Contact system and electromagnetic relay

Abstract

The utility model discloses a kind of contact system and electromagnetic relay, it is related to relay technical field, contact system includes pedestal, and the static terminal subassembly and dynamic terminal subassembly of pedestal being equipped;Static terminal subassembly includes current-carrying static contact and arc static contact;Dynamic terminal subassembly includes current-carrying moving contact and arc moving contact, current-carrying moving contact is oppositely arranged with current-carrying static contact, arc moving contact is oppositely arranged with arc static contact, the gap between arc static contact and arc moving contact is less than the gap between current-carrying static contact and current-carrying moving contact, to make contact system close arc static contact and arc moving contact first in current-carrying static contact and current-carrying moving contact conduction, and arc static contact and arc moving contact are later than current-carrying static contact and current-carrying moving contact separation when contact system breaks;The utility model can solve the problem in prior art caused by load current and voltage grade promotion, such as relay temperature rise, contact easy adhesion, contact resistance is big etc.

Description

Technical Field

[0001] This utility model relates to the field of relay technology, and in particular to a contact system and an electromagnetic relay. Background Technology

[0002] Electromagnetic relays in photovoltaic inverters are used in the protection circuits on the input / output side. With the development of photovoltaic inverters, there are higher requirements for the load current and voltage levels of electromagnetic relays. The resulting risks are that the relays generate more heat, have a higher temperature rise, and are more prone to contact sticking. Utility Model Content

[0003] The main purpose of this invention is to propose a contact system and an electromagnetic relay, which aims to solve the problems in the prior art caused by the increase in relay temperature, easy sticking of contacts, and high contact resistance due to the increase in load current and voltage level.

[0004] To achieve the above objectives, the contact system proposed in this utility model includes: Base; A stationary terminal assembly, disposed on the base, includes a current-carrying stationary contact and an arc-ignition stationary contact; and A moving terminal assembly is disposed on the base. The moving terminal assembly includes a current-carrying contact and an arc-ignition moving contact. The current-carrying contact is disposed opposite to the current-carrying stationary contact, and the arc-ignition moving contact is disposed opposite to the arc-ignition stationary contact. The gap between the arc-ignition stationary contact and the arc-ignition moving contact is smaller than the gap between the current-carrying stationary contact and the current-carrying contact, so that when the contact system is closed, the arc-ignition stationary contact and the arc-ignition moving contact conduct before the current-carrying stationary contact and the current-carrying contact, and when the contact system is disconnected, the arc-ignition stationary contact and the arc-ignition moving contact separate after the current-carrying stationary contact and the current-carrying contact.

[0005] In one embodiment, at least one of the current-carrying stationary contact and the current-carrying contact is made of a low-resistance material; And / or, at least one of the arc-ignition stationary contact and the arc-ignition moving contact is made of a material with high anti-adhesion properties.

[0006] In one embodiment, the radius of curvature of the contact surface of the arcing stationary contact is smaller than that of the contact surface of the current-carrying stationary contact; the radius of curvature of the contact surface of the arcing moving contact is smaller than that of the contact surface of the current-carrying moving contact.

[0007] In one embodiment, the contact system further includes an electromagnetic drive assembly and a reset elastic element. The electromagnetic drive assembly includes a coil frame, an electromagnetic coil, an iron core, a yoke, and an armature. The coil frame is mounted on the base and has a cavity. The electromagnetic coil is wound around the periphery of the coil frame. The iron core is located in the cavity. The yoke is located on one side of the coil frame and connected to the iron core. The armature is connected to the moving terminal assembly and is rotatably attached to the blade edge of the yoke. The reset elastic element is located on the base, and the elastic arm of the reset elastic element is attached to the armature.

[0008] In one embodiment, the contact system further includes a movable elastic element, one end of which is connected to the movable terminal assembly, and the other end of which is connected to the armature.

[0009] In one embodiment, the moving terminal assembly further includes a moving contact bridge and a moving contact elastic member. The moving contact bridge is disposed between the moving contact and the moving contact elastic member. The moving contact bridge is connected to the moving elastic member. The moving contact elastic member has the arc-ignition moving contact on one side facing the moving contact bridge.

[0010] In one embodiment, the contact system further includes an insulating element that connects the movable elastic element to the armature.

[0011] In one embodiment, the insulating member is disposed on the side of the yoke away from the coil frame, and the armature includes a first plate and a second plate that are bent and connected. The first plate is connected to the insulating member, and the second plate overlaps the yoke.

[0012] In one embodiment, the contact system further includes a housing, which is connected to the base to form a mounting cavity, and the stationary terminal assembly and the moving terminal assembly are disposed in the mounting cavity.

[0013] This utility model also proposes an electromagnetic relay, including the contact system described above.

[0014] The technical solution of this utility model involves setting a stationary terminal assembly and a moving terminal assembly on a base. The stationary terminal assembly contains a current-carrying stationary contact and an arc-ignition stationary contact, while the moving terminal assembly contains a corresponding current-carrying current-ignition moving contact. This allows the current-carrying stationary and moving contacts to conduct the load current, while the arc-ignition stationary and moving contacts handle the generation and extinguishing of the arc during the switching process of the contact system. Specifically, the gap between the arc-ignition stationary and moving contacts is designed to be smaller than the gap between the current-carrying stationary and moving contacts. This ensures that during the closing process of the contact system, the arc-ignition stationary and moving contacts make contact and conduct before the current-carrying stationary and moving contacts; and during the opening process, the arc-ignition stationary and moving contacts separate after the current-carrying stationary and moving contacts. This ensures that the arc generated during the contact system's engagement and disengagement is always concentrated on the arc-ignition stationary and moving contacts, preventing the arc from burning the current-carrying stationary and moving contacts. Compared to existing technologies where a single contact simultaneously performs both current-carrying and arc-extinguishing functions, resulting in issues such as high temperature rise, easy adhesion, and short lifespan, this solution, through functionally separated current-carrying and arc-extinguishing contacts, not only improves the anti-adhesion performance of the contact system under high-voltage and high-current conditions of electromagnetic relays, but also controls contact resistance and temperature rise, thereby enhancing the reliability, safety, and service life of the contact system products. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the structure of an embodiment of the contact system provided by this utility model; Figure 2 A schematic diagram of another embodiment of the contact system provided by this utility model; Figure 3 A schematic diagram of another embodiment of the contact system provided by this utility model; Figure 4 A schematic diagram of another embodiment of the contact system provided by this utility model; Figure 5 A schematic diagram of another embodiment of the contact system provided by this utility model; Figure 6 A schematic diagram of another embodiment of the contact system provided by this utility model; Figure 7 A schematic diagram of another embodiment of the contact system provided by this utility model; Figure 8 This is a schematic diagram of another embodiment of the contact system provided by this utility model.

[0017] Explanation of icon numbers: 100. Contact system; 10. Base; 20. Stationary terminal assembly; 21. Current-carrying stationary contact; 22. Arc-igniting stationary contact; 30. Moving terminal assembly; 31. Current-carrying moving contact; 32. Arc-igniting moving contact; 33. Moving contact bridge; 34. Moving contact elastic element; 40. Electromagnetic drive assembly; 41. Coil frame; 42. Electromagnetic coil; 43. Iron core; 44. Yoke; 45. Armature; 451. First plate; 452. Second plate; 50. Reset elastic element; 60. Movable elastic element; 70. Insulating element; 80. Housing; 90. Rivet.

[0018] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0020] Electromagnetic relays in photovoltaic inverters are used in the protection circuits on the input / output side. With the development of photovoltaic inverters, there are higher requirements for the load current and voltage levels of electromagnetic relays. The resulting risks are that the relays generate more heat, have a higher temperature rise, and are more prone to contact sticking.

[0021] Therefore, this utility model proposes a contact system 100, which aims to solve the problems of increased relay temperature, easy contact sticking, and high contact resistance caused by the increase in load current and voltage level in the prior art.

[0022] Please see Figures 1 to 8In one embodiment of this utility model, the contact system 100 includes a base 10, a stationary terminal assembly 20, and a moving terminal assembly 30. The stationary terminal assembly 20 is disposed on the base 10 and includes a current-carrying stationary contact 21 and an arc-ignition stationary contact 22. The moving terminal assembly 30 is disposed on the base 10 and includes a current-carrying moving contact 31 and an arc-ignition moving contact 32. The current-carrying moving contact 31 is disposed opposite to the current-carrying stationary contact 21, and the arc-ignition moving contact 32 is disposed opposite to the current-carrying stationary contact 21. The arcing stationary contact 22 is arranged opposite to each other, and the gap between the arcing stationary contact 22 and the arcing moving contact 32 is smaller than the gap between the current-carrying stationary contact 21 and the current-carrying moving contact 31, so that when the contact system 100 is closed, the arcing stationary contact 22 and the arcing moving contact 32 conduct before the current-carrying stationary contact 21 and the current-carrying moving contact 31, and when the contact system 100 is disconnected, the arcing stationary contact 22 and the arcing moving contact 32 separate after the current-carrying stationary contact 21 and the current-carrying moving contact 31.

[0023] It should be noted that the electromagnetic relay in this invention is applied to the protection circuit on the input / output side of the photovoltaic inverter. A photovoltaic inverter is a core power electronic device that converts the direct current (DC) generated by solar cell modules into alternating current (AC) that meets the requirements of the power grid or local load. It is a key component in photovoltaic power generation systems to achieve grid-connected, off-grid power supply, or energy storage interaction. In actual operation, the input side of a photovoltaic inverter is typically connected to a high-voltage DC bus (e.g., 600V to 1500V DC), while the output side is connected to the AC power grid or electrical load. Its operating environment is characterized by high voltage levels, large currents, frequent start-ups and shutdowns, inductive / capacitive surges, and the potential for short circuits, overloads, lightning strikes, or islanding. Therefore, it is crucial to install a reliable protection circuit on the input / output side. This protection circuit must maintain low-loss conduction of the main circuit during normal system operation and quickly and safely disconnect the power supply in the event of a fault, maintenance, or emergency shutdown to prevent equipment damage, fire risks, or personal injury accidents. As a key actuator in this protection circuit, the electromagnetic relay must possess high reliability, strong arc resistance, excellent anti-contact adhesion performance, and the ability to operate stably for a long period. However, traditional relays are prone to generating strong arcs when switching high voltage and high current, leading to contact erosion, welding, or even permanent adhesion failure, which cannot meet the stringent requirements of electromagnetic relays for high safety and long life.

[0024] Therefore, the contact system 100 proposed in this utility model includes a base 10, a stationary terminal assembly 20, and a moving terminal assembly 30. The base 10 serves as the basic support structure of the contact system 100, providing installation and positioning functions to ensure that the stationary terminal assembly 20 and the moving terminal assembly 30 can operate stably.

[0025] This embodiment has two stationary terminal assemblies 20, but this does not mean that only two stationary terminal assemblies 20 can be provided in this utility model; the specific number can be set according to actual needs. The two stationary terminal assemblies 20 are snapped onto the base 10 and fixed and sealed with adhesive. Each stationary terminal assembly 20 is made of a low-resistivity metal, such as oxygen-free copper, and serves to conduct load current and fix the photovoltaic inverter connection. Each stationary terminal assembly 20 consists of a current-carrying stationary contact 21 and an arc-ignition stationary contact 22. The current-carrying stationary contact 21 is a composite contact, composed of low-resistivity copper and a low-oxide-content silver-based composite material or silver alloy. It connects to the DC bus on the input side of the photovoltaic inverter or the AC terminal on the output side, forming part of the main power circuit and ensuring stable and efficient conduction of continuous load current when the electromagnetic relay is closed. The arc-ignition stationary contact 22 is composed of copper and a high-anti-adhesion material (high-oxide-content silver-based composite material, silver-tungsten alloy, high-nickel-content silver-nickel alloy, tungsten alloy, tungsten-molybdenum alloy, etc.). It withstands the arc impact caused by sudden current changes during the switching process of the electromagnetic relay, protecting the conductivity-sensitive current-carrying stationary contact 21 from arc damage. Compared to the current-carrying stationary contact 21, the arc-ignition stationary contact 22 has stronger anti-adhesion properties, but also higher resistivity.

[0026] The moving terminal assembly 30 is also mounted on the base 10, including a current-carrying contact 31 and an arc-ignition moving contact 32. The position of the current-carrying contact 31 corresponds to the position of the current-carrying stationary contact 21, and the position of the arc-ignition moving contact 32 corresponds to the position of the arc-ignition stationary contact 22. The current-carrying contact 31 is a composite contact, composed of low-resistivity copper and a silver-based composite material or silver alloy with low oxide content, used to connect to the electromagnetic drive assembly 40 of the contact system 100. When the contact system 100 is activated, the entire moving terminal assembly 30 moves with the electromagnetic drive assembly 40, causing the current-carrying contact 31 to contact the current-carrying stationary contact 21, thereby forming a low-resistance, high-conductivity electrical path in the closed state for long-term carrying of the operating current of the electromagnetic relay. The arcing moving contact 32 is made of copper and a high anti-adhesion material (silver-based composite material with high oxide content, silver-tungsten alloy, silver-nickel alloy with high nickel content, tungsten alloy, tungsten-molybdenum alloy, etc.). It can be used in conjunction with the arcing stationary contact 22 to handle the electric arc generated by the contact system 100 at the moment of closing or opening.

[0027] The key feature is that the gap between the arc-ignition stationary contact 22 and the arc-ignition moving contact 32 is designed to be smaller than the gap between the current-carrying stationary contact 21 and the current-carrying contact 31. This design is based on the "connect first, then disconnect" arc control principle: during the closing process of the contact system 100, because the gap between the arc-ignition stationary contact 22 and the arc-ignition moving contact 32 is smaller, they will make contact and conduct first. At this time, even if an arc is ignited due to high voltage or inductive load, the arc will only occur in the area between the arc-ignition stationary contact 22 and the arc-ignition moving contact 32; subsequently, the current-carrying contact 31 and the current-carrying stationary contact 21 will fully close and enter a low-resistance conducting state. During the disconnection process, although the current-carrying contact 31 and the current-carrying stationary contact 21 separate first, the arc-ignition stationary contact 22 and the arc-ignition moving contact 32 remain in contact, and the current is rapidly transferred to the arc-ignition stationary contact 22 and the arc-ignition moving contact 32, where the final arc breaking process is completed. By using this "arc contacts first connect, then disconnect" method, all high-energy arcs are confined to the surface of the high-temperature resistant and high-hardness arc contacts. This avoids the arc directly acting on the low-resistivity current-carrying contacts, thereby reducing the risk of contact material melting, splashing, oxidation, or adhesion caused by the high temperature of the arc. This effectively extends the electrical life and mechanical reliability of the contact system 100, ensuring its stable operation under high voltage and high current conditions.

[0028] The technical solution of this utility model is to set a stationary terminal assembly 20 and a moving terminal assembly 30 on the base 10, and to set a current-carrying stationary contact 21 and an arc-ignition stationary contact 22 in the stationary terminal assembly 20, and to set a current-carrying contact 31 and an arc-ignition moving contact 32 in the moving terminal assembly 30, so that the current-carrying stationary contact 21 and the current-carrying contact 31 are used to conduct the load current, and the arc-ignition stationary contact 22 and the arc-ignition moving contact 32 are used to bear the generation and extinguishing of the electric arc during the switching process of the contact system 100. Specifically, the gap between the arc-ignition stationary contact 22 and the arc-ignition moving contact 32 is designed to be smaller than the gap between the current-carrying stationary contact 21 and the current-carrying contact 31. This ensures that during the closing process of the contact system 100, the arc-ignition stationary contact 22 and the arc-ignition moving contact 32 make contact and conduct electricity before the current-carrying stationary contact 21 and the current-carrying contact 31; and during the opening process of the contact system 100, the arc-ignition stationary contact 22 and the arc-ignition moving contact 32 separate after the current-carrying stationary contact 21 and the current-carrying contact 31. In this way, the electric arc generated by the contact system 100 at the moment of engagement and disengagement is always concentrated on the arc-ignition stationary contact 22 and the arc-ignition moving contact 32, avoiding the arc from burning the current-carrying stationary contact 21 and the current-carrying contact 31. Compared to existing technologies where a single contact simultaneously performs both current-carrying and arc-extinguishing functions, resulting in issues such as high temperature rise, easy adhesion, and short lifespan, this solution, through functionally separated current-carrying and arc-extinguishing contacts, not only improves the anti-adhesion performance of the contact system 100 under high-voltage and high-current conditions of electromagnetic relays, but also controls contact resistance and temperature rise, thereby enhancing the reliability, safety, and service life of the contact system 100.

[0029] like Figures 1 to 8 As shown, in one embodiment, the radius of curvature of the contact surface of the arcing stationary contact 22 is smaller than that of the contact surface of the current-carrying stationary contact 21; the radius of curvature of the contact surface of the arcing moving contact 32 is smaller than that of the contact surface of the current-carrying moving contact 31.

[0030] In this embodiment, the contact surfaces of the arc-ignition stationary contact 22 and the arc-ignition moving contact 32 are designed to have smaller radii of curvature, meaning their surface contours are relatively "sharper" or "protruding." Meanwhile, the current-carrying stationary contact 21 and the current-carrying moving contact 31 adopt arc surfaces or near-planar structures with larger radii of curvature, making the contact area wider and smoother. This is beneficial for increasing the actual conductive area and reducing contact resistance. This structure is mainly based on the physical principle of the tip discharge effect: under the same voltage conditions, the smaller the radius of curvature of the conductor surface, the higher the local electric field strength, and the easier it is to ionize the surrounding medium (such as air), thus preferentially initiating an arc. Therefore, by designing the contact surfaces of the arc-ignition stationary contact 22 and the arc-ignition moving contact 32 with sharper geometric shapes, the arc can be actively guided to preferentially generate, concentrate, and be maintained between the arc-ignition stationary contact 22 and the arc-ignition moving contact 32 during the operation of the contact system 100. Even in the initial closing or final opening phase of the contact system 100, during the transition phase where the current-carrying stationary contact 21 and the current-carrying moving contact 31 are partially in contact or not yet completely separated, the current will still preferentially conduct or disconnect through the arcing path because the gap between the arcing stationary contact 22 and the arcing moving contact 32 is smaller, and the surface electric field of the arcing stationary contact 22 and the arcing moving contact 32 is stronger. This ensures that the high-energy arc generated during the switching process of the contact system 100 is always effectively confined within the area of ​​the arcing stationary contact 22 and the arcing moving contact 32, which are made of a high anti-adhesion material.

[0031] like Figures 1 to 8 As shown, in one embodiment, the contact system 100 further includes an electromagnetic drive assembly 40 and a reset elastic member 50. The electromagnetic drive assembly 40 includes a coil frame 41, an electromagnetic coil 42, an iron core 43, a yoke 44, and an armature 45. The coil frame 41 is disposed on the base 10 and has a cavity. The electromagnetic coil 42 is wound around the periphery of the coil frame 41. The iron core 43 is disposed in the cavity. The yoke 44 is disposed on one side of the coil frame 41 and connected to the iron core 43. The armature 45 is connected to the moving terminal assembly 30 and is rotatably attached to the blade of the yoke 44. The reset elastic member 50 is disposed on the base 10, and the elastic arm of the reset elastic member 50 is attached to the armature 45.

[0032] In this embodiment, the contact system 100 further includes an electromagnetic drive assembly 40 and a reset elastic element 50. The electromagnetic drive assembly 40 includes a coil frame 41, an electromagnetic coil 42, an iron core 43, a yoke 44, and an armature 45. The coil frame 41 is mounted on the base 10, serving as the supporting framework for the electromagnetic coil 42, and forms a cavity within it. The electromagnetic coil 42 is wound around the periphery of the coil frame 41, generating a magnetomotive force when energized. In one embodiment, the electromagnetic coil 42 includes enameled wire, and two coil terminals are snapped onto the coil frame 41, connected to the two ends of the enameled wire via solder. The iron core 43 is installed within the cavity of the coil frame 41, used to concentrate and conduct magnetic lines of force, forming the core of the magnetic circuit. The yoke 44 is disposed on one side of the coil frame 41 and connected to the iron core 43 by riveting, forming part of a closed magnetic circuit, and its top is provided with a knife edge. One end of the armature 45 is connected to the moving terminal assembly 30, and the other end is rotatably attached to the blade edge of the yoke 44. Under the action of electromagnetic attraction, it rotates around the blade edge, thereby driving the moving terminal assembly 30 to achieve the closing or opening action of the current-carrying contact 31 and the current-carrying stationary contact 21, and the arc-ignition moving contact 32 and the arc-ignition stationary contact 22. In one embodiment, at least one of the armature 45, the yoke 44, and the core 43 is made of a high-permeability material. The reset elastic member 50 is mounted on the base 10, and its elastic arm is attached to the armature 45. When the electromagnetic coil 42 is de-energized and the magnetic force disappears, the reset elastic member 50 pushes the armature 45 to reset by its own elastic force, so that the moving terminal assembly 30 is separated from the stationary terminal assembly 20, ensuring that the contact system 100 is in an open state when not in operation.

[0033] like Figures 1 to 8 As shown, in one embodiment, the contact system 100 further includes a movable elastic member 60, one end of which is connected to the movable terminal assembly 30, and the other end of which is connected to the armature 45.

[0034] In this embodiment, the movable elastic element 60 includes a movable spring piece made of a highly conductive and elastic metal material. It is connected to the moving terminal assembly 30 and the armature 45 via riveting or adhesive bonding, respectively. This allows the movement of the armature 45 to be transmitted to the moving terminal assembly 30, enabling the closing and opening of the current-carrying contact 31 and the current-carrying stationary contact 21, and the arc-ignition moving contact 32 and the arc-ignition stationary contact 22. Simultaneously, the movable elastic element 60 possesses a certain elastic deformation capacity, absorbing minor displacement deviations and assembly tolerances during the rotation of the armature 45. This avoids stress concentration or poor contact caused by rigid connections, thereby improving the stability and reliability of the contact. Furthermore, at the instant the contact system 100 closes, the movable elastic element 60 can also provide a certain contact overtravel force, ensuring sufficient and stable contact pressure between the current-carrying contact 31 and the current-carrying stationary contact 21, reducing contact resistance and suppressing the risk of instantaneous disconnection due to vibration.

[0035] like Figures 1 to 8 As shown, in one embodiment, the moving terminal assembly 30 further includes a moving contact bridge 33 and a moving contact elastic member 34. The moving contact bridge 33 is disposed between the moving contact 31 and the moving contact elastic member 34. The moving contact bridge 33 is connected to the movable elastic member 60. The moving contact elastic member 34 has an arcing moving contact 32 on the side facing the moving contact bridge 33.

[0036] In this embodiment, the moving contact bridge 33 serves as a connection and support structure, positioned between the current-carrying contact 31 and the moving contact elastic member 34. One end of the moving contact bridge 33 is fixedly connected to the current-carrying contact 31 via riveting, while the other end is connected to the movable elastic member 60, thereby transmitting the mechanical movement of the armature 45 to the entire moving terminal assembly 30. As a rigid intermediate carrier, the moving contact bridge 33 ensures a stable electrical and mechanical connection between the current-carrying contact 31 and the movable elastic member 60, while also providing a low-resistance path for the current-carrying mechanism.

[0037] The moving contact elastic element 34 can be stamped from a highly conductive and elastic metal material (such as copper alloy or stainless steel). An arc-ignition moving contact 32 is provided on the side facing the moving contact bridge 33. This arc-ignition moving contact 32 is mounted on the moving contact elastic element 34 by riveting or other fixing methods. The moving contact elastic element 34 not only serves as the mounting base for the arc-ignition moving contact 32, but also provides additional contact preload during the closing process of the contact system 100 due to its elastic properties, ensuring reliable contact between the arc-ignition moving contact 32 and the corresponding arc-ignition stationary contact 22, thus improving the stability of arc guidance. More importantly, during the breaking process, the elastic deformation capability of the moving contact elastic element 34 helps to achieve "slow-release separation" between the arc-ignition stationary contact 22 and the arc-ignition moving contact 32, extending the arc breaking time and, combined with its high anti-adhesion material properties, effectively suppressing contact rebound or welding. In addition, since the arcing moving contact 32 is set on the moving contact elastic element 34 instead of being directly fixed to the rigid moving contact bridge 33, the structural thermal stress concentration caused by the high temperature of the electric arc can be avoided, thus improving the overall durability.

[0038] like Figures 1 to 8 As shown, in one embodiment, the contact system 100 further includes an insulating member 70 that connects the movable elastic member 60 to the armature 45.

[0039] In this embodiment, the insulating component 70 is a plastic part. This plastic part can be combined with the movable elastic component 60 through overmolding or insert injection molding, and fixed to the armature 45 by rivets 90 or a secondary overmolding structure. By providing the insulating component 70, the armature 45 and the movable elastic component 60 can be isolated, preventing electrical short circuits or leakage between them, and improving the electrical safety of the contact system 100 under high-voltage conditions. At the same time, the plastic part has good mechanical strength and dimensional stability, which can buffer vibration and impact while transmitting the movement of the armature 45, improving the consistency of action. In addition, the overmolding structure can simplify the assembly process, avoid the use of additional insulating sleeves or gaskets, reduce the number of parts, and improve production efficiency.

[0040] like Figures 1 to 8 As shown, in one embodiment, the insulating member 70 is disposed on the side of the yoke 44 away from the coil frame 41, and the armature 45 includes a first plate 451 and a second plate 452 that are bent and connected. The first plate 451 is connected to the insulating member 70, and the second plate 452 overlaps the blade edge of the yoke 44.

[0041] In this embodiment, the insulating component 70 is located on the side of the yoke 44 away from the coil frame 41 and is connected to the first plate 451 of the armature 45. This achieves electrical isolation between the electromagnetic drive assembly 40 and the stationary terminal assembly 20 and the moving terminal assembly 30, reducing the risk of electrical short circuits caused by current conduction from the electromagnetic drive assembly 40 to the armature 45, and improving the safety and reliability of the contact system 100. Since the armature 45 includes a bent first plate 451 and a second plate 452, with the second plate 452 overlapping the yoke 44, the armature 45 can rotate flexibly around the overlapping point under the action of electromagnetic force, enabling rapid closing or opening of the moving terminal assembly 30, reducing energy loss, and improving the action response speed and accuracy. Furthermore, by placing the insulating component 70 on the side of the yoke 44 away from the coil frame 41 and connecting it to the first plate 451 of the armature 45, not only can the internal spatial layout of the entire contact system 100 be optimized, improving space utilization, but it also helps simplify the assembly process, reduce manufacturing costs, and facilitate maintenance and repair.

[0042] like Figures 1 to 8 As shown, in one embodiment, the contact system 100 further includes a housing 80, which is connected to and encloses the base 10 to form a mounting cavity, and the stationary terminal assembly 20 and the moving terminal assembly 30 are disposed in the mounting cavity.

[0043] In this embodiment, the housing 80 is disposed on the base 10 and connected to the base 10 by means of snap-fit, ultrasonic welding, or adhesive sealing, together forming a closed or semi-closed mounting cavity, which is used to accommodate and protect key functional components such as the stationary terminal assembly 20, the moving terminal assembly 30, the electromagnetic drive assembly 40, and the reset elastic element 50. The closed design helps to isolate external environmental factors such as dust, moisture, salt spray, and corrosive gases from intruding into key functional components such as the stationary terminal assembly 20 and the moving terminal assembly 30, thereby improving the environmental adaptability and long-term reliability of the contact system 100 in outdoor photovoltaic application scenarios.

[0044] Understandably, in high-voltage applications (such as 1500V DC photovoltaic systems), the casing 80 can be made of flame-retardant engineering plastics with high CTI (Comparative Tracking Index) values ​​(such as PBT, PA66, etc.), which not only meet the requirements of electrical insulation and creepage distance, but also effectively suppress the formation of surface flashover or carbonization channels caused by electric arc, thereby improving dielectric strength and fire safety.

[0045] This utility model also proposes an electromagnetic relay, which includes a contact system 100. The specific structure of the contact system 100 is as described in the above embodiments. Since this electromagnetic relay adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0046] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A contact system, characterized in that, include: Base; A stationary terminal assembly is disposed on the base, the stationary terminal assembly including a current-carrying stationary contact and an arc-ignition stationary contact; as well as A moving terminal assembly is disposed on the base. The moving terminal assembly includes a current-carrying contact and an arc-ignition moving contact. The current-carrying contact is disposed opposite to the current-carrying stationary contact, and the arc-ignition moving contact is disposed opposite to the arc-ignition stationary contact. The gap between the arc-ignition stationary contact and the arc-ignition moving contact is smaller than the gap between the current-carrying stationary contact and the current-carrying contact, so that when the contact system is closed, the arc-ignition stationary contact and the arc-ignition moving contact conduct before the current-carrying stationary contact and the current-carrying contact, and when the contact system is disconnected, the arc-ignition stationary contact and the arc-ignition moving contact separate after the current-carrying stationary contact and the current-carrying contact.

2. The contact system as claimed in claim 1, characterized in that, At least one of the current-carrying stationary contact and the current-carrying moving contact is made of a low-resistance material; And / or, at least one of the arc-ignition stationary contact and the arc-ignition moving contact is made of a material with high anti-adhesion properties.

3. The contact system as described in claim 1, characterized in that, The radius of curvature of the contact surface of the arc-igniting stationary contact is smaller than that of the contact surface of the current-carrying stationary contact; the radius of curvature of the contact surface of the arc-igniting moving contact is smaller than that of the contact surface of the current-carrying moving contact.

4. The contact system as claimed in claim 1, characterized in that, The contact system further includes an electromagnetic drive assembly and a reset elastic element. The electromagnetic drive assembly includes a coil frame, an electromagnetic coil, an iron core, a yoke, and an armature. The coil frame is mounted on the base and has a cavity. The electromagnetic coil is wound around the periphery of the coil frame. The iron core is located in the cavity. The yoke is located on one side of the coil frame and connected to the iron core. The armature is connected to the moving terminal assembly and is rotatably attached to the blade edge of the yoke. The reset elastic element is located on the base, and the elastic arm of the reset elastic element is attached to the armature.

5. The contact system as described in claim 4, characterized in that, The contact system also includes a movable elastic element, one end of which is connected to the movable terminal assembly, and the other end of which is connected to the armature.

6. The contact system as described in claim 5, characterized in that, The moving terminal assembly further includes a moving contact bridge and a moving contact elastic element. The moving contact bridge is disposed between the moving contact and the moving contact elastic element. The moving contact bridge is connected to the moving elastic element. The moving contact elastic element has the arc-ignition moving contact on one side facing the moving contact bridge.

7. The contact system as claimed in claim 6, characterized in that, The contact system also includes an insulating element that connects the movable elastic element to the armature.

8. The contact system as claimed in claim 7, characterized in that, The insulating component is located on the side of the yoke away from the coil frame. The armature includes a first plate and a second plate that are bent and connected. The first plate is connected to the insulating component, and the second plate overlaps the yoke.

9. The contact system as described in any one of claims 1 to 8, characterized in that, The contact system also includes a housing, which is connected to the base to form a mounting cavity, and the stationary terminal assembly and the moving terminal assembly are disposed in the mounting cavity.

10. An electromagnetic relay, characterized in that, Includes the contact system as described in any one of claims 1 to 9.

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