circuit breaker

Abstract

The application provides a circuit breaker, which comprises an arc extinguishing system, oppositely arranged contact systems and an exhaust port, and the arc extinguishing system comprises an arc extinguishing assembly and an anti-breakdown assembly. The arc extinguishing assembly comprises a first arc extinguishing chamber, a second arc extinguishing chamber and an arc guiding piece. The projections of the first arc extinguishing chamber and the second arc extinguishing chamber on a first plane in a first direction at least partially overlap, and the two can be electrically connected through the arc guiding piece. The second arc extinguishing chamber is located on the side of the first arc extinguishing chamber away from the contact system. The first direction is parallel to the arrangement direction of the contact system and the exhaust port, and the first plane is perpendicular to the first direction. The anti-breakdown assembly comprises a first insulating piece, which abuts against the side of the second arc extinguishing chamber away from the first arc extinguishing chamber. The first insulating piece is provided with a plurality of first through parts penetrating through the first insulating piece in the first direction, and the first through parts are used for discharging the gas generated by the second arc extinguishing chamber to the exhaust port. The circuit breaker provided by the application can improve the arc extinguishing effect.

Description

Technical Field

[0001] This application relates to the field of circuit switching devices, and in particular to a circuit breaker. Background Technology

[0002] A circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions and closing, carrying, and interrupting current under abnormal circuit conditions within a specified time. Generally, circuit breakers use arc-extinguishing chambers to extinguish the electric arc. These chambers employ stacked metal grids to cut the arc, forcing a long arc into multiple shorter arc segments, thus achieving arc voltage division and cooling.

[0003] Circuit breakers for breaking high-voltage circuits typically include two arc-extinguishing chambers: a first arc-extinguishing chamber and a second arc-extinguishing chamber. The first arc-extinguishing chamber is located closer to the contact system, while the second arc-extinguishing chamber is located further away. During circuit breaking, the arc in the second arc-extinguishing chamber may move to the side away from the first arc-extinguishing chamber, potentially causing a breakdown and reducing the arc-extinguishing effectiveness of the circuit breaker. Summary of the Invention

[0004] This application provides a circuit breaker to improve arc extinguishing effect.

[0005] This application provides a circuit breaker including an arc-extinguishing system and a contact system and an exhaust port disposed opposite to each other. The arc-extinguishing system includes an arc-extinguishing assembly and a breakdown protection assembly. The arc-extinguishing assembly includes a first arc-extinguishing chamber, a second arc-extinguishing chamber, and an arc-guiding element. The projections of the first and second arc-extinguishing chambers onto a first plane along a first direction at least partially overlap, and the two are electrically connected through the arc-guiding element. The second arc-extinguishing chamber is located on the side of the first arc-extinguishing chamber away from the contact system. The first direction is parallel to the arrangement direction of the contact system and the exhaust port, and the first plane is perpendicular to the first direction. The breakdown protection assembly includes a first insulating element abutting against the side of the second arc-extinguishing chamber away from the first arc-extinguishing chamber. The first insulating element has multiple first through-parts extending through itself along the first direction, which are used to exhaust the gas generated by the second arc-extinguishing chamber to the exhaust port.

[0006] In some embodiments, the circuit breaker includes a conductor bar, a terminal block, and a transition plate connected between the conductor bar and the terminal block. The conductor bar and the arc-extinguishing assembly are opposite each other in a second direction, which is parallel to the arrangement direction of the plurality of grid plates of the second arc-extinguishing chamber and intersects with a first direction. The first insulating member includes a first body and a baffle. The first body is provided with a plurality of first through portions. At least a portion of the baffle is disposed on the side of the first body away from the second arc-extinguishing chamber. The baffle extends from the connection between the transition plate and the conductor bar to the side of the terminal block away from the conductor bar. A cavity is formed between the plurality of first through portions opposite to the baffle in the first direction and the baffle. The cavity communicates with the exhaust port.

[0007] In some embodiments, the first body includes an isolation section, a first subsection, and a second subsection. The first subsection and the isolation section are arranged along a second direction. The second subsection is connected to the side of the isolation section near the second arc-extinguishing chamber. The second subsection is opposite to the baffle in a first direction and extends beyond the end of the baffle away from the conductive busbar in the direction from the conductive busbar to the second arc-extinguishing chamber. At least a portion of the isolation section is connected between the baffle and the second subsection and divides the cavity into two sub-cavities opposite to each other in a third direction. The two sub-cavities are respectively connected to the exhaust port. The third direction intersects both the first direction and the second direction.

[0008] In some embodiments, the end of the baffle away from the conductive busbar has a first surface opposite to the second arc-extinguishing chamber, and the first surface, the surface of the first portion away from the second arc-extinguishing chamber, and the surface of the isolation portion away from the second arc-extinguishing chamber are located on the same plane.

[0009] In some embodiments, at least a portion of the first through portion is located between two adjacent grid plates of the second arc-extinguishing chamber. The first insulating member includes a first body and a plurality of first gas guide portions. The first body is provided with a plurality of first through portions. The plurality of first gas guide portions are disposed on the side of the first body facing the second arc-extinguishing chamber. At least a portion of the first through portions are provided with first gas guide portions on at least one side of a third direction, and the gas between two adjacent grid plates of the second arc-extinguishing chamber is introduced into itself through the first gas guide portions. The third direction intersects with the first direction and the arrangement direction of the plurality of grid plates of the second arc-extinguishing chamber.

[0010] In some embodiments, the first air guide portion is a strip-shaped structure and has a first air guide surface facing away from the first body. The distance between the first air guide surface and the first body gradually decreases from the end away from the first through portion to the end close to the first through portion.

[0011] In some embodiments, the plurality of first through portions include a plurality of first through sub-ports and a plurality of second through sub-ports. The plurality of first through sub-ports and the plurality of second through sub-ports are spaced apart along a second direction on a second plane. The second direction is parallel to the arrangement direction of the plurality of grid plates of the second arc-extinguishing chamber. The second plane is perpendicular to the second direction. The projections of the plurality of first through sub-ports along a third direction on the side where the plurality of second through sub-ports are located alternate and spaced apart from the plurality of second through sub-ports in the second direction. Each of the first through sub-ports and the second through sub-ports is provided with a first air guide on one side of the third direction. The air guide directions of the first air guides corresponding to the first through sub-ports and the second through sub-ports are opposite.

[0012] In some embodiments, the anti-breakdown assembly further includes a second insulating member abutting against the side of the first arc-extinguishing chamber facing the second arc-extinguishing chamber. The second insulating member includes a second body and a second gas guide. The second body is provided with a plurality of second through portions. At least a portion of the second through portions is located between two adjacent grid plates of the first arc-extinguishing chamber and is used to discharge the gas generated by the first arc-extinguishing chamber. The plurality of second gas guide portions are disposed on the side of the second body facing the first arc-extinguishing chamber. At least a portion of the second through portions are provided with second gas guide portions on at least one side of a fourth direction and introduce the gas between two adjacent grid plates of the first arc-extinguishing chamber into themselves through the second gas guide portions. The fourth direction intersects the first direction and the arrangement direction of the plurality of grid plates of the first arc-extinguishing chamber.

[0013] In some embodiments, the circuit breaker further includes two opposing side plates, a first arc-extinguishing chamber and a second arc-extinguishing chamber are mounted on the side plates, and the second insulating member further includes an end plate disposed on the second body. The end plate is disposed at one end of the second body in the direction of the stacking of multiple grid plates in the first arc-extinguishing chamber, and the opposite ends of the end plate along the fourth direction are respectively engaged with the two side plates.

[0014] In some embodiments, the first arc-extinguishing chamber includes a first end and a second end opposite in the stacking direction, and the second arc-extinguishing chamber includes a third end and a fourth end opposite in the stacking direction. The projection of the first arc-extinguishing chamber onto the fourth end in the second arc-extinguishing chamber along a first direction covers the first end in the first arc-extinguishing chamber. The second insulating member also includes a gas guide plate connected to the second body. The gas guide plate includes a fifth end stacked with the first end and a sixth end stacked with the fourth end. The gas guide plate guides the gas from the first arc-extinguishing chamber to the exhaust port along the direction from the fifth end to the sixth end. The first insulating member extends from the third end to the fourth end and has a limiting protrusion facing the sixth end. A limiting groove is formed on the side of the sixth end facing the fourth end. The limiting groove is used to accommodate the limiting protrusion and limit the limiting protrusion in the first direction.

[0015] In some embodiments, the arc guide includes a seventh end stacked on top of the fourth end, and a slot is formed on the side of the sixth end of the air guide plate facing the fourth end of the second arc extinguishing chamber, and the seventh end of the arc guide can be inserted into the slot.

[0016] In some embodiments, the circuit breaker further includes two symmetrically arranged first arc-gathering members and two symmetrically arranged second arc-gathering members. At least a portion of the first arc-gathering members is disposed between the first arc-extinguishing chamber and the contact system. The first arc-gathering members include second surfaces facing each other. A first narrow slit is formed between the two second surfaces of the two first arc-gathering members to allow an electric arc to move along the first narrow slit to the first arc-extinguishing chamber. The first arc-gathering members have a first limiting groove on the side opposite to the second surface in a fourth direction, which is inserted one by one into at least a portion of the grid plates of the first arc-extinguishing chamber. The fourth direction is perpendicular to the first direction and the stacking direction of the plurality of grid plates of the first arc-extinguishing chamber. At least a portion of the second arc-gathering members is disposed between the first and second arc-extinguishing chambers. The second arc-gathering members include third surfaces facing each other. A second narrow slit is formed between the two third surfaces of the two second arc-gathering members to allow an electric arc to move along the second narrow slit to the second arc-extinguishing chamber. The second arc-gathering members have a second limiting groove on the side opposite to the third surface in a third direction, which is inserted one by one into at least a portion of the grid plates of the second arc-extinguishing chamber. The third direction is perpendicular to the first direction and the stacking direction of the plurality of grid plates of the second arc-extinguishing chamber.

[0017] In some embodiments, the fourth direction is parallel to the third direction. The first arc-gathering member includes a first arc-gathering portion and a second arc-gathering portion. The first arc-gathering portion is located between the first arc-extinguishing chamber and the contact system. The second arc-gathering portion is located on one side of the first arc-extinguishing chamber in its own grid lamination direction. The end of the second arc-gathering portion facing the second arc-extinguishing chamber has a first stepped surface. The end of the second arc-gathering member facing the contact system has a second stepped surface. The first stepped surface and the second stepped surface abut against each other to form a limiting position of the first arc-gathering member and the second arc-gathering member in the third direction.

[0018] In some embodiments, the contact system includes a stationary contact disposed opposite to the second arc-extinguishing chamber in a first direction. The arc root of the stationary contact is capable of moving toward the second arc-extinguishing chamber. The stationary contact includes a support plate, an arc-blocking member, and a stationary contact point. The stationary contact point is disposed on the side of the support plate facing the arc-extinguishing assembly. The arc-blocking member is attached to the side of the support plate facing the arc-extinguishing assembly and disposed around the stationary contact point. The arc-blocking member is used to prevent the arc root of the stationary contact from moving away from the second arc-extinguishing chamber.

[0019] This application improves the arc extinguishing effect of the second arc extinguishing chamber by installing a first insulating element on the side of the second arc extinguishing chamber away from the first arc extinguishing chamber, thereby blocking the arc and preventing the arc in the part corresponding to the first insulating element in the first direction from moving out of the second arc extinguishing chamber. Attached Figure Description

[0020] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the structure of a circuit breaker according to an embodiment of this application;

[0022] Figure 2 This is a partial structural schematic diagram of a circuit breaker according to an embodiment of this application;

[0023] Figure 3 This is a schematic diagram of a breakdown protection component of a circuit breaker according to an embodiment of this application;

[0024] Figure 4 This is a schematic diagram of the structure of the first insulating component of the circuit breaker according to an embodiment of this application;

[0025] Figure 5 This is a schematic diagram of the structure of the second insulating component of the circuit breaker according to an embodiment of this application;

[0026] Figure 6 This is an exploded view of the second insulating member and side plate of the circuit breaker according to an embodiment of this application;

[0027] Figure 7 yes Figure 6 The assembly diagram of the second insulating component and the side plate is shown.

[0028] Figure 8 yes Figure 5 The diagram shows the structure of the second insulating element from another angle;

[0029] Figure 9 yes Figure 8 The diagram shows a partial structural view of the second insulator from another angle.

[0030] Figure 10 This is a schematic diagram of the structure of the arc-conducting plate of the circuit breaker according to an embodiment of this application;

[0031] Figure 11 yes Figure 9 The second insulating element shown and Figure 10 A schematic diagram of a partial assembly structure of the guide plate is shown.

[0032] Figure 12 This is a schematic diagram of the assembly structure of the first arc-forming component and the second arc-forming component of the circuit breaker according to an embodiment of this application;

[0033] Figure 13 yes Figure 12 The diagram shows the structure of the first arc-forming component;

[0034] Figure 14 yes Figure 12 The diagram shows the structure of the second arc-forming component;

[0035] Figure 15 This is an exploded view of the stationary contact and arc-conducting plate of the circuit breaker according to an embodiment of this application;

[0036] Figure 16 Figure 15The diagram shows the assembly of the stationary contact and the arc guide plate.

[0037] Figure 17 This is another exploded view of the stationary contact and arc-conducting plate of the circuit breaker according to an embodiment of this application;

[0038] Figure 18 yes Figure 17 The assembly diagram of the stationary contact and the arc guide plate is shown.

[0039] Figure 19 This is another structural schematic diagram of the first insulating member of the circuit breaker according to an embodiment of this application;

[0040] Figure 20 This is another structural schematic diagram of the breakdown protection component of the circuit breaker according to an embodiment of this application;

[0041] Figure 21 This is a schematic diagram of another structure of the second insulating component of the circuit breaker according to an embodiment of this application.

[0042] Figure label:

[0043] 1. Contact system;

[0044] 11. Stationary contact; 12. Bearing plate; 13. Arc-blocking component; 131. First sub-section; 132. Second sub-section; 14. Stationary contact;

[0045] 2. Exhaust port;

[0046] 3. Arc extinguishing system;

[0047] 4. Arc extinguishing assembly; 41. First arc extinguishing chamber; 411. First end; 412. Second end; 42. Second arc extinguishing chamber; 421. Third end; 422. Fourth end; 43. Arc guide component; 431. Seventh end;

[0048] 5. Anti-penetration components;

[0049] 51. First insulating component;

[0050] 511. First through section; 5111. First through sub-section; 5112. Second through sub-section; 512. First body; 5121. First reinforcing plate; 513. Baffle; 5131. First surface; 514. Cavity; 5141. Sub-cavity; 515. Isolation section; 516. First division; 517. Second division; 518. First air guide section; 5181. First air guide surface; 519. Limiting protrusion;

[0051] 52. Second insulating component;

[0052] 521. Second body; 5211. Second reinforcing plate; 522. Second air guide section; 523. Second through section; 524. End plate; 525. Air guide plate; 526. Fifth end; 527. Sixth end; 528. Limiting groove; 529. Slot;

[0053] 61. Conductive busbar; 62. Terminal block; 63. Transition plate; 64. Side plate; 65. Arc guide plate; 66. Connecting plate;

[0054] 71. First converging arc component; 711. Second surface; 712. First narrow slit; 713. First limiting groove; 714. First converging arc portion; 715. Second converging arc portion; 716. First stepped surface; 72. Second converging arc component; 721. Third surface; 722. Second narrow slit; 723. Second limiting groove; 724. Second stepped surface;

[0055] X, first direction;

[0056] Y, the second direction;

[0057] Z, Third-party direction;

[0058] A. Fourth direction. Detailed Implementation

[0059] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0060] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0061] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0062] To better understand this application, the following will be combined with... Figures 1 to 21 The embodiments of this application are described below.

[0063] Figure 1 This is a schematic diagram of the structure of a circuit breaker according to an embodiment of this application; Figure 2 This is a partial structural schematic diagram of a circuit breaker according to an embodiment of this application.

[0064] Please see Figure 1 and Figure 2 The circuit breaker provided in this application embodiment includes an arc-extinguishing system 3 and a contact system 1 and an exhaust port 2 arranged opposite to each other. The arc-extinguishing system 3 includes an arc-extinguishing assembly 4 and a breakdown protection assembly 5. The arc-extinguishing assembly 4 includes a first arc-extinguishing chamber 41, a second arc-extinguishing chamber 42, and an arc-guiding element 43. The projections of the first arc-extinguishing chamber 41 and the second arc-extinguishing chamber 42 onto a first plane along a first direction X at least partially overlap, and the two can be electrically connected through the arc-guiding element 43. The second arc-extinguishing chamber 42 is located on the side of the first arc-extinguishing chamber 41 away from the contact system 1. The first direction X is parallel to the arrangement direction of the contact system 1 and the exhaust port 2, and the first plane is perpendicular to the first direction X.

[0065] The anti-breakdown component 5 includes a first insulating member 51, which abuts against the side of the second arc-extinguishing chamber 42 away from the first arc-extinguishing chamber 41. The first insulating member 51 is provided with a plurality of first through portions 511 that penetrate itself along the first direction X. The first through portions 511 are used to discharge the gas generated by the second arc-extinguishing chamber 42 to the exhaust port 2.

[0066] In this embodiment, the projections of the first arc-extinguishing chamber 41 and the second arc-extinguishing chamber 42 along the first direction X onto the first plane can completely overlap or partially overlap. Optionally, the projections of the first arc-extinguishing chamber 41 and the second arc-extinguishing chamber 42 along the first direction X onto the first plane partially overlap.

[0067] In this embodiment, the first insulating member 51 abuts against the side of the second arc-extinguishing chamber 42 near the exhaust port 2. For example, the first insulating member 51 may abut against the entire side of the second arc-extinguishing chamber 42 facing the exhaust port 2, or it may abut against a portion of the second arc-extinguishing chamber 42 facing the exhaust port 2.

[0068] The specific structure of the first through portion 511 is not limited in the embodiments of this application. For example, the first through portion 511 is a through hole or a groove.

[0069] The first insulating element 51 in this embodiment is made of insulating material.

[0070] When the second arc-extinguishing chamber 42 is extinguishing the arc, the arc may move to the side of the second arc-extinguishing chamber 42 away from the first arc-extinguishing chamber 41, causing a breakdown. This prevents at least some of the grid plates of the second arc-extinguishing chamber 42 from performing their arc-extinguishing function, thus affecting the arc-extinguishing effect. This application addresses this by providing a first insulating member 51 on the side of the second arc-extinguishing chamber 42 away from the first arc-extinguishing chamber 41, thereby blocking the arc. This prevents the arc in the portion corresponding to the first insulating member 51 in the first direction X from moving outside the second arc-extinguishing chamber 42, thereby improving the arc-extinguishing effect of the second arc-extinguishing chamber 42, and thus improving the arc-extinguishing effect of the circuit breaker.

[0071] In some embodiments, the first insulating member 51 extends from one end of the second arc-extinguishing chamber 42 in the stacking direction to the other end in the stacking direction.

[0072] Optionally, the dimension of the first insulating member 51 along the third direction Z is greater than or equal to the dimension of the corresponding portion of the second arc-extinguishing chamber 42 along the third direction Z. The third direction Z intersects with the first direction X and the arrangement direction of the grid plates of the second arc-extinguishing chamber 42.

[0073] Optionally, a first through section 511 is provided between any two grid plates of the second arc-extinguishing chamber 42.

[0074] In some embodiments, the circuit breaker includes a conductor bar 61, a terminal block 62, and a transition plate 63 connecting the conductor bar 61 and the terminal block 62. The conductor bar 61 is opposite to the arc extinguishing assembly 4 in a second direction Y. The second direction Y is parallel to the arrangement direction of the plurality of grid plates of the second arc extinguishing chamber 42 and intersects with the first direction X. The first insulating member 51 includes a first body 512 and a baffle 513. The first body 512 is provided with a plurality of first through portions 511. At least a portion of the baffle 513 is disposed on the side of the first body 512 away from the second arc extinguishing chamber 42. The baffle 513 extends from the connection between the transition plate 63 and the conductor bar 61 to the side of the terminal block 62 away from the conductor bar 61. A cavity 514 is formed between the plurality of first through portions 511 opposite to the baffle 513 in the first direction X and the baffle 513. The cavity 514 communicates with the exhaust port 2.

[0075] This application embodiment does not limit the included angle between the transition plate 63 and the conductive busbar 61 and the terminal block 62. For example, the transition plate 63 is connected to the conductive busbar 61 and the terminal block 62 at an obtuse angle.

[0076] In this embodiment, the baffle 513 extends from the connection point between the transition plate 63 and the conductive busbar 61 to the connection point between the transition plate 63 and the terminal block 62. This means that the baffle 513 has two opposing ends, one end located at the connection point between the transition plate 63 and the conductive busbar 61, and the other end located on the side of the terminal block 62 facing away from the conductive busbar 61. The side of the terminal block 62 facing away from the conductive busbar 61 is... Figure 2 The upper side of the middle connector 62.

[0077] The high-temperature gas generated after the electric arc is cut by the second arc-extinguishing chamber 42 will be directly discharged to the transition plate 63 and the terminal block 62, causing the terminal block 62 to weld with the bolts installed on it, resulting in damage to the terminal block 62 and affecting its use. In this application, a baffle 513 is provided on the side of the first body 512 away from the second arc-extinguishing chamber 42. The baffle 513 extends from the connection between the transition plate 63 and the conductive bar 61 to the side of the terminal block 62 away from the conductive bar 61. In this way, the baffle 513 blocks the high-temperature gas, preventing at least part of the high-temperature gas from being directly discharged to the transition plate 63 and the terminal block 62, improving the welding problem between the terminal block 62 and the bolts, and extending the service life of the terminal block 62.

[0078] Figure 3 This is a schematic diagram of a breakdown protection component of a circuit breaker according to an embodiment of this application.

[0079] Please see Figure 3 In some embodiments, the first body 512 includes an isolation portion 515, a first portion 516, and a second portion 517. The first portion 516 and the isolation portion 515 are arranged along the second direction Y. The second portion 517 is connected to the side of the isolation portion 515 near the second arc-extinguishing chamber 42. The second portion 517 is opposite to the baffle 513 in the first direction X and extends beyond the end of the baffle 513 away from the conductive bar 61 in the direction from the conductive bar 61 to the second arc-extinguishing chamber 42. At least a portion of the isolation portion 515 is connected between the baffle 513 and the second portion 517 and divides the cavity 514 into two sub-cavities 5141 opposite to each other in the third direction Z. The two sub-cavities 5141 are respectively connected to the exhaust port 2. The third direction Z intersects both the first direction X and the second direction Y.

[0080] The cavity described above is formed between the second portion 517 and the baffle 513 in this embodiment of the application.

[0081] Optionally, the third direction Z is perpendicular to the first direction X and the second direction Y.

[0082] The shape of the isolation portion 515 is not limited in this embodiment. For example, the isolation portion 515 is a plate-like member. Further optionally, the isolation portion 515 is positioned perpendicular to a third direction Z.

[0083] Optionally, the isolation section 515 extends from one end of the second section 517 away from the first section 516 to one end of the second section 517 close to the first section 516, so as to divide the area opposite to the part of the second section 517 that extends beyond the baffle 513 into two parts, which are respectively connected to two sub-cavities 5141.

[0084] Optionally, the first section 516, the second section 517, and the isolation section 515 are all directly connected. Further, the isolation section 515, the first section 516, the second section 517, and the baffle 513 are integrally formed.

[0085] In this embodiment, the second portion 517 extends beyond the end of the baffle 513 away from the conductive busbar 61 along the direction from the conductive busbar 61 to the second arc-extinguishing chamber 42. Thus, the area of ​​the portion of the second portion 517 extending beyond the baffle 513 along the first direction X can communicate with the two sub-cavities 5141. The two sub-cavities 5141 communicate with the exhaust port 2 through this area, so that the high-temperature gas can be discharged smoothly.

[0086] An isolation section 515 is provided, which is connected between the baffle 513 and the second section 517, and divides the cavity 514 into two sub-cavities 5141. In this way, not only is the structural strength of the first insulating member 51 increased, but the high-temperature gas is also separated, reducing the possibility of high-temperature gas reignition.

[0087] In some embodiments, the end of the baffle 513 away from the conductive busbar 61 has a first surface 5131 opposite to the second arc-extinguishing chamber 42. The first surface 5131, the surface of the first portion 516 away from the second arc-extinguishing chamber 42, and the surface of the isolation portion 515 away from the second arc-extinguishing chamber 42 are located on the same plane.

[0088] This configuration allows the side of the first insulating member 51 facing the exhaust port 2 to be flat, which facilitates the installation of other structures and reduces interference between the first insulating member 51 and other components.

[0089] Figure 4 This is a schematic diagram of the structure of the first insulating component of the circuit breaker according to an embodiment of this application.

[0090] Please see Figure 4 In some embodiments, at least a portion of the first through-hole 511 is located between two adjacent grid plates of the second arc-extinguishing chamber 42. The first insulating member 51 includes a first body 512 and a plurality of first gas guides 518. The first body 512 is provided with a plurality of first through-holes 511, and the plurality of first gas guides 518 are disposed on the side of the first body 512 facing the second arc-extinguishing chamber 42. At least a portion of the first through-holes 511 are provided with first gas guides 518 on at least one side of the third direction Z, and the gas between two adjacent grid plates of the second arc-extinguishing chamber 42 is introduced into itself through the first gas guides 518. The third direction Z intersects with the first direction X and the arrangement direction of the plurality of grid plates of the second arc-extinguishing chamber 42.

[0091] The fact that at least a portion of the first through section 511 is located between two adjacent grid plates of the second arc-extinguishing chamber 42 does not mean that at least a portion of the first through section 511 is provided between any two adjacent grid plates of the second arc-extinguishing chamber 42.

[0092] The shape of the first air guide 518 is not limited in this embodiment. For example, the first air guide 518 can be a single strip structure or multiple spaced block structures.

[0093] The first air guide portion 518 of this application embodiment can be disposed on one side of the first through portion 511 in the third direction Z, or it can be disposed on opposite sides of the first through portion 511 in the third direction Z.

[0094] Optionally, the third direction Z is perpendicular to the arrangement direction of the more than 42 grid plates in the second arc-extinguishing chamber. Further optionally, the first direction X, the arrangement direction of the more than 42 grid plates in the second arc-extinguishing chamber, and the third direction Z are all perpendicular to each other.

[0095] A first gas guide section 518 is provided on the first body 512 to guide the high-temperature gas generated by arc extinguishing between two adjacent grid plates to the first through section 511, thereby allowing the high-temperature gas to move smoothly to the exhaust port 2, improving exhaust efficiency and reducing the risk of explosion due to poor flow of high-temperature gas.

[0096] In some embodiments, the first air guide portion 518 has a strip-shaped structure and a first air guide surface 5181 facing away from the first body 512. The distance between the first air guide surface 5181 and the first body 512 gradually decreases from the end of the first air guide portion 518 away from the first through portion 511 to the end of the first through portion 511 close to the first through portion 511.

[0097] The shape of the first air guiding surface 5181 is not limited in this embodiment. For example, the first air guiding surface 5181 can be a plane, a curved surface, or an irregularly shaped surface combining a plane and a curved surface.

[0098] The first air guide section 518 is designed as a whole strip structure, which facilitates processing and manufacturing.

[0099] In some embodiments, the plurality of first through portions 511 include a plurality of first through sub-portions 5111 and a plurality of second through sub-portions 5112. The plurality of first through sub-portions 5111 and the plurality of second through sub-portions 5112 are spaced apart by projection along the second direction Y onto the second plane. The second direction Y is parallel to the arrangement direction of the plurality of grid plates of the second arc-extinguishing chamber 42. The second plane is perpendicular to the second direction Y. The projections of the plurality of first through sub-portions 5111 along the third direction Z onto the side where the plurality of second through sub-portions 5112 are located alternate with and spaced apart from the plurality of second through sub-portions 5112 in the second direction Y.

[0100] Optionally, the third direction Z, the first direction X, and the second direction Y are perpendicular to each other.

[0101] The projections of the first through sub-section 5111 and the second through sub-section 5112 along the second direction Y on the second plane are spaced apart. The projections of the multiple first through sub-sections 5111 along the third direction Z on the side where the multiple second through sub-sections 5112 are located are alternated and spaced apart with the multiple second through sub-sections 5112 in the second direction Y. With this arrangement, the interval between two adjacent first through sub-sections 5111 is large, and the interval between two adjacent second through sub-sections 5112 is also large. This not only significantly increases the structural strength of the first insulating member 51, but also greatly reduces the possibility of high-temperature gas reigniting on the side of the first insulating member 51 away from the second arc-extinguishing chamber 42, thereby improving the arc-extinguishing effect of the second arc-extinguishing chamber 42.

[0102] In some embodiments, the first through sub-part 5111 and the second through sub-part 5112 are each provided with a first air guide 518 on the third direction Z side, and the air guide directions of the first air guide 518 corresponding to the first through sub-part 5111 and the second through sub-part 5112 are opposite.

[0103] In this embodiment, the first through sub-part 5111 is provided with a first air guide 518 on the side near the second through sub-part 5112, and the second through sub-part 5112 is provided with a first air guide 518 on the side near the first through sub-part 5111.

[0104] In this embodiment, the air guiding direction of both the first air guiding part 518 and the second air guiding part 522 is along the third direction Z.

[0105] If the first gas guide section 518 corresponding to the first through section 5111 and the second through section 5112 is set to have opposite gas guide directions, the high-temperature gas generated by arc extinguishing between adjacent first through section 5111 or adjacent second through section 5112 can be guided along the first gas guide section 518 to the corresponding first through section 511, thereby reducing the accumulation of high-temperature gas.

[0106] Figure 5 This is a schematic diagram of the structure of the second insulating component of the circuit breaker according to an embodiment of this application.

[0107] Please see Figure 5In some embodiments, the anti-breakdown component 5 further includes a second insulating member 52, which abuts against the side of the first arc-extinguishing chamber 41 facing the second arc-extinguishing chamber 42. The second insulating member 52 includes a second body 521 and a second gas guide 522. The second body 521 is provided with a plurality of second through portions 523. At least a portion of the second through portions 523 is located between two adjacent grid plates of the first arc-extinguishing chamber 41 and is used to discharge the gas generated by the first arc-extinguishing chamber 41. The plurality of second gas guide portions 522 are disposed on the side of the second body 521 facing the first arc-extinguishing chamber 41. At least a portion of the second through portions 523 are provided with second gas guide portions 522 on at least one side of the fourth direction A, and the gas between two adjacent grid plates of the first arc-extinguishing chamber 41 is introduced into itself through the second gas guide portions 522. The fourth direction A intersects the first direction X and the arrangement direction of the plurality of grid plates of the first arc-extinguishing chamber 41.

[0108] For example, the second insulating member 52 may abut against the entire side of the first arc-extinguishing chamber 41 facing the second arc-extinguishing chamber 42, or it may abut against the portion of the first arc-extinguishing chamber 41 facing the second arc-extinguishing chamber 42.

[0109] The second insulating element 52 in this embodiment is made of insulating material.

[0110] The fact that at least a portion of the second through section 523 is located between two adjacent grid plates of the first arc-extinguishing chamber 41 does not mean that at least a portion of the second through section 523 is provided between any two adjacent grid plates of the first arc-extinguishing chamber 41.

[0111] The specific structure of the second through portion 523 is not limited in the embodiments of this application. For example, the second through portion 523 is a through hole or a groove.

[0112] The shape of the second air guide 522 is not limited in this embodiment. For example, the second air guide 522 can be a single strip structure or multiple spaced block structures.

[0113] The second air guide portion 522 in this embodiment can be disposed on one side of the second through portion 523 in the fourth direction A, or it can be disposed on opposite sides of the second through portion 523 in the fourth direction A.

[0114] Optionally, the fourth direction A is perpendicular to the arrangement direction of the more than 41 grid plates in the first arc-extinguishing chamber. Further optionally, the first direction X, the arrangement direction of the more than 41 grid plates in the first arc-extinguishing chamber, and the fourth direction A are all perpendicular to each other.

[0115] Optionally, the fourth direction A is parallel to the third direction Z.

[0116] A second gas guide section 522 is provided on the second body 521 to guide the high-temperature gas generated by arc extinguishing between two adjacent grid plates in the first arc extinguishing chamber 41 to the second through section 523, thereby allowing the high-temperature gas to move smoothly to the exhaust port 2, improving exhaust efficiency and reducing the risk of explosion due to poor flow of high-temperature gas.

[0117] Figure 6 This is an exploded view of the second insulating member and side plate of the circuit breaker according to an embodiment of this application. Figure 7 yes Figure 6 The assembly diagram of the second insulating component and the side plate is shown.

[0118] Please see Figure 6 and Figure 7 In some embodiments, the circuit breaker further includes two opposing side plates 64, with the first arc-extinguishing chamber 41 and the second arc-extinguishing chamber 42 mounted on the side plates 64. The second insulating member 52 also includes an end plate 524 disposed on the second body 521. The end plate 524 is disposed at one end of the second body 521 in the direction of the stacking of multiple grid plates of the first arc-extinguishing chamber 41, and the two opposite ends of the end plate 524 along the fourth direction A are respectively engaged with the two side plates 64.

[0119] In this embodiment, the end plate 524 is disposed at one end of the second body 521 away from the stationary contact of the contact system 1, that is, disposed at... Figure 2 The upper part of the middle.

[0120] This application embodiment does not limit the snap-fit ​​method between the end plate 524 and the side plate 64. For example, the end plate 524 has protrusions on both sides, and the side plate 64 has a groove. The protrusions can be snapped into the groove to limit the end plate 524 and the side plate 64 in the first direction X. Optionally, the protrusion has a guide slope for abutting against the side plate 64, allowing the end plate 524 to move to the groove. As another example, the end plate 524 has protrusions on both sides, and the side plate 64 has a through hole. The protrusions can be snapped into the through hole to limit the end plate 524 and the side plate 64 in the first direction X. As yet another example, the end plate 524 has grooves on both sides, and the side plate 64 has protrusions. The protrusions can be snapped into the groove to limit the end plate 524 and the side plate 64 in the first direction X.

[0121] The end plate 524 is snapped into the side plate 64, which means the second insulating component 52 is snapped into the side plate 64, thereby realizing the installation and fixation of the second insulating component 52 and increasing the structural strength of the circuit breaker.

[0122] Figure 8 yes Figure 5 The diagram shows the structure of the second insulating element from another angle.

[0123] Please see Figure 1 , Figure 3 , Figure 5 and Figure 8 In some embodiments, the first arc-extinguishing chamber 41 includes a first end 411 and a second end 412 opposite in the stacking direction, and the second arc-extinguishing chamber 42 includes a third end 421 and a fourth end 422 opposite in the stacking direction. The projection of the first arc-extinguishing chamber 41 along the first direction X onto the fourth end 422, and the projection of the second arc-extinguishing chamber 42 along the first direction X onto the first end 411.

[0124] The second insulating member 52 also includes a gas guide plate 525, which is connected to the second body 521. The gas guide plate 525 includes a fifth end 526 stacked with the first end 411 and a sixth end 527 stacked with the fourth end 422. The gas guide plate 525 guides the gas from the first arc-extinguishing chamber 41 to the exhaust port 2 along the direction from the fifth end 526 to the sixth end 527. The first insulating member 51 extends from the third end 421 to the fourth end 422 and has a limiting protrusion 519 facing the sixth end 527. A limiting groove 528 is formed on the side of the sixth end 527 facing the fourth end 422. The limiting groove 528 is used to accommodate the limiting protrusion 519 and to limit the limiting protrusion 519 in the first direction X.

[0125] In this embodiment, the gas guide plate 525 is roughly Z-shaped, and the middle part of the Z-shaped structure is used to guide the gas in the first arc-extinguishing chamber 41 to the exhaust port 2.

[0126] In actual use, the first insulating member 51 is located above the second insulating member 52. To reduce the risk of the second insulating member 52 falling due to gravity, the first insulating member 51 and the second insulating member 52 are limited in the first direction X by the limiting protrusion 519 and the limiting groove 528, thereby increasing the durability of the circuit breaker.

[0127] In other embodiments, the first insulating member 51 extends from the third end 421 to the fourth end 422 and has a limiting protrusion 519 facing the sixth end 527. A limiting protrusion is formed on the side of the sixth end 527 facing the fourth end 422. The limiting protrusion abuts against the side of the limiting protrusion 519 facing the second arc-extinguishing chamber 42 and provides support for the limiting protrusion 519 in the first direction X.

[0128] This embodiment does not limit the shape of the limiting protrusion; for example, it can be block-shaped or strip-shaped.

[0129] Figure 9 yes Figure 8 The diagram shows a partial structural view of the second insulating element from another angle. Figure 10 This is a schematic diagram of the arc-guiding plate of the circuit breaker according to an embodiment of this application. Figure 11 yes Figure 9 The second insulating element shown and Figure 10 The diagram shows a partial assembly structure of the arc guide plate.

[0130] Please see Figures 9-11 In some embodiments, the arc guide 43 includes a seventh end 431 stacked with the fourth end 422, and the sixth end 527 of the air guide plate 525 forms a slot 529 on the side facing the fourth end 422, and the seventh end 431 of the arc guide 43 can be inserted into the slot 529.

[0131] Optionally, the arc guide 43 includes an end stacked with the first end 411 of the first arc-extinguishing chamber 41 and a seventh end 431 stacked with the fourth end 422, thereby electrically connecting the first arc-extinguishing chamber and the second arc-extinguishing chamber.

[0132] Optionally, the arc guide 43 is fitted to the air guide plate 525.

[0133] The arc guide 43 in this embodiment is made of conductive material.

[0134] In this embodiment of the application, the slot 529 has an opening facing the first arc-extinguishing chamber 41.

[0135] During the arc extinguishing process, the temperature of the arc guide 43 will gradually increase, and thermal deformation will occur. This deformation may manifest as the arc guide 43 bending upward or downward. Therefore, the air guide plate 525 is inserted into the end of the arc guide 43 to reduce the severity of the bending deformation of the arc guide 43.

[0136] Figure 12 This is a schematic diagram of the assembly structure of the first arc-forming component and the second arc-forming component of the circuit breaker according to an embodiment of this application; Figure 13 yes Figure 12 The diagram shows the structure of the first arc-forming component; Figure 14 yes Figure 12 The diagram shows the structure of the second arc-shaped component.

[0137] Please see Figures 12-14 In some embodiments, the circuit breaker further includes two symmetrically arranged first arc-gathering members 71 and two symmetrically arranged second arc-gathering members 72. At least a portion of the first arc-gathering members 71 is disposed between the first arc-extinguishing chamber 41 and the contact system 1. The first arc-gathering member 71 includes a second surface 711 facing each other. A first narrow slit 712 is formed between the two second surfaces 711 of the two first arc-gathering members 71 to allow the arc to move along the first narrow slit 712 to the first arc-extinguishing chamber 41. The first arc-gathering member 71 has a first limiting groove 713 on the side opposite to the second surface 711 in the fourth direction A, which is inserted one by one into at least a portion of the grid plates of the first arc-extinguishing chamber 41. The fourth direction A is perpendicular to the first direction X and the stacking direction of the plurality of grid plates of the first arc-extinguishing chamber 41.

[0138] At least a portion of the second arc-gathering member 72 is disposed between the first arc-extinguishing chamber 41 and the second arc-extinguishing chamber 42. The second arc-gathering member 72 includes a third surface 721 facing each other. A second narrow slit 722 is formed between the two third surfaces 721 of the two second arc-gathering members 72 to allow the electric arc to move along the second narrow slit 722 to the second arc-extinguishing chamber 42. The second arc-gathering member 72 has a second limiting groove 723 on the side opposite to the third surface 721 in the third direction Z, which is inserted into at least a portion of the grid plates of the second arc-extinguishing chamber 42. The third direction Z is perpendicular to the first direction X and the stacking direction of the plurality of grid plates of the second arc-extinguishing chamber 42.

[0139] The first arc-forming element 71 and the second arc-forming element 72 in this embodiment are made of insulating material.

[0140] In this embodiment of the application, the third direction Z and the fourth direction A can be parallel to each other or not parallel.

[0141] The shape of the second surface 711 is not limited in this application embodiment. For example, the second surface 711 can be a plane, a curved surface, or other irregularly shaped surface. The same applies to the third surface 721, which will not be described in detail here.

[0142] Optionally, the dimension of the second arc-gathering member 72 along the second direction Y is the same as the dimension of the second arc-extinguishing chamber 42 along the second direction Y.

[0143] The system is equipped with a first arc-gathering element 71 and a second arc-gathering element 72. Through the arc-gathering effect of these elements, the electric arc can enter the first arc-extinguishing chamber 41 and the second arc-extinguishing chamber 42 along the first narrow slit 712 and the second narrow slit 722 as much as possible, thereby improving the arc-extinguishing capability of the arc-extinguishing system 3. Furthermore, the first arc-gathering element 71 and the second arc-gathering element 72 are respectively provided with multiple first limiting grooves 713 and multiple second limiting grooves 723. The multiple first limiting grooves 713 can limit the grid plates of the first arc-extinguishing chamber 41 in its own stacking direction and in the fourth direction A, while the multiple second limiting grooves 723 can limit the grid plates of the second arc-extinguishing chamber 42 in its own stacking direction and in the third direction Z, reducing the swaying amplitude of the first and second arc-extinguishing chambers 41 and 42. This also allows the electric arc to enter the main body portion of the grid plate with a larger area and be cut by the main body portion, thereby improving the arc-extinguishing effect.

[0144] In some embodiments, the fourth direction A is parallel to the third direction Z. The first arc-gathering member 71 includes a first arc-gathering portion 714 and a second arc-gathering portion 715. The first arc-gathering portion 714 is located between the first arc-extinguishing chamber 41 and the contact system 1. The second arc-gathering portion 715 is located on one side of the first arc-extinguishing chamber 41 in its own grid stacking direction. The end of the second arc-gathering portion 715 facing the second arc-extinguishing chamber 42 has a first stepped surface 716. The end of the second arc-gathering member 72 facing the contact system 1 has a second stepped surface 724. The first stepped surface 716 and the second stepped surface 724 abut against each other to form a limiting position of the first arc-gathering member 71 and the second arc-gathering member 72 in the third direction Z.

[0145] Optionally, the first converging arc portion 714 and the second converging arc portion 715 are integrally formed.

[0146] In this embodiment of the application, the first step surface 716 and the second step surface 724 abut against each other, that is, the first step surface 716 and the second step surface 724 match and fit together.

[0147] Optionally, the stacking direction of the grid plates in the first arc-extinguishing chamber 41 is parallel to the stacking direction of the grid plates in the second arc-extinguishing chamber 42. Further optionally, the length directions of the first step surface 716 and the second step surface 724 are parallel to the stacking direction of the grid plates in the first arc-extinguishing chamber 41.

[0148] The first arc-gathering member 71 and the second arc-gathering member 72 are formed on the third direction Z by the first step surface 716 and the second step surface 724. Since the first arc-gathering member 71 and the second arc-gathering member 72 have the function of limiting the first arc-extinguishing chamber 41 and the second arc-extinguishing chamber 42 respectively, the mutually limiting first arc-gathering member 71 and the second arc-gathering member 72 can limit the shaking of the first arc-extinguishing chamber 41 and the second arc-extinguishing chamber 42, and improve the reliability of the first arc-extinguishing chamber 41 and the second arc-extinguishing chamber 42.

[0149] Figure 15 This is an exploded view of the stationary contact and arc-conducting plate of the circuit breaker according to an embodiment of this application. Figure 16 Figure 15 The diagram shows an assembly schematic of a stationary contact and an arc guide plate. Figure 17 This is another exploded view of the stationary contact and arc-conducting plate of the circuit breaker according to an embodiment of this application. Figure 18 yes Figure 17 The assembly diagram of the stationary contact and the arc guide plate is shown.

[0150] Please see Figure 15 and Figure 16In some embodiments, the contact system 1 includes a stationary contact 11, which is disposed opposite to the second arc-extinguishing chamber 42 in a first direction X. The arc root of the stationary contact 11 can be transferred to the second arc-extinguishing chamber 42. The stationary contact 11 includes a support plate 12, an arc-blocking member 13, and a stationary contact 14. The stationary contact 14 is disposed on the side of the support plate 12 facing the arc-extinguishing assembly 4. The arc-blocking member 13 is attached to the side of the support plate 12 facing the arc-extinguishing assembly 4 and is disposed around the stationary contact 14. The arc-blocking member 13 is used to prevent the arc root of the stationary contact 11 from moving away from the second arc-extinguishing chamber 42.

[0151] In this embodiment, the carrier plate 12 is connected to the conductive busbar 61. Optionally, the carrier plate 12 and the conductive busbar 61 are integrally formed.

[0152] The arc-blocking member 13 in this embodiment is made of insulating material. Optionally, the arc-blocking member 13 is made of insulating paper or plastic sheet.

[0153] In this embodiment, the stationary contact 14 protrudes from the support plate 12. Optionally, the stationary contact 14 has a block structure. More preferably, the stationary contact 14 has a cuboid block structure.

[0154] The arc-blocking member 13 of this application embodiment is disposed around the stationary contact 14, but is not disposed on the side of the stationary contact 14 facing the second arc-extinguishing chamber 42.

[0155] Optionally, the circuit breaker further includes a connecting plate 66 connected between the conductor bar 61 and the support plate 12, with both ends of the connecting plate 66 forming an angle with the conductor bar 61 and the support plate 12, respectively. Further optionally, the conductor bar 61, the connecting plate 66, and the support plate 12 are integrally formed.

[0156] Optionally, the arc-blocking member 13 includes a first sub-part 131 attached to the support plate 12 and a second sub-part 132 attached to the connecting plate 66, the second sub-part 132 being threadedly connected to the connecting plate 66. Further optionally, the first sub-part 131 is bonded to the support plate 12. Further optionally, the second sub-part 132 is bonded to the connecting plate 66.

[0157] Optionally, the circuit breaker also includes an arc guide plate 65, which is disposed on the side of the conductive bus 61 facing the arc extinguishing assembly 4 and electrically connected to the stationary contact 11. The arc guide plate 65 is stacked with the third end 421 of the second arc extinguishing chamber 42 to transfer the arc on the stationary contact 11 to the second arc extinguishing chamber 42.

[0158] Alternatively, the arc guide plate 65, the connecting plate 66, and the arc blocking component 13 are threaded together.

[0159] Please see Figure 17 and Figure 18Optionally, the arc-blocking member 13 includes a first sub-part 131 and a second sub-part 132, two third sub-parts 133 and a fourth sub-part, which are attached to the support plate 12. The first sub-part 131 and the fourth sub-part are arranged opposite each other along the second direction Y. The second sub-part 132 is bent and connected to the first sub-part 131. The two third sub-parts 133 are respectively connected to the two ends of the first sub-part 131 along the third direction Z and are arranged opposite each other. The first sub-part 131, the second sub-part 132, the two third sub-parts 133 and the fourth sub-part form a receiving cavity to cover the support plate 12, the connecting plate 66 and part of the conductive busbar 61.

[0160] During connection, the arc guide plate 65 and the connecting plate 66 can be assembled together with screws first, and then the arc blocking component 13 can be put on. The arc blocking component 13 is set as a cover structure so that the screws are not exposed, thereby increasing the electric creepage distance and improving the safety of the circuit breaker.

[0161] An arc-blocking component 13 is provided on the bearing plate 12 to prevent the arc root of the stationary contact 11 from moving away from the second arc-extinguishing chamber 42, thereby reducing the risk of the arc root burning near the stationary contact 11 and enhancing the arc-extinguishing effect of the circuit breaker.

[0162] Figure 19 This is another structural schematic diagram of the first insulating member of the circuit breaker according to an embodiment of this application; Figure 20 This is another structural schematic diagram of the breakdown protection component of the circuit breaker according to an embodiment of this application.

[0163] Please see Figure 19 and Figure 20 In some embodiments, the first body 512 includes a plurality of first reinforcing plates 5121 arranged sequentially along the third direction Z, with two adjacent first reinforcing plates 5121 disposed opposite each other along the third direction Z, and at least a portion of the first through portion 511 disposed between two adjacent first reinforcing plates 5121.

[0164] Alternatively, the number of first reinforcing plates 5121 is three, the three first reinforcing plates 5121 form two receiving spaces, a plurality of first through sub-parts 5111 are disposed in one of the receiving spaces, and a second through sub-part 5112 is disposed in the other receiving space.

[0165] Multiple first reinforcing plates 5121 are provided on the first body 512 to increase the structural strength of the first body 512 and reduce the possibility of the first body 512 breaking due to the provision of multiple first through parts 511.

[0166] Figure 21 This is a schematic diagram of another structure of the second insulating component of the circuit breaker according to an embodiment of this application.

[0167] Please see Figure 21In some embodiments, the second body 521 includes a plurality of second reinforcing plates 5211 arranged sequentially along the fourth direction A, with two adjacent second reinforcing plates 5211 disposed opposite each other along the fourth direction A, and at least a portion of a plurality of second through portions 523 disposed between two adjacent second reinforcing plates 5211.

[0168] Multiple second reinforcing plates 5211 are provided on the second body 521 to increase the structural strength of the second body 521 and reduce the possibility of the second body 521 breaking due to the provision of multiple second through parts 523.

[0169] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A circuit breaker, comprising a contact system and an exhaust port disposed opposite each other, characterized in that, It also includes an arc-extinguishing system, which comprises: An arc-extinguishing assembly includes a first arc-extinguishing chamber, a second arc-extinguishing chamber, and an arc-guided component. The projections of the first arc-extinguishing chamber and the second arc-extinguishing chamber onto a first plane along a first direction at least partially overlap, and the two can be electrically connected through the arc-guided component. The second arc-extinguishing chamber is located on the side of the first arc-extinguishing chamber away from the contact system. The first direction is parallel to the arrangement direction of the contact system and the exhaust port, and the first plane is perpendicular to the first direction. A breakdown protection assembly includes a first insulating member abutting against the side of a second arc-extinguishing chamber away from the first arc-extinguishing chamber. The first insulating member has multiple first through-parts penetrating itself along a first direction. The first through-parts are used to discharge gas generated by the second arc-extinguishing chamber to the exhaust port. At least a portion of the first through-parts is located between two adjacent grid plates of the second arc-extinguishing chamber. The first insulating member includes a first body and multiple first air guides. The first body has multiple first through-parts. The multiple first air guides are disposed on the side of the first body facing the second arc-extinguishing chamber. At least a portion of the first through-parts have first air guides corresponding to at least one side in a third direction, and the gas between two adjacent grid plates of the second arc-extinguishing chamber is introduced into itself through the first air guides. The third direction intersects the first direction and the arrangement direction of the multiple grid plates of the second arc-extinguishing chamber. The first air guide is a strip structure and has a first air guide surface facing away from the first body. The distance between the first air guide surface and the first body gradually decreases from the end away from the first through-part to the end close to the first through-part.

2. The circuit breaker according to claim 1, characterized in that, The assembly includes a conductive busbar, a terminal block, and a transition plate connecting the conductive busbar and the terminal block. The conductive busbar is opposite to the arc-extinguishing assembly in a second direction, which is parallel to the arrangement direction of the plurality of grid plates in the second arc-extinguishing chamber and intersects with the first direction. The first insulating element includes a first body and a baffle. The first body is provided with a plurality of first through portions. At least a portion of the baffle is disposed on the side of the first body away from the second arc-extinguishing chamber. The baffle extends from the connection between the transition plate and the conductive busbar to the side of the terminal block away from the conductive busbar. A cavity is formed between the plurality of first through portions opposite to the baffle in the first direction and the baffle. The cavity is in communication with the exhaust port.

3. The circuit breaker according to claim 2, characterized in that, The first body includes an isolation section, a first portion, and a second portion. The first portion and the isolation section are arranged along the second direction, and the second portion is connected to the side of the isolation section near the second arc-extinguishing chamber. The second portion is opposite to the baffle in the first direction and extends beyond the end of the baffle away from the conductive busbar in the direction from the conductive busbar to the second arc-extinguishing chamber. At least part of the isolation portion is connected between the baffle and the second portion and divides the cavity into two sub-cavities opposite to each other in a third direction. The two sub-cavities are respectively connected to the exhaust port. The third direction intersects both the first direction and the second direction.

4. The circuit breaker according to claim 3, characterized in that, The end of the baffle away from the conductive busbar has a first surface opposite to the second arc-extinguishing chamber. The first surface, the surface of the first portion away from the second arc-extinguishing chamber, and the surface of the isolation portion away from the second arc-extinguishing chamber are located on the same plane.

5. The circuit breaker according to claim 1, characterized in that, The plurality of first through portions include a plurality of first through sub-ports and a plurality of second through sub-ports. The plurality of first through sub-ports and the plurality of second through sub-ports are arranged at intervals along a second direction projected onto a second plane. The second direction is parallel to the arrangement direction of the plurality of grid plates of the second arc-extinguishing chamber, and the second plane is perpendicular to the second direction. The projections of the plurality of first through sub-parts along the third direction onto the side where the plurality of second through sub-parts are located are alternately and spaced apart from the plurality of second through sub-parts in the second direction; The first through sub-section and the second through sub-section each have a first air guide section on one side of the third direction, and the air guide directions of the first air guide sections corresponding to the first through sub-section and the second through sub-section are opposite.

6. The circuit breaker according to claim 1, characterized in that, The breakdown protection assembly also includes a second insulating element. The second insulating member abuts against the side of the first arc-extinguishing chamber facing the second arc-extinguishing chamber. The second insulating member includes a second body and a second gas guiding portion. The second body has a plurality of second through portions, at least a portion of which is located between two adjacent grid plates of the first arc-extinguishing chamber and is used to discharge the gas generated by the first arc-extinguishing chamber. Multiple second air guides are disposed on the side of the second body facing the first arc-extinguishing chamber. At least a portion of the second through portions are provided with second air guides on at least one side of the fourth direction, and the gas between two adjacent grid plates of the first arc-extinguishing chamber is introduced into itself through the second air guides. The fourth direction intersects the first direction and the arrangement direction of the multiple grid plates of the first arc-extinguishing chamber.

7. The circuit breaker according to claim 6, characterized in that, It also includes two opposing side plates, on which the first arc-extinguishing chamber and the second arc-extinguishing chamber are mounted. The second insulating component further includes an end plate disposed on the second body. The end plate is disposed at one end of the second body in the direction of stacking multiple grid plates in the first arc-extinguishing chamber. The two opposite ends of the end plate along the fourth direction are respectively engaged with the two side plates.

8. The circuit breaker according to claim 6, characterized in that, The first arc-extinguishing chamber includes a first end and a second end opposite to each other in the stacking direction, and the second arc-extinguishing chamber includes a third end and a fourth end opposite to each other in the stacking direction. The projection of the first arc-extinguishing chamber onto the second arc-extinguishing chamber along the first direction covers the fourth end, and the projection of the second arc-extinguishing chamber onto the first arc-extinguishing chamber along the first direction covers the first end. The second insulating component further includes a gas guide plate connected to the second body. The gas guide plate includes a fifth end stacked with the first end and a sixth end stacked with the fourth end. The gas guide plate guides the gas in the first arc-extinguishing chamber to the exhaust port along the direction from the fifth end to the sixth end. The first insulating member extends from the third end to the fourth end and has a limiting protrusion facing the sixth end. A limiting groove is formed on the side of the sixth end facing the fourth end. The limiting groove is used to accommodate the limiting protrusion and limit the limiting protrusion in the first direction.

9. The circuit breaker according to claim 8, characterized in that, The arc guide component includes a seventh end stacked on top of the fourth end. The sixth end of the air guide plate forms a slot on the side facing the fourth end of the second arc extinguishing chamber, and the seventh end of the arc guide component can be inserted into the slot.

10. The circuit breaker according to claim 1, characterized in that, It also includes two first arc-forming components arranged symmetrically and two second arc-forming components arranged symmetrically. At least a portion of the first arc-gathering member is disposed between the first arc-extinguishing chamber and the contact system. The first arc-gathering member includes a second surface facing each other. A first narrow slit is formed between the two second surfaces of the two first arc-gathering members to allow the arc to move along the first narrow slit to the first arc-extinguishing chamber. A first limiting groove is provided on the side of the first arc-gathering member opposite to the second surface in a fourth direction, which is inserted into at least a portion of the grid plates of the first arc-extinguishing chamber. The fourth direction is perpendicular to the first direction and the stacking direction of the plurality of grid plates of the first arc-extinguishing chamber. At least a portion of the second arc-gathering member is disposed between the first arc-extinguishing chamber and the second arc-extinguishing chamber. The second arc-gathering member includes a third surface facing each other. A second narrow slit is formed between the two third surfaces of the two second arc-gathering members to allow the arc to move along the second narrow slit to the second arc-extinguishing chamber. The second arc-gathering member has a second limiting groove on a side opposite to the third surface in a third direction, which is inserted into at least a portion of the grid plates of the second arc-extinguishing chamber. The third direction is perpendicular to the first direction and the stacking direction of the plurality of grid plates of the second arc-extinguishing chamber.

11. The circuit breaker according to claim 10, characterized in that, The fourth direction is parallel to the third direction, and the first arc-forming component includes a first arc-forming portion and a second arc-forming portion. The first arc-gathering part is located between the first arc-extinguishing chamber and the contact system, and the second arc-gathering part is located on one side of the first arc-extinguishing chamber in its own grid lamination direction. The second arc-gathering part has a first stepped surface at the end facing the second arc-extinguishing chamber, and the second arc-gathering member has a second stepped surface at the end facing the contact system. The first stepped surface and the second stepped surface abut against each other to form a limiting position of the first arc-gathering member and the second arc-gathering member in the third direction.

12. The circuit breaker according to claim 1, characterized in that, The contact system includes a stationary contact, which is disposed opposite to the second arc-extinguishing chamber in the first direction. The arc root of the stationary contact can move towards the second arc-extinguishing chamber. The stationary contact includes a support plate, an arc-blocking member, and a stationary contact point. The stationary contact point is disposed on the side of the support plate facing the arc-extinguishing assembly. The arc-blocking member is attached to the side of the support plate facing the arc-extinguishing assembly and is disposed around the stationary contact point. The arc-blocking member is used to prevent the arc root of the stationary contact from moving away from the second arc-extinguishing chamber.

Images