Overload protection plug

Abstract

The utility model discloses an overload protection plug, and belongs to the technical field of plugs. The overload protection plug comprises a seat body; the plug pin is arranged on the seat body, an electric contact part is configured on the plug pin, and the plug pin is configured to be connected with an external power supply live wire; the wiring terminal is arranged on the seat body; the bimetallic strip is provided with a fixed end and a free end, the fixed end is electrically connected with the wiring terminal, the free end is separably connected with the electric contact part, and the bimetallic strip deforms during overload, so that the free end is far away from the electric contact part; and the reset piece is movably arranged on the seat body, and the reset piece is connected to the bimetallic strip so as to drive the bimetallic strip to deform, so that the free end is close to the electric contact part. The protection device of the overload protection plug is simple in structure, stable in function and low in cost.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of plugs, and particularly relates to an overload protection plug. BACKGROUND

[0002] Safety in use is an important index of various electric appliances, and therefore an overload protection device is usually arranged in various medium and high-end electric appliances to limit overload damage. The overload protection device is usually a reversible destructive protection device, which is disconnected in the form of deformation to disconnect the electrical connection of the electric appliance to achieve overload protection, and can be reset after the overload factor is removed to achieve repeated use.

[0003] In some electric appliances, in order to improve the convenience of the overload reset operation, the overload protection device can be arranged in a position convenient for operation, such as an operation area of the electric appliance, a plug area, etc. However, the plug area and the like has a small volume, needs to accommodate the plug function structure itself, and also needs to accommodate the reset structure and the overload deformation structure. Under the condition of considering the accommodation, safety and operation space, the layout of the structural components in the plug is too concentrated, the reset structure is complex, the surrounding structure is easily damaged under the overload state, the function stability is not ideal, the overall cost of the overload protection device is high, and the production and assembly efficiency is not ideal. SUMMARY

[0004] The application provides an overload protection plug, which aims to at least solve the technical problems of complex structure and poor function stability of the overload protection device in the electric appliance, and achieve the technical effects of reducing the complexity of the protection device structure, improving the function stability and reducing the cost. To this end,

[0005] The overload protection plug provided by the application comprises:

[0006] a seat body;

[0007] a plug pin arranged on the seat body, wherein the plug pin is provided with an electrical contact portion, and the plug pin is configured to be connected to an external power supply live wire;

[0008] a wiring terminal arranged on the seat body;

[0009] a bimetallic strip having a fixed end and a free end, wherein the fixed end is electrically connected to the wiring terminal, the free end is detachably connected to the electrical contact portion, and the bimetallic strip deforms to move the free end away from the electrical contact portion under overload; and

[0010] a reset member movably arranged on the seat body and connected to the bimetallic strip to drive the bimetallic strip to deform to move the free end to be close to the electrical contact portion.

[0011] In some embodiments, a positioning boss is arranged on the seat body, a positioning hole is arranged on the terminal, and the positioning boss is arranged in the positioning hole.

[0012] In some embodiments, the terminal comprises:

[0013] An adapter contact is arranged on the seat body, and the adapter contact is connected with the fixed end;

[0014] A terminal post is connected on the adapter contact.

[0015] In some embodiments, a displacement window is arranged on the bimetallic strip and penetrates the bimetallic strip along the thickness direction, an extension arm is arranged on the free end and extends to the displacement window, a movable contact is arranged on the extension arm and cooperates with the electrical contact, and the reset member is connected on the extension arm.

[0016] In some embodiments, a spherical surface is arranged between the fixed end and the free end, the concave-convex direction of the spherical surface is arranged along the thickness direction of the bimetallic strip, a movable contact is arranged on the free end and cooperates with the electrical contact, and the reset member is connected on the free end.

[0017] In some embodiments, the seat body comprises:

[0018] A base is arranged with a bolt hole, and the bolt hole is configured to accommodate the bolt;

[0019] A cover is connected on the base, the cover presses the terminal and the fixed end on the base, and the cover is arranged with a guide groove to accommodate and guide the reset member.

[0020] In some embodiments, a spring is connected between the reset member and the cover, and at least part of the elastic force of the spring is configured to keep the reset member overlapped on the free end.

[0021] In some embodiments, a limiting column is arranged on the reset member and embedded in the spring.

[0022] In some embodiments, a reset window is arranged on the cover, and a pressing part is arranged on the reset member and arranged in the reset window.

[0023] In some embodiments, a limiting table is arranged on the base and arranged on the moving track of the reset member to limit the distance between the reset member and the bimetallic strip.

[0024] The embodiments of the present application have at least the following beneficial effects:

[0025] The overload protection plug provided by the embodiments of the present application comprises a seat body, a plug pin, a terminal, a bimetallic strip and a reset member, the plug pin and the terminal are fixed on the seat body, the fixed end of the bimetallic strip is connected to the terminal, and the free end is detachably connected with the electrical contact part of the plug pin, so that the bimetallic strip can deform and disconnect the free end from the electrical contact part when overload occurs; and the reset member is movably arranged on the seat body and connected with the bimetallic strip, so that the bimetallic strip can be driven to reset by the reset member to reconnect the free end with the electrical contact part, so as to restore the conduction state of the plug. It is worth noting that the fixed end of the bimetallic strip is connected to the terminal for external cable, and the free end is connected with the electrical contact part of the plug pin, so that a simple electrical connection and overload circuit breaking structure can be realized, the structural complexity is reduced, the required installation and operation space is reduced to some extent, the cost and the risk of interfering with the surrounding structure during overload are reduced as a whole; on the other hand, considering the limited internal space of the plug, the plug pin connected with the external power supply and the free end of the bimetallic strip are detachably connected, so that after overload circuit breaking, the bimetallic strip will be away from the live structure, so that the electrical equipment connected by the plug is in a reliable power-off state, the safety is maintained, and the safety distance requirement between components is reduced to some extent, so that the overall size specification can be reduced to some extent; and even under the action of random factors such as overload deformation and displacement of the bimetallic strip, other plug pins, wires and other conductive structures connected in the plug will not be electrically connected, so that the risk of short circuit and electric shock is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Figure 1 An explosion view of the first structure of the overload protection plug in the embodiments of the present application is shown;

[0028] Figure 2 An assembly state schematic view of the overload protection plug in Figure 1 is shown;

[0029] Figure 3 An arrangement position schematic view of the reset member of the overload protection plug in Figure 1 is shown;

[0030] Figure 4 A first cooperation state schematic view of the reset member and the spring of the overload protection plug in Figure 1 is shown;

[0031] Figure 5 It shows Figure 1 A schematic diagram of the second engagement state between the reset component and the spring of the overload protection plug;

[0032] Figure 6 It shows Figure 1 A schematic diagram of the overload protection plug's cover structure;

[0033] Figure 7 It shows Figure 1 A cross-sectional view of the overload protection plug in its conduction state;

[0034] Figure 8 It shows Figure 1 A partial cross-sectional view of the overload protection plug in its on-state.

[0035] Figure 9 It shows Figure 1 A cross-sectional view of the overload protection plug in overload breakage state;

[0036] Figure 10 It shows Figure 1 A partial cross-sectional view of the overload protection plug in the overload disconnection state;

[0037] Figure 11 It shows Figure 1 A schematic diagram of the packaging state of the overload protection plug in the middle;

[0038] Figure 12 An exploded view of a second structure of the overload protection plug in an embodiment of this application is shown;

[0039] Figure 13 It shows Figure 12 A schematic diagram of the assembly status of the overload protection plug;

[0040] Figure 14 It shows Figure 12 A schematic diagram showing the arrangement of the reset component of the overload protection plug;

[0041] Figure 15 It shows Figure 12 A schematic diagram of the first engagement state between the reset component and the spring of the overload protection plug;

[0042] Figure 16 It shows Figure 12 A schematic diagram of the second engagement state between the reset component and the spring of the overload protection plug;

[0043] Figure 17 It shows Figure 12 A schematic diagram of the overload protection plug's cover structure;

[0044] Figure 18a cross-sectional view of the on-state of the overload protection plug in Figure 12

[0045] Figure 19 a cross-sectional view of the on-state of the overload protection plug in Figure 12

[0046] Figure 20 a cross-sectional view of the overload protection plug in Figure 12

[0047] Figure 21 a cross-sectional view of the overload protection plug in Figure 12

[0048] Figure 22 a cross-sectional view of the overload protection plug in Figure 1 DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0050] In addition, reference numbers and / or reference letters can be repeated in different examples in the present application, and such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but a person of ordinary skill in the art can realize the application of other processes and / or the use of other materials.

[0051] The present application will be described below in conjunction with the drawings and with reference to specific embodiments:

[0052] The overload protection device is arranged on the plug, which can balance the overload protection function and the convenient reset operation. However, the volume of the plug is small, and a plurality of pins and the overload protection assembly need to be accommodated, and the size specification of the plug is set standard, and the installation volume is limited, which makes it difficult to strictly control the installation position, the action area and the structure volume when planning to install various functional assemblies on the plug, and the risk of interference between structures is high, and the functional reliability and the electrical safety are not ideal.

[0053] Therefore, the overload protection plug of the present application aims to reduce the complexity and the overall volume of the functional structure in the overload protection plug to a certain extent, reduce the interference risk between the overload protection structure and the surrounding structure, and improve the overall functional reliability and electrical safety.​​​​​

[0054] Referring to Figure 2 、 Figure 12 、 Figure 13 and Figure 1 In some embodiments, the overload protection plug can include a seat body 1 and a plug pin 2, a terminal 3, a bimetallic strip 4 and a reset member 5 arranged in the seat body 1, the fixed end of the bimetallic strip 4 is connected with the terminal 3, the free end of the bimetallic strip 4 is detachably connected with the electrical contact part 21 of the plug pin 2, and the reset member 5 is connected on the free end of the bimetallic strip 4 to drive the free end of the bimetallic strip 4 to reset and connect to the electrical contact part 21.

[0055] The seat body 1 is the overall frame and mounting base of the overload protection plug, which constrains and fixes each functional component to keep its shape and position stable and can be held and plugged into the socket.

[0056] The plug pin 2 is configured to connect the live wire end of the external power supply, and the plug pin 2 is provided with an electrical contact part 21 for detachable electrical connection with the bimetallic strip 4 on the seat body 1; after overload tripping, the bimetallic strip 4 disconnects the connection with the electrical contact part 21.

[0057] The terminal 3 is configured to connect the conductive member such as wire in the electrical appliance, and can connect the wire when the overload protection plug is assembled. In addition, the terminal 3 is also fixedly connected with the bimetallic strip 4.

[0058] The bimetallic strip 4 is configured as an overload deformation device, the fixed end 41 of the bimetallic strip 4 is fixedly connected with the terminal 3, and the free end 42 of the bimetallic strip 4 is detachably connected with the electrical contact part 21 of the plug pin 2, so that when the bimetallic strip 4 is overloaded, the bimetallic strip 4 deforms, the free end 42 moves away from the electrical contact part 21, the electrical connection between the plug pin 2 and the terminal 3 and the internal structure of the electrical appliance is disconnected, and overload tripping protection is realized.

[0059] It is worth noting that since the electrical contact part 21 of the plug pin 2 is detachably connected with the free end 42 of the bimetallic strip 4, all the conductive members in the seat body 1 except the plug pin 2 are in a non-charged state when overloaded, the safety is greatly improved, and even if the bimetallic strip 4 contacts other conductive members, it will not be electrically conducted, thereby further reducing the risk of electrical safety.

[0060] The reset member 5 is configured to drive the bimetallic strip 4 to reset after displacement due to overload deformation, is movably arranged on the seat body 1, can follow the displacement of the bimetallic strip 4 when the bimetallic strip 4 is displaced due to overload deformation, and can drive the bimetallic strip 4 to reset when it is necessary to reset the bimetallic strip 4, so that the free end 42 restores contact with the electrical contact part 21, and the plug 2 and the terminal 3 are connected in conduction.

[0061] The overload protection plug provided by the embodiment of the application comprises a seat body, a plug, a terminal, a bimetallic strip, and a reset member. The plug and the terminal are fixed on the seat body. The fixed end of the bimetallic strip is connected to the terminal, and the free end is detachably connected to the electrical contact part of the plug, so that the bimetallic strip can be deformed to disconnect the free end from the electrical contact part when an overload occurs. The reset member is movably arranged on the seat body and connected to the bimetallic strip, so that the bimetallic strip can be driven to reset by the reset member to reconnect the free end to the electrical contact part, thereby restoring the conduction state of the plug. It is worth noting that the fixed end of the bimetallic strip is connected to the terminal for external cable connection, and the free end is connected to the electrical contact part of the plug, so that a simple electrical connection and overload disconnection structure can be achieved, the structural complexity is reduced, the required installation and operation space is reduced to some extent, the overall cost and the risk of interfering with the surrounding structure during overload are reduced, on the one hand. On the other hand, considering the limited space inside the plug, the plug connected to the external power supply and the free end of the bimetallic strip are detachably connected, so that the bimetallic strip is away from the live structure after overload disconnection, so that the electrical equipment connected by the plug is in a reliable power-off state, the safety is maintained, and the safety distance requirement between components is reduced to some extent, so that the overall size can be reduced to some extent. Even under the action of random factors such as overload deformation displacement of the bimetallic strip, other plug-in structures such as other plug-in structures, wires, and other conductive structures inside the plug will not be in conduction, thereby greatly reducing the risk of short circuit and electric shock.

[0062] Referring to Figure 8 , Figure 10 and Figure 1 , in some embodiments, considering that the installation space on the seat body 1 is limited, and the bimetallic strip 4 and the plug 2 need to be stably matched, the position of the bimetallic strip 4 needs to be strictly controlled and the installation position needs to be kept stable during assembly.

[0063] Therefore, a positioning boss 111 can be arranged on the seat body 1, and a positioning hole 311 can be formed on the terminal 3, and the positioning boss 111 and the positioning hole 311 can be stably nested, that is, the positioning boss 111 can be matched and embedded in the positioning hole 311, so that the bimetallic strip 4 can be stably fixed at a specified position of the seat body 1.

[0064] Generally, the number of the positioning bosses 111 and the positioning holes 311 can be set to two respectively to improve the positioning and limiting performance.

[0065] Referring to Figure 3 In some embodiments, considering that the bimetallic strip 4 is in a sheet structure, in order to adapt to the connection of the terminal 3, the terminal 3 can include a contact sheet 31 and a terminal post 32; the contact sheet 31 is connected with the fixed end 41 of the bimetallic strip 4, and the terminal post 32 is connected on the contact sheet 31.

[0066] Generally, the contact sheet 31 can adopt a surface-to-surface contact connection mode with the fixed end 41 of the bimetallic strip 4 to maintain sufficient contact area and ensure the reliability of electrical connection.

[0067] The positioning hole 311 can also be arranged on the contact sheet 31, and when assembling, the contact sheet 31 can be placed on the seat body 1 by corresponding to the positioning boss 111, which is convenient to operate and accurate in positioning.

[0068] The terminal post 32 can be directly formed on the contact sheet 31, and the terminal post 32 is provided with a gap for accommodating a wire to facilitate riveting.

[0069] Referring to Figure 4 , Figure 5 , Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 1 In some embodiments, the bimetallic strip 4 can be pressed by two different efficiency thermal deformation metal materials, so that when the bimetallic strip 4 is overloaded, the amplitude and efficiency of thermal deformation are different, so that the bimetallic strip 4 appears deformation and bending, and since the fixed end 41 is fixed on the seat body 1, the position is stable, so that the free end 42 appears a certain amplitude of displacement, thereby breaking the connection with the electrical contact part 21 of the latch 2.

[0070] Generally, the deformation direction of the bimetallic strip 4 can be one side of the two side surfaces of the sheet structure, and the reset direction is the reverse direction of the deformation direction, which has stable deformation and reset directions, thereby being able to guarantee the reliability of overload tripping and reset conduction.

[0071] Correspondingly, the moving direction of the reset member 5 matches the deformation and moving direction of the free end 42 of the bimetallic strip 4, so that the reset member 5 can move with the free end 42 and can move the reset member 5 reversely to reset the free end 42.

[0072] In some embodiments, the reset member 5 can be lapped on one side of the deformed upturned free end 42, so that when the bimetallic strip 4 is overloaded and deformed, the reset member 5 is pushed away from the bimetallic strip 4, and when reset, the free end 42 of the bimetallic strip 4 is forced to reset by pressing the reset member 5, thereby bringing the bimetallic strip 4 as a whole to reset.

[0073] Referring to Figure 3 , Figure 4 , Figure 5 and Figure 12 , in some embodiments, considering that the bimetallic strip 4 has a certain length, in order to improve the displacement sensitivity of the free end 42 in a limited space, that is, to improve the reliability of the overload action, a moving window 43 can be opened on the bimetallic strip 4 along the thickness square and extending to the area where the moving window 43 is located, and an extension arm 421 is arranged at the free end 42, the end of the extension arm 421 is provided with a movable contact 422 adapted to the electrical contact 21, and the extension arm extends to the area where the moving window 43 is located, so that during the deformation of the bimetallic strip 4, the free end 42 follows the displacement, so that the extension arm 421 and the movable contact 422 move on both sides of the bimetallic strip 4 through the moving window 43, thereby disconnecting or connecting the electrical contact 21.

[0074] In some embodiments, in order to facilitate the improvement of the efficiency of the reset operation, the reset member 5 can be directly connected to the extension arm 421.

[0075] In some embodiments, the extension arm 421 can be oblique to the plate surface on both sides of the bimetallic strip 4, which can amplify the displacement amplitude of the movable contact 422 to some extent, so that even if the deformation amplitude of the bimetallic strip 4 is small, it can also have better overload response sensitivity.

[0076] Generally, the included angle between the extension arm 421 and the plate surface on the side where it is located can be obtuse, such as 120-150 degrees.

[0077] It is worth noting that due to the opening of the moving window 43, the material in the peripheral area is relatively less and is more prone to deformation, which can further amplify the displacement angle of the deformed extension arm 421.

[0078] In some embodiments, the movable contact 422 can be directly riveted to the end of the extension arm 421 using independent copper contacts, silver contacts, etc.

[0079] Similarly, the electrical contact 21 of the plug-in pin 2 can also be riveted with independent copper contacts, silver contacts, as static contacts 211, which are in contact with the movable contact 422 for electrical conduction to improve the reliability of electrical contact.

[0080] Referring toFigure 14 、 Figure 16 、 Figure 17 、 Figure 18 、 Figure 19 、 Figure 20 、 Figure 21 and Figure 1 In some embodiments, the movable contact 422 can also be directly arranged at the free end 42, but in order to improve the overload deformation efficiency and sensitivity, a spherical portion 44 can be arranged between the fixed end 41 and the free end 42, that is, the part of the plate body between the fixed end 41 and the free end 42 is arranged in a concave-convex shape along the thickness direction, one side is concave and the other side is convex, which is roughly spherical, so that when the overload deformation occurs, the spherical portion 44 can switch the concave-convex direction, so that the free end 42 can be displaced by a certain amplitude and keep the position after displacement, thereby ensuring the reliability of the overload circuit protection.

[0081] It is worth noting that since the curvature of the spherical portion 44 is obviously larger than that of the other regions of the bimetallic strip 4, the deformation amplitude of the spherical portion 44 is of course larger when the overload occurs, thereby amplifying the displacement amplitude of the free end 42, making the overload circuit response more sensitive.

[0082] In some embodiments, the fixed end 41 can also be welded or riveted on the contact patch 31.

[0083] Referring to Figure 3 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 12 、 Figure 14 、 Figure 17 、 Figure 18 、 Figure 19 、 Figure 20 、 Figure 21 and Figure 1 In some embodiments, the seat body 1 can adopt an injection molding method or a multi-shell buckling method to form a frame structure of a specific cavity.

[0084] Generally, the seat body 1 can include a base 11 and a gland 12, and the gland 12 is fixed on the base 11 to form a cavity to accommodate the overload function structure and the reset function structure.

[0085] Specifically, the base 11 is a bearing base, the plug 2 and the terminal 3 can be directly fixed on the base 11, and the bimetallic strip 4 can be directly fixed on the terminal 3 and indirectly fixed on the base 1. The cover 12 is provided with a guide groove 121 for accommodating the reset member 5, and the reset member 5 is movably arranged in the guide groove 121.

[0086] In some embodiments, a reset window 122 can be formed on the cover 12, and a part of the body of the reset member 5 serves as a pressing part 53, which is movably arranged in the reset window 122 and exposed outside the cover 12, thereby facilitating the pressing operation of the reset member 5.

[0087] In some embodiments, in order to balance the convenience of pressing operation and the positioning and guiding performance of the reset member 5, the pressing part 53 can be provided as a pressing column 531 with a certain length, one end of the pressing column 531 is fixed on the body of the reset member 5, and the other end is movably arranged through the reset window 122 and exposed to the reset window 122, thereby facilitating the pressing operation.

[0088] Referring to Figure 2 , Figure 4 , Figure 5 , Figure 12 , Figure 13 , Figure 15 , Figure 16 and Figure 4 , in some embodiments, the reset member 5 is lapped on the free end 42 or the extension arm 421, and can only be positioned on one side, which is easy to swing and cause abnormal noise; a spring 51 can be arranged between the reset member 5 and the cover 12, and the deformation direction of the spring 51 can be arranged along the moving direction of the reset member 5, thereby being able to buffer and absorb the moving impact of the reset member 5, or maintaining a certain degree of elastic force to form the moving resistance of the reset member 5, so that the reset member 5 is always lapped on the free end 42.

[0089] That is, the spring 51 has elastic deformation ability and maintains external elastic force, at least part of which can keep the reset member 5 and the free end 42 or the extension arm 421 in the lapped state.

[0090] Referring to Figure 15 and Figure 5 , in some embodiments, the spring 51 can be configured as a spiral spring, and a limiting column 52 is arranged on the reset member 5, and the spring 51 is sleeved outside the limiting column 52, so that the deformation direction of the spring 51 is mainly kept in the axial direction, thereby ensuring the stability of the elastic force.

[0091] In the assembly, the two ends of the spring 51 abut against the reset member 5 and the gland 12 respectively.

[0092] Referring to Figure 16 and Figure 1 In other embodiments, the spring 51 is configured as a barrel-shaped spring, and can be directly sleeved on the pressing column 531, and abut against the main body of the reset member 5 and the gland 12.

[0093] Referring to Figure 8 、 Figure 10 、 Figure 12 、 Figure 19 、 Figure 21 and Figure 12 In some embodiments, in order to avoid the force of the spring 51 being too inaccurate to affect the overload deformation displacement of the free end 42 and the extension arm 421 and the feasibility of the reset operation, the limiting table 112 can be arranged on the base 11 and arranged on the movement track of the reset member 5 for stopping the reset member 5 from excessively approaching the base 11; that is, when the reset member 5 approaches the base 11, the track endpoint is the position of the limiting boss 112.

[0094] Specifically, the position of the limiting table 112 is arranged such that when the overload deformation displacement of the free end 42 and the extension arm 421 pushes, the reset member 5 can be pushed; and in the reset operation, the reset member 5 has enough stroke to push the bimetallic strip 4 to reset.

[0095] Generally, the height of the limiting table 112 can be matched with the displacement height of the free end 42 and the extension arm 421, and the stopping position of the limiting table 112 is approximately level with the position of the bimetallic strip 4 in the normal state.

[0096] In some embodiments, the reset member 5 can be arranged as a long strip-shaped block, and the length thereof can be greater than or equal to the width of the free end 42 or the extension arm 421, that is, the reset member 5 can completely cover the stress area.

[0097] Referring to Figure 14 、 Figure 15 、 Figure 16 and Figure 1 In some embodiments, the movable contact 422 is arranged on the free end 42, and in order to maintain the reliability of the electrical connection due to local stress, a pushing boss 54 can be arranged on the side of the reset member 5 facing the bimetallic strip 4, the pushing boss 54 abuts against the movable contact 422, and the spring 51 is used to stably press the movable contact 422 on the electrical contact 21 by the elastic force.

[0098] Referring to Figure 6 , Figure 7 , Figure 11 , Figure 12 , Figure 17 , Figure 18 , Figure 22 and Figure 6 , in some embodiments, in order to facilitate the positioning and installation of the cover 12, a locking hole 113 can be formed on the base 11, and a locking post 123 is arranged on the cover 12, which is embedded in the locking hole 113.

[0099] Generally, the locking post 123 and the locking hole 113 are in pairs, so as to stably position and fix the cover 12. Usually, after the cover 12 is assembled, an outer layer 13 is injected on the base 11 and the cover 12 by using an injection molding process, so as to improve the integrity of the plug.

[0100] Of course, the plug-in pin 2 is also embedded in the base 1, and is reinforced and fixed by injection molding.

[0101] The terminal post 32 is also connected with the conductive member such as the internal wire before being encapsulated by injection molding.

[0102] Referring to Figure 7 , Figure 9 , Figure 17 , Figure 18 , Figure 20 and Figure 1 , in some embodiments, the fixing end 41 of the terminal 3 and the bimetallic strip 4 can be stacked, and then pressed on the base 11 by the cover 12, so as to simplify the connection operation of the terminal 3 and the bimetallic strip 4 to a certain extent.

[0103] In some embodiments, in order to further strengthen the pressing effect of the cover 12 on the fixing end 41 and then the contact patch 31, a pressing boss 124 can be arranged in the cover 12, which corresponds to the fixing end 41 of the bimetallic strip 4 and the contact patch 31.

[0104] The pressing boss 124 can be multiple, which are arranged at multiple regions of the fixing end 41, such as the middle part and the two side parts.

[0105] Usually, the bimetallic strip 4 and the contact patch 31 can be protected in the cover 12, and the terminal post 32 is left outside the cover 12.

[0106] Referring to Figure 8 , Figure 10 , Figure 12 , Figure 19 ,Figure 21 And ​ In some embodiments, in consideration of the bimetallic strip 4 will be curved deformation in the thickness direction, in order to avoid interference with the base 11, a support boss 114 can be provided on the base 11, the bimetallic strip 4 is supported at a certain height from the base 11, leaving a deformation gap.

[0107] In some embodiments, the plug is also generally configured with a zero line plug, a ground line plug, which can be fixed on the base 11, and are connected to the connection post in separate columns.

[0108] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0109] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0110] It should be noted that all directional indications, e.g., "upper," "lower," "front," "back," "side," "end," "upper," "lower," "up," "down," "clockwise," "counter clockwise," "first," "second," "third," "top," "bottom," "horizontal," "vertical," "left," "right," "indicate relative positions and orientations of the components, movements, etc. in a particular position, and if the particular position changes, the directional indications will also change accordingly. In this application, unless specifically stated and limited otherwise, the terms "connect," "fixed," and the like, should be given their broadest meaning, for example, "fixed" can be fixed connections, or detachable connections, or integral; can be mechanical or electrical connections; can be direct or indirect connections, or two elements internal communication or interaction between the two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances. In addition, the description in this application such as "first", "second", etc. is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0111] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present application.

[0112] In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the scope of protection claimed by the present application.

[0113] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and deformations can be made to these embodiments without departing from the principles and purposes of the present application, the scope of the present application is defined by the claims and their equivalents.

Claims

1. An overload protection plug, characterized in that The utility model relates to a plug-in connector, comprising: a seat body; a plug pin arranged on the seat body, the plug pin being provided with an electrical contact part, and the plug pin being configured to be connected to a live wire of an external power supply; a terminal arranged on the seat body; a bimetallic strip having a fixed end and a free end, the fixed end being electrically connected to the terminal, the free end being detachably connected to the electrical contact part, and the bimetallic strip being deformed when an overload occurs, so that the free end moves away from the electrical contact part; a reset member movably arranged on the seat body and connected to the bimetallic strip to drive the bimetallic strip to deform, so that the free end moves towards the electrical contact part. The seat body is provided with a positioning boss, and the terminal is provided with a positioning hole, the positioning boss being arranged in the positioning hole.

2. The overload protection plug of claim 1, wherein, The terminal comprises:

3. The overload protection plug of claim 1, wherein, a contact piece arranged on the seat body and connected to the fixed end; a terminal post connected to the contact piece. The bimetallic strip is provided with a displacement window penetrating the bimetallic strip along the thickness direction, the free end is provided with an extension arm extending into the displacement window, the extension arm is provided with a movable contact point matched with the electrical contact part, and the reset member is connected to the extension arm.

4. The overload protection plug of claim 1, wherein, The region between the fixed end and the free end is provided with a spherical surface part, the concave-convex direction of the spherical surface part being arranged along the thickness direction of the bimetallic strip, the free end being provided with a movable contact point matched with the electrical contact part, and the reset member being connected to the free end.

5. The overload protection plug of claim 1, wherein, The seat body comprises:

6. An overload protection plug according to any one of claims 1 to 5, wherein a base provided with a plug pin hole configured to accommodate the plug pin; a gland connected to the base, the gland pressing the terminal and the fixed end against the base, and the gland being provided with a guide groove accommodating the reset member. The reset member and the gland are connected by a spring, and at least part of the elastic force of the spring is configured to keep the reset member overlapped with the free end.

7. The overload protection plug of claim 6, wherein, The reset member is provided with a limiting column embedded in the spring.

8. The overload protection plug of claim 7, wherein, The gland is provided with a reset window, and the reset member is provided with a pressing part arranged in the reset window.

9. The overload protection plug of claim 6, wherein, The base is provided with a limiting table arranged on the moving track of the reset member to limit the distance between the reset member and the bimetallic strip.

10. The overload protection plug of claim 6, wherein, ​

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