Shielding cylinder-porcelain shell assembly, processing method thereof and vacuum arc-extinguishing chamber

Abstract

The invention belongs to the technical field of vacuum arc extinguish chambers, and discloses a shielding cylinder-porcelain shell assembly, a processing method thereof and a vacuum arc extinguish chamber, the shielding cylinder-porcelain shell assembly comprises a porcelain shell, a shielding cylinder and a fixing ring; an annular step is arranged on the inner wall of the porcelain shell; the upper end face of the annular step is a horizontal plane, and the lower end face of the annular step is an inclined plane. The shielding cylinder is arranged in the porcelain shell; wherein the outer wall of the shielding cylinder is provided with a cylinder body inclined surface, and the cylinder body inclined surface abuts against the lower end surface of the annular step; the fixing ring is arranged on the upper end face of the annular step and arranged on the outer side of the upper end opening of the shielding cylinder. Wherein one end of the fixing ring is welded and fixed with the upper port of the shielding cylinder, and the other end of the fixing ring abuts against the upper end face of the annular step; according to the invention, the fixed ring is welded with the upper port of the shielding cylinder, and the cylinder inclined surface of the shielding cylinder is abutted against the lower end surface of the annular step of the porcelain shell, so that reliable fixation of the shielding cylinder and the porcelain shell is realized, the pressure resistance of a product is ensured, and the manufacturing cost of the product is effectively reduced.

Description

Technical Field

[0001] This invention belongs to the field of vacuum interrupter technology, and specifically relates to a shielding cylinder-ceramic shell assembly, its processing method, and a vacuum interrupter. Background Technology

[0002] As the core component of a vacuum switch, the vacuum interrupter's main functions include carrying, closing, and interrupting normal operating current and short-circuit fault current. Simultaneously, it must maintain good insulation capabilities when open to ensure the stable operation of the power system. The shielding cylinder, a key component of the vacuum interrupter, can condense arc-generating materials, absorb the energy released during arc generation, and adsorb metal vapor, thereby effectively improving the electric field distribution inside the vacuum interrupter and enhancing its arc-extinguishing effect.

[0003] Currently, in the process of fixing the shielding cylinder to the ceramic shell of the vacuum interrupter, there are two common methods: welding the inner platform of the ceramic shell and spinning the inner platform. The welding method involves machining a metallized layer on the inner platform of the ceramic shell to form a metallized inner platform, and then welding the shielding cylinder to the metallized inner platform to achieve welding fixation. The spinning method uses a step on the inner wall of the ceramic shell for fixing the shielding cylinder. One port of the shielding cylinder is mechanically spun, causing the spun port to be flanged and suspended and fixed to the inner platform of the ceramic shell. However, in practical applications, the welding method requires additional machining of a metallized layer on the inner platform of the ceramic shell, significantly increasing the manufacturing cost of the ceramic shell. Furthermore, the spinning method requires consideration of the matching between the force of the pressure equipment and the strength of the ceramic shell step, which can easily lead to step cracks and ceramic chipping, thus affecting the overall performance and reliability of the vacuum interrupter. Summary of the Invention

[0004] In view of the technical problems existing in the prior art, the present invention provides a shielding cylinder-ceramic shell assembly, its processing method and a vacuum interrupter, so as to solve the technical problems that the welding and fixing process of the existing shielding cylinder and the ceramic shell is prone to step cracks and ceramic chipping, and greatly increases the manufacturing cost of the ceramic shell.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: This invention provides a shielding cylinder-ceramic shell assembly, including a ceramic shell, a shielding cylinder, and a fixing ring; The inner wall of the ceramic shell is provided with an annular step; the upper end surface of the annular step is a horizontal plane, and the lower end surface of the annular step is an inclined plane. The shielding cylinder is disposed inside the ceramic shell; wherein, the outer wall of the shielding cylinder is provided with a cylinder inclined surface, and the cylinder inclined surface abuts against the lower end face of the annular step; The fixing ring is disposed on the upper end surface of the annular step and is positioned outside the upper port of the shielding cylinder; wherein, one end of the fixing ring is welded and fixed to the upper port of the shielding cylinder, and the other end of the fixing ring abuts against the upper end surface of the annular step.

[0006] Furthermore, the upper port of the shielding cylinder has a straight edge structure, and the inner side of the fixing ring is provided with a straight edge matching groove; wherein, the upper port of the shielding cylinder cooperates with the straight edge matching groove of the fixing ring.

[0007] Furthermore, when the shielding cylinder is welded and fixed to the fixing ring, the solder to be welded is placed in the straight edge matching groove of the fixing ring.

[0008] Furthermore, the upper end face of the fixing ring is configured with a rounded corner structure.

[0009] Furthermore, the upper port of the shielding cylinder has an inwardly narrowed structure, and the inner diameter of the fixing ring matches the outer diameter of the upper port of the shielding cylinder.

[0010] Furthermore, when the shielding cylinder is welded and fixed to the fixing ring, the solder to be welded is placed between the outer diameter of the upper port of the shielding cylinder and the upper end of the fixing ring.

[0011] Furthermore, the lower end face of the annular step has the same inclination angle as the inclined surface of the cylinder.

[0012] The present invention also provides a method for processing a shielding cylinder-ceramic shell assembly, comprising: The shielding cylinder and the ceramic shell are placed sequentially on the pre-processed positioning mold; wherein the ceramic shell, the shielding cylinder and the pre-processed positioning mold are all coaxially arranged, and the inclined surface of the cylinder abuts against the lower end face of the annular step; Place the fixing ring on the upper surface of the annular step; One end of the fixing ring is welded and fixed to the shielding cylinder, and the other end of the fixing ring abuts against the upper surface of the annular step.

[0013] Furthermore, the pre-processed positioning module includes a first positioning segment, a second positioning segment, and an extension segment that are coaxially connected from top to bottom; The lower end of the shielding cylinder fits onto the outside of the first positioning section; The lower end of the ceramic shell fits and is sleeved on the outside of the second positioning section, and the extended section is located outside the lower end of the ceramic shell.

[0014] The present invention also provides a vacuum interrupter, including the aforementioned shielding cylinder-ceramic shell assembly.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The shielding cylinder-ceramic shell assembly provided by this invention achieves reliable fixation between the shielding cylinder and the ceramic shell by welding a fixing ring to the upper port of the shielding cylinder and abutting the lower end face of the annular step of the ceramic shell with the inclined surface of the shielding cylinder. This ensures the pressure resistance performance of the product and effectively reduces the manufacturing cost. Specifically, by welding one end of the fixing ring to the upper port of the shielding cylinder and abutting the other end of the fixing ring to the upper end face of the annular step, the fixing between the shielding cylinder and the ceramic shell can be achieved without metallizing the annular step of the ceramic shell, significantly reducing the manufacturing cost of the ceramic shell and the vacuum interrupter. Furthermore, the abutting connection between the fixing ring and the annular step eliminates the risk of step cracks and ceramic chipping caused by spinning the ceramic shell, thereby effectively improving the overall performance and reliability of the vacuum interrupter.

[0016] Furthermore, by setting the upper end face of the fixing ring as a rounded corner structure, the rounded corner structure on the fixing ring can replace the rolled arc structure at the upper port of the shielding cylinder. This can reduce the maximum electric field strength inside the vacuum interrupter, thereby optimizing the internal field strength of the vacuum interrupter and improving the insulation strength of the vacuum interrupter.

[0017] The shielding cylinder-ceramic shell processing method and vacuum interrupter provided by the present invention have all the advantages of the above-mentioned shielding cylinder-ceramic shell assembly; wherein, in the processing of the shielding cylinder-ceramic shell, the pre-processed positioning module is used to position the shielding cylinder and the ceramic shell, which effectively improves the coaxiality of the shielding cylinder and the ceramic shell. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the processing status of the shielding cylinder-ceramic shell assembly provided in Example 1; Figure 2 This is a schematic diagram of the processing status of the shielding cylinder-ceramic shell assembly provided in Example 2.

[0020] Among them, 1 is a ceramic shell, 2 is a shielding cylinder, 3 is a fixing ring, 4 is the solder to be welded, 5 is a positioning mold, 11 is an annular step, and 21 is a cylindrical inclined surface. Detailed Implementation

[0021] To make the technical problems, technical solutions, and beneficial effects solved by this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0022] This invention provides a shielding cylinder-ceramic shell assembly, including a ceramic shell 1, a shielding cylinder 2, and a fixing ring 3; the inner wall of the ceramic shell 1 is provided with an annular step 11; the upper end surface of the annular step 11 is a horizontal plane, and the lower end surface of the annular step 11 is an inclined plane; the shielding cylinder 2 is disposed inside the ceramic shell 1; wherein, the outer wall of the shielding cylinder 2 is provided with a cylindrical inclined surface 21, and the cylindrical inclined surface 21 abuts against the lower end surface of the annular step 11; the fixing ring 3 is disposed on the upper end surface of the annular step 11 and is positioned outside the upper port of the shielding cylinder 2; wherein, one end of the fixing ring 3 is welded and fixed to the upper port of the shielding cylinder 2, and the other end of the fixing ring 3 abuts against the upper end surface of the annular step 11.

[0023] In the above embodiments, by setting a specific structure of annular steps on the inner wall of the ceramic shell, combined with the inclined surface of the outer wall of the shielding cylinder and the fixing ring set on the upper end face of the annular steps, the shielding cylinder and the ceramic shell are fixed together. This solution does not require additional metallization layer processing on the inner platform of the ceramic shell, effectively reducing the manufacturing cost of the ceramic shell. At the same time, it can eliminate the hidden dangers of step cracks and ceramic falling off caused by spinning the ceramic shell, thereby effectively improving the overall performance and reliability of the vacuum interrupter.

[0024] The following detailed explanation of the shielding cylinder-ceramic shell assembly provided by the present invention uses some specific embodiments: Example 1 As attached Figure 1 As shown, this embodiment 1 provides a shielding cylinder-ceramic shell assembly, including a ceramic shell 1, a shielding cylinder 2, and a fixing ring 3; the shielding cylinder 2 is disposed inside the ceramic shell 1, and the fixing ring 3 is used for the fixed connection between the shielding cylinder 2 and the ceramic shell 1.

[0025] In this embodiment 1, the ceramic shell 1 is a cylindrical structure, and the inner wall of the ceramic shell 1 is provided with an annular step 11. The annular step 11 includes an upper end face, a lower end face, and a transition surface located between the upper end face and the lower end face. The upper end face of the annular step 11 is a horizontal surface, the lower end face of the annular step 11 is an inclined surface, and the transition surface of the annular step 11 is a vertical surface. The upper end face of the annular step 11 serves as the support surface and abutment surface of the fixing ring 3, and the lower end of the annular step 11 serves as the abutment surface of the inclined surface 21 of the shielding cylinder 2.

[0026] In this embodiment 1, the shielding cylinder 2 is a cylindrical structure, and the outer wall of the shielding cylinder 2 is provided with a cylindrical inclined surface 21. The cylindrical inclined surface 21 abuts against the lower end face of the annular step 11. The cylindrical inclined surface 21 is abutted against the lower end face of the annular step 11 to limit the upward displacement of the shielding cylinder 2 along the axial direction. Preferably, the lower end face of the annular step 11 and the cylindrical inclined surface 21 have the same inclination angle so that the lower end face of the annular step 11 and the cylindrical inclined surface 21 are in surface contact, thereby increasing the mating area.

[0027] In this embodiment 1, the fixing ring 3 is a metal ring structure; the fixing ring 3 is disposed on the upper end surface of the annular step 11 and on the outer side of the upper port of the shielding cylinder 2; wherein, one end of the fixing ring 3 is welded and fixed to the upper port of the shielding cylinder 2, and the other end of the fixing ring 3 abuts against the upper end surface of the annular step 11; preferably, the fixing ring 3 and the shielding cylinder 2 are brazed.

[0028] Specifically, the upper port of the shielding cylinder 2 has a straight edge structure, and the inner side of the fixing ring 3 is provided with a straight edge matching groove; the upper port of the shielding cylinder 2 cooperates with the straight edge matching groove of the fixing ring 3; wherein, the outer wall surface of the upper port of the shielding cylinder 2 contacts the bottom of the straight edge matching groove of the fixing ring 3; it should be noted that when the shielding cylinder 2 and the fixing ring 3 are welded and fixed, the solder 4 to be welded is placed in the straight edge matching groove of the fixing ring 3.

[0029] The lower end of the shielding cylinder 2 is provided with an inwardly rolled arc structure, and the upper end face of the fixing ring 3 is provided with a rounded corner structure. By providing a rounded corner structure for the upper end face of the fixing ring 3, the existing rolled arc structure at the upper end of the shielding cylinder can be replaced with the rounded corner structure, which can reduce the maximum electric field strength inside the vacuum interrupter, thereby optimizing the internal field strength of the vacuum interrupter and significantly improving the insulation strength of the vacuum interrupter.

[0030] It should be noted that one end of the fixing ring 3 is welded to the upper port of the shielding cylinder 2, and the other end of the fixing ring 3 is abutted against the upper end face of the annular step 11. Combined with the abutting of the lower end face of the annular step 11 by the inclined surface of the cylinder body 21, the fixing ring 3, the annular step 11 and the inclined surface of the cylinder body 21 are used to ensure that the ceramic shell 1 and the shielding cylinder 2 are fixedly assembled through the cooperation of the fixing ring 3, the annular step 11 and the inclined surface of the cylinder body 2. There is no need to set a metallization layer on the annular step 11 and there is no need to perform metallization welding between it and the ceramic shell 1. While reducing the manufacturing cost of the ceramic shell 1, it can ensure the reliable fixation of the shielding cylinder 2 and the ceramic shell 1, thereby ensuring the overall performance of the product. The abutting of the other end of the fixing ring 3 against the upper end face of the annular step 11 can limit the downward displacement of the shielding cylinder 2 along the axial direction. Preferably, the bottom outer end of the fixing ring 3 is provided with an abutting part, and the abutting part of the fixing ring 3 abuts against the upper end face of the annular step 11.

[0031] Processing procedure: The processing of the shielding cylinder-ceramic shell assembly described in Embodiment 1 includes: placing the shielding cylinder 2 and the ceramic shell 1 sequentially on the pre-processed positioning mold 5; wherein the ceramic shell 1, the shielding cylinder 2, and the pre-processed positioning mold 5 are all coaxially arranged, and the inclined surface 21 of the cylinder abuts against the lower end face of the annular step 11; placing the fixing ring 3 on the upper end face of the annular step 11; welding and fixing one end of the fixing ring 3 to the shielding cylinder 2, and abutting the other end of the fixing ring 3 against the upper end face of the annular step 11.

[0032] Specifically, the process is as follows: Step 1: First, coaxially install the shielding cylinder 2 onto the pre-processed positioning mold 5. Then, insert the ceramic shell 1 onto the outside of the shielding cylinder 2 and coaxially install it onto the pre-processed positioning mold 5. After the ceramic shell 1 is installed, the inclined surface 21 of the shielding cylinder 2 can abut against the lower end face of the annular step 11 of the ceramic shell 1.

[0033] It should be noted that the pre-processed positioning mold 5 is used to support the shielding cylinder 2 and the ceramic shell, and at the same time, it can position the inner diameter of the shielding cylinder 2 and the ceramic shell 1, ensuring the coaxial assembly of the ceramic shell 1 and the shielding cylinder 2, and avoiding the misalignment between the ceramic shell 1 and the shielding cylinder 2.

[0034] Specifically, the pre-processed positioning module 5 includes a first positioning section, a second positioning section, and an extension section coaxially connected from top to bottom; the lower port of the shielding cylinder 2 fits and is sleeved on the outside of the first positioning section; specifically, the first positioning section extends into the lower port of the shielding cylinder 2, and the outer diameter of the first positioning section matches the inner diameter of the lower port of the shielding cylinder 2; the lower port of the ceramic shell 1 fits and is sleeved on the outside of the second positioning section; specifically, the second positioning section extends into the lower port of the ceramic shell 1, and the outer diameter of the second positioning section is smaller than the inner diameter of the ceramic shell 1; preferably, the difference between the outer diameter of the second positioning section and the inner diameter of the ceramic shell 1 is less than 0.5mm, that is, the gap between the second positioning section and the ceramic shell 1 is less than 0.5mm, thereby ensuring that the coaxiality of the ceramic shell 1 and the shielding cylinder 2 is less than 0.5mm; the extension section is located outside the lower port of the ceramic shell 1 to fix the positioning module 5 and avoid displacement during processing.

[0035] Step 2: Place the fixing ring 3 on the upper surface of the annular step 11; wherein the fixing ring 3 and the shielding cylinder 2 are coaxially arranged, and the upper port of the shielding cylinder 2 is matched with the straight edge matching groove of the fixing ring 3.

[0036] Step 3: Place the solder 4 to be soldered in the straight edge matching groove of the fixing ring 3; then, perform vacuum welding; during the welding process, the solder 4 to be soldered spreads to fix one end of the fixing ring 3 to the shielding cylinder 2; at the same time, the other end of the fixing ring 3 abuts against the upper end face of the annular step 11, thereby realizing the fixed assembly of the shielding cylinder 2 and the ceramic shell 1.

[0037] In the shielding cylinder-ceramic shell assembly described in Embodiment 1, the upper end of the shielding cylinder 2 is matched with the straight edge matching groove of the fixing ring 3, the inclined surface of the shielding cylinder 2 abuts against the lower end face of the annular step 11 of the ceramic shell 1, and the bottom end of the fixing ring 3 abuts against the upper end face of the annular step 11 of the ceramic shell 1. The shielding cylinder 2 and the fixing ring 3 are welded together to fix them, thus completing the fixed assembly of the shielding cylinder 2 and the ceramic shell 1. In addition, during the assembly and processing of the assembly, the positioning mold 5 is used to position the ceramic shell 1 and the shielding cylinder 2, which can ensure that the ceramic shell 1 and the shielding cylinder 2 are coaxially assembled and the coaxiality can be controlled within 0.5mm.

[0038] Example 2 As attached Figure 2 As shown, the shielding cylinder-ceramic shell assembly provided in this embodiment 2 is basically the same in structure and principle as the shielding cylinder-ceramic shell assembly described in embodiment 1 above; the differences are as follows: The upper port of the shielding cylinder 2 is a constricted structure, that is, the upper port of the shielding cylinder 2 is constricted towards the center of the shielding cylinder 2; by setting the upper port of the shielding cylinder 2 as a constricted structure, the maximum electric field strength inside the vacuum interrupter can be reduced, thereby optimizing the internal field strength of the vacuum interrupter and improving the insulation strength of the vacuum interrupter.

[0039] The inner diameter of the fixing ring 3 matches the outer diameter of the upper port of the shielding cylinder 2; wherein, the upper end of one side of the fixing ring 3 is welded and fixed to the outer wall of the upper port of the shielding cylinder 2, and the lower end of the other side of the fixing ring 3 abuts against the upper end surface of the annular step 11 of the ceramic shell 1.

[0040] Processing procedure: The processing procedure for the shielding cylinder-ceramic shell assembly described in Example 2 is as follows: Step 1: First, coaxially install the shielding cylinder 2 onto the pre-processed positioning mold 5. Then, insert the ceramic shell 1 onto the outside of the shielding cylinder 2 and coaxially install it onto the pre-processed positioning mold 5. After the ceramic shell 1 is installed, the inclined surface 21 of the shielding cylinder 2 can abut against the lower end face of the annular step 11 of the ceramic shell 1.

[0041] It should be noted that the pre-processed positioning mold 5 is used to support the shielding cylinder 2 and the ceramic shell, and at the same time, it can position the inner diameter of the shielding cylinder 2 and the ceramic shell 1, ensuring the coaxial assembly of the ceramic shell 1 and the shielding cylinder 2, and avoiding the misalignment between the ceramic shell 1 and the shielding cylinder 2.

[0042] Specifically, the pre-processed positioning module 5 includes a first positioning section, a second positioning section, and an extension section coaxially connected from top to bottom; the lower port of the shielding cylinder 2 fits and is sleeved on the outside of the first positioning section; specifically, the first positioning section extends into the lower port of the shielding cylinder 2, and the outer diameter of the first positioning section matches the inner diameter of the lower port of the shielding cylinder 2; the lower port of the ceramic shell 1 fits and is sleeved on the outside of the second positioning section; specifically, the second positioning section extends into the lower port of the ceramic shell 1, and the outer diameter of the second positioning section is smaller than the inner diameter of the ceramic shell 1; preferably, the difference between the outer diameter of the second positioning section and the inner diameter of the ceramic shell 1 is less than 0.5mm, that is, the gap between the second positioning section and the ceramic shell 1 is less than 0.5mm, thereby ensuring that the coaxiality of the ceramic shell 1 and the shielding cylinder 2 is less than 0.5mm; the extension section is located outside the lower port of the ceramic shell 1 to fix the positioning module 5 and avoid displacement during processing.

[0043] Step 2: Place the fixing ring 3 on the upper surface of the annular step 11; wherein the fixing ring 3 and the shielding cylinder 2 are coaxially arranged, and the upper port of the shielding cylinder 2 is matched with the straight edge matching groove of the fixing ring 3.

[0044] Step 3: Place the solder 4 to be soldered between the outer diameter of the upper port of the shielding cylinder 2 and the upper end of the fixing ring 3; then, perform vacuum welding; during the welding process, the solder 4 to be soldered spreads to fix one end of the fixing ring 3 to the shielding cylinder 2; at the same time, the other end of the fixing ring 3 abuts against the upper end face of the annular step 11, thereby realizing the fixed assembly of the shielding cylinder 2 and the ceramic shell 1.

[0045] In the shielding cylinder-ceramic shell assembly described in Embodiment 2, the inner diameter of the fixing ring 3 matches the outer diameter of the upper port of the shielding cylinder 2. The inclined surface of the shielding cylinder 2 abuts against the lower end face of the annular step 11 of the ceramic shell 1, and the bottom end of the fixing ring 3 abuts against the upper end face of the annular step 11 of the ceramic shell 1. The shielding cylinder 2 and the fixing ring 3 are welded together to fix them, thus completing the fixed assembly of the shielding cylinder 2 and the ceramic shell 1. In addition, during the assembly and processing of the assembly, the positioning mold 5 is used to position the ceramic shell 1 and the shielding cylinder 2, which can ensure that the ceramic shell 1 and the shielding cylinder 2 are coaxially assembled and that the coaxiality is controlled within 0.5mm.

[0046] Example 3 This embodiment 3 also provides a vacuum interrupter, including a shell assembly, a moving contact, and a stationary contact; the shell assembly adopts the shielding cylinder-ceramic shell assembly described in embodiment 1 or 2 above, and the moving contact and the stationary contact are both disposed inside the shielding cylinder of the shielding cylinder-ceramic shell assembly; it should be noted that the installation position and assembly relationship of the moving contact and the stationary contact inside the shielding cylinder are basically the same as those in the existing vacuum interrupter, and will not be described again here.

[0047] The shielding cylinder-ceramic shell assembly of this invention achieves reliable fixation of the shielding cylinder and the ceramic shell by welding the fixing ring to the upper port of the shielding cylinder and combining the abutment of the inclined surface of the shielding cylinder with the lower end face of the annular step of the ceramic shell. No metallization layer needs to be processed on the annular step of the ceramic shell, significantly reducing the manufacturing cost of the ceramic shell. Secondly, during assembly, positioning molds are used for positioning, effectively improving the coaxiality of the shielding cylinder and the ceramic shell. Furthermore, setting the upper end face of the fixing ring as a rounded corner structure, replacing the rolled arc structure of the upper port of the shielding cylinder with the rounded corner structure on the fixing ring, or setting the upper port of the shielding cylinder as an inwardly narrowed opening, can uniformly distribute the electric field in the vacuum interrupter and reduce the maximum electric field intensity inside the vacuum interrupter.

[0048] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A shielding cylinder-ceramic shell assembly, characterized in that, It includes a ceramic shell (1), a shielding cylinder (2), and a fixing ring (3); The inner wall of the ceramic shell (1) is provided with an annular step (11); the upper end surface of the annular step (11) is a horizontal surface, and the lower end surface of the annular step (11) is an inclined surface. The shielding cylinder (2) is disposed inside the ceramic shell (1); wherein, the outer wall of the shielding cylinder (2) is provided with a cylinder inclined surface (21), and the cylinder inclined surface (21) abuts against the lower end face of the annular step (11); The fixing ring (3) is disposed on the upper end surface of the annular step (11) and placed outside the upper port of the shielding cylinder (2); wherein, one end of the fixing ring (3) is welded and fixed to the upper port of the shielding cylinder (2), and the other end of the fixing ring (3) abuts against the upper end surface of the annular step (11).

2. The shielding cylinder-ceramic shell assembly according to claim 1, characterized in that, The upper port of the shielding cylinder (2) has a straight edge structure, and the inner side of the fixing ring (3) is provided with a straight edge matching groove; wherein, the upper port of the shielding cylinder (2) is engaged with the straight edge matching groove of the fixing ring (3).

3. The shielding cylinder-ceramic shell assembly according to claim 2, characterized in that, When the shielding cylinder (2) is welded and fixed to the fixing ring (3), the solder to be welded (4) is placed in the straight edge matching groove of the fixing ring (3).

4. The shielding cylinder-ceramic shell assembly according to claim 2, characterized in that, The upper end face of the fixing ring (3) is set with a rounded corner structure.

5. A shielding cylinder-ceramic shell assembly according to claim 1, characterized in that, The upper port of the shielding cylinder (2) has an inwardly narrowed structure, and the inner diameter of the fixing ring (3) matches the outer diameter of the upper port of the shielding cylinder (2).

6. A shielding cylinder-ceramic shell assembly according to claim 5, characterized in that, When the shielding cylinder (2) is welded and fixed to the fixing ring (3), the solder to be welded (4) is placed between the outer diameter of the upper port of the shielding cylinder (2) and the upper end of the fixing ring (3).

7. A shielding cylinder-ceramic shell assembly according to claim 1, characterized in that, The lower end face of the annular step (11) has the same inclination angle as the inclined surface (21) of the cylinder.

8. A method for processing a shielding cylinder-ceramic shell assembly as described in any one of claims 1-7, characterized in that, include: The shielding cylinder (2) and the ceramic shell (1) are placed sequentially on the pre-processed positioning mold (5); wherein the ceramic shell (1), the shielding cylinder (2) and the pre-processed positioning mold (5) are all coaxially arranged, and the inclined surface (21) of the cylinder abuts against the lower end face of the annular step (11). Place the fixing ring (3) on the upper surface of the annular step (11); One end of the fixing ring (3) is welded and fixed to the shielding cylinder (2), and the other end of the fixing ring (3) abuts against the upper surface of the annular step (11).

9. A method for processing a shielding cylinder-ceramic shell assembly according to claim 8, characterized in that, The pre-processed positioning module (5) includes a first positioning section, a second positioning section and an extension section connected coaxially from top to bottom; The lower end of the shielding cylinder (2) is fitted onto the outside of the first positioning section; The lower end of the ceramic shell (1) is fitted onto the outside of the second positioning section, and the extended section is located outside the lower end of the ceramic shell (1).

10. A vacuum interrupter, characterized in that, Includes a shielding cylinder-ceramic shell assembly as described in any one of claims 1-7.

Images