Fixed connection structure of optical fiber connector and optical cable

Abstract

The invention relates to the technical field of optical communication components, and discloses a fixed connection structure of an optical fiber connector and an optical cable, which comprises an inner shell, a fixed block, a screw and a rear nut, the side wall of the inner shell is provided with a clamping groove extending along the axial direction, the side surface of the fixed block is provided with the screw, and the head of the screw extends into the clamping groove and forms mechanical interference fit with the side wall. Therefore, circumferential rotation of the fixing block relative to the inner shell is effectively limited, and the axial position of the fixing block is locked. In addition, a limiting groove and an external thread are preset at the end part of the fixing block, a tensile piece in the optical cable penetrates through the auxiliary hole, is bent and embedded into the limiting groove and is tightly attached to the surface of the thread, and the tensile piece is firmly locked in a thread gap in cooperation with the screwing action of a rear nut. Meanwhile, a rubber ring is arranged outside the rear nut to abut against the inner wall of the connector body. According to the invention, high tensile strength of optical cable connection is ensured, torsion damage during assembly is avoided, and the sealing waterproof performance and operation reliability of the whole structure are improved.

Description

Technical Field

[0001] This invention relates to the field of optical communication component technology, specifically to a fixed connection structure between an optical fiber connector and an optical cable. Background Technology

[0002] With the rapid development of optical fiber communication technology, optical fiber connectors, as indispensable passive devices in optical transmission networks, are widely used in optical fiber distribution frames, optical transceivers, and various testing instruments. The stability of their connection with optical cables directly affects the quality of optical signal transmission and the reliability of the network. In existing optical fiber connector assembly technology, to ensure the stability of the optical cable within the connector, it is usually necessary to lock and secure the optical cable using a nut or crimp ring at the end.

[0003] However, existing fiber optic connector and cable fixing structures still have significant shortcomings in practical applications, mainly in terms of protection during assembly and tensile strength after tightening. Specifically, during the tightening of the tail nut to fix the cable, due to the lack of an effective circumferential anti-rotation structure between the internal fixing components and the outer shell, the internal components are often driven by the frictional torque generated by the thread engagement to rotate relative to the outer shell. This rotation can directly cause the fragile optical fibers running through them to twist, deform, or even break, resulting in severe optical loss or signal interruption. At the same time, existing tensile structures mostly use a simple planar crimping method to fix the aramid or steel wires inside the cable. This method not only makes it difficult to fix the tensile components evenly, but also makes it easy for the tensile components to slip off the crimping interface when the cable is subjected to strong axial tension, causing the cable to be pulled out. In addition, traditional structures often lack targeted sealing designs at the tail connection, making the connector interior susceptible to corrosion from external moisture and dust, making it difficult to meet the requirements for long-term stable use in complex and harsh environments. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a fixed connection structure for fiber optic connectors and optical cables, which solves the problems of fiber optic connectors suffering torsional damage due to internal components rotating during assembly and locking, and optical cables having insufficient tensile strength and being prone to slippage due to simple fixing methods for tensile components.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a fixed connection structure for an optical fiber connector and an optical cable, comprising an optical fiber connector body and an optical cable, characterized in that an inner shell is provided inside the optical fiber connector body, a fixing block is provided on the inner side of the inner shell, a rear nut is threadedly connected to the end of the fixing block, the optical cable passes through an auxiliary hole at the axis of the fixing block, a tensile member inside the optical cable passes through a limiting groove on the end face of the fixing block and extends to the threaded connection between the fixing block and the rear nut, the rear nut is tightened onto the fixing block and clamps and fixes the tensile member between the fixing block and the rear nut.

[0006] Preferably, the inner shell sidewall has an axially extending slot, and the fixing block is connected to a screw on its side. The screw head extends into the slot and engages with the slot sidewall to restrict the fixing block from rotating relative to the inner shell.

[0007] Preferably, the side wall of the fixing block is provided with a mounting hole, the screw is threaded into the mounting hole, and the screw head protrudes from the outer surface of the fixing block.

[0008] Preferably, the limiting groove is formed outside the fixing block, and the tensile member passes through the auxiliary hole, bends into the limiting groove, and fits against the outer surface of the fixing block.

[0009] Preferably, the end of the fixing block connected to the rear nut has an external thread, the rear nut has an internal thread, the tensile member is wound around the surface of the external thread, and the rear nut locks the tensile member by engaging the internal thread with the external thread.

[0010] Preferably, an annular groove is formed on the outer circumferential surface of the rear nut, and a rubber ring is installed in the annular groove, with the outer wall of the rubber ring abutting against the inner wall of the fiber optic connector body.

[0011] Preferably, the tensile member is an aramid fiber bundle or a steel wire rope, and the tensile member is located inside the outer sheath layer of the optical cable.

[0012] Preferably, the auxiliary hole extends through the entire fixing block, and the diameter of the auxiliary hole is adapted to the diameter of the optical cable after the outer sheath is removed.

[0013] Preferably, the length of the slot along the axial direction of the inner shell is adapted to the diameter of the screw head, the screw is embedded in the slot, and the screw locks the axial position of the fixing block relative to the inner shell.

[0014] Preferably, the rear nut is a hollow tubular structure, and the optical cable passes sequentially through the interior of the rear nut and the auxiliary hole of the fixing block.

[0015] This invention provides a fixed connection structure between an optical fiber connector and an optical cable. It has the following advantages: 1. This invention guides the tensile member to bend and fit into the threaded area by setting a limiting groove at the end of the fixed block. The mechanical biting force generated by tightening the nut after the tensile member is tightened and fixed in the threaded gap, thereby effectively transferring the external tensile force on the optical cable directly to the mechanical structure. This achieves high-strength physical tensile locking between the optical cable and the connector, avoiding the problem of internal optical fiber breakage or signal transmission interruption caused by external pulling. 2. The present invention forms a rigid mechanical interference fit by embedding the screw head fixed to the side wall of the fixing block into the axial groove of the inner shell. This not only effectively overcomes the tendency of the fixing block to follow the rotation during the assembly process after tightening the nut to prevent torsional damage to the internal optical fiber, but also locks the position of the fixing block by the axial limiting effect of the screw on the end wall of the groove, thus ensuring the installation accuracy and stability of the overall structure. 3. This invention embeds a rubber ring on the outer circumference of the rear nut. The elastic deformation of the rubber ring under pressure causes its outer wall to tightly abut against the inner wall of the fiber optic connector body. While completing the mechanical locking of the fiber optic cable tail, it automatically fills the assembly gap between components, building a reliable sealing barrier, blocking the intrusion of external moisture and dust, and improving the protection performance and service life of the fiber optic connector in harsh environments. Attached Figure Description

[0016] Figure 1 This is a perspective view of the present invention; Figure 2 This is a cross-sectional schematic diagram of the present invention; Figure 3 This is a schematic diagram of the rear nut of the present invention; Figure 4 This is an exploded view of the present invention.

[0017] The components include: 1. Fiber optic connector body; 2. Inner shell; 3. Slot; 4. Screw; 5. Fixing block; 6. Rear nut; 7. Optical cable; 8. Rubber ring; 9. Limiting groove; 10. Auxiliary hole. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see the appendix Figure 1 - Appendix Figure 3This invention provides a fixed connection structure for an optical fiber connector and an optical cable, including an optical fiber connector body 1 and an optical cable 7. The invention constructs an installation environment supported by an inner shell 2 inside the optical fiber connector body 1 to stably accommodate a fixing block 5. The fixing block 5 serves as the core load-bearing component, and the optical cable 7 is precisely guided and positioned through an auxiliary hole 10 in its center. The tensile member dissected inside the optical cable 7 is then combed out through the limiting groove 9 at the end of the fixing block 5 and folded back to fit the threaded connection area. Subsequently, by using the action of screwing the rear nut 6 onto the end of the fixing block 5, the mechanical biting force generated by the thread engagement forces the mating surface of the rear nut 6 and the fixing block 5 to forcefully clamp the tensile member located therebetween. This eliminates the risk of the optical cable 7 slipping due to tension and ensures the long-term reliability of the overall connection structure through a purely physical mechanical locking method.

[0020] Please see the appendix Figure 1 and attached Figure 2 In a preferred embodiment of the present invention, a groove 3 extending axially is provided on the side wall of the inner shell 2 as an anti-rotation mating space. The head of the screw 4 fixed to the side of the fixing block 5 is embedded in the groove 3 to form mechanical interference. Then, with the rigid abutment between the screw 4 and the side wall of the groove 3, the circumferential rotation tendency of the fixing block 5 relative to the inner shell 2 is effectively overcome when the fixing block 5 is subjected to rotational torque, thereby ensuring the posture stability of the fixing block 5 during assembly and use.

[0021] Please see the appendix Figure 2 and attached Figure 3 In a preferred embodiment of the present invention, by opening a mounting hole in the side wall of the fixing block 5 to accommodate the screw 4 being screwed in, the fastening force of the threaded connection ensures the integrity of the screw 4 and the fixing block 5, and the head of the screw 4 protrudes from the outer surface of the fixing block 5 to form a rigid positioning protrusion, thereby providing the necessary mechanical interference structure for subsequent insertion into the slot to restrict the rotation of the fixing block 5.

[0022] Please see the appendix Figure 2 - Appendix Figure 4 In a preferred embodiment of the present invention, by opening a limiting groove 9 on the outside of the fixing block 5 to precisely guide the laying path of the tensile member, the tensile member passing through the auxiliary hole 10 is guided to bend and deform and then be embedded into the limiting groove 9, thereby forcing the tensile member to fit tightly against the outer surface of the fixing block 5 to form a stable covering layer, thereby preventing the tensile member from being scattered during the assembly process and ensuring that it is in the optimal locked position.

[0023] Please see the appendix Figure 3 and attached Figure 4In a preferred embodiment of the present invention, by pre-drilling external threads at the connecting end of the fixing block 5 to support the tensile member wound thereon, the internal thread of the rear nut 6 and the external thread are rotated together, and the mechanical biting force generated during the thread engagement process is directly applied to the tensile member located at the thread gap, thereby forcefully squeezing and locking the tensile member between the thread engagement surfaces of the fixing block 5 and the rear nut 6 to prevent it from slipping out under force.

[0024] Please see the appendix Figure 3 and attached Figure 4 In a preferred embodiment of the present invention, an annular groove is opened on the outer circumferential surface of the rear nut 6 to securely support the rubber ring 8. The elastic deformation capability of the rubber ring 8 itself is used to make its outer wall tightly abut against the inner wall of the fiber optic connector body 1, thereby effectively filling the assembly gap between the two when the rear nut 6 is inserted into the fiber optic connector body 1, and building a tight sealing barrier to prevent the intrusion of external moisture and dust.

[0025] Please see the appendix Figure 1 - Appendix Figure 4 In a preferred embodiment of the present invention, a high-strength aramid fiber bundle or steel wire rope is selected as a tensile member built into the outer sheath of the optical cable 7. This tensile member serves as the main skeleton structure for bearing axial tensile force in the optical cable 7. After extending out of the outer sheath, it can act as a clamped force-bearing entity to cooperate with the fixing structure, thereby effectively transmitting the external tensile force acting on the optical cable 7 to the optical fiber connector body to protect the internal optical fiber from damage.

[0026] Please see the appendix Figure 1 - Appendix Figure 4 In a preferred embodiment of the present invention, an internal channel for the optical cable 7 to pass smoothly is constructed by setting an auxiliary hole 10 that penetrates the entire fixing block 5. The radial gap between the two is effectively eliminated by utilizing the precise fit between the diameter of the auxiliary hole 10 and the diameter of the optical cable 7 after the outer sheath is removed, thereby limiting the shaking or deviation of the optical cable 7 during the process of passing through the fixing block 5, thus ensuring that the optical cable 7 can extend accurately and stably along the central axis to the subsequent locking area.

[0027] Please see the appendix Figure 1 - Appendix Figure 3 In a preferred embodiment of the present invention, by setting the length of the slot 3 along the axial direction of the inner shell 2 to match the diameter of the screw head 4, the screw head 4 embedded in the slot 3 is tightly limited in the axial direction by the side walls at both ends of the slot 3. The tight fit between the screw 4 and the slot 3 eliminates the axial play gap between them, thereby rigidly locking the axial position of the fixing block 5 relative to the inner shell 2 to prevent axial displacement during installation or use.

[0028] Please see the appendix Figure 2- Appendix Figure 4 In a preferred embodiment of the present invention, the rear nut 6 is designed as a hollow tubular structure to create an internal channel for the optical cable 7 to pass through smoothly. The optical cable 7 is guided through the interior of the rear nut 6 and the auxiliary hole 10 of the fixing block 5 in sequence according to the assembly logic. This ensures that the rear nut 6 can be screwed into the fixing block 5 to perform the locking action, while providing the optical cable 7 with an axial extension space that does not interfere with each other to complete the assembly and connection of the overall structure.

[0029] Working Principle: During assembly and operation, the optical cable 7 is first guided through the hollow tubular rear nut 6 and out through the auxiliary hole 10 at the center of the fixing block 5. The auxiliary hole 10 is used to radially limit and guide the optical cable 7 after the outer sheath has been removed. Then, the separated aramid fiber bundles or steel wire rope tensile components are bent, combed, and tightly wrapped around the threaded end surface of the fixing block 5 via the limiting groove 9 at the end of the fixing block 5. The rear nut 6 is then tightened. The strong clamping force generated by the mechanical engagement of the internal thread of the rear nut 6 and the external thread of the fixing block 5 firmly clamps and fixes the tensile components to the two components. To prevent the optical cable 7 from slipping due to tension, the screw 4, which is screwed into the mounting hole on the side wall of the fixing block 5 and has a protruding head, is precisely embedded in the slot 3 extending axially on the side wall of the inner shell 2. Through the rigid contact between the head of the screw 4 and the side wall and end of the slot 3, the circumferential rotation of the fixing block 5 relative to the inner shell 2 is effectively restricted and its axial position is locked. Finally, the rubber ring 8, which is embedded in the annular groove on the outer circumference of the rear nut 6, is compressed and undergoes elastic deformation, and tightly abuts against the inner wall of the fiber optic connector body 1. This ensures the stability of the mechanical connection while achieving a sealed protection for the internal environment of the fiber optic connector body 1.

Claims

1. A fixed connection structure between an optical fiber connector and an optical cable, comprising an optical fiber connector body (1) and an optical cable (7), characterized in that, The fiber optic connector body (1) has an inner shell (2) inside. A fixing block (5) is provided on the inner side of the inner shell (2). A rear nut (6) is threaded to the end of the fixing block (5). The optical cable (7) passes through the auxiliary hole (10) at the axis of the fixing block (5). The tensile member inside the optical cable (7) passes through the limiting groove (9) on the end face of the fixing block (5) and extends to the threaded connection between the fixing block (5) and the rear nut (6). The rear nut (6) is tightened on the fixing block (5) and clamps and fixes the tensile member between the fixing block (5) and the rear nut (6).

2. The fixed connection structure between an optical fiber connector and an optical cable according to claim 1, characterized in that, The inner shell (2) has a slot (3) extending axially on its side wall. The fixing block (5) is connected to a screw (4) on its side. The head of the screw (4) extends into the slot (3) and engages with the side wall of the slot (3) to restrict the fixing block (5) from rotating relative to the inner shell (2).

3. The fixed connection structure between an optical fiber connector and an optical cable according to claim 2, characterized in that, The fixing block (5) has mounting holes on its side wall, and the screw (4) is threaded into the mounting holes. The head of the screw (4) protrudes from the outer surface of the fixing block (5).

4. The fixed connection structure between an optical fiber connector and an optical cable according to claim 1, characterized in that, The limiting groove (9) is opened outside the fixing block (5). The tensile member passes through the auxiliary hole (10), bends into the limiting groove (9), and fits against the outer surface of the fixing block (5).

5. The fixed connection structure between an optical fiber connector and an optical cable according to claim 1, characterized in that, The fixed block (5) is connected to the rear nut (6) at one end with an external thread, and the rear nut (6) is provided with an internal thread. The tensile member is wound around the surface of the external thread, and the rear nut (6) locks the tensile member by engaging the internal thread with the external thread.

6. The fixed connection structure between an optical fiber connector and an optical cable according to claim 1, characterized in that, The outer circumferential surface of the rear nut (6) has an annular groove, and a rubber ring (8) is installed in the annular groove. The outer wall of the rubber ring (8) abuts against the inner wall of the fiber optic connector body (1).

7. The fixed connection structure between an optical fiber connector and an optical cable according to claim 1, characterized in that, The tensile member is an aramid fiber bundle or a steel wire rope, and the tensile member is located inside the outer sheath layer of the optical cable (7).

8. The fixed connection structure between an optical fiber connector and an optical cable according to claim 1, characterized in that, The auxiliary hole (10) penetrates the entire fixed block (5), and the diameter of the auxiliary hole (10) is adapted to the diameter of the optical cable (7) after the outer sheath is removed.

9. The fixed connection structure between an optical fiber connector and an optical cable according to claim 2, characterized in that, The length of the slot (3) along the axial direction of the inner shell (2) is adapted to the diameter of the head of the screw (4). The screw (4) is embedded in the slot (3) and locks the axial position of the fixing block (5) relative to the inner shell (2).

10. The fixed connection structure between an optical fiber connector and an optical cable according to claim 1, characterized in that, The rear nut (6) is a hollow tubular structure, and the optical cable (7) passes through the interior of the rear nut (6) and the auxiliary hole (10) of the fixing block (5) in sequence.

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