CN113687485A - Submarine optical cable branch equipment - Google Patents

Submarine optical cable branch equipment Download PDF

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Publication number
CN113687485A
CN113687485A CN202111218098.4A CN202111218098A CN113687485A CN 113687485 A CN113687485 A CN 113687485A CN 202111218098 A CN202111218098 A CN 202111218098A CN 113687485 A CN113687485 A CN 113687485A
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CN
China
Prior art keywords
bearing cylinder
branch
pressure bearing
pressure
end cover
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CN202111218098.4A
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CN113687485B (en
Inventor
侯岩崎
金戈
郝利军
刘志动
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Huahai Communication Technology Co Ltd
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Huahai Communication Technology Co Ltd
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Priority to CN202111218098.4A priority Critical patent/CN113687485B/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4439—Auxiliary devices
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4429—Means specially adapted for strengthening or protecting the cables
    • G02B6/44384—Means specially adapted for strengthening or protecting the cables the means comprising water blocking or hydrophobic materials

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Cable Accessories (AREA)
  • Mechanical Coupling Of Light Guides (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

The embodiment of the application provides an optical fiber cable branch equipment in seabed includes: a pressure bearing cylinder and a branch structure; the branch structure comprises a main path port and two branch path ports which are arranged in the opposite direction of the main path port, the pressure bearing cylinder is in threaded connection with the main path port, and a watertight and airtight structure is arranged at the joint of the pressure bearing cylinder and the main path port; the pressure-bearing cylinder is a metal cylinder, and an internal unit is arranged in the pressure-bearing cylinder; the two ends of the pressure bearing cylinder are respectively provided with a first end cover and a second end cover, the first end cover is in threaded connection with the pressure bearing cylinder, the second end cover is in threaded connection with the pressure bearing cylinder, the threaded connection part of the first end cover and the pressure bearing cylinder and the connection part of the second end cover and the pressure bearing cylinder are provided with watertight and airtight structures so as to enhance sealing performance, and therefore when the branch equipment is applied to a submarine environment, the normal functions of the internal units of the product can be prevented from being influenced due to the fact that seawater and gas enter the pressure bearing cylinder.

Description

Submarine optical cable branch equipment
Technical Field
The application relates to the technical field of optical transmission, in particular to submarine optical cable branch equipment.
Background
A Branching Unit (BU) is one of the key devices in a submarine cable optical transmission system, and is used to branch optical fibers and power lines in a submarine cable. For a multi-landing-capability submarine cable network, the branching unit BU provides a flexible and economical solution, which has the feature of separating the optical transmission links, so that traffic of the trunk can be transmitted to each branch, and each branch can also implement traffic transmission.
The branching unit BU can be divided into two types, passive BU and PS (Power switch) BU, from the electrical layer surface. The passive BU does not need power supply and has no power supply path configuration function; the PS BU belongs to the active BU from the electrical plane, and can ensure that when any branch on a transmission link fails, other branches can recover normal power supply, thereby ensuring the continuity of service, actively switching the power supply condition of the branches and facilitating maintenance. Therefore, compared with a passive BU, the PS BU requires a larger internal space to accommodate placement of components such as high-voltage switching function devices, single boards, relays, and the like.
The current PS BU consists of a pressure-bearing cylinder, a main road structure connected with one end of the pressure-bearing cylinder, and a branch structure connected with the other end of the pressure-bearing cylinder. The circuit board is provided with at least one circuit unit for realizing the power supply function and a vacuum relay. In order to ensure that components in the pressure-bearing cylinder can normally operate, the pressure-bearing cylinder needs to keep a vacuum environment. In order to obtain a vacuum environment, when the PS BU is manufactured at present, a pressure-bearing cylinder needs to be vacuumized, and the connecting tail end of an end cover and the pressure-bearing cylinder is welded and sealed. The welded seal can ensure that a vacuum environment is formed in the pressure-bearing cylinder, but the equipment is difficult to disassemble, and the repair and the maintenance performance are poor. And current branch structure welding is outside at pressure-bearing cylinder, and the outside radial dimension that leads to branch structure and pressure-bearing cylinder's junction is great, and then has led to the whole volume of PS BU to be bigger than normal.
Disclosure of Invention
The embodiment of the application provides an optical fiber cable branch equipment in seabed includes: the bending device comprises a first bending limiter, a pressure bearing cylinder, a branch structure and two second bending limiters; the first bending limiter, the pressure bearing cylinder, the branch structure and the two second bending limiters are connected in sequence; the branch structure comprises a main path port and two branch path ports which are arranged in the opposite direction of the main path port, a pressure bearing cylinder is in threaded connection with the main path port, a joint of the pressure bearing cylinder and the main path port is filled with thread sealant, and two second bending limiters are in one-to-one corresponding connection with the two branch path ports; the pressure-bearing cylinder is a metal cylinder, and an internal unit is arranged in the pressure-bearing cylinder; the end of the pressure bearing cylinder connected with the first bending limiter is provided with a first end cover, the end of the pressure bearing cylinder connected with the branch structure is provided with a second end cover, the first end cover is in threaded connection with the pressure bearing cylinder, the second end cover is in threaded connection with the pressure bearing cylinder, the threaded connection part of the first end cover and the pressure bearing cylinder and the connection part of the second end cover and the pressure bearing cylinder are both provided with watertight and airtight structures, and thread sealant is filled in the watertight and airtight structures.
In one implementation mode, the pressure-bearing cylinder sequentially comprises a central section, a first connecting section and a second connecting section along the direction close to the branch structure, and the central section, the first connecting section and the second connecting section are of an integral structure; the inner diameter of the first connecting section is larger than that of the central section so as to form a hole shoulder facing the branch structure at the junction of the first connecting section and the central section, the inner diameter of the second connecting section is larger than that of the first connecting section, and an inner thread is arranged on the inner wall of the first connecting section; the second end cover is arranged in a space formed by the first connecting section and the second connecting section, and the diameter of the second end cover is larger than the inner diameter of the central section and smaller than the inner diameter of the second connecting section; the edge of second end cover extends to the slope of the inner wall direction of hole shoulder and first linkage segment, forms the terminal surface towards the hole shoulder and the outer peripheral face towards the inner wall of first linkage segment, and the terminal surface pastes tight hole shoulder, and the outer peripheral face is provided with the external screw thread with the internal thread matched with of the inner wall of first linkage segment, outer peripheral face and the inner wall threaded connection of first linkage segment.
In one implementation, the first end cap and the second end cap are made of titanium alloy, and each of the first end cap and the second end cap has an outer shape protruding in an arc shape to one side, and the first end cap and the second end cap are used for separating the optical fiber and the cable in the submarine cable and then accessing an internal unit for accommodating and fixing electrical and optical elements.
In one implementation, the inner wall of the second connecting section is provided with internal threads; the main road port includes the connector head, and the external diameter of connector head and the internal diameter size phase-match of second linkage segment, the outer wall of connector head be provided with the internal thread matched with external screw thread of the inner wall of second linkage segment, the outer wall of connector head and the inner wall threaded connection of second linkage segment.
In one implementation mode, the branch structure further comprises a tapered cylinder, the trunk port is connected with the two branch ports through the tapered cylinder, and the size of a cavity of the tapered cylinder is gradually increased from one end of the trunk port to one end of the branch port.
In one implementation, the second end cap is further provided with two photoelectric channels, and the two photoelectric channels comprise two through holes arranged in the center of the second end cap; the through holes are used for leading out the optical fibers and the cables from the inner unit in the pressure bearing cylinder, and the optical fibers and the cables are separated from the second end cover through insulating materials.
In one implementation, an insulating jacket layer is arranged between the pressure-bearing cylinder and the internal unit, and the insulating jacket layer is used for insulating the internal unit from the outside and transferring heat of the internal unit to the pressure-bearing cylinder for heat dissipation.
In one implementation mode, each of the first bending limiter and the second bending limiter comprises a universal joint and a sheath, the sheath is coated outside the universal joint, and the universal joint is formed by sequentially connecting a plurality of connecting rings which can generate twisting relative to each other; the port of the branch is provided with a butt joint mechanism, one end of the second bending limiter is connected with the butt joint mechanism, and the other end of the second bending limiter is connected with the branch submarine cable sequentially through the universal connector and the buffer. One end of the first bending limiter is connected with the pressure-bearing cylinder, and the other end of the first bending limiter is connected with the trunk submarine cable sequentially through the universal connector and the buffer.
In one implementation, the pressure-bearing cylinder is made of a titanium alloy material, and the main body of the branch structure is made of high-strength structural steel.
In one implementation, the undersea optical fiber cable breakout device is grounded by an ocean grounding means such that the internal units form a closed current loop.
In one implementation, the marine grounding device is a titanium alloy substrate structure; the ocean grounding device is arranged at the far end of the submarine optical cable branch equipment, so that when the ocean grounding device is used as a cathode of a current loop, hydrogen gas generated by obtaining electrons from hydrogen ions in seawater occurs at one end far away from the submarine optical cable branch equipment, and when the ocean grounding device is used as an anode of the current loop, the ocean grounding device is provided with electrons from chlorine ions in seawater.
According to the submarine optical cable branch equipment provided by the embodiment of the application, the pressure-bearing cylinder is made of titanium alloy materials, the pressure-bearing cylinder can provide sufficient layout space for devices, single plates, relays and other devices which realize a high-voltage switching function in the submarine optical cable branch equipment, can bear the water pressure of the seabed, and protects all the devices from being damaged; in addition, the pressure bearing cylinder and the end covers at the two ends of the pressure bearing cylinder are provided with watertight and airtight structures to enhance the sealing performance, so that when the branch equipment is applied to a submarine environment, seawater and gas can be prevented from entering the pressure bearing cylinder to influence the normal functions of the internal units of the product, and meanwhile, the pressure bearing cylinder and the end covers can be separated after being connected, so that the maintainability of the submarine optical cable branch equipment is improved; in addition, the branch structure in this application embodiment has adopted three port structure, and the trunk port is connected with the pressure bearing section of thick bamboo, and two branch road ports are connected with two crooked limiters respectively, compares with the outside branch structure of traditional welding at the pressure bearing section of thick bamboo, and the volume of the branch structure in this application embodiment is littleer, has avoided the problem that the whole volume of submarine optical cable branch equipment is bigger than normal because the branch structure is bulky.
Drawings
FIG. 1 is a schematic diagram of a current PS BU;
FIG. 2 is a schematic structural diagram of an undersea optical fiber cable breakout device provided by an embodiment of the present application;
FIG. 3 is a schematic diagram of a branching structure provided by an embodiment of the present application;
FIG. 4 is a schematic view of the pressure-bearing cartridge, the first end cap, and the branch structure according to the embodiment of the present disclosure;
fig. 5 is a schematic diagram of the submarine fiber cable branch device provided by the embodiments of the present application being grounded via an ocean grounding device.
Illustration of the drawings:
wherein, 10-pressure bearing cylinder, 11-end cover, 20-main path structure, 30-branch structure, 40-ocean grounding device, 50-submarine optical cable branch equipment, 100-first bending limiter, 200-pressure bearing cylinder, 210-central section, 220-first connecting section, 221-inner wall, 230-second connecting section, 231-inner wall, 240-hole shoulder, 250-insulating sleeve layer, 300-branch structure, 310-trunk port, 320-branch port, 321-butt joint mechanism, 330-conical cylinder body, 350-hoisting hole, 360-connector head, 361-outer wall, 400-second bending limiter, 410-universal joint, 420-sheath, 500-first end cover, 600-second end cover, 610-end face, 620-peripheral surface, 630-optical channel, 700-optical fiber and cable, 800-internal unit, 910-universal connector, 920-buffer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A Branching Unit (BU) is one of the key devices in a submarine cable optical transmission system, and is used to branch optical fibers and power lines in a submarine cable. For a submarine cable network with multiple landing capabilities, submarine optical cable branching equipment BU provides a flexible and economical solution, which has the characteristic of separating optical transmission links, can transmit the traffic of a trunk to each branch, and can also realize the transmission of the traffic of each branch.
The branching unit BU can be divided into two types, passive BU and PS (Power switch) BU, from the electrical layer surface. The passive BU does not need power supply and has no power supply path configuration function; the PS BU belongs to the active BU from the electrical plane, and can ensure that when any branch on a transmission link fails, other branches can recover normal power supply, thereby ensuring the continuity of service, actively switching the power supply condition of the branches and facilitating maintenance. Therefore, compared with a passive BU, the PS BU requires a larger internal space to accommodate placement of components such as high-voltage switching function devices, single boards, relays, and the like.
Fig. 1 is a schematic diagram of a current PS BU. As shown in fig. 1, the PS BU may include a pressure-bearing cylinder 10, a main road structure 20 connected to one end of the pressure-bearing cylinder, and a branch structure 30 connected to the other end of the pressure-bearing cylinder. Wherein, the interior unit in the pressure-bearing cylinder 10 is provided with the circuit board, and the circuit board is installed and is used for realizing at least one circuit unit and the vacuum relay of power function. In order to ensure that the components in the pressure-bearing cylinder 10 can normally operate, a vacuum environment needs to be maintained in the pressure-bearing cylinder 10. In order to obtain a vacuum environment, when the PS BU is manufactured, the pressure-bearing cylinder 10 needs to be vacuumized, and the end cover 11 and the connection end of the pressure-bearing cylinder are welded and sealed. The weld seal, while ensuring a vacuum environment within the pressure-bearing cartridge 10, can make the equipment difficult to remove and have poor reworkability and maintainability. In addition, the existing branch structure is welded outside the pressure-bearing cylinder, so that the external radial size of the joint of the branch structure 30 and the pressure-bearing cylinder 10 is large, and further the overall volume of the PS BU is large.
To improve the maintainability of PS BU and reduce the volume of PS BU, embodiments of the present application provide an undersea optical cable breakout device, which may be a PS BU, a passive BU, or other optical branching device.
Fig. 2 is a schematic structural diagram of an undersea optical fiber cable branching device provided by an embodiment of the present application. As shown in fig. 2, the undersea optical fiber cable branching apparatus sequentially includes, in a trunk-to-branch direction: a first bending limiter 100, a pressure-bearing cartridge 200, a branching structure 300 and two second bending limiters 400. Wherein the first bending limiter 100, the pressure-bearing cartridge 200, the branch structure 300 and the two second bending limiters 400 are connected in sequence.
The pressure-bearing cylinder 200 may be a cylindrical metal cylinder, preferably made of a titanium alloy material. Because the titanium alloy has extremely high strength and corrosion resistance, the pressure-bearing cylinder 200 made of the titanium alloy material can effectively protect the internal units thereof from being impacted by external force and corroded by seawater, thereby improving the reliability and the service life of the submarine optical cable branch equipment. The main purpose of the pressure bearing cartridge 200 is to carry the internal units of the undersea optical fiber cable breakout equipment, such as high voltage switching functions, a single board, relays, etc.
The end of the pressure-bearing cartridge 200 connected to the first bending restrictor 100 is provided with a first end cap 500, and the end of the pressure-bearing cartridge 200 connected to the branch structure 300 is provided with a second end cap 600. The first and second end caps 500 and 600 are made of titanium alloy, and the first and second end caps 500 and 600 each have a shape protruding in an arc shape to one side, and the first and second end caps 500 and 600 are used to separate optical fibers and cables in a submarine cable and then to access an internal unit for receiving and fixing electrical and optical components. The joint of the first end cap 500 and the pressure-bearing cylinder 200 and the joint of the second end cap 600 and the pressure-bearing cylinder 200 are provided with watertight and airtight structures. In the concrete implementation, the first end cover 500 is in threaded connection with the pressure bearing cylinder 200, the second end cover 600 is in threaded connection with the pressure bearing cylinder 200, and the threaded connection part of the first end cover 500 and the pressure bearing cylinder 200 and the connection part of the second end cover 600 and the pressure bearing cylinder 200 are both filled with thread sealant, so that internal units in the pressure bearing cylinder 200 are isolated from seawater and gas, the pressure bearing cylinder 200 forms a vacuum environment, and the requirements of air tightness and water tightness of the submarine optical cable branch equipment in a submarine environment are met. The first and second end caps 500 and 600 are provided with passages for the optical fibers and cables to pass through, which include through holes provided at the centers of the first and second end caps 500 and 600, so that the optical fibers and cables in the submarine cable can be separated by the through holes and then accessed to an internal unit for receiving and fixing electrical and optical components.
Fig. 3 is a schematic diagram of a branch structure 300 provided in an embodiment of the present application. Referring to fig. 2 and 3, the branching structure 300 is a three-port structure including a trunk port 310 connected to the pressure-containing cylinder 200, and two branch ports 320 provided opposite to the trunk port 310 for connection to the second bending restrictor 400. The trunk port 310 and the two branch ports 320 are connected by a tapered cylinder 330, the cavity size of the tapered cylinder 330 is gradually increased from the trunk port 310 end to the branch port 320 end, and the cavity size of the tapered cylinder 330 at the branch port 320 end is preferably set to be able to juxtapose the two branch ports 320.
The trunk port 310 of the branch structure 300 is in threaded connection with the pressure bearing cylinder 200, the joint between the pressure bearing cylinder 200 and the trunk port 310 is filled with a thread sealant, and the two second bending limiters 400 are connected with the two branch ports 320 in a one-to-one correspondence manner. The branching structure 300 provides a protected space for the optical fibers and cables from the second end cap 600 to the two branches. In order to protect the optical fibers, cables, and the like inside the branch structure 300 from external impact and seawater, the branch structure 300 needs to have sufficient strength and corrosion resistance, and thus the branch structure 300 is preferably made of high-strength structural steel.
In the embodiment of the present application, since the branch structure 300 is not connected to the pressure bearing barrel 200 by welding, but is connected by threads, the external radial dimension of the connection between the branch structure 300 and the pressure bearing barrel 200 is smaller, so that the overall volume of the submarine optical cable branch equipment is smaller.
In one implementation, at least one lifting hole 350 is further disposed on the outer shell of the branch structure 300, so as to facilitate lifting during equipment construction.
Fig. 4 is a schematic diagram of the pressure-bearing cartridge 200, the second end cap 600 and the branch structure 300 according to the embodiment of the present application. As shown in fig. 4, the pressure-bearing cylinder 200 sequentially includes a central section 210, a first connecting section 220 and a second connecting section 230 along a direction close to the branch structure 300, and the central section 210, the first connecting section 220 and the second connecting section 230 are sequentially connected into an integral structure.
The junction of the second end cap 600 and the pressure-containing cylinder 200 is provided with a watertight and airtight structure. Wherein the inner diameter of the first connecting section 220 is larger than that of the central section 210, thereby forming a hole shoulder 240 facing the branch structure 300 at the interface of the first connecting section 220 and the central section 210, and the inner diameter of the second connecting section 230 is larger than that of the first connecting section 220. The inner wall 221 of the first coupling section 220 is provided with internal threads and the inner wall 231 of the second coupling section 230 is provided with internal threads. The second end cap 600 is disposed in the space formed by the first connection section 220 and the second connection section 230, and has a diameter greater than the inner diameter of the central section 210 and smaller than the inner diameter of the second connection section 230. The edge of the second end cap 600 extends obliquely toward the inner wall of the hole shoulder 240 and the first connection section 220 to form an end surface 610 facing the hole shoulder 240 and an outer circumferential surface 620 facing the inner wall 221 of the first connection section 220, and the outer circumferential surface 620 is provided with external threads matching with the internal threads of the inner wall 221.
When the second end cap 600 is installed, the second end cap 600 can be put into the pressure-bearing cartridge 200 from the second connection section 230, and since the diameter of the second end cap 600 is smaller than the inner diameter of the second connection section 230, the second end cap 600 can easily pass through the second connection section 230 to reach the first connection section 220. Since the outer circumferential surface 620 of the second end cap 600 and the inner wall 231 of the first connection section 220 are provided with the mutually matched thread structures, the second end cap 600 can be screwed into the first connection section 220 through the thread fit until the end surface 610 of the second end cap 600 abuts against the hole shoulder 240 of the branch structure 300, so that the outer circumferential surface 620 of the second end cap 600 and the inner wall 231 of the first connection section 220 form the thread connection, and meanwhile, the hole shoulder 240 of the branch structure 300 realizes the axial limit for the second end cap 600. In addition, before the second end cap 600 is installed, a thread sealing compound may be filled in the inner wall 221 of the first connection section 220 and the outer circumferential surface 620 of the second end cap 600, so that after the outer circumferential surface 620 of the second end cap 600 and the inner wall 231 of the first connection section 220 are screwed, the water and air tightness between the pressure-bearing cylinder 200 and the second end cap 600 may be ensured without welding the pressure-bearing cylinder 200 and the second end cap 600.
As further shown in fig. 4, the second end cap 600 is further provided with two photoelectric channels 630, that is, two through holes disposed at the center of the second end cap 600, the through holes are used for leading out the optical fibers and the cables from the internal units in the pressure-bearing cylinder 200, and the optical fibers and the cables are separated from the second end cap 600 by an insulating material, so as to ensure that the external structures of the submarine optical cable branching equipment are all at zero potential.
It should be added that in the embodiment of the present application, the joint of the first end cap 500 and the pressure-bearing cylinder 200 is also provided with a water-tight and air-tight structure. For example: the end of the pressure-bearing cylinder 200 connected to the first end cap 500 may also include the first connection section 220 and the hole shoulder 240, or include other structures for positioning and screwing with the first end cap 500, and correspondingly, the first end cap 500 may also include the end surface 610 and the outer circumferential surface 620, or include other structures for positioning and screwing with the pressure-bearing cylinder 200, and the joint between the pressure-bearing cylinder 200 and the first end cap 500 may also be filled with a thread sealant to achieve good water-tightness and air-tightness. The detailed connection structure between the pressure-bearing cylinder 200 and the first end cap 500 is not described in detail in the embodiment of the present application.
As further shown in fig. 3 and 4, trunk port 310 of branching structure 300 includes a connector head 360, an outer diameter of connector head 360 matches an inner diameter dimension of second coupling section 230, and an outer wall 361 of connector head 360 is provided with external threads that mate with internal threads of inner wall 231 of second coupling section 230.
When the branch structure 300 is installed, the connector head 360 may be screwed into the second connector block 230 by means of a screw fit, enabling a screw connection of the outer wall 361 of the connector head 360 with the inner wall 231 of the second connector block 230. In addition, before the branch structure 300 is installed, a thread sealing adhesive may be coated on the inner wall 231 of the second connection section 230 and the outer wall 361 of the connector head 360, so that after the outer wall 361 of the connector head 360 is screwed with the inner wall 231 of the second connection section 230, the sealing performance may be ensured without welding the branch structure 300 and the pressure-bearing cartridge 200.
As further shown in fig. 3 and 4, each branch port 320 of the branch structure 300 is provided with a docking mechanism 321, the docking mechanism 321 is used for connecting with the second bending limiter 400, and the docking mechanism 321 may be any currently available structure for connecting with the second bending limiter 400, such as a pin connection structure, a pipe connection structure, and the like, which is not limited in the embodiments of the present application.
As further shown in fig. 4, an insulating sheath 250 is further disposed between the pressure-bearing cartridge 200 and the internal unit 800, and the insulating sheath 250 is used to ensure insulation of the internal unit 800 from the outside. The insulating sheath layer 250 may be made of an insulating material with good thermal conductivity, so that heat generated by the internal device can be conducted to the outside of the pressure bearing cylinder 200 through the insulating sheath layer 250, thereby achieving heat dissipation of the internal device.
As further shown in fig. 2, second bending limiter 400 includes gimbal 410 and boot 420. One end of the universal joint 410 is connected to the docking mechanism 321 of the branch structure 300, and the sheath 420 covers the universal joint 410. The universal joint 410 may be formed by sequentially connecting a plurality of connection rings which can generate twisting relatively, and the universal joint 410 has high mechanical strength, and can ensure that the submarine optical cable branch equipment can bear tensile force or torsion with considerable strength without damage in the transportation and laying operation processes. The universal joint 410 enables the submarine optical cable branching equipment to have certain bending performance, and the submarine optical cable branching equipment can be bent under the condition of passing through a hub during submarine cable construction and recovery. The sheath 420 can prevent sediment and debris on the sea floor from entering between the connection rings of the universal joint 410 and affecting the normal function of the universal joint 410.
The end of each second bending limiter 400 remote from the branch structure 300 is further connected to the branch sea cable via a common connector 910 and a buffer 920 in that order. The universal connector 910 is a connecting device with a universal specification in a submarine cable optical transmission system, and can connect each device in the submarine cable optical transmission system with each type of submarine cable, so as to facilitate integration and maintenance of each device and each type of submarine cable. In the embodiment of the present application, the universal connector 910 can effectively combine the optical and electrical signals of the branching structure 300 and the optical and electrical signals of the branch submarine cables, so that the optical and electrical signals branched from the submarine optical cable branching equipment can be transmitted to the branch submarine cables. The buffer 920 is disposed at a branch end of the submarine cable branch equipment, that is, an end of the universal connector 910 away from the second bending limiter 400, and the buffer 920 is sleeved on the branch submarine cable led out from the universal connector 910, so as to prevent the branch submarine cable led out from the universal connector 910 from being excessively bent under an external force, and protect the branch submarine cable from being damaged.
The first bending limiter 100 may have the same structure as the second bending limiter 400, i.e. comprising a gimbal 410 and a sheath 420. One end of the universal joint 410 is connected to the pressure-bearing cylinder 200, and the sheath 420 covers the universal joint 410. The universal joint 410 may be formed by sequentially connecting a plurality of connection rings which can generate twisting relatively, and the universal joint 410 has high mechanical strength, and can ensure that the submarine optical cable branch equipment can bear tensile force or torsion with considerable strength without damage in the transportation and laying operation processes. The universal joint 410 enables the submarine optical cable branching equipment to have certain bending performance, and the submarine optical cable branching equipment can be bent under the condition of passing through a hub during submarine cable construction and recovery. The sheath 420 can prevent sediment and debris on the sea floor from entering between the connection rings of the universal joint 410 and affecting the normal function of the universal joint 410.
The end of the first bending limiter 100 remote from the pressure-bearing cartridge 200 is also connected to the trunk sea cable via the universal connector 910 and the buffer 920 in this order. The universal connector 910 can effectively combine the optical power of the trunk sea cable with the optical power of the internal unit 800 of the pressure-bearing cartridge 200, so that the optical power signal of the trunk sea cable can be transmitted to the internal unit 800 of the pressure-bearing cartridge 200. The buffer 920 is arranged at one end, far away from the first bending limiter 100, of the general connector 910, and the buffer 920 is sleeved on the trunk sea cable led out from the general connector 910, so that the trunk sea cable led out from the general connector 910 can be prevented from being excessively bent under the action of external force, and the trunk sea cable is protected from being damaged.
According to the technical scheme, the pressure-bearing cylinder of the submarine optical cable branch equipment provided by the embodiment of the application is made of the titanium alloy material, and the pressure-bearing cylinder can provide sufficient layout space for components such as high-voltage switching function devices, single plates and relays in the submarine optical cable branch equipment, can bear the water pressure of the seabed and protect the components from being damaged; in addition, the bearing cylinder is in threaded connection with the end covers at the two ends of the bearing cylinder, and the threaded connection is reinforced and sealed by the thread sealant, so that seawater is effectively isolated, the seawater is prevented from entering the bearing cylinder, meanwhile, the bearing cylinder and the end covers can be separated after being connected through threaded connection, and the maintainability of the submarine optical cable branch equipment is improved; in addition, the branch structure in the embodiment of the application adopts a three-port structure, the trunk port is connected with the pressure bearing barrel, and the two branch ports are respectively connected with the two bending limiters.
It will be appreciated that in submarine cable systems, internal units in the submarine cable branch plant, such as high voltage switching functions, boards, relays, etc., as well as other active components of the submarine cable system, need to form a closed circuit of current to be able to function properly, and therefore, submarine cable systems also typically include an ocean grounding device (i.e., the ocean floor). The marine grounding device is typically installed at the distal end of the undersea optical cable system (i.e., in the ocean), and the electrical components in the undersea optical cable breakout equipment, as well as other electrical components of the undersea optical cable system, may be grounded through the marine grounding device to form a closed loop of electrical circuit.
Fig. 5 is a schematic diagram of the submarine fiber cable branch device provided by the embodiments of the present application being grounded via an ocean grounding device. As shown in fig. 5, in order to meet the construction and installation requirements of the marine grounding device 40 and the chemical corrosion requirements of seawater, the marine grounding device 40 may be a mechanical structure designed by using a titanium alloy as a base material after being subjected to a surface treatment by a metal oxide (MMO) coating process, and is installed on a submarine cable (i.e., the far end of the submarine cable branch device 50) away from the submarine cable branch device by a distance of more than 5 meters. The MMO coating treatment process is a process of coating ruthenium or iridium noble metal oxide on a titanium substrate or other corrosion-resistant materials through a special process so that the titanium substrate or other corrosion-resistant materials have good electrocatalytic activity and electrical conductivity. The MMO coating has low coating loss rate when used as an anode and can be prepared from chloride ions (Cl) in seawater-) Electrons are provided, thereby avoiding the consumption of the titanium alloy substrate.
When the marine grounding device 40 is used as the cathode of the current loop, hydrogen ions (H) in the seawater+) The electrons are obtained at the position of the ocean grounding device 40 to generate hydrogen, and as the distance between the ocean grounding device 40 and the submarine optical cable branch equipment is more than 5 meters and is far away, the hydrogen cannot flow to the vicinity of the submarine optical cable branch equipment, and the equipment main body part of the submarine optical cable branch equipment cannot be immersed in the hydrogen environment, so that the hydrogen generated by seawater electrolysis can be prevented from entering the bearingAnd in the pressure cylinder, the hydrogen loss effect of the internal unit is prevented from affecting optical devices and optical fibers in the submarine optical cable branch equipment 50. Wherein, the hydrogen loss effect refers to the hydrogen molecule is converted into silicon dioxide SiO2Diffusion in optical fiber, permeated free hydrogen being SiO at room temperature2The grids capture, under the action of the local electric field, dipole moments in hydrogen molecules and additional absorption loss is generated by the vibration of hydrogen.
Because the titanium alloy substrate adopted by the marine grounding device 40 is added with the MMO coating treatment process, when the marine grounding device 40 is used as the anode of the current loop, the marine grounding device is formed by chloride ions (Cl) in seawater-) Provide electrons and avoid the consumption of the titanium alloy base material. Thus, when the submarine cable system supplies power to each active device, the marine grounding device 40 as the positive electrode and the negative electrode does not consume the bulk substrate, so that the power supply flexibility of the submarine cable system is greatly enhanced, for example, when the submarine optical cable branch equipment 50 operates normally, the power supply branch of the submarine optical cable branch equipment 50 can be supplied with negative power, and in some electrical switching scenarios, the power supply branch of the submarine optical cable branch equipment 50 can be supplied with positive power.
It should be added that the submarine optical cable branching device and the technical concept thereof provided in the embodiments of the present application may also be applied to other devices and apparatuses of a submarine cable optical transmission system, such as a submarine line repeater, a submarine remote amplifier, and the like, which is not specifically limited in the embodiments of the present application.
It is understood that a person skilled in the art can combine, split, recombine and the like the embodiments of the present application to obtain other embodiments on the basis of several embodiments provided by the present application, and the embodiments do not depart from the scope of the present application.
The above embodiments are provided to explain the purpose, technical solutions and advantages of the present application in further detail, and it should be understood that the above embodiments are merely illustrative of the present application and are not intended to limit the scope of the present application, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present application should be included in the scope of the present application.

Claims (11)

1. An undersea optical fiber cable breakout device, comprising:
the bending device comprises a first bending limiter, a pressure bearing cylinder, a branch structure and two second bending limiters;
the first bending limiter, the pressure bearing cylinder, the branch structure and the two second bending limiters are connected in sequence;
the branch structure comprises a main path port and two branch path ports which are arranged in the opposite direction of the main path port, the pressure bearing cylinder is in threaded connection with the main path port, a threaded sealant is filled at the joint of the pressure bearing cylinder and the main path port, and the two second bending limiters are in one-to-one corresponding connection with the two branch path ports;
the pressure bearing cylinder is a metal cylinder, and an internal unit is arranged in the pressure bearing cylinder;
the bending and sealing device is characterized in that a first end cover is arranged at one end of the pressure bearing cylinder, which is connected with the first bending limiter, a second end cover is arranged at one end of the pressure bearing cylinder, which is connected with the branch structure, the first end cover is in threaded connection with the pressure bearing cylinder, the second end cover is in threaded connection with the pressure bearing cylinder, and watertight and airtight structures are arranged at the joint of the first end cover and the pressure bearing cylinder and the joint of the second end cover and the pressure bearing cylinder and filled with thread sealing glue.
2. Submarine optical cable branching apparatus according to claim 1,
the pressure-bearing cylinder sequentially comprises a central section, a first connecting section and a second connecting section along the direction close to the branch structure, and the central section, the first connecting section and the second connecting section are of an integrated structure;
the inner diameter of the first connecting section is larger than that of the central section so as to form a hole shoulder facing the branch structure at the junction of the first connecting section and the central section, the inner diameter of the second connecting section is larger than that of the first connecting section, and the inner wall of the first connecting section is provided with internal threads;
the second end cover is arranged in a space formed by the first connecting section and the second connecting section, and the diameter of the second end cover is larger than the inner diameter of the central section and smaller than the inner diameter of the second connecting section;
the edge of the second end cover extends towards the hole shoulder and the inner wall direction of the first connecting section in an inclined mode to form an outer peripheral face facing the end face of the hole shoulder and the inner wall of the first connecting section, the end face is attached to the hole shoulder, an external thread matched with the internal thread of the inner wall of the first connecting section is arranged on the outer peripheral face, and the outer peripheral face is in threaded connection with the inner wall of the first connecting section.
3. Submarine optical cable branching apparatus according to claim 2,
the first end cap and the second end cap are made of titanium alloy, and have the shapes protruding towards one side in an arc shape, and are used for separating optical fibers and cables in a submarine cable and then connecting the optical fibers and the cables into the internal unit for containing and fixing electric and optical elements.
4. Submarine optical cable branching apparatus according to claim 3,
the inner wall of the second connecting section is provided with internal threads;
the main road port includes the connecting tube head, the external diameter of connecting tube head with the internal diameter size phase-match of second linkage segment, the outer wall of connecting tube head be provided with the internal thread matched with external screw thread of the inner wall of second linkage segment, the outer wall of connecting tube head with the inner wall threaded connection of second linkage segment.
5. Submarine optical cable branching apparatus according to claim 4,
the branch structure further comprises a conical cylinder, the trunk port is connected with the two branch ports through the conical cylinder, and the size of a cavity of the conical cylinder is gradually increased from one end of the trunk port to one end of each branch port.
6. Submarine optical cable branching apparatus according to claim 4,
the second end cover is also provided with two photoelectric channels, and the two photoelectric channels comprise two through holes arranged in the center of the second end cover;
the through hole is used for leading the optical fiber and the cable out of the internal unit in the pressure bearing cylinder, and the optical fiber and the cable are separated from the second end cover through insulating materials.
7. Submarine optical cable branching apparatus according to claim 1,
an insulating jacket layer is arranged between the pressure bearing cylinder and the internal unit, and the insulating jacket layer is used for insulating the internal unit from the outside and conducting heat of the internal unit to the pressure bearing cylinder for heat dissipation.
8. Submarine optical cable branching apparatus according to claim 1,
the first bending limiter and the second bending limiter respectively comprise a universal joint and a sheath, the sheath is covered outside the universal joint, and the universal joint is formed by sequentially connecting a plurality of connecting rings which can generate twisting relative to each other;
the branch port is provided with a butt joint mechanism, one end of the second bending limiter is connected with the butt joint mechanism, and the other end of the second bending limiter is connected with the branch submarine cable sequentially through the universal connector and the buffer;
one end of the first bending limiter is connected with the pressure-bearing cylinder, and the other end of the first bending limiter is connected with the trunk submarine cable sequentially through the universal connector and the buffer.
9. The undersea optical fiber cable breakout device of claim 1, wherein the pressure bearing barrel is formed of a titanium alloy material and the main body of the breakout structure is formed of a high strength structural steel.
10. The undersea optical fiber cable breakout device according to claim 1, wherein said undersea optical fiber cable breakout device is grounded via an ocean grounding means to form a closed current loop with said internal unit.
11. Submarine optical cable branching apparatus according to claim 10,
the ocean grounding device is of a titanium alloy base material structure;
the ocean grounding device is arranged at the far end of the submarine optical cable branch equipment, so that when the ocean grounding device is used as a cathode of a current loop, hydrogen gas generated by hydrogen ions in seawater obtained by electrons occurs at one end far away from the submarine optical cable branch equipment, and when the ocean grounding device is used as an anode of the current loop, the ocean grounding device provides electrons by chlorine ions in seawater.
CN202111218098.4A 2021-10-20 2021-10-20 Submarine optical cable branch equipment Active CN113687485B (en)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8906505D0 (en) * 1989-03-21 1989-05-04 Stc Plc Jointing optical fibre cables
JPH0265615A (en) * 1988-08-31 1990-03-06 Fujitsu Ltd Unit structure of underwater branch device
US20030198027A1 (en) * 2002-04-23 2003-10-23 Taiichi Takeda Submarine branching unit
CN1790078A (en) * 2005-12-27 2006-06-21 江苏中天科技股份有限公司 Seabed optical cable branch joint box and connection process thereof
CN102540371A (en) * 2012-02-28 2012-07-04 中国电子科技集团公司第八研究所 Underwater one-to-many composite optical cable branching device
CN203839913U (en) * 2014-05-15 2014-09-17 国家海洋技术中心 Cable sealing device for underwater platform
CN109031568A (en) * 2018-10-24 2018-12-18 江苏亨通海洋光网***有限公司 Splitter for sea cable connection
WO2021003804A1 (en) * 2019-07-08 2021-01-14 江苏亨通海洋光网***有限公司 Flexible and expandable submarine cable amplifier structure
CN113391415A (en) * 2021-07-29 2021-09-14 华海通信技术有限公司 Bearing platform of optical signal amplification equipment

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0265615A (en) * 1988-08-31 1990-03-06 Fujitsu Ltd Unit structure of underwater branch device
GB8906505D0 (en) * 1989-03-21 1989-05-04 Stc Plc Jointing optical fibre cables
US20030198027A1 (en) * 2002-04-23 2003-10-23 Taiichi Takeda Submarine branching unit
CN1790078A (en) * 2005-12-27 2006-06-21 江苏中天科技股份有限公司 Seabed optical cable branch joint box and connection process thereof
CN102540371A (en) * 2012-02-28 2012-07-04 中国电子科技集团公司第八研究所 Underwater one-to-many composite optical cable branching device
CN203839913U (en) * 2014-05-15 2014-09-17 国家海洋技术中心 Cable sealing device for underwater platform
CN109031568A (en) * 2018-10-24 2018-12-18 江苏亨通海洋光网***有限公司 Splitter for sea cable connection
WO2021003804A1 (en) * 2019-07-08 2021-01-14 江苏亨通海洋光网***有限公司 Flexible and expandable submarine cable amplifier structure
CN113391415A (en) * 2021-07-29 2021-09-14 华海通信技术有限公司 Bearing platform of optical signal amplification equipment

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