CN109407219B

CN109407219B - Push-pull type multi-core optical fiber connector

Info

Publication number: CN109407219B
Application number: CN201811449039.6A
Authority: CN
Inventors: 温同强; 胡治国; 周晓军; 尚慧娟
Original assignee: China Aviation Optical Electrical Technology Co Ltd
Current assignee: China Aviation Optical Electrical Technology Co Ltd
Priority date: 2018-11-30
Filing date: 2018-11-30
Publication date: 2020-09-18
Anticipated expiration: 2038-11-30
Also published as: CN109407219A

Abstract

A push-pull multi-core optical fiber connector comprises a spline shell, a movable sleeve, a rear sleeve, a crimping sleeve, a sheath and an MT contact pin, wherein the MT contact pin and the rear sleeve are arranged in the spline shell in a pressing mode through a fixing nut, a first elastic piece is clamped between the MT contact pin and the rear sleeve, and the front end of the MT contact pin and the rear end of the rear sleeve respectively protrude out of the spline shell; the movable sleeve is sleeved outside the spline shell, the limiting table abuts against the first boss, the key is placed in the key groove, the second elastic piece is arranged in a cavity formed by the first groove and the key groove, the second elastic piece is clamped between the key and the front end face of the fixing nut, and the fixing nut is rotated to enable the second elastic piece to be stressed in a compression state; the large-diameter end of the crimping sleeve is pressed at the rear end part of the movable sleeve; the sheath is arranged outside the rear sleeve and the crimping sleeve which protrude out of the spline shell, and the inlet of the sheath is tightly attached to the small-diameter end of the crimping sleeve. The invention realizes a push-pull locking mode by designing a movable sleeve structure; the metal shell is adopted, and the tail part and the interior of the connector are sealed by adopting rubber materials, so that the outdoor use requirement is met.

Description

Push-pull type multi-core optical fiber connector

Technical Field

The invention belongs to the technical field of multi-core optical fiber connectors, and particularly relates to a push-pull multi-core optical fiber connector with a novel structure.

Background

Conventional high-density multi-core fiber optic connectors typically employ MT pins as contacts, which are modular pins having dimensions of 2.5 by 6.4, and typically contain 12, 24, up to 48 channels of optical paths. At present, the mature multi-core optical fiber connector products are MPO and GYM optical fiber connectors. Referring to fig. 1A and 1B, the MPO fiber connector meets the requirements of YD/T1272.5 specification, is a non-metal structure, has all injection-molded parts, is low in manufacturing cost, is an indoor fiber connector, is mainly applied to a large data center room, and realizes high-density optical signal interconnection, and has the following disadvantages: the field use is limited. Referring to fig. 2A and 2B, the GYM optical fiber connector adopts a metal shell, an MT contact pin is arranged inside, the threaded connection is firm and reliable, and the requirement of field use can be met, and the drawback is that: the volume is bigger than that of the MPO optical fiber connector, and the small space is difficult to use.

Disclosure of Invention

Aiming at the defects of the existing multi-core optical fiber connector, the invention aims to provide a push-pull type multi-core optical fiber connector which adopts a metal shell and is small in size and can realize the transmission of high-density optical signals.

The purpose of the invention is realized by adopting the following technical scheme. According to the push-pull type multi-core optical fiber connector provided by the invention, the push-pull type multi-core optical fiber connector comprises a spline shell 1, a movable sleeve 2, a rear sleeve 4, a crimping sleeve 5, a sheath 6 and an MT contact pin 7, wherein the outer wall of the spline shell 1 is axially provided with a limiting table 101 and a key groove; the inner wall of the movable sleeve 2 is provided with a first boss 201 along the circumferential direction and a first groove 202 along the axial direction, and the front end part of the first groove 202 is provided with a key 203 along the radial direction;

the MT contact pin 7 is positioned in the spline shell 1 through a step, and the front end of the MT contact pin protrudes out of the spline shell 1; the rear sleeve 4 is pressed in the spline shell 1 through the fixing nut 3, and the rear end of the rear sleeve protrudes out of the spline shell 1; a first elastic piece in a compressed state is clamped between the MT contact pin and the rear sleeve 4;

the movable sleeve 2 is sleeved outside the spline shell 1, and the limiting table 101 abuts against the first boss 201; the key 203 is placed in the key slot, a second elastic piece is arranged in a cavity formed by the first groove 202 and the key slot, meanwhile, the second elastic piece is clamped between the key 203 and the front end face of the fixing nut 3, and the fixing nut 3 is rotated to enable the second elastic piece to be stressed and to be in a compressed state;

the large-diameter end of the crimping sleeve 5 is crimped at the rear end part of the movable sleeve 2; the sheath 6 is arranged outside the rear sleeve 4 and the crimping head 5 which protrude out of the spline shell, and the inlet 601 of the sheath is tightly attached to the small-diameter end of the crimping sleeve 5.

Further, the outer wall of the spline housing 1 is further provided with a protrusion 102 and a third groove 103 located at the rear side of the protrusion, and the third groove 103 is located at the front side of the key slot.

Further, the rear end of the first groove 202 is located on the rear end surface of the movable sleeve 2.

Furthermore, the front end of the spline housing 1 is provided with a dust cap 10 capable of covering the front end of the MT pin 7 through a thread.

Furthermore, a rubber pad 11 is arranged between the second boss 301 of the fixing nut 3 and the rear end face of the spline housing 1 and the third boss 401 of the rear sleeve 4, and the rubber pad 11 is pressed by rotating the fixing nut 3.

Further, a step surface is provided at the front end of the rear cover 4, and the first elastic member in a compressed state is interposed between the MT ferrule 7 and the step surface.

Further, the second boss 301 of the fixing nut 3, the rear sleeve 4 and the large-diameter end of the crimping sleeve 5 form a third groove, and the large-diameter end of the sheath 6 is clamped into the third groove.

Furthermore, the corner of the large-diameter end of the crimping sleeve 5 is provided with a chamfer, so that the large-diameter end of the sheath 6 can be conveniently clamped into the third groove.

Further, the inlet of the sheath 6 is gourd-shaped.

Further, the first elastic piece and the second elastic piece are both springs.

The push-pull type multi-core optical fiber connector has the following advantages:

1. the interface size is consistent with that of the MPO optical fiber connector, the diameter of the maximum excircle is only 12, and the interface size is almost consistent with that of a rectangular MPO (7.8 × 12.5); compared with a GYM optical fiber connector (the diameter of the minimum excircle is 29) which can be used in the field, the volume of the optical fiber connector is reduced by several times, and the same shell can be compatible with 12-path, 24-path and 48-path optical signal transmission;

2. by designing the movable sleeve structure, the connector is inserted and closed in a push-pull locking mode, and compared with a connector locked by threads, the connector has the characteristics of quick and convenient connection, convenient operation and the like;

3. the product adopts metal casing to adopt rubber materials to seal respectively in the afterbody of connector and inside, possess IP 76's waterproof grade requirement, satisfy field operation requirement.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understandable, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

Fig. 1A to 1B are schematic views of a conventional MPO optical fiber connector.

Fig. 2A to 2B are schematic diagrams of a conventional GYM optical fiber connector.

Fig. 3A to 3B are schematic external views of a push-pull multi-core fiber optic connector according to the present invention.

Fig. 4 is a schematic cross-sectional view of a push-pull multi-fiber connector of the present invention.

[ description of main element symbols ]

1: spline housing

101: a limiting table 102: projection 103: third groove

2: movable sleeve

201: first boss 202: first recess 203-key

3: fixing the nut 301: second boss

4: a rear cover 401: third boss

5: crimping sleeve

6: the sheath 601: an inlet

7: MT inserting needle 8: first spring

9: second spring 10: dust-proof cap

11: rubber pad

Detailed Description

The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and preferred embodiments. In this embodiment, the position of the MT pin is defined as "front", and the position of the sheath is defined as "rear".

Referring to fig. 3A and 3B, a push-pull multi-core fiber connector includes a spline housing 1, a movable sleeve 2, a fixing nut 3, a rear sleeve 4, a crimping sleeve 5, and a sheath 6, wherein two limiting tables 101 and two key slots are symmetrically arranged on an outer wall of the spline housing 1 along an axial direction; the inner wall of the movable sleeve 2 is circumferentially provided with an annular first boss 201, the inner wall is axially symmetrically provided with two semicircular first grooves 202, the rear end of each groove 202 is positioned on the rear end face of the movable sleeve 2, and the front end part of each groove is radially and convexly provided with a key 203; the inner wall of the fixed nut 3 is provided with an annular second boss 301; the rear sleeve 4 is provided with a third boss 401.

Referring to fig. 4, the MT insert pin 7 is positioned inside the spline housing 1 by a step, and its front end protrudes out of the spline housing 1. The dust cap 10 is installed at the front end of the spline housing 1 in a threaded manner, and covers the MT contact pin 7, so that dust is prevented from falling on the MT contact pin and affecting transmission of optical signals. When the connector is plugged, the dustproof cap 10 is only required to be taken down;

the rear sleeve 4 is pressed in the spline shell 1 through the fixing nut 3, and the rear end of the rear sleeve protrudes out of the spline shell 1; a first spring 8 in a compressed state is arranged between the MT contact pin 7 and the step surface of the rear sleeve 4, so that the MT contact pin 7 can keep constant pressure by means of the rebound force of the spring, and the reliable contact of the end surfaces of the contact pins when the connector is plugged is further ensured. The fixing nut 3 is in threaded connection with the spline housing 1, a rubber pad 11 is clamped between the second boss 301 of the fixing nut and the rear end face of the spline housing 1 and between the third boss 401 of the rear sleeve 4, and the rubber pad 10 is pressed tightly by rotating the fixing nut 3 during connector assembly, so that good sealing is realized;

the movable sleeve 2 is sleeved outside the spline shell 1, and the keys 203 are placed in the corresponding key grooves to limit the rotational freedom degree of the movable sleeve 2 in the circumferential direction; a cavity formed by the semicircular first groove 202 and the corresponding key groove is internally provided with the second spring 9, and the second spring 9 can only deform under axial stress under the limitation of the upper groove and the lower key groove, so that the circumferential movement is avoided; meanwhile, the second spring 9 is clamped between the key 203 and the front end face of the fixing nut 3, and the second spring 9 is stressed to be in a compressed state by rotating the fixing nut 3 during connector assembling; the limiting table 101 on the outer wall of the spline shell 1 abuts against the first boss 201 on the inner wall of the movable sleeve 1, and the second spring 9 in a compressed state is prevented from pushing the key 203 out of the key groove when the fixing nut is rotated;

the large-diameter end of the crimping sleeve 5 is crimped on the rear end of the rear sleeve 4; the sheath 6 is arranged outside the rear sleeve 4 protruding out of the rear end of the spline shell and the crimping joint 5, and the gourd-shaped inlet 601 of the sheath is tightly attached to the small-diameter end of the crimping sleeve 5. The corner of the large-diameter end of the crimping sleeve is provided with a chamfer, so that the large-diameter end of the sheath 6 is conveniently clamped into a second groove formed by a second boss 301 of the fixing nut, the rear sleeve 4 and the large-diameter end of the crimping sleeve 5 when the sheath 6 is pushed up, and good sealing is realized;

the optical cable connected with the MT contact pin 7 sequentially passes through the inlets of the first spring 8, the rear sleeve 4, the crimping sleeve 5 and the sheath 6. The inlet of the sheath 6 is arranged to be gourd-shaped, so that good sealing, water proofing and moisture proofing can be realized.

As a further improvement of the present invention, the outer wall of the spline housing 1 is further provided with a protrusion 102, a third groove 103 located behind the protrusion 102, the third groove 103 being located at the front side of the key groove and the key 203 provided therein. When the connector is plugged, the end part of the socket shell is pushed onto the protrusion 102, the front end part of the movable sleeve 2 moves backwards along the key groove under the action of the pushing force, the second spring 9 is further compressed, then the end part of the socket shell falls into the third groove 103, the movable sleeve 2 resets under the reaction force of the second spring 9, and the plugging of the connector is completed; the end of the socket housing is pulled out of the third recess 103 upon disconnection of the connector, completing the unlocking of the connector. In summary, the multi-core optical fiber connector provided by the invention completes the plugging or unlocking of the connector in a push-pull locking mode.

As a further improvement of the present invention, two first grooves 202 formed on the inner wall of the movable slot 2 respectively pass through the first bosses 201, and the key 203 is located at the front side of the first bosses 201, so that the first bosses 201 are in a discontinuous ring shape.

As a further improvement of the invention, the sheath 6 is made of rubber materials, has the waterproof grade requirement of IP67, can meet the requirement of field use, and increases the application range of the connector.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention in any way, and any simple modification, equivalent change and modification made by those skilled in the art according to the technical spirit of the present invention are still within the technical scope of the present invention without departing from the technical scope of the present invention.

Claims

1. A push-pull type multi-core optical fiber connector is characterized by comprising a spline shell (1), a movable sleeve (2), a rear sleeve (4), a crimping sleeve (5), a sheath (6) and an MT (MT) inserting needle (7), wherein the outer wall of the spline shell (1) is axially provided with a limiting table (101) and a key groove, and the outer wall is also provided with a protrusion (102) and a third groove (103) positioned on the rear side of the protrusion and the front side of the key groove; a first boss (201) is arranged on the inner wall of the movable sleeve (2) along the circumferential direction, a first groove (202) is arranged along the axial direction, and a key (203) is arranged at the front end part of the first groove (202) along the radial direction;

the MT contact pin (7) is positioned in the spline shell (1) through a step, and the front end of the MT contact pin protrudes out of the spline shell (1); the rear sleeve (4) is pressed in the spline shell (1) through the fixing nut (3), and the rear end of the rear sleeve protrudes out of the spline shell (1); a first elastic piece in a compressed state is clamped between the MT contact pin and the rear sleeve (4);

the movable sleeve (2) is sleeved outside the spline shell (1), and the limiting table (101) is tightly abutted against the first boss (201); the key (203) is placed in the key slot, a second elastic piece is arranged in a cavity formed by the first groove (202) and the key slot, the second elastic piece is clamped between the key (203) and the front end face of the fixing nut (3), and the fixing nut (3) is rotated to enable the second elastic piece to be stressed and to be in a compressed state;

the large-diameter end of the crimping sleeve (5) is crimped at the rear end part of the movable sleeve (2); the sheath (6) is arranged outside the rear sleeve (4) and the crimping sleeve (5) which protrude out of the spline shell, and an inlet (601) of the sheath is tightly attached to the small-diameter end of the crimping sleeve (5).

2. Push-pull multi-core optical fiber connector according to claim 1, characterized in that the rear end of the first groove (202) is located on the rear end face of the moving sleeve (2).

3. The push-pull multi-core fiber optic connector according to claim 1, wherein the front end of the spline housing (1) is threaded with a dust cap (10) that covers the front end of the MT ferrule (7).

4. The push-pull multi-core optical fiber connector according to claim 1, characterized in that a rubber gasket (11) is clamped between the second boss (301) of the fixing nut (3) and the rear end face of the spline housing (1) and the third boss (401) of the rear sleeve (4), and the rubber gasket (11) is pressed by rotating the fixing nut (3).

5. A push-pull type multi-core optical fiber connector according to claim 1, characterized in that the front end of the rear sleeve (4) is provided with a step surface, and the first elastic member in a compressed state is sandwiched between the MT ferrule (7) and the step surface.

6. A push-pull multi-core optical fiber connector according to claim 1, characterized in that the second boss (301) of the fixing nut (3), the rear sleeve (4) and the large diameter end of the crimping sleeve (5) constitute a second groove into which the large diameter end of the sheath (6) is snapped.

7. A push-pull multi-core optical fiber connector according to claim 6, characterized in that the corner of the large diameter end of the crimp sleeve (5) is chamfered to facilitate the snapping of the large diameter end of the sheath (6) into the second groove.

8. Push-pull multi-core fiber optic connector according to claim 1, characterized in that the entry of the jacket (6) is gourd-shaped.

9. A push-pull multi-fiber connector according to any of claims 1-8, wherein the first and second resilient members are springs.