A high-power GFCI intelligent leakage protection plug

Abstract

The present invention discloses a high-power GFCI intelligent leakage protection plug, including a leakage detection device, a driving device and a PCB circuit board. When the leakage detection device detects leakage, the driving device is activated to disconnect the circuit. The driving device includes a coil and a driving rod. The coil inputs current to drive the driving rod to move, so that the moving contact is connected or disconnected with the static contact. It also includes a permanent magnet component. The position of the permanent magnet component makes the permanent magnet component and the driving rod magnetically attracted and held when the moving contact and the static contact are connected. A high-power GFCI intelligent leakage protection plug of the present invention uses the coil to energize the driving rod to generate electromagnetic force to drive the moving contact and the static contact to close. The driving rod contacts the magnet block. After the coil is powered off, it remains closed under the magnetic force between the magnet block and the driving rod. When the leakage detection device detects leakage, the control circuit controls the coil to pass a reverse current, and the moving and static contacts are separated.

Description

Technical Field

[0001] The invention relates to a high-power GFCI intelligent leakage protection plug. Background Art

[0002] The high-power GFCI intelligent leakage protection plug is a plug with leakage protection function for high-power electrical equipment supplied to the North American market, such as common high-power electrical appliances such as electric water heaters. The principle adopted by the existing low-voltage leakage protection plug is to use a current sensor to detect the current flowing through. When leakage is detected, it is tripped by electromagnetic means to protect the personal safety of the user. After tripping, it needs to be reset so that the dynamic and static contacts can be connected for normal use. It is usually reset by mechanical or electromagnetic means. When the electromagnetic reset is used, the coil needs to be continuously energized or a locking structure is used to maintain it. Through clever design, another electromagnetic coil is used to drive the unlocking mechanism to unlock, and then the power is tripped and cut off. The structures of the above two methods are relatively complicated. Summary of the invention

[0003] In view of the above shortcomings, the object of the present invention is to provide a GFCI intelligent leakage protection plug with simple and reliable structure.

[0004] To this end, a high-power GFCI intelligent leakage protection plug of the present invention includes a leakage detection device, a driving device and a PCB circuit board. When the leakage detection device detects leakage, the driving device is activated to disconnect the circuit. The driving device includes a coil and a driving rod. The coil inputs current to drive the driving rod to move, so that the moving contact is connected or disconnected with the static contact. It also includes a permanent magnet component. The position of the permanent magnet component makes the permanent magnet component and the driving rod magnetically attracted and maintained when the moving contact and the static contact are connected.

[0005] Furthermore, the first end of the driving rod is connected to a movable bracket, a moving contact is provided on the movable bracket, and the static contact is provided in the direction of the moving contact toward the second end of the driving rod, so that the movable bracket moves toward the direction of the second end of the driving rod to connect the moving contact and the static contact, and the permanent magnet assembly cooperates with the second end of the driving rod.

[0006] Furthermore, it includes a fixed bracket, which includes a coil tube, a coil is arranged inside the coil tube, the coil tube and the coil are coaxially sleeved on the driving rod, one end of the coil tube is connected to the installation slot of the permanent magnet component, and a circular sheet permanent magnet is arranged in the installation slot.

[0007] Furthermore, the other end of the coil tube is connected to a static contact fixing plate, the upper end of the fixing plate is connected to a support frame, the support frame is arranged above the movable bracket, and a clamping foot is arranged on the support frame to clamp with the PCB circuit board.

[0008] Furthermore, a limit groove is provided on the movable bracket, the limit block is inserted into the limit groove, a hole is provided in the middle of the limit block, the first end of the driving rod extends into the hole of the limit block, and the first end of the driving rod is provided with a groove to be engaged with the limit block.

[0009] Furthermore, a slide groove is arranged on the support frame, and an outward extension section is arranged on the upper end of the limit block, and the extension section extends to the surface of the slide groove, so that the movable bracket slides along the slide groove.

[0010] Furthermore, it also includes a plug fixing seat, the fixing bracket is arranged in the plug fixing seat, the plug fixing seat includes plug assembly limit strips on both sides, and a gap is provided between the limit strips and the plug fixing seat body for the plug through assembly to pass through, the plug assembly is bent on the lower surface of the plug fixing seat and extends to the side of the plug fixing seat, and extends from the gap to the static contact fixing plate to form a static contact piece, and the static contact is fixed on the static contact piece.

[0011] Furthermore, the leakage detection device includes a current transformer, the moving contact is connected to the wiring copper component, the wiring copper component includes a wiring terminal, the wiring terminal is connected to a connecting copper sheet, and the connecting copper sheet connected to the neutral wire and the live wire passes through the current transformer.

[0012] Furthermore, a partition is used in the middle of the current transformer to separate the connecting copper sheets connecting the live wire and the neutral wire.

[0013] Furthermore, it also includes a test button and a reset button, which are installed on the shell, the shell is fixed to the base, the leakage detection device, the PCB circuit board and the drive device are installed in the cavity of the shell and the base, and the middle frame is connected between the base and the shell.

[0014] Beneficial technical effects of the present invention:

[0015] The invention discloses a high-power GFCI intelligent leakage protection plug, wherein the driving device includes a coil, and when the coil is energized, the driving rod generates electromagnetic force to drive the moving contact and the static contact to close, and the second end of the driving rod contacts the magnet. After the coil is powered off, the coil remains closed under the magnetic force between the magnet and the driving rod. When the leakage detection device detects leakage, the control circuit controls the coil to pass a reverse current, and the driving rod moves in the reverse direction under the action of the electromagnetic force, and the moving and static contacts are separated.

[0016] In a specific embodiment of the present invention, a driving rod is arranged in a fixed bracket, one end of the driving rod is connected to a movable bracket, the movable bracket is connected to the first end of the driving rod through a limit block, and an extension section is arranged at the upper end of the limit block to cooperate with a slide groove of a support frame on the fixed bracket, so that the movable bracket can move stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1A schematic diagram of a specific embodiment of the present invention;

[0018] Figure 2 is a top view schematic diagram of the internal structure of the plug;

[0019] Figure 3 for Figure 2 A cross-sectional schematic diagram of

[0020] Figure 4 is a schematic diagram of a driving rod, a movable bracket and a wiring terminal;

[0021] Figure 5 is a schematic diagram of a fixing bracket;

[0022] Figure 6 is a top view of the fixing bracket;

[0023] Figure 7 for Figure 6 A cross-sectional schematic diagram of

[0024] Figure 8 It is a schematic diagram of the combination of the fixed bracket, the movable bracket and the driving rod.

[0025] Explanation of the reference numerals: 1. shell; 101. housing; 102. middle frame; 103. base; 2. PCB circuit board; 3. driving device; 301. driving rod; 3011. first end; 3012. second end; 302. fixing bracket; 3021. coil tube; 303. movable bracket; 3031. limiting groove; 3032. limiting block; 3033. extension section; 304. moving contact piece; 305. mounting groove; 306. tailstock; 307. static contact fixing plate; 308. supporting frame; 3081. slide groove; 309. static contact piece; 4. leakage detection device; 401. partition; 5. card foot; 6. plug fixing seat; 601. limiting strip; 7. plug copper component; 8. wiring copper component; 801. wiring terminal; 802. connecting copper piece; 9. test button; 10. reset button; 11. plug pin. DETAILED DESCRIPTION

[0026] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0027] Reference Figures 1 to 8As shown, a high-power GFCI intelligent leakage protection plug of the present invention includes a leakage detection device 4, a drive device 3 and a PCB circuit board 2. When the leakage detection device 4 detects leakage, the drive device 3 is actuated to disconnect the circuit. The drive device 3 includes a coil and a drive rod 301. The drive rod 301 is driven to move by inputting current into the coil, so that the moving contact is connected or disconnected with the static contact. The drive device 3 also includes a permanent magnet component. The position of the permanent magnet component makes the permanent magnet component and the drive rod 301 magnetically attracted and held when the moving contact is connected with the static contact. The common leakage detection device 4 uses a zero-sequence current transformer, including a coil, and the live wire and the neutral wire pass through the coil. When leakage occurs, there will be a difference in the current on the live wire and the neutral wire. The current transformer can detect the difference in the current on the live wire and the neutral wire. The control components integrated on the PCB circuit board 2 can receive the leakage signal and control the drive device 3 to disconnect the circuit. The drive device 3 includes a coil and a coaxially arranged metal drive rod 301. When current is passed through the coil, the drive rod 301 moves under the action of electromagnetic force and brings the moving contact into contact with the static contact, and the circuit of the plug is connected. At the same time, the drive rod 301 contacts the permanent magnetic assembly, which uses a magnet block. The magnetic attraction of the permanent magnetic assembly acts on the drive rod 301, so that the moving contact and the static contact remain in contact. Under the action of the permanent magnetic assembly, the coil does not need to be powered on or use other locking devices to keep the switch closed. The above-mentioned leakage detection device 4, driving device 3 and PCB circuit board 2 are installed in the cavity of the plug shell 1. The shell 1 includes an upper shell 101 and a lower base 103. The base 103 and the shell 101 are connected to the middle frame 102. The shell 1 is made of plastic, and the middle frame 102 is made of metal material for support. The base 103, the shell 101, and the middle frame 102 are fixed with bolts. The wire extends from the rear of the shell 101 and is connected to the terminal 801 of the wiring copper component 8. The terminal 801 is respectively connected to the neutral wire, the live wire or the ground wire. The terminal 801 is connected to the moving contact, and the static contact is connected to the pin 11. The pin 11 is arranged below the driving component, and the overall structure of the plug is compact.

[0028] The structure of the drive device 3 is shown in FIG. Figures 2 to 8As shown, it mainly includes a driving rod 301 and a fixed bracket 302. The fixed bracket 302 includes a coil tube 3021, in which a coil is arranged. The rod body of the driving rod 301 is arranged in the coil tube 3021. In this embodiment, the coil tube and the driving rod are coaxially arranged. The first end 3011 of the driving rod 301 is connected to the movable bracket 303. Specifically, the movable bracket 303 includes a longitudinal plate, in which a longitudinally arranged limiting groove 3031 is opened. The limiting groove 3031 adopts a dovetail groove, and a limiting block 3032 matched with it is inserted into the dovetail groove. The limiting block 3032 is clamped with the first end 3011 of the driving rod. The limiting block 3032 is provided with a hole at the position where the first end 3011 of the driving rod cooperates. The first end 3011 of the driving rod adopts a step rod structure, and a groove is arranged at the first end 3011. The first end 3011 extends into the hole and can also be fixed with a nut. The connecting copper sheet 802 of the wiring copper component 8 passes through the current transformer, and the two ends of the longitudinal plate of the movable bracket 303 are provided with sheet copper components to form a moving contact piece 304. The moving contact can be fixed on the moving contact piece 304. The moving contact piece 304 and the wiring copper component 8 can be connected by a wire, and the wire is reserved for a certain length to adapt to the movement of the movable bracket 303. Preferably, one end of the coil tube 3021 of the fixed bracket is connected to the mounting groove 305 of the permanent magnet component, and the surface of the second end 3012 of the driving rod cooperates with the permanent magnet component. The mounting groove 305 can be set in the column, and the shape of the mounting groove 305 is cylindrical. The mounting groove 305 is connected with the coil tube 3021. A circular magnet block is set in the mounting groove 305. A detachably connected tailstock 306 can be installed at the tail of the mounting groove 305. The tailstock 306 and the mounting groove 305 cooperate to fix the magnet block. Preferably, the other end of the coil tube 3021 of the fixed bracket is connected with a static contact fixing plate 307, the movable bracket 303 is arranged outside the static contact fixing plate 307, the driving rod 301 passes through the static contact fixing plate 307, the static contact is arranged on the static contact fixing plate, and the upper end of the static contact fixing plate 307 is connected to the support frame 308. The movable bracket 303 of this embodiment is arranged on the first end of the driving rod 301, and the fulcrum of the torque is at one end of the coil tube 3021. During the movement, one end of the movable bracket 303 sags under the influence of the torque, and the support frame 308 can be used to provide a supporting force to support the movable bracket 303 to move along a predetermined path. Specifically, support frames 308 are arranged on both sides of the static contact fixing plate 307, and the support frames 308 are arranged above the movable bracket 303. The support frames 308 are provided with clamping feet 5 to clamp with the PCB circuit board 2. Space is reserved between the support frames 308 on both sides, and the width of the reserved space is matched with the width of the upper part of the limit block 3032 of the movable bracket 303. The upper part of the limit block 3032 is provided with an extension section 3033 outwardly, and a slide groove 3081 is provided on the support frame 308. The slide groove 3081 cooperates with the extension section 3033, so that the movable bracket 303 can move stably along the slide groove 3081.In this embodiment, when the leakage detection device 4 detects leakage, the coil in the fixed bracket 302 inputs a reverse current, the driving rod 301 is separated from the magnet block by the reverse electromagnetic force, and the driving rod 301 drives the movable bracket 303, so that the moving contact and the static contact are separated. When the movable bracket 303 moves to the vicinity of the leakage detection device 4 adjacent to it, the second end 3012 of the driving rod 301 maintains a long distance from the permanent magnet assembly, the magnetic attraction of the permanent magnet assembly is very small and can be ignored, and the moving contact and the static contact remain separated.

[0029] In the above embodiment, referring to Figure 2 and Figure 4 As shown, it also includes a plug fixing seat 6, a fixing bracket 302 is arranged in the plug fixing seat 6, the plug fixing seat 6 includes plug component limiting strips 601 on both sides, and a gap is provided between the limiting strips 601 and the plug fixing seat body for the plug copper component 7 to pass through, the plug copper component is connected to the pin 11, and the pin 11 is fixed on the lower surface of the plug fixing seat 6, the plug through component extends from the lower surface of the plug fixing seat 6 to the side of the plug fixing seat 6, and extends from the gap to the static contact fixing plate 307 to form a static contact piece 309, and the static contact is fixed on the static contact piece 309.

[0030] In the above embodiment, referring to Figure 2 As shown, it also includes a current transformer, the moving contact is connected to the copper component of the terminal 801, the wiring copper component 8 includes the terminal 801, the terminal 801 is connected to the connecting copper sheet 802, the connecting copper sheet 802 connected to the neutral line and the live line passes through the current transformer, and the connecting copper sheet 802 connecting the live line and the neutral line is separated by a partition 401 in the middle of the current transformer.

[0031] In the above embodiment, referring to Figure 1 As shown, a test button 9 and a reset button are also included. The test button 9 and the reset button 10 are installed on the housing 101. The test button 9 and the reset button 10 can be set according to the prior art.

[0032] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A high-power GFCI intelligent leakage protection plug, comprising a leakage detection device, a driving device and a PCB circuit board. When the leakage detection device detects leakage, the driving device is activated to disconnect the circuit, characterized in that: The driving device comprises a coil and a driving rod, the coil inputs current to drive the driving rod to move, so that the moving contact is connected or disconnected with the static contact, and further comprises a permanent magnet component, the position of the permanent magnet component makes the permanent magnet component and the driving rod magnetically attracted and held when the moving contact and the static contact are connected; The first end of the driving rod is connected to the movable bracket, and the movable bracket is provided with a moving contact, and the static contact is provided in the direction of the moving contact toward the second end of the driving rod, so that the movable bracket moves toward the direction of the second end of the driving rod to connect the moving contact and the static contact, and the permanent magnet assembly cooperates with the second end of the driving rod; It includes a fixed bracket, the fixed bracket includes a coil tube, a coil is arranged in the coil tube, the coil tube and the coil are coaxially sleeved on the driving rod, one end of the coil tube is connected to the mounting groove of the permanent magnet assembly, and a circular sheet permanent magnet is arranged in the mounting groove; The other end of the coil tube is connected to a static contact fixing plate, the upper end of the fixing plate is connected to a support frame, the support frame is arranged above the movable bracket, and a clamping foot is arranged on the support frame to clamp with the PCB circuit board; The movable bracket is provided with a limit groove, the limit block is clamped in the limit groove, a hole is provided in the middle of the limit block, the first end of the driving rod extends into the hole of the limit block, and the first end of the driving rod is provided with a groove clamped with the limit block; A slide groove is arranged on the support frame, and an outward extension section is arranged on the upper end of the limit block, and the extension section extends to the surface of the slide groove so that the movable bracket slides along the slide groove; It also includes a plug fixing seat, the fixing bracket is arranged in the plug fixing seat, the plug fixing seat includes plug component limiting strips on both sides, and a gap is provided between the limiting strips and the plug fixing seat body for the plug through component to pass through, the plug component is bent on the lower surface of the plug fixing seat and extends to the side of the plug fixing seat, and extends from the gap to the static contact fixing plate to form a static contact piece, and the static contact is fixed on the static contact piece.

2. A high-power GFCI intelligent leakage protection plug according to claim 1, characterized in that: The leakage detection device comprises a current transformer, a moving contact is connected to a wiring copper component, the wiring copper component comprises a wiring terminal, the wiring terminal is connected to a connecting copper sheet, and the connecting copper sheet connected to the neutral line and the live line passes through the current transformer.

3. A high-power GFCI intelligent leakage protection plug according to claim 2, characterized in that: The connecting copper sheet connecting the live wire and the neutral wire is separated by a partition in the middle of the current transformer.

4. A high-power GFCI intelligent leakage protection plug according to claim 1, characterized in that: It also includes a test button and a reset button, which are installed on the shell. The shell is fixed to the base. The leakage detection device, PCB circuit board and drive device are installed in the cavity of the shell and the base. The base and the shell are connected to the middle frame.

Images