Cable, cable assembly, and method of oil filling for deep submergence vehicles

Abstract

The present application relates to the technical field of cable, in particular to a cable for deep diving equipment, a cable assembly and an oil filling method, comprising: a core, two ends of the core are electrically connected to an electrical equipment and a power supply equipment respectively, the power supply equipment and the electrical equipment are arranged to be in a liquid pressure medium in a working mode; a sheath, the sheath is arranged as a hollow tubular, an inner wall of the sheath extends inwardly to form a cavity, the core is arranged to pass into the cavity, a first end of the sheath is sealingly connected to the electrical equipment, and a second end of the sheath is sealingly connected to the power supply equipment, so that the cavity forms a sealed cavity. When the ordinary cable is used in deep sea or high pressure medium, the cable is extruded and deformed by the hydraulic pressure, which causes damage to the internal structure of the cable. The cable of the present application fills oil in the sheath to balance the pressure difference between the inside and outside of the sheath, thereby solving the reliability problem of the cable in high pressure medium.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cables, in particular to a cable for deep diving equipment, a cable assembly and an oil filling method. BACKGROUND

[0002] With the exploration of the ocean by mankind, various submersible robots, underwater vehicles and underwater fixed observation equipment have become important means of understanding the ocean. Some parts of the submersibles and underwater fixed observation equipment need to be connected by cables.

[0003] Most of the cables currently used are solid-filled, which have the problems of low reliability, large bending stress, many types and poor standardization when working in deep water. In addition, some parts are oil-filled structures, and the use of solid-filled cables directly requires joint longitudinal sealing of the cables, which not only complicates the construction procedure but also is not conducive to maintenance.

[0004] As shown in patent document 1, the oil-filled waterproof cable is applied in high-humidity environments such as urban underground or underwater. Its scheme adds a large-viscosity ointment in the sheath for water resistance, but at the same time, due to the large viscosity of the ointment, it cannot guarantee the filling degree, and generally can only fill 90%. When applied in deep-sea environments, it will be flattened, causing damage to the cable structure.

[0005] Prior art documents:

[0006] Patent document 1 CN105304192A - an oil-filled waterproof cable SUMMARY

[0007] In view of the defects and deficiencies of the prior art underwater cable, the present application aims to balance the pressure inside and outside the cable by filling pressure medium inside, so as to reduce the structural stress of the cable and the sealing pressure of the joint.

[0008] The present application aims to provide a cable for deep diving equipment, comprising:

[0009] a core, both ends of the core being electrically connected to a power-consuming device and a power supply device, the power supply device and the power-consuming device being arranged to be in a liquid pressure medium in a working mode;

[0010] a sheath, the sheath being arranged as a hollow tube, the inner wall of the sheath extending inwardly to form a cavity for accommodating the core passing into the cavity, the first end of the sheath being sealingly connected to the power-consuming device, and the second end being sealingly connected to the power supply device, so that the cavity forms a sealed cavity;

[0011] The cavity is filled with insulating oil, and the insulating oil fills the cavity. The insulating oil is liquid, so that the sheath is supported by the insulating oil filled in the cavity to prevent the liquid pressure medium outside the sheath from compressing the volume of the cavity, so that the pressure inside and outside the sheath is balanced.

[0012] Preferably, the sheath comprises an inner sheath, a reinforcement layer and an outer sheath, the inner sheath is formed by tube extrusion, the reinforcement layer is coated on the outer wall of the inner sheath, and the outer sheath is extruded on the outer wall of the reinforcement layer.

[0013] Preferably, the inner sheath comprises a nitrile rubber material layer or a polycarbonate material layer.

[0014] Preferably, the reinforcement layer includes a braided layer, and the braided layer includes an aramid braided layer.

[0015] Preferably, the outer sheath comprises a layer of polyurethane material.

[0016] Preferably, the core comprises an electrical conductor and / or an optical fiber.

[0017] Preferably, the insulating oil includes dimethyl silicone oil.

[0018] A second aspect of the present invention provides a technical solution, a cable assembly, characterized in that it includes the above-mentioned cable for deep-sea submersible equipment, and further includes:

[0019] connectors connected to both ends of the cable;

[0020] The connector is fixedly connected to the sheath, and the connector is used to connect to the electrical connection interface of the power supply device and the power-consuming device, so that a closed cavity is formed in the sheath between the power supply device and the power-consuming device.

[0021] Preferably, the connector is connected to the wire core, and the connector blocks both ends of the cavity, so that a sealed cavity is formed in the two connectors.

[0022] A third aspect of the present invention provides a technical solution for the oil filling method of the above-mentioned cable for deep-sea submersible equipment, comprising the following steps:

[0023] Step 1: Make the sheath structure: use the extrusion tube method to extrude the inner sheath, make a reinforcement layer on the outside of the inner sheath, and extrude the outer sheath outside the reinforcement layer to form the sheath structure;

[0024] Step 2: Construct a sealed cavity: insert the wire core into the sheath structure, connect the sheath and both ends of the wire core to the sealed joint or power supply / use equipment, so that a sealed cavity is formed in the sheath;

[0025] In the process of constructing the sealed cavity, one end of the sheath is sealed first, and oil is injected into the cavity inside the sheath from the other end. After the cavity is filled, the other end of the sheath is sealed.

[0026] Preferably, in step 1, the inner sheath is extruded using polycarbonate, and the extruded extrusion head includes a film sleeve and a mold core, an extrusion channel is formed between the film sleeve and the mold core, wherein the inner diameter of the mold sleeve is 1 to 1.5 mm larger than the outer diameter of the inner sheath, and the inner diameter of the mold core is 1 to 1.5 mm smaller than the outer diameter of the inner sheath.

[0027] Preferably, in step 1, the outer sheath is extruded using polyurethane, and the extruded extrusion head includes a film sleeve and a mold core, an extrusion channel is formed between the film sleeve and the mold core, the difference between the inner diameter of the mold sleeve and the outer diameter of the outer sheath is in the range of -0.3 to +0.3 mm, and the inner diameter of the mold core is 0.3 to 0.5 mm larger than the maximum outer diameter before extrusion.

[0028] Compared with the prior art, the advantages of the present invention are:

[0029] When ordinary cables are used in deep sea or high pressure media, especially signal / power cables between deep-sea submersibles and their released detectors, they can be suddenly squeezed and deformed by high pressure, causing damage to the internal structure of the cable, resulting in cable fire or power transmission failure. The cable of the present invention fills the sheath with oil to balance the pressure difference between the inside and outside of the sheath, thus solving the reliability problem of the cable in high pressure media.

[0030] Ordinary underwater cables need to be customized according to the number of optical fibers, and the outer diameters of the manufactured cables vary. Not only do they require the use of multiple extrusion heads during production, but the matching connectors also need to be specially customized with different interfaces. This lacks versatility and is cumbersome to maintain. The cable of the present invention can integrate optical fibers of different specifications and core numbers into a sheath of the same diameter, making it not only simple to manufacture but also easy to replace, maintain, and assemble cable accessories, making it more versatile.

[0031] The cable of the present invention is composed of an outer sheath, an inner sheath, a reinforcement layer, a wire core, etc. When used underwater, the outer sheath is resistant to seawater, and the inner sheath is resistant to corrosion by insulating oil. It can be used reliably for a long time. Due to the presence of the reinforcement layer, it has certain resistance to stretching, tearing, scratching, and external force impact, and has good flexibility, so that the detector can perform flexible movements. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in various figures may be represented by the same reference numeral. For the sake of clarity, not every component is labeled in every figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, in which:

[0033] Figure 1 Schematic diagram of the cross-sectional structure of a cable for deep-sea diving equipment shown in the present invention;

[0034] Figure 2 is a schematic diagram of the connector structure of the cable assembly shown in the present invention;

[0035] Figure 3 is a schematic diagram of a connector structure of a cable assembly according to another embodiment of the present invention;

[0036] Figure 4 It is a production flow chart of the cable for deep-sea diving equipment shown in the present invention. DETAILED DESCRIPTION

[0037] In order to better understand the technical content of the present invention, specific embodiments are given and described below with reference to the accompanying drawings.

[0038] In deep-sea environments, communication and power transmission between devices still need to rely on cables, but the current armored cables still cannot meet the requirements in terms of flexibility and pressure resistance. Therefore, this application aims to propose a cable for deep-sea equipment, which is designed for deep-sea pressure environments, especially power / signal cables between deep-sea detectors and detection equipment. It has better pressure resistance while ensuring flexibility and tensile strength.

[0039]

Cables for deep-sea equipment

[0040] Combine Figure 1 As shown, the cable proposed by the present invention aims to solve the reliability problem of the cable in high-pressure media by filling oil inside the sheath to balance the pressure difference between the inside and outside of the sheath. The cable for deep-sea diving equipment includes:

[0041] Wire core;

[0042] The sheath is configured to be in the shape of a hollow tube, wherein the space extending inward from the inner wall of the sheath forms a cavity 101 for accommodating the wire core penetrating the cavity 101;

[0043] The cavity 101 is filled with insulating oil 4 , and the insulating oil fills up the cavity 101 so that the wire core is suspended in the cavity. The insulating oil 4 is liquid.

[0044] In this way, since there is pressure medium inside and outside the sheath, the inside of the sheath is insulating oil 4 and the outside of the sheath is seawater, the pressure difference inside and outside the sheath can be balanced, thereby improving the sealing and structural reliability of the cable in the deep sea. In addition, the cable does not have an armor layer and has better flexibility, which is suitable for the flexible maneuverability of detectors in deep-sea detection environments.

[0045] Furthermore, both ends of the wire core are electrically connected to the power-consuming device and the power-supplying device respectively, and the power-supplying device and the power-consuming device are configured to be in a liquid pressure medium in a working mode.

[0046] Optionally, the power supply equipment is a submersible, such as a deep-sea exploration submersible or a deep-sea salvage submersible, which usually conducts exploration and salvage operations at a water depth of 3000-8000m; the electrical equipment is an accessory suitable for the submersible, that is, the detection equipment, which is usually a detection equipment integrating underwater television cameras, sonar and salvage manipulators. The submersible provides power and control signals for the detection equipment to complete deep-sea exploration or salvage tasks.

[0047] like Figure 1 As shown, the sheath is preferably a three-layer structure, wherein the outer sheath 3, the reinforcement layer 2 and the inner sheath 1 form a hollow tube structure, wherein the outer sheath 3, the reinforcement layer 2 and the inner sheath 1 form a tube wall with a certain wall thickness, and a cavity 101 is formed within the inner diameter of the inner sheath 1, and the cavity 101 is filled with insulating oil 4. In this way, the inner layer of the inner sheath 1 is insulating oil, and the outer layer of the outer sheath 3 is seawater. The pressure difference between the inside and outside of the sheath structure is small, and no large pressure is generated on the sheath structure itself.

[0048] Optionally, the inner sheath 1 is made of a nitrile rubber layer or a polycarbonate layer, which is not easily corroded by insulating oil, thereby ensuring that the inner sheath 1 has a long service life.

[0049] In a specific embodiment, the polycarbonate material layer is formed by extruding a PC (polycarbonate) mixture, and the extrusion raw materials are vulcanized by vulcanizing raw materials including the following components, where each component is calculated by weight: 100 parts by weight of PC (polycarbonate), 5-30 parts by weight of polyester plasticizer, 0.5-3.5 parts by weight of vulcanizing agent, and 28-72 parts by weight of carbon black.

[0050] Optionally, the outer sheath 3 is made of a polyurethane material layer. Polyether polyurethane is resistant to hydrolysis and chemical corrosion in fresh water, sea water or high humidity environments, can effectively resist wind and rain erosion, has low friction or anti-stickiness when in contact with water, and the cables contact and slide with each other with low movement resistance.

[0051] Specifically, in order to enhance the tensile strength of the sheath structure, the reinforcement layer 2 is one of a fiber filament braided layer, a metal wire braided layer or a fiber metal multifilament braided layer.

[0052] For example, a fiber woven layer is formed by weaving single fibers or mixed fibers with good tensile strength and flexibility, such as aramid fibers, polyester fibers or carbon fibers.

[0053] In order to further improve the impact resistance of the cable, optionally, the reinforcement layer 2 is a braided layer formed by braiding fine steel wires to improve the strength and anti-scratch ability of the cable.

[0054] Furthermore, in order to balance impact resistance and flexibility, the reinforcement layer 2 is a fiber metal multifilament braided layer, for example, a braided layer formed by a multifilament structure formed by twisting aramid fibers and steel wires.

[0055] In other embodiments, when higher flexibility is not required, the reinforcement layer 2 may be formed by longitudinally wrapping a copper strip or an aluminum strip.

[0056] Furthermore, the insulating oil 4 is silicone oil or mineral oil used in electrical equipment such as transformers. Since mineral oil has high fluidity and is not easily mixed with bubbles, its filling degree can be greater than 99.9%, so that the pressure medium in the cavity can balance the external seawater, maintaining the structural integrity of the cable under deep-sea high pressure without deformation.

[0057] When the insulating oil 4 is silicone oil, dimethyl silicone oil is preferably used. The filling degree of dimethyl silicone oil is greater than 99.9%, forming a liquid pressure medium, and is not easy to react with the internal filling wires or optical fibers or the inner sheath 1. It is filled inside the integrated cable to form a pressure balance structure with the external seawater, and keeps the internal electrical conductors of the cable insulated.

[0058] Optionally, the mineral oil includes cycloalkanes, aromatic hydrocarbons and alkanes, wherein, calculated by weight, cycloalkanes account for about 80%, and the remaining components are aromatic hydrocarbons and alkanes.

[0059] In other embodiments, the insulating oil may also be nano-modified transformer oil, aromatic synthetic oil insulating oil, or synthetic ester insulating oil.

[0060] Furthermore, the core in the sheath structure may be composed of an optical fiber 6 and an electrical conductor 5, or may be only one of the electrical conductor 5 and the optical fiber 6, and a certain number of electrical conductors and optical fibers may be freely placed according to actual conditions.

[0061] It should be understood that the optical fiber 6 may be any common single-mode or multi-mode optical fiber or a specialty optical fiber such as a panda fiber. The electrical conductor 5 includes a stranded conductor and an insulation layer. Optionally, the conductor of the electrical conductor 5 is formed by stranding 0.15 mm tinned copper single wires with a pitch-to-diameter ratio of 8 to 12 times to ensure conductor resistance, reduce bending stress, increase conductor flexibility, and achieve small outer diameter bending.

[0062] In this way, the above structure balances the pressure difference between the inside and outside of the sheath by filling oil inside the sheath, so that the cable can work in any water depth without being crushed by the water pressure.

[0063]

Cable Assembly

[0064] Combine Figure 2 As shown, the second aspect of the present invention proposes a technical solution, a cable assembly, including the above-mentioned cable for deep-sea equipment, and further comprising:

[0065] Connectors, which are connected to both ends of the cable;

[0066] The connector is fixedly connected to the sheath, and the connector is used to connect to the electrical connection interface of the power supply device and the power-consuming device, so that a closed cavity is formed in the sheath between the power supply device and the power-consuming device.

[0067] Combine Figure 2 As shown, the joint includes a vulcanized sealing layer 7, an outer shell 8 and an inner shell 10. The outer shell 8 and the inner shell 10 are fixed to one end of the cable and clamp the reinforcement layer 2 therein, so that the outer shell 8, the inner shell 10 and the reinforcement layer 2 are axially fixed. Furthermore, the vulcanized sealing layer 7 is wrapped around the outer wall of the outer shell 8 to fix the outer shell 8 and the outer sheath 3.

[0068] The outer shell 8 is constructed in the shape of an annular sleeve, and the inner wall of the right end is provided with a first annular inclined surface 81. The inner shell 10 is configured as an annular plate, and a protruding structure is provided at the left end. The protruding structure has a second annular inclined surface 101. When the outer shell 8 and the inner shell 10 are matched, the first annular inclined surface 81 and the second annular inclined surface 101 are close to each other and matched.

[0069] In a specific embodiment, when the connector is connected to both ends of the cable, the outer sheath 3 of the sheath structure needs to be cut short to expose the reinforcement layer 2 and the inner sheath 1. The outer shell 8 is first sleeved on the end of the outer sheath 3, and then the inner shell 10 is sleeved on the end of the cable. The end of the reinforcement layer 2 is squeezed by the second annular slope 101 of the raised structure to form a flared structure. When the outer shell 8 and the inner shell 10 are aligned with each other, the reinforcement layer 2 is squeezed and fixed between the first annular slope 81 and the second annular slope 101.

[0070] Furthermore, the vulcanized sealing layer 7 is fixed to the outside of the outer sheath 3 by hot melting, and is fixedly connected to the outer shell 8 set at the end of the outer sheath 3, wherein the inner layer of the vulcanized sealing layer 7 is provided with an annular concave-convex structure, and the outer wall of the outer shell 8 is also provided with an annular concave-convex structure. The relative fixation of the vulcanized sealing layer 7 and the outer shell 8 is achieved by the mutual engagement of the annular concave-convex structures.

[0071] The inner housing 10 and the outer housing 8 are threadedly connected via screws 9 and nuts 11 , so that the joint structure is firmly fixed to both ends of the cable.

[0072] In this way, the cable can be connected to the electrical equipment and power supply equipment through the connector structure. Since the cavity in the sheath can accommodate a variety of wire cores, the connector structure can be made into a uniform model and specification, which is conducive to the replacement, maintenance and assembly of cable accessories, and is more universal.

[0073] In a specific embodiment, the power supply device is a deep-sea exploration submersible, and the power-consuming device is a detector carried by the deep-sea submersible. The detector includes an underwater television camera and a grabbing manipulator. The deep-sea submersible and the detector are connected for power and communication through the above-mentioned cables.

[0074] It is understandable that since the electrical connection parts of the deep-sea submersible and the detector itself are oil-filled devices, such as the plug cavity of the cable docking part, the waterproof, sealing and insulation properties can be improved by setting the plug cavity as an oil-filled structure.

[0075] Specifically, before the deep-sea submersible is launched into the water, the cables are connected in the order of deep-sea submersible cable connection-deep-sea submersible connector connection-detector cable connection-detector connector connection; that is, the signal line and / or power line in the deep-sea submersible is connected to the cable plug in the detector plug cavity, and then the hollow sheath structure with the connector structure is connected to the end face of the deep-sea submersible through bolts and sealing accessories, and then the other end of the cable is connected to the cable plug in the deep-sea submersible plug cavity, and then the connector structure is connected to the connecting end face of the detector through bolts and sealing accessories.

[0076] A sealing gasket is used to pad the end face of the inner shell 10, and bolts are used to pass through the inner shell 10 to tightly fit the end face of the inner shell 10 to the installation end face of the device.

[0077] In an optional embodiment, the insulating oil 4 is filled into the cavity 101 of the sheath by filling the plug cavity in the device with oil.

[0078] In a specific embodiment, a cable assembly with a length of 10m and an inner diameter of 43mm is installed between the deep-sea submersible and the detector, and insulating oil is injected from the oil filling port of one of the plug cavities of the deep-sea submersible and the detector. The injection speed of the first oil filling is less than 5L / min, and after filling, the injected oil volume is displayed as 59140ml. After standing for 5 minutes, the bubbles brought in during the oil filling are released. The second oil filling speed is less than 2L / min to fill the insulating oil. The second oil filling volume is 839ml. The sealing cover is covered on the oil filling port. At this time, the cable is completely filled with oil.

[0079] Among them, the capacity of the plug cavity is 950ml, and the total volume of the plug cavity and the cable is 59988ml. The amount of oil injected for the first time is 59140, and the amount of oil injected for the second time is 839ml. The actual amount of oil injected is 59979ml, and the filling amount of insulating oil is 99.98%.

[0080] Combine Figure 3As shown, in other embodiments, the joint further comprises a cable connection cover 12 fixed at one end of the inner housing 10, and the cable connection cover 12 is provided with a joint for the cable and optical fiber to pass through, and after the cable and optical fiber pass through, an insertion structure is formed on the outside, and a sealed cavity structure is formed in the sheath on the inside of the cable connection cover 12.

[0081] Specifically, the cable connection cover 12 is provided with an oil filling port, which can be a one-way valve, and the oil can be filled into the cavity in the sheath through the oil filling port, and the oil filling method is the same as the above-mentioned oil filling method.

[0082] In this way, the cavity is filled with insulating oil in advance, and the cable with the joint becomes a pre-filled oil cable.

[0083] In the above embodiments, the length of the cable assembly is 10-20m, and the diameter is 50-80mm.

[0084] In specific embodiments, when installing the cable, the two ends of the cable are directly connected to the deep-sea submersible and the probe, for example, the inner housing 10 and the outer housing 8 are fixed to the end face of the device interface periphery using bolts.

[0085] It can be understood that the working mode of the deep-sea submersible is to dive to a predetermined depth, open the hatch, release the probe, and control and communicate with the probe through the power cable and the optical fiber. In this way, the cable assembly serves as a power and signal transmission bridge between devices, can withstand the sudden increase in water pressure in the deep sea, and the cable has high flexibility, and the probe can perform flexible detection tasks.

[0086]

Oil filling method for cable for deep diving equipment

[0087] The third aspect of the present application proposes a technical solution, which is an oil filling method for the above-mentioned cable for deep diving equipment, comprising the following steps:

[0088] Step 1, making a sheath structure: extruding an inner sheath 1 by using an extrusion pipe, making a reinforcing layer outside the inner sheath, and extruding an outer sheath outside the reinforcing layer to form a sheath structure;

[0089] Step 2, constructing a sealed cavity: inserting the core into the sheath structure, connecting the two ends of the sheath and the core to a sealed joint or a power supply / equipment, and forming a sealed cavity in the sheath;

[0090] In the process of constructing the sealed cavity, one end of the sheath is sealed first, oil is injected into the cavity in the sheath from the other end, and after the oil is filled, the other end of the sheath is sealed.

[0091] In the preferred embodiment, the oil filling process, the filling speed is less than 5L / min, and the oil injection to avoid the impact of the liquid surface into the air, preferably make the oil attached to the device cavity wall down, and after filling the oil-filled cavity, static 5min, make the gas into the oil, and then cover the sealing cover, the insulation oil filling degree in the sealed cavity is greater than 99.9%, has good compression performance.

[0092] Optionally, the cable shown in the embodiment is connected to the power supply device and the power consumption device at both ends, wherein the power supply device is a deep-sea submersible, and the power consumption device is a probe carried by the deep-sea submersible, and the deep-sea submersible and the probe are connected through the above-mentioned cable to realize power and communication connection.

[0093] It can be understood that, since the electrical connection part of the deep-sea submersible and the probe itself is an oil-filled device, for example, the plug cavity of the cable connector, by setting the plug cavity as an oil-filled structure, the waterproof, sealing and insulation performance can be improved.

[0094] Specifically, before the deep-sea submersible is launched, the cable is connected, and the connection sequence is deep-sea submersible cable connection-deep-sea submersible connector connection-probe cable connection-probe connector connection; that is, the signal line and / or power line in the deep-sea submersible are connected to the cable plug in the probe plug cavity, and then the hollow sheath structure with the connector structure is connected to the end face of the deep-sea submersible through bolts and sealing accessories, and then the cable at the other end is connected to the cable plug in the plug cavity of the deep-sea submersible, and then the connector structure is connected to the connection end face of the probe through bolts and sealing accessories.

[0095] In which, the sealing gasket is used to pad the end face of the inner shell 10, and the bolt is used to pass through the inner shell 10 to tightly adhere the end face of the inner shell 10 to the mounting end face of the device.

[0096] In the optional embodiment, the insulation oil 4 is filled into the cavity 101 of the sheath by filling the oil into the plug cavity of the device.

[0097] For example, a 10m long cable assembly with an inner diameter of 43mm is installed between the deep-sea submersible and the probe, insulation oil is injected from the oil filling port of one of the plug cavities of the deep-sea submersible and the probe, the injection speed of the first oil injection is less than 5L / min, and the injection amount is 59140ml after full injection, and the oil is left for 5min to release the air bubbles brought in during the oil filling, the second oil injection speed is less than 2L / min to make the insulation oil full, the second oil injection amount is 839ml, and the sealing cover is covered on the oil filling port. At this time, the cable is filled with oil, and the filling amount of the insulation oil is 99.98%.

[0098] In other embodiments, the two ends of the cable can be connected to construct a joint with a sealed space, and the joint also includes a cable connection cover 12, which is fixed to one end of the inner shell 10. The cable connection cover 12 is provided with a joint for the cable and the optical fiber to pass through. After the cable and the optical fiber pass through, a plug-in structure is formed on the outside, and on the inside of the cable connection cover 12, a sealed cavity structure is formed in the sheath.

[0099] Specifically, the cable connection cover 12 is provided with an oil filling port, which can be a one-way valve. Oil can be filled into the cavity in the sheath through the oil filling port. The oil filling method is the same as the above method, and the filling amount of insulating oil is controlled to exceed 99.9%.

[0100] In this way, the cavity is filled with insulating oil in advance, making the cable with connector a pre-oil-filled cable.

[0101] In the above embodiment, the length of the cable assembly is 10-20 m, and the diameter thereof is 50-80 mm.

[0102] Preferably, in step 1, the inner sheath is extruded using polycarbonate, and the extruded extrusion head includes a film sleeve and a mold core, an extrusion channel is formed between the film sleeve and the mold core, wherein the inner diameter of the mold sleeve is 1 to 1.5 mm larger than the outer diameter of the inner sheath, and the inner diameter of the mold core is 1 to 1.5 mm smaller than the outer diameter of the inner sheath.

[0103] In a specific embodiment, the inner sheath 1 is extruded by a melt extrusion process, and the extrusion temperatures of zones 1 to 4 of the extruder are (230±20)°C, (240±20)°C, (250±20)°C, and (270±20)°C, respectively. The temperatures of the flange, head, and die are (250±20)°C, (260±20)°C, and (270±20)°C, respectively. The screw speed is (10-40)n / min, and the screw current is (30-70)A.

[0104] Preferably, in step 1, the outer sheath 3 is extruded using polyurethane, and the extruded extrusion head includes a film sleeve and a mold core, an extrusion channel is formed between the film sleeve and the mold core, and the difference between the inner diameter of the mold sleeve and the outer diameter of the outer sheath is in the range of -0.3 to +0.3 mm. Since the outer sheath 3 will shrink after extrusion, the inner diameter of the mold core is 0.3 to 0.5 mm larger than the maximum outer diameter before extrusion.

[0105] In a specific embodiment, the outer sheath 3 is extruded by a melt extrusion process, and the extrusion temperatures of zones 1 to 4 of the extruder are (75±20)°C, (120±20)°C, (160±20)°C, and (175±20)°C, respectively. The temperatures of the flange, head, and die are (160±20)°C, (180±20)°C, and (180±20)°C, respectively. The screw speed is (10~40)n / min, and the screw current is (10~40)A.

[0106] Optional, combined Figure 4 As shown in a-4c, the inner sheath 1 is extruded through a melt-molding extrusion process to form a hollow tube structure. Aramid is braided outside the inner sheath 1. The number of aramid fibers is calculated based on the tensile strength required for the cable. A suitable braiding machine is then selected to braid the reinforcement layer 2. The outer sheath 3 is extruded outside the reinforcement layer 2 to form a sheath structure.

[0107] Combine Figure 4 As shown in d-4f, use the pipe threading equipment to pass the required wire core through the sheath structure, then connect the connector structure at both ends of the cable, and finally connect the connector to the power supply equipment and the power-consuming equipment. During this process, the cable can be filled with oil.

[0108] It can be understood that in the embodiment shown in the present invention, power and signals are transmitted between the power supply equipment and the power-consuming equipment through oil-filled cables, and its application scenario is deep sea or high-voltage environment, aiming to achieve the purpose of short-distance, periodic power and signal transmission between the two devices in a high-voltage environment.

[0109] In combination with the above embodiments, when ordinary cables are used in deep sea or high pressure media, they will be squeezed and deformed by the action of hydraulic pressure, causing certain damage to the internal structure of the cable. The cable of the present invention can solve the reliability problem of the cable in high pressure media through the internal oil-filled balance structure; ordinary underwater cables need to be customized according to the number of different photoelectric cores, and the outer diameters of the manufactured cables are different. Not only do they need to use multiple extrusion heads during production, but the matching connectors also need to be specially customized with different interfaces. They are not universal and are more troublesome to maintain. The cable in the present invention can integrate photoelectric cores of different specifications and core numbers in a sheath of the same diameter. It is not only simple to make, but also easy to replace, maintain and assemble cable accessories, and is more universal; the cable of the present invention is composed of an outer sheath, an inner sheath, a reinforcement layer, a core, etc. When used underwater, due to the presence of the reinforcement layer, it has certain tensile strength, tearing resistance, scratch resistance, and external force impact resistance. The reinforcement layer is woven from aramid, which can make the cable have better flexibility and a smaller bending radius than the metal woven reinforcement layer.

[0110] While the present invention has been disclosed above with reference to preferred embodiments, this is not intended to limit the present invention. Persons skilled in the art will readily appreciate that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A cable for deep-sea diving equipment, characterized in that: include: A wire core, two ends of which are electrically connected to an electric device and a power supply device, respectively, wherein the power supply device and the electric device are configured to be in a liquid pressure medium in an operating mode; A sheath, the sheath being configured to be in the shape of a hollow tube, the space extending inwardly from the inner wall of the sheath forming a cavity (101) for accommodating a wire core penetrating the cavity (101), the first end of the sheath being sealedly connected to the electrical device, and the second end being sealedly connected to the power supply device, so that the cavity (101) forms a sealed cavity; The cavity (101) is filled with insulating oil (4), and the insulating oil fills the cavity (101). The insulating oil (4) is liquid, so that the sheath is supported by the insulating oil (4) filled in the cavity (101), thereby preventing the liquid pressure medium outside the sheath from compressing the volume of the cavity (101), and making the pressure inside and outside the sheath balanced; The insulating oil (4) includes mineral oil or silicone oil, and the filling degree of the insulating oil (4) in the cavity (101) is greater than 99.9%; The oil filling method for the cable of deep-sea submersible equipment comprises the following steps: Step 1, making a sheath structure: using a tube extrusion method to extrude an inner sheath (1), making a reinforcement layer (2) outside the inner sheath (1), and extruding an outer sheath (3) outside the reinforcement layer (2) to form a sheath structure; Step 2: Construct a sealed cavity: insert the wire core into the sheath structure, connect the sheath and both ends of the wire core to the sealed joint or power supply / use equipment, so that a sealed cavity is formed in the sheath; In the process of constructing the sealed cavity, the first end of the sheath is sealed first, and oil is injected into the cavity inside the sheath from the second end. After the cavity is filled, the second end of the sheath is sealed.

2. The cable for deep-sea submersible equipment according to claim 1, characterized in that: The inner sheath (1) comprises a nitrile rubber material layer or a polycarbonate material layer.

3. The cable for deep-sea submersible equipment according to claim 1, characterized in that: The reinforcement layer (2) comprises a braided layer, and the braided layer comprises a fiber wire braided layer, a metal wire braided layer or a fiber metal multifilament braided layer.

4. The cable for deep-sea submersible equipment according to claim 1, characterized in that: The outer sheath (3) comprises a layer of polyurethane material.

5. The cable for deep-sea submersible equipment according to claim 1, characterized in that: The core includes an electrical conductor (5) and / or an optical fiber (6).

6. The cable for deep-sea submersible equipment according to claim 1, characterized in that: In step 1, the inner sheath is extruded using polycarbonate. The extrusion head includes a mold sleeve and a mold core, and an extrusion channel is formed between the mold sleeve and the mold core. The inner diameter of the mold sleeve is 1 to 1.5 mm larger than the outer diameter of the inner sheath, and the inner diameter of the mold core is 1 to 1.5 mm smaller than the outer diameter of the inner sheath.

7. The cable for deep-sea submersible equipment according to claim 1, characterized in that: In step 1, the outer sheath is extruded using polyurethane. The extrusion head includes a mold sleeve and a mold core. An extrusion channel is formed between the mold sleeve and the mold core. The difference between the inner diameter of the mold sleeve and the outer diameter of the outer sheath is in the range of -0.3 to +0.3 mm. The inner diameter of the mold core is 0.3 to 0.5 mm larger than the maximum outer diameter before extrusion.

8. A cable assembly, characterized in that: The deep-sea submersible equipment cable according to any one of claims 1 to 5 further comprises: A connector connected between the cable and a power supply device or a power-consuming device; The connector is fixedly connected to the sheath, and the connector is used to connect to the electrical connection interface of the power supply device and the power-consuming device, so that a closed cavity is formed in the sheath between the power supply device and the power-consuming device.

9. The cable assembly according to claim 8, wherein: The joint comprises a blocking structure, which is configured to allow the wire core to pass through and fix the wire core, so that the cavity (101) between the two joints forms a sealed cavity.

10. The cable assembly according to claim 8, wherein: The joint comprises a vulcanized sealing layer (7), an outer shell (8) and an inner shell (10). The outer shell (8) and the inner shell (10) are fixed to one end of the cable and clamp the reinforcement layer (2). The vulcanized sealing layer (7) is wrapped around the outer wall of the outer shell (8) to fix the outer shell (8) and the outer sheath (3).

11. The cable assembly according to claim 9, wherein: The joint comprises a vulcanized sealing layer (7), an outer shell (8) and an inner shell (10), wherein the outer shell (8) and the inner shell (10) are fixed to one end of the cable and clamp the reinforcing layer (2), and the vulcanized sealing layer (7) is wrapped around the outer wall of the outer shell (8) to fix the outer shell (8) and the outer sheath (3); one end of the inner shell (10) is fixed with a cable connection cover (12), and the cable connection cover (12) is provided with a joint through which the power supply wire (5) and / or the optical fiber (6) pass, and a closed space is formed within the sheath, the inner shell (10) and the cable connection cover (12).

12. The cable assembly according to claim 10 or 11, characterized in that: The outer shell (8) is provided with a first annular inclined surface (81), and the inner shell (10) is provided with a protruding structure, wherein the protruding structure has a second annular inclined surface. When the outer shell (8) and the inner shell (10) are aligned, the first annular inclined surface (81) and the second annular inclined surface approach each other and are aligned.

Images