Contact arc extinguishing system

Abstract

The utility model provides an arc extinguishing system. The arc extinguishing system comprises a first arc extinguishing group, a second arc extinguishing group, a third arc extinguishing group, a first end tab, a second end tab, an insulating shell, a contact group, a conducting piece and an end cover. The contact piece group is opposite to the conduction piece. And the three arc extinguishing groups are arranged in the insulating shell and are arranged behind the contact group together. And the first run-on plate is tightly attached to the conduction piece and is arranged below the first arc extinguishing group. And the second run-on plate is arranged above the third arc extinguishing group. A contact plate is arranged at one end, facing the contact group, of the second run-on plate. Magnetism increasing plates are arranged on the two sides of the contact plate, and a local magnetism increasing area is defined by the magnetism increasing plates and the contact plate. The arc extinguishing group is matched with the long contact piece of the contact group to form an arc striking structure, and when the circuit breaker is switched off, a local magnetism increasing area is constructed at the stopping position of the long contact piece of the contact group, so that the electromagnetic driving force of an arc entering the arc extinguishing group is improved. Meanwhile, staggered main cutting areas and side cutting areas are arranged in the arc extinguishing groups, group-by-group, batch and partition cutting of the arc and the cutting blades is achieved, the arc cutting difficulty is lowered, and the arc extinguishing capacity of the contact arc extinguishing system is improved.

Description

Technical Field

[0001] The present invention relates to a circuit breaker, and particularly to a contact arc extinguishing system of the circuit breaker. Background Art

[0002] Circuit breakers are mainly used in distribution networks to distribute electric energy, protect lines and power supply equipment from being damaged by faults such as overload, undervoltage, short circuit, and single-phase grounding. Under normal conditions, they can also be used for infrequent line switching. The protection of the circuit breaker for the distribution line mainly occurs when a fault such as a short circuit occurs. The contact blade group of the circuit breaker is driven by a mechanical system to move, so that the contact blade group is separated from the conducting member, thereby cutting off the fault current and implementing line protection. However, during the separation of the contact blade group and the conducting member, the fault current of the protected line cannot be directly cut off. A high-temperature and high-pressure arc will be generated between them, maintaining the conduction of the protected line, and it is difficult to cut off the fault current. Most of the existing technologies adopt an arc extinguishing system composed of arc extinguishing grid plates, an insulating shell, a contact blade group, a conducting member, and an end cover to extinguish the high-temperature and high-pressure arc during the process of the circuit breaker cutting off the fault current. When an arc is generated, the arc will be attracted by the arc extinguishing grid plates, enter the arc extinguishing system, and be cut and cooled by the grid plates to be extinguished. Whether the arc can be extinguished when entering the arc extinguishing system and being cut by the grid plates depends mainly on whether the number of grid plates effectively cut by the arc is large enough. As the number of grid plates increases, it becomes difficult for the arc to cut the grid plates, resulting in an insufficient number of grid plates effectively cut by the arc. Even if the arc is cut and cooled by a certain number of grid plates, it is still difficult to be extinguished, and the fault current cannot be cut off. With the gradual increase in the voltage of the distribution system in the new energy field, the number of grid plates in the arc extinguishing system of the circuit breaker increases, and this problem becomes more prominent. Summary of the Invention

[0003] The object of the present invention is to provide an arc extinguishing system with local magnetic enhancement and multiple cutting to solve the problem that it is difficult to extinguish the arc by cutting the grid plates after the number of grid plates in the arc extinguishing chamber increases.

[0004] To achieve the above object, the present invention designs a contact arc extinguishing system, which includes a first arc extinguishing group, a second arc extinguishing group, a third arc extinguishing group, a first arc guiding plate, a second arc guiding plate, an insulating shell, a contact piece group, a conducting member, and an end cover. The contact piece group is opposite to the conducting member. The first arc extinguishing group, the second arc extinguishing group, and the third arc extinguishing group are arranged inside the insulating shell. The first arc extinguishing group, the second arc extinguishing group, and the third arc extinguishing group are arranged behind the contact piece group. An end cover is installed behind the first arc extinguishing group, the second arc extinguishing group, and the third arc extinguishing group. The first arc guiding plate is closely attached to the conducting member and is placed below the first arc extinguishing group; the second arc guiding plate is placed above the third arc extinguishing group. The first arc extinguishing group and the third arc extinguishing group are composed of several sub-cutting pieces. The second arc extinguishing group is composed of several main cutting pieces. Particularly, one end of the second arc guiding plate facing the contact piece group is provided with a contact plate. On both sides of the contact plate of the second arc guiding plate, there are magnetic enhancement plates, which enclose a local magnetic enhancement area with the contact plate.

[0005] Further, one end of the second arc guiding plate facing the third arc extinguishing group is provided with an extension plate. The extension plate is placed at the upper end of the third arc extinguishing group. The extension plate is arranged in parallel with the sub-cutting pieces of the third arc extinguishing group. At the center position of one end of the extension plate facing the contact piece group, a contact plate is bent out. On both sides of the contact plate of one end of the extension plate facing the contact piece group, transition plates are bent out. The transition plates are bent towards the contact plate to form magnetic enhancement plates. The magnetic enhancement plates enclose a local magnetic enhancement area with the contact plate.

[0006] Further, one end of the conducting member facing the contact piece group is a contact section. On one surface of the contact section facing the contact piece group, a static main contact and a static sub-contact are fixed. One end of the conducting member away from the contact piece group is a connection section. The connection section is arranged perpendicular to the contact section. The connection section and the contact section are naturally transitionally connected through an inclined transition section.

[0007] Further, a long contact piece is arranged at the center of the contact piece group. Several second contact pieces and several short contact pieces are sequentially arranged on both sides of the contact piece group. On one side of the long contact piece facing the conducting member, a moving main contact and a moving sub-contact are provided. The moving main contact is opposite to the static main contact. The moving sub-contact is opposite to the static sub-contact. The long contact piece automatically extends a arcing arm from the moving sub-contact towards the second arc guiding plate. On one side of the second contact piece facing the conducting member, a second main contact and a second sub-contact are provided. The second main contact is opposite to the static main contact; the second sub-contact is opposite to the static sub-contact. On one side of the short contact piece facing the conducting member, a third main contact is provided. The third main contact is opposite to the static main contact. In the open state of the circuit breaker, the arcing arm of the long contact piece is placed in the local magnetic enhancement area.

[0008] Furthermore, an inclined mounting plate is provided at one end of the first arc-starting plate facing the conducting member. The mounting plate is fitted with the transition section of the conducting member. The first arc-starting plate is bent from the mounting plate toward the contact piece group to form a jump plate. The jump plate is level with the contact section on the conducting member; the jump plate is flush with the auxiliary contact. An arc-fixing plate is provided at one end of the first arc-starting plate facing the first arc extinguishing group. The arc-fixing plate is placed below the first arc extinguishing group. The arc-fixing plate is arranged in parallel with the auxiliary cutting piece of the first arc extinguishing group. The jump plate and the arc-fixing plate are naturally transitionally connected by an inclined connecting plate.

[0009] Furthermore, a main cutting body is provided on one side of the main cutting blade close to the end cover. The main cutting blade naturally transitions from the main cutting body to the contact blade group, and the left and right sides respectively extend to form a main blade wide arm and a main blade narrow arm. The main blade wide arm on the side facing the center line of the main cutting blade, the main blade wide arm cutting convex, the main blade wide arm concave, the main blade wide arm bevel, and the main blade wide arm edge are naturally transitioned in sequence from the main cutting body to the contact blade group. The main blade narrow arm on the side facing the center line of the main cutting blade, the main blade narrow arm cutting convex, the main blade narrow arm bevel, and the main blade narrow arm edge are naturally transitioned in sequence from the main cutting body to the contact blade group. The main blade wide arm concave edge is relatively matched with the main blade narrow arm concave edge, and together they constitute the main cutting area of ​​the main blade, and the main blade wide arm concave edge is closer to the center line of the main cutting blade than the main blade narrow arm concave edge. The main piece wide arm concave is relatively matched with the main piece narrow arm cutting convex, and the main piece wide arm bevel is relatively matched with the main piece narrow arm bevel, and together they form the main piece side cutting area. The main piece narrow arm cutting convex is closer to the main cutting piece center line than the main piece wide arm concave, and the main piece wide arm bevel is closer to the main cutting piece center line than the main piece narrow arm bevel.

[0010] Furthermore, a secondary cutting body is provided on one side of the secondary cutting piece close to the end cover. From the secondary cutting body to the contact piece group, the secondary cutting piece naturally transitions to extend the secondary wide arm and the secondary narrow arm on the left and right sides. The secondary wide arm on the side facing the center line of the secondary cutting piece is naturally transitioned from the secondary cutting body to the contact piece group to arrange the secondary wide arm concave edge, the secondary wide arm cutting convex, the secondary wide arm concave, the secondary wide arm bevel, and the secondary wide arm edge in sequence. The secondary narrow arm on the side facing the center line of the secondary cutting piece is naturally transitioned from the secondary cutting body to the contact piece group to arrange the secondary narrow arm concave edge, the secondary narrow arm cutting convex, the secondary narrow arm bevel, and the secondary narrow arm edge in sequence. The secondary wide arm concave edge is relatively matched with the secondary narrow arm concave edge, and together they constitute the secondary main cutting area, and the secondary wide arm concave edge is closer to the center line of the secondary cutting piece than the secondary narrow arm concave edge. The auxiliary piece wide arm concave is relatively matched with the auxiliary piece narrow arm cutting convex, and the auxiliary piece wide arm bevel is relatively matched with the auxiliary piece narrow arm bevel, and together constitute the auxiliary piece side cutting area, the auxiliary piece narrow arm cutting convex is closer to the auxiliary cutting piece center line than the auxiliary piece wide arm concave, and the auxiliary piece wide arm bevel is closer to the auxiliary cutting piece center line than the auxiliary piece narrow arm bevel.

[0011] Furthermore, on the left and right sides of the insulating shell, there are several corresponding mounting grooves arranged in a one-to-one manner. On the side of the insulating shell facing the contact blade group, a first protective shell is arranged on the left and right near the first arcing plate, a third protective shell is arranged on the left and right near the second arcing plate, and a second protective shell is arranged in the middle on the left and right. The first protective shell, the second protective shell, and the third protective shell on the same side are naturally connected and transitioned in sequence.

[0012] Furthermore, the main blade wide arm and the main blade narrow arm of the main cutting blade are placed inside the second protective shell of the insulating shell. The sub-blade wide arm and the sub-blade narrow arm of the sub-cutting blade are placed inside the first protective shell and the third protective shell of the insulating shell.

[0013] The technical effect of the present invention is that the second arcing plate forms an arcing structure matching the long contact of the contact blade group through bending, and more importantly, in the open state of the circuit breaker, a local magnetic enhancement area is constructed at the final docking position of the long contact of the contact blade group, thereby significantly enhancing the electromagnetic driving force for the arc to enter the arc extinguishing group. In addition, multiple arc extinguishing groups with different lengths and different front and rear positions of the cutting protrusions and the central depressions for arc cutting are arranged in the cavity of the arc extinguishing system, and staggered main cutting areas and side cutting areas are arranged in the arc extinguishing group, realizing the cutting of the arc with the cutting blade group by group, in batches, and in zones, thereby reducing the difficulty of arc cutting and enhancing the ability of the contact arc extinguishing system to cut and extinguish the arc. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Three-dimensional structure schematic diagram of a contact arc extinguishing system according to the present invention;

[0015] Figure 2 Structure schematic diagram of the second arcing plate of a contact arc extinguishing system according to the present invention;

[0016] Figure 3 Structure schematic diagram of the sub-cutting blade of a contact arc extinguishing system according to the present invention;

[0017] Figure 4 Structure schematic diagram of the main cutting blade of a contact arc extinguishing system according to the present invention;

[0018] Figure 5 Structure schematic diagram of the first arcing plate of a contact arc extinguishing system according to the present invention;

[0019] Figure 6 Structure schematic diagram of the insulating shell of a contact arc extinguishing system according to the present invention;

[0020] Figure 7 Structure schematic diagram of the contact blade group of a contact arc extinguishing system according to the present invention;

[0021] Figure 8 Structure schematic diagram of the closing position of a contact arc extinguishing system according to the present invention;

[0022] Figure 9 Schematic diagram of the structure of the opening position of an arc extinguishing system for contacts involved in the present invention. Detailed implementation manners

[0023] The features of various aspects of the present application and exemplary embodiments will be described in detail below. To make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than limiting the present application. For those skilled in the art, the present application can be implemented without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present application by showing examples of the present application.

[0024] Marking description:

[0025] First arc extinguishing group 1; second arc extinguishing group 2; third arc extinguishing group 3;

[0026] Auxiliary cutting piece 10;

[0027] Auxiliary piece wide arm 101; auxiliary piece wide arm edge 1011; auxiliary piece wide arm hypotenuse 1012; auxiliary piece wide arm concave 1013; auxiliary piece wide arm cutting convex 1014; auxiliary piece wide arm concave edge 1015;

[0028] Auxiliary piece narrow arm 102; auxiliary piece narrow arm edge 1021; auxiliary piece narrow arm hypotenuse 1022; auxiliary piece narrow arm cutting convex 1023; auxiliary piece narrow arm concave edge 1024;

[0029] Auxiliary piece cutting body 103; auxiliary piece mounting convex 104;

[0030] Auxiliary cutting piece center line 1090; auxiliary piece cutting concave width 1091; auxiliary piece main cutting area 1092; auxiliary piece side cutting area 1093;

[0031] Main cutting piece 20;

[0032] Main piece wide arm 201; main piece wide arm edge 2011; main piece wide arm hypotenuse 2012; main piece wide arm concave 2013; main piece wide arm cutting convex 2014; main piece wide arm concave edge 2015;

[0033] Main piece narrow arm 202; main piece narrow arm edge 2021; main piece narrow arm hypotenuse 2022; main piece narrow arm cutting convex 2023; main piece narrow arm concave edge 2024;

[0034] Main piece cutting body 203; main piece mounting convex 204;

[0035] Main cutting piece center line 2090; main piece cutting concave width 2091; main piece main cutting area 2092; main piece side cutting area 2093;

[0036] The first arcing plate 4;

[0037] Mounting plate 401; Jumping plate 402; Connecting plate 403; Arc - fixing plate 404; Fixing plate 405;

[0038] The second arcing plate 5;

[0039] Contact plate 501; Transition plate 502; Extension plate 503; Magnetic - enhancing plate 504; Local magnetic - enhancing area 50;

[0040] Insulating shell 6;

[0041] The first protective shell 601; The second protective shell 602; The third protective shell 603;

[0042] Mounting groove 604; Positioning rib 6041; Mounting hole 6042;

[0043] Contact piece group 7;

[0044] Long contact piece 71; Contact arm 7101; Arcing arm 7102; Moving main contact 7103; Moving auxiliary contact 7104;

[0045] Second contact piece 72,; Second main contact 7203; Second auxiliary contact 7204;

[0046] Short contact piece 73; Third main contact 7303;

[0047] End cover 8; Conductive part 9;

[0048] Contact section 901; Transition section 902; Connection section 903; Static main contact 904; Static auxiliary contact 905.

[0049] As Figure 1 shown, an arc - extinguishing system for contacts provided by the present invention includes a first arc - extinguishing group 1, a second arc - extinguishing group 2, a third arc - extinguishing group 3, a first arcing plate 4, a second arcing plate 5, an insulating shell 6, a contact piece group 7, a conductive part 9, and an end cover 8. The contact piece group 7 faces the conductive part 9. When the contact piece group 7 is in contact with the conductive part 9, the circuit breaker is conducting; when the contact piece group 7 is separated from the conductive part 9, the circuit breaker is disconnected. The first arc - extinguishing group 1, the second arc - extinguishing group 2, and the third arc - extinguishing group 3 are placed inside the insulating shell 6; the first arc - extinguishing group 1, the second arc - extinguishing group 2, the third arc - extinguishing group together with the insulating shell 6 are placed behind the contact piece group 7. An end cover 8 is installed behind the first arc - extinguishing group 1, the second arc - extinguishing group 2, and the third arc - extinguishing group 3. The first arcing plate 4 is closely attached to the conductive part 9, and the first arcing plate 4 is placed below the first arc - extinguishing group 1. The second arcing plate 5 is placed above the third arc - extinguishing group 3. The second arc - extinguishing group 2 is composed of several main cutting pieces 20, and the first arc - extinguishing group 1 and the third arc - extinguishing group 3 are composed of several sub - cutting pieces 10.

[0050] Wherein, one end of the conducting member 9 facing the contact piece group 7 is a contact section 901. A static main contact 904 and a static auxiliary contact 905 are fixed on the surface of the contact section 901 facing the contact piece group 7. One end of the conducting member 9 away from the contact piece group 7 is a connection section 903. The connection section 903 is perpendicularly arranged with respect to the contact section 901. The connection section 903 and the contact section 901 are naturally transitionally connected through an inclined transition section 902.

[0051] As Figure 5 shown, one end of the first arcing plate 4 facing the conducting member 9 is provided with an inclined mounting plate 401. The mounting plate 401 is attached to the transition section 902 of the conducting member 9. The first arcing plate 4 is bent out of a jump plate 402 from the mounting plate 401 towards the contact piece group 7. The jump plate 402 is horizontal with the contact section 901 on the conducting member 9. The jump plate 402 is flush with the auxiliary contact 905. One end of the first arcing plate 4 facing the first arc extinguishing group 1 is provided with a fixed arc plate 404. The fixed arc plate 404 is below the first arc extinguishing group 1. The fixed arc plate 404 is arranged in parallel with the auxiliary cutting piece 10 of the first arc extinguishing group 1. The jump plate 402 and the fixed arc plate 404 are naturally transitionally connected through an inclined connecting plate 403. The first arcing plate 4 is bent out of a fixing plate 405 from the mounting plate 401 away from the contact piece group 7. The conducting member 9 is fixedly installed into the inner cavity of the circuit breaker housing through the first arcing plate 4 fixed thereon.

[0052] As Figure 2 shown, one end of the second arcing plate 5 facing the third arc extinguishing group 3 is provided with an extension plate 503. The extension plate 503 is placed at the upper end of the third arc extinguishing group 3. The extension plate 503 is arranged in parallel with the auxiliary cutting piece 10 of the third arc extinguishing group 3. A contact plate 501 is bent out at the middle position of one end of the extension plate 503 facing the contact piece group 7. Transition plates 502 are bent out on both sides of the contact plate 501 at one end of the extension plate 503 facing the contact piece group 7. The transition plates 502 are bent towards the contact plate 501 to form a magnetic enhancement plate 504. The magnetic enhancement plate 504 and the contact plate 501 enclose a local magnetic enhancement area 50.

[0053] As Figure 7As shown, a long contact piece 71 is arranged at the center of the contact piece group 7. A plurality of second contact pieces 72 and a plurality of short contact pieces 73 are sequentially arranged on both sides of the contact piece group 7. On the side of the long contact piece 71 facing the conduction member 9, there are a moving main contact 7103 and a moving sub-contact 7104. The moving main contact 7103 faces the static main contact 904. The moving sub-contact 7104 faces the static sub-contact 905. The long contact piece 71 automatically extends a arcing arm 7102 from the moving sub-contact 7104 to the second arcing plate 5 in a natural transition. When the circuit breaker is in the open state, the arcing arm 7102 is directly in front of the contact plate 501 on the second arcing plate 5 and maintains a distance less than or equal to 5 mm from the contact plate 501. On the side of the second contact piece 72 facing the conduction member 9, there are a second main contact 7203 and a second sub-contact 7204. The second main contact 7203 faces the static main contact 904. The second sub-contact 7204 faces the static sub-contact 905. On the side of the short contact piece 73 facing the conduction member 9, there is a third main contact 7303. The third main contact 7303 faces the static main contact 904.

[0054] As Figure 4As shown, a main blade cutting body 203 is provided on one side of the main cutting blade 20 close to the end cover 8. From the main blade cutting body 203 towards the contact blade group 7, main blade wide arms 201 and main blade narrow arms 202 naturally extend and transition on the left and right sides of the main cutting blade 20 respectively. On the side of the main blade wide arm 201 facing the center line 2090 of the main cutting blade, a main blade wide arm concave edge 2015, a main blade wide arm cutting convex 2014, a main blade wide arm concave 2013, a main blade wide arm hypotenuse 2012, and a main blade wide arm edge 2011 are arranged in sequence and naturally transition from the main blade cutting body 203 towards the contact blade group 7. On the side of the main blade narrow arm 202 facing the center line 2090 of the main cutting blade, a main blade narrow arm concave edge 2024, a main blade narrow arm cutting convex 2023, a main blade narrow arm hypotenuse 2022, and a main blade narrow arm edge 2021 are arranged in sequence and naturally transition from the main blade cutting body 203 towards the contact blade group 7. The main blade wide arm concave edge 2015 and the main blade narrow arm concave edge 2024 are relatively matched to jointly form a main blade main cutting area 2092, and the main blade wide arm concave edge 2015 is closer to the center line 2090 of the main cutting blade than the main blade narrow arm concave edge 2024. An inner concave offset relative to the center line 2090 of the main cutting blade is formed in the main blade main cutting area 2092 of the main cutting blade 20. The main blade wide arm concave 2013 and the main blade narrow arm cutting convex 2023 are relatively matched, and the main blade wide arm hypotenuse 2012 and the main blade narrow arm hypotenuse 2022 are relatively matched to jointly form a main blade side cutting area 2093. The main blade narrow arm cutting convex 2023 is closer to the center line 2090 of the main cutting blade than the main blade wide arm concave 2013, and the main blade wide arm hypotenuse 2012 is closer to the center line 2090 of the main cutting blade than the main blade narrow arm hypotenuse 2022. A plurality of main cutting blades 20 constituting the second arc extinguishing group 2 are arranged with adjacent main cutting blades 20 rotated 180 degrees around the center line 2090 of the main cutting blade. For this reason, the main blade wide arm cutting convexes 2014 of two adjacent grid blades in the main blade main cutting area 2092 are opposite to each other, and the main blade narrow arm cutting convex 2023 in the main blade side cutting area 2093 protrudes and is closer to the center line 2090 of the main cutting blade relative to the main blade wide arm concave 2013 of the adjacent main cutting blade 20; the main blade wide arm hypotenuse 2012 protrudes and is closer to the center line 2090 of the main cutting blade relative to the main blade narrow arm hypotenuse 2022 of the adjacent main cutting blade 20. During the breaking process of the circuit breaker, the formed arc first enters the main blade side cutting area 2093. In this area, it preferentially contacts the protruding main blade wide arm hypotenuse 2012 and the main blade narrow arm cutting convex 2023 and is cut, and then contacts the recessed main blade narrow arm hypotenuse 2022 and the main blade wide arm concave 2013 and is cut, and is cut in batches in the main blade side cutting area 2093. Then, the arc enters the main blade main cutting area 2092 and is cut by the relatively protruding main blade wide arm cutting convexes 2014 of two adjacent grid blades, thereby extinguishing. Thus, batch cutting and extinguishing of the arc in the second arc extinguishing group 2 are realized, and the difficulty of arc cutting and extinguishing is reduced.

[0055] As Figure 3As shown, a sub - blade cutting body 103 is provided on one side of the sub - cutting blade 10 close to the end cover 8. From the sub - blade cutting body 103 towards the contact blade group 7, the sub - cutting blade 10 naturally extends the sub - blade wide arm 101 and the sub - blade narrow arm 102 on the left and right sides respectively. On the side of the sub - blade wide arm 101 facing the center line 1090 of the sub - cutting blade, from the sub - blade cutting body 103 towards the contact blade group 7, the sub - blade wide - arm concave edge 1015, the sub - blade wide - arm cutting convex 1014, the sub - blade wide - arm concave 1013, the sub - blade wide - arm hypotenuse 1012, and the sub - blade wide - arm edge 1011 are arranged in natural transition in sequence. On the side of the sub - blade narrow arm 102 facing the center line 1090 of the sub - cutting blade, from the sub - blade cutting body 103 towards the contact blade group 7, the sub - blade narrow - arm concave edge 1024, the sub - blade narrow - arm cutting convex 1023, the sub - blade narrow - arm hypotenuse 1022, and the sub - blade narrow - arm edge 1021 are arranged in natural transition in sequence. The sub - blade wide - arm concave edge 1015 and the sub - blade narrow - arm concave edge 1024 are relatively matched to jointly form the main cutting area 1092 of the sub - blade. The sub - blade wide - arm concave edge 1015 is closer to the center line 1090 of the sub - cutting blade than the sub - blade narrow - arm concave edge 1024. The sub - blade wide - arm concave 1013 and the sub - blade narrow - arm cutting convex 1023 are relatively matched, and the sub - blade wide - arm hypotenuse 1012 and the sub - blade narrow - arm hypotenuse 1022 are relatively matched to jointly form the side cutting area 1093 of the sub - blade. The sub - blade narrow - arm cutting convex 1023 is closer to the center line 1090 of the sub - cutting blade than the sub - blade wide - arm concave 1013, and the sub - blade wide - arm hypotenuse 1012 is closer to the center line 1090 of the sub - cutting blade than the sub - blade narrow - arm hypotenuse 1022. For several sub - cutting blades 10 that make up the first arc - extinguishing group 1 and the first arc - extinguishing group 3, the adjacent sub - cutting blades 10 are arranged by rotating 180 degrees around the center line 1090 of the sub - cutting blade. Therefore, the sub - blade wide - arm cutting convexes 1014 of the adjacent two grid blades in the main cutting area 1092 of the sub - blade are opposite to each other. In the side cutting area 1093 of the sub - blade, the sub - blade narrow - arm cutting convex 1023 protrudes closer to the center line 1090 of the sub - cutting blade relative to the sub - blade wide - arm concave 1013 of the adjacent sub - cutting blade 10; the sub - blade wide - arm hypotenuse 1012 protrudes closer to the center line 1090 of the sub - cutting blade relative to the sub - blade narrow - arm hypotenuse 1022 of the adjacent sub - cutting blade 10. During the breaking process of the circuit breaker, the formed arc first enters the side cutting area 1093 of the sub - blade. In this area, it preferentially contacts the protruding sub - blade wide - arm hypotenuse 1012 and the sub - blade narrow - arm cutting convex 1023 and is cut, and then contacts the recessed sub - blade narrow - arm hypotenuse 1022 and the sub - blade wide - arm concave 1013 and is cut, and is cut in batches in the side cutting area 1093 of the sub - blade. Then, the arc enters the main cutting area 1092 of the sub - blade and is cut by the relatively protruding sub - blade wide - arm cutting convexes 1014 of the adjacent two grid blades, thus extinguishing. In this way, the arc is cut and extinguished in batches in the first arc - extinguishing group 1 and the third arc - extinguishing group 3, reducing the difficulty of arc cutting and extinguishing.

[0056] Figure 6As shown in the figure, several mounting grooves 604 are provided on the left and right sides of the insulating shell 6 in a one-to-one correspondence. Positioning ribs 6041 are provided on both sides of the mounting groove 604. The width of the mounting groove 604 matches the thickness of the main cutting blade 20 and the auxiliary cutting blade 10. Mounting holes 6042 are provided on the mounting groove 604. The position and size of the mounting holes 6042 are coupled with the main blade mounting convex 206 of the main cutting blade 20 and the auxiliary blade mounting convex 106 of the auxiliary cutting blade 10. On the side of the insulating shell 6 facing the contact blade group 7, a first protective shell 601 is provided on the left and right near the first arc ignition plate 4, a third protective shell 603 is provided on the left and right near the second arc ignition plate 5, and a second protective shell 602 is provided in the middle on the left and right. The first protective shell 601, the second protective shell 602, and the third protective shell 603 on the same side are naturally connected and transitioned in sequence. The main cutting blade 20 and the auxiliary cutting blade 10 are placed in the corresponding mounting grooves 604, and the main blade mounting convex 204 of the main cutting blade 20 and the auxiliary blade mounting convex 104 of the auxiliary cutting blade 10 pass through the mounting holes 6042 to realize the installation and positioning of the main cutting blade 20 and the auxiliary cutting blade 10 in the insulating shell 6. Among them, the main blade wide arm 201 and the main blade narrow arm 202 of the main cutting blade 20 are placed inside the second protective shell 602 of the insulating shell 6, and the second protective shell 602 insulates and protects the main blade wide arm edge 2011 and the main blade narrow arm edge 2021; the auxiliary blade wide arm 101 and the auxiliary blade narrow arm 102 of the auxiliary cutting blade 10 are placed inside the first protective shell 601 and the third protective shell 603 of the insulating shell 6, and the first protective shell 601 and the third protective shell 603 protect the auxiliary blade wide arm edge 1011 and the auxiliary blade narrow arm edge 1021.

[0057] As Figures 8 to 9 , when the circuit breaker breaks the fault current, it is a schematic diagram of the process of arc cutting each arc extinguishing group. The contact blade group 7 and the conducting member 9 start to separate from the fit, and an arc is generated between them. The arc moves in the direction of the arc extinguishing group under the attraction of each arc extinguishing group. At this time, one end of the arc adheres to the tip of the contact blade group 7, and the other end of the arc leaves the conducting member 9 under the attraction of each arc extinguishing group, and then moves along the jump plate 402, the connecting plate 403, and the fixed arc plate 404 of the first arc ignition plate 4 to the first arc extinguishing group 1 in sequence. As the contact blade group 7 further moves away from the conducting member 9, the arc is further stretched. At this time, the arc enters the auxiliary blade side cutting area 1093 and the auxiliary blade main cutting area 1092 of the first arc extinguishing group 1, and the main blade side cutting area 2093 and the main blade main cutting area 2092 of the second arc extinguishing group 2 in sequence, and is cut by the grid blades in batches.

[0058] Figure 9As shown, the contact piece group 7 moves to the termination position, and the distance between the contact piece group 7 and the conduction piece 9 reaches the maximum. At this time, the arcing arm 7102 of the long contact piece 71 of the contact piece group 7 reaches the secondary piece side cutting area 1093 of the third arc extinguishing group 3 from the main piece side cutting area 2093 of the second arc extinguishing group 2, and at the same time enters the local magnetic enhancement area 50 of the second arc guiding plate 5. At this time, the arcing arm 7102 maintains a distance less than or equal to 5 mm from the contact plate 501, and the arc thereon will contact the contact plate 501 of the second arc guiding piece 5, and then elongate from the contact plate 501 to the fixed arc plate 404. In this process, in addition to cutting with the main cutting piece 20 in the second arc extinguishing group 2, it further extends to the first arc extinguishing group 1 and cuts with the secondary cutting piece 10 in the first arc extinguishing group 1. After the arc cuts with the second arc extinguishing group 2 and the first arc extinguishing group 1 in sequence, under the magnetic enhancement effect of the local magnetic enhancement area 50, the arc further extends from the tip of the arcing arm 7102 of the long contact piece 71 of the contact piece group 7 through the contact plate 501 of the second arc guiding piece 5 to the third arc extinguishing group 3, so as to realize sufficient cutting of the arc with the cutting pieces of each arc extinguishing group. By sequentially cutting each arc extinguishing group instead of cutting simultaneously, the difficulty of the arc cutting into the arc extinguishing group is reduced.

[0059] As described above, only the preferred embodiments of the present invention are provided, and there is no limitation in any form and substance to the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the premise of the present invention, several improvements and supplements can still be made, and these improvements and supplements should also be regarded as the protection scope of the present invention. Those who are familiar with this professional technology, without departing from the spirit and scope of the present invention, when making some minor changes, modifications and equivalent changes in evolution using the technical content disclosed above, are all equivalent embodiments of the present invention; at the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the substantial technology of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A contact arc extinguishing system, comprising a first arc extinguishing group (1), a second arc extinguishing group (2), a third arc extinguishing group (3), a first arc striking plate (4), a second arc striking plate (5), an insulating shell (6), a contact piece group (7), a conducting member (9), and an end cover (8); The contact piece group (7) is opposite to the conductive member (9); the first arc extinguishing group (1), the second arc extinguishing group (2), and the third arc extinguishing group (3) are placed in the insulating shell (6); the first arc extinguishing group (1), the second arc extinguishing group (2), and the third arc extinguishing group are placed behind the contact piece group (7); an end cover (8) is installed behind the first arc extinguishing group (1), the second arc extinguishing group (2), and the third arc extinguishing group (3); the first arc striking plate (4) is closely attached to the conductive member (9), and the first arc striking plate (4) is placed below the first arc extinguishing group (1); the second arc striking plate (5) is placed above the third arc extinguishing group (3); the first arc extinguishing group (1) and the third arc extinguishing group (3) are composed of a plurality of auxiliary cutting plates (10); the second arc extinguishing group (2) is composed of a plurality of main cutting plates (20); It is characterized in that A contact plate (501) is provided at one end of the second arc-starting plate (5) facing the contact piece group (7); Magnetization plates (504) are provided on both sides of the contact plate (501) of the second arc-starting plate (5), and surround the contact plate (501) to form a local magnetization area (50).

2. A contact arc extinguishing system according to claim 1, characterized in that: An extension plate (503) is provided at one end of the second arc-starting plate (5) facing the third arc-extinguishing group (3); the extension plate (503) is placed at the upper end of the third arc-extinguishing group (3); the extension plate (503) is arranged in parallel with the auxiliary cutting plate (10) of the third arc-extinguishing group (3); The extension plate (503) is bent toward the center of one end of the contact sheet group (7) to form a contact plate (501); The extension plate (503) is bent on both sides of the contact plate (501) at one end of the contact sheet group (7) to form a transition plate (502); The transition plate (502) is bent toward the contact plate (501) to form a magnetizing plate (504); The magnetization plate (504) and the contact plate (501) surround a local magnetization area (50).

3. A contact arc extinguishing system according to claim 1, characterized in that: One end of the conductive member (9) facing the contact group (7) is a contact section (901); a static main contact (904) and a static auxiliary contact (905) are fixed on one side of the contact section (901) facing the contact group (7); One end of the conducting member (9) away from the contact group (7) is a connecting section (903); the connecting section (903) and the contact section (901) are arranged vertically; The connecting section (903) and the contact section (901) are naturally connected via an inclined transition section (902).

4. A contact arc extinguishing system according to claim 1, characterized in that: A long contact piece (71) is arranged in the center of the contact piece group (7); a plurality of second contact pieces (72) and a plurality of short contact pieces (73) are arranged in sequence on both sides of the contact piece group (7); A moving main contact (7103) and a moving auxiliary contact (7104) are provided on one side of the long contact piece (71) facing the conducting member (9); the moving main contact (7103) is opposite to the static main contact (904); the moving auxiliary contact (7104) is opposite to the static auxiliary contact (905); the long contact piece (71) automatically transitions the auxiliary contact (7104) to the second arc-starting plate (5) to extend an arcing arm (7102); A second main contact (7203) and a second auxiliary contact (7204) are provided on the side of the second contact piece (72) facing the conducting member (9); the second main contact (7203) is opposite to the static main contact (904); the second auxiliary contact (7204) is opposite to the static auxiliary contact (905); A third main contact (7303) is provided on the side of the short contact piece (73) facing the conducting member (9); the third main contact (7303) is opposite to the static main contact (904).

5. A contact arc extinguishing system according to claim 1, characterized in that: An inclined mounting plate (401) is provided on one end of the first arc-starting plate (4) facing the conducting member (9); the mounting plate (401) is fitted with a transition section (902) of the conducting member (9); The first arc-starting plate (4) is bent from the mounting plate (401) toward the contact piece group (7) to form a jump plate (402); the jump plate (402) is level with the contact section (901) on the conducting member (9); the jump plate (402) is closely attached to the auxiliary contact (905) and level; An arc-fixing plate (404) is provided at one end of the first arc-starting plate (4) facing the first arc-extinguishing group (1); the arc-fixing plate (404) is placed below the first arc-extinguishing group (1); the arc-fixing plate (404) is arranged in parallel with the auxiliary cutting plate (10) of the first arc-extinguishing group (1); The jump plate (402) and the arc fixing plate (404) are naturally transitionally connected via an inclined connecting plate (403); The first arc-starting plate (4) is bent from the mounting plate (401) away from the contact piece group (7) to form a fixing plate (405).

6. A contact arc extinguishing system according to claim 1, characterized in that: A main cutting body (203) is provided on one side of the main cutting sheet (20) close to the end cover (8); The main cutting blade (20) naturally transitions from the main blade cutting body (203) toward the contact blade group (7) to form a main blade wide arm (201) and a main blade narrow arm (202) on the left and right sides; The main piece wide arm (201) is naturally transitioned in sequence from the main piece cutting body (203) to the contact piece group (7) on one side facing the main cutting piece center line (2090), and includes a main piece wide arm concave edge (2015), a main piece wide arm cutting convexity (2014), a main piece wide arm concave edge (2013), a main piece wide arm oblique edge (2012), and a main piece wide arm edge (2011); The main piece narrow arm (202) is naturally transitioned from the main piece cutting body (203) to the contact piece group (7) on one side of the main piece narrow arm (202) facing the main cutting piece center line (2090), and is provided with a main piece narrow arm concave edge (2024), a main piece narrow arm cutting convex edge (2023), a main piece narrow arm bevel edge (2022), and a main piece narrow arm edge (2021); The main piece wide arm concave edge (2015) and the main piece narrow arm concave edge (2024) are relatively matched and together form the main piece main cutting area (2092), and the main piece wide arm concave edge (2015) is closer to the main cutting piece center line (2090) than the main piece narrow arm concave edge (2024); The main piece wide arm concave (2013) is relatively matched with the main piece narrow arm cutting convex (2023), and the main piece wide arm bevel (2012) is relatively matched with the main piece narrow arm bevel (2022), and together they form a main piece side cutting area (2093); the main piece narrow arm cutting convex (2023) is closer to the main cutting piece center line (2090) than the main piece wide arm concave (2013), and the main piece wide arm bevel (2012) is closer to the main cutting piece center line (2090) than the main piece narrow arm bevel (2022).

7. A contact arc extinguishing system according to claim 1, characterized in that: A secondary cutting piece cutting body (103) is provided on a side of the secondary cutting piece (10) close to the end cover (8); The auxiliary cutting piece (10) naturally transitions from the auxiliary cutting body (103) to the contact piece group (7), with the left and right sides respectively extending to form an auxiliary piece wide arm (101) and an auxiliary piece narrow arm (102); The side of the secondary piece wide arm (101) facing the secondary cutting piece center line (1090) is naturally transitioned from the secondary piece cutting body (103) to the contact piece group (7) and is provided with a secondary piece wide arm concave edge (1015), a secondary piece wide arm cutting convexity (1014), a secondary piece wide arm concave (1013), a secondary piece wide arm oblique edge (1012), and a secondary piece wide arm edge (1011); The side of the secondary piece narrow arm (102) facing the secondary cutting piece center line (1090) is naturally transitioned from the secondary piece cutting body (103) to the contact piece group (7) and is provided with a secondary piece narrow arm concave edge (1024), a secondary piece narrow arm cutting convex edge (1023), a secondary piece narrow arm bevel edge (1022), and a secondary piece narrow arm edge (1021); The secondary piece wide arm concave edge (1015) and the secondary piece narrow arm concave edge (1024) are relatively matched and together form the secondary piece main cutting area (1092), and the secondary piece wide arm concave edge (1015) is closer to the secondary cutting piece center line (1090) than the secondary piece narrow arm concave edge (1024); The secondary piece wide arm concave (1013) is relatively matched with the secondary piece narrow arm cutting convex (1023), and the secondary piece wide arm bevel (1012) is relatively matched with the secondary piece narrow arm bevel (1022), and together they form a secondary piece side cutting area (1093); the secondary piece narrow arm cutting convex (1023) is closer to the secondary cutting piece center line (1090) than the secondary piece wide arm concave (1013), and the secondary piece wide arm bevel (1012) is closer to the secondary cutting piece center line (1090) than the secondary piece narrow arm bevel (1022).

8. A contact arc extinguishing system according to claim 1, characterized in that: A plurality of mounting grooves (604) corresponding to each other are provided on the left and right sides of the insulating shell (6); On one side of the insulating shell (6) facing the contact group (7), a first protective shell (601) is arranged near the first arc-starting plate (4), a third protective shell (603) is arranged near the second arc-starting plate (5), and a second protective shell (602) is arranged in the middle; the first protective shell (601), the second protective shell (602), and the third protective shell (603) on the same side are naturally connected and transitioned in sequence.

9. A contact arc extinguishing system according to claim 6, characterized in that: The main plate wide arm (201) and the main plate narrow arm (202) of the main cutting plate (20) are placed inside the second protective shell (602) of the insulating shell (6).

10. A contact arc extinguishing system according to claim 7, characterized in that: The auxiliary sheet wide arm (101) and the auxiliary sheet narrow arm (102) of the auxiliary cutting sheet (10) are placed inside the first protective shell (601) and the third protective shell (603) of the insulating shell (6).

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