Ceramic component, contact cavity and switching device

Abstract

The application relates to a ceramic part, a contact cavity and a switching device, the contact cavity comprising a side part and a first convex part, the side part being provided with an inner wall, an outer wall and an end face in a back-to-back mode, the inner wall and the outer wall being arranged in a back-to-back mode, the end face being connected between the inner wall and the outer wall, the first convex part being convexly arranged on the end face, the first convex part comprising a first side face, a second side face and a connecting face, the first side face and the second side face being arranged in a back-to-back mode, the connecting face being a plane and being connected between the first side face and the second side face, the connecting face being used for welding a metal part, and at least one of the first side face and the second side face being arranged in an inclined mode relative to the connecting face. The ceramic part, the contact cavity and the switching device provided by the application reduce stress concentration by arranging the first side face and / or the second side face in an inclined mode, reduce the probability of cracking of the ceramic part, and are beneficial to improving the sealing performance of the contact cavity.

Description

Technical Field

[0001] This application relates to the field of switching device technology, and in particular to a ceramic component, a contact cavity, and a switching device. Background Technology

[0002] In switching devices such as relays and vacuum interrupters, the connection between ceramic and metal components is often involved. For example, in relays, a ceramic cover is typically welded to a metal frame to provide an installation environment for the contacts.

[0003] However, in the process of welding ceramic and metal together, the ceramic cover, as a ceramic component, is prone to cracking, which affects the reliability of the connection between the ceramic and metal components, and thus the reliability of the switching device. Utility Model Content

[0004] Therefore, it is necessary to provide a ceramic component, contact cavity, and switching device to address the issue of reducing the probability of cracking during the welding process of ceramic components.

[0005] On one hand, this application provides a ceramic component suitable for connection with a metal component in a switching device. The ceramic component includes a side portion and a first protrusion. The side portion has an inner wall, an outer wall, and an end face disposed opposite to each other. The inner wall and the outer wall are disposed opposite to each other. The end face is connected between the inner wall and the outer wall. The first protrusion protrudes from the end face. The first protrusion includes a first side surface, a second side surface, and a connecting surface. The first side surface and the second side surface are disposed opposite to each other. The connecting surface is a plane and is connected between the first side surface and the second side surface. The connecting surface is used for welding the metal component. At least one of the first side surface and the second side surface is inclined relative to the connecting surface.

[0006] The ceramic component of this application has a first protrusion on its side end face. Since at least one of the first side and the second side of the first protrusion is inclined relative to the connecting surface, during the welding process of the metal component to the connecting surface of the first protrusion, when the welding stress is transferred to the inclined first side and / or the second side, the inclined first side and / or the second side can reduce stress concentration, thereby reducing the probability of cracking of the ceramic component.

[0007] Furthermore, the ceramic component includes a second protrusion that protrudes from the end face. The second protrusion and the first protrusion are spaced apart from each other, and the gap between them forms a first isolation groove. At least one sidewall of the first isolation groove is inclined relative to the connecting surface. In this embodiment, the first isolation groove can isolate cracks to prevent cracks from propagating to the second protrusion, thereby reducing the probability of cracking on the entire end face of the side. In addition, when welding the metal component to the connecting surface, if solder flows along the connecting surface towards the side where the second protrusion is located, the first isolation groove can contain the solder after it flows to it, thereby reducing the probability of it overflowing to the sidewall of the side and preventing the solder from forming stress points on the sidewall, which can easily lead to uneven stress. Therefore, adopting a first isolation groove can also reduce the probability of solder forming stress points on the sidewall of the side, reduce the probability of cracking on the side, and improve the sealing performance of the side. Among them, the inclined structure of the sidewall of the first isolation groove is more conducive to reducing stress concentration.

[0008] Furthermore, in the wall thickness direction of the side portion, the maximum width of the first isolation groove is smaller than the width of the connecting surface. In this embodiment, since the maximum width of the first isolation groove is smaller than the width of the connecting surface, even with the first isolation groove provided, the first protrusion where the connecting surface is located still has a sufficiently large size in the wall thickness direction of the side portion to maintain the strength of the weld with the metal component. Furthermore, the second protrusion is located inside the first protrusion. Thus, the second protrusion is located on the creepage path from the inner wall of the side portion of the stationary contact to the weld point between the connecting surface and the metal component, thereby increasing the creepage path and increasing the insulation resistance.

[0009] Further, the depth of the first isolation groove is h1, where 0.5mm ≤ h1 ≤ 1.5mm. In this embodiment, the depth of the first isolation groove is set to 0.5mm ≤ h1 ≤ 1.5mm. On the one hand, a depth greater than or equal to 0.5mm ensures that the first isolation groove has sufficient depth to accommodate solder, and the groove wall is less likely to be metallized during metallization on the connection surface. Understandably, if the first isolation groove is metallized, the creepage distance will be reduced. Thus, this embodiment avoids a reduction in creepage distance. On the other hand, a depth less than or equal to 1.5mm prevents the first isolation groove from being too deep, thereby ensuring the overall structural strength of the first protrusion.

[0010] Furthermore, the ceramic component includes a third protrusion that protrudes from the end face. The third protrusion and the first protrusion are spaced apart from each other, and the gap between them forms a second isolation groove. In the wall thickness direction of the side portion, the second isolation groove and the first isolation groove are located on different sides of the first protrusion, and at least one sidewall of the second isolation groove is inclined relative to the connecting surface. This is to further reduce the probability of the ceramic component cracking due to stress concentration by utilizing the inclined sidewall of the second isolation groove.

[0011] Furthermore, in the wall thickness direction of the side portion, the maximum width of the second isolation groove is smaller than the width of the connecting surface. In this embodiment, since the maximum width of the second isolation groove is smaller than the width of the connecting surface, even with the second isolation groove provided, the first protrusion where the connecting surface is located still has a sufficiently large dimension in the wall thickness direction of the side portion to facilitate maintaining the strength of the weld with the metal component.

[0012] Furthermore, the depth of the second isolation groove is h2, where 0.5mm ≤ h2 ≤ 1.5mm; and / or, the height of the third protrusion is greater than or equal to the height of the first protrusion. On one hand, a depth of 0.5mm or greater than 0.5mm ensures that the second isolation groove has sufficient depth to accommodate solder, and that the groove wall is not easily metallized during metallization of the connection surface. Understandably, metallization of the second isolation groove reduces the creepage distance. Thus, this embodiment avoids a reduction in creepage distance. On the other hand, a depth of 1.5mm or less avoids the second isolation groove from being too deep, thereby ensuring the overall structural strength of the first protrusion.

[0013] Furthermore, the end face is planar, and the second side of the first protrusion is connected to the inner wall through the end face, so that a first stepped groove is formed on the side of the first protrusion near the inner wall. In this embodiment, even if metal spatter adheres to the end face, the first stepped groove can contain the metal spatter, thereby reducing the probability of metal spatter adhering to the connecting surface, so that the connecting surface provides a clean area for welding metal parts, thereby reducing the probability of metal parts forming a metal passage with the stationary contact.

[0014] Furthermore, the first side face is connected to the outer wall via an end face, forming a second stepped groove on the side of the first protrusion closest to the outer wall. Thus, the first stepped groove and the second stepped groove correspond to the inner and outer sides of the first protrusion, respectively. Since there is a gap between the first side face of the first protrusion and the outer wall, and a gap between the second side face of the first protrusion and the inner wall, when using dry pressing to form the ceramic component, the end face can provide pressure points for the mold on both the inner and outer sides corresponding to the first protrusion. This facilitates compacting the edge of the ceramic component on the side containing the first protrusion, reducing the probability of edge chipping.

[0015] Furthermore, the wall thickness of the side portion is D, and the width of the connecting surface along the wall thickness direction of the side portion is W, where 2 / 3 ≤ W / D ≤ 5 / 6. In this embodiment, on the one hand, since 2 / 3 ≤ W / D, it ensures that the connecting surface occupies a sufficiently wide area in the wall thickness direction of the side portion, reducing solder flow along the connecting surface to the end face of the side portion, thereby reducing solder loss. On the other hand, since W / D ≤ 5 / 6, it provides sufficient space for the first side surface and / or the second side surface to be inclined relative to the connecting surface, avoiding the situation where the space on both sides of the connecting surface is too small, making it difficult to process the inclined first side surface and / or the second side surface. Therefore, this structural arrangement reduces the difficulty of forming the first protrusion in the ceramic component.

[0016] Further, at the end face, the distance from the first side surface to the outer wall along the wall thickness direction of the side portion is D1, where 1 / 8 < D1 / D < 1 / 3; or, at the end face, the distance from the second side surface to the inner wall along the wall thickness direction of the side portion is D2, where 1 / 8 < D2 / D < 1 / 3. In this embodiment, since 1 / 8 < D1 / D, the end face of the side portion has sufficient space on the side near the outer wall of the side portion to provide an inclined first side surface; since D1 / D < 1 / 3, the end face of the side portion does not reserve too much space on the side near the outer wall of the side portion, which would limit the design size of the connecting surface of the first protrusion and make it difficult to use the connecting surface to provide a welding surface for the metal parts of the metal parts. Furthermore, since 1 / 8 < D2 / D, the end face of the side has enough space on the side near the inner wall of the side to set the inclined second side; since D2 / D < 1 / 3, the end face of the side will not have too much space on the side near the inner wall of the side, which would limit the design size of the connecting surface of the first protrusion and make it difficult to use the connecting surface to provide a welding surface for the metal parts of the metal parts.

[0017] Furthermore, the distance from the connecting surface to the end face is H, where 1 / 8 ≤ H / W ≤ 1 / 2. Since H / W ≤ 1 / 2, the first protrusion is flat overall, which helps the first protrusion to obtain good structural strength and reduces the probability of cracking during welding. At the same time, since 1 / 8 ≤ H / W, the first protrusion is prevented from being too flat and having too small a height, which would make it inconvenient to process the inclined first side and / or second side.

[0018] Furthermore, both the first and second side surfaces are inclined relative to the connecting surface. The angle between the first side surface and the connecting surface ranges from 100° to 145°, and the angle between the second side surface and the connecting surface also ranges from 100° to 145°. This structural design results in high structural strength for the first protrusion, and the inclined first and / or second side surfaces reduce the likelihood of stress concentration and cracking in the ceramic component when welding stress is transferred to the first and / or second side surfaces.

[0019] Furthermore, the angle between the first side surface and the end face of the side portion is equal to the angle between the second side surface and the end face of the side portion.

[0020] On the other hand, this application provides a contact cavity comprising a metal component and a ceramic component as described above, wherein the metal component is welded to the connecting surface. In this embodiment, when the metal component is welded to the connecting surface, the inclined first side and / or second side can reduce stress concentration, thereby reducing the probability of cracking in the ceramic component of the contact cavity.

[0021] Furthermore, the metal component is brazed to the connecting surface. In this embodiment, the brazing of the metal component to the reinforcing sheet improves the sealing performance between them.

[0022] In another aspect, this application provides a switching device, which has the contact cavity described above.

[0023] Furthermore, the switching device is a relay, the ceramic component is the ceramic cover of the relay, and the metal component is the metal frame of the relay. In this embodiment, when the ceramic cover of the relay is welded to the metal frame, the inclined first side and / or second side can reduce stress concentration, thereby reducing the probability of cracking of the ceramic cover.

[0024] Furthermore, the metal frame includes an annular body, which is sealed and welded to the connecting surface. During the sealing and welding of the annular body to the connecting surface, the inclined first and / or second sides reduce stress concentration, thereby lowering the probability of cracking in the ceramic component.

[0025] Furthermore, the relay includes at least two stationary contacts, each mounted on the ceramic cover, with one end of each stationary contact protruding from the inner surface of the ceramic cover and the other end protruding from the outer surface of the ceramic cover. Because the two ends of the stationary contacts protrude from the inner and outer surfaces of the ceramic cover respectively, the stationary contacts can accommodate the needs of the relay's moving contact for electrical connection to external circuits.

[0026] Furthermore, the ceramic cover has a first through hole and a second through hole on the side facing away from the metal frame. The stationary contact includes a first stationary contact and a second stationary contact. The first stationary contact passes through the first through hole, and the second stationary contact passes through the second through hole. Both the first and second stationary contacts are sealed and welded to the ceramic cover. This structural arrangement provides a sealed environment for the parts of the first stationary contact, the second stationary contact, and the moving contact of the relay, using the ceramic cover. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a relay according to one embodiment.

[0028] Figure 2 This is a partial structural cross-sectional view of a relay according to one embodiment.

[0029] Figure 3 This is a schematic diagram of the contact cavity of a relay according to one embodiment.

[0030] Figure 4 This is a schematic diagram of the exploded structure of the contact cavity of a relay according to one embodiment.

[0031] Figure 5 This is a cross-sectional structural diagram of the contact cavity of a relay according to one embodiment.

[0032] Figure 6 In one embodiment of the relay, the corresponding Figure 5 A magnified view of the structure within the middle circle.

[0033] Figure 7 In another embodiment of the relay, the corresponding Figure 5 A magnified view of the structure within the middle circle.

[0034] Figure 8 In another embodiment of the relay, the corresponding Figure 5 A magnified view of the structure within the middle circle.

[0035] Figure 9 In another embodiment of the relay, the corresponding Figure 5 A magnified view of the structure within the middle circle.

[0036] Figure 10 In another embodiment of the relay, corresponding Figure 5 A magnified view of the structure within the middle circle.

[0037] Figure 11 This is a cross-sectional structural diagram of the contact cavity of a relay according to another embodiment.

[0038] Figure 12 In one embodiment of the relay, the corresponding Figure 11 A magnified view of the structure within the middle circle.

[0039] Figure label:

[0040] 100. Relay;

[0041] 10. Contact part; 11. First stationary contact; 12. Second stationary contact; 13. Moving contact piece;

[0042] 20. Actuating mechanism; 21. Actuating seat; 22. Actuating lever;

[0043] 30. Magnetic circuit section; 31. Coil assembly; 311. Coil; 312. Coil frame; 32. Moving iron core; 33. Stationary magnetic conductor; 331. Yoke plate; 331a. Perforation; 332. Stationary iron core; 34. Return spring; 35. U-shaped yoke;

[0044] 40. Contact cavity; 41. Ceramic cover; 41a. First through hole; 41b. Second through hole; 411. Side; 411a. End face; 411b. Outer wall; 411c. Inner wall; 412. First protrusion; 412a. First side face; 412b. Second side face; 412c. Connecting surface; 413. Second protrusion; 414. First isolation groove; 415. Third protrusion; 416. Second isolation groove; 42. Metal frame; 421. Annular body; 422. Folded edge;

[0045] 50. Metal casing. Detailed Implementation

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] For switching devices such as relays and vacuum interrupters, the connection between ceramic and metal components is often involved. The inventors have discovered that during the welding process between ceramic and metal components, the ceramic component is prone to cracking due to temperature variations, thus affecting the reliability of the switching device. This is especially true when the ceramic and metal components are sealed together to provide a sealed environment for inert gas to protect the electrical contacts of the switching device; cracking of the ceramic component can compromise the seal, causing leakage and consequently affecting the reliability of the switching device.

[0053] In response, the inventors discovered through research that the most common locations for cracking in ceramic components are concentrated at the edges and where the ceramic component joins with the metal component. To address this, the inventors proposed relevant technical measures to resolve the cracking problem at at least one of these locations, thereby reducing the likelihood of cracking in the ceramic component affecting the reliability of the switching device.

[0054] For ease of understanding, the following explanation will use a relay as an example. Similarly, the technical solutions for solving the problem of cracking that easily occurs during the welding process of ceramic components in other switching devices such as vacuum interrupters can also refer to the relay technical solutions below.

[0055] Combination Figure 1 and Figure 2 As shown, this application provides a relay 100 that can be applied in an automatic control circuit. The relay 100 includes a contact portion 10, an actuating mechanism 20, and a magnetic circuit portion 30.

[0056] The contact portion 10 includes stationary contacts and a moving contact 13. There can be two stationary contacts, namely a first stationary contact 11 and a second stationary contact 12. The two ends of the moving contact 13 correspond to the two stationary contacts (i.e., the first stationary contact 11 and the second stationary contact 12). The moving contact 13 can move closer to or further away from the two stationary contacts under the action of the pushing mechanism 20. When the moving contact 13 approaches and contacts the two stationary contacts, that is, when the moving contact 13 contacts the first stationary contact 11 and the second stationary contact 12, the first stationary contact 11 is electrically connected to the second stationary contact 12 through the moving contact 13, thereby completing the output circuit. Conversely, when the moving contact 13 separates from the two stationary contacts, the moving contact 13 disconnects the electrical connection between the first stationary contact 11 and the second stationary contact 12, thereby disconnecting the output circuit.

[0057] The number of stationary contacts can also be two or more; there is no limit to the number of stationary contacts.

[0058] In this embodiment, the relay 100 includes a contact cavity 40, which provides a sealed environment for the contact portion 10. The contact cavity 40 includes a ceramic component (such as a ceramic cover 41) and a metal component (such as a metal frame 42). In other embodiments, the ceramic component is not limited to the ceramic cover 41, and may also be other ceramic structural components in the switching device; the metal component is not limited to the metal frame 42, and may also be other metal components in the switching device.

[0059] For ease of understanding, the following description will take the contact cavity 40, which includes a ceramic cover 41 and a metal frame 42, as an example to further illustrate the contact cavity 40.

[0060] Combination Figure 3 and Figure 4 As shown, the contact cavity 40 includes a ceramic cover 41 and a metal frame 42, with the ceramic cover 41 connected to the metal frame 42. In some embodiments, the ceramic cover 41 and the metal frame 42 can be sealed together. For example, in some embodiments, the ceramic cover 41 and the metal frame 42 are brazed together to improve the sealing performance between them.

[0061] Combination Figure 5 and Figure 6 As shown, the ceramic cover 41 includes a side portion 411 and a first protrusion 412. The side portion 411 has an end face 411a, an outer wall 411b, and an inner wall 411c. The inner wall 411c is disposed opposite to the outer wall 411b, and the end face 411a is connected between the inner wall 411c and the outer wall 411b. The first protrusion 412 protrudes from the end face 411a of the side portion 411. The first protrusion 412 includes a first side surface 412a, a second side surface 412b, and a connecting surface 412c. The first side surface 412a and the second side surface 412b are disposed opposite to each other, and the connecting surface 412c is a plane and is connected between the first side surface 412a and the second side surface 412b. The connecting surface 412c is used for welding to the metal frame 42.

[0062] It should be noted that the ceramic cover 41, as a cover structure, has an open end and a closed end. For example, in some embodiments, the ceramic cover 41 includes a top connected to the side portion 411, and in this embodiment, the end face 411a is the surface of the side portion 411 at the end farther from the top.

[0063] In some embodiments, the side portion 411 may not be connected to the top. The side portion 411 is a cylindrical structure with an inner wall 411c and an outer wall 411b. Both ends of the side portion 411 have end faces 411a. Thus, a first protrusion 412 can be provided for each end face 411a of the two ends of the side portion 411, so that the connecting surface 412c of the first protrusion 412 can be used to connect the corresponding metal parts.

[0064] At least one of the first side surface 412a and the second side surface 412b is inclined relative to the connecting surface 412c. Inclined means that it is a slope relative to the connecting surface 412c, not a perpendicular surface to the connecting surface 412c. For example, if the first side surface 412a is inclined relative to the connecting surface 412c, then the first side surface 412a and the connecting surface 412c are not perpendicular to each other. Thus, during the welding process between the metal frame 42 and the connecting surface 412c, when welding stress is transferred to the inclined first side surface 412a and / or the second side surface 412b, the inclined first side surface 412a and / or the second side surface 412b can reduce stress concentration, thereby reducing the probability of cracking in the ceramic cover 41.

[0065] It should be noted that the first side surface 412a can be either a plane or a curved surface. The second side surface 412b can also be either a plane or a curved surface. For the curved first side surface 412a, it is inclined relative to the connecting surface 412c; that is, the plane defined by the edge connecting the first side surface 412a and the connecting surface 412c, and the edge connecting the curved surface and the first side surface 412a, is inclined relative to the connecting surface 412c. Correspondingly, for the curved second side surface 412b, it is inclined relative to the connecting surface 412c; that is, the plane defined by the edge connecting the second side surface 412b and the connecting surface 412c, and the edge connecting the curved surface and the second side surface 412b, is inclined relative to the connecting surface 412c.

[0066] In some embodiments, the metal frame 42 is sealed and welded to the connecting surface 412c. Since the inclined first side 412a and / or second side 412b can reduce stress concentration and reduce the probability of cracking of the ceramic cover 41, this structural arrangement is beneficial to maintaining the sealing performance of the contact cavity 40.

[0067] The metal frame 42 includes an annular body 421, which is sealed and welded to the connecting surface 412c. Since at least one of the first side surface 412a and the second side surface 412b is inclined relative to the connecting surface 412c, the welding stress generated during the sealing and welding process between the annular body 421 and the connecting surface 412c is transferred to the inclined first side surface 412a and / or the second side surface 412b. This reduces stress concentration and thus lowers the probability of cracking in the ceramic cover 41, thereby improving the sealing performance of the contact cavity 40.

[0068] It should be noted that the side portion 411 is in a closed loop shape at the end where the first protrusion 412 is located, thus the ceramic cover 41 encloses and forms a space for receiving the contact portion 10. The annular body 421 serves as a structural member connected to the connecting surface 412c, and the annular body 421 is annular to ensure a sealed connection with the connecting surface 412c. It should be noted that the annular body 421 can be a smooth cylindrical structure, or it can consist of multiple cylindrical structures of different sizes, which can be connected by bending portions. The shape of the annular body 421 is not limited here, as long as it meets the requirements for a sealed connection with the connecting surface 412c.

[0069] The stationary contacts are all mounted on the ceramic cover 41, with one end of each stationary contact protruding from the inner surface of the ceramic cover 41 and the other end protruding from the outer surface of the ceramic cover 41, so that the stationary contacts can meet the needs of the moving contact 13 to electrically connect to the external circuit.

[0070] like Figures 3 to 5 As shown, in some embodiments, a first through hole 41a and a second through hole 41b are provided on the side of the ceramic cover 41 facing away from the metal frame 42 (i.e., the top of the ceramic cover 41). A first stationary contact 11 passes through the first through hole 41a, and a second stationary contact 12 passes through the second through hole 41b. Both the first stationary contact 11 and the second stationary contact 12 are sealed and welded to the ceramic cover 41 so as to provide a sealed environment for the parts of the first stationary contact 11, the second stationary contact 12 and the moving contact piece 13 that come into contact using the contact cavity 40.

[0071] Continue to combine Figure 6 As shown, in some embodiments, the included angle α between the first side surface 412a and the connecting surface 412c ranges from 100° to 145°. Within this range, the first protrusion 412 has high structural strength, and when welding stress is transmitted to the first side surface 412a, the inclined first side surface 412a can reduce the probability of stress concentration and cracking.

[0072] The angle α between the first side surface 412a and the connecting surface 412c can be 100°, 105°, 115°, 125°, 135° or 145°, and is not limited here.

[0073] In some embodiments, the included angle β between the second side surface 412b and the connecting surface 412c ranges from 100° to 145°. Within this range, the first protrusion 412 has high structural strength, and when welding stress is transmitted to the second side surface 412b, the inclined second side surface can reduce the probability of stress concentration and cracking.

[0074] The angle β between the second side surface 412b and the connecting surface 412c can be 100°, 105°, 115°, 125°, 135° or 145°, and is not limited here.

[0075] In some embodiments, both the first side surface 412a and the second side surface 412b are inclined relative to the connecting surface 412c. The first side surface 412a and the second side surface 412b may be at the same angle to the connecting surface 412c, that is, the included angle α between the first side surface 412a and the connecting surface 412c is equal to the included angle β between the second side surface 412b and the connecting surface 412c.

[0076] For example, the included angle α between the first side surface 412a and the connecting surface 412c is 100°, and the included angle β between the second side surface 412b and the connecting surface 412c is 100°; or, the included angle α between the first side surface 412a and the connecting surface 412c is 110°, and the included angle β between the second side surface 412b and the connecting surface 412c is 110°; or, the included angle α between the first side surface 412a and the connecting surface 412c is 135°, and the included angle β between the second side surface 412b and the connecting surface 412c is 135°; or, the included angle α between the first side surface 412a and the connecting surface 412c is 140°, and the included angle β between the second side surface 412b and the connecting surface 412c is 140°.

[0077] In this embodiment, the included angles α and β are set to be equal, so that the first side surface 412a and the second side surface 412b are inclined at the same degree relative to the connecting surface 412c. Thus, the structural consistency of the two sides of the first protrusion 412 is good, resulting in a more consistent effect of reducing welding stress concentration on the first side surface 412a and the second side surface 412b during the welding process between the annular body 421 and the connecting surface 412c. In other words, the stress on both sides of the first protrusion 412 is uniform, which helps to reduce the probability of cracking due to uneven stress.

[0078] In some embodiments, the first side surface 412a and the second side surface 412b may be arranged at different angles to the connecting surface 412c. For example, the angle α between the first side surface 412a and the connecting surface 412c is 100°, and the angle β between the second side surface 412b and the connecting surface 412c is 140°; or, the angle α between the first side surface 412a and the connecting surface 412c is 110°, and the angle β between the second side surface 412b and the connecting surface 412c is 105°; or, the angle α between the first side surface 412a and the connecting surface 412c is 125°, and the angle β between the second side surface 412b and the connecting surface 412c is 145°; or, the angle α between the first side surface 412a and the connecting surface 412c is 135°, and the angle β between the second side surface 412b and the connecting surface 412c is 115°.

[0079] The tilt angle of the first side surface 412a and the second side surface 412b relative to the connecting surface 412c is not limited here. As long as at least one of the first side surface 412a and the second side surface 412b is tilted relative to the connecting surface 412c, the tilted first side surface 412a and / or the second side surface 412b can be used to reduce the concentration of welding stress, thereby reducing the probability of cracking of the ceramic cover 41.

[0080] Combination Figure 7 As shown, in some embodiments, the wall thickness of the side portion 411 is D, and the width of the connecting surface 412c along the wall thickness direction of the side portion 411 is W, where 2 / 3 ≤ W / D ≤ 5 / 6. Within this range, on the one hand, since 2 / 3 ≤ W / D, it is ensured that the connecting surface 412c occupies a sufficiently wide area in the wall thickness direction of the side portion 411, reducing the flow of solder along the connecting surface 412c to the end face 411a of the side portion 411, thereby reducing solder loss. On the other hand, since W / D ≤ 5 / 6, sufficient space is provided for the first side surface 412a and / or the second side surface 412b to be inclined relative to the connecting surface 412c, avoiding the situation where the space on both sides of the connecting surface 412c is too small, making it difficult to process the inclined first side surface 412a and / or the second side surface 412b. Therefore, this structural arrangement reduces the difficulty of forming the first protrusion 412 in the ceramic cover 41.

[0081] Furthermore, continue to combine Figure 7 As shown, at the end face 411a of side portion 411, the distance from the first side surface 412a along the wall thickness direction of side portion 411 to the outer wall 411b of side portion 411 is D1, where 1 / 8 < D1 / D < 1 / 3. Since 1 / 8 < D1 / D, the end face 411a of side portion 411 has sufficient space on the side near the outer wall 411b of side portion 411 to accommodate the inclined first side surface 412a; since D1 / D < 1 / 3, the end face 411a of side portion 411 does not have excessively large reserved space on the side near the outer wall 411b of side portion 411, which limits the design dimensions of the connecting surface 412c of the first protrusion 412, making it difficult to use the connecting surface 412c to provide a welding surface for the annular body 421 of the metal frame 42.

[0082] At the end face 411a of side portion 411, the distance from the second side surface 412b along the wall thickness direction of side portion 411 to the inner wall 411c of side portion 411 is D2, where 1 / 8 < D2 / D < 1 / 3. Since 1 / 8 < D2 / D, the end face 411a of side portion 411 has sufficient space on the side near the inner wall 411c of side portion 411 to accommodate the inclined second side surface 412b. Since D2 / D < 1 / 3, the end face 411a of side portion 411 does not have excessively large reserved space on the side near the inner wall 411c of side portion 411, which would limit the design dimensions of the connecting surface 412c of the first protrusion 412, making it difficult to use the connecting surface 412c to provide a welding surface for the annular body 421 of the metal frame 42.

[0083] Continue to combine Figure 7 As shown, in some embodiments, the distance from the connecting surface 412c to the end face 411a of the side portion 411 is H, where 1 / 8 ≤ H / W ≤ 1 / 2. It should be noted that the distance from the connecting surface 412c to the end face 411a of the side portion 411 can be understood as the height of the first protrusion 412. In this embodiment, since H / W ≤ 1 / 2, the first protrusion 412 is generally flat, which helps the first protrusion 412 to obtain good structural strength and reduces the probability of cracking during welding. Simultaneously, since 1 / 8 ≤ H / W, it avoids the first protrusion 412 from being too flat and having a small height, making it inconvenient to process the inclined first side surface 412a and / or the second side surface 412b.

[0084] In some embodiments, the end face 411a is flat, and the first protrusion 412 can be machined on the end face 411a by mechanical grinding, thereby facilitating the processing of the ceramic cover 41.

[0085] In practical applications, relays often interrupt electric arcs. The energy of the electric arc is extremely high, which can easily burn the contacts and cause the contact surface to become molten. Under the magnetic force of the permanent magnet, liquid metal splashes can easily form a metal path on the inner wall of the ceramic cover 41, leading to poor insulation.

[0086] Combination Figure 7 As shown, the second side 412b of the first protrusion 412 is connected to the inner wall 411c via the end face 411a, such that a first stepped groove is formed on the side of the first protrusion 412 near the inner wall 411c. In this embodiment, even if metal spatter adheres to the end face 411a, the first stepped groove can contain the metal spatter, thereby reducing the probability of metal spatter adhering to the connecting surface 412c. This provides a clean area for the welding annular body 421, reducing the probability of the annular body 421 forming a metal passage with the stationary contact.

[0087] Furthermore, continue to combine Figure 7As shown, the first side surface 412a is connected to the outer wall 411b via the end face 411a, forming a second stepped groove on the side of the first protrusion 412 near the outer wall 411b. Thus, the first stepped groove and the second stepped groove correspond to the inner and outer sides of the first protrusion 412, respectively. Since there is a gap between the first side surface 412a of the first protrusion 412 and the outer wall 411b, and a gap between the second side surface 412b of the first protrusion 412 and the inner wall 411c, when the ceramic cover 41 is formed using a dry pressing process, the end face 411a can provide pressure points for the mold on both the inner and outer sides corresponding to the first protrusion 412, facilitating the compaction of the edge of the ceramic cover 41 on the side containing the first protrusion 412 and reducing the probability of edge chipping in the ceramic cover 41.

[0088] Combination Figure 8 As shown, in some embodiments, the ceramic cover 41 includes a second protrusion 413, which protrudes from the end face 411a of the side portion 411.

[0089] It should be noted that the second protrusion 413 may be located on the outer side of the first protrusion 412 or on the inner side of the first protrusion 412. The outer side of the first protrusion 412 refers to the side of the first protrusion 412 that points towards the outside of the ceramic cover 41; correspondingly, the inner side of the first protrusion 412 refers to the side of the first protrusion 412 that points towards the inside of the ceramic cover 41.

[0090] For example, combining Figure 8 As shown, the second protrusion 413 is located outside the first protrusion 412. For example, in combination... Figure 9 As shown, the second protrusion 413 is located inside the first protrusion 412.

[0091] Combination Figure 8 and Figure 9 As shown, the second protrusion 413 is located either outside or inside the first protrusion 412. The second protrusion 413 and the first protrusion 412 are spaced apart from each other, and the gap between them forms the first isolation groove 414.

[0092] The first isolation groove 414 can serve to isolate cracks. For example, during the welding process between the annular body 421 and the connecting surface 412c, if a crack appears on the side of the first protrusion 412 near the second protrusion 413, when the crack propagates to the first isolation groove 414, the groove wall of the first isolation groove 414 reduces stress concentration to prevent the crack from propagating to the second protrusion 413, thereby reducing the probability of cracking on the entire end face 411a of the side portion 411, which helps to maintain the airtightness between the metal frame 42 and the connecting surface 412c.

[0093] Furthermore, when welding the metal frame 42 to the connecting surface 412c, if solder flows along the connecting surface 412c towards the side where the second protrusion 413 is located, the solder will flow into the first isolation groove 414, which can contain the solder, thereby reducing the probability of it overflowing to the side wall of the side portion 411. This prevents the solder from forming stress points on the side wall of the side portion 411, which could easily lead to uneven stress. Therefore, using the first isolation groove 414 can also reduce the probability of the solder forming stress points on the side wall of the side portion 411, reducing the probability of cracking in the side portion 411 and improving the sealing performance of the side portion 411.

[0094] It should be noted that when the second protrusion 413 is located outside or inside the first protrusion 412, it can also increase the creepage distance.

[0095] Since the contact part 10 is located inside the ceramic cover 41, an electric arc may be generated when the contact part 10 is working. The high voltage DC relay has a working condition to cut off the electric arc. The electric arc energy is extremely high, which can easily burn the contact point and cause the contact point surface to be in a molten state. Under the magnetic force of the permanent magnet, liquid metal splashes are formed, which eventually form a metal passage on the inner wall of the ceramic in the later stage of the life, leading to poor insulation.

[0096] In the embodiment where the ceramic cover 41 includes a first protrusion 412 and a second protrusion 413, since the gap between the second protrusion 413 and the first protrusion 412 forms a first isolation groove 414, the first isolation groove 414 can be used to reduce insulation short circuits and insulation degradation caused by arc spatter.

[0097] Understandably, in the embodiment where the second protrusion 413 is located inside the first protrusion 412, since the second protrusion 413 is located inside the first protrusion 412, the second protrusion 413 is located on the creepage path from the inner wall 411c of the side portion 411 of the stationary contact to the welding point between the connecting surface 412 and the metal frame 42. Consequently, the second protrusion 413 can increase the creepage path and increase the insulation resistance, thereby improving the electrical isolation performance between the stationary contact and the metal frame 42.

[0098] Furthermore, at least one sidewall of the first isolation groove 414 is inclined relative to the connecting surface 412c. The inclined sidewall of the first isolation groove 414 is more conducive to reducing stress concentration. That is, after the welding stress of the annular body 421 and the connecting surface 412c is transferred to the sidewall of the first isolation groove 414, the inclined sidewall is less likely to experience stress concentration. Thus, this structural design can further reduce the probability of cracking in the side 411.

[0099] It should be noted that the first isolation groove 414 includes, but is not limited to, a triangular groove or a trapezoidal groove.

[0100] In embodiments where the ceramic cover 41 includes the second protrusion 413, the height of the first protrusion 412 may be different from or equal to the height of the second protrusion 413. No limitation is made here.

[0101] For example, in some embodiments, the height of the second protrusion 413 is equal to the height of the first protrusion 412. That is, the second protrusion 413 and the first protrusion 412 protrude from the end face 411a at the same height. When the end face 411a is set as a plane, the surfaces of the second protrusion 413 and the first protrusion 412 facing away from the end face 411a are flush, which makes it convenient to process the first protrusion 412 and the second protrusion 413 by machining methods such as cutting or grinding.

[0102] For example, in some embodiments, the surfaces of the opposing end faces 411a of the second protrusion 413 and the first protrusion 412 are not flush. This allows the heights of the second protrusion 413 and the first protrusion 412 to be set as needed. Understandably, regardless of whether the height of the second protrusion 413 is equal to or unequal to the height of the first protrusion 412, the second protrusion 413 always serves to increase the creepage path, thereby improving the electrical isolation performance between the stationary contact and the metal frame 42.

[0103] In some embodiments, the depth of the first isolation groove 414 is h1, where 0.5mm ≤ h1 ≤ 1.5mm. The depth of the first isolation groove 414 refers to the shortest distance from the bottom of the first isolation groove 414 to the surface where the opening of the first isolation groove 414 is located. Since the first isolation groove 414 is formed between the first protrusion 412 and the second protrusion 413, the opening of the first isolation groove 414 is located between the first protrusion 412 and the second protrusion 413. Therefore, when the height of the second protrusion 413 is equal to the height of the first protrusion 412, the height of the first protrusion 412 is equal to the depth of the first isolation groove 414. In other words, the distance between the bottom of the first isolation groove 414 and the connecting surface 412c is the depth of the first isolation groove 414.

[0104] Accordingly, when the height of the second protrusion 413 is not equal to the height of the first protrusion 412, the smaller of the heights of the second protrusion 413 and the first protrusion 412 is the depth of the first isolation groove 414. For example, when the height of the first protrusion 412 is greater than the height of the second protrusion 413, the height of the first protrusion 412 is the depth of the first isolation groove 414.

[0105] In this embodiment, the depth of the first isolation groove 414 is set to 0.5mm ≤ h1 ≤ 1.5mm. On one hand, a depth greater than or equal to 0.5mm ensures that the first isolation groove 414 has sufficient depth to accommodate solder, and that the groove wall of the first isolation groove 414 is not easily metallized during metallization on the connection surface 412c. Understandably, metallization of the first isolation groove 414 would reduce the creepage distance. Therefore, this embodiment avoids a reduction in creepage distance. On the other hand, a depth less than or equal to 1.5mm prevents the first isolation groove 414 from becoming too deep, thus ensuring the overall structural strength of the first protrusion 412.

[0106] In some embodiments, the maximum width of the first isolation groove 414 in the wall thickness direction of the side portion 411 is smaller than the width of the connecting surface 412c. Therefore, even with the first isolation groove 414 provided, its maximum width is smaller than the width of the connecting surface 412c, resulting in a sufficiently large size of the first protrusion 412 where the connecting surface 412c is located in the wall thickness direction of the side portion 411, which facilitates maintaining the strength of the weld with the annular body 421.

[0107] It should be noted that in embodiments where the end face 411a is provided with a first protrusion 412 and a second protrusion 413, the positions of the first protrusion 412 and the second protrusion 413 on the end face 411a can be varied.

[0108] For example, such as Figure 8 As shown, there is a gap between the second side surface 412b of the first protrusion 412 and the inner wall 411c, and the second protrusion 413 is located outside the first protrusion 412. The outer side surface of the second protrusion 413 may be flush with the outer wall 411b. In some embodiments, the outer side surface of the second protrusion 413 may not be flush with the outer wall 411b.

[0109] For example, such as Figure 9 As shown, there is a gap between the first side surface 412a of the first protrusion 412 and the outer wall 411b, and the second protrusion 413 is located inside the first protrusion 412. The inner side surface of the second protrusion 413 may be flush with the inner wall 411c. In some embodiments, the inner side surface of the second protrusion 413 may not be flush with the inner wall 411c.

[0110] In some implementations, combined Figure 10As shown, the second protrusion 413 is located inside the first protrusion 412. The first side surface 412a of the first protrusion 412 can be flush with the outer wall 411b, and the inner side surface of the second protrusion 413 can be flush with the inner wall 411c. It should be noted that, in addition to the first protrusion 412 and the second protrusion 413, a greater number of protrusions can be provided on the end face 411a of the side portion 411.

[0111] For example, combining Figure 11 and Figure 12 As shown, in some embodiments, the ceramic cover 41 includes a third protrusion 415, which protrudes from the end face 411a of the side portion 411. The third protrusion 415 and the first protrusion 412 are spaced apart from each other, and the gap between them forms a second isolation groove 416. In the wall thickness direction of the side portion 411, the second isolation groove 416 and the first isolation groove 414 are located on different sides of the first protrusion 412.

[0112] Understandably, such as Figure 8 As shown, in one embodiment, the second isolation groove 416 may be located inside the first protrusion 412, and the first isolation groove 414 may be located outside the first protrusion 412. In this case, the third protrusion 415 is located inside the first protrusion 412, and the second protrusion 413 is located outside the first protrusion 412.

[0113] In another embodiment, the first isolation groove 414 may be located inside the first protrusion 412, and the second isolation groove 416 may be located outside the first protrusion 412. In this case, the second protrusion 413 may be located inside the first protrusion 412, and the third protrusion 415 may be located outside the first protrusion 412.

[0114] The relative positions of the second protrusion 413 and the third protrusion 415 to the second protrusion 413 are not specified here.

[0115] Similar to the first isolation groove 414, the second isolation groove 416 also serves to isolate cracks and contain solder flowing along the connection surface 412c. The function of the second isolation groove 416 will not be elaborated here.

[0116] The second isolation groove 416 has at least one side wall that is inclined relative to the connecting surface 412c, so as to further reduce the probability of the ceramic cover 41 cracking due to stress concentration by utilizing the inclined side wall of the second isolation groove 416.

[0117] It should be noted that the second isolation groove 416 includes, but is not limited to, a triangular groove or a trapezoidal groove.

[0118] In embodiments where the ceramic cover 41 includes a third protrusion 415, the height of the first protrusion 412 may be different from or equal to the height of the third protrusion 415. No limitation is made here.

[0119] For example, in some embodiments, the height of the third protrusion 415 is equal to the height of the first protrusion 412, which is simple and easy to process.

[0120] For example, in some embodiments, the height of the third protrusion 415 is greater than the height of the first protrusion 412. Thus, when the third protrusion 415 is located inside the first protrusion 412, the higher third protrusion 415 increases the creepage path of the stationary contact along the inner wall 411c to the metal frame 42; correspondingly, when the third protrusion 415 is located outside the first protrusion 412, the higher third protrusion 415 increases the creepage path of the stationary contact along the outer wall 411b to the metal frame 42. Therefore, regardless of whether the third protrusion 415 is located inside or outside the first protrusion 412, the higher third protrusion 415 can increase the creepage path, thereby further improving the electrical isolation performance between the stationary contact and the metal frame 42.

[0121] In some embodiments, the depth of the second isolation groove 416 is h2, where 0.5mm ≤ h2 ≤ 1.5mm. The depth of the second isolation groove 416 refers to the shortest distance from the bottom of the second isolation groove 416 to the surface where the opening of the second isolation groove 416 is located. Since the second isolation groove 416 is formed between the first protrusion 412 and the third protrusion 415, the opening of the second isolation groove 416 is located between the first protrusion 412 and the third protrusion 415. Therefore, when the height of the third protrusion 415 is greater than or equal to the height of the first protrusion 412, the distance between the bottom of the second isolation groove 416 and the connecting surface 412c is the depth of the second isolation groove 416. When the height of the third protrusion 415 is less than the height of the first protrusion 412, the distance between the bottom of the second isolation groove 416 and the surface of the third protrusion 415 away from the end face 411a is the depth of the second isolation groove 416.

[0122] In this embodiment, the depth of the second isolation groove 416 is set to 0.5mm ≤ h2 ≤ 1.5mm. On one hand, a depth greater than or equal to 0.5mm ensures that the second isolation groove 416 has sufficient depth to accommodate solder, and that the groove walls are not easily metallized during metallization on the connection surface 412c. Understandably, metallization of the second isolation groove 416 would reduce the creepage distance. Therefore, this embodiment avoids a reduction in creepage distance. On the other hand, a depth less than or equal to 1.5mm prevents the second isolation groove 416 from becoming too deep, thus ensuring the overall structural strength of the first protrusion 412.

[0123] In some embodiments, the maximum width of the second isolation groove 416 in the wall thickness direction of the side portion 411 is smaller than the width of the connecting surface 412c. Therefore, even with the second isolation groove 416 provided, its maximum width is smaller than the width of the connecting surface 412c, resulting in a sufficiently large size of the first protrusion 412 where the connecting surface 412c is located in the wall thickness direction of the side portion 411, which facilitates maintaining the strength of the weld with the annular body 421.

[0124] It should be noted that the parts of relay 100 not covered may be the same as or may be implemented using existing technology, and are not limited here.

[0125] For example, in some implementations, it is combined again. Figure 2 As shown, the pushing mechanism 20 includes a pushing base 21 and a pushing rod 22 connected to each other. The moving contact 13 is disposed on the pushing base 21. The pushing rod 22 is used to drive the pushing base 21 to move closer to or away from the stationary contact when it moves, so that the moving contact 13 on the pushing base 21 comes into contact with or separates from the stationary contact, thereby achieving the purpose of electrically connecting or disconnecting the moving contact 13 from the stationary contact, so as to meet the need to connect or disconnect the automatic control circuit connected to the relay 100.

[0126] Combination Figure 1 and Figure 2 As shown, the magnetic circuit part 30 includes a coil assembly 31, a moving iron core 32, and a stationary conductor magnet 33.

[0127] The coil assembly 31 includes a coil 311 and a coil frame 312. The coil 311 generates an electromagnetic field when energized. The coil frame 312 has a mounting hole. A moving iron core 32 is disposed within the mounting hole and connected to the end of the push rod 22 away from the push base 21. The moving iron core 32 attracts a stationary magnet 33 in the electromagnetic field generated by the energized coil 311, thereby enabling the moving iron core 32 to move within the mounting hole in a direction close to the stationary magnet 33.

[0128] In some embodiments, the stationary magnet 33 includes a yoke plate 331.

[0129] In some embodiments, the stationary magnet 33 includes a yoke plate 331 and a stationary iron core 332 disposed on the yoke plate 331. The structure of the stationary magnet 33 is not limited here, as long as the moving iron core 32 can magnetically attract the stationary magnet 33 when the coil 311 is energized, so as to drive the moving contact 13 to contact or separate from the stationary contact.

[0130] It should be noted that the stationary magnet 33 is located between the moving iron core 32 and the contact portion 10. Since the contact cavity 40 of the relay 100 provides a sealed environment for the contact portion 10, the contact cavity 40 can be located on the side of the stationary magnet 33 facing away from the moving iron core 32.

[0131] Taking the static conductor 33 including the yoke plate 331 as an example, the ceramic cover 41 is sealed to the side of the yoke plate 331 facing away from the moving iron core 32 through the metal frame 42. That is, one end of the metal frame 42 is sealed to the connecting surface 412c, and the other end is sealed to the yoke plate 331.

[0132] It should be noted that after the ceramic cover 41 is connected to the side of the yoke plate 331 facing away from the moving iron core 32 via the metal frame 42, the ceramic cover 41, the metal frame 42, and the yoke plate 331 together enclose and form a sealed space for the contact portion 10. Relative to the overall structure of the relay 100, this sealed space refers to the sealed environment of the contact portion 10 between the moving contact piece 13 and the two stationary contacts within the contact cavity 40. For the contact cavity 40 itself, the components of the contact cavity 40 are sealed together, and the other structures of the relay 100 are sealed together with the structure of the contact cavity 40. Thus, good sealing is achieved both between the structures of the contact cavity 40 itself and between the contact cavity 40 and the surrounding structural components, thereby enabling the relay 100 as a whole to provide a good sealed environment for the contact portion 10.

[0133] For example, in an embodiment where two stationary contacts are respectively installed on the top wall of the ceramic cover 41, since the first stationary contact 11 is installed through the first through hole 41a and the second stationary contact 12 is installed through the second through hole 41b, the first stationary contact 11 and the second stationary contact 12 can form electrical terminals on the outside of the ceramic cover 41, thereby meeting the connection requirements between the output circuit and an external controlled object. Simultaneously, the first stationary contact 11 and the second stationary contact 12 are respectively inserted into the interior of the ceramic cover 41 through the first through hole 41a and the second through hole 41b, so as to correspond to the moving contact piece 13 located inside the ceramic cover 41. Since both the first stationary contact 11 and the second stationary contact 12 are sealed and welded to the ceramic cover 41, the contact portion 10 is in a sealed environment.

[0134] Combination Figure 2 and Figure 3 As shown, in some embodiments, the metal frame 42 includes a flange 422. The flange 422 is connected to one end of the annular body 421 facing away from the ceramic cover 41 and is bent outward relative to the annular body 421. The flange 422 is sealed and welded to the yoke plate 331. The flange 422 can increase the connection area between the metal frame 42 and the yoke plate 331, thereby improving the welding sealing performance.

[0135] Continue reading Figure 2As shown, in some embodiments, the movable contact 13 and the push seat 21 are connected, and both are disposed within the ceramic cover 41. The yoke plate 331 has a through hole 331a through which the push rod 22 can pass. Specifically, one end of the push rod 22 is connected to the push seat 21, and the other end passes through the through hole 331a through the yoke plate 331 to connect with the movable iron core 32. In this embodiment, the push rod 22 passes through the through hole 331a of the yoke plate 331, and the push seat 21 and the movable iron core 32, which are connected to both ends of the push rod 22, are located on both sides of the yoke plate 331.

[0136] Since the push rod 22 passes through the through hole 331a and is connected between the push seat 21 and the moving iron core 32, the push rod 22 can transmit the power of the moving iron core 32 moving in the mounting hole of the coil frame 312 to the push seat 21, so that the push seat 21, with the moving contact piece 13, comes into contact with or separates from the two stationary contacts.

[0137] Continue reading Figure 2 As shown, in some embodiments, the relay 100 further includes a metal housing 50, which is a bottomed cylindrical shape. The open end of the metal housing 50 is sealed to the side of the yoke plate 331 facing away from the contact cavity 40. The perforation 331a on the yoke plate 331 corresponds to the interior of the metal housing 50, thereby sealing the area around the perforation 331a with the metal housing 50. Thus, even if the contact cavity 40 is connected to the space on the other side of the yoke plate 331 through the perforation 331a, with the metal housing 50 sealing the area around the perforation 331a, the space enclosed by the contact cavity 40 is connected to the space enclosed by the metal housing 50 through the perforation 331a, and the overall system exhibits good sealing performance.

[0138] The sealing connection between the metal shell 50 and the yoke plate 331 includes, but is not limited to, welding or glue connection.

[0139] It should be noted that, based on the fact that the push rod 22 passes through the through hole 331a, the metal shell 50 seals the area around the through hole 331a, and thus the end of the push rod 22 connected to the moving iron core 32 and the moving iron core 32 are both located inside the metal shell 50. In some embodiments, the metal shell 50 not only serves a sealing function, but can also guide the movement of the moving iron core 32 to improve the movement stability of the moving iron core 32. For example, the peripheral sidewall of the moving iron core 32 slides in contact with the inner wall of the metal shell 50, so that the moving iron core 32 is less likely to wobble in the direction perpendicular to the push rod 22 when it moves, thereby improving the movement stability.

[0140] In an embodiment where the relay 100 includes a metal housing 50, at least a portion of the structure of the metal housing 50 is located within the mounting hole of the coil frame 312. That is, after the coil 311 is wound around the coil frame 312, it is fitted together with the coil frame 312 onto the outside of the metal housing 50, allowing the coil 311 to magnetize the moving iron core 32 located within the metal housing 50 when energized. Alternatively, in an embodiment where the stationary magnet 33 includes a stationary iron core 332, the magnetic lines of force generated by the energized coil 311 can also be transmitted to the stationary iron core 332 via the yoke plate 331, causing the moving iron core 32 to magnetically attract the stationary iron core 332. This, in turn, drives the push rod 22 to move the push seat 21 toward the side where the first stationary contact 11 and the second stationary contact 12 are located. Subsequently, the moving contact piece 13 contacts the first stationary contact 11 and the second stationary contact 12, electrically connecting the first stationary contact 11 and the second stationary contact 12 using the moving contact piece 13.

[0141] Continue reading Figure 2 As shown, in some embodiments, a return spring 34 is provided between the yoke plate 331 and the moving iron core 32.

[0142] In this embodiment, when the coil 311 is energized, the moving iron core 32 attracts the yoke plate 331 in the electromagnetic field generated by the coil 311, thereby overcoming the elastic force of the return spring 34 and moving towards the yoke plate 331. In this way, the push rod 22 drives the push seat 21 to move towards the stationary contacts, causing the moving contact piece 13 on the push seat 21 to contact the two stationary contacts, thus establishing an electrical connection between the two stationary contacts using the moving contact piece 13.

[0143] When the coil 311 is de-energized, the moving iron core 32 moves away from the yoke plate 331 under the drive of the return spring 34. In this way, the moving iron core 32 moves the push seat 21 away from the stationary contact via the push rod 22, so that the moving contact piece 13 separates from the two stationary contacts, thereby breaking the electrical contact.

[0144] Thus, the opening and closing of the relay 100 can be controlled by energizing the coil 311, so that the relay 100 can conduct or disconnect the automatic control circuit to which it is connected. That is, the relay 100 plays the role of a "switch" in the automatic control circuit.

[0145] See again Figure 1 As shown, in some embodiments, the magnetic circuit portion 30 further includes a U-shaped yoke 35. A yoke plate 331 is connected to both ends of the U-shaped yoke 35 to enclose and form an installation space. A coil 311 is disposed within this installation space. In this embodiment, the pusher seat 21 is located on the side of the yoke plate 331 facing away from the moving iron core 32. The end of the push rod 22 furthest from the moving contact 13 passes through the yoke plate 331 and is connected to the moving iron core 32.

[0146] 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.

[0147] 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. A ceramic component suitable for connection with a metal component in a switching device, characterized in that, The ceramic component includes a side portion and a first protrusion. The side portion has an inner wall, an outer wall, and an end face that are arranged opposite to each other. The inner wall and the outer wall are arranged opposite to each other. The end face is connected between the inner wall and the outer wall. The first protrusion protrudes from the end face. The first protrusion includes a first side surface, a second side surface, and a connecting surface. The first side surface and the second side surface are arranged opposite to each other. The connecting surface is a plane and is connected between the first side surface and the second side surface. The connecting surface is used to weld the metal component. At least one of the first side surface and the second side surface is inclined relative to the connecting surface.

2. The ceramic component according to claim 1, characterized in that, The ceramic component includes a second protrusion that protrudes from the end face. The second protrusion and the first protrusion are spaced apart from each other, and the gap between them forms a first isolation groove. The sidewall of at least one side of the first isolation groove is inclined relative to the connecting surface.

3. The ceramic component according to claim 2, characterized in that, The first isolation groove includes a triangular groove or a trapezoidal groove.

4. The ceramic component according to claim 2, characterized in that, In the wall thickness direction of the side portion, the maximum width of the first isolation groove is less than the width of the connecting surface.

5. The ceramic component according to claim 2, characterized in that, The second protrusion is located inside the first protrusion.

6. The ceramic component according to claim 5, characterized in that, The depth of the first isolation groove is h1, where 0.5mm ≤ h1 ≤ 1.5mm.

7. The ceramic component according to claim 2, characterized in that, The ceramic component includes a third protrusion that protrudes from the end face. The third protrusion and the first protrusion are spaced apart from each other, and the gap between them forms a second isolation groove. In the wall thickness direction of the side portion, the second isolation groove and the first isolation groove are located on different sides of the first protrusion. The sidewall of at least one side of the second isolation groove is inclined relative to the connecting surface.

8. The ceramic component according to claim 7, characterized in that, In the wall thickness direction of the side portion, the maximum width of the second isolation groove is less than the width of the connecting surface.

9. The ceramic component according to claim 7, characterized in that, The depth of the second isolation groove is h2, 0.5mm≤h2≤1.5mm; and / or, the height of the third protrusion is greater than or equal to the height of the first protrusion.

10. The ceramic component according to claim 1, characterized in that, The end face is flat, and the second side of the first protrusion is connected to the inner wall through the end face, so that the side of the first protrusion near the inner wall forms a first stepped groove.

11. The ceramic component according to claim 10, characterized in that, The first side is connected to the outer wall via the end face, so that the side of the first protrusion closest to the outer wall forms a second stepped groove.

12. The ceramic component according to claim 10, characterized in that, The wall thickness of the side portion is D, and the width of the connecting surface along the wall thickness direction of the side portion is W, where 2 / 3 ≤ W / D ≤ 5 / 6.

13. The ceramic component according to claim 12, characterized in that, At the end face, the distance from the first side surface to the outer wall along the wall thickness direction of the side portion is D1, 1 / 8 < D1 / D < 1 / 3; Alternatively, at the end face, the distance from the second side surface to the inner wall along the wall thickness direction of the side portion is D2, where 1 / 8 < D2 / D < 1 / 3.

14. The ceramic component according to claim 12, characterized in that, The distance from the connecting surface to the end face is H, where 1 / 8 ≤ H / W ≤ 1 / 2.

15. The ceramic component according to any one of claims 1-14, characterized in that, Both the first side and the second side are inclined relative to the connecting surface. The angle between the first side and the connecting surface ranges from 100° to 145°, and the angle between the second side and the connecting surface ranges from 100° to 145°.

16. The ceramic component according to claim 15, characterized in that, The angle between the first side surface and the end face of the side portion is equal to the angle between the second side surface and the end face of the side portion.

17. A contact cavity, characterized in that, The contact cavity includes a metal component and a ceramic component as described in any one of claims 1-16, wherein the metal component is welded to the connecting surface.

18. The contact cavity according to claim 17, characterized in that, The metal components are brazed together with the connecting surfaces.

19. A switching device, characterized in that, The switching device has a contact cavity as described in claim 17 or 18.

20. The switching device according to claim 19, characterized in that, The switching device is a relay, the ceramic component is the ceramic cover of the relay, and the metal component is the metal frame of the relay.

21. The switching device according to claim 20, characterized in that, The metal frame includes an annular body, which is sealed and welded to the connecting surface.

22. The switching device according to claim 20 or 21, characterized in that, The relay includes at least two stationary contacts, each of which is mounted on the ceramic cover, with one end of each stationary contact protruding from the inner surface of the ceramic cover and the other end protruding from the outer surface of the ceramic cover.

23. The switching device according to claim 22, characterized in that, The ceramic cover has a first through hole and a second through hole on the side opposite to the metal frame. The stationary contact includes a first stationary contact and a second stationary contact. The first stationary contact passes through the first through hole, and the second stationary contact passes through the second through hole. Both the first stationary contact and the second stationary contact are sealed and welded to the ceramic cover.

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