Multi-core prefabricated end-forming butterfly-shaped leading-in optical cable

Abstract

The utility model discloses a multi-core prefabricated end-forming butterfly-shaped leading-in optical cable, which comprises an optical cable body, one end of the optical cable body is provided with a connector, the optical cable body comprises an inner sheath, a protective layer and a cable core, the protective layer comprises an outer sheath and a functional layer, the outer sheath is arranged on the outer side of the functional layer, and the cable core is arranged on the outer side of the functional layer. The functional layer comprises a waterproof layer, a flame-retardant layer, a shielding layer I, a shielding layer II and an insulating layer, the waterproof layer, the flame-retardant layer, the shielding layer I, the shielding layer II and the insulating layer are sequentially arranged from outside to inside, the shielding layer I is a high-permeability alloy belt, the shielding layer I is spirally wound on the outer side of the shielding layer II, the shielding layer II is an aluminum foil belt, and the insulating layer is arranged on the outer side of the shielding layer II. And the shielding layer II is spirally wound on the outer side of the insulating layer. The signal transmission stability is improved, the practicability is improved, and therefore the problems that an external electromagnetic environment is complex and changeable, optical fibers in an optical cable can be interfered, and the signal transmission performance is affected are solved.

Description

Technical Field

[0001] This utility model relates to the field of optical cable technology, specifically a multi-core pre-terminated butterfly-shaped drop optical cable. Background Technology

[0002] With the rapid development of communication technology, the requirements for bandwidth and stability of data transmission are becoming increasingly stringent. Butterfly-shaped drop cables, as a common type of indoor cabling optical cable, are widely used in broadband access networks in homes, businesses, and other locations due to their flat shape, good flexibility, and ease of installation.

[0003] For example, the authorized patent with announcement number CN209373217U (a multi-core pre-terminated butterfly-shaped drop optical cable) includes an optical cable body, a water-proof membrane is provided on the inner wall of the optical cable body, and a cross disc is provided on the inner side of the water-proof membrane and at the center of the optical cable body. The interior of the cross disc is filled with flame-retardant rubber, and non-metallic reinforcing members are provided in the four arm ends of the cross disc. A shaping reinforcing member is provided at the center of the core sleeve.

[0004] Although the existing technology has a cross-shaped structure and can accommodate four cable cores, it lacks a shielding structure. Furthermore, the external electromagnetic environment is complex and variable, and electromagnetic radiation from power lines and electrical equipment can interfere with the optical fibers inside the cable, affecting signal transmission performance. Therefore, the market urgently needs to develop a multi-core pre-terminated butterfly-shaped drop cable to help people solve the existing problems. Utility Model Content

[0005] The purpose of this invention is to provide a multi-core pre-terminated butterfly-shaped drop cable to solve the problem mentioned in the background art, which is that the complex and changeable external electromagnetic environment can interfere with the optical fibers in the cable and affect the signal transmission performance.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a multi-core pre-terminated butterfly-shaped drop optical cable, comprising an optical cable body, one end of which is provided with a connector, the optical cable body comprising an inner sheath, a protective layer and a cable core, the protective layer comprising an outer sheath and a functional layer, the outer sheath being disposed outside the functional layer, the functional layer comprising a water-blocking layer, a flame-retardant layer, a first shielding layer, a second shielding layer and an insulating layer, the water-blocking layer, the flame-retardant layer, the first shielding layer, the second shielding layer and the insulating layer being arranged sequentially from the outside to the inside, the first shielding layer being a high-permeability alloy strip, the first shielding layer being spirally wound around the outside of the second shielding layer, the second shielding layer being an aluminum foil strip, the second shielding layer being spirally wound around the outside of the insulating layer.

[0007] Preferably, multiple cable cores are provided, and the multiple cable cores are spaced apart inside the inner sheath. Each cable core includes a fiber core and a shielding film. The shielding film is wrapped around the outside of the fiber core and is made of nanocrystalline alloy film.

[0008] Preferably, the inner sheath has a spacer layer between two adjacent cable cores, and the spacer layer is a silver-plated copper braided mesh.

[0009] Preferably, the inner sheath has symmetrical reinforcing members at both ends, and the reinforcing members are made of glass fiber reinforced plastic.

[0010] Preferably, stabilizing elements are symmetrically arranged on both the upper and lower sides of the inner sheath, and the stabilizing elements are made of rubber material.

[0011] Preferably, the space between the inner sheath and the protective layer is filled with cotton or linen material.

[0012] Preferably, the outer sheath is made of polyolefin material, the water-blocking layer is made of aluminum-plastic composite tape and water-blocking yarn, the flame-retardant layer is made of low-smoke halogen-free material, and the insulation layer is made of polyvinyl chloride material.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] (1) The utility model includes a shielding layer 1 and a shielding layer 2 in the protective layer. The shielding layer 1 is made of a high magnetic permeability alloy strip spirally wound on the outside of the shielding layer 2, and the shielding layer 2 is made of aluminum foil strip spirally wound on the outside of the insulation layer. The multi-layer shielding design can effectively resist external electromagnetic interference. The high magnetic permeability alloy strip and the aluminum foil strip work together to form a reliable electromagnetic shielding barrier, preventing electromagnetic radiation from entering the optical cable, thereby protecting the optical fiber from electromagnetic interference, ensuring the stability and reliability of signal transmission, and improving the performance of the optical cable in complex electromagnetic environments.

[0015] (2) By setting multiple cable cores at intervals, this utility model can effectively reduce signal crosstalk between cable cores. The nanocrystalline alloy film, as a shielding film, has good magnetic shielding performance, which can further protect the fiber core from external electromagnetic interference and mutual influence between cable cores, thereby reducing the impact of electromagnetic interference on the optical signal transmission in the fiber core and improving the overall signal transmission quality of the optical cable.

[0016] (3) By setting up a reinforcing member made of glass fiber reinforced plastic, the present invention can effectively enhance the overall tensile strength and bending performance of the optical cable. By using a stabilizing member made of rubber material, it can buffer and dampen the optical cable when it is subjected to external impact or vibration, and prevent the inner sheath 3 from shifting inside the optical cable, thus ensuring the stability of the optical cable structure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a multi-core pre-terminated butterfly-shaped drop cable according to the present invention;

[0018] Figure 2 This is a side sectional view of the optical cable body of this utility model;

[0019] Figure 3 This is a schematic diagram of the cable core structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the internal structure of the functional layer of this utility model.

[0021] In the diagram: 1. Optical cable body; 2. Connector; 3. Inner sheath; 4. Protective layer; 401. Outer sheath; 402. Functional layer; 4021. Water-blocking layer; 4022. Flame-retardant layer; 4023. Shielding layer one; 4024. Shielding layer two; 4025. Insulation layer; 5. Cable core; 501. Fiber core; 502. Shielding film; 6. Reinforcing component; 7. Spacing layer; 8. Cotton and linen material; 9. Stabilizing component. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Please see Figure 1-4 This utility model provides an embodiment of a multi-core pre-terminated butterfly-shaped drop optical cable, including an optical cable body 1, with a connector 2 at one end of the optical cable body 1. The optical cable body 1 includes an inner sheath 3, a protective layer 4, and a cable core 5. The protective layer 4 includes an outer sheath 401 and a functional layer 402. The outer sheath 401 is disposed outside the functional layer 402. The functional layer 402 includes a water-blocking layer 4021, a flame-retardant layer 4022, a first shielding layer 4023, a second shielding layer 4024, and an insulating layer 4025. The water-blocking layer 4021, the flame-retardant layer 4022, the first shielding layer 4023, the second shielding layer 4024, and the insulating layer 4025 are arranged sequentially from the outside to the inside. The first shielding layer 4023 is a high-permeability alloy strip, which is spirally wound around the outside of the second shielding layer 4024. The second shielding layer 4024 is an aluminum foil strip, which is spirally wound around the outside of the insulating layer 4025.

[0024] A composite shielding system is formed by a shielding layer 4023 made of high-permeability alloy strip and a shielding layer 4024 made of aluminum foil strip. The high-permeability alloy strip can efficiently absorb low-frequency magnetic field interference, such as the power frequency magnetic field of power lines, while the aluminum foil strip can reflect high-frequency electromagnetic waves, such as RF interference generated by electrical equipment. The two work together to achieve stable electromagnetic shielding, which increases practicality.

[0025] Please see Figure 2 and Figure 3 Multiple cable cores 5 are provided, and multiple cable cores 5 are spaced apart inside the inner sheath 3. The cable core 5 includes a fiber core 501 and a shielding film 502. The shielding film 502 is wrapped around the outside of the fiber core 501 and is made of nanocrystalline alloy film.

[0026] The spacing between multiple cable cores 5 can effectively reduce signal crosstalk between cable cores 5 and improve the overall transmission performance of the optical cable. The nanocrystalline alloy film, as a shielding film, has good magnetic shielding performance, which can further protect fiber core 501 from external electromagnetic interference and mutual influence between cable cores 5. It can effectively absorb and disperse electromagnetic energy, reduce the impact of electromagnetic interference on the optical signal transmission in fiber core 501, and ensure the independence and stability of signal transmission of each fiber core 501, thereby improving the overall signal transmission quality of the optical cable and enabling the optical cable to work more efficiently in multi-core transmission scenarios.

[0027] Please see Figure 2 The inner sheath 3 has a spacer layer 7 between two adjacent cable cores 5, and the spacer layer 7 is made of silver-plated copper braided mesh.

[0028] The spacer layer 7 of the silver-plated copper braided mesh provides excellent electrical isolation, preventing electrical short circuits or signal interference between adjacent cable cores. The silver plating improves the conductivity of the copper braided mesh, enabling it to better guide and disperse any potential static or stray currents, preventing them from affecting the cable core 5. At the same time, the copper braided mesh structure has a certain degree of flexibility and strength, providing additional mechanical protection for the cable core 5 without affecting its normal bending and laying, thus improving the reliability and service life of the optical cable.

[0029] Please see Figure 2 The inner sheath 3 has symmetrical reinforcing members 6 at both ends, which are made of glass fiber reinforced plastic.

[0030] Glass fiber reinforced plastic has high strength and rigidity, which can effectively enhance the overall tensile strength and bending resistance of optical cables. During the laying and use of optical cables, they will inevitably be subjected to tensile and bending forces. The reinforcing member 6 can withstand these external forces and protect the cable core 5 and fiber core 501 inside the inner sheath 3 from damage. Moreover, glass fiber reinforced plastic is lightweight and will not add too much weight burden to the optical cable, which facilitates the laying and installation of the optical cable and improves the durability and reliability of the optical cable.

[0031] Please see Figure 2 Stabilizers 9 are symmetrically arranged on the upper and lower sides of the inner sheath 3, and the stabilizers 9 are made of rubber material.

[0032] Rubber material has good elasticity and flexibility. The stabilizer 9 can buffer and dampen the optical cable when it is subjected to external impact or vibration, reduce the stress on the inner sheath 3 and the cable core 5, and protect the cable core 5 and fiber core 501 from damage. At the same time, the setting of the stabilizer 9 is conducive to the positional stability of the inner sheath 3, prevents the inner sheath 3 from being displaced inside the optical cable, and ensures the stability of the optical cable structure.

[0033] Please see Figure 2 The space between the inner sheath 3 and the protective layer 4 is filled with cotton and linen material 8.

[0034] Cotton and linen materials have good flexibility and water absorption. They can fill the gap between the inner sheath 3 and the protective layer 4, making the optical cable structure more compact and preventing relative slippage between the internal layers when the optical cable is bent or subjected to external force, thereby improving the overall stability of the optical cable.

[0035] Please see Figure 2 and Figure 4 The outer sheath 401 is made of polyolefin material, the water-blocking layer 4021 is made of aluminum-plastic composite tape and water-blocking yarn, the flame-retardant layer 4022 is made of low-smoke halogen-free material, and the insulation layer 4025 is made of polyvinyl chloride material.

[0036] The outer sheath 401 is made of polyolefin material, which has excellent weather resistance, chemical corrosion resistance, and flexibility. It protects the optical cable from external factors such as ultraviolet radiation and acids / alkalis under various harsh environmental conditions. Its flexibility also facilitates the laying and installation of the optical cable. The water-blocking layer 4021 is composed of aluminum-plastic composite tape and water-blocking yarn. The aluminum-plastic composite tape has excellent barrier properties, and the water-blocking yarn absorbs and locks in moisture. Together, they form a highly efficient water-blocking barrier, effectively preventing moisture from penetrating the optical cable and protecting the cable core and fiber core. It is also flame-retardant. Layer 4022 is made of low-smoke halogen-free material. In the event of a fire in the optical cable, the low-smoke halogen-free material can reduce the generation of smoke and toxic gases, reducing harm to people and the environment. At the same time, it has good flame-retardant properties and can delay the spread of fire. Insulation layer 4025 is made of polyvinyl chloride (PVC). PVC has good electrical insulation properties, which can effectively isolate the optical fiber from the external environment, prevent electrical short circuits and signal interference, and ensure the signal transmission performance of the optical cable. The reasonable selection and combination of these different materials together improve the overall performance and service life of the optical cable.

[0037] Working principle: During use, when the optical signal is transmitted in the fiber core 501, the electromagnetic protection structure is formed by the nanocrystalline alloy film shielding film 502, the silver-plated copper braided mesh spacer layer 7, and the double-layer shielding structure from the inside out, which shields external electromagnetic interference. The glass fiber reinforced plastic reinforcing member 6 and the rubber stabilizing member 9 form a mechanical protection structure to protect the cable core 5 from external damage. The water-blocking layer 4021 and the cotton and linen material 8 filler form a waterproof barrier, while the low-smoke halogen-free flame-retardant layer 4022 and the polyvinyl chloride insulation layer 4025 ensure fire safety and electrical isolation, thereby enabling the optical cable to work stably in complex electromagnetic environments and achieve stable transmission of multi-core signals.

[0038] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A multi-core pre-terminated butterfly-shaped drop cable, comprising an optical cable body (1), characterized in that: One end of the optical cable body (1) is provided with a connector (2). The optical cable body (1) includes an inner sheath (3), a protective layer (4), and a cable core (5). The protective layer (4) includes an outer sheath (401) and a functional layer (402). The outer sheath (401) is disposed outside the functional layer (402). The functional layer (402) includes a water-blocking layer (4021), a flame-retardant layer (4022), a first shielding layer (4023), a second shielding layer (4024), and an insulation layer (4025). 5) The water-blocking layer (4021), flame-retardant layer (4022), shielding layer one (4023), shielding layer two (4024) and insulating layer (4025) are arranged sequentially from the outside to the inside. The shielding layer one (4023) is a high magnetic permeability alloy strip. The shielding layer one (4023) is spirally wound around the outside of the shielding layer two (4024). The shielding layer two (4024) is an aluminum foil strip. The shielding layer two (4024) is spirally wound around the outside of the insulating layer (4025).

2. The multi-core pre-terminated butterfly-shaped drop cable according to claim 1, characterized in that: The cable core (5) is provided in multiple ways, and the multiple cable cores (5) are spaced apart inside the inner sheath (3). The cable core (5) includes a fiber core (501) and a shielding film (502). The shielding film (502) is wrapped around the outside of the fiber core (501) and is set as a nanocrystalline alloy film.

3. A multi-core pre-terminated butterfly-shaped drop cable according to claim 2, characterized in that: The inner sheath (3) has a spacer layer (7) between two adjacent cable cores (5) inside, and the spacer layer (7) is a silver-plated copper braided mesh.

4. A multi-core pre-terminated butterfly-shaped drop cable according to claim 1, characterized in that: The inner sheath (3) has symmetrical reinforcing members (6) at both ends, and the reinforcing members (6) are made of glass fiber reinforced plastic.

5. A multi-core pre-terminated butterfly-shaped drop cable according to claim 1, characterized in that: The inner sheath (3) is symmetrically provided with stabilizing elements (9) on the upper and lower sides, respectively, and the stabilizing elements (9) are made of rubber material.

6. A multi-core pre-terminated butterfly-shaped drop cable according to claim 1, characterized in that: The space between the inner sheath (3) and the protective layer (4) is filled with cotton and linen material (8).

7. A multi-core pre-terminated butterfly-shaped drop cable according to claim 1, characterized in that: The outer sheath (401) is made of polyolefin material, the water-blocking layer (4021) is made of aluminum-plastic composite tape and water-blocking yarn, the flame-retardant layer (4022) is made of low-smoke halogen-free material, and the insulation layer (4025) is made of polyvinyl chloride material.

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