Arc extinguishing structure for relays and relays

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, which are arranged opposite to each other in an axial direction defined by a central axis. The magnetic plate is spaced apart from the open end of the insulating cover and is connected to the end face of the open end by a frame. A portion of the insulating plate extends from the open end into the insulating cover. The height dimension of the frame in the vertical direction extending from the central axis is greater than or equal to 1 / 2 the height dimension of the insulating plate in the vertical direction. This allows for a corresponding reduction in the height dimension of the insulating cover in the vertical direction, thereby reducing the pressure required for die-casting the insulating cover and eliminating the need for a high-pressure die-casting machine, thus reducing the manufacturing cost of the insulating cover.

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] When a relay operates, especially during circuit disconnection, the current between the contacts is suddenly interrupted, generating an electric arc. Therefore, an insulating cover is necessary to isolate the arc generated during relay operation from the external environment and to suppress its generation and spread, ensuring safe circuit operation. To ensure complete isolation, the insulating cover is typically positioned close to the lower magnetic plate in the height direction, resulting in a relatively large dimension. However, in existing relays, the insulating cover is mostly die-cast from ceramic material. A larger height requires greater die-casting pressure, necessitating a higher molding machine pressure, which significantly increases manufacturing costs and hinders mass production of relays. Utility Model Content

[0004] Therefore, it is necessary to address the problem that the existing relay insulation cover has a large dimension in the height direction, resulting in high manufacturing cost of the insulation cover, by providing an arc extinguishing structure for the relay 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, one end of which extends into the insulating cover from the opening end, and the other end of which is connected to the magnetic plate; the height dimension of the frame piece in the vertical direction extending from the central axis is greater than or equal to 1 / 2 the height dimension of the insulating plate in the vertical direction.

[0009] In one embodiment, the insulating cover has a through hole at the closed end that communicates with its own inner cavity. The top wall of the inner cavity has a baffle that is parallel to one side wall of the inner cavity. The baffle is located between the through hole and the side wall of the inner cavity, and a gap is formed between the baffle and the side wall of the inner cavity.

[0010] In one embodiment, the end of the insulating plate away from the magnetic plate is inserted into the gap.

[0011] In one embodiment, the side of the insulating plate facing the baffle is at least partially attached to the baffle.

[0012] In one embodiment, the insulating plate has a plurality of serrated ribs on one side facing the central axis, the plurality of serrated ribs being spaced apart in a vertical direction extending along the central axis, and each serrated rib extending in a horizontal direction perpendicular to the vertical direction.

[0013] In one embodiment, the baffle has a first surface and a second surface on the side facing the insulating plate or the insulating plate has a second surface on the side facing the baffle, and the first surface and the second surface are connected in sequence in the direction from the closed end to the open end;

[0014] The first surface is attached to the inner wall 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 side wall of the insulating plate facing the central axis form a creepage area.

[0015] In one embodiment, a partition fence is provided between the baffle and the sidewall of the inner cavity, and the partition fence is arranged parallel to the baffle to divide the gap into at least two clean zones.

[0016] In one embodiment, the insulating plate includes an isolation portion and a base. A portion of the isolation portion extends into the insulating cover, while another portion is exposed outside the insulating cover. One side of the base is connected to the end of the isolation portion exposed outside the insulating cover, and the opposite side is connected to the magnetic plate. A creepage barrier is provided on the side of the base connected to the isolation portion, and the creepage barrier protrudes along the edge of the base.

[0017] In one embodiment, the creepage barrier includes a first portion and a second portion connected to each other, the first portion extending from the edge of the base toward the opening end, and the second portion extending from the edge of the first portion toward a direction away from the isolation portion.

[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 the stationary contact is exposed outside the closed end, and the other end extends into the inner cavity of the insulating cover through a through hole opened in the closed end.

[0020] A moving contact module is connected to the arc-extinguishing structure. The moving contact module has a moving contact 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 for relays and the relay including the arc-extinguishing structure, by setting an insulating plate, with one end of the insulating plate extending into the insulating cover from the opening end of the insulating cover, and by increasing the vertical height of the frame piece (specifically, the vertical height of the frame piece is greater than or equal to the vertical height of the insulating plate), the vertical height of the insulating cover can be reduced accordingly. This reduces the pressure required for die-casting the insulating cover, thus eliminating the need for a large-tonnage high-pressure molding machine for pressing, thereby reducing the manufacturing cost of the insulating cover. 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 for Figure 3 Enlarged view of region A in the middle Figure 1 .

[0026] Figure 5 for Figure 3 Enlarged view of region A in the middle Figure 2 .

[0027] Figure 6 for Figure 3 Enlarged schematic diagram of region B in the middle.

[0028] Figure 7 This is a schematic diagram of the structure of an insulating plate provided in one embodiment of this application.

[0029] Figure 8 for Figure 6 A magnified view of region C in the middle.

[0030] Figure 9This is a schematic diagram of the structure of an insulating cover provided in an embodiment of this application.

[0031] Explanation of reference numerals in the attached figures:

[0032] 10. Relay; 100. Housing; 200. Arc extinguishing structure; 210. Insulating cover; 210a. Closed end; 210b. Open end; 210c. Gap; 211. Through hole; 212. Baffle; 212a. First surface; 212b. Second surface; 212c. Creepage zone; 213. Isolation fence; 214. Inner clean zone; 215. Outer clean zone; 220. Magnetic plate; 230. Insulating plate; 230a. Serrated rib; 231. Isolation part; 232. Base; 233. Creepage partition; 2331. First part; 2332. Second part; 240. Frame plate; 300. Stationary contact; 50. Central axis. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] This application provides a relay that is used in an automatic control circuit. The relay 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, and control the on / off state of the circuit between the load power supply and the load. This allows the relay to protect the load through circuit switching and automatic adjustment, preventing damage to the load due to excessive current.

[0040] 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 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.

[0041] See Figure 1 and Figure 2 , Figure 1A 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.

[0042] As is well known, when relay 10 operates, especially during the circuit disconnection process, an electric arc is generated when the current between the contacts is suddenly interrupted. This arc is caused by the sudden change in 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 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 relay 10.

[0043] 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. The two insulating plates 230 are symmetrically spaced apart along the Y direction (i.e., the length direction of the insulating cover 210) in the figure. A portion of each insulating plate 230 extends into the insulating cover 210 from the open end 210b and is arranged close to the inner sidewall of the insulating cover 210. The portion of each insulating plate 230 exposed outside the insulating cover 210 is connected to the magnetic plate 220. Of course, each insulating plate 230 can also be spaced apart along the width of the insulating cover 210, or the insulating plate 230 can be a ring-shaped structure extending into the insulating cover 210. The specific design can be matched according to the structure of the insulating cover 210.

[0044] 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 use magnetic force to attract the moving iron core connected to the moving contact piece through the push rod, thereby preventing the moving contact piece from accidentally detaching from the stationary contact 300 when it comes into contact.

[0045] 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 splashing metal particles may 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".

[0046] 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.

[0047] Therefore, by providing the insulating plate 230, the inner wall of the insulating cover 210 can be shielded. Thus, when the internal contacts of the relay 10 are burned by an electric arc and metal particles are generated, the metal particles can be shielded by the insulating plate 230 and will not splash onto the inner wall of the insulating cover 210. Therefore, the insulation capacity of the insulating cover 210 can be prevented from decreasing.

[0048] 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.

[0049] In a preferred embodiment, such as Figure 3As shown, the vertical height of the frame 240 is greater than or equal to half the vertical height of the insulating plate 230. It is easy to see that the height of both the frame 240 and the insulating plate 230 has been increased, which allows the vertical height of the insulating cover 210 to be reduced accordingly. This means that the pressure required for the insulating cover 210 during die casting is not very high, and therefore a high-pressure molding machine with a large tonnage is not needed for pressing, thereby reducing the production cost of the insulating cover 210.

[0050] More preferably, the insulating cover 210 has a through hole 211 at the closed end 210a that communicates with its own inner cavity. The top wall of the inner cavity has a baffle 212 that is parallel to one side wall of the inner cavity. The baffle 212 is located between the through hole 211 and the side wall of the inner cavity, and a gap 210c is formed between the baffle 212 and the side wall of the inner cavity.

[0051] It can be seen that by setting the baffle 212 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.

[0052] Based on this, such as Figure 4 As shown, in an improved embodiment, the end of the insulating plate 230 away from the magnetic plate 220 is inserted into the gap 210c. In this way, the insulating plate 230 and the baffle 212 form a double barrier, so that the splashed metal particles are blocked layer by layer and will not enter the space between the inner cavity sidewall of the insulating cover 210 and the insulating plate 230, thereby further preventing the inner cavity sidewall of the insulating cover 210 from being contaminated by metal particles.

[0053] Furthermore, the side of the insulating plate 230 facing the baffle 212 is at least partially attached to the baffle 212, so that the surface of the insulating plate 230 and the surface of the baffle 212 can form a bent creepage path. When the leakage current creeps, it will creep through the surface of the baffle 212 and the surface of the insulating plate 230 facing the central axis 50 in sequence, thereby extending the creepage distance and gradually dissipating the leakage current during the creepage process, so as to improve the insulation effect.

[0054] To further extend the creepage distance, improvements can be made to the above embodiments. For example, in one embodiment, such as... Figure 5As shown, the baffle 212 has a first surface 212a and a second surface 212b on the side facing the insulating plate 230. The first surface 212a and the second surface 212b are connected sequentially from the closed end 210a to the open end 210b. The first surface 212a is attached to the inner wall of the insulating cover 210, and the second surface 212b is inclined towards the central axis 50, so that the second surface 212b and the side wall of the insulating plate 230 facing the central axis 50 form an inverted V-shaped creepage area 212c. It is easy to understand that because the first surface 212a is attached to the baffle 212, 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 magnetic plate 220, but can only creep along the bent path formed by the inverted V-shaped surface of the creepage area 212c.

[0055] It should be noted that the second surface 212b is not limited to being inclined relative to the first surface 212a. As an alternative implementation, the second surface 212b can also be parallel to the first surface 212a and spaced a certain distance from the inner cavity sidewall of the insulating cover 210. This also allows the second surface 212b to form a creepage area 212c with the inner cavity sidewall of the insulating cover 210.

[0056] Furthermore, such as Figure 6 and Figure 7 As shown, as an alternative improved embodiment, the insulating plate 230 also has multiple serrated ribs 230a on the side facing the central axis 50. These serrated ribs 230a are spaced apart in a vertical direction extending along the central axis 50, and each serrated rib 230a extends in a horizontal direction perpendicular to the vertical direction (i.e., along the length or width direction of the insulating cover 210). In the embodiment shown, the serrated rib 230a extends along the width direction of the insulating cover 210. Thus, the surface of the insulating plate 230 facing the central axis 50 also forms a winding creepage path, further extending the creepage distance.

[0057] For the specific structure of the insulating board 230, please refer to Figure 7 and Figure 8 The insulating plate 230 includes an isolation portion 231 and a base 232. A portion of the isolation portion 231 extends into the insulating cover 210 and is disposed close to the inner cavity sidewall of the insulating cover 210, while the other portion is connected to one end of the isolation portion 231 exposed outside the insulating cover 210. One side of the base 232 is connected to one end of the isolation portion 231 exposed outside the insulating cover 210, and the opposite side is connected to the magnetic plate 220. A creepage barrier 233 is provided on the side of the base 232 connected to the isolation portion 231. The creepage barrier 233 is arranged in a ring shape protruding along the edge of the base 232.

[0058] Thus, through the above arrangement, not only can the insulating plate 230 be stably connected to the magnetic plate 220, but the surface of the insulating plate 230 also forms more bends and meanders for creepage. When the leakage current creeps along the surface of the insulating plate 230, it first creeps along the surface of the insulating plate 230, and then bends and flows along the surface of the base 232, thereby further extending the creepage distance.

[0059] Regarding the specific structure of the creepage barrier 233, as follows: Figure 8 As shown, the creepage barrier 233 has an inverted L-shaped cross section, including a first part 2331 and a second part 2332 that are connected to each other. The first part 2331 extends from the edge of the base 232 toward the opening end 210b, and the second part 2332 extends from the edge of the first part 2331 toward the direction away from the isolation part 231.

[0060] It is understood that the structure of the creepage barrier 233 is not limited to the structure shown in the embodiment in the figure, and can be any irregular cross-section, and there is no limitation thereto.

[0061] It should be emphasized that extending the creepage distance is not limited to designing improvements to the structure of the insulating plate 230; it can also be achieved by designing improvements to the inner cavity top wall of the insulating cover 210. For example... Figure 9 As shown, there is an isolation grid 213 arranged parallel to the baffle 212 between the baffle 212 and the side wall of the inner cavity. The isolation grid 213 divides the gap 210c into two clean areas, one of which is the inner clean area 214, and the other is the outer clean area 215. Of course, the number of isolation grids 213 is not limited, and there can be more of them to form more clean areas.

[0062] Thus, by setting up the isolation barrier 213, splashed metal particles will preferentially fall into the inner clean area 214 and not into the outer clean area 215, thereby preventing the sidewall of the insulating cover 210 from being contaminated by metal particles. Furthermore, because there are two or more clean areas, the top wall of the insulating cover 210 has a bent and meandering structure, which can extend the creepage distance. Regardless of whether the end of the insulating plate 230 away from the magnetic plate 220 extends into the gap 210c formed between the baffle 212 and the inner cavity sidewall of the insulating cover 210, or whether the side of the insulating plate 230 facing the central axis 50 is in contact with the baffle 212, the leakage current will not creep along a straight path during the creepage process, thus improving the insulation effect.

[0063] Additionally, it is understood that in other embodiments, the baffle 212 and the isolation barrier 213 can also be designed as a staggered structure, with the vertical dimension of the baffle 212 being larger than that of the isolation barrier 213. This structure allows the baffle 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 baffle 212 can be smaller than that of the isolation barrier 213. For products requiring low voltage, low current, and multiple interruptions, fewer metal particles are generated. Therefore, although the vertical dimension of the baffle 212 is smaller, it can still block most of the metal particles, thus providing better insulation. Furthermore, because the vertical dimension of the first barrier is smaller, there is more space inside the insulating cover 210 to elongate the arc, which is more conducive to arc extinguishing.

[0064] Therefore, the arc-extinguishing structure 200 for the relay 10 provided in this application reduces the vertical height of the insulating cover 210 by increasing the height of the frame 240, thereby reducing the production cost of the insulating cover 210 to single digits. Moreover, by adopting measures such as isolating metal particles and extending the creepage distance, it effectively prevents metal particles from accumulating and splashing over a large area inside the relay 10, thus avoiding insulation failure caused by metal particles. It effectively reduces the risk of creepage discharge in an environment contaminated with metal particles, which is beneficial to improving the insulation performance of the relay 10 and enhancing the safety and stability of the relay 10.

[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, one end of which extends into the insulating cover from the opening end, and the other end of which is connected to the magnetic plate; the height dimension of the frame piece in the vertical direction extending from the central axis is greater than or equal to 1 / 2 the height dimension of the insulating plate in the vertical direction.

2. The quenching structure of claim 1, wherein The insulating cover has a through hole at the closed end that connects to its own inner cavity. The top wall of the inner cavity has a baffle that is parallel to one side wall of the inner cavity. The baffle is located between the through hole and the side wall of the inner cavity, and a gap is formed between the baffle and the side wall of the inner cavity.

3. The quenching structure of claim 2, wherein The end of the insulating plate away from the magnetic plate is inserted into the gap.

4. The quenching structure of claim 3, wherein The insulating plate is at least partially attached to the baffle on the side facing the baffle.

5. The arc extinguishing structure according to claim 4, characterized in that The insulating plate has multiple serrated ribs on one side facing the central axis. The multiple serrated ribs are spaced apart in a vertical direction extending along the central axis, and each serrated rib extends in a horizontal direction perpendicular to the vertical direction.

6. The arc-extinguishing structure according to claim 4 or 5, characterized in that, The baffle has a first surface and a second surface on the side facing the insulating plate or the insulating plate has a second surface on the side facing the baffle, and the first surface and the second surface are connected in sequence in the direction from the closed end to the open end; The first surface is attached to the inner wall 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 side wall of the insulating plate facing the central axis form a creepage area.

7. The arc extinguishing structure of claim 2, wherein The baffle and the side wall of the inner cavity have an isolation grid arranged parallel to the baffle, which divides the gap into at least two clean areas.

8. The arc extinguishing structure of claim 1, wherein The insulating plate includes an isolation part and a base. A portion of the isolation part extends into the insulating cover, and another portion is exposed outside the insulating cover. One side of the base is connected to the end of the isolation part exposed outside the insulating cover, and the opposite side is connected to the magnetic plate. A creepage barrier is provided on the side of the base connected to the isolation part, and the creepage barrier protrudes along the edge of the base.

9. The arc extinguishing structure of claim 8, wherein The creepage barrier includes a first part and a second part that are connected to each other. The first part extends from the edge of the base toward the opening end, and the second part extends from the edge of the first part toward a direction away from the isolation portion.

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 into the inner cavity of the insulating cover through a through hole opened in the closed end; A moving contact module is connected to the arc-extinguishing structure. The moving contact module has a moving contact 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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