Connecting piece for filling optical fiber

Abstract

The utility model provides a connecting piece for filling an optical fiber, which belongs to the technical field of optical fiber connecting pieces, and comprises a needle head fixing bolt, a communicating pipe and a fiber fixing bolt, the communicating pipe is of a tubular structure internally provided with a first internal thread and a second internal thread, and the first internal thread is in threaded connection with the needle head fixing bolt; the second internal thread is in threaded connection with the fiber fixing bolt, and the needle head fixing bolt and the fiber fixing bolt are coaxially arranged. According to the utility model, the trumpet-shaped port which can be opened and closed is matched with the trapezoidal piece, so that a very fine and soft tapering hollow-core optical fiber can be conveniently inserted when the trumpet-shaped port is opened, the tapering hollow-core optical fiber is stabilized when the trumpet-shaped port is closed, and the connection between the tapering hollow-core optical fiber and the sample injection needle head is realized; and the connection leakproofness is further improved through the arranged graphite gasket. The problems that when a hose and a wax seal are adopted for connection, sensitive materials are prone to leakage, cost is wasted, and pollution is caused are effectively solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical fiber connectors, and in particular relates to an optical fiber-filled connector. Background Art

[0002] As an emerging sensing technology, fiber optic sensors have the advantages of small size, light weight, high sensitivity, and long-distance transmission. They can work in complex environments such as high temperature, high pressure, and strong corrosion. They are favored in many fields such as medical care, aerospace, energy development, environmental monitoring, and industrial manufacturing. In the research of fiber optic sensors, the combination of fiber microstructures and sensitive materials can not only improve the performance of fiber optic sensors, but also broaden the application range of sensors.

[0003] At present, there are two typical methods for filling sensitive materials into optical fiber microstructures: filling by capillary effect or injection filling by optical fiber taper operation. It is difficult to achieve precise filling by capillary effect filling. In order to ensure precise filling, optical fiber taper operation is usually used for injection filling. However, in the operation of injection filling by optical fiber taper, since the aperture of the syringe end (outer diameter 6mm) is much larger than the aperture of the optical fiber (≤361µm), the connection between the two is usually connected by a hose. One end of the hose is tightly wrapped around the end of the syringe through the stretching action of the hose, and the other end of the hose is connected to the optical fiber tube through a wax seal. Since injection into the microstructure usually requires a large pressure, this often leads to leakage at the wax seal position. Especially for the more expensive filling sensitive materials, a lot of materials are wasted, which increases the research and development and preparation costs of optical fiber sensors, and the leaked filling sensitive materials also pollute the experimental environment.

[0004] Currently there is no suitable connector for optical fiber and syringe on the market. Utility Model Content

[0005] The utility model provides a connector for filling optical fiber, which aims to solve the problem that leakage is easily generated during filling by connecting the end of the syringe with the optical fiber through a hose and a wax seal in the existing operation of injection filling using an optical fiber taper.

[0006] Technical means:

[0007] The utility model provides a connector for filling optical fibers, comprising a needle fixing bolt, a connecting tube and a fiber fixing bolt.

[0008] The needle fixing bolt is a bolt structure with a first through hole penetrating through the central axis;

[0009] The connecting tube is a tubular structure having a first internal thread and a second internal thread arranged therein in sequence, the first internal thread is threadedly connected to the needle fixing bolt; the second internal thread is threadedly connected to the fiber fixing bolt, and the needle fixing bolt and the fiber fixing bolt are coaxially arranged;

[0010] The fiber fixing bolt comprises a fixing bolt cap, a fixing bolt rod, a clamping piece, a spring, a trapezoidal piece, a trumpet-shaped port and an annular cavity. The fixing bolt cap and the fixing bolt rod are integrally arranged to form a bolt structure. The fixing bolt rod is provided with an external thread on the outside, a second through hole is provided through the central axis of the fixing bolt rod, an annular cavity is provided inside the fixing bolt rod, and an inner wall between the annular cavity and the second through hole is a clamping piece. At the end away from the fixing bolt cap, the end of the clamping piece is integrally arranged with the end of the fixing bolt rod, and the other end of the clamping piece is arranged as a trumpet-shaped port that can be opened and closed. The trapezoidal piece is clamped between the trumpet-shaped port and the fixing bolt cap, and a spring is placed in the annular cavity. One end of the spring touches the trapezoidal piece, and the other end of the spring touches the inner wall of the end of the fixing bolt rod away from the fixing bolt cap.

[0011] Furthermore, the ends of the screw rod of the needle fixing bolt and the ends of the fixing bolt rod are both provided with fixing rings, and the fixing ring is an annular structure with a pair of arc-shaped clamping pieces at one end, and graphite gaskets are placed in the arc-shaped clamping pieces.

[0012] Furthermore, the trumpet-shaped port is a trumpet-shaped structure whose diameter gradually increases from the fixing bolt rod to the fixing bolt nut, the second through hole passes through the central axis, and the trumpet-shaped structure is divided into two or four equal parts along its radial direction.

[0013] Furthermore, the trapezoidal member is an annular structure whose diameter gradually decreases from the fixing bolt rod to the fixing bolt cap.

[0014] Furthermore, an external limiting piece is axially connected to an outer surface of the fixing bolt cap.

[0015] Furthermore, a pressing piece is provided on the outer surface of the trapezoidal piece.

[0016] Furthermore, the inner diameter of the first through hole is greater than the inner diameter of the second through hole.

[0017] Beneficial effects:

[0018] The utility model proposes a connector for filling optical fiber, which makes the injection needle and the tapered hollow-core optical fiber firmly and tightly connected. Through the cooperation of the designed trumpet-shaped port that can be opened and closed and the trapezoidal part, it is convenient to insert a very small and soft tapered hollow-core optical fiber when the trumpet-shaped port is opened, and the tapered hollow-core optical fiber is firmly connected when the trumpet-shaped port is closed, thus realizing the connection between the tapered hollow-core optical fiber and the injection needle; and the airtightness of the connection is further improved by the provided graphite gasket. It effectively solves the problem of sensitive material leakage, cost waste and pollution when using hoses and wax seals for connection.

[0019] Furthermore, the connecting tube, the needle fixing bolt and the fiber fixing bolt provided by the utility model are threadedly connected to each other, and the pressure generated during filling will not affect the stability of the connection between the three, and the three can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the external structure of the connector of the utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of the connector of the utility model;

[0022] Figure 3 Schematic diagram of the internal structure of the connecting pipe;

[0023] Figure 4 Schematic diagram of the needle fixing bolt structure;

[0024] Figure 5 This is a schematic diagram of the fiber fixing bolt structure;

[0025] Markings in the figure: 1. injection needle, 2. tapered hollow-core optical fiber, 3. needle fixing bolt, 31. first through hole, 4. connecting tube, 41. first internal thread, 42. second internal thread, 5. fiber fixing bolt, 51. fixing bolt cap, 52. fixing bolt rod, 521. second through hole, 53. clamping piece, 54. spring, 55. trapezoidal piece, 56. trumpet-shaped port, 57. annular cavity, 58. external limit piece, 59. pressing piece, 6. fixing ring, 61. arc-shaped clamping piece, 7. graphite gasket. DETAILED DESCRIPTION

[0026] The utility model will be described in further detail below in conjunction with the accompanying drawings.

[0027] like Figure 1 As shown, the utility model provides a connector for filling optical fiber, including a needle fixing bolt 3, a connecting tube 4 and a fiber fixing bolt 5, the two ends of the connecting tube 4 are respectively threadedly connected to the needle fixing bolt 3 and the fiber fixing bolt 5, and the needle fixing bolt 3 and the fiber fixing bolt 5 are coaxially arranged; the injection needle 1 of the syringe is inserted into the needle fixing bolt 3, the needle end of the injection needle 1 is a flat needle, and the other end can be directly sleeved on the syringe or tightly sleeved on the syringe through the stretching effect of the hose, and the syringe range can be any existing range. The tapered hollow-core optical fiber 2 is inserted into the fiber fixing bolt 5. The tapered hollow-core optical fiber 2 is a structure obtained by a tapered operation at one end, and the diameter of the end after the tapered operation gradually decreases. The end inserted into the fiber fixing bolt 5 does not undergo the tapered operation, and the end that undergoes the tapered operation is used to fill the inside of the microstructure.

[0028] like Figure 1 , Figure 2 and Figure 4 As shown, the needle fixing bolt 3 is a bolt structure with a first through hole 31 penetrating through the central axis; the injection needle 1 is inserted into the first through hole 31 and is gap-connected with the first through hole 31. A rubber ring is provided at the insertion end of the first through hole 31 to achieve a tight connection between the injection needle 1 and the needle fixing bolt 3. The injection needle 1 is inserted into the needle fixing bolt 3 to the end on the other side of the needle fixing bolt 3 and does not extend out. A fixing ring 6 is provided at the end of the needle fixing bolt 3 away from the bolt cap, and a pair of arc-shaped clamping members 61 are provided at the end of the fixing ring 6 away from the bolt cap. A graphite gasket 7 is placed in the arc-shaped clamping member 61 to further ensure the airtightness of the connection and avoid leakage of sensitive materials during filling.

[0029] like Figure 1 , Figure 2 and Figure 3 As shown, the connecting tube 4 is a tubular structure with a first internal thread 41 and a second internal thread 42 arranged in sequence inside. The first internal thread 41 is threadedly connected to the needle fixing bolt 3, and the thread lengths of the two are consistent; the second internal thread 42 is threadedly connected to the fiber fixing bolt 5, and the thread lengths of the two are consistent; when the connecting tube 4 is threadedly connected to the fiber fixing bolt 5, it is recommended to screw the connecting tube 4 to avoid damage to the end cone due to screwing of the longer tapered hollow-core optical fiber 2.

[0030] like Figure 1 , Figure 2 and Figure 5As shown, the fiber fixing bolt 5 includes a fixing bolt cap 51, a fixing bolt rod 52, a clamping member 53, a spring 54, a trapezoidal member 55, a trumpet-shaped port 56 and an annular cavity 57. The fixing bolt cap 51 is connected to the fixing bolt rod 52 to form a bolt structure. The fixing bolt rod 52 is provided with an external thread on the outside. A second through hole 521 is provided through the central axis of the fixing bolt rod 52. The second through hole 521 is used to insert the tapered hollow-core optical fiber 2. The diameter of the second through hole 521 matches the outer diameter (≤361µm) of the end of the tapered hollow-core optical fiber 2 that has not passed through the tapered part. Because the needle fixing bolt 3 is coaxially arranged with the fiber fixing bolt 5, when the needle fixing bolt 3, the connecting tube 4 and the fiber fixing bolt 5 are connected, the second through hole 521 and the first through hole 31 are located on the same axis, which ensures that the injection needle 1 and the tapered hollow-core optical fiber 2 are aligned and connected. A rubber pad is also provided on the inner wall of the second through hole 521 to facilitate more stable fixing of the tapered hollow-core optical fiber 2. An annular cavity 57 is provided inside the fixing bolt rod 52, and a clamping member 53 is formed between the annular cavity 57 and the second through hole 521. At the end away from the fixing bolt cap 51, the end of the clamping member 53 is integrally provided with the end of the fixing bolt rod 52. Since the tapered hollow-core optical fiber 2 is very small and soft, it is time-consuming and laborious to directly insert the tapered hollow-core optical fiber 2 into the second through hole 521, and it is also easy to be damaged. Therefore, the other end of the clamping member 53 is provided with a trumpet-shaped port 56 that can be opened and closed. The trumpet-shaped port 56 is an openable and closable structure whose diameter gradually increases from the fixing bolt rod 52 to the fixing bolt cap 51, and the second through hole 521 is passed through at the center axis, and the trumpet-shaped port 56 is cut into two or four equal parts along the radial direction. The trumpet-shaped port 56 is the insertion end of the tapered hollow-core optical fiber 2 into the second through hole 521. Since the diameter of the tapered hollow-core optical fiber 2 is extremely thin, in order to facilitate insertion, the trumpet-shaped port 56 is designed to be a structure that can be opened and closed in two or four equal parts. In order to facilitate the fixation and sealing of the tapered hollow-core optical fiber 2 inserted into the second through hole 521, a trapezoidal member 55 structure is designed. The trapezoidal member 55 is clamped between the trumpet-shaped port 56 and the fixing bolt cap 51. The trapezoidal member 55 is an annular structure with a diameter gradually decreasing from the fixing bolt rod 52 to the fixing bolt cap 51. Its two-dimensional perspective is a trapezoid, and its three-dimensional perspective is a trapezoid rotating around the axis. The trumpet-shaped port 56 is formed in a manner similar to an irregular circular ring, and its shape matches the edge of the trumpet-shaped port 56. The trumpet-shaped port 56 is pressed by the trapezoidal member 55 around it to limit the movement of the trumpet-shaped port 56. When it is fully sleeved with the trumpet-shaped port 56, the trumpet-shaped port 56 is in a closed state, and when it gradually moves away from the trumpet-shaped port 56, the trumpet-shaped port 56 is in an open and closed state. A spring 54 is placed in the annular cavity 57, that is, the spring 54 is sleeved on the clamping member 53, one end of the spring 54 touches the trapezoidal member 55, and the other end of the spring 54 touches the inner wall of the end of the fixing bolt rod 52 away from the fixing bolt cap 51.

[0031] The surrounding of the trapezoidal part 55 has been cut and is not connected to the fixing bolt cap 51. The fixing bolt cap 51 is provided with an external limiter 58. The external limiter 58 is a plate-like structure. One end of the plate is connected to the axis of the fixing bolt cap 51. By rotating the external limiter 58, the other end can contact the trapezoidal part 55, further preventing the trapezoidal part 55 from being ejected by the spring 54. At the same time, a cylindrical pressing part 59 is also integrated on the top of the trapezoidal part 55. The pressing part 59 presses the trapezoidal part 55 downward to move the trapezoidal part 55 downward, so that the horn-shaped port 56 is further pressed against the tapered hollow-core optical fiber 2 to ensure sealing.

[0032] The fiber fixing bolt 5 is the same as the needle fixing bolt 3. The end away from the fixing bolt cap 51 is provided with a graphite gasket fixing ring 6. In order to match the size of the tapered hollow-core optical fiber 2, the graphite gasket fixing ring 6 of the fiber fixing bolt 5 is smaller than that of the needle fixing bolt 3. Similarly, a smaller graphite gasket 7 is placed in the graphite gasket fixing ring 6 to ensure the sealing. After the connecting tube 4 connects the sampling needle 1 with the tapered hollow-core optical fiber 2, the tapered hollow-core optical fiber 2 will extend into a part of the sampling needle 1, and the flat-headed sampling needle 1 will touch the graphite gasket 7 of the graphite gasket fixing ring 6 of the fiber fixing bolt 5, thereby further realizing the airtightness of the connection, improving the efficiency of absorbing and filling sensitive materials, and avoiding leakage of sensitive materials.

[0033] When in use, the needle fixing bolt 3, the connecting tube 4 and the fiber fixing bolt 5 are threadedly connected, and the flat-headed injection needle 1 is inserted into the first through hole 31 of the needle fixing bolt 3; the fiber fixing bolt 5 is partially pressed by pressing the pressing member 59, and the spring 54 is compressed, and the trapezoidal member 55 moves downward. Since the trumpet-shaped port 56 has been cut, the opening end of the second through hole 521 will open, and the tapered hollow-core optical fiber 2 will be inserted into the opened trumpet-shaped port 56, and a part of the fiber fixing bolt 5 will be extended along the second through hole 521. The tapered hollow-core optical fiber 2 is not easily damaged during the insertion process. After the needle fixing bolt 3, the connecting tube 4 and the fiber fixing bolt 5 are connected, the extended part of the tapered hollow-core optical fiber 2 will enter the injection needle 1, and the length of the extended part of the tapered hollow-core optical fiber 2 can meet the requirements of entering the injection needle 1, and it is not too long, preferably between 2 and 10 mm. At this time, the pressing member 59 is released, and the trapezoidal member 55 is driven to rise by the restoring force of the spring 54 until it touches the external stopper 58. At this time, the trumpet-shaped port 56 is pressed by the trapezoidal member 55, and the tapered hollow-core optical fiber 2 is firmly sealed and fixed. After one filling is completed, by pressing the pressing member 59, the trumpet-shaped port 56 opens, and the used tapered hollow-core optical fiber 2 can be easily taken out to replace the new one. The operation is convenient, and the filling optical fiber connector and the injection needle 1 can be reused, saving costs.

[0034] In the existing method, the syringe port is directly connected to the tapered hollow-core optical fiber 2 through a hose, and the connection position needs to be wax-sealed. Since injection into the microstructure 1 requires a large pressure, the wax-sealed position often leaks due to excessive pressure, which not only wastes filling materials but also pollutes the experimental device. In the utility model, the syringe port is connected to the injection needle 1, and the syringe port and the injection needle 1 are tightly connected and will not separate due to injection pressure; or the syringe port is connected to the injection needle 1 through a hose. Since the connectors of the syringe port and the injection needle 1 are both structures with larger diameters, they can be tightly connected through the hose, and will not separate due to injection pressure; and in the utility model, the injection needle 1 and the tapered hollow-core optical fiber 2 are connected through a connecting tube 4, and wax sealing is not required, which solves the problem of leakage at the wax seal.

[0035] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A connector filled with optical fiber, characterized in that: It comprises a needle fixing bolt (3), a connecting pipe (4) and a fiber fixing bolt (5), The needle head fixing bolt (3) is a bolt structure having a first through hole (31) extending through the central axis; The connecting tube (4) is a tubular structure having a first internal thread (41) and a second internal thread (42) arranged therein in sequence, the first internal thread (41) being threadedly connected to the needle fixing bolt (3); the second internal thread (42) being threadedly connected to the fiber fixing bolt (5), and the needle fixing bolt (3) and the fiber fixing bolt (5) being coaxially arranged; The fiber fixing bolt (5) comprises a fixing bolt cap (51), a fixing bolt rod (52), a clamping member (53), a spring (54), a trapezoidal member (55), a trumpet-shaped port (56) and an annular cavity (57); the fixing bolt cap (51) and the fixing bolt rod (52) are integrally arranged to form a bolt structure; an external thread is arranged on the outside of the fixing bolt rod (52); a second through hole (521) is arranged through the central axis of the fixing bolt rod (52); an annular cavity (57) is arranged inside the fixing bolt rod (52); and the annular cavity (57) and the second through hole (521) are connected to each other. The inner wall between the through holes (521) is a clamping member (53). At one end away from the fixing bolt cap (51), the end of the clamping member (53) is integrally arranged with the end of the fixing bolt rod (52). The other end of the clamping member (53) is arranged as a trumpet-shaped port (56) that can be opened and closed. A trapezoidal member (55) is clamped between the trumpet-shaped port (56) and the fixing bolt cap (51). A spring (54) is placed in the annular cavity (57). One end of the spring (54) contacts the trapezoidal member (55), and the other end of the spring (54) contacts the inner wall of the end of the fixing bolt rod (52).

2. The optical fiber-filled connector according to claim 1, characterized in that: The ends of the screw rod of the needle head fixing bolt (3) and the ends of the fixing bolt rod (52) are both provided with fixing rings (6), and the fixing ring (6) is an annular structure with a pair of arc-shaped clamping members (61) provided at one end, and graphite gaskets (7) are placed in the arc-shaped clamping members (61).

3. The optical fiber-filled connector according to claim 1, characterized in that: The trumpet-shaped port (56) is a trumpet-shaped structure whose diameter gradually increases from the fixing bolt rod (52) to the fixing bolt cap (51), whose central axis passes through the second through hole (521), and which is divided into two or four equal parts along its radial direction.

4. The optical fiber-filled connector according to claim 1, characterized in that: The trapezoidal member (55) is an annular structure whose diameter gradually decreases in the direction from the fixing bolt rod (52) to the fixing bolt cap (51).

5. The optical fiber-filled connector according to claim 1, characterized in that: An external limiting member (58) is provided on the outer surface of the fixing bolt cap (51).

6. The optical fiber-filled connector according to claim 1, characterized in that: A pressing piece (59) is provided on the outer surface of the trapezoidal piece (55).

7. The optical fiber-filled connector according to claim 1, characterized in that: The inner diameter of the first through hole (31) is greater than the inner diameter of the second through hole (521).

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