Arc extinguishing system and circuit breaker

Abstract

The invention discloses an arc extinguishing system and a circuit breaker, the arc extinguishing system is arranged between a contact assembly and an air outlet of the circuit breaker, and the arc extinguishing system comprises a first arc striking assembly; the first arc extinguish chamber is electrically connected with the contact assembly through the first arc striking assembly, and the contact assembly is arranged on one side of the first arc extinguish chamber in the first direction; the second arc extinguish chamber is arranged on one side of the first arc extinguish chamber along the second direction, the projections of the first arc extinguish chamber and the second arc extinguish chamber on a plane perpendicular to the second direction are overlapped, and the second arc extinguish chamber is arranged between the first arc extinguish chamber and the air outlet; and the first arc extinguish chamber is electrically connected with the second arc extinguish chamber through the second arc ignition assembly, and the second arc ignition assembly is used for introducing the electric arc of the first arc extinguish chamber 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 guaranteed, meanwhile, 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, due to the increase in the overall voltage of the system, in order to achieve complete arc extinguishing, it is necessary to increase the space of the arc extinguishing chamber and the overall length of the arc extinguishing grid to increase the path length of the arc passing through the arc extinguishing grid, so as to completely extinguish 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, the contact assembly and the air outlet are all arranged inside the housing of the circuit breaker, and the arc extinguishing system includes: a first arc striking assembly; a first arc extinguishing chamber, the first arc extinguishing chamber is electrically connected to the contact assembly through the first arc striking assembly, and the contact assembly is arranged on one side of the first arc extinguishing chamber along a first direction; a second arc extinguishing chamber, which is arranged on one side of the first arc extinguishing chamber along a second direction, and the projections of the first arc extinguishing chamber and the second arc extinguishing chamber on a plane perpendicular to the second direction overlap, and the second arc extinguishing chamber is arranged between the first arc extinguishing chamber and the air outlet; a second arc striking assembly, the first arc extinguishing chamber is electrically connected to the second arc extinguishing chamber through the second arc striking assembly, and the second arc striking assembly is used to introduce the arc of the first arc extinguishing chamber into the second arc extinguishing chamber.

[0006] As in the arc extinguishing system above, 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, and the outlet of the first arc extinguishing chamber and the inlet of the second arc extinguishing chamber are arranged on the side of the arc extinguishing system away from the contact assembly and facing away from the contact assembly.

[0007] The arc extinguishing system as above, wherein the arc extinguishing system also includes: an insulating isolation plate, the first arc striking assembly and the first arc extinguishing chamber are both arranged on one side of the insulating isolation plate along the second direction, the second arc extinguishing chamber is arranged on the other side of the insulating isolation plate along the second direction, and the second arc striking assembly is arranged across the insulating isolation plate along the second direction.

[0008] The arc extinguishing system as above, wherein the arc extinguishing system also includes: an exhaust channel, which is extended along the first direction, the outlet of the exhaust channel is arranged on the side of the arc extinguishing system away from the contact assembly, the exhaust channel is arranged on the side of the second arc extinguishing chamber along the second direction away from the first arc extinguishing chamber, 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 the arc extinguishing system above, the first arc-striking assembly includes a first arc-striking plate and a second arc-striking plate spaced apart along a third direction, the first arc-extinguishing chamber includes two first grid plate assemblies spaced apart along the third direction, the first grid plate assembly includes a plurality of grid plates stacked along the third direction, and the contact assembly is electrically connected to the two first grid plate assemblies respectively through the first arc-striking plate and the second arc-striking plate.

[0010] As above arc extinguishing system, wherein the second arc-striking assembly includes two third arc-striking plates arranged at intervals along a third direction, the third arc-striking plates include a first arc-striking segment, a connecting segment and a second arc-striking segment connected to each other, the first arc-striking segments of the two third arc-striking plates are electrically connected to the two first grid plate assemblies respectively, and the two first arc-striking segments are arranged between the two first grid plate assemblies, the two second arc-striking segments are electrically connected to the second arc extinguishing chamber, and there is an arc channel between the two third arc-striking plates.

[0011] As the arc extinguishing system above, the second arc extinguishing chamber includes a second grid assembly, the second grid assembly includes a plurality of grids stacked along a third direction, the second grid assembly includes a second arc entrance port and a second row of arc entrance ports, the second arc entrance port is connected to the arc channel, and the two second arc striking sections are respectively arranged on the two side surfaces of the second grid assembly along the third direction.

[0012] As the arc extinguishing system above, the first arc extinguishing chamber also includes two first anti-breakdown parts, the first grid assembly includes a first arc inlet and a first row of arc outlets, the two first arc inlet ports are respectively arranged toward the first arc striking plate and the second arc striking plate, and the two first anti-breakdown parts are respectively covered on the two first rows of arc outlets.

[0013] In the arc extinguishing system as above, the first arc extinguishing chamber further comprises two deionization components, the deionization components are arranged on a side of the first anti-breakdown component away from the first row of arc openings, and the deionization components comprise connected arc baffles and deionization nets.

[0014] In the arc extinguishing system as above, the second arc extinguishing chamber further comprises a second anti-breakdown member, and the second anti-breakdown member cover is arranged on the second row of arc openings.

[0015] 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, the contact assembly includes a plurality of first contacts and a plurality of second contacts, along the second direction, the second contact is arranged on a side close to the first arc extinguishing chamber and is electrically connected to the first arc extinguishing chamber, and the second contact is arranged to protrude from the first contact in the direction toward the arc extinguishing system.

[0016] The arc extinguishing system of the present application includes a first arc striking assembly, a first arc extinguishing chamber, a second arc extinguishing chamber and a second arc striking assembly. The contact assembly is arranged on one side of the first arc extinguishing chamber along the first direction and is electrically connected through the first arc striking assembly. The first arc striking assembly can introduce the arc into the first arc extinguishing chamber for arc extinguishing. The second arc extinguishing chamber is arranged along the second direction with the first arc extinguishing chamber and is electrically connected through the second arc striking assembly. The second arc striking assembly can introduce the remaining arc after the arc is extinguished by the first arc striking assembly into the second arc extinguishing chamber to achieve complete arc extinguishing, thereby ensuring the arc extinguishing effect. Moreover, the second arc extinguishing chamber reasonably utilizes the space inside the housing of the circuit breaker in the second direction, and is not continued to be arranged behind the first arc extinguishing chamber along the first direction. Therefore, there is no need to increase the length of the housing of the circuit breaker in the first direction, thereby reducing the modification cost of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 A schematic diagram of the internal structure of a circuit breaker according to an embodiment of the present application;

[0019] Figure 2 This is a schematic diagram of the overall structure of the arc extinguishing system of an embodiment of the present application;

[0020] Figure 3 A schematic diagram of the path of an arc in a circuit breaker according to an embodiment of the present application;

[0021] Figure 4 A schematic structural diagram of a first arc extinguishing chamber of an arc extinguishing system according to an embodiment of the present application;

[0022] Figure 5 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 6 An exploded diagram of a circuit breaker according to an embodiment of the present application;

[0024] Figure 7 A schematic diagram of the structure of the second row of arc openings and the second anti-breakdown component of the arc extinguishing system of an embodiment of the present application;

[0025] Figure 8 A schematic diagram of the structure of a second arc striking assembly of an arc extinguishing system according to an embodiment of the present application;

[0026] Fig. 9 A schematic diagram of a current loop in an arc extinguishing system according to an embodiment of the present application;

[0027] Fig.10 This is a schematic structural diagram of a contact assembly of a circuit breaker according to an embodiment of the present application.

[0028] Description of Figure Numbers:

[0029] 10. Arc extinguishing system; 20. Contact assembly; 21. First contact; 22. Second contact; 30. Gas outlet; 40. Housing; 50. First arc ignition assembly; 51. First arc ignition plate; 52. Second arc ignition plate; 60. First arc extinguishing chamber; 61. First grid assembly; 62. First arc inlet; 63. First row of arc outlets; 64. First anti-breakdown component; 65. Elimination assembly; 651. Arc baffle; 652. Eliminate free net; 70, second arc extinguishing chamber; 71, second grid assembly; 72, second arc inlet; 73, second row of arc outlets; 74, second anti-breakdown member; 80, second arc-starting assembly; 81, third arc-starting sheet; 82, first arc-starting section; 83, connecting section; 831, first connecting section; 832, second connecting section; 84, second arc-starting section; 85, arc channel; 90, insulating isolation plate; 100, exhaust channel;

[0030] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0031] 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.

[0032] like Figure 1 and Figure 2As shown, an embodiment of the present application provides an arc extinguishing system, wherein the arc extinguishing system 10, the contact assembly 20 and the gas outlet 30 of the circuit breaker are arranged between the arc extinguishing system 10, the contact assembly 20 and the gas outlet 30 are all arranged inside the housing 40 of the circuit breaker, and the arc extinguishing system 10 includes: a first arc striking assembly 50; a first arc extinguishing chamber 60, the first arc extinguishing chamber 60 is electrically connected to the contact assembly 20 through the first arc striking assembly 50, and the contact assembly 20 is arranged on one side of the first arc extinguishing chamber 60 along the first direction X; a second The arc extinguishing chamber 70 is arranged on one side of the first arc extinguishing chamber 60 along the second direction Y, and the projections of the first arc extinguishing chamber 60 and the second arc extinguishing chamber 70 on a plane perpendicular to the second direction Y are overlapped, and the second arc extinguishing chamber 70 is arranged between the first arc extinguishing chamber 60 and the gas outlet 30; the second arc striking assembly 80, the first arc extinguishing chamber 60 is electrically connected to the second arc extinguishing chamber 70 through the second arc striking assembly 80, and the second arc striking assembly 80 is used to introduce the arc of the first arc extinguishing chamber 60 into the second arc extinguishing chamber 70.

[0033] In specific implementation, the arc extinguishing system of the present application includes a first arc striking assembly 50, a first arc extinguishing chamber 60, a second arc extinguishing chamber 70 and a second arc striking assembly 80. The contact assembly 20 is arranged on one side of the first arc extinguishing chamber 60 along the first direction X and is electrically connected through the first arc striking assembly 50. The first arc striking assembly 50 can introduce the arc into the first arc extinguishing chamber 60 for arc extinguishing. The second arc extinguishing chamber 70 is arranged with the first arc extinguishing chamber 60 along the second direction Y and is electrically connected through the second arc striking assembly 80. The second arc striking assembly 80 can introduce the remaining arc after the arc extinguishing of the first arc striking assembly 50 into the second arc extinguishing chamber 70 to achieve complete arc extinguishing, thereby ensuring the arc extinguishing effect. Moreover, the second arc extinguishing chamber 70 reasonably utilizes the space inside the housing 40 of the circuit breaker in the second direction Y, and is not continued to be arranged behind the first arc extinguishing chamber 60 along the first direction X. Therefore, there is no need to increase the length of the housing 40 of the circuit breaker in the first direction X, thereby reducing the modification cost of the circuit breaker.

[0034] like Figure 1 and Figure 3 As shown, the arc extinguishing system of an embodiment of the present application, wherein the inlet of the first arc extinguishing chamber 60 is arranged on the side of the arc extinguishing system 10 close to the contact assembly 20 and is arranged facing the contact assembly 20, and the outlet of the first arc extinguishing chamber 60 and the inlet of the second arc extinguishing chamber 70 are arranged on the side of the arc extinguishing system 10 away from the contact assembly 20 and are arranged away from the contact assembly 20.

[0035] In specific implementation, after the contact assembly 20 generates an arc, the arc can enter the first arc extinguishing chamber 60 directly from the entrance of the first arc extinguishing chamber 60 arranged facing the contact assembly 20 to extinguish the arc under the arc ignition action of the first arc ignition assembly 50. After the arc passes through the first arc extinguishing chamber 60, the remaining arc after arc extinguishing reaches the side of the arc extinguishing system 10 away from the contact assembly 20. A part of the arc enters the second arc extinguishing chamber 70 from the entrance of the second arc extinguishing chamber 70 arranged away from the contact assembly 20 under the arc ignition action of the first arc ignition assembly 50, and the other part is discharged to the outside through the outlet of the first arc extinguishing chamber 60. The setting of the entrance positions of the first arc extinguishing chamber 60 and the second arc extinguishing chamber 70 enables the arc to pass through the complete first arc extinguishing chamber 60 along the first direction X and reach the entrance of the second arc extinguishing chamber 70 or be discharged to the outside through the outlet of the first arc extinguishing chamber 60, so that the arc extinguishing effect of the first arc extinguishing chamber 60 can be fully utilized, thereby achieving the best arc extinguishing effect.

[0036] Specifically, the inner surface of the shell 40 arranged opposite to the outlet of the first arc extinguishing chamber 60 and the inlet of the second arc extinguishing chamber 70 is an arc surface, which can guide the arc discharged from the outlet of the first arc extinguishing chamber 60 to the inlet of the second arc extinguishing chamber 70.

[0037] like Figure 1 As shown, the arc extinguishing system of an embodiment of the present application, wherein the arc extinguishing system 10 also includes: an insulating isolation plate 90, a first arc-striking assembly 50 and a first arc-extinguishing chamber 60 are both arranged on one side of the insulating isolation plate 90 along the second direction Y, the second arc-striking chamber 70 is arranged on the other side of the insulating isolation plate 90 along the second direction Y, and the second arc-striking assembly 80 is arranged across the insulating isolation plate 90 along the second direction Y, so that the first arc-striking chamber 60 and the second arc-striking chamber 70 arranged on both sides of the insulating isolation plate 90 can be electrically connected, and the arc can also be discharged through the outlet of the first arc-striking chamber 60, and introduced into the second arc-striking chamber 70 by the second arc-striking assembly 80 for further arc extinguishing.

[0038] In a specific implementation, the provision of the insulating isolation plate 90 can prevent the first arc extinguishing chamber 60 and the second arc extinguishing chamber 70 from being connected in the second direction Y, thereby preventing the arc from directly entering the second arc extinguishing chamber 70 during the process of passing through the first arc extinguishing chamber 60 along the first direction X. This situation will result in the arc not being completely extinguished along the first direction X, and the optimal arc extinguishing effect cannot be achieved. The air discharged from the second arc extinguishing chamber 70 still contains part of the arc, causing damage to the circuit breaker.

[0039] like Figure 1As shown, the arc extinguishing system of an embodiment of the present application, wherein the arc extinguishing system 10 also includes: an exhaust channel 100, which is extended along the first direction X, and the outlet of the exhaust channel 100 is arranged on the side of the arc extinguishing system 10 away from the contact assembly 20, and the exhaust channel 100 is arranged on the side of the second arc extinguishing chamber 70 along the second direction Y away from the first arc extinguishing chamber 60, one end of the exhaust channel 100 is connected to the second arc extinguishing chamber 70, and the other end is connected to the outlet 30.

[0040] In specific implementation, when the contact assembly 20 is in action, an arc and gas will be generated simultaneously. After the arc is extinguished by the second arc extinguishing chamber 70, the remaining gas is discharged from the outlet of the second arc extinguishing chamber 70 into the exhaust channel 100, and the gas flows along the first direction X to the outlet of the exhaust channel 100. During the flow in the exhaust channel 100, the residual charged particles in the gas gradually disappear, so that after the gas is discharged from the outlet of the exhaust channel 100, the gas will not re-break down to form an arc, thereby avoiding the damage of the circuit breaker caused by the arc.

[0041] Specifically, the outlet of the second arc extinguishing chamber 70 and the inlet of the exhaust channel 100 are both arranged on one side of the arc extinguishing system 10 close to the contact assembly 20, and are connected to each other. In the process of the arc moving from the entrance to the outlet of the second arc extinguishing chamber 70, it can completely pass through the entire second arc extinguishing chamber 70 along the first direction X, thereby achieving complete arc extinguishing and achieving the best arc extinguishing effect. The inlet and outlet of the exhaust channel 100 are respectively arranged at the top and bottom of the arc extinguishing system 10, ensuring the length of the exhaust channel 100 along the first direction X, so that the gas can fully eliminate the charged particles in the gas when passing through the exhaust channel 100.

[0042] When implementing it, Figure 3 As shown, the arrow direction in the figure is the path of the arc and gas. The arc and gas enter from the entrance of the first arc extinguishing chamber 60, move along the first direction X, and reach the outlet located at the top of the first arc extinguishing chamber 60 after the arc is extinguished by the first arc extinguishing chamber 60. Under the arc ignition action of the second arc ignition assembly 80, the arc and gas enter the entrance of the top of the second arc extinguishing chamber 70, and move toward the bottom along the first direction X. After the arc is extinguished by the second arc extinguishing chamber 70, the gas is discharged from the outlet at the bottom of the second arc extinguishing chamber 70 to the entrance of the exhaust channel 100. The gas flows in the exhaust channel 100 along the first direction X to the outlet at the top of the exhaust channel 100, and is discharged from the outlet. The positions of the entrance and exit of the first arc extinguishing chamber 60, the second arc extinguishing chamber 70 and the exhaust channel 100 are arranged so that the arc and gas can be fully extinguished in the limited space in the housing 40 of the circuit breaker.

[0043] like Figure 2 and Figure 4As shown, an arc extinguishing system of an embodiment of the present application, wherein the first arc-striking assembly 50 includes a first arc-striking plate 51 and a second arc-striking plate 52 spaced apart along a third direction Z, the first arc-striking chamber 60 includes two first grid plate assemblies 61 spaced apart along a third direction Z, the first grid plate assembly 61 includes a plurality of grid plates stacked along the third direction Z, and the contact assembly 20 is electrically connected to the two first grid plate assemblies 61 through the first arc-striking plate 51 and the second arc-striking plate 52, respectively.

[0044] In specific implementation, the first arc-starting plate 51 and the second arc-starting plate 52 can respectively introduce most of the arc formed by the contact assembly 20 into the two first grid plate assemblies 61, so that the first grid plate assemblies 61 can extinguish the internal arc. During the arc extinguishing process, the grid plates stacked along the third direction Z can divide the long arc into multiple short arcs. After passing through the grid plates extending along the first direction X, most of the short arcs can be extinguished and discharged from the outlet of the first arc extinguishing chamber 60.

[0045] Specifically, the first arc-starting plate 51 and the second arc-starting plate 52 are respectively connected to the opposite sides of the two first grid plate assemblies 61 . Such an arrangement enables the arc to enter all the grid plates, and can effectively ensure the arc extinguishing effect of the two first grid plate assemblies 61 .

[0046] like Figure 2 and Figure 5 As shown, the arc extinguishing system of the embodiment of the present application, wherein the second arc-striking assembly 80 includes two third arc-striking plates 81 spaced apart along the third direction Z, the third arc-striking plates 81 include a first arc-striking segment 82, a connecting segment 83 and a second arc-striking segment 84 connected to each other, the first arc-striking segments 82 of the two third arc-striking plates 81 are electrically connected to the two first grid plate assemblies 61, respectively, and the two first arc-striking segments 82 are arranged between the two first grid plate assemblies 61, the two second arc-striking segments 84 are electrically connected to the second arc extinguishing chamber 70, and an arc channel 85 is provided between the two third arc-striking plates 81.

[0047] During specific implementation, a portion of the arc formed by the contact assembly 20 enters the two first grid assemblies 61 for arc extinguishing, and the other portion is located between the two first grid assemblies 61 and enters the arc channel 85. After passing through the connecting section 83 and the second arc-starting section 84, it enters the second arc-extinguishing chamber 70 for arc extinguishing.

[0048] like Figure 2 and Figure 7As shown, an arc extinguishing system of an embodiment of the present application, wherein the second arc extinguishing chamber 70 includes a second grid assembly 71, the second grid assembly 71 includes a plurality of grids stacked along a third direction Z, the second grid assembly 71 includes a second arc entry port 72 and a second row of arc openings 73, the second arc entry port 72 is connected to an arc channel 85, and two second arc-starting segments 84 are respectively arranged on two side surfaces of the second grid assembly 71 along the third direction Z. Under the guidance of the connecting segment 83 and the second arc-starting segment 84, the arc diffuses from the narrower arc channel 85 to the wider second grid assembly 71, and the arc is elongated as a whole. The elongated arc is divided into short arcs by the grids stacked along the third direction Z for arc extinguishing, thereby improving the arc extinguishing effect.

[0049] In specific implementation, the second arc inlet 72 is arranged at the entrance of the second arc extinguishing chamber 70, and can introduce the arc in the arc channel 85 into the second grid assembly 71 for arc extinguishing. The second arc discharge port 73 is arranged at the exit of the second arc extinguishing chamber 70, and can discharge the arc and gas after arc extinguishing from the second grid assembly 71, and discharge the second arc extinguishing chamber 70 into the exhaust channel 100.

[0050] Specifically, Figure 8 As shown, the connecting section 83 includes a first connecting section 831 and a second connecting section 832. One end of the first connecting section 831 is arranged in the first arc extinguishing chamber 60 and connected to the first arc striking section 82, and the other end is arranged in the second arc extinguishing chamber 70 and connected to the second connecting section 832. The partial arc channel 85 formed by the two first connecting sections 831 can introduce the arc in the first arc extinguishing chamber 60 into the second arc extinguishing chamber 70, so that the arc can be extinguished in the second arc extinguishing chamber 70; one end of the second connecting section 832 is connected to the first connecting section 831, and the other end is connected to the second arc striking section 84. The second connecting section 832 is obliquely connected to the second arc striking section 84 and the first connecting section 831, which can increase the width of the arc channel 85 in the third direction Z, so that the arc channel 85 can accommodate more grids to form a second grid assembly 71 with an arc extinguishing effect.

[0051] When it comes to specific implementation, Fig. 9 The current path formed by the arc and the current is shown in FIG. 2 . The arc formed by the contact assembly 20 enters the first grid assembly 61 and the second grid assembly 71 under guidance. Fig. 9The arrow between the middle grid plates is the arc. At the same time, there is current in the contact assembly 20, the first arc-starting plate 51, the second arc-starting plate 52 and the two third arc-starting plates 81. The current path is from the contact assembly 20 to the first arc-starting plate 51, the first arc-starting plate 51 and the first third arc-starting plate 81 are electrically connected through the arc in the first first grid plate assembly 61, the first third arc-starting plate 81 and the second third arc-starting plate 81 are electrically connected through the arc in the second grid plate assembly 71, and the second third arc-starting plate 81 and the second arc-starting plate 52 are electrically connected through the arc in the second first grid plate assembly 61. Finally, the current reaches the second arc-starting plate 52 to form a current loop.

[0052] like Figure 6 As shown, the arc extinguishing system of the embodiment of the present application, wherein the first arc extinguishing chamber 60 further includes two first anti-breakdown members 64, the first grid assembly 61 includes a first arc inlet 62 and a first row of arc outlets 63, the two first arc inlet 62 are respectively arranged toward the first arc-starting sheet 51 and the second arc-starting sheet 52, and the two first anti-breakdown members 64 are respectively covered on the two first rows of arc outlets 63. The arrangement of the first anti-breakdown member 64 ensures that when the arc is discharged from the first row of arc outlets 63 after arc extinguishing, it is not directly discharged to the outside, but enters the first anti-breakdown member 64 for buffering, thereby preventing the phenomenon of re-breakdown when entering the air.

[0053] like Figure 6 As shown, the arc extinguishing system of an embodiment of the present application, wherein the first arc extinguishing chamber 60 also includes two deionization components 65, the deionization component 65 is arranged on a side of the first anti-breakdown component 64 away from the first row of arc openings 63, and the deionization component 65 includes an arc baffle plate 651 and a deionization net 652 connected to each other.

[0054] During specific implementation, after the arc is buffered by the first anti-breakdown component 64, part of the arc and air with free electric particles will still be discharged from the first anti-breakdown component 64. The setting of the arc baffle 651 can block the arc to prevent the arc from being directly discharged into the air, and the setting of the free electric particles elimination net 652 can eliminate the free electric particles, so that the gas discharged to the outside air does not contain electric particles, thereby not causing damage to the circuit breaker as a whole.

[0055] Specifically, the first arc entrance port 62 is arranged at the entrance of the first arc extinguishing chamber 60, and the arc can enter the first grid assembly 61 through the first arc entrance port 62 for arc extinguishing. The first row of arc ports 63, the first anti-breakdown component 64 and the anti-ionization component 65 are all arranged at the exit of the first arc extinguishing chamber 60, which can process the arc and discharge the remaining airflow to the outside, so that the airflow will not produce re-breakdown in the outside.

[0056] like Figure 7As shown, in the arc extinguishing system of the embodiment of the present application, the second arc extinguishing chamber 70 further includes a second anti-breakdown member 74, and the second anti-breakdown member 74 is covered on the second row of arc openings 73. When the arc is discharged from the second row of arc openings 73, it can directly enter the second anti-breakdown member 74 for buffering to form a gas without arc, and the gas will not cause damage to the circuit breaker when it is discharged into the external air.

[0057] like Figures 1 to 10 As shown, the embodiment of the present application further provides a circuit breaker, wherein the circuit breaker includes a contact assembly 20, a main gas outlet 30, a housing 40 and the above-mentioned arc extinguishing system, the contact assembly 20 includes a plurality of first contacts 21 and a plurality of second contacts 22, along the second direction Y, the second contact 22 is arranged on a side close to the first arc extinguishing chamber 60 and is electrically connected to the first arc extinguishing chamber 60, and the second contact 22 is arranged protruding from the first contact 21 in the direction toward the arc extinguishing system 10. It should be noted that the first contact 21 is the main contact of the contact assembly 20, the second contact 22 is the arc contact of the contact assembly 20, the second contact 22 can generate an arc, and after the arc is generated, it enters the first arc extinguishing chamber 60 for subsequent arc extinguishing operations.

[0058] In specific implementation, the circuit breaker of the present application includes the above-mentioned arc extinguishing system, and the arc extinguishing system has the following technical effects: the arc extinguishing system includes a first arc striking assembly 50, a first arc extinguishing chamber 60, a second arc extinguishing chamber 70 and a second arc striking assembly 80, the contact assembly 20 is arranged on one side of the first arc extinguishing chamber 60 along the first direction X and is electrically connected through the first arc striking assembly 50, the first arc striking assembly 50 can introduce the arc into the first arc extinguishing chamber 60 for arc extinguishing, the second arc extinguishing chamber 70 is arranged with the first arc extinguishing chamber 60 along the second direction Y and is electrically connected through the second arc striking assembly 80, the second arc striking assembly 80 can introduce the remaining arc after the arc extinguishing of the first arc striking assembly 50 into the second arc extinguishing chamber 70 to achieve complete arc extinguishing, thereby ensuring the arc extinguishing effect, and the second arc extinguishing chamber 70 reasonably utilizes the space inside the housing 40 of the circuit breaker in the second direction Y, and is not continued to be arranged behind the first arc extinguishing chamber 60 along the first direction X, so there is no need to increase the length of the housing 40 of the circuit breaker in the first direction X, thereby reducing the modification cost of the circuit breaker.

[0059] 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.

[0060] 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: The arc extinguishing system (10) is arranged between a contact assembly (20) and an air outlet (30) of a circuit breaker, the arc extinguishing system (10), the contact assembly (20) and the air outlet (30) are all arranged inside a housing (40) of the circuit breaker, and the arc extinguishing system (10) comprises: A first arc striking assembly (50); a first arc extinguishing chamber (60), wherein the first arc extinguishing chamber (60) is electrically connected to the contact assembly (20) via the first arc striking assembly (50), and the contact assembly (20) is arranged on one side of the first arc extinguishing chamber (60) along a first direction (X); A second arc extinguishing chamber (70) is arranged on one side of the first arc extinguishing chamber (60) along a second direction (Y), and the projections of the first arc extinguishing chamber (60) and the second arc extinguishing chamber (70) on a plane perpendicular to the second direction (Y) overlap, and the second arc extinguishing chamber (70) is arranged between the first arc extinguishing chamber (60) and the gas outlet (30); A second arc-striking assembly (80), wherein the first arc-extinguishing chamber (60) is electrically connected to the second arc-extinguishing chamber (70) via the second arc-striking assembly (80), and the second arc-striking assembly (80) is used to introduce the electric arc of the first arc-extinguishing chamber (60) into the second arc-extinguishing chamber (70).

2. The arc extinguishing system according to claim 1, characterized in that: The inlet of the first arc extinguishing chamber (60) is arranged on a side of the arc extinguishing system (10) close to the contact assembly (20) and facing the contact assembly (20), and the outlet of the first arc extinguishing chamber (60) and the inlet of the second arc extinguishing chamber (70) are both arranged on a side of the arc extinguishing system (10) away from the contact assembly (20) and facing away from the contact assembly (20).

3. The arc extinguishing system according to claim 1, characterized in that: The arc extinguishing system (10) further comprises: An insulating isolation plate (90), the first arc-striking assembly (50) and the first arc-extinguishing chamber (60) are both arranged on one side of the insulating isolation plate (90) along the second direction (Y), the second arc-extinguishing chamber (70) is arranged on the other side of the insulating isolation plate (90) along the second direction (Y), and the second arc-striking assembly (80) is arranged across the insulating isolation plate (90) along the second direction (Y).

4. The arc extinguishing system according to claim 1, characterized in that: The arc extinguishing system (10) further comprises: An exhaust channel (100) is arranged to extend along the first direction (X), the outlet of the exhaust channel (100) is arranged on a side of the arc extinguishing system (10) away from the contact assembly (20), the exhaust channel (100) is arranged on a side of the second arc extinguishing chamber (70) away from the first arc extinguishing chamber (60) along the second direction (Y), one end of the exhaust channel (100) is arranged to be connected to the second arc extinguishing chamber (70), and the other end is arranged to be connected to the air outlet (30).

5. The arc extinguishing system according to claim 1, characterized in that: The first arc-striking assembly (50) comprises a first arc-striking plate (51) and a second arc-striking plate (52) arranged at intervals along a third direction (Z); the first arc-extinguishing chamber (60) comprises two first grid plate assemblies (61) arranged at intervals along the third direction (Z); the first grid plate assembly (61) comprises a plurality of grid plates stacked along the third direction (Z); and the contact assembly (20) is electrically connected to the two first grid plate assemblies (61) through the first arc-striking plate (51) and the second arc-striking plate (52), respectively.

6. The arc extinguishing system according to claim 5, characterized in that: The second arc-striking assembly (80) includes two third arc-striking plates (81) arranged at intervals along the third direction (Z), and the third arc-striking plates (81) include a first arc-striking segment (82), a connecting segment (83) and a second arc-striking segment (84) connected to each other. The first arc-striking segments (82) of the two third arc-striking plates (81) are electrically connected to the two first grid plate assemblies (61) respectively, and the two first arc-striking segments (82) are arranged between the two first grid plate assemblies (61). The two second arc-striking segments (84) are electrically connected to the second arc extinguishing chamber (70), and an arc channel (85) is provided between the two third arc-striking plates (81).

7. The arc extinguishing system according to claim 6, characterized in that: The second arc extinguishing chamber (70) comprises a second grid plate assembly (71), the second grid plate assembly (71) comprises a plurality of grid plates stacked along the third direction (Z), the second grid plate assembly (71) comprises a second arc entry opening (72) and a second row of arc openings (73), the second arc entry opening (72) is connected to the arc channel (85), and two second arc striking sections (84) are respectively arranged on two side surfaces of the second grid plate assembly (71) along the third direction (Z).

8. The arc extinguishing system according to claim 5, characterized in that: The first arc extinguishing chamber (60) further comprises two first anti-breakdown components (64); the first grid plate assembly (61) comprises a first arc inlet opening (62) and a first row of arc openings (63); the two first arc inlet openings (62) are respectively arranged towards the first arc striking plate (51) and the second arc striking plate (52); and the two first anti-breakdown components (64) are respectively covered on the two first rows of arc openings (63).

9. The arc extinguishing system according to claim 8, characterized in that: The first arc extinguishing chamber (60) further comprises two deionization assemblies (65), wherein the deionization assemblies (65) are arranged on a side of the first anti-breakdown component (64) away from the first row of arc openings (63), and the deionization assemblies (65) comprise arc baffles (651) and deionization nets (652) connected to each other.

10. The arc extinguishing system according to claim 7, characterized in that: The second arc extinguishing chamber (70) further comprises a second anti-breakdown component (74), wherein the second anti-breakdown component (74) is disposed on the second row of arc openings (73).

11. 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 10, wherein the contact assembly (20) comprises a plurality of first contacts (21) and a plurality of second contacts (22), and along the second direction (Y), the second contact (22) is arranged on a side close to the first arc extinguishing chamber (60) and is electrically connected to the first arc extinguishing chamber (60), and the second contact (22) is arranged to protrude from the first contact (21) in a direction toward the arc extinguishing system (10).

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