Air-blown fiber optic connector

Abstract

An air-blown fiber optic connector comprising an air-blown section and a non-air-blown section that are detachable from each other, wherein the air-blown section comprises an inner core assembly and an air-blown microcable pre-assembled to the inner core assembly, and the non-air-blown section comprises a housing with a through-hole, characterized in that the inner core assembly comprises an insert, an insert tail handle, a spring, a support element and a crimp sleeve; one end of the insert is an insert body with a conductive end face, while its other end is a tail-handle connector end, with one end of the insert tail-handle being connected to the tail-handle connector end and its other end being connected to the crimp sleeve to secure one end of the air-blown micro cable; and a middle section of the insert tail handle comprises a sleeve section and a support section which are arranged coaxially, wherein the outer diameter of the sleeve section is larger than that of the support section and an annular step surface is formed at the junction of the sleeve section and the support section, while the support element is arranged slipped over the outer circumference of the support section and is held axially by the annular step surface, wherein one end of the spring is arranged slipped over the outer circumference of the sleeve section and held axially and its other end rests against the end of the support element; wherein the through-hole serves for the removable insertion of the inner core assembly, wherein a fastening element is arranged in the through-hole, whereby the support element can be axially locked by the fastening element after the inner core assembly has been fully inserted.

Description

Technical field

[0001] The present utility model relates to the technical field of optical communication, in particular an air-blown fiber optic connector. State of the art

[0002] With the continuous development of the Fiber-to-the-Home policy, the technology of air-blown fiber optic cable has seen relatively widespread application and development, thereby driving innovation in related supporting technologies.

[0003] To reduce the complexity and number of steps involved in connecting fiber optic cables after blowing them into residential buildings, pre-assembled fiber optic connectors have been developed. These connectors feature a separable design, with the inner core assembly required for fiber insertion already pre-installed on the fiber optic cable at the factory. After blowing the cable into the building, the inner core assembly is then joined to the other parts of the fiber optic connector (such as the outer shell, end cap, etc.) at the end of the blown fiber optic cable. This allows for quick assembly and configuration of the fiber optic connector during the blowing process, thereby reducing the time required for laying the fiber optic cable on-site and increasing construction efficiency.

[0004] With pre-assembled fiber optic connectors, the blown section must be assembled with the non-blown section (such as the housing, end cap, etc.) after installation to ensure the reliability of the connectors' subsequent use. However, the assembly process for existing pre-assembled fiber optic connectors is often cumbersome, requiring the joining of the blown and non-blown sections, resulting in increased complexity and reduced efficiency. Furthermore, separating the non-blown section from the blown section (e.g., when replacing the housing, end cap, etc.) of already assembled fiber optic connectors often proves difficult. This limitation imposes certain constraints on the application of fiber optic connectors. Content of the utility model

[0005] To address one or more of the aforementioned shortcomings or improvement requirements in the prior art, the present utility model provides an air-blown fiber optic connector. This connector meets the requirements for air bubbles in air-blown fiber optic connectors and enables quick assembly and disassembly of the air-blown section from the non-air-blown section, thereby improving the user-friendliness of the air-blown fiber optic connector.

[0006] To achieve the aforementioned objectives, the present utility model provides an air-blown fiber optic connector comprising an air-blown section and a non-air-blown section that are detachable from each other, wherein the air-blown section comprises an inner core assembly and an air-blown microcable pre-assembled to the inner core assembly, and the non-air-blown section comprises a housing with a through-hole, wherein the inner core assembly comprises an insert, an insert tail handle, a spring, a support element and a crimp sleeve;

[0007] One end of the insert is an insert body with a conductive end face, while the other end is a tail-handle connector end, with one end of the insert tail-handle being connected to the tail-handle connector end and the other end being connected to the crimp sleeve to secure one end of the air-blown micro cable; and a middle section of the insert tail handle comprises a sleeve section and a support section which are arranged coaxially, wherein the outer diameter of the sleeve section is larger than that of the support section and an annular step surface is formed at the junction of the sleeve section and the support section, while the support element is arranged slipped over the outer circumference of the support section and is held axially by the annular step surface, wherein one end of the spring is arranged slipped over the outer circumference of the sleeve section and held axially and its other end rests against the end of the support element; wherein the through-hole serves for the removable insertion of the inner core assembly, wherein a fastening element is arranged in the through-hole, whereby the support element can be axially locked by the fastening element after the inner core assembly has been fully inserted.

[0008] As a further improvement to the present utility model, the outer diameter of the insert body is not smaller than the outer diameter of the tail handle connection end, while the outer diameter of the insert body is not greater than 2.5 mm, and the maximum outer diameter of the inner core assembly is not greater than 2.8 mm.

[0009] As a further improvement of the present utility model, the air-blown fiber optic connector is an SC fiber optic connector, wherein the outer diameter of the insert body is larger than the outer diameter of the tail-handle connector end; and The outer diameter of the insert body is 2.5 mm, while the outer diameter of the tail handle connection end is between 1.2 mm and 2.2 mm.

[0010] Due to the aforementioned design with a small outer diameter at the tail handle end of the insert, it is possible to reduce the outer diameter of the insert tail handle when selecting the insert for SC fiber connectors. This limits the outer diameter of the inner core assembly to a maximum of 2.8 mm, enabling air blowing into microtubes with an outer diameter of 5 mm and an inner diameter of 3.5 mm. This allows SC fiber connectors to be blown through microtubes with an outer diameter of 7 mm and an inner diameter of 5 mm, as well as microtubes with an outer diameter of 5 mm and an inner diameter of 3.5 mm. Furthermore, microtubes with an outer diameter of 5 mm and an inner diameter of 3.5 mm can be used for both LC and SC fiber connectors in the air blowing process.This significantly increases the flexibility and versatility of laying the air-blown microcable, thus reducing the material and space costs associated with the use of microtubes. Consequently, this improves the cost-effectiveness of applications and construction projects using air-blown microcables.

[0011] At the same time, a more precise definition of the dimensions of the tail handle connection end can achieve a balance between the structural reliability and stability of the rear end of the insert, while simultaneously ensuring the reliability of the wall thickness of the mounting section for the press fit of the anti-rotation section.

[0012] As a further improvement of the present utility model, the housing comprises an inner frame sleeve and an outer shell which is to be arranged fitted over the outer circumference of the inner frame sleeve; wherein the through-hole is arranged axially within the inner frame sleeve, and the fastening element consists of two elastic arms arranged opposite each other on the inner frame sleeve, while the support element can be clamped and secured by the two elastic arms after the inner core assembly is inserted into the through-hole.

[0013] As a further improvement of the present utility model, an annular stepped surface is formed on the outer circumference of the support element, wherein the two elastic arms, after assembly of the inner core assembly and the inner frame sleeve, are able to rest their ends against the annular stepped surface and / or clamp the outer circumference of the support element: or The support element is a circular sleeve structure with an outer diameter larger than the inner diameter of the spring, its end being pressed firmly against the end of the spring after the insert tail handle is fitted, while in the middle section a circumferential groove is formed on the outer circumference of the support element, and the two elastic arms are able to clamp the groove when the inner core assembly and the inner frame sleeve are fully assembled.

[0014] The design of the two support element configurations allows the support element to reliably engage with the two elastic arms within the inner frame sleeve. This arrangement enables the ends of the two elastic arms to rest against the inner wall surfaces of the annular step surface or the groove formed by the large and small diameter ends. This ensures axial locking of the support element once the two elastic arms are engaged, thus guaranteeing the reliability of the fiber optic connector during subsequent use.

[0015] As a further improvement to the present utility model, the opposing ends of the two elastic arms are each provided with a limiting projection, the distance between the two limiting projections being no greater than the outer diameter of the section of the support element intended for clamping.

[0016] By appropriately designing the limiting projection, the reliability and accuracy of the elastic arms during clamping can be further improved.

[0017] As a further improvement of the present utility model, the air-blown fiber optic connector is an LC fiber optic connector, while the housing is an outer frame sleeve provided with a through-hole and a fastening element.

[0018] As a further improvement to the present utility model, the tail handle connection end is connected to one end of the insert tail handle by a press fit; and / or one end of the crimp sleeve is connected to the end of the insert tail handle via a thread; and / or the crimp sleeve is attached to the end of the air-blown micro cable by crimping or gluing; and / or The inner core assembly also includes a dust cap designed to fit over the outer circumference of the insert body.

[0019] As a further improvement of the present utility model, the insert tail handle at the end for connecting the insert includes an anti-rotation section, wherein the outer diameter of the anti-rotation section is larger than that of the sleeve section and a non-rotatable structure is formed at one end of the anti-rotation section that is away from the sleeve section; wherein the middle section of the through-hole is provided with an anti-rotation hole, the inner contour of which corresponds to the outer contour of the non-rotatable structure and serves to align and insert the tail handle within the through-hole.

[0020] As a further improvement of the present utility model, the non-air-blown section further comprises an end sleeve, wherein an end sleeve connection section is provided at the rear end of the inner frame sleeve, and the end sleeve can be placed onto the end sleeve connection section after the inner core assembly is passed through the end sleeve; and / or The outer circumference of the housing is marked with a label, while a marking corresponding to the label is arranged on the outer circumference of the insert tail handle.

[0021] The alignment of the markings with the labels allows for precise positioning of the inner core assembly relative to the inner frame sleeve during assembly. This prevents jamming or damage caused by inaccurate alignment of the inner core assembly, thus ensuring a directional and precise installation.

[0022] The above-mentioned improved technical features can be combined, provided they do not conflict with each other.

[0023] Overall, the technical solutions conceived in the present utility model offer the following advantages compared to the prior art: This utility model relates to an air-blown fiber optic connector comprising an air-blown section and a non-air-blown section, which are detachable from one another. The combined arrangement of an insert, an insert tail grip, a spring, a support element, and a crimp sleeve within an inner core assembly allows the inner core assembly to be pre-assembled with an air-blown microcable, thus fulfilling the requirements for air-blown installation of the microcable. Simultaneously, the structural design of the insert tail grip and the support element enables quick assembly and disassembly of the inner core assembly with the housing. An annular stepped surface limits the retraction path of the insert, thereby preventing damage or breakage of the fiber optic unit due to excessive retraction of the insert and ensuring the reliability of the fiber optic connector in use. Description of the drawings

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings required for these embodiments are briefly presented below. It is obvious that the drawings described below represent only some embodiments of this utility model. Those skilled in the field can derive further drawings from these without any creative effort. Fig. Figure 1 is an exploded view of the structure of the air-blown fiber optic connector in an embodiment of the present utility model; Fig. Figure 2 is a schematic assembly drawing of the air-blown fiber optic connector in an embodiment of the present utility model; Fig. Figure 3 is a sectional view of the assembled structure of the air-blown fiber optic connector in an embodiment of the present utility model; Fig. Figure 4 is an exploded view of the structure of the inner core assembly of the air-blown fiber optic connector in an embodiment of the present utility model; Fig. Figure 5 is a schematic representation of the structure of the use of the inner core assembly in an embodiment of the present utility model; Fig. Figure 6 is a schematic representation of the structure of the insert tail handle of the inner core assembly in an embodiment of the present utility model; Fig. 7, Fig. 8 to Fig. Figures 9 illustrate the assembly of the insert with the insert tail handle within the inner core assembly in an embodiment of the present utility model; Fig. Figure 10 is a schematic representation of the structure of the support element inner core assembly of the embodiment of the present utility model; Fig. 11 to Fig. Figures 12 are schematic representations of the structure of the crimp sleeve of the inner core assembly in an embodiment of the present utility model; Fig. 13, Fig. 14, Fig. 15 to Fig. Figures 16 are schematic representations of the structure of the inner frame sleeve of the air-blown fiber optic connector in an embodiment of the present utility model; Fig. Figure 17 is a schematic representation of the structure of the end sleeve of the air-blown fiber optic connector in an embodiment of the present utility model; Fig. Figure 18 is a schematic representation of the structure of the air-blown fiber optic connector after completion of assembly following air blowing in an embodiment of the present utility model; Fig. Figure 19 is an exploded view of the structure of an LC glass fiber connector which includes an air-blown section in an embodiment of the present utility model;

[0025] In all drawings, the same reference symbols denote identical technical features, in particular: 100. Air-inflatable section; 200. Non-air-inflatable section; 1. Inner core assembly; 2. Air-blown micro cable; 3. Inner frame sleeve; 4. Outer shell; 5. End sleeve; 6. Outer frame sleeve; 101. Insert; 1011. Insert body; 1012. Conductive end face; 1013. Tail handle terminal end; 102. Insert tail handle; 1021. Anti-rotation section; 1022. Sleeve section; 1023. Support section; 1024. Sleeve connection section; 103. Spring; 104. Support element; 105. Crimp sleeve; 106. Dust cap; 201. Fiber optic unit; 202. Outer sheath; 301. Sleeve bore; 302. Anti-rotation hole; 303. Engagement bore; 304. Cantilever notch; 305. Elastic arm; 306. Limiting projection; 307. Marking; 308. End sleeve connection section; 309. Locking projection. Detailed descriptions

[0026] To clarify and explain the objectives, technical solutions, and advantages of this utility model, a more detailed description follows, with reference to the accompanying drawings and embodiments. It is understood that the detailed embodiments described here serve only to illustrate this utility model and are not intended to limit its scope. Furthermore, the technical features described in the various embodiments of this utility model may be combined, provided they do not conflict with one another.

[0027] In the description of this utility model, it should be noted that, unless expressly stated and defined otherwise, the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "top," "bottom," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and similar indications of direction or positional relationship are based on the orientation or positional relationships shown in the accompanying drawings. This information is provided solely to facilitate the description of this utility model and to simplify the description, and is not intended to mean or imply that the devices or elements mentioned must have a specific orientation, be constructed in a specific orientation, or be operated in a specific orientation.Therefore, they should not be interpreted as restrictions on the present utility model.

[0028] Unless expressly stated otherwise, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating relative importance or the number of specified technical features. Thus, a feature designated as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, the term "several" means at least two, for example, two, three, etc., unless expressly stated otherwise.

[0029] In the present utility model, terms such as "assemble," "connect," "couple," and "fasten" are to be interpreted broadly, unless expressly stated and defined otherwise. They may, for example, denote a permanent connection, a detachable connection, or an integral structure; they may refer to a mechanical or electrical connection; they may be direct connections or indirect connections via an intermediate medium; they may represent internal communication between two components or an interactive relationship between two components, unless expressly stated otherwise. For a person skilled in the art, the specific meaning of the aforementioned terms in the context of the utility model is readily apparent in each individual case.

[0030] In the present utility model, the arrangement of the first feature "on" or "below" the second feature, unless expressly stated and defined otherwise, can represent direct contact between the first and second features or indirect contact via an intermediate medium. Furthermore, if the first feature is described as "above," "on," or "on the surface" of the second feature, this also means that the first feature is arranged directly above or diagonally above the second feature, or simply that the first feature is located on a higher horizontal plane than the second feature. If the first feature is described as "below," "under," or "at the bottom edge" of the second feature, this also means that the first feature is arranged directly below or diagonally below the second feature, or simply that the first feature is located on a lower horizontal plane than the second feature.

[0031] The following description refers to the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13, Fig. 14, Fig. 15, Fig. 16, Fig. 17 to Fig. 18, to illustrate the air-blown fiber optic connector according to a preferred embodiment of the present utility model.

[0032] First, the difference between conventional fiber optic connectors and the air-blown fiber optic connectors of the preferred embodiment must be clarified.

[0033] Conventional fiber optic connectors are typically assembled from fiber optic plugs and fiber optic cables. The fiber optic plug generally consists of an inner core assembly with an insert, an inner frame sleeve, an outer shell, an end sleeve, etc. By mounting the fiber optic unit in the fiber optic cable at the rear end of the insert of the inner core assembly and subsequently assembling all parts accordingly, a fiber optic connector with optical communication capability is created.

[0034] In contrast to conventional fiber optic connectors, the air-blown fiber optic connector in the preferred embodiment must not only meet the requirements of optical communication, but also the requirements of air-blowing the fiber optic cable in the air-blown microtube.

[0035] Currently, two specifications of air-blown microtubes are used for the house connection section in technical applications: the 7 mm / 5 mm microtube (7 mm outer diameter / 5 mm inner diameter) and the 5 mm / 3.5 mm microtube (5 mm outer diameter / 3.5 mm inner diameter). Based on practical experience in technical applications, the most suitable diameters for the air-blown section of the connector for the two aforementioned microtubes are approximately 4 mm and 2.8 mm, respectively. Consequently, a square connector (SC connector) with a diameter of 4 mm for air-blown applications with 7 mm / 5 mm microtubes has been developed within the framework of the prior art.

[0036] At the same time, in the preferred embodiment, the fiber optic connector can be used as shown in Fig. The structure shown in Figure 1 is divided into an air-blown section 100 and a non-air-blown section 200. The air-blown section 100 comprises an air-blown microcable 2 and an inner core assembly 1, which is connected to one end of the air-blown microcable 2. By controlling the maximum outer diameter of the inner core assembly 1, it is ensured that the inner core assembly 1 meets the requirements for air blowing in the air-blown microtube. Accordingly, the non-air-blown section 200 comprises an inner frame sleeve 3 with a larger outer diameter, an outer shell 4, and an end sleeve 5. Due to dimensional constraints, it cannot be blown after assembly. Instead, after completion of the air-blowing process, it must be assembled with the inner core assembly 1 at the end of the air-blown microcable 2 to form the fiber optic connector.

[0037] The reason for pre-assembling the inner core assembly 1 with the air-blown microcable 2 is that the assembly process of insert 101 includes procedures such as grinding the insert, crimping the fiber optic cable, etc. Performing these processes directly at the air-blowing site would not only impair the efficiency of the on-site construction work but also fail to effectively guarantee the quality of the assembly of the inner core assembly 1.

[0038] Therefore, in the preferred embodiment of the fiber optic connector, the inner core assembly 1 and the air-blown microcable 2 undergo a factory pre-assembly process. This includes crimping and securing the air-blown microcable 2 to the inner core assembly 1, as well as grinding the insert 101. Thus, if air blowing is required, the factory-pre-assembled air-blown microcable 2 with the inner core assembly 1 can be directly inserted into the air-blown microtube for blowing. At the final position of the microcable routing, the inner core assembly 1 is then assembled with the remaining parts of the fiber optic connector to form a ready-to-use fiber optic connector.

[0039] In particular, the inner core assembly 1 of the fiber optic connector in the preferred embodiment comprises an insert 101, an insert tail handle 102, a spring 103, a support element 104 and a crimp sleeve 105, which are arranged sequentially along the axial direction, as shown in Fig. 4 shown.

[0040] One end of the insert 101 has an insert body 1011 with a conductive end face 1012, while its other end is a tail-handle connection end 1013 for connecting the insert tail-handle 102, as shown in Fig. Figure 5 illustrates this. During the actual installation, the grinding process for the insert 101 requires positional alignment, which is typically performed after the rear end (i.e., the end furthest from the conductive end face 1012) of the insert 101 has been assembled with the insert tail handle 102. The connection between the insert 101 and the insert tail handle 102 is preferably made by an interference fit, wherein the rear end of the insert 101 is inserted into the mounting bore of the interference fit at the end of the insert tail handle 102.

[0041] In the fiber optic connector of the preferred embodiment, the outer diameter of the insert body 1011 is preferably not smaller than that of the tail-handle connection end 1013. For example, in the Fig. In the preferred embodiment shown in Figure 5, the outer diameter of the insert body 1011 is larger than that of the tail handle connection end 1013. In order to simultaneously allow air blowing of the inner core assembly 1 in the 5 mm / 3.5 mm microtube or 7 mm / 5 mm microtube, the outer diameter of the insert body 1011 in the preferred embodiment is preferably no more than 2.5 mm, and the maximum outer diameter of the inner core assembly 1 is preferably no more than 2.8 mm.

[0042] More precisely, in the preferred embodiment, the fiber optic connector is preferably an SC fiber optic connector, wherein the outer diameter of the insert body 1011 is larger than that of the tail-handle connector end 1013, and the outer diameter of the insert body 1011 is 2.5 mm. In the design of the fiber optic connector, the preferred outer diameter of the air bubble should generally not exceed 2.8 mm to allow for an optimal air bubble gap in the air-blown microtube with an outer diameter of 5 mm and an inner diameter of 3.5 mm. In this context, the wall thickness d of the press-fit section on the insert tail-handle 102 would not exceed 0.15 mm (calculated using the formula d = (2.8 - 2.5) / 2) if the rear end of the insert 101 of an SC fiber optic connector were directly press-fitted. This wall thickness is too small and not practically feasible.

[0043] Therefore, in the preferred embodiment, the rear end of the insert core 101 is designed in a reducing form. A tail-handle connection end 1013, whose outer diameter is smaller than that of the insert body 1011, is provided at the end of the insert body 1011 that is furthest from the conductive end face 1012, as shown in Fig. Figure 5 shows the assembly connection between the insert 101 and the insert tail handle 102 is made by an interference fit between the tail handle connecting end 1013 and the end of the insert tail handle 102, as shown in Fig. 7, Fig. 8 to Fig. 9 shown.

[0044] More precisely, in the preferred embodiment, the outer diameter of the tail handle connection end 1013 is preferably between 1.2 mm and 2.2 mm, and even more preferably between 1.2 mm and 1.8 mm. This ensures that the wall thickness of the press-fit section on the insert tail handle 102 is not excessively thin, in particular between 0.3 mm and 0.8 mm, with a further preferred range being between 0.5 mm and 0.8 mm.

[0045] The aforementioned design, based on the tail-handle connector end 1013, ensures that the outer diameter of the SC connector's blown section does not become excessively large. This facilitates routing within 5 mm / 3.5 mm microducts, thus meeting the requirements for routing the SC connector in both microduct types. This improves flexibility in the choice of blown microduct technology, resulting in effective savings of duct resources and a reduction in microduct material costs, thus providing significant economic benefits.

[0046] It is understood that the fiber optic connector can also be a smaller LC connector in addition to the SC connector mentioned above. In this case, the housing of the non-air-insulated section 200 preferably consists exclusively of an outer frame sleeve 6 with a through-hole. The air-insulated section 100 is inserted into the through-hole of the outer frame sleeve 6 after being laid by means of air bubbles via its inner core assembly 1. Accordingly, the fastening element on the outer frame sleeve 6 preferably consists of two elastic clamping arms, which are arranged as shown in Fig. 19 are shown on the outer frame sleeve 6 and are not described in more detail here.

[0047] It is understood that in the LC fiber optic connector, the outer diameter of the insert 101 is generally smaller than in the SC connector, with 1.25 mm being a preferred dimension. In this case, the rear end of the insert 101 does not need to be reduced in diameter and can be directly connected to the insert tail handle 102.

[0048] Furthermore, in the preferred embodiment, one end of the insert tail handle 102 is connected to the tail handle connection end 1013, while the other end is connected to the crimp sleeve 105. Simultaneously, the central section of the insert tail handle 102 has a sleeve section 1022 and a support section 1023, which are arranged coaxially. The outer diameter of the sleeve section 1022 is larger than that of the support section 1023, and an annular stepped surface is formed at their junction.

[0049] Accordingly, one end of the spring 103 is arranged and axially held over the outer circumference of the sleeve section 1022, while its other end projects beyond the annular stepped surface and rests against the support element 104, which is arranged and fitted over the outer circumference of the support section 1023. Simultaneously, the inner diameter of the support element 104 is smaller than the outer diameter of the sleeve section 1022, allowing the annular stepped surface to axially constrain the support element 104. This limits the maximum compression of the spring 103, thus preventing damage or breakage of the fiberglass unit 201 due to excessive retraction of the insert 101.After the inner core assembly 1 has been assembled within the housing, the force transmission is completed by applying pressure to the inner core assembly 1 at the end of the insert 101 until the support element 104 abuts the annular step surface, thanks to the configuration of the annular step surface. This prevents damage to the fiber optic unit 201 and simultaneously allows for quick removal of the inner core assembly 1 from the housing. Consequently, subsequent replacement of the fiber optic connector housing is significantly simplified.

[0050] To ensure easy processing of the spring 103 and the reliability of the subsequent provision of the spring force, the outer diameter of the sleeve section 1022 in the preferred embodiment is preferably no larger than 2.2 mm and even more preferably between 1.2 and 1.8 mm. At the same time, in the preferred embodiment, the outer diameter of the support element 1023 is preferably between 1.0 mm and 1.6 mm and the width of the annular step surface is preferably between 0.2 mm and 0.6 mm.

[0051] Furthermore, the housing of the non-air-blown section of the above-mentioned SC fiber optic connector preferably comprises an inner frame sleeve 3 and an outer shell 4, as shown in Fig. Figure 1 shows that the outer shell 4 can be fitted over the outer circumference of the inner frame sleeve 3 and held in place. The fastening method between the two components can include a snap-fit ​​connection, stop elements, or partially threaded connections, the details of which are not discussed here.

[0052] Accordingly, a through-hole extending axially is formed in the inner frame sleeve 3. Two opposing elastic arms 305 are provided on the inner frame sleeve 3, the two elastic arms 305 enabling axial locking of the support element 104.

[0053] More precisely, in the preferred embodiment, the insert tail handle 102 has, as shown in Fig. Figure 6 shows an axial through-bore which, in its central section, is formed in the axial direction for threading the fiber optic unit 201. Both ends are each equipped with an anti-rotation section 1021 and a sleeve connection section 1024. The anti-rotation section serves to connect to the tail-handle terminal end 1013 at the end of the insert 101, and the sleeve connection section to connect to the crimp sleeve 105.

[0054] In the actual application, the outer diameter of the anti-rotation section 1021 is preferably no larger than 2.8 mm. Furthermore, a mounting bore is formed axially at its end furthest from the sleeve section 1022. This mounting bore is arranged coaxially with the axial through-bore to allow an interference fit with the aforementioned tail-handle terminal end 1013. It is understood that the selection of the inner diameter of the mounting bore corresponds to the outer diameter of the tail-handle terminal end 1013, provided that an interference fit can be achieved between the two. No further explanation is necessary here.

[0055] More precisely, several facets are formed on the outer circumference of the anti-rotation section 1021, each extending from the central section of the anti-rotation section 1021 to the end face of the anti-rotation section 1021 that faces away from the sleeve section 1022. The configuration of the individual facets makes the anti-rotation section 1021 a non-rotatable structure. This ensures that, after the anti-rotation section 1021 is subsequently threaded into the anti-rotation hole 302, whose inner contour corresponds to the outer contour of the anti-rotation section 1021, the anti-rotation section 1021, and thus the entire insert 101, achieves circumferential positioning. This guarantees that the insert 101 engages in the intended direction. This ensures the accuracy of the engagement of the insert 101.

[0056] It is understood that during the actual manufacturing process, the various structural components of the insert tail handle 102 are formed as a single unit, meaning that the non-rotatable structure of the anti-rotation section 1021 is integrally formed. Of course, depending on the specific requirements, it is also possible to first produce a rotatable structure and then machine out the non-rotatable structure; however, this will not be discussed in detail here.

[0057] Furthermore, in the preferred embodiment, the sleeve section 1022 is configured such that the spring 103 is arranged in a slipped position, wherein the outer diameter of the spring 103 is not greater than 2.8 mm; more precisely, the outer diameter of the spring 103 is preferably not greater than that of the anti-rotation section 1021.

[0058] As in Fig. As shown in Figure 3, in the preferred embodiment the support element 104 is arranged around the outer circumference of the support section 1023. The outer diameter of one end or of the middle section of the support element 104 is larger than the inner diameter of the spring 103, so that the end of the spring 103 facing away from the anti-rotation section 1021 can abut the support element 104 and be held by it.

[0059] As a possible example, in the preferred embodiment, the support element 104 is designed as a stepped shaft. It comprises a large-diameter end for abutting the spring 103 and a small-diameter end whose outer diameter is smaller than that of the large-diameter end. At the junction between the large-diameter end and the small-diameter end, an annular stepped surface is formed, as shown in Fig. Figure 10 is shown. The reason for configuring the support element 104 in the manner described above is to facilitate the subsequent axial assembly between the inner frame sleeve 3 and the support element 104, as will be explained in more detail in the following description.

[0060] Of course, in addition to the configuration mentioned above, the support element 104 can be designed in alternative shapes during the design process as needed, provided it meets the requirements for the secure support of the spring 103 and the subsequent adaptation to the elastic arm 305. For example, an annular projection or flange structure is provided in the central section on the outer circumference of the support element 104, forming an annular stepped surface. The elastic arm 305 rests against the inner frame sleeve 3 on this surface to create a position limit.

[0061] As another possible example, in the preferred embodiment, the support element 104 is designed as a cylindrical structure (not shown in the figure). It can be fitted over the outer circumference of the sleeve section 1022 (if no support section 1023 is provided) or of the support section 1023. The outer diameter of the support element 104 is larger than the inner diameter of the spring 103, ensuring that one end of the spring 103 can be pressed firmly against the end of the support element 104. Simultaneously, a circumferential groove is formed on the outer circumference of the middle section of the support element 104. When the support element 104 engages with the two elastic arms 305, the limiting projections 306 of the two elastic arms 305 engage in the aforementioned groove. This enables axial position limitation of the support element 104 within the inner frame sleeve 3.

[0062] It is understood that in the preferred embodiment, the free length of the spring 103 is greater than that of the sleeve section 1022. This ensures that the spring 103 retains sufficient compression space after the inner core assembly 1 has been assembled with the inner frame sleeve 3 (i.e., after the axial positioning of the support element 104). This ensures that the conductive end face 1012 of the insert 101 is pressed firmly against the conductive component of the adapter / connector bushing.

[0063] Furthermore, in the preferred embodiment, the crimp sleeve 105 is as shown in the Fig. 11 to Fig. 12 is shown, configured such that one end is used to connect to the sleeve connection section 1024 at the end of the insert tail handle 102, while the other end is used to crimp and attach to the outer circumference of the air-blown micro cable 2.

[0064] As a possible example, in the preferred embodiment, the insert tail grip 102 is connected to the crimp sleeve 105 by a thread. In particular, an external thread is formed on the outer circumference of the end of the support section 1023, while an internal thread is formed on the inner circumference of one end of the crimp sleeve 105. These two components are then screwed together to achieve a secure fit. Similarly, the other end of the crimp sleeve 105 is crimped to securely attach it to the outer sheath 202 at the end of the air-filled micro cable 2.

[0065] In the actual application, the outer diameter of the sleeve section 1022 is identical to or slightly smaller than the inner diameter of the spring 103. This configuration effectively ensures the stability of the spring 103 when it is fitted over the outer circumference of the sleeve section 1022 at one end, and prevents the end of the spring 103 from wobbling. This ensures the stability of the spring 103 for supporting the insert 101.

[0066] Furthermore, in the preferred embodiment, the crimp sleeve 105 has, as shown in the Fig. 11 and Fig. Figure 12 shows a sleeve configuration. One end serves as a connecting end for joining to the sleeve connection section 1024 at one end of the insert tail handle 102, while the other end serves as a crimp end for securing the blown microcable 2. The connecting end of the crimp sleeve 105 is preferably screwed to the sleeve connection section 1024, the inner diameter of the crimp end being equal to or slightly larger than the outer diameter of the blown microcable 2. This allows the uninsulated blown microcable 2 (i.e., the blown microcable 2 with the outer sheath 202) to be inserted coaxially into the crimp end of the crimp sleeve 105 and secured (by crimping and / or gluing).

[0067] The connection of the crimp sleeve 105 with the rear end (i.e. the sleeve connection section 1024) of the insert tail handle 102 enables the axial position limitation of the support element 104, thus preventing the spring 103 from disengaging from its contact with the support element 104.

[0068] In actual application, as in Fig. As shown in Figure 12, the inner diameters at both ends of the crimp sleeve 105 are preferably different, with the crimp end having a larger inner diameter than the connection end. This creates an annular step at their connection point, which serves as an axial stop when threading the air-blown microcable 2. Depending on the required configuration, the inner diameters at both ends of the crimp sleeve 105 can, of course, be identical, with a limiting section in the middle section having an inner diameter that is smaller than the inner diameters at both ends. This creates two annular steps, each serving to limit the end of the air-blown microfiber cable 2 and to limit the sleeve connection section 1024 at the insertion tail handle 102 during connection.

[0069] In summary, the maximum axial outer diameter of the inner core assembly 1 in the preferred embodiment is no greater than 2.8 mm. This is primarily due to the fact that the outer diameters of the anti-rotation section 1021 of the insert tail handle 102, the spring 103, the support element 104, and the crimp sleeve 105 are no greater than 2.8 mm. Simultaneously, the rear end of the insert 101 is designed as a stepped shank to complement the aforementioned configuration. This ensures that the outer diameter of the insert body 1011 remains unchanged at 2.5 mm and that the tail handle connection end 1013 can be reliably connected to the insert tail handle 102 at the rear end of the insert 101. This guarantees the reliability and functionality of their connection and prevents the formation of weak connection points at their interface.

[0070] In the actual application, the aforementioned inner core assembly 1 and the air-blown microcable 2 are pre-assembled at the factory. For this purpose, one end of the air-blown microcable 2 is stripped to expose the fiber optic unit 201, and the outer coating is removed from the fiber optic unit 201. Simultaneously, the insert 101, the insert tail grip 102, the spring 103, the support element 104, and the crimp sleeve 105 are successively assembled. Subsequently, the fiber optic unit 201 is successively inserted through the crimp sleeve 105, the insert tail grip 102, and the insert body 1011 using an injection molding process. This completes the assembly and connection of the fiber optic unit 201 with the insert 101.By curing the adhesive and surface grinding the insert 101, the inner core assembly 1 can be pre-assembled with the air-blown microcable 2 at the factory, thus creating an air-blown inner core assembly 1 at one end of the air-blown microcable 2. Naturally, during pre-assembly at the factory, processes such as grinding and cleaning the insert 101 are all carried out using established techniques and will not be described in detail here.

[0071] More precisely, to ensure reliable protection of the conductive end face 1012 of the insert 101 during the routing process involving the air blowing of the inner core assembly 1, the inner core assembly 1, in a preferred embodiment, further comprises a dust cap 106. This dust cap can be placed directly onto the outer circumference of the insert body 1011, thereby protecting both the outer circumference of the insert body 1011 and the conductive end face 1012. This ensures that the insert 101 is precisely protected during the air blowing of the microcable, thus preventing contamination and wear of the conductive end face 1012.

[0072] In the actual application, one end of the dust cap 106 is spherical or hemispherical to reduce contact friction between the pre-assembled inner core assembly 1 at the end of the air-blown microcable 2 and the inner wall surface of the air-blown microtube during installation by air blowing. It is understood that in the actual application, the outer diameter of the dust cap 106 is also kept below 2.8 mm.

[0073] Furthermore, in the preferred embodiment, the inner frame sleeve 3 has, as shown in Fig. Figure 13 shows a square sleeve structure with a through-hole running through its central section. This through-hole allows the insertion and assembly of the pre-assembled inner core assembly 1 at the end of the air-blown microcable 2.

[0074] In particular, for the through-hole formed in the central section of the inner frame sleeve 3, its central section is provided with an anti-rotation hole 302, the inner contour of which corresponds to the outer contour of the non-rotatable structure of the anti-rotation section 1021. This allows the pre-assembled inner core assembly 1 to be inserted directly at the rear end of the inner frame sleeve 3, enabling the anti-rotation section 1021 to be aligned and inserted in the anti-rotation hole 302, thus allowing circumferential positioning of the insert 101.

[0075] Simultaneously, an engagement bore 303 is provided on the axial side of the anti-rotation hole 302 (i.e., on the side of the rear end of the inner frame sleeve 3). Its inner diameter is no smaller than the maximum outer diameter of the inner core assembly 1, thus ensuring that the insert tail handle 102 of the inner core assembly 1 and all components connected to this insert tail handle 102 (namely the spring 103, the support element 104, and the crimp sleeve 105) can be fully inserted into the engagement bore 303 when the anti-rotation section 1021 is aligned and engaged with the anti-rotation hole 302.

[0076] Accordingly, the insert body 1011 extends axially into a sleeve bore 301, which is formed at the opposite end of the anti-rotation hole 302. Depending on the actual application requirements, the conductive end face 1012 of the insert body 1011 can, if necessary, protrude from the sleeve opening 301, for example, by 1.85 to 2.15 mm beyond the end face of the inner frame sleeve 3. Of course, under certain special circumstances, the conductive end face 1012 can also be arranged within the sleeve bore 301 as required, but this will not be discussed in detail here.

[0077] In the preferred embodiment, the inner diameter of the sleeve opening 301 is not smaller than the outer diameter of the dust cap 106 and, more precisely, is 4.8 to 4.9 mm. This ensures that, after assembly of the inner core assembly 1 and the inner frame sleeve 3, the dust cap 106 can be placed directly onto the outer circumference of the insert body 1011, thus protecting the insert 101 when not in use.

[0078] In the actual application, the sleeve opening 301 and the anti-rotation hole 302 are preferably pre-formed on an end piece, wherein the inner circumference of the inner frame sleeve 3 has a through-hole along the axial direction. The end piece can be assembled by first machining the central through-holes (i.e., the sleeve bore 301 and the anti-rotation hole 302) and then inserting one end into the through-hole. At the opposite end of the end piece, an engagement bore 303 is formed to allow the assembly and positioning of components of the inner core assembly 1.

[0079] More precisely, in the preferred embodiment, cantilever notches 304 are arranged opposite each other on the outer wall surface of the inner frame sleeve 3. The arrangement of the two cantilever notches 304 creates two opposing elastic arms 305. Limiting projections 306 are provided at the opposite ends of the two elastic arms 305. These projections bear against the annular step surface on the outer circumference of the support element 104 and / or clamp the outer circumference of the support element 104 firmly after the support element 104 has been fully inserted, thus enabling axial position limitation of the support element 104.

[0080] For example, there are in the Fig. In the preferred embodiment shown in Figure 3, the limiting projections 306 of the two elastic arms 305, due to the design of a reducing shaft, both engage with the annular step formed at the end of the support element 104 and clamp the outer circumference of the support element 104, thereby fully ensuring the reliability of the axial position limitation of the support element 104.

[0081] Simultaneously, when the support element 104 is placed on the outer circumference of the support section 1023, its axially limited end face rests against the spring 103 at a specific distance from the end of the sleeve section 1022. This arrangement allows the insert 101 to retract axially by a certain distance, thus ensuring the conductivity quality during the subsequent insertion and assembly of the fiber optic connector. Naturally, the variable-diameter configuration of the sleeve section 1022 and the support section 1023 creates an annular step at their junction. If disassembly of the inner core assembly 1 and the inner frame sleeve 3 is required, applying rearward pressure to the insert 101 causes the support element 104 to bear against the annular step between the sleeve section 1022 and the support section 1023, thereby transferring the applied force to the support element 104.Subsequently, the continued force applied to the insert 101 from the conductive end face 1012 causes the two elastic arms 305 to retract under load, releasing the locking mechanism with the support element 104. Consequently, the inner core assembly 1 can be removed from the inner frame sleeve 3.

[0082] In actual application, the distance between the two limiting projections 306 is less than the maximum outer diameter of the inner core assembly 1. This requires the two elastic arms 305 to be pulled apart when the inner core assembly 1 is inserted into the inner frame sleeve 3, thus ensuring that the two elastic arms 305 exert a certain clamping force on the subsequent clamping object.

[0083] More precisely, in the preferred embodiment, the inner frame sleeve 3 has a marking 307 on its outer wall surface. This marking 307 is formed on the outer wall surface of the inner frame sleeve 3 by methods such as slotting, coating, bonding, etc. It serves to quickly identify the front and back of the inner frame sleeve 3, thus facilitating alignment when inserting the inner core assembly 1.

[0084] Even more preferably, a marking corresponding to the inscription 307 is provided on the outer circumference of the inner core assembly 1. This marking is also preferably arranged on the outer circumference of the anti-rotation section 1021. This arrangement allows direct verification that the marking on the inner core assembly 1 with the inscription 307 is aligned with the inner frame sleeve 3 when the inner core assembly 1 is inserted into the inner frame sleeve 3 and the anti-rotation section 1021 passes over the cantilever notch 304. This prevents situations in which the anti-rotation section 1021 does not engage in the anti-rotation hole 302, thus ensuring the precise assembly of the inner core assembly 1 in the inner frame sleeve 3.

[0085] By inserting the anti-rotation section 1021 into the anti-rotation hole 302 and the clamping action of the support element 104 on the two elastic arms 305, effective circumferential support for the insert tail handle 102 in the inner frame sleeve 3 is provided. This ensures the axial holding force of the insert 101. The support element 104 is arranged over the insert tail handle 102 and, in conjunction with the arrangement of the spring 103, allows the insert 101 to move axially over a certain distance during insertion (whereby the spring 103 is compressed and then retracted). It is understood that the axial displacement of the insert 101 does not exceed the length of the anti-rotation section 1021 inserted into the anti-rotation hole 302.This ensures that the anti-rotation section 1021 always locks securely into the anti-rotation hole 302, thus guaranteeing a stable electrical connection performance of the connector.

[0086] Preferably, an end sleeve connection section 308 is arranged coaxially at the rear end of the inner frame sleeve 3, wherein a corresponding end sleeve 5 is provided, as shown in Fig. Figure 17 shows that a locking projection 309 is provided on the outer circumference of the end sleeve connection section 308, with a corresponding locking hole formed in the end sleeve 5. This arrangement ensures that, as soon as the end sleeve 5 is correctly fitted over the outer circumference of the end sleeve connection section 308, the individual locking projection 309 engages precisely in the respective locking hole.

[0087] In actual application, the number of locking projections 309 is no less than two, for example two, three or more, spaced apart circumferentially. Accordingly, the number of locking holes provided on the end sleeve 5 corresponds to the number of locking projections 309 provided.

[0088] Furthermore, in the preferred embodiment, the air-blown fiber optic connector also comprises an outer shell 4 which, after the assembly of the inner frame sleeve 3 with the inner core assembly 1 is complete, can be slipped over the inner frame sleeve 3, thereby completing the assembly of the fiber optic connector. The configuration and fitting method of the outer shell 4 in the preferred embodiment are conventional techniques and are not described in detail here.

[0089] In the fiber optic connector, after the outer shell 4 has been mounted, the front end of the outer shell 4 is flush with the insertion end of the inner frame sleeve 3. The rear end of the outer shell 4 covers the end of the end sleeve 5 with the locking hole, thus concealing the locking hole of the end sleeve 5. This prevents accidental disassembly or passive loosening of the end sleeve 5 during operation of the fiber optic connector and therefore ensures the reliability of the end sleeve 5's arrangement. Of course, if circumstances require it, the connection between the outer shell 4 and the inner frame sleeve 3 can first be loosened, and then the end sleeve 5 can be removed.

[0090] For the air-blown fiber optic connector in the preferred embodiment, the assembly process is preferably as follows: During the provisioning phase at the factory, the inner core assembly 1, the inner frame sleeve 3, the outer shell 4, and the end sleeve 5 are provided. The insert 101 of the inner core assembly 1 is assembled at its tail handle connection end 1013 with the anti-rotation section 1021 of the insert tail handle 102 via a coaxial press fit, thereby creating the assembled insert assembly; During pre-assembly at the factory, the outer sheath 202 is removed from one end of the air-blown microcable 2, exposing a specific length of the fiber optic unit 201. The surface layer of the fiber optic unit 201 is then removed and set aside. Simultaneously, the insert 101, the insert tail grip 102, the spring 103, the support element 104, and the crimp sleeve 105 are assembled to form the assembled inner core assembly 1. Adhesive is then injected into the through-holes in the central section of the inner core assembly 1 (consisting of the through-hole in the central section of the insert body 1011, the through-hole in the central section of the insert tail grip 102, and the through-hole in the central section of the crimp sleeve 105).The fiber optic unit 201 is then inserted into the inner core assembly 1 from the end of the crimp sleeve 105 until the fiber optic unit 201 is fully assembled and connected to the insert 101. Subsequently, the conductive end face 1012 of the insert 101 and the end of the fiber optic unit 201 are ground. After the grinding of the conductive end face 1012 is complete, the dust cap 106 is placed onto the insert body 1011. During the air blowing phase of the air-blown micro cable 2, the pre-assembled air-blown micro cable 2 with the inner core assembly 1 is laid through air blowing until the end of the air-blown micro cable 2 with the inner core assembly 1 has reached the final position of the laying;

[0091] During assembly of the fiber optic connector, the inner core assembly 1 is first guided through the rear end of the end sleeve 5, which is then fitted around the outer circumference of the air-filled microcable 2. After removing the dust cap 106, the insert 101 is inserted from the rear end of the inner frame sleeve 3. As the insert 101 is inserted into the inner frame sleeve 3, the two elastic arms 305 on the inner frame sleeve 3 spread apart. The insert 101, the anti-rotation section 1021, and the spring 103 of the inner core assembly 1 successively pass the two elastic arms 305 until the anti-rotation section 1021 of the insert tail handle 102 is aligned and inserted into the anti-rotation hole 302.The two elastic arms 305 are then positioned on the annular step surface at the outer circumference of the support element 104 and / or are pressed and clamped onto the outer circumference of the support element 104, thus completing the assembly between the inner core assembly 1 and the inner frame sleeve 3. The end sleeve 5 is then slipped over the end sleeve connection section 308 and secured. The outer shell 4 is then slipped over the circumference of the outer frame sleeve 3, thus completing the assembly of the air-blown fiber optic connector. The resulting fiber optic connector is in . Fig. 18 shown.

[0092] The fiber optic connector in the preferred embodiment of the present utility model is preferably an SC fiber optic connector. The outer diameter of the insert body 1011 of the inner core assembly 1 is 2.5 mm. The maximum outer diameter of the inner core assembly 1 does not exceed 2.8 mm. This allows simultaneous compatibility with air-blown microtubes with an outer diameter of 5 mm / an inner diameter of 3.5 mm and air-blown microtubes with an outer diameter of 7 mm / an inner diameter of 5 mm for air-blowing processes, with the SC fiber optic connector being completed after the air-blowing process. It is understood that the core concept of the fiber optic connector in the preferred embodiment can also be applied to the manufacture of other models and specifications of fiber optic connectors, provided the actual requirements are met.The design specifications of the various components of the fiber optic connector can also be adapted to the actual requirements, which will not be discussed in more detail here.

[0093] The air-blown fiber optic connector of the present utility model is characterized by a compact design and simple assembly, and meets the requirements for air-blown installation. It simplifies the work steps for air-blown installation, reduces the on-site assembly time of the air-blown fiber optic connector, improves the efficiency of air-blown microcable installation, and lowers the application costs of air-blown microcables.

[0094] Furthermore, the optimized structural design and dimensions of the inner core assembly 1 enable the use of SC fiber connectors, while the air-blown microcable 2, pre-assembled with the inner core assembly 1, can be installed within the air-blown microtube with an outer diameter of 5 mm and an inner diameter of 3.5 mm using air blowing. The use of a single compact air-blown microtube during installation simultaneously fulfills the requirements for both SC and LC fiber connectors, increasing the versatility and flexibility of fiber optic cable deployment. Moreover, the improved design of the fiber connectors allows for the replacement of conventional large-format air-blown microtubes with compact alternatives. This results in significant savings in material costs, labor costs, and space requirements, thus offering exceptional practical benefits.

[0095] Experts in this field will immediately recognize that the foregoing description merely illustrates preferred embodiments of the present utility model and is not intended to limit its scope. All modifications, equivalent replacements, and improvements made in accordance with the principles of the present utility model are covered by its scope of protection.

Claims

[1] Air-blown fiber optic connector comprising an air-blown section and a non-air-blown section which are detachable from each other, wherein the air-blown section comprises an inner core assembly and an air-blown micro cable pre-assembled to the inner core assembly, and the non-air-blown section comprises a housing with a through-hole, characterized by , that the inner core assembly comprises an insert, an insert tail handle, a spring, a support element and a crimp sleeve; one end of the insert is an insert body with a conductive end face, while its other end is a tail-handle connector end, with one end of the insert tail-handle being connected to the tail-handle connector end and its other end being connected to the crimp sleeve to secure one end of the air-blown micro cable; and a middle section of the insert tail handle comprises a sleeve section and a support section which are arranged coaxially, wherein the outer diameter of the sleeve section is larger than that of the support section and an annular step surface is formed at the junction of the sleeve section and the support section, while the support element is arranged slipped over the outer circumference of the support section and is held axially by the annular step surface, wherein one end of the spring is arranged slipped over the outer circumference of the sleeve section and held axially and its other end rests against the end of the support element; wherein the through-hole serves for the removable insertion of the inner core assembly, wherein a fastening element is arranged in the through-hole, whereby the support element can be axially locked by the fastening element after the inner core assembly has been fully inserted. [2] Air-blown fiber optic connector according to claim 1, characterized by , that the outer diameter of the insert body is not smaller than the outer diameter of the tail handle connection end; and that the outer diameter of the insert body is not greater than 2.5 mm, and that the maximum outer diameter of the inner core assembly is not greater than 2.8 mm. [3] Air-blown fiber optic connector according to claim 2, characterized by , that the air-blown fiber optic connector is an SC fiber optic connector, wherein the outer diameter of the insert body is larger than the outer diameter of the tail handle connector end; and the outer diameter of the insert body is 2.5 mm, while the outer diameter of the tail handle connector end is between 1.2 mm and 2.2 mm. [4] Air-blown fiber optic connector according to claim 1 or 3, characterized by, that the housing comprises an inner frame sleeve and an outer shell which is to be arranged fitted over the outer circumference of the inner frame sleeve; wherein the through-hole is arranged axially within the inner frame sleeve, and the fastening element consists of two elastic arms arranged opposite each other on the inner frame sleeve, while the support element can be clamped and secured by the two elastic arms after the inner core assembly is inserted into the through-hole. [5] Air-blown fiber optic connector according to claim 4, characterized by , that an annular stepped surface is formed on the outer circumference of the support element, wherein the two elastic arms are able, after the assembly of the inner core assembly and the inner frame sleeve, to rest with their ends on the annular stepped surface and / or to clamp the outer circumference of the support element: or The support element is a circular sleeve structure with an outer diameter larger than the inner diameter of the spring, its end being pressed firmly against the end of the spring after the insert tail handle is fitted, while in the middle section a circumferential groove is formed on the outer circumference of the support element, and the two elastic arms are able to clamp the groove when the inner core assembly and the inner frame sleeve are fully assembled. [6] Air-blown fiber optic connector according to claim 5, characterized by , that the opposing ends of the two elastic arms are each provided with a limiting projection and the distance between the two limiting projections is not greater than the outer diameter of the section of the support element intended for clamping. [7] Air-blown fiber optic connector according to claim 1, characterized bythat the air-blown fiber optic connector is an LC fiber optic connector and the housing is an outer frame sleeve that is provided with a through-hole and a fastening element. [8] Air-blown fiber optic connector according to any one of claims 1 to 3, 5 to 7, characterized by , that the tail handle connection end is connected to one end of the insert tail handle by a press fit; and / or one end of the crimp sleeve is connected to the end of the insert tail handle via a thread; and / or the crimp sleeve is attached to the end of the air-blown micro cable by crimping or gluing; and / or The inner core assembly also includes a dust cap designed to fit over the outer circumference of the insert body. [9] Air-blown fiber optic connector according to any one of claims 1 to 3, 5 to 7, characterized by, that the insert tail handle at the end for connecting the insert comprises an anti-rotation section, wherein the outer diameter of the anti-rotation section is larger than that of the sleeve section and a non-rotatable structure is formed at one end of the anti-rotation section that is away from the sleeve section; wherein, accordingly, the middle section of the through-bore is provided with an anti-rotation hole, the inner contour of which corresponds to the outer contour of the non-rotatable structure and serves to align and insert the insert tail handle within the through-bore. [10] Air-blown fiber optic connector according to claim 4, characterized by, that the non-air-blown section further comprises an end sleeve, wherein an end sleeve connection section is provided at the rear end of the inner frame sleeve, and the end sleeve can be placed onto the end sleeve connection section after the inner core assembly is passed through the end sleeve; and / or The outer circumference of the inner frame sleeve is marked with an inscription, while a marking is arranged on the outer circumference of the insert tail handle that corresponds to the inscription.

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