A bend-resistant multi-core optical fiber cable suitable for high-speed networks

Abstract

The application relates to the technical field of optical fiber cables, in particular to a bending-resistant multi-core optical fiber cable suitable for high-speed networks, which comprises a supporting plate, a supporting rod is fixedly installed on the supporting plate, a plurality of sliding rods are slidably connected to the inner wall of the supporting rod, arc-shaped blocks are fixedly connected to the ends of the sliding rods, an arc-shaped turntable is rotatably connected to the upper end of the supporting rod, a plurality of arc-shaped grooves are uniformly formed in the arc-shaped turntable, pin rods fixedly connected with the sliding rods are slidably installed in the arc-shaped grooves, arc-shaped wire grooves are formed in the arc-shaped blocks, optical cables are installed in the arc-shaped wire grooves, reinforcing rods serving as supports are arranged at the centers of the optical cables, and a plurality of optical fibers are uniformly and circularly arranged on the reinforcing rods, so that the problems that the optical cables in the prior art cannot adapt to the corner requirements in different scenes and the fixed structures are difficult to match the new critical loss conditions of the optical cables, thereby leading to poor applicability and insufficient installation flexibility, are effectively solved.

Description

Technical Field

[0001] This invention relates to the field of optical fiber cable technology, and in particular to a bend-resistant multi-core optical fiber cable suitable for high-speed networks. Background Technology

[0002] In fiber optic transmission systems, bending loss is one of the key issues affecting signal transmission stability. When an optical fiber is bent, the total internal reflection condition of the optical signal within the fiber core is disrupted, and some optical energy leaks into the cladding, leading to signal attenuation. Especially in scenarios such as 90° wall bends and equipment corners, traditional fixed-radius bending structures cannot adapt to different installation spaces and loss control requirements. They are prone to a sharp increase in loss or even light outages due to bending radii being less than the critical value (approximately 25mm for conventional single-mode fiber) or concentrated bending angles.

[0003] Existing bending limiting structures are mostly designed with a fixed radius, such as integrated arc grooves and limiting posts. Although they can limit the minimum bending radius, they have two major drawbacks: First, the bending angle is fixed and cannot be adapted to the corner requirements in different scenarios; second, the radius is not adjustable. When the installation space is limited or the fiber type is changed (such as bending-insensitive fiber), the fixed structure is difficult to match the new critical loss conditions, resulting in poor applicability and insufficient installation flexibility. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a bend-resistant multi-core optical fiber cable suitable for high-speed networks. This effectively solves the problems of poor applicability and insufficient installation flexibility caused by the inability of the prior art to adapt to the corner requirements of different scenarios and the difficulty of the fixed structure to match new critical loss conditions.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A bend-resistant multi-core optical fiber cable suitable for high-speed networks includes a support plate, on which a support rod is fixedly mounted. Several sliding rods are slidably connected to the inner wall of the support rod, and an arc-shaped block is fixedly connected to the end of each sliding rod. An arc-shaped turntable, rotatably connected to the support plate, is provided at the upper end of the support rod. Several arc-shaped grooves are evenly formed within the arc-shaped turntable, and pins, fixedly connected to the sliding rods, are slidably mounted within each arc-shaped groove. A through arc-shaped wire groove is formed on the arc-shaped block, and an optical cable is installed within the arc-shaped wire groove. A reinforcing rod, serving as a support, is provided at the center of the optical cable. Several optical fibers are evenly distributed around the circumference of the reinforcing rod. Several inner sheaths are fitted onto the reinforcing rod with varying pitch. Several outer sheaths, corresponding one-to-one with the inner sheaths and coaxially arranged, are provided around the optical fibers, forming a filling groove between adjacent outer sheaths.

[0006] Preferably, the inner sheath is an integrally formed thin-walled sleeve structure, the inner wall of the inner sheath is interference-fitted with the reinforcing rod, and the outer wall of the inner sheath is uniformly provided with a plurality of wire bundle sleeves along the circumference. The arc groove cross section of the wire bundle sleeve is a minor arc shape matching the outer diameter of the optical fiber, and the optical fiber is fixed between the inner sheath and the outer sheath in an embedded circumferentially uniformly distributed manner.

[0007] Preferably, the inner sheath is made of modified polytetrafluoroethylene, the outer sheath is made of modified polyolefin elastomer, and the reinforcing rod is made of FRP fiber-reinforced plastic with flexible support capabilities.

[0008] Preferably, the outer sheath and the corresponding inner sheath are provided with a density-increasing section along the axial direction in areas where the optical cable is prone to bending, and the density of the inner and outer sheaths in the density-increasing section is greater than the density of the inner and outer sheaths in other areas of the optical cable.

[0009] Preferably, the filling groove is filled with a flexible cushioning filler, which is a flame-retardant elastic foam material.

[0010] Preferably, a worm gear is rotatably connected to the lower end of the support plate, the worm gear meshes with a worm wheel, and a rotating rod that is rotatably connected to the support plate is fixedly installed on the worm wheel. The upper end of the rotating rod is fixedly installed on an arc-shaped turntable.

[0011] Preferably, a mounting plate is fixedly connected to one end of the support plate, and a positioning hole is provided on the mounting plate.

[0012] Preferably, the inner wall of the arc-shaped groove of the arc-shaped block is provided with a buffer pad layer, the buffer pad layer is made of silicone material, and the buffer pad layer is attached to the outer wall of the optical cable.

[0013] Preferably, the inner wall of the support rod is provided with a sliding groove that matches the slide rod, and the slide rod and the sliding groove are in clearance fit.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This application adopts a combined transmission structure of worm gear, arc-shaped turntable, and radial slide bar to achieve independent, precise, and self-locking adjustment of bending radius and bending angle. It abandons the traditional fixed radius design of integrated arc groove and limiting post, and can match the optimal bending radius in real time according to the critical loss requirements of different installation spaces and different fiber types. It avoids the problem of increased loss and light loss caused by too small bending radius or fixed angle, and truly realizes one structure to adapt to multiple scenarios and multiple fiber specifications, greatly improving the flexibility and versatility of high-speed network cabling.

[0015] 2. The double-layer positioning design, which combines an inner sheath with a slightly curved cable bundle and an outer sheath coaxially encapsulates the multi-core optical fiber, securely fixing it in a circumferentially uniform embedded manner. This fundamentally prevents the optical fiber from misaligning, twisting, or squeezing when bent, vibrating, or compressed. Combined with flame-retardant elastic foam filler for full wrapping and buffering, it significantly reduces micro-bending loss and mechanical damage, ensuring stable and attenuated signals during long-distance, high-density transmission in high-speed networks.

[0016] 3. In areas of the optical cable prone to bending and high stress, sections with increased density of inner and outer sheaths are installed. While ensuring the overall flexibility of the optical cable, directional bending reinforcement is applied to high-frequency bending areas to effectively disperse local bending stress, strictly limit the minimum bending radius, and prevent fiber breakage and additional losses caused by excessive bending. This, combined with a central flexible FRP reinforcing rod to provide tensile support, achieves a balance between flexibility and high strength resistance to deformation. Attached Figure Description

[0017] Figure 1 This is an isometric view of a bend-resistant multi-core optical fiber cable suitable for high-speed networks according to the present invention. Figure 2 This is a front view of an anti-bend multi-core optical fiber cable suitable for high-speed networks according to the present invention. Figure 3 This is a schematic diagram of the outer sheath and optical fiber of a bend-resistant multi-core optical fiber cable suitable for high-speed networks according to the present invention; Figure 4 This is a schematic diagram of the inner sheath and cable bundle of a bend-resistant multi-core optical fiber cable suitable for high-speed networks according to the present invention. Figure 5 This is a schematic diagram of the worm gear structure of a bend-resistant multi-core optical fiber cable suitable for high-speed networks according to the present invention; Figure 6 This is a schematic diagram of the structure of an arc-shaped turntable for a bend-resistant multi-core optical fiber cable suitable for high-speed networks according to the present invention; Figure 7 This is a schematic diagram of the structure of an arc-shaped block for a bend-resistant multi-core optical fiber cable suitable for high-speed networks according to the present invention; Figure 8 This is a schematic diagram of the structure of a buffer layer for a bend-resistant multi-core optical fiber cable suitable for high-speed networks according to the present invention; In the diagram: 1. Mounting plate, 2. Positioning hole, 3. Support plate, 4. Arc-shaped block, 5. Optical cable, 6. Arc-shaped turntable, 7. Rotating rod, 8. Optical fiber, 9. Reinforcing rod, 10. Filler, 11. Outer sheath, 12. Cable bundle sleeve, 13. Inner sheath, 14. Rotating handle, 15. Worm gear, 16. Worm wheel, 17. Arc-shaped groove, 18. Pin, 19. Arc-shaped cable groove, 20. Support rod, 21. Sliding rod, 22. Filling groove, 23. Buffer pad. Detailed Implementation

[0018] like Figure 1-8 As shown, a bend-resistant multi-core optical fiber cable suitable for high-speed networks includes a support plate 3. A support rod 20 is fixedly installed on the support plate 3. Several sliding rods 21 are slidably connected to the inner wall of the support rod 20. An arc-shaped block 4 is fixedly connected to the end of the sliding rod 21. An arc-shaped turntable 6 is provided at the upper end of the support rod 20 and is rotatably connected to the support plate 3. Several arc-shaped grooves 17 are evenly opened in the arc-shaped turntable 6. Pins 18 fixedly connected to the sliding rods 21 are slidably installed in the arc-shaped grooves 17. An arc-shaped wire groove 19 is opened on the arc-shaped wire groove 19. An optical cable 5 is installed in the arc-shaped wire groove 19. A reinforcing rod 9 that can serve as a support is provided at the center of the optical cable 5. Several optical fibers 8 are evenly distributed around the circumference of the reinforcing rod 9. Several inner sheaths 13 are sleeved on the reinforcing rod 9 with varying pitch. Several outer sheaths 11 are arranged around the optical fibers 8, corresponding one-to-one with the inner sheaths 13 and coaxially arranged. A filling groove 22 is formed between adjacent outer sheaths 11.

[0019] The inner sheath 13 is an integrally formed thin-walled sleeve structure. The inner wall of the inner sheath 13 is interference-fitted with the reinforcing rod 9. The outer wall of the inner sheath 13 is uniformly provided with a plurality of wire bundle sleeves 12 along the circumference. The arc groove cross section of the wire bundle sleeve 12 is a minor arc shape that matches the outer diameter of the optical fiber 8. The optical fiber 8 is fixed between the inner sheath 13 and the outer sheath 11 in an embedded circumferentially distributed manner.

[0020] like Figure 3 and 4 As shown, the inner sheath 13 is a one-piece molded thin-walled sleeve that is directly interference-fitted onto the reinforcing rod 9. Axial and circumferential positioning is achieved through a tight fit, eliminating the need for glue or clips. Assembly is simple and positioning is reliable. The outer wall of the inner sheath 13 has a uniformly distributed inferior arc-shaped cable bundle sleeve 12, with the arc groove size precisely matching the outer diameter of the optical fiber 8. The optical fibers 8 are embedded one by one into the arc groove of the cable bundle sleeve 12, forming a uniformly distributed state in the circumferential direction. Then, the outer sheath 11 is put on to complete the covering and fixation. When the optical cable 5 is bent, the external force is first applied to the outer sheath 11 and then transmitted to the inner sheath 13 cable bundle sleeve 12 and then evenly distributed to the reinforcing rod 9. The cable bundle sleeve 12 wraps around the sides and bottom of the optical fiber 8, restricting the radial movement and circumferential torsion of the optical fiber 8, and preventing the optical fibers 8 from squeezing and misaligning with each other when bending. The inferior arc groove only wraps around about 2 / 3 of the circumference of the optical fiber 8, which ensures stable clamping and retains space for small deformation. When bending, the optical fiber 8 can slightly self-adapt and adjust without generating local stress concentration.

[0021] The inner sheath 13 and the cable bundle 12 are made of modified polytetrafluoroethylene, the outer sheath 11 is made of modified polyolefin elastomer, and the reinforcing rod 9 is made of FRP fiber-reinforced plastic with flexible support capabilities.

[0022] like Figure 3 and 4As shown, modified polytetrafluoroethylene (PTFE) has low friction and does not damage optical fiber 8, provides stable positioning and bend resistance, and reduces bending loss. Modified polyolefin elastomer has high elasticity, is flexible and easy to lay, wear-resistant and tear-resistant, and provides cushioning and compression resistance. FRP fiber-reinforced plastic has flexible support, tensile strength and no breakage, no electromagnetic interference, lightweight and corrosion resistance. Under the premise of ensuring the orderly arrangement and stable transmission of multi-core optical fiber 8, it significantly improves the bending resistance, fatigue resistance and low loss performance of optical cable 5, while meeting the installation flexibility, environmental adaptability and long-term reliability requirements of complex installation scenarios in high-speed networks.

[0023] The outer sheath 11 and its corresponding inner sheath 13 are provided with density-increasing sections along the axial direction in areas where the optical cable 5 is prone to bending. The density of the inner sheath 13 and outer sheath 11 in the density-increasing sections is greater than that of the inner sheath 13 and outer sheath 11 in other areas of the optical cable 5.

[0024] like Figure 3 As shown, directional bending reinforcement is carried out on high-frequency stressed and easily bent parts. By increasing the layout density of the inner sheath 13 and the outer sheath 11, local bending stress is dispersed, the minimum bending radius is limited, and additional losses are avoided due to excessive bending of the optical fiber 8. At the same time, without reducing the overall flexibility of the optical cable 5, the fatigue resistance and fracture resistance of key areas are improved, making it better suited for high-frequency bending installation scenarios such as complex corners and narrow spaces in high-speed networks.

[0025] The filling groove 22 is filled with a flexible cushioning filler 10, which is a flame-retardant elastic foam material.

[0026] like Figure 3 As shown, the multi-core optical fiber 8 is flexibly filled and buffered to absorb the external stress when the optical cable 5 is bent or squeezed, and to prevent the optical fibers 8 from being squeezed, displaced or damaged by friction. At the same time, it improves the overall flame retardancy and sealing of the optical cable 5, reduces signal loss caused by external impact, and enhances the stability and safety of the optical cable 5 in complex installation environments.

[0027] The lower end of the support plate 3 is rotatably connected to a worm gear 15, which meshes with a worm wheel 16. The worm wheel 16 is fixedly mounted with a rotating rod 7 that is rotatably connected to the support plate 3, and the upper end of the rotating rod 7 is fixedly mounted on an arc-shaped turntable 6.

[0028] like Figure 5As shown, a handle 14 is provided at one end of the worm gear 15. The handle 14 drives the worm gear 15 to rotate, which in turn drives the worm wheel 16 to rotate. The worm wheel 16 drives the rotating rod 7 to rotate, which in turn drives the arc-shaped turntable 6 to rotate. This achieves precise, stable, and self-locking rotation of the arc-shaped turntable 6, thereby reliably adjusting the opening and closing radius and bending limit of each arc block 4 to meet the adjustable bending radius requirements of the optical fiber 8 in different scenarios. At the same time, the reverse self-locking characteristic of the worm wheel 16 and worm gear 15 is used to prevent accidental loosening after adjustment, ensuring stable bending limit and improving the safety and reliability of installation and use.

[0029] One end of the support plate 3 is fixedly connected to the mounting plate 1, and the mounting plate 1 has a positioning hole 2.

[0030] like Figure 1 As shown, the structure can be quickly fixed to the wall, cabinet, equipment rack and other installation positions by bolts, ensuring that the fiber optic bending limit mechanism does not shake or shift during use, thus improving the overall installation convenience, fixing stability and versatility.

[0031] The inner wall of the arc groove 19 of the arc block 4 is provided with a buffer pad 23, which is made of silicone and is attached to the outer wall of the optical cable 5.

[0032] like Figure 8 As shown, the optical cable 5 is provided with flexible contact and buffer protection to avoid direct friction and compression of the optical cable 5 sheath by the hard inner wall of the arc block 4; during the bending adjustment of the optical cable 5, vibration and local stress are absorbed to reduce mechanical damage and micro-bending loss, while increasing contact friction to prevent the optical cable 5 from shifting and improving the stability of the wiring and the reliability of signal transmission.

[0033] The inner wall of the support rod 20 is provided with a sliding groove that matches the slide rod 21, and the slide rod 21 is in clearance fit with the sliding groove.

[0034] like Figure 7 As shown, the sliding groove provides precise, smooth, and stable linear guidance for the slide rod 21, ensuring that the slide rod 21 moves smoothly only radially during telescopic adjustment without wobbling, swaying, or jamming; at the same time, the reasonable gap ensures smooth movement, reduces adjustment resistance, and ensures that the opening and closing radius adjustment of the arc block 4 is precise and reliable, making the bending limit mechanism flexible and accurately positioned.

[0035] The working process of this invention is as follows: the worm gear 15 is driven to rotate by the rotating handle 14, the worm gear 15 drives the worm wheel 16 to rotate, the worm wheel 16 drives the arc-shaped turntable 6 to rotate synchronously through the rotating rod 7, the arc-shaped groove 17 on the arc-shaped turntable 6 rotates with the turntable, pushing the pin 18 in the groove to slide along the groove, the pin 18 drives the slide rod 21 to make radial linear extension and retraction movement in the sliding groove of the support rod 20, multiple slide rods 21 synchronously drive the end arc-shaped block 4 to open and close radially, the arc-shaped block 4 surrounds to form arc-shaped grooves 19 of different diameters, accurately matching the bending radius and bending angle of different installation scenarios.

[0036] Inside the optical cable 5, multiple optical fibers 8 are embedded one by one into the slightly curved bundle sleeve 12 on the outer wall of the inner sheath 13, achieving uniform circumferential embedding and fixing to prevent misalignment, compression, and twisting of the optical fibers 8. A corresponding outer sheath 11 is fitted over the inner sheath 13 after the optical fibers 8 are arranged. The inner and outer sheaths 11 are coaxially fitted to form a layered protective structure. Flame-retardant elastic foam material is filled in the filling groove 22 between adjacent outer sheaths 11 to isolate the optical fibers 8, absorb stress, and improve flame retardant and sealing performance. The central FRP reinforcing rod 9 provides flexible tensile support and, in conjunction with the inner sheath 13 and outer sheath 11, maintains the orderly arrangement of the multi-core optical fibers 8. When the optical cable 5 bends, the external force is evenly transmitted to the central reinforcing rod 9 through the outer sheath 11, inner sheath 13, and cable bundle sleeve 12, avoiding local stress concentration. The increased density of the inner sheath 13 and outer sheath 11 in the easily bendable area further disperses the high-frequency bending stress, limits the minimum bending radius, and prevents excessive bending. The silicone buffer layer 23 on the inner wall of the arc-shaped cable groove 19 flexibly adheres to the optical cable 5, reducing friction, compression, and micro-bending losses, and ensuring stable optical signal transmission. The cable bundle sleeve 12 and the filling material fix the position of the optical fiber 8, avoiding signal attenuation caused by the displacement of the optical fiber 8 during bending, and meeting the low-loss transmission requirements of high-speed networks.

[0037] By using the positioning hole 2 of the mounting plate 1 at one end of the support plate 3, the entire structure can be quickly fixed to the wall, cabinet or equipment rack with bolts, ensuring that the bending limit mechanism is stable and does not shake, and is suitable for various high-speed network cabling scenarios.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that variations may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bend-resistant multi-core optical fiber cable suitable for high-speed networks, characterized in that: Includes a support plate (3), on which a support rod (20) is fixedly installed. Several sliding rods (21) are slidably connected to the inner wall of the support rod (20). An arc-shaped block (4) is fixedly connected to the end of the sliding rod (21). An arc-shaped turntable (6) is provided at the upper end of the support rod (20) and is rotatably connected to the support plate (3). Several arc-shaped grooves (17) are evenly opened in the arc-shaped turntable (6). A pin (18) fixedly connected to the sliding rod (21) is slidably installed in the arc-shaped groove (17). The arc-shaped block (4) A through arc-shaped groove (19) is provided on the upper part. An optical cable (5) is installed in the arc-shaped groove (19). A reinforcing rod (9) that can serve as a support is provided at the center of the optical cable (5). Several optical fibers (8) are evenly distributed around the reinforcing rod (9). Several inner sheaths (13) are fitted on the reinforcing rod (9) with varying pitch. Several outer sheaths (11) that correspond one-to-one with the inner sheaths (13) and are coaxially arranged are provided around the optical fibers (8). A filling groove (22) is formed between adjacent outer sheaths (11).

2. The bend-resistant multi-core optical fiber cable suitable for high-speed networks according to claim 1, characterized in that: The inner sheath (13) is an integrally formed thin-walled sleeve structure. The inner wall of the inner sheath (13) is interference-fitted with the reinforcing rod (9). The outer wall of the inner sheath (13) is uniformly provided with several bundle sleeves (12) along the circumference. The arc groove cross section of the bundle sleeve (12) is a minor arc shape that matches the outer diameter of the optical fiber (8). The optical fiber (8) is fixed between the inner sheath (13) and the outer sheath (11) in an embedded circumferentially distributed manner.

3. The bend-resistant multi-core optical fiber cable suitable for high-speed networks according to claim 2, characterized in that: The inner sheath (13) is made of modified polytetrafluoroethylene, the outer sheath (11) is made of modified polyolefin elastomer, and the reinforcing rod (9) is made of FRP fiber-reinforced plastic with flexible support capabilities.

4. The bend-resistant multi-core optical fiber cable suitable for high-speed networks according to claim 3, characterized in that: The outer sheath (11) and its corresponding inner sheath (13) are provided with a density-increasing section along the axial direction in the area where the optical cable (5) is prone to bending. The density of the inner sheath (13) and outer sheath (11) in the density-increasing section is greater than that of the inner sheath (13) and outer sheath (11) in other areas of the optical cable (5).

5. The bend-resistant multi-core optical fiber cable suitable for high-speed networks according to claim 1, characterized in that: The filling groove (22) is filled with a flexible buffer filler (10), which is a flame-retardant elastic foam material.

6. The bend-resistant multi-core optical fiber cable suitable for high-speed networks according to claim 1, characterized in that: The lower end of the support plate (3) is rotatably connected to a worm gear (15), the worm gear (15) meshes with a worm wheel (16), the worm wheel (16) is fixedly installed with a rotating rod (7) rotatably connected to the support plate (3), and the upper end of the rotating rod (7) is fixedly installed on the arc-shaped turntable (6).

7. The bend-resistant multi-core optical fiber cable suitable for high-speed networks according to claim 1, characterized in that: The support plate (3) is fixedly connected to an installation plate (1) at one end, and the installation plate (1) has a positioning hole (2).

8. The bend-resistant multi-core optical fiber cable suitable for high-speed networks according to claim 2, characterized in that: The inner wall of the arc groove (19) of the arc block (4) is provided with a buffer pad layer (23), which is made of silicone and is attached to the outer wall of the optical cable (5).

9. The bend-resistant multi-core optical fiber cable suitable for high-speed networks according to claim 1, characterized in that: The inner wall of the support rod (20) is provided with a sliding groove that matches the slide rod (21), and the slide rod (21) is in clearance fit with the sliding groove.

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