Electromagnetic relay

Abstract

The application relates to an electromagnetic relay, which comprises a main contact part and a permanent magnet. A magnetic circuit part comprises an armature. The main contact part comprises a main static spring assembly and a main dynamic spring assembly. The main static spring assembly comprises a main static spring piece and a main static contact point arranged on the main static spring piece. The main dynamic spring assembly comprises a main dynamic spring piece and a main dynamic contact point arranged on the main dynamic spring piece. The main static contact point is arranged opposite to the main dynamic contact point. The permanent magnet is arranged on the side of the main static contact point away from the main dynamic contact point or on the side of the main dynamic contact point away from the main static contact point. The permanent magnet can form a longitudinal magnetic field between the main static contact point and the main dynamic contact point. Through longitudinal arc blowing, the electromagnetic relay can effectively reduce the burning loss of the main static contact and the main dynamic contact by an arc, shorten the arc burning time, and thus improve the electrical endurance and reliability of the electromagnetic relay.

Description

Technical Field

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

[0002] An electromagnetic relay is a type of relay that uses electromagnetic force to drive the relative motion of mechanical parts to produce a predetermined response. It is widely used in home appliances, remote control, telemetry, communication, automatic control, mechatronics and power electronic equipment. In control circuits, it plays a role in automatic adjustment, safety protection and circuit switching.

[0003] When the contacts of an electromagnetic relay separate, an electric arc is generated. After the electromagnetic relay has been operating for a long time, the contacts will be burned by the electric arc, resulting in poor electrical durability of the electromagnetic relay. Utility Model Content

[0004] Therefore, it is necessary to provide an electromagnetic relay that improves the electrical durability and reliability of the electromagnetic relay.

[0005] An electromagnetic relay, comprising:

[0006] The main contact portion includes a main stationary spring assembly and a drive spring assembly. The main stationary spring assembly includes a main stationary spring sheet and a main stationary contact disposed on the main stationary spring sheet. The drive spring assembly includes a drive spring sheet and a drive contact disposed on the drive spring sheet. The main stationary contact and the drive contact are disposed opposite to each other.

[0007] A permanent magnet is disposed on the side of the main stationary contact away from the active contact, or the permanent magnet is disposed on the side of the active contact away from the main stationary contact. The polar side of the permanent magnet faces the main stationary contact and the active contact, and the permanent magnet can form a longitudinal magnetic field between the main stationary contact and the active contact.

[0008] In one embodiment, the permanent magnet is positioned directly opposite the main stationary contact and the active contact.

[0009] In one embodiment, the electromagnetic relay further includes a base, on which the main contact portion and the permanent magnet are disposed.

[0010] In one embodiment, the base is provided with a first partition wall located between the main contact portion and the permanent magnet.

[0011] In one embodiment, the electromagnetic relay further includes a first reaction member disposed on the side of the active spring assembly facing the main stationary spring assembly, the first reaction member being used to push the active spring sheet to move in a direction away from the main stationary spring assembly.

[0012] In one embodiment, the electromagnetic relay further includes a base, the base having a first partition wall; the first reaction member is disposed above the main stationary spring assembly along a first direction, the first reaction member including a connecting portion and a deformation portion connected to the connecting portion, the connecting portion being disposed in the first partition wall, and the deformation portion being inclined from the connecting portion along the first direction toward the direction close to the active spring assembly.

[0013] In one embodiment, the first partition wall is provided with a first slot, the connecting part is disposed in the first slot, the connecting part is provided with a rib, and the rib is in close contact with the slot wall of the first slot.

[0014] In one embodiment, the first partition wall is further provided with a second slot communicating with the first slot, and the connecting part is provided with a limiting protrusion on one side along its insertion direction. The limiting protrusion is located in the second slot and is provided with a backstop hook.

[0015] In one embodiment, the electromagnetic relay further includes a base, a magnetic circuit portion, and a pusher. The magnetic circuit portion and the pusher are disposed on the base. The magnetic circuit portion includes an armature. The pusher is connected to the armature and the active spring. The pusher is used to drive the active spring assembly to move toward or away from the main stationary spring assembly, so that the active contact contacts or separates from the main stationary contact.

[0016] In one embodiment, the magnetic circuit portion further includes a coil frame, an iron core, and a yoke. The coil frame is mounted on the base, and a coil is wound around the outside of the coil frame. The coil frame has a through hole that extends through the coil frame along a second direction, and the iron core is disposed within the through hole. The yoke is disposed outside the coil frame and includes a first segment and a second segment. The first segment and the second segment are connected to form an L-shape. The first segment is disposed on one side of the coil frame in the second direction and is connected to the iron core. The second segment extends along the second direction. An armature is disposed on the side of the coil frame opposite to the first segment and is rotatably connected to the second segment. The armature engages with the pole shoe surface of the iron core.

[0017] In one embodiment, the magnetic circuit portion further includes an elastic reset member connected to the yoke and the armature, the elastic reset member being used to drive the armature to reset.

[0018] In one embodiment, the active spring assembly further includes an active spring lead-out piece, which is disposed on the side of the active spring away from the main stationary spring assembly, and is disposed on the base and rotatably connected to the active spring.

[0019] In one embodiment, the active spring assembly further includes a second reaction member disposed on the side of the active spring away from the main stationary spring assembly. The second reaction member is connected to the push card and the active spring. The second reaction member is capable of elastic deformation when the main stationary contact contacts the active contact and recovers its deformation when the main stationary contact separates from the active contact.

[0020] In one embodiment, the push card is disposed along a second direction; the base is provided with a first partition wall, the first partition wall is provided with a first clearance groove, the first clearance groove passes through the first partition wall along the second direction, and the push card passes through the first clearance groove; the electromagnetic relay further includes a limiting member, the limiting member is disposed in the first partition wall and is disposed corresponding to the opening of the first clearance groove, the limiting member is used to restrict the push card from falling out through the opening of the first clearance groove.

[0021] In one embodiment, the base is provided with a second partition wall, which is located between the main contact portion and the magnetic circuit portion.

[0022] In one embodiment, at least two main contact portions are provided, and all the main contact portions are arranged at intervals along a second direction; at least two permanent magnets are provided, and all the permanent magnets are arranged in a one-to-one correspondence with all the main contact portions.

[0023] The aforementioned electromagnetic relay, because a permanent magnet is located on the side of the main stationary contact away from the driving contact, or vice versa, creates a longitudinal magnetic field between the main stationary contact and the driving contact. Under the influence of this longitudinal magnetic field, the arc is forced to move along the magnetic field lines, causing the arc to be rapidly cooled and the dielectric strength to recover quickly, thus extinguishing the arc. In this way, through longitudinal arc extinguishing, the electromagnetic relay can effectively reduce the burn damage to the main stationary and driving contacts caused by the arc, shorten the arc burning time and arc energy, thereby improving the electrical durability and reliability of the electromagnetic relay. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an electromagnetic relay according to an embodiment of this application.

[0025] Figure 2 for Figure 1 The right view of the electromagnetic relay shown.

[0026] Figure 3 for Figure 1 The top view of the electromagnetic relay shown.

[0027] Figure 4 This is a schematic diagram of the structure of the second reaction member according to an embodiment of this application.

[0028] Figure 5 The voltage and current waveforms of an electromagnetic relay according to an embodiment of this application under a standard load of 277V and 80A are shown below. Figure 1 .

[0029] Figure 6 for Figure 5 A magnified view of a portion of point A in the middle.

[0030] Figure 7 The voltage and current waveforms of an electromagnetic relay according to an embodiment of this application under a standard load of 277V and 80A are shown below. Figure 2 .

[0031] Figure 8 for Figure 7 A magnified view of a portion of point B in the middle.

[0032] Explanation of icon numbers:

[0033] 20. Main contact part; 21. Main stationary spring assembly; 211. Main stationary spring leaf; 212. Main stationary contact; 22. Active spring assembly; 221. Active spring leaf; 222. Active contact; 223. Active spring lead-out leaf; 224. Rotating shaft; 225. Second reaction force component; 23. First reaction force component; 231. Connecting part; 2311. Protruding rib; 232. Deformation part; 233. Limiting protrusion; 2331. Anti-reverse hook; 30. Pushing clip; 31. Insulating connector; 311. Slot; 40. Permanent magnet; 5 0. Base; 51. Base body; 511. Top wall; 512. Bottom wall; 513. Left side wall; 514. Right side wall; 515. Mounting slot; 52. First partition wall; 53. Second partition wall; 54. Receiving cavity; 60. Magnetic circuit part; 61. Armature; 62. Coil frame; 621. Coil; 63. Iron core; 64. Yoke; 641. First section; 642. Second section; 65. Elastic reset component; 70. Auxiliary contact part; 71. Auxiliary stationary spring assembly; 72. Auxiliary moving spring assembly; 80. Limiting component. Detailed Implementation

[0034] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are 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 modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0035] See Figure 1 An embodiment of this application provides an electromagnetic relay including a main contact portion 20, a push card 30, and a magnetic circuit portion 60.

[0036] See Figure 1 The main contact portion 20 includes a main stationary spring assembly 21 and a drive spring assembly 22. The main stationary spring assembly 21 includes a main stationary spring plate 211 and a main stationary contact 212, with the main stationary contact 212 disposed on the main stationary spring plate 211. The drive spring assembly 22 includes a drive spring plate 221 and a drive contact 222, with the drive contact 222 disposed on the drive spring plate 221 and disposed opposite to the main stationary contact 212.

[0037] See Figure 3 The magnetic circuit section 60 includes an armature 61.

[0038] See Figure 1 The pusher 30 connects to the armature 61 and the active spring 221. Under the action of the magnetic circuit 60, the pusher 30 can drive the active spring assembly 22 to move closer to or away from the main stationary spring assembly 21, so that the active contact 222 contacts or separates from the main stationary contact 212.

[0039] When the electromagnetic relay is working, the magnetic circuit part 60 generates a magnetic field, which causes the armature 61 to rotate, thereby driving the push card 30 to move. The push card 30 drives the active spring assembly 22 to move towards or away from the main stationary spring assembly 21, so that the active contact 222 contacts or separates from the main stationary contact 212, thereby achieving the purpose of connecting or disconnecting the circuit.

[0040] However, when the active contact 222 separates from the main stationary contact 212, an electric arc will be generated between the active contact 222 and the main stationary contact 212.

[0041] To reduce the impact of electric arc on the electromagnetic relay, in this embodiment, refer to... Figure 1 The electromagnetic relay also includes a permanent magnet 40. The permanent magnet 40 is located on the side of the main stationary contact 212 opposite to the active contact 222, or on the side of the active contact 222 opposite to the main stationary contact 212. The polarized side of the permanent magnet 40 faces both the main stationary contact 212 and the active contact 222, and the permanent magnet 40 can form a longitudinal magnetic field for arc extinguishing between the main stationary contact 212 and the active contact 222.

[0042] It should be noted that the direction of the longitudinal magnetic field is parallel to the axis of the electric arc.

[0043] Because a permanent magnet 40 is provided on the side of the main stationary contact 212 away from the active contact 222, or a permanent magnet 40 is provided on the side of the active contact 222 away from the main stationary contact 212, a longitudinal magnetic field is formed between the main stationary contact 212 and the active contact 222. Under the action of the longitudinal magnetic field, the arc is forced to move along the direction of the magnetic field lines, causing the arc to be rapidly cooled and the dielectric strength to recover rapidly, thereby achieving the purpose of extinguishing the arc. (See also...) Figures 5 to 8 , Figure 5The voltage and current waveforms of an electromagnetic relay according to an embodiment of this application under a standard load of 277V and 80A are shown below. Figure 1 , Figure 6 for Figure 5 A magnified view of a portion of point A (at time 551ms). Figure 7 The voltage and current waveforms of an electromagnetic relay according to an embodiment of this application under a standard load of 277V and 80A are shown below. Figure 2 , Figure 8 for Figure 7 A magnified view of a portion of point B (at time 382ms). Figure 6 and Figure 8 In the diagram, 'a' represents the contact current waveform of the electromagnetic relay in this embodiment when the contacts are open, 'b' represents the coil voltage waveform of the electromagnetic relay in this embodiment when the contacts are open, and 'c' represents the contact voltage waveform of the electromagnetic relay in this embodiment when the contacts are open. Figure 6 It can be seen that under the longitudinal arcing of the permanent magnet, the peak current decreases by 29A, and the effective value of the disconnecting current decreases from 80A to 59.5A. From Figure 8 It can be seen that under longitudinal arc blowing of the permanent magnet, the peak current decreases by 22A, the effective value of the disconnecting current decreases from 80A to 64.5A, and the half-wave time decreases from 10ms to 8.2ms. Thus, by longitudinal arc blowing, the peak current and the time of current waveform change can be reduced, thereby shortening the arc burning time and arc energy, and improving the electrical durability and reliability of the electromagnetic relay. In one embodiment, see... Figure 1 The permanent magnet 40 is positioned directly opposite the main stationary contact 212 and the active contact 222. It can be understood that the permanent magnet 40 is located on the line connecting the main stationary contact 212 and the active contact 222. This further improves the heat dissipation speed of the electric arc and the recovery speed of the dielectric strength, thereby further enhancing the electrical durability and reliability of the electromagnetic relay.

[0044] In one embodiment, see Figure 1 The electromagnetic relay also includes a base 50. The main contact portion 20, the push card 30, the permanent magnet 40, and the magnetic circuit portion 60 are all located on the base 50. Thus, the base 50 provides mounting positions for the main contact portion 20, the push card 30, the permanent magnet 40, and the magnetic circuit portion 60, facilitating their installation.

[0045] Optionally, the base 50 is made of plastic. Of course, in other embodiments, the base 50 may also be made of ceramic or other materials, and is not limited thereto.

[0046] In one embodiment, the base 50 is provided with a mounting groove 515, and the permanent magnet 40 is disposed within the mounting groove 515. This facilitates the assembly of the permanent magnet 40 and also improves the stability of the permanent magnet 40.

[0047] Of course, in other embodiments, the permanent magnet 40 can also be mounted on the base 50 by bonding or riveting.

[0048] In one embodiment, see Figure 1 The base 50 includes a base body 51. Specifically, the base body 51 includes a top wall 511, a bottom wall 512, a left side wall 513, and a right side wall 514. The top wall 511 and the bottom wall 512 are spaced apart in a first direction of the base 50, and the left side wall 513 and the right side wall 514 are spaced apart in a second direction of the base 50. The first direction and the second direction are perpendicular, X represents the first direction, and Y represents the second direction.

[0049] Further, see Figure 1 The main contact portion 20 and the permanent magnet 40 are both disposed within the space formed by the top wall 511, the bottom wall 512, the left side wall 513, and the right side wall 514. Specifically, the main stationary spring assembly 21 and the active spring assembly 22 are arranged along the second direction.

[0050] In one embodiment, see Figure 1 The base 50 also includes a first partition wall 52. The first partition wall 52 is located between the main contact portion 20 and the permanent magnet 40. Optionally, the two ends of the first partition wall 52 along the first direction are connected to the top wall 511 and the bottom wall 512, respectively. By setting the first partition wall 52 between the main contact portion 20 and the permanent magnet 40, the arc generated by the separation of the main stationary contact 212 and the active contact 222 can be blocked, preventing the permanent magnet 40 from demagnetizing under the action of the high-temperature arc, thereby ensuring the arc extinguishing effect.

[0051] In this embodiment, see Figure 1 The permanent magnet 40 is located on the side of the main stationary contact 212 away from the active contact 222, and a first partition wall 52 is provided between the main stationary spring assembly 21 and the permanent magnet 40.

[0052] In one embodiment, see Figure 1 and Figure 3 The magnetic circuit section 60 also includes a coil frame 62 and an iron core 63. The coil frame 62 is mounted on the base 50, and a coil 621 is wound around the coil frame 62. The coil frame 62 has a through hole that extends through the coil frame 62 along a second direction, and the iron core 63 is disposed in the through hole.

[0053] Further, see Figure 3The magnetic circuit section 60 also includes a yoke 64, which is disposed outside the coil frame 62. Specifically, the yoke 64 includes a first section 641 and a second section 642, which are connected to form an L-shape. The first section 641 is disposed on one side of the coil frame 62 in the second direction and is connected to the iron core 63. The second section 642 extends along the second direction, and an armature 61 is disposed on the side of the coil frame 62 opposite to the first section 641 and is rotatably connected to the second section 642. The armature 61 mates with the pole shoe surface of the iron core 63. Specifically, the end of the second section 642 opposite to the first section 641 has a knife edge, and the armature 61 is rotatably disposed at the knife edge.

[0054] When the coil 621 is energized, it generates a magnetic field. The armature 61 is attracted by the iron core 63 and rotates. The armature 61 drives the push card 30 to move in the second direction, which in turn drives the active spring 221 to move towards the main stationary spring assembly 21, so that the main stationary contact 212 contacts the active contact 222, thereby achieving the purpose of conducting the circuit.

[0055] When the coil 621 is de-energized, the magnetic field of the magnetic circuit part 60 disappears, the armature 61 rotates in the opposite direction, and the armature 61 drives the push card 30 to move in the opposite direction to the second direction, which in turn drives the active spring 221 to move away from the main stationary spring assembly 21, so that the main stationary contact 212 and the active contact 222 are separated, thereby achieving the purpose of cutting off the circuit.

[0056] In one embodiment, see Figure 2 The magnetic circuit section 60 also includes an elastic reset member 65. The elastic reset member 65 is connected to the yoke 64 and the armature 61, and is used to reset the armature 61. When the coil 621 is de-energized, the magnetic field of the magnetic circuit section 60 disappears, and the armature 61 rotates in the opposite direction under the action of the elastic reset member 65. The armature 61 drives the push card 30 to move in the opposite direction to the second direction, which in turn drives the active spring 221 to move away from the main stationary spring assembly 21, so that the main stationary contact 212 separates from the active contact 222, thereby achieving the purpose of cutting off the circuit.

[0057] In one embodiment, see Figure 1 and Figure 3 The base 50 also includes a second partition wall 53. The second partition wall 53 is located on the side of the base body 51 near the coil holder 62. Specifically, the second partition wall 53 is located between the main contact portion 20 and the magnetic circuit portion 60. In this way, the second partition wall 53 can isolate the main contact portion 20 from the magnetic circuit portion 60, thereby increasing the air gap and creepage distance between the main contact portion 20 and the magnetic circuit portion 60, and thus improving the safety of the electromagnetic relay.

[0058] In one embodiment, see Figure 1 and Figure 3The push card 30 extends along the second direction. An insulating connector 31 is provided at the end of the push card 30 near the armature 61, and the insulating connector 31 has a slot 311. The side of the armature 61 near the push card 30 is located within the slot 311. This allows for the connection between the push card 30 and the armature 61.

[0059] Furthermore, the first partition wall 52 has a first clearance groove on the side opposite to the second partition wall 53. The first clearance groove penetrates the first partition wall 52 along the second direction, and the push card 30 passes through the first clearance groove. With this configuration, the first partition wall 52 can avoid the push card 30, preventing the push card 30 from interfering with the first partition wall 52 during assembly. At the same time, the two opposite groove walls of the first clearance groove in the first direction can limit the push card 30, preventing the push card 30 from moving in the first direction.

[0060] In one embodiment, the first clearance groove penetrates one side of the first partition wall 52 away from the second partition wall 53, so that a slot is formed on the side of the first partition wall 52 away from the second partition wall 53. During assembly, the push card 30 is placed in the first clearance groove through the slot, which improves the ease of assembly of the push card 30.

[0061] Further, see Figure 1 The first partition wall 52 is provided with a limiting member 80. Optionally, the limiting member 80 is a retaining spring. The limiting member 80 is set corresponding to the slot of the first clearance groove, and the limiting member 80 is used to prevent the push card 30 from falling out of the slot of the first clearance groove. In this way, the reliability of the installation of the push card 30 can be improved.

[0062] In one embodiment, the active spring 221 has a second clearance groove on the side facing away from the second partition wall 53, through which the push card 30 passes. This configuration allows the active spring 221 to avoid interference between the push card 30 and the active spring 221 during assembly. Simultaneously, the two opposing groove walls of the second clearance groove in the first direction can limit the movement of the push card 30 in the first direction.

[0063] In one embodiment, see Figure 1 The main contact portion 20 also includes a first reaction member 23. Optionally, the first reaction member 23 is a reaction spring. The first reaction member 23 is located on the side of the active spring assembly 22 facing the main stationary spring assembly 21, and the first reaction member 23 is used to push the active spring 221 to move away from the main stationary spring assembly 21.

[0064] It should be noted that the contact separation force of the electromagnetic relay is achieved by the elastic reset member 65 and the first reaction member 23.

[0065] When coil 621 is energized, it generates a magnetic field. Armature 61 is attracted by iron core 63 and rotates. Armature 61 drives pusher 30 to move in the second direction. Pusher 30 drives active spring 221 to move closer to main stationary spring assembly 21. After active spring 221 has moved a certain distance, it comes into contact with first reaction member 23. As active spring 221 continues to move closer to main stationary spring assembly 21, it gradually compresses first reaction member 23, causing it to deform.

[0066] When the coil 621 is de-energized, the magnetic field of the magnetic circuit part 60 disappears. The armature 61 rotates in the opposite direction under the combined action of the elastic reset member 65 and the first reaction member 23. The armature 61 drives the pusher 30 to move in the opposite direction to the second direction, which in turn drives the active spring 221 to move away from the main stationary spring assembly 21. At the same time, the first reaction member 23 gradually recovers its deformation, causing the active spring 221 to move away from the main stationary spring assembly 21.

[0067] In one embodiment, see Figure 1 and Figure 4 The first reaction member 23 includes a connecting part 231 and a deformation part 232 connected to the connecting part 231. The connecting part 231 is located in the first partition wall 52. The deformation part 232 is located between the main stationary spring assembly 21 and the active spring assembly 22, and the deformation part 232 is inclined from the connecting part 231 toward the active contact 222.

[0068] Optionally, see Figure 1 The first reaction member 23 is located above the main stationary contact 212 along the first direction. The connecting part 231 and the deformation part 232 are connected to form an inverted U-shaped structure, and the opening of the inverted U-shaped structure faces the main stationary contact 212.

[0069] In one embodiment, the first partition wall 52 is provided with a first slot, and the connecting part 231 is disposed in the first slot and interference-fitted with the first slot. This arrangement facilitates the installation of the first reaction member 23 and improves the stability of the installation of the first reaction member 23.

[0070] Further, see Figure 4 The connecting part 231 is provided with a protruding rib 2311, which is used to contact and cooperate with the groove wall of the first slot. After the connecting part 231 is provided in the first slot, the protruding rib 2311 is tightly fitted with the groove wall of the first slot, which can improve the reliability of the installation of the first reaction member 23.

[0071] It should be noted that the number and placement of the protruding ribs 2311 can be set according to actual needs. Optionally, refer to... Figure 4 Two ribs 2311 are provided. Both ribs 2311 are provided on the side of the connecting part 231 away from the deformed part 232, and are spaced apart along the first direction.

[0072] In one embodiment, the first slot has a second slot on its wall, the second slot being opposite to and communicating with the opening of the first slot. The connecting portion 231 has a limiting protrusion 233 on one side along its insertion direction, the limiting protrusion 233 being located within the second slot. During assembly, the connecting portion 231 is located within the first slot, while the limiting protrusion 233 is located within the second slot, thus securely installing the first reaction member 23 onto the first partition wall 52.

[0073] Further, see Figure 4 The limiting protrusion 233 is provided with a backstop hook 2331, which engages with the groove wall of the second slot. This further improves the stability of the first reaction member 23 during installation.

[0074] Optionally, see Figure 1 and Figure 4 The limiting protrusion 233 is provided with anti-reverse hooks 2331 on both end faces along the first direction.

[0075] Of course, in other embodiments, a backstop hook 2331 may also be provided on one end face of the limiting protrusion 233 along the first direction. Alternatively, a backstop hook 2331 may be provided on the end face of the limiting protrusion 233 along the second direction.

[0076] In one embodiment, see Figure 1 The active spring assembly 22 also includes an active spring lead-out piece 223. The active spring lead-out piece 223 is located on the side of the active spring piece 221 away from the main stationary spring assembly 21. The active spring lead-out piece 223 is located on the base 50 and is rotatably connected to the active spring piece 221.

[0077] Specifically, see Figure 1 The bottom wall 512 is provided with an insertion hole. One end of the active spring lead-out piece 223 is disposed outside the base 50 through the insertion hole, and the other end of the active spring lead-out piece 223 is rotatably connected to the active spring piece 221 through the rotating shaft 224. The active contact 222 is disposed at the end of the active spring piece 221 opposite to the rotating shaft 224. The push card 30 is connected to the middle of the active spring piece 221 along the first direction.

[0078] In one embodiment, the active spring lead-out piece 223 has a third clearance groove on the side opposite to the second partition wall 53, through which the push card 30 passes. In this way, the active spring lead-out piece 223 can avoid interference between the push card 30 and the active spring lead-out piece 223 during assembly. Simultaneously, the two opposing groove walls of the third clearance groove in the first direction can limit the movement of the push card 30 in the first direction.

[0079] In one embodiment, the active spring 221 is a rigid structure. It is understood that the active spring 221 is only responsible for conducting current and does not perform deformation to achieve the overtravel function.

[0080] Further, see Figure 1 The active spring assembly 22 also includes a second reaction member 225. The second reaction member 225 is located on the side of the active spring 221 opposite to the main stationary spring assembly 21, and is connected to the push card 30 and the active spring 221. The second reaction member 225 is capable of elastic deformation when the main stationary contact 212 contacts the active contact 222, and recovers its deformation when the main stationary contact 212 separates from the active contact 222.

[0081] Optionally, the second reaction element 225 is a reaction spring, with the upper end of the reaction spring connected to the push card 30 and the lower end of the reaction spring connected to the active spring 221.

[0082] In one embodiment, see Figure 1 The main contact portion 20 is provided with at least two, and all the main contact portions 20 are arranged at intervals along the second direction.

[0083] Further, see Figure 1 At least two permanent magnets 40 are provided, and all permanent magnets 40 are arranged in a one-to-one correspondence with all main contact portions 20. Optionally, each main stationary contact 212 is provided with a permanent magnet 40 on the side away from the active contact 222, or each active contact 222 is provided with a permanent magnet 40 on the side away from the main stationary contact 212.

[0084] In this embodiment, there are two main contact portions 20, which are spaced apart along the second direction. There are two permanent magnets 40, with one permanent magnet 40 on the side of each main stationary contact 212 away from the active contact 222.

[0085] In one embodiment, see Figure 1 The electromagnetic relay also includes an auxiliary contact portion 70. The auxiliary contact portion 70 includes an auxiliary stationary spring assembly 71 and an auxiliary moving spring assembly 72. The auxiliary stationary spring assembly 71 includes an auxiliary stationary spring plate and an auxiliary stationary contact, with the auxiliary stationary contact located on the auxiliary stationary spring plate. The auxiliary moving spring assembly 72 includes an auxiliary moving spring plate and an auxiliary moving contact, with the auxiliary moving contact located on the auxiliary moving spring plate. Both the auxiliary stationary spring plate and the auxiliary moving spring plate are located on the base 50, and the auxiliary stationary contact and the auxiliary moving contact are arranged opposite to each other.

[0086] Specifically, see Figure 1 The auxiliary stationary spring assembly 71 and the auxiliary moving spring assembly 72 are located below the armature 61 along the first direction.

[0087] Further, see Figure 1The pusher 30 is connected to the auxiliary moving spring, and the pusher 30 is used to push the auxiliary moving spring assembly 72 in a direction away from the auxiliary stationary spring assembly 71, so as to separate the auxiliary moving contact from the auxiliary stationary contact. The pusher 30 is reset under the combined action of the elastic reset member 65 and the first reaction member 23, and the auxiliary moving contact contacts the auxiliary stationary contact under the reaction force of the auxiliary moving spring itself.

[0088] It should be noted that the operating state of the auxiliary moving spring assembly 72 is opposite to that of the active spring assembly 22. Specifically, when the active spring assembly 22 moves toward the main stationary spring assembly 21, the auxiliary moving spring assembly 72 moves away from the auxiliary stationary spring assembly 71; when the active spring assembly 22 moves away from the main stationary spring assembly 21, the auxiliary moving spring assembly 72 moves toward the auxiliary stationary spring assembly 71.

[0089] In one embodiment, see Figure 1 The main contact portion 20 and the permanent magnet 40 are arranged alternately in the second direction.

[0090] Further, see Figure 1 The permanent magnet 40 is capable of longitudinally blowing an arc on one of its adjacent main contact portions 20, and there is at least one receiving cavity 54 between the permanent magnet 40 and the other adjacent main contact portion 20. In this way, it can be ensured that the permanent magnet 40 forms a longitudinal magnetic field between the main stationary contact 212 and the active contact 222, thereby realizing longitudinal arc blowing.

[0091] Further, see Figure 1 At least one receiving cavity 54 is spaced between the auxiliary contact portion 70 and the adjacent permanent magnet 40. This prevents the magnetic field generated by the permanent magnet 40 from affecting the electric arc generated during the separation of the auxiliary stationary contact and the auxiliary moving contact.

[0092] In this embodiment, when the coil 621 is energized, the magnetic circuit 60 generates a magnetic field. The armature 61 rotates due to the attraction of the iron core 63, which in turn drives the pusher 30 to move in the second direction. The pusher 30 drives the active spring 221 and the second reaction member 225 to move towards the main stationary spring assembly 21. After the active spring 221 has traveled a certain distance, it contacts the deformation part 232. As the active spring 221 continues to move towards the main stationary spring assembly 21, it gradually compresses the deformation part 232, causing it to elastically deform. When the active contact 222 contacts the main stationary contact 212, the second reaction member 225 gradually elastically deforms as the pusher 30 continues to move in the second direction. When the armature 61 is in complete contact with the pole shoe surface of the iron core 63, the second reaction member 225 stops elastically deforming.

[0093] It should be noted that the overtravel of the active contact 222 and the main stationary contact 212 is achieved by the difference in elastic deformation between the first reaction member 23 and the second reaction member 225.

[0094] When the coil 621 is de-energized, the magnetic field of the magnetic circuit section 60 disappears. Under the combined action of the elastic reset member 65 and the first reaction member 23, the armature 61 rotates in the opposite direction, thereby driving the pusher 30 to move in the opposite direction to the second direction. The pusher 30 drives the active spring 221 to move away from the main stationary spring assembly 21. At the same time, the deformed part 232 gradually returns to its shape.

[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: The main contact portion includes a main stationary spring assembly and a drive spring assembly. The main stationary spring assembly includes a main stationary spring sheet and a main stationary contact disposed on the main stationary spring sheet. The drive spring assembly includes a drive spring sheet and a drive contact disposed on the drive spring sheet. The main stationary contact and the drive contact are disposed opposite to each other. A permanent magnet is disposed on the side of the main stationary contact away from the active contact, or the permanent magnet is disposed on the side of the active contact away from the main stationary contact. The polar side of the permanent magnet faces the main stationary contact and the active contact, and the permanent magnet can form a longitudinal magnetic field between the main stationary contact and the active contact.

2. The electromagnetic relay according to claim 1, characterized in that, The permanent magnet is positioned directly opposite the main stationary contact and the active contact.

3. The electromagnetic relay according to claim 1, characterized in that, The electromagnetic relay also includes a base, and the main contact portion and the permanent magnet are both disposed on the base.

4. The electromagnetic relay according to claim 3, characterized in that, The base is provided with a first partition wall, which is located between the main contact portion and the permanent magnet.

5. The electromagnetic relay according to claim 1, characterized in that, The electromagnetic relay further includes a first reaction element, which is located on the side of the active spring assembly facing the main stationary spring assembly. The first reaction element is used to push the active spring to move away from the main stationary spring assembly.

6. The electromagnetic relay according to claim 5, characterized in that, The electromagnetic relay also includes a base, the base having a first partition wall; the first reaction member is located above the main stationary spring assembly along a first direction, the first reaction member includes a connecting part and a deformation part connected to the connecting part, the connecting part is located in the first partition wall, and the deformation part is inclined from the connecting part along the first direction toward the direction closer to the active spring assembly.

7. The electromagnetic relay according to claim 6, characterized in that, The first partition wall is provided with a first slot, the connecting part is provided in the first slot, the connecting part is provided with a rib, and the rib is in close contact with the slot wall of the first slot.

8. The electromagnetic relay according to claim 7, characterized in that, The first partition wall is also provided with a second slot communicating with the first slot. The connecting part is provided with a limiting protrusion on one side along its insertion direction. The limiting protrusion is located in the second slot and is provided with a backstop hook.

9. The electromagnetic relay according to any one of claims 1 to 8, characterized in that, The electromagnetic relay also includes a base, a magnetic circuit portion, and a pusher. The magnetic circuit portion and the pusher are disposed on the base. The magnetic circuit portion includes an armature. The pusher is connected to the armature and the active spring. The pusher is used to drive the active spring assembly to move toward or away from the main stationary spring assembly, so that the active contact contacts or separates from the main stationary contact.

10. The electromagnetic relay according to claim 9, characterized in that, The magnetic circuit section also includes a coil frame, an iron core, and a yoke. The coil frame is mounted on the base, and a coil is wound around the outside of the coil frame. The coil frame has a through hole that penetrates the coil frame along a second direction, and the iron core is disposed inside the through hole. The yoke is disposed outside the coil frame. The yoke includes a first section and a second section. The first section and the second section are connected to form an L-shape. The first section is disposed on one side of the coil frame in the second direction and is connected to the iron core. The second section extends along the second direction. The armature is disposed on the side of the coil frame away from the first section and is rotatably connected to the second section. The armature is engaged with the pole shoe surface of the iron core.

11. The electromagnetic relay according to claim 10, characterized in that, The magnetic circuit section also includes an elastic reset member, which is connected to the yoke and the armature, and is used to drive the armature to reset.

12. The electromagnetic relay according to claim 9, characterized in that, The active spring assembly also includes an active spring lead-out piece, which is located on the side of the active spring sheet opposite to the main stationary spring assembly. The active spring lead-out piece is located on the base and is rotatably connected to the active spring sheet.

13. The electromagnetic relay according to claim 12, characterized in that, The active spring assembly further includes a second reaction member, which is located on the side of the active spring away from the main stationary spring assembly. The second reaction member is connected to the push card and the active spring. The second reaction member can undergo elastic deformation when the main stationary contact contacts the active contact and recover its deformation when the main stationary contact separates from the active contact.

14. The electromagnetic relay according to claim 9, characterized in that, The push card is positioned along the second direction; The base is provided with a first partition wall, the first partition wall is provided with a first clearance groove, the first clearance groove passes through the first partition wall along the second direction, and the push card passes through the first clearance groove; the electromagnetic relay also includes a limiting member, the limiting member is provided on the first partition wall and is set corresponding to the slot of the first clearance groove, the limiting member is used to restrict the push card from falling off through the slot of the first clearance groove.

15. The electromagnetic relay according to claim 9, characterized in that, The base is provided with a second partition wall, which is located between the main contact portion and the magnetic circuit portion.

16. The electromagnetic relay according to any one of claims 1 to 8, characterized in that, The main contact portion is provided in at least two, and all the main contact portions are arranged at intervals along the second direction; The permanent magnet is provided in at least two forms, and all the permanent magnets are arranged in a one-to-one correspondence with all the main contact portions.

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