Electromagnetic relay
By setting permanent magnets on the push card to correspond to the stationary and moving contacts, the arc extinguishing effect is enhanced, solving the problems of poor arc extinguishing effect and large size of existing relays, and achieving miniaturization and cost reduction.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- XIAMEN HONGFA ELECTRIC POWER CONTROLS CO LTD
- Filing Date
- 2025-12-19
- Publication Date
- 2026-06-25
AI Technical Summary
Existing relays have poor arc-extinguishing performance and are bulky, resulting in a short service life.
A permanent magnet is set on the push card, so that the permanent magnet corresponds to at least one of the stationary contact and the moving contact. The magnetic field formed by the permanent magnet is used to extinguish the arc, and the permanent magnet is fixed on the push card by an anti-detachment structure. The permanent magnet moves with the push card to enhance the arc extinguishing effect.
It improves arc extinguishing effect, reduces the weight and size of the push card, reduces coil power consumption, lowers cost, and improves the versatility and reliability of the relay.
Smart Images
Figure CN2025143818_25062026_PF_FP_ABST
Abstract
Description
Electromagnetic relay
[0001] Related applications
[0002] This application claims priority to Chinese patent application No. 2024118967817, filed on December 20, 2024, entitled "Electromagnetic Relay", the entire contents of which are incorporated herein by reference. Technical Field
[0003] This application relates to the field of relay technology, and in particular to an electromagnetic relay. Background Technology
[0004] A relay is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit). It is often used in automatic control circuits, where relays play roles such as automatic adjustment, safety protection, and circuit switching.
[0005] A relay consists of a stationary spring, a stationary contact on the stationary spring, a moving spring, and a moving contact on the moving spring. When the stationary and moving contacts disconnect, an electric arc is usually generated. This arc can easily burn the surfaces of both the stationary and moving contacts. Furthermore, without arc ignition, the arc can propagate erratically, causing the relay to fail. To improve the relay's lifespan, it incorporates a permanent magnet for arc extinguishing. The magnetic field generated by this magnet elongates the arc, thus extinguishing it. However, common relays often have poor arc extinguishing performance and are bulky. Summary of the Invention
[0006] Therefore, it is necessary to provide an electromagnetic relay that avoids increasing the size of the relay.
[0007] An electromagnetic relay, comprising:
[0008] armature assembly;
[0009] A stationary spring assembly, the stationary spring assembly including a stationary spring sheet and a stationary contact disposed on the stationary spring sheet;
[0010] A movable spring assembly, comprising a movable spring sheet and a movable contact disposed on the movable spring sheet, the movable contact being disposed opposite to the stationary contact;
[0011] A pusher, connected to the armature assembly and the movable spring, the pusher capable of pushing the movable spring to move, causing the movable contact to contact and disconnect from the stationary contact; and
[0012] A permanent magnet is disposed on the push card; the permanent magnet corresponds to at least one of the stationary contact and the moving contact; the magnetic field formed by the permanent magnet is used to extinguish the arc.
[0013] The aforementioned electromagnetic relay incorporates a permanent magnet within a push-card mechanism. This permanent magnet corresponds to at least one of the stationary or moving contacts. Under the action of the push-card, the permanent magnet remains extremely close to both the stationary and moving contacts, meaning it remains extremely close to the arc-initiating point. This results in a stronger magnetic field at the arc-initiating point, leading to better arc extinguishing. Furthermore, a permanent magnet achieving the same magnetic efficiency can be smaller and lighter, reducing the weight of the push-card and lowering coil power consumption, thus facilitating miniaturization and cost reduction. Since the permanent magnet is located inside the electromagnetic relay and within the push-card mechanism, no additional space is needed for it, further contributing to miniaturization. This design also allows for versatility without altering other aspects of the electromagnetic relay's structure. Moreover, because the permanent magnet can move with the push-card mechanism, it does not need to cover the stationary and moving contacts, further reducing its size and weight.
[0014] In one embodiment, the permanent magnet is positioned directly opposite at least one of the stationary contact and the moving contact. This results in a better arc-extinguishing effect.
[0015] In one embodiment, the push card has a first end and a second end opposite to each other, the first end being connected to the armature assembly, the second end being connected to the movable spring, the permanent magnet being disposed at the second end, and the permanent magnet being spaced apart from the movable spring.
[0016] In one embodiment, the push card is provided with a receiving slot, and the permanent magnet is fixed in the receiving slot.
[0017] In one embodiment, the push card further includes an anti-detachment structure disposed within the receiving groove, which is used to fix the permanent magnet. Under the action of the anti-detachment structure, the permanent magnet can be fixed within the receiving groove, preventing it from detaching and ensuring the arc extinguishing effect.
[0018] In one embodiment, the anti-detachment structure includes anti-detachment clips, with at least two clips provided. All clips are located on the wall of the receiving groove and are engaged with the permanent magnet on the side near the opening of the receiving groove. This improves the convenience and reliability of permanent magnet assembly.
[0019] In one embodiment, the anti-detachment structure includes an anti-detachment buckle and an anti-detachment cover plate. The anti-detachment buckle and the anti-detachment cover plate are respectively disposed on two opposite sidewalls of the receiving groove. There is a gap between the anti-detachment buckle and the anti-detachment cover plate for inserting the permanent magnet. The anti-detachment buckle is engaged with the first end of the permanent magnet near the opening of the receiving groove, and the anti-detachment cover plate covers the second end of the permanent magnet near the opening of the receiving groove. Thus, the anti-detachment buckle and the anti-detachment cover plate cooperate to fix the permanent magnet in the receiving groove, preventing the permanent magnet from detaching and ensuring the arc extinguishing effect. It also avoids the risk of fixation failure due to glue aging in permanently magnets fixed with adhesive, improving the reliability of the permanent magnet assembly. Furthermore, only the interference fit on one side needs to be controlled, reducing the risk of anti-detachment buckle failure.
[0020] In one embodiment, the bottom wall of the receiving groove is provided with a through hole, which corresponds to the anti-detachment cover. When the permanent magnet is obliquely assembled into the receiving groove, the through hole allows the second end of the permanent magnet to be inserted. This facilitates demolding and, during the oblique assembly of the permanent magnet into the receiving groove, allows the second end of the permanent magnet to extend into the through hole, preventing interference from the anti-detachment cover and reducing the deformation of the anti-detachment latch, thereby mitigating the risk of latch failure.
[0021] In one embodiment, the anti-detachment structure includes a fixing member, which comprises a mounting arm and a cover plate. The mounting arm is disposed between the permanent magnet and the side wall of the receiving groove, with each of the opposite sides of the mounting arm corresponding to one of the two opposite side walls of the receiving groove. The cover plate is connected to the mounting arm and covers the side of the permanent magnet near the opening of the receiving groove. Thus, the cover plate acts as a limit, confining the permanent magnet within the receiving groove, preventing it from detaching, and improving the reliability of the permanent magnet assembly.
[0022] In one embodiment, anti-reverse locking teeth are provided on opposite sides of the mounting arm, and the anti-reverse locking teeth are interference-fitted with the sidewall of the receiving groove. This improves the reliability of the fastener assembly.
[0023] In one embodiment, the bottom wall of the receiving groove has two through holes, which are respectively located on both sides of the bottom wall of the receiving groove along the arrangement direction of the stationary spring assembly and the moving spring assembly. Two fixing members are provided, with their mounting arms correspondingly disposed in the two through holes. One mounting arm of the fixing member is located on one side of the stationary contact and the moving contact, while the mounting arm of the other fixing member is located on the other side. In this way, the mounting arms can block the electric arc, preventing it from striking the plastic part.
[0024] In one embodiment, the permanent magnet has a first polarity and a second polarity, which are located at opposite ends of the permanent magnet along the depth direction of the receiving groove. This ensures that the arc blowing direction is left-right, preventing the electric arc from hitting the push card and thus avoiding the push card from being melted by the electric arc, thereby preventing product failure.
[0025] In one embodiment, the permanent magnet has a first polarity and a second polarity, which are located at opposite ends of the permanent magnet along the length of the receiving groove, and the length of the receiving groove is perpendicular to the arrangement direction of the stationary spring assembly and the moving spring assembly.
[0026] In one embodiment, the stationary spring assembly further includes a magnetic conductor disposed on the stationary spring sheet. Thus, the magnetic conductor can concentrate magnetism, increase the magnetic field lines returning from the N pole to the S pole of the permanent magnet, reduce magnetic loss, and ensure arc extinguishing effect.
[0027] In one embodiment, the electromagnetic relay further includes an arc-blocking component, comprising a first arc-blocking portion and a second arc-blocking portion. The first arc-blocking portion is located on one side of the stationary spring assembly and the moving spring assembly along their respective arrangement directions, and the second arc-blocking portion is located on the other side of the stationary spring assembly and the moving spring assembly along their respective arrangement directions. Thus, the first and second arc-blocking portions can block the electric arc, preventing it from striking the plastic component. Attached Figure Description
[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the disclosed drawings without creative effort.
[0029] Figure 1 is a schematic diagram of the structure of an electromagnetic relay according to one embodiment of this application.
[0030] Figure 2 is a partial structural schematic diagram of an electromagnetic relay according to an embodiment of this application.
[0031] Figure 3 is a schematic diagram of the structure of an electromagnetic relay according to another embodiment of this application.
[0032] Figure 4 is a right view of the electromagnetic relay shown in Figure 3.
[0033] Figure 5 is a schematic diagram of the structure after the push card and permanent magnet shown in Figure 3 are assembled.
[0034] Figure 6 is a top view of the push card and permanent magnet shown in Figure 5 after assembly.
[0035] Figure 7 is a schematic diagram of the push card shown in Figure 5.
[0036] Figure 8 is a schematic diagram of the structure of an electromagnetic relay according to another embodiment of this application.
[0037] Figure 9 is a cross-sectional view along AA in Figure 8.
[0038] Figure 10 is a schematic diagram of the permanent magnet obliquely assembled into the push card as shown in Figure 9.
[0039] Figure 11 is a top view of the push card shown in Figure 9.
[0040] Figure 12 is a schematic diagram of the structure of an electromagnetic relay according to another embodiment of this application.
[0041] Figure 13 is a right view of the electromagnetic relay shown in Figure 12.
[0042] Figure 14 is an exploded view of the push card and fixing component shown in Figure 12.
[0043] Figure 15 is a schematic diagram of the structure of a static spring assembly according to an embodiment of this application.
[0044] Figure 16 is a schematic diagram of the magnetic conductor shown in Figure 15.
[0045] Reference numerals in the attached figures: 10. Armature assembly; 11. Armature; 20. Stationary spring assembly; 21. Stationary spring; 211. Protrusion; 22. Stationary contact; 23. Magnetic conductor; 231. Main body; 2311. First connecting hole; 2312. Clearance groove; 232. First side wall; 233. Second side wall; 30. Moving spring assembly; 31. Moving spring; 32. Moving contact; 40. Push latch; 41. First end; 42. Second end; 421. Receiving groove; 4211. Through hole ; 4212, receiving groove; 422, anti-detachment buckle; 4221, connecting arm; 4222, fastening part; 423, anti-detachment cover plate; 424, fixing part; 4241, mounting arm; 4242, cover plate part; 4243, anti-retraction tooth; 50, permanent magnet; 51, first polarity; 52, second polarity; 60, arc-blocking part; 61, first arc-blocking part; 62, second arc-blocking part; 63, connecting part; 70, coil; 80, yoke; 90, base. Detailed Implementation
[0046] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. To make the above-mentioned objects, features and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0047] Referring to Figures 1 and 2, an embodiment of the electromagnetic relay provided in this application includes a base 90, an armature assembly 10, a stationary spring assembly 20, a moving spring assembly 30, and a pusher 40.
[0048] Both the stationary spring assembly 20 and the moving spring assembly 30 are mounted on the base 90. The stationary spring assembly 20 and the moving spring assembly 30 are arranged along a first direction, which is represented by X. The stationary spring assembly 20 includes a stationary spring plate 21 and a stationary contact 22, with the stationary contact 22 located on the side of the stationary spring plate 21 facing the moving spring assembly 30. The moving spring assembly 30 includes a moving spring plate 31 and a moving contact 32, with the moving contact 32 located on the side of the moving spring plate 31 facing the stationary spring assembly 20. The stationary contact 22 and the moving contact 32 are arranged opposite to each other.
[0049] It should be noted that the stationary contact 22 and the stationary spring 21 are either integrated or separately connected. The moving contact 32 and the moving spring 31 are either integrated or separately connected.
[0050] The pusher 40 is located at the same end of the armature assembly 10 and the moving spring assembly 30. Taking Figure 2 as an example, the same end of the armature assembly 10 and the moving spring assembly 30 refers to the upper end of the armature assembly 10 and the upper end of the moving spring assembly 30. In the first direction, the pusher 40 has a first end 41 and a second end 42. The first end 41 is connected to the armature assembly 10, and the second end 42 is connected to the moving spring 31. The pusher 40 can push the moving spring assembly 30 to make the moving contact 32 contact or disconnect from the stationary contact 22.
[0051] Of course, in other embodiments, the armature assembly 10 may be connected to the push card 40 at other positions except the first end 41, and the movable spring 31 may be connected to the push card 40 at other positions except the second end 42, and is not limited thereto.
[0052] In one embodiment, referring to FIG2, the armature assembly 10 includes a permanent magnet (not shown) and two armatures 11. The permanent magnet is disposed between the two armatures 11 and is integrally molded with the outer plastic part. A push arm is formed on the plastic material and is connected to the push card 40.
[0053] Furthermore, the electromagnetic relay also includes a coil 70 and a yoke 80. The yoke 80 is mounted on a coil frame, and the coil 70 is wound around the coil frame. The yoke 80 and the armature cooperate to form a closed magnetic circuit. When a forward or reverse current flows through the coil 70, the armature assembly 10 rotates around its axis, causing the moving spring 31 to move. Specifically, when a forward current flows through the coil 70, the armature assembly 10 rotates around its axis under magnetic force, pushing the pusher 40 towards the stationary spring assembly 20. The pusher 40 then pushes the moving spring assembly 30 towards the stationary spring assembly 20, causing the stationary contact 22 to contact the moving contact 32, thereby connecting the circuit. When a reverse current flows through the coil 70, the armature assembly 10 rotates in the opposite direction under magnetic force, pushing the pusher 40 away from the stationary spring assembly 20. The pusher 40 then pushes the moving spring assembly 30 away from the stationary spring assembly 20, causing the stationary contact 22 to separate from the moving contact 32.
[0054] When the stationary contact 22 is disconnected from the moving contact 32, an electric arc will be generated between them. This arc will burn the surfaces of both the stationary and moving contacts. Furthermore, without arc ignition, the arc will propagate erratically, leading to product failure. Therefore, in this embodiment, referring to Figures 1 and 2, the electromagnetic relay also includes a permanent magnet 50, which is located at the second end 42 of the push card 40. The arc generated between the stationary and moving contacts 32 is subjected to force and moves under the magnetic field generated by the permanent magnet 50, causing the arc to be rapidly elongated and extinguished. This prevents the arc from burning the surfaces of the stationary and moving contacts 32 and also avoids the arc from propagating erratically and causing product failure.
[0055] Of course, in other embodiments, the permanent magnet 50 may also be located at other positions on the push card 40 other than the second end 42, as long as the permanent magnet 50 corresponds to at least one of the stationary contact 22 and the moving contact 32.
[0056] It should be noted that, referring to Figures 2 and 8, in this embodiment, although the connection position between the movable spring 31 and the push card 40 and the permanent magnet 50 are both located at the second end 42 of the push card 40, the movable spring 31 and the permanent magnet 50 are spaced apart. In this embodiment, the connection position between the push card 40 and the movable spring 31 is located between the permanent magnet 50 and the first end 41, and the connection position between the push card 40 and the movable spring 31 is close to the permanent magnet 50.
[0057] By setting a permanent magnet 50 in the push card 40, the permanent magnet 50 corresponds to at least one of the stationary contact 22 and the moving contact 32. Under the action of the push card 40, the permanent magnet 50 can approach the stationary contact 22 and the moving contact 32 to the extreme, that is, the permanent magnet 50 can approach the arc initiation point to the extreme. This results in a stronger magnetic field strength acting on the arc initiation point, a better arc extinguishing effect, and at the same magnetic efficiency, the permanent magnet 50 can be smaller and lighter, reducing the weight of the push card 40, reducing the power consumption of the coil, which is conducive to miniaturization and cost reduction. Since the permanent magnet 50 is located inside the electromagnetic relay and in the push card 40, there is no need to set up additional space to place the permanent magnet 50, which is also conducive to miniaturization, and there is no need to change other structures of the electromagnetic relay, making it highly versatile. Since the permanent magnet 50 can move with the push card 40, the permanent magnet 50 does not need to cover the stationary contact 22 and the moving contact 32, which is conducive to reducing size and weight.
[0058] Furthermore, since the permanent magnet 50 is located on the push card 40, it can move with the push card 40. The magnetic field of the permanent magnet 50 can change with its position, meaning the moving magnetic field generated by the permanent magnet 50 can move with the electric arc, ensuring a strong magnetic field intensity acts on the arc, which is beneficial for improving the arc extinguishing effect. Because the position of the magnetic field generated by the permanent magnet 50 can change with its position, the direction of arc pulling will also shift accordingly. This prevents the electric arc from always striking in the same direction, avoiding concentrated ablation.
[0059] In one embodiment, referring to Figure 2, the permanent magnet 50 is positioned directly opposite the stationary contact 22, so that the permanent magnet 50 is directly above the stationary contact 22. This results in a better arc extinguishing effect.
[0060] In other embodiments, the permanent magnet 50 is disposed directly opposite the moving contact 32, such that the permanent magnet 50 is located directly above the moving contact 32. Alternatively, the permanent magnet 50 is disposed directly opposite the stationary contact 22 and the moving contact 32, such that the permanent magnet 50 is located directly above the stationary contact 22 and the moving contact 32.
[0061] In one embodiment, referring to Figures 3 and 5, the second end 42 of the push card 40 is provided with a receiving groove 421, and the permanent magnet 50 is disposed in the receiving groove 421. It should be noted that the shape and size of the receiving groove 421 are adapted to the shape and size of the permanent magnet 50. Specifically, the permanent magnet 50 is a square body, and the receiving groove 421 is a square groove adapted to the size of the permanent magnet 50.
[0062] Furthermore, the second end 42 of the push card 40 is also provided with an anti-detachment structure, which is used to fix the permanent magnet 50 in the receiving groove 421. In this way, under the action of the anti-detachment structure, the permanent magnet 50 can be fixed in the receiving groove 421, preventing the permanent magnet 50 from detaching from the receiving groove 421 and ensuring the arc extinguishing effect.
[0063] In one embodiment, referring to Figures 2 and 5, the anti-detachment structure includes an anti-detachment buckle 422. At least two anti-detachment buckles 422 are provided, and all anti-detachment buckles 422 are located on the side wall of the receiving groove 421. The anti-detachment buckles 422 are engaged with the side of the permanent magnet 50 near the opening of the receiving groove 421.
[0064] Optionally, all the anti-detachment latches 422 are respectively provided on the sidewalls of the receiving groove 421 on both sides along the first direction; or, all the anti-detachment latches 422 are respectively provided on the sidewalls of the receiving groove 421 at both ends along the first direction; or, all the anti-detachment latches 422 are respectively provided on all the sidewalls of the receiving groove 421. In this way, the reliability of the permanent magnet 50 assembly can be improved.
[0065] In this embodiment, referring to Figure 5, there are two anti-detachment buckles 422, which are located on the sidewalls of the receiving groove 421 along the first direction.
[0066] In another embodiment, referring to Figures 8 and 9, the anti-detachment structure includes an anti-detachment buckle 422 and an anti-detachment cover 423. The anti-detachment buckle 422 and the anti-detachment cover 423 are respectively disposed on two opposite sidewalls of the receiving groove 421. There is a gap between the anti-detachment buckle 422 and the anti-detachment cover 423 for the permanent magnet 50 to be inserted. The anti-detachment buckle 422 is fastened to the side of the permanent magnet 50 near the opening of the receiving groove 421, and the anti-detachment cover 423 is disposed on the side of the permanent magnet 50 near the opening of the receiving groove 421.
[0067] It should be noted that the number of anti-detachment clips 422 can be set according to actual needs. Optionally, there may be one, two, or more than three anti-detachment clips 422, without limitation.
[0068] Referring to Figures 9 and 10, during installation, the permanent magnet 50 is installed in the receiving groove 421 using an oblique assembly method. Specifically, the first end of the permanent magnet 50 is positioned outside the receiving groove 421, and the second end of the permanent magnet 50 is inserted obliquely downwards into the receiving groove 421 from its opening, so that the second end of the permanent magnet 50 is located below the anti-detachment cover 423. The first and second ends of the permanent magnet 50 are respectively the two ends of the permanent magnet 50 along the length direction of the receiving groove 421, where the length direction of the receiving groove 421 is perpendicular to the first direction. Then, pressing down on the first end of the permanent magnet 50 causes it to move towards the bottom wall of the receiving groove 421, while the second end moves towards the opening of the receiving groove 421. After the permanent magnet 50 is assembled into the receiving groove 421, the permanent magnet 50 is in contact with the bottom wall of the receiving groove 421. At the same time, the anti-detachment buckle 422 is fastened to the side of the permanent magnet 50 near the opening of the receiving groove 421, and the anti-detachment cover plate 423 is placed on the side of the permanent magnet 50 near the opening of the receiving groove 421. In this way, the anti-detachment buckle 422 and the anti-detachment cover plate 423 cooperate to fix the permanent magnet 50 in the receiving groove 421, preventing the permanent magnet 50 from detaching from the receiving groove 421, ensuring the arc extinguishing effect. At the same time, it can also avoid the risk of fixation failure due to glue aging of the permanent magnet 50, which is fixed by glue, thus improving the reliability of the assembly of the permanent magnet 50. In addition, only the interference fit on one side needs to be controlled to reduce the risk of failure of the anti-detachment buckle 422.
[0069] Optionally, the anti-detachment buckle 422 and the anti-detachment cover 423 are respectively provided on the sidewalls of the receiving groove 421 on both sides along the first direction. Alternatively, the anti-detachment buckle 422 and the anti-detachment cover 423 are respectively provided on the sidewalls of the receiving groove 421 at both ends along the first direction.
[0070] In this embodiment, referring to Figure 11, the anti-detachment buckle 422 and the anti-detachment cover plate 423 are respectively provided on the sidewalls of the receiving groove 421 along the first direction.
[0071] Further, referring to Figures 10 and 11, the bottom of the receiving groove 421 is provided with a through hole 4211, which corresponds to the anti-detachment cover plate 423. It can be understood that the through hole 4211 is located below the anti-detachment cover plate 423. When the permanent magnet 50 is obliquely assembled into the receiving groove 421, the through hole 4211 allows the second end of the permanent magnet 50 to be inserted. Thus, by providing a through hole 4211 at the bottom of the receiving groove 421, on the one hand, demolding is facilitated; on the other hand, during the oblique assembly of the permanent magnet 50 into the receiving groove 421, the second end of the permanent magnet 50 can extend into the through hole 4211, avoiding interference from the anti-detachment cover plate 423 on the permanent magnet 50, reducing the deformation of the anti-detachment buckle 422, thereby helping to reduce the risk of failure of the anti-detachment buckle 422.
[0072] In one embodiment, referring to Figures 7 and 10, the wall of the receiving groove 421 is provided with a receiving groove 4212, and the anti-detachment buckle 422 is provided in the receiving groove 4212.
[0073] Further referring to Figures 7 and 10, the anti-detachment buckle 422 includes a connecting arm 4221 and a fastening part 4222. One end of the connecting arm 4221 is connected to the bottom wall of the receiving groove 4212, and the connecting arm 4221 extends from the bottom wall of the receiving groove 4212 toward the opening of the receiving groove 4212, with a gap between the connecting arm 4221 and the side wall of the receiving groove 4212. The fastening part 4222 is provided at the end of the connecting arm 4221 near the opening of the receiving groove 4212. During installation, the fastening part 4222 engages with the side of the permanent magnet 50 near the opening of the receiving groove 421, thereby fixing the permanent magnet 50 inside the receiving groove 421.
[0074] During the process of assembling the permanent magnet 50 into the receiving groove 421, the anti-detachment buckle 422 will deform. By placing the anti-detachment buckle 422 in the receiving groove 4212 and having a gap between it and the side wall of the receiving groove 4212, the deformation of the anti-detachment buckle 422 will not be interfered with. That is, the receiving groove 4212 provides enough space for the anti-detachment buckle 422 to deform, thus ensuring that the anti-detachment buckle 422 can be fastened to the permanent magnet 50.
[0075] In one embodiment, referring to Figures 1, 2, and 3, the electromagnetic relay further includes an arc-blocking member 60. The arc-blocking member 60 includes a first arc-blocking portion 61 and a second arc-blocking portion 62, opposite to each other. The first arc-blocking portion 61 is located on one side of the stationary contact 22 and the moving contact 32, and the second arc-blocking portion 62 is located on the other side. By providing the first arc-blocking portion 61 and the second arc-blocking portion 62 on both sides of the stationary contact 22 and the moving contact 32 along a first direction, the first arc-blocking portion 61 and the second arc-blocking portion 62 can block the electric arc, preventing the arc from striking the plastic component.
[0076] Optionally, referring to Figure 3, both the first arc-blocking part 61 and the second arc-blocking part 62 are arc-blocking blocks, and the two arc-blocking blocks are independent of each other and arranged opposite to each other.
[0077] Optionally, referring to Figures 1 and 2, the arc-blocking member 60 further includes a connecting portion 63. The connecting portion 63 is located on the side of the stationary spring 21 away from the moving spring 31. One side of the connecting portion 63 is connected to the first arc-blocking portion 61, and the other side of the connecting portion 63 is connected to the second arc-blocking portion 62, so that the arc-blocking member 60 surrounds the stationary contact 22 and the moving contact 32.
[0078] In one embodiment, the arc-blocking member 60 is made of ceramic. Ceramic has good stability, insulation, and high-voltage resistance. Of course, in other embodiments, the arc-blocking member 60 may be made of other materials, and is not limited thereto.
[0079] In another embodiment, referring to Figure 12, the anti-detachment structure includes a fixing member 424. Optionally, the fixing member 424 is an iron sheet. Besides fixing the permanent magnet 50, the iron sheet also serves to concentrate the magnetism, increasing the magnetic field lines returning from the N pole to the S pole of the permanent magnet 50, reducing magnetic loss, and ensuring arc extinguishing effect. Furthermore, two fixing members 424 are provided, and the two fixing members 424 are arranged opposite to each other.
[0080] Further referring to Figures 12 and 14, the fixing member 424 includes a mounting arm 4241 and a cover plate 4242. The mounting arm 4241 is disposed between the permanent magnet 50 and the side wall of the receiving groove 421, and the opposite sides of the mounting arm 4241 are respectively connected to the opposite two side walls of the receiving groove 421. The cover plate 4242 is connected to the mounting arm 4241 and covers the side of the permanent magnet 50 near the opening of the receiving groove 421.
[0081] During installation, the permanent magnet 50 is first placed in the receiving groove 421. Then, the mounting arm 4241 of the fixing member 424 is inserted between the permanent magnet 50 and the side wall of the receiving groove 421, so that the cover plate 4242 covers the side of the permanent magnet 50 near the opening of the receiving groove 421. In this way, the cover plate 4242 acts as a limit to confine the permanent magnet 50 within the receiving groove 421, preventing the permanent magnet 50 from detaching from the receiving groove 421 and improving the reliability of the assembly of the permanent magnet 50.
[0082] Of course, in other embodiments, the permanent magnet 50 can also be directly installed into the receiving groove 421, and the permanent magnet 50 can be bonded to the side wall and bottom wall of the receiving groove 421 by dispensing, injection molding or other methods.
[0083] In one embodiment, referring to FIG14, anti-retraction teeth 4243 are provided on opposite sides of the mounting arm 4241, and the anti-retraction teeth 4243 are interference-fitted with the sidewall of the receiving groove 421. In this way, the reliability of the fastener 424 assembly can be improved.
[0084] In one embodiment, referring to Figures 12 and 13, the bottom wall of the receiving groove 421 is provided with two through holes, which are respectively located on both sides of the bottom wall of the receiving groove 421 along the first direction. Two fixing members 424 are provided, and the mounting arms 4241 of the two fixing members 424 are respectively located in the two through holes. The ends of the mounting arms 4241 of the two fixing members 424, away from the cover plate portion 4242, are respectively located on both sides of the stationary contact 22 and the moving contact 32 along the first direction. Since the mounting arms 4241 extend to both sides of the stationary contact 22 and the moving contact 32 along the first direction, the mounting arms 4241 can block the electric arc, preventing the electric arc from hitting the plastic part.
[0085] In one embodiment, the permanent magnet 50 has a first polarity 51 and a second polarity 52. Optionally, the first polarity 51 is one of the N pole and the S pole, and the second polarity 52 is the other of the N pole and the S pole.
[0086] Referring to Figure 4, the first polarity 51 and the second polarity 52 are located at opposite ends of the permanent magnet 50 along the depth direction of the receiving groove 421. Specifically, the side of the permanent magnet 50 with the first polarity 51 is close to the opening of the receiving groove 421, and the side of the permanent magnet 50 with the second polarity 52 is close to the bottom wall of the receiving groove 421. Taking Figure 4 as an example, if the first polarity 51 is the N pole and the second polarity 52 is the S pole, when the current direction between the stationary contact 22 and the moving contact 32 enters perpendicular to the paper direction, the arc blowing direction is to the left; when the current direction between the stationary contact 22 and the moving contact 32 flows out perpendicular to the paper direction, the arc blowing direction is to the right. The arc blowing direction is represented by T. If the first polarity 51 is the S pole and the second polarity 52 is the N pole, when the current direction between the stationary contact 22 and the moving contact 32 enters perpendicular to the paper direction, the arc blowing direction is to the right; when the current direction between the stationary contact 22 and the moving contact 32 flows out perpendicular to the paper direction, the arc blowing direction is to the left. It should be noted that the stationary spring 21 is connected to the positive terminal, and the moving spring 31 is connected to the negative terminal. If the current enters perpendicular to the paper direction, it is a positive current; if the current flows out perpendicular to the paper direction, it is a reverse current. Thus, regardless of whether the current flows between the stationary contact 22 and the moving contact 32 in either the positive or negative direction, the arc direction is always left-right. This prevents the arc from reaching the push card 40, thus avoiding melting the push card and preventing product failure.
[0087] Of course, in other embodiments, referring to FIG13, the first polarity 51 and the second polarity 52 are respectively located at both ends of the permanent magnet 50 along the length direction of the receiving groove 421, wherein the length direction of the receiving groove 421 is perpendicular to the first direction. It can be understood that the end of the permanent magnet 50 with the first polarity 51 is close to the groove sidewall of the receiving groove 421 on the side along the first direction, and the end of the permanent magnet 50 with the second polarity 52 is close to the groove sidewall of the receiving groove 421 on the other side along the first direction. Taking Figure 13 as an example, if the left end of the permanent magnet 50 is the N pole and the right end is the S pole, when the current direction between the stationary contact 22 and the moving contact 32 enters perpendicular to the paper direction, the arc blowing direction is downward; when the current direction between the stationary contact 22 and the moving contact 32 flows out perpendicular to the paper direction, the arc blowing direction is upward. Similarly, if the left end of the permanent magnet 50 is the S pole and the right end is the N pole, when the current direction between the stationary contact 22 and the moving contact 32 enters perpendicular to the paper direction, the arc blowing direction is upward; when the current direction between the stationary contact 22 and the moving contact 32 flows out perpendicular to the paper direction, the arc blowing direction is downward. Thus, regardless of whether the current flows in the forward or reverse direction between the stationary contact 22 and the moving contact 32, the arc blowing direction is always upward or downward.
[0088] In one embodiment, referring to FIG15, the stationary spring assembly 20 further includes a magnetic conductor 23. The magnetic conductor 23 is disposed on the stationary spring sheet 21. Thus, the magnetic conductor 23 can play a role in focusing the magnetism, increasing the magnetic field lines returning from the N pole to the S pole of the permanent magnet 50, reducing magnetic loss, and ensuring the arc extinguishing effect.
[0089] In one embodiment, referring to Figures 15 and 16, the magnetic conductor 23 includes a main body 231. The main body 231 is fixed to the stationary spring 21. Optionally, referring to Figures 8 and 16, the main body 231 is located on the side of the stationary spring 21 facing the moving spring 31. This improves the arc-extinguishing effect and also provides short-circuit protection.
[0090] Optionally, referring to Figures 1, 15 and 16, the main body 231 is provided with a first connecting hole 2311. The stationary spring 21 is provided with a protrusion 211 on the side facing the moving spring 31, and the protrusion 211 engages with the first connecting hole 2311.
[0091] Optionally, the main body 231 is provided with a first connecting hole 2311, and the stationary spring 21 is provided with a second connecting hole, the first connecting hole 2311 and the second connecting hole communicating with each other. A connector is provided in the first connecting hole 2311 and the second connecting hole, the connector connecting the magnetic conductor 23 to the stationary spring 21. The connector may be a rivet or the like.
[0092] In one embodiment, referring to Figures 15 and 16, the main body 231 is provided with a relief groove 2312. Specifically, the relief groove 2312 is an arc-shaped groove adapted to the stationary contact 22. During installation, the relief groove 2312 can avoid the stationary contact 22, preventing interference between the main body 231 and the stationary contact 22.
[0093] Optionally, referring to Figure 16, two clearance slots 2312 are provided. One clearance slot 2312 is located on the side of the main body 231 near the stationary contact 22, and the other clearance slot 2312 is located on the side of the main body 231 away from the stationary contact 22. During installation, either clearance slot 2312 can be placed close to the stationary contact 22 to prevent errors and also to improve the ease of installation of the magnetic conductor 23.
[0094] In one embodiment, referring to Figures 8 and 16, the main body 231 has opposing first and second sides. The magnetic conductor 23 further includes a first sidewall 232 and a second sidewall 233. The first sidewall 232 is connected to the first side of the main body 231 and extends from the main body 231 in a direction away from the moving spring 31. The second sidewall 233 is connected to the second side of the main body 231 and extends from the main body 231 in a direction away from the moving spring 31. Thus, the first sidewall 232 and the second sidewall 233 can respectively contact the opposing sides of the stationary spring 21, improving the reliability of the installation of the magnetic conductor 23. At the same time, by providing the first sidewall 232 and the second sidewall 233, the magnetic focusing effect can be further improved, the magnetic field lines returning from the N pole to the S pole of the permanent magnet 50 can be further increased, magnetic loss can be reduced, and the arc extinguishing effect can be guaranteed.
[0095] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0096] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0097] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0098] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0099] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.
[0100] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0101] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. An electromagnetic relay, characterized in that, include: armature assembly; A stationary spring assembly, the stationary spring assembly including a stationary spring sheet and a stationary contact disposed on the stationary spring sheet; A movable spring assembly, comprising a movable spring sheet and a movable contact disposed on the movable spring sheet, the movable contact being disposed opposite to the stationary contact; A pusher, connected to the armature assembly and the movable spring, the pusher capable of pushing the movable spring to move, causing the movable contact to contact or disconnect from the stationary contact; and A permanent magnet is disposed on the push card; the permanent magnet corresponds to at least one of the stationary contact and the moving contact; the magnetic field formed by the permanent magnet is used to extinguish the arc.
2. The electromagnetic relay according to claim 1, characterized in that, The permanent magnet is positioned directly opposite at least one of the stationary contact and the moving contact.
3. The electromagnetic relay according to claim 1, characterized in that, The push card has a first end and a second end opposite to each other. The first end is connected to the armature assembly, and the second end is connected to the moving spring. The permanent magnet is disposed at the second end, and the permanent magnet and the moving spring are spaced apart.
4. The electromagnetic relay according to claim 1, characterized in that, The push card is provided with a receiving slot, and the permanent magnet is fixed in the receiving slot.
5. The electromagnetic relay according to claim 4, characterized in that, The push card also includes an anti-detachment structure, which is disposed in the receiving groove and is used to fix the permanent magnet.
6. The electromagnetic relay according to claim 5, characterized in that, The anti-detachment structure includes anti-detachment buckles, and there are at least two anti-detachment buckles. All the anti-detachment buckles are located on the wall of the receiving groove, and all the anti-detachment buckles are fastened to the side of the permanent magnet near the opening of the receiving groove.
7. The electromagnetic relay according to claim 5, characterized in that, The anti-detachment structure includes an anti-detachment buckle and an anti-detachment cover plate. The anti-detachment buckle and the anti-detachment cover plate are respectively disposed on two opposite side walls of the receiving groove. There is a gap between the anti-detachment buckle and the anti-detachment cover plate for the permanent magnet to be inserted. The anti-detachment buckle is fastened to the side of the first end of the permanent magnet near the opening of the receiving groove, and the anti-detachment cover plate is disposed on the side of the second end of the permanent magnet near the opening of the receiving groove.
8. The electromagnetic relay according to claim 7, characterized in that, The bottom wall of the receiving groove is provided with a through hole, which corresponds to the anti-detachment cover. When the permanent magnet is obliquely assembled in the receiving groove, the through hole allows the second end of the permanent magnet to be inserted.
9. The electromagnetic relay according to claim 5, characterized in that, The anti-detachment structure includes a fixing member, which includes a mounting arm and a cover plate. The mounting arm is disposed between the permanent magnet and the side wall of the receiving groove. The opposite sides of the mounting arm are respectively connected to the opposite two side walls of the receiving groove. The cover plate is connected to the mounting arm and covers the side of the permanent magnet near the opening of the receiving groove.
10. The electromagnetic relay according to claim 9, characterized in that, The mounting arm is provided with anti-retraction teeth on both sides, and the anti-retraction teeth are interference-fitted with the side wall of the receiving groove.
11. The electromagnetic relay according to claim 9, characterized in that, The bottom wall of the receiving groove is provided with two through holes, which are respectively located on both sides of the bottom wall of the receiving groove along the arrangement direction of the stationary spring assembly and the moving spring assembly. Two fixing members are provided, and the mounting arms of the two fixing members are respectively provided in the two through holes. The mounting arm of one fixing member is provided on one side of the stationary contact and the moving contact, and the mounting arm of the other fixing member is provided on the other side of the stationary contact and the moving contact.
12. The electromagnetic relay according to any one of claims 4 to 11, characterized in that, The permanent magnet has a first polarity and a second polarity, which are located at opposite ends of the permanent magnet along the depth direction of the receiving groove.
13. The electromagnetic relay according to any one of claims 4 to 11, characterized in that, The permanent magnet has a first polarity and a second polarity, which are located at the two ends of the permanent magnet along the length of the receiving groove, and the length of the receiving groove is perpendicular to the arrangement direction of the static spring assembly and the dynamic spring assembly.
14. The electromagnetic relay according to any one of claims 1 to 11, characterized in that, The stationary spring assembly also includes a magnetic conductor, which is disposed on the stationary spring sheet.
15. The electromagnetic relay according to any one of claims 1 to 11, characterized in that, The electromagnetic relay further includes an arc-blocking component, which includes a first arc-blocking portion and a second arc-blocking portion opposite to each other. The first arc-blocking portion is located on one side of the stationary spring assembly and the moving spring assembly along their respective arrangement directions, and the second arc-blocking portion is located on the other side of the stationary spring assembly and the moving spring assembly along their respective arrangement directions.