Arc extinguishing structure of a contact system and circuit breaker

Abstract

The utility model relates to a circuit breaker technical field especially is related to a contact system's arc extinguishing structure and circuit breaker. The utility model provides contact system's arc extinguishing structure includes: arc extinguishing chamber, dynamic arc starting piece, first gas production spare and second gas production spare, and contact system includes short dynamic contact; Arc extinguishing chamber is provided with a plurality of arc extinguishing louver that arranges in proper order, dynamic arc starting piece includes at least one first dynamic arc starting board, and the first dynamic arc starting board includes first end, first arc starting part and first intermediate connecting portion, and first arc starting part is V type and includes first section and second section, and first section is connected with first intermediate connecting portion, and second section corresponds with short dynamic contact and cooperates; The width of second section is greater than the width of first intermediate connecting portion. Can make current density increase, and arc root magnetic blowing force strengthens, and arc root is convenient for shift, and gas space increases between arc extinguishing louver, forms backflow airway, avoids air current rebound and vortex.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to an arc-extinguishing structure for a contact system and a circuit breaker. Background Technology

[0002] The existing short-contact arc-extinguishing chamber structure has a constant cross-section moving arc-initiating plate to match the short-contact system. The arc transfer at the moving end of this structure is not smooth, mainly due to the following reasons: First, the current density is low and the magnetic blowing force is weak; second, the return air passage is blocked, forming eddies, which is not conducive to the transfer of the arc to the moving arc-initiating plate; third, due to the size limitation of the moving arc-initiating plate, the gas-generating component cannot form a narrow slit, resulting in poor air blowing effect. Utility Model Content

[0003] The purpose of this utility model is to provide an arc-extinguishing structure and circuit breaker for a contact system, so as to solve the technical problem of uneven arc transfer in the moving arc-starting plate of the existing contact system with short contact pieces.

[0004] In a first aspect, this utility model provides an arc-extinguishing structure for a contact system, the arc-extinguishing structure comprising: an arc-extinguishing chamber, a moving arc-initiating element, a first gas-generating element, and a second gas-generating element, the contact system comprising a short moving contact and a stationary contact; The arc-extinguishing chamber is provided with a plurality of arc-extinguishing grid plates arranged in sequence. Each arc-extinguishing grid plate includes a base, and the first gas-generating element and the second gas-generating element are respectively located on both sides of the base. The movable arc-starting component includes at least one first movable arc-starting plate. Along the length direction of the first movable arc-starting plate, the first movable arc-starting plate includes a first end portion located at one end of the first movable arc-starting plate, a first arc-starting portion located at the other end of the first movable arc-starting plate, and a first intermediate connecting portion located between the two ends of the first movable arc-starting plate. The first end portion is located at one end of the arc-extinguishing chamber along the arrangement direction of the arc-extinguishing grid plates and corresponds to the base. The first arc-starting portion is V-shaped and includes a first segment and a second segment. The first segment is connected to the first intermediate connecting portion, and the second segment corresponds to and cooperates with the short movable contact. Along the width direction of the first moving arc-guiding plate, the width of the second segment is greater than the width of the first intermediate connecting portion.

[0005] In an optional embodiment, the moving arc-initiating element further includes a second moving arc-initiating plate, and the contact system further includes a long moving contact, which is located in the middle of the short moving contact and protrudes from the short moving contact; Along the length of the second movable arc-initiating plate, the second movable arc-initiating plate includes a second end portion located at one end of the second movable arc-initiating plate, a second arc-initiating portion located at the other end of the second movable arc-initiating plate, and a second intermediate connecting portion located between the two ends of the second movable arc-initiating plate. The second end portion is located at one end of the arc-extinguishing chamber along the arrangement direction of the arc-extinguishing grid plates and corresponds to the base portion. The second arc-initiating portion is bent toward or away from the stationary contact relative to the second intermediate connecting portion and corresponds to and cooperates with the long movable contact. The movable arc-starting component includes two first movable arc-starting plates and one second movable arc-starting plate, with the second movable arc-starting plate located between the two first movable arc-starting plates.

[0006] In an optional embodiment, the second arc-leading portion is V-shaped and includes a third segment and a fourth segment, wherein the third segment is connected to the second intermediate connecting portion and the fourth segment is correspondingly engaged with the long moving contact.

[0007] In an optional embodiment, the first intermediate connecting portion is located between the first gas generating component and the second gas generating component, and the second segment is located outside the first gas generating component and the second gas generating component.

[0008] In an optional embodiment, the first ends of the two first moving arc-starting plates are connected or integrally formed, or the second end of the second moving arc-starting plate is connected or integrally formed with the first end of at least one of the two first moving arc-starting plates. and / or; The second segment of the two first moving arc-inducing plates is connected to the end away from the first segment or is integrally formed.

[0009] In an optional embodiment, the width of the second moving arc-inducing plate is greater than or equal to the width of the long moving contact.

[0010] In an optional embodiment, the width of the second segment of the moving arc-drawing member is greater than or equal to the width of the short moving contact.

[0011] In an optional embodiment, the width of the first end portion is greater than the width of the first intermediate connecting portion.

[0012] In an optional embodiment, the first gas-generating element has a chamfer on the side near the short-acting contact; and / or; The second gas-generating component has a chamfer on the side near the short moving contact.

[0013] In an optional embodiment, the short moving contact includes a short moving contact piece, and the long moving contact includes a long moving contact piece; The number of long moving contacts in the long moving contact is less than or equal to the number of short moving contacts in the short moving contacts on each side of the long moving contact.

[0014] In an optional embodiment, two partitions are further included, which are disposed opposite to each other between the first gas generating element and the second gas generating element; The second moving arc-inducing plate is disposed in the gap between the two partitions; The first intermediate connecting portion of one of the first moving arc-initiating plates is located in the gap between one of the partitions and the first gas-generating component, and the second segment is located outside the first gas-generating component; the first intermediate connecting portion of another first moving arc-initiating plate is located in the gap between another partition and the second gas-generating component, and the second segment is located outside the second gas-generating component.

[0015] In an optional embodiment, the first moving arc-initiating plate is located outside the first gas-generating component and the second gas-generating component, and the second arc-initiating portion is located between the first gas-generating component and the second gas-generating component.

[0016] In an optional embodiment, the V-shaped opening of the first arc-leading portion is away from the stationary contact.

[0017] In an optional embodiment, the V-shaped opening of the second arc-leading portion is away from the stationary contact.

[0018] Secondly, this utility model provides a circuit breaker, including the arc-extinguishing structure of the contact system described in any of the foregoing embodiments.

[0019] Compared with the prior art, the technical advantages of the arc-extinguishing structure of the contact system and the circuit breaker provided by this utility model are as follows: The arc-extinguishing structure of the contact system provided by this utility model includes: an arc-extinguishing chamber, a moving arc-initiating element, a first gas-generating element, and a second gas-generating element. The contact system includes a short moving contact and a stationary contact. The arc-extinguishing chamber is provided with a plurality of arc-extinguishing grids arranged in sequence. Each arc-extinguishing grid includes a base. The first gas-generating element and the second gas-generating element are respectively located on both sides of the base. The moving arc-initiating element includes at least one first moving arc-initiating plate. Along the length direction of the first moving arc-initiating plate, the first moving arc-initiating plate includes a first end portion located at one end of the first moving arc-initiating plate, a first arc-initiating portion located at the other end of the first moving arc-initiating plate, and a first intermediate connecting portion located between the two ends of the first moving arc-initiating plate. The first end portion is located at one end of the arc-extinguishing chamber along the arrangement direction of the arc-extinguishing grids and corresponds to the base. The first arc-initiating portion is V-shaped and includes a first segment and a second segment. The first segment is connected to the first intermediate connecting portion, and the second segment corresponds to and cooperates with the short moving contact. Along the width direction of the first moving arc-initiating plate, the width of the second segment is greater than the width of the first intermediate connecting portion.

[0020] Because the width of the first intermediate connecting part is narrower than that of the second section, the current density increases, the magnetic blowout force at the arc root is strengthened, facilitating the transfer of the moving arc root. Furthermore, the increased gas space between the first and second sections creates a return air channel, preventing airflow rebound and eddies. Since the width of the second section is greater than that of the first intermediate connecting part, when arcs ignite on both sides of the short moving contact in the width direction, the moving arc root can be smoothly transferred to the first moving arc-initiating plate in the wider second section, preventing continuous burning at the two edges in the width direction of the short moving contact. Because the first arc-initiating part is V-shaped, the current flow direction is reversed, which helps to increase the local magnetic field strength at the moving arc root and accelerates arc transfer.

[0021] The circuit breaker provided by this utility model includes the arc-extinguishing structure of the above-mentioned contact system. Therefore, the technical advantages and effects achieved by it include the technical advantages and effects achieved by the arc-extinguishing structure of the above-mentioned contact system, which will not be described in detail here.

[0022] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 A schematic diagram of the structure of the first moving arc-initiating plate, the short moving contact, and the arc-extinguishing chamber provided in this embodiment of the utility model; Figure 2 Provided for the embodiments of this utility model Figure 1 A sectional view; Figure 3 A schematic diagram of the first moving arc-inducing plate and the short moving contact cooperating structure provided in an embodiment of this utility model; Figure 4 A schematic diagram of the structure of the first gas-generating component provided in an embodiment of this utility model; Figure 5 A cross-sectional view of the integrated moving arc-initiating element, short moving contact, long moving contact, and arc-extinguishing chamber structure provided for embodiments of this utility model; Figure 6 A schematic diagram of the integrated moving arc-drawing component and its cooperation with the short moving contact and the long moving contact provided in the embodiment of this utility model; Figure 7 Side view of the integrated moving arc-drawing component and its mating structure with short and long moving contacts provided in this embodiment of the utility model; Figure 8 A schematic diagram of the integrated moving arc-guiding component structure provided for an embodiment of this utility model; Figure 9 A schematic diagram of one side of the installation position of the integrated moving arc-guiding component provided for an embodiment of this utility model; Figure 10 A schematic diagram of the other side of the installation position of the integrated moving arc-drawing component provided for an embodiment of this utility model; Figure 11 A schematic diagram showing the integrated moving arc-guiding component and the partition plate being installed in accordance with an embodiment of this utility model.

[0025] Icons: 1-Arc-extinguishing chamber; 2-Moving arc-starting component; 3-First gas-generating component; 4-Second gas-generating component; 5-Short moving contact; 6-Arc-extinguishing grid plate; 7-Base; 8-Leg; 9-First moving arc-starting plate; 10-First end; 11-First arc-starting section; 12-First intermediate connecting section; 13-First segment; 14-Second segment; 15-Long moving contact; 16-Second arc-starting section; 17-Second intermediate connecting section; 18-Third segment; 19-Fourth segment; 20-Static arc-starting component; 21-Chamfer; 22-Second moving arc-starting plate; 23-Baffle. Detailed Implementation

[0026] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0030] The present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0031] The specific structure is as follows: Figures 1 to 10 As shown.

[0032] This embodiment provides an arc-extinguishing structure for a contact system. The arc-extinguishing structure includes: an arc-extinguishing chamber 1, a moving arc-initiating element 2, a first gas-generating element 3, and a second gas-generating element 4. The contact system includes a short moving contact 5 and a stationary contact. The arc-extinguishing chamber 1 is provided with a plurality of arc-extinguishing grid plates 6 arranged in sequence. Each arc-extinguishing grid plate 6 includes a base 7 and a pair of spaced legs 8 located on both sides of the base 7. The first gas-generating element 3 and the second gas-generating element 4 respectively cover the pair of legs 8 of all the arc-extinguishing grid plates 6. The moving arc-initiating element 2 includes at least one first moving arc-initiating plate 9. Along the length direction of the first moving arc-initiating plate 9, the first moving arc-initiating plate 9 includes a gas-generating element located at the first moving arc-initiating plate 9. The first end portion 10 at one end, the first arc-inducing portion 11 at the other end of the first moving arc-inducing plate 9, and the first intermediate connecting portion 12 between the two ends of the first moving arc-inducing plate 9 are provided. The first end portion 10 is located at one end of the arc-extinguishing chamber 1 along the arrangement direction of the arc-extinguishing grid plates 6 and corresponds to the base portion 7. The first arc-inducing portion 11 is V-shaped and includes a first segment 13 and a second segment 14. The first segment 13 is connected to the first intermediate connecting portion 12, and the second segment 14 is correspondingly engaged with the short moving contact 5. Along the width direction of the first moving arc-inducing plate 9, the width of the first end portion 10 and the width of the second segment 14 are both greater than the width of the first intermediate connecting portion 12.

[0033] In this embodiment, when only one first moving arc-initiating plate 9 is provided, the first intermediate connecting part 12 is located between the first gas-generating element 3 and the second gas-generating element 4, and the second segment 14 is located outside the first gas-generating element 3 and the second gas-generating element 4. Since the width of the first intermediate connecting part 12 is narrower than that of the first end 10 and the second segment 14, the current density can be increased, the magnetic blowing force of the arc root can be strengthened, facilitating the transfer of the moving arc root, and the gas space between it and the arc-extinguishing grid plate 6 is increased, forming a return air channel and avoiding airflow rebound and eddies. Since the width of the second segment 14 is greater than the width of the first intermediate connecting part 12, when arcs are generated on both sides of the short moving contact 5 in the width direction, the moving arc root can be smoothly transferred to the first moving arc-initiating plate 9 in the wider second segment 14, preventing continuous burning at the two edges in the width direction of the short moving contact 5. Since the first arc-initiating part 11 is V-shaped, the current flow direction is reversed, which helps to increase the local magnetic field strength of the moving arc root and accelerate the arc transfer.

[0034] It should be noted that the arc-extinguishing grid plate 6 may also include only the base 7, in which case the first gas generating element 3 and the second gas generating element 4 are located on both sides of the base 7.

[0035] In this embodiment, the width of the first end portion 10 may not be greater than the width of the first intermediate connecting portion 12, depending on the actual needs.

[0036] In the optional technical solution of this embodiment, the moving arc-initiating component 2 further includes a second moving arc-initiating plate 22, and the contact system further includes a long moving contact 15, which is located in the middle of the short moving contact 5 and protrudes from the short moving contact 5; along the length direction of the second moving arc-initiating plate 22, the second moving arc-initiating plate 22 includes a second end located at one end of the second moving arc-initiating plate 22, a second arc-initiating portion 16 located at the other end of the second moving arc-initiating plate 22, and a second intermediate connecting portion 17 located between the two ends of the second moving arc-initiating plate 22. The second end is located at one end of the arc-extinguishing chamber 1 along the arrangement direction of the arc-extinguishing grid 6 and corresponds to the base 7. The second arc-initiating portion 16 is bent toward or away from the stationary contact relative to the second intermediate connecting portion 17 and corresponds to and cooperates with the long moving contact 15.

[0037] In existing technologies, conventional arc-extinguishing chambers 1 with long contact plates (also known as arc contacts, i.e., the long moving contact 15 of this application) are intentionally designed with a logic where the short contact plate (i.e., the short moving contact 5 of this application) separates first, followed by the long contact plate (i.e., there is a timing difference between the opening of the short and long contact plates). The purpose is to ensure that the arc only ignites on the long contact plate when the contacts open. However, actual design deviations result in the timing difference between the opening of the short and long contact plates being too small. As the voltage at the client increases, the short contact plate will ignite, and the conventional arc-ignition structure cannot connect the arc, causing the arc to be unable to enter the arc-extinguishing chamber 1, resulting in disconnection failure.

[0038] In this embodiment, in view of the problems existing in the prior art, the designed moving arc ignition device 2 also includes a second moving arc ignition plate 22. The first moving arc ignition plate 9 and the second moving arc ignition plate 22 respectively ignite the arc for the short moving contact 5 and the long moving contact 15. Since the first moving arc ignition plate 9 and the short moving contact 5 cooperate to effectively guide the arc into the arc extinguishing chamber 1, the breaking effect can be effectively guaranteed.

[0039] In the optional technical solution of this embodiment, the second arc-initiating part 16 is V-shaped and includes a third segment 18 and a fourth segment 19. The third segment 18 is connected to the second intermediate connecting part 17, and the fourth segment 19 corresponds to and cooperates with the long moving contact 15. This is beneficial to increase the local magnetic field strength at the root of the moving arc and accelerate the arc transfer.

[0040] In the optional technical solution of this embodiment, the moving arc-initiating component 2 includes two first moving arc-initiating plates 9 and one second moving arc-initiating plate 22, with the second moving arc-initiating plate 22 located between the two first moving arc-initiating plates 9. The overall design is compact and occupies little space. Figure 6 As shown, the first arc-initiating portion 11 of the two first moving arc-initiating plates 9 is V-shaped with the V-shaped opening facing away from the stationary contact, and the second arc-initiating portion 16 is V-shaped with the V-shaped opening facing the stationary contact. Preferably, the second arc-initiating portion 16 is V-shaped with the V-shaped opening facing away from the stationary contact.

[0041] In the optional technical solution of this embodiment, the first ends 10 of the two first moving arc-initiating plates 9 are connected or integrally formed; and / or, the second segments 14 of the two first moving arc-initiating plates 9, at the ends away from the first segments 13, are connected or integrally formed. This facilitates manufacturing and improves the arc-initiating effect.

[0042] In the optional technical solution of this embodiment, the second end of the second moving arc-initiating plate 22 is connected to or integrally formed with the first end 10 of at least one of the two first moving arc-initiating plates 9.

[0043] In this embodiment, the second end of the second movable arc-initiating plate 22 can be connected to or integrally formed with the first end 10 of any one of the two first movable arc-initiating plates 9. Preferably, the second end of the second movable arc-initiating plate 22 is connected to or integrally formed with the first end 10 of the two first movable arc-initiating plates 9, which is convenient to manufacture and has a good overall arc-initiating effect. Furthermore, the ends of the second segments 14 of the two first movable arc-initiating plates 9 that are away from the first segments 13 are connected to or integrally formed, and the first movable arc-initiating plates 9 and the second movable arc-initiating plate 22 form an integrated movable arc-initiating component 2.

[0044] In the optional technical solution of this embodiment, the short-moving contact 5 includes at least two short-moving contact pieces. Preferably, the width of the second segment 14 of the moving arc-inducing member 2 is greater than the width of the short-moving contact 5. And as... Figure 2 As shown, the first arc-leading part 11 is V-shaped and the V-shaped opening is away from the stationary contact.

[0045] In this embodiment, when the moving arc-initiating component 2 includes a first moving arc-initiating plate 9, the width of the second segment 14 of the moving arc-initiating plate is greater than the width of the short moving contact 5; when the moving arc-initiating component 2 includes two first moving arc-initiating plates 9, the width of the second segment 14 of the two moving arc-initiating plates is greater than the width of the short moving contact 5, effectively ensuring the arc-initiating effect.

[0046] In this embodiment, the long moving contact 15 includes at least one long moving contact piece, and the width of the second moving arc-initiating plate 22 is greater than or equal to the width of the long moving contact 15, effectively ensuring the arc-initiating effect.

[0047] Preferably, the number of short moving contacts on each side of the long moving contact 15 is greater than the number of long moving contacts. Increasing the number of short moving contacts increases the current-carrying capacity of the contact system. At the same time, when an arc is initiated on both sides of the short moving contact 5 in the width direction, the arc root can be smoothly transferred to the first moving arc-initiating plate 9 on the wider second segment 14, preventing continuous burning at the two edges of the short moving contact 5 in the width direction.

[0048] like Figure 9 and Figure 10 As shown, the first moving arc-initiating plate 9 is located outside the first gas-generating element 3 and the second gas-generating element 4, and the second arc-initiating part 16 of the second moving arc-initiating plate 22 is located between the first gas-generating element 3 and the second gas-generating element 4. A narrow slit is formed between the first gas-generating element 3 and the second gas-generating element 4 to accelerate the entry of the arc of the long moving contact 15 into the arc-extinguishing chamber.

[0049] Furthermore, such as Figure 11 As shown, two partitions 23 are provided on both sides of the second moving arc-inducing plate 22, forming a narrow slit between the two partitions 23. The two partitions 23 form a narrow slit between the first gas-generating component 3 and the second gas-generating component 4, respectively. The first intermediate connecting parts 12 of the two first moving arc-inducing plates 9 are located in the two narrow slits, respectively, and the second section 14 is located outside the first gas-generating component 3 and the second gas-generating component 4.

[0050] In the optional technical solution of this embodiment, a static arc-inducing element 20 is also included. One end of the static arc-inducing element 20 is located at the other end of the arc-extinguishing chamber 1 along the arrangement direction of the arc-extinguishing grid plates 6. The minimum distance between the moving arc-inducing element 2 and the static arc-inducing element 20 is greater than the maximum opening distance of the contact system. When there is an arc voltage drop, a second breakdown point will be formed, far away from the silver point of the contact, to avoid severe contact erosion.

[0051] In the optional technical solution of this embodiment, the first gas generating element 3 is provided with a chamfer 21 on the side near the short-moving contact; and / or the second gas generating element 4 is provided with a chamfer 21 on the side near the short-moving contact.

[0052] In this embodiment, the chamfer 21 can form a narrow channel in the gas generating area, which is beneficial to increase the gas blowing effect and accelerate the transfer and extinguishing of the electric arc. At the same time, the chamfer 21 structure is designed to match the structure of the first moving arc-initiating plate 9, which is beneficial to the transfer of the arc root of the edge arc to the arc extinguishing chamber 1.

[0053] The circuit breaker provided in this embodiment includes the arc-extinguishing structure of the contact system described above. Therefore, the technical advantages and effects achieved by the circuit breaker include the technical advantages and effects achieved by the arc-extinguishing structure of the contact system described above, which will not be repeated here.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An arc quenching structure of a contact system, characterized by, The arc-extinguishing structure includes: an arc-extinguishing chamber (1), a moving arc-starting element (2), a first gas-generating element (3), and a second gas-generating element (4); the contact system includes a short moving contact (5) and a stationary contact. The arc-extinguishing chamber (1) is provided with a plurality of arc-extinguishing grid plates (6) arranged in sequence. The arc-extinguishing grid plate (6) includes a base (7). The first gas generating element (3) and the second gas generating element (4) are located on both sides of the base (7). The moving arc-starting component (2) includes at least one first moving arc-starting plate (9). Along the length direction of the first moving arc-starting plate (9), the first moving arc-starting plate (9) includes a first end (10) located at one end of the first moving arc-starting plate (9), a first arc-starting part (11) located at the other end of the first moving arc-starting plate (9), and a first intermediate connecting part (12) located between the two ends of the first moving arc-starting plate (9). The first end (10) is located at one end of the arc-extinguishing chamber (1) along the arrangement direction of the arc-extinguishing grid (6) and corresponds to the base (7). The first arc-starting part (11) is V-shaped and includes a first segment (13) and a second segment (14). The first segment (13) is connected to the first intermediate connecting part (12), and the second segment (14) is correspondingly engaged with the short moving contact (5). Along the width direction of the first moving arc plate (9), the width of the second segment (14) is greater than the width of the first intermediate connecting part (12).

2. Arc extinguishing structure of a contact system according to claim 1, characterized in that The moving arc-inducing component (2) also includes a second moving arc-inducing plate (22), and the contact system also includes a long moving contact (15), which is located in the middle of the short moving contact (5) and protrudes from the short moving contact (5). Along the length direction of the second moving arc-starting plate (22), the second moving arc-starting plate (22) includes a second end located at one end of the second moving arc-starting plate (22), a second arc-starting part (16) located at the other end of the second moving arc-starting plate (22), and a second intermediate connecting part (17) located between the two ends of the second moving arc-starting plate (22). The second end is located at one end of the arc-extinguishing chamber (1) along the arrangement direction of the arc-extinguishing grid (6) and corresponds to the base (7). The second arc-starting part (16) bends toward or away from the stationary contact relative to the second intermediate connecting part (17) and corresponds to and cooperates with the long moving contact (15). The moving arc-starting component (2) includes two first moving arc-starting plates (9) and one second moving arc-starting plate (22), and the second moving arc-starting plate (22) is located between the two first moving arc-starting plates (9).

3. Arc extinguishing structure of a contact system according to claim 2, characterized in that The second arc-leading part (16) is V-shaped and includes a third segment (18) and a fourth segment (19). The third segment (18) is connected to the second intermediate connecting part (17), and the fourth segment (19) is correspondingly engaged with the long moving contact (15).

4. The arc quenching structure of a contact system of claim 1, wherein, The first intermediate connecting part (12) is located between the first gas generating element (3) and the second gas generating element (4), and the second segment (14) is located outside the first gas generating element (3) and the second gas generating element (4).

5. The arc quenching structure of a contact system according to claim 3, characterized in that, The first ends (10) of the two first moving arc-starting plates (9) are connected or integrally formed, or the second end of the second moving arc-starting plate (22) is connected or integrally formed with the first end (10) of at least one of the two first moving arc-starting plates (9); and / or; The second segment (14) of the two first moving arc plates (9) are connected or integrally formed at the ends away from the first segment (13).

6. The arc quenching structure of a contact system of claim 2, wherein, The width of the second moving arc-inducing plate (22) is greater than or equal to the width of the long moving contact (15).

7. An arc quenching structure of a contact system according to any one of claims 1-6, characterized in that, The width of the second segment (14) of the moving arc-drawing member (2) is greater than or equal to the width of the short moving contact (5).

8. An arc quenching structure of a contact system according to any one of claims 1-6, characterized in that, The width of the first end portion (10) is greater than the width of the first intermediate connecting portion (12).

9. Arc extinguishing structure of a contact system according to any one of claims 1-6, characterized in that The first gas-generating component (3) has a chamfer (21) on the side near the short-moving contact (5); and / or; The second gas-generating component (4) has a chamfer (21) on the side near the short-moving contact (5).

10. The arc quenching structure of a contact system of claim 2, wherein, The short moving contact (5) includes a short moving contact piece, and the long moving contact (15) includes a long moving contact piece; The number of long moving contacts in the long moving contact (15) is less than or equal to the number of short moving contacts in the short moving contacts (5) on each side of the long moving contact (15).

11. The arc- quenching structure of a contact system of claim 2, wherein, It also includes two partitions (23), which are disposed opposite to each other between the first gas generating element (3) and the second gas generating element (4); The second moving arc-inducing plate (22) is disposed in the gap between the two partitions (23); The first intermediate connecting part (12) of one of the first moving arc-inducing plates (9) is located in the gap between one of the partitions (23) and the first gas-generating component (3), and the second segment (14) is located outside the first gas-generating component (3). The first intermediate connecting part (12) of another first moving arc-inducing plate (9) is located in the gap between another partition (23) and the second gas-generating component (4), and the second segment (14) is located outside the second gas-generating component (4).

12. The arc-extinguishing structure of the contact system according to claim 2, characterized in that, The first moving arc-inducing plate (9) is located outside the first gas-generating component (3) and the second gas-generating component (4), and the second arc-inducing part (16) is located between the first gas-generating component (3) and the second gas-generating component (4).

13. The arc- quenching structure of a contact system of claim 1, wherein, The V-shaped opening of the first arc-leading part (11) is away from the stationary contact.

14. The arc- quenching structure of a contact system according to claim 3, characterized in that, The V-shaped opening of the second arc-leading part (16) is away from the stationary contact.

15. A circuit breaker characterized by, The arc-extinguishing structure of the contact system as described in any one of claims 1-14.

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