Circuit breaker and breaking device thereof

Abstract

The embodiment of the utility model provides a circuit breaker and a breaking device thereof. The breaking device comprises: a housing; the first static contact comprises a first static contact point; the moving contact assembly comprises a moving contact support and a first moving contact, the moving contact support is rotatably connected with the shell, and the first moving contact can abut against or be separated from the first static contact; the first arc extinguishing gate is arranged in the first arc extinguishing chamber; the first magnetism increasing assembly comprises a first magnetism increasing plate and a second magnetism increasing plate which are located on the two sides of the rotating path of the first movable contact; the magnetic blow-out assembly is located outside the first arc extinguishing chamber and comprises at least one magnet, and the at least one magnet, the first magnetism increasing plate and the second magnetism increasing plate are matched; therefore, the magnetic field between the first magnetism increasing plate and the second magnetism increasing plate can guide the electric arc generated by the first static contact and the first movable contact towards the first arc extinguish chamber.

Description

TECHNICAL FIELD

[0001] Embodiments of the present disclosure relate to a circuit breaker and a breaking device thereof. BACKGROUND

[0002] A circuit breaker plays an electrical protection role in an electric circuit. The circuit breaker includes a static contact and a movable contact capable of abutting and separating from the static contact. When the circuit breaker breaks the current, the movable contact leaves the static contact, and the air medium between the movable contact and the static contact discharges under the action of voltage, thereby generating an arc. The arc is extinguished by an arc-extinguishing chamber provided with an arc-extinguishing grid.

[0003] In the current circuit breaker, the arc-extinguishing grid is usually relatively close to the breaking point of the movable contact and the static contact, and the arc can easily enter the arc-extinguishing chamber and be extinguished by the arc-extinguishing grid. However, for the case where the arc-extinguishing grid is far away from the breaking point of the movable contact and the static contact, how to guide the arc (especially the small-current arc) to move in the direction of the arc-extinguishing grid is a problem to be solved. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the present disclosure is to provide a circuit breaker and a breaking device thereof to at least partially solve the above problems.

[0005] In a first aspect of the present disclosure, a breaking device for a circuit breaker is provided, comprising: a housing; a first static contact head provided on the housing and comprising a first static contact point, the first static contact point being provided on a first end of the first static contact head, a second end of the first static contact head being used to connect with one of a power supply and a load; a movable contact assembly provided in the housing and comprising a movable contact support and a first movable contact point provided on the movable contact support, the movable contact support being rotationally connected with the housing, the first movable contact point being capable of rotating with the movable contact support to abut or separate from the first static contact point; a first arc-extinguishing grid provided in a first arc-extinguishing chamber in the housing; a first magnetic enhancement assembly provided in the housing and comprising a first magnetic enhancement plate and a second magnetic enhancement plate located on both sides of a rotation path of the first movable contact point; and a magnetic blow assembly provided in the housing and located outside the first arc-extinguishing chamber, the magnetic blow assembly comprising at least one magnet, wherein the at least one magnet, the first magnetic enhancement plate and the second magnetic enhancement plate cooperate to enable the magnetic field between the first magnetic enhancement plate and the second magnetic enhancement plate to guide the arc generated by the first static contact point and the first movable contact point towards the first arc-extinguishing chamber.

[0006] In some embodiments, the magnetic blow assembly further comprises at least one first magnetic conductor, the at least one first magnetic conductor being stacked together with the at least one magnet, one of the N-pole and the S-pole of the magnet being close to the first magnetic enhancement assembly, and the other of the N-pole and the S-pole of the magnet being close to the first arc-extinguishing grid.

[0007] In some embodiments, the at least one magnet comprises a first magnet and a second magnet arranged at intervals, and a plurality of the first flux guides are arranged between the first magnet and the second magnet.

[0008] In some embodiments, a first arc striking piece is arranged in the first arc extinguishing chamber, the first arc striking piece extending from the first end of the first stationary contact to one end of the first arc extinguishing grid, and the magnet and the first flux guide are arranged along the extension direction of the first arc striking piece.

[0009] In some embodiments, the first magnet enhancement assembly comprises a second flux guide, the first magnet enhancement plate and the second magnet enhancement plate extending from the same side of the second flux guide to form a first recess, and the first end of the first stationary contact is clamped in the first recess.

[0010] In some embodiments, the magnetic blow assembly is connected with the second flux guide.

[0011] In some embodiments, a first partition comprising a gas generating material is arranged in the first arc extinguishing chamber, and the shell is provided with a first gas outlet channel communicating with the first arc extinguishing chamber.

[0012] In some embodiments, the movable contact assembly further comprises a second movable contact point arranged on the movable contact support, and the breaking device further comprises: a second stationary contact arranged on the shell and comprising a second stationary contact point arranged on the first end of the second stationary contact to cooperate with the second movable contact point, and a second end of the second stationary contact being used to connect with the other one of the power supply and the load; a second arc extinguishing grid arranged in a second arc extinguishing chamber in the shell; and a second magnet enhancement assembly arranged in the shell and comprising a third magnet enhancement plate and a fourth magnet enhancement plate located on both sides of the rotation path of the second movable contact point.

[0013] In some embodiments, the second magnet enhancement assembly comprises a third flux guide, the third magnet enhancement plate and the fourth magnet enhancement plate extending from the same side of the third flux guide to form a second recess, and the first end of the second stationary contact is clamped in the second recess.

[0014] In some embodiments, the distance between the first arc extinguishing grid and the rotation center of the movable contact support is greater than the distance between the second arc extinguishing grid and the rotation center of the movable contact support.

[0015] In some embodiments, a second partition comprising a gas generating material is arranged in the second arc extinguishing chamber, and the shell is provided with a second gas outlet channel communicating with the second arc extinguishing chamber.

[0016] In a second aspect of the present disclosure, a circuit breaker is provided, comprising the breaking device for circuit breaker according to the first aspect of the present disclosure.

[0017] The breaking device provided by the embodiments of the present disclosure generates a magnetic field by the magnet of the magnetic blow assembly, and guides the magnetic field by the first magnetic enhancement plate and the second magnetic enhancement plate, so that the magnetic field generates a magnetic blow force on the arc generated at the moment of breaking of the first moving contact and the first stationary contact, to guide the arc into the first arc extinguishing chamber. In this way, even a small current arc can be introduced into the first arc extinguishing chamber to be extinguished, so that the breaking device can break both large current (short circuit current) and small current (critical load current) at a higher voltage.

[0018] It should be understood that the content described in this part is not intended to limit the key features or important features of the embodiments of the present disclosure, nor is it used to limit the scope of the present disclosure. Other features of the present disclosure will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and other features, advantages, and aspects of embodiments of the present disclosure will become more apparent by describing in detail preferred embodiments thereof with reference to the attached drawings in which:

[0020] Figure 1 An internal structure schematic diagram of the breaking device for circuit breaker according to the embodiments of the present disclosure is shown;

[0021] Figure 2 An internal structure schematic diagram of the breaking device for circuit breaker according to the embodiments of the present disclosure is shown; Figure 1 A perspective view of the breaking device is shown, in which the first partition plate and the second partition plate are omitted;

[0022] Figure 3 A perspective view of the breaking device is shown, in which the first partition plate and the second partition plate are omitted; Figure 4 A perspective view of the breaking device is shown, in which the first partition plate and the second partition plate are omitted; Figure 2 A perspective view of the breaking device is shown, in which the first partition plate and the second partition plate are omitted;

[0023] Figure 5 A perspective view of the breaking device is shown, in which the first partition plate and the second partition plate are omitted; Figure 3 The arc when the first moving contact and the first stationary contact of the breaking device are separated, and the partial magnetic induction lines of the magnetic blow assembly are shown. DETAILED DESCRIPTION

[0024] Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

[0025] As used herein, the term "including" and its variations represent open inclusion, i.e., "including but not limited to." Unless otherwise stated, the term "or" means "and / or." The term "based on" means "based at least in part on." The terms "one example embodiment" and "an embodiment" mean "at least one example embodiment." The term "another embodiment" means "at least one additional embodiment." The terms "first," "second," etc. may refer to different or identical objects.

[0026] As described above, when the arc extinguishing grid is far away from the breaking point of the moving and static contacts, the arc extinguishing capability of the circuit breaker still needs to be improved. The embodiment of the present disclosure provides a circuit breaker and a breaking device 100 thereof, which can improve the arc extinguishing performance when the breaking point of the moving and static contacts is far away from the arc extinguishing grid. Figures 1 to 5 The principles of the present disclosure are described.

[0027] Figure 1 A schematic diagram of the internal structure of a disconnecting device for a circuit breaker according to an embodiment of the present disclosure is shown. Figure 2 Shown Figure 1 The disconnecting device is shown in a perspective view without the housing. Figure 3 and Figure 4 Shown Figure 2 The dividing device shown is a perspective view from different perspectives with the first partition plate and the second partition plate omitted. Figure 5 Shown Figure 3 The diagram shows an arc when the first moving contact and the first static contact of the breaking device are separated, and also shows part of the magnetic flux lines of the magnetic blow assembly.

[0028] See also Figures 1 to 4 , shows a schematic structural diagram of a disconnecting device 100 for a circuit breaker, wherein the disconnecting device 100 is in an opening state.

[0029] Specifically, the disconnect device 100 includes a housing 10, on which are disposed a first static contact 21 and a second static contact 22. A first end 211 of the first static contact 21 extends into the housing 10, while a second end 212 of the first static contact 21 is located outside the housing 10. The first static contact 21 includes a first static contact point 31, which is disposed at the first end 211 of the first static contact 21. A first end 221 of the second static contact 22 extends into the housing 10, while a second end 222 of the second static contact 22 is located outside the housing 10. The second static contact 22 includes a second static contact point 32, which is disposed at the first end 221 of the second static contact 22. In this embodiment, one of the second end 212 of the first static contact 21 and the second end 222 of the second static contact 22 is configured to connect to a power source, while the other is configured to connect to a load.

[0030] The housing 10 is provided with a moving contact assembly 40, a first arc extinguishing grid 51, a second arc extinguishing grid 52, a first magnetic enhancement assembly 61, a second magnetic enhancement assembly 62, and a magnetic blowout assembly 70.

[0031] The moving contact assembly 40 includes a moving contact support 43, a first moving contact 41, and a second moving contact 42. The middle part of the moving contact support 43 is rotationally connected with the housing 10 to form a rotation center 45. The first moving contact 41 is arranged on the first end of the moving contact support 43, and the second moving contact 42 is arranged on the second end of the moving contact support 43. The first moving contact 41 and the second moving contact 42 can rotate with the moving contact support 43.

[0032] As described above, the first stationary contact 31 is arranged on the first end 211 of the first stationary contact 21, and the second stationary contact 32 is arranged on the first end 221 of the second stationary contact 22. With the rotation of the moving contact support 43, the first moving contact 41 can abut or separate from the first stationary contact 31, and the second moving contact 42 can abut or separate from the second stationary contact 32, thereby corresponding to the closing state and the opening state of the disconnecting device 100.

[0033] The first arc extinguishing grid 51 is located in the first arc extinguishing chamber la in the housing 10. When the first moving contact 41 separates from the first stationary contact 31, the arc generated therebetween can be introduced into the first arc extinguishing chamber la, and the first arc extinguishing grid 51 is used to extinguish the arc. The second arc extinguishing grid 52 is located in the second arc extinguishing chamber lb in the housing 10. When the second moving contact 42 separates from the second stationary contact 32, the arc generated therebetween can be introduced into the second arc extinguishing chamber lb, and the second arc extinguishing grid 52 is used to extinguish the arc. In some embodiments, the structures of the first arc extinguishing chamber la and the second arc extinguishing chamber lb are symmetrical. In some embodiments, the structure of the housing 10 is limited by the constraints of other related components, and the structures of the first arc extinguishing chamber la and the second arc extinguishing chamber lb can be asymmetrical.

[0034] Referring to Figure 1 In the present embodiment, the structures of the first arc extinguishing chamber la and the second arc extinguishing chamber lb are asymmetrical, and the distance from the first arc extinguishing grid 51 to the rotation center 45 is greater than the distance from the second arc extinguishing grid 52 to the rotation center 45. The space of the first arc extinguishing chamber la is greater than that of the second arc extinguishing chamber lb, and more arc extinguishing grids 51 can be arranged in the first arc extinguishing chamber la. In some embodiments, the first arc extinguishing grid 51 extends, for example, along a straight line, and the second arc extinguishing grid 52 extends, for example, along an arc. The extension mode of each arc extinguishing grid matches the structure of the arc extinguishing chamber in which it is located.

[0035] In some embodiments, the first arc-extinguishing chamber 1a is provided with a first arc striking piece 81 and a second arc striking piece 82. The first arc striking piece 81 extends from the first end 211 of the first stationary contact 21 to one end of the first arc-extinguishing grid 51. The second arc striking piece 82 extends from the other end of the first arc-extinguishing grid 52 to the maximum opening position of the first movable contact 41. The first arc striking piece 81 and the second arc striking piece 82 facilitate the arc to enter the first arc-extinguishing chamber 1a as soon as possible, so as to accelerate arc extinguishing.

[0036] In some embodiments, the second arc striking piece 82 is bent near one end of the first movable contact 41, so as to facilitate the arc to transfer from the first movable contact 41 to the second arc striking piece 82. In some embodiments, a groove structure is formed on the second arc striking piece 82, and the groove structure extends along the extension direction of the second arc striking piece 82, so as to facilitate the arc to move towards the first arc-extinguishing grid 51.

[0037] In some embodiments, the first end 221 of the second stationary contact 22 is close to one end of the second arc-extinguishing grid 52, and the first end 221 of the second stationary contact 22 plays an arc striking role. A third arc striking piece 83 is arranged in the second arc-extinguishing chamber 1b, and the third arc striking piece 83 extends from the other end of the second arc-extinguishing grid 52 to the maximum opening position of the second movable contact 42. In some embodiments, the third arc striking piece 83 is bent near one end of the second movable contact 42, so as to facilitate the arc to transfer from the second movable contact 42 to the third arc striking piece 83. A groove structure can be formed on the third arc striking piece 83, and the groove structure extends along the extension direction of the third arc striking piece 83, so as to facilitate the arc to move towards the second arc-extinguishing grid 52.

[0038] The first magnetic enhancement assembly 61 includes a first magnetic enhancement plate 611 and a second magnetic enhancement plate 612 located on both sides of the rotation path of the first movable contact 41. The first magnetic enhancement plate 611 and the second magnetic enhancement plate 612 are oppositely arranged in a direction parallel to the rotation center 45.

[0039] In some embodiments, the first magnetic enhancement plate 611 and the second magnetic enhancement plate 612 can be fixed on the first end 211 of the first stationary contact 21 and extend from the first stationary contact 21 to the opening direction of the first movable contact 41, respectively. The first stationary contact 31 is located between the first magnetic enhancement plate 611 and the second magnetic enhancement plate 612.

[0040] In some embodiments, the first magnetic enhancement assembly 61 can further include a second magnetic conductor 613, and the first magnetic enhancement plate 611 and the second magnetic enhancement plate 612 extend from the same side of the second magnetic conductor 613. The first magnetic enhancement plate 611, the second magnetic enhancement plate 612 and the second magnetic conductor 613 form a first recess.

[0041] The first end 211 of the first stationary contact 21 is clamped in the first recess.

[0042] The first magnetic enhancement plate 611, the second magnetic enhancement plate 612 and the second magnetic conductor 613 may, for example, be made of a magnetic conductive material, and more specifically, may be made of a ferromagnetic material.

[0043] The magnetic blowout assembly 70 is located outside the first arc-extinguishing chamber la and includes at least one magnet 71. Referring to Figure 1 and Figure 5 , the magnet 71 generates a magnetic field, the magnet 71 having an N pole and an S pole. One of the N pole and the S pole is close to the first magnetic enhancement assembly 61, and the other of the N pole and the S pole is close to the first arc-extinguishing grid 51. The magnet 71, the first magnetic enhancement plate 611 and the second magnetic enhancement plate 612 cooperate to enable the magnetic field between the first magnetic enhancement plate 611 and the second magnetic enhancement plate 612 to direct the arc generated by the first stationary contact 31 and the first movable contact 41 towards the first arc-extinguishing chamber la.

[0044] For ease of illustration, the magnetic lines of force M of the magnetic field generated by the magnet 71 are schematically shown in Figure 5 . Among them, under the influence of the first magnetic enhancement plate 611 and the second magnetic enhancement plate 612, the magnetic lines of force M located between the first magnetic enhancement plate 611 and the second magnetic enhancement plate 612 are deflected, forming the first magnetic lines of force M1 deflected towards the first magnetic enhancement plate 611 and the second magnetic lines of force M2 deflected towards the second magnetic enhancement plate 612.

[0045] The following will be described in combination with Figure 5 , for example, the second end 212 of the first stationary contact 21 is connected with the power supply, the second end 222 of the second stationary contact 22 is connected with the load, the N pole of the magnet 71 is close to the first arc-extinguishing grid 51, and the S pole of the magnet 71 is close to the first magnetic enhancement assembly 61, to describe the arc-extinguishing principle of the breaking device 100 of the embodiment of the disclosure.

[0046] At the moment when the first movable contact 41 and the first stationary contact 31 are separated, an arc A is generated between the first stationary contact 31 and the first movable contact 41. The current direction of the arc A is shown by the arrow, pointing from the first stationary contact 31 to the first movable contact 41. At this time, the arc A is first subjected to the Ampere force from the magnetic field at the magnetic line of force M3, so that the arc A is deflected in the direction indicated by the magnetic line of force M2, and then the arc A is subjected to the Ampere force deflected towards the first arc-extinguishing grid 51 under the action of the magnetic field at the magnetic line of force M2. That is, the arc A is subjected to the Ampere force (or magnetic blowout force) deflected towards the first arc-extinguishing chamber la, prompting the arc A to move into the first arc-extinguishing chamber la to be extinguished as soon as possible.

[0047] It can be understood that even if the positions of the N pole and the S pole of the magnet 71 are interchanged, and the connection relationship of the first stationary contact 21, the second stationary contact 22 and the power supply, the load is interchanged, the magnetic field between the first magnetic enhancement plate 611 and the second magnetic enhancement plate 612 still maintains the magnetic blowout force towards the first arc-extinguishing chamber la to the arc A to direct the arc A towards the first arc-extinguishing chamber la.

[0048] For example, in the case where the second end 212 of the first stationary contact 21 is connected with the load, the second end 222 of the second stationary contact 22 is connected with the power supply, the N pole of the magnet 71 is close to the first arc extinguishing grid 51, and the S pole is close to the first magnetic enhancement assembly 61, when the first moving contact 41 and the first stationary contact 31 are separated, the current direction of the generated arc A is from the first moving contact 41 to the first stationary contact 31. At this time, the arc A is first subjected to the Ampere force from the magnetic field at the magnetic induction line M3, so that the arc A is deflected in the direction indicated by the magnetic induction line M1, and then the arc A is subjected to the Ampere force deflected to the first arc extinguishing grid 51 under the action of the magnetic field at the magnetic induction line M1. That is, the arc A is subjected to the Ampere force (or magnetic blowing force) deflected to the first arc extinguishing chamber la, which promotes the arc A to move into the first arc extinguishing chamber la to be extinguished as soon as possible.

[0049] When breaking a large current (for example, a short-circuit current) at a high voltage, the large current arc generated between the moving contact and the stationary contact can quickly enter the respective arc extinguishing chambers to be extinguished by itself. However, when breaking a small current (for example, a critical load current, for example, about several amperes, tens of amperes), the small current arc generated between the moving contact and the stationary contact can not automatically enter the arc extinguishing chamber. If the breaking point position of the moving and stationary contacts is far away from the arc extinguishing grid, the small current arc is also not easy to contact the arc extinguishing grid to be extinguished, which can cause damage to the equipment and even cause safety problems. How to extinguish the small current arc at a high voltage is a problem in the art.

[0050] The breaking device 100 provided by the embodiments of the present disclosure generates a magnetic field by the magnet 71 of the magnetic blowing assembly 70, and guides the magnetic field by the first magnetic enhancement plate 611 and the second magnetic enhancement plate 612, so that the magnetic field generates a magnetic blowing force to the arc generated at the moment of separation of the first moving contact 41 and the first stationary contact 31, which guides the arc to enter the first arc extinguishing chamber la. In this way, even the small current arc can be introduced into the first arc extinguishing chamber la to be extinguished, so that the breaking device 100 can break both the large current (short-circuit current) and the small current (critical load current) at a high voltage.

[0051] Referring to Figures 1 to 3 In some embodiments, the second magnetic enhancement assembly 62 includes a third magnetic enhancement plate 621 and a fourth magnetic enhancement plate 622 located on opposite sides of the rotation path of the second moving contact 42. The third magnetic enhancement plate 621 and the fourth magnetic enhancement plate 622 are oppositely arranged in a direction parallel to the rotation center 45. The third magnetic enhancement plate 621 and the fourth magnetic enhancement plate 622 are beneficial to form a magnetic field, which is used to apply a force to the arc generated at the moment of separation of the second moving contact 42 and the second stationary contact 32 to move to the second arc extinguishing chamber lb, so as to guide the arc to the second arc extinguishing chamber lb and improve the speed of extinguishing the arc.

[0052] In some embodiments, the third and fourth magnet enhancing plates 621 and 622 can be fixed on the first end 221 of the second static contact 22 and extend from the second static contact 22 towards the second moving contact 42, respectively. The second static contact 32 is located between the third and fourth magnet enhancing plates 621 and 622.

[0053] In some embodiments, the second magnet enhancing assembly 62 can further include a third magnetic conductor 623, the third and fourth magnet enhancing plates 621 and 622 extending from the same side of the third magnetic conductor 623, and the third and fourth magnet enhancing plates 621, 622 and the third magnetic conductor 623 form a second recess in which the second static contact 22 is clamped.

[0054] The third and fourth magnet enhancing plates 621 and 622 and the third magnetic conductor 623 can be made of a magnetic conductive material, more specifically, a ferromagnetic material.

[0055] It should be noted that although the magnetic blowout assembly 70 as described above is not configured outside the second arc-extinguishing chamber lb in the present embodiment, in some alternative embodiments, the magnetic blowout assembly 70 as described above can also be configured outside the second arc-extinguishing chamber lb, which will not be described in detail here.

[0056] Referring to Figure 3 and Figure 4 In some embodiments, the magnetic blowout assembly 70 can further include at least one first magnetic conductor 72, and the magnets 71 and the first magnetic conductors 72 are stacked together. The magnets 71 and the first magnetic conductors 72 of the magnetic blowout assembly 70 can be arranged along the extension direction of the first arc guiding sheet 81. The magnetic blowout assembly 70 including the stacked magnets 71 and first magnetic conductors 72 has N and S poles, and the distance (i.e., pole distance) between the N and S poles of the magnetic blowout assembly 70 is far. In this way, the range of the magnetic field can be expanded, the decay of the magnetic induction intensity can be reduced, and the magnetic blowout force can be facilitated to push the arc to approach the first arc-extinguishing grid 51.

[0057] In some embodiments, the first magnetic conductors 72 can be made of a magnetic conductive material, more specifically, a ferromagnetic material.

[0058] Figure 1 An exemplary embodiment of the magnetic blowout assembly 70 is shown in FIG. 8. The magnets 71 can include a first magnet 711 and a second magnet 712 arranged at intervals. The first and second magnets 711 and 712 correspond to the two ends of the magnetic blowout assembly 70. A plurality of first magnetic conductors 72 can be stacked between the first and second magnets 711 and 712.

[0059] Of course, in some alternative embodiments, the magnetic blow assembly 70 may have other implementations. For example, the magnetic blow assembly 70 may include a single magnet 71 stacked between a plurality of first magnetic conductors 72. Alternatively, in some embodiments, two or more magnets 71 are stacked crosswise with two or more first magnetic conductors 72. Alternatively, in some embodiments, only the magnet 71 may be included without the first magnetic conductors 72.

[0060] In some embodiments, the magnetic blowing assembly 70 may be connected to the second magnetic conductor 613 of the first magnetizing assembly 61 to further reduce the attenuation of the magnetic induction intensity.

[0061] See also Figure 2 In some embodiments, a first partition 91 may be provided in the first arc-extinguishing chamber 1a, and the first partition 91 may contain a gas-generating material. The housing 10 may be provided with a first gas outlet channel 101, and the first gas outlet channel 101 may communicate with the first arc-extinguishing chamber 1a. In some embodiments, the first partition 91 may include two oppositely disposed plates, each plate being disposed on either side of the rotation path of the first movable contact 41 and extending to the first arc-extinguishing grid 51. When a high-current arc enters the first arc-extinguishing chamber 1a, the first partition 91 may generate a large amount of gas, which may be discharged from the first gas outlet channel 101, thereby facilitating the rapid movement and extinguishing of the arc within the first arc-extinguishing chamber 1a.

[0062] In some embodiments, a second baffle 92 containing a gas-generating material may be provided in the second arc-extinguishing chamber. The housing 10 is provided with a second gas outlet channel 102, which communicates with the second arc-extinguishing chamber 1b. In some embodiments, the second baffle 92 may include two opposing plates, each plate being positioned on either side of the rotational path of the second movable contact 42 and extending to the second arc-extinguishing grid 52. When a high-current arc enters the second arc-extinguishing chamber 1b, the second baffle 92 may generate a large amount of gas, which can be discharged from the second gas outlet channel 102, thereby facilitating the rapid movement and extinguishing of the arc within the second arc-extinguishing chamber 1b.

[0063] According to an embodiment of the present disclosure, a circuit breaker is further provided, which includes a disconnecting device 100 for a circuit breaker according to the above embodiment of the present disclosure. The circuit breaker to which the disconnecting device 100 is applied may be, but is not limited to, a DC circuit breaker.

[0064] The breaking device 100 provided by the embodiments of the present disclosure generates a magnetic field by the magnet 71 of the magnetic blow assembly 70, and guides the magnetic field by the first magnetic enhancement plate 611 and the second magnetic enhancement plate 612, so that the magnetic field generates a magnetic blow force on the electric arc generated at the moment of breaking of the first moving contact 41 and the first stationary contact 31, and guides the electric arc into the first arc-extinguishing chamber 1a. In this way, even a small-current electric arc can be introduced into the first arc-extinguishing chamber 1a to be extinguished, so that the breaking device 100 can break both large-current (short-circuit current) and small-current (critical load current) at a higher voltage. The circuit breaker applied with the breaking device 100 is particularly suitable for the field of photovoltaic and energy storage, etc. which requires high breaking voltage.

[0065] The above has described the embodiments of the present disclosure, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical application, or technical improvement in the market, or to enable other ordinary skilled in the art to understand the embodiments disclosed herein.

Claims

1. A breaking device for a circuit breaker, characterized in that: include: Housing (10); a first static contact (21) disposed on the housing (10) and comprising a first static contact point (31), wherein the first static contact point (31) is disposed on a first end (211) of the first static contact (21), and a second end (212) of the first static contact (21) is used to connect to one of a power source and a load; A moving contact assembly (40) is arranged in the housing (10) and comprises a moving contact bracket (43) and a first moving contact (41) arranged on the moving contact bracket (43); the moving contact bracket (43) is rotatably connected to the housing (10); the first moving contact (41) can rotate with the moving contact bracket (43) to abut against or separate from the first static contact (31); A first arc extinguishing grid (51) is arranged in a first arc extinguishing chamber (1a) in the housing (10); A first magnetizing assembly (61) is disposed in the housing (10) and comprises a first magnetizing plate (611) and a second magnetizing plate (612) located on both sides of a rotation path of the first movable contact (41); and A magnetic blow assembly (70) is arranged in the housing (10) and located outside the first arc extinguishing chamber (1a), wherein the magnetic blow assembly (70) includes at least one magnet (71), wherein the at least one magnet (71), the first magnetizing plate (611) and the second magnetizing plate (612) cooperate with each other so that the magnetic field between the first magnetizing plate (611) and the second magnetizing plate (612) can guide the arc generated by the first static contact (31) and the first movable contact (41) toward the first arc extinguishing chamber (1a).

2. The breaking device according to claim 1, characterized in that: The magnetic blowing assembly (70) further comprises at least one first magnetic conductor (72), the at least one first magnetic conductor (72) being stacked with the at least one magnet (71), one of the N pole and the S pole of the magnet (71) being close to the first magnetizing assembly (61), and the other of the N pole and the S pole being close to the first arc extinguishing grid (51).

3. The breaking device according to claim 2, characterized in that: The at least one magnet (71) includes a first magnet (711) and a second magnet (712) that are spaced apart, and a plurality of the first magnetic conductors (72) are stacked between the first magnet (711) and the second magnet (712).

4. The breaking device according to claim 2 or 3, characterized in that: A first arc-striking piece (81) is provided in the first arc-extinguishing chamber (1a), and the first arc-striking piece (81) extends from a first end of the first static contact (21) to one end of the first arc-extinguishing grid (51), and the magnet (71) and the first magnetic conductor (72) are arranged along the extension direction of the first arc-striking piece (81).

5. The breaking device according to claim 1, characterized in that: The first magnetizing component (61) includes a second magnetic conductor (613), the first magnetizing plate (611) and the second magnetizing plate (612) extend from the same side of the second magnetic conductor (613) to form a first recess, and the first end (211) of the first static contact (21) is stuck in the first recess.

6. The breaking device according to claim 5, characterized in that: The magnetic blowing assembly (70) is connected to the second magnetic conductor (613).

7. The breaking device according to claim 1, characterized in that A first partition (91) containing a gas-generating material is provided in the first arc-extinguishing chamber, and The housing (10) is provided with a first gas outlet channel (101), and the first gas outlet channel (101) is communicated with the first arc extinguishing chamber (1a).

8. The breaking device according to claim 1, characterized in that: The moving contact assembly (40) further includes a second moving contact (42) provided on the moving contact support (43), and The breaking device further comprises: a second static contact (22), arranged on the housing (10) and comprising a second static contact point (32), the second static contact point (32) being arranged on a first end (221) of the second static contact (22) to cooperate with the second movable contact point (42), the second end (222) of the second static contact (22) being used for connecting to the other of the power source and the load; A second arc extinguishing grid (52) is disposed in a second arc extinguishing chamber (1b) in the housing (10); and The second magnetizing assembly (62) is arranged in the housing (10) and comprises a third magnetizing plate (621) and a fourth magnetizing plate (622) located on both sides of the rotation path of the second movable contact (42).

9. The breaking device according to claim 8, characterized in that The second magnetizing component (62) includes a third magnetizer (623), the third magnetizing plate (621) and the fourth magnetizing plate (622) extend from the same side of the third magnetizer (623) to form a second recess, and the first end (221) of the second static contact (22) is stuck in the second recess.

10. The disconnecting device according to claim 8, characterized in that: The distance between the first arc extinguishing grid (51) and the rotation center of the moving contact bracket (43) is greater than the distance between the second arc extinguishing grid (52) and the rotation center of the moving contact bracket (43).

11. The disconnecting device according to claim 8, characterized in that: A second partition plate (92) containing a gas-generating material is provided in the second arc-extinguishing chamber (1b), and The housing (10) is provided with a second gas outlet channel (102), and the second gas outlet channel (102) is communicated with the second arc extinguishing chamber (1b).

12. A circuit breaker, characterized in that: The invention comprises a disconnecting device (100) according to any one of claims 1 to 11.

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