Arc extinguishing structure of contact system and circuit breaker

Abstract

The invention relates to the technical field of circuit breakers, in particular to an arc extinguishing structure of a contact system and a circuit breaker. The arc extinguishing structure of the contact system comprises an arc extinguishing chamber, a movable arc striking piece, a first gas generating piece and a second gas generating piece. The contact system comprises a short movable contact. The arc extinguishing chamber is provided with a plurality of arc extinguishing grid sheets which are arranged in sequence, the movable arc striking piece comprises at least one first movable arc striking plate, the first movable arc striking plate comprises a first end part, a first arc striking part and a first middle connecting part, the first arc striking part is V-shaped and comprises a first section and a second section, the first section is connected with the first middle connecting part, and the second section is connected with the second middle connecting part. The second section is correspondingly matched with the short moving contact; the width of the second section is larger than that of the first middle connecting part. The current density can be increased, the arc root magnetic blow-out force is enhanced, moving arc root transfer is facilitated, the gas space between the arc extinguishing grid plates is increased, a backflow gas channel is formed, and gas flow rebound and vortex are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit breakers, in particular to an arc extinguishing structure of a contact system and a circuit breaker. BACKGROUND

[0002] The existing arc extinguishing chamber structure of a short contact piece is matched with a short contact system, and the arc transfer of the arc guide plate at the moving end is not smooth. The main reasons are as follows: 1. Low current density and weak magnetic blowing force; 2. The backflow air channel is blocked, forming eddy current, which is not conducive to the arc transfer to the arc guide plate at the moving end; and 3. Because of the size limitation of the arc guide plate at the moving end, the gas generating element cannot form a narrow gap, and the gas blowing effect is poor. SUMMARY

[0003] The present application aims to provide an arc extinguishing structure of a contact system and a circuit breaker to solve the technical problem of the arc transfer of the arc guide plate at the moving end of the existing contact system matched with a short contact piece.

[0004] In a first aspect, the present application provides an arc extinguishing structure of a contact system, which comprises an arc extinguishing chamber, an arc guide element, a first gas generating element and a second gas generating element, and the contact system comprises a short moving contact and a stationary contact. The arc extinguishing chamber is provided with a plurality of arc extinguishing grid pieces arranged in sequence, the arc extinguishing grid piece comprises a base, and the first gas generating element and the second gas generating element are respectively located on both sides of the base. The arc guide element comprises at least one first arc guide plate, along the length direction of the first arc guide plate, the first arc guide plate comprises a first end portion located at one end of the first arc guide plate, a first arc guide portion located at the other end of the first arc guide plate, and a first intermediate connecting portion located between the two ends of the first arc guide plate, the first end portion is located at one end of the arc extinguishing chamber along the arrangement direction of the arc extinguishing grid piece and corresponds to the base, the first arc guide portion is V-shaped and comprises a first segment and a second segment, the first segment is connected with the first intermediate connecting portion, and the second segment is matched with the short moving contact; Along the width direction of the first arc guide plate, the width of the second segment is greater than the width of the first intermediate connecting portion.

[0005] In an optional embodiment, the arc guide element further comprises a second arc guide plate, and the contact system further comprises a long moving contact, the long moving contact is located at the middle part of the short moving contact and protrudes from the short moving contact. The second arc-guiding plate comprises a second end portion at one end of the second arc-guiding plate, a second arc-guiding portion at the other end of the second arc-guiding plate, and a second intermediate connecting portion between the two ends of the second arc-guiding plate. The second end portion is located at one end of the arc-extinguishing chamber along the arrangement direction of the arc-extinguishing grid and corresponds to the base portion. The second arc-guiding portion is bent towards or away from the stationary contact relative to the second intermediate connecting portion and corresponds to the long movable contact. In the embodiment, the arc-guiding member comprises two first arc-guiding plates and one second arc-guiding plate, and the second arc-guiding plate is located between the two first arc-guiding plates.

[0006] In the embodiment, the second arc-guiding portion is V-shaped and comprises a third segment and a fourth segment. The third segment is connected to the second intermediate connecting portion, and the fourth segment corresponds to the long movable contact.

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

[0008] In the embodiment, the first end portions of the two first arc-guiding plates are connected or integrally formed, or the second end portion of the second arc-guiding plate is connected or integrally formed with the first end portion of at least one of the two first arc-guiding plates. and / or The second segments of the two first arc-guiding plates are connected or integrally formed at the ends away from the first segments.

[0009] In the embodiment, the width of the second arc-guiding plate is greater than or equal to the width of the long movable contact.

[0010] In the embodiment, the width of the second segment of the arc-guiding member is greater than or equal to the width of the short movable contact.

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

[0012] In the embodiment, the first gas-generating member is provided with a chamfer on the side close to the short movable contact. and / or The second gas-generating member is provided with a chamfer on the side close to the short movable contact.

[0013] In the embodiment, the short movable contact comprises a short movable contact piece, and the long movable contact comprises a long movable contact piece. The number of the long moving contact pieces in the long moving contact is less than or equal to the number of the short moving contact pieces in the short moving contact on each side of the long moving contact.

[0014] In an optional embodiment, two partitions are further included, and the two partitions are oppositely arranged between the first gas generating member and the second gas generating member. The second arc striking member is arranged in a gap between the two partitions. The first intermediate connecting part of one of the first arc striking members is arranged in a gap between one of the partitions and the first gas generating member, and the second section is arranged outside the first gas generating member; the first intermediate connecting part of the other of the first arc striking members is arranged in a gap between the other of the partitions and the second gas generating member, and the second section is arranged outside the second gas generating member.

[0015] In an optional embodiment, the first arc striking member is arranged outside the first gas generating member and the second gas generating member, and the second arc striking member is arranged between the first gas generating member and the second gas generating member.

[0016] In an optional embodiment, the V-shaped opening of the first arc striking member faces away from the stationary contact.

[0017] In an optional embodiment, the V-shaped opening of the second arc striking member faces away from the stationary contact.

[0018] In a second aspect, the application provides a circuit breaker comprising the arc extinguishing structure of the contact system according to any one of the preceding 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 the application are as follows: The arc extinguishing structure of the contact system comprises an arc extinguishing chamber, a moving arc striking member, a first gas generating member and a second gas generating member, and the contact system comprises a short moving contact and a stationary contact; the arc extinguishing chamber is provided with a plurality of arc extinguishing grid pieces arranged in sequence, and the arc extinguishing grid piece comprises a base part; the first gas generating member and the second gas generating member are respectively arranged on two sides of the base part; the moving arc striking member comprises at least one first arc striking member; along the length direction of the first arc striking member, the first arc striking member comprises a first end part arranged at one end of the first arc striking member, a first arc striking part arranged at the other end of the first arc striking member, and a first intermediate connecting part arranged between the two ends of the first arc striking member; the first end part is arranged at one end of the arc extinguishing chamber along the arrangement direction of the arc extinguishing grid piece, and corresponds to the base part; the first arc striking part is in a V shape and comprises a first section and a second section; the first section is connected with the first intermediate connecting part, and the second section is correspondingly matched with the short moving contact; along the width direction of the first arc striking member, the width of the second section is greater than the width of the first intermediate connecting part.

[0020] Due to the width of the first intermediate connecting part relative to the second section, the current density can be increased, the arc root magnetic blowing force is strengthened, the arc root transfer is facilitated, and the gas space between the arc extinguishing grid is increased, forming a backflow air channel, avoiding airflow rebound and vortex; due to the width of the second section being greater than the width of the first intermediate connecting part, when the arc is generated on both sides of the width direction of the short moving contact, the arc root can be smoothly transferred to the first arc guide plate on the second section with a larger width, preventing continuous burning on both edges of the short moving contact in the width direction. Due to the V-shaped first arc guide part, the current flow direction is opposite, which is beneficial to increase the local magnetic field strength of the arc root and accelerate the arc transfer.

[0021] The circuit breaker provided by the application comprises the arc extinguishing structure of the contact system, and therefore has the technical advantages and effects of the arc extinguishing structure of the contact system, which will not be described in detail here.

[0022] Other features and advantages of the application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the drawings needed in the following specific embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0024] Figure 1 A schematic view of the cooperation structure of the first arc guide plate, the short moving contact and the arc chamber provided by the embodiment of the application is shown in the figure. Figure 2 A schematic view of the cooperation structure of the first arc guide plate, the short moving contact and the arc chamber provided by the embodiment of the application is shown in the figure. Figure 1 A sectional view of the cooperation structure of the first arc guide plate, the short moving contact and the arc chamber provided by the embodiment of the application is shown in the figure. Figure 3 A schematic view of the cooperation structure of the first arc guide plate and the short moving contact provided by the embodiment of the application is shown in the figure. Figure 4 A schematic view of the first gas generating part structure provided by the embodiment of the application is shown in the figure. Figure 5 A sectional view of the cooperation structure of the integrated arc guide part, the short moving contact and the long moving contact and the arc chamber provided by the embodiment of the application is shown in the figure. Figure 6 A schematic view of the cooperation structure of the integrated arc guide part, the short moving contact and the long moving contact provided by the embodiment of the application is shown in the figure. Figure 7 A side view of the cooperation structure of the integrated arc guide part, the short moving contact and the long moving contact provided by the embodiment of the application is shown in the figure. Figure 8The integrated moving arc piece structure schematic diagram provided by the embodiment of the present application is shown in the figure. Figure 9 The integrated moving arc piece installation position one side schematic diagram provided by the embodiment of the present application is shown in the figure. Figure 10 The integrated moving arc piece installation position another side schematic diagram provided by the embodiment of the present application is shown in the figure. Figure 11 The integrated moving arc piece and the partition plate cooperation installation schematic diagram provided by the embodiment of the present application is shown in the figure.

[0025] Figure: 1-arc chamber; 2-moving arc piece; 3-first gas generating piece; 4-second gas generating piece; 5-short moving contact; 6-arc extinguishing grid; 7-base; 8-leg; 9-first moving arc plate; 10-first end; 11-first arc leading part; 12-first intermediate connecting part; 13-first section; 14-second section; 15-long moving contact; 16-second arc leading part; 17-second intermediate connecting part; 18-third section; 19-fourth section; 20-static arc leading piece; 21-chamfer; 22-second moving arc plate; 23-partition plate. DETAILED DESCRIPTION

[0026] The technical solutions of the present application will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0027] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] In addition, the technical solutions in the various embodiments can be combined with each other, but the combination of the technical solutions should be considered not to exist and not within the protection scope of the present application on the basis that the combination of the technical solutions can be realized by the ordinary skilled in the art, and the combination of the technical solutions cannot be realized or contradicts each other.

[0030] The present application will be further described in detail below with reference to specific embodiments and in conjunction with the drawings.

[0031] The specific structure is shown in Figures 1 to 10 .

[0032] The embodiment provides an arc extinguishing structure of a contact system, the arc extinguishing structure comprising: an arc extinguishing chamber 1, a moving arc initiation piece 2, a first gas generating piece 3 and a second gas generating piece 4, the contact system comprising a short moving contact 5 and a stationary contact; the arc extinguishing chamber 1 is provided with a plurality of arc extinguishing fins 6 arranged in sequence, the arc extinguishing fin 6 comprises a base 7 and a pair of spaced legs 8 located on both sides of the base 7, the first gas generating piece 3 and the second gas generating piece 4 are respectively covered on the pair of legs 8 of all the arc extinguishing fins 6; the moving arc initiation piece 2 comprises at least one first moving arc initiation plate 9, along the length direction of the first moving arc initiation plate 9, the first moving arc initiation plate 9 comprises a first end portion 10 located at one end of the first moving arc initiation plate 9, a first arc initiation portion 11 located at the other end of the first moving arc initiation plate 9 and a first intermediate connecting portion 12 located between the two ends of the first moving arc initiation plate 9, the first end portion 10 is located at one end of the arc extinguishing chamber 1 along the arrangement direction of the arc extinguishing fin 6, and corresponds to the base 7, the first arc initiation portion 11 is V-shaped and comprises a first segment 13 and a second segment 14, the first segment 13 is connected with the first intermediate connecting portion 12, and the second segment 14 corresponds to the short moving contact 5 and is matched with the short moving contact 5; along the width direction of the first moving arc initiation 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 the embodiment, when only one first moving arc initiation plate 9 is provided, the first intermediate connecting portion 12 is located between the first gas generating piece 3 and the second gas generating piece 4, and the second segment 14 is located outside the first gas generating piece 3 and the second gas generating piece 4. Since the width of the first intermediate connecting portion 12 is contracted relative to the first end portion 10 and the second segment 14, the current density can be increased, the arc root magnetic blowing force can be strengthened, the moving arc root can be transferred conveniently, and the gas space between the arc extinguishing fin 6 is increased to form a backflow air channel to avoid airflow rebound and vortex; since the width of the second segment 14 is greater than the width of the first intermediate connecting portion 12, when the short moving contact 5 is arced at both sides in the width direction, the arc moving arc root can be smoothly transferred to the first moving arc initiation plate 9 on the second segment 14 with a larger width, so as to prevent continuous burning at the edges of the short moving contact 5 in the width direction. Since the first arc initiation portion 11 is V-shaped, the current flow direction is opposite, which is beneficial 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 sheet 6 can also only include the base 7, at this time the first gas generating member 3 and the second gas generating member 4 are located on both sides of the base 7 respectively.

[0035] In this embodiment, the width of the first end portion 10 can also be not greater than the width of the first intermediate connecting portion 12, which is specifically determined according to actual needs.

[0036] In an optional technical solution of this embodiment, the moving arc guiding member 2 further includes a second moving arc guiding plate 22, and the contact system further includes a long moving contact 15, which is located at 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 guiding plate 22, the second moving arc guiding plate 22 includes a second end portion located at one end of the second moving arc guiding plate 22, a second arc guiding portion 16 located at the other end of the second moving arc guiding plate 22, and a second intermediate connecting portion 17 located between the two ends of the second moving arc guiding plate 22, the second end portion is located at one end of the arc-extinguishing chamber 1 along the arrangement direction of the arc-extinguishing grid sheet 6, and corresponds to the base 7, the second arc guiding portion 16 is bent towards 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] Because the conventional arc-extinguishing chamber 1 with a long contact sheet (also known as an arc contact, i.e., the long moving contact 15 of the present application) in the prior art, when designing the contact system, it is deliberately designed to be short contact sheet (i.e., the short moving contact 5 of the present application) first separation, long contact sheet after separation logic (i.e., the short contact sheet and the long contact sheet exist when opening time difference), the purpose is that the contact only on the long contact sheet when opening arc. However, the actual design deviation leads to the opening time difference of the short contact sheet and the long contact sheet being too small, and as the client voltage increases, the short contact sheet will arc, the conventional arc guiding structure cannot arc, resulting in the arc cannot enter the arc-extinguishing chamber 1, and the breaking fails.

[0038] In this embodiment, in view of the problems existing in the prior art described above, the moving arc guiding member 2 is designed to further include a second moving arc guiding plate 22, the first moving arc guiding plate 9 and the second moving arc guiding plate 22 guide the arc for the short moving contact 5 and the long moving contact 15 respectively, and because the first moving arc guiding plate 9 cooperates with the short moving contact 5 to effectively guide the arc into the arc-extinguishing chamber 1, the breaking effect can be effectively guaranteed.

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

[0040] In an optional technical solution of this embodiment, the moving arc guiding member 2 includes two first moving arc guiding plates 9 and one second moving arc guiding plate 22, and the second moving arc guiding plate 22 is located between the two first moving arc guiding plates 9. It is compact and occupies small space. Figure 6As shown, the first arc striking part 11 of the two first arc striking plates 9 is V-shaped and the V-shaped opening faces away from the static contact, and the second arc striking part 16 is V-shaped and the V-shaped opening faces the static contact. Preferably, the second arc striking part 16 is V-shaped and the V-shaped opening faces away from the static contact.

[0041] In an optional technical solution of the embodiment, the first end part 10 of the two first arc striking plates 9 is connected or integrally formed; and / or the second section 14 of the two first arc striking plates 9 is connected or integrally formed at the end away from the first section 13. This facilitates manufacturing and improves the arc striking effect.

[0042] In an optional technical solution of the embodiment, the second end part of the second arc striking plate 22 is connected or integrally formed with the first end part 10 of at least one of the two first arc striking plates 9.

[0043] In the embodiment, the second end part of the second arc striking plate 22 can be connected or integrally formed with the first end part 10 of any one of the two first arc striking plates 9. Preferably, the second end part of the second arc striking plate 22 is connected or integrally formed with the first end part 10 of the two first arc striking plates 9, which facilitates manufacturing and improves the overall arc striking effect. In addition, the second section 14 of the two first arc striking plates 9 is connected or integrally formed at the end away from the first section 13, and the first arc striking plate 9 and the second arc striking plate 22 form an integrated arc striking member 2.

[0044] In an optional technical solution of the embodiment, the short movable contact 5 includes at least two short movable contact pieces, and preferably the width of the second section 14 of the arc striking member 2 is greater than the width of the short movable contact 5. Figure 2 As shown, the first arc striking part 11 is V-shaped and the V-shaped opening faces away from the static contact.

[0045] In the embodiment, when the arc striking member 2 includes one first arc striking plate 9, the width of the second section 14 of the arc striking plate is greater than the width of the short movable contact 5; when the arc striking member 2 includes two first arc striking plates 9, the width of the second section 14 of the two arc striking plates is greater than the width of the short movable contact 5, which effectively ensures the arc striking effect.

[0046] In the embodiment, the long movable contact 15 includes at least one long movable contact piece, and the width of the second arc striking plate 22 is greater than or equal to the width of the long movable contact 15, which effectively ensures the arc striking effect.

[0047] Preferably, the number of short movable contact pieces on each side of the long movable contact 15 is greater than the number of long movable contact pieces. Increasing the number of short movable contact pieces increases the current carrying capacity of the contact system. At the same time, when the arc is struck on both sides of the short movable contact 5 in the width direction, the arc root can be smoothly transferred to the first arc striking plate 9 on the second section 14 with a larger width, preventing continuous burning at the edges of the short movable contact 5 in the width direction.

[0048] As shown,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 the present invention, and not to limit them; although the present invention 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; and these 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 the present invention.

Claims

1. An arc-extinguishing structure for a contact system, characterized in that, 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. The arc-extinguishing structure of the 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. The arc-extinguishing structure of the 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-extinguishing structure of the contact system according to claim 1, characterized in that, 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-extinguishing structure of the 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-extinguishing structure of the contact system according to claim 2, characterized in that, 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. The arc-extinguishing structure of the 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. The arc-extinguishing structure of the 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. The arc-extinguishing structure of the 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-extinguishing structure of the contact system according to claim 2, characterized in that, 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-extinguishing structure of the contact system according to claim 2, characterized in that, 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-extinguishing structure of the contact system according to claim 1, characterized in that, The V-shaped opening of the first arc-leading part (11) is away from the stationary contact.

14. The arc-extinguishing structure of the 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 in that, The arc-extinguishing structure of the contact system as described in any one of claims 1-14.

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