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. The magnetic plate is connected to the end face of the open end via a frame. The insulating plate is disposed close to the inner cavity sidewall of the insulating cover and is connected to the magnetic plate via an elastic element, such that at least a portion of the outer wall of the insulating plate can be attached to the inner sidewall of the insulating cover by the elastic force generated by the elastic element. In this way, the inner wall of the insulating plate and the inner cavity sidewall of the insulating cover can form a bent creepage path. The leakage current generated by the arc will creep along the bent creepage path, thus extending the creepage distance. Furthermore, it prevents the formation of a large gap between the inner cavity sidewall of the insulating cover and the insulating plate due to processing defects, thus preventing splashed metal particles from entering the gap and contaminating the inner cavity sidewall of the insulating cover, thereby reducing the insulating capacity 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 essentially acts as an "automatic switch" by using a smaller current to control a larger current. Therefore, it plays a role in automatic adjustment, safety protection, and circuit switching in circuits, and is widely used in fields such as new energy vehicles. 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 the cooperation of two stationary contacts and one moving spring. Depending on the actual application in the vehicle, the contacts need to connect, disconnect, and switch under load to achieve the "switching" function.

[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 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 ablated by the arc, producing flying metal particles. To prevent the inner wall of the insulating cover from being contaminated by these particles and causing an insulation short circuit, an insulating plate is usually installed at the bottom of the insulating cover to shield its inner wall. However, since both the insulating cover and the insulating plate are usually made of ceramic, manufacturing defects are unavoidable. This prevents the insulating plate from fitting tightly against the inner wall of the insulating cover cavity. Consequently, the creepage distance of the leakage current generated by the arc is reduced, and the flying metal particles can easily enter the gap between the insulating cover and the insulating plate, contaminating the originally insulating cover and causing an insulation short circuit, thus reducing its insulation capacity. Utility Model Content

[0004] Therefore, it is necessary to address the problem that in existing relays, a large gap can easily form between the insulating cover and the insulating plate due to processing errors, resulting in a reduced creepage distance or the easy entry of splashed metal particles into the gap and contamination of the insulating cover, thereby reducing the insulating capacity of the insulating cover. To solve the above-mentioned problems, an arc-extinguishing structure for a relay and a relay including the arc-extinguishing structure are provided.

[0005] According to one aspect of this application, 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, at least a portion of which extends from the open end into the insulating cover and is disposed close to the inner sidewall of the insulating cover, and the insulating plate is connected to the magnetic plate by an elastic member configured to provide an elastic force such that at least a portion of the outer sidewall of the insulating plate can be attached to the inner sidewall of the insulating cover by means of the elastic force.

[0009] In one embodiment, the insulating plate has a first surface and a second surface on the side facing the sidewall of 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 sidewall of the insulating cover, and the second surface and the sidewall of the insulating cover form a clean area that communicates with the internal space of the insulating cover.

[0011] In one embodiment, the second surface is a plane, and the second surface is inclined toward the central axis or parallel to the first surface, so that the second surface and the sidewall of the insulating cover form a clean area.

[0012] In one embodiment, the insulating plate includes an isolation portion and a connecting portion, a portion of the isolation portion extending into the insulating cover and another portion 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 elastic member, so that the insulating plate is suspended relative to the magnetic plate.

[0013] In one embodiment, the elastic member includes a first connecting portion, a first bent portion, a second bent portion, and a second connecting portion integrally connected in sequence. The first connecting portion is connected to the magnetic plate. The first bent portion is bent relative to the first connecting portion toward the closed end. The second bent portion is bent relative to the first bent portion toward the open end and abuts against the inner sidewall of the insulating plate. The second connecting portion is bent relative to the second bent portion and connected to the insulating plate.

[0014] In one embodiment, the second bending portion includes a first elastic portion and a second elastic portion, one end of the first elastic portion is integrally connected to one end of the second elastic portion, the end of the first elastic portion away from the second elastic portion is connected to the first bending portion, and the end of the second elastic portion away from the first elastic portion is connected to the second connecting portion.

[0015] The first elastic portion is inclined toward the direction of the insulating plate relative to the first bent portion, and the second elastic portion is inclined away from the insulating plate relative to the first elastic portion, so that a protrusion is formed at the position where the first elastic portion and the second elastic portion are connected, and the protrusion abuts against the inner sidewall of the insulating plate.

[0016] In one embodiment, the magnetic plate is provided with an insulating seat, and one end of the elastic member is connected to the insulating seat.

[0017] In one embodiment, the insulating plate is divided into several sub-insulating plates, which are arranged sequentially along the length or width of the insulating cover. A gap is formed between two adjacent sub-insulating plates, and each sub-insulating plate abuts against the elastic member.

[0018] In one embodiment, the end of the sub-insulating plate has a misaligned portion, and the misaligned portion of any sub-insulating plate is spaced apart from the misaligned portion of the adjacent sub-insulating plate in the thickness direction of the insulating plate, so that the two adjacent sub-insulating plates are misaligned.

[0019] 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.

[0020] According to another aspect of this application, a relay is provided, comprising:

[0021] 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.

[0022] 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.

[0023] The aforementioned arc-extinguishing structure for a relay and the relay including the arc-extinguishing structure, by connecting the insulating plate to the magnetic plate via an elastic element, allows at least a portion of the outer sidewall of the insulating plate to adhere to the inner sidewall of the insulating cover by the elastic force provided by the elastic element. In this way, on the one hand, the inner wall of the insulating plate and the inner cavity sidewall of the insulating cover can form a bent creepage path, preventing the leakage current generated by the arc from creeping directly along the straight path of the inner wall of the insulating cover, but instead creeping along the aforementioned bent creepage path, thus extending the creepage distance; on the other hand, it can, to a certain extent, prevent the formation of a large gap between the inner cavity sidewall of the insulating cover and the insulating plate due to processing defects, thus preventing splashed metal particles from entering the gap and contaminating the inner cavity sidewall of the insulating cover, thereby preventing a decrease in the insulating capacity of the insulating cover. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the appearance of a relay provided in one embodiment of this application.

[0025] Figure 2 An exploded view of the arc-extinguishing structure in a relay provided in an embodiment of this application.

[0026] Figure 3 This is a cross-sectional view of the arc-extinguishing structure in a relay provided in an embodiment of this application.

[0027] Figure 4 This is a schematic diagram of the insulating cover in an arc-extinguishing structure provided in an embodiment of this application.

[0028] Figure 5 for Figure 3 An enlarged schematic diagram of region A in the middle.

[0029] Figure 6 for Figure 3 Enlarged schematic diagram of region B in the middle.

[0030] Figure 7 This is a top view of the arc-extinguishing structure in a relay provided in an embodiment of this application.

[0031] Figure 8 This is a schematic diagram of the structure of the insulating plate in a relay provided in an embodiment of this application.

[0032] Figure 9 This is a partial structural diagram of the insulating plate in a relay provided in an embodiment of this application.

[0033] Figure 10 for Figure 6 A magnified view of region C in the middle.

[0034] Figure 11 This is a schematic diagram of the structure of the elastic element in a relay provided in an embodiment of this application.

[0035] Figure 12 A schematic diagram of an insulating plate mounted on a magnetic plate in a relay provided in an embodiment of this application. Figure 1 .

[0036] Figure 13 A schematic diagram of an insulating plate mounted on a magnetic plate in a relay provided in an embodiment of this application. Figure 2 .

[0037] Explanation of reference numerals in the attached figures:

[0038] 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; 231. Sub-insulating plate; 2311. Misalignment part; 232. Isolation part; 233. Connecting part; 240. Frame piece; 250. Elastic element; 251. First connecting part; 252. First bending part; 253. Second bending part; 2531. First elastic part; 2532. Second elastic part; 254. Second connecting part; 260. Insulating base; 300. Stationary contact; 50. Central axis. Detailed Implementation

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] Specifically, such as Figure 2 and Figure 3As 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. 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.

[0050] 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.

[0051] 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".

[0052] 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.

[0053] Therefore, by setting 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 the 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.

[0054] 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.

[0055] 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 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.

[0056] 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 5 As shown, an inner barrier region 214 near the through hole 211 and an outer barrier region 215 away from the through hole 211 are formed between the first barrier 212 and the second barrier 213, and between the second barrier 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 region 214, minimizing the possibility of metal particles falling into the outer barrier region 215. This further prevents the sidewall of the insulating cover 210 from being contaminated by metal particles. Furthermore, because two or more barrier regions 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.

[0057] 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.

[0058] 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.

[0059] It is understood that in other embodiments, only the first grating 212 or only the second grating 213 may be provided, as needed.

[0060] 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 6 As 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. From the open end 210b towards the closed end 210a, the first surface 230a and the second surface 230b are connected sequentially. The first surface 230a is attached to the inner cavity sidewall of the insulating cover 210, and the second surface 230b forms a clean area communicating with the internal space of the insulating cover 210 with the sidewall of the insulating cover 210. It is easy to see that because the first surface 230a is attached to the inner cavity sidewall of the insulating cover 210, the leakage current, during creepage, does not flow directly down the inner cavity sidewall of the insulating cover 210 in a straight line to the moving contact, but only creeps along the bent path formed by the V-shaped surface of the clean area 230c, thereby increasing the creepage distance.

[0061] In one embodiment, the second surface 230b is a plane and is inclined toward the central axis, so that the second surface 230b and the inner cavity sidewall of the insulating cover 210 form a generally V-shaped clean area 230c.

[0062] In another embodiment, the second surface 230b is a plane, 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.

[0063] In other embodiments, the second surface 230b is a curved surface or an irregular plane.

[0064] However, it should be noted that since the insulating cover 210 and the insulating plate 230 are usually made of ceramic material, dimensional differences are unavoidable after molding. This means that the insulating plate 230 cannot be completely and tightly fitted to the inner wall of the cavity of the insulating cover 210. As a result, the creepage distance of the leakage current generated by the electric arc is reduced, and the splashed metal particles can easily enter the gap formed between the insulating cover 210 and the insulating plate 230, causing the originally insulating insulating cover 210 to be contaminated, thus forming an insulation short circuit, which in turn leads to a decrease in insulation capacity.

[0065] Therefore, to resolve this issue, please continue reading Figure 6 The applicant of this application conceived of providing an elastic element 250 between the insulating plate 230 and the magnetic plate 220, so that the insulating plate 230 is connected to the magnetic plate 220 through the elastic element 250. The elastic element 250 is used to provide elastic force. In this way, at least part of the outer sidewall of the insulating plate 230 can be attached to the inner sidewall of the insulating cover 210 by means of elastic force. This means that, on the one hand, the leakage current generated by the arc will not creep downward directly along the straight path of the inner wall of the insulating cover 210, but will creep along the surface of the V-shaped clean area 230c in a bending manner, thus extending the creepage distance; on the other hand, it can prevent the formation of a large gap between the inner cavity sidewall of the insulating cover 210 and the insulating plate 230 due to dimensional differences to a certain extent. Therefore, it can prevent splashed metal particles from entering the gap and contaminating the inner cavity sidewall of the insulating cover 210, thereby preventing the insulation capacity of the insulating cover 210 from decreasing.

[0066] Furthermore, in the embodiments of this application, such as Figure 7 As shown, viewed from above, the single insulating plate 230 is in the width direction of the insulating cover 210 (i.e., Figure 7 As shown in the Z direction, the insulating plate 230 has a certain length. Therefore, although the insulating plate 230 can at least partially adhere to the inner cavity sidewall of the insulating cover 210 due to the abutment of the elastic member 250, due to the existence of processing variations, it is still not possible to completely guarantee that all parts of the surface of the insulating plate 230 in the Z direction can adhere to the inner cavity sidewall of the insulating cover 210. In order to further eliminate the gap between the insulating plate 230 and the insulating cover 210, based on the above embodiment, as a further improvement, a single insulating plate 230 includes several sub-insulating plates 231, and the several sub-insulating plates 231 are along the length direction or width direction of the insulating cover 210 (i.e., along the...). Figure 7 The sub-insulating plates 231 are arranged sequentially in the Y or Z direction, with a gap between adjacent sub-insulating plates 231, and each sub-insulating plate 231 abuts against the elastic member 250.

[0067] In this way, each sub-insulating plate 231 can be individually adjusted in position under the elastic force provided by the elastic member 250. Therefore, even if there is a large gap between the insulating plate 230 and the inner cavity sidewall of the insulating cover 210, it can be flexibly adjusted to eliminate the gap between a certain sub-insulating plate 231 and the insulating cover 210.

[0068] In the embodiments of this application, such as Figure 8 As shown, each insulating plate 230 is divided into two sub-insulating plates 231. The two sub-insulating plates 231 belonging to a single insulating plate 230 are staggered in the width direction (or length direction) of the insulating cover 210, and each sub-insulating plate 231 is connected to the magnetic plate 220 by an elastic member 250. Specifically, in conjunction with... Figure 9 As shown, each sub-insulating plate 231 has a misaligned portion 2311 at the end near the adjacent sub-insulating plate 231. The thickness of the misaligned portion 2311 is slightly smaller than the size of the rest, so that the misaligned portions 2311 of any sub-insulating plate 231 are spaced apart in the thickness direction of the insulating plate 230, so that two adjacent sub-insulating plates 231 are misaligned in the width direction (or length direction) of the insulating cover 210.

[0069] With the above settings, as Figure 9 As shown, the misaligned portions 2311 of two adjacent sub-insulating plates 231 have gaps in both the thickness direction of the insulating plate 230 and the width direction of the insulating cover 210. Therefore, regardless of whether the insulating plate 230 is in the Y or Z direction in the figure, there is a gap between it and the inner cavity sidewall of the insulating cover 210. Each sub-insulating plate 231 can be adjusted in the Y or Z direction to eliminate the gap between the sub-insulating plate 231 and the inner cavity sidewall of the insulating cover 210, thereby better extending the creepage distance and completely preventing the insulation capacity of the insulating cover 210 from decreasing.

[0070] See Figure 10 In one embodiment, the elastic member 250 has a bent sheet-like structure, and the insulating plate 230 includes an isolation portion 232 and a connecting portion 233. A portion of the isolation portion 232 extends into the insulating cover 210, and another portion is exposed outside the insulating cover 210. One end of the connecting portion 233 is connected to the portion of the isolation portion 232 exposed outside the insulating cover 210, and the other end is connected to the elastic member 250, so that the insulating plate 230 is suspended relative to the magnetic plate 220.

[0071] The advantage of suspending the insulating plate 230 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 connection part 233, and then through the frame 240 to reach the magnetic plate 220. It will not flow directly from the insulating plate 230 to the magnetic plate 220 along a straight path, which can also extend the creepage distance.

[0072] In the specific structure of the elastic element 250, combined with Figure 10 and Figure 11 As shown, the elastic element 250 includes a first connecting portion 251, a first bending portion 252, a second bending portion 253, and a second connecting portion 254 that are integrally connected in sequence. The first connecting portion 251 is connected to the magnetic plate 220. The first bending portion 252 bends relative to the first connecting portion 251 toward the closed end 210a of the insulating cover 210. The second bending portion 253 bends relative to the first bending portion 252 toward the open end 210b of the insulating cover 210 and abuts against the inner sidewall (i.e., the sidewall facing the central axis) of the insulating portion in the insulating plate 230. The second connecting portion 254 bends relative to the second bending portion 253 and is connected to the insulating plate 230, specifically to the bottom surface of the connecting portion 233 in the insulating plate 230.

[0073] Thus, it is easy to see that the second bending portion 253 is connected to the first bending portion 252 at only one end. Therefore, when the second bending portion 253 abuts against the insulating plate 230, the second bending portion 253 can produce a recoverable deformation and a resettable displacement relative to the first bending portion 252, so that it can abut against the insulating plate 230 tightly, thereby allowing the insulating plate 230 to be tightly attached to the inner cavity sidewall of the insulating cover 210.

[0074] Preferably, the second bending portion 253 is also bent. Specifically, the second bending portion 253 includes a first elastic portion 2531 and a second elastic portion 2532. One end of the first elastic portion 2531 is integrally connected to one end of the second elastic portion 2532. The end of the first elastic portion 2531 away from the second elastic portion 2532 is connected to the first bending portion 252, and the end of the second elastic portion 2532 away from the first elastic portion 2531 is connected to the second connecting portion 254. The first elastic portion 2531 is inclined relative to the first bending portion 252 towards the direction closer to the insulating plate 230, and the second elastic portion 2532 is inclined relative to the first elastic portion 2531 towards the direction away from the insulating plate 230, so that a protrusion is formed at the position where the first elastic portion 2531 and the second elastic portion 2532 are connected, and the protrusion abuts against the inner sidewall of the insulating plate 230. By forming protrusions, the elastic element 250 can apply greater elastic force to the insulating plate 230, which is more conducive to the insulating plate 230 being firmly attached to the inner cavity sidewall of the insulating cover 210.

[0075] Furthermore, in one embodiment, such as Figure 12 As shown, the elastic element 250 is directly connected to the magnetic plate 220, for example, by riveting, bonding, or welding, thus eliminating the need to manufacture the magnetic plate 220 or the insulating plate 230 through injection molding, thereby reducing the difficulty of molding. In another embodiment, as... Figure 13 As shown, the magnetic plate 220 is provided with an insulating base 260 made of insulating material, and one end of the elastic member 250 (i.e., the first connecting part 251 of the elastic member 250) is connected to the insulating base 260. This can protect the elastic member 250 from excessive deformation when subjected to force, and also prevent splashed metal particles from contaminating the magnetic plate 220 when they fall on the elastic member 250. Therefore, it can prevent the breakdown path from passing through the elastic member 250. In other words, it can prevent leakage current from creeping directly downwards in the vertical direction.

[0076] 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.

[0077] 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.

[0078] 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, at least a portion of which extends from the open end into the insulating cover and is disposed close to the inner sidewall of the insulating cover, and the insulating plate is connected to the magnetic plate by an elastic member configured to provide an elastic force such that at least a portion of the outer sidewall of the insulating plate can be attached to the inner sidewall of the insulating cover by means of the elastic force.

2. The quenching structure of claim 1, wherein The insulating plate has a first surface and a second surface on the side wall 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 sidewall of the insulating cover, and the second surface and the sidewall of the insulating cover form a clean area that communicates with the internal space of the insulating cover.

3. The quenching structure of claim 2, wherein The second surface is a plane, and the second surface is inclined toward the central axis or parallel to the first surface.

4. 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, 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 elastic member, so that the insulating plate is suspended relative to the magnetic plate.

5. The arc extinguishing structure of claim 1, wherein The elastic element includes a first connecting portion, a first bending portion, a second bending portion, and a second connecting portion that are integrally connected in sequence. The first connecting portion is connected to the magnetic plate. The first bending portion bends relative to the first connecting portion toward the closed end. The second bending portion bends relative to the first bending portion toward the open end and abuts against the inner sidewall of the insulating plate. The second connecting portion bends relative to the second bending portion and is connected to the insulating plate.

6. The quenching structure of claim 5, wherein The second bending portion includes a first elastic portion and a second elastic portion. One end of the first elastic portion is integrally connected to one end of the second elastic portion. The end of the first elastic portion away from the second elastic portion is connected to the first bending portion. The end of the second elastic portion away from the first elastic portion is connected to the second connecting portion. The first elastic portion is inclined toward the direction of the insulating plate relative to the first bent portion, and the second elastic portion is inclined away from the insulating plate relative to the first elastic portion, so that a protrusion is formed at the position where the first elastic portion and the second elastic portion are connected, and the protrusion abuts against the inner sidewall of the insulating plate.

7. The arc extinguishing structure of claim 1, wherein The magnetic plate is provided with an insulating seat, and one end of the elastic element is connected to the insulating seat.

8. The arc extinguishing structure of claim 1, wherein The insulating plate is divided into several sub-insulating plates, which are arranged sequentially along the length or width of the insulating cover. A gap is formed between two adjacent sub-insulating plates, and each sub-insulating plate abuts against the elastic member.

9. The arc-extinguishing structure according to claim 8, characterized in that, The end of each sub-insulating plate has a misaligned portion, and the misaligned portion of any sub-insulating plate is spaced apart from the misaligned portion of the adjacent sub-insulating plate in the thickness direction of the insulating plate, so that two adjacent sub-insulating plates are misaligned.

10. 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.

11. A relay characterized by comprising: include: The arc-extinguishing structure as described in any one of claims 1-10 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 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.

Images