heat insulation layer, an asbestos layer, an aluminum sheath, an aerogel inner sheath, an asbestos layer, an armor layer and an outer sheath are sequentially coated outside the cable core. In the production process, all the wire groups in the cable core keep consistent tension, the arrangement range of the stranding pitch of the insulating single wires and the wire groups is 35-55 times of the outer diameter of the cable core, and by the structural design, the cable is guaranteed to have good stability and good mechanical performance, and all the electrical performance indexes are guaranteed to be qualified.

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 high temperature resistant type railway signal cable which characterized in that: the cable comprises a cable core and a sheath structure outside the cable core; the cable core comprises at least one wire group, and an aerogel insulation layer and an asbestos layer which are sequentially coated on the outer side of the wire group, wherein the wire group comprises a plurality of insulation single wires which are twisted together; the sheath structure comprises a PET tape winding layer, a heat insulation layer, an asbestos layer, an aluminum sheath, an inner sheath, an asbestos layer, an armor layer and an outer sheath which are sequentially coated from inside to outside.

2. The flame-retardant high-temperature-resistant type railway signal cable according to claim 1, wherein: the insulated single wire comprises a conductor and a conductor insulation layer wrapped outside the conductor.

3. The flame-retardant high-temperature-resistant type railway signal cable according to claim 2, wherein: the conductor insulating layer comprises an inner skin layer, an aerogel layer and an asbestos layer which are sequentially arranged from inside to outside.

4. The flame-retardant high-temperature-resistant type railway signal cable according to claim 3, wherein: the inner skin layer adopts a rubber insulating layer.

5. The flame-retardant high-temperature-resistant type railway signal cable according to claim 1, wherein: the inner sheath is an aerogel sheath layer.

6. The flame-retardant high-temperature-resistant type railway signal cable according to claim 1, wherein: the wire groups are composed of two or four insulated single wires with different colors.

7. The flame-retardant high-temperature-resistant type railway signal cable according to claim 1, wherein: the outer sheath is a polyethylene sheath layer.