Multi-scenario Universal Butterfly Introduced Optical Cable

Abstract

The present invention discloses a multi-scenario general butterfly-shaped optical fiber cable, which is characterized by comprising: an outer sheath and a butterfly-shaped optical fiber cable assembly sleeved in the outer sheath, wherein at least two optical fiber cable strengthening members are inlaid in the outer sheath, the cross section of the optical fiber cable strengthening member is arc-shaped, and the arc top faces outwards. Compared with the prior art, the optical fiber cable of the present invention has small cable-forming size, light weight, low cost, excellent mechanical properties and environmental properties. Without changing the structure of the butterfly-shaped optical fiber cable assembly, one optical fiber cable can simultaneously meet the wiring requirements of overhead, pipeline and indoor introduction, reduce intermediate optical fiber splicing, reduce the splicing loss of the whole link, and is convenient and fast in construction, which can greatly reduce the construction period and construction cost.

Description

Technical Field

[0001] The present invention relates to the technical field of optical cable, and particularly to a multi-scenario general butterfly-shaped drop cable. Background Art

[0002] With the development of optical communication networks and the continuous penetration of fiber access, the construction of FTTH (Fiber To The Home) networks has been increasing exponentially. Currently, the mainstream domestic operators have invested heavily in the large-scale commercialization of FTTH, and the focus of optical fiber communication network construction will shift to FTTH. The butterfly-shaped drop cable is mainly applied to the in-house introduction section of FTTH cable lines and is widely used in current domestic FTTH projects. The butterfly-shaped drop cable is divided into three types: non-self-supporting, self-supporting, and duct-type cables, which are the main access methods for current FTTH to households. The sheaths of non-self-supporting and self-supporting butterfly-shaped drop cables generally adopt polyolefin or polyvinyl chloride, and the sheath layer has good flame retardant performance. The strength members and self-supporting members can adopt metal (most commonly steel wires or steel strands) or non-metal (GFRP, KFRP, etc.) strength members according to specific requirements. Such cables are processed by extrusion molding with an extrusion die at one time, and the sheath is directly coated on the optical fiber and the strength member; the duct-type butterfly-shaped drop cable adds a water-blocking tape and an aluminum tape on the basis of the non-self-supporting butterfly-shaped drop cable, and finally sheaths with polyethylene (PE) material. These three structures are the optical cable structures for home broadband access widely used in China at present, and the cable structure has been quite mature.

[0003] With the great development of FTTH construction in recent years, the laying environment of FTTH construction is relatively complex, which not only requires flexible and convenient networking and low cost, but also requires convenient on-site construction. The laying methods of the original three mainstream in-house optical cable structures can no longer fully meet the construction laying requirements. In case of special construction occasions, such as passing through pipes or entering households overhead, two types of optical cables need to be combined originally, and connection points need to be added, which brings more inconvenience to construction. Summary of the Invention

[0004] The main purpose of the present invention is to provide a multi-scenario general butterfly-shaped drop cable, aiming to reduce the size of the optical cable, reduce the weight of the optical cable, lower the production cost, and improve the mechanical performance and environmental performance of the optical cable.

[0005] To achieve the above purpose, the present invention provides a multi-scenario general butterfly-shaped drop cable, including: an outer sheath, and a butterfly-shaped optical cable assembly sleeved in the outer sheath, wherein at least two optical cable strength members are embedded in the outer sheath, and the cross section of the optical cable strength member is arc-shaped and the arc top faces outward.

[0006] A further technical solution of the present invention is that the production material of the optical cable strength member is a flexible non-metal fiber tape.

[0007] A further technical solution of the present invention is that the flexible non-metallic fiber tape is one of a glass fiber tape, an aramid fiber tape, a ultra-high molecular weight polyethylene fiber tape, a basalt fiber tape or a quartz fiber reinforced polyimide resin matrix composite tape.

[0008] A further technical solution of the present invention is that one side or both sides of the optical cable strength member are coated with glue.

[0009] A further technical solution of the present invention is that a runway-shaped inner sheath hole is formed in the outer sheath, and the butterfly optical cable assembly is sleeved in the inner sheath hole.

[0010] A further technical solution of the present invention is that a groove is formed in the inner wall of the outer sheath, and a tearing rope is embedded in the groove.

[0011] A further technical solution of the present invention is that the butterfly optical cable assembly includes an optical fiber, a butterfly cable strength member, a butterfly cable sheath, and a water-blocking material layer. The optical fiber and the butterfly cable strength member are arranged in the butterfly cable sheath, and the water-blocking material layer is coated on the outer periphery of the butterfly cable sheath.

[0012] A further technical solution of the present invention is that the butterfly cable strength member is embedded in the butterfly cable sheath.

[0013] A further technical solution of the present invention is that there are two butterfly cable strength members, and the two butterfly cable strength members are symmetrically arranged on both sides of the optical fiber.

[0014] A further technical solution of the present invention is that the butterfly cable strength member is made of a non-metallic fiber reinforced plastic rod.

[0015] The beneficial effects of the multi-scenario general butterfly drop cable of the present invention are as follows: In the present invention, an arc-shaped non-metallic fiber tape is embedded in the outer sheath as a strength member, and a water-blocking yarn or a water-blocking tape is used as a water-blocking material. There is no need to add additional strength members such as aramid yarns or glass yarns. The cable has a small size, light weight, low cost, excellent mechanical properties and environmental properties. Without changing the structure of the butterfly optical cable assembly, one optical cable can simultaneously meet the wiring requirements of aerial, duct and indoor introduction, reduce intermediate optical fiber splicing, reduce the splicing loss of the entire link, and is convenient and fast for construction, which can greatly reduce the construction period and construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0017] Figure 1 It is a cross-sectional schematic diagram of a preferred embodiment of the multi-scenario general butterfly-shaped fiber optic cable introduced by the present invention;

[0018] Figure 2 It is a schematic diagram of the overall structure of a preferred embodiment of the multi-scenario general butterfly-shaped fiber optic cable introduced by the present invention.

[0019] Explanation of the reference numerals in the drawings:

[0020] Label Name Label Name 1 Outer Sheath 5 Optical Fiber 2 Optical Cable Reinforcement 6 Butterfly Cable Reinforcement 3 Inner Hole of Sheath 7 Butterfly Cable Sheath 4 Tear Cord 8 Water-blocking Material Layer

[0021] The realization of the purpose, functional characteristics and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Specific embodiments

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0023] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention, then the directional indications are only used to explain the relative positional relationship and movement conditions between the components in a certain specific posture (as shown in the drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0024] In addition, if there are descriptions such as "first", "second", etc. in the embodiments of the present invention, then the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions appears to be contradictory or unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0025] Please refer to Figure 1 and Figure 2, the present invention provides a multi-scenario general butterfly-shaped optical cable for indoor use, especially an arc-shaped flexible non-metallic fiber tape-reinforced multi-scenario general butterfly-shaped optical cable for indoor use. This optical cable uses a conventional indoor butterfly-shaped optical cable as a sub-unit, uses a water-blocking tape or water-blocking yarn as a water-blocking material, uses a flexible non-metallic fiber tape as an optical cable reinforcement member, and arranges two or more identical flexible non-metallic fiber tapes bent into an arc shape and evenly embedded in the outer sheath. Compared with the existing outdoor self-supporting butterfly-shaped optical cable and the butterfly-shaped optical cable for pipeline use, by using an arc-shaped non-metallic fiber tape to replace the conventional reinforcing steel wire or plastic reinforcing rod such as FRP, the arc-shaped non-metallic fiber tape-reinforced multi-scenario general butterfly-shaped optical cable can not only meet the usage scenarios of outdoor overhead, pipeline introduction, and indoor wiring at the same time, but also the arc-shaped structure design of the flexible non-metallic fiber reinforcement tape enables the optical cable to have a smaller size under certain design tensile requirements, reduces the amount of outer sheath material used, and avoids the use of other reinforcing members such as aramid yarn or fiberglass yarn. This optical cable has the advantages of small size, simple structure, convenient processing, low cost, all-dielectric, soft and easy to bend, flame retardant and water-blocking, and can be used in various indoor and outdoor environments.

[0026] Specifically, Figure 1 is a cross-sectional schematic diagram of a preferred embodiment of the multi-scenario general butterfly-shaped optical cable of the present invention, Figure 2 and is an overall structural schematic diagram of a preferred embodiment of the multi-scenario general butterfly-shaped optical cable of the present invention.

[0027] As Figure 1 and Figure 2 shown, in this embodiment, the multi-scenario general butterfly-shaped optical cable includes: an outer sheath 1 and a butterfly-shaped optical cable assembly sleeved inside the outer sheath 1. Among them, at least two optical cable reinforcement members 2 are embedded in the outer sheath 1, and the cross-section of the optical cable reinforcement member 2 is arc-shaped, and the arc top faces outward.

[0028] In this embodiment, two or more arc-shaped optical cable reinforcement members 2 are evenly embedded in the outer sheath 1. Compared with the optical cable with a circular non-metallic plastic reinforcement member of the same cross-sectional area, the diameter and wall thickness of the outer sheath 1 can be effectively reduced, thereby reducing the cost of the outer sheath 1 of the optical cable and the weight of the optical cable.

[0029] Among them, the production material of the optical cable reinforcement member 2 can be a flexible non-metallic fiber tape.

[0030] The flexible non-metallic fiber tape can be one of a glass fiber tape, an aramid fiber tape, a ultra-high molecular weight polyethylene fiber tape, a basalt fiber tape, or a quartz fiber-reinforced polyimide resin-based composite tape, or other non-metallic fiber materials. Specifically, in implementation, the flexible non-metallic fiber tape is generally about 0.4 mm, and the width can be set according to actual needs. Its tensile modulus and strength are equivalent to those of the corresponding non-metallic plastic reinforcement rods in the prior art.

[0031] In addition, in order to ensure that the flexible non-metallic fiber tape is bonded to the outer sheath 1 and plays a role in complete tensile resistance, glue is applied to one or both sides of the optical cable reinforcing member 2 in this embodiment.

[0032] In the prior art, an optical cable reinforced by two parallel circular non-metallic plastic rods is generally only limited to bending in the vertical direction, and the minimum bending radius is dozens of times the diameter of the circular rod. However, by using the flexible non-metallic fiber tape in this embodiment to replace the circular non-metallic plastic rod with the same cross-sectional area, the optical cable can be made softer and easier to bend while ensuring the same tensile force of the optical cable.

[0033] Furthermore, in this embodiment, a runway-shaped inner hole 3 of the sheath is formed in the outer sheath 1, and the butterfly optical cable assembly is sleeved in the inner hole 3 of the sheath.

[0034] It is worth noting that in this embodiment, the inner hole 3 of the sheath is set to be runway-shaped and designed in parallel with the butterfly optical cable assembly. Compared with the conventional circular inner hole, when ensuring a certain wall thickness of the outer sheath 1, the outer diameter of the optical cable can be minimized, the material consumption for manufacturing the outer sheath 1 is minimized, the manufacturing cost is saved, and at the same time, it is ensured that the butterfly optical cable assembly does not twist in the outer sheath 1, avoiding the influence on the performance and life of the optical fiber 5 due to the long-term torsional stress of the butterfly optical cable assembly.

[0035] Even further, in this embodiment, a groove is formed in the inner wall of the outer sheath 1, and a tearing cord 4 is buried in the groove.

[0036] Specifically, as an implementation manner, in this embodiment, two symmetric grooves are provided on the runway-shaped inner hole 3 of the sheath at the vertical direction of two symmetric non-metallic fiber tapes on the inner wall of the outer sheath 1 and at the position without non-metallic fiber tapes. The tearing cord 4 is buried below the two symmetric grooves. When in use, the outer sheath 1 can be peeled off by horizontally pulling the tearing cord 4, avoiding damaging the cable core by shaving the outer sheath 1.

[0037] Even further, in this embodiment, the butterfly optical cable assembly includes an optical fiber 5, a butterfly cable reinforcing member 6, a butterfly cable sheath 7, and a water-blocking material layer 8. Among them, the optical fiber 5 and the butterfly cable reinforcing member are arranged in the butterfly cable sheath 7, and the water-blocking material layer 8 is coated on the outer periphery of the butterfly cable sheath 7.

[0038] Specifically, the butterfly cable reinforcing member 6 is embedded in the butterfly cable sheath 7. There are two butterfly cable reinforcing members 6, and the two butterfly cable reinforcing members 6 are symmetrically arranged on both sides of the optical fiber 5.

[0039] As an implementation manner, the butterfly cable reinforcing member 6 is made of a non-metallic fiber reinforced plastic rod, and the water-blocking material layer 8 can use a water-blocking tape or water-blocking yarn as the water-blocking material.

[0040] The beneficial effects of the multi-scenario general butterfly-shaped indoor optical cable of the present invention are as follows: In the present invention, an arc-shaped non-metallic fiber tape is embedded in the outer sheath as a reinforcement, and a water-blocking yarn or a water-blocking tape is used as a water-blocking material. There is no need to add additional reinforcing members such as aramid yarns or fiberglass yarns. The cable has a small size, light weight, low cost, excellent mechanical properties and environmental performance. Without changing the structure of the butterfly-shaped optical cable assembly, one optical cable can meet the wiring requirements of overhead, pipeline, and indoor introduction at the same time, reduce intermediate optical fiber splicing, reduce the splicing loss of the entire link, and is convenient and fast to construct, which can greatly reduce the construction period and construction cost.

[0041] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A multi-scenario general butterfly optical fiber cable, characterized in that, Comprising: An outer sheath, and a butterfly optical cable assembly sleeved inside the outer sheath. Among them, at least two optical cable strengthening members are embedded in the outer sheath. The cross-section of the optical cable strengthening member is arc-shaped, and the arc top faces outward. The manufacturing material of the optical cable strengthening member is a flexible non-metallic fiber tape; A racetrack-shaped inner sheath hole is formed in the outer sheath, and the butterfly optical cable assembly is sleeved inside the inner sheath hole; The butterfly optical cable assembly includes an optical fiber, a butterfly cable strengthening member, a butterfly cable sheath, and a water-blocking material layer. The optical fiber and the butterfly cable strengthening member are arranged inside the butterfly cable sheath, and the water-blocking material layer is coated on the outer periphery of the butterfly cable sheath; The butterfly cable strengthening member is embedded inside the butterfly cable sheath; There are two butterfly cable strengthening members, and the two butterfly cable strengthening members are symmetrically arranged on both sides of the optical fiber; On the inner wall of the outer sheath in the vertical direction of the two symmetrical non-metallic fiber tapes, and at the position without non-metallic fiber tapes, two symmetrical grooves are provided on the racetrack-shaped inner sheath hole, and a tearing cord is buried below the two symmetrical grooves.

2. The multi-scenario general butterfly lead-in optical cable according to claim 1, wherein, The flexible non-metallic fiber tape is one of a glass fiber tape, an aramid fiber tape, a ultra-high molecular weight polyethylene fiber tape, a basalt fiber tape, or a quartz fiber reinforced polyimide resin-based composite tape.

3. The multi-scenario general butterfly-shaped fiber optic cable according to any one of claims 1-2, characterized in that, One side or both sides of the optical cable strengthening member are coated with glue.

4. The multi-scenario general butterfly-shaped fiber optic cable according to claim 1, characterized in that The butterfly cable strengthening member is made of a non-metallic fiber reinforced plastic rod.

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