Arc extinguishing mechanism for circuit breaker and circuit breaking device

Abstract

Provided are an arc extinguishing mechanism for a circuit breaker and a circuit breaking device, the arc extinguishing mechanism comprising: an arc extinguishing chamber, a first arc leading plate, a second arc leading plate, and a first arc blowing coil, wherein a first end of the first arc leading plate is configured to be connected to a static contact support portion of the circuit breaker, and a second end extends to one side of the arc extinguishing chamber; a first end of the second arc leading plate is close to a moving contact area of the circuit breaker, and a second end extends to the other side of the arc extinguishing chamber opposite to the one side; a first end of the first arc blowing coil is connected to the static contact support portion, and a second end is configured to be electrically connected to a static contact side main circuit, wherein the first arc blowing coil is configured to drive an arc in the moving and static contact area and its vicinity towards the arc extinguishing chamber. The arc extinguishing mechanism can significantly improve the arc extinguishing capability of the circuit breaker.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breakers, specifically relating to an arc extinguishing mechanism and a circuit breaking device for circuit breakers. Background Technology

[0002] The statements in this section are merely to provide background information related to this utility model to aid in understanding it, and this background information does not necessarily constitute prior art.

[0003] Circuit breakers, as crucial control and protection devices in power distribution systems, can rapidly interrupt fault currents when overloads, short circuits, or other faults occur, protecting the power distribution system and electrical equipment. Among these, fault current breaking capacity is one of the most important performance evaluation indicators for circuit breakers. Currently, miniaturization of circuit breakers is a significant trend. Miniature circuit breakers (MCBs), also known as miniature circuit breakers, are the most common type of circuit breaker and are typically used in terminal power distribution.

[0004] Arc-extinguishing mechanisms are a key technology for ensuring that circuit breakers (including miniature circuit breakers) can safely and reliably interrupt fault currents and prevent accidents. Currently, the core challenge for DC high-voltage products during breaking lies in the arc dynamics characteristics. Existing circuit breakers suffer from insufficiently rapid arc transfer, long arcing time, and high breaking energy; furthermore, under critical current or electrical life conditions, arc stagnation can directly melt the contacts, which is a fundamental cause of product failure. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned defects of the prior art and provide an arc extinguishing mechanism for a circuit breaker, characterized in that it includes: an arc extinguishing chamber, a first arc-initiating plate, a second arc-initiating plate, and a first arc-blowing coil, wherein a first end of the first arc-initiating plate is configured to be connected to the stationary contact support of the circuit breaker, and a second end extends to one side of the arc extinguishing chamber; a first end of the second arc-initiating plate is close to the moving contact area of ​​the circuit breaker, and a second end extends to the opposite side of the arc extinguishing chamber; a first end of the first arc-blowing coil is connected to the stationary contact support, and a second end is configured to be electrically connected to the main circuit on the stationary contact side, wherein the first arc-blowing coil is configured to drive the arc in the moving and stationary contact areas and their vicinity toward the arc extinguishing chamber.

[0006] According to the arc-extinguishing mechanism of this utility model, preferably, the first arc-blowing coil is disposed in the moving and stationary contact area.

[0007] According to the arc-extinguishing mechanism of this utility model, preferably, the first arc-blowing coil includes a first oblique section, a first straight section and a second straight section that are parallel to each other, a bridging section, and a second oblique section, wherein the first oblique section is connected between the stationary contact support section and the first end of the first straight section; the first end of the second oblique section is configured to be electrically connected to the main circuit on the stationary contact side, and the second end is connected to the first end of the second straight section; the bridging section is connected between the second end of the first straight section and the second end of the second straight section.

[0008] According to the arc extinguishing mechanism of this utility model, preferably, it further includes a second arc-blowing coil, which is configured to drive the electric arc between the first arc-initiating plate and the second arc-initiating plate toward the arc extinguishing chamber.

[0009] According to the arc extinguishing mechanism of this utility model, preferably, the second arc blowing coil is disposed on the outer side of the second arc ignition plate away from the first arc ignition plate, the first end of the second arc blowing coil is connected to the first end of the second arc ignition plate, and the second end is configured to be electrically connected to the main circuit on the moving contact side.

[0010] According to the arc-extinguishing mechanism of this utility model, preferably, the first arc-initiating plate has a curved portion that bends toward the second arc-initiating plate.

[0011] According to the arc-extinguishing mechanism of this utility model, preferably, the curved portion includes an arc-shaped portion extending from the stationary contact support portion and a straight portion extending from the end of the arc-shaped portion away from the second arc-initiating plate.

[0012] According to the arc-extinguishing mechanism of this utility model, preferably, a magnetizing sheet is provided on the side of the curved portion away from the second arc-inducing plate, and the shape of the magnetizing sheet matches the shape of the curved portion.

[0013] According to the arc-extinguishing mechanism of this utility model, preferably, it further includes a gas-generating plate, which covers the area of ​​the moving and stationary contacts and the area between the first arc-initiating plate and the second arc-initiating plate.

[0014] On the other hand, the present invention also provides a circuit breaker device, which includes a circuit breaker and the aforementioned arc extinguishing mechanism according to the present invention.

[0015] Compared with the prior art, the arc extinguishing mechanism of this utility model is particularly suitable for miniature circuit breakers, which can improve the arc transfer speed, reduce the arc dwell time between contacts, and significantly improve the arc extinguishing capability of the circuit breaker. Attached Figure Description

[0016] The embodiments of this utility model will be further described below with reference to the accompanying drawings, wherein:

[0017] Figure 1 and Figure 2 The images are a plan view and a perspective view of a circuit breaker device according to an embodiment of the present invention.

[0018] Figure 3 and Figure 4 The images are respectively a plan view and a perspective view of a first arc-blowing coil and its connection relationship according to an embodiment of the present invention; and

[0019] Figure 5 and Figure 6 The images are a plan view and a perspective view of a second arc-blowing coil and its connection relationship according to an embodiment of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] An embodiment of this utility model provides a circuit breaker device, which includes a circuit breaker and an arc-extinguishing mechanism for the circuit breaker. See [link to relevant documentation]. Figure 1 and Figure 2 The diagram shows a plan view and a perspective view of a circuit breaker device according to an embodiment of the present invention.

[0022] The circuit breaker includes a first terminal 1001 and a second terminal 1002, a contact mechanism, an operating mechanism, and an electromagnetic mechanism. The first terminal 1001 and the second terminal 1002 are used to connect to an external circuit to form a main circuit. The contact mechanism includes a stationary contact 1003 and a moving contact 1004 for connecting and disconnecting the main circuit. Preferably, the stationary contact 1003 and the moving contact 1004 are respectively disposed on a corresponding stationary contact support 1005 and a moving contact support 1006. The operating mechanism 1007 (not fully shown in the figure) typically includes a connecting rod and a drive handle for driving the moving contact 1004 to close and open the moving and stationary contacts. The electromagnetic mechanism includes a coil 1008 and an armature 1009 for automatically triggering the operating mechanism 1007 to open the moving and stationary contacts and cut off the fault current when a fault occurs in the main circuit (such as a short circuit, overload, or undervoltage). Figure 1 The circuit breaker structure shown is merely an example of this invention. This invention can employ any other circuit breaker structure known in the art; for example, the electromagnetic mechanism can be replaced with other types of tripping mechanisms. Furthermore, the specific opening and closing operating principles of the circuit breaker are well known in the art and will not be elaborated upon here.

[0023] When the moving and stationary contacts 1004 and 1003 of the circuit breaker separate (i.e., the circuit is opened), an electric arc will be generated between the contacts due to the current breaking down the air (the temperature can reach thousands of degrees Celsius, which can burn the contacts, melt the parts, and even cause an explosion). The core function of the arc extinguishing mechanism is to quickly extinguish the electric arc and protect the equipment and circuit safety.

[0024] like Figure 1 and 2 As shown, the arc-extinguishing mechanism includes an arc-extinguishing chamber 2001, a first arc-initiating plate 2002, a second arc-initiating plate 2003, and a first arc-blowing coil 2004. The first end of the first arc-initiating plate 2002 is configured to be electrically connected to the stationary contact support 1005, and the second end extends to one side of the arc-extinguishing chamber 2001 (in...). Figure 1 (The middle is the upper side); the first end of the second arc-starting plate 2003 is close to the moving contact area, especially close to the opening position of the moving contact 1004, and the second end extends to the other side of the arc-extinguishing chamber 2001 (in Figure 1 (The middle is the lower side); the first arc-blowing coil 2004 is configured to drive the arc in and around the moving and stationary contact areas toward the arc-extinguishing chamber 2001. Preferably, as Figure 1 As shown, the first end of the first arc-blowing coil 2004 is connected to the stationary contact support 1005, and the second end is configured to be electrically connected to the main circuit 1 on the stationary contact side, that is, electrically connected to the first terminal 1001 of the circuit breaker connected to the stationary contact. The first arc-blowing coil 2004 is disposed in the moving and stationary contact area of ​​the circuit breaker. In this utility model, the "moving contact area" refers to the area where the moving contact is located, including the closing position, the opening position of the moving contact, and the position traversed by the moving contact during the opening switching process. The "moving and stationary contact area" refers to the functionally related area formed around the moving contact and the stationary contact, specifically covering the closing position, the opening position of the moving contact and the stationary contact, and the movement trajectory area traversed by the two during the closing and opening switching process. It should be noted that the scope of this area is not limited to the physical space occupied by the two components, the moving contact and the stationary contact, but rather extends into a larger area in three-dimensional space (length, width, and height directions) with the physical existence area of ​​the two as the core. This expanded area can completely cover the physical bodies of the moving and stationary contacts and the associated space of their motion trajectories. In particular, to reduce the size of the arc-extinguishing mechanism, such as... Figure 1 and 2 In the embodiment shown, the first arc-blowing coil 2004 is configured to be infinitely close to the moving contact 1004 and the stationary contact 1003 in the moving and stationary contact region, but without affecting the movement of the moving contact 1004.

[0025] During the opening process of the moving and stationary contacts 1004 and 1003, the electric arc between the moving and stationary contacts moves towards the arc-extinguishing chamber 2001 under the electromagnetic force of its own magnetic field. The arrangement of the first arc-extinguishing coil 2004 can increase the additional electromagnetic field, thereby increasing the electromagnetic force on the arc, accelerating the arc transfer speed, reducing arc stagnation, and improving contact erosion. Specifically, as... Figure 1 As shown, assuming the current direction in the main circuit flows from the stationary contact 1003 to the moving contact 1004, the direction of the arc current generated during the separation of the moving and stationary contacts in the moving-stationary contact region is from the stationary contact 1003 to the moving contact 1004. The current direction in the first arc-blowing coil 2004 flows from the main circuit 1 on the stationary contact side to the stationary contact support 1005, which is counterclockwise. According to the right-hand rule, the current in the first arc-blowing coil 2004 generates a magnetic field perpendicular to the paper and outwards. According to the left-hand rule, the magnetic field of the first arc-blowing coil 2004 exerts a downward electromagnetic force on the arc current, i.e., an electromagnetic force towards the arc-extinguishing chamber 2001. This additional electromagnetic force accelerates the arc transfer speed.

[0026] See Figure 3 and Figure 4 The plan view and perspective view of an embodiment of the present invention and its connection relationship are shown. The first arc-blowing coil 2004 includes a first oblique section 301, a first straight section 302 and a second straight section 303 that are parallel to each other, a bridging section 304, and a second oblique section 305. The first oblique section 301 is connected between the stationary contact support section 1005 and the first end of the first straight section 302. The first end of the second oblique section 305 is connected to an electrical connection section 306, which is configured to be electrically connected to the main circuit 1 on the stationary contact side or to the stationary contact side. A portion of the main circuit 1 or a portion of the first arc-blowing coil 2004 is connected to the second end of the second oblique portion 305. The second end of the second oblique portion 305 is connected to the first end of the second straight portion 303. The bridging portion 304 is connected between the second end of the first straight portion 302 and the second end of the second straight portion 303. Preferably, the position of the first end of the second oblique portion 305 is approximately flush with the position of the first end of the first straight portion 302. Preferably, the first end of the second oblique portion 305 is close to the first end of the first straight portion 302, so that the first arc-blowing coil 2004 forms an almost closed coil. The first arc-extinguishing coil 2004 in this embodiment is formed of an elongated metal plate with a small thickness and a large surface perpendicular to the thickness. The surfaces of the first straight portion 302, the second straight portion 303, the bridging portion 304, and the second oblique portion 305 are approximately in the same plane, which is approximately perpendicular to the surface of the first arc-extinguishing plate 2002. The first oblique portion 301 extends from the stationary contact position to the first straight portion 302, leaving space for the arrangement of the moving and stationary contacts. Thus, the resulting structure rationally utilizes the internal space of the arc-extinguishing mechanism, saving its volume. For example, with... Figure 3 The plane containing the paper is the xy-plane, with the x-axis pointing horizontally to the right, the y-axis pointing vertically upwards, and the z-axis perpendicular to the paper and pointing outwards, establishing a three-dimensional coordinate system. In this embodiment, the surfaces of the first straight section 302, the second straight section 303, the bridging section 304, and the second oblique section 305 lie in the xy-plane, while the surface of the first oblique section 301 lies in the yz-plane. In this embodiment, the first arc-blowing coil 2004 is formed by two independent parts joined together at the bridging section 304. Figure 4 As shown, the first part includes a first oblique section 301, a first straight section 302, and a first sub-bridging section 3041; the second part includes a second oblique section 305, a second straight section 303, and a second sub-bridging section 3042, wherein the first sub-bridging section 3041 and the second sub-bridging section 3042 are joined together (e.g., welded) to form a bridging section 304. Preferably, the first part and the second part are respectively formed by bending a metal plate.

[0027] In another embodiment, the first arc-blowing coil 2004 is an integral structure, preferably formed by bending a single elongated metal plate. In yet another embodiment, the first arc-blowing coil 2004, the stationary contact support 1005, the electrical connection 306, and the first arc-inducing plate 2002 form an integral structure, also preferably formed by bending a single elongated metal plate.

[0028] In another embodiment, the first arc-blowing coil 2004 can be a coil with more than one turn or less than one turn, such as a three-quarter turn coil or a half-turn coil.

[0029] In another embodiment, such as Figure 1 and 2 As shown, the first arc-starting plate 2002 includes a first curved portion that bends toward the second arc-starting plate 2003. Preferably, the curved portion includes an arcuate portion 2021 extending from the stationary contact support portion 1005 and a straight portion 2022 extending from the end of the arcuate portion 2021 away from the second arc-starting plate 2003. Furthermore, the first arc-starting plate 2002 also includes a first flat plate portion 2023 extending from the end of the straight portion 2022, which extends above the arc-extinguishing chamber 2001. The second arc-starting plate 2003 includes a second curved portion 2031 bending away from the first arc-starting plate 2002 and a second flat plate portion 2032 connected to the end of the second curved portion 2031 and extending below the arc-extinguishing chamber 2001.

[0030] An arc-running path 2005 is formed between the first arc-starting plate 2002 and the second arc-starting plate 2003. The first arc-starting plate 2002 and the second arc-starting plate 2003 can protect the contacts, guide the arc into the arc-extinguishing chamber, cool and lengthen the arc, and prevent phase-to-phase short circuits. Specifically, at the moment the arc is generated, the root (attachment point) of the arc is quickly transferred from the main contact to the arc-starting plate itself using electromagnetic force, thereby protecting the contacts; the contacts themselves are prevented from being directly burned and melted by the arc, greatly extending the electrical life of the contacts. The arc-starting plate extends into the arc-extinguishing chamber. After the arc root is transferred to the arc-starting plate, the entire arc will be rapidly lengthened and "blown" into the arc-extinguishing chamber along the "path" indicated by the arc-starting plate under the combined action of electromagnetic force and the upward force of hot air. Without the guidance of the arc-starting plate, the arc may run wildly and fail to enter the arc-extinguishing chamber. During the process of the electric arc moving and being guided on the surface of the arc-starting plate, it exchanges heat with the arc-starting plate, thereby reducing the arc temperature; at the same time, it elongates the arc from the extremely short gap between the contacts into a long arc, increasing the voltage drop of the arc and making it easier to extinguish.

[0031] In another embodiment, a magnetizing sheet 2007 matching the shape of the first curved portion is provided on the side of the first curved portion of the first arc-inducing plate 2002 away from the second arc-inducing plate 2003. This sheet is used to guide, concentrate, and enhance the magnetic field strength in the magnetic circuit, thereby significantly increasing the electromagnetic force and further accelerating the transfer speed of the electric arc.

[0032] In yet another embodiment, a second arc-blowing coil 2006 is provided on the side of the second arc-starting plate 2003 opposite to the first arc-starting plate 2002. See also Figure 5 and Figure 6 The diagram shows a plan view and a perspective view of the second arc-blowing coil 2006 and its connections in this embodiment. The first end of the second arc-blowing coil 2006 is connected to the first end of the second arc-initiating plate 2003, and the second end is configured to be electrically connected to the main circuit 2 on the moving contact side, that is, electrically connected to the second terminal 1002 of the circuit breaker connected to the moving contact. The second arc-blowing coil 2006 is configured to drive the arc in the area of ​​the arc-running track 2005 toward the arc-extinguishing chamber 2001. Preferably, the second arc-blowing coil 2006 has a generally triangular shape, including a first side 2061, a second side 2062, and a third side 2063. The first side 2061 extends downward from the first end of the second arc-inducing plate 2003 to the plane containing the second flat plate portion 2032 of the second arc-inducing plate 2003; the second side 2062 extends along the plane containing the second flat plate portion 2032 of the second arc-inducing plate 2003 to a position close to the second arc-inducing plate 2003; the third side 2063 extends upward parallel to the second curved portion 2031 of the second arc-inducing plate 2003 to a position close to the first end of the second arc-inducing plate 2003, and then passes behind the first side 2061 and connects to the moving contact side main circuit 2. Furthermore, the second arc-blowing coil 2006 is formed of a metal plate, such as... Figure 5 As shown, the surfaces of the metal plates on the first side 2061, the second side 2062, and the third side 2063 of the second arc-blowing coil 2006 are all perpendicular to the xy plane. This arrangement can effectively utilize the space outside the second arc-initiating plate 2003 and save the volume of the arc-extinguishing mechanism.

[0033] Specifically, such as Figure 5 As shown, assuming the current direction in the main circuit is from the stationary contact 1003 to the moving contact 1004, the arc current direction is from the first arc-initiating plate 2002 to the second arc-initiating plate 2003. In this case, the current direction in the second arc-blowing coil 2006 is clockwise from the first end of the second arc-initiating plate 2003, flowing through the second arc-blowing coil 2006 to the main circuit 2 on the moving contact side. According to the right-hand rule, the magnetic field inside the second arc-blowing coil 2006 is perpendicular to the paper and inwards, while the arc-running track 2005 is outside the second arc-blowing coil 2006, therefore, the magnetic field direction is perpendicular to the paper and outwards. According to the left-hand rule, the magnetic field of the second arc-blowing coil 2006 generates an electromagnetic force on the arc current pointing towards the arc-extinguishing chamber 2001, further accelerating the arc transfer speed and reducing arc stagnation.

[0034] Although the foregoing embodiments are described with the current direction of the main circuit flowing from the stationary contact 1003 to the moving contact 1004 as an example, even assuming that the current direction of the main circuit flows from the moving contact 1004 to the stationary contact 1003, in this case, both the first arc-blowing coil 2004 and the second arc-blowing coil 2006 will generate a current direction opposite to that of the foregoing embodiments, and the direction of the arc current will also be opposite to that of the foregoing embodiments. Therefore, the first arc-blowing coil 2004 and the second arc-blowing coil 2006 configured as described above can generate an electromagnetic force that drives the arc towards the arc-extinguishing chamber 2001.

[0035] According to another embodiment of this invention, the arc-extinguishing mechanism further includes a gas-generating plate that covers the areas of the moving and stationary contacts, as well as the area of ​​the arc-running track 2005 between the first arc-initiating plate 2002 and the second arc-initiating plate 2003. Under the high temperature of the electric arc, the gas-generating plate rapidly generates a large amount of gas to cool the arc. Furthermore, the gas generated by the gas-generating plate increases the pressure, further increasing the arc speed. Compared to conventional technologies, the larger gas-generating plate of this invention covers the entire area where an arc may exist, providing a more sufficient gas volume, a longer operating time, and a more comprehensive coverage area, achieving the goals of efficient arc extinguishing, preventing reignition, and adapting to high-current interruption.

[0036] According to another embodiment of this utility model, the arc-extinguishing chamber 2001 includes 14 or more arc-extinguishing grid plates. Compared with conventional technology, this utility model uses more arc-extinguishing grid plates. More arc-extinguishing grid plates can more fully divide the arc, reduce the arc sustaining voltage, accelerate arc cooling, and disrupt the electrical state; improve the ability to interrupt large currents and prevent arc reignition; in addition, more arc-extinguishing grid plates can complete arc division in a shorter space, thereby reducing the overall volume of the arc-extinguishing chamber and thus reducing the size of the circuit breaker. Of course, the arc-extinguishing chamber of this utility model is not limited to including more than 14 arc-extinguishing grid plates; arc-extinguishing chambers with fewer than 14 arc-extinguishing grid plates are also within the protection scope of this utility model.

[0037] According to another embodiment of the present invention, the circuit breaker further includes a housing for enclosing the circuit breaker and the arc extinguishing mechanism to achieve safety protection, insulation isolation, and structural support.

[0038] Although the present invention has been described through preferred embodiments, the present invention is not limited to the embodiments described herein, and includes various changes and variations without departing from the scope of the present invention.

[0039] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0041] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is 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 can mean that the first feature is 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.

[0042] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

Claims

1. An arc-extinguishing mechanism for a circuit breaker, characterized in that, include: The circuit breaker includes an arc-extinguishing chamber, a first arc-initiating plate, a second arc-initiating plate, and a first arc-blowing coil. The first end of the first arc-initiating plate is configured to connect to the stationary contact support of the circuit breaker, and the second end extends to one side of the arc-extinguishing chamber. The first end of the second arc-initiating plate is close to the moving contact area of ​​the circuit breaker, and the second end extends to the opposite side of the arc-extinguishing chamber. The first end of the first arc-blowing coil is connected to the stationary contact support, and the second end is configured to be electrically connected to the main circuit on the stationary contact side. The first arc-blowing coil is configured to drive the arc in the moving and stationary contact areas and their vicinity toward the arc-extinguishing chamber.

2. The arc-extinguishing mechanism according to claim 1, characterized in that, The first arc-blowing coil is disposed in the area of ​​the moving and stationary contacts.

3. The arc-extinguishing mechanism according to claim 2, characterized in that, The first arc-blowing coil includes a first oblique section, a first straight section and a second straight section that are parallel to each other, a bridging section, and a second oblique section. The first oblique section is connected between the stationary contact support and the first end of the first straight section. The first end of the second oblique section is configured to be electrically connected to the main circuit on the stationary contact side, and the second end is connected to the first end of the second straight section. The bridging section is connected between the second end of the first straight section and the second end of the second straight section.

4. The arc-extinguishing mechanism according to any one of claims 1-3, characterized in that, It also includes a second arc-blowing coil, which is configured to drive the arc between the first arc-initiating plate and the second arc-initiating plate toward the arc-extinguishing chamber.

5. The arc-extinguishing mechanism according to claim 4, characterized in that, The second arc-blowing coil is disposed on the outer side of the second arc-initiating plate opposite to the first arc-initiating plate. The first end of the second arc-blowing coil is connected to the first end of the second arc-initiating plate, and the second end is configured to be electrically connected to the main circuit on the moving contact side.

6. The arc-extinguishing mechanism according to claim 1, characterized in that, The first arc-starting plate has a curved portion that bends toward the second arc-starting plate.

7. The arc-extinguishing mechanism according to claim 6, characterized in that, The curved portion includes an arcuate portion extending from the stationary contact support portion and a straight portion extending from the end of the arcuate portion away from the second arc-starting plate.

8. The arc-extinguishing mechanism according to claim 6 or 7, characterized in that, A magnetizing sheet is provided on the side of the curved portion away from the second arc-guiding plate, and the shape of the magnetizing sheet matches the shape of the curved portion.

9. The arc-extinguishing mechanism according to claim 1, characterized in that, It also includes a gas-generating plate that covers the area of ​​the moving and stationary contacts and the area between the first arc-starting plate and the second arc-starting plate.

10. A circuit breaker device, characterized in that, Includes circuit breakers and arc-extinguishing mechanisms according to any one of claims 1-9.

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