CN114614439A - Leakage protector - Google Patents

Abstract

The invention provides a leakage protection device, which comprises a shell and a core assembly arranged in the shell, wherein the core assembly comprises a control circuit board, and an input assembly and an output assembly which are coupled with the control circuit board. The earth leakage protection device includes reset assembly, dropout subassembly to and make reset assembly and dropout subassembly matched with cut off the subassembly, cut off the subassembly and set up to make: when the input assembly is powered on, the cut-off assembly is connected with the reset assembly and the tripping assembly after the reset assembly is operated, and the tripping assembly is enabled to be communicated with the input assembly and the output assembly; when the input assembly is powered off or has an electric leakage fault, the disconnecting assembly cuts off the connection between the reset assembly and the tripping assembly and prompts the tripping assembly to disconnect the input assembly and the output assembly. The leakage protection device has good safety and high reliability, improves the internal structure layout of the product, greatly reduces the volume of the product, and is particularly suitable for compact application environments.

Description

Leakage protector

Technical Field

The present invention relates generally to the electrical field, and more particularly to a leakage protection device.

Background

Along with the continuous improvement of the power utilization safety consciousness of people, the use of the leakage protection device is more and more extensive. The application fields and the use scenes are continuously increased. The existing leakage protection device is large in size due to the limitation of a mechanical structure, and when the existing leakage protection device is matched with some small household appliances (such as an electric hair drier, a dryer and the like) for use, the existing leakage protection device can cause the integral appearance of the product to be inconsistent, and the integral attractiveness of the product is reduced. In addition, due to the limitation of principle and structure, when the zero (N) line of the power supply is powered off, the switch contact of the existing leakage protection plug is still in a closed position, and the input live line (L) and the zero line are still in a connected state, but because the leakage protection plug loses the capacity of leakage detection and power supply cut-off, serious potential safety hazard exists.

It is therefore desirable to develop improved earth leakage protection devices to compensate for these deficiencies.

Disclosure of Invention

The present invention is directed to an earth leakage protection device, which further improves the safety of use and improves the above-mentioned factors.

To this end, according to the present invention, there is provided an earth leakage protection device comprising a housing and a core assembly disposed in the housing, the core assembly comprising a control circuit board, and an input assembly and an output assembly coupled to the control circuit board, wherein the earth leakage protection device comprises a reset assembly, a trip assembly, and a cut-off assembly for cooperating the reset assembly and the trip assembly, the cut-off assembly being configured such that: when the input assembly is powered on, the cut-off assembly connects the reset assembly and the trip assembly after operating the reset assembly and enables the trip assembly to communicate the input assembly and the output assembly; when the input assembly is powered off or has an electric leakage fault, the cut-off assembly cuts off the connection between the reset assembly and the tripping assembly and prompts the tripping assembly to cut off the input assembly and the output assembly.

The invention provides the cutting-off component, so that the electric power communication between the input end and the output end is ensured when the leakage protection device is normally reset and used, and the input end and the output end can be automatically cut off when power is cut off or leakage faults occur, so that the safety performance of the leakage protection device is improved, and the reliability is high.

The present invention may further include any one or more of the following alternatives according to the above technical idea.

In certain alternatives, the severing assembly includes a latch plate mounted to the trip assembly and switchable between an initial state, a connected state, and a severing state, wherein: in the initial state, the strike plate is biased in a first direction toward the reset assembly by the resilient biasing member; in the connection state, the lock catch plate is biased in a first direction and is clamped with the reset assembly; in the cutting-off state, the lock catch plate pivots around the tripping assembly along a second direction opposite to the first direction and is separated from the clamping connection with the reset assembly.

In certain alternatives, the trip assembly includes a trip coil, a magnetically permeable core cooperating with the trip coil, and a trip unit urging the input assembly and the output assembly into and out of communication, the strike plate being configured to be driven by the magnetically permeable core to be biased in the first direction and driven by the trip unit to pivot in the second direction.

In some optional forms, be equipped with on the hasp board and supply the breach that magnetic core card was gone into, the breach is set up to be in magnetic core edge when trip coil removed make the hasp board follow the first direction biasing, the hasp board still including be suitable for with the pothook of the bayonet socket looks joint that resets and set up.

In some alternatives, the resilient biasing member is a spring plate including a spring leg fixed to the trip coil and a central notch adapted to snap into the magnetically permeable core, the resilient biasing member applying a force to the magnetically permeable core away from the reset assembly in the initial state.

In certain alternatives, the strike plate further includes a strike plate stub shaft adapted to be pivotally coupled to the trip unit so as to move and pivot with the trip unit.

In some optional forms, the trip assembly includes a magnetic conductive plate, the magnetic conductive plate is sleeved on the trip coil and is provided with a magnetic conductive plate hole through which the magnetic conductive iron core passes, the magnetic conductive plate hole is concentric with the coil inner hole of the trip coil, and when the input assembly is powered on and the reset assembly is operated, the end surface of the magnetic conductive iron core is adsorbed on the inner surface of the magnetic conductive plate.

In some optional forms, the leakage protection device includes a middle support for accommodating and assembling the input assembly, the output assembly, and the movement assembly, wherein a limiting guide bar is provided on the trip unit, and the limiting guide bar is matched with a sliding groove provided on the middle support to limit the movement direction and the movement stroke range of the trip unit.

In certain alternatives, the earth leakage protection device includes a status display mechanism including an indicator tab connected to the trip unit and adapted to be viewed from outside the housing.

In certain alternatives, the reset assembly includes a reset button protruding outside the housing, and the earth leakage protection device includes a button cap of resilient insulating material adapted to protrude outside the housing and having a reset cap encasing the reset button.

In some alternatives, the earth leakage protection device comprises a test assembly including a test button formed on the button cap, the test button having a button pin connected thereto, the button pin being switchable between an on state and an off state via operation of the test button, wherein: in the conducting state, the test button is pressed to enable the button nail to be conducted with a test contact on the control circuit board; in the off state, the test button is elastically reset so that the button nail is disconnected from the test contact on the control circuit board.

In some optional forms, the earth leakage protection device includes an inner cover, the inner cover is made of 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 via hole for the reset component and the test component to pass through, and is provided with a light guide column corresponding to the indication sheet, and the button cap is provided with a via hole for the light guide column to pass through.

In some alternatives, the housing includes a base and a cover, the base and the cover being positioned by a snap-fit arrangement and secured to each other via a threaded fastener, wherein the cover is provided with a counter bore for passage of the threaded fastener, the counter bore being provided with a hole plug.

In some alternatives, the input assembly comprises a pair of contact arms, each provided with an electrostatic contact, the contact arms being connected to a respective pair of pins via an input connection line; the output assembly includes a pair of resilient contact arms, each resilient contact arm being provided with an electrical contact for mating with the electrostatic contact, the resilient contact arms and output terminals being coupled to the control circuit board, respectively.

In some alternatives, the earth leakage protection device includes a transformer assembly coupled to the control circuit board, the input connection line passing through the transformer assembly to connect with the contact arm and the pin.

In some alternatives, the earth leakage protection device comprises a spacer arranged at the bottom of the transformer assembly and provided with a via for receiving the transformer assembly.

The leakage protection device has the advantages of good safety (the zero line cuts off the power supply automatically), high reliability, improved internal structure layout of the product, greatly reduced volume of the product while ensuring the use safety of the product, improved production and processing efficiency, and reduced cost, and is particularly suitable for compact application environment.

Drawings

Other features and advantages of the present invention will be better understood by the following detailed description of alternative embodiments, taken in conjunction with the accompanying drawings, in which like characters represent the same or similar parts, and in which:

fig. 1 is a schematic external view of an earth leakage protection device according to an embodiment of the invention;

FIG. 2 is an exploded view of an earth leakage protection device according to an embodiment of the invention;

FIG. 3A is an exploded view of a core assembly of an earth leakage protection device, as viewed from one direction, according to one embodiment of the present invention;

FIG. 3B is an exploded view of the engine assembly of FIG. 3A from another orientation;

FIG. 4 is an exploded view of the control portion of the core assembly of the earth leakage protection device in accordance with one embodiment of the present invention;

FIG. 5 is an enlarged schematic view of the striker plate and the trip unit of FIG. 4;

fig. 6 is an enlarged schematic view of the reset lever of fig. 4;

FIG. 7 is an enlarged schematic view of the resilient biasing member of FIG. 4;

FIG. 8 is a schematic diagram of an earth leakage protection device in an off state according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of the earth leakage protection device of FIG. 8 in a state in which the reset button is pressed;

FIG. 10 is a schematic diagram of the earth leakage protection device of FIG. 9 in an operating state when power is applied;

fig. 11 is a schematic circuit diagram of the earth leakage protection device of the present invention.

Detailed Description

The practice and use of the embodiments are discussed in detail below. It should be understood, however, that the specific embodiments discussed are merely illustrative of specific ways to make and use the invention, and do not limit the scope of the invention. The description herein of the structural positions of the respective components, such as the directions of upper, lower, top, bottom, etc., is not absolute, but relative. When the respective components are arranged as shown in the drawings, these direction expressions are appropriate, but when the positions of the respective components in the drawings are changed, these direction expressions are changed accordingly.

In this document, the terms "coupled" and "connected" should be interpreted broadly, e.g., "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms herein can be understood by those of ordinary skill in the art as appropriate.

The invention aims at solving the problems that the existing leakage protection device is large in size and is not suitable for compact environment and cannot be safely powered off, and provides a product which is reasonable in layout, small in size and capable of automatically powering off. In the embodiments illustrated and described below, a plug is used as an example, however it should be understood that any other residual leakage protection device applicable to the inventive concept is not excluded.

Referring to fig. 1 and 2, the earth leakage protection device of the present invention includes a casing and a movement assembly 5 disposed in the casing, the casing is composed of a base 1 and an upper cover 2, wherein one end or front side of the base 1 and the upper cover 2 is snap-connected together by a pair of connection hooks 21 (one is exemplarily shown in the figures) disposed in the upper cover 2 and corresponding base connection buckles 13, 14 disposed in the base 1, as shown in fig. 2. The other end or rear side of the base 1 and the upper cover 2 are bolted together by threaded fasteners, such as a pair of assembly screws 8. For the aesthetic appearance of the product, the screw holes of the upper cover 2 for the assembly screws 8 to pass through may be provided as countersunk holes 26, and the hole plugs 3 are provided at the countersunk holes 26. Alternatively, the outside of the plug 3 may be provided with a trade mark or other identification of the trade company as required.

The movement assembly 5 comprises a control circuit board, an input assembly and an output assembly which are coupled with the control circuit board, and also at least comprises a reset assembly and a tripping assembly, so that the input end and the output end are electrically connected and powered off. It should be understood that the input assembly may be other similar electrical coupling structures for connecting to a power supply, and as shown in fig. 2, the input assembly optionally includes 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 inserting into the corresponding socket for power supply, and the tail ends of the pins are connected to the L-input connecting line 6 and the N-input connecting line 7 (hereinafter, referred to as input connecting lines 6 and 7), respectively. The head ends 62, 72 of the input connecting wires 6, 7 are soldered to the control circuit board, and the tail ends 61, 71 are connected to the pins 11, 12. The output member may include an output electric wire 4, and an L-wire terminal 42 and an N-wire terminal 41 (hereinafter, simply referred to as output terminals 41, 42) of the output electric wire 4 are soldered to the control circuit board, respectively. Optionally, the output wire 4 is further provided with a wire clamp 40, and the wire clamp 40 is clamped between the wire output ports of the base 1 and the upper cover 2 after being assembled, so that the waterproof performance is achieved, the attractiveness of the product is improved, the bending resistance of the product is improved, and the service life of the product is prolonged.

As can also be seen in fig. 2, the upper cover 2 is provided with an opening through which at least the resetting assembly protrudes. In an alternative embodiment, the earth leakage protection device may comprise a test assembly and/or a status display mechanism, and accordingly, the upper cover 2 may be provided with an opening 23 for the extension of the reset button of the reset assembly, an opening 25 for the extension of the test button of the test assembly, and a viewing aperture 24 for the status display mechanism.

Fig. 3A and 3B respectively show exploded schematic views of the deck assembly 5 viewed from different directions. In an alternative embodiment, the movement assembly 5 of the earth leakage protection device includes, in addition to the control portion 500 for performing the functions of reset, test, etc., a button cap 501 made of an elastic insulating material, the button cap 501 being adapted to extend out of the housing and having a reset cap 5011 covering a reset button 5032 (fig. 4). 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 with a button nail 520, for example, in fig. 3A, a button nail positioning hole 5014 is provided at the bottom end of the test button 5013 for fixing the button nail 520. Since the button cap 501 has elasticity, the side wall of the test button 5013 has elasticity accordingly, so that the button nail 520 is switchable between an on state and an off state via the operation of the test button 5013, in which: in the on state, the test button 5013 is pressed to cause the button pin 520 to move downward to contact the test contact 5066 (FIG. 4) on the control circuit board and conduct to generate an analog leakage current signal; in the off state, the test button 5013 can be elastically reset so that the button pin 520 is kept off from the test contacts on the control circuit board.

To perform the testing function, the earth leakage protection device includes a transformer 518 coupled to the control circuit board, which has a transformer threading hole 5181 at the center thereof, and the tail ends 61, 71 of the input connection lines 6, 7 are connected to the pins 11, 12 through the transformer threading hole 5181. When a leakage current is generated in the line, the transformer 518 transmits the detected leakage signal to the circuit on the control circuit board for processing.

In an alternative embodiment, the earth leakage protection device includes a spacer 519, the spacer 519 being disposed at the bottom of the transformer assembly 518 and being provided with a transformer via 5193 for receiving the transformer assembly 518, thereby providing a compact and reduced size.

In an alternative embodiment, the earth leakage protection device includes an inner cover 502, the inner cover 502 is made of an insulating material and is disposed between the button cap 501 and the control circuit board to support the button cap 501, enabling the button cap 501 to be in close contact with the bottom surface of the upper cover 2, and functioning as a waterproof. As shown in FIG. 3B, the inner cover 502 may be provided with vias for the reset assembly and the test assembly to pass through, specifically, a reset button via 5021 for the reset button to pass through, and a test button via 5023 for the test button to pass through. As described above, in the embodiment having the status indication mechanism, the inner lid 502 may be provided with the light guiding column 5022, and the light guiding column 5022 may pass through the light guiding column through hole 5012 correspondingly provided on the button cap 501 and the observation hole 24 on the upper lid 2 to expose the surface of the upper lid 2, so as to display the operating status of the product. Thus, the inner lid 502 is preferably made of a transparent insulating material.

The control portion 500 of the deck assembly 5 will now be described with reference to fig. 4 to 7.

In an alternative embodiment, the earth leakage protection device comprises a central housing 507 for receiving and mounting the input assembly, the output assembly and the movement assembly. Optionally, the middle bracket 507 is made of an insulating material, and is assembled and fixed on the control circuit board 506, and is provided with a cavity structure to accommodate the trip unit, for example.

In the illustrated embodiment, the input assembly further includes a pair of contact arms, i.e., an L contact arm 508 and an N contact arm 509 (hereinafter referred to simply as contact arms 508 and 509) which are made of conductive material, the contact arms 508 and 509 are respectively provided with electrostatic contacts, and the contact arms 508 and 509 are connected to the pins 11 and 12 via the input connection lines 6 and 7, respectively. Specifically, the front end of the contact holder 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, 509, which do not have electrostatic contacts, and the control circuit board 506 is provided with two power input welding holes 5061, 5062 for respectively welding the head ends 62, 72 of the input connecting wires 6, 7 and the tail ends of the contact arms 508, 509.

Accordingly, the output module further includes a pair of elastic contact arms, i.e., an L elastic contact arm 510 and an N elastic contact arm 511 (hereinafter, referred to as elastic contact arms 510 and 511) formed by processing a conductive material, the elastic contact arms 510 and 511 are provided with the moving electrical contact to be mated with the electrostatic contact, and the elastic contact arms 510 and 511 and the output terminal are respectively coupled to the control circuit board, and the electrostatic contact and the moving electrical contact are kept in a normally open state by the action of the elastic arms. Specifically, the rear end of the contact carrier 507 is provided with an output L contact hole 5073 and an output N contact hole 5074 for fitting and fixing the rear ends of the resilient contact arms 510, 511, respectively, which do not have a moving electrical contact. The circuit control board 506 is provided with two power output welding holes 5063, 5064 for welding the output terminals 41, 42 of the output electric wires 4 and the tail ends of the elastic contact arms 510, 511, respectively.

In an alternative embodiment, as shown in fig. 4 and 6, the reset assembly includes a reset rod 503 made of insulating material and having a reset button 5032 disposed at the top thereof, which is pressed to reset the product. The bottom of the reset rod 503 is provided with a spring positioning post 5033, the positioning post is provided with a reset spring 505, and the resilience of the compressed reset spring 505 is used for driving the trip assembly to implement the trip action. The bottom of the return lever 503 is fitted with the return spring 505 through a return lever through hole 5065 in the control circuit board 506 and abuts on spring holes 5191, 5192 (fig. 3B) provided in the isolation plate 519, respectively.

In an alternative embodiment, the trip assembly includes a trip coil 513, a magnetically permeable core 512 cooperating with the trip coil 513, and a trip device 516 that facilitates the connection or disconnection of the input assembly and the output assembly, as shown in fig. 4. A coil winding 5132 is wound around the middle leg of the trip coil 513, and when the coil is energized, a magnetic field is generated across the coil winding. Inside the coil winding 5132 is a coil inner hole 5131 for accommodating the magnetically permeable core 512 and allowing it to slide freely therein along the axial direction. The magnetic conductive iron core 512 is made of magnetic conductive metal material, and has magnetic conductive property, the front end of the magnetic conductive iron core is provided with an iron core clamping column 5121 and an iron core pulling plate 5122, and the tail end is provided with a tail end face 5123.

Optionally, the trip assembly further includes a magnetic conductive plate 514, the magnetic conductive plate 514 is sleeved on the trip coil 513 and is provided with a magnetic conductive plate hole 5141 through which the magnetic conductive iron core 512 passes, and the magnetic conductive plate hole 5141 is concentric with the coil inner hole 5131 of the trip coil 513, so that the magnetic conductive iron core 512 can pass through the magnetic conductive plate hole 5141 and freely slide in the coil inner hole 5131. When the input module is powered on and the reset module is operated, the end face 5123 of the tail portion of the magnetic core may be attached to the inner surface of the magnetic plate 514, i.e., the inner surface of the tail plate 5142 of the magnetic plate in fig. 4. As shown in fig. 5, the release 516 is provided with an L bracket 5161 and an N bracket 5162 for respectively supporting the elastic arms of the elastic contact arms 510 and 511 to move upward so that the electrostatic contacts on the contact arms 508 and 509 are in contact with the moving electrical contacts on the elastic contact arms 510 and 511.

According to the invention, the earth leakage protection device comprises a cut-off assembly which enables the reset assembly and the tripping assembly to be matched, and the cut-off assembly is arranged to enable: when the input assembly is powered on, the cut-off assembly can connect the reset assembly and the tripping assembly after operating the reset assembly and enable the tripping assembly to communicate the input assembly and the output assembly; when the input assembly is in power failure or leakage fault, the cut-off assembly cuts off the connection between the reset assembly and the tripping assembly and prompts the tripping assembly to cut off the input assembly and the output assembly, thereby ensuring the power utilization safety.

In an alternative embodiment, the severing assembly may include a latch plate mounted to the trip assembly and switchable between an initial state, a connected state, and a severing state, wherein: in an initial state, the latch plate is biased in a first direction toward the reset assembly by the resilient biasing member; in the connection state, the lock catch plate is biased in the first direction and is clamped with the reset assembly; in the cutting state, the locking plate pivots around the tripping assembly along a second direction opposite to the first direction and is separated from the clamping connection with the resetting assembly. In this way, the provision of the shut-off assembly does not lead to an increase in the overall dimensions of the product, but rather a safety in use is obtained in a compact constructive layout. It should be understood that the biasing force provided by the resilient biasing element is intended to cause the latch plate to have a tendency to engage the reset assembly, and is less than the force applied by the resilient contact arm to the trip unit, so that the latch plate may be disengaged from the reset assembly by the force of the resilient contact arm, but is less than the force with which the magnetically permeable core is attracted to the magnetically permeable plate in the energized state, so as not to interfere with the engagement of the latch plate with the reset assembly during normal use.

Specifically, in some embodiments, in conjunction with fig. 4, the latch plate 517 is configured to be driven by the magnetically permeable core 512 to be biased in a first direction and driven by the release 516 to pivot in a second direction. Here, as shown in the drawing, the first direction is a counterclockwise direction, and the second direction is a clockwise direction.

Referring to fig. 5, in an alternative embodiment, the top of latch plate 517 has a hook 5171 for engaging with a bayonet 5031 of the reset assembly (reset rod 503) so that reset rod 503 is hooked with latch plate 517. The bottom of the latch plate 517 has a notch 5174 at the middle position for the magnetically conductive iron core 512 to be snapped in, for example, the iron core snap column 5121 to be snapped in. Thus, when the magnetically permeable core 512 moves along the trip coil 513, the core pulling plate 5122 may pull the latch plate 517 such that the latch plate 517 is biased in the first direction. It should be appreciated that the notch 5174 of the latch plate is configured to have a suitable length for engaging the core catch 5121 of the magnetically permeable core 512, and also for preventing the latch plate 517 from disengaging from the core pulling plate 5122 of the magnetically permeable core 512 when the latch plate 517 moves upward along with the release 516.

In an alternative embodiment, as shown in fig. 7, the resilient biasing member may be a spring plate 515, which includes a spring leg 5152 fixed to the trip coil 513 and a central recess 5151 adapted to snap into the magnetically permeable core 512, for example, the central recess 5151 snaps onto the core snap post 5121 of the magnetically permeable core 512, and in an initial state, the spring plate 515 provides a small resilient force to the magnetically permeable core 512 away from the reset assembly (i.e., toward the tail of the magnetically permeable core).

In order to allow the latch plate 517 to be driven by the release 516 to pivot in the second direction, both sides of the middle portion of the latch plate 517 may be provided with latch plate shaft stubs 5172, 5173 adapted to be pivoted to the release 516, such as in the latch plate shaft slots 5165, 5166 shown in fig. 5, so that movement of the release 516 can cause the latch plate 517 to move and pivot therewith.

As can be further seen from fig. 5, the release 516 may be provided with limit guide bars 5163 and 5164, and the limit guide bars 5163 and 5164 may cooperate with the slide groove (not shown) provided on the intermediate bracket 507 to limit the moving direction and the moving stroke range of the release 516. In addition, the tripper 516 may further be provided with an indication piece mounting head 5167, and the indication piece mounting head 5167 is provided at the top end of the tripper 516 and may be used for the indication piece 504 (fig. 4) of the assembly state indication mechanism. The indicating plate 504 is made of soft elastic insulating material and has a marking color, such as green or red, one side of the indicating plate is provided with an indicating plate mounting hole 5041, and the indicating lamp plate mounting hole 5041 is sleeved on the indicating plate mounting head 5167 on the release 516, so that the indicating plate 504 can move up and down along with the release 516 to indicate the reset state or the release state of the product.

The operation and working principle of the earth leakage protection device of the present invention will be described with reference to fig. 8 to 11.

Fig. 8 shows the earth leakage protection device in a state where it is disconnected from the power supply, i.e., in a tripped state where the input terminal is not powered. At this time, the magnetic core 512 is acted by the spring 515 towards the tail of the core to make the core pulling plate 5122 pull the notch 5174 of the latch plate 517, and at the same time, due to the lever fulcrum action of the latch plate shaft heads 5172, 5173, the hook 5171 of the latch plate has a tendency to move towards the direction of the reset rod 503 and abuts against the side surface of the reset rod 503. In this state, the indicating piece 504 of the trip unit is at the lowest position and is not visible from the outside of the upper cover 2, and is shown in the non-operating state.

When the input terminal is not powered, if the reset button 5032 on the top of the reset rod 503 is pressed by 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 with the hook 5171 of the latch plate 517, the latch plate 517 is under the elastic force of the spring 515 transmitted by the magnetic core 512, so that the hook 5171 and the bayonet 5031 are clamped together, as shown in fig. 9. At this time, the finger is released, and the reset rod 503 moves upward under the resilience of the reset spring 505 and drives the latch plate 517 and the release 516 to move upward together. When the trip device 516 is moved to a certain position, the L bracket 5161 and the N bracket 5162 of the trip device 516 are subjected to the downward elastic force of the elastic contact arms 510 and 511 and act on the latch plate 517, so that the latch plate 517 generates a torsional moment in the second direction (clockwise direction) with the latch plate shaft heads 5172 and 5173 as axes. The clockwise torque can overcome the elastic force of the spring leaf 515 to rotate the latch plate 517 clockwise along the axial direction of the latch plate shaft head, i.e. the hook 5171 of the latch plate is disengaged from the bayonet 5031 of the reset rod. Further, the return lever 503 continues to move upward to the initial position by the resilient force of the return spring 505. Meanwhile, the release 516 carries the latch plate 517 to move downward to the initial position under the downward elastic force of the elastic contact arms 510 and 511, that is, the reset fails, and the product returns to the release state shown in fig. 8.

When the input end is in a charged state, namely a plug is inserted into a socket, the input end of the plug is charged. When the reset button on the top of the reset rod 503 is pressed by 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 latch plate, the latch plate 517 makes the hook 5171 and the bayonet 5031 snap together under the action of the elastic force of the spring 515 transmitted from the magnetic core 512, as shown in fig. 9. Meanwhile, because the trip coil 513 is in the energized state, the coil on the trip 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 resilience of the reset spring 505 and drives the latch plate 517 and the release 516 to move upward together. When the release device is moved to a certain position, the L bracket 5161 and the N bracket 5162 of the release device 516 are transmitted to the latch plate 517 by the downward elastic force of the elastic contact arms 510 and 511, so that the latch plate 517 generates a clockwise torsion moment about the latch plate shaft heads 5172 and 5173. However, at this time, the clockwise torque cannot overcome the resultant force of the elastic force of the spring 514 and the magnetic force generated by the coil, so that the latch plate 517 cannot rotate clockwise along the axial direction of the latch plate shaft head, i.e. the hook 5171 of the latch plate and the bayonet 5031 of the reset rod cannot be disengaged, the reset rod 503 continues to move upward under the resilient force of the reset spring 505 and drives the release 516 to overcome the downward elastic force of the elastic contact arms 510 and 511, and finally the moving electrical contacts of the elastic contact arms 510 and 511 are in contact conduction with the electrostatic contacts of the contact arms 508 and 509, i.e. the reset is successful, as shown in fig. 10. In this state, the indicating piece 504 of the trip unit is at the highest position, and the color of the indicating piece 504 is visible from the outside of the upper cover 2, and is displayed as an operating state.

As can be seen from the above description in conjunction with fig. 11, when the input terminal L, N is powered on, the trip coil 513(SOL) generates a magnetic field, but due to the structural limitations of the cutoff assembly, the product power supply cannot be powered on and is always maintained in the tripped state shown in fig. 8. The power supply shown in fig. 10 is only turned on when the reset button is pressed and the input terminal is charged, and the cutoff assembly is freed from space. Therefore, the leakage protection device skillfully utilizes the cutting-off component to realize the improvement of the safety performance.

When the transformer 518(CT) detects leakage, a leakage current signal is transmitted to the processor U1, and once the leakage current is greater than a set value, the transistor Q1 is triggered to be turned on, and after Q1 is turned on, the operating potential of the SOL is pulled low, so that a magnetic field cannot be effectively generated, and the power supply can be cut off by the cut-off component. In addition, when the N line of the power supply is powered off, the power supply is cut off due to the power loss of the SOL.

Specifically referring to fig. 8 and 10, in the reset state of fig. 10, when the test button 5013 is pressed down, the trip coil 513 is powered off, and the electromagnetic force originally acting on the magnetic conductive core 512 disappears, at this time, because the L bracket 5161 and the N bracket 5162 on the trip 516 are subjected to the downward elastic force of the elastic contact arms 510 and 511 and act on the latch plate 517, the latch plate 517 generates a clockwise torsion moment with the latch plate spindle heads 5172 and 5173 as axes. Similarly, the clockwise torque can overcome the elastic force of the spring 514, so that the latch plate 517 can rotate clockwise along the latch plate shaft head axis, i.e. the hook 5171 of the latch plate disengages from the bayonet 5031 of the reset rod, and the reset rod 503 moves upward to the initial position under the resilient force of the reset spring 505. The release 516 carries the latch plate 517 to move downward to the initial position under the downward elastic force of the elastic contact arms 510 and 511, so that the moving electrical contacts of the elastic contact arms 510 and 511 are separated from the electrostatic contacts of the contact arms 508 and 509, i.e., the product is released, and the state shown in fig. 8 is returned.

It is to be understood herein that the embodiments shown in the figures show only alternative shapes, sizes and arrangements of the various optional components of the earth leakage protection device according to the invention, which are, however, merely illustrative and not restrictive, and that other shapes, sizes and arrangements may be adopted without departing from the spirit and scope of the invention.

While the technical content and the technical features of the invention have been disclosed, it is understood that various changes and modifications of the disclosed concept can be made by those skilled in the art within the spirit of the invention, and the invention is not limited thereto. The above description of embodiments is intended to be illustrative, and not restrictive, and the scope of the invention is defined by the appended claims.

Claims (16)

1. An earth leakage protection device, including the casing with set up in the core assembly in the casing, the core assembly includes control circuit board, and with input assembly and output assembly that control circuit board is coupled, its characterized in that, earth leakage protection device includes reset assembly, dropout subassembly, and makes reset assembly and dropout subassembly matched with cut off the subassembly, it is set up to so to cut off the subassembly:

when the input assembly is powered on, the cut-off assembly connects the reset assembly and the tripping assembly after operating the reset assembly and enables the tripping assembly to communicate the input assembly and the output assembly;

when the input assembly is powered off or has an electric leakage fault, the cut-off assembly cuts off the connection between the reset assembly and the tripping assembly and prompts the tripping assembly to cut off the input assembly and the output assembly.

2. A residual current device as claimed in claim 1, characterized in that said trip assembly comprises a latch plate and a resilient biasing member, said latch plate being mounted to said trip assembly and being switchable between an initial state, a connected state and a switched-off state, wherein:

in the initial state, the strike plate is biased in a first direction toward the reset assembly by the resilient biasing member;

in the connection state, the lock catch plate is biased in a first direction and is clamped with the reset assembly;

in the cutting-off state, the lock catch plate pivots around the tripping assembly along a second direction opposite to the first direction and is separated from the clamping connection with the reset assembly.

3. A residual current device as claimed in claim 2, characterized in that said trip unit comprises a trip coil, a magnetically permeable core cooperating with said trip coil, and a trip unit for bringing said input unit and said output unit into communication or out of communication, said latch plate being arranged to be driven by said magnetically permeable core to be biased in said first direction and by said trip unit to be pivoted in said second direction.

4. An earth leakage protection device according to claim 3, wherein the locking plate is provided with a notch for the magnetic core to be clamped into, the notch is configured to bias the locking plate along the first direction when the magnetic core moves along the trip coil, and the locking plate further comprises a hook adapted to be clamped with a bayonet provided on the reset component.

5. An earth leakage protection device according to claim 3, characterized in that the resilient biasing member is a spring leaf comprising a spring foot fixed to the trip coil and a central notch adapted to snap into the magnetically permeable core, the resilient biasing member exerting a force on the magnetically permeable core in the initial state, which force is directed away from the reset assembly.

6. A residual current device as claimed in claim 3, characterized in that said latch plate further comprises a latch plate stub shaft adapted to be pivoted to said trip unit so as to move and pivot with said trip unit.

7. The earth leakage protection device of claim 3, wherein the trip unit comprises a magnetic conductive plate, the magnetic conductive plate is sleeved on the trip coil and provided with a magnetic conductive plate hole for the magnetic conductive iron core to pass through, the magnetic conductive plate hole is concentric with the coil inner hole of the trip coil, and when the input unit is powered on and the reset unit is operated, the end surface of the magnetic conductive iron core is adsorbed on the inner surface of the magnetic conductive plate.

8. A residual-current protection device according to claim 3, characterized in that it comprises an intermediate bracket for receiving and assembling said input assembly, said output assembly and said movement assembly, wherein said release is provided with a limiting guide bar, said limiting guide bar is matched with a sliding groove arranged on said intermediate bracket to limit the moving direction and the moving stroke range of said release.

9. A residual current device as claimed in claim 3, characterized in that said residual current device comprises a status display means comprising an indicator tab connected to said trip unit and adapted to be observed from outside said casing.

10. A residual current device as claimed in claim 1, characterized in that said reset assembly comprises a reset button protruding outside said casing, said residual current device comprising a button cap made of an elastic insulating material, said button cap being adapted to protrude outside said casing and having a reset cap covering said reset button.

11. A residual current device as claimed in claim 10, characterized in that the residual current device comprises a test assembly, which comprises a test button formed on the button cap, to which a button pin is connected, which button pin is switchable between an on-state and an off-state via operation of the test button, wherein:

in the conducting state, the test button is pressed to enable the button nail to be conducted with a test contact on the control circuit board;

in the off state, the test button is elastically reset so that the button nail is disconnected from the test contact on the control circuit board.

12. An earth leakage protection device according to claim 10, characterized in that said earth leakage protection device comprises an inner cover made of transparent insulating material and arranged between said button cap and said control circuit board to support said button cap, said inner cover is provided with through holes for said reset assembly and said test assembly to pass through, and with light guide posts corresponding to said indicator sheet, said button cap is provided with through holes for said light guide posts to pass through.

13. An earth leakage protection device according to claim 1, characterized in that the housing comprises a base and an upper cover, which are positioned by means of a snap-fit arrangement and are secured to each other via a threaded fastener, wherein the upper cover is provided with a counter bore for passing through the threaded fastener, the counter bore being provided with a hole plug.

14. A residual current device according to claim 1, characterized in that said input assembly comprises a pair of contact arms, each provided with an electrostatic contact, said contact arms being connected to a respective pair of pins via input connection lines; the output assembly includes a pair of resilient contact arms, each resilient contact arm being provided with an electrical contact for mating with the electrostatic contact, the resilient contact arms and output terminals being coupled to the control circuit board, respectively.

15. A residual current device according to claim 14, characterized in that said residual current device comprises a transformer assembly coupled to said control circuit board, said input connection line passing through said transformer assembly to connect with said contact arm and said pin.

16. A residual current device according to claim 15, characterized in that it comprises a separation plate arranged at the bottom of the mutual inductor assembly and provided with a through hole for receiving the mutual inductor assembly.

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