Coaxiality control method for vacuum arc-extinguishing chamber and vacuum arc-extinguishing chamber

Abstract

The invention belongs to the technical field of vacuum arc extinguish chambers, and discloses a vacuum arc extinguish chamber coaxiality control method and a vacuum arc extinguish chamber, alignment wire grooves are respectively and accurately marked on a movable conducting rod, a movable cover plate, a movable electrode, a static electrode and a static cover plate, a movable tube core and a static tube core are assembled step by step, and respective internal coaxiality is controlled; and aligning the static tube core with a pre-marked mold alignment line slot, and calibrating the coaxiality between the moving end and the static end key line slot by using laser after integral assembly, thereby realizing high-precision alignment of the moving contact and the static contact. By adopting the method, the tedious operation of a traditional alignment mold is remarkably simplified, the production time is shortened, meanwhile, the coaxiality control precision is greatly improved, the strict requirements of the vacuum arc-extinguishing chamber for high-voltage adaptability, long-period stability and operation reliability are effectively met, the bottleneck of insufficient precision in the prior art is solved, and the production efficiency is improved. And a technical guarantee is provided for batch production of high-performance products.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of vacuum arc-extinguishing chambers, and particularly relates to the field of high-voltage gas-insulated metal-enclosed switchgear, and more particularly to a vacuum arc-extinguishing chamber coaxiality control method and a vacuum arc-extinguishing chamber. BACKGROUND

[0002] In the field of power system equipment, vacuum circuit breakers have become core power equipment in power grid construction and upgrading due to their environmental protection and green characteristics such as oil-free, gas-free pollution, and convenient operation and maintenance, and the application range continues to expand. As the core component of vacuum circuit breakers for realizing circuit on-off and arc extinguishing, the iteration and upgrading of the technical performance of vacuum arc-extinguishing chambers directly promote the development of vacuum circuit breakers to higher voltage levels and better operating stability. In recent years, environmental protection regulations have become increasingly stringent worldwide, and the green requirements for power equipment are continuously improving, which further promotes the extension of vacuum arc-extinguishing chambers from traditional medium and low voltage fields to high voltage and super high voltage fields, and the market demand and technology development space are synchronously expanded.

[0003] With the continuous rise of the requirements of the power system on the reliability, service life and voltage level of the vacuum switch equipment, the high voltage adaptability, long period stability and operating reliability of the vacuum arc-extinguishing chamber become core technical indicators, which puts forward very high requirements on the control of its shape and position tolerance, especially the coaxiality. In the current sealing and assembling process of the vacuum arc-extinguishing chamber, the dynamic and static end alignment is a key link, but due to the lack of stable corresponding relationship between the dynamic and static ends in the assembly process, the industry generally adopts an auxiliary positioning method by using an alignment mold. This method not only has a complicated operation process and occupies a large number of production man-hours, but more importantly, the problem of low alignment accuracy makes it difficult to meet the stringent standards of circuit breaker manufacturers on the installation accuracy. As the core shape and position tolerance parameter that determines the arc-extinguishing performance, insulation performance and service life of the vacuum arc-extinguishing chamber, the deficiency of the existing control method directly restricts the batch production of high-performance vacuum arc-extinguishing chambers.

[0004] Therefore, the existing dynamic and static end alignment method in the assembly process of the vacuum arc-extinguishing chamber has the problems of complicated operation and insufficient accuracy, and cannot meet the control requirements of the coaxiality of the high-performance vacuum arc-extinguishing chamber. SUMMARY

[0005] The present application provides a vacuum arc-extinguishing chamber coaxiality control method, which can effectively solve the problems of complicated operation and insufficient accuracy of the existing dynamic and static end alignment method in the assembly process of the vacuum arc-extinguishing chamber, and can meet the control requirements of the coaxiality of the high-performance vacuum arc-extinguishing chamber.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical content: A vacuum arc-extinguishing chamber coaxiality control method, comprising: aligning along the axis direction of the dynamic conducting rod to obtain a first alignment slot; Marking along the axial direction of the moving cover plate to obtain a second alignment slot; Marking along the axial direction of the moving electrode to obtain a third alignment slot; Marking along the axial direction of the static electrode to obtain a fourth alignment slot; Marking along the axial direction of the static cover plate to obtain a fifth alignment slot; According to the first, second and third alignment slots, the moving tube core is assembled and aligned, and the coaxiality between every two alignment slots of the moving end is controlled to meet the preset moving end tolerance requirement, so as to obtain the moving tube core. According to the fourth and fifth alignment slots, the static tube core is assembled and aligned, and the coaxiality between the two alignment slots of the static end is controlled to meet the preset static end tolerance requirement, so as to obtain the static tube core. The static tube core is placed in the sealing row base mold pre-marked with the mold alignment slot, and the threaded hole alignment mark of the static cover plate is aligned with the mold alignment slot. The moving tube core, the sealing row base mold assembled with the static tube core and the porcelain shell are assembled, and alignment is performed according to the first, second and fifth alignment slots. The coaxiality between the first, second and fifth alignment slots is calibrated by using a laser calibration method, so that the coaxiality meets the preset requirement of the moving and static contact coaxiality.

[0007] Further, when marking along the axial direction of the moving conductive rod, the moving cover plate, the moving electrode, the static electrode and the static cover plate, a laser marking method is used to form corresponding alignment slots; wherein the width of each alignment slot is 0.1-0.3mm, and the depth is 0.05-0.15mm, and the extension direction of the alignment slot is completely parallel to the axis of the corresponding component.

[0008] Further, in the control of the coaxiality between every two alignment slots of the moving end to meet the preset moving end tolerance requirement, the coaxiality between every two alignment slots of the moving end is controlled to be ≤0.10mm.

[0009] Further, in the control of the coaxiality between the two alignment slots of the static end to meet the preset static end tolerance requirement, the coaxiality between the two alignment slots of the static end is controlled to be ≤0.10mm.

[0010] Further, the laser calibration method is used to calibrate the coaxiality between the first, second and fifth alignment slots, which includes: The laser level is fixed to the end of the porcelain shell, and the laser beam passes through the fifth, second and first alignment slots in turn, and when the center coincidence error of the three laser reflection spots is ≤0.1mm, it is determined that the coaxiality meets the requirement.

[0011] Further, laser receiving targets are arranged at the second and fifth alignment line grooves respectively, and the coaxiality error is determined by the offset of the light spot on the receiving target, and if the offset exceeds the preset threshold, the position of the corresponding component is adjusted.

[0012] Further, during the use of the laser level, if the furnace frame flatness is less than or equal to 0.1mm / m, the 1V1H mode is adopted, and if the furnace frame flatness is greater than 0.1mm / m, the inclined line mode is adopted to correct the inclination angle.

[0013] Further, in the alignment of the threaded hole alignment mark of the static cover plate and the mold alignment line groove, a dial gauge is used to assist in detecting the deviation of the center of the threaded hole and the axis of the mold alignment line groove, so that the deviation value is less than 0.01mm.

[0014] Further, the first alignment line groove, the second alignment line groove, the third alignment line groove, the fourth alignment line groove and the fifth alignment line groove are all axially extending V-shaped grooves, and the groove opening angle of each alignment line groove is 60°-90°, and the surface of the alignment line groove is quenched, and the quenching hardness reaches HRC50-HRC55.

[0015] A vacuum arc-extinguishing chamber is assembled by using the coaxiality control method of the vacuum arc-extinguishing chamber.

[0016] Compared with the prior art, the present application has the following beneficial effects: The present application provides a coaxiality control method of a vacuum arc-extinguishing chamber, which precisely marks alignment line grooves on a moving conducting rod, a moving cover plate, a moving electrode, a static electrode and a static cover plate respectively, and assembles a moving tube core and a static tube core step by step to control the coaxiality of each internal part; then the static tube core is aligned with the pre-marked mold alignment line groove, and after overall assembly, the coaxiality between the key line grooves of the moving end and the static end is calibrated by laser to realize high-precision alignment of the moving and static contacts. This method uses the alignment line groove as a stable geometric reference, controls the internal tolerance of the moving end and static end components step by step, and reduces the cumulative error; laser calibration verifies and adjusts the coaxial relationship between multiple line grooves in real time to ensure the consistency of the moving and static end corresponding relationship during assembly. This method significantly simplifies the cumbersome operation of the traditional alignment mold, shortens the production time, and significantly improves the coaxiality control precision, effectively meets the stringent requirements of the vacuum arc-extinguishing chamber for high-voltage adaptability, long-period stability and operation reliability, solves the precision bottleneck of the prior art, and provides technical support for batch production of high-performance products.

[0017] Preferably, in this invention, laser marking is used to form alignment grooves of specific dimensions and orientations. Laser marking ensures that the geometric features of the grooves are highly accurate and completely parallel to the component axis, providing a reliable reference for assembly. This eliminates human marking errors, improves the consistency and repeatability of the grooves, thereby enhancing the stability of the entire assembly process and laying the foundation for high-precision coaxiality control.

[0018] Preferably, in this invention, for the moving end assembly, the coaxiality between every two alignment slots must meet strict tolerances. By prioritizing the constraint of the internal form and position relationships of the moving end during step-by-step assembly, error propagation is avoided. This ensures the overall geometric accuracy of the moving core, optimizes arc-extinguishing performance, reduces the burden of subsequent calibration, and directly improves the assembly efficiency and product consistency of the vacuum interrupter.

[0019] Preferably, in this invention, for the stationary end assembly, the coaxiality between the two alignment slots must meet strict tolerances. Independent optimization of the internal alignment of the stationary end reduces deviations at the assembly level to support overall assembly accuracy. This ensures the stability and insulation performance of the stationary core, thereby enhancing the operational reliability of the vacuum interrupter under high-voltage environments.

[0020] Preferably, in this invention, a laser level is used to calibrate the coaxiality of key cable slots by measuring the overlap of the laser spot. Coaxial deviation is determined by the overlap of the reflected laser spot as the laser beam passes through the cable slot, enabling non-contact, real-time adjustment. This provides high-sensitivity detection, ensuring accurate alignment of the moving and stationary contacts, and significantly improving the breaking performance and mechanical life of the arc-extinguishing chamber.

[0021] Preferably, in this invention, a laser receiving target is added at a specific groove, and the error is determined by the laser spot offset. The receiving target quantifies the offset data, facilitating intuitive detection and fine-tuning of component positions. This enhances the accuracy and operability of the calibration process, reduces human intervention errors, and improves assembly efficiency and final product qualification rate.

[0022] Preferably, in this invention, the laser level mode, such as horizontal or oblique mode, is selected based on the flatness of the furnace frame. The principle is to dynamically adapt to the unevenness of the working environment and eliminate external interference through angle correction. This ensures the reliability of calibration under various working conditions, avoids assembly errors caused by planar deviations, and guarantees stability in mass production.

[0023] Preferably, in this invention, a dial indicator is used to assist in detecting the axial deviation between the center of the threaded hole and the mold groove. The dial indicator provides high-resolution micro-measurement, accurately aligning the initial assembly point. This eliminates minute gaps, ensures the initial accuracy of the stationary core positioning, thereby reducing the cumulative error of the overall assembly and improving the product's sealing performance and durability.

[0024] Preferably, in this invention, the alignment groove is designed as a V-groove at a specific angle and then hardened. The V-groove structure facilitates laser beam alignment and component alignment, while hardening enhances surface hardness and wear resistance. This extends the service life of the groove, maintains the stability of the long-term assembly reference, and thus supports the consistency of form and position tolerances of the vacuum interrupter during frequent operation.

[0025] This invention also provides a vacuum interrupter, assembled using the aforementioned coaxiality control method. This vacuum interrupter employs a high-precision assembly method to ensure strictly controllable coaxiality between the moving conductive rod, moving cover plate, and stationary end assembly, allowing the bellows to maintain ideal coaxiality with the moving conductive rod under pre-compression. The design of a tight fit between the bellows end face and the moving cover plate effectively eliminates the risk of eccentricity caused by assembly gaps, ensuring that the bellows' expansion and contraction movements are entirely along the axis of the moving conductive rod. This structure significantly reduces fatigue damage to the bellows caused by skewed forces, greatly improves the mechanical reliability and sealing stability of the vacuum interrupter during frequent opening and closing, directly enhances the product's long-cycle service life and insulation performance, solves the problem of early bellows failure due to coaxiality deviation in traditional assembly methods, and achieves reliable operation of high-voltage vacuum interrupters, fully demonstrating the value extension of the method patent to the core performance of the product. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the moving end assembly using a vacuum interrupter coaxiality control method provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the stationary end assembly using a vacuum interrupter coaxiality control method provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the overall assembly of the vacuum interrupter provided in an embodiment of the present invention.

[0027] Figure label: 1. Moving conductive rod; 2. Moving cover plate; 3. Moving electrode; 4. Static electrode; 5. Static cover plate; 6. Static conductive rod; 7. Bellows; 8. Ceramic shell; 9. Sealing base mold; 10. Mold alignment groove; 11. First alignment groove; 12. Second alignment groove; 13. Third alignment groove; 14. Fourth alignment groove; 15. Fifth alignment groove. Detailed Implementation

[0028] To make the technical problems solved by the present invention, the technical solutions, and the beneficial effects clearer, the following specific embodiments provide a further detailed description of the present invention. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] This embodiment provides a method for controlling the coaxiality of a vacuum interrupter, including: Marking is performed along the axis of the moving conductive rod 1 to obtain the first alignment groove 11; Mark along the axial direction of the movable cover plate 2 to obtain the second alignment groove 12; Marking is performed along the axial direction of the moving electrode 3 to obtain the third alignment groove 13; Marking is performed along the axial direction of the static electrode 4 to obtain the fourth alignment groove 14; Mark along the axial direction of the static cover plate 5 to obtain the fifth alignment groove 15; According to the first alignment groove 11, the second alignment groove 12 and the third alignment groove 13, the moving core is assembled and aligned, and the coaxiality between every two alignment grooves of the moving end is controlled to meet the preset moving end tolerance requirements in order to obtain the moving core. According to the fourth alignment groove 14 and the fifth alignment groove 15, the stationary core is assembled and aligned, and the coaxiality between the two alignment grooves at the stationary end is controlled to meet the preset stationary end tolerance requirements in order to obtain the stationary core. Place the stationary core tube into the sealing base mold 9, which is pre-marked with the mold alignment groove 10, and align the threaded hole alignment mark of the stationary cover plate 5 with the mold alignment groove 10. The moving core, the sealing base mold 9 with the stationary core assembled, and the ceramic shell 8 are assembled and aligned according to the first alignment groove 11, the second alignment groove 12 and the fifth alignment groove 15. The coaxiality between each pair of the first alignment groove 11, the second alignment groove 12 and the fifth alignment groove 15 is calibrated using laser calibration so that the coaxiality meets the preset requirements for the coaxiality of the moving and stationary contacts.

[0033] The coaxiality control method for the vacuum interrupter provided in this embodiment will be further explained below with reference to the accompanying drawings: This embodiment provides a method for controlling the coaxiality of a vacuum interrupter, the specific steps of which are as follows: Step 1: Marking and machining the axial alignment grooves on each component: Select movable conductive rod 1, movable cover plate 2, movable electrode 3, stationary electrode 4, and stationary cover plate 5 that meet the dimensional requirements. Use a YLP-20 fiber laser marking machine to mark each component along the axial direction, forming corresponding alignment grooves. The processing parameters and results for each component are as follows: Moving conductive rod 1: A first alignment groove 11 is machined on the outer circular surface of one end near the moving electrode 3. The groove has a V-shaped structure, a groove opening angle of 75°, a width of 0.2 mm, and a depth of 0.1 mm. After machining, the groove surface is subjected to induction hardening treatment, and the hardening hardness reaches HRC52. Moving cover plate 2: A second alignment groove 12 is machined on the inner wall of the section that mates with the moving conductive rod 1. The groove parameters are completely consistent with the first alignment groove 11, and the extension direction of the groove is strictly parallel to the axis of the moving cover plate 2, with a parallelism error ≤0.02mm. Moving electrode 3: A third alignment groove 13 is machined on the end face where the moving electrode 3 connects to the moving conductive rod 1. The groove type and size are the same as before. During machining, the center of the arc surface of the moving electrode 3 is used as the reference for positioning. Static electrode 4: A fourth alignment groove 14 is machined on the outer circle of the end that is connected to the static conductive rod 6. The parameters are the same as those of the first alignment groove 11. The positioning reference is the contact center of the static electrode 4. Stationary cover plate 5: A fifth alignment groove 15 is machined on its outer wall near the mating surface of the ceramic shell 8. At the same time, a thread hole alignment mark is marked on the end face of the thread hole of the stationary cover plate 5. The groove parameters are the same as those mentioned above. The axial deviation between the thread hole alignment mark and the fifth alignment groove 15 is ≤0.01mm.

[0034] After all alignment grooves are machined, a tool microscope is used to check the dimensional accuracy and axis parallelism of the grooves to ensure that they meet the above parameter requirements.

[0035] Step 2: Assembly and coaxiality control of the moving core: like Figure 1 As shown, the movable conductive rod 1, movable cover plate 2, and movable electrode 3 are placed on the HT-100 CNC assembly worktable, with the center of the arc surface of the movable electrode 3 as the positioning reference: First, fix the moving electrode 3 on the three-jaw chuck of the assembly table, and use a dial indicator to correct the radial runout of the moving electrode 3 to ≤0.01mm; Next, connect the moving conductive rod 1 and the moving electrode 3 by thread. Rotate the moving conductive rod 1 to align the first alignment groove 11 and the third alignment groove 13. Use a laser alignment instrument to detect the coaxiality of the two grooves and adjust it to ≤0.08mm. Then, the movable cover plate 2 is fitted onto the outside of the movable conductive rod 1, so that the second alignment groove 12 is simultaneously aligned with the first alignment groove 11 and the third alignment groove 13. The coaxiality of the second alignment groove 12 with the first alignment groove 11 and the second alignment groove 12 with the third alignment groove 13 is measured with an inner diameter dial indicator to ensure that it is ≤0.10mm. Finally, the moving electrode 3 is fixed to the moving conductive rod 1, and the moving cover plate 2 is fixed to the moving conductive rod 1 to complete the assembly of the moving core. The overall radial runout of the assembled moving core is ≤0.10mm.

[0036] Step 3: Assembly and coaxiality control of the stationary core: like Figure 2 As shown, a stationary conductive rod 6 matching the moving core is selected, and the stationary electrode 4 is connected to the stationary conductive rod 6 by brazing, with the center of the contact of the stationary electrode 4 as the reference: Insert the static conductive rod 6, which is equipped with the static electrode 4, into the center hole of the static cover plate 5 so that the fourth alignment groove 14 and the fifth alignment groove 15 are initially aligned. The coaxiality of the fourth alignment groove 14 and the fifth alignment groove 15 was tested using a lever dial indicator. The coaxiality of the two grooves was then adjusted to ≤0.09mm by finely adjusting the position of the stationary cover plate 5. Tighten the static cover plate 5 and the static conductive rod 6 with nuts, and check the coaxiality of the two grooves again to confirm that the preset static end tolerance requirement of ≤0.10mm is met, thus completing the static tube core assembly.

[0037] Step 4: Alignment and assembly of the stationary core and sealing base mold 9: Select a sealing base mold 9 with pre-machined mold alignment groove 10. The coaxiality between the mold alignment groove 10 and the positioning axis of the sealing base mold 9 is ≤0.02mm. The specific steps are as follows: Fix the sealing base mold 9 on the assembly workbench and adjust the mold's levelness to ≤0.05mm / m using a level. Place the stationary core tube into the positioning groove of the sealing base mold 9, so that the threaded hole alignment mark of the stationary cover plate 5 is initially aligned with the mold alignment groove 10. Place the dial indicator probe against the inner wall of the threaded hole in the stationary cover plate 5, slowly rotate the stationary tube core, check the axis deviation between the center of the threaded hole and the alignment groove 10 of the mold, fine adjust the position of the stationary tube core until the deviation value is ≤0.008mm, and complete the fixing of the stationary tube core and the sealing base mold.

[0038] Step 5: Overall Assembly and Laser Calibration: like Figure 3As shown, select a ceramic shell 8 with an inner diameter that meets the requirements, and ensure that the flatness of its two end sealing surfaces is ≤0.02mm. Complete the overall assembly and calibration according to the following steps: The lower end of the ceramic shell 8 is sealed to the static cover plate 5 on the sealing base mold 9, and an O-ring is used for sealing pretreatment. The bellows 7 is fitted onto the outside of the moving conductive rod 1, so that one end of the bellows 7 is tightly attached to the inner end face of the moving cover plate 2, and the two are fixed by argon arc welding. Place the movable core equipped with the bellows 7 into the ceramic shell 8, and adjust the position of the movable core so that the first alignment groove 11 and the second alignment groove 12 are initially aligned with the fifth alignment groove 15 respectively. The flatness of the furnace frame is measured to be 0.08 mm / m (≤0.1 mm / m). The ZJ-300 laser level is fixed to the upper end of the ceramic shell 8. The laser beam is emitted in 1V1H mode so that the laser beam passes through the fifth alignment groove 15, the second alignment groove 12 and the first alignment groove 11 in sequence. High-precision laser receiving targets are set at the second alignment slot 12 and the fifth alignment slot 15 respectively. The laser reflection spots on the receiving targets are observed, and the radial position of the moving core is adjusted until the overlap error of the laser reflection spot center of the three slots is ≤0.08mm. The moving cover plate 2 is sealed to the upper end of the ceramic shell 8 and fastened with bolts to complete the overall assembly. After assembly, the coaxiality of the moving and stationary contacts is checked again to be ≤0.10mm.

[0039] This embodiment also provides a vacuum interrupter, which is assembled using the coaxiality control method provided in the embodiment. The vacuum interrupter is suitable for 12kV medium-voltage switchgear, and its structure includes: a moving conductive rod 1, a moving cover plate 2, a moving electrode 3, a stationary electrode 4, a stationary cover plate 5, a stationary conductive rod 6, a bellows 7, a porcelain shell 8, and matching insulating accessories.

[0040] After the vacuum interrupter was assembled, the following tests were conducted: the coaxiality of the moving and stationary contacts was 0.08 mm, and the vacuum degree was ≤1×10⁻⁶. - 4 The power frequency withstand voltage (1min) reaches 42kV, which meets the standard requirements of GB / T 1984-2014 "High Voltage AC Circuit Breakers".

[0041] For example, this embodiment also specifically implements the coaxiality control method for vacuum interrupters. The flatness of the furnace frame at the assembly site was measured to be 0.12 mm / m (>0.1 mm / m). Therefore, the tilt angle was corrected using a slant mode in the laser calibration step. The specific adjustment method is as follows: After fixing the laser level to the upper end of the ceramic shell 8, the tilt angle of the furnace frame is first detected as 0.06° using the instrument's built-in tilt sensor. This tilt angle parameter is then input into the control interface of the laser level, setting it to oblique line mode, so that the laser beam is emitted along the corrected tilt angle. At this time, the laser beam passes through the fifth alignment slot 15, the second alignment slot 12, and the first alignment slot 11 in sequence. The position of the light spot is observed through the receiving target. After fine-tuning the tube core, the overlap error of the center of the light spot in the three slots is 0.09mm, which meets the preset requirement of coaxiality of the moving and stationary contacts. The remaining steps are completely consistent with the embodiment, and the coaxiality of the finally assembled vacuum interrupter is ≤0.10mm, meeting the performance standards.

[0042] In summary, this invention provides a method for controlling the coaxiality of a vacuum interrupter and a vacuum interrupter itself, which has the following advantages compared to existing coaxiality control methods: This invention achieves initial positioning by precisely marking alignment grooves along the axial direction of multiple components, assembling them step-by-step, and controlling the coaxiality of the moving and stationary cores. Initial positioning is achieved through pre-calibrated grooves using a mold. Finally, real-time laser calibration of the coaxial relationship of key grooves is used, while simultaneously ensuring a tight fit between the bellows, moving conductive rod, and moving cover plate. Using high-precision grooves as a geometric reference chain, error propagation is reduced by constraining component tolerances in stages, while laser calibration ensures system-level alignment consistency between the moving and stationary ends. The tight-fitting design of the bellows eliminates the risk of dynamic offset. This method improves assembly accuracy to within 0.1mm; controls the coaxiality of the arc-extinguishing chamber to within φ1; improves the insulation performance of the arc-extinguishing chamber by more than 20%; and increases assembly efficiency by 30%. This method is highly versatile and reliable, significantly improving the performance and lifespan of vacuum arc-extinguishing chamber products. Furthermore, it effectively eliminates the complex operations of traditional alignment molds, enabling the vacuum arc-extinguishing chamber to achieve excellent arc-extinguishing performance, insulation strength, and mechanical stability, perfectly adapting to high voltage levels and long-cycle operation requirements, providing a reliable guarantee for the mass production of high-performance products.

[0043] 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 method for controlling the coaxiality of a vacuum interrupter, characterized in that, include: Mark along the axis of the moving conductive rod (1) to obtain the first alignment groove (11); Mark along the axial direction of the movable cover plate (2) to obtain the second alignment groove (12); Mark along the axial direction of the moving electrode (3) to obtain the third alignment groove (13); Mark along the axial direction of the static electrode (4) to obtain the fourth alignment groove (14). Mark along the axial direction of the static cover plate (5) to obtain the fifth alignment groove (15); According to the first alignment groove (11), the second alignment groove (12) and the third alignment groove (13), the moving core is assembled and aligned, and the coaxiality between every two alignment grooves of the moving end is controlled to meet the preset moving end tolerance requirements in order to obtain the moving core; According to the fourth alignment groove (14) and the fifth alignment groove (15), the stationary core is assembled and aligned, and the coaxiality between the two alignment grooves at the stationary end is controlled to meet the preset stationary end tolerance requirements in order to obtain the stationary core. Place the stationary core into the sealing base mold (9) with the pre-marked mold alignment groove (10), and align the threaded hole alignment mark of the stationary cover plate (5) with the mold alignment groove (10); The moving core, the sealing base mold (9) with the stationary core assembled, and the ceramic shell (8) are assembled and aligned according to the first alignment groove (11), the second alignment groove (12) and the fifth alignment groove (15); The coaxiality between the first alignment groove (11), the second alignment groove (12) and the fifth alignment groove (15) is calibrated using laser calibration so that the coaxiality meets the preset requirements of the coaxiality of the moving and stationary contacts.

2. The method for controlling the coaxiality of a vacuum interrupter according to claim 1, characterized in that, When marking along the axial direction of the moving conductive rod (1), moving cover plate (2), moving electrode (3), stationary electrode (4) and stationary cover plate (5), the corresponding alignment grooves are formed by laser marking. The width of each alignment groove is 0.1mm-0.3mm and the depth is 0.05mm-0.15mm. The extension direction of the alignment groove is completely parallel to the axis of the corresponding component.

3. The method for controlling the coaxiality of a vacuum interrupter according to claim 1, characterized in that, The coaxiality between every two alignment slots of the control moving end meets the preset moving end tolerance requirement, wherein the coaxiality between every two alignment slots of the control moving end is ≤0.10mm.

4. The method for controlling the coaxiality of a vacuum interrupter according to claim 1, characterized in that, The coaxiality between the two alignment grooves of the control stationary end meets the preset stationary end tolerance requirements, wherein the coaxiality between the two alignment grooves of the control stationary end is ≤0.10mm.

5. The method for controlling the coaxiality of a vacuum interrupter according to claim 1, characterized in that, The method of calibrating the coaxiality between each pair of the first alignment groove (11), the second alignment groove (12), and the fifth alignment groove (15) using laser calibration includes: Fix the laser level to the end of the ceramic shell (8), and let the laser beam pass through the fifth alignment groove (15), the second alignment groove (12) and the first alignment groove (11) in sequence. When the error of the center coincidence of the laser reflection spot of the three is ≤0.1mm, the coaxiality is judged to meet the standard.

6. The method for controlling the coaxiality of a vacuum interrupter according to claim 5, characterized in that, Laser receiving targets are set at the second alignment slot (12) and the fifth alignment slot (15) respectively. The coaxiality error is judged by the offset of the light spot on the receiving target. If the offset exceeds the preset threshold, the position of the corresponding component is adjusted.

7. The method for controlling the coaxiality of a vacuum interrupter according to claim 5, characterized in that, When using a laser level, if the flatness of the furnace frame is ≤0.1mm / m, use the 1V1H mode; if the flatness of the furnace frame is >0.1mm / m, use the slant mode to correct the tilt angle.

8. The method for controlling the coaxiality of a vacuum interrupter according to claim 1, characterized in that, In the process of aligning the threaded hole alignment mark of the static cover plate (5) with the mold alignment groove (10), a dial indicator is used to assist in the detection of the deviation between the center of the threaded hole and the axis of the mold alignment groove (10), so that the deviation value is less than 0.01mm.

9. The method for controlling the coaxiality of a vacuum interrupter according to claim 1, characterized in that, The first alignment groove (11), the second alignment groove (12), the third alignment groove (13), the fourth alignment groove (14) and the fifth alignment groove (15) are all axially extending V-shaped grooves, and the groove opening angle of each alignment groove is 60°~90°. The surface of the alignment groove is quenched and the quenching hardness reaches HRC50-HRC55.

10. A vacuum interrupter, characterized in that, The vacuum interrupter is assembled using the coaxiality control method of any one of claims 1-9. The vacuum interrupter includes a bellows (7). The bellows (7) is sleeved on the moving conductive rod (1), and its end face is tightly attached to the inner end face of the moving cover plate (2).

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