Connector, adapter and quick-plugging optical fiber connection assembly

Abstract

The invention discloses an adapter and a quick-plugging optical fiber connection assembly, and relates to the field of optical distribution networks. The connector comprises a plug body, the plug body comprises a plug main body provided with a first cavity, an insertion core fixing part and a threaded connection part, and the insertion core fixing part and the threaded connection part are located at the two ends of the plug main body respectively; the plug middle pipe is arranged in the first cavity, and the plug middle pipe is provided with a second cavity; and the optical cable comprises an optical fiber, the optical fiber is accommodated in the second cavity, and the optical fiber and the inner wall of the second cavity are arranged at an interval. By using the optical fiber connecting assembly, the plugging operation of the adapter and the connector can be simply, conveniently and quickly completed, the locking force is reliable, and the problems that the plugging operation of the existing optical fiber connecting assembly is inconvenient, and the locking force is insufficient are effectively solved.

Description

[0001] This application is a divisional application with a filing date of 2018.03.30, an application number of 201810277056.X, and an invention name of a connector, an adapter, and a quick-plug fiber optic connection assembly. Technical Field

[0002] The invention relates to the field of optical distribution networks, in particular to a connector, an adapter and a fast-plug optical fiber connection component. Background Art

[0003] With the large-scale deployment of FTTH (Fiber To The Home), fiber optic connection components are increasingly being used. Generally speaking, fiber optic connection components include fiber optic connectors and adapters. However, most of the fiber optic connectors and adapters currently used are industry standard connectors and adapters. The original design of this type of connector and adapter is to solve the fiber optic connection indoors or in a protective box (box), so there are the following defects in actual use:

[0004] 1. Existing standard connectors and adapters have low pull-off force and cannot meet the connection requirements of optical cables and optical fibers under large pull forces. Therefore, it is generally necessary to use hose clamps, clamps, etc. to additionally fix and protect the optical cables and optical fibers, which undoubtedly makes the connection and plug-in operations inconvenient and also increases the cost of use;

[0005] 2. Existing standard connectors and adapters have poor dust and water resistance and cannot be used outdoors. They can only be used indoors or in environments with protective measures, and have great limitations in use.

[0006] At present, there are a small number of waterproof fiber optic connectors and adapters on the market, but most of them adopt a screw-type locking method. The screw-type locking method has the defects of cumbersome plugging and unplugging operation and limited locking force due to its own characteristics.

[0007] Therefore, how to solve the problems of inconvenient plugging and unplugging operations, insufficient locking force, and waterproof and dustproof problems of existing optical fiber connection components is an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0008] The present application provides a connector, an adapter and a quick-plug optical fiber connection assembly, which can solve the problem of withstanding low pull-out force.

[0009] In a first aspect, an embodiment of the present application provides a connector for optical fiber connection, the connector comprising:

[0010] A plug body, the plug body comprising a plug body provided with a first cavity, a plug core fixing portion and a threaded connection portion, wherein the plug core fixing portion and the threaded connection portion are respectively located at two ends of the plug body;

[0011] A plug middle tube, which is disposed in the first cavity, and the plug middle tube is provided with a second cavity;

[0012] The optical cable comprises an optical fiber, wherein the optical fiber is accommodated in the second cavity and the optical fiber is spaced apart from the inner wall of the second cavity.

[0013] In combination with the first aspect, in one implementation, the first cavity and the optical fiber are configured to satisfy:

[0014] (2R-D / 2)*D / 2=(L / 4) 2 ;

[0015] 4*(2*arctan2D / L)*RL≥0.5;

[0016] Wherein, R is the minimum bending radius allowed by the optical fiber based on optical performance, D is the distance from the axis of the optical fiber to the top of the first cavity, and L is the distance between the ferrule tail handle of the optical fiber in the connector and the stripping point of the optical cable.

[0017] In combination with the first aspect, in one implementation, R is 30 mm, 15 mm or 7.5 mm.

[0018] In combination with the first aspect, in one implementation, when R is 15 mm, the connector is configured so that the radial dimension of the first cavity is greater than 4 mm, and L is greater than 21.5 mm.

[0019] In combination with the first aspect, in one implementation, the ferrule fixing portion, the threaded connection portion and the plug body are integrally provided.

[0020] In combination with the first aspect, in one embodiment, the plug tail tube is threadedly connected to the threaded connection portion, and the plug middle tube is supported between the plug tail tube and the optical fiber ceramic ferrule.

[0021] In combination with the first aspect, in one implementation, the plug tail tube is used to fix the optical cable.

[0022] In combination with the first aspect, in one implementation, an aluminum cup is provided at one end of the plug tail tube away from the plug middle tube, and the aluminum cup is partially sleeved on the plug tail tube and used to fix the optical cable.

[0023] In combination with the first aspect, in one implementation, the plug tail pipe includes a first portion provided with threads and a second portion provided with protrusions, and the aluminum cup is sleeved outside the second portion.

[0024] In combination with the first aspect, in one implementation, a heat shrink tube is further provided on the optical cable, and the heat shrink tube covers the second portion.

[0025] In combination with the first aspect, in one implementation, a heat shrink tube is further provided on the optical cable, and the heat shrink tube is used to seal the gap in the connector.

[0026] In combination with the first aspect, in one implementation, a ceramic ferrule buffer spring is provided on a side of the optical fiber ceramic ferrule close to the first cavity, and the plug middle tube abuts against the ferrule buffer spring.

[0027] In combination with the first aspect, in one implementation, a first step extending in the radial direction is provided at an end of the plug middle tube close to the optical fiber ceramic ferrule.

[0028] In combination with the first aspect, in one embodiment, the end of the plug body having the ferrule fixing portion is also provided with an insertion structure, the insertion structure is formed by integrally extending from the plug body in a direction away from the first cavity, the optical fiber ceramic ferrule portion is arranged in the insertion structure, the cross-section of the insertion structure is circular, and the insertion structure and the optical fiber ceramic ferrule are hollow.

[0029] In combination with the first aspect, in one implementation, the plug middle tube and the plug body are connected in a non-threaded manner.

[0030] In combination with the first aspect, in one implementation, the outer surface of the plug middle tube is in contact with the inner wall of the plug body.

[0031] In combination with the first aspect, in one implementation, a step structure is provided on the outer surface of the plug body, and a first sealing ring is provided between the step structure and the threaded connection portion.

[0032] In combination with the first aspect, in one embodiment, a sealing ring groove, a locking groove and a positioning structure are sequentially provided at the end of the plug body along the axial direction.

[0033] In combination with the first aspect, in one embodiment, the top of the locking groove is higher than the top of the sealing ring groove, and the bottom of the positioning structure is connected to the extension surface of the top of the locking groove.

[0034] In a second aspect, an embodiment of the present application provides another connector for optical fiber connection, which includes:

[0035] A main body, wherein the main body is provided with a cavity;

[0036] An optical cable is assembled in the main body, and the optical cable extends into the cavity;

[0037] The insertion part is located at one end of the main body, and the end of the insertion part away from the main body is provided with an optical fiber ceramic ferrule, and the insertion part is provided with a groove for clamping the adapter matching the connector, and at the same time,

[0038] A pushing device is arranged at the periphery of the inserting portion, and the pushing device is used for pushing the inner sleeve of the adapter matched with the connector.

[0039] In a third aspect, an embodiment of the present application provides an adapter for optical fiber connection, which includes:

[0040] An adapter body, wherein at least one end of the adapter body is a cylindrical docking portion, the docking portion is provided with a docking channel, the adapter body is provided with a ferrule receiving seat for accommodating an optical fiber ceramic ferrule, and the docking portion is provided with a receiving groove communicating with the docking channel;

[0041] A holding body, the holding body being movably received in the receiving groove;

[0042] An outer sleeve movably sleeved outside the docking portion, the outer sleeve having a first state and a second state. When the outer sleeve is in the first state, the outer sleeve abuts against the clamping body and allows a portion of the clamping body to extend irreversibly into the docking channel. When the outer sleeve is in the second state, a clearance space is provided between the outer sleeve and the opening of the receiving groove for the clamping body to exit the docking channel.

[0043] An inner sleeve is movably assembled on the docking portion, and is used to keep the outer sleeve in the first state after being pushed toward the insertion direction.

[0044] In combination with the third aspect, in one embodiment, the adapter body is provided with an orientation section, a locking section and a sealing section in sequence along the axial direction.

[0045] In combination with the third aspect, in one implementation, radial dimensions of the orientation section, the locking section, and the sealing section decrease sequentially.

[0046] In a fourth aspect, an embodiment of the present application provides a quick-plug optical fiber connection assembly, including an adapter and a connector, wherein the adapter includes:

[0047] - an adapter body, wherein at least one end of the adapter body is a cylindrical docking portion, the docking portion is provided with a docking channel, the adapter body is provided with a ferrule receiving seat for accommodating an optical fiber ceramic ferrule, the ferrule receiving seat is located in the middle of the adapter body, and the docking portion is provided with a receiving groove communicating with the docking channel;

[0048] - a holding body, the holding body being movably received in the receiving groove;

[0049] - an outer sleeve movably sleeved outside the docking portion, the outer sleeve having a first state and a second state. When the outer sleeve is in the first state, the outer sleeve abuts against the holding body and allows a portion of the holding body to extend irreversibly into the docking channel. When the outer sleeve is in the second state, a clearance space is provided between the outer sleeve and the opening of the receiving groove for the holding body to exit the docking channel;

[0050] - an inner sleeve movably assembled on the docking portion, the inner sleeve being used to keep the outer sleeve in the first state after being pushed in the insertion direction;

[0051] The connector comprises:

[0052] - a plug body docking with the adapter body, the plug body comprising a plug body with a first cavity, a plug core fixing portion and a threaded connection portion, the plug core fixing portion and the threaded connection portion being located at two ends of the plug body respectively;

[0053] A plug middle tube, which is disposed in the first cavity, and the plug middle tube is provided with a second cavity;

[0054] The optical cable comprises an optical fiber, wherein the optical fiber is accommodated in the second cavity and the optical fiber is spaced apart from the inner wall of the second cavity.

[0055] In a fifth aspect, an embodiment of the present application provides another quick-plug optical fiber connection assembly, including an adapter and a connector, wherein the adapter includes:

[0056] - an adapter body, wherein at least one end of the adapter body is a cylindrical docking portion, the docking portion is provided with a docking channel, the adapter body is provided with a ferrule receiving seat for accommodating an optical fiber ceramic ferrule, the ferrule receiving seat is located in the middle of the adapter body, and the docking portion is provided with a receiving groove communicating with the docking channel;

[0057] - a holding body, the holding body being movably received in the receiving groove;

[0058] - an outer sleeve movably sleeved outside the docking portion, the outer sleeve having a first state and a second state. When the outer sleeve is in the first state, the outer sleeve abuts against the holding body and allows a portion of the holding body to extend irreversibly into the docking channel. When the outer sleeve is in the second state, a clearance space is provided between the outer sleeve and the opening of the receiving groove for the holding body to exit the docking channel;

[0059] - an inner sleeve movably assembled on the docking portion, the inner sleeve being used to keep the outer sleeve in the first state after being pushed in the insertion direction;

[0060] The connector comprises:

[0061] - a main body, the main body being provided with a cavity;

[0062] - an optical cable assembled in the main body, and the optical cable extends into the cavity;

[0063] - an insertion portion at one end of the main body, an end of the insertion portion away from the main body is provided with an optical fiber ceramic ferrule, and a groove for engaging with an adapter matching the connector is provided on the insertion portion, and at the same time,

[0064] - A push-up device is provided on the periphery of the insertion portion, and the push-up device is used to push up the inner sleeve of the adapter matched with the connector; at the same time,

[0065] When the connector is inserted into the adapter, the ejection device abuts against the inner sleeve, and the outer sleeve is kept in the first state, and part of the clamping body is irreversibly extended into the docking channel and clamped in the groove.

[0066] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0067] 1. The locking principle of the present invention uses the cooperation of steel balls and annular grooves for locking. The locking force is greater than that of the snap-on locking device used in existing standard connectors, and is more suitable for complex outdoor scenes. The insertion force required for insertion is small, and the locking force is large when locking. When pulling out, the steel balls and annular grooves are unlocked, and the connector can be pulled out smoothly. The pulling-out force is small, and it has the characteristics of convenient operation, which effectively solves the problems of inconvenient plug-in and pull-out operations and insufficient locking force of existing optical fiber connection components.

[0068] 2. In the present invention, at least one O-ring is embedded in the contact surface between the connector plug body and the adapter body. The design of the O-ring forms a closed space between the connector and the adapter, ensuring that the connector and the adapter can achieve good dust and water resistance after docking, thereby solving the problem that the existing optical fiber connection components have poor dust and water resistance and cannot be used outdoors.

[0069] 3. In the present invention, when the adapter is not docked with the connector, a protective plug can be inserted into the adapter; when the connector is not docked with the adapter, a protective cap can be installed outside the plug body of the connector. The design of the protective plug and the protective cap can provide good dust and water protection for the adapter and the connector when they are not docked, thereby effectively ensuring the service life of the adapter and the connector.

[0070] 4. The present invention can design the optical fiber connection assembly into a "single-end waterproof locking type" or a "double-end waterproof locking type" according to different usage requirements, which has a wide range of uses and is economical and applicable. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] Figure 1 It is a structural schematic diagram of an adapter in an embodiment of the present invention;

[0072] Figure 2 for Figure 1 Section along AA' direction;

[0073] Figure 3 A schematic diagram of the structure of a connector in an embodiment of the present invention;

[0074] Figure 4 for Figure 3 Section along BB' direction;

[0075] Figure 5 is a schematic diagram of the adapter and the connector before docking;

[0076] Figure 6 A schematic diagram of an adapter and a connector in the process of docking and insertion;

[0077] Figure 7 A schematic diagram of the connector being ready to be unplugged from the adapter;

[0078] Figure 8 This is a schematic diagram of the connector being pulled out further after the steel ball is unlocked;

[0079] Fig. 9 A schematic diagram of a structure in which an O-ring is added to a connector and a sealing flat gasket is added to an adapter;

[0080] Fig.10 This is a schematic diagram of the structure of the protective plug inserted into the adapter;

[0081] Fig.11 This is a schematic diagram of the structure of a protective cap mounted outside the connector plug body;

[0082] Fig.12 This is a schematic diagram of the structure of a "single-end waterproof locking type" adapter in an embodiment of the present invention;

[0083] Fig.13 This is a schematic diagram of the structure of a "double-end waterproof locking type" adapter in an embodiment of the present invention;

[0084] Fig.14 is a schematic diagram of a specific embodiment of a connector;

[0085] Fig.15 for Fig.14 Schematic diagram of the connector and the adapter after docking;

[0086] Fig.16 is a schematic diagram of a specific embodiment of a protective cap;

[0087] Fig.17 for Fig.16 Medium protective helmet set Fig.14 Schematic diagram of the connector;

[0088] Fig.18 is a schematic diagram of a specific embodiment of a protective plug;

[0089] Fig.19 for Fig.18 Schematic diagram of the middle protective plug being inserted into the adapter;

[0090] Fig. 20 It is a schematic diagram of a specific embodiment of a holder.

[0091] Reference numerals:

[0092] 1-adapter, 101-adapter body, 101a-docking channel, 101b-receiving groove, 101c-allowing space, 102-ceramic sleeve, 103-directional limiting groove, 104-steel ball, 105-outer sleeve, 105a-holding block, 106-inner sleeve, 107-outer spring, 108-inner spring, 109-outer retaining ring, 110-inner retaining ring, 111-inclined surface, 112-sealing flat gasket;

[0093] 2-connector, 201-plug body, 201a-main body, 201b-cavity, 201c-insertion part, 201d-insertion core fixing part, 201e-plug body, 201f-first cavity, 201g-threaded connection part, 201h-step structure, 201i-first sealing ring, 201j-insertion structure, 201k-positioning key, 202-optical fiber, 203-optical fiber ceramic ferrule, 203a-ferrule tail handle, 204-directional limiting protrusion, 205-plug jacket, 206-pushing device, 207-annular groove, 208-O-type sealing ring, 209-plug middle tube, 209a-second cavity, 209b-first step, 210-plug tail tube, 211-aluminum tube, 212-inner waterproof O-type sealing ring, 213-aluminum cup, 214-optical cable tail sheath, 215-optical cable, 216-heat shrink tube, 217-ceramic ferrule buffer spring;

[0094] 3-protective plug; 4-protective cap, 40-jointing part, 42-insertion core receiving seat, 43-elastic arm, 44-holding block. DETAILED DESCRIPTION

[0095] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0096] Embodiment 1:

[0097] Please also refer to Figures 1 to 19The embodiment of the present invention provides a connector 2 for optical fiber connection. The connector 2 includes a plug body 201, and the plug body 201 is used to carry the optical cable 215 and provide hand-held operation. A plug jacket 205 is provided on the outside of the plug body 201, and the front end of the plug jacket 205 has a push-up device 206; the outer surface of the plug body 201 is provided with a groove for engaging with an adapter that matches the connector. The groove can be an annular groove 207. Compared with the connection method using threads in the prior art, the use of a groove as a connection structure can withstand a greater pull-off force, and does not require rotation, can be directly inserted, and is easy to operate. And because there is no need to rotate, the space required for hand operation is small, which can increase the density of the connector on the panel.

[0098] Embodiment 2:

[0099] Please also refer to Figures 1 to 19 As an optional embodiment, the difference between this embodiment and embodiment 1 is that the pushing device 206 is used to push the inner sleeve 106 of the adapter 1 that is matched with the connector 2, so that the adapter 1 changes state and is connected to the connector. Of course, the pushing device 206 can also push other similar structures of the adapter 1, as long as it can change the state of the adapter 1 and achieve the effect of connection.

[0100] Embodiment 3:

[0101] Please also refer to Figures 1 to 19 As an optional embodiment, the difference between this embodiment and embodiment 1 is that the ejection device 206 is an ejection block formed by extending from the outer surface of the plug body 201. If the ejection device 206 adopts this structure, the inner sleeve 106 matching the ejection device 206 can be provided with a protrusion protruding from the outer sleeve 205 (not shown), so that the ejection device 206 can push the inner sleeve 106 and move axially relative to the outer sleeve 205.

[0102] Embodiment 4:

[0103] Please also refer to Figures 1 to 19 As an optional embodiment, the difference between this embodiment and embodiment 1 is that the ejection device 206 is an ejection sheet spaced apart from the surface of the plug body 201. The ejection sheet can be directly extended into the outer sleeve 205, so that the ejection device 206 can push the inner sleeve 106 and move axially relative to the outer sleeve 205.

[0104] In short, different structures of the ejection device 206 need to be adapted to different inner sleeves 106 , and ultimately the ejection device 206 can push the inner sleeve 106 to move axially relative to the outer sleeve 205 .

[0105] Embodiment 5:

[0106] Please also refer to Figures 1 to 19 Specifically, the difference between this embodiment and embodiment 1 is that the plug body 201 includes:

[0107] The main body 201a is provided with a cavity 201b, and the cavity 201b is used to connect the optical cable 215;

[0108] The inserting part 201c is located at one end of the main body 201a, and the inserting part 201c is provided with a ferrule fixing part 201d at one end away from the main body 201a, and the ferrule fixing part 201d is fixed with an optical fiber ceramic ferrule 203, and the groove is located on the outer surface of the inserting part 201c. The groove, a functional structure for connection, is provided on the inserting part 201c, instead of providing a thread on the outer periphery of the plug as in the prior art, so that the diameter of the adapter can be reduced.

[0109] Furthermore, the groove is located on the outer surface of the region where the inserting portion 201c is provided with the insert fixing portion 201d.

[0110] Since the ferrule fixing part 201d has a greater wall thickness, and after the optical fiber ceramic ferrule 203 is installed in the ferrule fixing part, its strength is greater. When the connector 2 is connected to the adapter 1, the groove will be subjected to radial pressure when the connector 2 is subjected to tension. The groove is arranged here to withstand greater radial force, further improving the ability to withstand pull-off force.

[0111] Specifically, the plug housing 205 is formed by extending the main body 201a toward the insertion portion 201c, and the push-up device 206 is a push-up piece extending from the end of the plug housing 205, and the push-up piece is spaced apart from the insertion portion 201c. Since the push-up piece is spaced apart from the insertion portion 201c, the push-up piece can abut against the inner sleeve 106 and extend between the outer sleeve 105 of the adapter and the docking portion 40, so that the adapter is clamped on the connector.

[0112] Optionally, the groove is an annular groove 207 arranged along the circumference of the plug body 201; or, the groove is a hemispherical groove.

[0113] The use of the annular groove 207 or the hemispherical groove has its own advantages. The annular groove 207 does not require a very strict deflection angle alignment, while the hemispherical groove requires a more precise deflection angle alignment, otherwise it will cause the adapter 1 The clamping body is difficult to accurately clamp at the center position of the hemispherical groove. However, since the hemispherical groove can often be more compatible with the shape of the clamping body, it can provide a better clamping effect, thereby improving the ability to withstand the pull-off force. In this embodiment, in order to facilitate processing, and because the use of the annular groove 207 can already withstand a very high pull-off force, therefore, in the embodiment of the present invention, the annular groove 207 is preferably selected.

[0114] Embodiment 6:

[0115] Please also refer to Figures 1 to 19 The present invention also provides a connector for optical fiber connection, comprising:

[0116] The main body 201a is provided with a cavity 201b;

[0117] An optical cable 215 is assembled in the main body 201a, and the optical cable 215 extends into the cavity 201b;

[0118] The insertion part 201c is located at one end of the main body 201a, and the end of the insertion part 201c away from the main body 201a is provided with an optical fiber ceramic ferrule 203. The insertion part 201c is provided with a groove for engaging with an adapter matching the connector.

[0119] The outer periphery of the inserting portion 201c is provided with a pushing device 206, which is used to push the inner sleeve 106 of the adapter matched with the connector.

[0120] Since the overall strength of the groove is greater than that of the thread, the clamping through the groove can withstand a greater pull-off force, and a push-up device 206 is provided on the periphery of the insertion portion 201c to trigger the connection and locking of the adapter 1. Since there is no need to rotate, it can be directly inserted, which is convenient to operate. In addition, since there is no need to rotate, the space required for manual operation is small, which can increase the density of the connector 2 on the panel.

[0121] Further, the push-out device 206 is a push-out block provided on the outer surface of the inserting portion 201c. If the push-out device 206 adopts this structure, the inner sleeve 106 matching the push-out device 206 may be provided with a protrusion protruding from the outer sleeve 205 (not shown), so that the push-out device 206 can push the inner sleeve 106 and move axially relative to the outer sleeve 205.

[0122] Optionally, the push-up device 206 is a push-up sheet spaced apart from the outer surface of the inserting portion 201c. Since the push-up sheet is spaced apart from the inserting portion 201c, the push-up sheet can abut against the inner sleeve 106 and extend between the outer sleeve 105 of the adapter and the docking portion 40, so that the adapter is clamped on the connector.

[0123] Furthermore, the groove is located on the outer surface of the insertion portion 201c where the optical fiber ceramic ferrule 203 is installed. Since the ferrule fixing portion 201d has a greater wall thickness, and after the optical fiber ceramic ferrule 203 is installed in the ferrule fixing portion, its strength is greater. When the connector 2 is pulled after being connected to the adapter 1, the groove will be subjected to radial pressure. The groove is arranged here to withstand greater radial force, further improving the ability to withstand pull-off force.

[0124] Embodiment 7:

[0125] Please refer to Figure 1-19 The present invention also provides an adapter 1 for optical fiber connection, which comprises:

[0126] An adapter body 101, wherein at least one end of the adapter body 101 is a tubular docking portion 40, wherein the docking portion 40 is provided with a docking channel 101a, and the adapter body 101 is provided with a ferrule receiving seat 42 for accommodating an optical fiber ceramic ferrule 203, wherein the ferrule receiving seat 42 is located in the middle of the adapter body 101, and the docking portion 40 is provided with a receiving groove 101b communicating with the docking channel 101a;

[0127] A holding body, the holding body being movably received in the receiving groove 101b;

[0128] An outer sleeve 105 movably sleeved on the outside of the docking portion 40, the outer sleeve 105 has a first state and a second state. When the outer sleeve 105 is in the first state, the outer sleeve 105 abuts against the holding body, and a part of the holding body is irreversibly extended into the docking channel 101a. When the outer sleeve 105 is in the second state, a clearance space 101c is provided between the outer sleeve 105 and the opening of the receiving groove 101b for the holding body to exit the docking channel 101a.

[0129] The inner sleeve 106 is movably assembled on the docking portion 40 , and the inner sleeve 106 is used to keep the outer sleeve 105 in the first state after being pushed toward the insertion direction.

[0130] Because when the outer sleeve 105 is in the first state, part of the holding body is irreversibly extended into the docking channel 101a, and the part extending into the docking channel 101a is used to cooperate with the groove of the connector 2 to connect and lock the connector 2 and the adapter 1, and because the holding body is held and cannot be withdrawn, the docking channel 101a makes the connection between the connector 2 and the adapter 1 very firm and can withstand very high pulling force.

[0131] Embodiment 8:

[0132] For details, please refer to Figure 1-19Compared with Example 7, specifically, the holding body is a steel ball 104, and the receiving groove 101b is a cylindrical hole. A stop portion is provided at the bottom of the receiving groove 101b, and the stop portion is used to prevent the steel ball 104 from completely falling out of the receiving groove 101b. Specifically, the stop portion is a funnel structure at the bottom of the receiving groove 101b. It is foreseeable that there are many other stopping methods, such as providing a convex point on the inner wall at the bottom of the receiving groove 101b. The steel ball 104 is selected as the holding body because the steel ball itself has high strength and is not easily stuck when moving up and down in the receiving groove 101b. There is also an arc-shaped retracted stop structure at the bottom of the receiving groove 101b, which is used to prevent the holding body from falling out of the receiving groove 101b.

[0133] Furthermore, the outer sleeve 105 is provided with a holding block 105a protruding from the inner wall. When the outer sleeve 105 moves to the first state, the holding block 105a is located at the receiving groove 101b and holds the clamping body. By providing the holding block on the inner wall of the outer sleeve, there is space for the clamping body in other areas except the holding block. Except in the first state, the clamping body will not be held and remain in the first state, and the clamping body can also be completely returned to the receiving groove 101b.

[0134] On the basis of the above technical solution, the side of the abutting block 105a close to the ferrule receiving seat 42 has an inclined surface 111. When the first state is switched to the second state, the inclined surface 111 can guide the holding body downward, making the switching between the first state and the second state smoother.

[0135] Further, the docking portion 40 includes a first section close to the ferrule receiving seat 42 and a second section further extended from the first section, and the radius of the first section is greater than that of the second section. One end of the outer sleeve 105 close to the ferrule receiving seat 42 is sleeved on the first section. When switching between the first state and the second state, the abutment block 105a moves axially on the second section. The diameter difference between the first section and the second section is to form a space for the abutment block 105a to move, reduce the diameter of the outer sleeve 105, and thus reduce the diameter of the entire adapter 1.

[0136] Further, the rear end surface of the inner sleeve 106 is respectively held against the outer sleeve 105 by the outer spring 107. When the outer sleeve 105 is in the first state, the inner sleeve 106 keeps the outer sleeve 105 in the first state by the outer spring 107. It is conceivable that the outer spring 107 can also be replaced by other elastic elements, such as an elastic body, repelling magnets, etc. In this embodiment, a spring is preferably used.

[0137] The outer spring 107 is used to push the outer sleeve 105 forward when the inner sleeve 106 is pushed by the pushing device 206 until the holding body is stuck in the groove. At this time, the outer spring 107 keeps the outer sleeve 105 in place, that is, the outer spring 107 keeps the outer sleeve 105 in the first state, so that the abutment block 105a abuts against the holding body, preventing the holding body from retreating after the connector 2 is subjected to tension, causing the connector 2 and the adapter 1 to separate when they need to be connected.

[0138] Embodiment 9:

[0139] Please refer to Figure 1-Figure 19 As an optional embodiment, an axially arranged inner spring 108 is provided between the inner sleeve 106 and the docking portion 40. The inner spring 108 is provided to allow the inner sleeve 106 and the outer sleeve 105 to rebound backward as a whole after the connector and the adapter are disconnected.

[0140] Further, the elastic force of the outer spring 107 is greater than the elastic force of the inner spring 108. The elastic force of the outer spring 107 is greater than the elastic force of the inner spring 108.

[0141] Specifically, the inner sleeve 106 is assembled between the outer sleeve 105 and the docking portion 40, and the inner sleeve 106, the outer sleeve 105 and the docking portion 40 can slide relative to each other in pairs, so that the adapter 1 can switch between the first state and the second state.

[0142] Further, a retaining ring is provided at the end of the surface of the outer sleeve 105 and the butt joint 40 facing the inner sleeve 106. The retaining ring prevents the inner sleeve 106 from being pushed out of the outer sleeve 105 by the inner spring 108 and the outer spring 107.

[0143] Embodiment 10:

[0144] Please refer to Fig. 20 As an optional embodiment. The clamping body includes an elastic arm 43 extending from the docking portion 40, and a clamping block 44 is provided at the end of the elastic arm 43; when the outer sleeve 105 is in the first state, the elastic arm 43 is in a state of not sending elastic deformation, and the clamping block 44 is completely received in the receiving groove 101b. When the outer sleeve 105 is in the first state, the outer sleeve 105 is held against the clamping block 44, and the clamping block 44 partially extends into the docking channel 101a.

[0145] Compared with the clamping method using steel balls, the clamping block 44 is provided at the end of the elastic arm 43 so that the clamping block 44 can automatically withdraw from the docking channel 101a when the outer sleeve 105 retreats to the second state. However, due to the friction of the elastic arm 43 on the outer sleeve 105, the conversion between the first state and the second state requires a greater force.

[0146] Embodiment 11:

[0147] The present invention further provides a quick-plug optical fiber connection assembly, comprising an adapter 1 and a connector 2 , wherein the adapter 1 comprises an adapter body 101 , a holding body, an outer sleeve 105 and an inner sleeve 106 .

[0148] At least one end of the adapter body 101 is a tubular docking portion 40, the docking portion 40 is provided with a docking channel 101a, the adapter body 101 is provided with a ferrule receiving seat 42 for accommodating the optical fiber ceramic ferrule 203, the ferrule receiving seat 42 is located in the middle of the adapter body 101, and the docking portion 40 is provided with a receiving groove 101b connected to the docking channel 101a;

[0149] The card holder is movably received in the receiving groove 101b;

[0150] The outer sleeve 105 is movably sleeved outside the docking portion 40. The outer sleeve 105 has a first state and a second state. When the outer sleeve 105 is in the first state, the outer sleeve 105 abuts against the holding body, and a part of the holding body is irreversibly extended into the docking channel 101a. When the outer sleeve 105 is in the second state, a clearance space 101c is provided between the outer sleeve 105 and the opening of the receiving groove 101b for the holding body to exit the docking channel 101a.

[0151] An inner sleeve 106 movably assembled on the docking portion 40, the inner sleeve 106 is used to keep the outer sleeve 105 in the first state after being pushed in the insertion direction;

[0152] Connector 2 includes:

[0153] The main body 201a is provided with a cavity 201b;

[0154] An optical cable 215 is assembled in the main body 201a, and the optical cable 215 extends into the cavity 201b;

[0155] The inserting part 201c is located at one end of the main body 201a. The end of the inserting part 201c away from the main body 201a is provided with an optical fiber ceramic ferrule 203. The inserting part 201c is provided with a groove for engaging with an adapter matching the connector.

[0156] - The outer periphery of the inserting portion 201c is provided with a pushing device 206, and the pushing device 206 is used to push the inner sleeve 106 of the adapter matched with the connector; at the same time,

[0157] When the connector 2 is inserted into the adapter 1, the ejection device 206 abuts against the inner sleeve 106, and the outer sleeve 105 remains in the first state, and a portion of the clamping body irreversibly extends into the docking channel 101a and is clamped in the groove.

[0158] The connection method using the clamping body and the groove has a stronger locking force than the buckle locking device used in the existing standard connector, is more suitable for complex outdoor scenes, and can withstand greater pull-off force. In addition, the insertion force required for insertion is small, the locking force is large when locking, and the connector can be pulled out smoothly when unplugging, with a small pulling force, and has the characteristics of convenient operation, which effectively solves the problems of inconvenient plug-in and unplugging operations and insufficient locking force of existing optical fiber connection components.

[0159] Example 12: See Figures 1 to 8 As shown, an embodiment of the present invention provides a quick-plug optical fiber connection assembly, including an adapter 1 and a connector 2. Figure 1 As shown, the adapter 1 includes an adapter body 101 whose two ends can be connected to the connector 2. The adapter body 101 contains a ceramic sleeve 102 required for connecting to the optical fiber ceramic ferrule 203 of the connector 2. Any end of the adapter body 101 has a locking structure, and the locking structure includes a directional limiting groove 103 opened on the inner side wall of the adapter body 101. Figure 2 As shown in the figure, the steel ball 104 embedded in the outer wall of the adapter body 101 is preferably a stainless steel ball, an outer sleeve 105 sleeved on the outside of the adapter body 101 and pressed on the steel ball 104, and an inner sleeve 106 arranged between the adapter body 101 and the outer sleeve 105; the directional limiting grooves 103 are evenly distributed in a plurality of ways along the circumference of the adapter body 101. In this embodiment, there are three evenly distributed ways, and the specific number can be set according to actual conditions. It is used to locate the rotation direction of the connector 2 when docking, ensure accurate docking with the end face of the optical fiber ceramic ferrule 203 of the connector 2 and guide the docking of the connector 2; the rear end face of the inner sleeve 106 is respectively connected to the outer spring 107 and the inner spring 108 through the outer spring 107 and the inner spring 108. The sleeve 105 and the adapter body 101 are against each other, and the elastic force of the outer spring 107 is greater than the elastic force of the inner spring 108. The front end face of the inner sleeve 106 is against the outer sleeve 105 and the adapter body 101 through the outer retaining ring 109 and the inner retaining ring 110 respectively, so as to ensure that the inner sleeve 106 will not pop out relative to the outer sleeve 105 and the adapter body 101 under the action of the two springs; and the outer sleeve 105, the adapter body 101 and the inner sleeve 106 can slide relative to each other along the insertion direction of the connector 2, and the inner side wall of the outer sleeve 105 has a slope 111, which is used to press the steel ball 104 into the connector 2 through the slope 111 after the outer sleeve 105 slides to lock the connector 2.

[0160] See also Figure 3As shown, the connector 2 includes a plug body 201, the plug body 201 contains an optical fiber 202, the front end of the optical fiber 202 is connected to an optical fiber ceramic ferrule 203, and the front end surface of the optical fiber ceramic ferrule 203 is exposed outside the plug body 201. Figure 4 As shown, the outer surface of the plug body 201 is provided with directional limiting protrusions 204 that are compatible with the directional limiting grooves 103 of the adapter 1. The specific distribution position and number of the protrusions are compatible with the directional limiting grooves, and are used to cooperate with the directional limiting grooves 103 during docking to play a guiding role and ensure the rotation direction of the connector 2 during docking; a plug jacket 205 is provided on the outside of the plug body 201, and the front end of the plug jacket 205 has a protruding push-up device 206, which is used to cooperate with the inner sleeve 106 of the adapter 1 during docking to push the inner sleeve 106 to slide along the insertion direction relative to the adapter body 101; the outer surface of the plug body 201 is provided with a circle of annular grooves 207 along its circumference, which are used to cooperate with the steel balls 104 during docking to play a clamping and locking role. When the adapter 1 is docked with the connector 2, the pushing device 206 of the connector 2 pushes the inner sleeve 106 of the adapter 1 to slide along the insertion direction relative to the adapter body 101. At the same time, the outer sleeve 105 also slides along the insertion direction of the connector 2 under the action of the outer spring 107. After sliding, the outer sleeve 105 presses the steel ball 104 into the annular groove 207 of the connector 2 through the inclined surface 111 of its inner wall and clamps it, thereby achieving the purpose of locking the connector 2.

[0161] Specifically, see Figure 5 As shown, when the adapter 1 and the connector 2 are in a state before docking, the outer spring 107 and the inner spring 108 of the adapter 1 are both in an uncompressed state. The uncompressed state referred to here does not include the pre-compressed state of the spring after assembly. Generally, the spring is in a pre-compressed state relative to its original length after installation; the outer sleeve 105 of the adapter 1 is in a state where the steel ball 104 is not compressed. At this time, the steel ball 104 can move in the gap between the outer sleeve 105 and the adapter body 101, ensuring that the steel ball 104 will not affect the insertion of the connector 2 before the annular groove 207 of the connector 2 reaches the predetermined position.

[0162] See also Figure 6As shown, when the adapter 1 and the connector 2 are in the process of docking and insertion, the protruding push device 206 on the connector 2 pushes the inner sleeve 106 of the adapter 1 to slide in the direction of the connector 2 insertion, and because the elastic force of the outer spring 107 is greater than the elastic force of the inner spring 108, the sliding of the inner sleeve 106 first compresses the inner spring 108, and the outer sleeve 105 is pushed by the outer spring 107 to slide in the direction of the connector 2 insertion. When the connector 2 is in the predetermined position, the outer sleeve 105 is also in a state of pressing the steel ball 104. At this time, the sliding outer sleeve 105 presses the steel ball 104 into the annular groove 207 of the connector 2 through the inclined surface 111 of its inner side wall and clamps it. The steel ball 104 cooperates with the annular groove 207 of the connector 2, so that the adapter 1 and the connector 2 cannot move, thereby completing the locking operation of the connector 2.

[0163] See also Figure 7 As shown, when the connector 2 is to be pulled out from the adapter 1, the outer sleeve 105 of the adapter 1 is first slid by hand in the direction of the connector 2 being pulled out, so that the steel ball 104 can move up and down in the gap between the outer sleeve 105 and the adapter body 101, in order to unlock the steel ball 104 and the annular groove 207 of the connector 2. Figure 8 As shown, when the steel ball 104 is in the unlocked state, the connector 2 continues to be moved in the direction of being pulled out. At this time, the steel ball 104 is disengaged from the annular groove 207 of the connector 2 and has no locking function. The connector 2 can be smoothly pulled out from the adapter 1.

[0164] Through the above operation, the plugging and unplugging operation of the adapter 1 and the connector 2 can be completed simply and quickly, and the locking force is reliable, which effectively solves the problems of inconvenient plugging and unplugging operation and insufficient locking force of existing optical fiber connection components.

[0165] On the basis of the above, in order to solve the problem that the existing standard connector 2 and adapter 1 have poor dust and water resistance, see Fig. 9 As shown, at least one O-ring 208 is embedded in the contact surface between the plug body 201 of the connector 2 and the adapter body 101. The design of the O-ring 208 makes the connector 2 and the adapter 1 have a certain degree of contact. Fig. 9The area to the left of the middle O-ring forms a closed space, which ensures that the connector 2 and the adapter 1 can achieve good dustproof and water-repellent effects after docking; in addition, when the adapter 1 is installed on the installation interface, the contact surface between the adapter body 101 and the installation interface is provided with a sealing flat gasket 112, and the design of the sealing flat gasket 112 also ensures that the adapter 1 and the installation interface have good dustproof and water-repellent effects. In this embodiment, the O-ring 208 and the sealing flat gasket 112 are made of rubber or silicone. In addition, two O-rings 208 are provided to form a double O-ring 208 design.

[0166] Furthermore, it is understood that in practical applications, Fig.10 As shown, when the adapter 1 is not connected to the connector 2, a protective plug 3 can be inserted into the adapter 1. The protective plug 3 has a push-out device 206, an annular groove 207 and an O-ring 208 with the same structure as those in the connector 2. Similarly, it can be understood that in actual applications, Fig.11 As shown, when the connector 2 is not docked with the adapter 1, a protective cap 4 can be sleeved on the plug body 201 of the connector 2, and the protective cap 4 is connected to the plug jacket 205 of the connector 2 through threads.

[0167] Furthermore, it is understandable that in practical applications, the optical fiber connection assembly can be designed as a "single-end waterproof locking type" or a "double-end waterproof locking type" according to the use requirements. Fig.12 As shown, the "single-end waterproof locking type" means that one end of the adapter body 101 has a locking structure for docking with the above-mentioned dustproof, waterproof and locking connector 2, and the other end does not have a locking structure for docking with the existing standard connector 2. Fig.13 As shown, the "double-end waterproof locking type" means that both ends of the adapter body 101 have locking structures, both of which are used to connect with the above-mentioned connector 2 with dustproof, waterproof and locking functions.

[0168] In addition, it is understandable that the adapter body 101 of the present invention can be selected from the current industry standard adapter body 101, including SCSquare Connector, square fiber connector type, FCFerule Connector, sleeve connector type, single LCLucent Connector, Lucent connector type, double LC type, E2000 type, etc. According to the different end face grinding methods of the optical fiber ceramic ferrule 203, the connector 2 can be divided into UPC type ferrule body end face as super physical end face and APC type ferrule body end face as angle physical end face. Therefore, the connector 2 of the present invention adapted to the industry standard adapter body 101 can be divided into SC-APC / UPC type, FC-APC / UPC type, single LC-APC / UPC type, double LC-APC / UPC type, E2000-APC / UPC type, etc.

[0169] In order to better understand the present invention, the above optical fiber connection assembly is further described in detail below through several specific embodiments.

[0170] See also Fig.14 As shown, it shows an embodiment of a connector 2, which can be divided into UPC type and APC type according to different end surface grinding methods of the optical fiber ceramic ferrule 203. The connector 2 specifically includes:

[0171] O-type sealing ring 208, which is embedded in the plug body 201 and made of silicone material, and is provided with two circles of O-type sealing ring 208 according to the waterproof degree requirement;

[0172] The optical fiber ceramic ferrule 203 can be divided into UPC and APC according to the polishing method of its end face;

[0173] The ceramic ferrule buffer spring 217 is used to provide buffer protection for the optical fiber ceramic ferrule 203 when the connector 2 is docked with the adapter 1;

[0174] The plug body 201 has the following features: an O-ring 208 installation groove, an annular groove 207, and a directional limiting protrusion 204;

[0175] The plug cover 205 is used to protect the stripped optical fiber cable. A protruding push device 206 is provided at the front end of the plug cover 205 to push the inner sleeve 106 on the adapter 1 when the adapter 1 is inserted.

[0176] The plug middle tube 209 is used to protect the stripped optical fiber cable;

[0177] The plug tail tube 210 is used to protect the stripped optical fiber cable and cooperate with the aluminum cup 213 to fix the outer skin of the optical cable 215;

[0178] The optical fiber 202 is the exposed optical fiber after the optical cable 215 is stripped;

[0179] The aluminum tube 211 is used to cooperate with the aluminum cup 213 to fix the aramid sand or tensile metal wire in the optical cable 215;

[0180] The inner waterproof O-type sealing ring 212 is used to prevent water at the tail end of the connector 2 from entering the plug middle tube 209 and the plug tail tube 210, thereby ensuring the waterproof effect inside the connector 2;

[0181] The aluminum cup 213 is used to cooperate with the plug tail tube 210 and the aluminum tube 211 to fix the outer skin of the optical cable 215 and the aramid sand or tensile metal wire respectively;

[0182] The optical cable tail sheath 214 is used for buffering when the optical cable 215 is bent to prevent damage to the optical fiber caused by excessive bending, and can be made of soft plastic or metal spring;

[0183] Optical cable 215;

[0184] The heat shrink tube 216 is used to seal the gap between the optical cable and the parts after the optical cable is fixed. Its protection performance can reach IP68, which is the highest level of the connector waterproof grade standard.

[0185] Among them, the plug body 201 includes a plug body 201e with a first cavity 201f, a core fixing portion 201d and a threaded connection portion 201g. The core fixing portion 201d and the threaded connection portion 201g are respectively located at both ends of the plug body 201e and are integrally arranged with the plug body 201e. The core fixing portion 201d is provided with an optical fiber ceramic core 203.

[0186] The plug middle tube 209 is disposed in the first cavity 201f; the plug tail tube 210 is threadedly connected to the threaded connection portion 201g, and the plug middle tube 209 is held between the plug tail tube 210 and the optical fiber ceramic ferrule 203.

[0187] In this embodiment, the rear end of the plug body 201 integrally extends to the plug tail tube 210, and is connected to the plug tail tube 210 by screwing, thereby ensuring a firm connection between the optical cable and the connector main structure. The connector main structure and the optical cable 215 are sealed by a heat shrink tube 216, so that the optical cable 215 and the connector body form a reliable seal.

[0188] It is understandable that since the threaded connection part is the plug tail tube 210, when it is screwed, it will drive the plug middle tube 209 to move linearly, so the plug middle tube 209 will not generate a torsional force to transmit torque to the optical fiber ceramic ferrule 203 to affect the optical performance.

[0189] In specific implementation, a ceramic ferrule buffer spring 217 is provided on the side of the optical fiber ceramic ferrule 203 close to the first cavity 201f, and the plug middle tube 209 abuts against the ferrule buffer spring 217. In this embodiment, since a segmented cavity is provided inside the plug body 201, the front cavity passes through the optical fiber ceramic ferrule 203, and the rear cavity (first cavity 201f) is used to accommodate the plug middle tube 209, the plug middle tube 209 abuts against the ceramic ferrule buffer spring 217 and is provided with a second cavity 209a to allow the ferrule tail handle to pass through. Since the plug middle tube 209 is pushed by the plug tail tube 210 to move linearly, the installation method of the plug middle tube 209 does not involve a screwing operation, and will not cause the ceramic ferrule buffer spring 217 to twist and transmit torque to the optical fiber ceramic ferrule 203 to affect the optical performance.

[0190] In addition, since the ferrule fixing portion 201d, the threaded connection portion 201g and the plug body 201e are an integral extension structure, and the structure of the ceramic ferrule buffer spring 217 is contained in the cavity of the plug body 201, the ferrule fixing portion 201d and the plug body 201e do not need to be sealed when assembled, thereby reducing the number of sealing points. This well solves the problems of the current plug body 201 having a large number of parts, a complex assembly process, an increased risk of failure due to too many sealing points, and high costs.

[0191] Furthermore, in one embodiment, the end of the plug middle tube 209 close to the optical fiber ceramic ferrule 203 is provided with a first step 209b extending in the radial direction. The first step 209b can be provided to support the ceramic ferrule buffer spring 217 on the one hand, and can constrain the ferrule tail handle of the optical fiber ceramic ferrule 203 on the other hand, so as to ensure the coaxiality of the optical fiber and the optical fiber ceramic ferrule 203 when they are connected.

[0192] Furthermore, in one embodiment, the plug tail tube 210 is also used to fix the optical cable 215. Specifically, an aluminum cup 213 is provided at one end of the plug tail tube 210 away from the plug middle tube 209. The aluminum cup 213 is partially sleeved on the plug tail tube 210 and is used to fix the optical cable 215. Preferably, the plug tail tube 210 includes a first portion with a thread and a second portion with a protrusion, and the aluminum cup 213 is sleeved outside the second portion.

[0193] Furthermore, in one embodiment, the optical cable 215 also includes an optical fiber 202 ; the plug middle tube 209 is provided with a second cavity 209 a , the second cavity 209 a accommodates the optical fiber 202 , and the inner wall of the second cavity 209 a is spaced apart from the optical fiber 202 .

[0194] It is worth noting that the second cavity 209a is a cavity with a certain radial and axial space, allowing the optical fiber to form a microbend inside. Since the ferrule will retreat to a certain extent when the connector is docked, and in order to adapt to the optical fiber retreat of the tight-wrapped structure optical cable during long-term use, the optical fiber in the connector cannot be in a tight state, and it is best to have a certain microbend. Therefore, in order to ensure that the pre-connected product has better performance, the second cavity 209a is set in this embodiment to allow the optical fiber to form a microbend inside.

[0195] Specifically, the wall thickness of the plug tube (209) can be made thin enough, or the plug tube 209 can be opened. In this case, the first cavity 201f and the optical fiber 202 are configured to meet the following requirements:

[0196] (2R-D / 2)*D / 2=(L / 4)2;

[0197] 4*(2*arctan2D / L)*RL≥0.5;

[0198] Wherein, R is the minimum bending radius allowed by the optical fiber 202 based on optical performance, D is the distance from the axis of the optical fiber 202 to the top of the first cavity 201f, and L is the distance from the ferrule tail handle of the optical fiber 202 in the connector to the optical cable stripping point.

[0199] Obviously, within a certain range, the larger L and D are, the larger the allowable bending radius R is, and the less the optical performance of the optical fiber is affected by bending. However, the larger L and D are, the larger the size of the connector is, the higher the product cost is, and the lower the convenience of use is. Therefore, L and D need to be within a certain range.

[0200] Among them, R is determined according to the type of optical fiber. Different optical fiber types allow different minimum bending radius. The minimum bending radius of G652D is 30mm, the minimum bending radius of G657A1 is 15mm, and the minimum bending radius of G657A2 is 7.5mm.

[0201] The most commonly used fiber types for pre-connected products are G657A1 or G657A2. Since the bending radius allowed by G657A2 is smaller, as long as the bending radius of G657A1 is met, G657A2 can be met. Therefore, R = 15mm can be selected.

[0202] From the above formula, it can be known that the theoretical minimum value of D is 2mm, and the theoretical minimum value of L is 21.5mm. Therefore, in this embodiment, the radial dimension of the first cavity 201f is H=2D>4mm, and L>21.5mm. It can be understood that the optical performance of the connector is better when the above conditions are met.

[0203] Furthermore, in one embodiment, the plug middle tube 209 is connected to the plug body 201 in a non-threaded manner. Thus, the plug middle tube 209 will not damage the inner wall of the plug body 201 when the plug body 201 moves. In addition, the outer surface of the plug middle tube 209 fits the inner wall of the plug body 201, thereby preventing the plug middle tube 209 from shaking in the plug body 201.

[0204] Furthermore, in one embodiment, a second step 201h is provided on the outer surface of the plug body 201e, and a first sealing ring 201i is provided between the second step 201h and the threaded connection portion 201e.

[0205] Furthermore, in one embodiment, one end of the plug body 201 having the ferrule fixing portion 201d is also provided with an insertion structure 201j, and the insertion structure 201j is formed by integrally extending from the plug body 201e in a direction away from the first cavity 201f, and the optical fiber ceramic ferrule 203 is partially disposed in the insertion structure 201j, and the cross-section of the insertion structure 201j is circular, and the space between the insertion structure 201j and the optical fiber ceramic ferrule 203 is hollow.

[0206] The present application does not use the SC plug body (standard small white), so that a sealing structure can be provided at the front end of the plug body 201, and it is also convenient to realize the integrated extension of the plug body 201 to the plug tail pipe 210. At the same time, the number of parts can be reduced and the cost can be reduced.

[0207] Furthermore, in one embodiment, a sealing ring groove, a locking groove and a positioning structure are sequentially provided at the end of the plug body 201 along the axial direction. Specifically, an O-ring 208, an annular groove 207 and a positioning key 201k are sequentially provided at the outer front end of the plug body 201, the top of the annular groove 207 is higher than the top of the sealing ring groove, and the bottom of the positioning key structure is connected with the cylindrical surface extending from the top of the annular groove 207, so that when the connector is inserted into the adapter, the sealing ring will not be scratched by the limiting structure before falling into the sealing position.

[0208] Since the connector is provided with a positioning key 201k, and the positioning key 201k is located behind the annular groove 207, the adapter can be provided with a directional limiting groove 103 on its outer side, so that the limiting function can be completed without a separate limiting part, and it is easy to manufacture.

[0209] See also Fig.15As shown, it shows an embodiment after the above-mentioned connector 2 is docked with the adapter 1. As shown in the figure, after the connector 2 is docked with the adapter 1, the outer sleeve 105 of the adapter 1 presses the steel ball 104 into the annular groove 207 of the connector 2 through the inclined surface 111 of its inner wall and clamps it. The steel ball 104 cooperates with the annular groove 207 of the connector 2, so that the adapter 1 and the connector 2 cannot move, thereby achieving the effect of clamping and locking, and the locking force is reliable. Corresponding to the connector 2, the adapter body 101 is provided with an orientation section, a locking section and a sealing section in sequence along the axial direction. The radial dimensions of the orientation section, the locking section and the sealing section decrease in sequence.

[0210] See also Fig.16 As shown in FIG. 4 , an embodiment of a protective cap 4 is shown. The left end of the protective cap 4 is provided with a ring structure for fixing a traction rope or other traction tools of the optical fiber cable in the pipeline. Fig.17 As shown, it shows an embodiment in which the protective cap 4 is mounted on the connector 2. As shown in the figure, the protective cap 4 is connected to the plug jacket 205 of the connector 2 through threads, and thread glue is added to the threads to ensure firmness and waterproofness after connection.

[0211] See also Fig.18 As shown in FIG. 1 , an embodiment of a protective plug 3 is shown. As shown in the figure, the protective plug 3 has a push-out device 206, an annular groove 207 and an O-ring 208 with the same structure as the connector 2 described above. Fig.19 As shown, it shows an embodiment of the above-mentioned protective plug 3 being inserted into the adapter 1. As shown in the figure, after the above-mentioned protective plug 3 is inserted into the adapter 1, the pushing device 206 of the protective plug 3 pushes the inner sleeve 106 of the adapter 1, thereby making the outer sleeve 105 of the adapter 1 slide in the insertion direction, and presses the steel ball 104 into the annular groove 207 of the above-mentioned protective plug 3 through the inclined surface 111 of its inner wall and clamps it. The steel ball 104 cooperates with the annular groove 207 of the protective plug 3, so that the adapter 1 and the protective plug 3 cannot move, thereby achieving the effect of clamping and locking, and the locking force is reliable.

[0212] The present invention is not limited to the above-mentioned embodiments. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the protection scope of the present invention.

[0213] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A connector for optical fiber connection, characterized in that: The connector comprises: A plug body (201), the plug body (201) comprising a plug body (201e) provided with a first cavity (201f), a core fixing portion (201d) and a threaded connection portion (201g), the core fixing portion (201d) and the threaded connection portion (201g) being respectively located at two ends of the plug body (201e); A plug middle tube (209), which is disposed in the first cavity (201f), and the plug middle tube (209) is provided with a second cavity (209a); An optical cable (215) comprises an optical fiber (202), wherein the optical fiber (202) is accommodated in the second cavity (209a), and the optical fiber (202) is spaced apart from the inner wall of the second cavity (209a).

2. The connector according to claim 1, wherein: The first cavity (201f) and the optical fiber (202) are configured to satisfy: (2R-D / 2)*D / 2=(L / 4) 2 ; 4*(2*arctan2D / L)*RL≥0.5; Wherein, R is the minimum bending radius allowed by the optical fiber (202) based on optical performance, D is the distance from the axis of the optical fiber (202) to the top of the first cavity (201f), and L is the distance between the ferrule tail handle of the optical fiber (202) in the connector and the optical cable stripping point.

3. The connector according to claim 2, wherein: The R is 30 mm, 15 mm or 7.5 mm.

4. The connector according to claim 3, wherein: When R is 15 mm, the connector is configured so that the radial dimension of the first cavity (201f) is greater than 4 mm, and L is greater than 21.5 mm.

5. The connector according to claim 1, wherein: The insert fixing portion (201d), the threaded connection portion (201g) and the plug body (201e) are integrally arranged.

6. The connector according to claim 1, wherein: Also includes: The plug tail tube (210) is threadedly connected to the threaded connection portion (201e) and holds the plug middle tube (209) between the plug tail tube (210) and the optical fiber ceramic ferrule (203).

7. The connector according to claim 6, wherein: The plug tail tube (210) is used to fix the optical cable (215).

8. The connector according to claim 7, wherein: An aluminum cup (213) is provided at one end of the plug tail tube (210) away from the plug middle tube (209); the aluminum cup (213) is partially sleeved on the plug tail tube (210) and is used to fix the optical cable (215).

9. The connector according to claim 8, wherein: The plug tail pipe (210) comprises a first portion provided with threads and a second portion provided with protrusions, and the aluminum cup (213) is sleeved outside the second portion.

10. The connector according to claim 9, wherein: A heat shrink tube (216) is also provided on the optical cable (215), and the heat shrink tube (216) covers the second portion.

11. The connector according to claim 1, wherein: A heat shrink tube (216) is also provided on the optical cable (215), and the heat shrink tube (216) is used to seal the gap in the connector.

12. The connector according to claim 1 or 6, characterized in that: A ceramic ferrule buffer spring (217) is provided on one side of the optical fiber ceramic ferrule (203) close to the first cavity (201f), and the plug middle tube (209) abuts against the ferrule buffer spring (217).

13. The connector according to claim 12, wherein: The end of the plug middle tube (209) close to the optical fiber ceramic ferrule (203) is provided with a first step (209b) extending in the radial direction.

14. The connector according to claim 1, wherein: The plug body (201) is provided with an insertion structure (201j) at one end of the plug core fixing portion (201d); the insertion structure (201j) is formed by integrally extending from the plug body (201e) in a direction away from the first cavity (201f); the optical fiber ceramic ferrule (203) is partially arranged in the insertion structure (201j); the cross section of the insertion structure (201j) is circular, and a space between the insertion structure (201j) and the optical fiber ceramic ferrule (203) is hollow.

15. The connector according to claim 1, wherein: The plug middle tube (209) is connected to the plug body (201) in a non-threaded manner.

16. The connector according to claim 15, wherein: The outer surface of the plug middle tube (209) is in contact with the inner wall of the plug body (201).

17. The connector according to claim 1, wherein: The outer surface of the plug body (201e) is provided with a step structure (201h), and a first sealing ring (201i) is provided between the step structure (201h) and the threaded connection portion (201e).

18. The connector according to claim 1, wherein: The end of the plug body (201) is provided with a sealing ring groove, a locking groove and a positioning structure in sequence along the axial direction.

19. The connector according to claim 18, wherein: The top of the locking groove is higher than the top of the sealing ring groove, and the bottom of the positioning structure is connected with the extension surface of the top of the locking groove.

20. A connector for optical fiber connection, characterized in that: It includes: A main body (201a), wherein the main body (201a) is provided with a cavity (201b); An optical cable (215) is assembled in the main body (201a), and the optical cable (215) extends into the cavity (201b); An insertion portion (201c) is located at one end of the main body (201a), an end of the insertion portion (201c) away from the main body (201a) is provided with an optical fiber ceramic ferrule (203), and a groove for clamping an adapter matching the connector is provided on the insertion portion (201c). A pushing device (206) is provided on the periphery of the insertion portion (201c), and the pushing device (206) is used to push the inner sleeve (106) of the adapter matched with the connector.

21. An adapter for optical fiber connection, characterized in that: It includes: An adapter body (101), wherein at least one end of the adapter body (101) is a tubular docking portion (40), the docking portion (40) is provided with a docking channel (101a), the adapter body (101) is provided with a ferrule receiving seat (42) for accommodating an optical fiber ceramic ferrule (203), and the docking portion (40) is provided with a receiving groove (101b) communicating with the docking channel (101a); A holding body, the holding body being movably received in the receiving groove (101b); an outer sleeve (105) movably sleeved outside the docking portion (40), the outer sleeve (105) having a first state and a second state, when the outer sleeve (105) is in the first state, the outer sleeve (105) abuts against the holding body and allows a portion of the holding body to extend irreversibly into the docking channel (101a), when the outer sleeve (105) is in the second state, a clearance space (101c) is provided between the outer sleeve (105) and the opening of the receiving groove (101b) for the holding body to exit the docking channel (101a); An inner sleeve (106) is movably assembled on the docking portion (40), and the inner sleeve (106) is used to keep the outer sleeve (105) in the first state after being pushed in the insertion direction.

22. The adapter according to claim 21, wherein: The adapter body (101) is provided with an orientation section, a locking section and a sealing section in sequence along the axial direction.

23. The adapter according to claim 22, wherein: The radial dimensions of the orientation section, the locking section and the sealing section decrease in sequence.

24. A quick-plug optical fiber connection assembly, comprising an adapter (1) and a connector (2), characterized in that: The adapter (1) comprises: - an adapter body (101), wherein at least one end of the adapter body (101) is a tubular docking portion (40), the docking portion (40) is provided with a docking channel (101a), the adapter body (101) is provided with a ferrule receiving seat (42) for accommodating an optical fiber ceramic ferrule (203), the ferrule receiving seat (42) is located in the middle of the adapter body (101), and the docking portion (40) is provided with a receiving groove (101b) communicating with the docking channel (101a); - a holding body, the holding body being movably received in the receiving groove (101b); - an outer sleeve (105) movably sleeved outside the docking portion (40), the outer sleeve (105) having a first state and a second state. When the outer sleeve (105) is in the first state, the outer sleeve (105) abuts against the holding body and allows a portion of the holding body to extend irreversibly into the docking channel (101a). When the outer sleeve (105) is in the second state, a clearance space (101c) is provided between the outer sleeve (105) and the opening of the receiving groove (101b) for the holding body to exit the docking channel (101a); - an inner sleeve (106) movably assembled on the docking portion (40), the inner sleeve (106) being used to keep the outer sleeve (105) in the first state after being pushed in the insertion direction; The connector (2) comprises: - a plug body (201) docked with the adapter body (101), the plug body (201) comprising a plug main body (201e) provided with a first cavity (201f), a plug core fixing portion (201d) and a threaded connection portion (201g), the plug core fixing portion (201d) and the threaded connection portion (201g) being respectively located at two ends of the plug main body (201e); A plug middle tube (209), which is disposed in the first cavity (201f), and the plug middle tube (209) is provided with a second cavity (209a); An optical cable (215) comprises an optical fiber (202), wherein the optical fiber (202) is accommodated in the second cavity (209a), and the optical fiber (202) is spaced apart from the inner wall of the second cavity (209a).

25. A quick-plug optical fiber connection assembly, comprising an adapter (1) and a connector (2), characterized in that: The adapter (1) comprises: - an adapter body (101), wherein at least one end of the adapter body (101) is a tubular docking portion (40), the docking portion (40) is provided with a docking channel (101a), the adapter body (101) is provided with a ferrule receiving seat (42) for accommodating an optical fiber ceramic ferrule (203), the ferrule receiving seat (42) is located in the middle of the adapter body (101), and the docking portion (40) is provided with a receiving groove (101b) communicating with the docking channel (101a); - a holding body, the holding body being movably received in the receiving groove (101b); - an outer sleeve (105) movably sleeved outside the docking portion (40), the outer sleeve (105) having a first state and a second state. When the outer sleeve (105) is in the first state, the outer sleeve (105) abuts against the holding body and allows a portion of the holding body to extend irreversibly into the docking channel (101a). When the outer sleeve (105) is in the second state, a clearance space (101c) is provided between the outer sleeve (105) and the opening of the receiving groove (101b) for the holding body to exit the docking channel (101a); - an inner sleeve (106) movably assembled on the docking portion (40), the inner sleeve (106) being used to keep the outer sleeve (105) in the first state after being pushed in the insertion direction; The connector (2) comprises: - a main body (201a), wherein the main body (201a) is provided with a cavity (201b); - an optical cable (215) assembled in the main body (201a), and the optical cable (215) extends into the cavity (201b); - an insertion portion (201c) located at one end of the main body (201a), an optical fiber ceramic ferrule (203) is provided at one end of the insertion portion (201c) away from the main body (201a), and a groove for clamping an adapter matching the connector is provided on the insertion portion (201c), and at the same time, - A pushing device (206) is provided on the periphery of the inserting portion (201c), and the pushing device (206) is used to push the inner sleeve (106) of the adapter matched with the connector; at the same time, When the connector (2) is inserted into the adapter (1), the ejection device (206) abuts against the inner sleeve (106), and the outer sleeve (105) remains in the first state, and part of the clamping body irreversibly extends into the docking channel (101a) and is clamped in the groove.

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