Magnetic latching relay with self-locking structure

Abstract

The application relates to the technical field of relays, and discloses a magnetic latching relay with a self-locking structure. The relay comprises a fixed base, a movable spring seat detachably connected with the fixed base, the movable spring seat divides the fixed base into two spaces with different areas, wherein the first space has a smaller area, and the second space has a larger area; a static spring seat arranged in the fixed base and located in the first space, static contacts arranged on the static spring seat, and a flat folding spring piece assembly located in the first space; a coil assembly and a self-locking assembly connected with the coil assembly, both of which are located in the second space, and the self-locking assembly abuts against the flat folding spring piece assembly. The flat folding spring piece assembly in the device changes the shape and structure of the existing first flow guide piece, the second flow guide piece and the third beryllium copper elastic piece, improves the longitudinal rigidity on the basis of reserving the transverse force reduction function, and maximally resists the electric repulsive force for promoting the contact separation.

Description

Technical Field

[0001] This invention relates to the technical field of relays, specifically a magnetic latching relay with a self-locking structure. Background Technology

[0002] Magnetic latching relays are widely used in smart meters, reactive power compensation, and intelligent control equipment. They are an environmentally friendly type of relay. A magnetic latching relay only requires a momentary energization of its coil to open and close the relay contacts. Once energized, it maintains its state without requiring further energization of the coil. This is achieved through the magnetism of a permanent magnet. The difference between a magnetic latching relay and a regular relay is its holding function; once triggered by a pulse, the relay retains its original state even if the coil is de-energized. Magnetic latching relays are bistable relays that control contact switching via pulse signals. They are characterized by low energy consumption and stable reliability, and are widely used in smart meters, reactive power compensation devices, and smart home applications.

[0003] With the development of the electricity meter industry and the increasing demands for safety performance, the industry is gradually requiring higher levels of safety. This necessitates improved safety for core components like relays to adapt to various metering solutions. In power systems, relays, as critical control elements, directly affect the safety and reliability of the entire system due to their short-circuit withstand capability. According to the IEC 62055-31 standard, relay short-circuit withstand capability is divided into several levels, with UC4 being the highest. This level requires the relay to withstand a 10kA short-circuit current surge and continue operating normally after withstanding three 4.5kA short-circuit current surges.

[0004] Most magnetic latching relays on the market currently only meet the UC2 or UC3 standards, with short-circuit capabilities typically ranging from 2.5kA to 6kA. With the rapid development of smart grids, the requirements for relays' short-circuit withstand capabilities are increasing, especially in critical equipment such as electricity meters, where relays with higher safety levels are needed to ensure stable system operation.

[0005] Due to space limitations in meters, traditional relay drive structures cannot simultaneously balance structural strength and performance parameter optimization within a limited volume. Existing magnetic latching relays suffer from the aforementioned shortcomings in their structural design.

[0006] Therefore, how to redesign the internal space of the magnetic latching relay is a problem that needs to be solved. Summary of the Invention

[0007] This invention provides a magnetic latching relay with a self-locking structure to solve the above-mentioned problems existing in the prior art.

[0008] A magnetic latching relay with a self-locking structure includes:

[0009] A fixed base and a movable spring seat detachably connected to the fixed base, wherein the movable spring seat divides the fixed base into two spaces with different areas, wherein the smaller area is the first space and the other is the second space;

[0010] A stationary spring seat, disposed in a fixed base and located within the first space, a stationary contact disposed on the stationary spring seat, and a flat-folded spring assembly located within the first space;

[0011] The coil assembly and the self-locking assembly connected to the coil assembly are both located in the second space, and the self-locking assembly abuts against the flat spring assembly.

[0012] Furthermore, the fixed base is provided with a placement groove, one end of the movable spring seat is located in the placement groove, the movable spring seat is provided with a plurality of placement posts, and the flat-folding spring assembly is provided with a plurality of placement holes adapted to the placement posts;

[0013] The flat-folding spring assembly is sleeved on the placement post through the placement hole and is located in the placement groove with the placement post.

[0014] Furthermore, the flat-folding spring assembly is provided with a first guide plate, a second guide plate, and a third beryllium copper elastic plate in sequence from the stationary spring seat to the moving spring seat, as well as a moving contact for connecting the first guide plate, the second guide plate, and the third beryllium copper elastic plate.

[0015] Furthermore, the first guide plate, the second guide plate, and the third beryllium copper elastic plate are all elongated strips, and each of them has a protrusion along its length.

[0016] Both the first and second guide vanes have Z-shaped through holes along their length, and the extension line of one end of the Z-shaped through hole passes through the midpoint of the width direction of the guide vane.

[0017] The first guide plate is also provided with a first bending area, which bends toward the stationary contact point and abuts against the self-locking component.

[0018] Furthermore, the third beryllium copper elastic sheet is provided with a T-shaped through hole and a rectangular hole communicating with the through hole;

[0019] The free end of the third beryllium copper elastic sheet is pre-set with a second bending area, which is closer to the moving contact.

[0020] The third beryllium copper elastic sheet abuts against the self-locking assembly.

[0021] Furthermore, the self-locking assembly includes a self-locking push rod;

[0022] The self-locking push rod includes a rod body, an actuator seat disposed at one end of the rod body, and a drive seat disposed at the other end of the rod body;

[0023] The actuator is provided with a first drive slot, and the drive seat is provided with a second drive slot;

[0024] The first drive groove has a C-shaped structure, the second drive groove has a U-shaped structure, the bottom of the first drive groove is also provided with a reinforcing rib, and the drive seat is also provided with a connection hole communicating with the second drive groove.

[0025] The first bending area extends through the connecting hole;

[0026] The first guide vane, the second guide vane, and the third beryllium copper elastic plate are located in the second drive groove.

[0027] Furthermore, the coil assembly includes a coil frame disposed on the fixed base, a multi-turn coil sleeved on the coil frame, at least two contact seats connected to the fixed base, and a swing member disposed on the fixed base.

[0028] Furthermore, the swinging component includes a movable seat movably connected to the fixed base, two permanent magnets disposed on the movable seat, a drive seat disposed on the movable seat, and a limiting block disposed on the drive seat.

[0029] Furthermore, the movable seat and the permanent magnet form an H-shaped structure, and the free end of the contact seat is located at the upper and lower ends of the H-shaped structure.

[0030] Furthermore, the limiting block is located in the first driving groove, and the limiting block has a recessed area near the bottom of the first driving groove, and the reinforcing rib is located in the recessed area of ​​the limiting block.

[0031] Beneficial Effects: This invention discloses a magnetic latching relay with a self-locking structure. By redesigning the layout of the relay's stationary and moving spring seats and adding a self-locking component, the self-locking push rod and the cooperating magnet assembly and flat spring assembly are all directly inserted, allowing for installation without complex operations. The flat spring assembly in this device changes the shape and structure of the existing first guide plate, second guide plate, and third beryllium copper elastic plate, improving longitudinal rigidity while retaining the lateral force reduction function, thus maximizing resistance to the electro-repulsive force that causes contact separation. Furthermore, by providing through holes in the first and second guide plates, the ends of the first and second guide plates can be divided into two parts with different facing areas, thereby transforming the huge electro-repulsive force generated by the short-circuit current into a favorable factor that enhances the contact pressure, enabling it to stably pass the harsh UC4 level test. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a magnetic latching relay with a self-locking structure according to the present invention;

[0033] Figure 2 This is a cross-sectional view of the magnetic latching relay of the present invention;

[0034] Figure 3 This is a perspective view of the present invention;

[0035] Figure 4 This is a schematic diagram of the self-locking push rod structure of the present invention;

[0036] Figure 5 This is a schematic diagram of the flat-folding spring assembly structure of the present invention.

[0037] Reference numerals in the attached drawings: 1. Fixed base; 2. Coil frame; 3. Magnet fixing frame; 4. Magnet assembly; 41. Movable seat; 42. Permanent magnet; 43. Drive seat; 44. Limiting block; 5. Contact seat; 6. Static spring seat; 7. Self-locking push rod; 8. Static contact; 9. Moving contact; 10. Flat folding spring assembly; 101. First guide vane; 102. Second guide vane; 103. Third beryllium copper elastic sheet; 11. Moving spring seat. Detailed Implementation

[0038] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0039] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0040] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0041] This invention discloses a magnetic latching relay with a self-locking structure, referring to... Figures 1-5 ,include:

[0042] A fixed base 1 and a movable spring seat 11 detachably connected to the fixed base 1, the movable spring seat 11 dividing the fixed base 1 into two spaces with different areas, the smaller area being the first space and the other being the second space; a stationary spring seat 6, disposed in the fixed base 1 and located within the first space, with a stationary contact 8 disposed on the stationary spring seat 6 and a flat-folding spring assembly 10 located within the first space; a coil assembly and a self-locking assembly connected to the coil assembly, both located within the second space, the self-locking assembly abutting against the flat-folding spring assembly 10; the fixed base 1 is also provided with a magnet fixing frame 3, which is hinged to the movable seat 41;

[0043] By redesigning the layout of the relay stationary spring seat 6 and moving spring seat 11, and adding a self-locking component, the self-locking push rod 7 and the matching magnet assembly 4 and flat spring assembly 10 are all directly inserted, so the installation of the equipment can be completed without complicated operations.

[0044] Without increasing the overall size of the relay, a self-locking mechanism and a high-strength contact spring are accommodated simultaneously, solving the problem that existing products are limited by size and cannot meet the requirements of short-circuit resistance. The self-locking component directly abuts against the flat-folded spring assembly 10, and the electromagnetic driving force can be directly transmitted to the contact spring. With the help of the self-locking structure, the spring position is locked under short-circuit impact to prevent the contacts from being separated by electric repulsion and to avoid contact welding.

[0045] The fixed base 1 is provided with a placement groove, one end of the movable spring seat 11 is located in the placement groove, the movable spring seat 11 is provided with a plurality of placement posts, and the flat folding spring assembly 10 is provided with a plurality of placement holes adapted to the placement posts; the flat folding spring assembly 10 is sleeved on the placement post through the placement holes and is located in the placement groove with the placement post.

[0046] The movable spring seat 11 and the flat spring assembly 10 are fixed by riveting;

[0047] During assembly, after fixing the flat folding spring assembly 10 onto the movable spring seat 11, the connecting end of the movable spring seat 11 and the flat folding spring assembly 10 is placed in the placement groove, thereby completing the installation of the flat folding spring assembly 10.

[0048] The placement slot and placement column limiting structure form a multi-point rigid constraint on the flat spring assembly 10. When the short-circuit current generates a huge electric repulsion force, the spring will not undergo lateral or longitudinal displacement deformation, which greatly improves the longitudinal rigidity of the spring and counteracts the contact separation repulsion force.

[0049] The flat-folding spring assembly 10 is housed in the placement slot and is surrounded and limited by the fixed base 1 and the moving spring seat 11. Under vibration and short-circuit impact conditions, there is no risk of loosening or displacement. Each component is locked in place by snap-fit, preventing the mechanism from detaching and failing, and acting as an internal stable anchor point.

[0050] The flat-folding spring assembly 10 is provided with a first guide plate 101, a second guide plate 102, and a third beryllium copper elastic plate 103 in sequence from the stationary spring seat 6 to the moving spring seat 11, as well as a moving contact 9 for connecting the first guide plate 101, the second guide plate 102, and the third beryllium copper elastic plate 103; the first guide plate 101 and the second guide plate 102 can carry large currents, the conductive cross-sectional area is greatly increased, the heat generation and temperature rise are reduced under short-circuit large current, and they can withstand the high temperature impact of UC4 standard, solving the problems of insufficient conductivity and high temperature failure of traditional springs;

[0051] The third beryllium copper elastic sheet 103 provides stable and durable contact pressure. The beryllium copper material is elastic and durable, and the elasticity decays little after multiple short-circuit impacts, ensuring that the contacts stay in place for a long time without separating.

[0052] The three reeds share the same moving contact 9 and are riveted together to form a double-contact scissor differential contact system. The electric repulsion force generated by the short-circuit current will squeeze the reeds in the opposite direction, which will be converted into contact pressure, effectively suppressing contact welding and meeting the stringent UC4 short-circuit test.

[0053] The first guide plate 101, the second guide plate 102, and the third beryllium copper elastic plate 103 are all elongated strips and have protrusions along their length. The first guide plate 101 and the second guide plate 102 each have Z-shaped through holes along their length, and the extension line of one end of the Z-shaped through hole passes through the midpoint of the width direction of the guide plate. The first guide plate 101 also has a first bending area, which bends toward the stationary contact 8 and abuts against the self-locking assembly.

[0054] The protrusion along the length of the spring strengthens the overall bending stiffness of the long spring, improves the longitudinal deformation resistance, and resists the warping and bending caused by the short-circuit electric repulsion force; the first bending area faces the stationary contact 8 and abuts against the self-locking component. The locking force of the self-locking push rod 7 can be directly applied to the front contact position of the guide plate, firmly pressing the contact during impact to prevent the repulsion force from opening the moving and stationary contacts 8.

[0055] The third beryllium copper elastic sheet 103 is provided with a T-shaped through hole and a rectangular hole communicating with the through hole; wherein the free end of the third beryllium copper elastic sheet 103 is provided with a second bending area, the bending area is close to the moving contact 9; the third beryllium copper elastic sheet 103 abuts against the self-locking component;

[0056] The T-shaped through hole is combined with the rectangular hole to optimize the elastic deformation range of the beryllium copper elastic sheet, which ensures high contact pressure while retaining the elastic reset capability required for pulse switching, and meets both the bistable switching and short-circuit resistance pressing requirements of the magnetic latching relay; the second bending area faces the moving contact 9, so that the elastic force of the reed is concentrated on the contact position, further increasing the contact pre-pressure to offset the short-circuit repulsion force; the third beryllium copper elastic sheet 103 directly abuts against the self-locking assembly, and the self-locking mechanism restrains both the flow deflector and the elastic sheet at the same time, which double-locks the entire reed and greatly improves the mechanical structure stability under short-circuit impact.

[0057] The self-locking assembly includes a self-locking push rod 7; wherein the self-locking push rod 7 comprises a rod body, an execution seat arranged at one end of the rod body, and a driving seat 43 arranged at the other end of the rod body; wherein the execution seat is provided with a first driving groove, and the driving seat 43 is provided with a second driving groove; the first driving groove is a C-shaped structure, the second driving groove is a U-shaped structure, the bottom of the first driving groove is further provided with a reinforcing rib, and the driving seat 43 is further provided with a connecting hole communicated with the second driving groove; wherein the first bending area penetrates through the connecting hole; the first flow deflector 101, the second flow deflector 102 and the third beryllium copper elastic sheet 103 are located in the second driving groove; the integrated self-locking push rod 7 integrates dual functions of driving and locking, and self-locking can be completed through direct plug-in assembly without dislocation installation, which simplifies the assembly process; the U-shaped second driving groove completely wraps the three-layer flat-folded reed assembly 10 to form all-round limit for the reed, so that the reed has no lateral offset under short-circuit impact, and the reinforcing rib is matched to improve the structural strength of the execution seat and avoid fracture and deformation of the self-locking rod itself;

[0058] The first bending area penetrates into the connecting hole to realize rigid linkage between the reed and the self-locking rod. When the electrified coil generates a magnetic field to drive the self-locking rod to move, the whole set of reeds can be synchronously driven to complete contact opening and closing, and the state of the reed is continuously locked by the self-locking rod;

[0059] The C-shaped first driving groove reserves a space for matching with the coil swinging member, and the reinforcing rib at the groove bottom improves the stress limit of the self-locking rod, so that the self-locking rod will not undergo plastic deformation and the self-locking function will not fail under multiple 10kA short-circuit impacts.

[0060] The coil assembly includes a coil former 2 arranged on the fixed base 1, a plurality of turns of coils sleeved on the coil former 2, at least two contact seats 5 connected with the fixed base 1, and a swinging member arranged on the fixed base 1;

[0061] It further includes an iron core and a yoke iron.

[0062] The swinging member includes a movable seat 41 movably connected with the fixed base 1, two permanent magnetic members 42 arranged on the movable seat 41, a driving seat 43 arranged on the movable seat 41, and a limit block 44 arranged on the driving seat 43.

[0063] The movable seat 41 and the permanent magnet 42 form an H-shaped structure, and the free end of the contact seat 5 is located at the upper and lower ends of the H-shaped structure.

[0064] The limiting block 44 is located in the first driving groove, and the limiting block 44 has a recessed area near the bottom of the first driving groove. The reinforcing rib is located in the recessed area of ​​the limiting block 44.

[0065] In a further embodiment, the permanent magnet 42 is existing technology, comprising at least one permanent magnet and two magnetically conductive sheets; the permanent magnet is divided into N poles and S poles, and the two magnetically conductive sheets are respectively attached to the N-end face and S-end face of the permanent magnet, thereby forming a complete magnetic circuit to provide a self-locking magnetic force for the magnetic latching relay. Working principle description: includes the following processes, which are the following three steps:

[0066] One is the contact closure and conduction process:

[0067] A positive instantaneous pulse current is passed through the coil on the coil frame 2, and the coil frame 2 forms a directional magnetic field, which generates an electromagnetic attraction force on the H-shaped movable seat 41 in the magnet assembly 4. The movable seat 41 completes the swing based on the fixed base 1.

[0068] The movable seat 41 synchronously drives the drive seat 43 and the limiting block 44 to move together. The limiting block 44 is engaged in the first drive groove of the self-locking push rod 7. The recessed area of ​​the limiting block 44 and the reinforcing rib at the bottom of the groove mesh with each other, driving the self-locking push rod 7 to move as a whole towards the static spring seat 6 and the static contact 8.

[0069] The connecting hole on the self-locking push rod 7 drive seat 43 pulls the first bending area of ​​the first guide plate 101, and the U-shaped second drive groove pushes the entire flat bending spring assembly 10 toward the stationary contact 8; the second bending area of ​​the third beryllium copper elastic plate 103 continuously outputs elastic pressure, so that the moving contact 9 tightly fits the stationary contact 8, and the circuit is connected.

[0070] After the positive pulse is de-energized, the magnetic field of the coil frame 2 disappears, and the two permanent magnets 42 inside the magnet assembly 4 generate permanent magnet holding force to lock the swing position of the movable seat 41; at the same time, the limiting block 44 and the self-locking push rod 7 are locked together, and the U-shaped groove wraps the limiting flat spring assembly 10 to form a mechanical self-locking structure. The coil does not need to be continuously energized to keep the contacts closed and conductive for a long time.

[0071] The second is the contact disconnection and breaking process:

[0072] A reverse instantaneous pulse current is passed through the coil frame 2, and the coil frame 2 generates a reverse magnetic field, which cancels the original holding magnetic force of the permanent magnet 42 and drives the movable seat 41 of the magnet assembly 4 to swing in the opposite direction.

[0073] The movable seat 41 drives the limit block 44 to pull the self-locking push rod 7 in the opposite direction, making it away from the stationary contact point 8. The self-locking push rod 7 pulls the first guide plate 101 backward through the connecting hole, and the entire flat folding spring assembly 10 retracts synchronously.

[0074] The moving contact 9 and the stationary contact 8 are separated, and the main circuit is cut off; the T-shaped through hole and rectangular hole opened in the third beryllium copper elastic sheet 103 can release the elastic buffer force, weaken the impact caused by the break, and prevent the spring from deforming.

[0075] After the reverse pulse is de-energized, the reverse magnetic field disappears, and the permanent magnet 42 switches to the stable magnetic force of the disconnected state. Combined with the double limiting structure of the limit block 44 and the self-locking push rod 7, the contact is stably kept open. The entire switching process can be completed with only a short power supply.

[0076] Thirdly, the short-circuit impulse protection process:

[0077] When the line encounters a 10kA short-circuit current impact, all components work together to prevent contact welding, structural deformation and failure.

[0078] The flat-folding spring assembly 10 adopts a scissor-differential double-contact structure. The short-circuit current will generate an electric repulsive force that drives the moving and stationary contacts 8 to separate. After being subjected to the force, the first guide plate 101, the second guide plate 102, and the third beryllium copper elastic plate 103 will retract inward. The original repulsive force that separates the contacts will be transformed into an additional clamping force between the moving and stationary contacts 8, preventing the contacts from springing open and generating an electric arc weld. The first guide plate 101, the second guide plate 102, and the third beryllium copper elastic plate 103 are provided with protrusions along the length direction, which effectively improves their longitudinal bending resistance and resists the bending deformation of the spring caused by the short-circuit impact.

[0079] The placement column of the moving spring seat 11 and the placement groove of the fixed base 1 together form a multi-point rigid constraint on the flat spring assembly 10, so that the entire spring assembly will not experience lateral or longitudinal displacement during the high current impact process.

[0080] The U-shaped second drive groove of the self-locking push rod 7 completely encloses the flat-folding spring assembly 10. The limiting block 44 and the reinforcing rib of the self-locking push rod 7 are tightly engaged. Combined with the permanent magnet holding force of the permanent magnet 42 in the magnet assembly 4, a double locking structure is formed to firmly fix the entire transmission mechanism. Even after multiple 4.5kA short-circuit impacts or long-term equipment vibration, the magnet assembly 4, the self-locking push rod 7, and the flat-folding spring assembly 10 will not loosen or shift. After the impact, the relay can still complete the opening and closing action normally, which meets the IEC62055-31UC4 level test standard.

[0081] The fixed base 1 adopts a partitioned layout design. The electric arc and high temperature generated in the first space where the contacts are located will not be conducted to the coil frame 2 and the magnet assembly 4 in the second space. This can not only prevent the coil insulation layer from burning and the permanent magnet 42 from being demagnetized by heat, but also isolate the coil magnetic field from interfering with the current carrying capacity of the main circuit, thus improving the overall high temperature resistance and electromagnetic interference resistance of the product.

[0082] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A magnetic latching relay with a self-locking structure, characterized in that, include: A fixed base and a movable spring seat detachably connected to the fixed base, wherein the movable spring seat divides the fixed base into two spaces with different areas, wherein the smaller area is the first space and the other is the second space; A stationary spring seat, disposed in a fixed base and located within the first space, a stationary contact disposed on the stationary spring seat, and a flat-folded spring assembly located within the first space; The coil assembly and the self-locking assembly connected to the coil assembly are both located in the second space, and the self-locking assembly abuts against the flat spring assembly.

2. A magnetic latching relay with a self-locking structure according to claim 1, characterized in that: The fixed base is provided with a placement groove, one end of the movable spring seat is located in the placement groove, the movable spring seat is provided with multiple placement posts, and the flat folding spring assembly is provided with multiple placement holes adapted to the placement posts; The flat-folding spring assembly is sleeved on the placement post through the placement hole and is located in the placement groove with the placement post.

3. A magnetic latching relay with a self-locking structure according to claim 1, characterized in that: The flat-folding spring assembly is provided with a first guide plate, a second guide plate, and a third beryllium copper elastic plate in sequence from the stationary spring seat to the moving spring seat, as well as a moving contact for connecting the first guide plate, the second guide plate, and the third beryllium copper elastic plate.

4. A magnetic latching relay with a self-locking structure according to claim 3, characterized in that: The first guide plate, the second guide plate, and the third beryllium copper elastic plate are all elongated strips, and each of them has a protrusion along its length. Both the first and second guide vanes have Z-shaped through holes along their length, and the extension line of one end of the Z-shaped through hole passes through the midpoint of the width direction of the guide vane. The first guide plate is also provided with a first bending area, which bends toward the stationary contact point and abuts against the self-locking component.

5. A magnetic latching relay with a self-locking structure according to claim 4, characterized in that: The third beryllium copper elastic sheet is provided with a T-shaped through hole and a rectangular hole communicating with the through hole; The free end of the third beryllium copper elastic sheet is pre-set with a second bending area, which is closer to the moving contact. The third beryllium copper elastic sheet abuts against the self-locking assembly.

6. A magnetic latching relay with a self-locking structure according to claim 5, characterized in that: The self-locking component includes a self-locking push rod; The self-locking push rod includes a rod body, an actuator seat disposed at one end of the rod body, and a drive seat disposed at the other end of the rod body; The actuator is provided with a first drive slot, and the drive seat is provided with a second drive slot; The first drive groove has a C-shaped structure, the second drive groove has a U-shaped structure, the bottom of the first drive groove is also provided with a reinforcing rib, and the drive seat is also provided with a connection hole communicating with the second drive groove. The first bending area extends through the connecting hole; The first guide vane, the second guide vane, and the third beryllium copper elastic plate are located in the second drive groove.

7. A magnetic latching relay with a self-locking structure according to claim 6, characterized in that: The coil assembly includes a coil frame disposed on the fixed base, a multi-turn coil sleeved on the coil frame, at least two contact seats connected to the fixed base, and a swing member disposed on the fixed base.

8. A magnetic latching relay with a self-locking structure according to claim 7, characterized in that: The swinging component includes a movable seat movably connected to the fixed base, two permanent magnets disposed on the movable seat, a drive seat disposed on the movable seat, and a limiting block disposed on the drive seat.

9. A magnetic latching relay with a self-locking structure according to claim 8, characterized in that: The movable seat and the permanent magnet form an H-shaped structure, and the free end of the contact seat is located at the upper and lower ends of the H-shaped structure.

10. A magnetic latching relay with a self-locking structure according to claim 8, characterized in that: The limiting block is located in the first driving groove, and the limiting block has a recessed area near the bottom of the first driving groove. The reinforcing rib is located in the recessed area of ​​the limiting block.

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