Magnetic latching connecting rod mechanism, mechanical isolating switch and hybrid direct-current solid-state circuit breaker

Abstract

The invention discloses a magnetic latching connecting rod mechanism, a mechanical isolation switch and a hybrid direct-current solid-state circuit breaker, and relates to the technical field of low-voltage electric appliances. The magnetic latching connecting rod mechanism comprises a magnetic system and a moving contact assembly; the magnetic system comprises a permanent magnet and a movable iron core, the movable iron core can linearly move between a switching-on position and a switching-off position in the first direction, and when the movable iron core reaches the switching-on position or the switching-off position, magnetic holding is formed through the magnetic force of the permanent magnet; the moving contact assembly comprises a moving contact, and the moving iron core is in linkage with the moving contact assembly, so that the moving contact assembly moves linearly in the second direction intersecting with the first direction, and the moving contact is made to make contact with or be separated from a static contact of the mechanical isolation switch. The magnetic latching connecting rod mechanism can solve the problems of complex structure and high energy consumption of the existing mechanical isolation switch, and realizes the conversion between the driving direction and the contact movement direction at the same time.

Description

Technical Field

[0001] This application relates to the field of low-voltage electrical technology, and more specifically, to a magnetic latching linkage mechanism, a mechanical disconnecting switch, and a hybrid DC solid-state circuit breaker. Background Technology

[0002] Existing solid-state switches paired with mechanical disconnect switches typically have independent drive and holding mechanisms. Specifically, they often employ electromagnetic drive combined with mechanical latching to achieve opening and closing operations and state maintenance. This structure has a large number of components, making assembly and maintenance difficult, and its long-term operational reliability is insufficient. Furthermore, existing drive methods usually require continuous power after closing or opening to maintain the state, resulting in high energy consumption and limited reliability in maintaining the state.

[0003] In terms of movement, the moving contact of existing disconnect switches usually moves in the same direction as the drive mechanism. The stroke of the moving contact is directly limited by the drive stroke, making it difficult to independently optimize contact overtravel and contact pressure, which affects the design flexibility of the contact system. Summary of the Invention

[0004] The purpose of this application is to provide a magnetic latching linkage mechanism, a mechanical disconnecting switch, and a hybrid DC solid-state circuit breaker, which can solve the problems of complex structure and high energy consumption of existing mechanical disconnecting switches, and at the same time realize the conversion between the driving direction and the contact movement direction.

[0005] The embodiments of this application are implemented as follows: A first aspect of this application provides a magnetic holding linkage mechanism, including a magnetic system and a moving contact assembly. The magnetic system includes a permanent magnet and a moving iron core. The moving iron core can move linearly between a closed position and an open position along a first direction, and when it reaches the closed position or the open position, it forms magnetic holding through the magnetic force of the permanent magnet. The moving contact assembly includes a moving contact, and the moving iron core is linked with the moving contact assembly, causing the moving contact assembly to move linearly along a second direction intersecting the first direction, so that the moving contact contacts or separates from the stationary contact of the mechanical disconnector. This magnetic holding linkage mechanism can solve the problems of complex structure and high energy consumption of existing mechanical disconnectors, while realizing the conversion between the driving direction and the contact movement direction.

[0006] As one possible implementation, the magnetic system further includes a coil and a yoke. The moving iron core is linearly movable within the movement area defined by the yoke and is switched between the closed position and the open position by the energization of the coil. The coil includes a closing coil located at the lower part of the yoke and an opening coil located at the upper part of the yoke, and the permanent magnet is located between the closing coil and the opening coil.

[0007] As one possible implementation, it also includes a mechanism support and a connecting rod; the mechanism support is fixedly connected to the moving iron core and can move synchronously with the moving iron core along the first direction; the two ends of the connecting rod are respectively hinged to the mechanism support and the moving contact assembly, and the moving contact assembly can move linearly along the second direction under the drive of the connecting rod.

[0008] In one possible implementation, there are two connecting rods and two moving contact assemblies. The two connecting rods are symmetrically arranged on opposite sides of the mechanism support, and the two connecting rods and two moving contact assemblies are arranged in a one-to-one correspondence.

[0009] As one possible implementation, the first direction is perpendicular to the second direction.

[0010] In one possible implementation, the moving contact assembly includes a contact bracket, a contact fixing bracket, and an elastic element. The contact bracket is connected to the connecting rod, and the contact fixing bracket is disposed opposite to the contact bracket along the second direction. The moving contact is disposed on the contact fixing bracket, and the elastic element is disposed between the contact bracket and the contact fixing bracket. The elastic element is used to provide contact pressure to the moving contact in the closed state.

[0011] As one possible implementation, the moving contact assembly further includes a magnetizing block disposed on opposite sides or one side of the moving contact.

[0012] In one possible implementation, the magnetizing block includes a U-shaped magnetizing block and a plate-shaped magnetizing block, which together cover the outside of the moving contact.

[0013] In one possible implementation, the permanent magnet is a circular ring plate, and the permanent magnet includes a first permanent magnet and a second permanent magnet that are magnetically repulsive. The first permanent magnet and the second permanent magnet are semi-circular ring plates. The permanent magnet is formed by docking the first permanent magnet and the second permanent magnet. The moving iron core can move within the hole of the permanent magnet.

[0014] As one possible implementation, a ring-shaped magnetizing block is provided inside the hole of the permanent magnet; and / or, a fully enclosed magnetizing block with a circular hole inside is provided on the outside of the permanent magnet.

[0015] A second aspect of this application provides a mechanical disconnect switch, including a stationary contact and the aforementioned magnetic holding linkage mechanism, wherein the stationary contact and the moving contact of the magnetic holding linkage mechanism are correspondingly arranged. This magnetic holding linkage mechanism can solve the problems of complex structure and high energy consumption in existing mechanical disconnect switches, while simultaneously enabling the conversion between the driving direction and the contact movement direction.

[0016] A third aspect of this application provides a hybrid DC solid-state circuit breaker, including a solid-state switch and the aforementioned mechanical disconnecting switch connected in parallel with the solid-state switch. This magnetic latching linkage mechanism solves the problems of complex structure and high energy consumption in existing mechanical disconnecting switches, while simultaneously enabling the conversion between the driving direction and the contact movement direction.

[0017] A fourth aspect of this application provides a hybrid DC solid-state circuit breaker, including a solid-state switch and the aforementioned mechanical disconnect switch. The mechanical disconnect switch includes a first mechanical disconnect switch and a second mechanical disconnect switch. The solid-state switch is connected in parallel with the first mechanical disconnect switch, and the second mechanical disconnect switch is connected in parallel in the circuit containing the first mechanical disconnect switch and in series in the circuit containing the solid-state switch. During the switching-on process of the hybrid DC solid-state circuit breaker, the second mechanical disconnect switch, the solid-state switch, and the first mechanical disconnect switch close sequentially, and the solid-state switch opens. During the switching-off process of the hybrid DC solid-state circuit breaker, the solid-state switch closes, and the first mechanical disconnect switch, the solid-state switch, and the second mechanical disconnect switch open sequentially. This magnetic latching linkage mechanism can solve the problems of complex structure and high energy consumption of existing mechanical disconnect switches, while simultaneously realizing the conversion between the driving direction and the contact movement direction.

[0018] The beneficial effects of the embodiments of this application include: This application establishes a magnetic system comprising a permanent magnet and a moving iron core. When the moving iron core reaches the closed or open position, it is magnetically held in place by the magnetic force of the permanent magnet, maintaining its current state without continuous energization, thus significantly reducing system energy consumption. Simultaneously, it eliminates the need for a complex mechanical locking structure, reducing the number of parts, lowering structural complexity, and improving long-term operational reliability. Furthermore, this application links the moving iron core with the moving contact assembly, converting the linear motion of the moving iron core along a first direction into linear motion of the moving contact assembly along a second direction intersecting the first direction. This conversion between the driving direction and the contact motion direction allows the moving contact stroke to be independent of the driving stroke, facilitating independent optimization of contact stroke, overtravel, and pressure distribution according to electrical performance requirements. Attached Figure Description

[0019] 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.

[0020] Figure 1 This is a schematic diagram of the magnetic holding linkage mechanism provided in the embodiments of this application; Figure 2An exploded view of the magnetic holding linkage mechanism provided in the embodiments of this application; Figure 3 for Figure 2 A magnified view of a portion of the image; Figure 4 This is an exploded schematic diagram of a magnetic system provided in an embodiment of this application; Figure 5 This is a schematic diagram of the moving contact assembly and stationary contact provided in an embodiment of this application.

[0021] Icons: 100-Magnetic holding linkage mechanism; 10-Magnetic system; 11-Permanent magnet; 111-First permanent magnet; 112-Second permanent magnet; 12-Moving iron core; 13-Coil; 131-Closing coil; 132-Opening coil; 133-Coil frame; 14-Magnetic yoke; 15-Annular magnetizing block; 16-Fully enclosed magnetizing block; 20-Mechanism support; 30-Linkage; 40-Moving contact assembly; 41-Moving contact; 42-Elastic element; 43-Contact support; 44-Contact fixing support; 45-Magnetic block; 451-U-shaped magnetizing block; 452-Plate magnetizing block; 200-Stationary contact. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only some embodiments of this application, not all embodiments. Similar reference numerals and letters in the following drawings indicate similar items. Once an item is defined in one drawing, it does not need to be further defined in other drawings.

[0023] 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 is in use. They are used only for the convenience of describing this application and should not be construed as limiting this application. The terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to connections within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] Existing solid-state switches paired with mechanical disconnectors typically have independently configured drive and holding mechanisms. Specifically, they often employ electromagnetic drive combined with mechanical latching to achieve opening and closing operations and state maintenance. This structure has a large number of components, making assembly and maintenance difficult, and its long-term operational reliability is insufficient. Furthermore, existing drive methods usually require continuous energization after closing or opening to maintain the state, resulting in high energy consumption and limited reliability in maintaining the state. Regarding motion, the moving contact of existing disconnectors typically moves in the same direction as the drive mechanism, and the moving contact stroke is directly limited by the drive stroke. This makes it difficult to independently optimize contact overtravel and contact pressure, affecting the design flexibility of the contact system.

[0026] To solve the above problems, please refer to the following: Figures 1 to 5 This application provides a magnetic holding linkage mechanism 100, including a magnetic system 10 and a moving contact assembly 40. The magnetic system 10 includes a permanent magnet 11 and a moving iron core 12. The moving iron core 12 can move linearly between a closed position and an open position along a first direction, and forms magnetic holding through the magnetic force of the permanent magnet 11 when it reaches the closed or open position. The moving contact assembly 40 includes a moving contact 41. The moving iron core 12 is linked with the moving contact assembly 40, so that the moving contact assembly 40 moves linearly along a second direction intersecting the first direction, so that the moving contact 41 contacts or separates from the stationary contact 200 of the mechanical disconnector. This magnetic holding linkage mechanism 100 achieves self-holding through the magnetic system 10, eliminating the need for a mechanical locking structure, and simultaneously realizes the conversion between the driving direction and the contact movement direction.

[0027] It should be noted that this application integrates the magnetic system 10 with the moving contact assembly 40 to form an integrated drive and execution structure. The magnetic system 10 is fixed to the mounting base and serves as the power input and position holding unit for the entire mechanism, without moving in the second direction with the moving contact assembly 40. The moving contact assembly 40, as the execution end, achieves contact, clamping, and separation actions with the stationary contact 200 under the push of the moving iron core 12. The magnetic system 10 provides driving force and permanent magnet holding force, and the linear motion of the moving iron core 12 in the first direction is converted into the linear motion of the moving contact 41 in the second direction, realizing the conversion between the driving direction and the contact motion direction, which facilitates independent optimization of stroke and pressure. The overall structure is simple, requires no mechanical locking or continuous power supply, and has high reliability and low energy consumption.

[0028] In summary, this application, by setting up a magnetic system 10 including a permanent magnet 11 and a moving iron core 12, allows the moving iron core 12 to maintain its current state by magnetic force from the permanent magnet 11 when it reaches the closed or open position, without the need for continuous power supply, thus significantly reducing system energy consumption. Simultaneously, it eliminates the need for a complex mechanical locking structure, reducing the number of parts, lowering structural complexity, and improving long-term operational reliability. Furthermore, this application, through the linkage between the moving iron core and the moving contact assembly 40, converts the linear motion of the moving iron core 12 along the first direction into the linear motion of the moving contact assembly 40 along a second direction intersecting the first direction. This conversion between the driving direction and the contact motion direction allows the stroke of the moving contact 41 to be unrestricted by the driving stroke, facilitating independent optimization of contact stroke, overtravel, and pressure distribution according to electrical performance requirements.

[0029] As one possible implementation, the magnetic system 10 can adopt a single permanent magnet 11 structure, with the permanent magnet 11 fixedly disposed at at least one end in the closed or open position to provide magnetic holding force when the moving iron core 12 reaches the corresponding position.

[0030] It should be noted that the permanent magnet 11 can be embedded inside the magnetic yoke 14 and arranged near the moving end point of the moving iron core 12. When the moving iron core 12 moves to the closed or open position, a closed magnetic circuit is formed between the permanent magnet 11 and the moving iron core 12, generating a stable magnetic attraction force to attract and fix the moving iron core 12, so that the moving iron core 12 will not move on its own without the action of external force, thus realizing a reliable power-off retention function.

[0031] As one possible implementation method, such as Figure 1 and Figure 2 , Figure 4 As shown, the magnetic system 10 also includes a coil 13 and a yoke 14. The moving iron core 12 is linearly movable within the movement area defined by the yoke 14. Specifically, the coil 13 includes a closing coil 131 located at the lower part of the yoke 14 and a opening coil 132 located at the upper part of the yoke 14. The closing coil 131 and the opening coil 132 each include an I-shaped coil frame 133, which is fixed to the yoke 14. Figure 4 The coil 13 shown only includes the coil frame 133 of the closing coil 131 and the opening coil 132. The moving iron core 12 can move linearly within the coil frame 133 of the coil 13 and is switched between the closing and opening positions by the energization of the coil 13. The permanent magnet 11 is located between the closing coil 131 and the opening coil 132. In the opening state, the moving iron core 12 is located in the opening coil 132. When closing, the closing coil 131 is energized, attracting the moving iron core 12 into the closing coil 131, so that the moving iron core 12 reaches the closing position. When opening, the opening coil 132 is energized, attracting the moving iron core 12 into the opening coil 132, so that the moving iron core 12 reaches the opening position.

[0032] It should be noted that coil 13 and yoke 14 form a magnetic circuit. When coil 13 is energized, it generates an electromagnetic driving force, propelling the moving iron core 12 to move linearly along the first direction. The closing coil 131 and opening coil 132 are only briefly energized during the opening or closing action, and de-energized after the action is completed, not participating in state maintenance. After the moving iron core 12 moves to the closing or opening position, it is fixed by the magnetic force provided by permanent magnet 11, achieving power-free magnetic holding. The closing coil 131 and opening coil 132 are only briefly energized during switching actions, eliminating the need for long-term excitation and effectively reducing energy consumption. The yoke 14 provides guidance and limitation for the moving iron core 12, restricting its movement to linear motion only along the first direction, preventing radial swaying or deviation, and ensuring smooth and reliable movement.

[0033] As one possible implementation method, such as Figure 4 As shown, the permanent magnet 11 is a circular ring plate, comprising a first permanent magnet 111 and a second permanent magnet 112. The first and second permanent magnets 111 and 112 are semi-circular ring plates, which, when joined together, form a circular ring plate. The moving iron core 12 can move through the hole in the circular ring plate. The first and second permanent magnets 111 and 112 are magnetically repulsive, and the moving iron core 12 experiences a bidirectional magnetic force from both. When the moving iron core 12 is positioned within the hole formed by the first and second permanent magnets 111 and 112, it experiences no force, achieving force balance. When the moving iron core 12 deviates from the first and second permanent magnets 111 and 112, it experiences a magnetic force pushing it to the side it deviates from, thus being pushed to one side by the magnetic force. After joining, the end faces of the semi-circular ring plates are in direct contact or have a gap that does not excessively reduce the magnetic force.

[0034] When the circuit is closed, the moving iron core 12 moves towards the lower part of the magnetic yoke 14. After closing, it is positioned and held in the closed position by the magnetic force of the permanent magnet 11. When the circuit is opened, the moving iron core 12 moves towards the upper part of the magnetic yoke 14. After opening, it is positioned and held in the open position by the magnetic force of the permanent magnet 11.

[0035] Furthermore, such as Figure 4 As shown, a ring-shaped magnetizing block 15 can be added into the hole of the permanent magnet 11, and / or, a fully enclosed magnetizing block 16 with a circular hole inside (e.g., a rectangular magnetizing block or a circular magnetizing block with a circular hole inside) can be added to the outside of the permanent magnet 11 to increase the thrust of the permanent magnet 11 on the moving iron core 12.

[0036] As one possible implementation, the magnetic holding linkage mechanism further includes a mechanism support 20 and a connecting rod 30; the mechanism support 20 is fixedly connected to the moving iron core 12 and can move synchronously with the moving iron core 12 along the first direction; the two ends of the connecting rod 30 are respectively hinged to the mechanism support 20 and the moving contact assembly 40, and the moving contact assembly 40 can move linearly along the second direction under the drive of the connecting rod 30.

[0037] It should be noted that in the above transmission structure, the mechanism support 20, as an intermediate transmission carrier, is rigidly connected to the moving iron core 12, enabling the complete and synchronous transmission of the linear motion of the moving iron core 12 to the connecting rod 30. The connecting rod 30, as a motion conversion component, converts the linear driving displacement in the first direction into the contact opening and closing displacement in the second direction. In this way, an integrated structure of driving, transmission, and execution can be formed, transmitting the driving force of the moving iron core 12 to the moving contact assembly 40 through the mechanism support 20 and the connecting rod 30, and realizing the conversion between the driving direction and the contact motion direction.

[0038] As one possible implementation method, such as Figure 1 and Figure 2 As shown, there are two connecting rods 30 and two moving contact assemblies 40. The two connecting rods 30 are symmetrically arranged on opposite sides of the mechanism support 20, and the two connecting rods 30 and the two moving contact assemblies 40 are arranged in a one-to-one correspondence.

[0039] It should be noted that when the mechanism support 20 moves, it simultaneously drives the two sets of moving contact assemblies 40 to move synchronously through the symmetrically arranged connecting rods 30 on both sides. The travel of the connecting rods 30 on both sides is completely consistent, and the transmission angle and force state are symmetrical and balanced, ensuring the consistency of the movement of the contacts on both sides, improving the synchronization of opening and closing and the structural force balance. The symmetrical structure can reduce lateral forces and uneven wear, avoid jamming, skewing or excessive wear caused by excessive force on one side, and improve the overall service life and operational stability of the mechanism.

[0040] As one possible implementation method, such as Figure 1 and Figure 2 As shown, the connecting rod 30 can be configured as a single connecting rod 30 or a double connecting rod 30, and the length of the connecting rod 30 is set according to the transmission ratio between the stroke of the moving iron core 12 and the stroke of the moving contact 41.

[0041] It should be noted that by adjusting the length of the connecting rod 30 and the position of the hinge point, the proportional relationship between the drive stroke and the contact stroke can be changed. Thus, without changing the stroke of the magnetic system 10, the moving distance and overtravel of the moving contact 41 can be flexibly adjusted, further improving the flexibility of the mechanism design.

[0042] As one possible implementation method, such as Figure 1 and Figure 2 As shown, the two ends of the connecting rod 30 are hinged to the mechanism support 20 and the moving contact assembly 40, respectively.

[0043] It should be noted that one end of the connecting rod 30 is hinged to the mechanism support 20, and the other end is hinged to the moving contact assembly 40. The hinge point can rotate freely to adapt to the continuous change of the angle of the connecting rod 30 during the movement. When the moving iron core 12 drives the mechanism support 20 to move, the connecting rod 30 rotates and changes angle with the displacement of the mechanism support 20, converting the linear driving force into a thrust that pushes the moving contact assembly 40 to move in the second direction. The hinge structure can reduce motion jamming and improve transmission efficiency and smoothness of operation.

[0044] As one possible implementation method, such as Figure 1 and Figure 2 As shown, the first direction is perpendicular to the second direction.

[0045] It should be noted that the moving iron core 12 reciprocates linearly along the first direction, and the moving contact assembly 40 moves along the second direction perpendicular to the first direction. The vertical movement is converted through the connecting rod 30, so that the drive stroke and the contact stroke are converted. The drive mechanism and the contact system are independent of each other in spatial layout and can be optimized separately. This makes it easy to optimize the stroke of the moving iron core 12 and the overtravel of the moving contact 41 separately, and improves the design freedom of the contact system.

[0046] As another possible implementation method, the first direction and the second direction can be set to a non-perpendicular oblique angle to adapt to the internal space layout requirements of different products.

[0047] It should be noted that the angle between the first and second directions can be set to acute or obtuse depending on the housing space, insulation distance, and assembly requirements. The connecting rod 30 structure can adaptively adjust the angle and hinge position, still achieving the conversion between the driving direction and the contact movement direction, thus broadening the applicable scenarios of the mechanism.

[0048] As one possible implementation method, such as Figures 1 to 3 As shown, the moving contact assembly 40 includes a contact bracket 43, a contact fixing bracket 44, and an elastic element 42. The contact bracket 43 is connected to the connecting rod 30. The contact fixing bracket 44 and the contact bracket 43 are arranged opposite to each other in the second direction. The moving contact 41 is disposed on the contact fixing bracket 44. The elastic element 42 is disposed between the contact bracket 43 and the contact fixing bracket 44. The elastic element 42 is used to provide contact pressure to the moving contact 41 in the closed state.

[0049] It should be noted that the contact support 43 receives the thrust transmitted by the connecting rod 30 and moves in the second direction. One end of the elastic element 42 abuts against the contact support 43, and the other end abuts against the contact fixing support 44. After the moving contact 41 is closed, it no longer moves with the mechanism support 20, while the elastic element 42 can continue to be compressed to build up pressure, realizing the independent design of contact stroke and contact pressure. The elastic element 42 is provided in the moving contact assembly 40, which can continuously provide contact pressure to the moving contact 41 after closing. The elastic element 42 can compensate for wear and assembly errors, ensure reliable electrical contact between the moving contact 41 and the stationary contact 200, reduce contact resistance, and improve current flow stability and service life. The closing process is divided into a contact stage and a pressure build-up stage: During the closing process, the contact support 43 pushes the elastic element 42 and the contact fixing support 44 to move, so that the moving contact 41 contacts the stationary contact 200; after the contact is in place, the contact support 43 continues to move to compress the elastic element 42, which provides continuous contact pressure to achieve wear compensation and stable pressure output. The compression amount of the elastic element 42 is independent of the contact stroke and can be designed separately to meet the contact pressure requirements.

[0050] As one possible implementation method, such as Figures 1 to 3 As shown, the elastic element 42 can be a cylindrical spring, disc spring, rectangular spring, or elastic conductive sheet to provide stable and adjustable contact pressure.

[0051] It should be noted that different types of elastic elements 42 can be adapted to contact structures with different rated currents and different spatial heights. The contact pressure can be adjusted by replacing the elastic element 42 without changing the parameters of the connecting rod 30 and the magnetic system 10, thereby improving the versatility and serialization expansion capability of the mechanism.

[0052] As one possible implementation method, such as Figures 1 to 3 As shown, the moving contact assembly 40 also includes a magnetizing block 45, which is disposed on opposite sides or one side of the moving contact 41.

[0053] It should be noted that in this embodiment, the magnetizing blocks 45 are arranged on both sides of the moving contact 41, which can concentrate the leakage magnetic field in the contact area, optimize the magnetic field distribution around the current path, and generate a unidirectional electromagnetic force when a short-circuit current passes through, increasing the contact pressure between the moving contact 41 and the stationary contact 200, improving electric stability, and avoiding welding or ablation caused by contact repulsion under high current conditions. Alternatively, in other embodiments, the magnetizing blocks 45 can also be arranged only on one side of the moving contact 41. The single-sided magnetizing blocks 45 can also concentrate the leakage magnetic field in the contact area to a certain extent and optimize the magnetic field distribution around the current path; when a short-circuit current passes through, the electromagnetic force generated by the magnetizing blocks 45 can still act on the moving contact 41, which helps to increase the contact pressure between the moving contact 41 and the stationary contact 200, improve electric stability, and to a certain extent avoid welding or ablation caused by contact repulsion under high current conditions. Compared with double-sided arrangement, single-sided arrangement has better adaptability in space-constrained situations.

[0054] As one possible implementation method, such as Figure 3 As shown, the magnetizing block 45 includes a U-shaped magnetizing block 451 and a plate-shaped magnetizing block 452, which together cover the outside of the moving contact 41.

[0055] It should be noted that the U-shaped magnetizing block 451 and the plate-shaped magnetizing block 452 work together to wrap the moving contact 41 from multiple directions, forming a magnetizing circuit with higher closure and lower magnetic resistance, thus forming a complete magnetizing circuit. This further enhances the short-circuit current limiting and contact pressure self-reinforcing effect, and improves the circuit breaker's withstand capability and breaking reliability under fault current.

[0056] This application embodiment also provides a mechanical disconnecting switch, including a stationary contact 200 and the aforementioned magnetic holding linkage mechanism 100. The stationary contact 200 and the moving contact 41 of the magnetic holding linkage mechanism 100 are correspondingly arranged. The magnetic holding linkage mechanism 100 drives the moving contact 41 to approach or move away from the stationary contact 200, realizing the closing conduction and opening disconnection. After closing, the closed state is maintained by magnetic holding; after opening, the open isolation state is maintained by magnetic holding. It has a simple structure, reliable maintenance, and low energy consumption, and is suitable for isolation protection of high voltage DC systems.

[0057] This application also provides a hybrid DC solid-state circuit breaker, including a solid-state switch and the aforementioned mechanical disconnecting switch connected in parallel with the solid-state switch. The solid-state switch is responsible for quickly interrupting fault current, while the mechanical disconnecting switch provides reliable electrical isolation after current transfer, providing sufficient electrical clearance and isolation strength for the solid-state switch. The magnetic latching linkage mechanism 100 ensures fast, stable, and power-free isolation action, thereby improving the overall safety and reliability of the hybrid DC solid-state circuit breaker.

[0058] This application embodiment also provides a hybrid DC solid-state circuit breaker, including a solid-state switch and the aforementioned mechanical disconnect switch. The mechanical disconnect switch includes mechanical disconnect switch one and mechanical disconnect switch two. The solid-state switch is connected in parallel with mechanical disconnect switch one, and mechanical disconnect switch two is connected in parallel in the circuit where mechanical disconnect switch one is located, and is also connected in series in the circuit where the solid-state switch is located. During the process of the hybrid DC solid-state circuit breaker being turned on, mechanical disconnect switch two, the solid-state switch, and mechanical disconnect switch one are closed sequentially, and the solid-state switch is opened. During the process of the hybrid DC solid-state circuit breaker being turned off, the solid-state switch is closed, and mechanical disconnect switch one, the solid-state switch, and mechanical disconnect switch two are opened sequentially.

[0059] It should be noted that during the connection process, mechanical disconnect switch 2, solid-state switch, and mechanical disconnect switch 1 are closed sequentially, and then the solid-state switch is opened. That is, mechanical disconnect switch 2 is closed first to establish a physical path under the premise of safe isolation; then the solid-state switch is closed to bear the initial load current and suppress the operating overvoltage; then mechanical disconnect switch 1 is closed to transfer the steady-state large current to the mechanical path with low conduction loss; finally, the solid-state switch is opened to remove it from the main current-carrying state and only serve as a backup path or transient support unit.

[0060] During the disconnection process, the solid-state switch closes, and mechanical disconnect switches one, two, and three others open sequentially. First, the solid-state switch closes, allowing it to carry and shunt current in advance, creating zero-current or low-current interruption conditions for mechanical disconnect switch one. Then, mechanical disconnect switch one opens, completing the main circuit disconnection in the absence of an electric arc or with a small electric arc. Next, the solid-state switch opens, ending its current-carrying task. Finally, mechanical disconnect switch two opens, forming a visible break in the circuit containing the solid-state switch, completing the final electrical isolation.

[0061] The above description is merely an optional 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.

[0062] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this application will not describe the various possible combinations separately.

Claims

1. A magnetic holding linkage mechanism, characterized in that, The device includes a magnetic system (10) and a moving contact assembly (40). The magnetic system (10) includes a permanent magnet (11) and a moving iron core (12). The moving iron core (12) can move linearly between the closed position and the open position along a first direction, and when it reaches the closed position or the open position, it forms a magnetic hold through the magnetic force of the permanent magnet (11). The moving contact assembly (40) includes a moving contact (41). The moving iron core (12) is linked with the moving contact assembly (40) so that the moving contact assembly (40) moves linearly along a second direction that intersects with the first direction, so that the moving contact (41) contacts or separates from the stationary contact (200) of the mechanical disconnector.

2. The magnetic holding linkage mechanism according to claim 1, characterized in that, The magnetic system (10) further includes a coil (13) and a yoke (14). The moving iron core (12) is linearly disposed within the movement area defined by the yoke (14) and is switched between the closed position and the open position by the energization of the coil (13). The coil (13) includes a closing coil (131) located at the lower part of the yoke (14) and an opening coil (132) located at the upper part of the yoke (14). The permanent magnet (11) is located between the closing coil (131) and the opening coil (132).

3. The magnetic holding linkage mechanism according to claim 1, characterized in that, It also includes a mechanism support (20) and a connecting rod (30); the mechanism support (20) is fixedly connected to the moving iron core (12) and can move synchronously with the moving iron core (12) along the first direction; the two ends of the connecting rod (30) are respectively hinged to the mechanism support (20) and the moving contact assembly (40), and the moving contact assembly (40) can move linearly along the second direction under the drive of the connecting rod (30).

4. The magnetic holding linkage mechanism according to claim 3, characterized in that, The number of the connecting rod (30) and the moving contact assembly (40) is two. The two connecting rods (30) are symmetrically arranged on opposite sides of the mechanism support (20), and the two connecting rods (30) and the two moving contact assemblies (40) are arranged in a one-to-one correspondence.

5. The magnetic holding linkage mechanism according to claim 1, characterized in that, The first direction is perpendicular to the second direction.

6. The magnetic holding linkage mechanism according to claim 1, characterized in that, The moving contact assembly (40) includes a contact bracket (43), a contact fixing bracket (44), and an elastic element (42). The contact bracket (43) is connected to the connecting rod (30). The contact fixing bracket (44) and the contact bracket (43) are arranged opposite to each other along the second direction. The moving contact (41) is disposed on the contact fixing bracket (44). The elastic element (42) is disposed between the contact bracket (43) and the contact fixing bracket (44). The elastic element (42) is used to provide contact pressure to the moving contact (41) in the closed state.

7. The magnetic holding linkage mechanism according to claim 1, characterized in that, The moving contact assembly (40) further includes a magnetizing block (45), which is disposed on opposite sides or one side of the moving contact (41).

8. The magnetic holding linkage mechanism according to claim 7, characterized in that, The magnetizing block (45) includes a U-shaped magnetizing block (451) and a plate-shaped magnetizing block (452), which together cover the outside of the moving contact (41).

9. The magnetic holding linkage mechanism according to claim 1, characterized in that, The permanent magnet (11) is a circular ring plate. The permanent magnet (11) includes a first permanent magnet (111) and a second permanent magnet (112) that are magnetically repulsive. The first permanent magnet (111) and the second permanent magnet (112) are semi-circular ring plates. The permanent magnet (11) is formed by connecting the first permanent magnet (111) and the second permanent magnet (112). The moving iron core (12) can move in the hole of the permanent magnet (11).

10. The magnetic holding linkage mechanism according to claim 9, characterized in that, The permanent magnet (11) has a ring-shaped magnetizing block (15) inside the hole; and / or, the permanent magnet (11) has a fully enclosed magnetizing block (16) with a circular hole inside the outside.

11. A mechanical disconnect switch, characterized in that, It includes a stationary contact and a magnetic holding linkage mechanism (100) as described in any one of claims 1 to 10, wherein the stationary contact is correspondingly provided with the moving contact (41) of the magnetic holding linkage mechanism (100).

12. A hybrid DC solid-state circuit breaker, characterized in that, Includes a solid-state switch and a mechanical disconnect switch as described in claim 11 connected in parallel with the solid-state switch.

13. A hybrid DC solid-state circuit breaker, characterized in that, The invention includes a solid-state switch and the mechanical disconnect switch as described in claim 11. The mechanical disconnect switch includes a mechanical disconnect switch one and a mechanical disconnect switch two. The solid-state switch is connected in parallel with the mechanical disconnect switch one. The mechanical disconnect switch two is connected in parallel in the circuit where the mechanical disconnect switch one is located and is connected in series in the circuit where the solid-state switch is located. During the connection process of the hybrid DC solid-state circuit breaker, the mechanical disconnect switch 2, the solid-state switch, and the mechanical disconnect switch 1 are closed in sequence, and the solid-state switch is opened; during the disconnect process of the hybrid DC solid-state circuit breaker, the solid-state switch is closed, and the mechanical disconnect switch 1, the solid-state switch, and the mechanical disconnect switch 2 are opened in sequence.

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