Indoor tensile butterfly-shaped photoelectric composite cable

Abstract

The utility model relates to an indoor tensile butterfly-shaped photoelectric composite cable, which comprises a loose tube type optical unit and two soft copper conductors symmetrically distributed on the left side and the right side of the loose tube type optical unit, the loose tube type optical unit comprises a PBT loose tube, two or four optical fibers are arranged in the PBT loose tube, and gaps are filled with fiber paste at the same time. The sectional area of each soft copper conductor is 0.5 mm2 to 1.5 mm2, a crosslinked polyethylene insulating layer is extruded outside each soft copper conductor, and the thickness of the crosslinked polyethylene insulating layer is 0.5 mm-0. 6mm. A layer of low-smoke halogen-free flame-retardant polyolefin sheath finished product is extruded outside the optical fiber unit and the insulated soft copper conductors. The cross section of the low-smoke halogen-free flame-retardant polyolefin sheath is butterfly-shaped, and the thickness of the low-smoke halogen-free flame-retardant polyolefin sheath is 0.6-0.7 mm. The photoelectric composite cable integrates the power wire core and the optical unit, the product size is reduced, the tensile property of the photoelectric composite cable is improved, and the service life of the photoelectric composite cable is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of optoelectronic composite cable technology, specifically an indoor tensile-resistant butterfly-shaped optoelectronic composite cable. Background Technology

[0002] In the construction of modern intelligent buildings and data centers, the demand for indoor signal transmission and power supply is increasing. Traditional indoor cabling separates fiber optic unit transmission and electrical performance transmission. This method not only makes the cabling process cumbersome and complex, requiring multiple constructions and repeated debugging, consuming a lot of manpower, material resources and time, but also results in a large number of cables crisscrossing and forming a messy "network", which seriously affects the aesthetics and space utilization of the interior.

[0003] Meanwhile, existing indoor fiber optic units and power cores are arranged separately in parallel without tensile strength components. During installation, they are easily broken by dragging, pulling, and tugging forces, leading to a shortened cable lifespan and increased maintenance costs. Secondly, ordinary PVC sheaths release large amounts of toxic fumes when burned, failing to meet fire safety requirements for high-traffic areas such as computer rooms. Therefore, the development of a structurally sound and high-performance indoor composite cable is urgently needed. Utility Model Content

[0004] To address the aforementioned issues, this utility model provides an indoor tensile-resistant butterfly-shaped optical-optical composite cable that integrates a power core and an optical fiber unit, reducing product size while improving the tensile strength and extending the service life of the optical-optical composite cable.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: an indoor tensile-resistant butterfly-shaped optical-electric composite cable, comprising a loose-tube optical unit and two soft copper conductors symmetrically distributed on the left and right sides of the loose-tube optical unit. The loose-tube optical unit includes a PBT loose tube, and two or four optical fibers are provided inside the PBT loose tube, with the gaps filled by fiber grease. The cross-sectional area of ​​each soft copper conductor is 0.5 mm². 2 ~1.5mm 2 Furthermore, each of the aforementioned soft copper conductors is extruded with a cross-linked polyethylene insulation layer, the thickness of which is 0.5mm-0.6mm. The loose-fitting optical unit and the soft copper conductor with insulation are extruded with a low-smoke halogen-free flame-retardant polyolefin sheath, the cross-section of which is butterfly-shaped and the thickness of which is 0.6mm-0.7mm.

[0006] Preferably, the PBT loose tube is formed by extruding polybutylene terephthalate into a tubular shape, and the outer diameter of the PBT loose tube is 1.7 mm, the wall thickness is 0.28 mm to 0.30 mm, and the excess fiber length inside the PBT loose tube is set to 1.5‰ to 2.0‰.

[0007] Preferably, the soft copper conductor is a type 2 or type 5 stranded soft copper conductor.

[0008] Preferably, a phosphated soft steel wire is symmetrically arranged on the upper and lower sides of the loose-fitting optical unit, and a layer of low-smoke halogen-free flame-retardant polyolefin sheath is extruded on the outside of the loose-fitting optical unit, the insulated soft copper conductor and the phosphated soft steel wire.

[0009] Preferably, the spacing between the soft steel wire and the loose-tube optical unit, and between the loose-tube optical unit and the soft copper conductor, is not less than 0.5 mm.

[0010] Preferably, each of the phosphated soft steel wires is a finished steel wire that has undergone phosphate treatment and is coated with a phosphated mold. The diameter of the phosphated soft steel wire is 0.5 mm, and the tensile strength is not less than 1370 N / mm². 2 The elastic modulus is not less than 1.90×10⁵ N / mm². 2 The weight of the phosphating film is not less than 0.6 g / m. 2 .

[0011] Preferably, the optical fiber is multimode G.651 or single-mode G.652 or single-mode G.657.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. This utility model innovatively integrates power transmission and signal transmission functions. The power cable primarily conducts current, while the optical fiber core mainly serves for monitoring equipment, signal and image transmission, and material control. The composite design of the power core and optical fiber core—that is, the composite design of soft copper conductors and loose-tube optical units—reduces the cable size compared to traditional separate cable combinations. This not only significantly saves indoor wiring space and avoids wiring complexity and chaos, making wiring simpler and neater, but also reduces the complexity and workload of wiring construction, improving construction efficiency. Simultaneously, it saves production costs, bringing users higher cost-effectiveness and a better user experience.

[0014] 2. The soft copper conductor of this invention not only transmits electrical energy but also provides resistance to gravity, vibration, and tension during installation. Furthermore, by incorporating phosphated soft steel wires above and below the loose-tube optical unit, a robust mechanical support system is further constructed, enhancing tensile and vibration resistance on top of the existing structure. Compared to traditional cables, under the same external force conditions, the tensile strain of the internal core of this composite cable is reduced, significantly improving the cable's resistance to damage, extending its service life, and reducing maintenance costs and equipment failure risks caused by cable damage.

[0015] 3. This application of a low-smoke, halogen-free, flame-retardant polyolefin sheath enables the composite cable to exhibit superior fire safety and environmental performance. In combustion tests, its smoke density is significantly lower than that of traditional cables, and the content of toxic gases produced during combustion is virtually zero, effectively protecting the lives and health of personnel in the event of a fire. Furthermore, this material meets environmental standards and does not cause pollution during production, use, or disposal, aligning with the trend of green environmental protection. It is particularly suitable for indoor environments with extremely high safety and environmental requirements, such as computer rooms and high-traffic areas. Attached Figure Description

[0016] Figure 1 This is a top view of the non-phosphated soft steel wire of this utility model;

[0017] Figure 2 This is a top view of the phosphated soft steel wire of this utility model. Detailed Implementation

[0018] The following will combine Figure 1-2 The present invention will be described in detail below. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0019] An indoor tensile-resistant butterfly-shaped optical-electric composite cable includes a loose-tube optical unit 1 and two soft copper conductors 2 symmetrically distributed on the left and right sides of the loose-tube optical unit. The loose-tube optical unit includes a PBT loose tube 1-1, within which two or four optical fibers are simultaneously filled with fiber grease. Specifically, the PBT loose tube is formed by extruding polybutylene terephthalate into a tubular shape, and the loose tube is filled with water-blocking fiber grease. The optical fibers are placed inside the fiber grease, which has the functions of water blocking, lubrication, and protection of the optical fibers. Simultaneously, the PBT loose tube... The tube has an outer diameter of 1.7 mm and a wall thickness of 0.28 mm to 0.30 mm. To ensure the fiber's mobility within the PBT loose tube, the excess fiber length is set to 1.5‰ to 2.0‰. Excessive excess length increases transmission loss and signal attenuation, while insufficient excess length leads to core breakage during bending and increased stress, resulting in further signal attenuation. The fiber can be multimode G.651, single-mode G.652, or single-mode G.657, but is not limited to these types. Each flexible conductor is a Category 2 or Category 5 stranded soft copper conductor with a cross-sectional area of ​​0.5 mm². 2 ~1.5mm 2 Furthermore, each soft copper conductor is extruded with a cross-linked polyethylene insulation layer 3. Specifically, the thickness of the cross-linked polyethylene insulation layer is 0.5mm-0.6mm. At the same time, a low-smoke halogen-free flame-retardant polyolefin sheath 5 is extruded on the outside of the loose-fitting optical unit and the soft copper conductor with insulation. The cross-section of the low-smoke halogen-free flame-retardant polyolefin sheath is butterfly-shaped.

[0020] In another embodiment, a phosphated soft steel wire 4 is symmetrically arranged on the upper and lower sides of the loose-fitting optical unit. The phosphated soft steel wire is a finished steel wire that has undergone phosphate treatment and is coated with a phosphated mold. The phosphated soft steel wire we use has a diameter of 0.5 mm and a tensile strength of not less than 1370 N / mm². 2 The elastic modulus is not less than 1.90×10⁵ N / mm². 2 The weight of the phosphating film is not less than 0.6 g / m. 2 Finally, a low-smoke, halogen-free, flame-retardant polyolefin sheath is extruded over the loose-fitting optical unit, the insulated soft copper conductor, and the phosphated soft steel wire.

[0021] Furthermore, the spacing between the phosphated soft steel wire and the loose-tube optical unit, and between the loose-tube optical unit and the soft copper conductor, shall not be less than 0.5 mm. If the spacing is less than 0.5 mm, the phosphated soft steel wire, the loose-tube optical unit, and the cable core may come into contact and rub against each other, damaging the optical fiber, which may cause the optical unit core to break and the signal to be interrupted.

[0022] Furthermore, the thickness of the low-smoke halogen-free flame-retardant polyolefin sheath is 0.6mm-0.7mm. After the insulation layer is cross-linked, the molecular material is cross-linked from linear molecules into a network molecular structure. After cross-linking, the operating temperature rating of the conductor can be increased from 70℃ to 90℃, and the mechanical properties and aging properties of the insulation layer are also improved.

[0023] During the extrusion process of the outer sheath, the control of the wire feeding and die entry of the loose-fitting optical unit, two insulated soft copper conductors, and two soft steel wires for extruding the low-smoke halogen-free flame-retardant polyolefin sheath is crucial. The five extrusion unit components should have a stable die entry with consistent wire feeding tension.

[0024] In this indoor tensile-resistant butterfly-shaped optical fiber composite cable, all components work together during operation. The loose-tube optical unit, as the core component for signal transmission, utilizes the principle of total internal reflection to transmit monitoring equipment signals, image data, and various control information at high speed and stably, achieving long-distance, low-loss data transmission.

[0025] The two sides of the stranded soft copper conductors of type 2 or type 5 are wrapped with cross-linked polyethylene insulation layer. On the one hand, the soft copper conductors, with their good conductivity, undertake the task of conducting current and provide a stable power supply for indoor equipment. At the same time, they can also bear the weight, vibration and tension during hoisting and laying. On the other hand, the cross-linked polyethylene insulation layer has excellent insulation performance, effectively isolates current, prevents leakage, and ensures safe use.

[0026] The soft steel wires located above and below the loose-tube optical unit, due to their high strength and toughness, further construct a stable mechanical support system during the laying and use of the composite cable, enhancing its tensile and vibration resistance on top of the original structure. During lifting and laying, the soft steel wires can withstand the weight of the composite cable itself, as well as the tensile forces generated by dragging, pulling, and pulling, dispersing these forces and preventing excessive tensile stress on the loose-tube optical unit and the soft copper conductor, thus preventing core breakage. During use, when subjected to external forces such as vibration, the soft steel wires can absorb and buffer vibration energy, reducing the impact of vibration on the internal cores and ensuring the stability of signal transmission and power supply.

[0027] The outermost low-smoke halogen-free flame-retardant polyolefin sheath not only provides physical protection for the internal components, preventing them from being damaged by external mechanical forces, but also has excellent flame-retardant properties. In the event of a fire or other unexpected situation, it can effectively slow the spread of flames. At the same time, it emits little smoke and produces non-toxic combustion products, making it environmentally friendly and clean, which is consistent with computer rooms and environments with high traffic.

[0028] The integration of soft copper conductors (power cores) and loose-tube optical units reduces the overall size of the product, saves space, avoids complex and messy wiring, makes it easy to use, offers high cost-effectiveness, and reduces production costs.

[0029] The composite cable of this application underwent overall tensile testing and combustion testing, as detailed below:

[0030] Overall tensile test of composite cable: under test conditions of 600N for 1min, the stress-strain of the optical fiber is not greater than 0.1%.

[0031] Combustion test of composite cable: The charred portion of the sample should not exceed 50mm to 540mm from the lower edge of the upper clamp. The product's pH value ≥ 4.3, conductivity ≤ 10μS / mm, halogen content ≤ 1.0mg / g, HCl content ≤ 0.5%, smoke density, and light transmittance ≥ 60%.

[0032] The technical solutions provided by the embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the embodiments of this utility model. The description of the above embodiments is only for helping to understand the principles of the embodiments of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the embodiments of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. An indoor tensile-resistant butterfly optical photo-composite cable, characterized by: The system includes a loose-tube optical unit (1) and two flexible copper conductors (2) symmetrically distributed on the left and right sides of the loose-tube optical unit. The loose-tube optical unit includes a PBT loose tube (1-1), and the PBT loose tube contains two or four optical fibers, with the gaps filled by fiber grease. Each flexible copper conductor has a cross-sectional area of ​​0.5 mm². 2 ~1.5mm 2 Furthermore, each of the aforementioned soft copper conductors is extruded with a cross-linked polyethylene insulation layer (3), the thickness of which is 0.5mm-0.6mm. The loose-fitting optical unit and the soft copper conductor with insulation are extruded with a low-smoke halogen-free flame-retardant polyolefin sheath (5), the cross-section of which is butterfly-shaped and the thickness of which is 0.6mm-0.7mm.

2. The indoor tensile butterfly photoelectric composite cable according to claim 1, characterized in that: The PBT loose tube is formed by extruding polybutylene terephthalate into a tubular shape. The outer diameter of the PBT loose tube is 1.7 mm, the wall thickness is 0.28 mm to 0.30 mm, and the excess fiber length inside the PBT loose tube is set to 1.5‰ to 2.0‰.

3. The indoor tensile-resistant butterfly photocomposite cable according to claim 1, characterized in that: The soft copper conductor is a type 2 or type 5 stranded soft copper conductor.

4. The indoor tensile-resistant butterfly photocomposite cable of claim 1, wherein: The loose-fitting optical unit has a phosphated soft steel wire (4) symmetrically arranged on the upper and lower sides. The loose-fitting optical unit, the insulated soft copper conductor and the phosphated soft steel wire are covered with a layer of low-smoke halogen-free flame-retardant polyolefin sheath.

5. The indoor tensile-resistant butterfly photocomposite cable according to claim 4, characterized in that: The spacing between the soft steel wire and the loose-tube optical unit, and between the loose-tube optical unit and the soft copper conductor, is not less than 0.5 mm.

6. The indoor tensile-resistant butterfly photocomposite cable of claim 4, wherein: Each of the phosphated mild steel wires is a finished steel wire that has undergone phosphate treatment and has a phosphate coating on its surface. The diameter of the phosphated mild steel wire is 0.5 mm, and its tensile strength is not less than 1370 N / mm². 2 The elastic modulus is not less than 1.90×10⁵ N / mm². 2 The weight of the phosphating film is not less than 0.6 g / m. 2 .

7. The indoor tensile-resistant butterfly photocomposite cable of claim 1, wherein: The optical fiber is multimode G.651 or single-mode G.652 or single-mode G.657.

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