Contact arc extinguishing device and circuit breaker

Abstract

The utility model belongs to the technical field of low-voltage electric appliances, and discloses a contact arc extinguishing device and a circuit breaker. The contact arc extinguishing device comprises a static contact, a magnetic conductive member and a first arc striking angle. The static contact comprises a static conductive plate; the first arc striking angle is arranged on the magnetic conductive piece and forms a clamping groove with the magnetic conductive piece through bending, and the static conductive plate is clamped in the clamping groove. The first arc striking angle of the contact arc extinguishing device is connected with the static conductive plate through the clamping groove formed by the first arc striking angle and the magnetic conductive piece, so that the connection reliability between the first arc striking angle and the static contact is improved, and the arc extinguishing performance of the circuit breaker is further improved.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and in particular to a contact arc extinguishing device and a circuit breaker. Background Technology

[0002] A circuit breaker is a circuit protection device that provides overload, short-circuit, and undervoltage protection. When a circuit fault occurs, the moving contact separates from the stationary contact to cut off the circuit. An electric arc is generated when the moving and stationary contacts separate; to assist in extinguishing the arc, an arc-starting angle is typically provided on the stationary contact.

[0003] Currently, the arc-starting angle is generally connected to the stationary contact by riveting. Riveting has poor high-temperature resistance and is prone to loosening and failure under high-temperature conditions, which can cause the arc-starting angle to become skewed or even fall off, affecting the arc-extinguishing performance of the circuit breaker.

[0004] Therefore, there is an urgent need to propose a contact arc extinguishing device and circuit breaker to solve the above-mentioned technical problems. Utility Model Content

[0005] According to one aspect of the present invention, the present invention provides a contact arc extinguishing device, wherein the first arc-initiating angle is engaged with the stationary contact through a slot formed by the magnetic conductive element, thereby improving the connection reliability between the first arc-initiating angle and the stationary contact, and thus improving the arc extinguishing performance of the circuit breaker.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The contact arc extinguishing device includes:

[0008] Stationary contacts, including stationary conductive plates;

[0009] A magnetic conductive element and a first arc-leading angle are provided on the magnetic conductive element and are bent to form a slot with the magnetic conductive element. The static conductive plate is snapped into the slot.

[0010] Optionally, the magnetic conductive element and the first arc-leading angle both have protrusions on the wall surface of the slot, and the static conductive plate has grooves that correspond one-to-one with the protrusions, and the grooves engage with the protrusions.

[0011] Optionally, the contact arc extinguishing device further includes a connector that passes through the magnetic conductor, the static conductive plate, and the first arc-inducing angle to fix the magnetic conductor and the first arc-inducing angle on the static conductive plate.

[0012] Optionally, the static conductive plate is provided with a first connecting hole, the first arc-leading angle is provided with a second connecting hole, the magnetic conductive element is provided with a third connecting hole corresponding to the second connecting hole, and the connecting element is a rivet. The rivet passes through the first connecting hole, the second connecting hole and the third connecting hole to rivet the magnetic conductive element and the first arc-leading angle to the static conductive plate.

[0013] Optionally, the static conductive plate includes a contact end, a static contact is provided on a first surface of the contact end, and the magnetic conductive element is located on a second surface of the contact end, with the second surface being disposed opposite to the first surface;

[0014] The first arc-inducing angle includes a bending section, a mounting section, and an arc-inducing section. One end of the bending section is connected to the magnetic conductor and is located on one side of the end of the magnetic conductor. The other end of the bending section is connected to the mounting section. The mounting section is located on the first surface and forms the slot with the magnetic conductor. The side of the mounting section away from the stationary contact is connected to the arc-inducing section. The arc-inducing section and the mounting section are set at an angle.

[0015] Optionally, the first arc-leading angle and the magnetic conductive element form an integral structure.

[0016] Optionally, an arc-blocking component is also installed on the static conductive plate to prevent the electric arc from moving towards the moving contact.

[0017] Optionally, the static conductive plate includes a contact end, and the arc-blocking member and the magnetic conductive member are respectively located on a first surface and a second surface opposite to the contact end;

[0018] The magnetic conductive component is bent at one end near the arc-isolating component to form a first connecting segment and a second connecting segment that are arranged opposite to each other. The first connecting segment has snap-fit ​​edges on opposite sides, and the second connecting segment has limiting openings that correspond one-to-one with the snap-fit ​​edges.

[0019] The arc-blocking component has elastic buckles on its opposite sides. The elastic buckles engage with the corresponding snap-fit ​​edge and extend into the limiting opening corresponding to the snap-fit ​​edge.

[0020] Optionally, a stationary contact is provided on the first surface of the contact end, and a notch is provided at one end of the arc-blocking member near the stationary contact, with part of the stationary contact placed in the notch.

[0021] Optionally, the contact arc-extinguishing device further includes an arc-extinguishing chamber, which is disposed above the stationary contact, and the arc-extinguishing chamber includes:

[0022] Multiple arc-extinguishing grids are provided, and the multiple arc-extinguishing grids are arranged at intervals.

[0023] Side arc-extinguishing plates are disposed on both sides of the plurality of arc-extinguishing grid plates;

[0024] An arc-extinguishing shroud, wherein the top wall of the arc-extinguishing shroud is located above the plurality of arc-extinguishing grids, and the side walls of the arc-extinguishing shroud are located behind the plurality of arc-extinguishing grids.

[0025] Optionally, the top wall of the arc-extinguishing shroud is sealed and tightly fitted to the cover of the circuit breaker.

[0026] Optionally, the inner top wall of the arc extinguishing shroud is provided with a buffer surface, which can abut against the buffer surface when the moving contact is separated from the stationary contact.

[0027] Optionally, the arc-extinguishing shroud has a positioning part on its side wall, which is inserted between two adjacent arc-extinguishing grid plates.

[0028] Optionally, the top of the plurality of arc-extinguishing grid plates is provided with an upper arc-isolating plate, and the upper arc-isolating plate is provided with a downwardly bent second arc-leading angle on the side near the top wall of the arc-extinguishing cover.

[0029] According to another aspect of the present invention, the present invention also provides a circuit breaker, including a housing and a contact arc extinguishing device as described in any of the above technical solutions, wherein the contact arc extinguishing device is disposed within the housing.

[0030] The beneficial effects of this utility model are:

[0031] This invention provides a contact arc-extinguishing device, including a stationary contact, a magnetic conductive element, and a first arc-starting angle. The first arc-starting angle is disposed on the magnetic conductive element and bent to form a groove with it, within which a stationary conductive plate is snapped. That is, both the first arc-starting angle and the magnetic conductive element are fixed to the stationary contact by snap-fitting, resulting in a simple structure and easy assembly. Furthermore, compared to the prior art where the first arc-starting angle and magnetic conductive element are fixed by riveting, the snap-fit ​​connection is less prone to loosening under high temperatures, providing higher connection strength and improving the reliability of the connection between the first arc-starting angle and the stationary contact, as well as between the magnetic conductive element and the stationary contact, thereby improving the arc-extinguishing performance of the circuit breaker.

[0032] This utility model also provides a circuit breaker, including a housing and the aforementioned contact arc-extinguishing device. Because this circuit breaker employs the aforementioned contact arc-extinguishing device, its arc-extinguishing performance and operational safety are both superior. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the contact arc extinguishing device provided in this embodiment of the utility model;

[0035] Figure 2 This is an assembly drawing of a stationary contact, a magnetic conductive element, and a first arc-leading angle provided in an embodiment of this utility model;

[0036] Figure 3 This is a schematic diagram of the cooperation between a magnetic conductive element and a first arc-drawing angle provided in an embodiment of this utility model;

[0037] Figure 4 This is a schematic diagram of the structure of a stationary contact provided in an embodiment of the present utility model;

[0038] Figure 5 This is an assembly diagram of another stationary contact, magnetic conductor, and first arc-leading angle from one perspective provided by an embodiment of this utility model;

[0039] Figure 6 This is an assembly diagram of another stationary contact, magnetic conductor, and first arc-leading angle from another perspective provided by an embodiment of this utility model;

[0040] Figure 7 This is an exploded view of another stationary contact, magnetic conductor, and first arc-leading angle provided in an embodiment of the present invention;

[0041] Figure 8 This is a schematic diagram of the cooperation between another magnetic conductive component and the first arc-drawing angle provided in an embodiment of this utility model;

[0042] Figure 9 This is a schematic diagram of the arc-blocking component provided in an embodiment of the present invention;

[0043] Figure 10 This is a partial cross-sectional view of the contact arc extinguishing device provided in this embodiment of the present invention installed inside the circuit breaker housing;

[0044] Figure 11 This is a schematic diagram of the arc-extinguishing chamber provided in an embodiment of the present invention;

[0045] Figure 12 This is a schematic diagram of the structure of the upper arc-blocking grid provided in this embodiment of the utility model;

[0046] Figure 13 This is a schematic diagram of the arc-extinguishing shield provided in this embodiment of the utility model;

[0047] Figure 14 This is a cross-sectional view of the arc-extinguishing chamber provided in an embodiment of this utility model.

[0048] In the picture:

[0049] 10. Moving contact; 20. Cover;

[0050] 100. Stationary contact; 101. Contact end; 110. Stationary conductive plate; 111. First connecting hole; 112. Groove; 120. Stationary contact point;

[0051] 200. Magnetic conductor; 201. First connecting section; 2011. Snap-fit ​​edge; 202. Second connecting section; 2021. Limiting opening; 210. Third connecting hole;

[0052] 300, First arc-leading angle; 301, Slot; 3011, Protrusion; 310, Bending section; 320, Mounting section; 330, Arc-leading section; 340, Second connecting hole;

[0053] 400. Connectors;

[0054] 500. Arc-blocking component; 510. Elastic buckle; 520. Notch;

[0055] 600. Arc extinguishing chamber; 610. Arc extinguishing grid plate; 620. Side arc diaphragm plate; 630. Arc extinguishing cover; 631. Buffer surface; 632. Positioning part; 640. Upper arc diaphragm plate; 641. Second arc-starting angle. Detailed Implementation

[0056] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0057] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0058] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0059] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0060] This embodiment provides a contact arc extinguishing device, wherein the first arc-initiating angle is engaged with the stationary contact through a slot formed by the magnetic conductive element, thereby improving the connection reliability between the first arc-initiating angle and the stationary contact and thus improving the arc extinguishing performance of the circuit breaker.

[0061] Specifically, such as Figures 1-4 As shown, the contact arc extinguishing device includes a stationary contact 100, a magnetic conductive element 200, and a first arc-starting angle 300.

[0062] The stationary contact 100 includes a stationary conductive plate 110. A first arc-starting angle 300 is disposed on the magnetically conductive component 200 and, through bending, forms a slot 301 with the magnetically conductive component 200. The stationary conductive plate 110 is snapped into the slot 301. That is, both the first arc-starting angle 300 and the magnetically conductive component 200 are fixed to the stationary contact 100 by snap-fitting, resulting in a simple structure and easy assembly. Furthermore, compared to the prior art where the first arc-starting angle 300 and the magnetically conductive component 200 are fixed by riveting, the snap-fit ​​connection method is less prone to loosening under high temperatures, resulting in higher connection strength. This improves the connection reliability between the first arc-starting angle 300 and the stationary contact 100, and between the magnetically conductive component 200 and the stationary contact 100, thereby improving the arc-extinguishing performance of the circuit breaker.

[0063] Further, see also Figures 2-4The magnetic conductive element 200 and the first arc-leading angle 300 both form a groove 301 with protrusions 3011 on their respective walls. The stationary conductive plate 110 has grooves 112 that correspond one-to-one with the protrusions 3011, and the grooves 112 engage with the protrusions 3011. The cooperation between the protrusions 3011 and the grooves 112 further improves the reliability of the connection between the stationary conductive plate 110 and the groove 301, thereby improving the reliability of the connection between the first arc-leading angle 300 and the stationary contact 100, as well as between the magnetic conductive element 200 and the stationary contact 100.

[0064] Optionally, such as Figures 5-8 As shown, the contact arc extinguishing device also includes a connector 400, which passes through the magnetic conductor 200, the static conductive plate 110 and the first arc-inducing angle 300 to fix the magnetic conductor 200 and the first arc-inducing angle 300 on the static conductive plate 110.

[0065] Specifically, the arc-extinguishing device has a dual connection structure between the first arc-starting angle 300 and the stationary conductive plate 110, and between the magnetic conductive element 200 and the stationary conductive plate 110. The first connection structure is the engagement of the slot 301 formed by the first arc-starting angle 300 and the magnetic conductive element 200 with the stationary conductive plate 110. The second connection structure is the connection between the connector 400 and the first arc-starting angle 300, the magnetic conductive element 200, and the stationary conductive plate 110. This design ensures that even if the connector 400 becomes loose under high-temperature conditions, the engagement will maintain the position of the first arc-starting angle 300 and the magnetic conductive element 200, improving the reliability of the connections between the first arc-starting angle 300 and the stationary contact 100, and between the magnetic conductive element 200 and the stationary contact 100, thereby enhancing the arc-extinguishing performance of the circuit breaker. Furthermore, this dual connection structure requires only one connector 400, simplifying the number of components and facilitating assembly.

[0066] Optionally, see [link to relevant documentation] Figure 7 and Figure 8 The static conductive plate 110 has a first connecting hole 111, the first arc-leading angle 300 has a second connecting hole 340, and the magnetic conductive component 200 has a third connecting hole 210 corresponding to the second connecting hole 340. The connector 400 is a rivet, which passes through the first connecting hole 111, the second connecting hole 340, and the third connecting hole 210 to rivet the magnetic conductive component 200 and the first arc-leading angle 300 onto the static conductive plate 110. The connection between the magnetic conductive component 200, the first arc-leading angle 300, and the static conductive plate 110 is achieved by riveting, which facilitates assembly.

[0067] Optionally, the first arc-starting angle 300 and the magnetic conductive component 200 form an integral structure, which facilitates processing and assembly. Furthermore, the connection strength between the first arc-starting angle 300 and the magnetic conductive component 200 is high, which helps reduce the risk of the first arc-starting angle 300 detaching.

[0068] Further, see also Figures 6-8 In this embodiment, the static conductive plate 110 includes a contact end 101, which includes a first surface and a second surface disposed opposite to each other. A static contact 120 is provided on the first surface, and the magnetic conductive element 200 is located on the second surface. Furthermore, the first arc-extinguishing angle 300 includes a bending section 310, a mounting section 320, and an arc-extinguishing section 330. One end of the bending section 310 is connected to the magnetic conductive element 200 and located on one side of the end of the magnetic conductive element 200. The other end of the bending section 310 is connected to the mounting section 320. The mounting section 320 is located on the first surface and forms a groove 301 with the magnetic conductive element 200. The side of the mounting section 320 away from the static contact 120 is connected to the arc-extinguishing section 330, and the arc-extinguishing section 330 and the mounting section 320 are arranged at an angle. This contact arc-extinguishing device has a simple and compact structure and is easy to assemble.

[0069] In this embodiment, the second connecting hole 340 is disposed on the mounting section 320 of the first arc-leading angle 300.

[0070] Furthermore, such as Figures 5-7 , Figure 9 and Figure 10 As shown, the contact arc extinguishing device also includes an arc-blocking component 500, which is used to prevent the electric arc from moving towards the moving contact 10.

[0071] Optionally, the arc isolation component 500 is generally made of a material that can rapidly decompose and generate gas under the action of a high-temperature electric arc, such as hydrogen or carbon dioxide. These gases can blow the electric arc away from the moving contact 10 to prevent the electric arc from burning the moving contact 10.

[0072] Optionally, the material of the arc-blocking component 500 can be polyamide, polyester, thermosetting material, etc.

[0073] Further, see also Figure 5 , Figures 8-10 In this embodiment, the arc-blocking member 500 is located on the first surface of the contact end 101 of the static conductive plate 110, and a static contact 120 is provided between the arc-blocking member 500 and the arc-leading segment 330 of the first arc-leading angle 300.

[0074] Furthermore, the end of the magnetic conductor 200 near the arc-blocking member 500 is bent to form a first connecting section 201 and a second connecting section 202 that are arranged opposite to each other. The first connecting section 201 has snap-fit ​​edges 2011 on both sides, and the second connecting section 202 has limiting openings 2021 that correspond one-to-one with the snap-fit ​​edges 2011. The arc-blocking member 500 has elastic buckles 510 on both sides, which snap into their corresponding snap-fit ​​edges 2011 and extend into the limiting openings 2021 corresponding to the snap-fit ​​edges 2011. This design serves several purposes. First, the engagement between the arc-isolating component 500 and the snap-fit ​​edge 2011 not only enables the installation of the arc-isolating component 500 but also improves the stability of the magnetic component 200 installation. Second, the limiting opening 2021 limits the elastic buckle 510, thereby restricting the movement of the arc-isolating component 500 and improving the stability of the arc-isolating component 500 installation. Third, the longer length of the magnetic component 200 enhances its magnetic conductivity.

[0075] Optionally, see [link to relevant documentation] Figure 5 , Figure 6 and Figure 9 The first surface of the contact end 101 is provided with a stationary contact 120, and the end of the arc-blocking member 500 near the stationary contact 120 is provided with a notch 520, with part of the stationary contact 120 placed inside the notch 520. This arrangement makes the arc-blocking member 500 surround the stationary contact 120, improving the arc-blocking effect. In addition, the stationary contact 120 can also limit the arc-blocking member 500 to a certain extent.

[0076] Furthermore, such as Figure 1 , Figure 10 and Figure 11 As shown, the arc-extinguishing device also includes an arc-extinguishing chamber 600, which is positioned above the stationary contact 100 to extinguish the arc generated when the stationary contact 100 and the moving contact 10 are disconnected. Specifically, the arc-extinguishing chamber 600 includes arc-extinguishing grid plates 610, side arc-isolating plates 620, and an arc-extinguishing cover 630. Multiple arc-extinguishing grid plates 610 are provided, spaced apart. The side arc-isolating plates 620 are located on both sides (left and right sides) of the multiple arc-extinguishing grid plates 610. The side walls of the arc-extinguishing cover 630 are located behind the multiple arc-extinguishing grid plates 610, and the top wall of the arc-extinguishing cover 630 is located above the multiple arc-extinguishing grid plates 610.

[0077] Furthermore, such as Figure 10 and Figure 11 As shown, the top wall of the arc-extinguishing cover 630 is sealed and tightly fitted to the cover 20 of the circuit breaker. This arrangement can prevent the high-speed, high-temperature gas generated during the breaking process between the moving contact 10 and the stationary contact 100 from impacting the cover 20 and causing damage to the cover 20.

[0078] Optionally, see [link to relevant documentation] Figure 10The inner top wall of the arc-extinguishing cover 630 is provided with a buffer surface 631, which can abut against the moving contact 10 when it separates from the stationary contact 100. By providing the buffer surface 631, the contact area between the moving contact 10 and the arc-extinguishing cover 630 is increased when the moving contact 10 separates from the stationary contact 100, which can prevent the moving contact 10 from bending and protect the moving contact 10.

[0079] Furthermore, in one possible embodiment, the arc-extinguishing shield 630 is made of a material with elastic properties. This arrangement allows the buffer surface 631 to absorb a portion of the repulsive force of the moving contact 10, thus providing better protection for the moving contact 10. In other possible embodiments, an elastic layer can also be attached to the buffer surface 631 to absorb the repulsive force of the moving contact 10. The specific arrangement can be determined according to actual needs, and this application does not impose any particular limitation.

[0080] Optionally, such as Figure 13 and Figure 14 As shown, a positioning part 632 is provided on the side wall of the arc-extinguishing cover 630, and the positioning part 632 is inserted between two adjacent arc-extinguishing grid plates 610. The arc-extinguishing cover 630 is installed through the cooperation of the positioning part 632 and the arc-extinguishing grid plates 610. The structure is simple and easy to assemble.

[0081] Furthermore, multiple positioning parts 632 can be provided to improve the installation stability of the arc-extinguishing cover 630. In this embodiment, two positioning parts 632 are provided, and the two positioning parts 632 are located on the same horizontal plane, that is, the two positioning parts 632 are inserted between two identical arc-extinguishing grid plates 610. In other embodiments, the number and arrangement of positioning parts 632 can also be other, depending on actual needs, and this application does not make specific limitations.

[0082] Furthermore, such as Figure 10 and Figure 11 As shown, an upper arc-isolating plate 640 is provided on the top of the multiple arc-extinguishing grid plates 610. The upper arc-isolating plate 640 has a downwardly bent second arc-initiating angle 641 on the side near the top wall of the arc-extinguishing cover 630. By setting the second arc-initiating angle 641, the arc can be initiated and extinguished more effectively, which is beneficial to improving the breaking capacity of the circuit breaker.

[0083] Optionally, in this embodiment, the two ends of the second arc-leading angle 641 are respectively connected to two side arc-blocking plates 620.

[0084] This embodiment also provides a circuit breaker, including a housing and the aforementioned contact arc extinguishing device, wherein the contact arc extinguishing device is disposed inside the housing.

[0085] Because of the aforementioned contact arc-extinguishing device, this circuit breaker has excellent arc-extinguishing performance and safety.

[0086] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. Contact arcing device, characterized in that include: A stationary contact (100) includes a stationary conductive plate (110); A magnetic conductor (200) and a first arc-leading angle (300) are provided on the magnetic conductor (200) and are bent to form a slot (301) with the magnetic conductor (200). The static conductive plate (110) is snapped into the slot (301).

2. The contact arc extinguishing device according to claim 1, characterized in that The magnetic conductive component (200) and the first arc-leading angle (300) both have protrusions (3011) on the wall surface of the slot (301), and the static conductive plate (110) has grooves (112) that correspond one-to-one with the protrusions (3011), and the grooves (112) engage with the protrusions (3011).

3. The contact arc extinguishing device according to claim 1, characterized in that The contact arc extinguishing device further includes a connector (400), which passes through the magnetic conductor (200), the static conductive plate (110) and the first arc-starting angle (300) to fix the magnetic conductor (200) and the first arc-starting angle (300) on the static conductive plate (110).

4. The contact arc extinguishing device according to claim 3, characterized in that The static conductive plate (110) is provided with a first connecting hole (111), the first arc-leading angle (300) is provided with a second connecting hole (340), the magnetic conductive component (200) is provided with a third connecting hole (210) corresponding to the second connecting hole (340), the connecting component (400) is a rivet, the rivet passes through the first connecting hole (111), the second connecting hole (340) and the third connecting hole (210) to rivet the magnetic conductive component (200) and the first arc-leading angle (300) onto the static conductive plate (110).

5. The contact arc extinguishing device of claim 1, wherein, The static conductive plate (110) includes a contact end (101), a static contact (120) is provided on the first surface of the contact end (101), and the magnetic conductive element (200) is located on the second surface of the contact end (101), the second surface being disposed opposite to the first surface; The first arc-leading angle (300) includes a bending section (310), a mounting section (320), and an arc-leading section (330). One end of the bending section (310) is connected to the magnetic conductor (200) and located on one side of the end of the magnetic conductor (200). The other end of the bending section (310) is connected to the mounting section (320). The mounting section (320) is located on the first surface and forms the slot (301) with the magnetic conductor (200). The side of the mounting section (320) away from the stationary contact (120) is connected to the arc-leading section (330). The arc-leading section (330) and the mounting section (320) are set at an angle.

6. The contact arc extinguishing device of claim 1, wherein, The first arc-leading angle (300) and the magnetic conductive element (200) form an integral structure.

7. The contact arc extinguishing device of claim 1, wherein An arc-blocking component (500) is also installed on the static conductive plate (110), which is used to prevent the electric arc from moving towards the moving contact (10).

8. The contact arc extinguishing device according to claim 7, characterized in that The static conductive plate (110) includes a contact end (101), and the arc blocking member (500) and the magnetic conductive member (200) are respectively located on the first and second surfaces opposite to the contact end (101); The magnetic conductor (200) is bent at one end near the arc-blocking member (500) to form a first connecting section (201) and a second connecting section (202) arranged opposite to each other. The first connecting section (201) has snap-fit ​​edges (2011) on opposite sides, and the second connecting section (202) has limiting openings (2021) that correspond one-to-one with the snap-fit ​​edges (2011). The arc-blocking member (500) has elastic buckles (510) on its opposite sides. The elastic buckles (510) are engaged with the corresponding snap-fit ​​edge (2011) and extend into the limiting opening (2021) corresponding to the snap-fit ​​edge (2011).

9. The contact arc extinguishing device according to claim 8, characterized in that The first surface of the contact end (101) is provided with a stationary contact (120), and the arc blocking member (500) is provided with a notch (520) at one end near the stationary contact (120), and part of the stationary contact (120) is placed in the notch (520).

10. The contact arc extinguishing device according to any of claims 1-9, characterized in that, The contact arc-extinguishing device further includes an arc-extinguishing chamber (600), which is disposed above the stationary contact (100). The arc-extinguishing chamber (600) includes: Multiple arc-extinguishing grid plates (610) are provided, and the multiple arc-extinguishing grid plates (610) are spaced apart; Side arc-extinguishing plates (620) are disposed on both sides of the plurality of arc-extinguishing grid plates (610); An arc-extinguishing shield (630) is provided, the top wall of which is located above the plurality of arc-extinguishing grid plates (610), and the side walls of which are located behind the plurality of arc-extinguishing grid plates (610).

11. The contact arc extinguishing device according to claim 10, characterized in that The top wall of the arc extinguishing cover (630) is closed and tightly fitted to the cover (20) of the circuit breaker.

12. The contact arc extinguishing device of claim 10, wherein, The inner top wall of the arc extinguishing cover (630) is provided with a buffer surface (631), and the moving contact (10) can abut against the buffer surface (631) when it is separated from the stationary contact (100).

13. The contact arc extinguishing device of claim 10, wherein, The arc-extinguishing cover (630) has a positioning part (632) on its side wall, and the positioning part (632) is inserted between two adjacent arc-extinguishing grid plates (610).

14. The contact arc extinguishing device of claim 10, wherein, The top of the plurality of arc-extinguishing grid plates (610) is provided with an upper arc-blocking plate (640), and the upper arc-blocking plate (640) is provided with a downwardly bent second arc-leading angle (641) on the side near the top wall of the arc-extinguishing cover (630).

15. A circuit breaker characterized by It includes a housing and a contact arc-extinguishing device as described in any one of claims 1-14, wherein the contact arc-extinguishing device is disposed within the housing.

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