An automatic reclosing miniature circuit breaker

Abstract

The utility model belongs to the field of circuit breaker, concretely relates to a kind of automatic reclosing small circuit breaker, including circuit breaker unit and electric operating mechanism, circuit breaker unit includes multi-pole circuit breaker body, each pole circuit breaker body includes shell and switch assembly and zero sequence mutual inductor and incoming line terminal and outgoing line terminal, the shell of multi-pole circuit breaker body is respectively provided with current sampling module, leakage sampling module at corresponding incoming line terminal, outgoing line terminal place, current sampling module includes current sampling circuit board and multiple current sampling leads and multiple needle seat, multiple needle seat one end is respectively inserted in current sampling circuit board, and the other end of multiple needle seat is respectively connected on multiple current sampling leads.Current sampling module, leakage sampling module adopt modular structure design, can realize the modular assembly of automatic reclosing small circuit breaker, and assembly efficiency is higher, and current sampling module, leakage sampling module adopt plug-in type mode connection, and connection is more reliable.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breaker technology, specifically relating to an automatic reclosing miniature circuit breaker. Background Technology

[0002] Miniature circuit breakers (MCBs) are widely used in low-voltage power distribution networks, primarily in various locations including industrial, commercial, high-rise, and residential buildings. They provide overcurrent and leakage protection for electrical equipment such as motors, power lines, and lighting circuits. Traditionally, the opening and closing operations of miniature circuit breakers require manual operation. With the development of my country's smart grid, the need for intelligent control of electrical appliances is becoming increasingly urgent while ensuring the safe operation of the grid. To address these new demands, miniature circuit breakers should possess automatic reclosing functionality. The electric operating mechanism of an automatic reclosing miniature circuit breaker is an accessory for remote electric opening and closing of circuit breakers. It works directly with prepaid electricity meters to enable reclosing after payment.

[0003] The existing automatic reclosing miniature circuit breaker has a relatively complex structural design. When assembling its internal current and leakage current sampling structure, it is necessary to first drill through holes in the housing, and then pass the wires through the through holes and weld them to the sampling circuit board. The assembly is cumbersome, cannot achieve modular assembly, has low assembly efficiency, and the wires are prone to loosening from the sampling circuit board, resulting in unreliable connection between the wires and the sampling circuit board. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a modularly assembled automatic reclosing miniature circuit breaker.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An automatic reclosing miniature circuit breaker includes a circuit breaker unit and an electric operating mechanism for driving the circuit breaker unit to perform opening and closing operations. The circuit breaker unit includes a multi-pole circuit breaker body assembled with each other. Each pole of the circuit breaker body includes a housing, a switch assembly disposed within the housing, a zero-sequence current transformer disposed within the housing, an incoming terminal, and an outgoing terminal. A current sampling module and a leakage current sampling module are respectively disposed on the housing of the multi-pole circuit breaker body at the corresponding incoming terminal and outgoing terminal. The current sampling module includes a current sampling circuit board disposed on the housing, multiple current sampling wires and multiple pin sockets respectively connected to the incoming terminal of each pole of the circuit breaker body. The multiple pin sockets are respectively disposed between the housings of each adjacent two poles of the circuit breaker body. One end of each of the multiple pin sockets is inserted into the current sampling circuit board, and the other end of each of the multiple pin sockets is connected to the multiple current sampling wires.

[0006] In some embodiments, the housing of the multi-pole circuit breaker body is provided with a groove for accommodating a current sampling circuit board, the housing is provided with a cover covering the current sampling circuit board, and the multiple current sampling wires are provided with multiple current sampling connectors that are plugged into multiple pin sockets.

[0007] In some embodiments, the leakage current sampling module includes a leakage current sampling circuit board and connectors disposed on a housing, and multiple leakage current sampling wires respectively connected to a zero-sequence current transformer. A protective cover is provided on the leakage current sampling circuit board on the housing. The connectors are disposed between the housings of adjacent two-pole circuit breaker bodies. One end of the connector is inserted into the leakage current sampling circuit board, and the other end of the connector is connected to the multiple leakage current sampling wires.

[0008] In some embodiments, the zero-sequence current transformer includes an insulating housing and an iron core assembly disposed within the insulating housing. The circuit breaker unit is provided with a receiving cavity for accommodating the insulating housing. The insulating housing includes a bottom shell and an upper shell. The upper shell is detachably connected to the bottom shell. A cavity for placing the iron core assembly is formed between the bottom shell and the upper shell. The multiple leakage current sampling wires are provided with leakage current sampling connectors that are plugged into the connectors.

[0009] In some embodiments, a power board receiving cavity is provided above the magnetic yoke corresponding to each pole of the circuit breaker body in the circuit breaker unit. A power circuit board is provided in the power board receiving cavity, and a conductive spring piece is provided on the power circuit board to abut against the magnetic yoke of each pole of the circuit breaker body.

[0010] In some embodiments, the electric operating mechanism includes a housing and an electric operating component and a main circuit board disposed within the housing. A padlock is slidably disposed on the housing. One end of the padlock is provided with a release lever for driving the release component of the electric operating component to perform a release action. The other end of the padlock is provided with a padlock hole.

[0011] In some embodiments, a magnet is provided on the side of the padlock facing the main circuit board, a Hall sensor that cooperates with the magnet is provided on the main circuit board, a control circuit board electrically connected to the main circuit board is provided inside the housing, a display screen is provided on the control circuit board, and a display window is provided on the housing corresponding to the display screen.

[0012] In some embodiments, a sliding groove is provided inside the housing, the padlock is slidably disposed in the sliding groove, the padlock is provided with an elastic positioning arm, the sliding groove is provided with a locking groove and an unlocking groove that cooperate with the elastic positioning arm, and the padlock drives the elastic positioning arm to reciprocate between the locking groove and the unlocking groove.

[0013] In some embodiments, the circuit breaker unit housing is respectively attached to two protective covers that cover the inlet wiring hole and outlet wiring hole of each pole circuit breaker unit. Each protective cover is provided with multiple locking holes. The housing is provided with multiple locking plates that are inserted into the multiple locking holes. Each locking plate is provided with lead-sealed holes.

[0014] In some embodiments, the two protective covers are provided with multiple hooks corresponding to the inlet and outlet wiring holes, and the inlet and outlet wiring holes are provided with slots that engage with the multiple hooks.

[0015] The beneficial effects of this utility model are as follows: the current sampling module and the leakage current sampling module adopt a modular structure design, which can realize the modular assembly of the automatic reclosing miniature circuit breaker, resulting in higher assembly efficiency. The current sampling module and the leakage current sampling module are connected by a plug-in method, making the connection more reliable. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0017] Figure 1 This is a perspective view of an embodiment of the present utility model;

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

[0019] Figure 3 This is an internal structural diagram of an embodiment of the present utility model;

[0020] Figure 4 This is an assembly drawing of the padlock component and the outer shell according to an embodiment of the present utility model;

[0021] Figure 5 This is an assembly diagram of the power circuit board and conductive spring sheet according to an embodiment of the present utility model;

[0022] Figure 6 This is an exploded view of the zero-sequence current transformer according to an embodiment of the present invention;

[0023] Figure 7 This is a perspective view of the protective cover according to an embodiment of the present utility model;

[0024] Figure 8 This is a perspective view of the display screen-less structure of an embodiment of the present utility model. Detailed Implementation

[0025] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0027] The directional and positional terms used in this utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0028] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments:

[0029] like Figure 1-3As shown, an automatic reclosing miniature circuit breaker includes a circuit breaker unit 1 and an electric operating mechanism 2 for driving the circuit breaker unit 1 to perform opening and closing operations. The circuit breaker unit 1 includes multi-pole circuit breaker bodies 10 assembled together. Each pole circuit breaker body 10 includes a housing 11, a switch assembly disposed within the housing 11, a zero-sequence current transformer 12 disposed within the housing 11, an incoming terminal 13, and an outgoing terminal 14. The housing 11 of the multi-pole circuit breaker body 10 has corresponding terminals for the incoming terminal 13 and the outgoing terminal 14. The circuit breaker is equipped with a current sampling module 3 and a leakage current sampling module 4. The current sampling module 3 includes a current sampling circuit board 31 mounted on the housing 11, multiple current sampling wires 32 connected to the incoming terminal blocks 13 of each pole circuit breaker body 10, and multiple pin holders 33. The multiple pin holders 33 are respectively located between the housings 11 of each adjacent pair of pole circuit breaker bodies 10. One end of each pin holder 33 is inserted into the current sampling circuit board 31, and the other end is connected to the multiple current sampling wires 32. The housing 11 of the multi-pole circuit breaker body 10 is provided with a slot 100 for accommodating the current sampling circuit board 31, and a cover 15 covering the current sampling circuit board 31 is provided on the housing 11. Multiple current sampling connectors 320 are provided on the multiple current sampling wires 32 to be inserted into the multiple pin holders 33. The multiple current sampling wires are inserted into the multiple pin holders through the current sampling connectors, which facilitates the insertion and removal of multiple current sampling wires and pins, making assembly more convenient and the connection more reliable. During assembly, fasteners are sequentially passed through the cover and the current sampling circuit board and connected to the slot to complete the assembly of the cover and the current sampling circuit board. The cover covers the current sampling circuit board, and the cover plays a protective role, preventing the current sampling circuit board from being exposed outside the housing. The leakage current sampling module 4 includes a leakage current sampling circuit board 41 and a connector 42 disposed on the housing 11, and multiple leakage current sampling wires 43 respectively connected to the zero-sequence current transformer 12. A protective cover plate 44 is provided on the leakage current sampling circuit board 41 covered by the cover on the housing 11. The connector 42 is disposed between the housings 11 of adjacent two-pole circuit breaker bodies 10. One end of the connector 42 is inserted into the leakage current sampling circuit board 41, and the other end of the connector 42 is connected to the multiple leakage current sampling wires 43. The leakage current sampling module adopts a modular structure design, which enables modular assembly of the screw sampling module and the housing, resulting in higher assembly efficiency. The anti-slip cover provides protection and prevents the leakage current sampling circuit board from being exposed outside the housing. The leakage current sampling circuit board and the leakage current sampling wire are connected by connectors, making the connection more reliable.

[0030] like Figure 2 , 3As shown in Figure 6, the zero-sequence current transformer 12 includes an insulating housing 121 and an iron core assembly 122 disposed within the insulating housing 121. The circuit breaker unit 1 has a receiving cavity 101 for accommodating the insulating housing 121. The insulating housing 121 includes a bottom shell 1211 and an upper shell 1212. The upper shell 1212 is detachably connected to the bottom shell 1211. A cavity 120 for placing the iron core assembly 122 is formed between the bottom shell 1211 and the upper shell 1212. Multiple leakage current sampling wires 43 are equipped with leakage current sampling connectors 430 that plug into connectors 42. The leakage current sampling wires are connected via leakage current sampling connectors, facilitating the insertion and removal of the leakage current sampling wires and connectors, making assembly more convenient and the connection more reliable. Compared to the traditional method of wrapping insulating tape around the iron core assembly, placing the iron core assembly inside the insulating housing provides more reliable insulation performance. The bottom shell 1211 is provided with multiple hooks 1213, and the top shell 1212 is provided with multiple locking holes 1214 that engage with the hooks 1213. The bottom shell and the top shell are connected by a snap-fit ​​mechanism, which facilitates the assembly of the zero-sequence current transformer and improves assembly efficiency.

[0031] like Figure 2 , 3 As shown in Figure 5, a power board receiving cavity 103 is provided above the magnetic yoke of each pole circuit breaker body 10 within the circuit breaker unit 1. A power circuit board 16 is housed within the power board receiving cavity 103, and conductive spring contacts 17 are respectively provided on the power circuit board 16 to abut against the magnetic yoke 160 of each pole circuit breaker body 10. The power board receiving cavity 103 is provided with snap-fit ​​grooves 1031 that engage with both sides of the power circuit board 16. The power board contacts the magnetic yoke of the electromagnetic trip unit through the conductive spring contacts, thereby enabling power to be drawn from the power board. This structural design makes assembly more convenient and the electrical connection more reliable.

[0032] like Figure 1 , 2As shown in Figure 4, the electric operating mechanism 2 includes a housing 21 and an electric operating component 22 and a main circuit board 23 disposed within the housing 21. A padlock 24 is slidably disposed on the housing 21. One end of the padlock 24 is provided with a trip lever 241 for driving the tripping component 221 of the electric operating component 22 to perform a tripping action, and the other end of the padlock 24 is provided with a padlock hole 242. The padlock can realize the locking function of the automatic reclosing miniature circuit breaker, thereby ensuring the personal safety of maintenance personnel. During operation, the padlock is pulled out of the housing, and the padlock is hung on the padlock hole. The trip lever of the padlock abuts against the tripping component, keeping the tripping component in a tripped state, and the automatic reclosing miniature circuit breaker cannot be closed, thereby realizing the locking of the automatic reclosing miniature circuit breaker. A magnet 25 is mounted on the side of the padlock 24 facing the main circuit board 23. A Hall effect sensor 26, cooperating with the magnet 25, is mounted on the main circuit board 23. A control circuit board 27, electrically connected to the main circuit board 23, is located inside the housing 21. A display screen 271 is mounted on the control circuit board 27, and a display window 272 is located on the housing 21 corresponding to the display screen 271. The Hall effect sensor on the main circuit board detects the position of the magnet. When the padlock is pulled to the locked position, the Hall effect sensor on the main circuit board sends a locked signal to the backend, allowing the user to monitor the operating status of the automatic reclosing miniature circuit breaker, thereby improving its reliability. The display screen shows the circuit breaker's switch status, fault information, and operation instructions in real time, helping operators quickly understand the circuit breaker's operation and respond accordingly. Figure 8 As shown, a miniature circuit breaker with an automatic reclosing structure without a display screen can also be set according to user needs.

[0033] The outer casing 21 has a sliding groove 211, and the padlock 24 is slidably disposed within the sliding groove 211. The padlock 24 is equipped with an elastic positioning arm 243. The sliding groove 211 has a locking groove 212 and an unlocking groove 213 that cooperate with the elastic positioning arm 243. The padlock 24 drives the elastic positioning arm 243 to reciprocate between the locking groove 212 and the unlocking groove 213. The sliding of the padlock within the sliding groove facilitates the assembly of the padlock with the outer casing, and the elastic positioning arm provides positioning, thus improving the reliability of the padlock's operation.

[0034] like Figure 1 , 2As shown in Figure 7, the housing 11 of circuit breaker unit 1 is detachably connected to two protective covers 18 that cover the inlet wiring hole 104 and outlet wiring hole 105 of each pole circuit breaker unit 10. Each protective cover 18 is provided with multiple locking holes 181, and the housing 11 is provided with multiple locking plates 19 that are inserted into the multiple locking holes 181. Each locking plate 19 is provided with a lead-sealed hole 191. The protective covers can prevent the inlet wiring hole and outlet wiring hole from being exposed, preventing others from connecting and disconnecting wires at will, thus improving safety performance. The two protective covers 18 are provided with multiple hooks 182 corresponding to the inlet wiring hole 104 and outlet wiring hole 105, and the inlet wiring hole 104 and outlet wiring hole 105 are provided with slots 1051 that engage with the multiple hooks 182. The protective covers and the housing are connected by a snap-fit ​​method, which facilitates the assembly of the protective covers and the housing and improves assembly efficiency.

[0035] The current sampling module and leakage current sampling module adopt a modular structure design, which can realize the modular assembly of automatic reclosing miniature circuit breakers, resulting in higher assembly efficiency. The current sampling module and leakage current sampling module are connected by a plug-in method, making the connection more reliable.

[0036] The above description is only one embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model; the scope of protection of the present utility model is defined by the claims in the claims, and all equivalent changes and modifications made in accordance with the utility model are within the scope of protection of the present utility model patent.

Claims

1. An automatic reclosing miniature circuit breaker, comprising a circuit breaker unit and an electric operating mechanism for driving the circuit breaker unit to perform opening and closing operations, wherein the circuit breaker unit comprises a multi-pole circuit breaker body assembled with each other, each pole of the circuit breaker body comprising a housing, a switch assembly disposed within the housing, a zero-sequence current transformer disposed within the housing, an incoming line terminal, and an outgoing line terminal, characterized in that: The multi-pole circuit breaker body has a current sampling module and a leakage current sampling module respectively installed on the housing corresponding to the incoming line terminal and the outgoing line terminal. The current sampling module includes a current sampling circuit board installed on the housing, multiple current sampling wires connected to the incoming line terminal of each pole circuit breaker body, and multiple pin sockets. The multiple pin sockets are respectively installed between the housings of each adjacent two pole circuit breaker bodies. One end of each pin socket is inserted into the current sampling circuit board, and the other end of each pin socket is connected to the multiple current sampling wires.

2. The automatic reclosing miniature circuit breaker according to claim 1, characterized in that: The multi-pole circuit breaker body has a slot for accommodating a current sampling circuit board on its housing, and a cover for covering the current sampling circuit board on the housing. Multiple current sampling connectors that are plugged into multiple pin sockets are provided on the multiple current sampling wires.

3. The automatic reclosing miniature circuit breaker according to claim 1 or 2, characterized in that: The leakage current sampling module includes a leakage current sampling circuit board and connectors mounted on the housing, and multiple leakage current sampling wires respectively connected to the zero-sequence current transformer. The housing is equipped with a protective cover plate on the leakage current sampling circuit board. The connectors are located between the housings of adjacent two-pole circuit breaker bodies. One end of the connector is inserted into the leakage current sampling circuit board, and the other end of the connector is connected to the multiple leakage current sampling wires.

4. The automatic reclosing miniature circuit breaker according to claim 3, characterized in that: The zero-sequence current transformer includes an insulating shell and an iron core assembly disposed within the insulating shell. The circuit breaker unit is provided with a cavity for accommodating the insulating shell. The insulating shell includes a bottom shell and an upper shell. The upper shell is detachably connected to the bottom shell. A cavity for placing the iron core assembly is formed between the bottom shell and the upper shell. The multiple leakage current sampling wires are provided with leakage current sampling connectors that are plugged into the connectors.

5. The automatic reclosing miniature circuit breaker according to claim 1, characterized in that: The circuit breaker unit has a power board accommodating cavity located above the magnetic yoke of each circuit breaker body. The power board accommodating cavity contains a power circuit board, and the power circuit board has conductive spring contacts that abut against the magnetic yoke of each circuit breaker body.

6. The automatic reclosing miniature circuit breaker according to claim 1, characterized in that: The electric operating mechanism includes a housing and an electric operating component and a main circuit board disposed within the housing. A padlock is slidably disposed on the housing. One end of the padlock is provided with a release lever for driving the release component of the electric operating component to perform a release action. The other end of the padlock is provided with a padlock hole.

7. The automatic reclosing miniature circuit breaker according to claim 6, characterized in that: The padlock component has a magnet on the side facing the main circuit board. The main circuit board has a Hall sensor that works with the magnet. The housing contains a control circuit board that is electrically connected to the main circuit board. The control circuit board has a display screen. The housing has a display window corresponding to the display screen.

8. The automatic reclosing miniature circuit breaker according to claim 6 or 7, characterized in that: The outer casing is provided with a sliding groove, the padlock is slidably disposed in the sliding groove, the padlock is provided with an elastic positioning arm, the sliding groove is provided with a locking groove and an unlocking groove that cooperate with the elastic positioning arm, and the padlock drives the elastic positioning arm to switch back and forth between the locking groove and the unlocking groove.

9. The automatic reclosing miniature circuit breaker according to claim 1, characterized in that: The circuit breaker unit housing is detachably connected to two protective covers that cover the inlet and outlet wiring holes of each pole circuit breaker unit. Each protective cover is provided with multiple locking holes. The housing is provided with multiple locking plates inserted into the multiple locking holes. Each of the multiple locking plates is provided with lead seal holes.

10. The automatic reclosing miniature circuit breaker according to claim 9, characterized in that: The two protective covers are provided with multiple hooks corresponding to the inlet and outlet wiring holes, and the inlet and outlet wiring holes are provided with slots that engage with the multiple hooks.

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