Arc extinguishing structure for circuit breaker and circuit breaker
By designing arc-extinguishing structures in the circuit breaker's return and open zones, and utilizing internal airflow circulation and exhaust channels to control the arc, the problem of large arc energy during the breaking of high-voltage DC circuit breakers is solved, achieving safer and more effective arc management and equipment protection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-12
- Publication Date
- 2026-03-13
AI Technical Summary
High-voltage DC circuit breakers generate large amounts of arc energy during disconnection, which may cause arcing damage to equipment. Existing technologies make it difficult to effectively control and manage the arc.
The system employs an arc-extinguishing structure, including an arc-extinguishing chamber and a shell. The internal cavity is divided into a recirculation zone and an open zone. The recirculation zone is closed and not connected to the outside, while the open zone is connected to the outside through an exhaust channel. The system utilizes the bidirectional internal circulation of airflow and the exhaust channel to control the electric arc and improve the arc-extinguishing effect.
Effective control of electric arcs reduces the risk of arc flash, improves breaking capacity, reduces the risk of equipment damage, reduces product size, and enhances safety.
Smart Images
Figure CN121662672A_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to an arc-extinguishing structure for a circuit breaker and a circuit breaker having said arc-extinguishing structure. Background Technology
[0002] A circuit breaker is an electrical switching device that automatically interrupts current when an abnormal current (such as an overload or short circuit) is detected in a circuit, protecting the circuit and connected equipment from damage. Circuit breakers are widely used in electrical systems in homes, industrial, and commercial buildings to ensure electrical safety and reliability.
[0003] Circuit breakers may generate electric arcs when performing their breaking tasks. This is especially true for high-voltage DC circuit breakers, where the arc energy is relatively high. If these arcs are not properly controlled, they may come into contact with nearby electrical products or cabinet components, causing a short circuit. This can lead to serious consequences such as electrical fires, equipment damage, and threats to personnel safety.
[0004] Therefore, there is a need for an arc management and control scheme for circuit breakers, especially high-voltage DC circuit breakers, to ensure that the arc can be safely guided and extinguished during disconnection, and to prevent arcing from damaging the equipment. Summary of the Invention
[0005] In response to the problems and needs mentioned above, this disclosure proposes an arc-extinguishing structure for a circuit breaker and a circuit breaker having the arc-extinguishing structure. The above problems are solved and other technical effects are brought about by adopting the following technical features.
[0006] On one hand, this disclosure proposes an arc-extinguishing structure for a circuit breaker, including an arc-extinguishing chamber and a housing. The arc-extinguishing chamber includes a plurality of arc-extinguishing plates spaced apart from each other and has a front end near the arc-generating region and a rear end away from the arc-generating region. The housing has an internal cavity that accommodates the arc-extinguishing chamber. The internal cavity includes a return current region and an open region. The return current region is closer to the stationary contact of the circuit breaker than the open region. The return current region is not connected to the outside of the internal cavity of the housing, and the open region is connected to the outside of the internal cavity of the housing through an exhaust channel.
[0007] According to a preferred embodiment, the reflux zone and the open zone are separated by a partition wall on the housing.
[0008] The shell includes a first half-shell and a second half-shell located on both sides of the arc-extinguishing chamber, and the partition wall is formed by joining a first half-wall extending from the first half-shell and a second half-wall extending from the second half-shell.
[0009] According to a preferred embodiment, the volume of the recirculation zone is larger than the volume of the open zone.
[0010] According to a preferred embodiment, the arc-extinguishing chamber further includes a first insulating side plate and a second insulating side plate for holding the plurality of arc-extinguishing plates.
[0011] According to the preferred embodiment, the rear end of the arc-extinguishing chamber, the first insulating side plate, and the second insulating side plate are all spaced apart from the inner wall of the shell. At the rear end of the arc-extinguishing chamber, the shell does not have an airflow outlet, so that the airflow ejected from the rear end of the arc-extinguishing chamber enters into the first channel between the first insulating side plate and the inner wall of the shell and the second channel between the second insulating side plate and the inner wall of the shell.
[0012] According to a preferred embodiment, the arc-extinguishing structure includes a first gas-generating plate and a second gas-generating plate arranged in parallel, with an airflow nozzle formed between the first gas-generating plate and the second gas-generating plate for guiding airflow into the arc-extinguishing chamber.
[0013] According to a preferred embodiment, the exhaust passage includes a first exhaust passage and a second exhaust passage, and in the open area, the first passage leads to the outside of the internal cavity via the first exhaust passage, and the second passage leads to the outside of the internal cavity via the second exhaust passage.
[0014] According to a preferred embodiment, the first exhaust channel is formed between the inner wall of the housing and the first gas-generating plate, and the second exhaust channel is formed between the inner wall of the housing and the second gas-generating plate.
[0015] According to a preferred embodiment, the first exhaust channel is formed by the docking of a first groove on the inner wall of the housing and a first corresponding groove on the first gas-generating plate, and the second exhaust channel is formed by the docking of a second groove on the inner wall of the housing and a second corresponding groove on the second gas-generating plate.
[0016] According to a preferred embodiment, the first exhaust passage and the second exhaust passage are respectively opened on the first sidewall and the second sidewall of the housing located on both sides of the arc-extinguishing chamber.
[0017] According to a preferred embodiment, in the recirculation zone, the arc-extinguishing structure includes a first recirculation inlet for directing airflow from the first channel to the interior of the arc-extinguishing chamber, and a second recirculation inlet for directing airflow from the second channel to the interior of the arc-extinguishing chamber.
[0018] According to a preferred embodiment, the first return inlet is formed between the first gas generating plate and the first insulating side plate, and the second return inlet is formed between the second gas generating plate and the second insulating side plate.
[0019] This disclosure also proposes a circuit breaker including an arc-extinguishing structure as described in any of the preceding statements.
[0020] According to a preferred embodiment, the circuit breaker further includes a stationary contact, wherein the return region is closer to the stationary contact than the open region.
[0021] The preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings so that the features and advantages of the present disclosure can be readily understood. Attached Figure Description
[0022] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments of this disclosure will be briefly described below. The drawings are merely illustrative of some embodiments of this disclosure and are not intended to limit all embodiments of this disclosure to them.
[0023] Figure 1 A preferred embodiment of the circuit breaker and its arc-extinguishing structure according to the present disclosure is shown;
[0024] Figure 2 It shows Figure 1 A cross-sectional view of the return current zone of the circuit breaker;
[0025] Figure 3 It shows Figure 1 A cross-sectional view of the open area of the circuit breaker;
[0026] Figure 4 It shows Figure 1 A three-dimensional sectional view of the open area of the circuit breaker;
[0027] Figure 5 It shows Figure 2 A partial view;
[0028] Figure 6 It shows Figure 1 The structure of the first half-shell of the circuit breaker;
[0029] Figure 7 The structure of the first gas-generating plate is shown.
[0030] List of reference numerals
[0031] 10 Arc-extinguishing chamber
[0032] 11 Arc extinguishing plates
[0033] 12 First Insulating Side Plate
[0034] 13 Second Insulating Side Plate
[0035] 14 First gas-producing section
[0036] 141 First Corresponding Groove
[0037] 15 Second gas-producing plate
[0038] 20. Housing
[0039] 21 Reflux Zone
[0040] 22 Open Area
[0041] 23. Partition wall
[0042] 24 First Half Shell
[0043] 241 First Groove
[0044] 25 Second Half Shell
[0045] 26 First sidewall
[0046] 27 Second sidewall
[0047] 28 First Passage
[0048] 29 Second Channel
[0049] 30 First exhaust passage
[0050] 31 Second exhaust passage
[0051] 32 Exports
[0052] 33 First Reflux Inlet
[0053] 34 Second Reflux Inlet
[0054] 40 stationary contact Detailed Implementation
[0055] To make the objectives, technical solutions, and advantages of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.
[0056] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of this disclosure may have fewer components, other components not shown in the drawings, different components, components arranged differently, or components with different connections, etc. Furthermore, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.
[0057] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, “an” or “a” and similar terms do not necessarily indicate a quantity limitation. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships, which may change accordingly when the absolute position of the described object changes.
[0058] This disclosure relates to an arc-extinguishing structure for a circuit breaker and a circuit breaker having said arc-extinguishing structure. The arc-extinguishing structure includes an arc-extinguishing chamber 10 and a housing 20, with the arc-extinguishing chamber 10 housed within an internal cavity of the housing 20. By dividing the internal cavity into different regions, namely a return current region 21 and an open region 22 described below, this disclosure can cleverly adjust the pressure gradient in each region of the arc-extinguishing chamber 10. Therefore, this arc-extinguishing structure, or the circuit breaker employing it, can improve breaking capacity while more effectively controlling arcing. Simultaneously, the product size can be significantly reduced, and safety risks such as short-circuit breakdown are controlled.
[0059] It should be noted that the internal cavity may also include other areas besides the reflux area 21 and the open area 22. However, preferably, the internal cavity only includes the reflux area 21 and the open area 22.
[0060] The specific features of the arc-extinguishing structure of this disclosure are described below with reference to the accompanying drawings. Figure 1 A preferred embodiment of the circuit breaker and its arc-extinguishing structure according to the present disclosure is shown. Figure 2 and Figure 3 Cross-sectional views of the reflux zone 21 and the open zone 22 are shown respectively. Figure 4 A three-dimensional sectional view of open area 22 is shown. Figure 5 It shows Figure 2 A partial view, Figure 6 It shows Figure 1 The structure of the first half-shell 24 of the circuit breaker, Figure 7 The structure of the first gas-generating plate 14 is shown.
[0061] Generally, the arc-extinguishing structure for a circuit breaker disclosed herein includes an arc-extinguishing chamber 10 and a housing 20. The housing 20 has an internal cavity that accommodates the arc-extinguishing chamber 10. The wall portion defining the internal cavity is referred to as the housing inner wall.
[0062] An electric arc is typically generated when the moving and stationary contacts of a circuit breaker separate. In this disclosure, the area where an electric arc is generated when the moving and stationary contacts separate is referred to as the arc-generating region. The arc-extinguishing chamber 10 includes a plurality of arc-extinguishing plates 11 spaced apart from each other, and has a front end near the arc-generating region and a rear end away from the arc-generating region. The plurality of arc-extinguishing plates 11 extend between the front end and the rear end. The arc-extinguishing chamber 10 may further include a first insulating side plate 12 and a second insulating side plate 13 extending between its front end and rear end and arranged side by side, with the first insulating side plate 12 and the second insulating side plate 13 maintaining a plurality of arc-extinguishing plates 11 spaced apart from each other.
[0063] The electric arc generated when the moving and stationary contacts of the circuit breaker separate heats the nearby gas, causing the gas pressure in this area to rise and forming an airflow that flows into the arc-extinguishing chamber 10 from the front end to the rear end. Furthermore, the electric arc burns the first gas-generating plate 14 and the second gas-generating plate 15 (mentioned below), resulting in even higher gas pressure and thus strengthening the airflow. Due to the presence of this airflow, the electric arc generated when the moving and stationary contacts separate is blown into the interior of the arc-extinguishing chamber 10 from the front end. The airflow can then continue to flow out from the rear end of the arc-extinguishing chamber 10.
[0064] See the attached figures, especially Figure 1 As can be seen, this disclosure divides the internal cavity of the housing 20, which houses the arc-extinguishing chamber 10, into two distinct regions: a return flow region 21 and an open region 22. The return flow region 21 is closer to the stationary contact 40 of the circuit breaker than the open region 22. The return flow region 21 is a closed region not connected to the outside of the housing, while the open region 22 is connected to the outside of the housing via an exhaust channel. In both the return flow region 21 and the open region 22, the airflow enters the arc-extinguishing chamber 10 from the front end and continues flowing from the rear end. The difference lies in the fact that in the return flow region 21, because it is a closed region, the airflow can only flow within this region and cannot flow out of the internal cavity of the housing 20. In the open region 22, because it is not a closed region but has the exhaust channel, the airflow can flow out of the internal cavity of the housing 20 through the exhaust channel.
[0065] As shown in the figure, the return current zone 21 is closer to the stationary contact 40 of the circuit breaker than the open zone 22. Thus, when the moving and stationary contacts separate, the arc first enters the return current zone 21 of the arc-extinguishing chamber 10. The airflow recirculates within this return current zone 21, for example... Figure 2As shown, it helps reduce arc retreat and control arc flashback by using recirculation. When the arc enters the upper region of the arc-extinguishing chamber 10 (within... Figure 1 When the direction is referenced, the pressure in the entire enclosed cavity is already relatively high. At this time, through the setting of the open zone 22, the gas in the upper region can be discharged from the arc-extinguishing structure through the exhaust channel in the open zone 22. This gas discharge helps to control the pressure in the internal cavity of the shell 20 at a reasonable level, increasing the stability of the overall arc extinguishing and improving the overall arc extinguishing effect.
[0066] Preferably, the reflux zone 21 and the open zone 22 are separated by a partition wall 23 on the housing 20. This partition wall 23... Figure 1 and Figure 6 As shown in the figure. This disclosure does not limit the shape or size of the partition wall 23, as long as it can effectively separate the recirculation zone 21 and the open zone 22. In the preferred embodiment shown, the housing 20 includes a first half-shell 24 and a second half-shell 25 located on both sides of the arc-extinguishing chamber 10, i.e., the entire housing 20 is formed by joining the first half-shell 24 and the second half-shell 25. In this case, the partition wall 23 is preferably formed by joining the first half-wall 231 located on the first half-shell 24 and the second half-wall (not shown) located on the second half-shell 25. Figure 6 The first half-shell 24 and the first half-wall 231 located on the first half-shell 24 are shown. The second half-shell 25 may have a structure substantially the same as the first half-shell 24.
[0067] Preferably, the volume of the reflux region 21 is larger than the volume of the open region 22. Figure 1 From the perspective of [the region], the area of the recirculation zone 21 can be approximately twice the area of the open zone 22. This relationship is more conducive to the overall arc extinguishing effect.
[0068] The following mainly refers to Figure 2 , Figure 3 and combined Figure 4 , 5 Describe the specific characteristics of the reflux region 21 and the open region 22. Figure 2 The cross-section of the recirculation zone 21 and its airflow are shown. Figure 3 The cross-section of the open region 22 and its airflow are shown. First, let's introduce the commonalities. As shown, in both the recirculation region 21 and the open region 22, an airflow nozzle is formed between the first gas-generating vane 14 and the second gas-generating vane 15 to guide the airflow into the arc-extinguishing chamber 10. The airflow will pass through this airflow nozzle along a direction from the front end to the rear end of the arc-extinguishing chamber 10, i.e., along... Figure 2 and Figure 3The solid arrow pointing left from the center enters the interior of the arc-extinguishing chamber 10. In this disclosure, the arc-extinguishing structure is designed such that the rear end of the arc-extinguishing chamber 10, the first insulating side plate 12, and the second insulating side plate 13 are all spaced apart from the inner wall of the shell defining the internal cavity, thus creating space for airflow. Simultaneously, at the rear end of the arc-extinguishing chamber 10, the shell 20 does not have an airflow outlet; that is, the shell 20 has a solid structure at a certain distance from the rear end of the arc-extinguishing chamber 10. This prevents the airflow ejected from the rear end of the arc-extinguishing chamber 10 from continuing to flow backward. Instead, it is blocked by the shell structure at a certain distance from the rear end of the arc-extinguishing chamber 10, thus splitting into two paths: a first channel 28 between the first insulating side plate 12 and the inner wall of the shell, and a second channel 29 between the second insulating side plate 13 and the inner wall of the shell. As shown in the figure, the shell walls on both sides of the arc-extinguishing chamber 10 are respectively referred to as the first side wall 26 and the second side wall 27. The first channel 28 is formed between the first insulating side plate 12 and the first side wall 26, and the second channel 29 is formed between the second insulating side plate 13 and the second side wall 27.
[0069] The main difference between the reflux zone 21 and the open zone 22 lies in the downstream position of the first channel 28 and the second channel 29.
[0070] like Figure 2 As shown, in the recirculation zone 21, the arc-extinguishing structure includes a first recirculation inlet 33 for directing airflow from the first channel 28 into the arc-extinguishing chamber 10, and a second recirculation inlet 34 for directing airflow from the second channel 29 into the arc-extinguishing chamber 10. Through the first recirculation inlet 33, the airflow advancing along the first channel 28 between the first insulating side plate 12 and the inner wall of the housing can re-enter the arc-extinguishing chamber 10. Similarly, through the second recirculation inlet 34, the airflow advancing along the second channel 29 between the second insulating side plate 13 and the inner wall of the housing can re-enter the arc-extinguishing chamber 10, thereby forming... Figure 2 The dashed arrow indicates the bidirectional internal circulation reflux.
[0071] like Figure 2 Combination Figure 5 As shown, there is a gap between the first gas generating plate 14 and the first insulating side plate 12, so that the first return inlet 33 is formed between the first gas generating plate 14 and the first insulating side plate 12; similarly, there is a gap between the second gas generating plate 15 and the second insulating side plate 13, so that the second return inlet 34 is formed between the second gas generating plate 15 and the second insulating side plate 13.
[0072] Figure 2 The bidirectional internal circulation of airflow shown can effectively keep the arc within the arc-extinguishing chamber 10, preventing it from flowing back towards the arc-generating area, reducing the temperature, decreasing the arc-burning time of the contacts, and simultaneously increasing the arc voltage and reducing contact erosion.
[0073] It should be noted that, in embodiments not shown, the first return inlet 33 and the second return inlet 34 can also be located in other positions, as long as they can achieve the desired effect. Figure 2 This bidirectional internal circulation reflux state is sufficient.
[0074] For open zone 22, it does not have a first return inlet 33 and a second return inlet 34 like return zone 21, and therefore will not be as... Figure 2 This creates an internal recirculation flow that re-enters the arc-extinguishing chamber 10. As previously mentioned, the airflow in the open area 22 can communicate with the outside of the housing 20 through the exhaust passage. In a preferred embodiment, the exhaust passage extending from the open area 22 includes a first exhaust passage 30 and a second exhaust passage 31, with the first passage 28 leading to the outside of the internal cavity via the first exhaust passage 30, and the second passage 29 leading to the outside of the internal cavity via the second exhaust passage 31.
[0075] Figure 3 The arrows in the diagram illustrate the gas flow in open area 22. The gas flow first enters the arc-extinguishing chamber 10 through the gas nozzle formed between the first gas-generating plate 14 and the second gas-generating plate 15, following the solid arrow pointing to the left. It then flows out from the rear end of the arc-extinguishing chamber 10 and, blocked by a specific housing 20 at the rear end, splits into two paths, continuing along the first channel 28 and the second channel 29, but not as... Figure 2 Instead of forming an internal recirculation flow that re-enters the arc-extinguishing chamber 10, the flow exits the internal cavity of the housing 20 through the first exhaust channel 30 and the second exhaust channel 31, respectively, along the first channel 28 and the second channel 29.
[0076] Combination Figure 4 Preferably, the first exhaust channel 30 is formed between the inner wall of the housing and the first gas-generating plate 14, and the second exhaust channel 31 is formed between the inner wall of the housing and the second gas-generating plate 15. More preferably, the first exhaust channel 30 is formed by the mating of a first groove 241 on the inner wall of the housing and a first corresponding groove 141 on the first gas-generating plate 14. Figure 6 and Figure 7 The first groove 241 on the inner wall of the housing and the first corresponding groove 141 on the first gas-generating plate 14 are shown respectively. Similarly, the second exhaust channel 31 is formed by the mating of the second groove on the inner wall of the housing and the second corresponding groove on the second gas-generating plate 15. The second groove and the second corresponding groove may have the same or substantially the same structure as the first groove 241 and the first corresponding groove 141.
[0077] The closed-zone design disclosed herein ensures stable and easily controlled airflow. More importantly, it keeps the pressure inside the housing 20 at a reasonable level, increasing the stability of the overall arc extinguishing process and improving the overall arc extinguishing effect.
[0078] Preferably, the first exhaust passage 30 and the second exhaust passage 31 are respectively open on the first sidewall 26 and the second sidewall 27 of the housing 20 located on both sides of the arc-extinguishing chamber 10. Figure 1 The outlet 32 of the first exhaust passage 30 located on the first sidewall 26 is shown. By placing the outlets of the first and second exhaust passages 31 on the first sidewall 26 and the second sidewall 27, rather than on the housing portion at the rear end of the arc-extinguishing chamber 10, the electrical equipment and components behind them can be protected from the high-temperature airflow. More preferably, the outlet 32 of the first exhaust passage 20 is located below the inlet of the first exhaust passage 20, and at or upstream of the front end of the arc-extinguishing chamber.
[0079] The disclosed design incorporates a recirculation zone 21 and an open zone 22, leveraging the advantages of each: the recirculation zone 21 effectively keeps the arc within the arc-extinguishing chamber 10, improving arc retreat, while the open zone 22 ensures more stable overall airflow and internal chamber pressure. Simultaneously, it avoids the disadvantages of solely using the recirculation zone 21 or solely using the open zone 22: during development, the inventors discovered that if only the recirculation zone 21 is used, fluctuations in arcing time significantly impact gas pressure, requiring higher sealing, strength, and locking force from the breaking unit; conversely, if only the open zone 22 is used, arc flash management becomes difficult. The combination of the recirculation zone 21 and open zone 22 in this disclosure retains the advantages of both while avoiding their disadvantages, further achieving more effective arc flash control, adjustment of pressure gradients in various areas of the arc-extinguishing chamber 10, and improved overall arc extinguishing effects.
[0080] In the specific embodiment shown in the accompanying drawings, the circuit breaker is a double-break circuit breaker, and correspondingly has two sets of arc-extinguishing structures housed in two internal cavities of the housing 20, for arc extinguishing purposes at the two stationary contacts respectively. However, the arc-extinguishing structure of this disclosure can also be applied to a single-break circuit breaker, in which only one set of arc-extinguishing structures is provided.
[0081] The arc-extinguishing structure disclosed herein is applicable to both DC and AC circuit breakers. It is particularly suitable for high-voltage DC circuit breakers.
[0082] The exemplary implementation of the solution proposed in this disclosure has been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure, which is determined by the appended claims.
Claims
1. An arc-extinguishing structure for a circuit breaker, comprising: Arc-extinguishing chamber (10), the arc-extinguishing chamber (10) includes a plurality of arc-extinguishing plates (11) spaced apart from each other, and has a front end close to the arc-generating area and a rear end away from the arc-generating area; The housing (20) has an internal cavity that accommodates the arc-extinguishing chamber (10); The internal cavity includes a return flow area (21) and an open area (22). The return flow area (21) is closer to the stationary contact of the circuit breaker than the open area (22). The return flow area (21) is not connected to the outside of the internal cavity of the housing (20). The open area (22) is connected to the outside of the internal cavity of the housing (20) through an exhaust channel.
2. The arc-extinguishing structure as described in claim 1, wherein, The reflux zone (21) and the open zone (22) are separated by a partition wall (23) on the housing (20).
3. The arc-extinguishing structure as described in claim 2, wherein, The housing (20) includes a first half-shell (24) and a second half-shell (25) located on both sides of the arc-extinguishing chamber (10), and the partition wall (23) is formed by joining a first half-wall extending from the first half-shell (24) and a second half-wall extending from the second half-shell (25).
4. The arc-extinguishing structure as described in claim 1, wherein, The volume of the reflux region (21) is larger than the volume of the open region (22).
5. The arc-extinguishing structure as described in claim 1, wherein, The arc-extinguishing chamber (10) further includes a first insulating side plate (12) and a second insulating side plate (13) that hold the plurality of arc-extinguishing plates (11) on both sides.
6. The arc-extinguishing structure as described in claim 5, wherein, The rear end of the arc-extinguishing chamber (10), the first insulating side plate (12), and the second insulating side plate (13) are all spaced apart from the inner wall of the housing. At the rear end of the arc-extinguishing chamber (10), the housing (20) does not have an airflow outlet, so that the airflow ejected from the rear end of the arc-extinguishing chamber (10) flows into the first channel (28) between the first insulating side plate (12) and the inner wall of the housing and the second channel (29) between the second insulating side plate (13) and the inner wall of the housing.
7. The arc-extinguishing structure as described in claim 6, wherein, The arc-extinguishing structure includes a first gas-generating plate (14) and a second gas-generating plate (15) arranged in parallel, with an airflow nozzle formed between the first gas-generating plate (14) and the second gas-generating plate (15) for guiding the airflow into the arc-extinguishing chamber (10).
8. The arc-extinguishing structure as described in claim 7, wherein, The exhaust passage includes a first exhaust passage (30) and a second exhaust passage (31), and in the open area (22), the first passage (28) leads to the outside of the internal cavity via the first exhaust passage (30), and the second passage (29) leads to the outside of the internal cavity via the second exhaust passage (31).
9. The arc-extinguishing structure as described in claim 8, wherein, The first exhaust passage (30) is formed between the inner wall of the housing and the first gas-generating plate (14), and the second exhaust passage (31) is formed between the inner wall of the housing and the second gas-generating plate (15).
10. The arc-extinguishing structure as described in claim 8, wherein, The first exhaust channel (30) is formed by the docking of the first groove (241) on the inner wall of the housing and the first corresponding groove (141) on the first gas generating plate (14), and the second exhaust channel (31) is formed by the docking of the second groove on the inner wall of the housing and the second corresponding groove on the second gas generating plate (15).
11. The arc-extinguishing structure as described in claim 7, wherein, The first exhaust passage (30) and the second exhaust passage (31) are respectively opened on the first side wall (26) and the second side wall (27) of the housing (20) located on both sides of the arc-extinguishing chamber (10).
12. The arc-extinguishing structure as described in claim 7, wherein, In the recirculation zone (21), the arc-extinguishing structure includes a first recirculation inlet (33) for directing airflow from the first channel (28) into the arc-extinguishing chamber (10), and a second recirculation inlet (34) for directing airflow from the second channel (29) into the arc-extinguishing chamber (10).
13. The arc-extinguishing structure as described in claim 10, wherein, The first return inlet (33) is formed between the first gas generating plate (14) and the first insulating side plate (12), and the second return inlet (34) is formed between the second gas generating plate (15) and the second insulating side plate (13).
14. A circuit breaker comprising an arc-extinguishing structure as described in any one of claims 1 to 13.
15. The circuit breaker of claim 14, further comprising a stationary contact, wherein, The reflux zone (21) is closer to the stationary contact than the open zone (22).