Photoelectric hybrid connector for bidirectional connection

Abstract

The utility model relates to the technical field of optical communication, in particular to a photoelectric hybrid connector for bidirectional connection, which comprises a male end connector and a female end connector. The male end connector comprises a first shell sleeve, a first insertion core assembly and a first power transmission assembly, supporting rods are arranged on the upper surface and the lower surface of the first shell sleeve respectively, and each supporting rod is provided with a first locking opening and a pressing part; the female end connector comprises a second shell sleeve, a second insertion core assembly and a second power transmission assembly, first notches with a first preset distance length are formed in the upper surface and the lower surface of the second shell sleeve in the axial direction, and first lock heads are arranged on the first notches; after the female end connector is connected with the male end connector, the first lock head and the first lock opening are locked. The upper surface and the lower surface of the photoelectric hybrid connector are respectively provided with an interlocking structure of the first lock head and the first lock opening, so that the photoelectric hybrid connector can ensure the connection stability of the male end connector and the female end connector in a vibration environment.

Description

Technical Field

[0001] The utility model relates to the technical field of optical communication, in particular to a photoelectric hybrid connector capable of bidirectional connection. Background Art

[0002] Optical fiber communication is a communication method that uses light waves as information carriers and optical fibers as transmission media. The field of optical communication technology usually involves devices such as connectors, optical modules, and adapters.

[0003] Among them, the connector is an optical passive device that realizes the connection between optical fibers. It has the function of connecting between optical fibers, optical fibers and active devices, optical fibers and equipment, optical fibers and other passive devices, and optical fibers and instruments. As a very important optical signal interface device in optical fiber communication, the optical module has an optical interface and an electrical interface. The optical interface is connected to the optical fiber to transmit optical signals, and the electrical interface is connected to the external communication terminal equipment. The adapter is used to transfer two connectors. Especially in the optical fiber equipment represented by 5G base stations and FTTR equipment, there are a large number of plug-in optoelectronic lines in the scenario where remote power supply is required while communicating at a wide bandwidth. Due to the separate settings of optoelectronics, there are many connectors and they are divided into two categories, optoelectronics, which need to be correctly paired one by one, resulting in cumbersome operations during installation and maintenance, and prone to plug-in errors.

[0004] On the other hand, at the terminal end of the FTTH network, the traditional copper wire transmits network signals and supplies power to the terminal end at the same time. As the FTTH optical network develops into the FTTR optical network, for example, the vehicle-mounted terminal needs to meet the needs of autonomous driving and artificial intelligence interaction, and the terminal end has higher and higher bandwidth requirements. The traditional copper wire signal transmission capacity can no longer meet the terminal end bandwidth requirements; the terminal end signal transmission medium of the FTTR network is copper out and light in, and the power supply of the terminal end is provided by the cable, which is already a general trend; in order to connect these composite cables, one solution of the prior art is that the optical connector and the electrical connector are designed independently, and the optical connector and the optical adapter are plugged and coupled to realize the optical signal docking; the electrical connector and the electrical adapter are plugged and coupled to realize the electrical signal coupling docking. However, using separate optical connectors and electrical connectors requires plugging and unplugging twice to complete the connection with the adapter.

[0005] The above problems are particularly prominent in terminal scenarios with remote power supply 5G signal coverage and in-vehicle application scenarios with strict requirements for shockproofing; in view of this, overcoming the defects of the existing technology is an urgent problem to be solved in this technical field. Utility Model Content

[0006] The utility model aims to overcome the problem that the photoelectric hybrid connector is in an unstable connection state due to vibration in a vehicle-like environment.

[0007] The utility model is achieved in this way:

[0008] The utility model provides a photoelectric hybrid connector capable of bidirectional connection, comprising: a male connector 1 and a female connector 2; the male connector 1 and the female connector 2 are coupled via an interlocking structure;

[0009] The male end connector 1 comprises a first outer shell 10, a first plug assembly 11 and a first power transmission assembly 12. The upper and lower surfaces of the first outer shell 10 are respectively provided with a support rod 100. The support rod 100 is provided with a first locking opening 1000 and a pressing portion 1001. The first locking opening 1000 and the pressing portion 1001 are relatively located on two sides of the support rod 100.

[0010] The female connector 2 comprises a second outer shell 20, a second plug assembly 21 and a second power transmission assembly 22. The second outer shell 20 is located on the upper and lower surfaces of the second outer shell 20 near the end where the female connector 2 and the male connector 1 are connected, and a first notch 200 with a first preset length is arranged in the axial direction. A first lock 2000 is arranged on the first notch 200. When the female connector 2 and the male connector 1 are connected, the first lock 2000 and the first lock 1000 are locked to form an interlocking structure. The first notch 200 accommodates part of the crossbar located above the male connector 1.

[0011] After the male connector 1 and the female connector 2 are connected, the first ferrule assembly 11 and the second ferrule assembly 21 are coupled, and the first power transmission assembly 12 and the second power transmission assembly 22 are coupled.

[0012] Preferably, the first power transmission component 12 includes a male end conductive terminal 13, and the second power transmission component 22 includes a female end conductive terminal 220, and the male end conductive terminal 13 and the female end conductive terminal 220 are abutted to achieve electrical connection between the male end connector 1 and the female end connector 2.

[0013] Preferably, the second power transmission component 22 further comprises a columnar body 221 docked with the second plug assembly 21, and a positioning member 222 fixed on the columnar body 221, wherein the positioning member 222 is used to embed the female conductive terminal 220;

[0014] The structure on the positioning member 222 for embedding the female conductive terminal 220 includes a rectangular groove 2220 arranged on the positioning member 222 , and a section of the corresponding rectangular groove 2220 away from the fork head is made with a skylight 2221 , and the skylight 2221 is used to provide a welding area for the wire 3 and the female conductive terminal 220 .

[0015] Preferably, the abutment of the female conductive terminal 220 is located on the inner side and the outer side of the abutment of the male conductive terminal 13 respectively.

[0016] Preferably, four accommodating cavities 101 are formed on the inner sides of four corners of the male connector 1 adjacent to the first outer shell 10 ; the accommodating cavities 101 are used to be vacant or to embed the male conductive terminals 13 .

[0017] Preferably, the male end conductive terminal 13 is specifically a door-type electrical terminal, which is composed of an insulating door beam 130 and two door columns 131 respectively fixed on the insulating door beam 130 and electrically isolated from each other; wherein the two door columns 131 each include a welding area, and the welding area is arranged on the insulating door beam 130 in a staggered manner.

[0018] Preferably, the door-type electrical terminal is limited on the rectangular boss 140 of the central axis assembly 14 of the male end connector 1; after the central axis assembly 14 and the first outer shell 10 are locked with each other, the door-type electrical terminal protrudes from the door column 131 of the end face of the central axis assembly 14 and is embedded in the accommodating cavity 101 set on the corner of the first outer shell 10.

[0019] Preferably, a clamping plate 1002 is provided at the bottom of the support rod 100 , and a corresponding clamping groove 102 is provided on the first outer shell 10 , and the clamping plate 1002 is coupled with the clamping groove 102 .

[0020] Preferably, the number of the clamping plates 1002 is at least one, and each of the clamping plates 1002 is provided with a through hole 1003, the through hole 1003 is an elliptical or rectangular shape, and the through hole 1003 passes through two opposite side surfaces of the clamping plate 1002;

[0021] The maximum height of the clamping plate 1002 is greater than the height of the clamping slot 102 , and a preset difference is set between the maximum height of the clamping plate 1002 and the height of the clamping slot 102 .

[0022] Preferably, fool-proofing protrusions 103 are respectively provided on both sides of the first outer shell 10 , and fool-proofing grooves 201 corresponding to the fool-proofing protrusions 103 are provided on the inner side of the second outer shell 20 .

[0023] Compared with the prior art, the beneficial effect of the present invention is that by arranging the interlocking structure of the first lock head 2000 and the first lock port 1000 on the upper and lower surfaces of the optoelectronic hybrid connector, the optoelectronic hybrid connector can ensure the stability of the connection between the male connector 1 and the female connector 2 even in an environment with vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the overall structure of a bidirectional optoelectronic hybrid connector provided by an embodiment of the utility model;

[0026] Figure 2 A photoelectric hybrid connector for bidirectional connection provided by the embodiment of the utility model Figure 1 A cross-sectional view of

[0027] Figure 3 A schematic diagram of a foolproof protrusion of a photoelectric hybrid connector for bidirectional connection provided by an embodiment of the utility model;

[0028] Figure 4 A schematic diagram of a foolproof groove of a photoelectric hybrid connector for bidirectional connection provided by an embodiment of the utility model;

[0029] Figure 5 A schematic diagram of a male conductive terminal and a female conductive terminal of a bidirectionally connected optoelectronic hybrid connector provided by an embodiment of the utility model;

[0030] Figure 6 A schematic diagram of a positioning member of a photoelectric hybrid connector capable of bidirectional connection provided by an embodiment of the utility model;

[0031] Figure 7 A schematic diagram of a male conductive terminal of a photoelectric hybrid connector capable of bidirectional connection provided by an embodiment of the utility model;

[0032] Figure 8 A schematic diagram of a receiving slot of a photoelectric hybrid connector for bidirectional connection provided by an embodiment of the utility model;

[0033] Fig. 9 A schematic diagram of the male conductive terminal of a bidirectionally connected optoelectronic hybrid connector provided by an embodiment of the utility model;

[0034] Fig.10 A schematic diagram of the installation of a male conductive terminal of a photoelectric hybrid connector capable of bidirectional connection provided by an embodiment of the utility model;

[0035] Fig.11A schematic diagram of a gate-shaped male conductive terminal of a photoelectric hybrid connector capable of bidirectional connection provided by an embodiment of the utility model;

[0036] Fig.12 A schematic diagram of a support rod of a photoelectric hybrid connector capable of bidirectional connection provided by an embodiment of the utility model;

[0037] Fig.13 A schematic diagram of a support rod with a snap-in plate of an optoelectronic hybrid connector capable of bidirectional connection provided by an embodiment of the utility model;

[0038] Fig.14 A schematic diagram of a card slot of a photoelectric hybrid connector for bidirectional connection provided by an embodiment of the utility model;

[0039] Fig.15 A schematic diagram of a photoelectric hybrid connector card board capable of bidirectional connection provided by an embodiment of the utility model.

[0040] Wherein, the accompanying drawings are marked as follows:

[0041] 1-male connector, 10-first outer shell, 100-support rod, 1000-first lock, 1001-pressing part, 1002-clip plate, 1003-through hole, 101-accommodating cavity, 102-clip groove, 103-anti-fool protrusion, 11-first plug assembly, 12-first power transmission assembly, 13-male conductive terminal, 130-insulating door beam, 131-door column, 14-central axis assembly, 140-rectangular boss, 2-female connector, 20-second outer shell, 200-first slot, 2000-first lock, 201-anti-fool groove, 21-second plug assembly, 22-second power transmission assembly, 220-female conductive terminal, 221-columnar body, 222-positioning piece, 2220-rectangular groove, 2221-skylight, 3-wire. DETAILED DESCRIPTION

[0042] In the description of the present invention, the terms "inside", "outside", "longitudinal", "lateral", "upper", "lower", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0043] The terms "first", "second", etc. in this utility model are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of this utility model, unless otherwise specified, "plurality" means two or more.

[0044] In the present invention, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. In addition, the term "coupling" can be a way of achieving electrical connection for signal transmission.

[0045] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0046] The utility model provides a photoelectric hybrid connector capable of bidirectional connection. Figure 1-Figure 2 As shown, it includes: a male end connector 1 and a female end connector 2; the male end connector 1 and the female end connector 2 are coupled through an interlocking structure.

[0047] The male end connector 1 includes a first outer shell 10, a first plug assembly 11 and a first power transmission assembly 12. The upper and lower surfaces of the first outer shell 10 are respectively provided with a support rod 100. The support rod 100 is provided with a first locking port 1000 and a pressing portion 1001. The first locking port 1000 and the pressing portion 1001 are relatively located on both sides of the support rod 100.

[0048] The female end connector 2 includes a second outer shell 20, a second plug assembly 21 and a second power transmission assembly 22. The second outer shell 20 is located on the upper and lower surfaces of the second outer shell 20 near the connecting end of the female end connector 2 and the male end connector 1, and is axially provided with first notches 200 with a first preset length. The first notch 200 is provided with a first lock 2000. When the female end connector 2 is connected to the male end connector 1, the first lock 2000 and the first lock 1000 are locked to form an interlocking structure. The first notch 200 accommodates part of the cross bar located above the male end connector 1.

[0049] After the male connector 1 and the female connector 2 are connected, the first ferrule assembly 11 and the second ferrule assembly 21 are coupled, and the first power transmission assembly 12 and the second power transmission assembly 22 are coupled. Specifically, the first ferrule assembly 11 and the second ferrule assembly 21 are coupled to realize the transmission of optical signals between the male connector 1 and the female connector 2; the first power transmission assembly 12 and the second power transmission assembly 22 are coupled to realize the transmission of electrical signals between the male connector 1 and the female connector 2.

[0050] In order to realize that the male connector 1 and the female connector 2 can each have multiple specifications, and to ensure that only specifications that are compatible with each other can be connected, the connection cannot be completed if the specifications are inconsistent. Figure 3 and Figure 4 As shown, foolproof protrusions 103 are respectively provided on both sides of the first outer shell 10, and foolproof grooves 201 corresponding to the foolproof protrusions 103 are provided on the inner side of the second outer shell 20. When there are male connectors 1 and female connectors 2 of various specifications, the positions and quantities of the corresponding foolproof protrusions 103 and foolproof grooves 201 can ensure that male connectors 1 and female connectors 2 of different specifications cannot be connected.

[0051] By providing the interlocking structure of the first lock head 2000 and the first lock opening 1000 on both the upper and lower surfaces of the optoelectronic hybrid connector, the optoelectronic hybrid connector can ensure the stability of the connection between the male connector 1 and the female connector 2 even in a vibrating environment.

[0052] In order to fully illustrate the complete solution provided by the embodiment of the utility model, the above-mentioned structures of the optoelectronic hybrid connector are further described in detail below.

[0053] The first power transmission component 12 and the second power transmission component 22 are coupled to realize the transmission of electrical signals, and the specific method thereof can be as follows: Figure 5 As shown, the first power transmission component 12 includes a male conductive terminal 13, and the second power transmission component 22 includes a female conductive terminal 220. The male conductive terminal 13 and the female conductive terminal 220 abut against each other to achieve electrical connection between the male connector 1 and the female connector 2. In one embodiment, the abutment of the female conductive terminal 220 is located on the inner side and the outer side of the abutment of the male conductive terminal 13, respectively.

[0054] In order to facilitate the fixing of the female conductive terminal 220, as shown in FIG. Figure 6As shown, the second power transmission component 22 also includes a columnar body 221 docked with the second plug assembly 21, and a positioning piece 222 fixed on the columnar body 221, and the positioning piece 222 is used to embed the female end conductive terminal 220; the structure on the positioning piece 222 for embedding the female end conductive terminal 220 includes a rectangular groove 2220 arranged on the positioning piece 222, and a section of the corresponding rectangular groove 2220 away from the fork head is made with a skylight 2221, and the skylight 2221 is used to provide a welding area between the wire 3 and the second electrical terminal.

[0055] In the embodiment of the utility model, in order to achieve the stability of the male conductive terminal 13 after installation, it is preferred that Figure 7 and Figure 8 As shown, the male conductive terminal 13 is a strip-shaped electrical terminal. Accordingly, four accommodating cavities 101 are formed on the inner sides of the four corners of the male connector 1 adjacent to the first outer shell 10. The accommodating cavities 101 are used to be empty or to embed the male conductive terminal 13. Fig. 9 As shown, the strip-shaped electrical terminal is one of a rectangular strip, a cylindrical strip, a triangular strip, and an elliptical strip.

[0056] like Fig.10 As shown, in addition to the use of a strip-shaped male-end conductive terminal 13, the utility model also provides a more optimal optional method, in which the male-end conductive terminal 13 is specifically a door-type electrical terminal, and the door-type electrical terminal is limited on the rectangular boss 140 of the central axis component 14 of the male-end connector 1; after the central axis component 14 and the first outer shell 10 are mutually locked, the door-type electrical terminal protrudes from the door column 131 on the end face of the central axis component 14 and is embedded in the accommodating cavity 101 set on the corner of the first outer shell 10.

[0057] In order to achieve the technical characteristics of a gate-type electrical terminal having two motors, that is, to achieve the same effect as the above-mentioned strip-shaped male conductive terminal 13, the utility model also provides a matching solution for improving the gate-type electrical terminal, such as Fig.11 As shown, the door-type electrical terminal is composed of an insulating door beam 130 and two door columns 131 respectively fixed on the insulating door beam 130 and electrically isolated from each other; wherein, the two door columns 131 each include a welding area, and the welding area is arranged on the insulating door beam 130 in a staggered manner.

[0058] For the support rod 100 disposed on the first outer shell 10, the support rod 100 may be as follows: Fig.12As shown, it is fixedly connected to the first outer shell 10, but in actual application scenarios, after long-term use, the support rod 100 is frequently moved left and right, and fatigue fracture is very likely to occur at the connection between the support rod 100 and the first outer shell 10. If it needs to be repaired, the entire first outer shell 10 can only be replaced, which is not conducive to subsequent maintenance. Therefore, in a preferred solution, the support rod 100 is separated from the first outer shell 10, specifically including, Fig.13 and Fig.14 As shown, a clamping plate 1002 is provided at the bottom of the support rod 100, and a corresponding clamping groove 102 is provided at the first outer shell 10, and the clamping plate 1002 is coupled with the clamping groove 102. The clamping groove 102 is extended from the side surface of the first outer shell 10 to the inside of the first outer shell 10, and the clamping groove 102 is symmetrically arranged on the upper surface and the lower surface of the first outer shell 10.

[0059] like Fig.15 As shown, the number of the clamping plates 1002 is at least one, and each of the clamping plates 1002 is provided with a through hole 1003, and the through hole 1003 is one of an ellipse or a rectangle, and the through hole 1003 runs through two opposite side surfaces of the clamping plate 1002. In a preferred solution, considering the stability of the coupling between the clamping plate 1002 and the clamping slot 102, the maximum height of the clamping plate 1002 is greater than the height of the clamping slot 102, and a preset difference is set between the maximum height of the clamping plate 1002 and the height of the clamping slot 102. So that the clamping plate 1002 and the clamping slot 102 can achieve interference fit, and when the clamping plate 1002 is clamped in the clamping slot 102, due to the through hole 1003 provided on the clamping plate 1002, the clamping slot 102 squeezes the clamping plate 1002, so that the clamping plate 1002 is firmly clamped in the clamping slot 102.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An optoelectronic hybrid connector capable of bidirectional connection, characterized in that: include: A male connector (1) and a female connector (2); The male end connector (1) and the female end connector (2) are coupled via an interlocking structure; The male end connector (1) comprises a first outer shell (10), a first plug assembly (11) and a first power transmission assembly (12); the upper and lower surfaces of the first outer shell (10) are respectively provided with a support rod (100); the support rod (100) is provided with a first locking opening (1000) and a pressing portion (1001); the first locking opening (1000) and the pressing portion (1001) are relatively located on two sides of the support rod (100); The female connector (2) comprises a second outer shell (20), a second plug assembly (21) and a second power transmission assembly (22); the second outer shell (20) is located on the upper and lower surfaces of the second outer shell (20) near the end where the female connector (2) and the male connector (1) are connected, and is provided with first notches (200) of a first preset length in the axial direction; a first locking head (2000) is provided on the first notch (200); when the female connector (2) and the male connector (1) are connected, the first locking head (2000) and the first locking mouth (1000) are locked to form an interlocking structure; the first notch (200) accommodates part of the crossbar located above the male connector (1); After the male end connector (1) and the female end connector (2) are connected, the first ferrule assembly (11) and the second ferrule assembly (21) are coupled, and the first power transmission assembly (12) and the second power transmission assembly (22) are coupled.

2. The optoelectronic hybrid connector capable of bidirectional connection according to claim 1, characterized in that: The first power transmission component (12) comprises a male end conductive terminal (13), and the second power transmission component (22) comprises a female end conductive terminal (220), wherein the male end conductive terminal (13) and the female end conductive terminal (220) are in abutment with each other to realize electrical connection between the male end connector (1) and the female end connector (2).

3. The optoelectronic hybrid connector capable of bidirectional connection according to claim 2, characterized in that: The second power transmission component (22) further comprises a columnar body (221) docked with the second plug-in component (21), and a positioning member (222) fixed on the columnar body (221), wherein the positioning member (222) is used to embed the female conductive terminal (220); The structure on the positioning member (222) for embedding the female end conductive terminal (220) comprises a rectangular groove (2220) arranged on the positioning member (222), and a section of the corresponding rectangular groove (2220) away from the fork head is provided with a skylight (2221), and the skylight (2221) is used to provide a welding area for the wire (3) and the female end conductive terminal (220).

4. The optoelectronic hybrid connector capable of bidirectional connection according to claim 2, characterized in that: The abutment joint of the female end conductive terminal (220) is located on the inner side and the outer side of the abutment joint of the male end conductive terminal (13) respectively.

5. The optoelectronic hybrid connector capable of bidirectional connection according to claim 1, characterized in that: Four accommodating cavities (101) are formed on the inner sides of four corners of the male end connector (1) adjacent to the first outer shell (10); the accommodating cavities (101) are used to be empty or to be used to embed male end conductive terminals (13).

6. The optoelectronic hybrid connector capable of bidirectional connection according to claim 5, characterized in that: The male end conductive terminal (13) is specifically a door-type electrical terminal, which is composed of an insulating door beam (130) and two door columns (131) respectively fixed on the insulating door beam (130) and electrically isolated from each other; wherein the two door columns (131) each include a welding area, and the welding area is arranged on the insulating door beam (130) in a staggered manner.

7. The optoelectronic hybrid connector capable of bidirectional connection according to claim 6, characterized in that: The door-shaped electrical terminal is limited on the rectangular boss (140) of the central axis component (14) of the male end connector (1); after the central axis component (14) and the first outer shell (10) are locked with each other, the door-shaped electrical terminal protrudes from the door column (131) of the end face of the central axis component (14) and is embedded in the accommodating cavity (101) arranged on the corner of the first outer shell (10).

8. The optoelectronic hybrid connector capable of bidirectional connection according to claim 1, characterized in that: The bottom of the support rod (100) is provided with a clamping plate (1002), the first outer shell (10) is provided with a corresponding clamping groove (102), and the clamping plate (1002) is coupled with the clamping groove (102).

9. The optoelectronic hybrid connector capable of bidirectional connection according to claim 8, characterized in that: The number of the clamping plates (1002) is at least one, each of the clamping plates (1002) is provided with a through hole (1003), the through hole (1003) is one of an elliptical shape and a rectangular shape, and the through hole (1003) passes through two opposite side surfaces of the clamping plate (1002); The maximum height of the clamping plate (1002) is greater than the height of the clamping slot (102), and a preset difference is set between the maximum height of the clamping plate (1002) and the height of the clamping slot (102).

10. The optoelectronic hybrid connector capable of bidirectional connection according to any one of claims 1 to 9, characterized in that: Anti-fool-proofing protrusions (103) are respectively arranged on both sides of the first outer shell (10), and anti-fool-proofing grooves (201) corresponding to the anti-fool-proofing protrusions (103) are arranged on the inner side of the second outer shell (20).

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