An electromagnetic relay

Abstract

The utility model discloses an electromagnetic relay, and the moving spring part of its contact part includes moving spring sheet, moving spring lead-out sheet and the moving contact of being established on moving spring sheet, and moving spring lead-out sheet is established in the thickness direction of moving spring sheet and deviates from the side of moving contact, and the current direction of both is opposite, the armature of magnetic circuit part is swingably arranged at the mouth of yoke, and the armature includes the first side and the second side of the first angle setting formed from its swing branch point, and the first side is equipped with the beating surface for suction, and the second side extends along the side of moving spring sheet and moving spring lead-out sheet connecting point, and the second side end is connected moving spring sheet through push card, and the connecting position of push card relative to moving spring sheet can be changed through adjusting the length of second side, thereby adjusting the size of the contact gap of contact part, and with the length increase of second side, the contact gap increases. The utility model provides the structural basis for realizing big contact gap, and makes contact part can realize big contact gap according to actual need.

Description

Technical Field

[0001] This utility model relates to the field of relay technology, and in particular to an electromagnetic relay. Background Technology

[0002] With the rapid development of new energy fields such as photovoltaic power generation, wind power, hydropower, and nuclear power, the safety of power supply charging and discharging has become a focus of industry attention. As a key switching device in the charging and discharging circuit, the sufficient size of the contact gap of the relay directly affects the safety and reliability of the system, and has become a core indicator highly valued by major power supply manufacturers.

[0003] However, a significant drawback of commonly available relay products is their generally small contact gap, which makes it difficult to meet the requirements of high safety standards. To address this issue, it is typically necessary to use multiple relays connected in series, or to select larger, higher-specification relay solutions to achieve the required contact gap. This approach not only increases system complexity and cost but also presents new challenges in terms of space utilization and energy efficiency optimization. Utility Model Content

[0004] This utility model addresses the technical problems existing in the prior art by providing an electromagnetic relay. Through structural optimization, it provides a structural basis for achieving a large contact gap in the contact part, enabling the contact part to achieve a large contact gap according to actual needs, thereby meeting the application requirements of high safety standards.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: an electromagnetic relay, including a magnetic circuit part, a contact part, and a pusher. The contact part includes a cooperating moving spring part and a stationary spring part; the moving spring part includes a moving spring plate, a moving spring lead plate, and a moving contact provided on the moving spring plate. The moving spring lead plate is located in the thickness direction of the moving spring plate and on the side opposite to the moving contact, and the current directions of the two are opposite; the magnetic circuit part includes a yoke and an armature. The armature is oscillatingly disposed at the knife edge of the yoke, and the armature includes a first side and a second side extending from its oscillation fulcrum and arranged at an angle. The first side is provided with a snapping surface for attraction, and the second side extends along the direction of the connection point between the moving spring plate and the moving spring lead plate. The end of the second side is connected to the moving spring plate through a pusher. By adjusting the length of the second side, the connection position of the pusher relative to the moving spring plate can be changed, thereby adjusting the size of the contact gap of the contact part. As the length of the second side increases, the contact gap increases.

[0006] In a preferred embodiment, the connection position of the push card relative to the movable spring is set within the range of [1 / 2, 4 / 5] of the vertical distance between the swing fulcrum of the armature and the connection point between the movable spring and the movable spring lead-out piece.

[0007] In a preferred embodiment, the movable spring is rigid, one end of the movable spring is rotatably connected to one end of the movable spring lead-out piece, and a flexible conductive element is connected between the two; the other end of the movable spring is provided with the movable contact; a contact spring is installed on the side of the movable spring facing away from the movable contact, and the push card is also connected to the contact spring so that the movable spring can be pushed towards the stationary spring portion by pushing the contact spring, thereby generating overtravel.

[0008] In a preferred embodiment, the device further includes an elastic element that cooperates with the movable spring to compress or stretch the elastic element to store energy when the movable spring swings in the contact closing direction, and releases the stored energy when the movable spring swings in the contact opening direction; the device also includes a base, on which the magnetic circuit portion, the movable spring lead-out portion, and the stationary spring portion are respectively mounted; the elastic element is mounted on the base.

[0009] In a preferred embodiment, the elastic element is a reaction spring, which is located on the side of the movable spring away from the movable spring lead-out plate, and is in abutting or clearance fit with the movable spring.

[0010] In a preferred embodiment, the reaction spring is bent and includes an installation section above the bend line and an inclined section below the bend line. The installation section is installed on the base, and the inclined section is inclined toward the side closer to the moving spring. The end of the inclined section is rounded and abuts against the moving spring.

[0011] In a preferred embodiment, the armature is connected to the armature by a limiting spring to keep the armature at the cutting edge.

[0012] In a preferred embodiment, the base is provided with a contact cavity for accommodating the contact portion and a magnetic circuit cavity for accommodating the magnetic circuit portion. An insulating partition is provided between the contact cavity and the magnetic circuit cavity, which separates the contact cavity and the magnetic circuit cavity. The insulating partition is provided with a through groove corresponding to the push card, which connects the magnetic circuit cavity and the contact cavity, so as to allow the push card to be moved and / or guided. The elastic element is installed in the contact cavity.

[0013] In a preferred embodiment, the base sidewall is provided with a first opening for the contact portion to laterally enter the contact cavity and a second opening for the magnetic circuit portion to laterally enter the magnetic circuit cavity; the first opening and the second opening are located on different sides of the base.

[0014] In a preferred embodiment, the first opening and the second opening are oriented in opposite directions, and the orientations of the first opening and the second opening are perpendicular to the distribution directions of the contact cavity and the magnetic circuit cavity, respectively.

[0015] In a preferred embodiment, the inner wall of the magnetic circuit cavity is provided with at least one first limiting groove corresponding to the yoke, and the portion of the yoke corresponding to the first limiting groove is inserted into the first limiting groove along the direction in which the magnetic circuit portion enters the magnetic circuit cavity; the outer side of the base is provided with at least one fixing groove leading to the magnetic circuit cavity, and the yoke is provided with a first limiting protrusion corresponding to the fixing groove, the first limiting protrusion being inserted into and fixed with adhesive; an adhesive groove is formed inside the fixing groove.

[0016] In a preferred embodiment, the through groove is a notch groove, and the orientation of its groove opening is consistent with the orientation of the second opening; the side wall of the base opposite to the first opening is provided with an avoidance opening corresponding to the push card, which connects the contact cavity and the through groove.

[0017] In a preferred embodiment, the side wall of the base opposite to the first opening is further provided with an auxiliary opening communicating with the contact cavity at the contact point of the contact portion, for heat dissipation and / or to avoid splashes generated when the contact portion is disconnected; the auxiliary opening is located below the avoidance opening and the two are vertically connected, or the base is provided with a reinforcing rib between the auxiliary opening and the avoidance opening, the reinforcing rib separating the auxiliary opening and the avoidance opening.

[0018] In a preferred embodiment, the second end of the armature is provided with a second limiting protrusion on one side in the width direction, and the push card sidewall is provided with a second limiting groove corresponding to the second limiting protrusion. The second limiting protrusion is inserted into the second limiting groove along one side in the width direction of the second side of the armature, and the two are in a clearance fit.

[0019] In a preferred embodiment, the push card is provided with a receiving groove corresponding to the second end of the armature. The receiving groove has a second limiting groove and a third opening on two opposite groove sidewalls in the width direction of the second side of the armature. The second end of the armature is inserted into the receiving groove through the third opening, and the two are in clearance fit. The bottom of the receiving groove is provided with a fourth opening to avoid the part below the second end of the armature.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. Because the moving spring part of this utility model adopts a short-circuit resistant structure, and the second side of the armature of the magnetic circuit part extends along the direction of the connection point between the moving spring and the moving spring lead-out piece, and the end of the second side is connected to the moving spring through a push clip, this design allows the connection position of the push clip relative to the moving spring to be changed by adjusting the length of the second side, thereby adjusting the contact gap of the contact part in the open state. Furthermore, as the length of the second side increases, the contact gap increases, thus facilitating the realization of a large contact gap. Therefore, this utility model provides a structural basis for achieving a large contact gap, allowing the contact part to achieve a large contact gap according to actual needs, thereby eliminating the need to connect multiple relays in series or use larger, higher-specification relay solutions, thus simplifying the structure and reducing costs, while meeting the application requirements of high safety standards.

[0022] 2. As a preferred embodiment, this invention also includes an elastic element for providing a reaction force. This design not only meets the functional requirements of rapid disconnection and reset under large contact gap conditions, but also eliminates the need for a spring on the armature to provide the reaction force. This not only helps to achieve miniaturization of the overall structure, but also reduces the resistance during armature movement, making the armature swing smoother. In this way, this invention not only improves the performance and reliability of the electromagnetic relay, but also simplifies the structure, reduces manufacturing costs, and is suitable for applications with higher safety standards. In particular, the elastic element is preferably a reaction spring, which not only makes installation more convenient, but also significantly reduces the space occupied, thereby facilitating further miniaturization of the relay.

[0023] 3. The base of this utility model is provided with the contact cavity and the magnetic circuit cavity, making the base adopt a frame structure, which allows for a larger creepage distance and electrical clearance between the magnetic circuit part and the contact part. In particular, the first opening of the contact cavity and the second opening of the magnetic circuit cavity are located on different sides of the base, further enhancing the insulation performance between the magnetic circuit part and the contact part.

[0024] 4. As a preferred embodiment, the inner surface of the magnetic circuit cavity is provided with the first limiting groove. This design not only ensures the accurate installation of the magnetic circuit part but also enhances its stability within the magnetic circuit cavity, thereby improving the overall reliability and performance of the device. Furthermore, the outer surface of the base is provided with the fixing groove, which further prevents the magnetic circuit part from moving or loosening within the magnetic circuit cavity, ensuring the stability and reliability of the magnetic circuit part. The adhesive fixing further enhances the connection strength between the fixing groove and the first limiting protrusion, ensuring that it will not loosen due to vibration or other external forces during long-term use.

[0025] 5. The base side wall is also provided with an auxiliary opening that connects to the contact cavity. This auxiliary opening not only helps with heat dissipation, but also effectively avoids splashes generated when the contact part is disconnected, thereby significantly improving the relay's withstand voltage level.

[0026] 6. As a preferred embodiment, this utility model provides reinforcing ribs between the auxiliary opening and the avoidance opening, which effectively avoids the weakening of the strength of the base side wall structure caused by the direct connection between the two, thereby significantly improving the overall strength and rigidity of the base side wall.

[0027] 7. The second end of the armature engages with the second limiting groove of the push card via the second limiting protrusion, effectively limiting their relative movement in the axial direction of the coil frame in the magnetic circuit. This helps maintain the stability of the push card during movement, ensuring consistent contact positions between the moving and stationary contacts, further guaranteeing consistency in overtravel and contact gap. This consistency is crucial for improving the reliability and stability of the product's operation. Furthermore, this design employs a side-insertion fitting method, simplifying the assembly process. More importantly, during installation, a good limiting effect is not achieved through interference fit. This means reduced installation friction between the armature and the push card, reducing plastic debris generation and further improving product quality and durability.

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the electromagnetic relay of the present invention is not limited to the embodiments. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the three-dimensional structure of a utility model, as shown in the embodiment. Figure 1 (Excluding the casing);

[0030] Figure 2 This is a schematic diagram of the three-dimensional structure of a utility model, as shown in the embodiment. Figure 2 (Excluding the casing);

[0031] Figure 3 yes Figure 1 The main view;

[0032] Figure 4 yes Figure 1 Rear view;

[0033] Figure 5 This is an exploded view of the movable spring part of a utility model according to an embodiment;

[0034] Figure 6 This is a three-dimensional structural schematic diagram of the movable spring part of the present invention as an example;

[0035] Figure 7 This is a three-dimensional structural schematic diagram of the magnetic circuit part of an embodiment of a utility model;

[0036] Figure 8 This is a three-dimensional structural schematic diagram of the base of a utility model according to an embodiment;

[0037] Figure 9 This is a front view of the base of the utility model according to embodiment;

[0038] Figure 10 This is a rear view of the base of a utility model according to an embodiment;

[0039] Figure 11 This is a three-dimensional structural diagram of a push card of the present invention, as shown in the embodiment. Figure 1 ;

[0040] Figure 12 This is a three-dimensional structural diagram of a push card of the present invention, as shown in the embodiment. Figure 2 ;

[0041] Figure 13 This is a three-dimensional structural schematic diagram of the armature of a utility model according to an embodiment;

[0042] Figure 14 This is a schematic diagram illustrating the cooperation between the armature and the pusher of a utility model, as described in Embodiment 1.

[0043] Figure 15 This is a schematic diagram illustrating the assembly of the armature, pusher, moving spring, and contact spring of a utility model according to an embodiment.

[0044] Figure 16 This is a schematic diagram illustrating the interaction of the magnetic circuit portion, the push card, and the contact portion of a utility model according to an embodiment.

[0045] Figure 17 This is a schematic diagram showing the interaction between the magnetic circuit section and the push card and contact section in the correct mounting state;

[0046] Figure 18 This is a schematic diagram of the electromagnetic attraction curve of a utility model, as shown in the embodiment.

[0047] Figure 19 This is a three-dimensional structural diagram of the base of this utility model in Embodiment 2. Figure 1 ;

[0048] Figure 20 yes Figure 19 The main view;

[0049] Figure 21 This is a three-dimensional structural diagram of the base of this utility model in Embodiment 2. Figure 2 ;

[0050] Figure 22 yes Figure 21 The main view;

[0051] Figure 23 This is a three-dimensional structural diagram of the electromagnetic relay of this utility model, as shown in Embodiment 2. Figure 1 (Excluding the casing);

[0052] Figure 24 yes Figure 23 The main view;

[0053] Figure 25 This is a three-dimensional structural diagram of the electromagnetic relay of this utility model, as shown in Embodiment 2. Figure 2 (Excluding the casing)

[0054] In the diagram, 1. Magnetic circuit section; 11. Armature; 111. First side; 112. Second side; 113. Second limiting protrusion; 114. Drive section; 12. Yoke; 121 / 122. First limiting protrusion; 13. Coil frame; 14. Coil; 15. Iron core; 16. Limiting spring; 17. Coil lead-out foot; 2. Moving spring section; 21. Moving spring; 211. First lug; 22. Moving spring lead-out piece; 221. Second lug; 222. Lead-out foot; 23. Moving contact; 24. Contact spring; 25. Flexible connector; 26. Shaft; 3. Stationary spring section; 31. Stationary spring; 32. Stationary contact; 4. Push clip; 4 1. Slot; 42. Second limiting slot; 43. Receiving slot; 44. Guide rib; 5. Base; 51. Magnetic circuit cavity; 511. Second opening; 512. First limiting slot; 513. Limiting rib; 514. Fixing slot; 5141. Glue dispensing slot; 52. Contact cavity; 521. First opening; 522. Slot; 53. Insulating partition; 531. Through slot; 532. Insertion hole; 54. Auxiliary opening; 55. Clearance opening; 56. Pin slot; 57. Clearance opening; 58. Reinforcing rib; 6. Reaction spring; 61. Mounting section; 62. Inclined section; 7. Limiting rod; 8. Auxiliary moving spring; 9. Auxiliary stationary spring. Detailed Implementation

[0055] In this utility model, the terms "first," "second," and "third," etc., are used only to distinguish similar objects, not to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. The use of terms such as "upper," "lower," "left," "right," "front," "rear," "inner," "outer," and "top / bottom" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, and is only for the convenience of describing this utility model, not to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the scope of protection of this utility model. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0056] Furthermore, in the description of this utility model, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0057] Please see Figures 1-18 As shown, an electromagnetic relay of this utility model includes a magnetic circuit part 1, a contact part, and a push card 4. The contact part includes a cooperating moving spring part 2 and a stationary spring part 3. The moving spring part 2 adopts a short-circuit resistant structure, which includes a moving spring plate 21, a moving spring lead plate 22, and a moving contact 23 provided on the moving spring plate 21. The moving spring lead plate 22 is located in the thickness direction of the moving spring plate 21 and is on the side opposite to the moving contact 23. The current directions of the two are opposite. The magnetic circuit part 1 includes a yoke 12 and an armature 11. The armature 11 is pivotally disposed at the blade of the yoke 12. The armature 11 includes a first side 111 and a second side 112 extending from its pivot point and disposed at an angle. The first side 111 is provided with a snapping surface for attraction. The second side 112 extends along the direction of the connection point between the movable spring 21 and the movable spring lead-out piece 22. The end of the second side 112 (i.e. the end of the second side 112 away from the pivot point) is connected to the movable spring 21 by a push card 4. By adjusting the length of the second side 112, the connection position of the push card 4 relative to the movable spring 21 can be changed, thereby adjusting the size of the contact gap of the contact part. As the length of the second side 112 increases, the contact gap of the contact part increases.

[0058] In this embodiment, both the movable spring 21 and the movable spring lead-out piece 22 are rigid. One end of the movable spring 21 is rotatably connected to one end of the movable spring lead-out piece 22, and a flexible conductive element is connected between one end of the movable spring 21 and one end of the movable spring lead-out piece 22. The movable contact 23 is located at the other end of the movable spring 21. The movable spring 21 rotates relative to the movable spring lead-out piece 22, causing the movable contact 23 to contact or separate from the stationary contact 32 of the stationary spring portion 3. Specifically, one end of the movable spring 21 and one end of the movable spring lead-out piece 22 face upwards, and are therefore referred to as the upper end. The other end of the movable spring 21 and the other end of the movable spring lead-out piece 22 face downwards, and are therefore referred to as the lower end. The flexible conductive element is preferably a flexible wire 25, which is connected between the upper end of the movable spring 21 and the upper end of the movable spring lead-out piece 22 for current conduction and to reduce the force during the rotation of the movable spring 21. The stationary spring portion 3 includes a stationary spring sheet 31 and a stationary contact 32 disposed on the stationary spring sheet 31. The stationary spring sheet 31 is preferably a rigid spring sheet to improve current carrying capacity. The stationary contact 32 corresponds to and engages with the moving contact 23. In other embodiments, the moving spring sheet is a flexible spring sheet, one end of which is connected to one end of the rigid moving spring lead sheet by riveting or welding.

[0059] like Figure 5 , Figure 6 As shown, the upper end of the movable spring 21 is rotatably connected to the movable spring lead-out piece 22 via a rotating shaft 26. Specifically, the upper end of the movable spring 21 is bent at both ends in the width direction toward the same side in the thickness direction to form two first lugs 211, and the upper end of the movable spring lead-out piece 22 is bent at both ends in the width direction toward the same side in the thickness direction to form two second lugs 221. The two first lugs 211 and the two second lugs 221 are respectively provided with shaft holes and are connected together by the rotating shaft 26. The lower end of the movable spring lead-out piece 22 is provided with a lead-out foot 222, which is integrally formed with the movable spring lead-out piece 22, and the two form an approximately 90° angle.

[0060] The magnetic circuit section 1 also includes a coil frame 13, a coil 14 wound around the coil frame 13, and an iron core 15 inserted into a through hole in the coil frame 13. The magnetic circuit section 1 is vertical, meaning the axis of the coil frame of the magnetic circuit section 1 is in the vertical direction. The yoke 12 is inverted L-shaped, with one side of the yoke 12 fitting to the outside of the coil frame 13 and extending downwards, so that one end of the yoke 12 faces downwards and has a knife edge. The other side of the yoke 12 extends horizontally and connects to the upper end of the iron core 15. The angle formed by the first side 111 and the second side 112 of the armature 11 is slightly greater than 90°, making the armature 11 approximately L-shaped. The mating surface of the first side 111 of the armature 11 is used for magnetic attraction with the lower end of the iron core 15, and the second side 112 of the armature 11 extends upwards and fits to the outside of one side of the yoke 12. Therefore, the magnetic circuit section 1 adopts an inverted structure. The angle between the first side 111 of the armature 11 and the lower end face of the iron core 15 can be equivalently converted into the distance that the second side 112 of the armature 11 moves horizontally; this is a first-order amplification. The distance that the second side 112 of the armature 11 moves is formed by the pusher 4 pushing the moving spring 21 to form a movement distance; this is a second-order amplification. Therefore, when the swing angle of the armature 11 remains unchanged, the connection position of the pusher 4 relative to the moving spring 21 can be adjusted by adjusting the length of the second side 112 of the armature 11, thereby adjusting the size of the contact gap. The contact gap refers to the shortest distance between the moving contact 23 and the stationary contact 32 when the contact part is in the open state. The length of the second side 112 refers to the distance from the lower edge of the second side 112 (the swing fulcrum of the armature 11) to the upper edge.

[0061] In a preferred embodiment, the connection position of the push card 4 relative to the movable spring 21 is set within the range of [1 / 2, 4 / 5] of the vertical distance between the swing fulcrum of the armature 11 and the connection point of the movable spring 21 and the movable spring lead-out piece 22 (specifically, the rotation fulcrum of the movable spring 21). This design not only achieves a larger contact gap, but also allows the rotation angle of the armature 11 to be as small as possible. When the armature 11 is in the open state, the air gap in the magnetic circuit is as small as possible, thereby making better use of the characteristics of electromagnetic attraction and air gap, thus avoiding increasing coil power consumption and saving product power consumption. The vertical distance between the swing fulcrum of the armature 11 and the connection point of the movable spring 21 and the movable spring lead-out piece 22 (specifically, the rotation fulcrum of the movable spring 21) refers to the distance from the swing fulcrum of the armature 11 to the connection point of the movable spring 21 and the movable spring lead-out piece 22 (specifically, the rotation fulcrum of the movable spring 21) in the axial direction (i.e., the vertical direction in this embodiment) of the coil frame 13.

[0062] This invention also includes a base 5, on which the magnetic circuit portion 1, the moving spring lead-out piece 22, and the stationary spring piece 31 of the stationary spring portion 3 are respectively mounted. This invention also includes an elastic element that cooperates with the moving spring piece 21. When the moving spring piece 21 swings in the contact closing direction, the elastic element is compressed or stretched to store energy. When the moving spring piece 21 swings in the contact opening direction, the elastic element releases the stored energy, driving the moving spring piece 21 and the armature 11 to reset. Further, the elastic element is independent of the moving spring portion 2 and is specifically mounted on the base 5. In this embodiment, the elastic element is preferably a reaction spring piece 6, located on the side of the moving spring piece 21 opposite to the moving spring lead-out piece 22, with one end of the reaction spring piece 6 in abutment or clearance fit with the moving spring piece 21. Specifically, the reaction spring 6 is bent, including a mounting section 61 above the bend line and an inclined section 62 below the bend line. The mounting section 61 is mounted on the base 5, specifically inserted into a slot 522 on the side wall of the base 5, preferably in a lateral insertion manner. The mounting end 61 and the slot 522 can achieve a stable fit through interference fit or adhesive application. The inclined section 62 is inclined towards the side closer to the moving spring 21, and its end abuts against the moving spring 21. Furthermore, the end of the inclined section 62 has a rounded corner, which abuts against the side of the moving spring 21 with the moving contact 23. The rounded corner design reduces stress concentration during contact, ensuring smoother and more uniform contact between the reaction spring 6 and the moving spring 21. The rounded corner also reduces friction between the reaction spring 6 and the moving spring 21, thereby reducing wear and extending service life. This utility model also includes a housing (not shown in the figure), the bottom of which has an opening and is connected to the base 5, so as to enclose the magnetic circuit part 1 and the contact part in its cavity.

[0063] A contact spring 24 is mounted on the side of the movable spring 21 facing away from the movable contact 23. The pusher 4 is also connected to this contact spring 24, allowing the movable spring 21 to move towards the stationary spring portion 3 by pushing the contact spring 24, thereby generating overtravel and increasing the contact pressure. Specifically, the lower end of the contact spring 24 is riveted to the lower end of the movable spring 21 along with the movable contact 23, and a gap is provided between the upper end of the contact spring 24 and the movable spring 21. Figure 11 As shown, the push card 4 has a through slot 41, and the moving spring 21 and the contact spring 24 are respectively inserted into the slot 41, as shown. Figure 15 As shown. Furthermore, the slot 41 is open at one end in the width direction of the moving spring 21 to facilitate the lateral insertion of the moving spring 21 and the contact spring 24.

[0064] The armature 11 is connected to the armature 11 by a limiting spring 16, so that the armature 11 can be held at the knife edge of the yoke 12 in a swingable manner. Specifically, the limiting spring 16 is roughly L-shaped. One side of the limiting spring 16 is connected (preferably riveted) to the outer side of one side of the yoke 12 and has a hollow hole to avoid the second side 112 of the armature 11. The other side of the limiting spring 16 is connected (preferably riveted) to the side of the first side 111 of the armature 11 that is opposite to the iron core 15.

[0065] The design of the aforementioned elastic element (i.e., the reaction spring 6) not only meets the functional requirements of rapid disconnection and reset under large contact gap conditions, but also eliminates the need for a spring on the armature 11 to provide reaction force. That is, the limiting spring 16 only needs to perform the limiting function, without providing reaction force to drive the armature 11 to reset. This makes the structure and assembly of the limiting spring 16 more convenient and reduces the space requirements of the product. Therefore, this invention not only helps to achieve miniaturization of the overall structure but also reduces the resistance during the movement of the armature 11, making the swing of the armature 11 smoother. In this way, this invention not only improves the performance and reliability of the electromagnetic relay but also simplifies the structure, reduces manufacturing costs, and is suitable for applications with higher safety standards.

[0066] The base 5 has a contact cavity 52 for accommodating the contact portion and a magnetic circuit cavity 51 for accommodating the magnetic circuit portion 1. The contact cavity 52 and the magnetic circuit cavity 51 are distributed horizontally, and an insulating partition 53 is provided between them to separate the contact cavity 52 and the magnetic circuit cavity 51. Furthermore, the side wall of the base 5 has a first opening 521 for the contact portion to laterally enter the contact cavity 52 and a second opening 511 for the magnetic circuit portion 1 to laterally enter the magnetic circuit cavity 51. The first opening 521 and the second opening 511 are located on different sides of the base 5. Therefore, the base 5 of this invention adopts a frame structure, which allows for a larger creepage distance and electrical clearance between the magnetic circuit portion 1 and the contact portion. In particular, the first opening 521 and the second opening 511 being located on different sides of the base 5 further enhances the insulation performance between the magnetic circuit portion 1 and the contact portion.

[0067] In a preferred embodiment, the first opening 521 and the second opening 511 face opposite directions. Furthermore, the orientations of the first opening 521 and the second opening 511 are perpendicular to the distribution directions of the contact cavity 52 and the magnetic circuit cavity 51, respectively. Specifically, the contact cavity 52 and the magnetic circuit cavity 51 are distributed along the length of the base 5, and the first opening 521 and the second opening 511 face opposite directions in the width direction of the base 5. Alternatively, the first opening 521 can be considered located on one side of the base 5 in the width direction of the moving spring 21, and the second opening 511 is located on the other side of the base 5 in the width direction of the moving spring 21. This design allows for a better layout within a limited space, thereby fully utilizing the internal space, reducing the overall size, and making the design more compact and efficient.

[0068] like Figure 1 , Figure 3 and Figure 8As shown, the insulating partition 53 has a through groove 531 corresponding to the push card 4, which connects the magnetic circuit cavity 51 and the contact cavity 52. ​​The through groove 531 is used to make way for and / or guide the push card 4. In this embodiment, the through groove 531 can both make way for the push card 4 and guide the movement of the push card 4. Specifically, the through groove 531 is a notch, and the orientation of its opening is on the same side of the base 5 as the second opening 511. The push card 4 is inserted laterally into the through groove 531, and a limiting rod 6 is connected to the side wall of the insulating partition 53 and / or the base 5 opposite to the first opening 521. The limiting rod 6 is used to restrict the push card 4 from exiting the through groove 531. The limiting rod 6 is roughly U-shaped, with its upper and lower ends inserted into the insertion holes 532 provided in the insulating partition 53, and its middle part extends vertically and stops at the opening of the through groove 531. The side of the push card 4 facing the limiting rod 6 has at least one guide rib 44 extending along its direction of movement. This guide rib 44 separates the side of the push card 4 facing the limiting rod 6 from the limiting rod 6, effectively reducing the contact area between them and thus significantly reducing contact friction. This design effectively avoids the problem of the push card 4 getting stuck due to interference from the limiting rod 6 caused by excessive friction. The side wall of the base 5 opposite to the first opening 521 has a clearance opening 57 corresponding to the push card 4, which connects the contact cavity 52 and the through groove 531, allowing the part of the push card 4 that mates with the moving spring part 2 to enter the contact cavity 52 through the clearance opening 57.

[0069] The aforementioned elastic element (i.e., the reaction spring 6) is installed in the contact cavity 52, specifically on the inner wall surface of the contact cavity 52. ​​For example... Figure 10 As shown, the lateral opening of the slot 522 is positioned opposite to the first opening 521. The reaction spring 6 also enters the contact cavity 52 through the first opening 521 and is laterally inserted into the slot 522. Figure 4 As shown.

[0070] like Figure 2 , Figures 7-10As shown, the inner wall of the magnetic circuit cavity 51 is provided with at least one first limiting groove 512 corresponding to the yoke 12. The portion of the yoke 12 corresponding to the first limiting groove 512 is inserted into the first limiting groove 512 along the direction in which the magnetic circuit portion 1 enters the magnetic circuit cavity 51, so as to precisely limit the position of the magnetic circuit portion 1 in the magnetic circuit cavity 51. Specifically, in this embodiment, there are two first limiting grooves 512, and the two first limiting grooves 512 respectively correspond to the two sides of the yoke 12. The first limiting groove 512 corresponding to one side of the yoke 12 extends in the vertical direction and is surrounded by the limiting ribs 513 provided in the magnetic circuit cavity 51 and the corresponding inner wall surface of the magnetic circuit cavity 51. The first limiting groove 514 corresponding to the other side of the yoke 12 is located at the upper left corner of the magnetic circuit cavity 51 and cooperates with the end of the other side of the yoke 12. Furthermore, the outer side of the base 5 is provided with at least one fixing groove 514 leading to the magnetic circuit cavity 51. The yoke 12 is provided with a first limiting protrusion 121 corresponding to the fixing groove 514. The first limiting protrusion 121 is inserted into the fixing groove 514 and fixed with adhesive. The design of the first limiting groove 512 not only ensures the accurate installation of the magnetic circuit part 1, but also enhances its stability within the magnetic circuit cavity 51, thereby improving the reliability and performance of the overall equipment. The design of the fixing groove 514 can further prevent the magnetic circuit part 1 from moving or loosening within the magnetic circuit cavity 51, ensuring the stability and reliability of the magnetic circuit part 1. The adhesive fixing further enhances the connection strength between the fixing groove 514 and the first limiting protrusion 121, ensuring that it will not loosen due to vibration or other external forces during long-term use.

[0071] In this embodiment, two fixing grooves 514 are provided. One fixing groove 514 leads to the first limiting groove 512 corresponding to one side of the yoke 12, and the other fixing groove 514 leads to the first limiting groove 511 corresponding to the other side of the yoke 12. Correspondingly, two first limiting protrusions 121 are also provided and integrally formed with the yoke 12. Specifically, one first limiting protrusion 121 is located on one side of the yoke 12 in the width direction and is approximately in the middle position; the other first limiting protrusion 121 is located on the other side of the yoke 12 in the width direction and is at the end position, such as... Figure 7 As shown.

[0072] In a preferred embodiment, the contact portion of the side wall of the base 5 opposite to the first opening 521 is further provided with an auxiliary opening 54 communicating with the contact cavity 52, for heat dissipation and / or to avoid splashes generated when the contact portion disconnects. Specifically, the auxiliary opening 54 not only helps with heat dissipation but also effectively avoids splashes generated when the contact portion disconnects, thereby significantly improving the relay's withstand voltage level. The auxiliary opening 54 and the first opening 521 are located on opposite sides of the base 5, enabling convection and further facilitating the dissipation of heat generated by the magnetic circuit 1. The auxiliary opening 54 is located below the aforementioned avoidance opening 57, and the two are vertically connected.

[0073] The bottom wall of the base 5 has lead slots 56 corresponding to the lead-out pins of the contact portion, which are connected to the contact cavity 52 for side insertion of the lead-out pins of the contact portion. One side of the lead slot 56 has an opening, the orientation of which is the same as the orientation of the first opening 521. The lower end of the moving spring lead-out piece 22 has a lead-out pin 222, which is integrally formed with the moving spring lead-out piece 22, and the two form approximately a 90° angle. Specifically, there are two lead slots 56 on the base 1, and each of the two lead slots 56 corresponds to and engages with the lead-out pin 222 of the moving spring lead-out piece 22 and the lead-out portion of the stationary spring piece 31.

[0074] The bottom of the coil frame 13 of the magnetic circuit section 1 is provided with a coil lead-out foot 17 and an auxiliary contact portion. The base 5 is provided with a clearance opening 55 leading to the magnetic circuit cavity 51, corresponding to the auxiliary contact portion and the coil lead-out foot 17. The clearance opening 55 is at least partially located on the side of the magnetic circuit cavity 51 away from the contact cavity 52. ​​Specifically, a portion of the clearance opening 55 is located on the side of the magnetic circuit cavity 51 away from the contact cavity 52, and the remainder is located at the bottom of the magnetic circuit cavity 51. The design of this clearance opening 55 simplifies the structure of the base 5, thereby facilitating the miniaturization design of this utility model.

[0075] The auxiliary contact assembly includes an auxiliary moving spring 8 and an auxiliary stationary spring 9 that cooperate with each other. The auxiliary moving spring 8 is driven by a driving part 114 provided at the tail of the first side 111 of the armature 11 to contact or separate from the auxiliary stationary spring 31. In this embodiment, the driving part 114 is integrally formed with the first side 111 of the armature 11, but it is not limited to this. In other embodiments, the driving part is an insulating part fixed to the armature 11.

[0076] In this embodiment, the insulating partition 53 is integrally formed with the base 5, and the thickness of the insulating partition 53 is 0.75-0.9 mm, with a preferred value of 0.8 mm. This design ensures that the insulating partition 53 has a large thickness, further improving the insulation performance and structural stability between the magnetic circuit part and the contact part.

[0077] As a preferred embodiment, the bottom surface or inner top surface of the magnetic circuit cavity 51 is provided with a limiting boss 515 corresponding to the armature 11 of the magnetic circuit portion 1. Since the magnetic circuit portion 1 has an inverted structure, the limiting boss 515 is located on the bottom surface of the magnetic circuit cavity 51. This design can limit the armature 11 to a certain extent when the product is dropped, thereby reducing the drop amplitude of the armature 11 and reducing the deformation of the limiting spring 16, preventing the limiting spring 16 from becoming unrecoverable due to excessive deformation.

[0078] like Figures 11-14 As shown, the end of the second side 112 of the armature 11 (i.e., the end of the second 112 away from the swing fulcrum of the armature, which is also called the upper end since it faces upwards, hereinafter referred to as the upper end) has a second limiting protrusion 113 on one side in the width direction. The side wall of the push card 4 has a second limiting groove 42 corresponding to the second limiting protrusion 113. The second limiting protrusion 113 is inserted into the second limiting groove 42 along one side of the width direction of the second side 112 of the armature 11, and the two are in clearance fit. The second limiting protrusion 113 and the second side 112 of the armature 11 are integrally formed, and it can be square, cylindrical or similar to cylindrical. Similarly, the second limiting groove 42 can be square or round. Therefore, the second limiting protrusion 113 of the second side 112 of the armature 11 and the second limiting groove 42 of the push card 4 form a hinge structure through the insertion fit, which can effectively limit the relative movement between the armature 11 and the push card 4 in the vertical direction. This helps maintain the smoothness of the push card 4 during movement, ensuring that the contact positions of the moving contact 23 and the stationary contact 32 remain consistent, further guaranteeing consistency in overtravel and contact gap. Furthermore, the second limiting protrusion 113 and the second limiting groove 42 employ a lateral insertion fit, simplifying the assembly process. More importantly, a good limiting effect is not achieved through interference fit during installation. This means reduced installation friction between the armature 11 and the push card 4, thereby reducing the generation of plastic debris and further improving product quality and durability.

[0079] Furthermore, such as Figure 11 , Figure 12As shown, the push card 4 has a receiving groove 43 at the upper end of the second side 112 of the second armature 11. The receiving groove 43 has a second limiting groove 42 and a third opening on two opposite sidewalls in the width direction of the second side 112 of the armature 11. The upper end of the second side 112 of the armature 11 is inserted into the receiving groove 43 through the third opening, with a clearance fit. The bottom of the receiving groove 43 has a fourth opening to avoid obstructing the portion below the upper end of the second side 112 of the armature 11. The design of the receiving groove 43 provides a larger mating area between the armature 11 and the push card 4, which helps improve the stability of their mating. The second side 112 of the armature 11 is arm-shaped, and its width is much smaller than the width of the first side 111 of the armature 11, allowing the push card 4 to be designed with a smaller width, thereby reducing space occupation and facilitating product miniaturization.

[0080] This invention discloses an electromagnetic relay in which the design of the anti-short-circuit structure of the moving spring part 2 is combined with the inverted design of the magnetic circuit part 1 (i.e., the second side 112 of the armature 11 extends along the direction of the connection point between the moving spring 21 and the moving spring lead-out piece 22; in this embodiment, it extends upwards). This allows the present invention to change the position of the push card 4 relative to the moving spring 21 by adjusting the length of the second side 112, thereby changing the size of the contact gap. Therefore, this invention provides a structural basis for achieving a large contact gap, enabling the relay to achieve a large contact gap according to actual needs, thus eliminating the need to connect multiple relays in series or adopt a larger, larger relay solution, thereby simplifying the structure, reducing costs, and meeting the application requirements of high safety standards.

[0081] The present invention will analyze the inverted and upright designs of the magnetic circuit part 1 and discuss the differences in their amplification of the contact gap.

[0082] like Figure 16 As shown, this is the inverted configuration of the magnetic circuit section 1. When the armature 11 rotates at an angle A, the horizontal movement distance D of the push card 4 is D = H1 * sin(A), and the movement distance d2 of the moving contact 23 is d2 = D * H3 / H2. Here, H1 is the vertical distance between the swing fulcrum of the armature 11 and the center of the push card 4, H2 is the vertical distance between the center of the push card 4 and the rotation fulcrum of the moving spring 21, and H3 is the vertical distance between the rotation fulcrum of the moving spring 21 and the center of the stationary contact 32. Because the rotation fulcrum of the moving spring 21 and the swing fulcrum of the armature 11 are fixed, H = H1 + H2. In this embodiment, taking the centerline of the push card 4 extending horizontally along its length as an example, if the centerline of the push card 4 is tilted at a certain angle, then H is slightly greater than the sum of H1 and H2.

[0083] Therefore, d2 = (H - H2) * sin(A) * H3 / H2, which simplifies to d2 = (H / H2 - 1) * H3 * sin(A).

[0084] From a secondary magnification perspective, the values ​​of H1 and H2 can be changed by adjusting the vertical position of the push card 4. Among them, H and H3 are fixed values, and with the angle A remaining unchanged, the variable range of the contact movement d2 is adjustable within (H / H2-1).

[0085] In actual product design, the material thickness and contact point issues need to be considered. H2 can be taken as 1 / 5 to 4 / 5 of H, that is, the coefficient range is 1 / 5 to 4 times, that is, the magnification factor of the contact gap ranges from 0.2 to 4.

[0086] To achieve a larger contact gap, angle A does not need to be adjusted; the initial δ value is fixed. This allows for a position with greater electromagnetic attraction, facilitating attraction and reaction force coordination, and maximizing the utilization of the coil's electromagnetic attraction. The δ value refers to the air gap between the first side 111 of the armature 11 and the lower end of the iron core 15.

[0087] like Figure 17 As shown, it is the upright configuration of magnetic circuit part 1 (i.e., the second side of armature 11 extends away from the connection point between moving spring 21 and moving spring lead-out piece 22, i.e.) Figure 17 (Extending downwards from the perspective of the viewpoint), when the armature 11 rotates at an angle of A, the horizontal distance that the push card 4 moves is also D = H1 * sin(A), and the distance that the moving contact 23 moves is d2 = D * H3 / H2. Where H1 is the vertical distance between the swing fulcrum of the armature 11 and the center of the push card 4, H2 is the vertical distance between the center of the push card 4 and the rotation fulcrum of the moving spring 21, and H3 is the vertical distance between the rotation fulcrum of the moving spring 21 and the center of the stationary contact.

[0088] After the fulcrum is fixed, H1 = H2 + ΔH, where ΔH is the perpendicular distance between the swing fulcrum of armature 11 and the rotation fulcrum of moving spring 21. Therefore, d2 = (H2 + ΔH) * sin(A) * H3 / H2, which simplifies to d2 = (1 + ΔH / H2) * H3 * sin(A).

[0089] From a secondary magnification perspective, the value of H1 can be changed by adjusting the up and down position of the push card 4. With angle A remaining constant, the variable range of the contact movement d2 is adjustable within (1 + ΔH / H2).

[0090] In actual product design, material thickness and contact point factors need to be considered, and ΔH is generally smaller than H2. Therefore, the actual magnification factor of the contact gap is 1-2 times.

[0091] To achieve a larger contact gap, angle A needs to be increased, which will result in a larger initial δ value. (This needs to be considered in conjunction with the attached...) Figure 18It can be seen that larger δ values ​​are in the region of lower electromagnetic attraction, making it difficult to meet the product's attraction and reaction force requirements.

[0092] Analysis of the inverted and upright designs of the magnetic circuit section 1 reveals that the inverted magnetic circuit design adopted in this invention has significant advantages in terms of contact gap amplification and electromagnetic attraction requirements. By optimizing the magnetic circuit layout, the inverted design achieves a greater contact gap amplification effect with a smaller electromagnetic attraction force, while reducing coil energy consumption and heat generation, thus facilitating the miniaturization and high performance of the relay.

[0093] Example 2

[0094] Please see Figures 19-25 As shown, the electromagnetic relay of this utility model differs from the first embodiment described above in that: the base 1 is provided with a reinforcing rib 58 between the auxiliary opening 54 and the clearance opening 57, which separates the auxiliary opening 54 from the clearance opening 57. By providing the reinforcing rib 58 between the auxiliary opening 54 and the clearance opening 57, this utility model effectively avoids the weakening of the base sidewall structure caused by direct penetration between the two, thereby significantly improving the overall strength and rigidity of the base sidewall.

[0095] A dotted adhesive groove 5141 is formed inside the fixing groove 514 to facilitate precise control of the amount of adhesive and guide the flow of adhesive during the assembly process, ensuring uniform and reliable bonding, while improving assembly efficiency.

[0096] In this embodiment, the through groove 531 of the insulating partition 53 is also a notch groove, which is used to allow the push card 4 to move. The aforementioned limiting rod 6 is not provided on the insulating partition 53.

[0097] The electromagnetic relay of this utility model is identical to or can be implemented using existing technology for the parts not described herein.

[0098] The above embodiments are only used to further illustrate an electromagnetic relay of the present invention, but the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. An electromagnetic relay, comprising a magnetic circuit portion, a contact portion, and a pusher, wherein the contact portion includes a cooperating moving spring portion and a stationary spring portion; characterized in that: The moving spring portion includes a moving spring plate, a moving spring lead plate, and a moving contact on the moving spring plate. The moving spring lead plate is located on the side opposite to the moving contact in the thickness direction of the moving spring plate, and the current directions of the two are opposite. The magnetic circuit portion includes a yoke and an armature. The armature is oscillatingly disposed at the blade edge of the yoke, and the armature includes a first side and a second side extending from its oscillation fulcrum and arranged at an angle. The first side has a snapping surface for attraction, and the second side extends along the direction of the connection point between the moving spring plate and the moving spring lead plate. The end of the second side is connected to the moving spring plate by a push clip. By adjusting the length of the second side, the connection position of the push clip relative to the moving spring plate can be changed, thereby adjusting the size of the contact gap of the contact portion. As the length of the second side increases, the contact gap increases.

2. The electromagnetic relay according to claim 1, characterized in that: The connection position of the push card relative to the movable spring is set within the range of [1 / 2, 4 / 5] of the vertical distance between the swing fulcrum of the armature and the connection point between the movable spring and the movable spring lead-out piece.

3. The electromagnetic relay according to claim 1, characterized in that: The movable spring is rigid, and one end of the movable spring is rotatably connected to one end of the movable spring lead-out piece, with a flexible conductive element connecting the two. The other end of the movable spring is provided with the movable contact. The side of the movable spring facing away from the movable contact is equipped with a contact spring, and the pusher connects to the contact spring so that the movable spring can be pushed towards the stationary spring section by pushing the contact spring, thereby generating overtravel.

4. The electromagnetic relay according to claim 3, characterized in that: It also includes an elastic element that cooperates with the movable spring, so that when the movable spring swings in the contact closing direction, the elastic element is compressed or stretched to store energy, and when the movable spring swings in the contact opening direction, the elastic element releases the stored energy. It also includes a base, on which the magnetic circuit portion, the moving spring lead-out piece, and the stationary spring portion are respectively mounted; the elastic element is mounted on the base.

5. The electromagnetic relay according to claim 4, characterized in that: The elastic element is a reaction spring, which is located on the side of the movable spring opposite to the movable spring lead-out plate, and is in abutting or clearance fit with the movable spring.

6. The electromagnetic relay according to claim 5, characterized in that: The reaction spring is bent and includes a mounting section above the bend line and an inclined section below the bend line. The mounting section is mounted on the base, and the inclined section is inclined toward the side closer to the moving spring. The end of the inclined section is rounded and abuts against the moving spring.

7. The electromagnetic relay according to any one of claims 1-5, characterized in that: The armature is connected to the armature by a limiting spring, so that the armature is held at the cutting edge.

8. The electromagnetic relay according to claim 4, characterized in that: It also includes a base, which has a contact cavity for accommodating the contact portion and a magnetic circuit cavity for accommodating the magnetic circuit portion. An insulating partition is provided between the contact cavity and the magnetic circuit cavity, which separates the contact cavity and the magnetic circuit cavity. The insulating partition is provided with a through groove corresponding to the push card, which connects the magnetic circuit cavity and the contact cavity, so as to allow the push card to be moved and / or guided. The elastic element is installed in the contact cavity.

9. The electromagnetic relay according to claim 8, characterized in that: The base sidewall is provided with a first opening for the contact portion to enter the contact cavity laterally and a second opening for the magnetic circuit portion to enter the magnetic circuit cavity laterally; the first opening and the second opening are located on different sides of the base.

10. The electromagnetic relay according to claim 9, characterized in that: The first opening and the second opening are oriented in opposite directions, and the orientations of the first opening and the second opening are perpendicular to the distribution directions of the contact cavity and the magnetic circuit cavity, respectively.

11. The electromagnetic relay according to claim 9, characterized in that: The inner wall of the magnetic circuit cavity is provided with at least one first limiting groove corresponding to the yoke. The portion of the yoke corresponding to the first limiting groove is inserted into the first limiting groove along the direction in which the magnetic circuit portion enters the magnetic circuit cavity. The outer side of the base is provided with at least one fixing groove leading to the magnetic circuit cavity. The yoke is provided with a first limiting protrusion corresponding to the fixing groove. The first limiting protrusion is inserted into the fixing groove and fixed with adhesive. An adhesive groove is formed inside the fixing groove.

12. The electromagnetic relay according to claim 9 or 10, characterized in that: The through groove is a notched groove, and the orientation of its opening is the same as that of the second opening; the side wall of the base opposite to the first opening is provided with an avoidance opening that connects the contact cavity and the through groove to the push card.

13. The electromagnetic relay according to claim 12, characterized in that: The base has an auxiliary opening on the side wall opposite to the first opening, corresponding to the contact point of the contact portion, which communicates with the contact cavity. This is used for heat dissipation and / or to avoid splashes generated when the contact portion breaks. The auxiliary openings are interconnected. Alternatively, the base has a reinforcing rib between the auxiliary opening and the avoidance opening, which separates the auxiliary opening from the avoidance opening.

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