FC connector

Abstract

The invention relates to an FC connector which comprises a nut, an insertion core, a sleeve and a spring, the insertion core is inserted into the left end of the sleeve, the insertion core is in interference fit connection with the sleeve, the sleeve is inserted into the nut, an internal thread is arranged on the left side in an inner hole of the nut, a positioning end face is arranged on the right side of the nut, and a shaft hole is formed in the middle of the positioning end face. The right end of the sleeve penetrates through the shaft hole and extends to the outside of the nut, the spring is connected to the outer side of the sleeve in a sleeving mode, a step face is arranged on the left side of the sleeve, the left end of the spring abuts against the step face, and the right end of the spring abuts against the inner side wall of the positioning end face at the right end of the nut. The nut, the insertion core and the sleeve are coaxially arranged, and an interface positioning block is arranged on the outer wall of the left side part of the sleeve. The FC connector is simplified in structure, simple and convenient to connect, suitable for various existing optical cables, and capable of preventing the situation that the insertion core cannot stretch out and draw back due to the fact that glue adheres to the spring.

Description

Technical Field

[0001] The invention relates to the technical field of optical energy transmission in optical fibers, and in particular to an FC connector. Background Art

[0002] FC connector is a commonly used connector in optical fiber transmission system. The patent with publication number CN109856730A discloses an FC connector, which includes a nut, a stopper, a bushing, a ferrule, a spring, and a tail handle. The bushing is inserted into the right side of the nut, the ferrule is inserted into the bushing, a tail handle is provided on the left side of the ferrule, a spring is sleeved on the tail handle, the stopper is inserted into the left side of the nut, the stopper and the bushing are connected by interference fit, the end of the bushing is pressed against the flange outside the stopper, a step surface is provided inside the stopper, one end of the spring is pressed against the step surface inside the stopper, and the other end of the spring is pressed against the step surface on the tail handle. The spring can provide elastic force to the tail handle and the ferrule. Through this arrangement, when the FC connector is connected to another set of FC connectors through a coupler, the optical fibers in the ferrules of the two sets of FC connectors can be kept in contact, thereby ensuring the conduction of the optical path. The disadvantages of the existing FC connector are that, first, when connecting, the optical fiber is inserted into the ferrule, and the sheath of the optical cable is inserted into the stopper. When the FC connector is connected, the ferrules must be pressed against each other, and the ferrules will expand and contract, so that the optical fiber and the sheath will be relatively displaced. If there is a gap between the optical fiber and the sheath, the optical fiber and the sheath can be relatively displaced, then this FC connector can be used. However, if there is no gap between the optical fiber and the sheath, the optical fiber and the sheath cannot be relatively displaced, then this FC connector cannot be used, so this FC connector cannot be used for optical fibers that cannot be relatively displaced between the optical fiber and the sheath. Secondly, when the optical fiber is connected to the stopper, the tail handle and the ferrule, because the optical fiber needs to be bonded to the ferrule, glue is applied on the outside of the optical fiber. When the optical fiber is inserted into the ferrule, the excess glue on the outer wall of the optical fiber will inevitably be applied to the outer wall of the tail handle. These glues are easy to stick to the spring sleeved on the tail handle, resulting in a decrease in the expansion and contraction performance of the spring, making it difficult for the ferrule to flexibly expand and contract, affecting the connection of the FC connector. Thirdly, the existing FC connector has a large number of parts and is cumbersome to assemble. Therefore, it is necessary to improve the existing FC connector. Summary of the invention

[0003] The object of the present invention is to provide a FC connector that can solve the problems existing in the existing FC connectors described in the background technology.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: an FC connector, including a nut, a ferrule, a sleeve and a spring, the ferrule is inserted into the left end of the sleeve, and the ferrule is connected to the sleeve by interference fit, the sleeve is inserted into the nut, an internal thread is provided on the left side of the inner hole of the nut, a positioning end face is provided on the right side of the nut, an axial hole is provided in the middle of the positioning end face, the right end of the sleeve passes through the axial hole and extends to the outside of the nut, the spring is sleeved on the outside of the sleeve, a step face is provided on the left side of the sleeve, the left end of the spring is pressed against the step face, and the right end of the spring is pressed against the inner side wall of the positioning end face of the right end of the nut, a convex ring is provided on the right side of the sleeve, a limit retaining spring is provided on the left side of the convex ring, the diameter of the limit retaining spring is larger than the diameter of the axial hole on the positioning end face, the nut, the ferrule and the sleeve are coaxially arranged, and an interface positioning block is provided on the outer wall of the left side of the sleeve.

[0005] In the above scheme, the nut is provided with a top screw hole, and the sleeve is provided with a positioning portion corresponding to the top screw. With this arrangement, after the FC connector is connected, the top screw is tightened, and the sleeve can be limited in the axial and circumferential directions by the top screw. Even if the optical cable is subjected to tension, the ferrule in the FC connector will not be displaced, thereby ensuring the effective connection of the optical fibers of the two FC connectors and preventing the optical path from being disconnected.

[0006] In the above solution, the right side of the sleeve is provided with a riveting part for connecting to the SMA connector, and a plurality of annular grooves are provided on the outer wall of the riveting part. Through this arrangement, the riveting part of the FC connector can be riveted to the SMA connector, making the connection between the two more secure.

[0007] In the above solution, the rivet part is provided with a top screw groove. By providing the top screw groove, the rivet part and the SMA connector can be positioned axially and radially by the top screw, so that the connection between the two is more secure.

[0008] In the above scheme, the left side of the sleeve is provided with an interface protection ring, which is fixedly connected to the sleeve. By providing the interface protection ring, the end portion of the sleeve can be strengthened and its service life can be extended.

[0009] In the above scheme, an FC connection coupler is also included, which includes a threaded connection pipe, the external thread of the threaded connection pipe matches the internal thread of the nut, positioning grooves are respectively provided on both sides of the threaded connection pipe, the positioning grooves are adapted to the interface positioning blocks on the sleeve, and the length of the threaded connection pipe is adapted to the length of the ferrules of the two FC connectors. Through this arrangement, two FC connectors can be connected through the FC connection coupler, and the stability of the connection is guaranteed.

[0010] In the above scheme, a fixing seat is also provided in the middle of the threaded connection pipe, the fixing seat is fixedly connected to the threaded connection pipe, and an assembly hole is provided on the fixing seat. By providing the fixing seat, it is convenient to fix the connection coupler to a predetermined device.

[0011] In the above solution, a sealing groove is further provided on one side wall of the fixing seat, and a sealing ring is provided in the sealing groove. By providing the sealing ring, the sealing performance of the connection between the fixing seat and the equipment can be ensured.

[0012] The present invention has positive effects: 1) The FC connector of the present invention has an interference fit connection with the sleeve. Therefore, when the FC connector is connected, the ferrule and the sleeve can be synchronously extended and retracted relative to the nut, so that the optical fiber connected to the ferrule and the sheath connected to the sleeve can be synchronously extended and retracted accordingly. Therefore, when the FC connector of the present invention is connected, there is no need for relative displacement between the optical fiber and the sheath. Therefore, the FC connector of the present invention is not only applicable to the connection of optical cables with gaps between the optical fiber and the sheath and can be relatively displaced, but also applicable to the connection of optical cables with no gaps between the optical fiber and the sheath and cannot be relatively displaced. Therefore, it has better applicability and can be applied to various existing optical cables. 2) The FC connector of the present invention has an interference fit connection with the sleeve, and the spring is arranged on the outside of the sleeve. When the optical cable is connected to the FC connector, the optical fiber is inserted into the ferrule and the sheath is inserted into the sleeve. The glue on the outer wall of the optical fiber will not be applied to the outer wall of the sleeve, so it will not affect the extension and retraction of the spring, so the extension and retraction of the ferrule can be guaranteed. 3) Compared with the existing FC connector, the FC connector of the present invention has a greatly simplified structure and a small number of components, including only four parts. The FC connector is easier to assemble and has high assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the FC connector of the present invention.

[0014] Figure 2 It is a schematic cross-sectional structural diagram of the FC connector of the present invention.

[0015] Figure 3 It is a schematic diagram of the connection structure of the FC connector and the SMA connector of the present invention.

[0016] Figure 4 It is a schematic diagram of the connection structure between the FC connector and the FC connection coupler of the present invention.

[0017] Figure 5 It is a schematic cross-sectional structural diagram of the connection between the FC connector of the present invention and the FC connection coupler.

[0018] The reference numerals in the figure are: nut 1, positioning end face 11, internal thread 12, top screw 13, core 2, guide surface 21, sleeve 3, interface part 31, step surface 32, protrusion 33, limit retaining spring 34, riveting part 35, interface positioning block 36, interface protection ring 37, spring 4, optical cable 5, sheath 51, optical cable 52, SMA connector 6, FC connection coupler 7, positioning groove 71, fixing seat 72, sealing ring 73. DETAILED DESCRIPTION

[0019] The technical scheme of the present invention is clearly and completely described below through embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1 and Figure 2 An FC connector shown includes a nut 1 , a ferrule 2 , a sleeve 3 and a spring 4 .

[0021] The nut 1, the insert 2 and the sleeve 3 are coaxially arranged.

[0022] The nut 1 is made of stainless steel. An internal thread 12 is provided on the left side of the inner hole of the nut 1, a positioning end face 11 is provided on the right side of the nut 1, an axial hole is provided in the middle of the positioning end face 11, and a top screw hole is also provided on the nut 1. The top screw hole is preferably arranged on the positioning end face 11. The top screw 13 is installed along the radial direction during installation. The end of the top screw 13 can extend to the axial hole in the middle of the positioning end face 11. Correspondingly, a positioning portion can be provided on the outer wall of the sleeve 3. The positioning portion can be an axial plane section provided on the outer wall of the sleeve 3. When the top screw 13 presses against the plane section, the sleeve 3 can be limited axially and circumferentially.

[0023] The sleeve 3 is made of stainless steel. An interface portion 31 is provided at the left end of the sleeve 3. The interface portion 31 is used for plug-in connection between the FC connector and the FC connector coupler 7. A plug-in hole for connecting the ferrule 2 is provided inside the interface portion 31. The plug-in hole is coaxially arranged with the sleeve 3. A step surface 32 is provided on the outer wall of the sleeve 3 on the right side of the socket portion. The step surface 32 is used to limit the left end of the spring 4. The middle part of the sleeve 3 is a straight tube. The right end of the sleeve 3 passes through the axial hole at the right end of the nut 1 and extends to the outside of the nut 1.

[0024] A convex ring 33 is provided on the right side of the sleeve 3, and the convex ring 33 is arranged on the right side of the positioning end face 11 of the nut 1. A limiting retaining spring 34 is provided on the left side of the convex ring 33. The diameter of the limiting retaining spring 34 is larger than the diameter of the axial hole on the positioning end face. Through this arrangement, the limiting retaining spring 34 can be used to quickly complete the connection between the sleeve 3 and the nut 1, and the limiting retaining spring 34 can limit the axial position of the sleeve 3.

[0025] On the sleeve 3, a rivet portion 35 for connecting to the SMA connector 6 is provided on the right side of the convex ring 33, and a plurality of annular grooves are provided on the outer wall of the rivet portion 35. Through this arrangement, the rivet portion 35 of the FC connector can be connected to the SMA connector by rivet connection, making the connection between the two more secure. The sleeve 3 is used for plugging optical fibers, and the inner diameter of the sleeve 3 is slightly larger than the outer diameter of the sheath 51 of the optical cable 5.

[0026] An interface positioning block 36 is provided on the outer wall of the left side of the sleeve 51 . The interface positioning block 36 can be set as a common rectangular positioning block on the FC connector, and its shape matches the shape and size of the positioning groove on the FC connector coupler 7 .

[0027] In order to strengthen the end portion of the sleeve 3 and extend its service life, an interface protection ring 37 is provided on the left side of the sleeve 3 , and the interface protection ring 37 is fixedly connected to the sleeve 3 .

[0028] The ferrule 2 is a cylindrical ferrule, and the outer diameter of the ferrule 2 is adapted to the aperture of the plug hole on the sleeve 3, and the ferrule 2 is connected with the sleeve 3 by interference fit. A through hole for inserting the optical fiber 52 is provided inside the ferrule 2, and the diameter of the through hole is slightly larger than the outer diameter of the optical fiber 52. The ferrule 2 and the sleeve 3 are coaxially arranged.

[0029] In the prior art, the optical fiber 52 generally includes a core, a cladding, and a coating layer. The optical fiber plugged into the ferrule described herein refers to the portion of the optical fiber without the coating layer.

[0030] In order to facilitate the insertion of the optical fiber 52 into the ferrule 2 , a tapered guide surface is provided on the inner end surface of the ferrule 2 .

[0031] The spring 4 can be a cylindrical spring, preferably a compression spring, and the length of the spring 4 can be selected as needed. The spring 4 is sleeved on the outer wall of the sleeve 3, the left end of the spring 4 presses on the step surface 32 on the sleeve 3, and the right end of the spring 4 presses on the inner wall of the positioning end surface 11 of the right end of the nut 1.

[0032] When the FC connector of the present invention is used, it is used together with the FC connector coupler 7. Figure 4 and 5As shown, the FC connection coupler 7 includes a threaded connection pipe, the external thread of the threaded connection pipe matches the internal thread of the nut 1, and positioning grooves 71 are respectively provided on both sides of the threaded connection pipe, and the positioning grooves 71 are adapted to the interface positioning blocks 36 on the sleeve 3, and the length of the threaded connection pipe is adapted to the length of the ferrules 2 of the two FC connectors. Through this arrangement, two FC connectors can be connected through the FC connection coupler, and the stability of the connection is guaranteed.

[0033] A fixing seat 72 is also provided in the middle of the threaded connection pipe, and the fixing seat 72 is fixedly connected to the threaded connection pipe, and an assembly hole is provided on the fixing seat 72. By providing the fixing seat 72, it is convenient to fix the connection coupler to a predetermined device.

[0034] A sealing groove is also provided on one side wall of the fixing seat 72, and a sealing ring 73 is provided in the sealing groove. By providing the sealing ring 73, the sealing performance of the connection between the fixing seat 72 and the equipment can be guaranteed.

[0035] like Figure 3-5As shown in the figure, when assembling the FC connector of the present invention, the ferrule 2 is connected with the sleeve 3 by interference fit, the spring 4 is sleeved on the sleeve 3, and then the right end of the sleeve 3 is passed through the axial hole at the right end of the nut 1, so that the convex ring 33 is located on the right side of the positioning end face 11 of the nut 1, and then the retaining ring 34 is installed on the left side of the convex ring 33, so that the connection between the sleeve 3 and the nut 1 is completed, and then the interface protection ring 37 is inserted into the interface part 31 at the left end of the sleeve 3, and then the sheath 51 is removed from the end of the optical cable connected with the FC connector, so that the optical cable is connected to the FC connector. The fiber 52 leaks out, the surface of the optical fiber 52 is coated with glue, and inserted into the ferrule 2, the end portion with the sheath 51 is inserted into the sleeve 3, the rivet portion 35 at the right end of the sleeve 3 is plugged into the connection port of the FC connector, and then riveted again to make the FC connector and the sleeve 3 riveted to each other, after the connection is completed, the top screw 13 on the FC connector is tightened, so that the top screw 13 is pressed into the top screw groove on the rivet portion 35, and the rivet portion 35 is positioned axially and circumferentially by the top screw 13, so that the connection between the sleeve 3 and the FC connector is more secure. When two FC connectors are connected, the two FC connectors are first plugged into the two ends of the FC connector coupler 7 respectively, and the interface positioning block 36 is aligned with the positioning groove 71 on the FC connector coupler 7 during plugging, and after the plugging is completed, the nut 1 is rotated to make the nut 1 firmly connected to the FC connector coupler. The length of the FC connection coupler 7 should be smaller than the length of the ferrules 2 of the two FC connectors. When the two FC connectors are connected to the FC connection coupler 7, the ferrules 2 of the two FC connectors need to be aligned and fit together. When connected, the ferrules 2 and the sleeve 3 can be axially displaced relative to the nut 1 in the direction away from the FC connection coupler 7, and the spring 4 will be compressed to provide elastic force to the sleeve 3, so that the ferrules 2 on both sides of the FC connection coupler 7 have relative tightening force, so that the optical fibers 52 in the two FC connectors can maintain the docking state, thereby ensuring the stability of the optical path. After completing the above connection, tighten the top screw 13 on the nut 1, and the sleeve 2 can be axially and axially limited by the top screw 13 to prevent the sleeve 3 and the ferrule 2 from being located in the direction away from the FC connection coupler 7 when the optical fiber 52 is subjected to tension, further ensuring the stability of the optical path.

[0036] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that numerous changes, modifications, substitutions and alterations may be made to the embodiments without departing from the spirit and scope of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An FC connector, characterized in that: It includes a nut, a core, a sleeve and a spring. The core is inserted into the left end of the sleeve, and the core is connected to the sleeve by interference fit. The sleeve is inserted into the nut. An internal thread is provided on the left side of the inner hole of the nut, a positioning end face is provided on the right side of the nut, an axial hole is provided in the middle of the positioning end face, the right end of the sleeve passes through the axial hole and extends to the outside of the nut. The spring is sleeved on the outside of the sleeve, a step surface is provided on the left side of the sleeve, the left end of the spring is pressed against the step surface, and the right end of the spring is pressed against the inner wall of the positioning end face of the right end of the nut, a convex ring is provided on the right side of the sleeve, a limiting retaining spring is provided on the left side of the convex ring, the diameter of the limiting retaining spring is larger than the diameter of the axial hole on the positioning end face, the nut, the core and the sleeve are coaxially arranged, and an interface positioning block is provided on the outer wall of the left side of the sleeve.

2. The FC connector according to claim 1, characterized in that: The nut is provided with a top screw hole, and the sleeve is provided with a positioning portion corresponding to the top screw.

3. The FC connector according to claim 1, characterized in that: The right side of the sleeve is provided with a riveting portion for connecting the SMA connector, and a plurality of annular grooves are provided on the outer wall of the riveting portion.

4. The FC connector according to claim 1, characterized in that: The riveting part is provided with a top screw groove.

5. The FC connector according to claim 1, characterized in that: An interface protection ring is provided on the left side of the sleeve, and the interface protection ring is fixedly connected to the sleeve.

6. The FC connector according to claim 1, characterized in that: It also includes an FC connection coupler, which includes a threaded connection pipe, the external thread of the threaded connection pipe matches the internal thread of the nut, positioning grooves are respectively provided on both sides of the threaded connection pipe, the positioning grooves are adapted to the interface positioning blocks on the sleeve, and the length of the threaded connection pipe is adapted to the length of the ferrules of the two FC connectors.

7. The FC connector according to claim 6, characterized in that: A fixing seat is also provided in the middle of the threaded connection pipe, the fixing seat is fixedly connected to the threaded connection pipe, and an assembly hole is provided on the fixing seat.

8. The FC connector according to claim 7, characterized in that: A sealing groove is also provided on one side wall of the fixing seat, and a sealing ring is provided in the sealing groove.

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