Electromagnetic relay against inrush current

Abstract

The application discloses an electromagnetic relay capable of resisting inrush current, which comprises a base, a push card, a magnetic circuit part, a moving spring part and a static spring part. The moving spring part comprises a first moving spring sheet, a second moving spring sheet and a moving contact. The first moving spring sheet is arranged in a stack with the second moving spring sheet. The second moving spring sheet is arranged on the side of the first moving spring sheet which is opposite to the static spring part. The moving contact is fixed to the first moving spring sheet and the second moving spring sheet. The free end of the first moving spring sheet and the free end of the second moving spring sheet are respectively connected to the push card. The free end of the second moving spring sheet and the push card have a movement gap therebetween, so that the push card can move along the contact closing direction relative to the second moving spring sheet after the moving contact and the static contact are contacted. The size of the movement gap is smaller than the distance that the push card continues to move along the contact closing direction after the moving contact and the static contact are contacted. The application can not only improve the contact pressure, but also make the moving contact and the static contact obviously dislocate, thereby improving the problem that the contact is easily bonded under the large inrush current.

Description

Technical Field

[0001] This invention relates to a relay, and more particularly to an electromagnetic relay resistant to surge current. Background Technology

[0002] An electromagnetic relay is an electronic control device commonly used in automatic control circuits. It essentially functions as an "automatic switch" that uses a smaller current to control a larger current, thus playing roles in automatic adjustment, safety protection, and circuit switching. A current electromagnetic relay includes a base, a magnetic circuit section, a moving spring section, a stationary spring section, and a pusher clip. The magnetic circuit section engages with the moving spring section via the pusher clip.

[0003] With the continuous development of 5G and green energy-saving buildings, the demand for high-power electromagnetic relays with strong lighting capacity and low power consumption is rapidly expanding in industrial and construction sectors such as office buildings and public facilities. Products in this field have higher requirements for surge current and high load current characteristics. To achieve surge current resistance in relays, existing technologies typically use two or more (including two) stacked and riveted moving springs. A pusher only moves one of these moving springs. Specifically, the pusher moves the spring section. Before the moving and stationary contacts make contact, the gap between them gradually decreases, resulting in a small reaction force from the moving spring. After the moving and stationary contacts make contact, as the pusher continues to move, the moving spring connected to the pusher undergoes significant deformation because the fulcrum becomes the contact point between the moving and stationary contacts. During this stage, the reaction force of the moving spring is larger, meaning the slope of the reaction force relative to the pusher's displacement is greater than in the previous stage. The pusher continues to move in this state until the end of the entire stroke. Therefore, the entire stroke has two slope segments (e.g., ...). Figure 20 (As shown in slope segments b and c). However, the above-mentioned relay has the following shortcomings: the reaction force of a moving spring and the contact pressure are relatively small. For load characteristics such as large surge current, the contacts are prone to sticking failure, resulting in poor relay reliability. Summary of the Invention

[0004] This invention addresses the technical problems existing in the prior art by providing an electromagnetic relay that resists surge current. It improves the connection structure between the moving spring and the push card, thereby increasing the reaction force of the moving spring and solving the problem of contact adhesion.

[0005] The technical solution adopted by this invention to solve its technical problem is: an electromagnetic relay resistant to surge current, comprising a base, a push card, and a magnetic circuit portion, a moving spring portion, and a stationary spring portion located on the base. The moving spring portion includes at least one first moving spring, at least one second moving spring, and a moving contact. The first and second moving springs are stacked, with the second moving spring located on the side of the first moving spring facing away from the stationary spring portion. The moving contact is fixed to the first and second moving springs. The magnetic circuit portion cooperates with the moving spring portion through the push card. The free ends of the first and second moving springs are respectively connected to the push card. There is a movement gap between the free end of the second moving spring and the push card, allowing the push card to move relative to the second moving spring along the contact closing direction after the moving contact contacts the stationary contact of the stationary spring portion. The size of the movement gap is less than the distance the push card continues to move along the contact closing direction after the moving contact contacts the stationary contact.

[0006] Furthermore, one end of the push card is provided with a first slot and a second slot arranged sequentially from one end of the push card to the other end. The free end of the first movable spring passes through the first slot, and the free end of the second movable spring passes through the second slot, with the movement gap between them. The free end of the first movable spring and the first slot are in a zero-gap fit or a gap fit, and the gap size of the gap fit is smaller than the size of the movement gap.

[0007] Furthermore, the free end of the second movable spring is provided with a first hook, which passes through the push card and faces the first movable spring; the free end of the second movable spring is also provided with a second hook, which is close to the push card but does not pass through the push card, and the orientation of the second hook is opposite to that of the first hook.

[0008] Furthermore, the tail end of the first hook contacts or is adjacent to the free end of the first movable spring, forming a ring between them, and a portion of the push card passes through this ring; there are multiple second hooks, and the first hook is located between the multiple second hooks.

[0009] Furthermore, the first movable spring is provided with a long, curved perforation, which surrounds the movable contact. The two ends of the perforation are located on the side of the movable contact furthest from the free end of the first movable spring.

[0010] Furthermore, the perforated hole is U-shaped, C-shaped, or U-shaped.

[0011] Furthermore, the magnetic circuit portion includes a coil assembly and an armature component that cooperates with it. The armature component includes two armatures, a permanent magnet, and a plastic part. The permanent magnet is fixed and tightly attached between the opposing surfaces of the two armatures by the plastic part. The plastic part is provided with a pushing part, which is movably connected to the pushing card. The armature component is rotatably configured.

[0012] Furthermore, the plastic part has a rotating shaft on each of its opposite sides, and the two rotating shafts are located on the same axis; the base has two opposing baffles, each baffle having a shaft hole, the two shaft holes facing each other, and the two rotating shafts being able to rotate within the two shaft holes respectively; at least one shaft hole has an opening on one side, and the distance between the two ends of the opening is greater than or equal to the diameter of the rotating shaft; the corresponding rotating shaft of the armature component enters the shaft hole through the opening, and the opening is stopped by a limiting structure fixed relative to the base to prevent the rotating shaft from coming out of the opening.

[0013] Furthermore, one of the shaft holes is provided with the opening, and one of the rotating shafts of the armature component enters the one of the shaft holes through the opening, while the other rotating shaft of the armature component passes through the other shaft hole from the inside of the retaining wall where the other shaft hole is located; or, the two shaft holes are respectively provided with the opening on the same side, and the two rotating shafts of the armature component enter the two shaft holes through the corresponding openings respectively, and the number of the limiting structures is two, corresponding one-to-one with the openings of the two shaft holes.

[0014] Furthermore, the retaining wall where one of the shaft holes is located is provided with a first sliding groove leading to the opening and adapted to the sliding of one of the rotating shafts, the first sliding groove passing through the inner and outer sides of the retaining wall where it is located; the inner side of the retaining wall where the other shaft hole is located is provided with a second sliding groove leading to the other shaft hole and adapted to the sliding of the other rotating shaft; the first sliding groove and the second sliding groove are distributed opposite to each other.

[0015] Furthermore, the retaining wall where one of the shaft holes is located is provided with an opening leading to one of the shaft holes and a first groove suitable for sliding one of the rotating shafts, and the retaining wall where the other shaft hole is located is provided with an opening leading to the other shaft hole and a second groove suitable for sliding the other rotating shaft. The first groove and the second groove pass through the inner and outer sides of the retaining wall where they are located, respectively, and the first groove and the second groove are distributed opposite to each other.

[0016] Furthermore, it also includes a housing, the bottom of which is connected to the base and encloses the magnetic circuit portion, the moving spring portion, the stationary spring portion, and the push card within its cavity; the limiting structure is provided on the inner side of the housing; the portion of the limiting structure located at the opening has an arc surface facing the rotating shaft, which fits the outer periphery of the rotating shaft; the limiting structure is a limiting rib extending along the height direction of the housing, and the outer side of the retaining wall corresponding to the limiting rib has a relief groove suitable for accommodating the limiting rib and leading to the opening, and the bottom of the limiting rib stops at the opening of the corresponding shaft hole.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. Since the free ends of the first and second moving springs are respectively connected to the push card, and there is a movement gap between the free end of the second moving spring and the push card, the push card can move relative to the second moving spring along the contact closing direction after the moving contact contacts the stationary contact of the stationary spring. The movement gap is less than the distance the push card continues to move along the contact closing direction after the moving contact contacts the stationary contact. Therefore, the present invention makes the second moving spring also receive a thrust at the end of the push card's movement, which not only increases the reaction force of the entire moving spring and increases the contact pressure, but also makes the moving contact and the stationary contact move significantly, thereby significantly improving the problem of contact sticking easily caused by large surge currents and significantly improving the reliability of the relay.

[0019] 2. The design of the first and second slots simplifies the connection between the push card and the first and second movable springs, allowing the invention to achieve the aforementioned technical effects with a simple structure. 3. The first and second hooks limit the push card's movement in its thickness direction, making its movement more stable. The tail end of the first hook contacts or is adjacent to the free end of the first movable spring, forming a ring between them. The push card partially passes through this ring, thus achieving complete connection between the push card and the movable spring portion and preventing the push card from detaching from the movable spring portion.

[0020] 4. The first moving spring is provided with a long, curved hollow hole. The hollow hole surrounds the moving contact, so that the reaction force of the entire moving spring part of the present invention is not too large, so that it can better match the electromagnetic attraction force of the magnetic circuit part, and make the magnetic circuit part reliably engage.

[0021] 5. Since the plastic part is provided with the two rotating shafts and the base is provided with the two shaft holes, and at least one side of the shaft hole is provided with an opening, the armature component of the present invention does not need to be connected to the base by a metal rotating shaft, thereby saving parts and reducing costs. At the same time, the structure and assembly are simple, making it easy to achieve automated production. Moreover, no plastic shavings are generated during the assembly process, and the stability of the relay parameters is not affected.

[0022] 6. The first and second slide grooves provide installation guidance for the armature components, making the installation of the armature components more convenient and allowing the distance between the two retaining walls of the base to be smaller, while ensuring stable assembly of the armature components.

[0023] 7. The limiting structure is located on the outer shell, so that the limiting structure is exempt from additional assembly, thereby further simplifying the assembly process.

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the surge current resistant electromagnetic relay of the present invention is not limited to the embodiments. Attached Figure Description

[0025] Figure 1 This is an exploded view of the present invention as described in Embodiment 1;

[0026] Figure 2 This is a three-dimensional structural schematic diagram of the first movable spring of the present invention in Embodiment 1;

[0027] Figure 3 This is a three-dimensional structural schematic diagram of the second movable spring of the present invention in Embodiment 1;

[0028] Figure 4 This is a three-dimensional structural schematic diagram of the movable spring portion of the present invention in Embodiment 1;

[0029] Figure 5 This is a side view of the movable spring portion of the present invention in Embodiment 1;

[0030] Figure 6 This is a three-dimensional structural diagram of the push card of the present invention in Embodiment 1;

[0031] Figure 7 This is a top view of the push card of the present invention in Embodiment 1;

[0032] Figure 8 This is a three-dimensional structural diagram of the moving spring and the pusher in the combined state of the present invention in Embodiment 1;

[0033] Figure 9 This is a side view of the moving spring portion and the pusher clip of the present invention in the combined state according to Embodiment 1;

[0034] Figure 10 This is a three-dimensional structural diagram of the base of the present invention, as shown in Embodiment 1. Figure 1 ;

[0035] Figure 11 This is a three-dimensional structural diagram of the base of the present invention, as shown in Embodiment 1. Figure 2 ;

[0036] Figure 12 This is a three-dimensional structural schematic diagram of the armature component of the present invention in Embodiment 1;

[0037] Figure 13 This is a three-dimensional structural schematic diagram of the outer shell of the present invention in Embodiment 1;

[0038] Figure 14 This is a three-dimensional structural diagram of the base and armature components of the present invention in an assembled state, as shown in Embodiment 1. Figure 1 ;

[0039] Figure 15 This is a three-dimensional structural diagram of the base and armature components of the present invention in an assembled state, as shown in Embodiment 1. Figure 2 ;

[0040] Figure 16 This is a front view of the present invention (excluding the outer casing) according to Embodiment 1;

[0041] Figure 17 This is a cross-sectional view of the present invention in Embodiment 1. Figure 1 ;

[0042] Figure 18 This is a cross-sectional view of the present invention in Embodiment 1. Figure 2 ;

[0043] Figure 19 This is Example 1 Figure 18 An enlarged schematic diagram of part A in the middle;

[0044] Figure 20 This is a schematic diagram showing the relationship between the electromagnetic attraction force, the reaction force of the moving spring, and the displacement of the push card in Embodiment 1.

[0045] Figure 21 This is a three-dimensional structural diagram of the base of the present invention in Embodiment 2;

[0046] Among them, 1. Base, 11 / 12. Retaining wall, 111. One of the shaft holes, 1111 / 1211. Opening, 112. First sliding groove, 121. The other shaft hole, 122. Second sliding groove, 113. Relief groove, 13. Partition wall, 2. Moving spring part, 21. First moving spring, 211. Straight plate, 212. Hollow hole, 22. Second moving spring, 221. First hook, 212. Second hook, 223. Arched bend, 23. Moving contact, 2 4. Moving spring lead-out piece; 3. Stationary spring part; 31. Stationary contact; 4. Push card; 41. First slot; 42. Second slot; 43. Receiving slot; 5. Armature part; 51. Armature; 52. Plastic part; 521. One of the rotating shafts; 522. The other rotating shaft; 523. Push part; 5231. Rod body; 6. Coil assembly; 61. Coil frame; 62. Coil; 63. Iron core; 64. Yoke; 7. Outer shell; 71. Limiting rib; 711. Curved surface. Detailed Implementation

[0047] In this invention, the terms "first," "second," etc., are used only to distinguish similar objects and are not necessarily used 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" and "left" in the description 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 the invention, and does not 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 invention. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0048] In addition, in the description of this application, unless otherwise stated, "at least one" means one or more, and "multiple" means two or more.

[0049] Example 1

[0050] Please see Figures 1-20 As shown, an electromagnetic relay for surge current protection according to the present invention includes a base 1, a push card 4, and a magnetic circuit portion, a moving spring portion 2, and a stationary spring portion 3 located on the base 1. The moving spring portion 2 includes at least one first moving spring 21, at least one second moving spring 22, and a moving contact 23. The first moving spring 21 and the second moving spring 22 are stacked and arranged, and the second moving spring 22 is located on the side of the first moving spring 21 that is away from the stationary spring portion 3. The moving contact 23 is fixed to the first moving spring 21 and the second moving spring 22. The magnetic circuit part cooperates with the moving spring part 2 via the push card 4; the free end of the first moving spring 21 is separate from the free end of the second moving spring 22, and the free ends of the first moving spring 21 and the second moving spring 22 are respectively connected to the push card 4. There is a movement gap between the free end of the second moving spring 22 and the push card 4, so that after the moving contact 23 contacts the stationary contact 31 of the stationary spring part 3, the push card 4 can move relative to the second moving spring 22 in the contact closing direction. The size of the movement gap is less than the distance that the push card 4 continues to move in the contact closing direction after the moving contact 23 contacts the stationary contact 31. The number of the first moving spring 21 and the second moving spring 22 is one, but not limited to this. The roots of the first moving spring 21 and the second moving spring 22 are electrically connected to the moving spring lead-out piece 24, and the electrical connection method is riveting, but not limited to this. The moving contact 23 is also fixed to the first moving spring 21 and the second moving spring 22 by riveting.

[0051] In this embodiment, as Figures 6-9As shown, one end of the push card 4 is provided with a first slot 41 and a second slot 42 arranged sequentially from one end of the push card 4 to the other end. The free end of the first movable spring 21 passes through the first slot 41, and the width of the first slot 41 is adapted to the width of the free end of the first movable spring 21, so that when the push card 4 moves in the contact closing direction, it can synchronously drive the free end of the first movable spring 21 to move. Therefore, the first slot 4 and the free end of the first movable spring 21 are basically in a gapless fit, but not limited to this. In other embodiments, the first slot 4 and the free end of the first movable spring are in a gap fit. In this case, the gap size of the gap fit is smaller than the size of the movement gap. The free end of the second movable spring 22 passes through the second slot 42, and there is the movement gap between them. That is, the width of the second slot 42 is greater than the width of the free end of the second movable spring 22. In the contact-off state, the distance between the free end of the second movable spring 22 and the first inner side of the second slot 42 is less than the distance between the free end of the second movable spring 22 and the second inner side of the second slot 42. The first inner side is the inner side of the second slot 42 that is closest to the first slot 41, and the second inner side is the inner side of the second slot 42 that is furthest from the first slot 41.

[0052] In this embodiment, as Figure 2 As shown, the first movable spring 21 is a flat piece, with a straight plate 211 in the middle of its free end. Stepped structures are provided on both sides of its free end, and the straight plate 211 is inserted into the first slot 41. Figure 3As shown, the free end of the second movable spring 22 is provided with a first hook 221 and a second hook 222. The first hook 221 and the second hook 222 are respectively adapted to both sides of the push card 4 in the thickness direction to limit the relative displacement of the push card 4 in the thickness direction. The first hook 221 passes through the second slot 42 of the push card 4 and faces the first movable spring 21. The second hook 222 is close to the push card 4 but does not pass through the push card 4, and the orientation of the second hook 222 is opposite to that of the first hook 221. There are multiple second hooks 222, and the first hook 221 is located among the multiple second hooks 222. Specifically, there are two second hooks 222, but it is not limited to this. The tail end of the first hook 221 contacts or is adjacent to the free end of the first movable spring 21, so that the two form a ring. The push card 4 is partially inserted through this ring, thereby realizing the complete connection between the push card 4 and the movable spring part 2 and preventing the push card 4 from detaching from the movable spring part 2. Specifically, one end of the push card 4 passes through the annular body at the portion between its first slot 41 and second slot 42 (which serves as a separating rod capable of separating the first slot 41 and the second slot 42). The second hook 222 is specifically located below the push card 4, so that the second hook 222 also provides a certain degree of support for the push card 4.

[0053] In this embodiment, the free end of the second movable spring 22 protrudes from both sides, and the free end of the second movable spring 22 is separated from the free end of the first movable spring 21 by two bends, forming the first hook 221. The two sides of the free end of the second movable spring 22 are each formed by one bend to create the second hook 222. The tail end of the first hook 221 is close to the straight body 211 of the first movable spring 21, so that the free end of the first movable spring 21 and the straight body 211 of the second movable spring 22 roughly form an annular structure that hangs on one end of the push card 4. The second movable spring 22 has an arched bend 223 near its root, which protrudes away from the first movable spring 21, so that the first movable spring 21 and the second movable spring 22 have a gap at this position to prevent the movable spring part 2 from jamming when it deforms.

[0054] In this embodiment, as Figure 2 As shown, the first movable spring 21 has a long, curved perforated hole 212 surrounding the movable contact 23. The two ends of the perforated hole 212 are located on the side of the movable contact 23 furthest from the free end of the first movable spring 21. Specifically, the perforated hole 212 is generally U-shaped (or, more accurately, inverted U-shaped), but not limited to this. In other embodiments, the perforated hole 212 is C-shaped or U-shaped, etc.

[0055] In this embodiment, the magnetic circuit portion includes a coil assembly 6 and a cooperating armature component 5. The armature component 5 includes two armatures 51, a permanent magnet (not shown in the figure), and a plastic part 52. The permanent magnet is fixed and tightly attached between the opposing surfaces of the two armatures 51 by the plastic part 52. The plastic part 52 is provided with a pushing part 523, which is movably connected to the pushing clip 4. The armature component 5 is rotatably configured; specifically, the armature component 5 is rotatably connected to the base 1. Therefore, the present invention constitutes a magnetic latching relay, but the present invention is not limited to the magnetic latching type. The coil assembly 6 specifically includes a coil frame 61, a coil 62 wound around the coil frame 61, an iron core 63 passing through the coil frame 61, and two yokes 64. The two yokes 64 are L-shaped, and one side of each yoke 64 is fixedly connected to both ends of the iron core 63 (the connection method is riveting, but not limited to this). The other sides of the two yokes 64 are located on the same outer side of the coil frame 61 and are arranged opposite each other. The other sides of the two yokes 64 are respectively inserted into the two openings formed by the armature component 5. Figure 17 As shown. The coil assembly 6 is vertical, the pusher 4 is located above the armature component 5, the pusher part 523 of the plastic part 52 extends upward, and the tail end of the pusher part 523 is provided with a rod 5231 with an arc-shaped cross-section, as shown. Figure 12 As shown, the rotation axis of the rod body 5231 is parallel to that of the armature component 5. The pusher 4 is provided with a receiving groove 43 adapted to the rod body 5231, and the rod body 5231 is movably inserted into the receiving groove 43.

[0056] In this embodiment, as Figure 12 As shown, the plastic part 52 has a rotating shaft on each of its opposite sides, and the two rotating shafts 521 and 522 are located on the same axis. The base 1 has two opposing baffles 11 and 12, each with a shaft hole. The two shaft holes 111 and 121 are opposite to each other, and the two rotating shafts 521 and 522 can rotate within the shaft holes 111 and 121 respectively. At least one shaft hole has an opening on one side, and the distance between the two ends of the opening is greater than or equal to the diameter of the rotating shaft. The corresponding rotating shaft of the armature component 5 enters the shaft hole through the opening, and the opening is stopped by a limiting structure fixed relative to the base 1 to prevent the rotating shaft from coming out of the opening.

[0057] In this embodiment, one side of one of the shaft holes 111 is provided with the opening 1111, thus, one of the shaft holes 111 is approximately a half hole. One of the rotating shafts 521 of the armature component 5 enters the one of the shaft holes 111 through the opening 1111, and the other rotating shaft 522 of the armature component passes through the other shaft hole 121 from the inside of the retaining wall 12 where the other shaft hole 121 is located.

[0058] In this embodiment, the retaining wall 11 where one of the shaft holes 111 is located is provided with a first groove 112 that leads to the opening 1111 and is suitable for the sliding of one of the rotating shafts 111. The first groove 112 penetrates the inner and outer sides of the retaining wall 11 where it is located. The inner side of the retaining wall 12 where the other shaft hole 121 is located is provided with a second groove 122 that leads to the other shaft hole 121 and is suitable for the sliding of the other rotating shaft 522. The first groove 112 and the second groove 122 are distributed opposite to each other. The second groove 122 is provided so that the other shaft hole 121 is approximately a half-hole when viewed from the inside of the retaining wall 12. Figure 10 As shown, from the outside of retaining wall 12, it appears as a full hole, as... Figure 11 As shown. The first slide groove 112 and the second slide groove 122 provide installation guidance for the armature component 5, making the installation of the armature component 5 more convenient and allowing the distance between the first retaining wall 11 and the second retaining wall 12 to be set smaller, while ensuring stable assembly of the armature component 5. The first slide groove 112 and the second slide groove 122 are respectively inclined in the same direction. In this way, on the one hand, the two yokes 64 can be avoided, and on the other hand, the armature component 5 can be pre-positioned during installation, making it difficult for one of the rotating shafts 521 of the armature component 5 to slip out of one of the shaft holes 111.

[0059] In this embodiment, the invention further includes a housing 7, the bottom end of which is connected to the base 1, and the magnetic circuit portion, the moving spring portion 2, the stationary spring portion 3, and the pusher 4 are contained within its cavity. The limiting structure is located on the inner side of the housing 7. Specifically, the limiting structure is a limiting rib 71 extending along the height direction of the housing. The outer side of the retaining wall 11 corresponding to the limiting rib 71 is provided with a relief groove 113 suitable for accommodating the limiting rib 71 and leading to the opening. The bottom of the limiting rib 71 stops at the opening 1111 of one of the shaft holes 111. The portion of the limiting structure (i.e., the limiting rib 71) located at the opening 1111 has an arc surface 711 facing the rotating shaft 521. This arc surface 711 fits the outer periphery of the rotating shaft 521, thus preventing the portion of the limiting structure located at the opening 1111 from causing jamming of the rotating shaft 521. In other embodiments, the limiting structure is a limiting member mounted on the base, which has two states: blocking the opening and releasing the opening, and is fixed relative to the base in the blocking state.

[0060] In this embodiment, the base 1 is also provided with a partition wall 13 located between the two baffle walls 11 and 12, and the partition wall 13 separates the armature component 5 from the moving spring part 2 and the stationary spring part 3.

[0061] An electromagnetic relay for surge current protection according to the present invention comprises an armature component 5 and a base 1 assembled as follows: one of the rotating shafts 521 of the armature component 5 is slid along a first sliding groove 112 toward one of the shaft holes 111, and the other rotating shaft 522 is slid along a second sliding groove 122 toward the other shaft hole 121. When one of the rotating shafts 521 slides into one of the shaft holes 111 and the other rotating shaft 522 enters the half-hole portion of the other shaft hole 121, the entire armature component 5 is pushed in the extending direction of the other rotating shaft 522, so that the other rotating shaft 522 passes through the full-hole portion of the other shaft hole 121. Figure 14 , Figure 15 As shown. When the outer casing 7 is connected to the base 1, the limiting rib 71 on the inner side of the outer casing 7 is inserted from top to bottom into the accommodating groove 113 on the outer side of the retaining wall 11, and the arc surface 711 at the bottom of the limiting rib 71 stops at the opening 1111 of one of the shaft holes 111, as shown. Figure 18 , Figure 19 As shown, this restricts one of the rotating shafts 521 from sliding out of the opening 1111 of the shaft hole 111. Therefore, the armature component 5 of the present invention does not need to be rotatably connected to the base 1 by a metal rotating shaft, thereby saving parts and reducing costs. At the same time, the structure and assembly are simple, making it easy to automate production. Furthermore, no plastic shavings are generated during the assembly process, and the stability of the relay parameters is not affected.

[0062] The surge current resistant electromagnetic relay of the present invention drives the movement of card 4 as follows:

[0063] Pushing the card 4 to the left (i.e., in the direction of contact closure), the inner side of its first slot 41 first contacts the first moving spring 21, pushing the moving spring part 2 to the left, causing the gap between the moving contact 23 and the stationary contact 31 to gradually decrease. During this process, the reaction force of the moving spring part 2 is relatively small, corresponding to... Figure 20 In the slope segment b; after the moving contact 23 and the stationary contact 31 begin to contact, as the push card 4 continues to move to the left, the first moving spring 21 continues to move to the left, while the second moving spring 22 no longer moves relative to the moving contact 23 since the moving contact 23 and the stationary contact 31 have completely contacted. Therefore, during this process, the push card 4 moves to the left relative to the second moving spring 22, causing the distance between the second inner side of the second slot 42 and the second moving spring 22 to gradually decrease until they contact. In this stage, the deformation fulcrum of the moving spring part 2 changes from the free end of the first moving spring 21 to the contact point between the moving contact 23 and the stationary contact 31. Therefore, the reaction force of the moving spring part 2 is relatively large, corresponding to... Figure 20 The slope segment c; when the pusher 4 continues to move to the left, the two slots of the pusher block simultaneously push the two moving springs (i.e., the inner side of the first slot 41 pushes the first moving spring 21, and the second inner side of the second slot 42 pushes the second moving spring 22). Compared to the previous stage, since the second moving spring 22 also undergoes deformation due to the force, the reaction force in this stage increases again, corresponding to... Figure 20 The slope segment d in the middle.

[0064] Therefore, compared with the prior art, the reaction force of the moving spring part 2 of this invention has three slope segments throughout the entire stroke of pushing the card 4, which can improve the reaction force of the entire moving spring part 2, thereby increasing the contact pressure. At the same time, since the second moving spring 22 is also subjected to thrust at the end of the movement of pushing the card 4, the deformation of the second moving spring 22 will cause the moving contact 23 to twist, causing the moving contact 23 to move significantly with the stationary contact 31, thereby significantly improving the problem of contact sticking easily caused by large surge currents, and significantly improving the reliability of the relay. After the hollow hole 212 is provided on the first moving spring 21, the reaction force of the entire moving spring part 2 is not too large, so that it can be resisted by the electromagnetic attraction of the magnetic circuit (such as... Figure 20 As shown in the figure, curve a is the electromagnetic attraction curve, which is more compatible and makes the magnetic circuit part reliably attracted.

[0065] Example 2

[0066] Please see Figure 21 As shown, the surge current resistant electromagnetic relay of the present invention differs from the above embodiment one in that: the two shaft holes 111 and 121 are respectively provided with openings 1111 / 1211 on the same side; the two rotating shafts 521 and 522 of the armature component 5 enter the two shaft holes 111 and 121 through the corresponding openings; and the number of the limiting structures is two, corresponding one-to-one with the openings 1111 / 1211 of the two shaft holes 111 and 121.

[0067] In this embodiment, the retaining wall 11 where one of the shaft holes 111 is located is provided with an opening 1111 leading to one of the shaft holes and a first groove 112 suitable for sliding one of the rotating shafts 521. The retaining wall 12 where the other shaft hole 121 is located is provided with an opening 1211 leading to the other shaft hole and a second groove 122 suitable for sliding the other rotating shaft 522. The first groove 112 and the second groove 122 respectively penetrate the inner and outer sides of the retaining wall where they are located, and the first groove 112 and the second groove 122 are distributed opposite to each other and inclined in the same direction.

[0068] In this embodiment, the limiting structure is also a limiting rib 71 provided on the inner side of the outer shell 7, and there are two limiting ribs 71, which are arranged opposite to each other. The outer sides of the two retaining walls 11 and 12 of the base are respectively provided with relief grooves that can accommodate the limiting ribs 71.

[0069] The present invention discloses an electromagnetic relay for surge current protection, wherein the armature component 5 is assembled with the base 1 as follows: one of the rotating shafts 521 of the armature component 5 is slid along the first sliding groove 112 toward one of the shaft holes 111, and the other rotating shaft 522 is slid along the second sliding groove 122 toward the other shaft hole 121. When one rotating shaft 521 slides into one of the shaft holes 111 and the other rotating shaft 522 slides into the other shaft hole 121, the initial assembly of the armature component 5 is completed. When the housing 7 is connected to the base 1, the two limiting ribs 71 on the inner side of the housing 7 are inserted from top to bottom into the relief grooves on the outer side of the retaining walls 11 and 12, respectively, and the arc surface 711 at the bottom of each limiting rib 71 stops at the opening of the corresponding shaft hole, thereby restricting the two rotating shafts 521 and 522 of the armature component 5 from sliding out of the openings 1111 and 1211 of the two shaft holes.

[0070] The present invention provides an electromagnetic relay for resisting surge current. The parts not described herein are the same as or can be implemented using existing technologies.

[0071] The above embodiments are only used to further illustrate an electromagnetic relay for resisting surge current according to the present invention. However, 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 resistant to surge current, comprising a base, a push-lock, and a magnetic circuit portion, a moving spring portion, and a stationary spring portion located on the base, wherein the moving spring portion includes at least one first moving spring plate, at least one second moving spring plate, and a moving contact, the first and second moving spring plates being stacked, the second moving spring plate being located on the side of the first moving spring plate opposite to the stationary spring portion, and the moving contact being fixed to the first and second moving spring plates; the magnetic circuit portion cooperates with the moving spring portion via the push-lock; characterized in that: The free ends of the first moving spring and the second moving spring are respectively connected to the push card. There is a movement gap between the free end of the second moving spring and the push card before the moving contact and the stationary contact come into contact. This allows the push card to continue moving relative to the second moving spring in the contact closing direction after the moving contact and the stationary contact of the stationary spring part begin to make contact. The size of the movement gap is less than the distance the push card continues to move in the contact closing direction after the moving contact and the stationary contact begin to make contact.

2. The surge current resistant electromagnetic relay according to claim 1, characterized in that: One end of the push card is provided with a first slot and a second slot arranged sequentially from one end of the push card to the other end. The free end of the first movable spring passes through the first slot, and the free end of the second movable spring passes through the second slot, with the movement gap between them. The free end of the first movable spring and the first slot are in a zero-gap fit or a gap fit, and the size of the gap fit is smaller than the size of the movement gap.

3. The surge current resistant electromagnetic relay according to claim 1, characterized in that: The free end of the second movable spring is provided with a first hook, which passes through the push card and faces the first movable spring; the free end of the second movable spring is also provided with a second hook, which is close to the push card but does not pass through the push card, and the orientation of the second hook is opposite to that of the first hook.

4. The surge current resistant electromagnetic relay according to claim 3, characterized in that: The tail end of the first hook contacts or is adjacent to the free end of the first movable spring, forming a ring between them, and a portion of the push card passes through this ring; there are multiple second hooks, and the first hook is located between the multiple second hooks.

5. The surge current resistant electromagnetic relay according to claim 1, characterized in that: The first movable spring has a long, curved perforation that surrounds the movable contact. The two ends of the perforation are located on the side of the movable contact furthest from the free end of the first movable spring.

6. The surge current resistant electromagnetic relay according to claim 5, characterized in that: The perforated holes are U-shaped, C-shaped, or U-shaped.

7. The surge current resistant electromagnetic relay according to any one of claims 1-6, characterized in that: The magnetic circuit section includes a coil assembly and an armature component that cooperates with it. The armature component includes two armatures, a permanent magnet, and a plastic part. The permanent magnet is fixed and tightly attached between the opposing surfaces of the two armatures by the plastic part. The plastic part is provided with a pushing part, which is movably connected to the pushing card. The armature component is rotatably arranged.

8. The surge current resistant electromagnetic relay according to claim 7, characterized in that: The plastic component has a rotating shaft on each of its opposite sides, and the two rotating shafts are located on the same axis. The base has two opposing baffles, each baffle having a shaft hole. The two shaft holes are opposite to each other, and the two rotating shafts can rotate within the two shaft holes respectively. At least one shaft hole has an opening on one side, and the distance between the two ends of the opening is greater than or equal to the diameter of the rotating shaft. The corresponding rotating shaft of the armature component enters the shaft hole through the opening, and the opening is stopped by a limiting structure fixed relative to the base to prevent the rotating shaft from coming out of the opening.

9. The surge current resistant electromagnetic relay according to claim 8, characterized in that: One of the shaft holes has the opening, and one of the rotating shafts of the armature component enters the one of the shaft holes through the opening. The other rotating shaft of the armature component passes through the other shaft hole from the inside of the retaining wall where the other shaft hole is located. Alternatively, the two shaft holes have the opening on the same side, and the two rotating shafts of the armature component enter the two shaft holes through the corresponding openings. The number of the limiting structures is two, corresponding one-to-one with the openings of the two shaft holes.

10. The surge current resistant electromagnetic relay according to claim 9, characterized in that: The retaining wall where one of the shaft holes is located is provided with a first sliding groove leading to the opening and suitable for sliding of one of the rotating shafts. The first sliding groove passes through the inner and outer sides of the retaining wall where it is located. The inner side of the retaining wall where the other shaft hole is located is provided with a second sliding groove leading to the other shaft hole and suitable for sliding of the other rotating shaft. The first sliding groove and the second sliding groove are distributed opposite to each other.

11. The surge current resistant electromagnetic relay according to claim 9, characterized in that: The retaining wall where one of the shaft holes is located has a first groove that leads to one of the shaft holes and is suitable for sliding one of the shafts. The retaining wall where the other shaft hole is located has a second groove that leads to the other shaft hole and is suitable for sliding the other shaft. The first groove and the second groove pass through the inner and outer sides of the retaining wall where they are located, respectively, and the first groove and the second groove are distributed opposite to each other.

12. The surge current resistant electromagnetic relay according to any one of claims 8-11, characterized in that: It also includes a housing, the bottom of which is connected to the base and encloses the magnetic circuit part, the moving spring part, the stationary spring part, and the push card in its cavity; the limiting structure is provided on the inner side of the housing; the portion of the limiting structure at the opening has an arc surface facing the rotating shaft, which fits the outer periphery of the rotating shaft; the limiting structure is a limiting rib extending along the height direction of the housing, and the outer side of the retaining wall corresponding to the limiting rib has a relief groove suitable for accommodating the limiting rib and leading to the opening, and the bottom of the limiting rib stops at the opening of the corresponding shaft hole.

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