SMA optical fiber connector

Abstract

The utility model relates to the technical field of optical energy transmission in optical fibers, in particular to an SMA optical fiber connector which comprises a nut connecting piece, an optical fiber insertion core and a connecting sleeve, one end of the optical fiber insertion core is fixedly connected with the connecting sleeve, the other end of the optical fiber insertion core is connected with the nut connecting piece in a sleeved mode, and a limiting convex ring is arranged on the optical fiber insertion core. The nut connecting piece is provided with a limiting portion corresponding to the protruding ring, the outer wall of the optical fiber insertion core is provided with a plurality of sealing grooves, sealing rings are arranged in the sealing grooves, the inner wall of the nut connecting piece is provided with internal threads, and the outer portion of the nut connecting piece is provided with a plurality of connecting through holes used for penetrating through the connecting piece. According to the SMA optical fiber connector, the connecting through hole is formed in the nut connecting piece, other optical fiber connectors or fixing objects can be connected through the connecting piece, the nut connecting piece of the SMA optical fiber connector and the external thread connecting pipe cannot rotate relatively, connection of the SMA optical fiber connector is firmer, looseness cannot occur in the using process, and optical fiber communication is more stable.

Description

Technical Field

[0001] The utility model relates to the technical field of light energy transmission in optical fibers, in particular to an SMA optical fiber connector. Background Art

[0002] The SMA905 fiber optic connector is a widely used fiber optic connector in industrial and medical applications. Its all-metal design offers high durability and corrosion resistance, and it features a threaded coupling nut to ensure a stable and reliable connection. Existing SMA905 fiber optic connectors typically consist of a ferrule and a nut. During fiber production, the SMA connector can be directly attached to the end of the optical fiber for integrated use. Existing SMA fiber optic connectors typically connect two SMA connectors by threading them onto the ends of a male connector to connect the optical fibers. After connection, the threaded connection between the nut and the male connector can easily loosen, especially if the optical fiber is twisted. This can easily cause the threaded connection between the SMA connector and the male connector to loosen or even fall off, compromising the stability of the optical fiber communication line. Furthermore, during fiber optic wiring, workers need to pull on the SMA connector to pull the cable. This can easily cause the SMA connector to disconnect from the optical fiber or even break the fiber, necessitating improvements. Summary of the Invention

[0003] The purpose of the present utility model is to provide an SMA fiber optic connector that can solve the problem that the threaded connection between the nut connector and the external threaded connecting tube of the existing SMA fiber optic connector described in the background art is easy to loosen or even fall off, affecting the stability of the fiber optic communication line connection.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: an SMA fiber optic connector, including a nut connector, an optical fiber ferrule and a connecting sleeve, one end of the optical fiber ferrule is fixedly connected to the connecting sleeve, and the other end of the optical fiber ferrule is sleeved with the nut connector, a limiting convex ring is provided on the optical fiber ferrule, and a limiting portion corresponding to the convex ring is provided on the nut connector, a plurality of sealing grooves are provided on the outer wall of the optical fiber ferrule, and a sealing ring is provided in the sealing groove, an internal thread is provided on the inner wall of the nut connector, and a plurality of connecting through holes for passing the connector are provided on the outside of the nut connector.

[0005] In the above solution, the nut connector is a hexagonal nut connector, and the connecting through holes are arranged near each corner of the nut connector. This arrangement makes it easier to connect the nut connector to other optical fiber connectors or other fixed objects near the optical fiber.

[0006] In the above solution, the connector is a steel wire, iron wire, binding rope, cable tie, or other fastening connector. After the SMA fiber optic connector is connected, the connector can be passed through the connecting hole on the nut connector to connect to other nearby fiber optic connectors or fixed objects. This effectively prevents relative rotation between the nut connector and the optical fiber, ensuring that the fiber optic connector maintains a stable connection, thereby ensuring the stability of fiber optic communication.

[0007] The above solution also includes a dust cover that is threadably coupled to the internal thread of the nut connector and has a receiving hole for accommodating the optical fiber ferrule. The dust cover protects the optical fiber ferrule and the fiber core therein, preventing the fiber core and the optical fiber ferrule from collision, abrasion, or contamination during packaging and transportation.

[0008] The above solution also includes a fiber optic connector protective sleeve, which has a receiving cavity inside. The fiber optic connector protective sleeve is connected to the connecting sleeve, and an annular groove is provided on the outer wall of the connecting sleeve. A threaded hole is provided on the fiber optic connector protective sleeve, and the position of the threaded hole corresponds to the position of the annular groove. A screw is provided in the threaded hole, and the end of the screw can extend into the annular groove. By providing the fiber optic connector protective sleeve, after the SMA fiber optic connector is connected to the optical fiber, the fiber optic connector protective sleeve can be connected to the connecting sleeve, so that the SMA fiber optic connector enters the receiving cavity inside the fiber optic connector protective sleeve. When laying the optical fiber line, the staff can pull the fiber optic connector protective sleeve to pull the optical fiber without causing the connection between the SMA fiber optic connector and the optical fiber to be disconnected, and will not cause damage to the optical fiber, which can make the pulling and laying of the optical fiber more convenient.

[0009] In the above solution, a pulling hole is further provided on the optical fiber connector protective cover. By providing the pulling hole, it is more convenient to pull the cable through the optical fiber connector protective cover.

[0010] In the above embodiment, the outer wall of the connector sleeve is further provided with a sealing groove, within which a sealing ring is located. The provision of the sealing groove and the sealing ring creates a waterproof seal between the connector sleeve and the optical fiber connector protective sleeve, effectively preventing water from entering the optical fiber connector. Even if the optical fiber product is submerged in water during storage or transportation, the performance of the optical fiber will not be affected.

[0011] In the above embodiment, the outer wall of the fiber optic ferrule is provided with a plurality of annular grooves. The fiber optic ferrule is inserted into the inner hole of the connector sleeve and fixedly connected by glue. The outer wall of the connector sleeve is provided with threaded holes, the positions of the threaded holes corresponding to the positions of the annular grooves. A threaded top post is provided in the threaded hole, and the end of the threaded top post extends into the annular groove on the outer wall of the fiber optic ferrule. The provision of the threaded holes and the threaded top post can ensure a more stable connection between the connector sleeve and the fiber optic ferrule, preventing the connection between the connector sleeve and the fiber optic ferrule from loosening after the glue fails.

[0012] In the above solution, a retaining spring groove is further provided on the outer wall of the optical fiber ferrule, and a retaining spring is provided in the retaining spring groove for limiting the position of the nut connector. By providing the retaining spring groove and retaining spring, the retaining spring can cooperate with the raised ring to limit the displacement range of the nut connector relative to the optical fiber ferrule.

[0013] The present invention has positive effects: 1) The present SMA optical fiber connector is provided with a connection through-hole on the nut connector. After the optical fiber connectors are connected, steel wire, iron wire, cable tie or other fastening connectors can be passed through the connection through-holes on the nut connectors on each optical fiber connector to connect these nut connectors, or the nut connectors can be fixed to other fixed objects. This connection prevents the nut connector of the SMA optical fiber connector and the external threaded connecting tube from rotating relative to each other, making the connection of the SMA optical fiber connector more secure and not loose during use, making optical fiber communication more stable. 2) The present SMA optical fiber connector is provided with a plurality of sealing grooves on the outer wall of the optical fiber ferrule. By providing sealing rings in the sealing grooves, a seal can be formed between the optical fiber ferrule and the inner wall of the external threaded connecting tube after the SMA optical fiber connector is connected to the external threaded connecting tube, so that the optical fiber connector part has a strong waterproof performance. Even if the optical fiber is immersed in water for use, it will not affect the quality of optical fiber communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of the SMA optical fiber connector of the present invention.

[0015] Figure 2 This is a schematic structural diagram of the SMA optical fiber connector of the present invention (the optical fiber connector protective cover is not shown).

[0016] Figure 3 This is a schematic cross-sectional view of the SMA optical fiber connector of the present invention.

[0017] Figure 4 The figure is a schematic structural diagram of the optical fiber ferrule of the SMA optical fiber connector of the present invention.

[0018] The accompanying drawings are marked as follows: nut connector 1, limiting portion 11, connecting through hole 12, optical fiber ferrule 2, protruding ring 21, sealing groove 22, sealing ring 23, annular groove 24, connecting sleeve 3, threaded hole 31, threaded top column 32, annular groove 33, sealing groove 34, sealing ring 35, dust cover 4, optical fiber connector protective cover 5, threaded hole 51, screw 52, ​​pulling hole 53, optical fiber cable 6, outer sheath 61, armor layer 62, fiber core 63, retaining spring 7. DETAILED DESCRIPTION

[0019] The following examples clearly and completely describe the technical solutions of the present invention. Obviously, the examples described are only a portion of the embodiments of the present invention, not all of them. Based on the examples of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figure 1-4 An SMA optical fiber connector shown includes a nut connector 1, an optical fiber ferrule 2 and a connecting sleeve 3.

[0021] The nut connector 1 is a metal component with an internal thread on its inner wall. The shape of the nut connector 1 can be adopted from the nut connectors on existing SMA fiber optic connectors, for example, it can be configured as a hexagonal nut. A stopper 11 is provided at the opening on one side of the nut connector 1, which cooperates with the bead 21 on the fiber optic ferrule 2. A connecting through hole 12 is provided on the outside of the nut connector 1. To facilitate connecting the nut connectors 1 on multiple SMA fiber optic connectors through the connector, or to securely connect the nut connector 1 to other fixed objects, the connecting through holes 12 can be provided near each corner of the nut connector 1.

[0022] The connector can be a steel wire, iron wire, binding rope, cable tie, or other fastening connector. After the SMA fiber optic connector is connected, the connector can be passed through the connection hole 12 on the nut connector 1 and connected to other nearby fiber optic connectors or fixed objects. This can effectively prevent the nut connector 1 from rotating relative to the optical fiber, ensuring that the fiber optic connector can maintain a stable connection, thereby ensuring the stability of the fiber optic communication.

[0023] like Figure 4 As shown, the optical fiber ferrule 2 is a metal component having a through hole therein for passing the optical fiber core 63. The shape of the optical fiber ferrule 2 can be adapted from that of the optical fiber ferrule in an existing SMA optical fiber connector. A limiting collar 21 is provided on the outer wall of the optical fiber ferrule 2. The collar 21 cooperates with the limiting portion 11 on the nut connector 1 to limit the axial displacement of the optical fiber ferrule 2. To limit the axial displacement of the nut connector 1 and the optical fiber ferrule 2, a retaining spring groove is also provided on the outer wall of the optical fiber ferrule 2. After the optical fiber ferrule 2 and the nut connector 1 are sleeved together, a retaining spring 7 is installed in the retaining spring groove so that the limiting portion 11 of the nut connector 1 is located between the retaining spring 7 and the collar 21. The retaining spring 7 and the collar 21 limit the range of axial displacement between the nut connector 1 and the optical fiber ferrule 2.

[0024] A plurality of sealing grooves 22 are provided on the outer wall of the optical fiber ferrule 2. The sealing grooves 22 are provided on the outer wall of the optical fiber ferrule 2 and are located within the inner hole of the nut connector 1. Sealing rings 23 are provided within the sealing grooves 22. The number of sealing grooves 22 and sealing rings 23 can be set as needed, for example, 1-3 sealing grooves 22 and sealing rings 23 can be provided.

[0025] One end of the optical fiber ferrule 2 is provided with a plug-in portion, and a plurality of annular grooves 24 are provided on the outer wall of the plug-in portion. The plug-in portion is plugged into the inner hole of the connecting sleeve 3 and is fixedly connected to the connecting sleeve 3 by glue.

[0026] The connector sleeve 3 can be made of metal. One end of the connector sleeve 3 is sleeved onto the outside of the optical fiber cable 6 and is connected to the armor layer 62 of the optical fiber cable 6 by pressure riveting or glue. The inner hole of the connector sleeve 3 is provided with a stepped surface, which can limit the outer sheath layer and armor layer of the optical fiber cable, respectively, and limit the insertion position of the outer sheath layer 61 and armor layer 62 with the connector sleeve 3. The other end of the connector sleeve 3 is connected to the insertion portion of the optical fiber ferrule 2.

[0027] Preferably, a threaded hole 31 is provided on the outer wall of the connecting sleeve 3. The position of the threaded hole 31 corresponds to the position of the annular groove 24 on the outer wall of the insertion portion of the optical fiber ferrule 2. A threaded top post 32 is provided in the threaded hole 31. The end of the threaded top post 32 extends into the annular groove 24 on the outer wall of the optical fiber ferrule 2. The provision of the threaded hole 31 and the threaded top post 32 can make the connection between the connecting sleeve 3 and the optical fiber ferrule 2 more stable, preventing the connection between the connecting sleeve 3 and the optical fiber ferrule 2 from loosening after the glue fails.

[0028] As a preferred embodiment, a dust cover 4 can also be provided. The dust cover 4 can be made of plastic. The dust cover 4 is threadedly engaged with the internal thread of the nut connector 1. The interior of the dust cover 4 is provided with a receiving hole for accommodating the optical fiber ferrule 2. The provision of the dust cover 4 can protect the optical fiber ferrule 2 and the fiber core 63 therein, preventing the fiber core and the optical fiber ferrule 2 from collision, wear, or contamination during packaging and transportation.

[0029] As a preferred embodiment, a fiber optic connector protective sleeve 5 can also be provided. The fiber optic connector protective sleeve 5 has a receiving cavity therein. The fiber optic connector protective sleeve 5 is sleeved with the connecting sleeve 3. An annular groove 33 is provided on the outer wall of the connecting sleeve 3. A threaded hole 51 is provided on the fiber optic connector protective sleeve 5. The position of the threaded hole 51 corresponds to the position of the annular groove 33. A screw 52 is provided in the threaded hole 51, and the end of the screw 52 can extend into the annular groove 33. To facilitate pulling the optical fiber cable, a pulling hole 53 is also provided on the fiber optic connector protective sleeve 5. By providing the fiber optic connector protective sleeve 5, after the SMA optical fiber connector is connected to the optical fiber, the fiber optic connector protective sleeve 5 can be sleeved on the connecting sleeve 3, so that the SMA optical fiber connector enters the receiving cavity inside the fiber optic connector protective sleeve, and then the connection is fixed with screws. When laying the optical fiber line, the worker can pull the optical fiber by pulling the pulling hole 53 on the fiber optic connector protective sleeve 5 without disconnecting the connection between the SMA optical fiber connector and the optical fiber or damaging the optical fiber, making the pulling and laying of the optical fiber more convenient.

[0030] As a preferred embodiment, a sealing groove 34 may be provided on the outer wall of the connecting sleeve 3, and a sealing ring 35 may be provided in the sealing groove 34. The provision of the sealing groove 34 and the sealing ring 35 forms a waterproof seal between the connecting sleeve 3 and the optical fiber connector protective sleeve 5, effectively preventing water from entering the optical fiber connector. Even if the optical fiber product is immersed in water during storage or transportation, the performance of the optical fiber will not be affected.

[0031] The SMA fiber optic connector of the present invention is used by first removing a portion of the outer sheath of the optical fiber cable to expose the armor layer inside, then removing a portion of the armor layer to expose the fiber core inside, fitting the connector sleeve onto the optical fiber cable, installing a sealing ring in the sealing groove of the optical fiber ferrule, fitting the optical fiber ferrule onto the nut connector, then installing a retaining spring on the optical fiber ferrule, inserting the optical fiber core into the inner hole of the optical fiber ferrule, then applying glue to the outer wall of the plug portion of the optical fiber ferrule and inserting it into the connector sleeve, then tightening the threaded top post on the connector sleeve so that the end of the threaded top post extends into the annular groove on the plug portion, thereby fixing the optical fiber ferrule and the connector sleeve, then tightly inserting the optical fiber cable into the connector sleeve, and then fixing the connection by glue or by riveting the connector sleeve to the armor layer on the optical fiber cable, and then cutting off the excess optical fiber core to complete the connection between the optical fiber connector and the optical fiber cable. Then, fitting the dust cover onto the optical fiber ferrule, and fixing the dust cover to the nut connector by threading. Then install a sealing ring in the sealing groove on the connecting sleeve, and then put the optical fiber connector protective sleeve on the outside of the optical fiber connector, and make the threaded hole on the optical fiber connector protective sleeve correspond to the position of the annular groove on the connecting sleeve, install screws in the threaded holes on the optical fiber connector protective sleeve, and tighten the screws so that the ends of the screws extend into the annular groove on the connecting sleeve. Through this connection, the optical fiber connector protective sleeve can be fixedly put on the outside of the SMA optical fiber connector to protect the SMA optical fiber connector. When wiring, the staff can pull the optical fiber connector protective sleeve to pull the optical fiber cable for wiring, and the connection between the optical fiber cable and the optical fiber connector will not be broken when pulling the cable.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the scope and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An SMA optical fiber connector, characterized in that: It includes a nut connector, an optical fiber ferrule and a connecting sleeve. One end of the optical fiber ferrule is fixedly connected to the connecting sleeve, and the other end of the optical fiber ferrule is sleeved with the nut connector. A limiting convex ring is provided on the optical fiber ferrule, and a limiting portion corresponding to the convex ring is provided on the nut connector. Several sealing grooves are provided on the outer wall of the optical fiber ferrule, and sealing rings are provided in the sealing grooves. An internal thread is provided on the inner wall of the nut connector, and a plurality of connecting through holes for passing the connector are provided on the outside of the nut connector.

2. The SMA optical fiber connector according to claim 1, wherein: The nut connector is a hexagonal nut connector, and the connecting through holes are arranged near each corner of the nut connector.

3. The SMA optical fiber connector according to claim 1, wherein: The connecting piece is a steel wire, an iron wire, a binding rope, a cable tie or other fastening connecting pieces.

4. The SMA optical fiber connector according to claim 1, wherein: It also includes a dust cover, which is threadably connected to the internal thread of the nut connector, and an accommodating hole for accommodating the optical fiber ferrule is provided inside the dust cover.

5. The SMA optical fiber connector according to claim 1, wherein: It also includes an optical fiber connector protective cover, which has an accommodating cavity inside. The optical fiber connector protective cover is connected to the connecting cover, and an annular groove is provided on the outer wall of the connecting cover. A threaded hole is provided on the optical fiber connector protective cover, and the position of the threaded hole corresponds to the position of the annular groove. A screw is provided in the threaded hole, and the end of the screw can extend into the annular groove.

6. The SMA optical fiber connector according to claim 5, wherein: A pulling hole is also provided on the optical fiber connector protective cover.

7. The SMA optical fiber connector according to claim 1, wherein: A sealing groove is also provided on the outer wall of the connecting sleeve, and a sealing ring is provided in the sealing groove.

8. The SMA optical fiber connector according to claim 1, wherein: The outer wall of the optical fiber ferrule is provided with several annular grooves. The optical fiber ferrule is inserted into the inner hole of the connecting sleeve and fixedly connected by glue. A threaded hole is provided on the outer wall of the connecting sleeve. The position of the threaded hole corresponds to the position of the annular groove. A threaded top column is provided in the threaded hole, and the end of the threaded top column extends into the annular groove on the outer wall of the optical fiber ferrule.

9. The SMA optical fiber connector according to claim 1, wherein: A retaining spring groove is further provided on the outer wall of the optical fiber ferrule, and a retaining spring for limiting the position of the nut connector is provided in the retaining spring groove.

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