CN201425847Y - Low-smoke, halogen-free, flame-retardant integrated shielded subway light rail signal cable - Google Patents

Abstract

A low-smoke, halogen-free, flame-retardant comprehensive shielded subway light rail signal cable, including a cable core and an outer sheath. There are several wire groups in the cable core. With armored shielding layer, half or more of the wire groups in several wire groups are provided with a shielding layer outside, and a cable core shielding layer is provided between the cable core tape layer and the steel tape armored shielding layer. The diameter of the conductor of each wire of the utility model is 0.40mm-1.53mm, and the insulating layer of each wire is a skin-bubble-skin structure or a bubble-skin structure; the structure of the shielding layer of the wire group is: double-layer or single-layer Copper tape wrapping or single-layer copper strip longitudinal wrapping or copper wire or tinned copper wire braiding; cable core shielding layer is made of aluminum-plastic composite tape or pure aluminum tape or pure copper tape longitudinal wrapping. The utility model has a good shielding function, which can reduce the mutual interference between the cable wire groups and the interference of the external electromagnetic field on the cable; the mechanical and physical properties and flame-retardant performance are enhanced, and can meet the use requirements of the existing subway light rail system for signal cables .

Description

Low-smoke, halogen-free, flame-retardant integrated shielded subway light rail signal cable

technical field

The utility model relates to a signal cable, in particular to a signal cable used in the field of rail transportation such as subway light rail.

Background technique

The existing signal cables used in the field of rail transit such as subway light rail, its basic structure is: the insulated wires are twisted into a wire group, the wire group is twisted into a cable core, and the steel tape armored shielding layer and the outer sheath are wrapped around the cable core. set. The insulation layer structure of the insulated wire is a solid core insulation layer, and the transmission attenuation is relatively large; there is no electromagnetic shielding structure between the wire groups in the cable core, and there is a certain mutual interference; there is only one layer of steel tape armored shielding outside the cable core Layer, the ability to resist electromagnetic interference is poor.

Contents of the invention

In order to overcome the shortcomings of the existing signal cables used in the field of subway light rail and other rail transportation, the utility model provides a low-smoke, halogen-free, flame-retardant comprehensive shielded signal cable for subway light rail. The transmission attenuation of this kind of cable is small; the mutual interference between the wire groups in the cable core is small; the ability of the cable to resist electromagnetic interference is strong.

The utility model provides a low-smoke, halogen-free, flame-retardant comprehensive shielded subway light rail signal cable, which includes a cable core and an outer sheath. There are several wire groups in the cable core, and the cable core is coated sequentially between the cable core and the outer sheath. Tape layer, steel tape armored shielding layer, half or more of the wire groups in several wire groups are provided with a shielding layer outside, and a cable core shielding layer is provided between the cable core tape layer and the steel tape armored shielding layer .

The diameter of the conductor of each wire of the utility model is 0.40mm-1.53mm, and the insulating layer of each wire is a skin-bubble-skin structure or a bubble-skin structure.

The structure of the shielding layer of the wire group of the utility model is: double-layer or single-layer copper strip wrapping or single-layer copper strip embossing longitudinal wrapping or braided by copper wire or tinned copper wire.

The cable core shielding layer of the utility model is made of longitudinally wrapping aluminum-plastic composite tape or pure aluminum tape or pure copper tape.

The beneficial effects of the utility model are: good shielding function, which can reduce the mutual interference between the cable wire groups and the interference of the external electromagnetic field on the cable; the mechanical and physical properties and the flame-retardant performance are enhanced, which can meet the requirements of the existing subway light rail system. Requirements for the use of signal cables.

Description of drawings

Fig. 1 is a schematic cross-sectional view of the utility model.

In Figure 1, 1. Conductor, 2. Insulation layer, 3. Conductor, 4. Conductor group, 5. Cable core, 6. Conductor group with shielding layer, 7. Shielding layer, 8. Cable core tape layer , 9. Cable core shielding layer, 10. Steel tape armored shielding layer, 11. Outer sheath.

Detailed ways

Referring to Fig. 1, a conductor 1 with a diameter between 0.40mm-1.53mm is coated with an insulating layer 2 of a skin-bubble-skin structure or a bubble-skin structure to make a wire 3, and the wire 3 is twisted to make a wire group 4 , and half or more of the wire groups are coated with a shielding layer 7 to form a wire group 6 provided with a shielding layer 7 . The shielding layer 7 is made of double-layer or single-layer copper strip wrapping or single-layer copper strip embossing longitudinal wrapping or braided by copper wire or tinned copper wire. Then several wire groups 4 and several wire groups 6 with shielding layers 7 are twisted into a cable core 5, and after the cable core 5 is covered with a cable core tape layer 8, an aluminum-plastic composite tape or a pure aluminum tape or a pure aluminum tape is used. Copper tape longitudinally clad cable core shielding layer 9, and then wrapped with double-layer steel tape or single-layer steel tape embossed longitudinally clad steel tape armored shielding layer 10, and then covered with low-smoke, halogen-free, flame-retardant polyolefin sheathing material Outer sheath11.

Claims (2)

1, a kind of low-smoke halogen-free flame-retardant comprehensive shielded subway light rail signal cable, comprise cable core and oversheath, have several lead groups in the cable core, coat cable core belting layer, steel-tape armouring screen between cable core and the oversheath successively, it is characterized in that having in several lead groups half and more lead group to be provided with screen outward, between cable core belting layer and steel-tape armouring screen, be provided with the cable core screen.

2, by the described low-smoke halogen-free flame-retardant comprehensive shielded subway light rail signal cable of claim 1, the diameter that it is characterized in that the conductor of every lead is 0.40mm-1.53mm, and the insulating barrier of every lead is skin-bubble-skin structure or bubble-skin structure.

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