Optical cable ground safety isolation sealing device

Abstract

The invention relates to an optical cable ground safety isolation sealing device which comprises an upper end steel pipe optical fiber, a lower end steel pipe optical fiber, an upper end isolation sealing assembly, a lower end isolation sealing assembly, an optical fiber splicing assembly and a shell. Ports of the inner steel tube and the outer steel tube of the upper-end steel tube optical fiber are sealed in the upper-end isolation sealing assembly, the lower-end steel tube optical fiber penetrates through the lower-end isolation sealing assembly, and ports of the inner steel tube and the outer steel tube of the lower-end steel tube optical fiber are sealed in the lower-end isolation sealing assembly; the optical fiber splicing assembly is connected between the upper end isolation sealing assembly and the lower end isolation sealing assembly, bare optical fibers of the upper end steel tube optical fiber and the lower end steel tube optical fiber are connected in the optical fiber splicing assembly, and the outer shell is arranged outside the upper end isolation sealing assembly, the lower end isolation sealing assembly and the optical fiber splicing assembly in a sealing and sleeving mode. The device has the advantages that high-pressure gas cannot leak to the ground through the interior of the steel pipe, and monitoring safety of the under-pressure steel pipe optical cable is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of oil well logging, and in particular to a ground safety isolation and sealing device for optical cables. Background Technology

[0002] With the development of fiber optic monitoring technology, fiber optic monitoring technology for high-pressure gas well steel pipes has also been widely applied. However, during high-pressure gas well steel pipe fiber optic monitoring, issues frequently arise such as inadequate sealing of the fiber optic cable end at the bottom of the well or damage to the steel pipe inside the well, leading to pressurization inside the fiber optic cable exiting the wellhead. This poses a significant risk of gas leaking from the steel pipe to the surface.

[0003] Therefore, it is necessary to develop a new ground safety isolation and sealing device for optical cables to ensure that high-pressure gas does not leak to the ground through the inside of the steel pipe. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a ground safety isolation and sealing device for optical cables, which effectively overcomes the defects of the prior art.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0006] A ground-based safety isolation and sealing device for optical cables includes an upper steel tube optical fiber, a lower steel tube optical fiber, an upper isolation and sealing assembly, a lower isolation and sealing assembly, an optical fiber splicing component, and a housing. Both the upper and lower steel tube optical fibers include bare optical fibers and inner and outer steel tubes sequentially wrapped from the inside out. The upper steel tube optical fiber passes through the upper isolation and sealing assembly, with both the inner and outer steel tube ports sealed within it. Similarly, the lower steel tube optical fiber passes through the lower isolation and sealing assembly, with both the inner and outer steel tube ports sealed within it. The optical fiber splicing component connects the upper and lower isolation and sealing assemblies, and the bare optical fibers of both fibers are connected within the splicing component. The housing is sealed around the upper, lower, and optical fiber splicing assemblies.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, the aforementioned upper isolation sealing assembly includes an upper optical cable sealing and fixing component and an upper optical cable inner core sealing and connecting component that are interconnected at their ends. The outer steel tube seal of the upper steel tube optical fiber passes through the interior of the aforementioned upper optical cable sealing and fixing component. The outer steel tube port of the upper steel tube optical fiber is sealed and connected to the aforementioned upper optical cable inner core sealing and connecting component. The inner steel tube seal of the upper steel tube optical fiber passes through the interior of the aforementioned upper optical cable inner core sealing and connecting component, and the port of the inner steel tube of the upper steel tube optical fiber is sealed inside the aforementioned upper optical cable inner core sealing and connecting component.

[0009] Furthermore, the aforementioned lower end isolation sealing assembly includes a lower end optical cable sealing and fixing assembly and a lower end optical cable inner core sealing and connecting assembly that are interconnected at their ends. The outer steel tube of the lower end steel tube optical fiber passes through the lower end optical cable sealing and fixing assembly, and the port of the outer steel tube of the lower end steel tube optical fiber extends into the lower end optical cable inner core sealing and connecting assembly. The inner steel tube of the lower end steel tube optical fiber extends into the lower end optical cable inner core sealing and connecting assembly, and the port of the inner steel tube of the lower end steel tube optical fiber is sealed in the lower end optical cable inner core sealing and connecting assembly.

[0010] Furthermore, the aforementioned upper optical cable sealing and fixing assembly includes an upper conical sleeve, an upper clamp, an upper sealing joint, and a sealing adjustment screw. The upper sealing joint has internal threaded holes at both ends. One end of the upper conical sleeve has an external thread and is screwed into the internal threaded hole at one end of the upper sealing joint. The upper clamp is fitted into the conical cavity at one end of the upper conical sleeve. The sealing adjustment screw is threaded into the internal threaded hole at the other end of the upper sealing joint. A first sealing element is sandwiched between one end of the sealing adjustment screw and the internal threaded hole at the other end of the upper sealing joint. The outer steel tube of the upper steel tube optical fiber sequentially passes through the upper conical sleeve, the upper clamp, the upper sealing joint, and the sealing adjustment screw. The outer steel tube of the upper steel tube optical fiber engages with the upper clamp. The port of the outer steel tube of the upper steel tube optical fiber is connected to the upper optical cable inner core sealing connection assembly.

[0011] Furthermore, the aforementioned upper optical cable inner core sealing connection assembly includes a snap nut, a sealing cylinder, a locking snap connection nut, and a sealing glue bucket. The port of the outer steel tube of the upper steel tube optical fiber passes through the snap nut and is fixedly connected to each other. One end of the sealing cylinder has an external thread and extends into the mounting hole and is screwed into the snap nut. One end of the sealing cylinder contains an outer steel tube metal sealing component that is squeezed and sealed at the port of the outer steel tube of the upper steel tube optical fiber. The stud section of the locking snap connection nut is screwed into the internal threaded hole at one end of the sealing glue bucket. The other end of the locking snap connection nut has a threaded mounting hole. The other end of the sealing cylinder has a thread and is screwed into the threaded mounting hole at the other end of the locking snap connection nut. The other end of the sealing cylinder contains a first inner steel tube metal sealing component for squeezing and sealing at the port of the inner steel tube of the upper steel tube optical fiber. The bare optical fiber of the upper steel tube optical fiber passes through the sealing glue bucket, which is filled with sealant.

[0012] Furthermore, the aforementioned optical fiber splicing assembly includes a sleeve-shaped optical fiber skeleton, one end of which is provided with an external thread section, and the other end of the adhesive barrel is provided with a threaded hole adapted to the external thread section. One end of the optical fiber skeleton is screwed onto the other end of the adhesive barrel.

[0013] Furthermore, the aforementioned lower optical cable inner core sealing connection assembly includes a sleeve-shaped skeleton connector and a lower sealing joint. One end of the skeleton connector is sealed and extends into the other end of the optical fiber skeleton and can move relative to the optical fiber skeleton. They are locked together by locking elements. One end of the lower sealing joint is provided with an external thread, and the other end of the skeleton connector is provided with a screw hole. One end of the lower sealing joint is screwed onto the other end of the skeleton connector. The port of the outer steel tube of the lower steel tube optical fiber is sealed and extends into the interior of the other end of the lower sealing joint. A second inner steel tube metal sealing component for pressing and sealing at the port of the inner steel tube of the lower steel tube optical fiber is installed inside one end of the lower sealing joint. The other end of the lower sealing joint is connected to the aforementioned lower optical cable sealing and fixing assembly.

[0014] Furthermore, the locking component is a set screw threaded onto the side wall of the other end of the optical fiber frame. One end of the frame connector is provided with a plurality of set screw holes that are adapted to the set screw along its moving direction. The set screw is used to be screwed into any one of the set screw holes.

[0015] Furthermore, the aforementioned lower optical cable sealing and fixing assembly includes a lower clamp, a connector, a locking nut, and a lower conical sleeve. The lower conical sleeve passes through both ends of the connector. The lower clamp is installed in the conical hole at one end of the lower conical sleeve. The outer steel tube of the lower steel tube optical fiber passes through the lower clamp and engages with it. One end of the lower conical sleeve has an external thread. The other end of the lower sealing connector has an internal thread hole and is screwed onto the outside of one end of the lower conical sleeve. The other end of the lower conical sleeve has an external thread. The locking nut is screwed onto the other end of the lower conical sleeve and abuts against the other end of the connector. The two ends of the outer shell are respectively fitted onto the other end of the upper sealing connector and the outside of one end of the connector.

[0016] Furthermore, the other end of the upper sealing joint and the other end of the connector are respectively provided with limiting rings. The two ends of the outer shell abut against the two limiting rings respectively. The other end of the upper sealing joint and the other end of the connector are respectively provided with annular sealing rings. The sealing rings are in sealing contact with the inner wall of the outer shell.

[0017] The beneficial effects of this invention are: the structure is reasonably designed, which can block the internal pressure of the optical cable in the steel pipe inside the well during the detection of optical fiber in pressurized steel pipe, and safely isolate and seal the optical cable passing through the well and the optical cable on the ground, so that high pressure gas will not leak to the ground through the inside of the steel pipe, thus ensuring the safety of monitoring the optical cable in pressurized steel pipe. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the optical cable ground safety isolation and sealing device of the present invention;

[0019] Figure 2 This is a schematic diagram of the upper isolation and sealing assembly in the optical cable ground safety isolation and sealing device of the present invention;

[0020] Figure 3 This is a schematic diagram of the lower isolation and sealing assembly in the optical cable ground safety isolation and sealing device of the present invention;

[0021] Figure 4 This is a cross-sectional view of the upper or lower steel tube optical fiber in the optical cable ground safety isolation and sealing device of the present invention;

[0022] Figure 5 This is a partial structural diagram of the upper optical cable inner core sealing connection assembly in the optical cable ground safety isolation and sealing device of the present invention.

[0023] The attached diagram lists the components represented by each number as follows:

[0024] 1. Upper conical sleeve; 2. Upper clamp; 3. Upper sealing connector; 4. Sealing adjustment screw; 5. Outer shell; 6. Clip nut; 7. Sealing cylinder; 8. Locking clip connecting nut; 9. Adhesive barrel; 10. Fiber optic frame; 11. Frame connector; 12. Lower sealing connector; 13. Lower clamp; 14. Connector; 15. Locking nut; 16. Lower conical sleeve; 18. Outer steel tube; 19. Inner steel tube; 20. Bare fiber; 21. Outer steel tube metal sealing assembly; 22. First inner steel tube metal sealing assembly. Detailed Implementation

[0025] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0026] Example: Figure 1 , 2 As shown in Figures 3, 4, and 5, the optical cable ground safety isolation and sealing device of this embodiment includes an upper steel tube optical fiber, a lower steel tube optical fiber, an upper isolation and sealing assembly, a lower isolation and sealing assembly, an optical fiber splicing component, and a housing 5. Both the upper and lower steel tube optical fibers include a bare optical fiber 20 and an inner steel tube 19 and an outer steel tube 18 sequentially wrapped from the inside out. The upper steel tube optical fiber passes through the upper isolation and sealing assembly, and the ports of the inner steel tube 19 and outer steel tube 18 of the upper steel tube optical fiber are located within the upper isolation and sealing assembly. The lower steel tube optical fiber passes through the lower isolation and sealing assembly, and the ports of the inner steel tube 19 and outer steel tube 18 of the lower steel tube optical fiber are sealed in the lower isolation and sealing assembly. The optical fiber splicing assembly is connected between the upper isolation and sealing assembly and the lower isolation and sealing assembly. The bare optical fibers 20 of the upper steel tube optical fiber and the lower steel tube optical fiber are connected in the optical fiber splicing assembly. The outer shell 5 is sealed and fitted outside the upper isolation and sealing assembly, the lower isolation and sealing assembly and the optical fiber splicing assembly.

[0027] In this embodiment, the optical cable ground safety isolation and sealing device is installed by first passing the upper steel pipe optical fiber through the upper isolation and sealing assembly and assembling it with the upper isolation and sealing assembly, starting with the upper optical cable inside the well. Then, the lower steel pipe optical fiber, which is then connected to the lower isolation and sealing assembly, is passed through and sealed with the lower isolation and sealing assembly. After assembly, the bare optical fibers 20 of the upper and lower steel pipe optical fibers are connected within the optical fiber splicing assembly. Finally, the outer shell 5, which covers the upper isolation and sealing assembly, the lower isolation and sealing assembly, and the optical fiber splicing assembly, is installed. The entire structure can block the internal pressure of the optical cable inside the well during the detection of pressurized steel pipe optical fiber, achieving a safe isolation and sealing between the optical cable passing through the well and the ground optical cable, preventing high-pressure gas from leaking to the ground through the inside of the steel pipe, and ensuring the safety of pressurized steel pipe optical cable monitoring.

[0028] In a preferred embodiment, the aforementioned upper isolation sealing assembly includes an upper optical cable sealing and fixing assembly and an upper optical cable inner core sealing and connecting assembly connected at their ends. The outer steel tube 18 of the upper steel tube optical fiber passes through the interior of the upper optical cable sealing and fixing assembly. The port of the outer steel tube 18 of the upper steel tube optical fiber is sealed and connected to the upper optical cable inner core sealing and connecting assembly. The inner steel tube 19 of the upper steel tube optical fiber passes through the interior of the upper optical cable inner core sealing and connecting assembly, and the port of the inner steel tube 19 of the upper steel tube optical fiber is sealed inside the upper optical cable inner core sealing and connecting assembly.

[0029] In the above implementation scheme, during installation, the outer steel tube 18 passes through the upper optical cable sealing and fixing assembly, and the two are sealed together. After the outer steel tube 18 passes through the upper optical cable sealing and fixing assembly, it is cut off, and the cut end is sealed and connected with the upper optical cable inner core sealing connection assembly. Then, the inner steel tube 19 continues to pass through the upper optical cable inner core sealing connection assembly, and the inner steel tube 19 is also cut off. The cut end is sealed inside the upper optical cable inner core sealing connection assembly. After assembly, only the bare optical fiber 20 of the upper steel tube optical fiber is left to protrude. The two bare optical fibers 20 are spliced ​​in the optical fiber splicing assembly, and the sealing performance is very good.

[0030] Similarly, the aforementioned lower end isolation sealing assembly includes a lower end optical cable sealing and fixing assembly and a lower end optical cable inner core sealing and connecting assembly that are interconnected at their ends. The outer steel tube 18 of the lower end steel tube optical fiber passes through the lower end optical cable sealing and fixing assembly, and the port of the outer steel tube 18 of the lower end steel tube optical fiber extends into the lower end optical cable inner core sealing and connecting assembly. The inner steel tube 19 of the lower end steel tube optical fiber extends into the lower end optical cable inner core sealing and connecting assembly, and the port of the inner steel tube 19 of the lower end steel tube optical fiber is sealed in the lower end optical cable inner core sealing and connecting assembly. During installation, the outer steel tube 18 passes through the lower optical cable sealing and fixing assembly and is then cut off, and then sealed and extended into the lower optical cable inner core sealing connection assembly. The inner steel tube 19 is also cut off after extending into the lower optical cable inner core sealing connection assembly. The cut end is sealed in the lower optical cable inner core sealing connection assembly, leaving only the bare optical fiber 20 protruding. The two bare optical fibers 20 are then spliced ​​together in the optical fiber splicing assembly. The sealing of the lower steel tube optical fiber is also good. Combined with the steel tube optical fibers at both ends, it ensures that high-pressure gas will not leak from the ground.

[0031] In a preferred embodiment, the upper optical cable sealing and fixing assembly includes an upper conical sleeve 1, an upper clamp 2, an upper sealing connector 3, and a sealing adjustment screw 4. The upper sealing connector 3 has internal threaded holes at both ends. One end of the upper conical sleeve 1 has an external thread and is screwed into the internal threaded hole at one end of the upper sealing connector 3. The upper clamp 2 is fitted into the conical cavity at one end of the upper conical sleeve 1. The sealing adjustment screw 4 is threaded into the internal threaded hole at the other end of the upper sealing connector 3. A first sealing element is sandwiched between one end of the sealing adjustment screw 4 and the internal threaded hole at the other end of the upper sealing connector 3. The outer steel tube 18 of the upper steel tube optical fiber sequentially passes through the upper conical sleeve 1, the upper clamp 2, the upper sealing connector 3, and the sealing adjustment screw 4. The outer steel tube 18 of the upper steel tube optical fiber engages with the upper clamp 2. The port of the outer steel tube 18 of the upper steel tube optical fiber is connected to the upper optical cable inner core sealing connection assembly.

[0032] In the above implementation scheme, the outer steel tube 18 of the upper steel tube optical fiber passes through the upper clamp 2 and engages with the upper clamp 2 to fix its position. The outer steel tube 18 is cut off after passing through the upper sealing joint 3. During the assembly process of this structure, the first sealing element is squeezed by tightening the sealing adjustment screw 4. The first sealing element effectively seals the annular space between the outer steel tube 18 and the other end of the upper sealing joint 3. The upper conical sleeve 1, the upper sealing joint 3 and the sealing adjustment screw 4 are connected and assembled by threads, which is relatively convenient and the sealing is better after connection.

[0033] In this embodiment, the first sealing element is a plurality of stacked rubber sealing rings or sealing extrusion gaskets.

[0034] In a preferred embodiment, the aforementioned upper optical cable inner core sealing connection assembly includes a snap nut 6, a sealing cylinder 7, a locking snap connection nut 8, and a glue-fixing barrel 9. The port of the outer steel tube 18 of the upper steel tube optical fiber passes through the snap nut 6 and is fixedly connected to it. One end of the sealing cylinder 7 has an external thread and extends into the mounting hole and is screwed into the snap nut 6. One end of the sealing cylinder 7 contains an outer steel tube metal sealing assembly 21 that is squeezed and sealed at the port of the outer steel tube 18 of the upper steel tube optical fiber. The stud section of the connecting nut 8 is screwed into the internal threaded hole at one end of the aforementioned adhesive barrel 9. The other end of the aforementioned locking buckle connecting nut 8 is provided with a threaded mounting hole. The other end of the aforementioned sealing cylinder 7 is provided with threads and is screwed into the threaded mounting hole at the other end of the aforementioned locking buckle connecting nut 8. The other end of the aforementioned sealing cylinder 7 is equipped with a first inner steel tube metal sealing assembly 22 for extruding and sealing at the port of the inner steel tube 19 of the aforementioned upper steel tube optical fiber. The bare optical fiber 20 of the aforementioned upper steel tube optical fiber passes through the aforementioned adhesive barrel 9, and the aforementioned adhesive barrel 9 is filled with sealant.

[0035] In the above implementation scheme, the cut end of the outer steel tube 18 of the upper steel tube optical fiber is sealed inside one end of the sealing cylinder 7 by the compression of the outer steel tube metal sealing assembly 21, and the cut end of the inner steel tube 19 is sealed inside the other end of the sealing cylinder 7 by the compression of the first inner steel tube metal sealing assembly 22. This ensures that only the bare optical fiber 20 of the upper steel tube optical fiber passes through, and the remaining outer steel tube 18 and inner steel tube 19 can be well assembled and sealed in the upper isolation sealing assembly.

[0036] The snap-fit ​​nuts 6 and the sealing adjustment screws 4 are spaced apart. The snap-fit ​​nuts 6 are fixedly fitted onto the outer steel tube 18 of the upper steel tube optical fiber.

[0037] In this embodiment, the aforementioned optical fiber splicing assembly includes a sleeve-shaped optical fiber frame 10. One end of the optical fiber frame 10 is provided with an external thread section, and the other end of the adhesive container 9 is provided with a threaded hole adapted to the external thread section. One end of the optical fiber frame 10 is screwed onto the other end of the adhesive container 9. The threaded engagement between the optical fiber frame 10 and the other end of the adhesive container 9 makes assembly convenient and provides good sealing.

[0038] In a preferred embodiment, the lower optical cable inner core sealing connection assembly includes a sleeve-shaped skeleton connector 11 and a lower sealing connector 12. One end of the skeleton connector 11 is sealed and extends into the other end of the optical fiber skeleton 10 and can move relative to the optical fiber skeleton 10. They are locked together by locking members. One end of the lower sealing connector 12 is provided with an external thread, and the other end of the skeleton connector 11 is provided with a screw hole. One end of the lower sealing connector 12 is screwed onto the other end of the skeleton connector 11. The port of the outer steel tube 18 of the lower steel tube optical fiber is sealed and extends into the interior of the other end of the lower sealing connector 12. A second inner steel tube metal sealing assembly for pressing and sealing at the port of the inner steel tube 19 of the lower steel tube optical fiber is installed inside one end of the lower sealing connector 12. The other end of the lower sealing connector 12 is connected to the lower optical cable sealing and fixing assembly.

[0039] In the above implementation scheme, the outer steel tube 18 of the lower steel tube optical fiber is cut off after passing through the lower optical cable sealing and fixing assembly, and the cut end extends into the other end of the lower sealing joint 12 and makes sealing contact. The inner steel tube 19 is cut off after extending a certain length, and the cut end extends into the skeleton connector 11. It is sealed by the compression of the second inner steel tube metal sealing assembly, ensuring that both the outer steel tube 18 and the inner steel tube 19 of the lower steel tube optical fiber can be well sealed in the lower isolation sealing assembly, leaving only the bare optical fiber 20 protruding. At the same time, the skeleton connector 11 and the lower sealing joint 12 adopt a threaded connection method, which is convenient for assembly and has good sealing performance.

[0040] In this embodiment, the locking element is a set screw threaded onto the side wall of the other end of the optical fiber frame 10. One end of the frame connector 11 has multiple set screw holes spaced apart along its moving direction, each adapted to the set screw. The set screw is screwed into any one of these set screw holes. After the bare optical fiber 20 of the lower steel tube optical fiber passes through, the frame connector 11 is moved relative to the optical fiber frame 10 to adjust its size and position, and then fixed in place by the locking element.

[0041] In a preferred embodiment, the lower optical cable sealing and fixing assembly includes a lower clamp 13, a connector 14, a locking nut 15, and a lower conical sleeve 16. The lower conical sleeve 16 passes through both ends of the connector 14. The lower clamp 13 is installed in the conical hole at one end of the lower conical sleeve 16. The outer steel tube 18 of the lower steel tube optical fiber passes through the lower clamp 13 and engages with it. One end of the lower conical sleeve 16 has an external thread. The other end of the lower sealing connector 12 has an internal thread hole and is screwed onto the outside of one end of the lower conical sleeve 16. The other end of the lower conical sleeve 16 has an external thread. The locking nut 15 is screwed onto the other end of the lower conical sleeve 16 and abuts against the other end of the connector 14. The two ends of the outer shell 5 are respectively fitted onto the other end of the upper sealing connector 3 and the outside of one end of the connector 14.

[0042] In the above implementation scheme, the outer steel tube 18 of the lower steel tube optical fiber passes through the lower clamp 13 and is engaged and fixed with the lower clamp 13. The connector 14 and the other end of the lower sealing joint 12 are installed by spiral engagement, which has good sealing performance. At the same time, the connector 14 can be positioned by locking the other end of the connector 14 with the locking nut 15. The structural design of the entire lower optical cable sealing and fixing assembly is relatively compact and the assembly is relatively quick and convenient.

[0043] In this embodiment, limiting rings are respectively provided on the outer side of the other end of the upper sealing joint 3 and one end of the connector 14. The two ends of the outer shell 5 abut against the two limiting rings respectively. Annular sealing rings are respectively embedded on the surface of the other end of the upper sealing joint 3 and one end of the connector 14, and the sealing rings are in sealing contact with the inner wall of the outer shell 5. The outer shell 5 is a pipe fitting, and its two ends abut against the limiting rings of the upper sealing joint 3 and the connector 14 respectively, allowing it to be installed in place. During installation, the inner walls of both ends of the outer shell 5 are sealed by the sealing rings, resulting in good sealing performance.

[0044] It should be noted that in this embodiment, the upper conical sleeve 1, upper clip 2, upper sealing connector 3, sealing adjustment screw 4, outer shell 5, clip nut 6, sealing cylinder 7, locking clip connecting nut 8, adhesive barrel 9, optical fiber frame 10, frame connector 11, lower sealing connector 12, and lower clip 13 are respectively provided with channels for the steel pipe optical fiber to pass through.

[0045] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0049] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0050] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A ground-based safety isolation and sealing device for optical cables, characterized in that: The system includes an upper steel tube optical fiber, a lower steel tube optical fiber, an upper isolation and sealing assembly, a lower isolation and sealing assembly, an optical fiber splicing component, and a housing (5). Both the upper and lower steel tube optical fibers include a bare optical fiber (20) and an inner steel tube (19) and an outer steel tube (18) sequentially wrapped from the inside out. The upper steel tube optical fiber passes through the upper isolation and sealing assembly, and the ports of both the inner steel tube (19) and the outer steel tube (18) of the upper steel tube optical fiber are sealed within the upper isolation and sealing assembly. The lower steel tube... The optical fiber passes through the lower isolation and sealing assembly, and the ports of the inner steel tube (19) and outer steel tube (18) of the lower steel tube optical fiber are sealed in the lower isolation and sealing assembly. The optical fiber splicing assembly is connected between the upper isolation and sealing assembly and the lower isolation and sealing assembly. The bare optical fibers (20) of the upper steel tube optical fiber and the lower steel tube optical fiber are connected in the optical fiber splicing assembly. The outer shell (5) is sealed and fitted outside the upper isolation and sealing assembly, the lower isolation and sealing assembly and the optical fiber splicing assembly.

2. The optical cable ground safety isolation and sealing device according to claim 1, characterized in that: The upper isolation and sealing assembly includes an upper optical cable sealing and fixing assembly and an upper optical cable inner core sealing and connecting assembly connected to each other at their ends. The outer steel tube (18) of the upper steel tube optical fiber passes through the interior of the upper optical cable sealing and fixing assembly. The port of the outer steel tube (18) of the upper steel tube optical fiber is sealed and connected to the upper optical cable inner core sealing and connecting assembly. The inner steel tube (19) of the upper steel tube optical fiber passes through the interior of the upper optical cable inner core sealing and connecting assembly, and the port of the inner steel tube (19) of the upper steel tube optical fiber is sealed inside the upper optical cable inner core sealing and connecting assembly.

3. The optical cable ground safety isolation and sealing device according to claim 2, characterized in that: The lower end isolation and sealing assembly includes a lower end optical cable sealing and fixing assembly and a lower end optical cable inner core sealing and connecting assembly connected to each other at the ends. The outer steel tube (18) of the lower end steel tube optical fiber passes through the lower end optical cable sealing and fixing assembly, and the port of the outer steel tube (18) of the lower end steel tube optical fiber extends into the lower end optical cable inner core sealing and connecting assembly. The inner steel tube (19) of the lower end steel tube optical fiber extends into the lower end optical cable inner core sealing and connecting assembly, and the port of the inner steel tube (19) of the lower end steel tube optical fiber is sealed in the lower end optical cable inner core sealing and connecting assembly.

4. The optical cable ground safety isolation and sealing device according to claim 3, characterized in that: The upper optical cable sealing and fixing assembly includes an upper conical sleeve (1), an upper clamp (2), an upper sealing connector (3), and a sealing adjustment screw (4). The upper sealing connector (3) has internal threaded holes at both ends. One end of the upper conical sleeve (1) has an external thread and is screwed into the internal threaded hole at one end of the upper sealing connector (3). The upper clamp (2) is fitted into the conical cavity at one end of the upper conical sleeve (1). The sealing adjustment screw (4) is screwed into the internal thread at the other end of the upper sealing connector (3). In the hole, a first sealing element is sandwiched between one end of the sealing adjustment screw (4) and the inner thread hole of the other end of the upper sealing connector (3). The outer steel tube (18) of the upper steel tube optical fiber passes through the upper tapered sleeve (1), the upper clip (2), the upper sealing connector (3) and the sealing adjustment screw (4) in sequence. The outer steel tube (18) of the upper steel tube optical fiber is engaged with the upper clip (2). The port of the outer steel tube (18) of the upper steel tube optical fiber is connected to the sealing connection assembly of the upper optical cable inner core.

5. The optical cable ground safety isolation and sealing device according to claim 4, characterized in that: The upper optical cable inner core sealing connection assembly includes a snap nut (6), a sealing cylinder (7), a locking snap connection nut (8), and a glue barrel (9). The port of the outer steel tube (18) of the upper steel tube optical fiber passes through the snap nut (6) and is fixedly connected to each other. One end of the sealing cylinder (7) has an external thread and extends into the mounting hole and is screwed into the snap nut (6). One end of the sealing cylinder (7) is equipped with an outer steel tube metal sealing assembly (21) that is squeezed and sealed at the port of the outer steel tube (18) of the upper steel tube optical fiber. The locking snap connection nut (8) The stud section is screwed into the internal threaded hole at one end of the adhesive barrel (9). The other end of the locking buckle connecting nut (8) is provided with a threaded mounting hole. The other end of the sealing cylinder (7) is provided with a thread and is screwed into the threaded mounting hole at the other end of the locking buckle connecting nut (8). The other end of the sealing cylinder (7) is equipped with a first inner steel tube metal sealing assembly (22) for extruding and sealing at the port of the inner steel tube (19) of the upper steel tube optical fiber. The bare optical fiber (20) of the upper steel tube optical fiber passes through the adhesive barrel (9). The adhesive barrel (9) is filled with sealant.

6. The optical cable ground safety isolation and sealing device according to claim 5, characterized in that: The optical fiber splicing assembly includes a sleeve-shaped optical fiber skeleton (10), one end of which is provided with an external thread section, and the other end of the adhesive barrel (9) is provided with a threaded hole adapted to the external thread section. One end of the optical fiber skeleton (10) is screwed onto the other end of the adhesive barrel (9).

7. The optical cable ground safety isolation and sealing device according to claim 6, characterized in that: The lower end optical cable inner core sealing connection assembly includes a sleeve-shaped skeleton connector (11) and a lower sealing connector (12). One end of the skeleton connector (11) is sealed and extends into the other end of the optical fiber skeleton (10) and can move relative to the optical fiber skeleton (10). They are locked together by locking elements. One end of the lower sealing connector (12) is provided with an external thread, and the other end of the skeleton connector (11) is provided with a screw hole. One end of the lower sealing connector (12) is screwed onto the other end of the skeleton connector (11). The port of the outer steel tube (18) of the lower end steel tube optical fiber is sealed and extends into the other end of the lower sealing connector (12). The lower sealing connector (12) is equipped with a second inner steel tube metal sealing assembly for pressing and sealing the port of the inner steel tube (19) of the lower end steel tube optical fiber. The other end of the lower sealing connector (12) is connected to the lower end optical cable sealing and fixing assembly.

8. The optical cable ground safety isolation and sealing device according to claim 7, characterized in that: The locking component is a set screw threaded onto the side wall of the other end of the optical fiber frame (10). One end of the frame connector (11) is provided with a plurality of set screw holes that are adapted to the set screw along its moving direction. The set screw is used to be screwed into any one of the set screw holes.

9. The optical cable ground safety isolation and sealing device according to claim 7, characterized in that: The lower end optical cable sealing and fixing assembly includes a lower clamp (13), a connector (14), a locking nut (15), and a lower conical sleeve (16). The lower conical sleeve (16) passes through both ends of the connector (14). The lower clamp (13) is installed in the conical hole at one end of the lower conical sleeve (16). The outer steel tube (18) of the lower end steel tube optical fiber passes through the lower clamp (13) and engages with it. One end of the lower conical sleeve (16) has an external thread. The other end of the lower sealing connector (12) has an internal thread hole and is screwed onto the outside of one end of the lower conical sleeve (16). The other end of the lower conical sleeve (16) has an external thread. The locking nut (15) is screwed onto the other end of the lower conical sleeve (16) and abuts against the other end of the connector (14). The two ends of the outer shell (5) are respectively fitted onto the other end of the upper sealing connector (3) and the outside of one end of the connector (14).

10. The optical cable ground safety isolation and sealing device according to claim 9, characterized in that: Limiting rings are provided on the outer side of the other end of the upper sealing joint (3) and the outer end of the connector (14). The two ends of the outer shell (5) abut against the two limiting rings respectively. The surface of the other end of the upper sealing joint (3) and the outer end of the connector (14) is respectively embedded with annular sealing rings. The sealing rings are in sealing contact with the inner wall of the outer shell (5).

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