Leakage protection device

Abstract

The present invention provides a leakage protection device, including a shell and a core component arranged in the shell, the core component including a control circuit board, and an input component and an output component coupled to the control circuit board. The leakage protection device includes a reset component, a trip component, and a cut-off component that makes the reset component and the trip component cooperate, and the cut-off component is configured so that: when the input component is powered on, the cut-off component connects the reset component and the trip component after operating the reset component, and prompts the trip component to connect the input component and the output component; when the input component is powered off or a leakage fault occurs, the cut-off component cuts off the connection between the reset component and the trip component, and prompts the trip component to disconnect the input component and the output component. The leakage protection device of the present invention has good safety and high reliability, and at the same time improves the internal structural layout of the product, greatly reduces the volume of the product, and is particularly suitable for compact application environments.

Description

Technical Field

[0001] The present invention generally relates to the electrical field, and in particular to a leakage protection device. Background Art

[0002] As people's awareness of electricity safety continues to improve, the use of leakage protection devices is becoming more and more widespread. The application fields and usage scenarios are also continuously increasing. Due to the limitations of the mechanical structure, the existing leakage protection devices are relatively large in size. Taking the leakage protection plug as an example, when it needs to be used with some small household appliances (such as hair dryers, dryers, etc.), it will cause the overall appearance of the product to be inconsistent, reducing the overall aesthetics of the product. In addition, due to the limitations of the principle and structure of the existing leakage protection plug, when the power neutral (N) line is disconnected, the switch contacts of the leakage protection plug are still in the closed position, and the input live (L) line and neutral line are still connected. However, since the leakage protection plug has lost the ability to detect leakage and cut off the power supply, there are serious safety hazards.

[0003] Therefore, it is necessary to develop and design improved leakage protection devices to compensate for these defects. Summary of the invention

[0004] The purpose of the present invention is to provide a leakage protection device to further improve the safety of use and to propose improvements based on the above-mentioned factors that need to be considered.

[0005] To this end, according to the present invention, there is provided a leakage protection device, comprising a shell and a core component arranged in the shell, the core component comprising a control circuit board, and an input component and an output component coupled to the control circuit board, wherein the leakage protection device comprises a reset component, a trip component, and a cut-off component that enables the reset component and the trip component to cooperate, and the cut-off component is configured so that: when the input component is powered on, the cut-off component connects the reset component and the trip component after operating the reset component, and prompts the trip component to connect the input component and the output component; when the input component is powered off or has a leakage fault, the cut-off component cuts off the connection between the reset component and the trip component, and prompts the trip component to disconnect the input component and the output component.

[0006] The present invention provides a disconnection component to ensure power connectivity between the input and output ends when in normal reset use, and can automatically disconnect the input and output ends in the event of a power outage or leakage fault, thereby improving the safety performance of the leakage protection device and having high reliability.

[0007] According to the above technical concept, the present invention may further include any one or more of the following optional forms.

[0008] In certain optional forms, the cut-off assembly includes a locking plate and an elastic biasing member, wherein the locking plate is mounted on the trip assembly and is switchable between an initial state, a connected state, and a cut-off state, wherein: in the initial state, the locking plate is biased toward the reset assembly in a first direction by the elastic biasing member; in the connected state, the locking plate is biased in the first direction and is engaged with the reset assembly; in the cut-off state, the locking plate pivots around the trip assembly in a second direction opposite to the first direction and is disengaged from the reset assembly.

[0009] In certain optional forms, the trip assembly includes a trip coil, a magnetically conductive core cooperating with the trip coil, and a trip device that causes the input assembly and the output assembly to be connected or disconnected, and the locking plate is configured to be driven by the magnetically conductive core to be biased along the first direction, and driven by the trip device to pivot along the second direction.

[0010] In some optional forms, the locking plate is provided with a notch for the magnetic core to be inserted into, and the notch is configured to bias the locking plate along the first direction when the magnetic core moves along the tripping coil. The locking plate also includes a hook suitable for engaging with a bayonet provided on the reset assembly.

[0011] In some optional forms, the elastic biasing member is a spring leaf, including a spring foot fixed to the trip coil and a central recess suitable for snapping into the permeable core. In the initial state, the elastic biasing member applies a force to the permeable core away from the reset assembly.

[0012] In some optional forms, the locking plate further comprises a locking plate shaft head, and the locking plate shaft head is adapted to be pivotally connected to the releaser so as to move and pivot with the releaser.

[0013] In some optional forms, the trip assembly includes a magnetic conductive plate, which is mounted on the trip coil and has a magnetic conductive plate hole for the magnetic conductive core to pass through, and the magnetic conductive plate hole is concentric with the coil inner hole of the trip coil. When the input assembly is powered on and the reset assembly is operated, the end face of the magnetic conductive core is adsorbed on the inner surface of the magnetic conductive plate.

[0014] In some optional forms, the leakage protection device includes an intermediate bracket for accommodating and assembling the input component, the output component and the movement component, wherein the releaser is provided with a limiting guide bar, and the limiting guide bar cooperates with a slide groove provided on the intermediate bracket to limit the movement direction and movement range of the releaser.

[0015] In some optional forms, the leakage protection device includes a status display mechanism, which includes an indicator sheet connected to the release and is suitable for being observed from outside the housing.

[0016] In some optional forms, the reset assembly includes a reset button protruding from the outside of the shell, and the leakage protection device includes a button cap made of elastic insulating material, which is suitable for extending out of the shell and has a reset cap covering the reset button.

[0017] In some optional forms, the leakage protection device includes a test component, the test component includes a test button formed on the button cap, the test button is connected to a button pin, and the button pin can be switched between an on state and an off state through the operation of the test button, wherein: in the on state, the test button is pressed so that the button pin is connected to the test contact on the control circuit board; in the off state, the test button is elastically reset to disconnect the button pin from the test contact on the control circuit board.

[0018] In some optional forms, the leakage protection device includes an inner cover, which is made of a transparent insulating material and is arranged between the button cap and the control circuit board to support the button cap, the inner cover is provided with a through hole for the reset component and the test component to pass through, and is provided with a light guide column corresponding to the indicator sheet, and the button cap is provided with a through hole for the light guide column to pass through.

[0019] In some optional forms, the shell includes a base and an upper cover, the base and the upper cover are positioned by a snap-fit ​​structure and fixed to each other via threaded fasteners, wherein the upper cover is provided with a countersunk hole for passing the threaded fastener, and a hole plug is provided at the countersunk hole.

[0020] In certain optional forms, the input component includes a pair of contact arms, each contact arm is provided with an electrostatic contact, and the contact arms are respectively connected to a pair of pins via input connecting lines; the output component includes a pair of elastic contact arms, each elastic contact arm is provided with a dynamic contact to cooperate with the electrostatic contact, and the elastic contact arms and the output terminals are respectively coupled to the control circuit board.

[0021] In some optional forms, the leakage protection device includes a transformer assembly coupled to the control circuit board, and the input connection line passes through the transformer assembly to be connected to the contact arm and the pin.

[0022] In some optional forms, the leakage protection device includes an isolation plate, which is arranged at the bottom of the transformer assembly and is provided with a through hole for accommodating the transformer assembly.

[0023] The leakage protection device of the present invention has good safety (automatically cuts off power when the neutral line is powered off) and high reliability, and at the same time improves the internal structural layout of the product. While ensuring the safety of product use, it greatly reduces the size of the product, improves production and processing efficiency, and reduces costs. It is particularly suitable for compact application environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Other features and advantages of the present invention will be better understood through the following detailed description of the optional embodiments in conjunction with the accompanying drawings, in which the same reference numerals identify the same or similar components, wherein:

[0025] Figure 1 is a schematic diagram of the appearance of a leakage protection device according to an embodiment of the present invention;

[0026] Figure 2 is an exploded schematic diagram of a leakage protection device according to an embodiment of the present invention;

[0027] Figure 3A It is an exploded schematic diagram of a core component in a leakage protection device according to an embodiment of the present invention viewed from one direction;

[0028] Figure 3B yes Figure 3A An exploded view of the central movement assembly as seen from another direction;

[0029] Figure 4 It is an exploded schematic diagram of a control part of a core assembly in a leakage protection device according to an embodiment of the present invention;

[0030] Figure 5 yes Figure 4 An enlarged schematic diagram of the middle locking plate and the release;

[0031] Figure 6 yes Figure 4 An enlarged schematic diagram of the middle reset rod;

[0032] Figure 7 yes Figure 4 An enlarged schematic diagram of the elastic biasing member;

[0033] Figure 8 It is a schematic diagram of the state of the leakage protection device according to one embodiment of the present invention when the power supply is disconnected;

[0034] Fig. 9 yes Figure 8 Schematic diagram of the state of the leakage protection device when the reset button is pressed;

[0035] Fig.10 yes Fig. 9 Schematic diagram of the working state of the leakage protection device when the power is turned on;

[0036] Fig.11 It is a schematic diagram of the circuit principle of the leakage protection device of the present invention. DETAILED DESCRIPTION

[0037] The implementation and use of the embodiments are discussed in detail below. However, it should be understood that the specific embodiments discussed are merely exemplary of specific ways to implement and use the present invention, and are not intended to limit the scope of the present invention. When describing the structural positions of the various components, such as up, down, top, bottom, etc., the expressions of directions are not absolute, but relative. When the various components are arranged as shown in the figure, these directional expressions are appropriate, but when the positions of the various components in the figure change, these directional expressions also change accordingly.

[0038] In this document, the terms "coupling", "connection" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "coupling" can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this document can be understood according to specific circumstances.

[0039] The concept of the present invention is to provide a product with a reasonable layout, reduced volume and automatic power off to address the problems that the existing leakage protection devices are large in size and not suitable for compact environments, and cannot safely cut off the power. In the various embodiments illustrated and described below, a plug is used as an example, but it should be understood that any other leakage protection devices applicable to the concept of the present invention are not excluded.

[0040] Combination Figure 1 and Figure 2 The leakage protection device of the present invention comprises a housing and a core assembly 5 arranged in the housing. The housing is composed of a base 1 and an upper cover 2. One end or the front side of the base 1 and the upper cover 2 are connected together by a pair of connecting hooks 21 (one is shown in the figure) arranged in the upper cover 2 and corresponding base connecting buckles 13 and 14 arranged in the base 1. Figure 2 As shown. The other end or rear side of the base 1 and the upper cover 2 are bolted together by a threaded fastener, such as a pair of assembly screws 8. For the sake of product beauty, the screw hole on the upper cover 2 for the assembly screw 8 to pass through can be set as a countersunk hole 26, and a hole plug 3 is provided at the countersunk hole 26. As an option, the outer side of the hole plug 3 can be provided with a corporate trademark or other logo as needed.

[0041] The movement assembly 5 includes a control circuit board, an input assembly and an output assembly coupled to the control circuit board, and at least a reset assembly and a trip assembly, so as to realize the electrical connection and power off of the input and output ends. It should be understood that the input assembly can be other similar electrical coupling structures for connecting to a power supply, combined with Figure 2As shown, the input component may optionally include an L line pin 12 and an N line pin 11 (hereinafter referred to as pins 11 and 12), the head ends of the pins 11 and 12 extend out of the base 1 of the housing for insertion into the jacks of the corresponding sockets to obtain electricity, and the tail ends are respectively connected to the L input connection line 6 and the N input connection line 7 (hereinafter referred to as input connection lines 6 and 7). Among them, the head ends 62 and 72 of the input connection lines 6 and 7 are welded to the control circuit board, and the tail ends 61 and 71 are connected to the pins 11 and 12. The output component may include an output wire 4, and the L line terminal 42 and the N line terminal 41 of the output wire 4 (hereinafter referred to as output terminal 41 and 42) are respectively welded to the control circuit board. Optionally, a wire card 40 is also provided on the output wire 4, and the wire card 40 is clamped between the wire output port of the base 1 and the upper cover 2 after assembly, which has waterproof performance and increases the aesthetics of the product, as well as improves the anti-bending performance and service life of the product.

[0042] from Figure 2 It can also be seen that the upper cover 2 is provided with an opening for at least the reset component to protrude. In an optional embodiment, the leakage protection device may include a test component and / or a status display mechanism, and accordingly, the upper cover 2 may be provided with an opening 23 for the reset button of the reset component to protrude, an opening 25 for the test button of the test component to protrude, and an observation hole 24 for the status display mechanism.

[0043] Figure 3A and Figure 3B Schematic diagrams of the movement assembly 5 viewed from different directions are shown. In an optional embodiment, the movement assembly 5 of the leakage protection device includes a button cap 501 made of elastic insulating material in addition to the control part 500 that realizes the functions of reset and test, and the button cap 501 is suitable for extending out of the housing and has a reset button 5032 ( Figure 4 ) of the reset cap 5011. In the illustrated embodiment, the button cap 501 is configured to have a test button 5013 at the same time, and the test button 5013 is connected to a button nail 520, for example Figure 3A In the embodiment, the bottom end of the test button 5013 is provided with a button pin positioning hole 5014 for fixing the button pin 520. Since the button cap 501 is elastic, the side wall of the test button 5013 is also elastic, so that the button pin 520 can be switched between the on state and the off state by the operation of the test button 5013, wherein: in the on state, the test button 5013 is pressed so that the button pin 520 moves downward to contact with the test contact 5066 ( Figure 4 ) contacts and conducts to generate a simulated leakage current signal; in the disconnected state, the test button 5013 can be elastically reset so that the button pin 520 remains disconnected from the test contact on the control circuit board.

[0044] To realize the test function, the leakage protection device includes a transformer assembly 518 coupled to the control circuit board, a transformer threading hole 5181 is provided at the center thereof, and the tail ends 61 and 71 of the input connection wires 6 and 7 pass through the transformer threading hole 5181 and are connected to the pins 11 and 12. When leakage current is generated in the line, the transformer assembly 518 transmits the detected leakage signal to the circuit on the control circuit board for processing.

[0045] In an optional embodiment, the leakage protection device includes an isolation plate 519, which is arranged at the bottom of the transformer assembly 518 and is provided with a transformer through hole 5193 for accommodating the transformer assembly 518, thereby achieving a compact structure and reducing size.

[0046] In an optional embodiment, the leakage protection device includes an inner cover 502, which is made of insulating material and arranged between the button cap 501 and the control circuit board to support the button cap 501, so that the button cap 501 can be in close contact with the bottom surface of the upper cover 2 to play a waterproof role. Figure 3B As shown, the inner cover 502 may be provided with holes for the reset component and the test component to pass through, specifically, the reset button through hole 5021 for the reset button to pass through, and the test button through hole 5023 for the test button to pass through. As described above, in the embodiment with the status indication mechanism, the inner cover 502 may be provided with a light guide column 5022, which may pass through the light guide column through hole 5012 correspondingly provided on the button cap 501 and the observation hole 24 on the upper cover 2 to expose the surface of the upper cover 2, so as to display the working status of the product. Therefore, the inner cover 502 is preferably made of a transparent insulating material.

[0047] Now combine Figures 4 to 7 The control portion 500 of the movement assembly 5 is described.

[0048] In an optional embodiment, the leakage protection device includes an intermediate bracket 507 for accommodating and assembling the input component, the output component and the movement component. Optionally, the intermediate bracket 507 is made of insulating material, which is assembled and fixed on the control circuit board 506 and has a cavity structure to accommodate a tripping component, for example.

[0049] In the illustrated embodiment, the input assembly further includes a pair of contact arms made of conductive material, namely, an L contact arm 508 and an N contact arm 509 (hereinafter referred to as contact arms 508 and 509), the contact arms 508 and 509 are respectively provided with electrostatic contacts, and the contact arms 508 and 509 are respectively connected to the pins 11 and 12 via the input connecting wires 6 and 7. Specifically, the front end of the contact frame 507 is provided with an input L contact hole 5071 and an input N contact hole 5072 for assembling and fixing the tail ends of the contact arms 508 and 509 without electrostatic contacts, and the control circuit board 506 is provided with two power input welding holes 5061 and 5062 for respectively welding the head ends 62 and 72 of the input connecting wires 6 and 7 and the tail ends of the contact arms 508 and 509.

[0050] Correspondingly, the output assembly also includes a pair of elastic contact arms made of conductive materials, namely, L elastic contact arm 510 and N elastic contact arm 511 (hereinafter referred to as elastic contact arms 510, 511), the elastic contact arms 510, 511 are provided with moving electric contacts to cooperate with the electrostatic contacts, and the elastic contact arms 510, 511 and the output terminals are respectively coupled to the control circuit board, and the electrostatic contacts and the moving electric contacts are kept in a normally open state by the action of the elastic arms. Specifically, the rear end of the contact frame 507 is provided with an output L contact hole 5073 and an output N contact hole 5074, which are respectively used to assemble and fix the tail ends of the elastic contact arms 510, 511 without moving electric contacts. The circuit control board 506 is provided with two power output welding holes 5063, 5064, which are used to respectively weld the output terminals 41, 42 of the output wire 4 and the tail ends of the elastic contact arms 510, 511.

[0051] In an alternative embodiment, in combination Figure 4 and Figure 6 As shown, the reset assembly includes a reset rod 503, which is made of insulating material and has a reset button 5032 on the top. To reset the product, the reset button needs to be pressed. A spring positioning column 5033 is provided at the bottom of the reset rod 503, and a reset spring 505 is provided on the positioning column. The resilience of the reset spring 505 after being compressed is used to drive the trip assembly to perform the tripping action. The bottom of the reset rod 503 is assembled with the reset spring 505 and passes through the reset rod through hole 5065 on the control circuit board 506, and respectively abuts against the spring holes 5191 and 5192 ( Figure 3B )superior.

[0052] like Figure 4As shown, in an optional embodiment, the trip assembly includes a trip coil 513, a magnetic core 512 that cooperates with the trip coil 513, and a tripper 516 that causes the input assembly and the output assembly to be connected or disconnected. A coil winding 5132 is wound around the middle coil column of the trip coil 513, and a magnetic field is generated on the coil winding when the coil is powered on. The inside of the coil winding 5132 is a coil inner hole 5131, which is used to load the magnetic core 512 and enable it to slide freely in the axial direction. The magnetic core 512 is made of magnetic metal material and has magnetic conductivity. Its front end is provided with an iron core clamping column 5121 and an iron core pull plate 5122, and its tail end is provided with a tail end face 5123.

[0053] Optionally, the trip assembly further includes a magnetic plate 514, which is mounted on the trip coil 513 and is provided with a magnetic plate hole 5141 for the magnetic core 512 to pass through, and the magnetic plate hole 5141 is concentric with the coil inner hole 5131 of the trip coil 513, so that the magnetic core 512 can pass through the magnetic plate hole 5141 and slide freely in the coil inner hole 5131. When the input assembly is powered on and the reset assembly is operated, the tail end face 5123 of the magnetic core can be adsorbed on the inner surface of the magnetic plate 514, that is, Figure 4 On the inner surface of the magnetic plate tail plate 5142. Figure 5 As shown, the releaser 516 is provided with an L support arm 5161 and an N support arm 5162, which are respectively used to support the elastic arms of the elastic contact arms 510 and 511 so that they can move upward and thus make the electrostatic contacts on the contact arms 508 and 509 contact and close with the moving electric contacts on the elastic contact arms 510 and 511.

[0054] According to the present invention, the leakage protection device includes a disconnection component that enables the above-mentioned reset component and the trip component to cooperate, and the disconnection component is configured so that: when the input component is powered on, the disconnection component can connect the reset component and the trip component after operating the reset component, and prompt the trip component to connect the input component and the output component; when the input component is powered off or a leakage fault occurs, the disconnection component cuts off the connection between the reset component and the trip component, and prompts the trip component to disconnect the input component and the output component, thereby ensuring the safety of electricity use.

[0055] In an optional embodiment, the cut-off assembly may include a lock plate and an elastic biasing member, wherein the lock plate is mounted on the trip assembly and can be switched between an initial state, a connected state and a cut-off state, wherein: in the initial state, the lock plate is biased toward the reset assembly in a first direction by the elastic biasing member; in the connected state, the lock plate is biased in the first direction and is engaged with the reset assembly; in the cut-off state, the lock plate pivots around the trip assembly in a second direction opposite to the first direction and is disengaged from the reset assembly. In this way, the setting of the cut-off assembly does not increase the overall size of the product, but obtains safety of use with a compact structural layout. It should be understood that the biasing force provided by the elastic biasing member here is intended to make the lock plate have a tendency to connect to the reset assembly, and the biasing force is less than the force applied by the elastic contact arm to the tripper, so that the lock plate can be disconnected from the reset assembly by the force of the elastic contact arm, but the biasing force is less than the force of the magnetic core adsorbed on the magnetic plate in the power-on state, so that it will not affect the connection between the lock plate and the reset assembly during normal use.

[0056] Specifically, in certain embodiments, Figure 4 The locking plate 517 is configured to be driven by the magnetic core 512 to be biased in a first direction, and driven by the release 516 to pivot in a second direction. As shown in the drawings, the first direction is counterclockwise, and the second direction is clockwise.

[0057] Combination Figure 5 As shown, in an optional embodiment, a hook 5171 is provided at the top of the lock plate 517 to be engaged with the bayonet 5031 provided on the reset assembly (reset rod 503), so that the reset rod 503 and the lock plate 517 are hooked together. A notch 5174 is provided at the middle position of the bottom of the lock plate 517 for the magnetic core 512 to be engaged, for example, the iron core clamping column 5121 to be engaged. In this way, when the magnetic core 512 moves along the tripping coil 513, the iron core pulling plate 5122 can pull the lock plate 517 so that the lock plate 517 is biased along the first direction. It should be understood that the notch 5174 of the lock plate is set to a suitable length, which can be used to engage the iron core clamping column 5121 on the magnetic core 512, and can also prevent the lock plate 517 from being separated from the iron core pulling plate 5122 on the magnetic core 512 when the tripper 516 moves upward.

[0058] In an alternative embodiment, in combination Figure 7 As shown, the elastic biasing member may be a spring leaf 515, comprising a spring foot 5152 fixed to the trip coil 513 and a center recess 5151 suitable for snapping into the permeable core 512. For example, the center recess 5151 is snapped onto the core clamping column 5121 of the permeable core 512. In the initial state, the spring leaf 515 provides the permeable core 512 with a smaller elastic force that is away from the reset component (that is, toward the tail of the permeable core).

[0059] In order to enable the locking plate 517 to be driven by the release 516 to pivot along the second direction, locking plate shaft heads 5172 and 5173 may be provided on both sides of the middle portion of the locking plate 517, and the locking plate shaft heads are suitable for being pivotally connected to the release 516, for example Figure 5 In the locking plate shaft grooves 5165 and 5166 shown, the movement of the releaser 516 can drive the locking plate 517 to move and pivot accordingly.

[0060] from Figure 5 It can also be seen that the releaser 516 may be provided with limiting guide strips 5163 and 5164, which may cooperate with the slide grooves (not shown) provided on the intermediate bracket 507 to limit the movement direction and movement range of the releaser 516. In addition, the releaser 516 may also be provided with an indicator piece mounting head 5167, which is provided at the top end of the releaser 516 and can be used to assemble the indicator piece 504 ( Figure 4 The indicator sheet 504 can be made of a soft elastic insulating material and have an identification color, such as green or red. An indicator sheet mounting hole 5041 is provided on one side of the indicator sheet. The indicator sheet mounting hole 5041 is mounted on the indicator sheet mounting head 5167 on the release 516, so that the indicator sheet 504 can move up and down with the release 516 to indicate the reset state or the tripping state of the product.

[0061] The following combination Figures 8 to 11 The operating state and working principle of the leakage protection device of the present invention are described.

[0062] Figure 8 The state of the leakage protection device when the power is disconnected, that is, the tripping state when the input end is not connected to electricity. At this time, the magnetic core 512 is subjected to the force of the spring 515 in the direction of the core tail, so that the core pull plate 5122 pulls the notch 5174 of the lock plate 517. At the same time, due to the lever fulcrum of the lock plate shaft head 5172, 5173, the hook 5171 of the lock plate has a tendency to move in the direction of the reset rod 503 and abuts against the side of the reset rod 503. In this state, the indicator sheet 504 on the release is in the lowest position and cannot be seen from the outside of the upper cover 2, indicating that it is not in operation.

[0063] When the input end is not powered, if the reset button 5032 on the top of the reset rod 503 is pressed with a finger, the reset rod 503 compresses the reset spring 505, and the bayonet 5031 on the reset rod moves downward. When the bayonet 5031 meets the hook 5171 of the lock plate 517, the lock plate 517 is engaged with the hook 5171 under the elastic force of the spring 515 transmitted from the permeable core 512. Fig. 9As shown. At this time, the finger is released, and the reset rod 503 moves upward under the rebound force of the reset spring 505 and drives the lock plate 517 and the release 516 to move upward together. When it moves to a certain position, the L support arm 5161 and the N support arm 5162 on the release 516 are subjected to the downward elastic force of the elastic contact arms 510 and 511 and act on the lock plate 517, so that the lock plate 517 generates a torsional moment in the second direction (clockwise direction) with the lock plate shaft heads 5172 and 5173 as the axis. The clockwise torsional moment can overcome the elastic force of the spring leaf 515 so that the lock plate 517 rotates clockwise along the lock plate shaft head, that is, the lock plate hook 5171 is disengaged from the reset rod bayonet 5031. Then, the reset rod 503 continues to move upward to the initial position under the rebound force of the reset spring 505. At the same time, under the downward elastic force of the elastic contact arms 510 and 511, the releaser 516 moves downward to the initial position together with the locking plate 517, that is, the reset fails and the product returns to the Figure 8 The trip status is shown.

[0064] When the input end is in a live state, that is, when the plug is inserted into the socket, the input end of the plug is live. When the reset button on the top of the reset rod 503 is pressed with a finger, the reset rod 503 compresses the reset spring 505, and the bayonet 5031 moves downward. When the bayonet 5031 meets the hook 5171 of the lock plate, the lock plate 517 is subjected to the elastic force of the spring 515 transmitted by the magnetic core 512, so that the hook 5171 and the bayonet 5031 are locked together. Fig. 9 As shown. At the same time, because the tripping coil 513 is in the energized state at this time, the coil on the tripping coil 513 generates a magnetic field, so that the tail end face 5123 of the magnetic core 512 is attracted to the inner surface of the tail plate 5142 of the magnetic plate. At this time, the finger is released, and the reset rod 503 moves upward under the rebound force of the reset spring 505 and drives the lock plate 517 and the releaser 516 to move upward together. When it moves to a certain position, the L support arm 5161 and the N support arm 5162 on the releaser 516 are subjected to the downward elastic force of the elastic contact arms 510 and 511 and transmitted to the lock plate 517, so that the lock plate 517 generates a clockwise torsional moment with the lock plate shaft heads 5172 and 5173 as the axis. However, at this time, the clockwise torsional moment cannot overcome the combined force of the elastic force of the spring leaf 514 and the magnetic force generated by the coil, so the lock plate 517 will not rotate clockwise along the axial direction of the lock plate shaft head, that is, the hook 5171 of the lock plate and the bayonet 5031 of the reset rod will not be separated, and the reset rod 503 continues to move upward under the action of the rebound force of the reset spring 505 and drives the releaser 516 to overcome the downward elastic force of the elastic contact arms 510 and 511, and finally makes the moving electric contacts of the elastic contact arms 510 and 511 contact and conduct with the electrostatic contacts of the contact arms 508 and 509, that is, the reset is successful. Fig.10 In this state, the indicator sheet 504 on the tripper is at the highest position, and the color of the indicator sheet 504 can be seen from the outside of the upper cover 2, indicating a working state.

[0065] Combining the above description Fig.11 It can be seen that when the input terminals L and N are powered on, the trip coil 513 (SOL) generates a magnetic field, but due to the structural limitations of the cut-off component, the product power cannot be turned on and always remains at Figure 8 The tripping status is shown. Fig. 9 Press the reset button as shown, and the input terminal is energized, disconnect the components to release space, then Fig.10 As shown, the power supply is turned on. Therefore, the leakage protection device of the present invention cleverly utilizes the cut-off component to improve the safety performance.

[0066] When the transformer component 518 (CT) detects leakage, the leakage current signal will be transmitted to the processor U1. Once the leakage current is greater than the set value, the transistor Q1 will be triggered to turn on. After Q1 is turned on, the working potential of SOL is pulled down, and the magnetic field cannot be effectively generated. The power supply can be cut off by cutting off the component. In addition, when the N line of the power supply is powered off, the power supply is also cut off due to the loss of power to SOL.

[0067] Specific to Figure 8 and Fig.10 ,exist Fig.10 In the reset state, the test button 5013 is pressed, the trip coil 513 is powered off, and the electromagnetic force originally acting on the permeable core 512 disappears. At this time, the L bracket 5161 and the N bracket 5162 on the tripper 516 are subjected to the downward elastic force of the elastic contact arms 510 and 511 and act on the lock plate 517, so that the lock plate 517 generates a clockwise torsional moment with the lock plate shaft heads 5172 and 5173 as the axis. Similarly, at this time, this clockwise torsional moment can overcome the elastic force of the spring leaf 514, so that the lock plate 517 rotates clockwise along the lock plate shaft head, that is, the lock plate hook 5171 is separated from the bayonet 5031 of the reset rod, and the reset rod 503 moves upward to the initial position under the rebound force of the reset spring 505. Under the downward elastic force of the elastic contact arms 510 and 511, the tripper 516 moves downward to the initial position together with the locking plate 517, so that the dynamic contacts of the elastic contact arms 510 and 511 are separated and disconnected from the electrostatic contacts of the contact arms 508 and 509, that is, the product is tripped and returns to the original position. Figure 8 Status shown.

[0068] It should be understood here that the embodiments shown in the figures only show the optional shapes, sizes and arrangements of the various optional components of the leakage protection device according to the present invention. However, they are only illustrative and not restrictive. Other shapes, sizes and arrangements may also be adopted without departing from the spirit and scope of the present invention.

[0069] The technical content and technical features of the present invention have been disclosed above. However, it can be understood that under the creative ideas of the present invention, those skilled in the art can make various changes and improvements to the above disclosed concepts, but they all belong to the protection scope of the present invention. The description of the above embodiments is illustrative rather than restrictive, and the protection scope of the present invention is determined by the claims.

Claims

1. A leakage protection device, comprising a housing and a core assembly disposed in the housing, wherein the core assembly comprises a control circuit board, and an input assembly and an output assembly coupled to the control circuit board, characterized in that: The leakage protection device comprises a reset assembly, a trip assembly, and a cut-off assembly that matches the reset assembly and the trip assembly, wherein the cut-off assembly comprises a locking plate and an elastic biasing member, wherein the locking plate is mounted on the trip assembly and can be switched between an initial state, a connected state, and a cut-off state, and wherein the cut-off assembly is configured such that: In the initial state, the locking plate is biased toward the reset assembly in a first direction by the elastic biasing member. When the input assembly is powered on, the disconnection assembly connects the reset assembly and the trip assembly after operating the reset assembly, and causes the trip assembly to connect the input assembly and the output assembly. In the connected state, the locking plate is biased in the first direction and is engaged with the reset assembly. When the input component is powered off or has a leakage fault, the cut-off component cuts off the connection between the reset component and the trip component, and prompts the trip component to disconnect the input component and the output component. In the cut-off state, the locking plate pivots around the trip component in a second direction opposite to the first direction, and disengages from the reset component.

2. The leakage protection device according to claim 1, characterized in that: The trip assembly includes a trip coil, a magnetically conductive core cooperating with the trip coil, and a tripper that causes the input assembly and the output assembly to be connected or disconnected. The locking plate is configured to be driven by the magnetically conductive core to be biased along the first direction, and driven by the tripper to pivot along the second direction.

3. The leakage protection device according to claim 2, characterized in that: The locking plate is provided with a notch for the magnetic core to be inserted into, and the notch is configured to bias the locking plate along the first direction when the magnetic core moves along the tripping coil. The locking plate also includes a hook suitable for engaging with a bayonet provided on the reset assembly.

4. The leakage protection device according to claim 2, characterized in that: The elastic biasing member is a leaf spring, comprising a spring foot fixed to the trip coil and a central recess suitable for being clamped into the magnetic core. In the initial state, the elastic biasing member applies a force to the magnetic core away from the reset assembly.

5. The leakage protection device according to claim 2, characterized in that: The locking plate also includes a locking plate shaft head, which is suitable for being pivotally connected to the releaser so as to move and pivot with the releaser.

6. The leakage protection device according to claim 2, characterized in that: The trip assembly includes a magnetic conductive plate, which is mounted on the trip coil and is provided with a magnetic conductive plate hole for the magnetic conductive core to pass through, and the magnetic conductive plate hole is concentric with the coil inner hole of the trip coil. When the input assembly is powered on and the reset assembly is operated, the end face of the magnetic conductive core is adsorbed on the inner surface of the magnetic conductive plate.

7. The leakage protection device according to claim 2, characterized in that: The leakage protection device includes an intermediate bracket for accommodating and assembling the input component, the output component and the movement component, wherein the releaser is provided with a limiting guide bar, and the limiting guide bar cooperates with the slide groove provided on the intermediate bracket to limit the movement direction and movement range of the releaser.

8. The leakage protection device according to claim 2, characterized in that: The leakage protection device comprises a status display mechanism, wherein the status display mechanism comprises an indicator sheet connected to the release and is suitable for being observed from outside the housing.

9. The leakage protection device according to claim 8, characterized in that: The reset assembly comprises a reset button protruding out of the shell, and the leakage protection device comprises a button cap made of elastic insulating material, which is suitable for protruding out of the shell and has a reset cap covering the reset button.

10. The leakage protection device according to claim 9, characterized in that: The leakage protection device includes a test assembly, the test assembly includes a test button formed on the button cap, the test button is connected to a button nail, and the button nail can be switched between an on state and an off state through the operation of the test button, wherein: In the conducting state, the test button is pressed so that the button pin is connected to the test contact on the control circuit board; In the disconnected state, the test button is elastically reset to disconnect the button pin from the test contact on the control circuit board.

11. The leakage protection device according to claim 10, characterized in that: The leakage protection device includes an inner cover, which is made of a transparent insulating material and is arranged between the button cap and the control circuit board to support the button cap. The inner cover is provided with a through hole for the reset component and the test component to pass through, and is provided with a light guide column corresponding to the indicator sheet, and the button cap is provided with a through hole for the light guide column to pass through.

12. The leakage protection device according to claim 1, characterized in that: The shell includes a base and an upper cover, wherein the base and the upper cover are positioned by a snap-fit ​​structure and fixed to each other via a threaded fastener, wherein the upper cover is provided with a countersunk hole for passing the threaded fastener, and a hole plug is provided at the countersunk hole.

13. The leakage protection device according to claim 1, characterized in that: The input component includes a pair of contact arms, each of which is provided with an electrostatic contact, and the contact arms are respectively connected to a pair of pins via input connecting lines; the output component includes a pair of elastic contact arms, each of which is provided with a dynamic contact to cooperate with the electrostatic contact, and the elastic contact arms and the output terminals are respectively coupled to the control circuit board.

14. The leakage protection device according to claim 13, characterized in that: The leakage protection device comprises a transformer assembly coupled to the control circuit board, and the input connection line passes through the transformer assembly and is connected to the contact arm and the pin.

15. The leakage protection device according to claim 14, characterized in that: The leakage protection device comprises an isolation plate, which is arranged at the bottom of the transformer assembly and is provided with a through hole for accommodating the transformer assembly.

Images