Vacuum arc-extinguishing chamber

Abstract

The utility model provides a vacuum arc-extinguishing chamber, which comprises a shell, a movable end sealing ring, a movable conducting rod, a corrugated pipe and a transition connecting ring, the movable end sealing ring is sealed at the port of the shell, the movable conducting rod is arranged in a central hole of the movable end sealing ring in a penetrating manner, and the corrugated pipe is arranged in the shell and sleeves the periphery of the movable conducting rod; the transition connecting ring is arranged between the corrugated pipe and the movable end sealing ring and provided with a first side face facing the movable end sealing ring and a second side face facing the corrugated pipe. The first side face of the transition connecting ring is fixedly connected with the movable end sealing-in ring, a first protruding part matched in a center hole of the movable end sealing-in ring is arranged on the inner edge of the transition connecting ring in a protruding mode, the end of the corrugated pipe is fixedly connected with the second side face of the transition connecting ring, and a second protruding part is arranged on the outer edge of the second side face of the transition connecting ring in a protruding mode. And the second convex part is positioned on the outer side of the corrugated pipe to limit the corrugated pipe, so that the coaxiality of the corrugated pipe is better, and the assembly difficulty is effectively reduced.

Description

Technical Field

[0001] This utility model relates to a vacuum interrupter. Background Technology

[0002] The key component of a vacuum circuit breaker is the vacuum interrupter, which essentially determines the main performance of the vacuum circuit breaker. The basic structure of the vacuum interrupter consists of a pair of operable contacts enclosed in an insulating shell under vacuum conditions. The porcelain or glass shell serving as the shell not only ensures the vacuum level inside the interrupter and maintains sufficient mechanical strength, but also acts as a solid insulating component.

[0003] The moving end portion of the vacuum interrupter mainly includes a moving end sealing ring, a moving conductive rod, and a bellows. The moving end sealing ring is sealed at the port of the housing. The moving conductive rod passes through the central hole of the moving end sealing ring. The bellows is disposed inside the housing and sleeved around the outer periphery of the moving conductive rod. The bellows is fixedly connected to the moving end sealing ring. Currently, the bellows is generally fixed to the moving end sealing ring by brazing. The bellows and the moving end sealing ring are not easy to position, and poor positioning will lead to assembly difficulties. Utility Model Content

[0004] Therefore, to solve the above problems, this utility model provides a vacuum interrupter.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A vacuum interrupter includes a housing, a moving end sealing ring, a moving conductive rod, a bellows, and a transition connecting ring. The moving end sealing ring is sealed at the port of the housing. The moving conductive rod passes through the central hole of the moving end sealing ring. The bellows is disposed inside the housing and sleeved around the outer periphery of the moving conductive rod. The transition connecting ring is disposed between the bellows and the moving end sealing ring. The transition connecting ring has a first side facing the moving end sealing ring and a second side facing the bellows. The first side of the transition connecting ring is fixedly connected to the moving end sealing ring and has a first protrusion protruding along its inner edge that fits into the central hole of the moving end sealing ring. The end of the bellows is fixedly connected to the second side of the transition connecting ring, and the outer edge of the second side of the transition connecting ring has a second protrusion protruding. The second protrusion is located outside the bellows to restrict the bellows.

[0007] Furthermore, the first protrusion is a closed annular protrusion; and / or, the second protrusion is a closed annular protrusion.

[0008] Furthermore, the transition connecting ring is made of copper, and the first side of the transition connecting ring is fixed to the moving end sealing ring by oxygen-free copper brazing, and the end of the bellows is fixed to the second side of the transition connecting ring by oxygen-free copper brazing.

[0009] Furthermore, both the moving end sealing ring and the bellows are made of stainless steel.

[0010] Furthermore, the end of the bellows connected to the transition connecting ring is a first cylindrical end extending along its axial direction, and the bellows abuts against and is fixed to the second side of the transition connecting ring through the first cylindrical end.

[0011] Furthermore, the moving conductive rod also has a wave shield, and the other end of the bellows is fixedly connected to the wave shield.

[0012] Furthermore, the outer edge of the bellows cover has a third protrusion, which is located outside the bellows to restrict the bellows.

[0013] Furthermore, the end of the corrugated pipe connected to the wave shield is a second cylindrical end extending along its axial direction, and the corrugated pipe abuts against and is fixed to the wave shield through the second cylindrical end.

[0014] Furthermore, the wave shield is a plate-type circular ring structure with a mounting hole in its middle. The wave shield is sleeved on the moving conductive rod through the mounting hole and forms a fixed connection with the moving conductive rod.

[0015] Furthermore, a guide sleeve is fitted inside the central hole of the moving end sealing ring, and the moving conductive rod is fitted inside the guide sleeve.

[0016] Furthermore, it also includes a stationary conductive rod, a stationary end sealing ring, and a shielding cylinder. The housing is a cylindrical housing. The moving end sealing ring and the stationary end sealing ring are respectively sealed at the two end openings of the housing. The stationary conductive rod is fixed on the stationary end sealing ring. The moving conductive rod is equipped with a moving contact, and the stationary conductive rod is equipped with a stationary contact. The moving contact and the stationary contact correspond to form a contact system. The shielding cylinder is disposed on the outer periphery of the contact system.

[0017] Furthermore, both ends of the housing are fitted with end covers, and the shielding cylinder extends into the inside of the end cover located at the stationary end.

[0018] The technical solution provided by this utility model has the following beneficial effects:

[0019] 1. The first side of the transition connecting ring is fixedly connected to the moving end sealing ring, and a first protrusion protrudes along its inner edge, which engages with the central hole of the moving end sealing ring. During assembly, the transition connecting ring can be positioned and installed by engaging the first protrusion with the central hole of the moving end sealing ring. The outer edge of the second side of the transition connecting ring has a second protrusion, which is located outside the bellows to restrict the bellows. That is, the end of the bellows engages with the inner side of the second protrusion to position and install the bellows, thereby improving the coaxiality of the bellows and effectively reducing the assembly difficulty.

[0020] 2. The transition connecting ring is made of copper. The first side of the transition connecting ring is fixed to the moving end sealing ring by oxygen-free copper brazing, and the end of the bellows is fixed to the second side of the transition connecting ring by oxygen-free copper brazing; this improves the brazing quality and increases reliability.

[0021] 3. The end of the bellows connected to the transition connecting ring is a first cylindrical end extending along its axial direction, and the bellows abuts against and is fixed to the second side of the transition connecting ring through the first cylindrical end; and / or the end of the bellows connected to the wave shield is a second cylindrical end extending along its axial direction, and the bellows abuts against and is fixed to the wave shield through the second cylindrical end; the utilization rate of the bellows is increased, and the mechanical life is increased. Attached Figure Description

[0022] Figure 1 The figure shown is a cross-sectional view of the vacuum interrupter in the embodiment;

[0023] Figure 2 As shown Figure 1 Enlarged view of region A in the middle;

[0024] Figure 3 As shown Figure 1 Enlarged view of region B in the middle;

[0025] Figure 4 The figure shown is a three-dimensional schematic diagram of the transition connecting ring in the embodiment. Figure 1 ;

[0026] Figure 5 The figure shown is a three-dimensional schematic diagram of the transition connecting ring in the embodiment. Figure 2 ;

[0027] Figure 6 The figure shown is a cross-sectional view of the transition connecting ring in the embodiment. Detailed Implementation

[0028] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0029] In the description of this invention, terms such as "upper," "lower," "left," "right," "front," and "rear," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this invention.

[0030] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0031] Reference Figures 1 to 3 As shown, this embodiment provides a vacuum interrupter, including a shell 11, a moving end sealing ring 21, a moving conductive rod 23, a bellows 30, a stationary conductive rod 52, a stationary end sealing ring 51, and a shielding cylinder 60. The shell 11 is a cylindrical shell. The moving end sealing ring 21 and the stationary end sealing ring 51 are respectively sealed at the upper and lower openings of the shell 11. The moving conductive rod 23 passes through the central hole 211 of the moving end sealing ring 21. Specifically, a guide sleeve 22 is installed in the central hole 211 of the moving end sealing ring 21, and the moving conductive rod 23 is installed in the guide sleeve 22 to guide the movement of the moving conductive rod 23. The stationary conductive rod 52 is fixed on the stationary end sealing ring 51. The moving conductive rod 23 is equipped with a moving contact 25, and the stationary conductive rod 52 is equipped with a stationary contact 53. The moving contact 25 and the stationary contact 53 correspond to each other to form a contact system. The shielding cylinder 60 is disposed on the outer periphery of the contact system, that is, on the outer periphery of the moving contact 25 and the stationary contact 53. In this way, the contact system of the vacuum interrupter is set up.

[0032] This also includes a transition connecting ring 40, which continues to be referenced. Figures 4 to 6 As shown, the transition connecting ring 40 is disposed between the bellows 30 and the moving end sealing ring 21. The transition connecting ring 40 has a first side 41 facing the moving end sealing ring 21 and a second side 42 facing the bellows 30, with the first side 41 and the second side 42 arranged opposite to each other. The first side 41 of the transition connecting ring 40 is fixedly connected to the moving end sealing ring 21 and has a first protrusion 43 protruding along its inner edge, which fits into the central hole 211 of the moving end sealing ring 21. During assembly, the positioning and installation of the transition connecting ring 21 can be achieved through the cooperation of the first protrusion 43 with the central hole 211 of the moving end sealing ring 21. The end of the bellows 30 (defined as the first end) Figure 1The second side 42 of the transition connecting ring 40 is fixedly connected to the upper end, and a second protrusion 44 protrudes from the outer edge of the second side 42 of the transition connecting ring 40. The second protrusion 44 is located outside the bellows 30 to restrict the bellows 30. That is, the first end of the bellows 30 is fitted inside the second protrusion 44 to achieve the positioning and installation of the bellows 30. In this way, the coaxiality of the bellows 30 is better, and the assembly difficulty is effectively reduced. Specifically, in this embodiment, the inner edge of the first side 41 of the transition connecting ring 40 protrudes to a first protrusion 43 and the outer edge of the second side 42 protrudes to a second protrusion 44, so that the cross-section of the transition connecting ring 40 has a "Z"-shaped structure. Of course, in other embodiments, it is not limited to this "Z"-shaped structure.

[0033] Specifically, in this embodiment, referring to Figure 4 and Figure 5 As shown, both the first protrusion 43 and the second protrusion 44 are closed annular protrusions, i.e., convex ring structures. This configuration makes them easier to form and manufacture during processing. Of course, in other embodiments, the first protrusion 43 and / or the second protrusion 44 can also adopt other protrusion structures. For example, the first protrusion 43 and / or the second protrusion 44 can also be multiple boss structures. Multiple bosses are spaced along an annular interval to jointly achieve limiting. For example, the multiple bosses constituting the first protrusion 43 are jointly limited within the central hole 211 of the moving end sealing ring 21, and the multiple bosses constituting the second protrusion 44 are jointly limited around the first end of the bellows 30; and so on.

[0034] In this embodiment, both the moving end sealing ring 21 and the bellows 30 are made of stainless steel. Furthermore, the transition connecting ring 40 is made of copper. The first side 41 of the transition connecting ring 40 is fixed to the moving end sealing ring 21 by oxygen-free copper brazing, and the end of the bellows 30 is fixed to the second side 42 of the transition connecting ring 40 by oxygen-free copper brazing. The copper transition connecting ring 40 is welded to both the stainless steel moving end sealing ring 21 and the bellows 30, improving brazing quality and increasing reliability.

[0035] The end (i.e. the first end) where the corrugated pipe 30 connects to the transition connecting ring 40 is a first cylindrical end 31 extending along its axial direction. The corrugated pipe 30 abuts against and is fixed to the second side surface 42 of the transition connecting ring 40 through the first cylindrical end 31, so that the corrugated pipe 30 and the transition connecting ring 40 form a small-area brazed connection. In this way, the corrugated length of the corrugated pipe 30 is not sacrificed, and the problem of easy breakage of the corrugated pipe 30 due to welding stress concentration is avoided. This further improves the welding stability, increases the utilization rate of the corrugated pipe 30, and increases the mechanical life.

[0036] The movable conductive rod 23 also has a wave shield 24, and the other end of the bellows 30 (defined as the second end) Figure 1 The lower end of the bellows 30 is fixedly connected to the bellows cover 24. Specifically, the outer edge of the bellows cover 24 has a third protrusion 241, which is located outside the bellows 30 to restrict the bellows 30, thus effectively positioning the second end of the bellows 30. Simultaneously, similar to the first end of the bellows 30, the second end of the bellows 30 is a second cylindrical end 32 extending along its axial direction. The bellows 30 abuts against and is fixed to the bellows cover 24 through the second cylindrical end 32. Specifically, the second cylindrical end 32 of the bellows 30 is also fixed to the bellows cover 24 by brazing. This creates a small-area brazed connection between the bellows 30 and the bellows cover 24, thus not sacrificing the corrugated length of the bellows 30 and avoiding the problem of stress concentration during welding leading to easy breakage of the bellows 30. This further improves welding stability, increases the utilization rate of the bellows 30, and extends its mechanical life.

[0037] Specifically, the third protrusion 241 is also a closed annular protrusion, which is convenient for processing and preparation. Of course, in other embodiments, the third protrusion 241 may also be composed of multiple protrusions distributed in an annular shape.

[0038] The wave shield 24 is configured as a plate-type circular ring structure with a mounting hole in its center. The wave shield 24 is sleeved onto the movable conductive rod 23 through the mounting hole and forms a fixed connection with the movable conductive rod 23. In this embodiment, the movable conductive rod 23 is provided with an abutment step 231. The wave shield 24 is sleeved onto the movable conductive rod 23 through the mounting hole and abuts against the abutment step 231 for positioning. The wave shield 24 and the movable conductive rod 23 are fixed by brazing. Of course, in other embodiments, the wave shield 24 can also be integrally connected to the movable conductive rod 23.

[0039] Both ends of the housing 11 are also fitted with end covers 12, and the moving end sealing ring 21 and the stationary end sealing ring 51 are both welded and fixed to the housing 11 through the corresponding end covers 12. One end of the shielding cylinder 60 also extends into the end cover 12 located at the stationary end (i.e., Figure 1 The inner side of the lower end cap 12) provides better protection against metal vapor.

[0040] The above discloses one preferred embodiment of this application. Of course, it is not limited to this in other embodiments. For example, the moving end sealing ring 21 can be directly formed into a guide sleeve 22 for guiding the moving conductive rod 23. Alternatively, the material of the moving end sealing ring 21 and / or the bellows 30 is not limited to the stainless steel material mentioned above, and the material of the transition connecting ring 40 is not limited to the copper material mentioned above. The stationary end part of the vacuum interrupter (i.e., the mounting structure of the stationary conductive rod 52) can also be implemented using other structures, and so on.

[0041] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A vacuum interrupter, comprising a shell, a moving end sealing ring, a moving conductive rod, and a bellows, wherein the moving end sealing ring is sealed at the port of the shell, the moving conductive rod passes through the central hole of the moving end sealing ring, and the bellows is disposed inside the shell and sleeved around the outer periphery of the moving conductive rod; characterized in that: It also includes a transition connecting ring disposed between the bellows and the moving end sealing ring. The transition connecting ring has a first side facing the moving end sealing ring and a second side facing the bellows. The first side of the transition connecting ring is fixedly connected to the moving end sealing ring and has a first protrusion protruding along its inner edge that fits into the central hole of the moving end sealing ring. The end of the bellows is fixedly connected to the second side of the transition connecting ring, and the outer edge of the second side of the transition connecting ring has a second protrusion protruding. The second protrusion is located outside the bellows to restrict the bellows.

2. The vacuum interrupter according to claim 1, characterized in that: The first protrusion is a closed annular protrusion; and / or, the second protrusion is a closed annular protrusion.

3. The vacuum interrupter according to claim 1, characterized in that: The transition connecting ring is made of copper. The first side of the transition connecting ring is fixed to the moving end sealing ring by oxygen-free copper brazing, and the end of the bellows is fixed to the second side of the transition connecting ring by oxygen-free copper brazing.

4. The vacuum interrupter according to claim 3, characterized in that: Both the moving end sealing ring and the bellows are made of stainless steel.

5. The vacuum interrupter according to claim 1, characterized in that: The end of the bellows connected to the transition connecting ring is a first cylindrical end extending along its axial direction. The bellows abuts against and is fixed to the second side of the transition connecting ring through the first cylindrical end.

6. The vacuum interrupter according to claim 1, characterized in that: The moving conductive rod also has a wave shield, and the other end of the bellows is fixedly connected to the wave shield; the outer edge of the wave shield has a third protrusion, which is located outside the bellows to restrict the bellows.

7. The vacuum interrupter according to claim 6, characterized in that: The end of the corrugated pipe that connects to the wave shield is a second cylindrical end that extends along its axial direction. The corrugated pipe abuts against and is fixed to the wave shield through the second cylindrical end.

8. The vacuum interrupter according to claim 6, characterized in that: The wave shield is a plate-type circular structure with a mounting hole in its middle. The wave shield is sleeved on the moving conductive rod through the mounting hole and forms a fixed connection with the moving conductive rod.

9. The vacuum interrupter according to claim 1, characterized in that: It also includes a stationary conductive rod, a stationary end sealing ring, and a shielding cylinder. The housing is a cylindrical housing. The moving end sealing ring and the stationary end sealing ring are respectively sealed at the two end openings of the housing. The stationary conductive rod is fixed on the stationary end sealing ring. The moving conductive rod is equipped with a moving contact, and the stationary conductive rod is equipped with a stationary contact. The moving contact and the stationary contact correspond to each other to form a contact system. The shielding cylinder is disposed on the outer periphery of the contact system.

10. The vacuum interrupter according to claim 9, characterized in that: Both ends of the housing are also fitted with end covers, and one end of the shielding cylinder extends into the inside of the end cover located at the stationary end.

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