Corrugated pipe structure, vacuum arc-extinguishing chamber and high-voltage switch

Abstract

The invention relates to a corrugated pipe structure, a vacuum arc-extinguishing chamber and a high-voltage switch, and the corrugated pipe structure comprises at least two single-stage corrugated pipes and at least one guide structure, and the at least two single-stage corrugated pipes are arranged and are used for telescopically sleeving the periphery of a movable conductive rod; the corrugation numbers of at least part of the single-stage corrugated pipes in all the single-stage corrugated pipes are different; each guiding structure comprises a connecting ring and a plurality of contact finger structures arranged on the inner side of the connecting ring, one connecting ring is connected between every two adjacent single-stage corrugated pipes in a sealed mode, the connecting rings and all the single-stage corrugated pipes are coaxially arranged, and the contact finger structures of the same guiding structure are evenly arranged in the circumferential direction of the corresponding connecting ring at intervals. And one end, deviating from the corresponding connecting ring, of the contact finger structure is used for movably contacting and matching with the outer surface of the movable conducting rod. The corrugated pipe structure can effectively reduce friction work in the switching-on and switching-off operation process through hierarchical design, effectively improve the breaking capacity of the vacuum arc-extinguishing chamber and prolong the service life of the vacuum arc-extinguishing chamber.

Description

Technical Field

[0001] This application relates to the field of vacuum circuit breakers and vacuum interruption technology, and in particular to a bellows structure, a vacuum interrupter, and a high-voltage switch. Background Technology

[0002] Vacuum circuit breakers are key switching devices that use vacuum as the insulation and arc-extinguishing medium, playing a vital role in ensuring the safe and stable operation of power systems. Compared to other types of circuit breakers, vacuum circuit breakers have been widely used in medium and low voltage breaking applications due to their significant advantages such as high breaking capacity, low maintenance costs, and environmental friendliness. The vacuum interrupter, as the core component of a vacuum circuit breaker, directly determines the circuit breaker's ability to successfully interrupt fault currents and its overall operational reliability.

[0003] Currently, vacuum interrupters are rapidly developing towards higher power transmission levels. With the rapid increase in voltage levels, the contact gap and the diameter of the moving-side conductive rod are significantly increasing. This increase in contact gap and the opening speed of the moving conductive rod leads to a substantial increase in the diameter and length of the bellows. Consequently, during closing and opening operations, the friction between the moving conductive rod and the bellows intensifies, affecting the service life of the vacuum interrupter. Summary of the Invention

[0004] Therefore, it is necessary to provide a bellows structure, a vacuum interrupter, and a high-voltage switch to address the problem of increased friction between the moving conductive rod and the bellows as the diameter and length of the bellows increase.

[0005] The technical solution is as follows:

[0006] In a first aspect, this application provides a bellows structure, comprising at least two single-stage bellows and at least one guide structure. The at least two single-stage bellows are arranged in a row and are each used to be retractably fitted onto the outer periphery of a moving conductive rod. At least some of the single-stage bellows have different numbers of corrugations. Each guide structure includes a connecting ring and a plurality of finger structures disposed inside the connecting ring. A connecting ring is sealed between two adjacent single-stage bellows. The connecting ring is coaxially arranged with all the single-stage bellows. The plurality of finger structures of the same guide structure are evenly spaced along the circumferential direction of the corresponding connecting ring. One end of the finger structure facing away from the corresponding connecting ring is used to movably contact and engage with the outer surface of the moving conductive rod.

[0007] The technical solution will be further explained below:

[0008] In one embodiment, the number of single-stage bellows is between 3 and 20.

[0009] In one embodiment, the number of corrugations of the at least three single-stage bellows is configured to gradually decrease from the side closest to the moving contact to the other side.

[0010] In one embodiment, the number of single-stage bellows is at least three, the number of guide structures is at least two, and the number of finger structures in any two guide structures may be the same or different.

[0011] In one embodiment, the number of the finger structures in the guide structure is between 3 and 30.

[0012] In one embodiment, the finger structure includes a connecting portion and a contact portion. One end of the connecting portion is connected to the corresponding connecting ring, and the other end is connected to the contact portion. In the axial direction of the connecting ring, the width of the contact portion is greater than the width of the connecting portion. The end of the contact portion away from the connecting portion has a contact plane, which is used to slide and engage with the outer surface of the moving conductive rod.

[0013] In one embodiment, the two sides of the contact portion that are arranged opposite to each other along the axial direction of the connecting ring are provided with rounded corners at the connection points with the contact plane.

[0014] In one embodiment, the finger structure includes a cantilever portion and a rolling portion. One end of the cantilever portion is connected to the corresponding connecting ring, and the other end is rotatably connected to the rolling portion. The rolling portion is used to roll and engage with the surface of the moving conductive rod.

[0015] Secondly, this application provides a vacuum interrupter, including a ceramic shell, a moving end cover plate, a stationary end cover plate, a stationary contact, a stationary conductive rod, a moving contact, a moving conductive rod, an upper shield, and a bellows structure as described in any one of the above. The moving end cover plate and the stationary end cover plate are respectively disposed at both ends of the ceramic shell to jointly enclose and form an interrupter cavity. The stationary contact, the moving contact, the upper shield, and the bellows structure are all disposed in the interrupter cavity. The moving contact and the stationary contact are disposed opposite to each other. One end of the stationary conductive rod is connected to the end of the stationary contact away from the moving contact, and the other end extends out of the stationary end cover plate. One end of the moving conductive rod is connected to the end of the moving contact away from the stationary contact, and the other end slidably extends out of the moving end cover plate. The bellows structure is telescopically sleeved on the moving conductive rod. One end of the bellows structure is connected to the moving end cover plate, and the other end is connected to the upper shield.

[0016] Thirdly, this application provides a high-voltage switch, including the aforementioned vacuum interrupter.

[0017] In the aforementioned bellows structure, vacuum interrupter, and high-voltage switch, at least two single-stage bellows are arranged and fitted around the outer periphery of the moving conductive rod. Adjacent single-stage bellows are connected by a guide structure, and the connecting ring is coaxially arranged with all single-stage bellows. Therefore, the coaxial arrangement of at least two single-stage bellows and the guide structure fitted around the outer periphery of the moving conductive rod forms a multi-stage series connection structure. This allows the bellows structure to be applied to the vacuum interrupter, and during the closing and opening operations of the vacuum interrupter, all single-stage bellows and the guide structure can move together. Because the bellows structure adopts a graded design and the guide structure is equipped with multiple contact fingers that can movably contact and engage with the surface of the moving conductive rod, the length of each single-stage bellows is shorter than that of a one-piece bellows. Furthermore, the multiple contact fingers can form multi-point guiding contact on the surface of the moving conductive rod. This allows the deformation of each single-stage bellows to be smaller than that of a one-piece bellows during the opening and closing operations. The guide structure can also effectively guide the single-stage bellows, thereby preventing the moving conductive rod and the bellows structure from shifting or becoming eccentric during movement. This reduces frictional losses between the moving conductive rod and the bellows structure during opening and closing, and extends the service life of the bellows structure. Furthermore, since at least some of the single-stage bellows have different numbers of corrugations, this bellows structure can be further optimized by differentiating the number of corrugations in all single-stage bellows. This allows for adjustments to the travel stroke, inertia, and speed of the single-stage bellows at different positions during the closing and opening process, thereby improving the traveling wave characteristics of the bellows structure and increasing its mechanical life in high-voltage vacuum circuit breakers. Therefore, through its tiered design, this bellows structure effectively reduces frictional work during closing and opening operations while simultaneously adjusting the traveling wave characteristics, effectively improving the breaking capacity and service life of the vacuum interrupter. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the bellows structure in one embodiment.

[0019] Figure 2 This is a cross-sectional schematic diagram of a bellows structure in one embodiment.

[0020] Figure 3 This is a schematic diagram of the guide structure in one embodiment.

[0021] Figure 4 This is a schematic diagram of the structure of a vacuum interrupter in one embodiment.

[0022] Figure 5 This is a cross-sectional structural schematic diagram of a vacuum interrupter in one embodiment.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1000, Vacuum interrupter; 100, Bellows structure; 110, Single-stage bellows; 120, Guide structure; 121, Connecting ring; 122, Finger structure; 1221, Connecting part; 1222, Contact part; 1222a, Contact plane; 1222b, Rounded corner; 200a, Interruption chamber; 201, Ceramic shell; 202, Stationary end cover plate; 203, Stationary conductive rod; 204, Moving conductive rod; 205, Moving end cover plate; 206, Stationary end shield; 207, Stationary contact; 208, Central main shield; 209, Moving contact; 210, Moving end shield; 211, Upper end shield. Detailed Implementation

[0025] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0026] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0027] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0031] See Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 1 A schematic diagram of the bellows structure 100 in one embodiment of this application is shown. Figure 2 A cross-sectional view of the bellows structure 100 in one embodiment is shown. Figure 3 A schematic diagram of the guide structure 120 in one embodiment is shown. Figure 4 A schematic diagram of a vacuum interrupter 1000 in one embodiment is shown. An embodiment of this application provides a bellows structure 100, including at least two single-stage bellows 110 and at least one guide structure 120. Wherein:

[0032] At least two single-stage bellows 110 are arranged in a row, and both are used to be telescopically fitted around the outer periphery of the moving conductive rod 204. At least some of the single-stage bellows 110 have different numbers of corrugations. Each guide structure 120 includes a connecting ring 121 and a plurality of finger structures 122 disposed inside the connecting ring 121. A connecting ring 121 is sealed between two adjacent single-stage bellows 110. The connecting ring 121 is coaxially arranged with all the single-stage bellows 110. The plurality of finger structures 122 of the same guide structure 120 are evenly spaced along the circumferential direction of the corresponding connecting ring 121. The end of the finger structure 122 facing away from the corresponding connecting ring 121 is used to movably contact and engage with the outer surface of the moving conductive rod 204.

[0033] In the aforementioned bellows structure 100, at least two single-stage bellows 110 are arranged and sleeved on the outer periphery of the moving conductive rod 204. Adjacent single-stage bellows 110 are connected by a guide structure 120, and the connecting ring 121 is coaxially arranged with all the single-stage bellows 110. Therefore, at least two single-stage bellows 110 are coaxially arranged, and the guide structure 120 is sleeved on the outer periphery of the moving conductive rod 204 to form a multi-stage series connection structure. This allows the bellows structure 100 to be applied to the vacuum interrupter 1000, and when the vacuum interrupter 1000 performs closing and opening operations, all the single-stage bellows 110 and the guide structure 120 can move together. Because the bellows structure 100 adopts a graded design and the guide structure 120 is provided with multiple contact finger structures 122 that can movably contact and cooperate with the surface of the moving conductive rod 204, the length of each single-stage bellows 110 is shorter than that of the integral bellows. Moreover, the multiple contact finger structures 122 can form multi-point guiding contact on the surface of the moving conductive rod 204. This makes the deformation of each single-stage bellows 110 smaller than that of the integral bellows during the opening and closing operations. Furthermore, the guide structure 120 can effectively guide the single-stage bellows 110, thereby preventing the moving conductive rod 204 and the bellows structure 100 from deviating or becoming eccentric during the movement. This reduces the frictional loss between the moving conductive rod 204 and the bellows structure 100 during opening and closing, and extends the service life of the bellows structure 100. Furthermore, since at least some of the single-stage bellows 110 have different numbers of corrugations, the bellows structure 100 can also adjust the travel stroke, inertia, and speed of the single-stage bellows 110 at different positions during the closing and opening process by differentiating the number of corrugations in all the single-stage bellows 110. This further optimizes the traveling wave characteristics of the bellows structure 100 and improves the mechanical life of the bellows structure 100 in the high-voltage vacuum circuit breaker. Therefore, through its graded design, the bellows structure 100 can effectively reduce the frictional work during the closing and opening operation, while also adjusting the traveling wave characteristics of the bellows structure 100, effectively improving the breaking capacity and service life of the vacuum interrupter 1000. In addition, the bellows structure 100 is easy to assemble, which can promote the development of the vacuum interrupter 1000 to higher voltage levels.

[0034] Schematic, the finger structure 122 extends radially from one end of the corresponding connecting ring 121 away from the connecting ring 121.

[0035] Schematic illustration: "At least some of the single-stage bellows 110 have different numbers of corrugations" means that the number of corrugations in all the single-stage bellows 110 can be partially different or completely different. This allows the bellows structure 100 to set the number of corrugations in each position according to actual needs, so that the stroke, inertia, and speed of the single-stage bellows 110 at each position can match the traveling wave characteristics of the corresponding position, thereby improving the service life of the bellows structure 100. "Partially different" means that at least two of the single-stage bellows 110 have different numbers of corrugations. For example, when there are 5 single-stage bellows 110, two of them have 6 corrugations, two have 5 corrugations, and the other has 8 corrugations.

[0036] Optionally, the number of single-stage bellows 110 can be designed according to actual needs. For example, in one embodiment, the number of single-stage bellows 110 is between 3 and 20. Thus, the number of single-stage bellows 110 can be adjusted according to the voltage level of the vacuum interrupter 1000 to ensure the reliability and stability of the vacuum interrupter 1000 during closing and opening operations. Preferably, the number of single-stage bellows 110 is three.

[0037] Optionally, in the arrangement direction of at least two single-stage bellows 110, the number of corrugations in each single-stage bellows 110 can be designed according to actual needs. For example, they can be increased or decreased sequentially. Alternatively, when the number of single-stage bellows 110 is at least three, the number of corrugations in each single-stage bellows 110 can also be arranged in a certain pattern, such as increasing first and then decreasing, or decreasing first and then increasing, or decreasing and then increasing in sequence, or increasing and decreasing in sequence, etc. Preferably, in one embodiment, the number of corrugations in at least two single-stage bellows 110 is configured to gradually decrease from the side closest to the moving contact 209 to the other side. Thus, the number of corrugations in each individual bellows 110 is different, and the length of each individual bellows 110 can gradually decrease from the side closest to the moving contact 209 to the other side. This facilitates more precise axial movement of the moving conductive rod 204 and the bellows structure 100, thereby reducing friction between the moving conductive rod 204 and the bellows structure 100. In addition, since the individual bellows 110 closest to the moving contact 209 has the largest stroke, the most drastic speed change, and the strongest inertial impact force, setting a larger number of corrugations in the individual bellows 110 closest to the moving contact 209 can effectively reinforce the most vulnerable individual bellows 110 in the bellows structure 100, thereby improving the overall lifespan of the bellows structure 100.

[0038] Optionally, the number of single-stage bellows 110 is at least three, and the number of guide structures 120 is at least two. The number of contact structures 122 in any two guide structures 120 may be the same or different. In this way, each guide structure 120 can form effective multi-point guiding contact with the moving conductive rod 204 using multiple contact structures 122 to ensure the guiding effect, effectively adjust the traveling wave characteristics of the bellows structure 100, thereby effectively reducing the friction between the bellows structure 100 and the moving guide tube, and improving the service life of the vacuum interrupter 1000.

[0039] As an illustration, the materials and thicknesses of different guide structures 120 can be designed as needed.

[0040] Optional, such as Figure 3 As shown, the number of finger structures 122 in the guide structure 120 is between 3 and 30. In this way, the guide structure 120 can effectively guide the bellows structure 100 and the moving conductive rod 204 to reduce the friction between the moving conductive rod 204 and the bellows structure 100 when the moving conductive rod 204 moves, thereby helping to improve the service life of the vacuum interrupter 1000.

[0041] In one embodiment, such as Figure 3 As shown, the finger structure 122 includes a connecting portion 1221 and a contact portion 1222. One end of the connecting portion 1221 is connected to a corresponding connecting ring 121, and the other end is connected to the contact portion 1222. In the axial direction of the connecting ring 121, the width of the contact portion 1222 is greater than the width of the connecting portion 1221. The end of the contact portion 1222 facing away from the connecting portion 1221 has a contact plane 1222a, which is used for sliding engagement with the outer surface of the moving conductive rod 204. Thus, since the width of the contact portion 1222 is greater than the width of the connecting portion 1221 in the axial direction of the connecting ring 121, the finger structure 122 is a "T"-shaped structure. This effectively increases the area of ​​the contact plane 1222a in the contact portion 1222, allowing for a larger contact area between the contact plane 1222a and the moving guide rod. This further improves the guiding effect of the guide structure 120 and reduces friction between the moving conductive rod 204 and the bellows structure 100.

[0042] Schematic, the end of the connecting portion 1221 that is away from the corresponding connecting ring 121 extends radially along the connecting ring 121.

[0043] Furthermore, such as Figure 3As shown, in one embodiment, the two sides of the contact portion 1222 that are arranged opposite to each other along the axial direction of the connecting ring 121 are provided with rounded corners 1222b at the connection points with the contact plane 1222a. In this way, the guiding effect of the guide structure 120 can be optimized by means of the rounded corners 1222b, and the friction between the moving conductive rod 204 and the bellows structure 100 can be further reduced.

[0044] In another embodiment, the finger structure 122 includes a cantilever portion and a rolling portion. One end of the cantilever portion is connected to a corresponding connecting ring 121, and the other end is rotatably connected to the rolling portion. The rolling portion is used for rolling engagement with the surface of the moving conductive rod 204. Thus, the guide structure 120 can utilize multiple finger structures 122 to form multi-point guiding contact with the moving conductive rod 204, thereby increasing the guiding effect and preventing the moving conductive rod 204 and the bellows structure 100 from shifting or becoming eccentric during movement. Furthermore, the rolling engagement between the rolling portion and the moving conductive rod 204 reduces friction between the finger structures 122 and the moving conductive rod 204, further reducing frictional loss between the moving conductive rod 204 and the guide structure 120 during movement.

[0045] Schematic illustration: the rotation axis of the rolling part is set perpendicular to the axis of the moving conductive rod 204. In this way, the rolling part can better roll with the moving conductive rod 204.

[0046] Schematic, the end of the cantilever that is away from the corresponding connecting ring 121 extends radially along the connecting ring 121.

[0047] See Figures 1 to 5 , Figure 5 The diagram shows a cross-sectional view of a vacuum interrupter 1000 according to one embodiment. This application also provides a vacuum interrupter 1000, including a ceramic shell 201, a moving end cover 205, a stationary end cover 202, a stationary contact 207, a stationary conductive rod 203, a moving contact 209, a moving conductive rod 204, an upper shield 211, and a bellows structure 100 as described in any of the above embodiments. The moving end cover 205 and the stationary end cover 202 are respectively disposed at both ends of the ceramic shell 201 to jointly enclose and form an interrupter cavity 200a. The stationary contact 207, the moving contact 209, and the upper shield 211... Both the 11 and the bellows structure 100 are located in the arc-extinguishing cavity 200a. The moving contact 209 and the stationary contact 207 are arranged opposite each other. One end of the stationary conductive rod 203 is connected to the end of the stationary contact 207 away from the moving contact 209, and the other end extends out of the stationary end cover plate 202. One end of the moving conductive rod 204 is connected to the end of the moving contact 209 away from the stationary contact 207, and the other end can slide out of the moving end cover plate 205. The bellows structure 100 is telescopically fitted onto the moving conductive rod 204. One end of the bellows structure 100 is connected to the moving end cover plate 205, and the other end is connected to the upper shield 211.

[0048] In the aforementioned vacuum interrupter 1000, at least two single-stage bellows 110 are arranged and sleeved on the outer periphery of the moving conductive rod 204. Adjacent single-stage bellows 110 are connected by a guide structure 120, and the connecting ring 121 is coaxially arranged with all the single-stage bellows 110. Therefore, at least two single-stage bellows 110 are coaxially arranged, and the guide structure 120 is sleeved on the outer periphery of the moving conductive rod 204 to form a multi-stage series connection structure. This allows all the single-stage bellows 110 and the guide structure 120 to move together when the vacuum interrupter 1000 performs closing and opening operations. Because the bellows structure 100 adopts a graded design and the guide structure 120 is provided with multiple contact finger structures 122 that can movably contact and cooperate with the surface of the moving conductive rod 204, the length of each single-stage bellows 110 is shorter than that of the integral bellows. Moreover, the multiple contact finger structures 122 can form multi-point guiding contact on the surface of the moving conductive rod 204. This makes the deformation of each single-stage bellows 110 smaller than that of the integral bellows during the opening and closing operations. Furthermore, the guide structure 120 can effectively guide the single-stage bellows 110, thereby preventing the moving conductive rod 204 and the bellows structure 100 from deviating or becoming eccentric during the movement. This reduces the frictional loss between the moving conductive rod 204 and the bellows structure 100 during opening and closing, and extends the service life of the bellows structure 100. Furthermore, since at least some of the single-stage bellows 110 have different numbers of corrugations, the bellows structure 100 can also adjust the travel stroke, inertia, and speed of the single-stage bellows 110 at different positions during the closing and opening process by differentiating the number of corrugations in all the single-stage bellows 110. This further optimizes the traveling wave characteristics of the bellows structure 100 and improves the mechanical life of the bellows structure 100 in the high-voltage vacuum circuit breaker. Therefore, through the graded design of the bellows structure 100, the vacuum interrupter 1000 can effectively reduce the frictional work during the closing and opening operation, and at the same time adjust the traveling wave characteristics of the bellows structure 100, effectively improving the breaking capacity and service life of the vacuum interrupter 1000.

[0049] Furthermore, in one embodiment, the vacuum interrupter 1000 further includes a stationary end shield 206, a moving end shield 210, and a central main shield 208. The stationary end shield 206, the moving end shield 210, and the central main shield 208 are all disposed within the interruption cavity 200a. The stationary end shield 206 is disposed on the stationary end cover plate 202, the moving end shield 210 is disposed on the moving end cover plate 205, and the central main shield 208 is sleeved on the outer periphery of the moving contact 209 and the stationary contact 207. This effectively ensures the reliability and stability of the vacuum interrupter 1000 during opening and closing operations.

[0050] This application also provides a high-voltage switch, including the vacuum interrupter 1000 in any of the above embodiments.

[0051] In the aforementioned high-voltage switch, at least two single-stage bellows 110 are arranged and sleeved on the outer periphery of the moving conductive rod 204. Adjacent single-stage bellows 110 are connected by a guide structure 120, and the connecting ring 121 is coaxially arranged with all the single-stage bellows 110. Therefore, at least two single-stage bellows 110 are coaxially arranged, and the guide structure 120 is sleeved on the outer periphery of the moving conductive rod 204 to form a multi-stage series connection structure. This allows all the single-stage bellows 110 and the guide structure 120 to move together when the vacuum interrupter 1000 performs closing and opening operations. Because the bellows structure 100 adopts a graded design and the guide structure 120 is provided with multiple contact finger structures 122 that can movably contact and cooperate with the surface of the moving conductive rod 204, the length of each single-stage bellows 110 is shorter than that of the integral bellows. Moreover, the multiple contact finger structures 122 can form multi-point guiding contact on the surface of the moving conductive rod 204. This makes the deformation of each single-stage bellows 110 smaller than that of the integral bellows during the opening and closing operations. Furthermore, the guide structure 120 can effectively guide the single-stage bellows 110, thereby preventing the moving conductive rod 204 and the bellows structure 100 from deviating or becoming eccentric during the movement. This reduces the frictional loss between the moving conductive rod 204 and the bellows structure 100 during opening and closing, and extends the service life of the bellows structure 100. Furthermore, since at least some of the single-stage bellows 110 have different numbers of corrugations, the bellows structure 100 can also adjust the travel stroke, inertia, and speed of the single-stage bellows 110 at different positions during the closing and opening process by differentiating the number of corrugations of all the single-stage bellows 110. This further optimizes the traveling wave characteristics of the bellows structure 100 and improves the mechanical life of the bellows structure 100 in the high-voltage vacuum circuit breaker. Therefore, through the graded design of the bellows structure 100, this high-voltage switch can effectively reduce the frictional work during the closing and opening operation, and at the same time adjust the traveling wave characteristics of the bellows structure 100, effectively improving the breaking capacity and service life of the vacuum interrupter 1000.

[0052] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A bellows structure, characterized in that, The device includes at least two single-stage bellows and at least one guide structure. The at least two single-stage bellows are arranged in a row and are both used to be retractably fitted around the outer periphery of a moving conductive rod. At least some of the single-stage bellows have different numbers of corrugations. Each guide structure includes a connecting ring and a plurality of finger structures disposed inside the connecting ring. A connecting ring is sealed between two adjacent single-stage bellows. The connecting ring and all the single-stage bellows are coaxially arranged. The plurality of finger structures of the same guide structure are evenly spaced along the circumferential direction of the corresponding connecting ring. The end of the finger structure facing away from the corresponding connecting ring is used to movably contact and engage with the outer surface of the moving conductive rod.

2. The corrugated pipe structure according to claim 1, characterized in that, The number of single-stage bellows is between 3 and 20.

3. The corrugated pipe structure according to claim 1, characterized in that, The number of corrugations in the at least three single-stage bellows is configured to gradually decrease from the side closest to the moving contact to the other side.

4. The corrugated pipe structure according to claim 1, characterized in that, The number of single-stage bellows is at least three, the number of guide structures is at least two, and the number of finger structures in any two guide structures may be the same or different.

5. The corrugated pipe structure according to claim 1, characterized in that, The number of the finger structures in the guide structure is between 3 and 30.

6. The corrugated pipe structure according to claim 1, characterized in that, The finger structure includes a connecting part and a contact part. One end of the connecting part is connected to the corresponding connecting ring, and the other end is connected to the contact part. In the axial direction of the connecting ring, the width of the contact part is greater than the width of the connecting part. The end of the contact portion away from the connecting portion has a contact plane, which is used to slide and engage with the outer surface of the moving conductive rod.

7. The corrugated pipe structure according to claim 6, characterized in that, The two sides of the contact portion, which are arranged opposite to each other along the axial direction of the connecting ring, are provided with rounded corners at the connection points with the contact plane.

8. The corrugated pipe structure according to claim 1, characterized in that, The touch finger structure includes a cantilever part and a rolling part. One end of the cantilever part is connected to the corresponding connecting ring, and the other end is rotatably connected to the rolling part. The rolling part is used to roll and engage with the surface of the moving conductive rod.

9. A vacuum interrupter, characterized in that, The device includes a ceramic shell, a moving end cover plate, a stationary end cover plate, a stationary contact, a stationary conductive rod, a moving contact, a moving conductive rod, an upper shield, and a bellows structure as described in any one of claims 1 to 8. The moving end cover plate and the stationary end cover plate are respectively disposed at both ends of the ceramic shell to jointly enclose an arc-extinguishing cavity. The stationary contact, the moving contact, the upper shield, and the bellows structure are all disposed in the arc-extinguishing cavity. The moving contact and the stationary contact are disposed opposite to each other. One end of the stationary conductive rod is connected to the end of the stationary contact away from the moving contact, and the other end extends out of the stationary end cover plate. One end of the moving conductive rod is connected to the end of the moving contact away from the stationary contact, and the other end slidably extends out of the moving end cover plate. The bellows structure is telescopically sleeved on the moving conductive rod. One end of the bellows structure is connected to the moving end cover plate, and the other end is connected to the upper shield.

10. A high-voltage switch, characterized in that, Includes the vacuum interrupter as described in claim 9.

Images