Watertight towing photoelectric composite cable and manufacturing method thereof

Abstract

The watertight towing photoelectric composite cable comprises a middle wire core and a protective layer, the middle wire core comprises a signal wire core formed by twisting a plurality of first metal wires, a power wire core formed by twisting a plurality of second metal wires and an optical unit, a tinned copper wire braided shielding layer is adopted outside the signal wire core, and a shielding layer is adopted outside the tinned copper wire braided shielding layer. The shielding layer is arranged outside the signal wire core, the braiding density is 85%, the outside of the shielding layer is wrapped and isolated by a polyester film, the outside of the power wire core is provided with a copper-plastic composite film which can melt and expand after being heated, the outer layers of the signal wire core, the power wire core and the optical unit are wrapped by a non-woven fabric tape, and the protective layer comprises an aramid fiber armor layer and a polyurethane outer sheath. The cable has good anti-interference performance and water-blocking capability.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a watertight towed optoelectronic composite cable and a manufacturing method thereof. Background Art

[0002] In maritime communications, underwater communications play a pivotal role. Therefore, accelerating the development of underwater communications has become a common concern of the international community. With the continuous development of modern submarine communication technology, submarine-towed communication buoys have gradually become an important means of communication for navies of various countries. Cables are the core components of underwater communication buoys. All signals and energy in the communication system must be transmitted through them. Therefore, the cables are required to have high tensile strength, low density and excellent watertightness.

[0003] The waterproof performance of the cables with optical-electrical composite structures and materials currently used cannot meet the needs of deep-sea operations. During their service, they have problems such as insufficient breaking strength and unstable electrical performance during operation; they have poor bending performance, corrosion resistance, wear resistance and repeated retraction and release capabilities. In addition, when used for a long time, the cables are prone to entanglement and mutual interference.

[0004] For example, the patent with application number CN201810378906.5 discloses an optoelectronic composite cable and a method for manufacturing an optoelectronic composite cable. The optical fiber is wrapped with resin tape, which has poor waterproof performance and cannot work underwater for a long time. Summary of the invention

[0005] The invention mainly solves the problem of poor waterproof performance of the optoelectronic composite cable in the prior art and provides a watertight towing optoelectronic composite cable with good waterproof performance.

[0006] The above technical problems of the present invention are mainly solved by the following technical solutions: a watertight towed optoelectronic composite cable, comprising an intermediate core and a protective layer, wherein the intermediate core comprises a signal core formed by twisting multiple first metal wires, a power core formed by twisting multiple second metal wires, and an optical unit, the outside of the signal core adopts a tinned copper wire braided shielding layer with a braiding density of 85%, the outside of the shielding layer is wrapped with a polyester film for isolation, the outside of the power core is provided with a copper-plastic composite film that can melt when heated, a non-woven fabric tape is provided on the outer layer of the signal core, the power core and the optical unit for wrapping, and the protective layer comprises an aramid armor layer and a polyurethane outer sheath.

[0007] Preferably, the first metal wire is a 0.20 mm tinned copper wire.

[0008] Preferably, the second metal wire is a 0.26 mm tinned copper wire.

[0009] Preferably, the signal wire core is insulated with a fluoroplastic insulation layer, filled once with a water-blocking aramid rope and filled twice with a water-blocking glue, the twisting pitch is 20-24 mm, and the outside is wrapped with an aluminum-plastic composite tape.

[0010] Preferably, the optical unit comprises at least one optical fiber and an armor reinforcement layer arranged outside the optical fiber, and the armor reinforcement layer is woven with water-blocking aramid with a pitch of 16-20 mm.

[0011] Preferably, the middle wire core is further provided with a filling layer, and the filling layer comprises a plurality of polyethylene strips and a water-blocking sealant.

[0012] Preferably, the aramid armor layer is sparsely wound with 28 coils, each coil having 3 water-blocking aramid fibers, and is externally wrapped with a 0.015*25mm polyester tape.

[0013] The present invention also provides a method for manufacturing a watertight towed optoelectronic composite cable, comprising the following steps:

[0014] Step 1: Bundle tinned copper wires with a length of 0.26 mm in a 1+6+12 arrangement to obtain a power line core conductor, and bundle tinned copper wires with a length of 0.20 mm in a 1+6+12 arrangement to obtain a signal line core conductor. During the twisting process, each tinned copper wire is coated with a water-blocking sealant.

[0015] Step 2: Inject the fluoroplastic insulation layer into a plastic single-screw extruder to cover the power cord core conductor and the signal cord core conductor with the insulation layer;

[0016] Step 3: Fill the signal wire core conductor with water-blocking aramid rope and twist it into a wire core. Wrap it with aluminum-plastic composite tape on the outside. Use water-blocking glue to fill the gaps between the core wires when twisting them into cables.

[0017] Step 4: Use tinned copper wire braided shielding layer on the outside of the signal line core with a braiding density of 85%. Use polyester film to wrap and isolate the outside of the shielding layer.

[0018] Step 5: Use water-blocking aramid fiber to braid armor outside the optical fiber to strengthen and form an optical unit;

[0019] Step 6: Vertically wrap a layer of copper-plastic composite film on the outside of the power cord core;

[0020] Step 7: The signal core, power core and optical unit are integrated into a cable. Five φ2.0 mm polyethylene strips are filled in the solid area of ​​the cable gap. Water-blocking sealant is filled in the cabling process. The cable is wrapped with non-woven tape and the outer layer is reinforced with twisted water-blocking aramid fiber.

[0021] Step 8: After drying the polyurethane sheath material at 60-70°C for 6 hours, inject it into a plastic single-screw extruder to complete the extrusion of the polyurethane outer sheath.

[0022] The beneficial effects of the present invention are as follows: fluoroplastics with superior electrical properties and high dielectric strength are used as the insulation of the high-voltage core wire, so that the cable can meet the high-voltage safety of 500V for long-term use, and by designing the extrusion thickness of the fluoroplastic insulation and the twisted twist pitch, the attenuation is reduced to below 3dB / 100m at 1MHz, and the cable has good anti-interference performance; the outer sheath adopts black high-strength hydrolysis-resistant polyether polyurethane material, which has excellent seawater corrosion resistance, excellent wear resistance, and better salt spray resistance and mildew resistance, and adopts water-blocking aramid to braid armored reinforced optical fiber to improve the breaking ability and water-blocking ability of the optical unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of an optoelectronic composite cable according to an embodiment of the present invention.

[0024] In the figure, 1, power line core, 2, signal line core, 3, water-blocking aramid rope, 4, polyethylene tape, 5, copper-plastic composite film, 6, tinned copper wire, 7, polyester film, 8, optical unit, 9, non-woven fabric tape, 10, aramid armor layer, and 11, polyurethane outer sheath. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0026] Embodiment: A watertight towed optoelectronic composite cable, such as Figure 1 As shown, it includes an intermediate core and a protective layer. The intermediate core includes a signal core 2 formed by twisting multiple first metal wires, a power core 1 formed by twisting multiple second metal wires, and an optical unit 8. The outside of the signal core uses a tinned copper wire 6 to weave a shielding layer with a weaving density of 85%. The outside of the shielding layer is wrapped with a polyester film 7 for isolation. The outside of the power core is provided with a copper-plastic composite film 5 that can be melted by heat. A non-woven fabric tape 9 is provided on the outer layer of the signal core, the power core, and the optical unit for wrapping. The protective layer includes an aramid armor layer 10 and a polyurethane outer sheath 11. The intermediate core is also provided with a filling layer, which includes multiple polyethylene strips 4 and a water-blocking sealant.

[0027] In order to meet the anti-interference performance during deep-sea operations, the shielding layer of the photoelectric composite towing cable signal line is woven with aluminum-plastic composite tape and tinned copper wire, with a weaving density of ≥80%, which improves the anti-interference performance. The power line is longitudinally wrapped with copper-plastic composite tape, which can increase the current carrying capacity of the power line on the one hand; on the other hand, the plastic layer of the copper-plastic composite film of this structure melts and expands when heated, blocking the gap and playing a waterproof role.

[0028] The signal core is insulated with a fluoroplastic insulation layer, filled with a water-blocking aramid rope 3 for the first time and filled with a water-blocking glue for the second time, with a twisting pitch of 20-24mm and wrapped with an aluminum-plastic composite tape on the outside. In order to meet the watertightness requirements during deep-sea operations, the optoelectronic composite towing cable is processed from the following aspects: conductor twisting, insulation core group twisting, shielding core group braiding, wrapping, cable core twisting, and outer braided tensile layer are all coated with water-blocking glue; in terms of material selection: water-blocking aramid, water-blocking sealant and copper-plastic composite tape are used. The cable as a whole has good watertightness and can withstand a longitudinal water pressure of 7.0MPa for more than 2 hours.

[0029] The first metal wire is a 0.20 mm tinned copper wire.

[0030] The second metal wire is a 0.26 mm tinned copper wire.

[0031] The optical unit comprises at least one optical fiber and an armor reinforcement layer arranged outside the optical fiber, wherein the armor reinforcement layer is woven with water-blocking aramid with a pitch of 16-20 mm.

[0032] In order to improve the stability and efficiency of signal transmission during deep-sea operations, two G651A1 multimode optical fibers are used as optical units and added to the cable core. The attenuation of this optical fiber at a wavelength of 1310nm is ≤0.4dB / km. The optical unit is armored with a spiral stainless steel tube, and the armored unit is reinforced with a water-blocking 1610dtex twisted water-blocking aramid braid. By adjusting the aramid armoring method and the number of aramid roots, the breaking capacity and water-blocking capacity of the optical unit are improved. In addition, using optical fiber to transmit signals instead of insulating cores can effectively reduce the outer diameter and weight of the cable and improve the confidentiality of the signal.

[0033] The aramid armor layer is sparsely wound with 28 coils, 3 water-blocking aramid fibers in each coil, and is wrapped with 0.015*25mm polyester tape on the outside.

[0034] The armor layer uses 3220dtex twisted water-blocking aramid as the tensile reinforcement layer. 3220dtex twisted water-blocking aramid is a new high-tech synthetic fiber with ultra-high strength, high modulus, high temperature resistance, acid and alkali resistance, light weight, insulation, anti-aging and other advantages, which improves the cable's anti-breaking tensile force. By adjusting the aramid armoring method and the number of aramid roots, the cable can remain unbroken for 30 minutes at a working tension of 18kN, and the breaking force is ≥90kN; in addition, the super absorbent in the water-blocking yarn will quickly absorb water when it comes into contact with water, expand rapidly, and wrap the water in its mesh structure, achieving the purpose of water blocking.

[0035] A method for manufacturing a watertight towed optoelectronic composite cable comprises the following steps:

[0036] Step 1: Bundle tinned copper wires with a length of 0.26 mm in a 1+6+12 arrangement to obtain a power line core conductor, and bundle tinned copper wires with a length of 0.20 mm in a 1+6+12 arrangement to obtain a signal line core conductor. During the twisting process, each tinned copper wire is coated with a water-blocking sealant.

[0037] Step 2: Inject the fluoroplastic insulation layer into a plastic single-screw extruder to cover the power cord core conductor and the signal cord core conductor with the insulation layer;

[0038] Step 3: Fill the signal wire core conductor with water-blocking aramid rope and twist it into a wire core. Wrap it with aluminum-plastic composite tape on the outside. Fill the gaps between the core wires with water-blocking glue when twisting them into cables. The aluminum side faces outward, the twist direction is left-handed, and the twist pitch is 22±2mm.

[0039] Step 4: Use tinned copper wire braided shielding layer on the outside of the signal line core, with a braiding density of 85%, and use polyester film to wrap and isolate the outside of the shielding layer; the wrapping coverage rate is 15%, and the outer diameter is 3.62±0.30mm;

[0040] Step 5: Use water-blocking aramid fiber to braid and armor the outside of the optical fiber to form an optical unit; the optical unit is reinforced with 8 1610dtex water-blocking aramid fibers with a pitch of 18±2mm and an outer diameter of 1.90±0.10mm (the optical unit contains 1 G657A2 single-mode optical fiber, which is armored with a spiral stainless steel tube with an outer diameter of 1.1±0.1mm);

[0041] Step 6: Wrap a layer of copper-plastic composite film on the outside of the power cord core; outer diameter 2.1±0.30: on the one hand, it can increase the current carrying capacity of the power cord; on the other hand, the plastic layer of the copper-plastic composite film in this structure will melt and expand when heated, blocking the gap and playing a waterproof role;

[0042] Step 7: The signal core, power core and optical unit are integrated into a cable. Five φ2.0mm polyethylene strips are filled in the solid area of ​​the cable gap. Water-blocking sealant is filled in the cabling process. The non-woven tape is wrapped, and the outer layer is reinforced with twisted water-blocking aramid fiber. The twist direction of the non-woven tape is right-handed, the cable pitch is 70±4mm, and the outer diameter is 7.70±0.20mm. The outer layer of the cable is reinforced with 28 coils, 3 1610dtex twisted water-blocking aramid fiber per coil (right-hand twisting, pitch 20mm); the armor is wrapped with 0.015*25mm polyester tape in the right direction, with a coverage rate of>15%, and an outer diameter of 8.60±0.20mm.

[0043] Step 8: After drying the polyurethane sheath material at 60-70℃ for 6 hours, inject it into the plastic single screw extruder to complete the extrusion of the polyurethane outer sheath. The outer diameter of the outer sheath is 12.00±0.30mm.

[0044] The optoelectronic composite towing cable of the present invention adopts excellent process design and advanced manufacturing means, uses polyurethane as the sheath, and winds water-blocking aramid fiber as the tensile layer, which ensures that the cable has excellent dynamic bending resistance and allows the cable to be repeatedly retracted and used.

[0045] The present invention adopts fluoroplastics with superior electrical properties and high dielectric strength as the insulation of the strong electric core wire, so that the cable can meet the strong electric safety of long-term use voltage of 500V, and by designing the fluoroplastic insulation extrusion thickness and twisted twist pitch, the attenuation is reduced to below 3dB / 100m at 1MHz. The outer sheath adopts black high-strength hydrolysis-resistant polyether polyurethane material, which has excellent seawater corrosion resistance, excellent wear resistance, and better salt spray resistance and mildew resistance.

[0046] The patent of this invention is developed according to relevant standards such as GB / T 4910-2009, GB / T 17737.1-2000, GJB 1428B-2009, and GJB1916-1994. The transmission of electrical energy is combined with the efficient signal transmission of optical fiber, so that it has a strong information throughput capacity and can transmit data faster. In an underwater environment of 300 meters deep, it can reach a breaking force of 8kN, solving the problem of water-blocking and sealing without leakage under the longitudinal and transverse water pressure of the towed optoelectronic composite tow cable. It has the characteristics of high tensile strength, bending resistance, oil resistance, and aging resistance. After multiple winding and release, its optical and electrical properties do not change significantly. As an important component of underwater maintenance detection equipment and seabed positioning equipment, it can effectively ensure the power supply of the probe and the transmission of detection signals. It successfully solves the signal transmission problem of multiple cables in deep water, making the cable have the characteristics of one cable for multiple uses, which can be applied to submarine communications, underwater towing communication buoy systems, underwater robots and other systems.

[0047] The above-described embodiment is only a preferred solution of the present invention and does not limit the present invention in any form. There are other variations and modifications without exceeding the technical solution described in the claims.

Claims

1. A watertight towed optoelectronic composite cable, characterized in that: include: An intermediate wire core and a protective layer, wherein the intermediate wire core comprises a signal wire core formed by twisting a plurality of first metal wires, a power wire core formed by twisting a plurality of second metal wires, and an optical unit, the exterior of the signal wire core adopts a tinned copper wire braided shielding layer with a braiding density of 85%, the exterior of the shielding layer is wrapped with a polyester film for isolation, the exterior of the power wire core is provided with a copper-plastic composite film that can expand when heated, a non-woven fabric tape is provided on the outer layer of the signal wire core, the power wire core, and the optical unit for wrapping, and the protective layer comprises an aramid armor layer and a polyurethane outer sheath.

2. A watertight towed optoelectronic composite cable according to claim 1, characterized in that: The first metal wire is a 0.20 mm tinned copper wire.

3. A watertight towed optoelectronic composite cable according to claim 1 or 2, characterized in that: The second metal wire is a 0.26 mm tinned copper wire.

4. A watertight towed optoelectronic composite cable according to claim 1 or 2, characterized in that: The signal line core is insulated with a fluoroplastic insulation layer, filled with a water-blocking aramid rope for a primary filling and a water-blocking glue for a secondary filling, the twisting pitch is 20-24mm, and the outer side is wrapped with an aluminum-plastic composite tape.

5. The watertight towed optoelectronic composite cable according to claim 1, characterized in that: The optical unit comprises at least one optical fiber and an armor reinforcement layer arranged outside the optical fiber, and the armor reinforcement layer is woven with water-blocking aramid with a pitch of 16-20 mm.

6. The watertight towed optoelectronic composite cable according to claim 1, characterized in that: The middle wire core is also provided with a filling layer, and the filling layer includes a plurality of polyethylene rubber strips and a water-blocking sealant.

7. The watertight towed optoelectronic composite cable according to claim 1, characterized in that: The aramid armor layer is sparsely wound with 28 coils, each coil having 3 water-blocking aramid fibers, and is wrapped externally with a 0.015*25mm polyester tape.

8. A method for manufacturing the cable according to claims 1-7, characterized in that: The following steps are involved: Step 1: Bundle tinned copper wires with a length of 0.26 mm in a 1+6+12 arrangement to obtain a power line core conductor, and bundle tinned copper wires with a length of 0.20 mm in a 1+6+12 arrangement to obtain a signal line core conductor. During the twisting process, each tinned copper wire is coated with a water-blocking sealant. Step 2: Inject the fluoroplastic insulation layer into a plastic single-screw extruder to cover the power cord core conductor and the signal cord core conductor with the insulation layer; Step 3: Fill the signal wire core conductor with water-blocking aramid rope and twist it into a wire core. Wrap it with aluminum-plastic composite tape on the outside. Use water-blocking glue to fill the gaps between the core wires when twisting them into cables. Step 4: Use tinned copper wire braided shielding layer on the outside of the signal line core with a braiding density of 85%. Use polyester film to wrap and isolate the outside of the shielding layer. Step 5: Use water-blocking aramid fiber to braid armor outside the optical fiber to strengthen and form an optical unit; Step 6: Vertically wrap a layer of copper-plastic composite film on the outside of the power cord core; Step 7: The signal core, power core and optical unit are integrated into a cable. Five φ2.0 mm polyethylene strips are filled in the solid area of ​​the cable gap. Water-blocking sealant is filled in the cabling process. The cable is wrapped with non-woven tape and the outer layer is reinforced with twisted water-blocking aramid fiber. Step 8: After drying the polyurethane sheath material at 60-70°C for 6 hours, inject it into a plastic single-screw extruder to complete the extrusion of the polyurethane outer sheath.

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