An arc quenching system and double-break circuit breaker

Abstract

The application relates to the technical field of circuit breakers, in particular to an arc extinguishing system and a double-break circuit breaker. The arc extinguishing system comprises a first contact assembly, a second contact assembly, an arc extinguishing chamber, a first arc plate and a second arc plate. The first contact assembly and the second contact assembly are arranged in parallel in the double-break circuit breaker. The arc extinguishing chamber is arranged between the first contact assembly and the second contact assembly. One end of the first arc plate is located at the bottom of the arc extinguishing chamber. The other end of the first arc plate is close to the first contact assembly. One end of the second arc plate is located at the bottom of the arc extinguishing chamber. The other end of the second arc plate is close to the second contact assembly. The first arc plate is provided with a first magnetic coil. The second arc plate is provided with a second magnetic coil. The first magnetic coil is electrically connected with the second magnetic coil, and the rotation directions of the first magnetic coil and the second magnetic coil are opposite. The application realizes synchronous magnetic blowing guidance of double arcs, and the controllability of the arc movement direction is enhanced through the cooperation of the reverse magnetic fields, so that the arc extinguishing efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of circuit breaker technology, and in particular to an arc extinguishing system and a double-break circuit breaker. Background Technology

[0002] A circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions, and capable of closing, carrying, and interrupting current under abnormal circuit conditions within a specified time. Circuit breakers are equipped with an arc-extinguishing system, which typically includes contact assemblies and an arc-extinguishing chamber.

[0003] With the development of the industry, the demand for DC circuit breakers is increasing. DC circuit breakers have higher voltage loads, so in the original circuit breaker structure, the principle of series voltage division is used to convert single-break circuit breakers into double-break circuit breakers. However, existing double-break circuit breakers suffer from poor arc extinguishing efficiency. Utility Model Content

[0004] This application provides an arc extinguishing system and a double-break circuit breaker to improve the arc extinguishing efficiency of the double-break circuit breaker.

[0005] In a first aspect, this application provides an arc-extinguishing system comprising: a first contact assembly, a second contact assembly, an arc-extinguishing chamber, a first arc-starting plate, and a second arc-starting plate. The first and second contact assemblies are arranged parallel to each other in a first direction within a double-break circuit breaker. The arc-extinguishing chamber is disposed between the first and second contact assemblies and includes a top and a bottom opposite each other in a second direction, wherein the second direction is perpendicular to the first direction. One end of the first arc-starting plate is located at the bottom of the arc-extinguishing chamber. The other end of the first arc-starting plate is close to the first contact assembly. One end of the second arc-starting plate is located at the bottom of the arc-extinguishing chamber. The other end of the second arc-starting plate is close to the second contact assembly. A first magnetic coil is disposed on the side of the first arc-starting plate away from the first contact assembly. A second magnetic coil is disposed on the side of the second arc-starting plate away from the second contact assembly. The first magnetic coil and the second magnetic coil are electrically connected, and the first and second magnetic coils rotate in opposite directions.

[0006] The arc-extinguishing system provided in the first aspect of this application achieves synchronous magnetic blow-out guidance for double-break arcs. The synergistic effect of the opposing magnetic fields enhances the controllability of the arc movement direction, and the complementary distribution of the magnetic fields avoids arc deflection caused by a unilateral magnetic field, ensuring the consistency of the arc transfer path at both breaks. This design significantly improves the magnetic blow-out intensity under the same space constraints, thereby achieving the goal of improving the arc-extinguishing efficiency of double-break circuit breakers.

[0007] In one possible design, the first contact assembly and the second contact assembly each include a moving contact. The first arc-starting plate includes a first section, a second section, and a third section. The first section is located near the moving contact of the first contact assembly. One end of the second section is connected to the first section. The third section is located at the bottom of the arc-extinguishing chamber and is connected to the other end of the second section. A first magnetic coil is disposed on the second section. The second arc-starting plate includes a fourth section, a fifth section, and a sixth section. The fourth section is located near the moving contact of the second contact assembly. One end of the fifth section is connected to the fourth section. The sixth section is located at the bottom of the arc-extinguishing chamber and is connected to the other end of the fifth section. A second magnetic coil is disposed on the fifth section.

[0008] Based on the description of the above embodiments, this application enables the arc to quickly detach from the contact area after separation from the contact and enter the arc-extinguishing chamber along a predetermined path under the acceleration of the magnetic field, effectively shortening the arc dwell time. The coordinated arrangement of the segmented arc-initiating plate and the magnetic coil enhances the magnetic field strength in the middle section of the arc's movement, preventing the arc from bouncing back or stalling during transfer. Because the magnetic coils are arranged in the second and fifth sections, far from the moving contact, interference with the magnetic field distribution in the initial stage of the arc is avoided, while a stronger magnetic blowout effect is formed in the middle section of the path. The symmetrical arc-initiating structure and the reverse magnetic coil arrangement make the magnetic field distribution in the double-break arc-extinguishing path more uniform, and ensure that the two arc-extinguishing paths of the double-break structure receive a balanced magnetic blowout force. This effectively improves the arc-extinguishing efficiency of the double-break circuit breaker.

[0009] In one possible design, a magnetizing block is inserted into the first magnetic coil and / or the second magnetic coil.

[0010] Based on the description of the above embodiments, when current flows through the magnetic coil, the high permeability of the magnetizing block causes the magnetic lines of force to form a dense path within it. This flux concentration effect significantly enhances the axial magnetic field strength of the coil, thereby increasing the Lorentz force acting on the arc. During the operation of the double-break circuit breaker, the enhanced magnetic field accelerates the arc's movement from the contact separation point to the arc-extinguishing chamber, shortening the arc dwell time. The internal arrangement of the magnetizing block does not require changing the original winding parameters of the coil, and avoids adding an external magnetic circuit structure within the narrow space of the circuit breaker. In this way, the magnetic field strength can be increased under the same current conditions without occupying additional installation space.

[0011] In one possible design, the magnetizing block is a cylinder.

[0012] Based on the description of the above embodiments, the cylindrical magnetizing block is arranged coaxially with the winding direction of the magnetic coil along the axial direction, and its circumferential symmetry maximizes the conduction efficiency of magnetic flux. When current passes through the magnetic coil, the smooth surface of the cylinder reduces the possibility of local magnetic field concentration, thereby uniformly enhancing the magnetic blow-out force. In addition, the planar contact between the end face of the cylinder and the coil frame reduces the assembly gap, reduces magnetic flux leakage, and makes the magnetic field distribution more uniform and stronger, thereby effectively enhancing the magnetic blow-out effect on the arc, accelerating the transfer speed of the arc to the arc-extinguishing chamber, and ultimately improving the arc-extinguishing efficiency of the double-break circuit breaker.

[0013] In one possible design, a magnetic shielding plate is placed between the first magnetic coil and the second magnetic coil. The magnetic shielding plate is a magnetic metal plate.

[0014] Based on the description of the above embodiments, since the magnetic shielding plate itself forms a closed magnetic circuit, the magnetic fields generated by the two coils are confined to the vicinity of their respective contact assemblies. This reduces magnetic field interference between the two magnetic coils, allowing the arc to be quickly introduced into the arc-extinguishing chamber during the breaking process, thus improving arc-extinguishing efficiency. Simultaneously, through the magnetic circuit guidance effect of the magnetic metal plate, efficient utilization of the magnetic field can be achieved within a limited space, ensuring that the compactness of the double-break structure is not affected.

[0015] In one possible design, an electrical connection channel connects the first and second magnetic coils. This electrical connection channel is a U-shaped groove structure. A magnetic shielding plate is snapped into the U-shaped groove. The bottom of the U-shaped groove protrudes beyond the outer surface of the first magnetic coil, so that the projection of the magnetic shielding plate onto the first magnetic coil completely covers it. The bottom of the U-shaped groove protrudes beyond the outer surface of the second magnetic coil, so that the projection of the magnetic shielding plate onto the second magnetic coil completely covers it.

[0016] Based on the description of the above embodiments, this solution achieves omnidirectional shielding of the magnetic field within the same installation space through a combination structure of a U-shaped groove and a magnetic shielding plate. Simultaneously, the protruding design at the bottom of the groove enhances the vertical coverage and sealing, preventing localized magnetic field leakage due to assembly errors. This allows for strict confinement of the interaction area of ​​two opposing magnetic fields within a predetermined range within the limited space of a double-break circuit breaker, eliminating magnetic field cancellation and ensuring that the arc rapidly enters the arc-extinguishing chamber along a set trajectory under the action of magnetic blowing force, thereby improving arc-extinguishing efficiency.

[0017] In one possible design, the first contact assembly and the second contact assembly each include a stationary contact. A first angle exists between the second segment and the end of the stationary contact of the first contact assembly. The first angle is greater than or equal to 90° and less than or equal to 120°. A second angle exists between the fifth segment and the end of the stationary contact of the second contact assembly. The second angle is greater than or equal to 90° and less than or equal to 120°.

[0018] Based on the description of the above embodiments, this application solves the problems of insufficient arc transfer speed and inability to extinguish smoothly caused by unreasonable angles between the first arc-initiating plate / second arc-initiating plate and the stationary contact. By optimizing the angle parameters, the arc is directly driven by a force pointing into the arc-extinguishing chamber after leaving the contact, which improves the path stability of the arc entering the arc-extinguishing grid and thus improves the arc-extinguishing efficiency of the double-break circuit breaker.

[0019] In one possible design, the arc-extinguishing chamber includes multiple arc-extinguishing grids stacked along a second direction, with an arc-extinguishing gap between adjacent grids. A third section is parallel to the arc-extinguishing grids, and an arc-extinguishing gap exists between the third section and the bottom of the arc-extinguishing chamber. A sixth section is parallel to the arc-extinguishing grids, and an arc-extinguishing gap exists between the sixth section and the bottom of the arc-extinguishing chamber.

[0020] Based on the description of the above embodiments, this solution forms a multi-level segmentation channel by directional stacking of arc-extinguishing grid plates. Combined with the optimized design of the end gap of the arc-initiating plate, a continuous arc guiding and segmentation path is constructed, achieving rapid arc introduction and efficient segmentation within the arc-extinguishing chamber, effectively reducing the risk of arc energy accumulation within the chamber. The multi-layered arrangement of the arc-extinguishing grid plates improves arc segmentation efficiency. Both the third and sixth segments are parallel to the arc-extinguishing grid plates, and both have arc-extinguishing gaps between them and the bottom of the arc-extinguishing chamber. This allows the third and sixth segments to function as arc-extinguishing grid plates, enabling the reuse of both the first and second arc-initiating plates and increasing the number of arc-extinguishing grid plates within the chamber, thereby improving the arc-extinguishing speed and reliability of the double-break circuit breaker.

[0021] In one possible design, the first segment extends along the second direction, and the projection of the first segment onto the moving contact of the first contact assembly completely covers the end of the moving contact of the first contact assembly. The fourth segment extends along the second direction, and the projection of the fourth segment onto the moving contact of the second contact assembly completely covers the end of the moving contact of the second contact assembly.

[0022] Based on the description of the above embodiments, this solution optimizes the spatial layout so that the arc-starting plate forms a complete arc transfer path at the moment the contacts break, eliminating the arc dwell time at the contact end and realizing the rapid transfer of the arc from the contact separation point to the arc-extinguishing chamber. This solves the problem of aggravated contact erosion caused by arc dwell and reduces the probability of arc reignition, significantly improving the breaking reliability of the double-break circuit breaker.

[0023] Secondly, this application provides a dual-break circuit breaker, including the arc extinguishing system described in any of the above embodiments.

[0024] The beneficial effects of the double-break circuit breaker provided in the second aspect and the various possible designs of the second aspect can be found in the first aspect and the various possible implementations of the first aspect, and will not be repeated here. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of an arc extinguishing system according to an embodiment of this application.

[0027] Figure 2 for Figure 1 A view from another direction.

[0028] Figure 3 This is a schematic diagram of the assembly of the first arc-starting plate, the second arc-starting plate, the first magnetic coil, and the second magnetic coil in the embodiments of this application.

[0029] Figure 4 for Figure 1 An enlarged view of section A.

[0030] Figure 5 for Figure 2 A magnified view in section B.

[0031] Figure 6 This is a schematic diagram of the assembly of the magnetic shielding plate in an embodiment of this application.

[0032] Explanation of reference numerals in the attached figures: 1-First contact assembly; 2-Second contact assembly; 01-Moving contact; 02-Stationary contact; 3-Arc extinguishing chamber; 31-Arc extinguishing grid; 4-First arc-initiating plate; 41-First section; 42-Second section; 43-Third section; 5-Second arc-initiating plate; 51-Fourth section; 52-Fifth section; 53-Sixth section; 6-First magnetic coil; 7-Second magnetic coil; 8-Magnetic enhancement block; 9-Magnetic shielding plate; 10-Electrical connection channel; c-First angle; d-Second angle; X-First direction; Y-Second direction. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] Unless otherwise defined, 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 herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0035] The terms "comprising" and "having," and any variations thereof, used in the specification, claims, and drawings of this application are intended to cover without excluding other meanings. The words "a" or "an" do not exclude the presence of multiples.

[0036] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0037] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0038] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. For example, in the description of this application, terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0039] Furthermore, the descriptions of directions such as the X direction, Y direction, and Z direction used to explain the operation and construction of the components in this embodiment are not absolute but relative. Although these directions are appropriate when the components are in the positions shown in the figure, they should be interpreted differently when these positions change to correspond to the changes.

[0040] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0041] In the description of this application, unless otherwise stated, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).

[0042] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, "connection" or "linkage" in mechanical structures can refer to a physical connection, such as a fixed connection, for example, a connection fixed by fasteners, such as a connection fixed by screws, bolts, or other fasteners; a physical connection can also be a detachable connection, such as a snap-fit ​​or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. In circuit structures, "connection" or "linkage" can refer not only to a physical connection but also to an electrical connection or a signal connection. For example, it can be a direct connection, i.e., a physical connection, or an indirect connection through at least one intermediate component, as long as the circuit is connected; it can also refer to the internal connection of two components. Signal connection can refer not only to signal connection through a circuit but also to signal connection through a media, such as radio waves. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] In existing technologies, DC circuit breakers often employ a double-break structure to achieve series voltage division due to increased high-voltage load demands. Traditional double-break circuit breakers, limited by internal space, have compressed arc-quenching plate thickness, resulting in insufficient magnetic blow-out effect. The arc's transfer speed decreases during breaking, making it difficult to quickly enter the arc-extinguishing chamber, thus prolonging the arc dwell time. In high-voltage DC circuits, this dwell time can easily lead to contact erosion and arc-extinguishing grid carbonization, affecting the circuit breaker's service life.

[0044] Therefore, to solve the above problems, this application provides an arc-extinguishing system and a double-break circuit breaker including this arc-extinguishing system. To enable those skilled in the art to better understand the solution of this application, the following will be described in conjunction with the appendix. Figure 1-6The technical solutions in the embodiments of this application will be clearly and completely described.

[0045] like Figure 1 and Figure 2 As shown, this application provides an arc-extinguishing system, which includes: a first contact assembly 1, a second contact assembly 2, an arc-extinguishing chamber 3, a first arc-starting plate 4, and a second arc-starting plate 5. The first contact assembly 1 and the second contact assembly 2 are arranged parallel to each other along a first direction X in a double-break circuit breaker. The arc-extinguishing chamber 3 is disposed between the first contact assembly 1 and the second contact assembly 2, and includes a top and a bottom opposite each other in a second direction Y. The second direction Y is perpendicular to the first direction X. One end of the first arc-starting plate 4 is located at the bottom of the arc-extinguishing chamber 3. The other end of the first arc-starting plate 4 is close to the first contact assembly 1. One end of the second arc-starting plate 5 is located at the bottom of the arc-extinguishing chamber 3. The other end of the second arc-starting plate 5 is close to the second contact assembly 2. A first magnetic coil 6 is disposed on the side of the first arc-starting plate 4 away from the first contact assembly 1. A second magnetic coil 7 is disposed on the side of the second arc-starting plate 5 away from the second contact assembly 2. The first magnetic coil 6 and the second magnetic coil 7 are electrically connected, and the rotation directions of the first magnetic coil 6 and the second magnetic coil 7 are opposite.

[0046] Among them, such as Figure 3 The first direction X is indicated in the diagram, and the first direction X refers to the parallel arrangement direction of the two contact assemblies in the double-break circuit breaker. The first contact assembly 1 and the second contact assembly 2 are arranged in parallel, which can make the first contact assembly 1 and the second contact assembly 2 form a symmetrical breaking structure.

[0047] The top and bottom of the arc-extinguishing chamber 3 are arranged opposite each other along the second direction Y, which is perpendicular to the first direction X. For example, when the first direction X is horizontal, the second direction Y is vertical. This layout optimizes the spatial relationship between the arc-extinguishing chamber 3 and the contact assembly.

[0048] The arc-starting plate has one end near the contact assembly for capturing the arc initiation point, and the other end extends to the bottom of the arc-extinguishing chamber 3 to form an arc transfer channel.

[0049] In this context, "opposite rotation of the magnetic coils" means that the winding directions of the coils are mirror images of each other. For example, if the first magnetic coil 6 is wound clockwise, the second magnetic coil 7 can be wound counterclockwise. By matching the current direction with the rotation direction, complementary magnetic fields are generated. "Electrical connection" means that the two magnetic coils are connected in series or in parallel to form a closed loop, ensuring that the current direction and the magnetic field direction are coordinated.

[0050] Specifically, when the contacts break and generate an arc, the first arc-initiating plate 4 and the second arc-initiating plate 5 guide the two broken arcs to move into the arc-extinguishing chamber 3, respectively. While the arcs are guided by the first and second arc-initiating plates 4 and 5, the first magnetic coil 6 and the second magnetic coil 7 can be energized. Since the first magnetic coil 6 and the second magnetic coil 7 have opposite rotation directions and the same current direction, they can generate magnetic fields in opposite directions. The magnetic field of the first magnetic coil 6 acts on the first broken arc, and the magnetic field of the second magnetic coil 7 acts on the second broken arc. This causes the first broken arc to move away from the second arc-initiating plate 5, and the second broken arc to move away from the first arc-initiating plate 4. Simultaneously, under the action of the Lorentz force, both arcs move synchronously towards the central region of the arc-extinguishing chamber 3.

[0051] Through the above technical solution, this application achieves synchronous magnetic blow-out guidance for double-break arcs. The synergistic effect of the opposing magnetic fields enhances the controllability of the arc movement direction, and the complementary distribution of the magnetic fields avoids arc deflection caused by a unilateral magnetic field, ensuring the consistency of the arc transfer path at both breaks. This design significantly improves the magnetic blow-out intensity under the same spatial constraints, thereby achieving the goal of improving the arc extinguishing efficiency of double-break circuit breakers.

[0052] Furthermore, in some embodiments, such as Figure 1 and Figure 2 As shown, the first contact assembly 1 and the second contact assembly 2 each include a moving contact 01. Figure 3 As shown, the first arc-starting plate 4 includes a first section 41, a second section 42, and a third section 43. The first section 41 is close to the moving contact 01 of the first contact assembly 1. One end of the second section 42 is connected to the first section 41. The third section 43 is located at the bottom of the arc-extinguishing chamber 3, and the third section 43 is connected to the other end of the second section 42. A first magnetic coil 6 is disposed on the second section 42. The second arc-starting plate 5 includes a fourth section 51, a fifth section 52, and a sixth section 53. The fourth section 51 is close to the moving contact 01 of the second contact assembly 2. One end of the fifth section 52 is connected to the fourth section 51. The sixth section 53 is located at the bottom of the arc-extinguishing chamber 3, and the sixth section 53 is connected to the other end of the fifth section 52. A second magnetic coil 7 is disposed on the fifth section 52.

[0053] The first section 41 refers to the metal guiding component that is close to and extends along the moving contact 01. The first section 41 can be formed by stamping copper alloy sheet. The function of the first section 41 is to directly capture the starting point of the electric arc generated when the moving contact 01 separates.

[0054] The second section 42 refers to the inclined transition structure connecting the first section 41 and the third section 43. Specifically, it can be a bent conductive sheet. The function of the second section 42 is to provide an installation position for the magnetic coil and form the middle section guide for the arc movement path.

[0055] The third section 43 refers to a horizontal guide plate that is parallel to the arc-extinguishing grid plate 31 and extends to the bottom of the arc-extinguishing chamber 3. Specifically, it can be a metal strip with the same width as the arc-extinguishing grid plate 31.

[0056] Since the first arc-initiating plate 4 and the second arc-initiating plate 5 have the same shape, the arrangement and function of the fourth section 51, the fifth section 52 and the sixth section 53 are the same as those of the first section 41, the second section 42 and the third section 43, respectively, and will not be described again here.

[0057] Specifically, when the moving contact 01 separates and generates an arc, the first section 41 and the fourth section 51 respectively approach the ends of the two moving contacts 01, directly capturing the starting position of the arc. After the arc is captured, it moves along the inclined path of the second section 42 and the fifth section 52. At this time, the first magnetic coil 6 and the second magnetic coil 7 are energized to generate a magnetic field, accelerating the arc towards the region of the arc-extinguishing grid 31. The third section 43 and the sixth section 53 extend to the bottom of the arc-extinguishing chamber 3 and remain parallel to the arc-extinguishing grid 31, ensuring that the arc is accurately guided into the gap between the multiple layers of arc-extinguishing grid 31.

[0058] Through the above technical solution, this application achieves rapid separation of the arc from the contact area after separation from the contact, and its entry into the arc-extinguishing chamber 3 along a predetermined path under the acceleration of the magnetic field, effectively shortening the arc dwell time. The coordinated arrangement of the segmented arc-initiating plate and the magnetic coil enhances the magnetic field strength in the middle section of the arc's movement, preventing the arc from bouncing back or stalling during transfer. Because the magnetic coils are arranged in the second section 42 and the fifth section 52, far from the moving contact 01, interference with the magnetic field distribution in the initial stage of the arc is avoided, while a stronger magnetic blow-out effect is formed in the middle section of the path. The symmetrical arc-initiating structure and the reverse magnetic coil arrangement make the magnetic field distribution in the double-break arc-extinguishing path more uniform, and ensure that the two arc-extinguishing paths of the double-break structure receive a balanced magnetic blow-out force. This effectively improves the arc-extinguishing efficiency of the double-break circuit breaker.

[0059] To increase the magnetic field strength of the first magnetic coil 6 and the second magnetic coil 7 when energized, in some embodiments, such as Figure 3 As shown, a magnetizing block 8 is inserted through the first magnetic coil 6 and / or the second magnetic coil 7.

[0060] The magnetizing block 8 refers to a solid structure made of a high-permeability material, specifically ferrite, silicon steel sheet, or nickel-iron alloy. The permeability of the magnetizing block 8 is higher than that of the winding material of the magnetic coil. By designing the magnetizing block 8, the magnetic field distribution can be changed through the material properties, so that the magnetic lines of force form a concentrated path inside the magnetizing block 8, thereby increasing the magnetic flux density.

[0061] The term "penetration" refers to the complete wrapping or partial embedding of the magnetizing block 8 within the winding of the magnetic coil, which can be achieved using a coaxial nesting method. This feature ensures that the magnetizing block 8 and the magnetic coil form a magnetic circuit coupling, allowing the magnetic field generated when the coil is energized to be preferentially conducted through the magnetizing block 8, thus avoiding magnetic leakage.

[0062] In summary, when current flows through the magnetic coil, the high permeability of the magnetizing block 8 causes the magnetic lines of force to form a dense path within it. This flux concentration effect significantly enhances the axial magnetic field strength of the coil, thereby increasing the Lorentz force acting on the arc. During the operation of the double-break circuit breaker, the enhanced magnetic field accelerates the arc's movement from the contact separation point into the arc-extinguishing chamber 3, shortening the arc's dwell time. The internal arrangement of the magnetizing block 8 does not require altering the original winding parameters of the coil and avoids adding an external magnetic circuit structure within the confined space of the circuit breaker. Thus, under the same current conditions, the magnetic field strength can be increased without occupying additional installation space.

[0063] Further, please continue to refer to Figure 3 As shown, in some embodiments, the magnetizing block 8 can be a cylinder.

[0064] A cylinder is a three-dimensional geometric body with axisymmetric properties. Its cross-section is circular and extends along the axial direction. It can be formed by machining metal materials. The axisymmetric properties of a cylinder enable the magnetic field to form a uniform ring distribution inside the magnetic coil, avoiding magnetic field distortion caused by sharp edges.

[0065] In summary, the cylindrical magnetizing block 8 is arranged coaxially with the winding direction of the magnetic coil along the axial direction, and its circumferential symmetry maximizes the magnetic flux conduction efficiency. When current passes through the magnetic coil, the smooth surface of the cylinder reduces the possibility of local magnetic field concentration, thereby uniformly enhancing the magnetic blow-out force. Furthermore, the planar contact between the end face of the cylinder and the coil frame reduces the assembly gap, decreases magnetic flux leakage, and makes the magnetic field distribution more uniform and stronger, effectively enhancing the magnetic blow-out effect on the arc, accelerating the transfer of the arc to the arc-extinguishing chamber 3, and ultimately improving the arc-extinguishing efficiency of the double-break circuit breaker.

[0066] To improve the reliability of double-break circuit breakers, such as Figure 4 and Figure 5 As shown, in some embodiments, a magnetic shielding plate 9 may be provided between the first magnetic coil 6 and the second magnetic coil 7. The magnetic shielding plate 9 may be a magnetic metal plate.

[0067] Among them, the magnetic shielding plate 9 refers to the plate-shaped component used to separate the magnetic fields between two magnetic coils. Specifically, it can be implemented by using a high-permeability iron-nickel alloy plate, which reduces mutual interference of magnetic fields by absorbing and redistributing the magnetic field lines.

[0068] Specifically, the magnetic shielding plate 9 is installed in the middle between the first magnetic coil 6 and the second magnetic coil 7, physically isolating the magnetic fields generated by the two coils through the magnetic metal material. When the first magnetic coil 6 and the second magnetic coil 7 are energized, the magnetic shielding plate 9 confines the magnetic field lines of the first magnetic coil 6 to its left side and the magnetic field lines of the second magnetic coil 7 to its right side, preventing the magnetic fields from superimposing or canceling each other in the middle area.

[0069] Through the above technical solution, since the magnetic shielding plate 9 itself forms a closed magnetic circuit, the magnetic fields generated by the two coils are confined to the vicinity of their respective contact assemblies. This reduces magnetic field interference between the two magnetic coils, allowing the arc to be quickly introduced into the arc-extinguishing chamber 3 during the breaking process, thus improving the arc-extinguishing efficiency. At the same time, through the magnetic circuit guiding effect of the magnetic metal plate, the magnetic field can be efficiently utilized within a limited space, ensuring that the compactness of the double-break structure is not affected.

[0070] Further, please continue to refer to Figure 3 and Figure 6 As shown, in some embodiments, an electrical connection channel 10 connects the first magnetic coil 6 and the second magnetic coil 7. The electrical connection channel 10 has a U-shaped groove structure. The magnetic shielding plate 9 is snapped into the U-shaped groove. The bottom of the U-shaped groove protrudes from the outer surface of the first magnetic coil 6, so that the projection of the magnetic shielding plate 9 on the first magnetic coil 6 completely covers the first magnetic coil 6. The bottom of the U-shaped groove protrudes from the outer surface of the second magnetic coil 7, so that the projection of the magnetic shielding plate 9 on the second magnetic coil 7 completely covers the second magnetic coil 7.

[0071] Among them, the electrical connection channel 10 refers to the conductive structure that connects the two magnetic coils. Specifically, it can be made of a U-shaped groove structure using a metal material with good conductivity, which is used to realize the conduction of the current loop between the first magnetic coil and the second magnetic coil.

[0072] Among them, the U-shaped groove structure refers to a groove shape with a bottom plane and two side walls. Specifically, it can be processed by stamping. The height of its two side walls is greater than the diameter of the magnetic coil to ensure that the magnetic field is confined within the groove.

[0073] The magnetic shielding plate 9 being snapped into the U-shaped groove means that the magnetic shielding plate 9 is embedded in the concave cavity of the U-shaped groove, which can form a physical isolation layer to block the lateral diffusion of the magnetic field.

[0074] The phrase "the bottom of the groove protrudes from the outer surface of the magnetic coil" means that the bottom plane of the U-shaped groove extends outward from the coil, specifically extending by 10%-30% of the coil diameter, so that the magnetic shielding plate 9 completely covers the outer contour of the coil in the vertical direction.

[0075] Specifically, the bottom plane of the U-shaped groove structure and the two side walls form a closed magnetic conduction path, confining the magnetic fields generated by the first magnetic coil 6 and the second magnetic coil 7 within their respective grooves. After the magnetic shielding plate 9 is embedded in the U-shaped groove, its two side edges are in close contact with the groove walls, blocking the leakage of the magnetic field in the horizontal direction. The protruding part extending outward from the bottom of the U-shaped groove allows the magnetic shielding plate 9 to completely cover the outer surface of the magnetic coil in the vertical projection direction, forming a three-dimensional shielding structure. When the two magnetic coils are energized and generate opposite magnetic fields, the magnetic field is confined within the U-shaped groove and conducts along a predetermined direction, avoiding mutual interference between adjacent magnetic fields. At the same time, the covering design of the magnetic shielding plate 9 effectively eliminates the cross-influence of edge magnetic fields.

[0076] Through the above technical solution, this solution achieves omnidirectional shielding of the magnetic field within the same installation space using a combination structure of a U-shaped groove and a magnetic shielding plate 9. Simultaneously, the protruding design at the bottom of the groove enhances the vertical coverage and sealing, preventing localized magnetic field leakage due to assembly errors. This allows for strict confinement of the interaction area of ​​two opposing magnetic fields within a predetermined range within the limited space of a double-break circuit breaker, eliminating magnetic field cancellation and ensuring that the arc rapidly enters the arc-extinguishing chamber 3 along a set trajectory under the action of magnetic blowing force, thus improving arc-extinguishing efficiency.

[0077] Furthermore, such as Figure 4 and Figure 5 As shown, in some embodiments, the first contact assembly 1 and the second contact assembly 2 each include a stationary contact 02. A first angle c exists between the second segment 42 and the end of the stationary contact 02 of the first contact assembly 1. The first angle c is greater than or equal to 90°. Furthermore, the first angle c is less than or equal to 120°. A second angle d exists between the fifth segment 52 and the end of the stationary contact 02 of the second contact assembly 2. The second angle d is greater than or equal to 90°. Furthermore, the second angle d is less than or equal to 120°.

[0078] Wherein, the first angle c refers to the angle between the second section 42 of the first arc-initiating plate 4 and the end of the stationary contact 02 of the first contact assembly 1. This angle range can optimize the force direction of the arc when it leaves the moving contact 01. Specifically, one end of the stationary contact 02 is used to connect to the terminal block to realize the flow of current loop in the circuit breaker, and the other end of the stationary contact 02 is close to the arc-extinguishing chamber 3 to introduce the arc into the arc-extinguishing chamber. In this application, the end of the stationary contact 02 refers to the other end of the stationary contact 02 that is close to the arc-extinguishing chamber.

[0079] The second angle d refers to the angle between the fifth segment 52 of the second arc-inducing plate 5 and the end of the stationary contact 02 of the second contact assembly 2. Specifically, it can be achieved by adopting an angle structure that is symmetrical to the first angle c. This design ensures the symmetry of the arc transfer path on both sides of the double break.

[0080] Specifically, during the arc transfer process, the angle structure formed between the second segment 42 of the first arc-initiating plate 4 and the end of the stationary contact 02 can change the magnetic field distribution, so that the arc is subjected to a magnetic force component perpendicular to the contact separation direction when it separates from the moving contact 01. When the first angle c is set to not less than 90°, the arc between the arc-initiating plate and the end of the stationary contact 02 is stretched sufficiently, increasing the cooling area of ​​the arc and enabling the arc to cool down and extinguish rapidly. When the first angle c is set to not more than 120°, the maximum stroke of the arc to reach the arc-extinguishing chamber 3 allows the arc between the arc-initiating plate and the stationary contact 02 to smoothly reach the arc-extinguishing chamber 3 under the drive of the magnetic field, so that the arc is extinguished smoothly. The second angle d between the fifth segment 52 of the second arc-initiating plate 5 and the end of the stationary contact 02 of the second contact assembly 2 adopts the same angle range, so that the arcs on both sides remain synchronized during the transfer process, avoiding current follow-through due to arc retention on one side.

[0081] Through the above technical solution, this application solves the problems of insufficient arc transfer speed and inability to extinguish smoothly caused by unreasonable angle between the first arc-initiating plate 4 / second arc-initiating plate 5 and stationary contact 02. By optimizing the angle parameters, the arc is directly driven into the arc-extinguishing chamber 3 after leaving the contact, which improves the path stability of the arc entering the arc-extinguishing grid plate 31, thereby improving the arc-extinguishing efficiency of the double-break circuit breaker.

[0082] like Figure 4 and Figure 5 As shown, in some embodiments, the arc-extinguishing chamber 3 includes a plurality of arc-extinguishing grid plates 31 stacked along the second direction Y, with an arc-extinguishing gap between adjacent arc-extinguishing grid plates 31. A third segment 43 is parallel to the arc-extinguishing grid plates 31, and an arc-extinguishing gap exists between the third segment 43 and the bottom of the arc-extinguishing chamber 3. A sixth segment 53 is parallel to the arc-extinguishing grid plates 31, and an arc-extinguishing gap exists between the sixth segment 53 and the bottom of the arc-extinguishing chamber 3.

[0083] Among them, the arc-extinguishing grid 31 refers to the thin metal sheet used to divide the electric arc, which can be made of copper alloy material by stamping, and its layered arrangement forms a multi-level arc dividing channel. The arc-extinguishing gap refers to the interval between adjacent arc-extinguishing grids 31, which can be achieved by adjusting the installation spacing of the arc-extinguishing grids 31. This gap allows the electric arc to diffuse step by step and reduces the energy density. The arc-extinguishing gap between the third section 43 and the bottom of the arc-extinguishing chamber 3 refers to the interval area between the end of the arc plate and the bottom of the arc-extinguishing chamber 3. This gap can prevent the electric arc from forming a short circuit path at the bottom of the arc-extinguishing chamber 3. The arc-extinguishing gap between the sixth section 53 and the bottom of the arc-extinguishing chamber 3 is set with the same principle to ensure that the arc guiding path on both sides of the double break point is symmetrical.

[0084] When an electric arc is generated upon contact separation, the layered structure formed by the vertically stacked arc-extinguishing grid plates 31 cuts through the arc. The gaps between adjacent arc-extinguishing grid plates 31 form a stepped arc diffusion channel, forcing the arc to be divided into multiple short arc segments. The arrangement of the third segment 43 and the sixth segment 53 parallel to the arc-extinguishing grid plates 31 ensures that the end of the arc-initiating plate maintains a predetermined distance from the bottom of the arc-extinguishing chamber 3.

[0085] Through the above technical solution, this solution forms a multi-level segmentation channel by directional stacking of arc-extinguishing grid plates 31. Combined with the optimized design of the end gap of the arc-initiating plate, a continuous arc guiding and segmentation path is constructed, achieving rapid arc introduction and efficient segmentation within the arc-extinguishing chamber 3, effectively reducing the risk of arc energy accumulation within the arc-extinguishing chamber 3. The multi-layered arrangement of the arc-extinguishing grid plates 31 improves the arc segmentation efficiency. The third segment 43 and the sixth segment 53 are both parallel to the arc-extinguishing grid plates 31, and both have arc-extinguishing gaps between them and the bottom of the arc-extinguishing chamber 3. This allows the third segment 43 and the sixth segment 53 to function as arc-extinguishing grid plates 31, enabling the first arc-initiating plate 4 and the second arc-initiating plate 5 to be reused. Furthermore, it increases the number of arc-extinguishing grid plates 31 within the arc-extinguishing chamber 3, thereby improving the arc-extinguishing speed and reliability of the double-break circuit breaker.

[0086] like Figure 4 and Figure 5 As shown, in some embodiments, the first segment 41 extends along the second direction Y, and the projection of the first segment 41 on the moving contact 01 of the first contact assembly 1 completely covers the end of the moving contact 01 of the first contact assembly 1. The fourth segment 51 extends along the second direction Y, and the projection of the fourth segment 51 on the moving contact 01 of the second contact assembly 2 completely covers the end of the moving contact 01 of the second contact assembly 2.

[0087] like Figure 1 and Figure 2 As shown, the second direction Y refers to the vertical direction perpendicular to the arrangement direction of the contact assembly, which is consistent with the stacking direction of the arc-extinguishing grid 31 in the arc-extinguishing chamber 3.

[0088] Among them, complete projection coverage means that the projection area of ​​the arc-initiating plate section at the breaking position of the moving contact 01 completely wraps the edge of the contact end. Specifically, this can be achieved by adjusting the length and tilt angle of the arc-initiating plate section, so that the arc directly contacts the surface of the arc-initiating plate when the contact separates.

[0089] Specifically, when the moving contact 01 separates from the stationary contact 02 and generates an arc, the first segment 41 and the fourth segment 51, extending along the second direction Y, respectively cover the entire area of ​​the ends of the two moving contacts 01. At the moment of contact separation, the arc is captured by the magnetic field formed on the surface of the arc-initiating plate and moves towards the bottom of the arc-extinguishing chamber 3 along the surfaces of the first arc-initiating plate 4 and the second arc-initiating plate 5. Because the projected coverage area completely envelops the ends of the moving contacts, the arc cannot linger at the contact gap but is forcibly elongated and quickly enters the gap between the arc-extinguishing grid plates 31. During this process, the root of the arc remains in contact with the arc-initiating plate, avoiding arc escape caused by uneven magnetic field distribution.

[0090] In some specific embodiments, the first section 41 and the fourth section 51 can adopt an L-shaped bending structure, with the vertical section extending along the second direction Y and parallel to the end of the moving contact 01, and the horizontal section bending towards the bottom of the arc-extinguishing chamber 3 to form a guiding surface. The surface of the arc-starting plate can be provided with a metal coating resistant to arc erosion, such as a silver-nickel alloy, to enhance the stability of arc transfer.

[0091] Through the above technical solution, this solution optimizes the spatial layout so that the arc-starting plate forms a complete arc transfer path at the moment the contacts break, eliminating the arc dwell time at the contact end and realizing the rapid transfer of the arc from the contact separation point to the arc-extinguishing chamber 3. This solves the problem of aggravated contact erosion caused by arc dwell and reduces the probability of arc reignition, significantly improving the breaking reliability of the double-break circuit breaker.

[0092] Secondly, this application provides a dual-break circuit breaker, including the arc extinguishing system described in any of the above embodiments.

[0093] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0094] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An arc-extinguishing system applied to a double-break circuit breaker, characterized in that, include: First contact assembly, second contact assembly, arc extinguishing chamber, first arc-starting plate and second arc-starting plate; The first contact assembly and the second contact assembly are arranged parallel to each other in the double-break circuit breaker along a first direction; The arc-extinguishing chamber is disposed between the first contact assembly and the second contact assembly, and the arc-extinguishing chamber includes a top and a bottom opposite each other in a second direction; Wherein, the second direction is perpendicular to the first direction; One end of the first arc-starting plate is located at the bottom of the arc-extinguishing chamber; The other end of the first arc-inducing plate is close to the first contact assembly; One end of the second arc-starting plate is located at the bottom of the arc-extinguishing chamber; The other end of the second arc-starting plate is close to the second contact assembly; A first magnetic coil is provided on the side of the first arc-inducing plate away from the first contact assembly; A second magnetic coil is provided on the side of the second arc-inducing plate away from the second contact assembly; The first magnetic coil is electrically connected to the second magnetic coil, and the first magnetic coil and the second magnetic coil have opposite rotation directions.

2. The arc-extinguishing system according to claim 1, characterized in that, The first contact assembly and the second contact assembly each include a moving contact; The first arc-starting plate includes a first segment, a second segment, and a third segment; The first segment is close to the moving contact of the first contact assembly; One end of the second segment is connected to the first segment; The third section is located at the bottom of the arc-extinguishing chamber, and the third section is connected to the other end of the second section; The first magnetic coil is disposed on the second section; The second arc-starting plate includes a fourth section, a fifth section, and a sixth section; The fourth section is located near the moving contact of the second contact assembly; One end of the fifth segment is connected to the fourth segment; The sixth section is located at the bottom of the arc-extinguishing chamber, and the sixth section is connected to the other end of the fifth section; The second magnetic coil is disposed on the fifth section.

3. The arc-extinguishing system according to claim 2, characterized in that, A magnetizing block is inserted into the first magnetic coil and / or the second magnetic coil.

4. The arc-extinguishing system according to claim 3, characterized in that, The magnetizing block is a cylinder.

5. The arc-extinguishing system according to claim 2, characterized in that, A magnetic shielding plate is provided between the first magnetic coil and the second magnetic coil; The magnetic shielding plate is a metal plate with magnetic properties.

6. The arc-extinguishing system according to claim 5, characterized in that, An electrical connection channel is provided between the first magnetic coil and the second magnetic coil; The electrical connection channel has a U-shaped groove structure; The magnetic shielding plate is snapped into the U-shaped groove; The bottom of the U-shaped groove protrudes from the outer surface of the first magnetic coil, so that the projection of the magnetic shielding plate on the first magnetic coil completely covers the first magnetic coil; The bottom of the U-shaped groove protrudes beyond the outer surface of the second magnetic coil, so that the projection of the magnetic shielding plate on the second magnetic coil completely covers the second magnetic coil.

7. The arc-extinguishing system according to any one of claims 2-6, characterized in that, The first contact assembly and the second contact assembly each include a stationary contact; There is a first angle between the second segment and the stationary contact end of the first contact assembly; The first angle is greater than or equal to 90°; and, The first angle is less than or equal to 120°; There is a second angle between the fifth segment and the stationary contact end of the second contact assembly; The second angle is greater than or equal to 90°; and, The second angle is less than or equal to 120°.

8. The arc-extinguishing system according to any one of claims 2-6, characterized in that, The arc-extinguishing chamber includes a plurality of arc-extinguishing grid plates stacked along the second direction, and there is an arc-extinguishing gap between two adjacent arc-extinguishing grid plates; The third section is parallel to the arc-extinguishing grid plate, and the arc-extinguishing gap exists between the third section and the bottom of the arc-extinguishing chamber; The sixth section is parallel to the arc-extinguishing grid plate, and the arc-extinguishing gap exists between the sixth section and the bottom of the arc-extinguishing chamber.

9. The arc-extinguishing system according to any one of claims 2-6, characterized in that, The first segment extends along the second direction, and the projection of the first segment on the moving contact of the first contact assembly completely covers the end of the moving contact of the first contact assembly. The fourth segment extends along the second direction, and the projection of the fourth segment onto the moving contact of the second contact assembly completely covers the end of the moving contact of the second contact assembly.

10. A double-break circuit breaker, characterized in that, The arc extinguishing system includes any one of claims 1-9.

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