Miniature residual-current circuit breaker

Abstract

The utility model relates to the technical field of residual-current circuit breakers, in particular to a miniature residual-current circuit breaker. Comprising a shell, wire connecting buckles installed on the front side and the rear side of the left end of the shell, wire outlet buckles installed on the front side and the rear side of the right end of the shell, an action mechanism installed on the top of the front end of the shell, and an operation knob rotationally installed on the front side of the upper end of the shell and in linkage connection with the action mechanism. And the first electromagnetic release is arranged on the left side of the front end of the shell and is electrically connected with the wiring buckle. According to the utility model, an original tripping mechanism is scientifically and rationally improved, and the tripping mechanism is mainly composed of the second electromagnetic tripper, the transmission connecting rod and the PCB, so that the whole structure of the tripping mechanism is compact, the layout is regular, and the tripping motion is more stable and reliable; and the workload and difficulty of early-stage assembly processing and later-stage overhaul and maintenance of the residual-current circuit breaker are effectively reduced, so that the stability and reliability of actual work of the residual-current circuit breaker are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of leakage circuit breakers, in particular to a small leakage circuit breaker. Background Art

[0002] A leakage circuit breaker, also known as a residual current switch, is mainly used to protect against leakage faults in equipment and fatal electric shock. It has overload and short-circuit protection functions. It can be used to protect lines or motors from overload and short circuit. It can also be used as an infrequent switching starter for lines under normal circumstances.

[0003] like Figure 3 As shown, it is a rear view of the previous generation of leakage circuit breaker after the rear cover is disassembled. Its tripping mechanism is designed between the rear end of the shell and the rear cover. When the current is overloaded or the manual electrical test is performed, the tripping mechanism can be operated to drive the action mechanism in the shell to perform a tripping movement, thereby disconnecting the circuit. However, the tripping mechanism of this structure has the following shortcomings in the actual manufacturing and use process: the original tripping mechanism has many components, complex structure and a relatively messy layout in the shell, resulting in a large workload and difficulty in the early assembly and processing of the leakage circuit breaker and the later inspection and maintenance. At the same time, due to the large number of components, if a single component has a problem, it may cause the tripping mechanism as a whole to fail to operate normally, reducing the stability and reliability of the actual operation of the leakage circuit breaker.

[0004] In view of this, it is particularly important to design and manufacture a tripping mechanism with compact structure, stable operation, and easy early assembly and later overhaul and maintenance in the design, manufacture and use of leakage circuit breakers. Utility Model Content

[0005] The purpose of the utility model is to propose a small leakage circuit breaker to solve the problem that the traditional leakage circuit breaker has numerous tripping mechanism components, complex structure and a relatively messy layout in the shell, which leads to poor stability and reliability in actual operation of the leakage circuit breaker.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A small leakage circuit breaker comprises a shell, a connection wire buckle installed on the front and rear sides of the left end of the shell, an output wire buckle installed on the front and rear sides of the right end of the shell, an action mechanism installed on the top of the front end of the shell, an operating knob rotatably installed on the front side of the upper end of the shell and linked to the action mechanism, a first electromagnetic release installed on the left side of the front end of the shell and electrically connected to the connection wire buckle, an arc extinguishing mechanism installed inside the front end of the shell and located below the first electromagnetic release, an arc striking mechanism installed inside the front end of the shell and located on the right side of the arc extinguishing mechanism, a double metal fixed on the right end of the arc striking mechanism and electrically connected to the output wire buckle, a test button with a lower end extending to the inner side of the rear end of the shell is movably installed on the rear side of the upper end of the shell, and a tripping mechanism with a compact structure and stable operation is arranged on the inner side of the rear end of the shell between the test button and the action mechanism.

[0008] As a further description of the above technical solution:

[0009] The tripping mechanism includes a second electromagnetic release installed on the inner side of the rear end of the shell and directly below the test button, a tripping slide column movably installed in the middle of the second electromagnetic release, a transmission connecting rod rotatably installed on the inner side of the rear end of the shell and located between the rear end of the action mechanism and the upper end of the tripping slide column, and a PCB arranged on the inner side of the rear end of the shell and below the second electromagnetic release.

[0010] As a further description of the above technical solution:

[0011] The right end of the transmission connecting rod is equipped with a driving end that penetrates the shell forward and is connected to the action mechanism. The inside of the shell is provided with an arc hole on the outside of the driving end. The left end of the transmission connecting rod is equipped with a gripping end that is U-shaped and movably engaged with the release slide column.

[0012] As a further description of the above technical solution:

[0013] The PCB is electrically connected to the incoming wire buckle, the outgoing wire buckle and the second electromagnetic release through wires.

[0014] As a further description of the above technical solution:

[0015] A return torsion spring is installed at the rear end of the housing and between the housing and the transmission connecting rod.

[0016] As a further description of the above technical solution:

[0017] The shell is a three-petal structure, a front cover is installed at the front end of the shell, and a rear cover is installed at the rear end of the shell.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0019] In the utility model, the original tripping mechanism is scientifically and rationally improved. The tripping mechanism is mainly composed of three parts: a second electromagnetic tripper, a transmission connecting rod and a PCB. The transmission connecting rod is erected between the second electromagnetic tripper and the action mechanism, and the PCB is separately arranged below the second electromagnetic tripper. When the PCB outputs a control signal to the second electromagnetic tripper, the tripping slide column can slide downward in the second electromagnetic tripper. Under the action of the lever principle, the driving end of the transmission connecting rod will move upward in the arc hole, thereby driving the action mechanism to perform a tripping action. This structure can make the overall structure of the tripping mechanism compact and the layout regular, and the tripping movement is more stable and reliable, which effectively reduces the workload and difficulty of the early assembly and processing of the leakage circuit breaker and the later inspection and maintenance, thereby improving the stability and reliability of the actual operation of the leakage circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A three-dimensional disassembly schematic diagram of a small leakage circuit breaker proposed by the utility model;

[0021] Figure 2 It is a rear view schematic diagram of the housing after the rear cover of the utility model is removed;

[0022] Figure 3 It is a schematic diagram of the structure of the previous generation of leakage circuit breaker in the prior art.

[0023] Legend:

[0024] 1. Shell; 101. Front cover; 102. Rear cover; 103. Arc hole; 2. Wire connection buckle; 3. Wire output buckle; 4. Action mechanism; 401. Operating knob; 5. First electromagnetic release; 6. Arc extinguishing mechanism; 7. Arc striking mechanism; 8. Double metal; 9. Test button; 10. Second electromagnetic release; 1001. Release slide column; 11. Transmission connecting rod; 1101. Drive end; 1102. Grip end; 12. PCB; 13. Reset torsion spring. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1 and Figure 2The utility model provides a technical solution: a small leakage circuit breaker, comprising a shell 1, a connection wire buckle 2 installed on the front and rear sides of the left end of the shell 1, an outgoing wire buckle 3 installed on the front and rear sides of the right end of the shell 1, an action mechanism 4 installed on the top of the front end of the shell 1, an operating knob 401 rotatably installed on the front side of the upper end of the shell 1 and linked with the action mechanism 4, a first electromagnetic release 5 installed on the left side of the front end of the shell 1 and electrically connected to the connection wire buckle 2, an arc extinguishing mechanism 6 installed inside the front end of the shell 1 and located below the first electromagnetic release 5, an arc striking mechanism 7 installed inside the front end of the shell 1 and located on the right side of the arc extinguishing mechanism 6, a double metal 8 fixed on the right end of the arc striking mechanism 7 and electrically connected to the outgoing wire buckle 3, a test button 9 with a lower end extending to the inner side of the rear end of the shell 1 is movably installed on the rear side of the upper end of the shell 1, and a tripping mechanism with compact structure and stable operation is arranged between the test button 9 and the action mechanism 4 on the inner side of the rear end of the shell 1.

[0027] Specifically, Figure 1 and Figure 2 As shown, the tripping mechanism includes a second electromagnetic release 10 installed on the inner side of the rear end of the housing 1 and located directly below the test button 9, a tripping slide 1001 movably installed in the middle of the second electromagnetic release 10, a transmission connecting rod 11 rotatably installed on the inner side of the rear end of the housing 1 and located between the rear end of the action mechanism 4 and the upper end of the tripping slide 1001, and a PCB arranged on the inner side of the rear end of the housing 1 and below the second electromagnetic release 10. 12, wherein the right end of the transmission link 11 is provided with a driving end 1101 which penetrates the housing 1 forward and is in transmission connection with the action mechanism 4, and an arc hole 103 is provided inside the housing 1 on the outside of the driving end 1101, which can limit the angle range of rotation adjustment of the transmission link 11 in the housing 1, and prevent the occurrence of the problem of rotation deviation of the transmission link 11, and the left end of the transmission link 11 is provided with a gripping end 1102 which is in a U-shaped structure and is movably engaged with the tripping slide post 1001, and can be in a contact sliding state with the upper end of the tripping slide post 1001, and has a certain connection gap, so that the tripping slide post 1001 can be 1 is converted into the rotational movement of the transmission link 11. The rear end of the housing 1 is located between the housing 1 and the transmission link 11 and a reset torsion spring 13 is installed. Under normal conditions, the reset torsion spring 13 can make the transmission link 11 generate a torsion force in the direction of the test button 9, maintain the initial working posture of the transmission link 11, and make the upper end of the tripping slide post 1001 stably abut against the lower end of the test button 9. When the operator presses the test button 9, the transmission link 11 and the tripping slide post 1001 can be driven to move downward stably. After releasing the test button 9, the entire mechanism can be stably reset to the initial working state.

[0028] At the same time, PCB 12 establishes electrical connection with the incoming wire buckle 2, the outgoing wire buckle 3 and the second electromagnetic release 10 through wires. Various electronic components such as MCU, current transformer and resistor are integrated on PCB 12, which can monitor the current passing through the leakage circuit breaker. When the circuit is overloaded, MCU can send a control signal to the second electromagnetic release 10, thereby realizing the subsequent tripping movement of the leakage circuit breaker.

[0029] Specifically, Figure 1 As shown, the shell 1 is a three-petal structure, with a front cover 101 installed at the front end of the shell 1 and a rear cover 102 installed at the rear end of the shell 1. Compared with the original two-petal structure, this structure can divide the inner cavity of the shell 1 into two parts, realize the separate installation operation of the leakage circuit breaker components, avoid mutual interference of the internal components during operation, and make the internal structure of the leakage circuit breaker operate more safely and stably. At the same time, the setting of the front cover 101 and the rear cover 102 facilitates the early assembly and processing of the leakage circuit breaker and the later disassembly and maintenance operations.

[0030] Working principle: When in use, when the current is overloaded, the first electromagnetic release 5 and the second electromagnetic release 10 can both drive the action mechanism 4 to perform a tripping movement, thereby realizing the disconnection of the internal circuit of the leakage circuit breaker. Compared with the operation mode of the first electromagnetic release 5, when the second electromagnetic release 10 is in a non-working state, its tripping slide post 1001 is in the highest position in the second electromagnetic release 10, and the transmission connecting rod 11 is tilted toward the test button 9 as a whole. At this time, the driving end 1101 of the transmission connecting rod 11 is in contact with the lower end of the arc hole 103, and the driving end 1101 is in a state of not contacting the action mechanism 4; when the circuit current is overloaded, the PCB 12 can output a control signal to the second electromagnetic release 10, and the second electromagnetic release 10 can be powered on and work, and the tripping slide 1001 can quickly slide downward into the second electromagnetic release 10, and the tripping slide 1001 can convert the vertical movement into the rotational movement of the transmission connecting rod 11 in the gripping end 1102 on the transmission connecting rod 11. Under the action of the lever principle, the driving end 1101 on the transmission connecting rod 11 will move upward in the arc hole 103, contact and hit the trigger member of the action mechanism 4. Under the combined action of the first electromagnetic release 5 and the second electromagnetic release 10, the action mechanism 4 can quickly and stably realize the tripping action of the leakage circuit breaker and cut off the circuit.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A small leakage circuit breaker, comprising a housing (1), a connection wire clip (2) mounted on both sides of the left end of the housing (1), an output wire clip (3) mounted on both sides of the right end of the housing (1), an action mechanism (4) mounted on the top of the front end of the housing (1), an operating knob (401) rotatably mounted on the front side of the upper end of the housing (1) and linked to the action mechanism (4), a first electromagnetic release (5) mounted on the left side of the front end of the housing (1) and electrically connected to the connection wire clip (2), an arc extinguishing mechanism (6) mounted inside the front end of the housing (1) and located below the first electromagnetic release (5), an arc striking mechanism (7) mounted inside the front end of the housing (1) and located on the right side of the arc extinguishing mechanism (6), and a double metal (8) fixed on the right end of the arc striking mechanism (7) and electrically connected to the output wire clip (3), characterized in that: A test button (9) is movably mounted on the rear side of the upper end of the housing (1), the lower end of which extends to the inner side of the rear end of the housing (1); a tripping mechanism with a compact structure and stable operation is arranged on the inner side of the rear end of the housing (1) between the test button (9) and the action mechanism (4).

2. A small leakage circuit breaker according to claim 1, characterized in that: The release mechanism comprises a second electromagnetic release (10) mounted on the inner side of the rear end of the housing (1) and located directly below the test button (9), a release slide (1001) movably mounted in the middle of the second electromagnetic release (10), a transmission connecting rod (11) rotatably mounted on the inner side of the rear end of the housing (1) and located between the rear end of the action mechanism (4) and the upper end of the release slide (1001), and a PCB (12) arranged on the inner side of the rear end of the housing (1) and located below the second electromagnetic release (10).

3. A small leakage circuit breaker according to claim 2, characterized in that: The right end of the transmission connecting rod (11) is provided with a driving end (1101) which penetrates forward through the housing (1) and is transmission-connected to the action mechanism (4); an arc hole (103) is provided inside the housing (1) and is located outside the driving end (1101); the left end of the transmission connecting rod (11) is provided with a gripping end (1102) which is in the shape of a U-shaped structure and is movably engaged with the release sliding column (1001).

4. A small leakage circuit breaker according to claim 3, characterized in that: The PCB (12) establishes electrical connection with the incoming wire buckle (2), the outgoing wire buckle (3) and the second electromagnetic release (10) through electric wires.

5. A small leakage circuit breaker according to claim 2, characterized in that: A return torsion spring (13) is installed at the rear end of the housing (1) and between the housing (1) and the transmission connecting rod (11).

6. A small leakage circuit breaker according to claim 1, characterized in that: The shell (1) is a three-petal structure; a front cover (101) is installed at the front end of the shell (1), and a rear cover (102) is installed at the rear end of the shell (1).

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