Vacuum interrupter and vacuum circuit breaker

Abstract

This application provides a vacuum interrupter and a vacuum circuit breaker. The vacuum interrupter includes: a bellows structure comprising a bellows body and a first locking structure, wherein the bellows body has an internal accommodating cavity, and the first locking structure is disposed on the cavity surface of the accommodating cavity; and a guide sleeve structure comprising a second locking structure and a guide sleeve body, wherein the second locking structure is disposed on the outer peripheral wall of the guide sleeve body, and the guide sleeve body is at least partially disposed within the accommodating cavity. The second locking structure cooperates with the first locking structure to restrict the axial movement of the guide sleeve body along the bellows body. In this embodiment, the guide sleeve structure can reduce the occurrence of columnar instability in the bellows body, thereby improving its service life. Simultaneously, the bellows body and the guide sleeve body can maintain synchronous movement in the axial direction of the bellows body, effectively preventing additional impacts caused by relative movement between the two.

Description

Technical Field

[0001] This application relates to the field of vacuum circuit breaker technology, and more particularly to vacuum interrupters and vacuum circuit breakers. Background Technology

[0002] In related technologies, vacuum interrupters are a type of interrupting unit that uses vacuum as the arc-extinguishing medium and the insulating medium for the contact gap after arc extinguishing. They do not contain SF6 gas and have advantages such as small size, light weight, environmental friendliness, and no maintenance required. They are gradually being promoted from medium-voltage power distribution level to high-voltage power transmission level.

[0003] Among them, the bellows is the most important component in the vacuum interrupter, and its reliability directly determines the mechanical reliability of the entire interrupter. With the increase in voltage levels, the pressure, speed, and impact on the bellows used in vacuum interrupters are also increasing, placing higher and more stringent requirements on the bellows' structure and stiffness. Under high speed and high load impact, the bellows is prone to columnar instability. Extensive theoretical research has shown that after columnar instability during movement, the bellows will experience lateral displacement. The impact of lateral displacement on lifespan is far greater than that of axial tension and compression (7 times), thus affecting the service life of the entire unit of the vacuum interrupter. Summary of the Invention

[0004] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a vacuum interrupter and a vacuum circuit breaker, which can effectively prevent columnar instability of the bellows structure, and at the same time enable the guide sleeve structure to move synchronously with the bellows structure.

[0005] One embodiment of this application provides a vacuum interrupter, comprising:

[0006] A bellows structure includes a bellows body and a first locking structure. The bellows body has an internal accommodating cavity, and the first locking structure is disposed on the cavity surface of the accommodating cavity.

[0007] The guide sleeve structure includes a second locking structure and a guide sleeve body. The second locking structure is disposed on the outer peripheral wall of the guide sleeve body. The guide sleeve body is at least partially disposed within the receiving cavity. The second locking structure is engaged with the first locking structure to restrict the axial movement of the guide sleeve body along the bellows body.

[0008] Furthermore, the first locking structure includes two locking protrusions, which are spaced apart along the axial direction of the bellows body on the cavity wall of the receiving cavity, wherein a locking groove is defined between the two locking protrusions, and the second locking structure is a protrusion disposed within the locking groove.

[0009] Furthermore, the first locking structure has multiple first locking structures, which are spaced apart circumferentially along the inner wall of the receiving cavity.

[0010] Furthermore, the length of the second locking structure along the axial direction of the bellows body is equal to the length of the locking groove, and the arc length of the second locking structure along the circumferential direction of the bellows body is less than or equal to the arc length of two adjacent first locking structures in the circumferential direction of the bellows body.

[0011] Furthermore, the corrugated pipe body includes a first part, the outline of the inner sidewall of the first part is parallel to the axis of the accommodating cavity, and the first locking structure is disposed on the inner sidewall of the first part.

[0012] Furthermore, one end of the guide sleeve body is provided with a guide structure, which is pointed from the second locking structure in the direction of the guide structure, and the diameter of the cross-sectional profile of the guide structure gradually decreases.

[0013] Furthermore, a driving unit is provided on the other side of the guide sleeve body, the driving unit being used to drive the guide sleeve body and the second locking structure to rotate.

[0014] Furthermore, the driving part includes at least two driving holes spaced apart on the guide sleeve body.

[0015] Furthermore, the inner wall of the guide sleeve body is cylindrical, and the inner wall is used to connect with the conductive rod.

[0016] Another embodiment of this application provides a vacuum circuit breaker, including the vacuum interrupter chamber as described above.

[0017] As can be seen from the above technical solutions, the embodiments of this application have at least the following beneficial effects:

[0018] In the vacuum interrupter provided in this embodiment, a first locking structure is provided on the bellows body, and a second locking structure is provided on the outer periphery of the guide sleeve body. The guide sleeve body is disposed within the accommodating cavity of the bellows body, and the second locking structure is connected to the first locking structure. Thus, by connecting the second locking structure with the first locking structure, the axial movement of the guide sleeve body along the bellows body can be restricted, allowing the bellows body and the guide sleeve body to move synchronously in the axial direction of the bellows body. Simultaneously, the guide sleeve body, disposed within the accommodating cavity of the bellows body, is located between the conductive rod and the bellows body during operation, and can move synchronously with the bellows body. This ensures that the guide sleeve body remains within the high-risk area for columnar instability during operation, effectively preventing columnar instability of the bellows body under high-speed, high-impact, and high-load operating conditions. In addition, the guide sleeve body can move synchronously with the bellows body to avoid additional impact caused by the relative movement of the bellows body and the guide sleeve body. This reduces the possibility of damage to the bellows body under repeated impacts and compression from the guide sleeve body. It also reduces the possibility of the guide sleeve body getting stuck on a wave of the bellows body during the swinging process, which could damage the bellows body or cause it to scrape against the conductive rod. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the bellows structure in a vacuum interrupter provided in one embodiment of this application;

[0021] Figure 2 for Figure 1 A magnified view of part A in the middle;

[0022] Figure 3 This is a schematic diagram of the guide sleeve structure in a vacuum interrupter provided in one embodiment of this application;

[0023] Figure 4 This is a schematic diagram of the guide sleeve structure in a vacuum interrupter provided in one embodiment of this application from another perspective.

[0024] Figure label:

[0025] 110. Corrugated pipe body; 111. First part; 112. Corrugated groove; 120. First locking structure; 121. Locking protrusion; 123. Locking groove;

[0026] 210. Guide sleeve body; 212. Guide structure; 220. Second locking structure; 211. Through groove; 231. Drive hole. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] To prevent columnar instability in the bellows, a guide sleeve made of polytetrafluoroethylene (PTFE) is inserted between the guide sleeve and the conductive rod. Due to the material properties, the guide sleeve cannot be welded in the vacuum furnace along with the bellows and conductive rod. It must be manually inserted between the bellows and conductive rod after welding to prevent columnar instability during use. However, the guide sleeve is prone to relative displacement with the bellows during operation, causing it to deviate from the high-risk area for bellows instability and hindering the bellows' proper function. Furthermore, the bellows' high speed, significant impact, and thin wall make it susceptible to damage from repeated impacts and compression by the guide sleeve.

[0029] In view of this, embodiments of this application propose a vacuum interrupter and a vacuum circuit breaker to effectively solve the aforementioned problems.

[0030] See Figures 1 to 4 As shown, one embodiment of this application discloses a vacuum interrupter, including a bellows structure and a guide sleeve structure.

[0031] Specifically, the bellows structure includes a bellows body 110 and a first locking structure 120. The bellows body 110 has an internal accommodating cavity, and the first locking structure 120 is disposed on the cavity surface of the accommodating cavity. The guide sleeve structure includes a second locking structure 220 and a guide sleeve body 210. The second locking structure 220 is disposed on the outer peripheral wall of the guide sleeve body 210. The guide sleeve body 210 is at least partially disposed in the accommodating cavity, and the second locking structure 220 is engaged with the first locking structure 120 to restrict the axial movement of the guide sleeve body 210 along the bellows body 110.

[0032] In the vacuum interrupter provided in this embodiment, a first locking structure 120 is provided on the bellows body 110, and a second locking structure 220 is provided on the outer periphery of the guide sleeve body 210. The guide sleeve body 210 is disposed in the accommodating cavity of the bellows body 110, and the second locking structure 220 is connected to the first locking structure 120. In this way, the second locking structure 220 can be connected with the first locking structure 120 to restrict the axial movement of the guide sleeve body 210 along the bellows body 110, so that the bellows body 110 and the guide sleeve body 210 can maintain synchronous movement in the axial direction of the bellows body 110. At the same time, the guide sleeve body 210 is set in the accommodating cavity of the bellows body 110. During operation, the guide sleeve is located between the conductive rod and the bellows body 110, and the guide sleeve body 210 can maintain synchronous movement with the bellows body 110. During operation, the guide sleeve body 210 can be kept in the high-incidence area of ​​columnar instability, thereby effectively preventing columnar instability of the bellows body 110 under high-speed, high-impact, and high-load operating conditions. In addition, the guide sleeve body 210 can move synchronously with the bellows body 110, which can reduce the risk of the guide sleeve body 210 getting stuck on a wave of the bellows body 110 during the swinging process, thus preventing damage to the bellows body 110 or scratching with the conductive rod.

[0033] See Figure 1 and Figure 2 In some embodiments of this application, the first locking structure 120 includes two locking protrusions 121, which are spaced apart along the axial direction of the bellows body 110 on the cavity wall of the receiving cavity. A locking groove 123 is defined between the two locking protrusions 121. The second locking structure 220 is a protrusion and is disposed within the locking groove 123. During assembly, the guide sleeve body 210 is placed into the receiving cavity of the bellows body 110, while simultaneously positioning the second locking structure 220 and the locking groove 123 on the same circumference. At this time, the second locking structure 220 is misaligned with the locking protrusions 121. Then, the guide sleeve body 210 is rotated, causing the second locking structure 220 to rotate circumferentially in the bellows body 110. This allows the second locking structure 220 to rotate into the locking groove 123 defined by the two locking protrusions 121.

[0034] In the above embodiment, the bellows body 110 moves along its own axial direction during operation. Since the second locking structure 220 has locking protrusions 121 on both sides, the locking protrusions 121 on both sides of the second locking structure 220 can drive the second locking structure 220 to move synchronously when the bellows body 110 moves. The second locking structure 220, in turn, drives the guide sleeve body 210 to move synchronously with the bellows body 110. This allows the guide sleeve body 210 to always remain in the high-incidence area of ​​columnar instability of the bellows body 110, thereby effectively preventing columnar instability of the bellows body 110 and reducing lateral displacement of the bellows body 110 after columnar instability during movement, which is beneficial to extending the service life of the vacuum interrupter.

[0035] See Figure 1 and Figure 2 In some embodiments of this application, there are multiple first locking structures 120, which are spaced apart circumferentially along the inner wall of the accommodating cavity. This increases the uniformity of stress on the bellows body 110.

[0036] In one possible implementation, see Figure 3 and Figure 4 The outer wall of the guide sleeve body 210 is provided with multiple second locking structures 220. Specifically, each second locking structure 220 corresponds to a first locking structure 120. That is, each second locking structure 220 can be connected to its corresponding first locking structure 120. In this way, the bellows body 110 can be evenly stressed at all positions in the circumferential direction.

[0037] Furthermore, the first locking structures 120 are evenly spaced circumferentially within the accommodating cavity, meaning that the first locking structures 120 are evenly distributed along the inner circumference of the bellows body 110. This ensures that the guide sleeve body 210 and the bellows body 110 can be subjected to even forces under high-speed, high-impact, and high-load operating conditions.

[0038] In some embodiments of this application, the length of the second locking structure 220 along the axial direction of the bellows body 110 is equal to the length of the locking groove 123, and the arc length of the second locking structure 220 along the circumferential direction of the bellows body 110 is less than or equal to the arc length of two adjacent first locking structures 120 in the circumferential direction of the bellows body 110. This allows the second locking structure 220 to move smoothly into the locking groove 123, ensuring smooth assembly of the guide sleeve body 210 and the bellows body 110.

[0039] See Figures 1 to 4In some embodiments of this application, the bellows body 110 includes a first portion 111, the contour of the inner wall of the first portion 111 being parallel to the axis of the accommodating cavity, and a first locking structure 120 disposed on the inner wall of the first portion 111. That is, the first locking structure 120 is disposed on the straight section of the first portion 111. The first locking structure 120 includes two locking protrusions 121 spaced apart along the axial direction of the bellows body 110. The straight section of the first portion 111 facilitates the fixing of the locking protrusions 121 to the inner wall of the first portion 111. Furthermore, compared to the entire bellows body 110 being a corrugated structure, the straight section of the first portion 111 in this embodiment effectively improves the impact resistance of the bellows body 110 and helps extend its service life.

[0040] See Figure 3 In some embodiments of this application, a guide structure 212 is provided at one end of the guide sleeve body 210, with the second locking structure 220 pointing in the direction of the guide structure 212, and the diameter of the cross-sectional profile of the guide structure 212 gradually decreasing. The end of the guide sleeve body 210 with the guide structure 212 is used for insertion into the receiving cavity of the bellows body 110. The guide structure 212 facilitates the installation of the guide sleeve body 210 into the receiving cavity, reducing assembly difficulty.

[0041] In one possible implementation, the outer wall of the guide structure 212 is an inclined surface relative to the guide sleeve body 210, which can provide guidance for the guide sleeve body 210 to be inserted into the receiving cavity.

[0042] In some embodiments of this application, a driving part is provided on the other side of the guide sleeve body 210. The driving part is used to drive the guide sleeve body 210 and the second locking structure 220 to rotate. After the second locking structure 220 is aligned with the first locking structure 120, the guide sleeve body 210 can be driven to rotate by the driving part so that the second locking structure 220 rotates into the locking groove 123.

[0043] In one possible implementation, see Figure 3 and Figure 4 The drive unit includes at least two drive holes 231 spaced apart on the guide sleeve body 210. During assembly, the guide sleeve body 210 is precisely inserted into the designated area of ​​the receiving cavity using a tool. Then, the guide sleeve body 210 is rotated by the tool cooperating with the drive holes 231, so that the second locking structure 220 on the outer periphery of the guide sleeve body 210 fits into the locking groove 123, thereby ensuring that the guide sleeve body 210 and the bellows body 110 move synchronously and preventing columnar instability.

[0044] In some embodiments of this application, the inner wall of the guide sleeve body 210 is cylindrical, and the inner wall is used to connect with the conductive rod.

[0045] Another embodiment of this application discloses a vacuum circuit breaker, including the vacuum interrupter as described above, which has all the technical effects of the aforementioned vacuum interrupter, and will not be repeated here.

[0046] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0047] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0049] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0050] It should be understood that although the steps in the flowcharts of the accompanying drawings are shown in sequence as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some of the steps in the flowcharts of the accompanying drawings may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be executed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

Claims

1. A vacuum interrupter, characterized in that, include: A bellows structure includes a bellows body and a first locking structure. The bellows body has an internal accommodating cavity, and the first locking structure is disposed on the cavity surface of the accommodating cavity. The guide sleeve structure includes a second locking structure and a guide sleeve body. The second locking structure is disposed on the outer peripheral wall of the guide sleeve body and is located between the two ends of the guide sleeve body. The guide sleeve body is at least partially disposed within the receiving cavity, and the second locking structure cooperates with the first locking structure to restrict the axial movement of the guide sleeve body along the bellows body. During operation, the guide sleeve body is located between the conductive rod and the bellows body. The corrugated pipe body includes a first part and corrugated pipe sections located at both ends of the first part. The first part is a straight section, and the outline of the inner sidewall of the first part is parallel to the axis of the accommodating cavity. The first locking structure is provided on the inner sidewall of the first part. The inner wall of the guide sleeve body is cylindrical, and the inner wall is used to connect with the conductive rod.

2. The vacuum interrupter according to claim 1, characterized in that, The first locking structure includes two locking protrusions, which are spaced apart along the axial direction of the bellows body on the cavity wall of the receiving cavity. A locking groove is defined between the two locking protrusions. The second locking structure is a protrusion and is disposed within the locking groove.

3. The vacuum interrupter according to claim 2, characterized in that, The first locking structure has multiple first locking structures, which are spaced apart circumferentially along the inner wall of the receiving cavity.

4. The vacuum interrupter according to claim 3, characterized in that, The length of the second locking structure along the axial direction of the bellows body is equal to the length of the locking groove, and the arc length of the second locking structure along the circumferential direction of the bellows body is less than or equal to the arc length of two adjacent first locking structures along the circumferential direction of the bellows body.

5. The vacuum interrupter according to claim 1, characterized in that, One end of the guide sleeve body is provided with a guide structure, which is pointed from the second locking structure in the direction of the guide structure, and the diameter of the cross-sectional profile of the guide structure gradually decreases.

6. The vacuum interrupter according to claim 1, characterized in that, A driving part is provided on the other side of the guide sleeve body, and the driving part is used to drive the guide sleeve body and the second locking structure to rotate.

7. The vacuum interrupter according to claim 6, characterized in that, The driving part includes at least two driving holes spaced apart on the guide sleeve body.

8. A vacuum circuit breaker, characterized in that, Includes the vacuum interrupter as described in any one of claims 1 to 7.

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