A small circuit breaker with automatic reclosing function

Abstract

The present invention relates to an automatic reclosing small circuit breaker, comprising a circuit breaker unit, an automatic reclosing device assembled with the circuit breaker unit, the circuit breaker unit comprising an N-line switch module, an L-line switch module, and a leakage protection metering module, the leakage protection metering module comprising a shell, a leakage protection metering component arranged in the shell, the leakage protection metering component comprising a leakage protection circuit board, two manganese copper steel conductive tubes, a zero sequence mutual inductor sleeved on the two manganese copper steel conductive tubes, two wiring terminals, two conductive sheets respectively connected between the two wiring terminals and the two manganese copper steel conductive tubes, one end of the two manganese copper steel conductive tubes is respectively electrically connected to the N-line switch module and the L-line switch module, and a wire is respectively connected between the two ends of the manganese copper steel conductive tube and the leakage protection circuit. The present invention has the advantages of simple structure, stable and reliable performance, small size, convenient assembly, and low cost.

Description

Technical Field

[0001] The invention relates to the technical field of circuit breakers, and in particular to an automatic reclosing miniature circuit breaker. Background Art

[0002] At present, miniature circuit breakers are widely used in low-voltage power distribution networks, mainly in various places such as industry, commerce, high-rise buildings and residential buildings. They can provide overcurrent protection and leakage protection for electrical equipment such as motors, distribution lines, and lighting circuits. The opening and closing actions of traditional miniature circuit breakers require manual operation. With the development of my country's smart grid, it is increasingly urgent to realize the intelligence of control electrical appliances under the premise of requiring safe operation of the power grid. In order to cope with new changes in the situation, the existing miniature circuit breakers should have an automatic reclosing function. The electric operating mechanism of the miniature circuit breaker is an accessory for long-distance electric opening and closing circuit breakers. It is directly used with the prepaid energy meter to realize reclosing after payment. The structural design of the existing automatic reclosing miniature circuit breaker is unreasonable, and modular assembly cannot be realized. The assembly is cumbersome, the production efficiency is low, and the cost is high. Therefore, the automatic reclosing miniature circuit breaker has the defects of complex structure, large size, unreliable performance, inconvenient assembly, and high cost. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a small automatic reclosing circuit breaker with simple structure, stable and reliable performance, small size, convenient assembly and low cost.

[0004] To achieve the above-mentioned purpose, the present invention adopts an automatic reclosing small circuit breaker, including a circuit breaker unit and an automatic reclosing device assembled with the circuit breaker unit, wherein the circuit breaker unit includes an N-line switch module arranged on one side of the automatic reclosing device, an L-line switch module arranged on one side of the N-line switch module, and a leakage protection metering module arranged on one side of the N-line switch module and the L-line switch module, wherein the leakage protection metering module includes a shell and a leakage protection metering component arranged in the shell, wherein the leakage protection metering component includes a leakage protection circuit board, two manganese-copper steel conductive tubes, a zero-sequence mutual inductor sleeved on the two manganese-copper steel conductive tubes, two wiring terminals, and two conductive sheets respectively connected between the two wiring terminals and the two manganese-copper steel conductive tubes, wherein one end of the two manganese-copper steel conductive tubes is electrically connected to the N-line switch module and the L-line switch module respectively, and a wire is respectively connected between the two ends of the manganese-copper steel conductive tube and the leakage protection circuit.

[0005] The beneficial effects of the above structure are: the automatic reclosing small circuit breaker adopts a modular structure design, and the circuit breaker unit is composed of an N-line switch module, an L-line switch module, and a leakage protection module. It can be flexibly assembled according to user needs, and the leakage protection module is mounted on the N-line switch module and the L-line switch module, which is more convenient to assemble, which is conducive to improving production efficiency, and can realize the leakage protection and metering functions of the automatic reclosing small circuit breaker. And the leakage protection module uses a manganese copper steel conductive tube to measure the current to achieve the purpose of metering, with a simple structural design and lower production cost. Therefore, the automatic reclosing small circuit breaker has the advantages of simple structure, stable and reliable performance, small size, convenient assembly, and low cost.

[0006] In particular, the two ends of the manganese copper steel conductive tube are respectively provided with a first wiring lug and a second wiring lug, one end of the two wires are respectively connected to the first wiring lug and the second wiring lug, and the other ends of the two wires are provided with a plug pin, which is plugged into the leakage protection circuit board. The manganese copper steel conductive tube is electrically connected to the leakage protection circuit board through the first wiring lug, the second wiring lug, the two wires, and the plug pin, so that the assembly is more convenient, and it is also conducive to improving the electrical connection reliability of the leakage protection leakage.

[0007] In particular, two screws are respectively arranged in the two manganese copper steel conductive tubes, and the two screws respectively pass through the conductive sheet, the second wiring nose, the manganese copper steel conductive tube, and the first wiring nose in sequence and are respectively connected to the N line switch module and the L line switch module. The use of screws to connect the N line switch module and the L line switch module in a horizontal through-type manner is conducive to improving the assembly efficiency of the automatic reclosing small circuit breaker.

[0008] In particular, a power-taking piece is provided in each of the two wiring terminals, and a plug pin is provided on one end of the power-taking piece, which is plugged into the leakage protection circuit board, and one end of the power-taking piece is inserted into the wiring terminal, and forms an electrical connection between the power-taking piece and the wiring terminal. Power-taking pieces are provided on each of the two wiring terminals, and the power-taking pieces can collect the voltage signals of the wiring terminals to the leakage protection circuit board, thereby realizing the voltage implementation monitoring function of the automatic reclosing miniature circuit breaker, and the power-taking piece and the leakage protection circuit board are connected by plugging, which is more convenient to assemble.

[0009] In particular, the zero-sequence transformer includes a transformer housing and a coil arranged in the transformer. The transformer housing is provided with two through holes for two manganese copper steel conductive tubes to pass through, and a partition is provided between the two conductive sheets on the transformer housing. The partition is provided between the two conductive sheets, and the partition can play an insulating and isolating role, and can increase the creepage distance between the two conductive sheets, which is beneficial to improving the safety performance of the automatic reclosing miniature circuit breaker.

[0010] In particular, a slot is provided on the transformer housing corresponding to the second wiring nose, one end of the second wiring nose is engaged in the slot, and a snap fit is formed between the second wiring nose and the transformer housing. The second wiring nose and the transformer housing are snap fit, so that the second wiring nose and the transformer housing are easily assembled, and the second wiring nose will not rotate at will, which can ensure that the connection between the second wiring nose and the transformer housing is more compact.

[0011] In particular, a limiting groove is provided on the transformer housing corresponding to the two conductive sheets, and the two conductive sheets are respectively engaged in the corresponding limiting grooves, and the transformer housing and the two conductive sheets are limited. The conductive sheets and the transformer housing are limited, so as to facilitate the assembly of the leakage protection metering component, which is beneficial to improve the assembly efficiency of the automatic reclosing small circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a stereogram of an embodiment of the present invention.

[0013] Figure 2 This is a diagram of the internal structure of an embodiment of the present invention.

[0014] Figure 3 This is an internal front view of the leakage protection metering module according to an embodiment of the present invention.

[0015] Figure 4 It is a three-dimensional diagram of a leakage protection metering component according to an embodiment of the present invention.

[0016] Figure 5 It is an exploded view of the leakage protection metering component according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] like Figures 1 to 5As shown, the embodiment of the present invention is an automatic reclosing miniature circuit breaker, comprising a circuit breaker unit 10, an automatic reclosing device 11 assembled with the circuit breaker unit 10, the circuit breaker unit 10 comprising an N line switch module 12 arranged on one side of the automatic reclosing device 11, an L line switch module 13 arranged on one side of the N line switch module 12, and a leakage protection metering module 20 arranged on one side of the N line switch module 12 and the L line switch module 13, the leakage protection metering module 20 comprising a housing 21, a leakage protection metering component 22 arranged in the housing 21, The leakage protection metering assembly 22 includes a leakage protection circuit board 221, two manganese copper steel conductive tubes 222, a zero sequence mutual inductor 223 mounted on the two manganese copper steel conductive tubes 222, two wiring terminals 224, and two conductive sheets 225 respectively connected between the two wiring terminals 224 and the two manganese copper steel conductive tubes 222. One end of the two manganese copper steel conductive tubes 222 is respectively electrically connected to the N line switch module 12 and the L line switch module 13, and a wire 226 is respectively connected between the two ends of the manganese copper steel conductive tubes 222 and the leakage protection circuit 221. The housing 21 and the housing 121 of the N line switch module and the L line switch module are assembled in a snap-fit ​​connection manner, so that the assembly of the leakage protection metering module with the N line switch module and the L line switch module is more efficient. The two ends of the manganese copper steel conductive tube 222 are respectively provided with a first wiring nose 227 and a second wiring nose 228, one end of the two wires 226 are respectively connected to the first wiring nose 227 and the second wiring nose 228, and the other end of the two wires 226 is provided with a pin 229, which is plugged into the leakage protection circuit board 221. The manganese copper steel conductive tube is electrically connected to the leakage protection circuit board through the first wiring nose, the second wiring nose, the two wires, and the pin, so that the assembly is more convenient and it is also conducive to improving the electrical connection reliability of the leakage protection. Two screws 230 are respectively provided in the two manganese copper steel conductive tubes 222, and the two screws 230 pass through the conductive sheet 225, the second wiring nose 228, the manganese copper steel conductive tube 222, and the first wiring nose 227 in sequence and are respectively connected to the N line switch module 12 and the L line switch module 12. The use of screws for transverse through-type connection on the N-line switch module and the L-line switch module is beneficial to improving the assembly efficiency of the automatic reclosing miniature circuit breaker.

[0018] like Figure 2As shown, a power extraction piece 30 is respectively arranged in the two wiring terminals 224, and a plug pin 301 is arranged on one end of the power extraction piece 30, and the plug pin 301 is plugged into the leakage protection circuit board 221. One end of the power extraction piece 30 is inserted into the wiring terminal 224, and constitutes an electrical connection between the power extraction piece 30 and the wiring terminal 224. Power extraction pieces are respectively arranged on the two wiring terminals, and the power extraction pieces can collect the voltage signals of the wiring terminals to the leakage protection circuit board, thereby realizing the voltage implementation monitoring function of the automatic reclosing miniature circuit breaker, and the power extraction piece and the leakage protection circuit board are connected by plugging, which is more convenient to assemble.

[0019] like Figure 3 , 4 As shown in Figure 5, the zero-sequence transformer 223 includes a transformer housing 2331 and a coil arranged in the transformer. The transformer housing 2231 is provided with two through holes 2232 for two manganese copper steel conductive tubes 222 to pass through, and a partition 2233 is arranged between the two conductive sheets 225 on the transformer housing 2231. A partition is arranged between the two conductive sheets, which can play an insulating and isolating role, and can increase the creepage distance between the two conductive sheets, which is beneficial to improving the safety performance of the automatic reclosing miniature circuit breaker. A slot 2234 is arranged on the transformer housing 2231 corresponding to the second wiring nose 228, and one end of the second wiring nose 228 is engaged in the slot 2234, and the second wiring nose 228 is engaged with the transformer housing 2231. The second wiring nose and the transformer housing are snap-fitted, so that the second wiring nose and the transformer housing are easily assembled, and the second wiring nose will not rotate at will, which can ensure that the connection between the second wiring nose and the transformer housing is more compact. In particular, a limiting groove 2235 is respectively provided on the transformer housing 2231 corresponding to the two conductive sheets 225, and the two conductive sheets 225 are respectively snapped into the corresponding limiting grooves 2235, and the transformer housing 2231 and the two conductive sheets 225 are limited. The conductive sheet and the transformer housing are limited, so that the assembly of the leakage protection metering component is convenient, which is conducive to improving the assembly efficiency of the automatic reclosing small circuit breaker.

[0020] The automatic reclosing small circuit breaker adopts a modular structure design. The circuit breaker unit consists of an N-line switch module, an L-line switch module, and a leakage protection module. It can be flexibly assembled according to user needs, and the leakage protection module is mounted on the N-line switch module and the L-line switch module, which is more convenient to assemble, which is conducive to improving production efficiency, and can realize the leakage protection and metering functions of the automatic reclosing small circuit breaker. The leakage protection module uses a manganese copper steel conductive tube to measure the current to achieve the purpose of metering. The structural design is simple and the production cost is lower. Therefore, the automatic reclosing small circuit breaker has the advantages of simple structure, stable and reliable performance, small size, convenient assembly and low cost.

Claims

1. An automatic reclosing miniature circuit breaker, comprising a circuit breaker unit and an automatic reclosing device assembled with the circuit breaker unit, characterized in that: The circuit breaker unit comprises an N-line switch module arranged on one side of the automatic reclosing device, an L-line switch module arranged on one side of the N-line switch module, and a leakage protection metering module arranged on one side of the N-line switch module and the L-line switch module. The leakage protection metering module comprises a shell and a leakage protection metering component arranged in the shell. The leakage protection metering component comprises a leakage protection circuit board, two manganese-copper steel conductive tubes, a zero-sequence mutual inductor sleeved on the two manganese-copper steel conductive tubes, two wiring terminals, and two conductive sheets respectively connected between the two wiring terminals and the two manganese-copper steel conductive tubes. One end of the two manganese-copper steel conductive tubes is electrically connected to the N-line switch module and the L-line switch module respectively. A wire is respectively connected between the two ends of the manganese-copper steel conductive tube and the leakage protection circuit. The two ends of the manganese-copper steel conductive tube are respectively provided with a first wiring nose and a second wiring nose. One end of the two wires is respectively connected to the first wiring nose and the second wiring nose, and a pin is provided on the other end of the two wires, which is plugged into the leakage protection circuit board.

2. The automatic reclosing miniature circuit breaker according to claim 1 is characterized in that: Two screws are respectively arranged in the two manganese-copper steel conductive tubes. The two screws respectively pass through the conductive sheet, the second wiring nose, the manganese-copper steel conductive tube, and the first wiring nose in sequence and are respectively connected to the N line switch module and the L line switch module.

3. The automatic reclosing miniature circuit breaker according to claim 1 or 2, characterized in that: A power extraction piece is respectively arranged in the two wiring terminals, and a plug pin is arranged on one end of the power extraction piece, which is plugged into the leakage protection circuit board. One end of the power extraction piece is inserted into the wiring terminal to form an electrical connection between the power extraction piece and the wiring terminal.

4. The automatic reclosing miniature circuit breaker according to claim 1 or 2, characterized in that: The zero-sequence transformer comprises a transformer housing and a coil arranged in the transformer. The transformer housing is respectively provided with two through holes for two manganese-copper steel conductive tubes to pass through, and a partition is arranged between two corresponding conductive sheets on the transformer housing.

5. The automatic reclosing miniature circuit breaker according to claim 4 is characterized in that: A slot is provided on the transformer housing corresponding to the second wiring lug, one end of the second wiring lug is engaged in the slot, and the second wiring lug is engaged with the transformer housing.

6. The automatic reclosing miniature circuit breaker according to claim 4, characterized in that: A limiting groove is respectively arranged on the transformer housing corresponding to the two conductive sheets, and the two conductive sheets are respectively engaged in the corresponding limiting grooves, thereby forming a limiting fit between the transformer housing and the two conductive sheets.

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