Optical fiber connector and inner core assembly thereof

Abstract

The invention 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 mainly uses the pulling method to lay optical cables, which has the problems of slow cable laying speed and easy mechanical stretching damage. Cable blowing (optical cable air blowing laying method) construction is a new type of fiber optic cabling method, which mainly uses high-pressure airflow to blow the optical cable into the pre-buried silicon core tube. It has the advantages of simple laying process, fast laying speed and long laying distance.

[0003] For the connectors of the existing cable blowing construction, the ferrule is linked with the optical cable after assembly (equivalent to the ferrule being directly fixed to the optical cable). When the optical cable is subjected to tension, the force will be transmitted to the ferrule, affecting the accuracy of the optical fiber, thereby increasing the insertion loss and even causing the optical path to be interrupted. At the same time, the specifications of the air-blown micro-ducts used in the current engineering construction are 7 / 5mm and 5 / 3.5mm (outer diameter and inner diameter). According to actual engineering experience, the diameters of the air-blown connectors that are most suitable for the construction of these two types of air-blown micro-ducts are about 4mm and 2.8mm. In order to meet the construction of these two specifications of air-blown micro-ducts, there are already optical fiber connectors with a diameter of about 4mm and LC connectors with a diameter of about 2.8mm on the market. However, according to the standard "YDT 1272.3 Fiber Optic Connector Part 3: SC Type", 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. Summary of the invention

[0004] In response to the defects or improvement needs of the prior art, the present application provides a fiber optic connector and its inner core assembly, which aims to solve the problems of poor stability of the existing inner core assembly and excessively large 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 penetrating 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 an 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 thereof abuts against the support body.

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

[0007] Preferably, when the ferrule and the ferrule tail handle are both independent components, the ferrule comprises 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 insert 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] At least one second limiting groove is formed on the outer wall of one end of the ferrule tail handle close to the support body, and at least one connecting rod extending in the axial direction is arranged along the outer circumference of one end of the support body close to the ferrule tail handle, and the connecting rod is provided with a second limiting boss extending in the radial direction, which is used to cooperate 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 preferred embodiment, the end of the support body away from the core insert component is a crimping portion, and a stepped hole is arranged in the crimping portion. The inner core assembly also includes a crimping bushing extending into the crimping portion, and an abutment boss is arranged at one end of the crimping bushing close to the core insert component for abutting against the stepped hole to achieve axial limitation of the crimping bushing.

[0012] As further preferred, 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 of the cap 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 connected thereto by threads.

[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 snapped into a first limiting groove, or a snap-in groove is provided on the outer wall of the support body, the elastic arm is snapped into the snap-in 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 inserting member is provided with an anti-rotation structure, and the housing assembly is provided with a shaped hole matching the shape of the anti-rotation structure, for cooperating with the anti-rotation structure to limit the rotation of the core inserting member 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 insert component 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 core inserting member is provided with at least one step structure, and the step structure abuts against the boss inside the housing assembly to achieve installation limit;

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

[0020] As a further preferred embodiment, the core insert component includes a core insert and a core insert tail handle, the core insert 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 arranged on the outer wall of the connecting portion.

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

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

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

[0024] 1. The present application can ensure that the ferrule component is in a floating state when working by connecting the ferrule component to the support body in an active limit position. Even when the second end of the jumper is stressed, the stress deformation of the second end of the optical fiber connector is not transmitted to the ferrule component, thereby ensuring that the docking state of the ferrule optical fiber is not disturbed, and always ensuring high-precision insertion loss control, thereby obtaining better tensile resistance while preventing the ferrule component from twisting the optical fiber off due to excessive rotation;

[0025] 2. In particular, the present application can effectively reduce the size of the ferrule by designing the ferrule as a stepped structure, avoiding the problem of manufacturing difficulties caused by the thin wall thickness of the ferrule tail handle connected thereto, thereby being able to control the outer diameter of the inner core component within 2.8 mm, thereby enabling it to be applied to 5 / 3.5 mm 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, which has huge economic benefits.

[0026] 3. At the same time, the present application can be used as a crimping ring and a crimping bushing by setting the end of the support body away from the ferrule tail handle as a crimping part and setting a stepped hole on the inner wall of the crimping part, thereby effectively simplifying the structure of the inner core component, and having the advantages of low manufacturing cost and easy installation;

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

[0028] 5. In addition, the present application can further restrict the rotation of the core insert component relative to the housing assembly by providing an anti-rotation structure on the core insert component and cooperating with the special-shaped hole of 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 is a stereoscopic diagram of an inner core assembly provided in an embodiment of the present application after being inserted into an optical cable;

[0031] Figure 2 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 a core insert in an 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] Fig. 9 It is a front view of an inner frame sleeve in an optical fiber connector provided in an embodiment of the present application;

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

[0040] Fig.11 is a full cross-sectional view of the inner frame sleeve in the optical fiber connector provided in an embodiment of the present application from the left;

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

[0042] Fig.13 is a stereoscopic diagram of a tail sleeve in an optical fiber connector provided in an embodiment of the present application;

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

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

[0045] Fig.16 is another stereoscopic view of an inner core assembly provided by another embodiment of the present application;

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

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

[0048] Fig.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 indication mark, 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-step hole, 6.3-chamfer, 6.4-connecting rod, 6.4.1-second limiting boss, 6.5-clamping groove, 7-crimping bushing, 7.1-abutting 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 solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

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

[0053] The optical cable at least includes a sheath and an optical fiber. The entire optical cable is fixedly connected to a support body 6. The optical fiber inside the optical cable is fixedly connected to a core member. The core member is movably limitedly connected to the support body 6, so that the core member can move relative to the support body 6 axially and / or circumferentially within a certain range, thereby ensuring that the core member is in a floating state when working. Therefore, even when the tail of the jumper is subjected to force, the force deformation of the tail of the optical fiber connector is not transmitted to the core member, 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 member to twist the optical fiber off; one end of the elastic element 5 abuts against the core member, 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 member. 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, 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 can ensure 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 core plug component and the support body 6, in a preferred embodiment of the present application, the core plug 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 core plug 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 core plug 3 and the core plug tail handle 4 are independent components, the end of the connecting portion 4.1 close to the core plug 3 is opened for inserting the core plug 3. When the core plug 3 and the core plug tail handle 4 are integrally formed, the end of the connecting portion 4.1 close to the core plug 3 is directly connected to the core plug 3; the diameter of the intermediate portion 4.2 is smaller than the diameter of the connecting portion 4.1, so as to reduce the diameter of the elastic element 5 and enable 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 surface of one end of the support body 6 close to the core tail handle 4, which is used to cooperate with the core tail handle 4 to realize 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 core 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 core tail handle 4 can rotate relative to the support body 6 within a certain angle range. At the same time, because the first limiting groove 6.1 is not opened along the outer wall for 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, so as to prevent the ferrule tail handle 4 from excessively rotating and breaking the optical fiber during the tube insertion process. Through the interaction between the first limiting boss 4.3.1 and the first limiting groove 6.1, the ferrule tail handle 4 can be connected to the support body 6 with a movable limiting connection. Compared with the fixed connection between the ferrule member and the support body 6, the online load of the tail can be compensated, and the high-precision insertion loss control can be ensured;

[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, and the other end of the elastic element 5 abuts against the end of the support body 6 close to the ferrule tail handle 4, so as 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 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 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, and 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, two symmetrically arranged ones are preferred. 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, a guide slope 4.3.1.1 is provided at one end of the first limiting boss 4.3.1 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, and the mutual cooperation between the guiding 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 is also abutted 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 is clamped with the first limiting groove 6.1 to prevent the ferrule tail handle 4 from being separated from the support body 6, and at the same time, the elastic element 5 is abutted 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 also 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 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 plug protection cap 10, one end of which is closed and the other end is open, for inserting the plug member to protect the plug 3 from the end face of the plug tail handle 4, to prevent the end face of the plug 3 from being contaminated during the construction process. When the inner core assembly is used for air blowing construction, the end of the plug protection cap 10 with the hole is connected with the plug member by interference fit; Figures 17 to 19 As shown, when the inner core assembly is used for traction construction, the closed end of the ferrule protection cap 10 is provided with a traction portion 10.1 for traction construction, and the end of the opening of the ferrule protection cap 10 is provided with an internal thread 10.2, and the ferrule member is provided with an external thread 4.5, which is used to be connected with the ferrule protection cap 10 by threading to prevent the ferrule protection cap 10 from being separated from the inner core assembly during traction construction. Exemplarily, the external thread 4.5 is provided on the outer wall of the connecting portion 4.1 in the ferrule tail handle 4.

[0063] like Figures 14-15As shown, in order to realize the movable limiting connection between the core insert 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 core insert tail handle 4 close to the support body 6, and at least one connecting rod 6.4 extending in the axial direction is arranged along the outer circumference of the end of the support body 6 close to the core insert tail handle 4, and the connecting rod 6.4 is elastic and is provided with a second limiting boss 6.4.1 extending in the radial direction, which is used to cooperate with the core insert tail handle 4 to realize the clamping connection, and 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 enables the second limiting groove 4.6 to move axially and / or circumferentially in the second limiting groove 4.6, so that the ferrule tail handle 4 can move forward and backward relative to the support body 6, and can also rotate relatively within a certain angle range, but cannot rotate a full circle, to prevent the ferrule tail handle 4 from excessively rotating and breaking the optical fiber during the tube insertion process. Through the interaction between the second limiting boss 6.4.1 and the second limiting groove 4.6, the ferrule tail handle 4 can be connected to the support body 6 through a movable limiting connection. Compared with the fixed connection between the ferrule tail handle 4 and the support body 6, the online load of the tail can be compensated, and high-precision insertion loss control can be ensured;

[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, 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 also 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 plug protection cap 10, one end of which is closed and the other end is open, for inserting the plug member to protect the plug 3 from the end face of the plug tail handle 4, to prevent the end face of the plug 3 from being contaminated during the construction process. When the inner core assembly is used for air blowing construction, the end of the plug protection cap 10 with the hole is connected with the plug member by interference fit; Figures 17 to 19 As shown, when the inner core assembly is used for traction construction, the closed end of the plug protection cap 10 is provided with a traction portion 10.1 for traction construction, and the end of the plug protection cap 10 with an opening is provided with an internal thread 10.2, and the plug member is provided with an external thread 4.5 for threaded connection with the plug protection cap 10 to prevent the plug protection cap 10 from being separated from the inner core assembly during traction construction. The external thread 4.5 can be provided on the outer wall of the plug 3, or on the outer wall of the connecting portion 4.1 in the plug tail handle 4.

[0069] According to another aspect of this application, Figures 6 to 13 As shown, a fiber optic connector including the above-mentioned inner core component is provided, and the fiber optic 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, so that the elastic arm 2.2.1 and the first limiting boss 4.3.1 are clamped by the same first limiting groove 6.1; 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 realize 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 the inner core assembly with the first limiting groove 6.1 on the support body 6, the elastic arm 2.2.1 can be directly clamped in the first limiting groove 6.1, or a clamping groove 6.5 can be provided on the outer wall of the support body 6, and the elastic arm 2.2.1 can be clamped in the clamping groove 6.5. For the inner core assembly with the connecting rod 6.4 and the second limiting boss 6.4.1 on the support body 6, a clamping groove 6.5 is provided on the outer wall of the support body 6, and the elastic arm 2.2.1 is clamped in the clamping groove 6.5.

[0071] Furthermore, for the LC optical fiber connector, the housing assembly includes a shell 1 , on which an elastic arm 2 . 2 . 1 is provided for clamping with a support body 6 , and the shell 1 is connected with a tail sleeve 8 .

[0072] For the SC optical fiber 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 through 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, and 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 component is provided with a special-shaped hole 2.1.1 matching 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 component. For LC connectors, the special-shaped hole 2.1.1 is opened inside the housing 1, and for SC connectors, such as Fig.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. Fig.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 core insert component relative to the housing assembly.

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

[0076] Further, if Figure 3 , 17 As shown, at least one step structure 4.1.2 is provided at one end of the ferrule tail handle 4 close to the ferrule 3, which is used to abut against the boss inside the housing assembly to achieve installation limit. Figure 8As shown, since a through accommodating groove 2.2 is formed 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, and is used to limit the movement of the inner core component toward the direction of the first end portion 2.1 of the inner frame sleeve, thereby playing a role of installation limit in the process of connecting the inner core component with the inner frame sleeve 2, and preventing the inner core component from excessively moving, 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, so that a step structure 4.1.2 is formed 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 outer 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 outer 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 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 indication mark 2.4, such as Figure 3 As shown, the outer wall of the ferrule tail handle 4 is provided with a second indication 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 in this application can ensure good core insert 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 component. Because the inner core of the tail sleeve 8 is larger than the outer diameter of the inner core component, the tail sleeve 8 can easily pass through the inner core component; then remove the core protection cap 10, and then install the inner core component into the inner frame sleeve 2 according to the first indication mark 2.4. When the inner core component passes through, the elastic arm 2.2.1 expands. When the inner core component 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 on 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 specific characteristics, numbers, operations, constituent elements, components or combinations 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" and the like indicate orientations or positional relationships based on the orientations or positional relationships 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0084] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0085] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0086] It will be easily understood by those skilled in the art that the above description 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 shall 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 a core insert component for penetrating the optical cable (9), a support body (6) and an elastic element (5), wherein the core insert component is movably limitedly connected to the support body (6) so that the core insert component 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 core insert component, and the other end thereof abuts against the support body (6).

2. The inner core assembly according to claim 1, characterized in that: The core insert component comprises a core insert (3) and a core insert tail handle (4), the core insert tail handle (4) abuts against an 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 independent components assembled to form the core insert component; Preferably, 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); Preferably, the insert (3) is a stepped structure or a frustum structure.

3. The inner core assembly according to claim 2, characterized in that: At least one first limiting boss (4.3.1) extending in the radial direction is arranged at one end of the insert tail handle (4) close to the support body (6); at least one first limiting groove (6.1) is opened on the outer wall surface of one end of the support body (6) close to the insert tail handle (4), which is used to cooperate with the insert tail handle (4) to achieve clamping, and the first limiting boss (4.3.1) can move axially and / or circumferentially in the first limiting groove (6.1) to achieve 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 plug tail handle (4) close to the support body (6); at least one connecting rod (6.4) extending in the axial direction is arranged along the outer circumference of one end of the support body (6) close to the plug 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 plug 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 plug tail handle (4) and the support body (6); one end of the elastic element (5) extends into the interior of the plug tail handle (4) and abuts against the boss on its inner wall; the other end of the elastic element (5) abuts against the end face of the support body (6) close to the plug tail handle (4) and is accommodated in the internal space formed by the connecting rod (6.4).

4. The inner core assembly according to claim 1, characterized in that: 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 arranged 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 abutment boss (7.1) is arranged at one end of the crimping bushing (7) close to the core inserting member, which is used to abut against the stepped hole (6.2.1) to achieve axial limitation of the crimping bushing (7).

5. The inner core assembly according to any one of claims 1 to 4, characterized in that: The inner core assembly further comprises a core insert protection cap (10), one end of the core insert protection cap (10) has an opening for inserting the core insert component, and the other end is closed, or, One end of the ferrule protection cap (10) is open and provided with an internal thread (10.2), and the other end is closed and provided with a traction portion (10.1). At the same time, the ferrule component is provided with an external thread (4.5) for inserting the ferrule protection cap (10) and being connected thereto by thread.

6. An optical fiber connector comprising the inner core assembly according to any one of claims 1 to 5, characterized in that: The optical fiber connector also includes a shell component and a tail sleeve (8). The shell component adopts a hollow structure and is used to pass through 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 snapped into the first limiting groove (6.1), or the outer wall of the support body (6) is provided with a snap-in groove (6.5), and the elastic arm (2.2.1) is snap-into the snap-in groove (6.5) to achieve a limited connection between the shell component and the inner core component; the tail sleeve (8) is connected to the shell component.

7. The optical fiber connector according to claim 6, wherein: The core insert component is provided with an anti-rotation structure (4.1.1), and the housing component is provided with a special-shaped hole (4.1.1) matching the shape of the anti-rotation structure (4.1.1). 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; Preferably, the outer wall of the anti-rotation structure (4.1.1) includes at least one first limiting surface ( 4.1.1.1), and at the same time, 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) cooperates with the second limiting surface (2.1.1.1) to limit the rotation of the core insert component relative to the housing assembly; Preferably, 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.

8. The optical fiber connector according to claim 6, characterized in that the outer wall of the core insert component is provided with at least one step structure (4.1.2), and the step structure (4.1.2) abuts against the boss inside the housing assembly to achieve installation limit; Preferably, 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 core insert component, and the step structure (4.1.2) abuts against the boss inside the shell component to achieve installation limit.

9. The optical fiber connector according to claim 7, 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 anti-rotation structure (4.1.1) is provided on the outer wall of the connecting portion (4.1); the anti-rotation structure (4.1.1) comprises at least one first limiting surface (4.1.1.1) provided on the outer wall of the connecting portion (4.1).

10. The optical fiber connector according to any one of claims 6 to 9, characterized in that: The housing assembly comprises a housing (1), on which an elastic arm (2.2.1) is arranged and connected to a tail sleeve (8); or, The outer shell assembly comprises 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); 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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