Electromagnetic relay with contact adhesion prevention

Abstract

The application discloses an electromagnetic relay capable of preventing contact adhesion, comprising a base, a magnetic circuit part and a contact part, the magnetic circuit part is arranged on the base, the contact part comprises a push card and at least one contact unit, the contact unit comprises at least one rigid moving spring piece, at least one static spring part arranged on the base, the static spring part comprises a flexible static spring piece and a limiting piece, the rigid moving spring piece is fixed on the push card, the push card is driven by an armature of the magnetic circuit part, the limiting piece is fixed on the base and / or the flexible static spring piece, and the limiting piece limits the deformation degree of the flexible static spring piece in the direction of the corresponding moving contact, so that the flexible static spring piece meets the contact overstroke through the flexible feature, and the adhesion of the static contact and the moving contact is prevented. The application solves the problem that the moving spring piece is prone to fatigue fracture due to frequent high stress deformation, and the structural reliability is poor, and simultaneously plays the role of preventing the contact adhesion.

Description

Technical Field

[0001] This invention relates to a relay, and more particularly to an electromagnetic relay that prevents contact sticking. Background Technology

[0002] An electromagnetic relay is an electronic control device that is commonly used in automatic control circuits. It is essentially an "automatic switch" that uses a smaller current to control a larger current, thus playing roles such as automatic adjustment, safety protection, and circuit switching in circuits.

[0003] Existing electromagnetic relays typically include a base, a magnetic circuit, and a contact section. The contact section often uses a combination of a rigid stationary spring and a flexible moving spring. On the one hand, the moving spring is a bent flexible thin sheet. When the bending angle is large, the bending accuracy is not high, and the structural stability is poor. On the other hand, when the bending angle is small, the moving spring undergoes frequent high-stress deformation to meet the overtravel requirements of the contact, which easily leads to fatigue fracture and poor structural reliability.

[0004] Most of the contact parts of existing electromagnetic relays do not have the function of preventing contact sticking. When the contacts are not completely broken and sticking occurs, electric arcs are easily generated, posing a safety hazard. Summary of the Invention

[0005] This invention addresses the technical problems existing in the prior art by providing an electromagnetic relay that prevents contact adhesion. While improving the structural reliability of the moving spring, it can prevent contact adhesion.

[0006] The technical solution adopted by this invention to solve its technical problem is: an electromagnetic relay for preventing contact adhesion, comprising a base, a magnetic circuit portion, and a contact portion, wherein the magnetic circuit portion is mounted on the base; the contact portion comprises a push card and at least one contact unit, wherein the contact unit comprises at least one rigid moving spring with a moving contact and at least one stationary spring portion mounted on the base, wherein the stationary spring portion comprises a flexible stationary spring with a stationary contact and a limiting member, wherein the rigid moving spring is fixed on the push card, and the push card is driven by the armature of the magnetic circuit portion, so that the moving contact on the rigid moving spring and the stationary contact on the flexible stationary spring are in contact or separated; the limiting member is mounted on the base and / or the flexible stationary spring, and the limiting member restricts the degree of deformation of the flexible stationary spring towards the corresponding moving contact, so that the flexible stationary spring, through its flexible feature, satisfies the contact overtravel while preventing the stationary contact and the moving contact from adhering.

[0007] Furthermore, the limiting member is the static spring lead-out piece of the static spring portion, and is electrically connected to the flexible static spring piece.

[0008] Furthermore, the limiting member is engaged with the side of the flexible stationary spring facing the corresponding moving contact, and the limiting member abuts against the flexible stationary spring. The engagement point between the limiting member and the flexible stationary spring is located below the stationary contact.

[0009] Furthermore, the top of the limiting member is a bent section, the upper end of which abuts against the flexible static spring, and the remaining part of the bent section has a gap with the flexible static spring.

[0010] Furthermore, the rigid moving spring includes an integrally formed main piece and multiple supporting pieces. The main piece is fixed on the push card, and the multiple supporting pieces are arranged at intervals along the movement direction of the push card. Each supporting piece extends downward and is provided with a moving contact. Each moving contact on the rigid moving spring faces the same side of the push card in the movement direction. Each supporting piece is paired with a flexible stationary spring and its stationary contact, so that the rigid moving spring and the flexible stationary spring that it cooperates with form multiple contact pairs in series.

[0011] Furthermore, the number of support plates is two, making the rigid moving spring plate in an inverted U-shape.

[0012] Furthermore, the contact unit includes multiple rigid moving springs and multiple flexible stationary springs. The multiple rigid moving springs are arranged at intervals along the movement direction of the push card, and a portion of the rigid moving springs and their cooperating flexible stationary springs form normally open contact pairs, while the remaining rigid moving springs and their cooperating flexible stationary springs form normally closed contact pairs.

[0013] Furthermore, in the direction of movement of the push card, two adjacent flexible stationary springs share the same limiting member; the limiting member shared by the two adjacent flexible stationary springs is Y-shaped.

[0014] Furthermore, the number of contact units is multiple sets, and the multiple sets of contact units are arranged at intervals along a direction perpendicular to the movement direction of the push card; an arc-blocking grid is provided on the base, which separates adjacent contact units; the arc-blocking grid is integrally formed with the base, or the arc-blocking grid is separate from the base and is mounted on the base.

[0015] Furthermore, one or more elastic elements abut against the push card and the base or magnetic circuit portion, the elastic elements providing the push card with a counterforce opposite to the attraction direction of the armature; the position where the elastic element engages with the push card corresponds to the horizontal position where the moving contact and the stationary contact are in contact; the elastic element is a spring.

[0016] Furthermore, the magnetic circuit portion includes a coil assembly and the armature. The coil assembly is horizontal, and the armature is swayably disposed on one side of the coil assembly in the axial direction, with the bottom of the armature fixed to the pusher. A limit frame is provided on the coil assembly, and the bottom of the limit frame cooperates with the pusher and / or the armature to limit the stroke of the armature moving away from the coil assembly.

[0017] Furthermore, the limiting frame is in the shape of an inverted U, and its two sides are respectively engaged with the two sides of the armature in the width direction, and the bottom of the two sides of the limiting frame are respectively engaged with the push card.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. This invention employs a rigid moving spring and a flexible stationary spring in conjunction with a pusher to achieve the closing or opening of the contacts. This solves the problem that frequent high-stress deformation of the moving spring easily leads to fatigue fracture, resulting in poor structural reliability. Simultaneously, the deformation of the flexible stationary spring only needs to satisfy the contact overtravel, thus the deformation is small, the stress level is low, and it meets the requirements of high durability. Furthermore, the limiting component provides a limit to the flexible stationary spring, preventing contact adhesion and eliminating potential safety hazards.

[0020] 2. The rigid moving spring and the push card of the present invention are rigidly fixed, which avoids the problem of foreign matter contaminating the contact points caused by the frequent rotation and wear of the rotating shaft, which is common in existing moving springs connected to the push card via a rotating shaft. This makes the contact reliability of the contact points of the present invention higher.

[0021] 3. The limiting member is the static spring lead-out piece of the static spring part, and is electrically connected to the flexible static spring piece, so that the limiting member and the static spring lead-out piece are combined into one, which can not only reduce one part and save material costs, but also simplify installation and make the overall structure more compact and smaller in size.

[0022] 4. The top of the limiting member is a bent section, the upper end of which abuts against the flexible static spring, and the remaining part of the bent section has a gap with the flexible static spring, so that the present invention can adjust the contact gap and overtravel by adjusting the degree of bending of the bent section of the limiting member.

[0023] 5. The rigid moving spring includes the main plate and multiple supporting plates, forming multiple contact pairs in series with the rigid moving spring and its cooperating flexible stationary spring. This provides multiple contact pairs, offering a forced guiding function based on the limiting member. Furthermore, the series connection of the contact pairs significantly increases the contact gap without increasing the structural volume, thereby greatly improving the breaking capacity of the invention. In addition, each supporting plate of the rigid moving spring is equivalent to a traditional rigid moving spring. These multiple supporting plates are jointly fixed to the main plate by the main plate and the push clip, eliminating the need for independent installation of each supporting plate. This simplifies the installation process of the rigid moving spring and reduces the required installation space, resulting in a more compact structure and smaller size, thus facilitating product miniaturization.

[0024] 6. One or more elastic elements abut against the push card and the base. These elastic elements provide a counterforce to the push card that is opposite to the attraction direction of the armature. The elastic elements are springs, thus transforming the frequent high-stress deformation of existing moving springs into the deformation of springs with excellent elasticity (verified by physical testing, the spring can achieve 10...). 8 (Second compression deformation), thereby significantly improving the reliability of the structure. The position where the elastic element mates with the push card is roughly equivalent to the horizontal position where the moving contact and the stationary contact are in contact, so that the reaction force of the elastic element can be directly applied to the contact position, making the contact reliability of the contact higher and the structure more capable of withstanding impact and vibration.

[0025] 7. An arc-blocking grid is provided on the base. The arc-blocking grid can prevent misconnection between groups in the event of a moving contact falling off or a rigid moving spring breaking, further improving the inter-group reliability of the structure. The arc-blocking grid can separate the contacts between different groups, meeting the requirements of inter-group electrical insulation. The effect is particularly obvious when one or several groups of circuits switch to a large load and another group or several groups switch to a signal load. The arc-blocking grid can not only separate the contacts between different groups and meet the requirements of inter-group electrical insulation, but also increase the cooling area of ​​the arc and improve the arc extinguishing capability.

[0026] 8. The limiting bracket can effectively mitigate the impact force of the armature on the contact part of the present invention under strong impact and vibration conditions. Especially for relays with large armatures, it can effectively prevent the contact part from deforming due to impact and causing relay failure.

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the electromagnetic relay for preventing contact adhesion of the present invention is not limited to the embodiments. Attached Figure Description

[0028] Figure 1 This is a front view of the present invention, as described in Embodiment 1;

[0029] Figure 2 This is Example 1 Figure 1 AA section view;

[0030] Figure 3 This is a side view of the present invention, Embodiment 1;

[0031] Figure 4 This is Example 1 Figure 3 BB cross-sectional view;

[0032] Figure 5 This is a three-dimensional structural diagram of the base and flexible static spring sheet of the present invention in the assembled state, according to Embodiment 1.

[0033] Figure 6 This is a front view of the base, flexible static spring, and limiting member of the present invention in the assembled state according to Embodiment 1.

[0034] Figure 7 This is a side view of the base, flexible static spring, and limiting member of the present invention in the assembled state according to Embodiment 1.

[0035] Figure 8 This is Example 1 Figure 7 CC section view;

[0036] Figure 9 This is a front view of the armature and pusher clip of the present invention in the assembled state according to Embodiment 1;

[0037] Figure 10 This is a schematic diagram of the structure of one type of flexible static spring of the present invention, as shown in Embodiment 1.

[0038] Figure 11 This is a schematic diagram of another flexible static spring sheet according to Embodiment 1 of the present invention;

[0039] Figure 12 This is a three-dimensional structural diagram of the base of the present invention in Embodiment 1;

[0040] Figure 13 This is a three-dimensional structural diagram of the base, flexible static spring, and arc-blocking grid of the present invention in the assembled state, according to Embodiment 2.

[0041] Figure 14 This is Example 2 Figure 13 Top view;

[0042] Figure 15 This is Example 2 Figure 14 DD sectional view;

[0043] Figure 16 This is a three-dimensional structural schematic diagram of the arc-blocking grid of the present invention in Embodiment 2;

[0044] Figure 17 This is an overall sectional view of the present invention in Embodiment 2;

[0045] Figure 18 This is Example 2 Figure 17 An enlarged schematic diagram of section E in the middle;

[0046] Figure 19 This is a partially enlarged cross-sectional view of the base, lead-out feet, and elastic clips of the present invention in the assembled state in Embodiment 3;

[0047] Figure 20 This is a cross-sectional view of the base, lead-out feet, and elastic clips of the present invention in an assembled state, according to Embodiment 3. Detailed Implementation

[0048] 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," "lower," "left," "right," "front," and "rear" 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, 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 invention. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more, and "at least one" means one or more. "And / or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0050] Example 1

[0051] Please see Figures 1-12As shown, an electromagnetic relay for preventing contact adhesion according to the present invention includes a housing 20, a base 1, a magnetic circuit portion 2, and a contact portion. The magnetic circuit portion 2 is mounted on the base 1. The contact portion includes a pusher 5 and at least one contact unit. The contact unit includes at least one rigid moving spring 3 and at least one stationary spring portion mounted on the base 1. The stationary spring portion includes a flexible stationary spring 4 and a limiting member. The flexible stationary spring 4 is mounted on the base 1, and the rigid moving spring 3 is fixed on the pusher 5. The pusher 5 is driven by the armature 21 of the magnetic circuit portion 2, causing the moving contact 31 on the rigid moving spring 3 to contact or separate from the stationary contact 41 on the flexible stationary spring 4. The limiting member is fixed to the base 1 and / or the flexible stationary spring 4, and the limiting member restricts the degree of deformation of the flexible stationary spring 4 in the direction of the corresponding moving contact 31, so that the flexible stationary spring 4 can satisfy the contact overtravel through its flexibility while preventing the stationary contact 41 from sticking to the moving contact 31. The rigid moving spring 3 can be fixed to the push card 5 by riveting or insert injection molding.

[0052] In this embodiment, the limiting member engages with the side of the flexible stationary spring 4 facing the corresponding moving contact 31, and the limiting member abuts against the flexible stationary spring 4. The engagement point between the limiting member and the flexible stationary spring 4 is located below the stationary contact 41. The top of the limiting member is a bent section 61, the upper end of which abuts against the flexible stationary spring 4, and the remaining portion of the bent section 61 has a gap with the flexible stationary spring 4. Thus, by adjusting the degree of bending of the bent section 61 of the limiting member, the position of the bent section 61 abutting against the flexible stationary spring 4 can be changed, thereby achieving the purpose of adjusting the contact gap and overtravel.

[0053] In this embodiment, the limiting member is the static spring lead-out piece 6 of the static spring portion, and it is electrically connected to the flexible static spring piece 4. Therefore, the top of the static spring lead-out piece 6 is used to limit the flexible static spring piece 4, and the lower part of the static spring lead-out piece 6 passes through the base 1 and serves as the lead-out foot of the flexible static spring piece 4. The static spring lead-out piece 6 and the flexible static spring piece 4 are electrically connected by welding, but this is not limited to this. In other embodiments, the static spring lead-out piece and the flexible static spring piece are electrically connected by riveting or other fixing methods. In other embodiments, the limiting member is separately provided from the flexible static spring piece and is an independently fixed stop piece on the base.

[0054] In this embodiment, as Figure 8As shown, the rigid moving spring 3 includes an integrally formed main piece 32 and multiple support pieces 33. The main piece 32 is fixed to the push card 5 (specifically, the main piece 32 is fixed to the bottom of the push card 5 by riveting, but not limited to this). The multiple support pieces 33 are arranged at intervals along the movement direction of the push card 5, and each support piece 33 extends downward and is provided with a moving contact 31. Each moving contact 31 on the rigid moving spring 3 faces the same side of the push card 5 in the movement direction. Each support piece 33 is paired with a flexible stationary spring 4 and its stationary contact 41, so that the rigid moving spring 3 and the flexible stationary spring 4 that it cooperates with form multiple contact pairs in series. The series connection of the contact pairs can significantly increase the contact gap without increasing the structural volume, thereby greatly improving the breaking capacity of the present invention. Specifically, there are two support pieces 33, making the rigid moving spring 3 in an inverted U-shape. Therefore, the rigid moving spring 3 and the two flexible stationary springs 4 cooperate to form two series contact pairs. In this case, the contact gap formed by each rigid moving spring 3 is = L1 + L2, where L1 and L2 are the contact gaps of the two contact pairs, respectively. Figure 8 As shown. In other embodiments, the number of support pieces is three or more. Multiple support pieces of the rigid moving spring are jointly fixed to the main piece, with the main piece and push clip completing the fixation. This eliminates the need for independent installation of each support piece, simplifying the installation process of the rigid moving spring and reducing the installation space required, resulting in a more compact structure and smaller size, thus facilitating product miniaturization.

[0055] In this embodiment, the contact unit includes multiple rigid moving springs 3 and multiple flexible stationary springs 4. The multiple rigid moving springs 3 are arranged at intervals along the movement direction of the push card 5, and a portion of the rigid moving springs 3 and their cooperating flexible stationary springs 4 form normally open contact pairs, while the remaining rigid moving springs 3 and their cooperating flexible stationary springs 4 form normally closed contact pairs. Specifically, there are two rigid moving springs 3, which cooperate with four flexible stationary springs 4, forming a total of four contact pairs in the contact unit. The moving contacts 31 on the two rigid moving springs 3 face opposite directions. Therefore, one rigid moving spring 3 and two of the flexible stationary springs 4 form two normally open contact pairs, and the other rigid moving spring 3 and the remaining two flexible stationary springs 4 form two normally closed contact pairs.

[0056] In this embodiment, two adjacent flexible stationary spring sheets 4 in the direction of movement of the push card 5 share the same limiting member. That is, among the four flexible stationary spring sheets 4, the two middle flexible stationary spring sheets 4 share the same limiting member (i.e., the stationary spring lead-out sheet 6). This limiting member is Y-shaped, and the left and right inclined sections at its top respectively constitute the bent section 61. This limiting member is located between the two middle flexible stationary spring sheets 4 and is electrically connected to the two middle flexible stationary spring sheets 4 by welding or riveting. The two middle flexible stationary spring sheets 4 are each a long sheet body in a Z-shape, such as... Figure 10 As shown. Figure 11 As shown, the two flexible stationary springs 4 on both sides are long straight pieces, and each of the two flexible stationary springs 4 is electrically connected to a limiting member (i.e., a stationary spring lead-out piece 6). The bent section 61 of the limiting member includes two inclined sections and a vertical section located between the two inclined sections. The two inclined sections are located on the same side of the vertical end, and the two inclined sections are inclined in opposite directions. The high end of the upper inclined section abuts against the part of the corresponding flexible stationary spring 4 near the stationary contact 41. The cross-sectional view of the stationary spring lead-out piece 6 corresponding to the two flexible stationary springs 4 on both sides is roughly spoon-shaped, as shown. Figure 8 As shown.

[0057] In this embodiment, the number of contact units is multiple sets, and the multiple sets of contact units are arranged at intervals along a direction perpendicular to the movement direction of the push card 5. An arc-blocking grid 9 is provided on the base 1, which separates adjacent contact units; the arc-blocking grid 9 is integrally formed with the base 1. Specifically, the number of contact units is four sets, such as... Figure 5 , Figure 12 As shown, the arc-blocking grid 9 includes three baffles 91, each baffle 91 used to separate adjacent contact units. The arc-blocking grid 9 prevents accidental connection between groups in the event of a moving contact 31 detachment or a rigid moving spring 3 breakage, further improving the inter-group reliability of the structure. The arc-blocking grid 9 also isolates the switching circuits between groups, reducing mutual interference between loads, especially when one or more circuits switch large loads while another one or more switch signal loads, the effect is significant. Furthermore, the arc-blocking grid 9 not only separates contacts between different groups to meet inter-group electrical insulation requirements, but also increases the arc cooling area, improving arc extinguishing capability.

[0058] In this embodiment, one or more elastic elements abut against the push card 5 and the base 1 or magnetic circuit portion 2. These elastic elements provide a counterforce to the push card 5 opposite to the attraction direction of the armature 21. The position where the elastic element engages with the push card 5 corresponds to the horizontal position where the moving contact 31 contacts the stationary contact 41; that is, the position where the elastic element engages with the push card 5 is consistent with or approximately consistent with the horizontal position where the moving contact 31 contacts the stationary contact 41. Specifically, the elastic element is a spring 8, which aims to enhance the counterforce of the structure. When the electromagnetic relay loses or partially loses its excitation, the spring 8 resists the electromagnetic attraction, thus achieving contact switching. Figure 2 As shown, the number of springs 8 is specifically two, but not limited to this. Each spring 8 is horizontal, and one end of each spring 8 is respectively fitted onto the first positioning post 221 corresponding to the yoke 22. The other end of each spring 8 is respectively fitted onto the second positioning post 51 corresponding to the push card 5. The reaction force of the spring 8 can directly act on the contact point, making the contact reliability of the contact point higher and the structure more resistant to impact and vibration.

[0059] In this embodiment, the magnetic circuit portion 2 includes a coil assembly and an armature 21. The coil assembly is horizontal, and the armature 21 is pivotally mounted on one side of the coil assembly in the axial direction. The bottom of the armature 21 is fixed to the pusher 5. A limit frame 7 is provided on the coil assembly. The bottom of the limit frame 7 cooperates with the pusher 5 and / or the armature 21 to limit the travel of the armature 21 in a direction away from the coil assembly. Specifically, the limit frame 7 is inverted U-shaped, with its top fixed to the upper surface of the horizontal side of the yoke 22. Its two sides respectively cooperate with the two sides of the armature 21 in the width direction. The bottom of the two sides of the limit frame 7 respectively cooperate with the pusher 5. Specifically, the pusher 5 and the bottom of the two sides of the limit frame 7 are respectively provided with overlapping grooves. The setting of the limit frame 7 can effectively alleviate the impact force of the armature 21 on the contact part of the present invention under strong impact and vibration conditions. Especially for relays with a large armature 21, it can effectively avoid the deformation of the contact part caused by impact, which could lead to relay failure.

[0060] In this embodiment, as Figure 4As shown, the coil assembly includes a coil frame 25, enameled wire 26 wound on the coil frame 25, an iron core 27 inserted into the coil frame 25, an L-shaped yoke 22, and a restoring spring 24. The armature 21 is fitted to one axial side of the coil frame 25, and the vertical side of the yoke 22 is fitted to the other axial side of the coil frame 25, and is fixed to the end of the iron core 27 facing the yoke 22 by riveting or welding. The bottom of the vertical side of the yoke 22 is fixedly connected to the base 1, and the first positioning post 221 is located on the vertical side of the yoke 22. The horizontal side of the yoke 22 is fitted above the coil frame 25, and extends towards the armature 21, and is connected to the armature 21 via the restoring spring 24. The restoring spring 24 has a first side, a second side, and a bent portion between the first and second sides; specifically, the restoring spring 24 is approximately L-shaped. The first side of the restoring spring 24 is specifically connected to the upper surface of the horizontal side of the yoke 22, and the second side of the restoring spring 24 is connected to the side of the armature 21 facing away from the yoke 22. A first gap exists between the armature 21 and the horizontal side of the yoke 22. A magnetic guide 23 is provided on the lower surface of the horizontal side of the yoke 22, protruding from the tail end of the horizontal side of the yoke 22 towards the armature 21. The armature 21 has an engaged state and a restored state, and the armature 21 switches its state by oscillation. In the engaged state, the armature 21 is in contact with the magnetic guide 23; in the restored state, a second gap exists between the armature 21 and the magnetic guide 23, which is smaller than the first gap. The armature 21 and the magnetic guide 23 are in surface contact in the contact state, but this is not limited to this; in other embodiments, the armature and the magnetic guide are in line contact in the contact state.

[0061] In this embodiment, the magnetic conductive element 23 is connected to the inner surface of the horizontal side of the yoke 22, and the size of the second spacing is adjustable. The material of the magnetic conductive element 23 can be the same as that of the yoke 22, and the magnetic conductive element 23 is sheet-shaped, but not limited to this. In other embodiments, the magnetic conductive element 23 is integrally formed with the yoke 22.

[0062] In this embodiment, the horizontal side of the yoke 22 has a connecting hole. The magnetic conductor 23 is connected to the horizontal side of the yoke 22 by a fastener passing through the connecting hole. The fastener can move relative to the connecting hole towards or away from the armature 21, thereby adjusting the second gap. The connecting hole is an elongated hole, specifically a waist-shaped hole, extending parallel to the axial direction of the coil frame 25. The fastener is specifically a screw 28, which is threadedly connected to the magnetic conductor 23. In other embodiments, the fastener is a rivet, which is riveted to the magnetic conductor 23. The number of fasteners (i.e., screws) is two, but not limited to this, and the two screws are arranged along the width direction of the armature 21.

[0063] In this embodiment, the restoring spring 24 is connected to the upper surface of the horizontal side of the yoke 22 by the fastener (i.e., screw 28). That is, the screw passes through the first side of the restoring spring 24 and the horizontal side of the yoke 22 in sequence, and then is threadedly connected to the threaded hole on the magnetic conductor 23. The corners of the two sides of the restoring spring 24 are rounded, and the second side of the restoring spring 24 is riveted and fixed to the armature 21.

[0064] In this embodiment, the outer casing 20 (see Figure 17 The lower end of the outer shell 20 (as shown) is open, and the lower end of the outer shell 20 is snapped together with the base 1. The two enclose the magnetic circuit part 2 and the contact part in the cavity formed by the outer shell 20 and the base 1.

[0065] In this embodiment, the invention further includes a lamp holder portion 29, which is mounted on the yoke 22. Specifically, the lamp holder portion 29 is fixed to the horizontal side of the yoke 22. The lamp holder portion 29 embeds electronic components such as coil protection elements and indicator lights. These electronic components are connected in parallel with part or all of the coil to obtain electrical energy. The coil frame 25 is provided with multiple solder pads. Some solder pads are connected to the coil leads via wires, and other solder pads serve as intermediate taps of the coil, dividing the total coil composed of the enameled wire 26 into several sub-coils, each used to power the electronic components of the lamp holder portion 29.

[0066] In this embodiment, the leads of the stationary spring portion and the leads of the magnetic circuit portion 2 (i.e., coil leads) are respectively inserted into the corresponding insertion holes 11 on the base 1, and are restrained by elastic retainers 10. Specifically, the elastic retainers 10 are inserted into the insertion holes 11 of the base 1, causing the leads to abut against the inner side of the insertion holes 11. Figure 8As shown, this design prevents the lead-out pin from wobbling in the socket 11, and also eliminates the need for clips or cuts on the lead-out pin to ensure an interference fit with the socket 11, thus preventing the generation of plastic shavings. The elastic clip 10 smoothly engages with the inner surface of the socket 11, further preventing the generation of plastic shavings. The elastic clip 10 includes at least one first arc-shaped bend protruding towards the lead-out pin and at least one second arc-shaped bend protruding away from the lead-out pin. The first and second arc-shaped bends are arranged along the depth direction of the socket 11, and adjacent first and second arc-shaped bends smoothly transition, making the elastic clip approximately wavy.

[0067] This invention discloses an electromagnetic relay for preventing contact sticking. When a certain excitation is applied to the magnetic circuit section 2, the pusher 5 moves with the armature 21 in the direction of attraction with the iron core 27, causing the normally open contacts to close and the normally closed contacts to open. When the excitation is removed from the magnetic circuit section 2, the pusher 5 moves with the armature 21 in the direction away from the iron core 27, causing the normally open contacts to open and the normally closed contacts to close, thereby achieving circuit switching. During the process of removing the excitation from the magnetic circuit section 2, both the restoring spring 24 and the spring 8 can provide reaction force to assist the armature 21 and the pusher 5 in restoring their original state. In particular, this invention completely transforms the frequent high-stress deformation of the existing moving spring into the deformation of the spring 8 with excellent elastic performance (verified by physical testing, the spring 8 can achieve 10... 8 Secondary compression deformation significantly improves the reliability of the structure.

[0068] The flexible stationary spring 4 of this invention adopts a long flat or long Z-shaped design with greater flexibility, and the deformation of the flexible stationary spring 4 only needs to meet the contact overtravel (the deformation of existing moving springs is the sum of contact overtravel and contact gap). Therefore, the deformation is small, the stress level is low, and the high durability requirements are met. The stationary spring lead-out piece 6 connected to the flexible stationary spring 4 limits the flexible stationary spring 4, which can prevent the contacts from sticking together and prevent the other side of the normally closed contact pair or normally open contact pair from connecting the circuit when the normally open contact pair or normally closed contact pair is welded. At the same time, this design can ensure that the corresponding sides of the welded contact pair maintain a certain safe distance, which meets the forced guiding function.

[0069] The armature and yoke are designed to be separate, which avoids wear caused by contact between the armature and yoke during operation. This solves the problem of relay jamming or abnormal contact due to wear of the yoke blade. The magnetic conductor ensures a closed magnetic circuit is formed when the armature and yoke are separated, guaranteeing reliable relay operation. Furthermore, the larger initial gap allows for a larger radius at the corners (rounded corners) of the spring, ensuring its long-lasting operation and preventing breakage. Furthermore, the armature is separated from the magnetic conductor in the restored state, so that when the armature moves, it will not immediately rotate around the magnetic conductor as a fulcrum, thereby reducing wear on the magnetic conductor. The armature and the magnetic conductor are in surface or line contact rather than point contact in the contact state, which can further reduce the wear of the armature on the magnetic conductor. When the armature and the magnetic conductor are in contact, the weight of the entire armature and electromagnetic relay contact system is borne by the restoring spring, and the magnetic conductor is not under load, which can further reduce the wear on the magnetic conductor, thereby ensuring that the magnetic conductor can work for a long time.

[0070] The second gap is adjustable, allowing the magnetic circuit drop of the relay's magnetic circuit system to be adjusted according to the relative position of the magnetic conductor and the armature, thereby adjusting the product's overtravel and electrical parameters. The magnetic circuit drop refers to the distance between the surface of the magnetic conductor that contacts the armature and the end of the magnetic circuit system's core used to connect to the second side of the yoke. Specifically, the second gap can be adjusted by changing the mating position of the magnetic conductor and the connecting hole (which is a waist-shaped hole), achieving the purpose of adjusting the product's electrical and mechanical parameters before product completion.

[0071] After adopting the above structure, the coil assembly not only has high magnetic conductivity, but also achieves structural flexibility. This allows the working air gap and magnetic circuit drop of the magnetic circuit part 2 to be changed by adjusting the relative positions of the parts, thereby adjusting the product's operating voltage and release voltage. This solves the problem that the magnetic circuit part of the relay in the prior art has a small or no adjustment space, resulting in poor product correctability.

[0072] Example 2

[0073] Please see Figures 13-18 As shown, the electromagnetic relay for preventing contact adhesion of the present invention differs from the above embodiment 1 in that: the arc-blocking grid 9 is separate from the base 1, and the arc-blocking grid 9 is detachably mounted on the base 1.

[0074] In this embodiment, the arc-blocking grid 9 includes three elongated baffles 91 and one side baffle 92. The three baffles 91 are arranged in parallel, and one end of each baffle 91 is integrally formed with the same side of the side baffle 92. The other end of the middle baffle 91 is provided with a mounting post 911, which is inserted into the mounting hole 12 corresponding to the base 1. Figure 15 As shown. One or more limiting protrusions 921 are provided at the bottom of one side of the side panel 92 facing away from the retaining wall 91. The bottom of the inner side of the outer casing 20 is provided with limiting grooves 201 corresponding to the limiting protrusions 921. The limiting protrusions 921 and the limiting grooves 201 engage one-to-one, as shown. Figure 17 , Figure 18 As shown, this restricts the displacement of the arc-blocking grid 9 in the length direction of its retaining wall 91.

[0075] The present invention provides an electromagnetic relay for preventing contact adhesion. The parts not described herein are the same as or can be implemented using existing technologies.

[0076] Example 3

[0077] Please see Figure 19 , Figure 20 As shown, the electromagnetic relay for preventing contact adhesion according to the present invention differs from the first embodiment described above in that: the elastic clip 10 is snapped together with the lead-out pin 30 to prevent the elastic clip 10 from falling out of the insertion hole 11 of the base 1. The lead-out pin 30 can be a lead-out pin of the stationary spring portion or a coil lead-out pin of the magnetic circuit portion.

[0078] In this embodiment, the limiting portion provided on the elastic retainer 10 and / or the lead-out pin 30 restricts the movement of the lead-out pin 30 along the depth direction of the insertion hole 11, and the limiting portion rests against the base 1. The insertion hole 11 is vertically continuous, and the lead-out pin 30 is specifically inserted into the insertion hole 11 from top to bottom. The elastic retainer 10 is inserted into the insertion hole 11 from the lower end of the insertion hole 11. The lead-out pin 30 is a sheet-shaped lead with a square cross-section. The elastic retainer 10 is located on one side of the lead-out pin 30 in the thickness direction. The portion of the elastic retainer 10 away from the lead-out pin 30 in the thickness direction contacts and engages with the inner surface of the insertion hole 11, and the elastic retainer 10 smoothly engages with the inner surface of the insertion hole 11.

[0079] In this embodiment, as Figure 19As shown, the elastic locking member 10 is provided with one or more wedge-shaped locking blocks 103, and the lead-out foot 30 is provided with locking holes 301 that engage with the wedge-shaped locking blocks 103 one by one. The locking holes 301 penetrate through both ends of the lead-out foot 30 in the thickness direction. The locking holes 301 can be replaced by locking grooves or the like. The number of wedge-shaped locking blocks 103 and locking holes 301 is specifically two, but not limited to this. The two locking holes 301 are arranged along the width direction of the lead-out foot 30, and the positions of the two wedge-shaped locking blocks 103 correspond one-to-one with the two locking holes 301.

[0080] In this embodiment, as Figure 19 As shown, the elastic locking member 10 includes at least one first arc-shaped bend 101 protruding towards the lead-out foot 30 and at least one second arc-shaped bend 102 protruding away from the lead-out foot 30. The first arc-shaped bend 101 and the second arc-shaped bend 102 are arranged alternately along the depth direction of the insertion hole 11, and the first arc-shaped bend 101 is located between the plurality of second arc-shaped bends 102. Adjacent first arc-shaped bends 101 and second arc-shaped bends 102 are smoothly transitioned. Specifically, there is one first arc-shaped bend 101 and two second arc-shaped bends 102, but it is not limited to this. The first arc-shaped bend 101 is located between two second arc-shaped bends 102. The first arc-shaped bend 101 is provided with the wedge-shaped locking block 103, and each second arc-shaped bend 102 contacts and engages with the inner surface of the insertion hole 11. Thus, the elastic clip 10 is roughly wavy, which not only makes the elastic clip 10 have good elastic deformation capability, but also ensures that the elastic clip 10 and the inner side of the socket 11 have a smooth fit.

[0081] In this embodiment, the insertion hole 11 includes a through hole 111 extending through both ends and a recessed groove 112 open at one end and closed at the other. The through hole 111 and the recessed groove 112 are laterally connected. The lead-out foot 30 is inserted into the through hole 111, and the portion of the lead-out foot 30 in the through hole 111 is adapted to the through hole 111. That is, the shape and size of the portion of the lead-out foot 30 in the through hole 111 are consistent with or substantially consistent with the shape and size of the through hole 111, so that the lead-out foot 30 will not or substantially not move along the width and thickness directions of the lead-out foot 30 in the through hole 111. Specifically, the lower end of the recessed groove 112 is open and the upper end is closed. The elastic retainer 10 is inserted into the recessed groove 112 from one end (i.e., the lower end) and is restricted by the upper end of the recessed groove 112, so that the elastic retainer 10 cannot move upward in the recessed groove 112. The limiting part is located at the other end of the socket 11, specifically, the limiting part is located at the upper end of the socket 11, such as... Figure 6 As shown.

[0082] In this embodiment, as Figure 20 As shown, the limiting part includes two limiting steps 302, which are located on opposite sides of the lead-out foot 30 in the width direction. The step surfaces of the two limiting steps 302 face the inward direction of the insertion hole 11 and rest against the upper surface of the base 1. Figure 20 As shown. In other embodiments, the limiting part is a retaining ring or the like that fitted onto the lead-out foot.

[0083] In this invention, an electromagnetic relay for preventing contact adhesion is provided. When assembling the lead-out pin 30, the lead-out pin 30 is first inserted into the through hole 111 from top to bottom. Then, the wedge-shaped locking blocks 103 of the elastic locking member 10 are aligned with the lead-out pin 30, and the elastic locking member 10 is inserted into the recess 112 from bottom to top. During the insertion of the elastic locking member 10 into the recess 112, the inclined surfaces of each wedge-shaped locking block 103 of the elastic locking member 10 provide guidance, ensuring smooth insertion of the elastic locking member 10. The elastic locking member 10 is in a compressed state. When the elastic locking member 10 is fully inserted, each wedge-shaped locking block 103 of the elastic locking member 10 engages with its corresponding locking hole 301. Figure 19 As shown, this effectively prevents the elastic clip 10 from moving downwards. Simultaneously, the elastic clip 10 elastically resets, with each of its second arc-shaped bends 102 contacting the inner side of the recess 112 away from the lead-out foot 30, and its first arc-shaped bend 101 abutting against the lead-out foot 30. This causes the lead-out foot 30 to abut against the inner side of the through hole 111 away from the recess 112, making the lead-out foot 30 more stable and less prone to wobbling within the through hole 111. After assembly, the step surfaces of the two limiting steps 302 of the lead-out foot 30 rest against the upper surface of the base 1, thus restricting the downward movement of the lead-out foot 30. Since the elastic clip 10 will not move upwards under the constraint of the recess 112, and the elastic clip 10 is snapped together with the lead-out foot 30, the elastic clip 10 forms an upper limit on the lead-out foot 30, preventing it from moving upwards. In addition, the elastic clip 10 provides elastic support to the lead 30, so that the lead 30 abuts against the inner side of the socket 11, and the lead 30 will not be displaced in the width or thickness direction in the through hole 111. Therefore, the lead 30 can be firmly confined in the socket 11, thereby greatly improving the insertion and extraction force of the lead 30.

[0084] The present invention provides an electromagnetic relay for preventing contact adhesion, which achieves a chip-free insertion method for the leads and eliminates the need for glue fixation. This avoids the risk of plastic chips increasing the risk of product non-conductivity, and also avoids the problem that the insertion and extraction force of the leads will be severely reduced after the glue softens at high temperature when using glue fixation.

[0085] The above embodiments are only used to further illustrate an electromagnetic relay for preventing contact adhesion 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 for preventing contact adhesion, comprising a base, a magnetic circuit portion, and a contact portion, wherein the magnetic circuit portion is mounted on the base; the contact portion comprises a push-type latch and at least one contact unit, characterized in that: The contact unit includes at least one rigid moving spring with a moving contact and at least one stationary spring portion mounted on the base. The stationary spring portion includes a flexible stationary spring with a stationary contact and a limiting member. The rigid moving spring is fixed on a push card, which is driven by the armature of the magnetic circuit portion, causing the moving contact on the rigid moving spring to contact or separate from the stationary contact on the flexible stationary spring. The limiting member is mounted on the base and / or the flexible stationary spring, and the limiting member restricts the degree of deformation of the flexible stationary spring towards the corresponding moving contact, so that the flexible stationary spring can satisfy the contact overtravel through its flexibility while preventing the stationary contact and the moving contact from sticking together. The rigid moving spring includes a main plate and multiple supporting plates. The main plate is fixed on the push card, and the multiple supporting plates are fixed to the main plate and arranged at intervals along the movement direction of the push card. Each supporting plate is provided with the moving contact. Each supporting plate is paired with a flexible stationary spring and its stationary contact, so that the rigid moving spring and the flexible stationary spring that it cooperates with form multiple contact pairs in series.

2. The electromagnetic relay for preventing contact adhesion according to claim 1, characterized in that: The limiting member is the static spring lead-out piece of the static spring portion, and is electrically connected to the flexible static spring piece.

3. The electromagnetic relay for preventing contact adhesion according to claim 1 or 2, characterized in that: The limiting member engages with the side of the flexible stationary spring facing the corresponding moving contact, and the limiting member abuts against the flexible stationary spring. The engagement point between the limiting member and the flexible stationary spring is located below the stationary contact.

4. The electromagnetic relay for preventing contact adhesion according to claim 3, characterized in that: The top of the limiting member is a bent section, the upper end of which abuts against the flexible static spring, and the remaining part of the bent section has a gap with the flexible static spring.

5. The electromagnetic relay for preventing contact adhesion according to claim 1, characterized in that: The main piece and multiple support pieces are integrally formed; each support piece extends downwards; each moving contact on the rigid moving spring faces the same side of the push plate in the direction of movement.

6. The electromagnetic relay for preventing contact adhesion according to claim 5, characterized in that: The number of the support plates is two, making the rigid moving spring plate in an inverted U-shape.

7. The electromagnetic relay for preventing contact adhesion according to claim 1, 2, 5, or 6, characterized in that: The contact unit includes multiple rigid moving springs and multiple stationary spring sections. The multiple rigid moving springs are arranged at intervals along the movement direction of the push card, and a portion of the rigid moving springs and their cooperating flexible stationary springs form normally open contact pairs, while the remaining rigid moving springs and their cooperating flexible stationary springs form normally closed contact pairs.

8. The electromagnetic relay for preventing contact adhesion according to claim 1, characterized in that: Two flexible stationary springs that are adjacent to each other and whose stationary contacts face each other in the direction of movement of the push card share the same limiting member; the limiting member shared by the two adjacent flexible stationary springs is Y-shaped.

9. The electromagnetic relay for preventing contact adhesion according to claim 1, 2, 5, or 6, characterized in that: The number of contact units is multiple sets, and the multiple sets of contact units are arranged at intervals along a direction perpendicular to the movement direction of the push card; an arc-blocking grid is provided on the base, which separates adjacent contact units; the arc-blocking grid is integrally formed with the base, or the arc-blocking grid is separate from the base and is mounted on the base.

10. The electromagnetic relay for preventing contact adhesion according to claim 1, 2, 5, or 6, characterized in that: One or more elastic elements abut against the push card and the base or magnetic circuit portion. The elastic elements provide the push card with a counterforce opposite to the attraction direction of the armature. The position where the elastic elements cooperate with the push card is equivalent to the horizontal position where the moving contact and the stationary contact are in contact. The elastic elements are springs.

11. The electromagnetic relay for preventing contact adhesion according to claim 1, 2, 5, or 6, characterized in that: The magnetic circuit includes a coil assembly and an armature. The coil assembly is horizontal, and the armature is pivotally disposed on one side of the coil assembly in the axial direction. The bottom of the armature is fixed to the pusher. A limit frame is provided on the coil assembly. The bottom of the limit frame cooperates with the pusher and / or the armature to limit the stroke of the armature moving away from the coil assembly.

12. The electromagnetic relay for preventing contact adhesion according to claim 11, characterized in that: The limiting frame is in the shape of an inverted U, and its two sides are respectively engaged with the two sides of the armature in the width direction. The bottom of the two sides of the limiting frame are respectively engaged with the push card.

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