Optical cable lightning resistance interruption box

Abstract

This application discloses an optical cable lightning protection box, including a box body and a curved conduit located inside the box body. The curved conduit extends in a bent direction along the optical cable inlet to the optical cable outlet of the box body. The portion of the optical cable's reinforcing core extending into the box body includes two reinforcing core segments, one of which is located between the optical cable inlet and the end of the curved conduit facing the optical cable inlet, and the other reinforcing core segment is located between the end of the curved conduit facing the optical cable outlet and the optical cable outlet. The optical fiber bundle tube of the optical cable passes through the curved conduit. The inner diameter of the curved conduit at the bend is smaller than the inner diameter at other locations of the curved conduit, and the radius of curvature at the bend is not less than 4 cm. Reinforcing core fixing components are provided at the corresponding positions of the reinforcing core segments inside the box body, and the reinforcing core fixing component near the optical cable inlet is grounded. The optical cable lightning protection box provided by this application can improve the lightning protection effect and effectively protect the equipment in the computer room.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a lightning protection box for optical cables. Background Technology

[0002] The operator's transmission network uses a large number of optical cables for data transmission. These optical cables are laid in various outdoor scenarios, such as mountains, cities, and wilderness, and can be laid in the form of direct burial, overhead, and pipeline.

[0003] Outdoor optical cables are highly susceptible to lightning and high-voltage electricity, which can cause the cables to become electrified and burn, damaging equipment in the central office and causing safety accidents. Therefore, how to prevent lightning and high-voltage electricity from entering the central office has become a key concern. Utility Model Content

[0004] This application provides an optical cable lightning protection box to address some of the deficiencies mentioned in the background technology, effectively blocking high-voltage electricity, lightning, and other electric currents from entering the computer room, thereby protecting the equipment in the computer room.

[0005] This application provides an optical cable lightning protection box, including a box body and a curved pipe located inside the box body; One end of the box has an optical cable inlet, and the other end of the box has an optical cable outlet. The curved pipe extends in a bent manner along the direction from the optical cable inlet to the optical cable outlet. The portion of the reinforcing core of the optical cable extending into the housing includes two reinforcing core segments. One reinforcing core segment is located between the optical cable inlet and the end of the curved conduit facing the optical cable inlet, while the other reinforcing core segment is located between the end of the curved conduit facing the optical cable outlet and the optical cable outlet. The optical fiber bundle tube of the optical cable passes through the curved conduit. The inner diameter of the bend in the curved conduit is smaller than the inner diameter at other locations in the curved conduit, and the radius of curvature at the bend in the curved conduit is not less than 4 cm. The box contains reinforcing core fixing components at the positions corresponding to the two reinforcing core segments, and the reinforcing core fixing components near the optical cable entrance are grounded.

[0006] Optionally, the curved pipe wall is provided with a sealable first insulating medium injection port, which is used to inject a first insulating medium into the curved pipe so that the first insulating medium fills the gap between the inner wall of the curved pipe and the optical fiber bundle tube.

[0007] Optionally, a peripheral cavity is formed between the outer wall of the curved pipe and the inner wall of the box, and the peripheral cavity is filled with a second insulating medium.

[0008] Optionally, the housing is provided with a sealable filling port, which is used to inject the second insulating medium into the peripheral cavity; And / or, the second insulating medium is quartz sand.

[0009] Optionally, the wall of the curved pipe is provided with a fixing structure for fixing the optical fiber bundle tube.

[0010] Optionally, the inner diameter of the curved pipe at the bend ranges from 1cm to 2.6cm.

[0011] Optionally, the reinforcing core fastener includes a fastening outer sleeve and an inner fastener; The fixing jacket has a first hollow channel with open ends for the reinforcing core segment to extend into, and the fixing jacket of the reinforcing core fixing member near the optical cable entrance is grounded; The internal fixation member has a second hollow channel. The internal fixation member can enter the first hollow channel from the end of the first hollow channel near the curved pipe, so that the reinforcing core segment extends into the second hollow channel. The internal fixation member can undergo elastic deformation under the compression of the fixing sleeve to fasten the reinforcing core segment.

[0012] Optionally, the inner diameter of the first hollow channel gradually decreases in the direction away from the curved pipe.

[0013] Optionally, the outer diameter of the inner fixing member gradually decreases in the direction away from the curved pipe.

[0014] Optionally, the internal fixation member includes two metal fixing parts disposed opposite to each other, and the two metal fixing parts are connected by an elastic structure. The two metal fixing parts and the elastic structure together define the second hollow channel. At least a portion of the metal fixing parts are in contact with the fixing outer sleeve, and the reinforcing core segment is in contact with the metal fixing parts.

[0015] Optionally, the inner fixation member is provided with a first engaging portion, and the fixing outer sleeve is provided with a second engaging portion. The second engaging portion matches and engages with the first engaging portion to position the inner fixation member after it enters the first hollow channel. And / or, the internal fixation member is provided with a push-in part, which is used to push the internal fixation member into the first hollow channel from the end of the first hollow channel near the curved pipe.

[0016] Optionally, a grounding post is provided on the fixing sleeve of the reinforcing core fixing member near the optical cable inlet, and a clearance hole is provided on the box body for the grounding post to extend out of the box body, and the grounding post is connected to an external grounding system; The grounding post and the fixing jacket are integrally formed.

[0017] Optionally, the housing includes a first housing and a second housing that are disposed opposite to each other and detachably connected; The first box body has a first curved groove on its inner wall, and the second box body has a second curved groove on its inner wall. When the first box body and the second box body are connected together, the first curved groove and the second curved groove are matched to form the curved pipe; and / or, a sealing strip is provided at the joint between the first box body and the second box body. And / or, the optical cable inlet and the optical cable outlet are respectively provided with sealing elements.

[0018] The optical cable lightning arrester box provided in this application embodiment has an optical cable inlet and an optical cable outlet. A curved pipe extending from the optical cable inlet to the optical cable outlet is provided in the box. The portion of the optical cable reinforcing core that extends into the box includes two reinforcing core segments. One segment is located between the optical cable inlet and the curved pipe inlet, and the other segment is located between the curved pipe outlet and the optical cable outlet, so that the optical fiber bundle tube of the optical cable passes through the curved pipe. In other words, the reinforcing core of the optical cable is prevented from passing through the curved conduit; that is, the portion of the reinforcing core corresponding to the curved conduit is cut off, leaving only the reinforcing core segments at both ends. This prevents high-voltage electricity or lightning from being conducted to the equipment room equipment through the reinforcing core, effectively protecting the equipment room equipment. By installing reinforcing core fixing components at the positions corresponding to the two reinforcing core segments inside the box, and grounding the reinforcing core fixing component near the optical cable entry, the stability of the optical cable is improved through the fixing component. Furthermore, when lightning current flows into the reinforcing core segment at the optical cable entry, the lightning current can be conducted to the ground through the reinforcing core fixing component near the optical cable entry, effectively protecting the equipment room equipment.

[0019] By inserting an optical fiber bundle containing optical fibers into a curved conduit, and ensuring that the inner diameter of the bend in the curved conduit is smaller than that of other parts of the conduit, the smaller the inner diameter, the greater the heat generation. Therefore, in the event of high voltage or strong lightning strikes, the optical fiber at the bend will be the first to overheat and fuse, promptly cutting off the current path and preventing high voltage or lightning current from entering the equipment room, effectively ensuring the safety of the equipment within the room. Simultaneously, ensuring that the radius of curvature at the bend of the curved conduit is not less than 4cm guarantees that the degree of bending at the bend is not too great, preventing excessive stress on the optical fiber during bending. This protects the optical fiber inserted in the curved conduit, preventing breakage and ensuring stable transmission of optical signals.

[0020] Moreover, since the pipe through which the fiber optic bundle passes between the two reinforcing core segments is a curved pipe, the breakdown distance is increased compared to a straight pipe, thereby improving the lightning protection effect. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the optical cable structure after the reinforcing core is cut, according to an embodiment of this application. Figure 2 This is a schematic diagram of the internal structure of the optical cable lightning resistor break box according to an embodiment of this application; Figure 3 This is a partial structural schematic diagram of the optical cable lightning resistor break box according to an embodiment of this application; Figure 4 This is a schematic diagram of the fixing sleeve of the reinforcing core fixing member in the optical cable lightning resistance box according to an embodiment of this application; Figure 5 for Figure 4 A side view diagram of the corresponding fixed outer jacket with a reinforcing core segment inserted; Figure 6 This is a schematic diagram of the internal fixing component of the reinforcing core fixing component in the optical cable lightning resistor break box according to an embodiment of this application; Figure 7 for Figure 6 The corresponding side view structural diagram.

[0022] Explanation of reference numerals in the attached figures: 1. Optical cable; 11. Sheath; 12. Reinforcing core segment; 13. Optical fiber bundle tube; 2. Housing; 20. Bent-type tube; 201. First insulating medium injection port; 202. Fixing structure; 21. Optical cable inlet; 22. Optical cable outlet; 23. Outer cavity; 24. First housing; 241. First bent-type groove; 25. Second housing; 26. Filling port; 27. Sealing strip; 28. Clearance hole; 29. ​​Connection hole; 3. Reinforcing core fixing component; 31. Fixing jacket; 311. First hollow channel; 312. Second engaging part; 313. Grounding post; 314. Grounding hole; 32. Inner fixing component; 321. Second hollow channel; 322. Metal fixing part; 323. Elastic structure; 324. First engaging part; 325. Push-in part. Detailed Implementation

[0023] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present application are shown in the drawings, not the entire structure.

[0024] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to". The concepts of "first," "second," etc., used in this application are only used to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies. It should be noted that the modifications "a" or "a plurality of" used in this application are illustrative rather than restrictive, and those skilled in the art should understand that, unless explicitly stated in the context, they should be understood as "one or more".

[0025] The operator's transmission network uses a large amount of fiber optic cable for data transmission, and this portion of the cable is laid outdoors. (See reference...) Figure 1 As shown, optical cable 1 specifically includes a sheath 11, a reinforcing core, and optical fibers. The optical fibers are located within an optical fiber bundle 13 and are used to transmit optical signals. The optical fiber bundle 13 and the reinforcing core are located within the sheath 11, and the reinforcing core at least serves to enhance the strength of optical cable 1. Figure 1 The diagram shows a structural schematic of the reinforcing core segment 12, where only the two ends are retained after the reinforcing core has been cut off.

[0026] The number of fiber cores in an optical cable can be set according to actual needs, such as 24-core, 36-core, 48-core, 72-core, 144-core, and 288-core optical cables. For example, if 12 optical fibers are placed in one fiber optic tube, then the sheath of a 24-core optical cable has 2 tubes, the sheath of a 48-core optical cable has 4 tubes, the sheath of a 72-core optical cable has 6 tubes, the sheath of a 144-core optical cable has 12 tubes, and the sheath of a 288-core optical cable has 24 tubes.

[0027] Outdoor fiber optic cables are introduced into the equipment room and connected to the equipment there to enable data transmission. In the event of high voltage or lightning strikes, the outdoor fiber optic cables may become electrified and burn, causing damage to the equipment inside the equipment room.

[0028] This application provides a fiber optic cable lightning protection box, which can be installed outside the equipment room, such as on the wall outside the equipment room, to enable the access of the fiber optic cable, effectively blocking high voltage and lightning from entering the equipment room, and thus protecting the equipment in the equipment room.

[0029] Reference Figures 1 to 7 As shown, the optical cable lightning protection box provided in this embodiment includes: a box body 2 and a curved pipe 20 located inside the box body 2.

[0030] One end of the housing 2 has an optical cable inlet 21, and the other end of the housing 2 has an optical cable outlet 22. The curved conduit 20 extends in a bent direction from the optical cable inlet 21 to the optical cable outlet 22.

[0031] Reference Figure 2 As shown, the curved pipe 20 can specifically be an S-shaped pipe. In other implementations, the curved pipe 20 can also be a spiral pipe, a serrated pipe, etc.

[0032] The reinforcing core is specifically a metal reinforcing core. The portion of the reinforcing core of the optical cable 1 that extends into the housing 2 includes two reinforcing core segments 12. One reinforcing core segment 12 is located between the optical cable inlet 21 and the end of the curved conduit 20 facing the optical cable inlet 21, while the other reinforcing core segment 12 is located between the end of the curved conduit 20 facing the optical cable outlet 22 and the optical cable outlet 22. The fiber optic bundle of the optical cable 1 is threaded through the curved conduit 20.

[0033] In other words, the part of the reinforcing core of the optical cable 1 that extends into the housing 2 does not pass through the curved pipe 20. That is, the part of the reinforcing core corresponding to the curved pipe 20 is cut off, and only the reinforcing core section 12 (near the optical cable inlet 21) and the reinforcing core section 12 (near the optical cable outlet 22) as the lead-in section are retained. Only the optical fiber bundle tube 13 is installed in the curved pipe 20. This can prevent high voltage or lightning from being conducted to the equipment room equipment through the reinforcing core, thus effectively protecting the equipment room equipment. The optical signal is transmitted without loss through the optical fiber in the optical fiber bundle tube within the curved pipe 20.

[0034] In this design, the inner diameter of the bend in the curved conduit 20 is smaller than the inner diameter at other locations. It is understandable that, based on current characteristics and thermal properties, a thicker conductor has a larger heat dissipation area, allowing it to dissipate heat generated by the current more effectively and thus withstand higher currents without overheating or damage. A narrower conductor has a smaller heat dissipation area, dissipates heat more slowly, and is less able to withstand high currents, potentially leading to overheating and melting. In other words, the smaller the diameter, the greater the heat generation. Therefore, in the event of high voltage or excessive lightning strikes, the optical fiber at the bend can directly overheat and melt, thus cutting off the current path and preventing high voltage or lightning strikes from entering the equipment room.

[0035] The radius of curvature at the bend of the curved duct 20 is not less than 4 cm. This ensures that the degree of bending at the bend of the curved duct 20 is not too large, thus preventing the optical fiber running through the curved duct 20 from being bent too much. This ensures that the optical fiber is not subjected to excessive stress during bending, protecting the optical fiber running through the curved duct 20 and preventing it from being broken, thereby ensuring stable transmission of optical signals.

[0036] Reinforcing core fixing components 3 are provided at the positions corresponding to the two reinforcing core segments 12 inside the housing 2, and the reinforcing core fixing components 3 near the optical cable inlet 21 are grounded. By setting the reinforcing core fixing components 3 to fix the reinforcing core segments 12 located on the outer sides of both ends of the curved duct 20, the stability of the optical cable 1 is improved.

[0037] In practice, before the outdoor optical cable 1 enters the equipment room, the optical cable 1 is first connected to the optical cable lightning protection box. The sheath 11 of the portion of the optical cable 1 connected to the box 2 is longitudinally cut to expose the reinforcing core and the fiber optic bundle tube. The portion of the reinforcing core corresponding to the curved pipe 20 is cut off, leaving two reinforcing core segments 12. The fiber optic bundle tube is then inserted into the curved pipe 20. The reinforcing core segments 12 on both sides of the curved pipe 20 are fixed by the reinforcing core fixing component 3. The reinforcing core fixing component 3 near the optical cable entrance 21 is grounded. Thus, in the event of high voltage or lightning, the high voltage or lightning current can be conducted to the ground through the reinforcing core fixing component 3, improving the lightning protection effect.

[0038] The optical cable lightning arrester box provided in this application embodiment has a box body 2 with an optical cable inlet 21 and an optical cable outlet 22. A curved pipe 20 is provided inside the box body 2, which extends in the direction from the optical cable inlet 21 to the optical cable outlet 22. The portion of the reinforcing core of the optical cable 1 that extends into the box body 2 includes two reinforcing core segments 12, one of which is located between the optical cable inlet 21 and the inlet of the curved pipe 20, and the other of which is located between the outlet of the curved pipe 20 and the optical cable outlet 22. The optical fiber bundle tube of the optical cable 1 is passed through the curved pipe 20. In other words, by preventing the reinforcing core of optical cable 1 from passing through the curved conduit 20, that is, by cutting off the portion of the reinforcing core corresponding to the curved conduit 20, high voltage or lightning is prevented from being conducted to the equipment room equipment through the reinforcing core, thus effectively protecting the equipment room equipment. By setting reinforcing core fixing parts 3 at the positions corresponding to the two reinforcing core segments 12 inside the housing 2, and grounding the reinforcing core fixing parts 3 near the optical cable entrance 21, the stability of optical cable 1 is improved by fixing the reinforcing core segments 12 through the reinforcing core fixing parts 3. Furthermore, when lightning current flows into the reinforcing core segment 12 at the optical cable entrance, the lightning current can be conducted to the ground through the reinforcing core fixing parts 3, thus effectively protecting the equipment room equipment.

[0039] By inserting an optical fiber bundle containing optical fibers into a curved pipe 20, the inner diameter of the bend in the curved pipe 20 is made smaller than the inner diameter at other locations. Since a smaller inner diameter results in greater heat generation, when a high-voltage power surge or a strong lightning strike occurs, the optical fiber at the bend will overheat and fuse first, promptly cutting off the current path and preventing high voltage or lightning current from entering the equipment room, effectively ensuring the safety of the equipment in the equipment room. At the same time, the radius of curvature at the bend of the curved pipe 20 is not less than 4cm, ensuring that the degree of bending at the bend is not too large, and ensuring that the optical fiber is not subjected to excessive stress during bending. This protects the optical fiber inserted in the curved pipe 20, preventing the optical fiber from being broken, and thus ensuring stable transmission of optical signals.

[0040] Moreover, since the pipe through which the fiber bundle tube passes between the two reinforcing core segments is a curved pipe 20, the breakdown distance is increased compared to a straight pipe, thereby improving the lightning protection effect.

[0041] In practice, the length of the enclosure 2 can be determined based on the environment in which the blocking box is located. For example, in an environment with voltages below 100 kV, the internal clearance of the enclosure 2 should be no less than 40 cm. In an environment exposed to lightning strikes, the internal clearance of the enclosure 2 can be increased to 80 cm or even longer.

[0042] Reference Figure 2 and Figure 3As shown, the box body 2 may include: a first box body 24 and a second box body 25 arranged opposite to each other. The inner wall of the first box body 24 is provided with a first curved groove 241, and the inner wall of the second box body 25 is provided with a second curved groove (not shown in the figure). When the first box body 24 and the second box body 25 are connected together, the first curved groove 241 and the second curved groove are matched to form a curved pipe 20.

[0043] For example, the reinforcing core fixing member 3 is disposed on the first housing 24. In a specific implementation, the optical cable 1 is inserted into the housing 2 from the optical cable inlet 21, and the other end of the optical cable 1 extends out from the optical cable outlet 22. The sheath 11 of the optical cable 1 inserted into the housing 2 is longitudinally cut open to expose the optical fiber bundle tube and the reinforcing core. The portion of the reinforcing core corresponding to the first curved groove 241 is cut off, that is, a section of reinforcing core 12 located between the inlet of the first curved groove 241 and the optical cable inlet 21 and a section of reinforcing core 12 located between the outlet of the first curved groove 241 and the optical cable outlet 22 are left. The optical fiber bundle tube is placed into the first curved groove 241. The reinforcing core sections 12 at both ends are fixed by the reinforcing core fixing member 3, and the reinforcing core section 12 near the optical cable inlet 21 is grounded. Then, the second housing 25 is closed and connected to the first housing 24. At this time, the second curved groove and the first curved groove 241 are aligned and together form a curved tube 20. The above settings are convenient and reduce the difficulty of operation.

[0044] In some embodiments, the first box 24 and the second box 25 can be detachably connected. In this way, if the first box 24, the second box 25, or a component inside the box 2 needs to be repaired or maintained, the first box 24 and the second box 25 can be separated, making repair or maintenance more convenient, avoiding the scrapping of the entire blocking box, and saving costs.

[0045] Reference Figure 2 As shown, for example, the edges of the first box 24 and the second box 25 are respectively provided with connecting holes 29, and the first box 24 and the second box 25 are connected together by screws or bolts passing through the corresponding connecting holes 29. Of course, in other implementations, the first box 24 and the second box 25 can also be connected by a snap-fit ​​and snap-hole mechanism.

[0046] Continue to refer to Figure 2 As shown, in some embodiments, a sealable first insulating medium injection port 201 is provided on the wall of the curved pipe 20. The first insulating medium injection port 201 is used to inject a first insulating medium into the curved pipe 20 so that the first insulating medium fills the gap between the inner wall of the curved pipe 20 and the optical fiber bundle tube.

[0047] In a specific implementation, a sealing plug is provided on the first insulating medium injection port 201, for example, the sealing plug is connected to the first insulating medium injection port 201 in a sealed manner by threads.

[0048] By filling the space between the curved conduit 20 and the fiber optic bundle tube with a first insulating medium, the insulation performance is further improved, which can effectively enhance the insulation effect of the entire box 2, thereby further improving the protection against lightning and high voltage.

[0049] In practice, the first insulating medium can be transformer insulating oil, which has good insulating properties, is non-toxic and low in cost, and will not affect the optical fiber.

[0050] The curved conduit 20 and the transformer insulating oil inside it primarily serve the exposed fiber optic bundles, providing them with insulation, heat dissipation, and physical protection, and ultimately blocking energy by overheating and fusing the fiber optic bundles themselves in extreme cases.

[0051] Of course, in other implementations, the first insulating medium can also be other insulating materials such as silicone oil.

[0052] In some embodiments, a sealing element is also provided at the optical cable inlet 21 and the optical cable outlet 22. The sealing element is used to seal the optical cable 1, which serves to prevent water and insects, and can also prevent the first insulating medium, such as transformer insulating oil, from flowing out from the optical cable inlet 21 or the optical cable outlet 22.

[0053] The sealing element can be, for example, sealing tape, which is wrapped around the outer perimeter of the optical cable 1 at the optical cable inlet 21 and optical cable outlet 22. Of course, the sealing element can also be a sealing ring, etc.

[0054] Continue to refer to Figure 2 As shown, in some embodiments, a peripheral cavity 23 is formed between the outer wall of the curved pipe 20 and the inner wall of the box 2, and the peripheral cavity 23 is filled with a second insulating medium.

[0055] By filling the outer cavity 23 with a second insulating medium, the insulation effect of the entire box 2 is further improved, thereby enhancing the protection against lightning and high voltage.

[0056] The housing 2 is provided with a sealable filling port 26, which is used to inject a second insulating medium into the outer cavity 23. This facilitates the injection of the second insulating medium. In practice, a sealing plug is provided on the filling port 26, for example, the sealing plug is connected to the filling port 26 by threads for a sealing connection.

[0057] The second insulating medium can be silica sand. When lightning strikes or high voltage occurs, an electric arc may be generated. Silica sand can quickly absorb the energy of the arc and help extinguish it rapidly, thereby enhancing the safety of the entire device, preventing the arc from spreading, and further improving the lightning protection effect.

[0058] Of course, in other implementations, the second insulating medium can also be a ceramic insulating material.

[0059] To improve the sealing performance of box 2, refer to Figure 2 As shown, a sealing strip 27 can also be provided at the joint of the first box 24 and the second box 25 to serve as a waterproof and insect-proof measure, and to prevent leakage of the second insulating medium.

[0060] In some embodiments, the curved pipe 20 is provided with a fixing structure 202 for fixing the optical fiber bundle tube.

[0061] Reference Figure 2 As shown, the fixing structure 202 may include fixing holes. The fixing holes are set on the groove wall of the first curved groove 241. The fiber optic bundle tube is fixed in the first curved groove 241 by the binding strap or cable tie inserted in the fixing holes, so as to prevent the fiber optic bundle tube from shaking or shifting, improve the stability of the fiber optic bundle tube, and thus improve the operating efficiency.

[0062] In addition, the fixing structure 202 can also be a fixing clip installed in the curved pipe 20. The fixing clip has an elastic opening through which the fiber optic bundle tube can enter the inner cavity of the fixing clip.

[0063] In some embodiments, the inner diameter (i.e., diameter) of the bent pipe 20 at the bend can be set between 1 cm and 2.6 cm.

[0064] For example, the diameter of the bend is 1 cm for a 24-core loose-tube optical cable. For a 36-core loose-tube optical cable, the diameter is 1.1 cm. For a 48-core loose-tube optical cable, the diameter is 1.3 cm. For a 72-core loose-tube optical cable, the diameter is 1.6 cm. For a 144-core loose-tube optical cable, the diameter is 2.6 cm. For a 288-core loose-tube optical cable, the diameter is 2.6 cm.

[0065] For the sake of versatility, the inner diameter of the bend in the curved tube 20 of 72-core and below can be set to 1.6cm, and the inner diameter of the non-bend can be set to 2.6cm; for 144-core and 288-core cables, the inner diameter of the bend can be set to 2.6cm, and the inner diameter of the non-bend can be set to 3.3cm.

[0066] Taking the S-shaped pipe 20 as an example, the calculation of the inner diameter at the bend of the S-shaped pipe is illustrated as follows: Taking GYTS (stranded outdoor optical fiber cable) as an example, 12 optical fibers are placed in a loose tube, which is typically 5mm in diameter.

[0067] Common core counts are 24 cores (2 bundle tubes), 48 cores (4 bundle tubes), 72 cores (6 bundle tubes), 144 cores (12 bundle tubes), and 288 cores (24 bundle tubes).

[0068] For 24-core loose tube optical cables: The internal diameter of the bend corresponding to 24 cores (2 bundles) is 5mm + 5mm = 10mm.

[0069] For 36-core loose tube optical cables: The diameter of the 36-core (3 bundle tubes) is 11mm.

[0070] Among them, the three bundles are arranged in an equilateral triangle.

[0071] 1) Radius of the small circle (radius of the bundle tube): r = 5 / 2 = 2.5 mm.

[0072] 2) The centers of the three small circles form an equilateral triangle: The length of each side is the sum of the radii of the two smaller circles: a = r + r = 5 mm; The radius of the circumcircle of the equilateral triangle (i.e., the distance from the center of the triangle to any vertex) is:

[0073] 3) Radius of the larger circle = Radius of the smaller circle + Radius of the circumcircle of the equilateral triangle:

[0074] 4) Diameter of the great circle:

[0075] Numerical calculation:

[0076] Including the allowance, the total internal diameter is 11mm, or 1cm.

[0077] For 48-core loose tube optical cables: The diameter of the 48 cores (4 bundles) is 13mm.

[0078] The four bundles are arranged in a square layout.

[0079] 1) Radius of the small circle (radius of the bundle tube): r = 5 / 2 = 2.5 mm.

[0080] 2) Arrangement of the four small circles: When four identical small circles are placed inside a large circle and are tangent to each other, the most compact arrangement is to form a square shape, where the centers of the four small circles form a square, and the length of each side is the diameter of two small circles (the small circles are tangent to each other). The side length of the square is: a = 2r + 2r = 5mm; Length of the diagonal of the square (connecting the centers of two opposite smaller circles):

[0081] 3) Radius of the great circle: The distance from the center of the large circle to the center of any small circle is equal to the distance from the center of the large circle to the center of the square plus the radius of the small circle.

[0082] Wherein, the distance from the center of the square to any vertex (i.e., the radius of the circumcircle):

[0083] Therefore, the radius of the great circle is:

[0084] 4) Diameter of the great circle:

[0085] Including the allowance, the total internal diameter is 13mm, or 1.3cm.

[0086] For 72-core loose tube optical cables: The diameter of the 72-core (6 bundle tubes) is 16mm.

[0087] The six bundles are arranged in a hexagonal pattern.

[0088] 1) Radius of the small circle (radius of the bundle tube): r = 5 / 2 = 2.5 mm.

[0089] 2) The radius of the circumcircle of a regular hexagon (the distance from the center to the vertex): In a regular hexagon, the radius of the circumcircle is equal to the side length (because it is an equilateral hexagon), so Rhex = 5mm.

[0090] 3) Radius of the great circle: The radius of the larger circle = the distance from the center of the regular hexagon to the center of the smaller circle + the radius of the smaller circle, that is... R = Rhex + r = 5 + 2.5 = 7.5mm 4) Great circle diameter: D=2R=15mm Adding a 1mm allowance, the total internal diameter is 16mm, or 1.6cm.

[0091] For 144-core loose tube optical cables: The diameter of the 144 cores (12 bundles) is 26 mm.

[0092] The first layer consists of 1 bundle tube; the second layer consists of 6 bundle tubes; and the third layer consists of 5 bundle tubes.

[0093] The center of the first layer is the center of the large circle; the distance between the center of the second layer and the center is 2R = 5mm; the distance between the center of the third layer and the center is approximately 4R = 10mm. Where, the radius of the large circle = the distance from the center of the third layer of small circles to the center of the large circle + the radius of the small circles, that is... R = 10 + 2.5 = 12.5 mm; Therefore, the diameter of the great circle D = 2R = 2 × 12.5 = 25 mm; Adding an additional 1mm allowance, the total internal diameter is 26mm, or 2.6cm.

[0094] For 288-core loose tube optical cables: The diameter of the 288 cores (24 bundles) is 26 mm.

[0095] The first layer consists of 1 bundle tube; the second layer consists of 6 bundle tubes; and the third layer consists of 17 bundle tubes.

[0096] The center of the first layer is the center of the large circle; the distance between the center of the second layer and the center is 2R = 5mm; the distance between the center of the third layer and the center is approximately 4R = 10mm. Where, the radius of the large circle = the distance from the center of the third layer of small circles to the center of the large circle + the radius of the small circles, that is... R = 10 + 2.5 = 12.5 mm; Therefore, the diameter of the great circle D = 2R = 2 × 12.5 = 25 mm; Adding an additional 1mm allowance, the total internal diameter is 26mm, or 2.6cm.

[0097] Calculation of the radius of curvature at the bend of the curved pipe 20: The minimum radius of curvature of a single-mode fiber is 20 times its outer diameter. Considering that the fiber is placed inside a bundle tube, the fiber diameter is calculated with reference to the pigtail diameter. The pigtail diameter (including the sheath) is 2mm, so the minimum radius of curvature of the single-mode fiber is 2mm × 20 = 40mm = 4cm.

[0098] In the case of curved pipes, the non-bend points should be increased by 7-10mm compared to the bend points. For example, for boxes with 144 cores or more, the increase is 7mm; for boxes with fewer than 144 cores, the increase is 10mm. This is to fully consider the internal space of the box.

[0099] Reference Figures 3 to 7As shown, in some embodiments, the reinforcing core fixing member 3 specifically includes a fixing outer sleeve 31 and an inner fixing member 32. The fixing outer sleeve 31 has a first hollow channel 311 with openings at both ends, allowing the reinforcing core segment 12 to extend into it. The fixing outer sleeve 31 of the reinforcing core fixing member 3 near the optical cable inlet 21 is grounded.

[0100] The inner fixing member 32 has a second hollow channel 321. The inner fixing member 32 can enter the first hollow channel 311 from the end of the first hollow channel 311 near the curved pipe 20, so that the reinforcing core segment 12 extends into the second hollow channel 321. The inner fixing member 32 can undergo elastic deformation under the compression of the fixing sleeve 31 to fasten the reinforcing core segment 12.

[0101] Reference Figure 3 As shown, the inner fixing member 32 can enter the first hollow channel 311 from the right end. During the process of the inner fixing member 32 entering, the fixing sleeve 31 squeezes the inner fixing member 32. Since the inner fixing member 32 can undergo elastic deformation, the inner fixing member 32 contracts under the squeezing action of the fixing sleeve 31, thereby playing the role of wrapping and fastening the reinforcing core segment 12 that extends into the second hollow channel 321, improving the stability of the reinforcing core segment 12, and thus improving the stability of the optical cable.

[0102] Because the inner fastener 32 can undergo elastic deformation, and the inner fastener 32 cooperates with the above-mentioned structure of the fixing jacket 31, the reinforcing core fastener 3 can be used to fix a variety of reinforcing cores of different thicknesses. During the fixing process, the fixing force and position can be automatically adjusted according to the thickness of the reinforcing core, thus achieving good versatility.

[0103] Continue to refer to Figures 3 to 5 As shown, in some embodiments, the inner diameter of the first hollow channel 311 gradually decreases in the direction away from the curved pipe 20. Specifically, the inner wall of the first hollow channel 311 is formed as a slope. Figure 3 and Figure 4 For example, the inner diameter of the first hollow channel 311 here is... Figure 4 Dimension a in the direction away from the curved pipe 20, i.e., along Figure 3 and Figure 4 In the direction from right to left.

[0104] This configuration allows the inner fixing member 32 to be effectively compressed by the channel wall of the first hollow channel 311 during the process of the inner fixing member 32 entering the first hollow channel 311, causing the inner fixing member 32 to contract. This effectively wraps and tightens the reinforcing core segment 12 that passes through the second hollow channel 321 of the inner fixing member 32, further improving the fixing effect.

[0105] Furthermore, referring to Figure 3 , Figure 6 and Figure 7 As shown, in some embodiments, the outer diameter of the inner fastener 32 gradually decreases in the direction away from the curved pipe 20. That is, the inner fastener 32 can be formed as a cone-shaped structure, and the outer wall surface of the inner fastener 32 is formed as an inclined surface.

[0106] by Figure 6 For example, the outer diameter of the internal fastener 32 here refers to Figure 6 Dimension b in the text. Here, "along the direction away from the curved pipe 20" refers to... Figure 3 and Figure 6 The direction from right to left in the middle.

[0107] This arrangement ensures that the fixed outer sleeve 31 effectively compresses the inner fixing member 32, causing the inner fixing member 32 to contract and increasing the friction between the inner fixing member 32 and the reinforcing core segment 12. At the same time, it guides the entry of the inner fixing member 32, making the inner fixing member 32 enter the first hollow channel 311 more smoothly and the operation more convenient and labor-saving.

[0108] Continue to combine Figure 3 , Figure 6 and Figure 7 As shown, in some embodiments, the inner fixing member 32 includes two metal fixing parts 322 disposed opposite to each other, and the two metal fixing parts 322 are connected by an elastic structure 323. The two metal fixing parts 322 and the elastic structure 323 together define a second hollow channel 321. At least a portion of the metal fixing parts 322 are in contact with the fixing sleeve 31, and the reinforcing core segment 12 is in contact with the metal fixing parts 322.

[0109] When the inner fixing member 32 enters the first hollow channel 311, it is subjected to the squeezing force of the fixing jacket 31, and the elastic structure 323 undergoes elastic deformation, so that the two metal fixing parts 322 and the reinforcing core segment 12 generate effective friction force, which tightens the reinforcing core segment 12. This is suitable for fixing reinforcing cores of different thicknesses, automatically adjusting the tightening force, and this setting ensures the strength of the inner fixing member 32 and improves the stability of the inner fixing member 32.

[0110] Continue to refer to Figures 3 to 7 As shown, in some embodiments, the inner fixing member 32 is provided with a first engaging portion 324, and the fixing outer sleeve 31 is provided with a second engaging portion 312. The second engaging portion 312 matches and engages with the first engaging portion 324 to position the inner fixing member 32 after it enters the first hollow channel 311.

[0111] In other words, to ensure the safety and reliability of the reinforcing core fixing component 3 during use, a first engaging part 324 and a second engaging part 312 are provided to cooperate and position the inner fixing component 32 and the fixing outer sleeve 31. In this way, even under external impact or vibration, the reinforcing core can always remain fixed and will not loosen or fall off, effectively ensuring the normal operation of the optical cable 1 and the stability of communication.

[0112] In a specific implementation, the first engaging part 324 can be a notch, and the second engaging part 312 can be an anti-detachment buckle. For example, after the inner fixing member 32 enters the first hollow channel 311, the inner fixing member 32 can be rotated slightly to make the buckle correspond to the notch, thereby preventing the inner fixing member 32 from falling off.

[0113] Of course, in other implementations, the first engaging part 324 can also be a buckle, and the second engaging part 312 can be a notch.

[0114] In some embodiments, the inner fixing member 32 is provided with a push-in portion 325, which is used to push the inner fixing member 32 from one end of the first hollow channel 311 near the curved pipe 20 into the first hollow channel 311.

[0115] This design allows the inner fixing member 32 to be pushed into the first hollow channel 311 by pushing the push-in part 325, which improves the ease and efficiency of operation.

[0116] For example, the push-in portion 325 can be a push rod or a handle, etc., and when the inner fixing member 32 enters into the fixing sleeve 31, the push-in portion 325 is located on the outside of the fixing sleeve 31.

[0117] In some embodiments, a grounding post 313 is provided on the fixing sleeve 31 of the reinforcing core fixing member 3 near the optical cable inlet 21. A clearance hole 28 is provided on the housing 2 for the grounding post 313 to extend outside the housing 2. The grounding post 313 is connected to an external grounding system, thereby achieving grounding of the reinforcing core near the optical cable inlet 21. In the event of high voltage or lightning, the high voltage or lightning current can be conducted to the ground through the reinforcing core fixing member 3, improving lightning protection.

[0118] The grounding post 313 and the fixing sleeve 31 can be integrally formed. This improves the overall structural strength of the fixing sleeve 31 and the grounding post 313, facilitates assembly, and further enhances the lightning protection effect. For example, both the fixing sleeve 31 and the grounding post 313 are made of conductive metal.

[0119] For example, a grounding hole 314 is provided on the grounding post 313. The grounding hole 314 is used to connect the wire of the external grounding system to ensure the reliability and stability of the grounding connection.

[0120] For example, when it is necessary to fix the reinforcing core segment 12, the reinforcing core segment 12 of the optical cable 1 is first inserted through the small opening end of the fixing jacket 31, and then pushed into the inner fixing member 32 through the pushing part 325. As the pushing part 325 pushes, the inner fixing member 32 gradually enters the first hollow channel 311 of the fixing jacket 31. Due to the shape design of the inner fixing member 32 and the first hollow channel 311, the inner fixing member 32 will interact with the inner wall slope of the fixing jacket 31 during the process of entering the fixing jacket 31, generating a squeezing effect. This squeezing causes the elastic structure between the two metal fixing parts 322 of the inner fixing member 32 to be compressed, thereby generating an inward contraction force on the inner fixing member 32. This contraction force acts on the reinforcing core segment 12, and can use friction to firmly fix the reinforcing core segment 12 inside the inner fixing member 32.

[0121] Whether it is a traditional metal reinforcing core or a new type of non-metallic reinforcing core, such as glass fiber, aramid fiber and polyester fiber, stable fixation can be achieved in this way.

[0122] The design of the aforementioned reinforcing core fastener 3 fully considers the fixing requirements of reinforcing cores made of different materials. Whether it is a traditional metal reinforcing core or a new type of non-metallic reinforcing core, it can achieve stable and reliable fixing through this fastener. Its unique conical-shaped internal fastener structure makes the operation process extremely convenient. Construction personnel only need to simply push the push-in part 325 of the internal fastener 32 to complete the fixing of the reinforcing core segment, without the need for complicated tools and professional skills, which greatly improves construction efficiency. At the same time, the reinforcing core fastener 3 has a simple structure and few parts, reducing production and maintenance costs. In large-scale communication engineering construction and maintenance, this kind of easy-to-operate, simple-structured, and low-cost fastener can save operators a lot of human, material, and financial resources.

[0123] For non-metallic reinforcing cores used in general optical cables, their compressive strength is insufficient. If fixed with traditional nuts or by wrapping, they cannot withstand vertical shearing forces, leading to insecure fixation or even breakage. The aforementioned reinforcing core fixing component 3 can also fix non-metallic reinforcing cores without the need for nuts or wrapping, or complex tools, thus increasing the versatility of the component. This reinforcing core fixing component 3 can solve the problem of fixing reinforcing cores of different materials or sizes, and is simple to operate, has a compact structure, and is cost-effective.

[0124] The optical cable lightning protection junction box provided in this application embodiment can be applied to the lightning and electrical protection work of existing optical cables entering the office. Through the synergistic effect of the bent conduit 20, transformer insulating oil, and quartz sand, the optical cable lightning protection junction box provided in this application embodiment can effectively prevent damage to optical cables from lightning and high-voltage electricity, protect equipment in the equipment room, provide comprehensive security for the communication network, and is low in cost and easy to retrofit.

[0125] Compared to the previous approach of setting up an outdoor optical distribution box outside the equipment room, grounding the optical distribution box, and using non-metallic optical cables between the optical distribution box and the equipment room, and then grounding the non-metallic optical cables again on the optical distribution frame (ODF) after entering the equipment room, the optical cable lightning resistor break box provided in this application only requires vertically breaking the sheath of the optical cable connected to the box, cutting off the reinforcing core of the optical cable 1 that extends into the box 2, and fixing the remaining reinforcing core segments at both ends by the reinforcing core fixing component 3, so that the optical fiber bundle tube enters the curved pipe 20. There is no need for fiber core splicing or interruption of fiber core services. The operation process has little impact on the existing network, reduces construction costs and difficulties, and the transformation is quick and effective.

[0126] The above description is merely an embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of disclosure in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

[0127] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A lightning arrester box for optical cables, characterized in that, Includes a housing and a curved pipe located within the housing; One end of the box has an optical cable inlet, and the other end of the box has an optical cable outlet. The curved pipe extends in a bent manner along the direction from the optical cable inlet to the optical cable outlet. The portion of the reinforcing core of the optical cable extending into the housing includes two reinforcing core segments. One reinforcing core segment is located between the optical cable inlet and the end of the curved conduit facing the optical cable inlet, while the other reinforcing core segment is located between the end of the curved conduit facing the optical cable outlet and the optical cable outlet. The optical fiber bundle tube of the optical cable passes through the curved conduit. The inner diameter of the bend in the curved conduit is smaller than the inner diameter at other locations in the curved conduit, and the radius of curvature at the bend in the curved conduit is not less than 4 cm. The box contains reinforcing core fixing components at the positions corresponding to the two reinforcing core segments, and the reinforcing core fixing components near the optical cable entrance are grounded.

2. The optical cable lightning resistor break box according to claim 1, characterized in that, The curved pipe wall is provided with a sealable first insulating medium injection port, which is used to inject a first insulating medium into the curved pipe so that the first insulating medium fills the gap between the inner wall of the curved pipe and the optical fiber bundle tube.

3. The optical cable lightning resistor break box according to claim 1, characterized in that, An outer cavity is formed between the outer wall of the curved pipe and the inner wall of the box, and the outer cavity is filled with a second insulating medium.

4. The optical cable lightning resistor break box according to claim 3, characterized in that, The box body is provided with a sealable filling port, which is used to inject the second insulating medium into the outer cavity; And / or, the second insulating medium is quartz sand.

5. The optical cable lightning resistor break box according to claim 1, characterized in that, The curved pipe wall is provided with a fixing structure for fixing the optical fiber bundle tube.

6. The optical cable lightning resistor break box according to claim 1, characterized in that, The inner diameter of the curved pipe at the bend ranges from 1cm to 2.6cm.

7. The optical cable lightning protection junction box according to any one of claims 1 to 6, characterized in that, The reinforcing core fastener includes a fastening outer sleeve and an inner fastener; The fixing jacket has a first hollow channel with open ends for the reinforcing core segment to extend into, and the fixing jacket of the reinforcing core fixing member near the optical cable entrance is grounded; The internal fixation member has a second hollow channel. The internal fixation member can enter the first hollow channel from the end of the first hollow channel near the curved pipe, so that the reinforcing core segment extends into the second hollow channel. The internal fixation member can undergo elastic deformation under the compression of the fixing sleeve to fasten the reinforcing core segment.

8. The optical cable lightning resistor break box according to claim 7, characterized in that, The inner diameter of the first hollow channel gradually decreases in the direction away from the curved pipe.

9. The optical cable lightning resistor break box according to claim 8, characterized in that, The outer diameter of the inner fixing member gradually decreases in the direction away from the curved pipe.

10. The optical cable lightning resistor break box according to claim 7, characterized in that, The internal fixation member includes two metal fixing parts arranged opposite each other, and the two metal fixing parts are connected by an elastic structure. The two metal fixing parts and the elastic structure together define the second hollow channel. At least a portion of the metal fixing parts are in contact with the fixing outer sleeve, and the reinforcing core segment is in contact with the metal fixing parts.

11. The optical cable lightning resistor break box according to claim 7, characterized in that, The inner fixation member is provided with a first engaging part, and the fixing outer sleeve is provided with a second engaging part. The second engaging part matches and engages with the first engaging part to position the inner fixation member after it enters the first hollow channel. And / or, the internal fixation member is provided with a push-in part, which is used to push the internal fixation member into the first hollow channel from the end of the first hollow channel near the curved pipe.

12. The optical cable lightning resistor break box according to claim 7, characterized in that, A grounding post is provided on the fixing sleeve of the reinforcing core fixing member near the optical cable entrance. The box body is provided with a clearance hole for the grounding post to extend out of the box body. The grounding post is connected to an external grounding system. The grounding post and the fixing jacket are integrally formed.

13. The optical cable lightning resistance break box according to any one of claims 1 to 6, characterized in that, The housing includes a first housing and a second housing that are disposed opposite to each other and detachably connected; The first box body has a first curved groove on its inner wall, and the second box body has a second curved groove on its inner wall. When the first box body and the second box body are connected together, the first curved groove and the second curved groove are matched to form the curved pipe; and / or, a sealing strip is provided at the joint between the first box body and the second box body. And / or, a seal is provided at the optical cable inlet and the optical cable outlet respectively.

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