Arc striking device of circuit breaker

Abstract

An arc striking device of a circuit breaker comprises an arc striking part installed on a busbar, the arc striking part is integrally formed and comprises an arc striking piece, a static contact part and a first base, and the arc striking piece comprises a first installation part and a first bending part; the arc striking device further comprises an insulating plate installed on one side of the arc striking part, the insulating plate comprises an arcing baffle, a second base and a supporting table connected between the arcing baffle and the second base, the supporting table is of an inclined plane structure, a receding hole is formed between the supporting table and the second base, and the arc striking part is sleeved with the insulating plate through the receding hole. A first installation part of the arc striking part is attached to an arcing baffle of the insulating plate, the supporting table is located on the lower portion of a first bending part of the arc striking part and attached to the first bending part, the first installation part and the first bending part are located on the outer side of the insulating plate, the static contact part is attached to the inner side of the second base, and the static contact part and the first base are located on the inner side of the insulating plate. The electric connector is convenient to install and better in insulativity.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrical technology field, concretely relates to an arc striking device of circuit breaker. BACKGROUND

[0002] The circuit breaker includes a moving contact and a stationary contact, and an arc is generated at the moment when the moving contact and the stationary contact are in contact or disconnected. Therefore, the existing circuit breaker is usually provided with an arc extinguishing chamber corresponding to the contact area of the moving contact and the stationary contact to extinguish the arc. In addition, an insulating sheet is usually arranged between the moving contact and the stationary contact to further prevent the arc.

[0003] In the prior art, the covering area of the insulating sheet is small, the insulation performance is poor, and the installation mode of the insulating sheet and the moving contact or / and the stationary contact is complex and not firm. The insulating sheet is easy to fall off during use. UTILITY MODEL CONTENTS

[0004] The utility model aims at overcoming the defects of the prior art and providing an arc striking device of circuit breaker which is easy to install and has better insulation performance.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] In the first aspect, the utility model provides an arc striking device of circuit breaker, including arc striking part installed on busbar, arc striking part is integrally formed, including arc striking sheet, stationary contact part and first base, arc striking sheet includes first installation part and first bending part, first installation part, first bending part, stationary contact part and first base are sequentially connected in bending,

[0007] The first base includes a first base, the first base is fixedly connected with the busbar, the first installation part and the stationary contact part are arranged in parallel, the first bending part is arranged in an inclined manner and connected between the first installation part and the stationary contact part, and the first base is arranged perpendicularly to the stationary contact part.

[0008] The arc striking device further includes an insulating plate installed on one side of the arc striking part, the insulating plate is integrally formed and includes an arc striking baffle, a second base, and a support table connected between the arc striking baffle and the second base in the form of an inclined surface structure, a clearance hole is arranged between the support table and the second base, and the insulating plate is sleeved on the arc striking part through the clearance hole.

[0009] The first mounting portion of the arc striking component is attached to the arc striking baffle of the insulating plate, the support platform is located at the lower part of the first bending portion of the arc striking component and is attached to the first bending portion, the first mounting portion and the first bending portion are located at the outer side of the insulating plate, the stationary contact portion is attached to the inner side of the second base, and at least part of the stationary contact portion corresponds to the accommodation hole, and the stationary contact portion and the first base are located at the inner side of the insulating plate.

[0010] In a possible implementation, the arc striking baffle is provided with a first groove in the middle, and the first mounting portion of the arc striking component is embedded in the first groove.

[0011] In a possible implementation, the first groove is provided with a first mounting structure, and the first mounting portion of the arc striking component is provided with a second mounting structure matched with the first mounting structure.

[0012] In a possible implementation, the first bending portion is provided with an arc striking groove in the shape of a long strip in the direction from the stationary contact portion to the first mounting portion, and the two ends of the arc striking groove are respectively partially extended to the first mounting portion and the stationary contact portion of the arc striking component.

[0013] In a possible implementation, two limiting platforms are further included, and the two limiting platforms are arranged on the two sides of the accommodation hole.

[0014] In a possible implementation, the two limiting platforms are symmetrically arranged on the two sides of the accommodation hole, and the two surfaces of the two limiting platforms, which are opposite to the accommodation hole, are in the shape of an inclined plane.

[0015] In a possible implementation, the first base is further provided with a third mounting structure, the busbar is provided with a fourth mounting structure matched with the third mounting structure, the first base further includes a first side wall bently connected to the first base, and the first base, the first side wall and the stationary contact portion are connected to form a U-shaped structure.

[0016] In a possible implementation, the first side wall supports the two limiting platforms of the arc striking component.

[0017] In a possible implementation, a metal plate is further included, and the metal plate is connected to the stationary contact portion in the accommodation hole.

[0018] In a possible implementation, the second base is provided with a plurality of long-strip-shaped bosses, the plurality of long-strip-shaped bosses are horizontally spaced, are perpendicular to the mounting direction of the insulating plate and the busbar, and are located between the busbar and the accommodation hole.

[0019] In a possible implementation, the length of the long-strip-shaped boss is not less than the length of the second base.

[0020] In a possible implementation, the length of the first base of the arc striking component is less than the width of the busbar, the arc striking component is mounted on the busbar, the first base of the arc striking component has a first empty area relative to the busbar, and the second base comprises a second bottom surface, and a second limiting plate is arranged on the second bottom surface of the second base of the insulating plate, and the second limiting plate is arranged in the first empty area to limit the mounting of the insulating plate.

[0021] In a possible implementation, the first base is located at the middle of the width direction of the busbar, and first empty areas are left on both sides of the first base in the length direction, and second limiting plates are arranged on both ends of the second bottom surface of the second base of the insulating plate in the length direction.

[0022] In a possible implementation, the insulating plate is made of an insulating gas generating material.

[0023] In a second aspect, the application provides a circuit breaker, comprising the arc striking device of any of the circuit breakers described above, and further comprising a moving contact and an arc extinguishing chamber, the arc extinguishing chamber comprises a plurality of arc extinguishing vanes, the arrangement of the arc extinguishing vanes corresponds to the movement trajectory of the moving contact, and the arc extinguishing vanes divide the arc extinguishing area in the arc extinguishing chamber into a plurality of arc running channels and arc extinguishing channels.

[0024] The arc striking device of the circuit breaker comprises an arc striking component and an insulating plate mounted on one side of the arc striking component to shield the arc striking component from discharging to the shielding side, the insulating plate has better insulation performance and a wider shielding area; the arc striking component comprises an integrally formed arc striking sheet, a static contact part and a first base, the arc striking sheet, the static contact part and the first base are arranged as an integral whole, integrally formed, have higher structural strength, are simple in structure, save parts, are convenient to install and have better conductivity;

[0025] The insulating plate comprises an arc burning baffle, a second base and a support table connected between the arc burning baffle and the second base in a slope structure, the arc burning baffle is arranged on one side of the arc striking component and completely shields the arc striking component so that the arc striking component cannot discharge to the shielding side, the second base is used for mounting and fixing with the busbar, the support table is attached to the first bent part of the arc striking component, the support table and the first bent part support and limit each other, a gap is arranged between the support table and the second base, the insulating plate is conveniently passed through the gap and then rotatably sleeved on the arc striking component, and installation is convenient; the first mounting part and the first bent part are located on the outside of the insulating plate, and the static contact part and the first base are located on the inside of the insulating plate, without a complex buckle structure, but the installation of the insulating plate and the arc striking component is similar to the buckle structure, installation is convenient, the structure is firm, and the insulating plate is difficult to fall off in the use process.

[0026] Further, by arranging multiple long strip-shaped bosses and spacing the multiple bosses, the length of the second base in the vertical direction is increased, the distance of arc creeping is increased, the electrical gap is improved, and the arc entering the arc striking groove is prevented from being guided downward to the busbar in the vertical direction.

[0027] Further, when the insulating plate is installed on the arc striking component, a metal plate is arranged on the static contact head, the metal plate can limit the insulating plate and can be used as the static contact point to contact and cooperate with the moving contact, and welding the metal plate is more conducive to arc striking.

[0028] Further, by arranging a second limiting plate on the second base of the insulating plate, the arc striking component is installed on the busbar to leave a first empty area, and the second limiting plate is arranged in the first empty area, so that the busbar supports the insulating plate in the vertical direction.

[0029] Further, by arranging a first side wall on the first base of the arc striking device, the first side wall, the first base and the static contact head form a U-shaped structure, the first side wall and the first base support the insulating plate in the vertical direction, and the structure is more stable after installation.

[0030] Further, the insulating plate is made of an insulating gas generating material, when the static contact head and the moving contact are in contact or disconnected to generate an arc, the arc will burn the insulating plate to generate gas, the generated gas can cool the arc and drive the arc to move towards the arc extinguishing chamber, so that the arc is extinguished by the arc extinguishing chamber. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1a and Figure 1b is a structural schematic view of the arc striking device of the circuit breaker of the utility model;

[0032] Figure 2 is a structural schematic view of the back of the arc striking device of the circuit breaker of the utility model;

[0033] Figure 3a and Figure 3b is a structural schematic view of the arc striking component of the utility model;

[0034] Figure 4a 、 Figure 4b and Figure 4c is a structural schematic view of the insulating plate of the utility model;

[0035] Figure 5 is an assembly schematic view of the arc striking device of the utility model;

[0036] Figure 6 is a schematic view of the arc striking device of the utility model after assembly;

[0037] In the figure: busbar 101; arc striking component 1; arc striking piece 11; static contact portion 12; first base 13; first mounting portion 14; first bending portion 15; first base 131; insulating plate 2; arc striking baffle 21; second base 22; support table 23; clearance hole 24; second bottom surface 222; first recess 25; first mounting structure 251; second mounting structure 252; arc striking groove 16; limiting table 26; third mounting structure 132; first side wall 133; metal plate 3; boss 221; first empty area 134; second limiting plate 223. DETAILED DESCRIPTION

[0038] The embodiments described below in conjunction with the drawings further illustrate the specific embodiments of the present application. The scope of protection of the present application is not limited to the description of the following embodiments.

[0039] The circuit breaker generally comprises a contact system, an arc extinguishing chamber, an operating mechanism and a shell, the contact system, the arc extinguishing chamber and the operating mechanism are arranged in the shell, the contact system comprises a moving contact and a static contact, the moving contact is rotationally arranged in the circuit breaker, the static contact is fixedly installed in the circuit breaker, the arc extinguishing chamber is arranged corresponding to the contact system, for extinguishing the electric arc generated when the moving contact and the static contact are connected or disconnected, the operating mechanism is connected with the moving contact, for driving the moving contact to swing and connect or disconnect with the static contact, a handle is arranged on the operating mechanism, which can be used for manual operation of the circuit breaker by the staff to make the circuit breaker open or close.

[0040] As shown in FIG. 1 and Figure 2 The present application provides an arc striking device of a circuit breaker, which comprises an arc striking component 1 mounted on a busbar 101, the arc striking component 1 is integrally formed and comprises an arc striking piece 11, a static contact portion 12 and a first base 13, the arc striking piece 11 comprises a first mounting portion 14 and a first bending portion 15, the first mounting portion 14, the first bending portion 15, the static contact portion 12 and the first base 13 are sequentially and bendingly connected along the vertical direction in Figure 1a The first base 13 is used for connecting with the busbar 101, the first base 13 comprises a first base 131, the first base 131 is fixedly connected with the busbar 101, the static contact portion 12 serves as a static contact for contacting with a moving contact, the arc striking piece 11 composed of the first mounting portion 14 and the first bending portion 15 is used for guiding the electric arc of the static contact, the first mounting portion 14 and the static contact portion 12 are arranged in parallel, the first bending portion 15 is arranged in an inclined manner and connected between the first mounting portion 14 and the static contact portion 12, the first base 131 is arranged perpendicularly with the static contact portion 12, the arc striking component 1 is composed of a metal material with good conductivity, for example, but not limited to, iron, copper or aluminum and the like.

[0041] The arc striking device of the circuit breaker further comprises an insulating plate 2 installed in cooperation with the arc striking component 1, the insulating plate 2 is installed on one side of the arc striking component 1 and can completely shield the arc striking component 1 from discharging to the shielding side, the insulating plate 2 comprises an arc striking baffle 21, a second base 22 and a support table 23 connected to the inclined surface structure between the arc striking baffle 21 and the second base 22, the support table 23 is in close contact with the first bending part 15 of the arc striking component 1, the first bending part 15 limits the arc striking component 1, and the support table 23 and the second base 22 are provided with a clearance hole 24, and the insulating plate 2 is sleeved on the arc striking component 1 through the clearance hole 24. Figure 1a As shown in the figure, the first installation part 14 of the arc striking component 1 is in close contact with the arc striking baffle 21 of the insulating plate 2, the support table 23 is located at the lower part of the first bending part 15 of the arc striking component 1 and is in close contact with the first bending part 15, the first installation part 14 and the first bending part 15 are located on the outer side of the insulating plate 2, the stationary contact part 12 is in close contact with the inner side of the second base 22, at least part of the stationary contact part 12 corresponds to the clearance hole 24, and the stationary contact part 12 and the first base 13 are located on the inner side of the insulating plate 2. The second base 22 comprises a second bottom surface 222, the second bottom surface 222 is connected to the busbar 101 in a vertical manner, and in general, the arc striking component 1 and the insulating plate 2 are perpendicular to the busbar 101 in a vertical direction.

[0042] The arc striking device of the circuit breaker comprises the arc striking component 1 and the insulating plate 2 installed on one side of the arc striking component 1 and capable of shielding the arc striking component 1 from discharging to the shielding side, the insulating plate 2 has better insulation performance and a wider shielding area.

[0043] The arc striking component comprises an integrally formed arc striking sheet 11, a stationary contact part 12 and a first base, the arc striking sheet, the stationary contact part and the first base are arranged as an integral whole and integrally formed, the structure is higher in strength, simpler in structure, parts are saved, installation is convenient, and the conductivity is better.

[0044] The insulating plate 2 comprises an arc striking baffle 21, a second base 22 and a support table 23 connected to the inclined surface structure between the arc striking baffle 21 and the second base 22, the arc striking baffle 21 is arranged on one side of the arc striking component 1 and completely shields the arc striking component 1 from discharging to the shielding side, the second base 22 is used for being installed and fixed to the busbar 101, the support table 23 is in close contact with the first bending part 15 of the arc striking component 1, the support table 23 and the first bending part 15 support and limit each other, the clearance hole 24 is arranged between the support table 23 and the second base 22, the insulating plate 2 is sleeved on the arc striking component 1 through the clearance hole 24, and installation is convenient.

[0045] The first mounting portion 14 and the first bending portion 15 are located at the outer side of the insulating plate 2, and the static contact portion 12 and the first base 13 are located at the inner side of the insulating plate 2. The mounting of the insulating plate 2 and the arc striking component 1 is similar to a buckle type structure, convenient to mount, firm in structure, and difficult to fall off in use.

[0046] It should be noted that the insulating plate 2 can be integrally formed or formed by late splicing and mounting, both of which belong to the protection scope of the application.

[0047] Preferably, the arc burning baffle 21 is a square structure, and of course, according to actual requirements, the arc burning baffle 21 can also be but is not limited to other polygonal structures. The square structure of the arc burning baffle 21 can cover a larger shielding area, and the insulation effect is better.

[0048] Preferably, as shown in Figure 1a The middle part of the arc burning baffle 21 is provided with a first groove 25 in the vertical direction, and the first mounting portion 14 of the arc striking component 1 is embedded into the first groove 25.

[0049] Further, the first groove 25 is provided with a first mounting structure 251, and the first mounting portion 14 of the arc striking component 1 is provided with a second mounting structure 252 matched with the first mounting structure 251.

[0050] The first mounting structure 251 and the second mounting structure 252 are both hole structures, but one side of the second mounting structure 252 relative to the first mounting structure 251 is a hollow conical structure protruding outward. The conical structure can be clamped into the second mounting structure 252 to achieve clamping limiting. When the first mounting structure 251 and the second mounting structure 252 are clamped and locked, a first mounting shaft can be further arranged to pass through the first mounting structure 251 and the second mounting structure 252 to be further mounted and fixed, which can be more firmly fixed. The first mounting shaft can be a screw and a nut, a rivet, or other similar mounting structures.

[0051] Preferably, the first bending portion 15 is provided with an arc striking groove 16 in the direction from the static contact portion 12 to the first mounting portion 14. Further, the two ends of the arc striking groove 16 respectively partially extend to the first mounting portion 14 and the static contact portion 12 of the arc striking component 1. The arc striking groove 16 is in the shape of a long waist circle hole, and the two ends are in the shape of a circular arc. The arc striking groove 16 in the direction from the static contact portion 12 to the first mounting portion 14 of the first bending portion 15, and the two ends of the arc striking groove 16 respectively partially extending to the first mounting portion 14 and the static contact portion 12 of the arc striking component 1 facilitate arc striking.

[0052] Preferably, as shown in Figure 4a , Figure 4band Figure 4c As shown, the arc-starting device of the circuit breaker also includes two limiting platforms 26, which are disposed on both sides of the clearance hole 24. The arc-starting component 1 can... Figure 1a The vertical support limiting platform 26 is located in the middle.

[0053] Furthermore, the two limiting platforms 26 are symmetrically arranged on both sides of the relief hole 24, and the two limiting platforms 26 opposite to the relief hole 24 have an inclined structure.

[0054] Preferred, such as Figure 3a and Figure 3b As shown, a third mounting structure 132 is provided on the first base 131 of the arc-initiating component 1, and a corresponding fourth mounting structure is provided on the busbar 101; the first base 13 also includes a first sidewall 133 bent and connected to the first base 131, the first base 131, the first sidewall 133 and the stationary contact head 12 are connected to form a U-shaped structure with an open upper end, the U-shaped structure can support the limiting platform, and the insulating plate 2 can be placed on the U-shaped structure. During this process, the first sidewall 133 and the first base 131 are in... Figure 1a The vertical force is applied in the middle, while the static contact head 12 is not subjected to vertical force. In other feasible methods, the first sidewall 133 may not be provided, and all of these fall within the protection scope of this application.

[0055] like Figure 1a As shown, when the insulating plate 2 is installed on the arc-starting component 1, the upper edge of the first sidewall 133 contacts the bottom surface of the limiting platform 26 of the insulating plate 2, supporting the limiting platform 26.

[0056] Preferred, such as Figure 1b As shown, the first sidewall 133, the stationary contact head 12, and the first mounting part 14 are arranged parallel to each other. By setting the first sidewall 133, the first sidewall 133, the first base 131, and the stationary contact head 12 form a U-shaped structure with an open top. The two limiting platforms 26 of the insulating plate 2 can be placed on the U-shaped structure. The U-shaped structure can support the insulating plate 2 in the vertical direction, and the installation structure is stable.

[0057] Preferred, such as Figure 1a and Figure 1bAs shown, the arc-ignition device of the circuit breaker also includes a metal plate 3, which is connected to the stationary contact head 12 and can serve as a stationary contact. Alternatively, the metal plate 3 can be omitted. When the insulating plate 2 is installed on the arc-ignition component 1, the metal plate 3 is located within the clearance hole 24 and connected to the stationary contact head 12, with the metal plate 3 positioned between the two limiting platforms 26. The metal plate 3 can be, but is not limited to, a square structure; for example, it can also be a circular structure. In a preferred embodiment, the shape of the metal plate 3 can be precisely fitted into the clearance hole 24 for better fit. The metal plate 3 serves both to limit the insulating plate 2 and as a stationary contact point for contact with the moving contact. Welding the metal plate 3 further facilitates arc ignition.

[0058] The metal plate 3 can be installed on the stationary contact head 12 by welding, or it can be fixed by riveting or other methods.

[0059] Preferably, the installed metal plate 3 does not exceed the outer surface of the second base 22. When the metal plate 3 is installed on the arc-starting component 1, the upper edge of the metal plate 3 is flush with the lower edge of the arc-starting groove 16 of the arc-starting component 1, so as not to affect the smooth entry of the electric arc into the arc-starting groove 16.

[0060] Preferred, such as Figure 1a , Figure 4a , Figure 4b and Figure 4c As shown, the second base 22 is provided with a plurality of elongated protrusions 221. The plurality of elongated protrusions 221 are arranged horizontally at intervals, and their horizontal direction is perpendicular to the installation direction of the insulating plate 2 and the busbar 101. The protrusions 221 are located between the busbar 101 and the clearance hole 24, thereby increasing the creepage distance of the arc between the busbar 101 and the arc-starting groove 16.

[0061] Furthermore, the length of the elongated protrusion 221 is not less than the length of the second base 22, and the multiple spaced elongated protrusions 221 make the surface of the second base 22... Figure 1a The second base 22 has a vertically oriented concave-convex structure. By providing multiple elongated protrusions 221 spaced apart, the vertical length of the second base 22 is increased, thereby increasing the arc creepage distance, improving the electrical clearance, and preventing the arc entering the arc-initiating groove 16 from being drawn vertically downwards to the busbar 101. Of course, in a less desirable embodiment, the protrusions 221 may not be provided on the second base 22, which is also within the scope of protection of this application.

[0062] Preferred, Figure 5 and Figure 6 The diagram shows the installation method of the arc-initiating component 1, the insulating plate 2, and the busbar 101, as well as a schematic diagram of the state after installation.Figure 5 and Figure 6 As shown in the figure, the first base 13 of the arc striking component 1 is along Figure 1a The length of the first base 13 in the horizontal direction is less than the width of the busbar 101, the arc striking component 1 is installed on the busbar 101, and the first base 13 of the arc striking component 1 has a first empty area 134 relative to the busbar 101. The second bottom surface 222 of the second base 22 of the insulating plate 2 is provided with a second limiting plate 223, which is placed in the first empty area 134 to limit the installation of the insulating plate 2. By matching the arc striking component 1 with the busbar, the first empty area 134 is left, the insulating plate 2 is provided with the second limiting plate 223, the second limiting plate 223 can just match the first empty area 134, and the busbar 101 supports the insulating plate 2 in the vertical direction through the first empty area 134, so that the insulating plate 2 is stably installed.

[0063] Further, the first base 13 is located in the middle of the width direction of the busbar 101, and the first base 13 has a first empty area 134 on both sides in the length direction. The second bottom surface 222 of the second base 22 of the insulating plate 2 protrudes to form the second limiting plate 223 at both ends in the length direction, and in addition, the front end of the second bottom surface 222 can be made into an edge angle, which hooks the front end of the busbar 101, as shown in the figure. In this way, the movement of the insulating plate 2 can be limited, and the installation is more stable. Figure 6

[0064] Preferably, the insulating plate 2 is made of insulating gas generating material. For example, the insulating gas generating material can be nylon, melamine, PA46, etc. The insulating plate 2 is arranged on one side of the arc striking component 1 containing the static contact part 12, close to the arc root of the electric arc. When the static contact part 12 and the moving contact are in contact or disconnected to generate an electric arc, the electric arc will burn the insulating plate 2 to generate gas, which can cool the electric arc and drive the electric arc to move towards the arc extinguishing chamber, so that the electric arc is extinguished by the arc extinguishing chamber.

[0065] Preferably, the third mounting structure 132 and the fourth mounting structure can both be mounting holes. In addition, the application can further include a locking component, which locks the third mounting structure 132 and the fourth mounting structure to fix the arc striking component 1 on the busbar 101. The locking component can be a combination of a screw and a nut, or a rivet. Of course, the third mounting structure 132 can be a mounting hole, and the fourth mounting structure can be a mounting shaft, which is fixed by shaft hole matching.

[0066] ​Preferably, this application provides a circuit breaker including the arc-initiating device of the circuit breaker described above. The circuit breaker includes the arc-extinguishing chamber (not shown in the figure), and the arc-extinguishing chamber includes multiple arc-extinguishing grids. The arrangement of the arc-extinguishing grids in the arc-extinguishing chamber roughly corresponds to the movement trajectory of the moving contact. The arc-extinguishing grids divide the arc-extinguishing area in the arc-extinguishing chamber into multiple independent arc-tracing and arc-extinguishing channels. The arc is divided into several parts by the arc-extinguishing grids to compress and cool the arc, thereby reducing the arc energy during breaking and improving the reliability of the circuit breaker breaking.

[0067] To gain a clearer understanding of this application, the installation method of the insulating plate 2 and the arc-starting component 1 in this application will be described below.

[0068] like Figure 5 and Figure 6 As shown, firstly, the arc-initiating component 1 is vertically fixed to the busbar 101 via the first base 13. Then, the insulating plate 2 passes through the clearance hole 24 in its middle through the first mounting part 14 of the arc-initiating component 1, and is then rotated and fitted onto the arc-initiating component 1, so that the first mounting part 14 of the arc-initiating component 1 is placed in the first groove 25 of the insulating plate 2 and fits against it. The first bent part 15 of the arc-initiating component 1 is placed on the upper part of the support platform 23 of the insulating plate 2, and the first bent part 15 fits against the support platform 23. The stationary contact head 12 is placed inside the second base 22 and fits tightly against the inner side of the second base 22. The bottom surface of the limiting platform 26 abuts against the upper edge of the first side wall 133 of the arc-initiating component 1, and the first side wall 133 supports the insulating plate 2 vertically upward. The second base 22 of the insulating plate 2 is placed on the busbar 101, and the second limiting plate 223 of the second base 22 is placed in the first empty area 134. The busbar 101 supports the insulating plate 2 vertically upward. The insulating plate 2 has a support platform 23 that fits against the first bending portion 15 of the arc-starting component 1. The first bending portion 15 limits the insulating plate 2 downward in the vertical direction. The first mounting portion 14 of the arc-starting component 1 is placed in the first groove 25 of the insulating plate 2. The hollow conical structure protruding outward in the first mounting portion 14 is inserted into the hole-like structure in the first groove 25 to achieve locking. At the same time, the screw can be passed through the conical structure and the hole-like structure by the cooperation of screws and nuts to further fix the arc-starting component 1 and the insulating plate 2 to achieve a locking function. Finally, the metal plate 3 can be welded to the stationary contact head 12 between the two limiting platforms 26 of the insulating plate 2. It can serve as both the stationary contact point of the stationary contact head and the limiting point of the insulating plate 2. The insulating plate 2 and the arc-starting component 1 are both integrally formed structures. The installation of the two is similar to a snap-fit ​​structure, which is convenient to install, has a solid structure, does not require separate locking parts, and is firmly locked during use and difficult to fall off.

[0069] It should be noted that in the description of the present application, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings or the orientation or positional relationship commonly used in use, and are only for the convenience of description, and do not indicate that the device or element referred to must have a particular orientation, so it cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating relative importance.

[0070] The above is a further detailed description of the present application in combination with specific preferred embodiments, and cannot be considered as limiting the specific implementation of the present application to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, without departing from the concept of the present application, a number of simple deductions or substitutions can be made, which should be considered as falling within the protection scope of the present application.

Claims

1. An arc striking device of a circuit breaker, comprising an arc striking component (1) mounted on a busbar (101), the arc striking component (1) being integrally formed and comprising an arc striking sheet (11), a static contact portion (12) and a first base (13), the arc striking sheet (11) comprising a first mounting portion (14) and a first bent portion (15), the first mounting portion (14), the first bent portion (15), the static contact portion (12) and the first base (13) being sequentially and bently connected, characterized in that the first base (13) comprising a first base seat (131) fixedly connected with the busbar (101), the first mounting portion (14) and the static contact portion (12) being arranged in parallel, the first bent portion (15) being arranged in an inclined manner and connected between the first mounting portion (14) and the static contact portion (12), the first base seat (131) being arranged perpendicularly to the static contact portion (12); the arc striking device further comprising an insulating plate (2) mounted on one side of the arc striking component (1), the insulating plate (2) being integrally formed and comprising an arc burning baffle (21), a second base (22) and a support table (23) connected between the arc burning baffle (21) and the second base (22) in a slope structure, a clearance hole (24) being arranged between the support table (23) and the second base (22), the insulating plate (2) being sleeved on the arc striking component (1) through the clearance hole (24), the first mounting portion (14) of the arc striking component (1) being attached to the arc burning baffle (21) of the insulating plate (2), the support table (23) being located at a lower portion of the first bent portion (15) of the arc striking component (1) and attached to the first bent portion (15), the first mounting portion (14) and the first bent portion (15) being located outside the insulating plate (2), the static contact portion (12) being attached to an inner side of the second base (22), at least a portion of the static contact portion (12) corresponding to the clearance hole (24), the static contact portion (12) and the first base (13) being located inside the insulating plate (2).

2. The arc starter for circuit breakers according to claim 1, characterized in that a first groove (25) being arranged in a middle portion of the arc burning baffle (21), the first mounting portion (14) of the arc striking component (1) being embedded in the first groove (25).

3. The arc starter for circuit breakers according to claim 1, characterized in that the first bent portion (15) being provided with an arc striking groove (16) in a long strip shape along a direction from the static contact portion (12) to the first mounting portion (14), both ends of the arc striking groove (16) being partially extended to the first mounting portion (14) and the static contact portion (12) of the arc striking component (1) respectively.

4. The arc starter for circuit breakers according to claim 1, characterized in that two limiting tables (26) are further included, the two limiting tables (26) being arranged on both sides of the clearance hole (24); the two limiting tables (26) being symmetrically arranged on both sides of the clearance hole (24) and being in a slope structure on two sides opposite to the clearance hole (24).

5. The arc starter for circuit breakers according to claim 4, characterized in that The first base (131) is provided with a third mounting structure (132), and the busbar (101) is provided with a fourth mounting structure corresponding to the third mounting structure; the first base (13) further comprises a first side wall (133) which is connected to the first base (131) in a bent manner, and the first base (131), the first side wall (133) and the static contact part (12) are connected to form a U-shaped structure.

6. The arc starter for circuit breakers according to claim 5, characterized in that The first side wall (133) supports two limiting tables (26) of the arc striking component (1).

7. The arc starter for circuit breakers according to claim 1, characterized in that A metal plate (3) is further included, and the metal plate (3) is connected to the static contact part (12) in the clearance hole (24).

8. The arc starter for circuit breakers according to claim 1, characterized in that The second base (22) is provided with a plurality of long-strip-shaped bosses (221), and the plurality of long-strip-shaped bosses (221) are arranged horizontally and spaced apart, and the mounting direction of the busbar (101) and the insulating plate (2) is perpendicular, and the bosses (221) are located between the busbar (101) and the clearance hole (24).

9. The arc starter for circuit breakers according to claim 1, characterized in that The length of the first base (13) of the arc striking component (1) is less than the width of the busbar (101), the arc striking component (1) is mounted on the busbar (101), and the first base (13) of the arc striking component (1) has a first empty area (134) relative to the busbar (101), the second base (22) comprises a second bottom surface (222), the second bottom surface (222) of the second base (22) of the insulating plate (2) is provided with a second limiting plate (223), the second limiting plate (223) is arranged in the first empty area (134), and the installation limiting of the insulating plate (2) is realized; the first base (13) is located in the middle of the width direction of the busbar (101), and the first base (13) has a first empty area (134) on both sides in the length direction, and the second bottom surface (222) of the second base (22) of the insulating plate (2) is provided with a second limiting plate (223) on both ends in the length direction.

10. A circuit breaker characterized by, The arc striking device of the circuit breaker comprises the arc striking device of any one of claims 1-9, further comprising a moving contact and an arc extinguishing chamber, the arc extinguishing chamber comprises a plurality of arc extinguishing grids, the arrangement of the arc extinguishing grids corresponds to the movement track of the moving contact, and the arc extinguishing grids divide the arc extinguishing area in the arc extinguishing chamber into a plurality of arc striking and arc extinguishing channels.

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