Bending-resistant FRP reinforced communication optical cable

Abstract

This utility model discloses a bend-resistant FRP reinforced communication optical cable, relating to the field of optical cable technology. The utility model includes: an FRP reinforcing rod core; and a cable core, the cable core being disposed outside the FRP reinforcing rod core. This utility model, using the FRP reinforcing rod core as its core, effectively resists external bending forces, ensuring the optical cable maintains a stable shape in complex environments. The optical fibers are tightly arranged in the cable core, and fiber grease filling provides buffering and lubrication, reducing the probability of fiber damage and ensuring stable signal transmission. The FRP reinforcing layer provides multi-directional tensile and bending resistance, resisting external bending forces, while the metal braided mesh armor layer possesses tensile and impact resistance as well as electromagnetic shielding functions, resisting external physical damage and electromagnetic interference. This effectively avoids signal transmission problems caused by fiber damage due to bending, ensuring reliable operation of the communication network in various complex laying environments, significantly improving communication quality, and reducing communication risks.

Description

Technical Field

[0001] This utility model relates to the field of optical cable technology, specifically to a bending-resistant FRP reinforced communication optical cable. Background Technology

[0002] In today's digital age, communication technology is developing at an astonishing pace, and the rapid and stable transmission of information has become crucial to the operation of society. As an important carrier of information transmission, the performance of optical fiber cables directly affects the stability and reliability of communication systems. With the widespread application of emerging technologies such as 5G and the Internet of Things, and the increasing demand for communication in complex environments such as remote mountainous areas and the seabed, the performance requirements for optical fiber cables are becoming increasingly stringent, with bending resistance becoming a critical consideration.

[0003] In practical applications, optical fiber cables often need to be laid in various complex environments. For example, in urban underground pipelines, optical cables may be bent due to factors such as the construction of other pipelines and ground subsidence; in mountainous areas, optical cables need to be laid along rugged terrain, inevitably encountering large bending angles. Traditional optical fiber cables have a relatively simple structure, and the optical fibers inside are easily squeezed and twisted when encountering large bending forces, which can change the signal transmission path inside the optical fiber, resulting in signal attenuation, distortion, or even interruption, seriously affecting communication quality and posing a huge hidden danger to the normal operation of communication networks. Utility Model Content

[0004] The purpose of this utility model is to provide a bending-resistant FRP reinforced communication optical cable to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model specifically adopts the following technical solution: a bending-resistant FRP reinforced communication optical cable, comprising: an FRP reinforcing rod core; a cable core, the cable core being disposed on the outside of the FRP reinforcing rod core, the cable core including multiple optical fibers disposed on the outer periphery of the FRP reinforcing rod core, the spaces between the multiple optical fibers being filled with fiber grease; a loose tube, the loose tube being sleeved on the outside of the cable core, the outer wall of the loose tube having multiple annular grooves evenly spaced along its length; an FRP reinforcing layer, the FRP reinforcing layer being wound around the outside of the loose tube, the FRP reinforcing layer being composed of multiple layers of FRP fiber cloth, the winding directions of adjacent layers of FRP fiber cloth being perpendicular to each other; a metal braided mesh armor layer, the metal braided mesh armor layer being disposed on the outside of the FRP reinforcing layer; and an outer sheath, the outer sheath covering the outside of the metal braided mesh armor layer.

[0006] Furthermore, the optical fiber is a quartz optical fiber, and its surface is coated with a layer of anti-bending protective coating.

[0007] Furthermore, the depth of the annular groove is 1 / 3 to 1 / 2 of the wall thickness of the loose sleeve.

[0008] Furthermore, the metal woven mesh armor layer is woven from stainless steel wire with a diameter of 0.1-0.3 mm and a weaving density of 80%-95%.

[0009] Furthermore, a water-blocking layer is provided between the inner wall of the outer sheath and the outer side of the metal woven mesh armor layer. The water-blocking layer has a double-layer structure, with the inner layer being a water-absorbing and swelling type water-blocking tape and the outer layer being a heat-melting type water-blocking yarn. The water-absorbing and swelling type water-blocking tape has a water absorption and swelling rate of ≥500%, and the heat-melting type water-blocking yarn has a melting temperature of 110-130℃.

[0010] Furthermore, the outer wall of the outer sheath is provided with anti-slip texture, which is in the shape of continuous spiral protrusions.

[0011] Furthermore, a metal foil shielding layer is provided between the metal woven mesh armor layer and the outer sheath. The metal foil shielding layer is an aluminum-polyethylene composite tape with a thickness of 0.08-0.15 mm.

[0012] Furthermore, the UV-resistant coating between the metal foil shielding layer and the outer sheath is composed of polyurethane-modified silicone resin and has a thickness of 50-80 μm.

[0013] The beneficial effects of this utility model are as follows:

[0014] This invention uses an FRP (fiberglass reinforced plastic) core to effectively resist external bending forces, ensuring the optical cable maintains a stable shape in complex environments. The tightly packed optical fibers within the core, along with fiber grease filling, act as a buffer and lubricant, reducing the likelihood of fiber damage and ensuring stable signal transmission. The FRP reinforcing layer provides multi-directional tensile and bending resistance, resisting external bending forces, while the metal braided mesh armor layer offers tensile and impact resistance as well as electromagnetic shielding, protecting against external physical damage and electromagnetic interference. This effectively prevents signal transmission problems caused by fiber bending damage, ensuring reliable operation of the communication network in various complex laying environments, significantly improving communication quality, and reducing communication risks. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a utility model Figure 1 A three-dimensional sectional view of the structure;

[0017] Figure 3 This is a utility model Figure 1 Plan view of the outer and inner sheaths;

[0018] Figure 4 This is a utility model Figure 1 A cross-sectional view of the plan structure of the intermediate water-blocking layer.

[0019] Reference numerals: 1. FRP reinforcing rod core; 2. Cable core; 21. Optical fiber; 22. Fiber grease; 3. Loose tube; 31. Annular groove; 4. FRP reinforcing layer; 5. Metal braided mesh armor layer; 6. Outer sheath; 7. Bending-resistant protective coating; 8. Water-blocking layer; 81. Water-absorbing and expanding water-blocking tape; 82. Hot-melt water-blocking yarn; 9. Metal foil shielding layer; 10. UV-resistant coating. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0021] like Figure 1-4 As shown, one embodiment of this utility model discloses a bend-resistant FRP reinforced communication optical cable, comprising: an FRP reinforcing rod core 1; the FRP reinforcing rod core is made of glass fiber reinforced epoxy resin.

[0022] Cable core 2, the cable core 2 is disposed on the outside of the FRP reinforcing rod core 1, the cable core 2 includes multiple optical fibers 21 disposed on the outer periphery of the FRP reinforcing rod core 1, and fiber grease 22 is filled between the multiple optical fibers 21.

[0023] Loose tube 3, the loose tube 3 is sleeved on the outside of the cable core 2, and a plurality of annular grooves 31 are provided at equal intervals along the length direction on the outer wall of the loose tube 3;

[0024] FRP reinforcing layer 4, which is wrapped around the outside of the loose tube 3, is composed of multiple layers of FRP fiber cloth, and the winding directions of adjacent FRP fiber cloth layers are perpendicular to each other.

[0025] Metal woven mesh armor layer 5, wherein the armor layer 5 is disposed on the outside of the FRP reinforcing layer 4;

[0026] Outer sheath 6, which covers the outside of the metal woven mesh armor layer 5.

[0027] As the core support component, the FRP reinforcing rod core 1 provides a solid foundation for the entire optical cable with its high strength and high modulus characteristics. It effectively resists the damage to the overall structure of the optical cable caused by external bending forces, ensuring that the optical cable can maintain a relatively stable shape in complex environments such as urban underground pipelines affected by construction or mountainous terrain. The multiple optical fibers 21 in the cable core 2 are arranged closely around the FRP reinforcing rod core 1. They are the key carriers for optical signal transmission. The fiber grease 22 filling the gaps between the optical fibers plays a buffering and lubricating role. When the optical cable is subjected to external forces such as bending, the fiber grease 22 can reduce the mutual compression and friction between the optical fibers, reduce the probability of damage to the optical fibers due to external forces, ensure the stability of the signal transmission path inside the optical fiber, and avoid problems such as signal attenuation and distortion. The loose tube 3 is fitted on the outside of the cable core 2. The design of the annular groove 31 on its outer wall increases the contact area between the loose tube and the external structure, improves the friction, and makes the structure of each layer tightly bonded. On the other hand, when the optical cable is bent, the annular groove 31 can serve as a stress dispersion point, change the stress distribution path, and prevent excessive stress concentration in a certain place, which would damage the internal optical fiber. The FRP reinforcing layer 4 is wrapped around the outside of the loose tube 3. It consists of multiple layers of FRP fiber cloth with adjacent layers wrapped perpendicular to each other. This structure gives the reinforcing layer good multi-directional tensile and bending resistance, and can resist external bending forces in all directions, further enhancing the overall bending resistance of the optical cable and providing stronger protection for the internal optical fibers. The metal braided mesh armor layer 5 is located on the outermost side. It not only has a certain tensile and impact resistance, and can resist external physical damage, such as scratches from construction tools and bites from animals, but also shields against external electromagnetic interference, ensuring that the signal transmission inside the optical cable is not affected by the external electromagnetic environment, maintaining the purity and stability of the communication signal. Thus, in various complex laying environments, the optical cable, through the synergistic effect of its various parts, effectively avoids signal transmission problems caused by optical fiber damage due to bending, ensuring the reliable operation of the communication network.

[0028] like Figure 2 As shown, in some embodiments, the optical fiber 21 is a quartz optical fiber with a bend-resistant protective coating 7 on its surface.

[0029] The optical fiber 21 undergoes special anti-bending treatment and is coated with an anti-bending protective coating 7. This protective coating 7 can significantly enhance the anti-bending ability of the optical fiber 21, so that the internal signal transmission path can remain stable when the optical fiber 21 is subjected to a large bending force, effectively avoiding signal attenuation, distortion or even interruption.

[0030] like Figure 2 As shown, in some embodiments, the depth of the annular groove 31 is 1 / 3 to 1 / 2 of the wall thickness of the loose sleeve 3.

[0031] The depth of the annular groove 31 on its outer wall is 1 / 3 to 1 / 2 of the wall thickness of the loose sleeve 3. This depth design ensures that the annular groove 31 has enough space to distribute stress, and does not weaken the overall strength of the loose sleeve 3 due to being too deep.

[0032] like Figure 3 As shown, in some embodiments, the metal woven mesh armor layer 5 is woven from stainless steel wire with a diameter of 0.1-0.3 mm and a weaving density of 80%-95%.

[0033] Stainless steel wire has good corrosion resistance and high strength, which can effectively resist external physical damage, such as scratches from construction tools and bites from animals. The reasonable design of the braiding density ensures that the armor layer provides sufficient protection without making the optical cable too heavy or affecting its flexibility.

[0034] like Figure 4 As shown, in some embodiments, a water-blocking layer 8 is provided between the inner wall of the outer sheath 6 and the outer side of the metal woven mesh armor layer 5. The water-blocking layer 8 has a double-layer structure, with the inner layer being a water-absorbing and swelling type water-blocking tape 81 and the outer layer being a heat-melting type water-blocking yarn 82. The water-absorbing and swelling type water-blocking tape 81 has a water absorption and swelling rate ≥500%, and the heat-melting type water-blocking yarn 82 has a melting temperature of 110-130℃.

[0035] When optical cables encounter moisture intrusion, such as in damp underground pipe environments or flooding, the water-absorbing and expanding water-blocking tape 81 can quickly absorb moisture and expand, thereby effectively blocking further water penetration channels and preventing moisture from spreading along the internal structure of the optical cable. This avoids the optical fiber from getting damp, which would lead to a decrease in signal transmission performance. When optical cables are affected by local high temperatures, such as when laid near pipes close to heat sources or in extreme situations such as fires, the heat-melting water-blocking yarn 82 can melt and fuse with other materials, further enhancing the water-blocking effect. At the same time, it can also play a certain role in fire prevention and flame retardancy, protecting the internal structure of the optical cable from high-temperature damage.

[0036] like Figure 1 As shown, in some embodiments, the outer wall of the outer sheath 6 is provided with anti-slip texture, which is in the shape of continuous spiral protrusions.

[0037] The outer sheath 6 has anti-slip textures on its outer wall, which makes it easier for construction workers to grip and operate during construction, thus improving construction efficiency.

[0038] like Figure 3 As shown, in some embodiments, a metal foil shielding layer 9 is provided between the metal woven mesh armor layer 5 and the outer sheath 6. The metal foil shielding layer 9 is an aluminum-polyethylene composite tape with a thickness of 0.08-0.15 mm.

[0039] The aluminum-polyethylene composite tape combines the excellent electromagnetic shielding properties of aluminum with the corrosion resistance and flexibility of polyethylene. The aluminum layer effectively reflects and absorbs external electromagnetic waves, further enhancing the electromagnetic shielding effect of the optical cable and preventing external electromagnetic interference from affecting fiber optic communication signals, ensuring high-quality and stable signal transmission. The polyethylene layer provides good insulation and environmental resistance, protecting the aluminum layer from corrosion and extending the service life of the optical cable. This composite structure not only improves the overall performance of the optical cable but also enables it to maintain reliable communication capabilities even in harsh environments.

[0040] like Figure 3 As shown, in some embodiments, the UV-resistant coating 10 between the metal foil shielding layer 9 and the sheath 6 is composed of polyurethane-modified silicone resin and has a thickness of 50-80 μm.

[0041] Polyurethane-modified silicone resin has excellent UV resistance, effectively absorbing and reflecting ultraviolet rays, preventing aging and cracking caused by long-term exposure of the optical cable outer sheath 6 to ultraviolet rays. This coating not only enhances the weather resistance of the optical cable, but also extends its service life in outdoor environments, enabling it to adapt to various complex climatic conditions, such as long-term exposure to direct sunlight or laying in areas with large temperature differences.

[0042] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A bend-resistant FRP reinforced communication optical cable, characterized in that, include: FRP reinforced rod core (1); Cable core (2), the cable core (2) is disposed on the outside of the FRP reinforcing rod core (1), the cable core (2) includes multiple optical fibers (21) disposed on the outer periphery of the FRP reinforcing rod core (1), and fiber grease (22) is filled between the multiple optical fibers (21). Loose tube (3), the loose tube (3) is sleeved on the outside of the cable core (2), and multiple annular grooves (31) are provided at equal intervals along the length direction on the outer wall of the loose tube (3). FRP reinforcement layer (4), the FRP reinforcement layer (4) is wrapped around the outside of the loose tube (3), the FRP reinforcement layer (4) is composed of multiple layers of FRP fiber cloth, and the winding directions of two adjacent layers of FRP fiber cloth are perpendicular to each other; A metal woven mesh armor layer (5) is disposed on the outside of the FRP reinforcing layer (4); Outer sheath (6), which covers the outside of the metal woven mesh armor layer (5).

2. The bending-resistant FRP reinforced communication optical cable according to claim 1, characterized in that, The optical fiber (21) is a quartz optical fiber, and its surface is coated with a layer of anti-bending protective coating (7).

3. The bending-resistant FRP reinforced communication optical cable according to claim 1, characterized in that, The depth of the annular groove (31) is 1 / 3 to 1 / 2 of the wall thickness of the loose sleeve (3).

4. The bending-resistant FRP reinforced communication optical cable according to claim 1, characterized in that, The metal woven mesh armor layer (5) is woven from stainless steel wire with a diameter of 0.1-0.3 mm and a weaving density of 80%-95%.

5. The bending-resistant FRP reinforced communication optical cable according to claim 1, characterized in that, A water-blocking layer (8) is provided between the inner wall of the outer sheath (6) and the outer side of the metal woven mesh armor layer (5). The water-blocking layer (8) has a double-layer structure, with the inner layer being a water-absorbing and swelling type water-blocking tape (81) and the outer layer being a hot-melt type water-blocking yarn (82). The water-absorbing and swelling type water-blocking tape (81) has a water absorption and swelling rate ≥500%, and the hot-melt type water-blocking yarn (82) has a melting temperature of 110-130℃.

6. The bending-resistant FRP reinforced communication optical cable according to claim 1, characterized in that, The outer wall of the outer sheath (6) is provided with anti-slip texture, which is a continuous spiral protrusion.

7. The bending-resistant FRP reinforced communication optical cable according to claim 1, characterized in that, A metal foil shielding layer (9) is provided between the metal woven mesh armor layer (5) and the outer sheath (6). The metal foil shielding layer (9) is an aluminum-polyethylene composite tape with a thickness of 0.08-0.15 mm.

8. The bending-resistant FRP reinforced communication optical cable according to claim 7, characterized in that, The UV-resistant coating (10) between the metal foil shielding layer (9) and the outer sheath (6) is made of polyurethane modified silicone resin and has a thickness of 50-80 μm.

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