Plug

Abstract

The invention relates to a plug, and belongs to the technical field of power supplies. The plug comprises a shell, a plug pin support, an L-pole plug pin, an N-pole plug pin and an overload protection module, the L-pole plug pin comprises an L-pole plug pin part and an L-pole terminal, and the N-pole plug pin comprises an N-pole plug pin part and an N-pole terminal; the bolt support is located in the shell, the N-pole bolt is located on the first side of the center line of the bolt support and extends out of the shell, and one end of the N-pole bolt is located in the shell and fixedly connected with the N-pole terminal. The L-pole bolt part is located on the second side of the center line of the bolt support and extends out of the shell, one end is located in the shell, and the L-pole wiring end is located in the shell; and the overload protection module is positioned between the N-pole terminal and the L-pole bolt part, and is used for switching on the electric connection between the L-pole bolt part and the L-pole terminal when the internal temperature is not higher than a set threshold value, and switching off the electric connection between the L-pole bolt part and the L-pole terminal when the internal temperature is higher than the set threshold value. According to the invention, the use safety of the plug can be improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of power supply, and in particular to a plug. Background Art

[0002] As people's living standards improve, their demand for electricity is growing. As common power-collecting devices in homes, people are paying more and more attention to the safety of plugs and sockets.

[0003] However, as electrical equipment becomes more and more abundant, people often inadvertently overload or short-circuit, which may cause fires and serious damage to people's lives and property. Therefore, researchers in the industry have been committed to studying and using safer power-drawing devices. Summary of the invention

[0004] In order to solve the problems of the prior art, an embodiment of the present disclosure provides a plug. The technical solution is as follows.

[0005] The plug comprises a housing, a plug bracket, an L-pole plug, an N-pole plug and an overload protection module, wherein the L-pole plug comprises an L-pole plug portion and an L-pole terminal, and the N-pole plug comprises an N-pole plug portion and an N-pole terminal;

[0006] The latch bracket is located in the housing, the N-pole latch is located on a first side of the center line of the latch bracket, and the N-pole latch portion extends out of the housing, with one end located in the housing and fixedly connected to the N-pole terminal;

[0007] The L-pole latch portion is located on the second side of the center line of the latch bracket and extends out of the housing, with one end located in the housing, and the L-pole terminal is located in the housing;

[0008] The overload protection module is located between the N-pole terminal and the L-pole plug portion, and is used to connect the electrical connection between the L-pole plug portion and the L-pole terminal when the internal temperature is not higher than a set threshold, and to cut off the electrical connection between the L-pole plug portion and the L-pole terminal when the internal temperature is higher than the set threshold.

[0009] Optionally, the L-pole terminal is located on a second side of a center line of the plug bracket and is farther away from a power cord outlet terminal of the plug than the L-pole plug portion.

[0010] Optionally, the plug further comprises a grounding pin, wherein the grounding pin comprises a grounding pin portion and a grounding terminal;

[0011] The ground electrode plug is located on the center line of the plug bracket, and the ground electrode plug portion extends out of the housing, with one end located in the housing and fixedly connected to the ground electrode terminal;

[0012] The overload protection module is arranged between the N-pole terminal and the L-pole plug portion, along the center line of the plug bracket, and between the ground terminal and the power line outlet of the plug.

[0013] Optionally, the L-pole terminal includes an L-pole wire pressing hole, a connecting piece and a static contact piece, and the connecting piece is connected between the L-pole wire pressing hole and the static contact piece;

[0014] The connecting piece is fixed on the shell wall of the overload protection module, and the static contact piece is located in the shell of the overload protection module and is electrically connected to the moving contact piece of the overload protection module. The L-pole wire pressing hole is located outside the shell of the overload protection module.

[0015] Optionally, the L-pole wire pressing hole, the connecting piece and the static contact piece are integrally formed;

[0016] The L-pole wire pressing hole is a cylindrical structure rolled up toward one side of the connecting piece compared to the connecting piece, and the static contact piece is bent to one side of the connecting piece compared to the connecting piece.

[0017] Optionally, a connection between the connecting piece and the L-pole wire pressing hole has an insertion hole, and an end of the L-pole wire pressing hole along the rolling direction has an insertion piece extending along the rolling direction, and the insertion piece extends into the insertion hole.

[0018] Optionally, the hole wall of the L-pole wire crimping hole has at least one notch at a position close to the end of the L-pole wire crimping hole along the rolling direction, and the notch is used to reduce the strength of the hole wall of the L-pole wire crimping hole to facilitate crimping with the L-pole wire of the power line.

[0019] Optionally, the L-pole wire pressing hole and the static contact piece are located on different sides of the connecting piece.

[0020] Optionally, in a height direction perpendicular to the latch bracket, the end of the L-pole latch located at the housing is lower than or flush with the bottom end of the L-pole wire pressing hole facing the latch bracket.

[0021] Optionally, the overload protection module includes a housing, a deformable sheet and a reset mechanism, wherein the deformable sheet includes a fixed sheet and a movable contact sheet that are relatively positioned;

[0022] The deformable piece is located in the housing, and the fixed piece is fixed in the housing and electrically connected to the L-pole plug portion, and the movable contact piece is used to be electrically connected to the stationary contact piece of the L-pole terminal;

[0023] The overload protection module is used to, when the internal temperature is higher than a set threshold, deform the deformable piece so that the movable contact piece bounces relative to the static contact piece; when the internal temperature is not higher than the set threshold, reset the deformable piece and the reset mechanism so that the movable contact piece and the static contact piece are combined.

[0024] Optionally, the deformable sheet is a bimetallic sheet fixed to each other, including a first metal sheet and a second metal sheet, the thermal expansion coefficient of the first metal sheet is greater than the thermal expansion coefficient of the second metal sheet, and the moving contact on the moving contact sheet is located on the surface of the first metal sheet.

[0025] Optionally, the deformable sheet includes a pot piece connected between the fixed sheet and the moving contact piece, and the pot piece bulges in a direction away from the moving contact.

[0026] Optionally, the reset mechanism includes a push rod and an elastic member;

[0027] The push rod and the elastic member are both assembled in the housing, and the elastic member is compressed between the push rod and the bottom of the housing, and a spacer is provided at a first side of the push rod and near the bottom;

[0028] When the moving contact piece and the stationary contact piece are in a combined state, the partition is located below the moving contact piece near the bottom of the shell, and when the moving contact piece and the stationary contact piece are in a separated state, the partition is sandwiched between the moving contact piece and the stationary contact piece.

[0029] Optionally, the bottom of the rod portion of the push rod has an extension portion extending along the length direction, and the spacer is located on a first side of the extension portion.

[0030] Optionally, the bottom of the shell has a mounting groove, the notch of the mounting groove faces away from the bottom of the shell, and the elastic member is assembled in the mounting groove;

[0031] The groove wall of the installation groove has a first strip opening along the groove depth direction and extending to the groove mouth, the bottom of the rod portion of the push rod extends into the installation groove to compress the elastic member, the extension portion is located in the first strip opening, and the spacer is located outside the installation groove.

[0032] Optionally, the second side of the push rod has a limiting plate, the groove wall of the mounting groove also has a second strip-shaped opening along the groove depth direction and extending through the groove opening, and the limiting plate is located in the second strip-shaped opening.

[0033] Optionally, the first side and the second side of the push rod are front and rear sides distributed along the length direction of the overload protection module, wherein the length direction of the overload protection module is parallel to the center line of the latch bracket.

[0034] Optionally, the rod portion of the push rod and the groove wall of the mounting groove both have a tangent plane, the tangent plane faces away from the L-pole terminal, and the deformation sheet is located between the shell wall of the shell and the tangent plane.

[0035] Optionally, the bottom of the shell has an opening at a position corresponding to the mounting groove, the opening is communicated with the mounting groove, and the opening is used to allow the elastic member to be installed in the mounting groove.

[0036] Optionally, the overload protection module further includes a sealing plug, the sealing plug is interference fit in the opening, and the elastic member abuts against the sealing plug.

[0037] Optionally, an annular convex rib is arranged on the outer surface of the bottom of the shell along the opening, and the annular convex rib has a plurality of openings penetrating the thickness and height of the annular convex rib;

[0038] When the annular convex rib is expanded and matched along the radial direction, the sealing plug is interference fit between the opening and the annular convex rib;

[0039] Wherein, the height direction of the annular rib is perpendicular to the bottom of the shell, and the thickness direction is parallel to the radial direction of the opening.

[0040] Optionally, the diameters of the opening and the annular rib gradually increase from the outside of the shell to the inside of the shell in the axial direction of the opening;

[0041] The diameter of the sealing plug gradually increases from the outside of the shell to the inside of the shell in the axial direction of the sealing plug.

[0042] Optionally, the annular rib has a first guide structure at an opening away from the mounting groove, and the sealing plug has a second guide structure at an end close to the mounting groove;

[0043] Under the cooperation of the first guide structure and the second guide structure, and under the cooperation of the annular rib being expanded in the radial direction, the sealing plug is interference-located in the opening and the annular rib.

[0044] Optionally, the inner surface of the latch bracket has a recessed groove, and the annular rib is located in the recessed groove.

[0045] Optionally, a groove is provided on the inner end surface of the sealing plug facing the mounting groove, and the elastic member abuts against the inner end surface between the groove wall of the groove and the outer wall of the sealing plug.

[0046] Optionally, the top of the push rod passes through the housing of the overload protection module and the outer shell of the plug in sequence to be exposed outside the outer shell.

[0047] In the solution shown in the present disclosure, an overload protection module is integrated on the basis of the original plug, so that the plug becomes a pot protection plug. When the current in the circuit where the plug is located is too large, the overload protection module can disconnect the electrical connection between the L-pole terminal and the L-pole plug part, thereby improving the safety of the plug.

[0048] Moreover, the overload protection module is integrated into the plug, so there is no need to arrange the overload protection module on the mobile socket connected to the plug, and thus more sockets can be arranged on the mobile socket, or the mobile socket can be made smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0050] Figure 1 is a schematic structural diagram of a plug provided by an exemplary embodiment of the present disclosure;

[0051] Figure 2 is a schematic diagram of an arrangement of three latches and an overload protection module on a latch bracket provided by an exemplary embodiment of the present disclosure;

[0052] Figure 3 is a structural schematic diagram of an L-pole terminal provided by an exemplary embodiment of the present disclosure;

[0053] Figure 4 It is a schematic structural diagram of a straight-line conductive sheet before forming an L-pole terminal provided by an exemplary embodiment of the present disclosure;

[0054] Figure 5 is a schematic diagram of the height relationship between an L-pole plug portion and an L-pole terminal provided by an exemplary embodiment of the present disclosure;

[0055] Figure 6 is a schematic diagram of the height relationship between three latches and an overload protection module on a latch bracket provided by an exemplary embodiment of the present disclosure;

[0056] Figure 7 is a schematic structural diagram of a deformable sheet provided by an exemplary embodiment of the present disclosure;

[0057] Figure 8 is a schematic diagram of a deformation sheet and an L-pole terminal provided by an exemplary embodiment of the present disclosure being installed in a bottom shell of a housing;

[0058] Fig. 9is a structural schematic diagram of a reset mechanism provided by an exemplary embodiment of the present disclosure;

[0059] Fig.10 is a schematic diagram of an exemplary embodiment of the present disclosure before a push rod is installed into a housing;

[0060] Fig.11 is a schematic diagram of a push rod provided by an exemplary embodiment of the present disclosure after being installed in a housing;

[0061] Fig.12 is a schematic diagram of a deformation sheet, a push rod and an L-pole terminal provided by an exemplary embodiment of the present disclosure after being installed in a housing;

[0062] Fig.13 is a schematic diagram of the bottom of a housing of an overload protection module provided by an exemplary embodiment of the present disclosure;

[0063] Fig.14 is a schematic diagram of an elastic member provided by an exemplary embodiment of the present disclosure abutting against a sealing plug;

[0064] Fig.15 is a schematic structural diagram of a latch bracket provided by an exemplary embodiment of the present disclosure;

[0065] Fig.16 is a schematic diagram of a push rod provided by an exemplary embodiment of the present disclosure after being installed in a housing;

[0066] Fig.17 is a schematic diagram of a deformation sheet and a push rod provided by an exemplary embodiment of the present disclosure after both are installed in a housing;

[0067] Fig.18 It is a schematic diagram of the structure after a deformation piece, a push rod and an L-pole terminal are installed in a housing according to an exemplary embodiment of the present disclosure;

[0068] Fig.19 is a schematic structural diagram of an upper cover and a bottom shell of a housing provided by an exemplary embodiment of the present disclosure after being fixed;

[0069] Fig. 20 It is a structural schematic diagram of an exemplary embodiment of the present disclosure in which an elastic member is installed into the housing from the bottom of the housing;

[0070] Fig.21 It is a structural schematic diagram of a sealing plug provided by an exemplary embodiment of the present disclosure sealing an opening at the bottom of a shell;

[0071] Fig. 22 is a structural schematic diagram of an overload protection module provided by an exemplary embodiment of the present disclosure;

[0072] Fig.23is a schematic structural diagram of an upper cover and a bottom shell of a housing provided by an exemplary embodiment of the present disclosure before being fixed;

[0073] Fig.24 It is a schematic diagram of the disassembly of an overload protection module and a latch bracket provided by an exemplary embodiment of the present disclosure;

[0074] Fig.25 is a schematic structural diagram of a common plug provided by an exemplary embodiment of the present disclosure;

[0075] Fig.26 It is a schematic diagram of the structure of a common plug provided by an exemplary embodiment of the present disclosure.

[0076] Description of Reference Numerals

[0077] 1. Shell; 11. Bulge.

[0078] 2. Latch bracket; 21. Power cord bracket; 22. Sink.

[0079] 3. L-pole plug; 31. L-pole plug portion; 32. L-pole wiring terminal; 321. L-pole wire hole; 322. Connecting piece; 323. Static contact piece; 324. Plug hole; 325. Plug piece; 326. Notch.

[0080] 4. N-pole plug; 41. N-pole plug portion; 42. N-pole terminal.

[0081] 5. grounding pin; 51. grounding pin portion; 52. grounding terminal.

[0082] 6. Overload protection module; 61. Shell; 62. Deformation plate; 63. Push rod; 64. Elastic member; 65. Sealing plug; 66. Transition plate.

[0083] 611, mounting groove; 6111, first strip-shaped opening; 6112, second strip-shaped opening.

[0084] 612, opening; 613, annular rib; 614, sleeve.

[0085] 621, fixed piece; 622, moving contact piece; 623, pot piece.

[0086] 631, rod portion; 632, spacer; 633, extension portion; 634, limit plate; 635, first rod portion; 636, second rod portion. DETAILED DESCRIPTION

[0087] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0088] The present embodiment relates to a plug, which may be a power plug, for example, a plug of a mobile socket, or a plug of an electrical appliance, for example, a plug of a washing machine or a refrigerator. The plug in the present embodiment may be a plug with a power cord, or a plug without a power cord. The plug in the present embodiment may be a three-phase plug including an L pole, an N pole, and a ground pole, or a two-phase plug including an L pole and an N pole.

[0089] The plug described in this embodiment is integrated with an overload protection module, so the plug of this embodiment is also called an overload protection plug. In this embodiment, the overload protection module is integrated in the plug without changing the shape and size of the plug.

[0090] The plug in this embodiment is provided with an overload protection module, which is beneficial to reducing the size of the mobile socket to which the plug is connected. This is because the overload protection module is integrated in the plug, so there is no need to arrange the overload protection module in the mobile socket, which not only improves the safety of the use of the plug and the socket, but also reduces the volume of the socket, so that the socket can be arranged with more jacks within a limited size.

[0091] The structural features of the plug described in this embodiment will be described in detail below.

[0092] like Figure 1 As shown, it is a schematic diagram of the structure of the plug. Figure 1 The plug shown is a plug with a power cord, where the power cord is not fully shown. Figure 2 As shown, Figure 1 Schematic diagram of the structure after the shell 1 is hidden. Figure 1 and Figure 2 As shown, the plug includes a housing 1, a plug bracket 2, an L-pole plug 3 and an N-pole plug 4, wherein the L-pole plug 3 includes an L-pole plug portion 31 and an L-pole terminal 32, and the N-pole plug 4 includes an N-pole plug portion 41 and an N-pole terminal 42.

[0093] As mentioned above, the plug can be a three-phase plug or a two-phase plug. For ease of introduction, the three-phase plug is used as an example in the accompanying drawings. Figure 1 as well as Figure 2 As shown, the plug further includes a grounding pin 5 , wherein the grounding pin 5 includes a grounding pin portion 51 and a grounding terminal 52 .

[0094] refer to Figure 2 As shown, the N-pole plug 4 is located on the first side (such as the left side) of the center line of the plug bracket 2, and the N-pole plug portion 41 extends out of the housing 1 to be inserted into the N-pole socket of the socket, and one end of the N-pole plug portion 41 is located in the housing 1 to be fixedly connected to the N-pole terminal 42.

[0095] The L-pole plug portion 31 is located on the second side (such as the right side) of the center line of the plug bracket 2, and the L-pole plug portion 31 extends out of the housing 1 to be inserted into the L-pole socket of the socket, and one end of the L-pole plug portion 31 is located in the housing 1 to be electrically connected to the L-pole terminal 32 located in the housing 1. It should be noted that the L-pole plug portion 31 and the L-pole terminal 32 are not fixedly connected, but are electrically connected through the overload protection module 6.

[0096] The position of the N-pole latch portion 41 and the position of the L-pole latch portion 31 may be symmetrically distributed about the center line of the latch bracket 2 .

[0097] Continue to refer Figure 2 As shown, the ground pin 5 is located on the center line of the pin bracket 2, and the ground pin portion 51 extends out of the housing 1 to be inserted into the N-pole socket of the socket. One end of the ground pin portion 51 is located in the housing 1 to be fixedly connected to the ground terminal 52.

[0098] In one example, the N-pole terminal 42 and the N-pole plug portion 41 are fixedly connected, so both are on the first side of the center line of the plug bracket 2, and the ground terminal 52 and the ground plug portion 51 are fixedly connected, so both are on or near the center line of the plug bracket 2.

[0099] However, the L-pole terminal 32 and the L-pole plug portion 31 are not fixedly connected, so the L-pole terminal 32 can be located on the first side of the plug bracket 2, on the same side of the center line of the plug bracket 2 as the N-pole terminal 42. Figure 2 As shown, the L-pole terminal 32 may also be located at the second side of the latch bracket 2 , and is located on the same side of the center line of the latch bracket 2 as the L-pole latch portion 31 .

[0100] Among them, the L-pole terminal 32 and the N-pole terminal 42 are located on the opposite sides of the center line of the plug bracket 2, which can prevent the L-pole line and the N-pole line of the line where the plug is located from being short-circuited. Therefore, in this embodiment, the L-pole terminal 32 and the N-pole terminal 42 are located on the opposite sides of the center line of the plug bracket 2. Figure 2 As shown, the L-pole terminal 32 and the N-pole terminal 42 are located on different sides of the center line of the latch bracket 2, and the L-pole terminal 32 and the L-pole latch portion 31 are both located on the same side of the center line of the latch bracket 2, both on the second side.

[0101] In one example, the L-pole terminal 32 and the L-pole plug portion 31 are located on the same side of the center line of the plug bracket 2, and the L-pole terminal 32 and the L-pole plug portion 31 can be arranged front and back along the center line direction, for example, referring to Figure 2 As shown, the L-pole terminal 32 is closer to the grounding pin and farther away from the power line outlet terminal than the L-pole plug portion 31 .

[0102] The above is an introduction to the position distribution of the L-pole plug 3, the N-pole plug 4 and the ground-pole plug 5 on the plug bracket 2. The following is an introduction to the position layout of the overload protection module 6.

[0103] Continue to refer Figure 2 As shown, the overload protection module 6 is located between the N-pole terminal 42 and the L-pole plug portion 31 .

[0104] Furthermore, the overload protection module 6 is arranged between the N-pole terminal 42 and the L-pole latch portion 31, along the center line of the latch bracket 2. The overload protection module 6 is arranged along the center line of the latch bracket 2, that is, the center line of the overload protection module 6 and the center line of the latch bracket 2 are in a straight line.

[0105] For example, for a three-phase plug, the overload protection module 6 is arranged between the N-pole terminal 42 and the L-pole plug portion 31 , along the center line of the plug bracket 2 , and between the ground terminal 52 and the power line outlet of the plug.

[0106] For another example, for a two-phase plug, the overload protection module 6 is arranged between the N-pole terminal 42 and the L-pole plug portion 31 , along the center line of the plug bracket 2 .

[0107] The overload protection module is arranged between the L-pole plug portion 31 and the N-pole terminal 42, and along the center line of the plug bracket 2, occupying the original space between the L-pole plug and the N-pole plug, so that the size of the plug will not be increased due to the arrangement of the overload protection module.

[0108] Because the L-pole plug is connected to the live wire and the N-pole plug is connected to the neutral wire, and the live wire is a live line, and the neutral wire is not live and is only responsible for returning current to the power supply, based on timely power cut-off and safety considerations, the overload protection module inside the plug needs to be connected to the L-pole line inside the plug. For this purpose, the L-pole plug portion 31 and the L-pole terminal 32 of the L-pole plug are physically separated due to the overload protection module 6.

[0109] refer to Figure 2 As shown, there is a distance between the L-pole plug portion 31 and the L-pole terminal 32 of the L-pole plug in a direction parallel to the center line of the plug bracket 2 , and the distance is smaller than the length of the overload protection module 6 in a direction parallel to the center line of the plug bracket 2 .

[0110] Although the physical positions of the L-pole plug portion 31 and the L-pole terminal 32 are separated by the overload protection module 6, they are still electrically connected. The electrical connection is achieved through the overload protection module 6. For example, the L-pole plug portion 31 is electrically connected to the fixed plate of the deformable plate 62 in the overload protection module 6, and the L-pole terminal 32 is electrically connected to the moving contact plate of the deformable plate 62 (the electrical connection relationship will be introduced later).

[0111] In this way, when the temperature inside the overload protection module 6 is not higher than the set threshold, the overload protection module 6 keeps the electrical connection between the L-pole plug portion 31 and the L-pole terminal 32 in an on state, and when the internal temperature is higher than the set threshold, the overload protection module 6 disconnects the electrical connection between the L-pole plug portion 31 and the L-pole terminal 32.

[0112] For example, when the current in the circuit where the plug is located is too large, more heat will be generated, causing the temperature inside the overload protection module 6 to rise. When it rises to a set threshold, the overload protection module 6 will disconnect the electrical connection between the L-pole plug portion 31 and the L-pole terminal 32 to prevent the temperature from continuing to rise and causing a fire.

[0113] like Figure 2 And refer to Figure 1 As shown, the housing 1 encloses the latch bracket 2 and the overload protection module 6 therein, while the L-pole latch portion 31 of the L-pole latch 3, the N-pole latch portion 41 of the N-pole latch 4 and the ground-pole latch portion 51 of the ground-pole latch 5 all extend out of the housing 1 and are exposed.

[0114] In one example, the housing 1 may be a structure including a bottom housing and an upper cover, and the bottom housing and the upper cover are fixedly connected by screws and / or snap connections. In another example, the housing 1 may also be a shell formed by a rubber encapsulation process.

[0115] The above is an introduction to the relative positions of the three pins of the plug and the overload protection module. The following will introduce the structural features of the three pins and the overload protection module respectively.

[0116] (a) Structural features of the three latches.

[0117] refer to Figure 2 As shown, the N-pole plug part 41 and the N-pole terminal 42 of the N-pole plug 4 are integrally formed. For example, a T-shaped conductive sheet, the two ends of its horizontal part face the same side of the vertical part, one end is rolled up in the counterclockwise direction, and the other end is rolled up in the clockwise direction. After the two ends are butted together, a closed cylindrical shape is formed, and a gap is formed at the butt joint of the two ends of the horizontal part, thus forming a vertical N-pole plug part 41 and a cylindrical N-pole terminal 42. The N-pole terminal 42 can also be an N-pole wire pressing hole because it is cylindrical. Among them, the gap of the N-pole terminal 42 is a weak point under stress and is easily deformed under stress. Therefore, when the N-pole terminal 42 is pressed with the power line, the gap of the N-pole terminal 42 is the point of action for applying pressure.

[0118] The structure of the ground electrode plug 5 is similar to that of the N electrode plug 4 and is also integrally formed and formed by a T-shaped conductive sheet. For details, please refer to the above description and will not be repeated here.

[0119] As described above, the L-pole plug portion 31 and the L-pole terminal 32 are physically separated, so the L-pole plug portion 31 and the L-pole terminal 32 are independent of each other. The features of the L-pole plug portion 31 and the L-pole terminal 32 will be described below.

[0120] Since the L-pole terminal 32 needs to be connected not only to the power line but also to the overload protection module 6, the structure of the L-pole terminal 32 is different from that of the N-pole terminal and the ground terminal 52. Figure 3 The structure diagram of the L-pole terminal 32 is shown in FIG. Figure 3 As shown, the L-pole terminal 32 includes an L-pole wire hole 321, a connecting piece 322 and a static contact piece 323, and the connecting piece 322 is connected between the L-pole wire hole 321 and the static contact piece 323. Figure 2 As shown, the connecting piece 322 is fixed on the shell wall of the housing 61 of the overload protection module 6, and the static contact piece 323 is located in the housing 61 of the overload protection module 6, and is used to be electrically connected to the overload protection module 6. For example, the static contact piece 323 is electrically connected to the moving contact piece in the overload protection module 6. The L-pole wire pressing hole 321 is used to connect with the power line, so the L-pole wire pressing hole 321 is located outside the housing 61 of the overload protection module 6.

[0121] In one example, the L-pole wire-pressing hole 321, the connecting piece 322 and the static contact piece 323 of the L-pole terminal 32 can be integrally formed, the L-pole wire-pressing hole 321 is a cylindrical structure rolled up toward one side of the thickness direction of the connecting piece 322 compared to the connecting piece 322, and the static contact piece 323 is bent to one side of the thickness direction of the connecting piece 322 compared to the connecting piece 322.

[0122] For example, refer to Figure 3 As shown, the L-pole wire pressing hole 321 and the static contact piece 323 are located on different sides of the connecting piece 322. Of course, the L-pole wire pressing hole and the static contact piece can also be located on the same side of the connecting piece 322.

[0123] like Figure 4 FIG. 1 is a schematic diagram showing the structure of a conductive sheet used to form an L-pole terminal 32. Figure 4 As shown, the conductive sheet is in the shape of a straight line, the portion of the conductive sheet near the first end is bent at ninety degrees to form a stationary contact sheet 323, the portion of the conductive sheet near the second end is rolled up into a cylindrical shape to form an L-pole wire hole 321, and the portion between the stationary contact sheet 323 and the L-pole wire hole 321 serves as a connecting sheet 322.

[0124] Compared with the one formed by the T-shaped conductive sheet, the L-pole terminal 32 formed by the I-shaped conductive sheet has the characteristics of simple structure, less material and low cost.

[0125] like Figure 4 And refer to Figure 3As shown, the connection between the connecting piece 322 and the L-pole wire pressing hole 321 has an insertion hole 324 , and the end of the L-pole wire pressing hole 321 along the rolling direction has an insertion piece 325 extending along the rolling direction, and the insertion piece 325 extends into the insertion hole 324 .

[0126] When the plug 325 is inserted into the socket 324, the edge of the L-pole wire hole 321 is firmly connected to the connecting piece 322 during riveting between the power cord and the L-pole wire hole 321, and the L-pole wire hole 321 is not easy to unfold in the reverse direction along the rolling direction, which can effectively avoid flying wires and misaligned riveting caused by crimping.

[0127] Continue to refer Figure 3 and Figure 4 As shown, the hole wall of the L-pole wire crimping hole 321 has at least one notch 326 near the end of the L-pole wire crimping hole 321 along the rolling direction. The notch 326 is used to reduce the strength of the hole wall of the L-pole wire crimping hole 321 to facilitate crimping with the L-pole wire of the power line.

[0128] For example, Figure 4 The conductive sheet shown has two notches 326 at a position close to the second end, that is, close to the plug 325. The two notches 326 can be symmetrically distributed, so the strength of the L-pole wire pressing hole 321 at the two notches 326 is relatively weak. In this way, during crimping with the power line, the L-pole wire pressing hole 321 is more likely to deform at the notch 326, and is crimped with the power line and then riveted, so that the connection between the power line and the L-pole wire pressing hole is more stable and less likely to have poor electrical contact.

[0129] As described above, when the N-pole terminal 42 is crimped with the power line, the gap of the N-pole terminal 42 is the position where pressure is applied, when the ground terminal 52 is crimped with the power line, the gap of the ground terminal 52 is the position where pressure is applied, and when the L-pole crimping hole 321 is crimped with the power line, the notch 326 of the L-pole crimping hole 321 is the position where pressure is applied. Then, in order to facilitate riveting, these three terminals are riveted with the power line. Figure 2 As shown, the gap of the N-pole terminal 42 and the notch 326 of the L-pole wire pressing hole 321 are distributed front and back in a direction parallel to the center line of the latch bracket 2, so the wire pressing direction of the L-pole wire pressing hole 321 and the N-pole terminal 42 can be front and back.

[0130] Continue to refer Figure 2 As shown, since the ground terminal 52 and the overload protection module 6 are both on the center line of the latch bracket 2, if the ground terminal 52 is crimped front to back, it will be interfered by the overload protection module 6. Therefore, the gap of the ground terminal 52 is on the left or right side of the center line, so that the crimping direction of the ground terminal 52 is left-right crimping.

[0131] In addition, since the L-pole terminal 32 and the power line need to be crimped and riveted, the L-pole plug portion 31 and the overload protection module 6 also need to be pressed and riveted, and the L-pole terminal 32 and the L-pole plug portion 31 are located on the same side of the center line of the plug bracket 2, then, in order to facilitate crimping and riveting, accordingly, refer to Figure 5 As shown, in the height direction perpendicular to the latch bracket 2, the end of the L-pole latch portion 31 located at the housing 1 is lower than or flush with the center position of the L-pole wire-pressing hole 321. For example, the top end of the L-pole latch portion 31 is lower than or flush with the bottom end of the L-pole wire-pressing hole 321 close to the latch bracket 2.

[0132] In this way, the L-pole plug portion 31 and the L-pole terminal 32 are arranged up and down in the height direction, and their positions are staggered. Then, when using tools to crimp the L-pole plug portion 31 and the transition piece 66 of the overload protection module 6, and in crimping the power line and the L-pole crimping hole 321, there is no interference with each other.

[0133] In one example, the height relationship between the three terminals and the overload protection module 6 in the direction perpendicular to the latch bracket 2 is shown. Figure 6 As shown, the heights of the three terminals are all lower than the height of the overload protection module 6. For example, the middle position of the L-pole wire hole 321 in the height direction, the middle position of the N-pole terminal 42 in the height direction, and the middle position of the ground terminal 52 in the height direction are all equivalent to the middle position of the overload protection module 6 in the height direction. This height relationship ensures that the overload protection module 6 will not cause the height of the plug to be too high, and will not even change the height of the original plug.

[0134] For example, after the three terminals are riveted to the power cord, the height of the power cord above the three terminals from the pin bracket 2 is equivalent to the height of the overload protection module 6. Therefore, although the overload protection module 6 is introduced in this embodiment, the height of the plug will not be basically changed, so that the height of the plug in this embodiment is equivalent to the height of the plug without the overload protection module 6 in the prior art.

[0135] It should be pointed out that the wiring method between the above three terminals and the power cord can also be screw connection instead of crimping. In this case, the crimping hole can be replaced by a terminal post, and the power cord is inserted into the terminal post, and electrical connection is achieved by screwing the screws. Among them, this embodiment does not limit the structure used for wiring of the above three terminals, and the crimping hole is used as an example in the accompanying drawings.

[0136] In one example, after the three wires of the power cord are crimped to the three terminals, in order to facilitate the subsequent fixing of the housing, the power cord does not shake, accordingly, refer to Figure 2As shown, the latch bracket 2 has a power cord bracket 21, and the power cord bracket 21 has a wire outlet, wherein the center of the wire outlet is located on the center line of the latch bracket. In this way, the power cord passes through the clamp of the wire outlet, is inserted into the wire outlet, and extends outward, so that the power cord is restricted by the power cord bracket, and the power cord is not easy to shake in the subsequent assembly shell or the rubber-encapsulated shell.

[0137] The above are the structural features of the three latches. The structural features of the overload protection module 6 are introduced below.

[0138] (ii) Structural features of the overload protection module 6.

[0139] In one example, the overload protection module 6 includes a shell 61 and a deformable sheet 62, wherein the deformable sheet 62 is located in the shell 61, and the deformable sheet 62 is a metal sheet that can deform at high temperatures, for example, a bimetallic sheet formed by metal sheets of two materials, or a metal sheet formed by a memory alloy material.

[0140] like Figure 7 FIG. 6 is a schematic diagram of the structure of the deformable sheet 62. Figure 7 As shown, the deformable sheet 62 includes a fixed sheet 621 and a movable contact sheet 622 which are located opposite to each other. The fixed sheet 621 is fixed in the housing 61. Figure 8 As shown, the fixing piece 621 is fixed in the bottom shell of the housing 61 and is electrically connected to the L-pole plug portion 31 .

[0141] Continue to refer Figure 8 As shown, in order to electrically connect the fixing piece 621 and the L-pole plug part 31, the overload protection module 6 also includes a transition piece 66, one end of which extends into the housing 61 and is fixed in the housing 61 together with the fixing piece 621. For example, the portion of the transition piece 66 close to the first end is riveted and fixed to the fixing piece 621 of the deformation piece 62, and then inserted into the slot of the bottom shell of the housing 61. The second end of the transition piece 66 extends out of the housing 61 and is used to be riveted and connected to the L-pole plug part 31.

[0142] refer to Figure 8 As shown, the moving contact piece 622 is located in the housing 61 and is positioned opposite to the stationary contact piece 323 of the L-pole terminal 32 so as to be combined with and separated from the stationary contact piece 323 .

[0143] For example, refer to Figure 8 As shown, when the deformable piece 62 is deformed, the movable contact piece 622 is ejected away from the stationary contact piece 323 , thereby being separated from the stationary contact piece 323 . When the deformable piece 62 is restored, the movable contact piece 622 is restored to be combined with the stationary contact piece 323 .

[0144] As described above, the deformable sheet 62 may be a bimetallic sheet. In order to enable the deformation of the deformable sheet 62 to enable the moving contact sheet to be combined with or separated from the stationary contact sheet, accordingly, reference is made to Figure 8 As shown, the deformable sheet 62 includes a first metal sheet and a second metal sheet, wherein the thermal expansion coefficient of the first metal sheet is greater than the thermal expansion coefficient of the second metal sheet, and the moving contact point of the moving contact sheet 622 is located on the first metal sheet.

[0145] Continue to refer Figure 8 As shown, when the temperature changes, because the thermal expansion coefficient of the first metal sheet is greater than that of the second metal sheet, the deformation of the first metal sheet is greater than that of the second metal sheet, but the first metal sheet and the second metal sheet are always fixed together, so that the first metal sheet with a larger deformation bends toward the second metal sheet with a smaller deformation, and the fixed sheet 621 of the deformable sheet 62 is in a fixed state, so the moving contact sheet 622 will bounce away from the static contact sheet 323 and separate from the static contact sheet 323.

[0146] In one example, since the thickness of the deformable sheet 62 is relatively thin (e.g., less than 0.2 mm), the rigidity of the deformable sheet 62 is relatively small, and it is easy to cause the moving contact sheet 622 to separate from the stationary contact sheet 323 when the temperature changes slightly. For this reason, the portion between the fixed sheet 621 and the moving contact sheet 622 can be a pot sheet 623, which protrudes toward the direction of the second metal sheet, that is, bulges in the direction opposite to the moving contact point, and the portion of the pot sheet 623 close to the edge is a plane. For example, the pot sheet 623 bulges in an arc shape toward the direction of the second metal sheet, and is pot-shaped, which can improve the overall rigidity of the deformable sheet 62.

[0147] In this way, when the temperature changes, although both the first metal sheet and the second metal sheet will deform, and the deformation of the first metal sheet is greater than that of the second metal sheet, the deformation force of the first metal sheet will not cause the movable contact sheet to bounce open because of the greater rigidity of the deformable sheet. When the temperature exceeds the set threshold, the deformation force of the first metal sheet will further increase, and the deformation force of the first metal sheet will increase to overcome the rigidity of the entire deformable sheet, causing the movable contact sheet to bounce open, and the movable contact sheet and the static contact sheet will separate.

[0148] In one example, the overload protection module may further include a reset mechanism, which is used to control the combination of the moving contact piece 622 and the stationary contact piece 323 after the deformation piece 62 is restored. Fig. 9 As shown, the reset mechanism includes a push rod 63 and an elastic member 64, wherein the elastic member 64 may be a structural member with telescopic elasticity, and a spring is used as an example in the figure.

[0149] In one example, the push rod 63 and the elastic member 64 are both assembled in the housing 61, and the elastic member 64 is compressed between the push rod 63 and the bottom of the housing 61, referring to Fig. 9As shown, the rod portion 631 of the push rod 63 has a spacer 632 at its first side and near the bottom. When the movable contact piece 622 and the stationary contact piece 323 are in a combined state, the spacer 632 is located below the movable contact piece 622 near the bottom of the housing 61. When the movable contact piece 622 and the stationary contact piece 323 are in a separated state, the push rod 63 moves upward under the action of the elastic member 64, causing the spacer 632 to move to be sandwiched between the movable contact piece 622 and the stationary contact piece 323. When resetting is required, the push rod 63 is pressed to move the push rod 63 downward, and the spacer 632 moves downward to be located below the movable contact piece 622 near the bottom of the housing 61, and is no longer sandwiched between the movable contact piece and the stationary contact piece, and the movable contact piece and the stationary contact piece are combined again.

[0150] refer to Fig. 9 As shown, the bottom of the rod 631 has an extension portion 633 extending along the length direction, and the spacer 632 is located on a first side of the extension portion 633. Then, when the moving contact piece 622 and the stationary contact piece 323 are in a combined state, refer to Fig.12 As shown, the spacer 632 is located below the movable contact piece 622 near the bottom of the housing 61 , and when the movable contact piece 622 and the stationary contact piece 323 are in a separated state, the spacer 632 is sandwiched between the movable contact piece 622 and the stationary contact piece 323 .

[0151] In one example, the elastic member 64 is generally installed in the groove, for example, referring to Fig.10 and Fig.11 As shown, the housing 61 has a mounting groove 611 , the notch of the mounting groove 611 faces away from the bottom of the housing 61 , and the elastic member 64 is assembled in the mounting groove 611 .

[0152] Continue to refer Fig.10 As shown, the groove wall of the installation groove 611 has a first strip opening 6111 extending along the groove depth direction and penetrating to the groove opening, Fig.11 As shown, the bottom end of the rod portion 631 of the push rod 63 extends into the mounting groove 611 to compress the elastic member 64, the extension portion 633 is located in the first strip opening 6111, and the spacer 632 is located outside the mounting groove 611. Thus, the push rod 63 is slidably assembled in the mounting groove 611.

[0153] Continue to refer Fig.10 As shown, the second side of the rod portion 631 of the push rod 63 has a stopper 634, and the stopper 634 also extends along the length direction of the rod portion 631. Then, the groove wall of the installation groove 611 also has a second strip opening 6112 along the groove depth direction and penetrating to the groove opening, referring to Fig.11 As shown, the limiting piece 634 is located in the second strip-shaped opening 6112 .

[0154] In one example, reference Fig.11As shown, the first side and the second side of the push rod 63 can be the front and rear sides distributed along the length direction of the overload protection module 6, wherein the length direction of the overload protection module 6 is parallel to the center line of the latch bracket 2. Then, the spacer 632 and the limiter 634 of the push rod 63 are distributed front and rear along the length direction of the overload protection module, which is conducive to reducing the width of the overload protection module.

[0155] Continue to refer Fig.11 As shown, the rod portion 631 of the push rod 63 and the groove wall of the mounting groove 611 both have a tangent plane, and the tangent plane faces away from the L-pole terminal 32. Fig.12 As shown, the deformation piece 62 is located between the shell wall and the tangent plane of the shell 61.

[0156] In one example, reference Figure 2 As shown, the top end of the push rod 63 extends out of the housing 61 in the left-right direction. Figure 8 As shown, the deformable sheet 62 is also centrally located in the housing 61 in the left-right direction. Fig. 9 As shown, the rod portion 631 of the push rod 63 may include a first rod portion 635 and a second rod portion 636, wherein the first rod portion 635 and the second rod portion 636 are connected in a direction parallel to the axis, and the first rod portion and the second rod portion are offset in the radial direction, that is, the axes of the first rod portion 635 and the second rod portion 636 are parallel but do not overlap.

[0157] Among them, the extension portion 633 and the limiting piece 634 are both connected to the second rod portion 636 and extend in a direction away from the first rod portion 635. The cutting plane on the rod portion 631 is specifically the first rod portion 635 having a cutting plane. The diameter of the second rod portion 636 is smaller than the slot diameter of the mounting groove 611, and the diameter of the first rod portion 635 is larger than the slot diameter of the mounting groove 611.

[0158] So, reference Fig.11 As shown, the first rod portion 635 is located above the mounting groove 611, and the second rod portion 636 can extend into the mounting groove 611 to press the elastic member 64 in the mounting groove 611. Fig.12 As shown, the deformation piece 62 is located at the tangent plane of the first rod portion 635 and below the first rod portion 635, thereby achieving that the first rod portion 635 of the push rod 63 is centered in the shell 61 in the left-right direction, the top end of the push rod 63 extends out of the shell 61 in the left-right direction, and the deformation piece 62 is also centered in the shell 61 in the left-right direction.

[0159] As described above, the elastic member 64 is compressed between the push rod 63 and the bottom of the shell 61. Then, the push rod 63 moves upward toward the upper cover of the shell 61 by means of the elastic member 64, while the push rod 63 moves downward toward the bottom of the shell 61 by pressing by the user.

[0160] Then, in one solution, we can refer to Figure 1 As shown, the top end of the push rod 63 is exposed, for example, referring to Figure 1 As shown, the top end of the push rod 63 is flush with the upper surface of the housing 1 . Of course, the top end of the push rod 63 may also extend out of the upper surface of the housing 1 .

[0161] In another embodiment, the top end of the push rod 63 may also be located so as not to be exposed. For example, the top end of the push rod 63 may be flush with or extend out of the shell 61 of the overload protection module 6, but may be located inside the outer shell 1. When the user needs to press the push rod 63 to reset it, the upper cover of the outer shell 1 may be opened to press the push rod 63.

[0162] In this embodiment, whether the top end of the push rod 63 is exposed from the housing 1 is not specifically limited. For the convenience of description, the exposed top end is shown in the accompanying drawings.

[0163] In one example, reference Fig.11 As shown, the spacer 632 of the push rod 63 is located below the static contact piece 323, and the elastic member needs to be in a compressed state between the bottom of the shell 61 and the push rod 63. Therefore, during assembly, if the elastic member is first installed in the mounting groove 611 and then the push rod 63 is installed, the elastic member will push the push rod 63 away, causing the push rod 63 to move upward, and the upward movement of the push rod 63 will push the L-pole terminal 32 upward, making it difficult to position the L-pole terminal 32 in the bottom shell of the shell 61, thereby increasing the difficulty of assembly.

[0164] To this end, the elastic member can be installed into the housing 61 from the bottom of the housing 61 last in the assembly sequence. In order to realize the installation of the elastic member from the bottom of the housing 61, accordingly, Fig.13 As shown, the bottom of the housing 61 has an opening 612 at a position corresponding to the mounting groove 611 , and the opening 612 is communicated with the mounting groove 611 . The opening 612 is used to allow the elastic member 64 to be installed in the mounting groove 611 .

[0165] In order to prevent the elastic member 64 from falling off from the opening 612, accordingly, Fig.14 As shown, the overload protection module further includes a sealing plug 65 , which is located in the opening 612 with interference fit, and the elastic member 64 and the sealing plug 65 are in abutment with each other.

[0166] In one example, in order to allow the sealing plug 65 to be inserted into the opening 612 by interference fit, the sealing plug 65 can be compressed so as to be inserted into the opening 612. For example, the sealing plug 65 can be a rubber plug, which has a certain elasticity and can be compressed so as to be inserted into the opening 612. Fig.14As shown, the inner end face of the sealing plug 65 facing the mounting groove 611 has a groove 651, and the elastic member 64 abuts against the inner end face between the groove wall of the groove 651 and the outer wall of the sealing plug. The groove 651 can shrink the sealing plug 65 when it is inserted into the opening, so that it is inserted into the opening with interference fit.

[0167] In one example, if the sealing plug 65 is only inserted into the opening 612, and the hole height of the opening 612 is equal to the wall thickness of the bottom shell, the sealing plug 65 is inserted into the opening 612 with a smaller hole height, and under the abutment of the elastic member 64 in a compressed state, the sealing plug 65 is easy to fall off from the opening 612.

[0168] To this end, continue to refer to Fig.13 and Fig.14 As shown, the bottom outer surface of the shell 61 is provided with an annular convex rib 613 along the opening 612 , and the annular convex rib 613 is used to extend the hole height of the opening 612 .

[0169] In order to enable the sealing plug 65 to be inserted into the inner space of the annular rib 613, Fig.13 As shown, the annular rib 613 has a plurality of openings 6131 that penetrate the thickness and height of the annular rib 613 , and these openings 6131 are used to reduce the rigidity of the annular rib 613 , and these openings 6131 can be evenly arranged along the annular direction. Then, when the sealing plug 65 is inserted, the annular rib 613 is stretched open along the radial direction, so that the sealing plug 65 is inserted into the opening 612 and the annular rib 613 .

[0170] The height direction of the annular rib 613 is perpendicular to the bottom of the shell 61 , and the thickness direction is parallel to the radial direction of the opening 612 .

[0171] In one example, since the elastic member in a compressed state abuts against the sealing plug 65, the sealing plug 65 may fall off from the opening 612 and the ring rib 613 under the action of the elastic member. Therefore, in order to prevent the sealing plug 65 from falling off from the ring rib 613 and the opening, accordingly, Fig.14 As shown, the aperture of the opening 612 and the inner diameter of the annular rib 613 gradually increase from the outside of the shell 61 to the inside of the shell 61 in the axial direction of the opening 612, and the diameter of the sealing plug 65 gradually increases from the outside of the shell 61 to the inside of the shell 61 in the axial direction of the sealing plug 65. Fig.14 As shown, the cross-sectional shape of the sealing plug is an inverted trapezoid, and the sealing plug 65 is sealed in the annular rib 613 and the opening 612 like a barb, so that the sealing plug is not easy to fall off.

[0172] So, reference Fig.14As shown, the sealing plug 65 is subjected to the downward force of the elastic member 64 and the upward supporting force of the annular rib 613. The annular rib 613 acts to resist the elastic member, so that the sealing plug is not easy to fall off.

[0173] In one example, in order to smoothly insert the sealing plug 65 into the annular rib 613 and the opening, accordingly, refer to Fig.14 As shown, the annular rib 613 has a first guide structure at the opening away from the mounting groove 611, and the sealing plug 65 has a second guide structure at one end close to the mounting groove. Then, with the cooperation of the first guide structure and the second guide structure, and with the annular rib 613 being radially stretched, the sealing plug 65 is interference fit in the opening 612 and the annular rib 613.

[0174] In one example, reference Fig.13 As shown, since the annular rib 613 protrudes relative to the bottom outer surface of the housing 61, in order to stably fix the overload protection module on the latch bracket, the inner surface of the latch bracket 2 has a recessed groove 22 (see Fig.15 As shown), the overload protection module is fixed on the latch bracket, and the annular rib 613 is located in the sink 22, so that the bottom outer surface of the overload protection module can be stably fitted with the inner surface of the latch bracket 2.

[0175] The above are the structural features of the overload protection module 6 . The following introduces the assembly process of the overload protection module 6 based on the features of the overload protection module 6 .

[0176] Step 1: Install the deformation sheet 62, transition sheet 66 and push rod 63 into the bottom shell of the housing 61. Fig.16 As shown, the push rod 63 can be first installed in the bottom shell of the housing 61, wherein the push rod 63 is pushed to the bottom in the bottom shell, and the bottom of the spacer 632 of the push rod 63 contacts the bottom surface of the bottom shell. Then the whole body after the deformation piece 62 and the transition piece 66 are fixed is installed in the bottom shell. The fixing method of the fixing piece 621 of the deformation piece 62 and the transition piece 66 can be welding (such as resistance welding) or riveting. Fig.17 As shown, the fixed plate 621 and the transition plate 66 in a fixed relationship are stuck in the slot of the bottom shell together, the moving contact plate 622 is located above the partition plate 632, the pot piece 623 is located at the cutting plane of the push rod 63 and the mounting groove 611, and the pot piece 623 is a pot-shaped or bowl-shaped protrusion facing the direction away from the slice surface.

[0177] It should be pointed out that, since the thickness of the deformation piece 62 is relatively thin and has a certain elasticity, the deformation piece 62 and the transition piece 66 can be first installed into the bottom shell as a whole, and then the push rod 63 can be installed into the bottom shell. Then, when installing the push rod 63, the moving contact piece 622 needs to be pried apart so that the partition piece 632 of the push rod 63 moves down to contact the inner surface of the bottom shell.

[0178] Step 2: After the deformation piece 62, transition piece 66 and push rod 63 are installed into the bottom shell of the housing 61, the L-pole terminal 32 is installed into the bottom shell. Fig.17 And refer to Fig.18 As shown, the connecting piece 322 of the L-pole terminal 32 is inserted into the slot of the bottom shell. After being inserted to the bottom, the static contact on the static contact piece 323 of the L-pole terminal 32 is combined with the moving contact on the moving contact piece 622 of the deformation piece 62, and the L-pole wire pressing hole 321 of the L-pole terminal 32 is located outside the shell 61.

[0179] Step three, such as Fig.19 As shown, the upper cover of the housing 61 is fixed to the bottom shell. For example, the top end face of the bottom shell has a fixing hole, and the bottom end face of the upper cover has a fixing column. The bottom shell and the upper cover are fixedly connected with each other by the cooperation of the fixing hole and the fixing column. Of course, the top end face of the bottom shell may also have a fixing column, and the bottom end face of the upper cover may have a fixing hole. In addition, the bottom shell and the upper cover may also be fixedly connected by a snap-fit ​​connection.

[0180] Step 4: Fig. 20 As shown, the elastic member 64 is installed into the mounting groove 611 inside the housing 61 through the opening 612 on the bottom surface of the housing 61. Fig.19 and Fig. 20 As shown, after the upper cover and the bottom shell of the shell 61 are fixedly connected, the overload protection module 6 is turned over so that the bottom of the shell 61 faces upward, exposing the opening 612 at the bottom, and then the elastic member 64 is installed in the installation groove 611 connected to the opening 612.

[0181] Step 5: Fig.21 As shown, the sealing plug 65 is inserted into the inner space of the annular rib 613 and the opening 612 so that the elastic member 64 is compressed between the sealing plug 65 and the push rod 63, and the overload protection module 6 is assembled.

[0182] After the assembly, the overload protection module 6 can be referred to Fig. 22 As shown, along the length direction of the upper cover of the shell 61 , the overload protection module 6 has lower front and rear ends and a higher middle part. This is due to the structural features of the deformation sheet 62 and the push rod 63 .

[0183] refer to Fig.23As shown, the pot piece 623 of the deformation piece 62 is arranged in the middle position of the bottom shell, and the height of the pot piece 623 is higher than the movable contact piece and the fixed piece at both ends. In addition, the top of the push rod 63 needs to pass through the upper cover and the shell 1, so the rod part of the push rod 63 is also relatively high, and the rod part of the push rod 63 is also in the middle position. Therefore, the upper cover of the shell 61 is higher in the middle position and lower at both ends.

[0184] After the overload protection module 6 is assembled, the bottom of the overload protection module 6 is fixed to the latch bracket 2. For example, Fig.24 As shown, the inner surface of the latch bracket 2 has a fixing column, such as Fig.21 As shown, the bottom of the housing 61 has a fixing hole, and the fixing column extends into the fixing hole to achieve positioning and fixing. Of course, it can also be that the inner surface of the latch bracket 2 has a fixing hole, and the bottom of the overload protection module 6 has a fixing column.

[0185] refer to Fig.23 As shown, the bottom shell and the upper cover of the overload protection module are fixed by the fixing column and the fixing hole, refer to Fig.24 As shown, the fixation between the overload protection module 6 and the latch bracket 2 is also achieved through the cooperation of the fixing column and the fixing hole. In the fixation achieved through the cooperation of the fixing column and the fixing hole, in order to make the fixing column insert into the fixing hole more smoothly, the fixing column can be a cylinder and the fixing hole can be a square hole. Compared with the cooperation of the cylinder and the round hole, the four corners of the square hole can absorb the processing tolerance and the assembly tolerance, making it easier for the cylinder to be inserted into the square hole.

[0186] In one example, after the overload protection module 6 is fixed on the latch bracket 2, it can be assembled in the housing 1 as a whole to form a plug. The housing 1 can be a housing including a base and a cover, and the overload protection module 6 and the latch bracket 2 are located in a chamber formed by the base and the cover. Alternatively, the housing 1 can also be wrapped around the overload protection module 6 and the latch bracket 2 by a rubber encapsulation process.

[0187] In one example, the plugs are classified by style, generally into simple style and ordinary style, such as Figure 1 The surface of the plug housing 1 is relatively flat, making the plug look simple and clean. This plug belongs to a simple style, such as Fig.25 The plug shown has an uneven surface of its housing 1, which is a common style.

[0188] For a simple style plug, the thickness of the plug is relatively thin, and its shell 1 has cutting planes on the left and right sides along the center line. The two cutting planes are symmetrically distributed, which is convenient for the user to hold the plug to plug and unplug the plug.

[0189] For ordinary plugs, the thickness of the plug is relatively thick. In order to adapt to this high-thickness plug, such as Fig.26 As shown, the top of the housing 61 of the overload protection module 6 has a sleeve 614 for increasing the height of the plug, the push rod 63 is located in the sleeve 614, and the top end of the push rod 63 extends out of the sleeve 614, refer to Fig.25 As shown, the top end of the push rod 63 may also extend out of the housing 1 and be exposed for the user to press.

[0190] refer to Fig.24 As shown, for the simple style plug, the top of the shell 61 also has a sleeve, but because the simple style plug is relatively thin, the height of the sleeve of the simple style plug is smaller than the height of the sleeve of the ordinary style plug.

[0191] Among them, for ordinary style plugs without overload protection modules, the shell 1 will have bulges on the left and right sides of the center line. The reason for the bulges is that there is an N-pole terminal on the left side of the center line of the pin bracket 2 and an L-pole terminal on the right side. The L-pole terminal and the N-pole terminal are relatively high, so a bulge will be formed on the shell 1 at the position corresponding to the N-pole terminal, and a bulge will also be formed at the position corresponding to the L-pole terminal.

[0192] The common style plug with overload protection module in this solution is referenced Figure 2 As shown, there is a N-pole terminal on the left side of the center line of the plug, so there will still be a bulge on the left side of the shell, but continue to refer to Figure 2 As shown in FIG. 1 , the portion of the L-pole plug portion on the right side of the center line of the plug extending into the housing is relatively small, so the housing 1 does not need to form a bulge at the position corresponding to the L-pole plug portion 31. Figure 2 As shown, the L-pole terminal 32 is relatively high, so the housing 1 will form a bulge at the position corresponding to the L-pole terminal 32. It can be seen that the ordinary style plug in this embodiment still has bulges 11 on the left and right sides of its housing (refer to Fig.25 As shown in the figure, in order to enhance the aesthetics, the bulges 11 on the left and right sides of the shell 1 can be symmetrical about the center line of the plug. Then, the bulge on the shell of a common plug with an overload protection module is longer in the front-to-back direction than the bulge on the shell of a common plug without an overload protection module.

[0193] This is because, for a common plug without an overload protection module, the bulge on the shell only needs to cover the N-pole terminal, while for a common plug with an overload protection module, the bulge on the shell needs to cover both the L-pole plug portion 31 and the L-pole terminal 32. Figure 2 As shown, the L-pole plug portion 31 and the L-pole terminal 32 are spaced apart in the front-to-rear direction.

[0194] In the disclosed embodiment, an overload protection module is integrated on the basis of the original plug, so that the plug becomes a pot protection plug. When the current in the circuit where the plug is located is too large, the overload protection module can disconnect the electrical connection between the L-pole terminal and the L-pole plug part, thereby improving the safety of the plug.

[0195] Moreover, the overload protection module is integrated into the plug, so there is no need to arrange the overload protection module on the mobile socket connected to the plug, and thus more sockets can be arranged on the mobile socket, or the mobile socket can be made smaller.

[0196] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A plug, characterized in that: It comprises a housing (1), a latch bracket (2), an L-pole latch (3), an N-pole latch (4) and an overload protection module (6), wherein the L-pole latch (3) comprises an L-pole latch portion (31) and an L-pole wiring terminal (32), and the N-pole latch (4) comprises an N-pole latch portion (41) and an N-pole wiring terminal (42); The latch bracket (2) is located in the housing (1), the N-pole latch (4) is located on a first side of a center line of the latch bracket (2), and the N-pole latch portion (41) extends out of the housing (1), with one end located in the housing (1) and fixedly connected to the N-pole terminal (42); The L-pole plug portion (31) is located on the second side of the center line of the plug bracket (2) and extends out of the housing (1), with one end located in the housing (1), and the L-pole terminal (32) is located in the housing (1); The overload protection module (6) is located between the N-pole terminal (42) and the L-pole plug portion (31), and is used to connect the electrical connection between the L-pole plug portion (31) and the L-pole terminal (32) when the internal temperature is not higher than a set threshold, and to disconnect the electrical connection between the L-pole plug portion (31) and the L-pole terminal (32) when the internal temperature is higher than the set threshold.

2. The plug according to claim 1, characterized in that: The L-pole terminal (32) is located on the second side of the center line of the plug bracket (2), and is farther away from the power line outlet of the plug than the L-pole plug portion (31).

3. The plug according to claim 1, characterized in that: The plug further comprises a grounding plug (5), wherein the grounding plug (5) comprises a grounding plug portion (51) and a grounding terminal (52); The ground electrode plug (5) is located on the center line of the plug bracket (2), and the ground electrode plug portion (51) extends out of the housing (1), with one end located in the housing (1) and fixedly connected to the ground electrode terminal (52); The overload protection module (6) is arranged between the N-pole terminal (42) and the L-pole plug portion (31), along the center line of the plug bracket (2), and is located between the ground terminal (52) and the power line outlet of the plug.

4. The plug according to claim 1, characterized in that: The L-pole terminal (32) comprises an L-pole wire pressing hole (321), a connecting piece (322) and a static contact piece (323), wherein the connecting piece (322) is connected between the L-pole wire pressing hole (321) and the static contact piece (323); The connecting piece (322) is fixed on the shell wall of the shell (61) of the overload protection module (6), and the static contact piece (323) is located in the shell (61) of the overload protection module (6) and is electrically connected to the moving contact piece (621) of the overload protection module (6), and the L-pole wire pressing hole (321) is located outside the shell (61) of the overload protection module (6).

5. The plug according to claim 4, characterized in that: The L-pole wire pressing hole (321), the connecting piece (322) and the static contact piece (323) are integrally formed; The L-pole wire pressing hole (321) is a cylindrical structure rolled up toward one side of the connecting piece (322) compared to the connecting piece (322), and the static contact piece (323) is bent toward one side of the connecting piece (322) compared to the connecting piece (322).

6. The plug according to claim 5, characterized in that: The connection between the connecting piece (322) and the L-pole wire pressing hole (321) is provided with an insertion hole (324), and the end of the L-pole wire pressing hole (321) along the rolling direction is provided with an insertion piece (325) extending along the rolling direction, and the insertion piece (325) extends into the insertion hole (324).

7. The plug according to claim 5, characterized in that: The hole wall of the L-pole wire pressing hole (321) has at least one notch (326) at a position close to the end of the L-pole wire pressing hole (321) along the rolling direction, and the notch (326) is used to reduce the strength of the hole wall of the L-pole wire pressing hole (321) to facilitate crimping with the L-pole wire of the power line.

8. The plug according to claim 4, characterized in that: The L-pole wire pressing hole (321) and the static contact piece (323) are located on different sides of the connecting piece (322).

9. The plug according to claim 4, characterized in that: In a height direction perpendicular to the latch bracket (2), the end of the L-pole latch (31) located on the housing (1) is lower than or flush with the bottom end of the L-pole wire pressing hole (321) facing the latch bracket (2).

10. The plug according to claim 1, characterized in that The overload protection module (6) comprises a housing (61), a deformable sheet (62) and a reset mechanism, wherein the deformable sheet (62) comprises a fixed sheet (621) and a movable contact sheet (622) which are positioned opposite to each other; The deformable sheet (62) is located in the housing (61), and the fixed sheet (621) is fixed in the housing (61) and electrically connected to the L-pole plug portion (31), and the movable contact sheet (622) is used to electrically connect to the stationary contact sheet (323) of the L-pole terminal (32); The overload protection module (6) is used to, when the internal temperature is higher than a set threshold, deform the deformable sheet (62) so that the movable contact sheet (622) is retracted relative to the stationary contact sheet (323); when the internal temperature is not higher than the set threshold, reset the deformable sheet (62) and the reset mechanism so that the movable contact sheet (622) and the stationary contact sheet (323) are combined.

11. The plug according to claim 10, characterized in that: The deformable sheet (62) is a mutually fixed bimetallic sheet, comprising a first metal sheet and a second metal sheet, the thermal expansion coefficient of the first metal sheet is greater than the thermal expansion coefficient of the second metal sheet, and the moving contact point on the moving contact sheet (622) is located on the surface of the first metal sheet.

12. The plug according to claim 10, characterized in that The deformable sheet (62) comprises a pot sheet (623) connected between the fixed sheet (621) and the movable contact sheet (622), and the pot sheet (623) bulges in a direction away from the movable contact point on the movable contact sheet.

13. The plug according to claim 10, characterized in that The reset mechanism comprises a push rod (63) and an elastic member (64); The push rod (63) and the elastic member (64) are both assembled in the housing (61), and the elastic member (64) is compressed between the push rod (63) and the bottom of the housing (61), and a spacer (632) is provided on the first side of the push rod (63) and at a position close to the bottom; When the moving contact piece (622) and the stationary contact piece (323) are in a combined state, the partition piece (632) is located below the moving contact piece (622) near the bottom of the housing (61); when the moving contact piece (622) and the stationary contact piece (323) are in a separated state, the partition piece (632) is sandwiched between the moving contact piece (622) and the stationary contact piece (323).

14. The plug according to claim 13, characterized in that The bottom of the rod portion (631) of the push rod (63) has an extension portion (633) extending along the length direction, and the spacer (632) is located on a first side of the extension portion (633).

15. The plug according to claim 14, characterized in that The bottom of the housing (61) is provided with a mounting groove (611), the notch of the mounting groove (611) faces away from the bottom of the housing (61), and the elastic member (64) is assembled in the mounting groove (611); The groove wall of the installation groove (611) has a first strip-shaped opening (6111) extending along the groove depth direction and penetrating to the groove mouth. The bottom of the rod portion (631) of the push rod (63) extends into the installation groove (611) to compress the elastic member (64). The extension portion (633) is located in the first strip-shaped opening (6111), and the spacer (632) is located outside the installation groove (611).

16. The plug according to claim 14, characterized in that The second side of the push rod (63) has a limiting plate (634), and the groove wall of the installation groove (611) also has a second strip-shaped opening (6112) along the groove depth direction and penetrating to the groove mouth, and the limiting plate (634) is located in the second strip-shaped opening (6112).

17. The plug according to claim 16, characterized in that The first side and the second side of the push rod (63) are front and rear sides distributed along the length direction of the overload protection module (6), wherein the length direction of the overload protection module (6) is parallel to the center line of the latch bracket (2).

18. The plug according to claim 15, characterized in that The rod portion (631) of the push rod (63) and the groove wall of the installation groove (611) both have a cutting plane, the cutting plane is opposite to the L-pole terminal (32), and the deformation sheet (62) is located between the shell wall of the shell (61) and the cutting plane.

19. The plug according to claim 15, characterized in that The bottom of the shell (61) has an opening (612) at a position corresponding to the mounting groove (611); the opening (612) is connected to the mounting groove (611); and the opening (612) is used to allow the elastic member (64) to be installed in the mounting groove (611).

20. The plug according to claim 19, characterized in that The overload protection module further comprises a sealing plug (65), the sealing plug (65) is interference fit in the opening (612), and the elastic member (64) and the sealing plug (65) are in abutment with each other.

21. The plug according to claim 20, characterized in that An annular convex rib (613) is provided on the outer surface of the bottom of the shell (61) along the opening (612), and the annular convex rib (613) has a plurality of openings that penetrate the thickness and height of the annular convex rib (613); When the annular convex rib is radially expanded and matched, the sealing plug (65) is interference-located between the opening (612) and the annular convex rib (613); Wherein, the height direction of the annular convex rib (613) is perpendicular to the bottom of the shell (61), and the thickness direction is parallel to the radial direction of the opening (612).

22. The plug according to claim 19, characterized in that The diameters of the opening (612) and the annular rib (613) gradually increase from the outside of the shell (61) to the inside of the shell (61) in the axial direction of the opening (612); The diameter of the sealing plug (65) gradually increases from the outside of the shell (61) to the inside of the shell (61) in the axial direction of the sealing plug (65).

23. The plug according to claim 21, characterized in that The annular convex rib (613) has a first guide structure at an opening away from the mounting groove (611), and the sealing plug (65) has a second guide structure at an end close to the mounting groove; With the cooperation of the first guide structure and the second guide structure, and with the annular convex rib (613) being radially expanded, the sealing plug (65) is interference-fittedly located in the opening (612) and the annular convex rib (613).

24. The plug according to claim 21, characterized in that The inner surface of the latch bracket (2) has a recessed groove, and the annular rib (613) is located in the recessed groove.

25. The plug according to claim 20, characterized in that The sealing plug (65) has a groove (651) on its inner end surface facing the mounting groove (611), and the elastic member abuts against the inner end surface between the groove wall of the groove (651) and the outer wall of the sealing plug.

26. The plug according to claim 13, characterized in that The top of the push rod (63) passes through the housing (61) of the overload protection module (6) and the outer shell (1) of the plug in sequence so as to be exposed outside the outer shell (1).

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