Optical fiber connector and inner core assembly thereof

Abstract

The utility model belongs to the technical field of optical fibers, and particularly discloses an optical fiber connector and an inner core assembly thereof, the inner core assembly comprises an insertion core component, a supporting body and an elastic element, the insertion core component is used for penetrating through an optical cable, and the insertion core component is movably connected with the supporting body in a limiting mode so that the insertion core component can move relative to the supporting body in the axial direction and / or the circumferential direction; one end of the elastic element abuts against the insertion core component, and the other end of the elastic element abuts against the supporting body. According to the optical fiber connector, the insertion core component is movably connected with the supporting body in a limiting mode, the insertion core component can be prevented from excessively rotating to twist off an optical fiber, it can be guaranteed that the insertion core component is in a floating state during working, even if the tail of a jumper wire is stressed, stress deformation of the tail of the optical fiber connector is not transmitted to the insertion core component, and the service life of the optical fiber connector is prolonged. Therefore, the butt joint state of the insertion core optical fiber is not interfered, high-precision insertion loss control is always ensured, and low-loss insertion loss control is always ensured while better tensile property is obtained.

Description

Technical Field

[0001] The present application belongs to the field of optical fiber technology, and more specifically, relates to an optical fiber connector and an inner core component thereof. Background Art

[0002] Traditional fiber optic cabling relies primarily on the pulling method, which is slow and prone to mechanical damage from stretching. Blowing (air-blown cable laying) is a new fiber optic cabling method that uses high-pressure airflow to place the cable into pre-buried silicon core tubes. It offers advantages such as a simple installation process, high speed, and long cable laying distances.

[0003] With existing connectors for blown cable construction, the ferrule is linked to the optical cable after assembly (equivalent to the ferrule being directly fixed to the cable). When the cable is subjected to tension, the force is transferred to the ferrule, affecting the accuracy of the optical fiber alignment, thereby increasing insertion loss and even causing optical path interruption. At the same time, the specifications of air-blown microducts currently used in household sections are 7 / 5mm and 5 / 3.5mm (outer and inner diameters). Based on actual engineering experience, the diameters of the air-blown connectors most suitable for these two types of air-blown microducts are approximately 4mm and 2.8mm. To meet the requirements of these two specifications of air-blown microducts, fiber optic connectors with a diameter of approximately 4mm and LC connectors with a diameter of approximately 2.8mm are already available on the market. However, according to the "YDT 1272.3 Fiber Optic Connector Part 3: SC Type" standard, the outer diameter of the standard SC ceramic ferrule is 2.5mm. Therefore, it is still impossible to reduce the diameter of the SC type fiber optic connector to 2.8mm. As a result, it cannot be used in 5 / 3.5mm air-blown micro-ducts, which seriously increases construction costs and material costs. Utility Model Content

[0004] In response to the defects or improvement needs of the existing technology, the present application provides a fiber optic connector and its inner core component, which aims to solve the problems of poor stability of the existing inner core component and excessive diameter of the SC fiber optic connector, and is compatible with pipe construction and air blowing construction.

[0005] According to one aspect of the present application, an inner core assembly is provided, which includes a core insert component for passing through an optical cable, a support body and an elastic element, wherein the core insert component is movably limitedly connected to the support body so that the core insert component can move relative to the support body in the axial and / or circumferential direction; the support body is fixedly connected to the optical cable; one end of the elastic element abuts against the core insert component, and the other end abuts against the support body.

[0006] As a further preferred embodiment, the ferrule member includes a ferrule and a ferrule tail handle, the ferrule tail handle abuts against the elastic element, the ferrule and the ferrule tail handle are integrally formed into the ferrule member, or the ferrule and the ferrule tail handle are independent components assembled to form the ferrule member;

[0007] Preferably, when the ferrule and the ferrule tail handle are both independent components, the ferrule includes a first ferrule portion and a second ferrule portion having a smaller cross-sectional area than the first ferrule portion, and the second ferrule portion is inserted into the ferrule tail handle;

[0008] Preferably, the ferrule has a stepped structure or a frustum structure.

[0009] As a further preferred embodiment, at least one first limiting boss extending radially is provided at one end of the ferrule tail handle close to the support body; at least one first limiting groove is opened on the outer wall surface of one end of the support body close to the ferrule tail handle for cooperating with the ferrule tail handle to realize clamping, and the first limiting boss can move axially and / or circumferentially in the first limiting groove to realize a movable limiting connection between the ferrule tail handle and the support body; one end of the elastic element passes through the first limiting boss and abuts against the end face of the ferrule tail handle close to the support body, and the other end of the elastic element abuts against the end face of the support body close to the ferrule tail handle; or,

[0010] The end of the ferrule tail handle close to the support body is provided with at least one second limiting groove on the outer wall, and the end of the support body close to the ferrule tail handle is provided with at least one connecting rod extending in the axial direction along the outer circumference, and the connecting rod is provided with a second limiting boss extending in the radial direction for cooperating with the ferrule tail handle to achieve clamping, and the second limiting boss can move axially and / or circumferentially in the second limiting groove to achieve a movable limiting connection between the ferrule tail handle and the support body; one end of the elastic element extends into the interior of the ferrule tail handle and abuts against the boss on its inner wall, and the other end of the elastic element abuts against the end face of the support body close to the ferrule tail handle and is accommodated in the internal space formed by the connecting rod.

[0011] As a further preference, the end of the support body away from the core insert component is a crimping portion, and a stepped hole is provided in the crimping portion. At the same time, the inner core assembly also includes a crimping bushing extending into the crimping portion, and the end of the crimping bushing close to the core insert component is provided with an abutment boss for abutting with the stepped hole to achieve axial limitation of the crimping bushing.

[0012] As a further preferred embodiment, the inner core assembly further comprises a core insert protection cap, one end of the core insert protection cap has an opening for inserting the core insert component, and the other end thereof is closed, or,

[0013] One end of the ferrule protection cap is opened and provided with an internal thread, and the other end is closed and provided with a traction portion. At the same time, the ferrule component is provided with an external thread for inserting the ferrule protection cap and being threadedly connected thereto.

[0014] According to another aspect of the present application, there is provided an optical fiber connector including the above-mentioned inner core assembly, the optical fiber connector also including a shell assembly and a tail sleeve, the shell assembly adopts a hollow structure for passing the inner core assembly, the shell assembly is provided with an elastic arm with one end fixed and the other end suspended, the elastic arm is clamped in the first limiting groove, or the outer wall of the support body is provided with a clamping groove, the elastic arm is clamped in the clamping groove to achieve a limiting connection between the shell assembly and the inner core assembly; the tail sleeve is connected to the shell assembly.

[0015] As a further preferred embodiment, the core insert is provided with an anti-rotation structure, and the housing assembly is provided with a special-shaped hole matching the shape of the anti-rotation structure, for cooperating with the anti-rotation structure to limit the rotation of the core insert relative to the housing assembly;

[0016] Preferably, the outer wall of the anti-rotation structure includes at least one first limiting surface, and the special-shaped hole is provided with at least one second limiting surface at a corresponding position, and the first limiting surface cooperates with the second limiting surface to limit the rotation of the core member relative to the housing assembly;

[0017] Preferably, the anti-rotation structure is provided with an external thread for being threadedly connected to the ferrule protection cap.

[0018] As a further preferred embodiment, the outer wall of the insert member is provided with at least one step structure, and the step structure abuts against the boss inside the housing assembly to achieve installation limitation;

[0019] Preferably, the first limiting surface of the anti-rotation structure forms a step structure on the outer wall of the core insert component, and the step structure abuts against the boss inside the housing assembly to achieve installation limitation.

[0020] As a further preferred embodiment, the ferrule component includes a ferrule and a ferrule tail handle, the ferrule tail handle includes a connecting portion, a limiting portion opposite to the connecting portion, and an intermediate portion connecting the connecting portion and the limiting portion, the outer wall of the connecting portion is provided with an anti-rotation structure, and the anti-rotation structure includes at least one first limiting surface provided on the outer wall of the connecting portion.

[0021] As a further preferred embodiment, the housing assembly includes a shell, and the shell is provided with an elastic arm and connected to the tail sleeve; or,

[0022] The shell assembly includes an outer shell and an inner frame sleeve. The outer shell is arranged on the outer side of the inner frame sleeve. The inner frame sleeve is provided with an elastic arm and is connected to the tail sleeve.

[0023] In general, the above technical solutions conceived by this application have the following technical advantages compared with the existing technologies:

[0024] 1. This application utilizes a movable, limitative connection between the ferrule member and the support body to ensure that the ferrule member is in a floating state during operation. Even when the second end of the jumper cable is subjected to force, the deformation of the second end of the optical fiber connector is not transmitted to the ferrule member, thereby ensuring that the docking state of the ferrule optical fiber is not disturbed and that high-precision insertion loss control is always achieved. This provides good tensile strength while preventing the ferrule member from twisting the optical fiber due to excessive rotation.

[0025] 2. In particular, the present application can effectively reduce the size of the ferrule by designing the ferrule into a stepped structure, avoiding the problem of manufacturing difficulties caused by the thin wall thickness of the ferrule tail handle connected to it, thereby being able to control the outer diameter of the inner core component within 2.8mm, thereby making it applicable to 5 / 3.5mm air-blown micro-tubes, effectively saving the material cost, construction cost and pipeline space of the air-blown micro-tubes, and providing versatility in construction, with huge economic benefits

[0026] 3. At the same time, the present application provides a crimping portion at the end of the support body away from the ferrule tail handle, and provides a stepped hole on the inner wall of the crimping portion, so that it can be used as a crimping ring and a crimping bushing, thereby effectively simplifying the structure of the inner core assembly, with the advantages of low manufacturing cost and easy installation;

[0027] 4. The optical fiber connector provided in this application utilizes the elastic arm of the housing assembly to engage with the support body to achieve the connection between the inner frame sleeve and the inner core assembly, which has the advantages of simple structure and convenient installation;

[0028] 5. In addition, the present application provides an anti-rotation structure on the insert member, which cooperates with the special-shaped hole of the housing assembly to further restrict the rotation of the insert member relative to the housing assembly, thereby improving the anti-rotation effect;

[0029] 6. The present application also provides a step structure on the connection portion of the core insert component, which is used to abut against the boss inside the shell assembly to achieve the installation limit function, which can further simplify the installation process and improve the limiting effect of the inner frame sleeve and the inner core assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a three-dimensional diagram of the inner core assembly provided in an embodiment of the present application after being inserted into an optical cable;

[0031] Figure 2 This is an exploded view of the ferrule in the inner core assembly provided in an embodiment of the present application;

[0032] Figure 3 is a three-dimensional diagram of the ferrule in the inner core assembly provided in an embodiment of the present application;

[0033] Figure 4 is a three-dimensional diagram of a support body in an inner core assembly provided in an embodiment of the present application;

[0034] Figure 5 is a cross-sectional view of a support body in an inner core assembly provided in an embodiment of the present application;

[0035] Figure 6 is an exploded view of the optical fiber connector provided in an embodiment of the present application;

[0036] Figure 7 is a cross-sectional view of an optical fiber connector provided in an embodiment of the present application;

[0037] Figure 8 is a three-dimensional diagram of an inner frame sleeve in an optical fiber connector provided in an embodiment of the present application;

[0038] Figure 9 This is a front view of the inner frame sleeve in the optical fiber connector provided in an embodiment of the present application;

[0039] Figure 10 This is a full cross-sectional view of the inner frame sleeve in the optical fiber connector provided by an embodiment of the present application;

[0040] Figure 11 This is a full cross-sectional view of the inner frame sleeve of the optical fiber connector provided by an embodiment of the present application from the left side;

[0041] Figure 12 is a top view of an inner frame sleeve in an optical fiber connector provided in an embodiment of the present application;

[0042] Figure 13 is a three-dimensional diagram of a tail sleeve in an optical fiber connector provided in an embodiment of the present application;

[0043] Figure 14 is a cross-sectional view of an inner core assembly provided in another embodiment of the present application;

[0044] Figure 15 is a three-dimensional diagram of an inner core assembly provided in another embodiment of the present application;

[0045] Figure 16 is another perspective view of an inner core assembly provided by another embodiment of the present application;

[0046] Figure 17 is a three-dimensional diagram of a ferrule in an inner core assembly provided in another embodiment of the present application;

[0047] Figure 18 This is a three-dimensional diagram of a ferrule protection cap in an inner core assembly provided by another embodiment of the present application;

[0048] Figure 19 It is a cross-sectional view of an inner core component provided in another embodiment of the present application.

[0049] Throughout the drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0050] 1-housing, 1.1-third limiting groove, 2-inner frame, 2.1-first end, 2.1.1-special-shaped hole, 2.1.1.1-second limiting surface, 2.1.2-third limiting boss, 2.1.3-blocking surface, 2.2-accommodating groove, 2.2.1-elastic arm, 2.3-second end, 2.3.1-fourth limiting boss, 2.4-first indicator, 2.5-third end, 3-insert, 3.1-first insert part, 3.2-second insert part, 4-insert tail handle, 4.1-connecting part, 4.1.1-anti-rotation structure, 4.1.1.1-first limiting surface, 4.1.2-step Structure, 4.2-middle part, 4.3-limiting part, 4.3.1-first limiting boss, 4.3.1.1-guide slope, 4.4-second indicator mark, 4.5-external thread, 4.6-second limiting groove, 5-elastic element, 6-support body, 6.1-first limiting groove, 6.2-crimping part, 6.2.1-stepped hole, 6.3-chamfer, 6.4-connecting rod, 6.4.1-second limiting boss, 6.5-clamping groove, 7-crimping bushing, 7.1-abutment boss, 8-tail sleeve, 8.1-notch, 9-optical cable, 10-core protection cap, 10.1-traction part, 10.2-internal thread. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0052] like Figures 1 to 5 、 Figures 14-16 As shown, according to one aspect of the present application, an inner core assembly is provided. When performing pipe construction or air blowing construction, it is necessary to first insert the optical cable into the inner core assembly, and then pass the entire inner core assembly into the microtube. The inner core assembly specifically includes a core member for passing through the optical cable 9, a support body 6 and an elastic element 5, wherein:

[0053] The optical cable includes at least a sheath and an optical fiber. The optical cable as a whole is fixedly connected to the support body 6. The optical fiber inside the optical cable is fixedly connected to the core component. The core component is movably limited and connected to the support body 6, so that the core component can move relative to the support body 6 axially and / or circumferentially within a certain range, thereby ensuring that the core component is in a floating state when working. Therefore, even when the tail of the jumper is subjected to force, the force and deformation of the tail of the optical fiber connector is not transmitted to the core component, thereby ensuring that the docking state of the core optical fiber is not disturbed, and high-precision insertion loss control is always guaranteed, thereby obtaining better tensile resistance while avoiding excessive rotation of the core component to twist the optical fiber; one end of the elastic element 5 abuts against the core component, and the other end abuts against the support body 6, which is used to provide a restoring force for the axial movement of the core component. The core component and the support body 6 are supported by the elastic element 5, the optical cable is fixed at the tail of the support body 6, and the optical fiber in the optical cable is connected to the core component. When the optical cable is subjected to force, the force will be transmitted to the support body 6. Even if the support body 6 is disturbed to a certain extent, the core component and the support body 6 are supported by the elastic element 5, and the elastic element 5 can absorb the disturbance. In addition, the optical fiber is very soft, and the force of the optical cable cannot be transmitted to the core component through the optical fiber. Therefore, this design can ensure good core stability and low attenuation insertion loss even when the optical cable is subjected to a certain tension.

[0054] Furthermore, the ferrule component includes a ferrule 3 and a ferrule tail handle 4. The ferrule 3 and the ferrule tail handle 4 can be integrally formed into the ferrule component, or they can be independent components that are assembled to form the ferrule component.

[0055] like Figures 1 to 5 As shown, in order to realize the movable limiting connection between the ferrule component and the support body 6, in a preferred embodiment of the present application, the ferrule tail handle 4 includes a connecting portion 4.1, a limiting portion 4.3 arranged opposite to the connecting portion 4.1, and an intermediate portion 4.2 connecting the limiting portion 4.3 and the connecting portion 4.1. The end of the ferrule tail handle 4 close to the support body 5 is provided with at least one first limiting boss 4.3.1 extending in the radial direction. When the ferrule 3 and the ferrule tail handle 4 are independent components, the end of the connecting portion 4.1 close to the ferrule 3 has an opening for inserting the ferrule 3. When the ferrule 3 and the ferrule tail handle 4 are integrally formed, the end of the connecting portion 4.1 close to the ferrule 3 is directly connected to the ferrule 3; the diameter of the intermediate portion 4.2 is smaller than the diameter of the connecting portion 4.1, which facilitates reducing the diameter of the elastic element 5 and enables the elastic element 5 to pass through the intermediate portion 4.2 and abut against the connecting portion 4.1; the limiting portion 4.3 is provided with at least one first limiting boss 4.3.1 extending in the radial direction;

[0056] At least one first limiting groove 6.1 is formed on the outer wall of one end of the support body 6 close to the ferrule tail handle 4, which is used to cooperate with the ferrule tail handle 4 to achieve clamping. The length of the first limiting boss 4.3.1 is less than the length of the first limiting groove 6.1, so that the first limiting boss 4.3.1 can move axially in the first limiting groove 6.1, so that the ferrule tail handle 4 can move forward and backward relative to the support body 6; at the same time, the width of the first limiting boss 4.3.1 is less than the circumferential width of the first limiting groove 6.1, and the first limiting boss 4.3.1 can move circumferentially in the first limiting groove 6.1, so that the ferrule tail handle 4 can rotate relative to the support body 6 within a certain angular range. At the same time, because the first limiting groove 6.1 does not extend along the outer wall in a full circle, the ferrule tail handle 4 cannot rotate a full circle relative to the support body 6 under the limiting action of the first limiting groove 6.1. This prevents the ferrule tail handle 4 from excessively rotating and breaking the optical fiber during the tube threading process. The interaction between the first limiting boss 4.3.1 and the first limiting groove 6.1 can achieve a movable limiting connection between the ferrule tail handle 4 and the support body 6. Compared with a fixed connection between the ferrule member and the support body 6, it can compensate for the online load of the tail and ensure high-precision insertion loss control.

[0057] One end of the elastic element 5 passes through the limiting portion 4.3 and the middle portion 4.2, and abuts against the end of the connecting portion 4.1 close to one end of the middle portion 4.2. The other end of the elastic element 5 abuts against the end of the support body 6 close to the ferrule tail handle 4, which is used to provide elastic restoring force for the axial movement of the ferrule tail handle 4.

[0058] Furthermore, when the inner core assembly is used in an SC optical fiber connector, in order to realize construction in a 5 / 3.5mm air-blowing micro-tube, the ferrule 3 adopts a stepped structure, including a first ferrule portion 3.1 and a second ferrule portion 3.2 with a diameter smaller than the first ferrule portion 3.1. The ferrule 3 can be made of ceramic or metal, preferably ceramic. Since the outer diameter of the ceramic ferrule in the standard SC optical fiber connector is 2.5mm, its rear end is fixed to the ferrule tail handle 4 as a whole through interference fit. When the inner core assembly is used in an SC optical fiber connector, in order to ensure that the entire inner core assembly can be constructed in a 3.5mm micro-tube with air blowing and to obtain the maximum air blowing distance, the outer diameter of the inner core assembly is preferably about 2.8mm, and the diameter of the ferrule 3 reaches 2.5mm, and the rear end must also be fixed to the ferrule tail handle 4 through interference fit. The handle 4 has an interference fit, so the outer diameter of the ferrule tail handle 4 is preferably about 2.8 mm. Therefore, the thinnest outer wall of the ferrule tail handle 4, that is, the outer wall at the connection with the ferrule 3, is only (2.8-2.5) mm / 2=0.15 mm, and the outer wall of the ferrule tail handle 4 also needs to be provided with an anti-rotation structure, which will make the production of the ferrule tail handle 4 impossible or the scrap rate high. Therefore, the present application reduces the diameter of the end of the ferrule 3 close to the ferrule tail handle 4, so that the ferrule 3 includes a first ferrule portion 3.1 and a second ferrule portion 3.2 with a diameter smaller than the first ferrule portion 3.1. The second ferrule portion 3.2 is inserted into the ferrule tail handle 4 and has an interference fit with the ferrule tail handle 4 to form a whole. The increased wall thickness of the ferrule tail handle 4 makes the production of the ferrule tail handle 4 simpler. The ferrule 3 is preferably a stepped structure or a frustum structure. The present application can control the outer diameter of the inner core component to about 2.8mm, so that it can be suitable for the air blowing construction of 5 / 3.5mm microtubes, so that when laying microtubes of the same specification, SC type and LC type air blowing connectors can be used, providing versatility in construction; and using 5 / 3.5mm microtubes instead of the original 7 / 5mm microtubes effectively saves the material cost, construction cost and pipeline space of the microtubes.

[0059] Furthermore, the number of the first limiting bosses 4.3.1 and the first limiting grooves 6.1 can be matched, and can be 1 to 4. From the perspective of easy installation and stable clamping, it is preferably symmetrically arranged with two. The outer diameter of the first limiting boss 4.3.1 is slightly larger than the inner diameter of the support body 6. At the same time, in order to facilitate installation, such as Figure 3 As shown, the first limiting boss 4.3.1 is provided with a guide slope 4.3.1.1 at one end thereof close to the first limiting groove 6.1. Figure 4As shown, a chamfer 6.3 is provided on the end face of the support body 6 close to the ferrule tail handle 4. The mutual cooperation between the guide inclined surface 4.3.1.1 and the chamfer 6.3 can facilitate the connection between the support body 6 and the ferrule tail handle 4. At the same time, the end face of the support body 6 close to the ferrule tail handle 4 also abuts against the elastic element 5. During assembly, the elastic element 5 is first passed through the limiting portion 4.3 and the middle portion 4.2, and then the first limiting boss 4.3.1 is pressed into the first limiting groove 6.1. The first limiting boss 4.3.1 and the first limiting groove 6.1 are engaged to prevent the ferrule tail handle 4 from being separated from the support body 6. At the same time, the elastic element 5 abuts against the end face of the support body 6.

[0060] Furthermore, the tail of the support body 6 can be crimped or bonded to the optical cable 9. When the crimping process is adopted, a crimping sleeve 7 can be provided to support the optical cable to prevent it from being crushed. When the bonding process is adopted, the crimping sleeve 7 can be cancelled.

[0061] In a preferred embodiment of the present application, the end of the support body 6 away from the ferrule tail handle 4 is a crimping portion 6.2, and a stepped hole 6.2.1 is provided in the crimping portion 6.2. Figure 6 As shown, the inner core assembly further includes a crimping bushing 7 extending into the crimping portion 6.2. An abutment boss is provided at one end of the crimping bushing 7 close to the ferrule tail handle 4 for abutting against the stepped hole 6.2.1 to achieve axial limitation of the crimping bushing 7.

[0062] Further, if Figure 1 As shown, the inner core assembly also includes a core protection cap 10, which is closed at one end and has a hole at the other end for inserting the core member to protect the core 3 from the end face of the core tail handle 4 and prevent the end face of the core 3 from being contaminated during the construction process. When the inner core assembly is used for air blowing construction, the end of the core protection cap 10 with the hole is connected to the core member by interference fit; Figures 17-19 As shown, when the inner core assembly is used for pulling construction, the closed end of the ferrule protective cap 10 is provided with a pulling portion 10.1 for pulling construction. The open end of the ferrule protective cap 10 is provided with an internal thread 10.2. At the same time, the ferrule member is provided with an external thread 4.5 for threaded connection with the ferrule protective cap 10 to prevent the ferrule protective cap 10 from separating from the inner core assembly during pulling construction. For example, the external thread 4.5 is provided on the outer wall of the connecting portion 4.1 of the ferrule tail shank 4.

[0063] like Figures 14-15As shown, in order to realize the movable limiting connection between the ferrule component and the support body 6, in another preferred embodiment of the present application, at least one second limiting groove 4.6 is opened on the outer wall of the end of the ferrule tail handle 4 close to the support body 6, and at least one connecting rod 6.4 extending in the axial direction is provided along the outer circumference of the end of the support body 6 close to the ferrule tail handle 4. The connecting rod 6.4 is elastic and is provided with a second limiting boss 6.4.1 extending in the radial direction for cooperating with the ferrule tail handle 4 to realize the clamping connection. At the same time, the width of the second limiting boss 6.4.1 is smaller than the circumferential width of the second limiting groove 4.6, and the length of the second limiting boss 6.4.1 is smaller than the second limiting boss 6.4.1. The length of the positioning groove 4.6 allows the second limiting groove 4.6 to move axially and / or circumferentially within the second limiting groove 4.6, thereby allowing the core tail handle 4 to move forward and backward relative to the support body 6, and also to rotate relative to the support body 6 within a certain angular range, but not to rotate a full circle, to prevent the core tail handle 4 from excessive rotation and breaking the optical fiber during the tube threading process. Through the interaction between the second limiting boss 6.4.1 and the second limiting groove 4.6, a movable limiting connection between the core tail handle 4 and the support body 6 can be achieved. Compared with a fixed connection between the core tail handle 4 and the support body 6, it can compensate for the online load of the tail and ensure high-precision insertion loss control;

[0064] One end of the elastic element 5 extends into the interior of the ferrule tail handle 4 and abuts against the boss on the inner wall of the ferrule tail handle 4, and the other end of the elastic element 5 abuts against the end surface of the support body 6 close to the ferrule tail handle 4, and the elastic element 5 is accommodated in the internal space formed by the connecting rod 6.4, so that the elastic element 5 is limited in the radial direction by the connecting rod 6.4.

[0065] Furthermore, the number of the second limiting bosses 6.4.1 matches that of the first limiting grooves 6.1, which can be 1 to 4. From the perspective of easy installation and stable clamping, two symmetrically arranged bosses are preferred.

[0066] Furthermore, the tail of the support body 6 can be crimped or bonded to the optical cable 9. When the crimping process is adopted, a crimping sleeve 7 can be provided to support the optical cable to prevent it from being crushed. When the bonding process is adopted, the crimping sleeve 7 can be cancelled.

[0067] In a preferred embodiment of the present application, the end of the support body 6 away from the ferrule tail handle 4 is a crimping portion 6.2, and a stepped hole 6.2.1 is provided in the crimping portion 6.2. Figure 6 As shown, the inner core assembly further includes a crimping bushing 7 extending into the crimping portion 6.2. An end of the crimping bushing 7 close to the ferrule tail handle 4 is provided with an abutment boss 7.1 for abutting against the stepped hole 6.2.1 to achieve axial limitation of the crimping bushing 7.

[0068] Further, if Figure 1As shown, the inner core assembly also includes a core protection cap 10, which is closed at one end and has a hole at the other end for inserting the core member to protect the core 3 from the end face of the core tail handle 4 and prevent the end face of the core 3 from being contaminated during the construction process. When the inner core assembly is used for air blowing construction, the end of the core protection cap 10 with the hole is connected to the core member by interference fit; Figures 17-19 As shown, when the inner core assembly is used for pulling, the closed end of the ferrule protective cap 10 is provided with a pulling portion 10.1 for pulling. The open end of the ferrule protective cap 10 is provided with an internal thread 10.2. The ferrule member is also provided with an external thread 4.5 for threaded connection with the ferrule protective cap 10 to prevent separation of the ferrule protective cap 10 from the inner core assembly during pulling. The external thread 4.5 can be provided on the outer wall of the ferrule 3 or on the outer wall of the connecting portion 4.1 of the ferrule tail shank 4.

[0069] According to another aspect of this application, Figures 6 to 13 As shown, an optical fiber connector including the above-mentioned inner core component is provided, and the optical fiber connector also includes a shell component and a tail sleeve 8. The shell component adopts a hollow structure for passing the inner core component. The shell component is provided with an elastic arm 2.2.1 with one end fixed and the other end suspended. The elastic arm 2.2.1 is clamped in the first limiting groove 6.1. In this case, the elastic arm 2.2.1 abuts against the inner wall of the first limiting groove 6.1 away from the central axis, and the first limiting boss 4.3.1 abuts against the inner wall of the first limiting groove 6.1 close to the central axis, thereby utilizing the same first limiting groove 6.1 to achieve the clamping connection between the elastic arm 2.2.1 and the first limiting boss 4.3.1; or the outer wall of the support body 6 is provided with a clamping groove 6.5, and the elastic arm 2.2.1 is clamped in the clamping groove 6.5 to achieve the limiting connection between the inner frame sleeve 2 and the inner core component; the tail sleeve 8 is connected to the shell component.

[0070] For an inner core assembly with a first limiting groove 6.1 on the support body 6, the elastic arm 2.2.1 can be directly engaged in the first limiting groove 6.1, or a locking groove 6.5 can be provided on the outer wall of the support body 6, and the elastic arm 2.2.1 can be engaged in the locking groove 6.5. For an inner core assembly with a connecting rod 6.4 and a second limiting boss 6.4.1 on the support body 6, a locking groove 6.5 can be provided on the outer wall of the support body 6, and the elastic arm 2.2.1 can be engaged in the locking groove 6.5.

[0071] Furthermore, for the LC fiber optic connector, the housing assembly includes a shell 1 , on which elastic arms 2 . 2 . 1 are provided for snapping into engagement with the support body 6 , and the shell 1 is connected to the tail sleeve 8 .

[0072] For the SC fiber optic connector, the housing assembly includes an outer shell 1 and an inner frame sleeve 2. The outer shell 1 is sleeved on the outer side of the inner frame sleeve 2. The inner frame sleeve 2 adopts a hollow structure for passing the inner core assembly, which includes a first end 2.1, a second end 2.3 opposite to the first end 2.1, and a third end 2.5 connecting the first end 2.1 and the second end 2.3. The outer wall of the third end 2.5 is provided with at least one accommodating groove 2.2. The interior of the accommodating groove 2.2 is provided with an elastic arm 2.2.1 with one end fixed and the other end suspended. For example, Figure 8 As shown, one end of the elastic arm 2.2.1 is fixed to the end surface of the accommodating groove 2.2 close to the second end 2.3, and the other end extends toward the first end 2.1. The elastic arm 2.2.1 is used to engage with the support body 6, and the inner frame sleeve 2 is also connected to the tail sleeve 8.

[0073] Further, if Figure 3 As shown, the end of the ferrule tail handle 4 close to the ferrule 3 is provided with an anti-rotation structure 4.1.1, and the housing assembly is provided with a special-shaped hole 2.1.1 that matches the shape of the anti-rotation structure 4.1.1, which is used to cooperate with the anti-rotation structure 4.1.1 to limit the rotation of the ferrule component relative to the housing assembly. For LC connectors, the special-shaped hole 2.1.1 is opened inside the housing 1. For SC connectors, Figure 12 As described above, the special-shaped hole 2.1.1 is opened at the first end portion 2.1 of the inner frame sleeve 2.

[0074] In a preferred embodiment of the present application, Figure 3 As shown, the outer wall of the anti-rotation structure 4.1.1 includes at least one first limiting surface 4.1.1.1, and as shown Figure 12 As shown, the special-shaped hole 2.1.1 is provided with at least one second limiting surface 2.1.1.1 at a corresponding position, and the first limiting surface 4.1.1.1 cooperates with the second limiting surface 2.1.1.1 to limit the rotation of the insert component relative to the housing assembly.

[0075] like Figure 17 As shown, for the inner core assembly undergoing traction construction, when the external thread 4.5 is provided on the outer wall of the connecting portion 4.1 in the ferrule tail handle 4, the external thread 4.5 can be provided on the anti-rotation structure 4.1.1, thereby realizing the integration of the external thread 4.5 and the anti-rotation structure 4.1.1.

[0076] Further, if Figure 3 、 17 As shown, the end of the ferrule tail handle 4 close to the ferrule 3 is provided with at least one step structure 4.1.2 for abutting against the boss inside the housing assembly to achieve installation limit. Figure 8As shown, since a through accommodating groove 2.2 is opened on the third end portion 2.5, a blocking surface 2.1.3 is formed at the end of the first end portion 2.1 close to the accommodating groove 2.2, and the step structure 4.1.2 abuts against the blocking surface 2.1.3 of the first end portion 2.1, which is used to limit the movement of the inner core component toward the first end portion 2.1 of the inner frame sleeve, thereby playing the role of installation limit in the process of connecting the inner core component with the inner frame sleeve 2, avoiding excessive movement of the inner core component resulting in the elastic arm 2.2.1 being unable to normally engage with the first limiting groove 6.1 or the engaging groove 6.5.

[0077] In a preferred embodiment of the present application, Figure 3 As shown, the length of the first limiting surface 4.1.1.1 is smaller than the length of the connecting portion 4.1, thereby forming a step structure 4.1.2 on the outer wall of the connecting portion 4.1.

[0078] Further, if Figure 8 As shown, the outer wall of the third end 2.5 is provided with a third limiting boss 2.1.2, and the outer wall of the shell 1 is provided with a third limiting groove 1.1 for clamping the third limiting boss 2.1.2 to achieve the connection between the shell 1 and the inner frame 2.

[0079] like Figure 8 As shown, the outer wall of the second end portion 2.3 is provided with a fourth limiting boss 2.3.1 for engaging with the notch 8.1 on the tail sleeve 8 to achieve the connection between the inner frame sleeve 2 and the tail sleeve 8.

[0080] Further, if Figure 8 As shown, the outer wall of the inner frame sleeve 2 is provided with a first indicator mark 2.4, as shown in FIG. Figure 3 As shown, the outer wall of the ferrule tail handle 4 is provided with a second indicator mark 4.4 for indicating during the installation process.

[0081] When in use, the inner core assembly can be threaded through the pipe by means of air blowing construction or pulling construction. During the threading process, because the core insert component and the support body 6 are supported by the elastic element 5, the optical cable is fixed at the tail of the support body 6, and the optical fiber in the optical cable is fixedly connected to the core insert component. When the optical cable is stressed, the force will be transmitted to the support body 6. Even if the support body 6 is disturbed to a certain extent, the core insert component and the support body 6 are movably limited and connected and supported by the elastic element 5. The elastic element 5 can absorb the disturbance. In addition, the optical fiber is very soft, and the force of the optical cable cannot be transmitted to the core insert component through the optical fiber. Therefore, the inner core assembly provided by this application can ensure good core stability, and even when the optical cable is subjected to a certain tension, low attenuation insertion loss can be guaranteed. After the inner core assembly is completed through the pipe, the inner core assembly is assembled into a fiber optic connector. During assembly, first pass the tail sleeve 8 through the head of the inner core assembly. Because the inner core of the tail sleeve 8 is larger than the outer diameter of the inner core assembly, the tail sleeve 8 can easily pass through the inner core assembly; then remove the core protection cap 10, and then install the inner core assembly into the inner frame sleeve 2 according to the first indicator mark 2.4. When the inner core assembly passes through, the elastic arm 2.2.1 expands. When the inner core assembly continues to move, the elastic arm 2.2.1 is clamped in the first limit groove 6.1 or the clamping groove 6.5; finally, clamp the outer shell 1 to the outside of the inner frame sleeve 2.

[0082] It should be understood that expressions such as "include" and "may include" used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In this application, terms such as "include" and / or "have" may be interpreted as indicating a specific characteristic, number, operation, constituent element, component, or combination thereof, but may not be interpreted as excluding the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.

[0083] It should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0084] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0085] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0086] It is easy for those skilled in the art to understand that the above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. An inner core component, characterized in that: The inner core assembly comprises an insert member for passing through the optical cable (9), a support body (6) and an elastic element (5), wherein the insert member is movably limitedly connected to the support body (6) so that the insert member can move relative to the support body (6) in the axial direction and / or the circumferential direction; the support body (6) is fixedly connected to the optical cable (9); one end of the elastic element (5) abuts against the insert member, and the other end abuts against the support body (6).

2. The inner core assembly according to claim 1, wherein The core insert component comprises a core insert (3) and a core insert tail handle (4), the core insert tail handle (4) abuts against the elastic element (5), the core insert (3) and the core insert tail handle (4) are integrally formed into the core insert component, or the core insert (3) and the core insert tail handle (4) are both independent components assembled to form the core insert component.

3. The inner core assembly according to claim 2, characterized in that When the ferrule (3) and the ferrule tail handle (4) are both independent components, the ferrule (3) comprises a first ferrule portion (3.1) and a second ferrule portion (3.2) having a smaller cross-sectional area than the first ferrule portion (3.1), and the second ferrule portion (3.2) is inserted into the ferrule tail handle (4).

4. The inner core assembly according to claim 3, characterized in that The insert (3) has a stepped structure or a frustum structure.

5. The inner core assembly according to claim 2, wherein: At least one first limiting boss (4.3.1) extending radially is provided at one end of the insert tail handle (4) close to the support body (6); at least one first limiting groove (6.1) is provided on the outer wall surface of one end of the support body (6) close to the insert tail handle (4) for cooperating with the insert tail handle (4) to realize clamping, and the first limiting boss (4.3.1) can move axially and / or circumferentially in the first limiting groove (6.1) to realize a movable limiting connection between the insert tail handle (4) and the support body (6); one end of the elastic element (5) passes through the first limiting boss (4.3.1) and abuts against the end face of the insert tail handle (4) close to the support body (6), and the other end of the elastic element (5) abuts against the end face of the support body (6) close to the insert tail handle (4); or, At least one second limiting groove (4.6) is formed on the outer wall of one end of the insert tail handle (4) close to the support body (6); at least one connecting rod (6.4) extending in the axial direction is provided along the outer periphery of one end of the support body (6) close to the insert tail handle (4); the connecting rod (6.4) is provided with a second limiting boss (6.4.1) extending in the radial direction for cooperating with the insert tail handle (4) to realize clamping; and the second limiting boss (6.4.1) can move in the axial direction and / or circumferential direction in the second limiting groove (4.6) to realize a movable limiting connection between the insert tail handle (4) and the support body (6); one end of the elastic element (5) extends into the interior of the insert tail handle (4) and abuts against the boss on its inner wall, and the other end of the elastic element (5) abuts against the end face of the support body (6) close to the insert tail handle (4) and is accommodated in the internal space formed by the connecting rod (6.4).

6. The inner core assembly according to claim 1, wherein: The end of the support body (6) away from the core inserting member is a crimping portion (6.2), and a stepped hole (6.2.1) is provided in the crimping portion (6.2). The inner core assembly also includes a crimping bushing (7) extending into the crimping portion (6.2), and an abutting boss (7.1) is provided at one end of the crimping bushing (7) close to the core inserting member for abutting against the stepped hole (6.2.1) to achieve axial limitation of the crimping bushing (7).

7. The inner core assembly according to any one of claims 1 to 6, characterized in that: The inner core assembly further comprises a core protection cap (10), one end of the core protection cap (10) is opened for inserting the core component, and the other end is closed, or, One end of the ferrule protection cap (10) is opened and provided with an internal thread (10.2), while the other end is closed and provided with a traction portion (10.1). The ferrule component is provided with an external thread (4.5) for inserting the ferrule protection cap (10) and being connected thereto via a thread.

8. An optical fiber connector comprising the inner core assembly according to any one of claims 1 to 7, characterized in that: The optical fiber connector further comprises a housing component and a tail sleeve (8), wherein the housing component adopts a hollow structure for passing through the inner core component, and the housing component is provided with an elastic arm ( 2.2.1), the elastic arm (2.2.1) is snapped into the first limiting groove (6.1), or the outer wall of the support body (6) is provided with a snapping groove (6.5), and the elastic arm (2.2.1) is snapped into the snapping groove (6.5) to achieve a limited connection between the shell assembly and the inner core assembly; the tail sleeve (8) is connected to the shell assembly.

9. The optical fiber connector according to claim 8, wherein: The core insert is provided with an anti-rotation structure ( 4.1.1), and the housing assembly is provided with an anti-rotation structure ( 4.1.1) Shape matching special-shaped holes ( 2.1.1), used to cooperate with the anti-rotation structure (4.1.1) to limit the rotation of the insert member relative to the housing assembly.

10. The optical fiber connector according to claim 9, wherein: The outer wall of the anti-rotation structure (4.1.1) includes at least one first limiting surface ( 4.1.1.1), and the special-shaped hole (2.1.1) is provided with at least one second limiting surface ( 2.1.1.1), the first limiting surface ( 4.1.1.1) and the second limit surface ( 2.1.1.1) to restrict the rotation of the insert member relative to the housing assembly.

11. The optical fiber connector according to claim 9, wherein: The anti-rotation structure ( 4.1.1) is provided with an external thread (4.5) for being connected to the ferrule protection cap (10) through a thread.

12. The optical fiber connector according to claim 9, wherein: The outer wall of the core insert is provided with at least one step structure ( 4.1.2), the step structure (4.1.2) abuts against the boss inside the shell assembly to achieve installation limit.

13. The optical fiber connector according to claim 12, wherein: The first limiting surface of the anti-rotation structure ( 4.1.1.1) A step structure (4.1.2) is formed on the outer wall of the insert component, and the step structure (4.1.2) abuts against the boss inside the shell assembly to achieve installation limit.

14. The optical fiber connector according to claim 12, wherein: The core insert component comprises a core insert and a core insert tail handle (4); the core insert tail handle (4) comprises a connecting portion (4.1), a limiting portion (4.3) opposite to the connecting portion (4.1), and an intermediate portion (4.2) connecting the connecting portion (4.1) and the limiting portion (4.3); an outer wall of the connecting portion (4.1) is provided with an anti-rotation structure ( 4.1.1), the anti-rotation structure ( 4.1.1) includes at least one first limiting surface ( 4.1.1.1）。 15. The optical fiber connector according to any one of claims 8 to 14, wherein: The housing assembly comprises a shell (1), wherein the shell (1) is provided with an elastic arm (2.2.1) and is connected to the tail sleeve (8); or, The housing assembly comprises an outer shell (1) and an inner frame sleeve (2), wherein the outer shell (1) is sleeved on the outer side of the inner frame sleeve (2), and the inner frame sleeve (2) is provided with an elastic arm (2.2.1) and is connected to the tail sleeve (8).

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