Arc chute and circuit breaker comprising the same

Abstract

The present disclosure provides an arc chute for a circuit breaker, comprising: a plurality of arc runner blades forming an arc runner blade stack; a first support plate and a second support plate for supporting the arc runner blade stack; the first support plate comprising a plurality of first tabs along parallel to the plurality of arc runner blades, and the second support plate comprising a plurality of second tabs along parallel to the plurality of arc runner blades. At least one arc runner blade is located between two first tabs adjacent to the first support plate on a side of the first support plate and between two second tabs adjacent to the second support plate on a side of the second support plate, and the first tabs and the second tabs are arranged in pairs and protrude oppositely to each other to form a gas flow channel. The present disclosure also provides a circuit breaker comprising the arc chute as above. The arc chute according to the present disclosure improves the path of gas flow, forms a one-way flow of gas, and accelerates the extinction of the arc, greatly improving the breaking capacity of the circuit breaker, especially for high current products.

Description

Technical Field

[0001] This disclosure provides an arc-extinguishing chamber for a circuit breaker and a circuit breaker including the arc-extinguishing chamber. Background Technology

[0002] Circuit breakers are commonly used in various equipment and circuits. When the moving and stationary contacts of a circuit breaker transition from a contact state to a disconnected state, an electric arc can form between them. Therefore, there is a need to extinguish this arc in circuit breakers.

[0003] Common arc extinguishing methods include generating arc-extinguishing gas to blow the arc into the arc-extinguishing chamber of the circuit breaker, and then expelling it from the circuit breaker's exhaust port, thereby preventing the arc from burning for a long time and causing damage to the circuit breaker. Utility Model Content

[0004] In response to the problems and needs mentioned above, this disclosure proposes a novel technical solution that solves the aforementioned problems and brings about other technical effects by adopting the following technical features.

[0005] This disclosure discloses an arc-extinguishing chamber for a circuit breaker, comprising: a plurality of arc-extinguishing grids arranged parallel to each other and spaced apart to form an arc-extinguishing grid stack; a first support plate and a second support plate respectively disposed on both sides of the arc-extinguishing grid stack to support the arc-extinguishing grid stack; wherein, the first support plate includes a plate body and a plurality of first protrusions protruding from the side of the plate body facing the arc-extinguishing grid stack in a direction parallel to the plurality of arc-extinguishing grids, and the second support plate includes a plate body and a plurality of second protrusions protruding from the side of the plate body facing the arc-extinguishing grid stack in a direction parallel to the plurality of arc-extinguishing grids, such that at least one of the plurality of arc-extinguishing grids is located between two adjacent first protrusions on one side of the first support plate and between two adjacent second protrusions on one side of the second support plate, wherein the first protrusions and second protrusions on at least one side of the at least one arc-extinguishing grid are arranged in pairs and protrude relative to each other to form an airflow channel between each pair of first protrusions and second protrusions.

[0006] Preferably, in each pair of first and second protrusions, there is at least a minimum distance between the corresponding edges of the first and second protrusions, the minimum distance being the minimum width g of the airflow channel.

[0007] Preferably, the minimum width g of the airflow channel is 1 / 5 to 1 / 3 of the minimum distance G between the main body of the first support plate and the main body of the second support plate.

[0008] Preferably, each pair of first tabs and second tabs forms a gas inlet channel on the side where the minimum width g enters, and the inlet width of the gas inlet channel is greater than the minimum width g.

[0009] Preferably, each pair of first tabs and second tabs forms a gas discharge channel on the side where the minimum width g is gas discharged, and the outlet width of the gas discharge channel is greater than the minimum width g.

[0010] Preferably, each arc-extinguishing grid has a height, and the projection of the minimum width g of the airflow channel onto the height is located in the middle region of the height, and the middle region occupies 1 / 4 to 1 / 2 of the height.

[0011] Preferably, the projection of the minimum width g of the airflow channel onto the height is located below the midpoint of the height.

[0012] Preferably, in each pair of first and second protrusions, the minimum width g is formed between a first point on the first protrusion and a second point on the second protrusion, and the line connecting the first points on the plurality of first protrusions is inclined relative to the at least one arc-extinguishing grid plate, and the line connecting the second points on the plurality of second protrusions is inclined relative to the at least one arc-extinguishing grid plate.

[0013] Preferably, a plurality of first connecting portions are formed between the plurality of first protrusions and the first support plate, and the lengths of the plurality of first connecting portions are equal or gradually decrease along the stacking direction of the plurality of arc-extinguishing grids; and / or a plurality of second connecting portions are formed between the plurality of second protrusions and the first support plate, and the lengths of the second plurality of connecting portions are equal or gradually decrease along the stacking direction of the plurality of arc-extinguishing grids.

[0014] Preferably, the plurality of arc-extinguishing grids have recesses that face downwards.

[0015] Preferably, the plurality of first protrusions are formed as rectangular, triangular, trapezoidal, or arc-shaped protrusions; and / or the plurality of second protrusions are formed as rectangular, triangular, trapezoidal, or arc-shaped protrusions.

[0016] Preferably, the first support plate includes a groove formed between adjacent first protrusions, and the at least one arc-extinguishing grid includes a flange inserted into the groove; and the second support plate includes a groove formed between adjacent second protrusions, and the at least one arc-extinguishing grid includes a flange inserted into the groove.

[0017] Preferably, each pair of first tabs and second tabs are arranged symmetrically to each other.

[0018] Preferably, the at least one arc-extinguishing grid plate is held by the two adjacent first protrusions and by the two adjacent second protrusions.

[0019] This disclosure also proposes a circuit breaker that includes an arc-extinguishing chamber as described above.

[0020] The arc-extinguishing chamber disclosed herein improves the gas flow path, forming a unidirectional gas flow and accelerating the extinguishing of the arc, thereby greatly improving the breaking capacity of the circuit breaker, especially for high-current circuit breakers. Attached Figure Description

[0021] Figure 1-2 A schematic diagram of an arc-extinguishing chamber according to a preferred embodiment of the present disclosure is shown;

[0022] Figure 3-4 A schematic diagram of a circuit breaker according to a preferred embodiment of the present disclosure is shown;

[0023] Figure 5 Different forms of tabs on the support plate are shown;

[0024] Figure 6 A schematic diagram of the first support plate is shown;

[0025] Figure 7 A schematic diagram of an arc-extinguishing chamber is shown. Detailed Implementation

[0026] 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.

[0027] 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.

[0028] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by those skilled 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. Where the number of components is not specified, the number of components may be one or more; similarly, terms such as “a,” “the,” and “described” 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 after the word and its equivalents, without excluding other elements or objects. Terms such as “install,” “set,” “connect,” or “link” are not limited to physical or mechanical installation, setting, or connection, but may include electrical installation, setting, or connection, whether direct or indirect. Terms such as “upper,” “lower,” “left,” “right,” “high,” and “lower” are used only to indicate the relative positional relationship of the equipment during use or as shown in the accompanying drawings; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] As mentioned earlier, circuit breakers typically need to extinguish the arc formed between the moving and stationary contacts. The increasing number of high-current (e.g., above 50kA) electrical products places more stringent demands on the breaking capacity of circuit breakers. Therefore, for such products, it is desirable for the circuit breaker to ensure that the arc enters the arc-extinguishing chamber quickly and is extinguished as soon as possible.

[0030] Figure 7 An arc-extinguishing chamber is shown, comprising multiple arc-extinguishing grids arranged parallel to each other and insulating plates supporting the grids on both sides. However, the design of this arc-extinguishing chamber structure is flawed, leading to arc movement, excessively long arc burning time, and excessive arc energy, which can cause breaking failure or even burn out the product in severe cases. Research has found that the reason for the unsatisfactory performance of this arc-extinguishing chamber is that the arc formed above the arc-extinguishing chamber and the high-temperature, high-pressure gas (also known as the "mixed gas") cannot pass through the arc-extinguishing chamber quickly and smoothly, causing the mixed gas to move, linger, and even backflow around and within the arc-extinguishing chamber.

[0031] Therefore, this disclosure proposes an arc-extinguishing chamber for a circuit breaker to ensure that the mixed gas can smoothly and quickly enter and exit the arc-extinguishing chamber.

[0032] Figure 1 and 2 An arc-extinguishing chamber according to a preferred embodiment of the present disclosure is shown. Figure 3 and 4 A schematic diagram of the circuit breaker 3, including the arc-extinguishing chamber, is further shown. Figure 3 and 4In the preferred embodiment shown, the circuit breaker 3 further includes moving and stationary contacts 4 and two arc-extinguishing chambers on either side of the moving and stationary contacts 3. These two arc-extinguishing chambers may have substantially the same structure. It should be understood that other types of circuit breakers may also include a single arc-extinguishing chamber.

[0033] Specifically, the arc-extinguishing chamber includes: a plurality of arc-extinguishing grid plates 1, arranged parallel to each other and spaced apart to form an arc-extinguishing grid plate stack 10; a first support plate 21 and a second support plate 22, respectively disposed on both sides of the arc-extinguishing grid plate stack 10 to support the arc-extinguishing grid plate stack 10. The arc-extinguishing grid plates 1 are typically made of conductive material, and the first support plate 21 and the second support plate 22 are typically made of insulating material.

[0034] Furthermore, the first support plate 21 includes a plate body and a plurality of first protrusions 210 protruding from the side of the plate body facing the arc-extinguishing grid stack 10 in a direction parallel to the plurality of arc-extinguishing grids 1. The second support plate 22 includes a plate body and a plurality of second protrusions 220 protruding from the side of the plate body facing the arc-extinguishing grid stack 10 in a direction parallel to the plurality of arc-extinguishing grids 1, such that at least one of the plurality of arc-extinguishing grids 1 is located between two adjacent first protrusions 210 on one side of the first support plate 21 and between two adjacent second protrusions 220 on one side of the second support plate 22. Moreover, the first protrusions 210 and second protrusions 220 on at least one side of at least one arc-extinguishing grid are arranged in pairs and protrude relative to each other to form an airflow channel between each pair of first protrusions 210 and second protrusions 220.

[0035] and Figure 7 Compared to the arc-extinguishing chamber shown in the previous disclosure, which is supported only by two planar support plates, the arc-extinguishing chamber according to this disclosure forms multiple airflow channels through paired protrusions extending from the two support plates and adjacent arc-extinguishing plates. Therefore, when the moving and stationary contacts break and generate an arc, the high-temperature, high-pressure mixed gas formed above the arc-extinguishing chamber moves rapidly towards these airflow channels and enters the low-temperature, low-pressure exhaust region below the arc-extinguishing chamber after passing through these channels. Furthermore, after the mixed gas leaves the airflow channels and enters the exhaust region, it is difficult for it to return to the top of the arc-extinguishing chamber through the airflow channels; instead, it is smoothly discharged from the exhaust port 32 of the circuit breaker 3. Figure 4 As indicated by the black arrow in the diagram. Therefore, the arc-extinguishing chamber according to this disclosure improves the gas flow path, forms a unidirectional gas flow, and accelerates the extinction of the arc, thereby greatly improving the breaking capacity of the circuit breaker, especially for high-current circuit breakers.

[0036] It should be understood that the plurality of first tabs 210 and the plurality of second tabs 220 can have various forms. Figure 1-4In the preferred embodiment shown in Figures 6 and 7, each of the plurality of first protrusions 210 and the plurality of second protrusions 220 is formed into a triangular shape of substantially the same size. Preferably, the corners of the triangular protrusions can be rounded. According to other embodiments, the plurality of first protrusions 210 can be generally formed into rectangular, trapezoidal, or arc-shaped protrusions. The plurality of second protrusions 220 can also be generally formed into rectangular, trapezoidal, or arc-shaped protrusions. Figure 5 The first tabs 210a, 210b, 210c and the second tabs 220a, 220b, 220c are shown schematically.

[0037] Preferably, in various embodiments, each pair of first tabs 210 and second tabs 220 may also be arranged symmetrically to each other.

[0038] Preferably, regardless of the specific shape of the first tab 210 and the second tab 220, in each pair of first tabs 210 and second tabs 220, there is at least a minimum distance between the corresponding edges of the first tab 210 and the second tab 220 (for example, this minimum distance is formed on...). Figure 2 The minimum distance is between the vertices C1 and C2 of the triangular protrusion in the airflow channel, and the minimum distance is the minimum width g of the airflow channel.

[0039] Furthermore, although in the preferred embodiment shown in the accompanying drawings, the main bodies of the first support plate 21 and the second support plate 22 are formed as flat plates and arranged parallel to each other, it is also possible, if necessary, for the first support plate and the second support plate to be arranged at an angle to each other, so that along the direction of the stacking of the arc-extinguishing grid sheets, the gap between the first support plate and the second insulation is formed to be wider at one end and narrower at the other end. Regardless of how the first support plate and the second support plate are arranged, there is a minimum gap between them. Figure 1 In the embodiment shown, there is a uniform minimum distance G between the first support plate 21 and the second support plate 22.

[0040] Therefore, for various forms of protrusions and support plates arranged in various ways, this disclosure further proposes that the minimum width g of the airflow channel, as described above, is 1 / 5 to 1 / 3 of the minimum distance G between the main body of the first support plate and the main body of the second support plate. This arrangement of the first and second protrusions ensures that the mixed gas smoothly enters and passes through the minimum distance between them, preventing the mixed gas from shifting or flowing back due to excessive channel width, and also preventing the mixed gas from being unable to pass quickly due to insufficient channel width.

[0041] More preferably, refer to Figure 1 The airflow direction from top to bottom, indicated by the middle arrow W, is such that each pair of first tabs 210 and second tabs 220 are on the side where the gas enters at the minimum width g. Figure 1A gas introduction channel 8 is formed on the upper side of the minimum width g, and the inlet width of the gas introduction channel 8 is greater than the minimum width g. That is, in Figure 1 In the preferred embodiment shown, the triangular first and second protrusions form the gas inlet channel 8 in a generally funnel shape. In contrast, among the various protrusion shapes described above, rectangular protrusions are less preferred, while triangular, arc-shaped, or trapezoidal protrusions can all form this gas inlet channel with a wide inlet and narrow outlet. This funnel-shaped gas inlet channel 8 can more stably and comprehensively receive and guide the mixed gas above the arc-extinguishing chamber, and facilitates the smooth flow of the mixed gas through it.

[0042] Preferably, each pair of first tabs 210 and second tabs 220 are located on the side where the gas is discharged at the minimum width g ( Figure 1 A gas discharge channel 9 is formed on the lower side of the circuit breaker 3, and the outlet width of the gas discharge channel 9 is greater than the minimum width g. Therefore, the gas discharge channel 9 is also formed in a funnel shape, which facilitates the rapid cooling of the mixed gas entering the gas discharge channel 9 and its rapid discharge through the exhaust port 32 of the circuit breaker 3.

[0043] Preferably, such as Figure 1 As shown, the multiple arc-extinguishing grid plates 1 may also have recesses 11 that face downwards. These recesses 11 can guide the mixed gas to flow rapidly through the arc-extinguishing chamber.

[0044] Preferably, such as Figure 2 As shown, each arc-extinguishing grid 1 has a height L, and the projection of the minimum width g of the airflow channel onto the height L is located in the middle region of the height L (as shown by the dashed ellipse), and the middle region occupies 1 / 4 to 1 / 2 of the height L. More preferably, the projection of the minimum width g of the airflow channel onto the height L is located below the midpoint M of the height L.

[0045] Specifically, Figure 2 The preferred embodiment shows the height L of the arc-extinguishing grid plate 1 at the foremost point of the drawing and the vertices C1 and C2 of the triangular protrusions forming the minimum width g between the first protrusion 210 and the second protrusion 220. The projections of vertices C1 and C2 along the direction of the dashed line in the drawing onto the height L overlap and fall into the middle region (or middle segment) of the height L shown by the dashed ellipse, and are below the midpoint M. In this embodiment, the middle region is approximately 1 / 2 of the height L.

[0046] This structural design helps optimize the position of the minimum width g of the airflow channel relative to the arc-extinguishing grid, thereby optimizing the positions of the gas inlet channel and gas outlet channel as described above, ensuring that the mixed gas passes through the arc-extinguishing chamber more smoothly and quickly.

[0047] According to a preferred embodiment of this disclosure, see [link to preferred embodiment]. Figure 6 The line A connecting vertices C1 on multiple first protrusions 210 is relative to the arc-extinguishing grid 1 ( Figure 6 (not shown in the image) tilted, thus having Figure 6 The gas inlet channel 8 on the right side of the arc-extinguishing chamber in the structure shown is relatively large. Although not shown, the line connecting the vertices C2 on the multiple second protrusions 220 is also inclined relative to the arc-extinguishing grid 1.

[0048] An arc-extinguishing chamber with this structure can, as Figure 3 and 4 As shown, this arrangement is applied in circuit breaker 3, such that the side of the arc-extinguishing chamber with the relatively large gas inlet channel 8 is closer to the moving and stationary contacts 4. Since the temperature and pressure of the mixed gas generated are higher the closer it is to the moving and stationary contacts 4 when they break, setting the side of the arc-extinguishing chamber with the relatively large gas inlet channel 8 closer to the moving and stationary contacts 4 allows the high-temperature and high-pressure mixed gas from the moving and stationary contacts 4 to enter the arc-extinguishing chamber smoothly and quickly.

[0049] In addition, see Figure 3-4 The circuit breaker 3 shown is Figure 6 The first support plate 21 shown has a region on its right side (i.e., the side closer to the moving and stationary contacts 4 mentioned above) where the first support plate 21 does not form the first protrusion 210 (e.g., Figure 6 (As shown by the dashed ellipse). Similarly, the second support plate 22 also has an area where the second protrusion 220 is not formed (not shown). In this preferred embodiment, some arc-extinguishing grids 1 are not disposed between any protrusions. This structure can further reduce the obstruction effect on the mixed gas, that is, on the side closer to the moving and stationary contacts 4, the high-temperature and high-pressure mixed gas will enter the area without protrusions more quickly and be discharged through the arc-extinguishing chamber.

[0050] Preferably, such as Figure 3 and 4As shown, the circuit breaker 3 has a flat bottom surface 31 perpendicular to the first support plate 21 and the second support plate 22. Multiple arc-extinguishing grid plates 1 in the arc-extinguishing grid plate stack 10 are arranged perpendicular to the flat bottom surface 31. The arc-extinguishing grid plate stack 10 has a first end 101 near the moving and stationary contacts 4 and a second end 102 away from the moving and stationary contacts 4, with the first end 101 closer to the flat bottom surface 31 than the second end 102. In other words, the arc-extinguishing grid plate stack 10 is arranged in the circuit breaker 3 with one end higher than the other. This arrangement provides a larger space between the arc-extinguishing grid plates and the moving and stationary contacts 4 on the side near the moving and stationary contacts 4, allowing the high-temperature, high-pressure mixed gas near the moving and stationary contacts 4 to smoothly and quickly enter the arc-extinguishing chamber. On the side away from the moving and stationary contacts 4, a larger space exists between the arc-extinguishing grid plates and the flat bottom surface 31, allowing the mixed gas that has passed through the arc-extinguishing chamber to quickly cool and depressurize, and smoothly exit from the exhaust port 32.

[0051] In addition, according to Figure 1 In the preferred embodiment shown, a plurality of first protrusions 210 form a plurality of first connecting portions 212 between the plurality of first protrusions 210 and the first support plate 21, and the lengths of the plurality of first connecting portions may be equal. Similarly, a plurality of second protrusions 220 form a plurality of second connecting portions 222 between the plurality of second protrusions 220 and the first support plate 22, and the lengths of the plurality of second connecting portions are equal.

[0052] Alternatively, according to another preferred embodiment (not shown), the lengths of the plurality of first connecting portions gradually decrease along the stacking direction of the plurality of arc-extinguishing grid plates, and the lengths of the plurality of second connecting portions also gradually decrease along the stacking direction of the plurality of arc-extinguishing grid plates. When the plurality of first protrusions and the plurality of second protrusions are also considered as stacked bodies, when the lengths of the first connecting portions and the second connecting portions are set to gradually decrease along the stacking direction of the plurality of arc-extinguishing grid plates, such a stacked body has a roughly pyramidal shape. This structure allows one end of the entire arc-extinguishing chamber to have a larger airflow channel. Furthermore, the end with the larger airflow channel can be located near the moving and stationary contacts 4, thereby facilitating the smooth and rapid entry of the high-temperature, high-pressure mixed gas into the arc-extinguishing chamber.

[0053] Preferably, the first support plate 21 may include a groove (not shown) formed between adjacent first protrusions 210, and the arc-extinguishing grid 1 includes a flange (not shown) inserted into the groove. Similarly, the second support plate 22 may include a groove 221 formed between adjacent second protrusions 220, and the arc-extinguishing grid 1 includes a flange 121 inserted into the groove 221, such as... Figure 2 As shown, the arc-extinguishing grid plate can be effectively supported between the first and second support plates through the interlocking fit between the groove and the flange.

[0054] Furthermore, the arc-extinguishing grid 1 can also be clamped by two adjacent first protrusions 210 and by two adjacent second protrusions 220. In other words, the arc-extinguishing grid 1 can be interference-fitted with the first and second protrusions on both sides, thereby omitting the grooves and protrusions as described above for these arc-extinguishing grids. Of course, the arc-extinguishing grid can also be simultaneously clamped by protrusions and fitted with grooves and protrusions, thereby further improving the strength and stability of the entire arc-extinguishing chamber.

[0055] The exemplary embodiments of this disclosure have 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 chamber for a circuit breaker, characterized in that, include: Multiple arc-extinguishing grids (1) are arranged parallel to each other and spaced apart to form an arc-extinguishing grid stack (10). The first support plate (21) and the second support plate (22) are respectively disposed on both sides of the arc extinguishing grid stack (10) to support the arc extinguishing grid stack (10). The first support plate (21) includes a plate body and a plurality of first protrusions (210) protruding from the side of the plate body facing the arc-extinguishing grid stack (10) in a direction parallel to the plurality of arc-extinguishing grids (1). The second support plate (22) includes a plate body and a plurality of second protrusions (220) protruding from the side of the plate body facing the arc-extinguishing grid stack (10) in a direction parallel to the plurality of arc-extinguishing grids (1), such that at least one of the plurality of arc-extinguishing grids (1) is located between two adjacent first protrusions (210) on one side of the first support plate (21) and between two adjacent second protrusions (220) on one side of the second support plate (22). In this configuration, a first tab (210) and a second tab (220) on at least one side of the at least one arc-extinguishing grid are arranged in pairs and protrude relative to each other to form an airflow channel between each pair of first tabs (210) and second tabs (220).

2. The arc-extinguishing chamber for a circuit breaker as described in claim 1, characterized in that, In each pair of first tabs (210) and second tabs (220), there is at least a minimum distance between the corresponding edges of the first tab (210) and the second tab (220), the minimum distance being the minimum width g of the airflow channel.

3. The arc-extinguishing chamber for a circuit breaker as described in claim 2, characterized in that, The minimum width g of the airflow channel is 1 / 5 to 1 / 3 of the minimum distance G between the main body of the first support plate (21) and the main body of the second support plate (22).

4. The arc-extinguishing chamber for a circuit breaker as described in claim 2, characterized in that, Each pair of first tabs (210) and second tabs (220) forms a gas inlet channel (8) on the side where the minimum width g enters, and the inlet width of the gas inlet channel (8) is greater than the minimum width g.

5. The arc-extinguishing chamber for a circuit breaker as described in claim 2, characterized in that, Each pair of first tabs (210) and second tabs (220) forms a gas discharge channel (9) on the side of the gas discharge with the minimum width g, and the outlet width of the gas discharge channel (9) is greater than the minimum width g.

6. The arc-extinguishing chamber for a circuit breaker as described in claim 2, characterized in that, Each arc-extinguishing grid (1) has a height (L), and the projection of the minimum width g of the airflow channel onto the height (L) is located in the middle region of the height (L), and the middle region occupies 1 / 4 to 1 / 2 of the height (L).

7. The arc-extinguishing chamber for a circuit breaker as described in claim 6, characterized in that, The projection of the minimum width g of the airflow channel onto the height (L) is located below the midpoint (M) of the height (L).

8. The arc-extinguishing chamber for a circuit breaker as described in claim 2, characterized in that, In each pair of first tabs (210) and second tabs (220), the minimum width g is formed between a first point (C1) on the first tab (210) and a second point (C2) on the second tab (220), and the line (A) connecting the first points (C1) on the plurality of first tabs (210) is inclined relative to the at least one arc-extinguishing grid, and the line connecting the second points (C2) on the plurality of second tabs (220) is inclined relative to the at least one arc-extinguishing grid.

9. The arc-extinguishing chamber for a circuit breaker as described in claim 1, characterized in that, The plurality of first protrusions (210) form a plurality of first connecting portions with the first support plate (21), and the lengths of the plurality of first connecting portions are equal or gradually decrease along the stacking direction of the plurality of arc-extinguishing grid plates; and / or Multiple second connecting portions are formed between the multiple second protrusions (220) and the first support plate (22), and the lengths of the multiple second connecting portions are equal or gradually decrease along the stacking direction of the multiple arc-extinguishing grid plates.

10. The arc-extinguishing chamber for a circuit breaker as described in claim 1, characterized in that, The plurality of arc-extinguishing grids (1) have recesses (11) that are recessed downwards.

11. The arc-extinguishing chamber for a circuit breaker as described in claim 1, characterized in that, The plurality of first protrusions (210) are formed as rectangular, triangular, trapezoidal, or arc-shaped protrusions; and / or The plurality of second tabs (220) are formed as rectangular, triangular, trapezoidal or arc-shaped tabs.

12. The arc-extinguishing chamber for a circuit breaker as described in claim 1, characterized in that, The first support plate (21) includes a groove formed between adjacent first tabs (210), and the at least one arc-quenching grid (1) includes a flange inserted into the groove; and The second support plate (22) includes a groove (221) formed between adjacent second protrusions (220), and the at least one arc-extinguishing grid plate (1) includes a flange (121) inserted into the groove (221).

13. The arc-extinguishing chamber for a circuit breaker as described in any one of claims 1-12, characterized in that, Each pair of first tabs (210) and second tabs (220) are arranged symmetrically to each other.

14. The arc-extinguishing chamber for a circuit breaker as described in any one of claims 1-12, characterized in that, The at least one arc-extinguishing grid plate (1) is held by the two adjacent first protrusions (210) and by the two adjacent second protrusions (220).

15. A circuit breaker (3), characterized in that, Includes the arc-extinguishing chamber as described in any one of claims 1-14.

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