Halogen-free flame-retardant cable

Abstract

This utility model relates to the field of cable technology and discloses a halogen-free flame-retardant cable, comprising multiple cable cores. A heat-insulating reinforcing layer is connected to the outer surface of each cable core. A filler material layer is disposed between the heat-insulating reinforcing layer and the multiple cable cores. The heat-insulating reinforcing layer, from the inside out, comprises a first aerogel heat-insulating layer, an aluminum wire armor layer, and a second aerogel heat-insulating layer. A halogen-free outer sheath is disposed on the outer surface of the heat-insulating reinforcing layer, and several wear-resistant protrusions are evenly arranged on the outer surface of the halogen-free outer sheath. In this utility model, through the setting of the heat-insulating reinforcing layer, which consists of two layers of aerogel material and one armor layer, the aerogel material has excellent flame-retardant and heat-insulating properties. Only a thin layer is needed to achieve good flame-retardant and heat-insulating effects, reducing the thickness of the flame-retardant material. Simultaneously, the use of tightly wound aluminum wire as the armor layer makes it lighter and more flexible than ordinary steel tape armor.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, and in particular to halogen-free flame-retardant cables. Background Technology

[0002] Halogen-free flame-retardant cables refer to cables whose insulation material is a halogen substance. When burning, it does not release halogen-containing gases and has a low smoke concentration. The structure of commonly used low-smoke halogen-free flame-retardant cables is generally as follows: the gaps between multiple insulated conductors are filled with glass fiber to form a cable core. The cable core is then wrapped with glass fiber tape wrapping, halogen-free low-smoke polyolefin oxygen barrier extrusion layer, and low-smoke halogen-free polyolefin sheath extrusion layer from the inside out to achieve the flame-retardant effect.

[0003] However, this method requires the outer surface of the cable core to be wrapped with a thicker layer of flame-retardant and heat-insulating material, which reduces the cable's flexibility and increases the overall weight. Therefore, a new halogen-free flame-retardant cable is proposed to solve the above problems. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a halogen-free flame-retardant cable.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a halogen-free flame-retardant cable, comprising multiple cable cores, the outer surfaces of the multiple cable cores being connected to a heat-insulating reinforcing layer, a filling material layer being disposed between the heat-insulating reinforcing layer and the multiple cable cores, the heat-insulating reinforcing layer comprising, from the inside out, a first aerogel heat-insulating layer, an aluminum wire armor layer and a second aerogel heat-insulating layer, the outer surface of the heat-insulating reinforcing layer being provided with a halogen-free outer sheath, and the outer surface of the halogen-free outer sheath being provided with a plurality of wear-resistant protrusions arranged at equal intervals.

[0006] As a further description of the above technical solution:

[0007] Each of the multiple cable cores includes a conductor, and the outer surface of the conductor is sequentially provided with a protective inner sheath, a metal shielding layer and a protective outer sheath, with the metal shielding layer located between the protective inner sheath and the protective outer sheath.

[0008] As a further description of the above technical solution:

[0009] Both the first aerogel insulation layer and the second aerogel insulation layer include a PET material layer and an aerogel film.

[0010] As a further description of the above technical solution:

[0011] The halogen-free outer sheath is made of a low-smoke halogen-free flame-retardant polyolefin material layer that meets the B1 flame-retardant requirements.

[0012] As a further description of the above technical solution:

[0013] A fluorescent marking layer is provided between any two wear-resistant protrusions.

[0014] This utility model has the following beneficial effects:

[0015] In this invention, a heat insulation reinforcement layer is provided, which consists of two layers of aerogel material and one armor layer. The aerogel material has excellent flame retardant and heat insulation properties, and only a thin layer is needed to achieve good flame retardant and heat insulation effects, thus reducing the thickness of the flame retardant material. At the same time, a tightly wound aluminum wire is used as the armor layer, which is lighter and more flexible than ordinary steel tape armor. Combined with the wear-resistant ridges, it has good wear resistance, preventing excessive damage to the cable when dragged on the ground. It also increases friction, making the cable easier to install. Attached Figure Description

[0016] Figure 1 This is a perspective view of the halogen-free flame-retardant cable proposed in this utility model.

[0017] Figure 2 This is an overall cross-sectional view of the halogen-free flame-retardant cable proposed in this utility model;

[0018] Figure 3 This is a cross-sectional view of the cable core in the halogen-free flame-retardant cable proposed in this utility model.

[0019] Legend:

[0020] 1. Cable core; 101. Conductor; 102. Inner protective sheath; 103. Metallic shielding layer; 104. Outer protective sheath; 2. Thermal insulation reinforcement layer; 201. First aerogel thermal insulation layer; 202. Aluminum wire armor layer; 203. Second aerogel thermal insulation layer; 3. Filler material; 4. Halogen-free outer sheath; 5. Wear-resistant ridges; 6. Fluorescent marking layer. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example:

[0023] Reference Figures 1-3This utility model provides an embodiment of a halogen-free flame-retardant cable, comprising multiple cable cores 1. A heat-insulating reinforcing layer 2 is connected to the outer surface of each cable core 1. A filling material layer 3 is provided between the heat-insulating reinforcing layer 2 and the multiple cable cores 1 to fill the gaps between the cable cores 1. The filling material 3 can be commonly used PP rope, polyester tape, tin foil tape, spun yarn, glass fiber, cotton thread, hemp rope, etc. The heat-insulating reinforcing layer 2, from the inside out, includes a first aerogel heat-insulating layer 201, an aluminum wire armor layer 202, and a second aerogel heat-insulating layer 203. Both the first aerogel heat-insulating layer 201 and the second aerogel heat-insulating layer 203 include a PET material layer and an aerogel film. Aerogel is a high-quality, high-efficiency heat-insulating material with extremely high porosity, which can effectively reduce the solid-phase heat of the material. Conductive properties effectively suppress gas-phase heat transfer. The PET material layer serves as the carrier medium for the aerogel film, with a coating thickness of 120-180μm, giving the aerogel insulation layer excellent heat insulation and fireproofing functions. It is extremely lightweight and thin, so it does not affect the cable's flexibility. The aluminum wire armor layer 202 is formed by tightly winding multiple arranged aluminum wires. The aluminum wire is lightweight and flexible, facilitating the bending of the halogen-free flame-retardant cable. It also prevents rodents and insects from gnawing on it, ensuring no impact on power transmission and shielding against electromagnetic interference. The double-layer aerogel insulation layer design ensures that even if rodents or insects gnaw on the first aerogel insulation layer, the second aerogel insulation layer 203 can still provide excellent flame retardancy and fireproofing thanks to the aluminum wire armor layer 202.

[0024] The outer surface of the heat insulation reinforcement layer 2 is provided with a halogen-free outer sheath 4. The halogen-free outer sheath 4 is made of low-smoke halogen-free flame-retardant polyolefin material that meets the B1 flame retardant requirements. It effectively prevents oxygen from acting as a combustion accelerant to continuously burn the cable, thus achieving a good flame retardant effect. Several wear-resistant ridges 5 are evenly arranged on the outer surface of the halogen-free outer sheath 4. The wear-resistant ridges 5 are made of the same material as the halogen-free outer sheath 4 and are integrally extruded by an extruder. When the cable is dragged, the wear-resistant ridges 5 on the outer surface of the cable come into contact with the ground first. Only when all the wear-resistant ridges 5 are worn can the halogen-free outer sheath 4 be damaged, which greatly improves the overall wear resistance of the cable.

[0025] Each of the multiple cable cores 1 includes a conductor 101. The outer surface of the conductor 101 is sequentially provided with a protective inner sheath 102, a metal shielding layer 103, and a protective outer sheath 104. The metal shielding layer 103 is located between the protective inner sheath 102 and the protective outer sheath 104, which facilitates the protection of the conductor 101.

[0026] A fluorescent marking layer 6 is provided between any two wear-resistant protrusions 5, which can make the cable position visible at night, making it more convenient during power emergency repairs. At the same time, in conjunction with the wear-resistant protrusions 5, the fluorescent marking layer 6 will not be worn when the cable is dragged on the ground.

[0027] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A halogen-free flame-retardant cable, comprising multiple cable cores (1), characterized in that: The outer surfaces of multiple cable cores (1) are connected to a heat insulation reinforcement layer (2). A filling material layer (3) is provided between the heat insulation reinforcement layer (2) and the multiple cable cores (1). The heat insulation reinforcement layer (2) includes a first aerogel heat insulation layer (201), an aluminum wire armor layer (202), and a second aerogel heat insulation layer (203) from the inside to the outside. A halogen-free outer sheath (4) is provided on the outer surface of the heat insulation reinforcement layer (2). Several wear-resistant protrusions (5) are arranged at equal intervals on the outer surface of the halogen-free outer sheath (4).

2. The halogen-free flame-retardant cable according to claim 1, characterized in that: Each of the multiple cable cores (1) includes a conductor (101), and the outer surface of the conductor (101) is provided with a protective inner sheath (102), a metal shielding layer (103) and a protective outer sheath (104) in sequence, with the metal shielding layer (103) located between the protective inner sheath (102) and the protective outer sheath (104).

3. The halogen-free flame-retardant cable according to claim 1, characterized in that: Both the first aerogel insulation layer (201) and the second aerogel insulation layer (203) include a PET material layer and an aerogel membrane.

4. The halogen-free flame-retardant cable according to claim 1, characterized in that: The halogen-free outer sheath (4) is made of a low-smoke halogen-free flame-retardant polyolefin material layer that meets the B1 flame-retardant requirements.

5. The halogen-free flame-retardant cable according to claim 1, characterized in that: A fluorescent marking layer (6) is provided between any two wear-resistant protrusions (5).

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