High tensile and high compression resistant optical-electrical hybrid optical cable

Abstract

The application discloses a kind of high tensile high compression optical-electric hybrid optical cable, including by outer to inside sequentially arranged outer sheath, compression-resistant protective layer, electromagnetic shielding layer and cable core, cable core includes central strengthening unit and optical-electric transmission unit.The application uses glass fiber reinforced plastic rod as rigid skeleton, improves axial tensile stiffness, by spiral winding aramid yarn on outer surface, it is beneficial to decompose axial tension into yarn direction component force, maximize fiber strength utilization, improve the tensile capacity of optical-electric hybrid cable;Double-layer stainless steel belt is reversely spiral wound with a certain overlap rate, so that the interlocking effect is generated when two layers of stainless steel belt are compressed, resist radial deformation, eliminate pressure weak point, improve the compression resistance of optical-electric hybrid cable;The gap of double-layer stainless steel belt layer is filled with a composite filler formed by compounding nano-silicon dioxide particles and silicone rubber, which is beneficial to uniform dispersion of pressure, and the silicone rubber has a certain elasticity, so that the composite filler has a certain resilience and can absorb impact energy.

Description

Technical Field

[0001] This invention belongs to the field of optical cable technology, specifically relating to a high tensile and high compressive strength optoelectronic hybrid optical cable. Background Technology

[0002] Traditional hybrid fiber optic cables typically have a tensile strength of <100kN, which cannot meet the construction requirements for deep burial and suspension spans, and their compressive strength is also poor, at around 500N / cm². 2 Under pressure, they are prone to deformation, leading to attenuation of optical signals. In addition, traditional hybrid optical and electrical cables are relatively heavy (>50kg / km), making construction difficult. Therefore, improving the tensile and compressive strength of hybrid optical and electrical cables while reducing their weight has become one of the challenges in the industry. Summary of the Invention

[0003] To address the technical problems existing in the prior art, the purpose of this invention is to provide a high tensile and high compressive strength optoelectronic hybrid optical cable.

[0004] To achieve the above objectives and technical effects, the technical solution adopted by this invention is as follows: A high tensile and high compressive strength hybrid optical cable includes an outer sheath, a compressive protection layer, an electromagnetic shielding layer, and a cable core arranged sequentially from the outside to the inside. The cable core includes a central reinforcing unit and an optical transmission unit.

[0005] Furthermore, the outer protective layer is made of polyurethane material and Kevlar fiber, and is formed in one step by a composite extrusion process and coated on the outside of the pressure-resistant protective layer.

[0006] Furthermore, the composite extrusion process employs a two-stage screw extruder, with the first-stage screw temperature at 160-170℃ and the second-stage screw temperature at 140-150℃, and Kevlar fibers are introduced, while the die pressure is maintained at 8-12MPa.

[0007] Furthermore, the pressure-resistant protective layer includes a double-layer stainless steel strip layer disposed outside the electromagnetic shielding layer, with the gaps between the double-layer stainless steel strip layer filled with a composite filler made of nano-silica particles and silicone rubber, having a filling density of 0.8-0.9 g / cm³. 3 .

[0008] Furthermore, each stainless steel strip layer has a thickness of 0.15±0.01mm and is wound in a reverse spiral with an overlap rate of 30%±2%, and the particle size of the nano-silica particles is 60-90nm.

[0009] Furthermore, the electromagnetic shielding layer includes an aluminized polyester tape layer disposed on the outside of the photoelectric transmission unit and a plurality of ferrite magnetic rings disposed at intervals on the outside of the aluminized polyester tape layer.

[0010] Furthermore, the thickness of the aluminized polyester tape layer is 48-55 μm.

[0011] Furthermore, the ferrite magnetic ring is made of nickel-zinc ferrite material, with an initial permeability μi≥1500, a Curie temperature Tc≥200℃, and a fitting gap of 0.1-0.3mm between the inner diameter of the magnetic ring and the outer diameter of the tin-plated copper conductor.

[0012] Furthermore, the central reinforcing unit uses a glass fiber reinforced plastic rod with a diameter of 3-5mm, and its outer surface is spirally wound with aramid yarn at a winding angle of 40°-50° and a winding density of 80-100 yarns / cm.

[0013] Furthermore, the photoelectric transmission unit includes four sets of loose tubes symmetrically distributed outside the central reinforcing unit. Each set of loose tubes contains multiple optical fibers, and at least one optical fiber with a cross-sectional area of ​​2.5 ± 0.1 mm² is embedded in the gaps between the loose tubes in a twisted manner. 2 Tin-plated copper conductor.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1) The central reinforcing unit uses glass fiber reinforced plastic rods as a rigid skeleton to improve axial tensile stiffness. Aramid yarn is spirally wound on the outer surface of the glass fiber reinforced plastic rods, which helps to decompose the axial tensile force into yarn direction component force, maximize the utilization rate of fiber strength, and improve the tensile strength of the optoelectronic hybrid cable. 2) The double-layer stainless steel strips are spirally wound in reverse with an overlap rate of 30%±2%, which helps to create an interlocking effect between the two layers of stainless steel strips under pressure, resisting radial deformation, eliminating pressure weak points, and improving the pressure and bending resistance of the optical-electric hybrid cable. 3) The gaps between the double-layer stainless steel strips are filled with a composite filler made of nano-silica particles and silicone rubber, which helps to evenly distribute the pressure. The silicone rubber has a certain elasticity, which gives the composite filler a certain resilience and can absorb impact energy. 4) Kevlar fibers are randomly distributed in three dimensions in the polyurethane matrix, which inhibits crack propagation and improves the puncture resistance of the optoelectronic hybrid cable. 5) It integrates photoelectric signal transmission function, which is suitable for communication and power synchronous transmission scenarios in complex terrain environments such as seabed, mountains, and urban underground pipe corridors. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0016] The present invention will now be described in detail so that its advantages and features can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0017] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.

[0018] like Figure 1 As shown, a high tensile and high compressive strength hybrid optical cable includes an outer sheath 1, a compressive protection layer 2, an electromagnetic shielding layer 3, and a cable core arranged sequentially from the outside to the inside, wherein the cable core includes a central reinforcing unit and an optical transmission unit.

[0019] In some embodiments, the outer protective layer 1 is formed by a composite extrusion process using polyurethane material (hardness 90 Shore A±2) and Kevlar fiber (length 3-5mm, dosage 15-20wt%) and is coated on the outside of the pressure-resistant protective layer 2 in one step. The Kevlar fiber is randomly distributed in three dimensions in the outer protective layer 1.

[0020] In some more specific embodiments, the composite extrusion process uses a two-stage screw extruder. The first-stage screw temperature is 160-170°C to achieve polyurethane plasticization, and the second-stage screw temperature is 140-150°C to introduce Kevlar fibers. The die pressure is maintained at 8-12 MPa, thereby solving the problems of high-temperature degradation of polyurethane and Kevlar dispersion, and improving the puncture resistance of the optoelectronic hybrid optical cable.

[0021] In some embodiments, the pressure-resistant protective layer 2 includes a double-layer stainless steel strip layer disposed outside the electromagnetic shielding layer 3. Each stainless steel strip layer is 0.15±0.01mm thick and is wound in a reverse spiral with an overlap rate of 30%±2%. The gaps between the double-layer stainless steel strip layers are filled with a composite filler made of nano-silica particles (60-70wt%) with a particle size of 60-90nm and silicone rubber (30-40wt%), with a filling density of 0.8-0.9g / cm³. 3 .

[0022] In some specific embodiments, the preparation steps of the composite filler are as follows: First, the nano-silica particles were hydrophobically treated using conventional hydrophobic techniques. Then, they were dispersed in silicone rubber containing a silane coupling agent under vacuum conditions. After high-speed shear emulsification, the emulsified particles were injected into the gaps between the double-layer stainless steel strip and catalytically cured at 60-80℃. The addition of composite fillers resolved the conflict between low density and high compressive strength. The nano-silica particles formed a reinforced network structure, while the silicone rubber provided elastic recovery, synergistically enhancing the deformation resistance of the compressive protective layer 2.

[0023] In some embodiments, the electromagnetic shielding layer 3 includes an aluminized polyester tape layer 4 disposed on the outside of the photoelectric transmission unit and a plurality of ferrite magnetic rings 5 ​​evenly distributed on the outside of the aluminized polyester tape layer 4, which effectively suppresses high-frequency interference.

[0024] In some specific embodiments, the thickness of the aluminized polyester tape layer 4 is 48-55 μm.

[0025] In some more specific embodiments, the ferrite magnetic ring 5 is made of nickel-zinc ferrite material with an initial permeability μi≥1500 and a Curie temperature Tc≥200℃. The fit gap between the inner diameter of the magnetic ring and the outer diameter of the tin-plated copper conductor 9 is 0.1-0.3mm to avoid wear on the conductor.

[0026] In some embodiments, the central reinforcing unit is a glass fiber reinforced plastic rod 6 with a diameter of 3-5 mm, on the outer surface of which aramid yarn is spirally wound at a winding angle of 40°-50° and a winding density of 80-100 yarns / cm.

[0027] In some embodiments, the photoelectric transmission unit includes four sets of loose tubes 7 symmetrically distributed outside the central reinforcing unit. Each set of loose tubes 7 contains multiple optical fibers 8, and at least one optical fiber with a cross-sectional area of ​​2.5 ± 0.1 mm² is embedded in the gaps between the loose tubes 7 in a twisted manner. 2 9. Tin-plated copper conductor.

[0028] In some more specific implementations, fiber 8 is made of G.657.A2 fiber, and there are 12 fibers.

[0029] The beneficial effects of the present invention include at least the following: Synergistic tensile and compressive strength design: A three-level tensile strength system is formed by reverse spiral winding of glass fiber reinforced plastic rods (6 layers), aramid yarn, and double-layer stainless steel strips, resulting in a tensile strength of ≥180kN for the hybrid optical-electric cable; the reverse spiral winding of the double-layer stainless steel strips increases the compressive strength of the hybrid optical-electric cable to 1200N / cm. 2 ; Electromagnetic isolation technology: The electromagnetic shielding layer 3 is composed of an aluminum-plated polyester tape layer 4 and a ferrite magnetic ring 5, which reduces electromagnetic interference by 25dB. Lightweight design: Optimized material combination reduces cable weight to 38kg / km, which is 30% lighter than similar products.

[0030] Example 1 like Figure 1 As shown, a high tensile and high compressive strength hybrid optical cable includes an outer sheath 1, a compressive protection layer 2, an electromagnetic shielding layer 3, and a cable core arranged sequentially from the outside to the inside, wherein the cable core includes a central reinforcing unit and an optical transmission unit.

[0031] In this embodiment, the outer protective layer 1 is formed by a composite extrusion process using polyurethane material (hardness 90 Shore A) and Kevlar fiber (length 3mm, dosage 20wt%) and is coated on the outside of the pressure-resistant protective layer 2 in one step. The Kevlar fiber is randomly distributed in three dimensions in the outer protective layer 1.

[0032] The composite extrusion process uses a two-stage screw extruder. The first-stage screw temperature is 160℃ to achieve polyurethane plasticization, and the second-stage screw temperature is 150℃ to introduce Kevlar fibers. The die pressure is maintained at 10MPa, which solves the problems of high-temperature degradation of polyurethane and Kevlar dispersion, and improves the puncture resistance of the optoelectronic hybrid optical cable.

[0033] The pressure-resistant protective layer 2 includes a double-layer stainless steel strip layer disposed outside the electromagnetic shielding layer 3. Each stainless steel strip layer is 0.15 mm thick and is wound in a reverse spiral with a 30% overlap. The gaps between the double stainless steel strip layers are filled with a composite filler made of 60 wt% nano-silica particles with a particle size of 60 nm and 40 wt% silicone rubber, with a filling density of 0.8 g / cm³. 3 .

[0034] In some specific embodiments, the preparation steps of the composite filler are as follows: First, the nano-silica particles were hydrophobically treated using conventional hydrophobic techniques. Then, they were dispersed in silicone rubber containing a silane coupling agent under vacuum conditions. After high-speed shear emulsification, they were injected into the gaps between the double-layer stainless steel strip and catalytically cured at 60°C. The addition of composite fillers resolved the conflict between low density and high compressive strength. The nano-silica particles formed a network structure for reinforcement, while the silicone rubber provided elastic recovery, synergistically enhancing the deformation resistance of the compressive protective layer 2.

[0035] The electromagnetic shielding layer 3 includes an aluminized polyester tape layer 4 disposed on the outside of the photoelectric transmission unit and four ferrite magnetic rings 5 ​​evenly distributed on the outside of the aluminized polyester tape layer 4, which effectively suppresses high-frequency interference.

[0036] The thickness of the aluminized polyester tape layer 4 is 50μm.

[0037] The ferrite magnetic ring 5 is made of nickel-zinc ferrite material with an initial permeability μi≥1500 and a Curie temperature Tc≥200℃. The fit gap between the inner diameter of the magnetic ring and the outer diameter of the tin-plated copper conductor 9 is 0.3mm to avoid wear on the conductor.

[0038] The central reinforcing unit uses a 5mm diameter glass fiber reinforced plastic rod 6, with aramid yarn spirally wound on its outer surface at a winding angle of 45° and a winding density of 80 yarns / cm.

[0039] The optoelectronic transmission unit includes four sets of loose tubes 7 symmetrically distributed outside the central reinforcing unit. Each set of loose tubes 7 contains 12 optical fibers 8. The optical fibers 8 are G.657.A2 optical fibers, and four fibers with a cross-sectional area of ​​2.5 mm² are embedded in the gaps between the loose tubes 7 in a twisted manner. 2 9. Tin-plated copper conductor.

[0040] Any parts or structures not specifically described in this invention can be made using existing technologies or products, and will not be elaborated upon here.

[0041] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A high tensile and high compressive strength hybrid optical cable, characterized in that, It includes, from the outside to the inside, an outer sheath, a pressure-resistant protective layer, an electromagnetic shielding layer, and a cable core, wherein the cable core includes a central reinforcing unit and a photoelectric transmission unit; The pressure-resistant protective layer includes a double-layer stainless steel strip layer disposed on the outside of the electromagnetic shielding layer. The gap between the double-layer stainless steel strip layer is filled with a composite filler made of nano-silica particles and silicone rubber, with a filling density of 0.8-0.9 g / cm3. Each stainless steel strip layer has a thickness of 0.15±0.01mm and is wound in a reverse spiral with an overlap rate of 30%±2%. The particle size of the nano-silica particles is 60-90nm. The central reinforcing unit uses a glass fiber reinforced plastic rod with a diameter of 3-5mm, and its outer surface is spirally wound with aramid yarn at a winding angle of 40°-50° and a winding density of 80-100 yarns / cm. The photoelectric transmission unit includes four sets of loose tubes symmetrically distributed on the outside of the central reinforcing unit. Each set of loose tubes contains multiple optical fibers, and at least one tin-plated copper conductor with a cross-sectional area of ​​2.5±0.1mm2 is embedded in the gap between the loose tubes in a twisted manner.

2. The high tensile and high compressive strength hybrid optical cable according to claim 1, characterized in that, The outer protective layer is made of polyurethane material and Kevlar fiber, and is formed in one step by a composite extrusion process and wrapped on the outside of the pressure-resistant protective layer.

3. The high tensile and high compressive strength hybrid optical cable according to claim 2, characterized in that, The composite extrusion process uses a two-stage screw extruder. The first-stage screw temperature is 160-170℃, the second-stage screw temperature is 140-150℃, and Kevlar fibers are introduced. The die pressure is maintained at 8-12MPa.

4. The high tensile and high compressive strength hybrid optical cable according to claim 1, characterized in that, The electromagnetic shielding layer includes an aluminized polyester tape layer disposed on the outside of the photoelectric transmission unit and a number of ferrite magnetic rings disposed at intervals on the outside of the aluminized polyester tape layer.

5. The high tensile and high compressive strength hybrid optical cable according to claim 4, characterized in that, The thickness of the aluminized polyester tape layer is 48-55 μm.

6. The high tensile and high compressive strength hybrid optical cable according to claim 4, characterized in that, The ferrite magnetic ring is made of nickel-zinc ferrite material, with an initial permeability μi≥1500 and a Curie temperature Tc≥200℃.

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