Connection structure of load leading-out terminal and ceramic cover and relay
By setting a transition ring structure with a compatible coefficient of thermal expansion between the load lead and the ceramic cover, welding stress is absorbed, the problem of welding cracking is solved, the connection strength and airtightness are improved, and the reliability of the relay is enhanced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIAMEN HONGFA ELECTRIC POWER CONTROLS CO LTD
- Filing Date
- 2025-06-20
- Publication Date
- 2026-07-21
AI Technical Summary
The weld stress at the junction of the load lead and the ceramic cover is relatively large, which makes it prone to cracking during long-term use.
A transition component is adopted, including first and second transition rings, which are welded to the load lead-out end and the ceramic cover respectively. The material is designed to be compatible with the coefficient of thermal expansion, forming an independent sheet structure to absorb welding stress and reduce the risk of cracking.
Effectively control welding stress, improve the connection strength and airtightness of the welding area, enhance the connection reliability between the load lead and the ceramic cover, and improve the reliability of the relay.
Smart Images
Figure CN224536988U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of relay technology, and in particular to the connection structure between the load lead and the ceramic cover, and the relay. Background Technology
[0002] A relay is an automated control device that uses a coil to generate a magnetic field, causing contacts to close and thus controlling the load. The relay's contacts are isolated within a ceramic housing and led out from the load leads that pass through the ceramic housing.
[0003] The load lead and the ceramic cover are welded together. Typically, fusible welding material is placed between the load lead and the ceramic cover, and a welding device is used to heat the welding material to a molten state, thereby connecting the load lead and the ceramic cover together.
[0004] However, there is significant welding stress at the weld between the load lead and the ceramic cover, which can easily lead to cracking at the weld during long-term use. Utility Model Content
[0005] Therefore, it is necessary to provide a connection structure between the load lead-out terminal and the ceramic cover to address the above-mentioned problems.
[0006] A connection structure between a load lead and a ceramic cover includes:
[0007] Load lead-out terminal;
[0008] Ceramic cover;
[0009] A transition assembly is disposed between the load lead-out end and the ceramic cover along a first direction. The transition assembly includes a first transition ring and a second transition ring arranged along the first direction. The first transition ring is welded to the load lead-out end, and the second transition ring is welded to the ceramic cover. The first transition ring and the second transition ring are directly or indirectly welded together. The materials between the first transition ring and the load lead-out end, and between the second transition ring and the ceramic cover, are combinations of materials with compatible coefficients of thermal expansion.
[0010] The aforementioned connection structure between the load lead and the ceramic cover includes a first transition ring in the transition assembly that is matched and welded to the load lead, and a second transition ring in the transition assembly that is matched and welded to the ceramic cover. Therefore, for the connection structure between the load lead and the ceramic cover according to this application, since the first transition ring and the load lead, as well as the second transition ring and the ceramic cover, are made of materials with compatible coefficients of thermal expansion, the welding stress between the first transition ring and the load lead, and between the second transition ring and the ceramic cover, is greatly reduced, effectively preventing cracking of the ceramic cover at the welding surface. Furthermore, since both the first and second transition rings are independent thin-plate structures, they can undergo slight deformation during welding, absorbing some of the welding stress during this deformation process, greatly reducing the risk of cracking of the first and second transition rings themselves during welding. Thus, welding the load lead and the ceramic cover through the transition assembly significantly reduces the risk of cracking and improves the reliability of the welding.
[0011] Based on this, the connection structure between the load lead and the ceramic cover of this application has the ability to effectively control the welding stress generated by welding, solves the problem of cracking in the welding area, and ensures the connection strength and airtightness of the welding area. This improves the connection reliability between the load lead and the ceramic cover, thereby improving the reliability of the relay.
[0012] In one embodiment, the load lead-out terminal includes a terminal body and a connecting ring body. The terminal body includes a first end body located outside the ceramic cover and a second end body extending into the ceramic cover. The connecting ring body is connected to the first end body and arranged around the second end body. The transition component is located between the connecting ring body and the ceramic cover along a first direction, and the lower end face of the connecting ring body is welded to the first transition ring body.
[0013] In the first direction, the orthographic projection of the lower end face of the connecting ring body is located within the orthographic projection of the upper end face of the first transition ring body.
[0014] In one embodiment, the ceramic cover includes a ceramic cover body and an annular boss, the annular boss being connected between a second transition ring and the ceramic cover body along a first direction.
[0015] In one embodiment, the transition component further includes at least one intermediate transition ring body stacked between the first transition ring body and the second transition ring body.
[0016] In one embodiment, the outer contour dimension of the transition component gradually increases from the first transition ring to the second transition ring.
[0017] In one embodiment, the first transition ring, the second transition ring, and the intermediate transition ring are all sheet-like annular components, and the first transition ring, the second transition ring, and the intermediate transition ring are coaxially arranged.
[0018] In one embodiment, the two end faces of the first transition ring, the second transition ring, and the intermediate transition ring in the first direction are all planar.
[0019] In one embodiment, at least one of the first transition ring, the second transition ring, and the intermediate transition ring has a rectangular cross-section; or,
[0020] At least one of the first transition ring, the second transition ring, and the intermediate transition ring has a trapezoidal cross-section, and along the first direction, the bottom edge of the trapezoidal cross-section near the ceramic cover is longer than the bottom edge near the load lead-out end.
[0021] In one embodiment, at least one of the first transition ring, the second transition ring, and the intermediate transition ring is a single-piece molded part; or...
[0022] At least one of the first transition ring body, the second transition ring body, and the intermediate transition ring body includes at least two transition monomers, and two adjacent transition monomers are sequentially connected and combined to form the first transition ring body, the second transition ring body, or the intermediate transition ring body.
[0023] In one embodiment, the transition component includes an intermediate transition ring body made of Kovar alloy;
[0024] The first transition ring is made of copper.
[0025] The second transition ring is made of ceramic.
[0026] This application further proposes a relay, which includes the connection structure between the load lead and the ceramic cover as described in some of the above embodiments. Attached Figure Description
[0027] Figure 1 This is an exploded view of the connection structure between the load lead-out terminal and the ceramic cover according to an embodiment of this application.
[0028] Figure 2 This is a cross-sectional view of the connection structure between the load lead-out terminal and the ceramic cover according to an embodiment of this application.
[0029] Figure 3 for Figure 2 Enlarged view of point A in the middle.
[0030] Figure 4 This is an exploded view of the connection structure between the load lead-out terminal and the ceramic cover according to another embodiment of this application.
[0031] Figure 5 This is a cross-sectional view of the connection structure between the load lead-out terminal and the ceramic cover according to another embodiment of this application.
[0032] Figure 6 for Figure 5 Enlarged view of section B in the middle.
[0033] Figure label:
[0034] 1. Load lead-out terminal; 11. Terminal body; 12. Connecting ring body; 2. Ceramic cover; 21. Ceramic cover body; 22. Annular boss; 3. Transition assembly; 31. First transition ring body; 32. Second transition ring body; 33. Intermediate transition ring body. Detailed Implementation
[0035] 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.
[0036] 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.
[0037] 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.
[0038] 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.
[0039] 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.
[0040] 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.
[0041] See Figures 1 to 6 As shown, the connection structure between the load lead-out terminal and the ceramic cover according to this application includes a load lead-out terminal 1, a ceramic cover 2, and a transition component 3. The transition component 3 is disposed between the load lead-out terminal 1 and the ceramic cover 2 along a first direction. The transition component 3 includes a first transition ring 31 and a second transition ring 32 arranged along the first direction. The first transition ring 31 is welded to the load lead-out terminal 1, and the second transition ring 32 is welded to the ceramic cover 2. The first transition ring 31 and the second transition ring 32 are directly or indirectly welded together. The materials between the first transition ring 31 and the load lead-out terminal 1, and between the second transition ring 32 and the ceramic cover 2, are combinations of materials with compatible coefficients of thermal expansion.
[0042] It is important to understand that thermal expansion coefficient compatibility is a technical term used to describe the degree of matching between two or more materials in terms of the physical property of thermal expansion (CTE). This ensures that they can work together when the temperature changes, avoiding internal stress, deformation, cracking, or even failure caused by excessive differences in expansion or contraction.
[0043] A material combination with compatible coefficients of thermal expansion refers to a system composed of two or more materials. Its core characteristic is that the coefficients of thermal expansion of each material are close to each other or form a synergistic effect through a reasonable ratio. This ensures that when the temperature changes, the linear or volumetric deformation caused by thermal expansion and contraction of each material is basically consistent or controlled within an acceptable range. Through the design of compatibility in the thermal expansion characteristics of the materials, interfacial thermal stress (such as shear stress and tensile stress) caused by differences in material thermal expansion is significantly reduced or eliminated, thereby avoiding problems such as cracking, weld failure, air leakage, and deformation failure of structural components during temperature cycling. Specifically, in this application, the first transition ring 31 and the load lead-out end 1, as well as the second transition ring 32 and the ceramic cover 2, are both made of materials with the same or similar coefficients of thermal expansion, thus forming a material combination with compatible coefficients of thermal expansion. In other words, the coefficient of thermal expansion of the first transition ring 31 can be the same as or close to the coefficient of thermal expansion of the load lead-out 1 to form a material combination with compatible coefficient of thermal expansion, and the coefficient of thermal expansion of the second transition ring 32 can be the same as or close to the coefficient of thermal expansion of the ceramic cover 2 to form a material combination with compatible coefficient of thermal expansion.
[0044] Specifically, the coefficient of thermal expansion of the first transition ring 31 is the same as or close to that of the load lead-out 1, resulting in relatively low welding stress when the first transition ring 31 is welded to the load lead-out 1. Similarly, the coefficient of thermal expansion of the second transition ring 32 is the same as or close to that of the ceramic cover 2, resulting in relatively low welding stress when the second transition ring 32 is welded to the ceramic cover 2. Furthermore, since both the first transition ring 31 and the second transition ring 32 are independent thin-plate structures, they can undergo slight deformation during welding and absorb some welding stress during this deformation. Thus, when the load lead-out is welded to the ceramic cover, the first transition ring 31 and the second transition ring 32 can absorb at least some of the welding stress through their own deformation. It should be understood that welding two adjacent objects requires heating the welding material (such as brazing filler material) to a molten state to connect the two objects, thereby achieving a connection between them. Therefore, a large amount of heat is released during the welding process.
[0045] Therefore, according to the connection structure between the load lead and the ceramic cover of this application, a first transition ring 31, which is matched and welded to the load lead 1, is provided in the transition component 3, and a second transition ring 32, which is matched and welded to the ceramic cover 2, is provided in the transition component 3. Thus, for the connection structure between the load lead and the ceramic cover according to this application, by welding the transition component 3 between the load lead 1 and the ceramic cover 2, the welding stress generated at the connection between the transition component 3 and the load lead 1, as well as the welding stress generated at the connection between the transition component 3 and the ceramic cover 2, is effectively controlled. Furthermore, since the connection structure between the load lead and the ceramic cover according to this application has effective control over the welding stress generated by welding, the problem of cracking in the welding area is solved, ensuring the connection strength and airtightness of the welding area, thereby improving the connection reliability between the load lead 1 and the ceramic cover 2, and thus improving the reliability of the relay.
[0046] It should be noted that, see reference Figure 3 and Figure 6 As shown, in some embodiments of this application, in the XZ plane, the first direction is as follows: Figure 6 The Z direction shown can also be understood as the longitudinal direction (or the height direction).
[0047] For example, see Figures 1 to 3 As shown, in one embodiment of this application, the load lead-out terminal 1 is made of copper, and the first transition ring 31 is correspondingly designed to be made of copper. Since both the load lead-out terminal 1 and the first transition ring 31 are made of copper, the difference Q1 between the first thermal expansion coefficients of the load lead-out terminal 1 and the first transition ring 31 is zero (i.e., Q1 = 0), so that the load lead-out terminal 1 and the first transition ring 31 form a material combination with compatible thermal expansion coefficients, so that the welding stress generated when the first transition ring 31 is welded to the load lead-out terminal 1 is small, and the first transition ring 31 can absorb at least part of the welding stress by undergoing slight deformation. Similarly, the second transition ring 32 is designed to be made of ceramic material. Since both the ceramic cover 2 and the second transition ring 32 are made of ceramic material, the difference Q2 between the second thermal expansion coefficients of the ceramic cover 2 and the second transition ring 32 is zero (i.e., Q2 = 0). This makes the ceramic cover 2 and the second transition ring 321 form a material combination with compatible thermal expansion coefficients, so that the welding stress generated when the second transition ring 32 is welded to the load lead-out end 1 is small, and the second transition ring 32 can absorb at least part of the welding stress by undergoing slight deformation.
[0048] Furthermore, it should be noted that, for example, in some embodiments of this application, the transition component 3 only includes a first transition ring 31 and a second transition ring 32, which are welded together. Since both the first transition ring 31 and the second transition ring 32 are independent thin-plate structures, they both possess the characteristic of undergoing slight deformation under external force and absorbing some welding stress during this deformation process. Thus, when the load lead-out end is welded to the ceramic cover, the first transition ring 31 and the second transition ring 32 can absorb at least part of the welding stress through their own deformation. Therefore, for the first transition ring 31 and the second transition ring 32 made of different materials, during welding, they can undergo slight deformation together to absorb some of the welding stress generated during welding, thereby greatly reducing the risk of cracking during welding.
[0049] Therefore, according to the connection structure between the load lead and the ceramic cover of this application, a transition component 3 is provided between the load lead 1 and the ceramic cover 2. The transition component 3 includes a first transition ring 31 and a second transition ring 32. This allows the transition component 3 to achieve the effect of absorbing welding stress in layers, so that the welding stress generated when welding two adjacent objects can be effectively controlled, thereby improving the connection reliability between the load lead 1 and the ceramic cover 2, and thus improving the reliability of the relay.
[0050] Of course, in some embodiments of this application, the transition component 3 is not limited to only including the first transition ring 31 and the second transition ring 32. For example, in some embodiments of this application, see [reference]. Figures 4 to 6 As shown, the transition assembly also includes at least one intermediate transition ring 33, which is stacked between the first transition ring 31 and the second transition ring 32. Thus, by adding at least one intermediate transition ring 33 between the first transition ring 31 and the second transition ring 32, the intermediate transition ring 33 serves as a transition connection, further improving the connection reliability between the load lead-out terminal 1 and the ceramic cover 2, thereby enhancing the reliability of the relay.
[0051] For example, see Figure 6 As shown, in one embodiment of this application, the transition component 3 includes a first transition ring 31, a second transition ring 32, and an intermediate transition ring 33. The first transition ring 31 connects the load lead-out end 1 and the intermediate transition ring 33, and the second transition ring 32 connects the intermediate transition ring 33 and the ceramic cover 2. In other words, in the first direction, the first transition ring 31, the intermediate transition ring 33, and the second transition ring 32 are stacked sequentially from top to bottom between the load lead-out end 1 and the ceramic cover 2.
[0052] In addition, the first transition ring 31 is made of copper, the intermediate transition ring 33 is made of Kovar alloy, and the second transition ring 32 is made of ceramic. Thus, when the load lead-out 1 is welded to the first transition ring 31, since both are made of copper, the welding stress generated during the welding of the load lead-out 1 to the first transition ring 31 is extremely small. Furthermore, the first transition ring 31 absorbs at least part of the welding stress through its own deformation, thereby ensuring a high connection reliability between the load lead-out 1 and the first transition ring 31. Similarly, when the ceramic cover 2 is welded to the second transition ring 32, since both are made of ceramic, the welding stress generated during the welding of the ceramic cover 2 to the second transition ring 32 is extremely small. Furthermore, the second transition ring 32 absorbs at least part of the welding stress through its own deformation, thereby ensuring a high connection reliability between the ceramic cover 2 and the second transition ring 32. Finally, since the intermediate transition ring 33 is made of Kovar alloy, which has good strength and ductility, the intermediate transition ring 33 can form reliable welds with both the first transition ring 31 and the second transition ring 32.
[0053] Therefore, according to the transition component 3 of this application, at least one intermediate transition ring 33 is added between the first transition ring 31 and the second transition ring 32. The intermediate transition ring 33 can serve as a transition connection between the first transition ring 31 and the second transition ring 32, so as to further improve the connection reliability between the load lead-out terminal 1 and the ceramic cover 2, thereby improving the reliability of the relay.
[0054] It should be further noted that the above embodiment uses the example of a transition component 3 having one intermediate transition ring 33, but this application is not limited to this. For example, the number of intermediate transition rings 33 in the transition component 3 can also be two, three, four, five, six, or seven, etc. In addition, the above embodiment uses Kovar alloy to make the intermediate transition ring 33, but this application is not limited to this, and the material used to make the intermediate transition ring 33 can be selected according to design requirements.
[0055] See Figure 6 As shown, in some embodiments of this application, the outer contour dimensions of the transition component 3 gradually increase from the first transition ring 31 to the second transition ring 32. In other words, along the first direction, the transition component 3 exhibits a "smaller at the top and larger at the bottom" variation trend, thereby achieving optimization in both mechanical connection and thermal stress distribution dimensions.
[0056] For example, see Figure 6As shown, in the transition component 3, the first transition ring 31 has the smallest radial dimension, the second transition ring 32 has the largest radial dimension, and the radial dimension of the intermediate transition ring 33 is between the radial dimensions of the first transition ring 31 and the second transition ring 32. Furthermore, if the transition component 3 has multiple intermediate transition rings 33, the radial dimensions of these intermediate transition rings 33 gradually increase from the first transition ring 31 to the second transition ring 32. This gradually expanding structural design is beneficial for improving the connection strength between adjacent objects. It should also be noted that since the transition component 3 is composed of multiple independent components stacked sequentially, from a manufacturing process perspective, it is easier to achieve a "smaller at the top, larger at the bottom" configuration for the overall transition component 3, reducing manufacturing difficulty and cost.
[0057] See Figure 6 As shown, in some embodiments of this application, the first transition ring 31, the second transition ring 32, and the intermediate transition ring 33 are all sheet-like annular components, and are coaxially arranged. In other words, the central axes of each ring coincide with the same longitudinal axis, forming a multi-layered concentric ring structure. The coaxial structure ensures that the deformation direction of the transition component 3 is symmetrically distributed along the axis when subjected to thermal expansion or mechanical loads, effectively reducing the impact risk of eccentric stress on the ceramic cover 2.
[0058] In some embodiments of this application, the two end faces of the first transition ring 31, the second transition ring 32, and the intermediate transition ring 33 in the first direction are all planar. See also... Figure 6 As shown, this can also be understood as follows: the upper and lower end faces of the first transition ring 31 are both planes, the upper and lower end faces of the second transition ring 32 are both planes, and the upper and lower end faces of the intermediate transition ring 33 are both planes. This ensures that the contact interfaces between adjacent rings form a complete planar matching relationship, thereby optimizing both the geometry and stress distribution. During welding, the planar contact interfaces ensure that the molten solder spreads evenly, forming a continuous and dense weld bond layer, avoiding localized incomplete penetration defects caused by curved or irregular end faces.
[0059] See Figure 6As shown, in some embodiments of this application, the cross-sections of the first transition ring 31, the second transition ring 32, and the intermediate transition ring 33 are all rectangular. The symmetrical characteristics of the rectangular cross-section ensure that thermal expansion deformation is uniformly distributed along the axial direction, eliminating torsional stress caused by cross-sectional asymmetry. Furthermore, for rings with this configuration, the right-angled edges are parallel when the rings are stacked, forming a stable axial load-bearing skeleton and improving the displacement resistance of the transition component 3. It should be noted that the above embodiments are described using the example of the first transition ring 31, the second transition ring 32, and the intermediate transition ring 33 all having rectangular cross-sections, but this application is not limited to this. For example, at least one of the first transition ring 31, the second transition ring 32, and the intermediate transition ring 33 may have a rectangular cross-section.
[0060] In another embodiment of this application, the cross-sections of the first transition ring 31, the second transition ring 32, and the intermediate transition ring 33 are all trapezoidal, and along the first direction, the base of the trapezoidal cross-section near the ceramic cover 2 is longer than the base of the trapezoidal cross-section near the load lead-out end 1. In other words, in the height direction, the upper base of the trapezoidal cross-section is smaller than the lower base, i.e., the trapezoid is a "smaller at the top and larger at the bottom" configuration. This converts part of the axial thrust into radial clamping force, enhances the interlayer bonding stability, and the inclined structure of the ring guides the welding thermal expansion deformation to be released along the inclined direction, reducing the lateral pulling effect on the edge of the ceramic cover 2. It should be noted that the above embodiment uses the example of the first transition ring 31, the second transition ring 32, and the intermediate transition ring 33 all having trapezoidal cross-sections, but this application is not limited to this. For example, at least one of the first transition ring 31, the second transition ring 32, and the intermediate transition ring 33 may have a trapezoidal cross-section.
[0061] In some embodiments of this application, at least one of the first transition ring 31, the second transition ring 32, and the intermediate transition ring 33 is a single-piece molded component. For example, the first transition ring 31, the second transition ring 32, and the intermediate transition ring 33 are all single-piece molded components. Alternatively, in other embodiments of this application, at least one of the first transition ring 31, the second transition ring 32, and the intermediate transition ring 33 includes at least two transition units, with adjacent two transition units sequentially connected to form the first transition ring 31, the second transition ring 32, or the intermediate transition ring 33. For example, the first transition ring 31 includes two transition units connected end-to-end to form the first transition ring 31. Specifically, for example, the first transition ring 31 is annular, and each transition unit is an arc-shaped thin sheet, such that two transition units are connected end-to-end to form the first transition ring 31.
[0062] See Figure 1 and Figure 2 ,as well as Figure 4 and Figure 5As shown, in some embodiments of this application, the load lead-out terminal 1 includes a terminal body 11 and a connecting ring 12. The terminal body 11 includes a first end body 111 located outside the ceramic cover 2 and a second end body 112 extending into the ceramic cover 2. The connecting ring 12 is connected to the first end body 111 and the second end body 112 is disposed thereon. The transition component 3 is connected between the connecting ring 12 and the ceramic cover 2 along a first direction, and the lower end face of the connecting ring 12 is welded to the first transition ring 31.
[0063] In the first direction, the orthographic projection of the lower end face of the connecting ring 12 is located within the orthographic projection of the upper end face of the first transition ring 31. Thus, in the first direction, the transition component 3 provides good support for the load lead-out end 1.
[0064] For example, since the thickness of the connecting ring 12 is smaller than the thickness of the first transition ring 31, when the connecting ring 12 and the first transition ring 31 are stacked along the height direction, the orthographic projection of the lower end face of the connecting ring 12 lies within the orthographic projection of the upper end face of the first transition ring 31. It should be understood that, for example, if both the connecting ring 12 and the first transition ring 31 are circular ring structures, the thickness of the connecting ring 12 can be understood as the difference between its outer and inner edges, and the thickness of the first transition ring 31 can be understood as the difference between its outer and inner edges. Based on this, when the connecting ring 12 and the first transition ring 31 are stacked along the height direction, since the orthographic projection of the lower end face of the connecting ring 12 in the height direction lies within the orthographic projection of the upper end face of the first transition ring 31 in the height direction, the lower end face of the connecting ring 12 is in complete contact with the upper end face of the first transition ring 31. This not only ensures that the transition component 3 provides reliable support for the load lead 1 in the height direction, but also provides a large effective welding surface between the load lead 1 and the transition component 3, thereby improving the connection reliability between the load lead 1 and the transition component 3, and thus improving the reliability of the relay.
[0065] See Figures 1 to 6 As shown, in some embodiments of this application, the ceramic cover 2 includes a ceramic cover body 21 and an annular boss 22, the annular boss 22 being connected between the second transition ring 32 and the ceramic cover body 21 along a first direction. Since the annular boss 22 is thinner than the ceramic cover body 21, it forms a geometric transition structure on the side of the ceramic cover 2.
[0066] For example, the ceramic cover body 21, as the core component of the insulation seal, has a relatively large size that ensures the mechanical strength and sealing reliability of the overall structure. The annular boss 22, by reducing its size, forms a relatively flexible connection area between the ceramic cover body 21 and the transition component 3. This design allows the welding stress generated during welding to be initially absorbed through the slight deformation of the annular boss 22, preventing the welding stress from being directly transmitted to the ceramic cover body 21. Because the reduced size of the annular boss 22 gives it a relatively higher degree of deformation freedom, it can release localized stress concentrations through minor deformation under thermal expansion differences or mechanical loads.
[0067] It should be noted that the contact surfaces of the annular boss 22 and the transition component 3 are designed with matching dimensions, resulting in a smooth stress transfer path at the welding interface. This geometric matching ensures that the welding stress is evenly distributed across the entire end face of the annular boss 22, avoiding edge stress concentration caused by abrupt changes in cross-section.
[0068] Furthermore, the annular boss 22 and the ceramic cover body 21 are integrally sintered from the same ceramic material, forming a stepped transition structure through a molding process (such as isostatic pressing). This integrated design not only eliminates the thermal stress source that may be generated at the interface of dissimilar materials, but also ensures the reliability of insulation performance through material continuity. During the welding thermal cycle, the annular boss 22 gradually disperses and dissipates residual stress through the layered stress absorption mechanism of the transition component 3 in conjunction with controllable elastic deformation, thereby constructing a multi-layered protective system on the ceramic cover 2 side.
[0069] The relay according to this application includes the connection structure between the load lead and the ceramic cover as described in some of the above embodiments. In the connection structure between the load lead 1 and the ceramic cover 2, a transition component 3 is provided between the load lead 1 and the ceramic cover 2. The transition component 3 includes a first transition ring 31 and a second transition ring 32. This allows the transition component 3 to achieve the effect of absorbing welding stress in layers, so that the welding stress generated when welding two adjacent objects can be effectively controlled, thereby improving the connection reliability between the load lead 1 and the ceramic cover 2, and thus improving the reliability of the relay.
[0070] 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.
[0071] 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 connection structure between a load lead-out terminal and a ceramic cover, characterized in that, include: Load lead-out terminal (1); Ceramic cover (2); A transition component (3) is disposed between the load lead-out end (1) and the ceramic cover (2) along a first direction. The transition component (3) includes a first transition ring (31) and a second transition ring (32) arranged along the first direction. The first transition ring (31) is welded to the load lead-out end (1), and the second transition ring (32) is welded to the ceramic cover (2). The first transition ring (31) and the second transition ring (32) are directly or indirectly welded together. The first transition ring (31) and the load lead-out end (1), as well as the second transition ring (32) and the ceramic cover (2), are both material combinations that can form a compatible coefficient of thermal expansion.
2. The connection structure between the load lead-out terminal and the ceramic cover according to claim 1, characterized in that, The load lead-out terminal (1) includes a terminal body (11) and a connecting ring (12). The terminal body (11) includes a first end body (111) located outside the ceramic cover (2) and a second end body (112) extending into the ceramic cover (2). The connecting ring (12) is connected to the first end body (111) and arranged around the second end body (112). The transition component (3) is located between the connecting ring (12) and the ceramic cover (2) along the first direction, and the lower end face of the connecting ring (12) is welded to the first transition ring (31). In the first direction, the orthographic projection of the lower end face of the connecting ring (12) is located within the orthographic projection of the upper end face of the first transition ring (31).
3. The connection structure between the load lead-out terminal and the ceramic cover according to claim 1, characterized in that, The ceramic cover (2) includes a ceramic cover body (21) and an annular boss (22), the annular boss (22) being connected between the second transition ring (32) and the ceramic cover body (21) along the first direction.
4. The connection structure between the load lead-out terminal and the ceramic cover according to any one of claims 1 to 3, characterized in that, The transition component (3) further includes at least one intermediate transition ring (33) which is stacked between the first transition ring (31) and the second transition ring (32).
5. The connection structure between the load lead-out terminal and the ceramic cover according to claim 4, characterized in that, From the first transition ring (31) to the second transition ring (32), the outer contour size of the transition component (3) gradually increases.
6. The connection structure between the load lead-out terminal and the ceramic cover according to claim 4, characterized in that, The first transition ring (31), the second transition ring (32) and the intermediate transition ring (33) are all sheet-like annular parts, and the first transition ring (31), the second transition ring (32) and the intermediate transition ring (33) are coaxially arranged.
7. The connection structure between the load lead-out terminal and the ceramic cover according to claim 4, characterized in that, The first transition ring (31), the second transition ring (32), and the intermediate transition ring have two planar end faces in the first direction.
8. The connection structure between the load lead-out terminal and the ceramic cover according to claim 7, characterized in that, The cross-section of at least one of the first transition ring (31), the second transition ring (32), and the intermediate transition ring is rectangular; or, At least one of the first transition ring (31), the second transition ring (32) and the intermediate transition ring has a trapezoidal cross-section, and along the first direction, the bottom edge of the trapezoidal cross-section near the ceramic cover (2) is longer than the bottom edge near the load lead-out end (1).
9. The connection structure between the load lead-out terminal and the ceramic cover according to claim 4, characterized in that, At least one of the first transition ring (31), the second transition ring (32), and the intermediate transition ring is a single-piece molded part; or, At least one of the first transition ring (31), the second transition ring (32) and the intermediate transition ring includes at least two transition monomers, and two adjacent transition monomers are sequentially connected and combined to form the first transition ring (31), the second transition ring (32) or the intermediate transition ring.
10. The connection structure between the load lead-out terminal and the ceramic cover according to claim 4, characterized in that, The transition component (3) includes an intermediate transition ring body made of Kovar alloy; The first transition ring (31) is made of copper. The second transition ring (32) is made of ceramic.
11. A relay, characterized in that, include: The connection structure between the load lead-out terminal and the ceramic cover according to any one of claims 1 to 10.