CN219574446U - Bending-resistant multimode optical fiber - Google Patents

Abstract

The utility model discloses a bending-resistant multimode optical fiber which aims at the problems and comprises a plurality of groups of optical fibers and a central reinforcing piece, wherein each group of optical fibers is sleeved with a sleeve, the sleeves are arranged in an annular array along the central reinforcing piece, an inner protective sleeve is sleeved on the outer surface of each sleeve, a reinforcing layer is sleeved on the outer side of each inner protective sleeve, an outer protective sleeve is sleeved on the periphery of each reinforcing layer, and bending-resistant strips are connected to the outer surface of each outer protective sleeve; the advantages are that: the central reinforcing piece is provided with the partition piece to separate each group of optical fibers, so that the impact-resistant effect is achieved while the mutual extrusion between each group of optical fibers is prevented, the optical fibers are prevented from being directly impacted by external force, the optical fibers are bent, two mounting pipes are symmetrically arranged on the outer surface of the outer layer sheath, and bending resistance of the whole optical cable is enhanced by inserting bending-resistant strips into the mounting pipes.

Description

Bending-resistant multimode optical fiber

Technical Field

The utility model relates to a bending-resistant multimode optical fiber.

Background

Fiber optic cables are manufactured to meet optical, mechanical, or environmental performance specifications by utilizing one or more optical fibers disposed in a covering sheath as a transmission medium and may be used alone or in groups of communication cable assemblies. The optical cable mainly comprises optical fibers (glass filaments like hair), a plastic protective sleeve and a plastic sheath, wherein metals such as gold, silver, copper aluminum and the like are not contained in the optical cable, and the optical cable generally has no recycling value; the optical cable is a communication line for realizing optical signal transmission, wherein a certain number of optical fibers form a cable core in a certain mode, a sheath is covered outside the cable core, and an outer sheath is covered outside the cable core; namely: a cable formed by subjecting an optical fiber (optical transmission carrier) to a certain process.

In the construction and use process of the optical cable, the problem that the transmission of optical fiber signals is affected due to the fact that the optical fiber is broken due to the fact that the bending angle of the optical cable is too large can occur; in the existing optical cable, only one reinforcing piece is arranged in the center, and the optical center has a certain supporting effect, but the effect is not obvious.

The optical fiber is fragile, and when the optical cable is influenced by external force, the optical fiber in the optical cable is easy to damage, so that the optical fiber in the optical cable is extruded and broken or cracked, and the signal transmission of the optical fiber is influenced.

Disclosure of Invention

The utility model aims to solve the technical problems that the existing optical cable is not good enough in bending resistance, and the effect of too few reinforcing pieces on bending resistance is poor; the traditional optical cable has poor vibration resistance and impact resistance and is easy to damage the optical fiber inside by external impact force; the bending-resistant multimode optical fiber comprises a plurality of groups of optical fibers and a central reinforcing piece, wherein each group of optical fibers is sleeved with a sleeve, the sleeves are arranged in an annular array along the central reinforcing piece, an inner layer sheath is sleeved on the outer surface of each sleeve, a reinforcing layer is sleeved on the outer side of each inner layer sheath, an outer layer sheath is sleeved on the periphery of each reinforcing layer, and bending-resistant strips are connected to the outer surface of each outer layer sheath.

According to the technical scheme, the partition piece is arranged on the central reinforcing piece to separate each group of optical fibers, so that the optical fibers are prevented from being mutually extruded, an anti-impact effect is achieved, the optical fibers are prevented from being bent due to direct impact of external force on the optical fibers, two mounting pipes are symmetrically arranged on the outer surface of the outer-layer sheath, and bending resistance of the whole optical cable is enhanced by inserting bending resistance strips into the mounting pipes.

The optical fiber sleeve is characterized in that the optical fibers are arranged in the sleeve, gaps are formed between the optical fibers and the sleeve, and fiber ointment is filled in the gaps and has two protection effects on the optical fibers in the loose sleeve, namely, the protection effect on preventing moisture from corroding the optical fibers and the water blocking effect is achieved, and the optical fibers are padded, so that the optical fibers can be buffered under the influence of mechanical forces such as vibration, impact and bending.

According to the technical scheme, gaps are formed between the sleeve and the inner-layer sheath and between the sleeve and the central reinforcing member, and the gaps are filled with fillers, so that the gaps between the sleeve and the inner-layer sheath and between the sleeve and the central reinforcing member are filled with the fillers, the compression resistance and the impact resistance of the whole optical cable are improved, and the optical fibers in the sleeve are better protected.

According to the technical scheme, the outer surface of the outer sheath is symmetrically provided with the mounting pipes, the mounting pipes are sleeved on the anti-folding strips, the mounting pipes are used for conveniently mounting the reinforcing piece, meanwhile, the reinforcing piece is protected, the reinforcing piece is prevented from being soaked in water, and damage is reduced.

The central reinforcing piece, the reinforcing layer and the bending-resistant strips are made of materials with higher hardness and elasticity, the central reinforcing piece, the reinforcing layer and the bending-resistant strips are provided with a certain hardness so as to be not easy to bend in a short wire section, and the elasticity is provided with a certain flexibility when the whole optical cable is in a long wire section, so that the optical cable can be wound into a coil, the storage space is reduced, and meanwhile, the optical fiber cannot be bent.

According to the technical scheme, the partition piece between two adjacent sleeves is a partition plate, one edge of the partition plate is fixed with the central reinforcing piece, the sleeves are separated to prevent the sleeves from being mutually extruded, the partition plate stands on two sides of each group of optical fibers, a certain supporting effect can be achieved, when the outside of the optical cable is impacted, the supporting frame can prevent the optical fibers from being impacted directly, and the optical fibers are protected greatly.

According to the technical scheme, the shock absorption layer is arranged between the inner-layer sheath and the sleeve, and can absorb some impact force.

Compared with the prior art, the utility model has the following beneficial effects:

according to the technical scheme, the partition piece is arranged on the central reinforcing piece to separate each group of optical fibers, so that the optical fibers are prevented from being extruded mutually, and meanwhile, an anti-impact effect is achieved, and the optical fibers are prevented from being bent due to the fact that external force directly impacts the optical fibers.

According to the technical scheme, the two mounting pipes are symmetrically arranged on the outer surface of the outer sheath, and the bending resistance of the whole optical cable is enhanced by inserting the bending-resistant strips into the mounting pipes.

Drawings

FIG. 1 is a diagram showing the structure composition of a multimode fiber resistant to bending according to the present embodiment;

fig. 2 is a transverse cross-section illustration of a bending-resistant multimode fiber cross-section according to this embodiment.

The reference numerals in the figures are respectively: group optical fiber 1, central reinforcement 2, loose tube 3, inner sheath 4, reinforcement layer 5, outer sheath 6, anti-folding strip 7, fiber ointment 8, filler 9, mounting tube 10, spacer 11, and shock absorbing layer 12.

Detailed Description

The following describes the technical solution in the embodiment of the present utility model in detail with reference to fig. 1-2 in the embodiment of the present utility model.

Example 1

As shown in fig. 1-2, a bending-resistant multimode optical fiber comprises a plurality of groups of optical fibers 1 and a central reinforcing member 2, wherein each group of optical fibers 1 is sleeved with a loose tube 3, the loose tubes 3 are arranged in an annular array along the central reinforcing member 2, an inner layer sheath 4 is sleeved on the outer surface of each loose tube 3, a reinforcing layer 5 is sleeved on the outer side of each inner layer sheath 4, an outer layer sheath 6 is sleeved on the periphery of each reinforcing layer 5, and bending-resistant strips 7 are connected on the outer surface of each outer layer sheath 6.

The outer sheath 6 and the inner sheath 4 are made of polyethylene, wherein the polyethylene is thermoplastic resin prepared by polymerizing ethylene, and also comprises a copolymer of ethylene and a small amount of alpha-olefin in industry; polyethylene is odorless, nontoxic, wax-like in hand feeling, excellent in low temperature resistance, good in chemical stability and resistant to most of acid and alkali corrosion, and the lowest use temperature can reach-100 ℃ to-70 ℃; is insoluble in common solvents at normal temperature, has small water absorption and excellent electrical insulation.

The optical fiber loose tube comprises a plurality of optical fibers 1, gaps are formed between the optical fibers 1 and the loose tube 3, optical fiber ointment 8 is filled in the gaps, the whole name of the optical fiber ointment is optical fiber ointment, the optical fiber ointment is the ointment filled in the optical fiber loose tube, in the optical cable, the optical fiber ointment is the ointment filled in the optical fiber loose tube, and in the optical cable, the structural material except the optical fiber is one of the determinants of long-term stability of the optical cable performance.

The optical fiber ointment can play two roles of protecting, namely preventing moisture from corroding the optical fiber and preventing water; secondly, the buffer pad plays a role in buffering the optical fiber from the influence of mechanical forces such as vibration, impact, bending and the like.

Gaps are also formed between the loose tube 3 and the inner sheath 4 and between the loose tube and the central reinforcing member 2, the gaps are filled with fillers 9, the fillers 9 are made of polypropylene material, and the polypropylene is semi-crystalline thermoplastic plastic; has high impact resistance, strong mechanical property and resistance to corrosion of various organic solvents and acid and alkali.

The loose tube 3 is a tube made of polypropylene or nylon, and functions to loosely hold the optical fiber in the optical cable and protect the optical fiber from the internal stress and the external side pressure.

The reinforcing layer 5 is a plastic steel strip, and the plastic steel strip is in a double-layer form.

The plastic steel belt has a plurality of good characteristics, namely: high strength: has extremely strong tensile property, is close to a steel belt with the same specification and is several times of a common plastic packaging belt.

And II: high toughness: the plastic steel belt has plastic characteristics, has special flexibility, has the elongation rate of 12 percent, can better absorb shock compared with plastic, and can avoid breakage caused by strong shock.

Thirdly,: safety: the plastic steel belt has no sharp edge of the steel belt, and can not damage the packaged objects. The operation personnel can not be injured when packing and unpacking, and all unsafe factors are avoided.

Fourth, the method comprises the following steps: the adaptability: can adapt to various climate changes, is high-temperature resistant and moisture resistant, and is less likely to lose tensile property due to rust of the steel belt caused by damp, and the wrapping strength is reduced.

Fifth step: the convenience is as follows: the weight is light, the carrying is convenient, the volume is small, the warehouse space is saved, and the used plastic steel belt can be recycled.

The partition 11 between two adjacent bushings 3 is a partition, one edge of which is fixed to the central reinforcement 2.

The central reinforcement 2 is a fiber-reinforced composite material, which is a high-performance material formed by mixing a fiber material and a matrix material (resin) in a certain proportion.

The fiber reinforced composite material has the advantages that: light and hard, non-conductive, high mechanical strength, less recovery and corrosion resistance.

The central reinforcing member 2 is not made of metal because the metal material is corroded by moisture to generate residues, and when the sleeve is broken, the residues are attached to the optical fiber to affect the refraction and propagation of the light of the optical fiber.

The partition 11 is made integrally with the center reinforcement 2.

The outer surface of the outer sheath 6 is symmetrically provided with mounting tubes 10, and the mounting tubes 10 and the outer sheath 6 are integrally manufactured and made of polyethylene materials.

The anti-bending strip 7 is inserted into the installation tube 10, the anti-bending strip 7 is made of a metal material, steel wires are generally adopted, the steel wires have good anti-bending effect in a short distance, the elasticity is good, the resetting capability is strong, certain bending can be carried out in a long distance, the anti-bending strip is convenient to curl and store, and occupied space is reduced.

Be equipped with buffer layer 12 between inlayer sheath 4 and the sleeve pipe 3, buffer layer 12 is the sleeve pipe of high density sponge preparation, and the cover is on all sleeve pipe 3 outer ends, and an limit of baffle touches with buffer layer 12 inner wall, and the optical cable is when receiving the impact, and high density sponge can preferentially help the baffle to absorb a part of impact force.

The method for using the bending-resistant multimode optical fiber in the embodiment is as follows: when the cable body of the optical cable is subjected to bending force, the central reinforcing piece 2, the reinforcing layer 5 and the bending-resistant strips 7 play a main role in bending resistance, and the outer sheath 6 plays a role in bending resistance similar to the inner sheath 4, but the effect is not excellent; when the optical cable is impacted, the outer sheath 6, the reinforcing layer 5 and the inner sheath 4 can absorb impact force at first, but because the material texture is harder, the impact force is preferentially absorbed by the shock-absorbing layer 12, and meanwhile, the shock force is absorbed, the inner extrusion is like that of the shock-absorbing layer 12 which is internally extruded by the supporting columns of the spacers 11, so that the optical fiber group 1 between two adjacent spacers is prevented from being extruded, and damage is caused.

The above embodiments are only for illustrating the technical idea of the present utility model, and the protection scope of the present utility model is not limited thereto, and any modification made on the basis of the technical scheme according to the technical idea of the present utility model falls within the protection scope of the present utility model.

Claims (7)

1. A bending-resistant multimode optical fiber comprising a plurality of groups of optical fibers (1) and a central reinforcement (2), characterized in that: each group of optical fibers (1) is sleeved with a sleeve (3), the sleeves (3) are arranged in an annular array along the central reinforcing piece (2), an inner layer sheath (4) is sleeved on the outer surface of each sleeve (3), a reinforcing layer (5) is sleeved on the outer side of each inner layer sheath (4), an outer layer sheath (6) is sleeved on the periphery of each reinforcing layer (5), an anti-folding strip (7) is connected to the outer surface of each outer layer sheath (6), and two adjacent sleeves (3) are separated by a partition piece (11).

2. A bending-resistant multimode optical fiber according to claim 1, wherein: a plurality of optical fibers (1) are arranged in each group, gaps are formed between the optical fibers (1) and the sleeve (3), and fiber ointment (8) is filled in the gaps.

3. A bending-resistant multimode optical fiber according to claim 1, wherein: a gap is also formed between the sleeve (3) and the inner sheath (4) and between the sleeve and the central reinforcing member (2), and the gap is filled with a filler (9).

4. A bending-resistant multimode optical fiber according to claim 1, wherein: the outer surface of the outer sheath (6) is symmetrically provided with mounting pipes (10), and the mounting pipes (10) are sleeved on the anti-folding strips (7).

5. A bending-resistant multimode optical fiber according to claim 1, wherein: the central reinforcement (2), the reinforcement layer (5) and the anti-folding strips (7) are made of materials with higher hardness and elasticity.

6. A bending-resistant multimode optical fiber according to claim 1, wherein: the partition (11) between two adjacent sleeves (3) is a partition, and one edge of the partition is fixed with the central reinforcing piece (2).

7. A bending-resistant multimode optical fiber according to claim 1, wherein: a shock absorption layer (12) is arranged between the inner sheath (4) and the sleeve (3).