Watertight optical cable splicing device

Abstract

The utility model discloses a watertight optical cable splicing device which comprises a support, a sleeve, a connector and an outer clamping sleeve assembly, the support is arranged in the sleeve in a penetrating mode, one end of the sleeve is detachably and fixedly connected with the connector, and the support in the sleeve is detachably and fixedly connected with an optical fiber adapter. One end of the support and the other end of the connector are respectively provided with an access hole used for accessing the optical cable, and the access hole is connected with an outer clamping sleeve assembly so as to detachably fix and seal the accessed optical cable and the access hole. A firm protective shell is provided for splicing of the optical cable, meanwhile, the optical fiber adapter is installed on the support in advance, the optical fiber connector is manufactured on the optical cable in advance, splicing can be achieved only by inserting the optical fiber connector into the optical fiber adapter in the field installation process, the field installation is easy and convenient, the overall structure is compact, and the needed installation space is small.

Description

Technical Field

[0001] This utility model relates to the field of optical cable splicing technology, and in particular to a watertight optical cable splicing device. Background Technology

[0002] When optical cables are laid and used in outdoor, underground, duct, or underwater environments, their connection points (including fusion splices and connector terminations) are easily exposed to moisture, humidity, or corrosive liquids. These factors can lead to performance degradation of fiber optic connection points, increased signal transmission loss, and in the long term, even corrosion, causing optical path interruption. Therefore, ensuring the waterproof sealing of connection points is crucial in harsh environments such as humid, water-immersed, or high-pressure conditions.

[0003] Currently, while protective devices such as fiber optic splice boxes and fiber optic joint boxes possess basic sealing functions, their waterproof performance and long-term reliability remain insufficient under extreme conditions such as prolonged immersion in water, deep-sea high pressure, or frequent temperature and humidity changes. Furthermore, some existing high watertight solutions (such as fiber optic connectors or joints used for underwater applications, which typically employ very complex sealing structures) often require specialized tools and technicians for on-site installation, increasing the difficulty of on-site operation and limiting their practical application.

[0004] Therefore, there is an urgent need for a new watertight optical cable splicing device to solve the above-mentioned technical problems. Utility Model Content

[0005] The present invention aims to solve the above-mentioned technical problems, namely, to solve the following problems: First, although existing protective devices such as optical cable junction boxes and optical cable splice boxes have basic sealing functions, their waterproof performance and long-term reliability are still insufficient under extreme conditions such as long-term immersion in water, deep water pressure, or frequent changes in temperature and humidity; Second, some existing high watertight solutions often require professional tools and technicians for on-site installation, which increases the difficulty of on-site operation and limits their practical application.

[0006] To this end, the present invention provides a watertight optical cable splicing device, comprising a bracket, a sleeve, a connector, and an outer clamping assembly. The sleeve has a first through hole and a second through hole that are interconnected. A step is formed at the connection between the first through hole and the second through hole. The bracket passes through the first through hole and the second through hole. One end of the sleeve is detachably and fixedly connected to the connector. One end of the connector extends into the sleeve to abut against the bracket, and the bracket is secured in the sleeve by the step. A seal is formed between one end of the bracket and the sleeve, and a seal is formed between the connector and the sleeve. An optical fiber adapter is detachably and fixedly connected to the bracket inside the sleeve. One end of the bracket and the other end of the connector are provided with an inlet hole for inserting an optical cable to connect with the optical fiber adapter. The inlet hole is connected to an outer clamping assembly to detachably fix and seal the inserted optical cable to the inlet hole.

[0007] In a specific embodiment of the above-mentioned watertight optical cable splicing device, the bracket includes a first connecting section, an intermediate section, and a second connecting section. One end of the first connecting section is fixedly connected to one end of the second connecting section through the intermediate section. The first connecting section is provided with an inlet hole. The other end of the first connecting section passes through the first inlet hole and forms a seal with the first inlet hole. A protrusion that mates with a step is fixed on the outer wall of the first connecting section. The optical fiber adapter is installed on the intermediate section. The second connecting section is located in the second inlet hole and is provided with a third inlet hole. One end of the intermediate section is provided with a first opening communicating with the inlet hole. The other end of the intermediate section is provided with a second opening communicating with the third inlet hole. When one end of the connector is in abutting state with the second connecting section, the protrusion abuts against the step.

[0008] In the specific implementation of the above-mentioned watertight optical cable splicing device, the first connecting segment and the second connecting segment are both cylindrical structures, the middle segment is a flat plate structure, the middle segment is provided with a stepped hole, and the optical fiber adapter passes through the stepped hole and is detachably and fixedly connected to the middle segment through fasteners.

[0009] In a specific embodiment of the above-mentioned watertight optical cable splicing device, the second connecting section is provided with a plurality of circumferentially distributed slots. One end of the connector is fixed with a plug that is the same number as the number of slots and corresponds one-to-one. When the connector and the sleeve are in a connected state, the plug is inserted into the corresponding slot and exerts a squeezing force on it to make the bracket lock in the sleeve.

[0010] In a specific embodiment of the above-mentioned watertight optical cable splicing device, one end of the sleeve is threadedly connected to the connector, and the sleeve and the connector are auxiliaryly fixed by a fastening screw, the center line of the fastening screw being perpendicular to the center line of the sleeve.

[0011] In a specific embodiment of the above-mentioned watertight optical cable splicing device, at least two spaced first sealing rings are sleeved on the first connecting segment to form a seal with the first through hole, and at least two spaced second sealing rings are sleeved on the outer wall of the connector to form a seal with the second through hole.

[0012] In a specific embodiment of the above-mentioned watertight optical cable splicing device, the end of the connector facing the bracket is provided with a groove, and the inlet hole on the connector is connected to the groove. The watertight optical cable splicing device also includes an inner ferrule assembly, which is disposed in the groove and connected to the inlet hole on the connector to detachably fix and seal the optical fiber core wire in the inserted optical cable to the inlet hole.

[0013] In a specific embodiment of the above-mentioned watertight optical cable splicing device, the inner ferrule assembly includes an inner ferrule kit, a first nut, a first ferrule holder, and a second ferrule holder. One end of the inner ferrule kit extends into the through hole of the connector and is threadedly connected thereto, and a seal is formed between the inner ferrule kit and the bracket. The inner ferrule kit has a fourth through hole that allows the optical fiber core to pass through. The first nut is fitted onto the other end of the inner ferrule kit and is threadedly connected thereto. The first ferrule holder and the second ferrule holder are sequentially arranged between the first nut and the inner ferrule kit along a direction away from the through hole, and each has a fifth through hole that allows the optical fiber core to pass through. When the first nut and the inner ferrule kit are in the connected state, the second ferrule holder and the first ferrule holder are squeezed by the first nut to seal and fix the inner ferrule kit and the inserted optical fiber core in a clamping manner.

[0014] In a specific embodiment of the above-mentioned watertight optical cable splicing device, the first ferrule is a conical structure, and the first ferrule is provided with a conical hole and a first clamping hole that are interconnected. The second ferrule is a cylindrical structure, and the second ferrule is provided with a second clamping hole. One end of the outer wall of the second ferrule is set as a conical surface that mates with the conical hole. The other end of the inner ferrule is provided with a conical surface that mates with the conical surface of the first ferrule.

[0015] In a specific embodiment of the above-mentioned watertight optical cable splicing device, the outer ferrule assembly includes an outer ferrule kit, a second nut, a third ferrule holder, and a fourth ferrule holder. One end of the outer ferrule kit extends into the corresponding through hole and is threadedly connected thereto, and a seal is formed between the outer ferrule kit and the corresponding connector or bracket. The outer ferrule kit is provided with a sixth through hole for the optical cable to pass through. The second nut is fitted onto the other end of the outer ferrule kit and is threadedly connected thereto. The third and fourth ferrule holders are sequentially arranged between the second nut and the outer ferrule kit along a direction away from the through hole, and each of them is provided with a seventh through hole for the optical fiber core to pass through. When the second nut and the outer ferrule kit are in the connected state, the fourth and third ferrule holders are squeezed by the nut to seal and fix the outer ferrule kit and the inserted optical cable in a clamping manner.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. This utility model places the connection point of the two optical cables inside the sleeve, providing a sturdy protective shell for the splicing of the optical cables. At the same time, the optical fiber adapter is pre-installed on the bracket and the optical fiber connector is pre-made on the optical cable. During on-site installation, the splicing can be achieved simply by inserting the optical fiber connector into the optical fiber adapter. This not only simplifies on-site installation, but also has a compact overall structure, requires little installation space, and is convenient for installation and deployment in narrow or space-constrained places.

[0018] 2. The outer ferrule assembly seals the optical cable and the access hole by compression clamping. The bracket and connector are sealed with the access hole by sealing rings. The cooperation of these two improves the sealing reliability and can effectively prevent external fluids (liquid or gas) from entering the sleeve, ensuring the long-term stable operation of the optical cable connection point. At the same time, by setting an inner ferrule assembly inside the connector to clamp the optical fiber core of the optical cable, an additional layer of sealing is added, which improves the sealing performance during on-site assembly and can adapt to various scenarios with high water tightness requirements.

[0019] 3. The outer ferrule assembly, inner ferrule assembly, and the connection between the connector and the sleeve all adopt threaded connection, so the optical cable can be connected on site without the need for professional tools, making the operation simpler and more convenient. Attached Figure Description

[0020] The preferred embodiments of this utility model are described below with reference to the accompanying drawings, in which:

[0021] Figure 1 This is a schematic diagram of the structure of the watertight optical cable splicing device provided by this utility model;

[0022] Figure 2 yes Figure 1 Schematic diagram of the mid-support structure;

[0023] Figure 3 yes Figure 2 A cross-sectional view along the AA direction;

[0024] Figure 4 yes Figure 1 Enlarged structural view of the Chinese and foreign ferrule assembly;

[0025] Figure 5 yes Figure 1 Enlarged view of the inner ferrule assembly.

[0026] List of reference numerals in the attached diagram:

[0027] 1. Outer ferrule assembly; 101. Second nut; 102. Inner ferrule assembly; 103. Fourth ferrule holder; 104. Third ferrule holder; 2. First sealing ring; 3. Bracket; 301. First connecting section; 3011. Protrusion; 302. Middle section; 3021. First opening; 3022. Stepped hole; 3023. Second opening; 3024. Fastening hole; 303. Second connecting section; 3031. Third through hole; 3032. Slot; 4. Sleeve; 401. Second through hole; 402. First through hole; 5. Second sealing ring; 6. Fastening screw; 7. Connector; 701. Groove; 702. Plug; 8. Inner ferrule assembly; 801. Outer ferrule assembly; 802. First nut; 803. Second ferrule holder; 804. First ferrule holder; 9. Fastener; 10. Fiber optic adapter; 11. Through hole. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0029] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., 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 utility model and simplifying the description, and do not indicate or imply that the system or component 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 utility model. Furthermore, the use of terms such as "first" and "second" to define components is merely for the convenience of distinguishing the aforementioned components. Unless otherwise stated, these terms have no special meaning and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] This utility model relates to the field of optical cable splicing technology, and in particular to a watertight optical cable splicing device. The purpose is to solve the following problems: First, although existing protective devices such as optical cable junction boxes and optical cable splice boxes have basic sealing functions, their waterproof performance and long-term reliability are still insufficient under extreme conditions such as long-term immersion in water, deep water under high pressure, or frequent changes in temperature and humidity; Second, some existing high watertight solutions often require specialized tools and technicians for on-site installation, increasing the difficulty of on-site operation and limiting their practical application. To this end, the present invention provides a watertight optical cable splicing device, comprising a bracket, a sleeve, a connector, and an outer clamping assembly. The sleeve has a first through hole and a second through hole that communicate with each other. A step is formed at the connection between the first and second through holes. The bracket passes through the first and second through holes. One end of the sleeve is detachably and fixedly connected to the connector. One end of the connector extends into the sleeve to abut against the bracket, and the bracket is secured within the sleeve by the step. A seal is formed between one end of the bracket and the sleeve, and a seal is formed between the connector and the sleeve. An optical fiber adapter is detachably and fixedly connected to the bracket inside the sleeve. One end of the bracket and the other end of the connector... Each end is provided with an access hole for inserting an optical cable to connect with an optical fiber adapter. The access hole is connected to an external sleeve assembly to detachably fix and seal the inserted optical cable to the access hole. This utility model places the connection part of the two optical cables inside the sleeve, providing a robust protective shell for the splicing of the optical cables. At the same time, the optical fiber adapter is pre-installed on the bracket and the optical fiber connector is pre-made on the optical cable. During on-site installation, the splicing can be achieved simply by inserting the optical fiber connector into the optical fiber adapter. This not only simplifies on-site installation, but also makes the overall structure compact, requires little installation space, and is convenient for installation and deployment in narrow or space-constrained places.

[0032] The watertight optical cable splicing device provided in the embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0033] See Figure 1This utility model provides a watertight optical cable splicing device, including a bracket 3, a sleeve 4, a connector 7, and an outer clamping assembly 1. The sleeve 4 is provided with a first through hole 402 and a second through hole 401 that are interconnected. A step is formed at the connection between the first through hole 402 and the second through hole 401. The bracket 3 passes through the first through hole 402 and the second through hole 401. One end of the sleeve 4 is detachably and fixedly connected to the connector 7. One end of the connector 7 extends into the sleeve 4 to abut against the bracket 3 and, with the cooperation of the step, the bracket 3 is locked in the sleeve 4. A seal is formed between one end of the bracket 3 and the sleeve 4, and a seal is formed between the connector 7 and the sleeve 4. An optical fiber adapter 10 is detachably and fixedly connected to the bracket 3 inside the sleeve 4. One end of the bracket 3 and the other end of the connector 7 are provided with an inlet hole 11 for inserting an optical cable to connect with the optical fiber adapter 10. The inlet hole 11 is connected to an outer clamping assembly 1 to detachably fix and seal the inserted optical cable with the inlet hole 11.

[0034] Specifically, such as Figure 1 As shown, the diameter of the first through hole 402 is smaller than the diameter of the second through hole 401, which allows a step to be formed at the connection between the first through hole 402 and the second through hole 401. At least two spaced second sealing rings 5 ​​are fitted on the outer wall of the connector 7 to form a seal with the second through hole 401.

[0035] In the above embodiment, preferably, one end of the sleeve 4 is threadedly connected to the connector 7, and the sleeve 4 and the connector 7 are further secured by a fastening screw 6, the center line of which is perpendicular to the center line of the sleeve 4. The threaded connection between the sleeve 4 and the connector 7 allows for installation without special tools, reducing the difficulty of on-site installation.

[0036] Specifically, a plurality of circumferentially distributed connecting holes are provided on the outer wall of one end of the sleeve 4. The connecting holes extend to the connector 7. The fastening screw 6 is inserted into the connecting hole for threaded connection to achieve auxiliary fixation between the connector 7 and the sleeve 4, making the fixation more secure.

[0037] In one embodiment, see Figures 2-3The bracket 3 includes a first connecting section 301, a middle section 302, and a second connecting section 303. One end of the first connecting section 301 is fixedly connected to one end of the second connecting section 303 through the middle section 302. The first connecting section 301 is provided with an inlet hole 11. The other end of the first connecting section 301 passes through the first through hole 402 and forms a seal with the first through hole 402. A protrusion 3011 that cooperates with the step is fixed on the outer wall of the first connecting section 301. The fiber optic adapter 10 is installed on the middle section 302. The second connecting section 303 is located in the second through hole 401 and is provided with a third through hole 3031. One end of the middle section 302 is provided with a first opening 3021 that communicates with the inlet hole 11. The other end of the middle section 302 is provided with a second opening 3023 that communicates with the third through hole 3031. When one end of the connector 7 is in abutting state with the second connecting section 303, the protrusion 3011 abuts against the step.

[0038] Specifically, the first connecting section 301, the intermediate section 302, and the second connecting section 303 are an integral structure. At least two spaced first sealing rings 2 are fitted on the first connecting section 301. After the first connecting section 301 is inserted into the first through hole 402, the first sealing rings 2 are compressed to form a seal on the surface of the first connecting section 301 that contacts the first through hole 402.

[0039] In addition, a protrusion 3011 is provided on the outer wall of the first connecting section 301. The diameter of the protrusion 3011 is larger than the diameter of the first through hole 402, so that the protrusion 3011 can be locked in the second through hole 401. When the bracket 3 is subjected to the squeezing force of the connector 7, the protrusion 3011 abuts against the step, thereby cooperating with the connector 7 to lock the bracket 3 into the sleeve 4. This installation method is simple and convenient to operate, and can be installed on site without special tools. Through the setting of the first opening 3021 and the second opening 3023, the fiber optic connector of the optical fiber core wire of the optical cable can enter the sleeve 4 through the through hole 11 and the corresponding opening to connect with the optical fiber adapter 10.

[0040] In one embodiment, the first connecting segment 301 and the second connecting segment 303 are both cylindrical structures, while the middle segment 302 is a flat plate structure. The middle segment 302 has a stepped hole 3022, through which the fiber optic adapter 10 passes and is detachably and fixedly connected to the middle segment 302 via a fastener 9. Designing the bracket 3 with this structure results in a lighter weight, reducing the overall weight of the structure.

[0041] Specifically, the stepped portion of the stepped hole 3022 is provided with a fastening hole 3024, and the fastener 9 is a bolt and a nut. The tail end of the bolt passes through the fastening hole 3024 and is threadedly connected to the nut, so that the fiber optic adapter 10 can be detachably and fixedly installed on the bracket 3.

[0042] In one embodiment, the second connecting section 303 is provided with a plurality of circumferentially distributed slots 3032, and one end of the connector 7 is fixed with a plug 702 that is the same number as the number of slots 3032 and corresponds one-to-one. When the connector 7 and the sleeve 4 are in the connected state, the plug 702 is inserted into the corresponding slot 3032 and exerts a squeezing force on it to make the bracket 3 lock in the sleeve 4.

[0043] In the above embodiment, during installation, the sleeve 4 is threadedly connected to the connector 7 by rotating the sleeve 4. A slot 3032 is provided on the second connecting section 303, which not only allows the connector 7 to apply pressure to the bracket 3, securing the bracket 3 inside the tower, but also prevents the bracket 3 from rotating relative to the sleeve 4 when the plug 702 is inserted into the slot 3032, thus improving the stability of the bracket 3 within the sleeve 4.

[0044] In the above embodiment, the connection point of the two optical cables is set inside the sleeve 4, providing a sturdy protective shell for the splicing of the optical cables. At the same time, the fiber optic adapter 10 is pre-installed on the bracket 3, and the fiber optic connector is pre-made on the optical cable. During on-site installation, the splicing can be achieved simply by inserting the fiber optic connector into the fiber optic adapter 10. This not only simplifies on-site installation, but also makes the overall structure compact, requires little installation space, and is convenient for installation and deployment in narrow or space-limited places.

[0045] In one embodiment, see Figure 1 The connector 7 has a groove 701 at one end facing the bracket 3, and the through hole 11 on the connector 7 communicates with the groove 701. The watertight optical cable splice also includes an inner ferrule assembly 8, which is disposed in the groove 701 and connected to the through hole 11 on the connector 7 to detachably fix and seal the optical fiber core in the inserted optical cable to the through hole 11. Since the outer ferrule assembly 1 connected to the bracket 3 is pre-installed with the bracket 3 instead of being installed on-site, its sealing performance has been tested. However, the connection between the outer ferrule assembly 1 and the connector 7 is installed on-site. To ensure the sealing performance at this point, an inner ferrule assembly 8 is set inside the connector 7 to hold the optical fiber core of the optical cable, adding a layer of sealing and improving the sealing performance during on-site assembly. This allows it to adapt to various scenarios with high watertightness requirements.

[0046] In the above embodiments, preferably, see [reference needed]. Figure 4The inner ferrule assembly 8 includes an inner ferrule kit 102, a first nut 802, a first ferrule holder 804, and a second ferrule holder 803. One end of the inner ferrule kit 102 extends into the through hole 11 on the connector 7 and is threadedly connected thereto. A seal is formed between the inner ferrule kit 102 and the bracket 3. The inner ferrule kit 102 has a fourth through hole that allows the optical fiber core to pass through. The first nut 802 is fitted onto the other end of the inner ferrule kit 102 and is threadedly connected thereto. The first ferrule holder 804 and the second ferrule holder 803 are arranged sequentially between the first nut 802 and the inner ferrule kit 102 along a direction away from the through hole 11, and each of them has a fifth through hole that allows the optical fiber core to pass through. When the first nut 802 and the inner ferrule kit 102 are in the connected state, the second ferrule holder 803 and the first ferrule holder 804 are squeezed by the first nut 802 to seal and fix the inner ferrule kit 102 and the inserted optical fiber core in a clamping manner.

[0047] Specifically, the first ferrule holder 804 has a conical structure, with a first conical hole and a first clamping hole communicating with each other. The second ferrule holder 803 has a cylindrical structure, with a second clamping hole. One end of the outer wall of the second ferrule holder 803 is set as a conical surface that mates with the first conical hole. The other end of the inner ferrule assembly 102 has a conical surface that mates with the conical surface of the first ferrule holder 804. The first nut 802 has a stepped hole structure inside, which not only achieves the connection between the first nut 802 and the inner ferrule assembly 102, but also allows the first nut 802 to squeeze the second ferrule holder 803 during screwing in. After being squeezed, the second ferrule holder 803 begins to squeeze the first ferrule holder 804. Both the first ferrule holder 804 and the second ferrule holder 803 deform due to the squeezing, thus sealing the inner ferrule assembly 102 with the inserted optical fiber core and fixing the optical fiber core in a clamping manner, preventing it from moving.

[0048] In the above embodiment, the inner card kit 102 includes a first connector section, a first transition section, and a second connector section. The first connector section is connected to the second connector section through the first transition section and is an integral structure. The first connector section is threadedly connected to the first nut 802. A tapered surface is provided on the inner wall of one end of the first connector section. The second connector section is threadedly connected to the through hole 11. When the second connector 7 and the through hole 11 are in a threaded connection state, a third sealing ring is provided between the first transition section and the inner wall of the groove 701 to seal the through hole 11 and the groove 701.

[0049] In the above embodiments, preferably, see [reference needed]. Figure 5The outer card sleeve assembly 1 includes an outer card sleeve 801, a second nut 101, a third card sleeve seat 104, and a fourth card sleeve seat 103. One end of the outer card sleeve 801 extends into the corresponding through hole 11 and is threadedly connected thereto. A seal is formed between the outer card sleeve 801 and the corresponding connector 7 or bracket 3. The outer card sleeve 801 is provided with a sixth through hole for the optical cable to pass through. The second nut 101 is sleeved on the other end of the outer card sleeve 801 and is threadedly connected thereto. The third card sleeve seat 104 and the fourth card sleeve seat 103 are arranged sequentially between the second nut 101 and the outer card sleeve 801 along a direction away from the through hole 11, and each of them is provided with a seventh through hole for the optical fiber core to pass through. When the second nut 101 and the outer card sleeve 801 are in the connected state, the fourth card sleeve seat 103 and the third card sleeve seat 104 are squeezed by the nut to seal and fix the outer card sleeve 801 and the inserted optical cable in a clamping manner.

[0050] Specifically, the third retaining sleeve 104 has a conical structure, and a second conical hole and a third clamping hole are provided inside the third retaining sleeve 104. The fourth retaining sleeve 103 has a cylindrical structure, and a fourth clamping hole is provided on the fourth retaining sleeve 103. One end of the outer wall surface of the fourth retaining sleeve 103 is set as a conical surface that mates with the second conical hole. The other end of the outer retaining sleeve 801 has a conical surface that mates with the conical surface of the third retaining sleeve 104. The second nut 101 has a stepped hole structure inside. This not only realizes the connection between the second nut 101 and the outer retaining sleeve 801, but also allows the second nut 101 to squeeze the fourth retaining sleeve 103 during the screwing process. After being squeezed, the fourth retaining sleeve 103 begins to squeeze the third retaining sleeve 104. Both the third retaining sleeve 104 and the fourth retaining sleeve 103 deform due to the squeezing, thereby sealing the outer retaining sleeve 801 with the inserted optical cable and fixing the optical cable in a clamping manner, making it unable to move.

[0051] In the above embodiment, the outer card kit 801 includes a third connector section, a second transition section and a fourth connector section. The third connector section is connected to the fourth connector section through the second transition section and is an integral structure. The third connector section is threadedly connected to the second nut 101. A tapered surface is provided on the inner wall of one end of the third connector section. The fourth connector section is threadedly connected to the inlet hole 11. When the fourth connector 7 and the inlet hole 11 are in a threaded connection state, a fourth sealing ring is provided between the second transition section and the first connector section 301 to seal the inlet hole 11 from the outside.

[0052] In the above embodiments, the outer ferrule assembly seals the optical cable and the access hole by compression and clamping, while the bracket and connector are sealed with a sealing ring to the access hole. The cooperation of these two components improves the sealing reliability and effectively prevents external fluids (liquid or gas) from entering the sleeve, ensuring the long-term stable operation of the optical cable connection point. The outer ferrule assembly, inner ferrule assembly, and the connection between the connector and the sleeve are all threaded, allowing the optical cable to be connected on-site without the need for professional tools, making the operation simpler and more convenient.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A watertight optical cable splicing device, characterized in that, The device includes a bracket, a sleeve, a connector, and an outer clamping assembly. The sleeve has a first through hole and a second through hole that are interconnected. A step is formed at the connection between the first through hole and the second through hole. The bracket passes through the first through hole and the second through hole. One end of the sleeve is detachably and fixedly connected to the connector. One end of the connector extends into the sleeve to abut against the bracket, and the bracket is locked in the sleeve by the step. A seal is formed between one end of the bracket and the sleeve, and a seal is formed between the connector and the sleeve. An optical fiber adapter is detachably and fixedly connected to the bracket inside the sleeve. One end of the bracket and the other end of the connector are provided with an inlet hole for inserting an optical cable to connect with the optical fiber adapter. The inlet hole is connected to an outer clamping assembly to detachably fix and seal the inserted optical cable to the inlet hole.

2. The watertight optical cable splicing device according to claim 1, characterized in that, The bracket includes a first connecting section, a middle section, and a second connecting section. One end of the first connecting section is fixedly connected to one end of the second connecting section through the middle section. The first connecting section has an inlet hole, and the other end of the first connecting section passes through the first inlet hole and forms a seal with the first inlet hole. A protrusion that mates with a step is fixed on the outer wall of the first connecting section. The fiber optic adapter is installed on the middle section. The second connecting section is located in the second inlet hole and has a third inlet hole. One end of the middle section has a first opening communicating with the inlet hole, and the other end of the middle section has a second opening communicating with the third inlet hole. When one end of the connector is in abutting state with the second connecting section, the protrusion abuts against the step.

3. The watertight optical cable splicing device according to claim 2, characterized in that, Both the first and second connecting segments are cylindrical structures, while the middle segment is a flat plate structure with stepped holes. The fiber optic adapter passes through the stepped holes and is detachably and fixedly connected to the middle segment via fasteners.

4. The watertight optical cable splicing device according to claim 2, characterized in that, The second connecting section is provided with a plurality of slots arranged in a circular pattern. One end of the connector is fixed with a plug that is the same number as the number of slots and corresponds one-to-one. When the connector and the sleeve are in the connected state, the plug is inserted into the corresponding slot and exerts a squeezing force on it to make the bracket lock in the sleeve.

5. The watertight optical cable splicing device according to claim 1, characterized in that, One end of the sleeve is threaded to the connector, and the sleeve and the connector are further fixed by a fastening screw, the center line of which is perpendicular to the center line of the sleeve.

6. The watertight optical cable splicing device according to claim 2, characterized in that, The first connecting segment is fitted with at least two spaced first sealing rings to form a seal with the first through hole, and the outer wall of the connector is fitted with at least two spaced second sealing rings to form a seal with the second through hole.

7. The watertight optical cable splicing device according to claim 1, characterized in that, The connector has a groove at one end facing the bracket, and the inlet hole on the connector communicates with the groove. The watertight optical cable splicing device also includes an inner ferrule assembly, which is disposed in the groove and connected to the inlet hole on the connector to detachably fix and seal the optical fiber core wire in the inserted optical cable with the inlet hole.

8. The watertight optical cable splicing device according to claim 7, characterized in that, The inner ferrule assembly includes an inner ferrule kit, a first nut, a first ferrule holder, and a second ferrule holder. One end of the inner ferrule kit extends into the inlet hole of the connector and is threaded to it, forming a seal between the inner ferrule kit and the bracket. The inner ferrule kit has a fourth through hole that allows the optical fiber core to pass through. The first nut is fitted onto the other end of the inner ferrule kit and is threaded to it. The first ferrule holder and the second ferrule holder are sequentially arranged between the first nut and the inner ferrule kit along a direction away from the inlet hole, and each has a fifth through hole that allows the optical fiber core to pass through. When the first nut and the inner ferrule kit are in the connected state, the second ferrule holder and the first ferrule holder are squeezed by the first nut to seal and fix the inner ferrule kit and the inserted optical fiber core in a clamping manner.

9. The watertight optical cable splicing device according to claim 8, characterized in that, The first ferrule holder is a conical structure, and has a conical hole and a first clamping hole that are interconnected inside. The second ferrule holder is a cylindrical structure, and has a second clamping hole. One end of the outer wall of the second ferrule holder is set as a conical surface that mates with the conical hole. The other end of the inner ferrule set has a conical surface that mates with the conical surface of the first ferrule holder.

10. The watertight optical cable splicing device according to claim 1, characterized in that, The outer ferrule assembly includes an outer ferrule kit, a second nut, a third ferrule holder, and a fourth ferrule holder. One end of the outer ferrule kit extends into the corresponding through hole and is threaded to it, and a seal is formed between the outer ferrule kit and the corresponding connector or bracket. The outer ferrule kit has a sixth through hole for the optical cable to pass through. The second nut is fitted onto the other end of the outer ferrule kit and is threaded to it. The third and fourth ferrule holders are sequentially arranged between the second nut and the outer ferrule kit along a direction away from the through hole, and each has a seventh through hole for the optical fiber core to pass through. When the second nut and the outer ferrule kit are in the connected state, the fourth and third ferrule holders are squeezed by the nut to seal and fix the outer ferrule kit and the inserted optical cable in a clamping manner.

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