High-density small round quick-plug fiber connector

Abstract

The high-density small round type quick plug-pull optical fiber connector comprises a plug assembly and a socket assembly, wherein the plug assembly comprises a locking key capable of relative rotation, and the inner wall of a through hole on the locking key is provided with an inclined surface, and the two ends of the inclined surface are respectively formed with a first groove and a second groove; a fastening screw of the plug assembly extends into the through hole; the inside of the socket assembly is provided with an interface sealing ring, and the socket assembly is provided with a locking groove; in the process of inserting the plug assembly into the socket assembly, the fastening screw is initially positioned in the first groove to limit the rotation of the locking key; when the plug assembly is inserted into contact with the interface sealing ring and makes it deformed, the fastening screw is driven to be separated from the first groove and slides into the second groove along the inclined surface; the fastening screw releases the rotation freedom of the locking key in the process of sliding into the second groove, the locking key and the locking groove form a clamping locking fit, and the fastening screw is positioned in the second groove. The application discards the traditional clamping jaw, reduces the cost and failure risk, and realizes single-hand quick plug-pull.

Description

Technical Field

[0001] This invention relates to the technical field of fiber optic connectors and related technologies, and in particular to a high-density small circular quick-plug fiber optic connector. Background Technology

[0002] Currently available quick-plug decoupled fiber optic connectors mainly suffer from the following problems: 1. Existing quick-plug structures mostly use claw structures. However, this structure requires high precision and heat treatment, which leads to a decrease in the pass rate. Furthermore, there are obvious stress concentration points at the claws, making them prone to fatigue failure and breakage after repeated plugging and unplugging, and even generating metal shavings that contaminate the optical path. 2. Existing products are cumbersome to plug and unplug. Insertion and removal typically require holding different parts of the connector (e.g., pushing one end in while pressing or pulling the claw at the other end), making single-handed operation extremely inconvenient and affecting plugging and unplugging efficiency. 3. To ensure elasticity, existing claw structures must use highly elastic metals such as beryllium copper for precision machining. These materials are expensive and difficult to manufacture, resulting in high unit costs. 4. Existing optical connectors mostly use traditional ceramic ferrules or MT ferrules. Ceramic ferrules are limited by their low structural density, making it difficult to meet the requirements of high-density transmission; while MT ferrules have a short plugging and unplugging lifespan. Both types of ferrules are extremely sensitive to dust in the operating environment, easily leading to end-face contamination and decreased optical performance. Summary of the Invention

[0003] In view of this, and to solve the above problems, the purpose of this invention is to provide a high-density small circular quick-plug fiber optic connector, comprising: Plug assembly, socket assembly; The plug assembly includes a locking key that is rotatable relative to the plug, and the locking key has at least one through hole. The inner wall of the through hole has an inclined surface, and a first groove and a second groove are formed at both ends of the inclined surface. The plug assembly also includes a set screw that extends into the through hole. The socket assembly has an interface sealing ring installed inside, and a locking groove is provided on the socket assembly; During the insertion of the plug assembly into the socket assembly, the set screw is initially positioned in the first groove to restrict the rotation of the locking key; when the plug assembly is inserted to contact the interface sealing ring and deform it, the set screw is driven to disengage from the first groove and slide into the second groove along the inclined surface. As the set screw slides into the second groove, it releases the rotational freedom of the locking key, and the locking key forms a snap-fit ​​locking engagement with the locking groove; and the set screw is positioned in the second groove to maintain the snap-fit ​​locking engagement between the plug assembly and the socket assembly.

[0004] The aforementioned high-density small circular quick-plug fiber optic connector further includes the following components: a plug housing, a plug inner housing, a limiting ring, a locking sleeve, springs, and an EBO expander ferrule; the plug inner housing is installed inside the plug housing, the locking key is rotatably installed on the outer wall of the plug housing, one end of each of the two springs is connected to the plug housing, and the other end is connected to the locking key; the limiting ring is sleeved on the locking key and the outer wall of the plug housing to limit the springs; the locking sleeve is slidably sleeved on the outer wall of the limiting ring and the locking key; the locking sleeve has a threaded hole, and the set screw passes through the threaded hole and extends into the through hole to engage with the first groove or the second groove; the EBO expander ferrule is fixedly installed in the plug inner housing. The socket assembly further includes: a socket outer shell, a socket inner shell, a limiting block, a tail shell, a branch seat, and a socket EBO expansion socket; the socket inner shell is installed inside the socket outer shell, the limiting block is sleeved on the socket inner shell, the socket outer shell and the branch seat are respectively installed at both ends of the tail shell, and the socket EBO expansion socket is installed in the socket inner shell.

[0005] The aforementioned high-density small circular quick-plug fiber optic connector has a first outer circumferential surface and a second outer circumferential surface connected in sequence on the outer wall of the plug housing. The diameter of the first outer circumferential surface is larger than that of the second outer circumferential surface. Two axial limiting grooves are formed on the outer wall of the second outer circumferential surface. The two limiting grooves extend circumferentially along the second outer circumferential surface on the side closest to the first outer circumferential surface to form a clearance groove.

[0006] The aforementioned high-density small circular quick-plug fiber optic connector includes a locking key comprising a locking ring and two cantilever arms. The two cantilever arms extend axially from the inner wall of the locking ring, and a through hole is formed at one end of each cantilever arm away from the locking ring. A boss is provided at one end of each cantilever arm located inside the locking ring. The locking ring is sleeved on the second outer circumferential surface, and a limiting ring is sleeved on both cantilever arms and the second outer circumferential surface. The two cantilever arms are disposed within two limiting grooves, and the two bosses can be engaged in two clearance grooves. Fixing holes are provided on the two bosses, and corresponding protrusions are provided on the inner walls of the two limiting grooves. Mounting grooves are formed on the protrusions, and the two ends of the two springs are respectively fixed to the fixing holes and the mounting grooves.

[0007] In the aforementioned high-density small circular quick-plug fiber optic connector, the outer wall of the second outer circumferential surface is provided with two guide grooves, and the inner wall of the locking sleeve is provided with two guide keys. The locking sleeve can slide axially on the outer wall of the second outer circumferential surface through the two guide keys and the two guide grooves.

[0008] In the aforementioned high-density small circular quick-plug fiber optic connector, the outer wall of the locking ring is provided with a locking key, and the outer wall of the first outer circumferential surface is provided with a positioning key.

[0009] In the aforementioned high-density small circular quick-plug fiber optic connector, the inner wall of the socket housing has an axial guide keyway and a circumferentially arranged locking groove, the guide keyway and the locking groove being connected; the inner wall of the socket housing has a stepped surface, and the interface sealing ring is installed on the side of the stepped surface facing the guide keyway; when the plug housing is inserted into the socket housing, the positioning key cooperates with the guide keyway to achieve radial positioning, wherein the front end face of the plug housing contacts the interface sealing ring, and when the front end face of the plug housing contacts the interface sealing ring and deforms it, the locking key slides into the locking groove through the guide keyway and achieves locking and limiting under the drive of the coil spring.

[0010] The aforementioned high-density small circular quick-plug fiber optic connector has a fiber optic cable fixing structure at the end of the plug housing away from the socket housing.

[0011] The aforementioned high-density small circular quick-plug fiber optic connector includes an optical cable fixing structure comprising: a crimping liner, a crimping ring, a tail end housing, a tail cap, a sealing ring, and an optical cable reinforcing rib; the crimping liner is threadedly connected to the plug housing, and the optical cable reinforcing rib is clamped between the outer wall of the crimping liner and the crimping ring and fixed by crimping; the tail end housing is threadedly connected to the crimping liner, the tail cap is threadedly connected to the tail end housing, and the sealing ring is pressed between the tail cap and the tail end housing.

[0012] In the aforementioned high-density small circular quick-plug fiber optic connector, both the plug EBO expansion ferrule and the socket EBO expansion ferrule are provided with fiber optic guide slots, and the fiber optic cable passes through the fiber optic guide slots and is cured with adhesive.

[0013] The positive effects of the above technical solution compared with the existing technology are: 1. Abandoning traditional chucks to reduce costs and failure risks: The traditional beryllium copper chuck structure is replaced by a locking key structure with a wire spring providing the reset force and a set screw and groove engagement. This completely eliminates the stress concentration and breakage / chipping risks caused by the chucks, while significantly reducing the procurement and processing costs of high-elasticity materials.

[0014] 2. Enables quick one-handed insertion and removal: Through the ingenious design of the locking sleeve, inclined surface, and groove, the interface sealing ring's reaction force during insertion automatically completes the sliding and locking (self-locking), and the pulling force during removal automatically completes the sliding and unlocking. The operator only needs to hold the locking sleeve with one hand to complete the "push-in locking" and "pull-out unlocking" processes, greatly improving the operating experience and insertion and removal efficiency.

[0015] 3. EBO expanded ferrule is used to improve high density and dust resistance: Using EBO expanded ferrule to replace traditional ceramic ferrule or MT ferrule not only meets the needs of high-density fiber optic transmission, but also greatly improves the insertion and removal life. In addition, the expanded ferrule characteristics make it less sensitive to environmental pollutants such as dust, thus improving the stability of the optical path in complex environments.

[0016] 4. Double insurance in locking state, high connection reliability: When the set screw is in the locked or unlocked state, it is stably engaged in the corresponding first or second groove. With the help of the spring force, it ensures that the connector will not mislock when subjected to vibration or accidental contact, thus guaranteeing the absolute stability of the optical link. Attached Figure Description

[0017] Figure 1 This is an exploded view of the plug assembly of a high-density small circular quick-plug fiber optic connector according to the present invention.

[0018] Figure 2 This is an exploded view of the socket assembly of a high-density small circular quick-plug fiber optic connector according to the present invention.

[0019] Figure 3 This is a schematic diagram of the plug housing in this invention.

[0020] Figure 4 This is a schematic diagram of the locking key in this invention.

[0021] Figure 5 This is a perspective view of the locking key in this invention.

[0022] Figure 6 This is a schematic diagram of the locking sleeve in this invention.

[0023] Figure 7 This is an assembly diagram of the socket assembly in this invention.

[0024] Figure 8 This is a schematic diagram of the socket housing in this invention.

[0025] Figure 9 This is an assembly diagram of the plug assembly and optical cable fixing structure in this invention.

[0026] Figure 10 This is a schematic diagram of the mating of the plug assembly of a high-density small circular quick-plug fiber optic connector according to the present invention.

[0027] Figure 11 This is a schematic diagram of the press-fit liner in this invention.

[0028] Figure 12 This is a schematic diagram of the tail end housing in this invention.

[0029] Figure 13 This is a schematic diagram of the tail cap in this invention.

[0030] 1. Plug assembly; 2. Plug housing; 210. First outer circumferential surface; 211. Positioning key; 220. Second outer circumferential surface; 221. Limiting groove; 222. Clearance groove; 223. Protrusion; 224. Mounting groove; 225. Guide groove; 226. External thread; 3. Plug inner housing; 4. Locking key; 41. Locking ring; 411. Locking key; 42. Cantilever; 421. Through hole; 422. First groove; 423. Second groove; 424. Boss; 425. Fixing hole; 426. Inclined surface; 5. Limiting ring; 6. Locking sleeve; 61. Boss surface; 62. Guide key; 63. Threaded hole; 7. Wire spring; 8. Plug EBO expansion insert; 9. Socket assembly; 10. Socket 101. Outer shell; 102. Guide keyway; 103. Locking groove; 104. Stepped surface; 11. Inner shell of the socket; 12. Limiting block; 13. Tail shell; 14. Branch seat; 15. EBO expansion ferrule of the socket; 16. Locking nut; 17. Interface sealing ring; 18. Crimping liner; 181. First external thread; 19. Crimping ring; 20. Tail end shell; 201. Internal thread; 202. Bevel; 203. Second external thread; 21. Tail cap; 212. Flat surface; 22. Sealing ring; 23. Optical cable reinforcing rib; 24. Set screw; 241. Threaded head; 242. Round pin; 243. Rectangular groove; 25. Fiber optic socket; 26. Outer sheath of the optical cable; 27. Optical fiber; 271. Fiber optic guide groove. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0032] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0033] like Figures 1 to 13 As shown, a preferred embodiment of a high-density small circular quick-plug fiber optic connector is illustrated, which includes: a plug assembly 1 and a socket assembly 9.

[0034] The plug assembly 1 includes a locking key 4, which is rotatable relative to the plug assembly 9. The locking key 4 has at least one through hole 421, and the inner wall of the through hole 421 has an inclined surface 426. A first groove 422 and a second groove 423 are formed at both ends of the inclined surface 426. The plug assembly 1 also includes a set screw 24, which extends into the through hole 421. An interface sealing ring 17 is installed inside the socket assembly 9, and the socket assembly 9 has a locking groove 102. During the insertion of the plug assembly 1 into the socket assembly 9, the set screw 24 initially... The plug assembly 1 is initially positioned in the first groove 422 to restrict the rotation of the locking key 4. When the plug assembly 1 is inserted into the interface sealing ring 17 and deforms it, the set screw 24 is driven to disengage from the first groove 422 and slide into the second groove 423 along the inclined surface 426. During the process of the set screw 24 sliding into the second groove 423, the rotational freedom of the locking key 4 is released, and the locking key 4 forms a snap-fit ​​locking engagement with the locking groove 102. The set screw 24 is positioned in the second groove 423 to maintain the snap-fit ​​locking engagement between the plug assembly 1 and the socket assembly 9.

[0035] Plug assembly 1 includes: plug housing 2, plug inner housing 3, locking key 4, limiting ring 5, locking sleeve 6, wire springs, and plug EBO expansion insert 8; plug inner housing 3 is installed inside plug housing 2, locking key 4 is rotatably installed on the outer wall of plug housing 2, and one end of each wire spring 7 is connected to plug housing 2, and the other end is connected to locking key 4, limiting ring 5 is sleeved on locking key 4 and the outer wall of plug housing 2 to limit wire spring 7, locking sleeve 6 is slidably sleeved on the outer wall of limiting ring 5 and locking key 4, and threaded hole 63 is opened on locking sleeve 6, through which set screw 24 passes. It extends into the through hole 421 of the locking key 4 and engages with the first groove 422 or the second groove 423. The plug EBO expansion core 8 is fixedly installed in the plug inner housing 3. The socket assembly 9 includes: socket outer housing 10, socket inner housing 11, limiting block 12, tail housing 13, branch seat 14 and socket EBO expansion core 15. The socket inner housing 11 is installed inside the socket outer housing 10, the limiting block 12 is sleeved on the socket inner housing 11, the two ends of the tail housing 13 are respectively installed on the socket outer housing 10 and the branch seat 14, and the socket EBO expansion core 15 is installed in the socket inner housing 11.

[0036] In actual use, the plug assembly 1 is mainly composed of seven parts: the plug outer shell 2, the plug inner shell 3, the locking key 4, the limiting ring 5, the locking sleeve 6, the wire springs 7, and the plug EBO expansion ferrule 8. The plug inner shell 3 is embedded and fixedly installed in the internal cavity of the plug outer shell 2, forming a nested fit. The plug inner shell 3 is used to support the plug EBO expansion ferrule 8, while the plug outer shell 2 is used to protect the internal components and to connect with the socket assembly 9. The locking key 4 is rotatably connected and mounted on the pre-set mounting position on the outer wall of the plug outer shell 2, ensuring that the locking key 4 can rotate around the mounting point. Two wire springs 7 are symmetrically arranged, with one end fixedly connected to the pre-set connection point of the plug outer shell 2 and the other end fixedly connected to the corresponding connection position of the locking key 4. The function of the wire springs 7 is to provide a reset spring force for the locking key 4, ensuring that the locking key 4 maintains its initial locking posture when no external force is applied. The limiting ring 5 adopts an interference fit or clearance fit and is sleeved on the outer wall of the connection between the locking key 4 and the plug housing 2. Its core function is to limit the two wire springs 7, prevent the wire springs 7 from shifting or falling off during the extension and retraction process, and ensure that the elastic force of the wire springs 7 is stably transmitted to the locking key 4. The inner wall of the through hole 421 on the locking key 4 is provided with an inclined surface 426. The inclined surface 426 has a smoothly transitioned inclined structure, and its two ends form a first groove 422 and a second groove 423 respectively. The first groove 422 and the second groove 423 are both arc-shaped grooves that are adapted to the end of the set screw 24. When the plug assembly 1 is initially inserted into the socket assembly 9, the set screw 24 is positioned in the first groove 422. When the locking sleeve 6 is pushed to slide along the axis, the locking sleeve 6 will drive the set screw 24 to move synchronously along the inclined surface 426 of the inner wall of the through hole 421. When the set screw 24 slides along the inclined surface 426 to the second groove 423 and is engaged, the plug assembly 1 and the socket assembly are locked together. When the plug assembly 1 and the socket assembly 9 are connected, the connecting end of the plug housing 2 extends into the internal cavity of the socket housing 10. At this time, the locking key 4 on the plug assembly 1, under the elastic force of the spring 7, forms a locking engagement with the locking groove 102 preset on the inner wall of the socket housing 10, thereby realizing the quick connection and locking of the plug assembly 1 and the socket assembly 9 and preventing them from falling off during use.

[0037] In addition to the above, the present invention also has the following embodiments: Furthermore, a high-density small circular quick-plug fiber optic connector is provided, wherein the outer wall of the plug housing 2 is provided with a first outer circumferential surface 210 and a second outer circumferential surface 220 connected in sequence. The diameter of the first outer circumferential surface 210 is larger than that of the second outer circumferential surface 220. Two axial limiting grooves 221 are provided on the outer wall of the second outer circumferential surface 220. The two limiting grooves 221 extend circumferentially along the second outer circumferential surface 220 on the side of the first outer circumferential surface 210 to form a clearance groove 222.

[0038] Furthermore, a high-density small circular quick-plug fiber optic connector includes a locking key 4 comprising a locking ring 41 and two cantilever arms 42. The two cantilever arms 42 extend axially from the inner wall of the locking ring 41, and a through hole 421 is formed at one end of the two cantilever arms 42 away from the locking ring 41. A boss 424 is provided at one end of the two cantilever arms 42 located inside the locking ring 41. The locking ring 41 is sleeved on the second outer circumferential surface 220, and a limiting ring 5 is sleeved on the two cantilever arms 42 and the second outer circumferential surface 220. The two cantilever arms 42 are placed in two limiting grooves 221, and the two bosses 424 can be engaged in two clearance grooves 222. Fixing holes 425 are provided on the two bosses 424, and protrusions 223 are correspondingly provided on the inner walls of the two limiting grooves 221. Mounting grooves 224 are provided on the protrusions 223, and the two ends of the two springs 7 are respectively fixed to the fixing holes 425 and the mounting grooves 224. Specifically, the two cantilever arms 42 of the locking key 4 are installed in the two limiting grooves 221 of the plug housing 2. The two ends of the coil spring 7 are respectively fixed to the fixing hole 425 and the mounting groove 224. The limiting ring 5 is fixed on the second outer circumferential surface 220, which can prevent the two coil springs 7 from coming out and causing unpredictable deformation. The inclined surface 426 and the first groove 422 and the second groove 423 provided on the two cantilever arms 42 ensure that when the set screw 24 is locked in the first groove 422 or the second groove 423 in the locked or unlocked state of the device, the coil spring 7 can provide force to ensure that the force is within the specified range, and the set screw 24 will not come out of the first groove 422 or the second groove 423. The set screw 24 can be threadedly fixed to the threaded hole 63 of the locking sleeve 6.

[0039] Furthermore, in a high-density small circular quick-plug fiber optic connector, the outer wall of the second outer circumferential surface 220 is provided with two guide grooves 225, and the inner wall of the locking sleeve 6 is provided with two guide keys 62. The locking sleeve 6 can slide axially on the outer wall of the second outer circumferential surface 220 through the two guide keys 62 and the two guide grooves 225. Specifically, the locking sleeve 6 is installed on the second outer circumferential surface 220 of the plug housing 2 and the outer wall of the limiting ring 5. The guide keys 62 of the locking sleeve 6 cooperate with the guide grooves 225 of the plug housing 2 so that the two cannot rotate relative to each other and can only move linearly. The set screw 24 can move back and forth with the locking sleeve 6 and maintain three states in the through hole 421 of the cantilever 42: the locked state of the first groove 422, the moving state of the inclined surface 426, and the unlocked state of the second groove 423. When the set screw 24 is located in the first groove 422 or the second groove 423, the connector can stably maintain the locked or unlocked state; while when the set screw 24 is located in the inclined surface 426, the connector is in the process of switching between locking and unlocking.

[0040] Furthermore, a high-density small circular quick-plug fiber optic connector is provided, wherein the outer wall of the locking ring 41 is provided with a locking key 411, and the outer wall of the first outer circumferential surface 210 is provided with a positioning key 211. Specifically, the locking key 4 is inserted along the small end of the plug housing 2, so that the cantilever 42 and the boss 424 are placed in the limiting groove 221 on the plug housing 2. After being inserted into place, the locking key 4 is rotated until the boss 424 is placed in the clearance groove 222. One end of the wire spring 7 is inserted into the fixing hole 425, and the other end is inserted into the mounting groove 224. Note that two pairs of wire springs 7 are symmetrically inserted. The limiting ring 5 is inserted. The outer wall of the limiting ring 5 is symmetrically provided with slotted holes. Adhesive is applied to the slotted holes on both sides and cured. The locking sleeve 6 is inserted. Note that the threaded hole 63 faces the front end. The locking key 411 is rotated to the position aligned with the positioning key 211. Finally, the set screws 24 are screwed into both sides of the locking sleeve 6.

[0041] Furthermore, a high-density small circular quick-plug fiber optic connector is provided, wherein an axial guide keyway 101 and a circumferentially arranged locking groove 102 are formed on the inner wall of the socket housing 10, and the guide keyway 101 and the locking groove 102 are connected; a stepped surface 103 is provided on the inner wall of the socket housing 10, and an interface sealing ring 17 is installed on the side of the stepped surface 103 facing the guide keyway 101; when the plug housing 2 is inserted into the socket housing 10, the positioning key 211 cooperates with the guide keyway 101 to achieve radial positioning, wherein the front end face of the plug housing 2 contacts the interface sealing ring 17, and when the front end face of the plug housing 2 contacts the interface sealing ring 17 and deforms it, the locking key 411 slides into the locking groove 102 through the guide keyway 101 and achieves snap-fit ​​limiting under the drive of the coil spring 7.

[0042] Furthermore, a high-density small circular quick-plug fiber optic connector is provided, wherein the end of the plug housing 2 away from the socket housing 10 is provided with a fiber optic cable fixing structure.

[0043] Furthermore, a high-density small circular quick-plug fiber optic connector is provided, wherein the optical cable fixing structure includes: a crimping liner 18, a crimping ring 19, a tail end housing 20, a tail cap 21, a sealing ring 22, and an optical cable reinforcing rib 23; the crimping liner 18 is threadedly connected to the plug housing 2, and the optical cable reinforcing rib 23 is placed between the outer wall of the crimping liner 18 and the crimping ring 19 and fixed by crimping; the tail end housing 20 is threadedly connected to the crimping liner 18, the tail cap 21 is threadedly connected to the tail end housing 20, and the sealing ring 22 is pressed between the tail cap 21 and the tail end housing 20, and the optical cable is sealed by compression deformation.

[0044] Specifically, the assembly relationship of the optical cable fixing structure is as follows: the crimping liner 18 is connected to the external thread on the plug housing 2 through the internal thread, the optical cable reinforcing rib 23 is placed between the outer circumferential surface of the crimping liner 18 and the crimping ring 19, and the crimping ring 19 is used to fix the optical cable reinforcing rib 23. The internal thread 201 at the front end of the tail end housing 20 is connected to the first external thread 181 on the crimping liner 18. The tail end housing is provided with a bevel 202 and a second external thread 203. The second external thread 203 is connected to the internal thread on the inner wall of the tail cover 21. A sealing ring 22 is installed between the bevel 202 of the tail end housing 20 and the plane 212 of the tail cover 21. As the threads of the tail cover 21 are tightened, the distance between the bevel 202 of the tail end housing 20 and the plane 212 of the tail cover 21 is shortened. The sealing ring 22 is squeezed towards the bevel 202 by the pressure of the plane 212 and deformed inward by the influence of the bevel 202. It is squeezed and deformed between the optical cable sheath 26 and the bevel 202 to achieve the purpose of sealing the optical cable.

[0045] Furthermore, a high-density small circular quick-plug fiber optic connector is provided, wherein both the plug EBO expansion ferrule 8 and the socket EBO expansion ferrule 15 are provided with fiber guide grooves, and the optical fibers pass through the fiber guide grooves and are cured with adhesive. Specifically, the plug EBO expansion ferrule 8 includes an EBO contact, a fiber optic socket 25, and an optical fiber 27. The fiber optic socket 25 is pre-inserted in a specified position and cured with adhesive; the optical fiber 27 is arranged in the fiber guide groove 271 of the EBO contact and cured with adhesive. The fiber optic socket 25 is installed at the rear end of the plug inner shell 3 and forms a specified tilt angle, forcing the optical fiber 27 to bend downwards, so that the EBO contact is in a specified position at the front end and maintains a certain angle and pre-stress. The socket EBO expansion ferrule 15 has the same structure as the plug EBO expansion ferrule 8.

[0046] Furthermore, a high-density small round quick-plug fiber optic connector is provided, wherein the set screw 24 includes a threaded head 241 and a round pin 242 connected in sequence. The outer wall of the threaded head 241 is provided with an external thread, and the threaded head is threadedly connected to the internal thread of the threaded hole through the external thread. The round pin 242 can cooperate with the first groove 422 or the second groove 423. A rectangular groove 243 is provided at the end of the threaded head 241 away from the round pin.

[0047] Connector plug initial state: See details Figure 10 As shown, the locking sleeve 6 is in the rear end position, the round pin 242 of the set screw 24 is engaged in the first groove 422, and the locking key 411 is aligned with the positioning key 211.

[0048] When the connector is inserted and self-locked: Hold the locking sleeve 6 and insert the connector plug assembly 1 into the socket assembly. At this time, the front end of the plug housing 2 moves toward the socket interface sealing ring 17. The insertion force is F1. F1 is smaller than the force F2 of the round pin 242 of the set screw 24 disengaging from the first groove 422. Continue to insert. When the front end of the plug housing 2 contacts the socket interface sealing ring 17 and causes it to reach the specified deformation, the insertion force F1 is greater than the force F2 of disengaging from the first groove 422. The round pin 242 disengages from the first groove 422 and slides into the second groove 423 along the inclined surface 426. During this process, the locking key 4 releases the rotation restriction. Driven by the spring 7, the locking key 4 and the locking key 411 on it rotate to the right. The locking key 411 enters the locking groove 102 inside the socket housing 10. At this time, the interface sealing ring 17 is moderately restored to its original shape. Under the force of the deformation of the interface sealing ring 17, the locking key 411 is in close contact with the locking groove 102. Furthermore, driven by the spring 7, the locking key 411 is fixed in the locking groove 102, and the round pin 242 on the set screw 24 is engaged in the second groove 423, thus locking the plug assembly 1 and the socket assembly 9. During this process, simply hold the locking sleeve 6 of the connector plug assembly 1 and insert it into the socket assembly 9 to complete the insertion self-locking.

[0049] Connector Pull-out and Unlocking: Holding the locking sleeve 6, pull the connector plug assembly 1 out of the socket assembly 9. Initially, when the pulling force F3 exceeds the retaining force F4 of the set screw 24's pin 242 disengaging from the second groove 423, the set screw 24's pin 242 disengages from the second groove 423. Under the pulling force, the pin 242 moves backward on the inclined surface 426. Since the locking sleeve 6 cannot rotate, the pin 242 of the set screw 24 forces the inclined surface 426 to rotate to the left, thus forcing the locking key 4 and its locking rotary key 411 to rotate to the left until the set screw 24's pin 242 engages in the first groove 422. At this point, the locking rotary key 411 disengages from the locking groove 102, aligning with the positioning key 211, and the connector plug assembly 1 is pulled out of the socket assembly 9. The entire process only requires holding the locking sleeve 6 to pull it out, thus completing the pull-out and unlocking process.

[0050] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-density, small circular, quick-plug fiber optic connector, characterized in that, include: Plug assembly, socket assembly; The plug assembly includes a locking key that is rotatable relative to the plug, and the locking key has at least one through hole. The inner wall of the through hole has an inclined surface, and a first groove and a second groove are formed at both ends of the inclined surface. The plug assembly also includes a set screw that extends into the through hole. The socket assembly has an interface sealing ring installed inside, and a locking groove is provided on the socket assembly; During the insertion of the plug assembly into the socket assembly, the set screw is initially positioned in the first groove to restrict the rotation of the locking key; When the plug assembly is inserted into contact with the interface sealing ring and deforms it, the set screw is driven to disengage from the first groove and slide into the second groove along the inclined surface; As the set screw slides into the second groove, it releases the rotational freedom of the locking key, and the locking key forms a snap-fit ​​locking engagement with the locking groove; and the set screw is positioned in the second groove to maintain the snap-fit ​​locking engagement between the plug assembly and the socket assembly.

2. The high-density small circular quick-plug fiber optic connector according to claim 1, characterized in that, The plug assembly further includes: a plug outer shell, a plug inner shell, a limiting ring, a locking sleeve, wire springs, and a plug EBO expansion insert; the plug inner shell is installed inside the plug outer shell, the locking key is rotatably installed on the outer wall of the plug outer shell, and one end of each of the two wire springs is connected to the plug outer shell, and the other end is connected to the locking key; the limiting ring is sleeved on the locking key and the outer wall of the plug outer shell to limit the wire springs; the locking sleeve is slidably sleeved on the outer wall of the limiting ring and the locking key; the locking sleeve has a threaded hole, and the set screw passes through the threaded hole and extends into the through hole to engage with the first groove or the second groove; the plug EBO expansion insert is fixedly installed in the plug inner shell; The socket assembly further includes: a socket outer shell, a socket inner shell, a limiting block, a tail shell, a branch seat, and a socket EBO expansion socket; the socket inner shell is installed inside the socket outer shell, the limiting block is sleeved on the socket inner shell, the socket outer shell and the branch seat are respectively installed at both ends of the tail shell, and the socket EBO expansion socket is installed in the socket inner shell.

3. A high-density small circular quick-plug fiber optic connector according to claim 2, characterized in that, The outer wall of the plug housing is provided with a first outer circumferential surface and a second outer circumferential surface connected in sequence. The diameter of the first outer circumferential surface is larger than that of the second outer circumferential surface. Two axial limiting grooves are opened on the outer wall of the second outer circumferential surface. The two limiting grooves extend along the circumferential direction of the second outer circumferential surface on the side of the first outer circumferential surface to form a clearance groove.

4. A high-density small circular quick-plug fiber optic connector according to claim 3, characterized in that, The locking key includes a locking ring and two cantilever arms. The two cantilever arms extend axially from the inner wall of the locking ring, and the through hole is opened at the end of the two cantilever arms away from the locking ring. The two cantilever arms are provided with a boss at the inner end of the locking ring. The locking ring is sleeved on the second outer circumferential surface, and the limiting ring is sleeved on the two cantilever arms and the second outer circumferential surface. The two cantilever arms are disposed in the two limiting grooves, and the two bosses can be engaged in the two clearance grooves. Fixing holes are opened on the two bosses, and protrusions are correspondingly provided on the inner walls of the two limiting grooves. The protrusions are provided with mounting grooves, and the two ends of the two coil springs are respectively fixed to the fixing holes and the mounting grooves.

5. A high-density small circular quick-plug fiber optic connector according to claim 3, characterized in that, The outer wall of the second outer circumferential surface is also provided with two guide grooves, and the inner wall of the locking sleeve is provided with two guide keys. The locking sleeve can slide axially on the outer wall of the second outer circumferential surface through the two guide keys and the two guide grooves.

6. A high-density small circular quick-plug fiber optic connector according to claim 4, characterized in that, The outer wall of the locking ring is provided with a locking key, and the outer wall of the first outer circumferential surface is provided with a positioning key.

7. A high-density small circular quick-plug fiber optic connector according to claim 6, characterized in that, The inner wall of the socket housing has an axial guide keyway and a circumferentially arranged locking groove, and the guide keyway and the locking groove are connected. The inner wall of the socket housing has a stepped surface, and the interface sealing ring is installed on the side of the stepped surface facing the guide keyway. When the plug housing is inserted into the socket housing, the positioning key cooperates with the guide keyway to achieve radial positioning. When the front end face of the plug housing contacts the interface sealing ring and causes the interface sealing ring to deform, the locking key slides into the locking groove through the guide keyway and achieves locking and limiting under the drive of the coil spring.

8. A high-density small circular quick-plug fiber optic connector according to claim 2, characterized in that, The plug housing is provided with an optical cable fixing structure at the end away from the socket housing.

9. A high-density small circular quick-plug fiber optic connector according to claim 2, characterized in that, The optical cable fixing structure includes: a crimping liner, a crimping ring, a tail end housing, a tail cap, a sealing ring, and an optical cable reinforcing rib; the crimping liner is threadedly connected to the plug housing, and the optical cable reinforcing rib is clamped between the outer wall of the crimping liner and the crimping ring and fixed by crimping; the tail end housing is threadedly connected to the crimping liner, the tail cap is threadedly connected to the tail end housing, and the sealing ring is pressed between the tail cap and the tail end housing.

10. A high-density small circular quick-plug fiber optic connector according to claim 2, characterized in that, Both the plug EBO expansion ferrule and the socket EBO expansion ferrule are provided with fiber optic guide slots, and the optical fiber passes through the fiber optic guide slots and is cured with adhesive.

Images