Large-diameter vacuum arc-extinguishing chamber device capable of improving air tightness

Abstract

The invention relates to the technical field of vacuum arc extinguish chambers, and discloses a large-diameter vacuum arc extinguish chamber device capable of improving air tightness, which comprises an upper ceramic shell assembly, a shielding cylinder and a lower ceramic shell assembly which are sequentially arranged from top to bottom, the shielding cylinder comprises a cylinder body, an upper shielding cover and a lower shielding cover; wherein the upper shielding case is located in the upper ceramic shell assembly, the lower shielding case is located in the lower ceramic shell assembly, and one end of the upper shielding case, the top of the cylinder body and the bottom of the upper ceramic shell assembly are welded and connected through the upper sealing ring; and the lower shielding cover, the bottom of the cylinder and the top of the lower ceramic shell assembly are welded and connected through a lower sealing ring. According to the invention, the technical problems of air leakage and part breakage caused by stress after sealing of large-diameter parts are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vacuum interrupter, in particular to a large-diameter vacuum interrupter device capable of improving air tightness. BACKGROUND

[0002] The current global energy transformation process is accelerating, and green power grid construction has become the core direction of the development of the power industry. Environment-friendly switchgear is listed as the key procurement and development direction in power grid construction due to its advantages such as no pollutant emission and low operation and maintenance cost. As the core component of environment-friendly switchgear, high-voltage vacuum interrupter is not only the key carrier for the upgrade of switchgear from traditional technology to advanced technology, but also the core link for leading the transformation of power grid equipment to green, intelligent and efficient. The technical development level and industrialization process of high-voltage vacuum interrupter directly determine the core competitiveness of power grid equipment and deeply affect the future pattern of global power equipment industry. Under this background, high-voltage vacuum interrupter has become one of the optimal solutions to adapt to the needs of green power grid construction due to its excellent arc extinguishing performance, environmental protection characteristics and operation reliability.

[0003] However, the processing and manufacturing of high-voltage vacuum interrupter belong to the typical extreme manufacturing category, which is a complex system engineering integrating material science, vacuum brazing technology and electrical engineering, and its manufacturing difficulty is much higher than that of medium-voltage vacuum interrupter products. In the entire manufacturing process, vacuum brazing is the core link with the highest technical barrier, and the biggest technical challenge of this link is the multi-material co-brazing process, which needs to realize the reliable welding of materials such as oxygen-free copper, stainless steel and ceramic with significantly different thermal expansion coefficients in one or several heating cycles. Due to the large difference in linear expansion coefficients between metal materials and ceramic materials, ceramic components are easily cracked due to uneven thermal stress distribution during welding, or brittle phases are generated in the weld area, which seriously affects the welding quality.

[0004] To solve the above-mentioned multi-material welding matching problem, the existing technology usually implements strict control from multiple dimensions such as welding structure optimization, precise control of welding temperature curve, guarantee of heating uniformity and regulation of cooling process. Among them, the reliability of the sealing process of ceramic and metal directly determines the sealing performance, mechanical strength and electrical insulation performance of high-voltage vacuum interrupter, which is a key factor affecting the service life and operation safety of the interrupter.

[0005] Although the above technical control ideas have been formed in the industry, in actual industrialization application, the sealing processing of large-diameter parts still faces prominent technical bottlenecks: the residual stress generated in the sealing process cannot be effectively released, which leads to problems such as air tightness failure (gas leakage) or mechanical structure damage (part fracture) after the sealing of the parts, seriously restricting the development of high-voltage vacuum arc chambers to larger capacity and higher voltage grade, and it is difficult to fully meet the urgent needs of green power grid for high-end electric power equipment. Therefore, it is urgent to break through the technical limitations of existing vacuum brazing and ceramic and metal sealing processes, solve the stress control problem of large-diameter part sealing, and improve the manufacturing reliability of high-voltage vacuum arc chambers. SUMMARY

[0006] In order to overcome the defects of the prior art, the purpose of the present application is to provide a large-diameter vacuum arc chamber device capable of improving air tightness, so as to solve the technical problems of how to avoid gas leakage and part fracture caused by stress after the sealing of large-diameter parts.

[0007] The present application is realized by the following technical solutions: In a first aspect, the present application provides a large-diameter vacuum arc chamber device capable of improving air tightness, comprising an upper ceramic housing assembly, a shielding cylinder and a lower ceramic housing assembly arranged in sequence from top to bottom. The shielding cylinder comprises a cylinder body, an upper shielding cover and a lower shielding cover. The upper shielding cover is located in the upper ceramic housing assembly, and the lower shielding cover is located in the lower ceramic housing assembly. One end of the upper shielding cover, the top of the cylinder body and the bottom of the upper ceramic housing assembly are all welded and connected through an upper sealing ring. The lower shielding cover, the bottom of the cylinder body and the top of the lower ceramic housing assembly are all welded and connected through a lower sealing ring.

[0008] Preferably, one end of the upper shielding cover close to the upper sealing ring is provided as a first welding end, one end of the top of the cylinder body close to the upper sealing ring is provided as a second welding end, and one end of the bottom of the upper ceramic housing assembly close to the upper sealing ring is provided as a third welding end. The upper sealing ring is provided with a stepped welding surface corresponding to the first welding end, the second welding end and the third welding end. The stepped welding surface comprises a first welding surface, a second welding surface and a third welding surface. The first welding end is welded on the first welding surface, the second welding end is welded on the second welding surface, and the third welding end is welded on the third welding surface.

[0009] Preferably, one end of the lower shielding cover close to the lower sealing ring is provided as a fourth welding end, one end of the bottom of the cylinder body close to the lower sealing ring is provided as a fifth welding end, and one end of the bottom of the lower ceramic housing assembly close to the lower sealing ring is provided as a sixth welding end. The lower sealing ring is provided with stepped welding surfaces corresponding to the fourth welding end, the fifth welding end, and the sixth welding end; the stepped welding surfaces include the fourth welding surface, the fifth welding surface, and the sixth welding surface; The fourth welding end is welded to the fourth welding surface, the fifth welding end is welded to the fifth welding surface, and the sixth welding end is welded to the sixth welding surface.

[0010] Preferably, the bottom diameter of the upper ceramic shell assembly, the top diameter of the lower ceramic shell assembly, and the diameters of both ends of the cylinder correspond to the ring diameters of the upper sealing ring and the lower sealing ring, respectively.

[0011] Preferably, the upper sealing ring and the lower sealing ring have the same structure.

[0012] Furthermore, the upper sealing ring includes a sealing ring body; The sealing ring includes a ring body with a stepped plane for welding to one end of the upper shield, the top of the cylinder, and the bottom of the upper ceramic shell assembly, respectively.

[0013] Furthermore, the stepped plan includes a first platform, a second platform, and a third platform; The first platform is located on the inner sidewall of the ring and is used to be welded to one end of the upper shielding cover. The second unit is located at the top of the ring and is used for welding connection to the bottom of the upper ceramic housing assembly; The third body is located at the bottom of the ring and is used for welding connection to the top of the cylinder.

[0014] Furthermore, a connecting rod is provided on the outer wall of the ring, and the ring is fixed with a pressure equalization cover by the connecting rod.

[0015] Preferably, the upper sealing ring, lower sealing ring, upper ceramic shell assembly, shielding cylinder, and lower ceramic shell assembly are all coaxially arranged.

[0016] Preferably, the upper ceramic shell assembly includes a moving tube shell for the arc-extinguishing chamber and a moving tube core for the arc-extinguishing chamber; the lower ceramic shell assembly includes a stationary tube shell for the arc-extinguishing chamber and a stationary tube core for the arc-extinguishing chamber. The bottom of the arc-extinguishing chamber moving tube shell, one end of the upper shielding cover, and the top of the cylinder are all welded together by an upper sealing ring. The top, lower shield, and bottom of the static tube shell of the arc-extinguishing chamber are all welded together by a lower sealing ring. The moving tube core of the arc-extinguishing chamber is installed with an upper shield inside the outer shell of the moving tube of the arc-extinguishing chamber, and the stationary tube core of the arc-extinguishing chamber is installed with a lower shield inside the outer shell of the stationary tube of the arc-extinguishing chamber. The moving tube core and the stationary tube core of the arc-extinguishing chamber are in contact inside the cylinder.

[0017] Compared with the prior art, the present application has the following beneficial technical effects: The present application provides a large-diameter vacuum arc-extinguishing chamber device with improved air tightness. The upper sealing ring simultaneously realizes the welding and fixation of the upper shielding cover one end, the top of the cylinder, and the bottom of the upper ceramic housing assembly. The lower sealing ring synchronously connects the lower shielding cover, the bottom of the cylinder, and the top of the lower ceramic housing assembly. The synchronous welding of the three components through a single sealing ring forms an integrated connection node for the three key components, reducing the number of welding seams and the risk of air leakage at the seams. The sealing ring, as an intermediate transition component, can be made of an alloy material that matches the thermal expansion coefficients of the ceramic housing and the shielding cylinder, providing thermal expansion buffering. During the welding process, the sealing ring can absorb the thermal expansion difference between the ceramic and the metal material, relieve the thermal stress caused by high temperature during welding, release residual stress, and avoid cracking of the sealing surface or part breakage caused by long-term stress accumulation, thereby fundamentally solving the air leakage and breakage problems after sealing of large-diameter parts.

[0018] Further, the stepped welding surface realizes precise positioning and fitting of each welding end, reducing the source of stress generation from the aspect of assembly precision, ensuring that the three welding ends are in the preset position before welding, tightly fitted and without obvious gaps, reducing the filling amount during welding, and avoiding uneven distribution of welding stress caused by gaps. It provides protection for uniform stress dispersion from the assembly link. Secondly, the stepped welding surface realizes layered release of welding stress through spatial layout optimization, solving the problem of thermal stress conflict during welding of different material components. The three welding ends are placed at different heights of the welding surface, making the welding areas of each component independent in space. The heat transfer path during welding is clearer, avoiding local high temperature caused by heat concentration and superposition, effectively relieving the thermal stress caused by mismatched thermal expansion coefficients, and reducing the risk of part breakage caused by residual stress after welding.

[0019] Further, the present application fixes the equalizing cover through the connecting rod of the ring body outer wall, so that the equalizing cover accurately covers the sealing part and the surrounding key area. The arc-shaped structure of the equalizing cover is used to redistribute the electric field, dispersing the concentrated electric field strength to a larger area, avoiding corona discharge or insulation aging caused by local high electric field, and realizing uniform distribution of the external electric field of the arc-extinguishing chamber tube. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 Figure 1 is a schematic diagram of a large-diameter vacuum arc-extinguishing chamber device in the embodiment of the present application; Figure 2 Figure 2 is a schematic diagram of an oxygen-free copper sealing ring in the large-diameter vacuum arc-extinguishing chamber device in the embodiment of the present application; Figure 3 Figure 3 is a schematic diagram of the A part in Figure 1; Figure 2 Figure 4 is an enlarged schematic diagram of the A part in Figure 3; Figure 4It is a whole view of the large-diameter vacuum interrupter device in the embodiment of the present application. Figure 5 It is a side sectional view of the oxygen-free copper sealing ring in the embodiment of the present application. Figure 6 It is a top view of the oxygen-free copper sealing ring in the embodiment of the present application. In the figure: 1, upper sealing ring; 2, lower sealing ring; 3, shielding cylinder; 4, upper ceramic assembly; 5, lower ceramic assembly. 11, sealing ring body; 12, equalizing cover. 111, ring body; 112, first table body; 113, second table body; 114, connecting rod; 115, third table body. 31, cylinder body; 32, upper shielding cover; 33, lower shielding cover. 41, interrupter moving tube shell; 42, interrupter moving tube core. 51, interrupter static tube shell; 52, interrupter static tube core. DETAILED DESCRIPTION In order to make the person skilled in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.

[0021] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0022] The purpose of the present application is to provide a large-diameter vacuum interrupter device that can improve air tightness, to solve the technical problem of how to avoid air leakage and part fracture caused by stress after sealing of large-diameter parts.

[0023] The present application will be described in further detail below in conjunction with the drawings: Embodiment 1 Reference is made to Figure 1 andFigure 4 As shown in the drawings, in one embodiment of the present application, a large-diameter vacuum interrupter device with improved air tightness is provided, which comprises an upper ceramic housing assembly 4, a shielding cylinder 3 and a lower ceramic housing assembly 5 arranged in sequence from top to bottom; the shielding cylinder 3 comprises a cylinder body 31, an upper shielding cover 32 and a lower shielding cover 33; wherein the upper shielding cover 32 is located in the upper ceramic housing assembly 4, the lower shielding cover 33 is located in the lower ceramic housing assembly 5, and one end of the upper shielding cover 32, the top of the cylinder body 31 and the bottom of the upper ceramic housing assembly 4 are all welded and connected through an upper sealing ring 1; the lower shielding cover 33, the bottom of the cylinder body 31 and the top of the lower ceramic housing assembly 5 are all welded and connected through a lower sealing ring 2, as shown in the drawings. Figure 2

[0024] Wherein, one end of the upper shielding cover 32 close to the upper sealing ring 1 is provided as a first welding end, and one end of the top of the cylinder body 31 close to the upper sealing ring 1 is provided as a second welding end; one end of the bottom of the upper ceramic housing assembly 4 close to the upper sealing ring 1 is provided as a third welding end; The upper sealing ring 1 is provided with a stepped welding surface corresponding to the first welding end, the second welding end and the third welding end; the stepped welding surface comprises a first welding surface, a second welding surface and a third welding surface; The first welding end is welded on the first welding surface, the second welding end is welded on the second welding surface, and the third welding end is welded on the third welding surface.

[0025] Wherein, one end of the lower shielding cover 33 close to the lower sealing ring 2 is provided as a fourth welding end, and one end of the bottom of the cylinder body 31 close to the lower sealing ring 2 is provided as a fifth welding end; one end of the bottom of the lower ceramic housing assembly 5 close to the lower sealing ring 2 is provided as a sixth welding end; The lower sealing ring 2 is provided with a stepped welding surface corresponding to the fourth welding end, the fifth welding end and the sixth welding end; the stepped welding surface comprises a fourth welding surface, a fifth welding surface and a sixth welding surface; The fourth welding end is welded on the fourth welding surface, the fifth welding end is welded on the fifth welding surface, and the sixth welding end is welded on the sixth welding surface.

[0026] Embodiment 2 ​In one embodiment of the present application, a large-diameter vacuum interrupter device with improved air tightness is provided, which comprises an upper ceramic housing assembly 4, a shielding cylinder 3 and a lower ceramic housing assembly 5 arranged in sequence from top to bottom; the shielding cylinder 3 comprises a cylinder body 31, an upper shielding cover 32 and a lower shielding cover 33; wherein the upper shielding cover 32 is located in the upper ceramic housing assembly 4, the lower shielding cover 33 is located in the lower ceramic housing assembly 5, and one end of the upper shielding cover 32, the top of the cylinder body 31 and the bottom of the upper ceramic housing assembly 4 are all welded and connected through an upper sealing ring 1; the lower shielding cover 33, the bottom of the cylinder body 31 and the top of the lower ceramic housing assembly 5 are all welded and connected through a lower sealing ring 2.

[0027] Wherein the bottom diameter of the upper ceramic housing assembly 4, the top diameter of the lower ceramic housing assembly 5 and the diameters of both ends of the cylinder body 31 correspond to the ring body diameters of the upper sealing ring 1 and the lower sealing ring 2 respectively.

[0028] The upper sealing ring 1 and the lower sealing ring 2 in the present embodiment have the same structure.

[0029] Wherein, according to Figure 3 , Figure 5 and Figure 6 , the upper sealing ring 1 comprises a sealing ring body 11; the sealing ring body 11 comprises a ring body 111, which is provided with a stepped plane for welding and connecting with one end of the upper shielding cover 32, the top of the cylinder body 31 and the bottom of the upper ceramic housing assembly 4 respectively.

[0030] Wherein, the stepped plane comprises a first platform body 112, a second platform body 113 and a third platform body 115; the first platform body 112 is arranged at the inner side wall of the ring body 111 for welding and connecting with one end of the upper shielding cover 32; the second platform body 113 is arranged at the top of the ring body 111 for welding and connecting with the bottom of the upper ceramic housing assembly 4; the third platform body 115 is arranged at the bottom of the ring body 111 for welding and connecting with the top of the cylinder body 31. In the present embodiment, the outer side wall of the ring body 111 is provided with a connecting rod 14, and the ring body 111 is fixedly provided with a voltage equalizing cover 12 through the connecting rod 14.

[0031] In the present embodiment, the upper sealing ring 1, the lower sealing ring 2, the upper ceramic housing assembly 4, the shielding cylinder 3 and the lower ceramic housing assembly 5 are coaxially arranged.

[0032] The upper ceramic housing assembly 4 in the embodiment comprises an arc-extinguishing chamber moving tube housing 41 and an arc-extinguishing chamber moving tube core 42; the lower ceramic housing assembly 5 comprises an arc-extinguishing chamber static tube housing 51 and an arc-extinguishing chamber static tube core 52; the bottom of the arc-extinguishing chamber moving tube housing 41, one end of the upper shielding cover 32 and the top of the cylinder 31 are all welded and connected through the upper sealing ring 1; the top of the arc-extinguishing chamber static tube housing 51, the lower shielding cover 33 and the bottom of the cylinder 31 are all welded and connected through the lower sealing ring 2; the arc-extinguishing chamber moving tube core 42 is arranged through the upper shielding cover 32 in the arc-extinguishing chamber moving tube housing 41, and the arc-extinguishing chamber static tube core 52 is arranged through the lower shielding cover 33 in the arc-extinguishing chamber static tube housing 51; the arc-extinguishing chamber moving tube core 42 and the arc-extinguishing chamber static tube core 52 are in contact in the cylinder 31.

[0033] In the embodiment, the once welding of the parts with three different expansion coefficients is completed by using three different surfaces, the cracking and gas leakage problems caused by the stress of the high-temperature sealing of the large-diameter part are solved, the sealing stress at the position is reduced by calculating the vertical edge height of the sealing ring, the thickness of the sealing position and the sealing position in the porcelain shell, the welding area is large enough to ensure the welding strength, and at the same time, in order to meet the once welding of the upper and lower shielding covers, the upper and lower sealing rings adopt an asymmetric structure in the embodiment, the once welding of the upper and lower shielding covers is realized, and the problem that the once welding of the upper and lower shielding covers cannot be completed is solved; the welding with the shielding cylinder 3 is completed by another plane of the upper and lower sealing rings; and the side wall of the upper and lower sealing rings is used to fix the voltage-sharing ring, and the uniform distribution of the electric field of the arc-extinguishing chamber tube is realized.

[0034] The assembly process of the application is as follows: First, place the lower ceramic housing assembly 5. Put high-temperature solder on the top plane of the lower ceramic housing assembly 5.

[0035] Place the lower sealing ring 2 on the lower ceramic housing assembly 5, weld the first surface of the lower sealing ring 2 with the ceramic housing, and design the reasonable size to make the welding position of the lower sealing ring 2 be at the middle position of the lower ceramic housing assembly 5.

[0036] Put high-temperature solder on the second surface of the lower sealing ring 2, and weld the plane of the lower shielding cover 33 on the second surface of the lower sealing ring 2.

[0037] Put high-temperature solder on the third surface of the lower sealing ring 2, and then weld the bottom of the cylinder 31 to the third surface of the lower sealing ring 2.

[0038] Put high-temperature solder on the top of the cylinder 31, and weld the first surface of the upper sealing ring 1 to the top of the cylinder 31; Put high-temperature solder on the second surface of the upper sealing ring 1, and weld the plane of the upper shielding cover 33 on the second surface of the upper sealing ring 1; Put high-temperature solder on the third face of the upper sealing ring 1, and weld the bottom face of the upper ceramic shell assembly 4 on the third face of the upper sealing ring 1; Finally, assemble the equalizing ring outside the upper and lower sealing rings.

[0039] In summary, the application realizes the matching welding of ceramic, oxygen-free copper and stainless steel through the structural design of the upper sealing ring 1 and the lower sealing ring 2, and the size of the sealing ring is reasonably designed by calculating the welding area, welding position and height of the sealing ring, and the one-time welding of the ceramic shell and the shielding cylinder and the two-end shielding cover is realized through the structural design of the three different planes of the sealing ring, which ensures the perfect matching of the materials with large differences in thermal expansion coefficients of oxygen-free copper, stainless steel and ceramic in one-time heating, and avoids the stress release cracking problem of large-diameter parts after sealing.

[0040] The application performs the thin edge processing at the place welded with the ceramic shell, reduces the sealing stress at the place, and reserves space for the welding stress release due to the higher height of the oxygen-free copper sealing ring in the axial direction; the welding at the place welded with the shielding cover is flat surface welding, and the welding area is large enough to ensure the welding strength.

[0041] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the application and not to limit it, although the application has been described in detail with reference to the above examples, those skilled in the art should understand that: the specific embodiments of the application can still be modified or replaced equivalently without departing from the spirit and scope of the application, any modification or equivalent replacement without departing from the spirit and scope of the application should be covered in the protection scope of the claims of the application.

Claims

1. A large-diameter vacuum interrupter device with improved airtightness, characterized in that, It includes an upper ceramic shell assembly (4), a shielding cylinder (3), and a lower ceramic shell assembly (5) arranged sequentially from top to bottom; The shielding cylinder (3) includes a cylinder body (31), an upper shielding cover (32) and a lower shielding cover (33); The upper shield (32) is located inside the upper ceramic shell assembly (4), and the lower shield (33) is located inside the lower ceramic shell assembly (5). One end of the upper shield (32), the top of the cylinder (31), and the bottom of the upper ceramic shell assembly (4) are all welded together by the upper sealing ring (1). The lower shield (33), the bottom of the cylinder (31), and the top of the lower ceramic shell assembly (5) are all welded together by the lower sealing ring (2).

2. The large-diameter vacuum interrupter device with improved airtightness according to claim 1, characterized in that, The upper shield (32) is provided with the first welding end near the upper sealing ring (1), the top of the cylinder (31) is provided with the second welding end near the upper sealing ring (1), and the bottom of the upper ceramic shell assembly (4) is provided with the third welding end near the upper sealing ring (1). The upper sealing ring (1) is provided with stepped welding surfaces corresponding to the first welding end, the second welding end and the third welding end; the stepped welding surfaces include the first welding surface, the second welding surface and the third welding surface; The first welding end is welded to the first welding surface, the second welding end is welded to the second welding surface, and the third welding end is welded to the third welding surface.

3. The large-diameter vacuum interrupter device with improved airtightness according to claim 1, characterized in that, The lower shield (33) is provided with the fourth welding end near the lower sealing ring (2), and the bottom of the cylinder (31) is provided with the fifth welding end near the lower sealing ring (2); the bottom of the lower ceramic shell assembly (5) is provided with the sixth welding end near the lower sealing ring (2). The lower sealing ring (2) is provided with stepped welding surfaces corresponding to the fourth welding end, the fifth welding end and the sixth welding end; the stepped welding surfaces include the fourth welding surface, the fifth welding surface and the sixth welding surface; The fourth welding end is welded to the fourth welding surface, the fifth welding end is welded to the fifth welding surface, and the sixth welding end is welded to the sixth welding surface.

4. The large-diameter vacuum interrupter device with improved airtightness according to claim 1, characterized in that, The bottom diameter of the upper ceramic shell assembly (4), the top diameter of the lower ceramic shell assembly (5), and the diameters of both ends of the cylinder (31) correspond to the ring diameters of the upper sealing ring (1) and the lower sealing ring (2), respectively.

5. A large-diameter vacuum interrupter device with improved airtightness according to claim 1, characterized in that, The upper sealing ring (1) and the lower sealing ring (2) have the same structure.

6. A large-diameter vacuum interrupter device with improved airtightness according to claim 5, characterized in that, The upper sealing ring (1) includes a sealing ring body (11); The sealing ring (11) includes a ring (111) which has a stepped plane for welding to one end of the upper shield (32), the top of the cylinder (31) and the bottom of the upper ceramic shell assembly (4), respectively.

7. A large-diameter vacuum interrupter device with improved airtightness according to claim 6, characterized in that, The stepped plane includes a first platform (112), a second platform (113), and a third platform (115). The first platform (112) is located on the inner side wall of the ring (111) and is used to weld to one end of the upper shield (32); The second body (113) is disposed on top of the ring body (111) for welding connection to the bottom of the upper ceramic housing assembly (4); The third body (115) is located at the bottom of the ring body (111) and is used for welding connection to the top of the cylinder body (31).

8. A large-diameter vacuum interrupter device with improved airtightness according to claim 6, characterized in that, A connecting rod (14) is provided on the outer wall of the ring (111), and a pressure equalization cover (12) is fixedly provided on the ring (111) through the connecting rod (14).

9. A large-diameter vacuum interrupter device with improved airtightness according to claim 1, characterized in that, The upper sealing ring (1), lower sealing ring (2), upper ceramic shell assembly (4), shielding cylinder (3), and lower ceramic shell assembly (5) are all coaxially arranged.

10. A large-diameter vacuum interrupter device with improved airtightness according to claim 1, characterized in that, The upper ceramic shell assembly (4) includes an arc-extinguishing chamber moving tube shell (41) and an arc-extinguishing chamber moving tube core (42); the lower ceramic shell assembly (5) includes an arc-extinguishing chamber stationary tube shell (51) and an arc-extinguishing chamber stationary tube core (52). The bottom of the arc-extinguishing chamber moving tube shell (41), one end of the upper shield (32) and the top of the cylinder (31) are all welded together by the upper sealing ring (1); The top of the static tube shell (51) of the arc-extinguishing chamber, the lower shield (33) and the bottom of the cylinder (31) are all welded together by the lower sealing ring (2); The moving tube core (42) of the arc-extinguishing chamber is installed inside the moving tube shell (41) of the arc-extinguishing chamber through the upper shield (32), and the stationary tube core (52) of the arc-extinguishing chamber is installed inside the stationary tube shell (51) of the arc-extinguishing chamber through the lower shield (33). The moving tube core (42) of the arc-extinguishing chamber and the stationary tube core (52) of the arc-extinguishing chamber are in contact inside the cylinder (31).

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