High flame retardant aluminum alloy cable

Abstract

The utility model discloses a kind of high flame-retardant aluminium alloy cables, including multiple cable conductors, the cable conductor is aluminium alloy conductor, the cable conductor is located in wire core cavity, the cable conductor is equipped with insulating layer, fire resistance layer and shielding layer in sequence outside, the wire core cavity outside is equipped with flame-retardant sheath layer, armoring layer, waterproof layer and outer sheath from inside to outside in sequence, the flame-retardant sheath layer includes oxygen barrier layer and flame-retardant layer arranged in sequence outside the wire core cavity.Long service life, good fire resistance, less smoke and harmful substances when burning in fire, in line with environmental protection concept.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, specifically to a high flame-retardant aluminum alloy cable. Background Technology

[0002] As is well known, a cable is a device used to transmit electrical signals or electrical energy, typically consisting of one or more insulated conductors and one or more insulating layers. Cables can be used to connect different equipment or systems, such as power systems, communication systems, and computer networks. The type and specifications of cables depend on specific application requirements; common cables include power cables, communication cables, and control cables. The conductors of cables are usually made of metallic materials, such as copper and aluminum, which provide good electrical conductivity. Cables bear the responsibility of transmitting energy and operate with a certain temperature. If this temperature exceeds their tolerable range, it will lead to ignition or combustion. Furthermore, cables are often laid in bundles; the denser the buildings and the more concentrated the population, the denser the cable laying, resulting in a greater potential fire threat. The potential threat and serious consequences of cable fires have deepened people's understanding of the importance of preventing cable fires and stopping their spread. People have begun to summarize the lessons learned from cable fires and take measures to actively prevent their occurrence and slow their spread, thereby reducing the losses caused by fires. Therefore, flame-retardant cables are widely used in many engineering projects.

[0003] Currently, traditional high flame-retardant cables are generally made using flame-retardant insulation and sheathing materials. While they offer some flame-retardant properties, prolonged operation can lead to high temperatures and even wire fires. These fires are difficult to extinguish, significantly reducing their safety and compromising their usability. Therefore, it is necessary to modify traditional high flame-retardant cables to effectively prevent overheating and fires after extended operation. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the existing technology and provide a high flame retardant aluminum alloy cable with long service life, good fire resistance, and less smoke and harmful substances produced when it is burned, which is in line with the concept of environmental protection.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: a high flame-retardant aluminum alloy cable, comprising multiple cable conductors, wherein the cable conductors are aluminum alloy conductors, the cable conductors are located inside the core cavity, and an insulation layer, a fire-resistant layer and a shielding layer are sequentially provided outside the cable conductors. A flame-retardant sheath layer, an armor layer, a waterproof layer and an outer sheath are sequentially provided outside the core cavity from the inside to the outside. The flame-retardant sheath layer includes an oxygen barrier layer and a flame-retardant layer sequentially disposed outside the core cavity.

[0006] Furthermore, the inner layer of the shielding layer is made of loosely wound copper strip with a thickness of ≥0.05mm and a coverage of ≥80%, while the outer layer is made of 0.2mm aluminum alloy wire with a coverage of ≥90%.

[0007] Furthermore, the insulating layer is made of cross-linked polyolefin, and nano-sized magnesium hydroxide is added thereto.

[0008] Furthermore, the core cavity is filled with refractory material, which is ceramicized fireproof putty.

[0009] Furthermore, the material of the oxygen barrier layer is refractory mortar.

[0010] Furthermore, the flame-retardant layer is formed by wrapping a low-smoke, halogen-free flame-retardant tape around the flame.

[0011] Furthermore, the refractory layer is formed by wrapping two layers of synthetic mica tape, with a thickness ≥0.15mm / layer and a wrapping overlap rate ≥50%.

[0012] Furthermore, the armor layer is an aluminum alloy interlocking armor with a thickness ≥0.2mm and a bending radius ≤12 times the cable outer diameter.

[0013] Furthermore, the waterproof layer is a water-blocking strip.

[0014] Furthermore, the outer sheath is made of LSZH low-smoke halogen-free material, and UV stabilizers and antimony trioxide synergistic flame retardants are added.

[0015] By adopting the above technical solution, this utility model has the following beneficial effects: An insulation layer is provided outside the cable conductor. The insulation layer is made of cross-linked polyolefin, and nano-grade magnesium hydroxide is added to it to improve flame retardancy and reduce the impact on mechanical properties; the fire-resistant layer is made of double-layer synthetic mica tape, which has excellent high-temperature resistance and flame retardancy, and basically does not release harmful fumes when exposed to open flame; the core cavity is filled with fire-resistant material, further improving the fire resistance of the cable; the flame-retardant layer is made of low-smoke halogen-free flame-retardant tape, the base material is low-smoke halogen-free flame-retardant polyolefin, and flame-retardant material, magnesium hydroxide, is filled in it. When heated, magnesium hydroxide decomposes and absorbs heat from the surface of the burning material. The cable provides flame retardancy. The oxygen barrier layer is made of refractory mortar. When the flame retardant material in the flame retardant layer releases a large amount of moisture upon heating, the refractory mortar hardens through ceramic bonding under the influence of water and high temperature, thus preventing oxygen from entering the cable and providing flame retardancy. The armor layer is made of interlocking aluminum alloy with a thickness ≥0.2mm and a bending radius ≤12 times the cable's outer diameter. Its corrosion resistance is superior to steel tape, and flame-retardant fiberglass tape is filled in the armor gaps to prevent flame penetration. The waterproof layer allows the cable to be used in rainy weather or rainy areas while effectively reducing moisture and water entering the cable. The outer sheath uses LSZH low-smoke halogen-free material, with added UV stabilizers and antimony trioxide (Sb2O3) synergistic flame retardants to further improve the flame retardant effect. Attached Figure Description

[0016] Figure 1 This is a radial cross-sectional view of the fire-resistant cable of this utility model.

[0017] Reference numerals: 1. Cable conductor; 2. Insulation layer; 3. Fire-resistant layer; 4. Shielding layer; 5. Core cavity;

[0018] 6. Flame-retardant sheath layer; 7. Armor layer; 8. Waterproof layer; 9. Outer sheath; 61. Oxygen barrier layer; 62. Flame-retardant layer. Detailed Implementation

[0019] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0020] like Figure 1 As shown, in this embodiment, a high flame-retardant aluminum alloy cable is provided, including multiple cable conductors 1. The cable conductors 1 are aluminum alloy conductors and are located inside the core cavity 5. The cable conductors 1 are provided with an insulation layer 2, a fire-resistant layer 3, and a shielding layer 4 in sequence outside the cable conductors 1. The core cavity 5 is provided with a flame-retardant sheath layer 6, an armor layer 7, a waterproof layer 8, and an outer sheath 9 in sequence from the inside to the outside. The flame-retardant sheath layer 6 includes an oxygen barrier layer 61 and a flame-retardant layer 62 in sequence disposed outside the core cavity 5.

[0021] In this embodiment, the cable conductor 1 is made of AA8000 series aluminum alloy and adopts a layered stranded structure to improve creep resistance and bending performance. At the same time, an anti-oxidation layer is coated on the surface of the cable conductor 1 to enhance corrosion resistance.

[0022] In this embodiment, the insulating layer 2 is made of cross-linked polyolefin, and nano-sized magnesium hydroxide is added thereto to improve flame retardancy and reduce the impact on mechanical properties.

[0023] like Figure 1 As shown, in this embodiment, the fire-resistant layer 3 is made of double-layer synthetic mica tape with a thickness of ≥0.15mm / layer and a wrapping overlap rate of ≥50%. The synthetic mica tape has excellent high-temperature resistance and fire resistance, and there is basically no volatilization of harmful smoke when it is exposed to open flame.

[0024] like Figure 1 As shown, in this embodiment, the inner layer of the shielding layer 4 is made of loosely wound copper strip with a thickness of ≥0.05mm and a coverage of ≥80%, while the outer layer is made of 0.2mm aluminum alloy wire with a coverage of ≥90%, thus taking into account the synergistic effect of electromagnetic shielding and flame retardancy.

[0025] like Figure 1 As shown, in this embodiment, the core cavity 5 is filled with refractory material. The refractory material is ceramicized fireproof mud, which expands at high temperature to form a heat insulation barrier, further improving the fire resistance of the cable.

[0026] like Figure 1 As shown, in this embodiment, the flame-retardant layer 62 is formed by wrapping a low-smoke halogen-free flame-retardant tape. The substrate is a low-smoke halogen-free flame-retardant polyolefin, which is filled with a flame-retardant material, namely magnesium hydroxide. When heated, magnesium hydroxide decomposes and absorbs heat from the surface of the burning material, thus achieving a flame-retardant effect. At the same time, it releases a large amount of water to dilute the oxygen on the surface of the burning material. The active magnesium oxide generated by the decomposition adheres to the surface of the combustible material, further preventing combustion. During the entire flame-retardant process, magnesium hydroxide not only does not produce any harmful substances, but its decomposition products can also absorb a large amount of harmful gases and smoke produced by the combustion of polymers such as rubber and plastics while providing flame retardancy. The active magnesium oxide continuously absorbs the incompletely burned molten residue, thereby quickly stopping combustion while eliminating smoke and preventing dripping.

[0027] like Figure 1 As shown, in this embodiment, the material of the oxygen barrier layer 61 is refractory mortar. When the flame retardant material in the flame retardant layer 62 releases a large amount of water when heated, the refractory mortar hardens through ceramic bonding under the action of water and high temperature, thereby isolating oxygen from entering the cable and playing a flame retardant role.

[0028] like Figure 1As shown, in this embodiment, the armor layer 7 is an aluminum alloy interlocking armor with a thickness ≥ 0.2 mm, a bending radius ≤ 12 times the cable outer diameter, and better corrosion resistance than steel tape. Flame-retardant fiberglass tape is filled in the gaps between the armor layers to prevent flame penetration.

[0029] like Figure 1 As shown, in this embodiment, the waterproof layer 8 is a water-blocking strip. The waterproof layer 8 enables the cable to be used in rainy weather or rainy areas, increasing the application range and application area of ​​the cable, while effectively reducing the entry of moisture and water into the cable.

[0030] like Figure 1 As shown, in this embodiment, the outer sheath 9 is made of LSZH low-smoke halogen-free material, with added UV stabilizer and antimony trioxide (Sb2O3) as a synergistic flame retardant.

[0031] This utility model has the following beneficial effects: The cable conductor 1 is surrounded by an insulation layer 2, which is made of cross-linked polyolefin with added nano-grade magnesium hydroxide to enhance flame retardancy and reduce the impact on mechanical properties; the fire-resistant layer 3 is made of double-layer synthetic mica tape, which has excellent high-temperature resistance and flame retardancy, and virtually no harmful smoke volatilization when exposed to open flame; the core cavity 5 is filled with fire-resistant material to further improve the cable's fire resistance; the flame-retardant layer 62 is made of low-smoke halogen-free flame-retardant tape, with a base material of low-smoke halogen-free flame-retardant polyolefin, filled with flame-retardant material, namely magnesium hydroxide. When heated, magnesium hydroxide decomposes and absorbs heat from the surface of the burning material, thus playing a flame-retardant role. The oxygen barrier layer 61 is made of refractory mortar. When the flame-retardant material in the flame-retardant layer 62 releases a large amount of moisture when heated, the refractory mortar hardens through ceramic bonding under the action of water and high temperature, thereby isolating oxygen from entering the cable and playing a flame-retardant role. The armor layer 7 is an aluminum alloy interlocking armor with a thickness ≥0.2mm and a bending radius ≤12 times the cable outer diameter. Its corrosion resistance is better than that of steel tape, and flame-retardant fiberglass tape is filled in the gaps between the armor layers to prevent flame penetration. The waterproof layer 8 enables the cable to be used in rainy weather or rainy areas, while effectively reducing the entry of moisture and water into the cable. The outer sheath 9 uses LSZH low-smoke halogen-free material, with added UV stabilizers and antimony trioxide (Sb2O3) synergistic flame retardants to further improve the flame-retardant effect.

[0032] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high flame-retardant aluminum alloy cable, comprising multiple cable conductors (1), characterized in that: The cable conductor (1) is an aluminum alloy conductor. The cable conductor (1) is located inside the core cavity (5). The cable conductor (1) is provided with an insulation layer (2), a fire-resistant layer (3) and a shielding layer (4) in sequence. The core cavity (5) is provided with a flame-retardant sheath layer (6), an armor layer (7), a waterproof layer (8) and an outer sheath (9) in sequence from the inside to the outside. The flame-retardant sheath layer (6) includes an oxygen barrier layer (61) and a flame-retardant layer (62) in sequence on the outside of the core cavity (5).

2. The high flame-retardant aluminum alloy cable according to claim 1, characterized in that: The inner layer of the shielding layer (4) is made of loosely wound copper strip with a thickness of ≥0.05mm and a coverage of ≥80%, while the outer layer is made of 0.2mm aluminum alloy wire with a coverage of ≥90%.

3. The high flame-retardant aluminum alloy cable according to claim 1, characterized in that: The core cavity (5) is filled with refractory material, which is ceramic fireproof mud.

4. The high flame-retardant aluminum alloy cable according to claim 1, characterized in that: The oxygen barrier layer (61) is made of refractory mortar.

5. The high flame-retardant aluminum alloy cable according to claim 1, characterized in that: The flame retardant layer (62) is formed by wrapping a low-smoke halogen-free flame retardant tape.

6. The high flame-retardant aluminum alloy cable according to claim 1, characterized in that: The fire-resistant layer (3) is made of double-layer synthetic mica tape wrapped with a thickness of ≥0.15mm / layer and a wrapping overlap rate of ≥50%.

7. The high flame-retardant aluminum alloy cable according to claim 1, characterized in that: The armor layer (7) is an aluminum alloy interlocking armor with a thickness ≥ 0.2 mm and a bending radius ≤ 12 times the outer diameter of the cable.

8. The high flame-retardant aluminum alloy cable according to claim 1, characterized in that: The waterproof layer (8) is a water-blocking strip.

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