Optical fiber sealing connector

Abstract

The present invention relates to an optical fiber sealing joint, comprising a first butt flange provided with a through hole, an interface seat and a second butt flange; a core plug assembly is provided in the through hole of the interface seat, and a bare optical fiber is provided in the center of the core plug assembly; the first butt flange is provided at one end of the interface seat, and the second butt flange is provided at the other end of the interface seat, one connection end of the core plug assembly extends into the through hole of the first butt flange, and the other connection end of the core plug assembly extends into the through hole of the second butt flange; a first sealing ring is provided on the outer sleeve of the core plug assembly, and a second sealing ring is provided on the interface seat; the second butt flange is fixedly provided in the opening of the sealing shell, and the interface seat is attached to the outside of the sealing shell. The optical fiber joint is connected to the first butt flange and the second butt flange, and the optical fiber joint can be coupled with the two connection ends to realize the lead-out of the optical fiber; the first sealing ring and the second sealing ring are used to prevent leakage between the optical fiber sealing joint and the sealing shell, thereby ensuring the sealing performance.

Description

Technical Field

[0001] The invention relates to the field of optical fiber sensing technology, and in particular to an optical fiber sealing joint. Background Art

[0002] Fiber optic sensing includes the perception and transmission of external signals. Perception means that the physical characteristic parameters of the light waves transmitted in the optical fiber, such as intensity, wavelength, frequency, phase and polarization state, change according to the law of change of external signals. Measuring the changes in optical parameters is to perceive the changes in external signals. Transmission means that the optical fiber transmits the light waves modulated by the external signal to the optical detector for detection. The external signal is extracted from the light wave and data is processed as needed, which is demodulation.

[0003] When using fiber optic sensing technology to measure the inside of a sealed device, it is necessary to first lead out the optical fiber inside the sealed device so that the light waves modulated by the external signal can be transmitted out through the optical fiber. How to ensure the sealing performance of the sealed device while leading out the optical fiber is an urgent problem that the industry needs to solve. Summary of the invention

[0004] In order to overcome the above-mentioned deficiencies of the prior art, the present invention proposes an optical fiber sealing joint, which can ensure the sealing performance of the sealing device while leading out the optical fiber.

[0005] The technical solution of the present invention to solve the above technical problem is as follows: an optical fiber sealing joint, comprising a first butt flange, an interface seat and a second butt flange, wherein the first butt flange, the interface seat and the second butt flange are all provided with through holes in the center;

[0006] A ferrule assembly is arranged in the through hole of the interface seat, both ends of the ferrule assembly are provided with connection ends, a microhole is arranged in the center of the ferrule assembly, and a bare optical fiber is arranged in the microhole through a sealant;

[0007] The first docking flange is arranged at one end of the interface seat, the second docking flange is arranged at the other end of the interface seat, one connecting end of the ferrule assembly extends into the through hole of the first docking flange, and the other connecting end of the ferrule assembly extends into the through hole of the second docking flange;

[0008] The outer sleeve of the ferrule assembly is provided with a first sealing ring, which is arranged between the ferrule assembly and the through hole of the interface seat; the interface seat is provided with a circular groove at one end close to the second docking flange, and a second sealing ring is arranged in the circular groove;

[0009] The second docking flange is fixedly arranged in the opening of the sealing shell, and the interface seat is attached to the outside of the sealing shell through one end close to the second docking flange.

[0010] Compared with the prior art, the beneficial effects of the present technical solution are as follows: the optical fiber connector is connected to the first docking flange and the second docking flange, and the optical fiber connector can be coupled with the two connecting ends of the core assembly to realize the lead-out of the optical fiber; the first sealing ring is used to prevent leakage between the core assembly and the through hole of the interface seat, and the second sealing ring is used to prevent leakage between the interface seat and the sealing shell, thereby ensuring the sealing performance of the sealing device.

[0011] Furthermore, a fixing sleeve is provided in the through hole of the interface seat;

[0012] The ferrule assembly includes a first ceramic ferrule and a second ceramic ferrule, the tail end of the first ceramic ferrule and the tail end of the second ceramic ferrule abut against each other and are fixedly arranged in the fixed sleeve, the connecting end of the first ceramic ferrule extends into the through hole of the first docking flange, and the connecting end of the second ceramic ferrule extends into the through hole of the second docking flange.

[0013] The beneficial effect of adopting the above technical solution is that the first ceramic ferrule and the second ceramic ferrule are standard parts, and the two ends are respectively a tail end and a connection end. After the tail end of the first ceramic ferrule is abutted against the tail end of the second ceramic ferrule, the first ceramic ferrule and the second ceramic ferrule are fixedly arranged in a fixed sleeve, and there is no need to open a mold to make a special ferrule assembly. A ferrule assembly with two connection ends can be obtained by using two standard ceramic ferrules, which can effectively reduce the manufacturing cost.

[0014] Furthermore, it also includes a first flange seat and a second flange seat, wherein the first flange seat and the second flange seat are both provided with a through hole in the center;

[0015] The first flange seat is arranged between the first docking flange and the interface seat, and the second flange seat is arranged between the second docking flange and the interface seat;

[0016] The connection end of the first ceramic ferrule passes through the through hole of the first flange seat and extends into the through hole of the first docking flange. The connection end of the second ceramic ferrule passes through the through hole of the second flange seat and extends into the through hole of the second docking flange.

[0017] The beneficial effect of adopting the above technical solution is: since the length of the standard part of the ceramic ferrule is 10.5 mm, by setting the first flange seat and the second flange seat, the lengths of the first ceramic ferrule and the second ceramic ferrule can be matched, so that the connecting end of the first ceramic ferrule extends into the through hole of the first docking flange, and the connecting end of the second ceramic ferrule extends into the through hole of the second docking flange, which is convenient for coupling with the connected optical fiber connector.

[0018] Furthermore, the first docking flange and the first flange seat are fixedly arranged at one end of the interface seat by means of screws, and the second docking flange and the second flange seat are fixedly arranged at the other end of the interface seat by means of screws.

[0019] The beneficial effect of adopting the above technical solution is that it has the advantage of easy installation.

[0020] Furthermore, the second flange seat is provided with an external thread matched with the opening of the sealing housing, and the second flange seat is detachably arranged on the sealing housing through the external thread.

[0021] The beneficial effect of adopting the above technical solution is: an internal thread is pre-opened on the opening of the sealing shell. When the optical fiber sealing joint is installed on the sealing shell, it is only necessary to screw the second flange seat into the opening of the sealing shell through the external thread to conveniently complete the installation of the optical fiber sealing joint.

[0022] Furthermore, the through hole in the interface seat includes a truncated cone through hole, a first cylindrical through hole and a second cylindrical through hole;

[0023] The upper bottom radius of the truncated cone through hole is greater than the lower bottom radius, the bottom radius of the first cylindrical through hole is equal to the lower bottom radius of the truncated cone through hole, the bottom radius of the second cylindrical through hole is smaller than the bottom radius of the first cylindrical through hole, and the first cylindrical through hole and the second cylindrical through hole form a step surface at the transition;

[0024] The fixing sleeve is sleeved in the first cylindrical through hole, the height of the fixing sleeve is the same as the height of the first cylindrical through hole, and the first sealing ring is arranged in the truncated cone through hole;

[0025] One end of the fixed sleeve sleeve abuts against the step surface, and the other end of the fixed sleeve sleeve abuts against the first sealing ring.

[0026] The beneficial effects of adopting the above technical solution are: on the one hand, a step surface is formed at the transition between the first cylindrical through hole and the second cylindrical through hole, which is convenient for fixing the fixing sleeve in the first cylindrical through hole, thereby making the structure of the first ceramic ferrule and the second ceramic ferrule more stable; on the other hand, the truncated cone through hole reserves deformation space for the first sealing ring. When the first sealing ring is pressed by the first docking flange or the first flange seat, the first sealing ring will deform and fill the gap between the through hole of the interface seat and the first ceramic ferrule, thereby ensuring the sealing performance of the optical fiber sealing joint.

[0027] Furthermore, a first guide sleeve is provided in the through hole of the first docking flange and the first flange seat, and the first ceramic ferrule is sleeved in the first guide sleeve; a second guide sleeve is provided in the through hole of the second docking flange and the second flange seat, and the second ceramic ferrule is sleeved in the second guide sleeve.

[0028] The beneficial effect of adopting the above technical solution is that when the optical fiber connector is connected to the first docking flange, the first guide sleeve will limit the position of the optical fiber connector and guide the optical fiber connector to the first ceramic ferrule; similarly, when the optical fiber connector is connected to the second docking flange, the second guide sleeve will limit the position of the optical fiber connector and guide the optical fiber connector to the second ceramic ferrule. Therefore, by providing the first guide sleeve and the second guide sleeve, it is possible to ensure smooth coupling between the optical fiber connector and the first ceramic ferrule or the second ceramic ferrule, which is conducive to transmitting the light waves carrying information in the sealed housing.

[0029] Furthermore, a first positioning seat is provided in the through hole of the first docking flange, and the first positioning seat is sleeved outside the first guide sleeve; a second positioning seat is provided in the through hole of the second docking flange, and the second positioning seat is sleeved outside the second guide sleeve.

[0030] The beneficial effect of adopting the above technical solution is that the first positioning seat is arranged in the gap between the first docking flange and the first guide sleeve, and the second positioning seat is arranged in the gap between the second docking flange and the second guide sleeve. Therefore, the first positioning seat and the second positioning seat can ensure that the first guide sleeve and the second guide sleeve will not swing left and right during the process of connecting the optical fiber connector, and also facilitate the smooth coupling between the optical fiber connector and the first ceramic ferrule or the second ceramic ferrule.

[0031] Furthermore, the first positioning seat and the second positioning seat have the same shape and structure, and the first positioning seat and the second positioning seat include a first positioning seat ring and a positioning seat round tube, and one end of the positioning seat round tube is fixedly arranged on the inner diameter of the first positioning seat ring;

[0032] The first docking flange is provided with an annular mounting platform on a side close to the first flange seat, and the second docking flange is provided with an annular mounting platform on a side close to the second flange seat. The first positioning seat is fixedly arranged in the first docking flange by embedding the first circular ring of the positioning seat into the annular mounting platform, and the second positioning seat is fixedly arranged in the second docking flange by embedding the first circular ring of the positioning seat into the annular mounting platform.

[0033] The beneficial effect of adopting the above technical solution is that the first circular ring of the positioning seat is clamped in the annular mounting platform, so that the first positioning seat can be better fixed on the first docking flange and the second positioning seat can be better fixed on the second docking flange.

[0034] Furthermore, the first positioning seat and the second positioning seat further include a second positioning seat ring, and one end of the positioning seat tube away from the first positioning seat ring is fixedly arranged on the outer diameter of the second positioning seat ring;

[0035] The first guide sleeve or the second guide sleeve passes through the positioning seat circular tube and then abuts against the second circular ring of the positioning seat.

[0036] The beneficial effect of adopting the above technical solution is that the first guide sleeve and the second guide sleeve abut against the second circular ring of the positioning seat after passing through the positioning seat circular tube, so that the first positioning seat can better fix the first guide sleeve, and the second positioning seat can also better fix the second guide sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of a first embodiment of an optical fiber sealing joint of the present invention;

[0038] Figure 2 It is an exploded view of a first embodiment of an optical fiber sealing joint of the present invention;

[0039] Figure 3 It is a schematic diagram of a second embodiment of an optical fiber sealing joint of the present invention;

[0040] Figure 4 It is an exploded view of a second embodiment of an optical fiber sealing joint of the present invention;

[0041] Figure 5 A schematic diagram of an interface seat in an optical fiber sealing joint of the present invention;

[0042] Figure 6 It is a schematic diagram of a ferrule assembly in an optical fiber sealing joint of the present invention;

[0043] Figure 7 The present invention is a schematic diagram of a first butt flange, a first guide sleeve and a first positioning seat in an optical fiber sealing joint. DETAILED DESCRIPTION

[0044] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0045] like Figure 1 and Figure 2 As shown, a fiber optic sealing joint comprises a first butt flange 1, an interface seat 2 and a second butt flange 3, wherein the first butt flange 1, the interface seat 2 and the second butt flange 3 are all centrally provided with through holes. The through holes on the first butt flange 1, the interface seat 2 and the second butt flange 3 are coaxially arranged.

[0046] In the optical fiber sealing joint, the first docking flange 1 and the second docking flange 3 are used to plug the optical fiber joint, and the function of the interface seat 2 is to provide support for the first docking flange 1 and the second docking flange 3 and other components. The optical fiber joint is a device in the prior art, and is provided with a structure similar to the connecting end of the core assembly 4. When the optical fiber joint and the connecting end of the core assembly 4 are docked and coupled, optical signal transmission can be achieved between the core assembly 4 and the optical fiber joint connected to the outside. Specifically, the optical fiber joint is a physical interface used to connect optical fiber cables, and there are usually several types such as SC connectors, ST connectors and FC connectors. In the present invention, the optical fiber joints suitable for the first docking flange 1 and the second docking flange 3 are ST connectors and FC connectors.

[0047] The through hole of the interface seat 2 is provided with a core assembly 4, both ends of the core assembly 4 are provided with connection ends, a microhole is provided in the center of the core assembly 4, and a bare optical fiber 41 is provided in the microhole through a sealant. It should be noted that a glue-dispensing sealing ring is also provided between the microhole and the bare optical fiber 41, that is, the gap between the microhole and the bare optical fiber 41 is filled by dispensing glue, so that the bare optical fiber 41 can be fixed in the microhole, and the sealing can be achieved to prevent leakage from between the microhole and the bare optical fiber 41. Specifically, the glue dispensed is 353ND glue.

[0048] The ferrule assembly 4 is provided with a bare optical fiber 41, and both ends of the bare optical fiber 41 are respectively provided on the two connecting ends of the ferrule assembly 4. When the external optical fiber connector is coupled with the connecting end of the ferrule assembly 4, the bare optical fiber 41 in the ferrule assembly 4 is connected with the optical fiber connector.

[0049] The first docking flange 1 is arranged at one end of the interface seat 2, and the second docking flange 3 is arranged at the other end of the interface seat 2. After the assembly is completed, one connection end of the ferrule assembly 4 extends into the through hole of the first docking flange 1, and the other connection end of the ferrule assembly 4 extends into the through hole of the second docking flange 3. It is only necessary to connect the optical fiber connector to the first docking flange 1 and the second docking flange 3, and the optical fiber connector can be coupled with the connection end of the ferrule assembly 4 extending into the through holes of the first docking flange 1 and the second docking flange 3, so as to realize the extraction of optical fiber in the sealed housing and the transmission of optical signals in the sealed housing.

[0050] When the optical fiber sealing connector is installed on the sealing housing, the second docking flange 3 is fixedly arranged in the opening of the sealing housing, and the interface seat 2 is attached to the outside of the sealing housing through one end close to the second docking flange 3. Figure 1As shown, the interface seat 2 is provided with a threaded through hole, the sealing housing is provided with an internal threaded hole, and the bolt passes through the threaded through hole on the interface seat 2 and is threadedly connected with the internal threaded hole on the sealing housing, thereby realizing the optical fiber sealing joint being arranged on the sealing housing. Of course, other methods can also be used to install the optical fiber sealing joint on the sealing housing.

[0051] In order to prevent leakage of the sealed housing due to the gap between the through hole of the interface seat 2 and the ferrule assembly 4, a first sealing ring 5 is provided on the outer sleeve of the ferrule assembly 4, and the first sealing ring 5 is arranged between the ferrule assembly 4 and the through hole of the interface seat 2. Similarly, in order to prevent leakage between the interface seat 2 and the sealed housing, the interface seat 2 is provided with a circular groove 21 at one end close to the second docking flange 3, and a second sealing ring 6 is arranged in the circular groove 21.

[0052] like Figure 1 and Figure 2 As shown, in the first embodiment, the ferrule assembly 4 is first fixedly arranged in the through hole of the interface seat 2, and then the first docking flange 1 and the second docking flange 3 are fixedly installed at both ends of the interface seat 2, and one connecting end of the ferrule assembly 4 is extended into the through hole of the first docking flange 1, and the other connecting end is extended into the through hole of the second docking flange 3, thereby completing the assembly of the optical fiber sealing joint. After the optical fiber sealing joint is assembled, the optical fiber joint in the sealing housing is coupled with the second docking flange 3, and then the second docking flange 3 is installed at the opening of the sealing housing. The interface seat 2 presses the second sealing ring 6 against the surface of the sealing housing, which can effectively prevent leakage between the interface seat 2 and the sealing housing. After the optical fiber sealing joint is installed on the sealing housing, the external optical fiber joint is coupled with the first docking flange 1, and the optical fiber in the sealing housing can be led out.

[0053] Specifically, the first docking flange 1 and the second docking flange 3 have the same shape and structure. The first docking flange 1 and the second docking flange 3 include a docking flange base and a docking flange round tube. One end of the docking flange round tube is fixedly arranged on the inner diameter of the docking flange base. When the optical fiber connector is connected to the first docking flange 1 or the second docking flange 3, the optical fiber connector can be inserted into the docking flange round tube and coupled with the connecting end of the ferrule assembly 4. It should be noted that the structure of the first docking flange 1 and the second docking flange 3 is actually a corresponding setting made to adapt to the optical fiber connector in the prior art, and its purpose is to better connect the optical fiber connector.

[0054] Specifically, if Figure 1As shown, the first docking flange 1 is fixedly arranged at one end of the interface seat 2 by a screw, and the second docking flange 3 is fixedly arranged at the other end of the interface seat 2 by a screw. Through holes are arranged on the first docking flange 1 and the second docking flange 3, and internal threaded holes are arranged at both ends of the interface seat 2. After the screw passes through the first docking flange 1, it is threadedly connected with the internal threaded hole at one end of the interface seat 2, and the first docking flange 1 is fixed to one end of the interface seat 2; after the screw passes through the second docking flange 3, it is threadedly connected with the internal threaded hole at the other end of the interface seat 2, and the second docking flange 3 is fixed to the other end of the interface seat 2.

[0055] Preferably, a fixing sleeve 7 is provided in the through hole of the interface seat 2; Figure 6 As shown, the ferrule assembly 4 includes a first ceramic ferrule 42 and a second ceramic ferrule 43. The tail end of the first ceramic ferrule 42 and the tail end of the second ceramic ferrule are abutted against each other and fixedly arranged in the fixing sleeve 7, the connecting end of the first ceramic ferrule 42 extends into the through hole of the first docking flange 1, and the connecting end of the second ceramic ferrule 43 extends into the through hole of the second docking flange 3.

[0056] The function of the ferrule assembly 4 is to couple with the optical fiber connector through the connecting ends at both ends, so as to lead out the optical fiber in the sealed housing. A ferrule assembly 4 with connecting ends at both ends is made, and then a bare optical fiber 41 is placed in the ferrule assembly 4, and the two ends of the bare optical fiber 41 are respectively arranged on the two connecting ends of the ferrule assembly 4, so as to achieve coupling with the optical fiber connector. There is no ferrule assembly 4 with two connecting ends on the market, so such a ferrule assembly 4 has the problem of too high manufacturing cost, and it is necessary to open a mold to make the ferrule assembly 4 separately.

[0057] Correspondingly, the ferrule assembly 4 can be synthesized by the first ceramic ferrule 42 and the second ceramic ferrule 43, wherein the first ceramic ferrule 42 and the second ceramic ferrule 43 are standard parts, thereby reducing the manufacturing cost. The first ceramic ferrule 42 and the second ceramic ferrule 43 as standard parts both have a tail end and a connection end, and the tail end of the first ceramic ferrule 42 and the tail end of the second ceramic ferrule are abutted against each other and fixedly arranged in the fixed sleeve 7, so as to synthesize a ferrule assembly 4. Among them, a microhole is arranged in the center of the first ceramic ferrule 42 and the second ceramic ferrule 43, and a bare optical fiber 41 is arranged in the microhole through a sealant.

[0058] Specifically, Figure 1As shown, in the first embodiment, the first sealing ring 5 is sleeved outside the ferrule assembly 4 and is arranged below the fixed sleeve 7. During specific assembly, after the ferrule assembly 4 is fixed in the fixed sleeve 7, the first sealing ring 5 is inserted from the bottom of the ferrule assembly 4, and then the ferrule assembly 4 is placed in the through hole of the interface seat 2. In this way, the fixed sleeve 7 will press the first sealing ring 5 on the interface seat 2, so that the first sealing ring 5 fills the gap between the interface seat 2 and the first ceramic ferrule 42, thereby achieving sealing.

[0059] Since the first ceramic ferrule 42 and the second ceramic ferrule 43 are standard parts, the lengths of both are 10.5 mm. When the ferrule assembly 4 is synthesized by the first ceramic ferrule 42 and the second ceramic ferrule 43, in order to adapt to the sizes of the first ceramic ferrule 42 and the second ceramic ferrule 43, the connecting end of the first ceramic ferrule 42 extends into the through hole of the first docking flange 1 and the connecting end of the second ceramic ferrule 43 extends into the through hole of the second docking flange 3, and a first flange seat 8 and a second flange seat 9 are also provided.

[0060] like Figure 3 and Figure 4 As shown, in the second embodiment, the optical fiber sealing joint includes a first butt flange 1, an interface seat 2, a second butt flange 3, a core assembly 4, a fixing sleeve 7, a first sealing ring 5 and a second sealing ring 6, and also includes a first flange seat 8 and a second flange seat 9. Among them, the structures of the first butt flange 1, the interface seat 2, the second butt flange 3, the core assembly 4, the fixing sleeve 7, the first sealing ring 5 and the second sealing ring 6 are the same as those in the first embodiment, and will not be described in detail here. The structural features of the first flange seat 8 and the second flange seat 9 in the optical fiber sealing joint are described below.

[0061] A fiber optic sealing joint also includes a first flange seat 8 and a second flange seat 9, wherein the first flange seat 8 and the second flange seat 9 are both provided with through holes in the center; the first flange seat 8 is arranged between the first docking flange 1 and the interface seat 2, and the second flange seat 9 is arranged between the second docking flange 3 and the interface seat 2.

[0062] The connection end of the first ceramic ferrule 42 extends through the through hole of the first flange seat 8 into the through hole of the first docking flange 1, and the connection end of the second ceramic ferrule 43 extends through the through hole of the second flange seat 9 into the through hole of the second docking flange 3. Since the length of the standard ceramic ferrule is 10.5 mm, by setting the first flange seat 8 and the second flange seat 9, the lengths of the first ceramic ferrule 42 and the second ceramic ferrule 43 can be matched, so that the connection end of the first ceramic ferrule 42 extends into the through hole of the first docking flange 1, and the connection end of the second ceramic ferrule 43 extends into the through hole of the second docking flange 3, which is convenient for coupling with the connected optical fiber connector.

[0063] Specifically, if Figure 3 As shown, the first docking flange 1 and the first flange seat 8 are fixedly arranged at one end of the interface seat 2 by screws, and the second docking flange 3 and the second flange seat 9 are fixedly arranged at the other end of the interface seat 2 by screws. The first docking flange 1, the second docking flange 3, the first flange seat 8 and the second flange seat 9 are all provided with threaded through holes, and internal threaded holes are respectively provided at both ends of the interface seat 2. After the screw passes through the first docking flange 1 and the first flange seat 8 in sequence, it is threadedly connected with the internal threaded hole at one end of the interface seat 2, and the first docking flange 1 and the first flange seat 8 are fixed at one end of the interface seat 2; after the screw passes through the second docking flange 3 and the second flange seat 9 in sequence, it is threadedly connected with the internal threaded hole at the other end of the interface seat 2, and the second docking flange 3 and the second flange seat 9 are fixed at the other end of the interface seat 2.

[0064] Preferably, the second flange seat 9 is provided with an external thread that matches the opening of the sealing housing, and the second flange seat 9 is detachably arranged on the sealing housing through the external thread, and the sealing housing is provided with an opening with an internal thread. The optical fiber sealing connector is arranged on the sealing housing by screwing the second flange seat 9 into the opening, which has the advantage of convenient assembly and disassembly.

[0065] Different from the first embodiment in which the first sealing ring 5 is arranged below the fixing sleeve 7 , in the second embodiment, the first sealing ring 5 is arranged above the fixing sleeve 7 .

[0066] like Figure 5 As shown, the through holes in the interface seat 2 include a truncated cone through hole 22 , a first cylindrical through hole 23 and a second cylindrical through hole 24 .

[0067] The upper base radius of the truncated cone through hole 22 is larger than the lower base radius, the bottom radius of the first cylindrical through hole 23 is equal to the lower bottom radius of the truncated cone through hole 22, the bottom radius of the second cylindrical through hole 24 is smaller than the bottom radius of the first cylindrical through hole 23, and the first cylindrical through hole 23 and the second cylindrical through hole 24 form a step surface at the transition.

[0068] The fixed sleeve 7 is sleeved in the first cylindrical through hole 23, and the height of the fixed sleeve 7 is the same as the height of the first cylindrical through hole 23. The first sealing ring 5 is arranged in the truncated cone through hole 22; one end of the fixed sleeve 7 abuts on the step surface, and the other end of the fixed sleeve 7 abuts on the first sealing ring 5.

[0069] During specific assembly, after the ferrule assembly 4 consisting of the first ceramic ferrule 42 and the second ceramic ferrule 43 is fixed in the fixing sleeve 7, the ferrule assembly 4 is placed in the through hole of the interface seat 2, and the lower end of the fixing sleeve 7 will abut against the step surface; then the first sealing ring 5 is inserted from the top of the ferrule assembly 4, and the first sealing ring 5 abuts against the side surface of the truncated cone through hole 22; then the first flange seat 8 is installed on the upper end of the interface seat 2, and the first flange seat 8 squeezes the first sealing ring 5, so that the first sealing ring 5 fills the gap between the interface seat 2 and the first ceramic ferrule 42, thereby achieving sealing.

[0070] Preferably, in the first embodiment, as Figure 1 As shown, a first guide sleeve 44 is further provided in the through hole of the first docking flange 1, and one end of the ferrule assembly 4 is sleeved in the first guide sleeve 44; a second guide sleeve 45 is further provided in the through hole of the second docking flange 3, and the other end of the ferrule assembly 4 is sleeved in the second guide sleeve 45. In the second embodiment, as Figure 3 As shown, a first guide sleeve 44 is further provided in the through hole of the first docking flange 1 and the first flange seat 8, and the first ceramic ferrule 42 is sleeved in the first guide sleeve 44; a second guide sleeve 45 is further provided in the through hole of the second docking flange 3 and the second flange seat 9, and the second ceramic ferrule 43 is sleeved in the second guide sleeve 45.

[0071] When the optical fiber connector is connected to the first docking flange 1, the first guide sleeve 44 will limit the position of the optical fiber connector and guide the optical fiber connector to the first ceramic ferrule 42; similarly, when the optical fiber connector is connected to the second docking flange 3, the second guide sleeve 45 will limit the position of the optical fiber connector and guide the optical fiber connector to the second ceramic ferrule 43. Therefore, by providing the first guide sleeve 44 and the second guide sleeve 45, it is possible to ensure smooth coupling between the optical fiber connector and the first ceramic ferrule 42 or the second ceramic ferrule 43, which is conducive to transmitting the light waves carrying information in the sealed housing.

[0072] It should be noted that the first docking flange 1 and the second docking flange 3 have the same shape and structure, the first guide sleeve 44 and the second guide sleeve 45 have the same shape and structure, and the first positioning seat 46 and the second positioning seat 47 have the same shape and structure. Therefore, only the first docking flange 1, the first guide sleeve 44 and the first positioning seat 46 are taken as examples here, and the specific structure and matching relationship of the second docking flange 3, the second guide sleeve 45 and the second positioning seat 47 refer to the specific structure and matching relationship of the first docking flange 1, the first guide sleeve 44 and the first positioning seat 46.

[0073] Preferably, if Figure 7 As shown, Figure 7The figure is a schematic diagram of a first docking flange 1, a first guide sleeve 44 and a first positioning seat 46 in an optical fiber sealing joint of the present invention. A first positioning seat 46 is also provided in the through hole of the first docking flange 1, and the first positioning seat 46 is sleeved outside the first guide sleeve 44; a second positioning seat 47 is also provided in the through hole of the second docking flange 3, and the second positioning seat 47 is sleeved outside the second guide sleeve 45.

[0074] Specifically, the first positioning seat 46 and the second positioning seat 47 include a first positioning seat ring 461, a positioning seat tube 462 and a second positioning seat ring 463, one end of the positioning seat tube 462 is fixedly set on the inner diameter of the first positioning seat ring 461, and the other end of the positioning seat tube 462 is fixedly set on the outer diameter of the second positioning seat ring 463.

[0075] The first docking flange 1 is provided with an annular mounting platform 11 on a side close to the first flange seat 8, and the second docking flange 3 is provided with an annular mounting platform 11 on a side close to the second flange seat 9. The first positioning seat 46 is fixedly set in the first docking flange 1 by embedding the first circular ring 461 of the positioning seat into the annular mounting platform 11, and the second positioning seat 47 is fixedly set in the second docking flange 3 by embedding the first circular ring 461 of the positioning seat into the annular mounting platform 11.

[0076] The first guide sleeve 44 or the second guide sleeve 45 passes through the positioning seat circular tube 462 and then abuts against the second circular ring 463 of the positioning seat.

[0077] During specific assembly, first, respectively sleeve the first guide sleeve 44 and the second guide sleeve 45 on the two ends of the insert assembly 4, then sleeve the first positioning seat 46 on the first guide sleeve 44, so that the upper end of the first guide sleeve 44 abuts against the second circular ring 463 of the positioning seat, and then sleeve the first docking flange 1 on the first positioning seat 46; correspondingly, sleeve the second positioning seat 47 on the second guide sleeve 45, so that the upper end of the second guide sleeve 45 abuts against the second circular ring 463 of the positioning seat, and then sleeve the second docking flange 3 on the second positioning seat 47.

[0078] In summary, the optical fiber connector is connected to the first docking flange 1 and the second docking flange 3, and the optical fiber connector can be coupled with the two connecting ends of the ferrule assembly 4 to realize the optical fiber lead-out; the first sealing ring is used to prevent leakage between the ferrule assembly 4 and the through hole of the interface seat 2, and the second sealing ring 6 is used to prevent leakage between the interface seat 2 and the sealing shell, thereby ensuring the sealing performance of the sealing device. Through the above technical solution, the modularization of the sealing shell is realized, and there is no need for a special sealing shell. Only an opening needs to be reserved on the sealing shell to ensure the sealing performance of the sealing device while leading out the optical fiber.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An optical fiber sealing joint, characterized in that: It comprises a first docking flange (1), an interface seat (2) and a second docking flange (3), wherein the first docking flange (1), the interface seat (2) and the second docking flange (3) are all provided with through holes in the center thereof; A ferrule assembly (4) is arranged in the through hole of the interface seat (2), both ends of the ferrule assembly (4) are provided with connection ends, a microhole is arranged in the center of the ferrule assembly (4), and a bare optical fiber (41) is arranged in the microhole through a sealant; The first docking flange (1) is arranged at one end of the interface seat (2), the second docking flange (3) is arranged at the other end of the interface seat (2), one connecting end of the ferrule assembly (4) extends into the through hole of the first docking flange (1), and the other connecting end of the ferrule assembly (4) extends into the through hole of the second docking flange (3); The outer sleeve of the ferrule assembly (4) is provided with a first sealing ring (5), and the first sealing ring (5) is arranged between the ferrule assembly (4) and the through hole of the interface seat (2); the interface seat (2) is provided with an annular groove (21) at one end close to the second docking flange (3), and a second sealing ring (6) is arranged in the annular groove (21); The second docking flange (3) is fixedly arranged in the opening of the sealing housing, and the interface seat (2) is attached to the outside of the sealing housing through an end close to the second docking flange (3); A fixing sleeve (7) is arranged in the through hole of the interface seat (2); The ferrule assembly (4) comprises a first ceramic ferrule (42) and a second ceramic ferrule (43); the tail end of the first ceramic ferrule (42) and the tail end of the second ceramic ferrule (43) are in contact with each other and are fixedly arranged in the fixed sleeve (7); the connecting end of the first ceramic ferrule (42) extends into the through hole of the first docking flange (1); and the connecting end of the second ceramic ferrule (43) extends into the through hole of the second docking flange (3).

2. The optical fiber sealing joint according to claim 1, characterized in that: It also comprises a first flange seat (8) and a second flange seat (9), wherein the first flange seat (8) and the second flange seat (9) are both provided with a through hole at the center; The first flange seat (8) is arranged between the first docking flange (1) and the interface seat (2), and the second flange seat (9) is arranged between the second docking flange (3) and the interface seat (2); The connection end of the first ceramic ferrule (42) extends through the through hole of the first flange seat (8) into the through hole of the first mating flange (1), and the connection end of the second ceramic ferrule (43) extends through the through hole of the second flange seat (9) into the through hole of the second mating flange (3).

3. The optical fiber sealing joint according to claim 2, characterized in that: The first docking flange (1) and the first flange seat (8) are fixedly arranged at one end of the interface seat (2) by means of screws, and the second docking flange (3) and the second flange seat (9) are fixedly arranged at the other end of the interface seat (2) by means of screws.

4. The optical fiber sealing joint according to claim 2, characterized in that: The second flange seat (9) is provided with an external thread that matches with the opening of the sealing housing, and the second flange seat (9) is detachably arranged on the sealing housing via the external thread.

5. The optical fiber sealing joint according to claim 2, characterized in that: The through holes in the interface seat (2) include a truncated cone through hole (22), a first cylindrical through hole (23) and a second cylindrical through hole (24); The upper bottom radius of the truncated cone through hole (22) is greater than the lower bottom radius, the bottom radius of the first cylindrical through hole (23) is equal to the lower bottom radius of the truncated cone through hole (22), the bottom radius of the second cylindrical through hole (24) is smaller than the bottom radius of the first cylindrical through hole (23), and the first cylindrical through hole (23) and the second cylindrical through hole (24) form a step surface at the transition point; The fixed sleeve (7) is sleeved in the first cylindrical through hole (23), the height of the fixed sleeve (7) is the same as the height of the first cylindrical through hole (23), and the first sealing ring (5) is arranged in the truncated cone through hole (22); One end of the fixed sleeve (7) abuts against the step surface, and the other end of the fixed sleeve (7) abuts against the first sealing ring (5).

6. The optical fiber sealing joint according to claim 2, characterized in that: A first guide sleeve (44) is further provided in the through hole of the first mating flange (1) and the first flange seat (8), and the first ceramic ferrule (42) is sleeved in the first guide sleeve (44); a second guide sleeve (45) is further provided in the through hole of the second mating flange (3) and the second flange seat (9), and the second ceramic ferrule (43) is sleeved in the second guide sleeve (45).

7. The optical fiber sealing joint according to claim 6, characterized in that: A first positioning seat (46) is also provided in the through hole of the first docking flange (1), and the first positioning seat (46) is sleeved outside the first guide sleeve (44); a second positioning seat (47) is also provided in the through hole of the second docking flange (3), and the second positioning seat (47) is sleeved outside the second guide sleeve (45).

8. The optical fiber sealing joint according to claim 7, characterized in that: The first positioning seat (46) and the second positioning seat (47) have the same shape and structure. The first positioning seat (46) and the second positioning seat (47) comprise a first positioning seat ring (461) and a positioning seat circular tube (462). One end of the positioning seat circular tube (462) is fixedly arranged on the inner diameter of the first positioning seat ring (461). The first docking flange (1) is provided with an annular mounting platform (11) on a side close to the first flange seat (8), and the second docking flange (3) is provided with an annular mounting platform (11) on a side close to the second flange seat (9). The first positioning seat (46) is fixedly arranged in the first docking flange (1) by embedding the first circular ring (461) of the positioning seat into the annular mounting platform (11), and the second positioning seat (47) is fixedly arranged in the second docking flange (3) by embedding the first circular ring (461) of the positioning seat into the annular mounting platform (11).

9. The optical fiber sealing joint according to claim 8, characterized in that: The first positioning seat (46) and the second positioning seat (47) further include a positioning seat second circular ring (463), and one end of the positioning seat circular tube (462) away from the positioning seat first circular ring (461) is fixedly arranged on the outer diameter of the positioning seat second circular ring (463); The first guide sleeve (44) or the second guide sleeve (45) passes through the positioning seat circular tube (462) and then abuts against the positioning seat second circular ring (463).

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