CN220020982U

CN220020982U - Arc extinguishing device and circuit breaker

Info

Publication number: CN220020982U
Application number: CN202321400534.4U
Authority: CN
Inventors: 周荣伟; 韩畅; 王喜成
Original assignee: Delixi Electric Co Ltd
Current assignee: Delixi Electric Co Ltd
Priority date: 2023-06-02
Filing date: 2023-06-02
Publication date: 2023-11-14
Anticipated expiration: 2033-06-02

Abstract

The application relates to the technical field of electrical equipment, in particular to an arc extinguishing device, which comprises a first arc extinguishing chamber, a second arc extinguishing chamber, an arc cutting plate and an insulating piece, wherein the first arc extinguishing chamber is provided with a first air inlet facing a first direction; the second arc-extinguishing chamber is arranged in parallel with the first arc-extinguishing chamber, and is provided with a second air inlet facing the first direction; the arc cutting plate is arranged outside the first air inlet and the second air inlet so as to divide the electric arc into a first arc section and a second arc section along the length direction; the insulation piece is positioned between the first arc extinguishing chamber and the second arc extinguishing chamber and is partially arranged between the first air inlet and the second air inlet, and the projection of the insulation piece positioned on the first side of the arc cutting plate along the first direction is not overlapped with the first arc extinguishing chamber; the projection of the part of the insulating piece, which is positioned on the second side of the arc cutting plate, along the first direction is not overlapped with the second arc extinguishing chamber. The application can reduce the coverage and shielding of the insulating piece on the second air inlet, so that the second arc section can smoothly enter the second arc extinguishing chamber from the second air inlet.

Description

Arc extinguishing device and circuit breaker

Technical Field

The embodiment of the application relates to the technical field of electrical equipment, in particular to an arc extinguishing device and a circuit breaker.

Background

A circuit breaker refers to a mechanical switching device capable of closing, carrying and breaking a current under normal circuit conditions, and capable of carrying and breaking a current under abnormal circuit conditions for a prescribed time. The arc extinguishing device is an important component mechanism of the circuit breaker,

the arc extinguishing device mainly relies on dividing and elongating the arc to raise the voltage of the arc, thereby extinguishing the arc. The arc voltage is equal to the sum of the voltages of the arc segments between each adjacent arc chute, and is typically increased by increasing the number of arc chute pieces, increasing the number of times the arc is divided.

However, considering that the internal structure of the circuit breaker is complex, the size of the arc extinguishing chambers along the arrangement direction of the grid plates is difficult to increase, and related technologies propose an arc extinguishing device structure for connecting a plurality of arc extinguishing chambers in series.

However, when the arc extinguishing device with the structure is applied to a circuit breaker, an arc is often difficult to enter the arc extinguishing chamber and is extinguished in time, and particularly, the phenomenon that the arc burns out a structural member of the circuit breaker exists near an air inlet of the arc extinguishing chamber.

Disclosure of Invention

In view of the above problems, the embodiment of the utility model provides an arc extinguishing device and a circuit breaker, which solve the problem that an arc is difficult to enter an arc extinguishing chamber to extinguish in time, so that structural members of the circuit breaker are burnt.

According to an aspect of an embodiment of the present utility model, there is provided an arc extinguishing device including: the device comprises a first arc extinguishing chamber, a second arc extinguishing chamber, an arc cutting plate and an insulating piece, wherein the first arc extinguishing chamber is provided with a first air inlet facing a first direction; the second arc-extinguishing chamber is arranged in parallel with the first arc-extinguishing chamber, and is provided with a second air inlet facing the first direction; the arc cutting plate is arranged outside the first air inlet and the second air inlet so as to divide the electric arc into a first arc section and a second arc section along the length direction, the first arc section is positioned at the first side of the arc cutting plate, and the second arc section is positioned at the second side of the arc cutting plate; the insulation piece is positioned between the first arc-extinguishing chamber and the second arc-extinguishing chamber and at least partially arranged between the first air inlet and the second air inlet, and the projection of the part of the insulation piece positioned on the first side of the arc cutting plate along the first direction is not overlapped with the first arc-extinguishing chamber, so that the first arc section enters the first arc-extinguishing chamber from the first air inlet; the projection of the part of the insulating piece, which is positioned on the second side of the arc cutting plate, along the first direction is not overlapped with the second arc extinguishing chamber, so that the second arc section enters the second arc extinguishing chamber from the second air inlet.

Through above-mentioned scheme, first explosion chamber and second explosion chamber provide two arc extinguishing spaces. The first air inlet and the second air inlet face the first direction, the arc cutting plate is arranged outside the first air inlet and the second air inlet, and the arc is divided into a first arc section and a second arc section along the length direction by the arc cutting plate, so that the first arc section and the second arc section can enter different arc extinguishing chambers respectively. The insulating part is at least partially arranged between the first air inlet and the second air inlet so as to insulate and isolate the electric arc entering the first air inlet from the electric arc segment entering the second air inlet between the first air inlet and the second air inlet, and prevent electric connection between the two electric arc segments from occurring, and influence the effect of series connection and segmentation of the electric arc between the first arc extinguishing chamber and the second arc extinguishing chamber. The part that the insulating part is located the first side of cutting the arc board along the projection of first direction with first explosion chamber non-overlap, can reduce the insulating part to the cover of first air inlet and shelter from to reduce the resistance of first explosion chamber to electric arc, make first arc section can get into first explosion chamber from first air inlet more fast more smoothly. The part of the insulating part, which is positioned on the second side of the arc cutting plate, is not overlapped with the second arc extinguishing chamber along the projection of the first direction, and the covering and shielding of the insulating part to the second air inlet can be reduced, so that the resistance of the second arc extinguishing chamber to the electric arc is reduced, and the second arc section can enter the second arc extinguishing chamber from the second air inlet faster and more smoothly.

Thus, the above structure is advantageous in reducing the aggregation of the first arc segments near the first air inlet and the aggregation of the second arc segments near the second air inlet, so that the first arc segments are cut and elongated in the first arc extinguishing chamber and the second arc segments are cut and elongated in the second arc extinguishing chamber. When the first arc-extinguishing chamber is connected with the second arc-extinguishing chamber in series, the total length of the stretched electric arc is equal to the sum of the stretched length of the first arc section and the stretched length of the second arc section, so that the aim of rapidly extinguishing the electric arc is fulfilled, and the problem that the electric arc is difficult to extinguish in time and the structural part of the circuit breaker is burnt is avoided.

In some embodiments, a portion of the insulating member on the first side of the arc cutting plate is provided with a first arc guiding surface on a side close to the first arc extinguishing chamber; a second arc guide surface is arranged on one side, close to the second arc extinguishing chamber, of the part, located on the second side, of the arc cutting plate, of the insulating piece; the first guide cambered surface and the second guide cambered surface are fillets or chamfers.

Through above-mentioned scheme, the first arc-guiding surface and the second arc-guiding surface of fillet or chamfer structure can make the insulating part smooth transition in edges and corners department, reduce the resistance of electric arc in entering first explosion chamber or second explosion chamber in-process, are favorable to leading first arc section to get into first explosion chamber fast to and guide second arc section to get into the second explosion chamber fast, thereby quench the electric arc fast.

In some embodiments, a projection of a portion of the insulator on the first side of the arc plate along the first direction at least partially overlaps the second arc chute; a projection of a portion of the insulating member on the second side of the arc cutting plate along the first direction at least partially overlaps the first arc extinguishing chamber.

Through above-mentioned scheme, the part that the insulating part is located the first side of arc cutting board can at least partly shelter from the second explosion chamber, reduces and prevents even that first electric arc section from getting into the second explosion chamber to reduce the probability that first electric arc section and second electric arc section are connected in first explosion chamber. Likewise, the portion of the insulating member on the second side of the arc cutting plate can at least partially shield the first arc extinguishing chamber, reducing or even preventing the second arc segment from entering the first arc extinguishing chamber, thereby reducing the probability of connecting the first arc segment and the second arc segment in the second arc extinguishing chamber. Therefore, the scheme ensures that the first arc section only enters the first arc-extinguishing chamber as much as possible, the second arc section only enters the second arc-extinguishing chamber as much as possible, and the first arc section and the second arc section are connected through the electric connection of the first arc-extinguishing chamber and the second arc-extinguishing chamber, so that the electric arc can be jointly divided and elongated by the first arc-extinguishing chamber and the second arc-extinguishing chamber to the greatest extent, and the extinction of the electric arc is quickened.

According to a second aspect of the present application, there is provided an arc extinguishing device of another structure, the arc extinguishing device comprising: the device comprises a first arc extinguishing chamber, a second arc extinguishing chamber, a first magnetism increasing piece, a second magnetism increasing piece, an arc cutting plate and an insulating piece. The first arc extinguishing chamber is provided with a first air inlet facing a first direction; the second arc-extinguishing chamber is arranged in parallel with the first arc-extinguishing chamber, and is provided with a second air inlet facing the first direction; the first magnetism increasing piece is arranged on one side of the first air inlet far away from the second air inlet; the second magnetism increasing piece is arranged on one side of the second air inlet far away from the first air inlet; the arc cutting plate is arranged outside the first air inlet and the second air inlet so as to divide the electric arc into a first arc section and a second arc section along the length direction, the first arc section is positioned at the first side of the arc cutting plate, and the second arc section is positioned at the second side of the arc cutting plate; the insulation piece is positioned between the first arc extinguishing chamber and the second arc extinguishing chamber and at least partially arranged between the first air inlet and the second air inlet, and the width of the overlapping part of the insulation piece positioned on the first side of the arc cutting plate along the first direction and the first arc extinguishing chamber is smaller than the width of the projection of the first magnetism increasing piece along the first direction, so that the first arc section enters the first arc extinguishing chamber from the first air inlet; the width of the overlapping part of the projection of the part of the insulating piece, which is positioned on the second side of the arc cutting plate, along the first direction and the second arc extinguishing chamber is smaller than the width of the projection of the second magnetism increasing piece along the first direction, so that the second arc section enters the second arc extinguishing chamber from the second air inlet.

Through the scheme, the magnetic field near the first air inlet and the second air inlet can be enhanced by the first magnetism increasing piece and the second magnetism increasing piece, so that when an electric arc is generated near the first air inlet and the second air inlet, the electric arc can be subjected to larger magnetic driving force under the action of the superimposed magnetic field of the first magnetism increasing piece and the second magnetism increasing piece, and the electric arc can enter from the first air inlet and the second air inlet more easily. Under the condition that the first magnetism increasing piece and the second magnetism increasing piece are arranged, even if the projection of the part of the insulating piece, which is positioned on the first side of the arc cutting plate, along the first direction inevitably overlaps with the first arc extinguishing chamber, the magnetic driving force can overcome the obstruction of the insulating piece to the electric arc in a certain range, so that the electric arc smoothly enters the first arc extinguishing chamber. The width of the overlapped part is smaller than the projection width of the first magnetism increasing piece along the first direction, so that the shielding area of the overlapped part to the air inlet of the first arc extinguishing chamber is reduced, the resistance of the insulating piece to the electric arc is reduced, and the electric arc can smoothly enter the first arc extinguishing chamber under the action of the enhanced magnetic driving force. The width of the overlapping part of the projection of the part of the insulating piece, which is positioned on the second side of the arc cutting plate, along the first direction and the second arc extinguishing chamber is smaller than the width of the projection of the second magnetism increasing piece along the first direction, and the same effect is achieved. Therefore, the above scheme is beneficial to reducing the aggregation of the first arc section near the first air inlet and the aggregation of the second arc section near the second air inlet, so that the electric arc can smoothly enter the first air inlet and the second air inlet and be extinguished in time.

In some embodiments, along the parallel direction of the first arc-extinguishing chamber and the second arc-extinguishing chamber, the projection of the first magnetism-increasing member is not overlapped with the projection of the arc-extinguishing gate sheet of the first arc-extinguishing chamber and the projection of the arc-extinguishing gate sheet of the second arc-extinguishing chamber, and the projection of the second magnetism-increasing member is not overlapped with the projection of the arc-extinguishing gate sheet of the first arc-extinguishing chamber and the projection of the arc-extinguishing gate sheet of the second arc-extinguishing chamber.

Through the scheme, the parallel direction of the first arc extinguishing chamber and the second arc extinguishing chamber, namely the direction of the first magnetism increasing piece and the second magnetism increasing piece. In this direction, the projection of the first magnetism increasing member is not overlapped with the projections of the arc extinguishing gate sheet of the first arc extinguishing chamber and the arc extinguishing gate sheet of the second arc extinguishing chamber, the projection of the second magnetism increasing member is not overlapped with the projections of the arc extinguishing gate sheet of the first arc extinguishing chamber and the arc extinguishing gate sheet of the second arc extinguishing chamber, and the projection is equivalent to that the arc extinguishing gate sheet of the first arc extinguishing chamber and the arc extinguishing gate sheet of the second arc extinguishing chamber are not positioned in the opposite areas of the first magnetism increasing member and the second magnetism increasing member. Therefore, when the electric arc is divided and enters the area where the first magnetism increasing piece and the second magnetism increasing piece are opposite, the electric arc is stretched firstly after being subjected to magnetic driving force, the electric arc can possibly enter the arc extinguishing chamber until the electric arc moves out of the area where the first magnetism increasing piece and the second magnetism increasing piece are opposite, and in the area, the arc extinguishing grid does not obstruct the electric arc, so that the resistance of the electric arc in the stretched process is reduced, the stretched length of the electric arc is longer, the voltage is higher, and the electric arc is easy to extinguish.

In some embodiments, the first magnetism increasing member includes a plurality of first magnetism increasing plates, each first magnetism increasing plate is connected with the arc extinguishing gate sheet of the first arc extinguishing chamber one to one, and a gap is formed between adjacent first magnetism increasing plates; the second magnetism increasing piece comprises a plurality of second magnetism increasing plates, each second magnetism increasing plate is connected with the arc extinguishing grid plates of the second arc extinguishing chamber one to one, and gaps are reserved between the adjacent second magnetism increasing plates.

Through the scheme, after the first arc section enters the first arc extinguishing chamber, a magnetic field is generated around an arc under the action of the arc extinguishing grid plates and the first magnetic increasing plates; after the second arc segment enters the second arc extinguishing chamber, a magnetic field is generated around the arc under the action of the arc extinguishing grid plates and the second magnetic increasing plates. The magnetic fields generated by the first arc section and the second arc section are overlapped around the first arc section and the second arc section, so that the electric arc in the opposite areas of the first magnetism increasing piece and the second magnetism increasing piece is more easily driven to the first arc extinguishing chamber and the second arc extinguishing chamber.

In some embodiments, the first magnetic enhancement plate is integrally disposed with the arc chute sheet of the first arc chute; the second magnetism increasing plate that is connected sets up with the arc extinguishing bars piece of second explosion chamber an organic whole.

Through above-mentioned scheme, arc extinguishing device's structure is simpler to be convenient for processing manufacturing.

In some embodiments, the first magnetism increasing member includes a first magnetism conducting plate, the first magnetism conducting plate is disposed along an arrangement direction of the plurality of arc extinguishing gate sheets of the first arc extinguishing chamber, and the first magnetism conducting plate is disposed in an insulating manner with the plurality of arc extinguishing gate sheets of the first arc extinguishing chamber; the second magnetism increasing piece comprises a second magnetism conducting plate, the second magnetism conducting plate is arranged along the arrangement direction of a plurality of arc extinguishing grid plates of the second arc extinguishing chamber, and the second magnetism conducting plate and the arc extinguishing grid plates of the second arc extinguishing chamber are arranged in an insulating mode.

Through the scheme, the electric arc can generate a magnetic field between the first magnetic conduction plate and the second magnetic conduction plate, so that the magnetic field intensity in the opposite area of the first magnetic conduction plate and the second magnetic conduction plate is increased, and the electric arc in the area is easier to drive to the first arc extinguishing chamber and the second arc extinguishing chamber. The insulating arrangement between the first magnetic conduction plate and the plurality of arc extinguishing bars of the first arc extinguishing chamber can prevent the plurality of arc extinguishing bars of the first arc extinguishing chamber from being electrically connected through the first magnetic conduction plate, so that after the first arc section enters the first arc extinguishing chamber, short circuit is caused to a loop where an arc is located, and the voltage rise of the first arc section is influenced. Similarly, the insulation arrangement between the second magnetic conduction plate and the plurality of arc extinguishing bars of the second arc extinguishing chamber has similar effects.

According to a third aspect of the present application, there is provided a circuit breaker comprising: the contact assembly and the arc chute assembly of any of the embodiments of any of the arc chute subject matter described above; the contact assembly is arranged outside the first air inlet and/or the second air inlet.

In the process of opening and closing, the generated electric arc can be divided into a first electric arc section and a second electric arc section by the arc cutting plate, the first electric arc section rapidly enters into the first arc extinguishing chamber, the second electric arc section rapidly enters into the second arc extinguishing chamber, when the first arc extinguishing chamber and the second arc extinguishing chamber are connected in series, the total length of the stretched electric arc is equal to the sum of the stretched length of the first electric arc section and the stretched length of the second electric arc section, so that the aim of rapidly increasing the electric arc voltage to extinguish the electric arc is fulfilled, and the electric arc is prevented from being difficult to extinguish in time to burn structural members of the circuit breaker.

According to the arc extinguishing device provided by the embodiment of the application, the insulating piece is arranged, at least part of the insulating piece is arranged between the first air inlet and the second air inlet, and the projection of the part of the insulating piece, which is positioned on the first side of the arc cutting plate, along the first direction is not overlapped with the first arc extinguishing chamber; the projection of the part of the insulating part, which is positioned on the second side of the arc cutting plate, along the first direction is not overlapped with the second arc extinguishing chamber, so that the shielding of the part of the insulating part, which is positioned on the first side of the arc cutting plate, to the first air inlet is reduced, the aggregation of the first arc segments near the first air inlet is reduced, and the shielding of the part of the insulating part, which is positioned on the second side of the arc cutting plate, to the second air inlet is reduced, and the aggregation of the second arc segments near the second air inlet is reduced. The first arc section is cut and elongated in the first arc-extinguishing chamber, the second arc section is cut and elongated in the second arc-extinguishing chamber, and when the first arc-extinguishing chamber is connected with the second arc-extinguishing chamber in series, the total length of the stretched electric arc is equal to the sum of the stretched length of the first arc section and the stretched length of the second arc section, so that the aim of rapidly extinguishing the electric arc is fulfilled, and the electric arc is prevented from being difficult to extinguish in time and burning the structural component of the circuit breaker.

The foregoing description is only an overview of the technical solutions of the embodiments of the present application, and may be implemented according to the content of the specification, so that the technical means of the embodiments of the present application can be more clearly understood, and the following specific embodiments of the present application are given for clarity and understanding.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is an axial side view of an arc extinguishing device according to an embodiment of the present application.

Fig. 2 is a front view of an arc extinguishing device according to an embodiment of the present application.

FIG. 3 is a cross-sectional view taken along the A-A plane in FIG. 2.

Fig. 4 is a cross-sectional view of the B-B plane of fig. 2.

Fig. 5 is a waveform diagram of a short-circuit breaking capability test of a circuit breaker before and after improvement of an arc extinguishing device.

Fig. 6 is a schematic structural diagram of a first magnetism enhancing member and a second magnetism enhancing member in an embodiment of the present application.

Fig. 7 is a schematic structural diagram of another first magnetism enhancing member and a second magnetism enhancing member according to an embodiment of the present application.

Fig. 8 is a schematic structural diagram of another arc extinguishing device according to an embodiment of the present application.

Fig. 9 is a schematic diagram of a partial structure of a circuit breaker according to the present application.

Reference numerals illustrate: 10. arc extinguishing device; 110. a first arc extinguishing chamber; 111. a first air inlet; 120. a second arc extinguishing chamber; 121. a second air inlet; 130. an insulating member; 131. a first arc-guiding surface; 132. a second arc-guiding surface; 140. arc cutting plates; 150. a first magnetism increasing member; 151. a first magnetism increasing plate; 152. a first magnetic conductive plate; 160. a second magnetism increasing member; 161. a second magnetism increasing plate; 162. a second magnetic conductive plate; 170. a first arc striking member; 180. a second arc striking member; 190. bridging arc striking pieces; 191. a first bridge arm; 192. a second bridge arm; 20. a contact assembly; 210. a stationary contact; 220. a moving contact; x, first direction.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the applications herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

The terms "comprising" and "having" and any variations thereof in the description and claims of the application and in the description of the drawings are intended to cover and not exclude other matters. The word "a" or "an" does not exclude the presence of a plurality.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of the phrase "an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The directional terms appearing in the following description are directions shown in the drawings, and do not limit the specific structures of the arc extinguishing device and the circuit breaker of the present application. For example, in the description of the present application, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Further, expressions of directions of indication for explaining the operations and configurations of the respective members of the arc extinguishing device and the circuit breaker of the present embodiment, such as the X direction, the Y direction, and the Z direction, are not absolute but relative, and although these indications are appropriate when the respective members of the arc extinguishing device and the circuit breaker are in the positions shown in the drawings, when these positions are changed, these directions should be interpreted differently to correspond to the changes.

Furthermore, the terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not for describing a particular sequential order, and may be used to improve one or more of these features either explicitly or implicitly.

In the description of the present application, unless otherwise indicated, the meaning of "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two).

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, e.g., as a "connected" or "coupled" of a mechanical structure may refer to a physical connection, e.g., as a fixed connection, e.g., via a fastener, such as a screw, bolt, or other fastener; the physical connection may also be a detachable connection, such as a snap-fit or snap-fit connection; the physical connection may also be an integral connection, such as a welded, glued or integrally formed connection. "connected" or "connected" of circuit structures may refer to physical connection, electrical connection or signal connection, for example, direct connection, i.e. physical connection, or indirect connection through at least one element in the middle, so long as circuit communication is achieved, or internal communication between two elements; signal connection may refer to signal connection through a medium such as radio waves, in addition to signal connection through a circuit. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

In general, the extinguishing method of an arc includes increasing loop resistance, dividing a long arc into a plurality of short arcs, increasing arc length, bringing the arc into close contact with an arc-resistant insulating material, extinguishing the arc by an arc extinguishing gate, and the like.

The arc extinction by the arc extinction grid plates means that an arc is led into an arc extinction chamber, the arc is divided into a series of short arcs by a plurality of arc extinction grid plates in the arc extinction chamber, according to the near-cathode effect, the voltage of 15-25V appears at the cathode of each short arc, and if the sum exceeds the voltage between contacts, the current is reduced, and the arc is extinguished.

It can be seen that to improve the efficiency and reliability of arc extinction of the arc chute, it is first necessary to reliably introduce the arc into the arc chute. To achieve reliable introduction of the arc into the arc chute, this can be achieved by increasing the driving force for the arc or by reducing the resistance to the arc as it enters the arc chute.

In the arc extinguishing device in the related art, though the structure form that a plurality of arc extinguishing chambers are connected in series can lead the total length of the stretched arc to be equal to the sum of the stretched lengths of a plurality of arc sections in different arc extinguishing chambers, thereby improving the arc voltage and achieving the purpose of quick arc extinguishing. However, the arc extinguishing device cannot reliably introduce the arc into the arc extinguishing chamber, so that the arc is accumulated near the air inlet of the arc extinguishing chamber, and structural members of the circuit breaker are burned.

The application provides an arc extinguishing device and a circuit breaker, and the arc extinguishing device and the circuit breaker provided by the application are briefly introduced by combining drawings. Referring to fig. 1, 2, 3 and 4, fig. 1 is an axial side view of an arc extinguishing device according to an embodiment of the present application, fig. 2 is a front view of an arc extinguishing device according to an embodiment of the present application, fig. 3 is a cross-sectional view of A-A in fig. 2, and fig. 4 is a cross-sectional view of B-B in fig. 2.

Before describing the arc extinguishing device of the present application, it should be emphasized that the "series connection" between the arc extinguishing chambers related in the foregoing and the following description of the present application means that one arc extinguishing gate of one arc extinguishing chamber is electrically connected with one arc extinguishing gate of the other arc extinguishing chamber, and when an arc enters into both arc extinguishing chambers, the arc extinguishing gate of the different arc extinguishing chambers is in a series connection relationship through the arc and the above electrical connection structure.

As shown in fig. 1 and 2, the arc extinguishing device 10 includes a first arc extinguishing chamber 110, a second arc extinguishing chamber 120, an arc cutting plate 140, and an insulator 130, the first arc extinguishing chamber 110 having a first air inlet 111 facing a first direction X; the second arc extinguishing chamber 120 is arranged in parallel with the first arc extinguishing chamber 110, the second arc extinguishing chamber 120 having a second air inlet 121 facing the first direction X; the arc cutting plate 140 is disposed outside the first air inlet 111 and the second air inlet 121 to divide the arc into a first arc segment and a second arc segment along the length direction, wherein the first arc segment is located on a first side of the arc cutting plate 140 (above the arc cutting plate 140 in fig. 1), and the second arc segment is located on a second side of the arc cutting plate 140 (below the arc cutting plate 140 in fig. 1).

As shown in fig. 3 and 4, the insulating member 130 is located between the first arc extinguishing chamber 110 and the second arc extinguishing chamber 120 and at least partially located between the first air inlet 111 and the second air inlet 121, and a projection of a portion of the insulating member 130 located on the first side of the arc cutting plate 140 along the first direction X is not overlapped with the first arc extinguishing chamber 110, so that the first arc segment enters the first arc extinguishing chamber 110 from the first air inlet 111; the portion of the insulating member 130 located at the second side of the arc cutting plate 140 is projected in the first direction X not to overlap the second arc chute 120 so that the second arc segment enters the second arc chute 120 from the second air inlet 121.

The first arc-extinguishing chamber 110 includes a plurality of arc-extinguishing bars, the plurality of arc-extinguishing bars are arranged along a direction, gaps are provided between the plurality of arc-extinguishing bars, and arc segments segmented by the arc-extinguishing bars can be transferred in the gaps.

The structure of the second arc extinguishing chamber 120 is similar to that of the first arc extinguishing chamber 110, and the structure of the second arc extinguishing chamber 120 is not repeated in the embodiment of the present application.

When the electric arc is generated in the area where the first air inlet 111 and/or the second air inlet 121 face, the electric arc is subjected to the magnetic driving force in the opposite direction of the first direction X, and then the electric arc can enter not only the first arc extinguishing chamber 110 but also the second arc extinguishing chamber 120 from the first air inlet 111, i.e., the first air inlet 111 and the second air inlet 121 face the same direction X.

The first arc chute 110 and the second arc chute 120 provide two arc extinguishing spaces for the arc. After the first arc-extinguishing chamber 110 and the second arc-extinguishing chamber 120 are arranged in parallel, the arrangement direction of the plurality of arc-extinguishing gate sheets in the first arc-extinguishing chamber 110 can be parallel to the arrangement direction of the plurality of arc-extinguishing gate sheets in the second arc-extinguishing chamber 120, so that the same beam of electric arc can be split by the arc-extinguishing gate sheets in different arc-extinguishing chambers after entering the first arc-extinguishing chamber 110 or the second arc-extinguishing chamber 120 along the opposite direction of the first direction X.

The arc cutting plate 140 is a member for dividing an arc, which may be a thin plate-like structure, as shown in fig. 1, one edge of the arc cutting plate 140 faces a first direction X so as to divide the arc when the arc enters the arc extinguishing chamber. After the arc is divided into the first arc segment and the second arc segment along the length direction by the arc cutting plate 140, the first arc segment and the second arc segment can enter different arc extinguishing chambers respectively.

Taking the direction illustrated in fig. 1 as an example, in the drawing, X represents a first direction, Y represents a direction in which the first arc extinguishing chamber 110 and the second arc extinguishing chamber 120 are arranged, and Z represents a direction in which the arc extinguishing gate sheets of the first arc extinguishing chamber 110 and the arc extinguishing gate sheets of the second arc extinguishing chamber 120 are arranged, a side above the arc cutting plate 140 is a first side of the arc cutting plate 140, and a side below the arc cutting plate 140 is a second side of the arc cutting plate 140.

The insulating member 130 is a member made of an insulating material, and is located between the first arc extinguishing chamber 110 and the second arc extinguishing chamber 120 so as to insulate the first arc extinguishing chamber 110 from the second arc extinguishing chamber 120.

The insulating member 130 is at least partially disposed between the first air inlet 111 and the second air inlet 121, so as to insulate the arc entering the first air inlet 111 from the arc segment entering the second air inlet 121 between the first air inlet 111 and the second air inlet 121, and prevent the electrical connection between the two arc segments from affecting the effect of splitting the arc by connecting the first arc extinguishing chamber 110 and the second arc extinguishing chamber 120 in series.

Generally, when the size of the gas inlet of the arc chute is reduced, it is advantageous to increase the pressure at the gas inlet, facilitating the entry of the arc into the arc chute. However, in the test, it was found that when the projection of the insulating member 130 in the first direction X is partially overlapped with the first arc-extinguishing chamber 110 to reduce the width dimension of the first air inlet 111 (i.e., the dimension of the first air inlet 111 in the Y direction), it is difficult for the arc to enter the first arc-extinguishing chamber 110 instead, and when the projection of the insulating member 130 in the first direction X is not overlapped with the first arc-extinguishing chamber 110, the arc more easily enters the first arc-extinguishing chamber 110.

Therefore, as shown in fig. 3, a projection of a portion of the insulating member 130 located at the first side of the arc cutting plate 140 in the first direction X does not overlap with the first arc extinguishing chamber 110, thereby making it easier for the arc to enter the first arc extinguishing chamber 110.

As shown in fig. 4, a portion of the insulating member 130 located at the second side of the arc cutting plate 140 is projected in the first direction X not to overlap the second arc chute 120, thereby making it easier for the arc to enter the second arc chute 120.

According to the standard of GB 14048.2, a rated operation short-circuit breaking capability test of 750V 12kA is carried out on a circuit breaker comprising an arc extinguishing device before and after improvement, wherein the circuit breaker before improvement is different from the circuit breaker after improvement only in that in the arc extinguishing device in the circuit breaker before improvement, the part of an insulating part positioned on the first side of a cutting arc plate 140 is partially overlapped with a first arc extinguishing chamber 110 along a first direction X, the overlapped width (namely Y-direction dimension) is 1/3 of the width (namely Y-direction dimension) of a fixed contact, and the part of an insulating part 130 positioned on the second side of the cutting arc plate 140 is partially overlapped with a second arc extinguishing chamber 120 along the first direction X, and the overlapped width (namely Y-direction dimension) is 1/3 of the width (namely Y-direction dimension) of the fixed contact. In the arc extinguishing device in the improved circuit breaker, the projection of the part of the insulating member positioned on the first side of the arc cutting plate 140 along the first direction X is not overlapped with the first arc extinguishing chamber 110, and the projection of the part of the insulating member 130 positioned on the second side of the arc cutting plate 140 along the first direction X is not overlapped with the second arc extinguishing chamber 120.

The waveform of the main loop current over time obtained by the test is shown in fig. 5. As can be seen from the waveform changes before and after the improvement in fig. 5, the duration of the short-circuit current in the breaking process of the circuit breaker before the improvement is far longer than that of the circuit breaker after the improvement, that is, the arcing time of the arc in the breaking process of the circuit breaker before the improvement is longer, and the arcing time of the arc in the breaking process of the circuit breaker after the improvement is shorter, that is, the arc is more easy to extinguish.

In summary, the above-described structure is advantageous in reducing the aggregation of the first arc segments near the first air inlet 111 and the aggregation of the second arc segments near the second air inlet 121, so that the first arc segments are cut and elongated in the first arc extinguishing chamber 110 and the second arc segments are cut and elongated in the second arc extinguishing chamber 120. When the first arc-extinguishing chamber 110 is connected in series with the second arc-extinguishing chamber 120, the total length of the stretched arc is equal to the sum of the stretched length of the first arc section and the stretched length of the second arc section, so as to achieve the purpose of rapidly extinguishing the arc and prevent the arc from being difficult to extinguish in time and burning the structural components of the circuit breaker.

With continued reference to fig. 3 and fig. 4, in some embodiments, a portion of the insulating member 130 located on the first side of the arc cutting plate 140, which is close to the first arc extinguishing chamber 110, is provided with a first arc guiding surface 131; a second arc guiding surface 132 is arranged on one side of the insulating part 130, which is positioned on the second side of the arc cutting plate 140 and is close to the second arc extinguishing chamber 120; the first guiding cambered surface 131 and the second guiding cambered surface 132 are rounded or chamfered.

The first arc guiding surface 131 guides the first arc segment to the surface of the first arc chute 110. In order to further perform the arc guiding function, a sharp corner, such as an acute angle, should be avoided as much as possible between the side of the first arc guiding surface 131 near the arc generation side and the side near the first air inlet 111, so as to reduce the blocking effect on the arc.

The second arc guiding surface 132 is a surface that guides the second arc segment to the second arc chute 120. Also, for the purpose of guiding the arc, a sharp corner, such as an acute angle, should be avoided as much as possible between the side of the second arc guiding surface 132 adjacent to the arc generation and the side adjacent to the second air inlet 121, thereby reducing the impeding effect on the arc.

The above embodiment provides the first guide arc surface 131 and the second guide arc surface 132 as rounded corners or chamfers. Wherein, the fillet refers to the transition angle of cambered surface shape. Chamfer refers to the transition angle of the planar shape.

Through the above scheme, if sharp edges and corners exist between the two side surfaces of the insulating member 130, the first arc guiding surface 131 and the second arc guiding surface 132 of the rounded or chamfered structure can cut the edges and corners, so that the two side surfaces of the insulating member 130 are smoothly transited, the resistance of the electric arc in the process of entering the first arc extinguishing chamber 110 or the second arc extinguishing chamber 120 is reduced, the first arc segment is guided to quickly enter the first arc extinguishing chamber 110, and the second arc segment is guided to quickly enter the second arc extinguishing chamber 120, so that the electric arc is extinguished quickly.

With continued reference to fig. 3 and 4, in some embodiments, a portion of the insulating member 130 located on the first side of the arc cutting plate 140 at least partially overlaps the second arc extinguishing chamber 120 along the first direction X; the portion of the insulating member 130 located at the second side of the arc cutting plate 140 is projected in the first direction X to at least partially overlap the first arc chute 110.

The projection of the portion of the insulating member 130 located on the first side of the arc cutting plate 140 along the first direction X at least partially overlaps the second arc extinguishing chamber 120, so that the portion of the insulating member 130 located on the first side of the arc cutting plate 140 can at least partially shield the second arc extinguishing chamber 120, thereby reducing or even preventing the first arc segment from entering the second arc extinguishing chamber 120, and reducing the probability of connecting the first arc segment and the second arc segment in the first arc extinguishing chamber 110.

Likewise, the projection of the portion of the insulating member 130 located on the second side of the arc cutting plate 140 along the first direction X at least partially overlaps the first arc extinguishing chamber 110, so that the portion of the insulating member 130 located on the second side of the arc cutting plate 140 can at least partially shield the first arc extinguishing chamber 110, reducing or even preventing the second arc segment from entering the first arc extinguishing chamber 110, thereby reducing the probability of connecting the first arc segment and the second arc segment in the second arc extinguishing chamber 120.

Therefore, the above scheme makes the first arc segment enter only the first arc-extinguishing chamber 110 as much as possible, and the second arc segment enter only the second arc-extinguishing chamber 120 as much as possible, and the first arc segment and the second arc segment are connected through the electrical connection between the first arc-extinguishing chamber 110 and the second arc-extinguishing chamber 120, so that the arc can be divided and elongated together by the first arc-extinguishing chamber 110 and the second arc-extinguishing chamber 120 to the greatest extent, thereby accelerating the extinction of the arc.

Optionally, a portion of the insulating member 130 located on the first side of the arc cutting plate 140, projected in the first direction X, completely covers the second arc chute 120; the part of the insulating member 130 located at the second side of the arc cutting plate 140 is projected in the first direction X to entirely cover the first arc chute 110.

As such, the first arc segment cannot enter the second arc chute 120, but can only enter the first arc chute 110 entirely, and be divided and stretched therein. The second arc segment cannot enter the first arc chute 110, but can only enter the second arc chute 120 entirely, and is divided and stretched therein.

In some embodiments, the portion of the insulator 130 between the first arc chute 110 and the second arc chute 120 is made of a thermosetting material.

The material of the portion of the insulating member 130 between the first air inlet 111 and the second air inlet 121 is not particularly limited, and may be a thermosetting material or a thermoplastic material.

For example, the thermoset material may be one or more of a phenolic resin, a urea-formaldehyde resin, a melamine resin, an unsaturated polyester resin, an epoxy resin, a silicone resin, or polyurethane, among others.

The thermoplastic material may be one or more of polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyoxymethylene, polyamide, or acrylic, etc.

Through the above scheme, the part of the insulating member 130 between the first arc-extinguishing chamber 110 and the second arc-extinguishing chamber 120 is not easy to soften, deform or even melt under the high temperature action of the arc, and can play a role in insulating and isolating between the first arc-extinguishing chamber 110 and the second arc-extinguishing chamber 120 more stably.

In order to solve the problem that the arc is difficult to enter the arc extinguishing chamber, the present application also provides an arc extinguishing device having a structure substantially the same as that of the arc extinguishing device described above, except that the arc extinguishing device further includes a first magnetism enhancing member 150 and a second magnetism enhancing member 160, and a projection of a portion of the insulating member 130 of the arc extinguishing device located at a first side of the arc cutting plate 140 along the first direction X may partially overlap with the first arc extinguishing chamber 110, and a projection of a portion of the insulating member 130 located at a second side of the arc cutting plate 140 along the first direction X may partially overlap with the second arc extinguishing chamber 120.

The structure of the other arc extinguishing device will be described in detail below. Referring to fig. 6 and 7, fig. 6 is a schematic structural diagram of a first magnetism enhancing member and a second magnetism enhancing member according to an embodiment of the present application, and fig. 7 is a schematic structural diagram of another first magnetism enhancing member and a second magnetism enhancing member according to an embodiment of the present application. In fig. 6 and 7, the structures of the first magnetism increasing member and the second magnetism increasing member are shown for convenience, and only portions of the arc extinguishing gate sheets of the first arc extinguishing chamber and the second arc extinguishing chamber remain.

As shown in fig. 1 and 2, an arc extinguishing device includes: the arc extinguishing device comprises a first arc extinguishing chamber 110, a second arc extinguishing chamber 120, a first magnetism increasing member 150, a second magnetism increasing member 160, an arc cutting plate 140 and an insulating member 130.

The first arc extinguishing chamber 110 has a first air inlet 111 facing the first direction X; the second arc extinguishing chamber 120 is arranged in parallel with the first arc extinguishing chamber 110, and the second arc extinguishing chamber 120 has a second air inlet 121 facing the first direction X.

As shown in fig. 6 and 7, the first magnetism increasing member 150 is disposed at a side of the first air inlet 111 away from the second air inlet 121; the second magnetism increasing member 160 is disposed on a side of the second air inlet 121 away from the first air inlet 111.

The arc cutting plate 140 is disposed outside the first air inlet 111 and the second air inlet 121 to divide the arc into a first arc segment and a second arc segment along the length direction, wherein the first arc segment is located on a first side of the arc cutting plate 140, and the second arc segment is located on a second side of the arc cutting plate 140.

The insulating member 130 is located between the first arc extinguishing chamber 110 and the second arc extinguishing chamber 120 and is at least partially located between the first air inlet 111 and the second air inlet 121, and a width of a portion of the insulating member 130 located on the first side of the arc cutting plate 140, which is projected along the first direction X, overlaps the first arc extinguishing chamber 110 is smaller than a width of the first magnetism increasing member 150 projected along the first direction X, so that the first arc segment enters the first arc extinguishing chamber 110 from the first air inlet 111; the width of the overlapping portion of the second arc extinguishing chamber 120 and the projection of the portion of the insulating member 130 located at the second side of the arc cutting plate 140 along the first direction X is smaller than the width of the projection of the second magnetism increasing member 160 along the first direction X, so that the second arc segment enters the second arc extinguishing chamber 120 from the second air inlet 121.

The first magnetism increasing member 150 and the second magnetism increasing member 160 are configured to generate a magnetic field near the first air inlet 111 and the second air inlet 121, where the magnetic field may be overlapped with an original magnetic field near the first air inlet 111 and the second air inlet 121, so that the magnetic field strength at the position is increased, and an arc can quickly move towards the first air inlet 111 or the second air inlet 121 under the action of magnetic force and enter the first arc extinguishing chamber 110 or the second arc extinguishing chamber 120, thereby realizing arc extinguishing.

In the case where the first magnetism increasing member 150 and the second magnetism increasing member 160 are provided, even if the projection of the portion of the insulating member 130 located on the first side of the arc cutting plate 140 along the first direction X inevitably overlaps the first arc extinguishing chamber 110, the magnetic driving force can overcome the obstruction of the insulating member 130 to the arc within a certain range, so that the arc smoothly enters the first arc extinguishing chamber 110. By making the width of the above-mentioned overlapping portion smaller than the width of the projection of the first magnetism increasing member 150 along the first direction X, the shielding area of the above-mentioned overlapping portion to the air inlet of the first arc extinguishing chamber 110 is reduced, so that the resistance of the insulating member 130 to the arc is reduced, and the arc is facilitated to smoothly enter the first arc extinguishing chamber 110 under the action of the enhanced magnetic driving force.

The width of the overlapping portion of the projection of the insulating member 130 on the second side of the arc cutting plate 140 along the first direction X and the second arc extinguishing chamber 120 is smaller than the width of the projection of the second magnetism increasing member 160 along the first direction X, which has similar effects to those of the above technical solutions and will not be repeated herein.

If the width of the portion of the insulating member 130 located at the first side of the arc cutting plate 140, where the portion overlaps the first arc extinguishing chamber 110, is denoted as D11, and the width of the first magnetism increasing member 150, where the portion is projected in the first direction X, is denoted as D21, the ratio of D11 to D21 is 0 to 0.8 in some embodiments, so that the first arc segment relatively smoothly enters the first arc extinguishing chamber 110 from the first air inlet 111.

In other embodiments, the ratio of D11 to D21 is 0 to 0.5 to make the first arc segment more smoothly enter the first arc extinguishing chamber 110 from the first air inlet 111.

In still other embodiments, the ratio of D11 to D21 is between 0 and 0.25 to further facilitate the passage of the first arc segment from the first inlet port 111 into the first arc chute 110.

If the width of the portion of the insulating member 130 located at the second side of the arc cutting plate 140, where the portion overlaps the second arc extinguishing chamber 120, is denoted as D12, and the width of the second magnetism increasing member 160, where the portion is projected in the first direction X, is denoted as D22, the ratio of D12 to D22 is 0 to 0.8 in some embodiments, so that the second arc segment relatively smoothly enters the second arc extinguishing chamber 120 from the second air inlet 121.

In other embodiments, the ratio of D12 to D22 is 0 to 0.5 to allow the second arc segment to more smoothly enter the second arc chute 120 from the second air inlet 121.

In still other embodiments, the ratio of D12 to D22 is between 0 and 0.25 to further facilitate the passage of the second arc segment from the second inlet 121 into the second arc chute 120.

It can be seen that the arc extinguishing device 10 with the above structure is beneficial to reducing the aggregation of the first arc segments near the first air inlet 111 and the aggregation of the second arc segments near the second air inlet 121, so as to facilitate the electric arc to smoothly enter the first air inlet 111 and the second air inlet 121 and be extinguished in time.

For the description of the first arc extinguishing chamber 110, the second arc extinguishing chamber 120, the arc cutting plate 140 and the other aspects of the insulating member 130 in the arc extinguishing device 10 with the above-mentioned structure, reference may be made to the arc extinguishing device 10 with the above-mentioned first structure, and the description of the present application is omitted here.

It can be understood that, in the arc extinguishing device 10 provided with the first magnetism enhancing member 150 and the second magnetism enhancing member 160, the first arc guiding surface 131 may be further disposed on a side of the insulating member 130 located on the first side of the arc cutting plate 140, which is close to the first arc extinguishing chamber 110; a second arc guiding surface 132 is disposed at a side of the insulating member 130, which is adjacent to the second arc extinguishing chamber 120, at a portion of the second side of the arc cutting plate 140; the first guiding cambered surface 131 and the second guiding cambered surface 132 are rounded or chamfered. Reference is made to the foregoing for specific arrangement of the first guide arc surface 131 and the second guide arc surface 132.

In addition, in the arc extinguishing device 10 provided with the first magnetism increasing member 150 and the second magnetism increasing member 160, the projection of the portion of the insulating member 130 located on the first side of the arc cutting plate 140 along the first direction X may also at least partially overlap with the second arc extinguishing chamber 120; the projection of the portion of the insulating member 130 located at the second side of the arc cutting plate 140 along the first direction X may also at least partially overlap the first arc chute 110. Reference is also made to the foregoing for a structural description of this part.

The specific structures of the first and second magnetism enhancing members 150 and 160 will be described in detail below. The first magnetization member 150 and the second magnetization member 160 can have various structures. The following describes the structure of the two first and second magnetic members 150 and 160 with reference to fig. 6 and 7.

As shown in fig. 6, in some embodiments, the first magnetism increasing member 150 includes a plurality of first magnetism increasing plates 151, each of the first magnetism increasing plates 151 is connected to the arc extinguishing gate of the first arc extinguishing chamber 110 in a one-to-one manner, and a gap is provided between adjacent first magnetism increasing plates 151; the second magnetism increasing member 160 includes a plurality of second magnetism increasing plates 161, each second magnetism increasing plate 161 is connected to the arc extinguishing gate of the second arc extinguishing chamber 120 one to one, and a gap is formed between adjacent second magnetism increasing plates 161.

The first magnetization plate 151 and the second magnetization plate 161 may have a plate structure.

Taking the first magnetism increasing plate 151 as an example, the number of the first magnetism increasing plates 151 may be the same as or less than the number of the arc extinguishing bars of the first arc extinguishing chamber 110, which is not limited in the embodiment of the present application.

Similarly, the number of the second magnetism increasing plates 161 may be the same as or less than the number of the arc extinguishing bars of the second arc extinguishing chamber 120, which is not limited in the embodiment of the present application.

In addition, the first magnetism increasing plate 151 may be disposed at the furthest edge of the first air inlet 111 from the second air inlet 121 in the direction in which the first and second arc extinguishing chambers 110 and 120 are juxtaposed, and the second magnetism increasing plate 161 may be disposed at the furthest edge of the second air inlet 121 from the first air inlet 111, thereby reducing the shielding of the first air inlet 111 by the first magnetism increasing plate 151 and the shielding of the second air inlet 121 by the second magnetism increasing plate 161 so that an arc smoothly enters the first air inlet 111 or the second air inlet 121.

In addition, there may be various connection methods for one-to-one connection between the first magnetism increasing plate 151 and the arc extinguishing gate of the first arc extinguishing chamber 110.

For example, in some embodiments, the connected first magnetically enhanced plates 151 are integrally provided with the arc chute plates of the first arc chute 110.

In other embodiments, the connected first magnetism increasing plate 151 is connected to the arc chute of the first arc chute 110 by welding.

Likewise, the one-to-one connection between the second magnetism increasing plate 161 and the arc extinguishing gate of the second arc extinguishing chamber 120 may have various connection methods, such as integral arrangement or welding.

The connection mode of the integrated arrangement makes the structure of the arc extinguishing device 10 simpler, and the arc extinguishing device 10 is convenient to process and manufacture.

The magnetization principle of the first magnetization member 150 and the second magnetization member 160 with the above structure is: after the first arc segment enters the first arc extinguishing chamber 110, a magnetic field is generated around the arc under the action of the arc extinguishing grid sheet and the plurality of first magnetism increasing plates 151; after the second arc segment enters the second arc chute 120, a magnetic field is generated around the arc by the arc chute plates and the plurality of second magnetically enhanced plates 161. The magnetic fields generated by the first arc segment and the second arc segment are superimposed around them so that the arc in the region where the first magnetism enhancing member 150 and the second magnetism enhancing member 160 are opposite is more easily driven to the first arc extinguishing chamber 110 and the second arc extinguishing chamber 120.

As shown in fig. 7, in other embodiments, the first magnetism increasing member 150 includes a first magnetic conduction plate 152, where the first magnetic conduction plate 152 is disposed along the arrangement direction of the plurality of arc extinguishing gate sheets of the first arc extinguishing chamber 110, and the first magnetic conduction plate 152 is disposed in an insulating manner between the plurality of arc extinguishing gate sheets of the first arc extinguishing chamber 110; the second magnetism increasing member 160 includes a second magnetism guiding plate 162, where the second magnetism guiding plate 162 is disposed along an arrangement direction of the plurality of arc extinguishing bars of the second arc extinguishing chamber 120, and the second magnetism guiding plate 162 is disposed with insulation between the plurality of arc extinguishing bars of the second arc extinguishing chamber 120.

The first and second magnetic conductive plates 152 and 162 may each be made of a magnetic material. For example, one or more of iron, cobalt, nickel.

The first magnetic conduction plate 152 and the plurality of arc extinguishing bars of the first arc extinguishing chamber 110 may be insulated from each other by coating an insulating layer on the outer circumference of the first magnetic conduction plate 152.

The insulating arrangement between the first magnetic conduction plate 152 and the plurality of arc extinguishing bars of the first arc extinguishing chamber 110 can prevent the plurality of arc extinguishing bars of the first arc extinguishing chamber 110 from being electrically connected through the first magnetic conduction plate 152, so that after the first arc section enters the first arc extinguishing chamber 110, short circuit is caused to a loop where an arc is located, and the voltage rise of the first arc section is affected.

Similarly, the insulating arrangement between the second magnetically permeable plate 162 and the plurality of arc chute plates of the second arc chute 120 may have a similar structure and function.

The magnetization principle of the first magnetization member 150 and the second magnetization member 160 with the above structure is: the arc can generate a magnetic field between the first and second magnetic conductive plates 152 and 162 such that the magnetic field strength in the opposite region thereof becomes large, and the arc located in the region is more easily driven to the first and second arc extinguishing chambers 110 and 120.

As shown in fig. 6 and 7, in some embodiments, along the parallel direction Y of the first arc extinguishing chamber 110 and the second arc extinguishing chamber 120, the projection of the first magnetism increasing member 150 is not overlapped with the projection of the arc extinguishing gate sheet of the first arc extinguishing chamber 110 and the projection of the arc extinguishing gate sheet of the second arc extinguishing chamber 120, and the projection of the second magnetism increasing member 160 is not overlapped with the projection of the arc extinguishing gate sheet of the first arc extinguishing chamber 110 and the projection of the arc extinguishing gate sheet of the second arc extinguishing chamber 120.

The parallel direction Y of the first arc extinguishing chamber 110 and the second arc extinguishing chamber 120, i.e., the direction in which the first magnetism increasing member 150 and the second magnetism increasing member 160 are opposite. In this direction, the projection of the first magnetism increasing member 150 is not overlapped with the projections of the arc extinguishing gate sheet of the first arc extinguishing chamber 110 and the arc extinguishing gate sheet of the second arc extinguishing chamber 120, and the projection of the second magnetism increasing member 160 is not overlapped with the projections of the arc extinguishing gate sheet of the first arc extinguishing chamber 110 and the arc extinguishing gate sheet of the second arc extinguishing chamber 120, which is equivalent to that the arc extinguishing gate sheet of the first arc extinguishing chamber 110 and the arc extinguishing gate sheet of the second arc extinguishing chamber 120 are not located in the opposite areas of the first magnetism increasing member 150 and the second magnetism increasing member 160.

In this way, the contact assembly 20 of the circuit breaker may be disposed in a region where the first magnetism enhancing member 150 and the second magnetism enhancing member 160 are opposite, and since the intensity of the magnetic field in the region is maximized, when the contact assembly 20 generates an arc in the region, the arc can be subjected to a strong magnetic driving force, thereby rapidly entering the first arc extinguishing chamber 110 and the second arc extinguishing chamber 120. In addition, after the electric arc is subjected to the magnetic driving force, the electric arc is stretched first, and the electric arc is not likely to enter the arc extinguishing chamber until the electric arc moves out of the area where the first magnetism enhancing part 150 and the second magnetism enhancing part 160 are opposite, and in the area, the arc extinguishing grid sheet does not obstruct the electric arc, so that the resistance of the electric arc in the stretching process is reduced, the stretched length of the electric arc is longer, the voltage is higher, and the electric arc is easy to extinguish.

Referring to fig. 8, fig. 8 is a schematic structural diagram of another arc extinguishing device according to an embodiment of the present application. As shown in fig. 8, in some embodiments, the arc extinguishing device 10 may further include a first striking member 170, a second striking member 180, and a bridging striking member 190, wherein the first striking member 170 is disposed at one end of the first arc extinguishing chamber 110 in the arrangement direction of the arc extinguishing bars, and the second striking member 180 is disposed at one end of the second arc extinguishing chamber 120 in the arrangement direction of the arc extinguishing bars; the bridging arc striking piece 190 is arranged between the first arc striking piece 170 and the second arc striking piece 180, the bridging arc striking piece 190 comprises a first bridge arm 191 and a second bridge arm 192 which are connected, the first bridge arm 191 is arranged at the other end of the first arc extinguishing chamber 110 in the arrangement direction of the arc extinguishing grid sheets, and forms a first arc running channel with the first arc striking piece 170 in the first arc extinguishing chamber 110; the second bridge arm 192 is disposed at the other end of the second arc extinguishing chamber 120 in the arrangement direction of the arc extinguishing bars, and forms a second arc running channel with the second arc striking member 180 in the second arc extinguishing chamber 120.

When the arc is generated outside the first air inlet 111 and the second air inlet 121, a part of the arc can enter the first arc extinguishing chamber 110 along the first arc running channel, another part of the arc can enter the second arc extinguishing chamber 120 along the second arc running channel, and the connection part of the first bridge arm 191 and the second bridge arm 192 can connect the first arc extinguishing chamber 110 and the second arc extinguishing chamber 120 in series, so that the resistance in the arc extinguishing assembly is increased, the arc voltage is increased, and then the arc can be extinguished quickly by the arc extinguishing device 10.

In the above-described circuit breaker structure, the bridging striking member 190 functions to guide an arc and to achieve an electrical connection between the first arc extinguishing chamber 110 and the second arc extinguishing chamber 120.

As shown in fig. 8, in some embodiments, first leg 191 and second leg 192 are each connected to arc cutting plate 140. At this time, arc cutting plate 140 serves as a connection point between first arm 191 and second arm 192.

The application also provides a circuit breaker, referring to fig. 9, fig. 9 is a schematic diagram of a partial structure of the circuit breaker. As shown in fig. 9, the circuit breaker includes: the contact assembly 20 and the arc chute 10 of any of the embodiments of the subject matter described above; the contact assembly 20 is disposed outside the first air inlet 111 and/or the second air inlet 121.

The contact assembly 20 includes at least one fixed contact 210 and one moving contact 220, and the fixed contact 210 is disposed opposite to the moving contact 220, and contacts when closed and separates when opened.

The contact assembly 20 being disposed outside the first air inlet 111 and/or the second air inlet 121 means that the contact assembly 20 may be disposed entirely outside the first air inlet 111, entirely outside the second air inlet 121, or partially outside the first air inlet 111 and partially outside the second air inlet 121. The first air inlet 111 is located opposite to the first air inlet 111 along the first direction X, and the second air inlet 121 is located opposite to the second air inlet 121 along the second direction X. Of course, the contact assembly 20 is disposed outside the first air inlet 111 and/or the second air inlet 121, and it is not excluded that the contact assembly 20 is also partially disposed directly opposite the region between the first air inlet 111 and the second air inlet 121.

Through adopting above-mentioned scheme, contact assembly 20 is in the in-process of separating brake and closing a floodgate, the electric arc that produces can be cut into first arc section and second arc section by arc cutting board 140, first arc section enters into first explosion chamber 110 fast, second arc section enters into second explosion chamber 120 fast, when first explosion chamber 110 and second explosion chamber 120 establish ties, the total length that the electric arc was stretched is equivalent to the sum of the length that first arc section was stretched and the length that second arc section was stretched, reach the purpose of quick rising arc voltage, thereby quench the electric arc, prevent that the electric arc from being difficult to in time quench and burn the structure of circuit breaker.

In summary, in the arc extinguishing device 10 according to the embodiment of the present application, the insulating member 130 is disposed, and the insulating member 130 is at least partially disposed between the first air inlet 111 and the second air inlet 121, and the projection of the portion of the insulating member 130 located on the first side of the arc cutting plate 140 along the first direction X is not overlapped with the first arc extinguishing chamber 110; the projection of the portion of the insulating member 130 located on the second side of the arc cutting plate 140 in the first direction X does not overlap the second arc chute 120, thereby reducing the shielding of the first air inlet 111 by the portion of the insulating member 130 located on the first side of the arc cutting plate 140, which is advantageous for reducing the aggregation of the first arc segments near the first air inlet 111, and reducing the shielding of the second air inlet 121 by the portion of the insulating member 130 located on the second side of the arc cutting plate 140, which is advantageous for reducing the aggregation of the second arc segments near the second air inlet 121. The first arc section is cut and elongated in the first arc-extinguishing chamber 110, the second arc section is cut and elongated in the second arc-extinguishing chamber 120, and when the first arc-extinguishing chamber 110 and the second arc-extinguishing chamber 120 are connected in series, the total length of the stretched electric arc is equal to the sum of the stretched length of the first arc section and the stretched length of the second arc section, so that the aim of rapidly extinguishing the electric arc is fulfilled, and the electric arc is prevented from being difficult to extinguish in time to burn structural members of the circuit breaker.

Those skilled in the art will appreciate that while some embodiments herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An arc extinguishing device, characterized by comprising:

a first arc extinguishing chamber having a first air inlet facing a first direction;

the second arc-extinguishing chamber is arranged in parallel with the first arc-extinguishing chamber and is provided with a second air inlet facing the first direction;

The arc cutting plate is arranged outside the first air inlet and the second air inlet so as to divide an electric arc into a first arc section and a second arc section along the length direction, the first arc section is positioned on the first side of the arc cutting plate, and the second arc section is positioned on the second side of the arc cutting plate;

the insulating piece is positioned between the first arc-extinguishing chamber and the second arc-extinguishing chamber and at least partially arranged between the first air inlet and the second air inlet, and the projection of the part of the insulating piece positioned on the first side of the arc cutting plate along the first direction is not overlapped with the first arc-extinguishing chamber, so that the first arc section enters the first arc-extinguishing chamber from the first air inlet; the projection of the part of the insulating piece, which is positioned on the second side of the arc cutting plate, along the first direction is not overlapped with the second arc extinguishing chamber, so that the second arc section enters the second arc extinguishing chamber from the second air inlet.

2. The arc extinguishing device according to claim 1, wherein a portion of the insulating member located on the first side of the arc cutting plate is provided with a first arc guiding surface on a side close to the first arc extinguishing chamber;

a second arc guide surface is arranged on one side, close to the second arc extinguishing chamber, of the part, located on the second side, of the arc cutting plate, of the insulating piece;

The first guide cambered surface and the second guide cambered surface are fillets or chamfers.

3. The arc chute of claim 1 wherein a projection of a portion of the insulator on the first side of the arc plate along the first direction at least partially overlaps the second arc chute;

a projection of a portion of the insulating member on the second side of the arc cutting plate along the first direction at least partially overlaps the first arc extinguishing chamber.

4. An arc extinguishing device, characterized by comprising:

the first magnetism increasing piece is arranged at one side of the first air inlet far away from the second air inlet;

the second magnetism increasing piece is arranged at one side of the second air inlet far away from the first air inlet;

The insulation piece is positioned between the first arc extinguishing chamber and the second arc extinguishing chamber and at least partially arranged between the first air inlet and the second air inlet, and the width of the overlapping part of the insulation piece positioned on the first side of the arc cutting plate along the first direction and the first arc extinguishing chamber is smaller than the width of the projection of the first magnetism increasing piece along the first direction, so that the first arc section enters the first arc extinguishing chamber from the first air inlet; the width of the overlapping part of the insulating piece, which is positioned at the second side of the arc cutting plate and is along the first direction, and the second arc extinguishing chamber is smaller than the width of the second magnetism increasing piece, which is projected along the first direction, so that the second arc segment enters the second arc extinguishing chamber from the second air inlet.

5. The arc extinguishing device according to claim 4, wherein a portion of the insulating member located on the first side of the arc cutting plate is provided with a first arc guiding surface on a side close to the first arc extinguishing chamber;

6. The arc chute of claim 4 wherein the projection of the portion of the insulator on the first side of the arc plate along the first direction at least partially overlaps the second arc chute;

7. The arc extinguishing device according to claim 4, wherein, along a parallel direction of the first arc extinguishing chamber and the second arc extinguishing chamber, a projection of the first magnetism increasing member is not overlapped with a projection of the arc extinguishing gate sheet of the first arc extinguishing chamber and a projection of the arc extinguishing gate sheet of the second arc extinguishing chamber, and a projection of the second magnetism increasing member is not overlapped with a projection of the arc extinguishing gate sheet of the first arc extinguishing chamber and a projection of the arc extinguishing gate sheet of the second arc extinguishing chamber.

8. The arc extinguishing device according to claim 4, wherein the first magnetism increasing member comprises a plurality of first magnetism increasing plates, each first magnetism increasing plate is connected with the arc extinguishing grid plates of the first arc extinguishing chamber one to one, and gaps are arranged between adjacent first magnetism increasing plates;

the second magnetism increasing piece comprises a plurality of second magnetism increasing plates, each second magnetism increasing plate is connected with the arc extinguishing grid plates of the second arc extinguishing chamber one to one, and gaps are reserved between the adjacent second magnetism increasing plates.

9. The arc chute of claim 8 wherein the first magnetically enhanced plate connected is integrally formed with the arc chute of the first arc chute;

the second magnetism increasing plate connected with the second arc extinguishing chamber is integrally arranged with the arc extinguishing gate sheet of the second arc extinguishing chamber.

10. The arc extinguishing device according to claim 4, wherein the first magnetism increasing member includes a first magnetism conducting plate, the first magnetism conducting plate is disposed along an arrangement direction of a plurality of arc extinguishing bars of the first arc extinguishing chamber, and the first magnetism conducting plate is disposed in an insulating manner with the plurality of arc extinguishing bars of the first arc extinguishing chamber;

the second magnetism increasing piece comprises a second magnetism conducting plate, the second magnetism conducting plate is arranged along the arrangement direction of a plurality of arc extinguishing grid plates of the second arc extinguishing chamber, and the second magnetism conducting plate is arranged in an insulating mode with the plurality of arc extinguishing grid plates of the second arc extinguishing chamber.

11. A circuit breaker, comprising: a contact assembly and an arc extinguishing device according to any one of claims 1-10;

the contact assembly is arranged outside the first air inlet and/or the second air inlet.