Low-smoke halogen-free flame-retardant cable for rail transit

Abstract

The utility model discloses a low-smoke halogen-free flame-retardant cable for rail transit, which comprises a cable core, a shielding layer arranged outside the cable core, an insulating layer arranged outside the shielding layer, the cable core, the shielding layer and the insulating layer form a cable core group, the cable core group is provided with two groups which are attached to each other, an inner sheath layer is arranged outside the two groups of cable core groups, and a buffer piece is arranged between the inner sheath layer and the cable core group. The outer side of the inner sheath layer is provided with a flame-retardant layer, the outer side of the flame-retardant layer is provided with a plurality of reinforcing members which are sequentially arranged in the circumferential direction, the outer sides of the reinforcing members are provided with a waterproof layer, and the outer side of the waterproof layer is provided with an outer sheath According to the utility model, through the arrangement of the reinforcing members which are arranged closely, on one hand, the overall strength of the cable is improved, and on the other hand, the flame-retardant performance is enhanced; meanwhile, the reinforcer is limited by the flame-retardant layer, so that the arrangement stability of the reinforcer is ensured; therefore, the compression resistance and the flame retardant property are integrally ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, and in particular to a low-smoke, halogen-free, flame-retardant cable for rail transit. Background Art

[0002] Due to the particularity of rail transit construction, the safety and reliability requirements for the power system are relatively high; among them, the flame retardant performance and pressure resistance of the cable are more important. The flame retardant performance of existing cables is generally ensured by setting a low-smoke halogen-free flame retardant sheath layer to ensure the flame retardant performance of the cable. However, the conventional flame retardant sheath covering the cable core directly squeezes the cable core, and then there is a problem of increased pressure on the cable core. For cables that need to be buried in the foundation in underground rail transit construction, there is room for improvement. Utility Model Content

[0003] The purpose of the utility model is to provide a cable that has high flame retardancy and good compression resistance in view of the deficiencies in the above-mentioned background technology.

[0004] In order to achieve the above purpose, the utility model provides a low-smoke halogen-free flame-retardant cable for rail transit, which adopts the following technical solutions:

[0005] A low-smoke, halogen-free, flame-retardant cable for rail transit, comprising a wire core, a shielding layer is arranged on the outside of the wire core, an insulating layer is arranged on the outside of the shielding layer, the wire core, the shielding layer and the insulating layer form a cable core group, two groups of cable core groups are provided, which are arranged in close contact, inner sheath layers are arranged on the outside of the two groups of cable core groups, a buffer is provided between the inner sheath layer and the cable core group, a flame retardant layer is provided on the outside of the inner sheath layer, a plurality of reinforcing members arranged circumferentially in sequence are provided on the outside of the flame retardant layer, a waterproof layer is provided on the outside of the reinforcing member, and an outer sheath layer is provided on the outside of the waterproof layer.

[0006] A further improvement of the low-smoke halogen-free flame-retardant cable for rail transit of the utility model is that a plurality of arc-shaped parts are arranged on the outer side of the flame-retardant layer, and the arc-shaped parts correspond to the reinforcing members one by one.

[0007] A further improvement of the low-smoke, halogen-free and flame-retardant cable for rail transit of the utility model is that adjacent reinforcement members are in conflict with each other.

[0008] A further improvement of the low-smoke halogen-free flame-retardant cable for rail transit of the utility model is that the reinforcement member comprises a metal outer layer, and the metal outer layer is filled with a flame-retardant filler.

[0009] Compared with the prior art, the beneficial effects of the utility model are:

[0010] The utility model improves the overall strength of the cable on the one hand and enhances the flame retardant performance on the other hand by arranging closely arranged reinforcement members; at the same time, the reinforcement members are limited by the flame retardant layer to ensure the stability of the reinforcement member layout; that is, the overall compression resistance and flame retardant performance are guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] In the figure: 1 wire core, 2 shielding layer, 3 insulation layer, 4 inner sheath layer, 5 buffer, 6 flame retardant layer, 7 arc portion, 8 reinforcement, 9 waterproof layer, 10 outer sheath layer. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0014] like Figure 1 As shown, a low-smoke halogen-free flame-retardant cable for rail transit includes a wire core 1, a shielding layer 2 is provided on the outside of the wire core, an insulating layer 3 is provided on the outside of the shielding layer, the wire core, the shielding layer and the insulating layer form a cable core group, and the cable core group is provided with two groups, which are arranged in close contact, inner sheath layers 4 are provided on the outside of the two groups of cable core groups, a buffer 5 is provided between the inner sheath layer and the cable core group, a flame retardant layer 6 is provided on the outside of the inner sheath layer, a plurality of reinforcement members 8 arranged circumferentially in sequence are provided on the outside of the flame retardant layer, a waterproof layer 9 is provided on the outside of the reinforcement member, and an outer sheath layer 10 is provided on the outside of the waterproof layer.

[0015] Furthermore, the outer side of the flame retardant layer is provided with a plurality of arc-shaped portions 7, and the arc-shaped portions correspond to the reinforcements one by one. Adjacent reinforcements are in conflict with each other. The reinforcements include a metal outer layer, and the metal outer layer is filled with a flame retardant filler. The metal outer layer is a metal that is not combustible under conventional regulation. The inner sheath layer can be made of an environmentally friendly halogen-free, low-smoke, flame-retardant, and oxygen-isolating material, and the outer sheath can be made of polyolefin, which also ensures low smoke and halogen-free.

[0016] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A low-smoke, halogen-free, flame-retardant cable for rail transit, characterized by: It includes a wire core, a shielding layer is arranged on the outside of the wire core, an insulating layer is arranged on the outside of the shielding layer, the wire core, the shielding layer and the insulating layer form a cable core group, there are two groups of cable core groups, which are arranged in close contact, inner sheath layers are arranged on the outside of the two groups of cable core groups, a buffer is arranged between the inner sheath layer and the cable core group, a flame retardant layer is arranged on the outside of the inner sheath layer, a plurality of reinforcing members arranged circumferentially in sequence are arranged on the outside of the flame retardant layer, a waterproof layer is arranged on the outside of the reinforcing member, and an outer sheath layer is arranged on the outside of the waterproof layer.

2. The low-smoke halogen-free flame-retardant cable for rail transit according to claim 1, characterized in that: The outer side surface of the flame retardant layer is provided with a plurality of arc-shaped portions, and the arc-shaped portions correspond to the reinforcing members one by one.

3. The low-smoke halogen-free flame-retardant cable for rail transit according to claim 2, characterized in that: Adjacent reinforcement members interfere with each other.

4. The low-smoke halogen-free flame-retardant cable for rail transit according to claim 3, characterized in that: The reinforcement comprises a metal outer layer, and the metal outer layer is filled with a flame retardant filler.

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