Secondary power connection structure and socket

Abstract

The utility model discloses a secondary power connection structure and a socket, which are arranged in electric connectors, are connected / disconnected through at least two electric connectors to form a trigger signal feedback to control the electric connectors to conduct or cut off power, and comprise a push block corresponding to a movable connection part of the electric connectors and a group of contact pieces, the contact pieces are connected in series to a signal circuit of the electric connector; the contact piece comprises a movable contact piece and a fixed contact piece which are in a normally open relation, the movable contact piece is provided with a movable main contact which is pushed by the push block to be in contact with the fixed contact piece, and the fixed contact piece is provided with a bearing part which is correspondingly in contact with the movable main contact, is attached to the movable contact and provides elastic limiting force. The electric connector is simple in structure, and can improve the problem of unstable power connection caused by possible deformation of the original contact piece.

Description

Technical Field

[0001] The utility model belongs to the technical field of sockets, and particularly relates to a secondary power connection structure and a socket. Background Art

[0002] The existing socket structure is mainly composed of key components such as a front panel, a fixing bracket, a safety door, socket sleeves, and a base. It is a fixed connector used to connect the plug of an electrical appliance to an external power supply circuit. The safety door structure is composed of a PC flame-retardant material part and a spring. Its original design intention is to prevent children from accidentally touching the socket, effectively avoiding the occurrence of electric shock accidents and providing an important guarantee for household safety. The socket sleeves are the core components connected to the plug and are made of tin phosphor bronze material with excellent electrical conductivity, thermal conductivity, and mechanical elasticity to ensure the stability and safety of current transmission. The base further plays a role in insulation and fixing the socket sleeves, the safety door, and the wiring terminals to ensure the stability and safety of the entire socket structure.

[0003] In the existing socket structure, arc situations often occur. The reasons can be attributed to multiple aspects. First of all, poor contact is one of the main reasons for generating arcs. After the socket is old and loose, the contact resistance between the plug and the socket increases, and arcs are easily generated during the plugging and unplugging process. Secondly, overloading of the circuit is also an important factor for arc generation. Long-term overloading not only leads to arc phenomena but also accelerates the aging of electrical equipment. In addition, hesitant plugging and unplugging actions or poor socket quality may also cause arcs. The essence of an arc is that when two conductors are in a virtual connection state, the voltage directly breaks down the air to generate current. Since the air resistance is relatively large, the current has the characteristics of high temperature and light emission when flowing in the air.

[0004] In the existing socket structure or other electrical connectors with the same function, there is a secondary power connection structure, that is, before the two electrical connectors are connected to each other, there is also a disconnecting switch in the electrical connector used to connect the external power supply circuit. This disconnecting switch remains in the off state when the other electrical connector is not connected, and when the other electrical connector is completely connected, the disconnecting switch conducts, so as to achieve the effect of transferring arcs. However, for this secondary power connection arc transfer structure, metal contact pieces that move with the movable end are usually used. After multiple plugging and unplugging connections, the service life of this metal contact piece is relatively short, and the cost is relatively high. Summary of the Utility Model

[0005] In order to solve the problems existing in the prior art, the utility model provides a secondary power connection structure and a socket, aiming to change the internal secondary power connection structure to achieve the effects of improving service life, stability, and low cost.

[0006] The technical solution adopted by the utility model is as follows:

[0007] In a first aspect, the present utility model provides a secondary electrical connection structure, which is arranged in an electrical connector to form a trigger signal feedback to control the conduction / power-off of the electrical connector through the connection / disconnection of at least two electrical connectors, including a push block corresponding to the movable connection part of the electrical connector and a set of contact pieces, and the contact pieces are connected in series on the signal circuit of the electrical connector;

[0008] The contact piece includes a movable contact piece and a fixed contact piece in a normally open relationship. The movable contact piece has a movable main contact pushed by the push block to contact the fixed contact piece, and the fixed contact piece has a receiving part corresponding to contact the movable main contact and forming an elastic limiting force by attaching to the movable contact piece.

[0009] Combined with the first aspect, the present utility model provides a first implementation manner of the first aspect. The receiving part is an opening provided on the fixed contact piece and a shielding member provided at the opening and shielding the end face of the opening, and the shielding member is elastically connected to the fixed contact piece.

[0010] Combined with the first implementation manner of the first aspect, the present utility model provides a second implementation manner of the first aspect. The shielding member is an electricity-connecting elastic piece. When the movable main contact pushes open the electricity-connecting elastic piece and passes through the opening, the electricity-connecting elastic piece fits on the surface of the movable main contact.

[0011] Combined with the second implementation manner of the first aspect, the present utility model provides a third implementation manner of the first aspect, including two fixed contact pieces connected to the signal circuit. The fixed contact pieces are arranged at intervals and form an opening between the two fixed contact pieces. The opening is blocked by two electricity-connecting elastic pieces respectively arranged on the fixed contact pieces. The movable main contact simultaneously contacts the two electricity-connecting elastic pieces to connect the two fixed contact pieces to form the connection of the signal circuit.

[0012] ... Combined with the third implementation manner of the first aspect, the present utility model provides a fourth implementation manner of the first aspect. The movable contact piece is provided with a movable auxiliary contact, and the fixed contact piece is provided with a fixed contact arranged at intervals with the movable auxiliary contact and contacting by abutting.

[0013] Combined with the fourth implementation manner of the first aspect, the present utility model provides a fifth implementation manner of the first aspect. The end of the push block has a sliding groove, and the fixed contact piece is elastically connected to the contact piece arranged in the sliding groove through a contact piece spring and elastically slides in the sliding groove through the contact piece spring.

[0014] Combined with the first aspect, the present utility model provides a sixth implementation manner of the first aspect, further including a feedback module. The signal line of the signal circuit penetrates into the feedback module and is electrically connected to the contact piece inserted into the feedback module.

[0015] Combined with the sixth implementation manner of the first aspect, the present utility model provides a seventh implementation manner of the first aspect, further including an insurance module for detecting the abnormal state of the connected electrical connector. The feedback module in the normally open state and the insurance module in the normally closed state are connected in series on the signal circuit;

[0016] The abnormal state includes one or more of overheating, overcurrent, overvoltage, overfrequency, short circuit, and leakage.

[0017] In the second aspect, the present utility model further provides a socket, provided with the above-mentioned secondary power connection structure, including a housing having jacks and terminal blocks arranged in the jacks, and the terminal blocks are connected to an external power supply circuit;

[0018] The push block has a pushing end, and the projection of the pushing end on the opening end face of the jack has an overlapping area with the jack.

[0019] Among them, the signal circuit and the external power supply circuit share a wire harness and maintain insulation isolation.

[0020] Combined with the second aspect, the present utility model provides a first implementation manner of the second aspect. A signal lamp for indicating the on / off of the signal circuit is further provided inside the housing, and an opening for exposing the signal lamp is provided on the housing.

[0021] The beneficial effects of the present utility model are as follows:

[0022] The present utility model adopts a structure in which independent fixed contact pieces and movable contact pieces cooperate with a push block, which has better adaptability to plugs, lower costs, and better protection effects. At the same time, the original direct abutting method of the push block is changed, and the connection of two conductive structures is realized by means of elastic limit attachment, avoiding the deformation of the conductive structures caused by long-term abutting and affecting their connection stability. At the same time, the original method of pushing the elastic switch to close is also changed, improving the connection stability. Description of the Drawings

[0023] Figure 1 is the first structural schematic diagram of the secondary power connection socket and the plug in the embodiment of the present utility model;

[0024] Figure 2 is the second structural schematic diagram of the secondary power connection socket and the plug in the embodiment of the present utility model;

[0025] Figure 3 is the side view of the first secondary power connection structure applied in the socket and connected to the plug in the embodiment of the present utility model;

[0026] Figure 4 is the axonometric view of the first secondary power connection structure applied in the socket and connected to the plug in the embodiment of the present utility model;

[0027] Figure 5is the present utility model Figure 4 partial enlarged schematic view of part B in it;

[0028] Figure 6 is the first axonometric view of the first secondary power connection structure in the socket in the embodiment of the present utility model;

[0029] Figure 7 is the second axonometric view of the first secondary power connection structure in the socket in the embodiment of the present utility model;

[0030] Figure 8 is the first axonometric view of the first secondary power connection structure in the embodiment of the present utility model;

[0031] Figure 9 is the second axonometric view of the first secondary power connection structure in the embodiment of the present utility model;

[0032] Figure 10 is the side view of the application of the second secondary power connection structure in the socket in the embodiment of the present utility model;

[0033] Figure 11 is the axonometric view of the application of the second secondary power connection structure in the socket in the embodiment of the present utility model;

[0034] Figure 12 is the present utility model Figure 11 partial enlarged schematic view of part A in it.

[0035] In the figure: 1 - push block, 2 - movable contact piece, 3 - fixed contact piece, 4 - terminal, 5 - return spring, 6 - feedback module, 7 - signal wire, 8 - insurance module, 9 - plug, 10 - housing, 11 - signal lamp, 12 - movable main contact, 13 - movable auxiliary contact, 14 - power connection elastic piece, 15 - fixed contact, 16 - sliding groove, 17 - contact piece spring, 18 - contact piece fixing part. Detailed implementation manners

[0036] The following further explains the present utility model in conjunction with the accompanying drawings and specific embodiments.

[0037] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Usually, the components of the embodiments of the present application described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0038] Accordingly, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0039] It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0040] In the description of the present application, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed when in use. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present application. In addition, in the description of the present application, if terms such as "first", "second", etc. are used only for distinguishing descriptions, they cannot be understood as indicating or implying relative importance.

[0041] In addition, in the description of the present application, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0042] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "connected" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0043] Embodiment 1:

[0044] This embodiment discloses a secondary power connection structure, which is applied in an electrical connector and is used to control the connection state between one of at least two detachable electrical connectors and an external power supply circuit. In this embodiment, there are two common electrical connectors, and an additional switch assembly can be regarded as being provided in one of the electrical connectors to achieve the effect of secondary power connection.

[0045] Among them, one set of electrical connectors adopts male and female connection mode, refer to Figure 1 and Figure 2 The secondary power connection structure in this embodiment is located within the female electrical connector and is used to trigger state changes when the male connector is inserted or removed. Unlike existing secondary power connection triggering methods, the secondary power connection structure in this embodiment uses a "weak current controls high current" method to trigger and generate feedback signals for power supply control.

[0046] Specifically, it includes a push block 1 that is arranged in the shell 10 of the female electrical connector and performs limited movement. The push block 1 corresponds to the external male electrical connector. When the male electrical connector is inserted into the female electrical connector, the push block 1 contacts and moves, and a reset spring 5 is provided in the female electrical connector to provide a reset force to the push block 1.

[0047] It also includes a group of isolated contacts arranged in the female electrical connector, which include a fixed contact 3 and a movable contact 2. The movable contact 2 is restricted in movement in the female electrical connector, and the push block 1 has a trigger end that contacts and pushes the movable contact 2 to move toward the fixed contact 3 and connect.

[0048] The female electrical connector is provided with a high-voltage circuit connected to an external power supply circuit and a separate signal circuit. A set of contacts are connected in series to the signal circuit and remain disconnected when not subjected to external force, so that the signal circuit is originally in an open-circuit state.

[0049] In another embodiment, a contact structure that is originally in a contact connection state can be used to keep the signal circuit in a normally closed state when not subjected to external force. For those skilled in the art, this has the same effect as the state change achieved by the above method to form a trigger signal.

[0050] This embodiment is explained based on the solution of normally open contacts. There is a space in the female electrical connector for setting a movable push block 1 and two contacts, including two fixed contacts 3 and one movable contact 2, wherein the two fixed contacts 3 are symmetrically arranged and respectively connected to a signal line 7, the push block 1 corresponds to the movable contact 2, and the movable contact 2 is transmission-connected to the push block 1 or fixedly set on the push block 1.

[0051] In an embodiment of the transmission setting connection, the push block 1 has a trigger end that directs the movable contact 2 toward the fixed contact 3, and the trigger end and the fixed contact 3 always maintain a spaced state, and the movable stroke of the movable contact 2 is less than or equal to the movable stroke of the push block 1, and the maximum movable position of the push block 1 corresponds to the position where the movable contact 2 is in stable contact and conduction with the fixed contact 3, thereby avoiding the structural stability of the movable contact 2 being affected by the transitional activity of the push block 1.

[0052] In the embodiment of the fixed setting, the movable contact piece 2 moves along with the push block 1. The movable contact piece 2 itself serves as a conductor for connecting two fixed contact pieces 3 to conduct electricity, that is, the push block 1 pushes the movable contact piece 2 to connect the two fixed contact pieces 3 in series at the same time, thereby conducting the signal circuit.

[0053] Further, referring to Figures 3 - 9 , this embodiment optimizes and defines the secondary power connection structure, mainly for use in the socket for the secondary power connection between the plug 9 and the socket.

[0054] The trigger end portion includes a movable main contact 12 and two movable sub - contacts 13. The middle is a conical movable main contact 12 structure that bulges outward, and on both sides are two movable sub - contacts 13 with a raised height lower than that of the movable main contact 12 and symmetrically arranged.

[0055] Among them, the fixed contact piece 3 has a receiving portion that correspondingly contacts the movable main contact 12 and forms an elastic limiting force by attaching to the movable contact. The receiving portion is an opening provided on the fixed contact piece 3 and a shielding member provided at the opening and covering the end face of the opening. The shielding member is elastically connected to the fixed contact piece 3.

[0056] In some embodiments, the shielding member is a spring structure, that is, it is arranged at a circular opening of the receiving portion. The spring shields and narrows the opening. The corresponding movable main contact 12 is also a circular convex structure, which can be pushed by the push block 1 and abuts against the end of the spring. As the push block 1 continues to act, the movable main contact 12 is pushed to compress the spring towards the opening end face and continuously move through the opening end face. During this process, the fixed contact piece 3 never directly contacts the movable main contact 12, thus avoiding permanent deformation after exceeding the original elastic abutment structure or excessive movement of the switch structure.

[0057] In some embodiments, referring to Figures 6 - 9 , the figure shows a setting method of the shielding member, that is, the power - receiving elastic pieces 14 are respectively arranged on two symmetric fixed contact pieces 3. The gap between the two fixed contact pieces 3 is the opening, and the opening size is larger than the size of the movable main contact 12. The two power - receiving elastic pieces 14 are arranged oppositely to form a movable component blocking in the opening and are inclined away from the movable main contact 12. The movable main contact 12 maintains a certain distance from the two power - receiving elastic pieces 14 in the initial state. When the push block 1 pushes the movable main contact 12 towards the fixed contact piece 3, the movable main contact 12 will first contact the surfaces of the two power - receiving elastic pieces 14, and at this time, the two fixed contact pieces 3 conduct electricity. When the push block 1 continuously pushes the movable main contact 12 to move, after the movable main contact 12 keeps contacting the two power - receiving elastic pieces 14, it pushes the power - receiving elastic pieces 14 to both sides. The power - receiving elastic pieces 14 form an elastic bend with the fixed contact piece 3, and finally maintain the maximum bending angle after the movable main contact 12 passes through the opening.

[0058] In this setting method, when the power connection elastic piece 14 rotates towards both sides, it maintains contact with the movable main contact 12 through its own deformation characteristics. However, while in contact, the force exerted by the movable main contact 12 on the power connection elastic piece 14 is constantly changing direction, and the force received by the fixed contact pieces 3 on both sides in the moving direction of the movable main contact 12 gradually decreases. This avoids deformation of the fixed contact piece 3 when the push block 1 excessively pushes the movable contact piece 2 to connect with the fixed contact piece 3, so that the connection stability between the fixed contact piece 3 and the movable contact piece 2 can still be maintained after multiple uses.

[0059] Meanwhile, two fixed contacts 15 are respectively arranged on both sides of the power connection elastic piece 14. The fixed contacts 15 correspond to the structure of the movable sub-contact 13. When the movable main contact 12 contacts and deforms with the power connection elastic piece 14, the fixed contacts 15 are connected to the movable sub-contact 13, which can increase the stability.

[0060] Furthermore, referring to Figure 3 , the push block 1 is of a plate structure, with two symmetrically arranged protrusions on both sides. A return spring 5 is sleeved on each protrusion, and the return spring 5 provides a return force for the push block 1 to move towards one side. A conical protrusion serving as a trigger end is provided at the midline position on the end face on one side of the protrusion. A sliding groove 16 is provided at the end of the conical protrusion, and a contact spring 17 is arranged in the sliding groove 16, and is movably connected to the movable contact piece 2 through the contact spring 17.

[0061] Furthermore, referring to Figure 3 , an independent feedback module 6 is provided at the lower part of the contact piece structure. Two signal lines 7 are connected to the lower side of the feedback module 6, and the fixed contact piece 3 and the movable contact piece 2 have connection ends extending towards the feedback module 6 and inserted into the feedback module 6. The two connection ends are respectively independently connected to a corresponding signal line 7 in the feedback module 6.

[0062] Meanwhile, referring to Figure 8 , a contact piece fixing member 18 is also provided between the contact piece structure and the feedback module 6. This structure is connected to the housing 10 and is used to fix the contact piece structure.

[0063] The secondary power connection structure in this embodiment further includes an insurance module 8. Referring to Figure 4 and Figure 5 , of the two signal lines 7 led out from the feedback module 6, one extends in the same direction as the external power supply circuit, and the other is connected to the insurance module 8. Then, the insurance module 8 has a signal line 7 passing through and extends outward together with the external power supply circuit.

[0064] In the above setting method, the feedback module 6 and the insurance module 8 are connected in series in the signal circuit of the female head electrical connector. Among them, the two contact pieces of the feedback module 6 remain in an open state, while the signal line 7 in the insurance module 8 remains in a normally closed connection state.

[0065] The insurance module 8, as a kind of sensor, is used to detect the abnormal electrical connection state in the female electrical connector. The abnormal states include overcurrent, overvoltage, overheating, overclocking, short circuit, leakage, etc. when the two connectors are connected, that is, it includes types such as current transformers, thermistors, leakage detectors, etc. It can adopt the method of independently supplying power to control the on-off of the signal circuit, or directly access the signal circuit as a normally closed switch. When an abnormal state occurs, the insurance module 8 changes to an open state, causing the signal circuit to be disconnected and triggering the control signal, thus achieving the protection effect on the circuit.

[0066] Furthermore, this embodiment also provides a socket, which is provided with the secondary electrical connection structure mentioned in the above solution. Refer to Figures 1 - 9 .

[0067] Among them, the male electrical connector is Figure 1 the plug 9 with a two-pin specification shown in Figure 1 and the female electrical connector is the complete socket structure shown in

[0068] Refer to Figure 2 . Each jack is correspondingly provided with a wiring terminal 4 made of metal. Each wiring terminal 4 has a hollow area inside. The push block 1 is arranged close to the wiring terminal 4 and has a pushing end that intrudes into the hollow area. After the pin of the external plug 9 is inserted and enters the hollow area, it will push out the pushing end and push the push block 1 to one side.

[0069] Refer to Figure 2 . In this embodiment, the push block 1 is provided with three pushing ends, two of which are symmetrically arranged on the end face of the push block 1 for corresponding to the two-pin plug 9, and the pushing end arranged in the middle corresponds to the middle pin of the three-pin structure. This symmetrical and central setting method avoids the lateral force on the push block 1 and prevents it from deflecting.

[0070] Furthermore, in this embodiment, an independent circuit board is arranged in the internal space of the socket close to the panel. The circuit board is provided with a signal lamp 11. A feedback mechanism is formed by connecting the circuit board with the signal line 7. When the signal line 7 is connected, the current supply causes the signal lamp 11 to light up to indicate that the socket is normally powered on. When the signal line 7 is disconnected, the signal lamp 11 goes out for indication.

[0071] Furthermore, the socket in this embodiment is used as a discharge socket for connecting a vehicle to achieve discharge. Among them, the signal line 7 and the external power supply circuit are connected to the vehicle by the same wire harness wrapping. The signal line 7 is separately connected to the vehicle as a signal feedback. Once the plug 9 is inserted, the signal circuit is connected. The vehicle end receives the signal to confirm that the plug 9 is inserted, and immediately supplies power through the external power supply circuit after meeting other discharge conditions.

[0072] The utility model is not limited to the above optional embodiments, and any person can obtain other various forms of products under the inspiration of the utility model. The above specific embodiments should not be construed as limiting the protection scope of the utility model. The protection scope of the utility model shall be defined by the claims, and the description can be used to interpret the claims.

Claims

1. The secondary electrical connection structure is arranged in the electrical connector to form a trigger signal feedback to control the conduction / power-off of the electrical connector by connecting / disconnecting at least two electrical connectors. It is characterized in that: It includes a push block (1) corresponding to the movable connection part of the electrical connector and a group of contact pieces, and the contact pieces are connected in series on the signal circuit of the electrical connector; The contact piece includes a movable contact piece (2) and a fixed contact piece (3) in a normally open relationship. The movable contact piece (2) has a movable main contact (12) pushed by the push block (1) to contact the fixed contact piece (3). The fixed contact piece (3) has a receiving portion corresponding to contacting the movable main contact (12) and forming an elastic limiting force by adhering to the movable contact.

2. The secondary power connection structure according to claim 1, wherein: The receiving portion is an opening provided on the fixed contact piece (3) and a shielding member provided at the opening and shielding the end face of the opening. The shielding member is elastically connected to the fixed contact piece (3).

3. The secondary electrical connection structure according to claim 2, wherein: The shielding member is a power connection elastic piece (14). When the movable main contact (12) pushes open the power connection elastic piece (14) and passes through the opening, the power connection elastic piece (14) fits on the surface of the movable main contact (12).

4. The secondary electrical connection structure according to claim 3, characterized in that: It includes two fixed contact pieces (3) connected to the signal circuit. The fixed contact pieces (3) are arranged at intervals and form an opening between the two fixed contact pieces (3). The opening is blocked by two power connection elastic pieces (14) respectively provided on the fixed contact pieces (3). The movable main contact (12) contacts the two power connection elastic pieces (14) simultaneously to connect the two fixed contact pieces (3) to form the connection of the signal circuit.

5. The secondary electrical connection structure according to claim 3, characterized in that: The movable contact piece (2) is provided with a movable secondary contact (13), and the fixed contact piece (3) is provided with a fixed contact (15) arranged at an interval from the movable secondary contact (13) and contacting by abutting.

6. The secondary electrical connection structure according to claim 1, characterized in that: The end of the push block (1) has a sliding groove (16), and the fixed contact piece (3) is connected to a contact piece spring (17) arranged in the sliding groove (16) and elastically slides in the sliding groove (16) through the contact piece spring (17).

7. The secondary electrical connection structure according to claim 1, wherein: It further includes a feedback module (6). The signal line (7) of the signal circuit penetrates into the feedback module (6) and is electrically connected to the contact piece inserted into the feedback module (6).

8. The secondary electrical connection structure according to claim 7, wherein: It further includes an insurance module (8) for detecting the abnormal state of the connected electrical connector. The feedback module (6) in a normally open state and the insurance module (8) in a normally closed state are connected in series on the signal circuit; The abnormal state includes one or more of overheating, overcurrent, overvoltage, overfrequency, short circuit, and leakage.

9. A socket, characterized in that: A secondary electrical connection structure according to any one of the above claims 1-8 is provided, including a housing (10) having a jack and a wiring terminal (4) arranged in the jack. The wiring terminal (4) is connected to an external power supply circuit; The push block (1) has a pushing end, and the projection of the pushing end on the end face of the jack opening has an overlapping area with the jack.

10. A socket according to claim 9, characterized in that: A signal lamp (11) for feeding back the on / off of the signal circuit is further provided in the housing (10), and the housing (10) has an opening exposing the signal lamp (11).

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