Electromagnetic relay

Abstract

The invention discloses an electromagnetic relay, and relates to the technical field of relays, the electromagnetic relay comprises a shell, a pushing member and a moving terminal group, the pushing member is slidably mounted on the shell, the moving terminal group comprises two moving terminals, and the two moving terminals are mounted on the pushing member and are arranged at intervals along the sliding direction of the pushing member; the parts, extending out of the pushing part, of the moving terminals are the outward extending parts, the pushing part is provided with the insulating part, and the insulating part is located between the outward extending parts of the two moving terminals, so that the insulating distance between the moving terminals can be increased, and the insulating performance can be improved.

Description

Technical Field

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

[0002] An electromagnetic relay is an electrical control component whose main function is to control a large current or voltage at the output terminal by using a small current at the input terminal, thereby achieving functions such as automatic control, signal conversion, and circuit protection. In current electromagnetic relays, a conductive sheet is typically used as a spring (also known as a moving terminal).

[0003] In related technologies, the creepage distance or electrical clearance between two adjacent moving terminals in an electromagnetic relay is small, resulting in poor insulation performance of the relay, which in turn leads to a decrease in its safety and reliability. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes an electromagnetic relay that can improve insulation performance.

[0005] An electromagnetic relay according to an embodiment of the present invention includes: case; The pusher is slidably mounted on the housing; A movable terminal assembly includes two movable terminals, which are mounted on the pusher and arranged at intervals along the sliding direction of the pusher. The portion of the movable terminal extending outside the pusher is an extension. The pusher is provided with an insulating part, which is located between the extended parts of the two moving terminals.

[0006] The electromagnetic relay according to embodiments of the present invention has at least the following beneficial effects: by providing an insulating portion between two adjacent moving terminals, the insulating portion can increase the creepage distance and electrical clearance between the two moving terminals, thereby providing insulation performance, a larger insulation distance, and higher safety and reliability. At the same time, the overall volume of the insulating portion is small, which is beneficial for meeting the requirement of product miniaturization.

[0007] According to some embodiments of the present invention, the projection of the insulating portion on a plane perpendicular to the sliding direction of the pusher completely covers the projection of the protrusion on a plane perpendicular to the sliding direction of the pusher.

[0008] According to some embodiments of the present invention, along the length direction of the moving terminal, the side of the insulating portion protrudes beyond the side of the moving terminal.

[0009] According to some embodiments of the present invention, along the height direction of the moving terminal, the side of the insulating portion protrudes beyond the side of the moving terminal.

[0010] According to some embodiments of the present invention, the pusher includes a mounting base and a cover plate. The mounting base is provided with at least two mounting grooves arranged at intervals along the sliding direction of the pusher. The two moving terminals are respectively mounted in the mounting grooves. The cover plate is connected to the mounting base by a snap-fit ​​to fix the moving terminals.

[0011] According to some embodiments of the present invention, the insulating portion is formed on the mounting base, the mounting base is provided with a slot located between the two moving terminals, and the cover plate is provided with a boss that is inserted into the slot.

[0012] According to some embodiments of the present invention, the boss extends about an axis parallel to the length direction of the cover plate.

[0013] According to some embodiments of the present invention, the moving terminal includes a terminal body and a spring piece, wherein the spring piece is provided with a hook on one side along its thickness direction, and the spring piece is engaged with the terminal body by the hook.

[0014] According to some embodiments of the present invention, the two ends of the spring sheet along its length direction respectively abut against the two ends of the terminal body, and the middle part of the spring sheet is bent and has a gap with the middle part of the terminal body.

[0015] According to some embodiments of the present invention, the electromagnetic relay further includes a stationary terminal group and a drive mechanism; The stationary terminal group includes two stationary terminals, which are installed on the housing and symmetrically distributed on both sides of the pusher along the sliding direction of the pusher. There are at least two stationary terminal groups, and at least two stationary terminal groups are spaced apart along the length direction of the pusher. The drive mechanism is mounted on the housing and is capable of driving the pusher to move so that the moving terminal group separates from one of the adjacent stationary terminal groups and abuts against the other adjacent stationary terminal group; The moving terminal group is provided with at least one, and each moving terminal group is located in the interval between two adjacent stationary terminal groups and can only abut with one of the stationary terminal groups.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the structure of an electromagnetic relay according to some embodiments of the present invention; Figure 2This is a cross-sectional view of an electromagnetic relay according to some embodiments of the present invention; Figure 3 This is a cross-sectional view of an electromagnetic relay according to some embodiments of the present invention; Figure 4 This is an exploded view of an electromagnetic relay according to some embodiments of the present invention; Figure 5 This is a schematic diagram of the structure of the drive element and moving terminal group of the electromagnetic relay in some embodiments of the present invention; Figure 6 This is a side view of the pusher and moving terminal group of an electromagnetic relay according to some embodiments of the present invention; Figure 7 This is a top view of the pusher and moving terminal group of an electromagnetic relay according to some embodiments of the present invention; Figure 8 for Figure 7 Enlarged view of point A in the middle; Figure 9 This is a front view of the pusher and moving terminal group of an electromagnetic relay according to some embodiments of the present invention; Figure 10 for Figure 9 Enlarged view of point B in the middle; Figure 11 This is a cross-sectional view of the pusher and moving terminal group of an electromagnetic relay according to some embodiments of the present invention; Figure 12 for Figure 11 Enlarged view of point C in the middle; Figure 13 This is an exploded view of the actuator and moving terminal group of an electromagnetic relay according to some embodiments of the present invention; Figure 14 This is a schematic diagram of the moving terminal of an electromagnetic relay according to some embodiments of the present invention.

[0018] Figure label: Electromagnetic relay 1000; Casing 100; Pusher 200; Insulating part 210; Slot 211; Mounting base 220; Mounting groove 221; Recess 222; Cover plate 230; Boss 231; Moving terminal assembly 300; Moving terminal 310; Extension 311; Terminal body 320; Spring 330; Hook 331; Bending part 332; Moving contact 340; Stationary terminal assembly 400; stationary terminal 410; stationary contact 411; Drive mechanism 500; Rotating assembly 510; Mounting component 511; Protrusion 5111; Magnet 512; First iron plate 513; Second iron plate 514; Coil assembly 520; The cover is 600. Detailed Implementation

[0019] Electromagnetic relays, as a core electrical control component, are widely used in industrial automation, new energy vehicles, photovoltaic inverters, and server power supplies. Their main function is to control the switching of large currents or high voltages at the output contacts through a small current excitation of the input coil, thereby achieving key functions such as automatic circuit control, signal conversion, electrical isolation, and circuit protection. In current electromagnetic relays, especially high-voltage DC relays, a conductive sheet with a certain degree of elasticity is typically used as a spring (also called a moving terminal), and its displacement is achieved through a mechanical pushing mechanism. However, with the trend towards miniaturization and high power density in related technologies, the physical distance between two adjacent moving terminals in electromagnetic relays is constantly being compressed, resulting in smaller creepage distances (the shortest path between two conductive parts or between a conductive part and the equipment interface measured along the insulating surface) or clearances (the shortest spatial distance between two conductive parts or between a conductive part and the equipment interface). In high-temperature, high-humidity, or high-pollution environments, a small creepage distance can easily lead to surface flashover or breakdown, causing a significant decrease in the relay's insulation withstand voltage performance, and consequently, its safety and reliability cannot meet the requirements of high-voltage applications.

[0020] Based on this, refer to Figures 1 to 4 The image shows a preferred embodiment of the electromagnetic relay 1000 provided by the present invention. The electromagnetic relay 1000 mainly includes a housing 100, a pusher 200, a moving terminal group 300, a stationary terminal group 400, a drive mechanism 500, and an outer cover. The housing 100, serving as a base, is typically injection-molded from high-temperature resistant, high-flame-retardant insulating plastic and is used to house and support the internal components. The outer cover cooperates with the housing 100 to form a closed or semi-closed receiving cavity, providing dust protection and mechanical protection.

[0021] Reference Figures 1 to 4As shown, specifically, the stationary terminal group 400 includes two stationary terminals 410. These two stationary terminals 410 serve as the main current input or output ports, are fixedly mounted on the housing 100, and are strictly symmetrically distributed on both sides of the pusher 200 along its sliding direction (it should be noted that the sliding direction of the pusher 200 can be consistent with the length direction of the pusher 200). To achieve multi-channel control or improve disconnection capability, the stationary terminal group 400 is provided with at least two, and the at least two stationary terminal groups 400 are spaced apart along the sliding direction of the pusher 200, forming multiple pairs of contact structures. Stationary contacts 411 are respectively provided on the side of the two stationary terminals 410 facing each other in space. The moving terminal group 300 includes two moving terminals 310. These two moving terminals 310 are mounted on the pusher 200 and spaced apart along the sliding direction of the pusher 200. Moving contacts 340 are provided on the side of the two moving terminals 310 facing away from each other. At least one moving terminal group 300 is provided, and each moving terminal group 300 is located in the space between two adjacent stationary terminal groups 400 in the assembly position. Under the action of the drive mechanism 500, the moving terminal group 300 can only selectively abut with one of the stationary terminal groups 400. Specifically, the circuit is turned on and off through the physical contact or separation of the moving contact 340 and the stationary contact 411. The moving contact 340 and the stationary contact 411 are welded. Compared with the traditional riveting contact process, it is beneficial to reduce the product volume and contact heat generation under the same specifications. The drive mechanism 500 is installed on one side or bottom of the housing 100, and the pusher 200 is slidably installed in the internal guide rail or guide groove of the housing 100. The moving terminal group 300 is firmly snapped or inserted into the pusher 200. The drive mechanism 500 can output linear displacement to drive the pusher 200 to slide back and forth in the sliding direction, thereby causing the pusher 200 to drive the moving terminal group 300 on it to separate from one of the adjacent stationary terminal groups 400 (disconnect the circuit), and continue to move until it abuts against another adjacent stationary terminal group 400 (connect the circuit), thereby realizing electrical switching control functions such as dual power supply switching or forward and reverse rotation control.

[0022] It is important to explain that, referring to Figure 5As shown, the moving terminal 310, being a conductive component, inevitably has a portion of its structure exposed outside the insulator of the pusher 200. This portion extending outside the pusher 200 is called the protrusion 311. In high-voltage applications, there is an extremely high potential difference between the protrusions 311 of two adjacent moving terminals 310, thus requiring strict insulation. To address the problem of insufficient creepage distance in the prior art, this embodiment creatively provides a protruding insulating portion 210 on the pusher 200. This insulating portion 210 is made of insulating material and is precisely positioned between the protrusions 311 of the two moving terminals 310, forming a physical barrier. The insulating portion 210 can be an integral structure made with the main body of the pusher 200 using injection molding to ensure the overall strength of the structure; or it can be a separate structure, fixed to the pusher 200 by snap-fit ​​or ultrasonic welding. With this configuration, when electrons or ions move between the surfaces of the two moving terminals 310, they must bypass the physical barrier of the insulating part 210, thus increasing the path length. This increases the creepage distance and electrical clearance between the two moving terminals 310, making the insulation distance much greater than the straight-line distance, significantly improving the safety and reliability of the relay. Furthermore, this embodiment optimizes the layout of the pusher 200 and the terminals, utilizing the presence of the insulating part 210 to increase the physical space of the contact working chamber. This allows for greater space for the arc generated when the contacts break to stretch and cool, preventing the high-temperature arc from burning the surrounding insulation and causing carbonization, thereby preventing insulation degradation. When the magnetic circuit drives the pusher 200 to slide, the optimized insulation structure does not increase the mass burden of the moving parts, allowing for a more compact magnetic circuit design and a smaller air gap, thus improving magnetic circuit efficiency and shortening the relay switching time. This better meets the stringent requirements of server power supplies or uninterruptible power supply systems for millisecond-level rapid switching, achieving seamless and rapid switching between primary and backup power supplies.

[0023] Reference Figure 5 and Figure 6 As shown, the shape of the insulating portion 210 is further defined. In some embodiments, the projection of the insulating portion 210 onto a plane perpendicular to the sliding direction of the pusher 200 completely covers the projection of the protrusion 311 onto a plane perpendicular to the sliding direction of the pusher 200. This feature can also be understood as follows: if the insulating portion 210 is viewed from a side view along the sliding direction of the pusher 200, the insulating portion 210 acts like a wall, completely blocking the protrusion 311 of the moving terminal 310, so that there is no direct air path between the two moving terminals 310. This "shadow shielding" design can maximally block the linear drift of charged particles under the action of the electric field, forcing them to circle around the surface of the insulating portion 210, thereby further increasing the creepage distance and electrical clearance between the protrusions 311 and effectively preventing air breakdown.

[0024] Reference Figure 6 As shown, to maximize the insulation effect, in some embodiments, along the length direction of the moving terminal 310 (i.e., the horizontal direction perpendicular to the sliding direction of the pusher 200), Figure 6 (In the indicated length direction), the side of the insulating part 210 is not flush with the moving terminal 310, but rather protrudes significantly from the side of the moving terminal 310. (Refer to...) Figure 7 and Figure 8 As shown, this design constructs a three-dimensional insulating barrier, preventing the creepage paths of two adjacent moving terminals 310 along the length of the pusher 200 from directly crossing each other. Instead, the creepage paths must extend along the side of the insulating portion 210, bypass the protruding end, and return, with a total creepage distance of D1+D2+D3. This cumulative effect significantly increases the creepage distance, and because the insulating portion 210 has a thin-walled structure, it occupies a small space and does not cause the relay to expand in size.

[0025] Reference Figure 6 As shown, similarly, in some embodiments, along the height direction of the moving terminal 310, the side of the insulating portion 210 also protrudes beyond the side of the moving terminal 310 (including the upper side and the lower side). See reference... Figure 9 and Figure 10 As shown, this configuration allows the creepage distance between two adjacent moving terminals 310 in the height direction of the pusher 200 to become D4+D5+D6, significantly increasing the creepage distance. Through the dual protrusion design in both the length and height directions, the insulating portion 210 effectively forms an isolation wall, comprehensively improving insulation performance.

[0026] Besides external insulation, the insulation of internal mounting components is equally crucial. (See reference...) Figure 5 and Figure 13 As shown, in some embodiments, the pusher 200 comprises two parts: a mounting base 220 and a cover plate 230. This split design facilitates the precision assembly of the moving terminal 310. The mounting base 220 has at least two mounting grooves 221 spaced apart along the sliding direction of the pusher 200. The shape of the mounting grooves 221 matches the shape of the root of the moving terminal 310, and the two moving terminals 310 are directly inserted into the mounting grooves 221 for positioning. The cover plate 230 serves as a clamping component and is fixed to the mounting base 220 by means of snap-fit ​​connection, thermal riveting, or adhesive bonding, thereby firmly locking the moving terminal 310 within the mounting base 220. The entire pusher 200 (including the mounting base 220 and the cover plate 230) is made of high-insulation engineering plastic. The spaced mounting grooves 221 utilize the material thickness of the mounting base 220 body to physically separate the two moving terminals 310 at their roots, thereby improving insulation performance.

[0027] Reference Figure 5 and Figure 13As shown, to further enhance the internal insulation level and prevent current from creeping along the mounting micro-gap under high voltage, in some embodiments, the main body of the insulating portion 210 is formed on the mounting base 220. The mounting base 220 is provided with a slot 211, which is located between two mounting grooves 221, that is, spatially between two moving terminals 310, and a portion of the slot 211 extends onto the main body of the insulating portion 210. Correspondingly, the cover plate 230 is provided with a protruding boss 231, the shape of which precisely matches the slot 211, and during assembly, the boss 231 is tightly inserted into the slot 211. (Refer to...) Figure 11 and Figure 12 As shown, with this configuration, the creepage distance of the two moving terminals 310 inside the mounting base 220 is no longer a simple straight line, but extends in a zigzag pattern along the mating surfaces of the boss 231 and the slot 211, with a creepage distance of D7+D8+D9+D10+D11. By setting the boss 231 and the slot 211, the creepage distance is significantly increased, and the tight contact of the mating surfaces increases the difficulty of air gap breakdown, significantly improving the insulation performance for the portion of the moving terminal 310 located inside the mounting base 220.

[0028] It should also be noted that in some other embodiments, the boss 231 is made of insulating material, and the volume of the boss 231 on the cover plate 230 can be enlarged, so that part of the structure of the boss 231 forms the aforementioned insulating part 210. This is equivalent to the insulating part 210 and the cover plate 230 being an integral structure. After the cover plate 230 is installed on the mounting base 220, the boss 231 is directly inserted between the two moving terminals 310, which can increase the insulation distance between the two moving terminals 310. This provides the same insulation function as the insulating part 210 in the above embodiment, which is formed on the mounting base 220. In this embodiment, the insulating part 210 is formed on the cover plate 230, and this situation is also within the protection scope of this application.

[0029] Reference Figure 13 As shown, in some embodiments, the boss 231 extends around an axis parallel to the length direction of the cover plate 230. This can be understood as the boss 231 extending along a circumferential direction or a rectangular circumferential direction. The boss 231 is preferably a square closed-loop structure or a long strip structure. This arrangement allows the boss 231 to completely block the straight path between two adjacent moving terminals 310 in three-dimensional space. The combination of the boss 231 and the slot 211 greatly increases the surface area, thereby increasing the creepage area and improving the insulation performance.

[0030] It needs to be explained that during operation, the moving terminal 310 moves under control, thus contacting different stationary terminals 410 and receiving a strong reaction force from the spring 330 of the stationary terminal 410. However, because the moving terminal 310 inevitably heats up due to the Joule effect when conducting large currents, the yield strength and elastic modulus of the metal material decrease at high temperatures, weakening its resistance to deformation. Therefore, in long-term operation, if the moving terminal 310 is a one-piece structure, it may undergo plastic deformation under the combined coupling effect of conductive heating (thermal stress) and reaction force (mechanical stress), leading to a decrease in contact pressure and an increase in contact resistance, thus creating a vicious cycle and ultimately affecting the working performance of the electromagnetic relay 1000.

[0031] Reference Figure 14 As shown, based on this, the present invention improves the structure of the moving terminal 310. In some embodiments, the moving terminal 310 includes two independent components: a terminal body 320 and a spring piece 330. The spring piece 330 has a hook 331 or a similar mechanical locking structure on one side along its thickness direction, and the spring piece 330 is engaged and fixed to the terminal body 320 by the hook 331. The terminal body 320 is mainly responsible for carrying current, and therefore is made of a material with extremely high conductivity but slightly weak elasticity (such as copper or a high-conductivity copper alloy) to reduce heat generation; while the spring piece 330 is mainly responsible for providing contact pressure and rebound force, and therefore is made of an elastic material with high elastic modulus, good fatigue resistance, and high temperature resistance (such as beryllium copper, phosphor bronze, or stainless steel). It can be understood that through the above arrangement, the spring piece 330 and the terminal body 320 are separate structures, achieving "electromechanical decoupling". When the terminal body 320 heats up due to conductivity, the heat will be transferred, but since the two are in separate contact, there is contact thermal resistance, and the spring 330 itself does not carry the main current (or only a small current), the temperature rise of the spring 330 is low, the heat is less affected, its material properties remain stable, and it can still withstand the reaction force and rebound well, avoiding deformation of the terminal body 320 during long-term operation, while also ensuring constant contact pressure.

[0032] Because the moving terminal 310 in this embodiment of the invention adopts a separate structure of terminal body 320 and spring contact 330, the terminal body 320 is not easily deformed during long-term use, thus improving the working stability of the electromagnetic relay 1000 in this embodiment of the invention. In addition, in conjunction with the aforementioned layout, the moving terminal group 300 is arranged in a space between two adjacent stationary terminal groups 400, and the moving terminal group 300 includes two moving terminals 310 arranged at intervals. This gives the electromagnetic relay 1000 the characteristics of long electrical gap between contact groups and short flight time (i.e., short suspension time during contact switching). Thus, while meeting the sufficient isolation requirements between switching power supplies, the magnetic circuit air gap is reduced to achieve rapid switching between switching power supplies, which is of great significance for protecting sensitive loads.

[0033] Reference Figure 14 As shown, in one embodiment, the spring 330 is naturally curved or pre-bent. Both ends of the spring 330 abut against both ends of the terminal body 320 along its length, and the middle portion of the spring 330 is arched and curved, creating a significant gap between it and the middle portion of the terminal body 320. This design minimizes the contact area between the spring 330 and the terminal body 320 (only the two ends contact), further blocking heat conduction. This reduces the impact of heat generation on the spring 330 when the terminal body 320 heats up due to conductivity. Simultaneously, the gap allows the spring 330 to undergo elastic deformation under pressure without interfering with the terminal body 320. It should be noted that the size of the gap between the middle portion of the spring 330 and the terminal body 320 is not specifically limited here and can be designed according to specific elastic force requirements.

[0034] Reference Figure 3 As shown, in one embodiment, there are four stationary terminal groups 400 and two moving terminal groups 300. It should be noted that one moving terminal group 300 is located in the interval between two adjacent stationary terminal groups 400, and the other moving terminal group 300 is located in the interval between another two adjacent stationary terminal groups 400. This staggered arrangement maximizes space utilization.

[0035] Reference Figures 2 to 5 As shown, in one embodiment, the pusher 200 has a groove 222, and the drive mechanism 500 includes a rotating assembly 510 and a coil assembly 520. The rotating assembly 510 has a protrusion 5111, which engages with the groove 222. It should be noted that the coil assembly 520 is located above or to one side of the housing 100. When energized, the coil assembly 520 generates a magnetic field, driving the rotating assembly 510 to rotate around its axis. The rotational motion of the rotating assembly 510 is converted into linear motion of the pusher 200 through the engagement of the protrusion 5111 and the groove 222, causing the protrusion 5111 to oscillate and move the pusher 200. It can be understood that, through the above arrangement, utilizing the lever principle or torque amplification principle, the pusher 200 can be driven quickly to achieve the switching function of the electromagnetic relay 1000.

[0036] Reference Figures 2 to 5 As shown, it should be noted that the rotating assembly 510 includes a mounting member 511 (such as an armature bracket), a magnet 512 (such as a permanent magnet, used to provide a polarizing magnetic field or restoring force), a first iron plate 513, and a second iron plate 514 (a magnetically conductive yoke). The magnet 512 is mounted inside the mounting member 511, a protrusion 5111 is provided on the mounting member 511, and the first iron plate 513 and the second iron plate 514 are mounted parallel and spaced apart on the mounting member 511, forming part of a magnetic circuit. (Refer to...) Figure 5As shown, in one embodiment, the groove 222 is located at the middle position of the pusher 200 along its length, which ensures that the pusher 200 is subjected to balanced forces and reduces friction and jamming during movement. With the above arrangement, the electromagnetic relay 1000 has a more reasonable structural layout, and the product size is greatly reduced, meeting the miniaturization requirements of modern electronic devices.

[0037] The embodiments of the present invention have been described in detail above, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described above with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0038] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, inside, outside, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limiting this invention.

[0039] In the description of this invention, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0040] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0041] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electromagnetic relay, characterized in that, include: case; The pusher is slidably mounted on the housing; A movable terminal assembly includes two movable terminals, which are mounted on the pusher and arranged at intervals along the sliding direction of the pusher. The portion of the movable terminal extending outside the pusher is an extension. The pusher is provided with an insulating part, which is located between the extended parts of the two moving terminals.

2. The electromagnetic relay according to claim 1, characterized in that, The projection of the insulating part onto a plane perpendicular to the sliding direction of the pusher completely covers the projection of the extended part onto a plane perpendicular to the sliding direction of the pusher.

3. The electromagnetic relay according to claim 2, characterized in that, Along the length direction of the moving terminal, the side of the insulating portion protrudes beyond the side of the moving terminal.

4. The electromagnetic relay according to claim 2, characterized in that, Along the height direction of the moving terminal, the side of the insulating portion protrudes beyond the side of the moving terminal.

5. The electromagnetic relay according to claim 1, characterized in that, The pusher includes a mounting base and a cover plate. The mounting base has at least two mounting slots spaced apart along the sliding direction of the pusher. The two moving terminals are respectively mounted in the mounting slots. The cover plate is connected to the mounting base by a snap-fit ​​to fix the moving terminals.

6. The electromagnetic relay according to claim 5, characterized in that, The insulating portion is formed on the mounting base, the mounting base is provided with a slot, the slot is located between the two moving terminals, and the cover plate is provided with a boss, the boss being inserted into the slot.

7. The electromagnetic relay according to claim 6, characterized in that, The boss extends about an axis parallel to the length direction of the cover plate.

8. The electromagnetic relay according to claim 1, characterized in that, The moving terminal includes a terminal body and a spring piece. The spring piece has a hook on one side along its thickness direction, and the spring piece is engaged with the terminal body through the hook.

9. The electromagnetic relay according to claim 8, characterized in that, The two ends of the spring contact along its length direction respectively abut against the two ends of the terminal body, and the middle part of the spring contact is bent and has a gap with the middle part of the terminal body.

10. The electromagnetic relay according to claim 1, characterized in that, The electromagnetic relay also includes a stationary terminal group and a drive mechanism; The stationary terminal group includes two stationary terminals, which are installed on the housing and symmetrically distributed on both sides of the pusher along the sliding direction of the pusher. There are at least two stationary terminal groups, and at least two stationary terminal groups are spaced apart along the length direction of the pusher. The drive mechanism is mounted on the housing and is capable of driving the pusher to move so that the moving terminal group separates from one of the adjacent stationary terminal groups and abuts against the other adjacent stationary terminal group; The moving terminal group is provided with at least one, and each moving terminal group is located in the interval between two adjacent stationary terminal groups and can only abut with one of the stationary terminal groups.

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