Wide-gap multipurpose magnetically latched relay

Abstract

The utility model relates to a big opening distance multipurpose magnetic latching relay, it includes cover, sliding block, static sheet and lead-out sheet, static sheet is equipped with static contact, the spring piece assembly of variable fulcrum is equipped in the cover, and the spring piece assembly includes swing piece and spring piece, swing piece is fixed with spring piece one end and connects moving contact, swing piece relative cover swing as fulcrum A, swing piece's middle part is equipped with recess, recess bottom as fulcrum B, spring piece other end links with sliding block, the distance of fulcrum A distance slot is less than the distance of fulcrum A distance moving contact, the distance of fulcrum B distance slot is greater than the distance of fulcrum B distance moving contact. When spring piece drives spring piece assembly along fulcrum A swing and is in position, the moving contact of spring piece assembly and corresponding static contact contact, when sliding block further promotes spring piece to be in position, spring piece swings and deforms along fulcrum B, and moving contact and static contact keep and close, and static sheet and lead-out sheet between conduction. Above realizes magnetic latching relay big opening distance on-off, and the reliability and stability are high.

Description

Technical Field

[0001] This utility model relates to the field of relays, and is a large-aperture, multi-purpose magnetic latching relay. Background Technology

[0002] A magnetic latching relay is an automatic switch that, like other electromagnetic relays, automatically connects and disconnects circuits. However, unlike other relays, the normally closed or normally open state of a magnetic latching relay relies entirely on the action of a permanent magnet. The switching state is triggered by a pulse electrical signal of a certain width from the coil assembly. For example, Chinese patent document CN2011122102Y, published on September 10, 2008, entitled "A Magnetic Latching Relay for Control," uses a conventional pusher plate and spring structure. The pusher plate pushes the spring to make the moving contact contact the stationary contact. Its advantage is simplicity, but its disadvantage is the small electrical clearance between the moving and stationary contacts, resulting in weak arc resistance and segmentation capability, making it unsuitable for the high-current switching requirements of the current national power grid. According to the technical requirements for built-in switches in existing electricity meters, the built-in switch should have the ability to withstand rated safe short-time withstand current (6000A, 10ms), rated operating short-time withstand current (3000A, 10ms), and rated short-circuit making capability (3000A, 10ms). After continuously applying 150A for 8 hours and 200A for 4 hours to the load switch, the switch's opening and closing functions should be normal, the contact resistance of the switch should be ≤1.0mΩ, and when the switch is in the open state, the leads of the main circuit contacts should be able to withstand a 2kV AC voltage for 1 minute. The load switch should not exhibit arcing, flashover, or insulation breakdown, and the leakage current should be less than 1mA. Based on these technical requirements, higher requirements are also placed on the electrical clearance of the magnetic latching relay, requiring the electrical clearance between the moving and stationary contacts of the built-in switch to be ≥5.5mm. Clearly, the magnetic latching relay disclosed in the aforementioned patent has a small electrical clearance, making it difficult to meet the requirements for high current.

[0003] To address the issue of small contact gap between the moving and stationary contacts in magnetic latching relays, Chinese patent application publication number CN119275057A, published on January 7, 2025, entitled "A Switching Structure for a Large-Gap Relay and a Magnetic Latching Relay," discloses a bridging element between the moving and stationary contacts. This bridging element provides an elastic connection, allowing it to synchronously contact or separate from both the moving and stationary contacts. This dual-contact, dual-contact scheme doubles the electrical clearance compared to the original single-contact, single-contact scheme, making it easier to meet electrical clearance requirements of 5.5mm or greater and suitable for high-current switching control. However, this magnetic latching relay has drawbacks: the dual contacts require greater magnetic holding force to achieve reliable contact, and the synchronization requirements of the dual contacts are high. Furthermore, due to space constraints, it is difficult to design a reasonable arc-extinguishing structure, resulting in difficulty in guaranteeing the required high arc resistance during actual switching and a shorter service life. To improve arc resistance, the space where the moving and stationary contacts are located is sometimes set as a vacuum or filled with inert protective gas to enhance arc resistance. However, this method is costly and difficult to mass-produce.

[0004] In addition to the aforementioned shortcomings, existing magnetic latching relays suffer from several drawbacks. The electromagnetic mechanism driving the magnet assembly through rotation is constantly subject to a counterforce from the spring, requiring significant driving force and resulting in relatively high power consumption. Furthermore, existing magnetic latching relays are typically used independently or in a series of independent functions, making them difficult to combine and expand, resulting in relatively limited functionality and scalability. Therefore, improvements to existing magnetic latching relays are necessary. Summary of the Invention

[0005] To overcome the aforementioned shortcomings, the purpose of this utility model is to provide a large-pitch, multi-purpose magnetic latching relay in the field. This addresses the technical problems of existing magnetic latching relays, such as small electrical spacing, making them unsuitable for high-current applications, or, while meeting high-current requirements, insufficient arc resistance due to a suboptimal arc-extinguishing structure, resulting in short service life and high cost, as well as the limited functionality and scalability of existing magnetic latching relays. This objective is achieved through the following technical solution.

[0006] A large-aperture, multi-purpose magnetic latching relay includes a housing, an electromagnetic coil assembly fixed to the housing, a magnet assembly that rotates due to changes in the magnetic poles of the electromagnetic coil assembly, and a slider that reciprocates within the housing, driven by a lever integrated into the magnet assembly. The housing is fixedly provided with a stationary plate and a lead-out plate. The key structural feature is that the stationary plate has a stationary contact at one end extending into the housing. A variable-fulcrum spring assembly is provided within the housing. The spring assembly includes a swaying plate and a spring. One end of the swaying plate and the spring is fixed and connected to a moving contact. The swaying plate rotates relative to the housing, and the rotation point serves as fulcrum A of the spring assembly. The middle of the swaying plate has a notch adapted to the swing of the spring, and the bottom of the notch serves as fulcrum B for the spring to swing and deform to one side. The fulcrum A and the lead-out plate... The pivot axis at point B is parallel, and the other end of the spring is connected to the slot of the slider. The distance from the fulcrum A to the slot is less than the distance from the fulcrum A to the moving contact, and the distance from the fulcrum B to the slot is greater than the distance from the fulcrum B to the moving contact. When the slider slides from one end to the other, the spring assembly forms two stages. Stage 1: The slider pushes the spring, and the spring drives the entire spring assembly to swing relative to the cover along the fulcrum A of the pivot plate, until the moving contact abuts against the stationary contact of the stationary plate. In this state, the spring is not deformed. Stage 2: The slider pushes the spring to swing along the fulcrum B, and the deformation force of the swinging spring pushes the moving contact and the stationary contact to form a retaining force. Through the variable fulcrum design of the reed assembly described above, when the slider pushes the reed assembly to rotate in the first stage, the distance from fulcrum A to the slider slot is less than the distance from fulcrum A to the moving contact. This allows the slider's short stroke to drive the reed assembly's large arc swing stroke, satisfying the requirement for a large opening between the moving and stationary contacts. When the slider deforms in the second stage, the distance from fulcrum B to the moving contact is less than the distance from fulcrum B to the slider slot. Therefore, utilizing the lever arm principle of a lever-saving mechanism, the small force of the slider pushing the reed is transformed into a large holding force that keeps the reed in contact with the moving and stationary contacts. This makes the contact between the moving and stationary contacts more reliable and stable, meeting the electrical force requirements for breaking the circuit. In addition, this holding force provides an initial force for the slider to slide when the magnet assembly's swing arm drives it, effectively reducing the driving requirements of the magnet assembly, thus reducing the power consumption of the magnet assembly and achieving energy saving and emission reduction.

[0007] The stationary plates include stationary plate A and stationary plate B, each with a stationary contact arranged opposite to the other. The reed assembly has moving contacts on both sides at one end. When the reed assembly swings to its designated position, the moving contact on the corresponding side forms a tight contact with the corresponding stationary contact. The reed assembly includes a fixed clamp, which is fixed to one end of the moving contact of the reed and the swing plate. The fixed clamp and the swing plate clamp the reed, and the fixed clamp forms the same fulcrum B for the reed swinging to the other side. This structure ensures that the reed of the reed assembly satisfies the double-sided fulcrum B structure, thus achieving reliable tight contact between the moving contact and the stationary contacts on both sides when the reed assembly slides to its designated position with the slider.

[0008] The magnetic latching relays are arranged in at least two side by side. The levers in each magnetic latching relay are connected by a synchronous shaft to swing synchronously. The housing of each magnetic latching relay has a swing hole that passes through the synchronous shaft and is adapted to allow the synchronous shaft to swing with the lever. This structure enables synchronous multi-channel on / off control when multiple magnetic latching relays are used in combination. Even if the electromagnetic coils of some magnetic latching relays fail, the electromagnetic coil capacity of the remaining magnetic latching relays can still meet the normal opening and closing requirements of all magnetic latching relays.

[0009] The magnetic latching relays are arranged in at least two side by side. Each magnetic latching relay has a linkage slot on both sides of its slider. The housing of each magnetic latching relay has an interlocking hole corresponding to the linkage slot, and an interlocking rod is installed within the interlocking hole. The two ends of the interlocking rod extend into the linkage slots of the adjacent magnetic latching relay sliders. When the slider of one magnetic latching relay slides until its moving contact of the spring assembly connects with the stationary contact of the corresponding stationary contact A, the interlocking rod swings along the interlocking hole under the push of the slider, pushing the slider of the other magnetic latching relay to slide until its moving contact of the spring assembly connects with the stationary contact of the corresponding stationary contact B. This structure enables interlocking linkage between multiple magnetic latching relays, allowing for multi-channel cross-connection control when used in combination, such as meeting the forward and reverse rotation control requirements of a motor.

[0010] The magnetic steel assembly has a latching slot on one side of the swing arm, into which a manual lever is plugged and connected. The housing of the magnetic latching relay has an opening for the manual lever to extend and swing. This structure facilitates manual operation of the swing arm, thus enabling manual control of the relay's on / off state.

[0011] An arc-extinguishing assembly is provided above the contact stroke position of the moving and stationary contacts within the housing. This assembly includes an arc-extinguishing plate positioned above the moving contact in the direction of the contact stroke of the spring assembly, and permanent magnets positioned on both sides in the same direction. The arc-extinguishing plate is fixed in an arc-extinguishing plate groove on the top of the housing, and the permanent magnets are fixed in magnet mounting seats on both sides of the housing. The permanent magnets on both sides generate a magnetic field that directs the arc between the moving and stationary contacts towards the arc-extinguishing plate. This structure achieves reliable arc extinguishing.

[0012] The stationary contact of the magnetic latching relay is removable and plug-in to the housing. After disassembly, the original stationary contact position is replaced with a non-conductive component, which does not protrude from the housing. This structure facilitates the adjustment of the number of stationary contacts, enabling switching between single and dual-channel operation.

[0013] This invention improves the stability of the magnetic latching relay by designing the spring of the magnetic latching relay as a variable fulcrum structure, thereby achieving large-pitch switching while improving the reliability of the tight contact between the moving and stationary contacts. Furthermore, the magnetic latching relay can be quickly switched to form single or dual-path switching control, or combined to form multi-path switching control, depending on the control requirements. It can be divided into synchronous multi-path switching control and synchronous multi-path opposite-direction switching control, offering diverse functions, high switching reliability, low failure rate, low energy consumption, and long service life. It is suitable for use as a magnetic latching relay in the electrical field, or as a structural improvement of similar products. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the internal structure of this utility model, where A represents fulcrum A.

[0015] Figure 2 yes Figure 1 A schematic diagram of the structure with added manual lever.

[0016] Figure 3 yes Figure 1 The diagram shows the structure of the reed assembly, where B represents the fulcrum B.

[0017] Figure 4 This is a schematic diagram of the structure of the multi-channel magnetic latching relay with synchronous shaft of this utility model.

[0018] Figure 5 This is a schematic diagram of the structure of the multi-channel magnetic latching relay with interlocking rod of this utility model.

[0019] Figure 6 yes Figure 1 The diagram shows the structure of the arc-extinguishing component, where A represents fulcrum A.

[0020] Figure 7 yes Figure 6 The structural diagram of the casing is omitted.

[0021] Figure 8 This is a schematic diagram of the structure of the multi-channel magnetic latching relay combination of this utility model.

[0022] Figure 9 yes Figure 1 A schematic diagram showing the replacement of stationary plate A with a non-conductive component.

[0023] The numbers and names in the diagram are as follows: 1. Cover, 101. Shaft hole, 102. Opening, 103. Swing hole, 2. Electromagnetic coil assembly, 3. Magnet assembly, 301. Swing rod, 302. Snap-in slot, 303. Manual lever, 4. Slider, 401. Slot A, 402. Slot B, 403. Linkage slot, 404. Magnet, 5. Spring assembly, 501. Swing plate, 5011. Shaft plate, 5012. Notch, 502. Spring, 503. Fixing clip, 6. Moving contact, 7. Stationary plate, 701. Stationary plate A, 702. Stationary plate B, 703. Stationary contact, 8. Lead-out plate, 9. Synchronous shaft, 10. Interlocking rod, 11. Arc extinguishing plate, 12. Magnetic block mounting base, 13. Magnetic block, 14. Swing base, 15. Non-conductive component. Detailed Implementation

[0024] The present invention will now be further described with reference to the accompanying drawings.

[0025] like Figures 1-3 As shown, the magnetic latching relay includes a housing 1, an electromagnetic coil assembly 2, and a magnet assembly 3. The housing is fixed with a stationary plate and a lead-out plate 8. The electromagnetic coil assembly is fixed inside the housing and includes a coil support, an iron core, a coil (not shown in the figure), and a yoke. Specifically, the coil support has an iron core in the middle and a coil wound around it, with bent yokes at both ends. The magnet assembly includes a housing that swings relative to the housing. A permanent magnet is located inside the housing, and double-headed yokes that conduct magnetic energy to the permanent magnet are located on both sides of the housing. The magnet assembly forms a magnetic attraction with the yokes at both ends of the electromagnetic coil assembly through the double-headed yokes on both sides, thus forming a magnetic latching engagement. The housing of the magnet assembly integrates a swing arm 301. When the electromagnetic coil assembly is energized to generate positive and negative electrical signals, it drives the swing arm to reciprocate relative to the housing. One side of the swing arm of the magnet assembly has a latching slot 302, into which a manual lever 303 is plugged and connected. The housing of the magnetic latching relay has an opening 102 for the manual lever to extend and swing.

[0026] The aforementioned housing 1 is divided into two regions, left and right. The left region houses the electromagnetic coil assembly 2 and the magnet assembly 3. The upper part of the right region has a pair of separated stationary plates, namely stationary plate A701 and stationary plate B702. Stationary plates A and B are detachably plugged into the housing. The outer ends of stationary plates A and B extend out of the housing for external wiring, and the inner ends extend into the housing and form an oblique bend, with a stationary contact 703 on the oblique bend. The lower part of the right region has a lead-out piece 8. The bottom side of the housing has a slider 4 that traverses the two regions and reciprocates and slides with a limiting motion. The slider in the left region has a slot A401 that mates with the end of the aforementioned rocker arm 301. The slider reciprocates as it swings with the rocker arm. The right region of the housing has a spring assembly 5 that limits the swing. When the spring assembly swings to its position on both sides, the moving contact 6 at one end of the spring assembly makes contact with the stationary contacts of stationary plates A701 and B702, respectively. The reed assembly is a variable fulcrum structure. The reed assembly includes a swing plate 501, a reed 502 and a fixed clamping plate 503. One end of the swing plate, the reed, and the fixed clamping plate is fixed and connected to the moving contact 6. The swing plate forms a positioning swing by engaging with the shaft hole 101 integrated on one side of the housing and the shaft hole of the swing shaft seat 14 installed on the other side through the shaft plates 5011 on both sides. The swing point serves as the fulcrum A of the reed assembly. The middle part of the oscillating plate is provided with a notch 5012 adapted to the swing of the spring. The bottom of the notch serves as the fulcrum B for the spring to swing and deform to one side. The other end of the fixed clamp is flush with the bottom of the notch and also serves as the fulcrum B for the spring to swing and deform to the other side. The sway axis at fulcrum A and fulcrum B is parallel. The other end of the spring is connected to the slot B402 provided on the slider to form a plug-in linkage. The distance between fulcrum A and slot B is less than the distance between fulcrum A and moving contact, and the distance between fulcrum B and slot B is greater than the distance between fulcrum B and moving contact. When the slider slides from one end to the other, the reed assembly forms two stages. Stage 1: The slider pushes the reed, and the reed causes the entire reed assembly to swing relative to the cover along the pivot point A of the swing plate, until the moving contact abuts against the stationary contact of the stationary plate. In this state, the reed is not deformed. Stage 2: The slider pushes the reed to swing along the pivot point B, and the deformation force of the swinging reed pushes the moving contact and the stationary contact to form a retaining force.

[0027] like Figure 4 , Figure 8 The diagram shows one method for the extended use of magnetic latching relays: at least two magnetic latching relays are arranged side by side, and the rocker arms 301 in each magnetic latching relay are connected by a synchronous shaft 9 to swing synchronously. The housing of each magnetic latching relay is provided with a rocker hole 103 for the synchronous shaft to pass through and for the synchronous shaft to swing with the rocker arm.

[0028] like Figure 5The diagram illustrates a second method for extending the use of magnetic latching relays: At least two magnetic latching relays are arranged side-by-side. Each magnetic latching relay has a sliding block 4 with two linkage slots 403 on both sides. The housing of each magnetic latching relay has an interlocking hole corresponding to the linkage slot, and an interlocking rod 10 is installed within the interlocking hole. Both ends of the interlocking rod extend into the linkage slots of the adjacent magnetic latching relay sliders. When the slider of one magnetic latching relay slides until the moving contact 6 of its spring assembly 5 connects with the stationary contact 703 of the corresponding stationary piece A701, the interlocking rod swings along the interlocking hole under the push of the slider, thus pushing the slider of the other magnetic latching relay to slide until the moving contact of its spring assembly connects with the stationary contact of the corresponding stationary piece B702. A magnet 404 can also be embedded in the bottom of the slider, and a Hall element that senses the magnet is located at the bottom of the housing. This method is used to monitor the slider's position.

[0029] like Figure 6 , Figure 7 As shown, an arc-extinguishing assembly is provided above the contact stroke position of the moving contact 6 and the stationary contact 703 in the right-side region inside the housing 1. The arc-extinguishing assembly includes an arc-extinguishing plate 11 arranged above the moving contact in the direction of the contact stroke of the corresponding spring assembly 5, and permanent magnets 13 arranged on both sides in the direction of the contact stroke of the corresponding moving contact. The arc-extinguishing plate is fixed in the arc-extinguishing plate groove on the top of the housing, and the permanent magnets are fixed in the magnet mounting seats 12 provided on both sides of the housing. The permanent magnets on both sides form a magnetic field to guide the arc between the moving contact and the corresponding stationary contact to the arc-extinguishing plate. This structure achieves reliable arc extinguishing.

[0030] like Figure 9 As shown, the stationary plate A701 in the housing 1 of the magnetic latching relay can also be removed and replaced with a non-conductive component 15. The non-conductive component does not protrude from the housing, and its inner side only provides the same limiting function as the stationary plate A for the spring assembly's swing into position. Through this structural change, the magnetic latching relay can be used as a single-channel control relay.

[0031] The magnetic latching relay operates as follows: The electromagnetic coil assembly 2 drives the rocker arm 301 of the magnet assembly 3 to rotate. The rocker arm drives the slider 4 to move, which in turn pushes the reed. The reed causes the rotating plate 501 of the reed assembly 5 to rotate along fulcrum A to its designated position. The moving contact at one end of the reed assembly contacts the corresponding stationary contact 703 of stationary plate A701 or stationary plate B702. When the slider further pushes the reed until it reaches its final position, the reed swings and deforms along fulcrum B to its final position. The deformation force of the reed is converted into a retaining force between the moving contact 6 and the stationary contact 703. Under the magnetic retaining force of the magnet assembly, the slider remains stationary after reaching its final position, and the moving contact and the corresponding stationary contact remain in a retaining state, i.e., there is conduction between the stationary plate and the lead plate. When the electromagnetic coil assembly drives the rocker arm of the magnet assembly to rotate in the opposite direction, the retaining force between the moving contact and the stationary contact is converted into a reverse thrust, providing an initial thrust to the slider. This effectively reduces the driving force requirement of the electromagnetic coil assembly and reduces power consumption. When the slider moves in the reverse direction, it pushes the reed assembly again to follow the above process, so that the moving contact is connected to and pressed against the stationary contact of the other side plate, realizing the switching and conduction between the stationary plate and the lead-out plate.

[0032] When the above-mentioned magnetic latching relays are used in parallel, and the rocker arms 301 of adjacent magnetic latching relays are all connected by the synchronous shaft 9, the working method is as follows: the rocker arms of the magnetic latching relays arranged in parallel are connected by the synchronous shaft to form a synchronous state; when all or part of the electromagnetic coil assembly 2 in the magnetic latching relays arranged in parallel drive the rocker arms of the magnet assembly 3 to swing, the rocker arms are linked by the synchronous shaft to form synchronous swing, the rocker arms are linked to the corresponding slider 4 to slide, the slider drives the corresponding spring assembly 5 to swing to the moving contact 6 and the corresponding stationary contact 703 of the stationary plate 7 to conduct, and the deformation of each spring assembly keeps the moving contact and the corresponding stationary contact connected.

[0033] When the aforementioned magnetic latching relays are used side-by-side, and the two sliders 4 of adjacent magnetic latching relays are interlocked via the interlocking rod 10, the operation is as follows: when the slider of one magnetic latching relay slides to one side, the slider of the other magnetic latching relay slides to the opposite side, always maintaining synchronous reverse movement and positioning of the two sliders. This means that when the moving contact 6 of the reed assembly 5 of one magnetic latching relay is connected to the stationary contact 703 of one stationary plate A701, the moving contact of the reed assembly of the other magnetic latching relay is connected to the stationary contact of the other stationary plate B, always maintaining synchronous opposite contact between the moving and stationary contacts of adjacent magnetic latching relays. This method is suitable for forward and reverse switching control of equipment such as motors.

[0034] The above description is intended to illustrate the technical means of this utility model and is not intended to limit the technical scope of this utility model. Any obvious improvements made to this utility model by those skilled in the art based on existing common knowledge also fall within the protection scope of the claims of this utility model.

Claims

1. A large-pitch, multi-purpose magnetic latching relay, comprising a housing (1), an electromagnetic coil assembly (2) fixed to the housing, a magnet assembly (3) driven to rotate by changes in the magnetic poles of the electromagnetic coil assembly, and a slider (4) driven by a lever integrated into the magnet assembly and reciprocating within the housing, wherein the housing is fixedly provided with a stationary plate (7) and a lead-out plate (8); characterized in that... The stationary plate (7) has a stationary contact (703) at one end that extends into the cover (1). The cover has a spring assembly (5) with a variable fulcrum. The spring assembly includes a swing plate (501) and a spring (502). The swing plate is fixed to one end of the spring and connected to a moving contact (6). The swing plate forms a positioning swing relative to the cover, and the swing point serves as the fulcrum A of the spring assembly. The middle part of the swing plate has a notch (5012) adapted to the swing of the spring. The bottom of the notch serves as the fulcrum B for the spring to swing and deform to one side. The swing axis at fulcrum A and fulcrum B is parallel. The other end of the spring forms a plug-in linkage with the slot provided by the slider (4). The distance from fulcrum A to the slot is less than the distance from fulcrum A to the moving contact, and the distance from fulcrum B to the slot is greater than the distance from fulcrum B to the moving contact. When the slider slides from one end to the other, the reed assembly forms two phase states. Phase state one: The slider pushes the reed, and the reed causes the entire reed assembly to swing relative to the cover along the fulcrum A of the swing plate, and swings until the moving contact abuts against the stationary contact of the stationary plate. In this state, the reed is not deformed. Phase state two: The slider pushes the reed to swing along the fulcrum B, and the deformation force of the swinging reed pushes the moving contact and the stationary contact to form a retaining force.

2. The large-aperture multi-purpose magnetic latching relay according to claim 1, characterized in that... The stationary plate (7) includes stationary plate A (701) and stationary plate B (702). Both stationary plates A and B are provided with stationary contacts (703), and the two stationary contacts are arranged opposite to each other. One end of the reed assembly (5) is provided with moving contacts (6) on both sides. When the reed assembly swings to the position on both sides, the moving contact on the corresponding side forms a tight contact with the corresponding stationary contact. The reed assembly includes a fixed clamp (503). The fixed clamp is fixed to one end of the moving contact of the reed (502) and the swing plate (501). The fixed clamp and the swing plate clamp the reed, and the fixed clamp forms the same fulcrum B for the reed to swing to the other side.

3. The large-aperture multi-purpose magnetic latching relay according to claim 1 or 2, characterized in that... The magnetic latching relays are provided in at least two side by side, and the levers (301) of each magnetic latching relay are connected by a synchronous shaft (9) to swing synchronously. The housing (1) of each magnetic latching relay is provided with a swing hole (103) for passing through the synchronous shaft and adapting to the swing of the synchronous shaft as the lever swings.

4. The large-aperture multi-purpose magnetic latching relay according to claim 2, characterized in that... The magnetic latching relays are provided in at least two side by side. Each magnetic latching relay has a linkage slot (403) on both sides of the slider (4). The cover (1) of each magnetic latching relay is provided with an interlocking hole at the corresponding linkage slot. An interlocking rod (10) is provided in the interlocking hole. The two ends of the interlocking rod extend into the linkage slots of the two sliders in the adjacent magnetic latching relays respectively. When the slider of one magnetic latching relay slides to the point where the moving contact (6) of its spring assembly (5) is connected to the stationary contact (703) of the corresponding stationary piece A (701), the interlocking rod swings along the interlocking hole under the push of the slider, and pushes the slider of the other magnetic latching relay to slide to the point where the moving contact of its spring assembly is connected to the stationary contact of the corresponding stationary piece B (702).

5. The large-aperture multi-purpose magnetic latching relay according to claim 1, characterized in that... The magnetic steel assembly (3) has a buckle groove (302) on one side of the swing arm (301), and a manual lever (303) is plugged into the buckle groove. The housing (1) of the magnetic latching relay has an opening (102) adapted to the extension and swing operation of the manual lever.

6. The large-aperture multi-purpose magnetic latching relay according to claim 1, characterized in that... An arc-extinguishing assembly is provided above the contact stroke position of the moving contact (6) and the stationary contact (703) inside the housing (1). The arc-extinguishing assembly includes an arc-extinguishing plate (11) arranged above the contact stroke direction of the moving contact of the spring assembly (5), and permanent magnets (13) arranged on both sides corresponding to the contact stroke direction of the moving contact. The arc-extinguishing plate is fixed in the arc-extinguishing plate groove at the top of the housing, and the permanent magnets are fixed in the magnet mounting seats (12) provided on both sides of the housing. The permanent magnets on both sides form a magnetic field to guide the electric arc between the moving contact and the corresponding stationary contact to the arc-extinguishing plate.

7. The large-aperture multi-purpose magnetic latching relay according to claim 1, characterized in that... The stationary plate (7) of the magnetic latching relay is removable and plugged into the housing (1). After disassembly, the original stationary plate position is replaced by a non-conductive component (15), which does not protrude from the housing.

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