Ceramic component, contact cavity and switching device

Abstract

The application relates to a ceramic part, a contact cavity and a switching device, the ceramic part comprising a connecting part used for welding with a metal part, and a side surface used for welding of the connecting part is at least partially arc-shaped. The ceramic part, the contact cavity and the switching device have the side surface used for welding of the connecting part of the ceramic part being at least partially arc-shaped, so that the arc-shaped surface is used to reduce welding stress concentration, and the probability of cracking of the ceramic part is reduced, and therefore, the structure is beneficial to improving the connection reliability of the ceramic part and the metal part.

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 problem 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 connecting portion for welding to the metal component, and at least part of the surface of the connecting portion for welding is an arc surface.

[0006] In the aforementioned ceramic component, since at least part of the surface of the connecting part of the ceramic component for welding with the metal component is an arc surface, the arc surface is used to reduce the concentration of welding stress, thereby reducing the probability of cracking of the ceramic component. Therefore, this structural design is beneficial to improving the connection reliability between the ceramic component and the metal component.

[0007] Furthermore, the arc surface is a convex arc surface, which can reduce welding stress concentration and thus reduce the probability of cracking in ceramic components.

[0008] Furthermore, the side surface of the connecting portion used for welding also includes a plane, and the convex arc surface is adjacent to and protrudes from the plane. In this embodiment, since the convex arc surface is adjacent to and protrudes from the plane, when welding stress is transmitted to the convex arc surface, the convex arc surface can disperse the welding stress, thereby reducing the probability of cracking at the corners of the ceramic component due to excessive stress.

[0009] Furthermore, the welding-compatible surface of the connecting portion includes a first convex arc surface, a second convex arc surface, and a connecting surface. The connecting surface connects the first convex arc surface and the second convex arc surface, and is recessed relative to the first and second convex arc surfaces to jointly form a groove. In this way, not only can the first and second convex arc surfaces be used to reduce the stress transmitted to the corners of the ceramic cover, thus reducing the probability of cracking due to stress concentration, but the groove can also be used to collect the solder flowing along the end face of the connecting end during welding, thereby reducing the probability of solder flowing to the corners of the ceramic cover and causing cracking at the corners under the high temperature of the solder.

[0010] Furthermore, the first convex arc surface and / or the second convex arc surface are used for welding with the metal component. In this way, the first convex arc surface and / or the second convex arc surface, as the welding position with the metal component, can disperse the welding stress, thereby reducing the probability of the ceramic cover cracking due to stress concentration.

[0011] Furthermore, the groove is used to contain solder, allowing the ceramic component to be welded to the metal component via the solder located within the groove. Thus, during the welding process, the solder remains within the groove and is less likely to overflow, reducing the amount of solder flowing to the corners of the ceramic cover and consequently lowering the probability of cracking at the corners of the ceramic cover under the high temperature of the solder.

[0012] Furthermore, both the first and second convex arc surfaces are smoothly connected to the connecting surface, thereby reducing sharp edges and further reducing the probability of stress concentration.

[0013] Furthermore, the connecting surface includes a flat surface or a concave arc surface. The flat surface or concave arc surface itself has the effect of resisting stress concentration, so that when welding stress is applied to the static flat surface or concave arc surface, cracking is less likely to occur at the connecting surface.

[0014] Furthermore, the central angle of the arc corresponding to the first convex arc surface is 30°~75°, making the first convex arc surface large enough to disperse welding stress without being too large and occupying the space for the concave arc surface. The central angle of the arc corresponding to the second convex arc surface is 30°~75°, making the second convex arc surface large enough to disperse welding stress without being too large and occupying the space for the concave arc surface.

[0015] On the other hand, this application provides a contact cavity, the contact cavity including a metal component and a ceramic component as described above, wherein the metal component is welded to the connecting portion of the ceramic component.

[0016] Because the surface of the ceramic component's connecting part for welding to the metal component is at least partially curved, the curved surface reduces stress concentration during welding, thus lowering the likelihood of cracking in the ceramic component. Therefore, the connection between the ceramic and metal components in this contact cavity is reliable. Furthermore, the metal and ceramic components are brazed together, further improving the sealing between them.

[0017] On the other hand, this application provides a switching device including the contact cavity as described above.

[0018] Because the arc surface reduces welding stress concentration when the metal and ceramic components are welded together in the contact cavity, it lowers the probability of cracking in the ceramic component. Therefore, switching devices using this type of contact cavity have good reliability.

[0019] 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. Since the ceramic component is not prone to cracking, the connection between the ceramic cover and the metal frame in this embodiment is reliable.

[0020] Furthermore, the side surface of the connecting part used for welding is smoothly connected to the outer wall of the ceramic cover, so that the connection between the end face and the outer wall is smooth and without obvious boundary edges, which helps to reduce the probability of stress concentration.

[0021] Furthermore, the side surface of the connecting part used for welding is smoothly connected to the inner wall of the ceramic cover, so that the connection between the end face and the inner wall is smooth and without obvious boundary edges, which helps to reduce the probability of stress concentration.

[0022] Furthermore, the metal frame is sealed and welded to the connecting part, thereby achieving good sealing between the two.

[0023] Furthermore, the welding point between the metal frame and the connecting part is located on the arc surface. This allows for line welding to the metal frame using the arc surface, which reduces the welding area compared to surface welding, thereby lowering welding stress. Moreover, the arc surface also disperses stress, reducing stress concentration and thus lowering the likelihood of cracking in the ceramic cover.

[0024] Furthermore, the metal frame includes an annular body, which is sealed and welded to the connecting part, thereby achieving a seal at the connection between the metal frame and the ceramic cover.

[0025] Furthermore, the metal frame includes an annular body and an inner folded edge. The inner folded edge is connected to the end of the annular body facing the ceramic cover and is bent inward relative to the annular body. The inner folded edge is sealed and welded to the connecting part. Thus, the sealing of the connection between the metal frame and the ceramic cover is achieved by sealing and welding the inner folded edge to the connecting part.

[0026] Furthermore, the relay includes a yoke assembly, and the metal frame includes an outwardly bent edge. This outwardly bent edge is connected to the end of the annular body facing away from the ceramic cover and is bent outward relative to the annular body. The outwardly bent edge is sealed and welded to the yoke assembly. Thus, the sealing of the connection between the metal frame and the yoke assembly is achieved by sealing the outwardly bent edge with the yoke assembly, thereby improving the overall sealing performance of the contact cavity and providing a good sealing environment for the contact portion of the relay.

[0027] 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. Because both the first and second stationary contacts are sealed and welded to the ceramic cover, the contact cavity can provide a sealed environment for the parts of the first stationary contact, the second stationary contact, and the moving contact piece that come into contact. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a relay in one embodiment.

[0029] Figure 2 This is a partial structural cross-sectional view of a relay in one embodiment.

[0030] Figure 3 This is a schematic diagram of the contact cavity of a relay in one embodiment.

[0031] Figure 4 This is a schematic diagram of the exploded structure of the contact cavity of a relay in one embodiment.

[0032] Figure 5 This is a cross-sectional structural diagram of the contact cavity of a relay in one embodiment.

[0033] Figure 6 In one implementation, the relay corresponds to Figure 5 A magnified view of the structure within the middle circle.

[0034] Figure 7 In another embodiment, the corresponding relay Figure 5 A magnified view of the structure within the middle circle.

[0035] Figure 8 In another embodiment, the relay corresponds to Figure 5 A magnified view of the structure within the middle circle.

[0036] Figure 9 In another implementation, the relay corresponds to Figure 5 A magnified view of the structure within the middle circle.

[0037] Figure 10 This is a cross-sectional view of the contact cavity of the relay in another embodiment.

[0038] Figure 11 for Figure 10 A cross-sectional schematic diagram of the contact cavity of a medium relay.

[0039] Figure 12 In another embodiment, the corresponding relay Figure 11 A magnified view of the structure within the middle circle.

[0040] Figure 13 In another embodiment, the relay corresponds to Figure 11 A magnified view of the structure within the middle circle.

[0041] Figure label:

[0042] 100. Relay;

[0043] 10. Contact part; 11. First stationary contact; 12. Second stationary contact; 13. Moving contact piece;

[0044] 20. Actuating mechanism; 21. Actuating seat; 22. Actuating lever;

[0045] 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;

[0046] 40. Contact cavity; 41. Ceramic cover; 41a. First through hole; 41b. Second through hole; 41c. Groove; 411. Connecting end; 411a. Arc surface; 411b. First convex arc surface; 411c. Second convex arc surface; 413. Outer wall; 414. Inner wall; 42. Metal frame; 421. Annular body; 422. Outer folded edge; 423. Inner folded edge;

[0047] 50. Metal casing. Detailed Implementation

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] In response, the inventors discovered through research that the most prone 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 risk locations in the ceramic component, thereby reducing the likelihood of cracking affecting the reliability of the switching device.

[0056] For ease of understanding, the following explanation will use a relay as an example. Similarly, the technical solutions for solving the problem of cracking of ceramic components during the welding process in other switching devices such as vacuum interrupters can also refer to the relay technical solutions below.

[0057] 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.

[0058] 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. Correspondingly, 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.

[0059] The number of stationary contacts can also be two or more; there is no limit to the number of stationary contacts.

[0060] 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.

[0061] To facilitate understanding, the contact cavity 40, including the ceramic cover 41 and the metal frame 42, will be further explained below.

[0062] Combination Figure 3 and Figure 4 As shown, the ceramic cover 41 is 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 between them.

[0063] Understandably, if a ceramic component is connected to a metal component, it means that the ceramic component has a connecting portion for connecting to the metal component. In this embodiment, the connecting portion is welded to the metal component.

[0064] It should be noted that the ceramic cover 41, as a cover structure, has an open end and a closed end. In this embodiment, the metal frame 42 is connected to the open end (hereinafter referred to as the "connecting end 411"). That is, the ceramic cover 41 includes the connecting end 411, which serves as the connecting part for connecting the ceramic cover 41 to the metal frame 42. Understandably, in this embodiment, the connecting end 411 refers to the end of the ceramic cover 41 used for connecting to the metal frame 42. The surface of the connecting end 411 facing the metal frame 42 is referred to as the end face of the connecting end 411; specifically, the metal frame 42 is connected to the end face of the connecting end 411.

[0065] Combination Figure 5 and Figure 6 As shown, the end face of the connecting end 411 is at least partially an arc surface 411a. In some embodiments, the metal frame 42 is sealed and welded to the arc surface 411a, that is, the welding point between the metal frame 42 and the connecting end 411 is located on the arc surface 411a. Thus, line welding with the metal frame 42 is achieved using the arc surface 411a. Compared to surface welding, this arrangement reduces the welding area, thereby reducing welding stress. Furthermore, the arc surface 411a can also disperse stress, reducing welding stress concentration and thus lowering the probability of cracking in the ceramic cover 41. Therefore, this structural arrangement is beneficial for improving the sealing performance of the contact cavity 40.

[0066] It should be noted that the arc surface 411a can be either a convex arc surface or a concave arc surface.

[0067] For example, combining Figure 6 and Figure 7 As shown, arc surface 411a is a convex arc surface, and the central angle γ of the arc corresponding to the convex arc surface is 120°~180°. The central angle γ can be 120°, 130°, 140°, 150°, 160°, 170° or 180°, and is not limited here.

[0068] In this embodiment, the central angle γ of the arc corresponding to the convex surface is 120°~180°, that is, the central angle γ of the arc corresponding to the convex surface is greater than or equal to 120° and less than or equal to 180°. Understandably, when the central angle γ of the arc corresponding to the convex surface is 180°, the convex surface is a semi-cylindrical surface, that is, the three-dimensional shape enclosed by the convex surface is a semi-cylindrical body.

[0069] For an arc surface 411a with a predetermined radius, the larger the central angle of the arc corresponding to the arc surface 411a, the larger the area of ​​the arc surface 411a. Therefore, in this embodiment, the central angle γ of the arc corresponding to the convex arc surface is set to be greater than or equal to 120°. Within this angle range, the central angle of the arc corresponding to the convex arc surface is large enough so that the convex arc surface provides a sufficiently large area to meet the sealing welding requirements with the metal frame 42. At the same time, the large area of ​​the convex arc surface is also beneficial to disperse welding stress, thereby reducing the probability of stress concentration and cracking at the connection end 411 of the ceramic cover 41.

[0070] Furthermore, since the central angle γ of the arc corresponding to the convex arc surface is less than or equal to 180°, it is convenient to demold when the convex arc surface is processed at the connecting end 411 of the ceramic cover 41 by molding.

[0071] The end face of the connecting end 411 is smoothly connected to the outer wall 413 of the ceramic cover 41, so that the connection between the end face and the outer wall 413 is smooth and without obvious boundary edges, which helps to reduce the probability of stress concentration.

[0072] The end face of the connecting end 411 is smoothly connected to the inner wall 414 of the ceramic cover 41, so that the connection between the end face and the inner wall 414 is smooth and without obvious boundary edges, which helps to reduce the probability of stress concentration.

[0073] Furthermore, such as Figure 6 As shown, taking the arc surface 411a as a convex arc surface as an example, the convex arc surface is smoothly connected to the outer wall 413 of the ceramic cover 41, which helps to enhance the structural strength between the convex arc surface and the outer wall 413 of the ceramic cover 41, thereby reducing the probability of cracking.

[0074] In some embodiments, the convex arc surface is smoothly connected to the inner wall 414 of the ceramic cover 41 to enhance the structural strength between the convex arc surface and the inner wall 414 of the ceramic cover 41, thereby reducing the probability of cracking.

[0075] It should be noted that, in this application, a smooth connection between two surfaces refers to a smooth connection between the two surfaces without obvious boundary edges, which can further reduce the probability of stress concentration.

[0076] Combination Figure 8As shown, in some embodiments, the arc surface 411a is a concave arc surface, and the space enclosed by the concave arc surface can accommodate solder. The concave arc surface is sealed and welded to the metal frame 42 by the solder. In this way, the space enclosed by the concave arc surface can be used to place the solder, so that the solder is less likely to overflow during the welding process between the metal frame 42 and the end face of the connecting end 411, and the bonding force between the solder and the concave arc surface is enhanced, making the weld between the metal frame 42 and the ceramic cover 41 less likely to loosen, thus improving the welding effect. In addition, the setting of the concave arc surface can also play a role in dispersing welding stress, thereby reducing the probability of cracking of the ceramic cover 41 due to stress concentration.

[0077] Furthermore, combined Figure 8 As shown, in some embodiments, the end face of the connecting end 411 further includes a first convex arc surface 411b and a second convex arc surface 411c, with a concave arc surface smoothly connected between the first convex arc surface 411b and the second convex arc surface 411c. Thus, the concave arc surface can transfer welding stress to the first convex arc surface 411b and the second convex arc surface 411c, further dispersing the welding stress and reducing the probability of cracking of the ceramic cover 41 due to stress concentration. This improves welding sealing and enhances the sealing performance of the contact cavity 40.

[0078] In this embodiment, the arc surface 411a is a concave arc surface, and the concave arc surface, as the surface connecting the first convex arc surface 411b and the second convex arc surface 411c, can be called a "connecting surface". In some embodiments, the connecting surface between the first convex arc surface 411b and the second convex arc surface 411c (corresponding to the position of the arc surface 411a) is not limited to a concave arc surface, but can also be a plane or other types of surface.

[0079] Specifically, continue to combine Figure 8 As shown, the end face of the connecting end 411 includes a first convex arc surface 411b, a second convex arc surface 411c, and a connecting surface (at the position corresponding to the arc surface 411a). The connecting surface is connected between the first convex arc surface 411b and the second convex arc surface 411c. The connecting surface is recessed relative to the first convex arc surface 411b and the second convex arc surface 411c to jointly enclose and form a groove 41c.

[0080] Furthermore, both the first convex arc surface 411b and the second convex arc surface 411c are smoothly connected to the connecting surface, thereby reducing sharp edges and further reducing the probability of stress concentration.

[0081] The metal frame 42 is not limited to being connected to the connecting surface (corresponding to the position of the arc surface 411a). In some embodiments, the metal frame 42 can also be welded to the first convex arc surface 411b or the second convex arc surface 411c. In this case, the first convex arc surface 411b and the second convex arc surface 411c can still disperse the welding stress and reduce the probability of the ceramic cover 41 cracking due to stress concentration.

[0082] In this embodiment, not only can the first convex arc surface 411b and the second convex arc surface 411c be used to reduce the stress transmitted to the corner of the ceramic cover 41, thereby reducing the probability of the ceramic cover 41 cracking due to stress concentration, but also the groove 41c can be used to contain the solder flowing along the end face of the connection end 411 during the welding process, thereby reducing the probability of the solder flowing to the corner of the ceramic cover 41 and causing the corner to crack under the action of the high temperature of the solder.

[0083] It should be noted that the groove 41c is not limited to collecting flowing solder; it can also be used to hold solder for welding. For example, the groove 41c is used to contain solder, and the ceramic cover 41 can be welded to the metal frame 42 through the solder located in the groove 41c. In this way, during the welding process, the solder is located in the groove 41c and is less likely to overflow, thereby reducing the amount of solder flowing to the corners of the ceramic cover 41, and thus reducing the probability of cracking at the corners of the ceramic cover 41 under the high temperature of the solder.

[0084] In this embodiment of the application, the corner of the ceramic cover 41 can be understood as the connection position between the end face of the connecting end 411 and the inner wall 414 or the outer wall 413 of the ceramic cover 41.

[0085] Combination Figure 9 As shown, the central angle α of the arc corresponding to the first convex arc surface 411b is 30°~75°. The specific central angle α can be 30°, 40°, 50°, 55°, 60°, 70° or 75°, and is not limited here.

[0086] The central angle β of the arc corresponding to the second convex arc surface 411c is 30°~75°. The specific central angle β can be 30°, 40°, 50°, 55°, 60°, 70° or 75°, and is not limited here.

[0087] In the above embodiments, by controlling the central angle α of the arc corresponding to the first convex arc surface 411b to be between 30° and 75°, the first convex arc surface 411b is large enough to disperse welding stress without being too large and occupying the space for the concave arc surface. Correspondingly, by controlling the central angle β of the arc corresponding to the second convex arc surface 411c to be between 30° and 75°, the second convex arc surface 411c is large enough to disperse welding stress without being too large and occupying the space for the concave arc surface.

[0088] The first convex arc surface 411b is smoothly connected to the outer wall 413 of the ceramic cover 41, which helps to enhance the structural strength between the first convex arc surface 411b and the outer wall 413 of the ceramic cover 41, thereby reducing the probability of cracking.

[0089] The second convex arc surface 411c is smoothly connected to the inner wall 414 of the ceramic cover 41, which helps to enhance the structural strength between the second convex arc surface 411c and the outer wall 413 of the ceramic cover 41, thereby reducing the probability of cracking.

[0090] In some embodiments, the side surface of the connecting end 411 used for welding also includes a flat surface (not shown), with the convex arc surface adjacent to and protruding from the flat surface. In this embodiment, whether the metal frame 42 is welded to the convex arc surface or the metal frame 42 is welded to the flat surface, the corresponding position of the convex arc surface can eliminate the stress transmission to the corners of the ceramic cover 41 during the welding process, thereby reducing the probability of cracking of the ceramic cover 41.

[0091] It should be noted that the structure of the metal frame 42 has multiple implementations.

[0092] For example, combining Figure 5 and Figure 6 As shown, in some embodiments, the metal frame 42 includes an annular body 421, which is sealed and welded to the arc surface 411a.

[0093] Combination Figure 6 and Figure 8 As shown, regardless of whether the arc surface 411a is convex or concave, the annular body 421 can distribute the welding stress to the arc surface 411a by sealing it with the arc surface 411a. This reduces stress concentration by utilizing the arc surface 411a, thereby reducing the probability of cracking in the ceramic cover 41.

[0094] For example, combining Figures 10 to 12 As shown, in some embodiments, the metal frame 42 includes an inner folded edge 423. The inner folded edge 423 is connected to one end of the annular body 421 facing the ceramic cover 41 and is bent inward relative to the annular body 421. In this embodiment, the inner folded edge 423 is sealed and welded to the arc surface 411a, thus achieving a sealed end face connection between the metal frame 42 and the connecting end 411.

[0095] Combination Figure 12 and Figure 13 As shown, regardless of whether the arc surface 411a is convex or concave, the inner folded edge 423 can be sealed and welded to the arc surface 411a to disperse the welding stress to the arc surface 411a. This reduces stress concentration by utilizing the arc surface 411a, thereby reducing the probability of cracking in the ceramic cover 41.

[0096] 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.

[0097] For example, in some implementations, it is combined again. Figure 2As 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.

[0098] It should be noted that the moving contact 13 and the push base 21 can be indirectly connected or directly connected, and no limitation is made here.

[0099] 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.

[0100] 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. The moving iron core 32 is disposed in the mounting hole and connected to the end of the push rod 22 away from the push base 21. In the electromagnetic field generated by the energization of the coil 311, the moving iron core 32 attracts the stationary magnet 33, thereby enabling the moving iron core 32 to move within the mounting hole in the direction close to the stationary magnet 33.

[0101] In some embodiments, the stationary magnet 33 includes a yoke plate 331.

[0102] 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.

[0103] 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.

[0104] 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 end 411 of the ceramic cover 41, and the other end is sealed to the yoke plate 331.

[0105] 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.

[0106] It should be noted that the connecting end 411 of the ceramic cover 41 is in a closed loop shape on one side, thus forming a space for accommodating the contact portion 10. The annular body 421 serves as a structural component connected to the ceramic cover 41, and its annular shape ensures a sealed connection with the connecting end 411 of the ceramic cover 41. 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 bends. The shape of the annular body 421 is not limited here, as long as it meets the requirements for a sealed connection with the ceramic cover 41.

[0107] 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.

[0108] The ceramic cover 41 includes a connected side and a top, with the connecting end 411 being the end of the side farther from the top. For example... 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.

[0109] It should be noted that, since the first stationary contact 11 passes through the first through hole 41a and the second stationary contact 12 passes 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 the external controlled object. Simultaneously, the first stationary contact 11 and the second stationary contact 12 respectively penetrate from the first through hole 41a and the second through hole 41b into the interior of the ceramic cover 41, 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.

[0110] In some embodiments, the magnetic circuit portion 30 includes a yoke assembly. The metal frame 42 includes an outer flange 422, which 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 outer flange 422 is used for sealing welding with the yoke assembly.

[0111] See again Figure 1 As shown, in some embodiments, the yoke assembly may include a yoke plate 331 and a U-shaped yoke 35. The yoke plate 331 is connected to both ends of the U-shaped yoke 35 to enclose and form an installation space. The coil 311 is located 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 away from the moving contact 13 passes through the yoke plate 331 and is connected to the moving iron core 32.

[0112] Combination Figure 2 and Figure 3 As shown, in some embodiments, the outer folded edge 422 is sealed and welded to the yoke plate 331. The setting of the outer folded edge 422 can increase the connection area between the metal frame 42 and the yoke plate 331, thereby improving the welding sealing performance.

[0113] Continue reading Figure 2 As 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.

[0114] 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.

[0115] 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, and the perforation 331a on the yoke plate 331 corresponds to the interior of the metal housing 50. Thus, the metal housing 50 seals the area around the perforation 331a. Therefore, 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.

[0116] The sealing connection between the metal shell 50 and the yoke plate 331 includes, but is not limited to, welding or glue connection.

[0117] 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.

[0118] 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 sleeved on the outside of the metal housing 50 together with the coil frame 312, so that the coil 311 can magnetize the moving iron core 32 located inside the metal housing 50 after being energized.

[0119] Of course, in the embodiment where the static conductor 33 includes the static iron core 332, the magnetic lines of force generated after the coil 311 is energized can also be transmitted to the static iron core 332 through the yoke plate 331, so that the moving iron core 32 magnetically attracts the static iron core 332, thereby driving the push rod 22 to move the push seat 21 toward the side where the first static contact 11 and the second static contact 12 are located, and then the moving contact piece 13 contacts the first static contact 11 and the second static contact 12, so as to electrically connect the first static contact 11 and the second static contact 12 using the moving contact piece 13.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] 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 connecting portion for welding to the metal component, wherein at least part of the surface of the connecting portion used for welding is an arc surface.

2. The ceramic component according to claim 1, characterized in that, The arc surface includes a convex arc surface.

3. The ceramic component according to claim 2, characterized in that, The side surface of the connection for welding also includes a plane, and the convex arc surface is adjacent to the plane and protrudes from the plane.

4. The ceramic component according to claim 1, characterized in that, The side surface of the connecting part used for welding includes a first convex arc surface, a second convex arc surface, and a connecting surface. The connecting surface is connected between the first convex arc surface and the second convex arc surface. The connecting surface is recessed relative to the first convex arc surface and the second convex arc surface to jointly enclose and form a groove.

5. The ceramic component according to claim 4, characterized in that, The first convex arc surface and / or the second convex arc surface are used for welding to the metal component; And / or, the groove is used to contain solder, and the ceramic component can be welded to the metal component by solder located within the groove.

6. The ceramic component according to claim 4 or 5, characterized in that, Both the first convex arc surface and the second convex arc surface are smoothly connected to the connecting surface; And / or, the connecting surface includes a plane or a concave arc surface.

7. The ceramic component according to claim 4 or 5, characterized in that, The central angle of the arc corresponding to the first convex surface is 30°~75°, and the central angle of the arc corresponding to the second convex surface is 30°~75°.

8. A contact cavity, characterized in that, The contact cavity includes a metal component and a ceramic component as described in any one of claims 1-7, wherein the metal component is welded to the connecting portion of the ceramic component.

9. The contact cavity according to claim 8, characterized in that, The metal component and the ceramic component are brazed together.

10. A switching device, characterized in that, The switching device has a contact cavity as described in claim 8 or 9.

11. The switching device according to claim 10, 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.

12. The switching device according to claim 11, characterized in that, The side surface of the connecting part used for welding is smoothly connected to the outer wall of the ceramic cover; and / or, the side surface of the connecting part used for welding is smoothly connected to the inner wall of the ceramic cover.

13. The switching device according to claim 11, characterized in that, The metal frame is sealed and welded to the connecting part, and / or the welding point between the metal frame and the connecting part is located on the arc surface.

14. The switching device according to claim 12 or 13, characterized in that, The metal frame includes an annular body, which is sealed and welded to the connecting part. Alternatively, the metal frame includes an annular body and an inner folded edge, the inner folded edge being connected to one end of the annular body facing the ceramic cover and bent inward relative to the annular body, the inner folded edge being sealed and welded to the connecting portion.

15. The switching device according to claim 14, characterized in that, The relay includes a yoke assembly, and the metal frame includes an outer flange. The outer flange is connected to one end of the annular body facing away from the ceramic cover and is bent outward relative to the annular body. The outer flange is sealed and welded to the yoke assembly.

16. The switching device according to claim 15, characterized in that, The relay includes at least two stationary contacts, each of which is mounted on the ceramic cover. One end of each stationary contact protrudes from the inner surface of the ceramic cover, and the other end protrudes from the outer surface of the ceramic cover.

17. The switching device according to claim 16, 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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