Miniature electric leakage protection circuit breaker

Abstract

The utility model belongs to the field of circuit breakers, and particularly relates to a miniature electric leakage protection circuit breaker, which comprises a shell, an operating mechanism, an electromagnetic release, a static contact, a moving contact, a load wiring terminal, a power supply wiring terminal, an arc extinguish chamber and an electric leakage protection assembly. The electric leakage protection assembly comprises an electric leakage protection circuit board and a zero line mutual inductor which are arranged in the shell and correspond to the electromagnetic tripper, a plurality of supporting rods are arranged in the shell and correspond to the electromagnetic tripper, and clamping holes clamped with the supporting rods are formed in the electric leakage protection circuit board; the electric leakage protection circuit board is arranged at the position of the electromagnetic release, the electric leakage protection circuit board is prevented from occupying the space of the operating mechanism, the structure of the operating mechanism does not need to be adjusted, the universality of the operating mechanism is effectively improved, the electric leakage protection circuit board and the shell are assembled in a clamping fit mode, and the assembling efficiency is higher.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit breakers, and particularly relates to a small leakage protection circuit breaker. Background Art

[0002] A small leakage protection circuit breaker is an electrical protection device integrating overload, short - circuit and leakage protection functions. It is mainly used to detect the leakage or electric shock current in the power grid, and trigger a tripping action when a specific current value is detected, so as to cut off the power supply to protect the equipment and personal safety.

[0003] The deficiencies of the existing small leakage protection circuit breakers are as follows: Firstly, the internal structure layout is unreasonable. Since the internal space of the circuit breaker is relatively compact, the leakage protection circuit board occupies a large space inside the circuit breaker, so the structure of the operating mechanism of the circuit breaker also needs to be adjusted accordingly, resulting in an increase in production costs. Secondly, when the small circuit breaker is disconnected or tripped, the power supply of the leakage protection circuit board cannot be cut off. Users can only connect the power supply from one end of the product (i.e., the power supply end), and the other end (i.e., the load end) must be strictly connected to the load. If the user misconnects the wires (connects them in reverse), the leakage protection circuit board will be continuously energized when a fault occurs or the circuit breaker is disconnected, which is likely to cause the leakage protection circuit board to burn out. Summary of the Invention

[0004] The purpose of the utility model is to overcome the defects and deficiencies existing in the prior art, and provide a small leakage protection circuit breaker, which can solve the problem of unreasonable layout of the leakage protection circuit, and can effectively avoid the problem of burning out the leakage protection circuit board due to reverse wiring.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is as follows: A small leakage protection circuit breaker includes a housing, an operating mechanism, an electromagnetic release, a static contact, a moving contact, a load terminal, a power supply terminal, an arc extinguishing chamber, and a leakage protection component arranged inside the housing. The leakage protection component includes a leakage protection circuit board and a neutral line current transformer arranged inside the housing corresponding to the electromagnetic release. A plurality of support rods are respectively arranged inside the housing corresponding to the electromagnetic release, and card holes engaged with the plurality of support rods are respectively arranged on the leakage protection circuit board.

[0006] In some embodiments, it also includes a power-taking spring assembly, which includes an isolating piece rotatably disposed in a shell and cooperating with a moving contact frame of an operating mechanism, and a power-taking spring disposed on a leakage protection circuit board and cooperating with the isolating piece. When the moving contact frame rotates to a closed position, the isolating piece drives the contact arm of the power-taking spring to contact an L-pole conductive piece, thereby connecting the power supply of the leakage protection circuit board. When the moving contact frame rotates to an open position or is tripped and opened, the isolating piece drives the contact arm of the power-taking spring to separate from the L-pole conductive piece, thereby disconnecting the power supply of the leakage protection circuit board.

[0007] In some embodiments, the isolation member is provided with a positioning hole, the shell is provided with a sleeve portion inserted into the positioning hole, the power-taking spring is sleeved on the sleeve portion, the connecting arm of the power-taking spring is connected to the leakage protection circuit board, the contact arm of the power-taking spring is in contact with the lever portion of the isolation member, the lever portion moves with the isolation member and drives the contact arm to move, and constitutes a linkage cooperation between the contact arm and the lever portion.

[0008] In some embodiments, the tail of the contact arm has a bent contact portion that matches with the L-pole conductive member, and the L-pole conductive member is provided with a bent contact portion that matches with the bent contact arm.

[0009] In some embodiments, the isolating member has a driving inclined surface that matches the moving contact frame, and the moving contact frame has a driving block that matches the driving inclined surface. The driving block moves with the moving contact frame and slides back and forth on the driving inclined surface, forming a linkage cooperation between the isolating member and the driving block.

[0010] In some embodiments, a first partition and a second partition are respectively arranged between the arc extinguishing chamber and the load terminal in the shell, and a receiving groove matching the leakage protection circuit board is formed between the first partition and the second partition, and one end of the leakage protection circuit board is engaged in the receiving groove.

[0011] In some embodiments, an arc-guiding protrusion is provided in the shell corresponding to the position between the first partition and the arc-extinguishing chamber, an arc-guiding channel is formed between the arc-guiding protrusion and the first partition, an exhaust hole connected to the arc-guiding channel is provided on the shell, and the arc-guiding channel is connected between the exhaust hole and the arc-extinguishing chamber.

[0012] In some embodiments, the height of the first partition is greater than the height of the arc-guiding protrusion.

[0013] In some embodiments, a wire is provided on the coil of the electromagnetic release, and one end of the wire passes through the receiving slot and the neutral line transformer in sequence and is connected to the load terminal.

[0014] In some embodiments, a limiting step that cooperates with the leakage protection circuit board is provided inside the housing corresponding to the load terminal, and a limiting bump that is engaged inside the limiting step is provided on one side of the leakage protection circuit board.

[0015] The beneficial effects of the present utility model are as follows: The leakage protection circuit board is arranged at the electromagnetic release, avoiding the leakage protection circuit board occupying the space of the operating mechanism, without the need to adjust the structure of the operating mechanism, effectively improving the versatility of the operating mechanism, and the leakage protection circuit board and the housing are assembled by a snap-fit method, with higher assembly efficiency. The leakage protection circuit board is powered by a power-taking spring. When the operating mechanism of the circuit breaker is disconnected or tripped and disconnected, the moving contact holder drives the power-taking spring to separate from the L-pole conductive part through the isolating part, thereby realizing the disconnection of the power supply of the leakage protection circuit board. If the user miswires (wires are connected reversely), the leakage protection circuit board is in a power-off state when a fault occurs or is disconnected, avoiding the leakage protection circuit board from being burned out, and it is also more convenient for the user to wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, obtaining other drawings without creative efforts still belongs to the scope of the present utility model.

[0017] Figure 1 is a three-dimensional view of the internal structure of an embodiment of the present utility model;

[0018] Figure 2 is an exploded view of the internal structure of an embodiment of the present utility model;

[0019] Figure 3 is a front view of the internal structure of an embodiment of the present utility model;

[0020] Figure 4 is a three-dimensional view of the present utility model embodiment after removing the housing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer, the following further details the present utility model in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this utility model belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The terms "comprising" and "having" and any variations thereof in the specification and claims of this utility model and the above drawings are intended to cover non-exclusive inclusion.

[0023] The direction and position terms mentioned in this utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only with reference to the direction or position of the drawings. Therefore, the direction and position terms used are for the purpose of explaining and understanding this utility model and are not intended to limit the protection scope of this utility model.

[0024] The present utility model will be further described below in conjunction with the drawings and specific embodiments:

[0025] As Figure 1 、 2 、shown in 3, a small leakage protection circuit breaker includes a housing 10, an operating mechanism 11, an electromagnetic release 12, a static contact 13, a moving contact 14, a load terminal 15, a power supply terminal 16, an arc extinguishing chamber 17, and a leakage protection component 20 disposed in the housing 10. The leakage protection component 20 includes a leakage protection circuit board 21 and a neutral line current transformer 22 disposed in the housing 10 corresponding to the electromagnetic release 12. A plurality of support rods 1000 are respectively disposed in the housing 10 corresponding to the electromagnetic release 12. Card holes 211 engaged with the plurality of support rods 1000 are respectively disposed on the leakage protection circuit board 21. Disposing the leakage protection circuit board at the electromagnetic release avoids the leakage protection circuit board occupying the space of the operating mechanism, and there is no need to adjust the structure of the operating mechanism, effectively improving the versatility of the operating mechanism. Moreover, the leakage protection circuit board and the housing are assembled by a snap-fit manner, and the assembly efficiency is higher.

[0026] As Figure 2 and 4As shown, it also includes a power-taking spring assembly 200, which includes an isolating member 23 rotatably disposed in the housing 10 and cooperating with the moving contact frame 111 of the operating mechanism 11, and a power-taking spring 24 disposed on the leakage protection circuit board 21 and cooperating with the isolating member 23. When the moving contact frame 111 rotates to the closing position, the isolating member 23 drives the contact arm 241 of the power-taking spring 24 to contact the L-pole conductive member 25, thereby connecting the power supply of the leakage protection circuit board 21. When the moving contact frame 111 rotates to the opening position or is tripped and opened, the isolating member 23 drives the contact arm 241 of the power-taking spring 24 to separate from the L-pole conductive member 25, thereby disconnecting the power supply of the leakage protection circuit board 21. The leakage protection circuit board draws power through the power spring. When the operating mechanism of the circuit breaker is disconnected or tripped, the movable contact frame drives the power spring to separate from the L-pole conductive member through the isolation member, thereby realizing the power cutoff of the leakage protection circuit board. If the user makes a wrong connection (connects the connection in reverse), the leakage protection circuit board is in a power-off state when a fault occurs or disconnects, thereby avoiding the leakage protection circuit board from burning out and making it more convenient for the user to connect the wires. The isolation member 23 is provided with a positioning hole 231, and a sleeve portion 1001 inserted into the positioning hole 231 is provided in the housing 10. The power spring 24 is sleeved on the sleeve portion 1001, and the connecting arm 242 of the power spring 24 is connected to the leakage protection circuit board 21. The contact arm 241 of the power spring 24 abuts against the lever portion 232 of the isolation member 23. The lever portion 232 moves with the isolation member 23 and drives the contact arm 241 to move, and forms a linkage cooperation between the contact arm 241 and the lever portion 232. The tail of the contact arm 241 has a bent contact portion 2411 that matches the L-pole conductive member 25, and the L-pole conductive member 25 is provided with a bent contact portion 251 that matches the bent contact arm 2411. The contact arm contacts the bent contact portion of the L-pole conductive member through the bent contact portion, thereby ensuring that the contact arm and the L-pole conductive member are in reliable contact. The isolating member 23 has a driving inclined surface 233 that matches the moving contact frame 111, and the moving contact frame 111 has a driving block 112 that matches the driving inclined surface 233. The driving block 112 moves with the moving contact frame 111 and reciprocates on the driving inclined surface 233, and constitutes a linkage cooperation between the isolating member 23 and the driving block 112. The moving contact frame slides on the driving inclined surface of the isolating member through the driving block, thereby ensuring that the moving contact frame can reliably drive the isolating member to move.

[0027] like Figure 1 , 2, as shown in FIGS. 3, a first partition 101 and a second partition 102 are respectively arranged inside the housing 10 corresponding to the positions between the arc extinguishing chamber 17 and the load terminal 15. An accommodation groove 100 that cooperates with the leakage protection circuit board 21 is formed between the first partition 101 and the second partition 102. One end of the leakage protection circuit board 21 is snapped into the accommodation groove 100. One end of the leakage protection circuit board is snapped into the accommodation groove. The accommodation groove can separate the leakage protection circuit board from the arc extinguishing chamber, and can prevent the high-temperature gas in the arc extinguishing chamber from entering the accommodation groove and affecting the performance of the leakage protection circuit board. A guide arc rib 103 is arranged inside the housing 10 corresponding to the position between the first partition 101 and the arc extinguishing chamber 17. An arc guide channel 104 is formed between the guide arc rib 103 and the first partition 101. An exhaust hole 105 connected to the arc guide channel 104 is arranged on the housing 10. The arc guide channel 104 communicates between the exhaust hole 105 and the arc extinguishing chamber 17. The arc guide channel can quickly introduce the high-temperature gas in the arc extinguishing chamber to the exhaust hole, realizing the smooth discharge of the high-temperature gas and preventing the high-temperature gas from affecting the performance of the leakage protection circuit board. The height of the first partition 101 is greater than the height of the guide arc rib 103. The first partition can isolate the high-temperature gas in the arc guide channel and prevent the high-temperature gas from affecting the performance of the leakage protection circuit board.

[0028] As Figure 2 and 3 shown, a wire 18 is arranged on the coil 121 of the electromagnetic release 12. One end of the wire 18 sequentially passes through the accommodation groove 100, the neutral line current transformer 22 and is connected to the load terminal 15. The wire is arranged in the accommodation groove, making the wiring more beautiful and the assembly more convenient. A limiting step 106 that cooperates with the leakage protection circuit board 21 is arranged inside the housing 10 corresponding to the load terminal 15. A limiting protrusion 212 that is snapped into the limiting step 106 is arranged on one side of the leakage protection circuit board 21. The L-pole conductive part is sequentially connected to the load terminal through the coil of the electromagnetic release and the wire. The leakage protection circuit board is snapped onto the limiting step of the housing through the limiting protrusion, so as to ensure a more compact connection between the leakage protection circuit board and the housing.

[0029] The above is only one embodiment of the present invention and is not used to limit the protection scope of the present invention; the protection scope of the present invention is defined by the claims in the claims book, and all equivalent changes and modifications made according to the present invention are within the protection scope of the present invention patent.

Claims

1. A small leakage protection circuit breaker, comprising a housing, an operating mechanism arranged in the housing, an electromagnetic release, a static contact, a moving contact, a load terminal, a power terminal, an arc extinguishing chamber, and a leakage protection component, characterized in that: The leakage protection component includes a leakage protection circuit board and a neutral line mutual inductor arranged in a shell at positions corresponding to the electromagnetic release. Multiple support rods are respectively arranged in the shell at positions corresponding to the electromagnetic release, and the leakage protection circuit board is respectively provided with clamping holes engaged with the multiple support rods.

2. The small leakage protection circuit breaker according to claim 1 is characterized in that: It also includes a power-taking spring assembly, which includes an isolating piece rotatably disposed in the shell and cooperating with the moving contact frame of the operating mechanism, and a power-taking spring disposed on the leakage protection circuit board and cooperating with the isolating piece. When the moving contact frame rotates to the closing position, the isolating piece drives the contact arm of the power-taking spring to contact the L-pole conductive piece, thereby connecting the power supply of the leakage protection circuit board. When the moving contact frame rotates to the opening position or is tripped and opened, the isolating piece drives the contact arm of the power-taking spring to separate from the L-pole conductive piece, thereby disconnecting the power supply of the leakage protection circuit board.

3. The small leakage protection circuit breaker according to claim 2 is characterized in that: The isolating member is provided with a positioning hole, and the shell is provided with a sleeve portion inserted into the positioning hole. The power-taking spring is sleeved on the sleeve portion, and the connecting arm of the power-taking spring is connected to the leakage protection circuit board. The contact arm of the power-taking spring abuts against the lever portion of the isolating member, and the lever portion moves with the isolating member and drives the contact arm to move, and constitutes a linkage cooperation between the contact arm and the lever portion.

4. The small leakage protection circuit breaker according to claim 2 is characterized in that: The tail of the contact arm has a bent contact portion matched with the L-pole conductive member, and the L-pole conductive member is provided with a bent contact portion matched with the bent contact arm.

5. The small leakage protection circuit breaker according to claim 2 is characterized in that: The isolating member has a driving inclined surface matched with the moving contact frame, and the moving contact frame has a driving block matched with the driving inclined surface. The driving block moves with the moving contact frame and slides back and forth on the driving inclined surface, and forms a linkage match between the isolating member and the driving block.

6. The small leakage protection circuit breaker according to claim 1, characterized in that: A first partition and a second partition are respectively arranged between the arc extinguishing chamber and the load terminal in the shell, and a receiving groove matched with the leakage protection circuit board is formed between the first partition and the second partition, and one end of the leakage protection circuit board is clamped in the receiving groove.

7. The small leakage protection circuit breaker according to claim 6, characterized in that: An arc-guiding convex strip is arranged in the shell corresponding to the position between the first partition and the arc-extinguishing chamber, an arc-guiding channel is formed between the arc-guiding convex strip and the first partition, an exhaust hole connected to the arc-guiding channel is arranged on the shell, and the arc-guiding channel is connected between the exhaust hole and the arc-extinguishing chamber.

8. The small leakage protection circuit breaker according to claim 7, characterized in that: The height of the first partition is greater than the height of the arc-guiding convex strip.

9. The small leakage protection circuit breaker according to claim 1, characterized in that: A conducting wire is arranged on the coil of the electromagnetic release, and one end of the conducting wire passes through the containing slot and the neutral line mutual inductor in sequence and is connected to the load wiring terminal.

10. The small leakage protection circuit breaker according to claim 1, characterized in that: A limiting step matched with the leakage protection circuit board is arranged at a position corresponding to the load terminal in the shell, and a limiting protrusion engaged in the limiting step is arranged on one side of the leakage protection circuit board.

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