A plug and socket for discharging a new energy vehicle
By designing a matching structure between the charging gun plug with pins and cylindrical slots and the socket board, the safety and convenience issues of the discharge socket board for new energy vehicles are solved, achieving stable connection and waterproof effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HANGZHOU DONGCHAN TEMPERATURE CONTROL EQUIP CO LTD
- Filing Date
- 2025-06-18
- Publication Date
- 2026-06-23
AI Technical Summary
Existing discharge sockets for new energy vehicles pose an electrical hazard when using ordinary plugs, and the plug connection is inconvenient, affecting safety and convenience.
Design a charging gun plug with prongs and cylindrical slots. The socket plate has matching slots and protrusions. When the prongs are inserted into the socket, the protrusions are inserted into the cylindrical slots for signal transmission. The plug is locked in place by a locking cover to prevent ordinary plugs from being inserted, thus achieving safety and waterproofing.
It improves the convenience and safety of discharging new energy vehicles, prevents the insertion of ordinary plugs, and ensures a stable connection and waterproof effect between the charging gun plug and the socket board.
Smart Images
Figure CN224400787U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of plugs and sockets for discharging new energy vehicles, and in particular to a plug and socket for discharging new energy vehicles. Background Technology
[0002] New energy vehicles refer to automobiles that use unconventional vehicle fuels as their power source (or use conventional vehicle fuels but employ new onboard power systems), integrating advanced technologies in vehicle power control and drive to form vehicles with new technologies and structures. New energy vehicles include pure electric vehicles, range-extended electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, and hydrogen engine vehicles. The current concept of new energy vehicles can be broadly defined as those that convert various forms of energy into electrical energy, using their own batteries to drive an electric motor for vehicle propulsion, while the large-capacity batteries can also discharge externally.
[0003] In existing technologies, in order to meet the daily discharge or charging needs of new energy vehicles, the electric guns equipped with new energy vehicles are often connected to plugs of corresponding specifications through a plug-in method, which is inconvenient to use. At the same time, during discharge, the charging gun plug needs to be plugged into a special discharge socket board. Therefore, the discharge socket board is provided with a slot that matches the charging gun plug. Without any protective measures, if the user accidentally inserts an ordinary plug into the slot, there will be an electrical hazard, which is detrimental to safety. Utility Model Content
[0004] The present invention aims to overcome the shortcomings of existing discharge socket boards that are prone to electrical hazards, and provides a new energy vehicle discharge plug and socket that improves safety performance.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A plug and socket for discharging electricity in new energy vehicles, comprising:
[0007] A charging gun plug, wherein the charging gun plug is provided with pins and cylindrical slots respectively, the pins are fixedly connected to one end of the charging gun plug, and the other end of the charging gun plug is fixed with cables that are electrically connected to the pins and cylindrical slots respectively.
[0008] The socket board has a slot on one side that matches the charging gun plug. The charging gun plug is plugged into the slot. The slot has holes that match the pins and protrusions that connect to the cylindrical slots. The protrusions are fixedly connected to the slot. The other side of the socket board has several sets of socket ports. The pins of the charging gun plug are inserted into the holes and then electrically connected to the socket ports. In this invention, the charging gun plug and the socket board can be accessories that meet European or British standards, so the structural forms of the pins, slots, and socket ports will not be described in detail. When the charging gun plug is inserted into the slot on one side of the socket board, the pins are inserted into the holes while the protrusions are inserted into the corresponding cylindrical slots for signal transmission. This allows the charging gun plug to receive the corresponding signals and discharge, eliminating the need for frequent plugging and replacing of different plugs to achieve the purpose of discharging the charging gun plug, thus improving the convenience of use. At the same time, the protrusions in the slot also help prevent other ordinary plugs from being inserted, thereby improving the safety of use.
[0009] Preferably, the charging gun plug is equipped with a waterproof ring and a locking cover. The waterproof ring is fixedly connected to the outer wall of the charging gun plug, and the locking cover is sleeved on the outside of the charging gun plug and rotatably connected to it. After one end of the charging gun plug is inserted into the slot, it is locked in place by the locking cover engaging with the outer wall of the slot. The waterproof ring is sealed to the open end of the slot by the pressure of the locking cover. After the charging gun plug is inserted into the slot, it is locked by the locking cover, which prevents the charging gun plug from falling out. At the same time, the waterproof ring can seal the gap between the charging gun plug and the slot, which helps to ensure the waterproof effect when the charging gun plug is mated with the slot on the socket board.
[0010] Preferably, the slot protrudes from the surface of the socket plate and has two or more L-shaped locking grooves evenly distributed around the circumference of the slot on its outer side wall. The L-shaped locking grooves are located at the open end of the slot. The inner side wall of the lock cover has two or more locking blocks that match the L-shaped locking grooves one by one. The lock cover has a stepped surface corresponding to the waterproof ring. After one end of the charging gun plug is inserted into the slot, the lock cover is inserted into one end of the corresponding L-shaped locking groove through the locking block. Then, the lock cover is rotated to drive the locking block to rotate synchronously and squeeze into the other end of the L-shaped locking groove to lock. The waterproof ring seals the open end of the slot under the pressing action of the stepped surface. After the charging gun plug is inserted into the slot of the socket plate, the user pushes the lock cover down until the locking block on the lock cover is inserted into one end of the L-shaped locking groove and cannot be pushed down further. Then, the lock cover is rotated so that the locking block rotates synchronously into the other end of the L-shaped locking groove. During the rotation, the locking block is first squeezed by the side wall of the L-shaped locking groove and then enters the other end of the L-shaped locking groove, so that the locking block is limited without the action of external force. The structure is simple and easy to operate. This structure is a conventional locking structure, so it will not be described in detail here.
[0011] Preferably, the number of cylindrical slots and protrusions are both at least two. Each of the two cylindrical slots contains a probe electrically connected to the cable, and each of the two corresponding protrusions contains a spring pin. The socket plate contains a grounding wire and two resistors electrically connected to the charging gun plug. The grounding wire is electrically connected to the bottom of the spring pins in the two protrusions via the two resistors, and the top of the spring pins is in contact with the corresponding probes for conduction. During the insertion of the charging gun plug into the socket plate slot, after the protrusion is inserted into the corresponding cylindrical slot, the spring pin is electrically connected to the grounding wire via the resistors. Therefore, the spring pin transmits signals through its corresponding probes, allowing the charging gun plug to receive the corresponding signals and discharge. This eliminates the need for frequent plugging and replacing of different plugs, improving ease of use. The charging gun plug is equipped with a grounding hardware electrically connected to the grounding wire. Since the charging gun plug uses a European or British standard plug, its structure will not be described in detail.
[0012] Preferably, the socket board contains fixed live wire hardware, neutral wire hardware, and ground wire hardware. The live wire hardware includes a conductive substrate and several live wire clamps. These clamps are distributed along the length of the conductive substrate and fixedly connected to it. One live wire clamp is positioned within a corresponding hole of the socket and is plugged into / out of the plug pin. The remaining live wire clamps are positioned within corresponding holes of several sets of socket openings. The neutral wire hardware includes a conductive substrate and several neutral wire clamps. A neutral wire clamp is distributed along the length of the conductive substrate two and is fixedly connected to the conductive substrate two. One neutral wire clamp is positioned in the corresponding hole of the socket and is plugged in and out of the socket. The remaining neutral wire clamps are respectively positioned in the corresponding holes of several sets of socket openings. The ground wire hardware two includes a conductive substrate three and several ground wire clamps. The several ground wire clamps are distributed along the length of the conductive substrate three and are fixedly connected to the conductive substrate three. The several ground wire clamps are respectively positioned in the corresponding holes of several sets of socket openings. The clamping parts of each hardware component in the socket board mainly facilitate the plug insertion and conduction of the circuit. This structure and the fixing structure of each hardware component in the socket board are existing technologies, so they will not be described in detail here. Each hardware clamp is connected through a corresponding conductive substrate, which is beneficial to realize the circuit conduction between the socket hole in the slot and the socket opening, while the simple structure helps to reduce the size of the socket board.
[0013] Preferably, one side of the socket panel is provided with a safety door one covering the live wire and neutral wire positions on the socket. Safety door one is elastically connected to the interior of the socket panel under the drive of the plug pins to open and close the corresponding positions on the socket. The corresponding other side of the socket panel is provided with a safety door two covering the live wire and neutral wire positions inside the socket opening. Safety door two is elastically connected to the interior of the socket panel to open and close the corresponding positions on the socket opening. Safety doors one and two improve safety during use; their structure is existing technology and will not be described in detail here.
[0014] The beneficial effects of this utility model are:
[0015] 1. When the pins are inserted into the socket, the protrusions are inserted into the corresponding cylindrical slots for signal transmission, so that the charging gun plug can receive the corresponding signals and discharge. Therefore, the charging gun plug can be used for discharge without frequently plugging and replacing different plugs, which improves the convenience of use.
[0016] 2. The protruding post inside the slot also helps prevent other ordinary plugs from being inserted, thus improving the safety of use.
[0017] 3. After the charging gun plug is inserted into the slot, it is locked by the locking cover to prevent the charging gun plug from falling off. At the same time, the waterproof ring can seal the gap between the charging gun plug and the slot, which helps to ensure the waterproof effect when the charging gun plug is mated with the slot on the socket board. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of the British standard plug and socket of this utility model;
[0019] Figure 2 yes Figure 1 A schematic diagram of the charging gun plug;
[0020] Figure 3 yes Figure 1 Schematic diagram of the middle socket board;
[0021] Figure 4 yes Figure 3 A schematic diagram of the internal structure of one side of the socket board slot;
[0022] Figure 5 yes Figure 3 A schematic diagram of the internal structure of the corresponding side of the middle socket panel;
[0023] Figure 6 This is a structural schematic diagram of a utility model European standard plug and socket;
[0024] Figure 7 yes Figure 6 A schematic diagram of the charging gun plug;
[0025] Figure 8 yes Figure 6 Schematic diagram of the middle socket board;
[0026] Figure 9 yes Figure 8 A schematic diagram of the internal structure of one side of the socket board slot;
[0027] Figure 10 yes Figure 8 A schematic diagram of the internal structure of the socket panel on the opposite side.
[0028] In the diagram: 1. Charging gun plug, 2. Pin, 3. Cylindrical groove, 4. Cable, 5. Socket plate, 6. Slot, 7. Protrusion, 8. Socket opening, 9. Waterproof ring, 10. Lock cover, 11. L-shaped lock groove, 12. Lock block, 13. Stepped surface, 14. Probe, 15. Spring pin, 16. Ground wire hardware one, 17. Resistor, 18. Live wire hardware, 19. Neutral wire hardware, 20. Ground wire hardware two, 21. Conductive substrate one, 22. Live wire clamp, 23. Conductive substrate two, 24. Neutral wire clamp, 25. Conductive substrate three, 26. Ground wire clamp, 27. Safety door one, 28. Safety door two, 29. Socket. Detailed Implementation
[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0030] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0031] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of components illustrated in these embodiments do not limit the scope of this application. For ease of illustration, spatial relative terms such as “upper,” “lower,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “below” other elements or features would be fixed “upper” to other elements or features. Thus, the exemplary term “lower” can include both upper and lower orientations. The device may be fixed in other ways (rotated 90 degrees or located in other orientations), and the spatial relative descriptions used herein can be interpreted accordingly. It should also be understood that, for ease of description, the dimensions of the various parts shown in the figures are not drawn to actual scale. Techniques, processes, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, processes, and equipment should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limiting. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be discussed further in subsequent figures.
[0032] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.
[0033] like Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7 and Figure 8 In the described embodiment, a plug and socket for discharging new energy vehicles includes a charging gun plug 1, on which pins 2 and cylindrical slots 3 are respectively provided. The pins 2 are fixedly connected to one end of the charging gun plug 1, and the other end of the charging gun plug 1 is fixedly connected to a cable 4 that is electrically connected to the pins 2 and the cylindrical slots 3 respectively. A socket plate 5 is provided on one side of the socket plate 5, which is provided with a slot 6 that matches the charging gun plug 1. The charging gun plug 1 is plugged into and detached from the slot 6. The slot 6 is provided with a socket hole 29 that matches the pins 2 and a protrusion 7 that is plugged into and detached from the cylindrical slots 3 respectively. The protrusion 7 is fixedly connected to the slot 6. On the other side of the socket plate 5, there are several sets of socket ports 8. After the pins 2 on the charging gun plug 1 are inserted into the socket hole 29, they are electrically connected to the socket ports 8.
[0034] The charging gun plug 1 is provided with a waterproof ring 9 and a locking cover 10. The waterproof ring 9 is fixedly connected to the outer side wall of the charging gun plug 1. The locking cover 10 is sleeved on the outside of the charging gun plug 1 and is rotatably connected to the charging gun plug 1. After one end of the charging gun plug 1 is inserted into the slot 6, it is locked by the locking cover 10 cooperating with the outer side wall of the slot 6. The waterproof ring 9 is sealed to the open end of the slot 6 under the pressing action of the locking cover 10.
[0035] The slot 6 protrudes from the surface of the socket plate 5 and has two or more L-shaped locking grooves 11 evenly distributed around the circumference of the slot 6 on its outer side wall. The L-shaped locking grooves 11 are located at the open end of the slot 6. The inner side wall of the lock cover 10 has two or more locking blocks 12 that match the L-shaped locking grooves 11 one by one. The lock cover 10 has a stepped surface 13 corresponding to the waterproof ring 9. After one end of the charging gun plug 1 is inserted into the slot 6, the lock cover 10 is inserted into one end of the corresponding L-shaped locking groove 11 through the locking block 12. Then, the lock cover 10 is rotated to drive the locking block 12 to rotate synchronously and squeeze into the other end of the L-shaped locking groove 11 to lock. The waterproof ring 9 seals the open end of the slot 6 under the pressing action of the stepped surface 13.
[0036] like Figure 2 , Figure 3 , Figure 7 and Figure 8 As shown, the number of cylindrical grooves 3 and protrusions 7 is at least two. Each of the two cylindrical grooves 3 contains a probe 14 electrically connected to the cable 4, and each of the two corresponding protrusions 7 contains a spring pin 15. Figure 4 and Figure 9 As shown, the socket plate 5 has a ground wire hardware 16 and two resistors 17 that are electrically connected to the charging gun plug 1. The ground wire hardware 16 is electrically connected to the bottom end of the spring pin 15 in the two protrusions 7 through the two resistors 17 respectively. The top end of the spring pin 15 is in contact with the corresponding probe 14 and conducts electricity.
[0037] like Figure 4 , Figure 5 , Figure 9 and Figure 10As shown, the socket board 5 is equipped with live wire hardware 18, neutral wire hardware 19, and ground wire hardware 20. Live wire hardware 18 includes a conductive substrate 21 and several live wire clamps 22. These clamps are distributed along the length of the conductive substrate 21 and are fixedly connected to it. One live wire clamp 22 is positioned within a corresponding hole in the socket 29 and is plugged into / out of the plug pin 2. The remaining live wire clamps 22 are positioned within corresponding holes in several sets of socket openings 8. Neutral wire hardware 19 includes a conductive substrate 23 and several neutral wire clamps 24. The neutral wire clamp 24 is distributed along the length of the conductive substrate 23 and is fixedly connected to the conductive substrate 23. One of the neutral wire clamps 24 is positioned in the corresponding hole of the socket 29 and is plugged into and disconnected from the pin 2. The remaining neutral wire clamps 24 are respectively positioned in the corresponding holes of several sets of socket ports 8. The ground wire hardware 20 includes a conductive substrate 3 25 and several ground wire clamps 26. The several ground wire clamps 26 are distributed along the length of the conductive substrate 3 25 and are fixedly connected to the conductive substrate 3 25. The several ground wire clamps 26 are respectively positioned in the corresponding holes of several sets of socket ports 8.
[0038] The socket panel 5 has a safety door 27 on one side that covers the live wire and neutral wire positions on the socket 29. The safety door 27 is elastically connected to the inside of the socket panel 5 under the drive of the plug pin 2 to open and close the corresponding positions of the socket 29. The corresponding side of the socket panel 5 has a safety door 28 that covers the live wire and neutral wire positions inside the socket opening 8. The safety door 28 is elastically connected to the inside of the socket panel 5 to open and close the corresponding positions of the socket opening 8.
[0039] In this utility model, the charging gun plug 1 and the socket plate 5 can be accessories of corresponding standards such as European standard or British standard, so the structural forms of the plug 2, slot 6 and socket 8 will not be described in detail. The charging gun plug 1 is inserted into the slot 6 on one side of the socket plate 5. During this process, the plug 2 is inserted into the socket hole 29 and the protrusion 7 is inserted into the corresponding cylindrical groove 3. The ground wire 16 is connected to the bottom end of the spring pin 15 through the resistor 17. The top end of the spring pin 15 is connected to its corresponding probe 14 for signal transmission, so that the charging gun plug 1 can receive the corresponding signal and discharge. Therefore, the charging gun plug 1 can be discharged without frequently plugging and replacing different plugs, which improves the convenience of use. At the same time, the protrusion 7 in the slot 6 also helps to prevent other ordinary plugs from being inserted, which helps to improve the safety of use.
[0040] After the charging gun plug 1 is inserted into the slot 6, the user pushes the lock cover 10 down until the locking block 12 on the lock cover 10 is inserted into one end of the L-shaped lock groove 11 and cannot be pushed down further. Then the lock cover 10 is rotated so that the locking block 12 rotates synchronously into the other end of the L-shaped lock groove 11. During the rotation, the locking block 12 is first squeezed by the side wall of the L-shaped lock groove 11 and then enters the other end of the L-shaped lock groove 11, so that the locking block 12 is limited without the action of external force.
[0041] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A plug and socket for discharging new energy vehicles, characterized in that it includes: A charging gun plug (1) is provided with a pin (2) and a cylindrical groove (3) respectively. The pin (2) is fixedly connected to one end of the charging gun plug (1), and the other end of the charging gun plug (1) is fixed with a cable (4) that is electrically connected to the pin (2) and the cylindrical groove (3) respectively. A socket plate (5) is provided on one side with a slot (6) that matches the charging gun plug (1). The charging gun plug (1) is plugged into and disconnected from the slot (6). The slot (6) is provided with a socket hole (29) that matches the pin (2) and a protrusion (7) that is plugged into and disconnected from the cylindrical groove (3). The protrusion (7) is fixedly connected to the slot (6). The other side of the socket plate (5) is provided with several sets of socket ports (8). After the pin (2) on the charging gun plug (1) is inserted into the socket hole (29), it is electrically connected to the socket port (8).
2. The plug and socket for discharging new energy vehicles according to claim 1, characterized in that, The charging gun plug (1) is provided with a waterproof ring (9) and a locking cover (10). The waterproof ring (9) is fixedly connected to the outer wall of the charging gun plug (1). The locking cover (10) is sleeved on the outside of the charging gun plug (1) and rotatably connected to the charging gun plug (1). After one end of the charging gun plug (1) is inserted into the slot (6), it is locked by the locking cover (10) cooperating with the outer wall of the slot (6). The waterproof ring (9) is sealed to the open end of the slot (6) under the pressing action of the locking cover (10).
3. A plug and socket for discharging new energy vehicles according to claim 2, characterized in that, The slot (6) protrudes from the surface of the socket plate (5) and has two or more L-shaped locking grooves (11) evenly distributed around the circumference of the slot (6) on its outer side wall. The L-shaped locking grooves (11) are located at the open end of the slot (6). The inner side wall of the lock cover (10) has two or more locking blocks (12) that match the L-shaped locking grooves (11) one by one. The lock cover (10) has a stepped surface (13) corresponding to the waterproof ring (9) inside. After one end of the charging gun plug (1) is inserted into the slot (6), the lock cover (10) is inserted into one end of the corresponding L-shaped locking groove (11) through the locking block (12). Then, the lock cover (10) is rotated to drive the locking block (12) to rotate synchronously and squeeze into the other end of the L-shaped locking groove (11) to lock. The waterproof ring (9) seals the open end of the slot (6) under the pressing action of the stepped surface (13).
4. A plug and socket for discharging new energy vehicles according to claim 1, characterized in that, The number of cylindrical grooves (3) and the number of protrusions (7) are both at least two. Each of the two cylindrical grooves (3) is fixed with a probe (14) that is electrically connected to the cable (4), and each of the two protrusions (7) is fixed with a spring pin (15). The socket plate (5) is fixed with a ground wire hardware (16) that is electrically connected to the charging gun plug (1) and two resistors (17). The ground wire hardware (16) is electrically connected to the bottom end of the spring pin (15) in the two protrusions (7) through the two resistors (17). The top end of the spring pin (15) is in contact with the corresponding probe (14) and conducts electricity.
5. A plug and socket for discharging new energy vehicles according to claim 4, characterized in that, The socket plate (5) is fixed with live wire hardware (18), neutral wire hardware (19) and ground wire hardware (20). The live wire hardware (18) includes a conductive substrate (21) and several live wire clamps (22). The several live wire clamps (22) are distributed along the length of the conductive substrate (21) and are fixedly connected to the conductive substrate (21). One of the live wire clamps (22) is positioned in the corresponding hole of the socket (29) and is plugged into and disconnected from the pin (2). The other live wire clamps (22) are respectively positioned in the corresponding holes of several sets of socket ports (8). The neutral wire hardware (19) includes a conductive substrate (23) and several neutral wire clamps (24). Several neutral wire clamps (24) are distributed along the length of the conductive substrate (23) and are fixedly connected to the conductive substrate (23). One of the neutral wire clamps (24) is positioned in the corresponding hole of the socket (29) and is plugged into and disconnected from the pin (2). The remaining neutral wire clamps (24) are respectively positioned in the corresponding holes of several sets of sockets (8). The ground wire hardware (20) includes a conductive substrate (25) and several ground wire clamps (26). Several ground wire clamps (26) are distributed along the length of the conductive substrate (25) and are fixedly connected to the conductive substrate (25). Several ground wire clamps (26) are respectively positioned in the corresponding holes of several sets of sockets (8).
6. A plug and socket for discharging new energy vehicles according to claim 5, characterized in that, The socket plate (5) has a safety door (27) on one side that covers the live wire hole and the neutral wire hole on the socket (29). The safety door (27) is elastically connected to the inside of the socket plate (5) under the drive of the pin (2) to open and close the corresponding hole of the socket (29). The socket plate (5) has a safety door (28) on the other side that covers the live wire hole and the neutral wire hole in the socket opening (8). The safety door (28) is elastically connected to the inside of the socket plate (5) to open and close the corresponding hole of the socket opening (8).