Arc extinguishing system and circuit breaker

Abstract

The invention discloses an arc extinguishing system and a circuit breaker, and the arc extinguishing system comprises an arc ignition assembly which is electrically connected with a contact assembly and comprises a first arc ignition sheet and a second arc ignition sheet; the first arc extinguish chamber is electrically connected with the contact assembly through a first arc striking sheet, the first arc extinguish chamber is arranged on one side of the contact assembly along the first direction, and the first arc extinguish chamber is communicated with the air outlet; the second arc extinguish chamber is electrically connected with the contact assembly through a second arc striking sheet, is arranged on one side of the first arc extinguish chamber along the second direction, and is communicated with the air outlet; and the arc striking channel is arranged between the first arc extinguish chamber and the second arc striking sheet along the third direction, is electrically connected with the contact assembly and the second arc extinguish chamber through the second arc striking sheet, and can lead the arc of the contact assembly into the second arc extinguish chamber. According to the arc extinguishing system and the circuit breaker, the capacity of the arc extinguishing chamber is increased in the limited space in the circuit breaker shell, the arc extinguishing effect is ensured, the overall size of the circuit breaker cannot be increased, and the transformation cost of the circuit breaker is reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of circuit breakers, and in particular, relates to an arc extinguishing system and a circuit breaker. Background Art

[0002] When a circuit breaker breaks a DC voltage, an arc will be generated. If the arc is not extinguished, the arc will form a flying arc that detaches from the circuit breaker. The existence of the flying arc will affect the circuit breaker and cause the circuit breaker and external lines and equipment to burn out. In order to avoid damage to the circuit breaker, the circuit breaker usually uses an arc extinguishing chamber to extinguish the arc. The arc extinguishing chamber is equipped with stacked arc extinguishing grids to divide the passing arc to achieve arc voltage division and cooling.

[0003] At present, in order to achieve complete arc extinguishing in small molded case circuit breakers, it is necessary to increase the space of the arc extinguishing chamber and the overall length of the arc extinguishing grid so that the arc extinguishing chamber can fully extinguish the arc, thereby completely extinguishing the arc. However, the increase in the space of the arc extinguishing chamber and the overall length of the arc extinguishing grid will increase the overall length of the circuit breaker, which will not only increase the overall volume of the circuit breaker, but also require the overall modification of the outer shell shape of the circuit breaker, increasing the overall manufacturing cost. Summary of the invention

[0004] The present application provides an arc extinguishing system and a circuit breaker, which increase the capacity of the arc extinguishing chamber within the limited space inside the circuit breaker housing, thereby ensuring the arc extinguishing effect, while not increasing the overall volume of the circuit breaker and reducing the modification cost of the circuit breaker.

[0005] The present application provides an arc extinguishing system, which is arranged between a contact assembly and an air outlet of a circuit breaker, and the arc extinguishing system includes: an arc striking assembly, which is electrically connected to the contact assembly, and the arc striking assembly includes a first arc striking piece and a second arc striking piece; a first arc extinguishing chamber, which is electrically connected to the contact assembly through the first arc striking piece, the first arc extinguishing chamber is arranged on one side of the contact assembly along a first direction, and the first arc extinguishing chamber is connected to the air outlet; a second arc extinguishing chamber, which is electrically connected to the contact assembly through the second arc striking piece, the second arc extinguishing chamber is arranged on one side of the first arc extinguishing chamber along a second direction, and the second arc extinguishing chamber is connected to the air outlet; an arc striking channel, which is arranged between the first arc extinguishing chamber and the second arc striking piece along a third direction, and the arc striking channel is electrically connected to both the contact assembly and the second arc extinguishing chamber through the second arc striking piece, and the arc striking channel can introduce the arc of the contact assembly into the second arc extinguishing chamber.

[0006] In the arc extinguishing system as above, the length of the first arc extinguishing chamber along the third direction is smaller than the length of the second arc extinguishing chamber along the third direction, and on the plane perpendicular to the second direction, the projections of the first arc extinguishing chamber and the arc striking channel both fall within the projection range of the second arc extinguishing chamber.

[0007] The arc extinguishing system as above further includes: an insulating isolation plate, a first arc extinguishing chamber and an arc striking channel arranged on one side of the insulating isolation plate along the second direction, a second arc extinguishing chamber arranged on the other side of the insulating isolation plate along the second direction, and a second arc striking plate arranged across the insulating isolation plate along the second direction.

[0008] The arc extinguishing system as above further includes: an exhaust channel, which is arranged on a side of the second arc extinguishing chamber away from the first arc extinguishing chamber along the second direction, and one end of the exhaust channel is connected to the second arc extinguishing chamber, and the other end is connected to the outlet.

[0009] As above arc extinguishing system, wherein the inlet of the first arc extinguishing chamber is arranged on the side of the arc extinguishing system close to the contact assembly and facing the contact assembly, the outlet of the first arc extinguishing chamber is arranged toward the air outlet, the inlet of the second arc extinguishing chamber is arranged on the side of the arc extinguishing system away from the contact assembly and facing away from the contact assembly, and the outlet of the second arc extinguishing chamber is arranged on the side of the arc extinguishing system close to the contact assembly and connected to the exhaust channel.

[0010] The arc extinguishing system as above, wherein the arc striking assembly also includes a third arc striking piece, the third arc striking piece includes a first connecting portion, a second connecting portion and a third connecting portion which are sequentially connected at a preset angle, the first connecting portion and the first arc striking piece are respectively arranged on both sides of the first arc extinguishing chamber along the third direction, the second connecting portion is arranged on the side of the second arc extinguishing chamber away from the contact assembly, and the third connecting portion and the second arc striking piece are respectively arranged on both sides of the second arc extinguishing chamber.

[0011] The arc extinguishing system as above, wherein the first arc extinguishing chamber includes a first grid assembly, a first anti-breakdown component and an extinguishing net, the first grid assembly includes a plurality of grids spaced apart along a third direction and a first arc inlet and a first row of arc outlets arranged on both sides of the grid assembly along a first direction, the first arc inlet is arranged at the entrance of the first arc extinguishing chamber, the first row of arc outlets is arranged at the exit of the first arc extinguishing chamber, the first anti-breakdown component and the extinguishing net are stacked along the first direction and covered on the first row of arc outlets.

[0012] As above arc extinguishing system, wherein the second arc extinguishing chamber includes a second grid assembly and a second anti-breakdown member, the second grid assembly includes a plurality of grids stacked along a third direction and a second arc inlet and a second row of arc outlets arranged on both sides of the second grid assembly along a first direction, the second arc inlet is arranged at the entrance of the second arc extinguishing chamber, the second row of arc outlets is arranged at the exit of the second arc extinguishing chamber, and the second anti-breakdown member cover is arranged on the second row of arc outlets.

[0013] The arc extinguishing system as above, wherein, further includes: a gas producing component, the gas producing component includes a first gas producing sheet and a second gas producing sheet, a gas producing channel is provided between the first gas producing sheet and the second gas producing sheet, the first end of the gas producing channel is arranged toward the contact assembly, and the second end is connected to the entrance of the first arc extinguishing chamber and the arc striking channel.

[0014] On the other hand, the present application also provides a circuit breaker, wherein the circuit breaker includes a contact assembly, a main air outlet, a shell and the above-mentioned arc extinguishing system, and the arc extinguishing system, the contact assembly and the air outlet are all arranged inside the shell.

[0015] The arc extinguishing system of the present application includes an arc striking assembly, a first arc striking chamber, a second arc striking chamber and an arc striking channel. The first arc striking chamber is electrically connected to the contact assembly through the first arc striking piece of the arc striking assembly, and the second arc striking chamber can be electrically connected to the contact assembly through the cooperation between the second arc striking piece of the arc striking assembly and the arc striking channel, so as to disperse the arc generated by the contact assembly and extinguish the arc separately, thereby ensuring the arc extinguishing effect. Since the first arc striking chamber and the second arc striking chamber are arranged along the second direction, the arc striking channel is arranged on one side of the first arc striking chamber along the third direction, and the arc striking channel and the second arc striking chamber are not arranged behind the first arc striking chamber along the first direction, there is no need to increase the overall length and volume of the circuit breaker in the first direction, and the space inside the circuit breaker in the second and third directions is reasonably utilized, thereby reducing the modification cost of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 A cross-sectional view of a circuit breaker according to an embodiment of the present application;

[0018] Figure 2 A schematic diagram of the structure of the arc extinguishing system of an embodiment of the present application;

[0019] Figure 3 An arc path diagram of an arc of a circuit breaker according to an embodiment of the present application passing through a first arc extinguishing chamber;

[0020] Figure 4 An arc path diagram of an arc of a circuit breaker according to an embodiment of the present application passing through a second arc extinguishing chamber;

[0021] Figure 5 An exploded view of a circuit breaker according to an embodiment of the present application;

[0022] Figure 6 A schematic diagram of the structure of a second arc extinguishing chamber of the arc extinguishing system of an embodiment of the present application;

[0023] Figure 7 A schematic diagram of the internal current path of the arc extinguishing system of an embodiment of the present application;

[0024] Figure 8 A schematic structural diagram of a third arc-starting piece of the arc-extinguishing system of an embodiment of the present application;

[0025] Fig. 9 This is a schematic diagram of the structure of the second arc-striking plate of the arc-extinguishing system of an embodiment of the present application.

[0026] Description of Figure Numbers:

[0027] 10. Arc extinguishing system; 20. Contact assembly; 30. Gas outlet; 40. Shell; 50. Gas generating assembly; 51. First gas generating sheet; 52. Second gas generating sheet; 53. Gas generating channel; 60. Arc striking assembly; 61. First arc striking sheet; 62. Second arc striking sheet; 63. Third arc striking sheet; 631. First connecting portion; 632. Second connecting portion; 633. Third connecting portion; 70. First arc extinguishing chamber; 71. First grid assembly; 711. First arc inlet; 712. First row of arc outlets; 72. First anti-breakdown component; 73. Disconnection elimination network; 80. Second arc extinguishing chamber; 811. Second arc inlet; 812. Second row of arc outlets; 81. Second grid assembly; 82. Second anti-breakdown component; 90. Arc striking channel; 100. Insulating isolation plate; 110. Exhaust channel;

[0028] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0029] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0030] like Figures 1 to 9As shown, an embodiment of the present application provides an arc extinguishing system, wherein the arc extinguishing system 10 is arranged between the contact assembly 20 and the gas outlet 30 of the circuit breaker, and includes: an arc striking assembly 60, which is electrically connected to the contact assembly 20, and the arc striking assembly 60 includes a first arc striking piece 61 and a second arc striking piece 62; a first arc extinguishing chamber 70, which is electrically connected to the contact assembly 20 through the first arc striking piece 61, and the first arc extinguishing chamber 70 is arranged on one side of the contact assembly 20 along the first direction X, and the first arc extinguishing chamber 70 is connected to the gas outlet 30; a second The arc extinguishing chamber 80 is electrically connected to the contact assembly 20 through the second arc-striking piece 62. The second arc extinguishing chamber 80 is arranged on one side of the first arc extinguishing chamber 70 along the second direction Y, and the second arc extinguishing chamber 80 is connected to the gas outlet 30. The arc striking channel 90 is arranged between the first arc extinguishing chamber 70 and the second arc-striking piece 62 along the third direction Z. The arc striking channel 90 is electrically connected to the contact assembly 20 and the second arc extinguishing chamber 80 through the second arc-striking piece 62. The arc striking channel 90 can introduce the arc of the contact assembly 20 into the second arc extinguishing chamber 80.

[0031] It should be noted that Figure 1 The circuit breaker shown in is a two-pole circuit breaker, and the embodiment of the present application is introduced based on the internal structure of one pole. Figure 1 In the embodiment, the vertical direction is the first direction X, the horizontal direction is the second direction Y, and the first direction X, the second direction Y and the third direction Z are arranged perpendicular to each other, wherein the specific direction of the third direction Z is as follows: Figure 2 shown.

[0032] In specific implementation, the arc extinguishing system of the present application includes an arc striking assembly 60, a first arc extinguishing chamber 70, a second arc extinguishing chamber 80 and an arc striking channel 90. The first arc extinguishing chamber 70 is electrically connected to the contact assembly 20 through the first arc striking piece 61 of the arc striking assembly 60. The second arc extinguishing chamber 80 can be electrically connected to the contact assembly 20 through the cooperation between the second arc striking piece 62 of the arc striking assembly 60 and the arc striking channel 90. The arc generated by the contact assembly 20 is divided into two parts. One part enters the first arc extinguishing chamber 70 for arc extinguishing under the guidance of the first arc striking piece 61, and the second part enters the second arc extinguishing chamber 80 through the arc striking channel 90 for arc extinguishing under the guidance of the second arc striking piece 62, thereby reducing the overall length of the arc, making it easier for the arc to enter the first arc extinguishing chamber 70 and the second arc extinguishing chamber 80, and the amount of arc entering the first arc extinguishing chamber 70 and the second arc extinguishing chamber 80 is a part of the arc generated by the contact assembly 20, thereby ensuring the arc extinguishing effect.

[0033] Since the first arc extinguishing chamber 70 and the second arc extinguishing chamber 80 are arranged along the second direction Y, the arc striking channel 90 is arranged on one side of the first arc extinguishing chamber 70 along the third direction Z, and the arc striking channel 90 and the second arc extinguishing chamber 80 are not arranged behind the first arc extinguishing chamber 70 along the first direction X, there is no need to increase the overall length and volume of the circuit breaker in the first direction X, the space inside the circuit breaker in the second direction Y and the third direction Z is reasonably utilized, and the modification cost of the circuit breaker is reduced.

[0034] In the arc extinguishing system of the embodiment of the present application, the length of the first arc extinguishing chamber 70 along the third direction Z is smaller than the length of the second arc extinguishing chamber 80 along the third direction Z, and on a plane perpendicular to the second direction Y, the projections of the first arc extinguishing chamber 70 and the arc striking channel 90 both fall within the projection range of the second arc extinguishing chamber 80.

[0035] In a specific implementation, by making the length of the first arc extinguishing chamber 70 smaller than the length of the second arc extinguishing chamber 80, the arc striking channel 90 and the first arc extinguishing chamber 70 can be both arranged on a side surface of the second arc extinguishing chamber 80 in the second direction Y, and do not exceed the range of the side surface of the second arc extinguishing chamber 80. In this way, there is no need to increase the space inside the circuit breaker for setting up the arc striking channel 90. While reasonably utilizing the internal space of the circuit breaker, the arc generated by the contact assembly 20 can be introduced into the second arc extinguishing chamber 80 arranged side by side with the first arc extinguishing chamber 70 along the second direction Y through the arc striking channel, thereby avoiding the arc spreading inside the circuit breaker during the arc striking process of the second arc striking piece 62.

[0036] like Figure 5 As shown, the arc extinguishing system of an embodiment of the present application further includes: an insulating isolation plate 100, a first arc extinguishing chamber 70 and an arc striking channel 90 are arranged on one side of the insulating isolation plate 100 along the second direction Y, a second arc extinguishing chamber 80 is arranged on the other side of the insulating isolation plate 100 along the second direction Y, and a second arc striking plate 62 is arranged along the second direction Y across the insulating isolation plate 100.

[0037] In a specific implementation, the insulating isolation plate 100 is arranged between the first arc extinguishing chamber 70 and the second arc extinguishing chamber 80, which can prevent the arc being extinguished in the first arc extinguishing chamber 70 from entering the second arc extinguishing chamber 80 along the second direction Y, causing a short circuit breakdown between the first arc extinguishing chamber 70 and the second arc extinguishing chamber 80.

[0038] Arranging the arc-striking channel 90 and the second arc-extinguishing chamber 80 on both sides of the insulating isolation plate 100 allows the arc to pass through the arc-striking channel 90 under the guidance of the second arc-striking plate 62 and reach the end of the second arc-extinguishing chamber 80, thereby preventing the arc from entering the middle of the second arc-extinguishing chamber 80 along the second direction Y during the passage of the arc-striking channel 90, causing the arc to fail to be completely extinguished and overflow outside the circuit breaker, affecting the safety of the circuit breaker.

[0039] like Figure 1As shown, the arc extinguishing system of an embodiment of the present application further includes: an exhaust channel 110, which is arranged on a side of the second arc extinguishing chamber 80 along the second direction Y away from the first arc extinguishing chamber 70, and one end of the exhaust channel 110 is connected to the second arc extinguishing chamber 80, and the other end is connected to the outlet 30.

[0040] During specific implementation, the gas generated after arc extinguishing in the second arc extinguishing chamber 80 can be discharged into the exhaust channel 110. Since the exhaust channel 110 has a certain length, the temperature of the high-temperature gas after arc extinguishing can be reduced. In addition, when the gas flows in the exhaust channel 110, the charged particles in the gas can be eliminated, thereby preventing the charged particles from being discharged from the circuit breaker and causing damage to the circuit breaker.

[0041] like Figure 1 As shown, the arc extinguishing system of an embodiment of the present application, wherein the inlet of the first arc extinguishing chamber 70 is arranged on the side of the arc extinguishing system 10 close to the contact assembly 20 and facing the contact assembly 20, the outlet of the first arc extinguishing chamber 70 is arranged toward the air outlet 30, the inlet of the second arc extinguishing chamber 80 is arranged on the side of the arc extinguishing system 10 away from the contact assembly 20 and facing away from the contact assembly 20, and the outlet of the second arc extinguishing chamber 80 is arranged on the side of the arc extinguishing system 10 close to the contact assembly 20 and connected to the exhaust channel 110.

[0042] In specific implementation, a part of the arc generated by the contact assembly 20 enters the entrance of the first arc extinguishing chamber 70 under the guidance of the first arc striking piece 61, passes through the first arc extinguishing chamber 70 along the first direction X to complete arc extinguishing, and the remaining gas is discharged from the outlet of the first arc extinguishing chamber 70 to the gas outlet 30, and then discharged to the outside of the circuit breaker; another part of the arc generated by the contact assembly 20 enters the arc striking channel 90 under the guidance of the second arc striking piece 62, and moves in the arc striking channel 90 along the first direction X until the second arc striking piece 62 guides the arc to the entrance of the second arc extinguishing chamber 80, and the arc moves downward in the second arc extinguishing chamber 80 along the first direction X to complete arc extinguishing, and the remaining gas is discharged from the outlet of the second arc extinguishing chamber 80 to the exhaust channel 110, and finally discharged from the circuit breaker through the gas outlet 30. Therefore, the positions of the entrances and exits of the first arc extinguishing chamber 70 and the second arc extinguishing chamber 80 are set so that both parts of the arc can be completely extinguished through the corresponding arc extinguishing chambers, thereby ensuring the arc extinguishing effect.

[0043] Figure 3 The arrow in FIG. 8 shows the arc path of the arc extinguishing in the second arc extinguishing chamber 80. The contact assembly 20 generates an arc, and the arc enters the first arc extinguishing chamber 70 from the entrance to the first arc extinguishing chamber 70 for arc extinguishing. After the arc is extinguished, the remaining gas is directly discharged from the outlet of the first arc extinguishing chamber 70 to the outlet 30, and finally discharged from the circuit breaker from the outlet 30.

[0044] Figure 4The arrow in the figure shows the arc path of the arc extinguishing in the second arc extinguishing chamber 80. The contact assembly 20 generates an arc. After the arc passes through the arc striking channel 90, the arc enters the second arc extinguishing chamber 80 from the entrance to the second arc extinguishing chamber 80 for arc extinguishing. After the arc is extinguished, the remaining gas is discharged from the outlet of the second arc extinguishing chamber 80 to the exhaust channel 110, and finally discharged from the circuit breaker from the outlet 30.

[0045] like Figure 8 As shown, the arc extinguishing system of an embodiment of the present application, wherein the arc striking assembly 60 also includes a third arc striking piece 63, the third arc striking piece 63 includes a first connection portion 631, a second connection portion 632 and a third connection portion 633 which are sequentially connected at a preset angle, the first connection portion 631 and the first arc striking piece 61 are respectively arranged on both sides of the first arc extinguishing chamber 70 along the third direction Z, the second connection portion 632 is arranged on the side of the second arc extinguishing chamber 80 away from the contact assembly 20, and the third connection portion 633 and the second arc striking piece 62 are respectively arranged on both sides of the second arc extinguishing chamber 80.

[0046] In specific implementation, the first connecting portion 631 and the first arc-striking piece 61 are respectively arranged on both sides of the first arc-extinguishing chamber 70 along the third direction Z, which can divide the arc generated by the contact assembly 20 into two separated parts. The two parts of the arc are far apart, which can avoid the two parts from contacting each other and recombining to form an overall arc. The first connecting portion 631 can guide a part of the arc into the arc-striking channel 90 and move it along the first direction X; the second connecting portion 632 connected to the first connecting portion 631 can guide the arc in the arc-striking channel 90 to the entrance of the second arc-extinguishing chamber 80. Since the third connecting portion 633 and the second arc-striking piece 62 are respectively arranged on both sides of the second arc-extinguishing chamber 80, the arc at the entrance of the second arc-extinguishing chamber 80 can be elongated and enter from the entrance of the second arc-extinguishing chamber 80. The elongated arc is easier to be cut by the second arc-extinguishing chamber 80, so the arc extinguishing effect is improved.

[0047] like Figure 2 As shown, an arc extinguishing system of an embodiment of the present application, wherein the first arc extinguishing chamber 70 includes a first grid assembly 71, a first anti-breakdown component 72 and an elution net 73, the first grid assembly 71 includes a plurality of grids spaced apart along a third direction Z and a first arc inlet 711 and a first row of arc outlets 712 disposed on both sides of the grid assembly 71 along a first direction X, the first arc inlet 711 being disposed at the entrance of the first arc extinguishing chamber 70, the arc being able to enter the first grid assembly 71 through the first arc inlet 711, and being cut and extinguished by the grids spaced apart, the first row of arc outlets 712 being disposed at the exit of the first arc extinguishing chamber 70, for discharging the gas formed after the arc is extinguished, the first anti-breakdown component 72 and the elution net 73 being stacked along the first direction X and covered on the first row of arc outlets 712.

[0048] In a specific implementation, when the gas is discharged from the first row of arc openings 712, the setting of the first anti-breakdown component 72 can prevent the phenomenon of re-breakdown and arcing, and the deionized net 73 can eliminate the electric particles in the gas, so that the gas will not cause damage to the circuit breaker after being discharged from the circuit breaker through the outlet 30.

[0049] like Figure 6 As shown, an arc extinguishing system of an embodiment of the present application, wherein the second arc extinguishing chamber 80 includes a second grid assembly 81 and a second breakdown protection member 82, the second grid assembly 81 includes a plurality of grids stacked along a third direction Z and a second arc inlet 811 and a second row of arc outlets 812 arranged on both sides of the second grid assembly 81 along a first direction X, the second arc inlet 811 is arranged at the entrance of the second arc extinguishing chamber 80, the arc can enter the second grid assembly 81 through the second arc inlet 811, and is cut and extinguished by the grids arranged at intervals, the second row of arc outlets 812 is arranged at the exit of the second arc extinguishing chamber 80, and is used to discharge the gas formed after the arc is extinguished, and the second breakdown protection member 82 is covered by the second row of arc outlets 812.

[0050] In a specific implementation, when the gas is discharged from the second row of arc openings 812, the second anti-breakdown member 82 can prevent the gas from breaking down again and forming an arc flashover.

[0051] Figure 7 What is shown in the figure is the current path in the arc extinguishing system. The current passes through the first arc-striking plate 61, the second arc-striking plate 62 and the third arc-striking plate 63, and forms a current loop together with the arc in the first grid assembly 71 and the second grid assembly 81.

[0052] like Figure 5 As shown, the arc extinguishing system of the embodiment of the present application further includes: a gas producing component 50, the gas producing component 50 includes a first gas producing sheet 51 and a second gas producing sheet 52, a gas producing channel 53 is provided between the first gas producing sheet 51 and the second gas producing sheet 52, a first end of the gas producing channel 53 is arranged toward the contact assembly 20, and a second end is connected with the entrance of the first arc extinguishing chamber 70 and the arc striking channel 90, so that the arc can enter the first arc extinguishing chamber 70 and the gas producing channel 53 through the gas producing channel 53, which has the function of guiding the arc, avoiding the arc directly entering the second arc extinguishing chamber 80, thereby failing to completely extinguish the arc.

[0053] In a specific implementation, the first gas producing sheet 51 and the second gas producing sheet 52 of the gas producing assembly 50 are both made of gas producing materials. When the arc passes through the gas producing channel 53, the gas generated by the first gas producing sheet 51 and the second gas producing sheet 52 can drive the arc into the first arc extinguishing chamber 70, thereby preventing the arc from being retained between the contact assembly 20 and the first arc extinguishing chamber 70, and allowing the arc to be extinguished in the first arc extinguishing chamber 70.

[0054] An embodiment of the present application also provides a circuit breaker, wherein the circuit breaker includes a contact assembly 20, a main air outlet 30, a shell 40 and the above-mentioned arc extinguishing system, and the arc extinguishing system 10, the contact assembly 20 and the air outlet 30 are all arranged inside the shell 40.

[0055] In a specific implementation, the circuit breaker includes the above-mentioned arc extinguishing system 10, and the arc extinguishing system includes an arc striking assembly 60, a first arc extinguishing chamber 70, a second arc extinguishing chamber 80 and an arc striking channel 90. The first arc extinguishing chamber 70 is electrically connected to the contact assembly 20 through the first arc striking piece 61 of the arc striking assembly 60, and the second arc extinguishing chamber 80 can be electrically connected to the contact assembly 20 through the cooperation between the second arc striking piece 62 of the arc striking assembly 60 and the arc striking channel 90, so as to disperse the arc generated by the contact assembly 20 and extinguish the arc separately, thereby ensuring the arc extinguishing effect. Since the first arc extinguishing chamber 70 and the second arc extinguishing chamber 80 are arranged along the second direction Y, the arc striking channel 90 is arranged on one side of the first arc extinguishing chamber 70 along the third direction Z, and the arc striking channel 90 and the second arc extinguishing chamber 80 are not arranged behind the first arc extinguishing chamber 70 along the first direction X, there is no need to increase the overall length and volume of the circuit breaker in the first direction X, and the space inside the circuit breaker in the second direction Y and the third direction Z is reasonably utilized, thereby reducing the modification cost of the circuit breaker.

[0056] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0057] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. An arc extinguishing system, characterized in that: Arranged between a contact assembly (20) and an air outlet (30) of a circuit breaker, the arc extinguishing system (10) comprises: An arc-striking assembly (60) electrically connected to the contact assembly (20), the arc-striking assembly (60) comprising a first arc-striking piece (61) and a second arc-striking piece (62); a first arc-extinguishing chamber (70) electrically connected to the contact assembly (20) via the first arc-striking piece (61); the first arc-extinguishing chamber (70) being arranged on one side of the contact assembly (20) along a first direction (X); and the first arc-extinguishing chamber (70) being in communication with the gas outlet (30); a second arc-extinguishing chamber (80), electrically connected to the contact assembly (20) via the second arc-striking piece (62), the second arc-extinguishing chamber (80) being arranged on one side of the first arc-extinguishing chamber (70) along the second direction (Y), the second arc-extinguishing chamber (80) being in communication with the gas outlet (30); An arc-striking channel (90) is arranged between the first arc-striking chamber (70) and the second arc-striking piece (62) along a third direction (Z). The arc-striking channel (90) is electrically connected to the contact assembly (20) and the second arc-striking chamber (80) through the second arc-striking piece (62). The arc-striking channel (90) can guide the arc of the contact assembly (20) into the second arc-striking chamber (80).

2. The arc extinguishing system according to claim 1, characterized in that: The length of the first arc extinguishing chamber (70) along the third direction (Z) is smaller than the length of the second arc extinguishing chamber (80) along the third direction (Z), and on a plane perpendicular to the second direction (Y), the projections of the first arc extinguishing chamber (70) and the arc striking channel (90) both fall within the projection range of the second arc extinguishing chamber (80).

3. The arc extinguishing system according to claim 1, characterized in that: Also includes: An insulating isolation plate (100), the first arc extinguishing chamber (70) and the arc striking channel (90) are arranged on one side of the insulating isolation plate (100) along the second direction (Y), the second arc extinguishing chamber (80) is arranged on the other side of the insulating isolation plate (100) along the second direction (Y), and the second arc striking plate (62) is arranged across the insulating isolation plate (100) along the second direction (Y).

4. The arc extinguishing system according to claim 1, characterized in that: Also includes: An exhaust channel (110) is arranged on a side of the second arc extinguishing chamber (80) away from the first arc extinguishing chamber (70) along the second direction (Y), and one end of the exhaust channel (110) is arranged to be connected to the second arc extinguishing chamber (80), and the other end is arranged to be connected to the gas outlet (30).

5. The arc extinguishing system according to claim 4, characterized in that: The inlet of the first arc extinguishing chamber (70) is arranged on a side of the arc extinguishing system (10) close to the contact assembly (20) and facing the contact assembly (20); the outlet of the first arc extinguishing chamber (70) is arranged toward the gas outlet (30); the inlet of the second arc extinguishing chamber (80) is arranged on a side of the arc extinguishing system (10) away from the contact assembly (20) and facing away from the contact assembly (20); the outlet of the second arc extinguishing chamber (80) is arranged on a side of the arc extinguishing system (10) close to the contact assembly (20) and connected to the exhaust channel (110).

6. The arc extinguishing system according to claim 1, characterized in that: The arc-striking assembly (60) also includes a third arc-striking piece (63), and the third arc-striking piece (63) includes a first connecting portion (631), a second connecting portion (632) and a third connecting portion (633) which are connected in sequence at a preset angle, the first connecting portion (631) and the first arc-striking piece (61) are respectively arranged on both sides of the first arc-extinguishing chamber (70) along the third direction (Z), the second connecting portion (632) is arranged on a side of the second arc-extinguishing chamber (80) away from the contact assembly (20), and the third connecting portion (633) and the second arc-striking piece (62) are respectively arranged on both sides of the second arc-extinguishing chamber (80).

7. The arc extinguishing system according to claim 1, characterized in that: The first arc extinguishing chamber (70) comprises a first grid plate assembly (71), a first anti-breakdown component (72) and an evacuation net (73); the first grid plate assembly (71) comprises a plurality of grid plates arranged at intervals along the third direction (Z) and a first arc inlet (711) and a first row of arc inlets (712) arranged on both sides of the first grid plate assembly (71) along the first direction (X); the first arc inlet (711) is arranged at the entrance of the first arc extinguishing chamber (70), the first row of arc inlets (712) is arranged at the exit of the first arc extinguishing chamber (70), and the first anti-breakdown component (72) and the evacuation net (73) are stacked along the first direction (X) and covered on the first row of arc inlets (712).

8. The arc extinguishing system according to claim 1, characterized in that: The second arc extinguishing chamber (80) comprises a second grid plate assembly (81) and a second breakdown prevention member (82); the second grid plate assembly (81) comprises a plurality of grid plates stacked along the third direction (Z) and a second arc inlet (811) and a second row of arc outlets (812) arranged on both sides of the second grid plate assembly (81) along the first direction (X); the second arc inlet (811) is arranged at the entrance of the second arc extinguishing chamber (80), the second row of arc outlets (812) is arranged at the exit of the second arc extinguishing chamber (80), and the second breakdown prevention member (82) is covered on the second row of arc outlets (812).

9. The arc extinguishing system according to claim 1, characterized in that: Also includes: A gas producing component (50), wherein the gas producing component (50) comprises a first gas producing sheet (51) and a second gas producing sheet (52), wherein a gas producing channel (53) is provided between the first gas producing sheet (51) and the second gas producing sheet (52), wherein a first end of the gas producing channel (53) is arranged toward the contact assembly (20), and a second end is connected to an entrance of the first arc extinguishing chamber (70) and the arc striking channel (90).

10. A circuit breaker, characterized in that: The circuit breaker comprises a contact assembly (20), a main air outlet (30), a housing (40) and an arc extinguishing system as claimed in any one of claims 1 to 9, wherein the arc extinguishing system (10), the contact assembly (20) and the air outlet (30) are all arranged inside the housing (40).

Images