Magnetic latching relay

Abstract

The utility model discloses a magnetic latching relay, which comprises a base, a shell, an electromagnetic assembly, an armature, a movable spring assembly, a static spring assembly and the like, the movable spring assembly comprises a pushing card and two movable spring sheets arranged side by side, two ends of each movable spring sheet are respectively provided with a movable contact and a pressure spring, the static spring assembly comprises two static spring sheets, each static reed is provided with two static contacts, the two static contacts respectively correspond to the movable contacts at the same axial end parts of the two movable reeds, and when the movable reed assembly moves to be close to the static reed assembly, each movable contact is in contact with the corresponding static contact to conduct a circuit; when the movable spring assembly moves away from the static spring assembly, each movable contact is separated from the corresponding static contact to disconnect the circuit, and meanwhile, the end part of the pressure spring is driven to abut against the inner wall of the base to generate compression deformation to form an elastic reaction force, and the direction of the elastic reaction force is opposite to the moving direction of the movable spring assembly away from the static spring assembly. The improved structure has the advantages of being small in size, large in gap, low in temperature rise, reliable in structure and capable of improving action voltage of a product and the like.

Description

Technical Field

[0001] This utility model relates to a relay in electronic components, specifically a magnetic latching relay. Background Technology

[0002] Currently, magnetic latching relays are widely used in charging piles. However, with the increasing standardization and safety requirements of the charging pile industry, higher requirements are being placed on the electrical clearance of magnetic latching relays. For example, the electrical clearance between contacts in a system with a rated insulation voltage of 1000VDC must be greater than 4mm. However, most mainstream magnetic latching relays on the market currently adopt a single-break contact structure, where a moving spring contacts one of each of two stationary springs through its two moving contacts. If the electrical clearance of a single-break contact magnetic latching relay is increased, the corresponding travel distance needs to be increased, thus requiring a further increase in driving force. Consequently, the size and cost will also increase significantly, making it less acceptable to the market. At the same time, after the moving spring of an existing magnetic latching relay causes its moving contact to disengage from the stationary contact of the stationary spring, breaking the circuit, if it is necessary to reconnect the moving and stationary contacts, There are often issues with the movement of the moving spring, which can significantly affect the operating voltage of the product. Furthermore, most existing moving spring assemblies use a multi-piece stacked structure. To preserve the elasticity of the moving spring, its current-carrying cross-sectional area is generally small, only about half that of the stationary spring, resulting in relatively high temperature rise and difficulty meeting fast charging requirements. Finally, the moving spring assembly needs to be driven to reciprocate within the base to allow the moving and stationary contacts to make contact and conduct electricity or disconnect and disconnect power. Additionally, the moving spring itself needs to exhibit a certain elastic displacement when the moving and stationary contacts make contact to ensure better contact between the moving and stationary contacts. However, these components lack corresponding guiding designs during movement, leading to incomplete movement in actual use, and in severe cases, even jamming due to deviation from the movement trajectory, thus greatly affecting the reliability of the structure. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a magnetic latching relay that is small in size, has a large gap, low temperature rise, can improve the operating voltage of the product and ensure the reliability of the structure.

[0004] The technical problem of this utility model is solved by the following technical solution:

[0005] A magnetic latching relay includes a base and a housing enclosing the base. The base houses an electromagnetic component, an armature, a moving spring assembly, and a stationary spring assembly. The electromagnetic component drives the moving spring assembly to reciprocate via the armature. The moving spring assembly includes a push clip and two moving spring plates arranged side-by-side within a mounting frame of the push clip. Each moving spring plate has moving contacts at both ends facing the stationary spring assembly, and each moving contact has a compression spring on its back facing away from the stationary spring assembly. The stationary spring assembly includes two stationary spring plates, each with two stationary contacts, corresponding to the moving contacts at the same axial end of the two moving spring plates. When the moving spring assembly moves closer to the stationary spring assembly, it causes each moving contact to contact its corresponding stationary contact, thus completing the circuit. When the moving spring assembly moves away from the stationary spring assembly, it causes each moving contact to disengage from its corresponding stationary contact, thus breaking the circuit. Simultaneously, the compression spring end abuts against the inner wall of the base, generating a compressive deformation and forming an elastic reaction force. The direction of this elastic reaction force is opposite to the direction of movement of the moving spring assembly away from the stationary spring assembly.

[0006] Each of the moving springs is provided with a limiting groove on both sides. The limiting groove can slide to fit the side of the mounting frame and guide the moving contact on the moving spring to accurately contact the stationary contact.

[0007] Each of the moving reeds is equipped with a spring, which elastically pushes the reed and causes each moving contact to elastically contact the corresponding stationary contact to conduct the circuit.

[0008] One end of the compression spring is fixed to the back of the moving contact, and the other end is tilted upward to form an elastic end. The elastic end abuts against the inner wall of the base to generate compression deformation and form an elastic reaction force.

[0009] The outer surface of the base is provided with an auxiliary contact, which includes an auxiliary stationary spring, an auxiliary moving spring, and an elastic spring plate. The auxiliary stationary spring and the auxiliary moving spring are both set on the base. One end of the elastic spring plate is fixed on the auxiliary moving spring, and the other end is inserted into the positioning groove of the armature. The armature drives the moving spring assembly to move back and forth, and causes the elastic spring plate to contact or disengage from the auxiliary stationary spring.

[0010] The push card is provided with a connection hole for connecting to the armature.

[0011] The mounting frame is equipped with a separating rib that separates the two moving spring pieces.

[0012] The base is provided with a guide groove, and the push card is fitted in the guide groove and moves back and forth along the guide groove.

[0013] The guide groove is provided with front high plates on both sides of the front part and rear high plates on both sides of the rear part, and the front and rear high plates restrict the push card from tilting and disengaging from the guide groove.

[0014] An arc-extinguishing magnet is provided on the outer side of the moving contact that contacts the stationary contact, and the surface of the arc-extinguishing magnet is covered with a magnetic shielding sheet.

[0015] Compared with the prior art, this utility model mainly consists of a moving spring assembly composed of a push card and two moving spring pieces arranged side by side in the mounting frame of the push card. Each moving spring piece has moving contacts at both ends facing the stationary spring assembly, and each moving contact has a compression spring on its back facing away from the stationary spring assembly. The stationary spring assembly consists of two stationary spring pieces, each with two stationary contacts, which correspond to the moving contacts at the same axial end of the two moving spring pieces. In this way, when the moving spring assembly moves closer to the stationary spring assembly, it can drive each moving contact to contact the corresponding stationary contact to conduct the circuit; when the moving spring assembly moves away from the stationary spring assembly, it can drive each moving contact to disengage from the corresponding stationary contact to disconnect the circuit. Since the moving and stationary contacts adopt a double-break contact structure with two sets of parallel contact, it can achieve the desired circuit without increasing the actuation force. While maintaining a small size and low cost without increasing driving force, the system also increases electrical clearance and current-carrying area to reduce heat generation. In particular, the parallel connection of two sets of contacts can create current shunting, reducing the current of a single set of contacts and further reducing temperature rise. At the same time, the unique compression spring design on the moving spring allows the end of the compression spring to compress against the inner wall of the base when the circuit is disconnected, generating an elastic reaction force. The direction of this elastic reaction force is opposite to the direction of movement of the moving spring assembly away from the stationary spring assembly, playing a counter-force role to match the suction force, thereby greatly improving the product's operating voltage. In addition, the design of guide grooves in the base for reciprocating movement guidance and the design of limiting grooves on both sides of the moving spring can slide and guide the moving contact to accurately contact the stationary contact. These structural additions can ensure the reliability of the product. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model in a contact conductive state.

[0017] Figure 2 This is a schematic diagram of the structure of the present invention in the state of being disconnected from power.

[0018] Figure 3 This is an exploded perspective view of the present invention.

[0019] Figure 4 This is a schematic diagram of the structure in which the electromagnetic component is driven by the armature to form a linkage with the moving spring assembly and auxiliary contacts.

[0020] Figure 5 This is a magnified view of point A in area 4.

[0021] Figure 6 This is a schematic diagram of the mating structure of the moving spring assembly and the stationary spring assembly.

[0022] Figure 7 for Figure 6 A three-dimensional image.

[0023] Figure 8 This is a schematic diagram of the placement structure of the arc-extinguishing magnet.

[0024] Figure 9 This is a schematic diagram of the moving spring assembly.

[0025] Figure 10 This is a schematic diagram of the moving spring.

[0026] Figure 11 This is a schematic diagram of the base structure.

[0027] Figure 12 This is a schematic diagram of the structure of the base of this utility model, which is covered by an outer shell. Detailed Implementation

[0028] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0029] like Figures 1-12 As shown, 1. Base, 11. Guide groove, 12. Front high plate, 13. Rear high plate, 2. Electromagnetic assembly, 21. Coil frame, 22. Enamelled coil, 23. Pin, 24. Iron core, 25. Yoke, 3. Armature, 31. Drive rod, 32. Positioning groove, 4. Moving spring assembly, 41. Push clip, 411. Mounting frame, 412. Connecting hole, 413. Isolation rib, 42. Moving spring, 421. Limiting groove, 422. Positioning post, 43. Moving contact, 44. Compression spring, 45. Spring, 5. Stationary spring assembly, 51. Stationary spring, 52. Stationary contact, 61. Auxiliary stationary spring, 62. Auxiliary moving spring, 63. Elastic spring plate, 64. Auxiliary stationary contact, 65. Auxiliary moving contact, 7. Arc extinguishing magnet, 71. Magnetic shielding sheet, 8. Fixing frame, 9. Housing.

[0030] A magnetic latching relay, such as Figure 12 As shown, it can be widely used in charging piles as an indispensable and important protective electronic component. It can control the on / off state of each module in the charging pile power module to output different charging power, and at the same time, it can effectively play the role of electrical isolation.

[0031] The magnetic latching relay includes a base 1 and a housing 9. The base 1 houses an electromagnetic assembly 2, an armature 3, a moving spring assembly 4, and a stationary spring assembly 5, and these four components are arranged in a manner that... Figure 1 , Figure 2 As shown, the components are installed sequentially from right to left, and the base 1 and the four components on the base are all enclosed within the outer casing 9.

[0032] The electromagnetic component 2 typically consists of a coil frame 21, an enameled coil 22, a pin 23 for energizing the enameled coil, an iron core 24 that generates electromagnetic attraction, and a pair of yokes 25 that provide positive and negative magnetic attraction forces. The armature 3 is mounted in the base 1 by a fixing frame 8 and is driven by the positive and negative magnetic attraction forces on the pair of yokes 25 to form a reciprocating oscillation. In this embodiment, for example... Figure 1 , Figure 2 As shown, since the electromagnetic component 2 is located on the right side of the armature 3, the armature is driven by the electromagnetic component 2 to form a left-right reciprocating swing. Usually, the armature 3 is driven to reciprocate left and right by the electromagnetic component 2 applying a positive pulse or a reverse pulse. The top of the armature is provided with a drive rod 31 and the bottom is provided with a positioning groove 32.

[0033] The described moving spring assembly 4, as Figure 9 As shown, it includes a push card 41 and two movable springs 42 arranged side by side in the mounting frame 411 of the push card.

[0034] The push card 41 is provided with a connection hole 412, that is Figure 1 As shown, a connecting hole 412 is provided at the right end of the push card 41. The connecting hole is directly fitted onto the drive rod 31 at the top of the armature 3. Therefore, after the electromagnetic component 4 drives the armature 3 to swing left and right, the armature can drive the moving spring component 4 to move left and right.

[0035] Meanwhile, the base 1 is also provided with a guide groove 11 for mounting the push card 41. The push card can move back and forth along the guide groove 11 to avoid trajectory deviation, thereby making the contact more reliable. The front two sides of the guide groove are provided with front high plates 12 and the rear two sides are provided with rear high plates 13. The front and rear high plates can also prevent the push card 41 from tilting and leaving the guide groove 11, thereby improving the smoothness of operation and the reliability of the structure.

[0036] The mounting frame 411 shall be provided with an isolation rib 413 to separate the two moving springs 42. This rib can prevent the movement of the two moving springs 42 from interfering with each other, and at the same time enhance the structural strength of the push card 41.

[0037] In this embodiment, the movable spring 42 is a rectangular thin sheet. Therefore, both movable springs need to be laid flat simultaneously and arranged side by side within the mounting frame 411. At this time, the middle parts of both movable springs 42 are supported within the mounting frame 411, while both ends of both movable springs 42 extend from the sides of the mounting frame 411. Figure 1As shown, when the push card is in a horizontal position, the upper and lower ends of the two moving spring pieces 42 extend from the upper and lower sides of the mounting frame 411, respectively. Each moving spring piece 42 has moving contacts 43 at both ends facing the stationary spring assembly 5, effectively forming a bridge-type contact mounting structure. Each moving contact 43 has a compression spring 44 on its back facing away from the stationary spring assembly 5, with one end of the compression spring fixed to the back of the moving contact 43. Figure 1 The right side of the movable spring shown has one end that curves upward to form an elastic end.

[0038] Each movable spring 42 is provided with a limiting groove 421 on both sides. The cross-section of the limiting groove is semi-circular and located exactly in the middle of the movable spring 42. The movable spring can be slidably mounted on the side of the mounting frame 411 and the isolation rib 413 through the limiting grooves 421 on both sides, and can guide the movable contact 43 on the movable spring 42 to accurately contact the stationary contact 52, reduce the offset of the contact position, that is, prevent the movable spring 42 from displacing in the length direction during the operation, and ensure the reliability of the product.

[0039] Each movable spring plate 42 is equipped with a spring 45. The two ends of the spring elastically push against the positioning post 422 and the mounting frame 411 in the middle of the movable spring plate 42, so that the movable spring plate 42 can always elastically push against it under normal conditions. Its function is to enable the movable spring assembly 4 to drive the movable contact 43 on the movable spring plate 42 to elastically contact the stationary contact 52 on the stationary spring plate 51 to conduct the circuit, increase the contact stability between the movable and stationary contacts, and in particular, it can cooperate with the design structure of the limiting groove 421 to further ensure the accuracy of the contact position.

[0040] The stationary spring assembly 5 includes two stationary spring plates 51, each with two stationary contacts 52. These two stationary contacts correspond to the moving contacts 43 at the same axial end of the two moving spring plates 42, respectively. Figure 7 As shown, the moving contact 43 at one end of the two moving springs 42, that is, the two moving contacts in total, correspond exactly to the two stationary contacts 52 on one stationary spring 51. The moving contact 43 at the other end of the two moving springs 42, that is, the two moving contacts in total, correspond exactly to the two stationary contacts 52 on the other stationary spring 51.

[0041] In this way, when the moving spring assembly 4 moves closer to the stationary spring assembly 5, it can cause each moving contact to contact the corresponding stationary contact and conduct the circuit; when the moving spring assembly 4 moves away from the stationary spring assembly 5, it can cause each moving contact to disengage from the corresponding stationary contact and disconnect the circuit.

[0042] Obviously, this utility model adopts a unique double-break contact structure with two sets of parallel contacts for the moving and stationary contacts. Therefore, it can increase the electrical clearance and increase the current-passing area to reduce heat generation without increasing the operating stroke, driving force, small size and low cost. In particular, the parallel connection of the two sets of contacts can form a current shunt, reduce the current of a single set of contacts, and further reduce the temperature rise.

[0043] Meanwhile, the unique compression spring 44 design on the moving spring 42 allows the end of the compression spring, i.e. the elastic end, to be driven to abut against the inner wall of the base to generate compression deformation and form an elastic reaction force when the circuit is disconnected. The direction of this elastic reaction force needs to be opposite to the direction of movement of the moving spring assembly 4 away from the stationary spring assembly 5, so as to play a reaction force role to match the suction force, thereby greatly improving the product's operating voltage.

[0044] The outer side of the moving contact 43 that contacts the stationary contact 52, that is, the... Figure 8 As shown, arc-extinguishing magnets 7 are provided on both the upper and lower sides where the moving contact and the stationary contact are in contact. This is because, according to the Lorentz force on electrons in a magnetic field, the arc will be stretched and the energy will be reduced. Therefore, adding arc-extinguishing magnets can enhance the breaking capacity and make the arc easier to extinguish. Moreover, the non-polar arc-extinguishing design also ensures the ability to break forward and reverse currents. The surface of the arc-extinguishing magnet 7 is covered with a magnetic shielding sheet 71.

[0045] The outer surface of the base 1 is provided with auxiliary contacts, which can, as Figure 4 As shown, it forms a linkage with the moving spring assembly 4. The auxiliary contact includes an auxiliary stationary spring 61, an auxiliary moving spring 62, and an elastic spring plate 63. The auxiliary stationary spring and the auxiliary moving spring are both set on the base 1. One end of the elastic spring plate 63 is fixed on the auxiliary moving spring 61, and the other end is inserted into the positioning groove 32 at the bottom of the armature 3. Therefore, when the armature swings left and right to drive the moving spring assembly 4 to move back and forth, it can simultaneously drive the elastic spring plate 63 to contact or disengage from the auxiliary stationary spring 61. Usually, an auxiliary stationary contact 64 is provided on the auxiliary stationary spring, and an auxiliary moving contact 65 is provided on the elastic spring plate 63. The reliability of the contact or disengagement action is ensured by the auxiliary moving contact 64 and the auxiliary stationary contact 65.

[0046] The purpose of designing auxiliary contacts is that the power modules in the existing charging pile are designed in parallel, making it difficult to determine the on / off state of each power module through high voltage. Therefore, auxiliary contacts that are linked to the main contacts are designed so that the status of the magnetic latching relay can be fed back by checking the auxiliary contact signal, thereby determining the on / off state of each power module and ensuring safety in use.

[0047] The embodiments described above are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A magnetic latching relay, comprising a base (1) and a housing (9) enclosing the base; wherein the base (1) is provided with an electromagnetic assembly (2), an armature (3), a moving spring assembly (4), and a stationary spring assembly (5), wherein the electromagnetic assembly (2) drives the moving spring assembly (4) to reciprocate via the armature (3), characterized in that: The moving spring assembly (4) includes a push card (41) and two moving spring pieces (42) arranged side by side in the mounting frame (411) of the push card. Each moving spring piece has a moving contact (43) facing the stationary spring assembly (5) at both ends, and a compression spring (44) facing away from the stationary spring assembly (5) is provided on the back of each moving contact. The stationary spring assembly (5) includes two stationary spring plates (51), each stationary spring plate is provided with two stationary contacts (52), and the two stationary contacts (52) correspond to the moving contacts (43) at the same axial end of the two moving spring plates (42); When the moving spring assembly (4) moves closer to the stationary spring assembly (5), it causes each moving contact to contact the corresponding stationary contact and conduct the circuit; when the moving spring assembly (4) moves away from the stationary spring assembly (5), it causes each moving contact to disengage from the corresponding stationary contact and disconnect the circuit. At the same time, it also causes the end of the compression spring (44) to abut against the inner wall of the base to generate compression deformation and form an elastic reaction force. The direction of this elastic reaction force is opposite to the direction of movement of the moving spring assembly (4) away from the stationary spring assembly (5).

2. A magnetic latching relay according to claim 1, characterized in that Each movable spring (42) is provided with a limiting groove (421) on both sides. The limiting groove can slide to the side of the mounting frame (411) and guide the movable contact (43) on the movable spring (42) to accurately contact the stationary contact (52).

3. A magnetic latching relay according to claim 1, characterized in that Each of the moving springs (42) is provided with a spring (45), which elastically pushes the spring (42) and causes each moving contact to elastically contact the corresponding stationary contact to conduct the circuit.

4. A magnetic latching relay according to claim 1, characterized in that One end of the compression spring (44) is fixed to the back of the moving contact (43), and the other end is raised to form an elastic end. The elastic end abuts against the inner wall of the base to generate compression deformation and form an elastic reaction force.

5. A magnetic latching relay according to claim 1, wherein The outer surface of the base (1) is provided with auxiliary contacts, which include an auxiliary stationary spring (61), an auxiliary moving spring (62) and an elastic spring plate (63). The auxiliary stationary spring (61) and the auxiliary moving spring (62) are both set on the base (1). One end of the elastic spring plate (63) is fixed on the auxiliary moving spring (62) and the other end is inserted into the positioning groove (32) of the armature (3). The armature drives the moving spring assembly (4) to move back and forth, and drives the elastic spring plate (63) to contact or disengage from the auxiliary stationary spring (61).

6. A magnetic latching relay according to claim 1, wherein The push card (41) is provided with a connection hole (412) for connecting to the armature (3).

7. A magnetic latching relay according to claim 1, wherein The mounting frame (411) is provided with a separating rib (413) that separates the two moving springs (42).

8. A magnetic latching relay according to claim 1, wherein The base (1) is provided with a guide groove (11), and the push card (41) is fitted in the guide groove (11) and moves back and forth along the guide groove.

9. A magnetic latching relay according to claim 8, wherein The guide groove (11) has a front high plate (12) on both sides of the front part and a rear high plate (13) on both sides of the rear part. The front and rear high plates restrict the push card (41) from tilting and disengaging from the guide groove (11).

10. A magnetic latching relay according to claim 1, wherein An arc-extinguishing magnet (7) is provided on the outer side of the moving contact (43) that contacts the stationary contact (52), and the surface of the arc-extinguishing magnet is covered with a magnetic shielding sheet (71).

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