Arc extinguishing structure for relay and relay

Abstract

This application relates to an arc-extinguishing structure for a relay and a relay. The relay includes an arc-extinguishing structure comprising an insulating cover, a magnetic plate, and an insulating plate. The insulating cover has a closed end and an open end. The magnetic plate is spaced apart from the open end of the insulating cover and is connected to at least one of the end face of the open end, the frame, and the magnetic plate via a frame. A portion of the insulating plate extends from the open end into the insulating cover and is disposed close to the inner wall of the insulating cover, so that the insulating plate can shield the inner wall of the insulating cover. Therefore, when the internal contacts of the relay are ablated by an electric arc and generate splashed metal particles, the metal particles can be shielded by the insulating plate and will not splash onto the inner wall of the insulating cover, thereby reducing the contamination of the insulating cover by metal particles. This can prevent the stationary contacts from forming a low-insulation circuit through the insulating cover, which could lead to relay breakdown and failure, thereby improving the durability of the relay.

Description

Technical Field

[0001] This application relates to the field of electronic control device technology, and in particular to an arc extinguishing structure for a relay and the relay itself. Background Technology

[0002] A relay is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit). It is commonly used in automatic control circuits. Its principle is actually to use a smaller current to control a larger current, thus acting as an "automatic switch". Therefore, it plays a role in automatic adjustment, safety protection, and circuit switching in the circuit, and is widely used in fields such as new energy vehicles.

[0003] High-voltage DC relays are a type of relay. Most existing high-voltage DC relays adopt a direct-acting structure with a moving spring, utilizing two stationary contacts and one moving spring. In practical automotive applications, the contacts need to connect, disconnect, and switch under load to achieve a "switching" function. However, during relay operation, especially when disconnecting the circuit, the current between the contacts is suddenly interrupted, generating an electric arc. Therefore, an insulating cover must be installed to isolate the electric arc generated during operation from the external environment and to suppress its generation and spread, ensuring safe circuit operation. However, during this process, the internal contacts are easily eroded by the electric arc, producing metal particles. Furthermore, after the contacts are eroded by the arc, the flying metal particles can contaminate the inner wall of the insulating cover, causing the originally insulating cover to become contaminated, leading to an insulation short circuit and a decrease in insulation capacity. Utility Model Content

[0004] Therefore, it is necessary to address the problem that the insulating cover of existing relays is easily contaminated by splashed metal particles caused by the burning of internal contacts during operation, and to provide an arc-extinguishing structure for relays and a relay including the arc-extinguishing structure, in order to solve the above-mentioned problems.

[0005] According to one aspect of this application, an arc-extinguishing structure for a relay is provided, comprising:

[0006] An insulating cover having a closed end and an open end, the closed end and the open end being disposed opposite each other in an axial direction defined by a central axis;

[0007] A magnetic guide plate is provided at intervals from the opening end of the insulating cover along the axial direction, and the magnetic guide plate is connected to the end face of the opening end through a frame plate;

[0008] An insulating plate, a portion of which extends from the open end into the insulating cover and is disposed close to the inner cavity sidewall of the insulating cover, the portion of the insulating plate exposed outside the insulating cover being connected to at least one of the end face of the open end, the frame plate, and the magnetic conductive plate.

[0009] In one embodiment, the insulating plate has a first surface and a second surface on the side of the inner cavity sidewall facing the insulating cover, and the first surface and the second surface are connected in sequence from the open end to the closed end.

[0010] The first surface is attached to the inner cavity sidewall of the insulating cover, and the second surface is inclined toward the central axis or parallel to the first surface, so that the second surface and the inner cavity sidewall of the insulating cover form a clean area.

[0011] In one embodiment, the insulating plate includes an isolation portion and a connecting portion. A portion of the isolation portion extends into the insulating cover, while another portion is exposed outside the insulating cover. One end of the connecting portion is connected to the portion of the isolation portion exposed outside the insulating cover, and the other end is connected to the end face of the frame or the opening end, so that the insulating plate is suspended relative to the magnetic conductive plate.

[0012] In one embodiment, the insulating plate further includes a first insulating rib connected to the connecting portion. The end face of the first insulating rib facing the opening end protrudes from the connecting portion and abuts against the end face of the frame or the opening end, so that a gap is formed between the connecting portion and the end face of the opening end.

[0013] In one embodiment, the frame extends in a bent-out manner along the axial direction of the insulating cover, such that the frame includes at least one parallel segment parallel to the end face of the opening end, and the first insulating rib abuts against the parallel segment.

[0014] In one embodiment, the insulating plate further includes a second insulating rib connected to the connecting portion, the second insulating rib protruding from the connecting portion toward an end face away from the opening end.

[0015] In one embodiment, a metal connector is attached to the magnetic plate, and an insulating plate is connected to the end of the metal connector away from the magnetic plate, so that the insulating plate is connected to the magnetic plate through the metal connector.

[0016] In one embodiment, the insulating plate includes an isolation portion and a connecting portion. A portion of the isolation portion extends into the insulating cover, and another portion is exposed outside the insulating cover. The connecting portion extends from one end of the isolation portion exposed outside the insulating cover in a direction perpendicular to the isolation portion and is fixedly connected to the connecting portion.

[0017] In one embodiment, the insulating cover has a through hole at the closed end for inserting a stationary contact. The through hole communicates with the inner cavity of the insulating cover. The top wall of the inner cavity of the insulating cover has at least one first grid and / or at least one second grid. The first grid surrounds the through hole, and the second grid is disposed between the through hole and the side wall of the insulating cover and is parallel to the side wall of the insulating cover.

[0018] According to another aspect of this application, a relay is provided, comprising:

[0019] As described in any of the above embodiments, the arc-extinguishing structure has a stationary contact on its insulating cover, one end of which is exposed outside the closed end, and the other end extends from the closed end into the inner cavity of the insulating cover.

[0020] A moving contact module is connected to the arc-extinguishing structure. The moving contact module has a moving contact piece that is movably located on the side of the magnetic plate facing the insulating cover, so as to be able to contact or detach from the stationary contact.

[0021] The aforementioned arc-extinguishing structure and relay, by incorporating an insulating plate within the arc-extinguishing structure, with a portion of the insulating plate extending into the insulating cover from the opening and closely adhering to the inner wall of the insulating cover, allows the insulating plate to shield the inner wall of the insulating cover. Therefore, when the internal contacts of the relay are ablated by an electric arc, generating splashed metal particles, these particles are shielded by the insulating plate and prevented from splashing onto the inner wall of the insulating cover. This reduces contamination of the insulating cover by metal particles, thus preventing the stationary contacts from forming a low-insulation circuit through the insulating cover, which could lead to relay breakdown and failure. Consequently, the durability of the relay is improved. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the appearance of a relay provided in one embodiment of this application.

[0023] Figure 2 An exploded view of the arc-extinguishing structure in a relay provided in an embodiment of this application.

[0024] Figure 3 This is a cross-sectional view of the arc-extinguishing structure in a relay provided in an embodiment of this application.

[0025] Figure 4 This is a schematic diagram of the insulating cover in an arc-extinguishing structure provided in an embodiment of this application.

[0026] Figure 5 for Figure 3 An enlarged schematic diagram of region A in the middle.

[0027] Figure 6 for Figure 3 A magnified view of region B in the middle.

[0028] Figure 7 for Figure 6 A magnified view of region C in the middle.

[0029] Figure 8 for Figure 6 An enlarged schematic diagram of another embodiment of region C.

[0030] Figure 9 This is a schematic diagram showing an insulating plate directly connected to a magnetic plate according to an embodiment of this application.

[0031] Figure 10 This is a schematic diagram of an insulating plate connected to a magnetic plate via a metal connector, according to an embodiment of this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 10. Relay; 100. Housing; 200. Arc extinguishing structure; 210. Insulating cover; 210a. Closed end; 210b. Open end; 211. Through hole; 212. First grid; 213. Second grid; 214. Inner barrier area; 215. Outer barrier area; 220. Magnetic plate; 230. Insulating plate; 230a. First surface; 230b. Second surface; 230c. Clean area; 230d. Gap; 231. Isolation part; 232. Connection part; 233. First isolation rib; 234. Second isolation rib; 240. Frame piece; 241. Parallel section; 250. Metal connector; 300. Stationary contact; 50. Central axis. 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] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] This application provides an arc-extinguishing structure for a relay and a relay including the arc-extinguishing structure. The relay is used in an automatic control circuit and plays a role in automatic adjustment, safety protection, and circuit switching. For example, it can be used to connect the load power supply and the load, control the on / off state of the circuit between the load power supply and the load, thereby playing a role in protecting the load through circuit switching and automatic adjustment, and preventing the load from being damaged by excessive current.

[0041] The following description uses a high-voltage DC relay used in an electric vehicle charging station as an example to illustrate the structure of the relay and its arc-extinguishing structure provided in this application. It is understood that the relay provided in this application can be any type of relay used in other fields, and is not limited to a high-voltage DC relay used in electric vehicle charging stations; there are no particular limitations in this regard.

[0042] See Figure 1 and Figure 2 , Figure 1 A schematic diagram of the appearance of a relay 10 according to an embodiment of this application is shown. The relay 10 provided in one embodiment of this application includes a housing 100, an arc-extinguishing structure 200, and a moving contact module. Both the arc-extinguishing structure 200 and the moving contact module are disposed within the housing 100. The arc-extinguishing structure 200 includes an insulating cover 210, on which a stationary contact 300 is provided. One end of the stationary contact 300 is exposed outside the insulating cover 210, and the other end extends into the insulating cover 210. In the embodiment shown in the figure, there are two stationary contacts 300, one for connecting to the load power supply and the other for connecting to the load (e.g., an automobile). The moving contact module has a moving contact piece that can move relative to the stationary contact 300 to contact or disengage from the end of the stationary contact 300 extending into the insulating cover 210, thereby controlling the on / off state of the load power supply and the load circuit.

[0043] As described in the background section, when the relay 10 operates, especially during the circuit disconnection process, the current between the contacts is suddenly interrupted, generating an electric arc. This arc is caused by the sudden change in the coil current when the relay 10 coil is de-energized, resulting in a high self-induced electromotive force in the coil, which in turn generates an electric spark between the contacts. Therefore, the insulating cover 210 can isolate the electric arc generated by the relay 10 during operation from the external environment and suppress the generation and spread of the arc, thereby ensuring the safe operation of the circuit and improving the lifespan of the relay 10.

[0044] Specifically, such as Figure 2 and Figure 3 As shown, the insulating cover 210 has a square shell structure with a closed end 210a and an open end 210b arranged opposite each other along an axial direction (X direction shown in the figure) defined by a central axis 50. The arc extinguishing structure 200 also includes a magnetic plate 220 and an insulating plate 230. The magnetic plate 220 is spaced apart from the open end 210b of the insulating cover 210 along the aforementioned axial direction, and the magnetic plate 220 is connected to the end face of the open end 210b through an annular metal frame 240. In the embodiment shown in the figure, there are two insulating plates 230, which are symmetrically spaced apart along the Y direction in the figure. A portion of each insulating plate 230 extends into the insulating cover 210 from the open end 210b and is close to the inner sidewall of the insulating cover 210. The portion of each insulating plate 230 exposed in the insulating cover 210 is connected to at least one of the end face of the open end 210b, the frame 240, and the magnetic plate 220. Alternatively, the insulating plate 230 can also be a ring-shaped structure that extends into the insulating cover 210, and the specific design can be matched according to the structure of the insulating cover 210.

[0045] Regarding the function of the magnetic plate 220, on the one hand, the magnetic plate 220 provides an installation platform to facilitate the installation of the insulating cover 210. On the other hand, the magnetic plate 220 is made of iron material, which allows the magnetic plate 220 to form a closed magnetic circuit with other magnetic components when the coil is energized, so as to conduct the generated magnetism and generate magnetic force to attract the moving contact piece, thereby preventing the moving contact piece from accidentally detaching from the stationary contact 300 when it comes into contact.

[0046] As described in the background art, when an electric arc is generated, the internal contacts (i.e., stationary contacts 300) are easily burned by the electric arc, producing metal particles. After the contacts are burned by the electric arc, the metal particles may splash and contaminate the inner wall of the insulating cover 210, causing the originally insulating insulating cover 210 to be contaminated, thereby forming an insulation short circuit and causing the insulation path of the insulating cover 210 to be "broken down".

[0047] It's important to explain here that "breakdown" refers to the loss of insulation capacity of electrical equipment's insulating material under certain conditions, allowing current to flow freely and potentially causing short circuits or fires. Specifically for relay 10, when an electric arc occurs, leakage current is generated. This leakage current creeps along the insulating material. When the insulation material breaks down, the previously insulated parts are no longer insulating, allowing the leakage current to flow freely. This reduces the creepage distance of the leakage current, consequently affecting circuit safety and the lifespan of relay 10.

[0048] Therefore, by setting the insulating plate 230, the inner wall of the insulating cover 210 can be shielded. When the internal contacts of the relay 10 are burned by the electric arc and generate splashing metal particles, the metal particles can be shielded by the insulating plate 230 and will not splash onto the inner wall of the insulating cover 210.

[0049] In the embodiments of this application, the insulating cover 210 and the insulating plate 230 can be made of ceramic or plastic, but are not limited to these, as long as they are made of insulating materials. However, since ceramic has better insulating properties than plastic and can play a role in extinguishing arcs to a certain extent, it is a better implementation method to use ceramic as the material for the insulating cover 210 and the insulating plate 230.

[0050] Based on this, in a preferred embodiment, such as Figure 4 As shown, the insulating cover 210 has a through hole 211 at the closed end 210a for inserting the stationary contact 300. The through hole 211 connects to the inner cavity of the insulating cover 210. The top wall of the inner cavity of the insulating cover 210 has a first grid 212 and a second grid 213. The first grid 212 is annular and surrounds the central axis 50 of the through hole 211. The second grid 213 is a straight strip between the through hole 211 and the side wall of the insulating cover 210, and is parallel to the side wall of the insulating cover 210.

[0051] It can be seen that by setting the first grid 212 and the second grid 213 at a position close to the stationary contact 300, the generated splashing metal particles can be blocked at the source, preventing the metal particles from splashing onto the side wall of the insulating cover 210. Combined with... Figure 5As shown, it can also be seen that an inner isolation zone near the through hole 211 and an outer barrier zone 215 away from the through hole 211 are formed between the first grid 212 and the second grid 213, and between the second grid 213 and the inner cavity sidewall of the insulating cover 210. Splashed metal particles are blocked by these layers and preferentially fall into the inner barrier zone 214, thereby further preventing the sidewall of the insulating cover 210 from being contaminated by metal particles. Furthermore, because two or more barrier zones are formed, the top wall of the insulating cover 210 has a bent and meandering structure, which can extend the creepage distance and allow the leakage current to be gradually dissipated during the creepage process, thereby improving the insulation effect.

[0052] More preferably, the first grid 212 and the second grid 213 can each have multiple first grids 212 arranged at intervals, and the multiple second grids 213 are also arranged at intervals, so that more layers of barrier areas can be formed, and the creepage distance can be further increased to further improve the insulation effect.

[0053] In other embodiments, the first grating 212 and the second grating 213 can also be configured as a staggered structure, i.e., as shown in the figure. Figure 5 As shown, the vertical dimension of the first grid 212 is larger than that of the second grid 213. This structure allows the first grid 212 to directly block most of the splashing metal particles, providing better insulation for products requiring high voltage, high current, and few interruptions. Alternatively, the vertical dimension of the first grid 212 can be smaller than that of the second grid 213. For products requiring low voltage, low current, and multiple interruptions, fewer metal particles are generated. Therefore, even though the vertical dimension of the first grid 212 is smaller, it can still block most of the metal particles, thus providing good insulation as well. Furthermore, because the vertical dimension of the first grid 212 is smaller, there is more space inside the insulating cover 210 to elongate the arc, which is more conducive to arc extinguishing.

[0054] It is understood that in other embodiments, only the first grating 212 or only the second grating 213 may be provided, as needed.

[0055] Furthermore, in some embodiments, the structure of the insulating plate 230 can be improved to extend the creepage distance. For example, in one embodiment, such as... Figure 6As shown, the insulating plate 230 has a first surface 230a and a second surface 230b on the side facing the inner wall of the insulating cover 210. The first surface 230a and the second surface 230b are connected sequentially from the open end 210b to the closed end 210a. The first surface 230a is attached to the inner wall of the insulating cover 210, and the second surface 230b is inclined towards the central axis 50, so that the second surface 230b and the inner wall of the insulating cover 210 form a roughly V-shaped clean area 230c. It is easy to see that because the first surface 230a is attached to the inner wall of the insulating cover 210, the leakage current, during creepage, will not flow directly down the inner wall of the insulating cover 210 in a straight line to the position of the moving contact module, but can only creep along the bent path formed by the V-shaped surface of the clean area 230c.

[0056] In another embodiment, the second surface 230b may also be parallel to the first surface 230a and spaced a certain distance from the inner cavity sidewall of the insulating cover 210, so that the second surface 230b and the inner cavity sidewall of the insulating cover 210 can form a clean area 230c.

[0057] Based on this, as an optional embodiment, combined with Figure 7 As shown, the insulating plate 230 includes an isolation portion 231 and a connecting portion 232. The isolation portion 231 extends into the insulating cover 210, and another portion is exposed outside the insulating cover 210. A first surface 230a and a second surface 230b are formed on the isolation portion 231. One end of the connecting portion 232 is connected to the portion of the isolation portion 231 exposed outside the insulating cover 210, and the other end is connected to the end face of the frame piece 240 or the opening end 210b, so that the insulating plate 230 is suspended relative to the magnetic plate 220.

[0058] For example Figure 7 In the embodiment shown, the connecting portion 232 is connected to the frame piece 240, while Figure 8 In the embodiment shown, the connecting part 232 is connected to the end face of the opening end 210b of the insulating cover 210. In all the above embodiments, the insulating plate 230 can be suspended relative to the magnetic plate 220. The advantage of the insulating plate 230 being suspended relative to the magnetic plate 220 is that the insulating plate 230 is not directly connected to the magnetic plate 220. Therefore, before the leakage current reaches the magnetic plate 220 during creepage, it will first creep along the bottom surface of the connecting part 232, and then reach the magnetic plate 220 through the frame 240. It will not flow directly from the insulating plate 230 to the magnetic plate 220 along a straight path, thereby extending the creepage distance.

[0059] Preferably, based on the above embodiment, the insulating plate 230 further includes a first insulating rib 233 connected to the connecting portion 232. The first insulating rib 233 protrudes from the connecting portion 232 toward the end face of the opening end 210b and abuts against the end face of the frame piece 240 or the opening end 210b, so that a gap 230d is formed between the end face of the connecting portion 232 and the end face of the opening end 210b. In this way, before the leakage current creeps along the bottom surface of the connecting portion 232 to the frame piece 240, it will also creep through the first insulating rib 233 and the surface forming the gap 230d before reaching the frame piece 240, thereby further increasing the creepage distance.

[0060] To facilitate connection with the first isolation rib 233, Figure 7 In the embodiment shown, the frame piece 240 is bent and extended along the axial direction defined by the central axis 50, such that the frame piece 240 includes at least one parallel segment 241 parallel to the end face of the opening end 210b, and the first isolation rib 233 abuts against the parallel segment 241, thereby making it easy for the first isolation rib 233 to be connected to the frame piece 240 by brazing or bonding, or the first isolation rib 233 can also be directly connected to the end face of the opening end 210b of the insulating cover 210 by brazing or bonding.

[0061] See Figure 8 A second isolation rib 234 may also be provided on the connecting part 232. The second isolation rib 234 protrudes from the connecting part 232 toward the end face away from the opening end 210b. The purpose of providing the second isolation rib 234 is also to form a meandering curved path on the surface of the insulating plate 230 to increase the creepage distance. This will not be elaborated further here.

[0062] Additionally, as an alternative embodiment, such as Figure 9 and Figure 10 As shown, the insulating plate 230 can also be directly connected to the magnetic plate 220, for example... Figure 10 As shown, the bottom surface of the connecting portion 232 of the insulating plate 230 is flat, allowing the connecting portion 232 to be attached to the magnetic plate 220 and connected to the magnetic plate 220 by means of riveting or other fixing methods. This connection method is highly reproducible and can greatly simplify the manufacturing process cost of fixing the insulating plate 230. At the same time, the top surface of the connecting portion 232 of the insulating plate 230 is provided with a first isolation rib 233.

[0063] As another alternative embodiment, such as Figure 10As shown, the insulating plate 230 can also be connected to the magnetic plate 220 via a metal connector 250. Specifically, the metal connector 250 is connected to the magnetic plate 220 by riveting or welding, while the insulating plate 230 is connected to the metal connector 250 by welding or bonding. This eliminates the need for the insulating plate 230 to be directly connected to the magnetic plate 220. Therefore, when the insulating plate 230 is made of ceramic material, direct riveting can avoid damaging the ceramic. It is clear that whether the insulating plate 230 is connected to the magnetic plate 220 via the metal connector 250 or directly via riveting, the insulating plate 230 can be securely fixed, ensuring its stability and durability.

[0064] Therefore, the arc-extinguishing structure 200 for relay 10 provided in this application effectively prevents metal particles from accumulating and splashing over a large area inside relay 10 by taking measures such as isolating metal particles and extending the creepage distance. This avoids insulation failure caused by metal particles and also effectively reduces the risk of creepage discharge in an environment contaminated by metal particles. All of these measures are beneficial to improving the insulation performance of relay 10 and enhancing its safety and stability.

[0065] 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.

[0066] 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 arc quenching structure for a relay, characterized by, include: An insulating cover having a closed end and an open end, the closed end and the open end being disposed opposite each other in an axial direction defined by a central axis; A magnetic guide plate is provided at intervals from the opening end of the insulating cover along the axial direction, and the magnetic guide plate is connected to the end face of the opening end through a frame plate; An insulating plate, a portion of which extends from the open end into the insulating cover and is disposed close to the inner cavity sidewall of the insulating cover, the portion of the insulating plate exposed outside the insulating cover being connected to at least one of the end face of the open end, the frame plate, and the magnetic conductive plate.

2. The quenching structure of claim 1, wherein The insulating plate has a first surface and a second surface on the side of the inner cavity sidewall facing the insulating cover, and the first surface and the second surface are connected in sequence from the open end to the closed end. The first surface is attached to the inner cavity sidewall of the insulating cover, and the second surface is inclined toward the central axis or parallel to the first surface, so that the second surface and the inner cavity sidewall of the insulating cover form a clean area.

3. The arc extinguishing structure according to claim 1, characterized in that The insulating plate includes an isolation portion and a connecting portion. A portion of the isolation portion extends into the insulating cover, while another portion is exposed outside the insulating cover. One end of the connecting portion is connected to the portion of the isolation portion exposed outside the insulating cover, and the other end is connected to the end face of the frame or the opening end, so that the insulating plate is suspended relative to the magnetic conductive plate.

4. The quenching structure of claim 3, wherein The insulating plate further includes a first insulating rib connected to the connecting portion. The end face of the first insulating rib facing the opening end protrudes from the connecting portion and abuts against the frame or the end face of the opening end, so that a gap is formed between the connecting portion and the end face of the opening end.

5. The arc extinguishing structure according to claim 4, characterized in that The frame is bent and extended along the axial direction such that the frame includes at least one parallel segment parallel to the end face of the opening end, and the first isolation rib abuts against the parallel segment.

6. The arc-extinguishing structure according to any one of claims 3-5, characterized in that, The insulating plate further includes a second isolation rib connected to the connecting portion, the second isolation rib protruding from the connecting portion toward the end face away from the opening end.

7. The arc extinguishing structure of claim 1, wherein A metal connector is connected to the magnetic plate, and an insulating plate is connected to the end of the metal connector away from the magnetic plate, so that the insulating plate is connected to the magnetic plate through the metal connector.

8. The arc extinguishing structure of claim 1, wherein The insulating plate includes an isolation portion and a connecting portion. A portion of the isolation portion extends into the insulating cover, and another portion is exposed outside the insulating cover. The connecting portion extends from the end of the isolation portion exposed outside the insulating cover in a direction perpendicular to the isolation portion and is fixedly connected to the connecting portion.

9. The arc extinguishing structure of claim 1, wherein The insulating cover has a through hole at the closed end for inserting a stationary contact. The through hole connects to the inner cavity of the insulating cover. The top wall of the inner cavity of the insulating cover has at least one first grid and / or at least one second grid. The first grid surrounds the through hole, and the second grid is disposed between the through hole and the side wall of the insulating cover and is parallel to the side wall of the insulating cover.

10. A relay characterized by comprising: include: The arc-extinguishing structure as described in any one of claims 1-9 is provided with a stationary contact on the insulating cover of the arc-extinguishing structure, one end of the stationary contact being exposed outside the closed end, and the other end extending from the closed end into the inner cavity of the insulating cover; A moving contact module is connected to the arc-extinguishing structure. The moving contact module has a moving contact piece that is movably located on the side of the magnetic plate facing the insulating cover, so as to be able to contact or detach from the stationary contact.

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