Optical fiber end seal

Abstract

The application relates to a fiber end sealing device. The fiber end sealing device comprises a fiber composite insulator, a flange and a filling medium sealing piece. The fiber composite insulator is provided with a hollow through hole, the hollow through hole is filled with a filling medium, and an optical fiber passes through the hollow through hole. The flange is connected with the fiber composite insulator, and a flange sealing cover is arranged at the end of the hollow through hole. The flange is provided with a plurality of first through holes and second through holes, the first through holes and the second through holes are connected with the hollow through hole, and each first through hole only passes through one optical fiber from the hollow through hole. The filling medium sealing piece is connected with the hollow through hole through the second through hole, and the filling medium sealing piece is used for storing the filling medium overflowing in the hollow through hole or conveying the filling medium to fill the hollow through hole. The fiber end sealing device has the advantages of good stability and high safety.

Description

Technical Field

[0001] This application relates to the field of high-voltage equipment sealing technology, and in particular to an optical fiber end sealing device. Background Technology

[0002] Fiber optic composite insulators primarily provide mechanical support and insulation protection for optical current transformers, and their end sealing performance directly affects the operational reliability of the optical current transformers. The end sealing of fiber optic composite insulators mainly involves two aspects: sealing the fiber optic port and sealing the insulating medium filling port.

[0003] Currently, when threading fibers inside fiber-optic composite insulators, a group of fibers typically exits through the same channel. Sealing this channel can easily lead to tiny air bubbles or gaps between the fibers, creating a risk of partial discharge. Furthermore, this method of threading fibers also makes them prone to entanglement, causing damage or even breakage. On the other hand, the treatment of the insulating medium filling opening mainly employs two forms: open structure and sealed structure. In an open structure, the filling medium overflows from the fiber-optic composite insulator due to its own thermal expansion, leaving air bubbles and cavities inside, which can easily trigger partial discharge or even fiber ablation, ultimately leading to interruption of fiber optic signal transmission. In a sealed structure, the internal stress of the filling medium changes with ambient temperature and acts on the fiber, significantly affecting the stability and accuracy of optical signal transmission, resulting in insufficient current measurement accuracy. Therefore, existing end-sealing structures can no longer meet the actual application requirements of fiber-optic composite insulators. Summary of the Invention

[0004] Therefore, it is necessary to provide an optical fiber end sealing device to address the problem of poor sealing effect at the ends of optical fiber composite insulators, which leads to damage and ablation of optical fibers.

[0005] An optical fiber end sealing device, comprising:

[0006] An optical fiber composite insulator is provided with a hollow through hole, which is filled with a filling medium, and an optical fiber passes through the hollow through hole.

[0007] A flange is connected to the optical fiber composite insulator, and the flange is sealed at the end of the hollow through hole. The flange has a first through hole and a second through hole, both of which are connected to the hollow through hole. There are multiple first through holes, and each first through hole passes through only one optical fiber.

[0008] A filling medium seal is provided, which is connected to the hollow through hole through the second through hole. The filling medium seal is used to store the filling medium overflowing from the hollow through hole, or to deliver the filling medium to fill the hollow through hole.

[0009] In one embodiment, the filling medium seal is divided into a glue storage chamber and a compression chamber by a piston. The compression chamber is provided with a compression member, which is connected to the piston. The glue storage chamber is connected to the hollow through hole through the second through hole.

[0010] In one embodiment, the filling medium seal further includes a connecting pipe connected to the glue storage cavity. The outer wall of the connecting pipe is provided with a first external thread, and the wall of the second through hole is provided with a first internal thread. The connecting pipe and the first through hole are connected by the first external thread and the first internal thread, and a first sealant is provided between the first external thread and the first internal thread.

[0011] In one embodiment, the extrusion member is a compression spring, with its two ends abutting against the end face of the extrusion chamber and the piston, respectively.

[0012] In one embodiment, the end face of the extrusion chamber is provided with an exhaust port.

[0013] In one embodiment, the optical fiber end sealing device further includes an optical fiber seal, which is installed in the first through hole. The two ends of the optical fiber seal are respectively provided with an inlet hole and an outlet hole. The inlet hole and the outlet hole are connected and are both connected to the hollow through hole. The optical fiber passes through the channel connected by the inlet hole and the outlet hole.

[0014] In one embodiment, the channel between the fiber inlet and the fiber outlet is filled with a second sealant.

[0015] In one embodiment, the outer surface of the optical fiber seal is provided with a second external thread, the first through hole is provided with a second internal thread, the optical fiber seal and the second through hole are connected by the second external thread and the second internal thread, and a third sealant is provided between the second external thread and the second internal thread.

[0016] In one embodiment, the flange is further provided with a plurality of connection holes through which fasteners pass and are fastened to the optical fiber composite insulator.

[0017] In one embodiment, the flange is further provided with a sealing groove, which is disposed on the contact surface between the flange and the optical fiber composite insulator and is closed around the position of the hollow through hole;

[0018] A sealing ring is provided inside the sealing groove.

[0019] The aforementioned fiber optic end sealing device improves fiber tension and entanglement by providing multiple first through holes on the flange, allowing only one fiber to pass through each hole. Furthermore, by connecting a filling medium seal to the hollow through hole, it stores the filling medium when it overflows and returns it when it is insufficient. This flexible sealing method effectively addresses the thermal expansion problem of the filling medium, preventing the fiber from being subjected to compressive stress and partial discharge ablation. This application effectively ensures safer and more stable optical signal transmission within the fiber optic composite insulator, offering advantages of high stability and safety. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the optical fiber end sealing device described in an embodiment of this application.

[0021] Figure 2 This is a schematic diagram of the flange component of the optical fiber end sealing device described in the embodiments of this application.

[0022] Figure 3 This is a cross-sectional view of the flange of the optical fiber end sealing device described in an embodiment of this application.

[0023] Figure 4 This is a schematic diagram of the filling medium seal of the optical fiber end sealing device described in the embodiments of this application.

[0024] Figure 5 This is a schematic diagram of the structure of the fiber optic seal of the fiber optic end sealing device described in the embodiments of this application.

[0025] Reference numerals: 10, Fiber optic cable;

[0026] 100, Fiber optic composite insulator; 100A, Hollow through hole; 110, Filled medium;

[0027] 200, Flange; 210, First through hole; 211, Second internal thread; 220, Second through hole; 221, First internal thread; 230, Connecting hole; 240, Sealing groove; 241, Sealing ring;

[0028] 300, Filling medium seal; 300A, Glue storage chamber; 300B, Extrusion chamber; 310, Piston; 320, Extrusion component; 330, Connecting pipe; 331, First external thread;

[0029] 400, Fiber optic seal; 410, Fiber inlet hole; 420, Fiber outlet hole; 430, Second external thread. Detailed Implementation

[0030] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0031] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0032] Furthermore, where the terms "first" and "second" appear, these terms are 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 with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," 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 expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" 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. Similarly, "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.

[0035] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0036] See Figure 1 and Figure 2 , Figure 1 A schematic diagram of the optical fiber end sealing device according to an embodiment of this application is shown. Figure 2 A schematic diagram of the flange of an optical fiber end sealing device according to an embodiment of this application is shown. The optical fiber end sealing device provided in this embodiment includes an optical fiber composite insulator 100, a flange 200, and a filling medium sealing element 300. The optical fiber composite insulator 100 has a hollow through-hole 100A, which is filled with a filling medium 110, through which an optical fiber passes. The flange 200 is connected to the optical fiber composite insulator 100 and seals the end of the hollow through-hole 100A. The flange 200 has a first through-hole 210 and a second through-hole 220, both of which are connected to the hollow through-hole 100A. There are multiple first through-holes 210, and each first through-hole 210 allows only one optical fiber to pass through the hollow through-hole 100A. The filling medium seal 300 is connected to the hollow through-hole 100A through the second through-hole 220. The filling medium seal 300 is used to store the filling medium 110 overflowing from the hollow through-hole 100A, or to transport the filling medium 110 to fill the hollow through-hole 100A. Preferably, the second through-hole 220 is located at the center of the end face of the flange 200, and the first through-holes 210 are evenly distributed around the second through-hole 220.

[0037] It should be noted that the filling medium 110 is an optical fiber filling paste, which has a certain degree of fluidity. In some other embodiments, the filling medium 100 may also be a flexible polymer filling material such as polyisobutylene.

[0038] The optical fiber end sealing device described in this application embodiment connects the filling medium seal 300 to the hollow through-hole 100A, allowing the filling medium 110 to circulate between the optical fiber composite insulator 100 and the filling medium seal 300 during temperature changes. This reduces the internal pressure of the filling medium 110, thereby releasing the compressive stress on the optical fiber 10. This flexible sealing method effectively addresses the thermal expansion problem of the filling medium, preventing the optical fiber from being subjected to compressive stress and partial discharge ablation. Furthermore, by providing multiple first through-holes 210 on the flange 200, each first through-hole 210 allows only one optical fiber 10 to pass through, improving the situation of optical fiber pulling and entanglement. It also avoids the problem of air bubbles or gaps easily forming between the optical fiber 10 and the sealant when multiple optical fibers 10 are sealed in the same channel, minimizing the probability of partial discharge near the optical fiber 10.

[0039] The optical fiber end sealing device described in this application embodiment uses multiple first through holes 210 to achieve independent arrangement and sealing of multiple optical fibers 10. Through the thermal expansion effect of the filling medium sealing element 300 and the filling medium 110, partial discharge caused by the cavity after the filling medium 110 overflows is avoided, the compressive stress of the filling medium 110 on the optical fiber 10 is relieved, and the optical signal transmission of the optical fiber 10 is effectively guaranteed to be safe and stable. It has the advantages of good stability and high safety.

[0040] In this embodiment, the number of first through holes 210 is set to 7, which is consistent with the number of optical fibers 10 inside the optical fiber composite insulator 100. This ensures that each optical fiber 10 can be threaded individually, which is beneficial for achieving a full seal of the optical fiber 10 and avoiding air bubbles and gaps around the optical fiber 10. In other embodiments, the number of first through holes 210 can be set according to the actual number of optical fibers 10 used to ensure that each optical fiber 10 is evenly arranged and fully sealed.

[0041] Combination Figure 4 As shown, Figure 4This diagram illustrates the structure of the filling medium seal of an optical fiber end sealing device according to one embodiment of this application. In some embodiments, the filling medium seal 300 is divided into a storage chamber 300A and a compression chamber 300B by a piston 310. A compression member 320 is provided in the compression chamber 300B and is connected to the piston 310. The storage chamber 300A is connected to the hollow through-hole 100A through a second through-hole 220. Specifically, when the filling medium 110 overflows from the hollow through-hole 110A due to thermal expansion, it enters the storage chamber 300A through the second through-hole 220. This causes the piston 310 to compress the space of the compression chamber 300B under the push of the filling medium 110, and the compression member 320 is pushed and compressed by the piston 310 until it reaches an equilibrium state. Similarly, when the volume of the filling medium 110 shrinks, the compressed extruder 320 can push the piston 310 to compress the space of the glue storage cavity 300A, causing the filling medium 110 in the glue storage cavity 300A to be squeezed back into the hollow through hole 110A until an equilibrium state is reached again. In this embodiment, the filling medium sealing member 300 has a buffering effect on the thermal expansion effect of the filling medium 100, which not only avoids the generation of air bubbles or cavities inside the filling medium 110, but also relieves the internal stress of the filling medium 110, effectively ensuring the reliability of optical fiber transmission.

[0042] In an optional embodiment, such as Figure 4 As shown, the filling medium seal 300 also includes a connecting pipe 330, which is connected to the glue storage cavity 300A. The outer wall of the connecting pipe 330 is provided with a first external thread 331, and the wall of the second through hole 220 is provided with a first internal thread 221. The connecting pipe 330 and the first through hole 210 are connected by the first external thread 331 and the first internal thread 221, and a first sealant is provided between the first external thread 331 and the first internal thread 221. By providing a connecting pipe 330 to connect the second through hole 220 in the filling medium seal 300, and providing a first external thread 331 on the outer surface of the connecting pipe 330 and a first internal thread 221 in the second through hole 220, the first external thread 331 and the first internal thread 221 are fitted together for installation, ensuring a stable connection between the filling medium seal 300 and the flange 200. Furthermore, a first sealant, which is an epoxy resin adhesive, is provided between the first external thread 331 and the first internal thread 221 to further improve the sealing performance of the connection between the filling medium sealant 300 and the flange 200. In some other embodiments, the first sealant may also be made of other materials, such as silicone rubber, polyurethane adhesive, etc.

[0043] In one embodiment, the inner diameter of the connecting pipe 330 is 6 mm, and the inner diameter of the glue storage cavity 300A is 20 mm. It is understood that the connecting pipe 330 serves as a flow channel for the filling medium 110, and the glue storage cavity 300A serves as a container for the filling medium 110. The inner diameter of the connecting pipe 330 needs to be determined based on the inner diameter of the glue storage cavity 300A to ensure the flowability of the filling medium 110 within the filling medium seal 300. In this embodiment, based on the positional relationship of the filling medium seal 300, the inner diameters of the connecting pipe 330 and the glue storage cavity 300A are set to 6 mm and 20 mm respectively, which allows the filling medium seal 300 to effectively match the thermal expansion effect of the filling medium 110. In some other embodiments, the inner diameters of the connecting pipe 330 and the glue storage cavity 300A can be set according to actual usage requirements.

[0044] In an optional embodiment, the extruder 320 is a compression spring, with its two ends abutting against the end face of the extrusion chamber 300B and the piston 310, respectively. By setting the extruder 320 as a compression spring, when the filling medium 110 flows into the storage chamber 300A, the filling medium 110 compresses the piston 310, causing the piston 310 to move and compress the compression spring. The compression spring also pushes the piston 310 to eliminate the gaps inside the filling medium 110, achieving an equilibrium state. When the volume of the filling medium 110 decreases, the compression spring also pushes the piston 310 to eliminate the gaps inside the filling medium 110. Using a compression spring as the extruder 320 has the advantages of simple structure and low cost.

[0045] In an optional embodiment, the end face of the extrusion chamber 300B is provided with an exhaust port. By providing an exhaust port on the end face of the extrusion chamber 300B, when the filling medium 110 flows into the storage chamber 300A, the piston 310 is pushed towards the bottom of the extrusion chamber 300B. If the end of the extrusion chamber 300B is configured as a sealed structure, the internal air pressure of the extrusion chamber 300B will continuously increase, hindering the movement of the piston 310 and causing the filling medium seal 300 to fail in its function of containing the filling medium 110. Therefore, an exhaust port is provided at the end of the extrusion chamber 300B to balance its internal and external air pressures, eliminate the obstruction effect of internal air pressure on the piston 310, ensure that the thermal expansion stress inside the filling medium 110 can be released in a timely manner, and avoid damage to the optical fiber 10 due to extrusion stress.

[0046] In an optional embodiment, such as Figure 1 and Figure 5As shown, the optical fiber end sealing device also includes an optical fiber seal 400, which is installed in the first through hole 210. The two ends of the optical fiber seal 400 are respectively provided with an inlet hole 410 and an outlet hole 420, which are connected. Both the inlet hole 410 and the outlet hole 420 are connected to the hollow through hole 100A. The optical fiber passes through the channel connecting the inlet hole 410 and the outlet hole 420. By setting the optical fiber seal 400 in the first through hole 210, with an inlet hole 410 at the lower end and an outlet hole 420 at the upper end, the optical fiber 10 can be led out through the optical fiber seal 400, ensuring that a single optical fiber 10 is fully sealed and preventing air bubbles and gaps between the optical fibers 10, thus guaranteeing its electrical insulation.

[0047] In an optional embodiment, the channel between the fiber inlet 410 and the fiber outlet 420 is filled with a second sealant. Specifically, the diameter of the fiber inlet 410 is 1 mm, and the diameter of the fiber outlet 420 is 3 mm. In this embodiment, after the optical fiber 10 passes through the fiber inlet 410 and exits through the fiber outlet 420, the second sealant is injected into the channel between the fiber inlet 410 and the fiber outlet 420. At this time, since the size of the fiber inlet 410 is close to that of the optical fiber 10, it can not only fix the optical fiber 10, but also ensure that the second sealant does not drip, thereby ensuring the sealing effect of the optical fiber 10. Specifically, the second sealant is a flexible sealant such as silicone rubber to seal the optical fiber 10, which can minimize the probability of stress damage to the optical fiber. In some other embodiments, the diameters of the fiber inlet 410 and the fiber outlet 420 can be set according to the diameter of the optical fiber 10 used and the performance of the second sealant.

[0048] In an optional embodiment, such as Figure 3 and Figure 5 As shown, the outer surface of the optical fiber seal 400 is provided with a second external thread 430, and the first through hole 210 is provided with a second internal thread 211. The optical fiber seal 400 and the second through hole 220 are connected by the second external thread 430 and the second internal thread 211, and a third sealant is provided between the second external thread 430 and the second internal thread 211. Specifically, by providing the second external thread 430 on the outer surface of the optical fiber seal 400, which cooperates with the second internal thread hole 211 in the second through hole 220, and using a composite sealing method assisted by the third sealant, the sealing performance of the optical fiber end sealing device for the optical fiber 10 can be effectively guaranteed. Specifically, the third sealant is epoxy resin. In some other embodiments, the third sealant can also be made of other materials, such as silicone rubber, polyurethane, etc.

[0049] In an optional embodiment, such as Figure 3As shown, the flange 200 also has multiple connection holes 230, through which fasteners pass to securely connect with the fiber optic composite insulator 100. By providing multiple connection holes 230 on the flange 200 and then using fasteners passing through the connection holes 230, a secure connection is formed between the flange 200 and the fiber optic composite insulator 100. Preferably, the fasteners are bolts.

[0050] In an optional embodiment, such as Figure 3 As shown, the flange 200 also has a sealing groove 240, which is located at the contact surface between the flange 200 and the fiber optic composite insulator 100 and is closed around the hollow through-hole 100A. A sealing ring 241 is provided within the sealing groove 240. Specifically, the sealing groove 240 is an annular groove for placing an O-ring, and the sealing ring 241 is an O-ring. The cooperation between the annular groove and the O-ring further enhances the sealing effect of the fiber optic end sealing device. When the flange 200 and the fiber optic composite insulator 100 are fixedly connected through the connecting hole 230, the sealing ring 240 undergoes elastic deformation under pressure, isolating the hollow through-hole 100A of the fiber optic composite insulator 100 from the outside air. This ensures that the filling medium 110 always flows within the sealed hollow through-hole 100A, thus preventing air bubbles or cavities from forming inside the filling medium 110. In this embodiment, the O-ring material used for the sealing ring 241 is nitrile rubber. It is understandable that O-rings can also be made of other materials that are compatible with the filling medium, such as EPDM rubber, fluororubber, and silicone rubber.

[0051] The optical fiber end sealing device described in this application has the following beneficial effects:

[0052] 1. Multiple first through holes 210 are used to realize the independent arrangement and sealing of multiple optical fibers 10. Through the thermal expansion effect of the filling medium seal 300 and the filling medium 110, partial discharge caused by the cavity after the filling medium 110 overflows is avoided, the compressive stress of the filling medium 110 on the optical fiber 10 is relieved, and the optical signal transmission of the optical fiber 10 is effectively guaranteed to be safe and stable. It has the advantages of good stability and high security.

[0053] 2. By setting an optical fiber seal 400 in the first through hole 210, with an inlet hole 410 at the lower end and an outlet hole 420 at the upper end, the optical fiber 10 can be led out through the optical fiber seal 400, which can fully seal the single optical fiber 10, avoid the generation of air bubbles and air gaps between the optical fibers 10, and ensure its electrical insulation.

[0054] 3. By providing a second external thread 430 on the outer surface of the optical fiber seal 400, which mates with the second internal thread hole 211 within the second through hole 220, and supplemented by a third sealant, a composite sealing method can effectively ensure the sealing performance of the optical fiber end sealing device on the optical fiber 10, thus guaranteeing the insulation performance of the end of the optical fiber composite insulator 100. Simultaneously, using flexible sealants such as silicone rubber to seal the optical fiber 10 can minimize the probability of stress damage to the optical fiber.

[0055] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An optical fiber end seal, comprising: include: An optical fiber composite insulator (100) is provided with a hollow through hole (100A), which is filled with a filling medium (110), and an optical fiber passes through the hollow through hole (100A). A flange (200) is connected to the optical fiber composite insulator (100), and the flange (200) is sealed to the end of the hollow through hole (100A). The flange (200) is provided with a first through hole (210) and a second through hole (220). Both the first through hole (210) and the second through hole (220) are connected to the hollow through hole (100A). There are multiple first through holes (210), and each first through hole (210) passes through only one optical fiber through the hollow through hole (100A). A filling medium seal (300) is connected to the hollow through hole (100A) through the second through hole (220). The filling medium seal (300) is used to store the filling medium (110) overflowing from the hollow through hole (100A) or to deliver the filling medium (110) to fill the hollow through hole (100A). The filling medium seal (300) is divided into a glue storage chamber (300A) and a compression chamber (300B) by a piston (310). The compression chamber (300B) is provided with a compression member (320), which is connected to the piston (310). The glue storage chamber (300A) is connected to the hollow through hole (100A) through the second through hole (220).

2. The optical fiber end sealing device according to claim 1, characterized in that: The filling medium seal (300) further includes a connecting pipe (330), which is connected to the glue storage cavity (300A). The outer wall of the connecting pipe (330) is provided with a first external thread (331), and the hole wall of the second through hole (220) is provided with a first internal thread (221). The connecting pipe (330) and the first through hole (210) are connected by the first external thread (331) and the first internal thread (221), and a first sealant is provided between the first external thread (331) and the first internal thread (221).

3. The optical fiber end sealing device according to claim 1, characterized in that: The extrusion member (320) is a compression spring, and the two ends of the compression spring abut against the end face of the extrusion chamber (300B) and the piston (310), respectively.

4. The optical fiber end sealing device according to claim 1, characterized in that: The end face of the extrusion chamber (300B) is provided with an exhaust hole.

5. The optical fiber end sealing device according to claim 1, characterized in that: The fiber end sealing device further includes a fiber sealing element (400), which is installed in the first through hole (210). The two ends of the fiber sealing element (400) are respectively provided with a fiber inlet hole (410) and a fiber outlet hole (420). The fiber inlet hole (410) and the fiber outlet hole (420) are connected. Both the fiber inlet hole (410) and the fiber outlet hole (420) are connected to the hollow through hole (100A). The fiber passes through the channel connected by the fiber inlet hole (410) and the fiber outlet hole (420).

6. The optical fiber end sealing device according to claim 5, characterized in that: The channel between the fiber inlet (410) and the fiber outlet (420) is filled with a second sealant.

7. The optical fiber end sealing device according to claim 5, characterized in that: The outer surface of the fiber optic seal (400) is provided with a second external thread (430), and the first through hole (210) is provided with a second internal thread (211). The fiber optic seal (400) and the second through hole (220) are connected by the second external thread (430) and the second internal thread (211), and a third sealant is provided between the second external thread (430) and the second internal thread (211).

8. The optical fiber end sealing device according to claim 1, characterized in that: The flange (200) is also provided with a plurality of connection holes (230), through which fasteners pass and are fastened to the fiber composite insulator (100).

9. The optical fiber end sealing device according to claim 1, characterized in that: The flange (200) is also provided with a sealing groove (240), which is located on the contact surface between the flange (200) and the optical fiber composite insulator (100) and is closed around the position of the hollow through hole (100A). A sealing ring (241) is provided inside the sealing groove (240).

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