Tripping reset device of leakage protection plug

Abstract

The utility model discloses a tripping reset device of a leakage protection plug, which comprises a shell, an electromagnetic mechanism and a circuit board, the electromagnetic mechanism and the circuit board are arranged in the shell, the circuit board is electrically connected with two groups of static contact pieces and moving contact pieces, static contacts are arranged at the lower ends of the static contact pieces, moving contacts aligned with the static contacts are arranged on the moving contact pieces, and a reset key is arranged at the top of the shell in a penetrating manner. The lower end of the reset key is provided with a traction rod penetrating through the circuit board, the traction rod between the reset key and the circuit board is sleeved with a first spring, a middle frame is arranged in the shell, a contact supporting piece is movably arranged in the middle frame, the two sides of the contact supporting piece are provided with supporting rods extending outwards, and the movable contact piece abuts against the upper ends of the supporting rods. The movable iron core and the traction rod are linked through a contact supporting piece, and the contact supporting piece can drive the movable contact piece to move so that the movable contact can make contact with or be separated from the static contact. According to the leakage protection plug, a locking plate in the prior art is omitted, the structure is simpler and more compact, the size of the leakage protection plug is smaller, and meanwhile the production cost is reduced.

Description

Technical Field

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

[0002] Many products are now equipped with leakage protection plugs. When an electrical device connected to a leakage protection plug experiences a leakage, the leakage protection plug can automatically cut off the power within tens of milliseconds, protecting users from the danger of electric shock and safeguarding their lives.

[0003] Most existing leakage current protection plugs have complex tripping and reset mechanisms. For example, Chinese utility model patent application number CN202223086434.7 discloses a leakage current protection plug, including a plug housing, a flexible moving contact, copper pins, a magnetic ring, a power cord, an electronic control board, and a tripping assembly. The electronic control board is fixed inside the plug housing, the first end of the flexible moving contact is welded to the electronic control board, the magnetic ring has a column, the magnetic ring is sleeved on the flexible moving contact, and is welded to the electronic control board through the column, with a gap between the magnetic ring and the electronic control board. The first end of the power cord passes through the gap and is soldered to the control board and the elastic moving contact. The second end of the power cord protrudes from the plug housing. The first end of the copper pin is fixed inside the plug housing and has a stationary contact. The second end of the copper pin protrudes from the plug housing and is exposed. The second end of the elastic moving contact has a moving contact that mates with the stationary contact. The second end of the elastic moving contact is located above the copper pin. The tripping assembly includes a reset frame, a reset rod, a locking plate, and a solenoid valve device. The tripping assembly of this leakage protection plug has a complex structure, which also makes the overall plug volume relatively large. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a tripping and reset device for a leakage current protection plug with a simpler and more compact structure.

[0005] Therefore, this utility model is implemented using the following technical solution:

[0006] A tripping and reset device for a leakage current protection plug includes a housing and an electromagnetic mechanism and a circuit board disposed within the housing. The circuit board is electrically connected to two sets of stationary contacts and moving contacts. The lower end of the stationary contacts is provided with a stationary contact, and the moving contacts are provided with a moving contact aligned with the stationary contact. A reset button is disposed on the top of the housing. The lower end of the reset button has a traction rod passing through the circuit board, and a first spring is sleeved on the traction rod between the reset button and the circuit board. The device is characterized in that: a middle frame is provided inside the housing, and a contact support member is movably disposed within the middle frame. Support rods extending outward are provided on both sides of the contact support member. The moving contact abuts against the upper end of the support rod. The electromagnetic mechanism includes a moving iron core. The moving iron core and the traction rod are linked through the contact support member. The contact support member can drive the moving contact to move so that the moving contact contacts contact or disengage from the stationary contact.

[0007] Furthermore, the traction rod has a first opening on both the left and right sides, the contact support has a locking block on the front that can be inserted into the first opening and a groove on the back, the locking block has an outwardly inclined surface, the moving iron core has a chuck that can move in the groove, and the groove has a second opening that allows the moving iron core to move up and down, the width of the second opening being smaller than the width of the chuck.

[0008] Furthermore, the middle frame is provided with a vertical opening for the movement of the support rod, and the middle frame is provided with a cavity for the electromagnetic mechanism to be inserted. The electromagnetic mechanism includes a skeleton, a coil wound on the skeleton and a stationary iron core, and a second spring is provided between the stationary iron core and the moving iron core.

[0009] Furthermore, multiple limiting buckles are provided on both sides of the middle frame, and the circuit board is inserted into the limiting buckles.

[0010] Furthermore, the housing includes an upper housing and a lower housing, which are detachably connected by a plurality of bolts.

[0011] After adopting the above technical solution, the moving iron core and the traction rod are linked through the contact support component. The contact support component can drive the moving contact piece to move so that the moving contact can contact or disengage from the stationary contact. This eliminates the locking piece in the existing technology, making the structure simpler and more compact, reducing the size of the leakage protection plug, and lowering the production cost. Attached Figure Description

[0012] The present invention includes the following figures:

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0014] Figure 2 This is a three-dimensional structural diagram of the housing of this utility model;

[0015] Figure 3 for Figure 2 A schematic diagram of the three-dimensional structure without the middle frame;

[0016] Figure 4 for Figure 2 Exploded view of the structure.

[0017] Reference numerals: 1. Housing; 2. Electromagnetic mechanism; 3. Circuit board; 4. Stationary contact piece; 5. Moving contact piece; 6. Stationary contact; 7. Moving contact; 8. Reset button; 9. Traction rod; 10. First spring; 11. Middle frame; 12. Contact support; 13. Support rod; 14. Moving iron core; 15. First opening; 16. Locking block; 17. Groove; 18. Inclined surface; 19. Chuck; 20. Second opening; 21. Vertical opening; 22. Cavity; 23. Frame; 24. Limiting buckle; 25. Upper housing; 26. Lower housing; 27. Bolt. Detailed Implementation

[0018] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0019] Referring to the above figures, the tripping and reset device of a leakage current protection plug provided by this utility model includes a housing 1 and an electromagnetic mechanism 2 and a circuit board 3 disposed within the housing 1. The circuit board 3 is electrically connected to two sets of stationary contacts 4 and moving contacts 5. The lower end of the stationary contact 4 is provided with a stationary contact 6, and the moving contact 5 is provided with a moving contact 7 aligned with the stationary contact 6. The moving contact 5 has elasticity that allows the moving contact 7 to disengage from the stationary contact 6. A reset button 8 is provided at the top of the housing 1, and the lower end of the reset button 8 has a pull rod 9 passing through the circuit board 3. A first spring 10 is sleeved on the traction rod 9 between the circuit board 3 and the housing 1. The housing 1 has a middle frame 11, within which a contact support 12 is movably mounted. Support rods 13 extending outwards are located on both sides of the contact support 12. The moving contact piece 5 abuts against the upper end of the support rod 13. The electromagnetic mechanism 2 includes a moving iron core 14, which is linked to the traction rod 9 via the contact support 12. The contact support 12 can drive the moving contact piece 5 to move, causing the moving contact 7 to contact or disengage from the stationary contact 6. The guide rod 9 has first openings 15 on both its left and right sides. The contact support member 12 has a locking block 16 on its front that can be inserted into the first opening 15 and a groove 17 on its back. The locking block 16 has an outwardly inclined surface 18. The moving iron core 14 has a chuck 19 that can move within the groove 17. The groove 17 has a second opening 20 to allow the moving iron core 14 to move up and down. The width of the second opening 20 is smaller than the width of the chuck 19. The middle frame 11 has a vertical opening 21 to allow the support rod 13 to move. The frame 11 is provided with a cavity 22 for accommodating the electromagnetic mechanism 2. The electromagnetic mechanism 2 includes a frame 23, a coil wound on the frame 23, and a stationary iron core. A second spring is provided between the stationary iron core and the moving iron core 14. Multiple limit buckles 24 are provided on both sides of the middle frame 11. The circuit board 3 is inserted into the limit buckle 24. The housing 1 includes an upper housing 25 and a lower housing 26. The upper housing 25 and the lower housing 26 are detachably connected by multiple bolts 27. The middle frame 11 is limited by the upper housing 25 and the lower housing 26 abutting against each other.

[0020] The working principle of this utility model is as follows:

[0021] When an electrical device connected to the leakage protection plug experiences a leakage fault, the electromagnetic mechanism 2 is energized, causing the moving iron core 14 to move inward and engage with the stationary iron core. The moving iron core 14 drives the contact 7 support to rotate clockwise, causing the locking block 16 to disengage from the first opening 15. The contact support 12 moves downward under its own weight and the elasticity of the moving contact piece 5, causing the moving contact 7 to disengage from the stationary contact 6, thus completing the power cut-off. After the fault is cleared, the electromagnetic mechanism 2 is de-energized, and the second spring pushes the moving iron core 14 outward, causing the contact support 12 to rotate counterclockwise. At the same time, pressing the reset button 8 activates the traction mechanism. The guide rod 9 moves downward, and the traction rod 9 applies pressure to the inclined plane 18, causing the contact support 12 to rotate slightly clockwise, preventing the locking block 16 and the lower end of the traction rod 9 from jamming. The locking block 16 can abut against the inner side of the traction rod 9, allowing the traction rod 9 to continue moving downward. Continue pressing the reset button 8 until the locking block 16 is inserted into the first opening 15, and then release the reset button 8. The reset button 8 and the contact support 12 move upward under the force of the first spring 10. The contact support 12 drives the moving contact piece 5 to bend upward, causing the moving contact 7 to abut against the stationary contact 6 and energize it.

[0022] In this embodiment, the locking plate in the prior art is omitted, making the structure simpler and more compact, reducing the size of the leakage protection plug and lowering production costs. The vertical opening 21 provides space for the support rod 13 to move up and down, while preventing the contact support 12 from swaying in other directions during its up and down movement, making the contact support 12 move more accurately. The circuit board 3 is inserted into the limiting buckles 24 on both sides of the middle frame 11 for fixation, resulting in higher structural stability.

[0023] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A trip reset device of an electric leakage protection plug, comprising a shell, an electromagnetic mechanism and a circuit board arranged in the shell, the circuit board being electrically connected with two groups of static contact pieces and dynamic contact pieces, the static contact pieces being provided with static contact heads at lower ends, the dynamic contact pieces being provided with dynamic contact heads aligned with the static contact heads, a reset key being arranged at a top of the shell, the reset key being provided with a traction rod penetrating through the circuit board at a lower end, and a first spring being arranged on the traction rod between the reset key and the circuit board. The shell is internally provided with a middle frame, the middle frame is movably provided with a contact support, the contact support is provided with outwardly extending support rods on both sides, the moving contact piece abuts on the upper end of the support rod, the electromagnetic mechanism comprises a moving iron core, the moving iron core and the traction rod are linked through the contact support, the contact support can drive the moving contact piece to move to make the moving contact piece contact or separate from the static contact.

2. The trip reset device for an electrical leakage protection plug according to claim 1, wherein: The traction rod is provided with a first opening on both left and right sides, the contact support is provided with a clamping block which can be clamped into the first opening on the front surface and is provided with a recess on the back surface, the clamping block has an outwardly inclined inclined surface, the moving iron core is provided with a chuck which can move in the recess, the recess is provided with a second opening which can accommodate the moving iron core to move up and down, and the width of the second opening is smaller than the width of the chuck.

3. The reset device for a plug-in electric leakage protector according to claim 1 or 2, characterized in that: The middle frame is provided with a vertical opening which can accommodate the movement of the support rod, and the middle frame is provided with a cavity which can accommodate the placement of the electromagnetic mechanism, the electromagnetic mechanism comprises a framework, a coil wound on the framework and a static iron core, and the static iron core and the moving iron core are provided with a second spring.

4. The tripping reset device for an electric leakage protection plug according to claim 3, characterized in that: The middle frame is provided with a plurality of limiting buckles on both sides, and the circuit board is inserted into the limiting buckles.

5. The reset device for a plug-in electric leakage protector according to claim 3, wherein: The shell comprises an upper shell and a lower shell, and the upper shell and the lower shell are detachably connected through a plurality of bolts.

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