Overload protection plug

Abstract

The overload protection plug comprises an outer shell and an inner shell, the outer shell and the inner shell are provided with reset holes, the inner shell is provided with a movable piece, an elastic piece, a bimetallic strip, a contact piece and a first plug, the bimetallic strip is arranged between the first plug and the contact piece, the other end, connected with the first plug, of the bimetallic strip is provided with a movable contact part, and the contact piece is provided with a static contact part corresponding to the movable contact part; or one end of the bimetallic strip is connected with the contact piece, the other end is provided with a movable contact part, and the first plug is provided with a static contact part corresponding to the movable contact part; the elastic piece is connected with the movable piece; the movable piece is provided with a pressing part and an isolating part; when the bimetallic strip is heated and deformed to separate the movable contact part from the static contact part, the elastic piece drives the movable piece to move, so that the pressing part extends out of the reset hole, and the isolation part extends between the movable contact part and the static contact part; the pressing part is stressed to enable the isolation part to move out of the space between the movable contact part and the static contact part, and the movable piece is limited and enables the elastic piece to store energy. The assembly is simple, and the safety performance is good.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to an overload protection plug. Background Technology

[0002] With increasing public awareness of electrical safety, and with national standards imposing new requirements for overload protection functions on electrical accessories, and given the prevalence of high-power appliances, multi-socket electrical accessories pose a risk of exceeding power limits when multiple appliances are used simultaneously. Existing overload protection products add overload protection devices to the socket, which provides overload protection but fails to protect the cable portion, posing a potential safety hazard. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an overload protection plug that is installed inside the plug.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This application provides an overload protection plug, including a housing with a reset hole and at least two plug holes. An inner housing is also provided inside the housing. The inner housing contains a movable component, an elastic component, a bimetallic strip, a contact piece, and a first plug. The bimetallic strip is disposed between the first plug and the contact piece, with one end connected to the first plug and the other end having a movable contact portion. The contact piece has a static contact portion corresponding to the movable contact portion; alternatively, one end of the bimetallic strip is connected to the contact piece, and the other end has a movable contact portion, with the first plug having a static contact portion corresponding to the movable contact portion. The inner housing has a second reset hole corresponding to the reset hole. The elastic component is connected to the movable component, and the movable component has a pressing portion and an isolating portion.

[0006] When the bimetallic strip deforms due to heat, causing the moving contact part to separate from the stationary contact part, the elastic element drives the moving part to move, causing the pressing part to extend out of the reset hole, and the isolation part to extend between the moving contact part and the stationary contact part;

[0007] The pressing part, when subjected to force, can move the isolating part out of the space between the moving contact part and the stationary contact part, and the moving part is limited and the elastic part stores energy.

[0008] In one possible implementation, the first plug is disposed along a first direction, the elastic element drives the movable element to extend and retract along a second direction, and the contact piece is disposed along the second direction, wherein the direction in which the first plug is inserted into the socket is the first direction, and the first direction is perpendicular to the second direction.

[0009] In one possible implementation, the movable member has a cylindrical structure at one end with a pressing part, which slides in conjunction with the second reset hole. The isolation part is a plate-like structure that extends from one side of the other end of the movable member. A groove is provided in the middle of the movable member, and the elastic element is partially placed in the groove.

[0010] In one possible implementation, the contact piece includes a first cable mounting portion extending out of the inner housing, the first cable mounting portion being located between the outer housing and the inner housing, and a first plug extending out of the inner housing and from a plug hole in the outer housing; the inner housing also provides at least one second plug extending out of the inner housing and from a plug hole in the outer housing, and the second plug having a second cable mounting portion extending out of the inner housing, the second cable mounting portion being located between the outer housing and the inner housing.

[0011] In one possible implementation, the inner shell has a plug hole, from which a first plug detachably extends, and a second plug is integrally injection molded with the inner shell.

[0012] In one possible implementation, at least one cable limiting groove is provided on the outer side of the inner shell, and the cable limiting groove is located inside the outer shell.

[0013] In one possible implementation, the overload protection plug is a three-prong plug, further comprising a second plug and a third plug, the second plug and the third plug being integrally injection molded with the inner shell, the inner shell having a plug hole for detachably installing the first plug;

[0014] The first plug includes a first plug body, a first connecting plate, and a second connecting plate that are integrally cast and sequentially bent and connected; the second plug includes a second plug body and a second cable connecting plate that are integrally cast and bent and connected; the third plug includes a third plug body and a third cable connecting plate that are integrally cast and bent and connected.

[0015] The contact piece includes a first cable mounting portion extending out of the inner shell, and the second cable connecting plate and the third cable connecting plate respectively include a second cable mounting portion and a third cable mounting portion extending out of the inner shell. The first cable mounting portion, the second cable mounting portion and the third cable mounting portion are located between the outer shell and the inner shell.

[0016] In one possible implementation, the angle between the plane containing the first plug body and the plane containing the first connecting plate is °, the angle between the plane containing the first connecting plate and the plane containing the second connecting plate is °, the angle between the plane containing the second plug body and the plane containing the second cable connecting plate is °, and the angle between the plane containing the third plug body and the plane containing the third cable connecting plate is °.

[0017] In one possible implementation, the first cable mounting portion, the second cable mounting portion, and the third cable mounting portion have a hole-like structure.

[0018] In one possible implementation, the cable limiting groove protrudes from the outside of the inner shell, forming a barb structure, the opening direction of which is opposite to the direction in which the overload protection plug is inserted into the socket.

[0019] In one possible implementation, the middle portion of the first plug and the middle portion of the second plug are recessed areas, and the recessed areas are provided with overmolding process holes; the two sides opposite to the recessed areas of the first plug and the two sides opposite to the recessed areas of the second plug are provided with raised and recessed textures; the recessed areas of the first plug and the recessed areas of the second plug are provided with insulating rubber.

[0020] In one possible implementation, the insulating rubber of the second plug is integrally injection molded with the inner shell, extending from the inner shell toward the socket toward the direction in which the plug is inserted into the socket.

[0021] In one possible implementation, the inner shell includes a cover plate and a base, the cover plate covering the base, the base having a first fixing part, and the cover plate having a second fixing part, the cover plate and the base being fixedly installed by the first fixing part and the second fixing part cooperating.

[0022] In one possible implementation, the first fixing part is an ultrasonic welding groove opened on the four sides of the base relative to the cover plate side, and the second fixing part is a correspondingly provided ultrasonic welding boss.

[0023] Compared with the prior art, the overload protection plug of this application can improve the insulation protection performance by setting an inner shell inside the outer shell. The inner shell integrates a moving part, an elastic part, a first plug, a bimetallic strip and a stationary contact piece. The bimetallic strip is set between the first plug and the stationary contact piece. A moving contact part and a stationary contact part are arranged opposite to each other between the bimetallic strip and the first plug or the stationary contact piece. When the current is too large or the temperature is too high, the bimetallic strip bends and deforms, causing the oppositely arranged moving contact part and stationary contact part to separate and disconnect the circuit.

[0024] The movable part is connected to the elastic element, allowing the top of the movable part to extend and retract relative to the reset hole. An isolation part is provided at the bottom of the movable part, extending between the moving and stationary contact parts. This isolation part, with the extension and retraction of the movable part, isolates or moves away from the moving and stationary contact parts. The isolation part extending between the moving and stationary contact parts serves to cut off the electric arc and prevent its combustion, while also providing safety protection. The movable part, elastic element, first plug, bimetallic strip, and stationary contact piece occupy a small space within the inner shell. Furthermore, the product is simple to assemble, has fewer parts, and improves production efficiency and safety performance. This invention, by placing the overload protection component inside the plug, effectively protects the product from overload conditions at the current input end, protecting both the socket and the cable, thus enhancing safety.

[0025] Furthermore, the first plug is in the first direction, the elastic element drives the movable element to extend and retract in the second direction, the contact piece is in the second direction, the first direction is perpendicular to the second direction, after the overload protection plug of this application is installed on the socket, the isolation part of the movable element is at the bottom end, and the other end is the pressing part, which is at the top of the movable element and can extend out of the inner shell. At this time, the second direction is perpendicular to the ground. The pressing part is set at the top of the movable element, which facilitates pressing operation and also facilitates observation of whether an overload open circuit occurs.

[0026] Furthermore, the bent structural design of the first, second, and third plugs allows the second and third plugs to be integrally injection molded and embedded inside the inner shell, enhancing the plug's sealing and insulation properties and improving production efficiency. Simultaneously, the bent design allows the first, second, and third cable mounting sections to extend outside the inner shell for wiring.

[0027] Furthermore, a thinning process is performed around the middle of the first plug and the middle of the second plug to form a recessed area for installing insulating rubber to form an insulating sheath. At the same time, a rubber-coating process hole is opened in the recessed area to fix the rubber. Raised and recessed textures are set on the opposite sides of the recessed area to increase the friction between the rubber and the first and second plugs.

[0028] Furthermore, the insulating rubber of the second plug is integrally injection molded with the inner shell. The insulating rubber of the second plug extends from the inner shell toward the socket towards the direction in which the plug is inserted into the socket. By adopting integral injection molding, time is saved, production efficiency is improved, and the insulation effect is better.

[0029] Furthermore, by setting ultrasonic welding grooves on the edge of the base and corresponding ultrasonic welding bosses on the cover plate, the base and cover plate are fixedly installed through ultrasonic welding process, which enhances the sealing performance of the inner shell and improves the insulation effect. Attached Figure Description

[0030] Figure 1 and Figure 2 This is a schematic diagram of the overall structure of the overload protection plug of this utility model;

[0031] Figure 3 This is an exploded view of the overload protection plug of this utility model;

[0032] Figure 4 , Figure 5 and Figure 6 This is a schematic diagram of the overload protection component of this utility model;

[0033] Figure 7 This is a schematic diagram of the structure of the present invention, showing the inner shell integrally injection molded with the second and third plugs;

[0034] Figure 8 This is a schematic diagram of the structure of the bimetallic strip and the first plug fixedly installed in this utility model;

[0035] Figure 9 This is a schematic diagram of the structure of the first plug of this utility model;

[0036] Figure 10 This is a schematic diagram of the structure of the second plug of this utility model;

[0037] Figure 11 This is a schematic diagram of the structure of the third plug of this utility model;

[0038] Figure 12 This is a schematic diagram of the structure after the inner shell, cables, and plugs are installed;

[0039] Figure 13 This is a schematic diagram of the structure after the inner shell and plug are installed;

[0040] Figure 14 This is a structural schematic diagram of the inner shell (without a plug) of this utility model;

[0041] Figure 15 This is a schematic diagram of the structure of the base of this utility model;

[0042] Figure 16 This is a schematic diagram of the structure of the cover plate of this utility model;

[0043] The reference numerals in the attached drawings include: first plug 1; bimetallic strip 2; contact piece 3; moving contact 21; stationary contact 31; outer shell 9; second reset hole 01; moving part 4; elastic part 5; isolation part 41; pressing part 42; groove 43; limiting boss 44; first cable mounting part 32; second plug 03; second cable mounting part 033; third plug 04; cable limiting groove 6; third cable mounting part 043; first plug body 11; first connecting plate 12; second connecting plate 13; second plug body 031; second cable connecting plate 032; third plug body 041; third cable connecting plate 042; recessed area 7; 71 fixing rubber; cover plate 81; base 82; first fixing part 84; second fixing part 85; plug limiting post 83. Detailed Implementation

[0044] The specific embodiments of this utility model are further described below with reference to the accompanying drawings. The scope of protection of this utility model is not limited to the description of the following embodiments.

[0045] like Figures 1 to 7 As shown, this utility model provides an overload protection plug, including a housing with a reset hole and at least two plug holes. An inner housing is provided inside the housing, and the inner housing is provided with an overload protection assembly. The overload protection assembly includes an operating component, a first plug 1, a bimetallic strip 2, and a contact piece 3. The bimetallic strip 2 is disposed between the first plug 1 and the contact piece 3, with one end connected to the first plug 1 and the other end having a moving contact portion 21. The contact piece 3 has a stationary contact portion 31 corresponding to the moving contact portion 21; or, one end of the bimetallic strip 2 is connected to the contact piece 3, and the other end has a moving contact portion 21, with the first plug 1 having a stationary contact portion 31 corresponding to the moving contact portion 21. The inner housing also includes a second reset hole 01 corresponding to the reset hole on the housing 9.

[0046] The operating component includes a movable part 4 and an elastic part 5. The movable part 4 is made of insulating material. The elastic part 5 is connected to the movable part 4. One end of the movable part 4 is provided with an isolation part 41, and the other end is a pressing part 42. The elastic part 5 can make the pressing part 42 of the movable part 4 extend and retract relative to the reset hole. The isolation part 41 isolates or moves away from the moving contact part 21 and the stationary contact part 31 with the extension and retraction movement of the movable part 4.

[0047] When the bimetallic strip 2 deforms due to heat, causing the moving contact 21 to separate from the stationary contact 31, the elastic element 5 can drive the movable element 4 to move, causing the pressing part 42 of the movable element 4 to extend out of the reset hole. At this time, the isolating part 41 extends between the moving contact 21 and the stationary contact 31. The pressing part 42 is subjected to force, which can move the isolating part 41 out between the moving contact 21 and the stationary contact 31, and the movable element 4 is limited and the elastic element 5 stores energy.

[0048] Preferably, the length side of the first plug 1 is set along the first direction, and the elastic member 5 drives the movable member 4 to extend and retract along the second direction. In this embodiment, the contact piece 3 is a long plate-shaped structure with its length side set along the second direction. The direction in which the first plug 1 is inserted into the socket is the first direction, which is perpendicular to the second direction. After the overload protection plug of this application is installed on the socket, the isolation part 41 of the movable member 4 is at the bottom, and the other end is the pressing part 42, which is at the top of the movable member 4 and can extend out of the inner shell. At this time, the second direction is perpendicular to the ground. The pressing part 42 is set at the top of the movable member 4, which facilitates pressing operation and also facilitates observation of whether an overload open circuit occurs.

[0049] in, Figure 1 and Figure 2 This is a schematic diagram of the overall structure of the overload protection plug of this utility model. Figure 3 This is an exploded view of the overload protection plug of this utility model. Figure 4 , Figure 5 and Figure 6 This is a schematic diagram of the overload protection component of this utility model. Figure 7 This is a schematic diagram of the inner shell shown.

[0050] This application uses a bimetallic strip 2 installed between the first plug 1 and the contact piece 3 because the bimetallic strip 2 has special properties. The bimetallic strip 2 will heat up according to the magnitude of the current flowing through it. After heating up, the bimetallic strip 2 itself will deform and spring open, causing the circuit to break at the moving contact 21 and the stationary contact 31. When the bimetallic strip 2 cools down with the ambient temperature, the structure of the bimetallic strip 2 will recover, and the moving contact 21 and the stationary contact 31 can close again. After the moving contact 21 and the stationary contact 31 are disconnected, the movable part 4 moves towards the top of the overload protection plug under the drive of the elastic part 5. The isolation part 41 of the protection part extends between the moving contact 21 and the stationary contact 31, which can not only cut off the arc and block the arc combustion, but also play a safety protection role.

[0051] The overload protection plug of this application improves the insulation protection performance by setting an inner shell inside the outer shell 9. The inner shell integrates a movable part 4, an elastic part 5, a first plug 1, a bimetallic strip 2, and a contact piece 3. The bimetallic strip 2 is disposed between the first plug 1 and the contact piece 3. A moving contact part 21 and a stationary contact part 31 are disposed opposite to each other between the bimetallic strip 2 and the first plug 1 or the contact piece 3. When the current is too large or the temperature is too high, the bimetallic strip 2 bends and deforms, causing the oppositely disposed moving contact part 21 and stationary contact part 31 to separate and disconnect the circuit.

[0052] The movable part 4 is connected to the elastic element 5, allowing the top of the movable part 4 to extend and retract relative to the reset hole. An isolation part 41 is provided at the bottom of the movable part 4, which extends between the moving contact part 21 and the stationary contact part 31. With the extension and retraction of the movable part 4, it isolates or moves away from the moving contact part 21 and the stationary contact part 31. The isolation part 41 extending between the moving contact part 21 and the stationary contact part 31 serves both to cut off the electric arc and prevent its combustion, and to provide safety protection. The movable part 4, elastic element 5, first plug 1, bimetallic strip 2, and contact piece 3 occupy a small space within the inner shell. Furthermore, the product assembly is simple, improving production efficiency and safety performance.

[0053] This utility model overload protection plug adopts an integrated design method, incorporating an overload protection component inside the plug. This effectively protects the product from overload conditions at the current input end, protecting both the socket and the cable, thus enhancing safety. Furthermore, the integrated design method reduces the number of parts, improves assembly efficiency, and enhances product safety performance.

[0054] Preferably, in this embodiment of the application, the static contact 31 is disposed on the contact piece 3, and the bimetallic strip 2 has the moving contact 21 disposed at one end and is fixedly installed with the first plug 1 at the other end. Of course, in other feasible ways, the static contact 31 can be disposed on the first plug 1, and the bimetallic strip 2 has the moving contact 21 disposed at one end and is fixedly installed with the contact piece 3 at the other end.

[0055] In a preferred embodiment of this application, the moving contact 21 and the stationary contact 31 are replaced by a moving contact and a stationary contact, respectively, resulting in better contact and stronger conductivity. Of course, direct contact between the bimetallic strip 2 and the first plug 1 or the contact piece 3 can also achieve the effect of conducting the circuit. In this embodiment, the moving contact and the stationary contact are connected by touching each other. If the stationary contact is removed and the moving contact is directly pressed on the first plug 1 or the contact piece 3, a similar effect can be achieved. Alternatively, the moving contact can be removed and the stationary contact can be retained, which is also within the protection scope of this utility model.

[0056] In this embodiment, the bimetallic strip 2 and the first plug 1, or the bimetallic strip 2 and the contact piece 3, can be directly riveted, which is cost-effective. However, connections made by spot welding, soldering, or other methods are also within the scope of protection of this utility model. Figure 8 A schematic diagram of the structure showing the bimetallic strip and the first plug being fixedly installed is shown.

[0057] Preferably, in one possible implementation, the edge of the pressing part 42 of the movable member 4 is provided with a limiting part. The elastic member 5 drives the pressing part 42 of the movable member 4 to extend out of the reset hole. The limiting part on the pressing part contacts the inner shell and is limited by the inner shell, so that the movable member 4 can partially extend out of the reset hole. The isolation part is located between the moving contact part 21 and the stationary contact part 31. The pressing part 42 is compressed by force to compress the elastic member 5. The elastic member 5 is compressed and stores energy. After the isolation part 41 moves out of the space between the moving contact part 21 and the stationary contact part 31, the isolation part 41 is limited by the closed moving contact part 21 and the stationary contact part 31, so that it cannot move towards the reset hole and has the potential energy to move towards the reset hole under the action of the elastic member 5. When the moving contact part 21 and the stationary contact part 31 are the moving contact and the stationary contact respectively, the mating moving contact and the stationary contact can limit the isolation part. In addition, other parts of the moving part 4 can be limited by other parts of the bimetallic strip 2 and the elastic part 5 can be stored in energy, instead of having to limit the isolation part 41.

[0058] Preferably, Figure 3 As shown, the pressing part 42 of the movable part 4 can be a cylindrical structure, which slides with the second reset hole 01, or it can be other columnar structures or other structures that are easy to press; the isolation part 41 of the movable part 4 is a plate-like structure that extends from one side of the bottom end of the movable part 4, and is used to isolate between the moving contact part 21 and the stationary contact part 31. A groove 43 is provided in the middle of the movable part 4, and the elastic member 5 is partially placed in the groove 43; in this embodiment, the movable part 4 is an irregular shape integrally injection molded, the elastic member 5 is a compression spring, and the inner surface of the groove 43 is an arc shape that cooperates with the compression spring. In order to reduce the volume of the movable part 4, the side part of the elastic member 5 is placed in the groove 43, and a limiting boss 44 is formed by protruding at one end of the groove 43 in the middle of the movable part 4. One end of the elastic member 5 abuts against the limiting boss 44, and the other end abuts against the inner shell.

[0059] The movable part 4 is integrally formed and has a pressing part 42 for resetting, an isolation part 41 protecting between the moving contact part 21 and the stationary contact part 31, and a groove 43 for accommodating the elastic part 5. It has a simple structure and is easy to install and operate.

[0060] After the circuit fault is cleared, press the pressing part 42 of the movable part 4 to compress the elastic part 5, so that the isolation part 41 of the movable part 4 is placed below the moving contact part 21 and the stationary contact part 31 again. The moving contact part 21 and the stationary contact part 31 come together under the elastic action of the bimetallic strip 2, thereby conducting the circuit.

[0061] Preferably, in the normal operating state (i.e., the "ON" state), the top end of the pressing part 42 of the movable member 4 is flush with the outer shell 9; in the overload disconnect state (i.e., the "OFF" state), the top end of the pressing part 42 of the movable member 4 extends beyond one side of the outer shell 9. Figure 1 and Figure 6 This is a schematic diagram of the overload protection plug in the "ON" state of this application. Figure 2 and Figure 5 This is a schematic diagram of the overload protection plug in the "OFF" state of this application.

[0062] Preferably, the contact piece 3 includes a first cable mounting portion 32 extending out of the inner shell, the first cable mounting portion 32 being located between the outer shell and the inner shell, the first plug 1 extending out of the inner shell and from the plug hole of the outer shell; the inner shell is also provided with at least one second plug 03, the second plug 03 extending out of the inner shell and from the plug hole of the outer shell, and the second plug 03 having a second cable mounting portion 033 extending out of the inner shell, the second cable mounting portion 033 being located between the outer shell and the inner shell.

[0063] Preferred, such as Figure 1 , Figure 2 and Figure 7 As shown, in this embodiment, the overload protection plug provided by this utility model is a three-prong plug, including a first plug 1 and two second plugs 03. The first plug 1 is used to connect the live wire (L pole), and the two second plugs 03 are used to connect the neutral wire (N pole) and the ground wire, respectively. For ease of understanding, the two second plugs 03 in this embodiment are replaced by second plug 03 and third plug 04, respectively.

[0064] In one possible implementation, the overload protection plug is a two-prong plug, including a first plug 1 and a second plug 03, which are respectively connected to the live wire and the neutral wire; or, the overload protection plug is a four-prong plug used in a three-phase four-wire circuit, including a first plug 1 and three second plugs 03, which will not be described in detail.

[0065] In a preferred embodiment, the inner shell is provided with a plug hole 02, and the first plug 1 extends detachably from the plug hole 02. At least one second plug 03 is integrally injection molded with the inner shell. In this embodiment, the second plug 03 and the third plug 04 are metal conductors, which are placed into the mold during the injection molding of the inner shell and integrally injection molded with the inner shell, thereby improving production efficiency and insulation protection performance. Meanwhile, in other embodiments, the second plug 03 and the third plug 04 can also be assembled with the inner shell in a secondary process.

[0066] Preferred, such as Figure 12 and Figure 13As shown, at least one cable limiting groove 6 is provided on the outer side of the inner shell. The at least one cable limiting groove 6 is used to fix the first cable and / or the second cable and / or the third cable. The cable limiting groove 6 is located between the outer shell and the inner shell to limit the cable. In this embodiment, the first cable, the second cable, and the third cable are respectively a live wire cable, a neutral wire cable, and a ground wire cable. Figure 12 This is a structural diagram showing the inner shell, cables, and plugs after installation. Figure 13 This is a schematic diagram of the structure after the inner shell and plug are installed.

[0067] Furthermore, the cable limiting groove 6 protrudes from the outside of the inner shell, forming a barb structure. The opening direction of the barb structure is opposite to the direction in which the overload protection plug is inserted into the socket, which facilitates the cable to extend into or wrap around the barb and be fixed by the barb.

[0068] Furthermore, in another possible implementation, the cable limiting groove 6 is recessed into the side of the inner shell, forming a strip-shaped receiving groove on the side of the inner shell. The first cable and / or the second cable and / or the third cable can be placed inside the cable limiting groove 6, wrapped around the side of the inner shell, and fixed by the cable limiting groove 6.

[0069] Furthermore, in this embodiment, since the third cable is far from the third cable mounting part 043, a cable limiting groove 6 is provided on the side of the inner shell near the first plug 1, between the first plug 1 and the third plug 04, for limiting and fixing the third cable.

[0070] Preferred, Figure 9 A schematic diagram of the structure of the first plug 1 is shown. Figure 10 A schematic diagram of the structure of the second plug 03 is shown. Figure 11 A schematic diagram of the third plug 04 is shown.

[0071] like Figure 9 , Figure 10 and Figure 11As shown, in the three-prong overload protection plug of this application, the first plug 1 includes a first plug body 11, a first connecting plate 12, and a second connecting plate 13 that are integrally cast and sequentially bent and connected. In this embodiment, the angle between the plane of the first plug body 11 and the plane of the first connecting plate 12 is 150°, and the angle between the plane of the first connecting plate 12 and the plane of the second connecting plate 13 is 90°. The second connecting plate 13 is used for riveting with a bimetallic strip. The second plug 03 includes a second plug body 031 and a second cable connecting plate 032 that are integrally cast and bent and connected. In this embodiment, the angle between the plane of the second plug body 031 and the plane of the second cable connecting plate 032 is 90°. The third plug 04 includes a third plug body 041 and a third cable connecting plate 042 that are integrally cast and bent and connected. In this embodiment, the angle between the plane of the third plug body 041 and the plane of the third cable connecting plate 042 is 90°.

[0072] The bent structural design allows the second and third plugs to be embedded inside the inner shell, enhancing the insulation and sealing of the plugs.

[0073] Furthermore, such as Figure 3 , Figure 10 and Figure 11 As shown, the contact piece 3 is provided with the first cable mounting part 32 for mounting the first cable, and the second cable connecting plate 032 and the third cable connecting plate 042 are respectively provided with the second cable mounting part 033 and the third cable mounting part 043 for connecting the second cable and the third cable.

[0074] Furthermore, such as Figure 13 As shown, the first cable mounting part 32, the second cable mounting part 033 and the third cable mounting part 043 extend out of the inner shell to facilitate the installation of the first cable, the second cable and the third cable. The first cable mounting part 32, the second cable mounting part 033 and the third cable mounting part 043 are located between the outer shell and the inner shell, and the outer shell provides insulation protection for them.

[0075] Furthermore, the first cable mounting part 32, the second cable mounting part 033 and the third cable mounting part 043 are hole-like structures, through which the first cable, the second cable and the third cable can be inserted and fixed by welding. In this application, the hole-like structure is elliptical, but it can also be circular or other shapes.

[0076] Furthermore, the first cable mounting part 32, the second cable mounting part 033 and the third cable mounting part 043 can also be boss structures, and the first cable, the second cable and the third cable can be fixed to the boss structure by welding or winding.

[0077] Preferably, Figure 9 and Figure 10 As shown, the middle part of the first plug 1 and the middle part of the second plug 03 are thinned to form a recessed area 7, and a rubber coating process hole 71 is opened in the recessed area 7 to fix the rubber for molding and coating in the middle. In a preferred embodiment, the two opposite sides of the recessed area 7 of the first plug 1 and the two opposite sides of the recessed area 7 of the second plug 03 are provided with concave and convex textures, such as diamond patterns, to increase the friction between the rubber and the first plug 1 and the second plug 03. Insulating rubber is provided in the recessed area 7 of the first plug 1 and the recessed area 7 of the second plug 03 to form an insulating sleeve for insulation protection and to avoid phase-to-phase short circuit.

[0078] After the first plug 1 and the second plug 03 are covered with rubber, the insulation and waterproof performance of the covered area can be improved. At the same time, the insulating rubber can also effectively isolate electromagnetic interference, improve the anti-interference ability of the plug, and ensure the normal operation of the equipment. Since the third plug 04 in this embodiment is connected to the ground cable, it does not need to be covered with insulating rubber.

[0079] Furthermore, such as Figure 14 As shown, the insulating rubber of the second plug 03 is integrally injection molded with the inner shell. The insulating rubber of the second plug 03 extends from the inner shell toward the socket towards the direction in which the plug is inserted into the socket. The integral injection molding saves time, improves production efficiency, and provides better insulation. Preferably, the extension length of the insulating rubber of the second plug 03 is 9.2 to 9.4 mm. The first plug 1 is injection molded and can pass through the plug hole 02 after the first plug 1 is encapsulated.

[0080] Preferably, Figure 15 and Figure 16 As shown, the inner shell includes a cover plate 81 and a base 82. The cover plate 81 covers the base 82 along the thickness direction of the overload protection plug. A first fixing part 84 is provided on the base 82, and a second fixing part 85 is provided on the cover plate 81. The cover plate 81 and the base 82 are fixedly installed through the first fixing part 84 and the second fixing part 85. In this embodiment, the second reset hole 01 of the inner shell is divided into semicircles and respectively provided on the cover plate 81 and the base 82.

[0081] Furthermore, continuing as Figure 16 As shown, a plug limiting post 83 is provided on the cover plate 81. After the cover plate 81 and the base 82 are installed, the plug limiting post 83 can fix and limit the first plug 1.

[0082] Furthermore, the first fixing part 84 is an ultrasonic welding groove formed on the periphery of the base 82 relative to the cover plate 81, and the second fixing part 85 is a correspondingly provided ultrasonic welding boss; alternatively, the first fixing part 84 is an ultrasonic welding boss, and the second fixing part 85 is a correspondingly provided ultrasonic welding groove. The cover plate 81 and base 82 are fixedly installed using an ultrasonic welding process. To enhance the sealing and insulation effect of the inner shell, ultrasonic welding grooves and ultrasonic welding bosses are provided at the contact points of the outer edges of both the cover plate 81 and the base 82.

[0083] Furthermore, in this embodiment, the ultrasonic welding boss is a "V" shaped structure, and the ultrasonic welding groove is a concave trapezoidal structure.

[0084] Furthermore, in other feasible embodiments, the first fixing part 84 is a positioning post on the side of the base 82, and the second fixing part 85 is a positioning groove on the side of the cover plate 81 for installing the positioning post. The base 82 and the cover plate 81 are fixedly installed through the fixed cooperation of the positioning post and the positioning groove.

[0085] Preferably, Figure 1 As shown, the outer shell 9 encloses the inner shell, forming a dense insulating layer on the outside of the inner shell. The outer shell 9 includes three plug holes 02 corresponding to the three plugs. When the overload protection plug is in the "OFF" state, the length of the top end of the pressing part 42 of the movable member 4 extending out of the outer shell is preferably 4 to 7 mm.

[0086] This utility model has a simple and reasonable structural design, is easy to install and disassemble, and is safe and reliable to use, making it suitable for promotion and application.

[0087] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0088] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. An overload protection plug, comprising a housing, the housing having a reset hole and at least two plug holes, characterized in that, The outer shell is further provided with an inner shell, which contains a movable part (4), an elastic part (5), a bimetallic strip (2), a contact piece (3), and a first plug (1). The bimetallic strip (2) is disposed between the first plug (1) and the contact piece (3). One end of the bimetallic strip (2) is connected to the first plug (1), and the other end is provided with a moving contact part (21). The contact piece (3) is provided with a static contact part (31) corresponding to the moving contact part (21); or one end of the bimetallic strip (2) is connected to the contact piece (3), and the other end is provided with a moving contact part (21). The first plug (1) is provided with a static contact part (31) corresponding to the moving contact part (21). The inner shell is provided with a second reset hole (01), which corresponds to the reset hole. The elastic part (5) is connected to the movable part (4), and the movable part (4) is provided with a pressing part (42) and an isolating part (41). When the bimetallic strip (2) is heated and deformed, causing the moving contact (21) to separate from the stationary contact (31), the elastic element (5) drives the moving element (4) to move, causing the pressing part (42) to extend out of the reset hole, and the isolation part (41) to extend between the moving contact (21) and the stationary contact (31); The pressing part (42) is subjected to force that causes the isolating part (41) to move out between the moving contact part (21) and the stationary contact part (31), and the moving part (4) is limited and the elastic part (5) stores energy.

2. The overload protection plug according to claim 1, characterized in that, The first plug (1) is arranged along a first direction, the elastic element (5) drives the movable element (4) to extend and retract along a second direction, and the contact piece (3) is arranged along a second direction. The direction in which the first plug (1) is inserted into the socket is the first direction, and the first direction is perpendicular to the second direction.

3. The overload protection plug according to claim 1, characterized in that, The movable part (4) has a cylindrical structure at one end of the pressing part (42), which is slidably engaged with the second reset hole (01). The isolation part (41) is a plate-shaped structure that extends from one side of the other end of the movable part (4). The movable part (4) has a groove (43) in the middle, and the elastic part (5) is partially placed in the groove (43).

4. The overload protection plug according to claim 1, characterized in that, The contact piece (3) includes a first cable mounting portion (32) extending out of the inner shell, the first cable mounting portion (32) being located between the outer shell and the inner shell, and a first plug (1) extending out of the inner shell and from the plug hole of the outer shell; the inner shell is also provided with at least one second plug (03), the second plug (03) extending out of the inner shell and from the plug hole of the outer shell, and the second plug (03) is provided with a second cable mounting portion (033) extending out of the inner shell, the second cable mounting portion (033) being located between the outer shell and the inner shell.

5. The overload protection plug according to claim 4, characterized in that, The inner shell is provided with a plug hole (02), the first plug (1) extends detachably from the plug hole (02), and the second plug (03) is integrally injection molded with the inner shell.

6. The overload protection plug according to claim 1, characterized in that, At least one cable limiting groove (6) is provided on the outer side of the inner shell, and the cable limiting groove (6) is located inside the outer shell.

7. The overload protection plug according to claim 1, characterized in that, The overload protection plug is a three-prong plug, and also includes a second plug (03) and a third plug (04). The second plug (03) and the third plug (04) are integrally injection molded with the inner shell. The inner shell is provided with a plug hole (02) for detachably installing the first plug (1). The first plug (1) includes a first plug body (11) integrally cast and sequentially bent and connected, a first connecting plate (12) and a second connecting plate (13); the second plug (03) includes a second plug body (031) integrally cast and bent and connected, and a second cable connecting plate (032); the third plug (04) includes a third plug body (041) integrally cast and bent and connected, and a third cable connecting plate (042); The contact piece (3) includes a first cable mounting portion (32) extending out of the inner shell, and the second cable connecting plate (032) and the third cable connecting plate (042) respectively include a second cable mounting portion (033) and a third cable mounting portion (043) extending out of the inner shell. The first cable mounting portion (32), the second cable mounting portion (033) and the third cable mounting portion (043) are located between the outer shell and the inner shell.

8. The overload protection plug according to claim 7, characterized in that, The angle between the plane of the first plug body (11) and the plane of the first connecting plate (12) is (150)°, and the angle between the plane of the first connecting plate (12) and the plane of the second connecting plate (13) is (90)°; the angle between the plane of the second plug body (031) and the plane of the second cable connecting plate (032) is (90)°; the angle between the plane of the third plug body (041) and the plane of the third cable connecting plate (042) is (90)°.

9. The overload protection plug according to claim 7, characterized in that, The first cable mounting part (32), the second cable mounting part (033) and the third cable mounting part (043) have a hole-like structure.

10. The overload protection plug according to claim 6, characterized in that, The cable limiting groove (6) protrudes from the outside of the inner shell, forming a barb structure. The opening direction of the barb structure is opposite to the direction in which the overload protection plug is inserted into the socket.

11. The overload protection plug according to claim 4 or 7, characterized in that, The middle part of the first plug (1) and the middle part of the second plug (03) are recessed areas (7), and the recessed areas (7) are provided with rubber coating process holes (71); the two opposite sides of the recessed areas (7) of the first plug (1) and the two opposite sides of the recessed areas (7) of the second plug (03) are provided with textured surfaces; the recessed areas (7) of the first plug (1) and the recessed areas (7) of the second plug (03) are provided with insulating rubber.

12. The overload protection plug according to claim 11, characterized in that, The insulating rubber of the second plug (03) is integrally injection molded with the inner shell and extends from the inner shell toward the socket toward the direction in which the plug is inserted into the socket.

13. The overload protection plug according to claim 1, characterized in that, The inner shell includes a cover plate (81) and a base (82). The cover plate (81) covers the base (82). The base (82) is provided with a first fixing part (84). The cover plate (81) is provided with a second fixing part (85). The cover plate (81) and the base (82) are fixedly installed by the first fixing part (84) and the second fixing part (85).

14. The overload protection plug according to claim 13, characterized in that, The first fixing part (84) is an ultrasonic welding groove opened on the four sides of the base (82) relative to the cover plate (81), and the second fixing part (85) is a corresponding ultrasonic welding boss.

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