Anti-breaking outdoor single-mode optical cable

Abstract

The utility model relates to the technical field of communication optical cables, in particular to an anti-breaking outdoor single-mode optical cable, which comprises at least one single-mode optical fiber core, a flexible layer which is positioned in the center of the optical cable and wraps the optical fiber core, a flexible rubber sleeve made of elastic materials and a PBT (polybutylene terephthalate) rigid layer sleeved outside the flexible layer. Microgroove structures are arranged on the outer wall of the PBT rigid layer at intervals, the partition buffer layer is composed of blocky protrusions distributed in an annular dot matrix mode, and the partition buffer layer is fixed to the outer wall, between the microgroove structures, of the PBT rigid layer; the single-mode optical cable can effectively solve the problems that in outdoor laying of an existing single-mode optical cable, when the optical cable is bent by a small radius, the local rigidity is too large, optical fiber damage is easily caused, the stress concentration effect cannot be effectively restrained, and optical fiber microcracking and communication faults are easily caused when the optical cable is subjected to repeated bending or falling impact.

Description

TECHNICAL FIELD

[0001] The utility model relates to communication cable technical field, concretely relates to an outdoor single mode optical cable of preventing breakage. BACKGROUND

[0002] With the rapid popularization of optical fiber communication system, outdoor optical cable is often applied to metropolitan area network, long distance transmission line and access network scenes. These optical cables face many complex environmental challenges in actual laying process, such as undulating terrain, winding route, narrow space, low temperature climate and mobile laying etc. Under the above application environment, the optical cable often appears repeated bending, sharp corner laying, temporary pulling and other use conditions, which can easily cause the microbending loss of optical fiber core, local compression loss and even breakage, thereby affecting the overall communication quality and system stability.

[0003] Traditional outdoor single mode optical cable adopts linear arrangement of metal reinforcing member to cooperate with hard sheath to improve compression strength, although it has certain mechanical protection ability, but when the optical cable is bent with small radius, the local rigidity is too large to cause optical fiber damage. At the same time, although the part of reinforced structure is improved in tensile property, it often ignores the flexible buffer and multi-stage decoupling design in the optical cable, which cannot effectively inhibit the stress concentration effect, especially when subjected to repeated bending or drop impact, which can easily cause optical fiber microcrack and communication failure.

[0004] Therefore, it is urgent to provide a composite optical cable structure which can have structural strength while considering flexible buffer and multi-point protection, so as to improve the comprehensive adaptability and service life in outdoor complex environment. UTILITY MODEL CONTENTS

[0005] Technical problem solved

[0006] In view of the above shortcomings of the prior art, the utility model provides an outdoor single mode optical cable of preventing breakage, which can effectively solve the problems that the local rigidity is too large to cause optical fiber damage when the existing single mode optical cable is bent with small radius in outdoor laying, and the stress concentration effect cannot be effectively inhibited, which can easily cause optical fiber microcrack and communication failure when subjected to repeated bending or drop impact.

[0007] Technical scheme

[0008] In order to achieve the above purpose, the utility model is realized by the following technical scheme:

[0009] The utility model provides an outdoor single mode optical cable of preventing breakage, which comprises at least one single mode optical fiber core, which is located at the center of the optical cable;

[0010] And a flexible layer wrapped outside the optical fiber core, the flexible layer is a soft rubber sleeve made of elastic material;

[0011] And the PBT rigid layer outside the flexible layer is provided with a micro-groove structure on the outer wall thereof at intervals;

[0012] Further comprising a partition buffer layer, which is fixed on the outer wall of the PBT rigid layer between the micro-groove structures and is in the form of a block-shaped protrusion in a ring-shaped lattice distribution.

[0013] The partition buffer layer is further provided with a waterproof layer and an outer sheath in sequence from outside.

[0014] Further, the flexible layer is made of silica gel material and has a thickness of 1.2-1.5 mm and is coaxially extruded with the optical fiber core.

[0015] Further, the rigid layer has a thickness of 0.4-0.6 mm.

[0016] Further, the flexible layer and the PBT rigid layer are connected together through dovetail groove structures.

[0017] Further, the micro-groove structure is a wave groove body or a spiral groove body, and the width of the micro-groove structure is 4.0-4.8 mm and is distributed at intervals along the axial direction of the optical cable.

[0018] Further, the partition buffer layer is in the form of a foamed ring belt structure, and each ring belt structure is composed of a plurality of foamed TPU blocks.

[0019] Further, the waterproof layer is a PE waterproof tape with adhesive, which is wrapped around the partition buffer layer.

[0020] Further, the outer sheath is made of black polyethylene material resistant to ultraviolet radiation and is integrally coated on the inner layer structure through extrusion forming.

[0021] Advantages

[0022] Compared with the known prior art, the technical scheme provided by the utility model has the following advantages:

[0023] The utility model discloses a partition buffer layer and a rigid layer are combined, so that the optical cable has excellent bending resistance in complex environment.

[0024] The multi-layer buffer design between the soft layer and the rigid layer can effectively disperse stress and avoid the limitations of a single buffer layer.

[0025] Meanwhile, the micro-groove structure of the PBT rigid layer is designed to separate, so that the PBT rigid layer has rigidity and flexibility, so that the optical cable has good stability and adaptability in the process of traction and winding, and ensures that the optical cable will not be broken due to excessive tension, and adapts to repeated construction, laying and maintenance operation in outdoor environment. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0027] Fig. 1 The perspective view of the internal structure of the optical cable of the present embodiment is shown in the figure.

[0028] Fig. 2 The schematic diagram of the PBT rigid layer and the partition buffer layer of the optical cable of the present embodiment is shown in the figure.

[0029] Fig. 3 The schematic diagram of the radial cross section of the optical cable of the present embodiment is shown in the figure.

[0030] The numbers in the figure represent: 10, optical fiber core; 20, flexible layer; 21, dovetail groove; 30, PBT rigid layer; 31, micro-groove structure; 40, partition buffer layer; 41, foamed TPU block; 50, waterproof layer; 60, reinforcing layer; 70, outer sheath. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely in the following with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0032] The present application will be further described in the following with reference to the embodiments.

[0033] Embodiment:

[0034] The utility model provides a kind of outdoor single-mode optical cable of preventing breakage, the improvement design core of the present scheme is the structure improvement of optical cable combination layer, by introducing the PBT rigid protective tube with micro-slot structure 31, the soft silicone layer in the middle and the design of partition buffer, the compression resistance and bending resistance of optical cable are improved, and laying adaptability is improved.The optical cable of the present scheme gives consideration to flexible buffer and multipoint protection composite optical cable structure to improve the comprehensive adaptability and service life under complex outdoor environment.

[0035] Reference Figs. 1-3 The main structure of the optical cable in the present scheme includes optical fiber core 10, flexible layer 20, PBT rigid layer 30, partition buffer layer 40, waterproof layer 50, reinforcing layer 60 and outer sheath 70 from inside to outside. The components of the single-mode optical cable will be specifically described below.

[0036] It includes at least one single-mode optical fiber core 10, which is located at the center of the optical cable. The present scheme is explained by a single-core optical cable suitable for long-distance transmission.

[0037] The flexible layer 20 is wrapped outside the optical fiber core 10. The flexible layer 20 is a soft rubber sleeve made of elastic material. In the present embodiment, the flexible layer 20 is preferably made of silicone material. When combined with the optical fiber core 10, the optical fiber is passed through the center and the silicone is uniformly coated around it by using a horizontal synchronous extrusion method through an extrusion process. The flexible layer 20 can absorb the stress generated when the optical cable is bent, effectively reducing the risk of breakage of the optical fiber core 10.

[0038] The PBT rigid layer 30 is sleeved outside the flexible layer 20. The outer wall of the PBT rigid layer 30 is provided with micro-slot structures 31 at intervals. The PBT rigid layer 30 can improve the lateral compression strength of the optical cable, prevent the optical cable from deforming after being stepped and extruded, and serve as an intermediate support layer to improve the impact resistance and structural stability of the optical cable. The PBT rigid layer 30 has good compression bending resistance. Its material properties enable the optical cable to maintain appropriate flexibility in different scenarios, avoiding excessive bending that can cause optical fiber breakage, thereby improving communication quality and system stability.

[0039] The thickness of the PBT rigid layer 30 is 0.4-0.6mm, which is not too thick, so that the rigid layer has a certain bending property. The micro-slot structure 31 in the present embodiment is preferably a spiral groove body. The width of the micro-slot structure 31 is 4.0-4.8mm and is distributed at intervals along the axis of the optical cable. The spiral groove body is equivalent to introducing a "micro-bending deformable mechanism" to improve the flexibility of bending. The PBT rigid layer 30 combines rigidity and flexibility, so that the optical cable has good stability and adaptability during traction and winding, ensuring that the optical cable will not break due to excessive tension, and adapting to repeated construction, laying and maintenance operations in outdoor environments.

[0040] The partition buffer layer 40 is also included, which is composed of block-shaped protrusions in a ring-shaped lattice distribution, and is fixed on the outer wall of the PBT rigid layer 30 between the micro groove structures 31; wherein the block-shaped protrusions in the embodiment are foamed ring belt structures, and each ring belt structure is composed of a plurality of foamed TPU blocks 41, wherein the foamed TPU blocks 41 can be replaced by foamed EVA, and the density is controlled to be 0.2-0.4 g / cm3, which meets the requirements of structural flexibility and buffer strength. During molding, a multi-channel intermittent glue injection structure is designed in the mold head, and the foamed TPU is formed on the outer wall of the PBT rigid layer 30 by staggered injection.

[0041] The partition buffer layer 40 composed of the foamed TPU blocks 41 with uniform gaps in the embodiment is different from the traditional continuous glue layer, but is in an intermittent distribution state in the axial direction of the optical cable. On the one hand, when the optical cable is bent or subjected to lateral pressure, the continuous glue layer may gather stress points; and the partition glue of the embodiment can form an elastic buffer belt, play the role of dislocation sliding + shock decoupling, and improve the anti-breaking capacity. On the other hand, the foamed TPU blocks 41 designed in the partition can be equivalent to “glue nails”, which can limit the slip of the PBT rigid layer 30 caused by thermal expansion and cold shrinkage.

[0042] Finally, the partition buffer layer 40 is further provided with a waterproof layer 50, a reinforcing layer 60 and an outer sheath 70 from outside.

[0043] The reinforcing layer 60 is mainly composed of steel wires or FRP as tensile elements, and is designed in layers with the PBT rigid layer 30, so that the reinforcing layer 60 can bear force more safely when the optical cable needs to be pulled during laying. Specifically, the waterproof layer 50 is a PE waterproof tape with adhesive, which is wrapped around the partition buffer layer 40. The outer sheath 70 is a black polyethylene material resistant to ultraviolet radiation, which is integrally coated on the inner layer structure by extrusion molding. The outer sheath 70 has good wear resistance, weather resistance and aging resistance.

[0044] In the design of the flexible layer 20, the flexible layer 20 is made of silica gel material, and is coaxially extruded and formed with the optical fiber core 10 with a thickness of 1.2-1.5 mm. The flexible layer 20 and the PBT rigid layer 30 are connected together through the dovetail groove 21 structure. Such a design is used to stabilize the soft and hard combination interface.

[0045] The optical cable has excellent bending resistance in complex environments by adopting the structure of the partition buffer layer 40 combined with the rigid layer. The optical cable can effectively avoid the problem of optical fiber breakage caused by excessive bending, thereby improving the communication quality and the stability of the system. And a multi-layer buffer design is formed between the soft layer, which can effectively disperse stress and avoid the limitations of a single buffer layer. In the case of micro bending or local bending, the partition buffer layer 40 can evenly share external force, thereby reducing stress concentration and avoiding damage to the optical fiber core 10.

[0046] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the same. Although the present application has been described in detail with reference to the foregoing examples, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing examples can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present application.

Claims

1. A kink-resistant outdoor single-mode optical fiber cable, characterized by, The utility model relates to a kind of optical cable, including: At least one single-mode fiber core is located in the center of the optical cable; Flexible layer wrapped outside the fiber core, the flexible layer is soft rubber sleeve made of elastic material; PBT rigid layer is sleeved outside the flexible layer, and the outer wall of the PBT rigid layer is spaced apart with micro-groove structure; Partition buffer layer is constituted by annular dot matrix distribution block convex, and the partition buffer layer is fixed on the outer wall of the PBT rigid layer between the micro-groove structure; Wherein, the partition buffer layer outward still is equipped with waterproof layer and outer sheath in proper order.

2. The kink-resistant outdoor single-mode optical fiber cable of claim 1, wherein, The flexible layer adopts silica gel material, and the thickness is 1.2mm~1.5mm, and is coaxially extruded with the fiber core and is formed.

3. The kink-resistant outdoor single-mode fiber optic cable of claim 2, wherein, The thickness of the PBT rigid layer is 0.4~0.6mm.

4. The kink-resistant outdoor single-mode fiber optic cable of claim 3, wherein, The flexible layer and rigid layer are connected together by dovetail groove structure.

5. The kink-resistant outdoor single-mode fiber optic cable of claim 3, wherein, The micro-groove structure is wave groove body or spiral groove body, and the width of the micro-groove structure is 4.0~4.8mm, and is spaced apart along the axial direction of the optical cable.

6. The kink-resistant outdoor single-mode fiber optic cable of claim 1, wherein, The partition buffer layer is foamed ring belt structure, and each ring foamed ring belt structure is composed of multiple foamed TPU blocks.

7. The kink-resistant outdoor single-mode fiber optic cable of claim 1, wherein, The waterproof layer is PE waterproof tape with back glue, and the PE waterproof tape is circumferentially wound and covers the partition buffer layer.

8. The kink-resistant outdoor single-mode fiber optic cable of claim 1, wherein, The outer sheath is black polyethylene material resistant to ultraviolet radiation, and the inner layer structure is integrally coated by extrusion forming.

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