TWI761142B - Reverse connector - Google Patents

Abstract

A reverse connector includes a plug and a socket. The plug includes a plug case and a plug terminal configured in the plug case. The socket is connected to the plug and includes a case, a socket terminal set and a screw nut. The case has a containing space and an opening communicated with the containing space. The opening is configured for receiving the plug. The socket terminal set is disposed in the containing space and configured to be connected to the plug terminal. The screw nut is configured on the case and includes a guiding structure. The screw nut is located in the containing space. When the plug is inserted to the socket, the plug case contacts to the screw nut, and the guiding structure of the screw nut lifts up the plug case to prevent the plug case and the screw nut from interfering with each other.

Description

reverse connector

The present invention relates to a connector, and in particular, to a reverse connector that prevents the plug and socket from interfering with each other.

Connectors refer to connecting components and accessories used for electronic signals. Signals are converted and transmitted between electronic devices through cables and connectors. In other words, connectors are also bridges between signals. Connectors are widely used in automotive and computer peripheral applications, communication data applications, industry, military aerospace, transportation, consumer electronics, medical, instruments, commercial equipment, etc., so they play an important role in a variety of fields.

The connector usually includes a plug and a socket matching the plug, and the plug and the socket are connected to each other to realize the electrical connection of the electronic product. Generally, the socket is first disposed on the circuit board and located above the circuit board, and then the plug is inserted into the socket for electrical connection. As shown in FIG. 1 , FIG. 2A and FIG. 2B , in the conventional connector 9 , the bottom of the socket 92 includes a nut 925 to be fixed on the circuit board by screws, and the bottom of the plug housing 911 connecting the socket 92 has a depression Structure 915. Therefore, when the plug 91 is connected to the socket 92 , the recessed structure 915 of the plug 91 can prevent the plug housing 911 from interfering with the nut 925 of the socket 92 . In addition, the bottom of the socket 92 includes a protruding structure 927 and the bottom of the plug housing 911 has a hole 917 corresponding to the protruding structure 927, as a foolproof mechanism for the connector. Therefore, when the plug 91 is connected to the socket 92, the protruding structure 927 of the socket 92 The hole 917 of the plug 91 can be inserted to ensure the connection between the plug 91 and the socket 92 .

With the trend of miniaturization and diversification of functions of electronic devices, the number of electronic components provided on the main circuit board of the electronic device is increasing, and the space for arranging and assembling the electronic components is also getting smaller and smaller. When too many electronic components are arranged above the circuit board and the installation space is insufficient, the socket of the connector may need to be arranged below the circuit board to save space. However, when the socket of the connector is disposed directly under the circuit board, the nut and the protruding structure of the socket are located on the top of the socket. Therefore, the plugs must be inserted into the receptacles backwards to avoid mutual interference, thereby reducing installation convenience. Further, if the plug cannot be turned to be inserted into the socket, since the top of the plug does not include a concave structure and a hole, when the plug is inserted into the socket, the plug may interfere with the nut and the protruding structure and cannot be inserted into the socket smoothly, thereby reducing the convenience. performance and increase assembly time.

Therefore, it is necessary to develop a new type of connector to solve the problems of the prior art.

In view of this, the present invention provides a reverse connector to solve the problems of the prior art.

According to an embodiment of the present invention, the reverse connector includes a plug and a socket. The plug includes a plug housing and plug terminals. The plug terminal is arranged in the plug housing. The socket is used to connect the plug, and further includes a housing, a socket terminal and a nut. The housing has an accommodating space and an opening communicating with the accommodating space. The opening is used to receive the plug. The socket terminal is arranged in the accommodating space. The socket terminal is used to electrically connect the plug terminal of the plug. The nut is provided on the housing and includes a guide structure. The nut is located in the accommodating space. Among them, in the process of inserting the plug into the socket, the plug The head housing contacts the nut, and the guide structure of the nut guides the plug housing to lift up, so as to prevent the plug housing and the nut from interfering with each other.

Wherein, the shape of the guiding structure is selected from one of trapezoid and circular arc.

Wherein, the housing of the socket further includes a fixing hole and a fixing structure arranged around the fixing hole. The position of the fixing hole corresponds to the position of the nut, and the fixing structure is used to fix the nut at the fixing hole.

Further, the socket is fixed on the base plate through a screw passing through a through hole of the base plate and a fixing hole of the casing and being locked to a nut.

Wherein, the socket terminal includes a plurality of socket terminals. Each socket terminal includes a contact portion, a bent portion and a fixed portion, and the bent portion is connected to the contact portion and the fixed portion. The contact parts are used for connecting the plug terminals of the plug, and the fixing parts of the socket terminals are fixed on the substrate.

The socket terminal includes a first socket terminal and a second socket terminal. The first socket terminal and the second socket terminal are arranged opposite to each other and form a groove. When the plug is connected to the socket, the plug terminal is inserted into the groove and contacts the first socket terminal and the second socket terminal.

Further, the plug includes a plug circuit board, and the plug terminals are disposed on the plug circuit board. When the plug is connected to the socket, the plug circuit board is inserted into the groove.

Wherein, the plug includes a locking attachment member disposed on the plug housing, and the housing of the socket includes a locking hole. When the plug is connected to the socket, the locking fastener is fastened to the locking hole.

The socket includes a socket body. The socket body is arranged in the accommodating space, and the socket terminal is arranged in the socket body. When the plug is connected to the socket, the guide structure of the nut guides the plug housing to lift up, so that the plug housing is sleeved on one end of the socket body.

The position of the plug terminal corresponds to the position of the socket terminal.

Wherein, the shell of the socket includes a first side edge, a second side edge and a protruding structure, and the plug shell includes a hole. The first side and the second side are opposite to each other. The nut is arranged on the first side and the protruding structure is arranged on the second side. When the plug is connected to the socket, the protruding structure is embedded in the hole.

To sum up, the reverse connector of the present invention can prevent the interference between the socket and the plug through the guiding structure of the nut of the socket, so as to improve the assembly efficiency. In addition, in the reverse connector of the present invention, the plug housing of the plug can also be restricted between the nut and the socket body by the nut, so that the plug is not easy to swing, thereby improving the stability. In addition, the reverse connector of the present invention can enable the plug to be inserted into the socket without turning, and can also ensure the connection between the plug and the socket through the protruding structure of the socket and the hole of the plug, which not only improves the convenience, but also ensures the connection between the plug and the socket. Assembly man-hours can be reduced.

1: reverse connector

11, 91: plug

111, 911: Plug housing

1111: Body part

1112: Insertion

1117, 917: Holes

113: Plug circuit board

114: Plug terminal

115: Locking fasteners

12, 92: socket

121: Shell

1211: accommodating space

1212: Opening

1213:Fixing hole

1214: Fixed Structure

1215: Locking hole

1216: pin opening

1217, 927: Prominent structure

1218: First side

1219: Second side

122: Socket body

1221: Connector

123: socket terminal

123A: The first socket terminal

123B: Second socket terminal

1231: Contact Department

1232: Bending part

1233: Fixed part

1235: Groove

125, 925: Nut

1251: Bootstrap structure

5: Substrate

7: Screws

9: Connector

915: Recessed Structure

FIG. 1 is an assembled view of a prior art connector.

FIG. 2A is a schematic diagram illustrating the plug of the connector of FIG. 1 from another perspective.

FIG. 2B is a schematic view of the socket of the connector of FIG. 1 from another perspective.

FIG. 3 is an assembled view of a reverse connector according to an embodiment of the present invention.

FIG. 4 is an exploded view showing the plug and socket of the reverse connector according to FIG. 3 .

FIG. 5 is an assembled view of the reverse connector according to FIG. 3 disposed on a substrate.

FIG. 6A is a schematic view of the plug of the reverse connector according to FIG. 5 from another perspective.

FIG. 6B is an exploded view showing the socket and substrate of the reverse connector according to FIG. 5 .

FIG. 7A is a schematic cross-sectional view of the structure of a plug inserted into a socket of a reverse connector according to an embodiment of the present invention.

FIG. 7B is a schematic cross-sectional view of the structure of the reverse connector of FIG. 7A after the plug is inserted into the socket.

In order for the advantages, spirit and features of the present invention to be more easily and clearly understood, detailed descriptions and discussions will follow with reference to the accompanying drawings by way of specific embodiments. It should be noted that these specific embodiments are only representative specific embodiments of the present invention, and the specific methods, devices, conditions, materials, etc. exemplified therein are not intended to limit the present invention or the corresponding specific embodiments. In addition, each device in the figure is only used to express its relative position and is not drawn according to its actual scale, and will be described together first.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal, lateral, upper, lower, front, rear, left, right, top, bottom, inner, outer" etc. is based on the drawings. The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, rather than indicating that the described device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the indefinite articles "a", "an" and "an" before a device or element in the present creation have no limitation on the quantity requirement (ie the number of occurrences) of the device or element. Thus "a" should be read to include one or at least one, and a device or element in the singular also includes the plural unless the number clearly refers to the singular.

Please refer to Figure 3 and Figure 4. FIG. 3 is an assembled view of the reverse connector 1 according to an embodiment of the present invention. FIG. 4 is an exploded view of the plug 11 and the socket 12 of the reverse connector 1 according to FIG. 3 . In this specific embodiment, the reverse connector 1 includes a plug 11 and a socket 12 . The plug includes a plug housing 111 and plug terminals 114 , and the plug terminals 114 are disposed in the plug housing 111 . The socket 12 is used to connect the plug 11 , and the socket 12 further includes a housing 121 and a socket terminal 123 . The housing 121 has an accommodating space 1211 and an opening 1212 communicating with the accommodating space 1211 . The opening 1212 is used to receive the plug 11 . The socket terminal 123 is disposed in the accommodating space 1211 and used to connect to the plug terminal 114 of the plug 11 .

In practice, as shown in FIG. 4 , the plug housing 111 may include a body portion 1111 and an insertion portion 1112 extending from the body portion 1111 . The plug housing 111 forms a cavity. The main body part 1111 and the insertion part 1112 have openings facing each other, and the openings of the main body part 1111 and the insertion part 1112 communicate with the cavity. The plug terminal 114 is disposed in the cavity and located at the insertion portion 1112 of the plug housing 111 . The socket 12 further includes a socket body 122 disposed in the accommodating space 1211 of the housing 121 . The socket body 122 has an opening 1212 of the connecting portion 1221 facing the housing 121 . The socket terminal 123 is disposed on the connecting portion 1221 of the socket body 122 . When the plug 11 is connected to the socket 12 , the insertion portion 1112 of the plug 11 passes through the opening 1212 of the housing 121 of the socket 12 and is sleeved on the connecting portion 1221 of the socket body 122 . Further, the positions of the plug terminals 114 of the plug 11 correspond to the positions of the socket terminals 123 of the socket 12 , and the size and quantity of the plug terminals 114 of the plug 11 may correspond to the size and quantity of the socket terminals 123 of the socket 12 . When the plug 11 is connected to the socket 12 , the plug terminals 114 at the insertion portion 1112 of the plug 11 contact the socket terminals 123 at the connection portion 1221 of the socket body 122 for electrical connection.

In the present embodiment, the plug 11 further includes a plug circuit board 113 , and the plug terminals 114 are disposed on the plug circuit board 113 . The socket terminals 123 may include a first socket terminal 123A and a second socket terminal 123B. The first socket terminal 123A and the second socket terminal 123B are disposed opposite to each other and form a groove 1235 . In practice, the plug terminals 114 may be solder pads disposed on both sides of the plug circuit board 113 , and the socket terminals 123 may be double-row terminals. Further, the socket terminal 123 includes a contact portion 1231 , and the contact portion 1231 of the socket terminal 123 is disposed on the connection portion 1221 of the socket body 122 . The contact portion 1231 of the socket terminal 123 may have a curved elastic structure. When the plug 11 is connected to the socket 12, the plug circuit board 113 of the plug 11 is inserted into the groove 1235 and opens the contact portions 1231 of the first socket terminal 123A and the second socket terminal 123B, and then the first socket terminal 123A and the second socket The contact portion 1231 of the terminal 123B rests against the solder pad on the plug circuit board 113 by the restoring force generated by being opened by the plug circuit board 113 , so that the plug terminal 114 and the socket terminal 123 are electrically connected.

In practice, the types of the plug terminals and the socket terminals and their connection methods are not limited thereto, and the plug terminals and the socket terminals can also be butted terminals. The receptacle may contain a single row of receptacle terminals, and the plug may also contain a single row of plug terminals. When the plug is connected to the socket, the insertion end of the plug is sleeved on the connection end of the socket, and the plug terminals of the plug are respectively inserted into the socket terminals of the socket for electrical connection. In addition, in this embodiment, the plug 11 includes two sets of plug terminals 114, and the socket 12 includes two sets of socket terminals 123, but in practice it is not limited to this, and the plug terminals and the socket terminals may also be one or more sets.

Please refer to Figure 3 to Figure 6. FIG. 5 is an assembled view of the reverse connector 1 according to FIG. 3 disposed on the substrate 5 . FIG. 6A is a schematic view of the plug of the reverse connector according to FIG. 5 from another perspective. FIG. 6B is an exploded view showing the socket 12 and the substrate 5 of the reverse connector 1 according to FIG. 5 . In this specific embodiment, the socket 12 further includes a nut 125 disposed in the accommodating space 1211 of the casing 121 , and the casing 121 of the socket 12 further includes a fixing hole 1213 and a fixing structure 1214 . The fixing structure 1214 is disposed around the fixing hole 1213 and used to fix the nut 125 at the fixing hole 1213 . As shown in FIG. 3 and FIG. 6B , the fixing structure 1214 can be a multi-claw structure extending outward from the surrounding of the fixing hole 1213 , and the nut 125 is fixed at the fixing hole 1213 by means of a clip. However, it is not limited to this in practice, and the nut 125 can also be fixed at the fixing hole 1213 by crimping, riveting or the like. The substrate 5 may be a circuit board, and the substrate 5 may include through holes 51 . The socket 12 of the reverse connector 1 can be fixed under the base plate 5 by means of screws 7 . The screw 7 can first pass through the through hole 51 of the base plate 5 and the fixing hole 1213 on the housing 121 of the socket 12 from above the base plate 5 in sequence, and then attach to the nut 125 to fix the socket 12 on the base plate 5 . When the socket 12 is disposed on the base plate 5 , the nut 125 is located between the base plate 5 and the connecting portion 1221 of the socket body 122 .

Further, the socket terminal 123 of the socket 12 includes a bending portion 1232 and a fixing portion 1233 . The bent portion 1232 connects the contact portion 1231 and the fixing portion 1233 , and the contact portion 1231 and the fixing portion 1233 are located at two ends of the socket terminal 123 respectively. When the socket 12 is disposed on the substrate 5 , the fixing portion 1233 of the socket terminal 123 is also fixed on the substrate 5 . As shown in FIG. 6B , the fixing portion 1233 of the socket terminal 123 may protrude from the socket body 122 , and the housing 121 of the socket 12 may further include pin openings 1216 . When the socket 12 is disposed on the substrate 5 , the fixing portion 1233 of the socket terminal 123 can pass through the pin opening 1216 and be fixed on the substrate 5 . In practice, the substrate 5 may further include a plurality of solder pads corresponding to the fixing portions 1233 of the socket terminals 123 respectively, and the socket terminals 123 may be electrically connected to the substrate.

In addition, as shown in FIGS. 6A and 6B , the housing 121 of the socket 12 includes a first side 1218 and a second side 1219 . The first side 1218 and the second side 1219 are opposite to each other, and the nut 125 is disposed on the first side 1218 . Further, the housing 121 of the socket 12 includes a protruding structure 1217 disposed on the second side edge 1219 . The insertion portion 1112 of the plug housing 111 of the plug 11 includes a hole 1117 , and the position of the hole 1117 corresponds to the protruding structure 1217 of the housing 121 of the socket 12 . In practice, the first side 1218 is a position where the housing 121 of the socket 12 is close to the substrate 5 , and the second side 1219 is a position away from the substrate 5 . In other words, when the socket 12 is disposed under the substrate 5 , the first side 1218 is located at the top of the housing 121 of the socket 12 , and the second side is located at the bottom of the housing 121 of the socket 12 . The protruding structure 1217 of the socket 12 and the hole 1117 of the plug 11 can be a foolproof mechanism for the reverse connector 1 . The protruding structure 1217 is located at the bottom of the housing 121 of the socket 12 , and the hole 1117 is also located at the bottom of the plug housing 111 of the plug 11 . Therefore, when the plug 11 and the socket 12 are connected to each other, the plug The head 11 can be inserted into the socket 12 without turning, and the protruding structure 1217 of the socket 12 can also be inserted into the hole 1117 of the plug 11 to ensure the connection between the plug 11 and the socket 12, thereby improving the installation convenience and reducing the assembly. working hours.

Please refer to FIG. 6B , FIG. 7A and FIG. 7B . 7A is a schematic cross-sectional view of the structure of the plug 11 of the reverse connector 1 inserted into the socket 12 according to an embodiment of the present invention. FIG. 7B is a schematic cross-sectional view of the structure of the reverse connector 1 of FIG. 7A after the plug 11 is inserted into the socket 12 . As shown in FIG. 6B , FIG. 7A and FIG. 7B , in the present embodiment, the nut 125 of the socket 12 further includes a guide structure 1251 . When the plug 11 is inserted into the socket 12 , the guide structure 1251 of the nut 125 guides the plug housing 111 of the plug 11 to lift up, so as to prevent the plug housing 111 and the nut 125 from interfering with each other. In practice, the shape of the guide structure 1251 of the nut 125 may be a trapezoid or a circular arc. As shown in FIGS. 7A and 7B , when the plug 11 is inserted into the socket 12 , the insertion portion 1112 of the plug 11 is first inserted into the housing 121 of the socket 12 ; then, the insertion portion 1112 of the plug housing 111 is sleeved with the connecting portion of the socket body 122 1221, and the plug circuit board 113 of the plug 11 contacts and spreads the contact portions of the first socket terminal and the second socket terminal. At this time, the insertion portion 1112 of the plug housing 111 is located between the housing 121 of the socket 12 and the connection portion 1221 of the socket body 122 . Further, when the plug 11 is inserted into the socket 12 again, the plug housing 111 of the plug 11 contacts the nut 125 of the socket 12 . At this time, the guide structure 1251 of the nut 125 guides the plug housing 111 to rise. That is, the plug housing 111 of the plug 11 moves along the direction of the guide structure 1251 toward the socket terminal 123, so that the plug housing 111 and the nut 125 do not interfere with each other. In practice, when the socket needs to be reversely disposed under the circuit board due to insufficient product space, the plug 11 can still be inserted into the socket 12 smoothly without being restricted by the nut. Therefore, the reverse connector of the present invention can effectively improve convenience and assembly efficiency through the structure of the socket.

In this specific embodiment, although the plug housing 111 of the plug 11 contacts the nut 125, the plug terminal 114 of the plug 11 has been inserted into the socket terminal 123 of the socket 12. However, in practice, the plug 11 may still shake and swing up and down, thereby reducing assembly efficiency and stability. In the reverse connector of the present invention, the plug housing 111 of the plug 11 can also be restricted between the nut 125 and the socket body 122 by the nut 125, so that the plug 11 is not easy to swing, thereby improving the stability. Further, since the nut of the socket can prevent the interference between the plug housing and the socket, no matter the plug is inserted into the socket in the forward or reverse direction, the plug can be inserted into the socket smoothly, which not only improves the convenience but also reduces the cost of the socket. Assembly hours.

In practice, the connection sequence of the components in the plug and the socket is not limited to this, and may also be in other forms. In a specific embodiment, during the process of inserting the plug into the socket, the plug housing of the plug first contacts the nut of the socket, and after the guide structure of the nut guides the plug housing to rise, the insertion portion of the plug housing is then sleeved with the socket body. connecting part, and the plug terminal of the plug is connected to the socket terminal of the socket. In another specific embodiment, during the process of inserting the plug into the socket, the plug housing of the plug contacts the nut of the socket while the insertion part of the plug housing is sleeved with the connecting part of the socket body; then, the guiding structure of the nut The plug terminals of the plug are connected to the socket terminals of the socket while the guide plug housing is lifted.

Please refer to FIG. 3 and FIG. 4 again. In the present embodiment, the plug 11 further includes a locking fastener 115 disposed on the body portion 1111 of the plug housing 111 , and the locking fastener 115 extends from the body portion 1111 toward the insertion portion 1112 . The housing 121 of the socket 12 further includes a locking hole 1215 corresponding to the locking fastener 115 . In practice, the end of the locking fastener 115 extending to the insertion portion 1112 may include a buckle or a hook structure. After the plug 11 is inserted into the socket 12 , the locking fastener 115 can be connected to the locking hole 1215 of the housing 121 of the socket 12 in a snap-fit or hooking manner to fix the plug 11 and the socket 12 . The plug can be combined with the elastic structure to lift the locking fastener by pressing or directly lift the locking Fasteners, so that the locking fasteners are separated from the locking holes of the socket, and the plug is removed from the socket.

To sum up, the reverse connector of the present invention can prevent the interference between the socket and the plug through the guiding structure of the nut of the socket, so as to improve the assembly efficiency. In addition, in the reverse connector of the present invention, the plug housing of the plug can also be restricted between the nut and the socket body by the nut, so that the plug is not easy to swing, thereby improving the stability. In addition, the reverse connector of the present invention can enable the plug to be inserted into the socket without turning, and can also ensure the connection between the plug and the socket through the protruding structure of the socket and the hole of the plug, which not only improves the convenience, but also ensures the connection between the plug and the socket. Assembly man-hours can be reduced.

Through the detailed description of the preferred embodiments above, it is hoped that the features and spirit of the present invention can be described more clearly, and the scope of the present invention is not limited by the preferred embodiments disclosed above. On the contrary, the intention is to cover various modifications and equivalent arrangements within the scope of the claimed scope of the present invention. Therefore, the scope of the patentable scope for which the present invention is claimed should be construed in the broadest sense in accordance with the above description so as to encompass all possible modifications and equivalent arrangements.

1: reverse connector

11: Plug

12: Socket

111: Plug housing

121: Shell

122: Socket body

125: Nut

Claims (10)

A reverse connector that contains: a plug including a plug housing and a plug terminal, the plug terminal being disposed in the plug housing; and a socket for connecting the plug, the socket further comprising: a housing having an accommodating space and an opening communicating with the accommodating space, and the opening is used for receiving the plug; a socket terminal, disposed in the accommodating space, the socket terminal is used to electrically connect the plug terminal of the plug; and a nut, disposed on the housing and comprising a guiding structure, the nut is located in the accommodating space; Wherein, during the process of inserting the plug into the socket, the plug housing contacts the nut, and the guide structure of the nut guides the plug housing to lift up, so as to prevent the plug housing and the nut from interfering with each other. The reverse connector according to claim 1, wherein the shape of the guiding structure is selected from one of trapezoid and circular arc. The reverse connector as described in claim 1, wherein the housing of the socket further comprises a fixing hole and a fixing structure disposed around the fixing hole, the position of the fixing hole corresponds to the position of the nut, And the fixing structure is used for fixing the nut at the fixing hole. The reverse connector as described in claim 3, wherein the socket is fixed to the base plate through a screw passing through a through hole of a base plate and the fixing hole of the housing and being locked to the nut. The reverse connector as described in claim 4, wherein the socket terminal includes a plurality of socket terminals, each of the socket terminals includes a contact portion, a bent portion and a fixed portion, and the bent portion is connected to the contact part and the fixing part, the contact part is used for connecting the plug terminal of the plug, and the fixing part of the socket terminals is fixed on the substrate. The reverse connector as described in claim 1, wherein the socket terminal comprises a first socket terminal and a second socket terminal, the first socket terminal and the second socket terminal are disposed opposite to each other and form a concave When the plug is connected to the socket, the plug terminal is inserted into the groove and contacts the first socket terminal and the second socket terminal. The reverse connector as described in claim 6, wherein the plug includes a plug circuit board, and the plug terminals are disposed on the plug circuit board, and when the plug is connected to the socket, the plug circuit board is inserted into the plug circuit board in the groove. The reverse connector as described in claim 1, wherein the plug includes a locking fastener disposed on the plug housing, and the housing of the socket includes a locking hole, when the plug is connected to the plug When the socket is installed, the locking fastener is fastened to the locking hole. The reverse connector as described in claim 1, wherein the receptacle comprises a receptacle body, the receptacle body is disposed in the accommodating space, and the receptacle terminal is disposed in the receptacle body, when the plug is connected to the receptacle body When the socket is used, the guide structure of the nut guides the plug housing to lift up, so that the plug housing is sleeved on one end of the socket body. The reverse connector of claim 1, wherein the housing of the receptacle comprises a first side edge, a second side edge and a protruding structure, and the plug housing comprises a hole, the first side One side and the second side are opposite to each other, the nut is arranged on the first side and the protruding structure is arranged on the second side. When the plug is connected to the socket, the protruding structure is embedded in the hole.

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