Ceramic components, contact cavities and switching devices

Abstract

This application relates to a ceramic component, a contact cavity, and a switching device. The ceramic component is suitable for connection with a metal component in a switching device. The ceramic component includes a ceramic body and a reinforcing member. The reinforcing member is disposed on the end face of the ceramic body, and the side of the reinforcing member facing away from the end face is used for welding the metal component. The ceramic component, contact cavity, and switching device of this application utilize the reinforcing member to protect the end face of the ceramic body, preventing welding stress from acting on the end face of the ceramic body and causing cracking of the overall structure of the ceramic body. Moreover, even if the reinforcing member cracks, it can prevent the crack from continuing to propagate to the ceramic body, thereby reducing the probability of further cracking of the ceramic body and allowing the ceramic body to maintain good structural strength.

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, during the welding process of ceramic cover and metal frame, the ceramic cover, as a ceramic component, is susceptible to cracking due to welding stress. Once cracking occurs, the cracks can easily spread, resulting in poor overall structural strength of the ceramic cover and thus affecting 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 how to reduce the probability of crack propagation when a ceramic component cracks in order to maintain the overall structural strength of the ceramic component.

[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 ceramic body and a reinforcing member. The reinforcing member is disposed on the end face of the ceramic body, and the side of the reinforcing member facing away from the end face is used for welding the metal component.

[0006] In the ceramic component of this application, since the reinforcing member is located on the end face of the ceramic body, and the side of the reinforcing member facing away from the end face is used for welding metal components, the reinforcing member provides a protective effect on the end face of the ceramic body compared to directly welding the metal frame to the end face of the ceramic body. This prevents welding stress from acting on the end face of the ceramic body and causing cracks in the overall structure of the ceramic body. Moreover, even if the reinforcing member cracks, it can prevent the crack from continuing to propagate to the ceramic body, thereby reducing the probability of further cracking of the ceramic body and enabling the ceramic body to maintain good structural strength.

[0007] Furthermore, the material hardness of the reinforcing member is higher than that of the ceramic body, and / or the reinforcing member is sheet-shaped. Because the material hardness of the reinforcing member is higher than that of the ceramic body, welding the metal component to the side of the reinforcing member away from the end face of the reinforcing member, compared to directly welding the metal component to the end face of the ceramic body, can utilize the higher hardness of the reinforcing member to reduce the probability of cracking, making the ceramic component less prone to cracking overall, thus maintaining good structural strength. In addition, when the reinforcing member is sheet-shaped, it helps maintain a tight connection with the end face.

[0008] Furthermore, the reinforcing member is made of ceramic. Thus, the reinforcing member can be formed onto the end face of the ceramic body using a casting process.

[0009] Furthermore, a groove is formed on the end face of the ceramic body, and the reinforcing member is disposed in the groove. In this embodiment, using a groove to house the reinforcing member helps to enhance the bonding stability between the reinforcing member and the ceramic body. Moreover, when the reinforcing member is manufactured using a ceramic material casting process, the ceramic material can be cast into the groove, thereby reducing the probability of ceramic material overflow.

[0010] Furthermore, the end face of the ceramic body is planar, and the groove includes a first sidewall and a second sidewall disposed opposite to each other, at least one of the first sidewall and the second sidewall being inclined relative to the end face of the ceramic body. Thus, the inclined first and second sidewalls can further reduce the probability of stress concentration and cracking in the ceramic body.

[0011] Furthermore, the included angle between at least one of the first and second sidewalls and the end face of the ceramic body ranges from 100° to 145°; and / or, the included angle between the first and second sidewalls ranges from 30° to 60°. The included angle between at least one of the first and second sidewalls and the end face of the ceramic body, ranging from 100° to 145°, reduces the probability of cracking due to stress concentration while also reducing the amount of solder used, thus lowering production costs. Controlling the included angle between the first and second sidewalls within the range of 30° to 60° ensures a suitable angle for dispersing welding stress.

[0012] Furthermore, the groove wall is at least partially curved. This curved surface helps to disperse welding stress, reducing stress concentration and further lowering the likelihood of cracking in the ceramic body.

[0013] Furthermore, both the reinforcing member and the ceramic body have inner and outer walls arranged opposite to each other. The outer wall of the reinforcing member is flush with the outer wall of the ceramic body, and / or, the inner wall of the reinforcing member is flush with the inner wall of the ceramic body. In this embodiment, when the outer wall of the reinforcing member is flush with the outer wall of the ceramic body, the reinforcing member can cover the corners of the outer wall of the ceramic body. Therefore, under the reinforcing effect of the reinforcing member, the corners of the outer wall of the ceramic body are less prone to cracking, thereby reducing the probability of cracking in the ceramic body. When the inner wall of the reinforcing member is flush with the inner wall of the ceramic body, the reinforcing member can cover the corners of the inner wall of the ceramic body. Therefore, under the reinforcing effect of the reinforcing member, the corners of the inner wall of the ceramic body are less prone to cracking, thereby reducing the probability of cracking in the ceramic body.

[0014] 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 reinforcing member. In this embodiment, when the metal component is welded to the reinforcing member, the reinforcing member can be used to reduce the probability of cracking in the ceramic component.

[0015] Furthermore, the metal component and the reinforcing member are brazed together. In this embodiment, the brazing connection between the metal component and the reinforcing member improves the sealing performance between them.

[0016] Furthermore, this application provides a switching device, which includes the contact cavity described above. In this switching device, when the metal component is welded to the reinforcing member, the reinforcing member can be used to reduce the probability of cracking in the ceramic component.

[0017] 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, a reinforcing member is used to reduce the probability of cracking in the ceramic component.

[0018] Furthermore, the metal frame includes an annular body, which is sealed and welded to the reinforcing member. During the sealing and welding of the annular body and the reinforcing member, the reinforcing member withstands the welding stress and is not easily cracked due to the welding stress. Consequently, the reinforcing member provides enhanced protection for the ceramic body, reducing the probability of cracking of the ceramic cover and thus improving the sealing performance of the contact cavity.

[0019] Furthermore, the ceramic cover includes a connected side portion and a top portion. The wall thickness of the side portion is D, and the width of the reinforcing member along the wall thickness direction of the side portion is W1, where 1 / 2 ≤ W1 / D ≤ 2 / 3. On one hand, 1 / 2 ≤ W1 / D ensures that the area of ​​the reinforcing member covering the end face of the ceramic body is large enough to provide reinforcement and reduce the probability of cracking in the ceramic body. Simultaneously, since W1 / D ≤ 2 / 3, the reinforcing member does not need to completely cover the end face of the ceramic body, thus saving material usage.

[0020] Furthermore, the metal frame includes an annular body, the distance from the annular body along the wall thickness direction of the side portion to the inner wall of the reinforcing member is W2, where 1 / 3 ≤ W2 / W1 ≤ 2 / 3. With this structural arrangement, the sealing welding position of the annular body on the reinforcing member is nearly centered, thereby facilitating a larger welding area for sealing welding between the reinforcing member and the annular body.

[0021] Furthermore, along the wall thickness direction of the side portion, the distance between the outer wall of the reinforcing member and the outer wall of the side portion is W3, where 2mm≤D≤4mm, 0mm≤W3≤0.5mm. Thus, the reinforcing member can either completely cover the corners of the outer wall of the side portion of the ceramic body, or it can not cover the corners of the outer wall of the side portion of the ceramic body, ensuring that the portion of the corners of the outer wall of the side portion of the ceramic body exposed from the reinforcing member does not exceed 0.5mm. This facilitates ensuring the overall coverage area of ​​the reinforcing member on the end face of the ceramic body, thereby simplifying the sealing welding of the reinforcing member to the annular body.

[0022] 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.

[0023] 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

[0024] Figure 1 This is a schematic diagram of the structure of a relay in one embodiment.

[0025] Figure 2 This is a partial structural cross-sectional view of a relay in one embodiment.

[0026] Figure 3 This is a schematic diagram of the contact cavity of a relay in one embodiment.

[0027] Figure 4 This is a schematic diagram of the exploded structure of the contact cavity of a relay in one embodiment.

[0028] Figure 5 This is a cross-sectional structural diagram of the contact cavity of a relay in one embodiment.

[0029] Figure 6 In one implementation, the relay corresponds to Figure 5 A magnified view of the structure within the middle circle.

[0030] Figure 7 In another embodiment, the corresponding relay Figure 5A magnified view of the structure within the middle circle.

[0031] Figure 8 In another embodiment, the relay corresponds to Figure 5 A magnified view of the structure within the middle circle.

[0032] Figure 9 In another implementation, the relay corresponds to Figure 5 A magnified view of the structure within the middle circle.

[0033] Figure 10 In another implementation, the corresponding relay Figure 5 A magnified view of the structure within the middle circle.

[0034] Figure label:

[0035] 100. Relay; 10. Contact part; 11. First stationary contact; 12. Second stationary contact; 13. Moving contact; 20. Pushing mechanism; 21. Pushing base; 22. Pushing rod; 30. Magnetic circuit part; 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; 40. Contact cavity; 41. Ceramic cover; 41a. First through hole; 41b. Second through hole; 411. Ceramic body; 411a. End face; 411b. Outer wall; 411c. Inner wall; 412. Reinforcing member; 4111. Groove; 4111a. First side wall; 4111b. Second side wall; 42. Metal frame; 421. Ring-shaped body; 422. Folded edge; 50. Metal shell. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] In response, the inventors discovered through research that cracking in ceramic components is most likely to occur at the edges and where the ceramic component joins with the metal component. Furthermore, once a crack appears in the ceramic component, the crack tends to propagate, resulting in poor overall structural strength of the ceramic cover. To address this, the inventors proposed relevant technical methods to solve the problem of how to reduce the probability of crack propagation when a crack appears in the ceramic component, thereby maintaining the overall structural strength of the ceramic component.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] The number of stationary contacts can also be two or more; there is no limit to the number of stationary contacts.

[0048] 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.

[0049] 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.

[0050] Combination Figures 3 to 6 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.

[0051] The ceramic cover 41 includes a ceramic body 411 and a reinforcing member 412, with the reinforcing member 412 disposed on the end face 411a of the ceramic body 411.

[0052] 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 body 411 of the ceramic cover 41 includes a connected side and a top, and in this embodiment, the end face 411a is the surface of the side that is farther from the top.

[0053] The side of the reinforcing member 412 facing away from the end face 411a is used for welding the metal frame 42. Compared with directly welding the metal frame 42 to the end face 411a of the ceramic body 411, the reinforcing member 412 provides protection for the end face 411a of the ceramic body 411, avoiding the welding stress acting on the end face 411a of the ceramic body 411 and causing cracks in the overall structure of the ceramic body 411; moreover, even if the reinforcing member 412 cracks, it can prevent the crack from continuing to propagate to the ceramic body 411, thereby reducing the probability of the ceramic body 411 continuing to crack, so that the ceramic body 411 can still maintain good structural strength.

[0054] The material hardness of the reinforcing member 412 is higher than that of the ceramic body 411. Because the material hardness of the reinforcing member 412 is higher than that of the ceramic body 411, and the metal frame 42 is directly welded to the end face 411a of the ceramic body 411, the reinforcing member 412 is less likely to crack due to welding stress, thus making the ceramic cover 41 less prone to cracking as a whole, thereby maintaining good structural strength.

[0055] In some embodiments, the metal frame 42 is sealed and welded to the reinforcement 412. Since the reinforcement 412 reduces the probability of cracking of the ceramic body 411, it helps to maintain the sealing performance of the contact cavity 40.

[0056] It should be noted that when the material hardness of the reinforcing member 412 is higher than that of the ceramic body 411, the reinforcing member 412 is less prone to cracking due to welding stress, thus the ceramic cover 41 as a whole is less prone to cracking, maintaining good structural strength. Therefore, the sealing performance of the contact cavity 40 is further improved.

[0057] The shape of the reinforcing member 412 is not limited here. It is acceptable as long as the reinforcing member 412 can be adapted to connect with the ceramic body 411 and the metal frame 42. For example, in some embodiments, the reinforcing member 412 may be sheet-shaped. Thus, when the reinforcing member 412 is connected to the end face 411a, the sheet-shaped reinforcing member 412 helps maintain a tight connection with the end face 411a.

[0058] The metal frame 42 includes an annular body 421, which is sealed and welded to the reinforcing member 412. It should be noted that the end face 411a of the ceramic body 411 is the surface of the ceramic body 411 facing the metal frame 42. This surface can be a plane or a non-plane with recesses, which is not limited here.

[0059] In the above embodiment, since a reinforcing member 412 is provided on the end face 411a of the ceramic body 411, the reinforcing member 412 can withstand welding stress and is not easy to crack due to welding stress when the annular body 421 and the reinforcing member 412 are sealed and welded. As a result, the reinforcing member 412 can strengthen and protect the ceramic body 411, reduce the probability of cracking of the ceramic body 411, and thus improve the sealing performance of the contact cavity 40.

[0060] In some embodiments, the reinforcing member 412 is made of ceramic. It should be noted that the hardness of the ceramic material of the reinforcing member 412 is higher than that of the ceramic material of the ceramic body 411. Thus, the reinforcing member 412 can be formed onto the end face 411a of the ceramic body 411 by tape casting. Because the hardness of the ceramic material of the reinforcing member 412 is higher than that of the ceramic material of the ceramic body 411, and because it is directly welded to the end face 411a of the ceramic body 411 relative to the metal frame 42, this application uses welding to seal the metal frame 42 and the reinforcing member 412, making the reinforcing member 412 less prone to cracking due to welding stress.

[0061] Combination Figure 7 As shown, both the reinforcing member 412 and the ceramic body 411 have inner and outer walls arranged opposite to each other. The inner and outer walls of the ceramic body 411 refer to the inner and outer walls of the side portion of the ceramic body 411, respectively, with end face 411a connecting the inner and outer walls of the side portion. The outer wall of the reinforcing member 412 is flush with the outer wall 411b of the ceramic body 411, allowing the reinforcing member 412 to cover the corners of the outer wall 411b of the ceramic body 411. Consequently, under the reinforcing effect of the reinforcing member 412, the corners of the outer wall 411b of the ceramic body 411 are less prone to cracking, thus reducing the probability of cracking in the ceramic body 411.

[0062] The inner wall of the reinforcing member 412 is flush with the inner wall 411 of the ceramic body 411, so that the reinforcing member 412 can cover the corners of the inner wall 411 of the ceramic body 411. As a result, under the reinforcing effect of the reinforcing member 412, the corners of the inner wall 411 of the ceramic body 411 are less likely to crack, thereby reducing the probability of cracking of the ceramic body 411.

[0063] The distance between the inner wall and the outer wall of the side of the ceramic body 411 is the wall thickness of the side of the ceramic body 411.

[0064] In some embodiments, the wall thickness of the side portion of the ceramic body 411 is D, where 2 mm ≤ D ≤ 4 mm. For example, D is 2 mm, 2.5 mm, 3 mm, 3.5 mm, or 4 mm.

[0065] The wall thickness of the side portion of the annular body 421 is D1, where 0.3 mm ≤ D1 ≤ 0.5 mm. For example, D1 can be 0.3 mm, 0.4 mm, or 0.5 mm.

[0066] The values ​​of the wall thickness D on the side of the ceramic body 411 and the wall thickness D1 of the annular body 421 are not limited here.

[0067] Combination Figure 8 As shown, in some embodiments, the width of the reinforcing member 412 along the wall thickness direction of the side portion of the ceramic body 411 is W1, where 1 / 2 ≤ W1 / D ≤ 2 / 3. This arrangement ensures that, on the one hand, 1 / 2 ≤ W1 / D allows the reinforcing member 412 to cover a sufficiently large area of ​​the end face 411a of the ceramic body 411, thus facilitating reinforcement and reducing the likelihood of cracking in the ceramic body 411. Simultaneously, since W1 / D ≤ 2 / 3, the reinforcing member 412 does not need to completely cover the end face 411a of the ceramic body 411, saving material usage for the reinforcing member 412.

[0068] Continue to combine Figure 8 As shown, the distance from the annular body 421 to the inner wall of the reinforcing member 412 along the wall thickness direction of the side of the ceramic body 411 is W2, where 1 / 3 ≤ W2 / W1 ≤ 2 / 3. With this structural arrangement, the sealing welding position of the annular body 421 on the reinforcing member 412 is close to the center, thereby facilitating the reinforcing member 412 to provide a larger welding area for sealing welding with the annular body 421.

[0069] In some embodiments, the wall thickness D of the side portion of the ceramic body 411 satisfies the following value: 2mm ≤ D ≤ 4mm. Along the wall thickness direction of the side portion of the ceramic body 411, the distance between the outer wall of the reinforcing member 412 and the outer wall 411b of the side portion of the ceramic body 411 is W3, where 0mm ≤ W3 ≤ 0.5mm. Thus, the reinforcing member 412 can either completely cover the corner of the outer wall 411b of the side portion of the ceramic body 411, or it can not cover the corner of the outer wall 411b of the side portion of the ceramic body 411, ensuring that the portion of the corner of the outer wall 411b of the side portion of the ceramic body 411 exposed from the reinforcing member 412 does not exceed 0.5mm. This facilitates ensuring the overall coverage area of ​​the reinforcing member 412 on the end face 411a of the ceramic body 411, thereby facilitating the sealing welding of the reinforcing member 412 to the annular body 421.

[0070] Combination Figure 9As shown, a groove 4111 is formed on the end face 411a of the ceramic body 411, and a reinforcing member 412 is disposed in the groove 4111. In this embodiment, using the groove 4111 to provide the reinforcing member 412 helps to enhance the bonding stability between the reinforcing member 412 and the ceramic body 411. Moreover, when the reinforcing member 412 is manufactured using a ceramic material casting process, the ceramic material can be cast into the groove 4111, thereby reducing the probability of ceramic material overflow.

[0071] Combination Figure 10 As shown, the groove 4111 includes a first sidewall 4111a and a second sidewall 4111b disposed opposite to each other, and at least one of the first sidewall 4111a and the second sidewall 4111b is inclined relative to the end face 411a of the ceramic body 411. In this way, the inclined first sidewall 4111a and the second sidewall 4111b can further reduce the probability of stress concentration and cracking in the ceramic body 411.

[0072] The end face 411a of the ceramic body 411 is planar, and the angle between at least one of the first sidewall 4111a and the second sidewall 4111b and the end face 411a of the ceramic body 411 ranges from 100° to 145°. Within this angle range, the inclination angle of the first sidewall 4111a relative to the end face 411a is sufficiently large to reduce the probability of stress concentration and cracking of the outer wall 413 of the ceramic cover 4141 near the ceramic body 411.

[0073] The angle between the first sidewall 4111a and the end face 411a of the ceramic body 411 can be 100°, 105°, 115°, 125°, 135° or 145°, and is not limited here.

[0074] The angle between the second sidewall 4111b and the end face 411a of the ceramic body 411 can be 100°, 105°, 115°, 125°, 135° or 145°, and is not limited here.

[0075] In some embodiments, the included angle between the first sidewall 4111a and the second sidewall 4111b ranges from 30° to 60°. For example, the included angle between the first sidewall 4111a and the second sidewall 4111b is 30°, 35°, 40°, 45°, 50°, 55° or 60°.

[0076] In the above embodiments, the included angle between the first sidewall 4111a and the second sidewall 4111b is controlled within the range of 30° to 60°, so that the included angle between the first sidewall 4111a and the second sidewall 4111b is appropriate, which is conducive to dispersing welding stress.

[0077] In some embodiments, the groove wall of the groove 4111 is at least partially curved. This curved surface helps to disperse welding stress, reducing stress concentration and further lowering the probability of cracking in the ceramic body 411. Understandably, when the entire groove wall of the groove 4111 is curved, the groove 4111 can be considered an arc-shaped groove. It should be noted that the shape of an arc-shaped groove refers to the shape of the groove wall's outline when a cross-section is taken along the direction perpendicular to the length of the groove 4111.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] In some embodiments, the stationary magnet 33 includes a yoke plate 331.

[0084] 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.

[0085] 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.

[0086] 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 by the metal frame 42. That is, one end of the metal frame 42 is sealed to the ceramic body 411 of the ceramic cover 41, and the other end is sealed to the yoke plate 331.

[0087] 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.

[0088] It should be noted that the side of the ceramic body 411 is in the shape of a closed ring, thus forming a space for accommodating the contact portion 10. Correspondingly, the reinforcing member 412 is in the shape of a ring, and the annular body 421 serves as a structural member connected to the reinforcing member 412. The annular body 421 is also in the shape of a ring to connect with the reinforcing member 412.

[0089] 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 can meet the sealing connection requirements with the ceramic cover 41.

[0090] 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.

[0091] In some embodiments, a first through hole 41a and a second through hole 41b are provided on the side of the ceramic body 411 facing away from the metal frame 42 (i.e., the top of the ceramic body 411). 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. This allows electrical connection terminals to be formed on the outside of the ceramic cover 41 using the first and second stationary contacts 11 and 12, thus meeting the connection requirements between the output circuit and an external controlled object. Simultaneously, the first and second stationary contacts 11 and 12 respectively extend from the first and second through holes 41a and 41b into the interior of the ceramic cover 41 to correspond with the moving contact piece 13 located inside the ceramic cover 41. Both the first and second stationary contacts 11 and 12 are sealed and welded to the ceramic cover 41, ensuring that the contact portion 10 is in a sealed environment.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] Continue reading Figure 2As 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.

[0096] The sealing connection between the metal shell 50 and the yoke plate 331 includes, but is not limited to, welding or glue connection.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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, within which the coil 311 is disposed. 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.

[0104] 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.

[0105] 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 member adapted to be connected to a metal member in a switching device, characterized in that, The ceramic component includes a ceramic body and a reinforcing member. The reinforcing member is disposed on the end face of the ceramic body, and the side of the reinforcing member facing away from the end face is used for welding the metal component.

2. The ceramic part of claim 1, wherein, The material hardness of the reinforcing member is higher than that of the ceramic body; and / or, the reinforcing member is sheet-shaped.

3. The ceramic part of claim 2, wherein, The reinforcing component is made of ceramic.

4. The ceramic part according to any one of claims 1 to 3, characterized in that The ceramic body has a groove on its end face, and the reinforcing member is disposed in the groove.

5. The ceramic part of claim 4, wherein, The end face of the ceramic body is flat, and the groove includes a first sidewall and a second sidewall disposed opposite to each other, at least one of the first sidewall and the second sidewall being inclined relative to the end face of the ceramic body.

6. The ceramic part of claim 5, wherein, The included angle between at least one of the first sidewall and the second sidewall and the end face of the ceramic body ranges from 100° to 145°. And / or, the included angle between the first sidewall and the second sidewall is in the range of 30° to 60°.

7. The ceramic part of claim 4, wherein, The groove wall is at least partially curved.

8. The ceramic part according to any one of claims 1 to 3, characterized in that Both the reinforcing member and the ceramic body have inner and outer walls that are arranged opposite to each other. The outer wall of the reinforcing member is flush with the outer wall of the ceramic body, and / or the inner wall of the reinforcing member is flush with the inner wall of the ceramic body.

9. A contact cavity characterized by, 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 reinforcing member.

10. The contact cavity of claim 9, wherein, The metal component and the reinforcing member are brazed together.

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

12. The switching device of claim 11, wherein, 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.

13. The switching device of claim 12, wherein, The metal frame includes an annular body, which is sealed and welded to the reinforcing member.

14. The switching device of claim 12, wherein, The ceramic cover includes a connected side and a top. The wall thickness of the side is D, and the width of the reinforcing member along the wall thickness direction of the side is W1, where 1 / 2 ≤ W1 / D ≤ 2 / 3.

15. The switching device of claim 14, wherein, The metal frame includes an annular body, and the distance from the annular body along the wall thickness direction of the side portion to the inner wall of the reinforcing member is W2, where 1 / 3 ≤ W2 / W1 ≤ 2 / 3.

16. The switching device of claim 13, wherein, Along the wall thickness direction of the side portion, the distance between the outer wall of the reinforcing member and the outer wall of the side portion is W3, where 2mm≤D≤4mm and 0mm≤W3≤0.5mm.

17. The switching device according to any of claims 12-16, characterized by 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.

18. The switching device of claim 17, wherein, 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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