Enhanced rodent bite resistant flame retardant optical cable

Abstract

This utility model discloses an enhanced rodent-resistant and flame-retardant optical cable, comprising multiple colored optical fibers inserted into PBT loose tubes. Each loose tube is filled with water-blocking fiber grease. The multiple PBT loose tubes and the included filler ropes are twisted around a non-metallic central reinforcing core to form a compact cable core. A binding layer is provided outside the cable core for fixation. A water-blocking compound is filled between the binding layer, the PBT loose tubes, the filler ropes, and the non-metallic central reinforcing core. A first water-blocking tape longitudinal wrapping layer is provided outside the binding layer. An inner sheath is provided outside the first water-blocking tape longitudinal wrapping layer. A single thin round non-metallic reinforcing armor layer is provided outside the inner sheath. A second water-blocking tape longitudinal wrapping layer is provided outside the non-metallic reinforcing armor layer. This enhanced rodent-resistant and flame-retardant optical cable has multiple advantages, effectively preventing moisture intrusion, ensuring stable optical signal transmission, strong tensile strength, and suitability for laying in various complex environments. The non-metallic reinforcing armor layer enhances the cable's rodent resistance.

Description

Technical Field

[0001] This utility model relates to the field of communication optical cable technology, specifically an enhanced rodent-resistant and flame-retardant optical cable. Background Technology

[0002] An optical fiber cable is a cable composed of many technically processed optical fibers used to transmit optical signals. It is mainly composed of optical fibers (optical transmission carriers) formed into a cable core through certain processes and encased in a sheath. The function of an optical fiber cable is based on the principle of optical signal propagation and refraction, enabling it to carry massive amounts of data and achieve fast and reliable long-distance information transmission.

[0003] When fiber optic cables are laid in areas where rodent infestations are frequent, they often face a serious problem: these cables are easily chewed by rats, which can damage the cables, cause communication interruptions, and affect the normal transmission of information. Utility Model Content

[0004] The purpose of this invention is to provide an enhanced rodent-resistant flame-retardant optical cable that can better meet the laying environment requirements of those with strict flame-retardant performance and those facing the risk of rodent gnawing, and can solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an enhanced rodent-resistant flame-retardant optical cable, comprising multiple colored optical fibers, which are inserted into PBT loose tubes. Each loose tube is filled with water-blocking fiber grease. The multiple PBT loose tubes and the filling ropes contained therein are twisted around a non-metallic central reinforcing core to form a compact cable core. A binding layer is provided outside the cable core for fixation. A water-blocking compound is filled between the binding layer, the PBT loose tubes, the filling ropes, and the non-metallic central reinforcing core. A first water-blocking tape longitudinal wrapping layer is provided outside the binding layer. An inner sheath is provided outside the first water-blocking tape longitudinal wrapping layer. A single thin round non-metallic reinforcing armor layer is provided outside the inner sheath. A second water-blocking tape longitudinal wrapping layer is provided outside the non-metallic reinforcing armor layer. A low-smoke halogen-free flame-retardant outer sheath is compositely connected outside the second water-blocking tape longitudinal wrapping layer.

[0006] Preferably, the total number of the PBT loose tube and the included filler rope is at least 5.

[0007] Preferably, the non-metallic central reinforcing core is made of non-metallic material GFRP, and the elastic modulus of the non-metallic central reinforcing core is not less than 50 GPa.

[0008] Preferably, the PBT loose tube is polybutylene terephthalate.

[0009] Preferably, the non-metallic reinforcing armor layer is a non-metallic reinforcing GFRP.

[0010] Preferably, the inner protective layer is made of low-smoke halogen-free flame-retardant material with an average thickness of not less than 0.9 mm; the low-smoke halogen-free flame-retardant outer sheath is also made of low-smoke halogen-free flame-retardant material with an average thickness of not less than 1.8 mm.

[0011] Preferably, the optical fiber is either a single-mode fiber or a multimode fiber, and has a variety of identifiable colors.

[0012] Preferably, the outer diameter of the PBT loose tube shall not be less than 1.8 mm and the thickness shall not be less than 1.5 mm.

[0013] Preferably, the outer diameter of the GFRP in the non-metallic reinforcing armor layer shall not be less than 1.5 mm.

[0014] Preferably, the thickness of the water-blocking tape in the longitudinal wrapping layer of the first water-blocking tape shall not be less than 0.2 mm.

[0015] Compared with existing technologies, the beneficial effects of this utility model are as follows: The enhanced rodent-resistant flame-retardant optical cable has multiple advantages. It exhibits excellent flame-retardant properties, better meeting the laying environments with strict requirements for flame-retardant performance and the risk of rodent gnawing. Its application range is wider and it is safer to use. Its reasonable structural design effectively prevents moisture intrusion, ensuring stable transmission of optical signals. The optical cable has high mechanical strength and strong tensile strength, making it suitable for laying in various complex environments. The double water-blocking barrier further improves the water-blocking performance of the optical cable. The non-metallic reinforcing armor layer enhances the rodent resistance of the optical cable and extends its service life. The use of a low-smoke halogen-free flame-retardant outer sheath ensures that the optical cable does not produce toxic fumes when burning, meeting environmental protection requirements and ensuring safe use. Attached Figure Description

[0016] Figure 1 This is a schematic cross-sectional view of the overall structure of this utility model.

[0017] In the diagram: 1. Colored optical fiber; 2. PBT loose tube; 3. Water-blocking fiber paste; 4. Non-metallic central reinforcing core; 5. Water-blocking compound; 6. First water-blocking tape longitudinal wrapping layer; 7. Filler rope; 8. Binding layer; 9. Inner sheath; 10. Non-metallic reinforcing armor layer; 11. Second water-blocking tape longitudinal wrapping layer; 12. Low-smoke halogen-free flame-retardant outer sheath. Detailed Implementation

[0018] 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.

[0019] Please see Figure 1 The diagram shows an enhanced rodent-resistant flame-retardant optical cable, comprising multiple colored optical fibers 1, which are inserted into PBT loose tubes 2. Each loose tube is filled with water-blocking fiber grease 3. The multiple PBT loose tubes 2 and the filling ropes 7 contained therein are twisted around a non-metallic central reinforcing core 4 to form a compact cable core. A binding layer 8 is provided outside the cable core for fixation. A water-blocking compound 5 is filled between the binding layer 8, the PBT loose tubes 2, the filling ropes 7, and the non-metallic central reinforcing core 4. A first water-blocking wrapping layer 6 is provided outside the binding layer 8. An inner sheath 9 is provided outside the first water-blocking wrapping layer 6. A single thin round non-metallic reinforcing armor layer 10 is provided outside the inner sheath 9. A second water-blocking wrapping layer 11 is provided outside the non-metallic reinforcing armor layer 10. A low-smoke halogen-free flame-retardant outer sheath 12 is compositely connected to the second water-blocking wrapping layer 11.

[0020] This enhanced rodent-resistant and flame-retardant optical cable achieves multiple protections through its unique structural design. Multiple colored optical fibers 1 are inserted into PBT loose tubes 2, which are filled with water-blocking fiber grease 3 to effectively prevent moisture from entering the optical fibers and ensure stable transmission of optical signals. Multiple PBT loose tubes 2 and filler ropes 7 are twisted around the non-metallic central reinforcing core 4 to form a compact cable core, which enhances the mechanical strength and tensile strength of the optical cable. The cable core is fixed by a binding layer 8, and the water-blocking compound 5 filled between the binding layer 8, PBT loose tubes 2, filler ropes 7, and non-metallic central reinforcing core 4 further blocks moisture. The setting of the first water-blocking wrapping layer 6 and the second water-blocking wrapping layer 11 provides a double water barrier for the optical cable. The inner sheath 9 and the low-smoke halogen-free flame-retardant outer sheath 12 provide internal protection and external flame-retardant protection, respectively. The non-metallic reinforcing armor layer 10 enhances the optical cable's resistance to rodent bites.

[0021] Please see Figure 1 The total number of the PBT loose tube 2 and the filling rope 7 contained therein is at least 5.

[0022] These PBT loose tubes 2 are evenly distributed along the outer periphery of the non-metallic central reinforcing core 4. Each PBT loose tube 2 contains an optical fiber 3. This design not only improves the capacity of the optical cable, but also ensures the stability and protection of the optical fiber within the cable. The filler rope 7 fills the gaps between adjacent PBT loose tubes 2 and between the PBT loose tubes 2 and the non-metallic central reinforcing core 4, effectively preventing damage to the optical fiber caused by internal gaps during bending or stretching of the optical cable. This further improves the mechanical and transmission performance of the optical cable. In addition, the combined use of multiple PBT loose tubes 2 and filler rope 7 makes the structure of the optical cable more compact, facilitating laying and maintenance.

[0023] Please refer to Figure 1 The non-metallic central reinforcing core 4 is made of non-metallic GFRP, and the elastic modulus of the non-metallic central reinforcing core 4 is not less than 50 GPa. This choice of high elastic modulus material ensures the stability and durability of the optical cable in complex environments. GFRP (glass fiber reinforced plastic) as the central reinforcing core not only provides excellent tensile strength, but also effectively reduces the overall weight of the optical cable, making construction and installation easier.

[0024] The PBT loose tube 2 is made of polybutylene terephthalate (PET). This material possesses excellent heat resistance, chemical resistance, and mechanical strength, effectively protecting the optical fiber from damage caused by the external environment.

[0025] The non-metallic reinforcing armor layer 10 is made of GFRP (Geometric Fiber Reinforced Plastic), designed to further enhance the mechanical strength and rodent resistance of the optical cable. This non-metallic reinforcing armor layer 10 tightly wraps around the outer perimeter of the optical cable, forming a double protection with the internal non-metallic central reinforcing core 4, greatly improving the durability and stability of the optical cable in harsh environments.

[0026] The inner protective layer 9 is made of low-smoke halogen-free flame retardant material, with an average thickness of not less than 0.9 mm; the low-smoke halogen-free flame retardant outer sheath 12 is also made of low-smoke halogen-free flame retardant material, with an average thickness of not less than 1.8 mm.

[0027] The selection of these two low-smoke halogen-free flame-retardant materials not only meets the high requirements of modern communication optical cables for environmental protection and safety, but also significantly improves the flame-retardant performance of optical cables in extreme situations such as fires. The inner sheath 9, as an important protective layer of the internal structure of the optical cable, has a carefully designed thickness that can effectively isolate external moisture, humidity, and minor physical damage, providing a stable and safe transmission environment for optical fibers. The outer sheath 12, as the outermost layer of the optical cable, has a thicker low-smoke halogen-free flame-retardant material that not only enhances the mechanical strength of the optical cable, but also effectively slows the spread of fire and reduces smoke generation in the event of a fire, thereby ensuring the safety of personnel and property.

[0028] The optical fiber 1 is one of single-mode and multi-mode optical fibers and has a variety of identifiable colors. These color codes not only make it easy for installation and maintenance personnel to quickly identify different functions or types of optical fibers on site, but also improve the efficiency and accuracy of optical cable cabling.

[0029] The outer diameter of the PBT loose tube 2 shall not be less than 1.8 mm and the thickness shall not be less than 0.3 mm. This design ensures that the PBT loose tube 2 has sufficient strength and rigidity to protect the internal optical fiber from the influence of the external environment.

[0030] The outer diameter of the GFRP in the non-metallic reinforcing armor layer 10 must not be less than 1.5 mm. This specification ensures that the non-metallic reinforcing armor layer 10 has excellent tensile strength and corrosion resistance, providing stable and durable protection for the optical cable even under harsh environmental conditions. The choice of GFRP (glass fiber reinforced plastic) material is not only due to its lightweight and high strength, but also because of its good insulation properties and weather resistance, which effectively prevent electromagnetic interference and moisture erosion, further improving the reliability and service life of the optical cable.

[0031] The thickness of the water-blocking tape in the first water-blocking longitudinal layer 6 shall not be less than 0.2 mm. This thickness design ensures that the first water-blocking longitudinal layer 6 has good waterproof performance and can effectively prevent water from penetrating into the optical cable.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An enhanced rodent-resistant flame-retardant optical cable, comprising multiple colored optical fibers (1), characterized in that, Multiple colored optical fibers (1) are inserted into PBT loose tubes (2), each loose tube is filled with water-blocking fiber paste (3), multiple PBT loose tubes (2) and the contained filler rope (7) are twisted around the non-metallic central reinforcing core (4) to form a compact cable core, and a binding layer (8) is provided outside the cable core for fixation. Water-blocking compound (5) is filled between the binding layer (8), the PBT loose tube (2), the filler rope (7) and the non-metallic central reinforcing core (4). A first water-blocking wrapping layer (6) is provided outside the binding layer (8), an inner sheath (9) is provided outside the first water-blocking wrapping layer (6), a single fine round non-metallic reinforcing armor layer (10) is provided outside the inner sheath (9), a second water-blocking wrapping layer (11) is provided outside the non-metallic reinforcing armor layer (10), and a low-smoke halogen-free flame-retardant outer sheath (12) is compositely connected outside the second water-blocking wrapping layer (11).

2. The enhanced rodent-resistant, flame-retardant optical fiber cable of claim 1, wherein: The total number of the PBT loose tube (2) and the filling rope (7) contained therein is at least 5.

3. The enhanced rodent-resistant, flame-retardant optical fiber cable of claim 1, wherein: The non-metallic central reinforcing core (4) is made of non-metallic material GFRP, and the elastic modulus of the non-metallic central reinforcing core (4) is not less than 50 GPa.

4. The enhanced rodent-resistant, flame-retardant optical fiber cable of claim 1, wherein: The PBT loose tube (2) is polybutylene terephthalate.

5. The enhanced rodent-resistant flame-retardant optical cable according to claim 1, characterized in that: The non-metallic reinforcing armor layer (10) is a non-metallic reinforcing GFRP.

6. The enhanced rodent-resistant, flame-retardant optical fiber cable of claim 1, wherein: The inner protective layer (9) is made of low-smoke halogen-free flame retardant material with an average thickness of not less than 0.9 mm; the low-smoke halogen-free flame retardant outer sheath (12) is also made of low-smoke halogen-free flame retardant material with an average thickness of not less than 1.8 mm.

7. The enhanced rat-bite resistant, flame-retardant optical fiber cable of claim 5, wherein: The optical fiber (1) is one of single-mode optical fiber and multimode optical fiber, and has a variety of identifiable colors.

8. The enhanced rodent-resistant flame-retardant optical cable according to claim 5, characterized in that: The outer diameter of the PBT loose sleeve (2) shall not be less than 1.8 mm and the thickness shall not be less than 0.3 mm.

9. The enhanced rodent-resistant flame-retardant optical cable according to claim 5, characterized in that: The outer diameter of the GFRP in the non-metallic reinforcing armor layer (10) shall not be less than 1.5 mm.

10. The enhanced rat-bite resistant, flame-retardant optical fiber cable of claim 1, wherein: The thickness of the water-blocking strip in the first water-blocking strip longitudinal layer (6) shall not be less than 0.2 mm.

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