Arc Fault Circuit Interrupters

Abstract

The present invention discloses an arc fault circuit breaker, wherein a middle shell seat is connected between a front shell cover and a rear shell cover, a first and a second wiring terminal are sequentially arranged on both sides of the middle shell seat, the output lines on the first and the second wiring terminals are both wound on a first mutual inductor, the first mutual inductor is electrically connected to a first control circuit board, the first control circuit board is electrically connected to a first coil assembly, a first trip assembly is arranged in an installation cavity, the first trip assembly is linked to a first handle, a first moving contact and a second moving contact are arranged on the first trip assembly, a first and a second static contact piece are cooperatively arranged on one side of the first and second moving contacts, the first moving contact and the static contact piece are located on one side of the middle shell seat, the second moving contact and the static contact piece are located on the other side of the middle shell seat, the first static contact piece is electrically connected to the second coil assembly and the third wiring terminal respectively, and the second static contact piece is electrically connected to the second coil assembly and the fourth wiring terminal respectively. The present invention can realize multiple safety electricity detections.

Description

Technical Field

[0001] The invention relates to circuit safety equipment, in particular to an arc fault circuit breaker. Background Art

[0002] A circuit breaker is a special device used to protect circuits and ensure the safety of electricity use. A detection mechanism is set inside the circuit breaker for short circuit, overload and other detections. In actual use, there is also the situation of excessive arc, which affects the normal detection and use of short circuit. However, the structure of circuit breakers with arc detection on the market is generally complicated, and it is inconvenient to produce and assemble. Summary of the invention

[0003] In view of the shortcomings of the background technology, the technical problem to be solved by the present invention is to provide a circuit breaker with a simple structure, reasonable design and multiple safety power detection functions.

[0004] To this end, the present invention is implemented by adopting the following scheme:

[0005] A circuit breaker, comprising a front shell cover and a rear shell cover, wherein the front shell cover and the rear shell cover enclose an installation cavity, wherein a middle shell seat is connected between the front shell cover and the rear shell cover, a first wiring terminal and a second wiring terminal are sequentially arranged on both sides of the middle shell seat, output wires on the first and second wiring terminals are both wound around a first mutual inductor, the first mutual inductor is electrically connected to a first control circuit board, the first control circuit board is electrically connected to a first coil assembly, a first trip assembly is arranged in the installation cavity, the first trip assembly is transmission-connected to a first handle, a torsion spring is connected to the first handle, and the first trip assembly A first moving contact electrically connected to the first terminal and a second moving contact electrically connected to the second terminal are arranged on the middle shell seat, a first static contact piece and a second static contact piece are cooperatively arranged on one side of the first and second moving contacts, the first moving contact and the first static contact piece are located on one side of the middle shell seat, the second moving contact and the second static contact piece are located on the other side of the middle shell seat, the first static contact piece is electrically connected to the second coil assembly and the third terminal respectively, the second static contact piece is electrically connected to the second coil assembly and the fourth terminal respectively, and the iron cores in the first coil assembly and the second coil assembly can push the first trip assembly to operate.

[0006] A first arc extinguishing chamber is arranged below the first moving contact, one end of the first static contact piece extends downward into the first arc extinguishing chamber, a second arc extinguishing chamber is arranged on one side of the second static contact piece, one end of the second static contact piece extends into the second arc extinguishing chamber, and the first arc extinguishing chamber and the second arc extinguishing chamber are located on both sides of the middle shell seat.

[0007] The first tripping assembly includes a first swing frame, the first handle is hinged to one end of the first transmission arm, the other end of the first transmission arm is hinged to the first swing frame, the first swing frame is rotatably arranged on the rear shell cover, the first moving contact is arranged on the first swing frame, a tripping piece is swingably arranged on the first swing frame, an extrusion portion is extendedly arranged on the tripping piece, the extrusion portion is located in a recessed portion on the first swing frame, the first swing frame is connected to the second swing frame via a connecting shaft, the second moving contact is arranged on the second swing frame, and a collision portion is arranged on the tripping piece to cooperate with the iron cores in the first coil assembly and the second coil assembly.

[0008] A second shell is provided on one side of the rear shell cover, a second handle is provided on the second shell, the second handle is linked with the first handle, a fifth terminal and a sixth terminal are provided at one end of the second shell, the third and fourth terminals are electrically connected to a second control circuit board provided in the second shell, a second mutual inductor is provided in the second control circuit board, the second control circuit board is connected to the third coil assembly, a torsion spring is connected to the second handle, the second handle is hinged to one end of the second transmission arm, the other end of the second transmission arm is connected to the second tripping assembly, the iron core in the third coil assembly can drive the second tripping assembly and the second handle to move, and the third coil assembly is electrically connected to the fifth terminal and the sixth terminal on the second shell.

[0009] The second tripping assembly includes a rotating seat, on which a first rotating block and a second rotating block are swingably arranged, the other end of the second transmission arm is hinged to the first rotating block, the first rotating block can squeeze the second rotating block to move, the second rotating block is provided with an extension portion that can squeeze the rotating seat, and the iron core in the third coil assembly can push the second rotating block to move.

[0010] The second transformer is a current transformer.

[0011] The first mutual inductor is a zero-sequence mutual inductor.

[0012] A bimetallic strip is arranged in the rear cover shell and is electrically connected to the first and second wiring terminals. When the circuit breaker is closed, one end of the tripping member on the first tripping assembly hooks the bimetallic strip, and the tripping member can drive the first swing frame to move when it moves.

[0013] The first coil assembly includes a first coil, and the second coil assembly includes a second coil. The first coil and the second coil are wound on a first coil frame in a front-to-back manner, and an iron core is arranged in the first coil frame.

[0014] An insertion portion is provided at one end of the second handle extending outwardly, and a slot for inserting the insertion portion is provided on the first handle.

[0015] By adopting the above technical scheme, the advantages of the present invention are: 1. Simple structure, reasonable design, and capable of large-scale production; 2. Reasonable internal structure layout, capable of realizing leakage, overload, short circuit and arc detection together, thereby effectively realizing multiple safety detections of the circuit breaker and ensuring the safety of electricity use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention has the following accompanying drawings:

[0017] Figure 1 It is the appearance diagram of the present invention;

[0018] Figure 2 This is a diagram showing the internal structure of the first housing of the present invention;

[0019] Figure 3 for Figure 2 Internal structure diagram;

[0020] Figure 4 for Figure 3 A partial enlarged view of the area pointed by A in the middle;

[0021] Figure 5 is a structural diagram of a second trip assembly of the present invention;

[0022] Figure 6 for Figure 3 A view from another perspective;

[0023] Figure 7 It is a diagram showing the internal structure of the second shell of the present invention. DETAILED DESCRIPTION

[0024] As shown in the figure, the arc fault circuit breaker disclosed in the present invention includes a first housing 1 and a second housing 3 that are arranged in contact with each other. A first incoming terminal 2 is arranged at one end of the first housing 1, and a first outgoing terminal 13 is arranged at the other end. The first incoming terminal 2 and the first outgoing terminal 13 are connected through a detection component, and the detection component is transmission-connected to a first handle 8 arranged on the first housing 1. An incoming slot 4 is provided on the second housing 3. The first outgoing terminal 13 is connected to a wire. The wire passes through the incoming slot 4 and is electrically connected to a first control circuit board 31 arranged in the second housing 3. The first control circuit board 31 A first mutual inductor is arranged inside the second housing 3. In this embodiment, the first mutual inductor is a current mutual inductor. The first control circuit board 31 is electrically connected to the first coil assembly 32 in the second housing 3. The first coil assembly 32 is electrically connected to the second outlet terminal 28 on the second housing 3. A first trip assembly is arranged on one side of the first coil assembly 32. The first trip assembly is transmission-connected to the second handle 7 arranged on the second housing 3. The second handle 7 is linked to the first handle 8. Specifically, an insertion portion 27 is extended outwardly at one end of the second handle 7. A slot 29 for inserting the insertion portion 27 is provided on the first handle 8. The action of the iron core in the first coil assembly 32 can drive the action of the first trip assembly to drive the second handle 7 to rotate. Specifically, the first trip assembly includes a rotating seat 35, on which a first rotating block 36 and a second rotating block 33 are swingably arranged, one end of the second handle 7 is hinged to one end of the second transmission arm 37, the other end of the second transmission arm 37 is hinged to the first rotating block 36, the first rotating block 36 can squeeze the second rotating block 33 to move, the second rotating block 33 is provided with an extension 34 that can squeeze the rotating seat 35, and the iron core in the first coil assembly 32 can push the second rotating block 33 to move. Further, the first incoming terminal 2, the first outgoing terminal 13 and the second outgoing terminal 28 are each provided with two on the left and right, the detection assembly includes a second trip assembly and a second mutual inductor 9, the output line on the first incoming terminal 2 is wound around the second mutual inductor 9, in this embodiment, the second mutual inductor 9 is a zero-sequence mutual inductor, the second mutual inductor 9 is electrically connected to the second control circuit board 12 arranged in the first housing 1, the second control circuit board 12 is electrically connected to the second coil assembly 14, the second trip assembly is transmission-connected to the first handle 8, and the first handle 8 is connected with a torsion spring The second trip assembly is provided with a first moving contact 19 and a second moving contact 23 which are electrically connected to the corresponding first incoming terminals 2 respectively. A first static contact piece 11 and a second static contact piece 21 are cooperatively provided on one side of the first and second moving contacts. The first static contact piece 11 is electrically connected to the third coil assembly 16 and one of the first outgoing terminals 13 respectively, and the second static contact piece 21 is electrically connected to the third coil assembly 16 and the other first outgoing terminal 13 respectively. The iron cores in the second coil assembly 14 and the third coil assembly 16 can drive the second trip assembly to operate.Specifically, the second tripping assembly includes a first swing frame 18, a first handle 8 is hinged to one end of a first transmission arm 26, the other end of the first transmission arm 26 is hinged to the first swing frame 18, the first swing frame 18 is rotatably arranged in the first housing 1, the first moving contact 19 is arranged on the first swing frame 18, a tripping member 24 is swingably arranged on the first swing frame 18, an extrusion portion 38 is extendedly arranged on the tripping member 24, the extrusion portion 38 is located in a recessed portion 39 on the first swing frame 18, the first swing frame 18 is connected to the second swing frame 25 via a connecting shaft, the second moving contact 23 is arranged on the second swing frame 25, and a collision portion 5 is provided on the tripping member 24 for cooperating with the iron core 17 in the first coil assembly and the second coil assembly. A first arc extinguishing chamber 10 is arranged below the first moving contact 19, one end of the first static contact piece 11 extends downward into the first arc extinguishing chamber 10, a second arc extinguishing chamber 22 is arranged on one side of the second static contact piece 21, one end of the second static contact piece 21 extends into the second arc extinguishing chamber 22, by respectively arranging the first and second arc extinguishing chambers, the arc generated when the first and second moving and static contacts are disconnected can be effectively extinguished. A bimetallic strip 20 is arranged in the first housing 1, and the bimetallic strip 20 is electrically connected to the first incoming terminal, the first static contact piece and the second static contact piece. When the circuit breaker is closed, one end of the tripping member 24 on the first tripping assembly hooks the bimetallic strip 20, and the tripping member 24 can drive the first swing frame 18 to move when it moves. The second coil assembly 14 includes a second coil, and the third coil assembly 16 includes a third coil. The second coil and the third coil are wound on the first coil frame 15 in a front-to-back manner, and the first coil frame 15 is provided with an iron core 17.

[0025] The working principle of the present invention is: the live wire and the neutral wire are connected to the circuit breaker through the corresponding first incoming terminal 2, and the first and second handles are pulled to drive the first and second moving contacts to contact the first and second static contacts to realize the connection of the internal circuit of the circuit breaker. Since the connected wires on the first incoming terminal 2 are bypassed by the second mutual inductor 9, when leakage occurs, the second mutual inductor 9 will detect the leakage signal and feed it back to the second control circuit board 12. The second control circuit board 12 controls the second coil 14 to pass a sufficiently large current, drive the iron core 17 to move, push the release member 24 to move, and drive the first and second swing frames to move, so that the first and second moving contacts are separated from the first and second static contacts, so as to realize the leakage detection and disconnection of the circuit; when the current passed is overloaded, the bimetallic strip 20 will deform due to the high temperature, and then drive the release member 24 to move, which can also drive the first and second moving contacts to separate from the first and second static contacts, so as to realize the leakage detection and disconnection of the circuit. overload detection and disconnection of the circuit; when a short circuit occurs in the circuit, the current passed into the second coil 16 increases instantly, thereby driving the iron core 17 to move, pushing the tripping member 24 to move, and driving the first and second moving contacts to separate from the first and second static contacts, thereby realizing short circuit detection and disconnection of the circuit; when the arc is too large during the operation of the circuit breaker, the current in the circuit will increase. At this time, the first mutual inductor on the first control circuit board 31 will detect the change in current, and then control a sufficiently large current to pass into the first coil assembly 32, thereby driving the iron core in the first coil assembly 32 to move, pushing the second rotating block 33 to swing, and driving the rotating seat 35 and the first rotating block 36 to swing, thereby driving the second transmission arm 37 to swing, and finally driving the second handle 7 and the first handle 8 to swing to the disconnection angle, driving the first tripping assembly to move, so that the first and second moving contacts are separated from the first and second static contacts, thereby realizing arc fault detection and disconnection inside the circuit breaker.

[0026] The circuit breaker of the present invention has a reasonable internal structure layout, is easy to produce and assemble, and can simultaneously realize leakage, overload, short circuit and arc detection, thereby effectively realizing multiple safety detections of the circuit breaker and ensuring the safety of electricity use.

Claims

1. Arc fault circuit breaker, characterized by The utility model comprises a first shell and a second shell which are arranged in close contact with each other, wherein a first incoming terminal is arranged at one end of the first shell, and a first outgoing terminal is arranged at the other end, the first incoming terminal and the first outgoing terminal are connected via a detection component, the detection component is transmission-connected to a first handle arranged on the first shell, a line-in slot is provided on the second shell, a wire is connected to the first outgoing terminal, the wire passes through the line-in slot and is electrically connected to a first control circuit board arranged in the second shell, a first mutual inductor is arranged in the first control circuit board, the first control circuit board is electrically connected to a first coil assembly in the second shell, the first coil assembly is electrically connected to a second outgoing terminal on the second shell, a first tripping assembly is arranged on one side of the first coil assembly, the first tripping assembly is transmission-connected to a second handle arranged on the second shell, the second handle is linked to the first handle, and the action of the iron core in the first coil assembly can drive the action of the first tripping assembly to drive the second handle to rotate.

2. The arc fault circuit breaker according to claim 1, characterized in that The first incoming terminal, the first outgoing terminal and the second outgoing terminal are each provided with two on the left and right sides, the detection component includes a second tripping component and a second mutual inductor, the output line on the first incoming terminal is wound around the second mutual inductor, the second mutual inductor is electrically connected to a second control circuit board arranged in the first shell, the second control circuit board is electrically connected to the second coil component, the second tripping component is transmission-connected to the first handle, the first handle is connected to a torsion spring, the second tripping component is provided with a first moving contact and a second moving contact electrically connected to the corresponding first incoming terminals respectively, a first static contact piece and a second static contact piece are cooperatively provided on one side of the first and second moving contacts, the first static contact piece is electrically connected to the third coil component and one of the first outgoing terminals respectively, the second static contact piece is electrically connected to the third coil component and the other first outgoing terminal respectively, and the iron core in the second coil component and the third coil component can push the second tripping component to move.

3. The arc fault circuit breaker according to claim 2, characterized in that A first arc extinguishing chamber is arranged below the first moving contact, one end of the first stationary contact piece extends downward into the first arc extinguishing chamber, a second arc extinguishing chamber is arranged on one side of the second stationary contact piece, and one end of the second stationary contact piece extends into the second arc extinguishing chamber.

4. The arc fault circuit breaker according to claim 1, characterized in that The first tripping assembly includes a rotating seat, on which a first rotating block and a second rotating block are swingably arranged, a second handle is hinged to one end of a second transmission arm, and the other end of the second transmission arm is hinged to the first rotating block, the first rotating block can squeeze the second rotating block to move, the second rotating block is provided with an extension portion that can squeeze the rotating seat, and the iron core in the first coil assembly can push the second rotating block to move.

5. The arc fault circuit breaker according to claim 2, characterized in that The second tripping assembly includes a first swing frame, the first handle is hinged to one end of the first transmission arm, the other end of the first transmission arm is hinged to the first swing frame, the first swing frame is rotatably arranged in the first shell, the first moving contact is arranged on the first swing frame, a tripping piece is swingably arranged on the first swing frame, an extrusion portion is extendedly arranged on the tripping piece, the extrusion portion is located in a recessed portion on the first swing frame, the first swing frame is connected to the second swing frame through a connecting shaft, the second moving contact is arranged on the second swing frame, and a collision portion is arranged on the tripping piece to cooperate with the iron cores in the first coil assembly and the second coil assembly.

6. The arc fault circuit breaker according to claim 1, characterized in that The first transformer is a current transformer.

7. The arc fault circuit breaker according to claim 2, characterized in that The second transformer is a zero-sequence transformer.

8. The arc fault circuit breaker according to claim 2, characterized in that A bimetallic strip is arranged in the first housing and is electrically connected to the first incoming terminal, the first static contact piece and the third static contact piece. When the circuit breaker is closed, one end of the tripping piece on the second tripping assembly hooks the bimetallic strip.

9. The arc fault circuit breaker according to claim 2, characterized in that The second coil assembly includes a second coil, the third coil assembly includes a third coil, the second coil and the third coil are wound on a first coil frame in a front-to-back manner, and an iron core is arranged in the first coil frame.

10. The arc fault circuit breaker according to claim 1, characterized in that An insertion portion is provided at one end of the second handle extending outwardly, and a slot for inserting the insertion portion is provided on the first handle.

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