Aluminium sheathed flexible fire resistant cable

Abstract

The utility model discloses an aluminium sheath ring note super-soft fireproof cable, including by inside to outside setting successively: super-soft conductor layer: by the soft copper wire of multiple diameter 0.2mm layered stranding is formed, and the stranding pitch ratio is 8 12 times, mica wrap layer: by at least two synthetic mica tape overlapping wrap composition constitutes, and the lap joint rate is 30%, adopt the stranding conductor of multiple thin copper wire (0.2mm) and spiral ring note aluminium sheath design, make cable minimum bending radius 5 times outer diameter, dynamic bending life is long, be applicable to narrow space or frequently moving scene, mica wrap layer + ceramic silicon rubber filling layer double fire -resistant structure, can maintain 3 hours insulation performance in 950C flame, far more than ordinary cable, aluminium sheath replaces traditional steel armor, weight loss, annular groove design improves compressive strength, central aramid fiber tensile core enhances longitudinal bearing capacity, sheath ring note groove increases heat dissipation surface area, temperature rise reduces, aluminium armor surface coats corrosion -resistant coating, is applicable to humid, chemical and other severe environment.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, specifically to an aluminum-sheathed, ring-patterned, ultra-flexible fireproof cable with high flexibility, fire resistance, and mechanical protection. Background Technology

[0002] Traditional fire-resistant cables have shortcomings in flexibility, compressive strength, and fire resistance. For example: 1. Ordinary cables are mostly covered with PVC or rubber sheaths, which have poor fire resistance and are prone to deformation or combustion at high temperatures.

[0003] 2. The armor layer is mostly made of steel strip structure, which enhances mechanical strength, but results in poor cable flexibility and makes it difficult to bend and lay.

[0004] 3. Existing fire-resistant cables mostly rely on mica tape wrapping for insulation, but long-term bending can easily cause cracking, affecting fire resistance.

[0005] 4. The surface of the sheath is mostly smooth, which makes it insufficient for pressure and torsion resistance.

[0006] Therefore, there is an urgent need for a cable structure that is ultra-flexible, fireproof, pressure-resistant, and easy to lay. Utility Model Content

[0007] In order to overcome the shortcomings of the existing technology, one of the objectives of this utility model is to provide an aluminum sheathed ring-patterned ultra-flexible fireproof cable.

[0008] One of the objectives of this utility model is achieved through the following technical solution: An aluminum-sheathed, ring-patterned, ultra-flexible fireproof cable includes, from the inside out: an ultra-flexible conductor layer composed of multiple strands of soft copper wire with a diameter ≤0.2mm twisted together in layers, with a twisting pitch ratio of 8-12 times; Silicone rubber insulation layer: extruded onto the outside of the conductor layer, with a thickness of 0.8-1.2 mm and a temperature resistance rating of ≥180℃; Mica wrapping layer: Consists of at least two layers of synthetic mica tape overlapping and wrapping, with an overlap rate of ≥30%; Flame-retardant filler layer: Filled in the gaps between the cable cores, using ceramicized silicone rubber material, which can form a ceramicized protective layer at high temperatures; Inner sheath: Low-smoke halogen-free flame-retardant polyolefin material, thickness 1.0-1.5mm, oxygen index ≥35; Aluminum armor layer: longitudinally overlapping aluminum strip structure, overlap rate ≥15%, thickness 0.1-0.3mm; Ring-patterned aluminum outer sleeve: Extruded aluminum alloy material with continuous ring-patterned grooves on its outer surface.

[0009] Furthermore, the annular groove is a continuous spiral structure with a groove depth of 0.3-0.8 mm and a spacing of 3-8 mm between adjacent grooves; the spiral pitch (P) and the cable outer diameter (D) satisfy the following relationship: 1 ≤ P / D ≤ 1.8.

[0010] Furthermore, the ultra-flexible conductor layer has a tensile reinforcing core at its center, which is an aramid fiber bundle or a glass fiber bundle, with a cross-sectional area accounting for 5-10% of the conductor layer.

[0011] Furthermore, the aluminum strip surface of the aluminum armor layer is coated with a corrosion-resistant coating, the coating composition being zinc-aluminum alloy or epoxy resin, with a thickness of 10-30μm.

[0012] Furthermore, the ceramicized silicone rubber of the flame-retardant filler layer comprises the following components: Base rubber: Methyl vinyl silicone rubber, 40-60 wt%; Ceramic filler: Composite mineral powder with SiO2 content ≥ 40%, 30-50 wt%; Flame retardant: A compound of aluminum hydroxide and zinc borate, 10-20 wt%.

[0013] Furthermore, the cross-section of the annular groove is trapezoidal, and the ratio of the groove bottom width (W1) to the groove opening width (W2) satisfies: 0.6 ≤ W1 / W2 ≤ 0.9, and the groove wall inclination angle α is 15°-45°.

[0014] Furthermore, the cable meets the following performance specifications: Minimum dynamic bending radius ≤ 5 times the cable outer diameter; Passed the 950℃ / 3h fire resistance test specified in IEC 60331-1 standard; Compressive strength ≥1500N / 10cm (GB / T 2951.31).

[0015] Furthermore, the annular groove of the annular aluminum outer sheath occupies 15-25% of the sheath surface area, and the groove area is covered with a flame-retardant coating, the coating material being an intumescent fire-retardant paint.

[0016] Furthermore, the surface of the synthetic mica tape with mica wrapping is coated with silica aerogel felt, the aerogel felt being 0.05-0.2 mm thick and having a thermal conductivity ≤0.02 W / (m·K).

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The cable adopts a multi-strand fine copper wire stranded conductor (≤0.2mm) and a spiral annular aluminum sheath design, which makes the minimum bending radius of the cable ≤5 times the outer diameter and the dynamic bending life ≥ long, making it suitable for confined spaces or frequent movement scenarios.

[0018] 2. The dual fire-resistant structure of mica wrapping layer + ceramicized silicone rubber filler layer can maintain insulation performance for 3 hours in a 950℃ flame, far exceeding that of ordinary cables (usually only 1 hour).

[0019] 3. The aluminum sheath replaces the traditional steel armor, reducing weight. The annular groove design improves compressive strength, and the central aramid fiber tensile core enhances longitudinal load-bearing capacity.

[0020] 4. The annular grooves on the sheath increase the heat dissipation surface area, reducing temperature rise; the aluminum armor surface is coated with a corrosion-resistant coating, making it suitable for harsh environments such as humid and chemical environments.

[0021] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0022] Fig. 1 This is a schematic diagram of the structure of this embodiment; Fig. 2 This is a schematic diagram of the continuous annular groove structure of the component in this embodiment.

[0023] In the figure: 101, super-flexible conductor layer; 1011, tensile reinforcing core; 102, silicone rubber insulation layer; 103, mica wrapping layer; 104, flame-retardant filler layer; 105, inner sheath; 106, aluminum armor layer; 107, annular aluminum outer sheath; 1071, continuous annular groove. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0025] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] Please see Figs. 1-2 The aluminum sheathed annular ultra-flexible fireproof cable of this embodiment includes, from the inside out, the following: ultra-flexible conductor layer 101: composed of multiple strands of soft copper wire with a diameter ≤0.2mm twisted together in layers, with a twisting pitch ratio of 8-12 times; Silicone rubber insulation layer 102: extruded onto the outside of the conductor layer, with a thickness of 0.8-1.2 mm and a temperature resistance rating of ≥180℃; Mica wrapping layer 103: Composed of at least two layers of synthetic mica tape overlapping and wrapping, with an overlap rate of ≥30%; Flame-retardant filler layer 104: Fills the gap between the cable cores, using ceramicized silicone rubber material, which can form a ceramicized protective layer at high temperatures; Inner sheath 105: Low smoke halogen-free flame retardant polyolefin material, thickness 1.0-1.5mm, oxygen index ≥35; Aluminum armor layer 106: longitudinally overlapping aluminum strip structure, overlap rate ≥15%, thickness 0.1-0.3mm; 107 ring-patterned aluminum outer sheath: made of aluminum alloy material by extrusion, with continuous annular grooves 1071 on its outer surface.

[0028] The annular groove 1071 has a continuous spiral structure with a groove depth of 0.3-0.8mm and a spacing of 3-8mm between adjacent grooves. The spiral pitch (P) and the cable outer diameter (D) satisfy the following relationship: 1 ≤ P / D ≤ 1.8.

[0029] The ultra-flexible conductor layer 101 has a tensile reinforcing core 1011 at its center. The reinforcing core is an aramid fiber bundle or a glass fiber bundle, and its cross-sectional area accounts for 5-10% of the conductor layer.

[0030] The aluminum strip of the aluminum armor layer 106 is coated with a corrosion-resistant coating, which is composed of zinc-aluminum alloy or epoxy resin and has a thickness of 10-30μm.

[0031] The ceramicized silicone rubber of the flame-retardant filler layer 104 comprises the following components: Base rubber: Methyl vinyl silicone rubber, 40-60 wt%; Ceramic filler: Composite mineral powder with SiO2 content ≥ 40%, 30-50 wt%; Flame retardant: A compound of aluminum hydroxide and zinc borate, 10-20 wt%.

[0032] The cross-section of the annular groove 1071 is trapezoidal, and the ratio of the bottom width (W1) to the opening width (W2) satisfies: 0.6≤W1 / W2≤0.9, and the inclination angle α of the groove wall is 15°-45°.

[0033] The cable meets the following performance specifications: Minimum dynamic bending radius ≤ 5 times the cable outer diameter; Passed the 950℃ / 3h fire resistance test specified in IEC 60331-1 standard; Compressive strength ≥1500N / 10cm (GB / T 2951.31).

[0034] The annular groove 1071 of the annular aluminum outer sheath 107 accounts for 15-25% of the surface area of ​​the sheath. The groove area is covered with a flame-retardant coating. The coating material is an intumescent fireproof coating. The surface of the synthetic mica tape of the mica wrapping layer 103 is composited with silica aerogel felt. The aerogel felt has a thickness of 0.05-0.2 mm and a thermal conductivity of ≤0.02 W / (m·K).

[0035] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. An aluminum-sheathed, ring-patterned, ultra-flexible fire-resistant cable, characterized in that, It includes, from the inside out, the following: an ultra-flexible conductor layer (101): composed of multiple strands of soft copper wire with a diameter ≤0.2mm twisted together in layers, with a twisting pitch ratio of 8-12 times; Silicone rubber insulation layer (102): Extruded onto the outside of the conductor layer, with a thickness of 0.8-1.2 mm and a temperature resistance rating of ≥180℃; Mica wrapping layer (103): Consists of at least two layers of synthetic mica tape overlapping and wrapping, with an overlap rate ≥30%; Flame-retardant filler layer (104): Filled in the gap between the cable cores, using ceramicized silicone rubber material, which can form a ceramicized protective layer at high temperatures; Inner sheath (105): Low smoke halogen-free flame retardant polyolefin material, thickness 1.0-1.5mm, oxygen index ≥35; Aluminum armor layer (106): longitudinally overlapping aluminum strip structure, overlap rate ≥15%, thickness 0.1-0.3mm; Annular aluminum outer sheath (107): made of aluminum alloy material by extrusion, with continuous annular grooves (1071) on its outer surface.

2. The aluminum-sheathed, ring-patterned, ultra-flexible fire-resistant cable according to claim 1, characterized in that: The annular groove (1071) has a continuous spiral structure with a groove depth of 0.3-0.8 mm and a spacing of 3-8 mm between adjacent grooves. The spiral pitch P and the outer diameter D of the cable satisfy the following relationship: 1 ≤ P / D ≤ 1.

8.

3. The aluminum-sheathed, ring-patterned, ultra-flexible fire-resistant cable according to claim 1, characterized in that: The ultra-flexible conductor layer (101) has a tensile reinforcing core (1011) at its center. The reinforcing core is an aramid fiber bundle or a glass fiber bundle, and its cross-sectional area accounts for 5-10% of the conductor layer.

4. The aluminum-sheathed, ring-patterned, ultra-flexible fire-resistant cable according to claim 1, characterized in that: The aluminum strip surface of the aluminum armor layer (106) is coated with a corrosion-resistant coating, the coating composition being zinc-aluminum alloy or epoxy resin, with a thickness of 10-30μm.

5. The aluminum-sheathed, ring-patterned, ultra-flexible fire-resistant cable according to claim 1, characterized in that: The cross-section of the annular groove (1071) is trapezoidal, and the ratio of the bottom width W1 to the opening width W2 satisfies: 0.6 ≤ W1 / W2 ≤ 0.9, and the inclination angle α of the groove wall is 15°-45°.

6. The aluminum-sheathed, ring-patterned, ultra-flexible fire-resistant cable according to claim 1, characterized in that: The annular groove (1071) of the annular aluminum outer sheath (107) accounts for 15-25% of the surface area of ​​the sheath, and the groove area is covered with a flame-retardant coating, the coating material being an intumescent fireproof coating.

7. The aluminum-sheathed, ring-patterned, ultra-flexible fire-resistant cable according to claim 1, characterized in that: The surface of the synthetic mica tape of the mica wrapping layer (103) is coated with silica aerogel felt, the thickness of which is 0.05-0.2 mm and the thermal conductivity is ≤0.02 W / (m·K).

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