Circuit breaker and electrical device

Abstract

The application relates to a circuit breaker and an electrical device, and relates to the technical field of switches. In the circuit breaker, when a baffle is installed at the notch of a first groove, the space of the baffle for accommodating a fuse link and the interior of a bottom shell are isolated, high-pressure gas generated at the fuse link and high-pressure gas generated at a weak area are isolated, and the high-pressure gas of two arc starting parts cannot collide, so that the arc voltage at the weak area is relatively high, and the circuit breaker is suitable for a high-voltage and large-current power loop. When the baffle is removed from the notch of the first groove, the first groove is communicated with the interior of the bottom shell, the high-pressure gas generated at the position of the fuse link collides with the high-pressure gas generated at the weak area in the interior of the bottom shell, at this moment, the arc voltage generated at the position of the weak area is relatively low, the circuit breaker is suitable for a weak-current and precise loop scene provided with sensitive electrical appliances, and the influence of the arc voltage of the circuit breaker on the sensitive electrical appliances in the same loop is reduced or avoided.

Description

Technical Field

[0001] This application relates to the field of switch technology, and more particularly to a circuit breaker and electrical equipment. Background Technology

[0002] Traditional self-driven circuit breakers use a fixed arc-extinguishing structure. After the fused strip melts, the arc is naturally cooled by the arc-extinguishing chamber. The fused strip and the arc-extinguishing chamber are in the same chamber, which makes the arc voltage level uncontrollable during the breaking process. It is impossible to flexibly adjust the arc voltage range according to the application scenario, which affects the breaking performance and the safety of electrical equipment. Summary of the Invention

[0003] This application provides a circuit breaker and electrical equipment. The baffle is detachably installed on the insulating frame. The baffle can be selected based on the actual application scenario to realize the function of flexible configuration of arc voltage control under different working conditions.

[0004] In a first aspect, this application provides a circuit breaker, comprising a piston, a base shell, a conductive busbar, a fused strip, an insulating frame, and a baffle. The piston is mounted on one side of the base shell. The base shell has a first opening. The insulating frame covers the first opening of the base shell and has a first groove, the opening of which faces the interior of the base shell. The insulating frame encloses a portion of the conductive busbar. The conductive busbar includes a first segment and a second segment spaced apart. A portion of the first end and a portion of the second segment are received within the first groove. The first segment has a weak point, and the piston can move towards the base shell to cut off the weak point. The fused strip has a side of the conductive busbar facing the base shell and is received within the first groove, connecting the first segment and the second segment. The baffle is detachably mounted at the opening of the first groove, blocking the opening of the first groove to separate the first groove from the interior of the base shell.

[0005] In the circuit breaker of this application, when a short-circuit fault occurs in the circuit where the circuit breaker is located, the fused strip first ignites an arc, generating an electric arc and high heat and gas in the first groove. After the fused strip ignites, it transmits a signal to cause the circuit breaker to perform a driving action. The piston moves towards the bottom shell and breaks the weak area. At the moment of breaking, an electric arc and high heat and gas are also generated at the weak area, and the arc is carried into the interior of the bottom shell as the piston moves.

[0006] When the baffle is installed at the opening of the first groove, the space where the baffle accommodates the molten strip is isolated from the interior of the bottom shell. When the molten strip arcs and generates high gas pressure, high-pressure gas will also be generated and enter the bottom shell when the piston breaks the weak area. The baffle isolates the high-pressure gas generated at the molten strip and the high-pressure gas generated at the weak area, preventing the high-pressure gas from the two arcing parts from clashing. This reduces or avoids the impact on the internal temperature of the bottom shell, thus facilitating the establishment of the arc voltage at the weak area. This results in a relatively high arc voltage at the weak area, suitable for high-voltage, high-current power circuits, and the arc generated at the weak area can be effectively dissipated within the bottom shell. When the baffle is removed from the opening of the first groove, the first groove connects to the interior of the bottom shell. The high-pressure gas generated at the molten strip location clashes with the high-pressure gas generated at the weak area inside the bottom shell. At this time, the arc voltage generated at the weak area is relatively low, suitable for low-voltage precision circuit scenarios with sensitive electrical appliances, reducing or avoiding the impact of excessive arc voltage of the circuit breaker on sensitive electrical appliances in the same circuit. By detachably installing the baffle on the insulating frame, the baffle can be selected and installed in the circuit breaker according to the actual application scenario of the circuit breaker. By installing or removing the baffle, the arc voltage level in the weak area can be controlled, so as to realize the function of flexibly configuring arc voltage control under different operating conditions.

[0007] In conjunction with the first aspect, in one possible implementation, the baffle is provided with a second groove, the opening of the second groove facing the conductive busbar, the bottom of the second groove blocking the opening of the first groove, at least a portion of the sidewall of the second groove being located within the first groove, and the sidewall of the second groove contacting the sidewall of the first groove.

[0008] This design increases the contact area between the sidewalls of the second and first grooves. Under the same pressure, this effectively increases the friction between the baffle and the sidewall of the first groove, reducing the risk of the baffle falling off. Furthermore, the sidewall of the second groove effectively blocks the impact of high-pressure gas during arc initiation on the sidewall of the first groove, reducing or avoiding the risk of breakage of the insulating frame and ensuring its insulation performance for the conductive busbar.

[0009] In conjunction with the first aspect, in one possible implementation, when the current flowing through the molten strip is greater than or equal to the current threshold, the molten strip melts, and the piston moves toward the bottom shell side and cuts off the weak area.

[0010] By using fused strips as fault sensors, circuit breakers can achieve self-drive without external power supply or complex circuits, thus disconnecting the circuit in which the circuit breaker is located.

[0011] In conjunction with the first aspect, in one possible implementation, the outer peripheral surface of the baffle is provided with a plurality of spaced protrusions, and the inner wall surface of the first groove is provided with a plurality of insertion slots, the plurality of insertion slots corresponding one to one with the plurality of protrusions, and the structure of the insertion slots being such that they can be inserted and engaged with the corresponding protrusions.

[0012] The interlocking of multiple protruding ribs and multiple insertion slots enables the baffle to be fixed in place, effectively limiting the swaying of the baffle and reducing or avoiding the risk of the baffle falling off the insulating frame.

[0013] In conjunction with the first aspect, in one possible implementation, the circuit breaker also includes a flame extinguishing mesh housed within the bottom shell, with a portion of the flame extinguishing mesh positioned opposite to a baffle, and the opposing sides of the baffle contacting the flame extinguishing mesh and the insulating frame, respectively.

[0014] In this way, the flame extinguishing net can support the baffle, effectively preventing the baffle from detaching. In addition, the baffle is positioned so that the flame extinguishing net faces the conductive busbar. When the circuit breaker does not require the baffle to separate the first groove from the interior of the bottom shell, the removal of the baffle will not affect the normal assembly of the flame extinguishing net.

[0015] In conjunction with the first aspect, in one possible implementation, the circuit breaker also includes a support plate housed within a bottom shell, with opposite ends of the support plate contacting the bottom wall of the bottom shell and a baffle, respectively.

[0016] This design ensures that the support plate provides reliable support for the baffle inside the bottom shell, guaranteeing the reliable installation of the baffle and preventing it from falling off the insulating frame under the high voltage of the molten strip arcing, thus achieving reliable isolation between the molten strip and the inside of the bottom shell.

[0017] In conjunction with the first aspect, in one possible implementation, the support plate is provided with multiple through holes for airflow within the bottom shell to pass through the support plate.

[0018] Because the support plate is located inside the bottom shell, and the bottom shell serves as the arc-extinguishing space in the weakest area, it contains a large amount of high-pressure gas. The through holes effectively prevent the support plate from being deformed by the high-pressure gas inside the bottom shell, ensuring reliable support of the baffle. Furthermore, the through holes on the support plate further reduce the impact on the airflow channels inside the bottom shell, ensuring the reliability of arc pressure establishment during arc interruption and extinguishing.

[0019] In conjunction with the first aspect, in one possible implementation, a support plate is arranged around at least a portion of the outer periphery of the flame extinguishing net.

[0020] That is, the support plate forms an open outline in the circumferential direction, which frames at least part of the flame extinguishing net. The support plate does not completely surround the flame extinguishing net, so that the electric arc generated in the weak area can enter the flame extinguishing net and be cooled and deionized by the flame extinguishing net. The support plate surrounds the outer perimeter of the flame extinguishing net, which can reduce the influence of the support plate on the airflow entering the flame extinguishing net.

[0021] In conjunction with the first aspect, in one possible implementation, the circuit breaker also includes an arc-extinguishing element housed within a bottom shell. The arc-extinguishing element forms an arc-extinguishing chamber, which is positioned opposite to the weak area and is connected to the interior of the bottom shell.

[0022] After the piston cuts off the weak area, the electric arc generated in the weak area burns in the arc extinguishing chamber and is converted into high-pressure gas. The arc extinguishing chamber is connected to the interior of the bottom shell. The high-pressure gas generated in the arc extinguishing chamber can also be guided to the interior of the bottom shell under the guidance of the arc extinguishing element to prevent the high-pressure gas from flowing back to the top shell. It is then further cooled and deionized by the flame extinguishing mesh in the bottom shell, accelerating the dissipation of arc energy.

[0023] In conjunction with the first aspect, in one possible implementation, the support plate and the arc-extinguishing component are arranged opposite to each other, and the support plate has a second opening in the circumferential direction, the second opening facing the side of the arc-extinguishing component, and the second opening is connected to the arc-extinguishing chamber.

[0024] This design allows the high-pressure gas in the arc-extinguishing chamber to enter the flame-extinguishing net framed by the support plate without being blocked, thus accelerating the cooling and deionization of the high-pressure gas by the flame-extinguishing net.

[0025] In conjunction with the first aspect, in one possible implementation, the arc extinguishing component is provided with an arc-spraying nozzle, which is arranged opposite to the second opening. The arc-spraying nozzle connects the arc extinguishing chamber and the interior of the bottom shell, and part of the flame extinguishing mesh passes through the second opening and the arc-spraying nozzle and is housed in the arc extinguishing chamber.

[0026] The high-pressure gas in the arc-extinguishing chamber is led from the arc-jet nozzle to the interior of the bottom shell to prevent the high-pressure gas from flowing back to the top shell side, and the high-pressure gas is further cooled and deionized by the flame-extinguishing mesh located outside the arc-extinguishing chamber.

[0027] In a second aspect, this application provides an electrical device comprising a circuit and a circuit breaker as provided in any implementation of the first aspect, the circuit breaker being connected in the circuit and used to disconnect the circuit in the event of a voltage and / or current abnormality. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0029] Figure 1 This is a schematic diagram of the architecture of a photovoltaic system provided in an embodiment of this application; Figure 2 This is a schematic diagram of the architecture of an energy storage system provided in an embodiment of this application; Figure 3 A cross-sectional structural schematic diagram of a circuit breaker from one perspective, provided for an embodiment of this application; Figure 4 for Figure 3Enlarged view of point A in the circuit breaker shown; Figure 5 A cross-sectional structural schematic diagram of a circuit breaker from another perspective, provided for an embodiment of this application; Figure 6 This is a schematic diagram of the structure of the insulating frame, conductive busbar, fused strip, and baffle provided in an embodiment of this application; Figure 7 A cross-sectional structural schematic diagram of another circuit breaker provided in an embodiment of this application; Figure 8 for Figure 7 Enlarged view of point B in the circuit breaker shown; Figure 9 This is a schematic diagram of the structure of a baffle provided in one embodiment of this application; Figure 10 A schematic diagram of the structure of the insulating frame of a circuit breaker provided in an embodiment of this application; Figure 11 A cross-sectional structural schematic diagram of a circuit breaker from another perspective, provided for an embodiment of this application; Figure 12 This is a partial cross-sectional structural diagram of a circuit breaker provided in an embodiment of this application; Figure 13 An exploded view of a support plate, bottom shell, baffle, and flame extinguishing net provided in an embodiment of this application; Figure 14 This is an exploded structural diagram of another support plate, bottom shell, baffle and flame extinguishing net provided in an embodiment of this application.

[0030] Explanation of reference numerals in the attached figures: X - Length direction; Y - Width direction; Z - Height direction; 10 - Top shell; 20 - Piston; 30 - Conductive busbar; 31 - First section; 311 - Weak area; 32 - Second section; 40 - Welded strip; 50 - Insulating frame; 51 - First groove; 52 - Perforation; 53 - Insertion slot; 60 - Bottom shell; 61 - First opening; 70 - Baffle; 71 - Second groove; 72 - Rib; 73 - First side; 74 - Second side; 75 - Third side; 76 - Fourth side; 80 - Mounting base; 81 - First chamber; 82 - Second chamber; 90 - Ignition device; 100 - Circuit board; 200 - Cover; 201 - Cover plate; 2011 - Opening; 202 - Protruding ring; 2021 - Cavity; 300 - Flame extinguishing net; 400 - Support plate; 401 - Through hole; 402 - First side plate; 403 - Second side plate; 404 - Third side plate; 405 - Second opening; 500 - Arc extinguishing component; 501 - Arc extinguishing chamber; 502 - Arc nozzle; 1000 - Disconnector. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0032] The circuit breaker of this application can be applied to electrical systems with high-voltage circuits. The electrical system may include a high-voltage power supply and a load. The circuit breaker, high-voltage power supply, and load are connected in the circuit of the electrical system. One end of the circuit breaker is connected to the high-voltage power supply, and the other end is connected to the load. The circuit breaker is used to disconnect the circuit when an abnormal voltage and / or current occurs. The circuit breaker of this application can also be used in electrical systems or electrical equipment with low-voltage circuits. When the circuit breaker is used in electrical equipment, it is connected in the circuit of the electrical equipment to disconnect the circuit when an abnormal voltage and / or current occurs.

[0033] For example, electrical systems include photovoltaic systems. See also... Figure 1 , Figure 1 This is a schematic diagram of the architecture of a photovoltaic system provided in one embodiment of this application. The photovoltaic system includes a photovoltaic inverter and photovoltaic modules. The photovoltaic inverter is used to convert direct current (DC) from the photovoltaic modules into alternating current (AC).

[0034] The DC input terminal of a photovoltaic inverter is connected to the photovoltaic modules. A photovoltaic inverter includes a DC / AC circuit, which converts direct current (DC) to alternating current (AC).

[0035] In one embodiment, the photovoltaic inverter further includes a Maximum Power Point Tracking (MPPT) module, which tracks the highest voltage and current values ​​to enable the power generation system to output current at maximum power. In other embodiments, the photovoltaic inverter may not include an MPPT module.

[0036] The MPPT module may include a DC / DC circuit for regulating the DC power generated by the photovoltaic module. The regulated DC power can then be supplied to the energy storage system. One end of a DC / AC circuit is connected to both the MPPT module and the energy storage system, while the other end is connected to the grid or load. Thus, the DC / AC circuit converts the DC power output from the MPPT module or energy storage system into AC power, which is then supplied to the grid or load through the AC output of the photovoltaic inverter.

[0037] like Figure 1As shown, in one embodiment, the circuit breaker 1000 provided in this application can be disposed in the circuit between the MPPT module and the energy storage system and the DC / AC circuit. One end of the conductor bar in the circuit breaker 1000 is connected to the MPPT module and the energy storage system, and the other end of the conductor bar is connected to the DC / AC circuit. Specifically, when the circuit breaker 1000 is located inside the photovoltaic inverter, the circuit breaker 1000 is connected between the DC input terminal of the photovoltaic inverter and the DC / AC circuit. In this case, the circuit breaker 1000 operates in the DC circuit. When the current flowing through the conductor bar of the circuit breaker 1000 is greater than or equal to the current threshold, the conductor bar is disconnected to cut off the electrical connection between the MPPT module and the DC / AC circuit, and to cut off the electrical connection between the energy storage system and the DC / AC circuit.

[0038] In another embodiment, the circuit breaker 1000 of this application can be disposed between the DC / AC circuit and the output interface of the photovoltaic system. The circuit breaker 1000 can disconnect the electrical connection between the DC / AC circuit and the power grid / load; that is, one end of the conductor bar in the circuit breaker 1000 is connected to the DC / AC circuit, and the other end of the conductor bar is connected to the power grid / load. Specifically, when the circuit breaker 1000 is located inside the photovoltaic inverter, the circuit breaker 1000 is connected between the DC / AC circuit and the AC output terminal of the photovoltaic inverter. In this case, the circuit breaker 1000 operates in the AC circuit. When the current flowing through the conductor bar of the circuit breaker 1000 is greater than or equal to a current threshold, the conductor bar disconnects to disconnect the electrical connection between the photovoltaic system and the power grid / load.

[0039] For example, the electrical system may include an energy storage system; see [link to relevant documentation]. Figure 2 , Figure 2 This is a schematic diagram of the architecture of an energy storage system provided in one embodiment of this application. Figure 2 As shown, the energy storage system includes electrical equipment, which can be an energy storage device. The energy storage device includes battery modules and a circuit breaker 1000. When the energy storage device is a battery pack, the battery module is a battery assembly composed of multiple batteries; when the energy storage device is an energy storage cabinet, the battery module is a battery cluster composed of multiple battery packs. The circuit breaker 1000 is connected in the series circuit of the battery modules. In one embodiment, the energy storage device includes an input terminal and an output terminal. The input terminal is used to receive DC power output from the photovoltaic system, and the output terminal is used to output DC power to the load. The circuit breaker 1000 provided in this application can be disposed between the input terminal and the battery module. When the current flowing through the conductor of the circuit breaker 1000 is greater than or equal to a current threshold, the conductor is disconnected to cut off the electrical connection between the energy storage device and the photovoltaic system. The circuit breaker 1000 provided in this application can also be disposed between the output terminal and the battery module. When the current flowing through the conductor of the circuit breaker 1000 is greater than or equal to a current threshold, the conductor is disconnected to cut off the electrical connection between the energy storage device and the load.

[0040] In other embodiments, the circuit breaker can also be applied to electrical systems such as electric vehicle charging equipment and data centers. For example, a circuit breaker can be installed in an uninterruptible power supply (UPS) in a data center. The UPS includes a battery and a circuit breaker. The input side of the UPS is connected to the mains power, and the output side of the UPS is connected to the load. The circuit breaker is connected to both the battery and the input side of the UPS, and is used to disconnect the electrical connection between the input side of the UPS and the battery, thereby disconnecting the electrical connection between the UPS and the mains power. Alternatively, the circuit breaker can be connected to both the battery and the output side of the UPS, and is used to disconnect the electrical connection between the output side of the UPS and the battery, thereby disconnecting the electrical connection between the UPS and the load.

[0041] Please see Figure 3 and Figure 4 , Figure 3 This is a cross-sectional structural diagram of a circuit breaker 1000 from one perspective, provided as an embodiment of this application. Figure 4 for Figure 3 The diagram shows an enlarged view of point A in the circuit breaker 1000. The circuit breaker 1000 has a length direction X, a width direction Y, and a height direction Z, as detailed in the attached diagram. The circuit breaker 1000 includes a top shell 10, a piston 20, a conductive busbar 30, a fusible strip 40, an insulating middle frame 50, and a bottom shell 60. The top shell 10 and the bottom shell 60 are arranged opposite to each other. Figure 3 As shown, the top shell 10 and the bottom shell 60 are arranged opposite each other along the height direction Z of the circuit breaker 1000. The bottom of the top shell 10 is open, and the top of the bottom shell 60 has a first opening 61.

[0042] An insulating frame 50 is disposed between the top shell 10 and the bottom shell 60. The insulating frame 50 can simultaneously cover the bottom of the top shell 10 and the first opening 61 of the bottom shell 60 to separate the interior of the top shell 10 and the interior of the bottom shell 60. The insulating frame 50 encloses part of the conductive busbar 30. The insulating frame 50 is provided with a first groove 51, the opening of the first groove 51 facing the interior of the bottom shell 60, and the opening of the first groove 51 is a through-hole connecting the first groove 51 to the interior of the bottom shell 60.

[0043] The piston 20 is installed on one side of the bottom shell 60. Specifically, the piston 20 is housed inside the top shell 10. The piston 20 can move relative to the top shell 10 toward the bottom shell 60. That is, before the piston 20 cuts off the conductive busbar 30, the piston 20 is housed inside the top shell 10 and is located on the side of the conductive busbar 30 away from the bottom shell 60. After the piston 20 cuts off the conductive busbar 30, a part of the piston 20 is located inside the bottom shell 60.

[0044] The conductive busbar 30 includes a first section 31 and a second section 32 spaced apart. A portion of the first section 31 and a portion of the second section 32 are housed within a first groove 51. The first section 31 has a weak area 311, which is positioned opposite the piston 20 in the height direction Z. The dimension of the weak area 311 in the height direction Z is smaller than the dimension of other parts of the first section 31 in the height direction Z. When the piston 20 moves towards the bottom shell 60, it cuts through the weak area 311 to disconnect the circuit containing the breaker 1000. The insulating frame 50 does not cover the weak area 311; that is, there are no insulating frames 50 on opposite sides of the weak area 311 in the height direction Z. This allows the piston 20 to directly face the weak area 311, facilitating rapid cutting of the weak area 311 and ensuring that after cutting through the weak area 311, the piston 20 can fall directly into the bottom shell 60, preventing collision between the insulating frame 50 and the piston 20 and thus avoiding breakage.

[0045] The fusion strip 40 is located on the side of the conductive busbar 30 facing the bottom shell 60. The fusion strip 40 is housed in the first groove 51 and connects the first segment 31 and the second segment 32.

[0046] The circuit breaker 1000 also includes a baffle 70, which is detachably installed at the opening of the first groove 51. The baffle 70 covers the opening of the first groove 51 to separate the first groove 51 from the interior of the bottom shell 60.

[0047] In the circuit breaker 1000 of this application, when a short circuit fault occurs in the circuit where the circuit breaker 1000 is located (i.e., the current flowing through the conductive busbar 30 is greater than or equal to the current threshold), an arc is preferentially ignited at the position of the fused strip 40, generating an electric arc and high heat and gas in the first groove 51. After the fused strip 40 ignites, it transmits a signal to cause the circuit breaker 1000 to perform a driving action. The piston 20 moves towards the bottom shell 60 and breaks the weak area 311. At the moment of breaking, an electric arc, high heat and gas are also generated at the weak area 311, and the electric arc is carried into the interior of the bottom shell 60 as the piston 20 moves.

[0048] When the baffle 70 is installed at the opening of the first groove 51, the space in which the baffle 70 accommodates the molten strip 40 is isolated from the interior of the bottom shell 60. When the molten strip 40 arcs and generates high pressure, high-pressure gas will also be generated and enter the bottom shell 60 when the piston 20 breaks the weak area 311. The baffle 70 isolates the high-pressure gas generated at the molten strip 40 and the high-pressure gas generated at the weak area 311. The high-pressure gas from the two arcing parts will not collide, reducing or avoiding the impact on the internal temperature of the bottom shell 60. This is conducive to the establishment of the arc voltage at the weak area 311, making the arc voltage at the weak area 311 relatively high. This is suitable for high-voltage, high-current power circuits, and the arc generated at the weak area 311 can be effectively dissipated within the bottom shell 60. When the baffle 70 is removed from the opening of the first groove 51, the first groove 51 connects with the interior of the bottom shell 60. The high-pressure gas generated at the molten strip 40 position and the high-pressure gas generated at the weak area 311 counteract each other inside the bottom shell 60. At this time, the arc voltage generated at the weak area 311 position is relatively low, which is suitable for low-voltage precision circuit scenarios with sensitive electrical appliances, reducing or avoiding the impact of excessive arc voltage of the circuit breaker 1000 on sensitive electrical appliances in the same circuit. By detachably installing the baffle 70 on the insulating frame 50, the baffle 70 can be selected and installed in the circuit breaker 1000 based on the actual application scenario of the circuit breaker 1000. By installing or removing the baffle 70, the arc voltage level at the weak area 311 can be controlled, so as to realize the function of flexibly configuring arc voltage control under different operating conditions.

[0049] It should be noted that when the circuit breaker 1000 is used in a low-voltage precision circuit scenario with sensitive electrical appliances, the circuit breaker 1000 without the baffle 70 should be installed in the circuit. If the circuit breaker 1000 has the baffle 70 installed, the baffle 70 can be removed from the first groove 51 before the circuit breaker 1000 is installed in the circuit.

[0050] Please see Figure 5 , Figure 5 This is a cross-sectional view of the circuit breaker 1000 from another perspective, provided as an embodiment of this application. For example, the circuit breaker 1000 further includes a mounting base 80, which is disposed on the side of the insulating frame 50 opposite to the bottom shell 60 and housed inside the top shell 10. The mounting base 80 has a first chamber 81 and a second chamber 82; alternatively, the top shell 10 has a first chamber 81 and a second chamber 82. The first chamber 81 and the second chamber 82 are connected, and the first chamber 81 houses the piston 20. The circuit breaker 1000 also includes an ignition device 90, housed in the second chamber 82. The ignition device 90 is capable of exploding when the current flowing through the conductive busbar 30 is greater than or equal to a current threshold. The high-pressure gas generated during the explosion of the ignition device 90 acts on the piston 20, causing the piston 20 to move towards the bottom shell 60.

[0051] The circuit breaker 1000 also includes a circuit board 100, which is located on the side of the igniter 90 away from the conductive busbar 30 and housed within the top housing 10. The circuit board 100 is connected and fixed to the igniter 90 and electrically connected. The circuit board 100 is a printed circuit board (PCB) and integrates a control circuit that provides a trigger current to the igniter 90. The circuit board 100 is also electrically connected to the conductive busbar 30 to collect the voltage signal of the conductive busbar 30. Specifically, when the current flowing through the fusible link 40 is greater than or equal to the current threshold, the fusible link 40 melts. At this time, the voltage signal collected by the circuit board 100 is greater than or equal to the voltage threshold. The circuit board 100 is used to provide a trigger current to the igniter 90. The trigger current acts on the igniter 90, causing the igniter 90 to generate heat and ignite the gunpowder in the igniter 90, thereby causing the igniter 90 to explode under the trigger current, causing the piston 20 to move towards the bottom housing 60 and cut off the weak area 311. The circuit breaker 1000 has an integrated circuit board 100 and uses a fusible strip 40 as a fault sensor, so that the circuit breaker 1000 can be self-driven without external power supply or complex circuits to disconnect the circuit in which the circuit breaker 1000 is located.

[0052] like Figure 5 As shown, in one embodiment, the first chamber 81 and the second chamber 82 are arranged along the length direction X. This arrangement allows the first chamber 81 to be larger in the height direction Z, providing more space for the piston 20 to adapt to its formation. This enables the piston 20 to quickly and reliably cut through the weak area 311 under the action of the ignition device 90. Specifically, there is a gap between the ignition device 90 and the bottom of the second chamber 82. The side wall of the second chamber 82 has a flow channel connecting the gap and the top of the first chamber 81. The flow channel can be formed by a recess in the side wall of the second chamber 82. Thus, the high-pressure gas generated after the explosion of the ignition device 90 can flow from the gap through the flow channel to the top of the first chamber 81, thereby pushing the top of the piston 20 and causing the piston 20 to move towards the bottom shell 60.

[0053] like Figure 5As shown, in this embodiment, the circuit breaker 1000 further includes a housing 200, which includes a cover plate 201 and a convex ring 202. The cover plate 201 covers the first chamber 81 and the second chamber 82, wherein the cover plate 201 completely covers the top of the first chamber 81 and partially covers the second chamber 82. The cover plate 201 has an opening 2011, which is opposite to and communicates with the second chamber 82. The convex ring 202 is disposed on the side of the cover plate 201 facing the second chamber 82. Specifically, the convex ring 202 is received in the second chamber 82 and spaced apart from the bottom of the second chamber 82 to ensure that the high-pressure gas generated by the explosion of the ignition device 90 can flow from the gap to the flow channel. The convex ring 202 is disposed around the periphery of the opening 2011 to form a cavity 2021 for accommodating the ignition device 90, and the cavity 2021 communicates with the opening 2011 and the second chamber 82. The flow channel is located between the convex ring 202 and the sidewall of the second chamber 82. The cover 200 is made of metal, such as aluminum, steel, or aluminum alloy, and is not specifically limited. The cover 200 separates the ignition device 90 from the sidewall of the second chamber 82. When the ignition device 90 explodes, it can effectively reduce the impact of the high-pressure gas generated by the explosion on the sidewall of the second chamber 82, reducing the risk of cracking of the sidewall of the second chamber 82. At the same time, part of the cover plate 201 is located on the top of the piston 20. When the high-pressure gas in the second chamber 82 enters the first chamber 81, it allows the high-pressure gas to act more effectively on the piston 20, enabling the piston 20 to move rapidly toward the bottom shell 60, striking and cutting the weak area 311.

[0054] In another embodiment, the first and second chambers are arranged along the height direction, with the first chamber closer to the conductive bar than the second chamber. This arrangement allows the high-pressure gas generated after the ignition device explodes in the second chamber to directly impact the piston in the first chamber, enabling the piston to quickly cut through the weak point with lower energy, reducing damage to the piston. Simultaneously, the low energy required for piston movement allows the ignition device to be made smaller and more compact, which helps reduce the overall size of the circuit breaker and lower manufacturing costs.

[0055] Piston 20 is made of a material with high hardness and toughness. Driven by the high-pressure gas generated by the explosion of ignition device 90, piston 20 moves along the side wall of the first chamber 81 toward the weak area 311 and cuts off the weak area 311. A sealing rubber ring is provided between the mating surfaces of piston 20 and the side wall of the first chamber 81 to improve the sealing fit between the two and prevent high-pressure gas in the first chamber 81 from leaking into the bottom shell 60 through the gap between piston 20 and the side wall of the first chamber 81.

[0056] The conductive busbar 30 can be a copper busbar, an aluminum busbar, or a copper-aluminum composite busbar, and there is no specific limitation. The first segment 31 and the second segment 32 of the conductive busbar 30 are both flat plate structures extending along the length direction X, and both the first segment 31 and the second segment 32 are electrically connected to the circuit board 100.

[0057] The fusion tape 40 overlaps the gap between the first segment 31 and the second segment 32 to connect the entire circuit. The fusion tape 40 has a sheet-like structure. For example, the dimension of the fusion tape 40 in the height direction Z is smaller than the dimension of the conductive busbar 30 in the height direction Z. When the current in the circuit where the fusion tape 40 is located is greater than or equal to the current threshold, the fusion tape 40 is easier to melt than the conductive busbar 30.

[0058] In the height direction Z, the orthogonal projection of the fused strip 40 is located on the circuit board 100. That is to say, the gap between the first segment 31 and the second segment 32 is directly opposite the circuit board 100. Since the circuit board 100 needs to collect the voltage signals at the first segment 31 and the second segment 32 near the fused strip 40, the fused strip 40 is set directly opposite the circuit board 100 in the height direction Z. This can effectively shorten the line connecting the first segment 31, the second segment 32 and the circuit board 100, thereby reducing the space occupied by the line in the circuit breaker 1000, which is conducive to the miniaturization design of the circuit breaker 1000.

[0059] Please see Figure 6 , Figure 6 This is a schematic diagram of the structure of the insulating frame 50, conductive busbar 30, fused strip 40, and baffle 70 provided in one embodiment of this application. The insulating frame 50 encloses a portion of the conductive busbar 30, with the enclosed portion of the conductive busbar 30 providing insulation and protection. For example, the insulating frame 50 has a through-hole 52 that penetrates both opposite sides of the insulating frame 50 along the height direction Z, connecting the interior of the first chamber 81 and the bottom shell 60, and accommodating a weak area 311. After the piston 20 cuts through the weak area 311, a portion of the piston 20 is located within the through-hole 52 and adheres to the sidewall of the through-hole 52, while the other portion of the piston 20 passes through the through-hole 52 and extends into the interior of the bottom shell 60.

[0060] The first groove 51 is directly opposite the gap between the first segment 31 and the second segment 32, and directly opposite the molten strip 40 that overlaps at the gap. The first groove 51 and the perforation 52 are arranged at intervals along the length direction X, separating the arc-starting position of the weak area 311 and the arc-starting position of the molten strip 40, so as to avoid the high-pressure gas at the two arc-starting positions directly colliding.

[0061] like Figure 4 As shown, in one embodiment, the baffle 70 has a flat plate structure, and the baffle 70 is snapped onto the side wall of the first groove 51 and blocks the opening of the first groove 51.

[0062] Please see Figure 7 and Figure 8 , Figure 7 This is a cross-sectional structural schematic diagram of another circuit breaker 1000 provided in an embodiment of this application. Figure 8 for Figure 7 The enlarged view of point B in the circuit breaker 1000 is shown. In another embodiment, the baffle 70 is provided with a second groove 71, the opening of the second groove 71 facing the conductive busbar 30, the bottom of the second groove 71 blocking the opening of the first groove 51, at least a portion of the sidewall of the second groove 71 being located within the first groove 51, and the sidewall of the second groove 71 contacting the sidewall of the first groove 51. The second groove 71 is formed on the baffle 70, and the second groove 71 and the first groove 51 together form a chamber for receiving the molten strip 40. The size of this chamber is sufficient to reliably ensure the normal arc ignition of the molten strip 40 and to withstand the instantaneous high air pressure during the arc ignition of the molten strip 40. At least a portion of the sidewall of the second groove 71 is located within the first groove 51. For example, the sidewall of the second groove 71 is completely contained within the first groove 51, increasing the contact area between the sidewalls of the second groove 71 and the first groove 51. Under the same pressure, this effectively increases the friction between the baffle 70 and the sidewall of the first groove 51, reducing the risk of the baffle 70 falling off. Furthermore, the sidewall of the second groove 71 can effectively block the impact of the high-pressure gas during the arc initiation of the molten strip 40 on the sidewall of the first groove 51, reducing or avoiding the risk of the insulating frame 50 breaking and ensuring the insulating protection performance of the insulating frame 50 for the conductive busbar 30.

[0063] Please see Figure 9 and Figure 10 , Figure 9 This is a schematic diagram of the structure of a baffle 70 provided in an embodiment of this application. Figure 10 This is a schematic diagram of the structure of the insulating frame 50 of a circuit breaker 1000 according to an embodiment of this application. Further, the outer peripheral surface of the baffle 70 is provided with a plurality of spaced-apart protrusions 72, and the inner wall surface of the first groove 51 is provided with a plurality of insertion slots 53. Each insertion slot 53 corresponds one-to-one with a protrusion 72, and the insertion slot 53 is configured to interlock with its corresponding protrusion 72. The interlocking of the protrusions 72 and the insertion slots 53 effectively limits and fixes the baffle 70, thereby restricting its swaying and reducing or preventing the risk of the baffle 70 falling off the insulating frame 50.

[0064] The baffle 70 has at least two sides with a plurality of protruding ribs 72 extending in different directions. The at least two sides of the baffle 70 face different directions, and both sides are part of the outer peripheral surface of the baffle 70. For example, the outer peripheral surface of the baffle 70 includes a first side 73, a second side 74, a third side 75, and a fourth side 76 connected sequentially. The first side 73 and the third side 75 are arranged opposite each other along the length direction X, and the second side 74 and the fourth side 76 are arranged opposite each other along the width direction Y. At least two of the first side 73, the second side 74, the third side 75, and the fourth side 76 are each provided with a plurality of protruding ribs 72. Figure 9 As shown, the first side 73, the second side 74, and the fourth side 76 are all provided with multiple protruding ribs 72. The multiple protruding ribs 72 on the first side 73 extend along the length direction X, while the multiple protruding ribs 72 on the second side 74 and the fourth side 76 extend along the width direction Y. By providing multiple protruding ribs 72 on at least two sides of the baffle 70, when the multiple protruding ribs 72 on at least two sides interlock with the insertion grooves 53 on the sidewall of the first groove 51, the friction between the baffle 70 and the sidewall of the first groove 51 can be increased, thereby strengthening the limiting and fixing of the baffle 70 and reducing or avoiding the risk of the baffle 70 falling off the first groove 51.

[0065] For example, the dimensions of the multiple protruding ribs 72 extending outward relative to the outer periphery of the baffle 70 may be inconsistent. For instance, the multiple protruding ribs 72 at the first side 73 extend outward in a longer dimension, while the multiple protruding ribs 72 at the third side 75 and the fourth side 76 extend outward in a shorter dimension. The baffle 70 is limited and fixed by the insertion and cooperation of the multiple protruding ribs 72 of different lengths with the corresponding multiple insertion slots 53.

[0066] Please see Figure 11 , Figure 11 This is a cross-sectional structural schematic diagram of the circuit breaker 1000 from another perspective, provided in an embodiment of this application. The circuit breaker 1000 also includes a flame extinguishing mesh 300, which is housed within the bottom shell 60. A portion of the flame extinguishing mesh 300 is disposed opposite to the baffle 70, that is, the orthographic projection of the baffle 70 along the height direction Z overlaps with the orthographic projection of the flame extinguishing mesh 300 along the height direction Z. The two opposing sides of the baffle 70 contact the flame extinguishing mesh 300 and the insulating frame 50, respectively. Since the insulating frame 50 and the flame extinguishing mesh 300 are disposed opposite to each other along the height direction Z, i.e., the two opposing sides of the baffle 70 along the height direction Z contact the flame extinguishing mesh 300 and the insulating frame 50, the flame extinguishing mesh 300 can thus support the baffle 70, effectively preventing the baffle 70 from detaching. In addition, the baffle 70 is positioned so that the flame extinguishing net 300 faces the conductive bar 30. When the circuit breaker 1000 does not require the baffle 70 to separate the interior of the first groove 51 and the bottom shell 60, the removal of the baffle 70 will not affect the normal assembly of the flame extinguishing net 300.

[0067] The flame extinguishing mesh 300 is made of foamed metal, such as steel wire mesh. Under the magnetic attraction of the flame extinguishing mesh 300, the electric arc is drawn towards it, allowing for rapid cooling and deionization within the mesh. Specifically, when a baffle 70 is installed inside the circuit breaker 1000, the arc generated at the weak point 311 will follow the piston 20 into the bottom shell 60, where it will be cooled, extinguished, and deionized by the flame extinguishing mesh 300. The baffle 70 effectively prevents the high-temperature gas generated by the arc initiation of the molten band 40 from entering the interior of the bottom shell 60, reducing the cooling, extinguishing, and deionization of the arc at the weak point 311 within the flame extinguishing mesh 300. It is understandable that, in the absence of a baffle 70 inside the circuit breaker 1000, the electric arc generated at the molten strip 40 can also be stretched towards the flame extinguishing net 300 under the magnetic attraction of the flame extinguishing net 300, and cooled and extinguished under the action of the flame extinguishing net 300.

[0068] A portion of the flame extinguishing mesh 300 is positioned directly opposite the weak area 311, meaning that the orthographic projection of the flame extinguishing mesh 300 along the height direction Z overlaps with the orthographic projection of the weak area 311 along the height direction Z. Thus, when the piston 20 cuts through the weak area 311, the electric arc generated at the weak area 311 can be quickly cooled and deionized by the flame extinguishing mesh 300, accelerating the dissipation of arc energy and improving the arc extinguishing capability of the circuit breaker 1000. Furthermore, because the flame extinguishing mesh 300 has a certain degree of elasticity, after the piston 20 cuts through the weak area 311, it continues to move into the bottom shell 60 and applies pressure to the flame extinguishing mesh 300, buffering the speed of the piston 20 moving towards the bottom shell 60, reducing the impact force on the piston 20, and thus reducing the risk of piston 20 breakage.

[0069] Please combine them together Figure 12 , Figure 12 This is a partial cross-sectional structural diagram of a circuit breaker 1000 provided in an embodiment of this application. When a baffle 70 is provided inside the circuit breaker 1000, in order to better support the baffle 70 and prevent it from falling off the insulating frame 50, the circuit breaker 1000 also includes a support plate 400. The support plate 400 is housed inside the bottom shell 60. The opposite ends of the support plate 400 contact the bottom wall of the bottom shell 60 and the baffle 70, respectively. That is, in the height direction Z, the support plate 400 is disposed between the baffle 70 and the bottom wall of the bottom shell 60. One end of the support plate 400 in the height direction Z contacts and is fixed to the bottom wall of the bottom shell 60, and the other end of the support plate 400 in the height direction Z contacts the baffle 70. This allows the support plate 400 to provide reliable support for the baffle 70 inside the bottom shell 60, ensuring the reliable installation of the baffle 70 and preventing it from falling off the insulating frame 50 under the high voltage of the fused strip 40 arcing, thus achieving reliable isolation between the fused strip 40 and the inside of the bottom shell 60.

[0070] The support plate 400 is provided with multiple through holes 401, which allow airflow within the base shell 60 to pass through it. Since the support plate 400 is located inside the base shell 60, and the interior of the base shell 60 serves as the arc-extinguishing space for the arc in the weakest area 311, a large amount of high-pressure gas is present within the base shell 60. The through holes 401 effectively prevent the support plate 400 from being deformed by the high-pressure gas within the base shell 60, ensuring reliable support of the baffle 70. Furthermore, the through holes 401 on the support plate 400 further reduce the impact on the airflow channels within the base shell 60, ensuring the reliability of arc pressure establishment during arc interruption and extinguishing.

[0071] Furthermore, the support plate 400 is arranged around at least a portion of the outer periphery of the flame extinguishing net 300. That is, the support plate 400 forms an open outline in the circumferential direction, framing at least a portion of the flame extinguishing net 300. The support plate 400 does not completely surround the flame extinguishing net 300. On the one hand, this allows the electric arc generated in the weak area 311 to enter the flame extinguishing net 300 and be cooled and deionized by the flame extinguishing net 300. The support plate 400 surrounding the outer periphery of the flame extinguishing net 300 reduces the influence of the support plate 400 on the airflow entering the flame extinguishing net 300. On the other hand, the support plate 400 surrounding the outer periphery of the flame extinguishing net 300, that is, the support plate 400 forms corners, making it less likely to tilt under the impact of the airflow inside the bottom shell 60. This ensures reliable support of the baffle 70 by the support plate 400 and effectively prevents the flame extinguishing net 300 from shifting under the impact of the airflow inside the bottom shell 60.

[0072] In addition, the support plate 400 is provided with multiple through holes 401, so that the gas that penetrates the flame extinguishing net 300 can still pass through the support plate 400 which is arranged around the outer periphery of the flame extinguishing net 300 and move toward the gap between the support plate 400 and the side wall of the bottom shell 60, thereby reducing the influence of the support plate 400 on the airflow channel inside the bottom shell 60.

[0073] Please see Figure 13 , Figure 13 This is an exploded structural diagram of a support plate 400, a bottom shell 60, a baffle 70, and a flame extinguishing net 300 provided in an embodiment of this application. The support plate 400 includes at least two side plates, which are connected and fixed together. Both side plates are disposed on the outer periphery of the flame extinguishing net 300. The side plates are bent, and their opposite ends contact the bottom wall of the bottom shell 60 and the baffle 70, respectively, to support the baffle 70.

[0074] Please see Figure 14 , Figure 14This is an exploded structural diagram of another support plate 400, bottom shell 60, baffle 70, and flame extinguishing net 300 provided in an embodiment of this application. For example, a first side plate 402 and a second side plate 403 are connected. The first side plate 402 is bent relative to the second side plate 403. The opposite ends of the first side plate 402 along the height direction Z contact the bottom wall of the bottom shell 60 and the baffle 70, respectively. The opposite ends of the second side plate 403 along the height direction Z also contact the bottom wall of the bottom shell 60 and the baffle 70, respectively. The first side plate 402 can be disposed on one side of the flame extinguishing net 300 along the length direction X, and the second side plate 403 can be disposed on one side of the flame extinguishing net 300 along the width direction Y. In this case, the orthographic projection shape of the support plate 400 along the height direction Z is an "L" shape. Both the first side plate 402 and the second side plate 403 are provided with multiple through holes 401, so that the gas cooled and deionized by the flame extinguishing net 300 can flow from multiple directions.

[0075] like Figure 14 As shown, for example, the support plate 400 includes a first side plate 402, a second side plate 403, and a third side plate 404. The two ends of the first side plate 402 are respectively connected to the second side plate 403 and the third side plate 404, that is, the second side plate 403, the first side plate 402, and the third side plate 404 are connected sequentially. The first side plate 402 is located between the second side plate 403 and the third side plate 404. The two opposite ends of the first side plate 402 along the height direction Z contact the bottom wall of the bottom shell 60 and the baffle 70, respectively. The two opposite ends of plate 403 along the height direction Z contact the bottom wall of the bottom shell 60 and the baffle 70, respectively. The two opposite ends of the third side plate 404 along the height direction Z contact the bottom wall of the bottom shell 60 and the baffle 70, respectively. The first side plate 402 can be set on one side of the flame extinguishing net 300 along the length direction X. The second side plate 403 and the third side plate 404 are respectively set on opposite sides of the flame extinguishing net 300 along the width direction Y. At this time, the orthographic projection shape of the support plate 400 along the height direction Z is a "C" shaped structure. The first side plate 402, the second side plate 403 and the third side plate 404 are all provided with multiple through holes 401, so that the gas cooled and deionized by the flame extinguishing net 300 can flow from multiple directions.

[0076] Both the side of the support plate 400 facing the bottom wall and the side of the support plate 400 facing the baffle 70 are open, which reduces the material used in the support plate 400 and thus lowers manufacturing costs. In other embodiments, the side of the support plate 400 facing the bottom wall has a bottom plate, and / or the side of the support plate 400 facing the baffle 70 has a top plate, with the bottom plate and the top plate connected as one piece by at least two side plates.

[0077] like Figure 14As shown, the support plate 400 has a second opening 405 in the circumferential direction. The second opening 405 is used to allow the high-pressure gas generated at the weak area 311 to enter the flame extinguishing net 300. Since at least part of the flame extinguishing net 300 is framed within the support plate 400, the setting of the second opening 405 allows the high-pressure gas generated at the weak area 311 to enter the flame extinguishing net 300 framed by the support plate 400 without being blocked by the support plate 400, thereby accelerating the cooling and deionization of the high-pressure gas by the flame extinguishing net 300.

[0078] Please return to the reference. Figure 11 The circuit breaker 1000 also includes an arc-extinguishing element 500, which is housed within the bottom shell 60. The arc-extinguishing element 500 forms an arc-extinguishing chamber 501, which is positioned opposite to the weak area 311 and is connected to the interior of the bottom shell 60. After the piston 20 cuts off the weak area 311, the electric arc generated at the weak area 311 burns in the arc-extinguishing chamber 501 and is converted into high-pressure gas. Since the arc-extinguishing chamber 501 is connected to the interior of the bottom shell 60, the high-pressure gas generated in the arc-extinguishing chamber 501 can also be guided to the interior of the bottom shell 60 by the arc-extinguishing element 500, preventing the high-pressure gas from flowing back to the top shell 10. This further cools and deionizes the gas through the flame-extinguishing mesh 300 inside the bottom shell 60, accelerating the dissipation of arc energy.

[0079] After piston 20 cuts off the weak area 311, part of piston 20 is contained in arc-extinguishing chamber 501. Thus, after piston 20 cuts off the weak area 311, the electric arc generated in the weak area 311 forms a high arc pressure through the gap between piston 20 and arc-extinguishing element 500, so that the electric arc can generate high-pressure gas in the gap between piston 20 and side wall of arc-extinguishing chamber 501.

[0080] The arc-extinguishing element 500 is arranged opposite to the support plate 400. For example, the arc-extinguishing element 500 and the support plate 400 are arranged opposite to each other in the length direction X. The second opening 405 of the support plate 400 faces the side of the arc-extinguishing element 500 and is connected to the arc-extinguishing chamber 501. With this arrangement, the high-pressure gas in the arc-extinguishing chamber 501 can enter the flame-extinguishing net 300 framed by the support plate 400 without being blocked by the support plate 400, thereby accelerating the cooling and elimination of free gas by the flame-extinguishing net 300.

[0081] The arc extinguishing component 500 is provided with an arc spraying port 502, which is located on one side of the arc extinguishing component 500 along the length direction X. The arc spraying port 502 connects the arc extinguishing chamber 501 and the interior of the bottom shell 60. After the electric arc is converted into high-pressure gas in the arc extinguishing chamber 501, the high-pressure gas in the arc extinguishing chamber 501 is led from the arc spraying port 502 to the interior of the bottom shell 60 to prevent the high-pressure gas from flowing back to the top shell 10 side.

[0082] Furthermore, a portion of the flame extinguishing mesh 300 passes through the second opening 405 and the arc nozzle 502 and is contained within the arc extinguishing chamber 501. Thus, the portion of the flame extinguishing mesh 300 contained within the arc extinguishing chamber 501 can buffer the piston 20 after cutting off the weak area 311, and provide initial cooling and deionization of the electric arc within the arc extinguishing chamber 501.

[0083] For example, along the height direction Z, the height of the flame extinguishing net 300 at the arc nozzle 502 is less than the height of the arc nozzle 502. In this way, the high-pressure gas in the arc extinguishing chamber 501 can flow to the side of the support plate 400 through the arc nozzle 502 that is not blocked by the flame extinguishing net 300, and the high-pressure gas is further cooled and deionized by the part of the flame extinguishing net 300 located outside the arc extinguishing chamber 501, thereby improving the arc extinguishing performance of the circuit breaker 1000.

[0084] For example, the height of the flame extinguishing mesh 300 housed in the arc extinguishing chamber 501 is greater than the height of the flame extinguishing mesh 300 at the arc nozzle 502. This enhances the buffering effect of the flame extinguishing mesh 300 on the piston 20 in the arc extinguishing chamber 501, reducing or preventing the piston 20 from breaking. At the same time, it also increases the contact area between the electric arc in the arc extinguishing chamber 501 and the flame extinguishing mesh 300, allowing the electric arc to cool down and deionize rapidly.

[0085] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A circuit breaker, characterized in that, Includes piston, bottom shell, conductive busbar, fused strip, insulating middle frame and baffle; The piston is mounted on one side of the bottom shell; The bottom shell has a first opening; The insulating frame covers the first opening of the bottom shell, the insulating frame is provided with a first groove, the opening of the first groove faces the inside of the bottom shell, and the insulating frame encloses part of the conductive bar; The conductive bus includes a first section and a second section spaced apart. A portion of the first section and a portion of the second section are housed in the first groove. The first section has a weak area. The piston can move toward the bottom shell to cut off the weak area. The fused strip is disposed on the side of the conductive busbar facing the bottom shell, the fused strip is received in the first groove, and the fused strip connects the first segment and the second segment; The baffle is detachably installed at the opening of the first groove, and the baffle covers the opening of the first groove to separate the first groove from the interior of the bottom shell.

2. The circuit breaker according to claim 1, characterized in that, The baffle is provided with a second groove, the opening of the second groove faces the conductive busbar, the bottom of the second groove blocks the opening of the first groove, at least a portion of the sidewall of the second groove is located inside the first groove, and the sidewall of the second groove is in contact with the sidewall of the first groove.

3. The circuit breaker according to claim 1 or 2, characterized in that, When the current flowing through the fused strip is greater than or equal to the current threshold, the fused strip melts, and the piston moves toward the bottom shell side and cuts off the weak area.

4. The circuit breaker according to any one of claims 1-3, characterized in that, The outer peripheral surface of the baffle is provided with a plurality of spaced protruding ribs, and the inner wall surface of the first groove is provided with a plurality of insertion slots. The plurality of insertion slots correspond one-to-one with the plurality of protruding ribs, and the structure of the insertion slots is such that they can be inserted and engaged with the corresponding protruding ribs.

5. The circuit breaker according to any one of claims 1-4, characterized in that, The circuit breaker also includes a flame extinguishing mesh, which is housed within the bottom shell. A portion of the flame extinguishing mesh is positioned opposite to the baffle, and the opposing sides of the baffle contact the flame extinguishing mesh and the insulating frame, respectively.

6. The circuit breaker according to claim 5, characterized in that, The circuit breaker also includes a support plate, which is housed within the bottom shell, with its opposite ends contacting the bottom wall of the bottom shell and the baffle, respectively.

7. The circuit breaker according to claim 6, characterized in that, The support plate is provided with multiple through holes, which are used to allow airflow inside the bottom shell to pass through the support plate.

8. The circuit breaker according to claim 6 or 7, characterized in that, The support plate is arranged around at least a portion of the outer periphery of the flame extinguishing net.

9. The circuit breaker according to claim 8, characterized in that, The circuit breaker also includes an arc-extinguishing element housed within the bottom shell. The arc-extinguishing element forms an arc-extinguishing chamber, which is positioned opposite to the weak area and communicates with the interior of the bottom shell.

10. The circuit breaker according to claim 9, characterized in that, The support plate is disposed opposite to the arc extinguishing component. The support plate has a second opening in the circumferential direction, the second opening facing the side of the arc extinguishing component, and the second opening communicating with the arc extinguishing chamber.

11. The circuit breaker according to claim 10, characterized in that, The arc extinguishing component is provided with an arc spraying nozzle, which is positioned opposite to the second opening. The arc spraying nozzle connects the interior of the arc extinguishing chamber and the bottom shell. A portion of the flame extinguishing mesh passes through the second opening and the arc spraying nozzle and is housed within the arc extinguishing chamber.

12. An electrical device, characterized in that, The electrical equipment includes a circuit and a circuit breaker as described in any one of claims 1-11, the circuit breaker being connected in the circuit and used to disconnect the circuit in the event of a voltage and / or current anomaly.

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