Anti-fatigue vacuum arc-extinguishing chamber structure and use method thereof
By installing a raised structure on the end surface of the end cap of the vacuum arc extinguishing chamber to disperse stress, the problem of loss of sealing and insulation functions caused by stress accumulation and fatigue effects of the end cap is solved, and the fatigue resistance and service life are significantly improved.
Patent Information
- Application Number
- CN202411695658.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-02-28
AI Technical Summary
At high voltage and high current levels, the end caps are prone to cracks due to stress accumulation and fatigue effects, resulting in loss of sealing and insulation functions.
By providing a raised structure on the end surfaces of the first end cover and the second end cover, mechanical stress and thermal stress are dispersed, and a plurality of stress relief points are formed to reduce stress concentration.
It significantly improves the fatigue resistance of the end cap of the vacuum arc extinguishing chamber, extends the mechanical service life of the equipment, and maintains the insulation and sealing performance.
Smart Images
Figure CN119542071A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of vacuum interrupter chambers, and in particular to a fatigue-resistant vacuum interrupter chamber structure and a use method thereof. Background Art
[0002] With the continuous development of power systems, the demand for high-voltage switchgear is growing. Especially driven by environmental protection requirements, vacuum interrupters have taken a dominant position in the medium voltage field due to their good insulation and breaking performance, excellent environmental performance, and simple maintenance, and are gradually developing towards higher voltage levels. The end cover structure plays the role of sealing, mechanical support, and protection in the vacuum interrupter, and its two ends are connected to the conductive rod, porcelain shell and other structures.
[0003] As the voltage and current levels continue to increase, the overall mass of the arc extinguishing chamber also continues to increase, which will cause the stress on the end cover to increase in the case of hoisting. The increase in current level will also increase the mass of the moving contact, and the moving mass of the arc extinguishing chamber will also continue to increase, so that the impact force of the moving contact on the arc extinguishing chamber will continue to increase when closing / opening the switch. Therefore, in the working process described above, the end cover will be in a state of stress deformation for a long time, so that the end cover will form cracks due to fatigue effect, which will cause the arc extinguishing chamber to leak and make the arc extinguishing chamber lose its insulation and breaking capacity; especially during the closing and opening operation of the vacuum arc extinguishing chamber, the frequent vibration of the vacuum arc extinguishing chamber end cover caused by the collision between the moving and static contacts of the vacuum arc extinguishing chamber will cause the metal material of the end cover to fatigue and lose its supporting function and sealing function, so that the vacuum arc extinguishing chamber loses its insulation and breaking capacity.
[0004] In order to improve the supporting strength of the vacuum interrupter, the general practice is to increase the thickness of the vacuum interrupter end cover to enhance the mechanical resistance of the end cover, which not only increases the amount of material used, but also makes the end cover more susceptible to damage and fatigue in long-term operation, and does not solve the problem from the root. This design limitation not only affects the reliability and durability of the equipment, but also increases maintenance costs and operational risks.
[0005] In the prior art, the load-bearing capacity of the end cap is increased by thickening the end cap to withstand the weight of the conductive parts, porcelain shell and bellows that increases with the increase of voltage / current level. The weight of the conductive parts, porcelain shell and bellows will be loaded on the edge of the end cap and the two ends of the conductive rod, and the stress at the connection between the end cap and the porcelain shell and the conductive rod will gradually increase. Thickening the end cap will increase its load-bearing limit and improve the weight bearing capacity of the vacuum arc chamber porcelain shell to a certain extent, but it still cannot change its stress accumulation during work. Fatigue effect will still be formed in the middle part of the end cap during long-term work. The problem is not fundamentally solved, and cracks will be generated during long-term work. Thickening the end cap will increase the overall weight of the arc chamber, and will also increase unnecessary application risks. In addition, due to the increase in thickness, stress concentration may be formed, and there is still a large fatigue risk, which will lead to the failure of the vacuum arc chamber.
[0006] The vacuum interrupter with the added moving conductive rod and moving contact will transfer greater impact energy to the end cover through the static end of the conductive rod. The thicker end cover will also cause material fatigue accumulation in the end cover material due to the greater impact energy, reducing reliability. Since the direction of the impact force in the hoisting working environment is upward along the conductive rod, which is opposite to the direction of gravity of the end cover, the thicker and heavier end cover will increase the risk of desoldering. Summary of the invention
[0007] In order to overcome the defects of the above-mentioned prior art, the purpose of the present invention is to provide a fatigue-resistant vacuum interrupter structure and a method of use, so as to solve the technical problem of how to improve the fatigue resistance of the vacuum interrupter in the prior art.
[0008] The present invention is achieved through the following technical solutions: In a first aspect, the present invention provides a fatigue-resistant vacuum interrupter structure, comprising a static contact, a first end cover, a porcelain shell, a second end cover, a bellows, and a moving conductive rod; The first end cover is welded and arranged at the top end of the ceramic shell, and the second end cover is welded and arranged at the bottom end of the ceramic shell; The static contact is arranged in the porcelain shell, and one end of the static contact is welded and arranged on the first end cover; The bellows is arranged in the porcelain shell, and one end of the bellows is welded to the second end cover; The moving conductive rod is arranged in the porcelain shell, the rod body of the moving conductive rod is sleeved in the corrugated tube, and the second end cover is arranged throughout; one end of the moving conductive rod is connected to the power mechanism, and the other end drives the moving conductive rod to make a closing and opening movement with the static contact in the porcelain shell through the power structure; The end surfaces of the first end cover and the second end cover are both provided with a convex structure.
[0009] Preferably, the protruding structure includes a plurality of protruding circular ring structures, and the plurality of protruding circular ring structures are distributed radially along the end surface of the first end cover or the second end cover with the end surface center hole of the first end cover or the second end cover as the center.
[0010] Furthermore, a plurality of raised annular structures form a corrugated structure in the radial direction of the end surface of the first end cover or the second end cover.
[0011] Preferably, the protrusion structure includes a plurality of reinforcing rib protrusion structures; the plurality of reinforcing rib protrusion structures are distributed circumferentially along the end surface of the first end cover or the second end cover with the end surface center hole of the first end cover or the second end cover as the center.
[0012] Furthermore, the thicknesses of the plurality of reinforcing rib protrusion structures are the same, and the plurality of reinforcing rib protrusion structures are all arranged toward the center hole position of the end surface of the first end cover or the second end cover.
[0013] Preferably, the protrusion structure comprises a plurality of annular protrusion blocks, and the plurality of annular protrusion blocks are distributed radially with the end surface center hole of the first end cover or the second end cover as the center.
[0014] Furthermore, the annular protrusion block includes a plurality of arc-shaped protrusion structures, and the plurality of arc-shaped protrusion structures are arranged around the end surface of the first end cover or the second end cover, and there are gaps between adjacent arc-shaped protrusion structures.
[0015] Furthermore, the center hole of the end surface of the first end cover or the second end cover is a coaxial hole.
[0016] Preferably, the protruding structure is arranged on opposite sides of the first end cap and the second end cap.
[0017] In a second aspect, the present invention further provides a method for using a fatigue-resistant vacuum interrupter structure, based on the above-mentioned fatigue-resistant vacuum interrupter structure, comprising the following process: The circuit-connecting power mechanism is started, and the moving conductive rod is pushed by the power structure to move along the axial direction of the bellows until the other end of the moving conductive rod is in close contact with the static contact to form a conductive path and complete the closing action; when the other end of the moving conductive rod is in close contact with the static contact, mechanical stress and thermal stress are generated, and when the mechanical stress and thermal stress are transmitted to the protruding structure of the first end cover, a plurality of stress release points are formed on the end face of the first end cover through the protruding structure, and finally the mechanical stress and thermal stress are dispersed.
[0018] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides a fatigue-resistant vacuum interrupter structure, which effectively disperses stress concentration and enhances the reliability of the structure by providing a protruding structure on the end faces of the first end cover and the second end cover. The protruding structure is customized according to the specific working conditions and stress conditions of the interrupter, ensuring the continuity and uniformity of the overall structure, thereby improving the fatigue tolerance of the end cover without reducing the insulation performance of the interrupter and the supporting function of the end cover.
[0019] Furthermore, the raised structure includes a plurality of raised circular ring structures, which are distributed radially along the end face of the first end cover or the second end cover with the center hole of the end face of the first end cover or the second end cover as the center; the plurality of raised circular ring structures form a corrugated structure radially along the end face of the first end cover or the second end cover. The raised circular ring structure can significantly improve the radial and axial bearing capacity of the end cover, effectively resist the mechanical stress and thermal stress generated by the closing and opening operations, and prevent the end cover from deformation or rupture. The corrugated distribution makes the stress distribution more uniform, reduces the stress concentration phenomenon, and further enhances the overall strength and rigidity of the structure.
[0020] Furthermore, the protrusion structure includes a plurality of reinforcing rib protrusion structures; the plurality of reinforcing rib protrusion structures are circumferentially distributed along the end face of the first end cover or the second end cover with the end face center hole of the first end cover or the second end cover as the center. The thickness of the plurality of reinforcing rib protrusion structures is the same, and the plurality of reinforcing rib protrusion structures are all arranged toward the end face center hole of the first end cover or the second end cover. As an additional supporting structure, the reinforcing rib protrusion structure significantly enhances the bearing capacity of the end cover in the circumferential direction and effectively resists the circumferential stress and deformation caused by operation. The reinforcing rib protrusion structures are all arranged toward the center hole, forming a centripetal reinforcement network, which enhances the overall rigidity and stability of the end cover.
[0021] Furthermore, the raised structure includes a plurality of annular raised blocks, which are distributed radially with the end face center hole of the first end cover or the second end cover as the center. The annular raised block includes a plurality of arcuate raised structures, which are arranged around the end face of the first end cover or the second end cover, and there are gaps between adjacent arcuate raised structures. As a reinforcing structure, the annular raised block significantly improves the bearing capacity of the end cover in the radial direction, and effectively resists radial stress and deformation caused by operation or external factors. The annular raised block and the arcuate raised structure help to disperse stress to a wider area, reduce stress concentration, and reduce the risk of fatigue damage caused by excessive local stress. The gap between adjacent arcuate raised structures allows a certain deformation space, which helps to alleviate stress concentration and improve the fatigue resistance of the structure.
[0022] The present invention also provides a method for using a fatigue-resistant vacuum interrupter structure. During the closing process, the close contact between the moving conductive rod and the static contact will generate mechanical stress and thermal stress. If these stresses are concentrated on a certain area of the end cover or the contact, material fatigue, deformation, or even rupture will occur. The present invention effectively disperses the mechanical stress and thermal stress to a wider area by providing a protruding structure on the first end cover and the second end cover. The protruding structure forms a plurality of stress release points on the end face, which can absorb and disperse stress and prevent stress concentration, thereby significantly improving the fatigue resistance of the end cover. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 Schematic diagram of the structure of a fatigue-resistant vacuum interrupter in an embodiment of the present invention; Figure 2 for Figure 1 Sectional schematic diagram of part A; Figure 3 for Figure 2 The enlarged schematic diagram of part B in the middle; Figure 4 This is a first structural schematic diagram of a first end cover in an embodiment of the present invention; Figure 5 for Figure 4 Schematic diagram of the cross section of part C; Figure 6 is a three-dimensional schematic diagram of a first structure of a first end cover structure in an embodiment of the present invention; Figure 7 A second structural schematic diagram of the first end cover in an embodiment of the present invention; Figure 8 for Figure 7 Middle D section schematic diagram; Fig. 9 A three-dimensional diagram of the second structure of the first end cover in an embodiment of the present invention; Fig.10 It is a front view of the third structure of the first end cover in an embodiment of the present invention; Fig.11 is a three-dimensional diagram of a third structure of the first end cover in an embodiment of the present invention; In the figure: 1. static contact; 2. first end cover; 3. porcelain shell; 4. second end cover; 5. bellows; 6. moving conductive rod; 7. raised structure. DETAILED DESCRIPTION
[0024] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.
[0025] The present invention is further described in detail below in conjunction with the accompanying drawings: The object of the present invention is to provide a fatigue-resistant vacuum interrupter structure and a method of use, so as to solve the technical problem of how to improve the fatigue resistance of the vacuum interrupter in the prior art.
[0026] The vacuum interrupter is the core component of medium and high voltage power switches. Its main function is to quickly extinguish the arc and suppress the current after the medium and high voltage circuit is cut off from the power supply through the excellent insulation of the vacuum in the interrupter, thereby achieving circuit control and protection. It is mainly used in power transmission and distribution control systems.
[0027] The end cap is an important part of the vacuum insulation system. Together with the vacuum insulation shell and stainless steel bellows, they ensure the sealing and stability of the vacuum interrupter. It not only provides mechanical support, but also forms a sealed environment with the shell to maintain the high vacuum state inside the interrupter. The end cap design needs to allow the moving contact and the moving conductive rod to move within the specified range to complete the closing and opening operations of the vacuum switch.
[0028] Example 1 See also Figure 1 , Figure 2 as well as Figure 3 In one embodiment of the present invention, a fatigue-resistant vacuum arc chamber structure is provided, comprising a static contact 1, a first end cover 2, a porcelain shell 3, a second end cover 4, a bellows 5 and a moving conductive rod 6; the first end cover 2 is welded and arranged at the top end of the porcelain shell 3, and the second end cover 4 is welded and arranged at the bottom end of the porcelain shell 3; the static contact 1 is arranged in the porcelain shell 3, and one end of the static contact 1 is welded and arranged on the first end cover 2; the bellows 5 is arranged in the porcelain shell 3, and one end of the bellows 5 is welded on the second end cover 4; the moving conductive rod 6 is arranged in the porcelain shell 3, and the rod body of the moving conductive rod 6 is sleeved in the bellows 5 and is arranged through the second end cover 4; one end of the moving conductive rod 6 is connected to the power mechanism, and the other end drives the moving conductive rod 6 to perform closing and opening movements with the static contact 1 in the porcelain shell 3 through the power structure; the end faces of the first end cover 2 and the second end cover 4 are both provided with a protruding structure 7.
[0029] according to Figure 4 , Figure 5 and Figure 6As shown, the protruding structure 7 includes a plurality of protruding circular ring structures, which are distributed along the radial direction of the end surface of the first end cover 2 or the second end cover 4 with the end surface center hole of the first end cover 2 or the second end cover 4 as the center. The plurality of protruding circular ring structures form a corrugated structure in the radial direction of the end surface of the first end cover 2 or the second end cover 4.
[0030] In this embodiment, the corrugated structure can be a combination of multiple continuous or discontinuous tangent smooth connections, and the parameters of the wave-shaped structure, such as wavelength, wave height and curvature, can be adjusted to adapt to different application requirements and working conditions. The continuous arrangement of multiple wave-shaped structures can achieve uniform stress distribution in a larger range, thereby further improving the reliability and durability of the structure.
[0031] This design takes into account the different stress levels that different areas may bear. By adjusting the radius of curvature, the stress distribution can be controlled more accurately and more sophisticated stress management can be achieved. In areas where stress is expected to be higher, a smaller radius of curvature can be designed to increase the local stress release capacity; in areas with lower stress, a larger radius of curvature can be used to maintain the integrity of the structure and the dispersion of the force after being subjected to stress.
[0032] Example 2 See also Figure 1 , Figure 2 as well as Figure 3 In one embodiment of the present invention, a fatigue-resistant vacuum arc chamber structure is provided, comprising a static contact 1, a first end cover 2, a porcelain shell 3, a second end cover 4, a bellows 5 and a moving conductive rod 6; the first end cover 2 is welded and arranged at the top end of the porcelain shell 3, and the second end cover 4 is welded and arranged at the bottom end of the porcelain shell 3; the static contact 1 is arranged in the porcelain shell 3, and one end of the static contact 1 is welded and arranged on the first end cover 2; the bellows 5 is arranged in the porcelain shell 3, and one end of the bellows 5 is welded on the second end cover 4; the moving conductive rod 6 is arranged in the porcelain shell 3, and the rod body of the moving conductive rod 6 is sleeved in the bellows 5 and is arranged through the second end cover 4; one end of the moving conductive rod 6 is connected to the power mechanism, and the other end drives the moving conductive rod 6 to perform closing and opening movements with the static contact 1 in the porcelain shell 3 through the power structure; the end faces of the first end cover 2 and the second end cover 4 are both provided with a protruding structure 7.
[0033] according to Figure 7 , Figure 8 and Fig. 9 The protrusion structure 7 includes a plurality of reinforcing rib protrusion structures; the plurality of reinforcing rib protrusion structures are distributed circumferentially along the end surface of the first end cover 2 or the second end cover 4 with the end surface center hole of the first end cover 2 or the second end cover 4 as the center. The plurality of reinforcing rib protrusion structures have the same thickness, and the plurality of reinforcing rib protrusion structures are all arranged toward the end surface center hole of the first end cover 2 or the second end cover 4.
[0034] In this embodiment, the rib protrusion structure serves as an additional supporting structure, significantly enhancing the bearing capacity of the end cover in the circumferential direction, and effectively resisting the circumferential stress and deformation caused by operation. The rib protrusion structures are all arranged toward the center hole, forming a centripetal reinforcement network, which enhances the overall rigidity and stability of the end cover.
[0035] Example 3 See also Figure 1 , Figure 2 as well as Figure 3 In one embodiment of the present invention, a fatigue-resistant vacuum arc chamber structure is provided, comprising a static contact 1, a first end cover 2, a porcelain shell 3, a second end cover 4, a bellows 5 and a moving conductive rod 6; the first end cover 2 is welded and arranged at the top end of the porcelain shell 3, and the second end cover 4 is welded and arranged at the bottom end of the porcelain shell 3; the static contact 1 is arranged in the porcelain shell 3, and one end of the static contact 1 is welded and arranged on the first end cover 2; the bellows 5 is arranged in the porcelain shell 3, and one end of the bellows 5 is welded on the second end cover 4; the moving conductive rod 6 is arranged in the porcelain shell 3, and the rod body of the moving conductive rod 6 is sleeved in the bellows 5 and is arranged through the second end cover 4; one end of the moving conductive rod 6 is connected to the power mechanism, and the other end drives the moving conductive rod 6 to perform closing and opening movements with the static contact 1 in the porcelain shell 3 through the power structure; the end faces of the first end cover 2 and the second end cover 4 are both provided with a protruding structure 7.
[0036] according to Fig.10 and Fig.11 As shown, the protrusion structure 7 includes a plurality of annular protrusion blocks, which are distributed radially with the end surface center hole of the first end cover 2 or the second end cover 4 as the center. The annular protrusion block includes a plurality of arc-shaped protrusion structures, which are arranged around the end surface of the first end cover 2 or the second end cover 4, and there are gaps between adjacent arc-shaped protrusion structures.
[0037] In this embodiment, the annular protrusion block serves as a reinforcement structure, which significantly improves the radial bearing capacity of the end cover and effectively resists radial stress and deformation caused by operation or external factors. The annular protrusion block and the arc-shaped protrusion structure help to disperse stress to a wider area, reduce stress concentration, and reduce the risk of fatigue damage caused by excessive local stress. The gap between adjacent arc-shaped protrusion structures allows a certain amount of deformation space, which helps to alleviate stress concentration and improve the fatigue resistance of the structure.
[0038] The present invention disperses the gravity and the impact force of closing / opening the end caps by designing a protruding structure 7 on the first end cap 2 and the second end cap 4, especially reduces the vibration impact caused by the collision of the large-mass vacuum interrupter during the closing / opening process, and greatly reduces the stress value at the maximum deformation of the end cap. The protruding structure 7 reduces the stress concentration phenomenon of the end cap caused by the excessive force applied at both ends of the end cap, significantly improves the impact resistance of the vacuum interrupter and the fatigue resistance of the supporting metal parts, and at the same time improves the sealing reliability of the vacuum interrupter and the mechanical service life of the interrupter.
[0039] The protruding structure 7 in the present invention can decompose the stress at the stress concentration point and play the functional characteristics of a buffer. By changing the structure, its force concentration state is changed. This method reduces the stress concentration in the middle of the end cover caused by the conductive rod and the thick porcelain shell at both ends of the end cover.
[0040] The raised structure 7 acts as a reinforcing rib, increases structural strength, and improves its bending resistance and impact resistance, especially buffering the frequent vibrations caused by impact during the closing / opening process of the vacuum interrupter, thereby weakening and suppressing the fatigue phenomenon of the vacuum interrupter end cover plate caused by frequent vibrations.
[0041] Example 4 The present invention provides a method for using a fatigue-resistant vacuum interrupter structure, based on the above-mentioned fatigue-resistant vacuum interrupter structure, comprising the following process: The circuit-connected power mechanism is started, and the dynamic conductive rod 6 is pushed by the power structure to move along the axial direction of the bellows 5 until the other end of the dynamic conductive rod 6 is in close contact with the static contact 1, forming a conductive path, and completing the closing action; when the other end of the dynamic conductive rod 6 is in close contact with the static contact 1, mechanical stress and thermal stress are generated. When the mechanical stress and thermal stress are transmitted to the protruding structure 7 of the first end cover 2, multiple stress release points are formed on the end surface of the first end cover 2 through the protruding structure 7, and finally the mechanical stress and thermal stress are dispersed. The presence of the raised structure in this embodiment not only disperses the stress, but also enhances the overall strength and rigidity of the end cover. This enables the vacuum arc chamber structure to maintain higher stability and durability when facing long-term, frequent operations and changes in the external environment. The stress concentration problem of the end cover of the vacuum arc chamber is effectively reduced. Compared with the prior art, the stress distribution is more uniform, thereby significantly reducing the occurrence of fatigue cracks. Importantly, this improvement does not change the main structure of the vacuum arc chamber, ensuring that the core performance of the equipment is not affected. The scheme of the present invention achieves effective control of stress concentration while maintaining key performance indicators such as the insulation / breaking capacity and service life of the circuit breaker. Due to the stress dispersion structure design of the end cover, the problem of increased impact force on the end cover as the mass of the vacuum arc chamber increases can be reduced. Since the mass of the end cover has not increased significantly, the end cover process does not increase the risk.
[0042] The solution of the present invention has shown good processing performance, installation and maintenance convenience in practical applications, and can adapt to different working environments, such as high temperature and high humidity, further enhancing its environmental adaptability. The present invention also shows good scalability and can be easily applied to other similar equipment or structures, providing a new solution for the design and manufacture of vacuum interrupters.
[0043] In the design of the raised structure, the present invention has accurately calculated and simulated the parameters such as position, curvature, width and height to ensure the best stress dispersion effect. The selection of these design parameters is based on a comprehensive consideration of the stress analysis of the arc extinguishing chamber working conditions and the insulation performance, aiming to improve the fatigue tolerance of the end cover while ensuring that the insulation performance of the arc extinguishing chamber is not affected. In addition, special attention is paid to the processing performance and processing capacity of the arched corrugated structure, which is adapted to the existing processing technology, can ensure manufacturing accuracy and production efficiency, and control costs. This comprehensive consideration method not only ensures that the technical requirements are met, but also takes into account the feasibility and economy of actual production.
[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.
Claims
1. A fatigue-resistant vacuum interrupter structure, characterized in that: It comprises a stationary contact (1), a first end cover (2), a porcelain shell (3), a second end cover (4), a bellows (5) and a moving conductive rod (6); The first end cover (2) is welded to the top end of the ceramic shell (3), and the second end cover (4) is welded to the bottom end of the ceramic shell (3); The stationary contact (1) is arranged in the porcelain shell (3), and one end of the stationary contact (1) is welded and arranged on the first end cover (2); The bellows (5) is arranged in the porcelain shell (3), and one end of the bellows (5) is welded to the second end cover (4); The movable conductive rod (6) is arranged in the porcelain shell (3), the rod body of the movable conductive rod (6) is sleeved in the corrugated tube (5), and is arranged through the second end cover (4); one end of the movable conductive rod (6) is connected to the power mechanism, and the other end drives the movable conductive rod (6) to perform closing and opening movements with the static contact (1) in the porcelain shell (3) through the power structure; The end surfaces of the first end cover (2) and the second end cover (4) are both provided with a protruding structure (7).
2. The anti-fatigue vacuum interrupter structure according to claim 1, characterized in that: The protruding structure (7) comprises a plurality of protruding circular ring structures, and the plurality of protruding circular ring structures are distributed radially along the end surface of the first end cover (2) or the second end cover (4) with the end surface center hole of the first end cover (2) or the second end cover (4) as the center.
3. The anti-fatigue vacuum interrupter structure according to claim 2, characterized in that: A plurality of raised circular ring structures form a corrugated structure in the radial direction of the end surface of the first end cover (2) or the second end cover (4).
4. The anti-fatigue vacuum interrupter structure according to claim 1, characterized in that: The protrusion structure (7) comprises a plurality of reinforcing rib protrusion structures; the plurality of reinforcing rib protrusion structures are distributed circumferentially along the end surface of the first end cover (2) or the second end cover (4) with the end surface center hole of the first end cover (2) or the second end cover (4) as the center.
5. The anti-fatigue vacuum interrupter structure according to claim 4, characterized in that: The thickness of the plurality of reinforcing rib protrusion structures is the same, and the plurality of reinforcing rib protrusion structures are all arranged towards the end face center hole position of the first end cover (2) or the second end cover (4).
6. The anti-fatigue vacuum interrupter structure according to claim 1, characterized in that: The protrusion structure (7) comprises a plurality of annular protrusion blocks, and the plurality of annular protrusion blocks are distributed radially with the end face center hole of the first end cover (2) or the second end cover (4) as the center.
7. The anti-fatigue vacuum interrupter structure according to claim 6, characterized in that: The annular protruding block comprises a plurality of arc-shaped protruding structures, the plurality of arc-shaped protruding structures are arranged around the end surface of the first end cover (2) or the second end cover (4), and there are gaps between adjacent arc-shaped protruding structures.
8. A fatigue-resistant vacuum interrupter structure according to claim 2, 4 or 6, characterized in that: The end face center hole of the first end cover (2) or the second end cover (4) is a coaxial hole.
9. The anti-fatigue vacuum interrupter structure according to claim 1, characterized in that: The protruding structure (7) is arranged on opposite sides of the first end cover (2) and the second end cover (4).
10. A method for using a fatigue-resistant vacuum interrupter structure, based on the fatigue-resistant vacuum interrupter structure according to any one of claims 1 to 9, characterized in that: The process includes the following: The circuit-connecting power mechanism is started, and the power structure pushes the moving conductive rod (6) to move along the axial direction of the bellows (5) until the other end of the moving conductive rod (6) is in close contact with the static contact (1), forming a conductive path, and completing the closing action; When the other end of the moving conductive rod (6) is in close contact with the stationary contact (1), mechanical stress and thermal stress are generated. When the mechanical stress and thermal stress are transmitted to the protruding structure (7) of the first end cover (2), a plurality of stress release points are formed on the end surface of the first end cover (2) through the protruding structure (7), and the mechanical stress and thermal stress are finally dispersed.