An electric leakage protection device

Abstract

The utility model discloses a kind of leakage protection devices, including shell, shell is equipped with mounting seat, circuit board is equipped on mounting seat, fixed conducting piece, movable conducting piece and cross arm, traction assembly that can pull cross arm rotation is further equipped on mounting seat, pull rod assembly is further slidably connected on mounting seat, traction assembly includes armature and trip coil, discard the spring structure for armature reset in traditional leakage protection device, change by the elastic restoring force of movable conducting piece drive cross arm rotation, further and pull rod assembly trip out. Thus, the reset spring and related assembly structure are saved, the number of parts is reduced, the overall structure is simplified, which is beneficial to the lightweight, miniaturization and cost control of the product. Since the reset spring is reduced, the pre-tightening force adjustment and position calibration of some parts during assembly are reduced, the assembly difficulty is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of leakage current protection technology, and in particular to a leakage current protection device. Background Technology

[0002] Residual current devices (RCDs) are important electrical safety equipment widely used in household, industrial, and commercial electrical systems. They are used to quickly cut off the power supply in the event of a leakage fault to prevent electric shock accidents and electrical fires.

[0003] In existing technology, when the circuit is normal and there is no leakage, the trip coil is energized, generating a magnetic force that attracts the armature. The armature applies a continuous traction force to the crossarm, keeping the moving and stationary conductive plates in a closed state. When the circuit board detects a leakage signal, it controls the trip coil to be de-energized, the magnetic force disappears, and the armature rebounds under the action of the reset spring, releasing the traction on the crossarm. At this time, under the elastic restoring force of the moving conductive plate itself or the action of other mechanical reset mechanisms, the crossarm rotates or moves, causing the moving conductive plate to separate from the stationary conductive plate, thus achieving automatic tripping.

[0004] However, the existing technology generally uses springs as the armature reset element, which has the following drawbacks: First, the additional reset spring increases the number of parts and assembly complexity, which is not conducive to product miniaturization and cost control; second, the spring may experience fatigue, deformation or failure after long-term operation, affecting the reliability and response speed of the trip.

[0005] Therefore, how to simplify the structure, reduce the number of parts, and improve product reliability and assembly efficiency while ensuring reliable tripping action and rapid response has become a technical problem that urgently needs to be solved by those skilled in the art.

[0006] This utility model is based on the above-mentioned circumstances. Utility Model Content

[0007] This invention overcomes the shortcomings of the prior art and provides a leakage current protection device with reliable tripping action, rapid response, simplified structure and high assembly efficiency.

[0008] This utility model is achieved through the following technical solution:

[0009] A leakage current protection device includes a housing, within which a mounting base is provided. The mounting base has a circuit board, a fixed conductive sheet, a flexible movable conductive sheet, and a crossarm capable of moving the movable conductive sheet. The fixed conductive sheet has pins electrically connected to the circuit board. The mounting base also has a first guide groove for guiding the vertical movement of the crossarm and a first receiving cavity communicating with the first guide groove and providing space for the crossarm to rotate back and forth. The mounting base also has a traction assembly capable of pulling the crossarm to rotate. A pull rod assembly is slidably connected to the mounting base and can engage with the rotated crossarm to pull the crossarm upward, connecting the movable conductive sheet and the fixed conductive sheet. The traction assembly includes an armature capable of pulling the crossarm to rotate, and also includes a trip coil that attracts the armature when energized, thereby keeping the movable conductive sheet connected to the fixed conductive sheet. When the circuit board detects leakage current, it de-energizes and releases the armature, causing the movable conductive sheet to recover from its elastic deformation and thus push the crossarm to rotate and disengage from the pull rod assembly.

[0010] As described above, in a leakage current protection device, the crossarm includes a connecting part, and the left and right sides of the connecting part are provided with support rods for driving the deformation of the conductive sheet. The rear side of the connecting part is provided with a connecting plate, and the connecting plate is provided with a slot that penetrates the connecting plate and is open at the bottom. The front side of the armature passes through the slot and the front end is provided with a limiting block to restrict the armature from exiting the slot. The connecting part and the connecting plate are an integral structure.

[0011] As described above, in a leakage current protection device, a first locking block is provided on the rear side of the connecting part, the pull rod assembly includes a pull column, an elastic element that can push the pull column upward is provided between the pull column and the mounting base, a second locking block that can engage with the first locking block is provided on the pull column, and an inclined surface that can push the connecting part is provided at the upper end of the first locking block and / or the lower end of the second locking block.

[0012] As described above, in a leakage current protection device, the pull column is provided with a sliding groove that runs through the pull column from front to back and is open at the bottom, and a transition connecting block that passes through the sliding groove is provided between the connecting part and the connecting plate.

[0013] As described above, the leakage current protection device further includes a current transformer electrically connected to the circuit board, and the rear end of the moving conductive sheet passes through the current transformer and is connected to the load.

[0014] As described above, the leakage current protection device has a leakage current detection circuit and a test circuit on the circuit board, a reset button for pressing the pull column on the housing, and a test button for the test circuit on the housing.

[0015] As described above, the leakage current protection device further includes an electrolytic capacitor electrically connected to the circuit board inside the housing.

[0016] As described above, in a leakage current protection device, the mounting base or circuit board is provided with a mounting bracket for mounting electrolytic capacitors.

[0017] As described above, in a leakage current protection device, a snap-fit ​​structure is provided between the mounting bracket and the circuit board to allow the mounting bracket to be fastened onto the circuit board.

[0018] As described above, in a leakage current protection device, an indicator light is slidably connected to the mounting bracket, and the indicator light is provided with an auxiliary block that extends above the crossarm, thereby assisting the crossarm to rotate backward when it is tripped.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] This invention eliminates the spring structure used for armature reset in traditional leakage current protection devices. Instead, the elastic restoring force of the moving conductive plate drives the crossarm to rotate, thereby disengaging it from the pull rod assembly. This eliminates the need for a reset spring and related assembly structures, reducing the number of parts, simplifying the overall structure, and facilitating product lightweighting, miniaturization, and cost control. Furthermore, the elimination of the reset spring reduces the need for preload adjustment and position calibration of some components during assembly, lowering assembly difficulty and improving production efficiency.

[0021] The mounting base is provided with a first guide groove and a first receiving cavity, which guide the up and down movement of the crossarm and provide space for its front and back rotation, ensuring that the movement path of the crossarm under the action of the traction assembly and the tie rod assembly is stable and accurate, thereby improving the stability and consistency of contact closure and opening. Attached Figure Description

[0022] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a cross-sectional schematic diagram of the present invention;

[0025] Figure 3 This is an exploded view of the present invention;

[0026] Figure 4 This is an exploded view of the present invention after the shell has been removed;

[0027] Figure 5 This is a schematic diagram of the structure of the tie rod assembly, crossarm, and armature connection in this utility model;

[0028] Figure 6 This is a schematic diagram of the crossbeam rotation structure in this utility model;

[0029] Figure 7 This is a schematic diagram of the crossbeam structure in this utility model;

[0030] Figure 8 This is a schematic diagram of the tie column in this utility model. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings:

[0032] like Figures 1 to 8 The leakage current protection device shown includes a housing 1, within which a mounting base 2 is provided. The mounting base 2 is provided with a circuit board 3, a fixed conductive sheet 4, a flexible movable conductive sheet 5, and a crossarm 6 capable of moving the movable conductive sheet 5. The fixed conductive sheet 4 has pins 41 electrically connected to the circuit board 3. The mounting base 2 also has a first guide groove 21 for guiding the vertical movement of the crossarm 6 and a first receiving cavity 22 communicating with the first guide groove 21 and providing space for the crossarm 6 to rotate back and forth. The mounting base 2 also has a mechanism for pulling the crossarm. The traction assembly 6 has a rotating crossarm 6. A pull rod assembly 7 is slidably connected to the mounting base 2, capable of engaging with the rotated crossarm 6 to pull it upwards, connecting the moving conductive plate 5 to the fixed conductive plate 4. The traction assembly includes an armature 81 that pulls the crossarm 6 to rotate. It also includes a trip coil 82 that, when energized, attracts the armature 81, keeping the moving conductive plate 5 connected to the fixed conductive plate 4. When the circuit board 3 detects leakage, it de-energizes and releases the armature 81, causing the moving conductive plate 5 to recover from its elastic deformation and thus push the crossarm 6 to rotate, disengaging from the pull rod assembly 7. The leakage protection device also includes a current transformer 91 electrically connected to the circuit board 3. The rear end of the moving conductive plate 5 passes through the current transformer 91 and is connected to the load. The circuit board 3 is equipped with a leakage detection circuit and a test circuit.

[0033] This invention eliminates the spring structure used for resetting the armature 81 in traditional leakage protection devices. Instead, the elastic restoring force of the moving conductive sheet 5 drives the crossarm 6 to rotate, thereby disengaging it from the pull rod assembly 7. This eliminates the need for a reset spring and related assembly structures, reducing the number of parts, simplifying the overall structure, and facilitating product lightweighting, miniaturization, and cost control. Reducing the reset spring also simplifies assembly by minimizing preload adjustment and position calibration of components, lowering assembly difficulty, and improving production efficiency. The mounting base 2 has a first guide groove 21 and a first receiving cavity 22, which guide the vertical movement of the crossarm 6 and provide space for its forward and backward rotation, ensuring a stable and accurate movement path of the crossarm 6 under the action of the traction assembly and the pull rod assembly 7, thereby improving the stability and consistency of contact closure and opening.

[0034] Furthermore, the mounting base 2 is also provided with a second receiving cavity 220 for mounting the trip coil 82. The second receiving cavity 220 is connected to the first receiving cavity 22, so that the armature 81 can be smoothly inserted into the first receiving cavity 22 and connected to the crossarm 6. The trip coil 82 is electrically connected to the circuit board 3.

[0035] In one embodiment, the crossarm 6 includes a connecting portion 61. The connecting portion 61 has support rods 62 on its left and right sides for deforming the conductive sheet 5. A connecting plate 63 is provided on the rear side of the connecting portion 61. The connecting plate 63 has a slot 631 that penetrates the connecting plate 63 and is open at the bottom. The front side of the armature 81 passes through the slot 631, and a limiting block 811 is provided at its front end to restrict the armature 81 from exiting the slot 631. The connecting portion 61 and the connecting plate 63 are an integral structure. Simultaneously, the armature 81 can slide up and down along the slot 631, so that the armature 81 does not affect the up and down movement of the crossarm 6.

[0036] The connecting part 61 and the connecting plate 63 are an integral structure, which avoids the problem of unstable movement caused by loose connection and assembly error in traditional split structure, improves the overall structural strength and movement accuracy of the crossarm 6, and ensures that its movement is reliable and consistent under the action of the traction component and the tie rod component 7.

[0037] Furthermore, a first locking block 611 is provided on the rear side of the connecting part 61. The pull rod assembly 7 includes a pull post 71. An elastic element 72 capable of pushing the pull post 71 upward is provided between the pull post 71 and the mounting base 2. A second locking block 711 capable of engaging with the first locking block 611 is provided on the pull post 71. The upper end of the first locking block 611 and / or the lower end of the second locking block 711 are provided with an inclined surface 712 capable of pushing the connecting part 61. The elastic element 72 can be an elastic rubber block or a spring, or other elastic elements.

[0038] When the trip coil 82 attracts the armature 81, it pulls the crossarm 6 to rotate towards the armature 81. Under the action of the elastic element 72, the pull column 71 drives the second locking block 711 upward to engage with the first locking block 611, thereby achieving stable driving of the crossarm 6 by the pull rod assembly 7. When the circuit board 3 detects a leakage signal, the trip coil 82 is de-energized, releasing the armature 81, causing the moving conductive piece 5 to recover from its elastic deformation and thus push the crossarm 6 to rotate and disengage from the pull rod assembly 7, achieving automatic disengagement with rapid response and reliable operation.

[0039] An inclined surface 712 is provided at the upper end of the first locking block 611 and / or the lower end of the second locking block 711, so that when the pull post 71 is pressed down, the locking blocks can slide against each other through the inclined surface 712 and smoothly enter the latching state.

[0040] Furthermore, the tie column 71 is provided with a groove 713 that runs through the tie column 71 from front to back and is open at the lower end. A transition connecting block 64 passing through the groove 713 is provided between the connecting part 61 and the connecting plate 63. The transition connecting block 64 can be directly installed or removed from below the groove 713 without completely disassembling the structure. The transition connecting block is integrally formed with the crossbeam 6, replacing the traditional screw fixing, simplifying the assembly process, reducing production costs, and improving maintenance efficiency. The design of the groove 713 passing through the tie column 71 saves lateral space, making the structure more compact.

[0041] A reset button 92 for pressing the pull column 71 is slidably connected on the housing 1, and a test circuit test button 93 is also provided on the housing 1.

[0042] The circuit board 3 is also equipped with a varistor 90 that can protect against overvoltage.

[0043] The principle of this device is as follows: When the load leaks current, the trip coil 82 is de-energized, releasing the armature 81, thereby restoring the movable conductive piece 5 from its elastic deformation and pushing the crossarm 6 to rotate away from the armature 81, thus disengaging from the pull post 71. When the load does not leak current, the trip coil 82 attracts the armature 81, thereby pulling the crossarm 6 to rotate towards the armature 81. Under the action of the elastic element 72, the pull post 71 drives the second locking block 711 upward to engage with the first locking block 611. Under the action of the pull post 71 and the armature 81, the crossarm 6 maintains the connection between the movable conductive piece 5 and the fixed conductive piece 4.

[0044] In one embodiment, the housing 1 is further provided with an electrolytic capacitor 94 electrically connected to the circuit board 3. The electrolytic capacitor 94 can buffer voltage fluctuations, enhance stability, filter high-frequency noise to improve anti-interference ability, and prevent malfunctions.

[0045] Furthermore, the mounting base 2 or the circuit board 3 is provided with a mounting bracket 95 for mounting the electrolytic capacitor 94. The mounting bracket 95 separates the electrolytic capacitor 94 from the circuit board 3, thereby preventing the electrolytic capacitor 94 from expanding and damaging the circuit board 3 after a period of use.

[0046] Furthermore, a latching structure 96 is provided between the mounting bracket 95 and the circuit board 3 to fasten the mounting bracket 95 onto the circuit board 3. This makes the installation of the mounting bracket 95 simpler and faster, improving installation efficiency. Furthermore, the mounting bracket 95 can secure the electrolytic capacitor 94 using latches or other fixing structures.

[0047] In one embodiment, an indicator light 97 is slidably connected to the mounting bracket 95. The indicator light 97 is provided with an auxiliary block 971 that extends above the crossarm 6, thereby assisting the crossarm 6 in rotating backward when it is tripped. When the trip coil 82 is de-energized and releases the armature 81, the auxiliary block 971 is provided with an abutting inclined surface that abuts against the upper part of the crossarm 6. The abutting inclined surface can apply a thrust to the crossarm 6, causing it to rotate backward.

[0048] In one embodiment, the housing 1 includes an upper housing and a lower housing, with a placement cavity between the upper housing and the lower housing for placing the mounting base 2, and the upper housing and the lower housing are connected and fixed by threaded fasteners.

Claims

1. A leakage current protection device, characterized in that: The device includes a housing (1), inside which is a mounting base (2). The mounting base (2) is provided with a circuit board (3), a fixed conductive sheet (4), a flexible movable conductive sheet (5), and a crossarm (6) that can drive the movable conductive sheet (5) to move. The fixed conductive sheet (4) is provided with pins (41) that are electrically connected to the circuit board (3). The mounting base (2) is also provided with a first guide groove (21) that guides the crossarm (6) to move up and down, and a first receiving cavity (22) that communicates with the first guide groove (21) and provides space for the crossarm (6) to rotate back and forth. The mounting base (2) is also provided with a mechanism that can pull the crossarm (6) to rotate. The traction assembly has a mounting base (2) which is slidably connected to a pull rod assembly (7) that can engage with the rotated crossarm (6) to pull the crossarm (6) upward and connect the moving conductive piece (5) to the fixed conductive piece (4). The traction assembly includes an armature (81) that can pull the crossarm (6) to rotate. The traction assembly also includes an armature (81) that attracts the armature (81) when energized, so that the moving conductive piece (5) and the fixed conductive piece (4) remain connected. When the circuit board (3) detects leakage, it de-energizes and releases the armature (81), so that the moving conductive piece (5) recovers from elastic deformation and pushes the crossarm (6) to rotate and disengage from the pull rod assembly (7).

2. The leakage current protection device according to claim 1, characterized in that: The crossarm (6) includes a connecting part (61). The left and right sides of the connecting part (61) are provided with support rods (62) for driving the conductive sheet (5) to deform. The rear side of the connecting part (61) is provided with a connecting plate (63). The connecting plate (63) is provided with a slot (631) that passes through the connecting plate (63) and is open at the bottom. The front side of the armature (81) passes through the slot (631) and the front end is provided with a limiting block (811) that restricts the armature (81) from exiting the slot (631). The connecting part (61) and the connecting plate (63) are an integral structure.

3. A leakage current protection device according to claim 2, characterized in that: The rear side of the connecting part (61) is provided with a first locking block (611), the pull rod assembly (7) includes a pull post (71), an elastic element (72) that can push the pull post (71) upward is provided between the pull post (71) and the mounting base (2), the pull post (71) is provided with a second locking block (711) that can be engaged with the first locking block (611), and the upper end of the first locking block (611) and / or the lower end of the second locking block (711) are provided with an inclined surface (712) that can push the connecting part (61).

4. A leakage current protection device according to claim 3, characterized in that: The pull column (71) is provided with a sliding groove (713) that runs through the pull column (71) from front to back and is open at the lower end. A transition connecting block (64) that passes through the sliding groove (713) is provided between the connecting part (61) and the connecting plate (63).

5. A leakage current protection device according to claim 4, characterized in that: The leakage protection device also includes a current transformer (91) electrically connected to the circuit board (3), and the rear end of the moving conductive sheet (5) passes through the current transformer (91) and is connected to the load.

6. A leakage current protection device according to claim 5, characterized in that: The circuit board (3) is provided with a leakage detection circuit and a test circuit. The housing (1) is provided with a reset button (92) for pressing the pull column (71). The housing (1) is also provided with a test circuit test button (93).

7. A leakage current protection device according to any one of claims 1-6, characterized in that: The housing (1) is also provided with an electrolytic capacitor (94) that is electrically connected to the circuit board (3).

8. A leakage current protection device according to claim 7, characterized in that: The mounting base (2) or circuit board (3) is provided with a mounting bracket (95) for mounting electrolytic capacitors (94).

9. A leakage current protection device according to claim 8, characterized in that: A latching structure (96) is provided between the mounting bracket (95) and the circuit board (3) to fasten the mounting bracket (95) onto the circuit board (3).

10. A leakage current protection device according to claim 9, characterized in that: An indicator light (97) is slidably connected to the mounting bracket (95). The indicator light (97) is provided with an auxiliary block (971) that can extend above the crossarm (6) so as to assist the crossarm (6) in rotating backward when the crossarm (6) is disengaged.

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