Arc extinguishing mechanism and switch

Abstract

The application provides an arc extinguishing mechanism and a switch, and relates to the technical field of low-voltage electrical apparatuses. The arc extinguishing mechanism comprises an arc extinguishing chamber with an arc inlet. A permanent magnet is rotatably installed on one side of the arc extinguishing chamber close to the arc inlet. The permanent magnet is driven by the magnetic field generated by the conduction current, so that the magnetic field direction of the permanent magnet is consistent with the magnetic field direction generated by the conduction current, thereby effectively cooperating with the magnetic field generated by the current to guide the arc to flow into the arc extinguishing chamber. Through the rotatable installation mode, the permanent magnet can automatically adjust its position according to the change of the conduction current flow direction, thereby being able to adapt to the breaking requirements of forward and reverse currents and being suitable for more extensive application scenarios. Regardless of the forward current or the reverse current, the magnetic field of the permanent magnet can always guide the arc to the arc inlet, ensuring that the arc enters the arc extinguishing chamber in the shortest time, effectively inhibiting the persistence of the arc and avoiding the damage of the equipment and the electrical fault caused by the failure of the arc to be extinguished in time.

Description

Technical Field

[0001] This application relates to the field of low-voltage electrical technology, and more specifically, to an arc-extinguishing mechanism and a switch. Background Technology

[0002] As the core actuator of a circuit control system, the switch plays a crucial role in power transmission and management. It achieves precise switching between on and off states of a circuit through mechanical linkage or electronic control, and is widely used in power distribution, equipment protection, and energy management. The contact assembly, consisting of a fixed stationary contact and a movable moving contact, is responsible for the physical execution of circuit on / off. When the operating mechanism drives the moving contact, the contact pair closes to form a conductive circuit; when they separate, the current path is cut off. This electromechanical conversion characteristic makes it the core component determining the switch's performance.

[0003] During contact breaking, a high-temperature electric arc is generated between the contact surfaces. Traditional methods such as single air blowing or magnetic blowing are insufficient to quickly guide the arc into the arc-extinguishing chamber for extinguishing. To address this issue, existing technologies typically use permanent magnets to provide an external magnetic field, allowing the arc to elongate and rapidly enter the arc-extinguishing chamber. However, limited by the fixed installation method of the permanent magnets, this solution can only effectively guide the arc generated by the breaking of forward current into the arc-extinguishing chamber. When breaking reverse current, the Lorentz force generated by the permanent magnets pulls the arc out of the arc-extinguishing chamber, preventing it from entering and thus hindering effective breaking. This can lead to ablation and damage to the internal structure of the switch. Utility Model Content

[0004] The purpose of this application is to provide an arc-extinguishing mechanism and switch to address the shortcomings of the prior art.

[0005] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0006] In one aspect of this application, an arc extinguishing mechanism is provided, including an arc extinguishing chamber with an arc inlet. A permanent magnet is rotatably mounted on the side of the arc extinguishing chamber near the arc inlet. The permanent magnet is driven by the magnetic field generated by the conducting current so that the direction of the magnetic field of the permanent magnet is consistent with the direction of the magnetic field generated by the conducting current.

[0007] Optionally, a stop protrusion is provided on one side of the permanent magnet. When the permanent magnet rotates to the point where the direction of the magnetic field of the permanent magnet is consistent with the direction of the magnetic field generated by the conducting current, the permanent magnet abuts against the stop protrusion.

[0008] Optionally, at least one stop notch or stop surface is provided on the periphery of the permanent magnet. When the permanent magnet rotates to the point where the direction of the magnetic field of the permanent magnet is consistent with the direction of the magnetic field generated by the conducting current, the stop notch or stop surface abuts against the stop protrusion.

[0009] Optionally, the permanent magnet has a first position and a second position abutting against opposite sides of the stop protrusion, and when the permanent magnet is in the first position and the second position, the direction of the conducting current is opposite.

[0010] Optionally, the permanent magnet is mounted on the side of the arc-extinguishing chamber near the arc inlet via a rotating shaft.

[0011] Optionally, the rotating shaft and the permanent magnet are integrated.

[0012] Optionally, the permanent magnet has a rectangular, rhomboid, elliptical, or circular cross-sectional shape in the direction perpendicular to its rotation axis.

[0013] Optionally, the arc extinguishing mechanism also includes an arc-initiating plate disposed on one side of the arc inlet, the arc-initiating plate having a protrusion that protrudes toward the moving contact of the switch, and a permanent magnet being located on the side of the arc-initiating plate away from the arc inlet.

[0014] Optionally, the arc extinguishing mechanism also includes an arc-starting angle disposed on one side of the arc inlet, the arc-starting angle being used to connect with the stationary contact of the switch, and the permanent magnet being located on the side of the arc-starting angle away from the arc inlet.

[0015] In another aspect of this application, a switch is provided, including a stationary contact, a moving contact, and an arc-extinguishing mechanism of any one of the above. The opening and closing positions of the moving contact and the stationary contact are located on the side of the arc-extinguishing chamber of the arc-extinguishing mechanism near the arc inlet of the arc-extinguishing chamber. The permanent magnet of the arc-extinguishing mechanism is used to guide the arc generated when the moving contact and the stationary contact are opened from the arc inlet into the arc-extinguishing chamber.

[0016] The beneficial effects of this application include:

[0017] This application provides an arc-extinguishing mechanism and switch. The arc-extinguishing mechanism includes an arc-extinguishing chamber with an arc inlet. A permanent magnet is rotatably mounted on the side of the arc-extinguishing chamber near the arc inlet. The permanent magnet is driven by the magnetic field generated by the conducting current, so that the direction of the permanent magnet's magnetic field is aligned with the direction of the magnetic field generated by the conducting current, thereby effectively coordinating the magnetic field generated by the current to guide the arc into the arc-extinguishing chamber. By rotating the permanent magnet, its position can automatically adjust according to changes in the direction of the conducting current, thus adapting to the breaking requirements of both forward and reverse currents and making it suitable for a wider range of applications. Regardless of whether the current is forward or reverse, the magnetic field of the permanent magnet can always guide the arc to the arc inlet, ensuring that the arc enters the arc-extinguishing chamber in the shortest possible time, effectively suppressing the continued existence of the arc, and avoiding equipment damage and electrical faults caused by the inability to extinguish the arc in time. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of an arc-extinguishing mechanism provided in this application embodiment, applied in a switch, with the switch in a closed state;

[0020] Figure 2 A schematic diagram of an arc-extinguishing mechanism provided in this application embodiment, applied in a switch, with the switch in an open state;

[0021] Figure 3 When the permanent magnet is in the first position, Figure 2 AA section view in the middle;

[0022] Figure 4 When the permanent magnet is in the second position, Figure 2 AA section view in the middle;

[0023] Figure 5 This is a schematic diagram of the structure of a permanent magnet in an arc-extinguishing mechanism provided in an embodiment of this application;

[0024] Figure 6 A schematic diagram of the permanent magnet structure of another arc-extinguishing mechanism provided in this application embodiment;

[0025] Figure 7 A schematic diagram of the permanent magnet of another arc-extinguishing mechanism provided in this application embodiment;

[0026] Figure 8 This is a schematic diagram of the permanent magnet structure of another arc-extinguishing mechanism provided in an embodiment of this application.

[0027] Icons: 11-Arc extinguishing chamber; 12-Permanent magnet; 121-Rotating shaft; 122-Shaft hole; 123-Stop notch; 124-Stop surface; 13-Stop protrusion; 14-Arc ignition plate; 141-Protrusion; 15-Arc ignition angle; 2-Housing shell; 3-Stationary contact; 4-Moving contact; 5-First terminal; 6-Second terminal; 7-Conductor. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. It should be noted that, unless otherwise specified, the various features in the embodiments of this application can be combined with each other, and the combined embodiments are still within the protection scope of this application.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They 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. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] DC circuit breakers are critical protection devices specifically designed for DC circuits, widely used in the DC side of solar photovoltaic systems, lithium / lead-acid battery energy storage systems, and DC traction power supply for rail transit. Because DC current lacks the periodic zero-crossing characteristic of AC current, the arc is difficult to extinguish naturally; therefore, enhanced arc-extinguishing capabilities are necessary for reliable interruption. Currently, most solutions use permanent magnets to generate an external magnetic field, utilizing the Lorentz force to elongate the arc generated by the forward current and guide it into the arc-extinguishing chamber for interruption. However, this technology has significant limitations: the fixed installation of the permanent magnet results in an unadjustable magnetic field direction. When interrupting a reverse current, the Lorentz force reverses, pulling the arc away from the arc-extinguishing chamber. This not only fails to effectively extinguish the arc but can also cause contact erosion or equipment damage due to arc escape, becoming a key technical bottleneck restricting the reliability of DC circuit breakers.

[0035] To address the aforementioned problems, one aspect of this application provides an arc-extinguishing mechanism suitable for use in switches, for effectively extinguishing arcs and enhancing switch performance. For example... Figure 1 and Figure 2 As shown, the arc-extinguishing mechanism includes an arc-extinguishing chamber 11 with an arc inlet, and a permanent magnet 12 is rotatably mounted on the side of the arc-extinguishing chamber 11 near the arc inlet. The permanent magnet 12 can rotate in response to the magnetic field generated by the flow of the conducting current inside the switch. Specifically, the arc-extinguishing chamber 11 is fixedly installed inside the switch housing 2, and the permanent magnet 12 is rotatably installed inside the housing 2. When the load terminal connected to the switch is switched with the power supply terminal, the direction of the conducting current in the switch changes, thereby changing the direction of the magnetic field generated by the conducting current. Since the permanent magnet 12 is rotatably installed inside the switch housing 2, it can adapt to the change in the direction of the conducting current. When the direction of the conducting current changes, the permanent magnet 12 will rotate accordingly, aligning its magnetic field direction with the direction of the magnetic field generated by the conducting current inside the switch, and then stopping its rotation.

[0036] When the moving contact 4 and stationary contact 3 of the switch are disconnected, the generation of an electric arc is unavoidable. At this time, due to the rotation of the permanent magnet 12, its magnetic field direction is always consistent with the magnetic field direction generated by the conducting current, thus effectively coordinating with the magnetic field generated by the current to guide the arc into the arc-extinguishing chamber 11. Compared with the traditional method of relying solely on the magnetic field generated by the current to ignite the arc, this technical solution can significantly improve the arc-extinguishing effect through the rotational installation of the permanent magnet 12 and its response to changes in the current direction. The arc guiding efficiency and extinguishing effect can be significantly improved, thereby enhancing the performance of the switch, extending its service life, and improving electrical safety.

[0037] Furthermore, the rotatable installation of the permanent magnet 12 provides greater flexibility to this technical solution. In traditional designs, the permanent magnet 12 is typically fixed, a structure that can only accommodate current flow in one direction. However, this arc-extinguishing mechanism, through its rotatable installation, allows the permanent magnet 12 to automatically adjust its position according to changes in the direction of the conducting current, thus adapting to the interruption requirements of both forward and reverse currents and making it suitable for a wider range of applications. Regardless of whether the current is forward or reverse, the magnetic field of the permanent magnet 12 always guides the arc to the arc inlet, ensuring that the arc enters the arc-extinguishing chamber 11 in the shortest possible time, effectively suppressing the continued existence of the arc and preventing equipment damage and electrical faults caused by the arc's inability to be extinguished in time.

[0038] In summary, this arc-extinguishing mechanism, through the rotational installation of the permanent magnet 12 and its interaction with the magnetic field generated by the current, can not only effectively improve the efficiency of arc guidance and arc extinguishing, but also enhance the switch's adaptability under different conduction current flows, providing greater technical support for the widespread application of the switch.

[0039] Optionally, the permanent magnet 12 is rotatably mounted on the side of the arc-extinguishing chamber 11 near the arc inlet via a rotating shaft 121. Through the flexible application of the rotating shaft 121, the permanent magnet 12 can be automatically adjusted and effectively rotated under different conduction current flows. The rotating shaft 121 can be installed in two different ways as needed to adapt to different design requirements and optimize space and functionality.

[0040] like Figure 5 and Figure 6 As shown, in the first implementation, the rotating shaft 121 and the permanent magnet 12 are fixed together, and the rotating shaft 121 is rotatably mounted inside the housing 2. When the rotating shaft 121 is driven to rotate, the permanent magnet 12 also rotates, thereby realizing the change of the magnetic field direction. The advantage of this method is its simple structure. The fixed connection between the permanent magnet 12 and the rotating shaft 121 ensures that the permanent magnet 12 remains stable during rotation, avoiding any problems caused by loosening or inconsistency. This connection method is very suitable for applications requiring high stability and precision to ensure the accurate rotation and reliability of the permanent magnet 12.

[0041] like Figure 7 and Figure 8As shown, another implementation involves fixing the rotating shaft 121 inside the housing 2 and creating a shaft hole 122 at the center of the permanent magnet 12. The rotating shaft 121 passes through the shaft hole 122, allowing the permanent magnet 12 to rotate around the rotating shaft 121. This design offers greater flexibility, especially effective when adjustments require a smaller space. To ensure smooth rotation of the permanent magnet 12, the dimensions of the shaft hole 122 are precisely matched to the dimensions of the rotating shaft 121, thus preventing wobbling or loosening during rotation. In this way, the rotation of the permanent magnet 12 becomes smoother and more precise, avoiding vibration or instability problems caused by excessive gaps between the shaft hole 122 and the rotating shaft 121. The permanent magnet 12 can quickly respond and adjust its magnetic field direction when the direction of the conducting current changes, thereby ensuring the stability and efficiency of the arc extinguishing process.

[0042] Optionally, such as Figures 5 to 8 As shown, the permanent magnet 12 has a rectangular, square, rhomboid, elliptical, or circular cross-sectional shape in the direction perpendicular to its rotation axis. Different cross-sectional shapes not only provide spatial and design flexibility, but also optimize the interaction between the permanent magnet 12 and the magnetic field generated by the current in practical applications, thereby improving arc extinguishing performance.

[0043] Specifically, the rectangular or square cross-section permanent magnet 12 has a symmetrical geometry, providing a larger contact area and a uniform magnetic field distribution when the direction of the conducting current changes. Furthermore, the rectangular cross-section design facilitates precise installation and adjustment within limited space, making it suitable for the compact arc-extinguishing chamber 11 and achieving a better balance between space and performance. The diagonal structure of the rhomboid cross-section gives it magnetic response capability in different directions, allowing the permanent magnet 12 to couple more effectively with the current magnetic field within a certain angular range. The elliptical cross-section permanent magnet 12, through its streamlined design, exhibits excellent performance in space utilization and rotational smoothness. The elliptical shape not only possesses a certain degree of symmetry, maintaining a uniform magnetic field distribution while effectively reducing friction and resistance during rotation, ensuring smooth rotation of the permanent magnet 12. Moreover, the elliptical shape can be flexibly adjusted, improving the overall adaptability of the equipment. The circular cross-section permanent magnet 12 has the strongest symmetry, exhibiting a very stable and uniform magnetic field response when the direction of the conducting current changes. The circular permanent magnet 12 has good magnetic field distribution characteristics, which can maintain consistency and stability under various current flow conditions, avoid magnetic field fluctuations or interference caused by asymmetry, and ensure the efficiency and stability of the arc extinguishing process.

[0044] By selecting different cross-sectional shapes, the permanent magnet 12 can better adapt to different working environments and design requirements. In situations where space is limited or efficient arc extinguishing is required, the advantages of rectangular, rhomboid, elliptical, and circular shapes allow the equipment to be optimized according to actual needs. For permanent magnets 12 of different shapes, reasonable design selection and adjustment can maximize the interaction between the permanent magnet 12 and the current magnetic field, thereby improving arc extinguishing efficiency and reliability.

[0045] Optionally, such as Figure 1 and Figure 2 As shown, the arc-extinguishing mechanism also includes an arc-initiating plate 14 disposed on the side of the arc inlet. The arc-initiating plate 14 has a protrusion 141 protruding towards the moving contact 4 of the switch to quickly guide the arc generated when the moving contact 4 and the stationary contact 3 are disconnected into the arc-extinguishing chamber 11. The permanent magnet 12 is located on the side of the arc-initiating plate 14 away from the arc inlet and on the side of the protrusion 141 away from the moving contact 4, i.e., at the corner of the back of the arc-initiating plate 14. This enhances the magnetic field strength on the back of the arc-initiating plate 14, especially at the corner, thereby improving the magnetic blow-out effect, effectively weakening the arc formed at this location, and extending the service life of the switch.

[0046] Optionally, such as Figure 1 and Figure 2 As shown, the arc-extinguishing mechanism also includes an arc-initiating angle 15 disposed on one side of the arc inlet. The arc-initiating angle 15 and the arc-initiating plate 14 are respectively disposed on opposite sides of the arc inlet, forming a mutually cooperating structure. This design, through the synergistic effect of the arc-initiating angle 15 and the arc-initiating plate 14, further guides the arc generated when the moving contact 4 and the stationary contact 3 are disconnected into the arc-extinguishing chamber 11, thereby effectively improving the arc-extinguishing efficiency.

[0047] The main function of the arc-starting angle 15 is to connect with the stationary contact 3 of the switch. Through physical contact and magnetic field guidance, it allows the arc to quickly turn and enter the arc-extinguishing chamber 11 when the moving contact 4 is disconnected from the stationary contact 3, enhancing the arc-starting effect. The arc-starting angle 15 not only guides the arc but also works in conjunction with the arc-starting plate 14. The cooperation between the arc-starting plate 14 and the arc-starting angle 15 guides the arc to form a stable arc-starting path, reducing the arc's residence time in the arc-extinguishing chamber 11 and ensuring that the arc is extinguished quickly and efficiently. Through the combined action of the arc-starting angle 15 and the arc-starting plate 14, the initial formation of the arc can be effectively controlled, preventing the arc from persisting for a long time and reducing damage to the switch assembly.

[0048] Furthermore, the permanent magnet 12 is positioned on the side of the arc-starting angle 15 facing away from the arc inlet. By enhancing the magnetic field strength on the back side of the arc-starting angle 15, the magnetic blowout effect can be improved. Through this design, the permanent magnet 12 can generate a strong magnetic force as the arc enters the arc-extinguishing chamber 11, assisting in guiding the arc into the chamber and thus accelerating its extinction. Therefore, the permanent magnet 12 positioned on the back of the arc-starting plate 14 and the permanent magnet 12 on the back of the arc-starting angle 15 can work synergistically to enhance the magnetic field strength on both sides of the arc inlet. This dual magnetic field enhancement design applies a strong magnetic blowout force in the initial stage of the arc entering the arc-extinguishing chamber 11, ensuring that the arc is quickly guided to the chamber. Compared to traditional designs, this dual permanent magnet 12 structure significantly improves the magnetic blowout effect, accelerates the arc extinguishing speed, and prevents the arc from persisting for too long, thereby effectively reducing the damage of the arc to the switch structure and extending the switch's service life.

[0049] Optionally, such as Figures 1 to 4 As shown, in order to effectively control the rotation of the permanent magnet 12 and ensure that it always aligns with the magnetic field generated by the conducting current during the arc extinguishing process, a stop protrusion 13 is provided on one side of the permanent magnet 12. This physical limitation ensures that the permanent magnet 12 will not move excessively due to inertia or external disturbances during rotation. This design provides a precise positioning function for the permanent magnet 12, ensuring that it stops rotating when aligned with the direction of the current magnetic field, thereby avoiding the problem of reduced arc extinguishing efficiency caused by the positional deviation of the permanent magnet 12.

[0050] Specifically, a stop protrusion 13 is provided on the housing 2, located on one side of the permanent magnet 12. The permanent magnet 12, connected to the rotating shaft 121, can rotate freely according to changes in the direction of the conducting current. When the direction of the conducting current changes, the permanent magnet 12 responds to the change in the magnetic field, automatically adjusting its magnetic field direction until it aligns with the magnetic field direction generated by the conducting current in the switch. At this point, the permanent magnet 12 abuts against the stop protrusion 13, stopping further rotation. The stop protrusion 13 not only ensures that the permanent magnet 12 stops in the correct position but also prevents the magnetic field direction from becoming inconsistent due to excessive rotation of the permanent magnet 12. If the permanent magnet 12 fails to stop accurately, its magnetic field direction may become inconsistent with the direction of the conducting current magnetic field, thereby reducing the magnetic blowing force and affecting the arc guidance and extinguishing effect. By limiting excessive rotation of the permanent magnet 12, the stop protrusion 13 ensures that it always aligns with the direction of the conducting current magnetic field, thus improving the efficiency and reliability of the arc extinguishing process.

[0051] Furthermore, it should be understood that the magnetic field direction of the permanent magnet 12 described in this application being consistent with the direction of the current magnetic field means that the two magnetic field directions form an acute angle, and the smaller the acute angle, the better the arc-extinguishing effect of the permanent magnet 12. However, the two magnetic field directions cannot be completely consistent, that is, the angle between the two magnetic field directions cannot be 0. If the angle between the two magnetic field directions is 0, then when a reverse current is applied to the switch, the magnetic force on the permanent magnet 12 will pass exactly through its rotation axis. At this time, the rotational torque is zero, forming an unstable balance, which may cause the permanent magnet 12 to not rotate, and thus it will not have an arc-extinguishing effect. The setting of the stop protrusion 13 can ensure that the permanent magnet 12 stops in the correct position, preventing the permanent magnet 12 from rotating further to be completely consistent with the direction of the current magnetic field, thereby improving the reliability of the arc-extinguishing mechanism.

[0052] Optionally, a stop structure can be provided at the periphery or long axis end of the permanent magnet 12 to ensure that the permanent magnet 12 can be accurately stopped and to prevent excessive rotation due to inertia or other factors from reducing the arc extinguishing effect. Specifically, depending on the shape of the permanent magnet 12, different stop designs can be adopted to ensure the accurate positioning of the permanent magnet 12, thereby optimizing the arc guiding and arc extinguishing effects.

[0053] Specifically, such as Figure 5 and Figure 7 As shown, when the permanent magnet 12 is rectangular or square, one, two, four, or more stop notches 123 are provided on its periphery. The function of these stop notches 123 is that when the magnetic field direction of the permanent magnet 12 is aligned with the magnetic field direction generated by the conducting current, the stop notches 123 contact the stop protrusions 13 and restrict further rotation of the permanent magnet 12. Figure 6 As shown, when the permanent magnet 12 is rhomboid or elliptical, the two ends of its major axis are designed as stop surfaces 124. In this case, the end faces of the major axis of the permanent magnet 12 serve as stop surfaces 124, ensuring that when the permanent magnet 12 rotates to the point where the direction of the magnetic field is consistent with the direction of the magnetic field generated by the current, the end faces of the major axis (i.e., stop surfaces 124) contact the stop protrusions 13, thereby restricting the rotation of the permanent magnet 12.

[0054] This design uses physical constraints to ensure that the permanent magnet 12 does not move excessively due to inertia or other external factors, thus ensuring that the permanent magnet 12 remains aligned with the direction of the current magnetic field. In this way, the permanent magnet 12 can stop at a precise position, thereby enhancing the magnetic blowout effect and ensuring that the electric arc can smoothly enter the arc-extinguishing chamber 11 and be extinguished in a timely manner.

[0055] Optionally, the permanent magnet 12 has a first position and a second position abutting against opposite sides of the stop protrusion 13. When the permanent magnet 12 is in the first position and the second position, the direction of the conducting current is opposite.

[0056] Specifically, the first terminal 5 of the switch is electrically connected to the moving contact 4 via conductor 7, and the second terminal 6 of the switch is electrically connected to the stationary contact 3. The switch can adjust the wiring direction of the first terminal 5 and the second terminal 6, thereby affecting the direction of the magnetic field generated by the conducting current. Figure 3 As shown, when the first terminal 5 is connected to the power supply and the second terminal 6 is connected to the load, the moving contact 4 and the stationary contact 3 are closed, and current flows through the switch. When the magnetic field direction of the permanent magnet 12 in its initial position is inconsistent with the direction of the current, the permanent magnet 12 rotates from its initial position to the first position under the influence of the magnetic field generated by the current, ensuring that the magnetic field direction of the permanent magnet 12 is consistent with the direction of the magnetic field generated by the current. Through this design, the permanent magnet 12 can effectively cooperate with the current magnetic field, enhance the magnetic blow-out effect, and optimize the arc extinguishing process. In subsequent operations, when the switch is repeatedly opening and closing, the permanent magnet 12 always remains in the first position, ensuring the high efficiency and stability of the arc extinguishing process.

[0057] like Figure 4 As shown, when the first terminal 5 is connected to the load terminal and the second terminal 6 is connected to the power supply terminal, the direction of the conducting current changes, causing the direction of the magnetic field generated by the conducting current to reverse. Since the direction of the magnetic field of the permanent magnet 12 in the first position is no longer consistent with the direction of the magnetic field generated by the reverse current, the permanent magnet 12 will be driven to rotate from the first position to the second position. This rotation ensures that the direction of the magnetic field of the permanent magnet 12 in the second position is consistent with the direction of the magnetic field generated by the reverse current, thereby ensuring the smooth progress of the arc extinguishing process.

[0058] In summary, the permanent magnet 12 can automatically adjust its position according to changes in the direction of the conducting current, ensuring that the magnetic field direction of the permanent magnet 12 is always consistent with the magnetic field direction of the conducting current each time the direction of the conducting current changes. This adaptive adjustment enables the switch to maintain stable arc-extinguishing performance under different operating conditions, thereby improving the reliability and service life of the switch.

[0059] Another aspect of the embodiments of this application provides a switch, such as a DC circuit breaker, a transfer switch, etc. Figure 1 and Figure 2 As shown, the switch includes a stationary contact 3, a moving contact 4, and any of the aforementioned arc-extinguishing mechanisms. The opening and closing positions of the moving contact 4 and the stationary contact 3 are located on the side of the arc-extinguishing chamber 11 of the arc-extinguishing mechanism near the arc inlet of the arc-extinguishing chamber 11. The permanent magnet 12 of the arc-extinguishing mechanism is used to guide the arc generated when the moving contact 4 and the stationary contact 3 are opened from the arc inlet into the arc-extinguishing chamber 11. Since the switch uses the aforementioned arc-extinguishing mechanism, it also has the same beneficial effects as the arc-extinguishing mechanism, which will not be described in detail here.

[0060] This application also provides a power distribution device equipped with the aforementioned arc-extinguishing mechanism and / or switch. The power distribution device can be configured with at least one of the following: a distribution box, cable, distribution cabinet, motor, switch socket, lamp, air conditioner, electric water heater, electricity meter, camera, telephone, computer, etc. Such power distribution devices can utilize the arc-extinguishing mechanism and / or switch-related structures of this application to achieve intelligent management, but are not limited to the above-mentioned intelligent management power distribution devices; they can also be used in non-intelligent power distribution devices in traditional industries.

[0061] This application also provides a power distribution device, which applies the aforementioned arc extinguishing mechanism and / or switch to the power distribution device. The power distribution device can be used in smart scenarios, intelligent usage scenarios and the Internet of Things industry to achieve intelligent scenario-based management.

[0062] Optionally, the embodiments of this application can be used for: fire protection power supply: fire control room, fire pump, smoke prevention and exhaust system, fire elevator and its drainage pump, fire emergency lighting, etc. (Level 1); corridor lighting, duty lighting, guard lighting, obstacle marker lights; rail transit; security system power supply; electronic information computer room power supply; passenger elevator power supply; sewage pump; variable frequency speed regulation constant pressure water supply pump (otherwise it is a Level 2 load); main offices, conference rooms, general duty room, archives room.

[0063] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An arc-extinguishing mechanism, characterized in that, The device includes an arc-extinguishing chamber (11) with an arc inlet. A permanent magnet (12) is rotatably mounted on the side of the arc-extinguishing chamber (11) near the arc inlet. The permanent magnet (12) is driven by the magnetic field generated by the conducting current in the switch so that the direction of the magnetic field of the permanent magnet (12) is consistent with the direction of the magnetic field generated by the conducting current.

2. The arc-extinguishing mechanism according to claim 1, characterized in that, A stop protrusion (13) is provided on one side of the permanent magnet (12). When the permanent magnet (12) rotates to the point where the magnetic field direction of the permanent magnet (12) is consistent with the magnetic field direction generated by the conducting current, the permanent magnet (12) abuts against the stop protrusion (13).

3. The arc-extinguishing mechanism according to claim 2, characterized in that, At least one stop notch (123) or stop surface (124) is provided around the periphery of the permanent magnet (12). When the permanent magnet (12) rotates to the point where the magnetic field direction of the permanent magnet (12) is consistent with the magnetic field direction generated by the conducting current, the stop notch (123) or the stop surface (124) abuts against the stop protrusion (13).

4. The arc-extinguishing mechanism according to claim 2 or 3, characterized in that, The permanent magnet (12) has a first position and a second position that abut against the opposite sides of the stop protrusion (13). When the permanent magnet (12) is in the first position and the second position, the direction of the conducting current is opposite.

5. The arc-extinguishing mechanism according to any one of claims 1 to 3, characterized in that, The permanent magnet (12) is rotatably mounted on the side of the arc-extinguishing chamber (11) near the arc inlet via a rotating shaft (121).

6. The arc-extinguishing mechanism according to claim 5, characterized in that, The rotating shaft (121) is integrally formed with the permanent magnet (12).

7. The arc-extinguishing mechanism according to any one of claims 1 to 3, characterized in that, The permanent magnet (12) has a rectangular, rhomboid, elliptical or circular cross-sectional shape in the direction perpendicular to its rotation axis.

8. The arc-extinguishing mechanism according to any one of claims 1 to 3, characterized in that, The arc extinguishing mechanism also includes an arc-initiating plate (14) disposed on one side of the arc inlet. The arc-initiating plate (14) has a protrusion (141) protruding toward the moving contact (4) of the switch. The permanent magnet (12) is located on the side of the arc-initiating plate (14) away from the arc inlet.

9. The arc-extinguishing mechanism according to any one of claims 1 to 3, characterized in that, The arc extinguishing mechanism also includes an arc-starting angle (15) disposed on one side of the arc inlet. The arc-starting angle (15) is used to connect with the stationary contact (3) of the switch. The permanent magnet (12) is located on the side of the arc-starting angle (15) away from the arc inlet.

10. A switch, characterized in that, The device includes a stationary contact (3), a moving contact (4), and an arc-extinguishing mechanism as described in any one of claims 1 to 9. The opening and closing positions of the moving contact (4) and the stationary contact (3) are located on the side of the arc-extinguishing chamber (11) of the arc-extinguishing mechanism near the arc inlet of the arc-extinguishing chamber (11). The permanent magnet (12) of the arc-extinguishing mechanism is used to guide the arc generated when the moving contact (4) and the stationary contact (3) are closed from the arc inlet into the arc-extinguishing chamber (11).

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