A high-voltage resistant optical fiber adapter

Abstract

This utility model discloses a high-voltage resistant optical cable adapter, which includes a main cable cavity and branch cable cavities, with an insulator between the main cable cavity and the branch cable cavities. This optical cable adapter is used outdoors in harsh environments such as rain, dust, and electromagnetic interference. The perforations in the main cable cavity, branch cable cavities, and insulator form a sealed internal optical path, preventing current from "creeping" from the surface of the optical cable of the optical sensor in a high-voltage environment. Furthermore, the overall structure of the optical cable adapter is simple and has significant practical value.

Description

Technical Field

[0001] This utility model relates to the technical field of optical cable connection devices, specifically to a high-voltage resistant optical cable adapter. Background Technology

[0002] China is a major producer and user of electric power, with widespread use of high-voltage electricity in industrial and commercial settings. For example, in the rail transit industry, the current collection relationship between the pantograph and the contact wire is crucial. Urban rail transit typically provides 1500V DC voltage, while high-speed rail often provides 25kV AC voltage. On high-speed trains, power is drawn from the contact wire via a pantograph mounted on the roof of the carriage. Therefore, optical sensors immune to electromagnetic interference (such as silicon photonic sensors) are increasingly being directly attached to the pantograph head. Examples include silicon photonic accelerometers and silicon photonic contact force sensors, which can detect the dynamic mechanical relationship between the pantograph and the contact wire, playing a positive role in train operation and maintenance.

[0003] Furthermore, although non-conductive optical fibers are used as the signal transmission medium, in industrial applications, the optical fibers are clad with a "low-smoke, halogen-free, flame-retardant, and hydrophobic" outer layer. This cladding serves to protect the internal optical fibers and also prevent creepage. However, on a moving train, the dynamic friction between the pantograph's carbon contact plate and the contact wire causes a large amount of frictional carbon and copper dust to fall and adhere to the optical sensor's cable cladding. Therefore, there is a risk that current may creep along this paste-like carbon / copper dust adhering to the cable cladding and enter the train car.

[0004] Currently, no industrial products designed to prevent fiber optic cable creepage are available for applications in the aforementioned harsh environments. Fiber optic adapters solve this problem. Patent CN202323309954.4 discloses a male-female fiber optic quick-connect system, comprising: an adapter, including a connector body and a connecting device for quick connection of fiber optic cables; and an adapter, fitted onto the outside of the adapter, comprising a male-female adapter, a first rubber ring, a first outer shell, a second rubber ring, and a second outer shell connected in sequence. The male-female adapter is fitted onto the connector body, the first outer shell is fitted onto the connecting device, and the second outer shell is fitted onto the fiber optic cable. The male-female adapter, the first outer shell, and the second outer shell prevent the adapter from contacting contaminants. This adapter can prevent dust, sewage, and other impurities from entering the adapter, but it cannot be used in high-voltage environments. Utility Model Content

[0005] The purpose of this invention is to provide a high-voltage resistant optical cable adapter to solve the problem that existing adapters cannot be used in high-voltage environments.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A high-voltage resistant optical cable adapter includes a main cable cavity and a branch cable cavity, with an insulator provided between the main cable cavity and the branch cable cavity, and the insulator having a through hole penetrating the main cable cavity and the branch cable cavity.

[0008] Furthermore, the branch cable cavity is a hollow, sealed structure formed by the branch cable shell cover, the branch cable shell seat, and the branch cable shell, and the branch cable shell cover and the branch cable shell seat are respectively locked to the branch cable shell by screws;

[0009] The main cable cavity is a hollow, sealed structure formed by the main cable shell cover, the main cable shell seat, and the main cable shell. The main cable shell cover and the main cable shell seat are respectively locked to the main cable shell by screws.

[0010] Furthermore, a split cable socket is provided on the outer wall of the split cable housing, and the split cable socket is used to insert an external optical cable and is interconnected with the internal optical fiber in the split cable cavity;

[0011] The outer wall of the main cable housing is provided with a main cable socket, and the main cable socket is embedded with an MPO insert.

[0012] The internal optical fibers inside the branch cable cavity are bundled to form a bundled multi-core optical cable. The bundled multi-core optical cable is connected to the MPO ferrule embedded in the main cable socket through the perforation of the insulator.

[0013] Furthermore, a split cable socket is provided on the outer wall of the split cable housing, and the split cable socket is used to insert an external optical cable and is interconnected with the internal optical fiber in the split cable cavity;

[0014] The outer wall of the main cable housing is provided with a main cable socket, and the inner wall of the main cable housing is provided with a plug corresponding to the main cable socket;

[0015] The optical fiber inside the branch cable cavity is directly connected to the corresponding plug of the main cable socket through the perforation of the insulator.

[0016] Furthermore, an opening is formed on the outer wall of the splitter cable housing to allow the splitter cable cavity to enter, and a gland connector for locking the external optical cable is fixedly installed on the outer wall of the splitter cable housing at a position corresponding to the opening.

[0017] The external optical cable enters the branch cable cavity through the gland on the outer wall of the branch cable shell and connects with the internal optical fiber. The internal optical fiber is bundled to form a bundled multi-core optical cable. The bundled multi-core optical cable is connected to the MPO ferrule embedded in the main cable socket through the perforation of the insulator.

[0018] Furthermore, an opening for the branch cable cavity is also provided on the outer wall of the main cable housing, and a gland for locking the external optical cable is fixedly installed on the outer wall of the main cable housing at the position corresponding to the opening;

[0019] The external optical cable enters the branch cable cavity through the gland on the outer wall of the branch cable housing and connects with the internal optical fiber. The internal optical fiber is connected to the optical cable flange installed inside the main cable cavity through the perforation of the insulator. The optical cable flange is connected to the optical fiber connector of the instrument outside the main cable cavity.

[0020] Furthermore, one end of the insulator passes through the main cable housing and extends into the main cable cavity, leaving a gap between it and the main cable housing cover. A main cable housing filler for fixing the insulator is provided between the outer periphery of the cylindrical structure inside the main cable cavity and the main cable housing.

[0021] The other end of the insulator passes through the branch cable housing and extends into the branch cable cavity, leaving a gap between it and the branch cable housing cover. A branch cable housing filler for fixing the insulator is provided between the outer periphery of the cylindrical structure inside the branch cable cavity and the branch cable housing.

[0022] Furthermore, the four corners of the main cable housing cover are fixed to four overhead insulators by means of threads.

[0023] Furthermore, a main cable housing cover sealing ring is provided at the connection between the main cable housing cover and the main cable housing, and a main cable housing seat sealing ring is provided at the connection between the main cable housing seat and the main cable housing.

[0024] A branch cable housing sealing ring is provided at the connection between the branch cable housing base and the branch cable housing, and a branch cable housing cover sealing ring is provided at the connection between the branch cable housing cover and the branch cable housing.

[0025] Furthermore, an insulator filler is provided around the through hole of the insulator.

[0026] The beneficial effects of this utility model are as follows: The high-voltage resistant optical cable adapter provided by this utility model is used for the connection between optical sensors and query instruments. It can play the role of multiple optical cables bundled or transferred. Especially when used outdoors in harsh environments such as rain, dust and electromagnetic fields, a sealed internal optical path is formed through the perforations of the main cable cavity, branch cable cavities and insulators, thereby preventing current from "creeping" from the surface of the optical cable of the optical sensor in a high-voltage environment. Moreover, the overall structure of the optical cable adapter is simple and has great practical value. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the high-voltage resistant optical cable adapter of this utility model;

[0028] Figure 2 This is a schematic diagram of the working mechanism of the high-voltage resistant optical cable adapter of this utility model;

[0029] Figure 3 This is a cross-sectional structural diagram of the high-voltage resistant optical cable adapter of this utility model;

[0030] Figure 4 This is a schematic diagram of the installation structure of the gland of the high-voltage resistant optical cable adapter on the outer wall of the housing according to Embodiment 3 of this utility model.

[0031] Figure label:

[0032] 1. Main cable socket; 2. Main cable housing; 3. Main cable housing; 4. Insulator; 5. Elevated insulator; 6. Branch cable housing; 7. Branch cable socket; 8. Branch cable housing; 9. Main cable housing cover; 10. MPO ferrule; 11. Main cable housing cover sealing ring; 12. Bundled multi-core optical cable; 12-1, Fiber 1, 12-2, Fiber 2; 12-(n-1), Fiber n-1; 12-n, Fiber n; 13. Main... 14. Main cable housing seal ring; 15. Branch cable housing seal ring; 16. Branch cable housing cover seal ring; 17. Insulator filler; 18. Branch cable housing filler; 19. Branch cable housing cover; 20. Through hole; 21. Perforation; 22. Gland; 23. Internal optical fiber; 24. Optical cable flange; 25. Sensor optical cable connector; 26. Housing; 27. Internal optical fiber connector; 28. Optical cable; 29. ​​Optical sensor.

[0033] n is the total number of optical fibers distributed in the bundled multi-core optical cable. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments.

[0035] It should be noted that the illustrations provided in this utility model are only schematic representations of the basic concept of this utility model. The illustrations only show the components related to this utility model and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0036] The orientations or positional relationships indicated by terms such as "upper", "lower", "middle", "inner", "outer", "axial", "one end", "the other end", and "periphery" used in this utility model are based on the relative orientations or positional relationships shown in the accompanying drawings and are not intended to be absolute limitations on this utility model.

[0037] This utility model provides a technical solution for a high-voltage resistant optical cable adapter, and the following is a detailed description of each aspect.

[0038] Example 1

[0039] See Figure 1 The present invention discloses a structural schematic diagram of a high-voltage resistant optical cable adapter. The optical cable adapter includes a main cable cavity and a branch cable cavity. An insulator 4 is provided between the main cable cavity and the branch cable cavity. The main cable cavity is located at the lower part of the high-voltage resistant optical cable adapter, and the branch cable cavity is located at the lower part of the high-voltage resistant optical cable adapter. The overall structure is in the shape of a dumbbell.

[0040] Insulator 4 is located between the main cable cavity and the branch cable cavity. Inside insulator 4 is a through hole 21 that penetrates both the main cable cavity and the branch cable cavity. The through hole 21 extends along the longitudinal central axis of insulator 4 through both ends of insulator 4. Insulator 4 is a high-voltage insulator 4, capable of withstanding DC or AC currents up to 35000V. Insulator 4 is used to isolate current "creeping" from one end of the branch cable shell 6, ensuring the safety of the other end of insulator 4.

[0041] The outer wall of the branch cable cavity is provided with a branch cable socket 7, such as an FC flange, for connecting optical cables from optical sensors operating in high-voltage, strong electromagnetic environments, and interconnecting with the internal optical fiber 23. The branch cable socket 7 is interconnected with the internal optical fiber 23 inside the branch cable cavity; the outer wall of the main cable cavity is provided with a main cable socket 1, i.e., an industrial-grade multi-core fiber optic aviation socket, which is dustproof and waterproof. The main cable socket 1 is embedded with an MPO ferrule 10, ensuring unobstructed optical paths from each branch cable socket 7 to the main cable socket 1 inside the optical cable adapter. Both the branch cable socket 7 and the main cable socket 1 are waterproof and dustproof sockets.

[0042] The internal optical fibers 23 inside the branch cable cavity are bundled to form a bundled multi-core optical cable 12. The bundled multi-core optical cable 12 is a single multi-core optical cable that passes through the perforation 21 of the insulator 4 and enters the main cable cavity to connect with the MPO ferrule 10.

[0043] See the cross-sectional structural diagram of the high-voltage resistant optical cable adapter disclosed in this utility model. Figure 3 The main cable cavity is a hollow, sealed structure with a rectangular outer contour, formed by the main cable shell cover 9, the main cable shell seat 2, and the main cable shell 3. The main cable cavity allows the bundled multi-core optical cable 12, which is connected to the MPO ferrule 10, to pass through and enter the through hole 21 of the insulator 4.

[0044] The main cable housing cover 9 and the main cable housing base 2 are respectively locked to the main cable housing 3 with screws, forming a cuboid structure where the main cable housing cover 9 is located below the entire main cable cavity, the main cable housing base 2 is located above the entire main cable cavity, and the main cable housing 3 is located between the main cable housing cover 9 and the main cable housing base 2. Furthermore, the four protruding parts of the main cable housing cover 9 are provided with threaded holes, which secure the main cable housing cover 9 to the four raised insulators 5 by means of threads. The purpose of the raised insulators 5 is to raise the high-voltage resistant optical cable adapter and prevent electrical breakdown between the high-voltage resistant optical cable adapter and the mounting surface.

[0045] A sealing ring for the main cable housing cover 9 and the main cable housing 3 is provided at the connection point of the main cable housing cover 9, and a sealing ring for the main cable housing seat 22 is provided at the connection point of the main cable housing seat 2 and the main cable housing 3. On the one hand, this prevents dust and water from entering the interior of the main cable housing 3 through the gap between the main cable housing 3 and the main cable housing cover 9, and prevents contamination of its internal optical fibers and / or (optical fiber) connectors; on the other hand, this prevents dust and water from entering the interior of the main cable housing 3 through the gap between the main cable housing seat 2 and the main cable housing 3, and prevents contamination of its internal optical fibers and / or (optical fiber) connectors.

[0046] One end (lower end) of the insulator 4 passes through the main cable housing 2 and extends into the main cable cavity, leaving a gap between it and the main cable housing cover 9. This gap allows the bundled multi-core optical cable 12 in the perforation 21 of the insulator 4 to pass smoothly through the main cable cavity. A main cable housing filler 14 for fixing the insulator 4 is provided between the outer periphery of the cylindrical structure extending into the main cable cavity and the main cable housing 2. Thus, the area above the horizontal plane of the lower end of the insulator 4 extending into the main cable cavity and the main cable housing cover 9 is completely filled with the main cable housing filler 14. The main cable housing filler 14 securely mounts the insulator 4 onto the main cable housing 2, preventing the insulator 4 from being unstable. The main cable housing filler 14 is made of waterproof and water-repellent materials such as cement or silicone, used to prevent dust and water from entering the main cable cavity from the gap between the main cable housing 2 and the insulator 4, and to prevent contamination of the internal optical fiber and / or (optical fiber) connector.

[0047] The other end (upper end) of the insulator 4 extends through the branch cable housing 8 into the branch cable cavity, leaving a gap between it and the branch cable housing cover 19. This gap allows the independent internal optical fiber 23 within the branch cable cavity to pass through and enter the through-hole 21 of the insulator 4. A branch cable housing filler 18 for fixing the insulator 4 is provided between the outer periphery of the cylindrical structure extending into the branch cable cavity and the branch cable housing 8. Thus, the area below the horizontal plane of the upper end of the insulator 4 extending into the branch cable cavity and the branch cable housing cover 19 is completely filled with the branch cable housing filler 18. The branch cable housing filler 18 ensures that the insulator 4 is securely mounted on the branch cable housing 8, preventing any instability in the insulator 4.

[0048] The branch cable housing filler 18 is made of waterproof and hydrophobic materials such as cement or silicone. It is used to prevent dust and water from entering the branch cable cavity from the gap between the branch cable housing 8 and the insulator 4. This serves two purposes: first, to prevent contamination of the internal optical fiber and / or (optical fiber) connector; and second, to prevent sewage from entering the main cable cavity from the branch cable cavity and through the through hole 20 of the insulator 4 via the main cable housing 2, thus preventing creepage inside the insulator 4.

[0049] The branch cable cavity is a hollow, sealed structure with a rectangular outer contour, formed by the branch cable cover 19, the branch cable cover seat 8, and the branch cable housing 6. The branch cable cavity allows numerous internal optical fibers 23 to be bundled together to form a bundled multi-core optical cable 12, which enters the through-hole 21 of the insulator 4. The internal optical fibers 23 are connected to the corresponding plugs of the branch cable socket 7 within the branch cable housing 6, and the bundled multi-core optical cable 12 is connected to the corresponding plugs of the main cable socket 1 within the main cable housing 3, and subsequently connected to the MPO ferrule. The branch cable cover 19 and the branch cable cover seat 8 are respectively locked to the branch cable housing 6 by screws.

[0050] The connection between the main cable housing cover 9 and the main cable housing 3 is provided with a main cable housing cover sealing ring 11 to prevent dust and water from entering the main cable cavity from the gap between the main cable housing 3 and the main cable housing cover 9, and to prevent contamination of the internal optical fiber and / or (optical fiber) connector; the connection between the main cable housing base 2 and the main cable housing 3 is provided with a main cable housing base sealing ring 13 to prevent dust and water from entering the main cable cavity from the gap between the main cable housing base 2 and the main cable housing 3, and to prevent contamination of the internal optical fiber and / or (optical fiber) connector.

[0051] The working principle of this high-voltage resistant optical cable adapter is explained as follows:

[0052] For a detailed diagram illustrating the working mechanism of the high-voltage resistant optical cable adapter, please refer to [link / diagram]. Figure 2 Taking high-speed rail pantograph-catenary inspection as an example, high-speed rail uses 3.5kV or 27.5kV AC power. To solve the problem of creepage, the high-voltage resistant optical cable adapter of this invention can be used. An insulator 4 with a withstand voltage greater than the contact wire voltage isolates the branch cable from the sensor and the main cable entering the carriage outside the optical cable adapter. The sensor's branch cable and...

[0053] The outer wall of the branch cable housing 6 is provided with a branch cable socket 7 for insertion, so that the sensor's branch cable can be connected to the internal optical fiber 23. Figure 2The display shows a total of 12 optical fibers. Of course, in actual use, the number of internal optical fibers can be increased or decreased as needed. After the internal optical fibers 23 are bundled, they form a bundled multi-core optical cable 12, which enters the main cable cavity through the perforation 21 of the insulator 4. It connects to the plug of the corresponding main cable socket 1 on the inner wall of the main cable housing 3, and then connects to the MPO ferrule 10 embedded in the main cable socket 1 on the outer wall of the main cable housing 3. The MPO ferrule 10 is also connected to the external query instrument or mediator. The entire high-voltage resistant optical cable adapter has a sealed internal structure. Both the branch cable socket 7 and the main cable socket 1 are waterproof and dustproof sockets, such as industrial-grade multi-core optical fiber sockets. The internal optical fibers 23, through the above-mentioned flow from the branch cable cavity, insulator, and then to the main cable cavity, isolate the current "crawling" from external dust, rainwater, etc. at one end of the branch cable cavity, so that the main cable cavity to the query instrument or mediator end is in a safe state.

[0054] Example 2

[0055] This embodiment provides a high-voltage resistant optical cable adapter. The outer wall of the main cable housing 3 is provided with a main cable socket 1, and the number of main cable sockets 1 is the same as the number of branch cable sockets 7. The inner wall of the main cable housing 3 is provided with a plug corresponding to the main cable socket 11. The internal optical fiber 23 in the branch cable cavity does not need to pass through the multi-core optical cable 12 that does not need to be bundled. The internal optical fiber 23 is directly connected to the plug corresponding to the main cable socket 1 through the through hole 21 of the insulator 4. There is no embedded MPO ferrule in the main cable socket 1 outside the main cable cavity. The other structural settings and installation methods of the high-voltage resistant optical cable adapter in this embodiment are the same as those in embodiment 1.

[0056] Example 3

[0057] This embodiment provides a high-voltage resistant optical cable adapter. A gland 22 for locking and sealing external cables is provided on the outer wall of the branch cable housing 6 or the main cable housing 3. A schematic diagram of the installation structure of the gland 22 on the outer wall of the housing 26 is shown below. Figure 4 As shown, the outer wall of the housing 26 (which can be the branch cable housing 6 or the main cable housing 3) has an opening for entering the branch cable cavity or the main cable cavity. In this embodiment, the opening for entering the branch cable cavity is taken as an example. A gland 22 for locking the external optical cable is fixedly installed on the outer wall of the branch cable housing 6 at the position corresponding to the opening. The external optical cable can be the optical cable 28 from the optical sensor 29 element. After the optical cable 28 is locked by the gland 22, it isolates the inside of the branch cable cavity from the outside, thereby preventing external rainwater, dust, etc. from entering the inside of the branch cable cavity and isolating the current "crawling" from one end of the branch cable cavity, so that the other end of the insulator is in a safe state.

[0058] Here, since the gland 22 acts as an insulator, the optical cable flange 24 inside the splitter cable cavity can be a conventional non-waterproof, dustproof optical cable flange 24. The optical cable 28 from the optical sensor 29 enters the splitter cable cavity and is inserted into the optical cable flange 24, thereby connecting with the internal optical fiber 23 inside the splitter cable cavity. The internal optical fiber 23 is bundled to form a bundled multi-core optical cable 12. The bundled multi-core optical cable 12 is connected to the corresponding plug in the main cable socket 1 inside the main cable housing 3 through the through hole 21 of the insulator 4, and then connected to the MPO ferrule 10 embedded in the main cable socket 1. The other structural settings and installation methods of the high-voltage resistant optical cable adapter in this embodiment are the same as in embodiment 1.

[0059] Similarly, if an opening for entering the branch cable cavity or the main cable cavity is also made on the outer wall of the main cable housing 3, a gland 22 for locking the external optical cable is fixedly installed on the outer wall of the main cable housing 3 at the position corresponding to the opening.

[0060] The optical cable 28 from the optical sensor 29 enters the branch cable cavity and is inserted into the optical cable flange 24, and then connects with the internal optical fiber 23 in the branch cable cavity. The internal optical fiber 23 is bundled to form a bundled multi-core optical cable 12. The bundled multi-core optical cable 12 passes through the through hole 21 of the insulator 4 and is then connected to the optical cable flange 24 set in the main cable cavity or on the inner wall of the main cable housing 3. The optical cable flange 24 is embedded with an MPO ferrule. The MPO ferrule 10 is connected to the external optical fiber of the external query instrument or demodulator through the opening on the main cable housing 3 and the gland 22. Since the gland 22 has the function of waterproof and dustproof, the optical cable flange 24 in the main cable cavity can also be a conventional optical cable flange 24, which does not need to be waterproof and dustproof.

Claims

1. A high voltage resistant fiber optic cable adapter, comprising: The optical cable adapter includes a main cable cavity and a branch cable cavity. An insulator (4) is provided between the main cable cavity and the branch cable cavity. The insulator (4) has a through hole (21) that passes through the main cable cavity and the branch cable cavity.

2. The high voltage resistant fiber optic cable adapter of claim 1, wherein, The branch cable cavity is a hollow, sealed structure formed by the branch cable shell cover (19), the branch cable shell seat (8), and the branch cable shell (6). The branch cable shell cover (19) and the branch cable shell seat (8) are respectively locked to the branch cable shell (6) by screws. The main cable cavity is a hollow, sealed structure formed by the main cable shell cover (9), the main cable shell seat (2), and the main cable shell (3). The main cable shell cover (9) and the main cable shell seat (2) are locked to the main cable shell (3) by screws.

3. The high voltage resistant fiber optic cable adapter of claim 2, wherein, The outer wall of the split cable housing (6) is provided with a split cable socket (7), which is used to insert an external optical cable and connect to the internal optical fiber (23) inside the split cable cavity; The main cable housing (3) is provided with a main cable socket (1) on its outer wall, and the main cable socket (1) is provided with an MPO insert (10). The internal optical fibers (23) inside the branch cable cavity are bundled to form a bundled multi-core optical cable (12). The bundled multi-core optical cable (12) is connected to the MPO ferrule (10) embedded in the main cable socket (1) through the perforation (21) of the insulator (4).

4. The high voltage resistant fiber optic cable adapter of claim 2, wherein, The outer wall of the split cable housing (6) is provided with a split cable socket (7), which is used to insert an external optical cable and connect to the internal optical fiber (23) inside the split cable cavity; The outer wall of the main cable housing (3) is provided with a main cable socket (1), and the inner wall of the main cable housing (3) is provided with a plug corresponding to the main cable socket (1); The internal optical fiber (23) inside the branch cable cavity is directly connected to the plug corresponding to the main cable socket (1) through the perforation (21) of the insulator (4).

5. The high voltage resistant fiber optic cable adapter of claim 2, wherein, The outer wall of the split cable housing (6) has an opening for entering the split cable cavity, and a gland (22) for locking the external optical cable is fixedly installed on the outer wall of the split cable housing (6) at the position corresponding to the opening. The external optical cable enters the cavity of the branch cable through the gland (22) on the outer wall of the branch cable housing (6) and connects with the internal optical fiber (23). The internal optical fiber (23) is bundled to form a bundled multi-core optical cable (12). The bundled multi-core optical cable (12) is connected to the MPO ferrule (10) embedded in the main cable socket (1) through the perforation (21) of the insulator (4).

6. The high voltage resistant fiber optic cable adapter of claim 2, wherein, The outer wall of the main cable housing (3) also has an opening for entering the branch cable cavity, and the gland (22) for locking the external optical cable is fixedly installed on the outer wall of the main cable housing (3) at the position corresponding to the opening. The external optical cable enters the branch cable cavity through the gland (22) on the outer wall of the branch cable housing (6) and connects with the internal optical fiber (23). The internal optical fiber (23) is connected to the optical cable flange (24) set in the (1) of the main cable cavity through the perforation (21) of the insulator (4). The optical cable flange (24) is connected to the connector of the optical fiber of the instrument outside the main cable cavity.

7. The high voltage resistant fiber optic cable adapter of claim 2, wherein, One end of the insulator (4) passes through the main cable housing (2) and extends into the main cable cavity, leaving a gap between it and the main cable housing cover (9). A main cable housing filler (14) for fixing the insulator (4) is provided between the outer periphery of the cylindrical structure inside the main cable cavity and the main cable housing (2). The other end of the insulator (4) extends through the branch cable housing (8) into the branch cable cavity and leaves a gap between it and the branch cable housing cover (19). A branch cable housing filler (18) for fixing the insulator (4) is provided between the outer periphery of the cylindrical structure inside the branch cable cavity and the branch cable housing (8).

8. The high voltage resistant fiber optic cable adapter of claim 2, wherein, The four corners of the main cable housing cover (9) are fixed to the four overhead insulators (5) by means of threads.

9. The high voltage resistant fiber optic cable adapter of claim 2, wherein, The connection between the main cable housing cover (9) and the main cable housing (3) is provided with a main cable housing cover sealing ring (11), and the connection between the main cable housing seat (2) and the main cable housing (3) is provided with a main cable housing seat sealing ring (13). A branch cable housing sealing ring (15) is provided at the connection between the branch cable housing base (8) and the branch cable housing (6), and a branch cable housing cover sealing ring (16) is provided at the connection between the branch cable housing cover (19) and the branch cable housing (6).

10. The high voltage resistant fiber optic cable adapter of claim 1, wherein, The insulator (4) has an insulator filler (17) around the perforation (21) inside the through hole (20).

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