Connection structure between lead-out terminals and insulating cover and relay

Abstract

This application relates to a connection structure between a lead-out terminal and an insulating cover, and a relay, including an insulating cover with a mounting through hole; a lead-out terminal, comprising at least two rings, each non-intersectingly arranged around the mounting through hole and welded to the insulating cover, wherein the at least two rings and the insulating cover can respectively form annular welding sealing surfaces surrounding the mounting through hole; the at least two rings can deform under stress during the welding of the lead-out terminal to the insulating cover to absorb welding stress. By providing at least two rings on the lead-out terminal to seal the connection between the lead-out terminal and the insulating cover, compared to the single-ring structure in related technologies, this embodiment allows each ring to be extremely thin, which is beneficial for absorbing welding stress through the deformation of the double-ring or multi-ring structure, avoiding cracking problems caused by stress concentration.

Description

Technical Field

[0001] This application relates to the field of power electrical technology, and in particular to a connection structure between a lead-out terminal and an insulating cover, and a 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] Currently, some relays connect their load leads to external components by welding (such as brazing). The load leads have flanges, which are either welded together to a ceramic cover or designed as a ring and welded to the ceramic cover.

[0004] However, the above setup has the following problems: the connection method can easily generate large stress on the welding surface, which can easily cause the ceramic cover to crack and leak air, leading to abnormal product damage. Utility Model Content

[0005] Therefore, it is necessary to provide a connection structure between the lead-out terminal and the insulating cover, as well as a relay, to address the problem that traditional connection methods easily generate large stress on the welding surface, leading to cracking of the ceramic cover.

[0006] This application embodiment first provides a connection structure between a lead-out terminal and an insulating cover, the connection structure between the lead-out terminal and the insulating cover including:

[0007] Insulating cover, with mounting through holes;

[0008] The lead-out end includes at least two rings, which are respectively arranged non-intersectingly around the mounting through hole and respectively welded to the insulating cover. The at least two rings and the insulating cover can respectively form annular welding sealing surfaces surrounding the mounting through hole.

[0009] The at least two rings are capable of undergoing stress deformation during the welding of the lead-out end to the insulating cover, thereby absorbing welding stress.

[0010] In one embodiment, the lead-out end includes a body, and the at least two rings include a first ring and a second ring. The body is inserted into the mounting through hole, the first ring is disposed around the mounting through hole, and the second ring is disposed around the first ring. The end of the first ring and / or the second ring away from the insulating cover is connected to the portion of the body located outside the insulating cover.

[0011] In one embodiment, a first annular groove is formed between the first annular body and the body, and a second annular groove is formed between the second annular body and the first annular body, wherein the depth of the second annular groove is less than the depth of the first annular groove.

[0012] The solder is disposed between the first ring body and the insulating cover, and between the second ring body and the insulating cover, and the molten solder can be at least partially adsorbed in the second ring groove, and can climb along the side wall of the second ring groove to the bottom of the second ring groove.

[0013] In one embodiment, the lead-out end includes a plurality of first ring bodies, which are concentrically arranged and sequentially spaced around the outer periphery of the body;

[0014] And / or, the lead-out end includes a plurality of second rings, which are concentrically arranged and sequentially spaced around the outer periphery of the first ring.

[0015] In one embodiment, at least one of the first ring body and the second ring body is integrally formed with the body, while the other is separately disposed from the body;

[0016] And / or, the first ring body and the second ring body are both integrally formed with the body.

[0017] In one embodiment, the first ring body and the second ring body are an integral structure, and the first ring body and the second ring body are separately set from the main body in an integral structure manner.

[0018] In one embodiment, the body includes a lead-out portion and a plug-in portion, the plug-in portion being inserted into the mounting through hole, the lead-out portion being connected to the plug-in portion and located outside the insulating cover; the first ring body and the second ring body are respectively arranged around the plug-in portion.

[0019] In one embodiment, the first ring extends toward the side away from the insulating cover and is connected to the surface of the lead-out portion toward the side of the insulating cover. The second ring is a flexible cover, which includes a first end face and a second end face. The first end face extends toward the insulating cover and is welded to the insulating cover. The second end face extends away from the insulating cover and is bent and connected to the surface of the lead-out portion toward the side of the insulating cover.

[0020] In one embodiment, the thickness of the second ring body is less than the thickness of the first ring body, and the ring width of the welding surface between the second ring body and the insulating cover is less than the ring width of the welding surface between the first ring body and the insulating cover.

[0021] In one embodiment, the second ring body has an arc-shaped or transition curve in cross-section along the axial direction of the mounting through hole, one end of the second ring body is welded to the insulating cover, and the other end of the second ring body is sealed and connected to the outer wall of the first ring body.

[0022] In one embodiment, the insulating cover has an annular groove on the connection surface with the lead-out end, the annular groove being located between the first ring body and the second ring body to isolate the welding surfaces of the first ring body, the second ring body and the insulating cover.

[0023] In one embodiment, the insulating cover is made of ceramic.

[0024] This application also provides a relay, including the connection structure between the lead-out terminal and the insulating cover as described in the above embodiments.

[0025] The aforementioned connection structure between the lead-out terminal and the insulating cover, as well as the relay, utilizes at least two non-intersecting rings at the lead-out terminal, with these rings surrounding the mounting through-hole of the insulating cover. By welding these two rings to the surface of the insulating cover, a ring-shaped welded sealing surface is formed around the mounting through-hole. This arrangement achieves a fixed connection between the lead-out terminal and the insulating cover. This method creates a double-ring or multi-ring structure distributed around the outer periphery of the main body. Compared to the single-ring structure in traditional technology, this embodiment allows for a thinner thickness for each ring in the double-ring or multi-ring structure. This facilitates the absorption of welding stress between the lead-out terminal and the insulating cover through deformation during welding, preventing stress concentration-induced cracking. Furthermore, the double-ring or multi-ring structure design increases the overall effective welding area, effectively reducing welding stress while also improving the welding strength between the lead-out terminal and the insulating cover. Additionally, the double-ring or multi-ring structure design allows for the distributed stress at the welding interface, distributing stress over a larger area and further preventing stress concentration. In addition, the design of double-ring or multi-ring structures can form independent double or multiple sealing barriers, improving the connection reliability of the insulation cover and the lead-out terminals. Attached Figure Description

[0026] Figure 1 This is a partial structural diagram of the connection structure between the lead-out end and the insulating cover provided according to some embodiments of this application.

[0027] Figure 2 This is a cross-sectional schematic diagram of the connection structure between the lead-out end and the insulating cover according to some embodiments of this application.

[0028] Figure 3 for Figure 2 A magnified schematic diagram of the structure at point A in the middle.

[0029] Figure 4This is a structural disassembly diagram of the connection structure between the lead-out terminal and the insulating cover provided according to some embodiments of this application.

[0030] Figure 5 This is a cross-sectional structural diagram of a lead-out terminal provided according to some embodiments of this application.

[0031] Figure 6 This is a schematic cross-sectional view of another connection structure between the lead-out end and the insulating cover provided according to some embodiments of this application.

[0032] Figure 7 for Figure 6 Enlarged schematic diagram of the structure at point B.

[0033] Figure 8 This is a disassembled schematic diagram of another structural connection structure between the lead-out end and the insulating cover provided according to some embodiments of this application.

[0034] Figure 9 This is a schematic cross-sectional view of another lead-out structure provided according to some embodiments of this application.

[0035] Figure 10 This is a schematic cross-sectional view of another connection structure between the lead-out end and the insulating cover provided according to some embodiments of this application.

[0036] Figure 11 for Figure 10 A magnified schematic diagram of the structure at point C.

[0037] Figure 12 This is a disassembled schematic diagram of another structural connection structure between the lead-out end and the insulating cover provided according to some embodiments of this application.

[0038] Figure 13 This is a disassembled schematic diagram of another structure of the lead-out terminal provided according to some embodiments of this application.

[0039] Figure 14 This is a schematic cross-sectional view of another connection structure between the lead-out end and the insulating cover provided according to some embodiments of this application.

[0040] Figure 15 for Figure 14 A magnified schematic diagram of the structure at point D.

[0041] Figure 16 This is a disassembled schematic diagram of another structural connection structure between the lead-out end and the insulating cover provided according to some embodiments of this application.

[0042] Figure 17 This is a schematic diagram of a first ring body and a second ring body provided according to some embodiments of this application.

[0043] Figure 18 This is a schematic cross-sectional view of another connection structure between the lead-out end and the insulating cover provided according to some embodiments of this application.

[0044] Figure 19 for Figure 18 A magnified schematic diagram of the structure at point E in the middle.

[0045] Figure 20 This is a disassembled schematic diagram of another structural connection structure between the lead-out end and the insulating cover provided according to some embodiments of this application.

[0046] Figure 21 This is a schematic diagram of the structure of an insulating cover (annular groove) provided according to some embodiments of this application.

[0047] Figure 22 This is a schematic cross-sectional view of another connection structure between the lead-out end and the insulating cover provided according to some embodiments of this application.

[0048] Figure 23 for Figure 22 Enlarged schematic diagram of the structure at point F.

[0049] Figure 24 This is a disassembled schematic diagram of another structural connection structure between the lead-out end and the insulating cover provided according to some embodiments of this application.

[0050] Figure 25 This is a schematic diagram of another structure of the first and second ring bodies provided according to some embodiments of this application.

[0051] Icon labels:

[0052] 100. Insulating cover; 101. Chamber; 102. Mounting through hole; 103. Annular groove;

[0053] 200, Lead-out end; 210, Body; 211, Lead-out part; 212, Insertion part; 220, First ring body; 230, Second ring body; 201, First ring groove; 202, Second ring groove. Detailed Implementation

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] As mentioned in the background section, currently, the welding connection between the load lead and the ceramic cover mainly adopts the following two methods, but both suffer from stress problems caused by the mismatch of the thermal expansion coefficients of the materials. Specifically, the boss end face of the load lead directly contacts the ceramic cover and is welded to the surface of the ceramic cover by brazing. Since the load lead is made of metal, the difference in thermal expansion coefficients between metal and ceramic is significant. This easily leads to shear stress at the interface due to different expansion or contraction rates during temperature changes. This stress is mostly concentrated at the edge of the weld surface, easily causing and propagating ceramic microcracks, resulting in insulation failure and gas leakage. To improve the above-mentioned problems, related technologies design the boss of the lead as a ring, that is, using a single-ring welding structure, connecting to the ceramic cover through the ring-shaped welding surface to disperse stress. However, considering the strength of the single-ring welding structure connecting the load lead and the ceramic cover, the single-ring welding structure cannot be designed too thin. Therefore, this connection method still leaves a large amount of stress on the welding surface.

[0061] To address the aforementioned problems, this application provides a connection structure and relay for a lead-out terminal and an insulating cover. By providing at least two non-intersecting rings at the lead-out terminal, with these rings surrounding a mounting through-hole in the insulating cover, and welding these rings to the surface of the insulating cover to form an annular welded sealing surface around the mounting through-hole, this arrangement achieves a fixed connection between the lead-out terminal and the insulating cover. This method forms a double-ring or multi-ring structure distributed around the outer periphery of the relay. Compared to the single-ring structure in traditional technology, this embodiment allows for a thinner thickness for each ring in the double-ring or multi-ring structure. This facilitates the absorption of welding stress between the lead-out terminal and the insulating cover through deformation during welding, preventing stress concentration-induced cracking. Furthermore, the double-ring or multi-ring structure design increases the overall effective welding area, effectively reducing welding stress while also improving the welding strength between the lead-out terminal and the insulating cover. Additionally, the double-ring or multi-ring structure design allows for a dispersed stress distribution at the welding interface, further reducing stress concentration over a larger area. In addition, the design of double-ring or multi-ring structures can form independent double or multiple sealing barriers, improving the connection reliability of the insulation cover and the lead-out terminals.

[0062] See Figures 1-3 As shown, Figure 1 This is a partial structural diagram of the connection structure between the lead-out end and the insulating cover provided according to some embodiments of this application. Figure 2 This is a cross-sectional schematic diagram of the connection structure between the lead-out end and the insulating cover according to some embodiments of this application. Figure 3 for Figure 2 An enlarged schematic diagram of the structure at point A. One embodiment of this application provides a connection structure between a lead-out terminal and an insulating cover, used for the fixed connection of a lead-out terminal 200 and an insulating cover 100 during the welding process in a relay. This connection structure may include the insulating cover 100 and the lead-out terminal 200.

[0063] The insulating cover 100 is provided with a mounting through hole 102; the lead-out end 200 includes at least two rings, which are respectively non-intersectingly arranged around the mounting through hole 102 and respectively welded to the insulating cover 100. The at least two rings and the insulating cover 100 can respectively form annular welding sealing surfaces around the mounting through hole 102; the at least two rings can be deformed under force during the welding of the lead-out end 200 to the insulating cover 100 to absorb welding stress.

[0064] Understandably, the insulating cover 100 can be made of high-temperature resistant engineering plastics, special resins, ceramics, or other materials to meet the requirements of high insulation, arc resistance, and heat aging resistance. In one example, the insulating cover 100 is made of ceramic. Designing the insulating cover 100 as a ceramic cover can maintain its stable performance in high-temperature environments.

[0065] The insulating cover 100 has a chamber 101 inside, which is usually filled with an inert gas, such as nitrogen, to improve the insulation performance and arc extinguishing effect of the relay. The insulating cover 100 is also provided with a mounting through hole 102. The mounting through hole 102 is mainly provided to ensure that the lead-out end 200 extends out of the insulating cover 100. Of course, the diameter of the mounting through hole 102 can be slightly larger than the diameter of the body 210 of the lead-out end 200 to facilitate the insertion of the lead-out end 200.

[0066] In this embodiment, the lead-out end 200 has at least two rings located outside the insulating cover 100. Taking two rings as an example, the two rings are arranged around the mounting through hole 102 without intersecting. This can be understood as the two rings being nested together. Of course, the nesting of the two rings includes various nesting situations such as concentric and eccentric arrangement, which are not limited here. The two rings can form an annular welding sealing surface around the mounting through hole 102 with the insulating cover 100 to ensure the welding strength and welding sealing performance between the lead-out end 200 and the insulating cover 100.

[0067] To clearly describe the structure of the lead-out terminal 200, in one example, the lead-out terminal 200 is divided into a body 210, a first ring 220, and a second ring 230. The body 210 is inserted into the mounting through hole 102, and the first ring 220 is arranged around the body 210. It can be further understood that a portion of the body 210 can pass through the mounting through hole 102 and connect with the contact end located inside the insulating cover 100, while the first ring 220 and the second ring 230 are located outside the cover and connected to the body 210. The connection between the first ring body 220, the second ring body 230 and the body 210 can be as follows: the first ring body 220 is disposed around the outer periphery of the body 210 and has a gap with the outer wall surface of the body 210, and is fixedly connected to the body 210 (e.g., by welding); the second ring body 230 is disposed around the outer periphery of the first ring body 220 and has a gap with the first ring body 220. The second ring body 230 can be directly fixed to the body 210, or fixed to the outer periphery of the first ring body 220, or fixed to both the body 210 and the first ring body 220. No specific restrictions are imposed here.

[0068] It should be noted that one of the first ring body 220 and the second ring body 230 can be integrally formed with the body 210, while the other can be separately formed from the body 210 and directly or indirectly fixed to the body 210 by processes such as welding (e.g., brazing). Besides the above configuration, the first ring body 220 and the second ring body 230 can both be integrally formed with the body 210. For example, by providing a boss on the outer periphery of the body 210 and machining the boss, the first ring body 220 and the second ring body 230 can be formed. Alternatively, the first ring body 220 and the second ring body 230 can both be separately formed from the body 210, and the first ring body 220 and the second ring body 230 can be fixed to the body 210 respectively by processes such as welding.

[0069] More specifically, the first ring 220 and the second ring 230 can be understood as a double-ring structure surrounding the body 210. The first ring 220 is defined as the inner ring, and the second ring 230 as the outer ring. There is a gap between the first ring 220 and the outer circumferential surface of the body 210, and a gap between the second ring 230 and the first ring 220. These gaps provide space for the first ring 220 and the second ring 230 to deform under stress during welding with the insulating cover 100, which helps the first ring 220 and the second ring 230 absorb at least part of the welding stress, thereby reducing the risk of breakage at the connection between the lead-out end 200 and the insulating cover 100 due to welding stress. Furthermore, this embodiment, by connecting the lead-out end 200 to the insulating cover 100 simultaneously through the aforementioned double-ring structure, compared to the traditional single-ring arrangement, effectively absorbs welding stress while also improving the connection strength between the lead-out end 200 and the insulating cover 100. Furthermore, the aforementioned double-ring structure can be brazed to the surface of the insulating cover 100 to form a double-sealed interface (welding surface).

[0070] In this embodiment, the body 210 is a columnar structure, and a boss extends outward from the outer periphery of the columnar structure outside the insulating cover 100. This boss can be used to directly form the first ring 220 and / or the second ring 230. Alternatively, the boss can also serve as a transition portion where the first ring 220 and / or the second ring 230 overlap. Specifically, this may include at least the following situations: Figures 10-13 As shown, when the first ring body 220 is integrally formed with the body 210 and the second ring body 230 is separately set with the body 210, the first ring body 220 can be formed with an annular groove on the boss by machining, and the part of the boss located outside the annular groove forms the first ring body 220; the second ring body 230 can be formed by external machining and can be directly set around the outer periphery of the body 210 to form an annular groove with the first ring body 220. When the first ring body 220 is separately set with the body 210 and the second ring body 230 is integrally formed with the body 210, the second ring body 230 can be machined first, that is, an annular groove with a larger width (radial of the mounting through hole 102) can be formed on the boss by machining, and the part of the boss located outside the annular groove forms the second ring body 230. The first ring body 220 can be formed by external machining, by setting the first ring body 220 in the annular groove to form the first ring body 220 and the second ring body 230 around the outer periphery of the body 210.

[0071] like Figures 2-9 As shown, when the first ring body 220 and the second ring body 230 are integrally formed with the body 210, two annular grooves can be formed on the boss by mechanical processing, and the two annular grooves are concentrically arranged, thereby forming two concentrically nested first ring bodies 220 and second ring bodies 230.

[0072] like Figures 14-17 , Figures 22-25 As shown, when the first ring 220 and the second ring 230 are both separately disposed from the body 210, at least the following two situations may be included: the first ring 220 and the second ring 230 are manufactured separately, and then the first ring 220 and the second ring 230 are respectively fixed to the body 210 (hereinafter, the lead-out portion 211) by welding or other means. Alternatively, the first ring 220 and the second ring 230 are first integrally formed, and then fixed to the body 210 by welding or other means.

[0073] The above describes several ways in which the first ring body 220 and the second ring body 230 are formed. Of course, they are not limited to the above situations. For details, please refer to the following embodiments for understanding. They will not be repeated here.

[0074] In one example, one end of the second ring 230 is welded to the insulating cover 100, and the other end of the second ring 230 is connected to the portion of the first ring 220 or the body 210 located outside the insulating cover. Specifically, both the first ring 220 and the second ring 230 have an end face facing the end face of the insulating cover 100 (this end face is used for welding to the insulating cover 100), and another end face opposite to this end face. The other end face of the first ring 220 is used to connect (e.g., weld) to the portion of the body 210 located outside the insulating cover 100. The second ring 230 is arranged around the outer periphery of the first ring 220. Therefore, the other end face of the second ring 230 can be directly connected to the body 210, or it can be connected to the first ring 220 (e.g., the outer wall surface of the first ring 220). The specific connection method of the other end face of the second ring 230 can be understood with reference to the following embodiments, and will not be repeated here.

[0075] Furthermore, the first ring 220 or the second ring 230, which is separately configured from the main body 210, can be made of flexible metal to absorb stress through deformation. For example, Kovar alloy can be used to make the first ring 220 and the second ring 230. While ensuring effective deformation, this also allows the first ring 220, the second ring 230, and the insulating cover 100 to have closer coefficients of thermal expansion, thereby greatly reducing welding stress between them and reducing the risk of cracking. Of course, a wavy or corrugated structure can also be formed through stamping or etching processes to enhance stress absorption capacity. The first ring 220 or the second ring 230, which is integrally formed with the main body 210, can be made of the same material as the main body 210 and connected to the insulating cover 100 by brazing or other means to ensure the connection strength between the insulating cover 100 and the lead-out end 200. The welding of the first ring 220, the second ring 230, and the insulating cover 100 can be achieved by brazing, for example, using silver-based brazing filler metal. Vacuum brazing under low-temperature conditions allows for control of the filler metal thickness, effectively dispersing stress and improving sealing. In this embodiment, the double-ring structure disperses stress over a larger area through two independent welding interfaces (inner ring and outer ring). During welding, the flexible outer ring can absorb most of the thermal stress through elastic deformation, while the inner ring can maintain overall strength through a rigid connection.

[0076] It should be noted that the double-ring structure in this embodiment is only to highlight the difference from the single-ring structure of related technologies and to reflect the core concept of this embodiment. Of course, it can be designed as a three-ring structure, a four-ring structure, etc., according to actual needs, and there are no restrictions here.

[0077] This embodiment utilizes a double-ring structure design with a first ring 220 and a second ring 230. This design allows for thinner thicknesses of the first ring 220 and the second ring 230 (radially along the mounting through-hole 102). The thinner thickness of the first ring 220 and the second ring 230 allows for thermal expansion compensation (absorption) of the difference between the lead-out end 200 (metal) and the insulating cover 100 (ceramic) when the interface temperature rises due to welding. This prevents stress concentration and cracking. Furthermore, the double-ring structure of this embodiment forms two independent sealing barriers; even if one ring fails due to stress or external force, the other ring can still maintain its seal.

[0078] It is important to emphasize that, compared to the single-ring configuration in related technologies, the double-ring structure in this embodiment allows for a thinner thickness (radial along the mounting through-hole 102) in each ring. This is more conducive to absorbing welding stress between the lead-out end 200 and the insulating cover 100 through deformation, reducing the risk of cracks caused by stress concentration. Furthermore, the two independent welding interfaces in this embodiment help disperse stress over a larger area, further reducing the risk of microcracks appearing at the interface of the insulating cover 100.

[0079] According to the connection structure between the lead-out end and the insulating cover provided in the embodiments of this application, by setting (e.g., circumferentially) a first ring body 220 and a second ring body 230 on the outer periphery of the body 210, including circumferentially connecting the first ring body 220 to the body 210, and circumferentially connecting the second ring body 230 to the outer periphery of the first ring body 220 and connecting it to the body 210, or the first ring body 220, or the body 210 and the first ring body 220, by welding the first ring body 220 and the second ring body 230 to the surface of the insulating cover 100, the purpose of fixing the lead-out end 200 and the insulating cover 100 can be achieved. In this way, a double-ring structure distributed on the outer periphery of the body 210 is formed. Compared with the single-ring structure in the conventional technology, the thickness of each ring in the double-ring structure can be set to be thinner, which is beneficial to absorb the welding stress between the lead-out end 200 and the insulating cover 100 through the deformation of the double-ring structure during the welding process, and avoid the cracking problem caused by stress concentration. Furthermore, the double-ring structure design, through the superposition of the double-ring welding surfaces, increases the effective welding area, effectively reducing welding stress while also improving the welding strength between the lead-out terminal 200 and the insulating cover 100. Additionally, the double-ring structure design allows for the dispersion of stress at the welding interface, helping to distribute stress over a larger area and further preventing stress concentration. Moreover, the double-ring structure design forms an independent double sealing barrier, improving the connection reliability between the insulating cover 100 and the lead-out terminal 200.

[0080] Below, we will combine the appendix Figure 1 - Appendix Figure 25The specific structure of the connection structure between the lead-out terminal and the insulating cover provided in the embodiments of this application will be described in detail. Figure 4 This is a structural disassembly diagram of the connection structure between the lead-out terminal and the insulating cover provided according to some embodiments of this application. Figure 5 This is a cross-sectional structural diagram of a lead-out terminal 200 provided according to some embodiments of this application.

[0081] like Figures 6-9 As shown, Figure 6 This is a schematic cross-sectional view of another connection structure between the lead-out end and the insulating cover provided according to some embodiments of this application. Figure 7 for Figure 6 Enlarged schematic diagram of the structure at point B. Figure 8 This is a disassembled schematic diagram of another structural connection structure between the lead-out end and the insulating cover provided according to some embodiments of this application. Figure 9 This is a schematic cross-sectional view of the lead-out terminal 200 provided according to some embodiments of this application. In some embodiments, a first annular groove 201 is formed between the first annular body 220 and the body 210, and a second annular groove 202 is formed between the second annular body 230 and the first annular body 220, and the depth of the second annular groove 202 is less than the depth of the first annular groove 201; solder is disposed between the first annular body 220 and the insulating cover 100, and between the second annular body 230 and the insulating cover 100, and the molten solder can be at least partially adsorbed in the second annular groove 202, and can climb along the sidewall of the second annular groove 202 to the bottom of the second annular groove 202.

[0082] Understandably, during the welding process, silver-based solder is coated on the contact surfaces of the first ring 220, the second ring 230, and the insulating cover 100. The molten solder enters the second annular groove 202 due to capillary action and rises along the sidewall of the second annular groove 202 to the bottom of the groove (within...). Figure 7 From a mid-range perspective, this should be the top of the second annular groove 202, which forms a connecting layer between the welding surface of the second annular body 230 and the bottom of the groove after the solder solidifies, enhancing the connection strength between the lead-out end 200 and the insulating cover 100 (equivalent to forming an additional mechanical anchoring structure). Furthermore, since the second annular groove 202 is a shallow groove, during the welding process, the shallow groove allows the brazing filler metal to better wet the groove wall, forming a wider metallurgical bond, which is beneficial to improving the welding strength between the lead-out end 200 and the insulating cover 100.

[0083] It should be noted that, besides designing the depth of the second annular groove 202 to be less than the depth of the first annular groove 201, as mentioned above, the depth of the first annular groove 201 can also be made equal to the depth of the second annular groove 202. This arrangement is beneficial for uniform stress distribution and reduces the risk of stress concentration in a single ring. It also facilitates consistent groove depth parameters during processing, reducing process complexity and improving production efficiency.

[0084] In some embodiments, the lead-out end 200 includes a plurality of first ring bodies 220, which are concentrically arranged and sequentially spaced around the outer periphery of the body 210.

[0085] Specifically, multiple first ring bodies 220 are sleeved on the outer periphery of the body 210. For example, two first ring bodies 220 are sleeved on the outer periphery of the body 210, and combined with a second ring body 230 located on the outer periphery of the first ring bodies 220, a three-ring structure can be formed on the outer periphery of the body 210. The multi-ring structure design can further disperse welding stress and increase the effective welding area, thereby improving the welding strength between the lead-out end 200 and the insulating cover 100.

[0086] Of course, besides designing multiple first ring bodies 220, in one example, the lead-out end 200 can also include multiple second ring bodies 230, which are concentrically arranged and sequentially spaced around the outer periphery of the first ring body 220. Specifically, one first ring body 220 can be designed, and multiple second ring bodies 230 can be designed, similar to the design principle described above, to form a multi-ring structure around the outer periphery of the body 210, with each ring body designed at intervals, so that while allowing each ring body to deform independently, the cracking of the insulating cover 100 caused by stress superposition can be avoided.

[0087] It should be noted that, referring to the connection method between the first ring 220 and the body 210, and the connection method between the second ring 230 and the body 210 and / or the first ring 220, multiple first rings 220 and multiple second rings 230 can be adapted to be designed on the outer periphery of the body 210, without specific limitations. This method of designing two or more rings on the outer periphery of the body 210 is beneficial to dispersing the stress of a single interface (welding surface) in traditional technology to multiple interfaces. While dispersing the stress, the deformation of the extremely thin rings can also absorb the stress, which can greatly reduce the possibility of microcracks in the insulating cover 100 caused by welding stress.

[0088] like Figures 2-13 , Figures 18-21 In some embodiments, at least one of the first ring body 220 and the second ring body 230 is integrally formed with the body 210, while the other is separately disposed from the body 210.

[0089] It is understandable that, such as Figures 10-13 The first ring 220 can be integrally formed with the body 210, while the second ring 230 is separately disposed from the body 210 and connected to the body 210 in subsequent processes by welding or other methods. Alternatively, the second ring 230 can be integrally formed with the body 210, while the first ring 220 is separately disposed from the body 210 and connected to the body 210 in subsequent processes by welding or other methods. Or, as... Figures 2-9In one example, the first ring body 220 and the second ring body 230 are both integrally formed with the body 210.

[0090] The above-mentioned integral formation method can be that the outer periphery of the body 210 extends with a boss, and grooves are cut at the boss by machining methods such as turning to form a first annular groove 201 and / or a second annular groove 202, while the part of the boss between the annular grooves is an annular body.

[0091] In this embodiment, by forming the first ring body 220 and / or combining the two parts, it is beneficial to realize the different functions of the independent first ring body 220 and the second ring body 230. For example, the first ring body 220 is formed integrally with the body 210, which is beneficial to enhance the rigidity of the inner ring. The second ring body 230 is set separately from the body 210, which is beneficial to improve the flexibility of the outer ring and is more conducive to stress absorption during deformation.

[0092] Besides the aforementioned arrangement where one of the first ring body 220 and the second ring body 230 is integrally formed with the body 210, it is also possible for both the first ring body 220 and the second ring body 230 to be separately disposed from the body 210, such as... Figures 14-17 As shown, Figure 14 This is a schematic cross-sectional view of another connection structure between the lead-out end and the insulating cover provided according to some embodiments of this application. Figure 15 for Figure 14 A magnified schematic diagram of the structure at point D. Figure 16 This is a disassembled schematic diagram of another structural connection structure between the lead-out end and the insulating cover provided according to some embodiments of this application. Figure 17 This is a schematic diagram of a first ring body 220 and a second ring body 230 provided according to some embodiments of this application. In some embodiments, the first ring body 220 and the second ring body 230 are an integral structure, and the first ring body 220 and the second ring body 230 are separately disposed from the body 210 in an integral structure.

[0093] It is understandable that by integrally forming the first ring body 220 and the second ring body 230, the second annular groove 202 can be formed by stamping a connecting plate, dividing the connecting plate into the first ring body 220 and the second ring body 230. Alternatively, it can be formed by injection molding. The specific process is not limited here. The connection between the two can be achieved by connecting the first ring body 220, or the second ring body 230, or both the first ring body 220 and the second ring body 230 together to the body 210. Regardless of the connection method, the first annular groove 201 can be formed on the outer periphery of the first ring body 220 and the body 210 by means of the aforementioned boss.

[0094] It should be noted that, in addition to the above-mentioned method of forming the first ring body 220 and the second ring body 230 as a single unit and then connecting them to the body 210, it is also possible to manufacture the first ring body 220 and the second ring body 230 separately and then connect them to the body 210 by welding or other means.

[0095] The split-design double-ring structure can be made of different materials to approximate the thermal expansion coefficient of the insulation shield 100 as closely as possible, thereby reducing welding stress.

[0096] like Figures 10-13 , Figure 10 This is a schematic cross-sectional view of another connection structure between the lead-out end and the insulating cover provided according to some embodiments of this application. Figure 11 for Figure 10 A magnified schematic diagram of the structure at point C. Figure 12 This is a disassembled schematic diagram of another structural connection structure between the lead-out end and the insulating cover provided according to some embodiments of this application. Figure 13 This is a disassembled schematic diagram of another structure of the lead-out terminal 200 provided according to some embodiments of this application. In some embodiments, the body 210 includes a lead-out portion 211 and a plug-in portion 212, the plug-in portion 212 is inserted into the mounting through hole 102, the lead-out portion 211 is connected to the plug-in portion 212 and is located outside the insulating cover 100; a first ring body 220 and a second ring body 230 are respectively disposed around the plug-in portion 212.

[0097] Specifically, to clearly illustrate the placement of the first ring 220 and the second ring 230 relative to the main body 210, this embodiment virtually divides the main body 210 into a lead-out portion 211 and a plug-in portion 212. The lead-out portion 211 and the plug-in portion 212 are arranged sequentially along the axial direction of the mounting through hole 102 on the insulating cover 100, and the lead-out portion 211 is located outside the insulating cover 100. The first ring 220 and the second ring 230 are concentrically arranged with the plug-in portion 212 and surround the outer periphery of the plug-in portion 212. The first ring 220 and the second ring 230 are connected to the lead-out portion 211 so that they are welded to the insulating cover 100 through the welding surfaces of the first ring 220 and the second ring 230 away from the lead-out portion 211, thereby achieving a fixed connection between the lead-out end 200 and the insulating cover 100.

[0098] Regarding the connection method of the first ring 220, the second ring 230 and the lead-out portion 211, in some embodiments, the first ring 220 extends toward the side away from the insulating cover 100 and is connected to the surface of the lead-out portion 211 toward the side facing the insulating cover 100. The second ring 230 is a flexible cover, which includes a first end face and a second end face. The first end face extends toward the insulating cover 100 and is welded to the insulating cover 100. The second end face extends away from the insulating cover 100 and is bent and connected to the surface of the lead-out portion 211 on the side away from the insulating cover 100.

[0099] Specifically, the ring arm of the first ring 220 can be a straight arm segment. This can be understood as the extension direction of the first ring 220 being consistent with the extension direction of the insertion portion 212. The first ring 220 has a connecting end face facing away from the insulating cover 100, which can extend to the lower surface of the lead-out portion 211. In this embodiment, the lower surface of the lead-out portion 211 refers to the surface facing the insulating cover 100. The ring arm of the second ring 230 can be a non-straight arm segment. Specifically, the diameter (corresponding to the second end face) of the second ring 230 near the lead-out portion 211 gradually decreases, so that the ring arm of the second ring 230 near the lead-out portion 211 is an arc-shaped arm segment, while the ring arm (corresponding to the first end face) of the second ring 230 near the insulating cover 100 can still be designed as a straight arm segment parallel to the first ring 220. Furthermore, in this embodiment, the second end face of the second ring 230 extends to the upper surface of the lead-out portion 211 for connection, and the upper surface of the lead-out portion 211 refers to the surface facing away from the insulating cover 100.

[0100] In this embodiment, by connecting the ends of the first ring 220 and the second ring 230 away from the insulating cover 100 to different surfaces of the lead-out portion 211, the deformation length of the flexible cover is greater than that of the first ring 220. This deformation length refers to the dimension in the extension direction of the insertion portion 212. This arrangement allows the second ring 230 of the outer ring to act as the main part absorbing welding stress, effectively reducing welding stress. Conversely, the second ring 230 of the inner ring can enhance the connection strength, ensuring the mechanical connection strength between the lead-out end 200 and the insulating cover 100, and reducing welding failure caused by excessive deformation of the outer ring.

[0101] like Figure 10 and Figure 11 As shown, in some embodiments, the thickness of the second ring 230 is less than the thickness of the first ring 220, and the ring width of the welding surface of the second ring 230 and the insulating cover 100 is less than the ring width of the welding surface of the first ring 220 and the insulating cover 100.

[0102] It is understandable that the flexible cover in this embodiment can be designed to be thinner than the first ring 220. Considering that the deformation length of the flexible cover is greater than that of the first ring 220, this is more conducive to the deformation of the second ring 230, thereby better absorbing welding stress and reducing cracking caused by stress concentration. Correspondingly, based on the design that the thickness of the second ring 230 is less than that of the first ring 220, the ring width of the welding surface between the second ring 230 and the insulating cover 100 is smaller than the ring width of the welding surface between the first ring 220 and the insulating cover 100. In this embodiment, the ring width is defined as the width of the end faces of the first ring 220 and the second ring 230 facing the insulating cover 100, and the direction of this width is consistent with the radial direction of the ring. The narrower ring width design of the second ring 230 in this embodiment can further reduce welding stress accumulation and prevent local overheating and cracking of the insulating cover 100.

[0103] It should be noted that in this embodiment, the end faces (welding surfaces) of the first ring 220 and the second ring 230 facing the insulating cover 100 are both planes parallel to the surface of the insulating cover 100. This planar design allows the solder to be evenly distributed between the first ring 220, the second ring 230, and the insulating cover 100 after melting, avoiding localized solder accumulation or uneven gaps caused by uneven end faces. In other words, the solder placed between the rings and the insulating cover 100 can spread evenly in the planar contact area after melting, forming a weld layer of uniform thickness, further reducing the risk of stress concentration after welding, thereby enhancing the stability and reliability of the connection structure.

[0104] like Figures 22-25 As shown, Figure 22 This is a schematic cross-sectional view of another connection structure between the lead-out end and the insulating cover provided according to some embodiments of this application. Figure 23 for Figure 22 Enlarged schematic diagram of the structure at point F. Figure 24 This is a disassembled schematic diagram of another structural connection structure between the lead-out end and the insulating cover provided according to some embodiments of this application. Figure 25 This is a schematic diagram of another structure of the first ring 220 and the second ring 230 provided according to some embodiments of this application. In some embodiments, the cross-section of the second ring 230 along the axial direction of the mounting through hole 102 is arc-shaped or a transition curve. One end of the second ring 230 is welded to the insulating cover 100, and the other end of the second ring 230 is sealed and connected to the outer wall of the first ring 220.

[0105] Understandably, in scenarios where both the first ring 220 and the second ring 230 are separate from the main body 210, the structure of the first ring 220 can also be designed as an inverted T-shape. That is, the thicker side of the first ring 220 is welded to the insulating cover 100. During welding, the solder flows along a certain path under the action of surface tension and gravity. Since the radial dimension of the contact surface of the first ring 220 is relatively large, it can, to a certain extent, prevent the solder from continuing to climb upwards, causing the solder to concentrate more in the contact area between the first ring 220 and the insulating cover 100 and at the angle between the two sides of the welding surface, thereby reducing the possibility of the solder climbing to other unnecessary areas. The portion of the first ring 220 between the lead-out portion 211 and the welding surface can be designed to be extremely thin, which is beneficial for absorbing welding stress during deformation.

[0106] Based on the above embodiment of suppressing solder creep through the structural design of the first ring 220, the ring arm of the second ring 230 can be designed as an arc or a transition curve. The second ring 230 has two opposing end faces, one of which is welded to the insulating cover 100, and the other end is sealed to the outer wall of the first ring 220. Specifically, the second ring 230 can be welded to the outer wall of the first ring 220. The second ring 230 provided in this embodiment can also be designed to be extremely thin so as to absorb the welding stress as the main deformation, thereby avoiding the cracking of the insulating cover 100 due to stress concentration.

[0107] It can be further understood that since the second ring body 230 is connected to the outer wall of the first ring body 220, the depth of the corresponding second ring groove 202 is less than the depth of the first ring groove 201. The shallower ring groove design allows the solder to climb up the groove wall of the second ring groove 202 to the top. The solder at this point can form a mechanical anchoring structure after solidification, thereby improving the peel strength between the second ring body 230 and the insulating cover 100.

[0108] like Figures 18-21 As shown, Figure 18 This is a schematic cross-sectional view of another connection structure between the lead-out end and the insulating cover provided according to some embodiments of this application. Figure 19 for Figure 18 A magnified schematic diagram of the structure at point E in the middle. Figure 20 This is a disassembled schematic diagram of another structural connection structure between the lead-out end and the insulating cover provided according to some embodiments of this application. Figure 21 This is a schematic diagram of the structure of an insulating cover 100 (annular groove 103) provided according to some embodiments of this application. In some embodiments, the insulating cover 100 has an annular groove 103 formed on the connection surface with the lead-out end 200. The annular groove 103 is located between the first ring body 220 and the second ring body 230 to isolate the welding surfaces of the first ring body 220, the second ring body 230 and the insulating cover 100.

[0109] Specifically, an annular groove 103 is formed on the end face of the insulating cover 100 between the two rings (the first ring 220 and the second ring 230). This annular groove 103 can be concentrically arranged with the second annular groove 202 to form a stress isolation band. The arrangement of this isolation band can block the stress transmission path (the stress generated at the welding surface of the first ring 220 and the insulating cover 100, and the stress generated at the welding surface of the second ring 230 and the insulating cover 100), avoiding stress interaction. At the same time, the groove can accommodate excess solder, preventing it from flowing into the cavity 101 and improving the flatness of the welding surface.

[0110] It should be noted that the groove constructed on the end face of the insulating cover 100 in this embodiment can be applied to any of the above embodiments.

[0111] 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.

[0112] 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 lead-out terminal and an insulating cover, characterized in that, The connection structure between the lead-out end and the insulating cover includes: An insulating cover (100) is provided with a mounting through hole (102); Lead-out end (200), the lead-out end (200) includes at least two rings, the at least two rings are respectively arranged around the mounting through hole (102) without crossing, and are respectively welded to the insulating cover (100), the at least two rings and the insulating cover (100) can respectively form annular welding sealing surfaces surrounding the mounting through hole (102); The at least two rings are capable of being deformed under stress during the welding of the lead-out end (200) to the insulating cover (100) to absorb welding stress.

2. The connection structure of a lead and an insulating cover according to claim 1, wherein The lead-out end (200) includes a body (210), and the at least two rings include a first ring (220) and a second ring (230). The body (210) is inserted into the mounting through hole (102), the first ring (220) is arranged around the mounting through hole (102), and the second ring (230) is arranged around the first ring (220). One end of the first ring (220) and / or the second ring (230) away from the insulating cover (100) is connected to the portion of the body (210) located outside the insulating cover (100).

3. The connection of a lead-out terminal and an insulating cover according to claim 2, characterized in that, A first annular groove (201) is formed between the first annular body (220) and the body (210), and a second annular groove (202) is formed between the second annular body (230) and the first annular body (220), and the depth of the second annular groove (202) is less than the depth of the first annular groove (201); The solder is disposed between the first ring body (220) and the insulating cover (100), and between the second ring body (230) and the insulating cover (100), and the molten solder can be at least partially adsorbed in the second ring groove (202), and can climb along the side wall of the second ring groove (202) to the bottom of the second ring groove (202).

4. The connection structure of the lead-out terminal and the insulating cover according to claim 2, characterized by The lead-out end (200) includes a plurality of first ring bodies (220), which are concentrically arranged and sequentially spaced around the outer periphery of the body (210); And / or, the lead-out end (200) includes a plurality of second ring bodies (230), the plurality of second ring bodies (230) being concentrically arranged and sequentially spaced around the outer periphery of the first ring body (220).

5. The connection structure of a lead and an insulating cover according to claim 2, wherein At least one of the first ring body (220) and the second ring body (230) is integrally formed with the body (210), and the other is separately disposed from the body (210); And / or, the first ring body (220) and the second ring body (230) are both integrally formed with the body (210).

6. The connection of a lead-out terminal and an insulating cover according to claim 2, wherein The first ring body (220) and the second ring body (230) are an integral structure, and the first ring body (220) and the second ring body (230) are separately set from the main body (210) in an integral structure.

7. The outlet and boot connection of claim 2, wherein: The main body (210) includes a lead-out portion (211) and a plug portion (212). The plug portion (212) is inserted into the mounting through hole (102). The lead-out portion (211) is connected to the plug portion (212) and located outside the insulating cover (100). The first ring body (220) and the second ring body (230) are respectively arranged around the plug portion (212).

8. The connection of a lead-out terminal and an insulating cover according to claim 7, wherein The first ring (220) extends toward the side away from the insulating cover (100) and is connected to the surface of the lead-out portion (211) facing the insulating cover (100). The second ring (230) is a flexible cover, which includes a first end face and a second end face. The first end face extends toward the insulating cover (100) and is welded to the insulating cover (100). The second end face extends away from the insulating cover (100) and is bent and connected to the surface of the lead-out portion (211) facing away from the insulating cover (100).

9. The outlet and boot connection of claim 8, wherein, The thickness of the second ring (230) is less than the thickness of the first ring (220), and the ring width of the welding surface of the second ring (230) and the insulating cover (100) is less than the ring width of the welding surface of the first ring (220) and the insulating cover (100).

10. The connection structure between the lead-out end and the insulating cover according to claim 2, characterized in that, The second ring (230) has an arc-shaped or transition curve in cross-section along the axial direction of the mounting through hole (102). One end of the second ring (230) is welded to the insulating cover (100), and the other end of the second ring (230) is sealed around the outer wall of the first ring (220).

11. The connection of a lead-out and an insulating cover according to any one of claims 2 to 10, characterized in that, The insulating cover (100) has an annular groove (103) on the connection surface with the lead-out end (200). The annular groove (103) is located between the first ring body (220) and the second ring body (230) to isolate the welding surfaces of the first ring body (220), the second ring body (230) and the insulating cover (100).

12. The outlet and boot connection of claim 1, wherein: The insulating cover (100) is made of ceramic.

13. A relay characterized by comprising: It includes the connection structure between the lead-out terminal and the insulating cover as described in any one of claims 1-12.

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