Leakage protection plug

Abstract

The utility model relates to a leakage protection plug which comprises a shell, a mounting seat is arranged in the shell, a pin assembly is arranged on the mounting seat, the upper part of the mounting seat is connected with a circuit board with a test circuit and / or a self-checking circuit, two sides of the mounting seat are provided with a pair of static contact pieces and a pair of movable contact pieces corresponding to the static contact pieces, and the movable contact pieces are connected with the test circuit and / or the self-checking circuit. The mounting seat is further provided with a mutual inductor and a lock catch coil assembly, one end of the static contact piece is electrically connected with the pin assembly, and the other end of the static contact piece penetrates through the mutual inductor and is connected with the circuit board, so that the test circuit and / or the self-checking circuit can form a closed loop through the static contact piece. The utility model is characterized in that the static contact piece passes through the mutual inductor, and the static contact piece is used as a part of a current path, so that the test circuit and the self-checking circuit can directly form a closed loop through the static contact piece, and the utility model has the advantages of simplifying internal wiring, improving installation and maintenance efficiency, and optimizing space utilization rate.

Description

Technical Field

[0001] This utility model relates to the field of plug technology, specifically to a leakage protection plug. Background Technology

[0002] As an important electrical safety device, residual current circuit breaker (RCCB) is widely used in home and industrial environments. It detects current imbalance in the circuit through a current transformer and quickly disconnects the power supply when leakage is detected, thereby preventing possible personal injury or equipment damage.

[0003] In traditional residual current circuit breakers (RCCBs), the current transformer is typically installed on the side closest to the load and connected to multiple lines to enable the corresponding functions. However, existing test circuits, self-test circuits, and other circuits require wires to work with the current transformer, increasing the complexity of internal wiring and affecting the ease of installation and maintenance. Utility Model Content

[0004] The purpose of this invention is to provide a leakage protection plug to solve the above-mentioned problems.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a leakage current protection plug, including a housing, a mounting base inside the housing, a pin assembly with one end passing through the housing on the mounting base, a circuit board with a test circuit and / or self-test circuit connected to the upper part of the mounting base, a pair of stationary contacts and a pair of moving contacts corresponding to the stationary contacts on both sides of the mounting base, a current transformer and a locking coil assembly that can separate the moving contacts from the stationary contacts after the current transformer detects leakage current, one end of the stationary contact is electrically connected to the pin assembly, and the other end of the stationary contact passes through the current transformer and is connected to the circuit board, so that the test circuit and / or self-test circuit can form a closed loop through the stationary contact.

[0006] As a further optimization of this utility model, the pin assembly includes a first pin and a second pin, with one end of the first pin and the second pin extending to the circuit board and electrically connected to the corresponding stationary contact.

[0007] As a further optimization of this utility model, the housing is connected to a test button that can move in a vertical direction, the circuit board has a test circuit, one end of the test button extends out of the housing, and when the test button moves downward, it is electrically connected to the circuit board and conducts the test circuit.

[0008] As a further optimization of this utility model, the latch coil assembly includes a latch coil electrically connected to a circuit board and a pressure rod capable of moving up and down. The latch coil has an iron core capable of moving left and right. The iron core is connected to a buckle plate assembly capable of moving up and down and driving the movable contact piece upward when moving upward. The pressure rod has a support part that can cooperate with the buckle plate assembly to support the buckle plate assembly. The pressure rod is connected to a first elastic element that drives the pressure rod to move upward. The iron core is connected to a second elastic element that drives the iron core to move to the left. When the latch coil is energized, it can drive the iron core to move to the right, thereby causing the buckle plate assembly to separate from the support part.

[0009] As a further optimization of this utility model, the buckle assembly includes a buckle plate and a crossbeam disposed at the lower part of the buckle plate, wherein the lower part of the movable contact piece abuts against the upper part of the crossbeam.

[0010] As a further optimization of this utility model, a reset button is connected to the upper part of the pressure rod, and one end of the reset button extends out of the housing.

[0011] As a further optimization of this utility model, the locking coil assembly is located on the right side of the mounting base, the mounting base has a buckle on the left side, and the current transformer has a slot that cooperates with the buckle.

[0012] As a further optimization of this utility model, a contact plate seat is connected to the right side of the mounting base. The contact plate seat has two mounting grooves arranged in the vertical direction. One end of the movable contact plate passes through the mounting groove and is connected to the circuit board.

[0013] Compared with the prior art, the present invention has the following advantages: by setting the stationary contact piece through the current transformer and using the stationary contact piece as part of the current path, the test circuit and the self-test circuit can directly form a closed loop through the stationary contact piece, which has the advantages of simplifying internal wiring, improving installation and maintenance efficiency, and optimizing space utilization. Attached Figure Description

[0014] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0015] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0016] Figure 2 This is an exploded view of the present invention;

[0017] Figure 3 This is a cross-sectional view of the present invention;

[0018] Figure 4 This is a schematic diagram of the structure of this utility model;

[0019] Figure 5 This is an exploded view of the locking coil assembly in this utility model;

[0020] Figure 6 This is a schematic diagram showing the cooperation between the current transformer and the stationary contact in this utility model;

[0021] Figure 7 This is a three-dimensional schematic diagram of the present invention with the shell omitted;

[0022] Figure 8 This is a schematic diagram of the electrical principle of this utility model. Detailed Implementation

[0023] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0024] like Figures 1 to 8 As shown, this utility model discloses a leakage current protection plug, including a housing 1, a mounting base 2 inside the housing 1, a pin assembly 3 with one end passing through the housing 1 on the mounting base 2, a circuit board 4 with a test circuit and / or self-test circuit connected to the upper part of the mounting base 2, a pair of stationary contacts 5 and a pair of moving contacts 6 corresponding to the stationary contacts 5 on both sides of the mounting base 2, a current transformer 7 and a locking coil assembly 8 that can separate the moving contacts 6 from the stationary contacts 5 after the current transformer 7 detects leakage current, one end of the stationary contact 5 is electrically connected to the pin assembly 3, and the other end of the stationary contact 5 passes through the current transformer 7 and is connected to the circuit board 4, so that the test circuit and / or self-test circuit can form a closed loop through the stationary contact 5.

[0025] like Figure 8 As shown, in one embodiment, the circuit integrates a self-test circuit A and a test circuit B, wherein the self-test circuit can periodically check the working status of the equipment, and the test circuit allows the user to manually test the leakage protection function.

[0026] The stationary contact 5 passes through the current transformer 7, enabling the current transformer 7 to monitor the current difference between the stationary contacts 5. This allows the test circuit and self-test circuit, which form a closed loop with the stationary contacts 5, to perform their respective functions. One end of the stationary contact 5 is electrically connected to the pin assembly 3, ensuring the self-test circuit has continuous self-testing capability. In the event of leakage, the latching coil assembly 8 causes the moving contact 6 to disengage from the stationary contact 5, cutting off the current supply.

[0027] In one embodiment, the self-test circuit includes a timing circuit and a built-in microcontroller, which enables the self-test circuit to periodically activate a test current small enough not to cause an actual trip but sufficient to be caught by the current transformer 7, thereby confirming the sensitivity of the current transformer 7.

[0028] By setting the stationary contact 5 through the current transformer 7 and using the stationary contact 5 as part of the current path, the test circuit and the self-test circuit can directly form a closed loop through the stationary contact 5, which has the advantages of simplifying internal wiring, improving installation and maintenance efficiency, and optimizing space utilization.

[0029] The pin assembly 3 includes a first pin 31 and a second pin 32. One end of the first pin 31 and the second pin 32 extends to the circuit board 4 and is electrically connected to the corresponding stationary contact 5. The first pin 31 and the second pin 32 can be directly connected to the stationary contact 5 by soldering or crimping, thereby forming part of the current path from the power grid to the load side.

[0030] The housing 1 is connected to a test button 9 that can move vertically. The circuit board 4 has a test circuit. One end of the test button 9 extends out of the housing 1, and when the test button 9 moves downward, it is electrically connected to the circuit board 4 and conducts the test circuit. When the test button 9 is pressed, its electrical connection with the circuit board 4 is activated, thereby conducting the test circuit.

[0031] In one embodiment, after the test button 9 is pressed, the test circuit sends a test current. After the current transformer 7 detects the test current, it causes the moving contact 6 to disengage from the stationary contact 5 through the latching coil assembly 8, thereby completing the test on whether the latching coil assembly 8 is working properly.

[0032] The latch coil assembly 8 includes a latch coil 81 electrically connected to the circuit board 4, and a pressure rod 82 that can move up and down. The latch coil 81 has an iron core 83 that can move left and right. The iron core 83 is connected to a buckle plate assembly 84 that can move up and down and can move the movable contact piece 6 upward when it moves upward. The pressure rod 82 has a support part 821 that can cooperate with the buckle plate assembly 84 to support the buckle plate assembly 84. The pressure rod 82 is connected to a first elastic element 85 that drives the pressure rod 82 to move upward. The iron core 83 is connected to a second elastic element 86 that drives the iron core 83 to move to the left. When the latch coil 81 is energized, it can drive the iron core 83 to move to the right, thereby causing the buckle plate assembly 84 to separate from the support part 821.

[0033] When the latching coil 81 is energized, the iron core 83 moves to the right, causing the latching plate assembly 84 to separate from the support part 821. This causes the latching plate assembly 84 to lose its support and move downwards, separating the moving contact 6 from the stationary contact 5, thus cutting off the circuit. The first elastic element 85 is used to move the pressure rod 82 upwards, and the second elastic element 86 is used to reset the iron core 83, ensuring that the latching coil assembly 8 can return to its initial state after power is cut off.

[0034] The buckle assembly 84 includes a buckle plate 841 and a crossbeam 842 disposed at the lower part of the buckle plate 841. The lower part of the movable contact piece 6 abuts against the upper part of the crossbeam 842. With the crossbeam 842, when the buckle plate 841 moves upward, the crossbeam 842 will drive the movable contact piece 6 to move upward together, thereby realizing the contact between the movable contact piece 6 and the stationary contact piece 5.

[0035] A reset button 822 is connected to the upper part of the pressure rod 82, and one end of the reset button 822 extends out of the housing 1. The user can control the movement of the pressure rod 82 by pressing the reset button 822, thereby restoring the locking coil assembly 8 to its initial state.

[0036] The locking coil assembly 8 is located on the right side of the mounting base 2, and a buckle 21 is provided on the left side of the mounting base 2. The current transformer 7 has a slot 71 that cooperates with the buckle 21. The current transformer 7 is installed on the left side of the mounting base 2, so that the current transformer 7 is positioned close to the power supply end. In one embodiment, the buckle 21 is an elastic buckle, which cooperates with the slot 71 through elastic deformation, thereby realizing the installation and fixation of the current transformer 7.

[0037] The right side of the mounting base 2 is connected to a contact plate seat 22, which has two vertically arranged mounting grooves 221. One end of the movable contact 6 passes through the mounting groove 221 and is connected to the circuit board 4.

Claims

1. An electrical leakage protection plug comprising: The utility model provides a test button, the utility model relates to a test button, including the shell (1), be equipped with the mounting seat (2) in the shell (1), be equipped with the pin assembly (3) of one end through the shell (1) arrangement on the mounting seat (2), the upper portion of mounting seat (2) is connected with the circuit board (4) with test circuit and / or self -checking circuit, the both sides of mounting seat (2) are equipped with a pair of static contact (5) and with static contact (5) corresponding a pair of dynamic contact (6), still be equipped with mutual -inductor (7) on the mounting seat (2) and the lock catch coil assembly (8) that can separate dynamic contact (6) with static contact (5) after mutual -inductor (7) detects electric leakage, the one end of static contact (5) is electrically connected with pin assembly (3), and the other end of static contact (5) is set through mutual -inductor (7) and is connected with circuit board (4), so that test circuit and / or self -checking circuit can form closed loop through static contact (5).

2. The plug of claim 1, wherein, The pin assembly (3) includes a first pin (31) and a second pin (32), one end of the first pin (31) and the second pin (32) extends to the circuit board (4) and is electrically connected with the corresponding static contact (5).

3. The plug of claim 1, wherein, The shell (1) is connected with a test button (9) capable of moving in the vertical direction, the circuit board (4) has a test circuit, one end of the test button (9) extends out of the shell (1) and is electrically connected with the circuit board (4) when moving downward to turn on the test circuit.

4. The plug of claim 1, wherein, The lock catch coil assembly (8) includes a lock catch coil (81) electrically connected with the circuit board (4) and a pressure rod (82) capable of moving up and down, the lock catch coil (81) is provided with an iron core (83) capable of moving left and right, the iron core (83) is connected with a buckle plate assembly (84) capable of moving up and down and moving upward to drive the dynamic contact (6) to move upward, the pressure rod (82) is provided with a supporting portion (821) capable of cooperating with the buckle plate assembly (84) to support the buckle plate assembly (84), the pressure rod (82) is connected with a first elastic member (85) driving the pressure rod (82) to move upward, the iron core (83) is connected with a second elastic member (86) driving the iron core (83) to move left, and the lock catch coil (81) is energized to drive the iron core (83) to move right to separate the buckle plate assembly (84) from the supporting portion (821).

5. The plug of claim 4, wherein the plug is configured to be plugged into a power outlet of a power strip. The buckle plate assembly (84) includes a buckle plate (841) and a cross arm (842) arranged at the lower part of the buckle plate (841), and the lower part of the dynamic contact (6) abuts against the upper part of the cross arm (842).

6. The plug of claim 4, wherein, The upper part of the pressure rod (82) is connected with a reset button (822), one end of the reset button (822) extends out of the shell (1).

7. The plug of claim 1, wherein, The lock catch coil assembly (8) is arranged on the right side of the mounting seat (2), the left side of the mounting seat (2) is provided with a buckle (21), and the mutual -inductor (7) is provided with a clamping groove (71) matched with the buckle (21).

8. The plug of claim 1, wherein, The right side of the mounting base (2) is connected with a contact base (22), two mounting slots (221) arranged along the vertical direction are formed on the contact base (22), and one end of the movable contact (6) passes through the mounting slot (221) and is connected with the circuit board (4).

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