Bending-resistant optical cable

Abstract

The utility model relates to the technical field of optical cable manufacturing, in particular to an anti-bending optical cable which comprises an optical cable body, and the optical cable body is sequentially provided with a central reinforcing piece, an elastic supporting body, an optical fiber array unit and a double-layer sheath structure from inside to outside. The central reinforcing piece is arranged in the center of the optical cable body and is of a columnar structure, the elastic supporting body wraps the outer side of the central reinforcing piece in a winding mode, the optical fiber array units are annularly and evenly arranged in a trapezoidal groove formed in the periphery of the elastic supporting body, and the double-layer sheath structure wraps the outer sides of the optical fiber array units and is aligned for positioning protection. The double-layer sheath structure comprises an inner sheath on the inner layer and a protective sleeve on the outer layer. The optical cable has the advantages of high-strength bending resistance, long service life and high practicability.

Description

Technical Field

[0001] This utility model relates to the field of optical cable manufacturing technology, specifically a bend-resistant optical cable. Background Technology

[0002] Optical cables are widely used in various fields of communication and information transmission. They can be laid in several ways, including ducts, direct burial, and overhead installation. The outer sheath of optical cables is usually made of thermoplastic materials such as PVC and PP, and reinforcement layers are added to increase tensile strength. However, in actual use, most existing optical cables are prone to fiber bending loss when encountering concentrated bending stress. This means that under dynamic conditions, the outer sheath is highly susceptible to cracking, thus affecting the normal operation of the internal optical core.

[0003] Therefore, in view of the above-mentioned problems, this technical solution proposes a bending-resistant optical cable. Utility Model Content

[0004] The purpose of this invention is to provide a bend-resistant optical cable to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A bend-resistant optical cable includes an optical cable body, which is provided with a central reinforcing member, an elastic support body, an optical fiber array unit, and a double-layer sheath structure from the inside out. The central reinforcing member is located at the center of the optical cable body and is configured as a columnar structure. The elastic support body is wrapped around the outside of the central reinforcing member. The optical fiber array unit is arranged in a ring evenly in a trapezoidal groove opened on the outer periphery of the elastic support body. The double-layer sheath structure is wrapped around the outside of the optical fiber array unit for positioning and protection. The double-layer sheath structure includes an inner sheath and an outer protective sheath.

[0007] As a further embodiment of this utility model: the central reinforcing member is set as a glass fiber reinforced epoxy resin rod with a diameter of 1.2mm, and the elastic support is made of EVA foam material.

[0008] As a further embodiment of this utility model: the elastic support includes a spiral strip, the spiral spacing of which is set to 0.6-0.8 times the diameter of the optical cable, and honeycomb holes are uniformly opened on the outer surface of the spiral strip. The honeycomb holes are designed in a trapezoidal shape along the radial direction of the spiral strip, and their diameter is between 0.3-0.5mm.

[0009] As a further embodiment of this utility model: the fiber array unit is composed of multiple optical cores, which are embedded in trapezoidal grooves on the outer periphery of the spiral band in an annular pattern at equal intervals, and the trapezoidal grooves are filled with silicone rubber.

[0010] As a further embodiment of this utility model: the outer surface of the inner sheath is provided with annular corrugated guide grooves distributed axially at intervals, the depth of the guide grooves being 30%-40% of the total thickness of the inner and outer sheaths, the outer sheath comprising a polyurethane outer layer and a fluoroplastic inner layer, the polyurethane outer layer and the fluoroplastic inner layer being co-extruded to form the outer sheath, the thickness ratio of the polyurethane outer layer to the fluoroplastic inner layer being 3:1-4:1.

[0011] Compared with the prior art, the beneficial effects of this utility model are: the optical fiber loss is reduced by 40% under small radius bending, and the number of repeated bending cycles exceeds 3,000, making it suitable for dynamic scenarios such as drone wiring and robotic arms.

[0012] Replacing traditional linear stiffeners with helical elastomers and dissipating bending stress through a honeycomb structure can significantly improve bending fatigue life.

[0013] By utilizing a fluoroplastic / polyurethane composite sheath to maintain flexibility in both low and high temperature environments, the low-temperature bending performance is significantly improved compared to a single-material sheath.

[0014] The combination of the trapezoidal groove and silicone rubber makes the strain distribution of the optical fiber uniform, which can significantly reduce the maximum strain force of the optical fiber. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the cross-sectional structure of a bend-resistant optical cable.

[0016] Figure 2 This is a schematic diagram of a three-dimensional partial structure of the connection between the fiber array unit and the spiral ribbon in a bend-resistant optical cable.

[0017] Figure 3 This is a schematic diagram of the main structure connecting the fiber array unit and the spiral ribbon in a bend-resistant optical cable.

[0018] Figure 4 This is a schematic diagram of the cross-section of a T-shaped honeycomb array in a bend-resistant optical cable.

[0019] Figure 5 for Figure 2 A magnified structural diagram of A in the diagram.

[0020] The components include: optical cable body 10, optical core 11, central reinforcement 12, elastic support 13, optical fiber array unit 14, double-layer sheath structure 15, honeycomb group hole 16, spiral ribbon 17, and trapezoidal groove 18. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0022] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] Please see Figures 1-5 A bend-resistant optical cable includes an optical cable body 10. The optical cable body 10 is provided with a central reinforcing member 12, an elastic support body 13, an optical fiber array unit 14, and a double-layer sheath structure 15 arranged sequentially from the inside to the outside. The central reinforcing member 12 is located at the center of the optical cable body 10 and is configured as a columnar structure. The elastic support body 13 is wrapped around the outside of the central reinforcing member 12 to achieve radial elastic buffering and axial compressive resistance. The optical fiber array unit 14 is evenly arranged in a ring in a trapezoidal groove 18 opened on the outer periphery of the elastic support body 13. The double-layer sheath structure 15 is wrapped around the outside of the optical fiber array unit 14 for positioning and protection. The double-layer sheath structure 15 includes an inner sheath and an outer protective sheath.

[0026] In this embodiment of the invention, the central reinforcing member 12 is set as a glass fiber reinforced epoxy resin rod with a diameter of 1.2 mm, and the elastic support 13 is made of EVA foam material. The elastic support 13 includes a spiral band 17, the spiral spacing of which is set to 0.6-0.8 times the diameter of the optical cable. At the same time, honeycomb holes 16 are uniformly opened on the outer surface of the spiral band 17. The honeycomb holes 16 are designed in a trapezoidal shape along the radial direction of the spiral band 17, and their diameter is between 0.3-0.5 mm. With the cooperation of the honeycomb holes 16 and the spiral band 17, the radial elastic buffer and axial compressive resistance can be combined to protect against bending.

[0027] The fiber array unit 14 is composed of multiple optical cores 11. The optical cores 11 are embedded in trapezoidal grooves 18 on the outer periphery of the spiral band 17 in a ring at equal intervals. At the same time, the trapezoidal grooves 18 are filled with silicone rubber to form a three-dimensional anti-torsion structure.

[0028] In one embodiment of the present invention, the outer surface of the inner sheath is provided with annular corrugated guide grooves distributed axially at intervals. The depth of the guide grooves is set to 30%-40% of the total thickness of the inner and outer sheaths. The outer sheath includes a polyurethane outer layer and a fluoroplastic inner layer. The polyurethane outer layer and the fluoroplastic inner layer are co-extruded to form the outer sheath. The thickness ratio of the polyurethane outer layer to the fluoroplastic inner layer is 3:1-4:1.

[0029] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A bend-resistant optical cable, characterized in that, The optical cable body (10) includes a central reinforcing member (12), an elastic support (13), an optical fiber array unit (14), and a double-layer sheath structure (15) arranged sequentially from the inside to the outside. The central reinforcing member (12) is located at the center of the optical cable body (10) and is configured as a columnar structure. The elastic support (13) is wrapped around the outside of the central reinforcing member (12). The optical fiber array unit (14) is evenly arranged in a ring in the trapezoidal groove (18) opened on the outer periphery of the elastic support (13). The double-layer sheath structure (15) is wrapped around the outside of the optical fiber array unit (14) for positioning and protection. The double-layer sheath structure (15) includes an inner sheath and an outer protective sleeve.

2. The anti-bending optical cable according to claim 1, characterized in that, The central reinforcing member (12) is a glass fiber reinforced epoxy resin rod with a diameter of 1.2 mm, and the elastic support (13) is made of EVA foam material.

3. The bend-resistant optical cable according to claim 2, characterized in that, The elastic support (13) includes a spiral band (17), the spiral spacing of which is set to 0.6-0.8 times the diameter of the optical cable. The outer surface of the spiral band (17) is uniformly provided with honeycomb holes (16), which are designed in a trapezoidal shape along the radial direction of the spiral band (17), and their diameter is between 0.3-0.5 mm.

4. The bend-resistant optical cable according to claim 3, characterized in that, The fiber array unit (14) is composed of multiple optical cores (11). The optical cores (11) are embedded in trapezoidal grooves (18) on the outer periphery of the spiral strip (17) in a ring at equal intervals. The trapezoidal grooves (18) are filled with silicone rubber.

5. The bend-resistant optical cable according to claim 4, characterized in that, The outer surface of the inner sheath is provided with annular corrugated guide grooves distributed at intervals along the axial direction. The depth of the guide grooves is set to 30%-40% of the total thickness of the inner and outer sheaths. The outer sheath includes a polyurethane outer layer and a fluoroplastic inner layer. The polyurethane outer layer and the fluoroplastic inner layer are co-extruded to form the outer sheath. The thickness ratio of the polyurethane outer layer to the fluoroplastic inner layer is 3:1-4:1.

Images