Vacuum Interrupter and Vacuum Circuit Breaker

Abstract

The vacuum interrupter and the vacuum circuit breaker provided by the present application relate to the technical field of vacuum circuit breakers. Among them, the vacuum interrupter includes: a porcelain shell and a moving end cover plate connected to one end of the porcelain shell; a moving contact rod, one end of which passes through the moving end cover plate and is partially disposed inside the porcelain shell; and a shielding assembly, including a moving support, a shielding cover and an elastic mechanism. The moving support is disposed on one side of the moving end cover plate, the shielding cover is disposed between the moving support and the moving end cover plate, and the shielding cover abuts against the moving end cover plate. The elastic mechanism is disposed between the moving support and the shielding cover, and the elastic mechanism is used to push the shielding cover to move toward the side of the moving end cover plate, so that the shielding cover abuts against the moving end cover plate. In the embodiments of the present application, the provided vacuum interrupter and vacuum circuit breaker can effectively ensure the stability of the relative position between the shielding cover and the moving end cover plate, reduce the influence of the porcelain shell height tolerance on the shielding effect of the shielding cover, and is conducive to ensuring the shielding effect of the shielding cover.

Description

Technical Field

[0001] The present application relates to the technical field of vacuum circuit breakers, and in particular, to a vacuum interrupter and a vacuum circuit breaker. Background Art

[0002] As an opening unit that uses vacuum as the arc extinguishing medium and the insulating medium for the contact gap after arc extinguishing, the vacuum interrupter does not contain SF6 gas and has the advantages of small volume, light weight, environmental friendliness, and no need for maintenance. It is gradually being promoted from the medium-voltage distribution level to the high-voltage transmission level.

[0003] Among them, the vacuum interrupter uses the internal moving and static contact rods as the main current-carrying circuit; the porcelain shell is used as the outer shell of the vacuum interrupter, which has certain strength and insulation performance, and also acts as a kind of voltage equalizing capacitor. However, as the voltage level increases, the diameter of the vacuum interrupter becomes larger, that is, the diameter of the porcelain shell also becomes larger. The processing difficulty of the porcelain shell is relatively high, and it is difficult to control the accuracy so high. The larger the diameter of the porcelain shell, the greater the tolerance in the height direction. Exemplarily, the tolerance of the porcelain shell in the height direction can reach ±3 mm. The size accuracy of the moving end cover plate is relatively high. Since the end of the porcelain shell needs to be welded to the end cover plate, a layer of adhesive layer that is easy to weld is usually provided at the end of the porcelain shell, which easily causes more burrs at the end of the porcelain shell after welding with the end cover plate, and the surface quality is very poor. In order to ensure the external insulation performance, a shielding structure is usually provided at the end of the porcelain shell. Therefore, when the height tolerance of the porcelain shell is relatively large, the tolerance of the height difference H between the moving end shield and the end of the porcelain shell is usually ±3 mm, which will seriously affect the shielding effect of the end shield on the end face of the porcelain shell. Summary of the Invention

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. For this purpose, the present application provides a vacuum interrupter and a vacuum circuit breaker, which can reduce the tolerance range of the height difference between the moving support shield and the end face of the porcelain shell, and is beneficial to ensuring the shielding effect.

[0005] An embodiment of one aspect of the present application provides a vacuum interrupter, including:

[0006] A porcelain shell and a moving end cover plate connected to one end of the porcelain shell;

[0007] A moving contact rod, one end of which passes through the moving end cover plate and is partially disposed inside the porcelain shell; and

[0008] A shielding assembly, including a moving support, a shielding cover, and an elastic mechanism. The moving support is disposed on one side of the moving end cover plate. The shielding cover is disposed between the moving support and the moving end cover plate, and the shielding cover abuts against the moving end cover plate. The elastic mechanism is disposed between the moving support and the shielding cover, and the elastic mechanism is used to push the shielding cover to move toward the moving end cover plate side, so that the shielding cover abuts against the moving end cover plate.

[0009] For a vacuum interrupter according to some embodiments of the present application, the elastic mechanism includes at least one elastic member, one end of the elastic member abuts against the moving support, and the other end of the elastic member abuts against the shielding cover.

[0010] For a vacuum interrupter according to some embodiments of the present application, there are a plurality of the elastic members, and the plurality of elastic members are evenly spaced around the outer periphery of the moving contact rod.

[0011] For a vacuum interrupter according to some embodiments of the present application, the shielding cover includes a base portion and a wing portion, the base portion abuts against the moving end cover plate, one end of the wing portion is connected to the base portion, and the other end of the wing portion extends along the length direction of the porcelain shell.

[0012] For a vacuum interrupter according to some embodiments of the present application, along the length direction of the porcelain shell, the distance between the end of the wing portion away from the base portion and the end of the porcelain shell close to the moving end cover plate is H, and H>0.

[0013] For a vacuum interrupter according to some embodiments of the present application, a first positioning structure is provided on the side of the base portion close to the shielding cover, and at least a part of the elastic member is arranged in the first positioning structure.

[0014] For a vacuum interrupter according to some embodiments of the present application, a second positioning structure is provided on the side of the moving support close to the moving end cover plate, and at least a part of the elastic member is arranged in the second positioning structure.

[0015] For a vacuum interrupter according to some embodiments of the present application, it further includes a guide sleeve, the guide sleeve is arranged on the moving support, and the moving contact rod is slidably connected to the guide sleeve.

[0016] For a vacuum interrupter according to some embodiments of the present application, the shielding cover is a thin-walled and lightweight part.

[0017] A circuit breaker according to another embodiment of the present application includes the vacuum interrupter as described above.

[0018] As can be seen from the above technical solutions, the embodiments of the present application at least have the following beneficial effects:

[0019] In the vacuum interrupter and the vacuum circuit breaker provided by the present application, a shielding cover is provided between the moving support and the moving end cover plate, and an elastic mechanism is provided between the shielding cover and the moving support. The elastic mechanism is used to push the shielding cover to move towards the side of the moving end cover plate so that the shielding cover can always abut against the moving end cover plate. In this way, the relative position between the shielding cover and the moving end cover plate can be effectively guaranteed to be stable, the influence of the height tolerance of the porcelain shell on the shielding effect of the shielding cover is reduced, and it is beneficial to ensure the shielding effect of the shielding cover. Description of the Drawings

[0020] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0021] Figure 1 It is a partial structural schematic diagram of a vacuum interrupter provided by an embodiment of the present application;

[0022] Figure 2 For Figure 1 It is a partial enlarged structural schematic diagram of part A therein;

[0023] Figure 3 It is a dimensional schematic diagram of the wing part of the shielding cover and the end part of the porcelain shell in an embodiment of the present application.

[0024] Reference numerals:

[0025] 110, porcelain shell; 120, moving end cover plate;

[0026] 200, moving contact rod;

[0027] 310, moving support; 311, second positioning structure; 320, shielding cover; 321, base; 322, wing part; 3211, first positioning structure; 331, elastic member;

[0028] 410, static support; 420, static contact rod. Detailed implementation manners

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0030] In the conventional structure, the moving support shield and the moving support are an integral structure, and its positioning in the GIS circuit breaker depends on the position of the outgoing conductor at the butting part for positioning. Even if they are two separate parts, usually the shielding cover is a fixed structure and cannot move its position at any time. Therefore, there will be a situation where the value of the height difference H becomes larger due to the relatively large tolerance of the porcelain shell, thus affecting the shielding effect of the moving support shield.

[0031] In view of this, the embodiments of the present application propose a vacuum interrupter to effectively solve the foregoing problems.

[0032] See Figure 1As shown, in one aspect of the embodiments of the present application, a vacuum interrupter is disclosed. The vacuum interrupter includes a porcelain shell 110, a moving end cover plate 120, a moving contact rod 200, and a shielding assembly.

[0033] Specifically, the porcelain shell 110 has a hollow structure, and the moving end cover plate 120 is connected to one end of the porcelain shell 110; one end of the moving contact rod 200 passes through the moving end cover plate 120 and is partially disposed inside the porcelain shell 110; and the shielding assembly includes a moving support 310, a shielding cover 320, and an elastic mechanism. The moving support 310 is disposed on one side of the moving end cover plate 120, the shielding cover 320 is disposed between the moving support 310 and the moving end cover plate 120, and the shielding cover 320 abuts against the moving end cover plate 120. The elastic mechanism is disposed between the moving support 310 and the shielding cover 320, and the elastic mechanism is used to push the shielding cover 320 to move toward the moving end cover plate 120 side, so that the shielding cover 320 abuts against the moving end cover plate 120.

[0034] In this embodiment, the vacuum interrupter includes a static support 410 and a static contact rod 420. The static contact rod 420 is also partially disposed inside the porcelain shell 110, and the static support 410 is disposed at one end of the porcelain shell 110 away from the moving support 310.

[0035] In the vacuum interrupter and the vacuum circuit breaker provided by the present application, a shielding cover 320 is disposed between the moving support 310 and the moving end cover plate 120, and an elastic mechanism is disposed between the shielding cover 320 and the moving support 310. The elastic mechanism is used to push the shielding cover 320 to move toward the moving end cover plate 120 side, so that the shielding cover 320 can always abut against the moving end cover plate 120. In this way, the relative position between the shielding cover 320 and the moving end cover plate 120 can be effectively guaranteed to be stable, the influence of the height tolerance of the porcelain shell 110 on the shielding effect of the shielding cover 320 is reduced, and it is beneficial to ensure the shielding effect of the shielding cover 320.

[0036] See Figure 1 and Figure 2 As shown, in some embodiments of the present application, the elastic mechanism includes at least one elastic member 331. One end of the elastic member 331 abuts against the moving support 310, and the other end of the elastic member 331 abuts against the shielding cover 320. After assembly, the elastic member 331 is in a compressed state. In this way, the elastic member 331 can provide an elastic acting force for the shielding cover 320, so that the shielding cover 320 can always abut against the moving end cover plate 120 to ensure the shielding effect.

[0037] Please continue to see Figure 1 and Figure 2As shown, in some embodiments of the present application, there are multiple elastic members 331, and the multiple elastic members 331 are evenly spaced around the outer periphery of the moving contact rod 200. In this way, the shielding cover 320 can be uniformly stressed, so that the shielding cover 320 can maintain a stable relative position with the moving end cover plate 120 at each position in the circumferential direction, which is beneficial to ensuring the shielding effect of the shielding cover 320.

[0038] It should be noted that in the embodiments of the present application, the acting force of all the elastic members 331 on the shielding cover 320 should be greater than the gravity of the shielding cover 320 to ensure that the shielding cover 320 can always be in contact with the moving end cover plate 120 under the action of the elastic mechanism.

[0039] In practical applications, the elastic member 331 can specifically be a spring. Of course, the elastic member 331 can also be replaced with other elastic structures that can provide elastic acting force for the shielding cover 320.

[0040] In some embodiments of the present application, see Figure 1 and Figure 2 , the shielding cover 320 includes a base portion 321 and a wing portion 322. The base portion 321 is in contact with the moving end cover plate 120. One end of the wing portion 322 is connected to the base portion 321, and the other end of the wing portion 322 extends along the length direction of the porcelain shell 110. Among them, Figure 1 the X direction in

[0041] is the length direction of the porcelain shell 110.

[0042] In some embodiments of the present application, see Figure 3 , along the length direction of the porcelain shell 110, the distance between the end of the wing portion 322 away from the base portion 321 and the end of the porcelain shell 110 close to the moving end cover plate 120 is H, and H>0. Specifically, the length of the wing portion 322 in the length direction of the porcelain shell 110 is greater than the distance between the end of the porcelain shell 110 and the base portion 321. That is to say, part of the porcelain shell 110 is located in the shielding cavity surrounded by the wing portion 322. In this way, it is beneficial to ensure the shielding effect.

[0043] In some embodiments of the present application, see Figure 2 , a first positioning structure 3211 is provided on the side of the base portion 321 close to the shielding cover 320, and at least part of the elastic member 331 is arranged in the first positioning structure 3211. Specifically, the first positioning structure 3211 has a first positioning groove, and part of the elastic member 331 is arranged in the first positioning groove. In this way, the situation that the relative position between the shielding cover 320 and the porcelain shell 110 changes due to the offset of the elastic member 331 and then affects the shielding effect can be avoided.

[0044] In some embodiments of the present application, see Figure 2, on one side of the movable support 310 close to the movable end cover plate 120, a second positioning structure 311 is provided, and the elastic member 331 is at least partially disposed within the second positioning structure 311. Specifically, the second positioning structure 311 has a second positioning groove, and the elastic member 331 is partially disposed within the second positioning groove. In this way, the situation where the relative position between the shielding cover 320 and the porcelain shell 110 changes due to the offset of the elastic member 331, thereby affecting the shielding effect, can be avoided.

[0045] In some embodiments of the present application, for the porcelain, refer to Figure 1 and Figure 2 , the vacuum interrupter further includes a guide sleeve, the guide sleeve is disposed on the movable support 310, and the movable contact rod 200 is slidably connected to the guide sleeve.

[0046] In some embodiments of the present application, the shielding cover 320 is a thin-walled and lightweight part. In this way, it is convenient for the elastic mechanism to push the shielding cover 320 to always abut against the movable end cover plate 120.

[0047] Exemplarily, the shielding cover 320 is made of a lightweight metal, and the lightweight metal can specifically be aluminum.

[0048] Furthermore, the thin wall means that the thickness of the shielding cover 320 is small. In this way, the weight of the shielding cover 320 can be reduced. Exemplarily, the thickness of the shielding cover 320 can be set to 2 mm. In this way, it not only ensures that the shielding cover 320 has a small thickness, but also facilitates the manufacture of the shielding cover 320.

[0049] Another embodiment of the present application discloses a circuit breaker, including the vacuum interrupter as described above, having all the technical effects of the aforementioned vacuum interrupter, which will not be elaborated herein.

[0050] Next, a specific embodiment is used to describe in detail the vacuum interrupter and the vacuum circuit breaker of the embodiments of the present application. It should be noted that the following embodiments are only for exemplary description and should not be construed as a limitation to the embodiments of the present application.

[0051] Refer to Figures 1 to 3 As shown, in this embodiment, the movable support 310 and the shielding cover 320 are separated into two separate parts, and the shielding cover 320 is not fixed, but is supported by the elastic force of one or more small return springs. The return springs are always in a compressed state, so that the shielding cover 320 is always in contact with and positioned against the movable end cover plate 120, and the height difference H between the end of the shielding cover 320 and the end of the porcelain shell 110 can be accurately ensured. Among them, the elastic force design of the return spring needs to consider the gravity of the shielding cover 320. Therefore, in order to minimize the mass and reduce the cost as much as possible, the wall thickness of the shielding cover 320 should be as small as possible and the mass should be as light as possible, that is, the shielding cover 320 is a thin-walled and lightweight part.

[0052] When the height of the ceramic shell 110 is on the high side, the reset spring will be further pressed, and its elastic force will increase. It will firmly support the shielding cover 320, making it in reliable contact and stop with the moving-end cover plate 120. When the height of the ceramic shell 110 is on the low side, the reset spring is originally in a compressed state, and its elastic force is greater than the gravity of the shielding of the moving support 310. Under the action of the elastic force of the reset spring, it will push the shielding cover 320 upward to move, making it in reliable contact and stop with the moving-end cover plate 120. Therefore, the normal installation position of the reset spring is always in a compressed state. It is necessary to ensure that its elastic force is greater than the gravity of the shielding cover 320 and the energy of the reset spring can make the shielding of the moving support 310 continue to move upward by a displacement greater than 3 mm.

[0053] Among them, the reset spring can include multiple groups of small springs or can be a single large spring, as long as its elastic force can make the shielding of the moving support 310 move within a range of 3 mm up and down after overcoming the weight of the shielding of the moving support 310.

[0054] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 to the present application.

[0055] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0056] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0057] In the description of this specification, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0058] It should be understood that although the steps in the flowchart of the accompanying drawings are shown sequentially in the direction of the arrows, these steps are not necessarily executed sequentially in the order indicated by the arrows. Unless there is a clear indication in this document, there is no strict order restriction for the execution of these steps, and they can be executed in other orders. Moreover, at least a part of the steps in the flowchart of the accompanying drawings may include multiple sub-steps or multiple stages. 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 alternately or in turn with at least a part of other steps or sub-steps or stages of other steps.

Claims

1. A vacuum interrupter, characterized in that, Comprising: A porcelain shell and a moving end cover plate connected to one end of the porcelain shell; A moving contact rod, one end of which passes through the moving end cover plate and is partially disposed within the porcelain shell; And A shielding assembly, including a moving support, a shielding cover and an elastic mechanism. The moving support is disposed on one side of the moving end cover plate. The shielding cover is disposed between the moving support and the moving end cover plate, and the shielding cover abuts against the moving end cover plate. The elastic mechanism is disposed between the moving support and the shielding cover, and the elastic mechanism is used to push the shielding cover to move towards the moving end cover plate side so that the shielding cover abuts against the moving end cover plate; The elastic mechanism includes at least one elastic member. One end of the elastic member abuts against the moving support, and the other end of the elastic member abuts against the shielding cover. The elastic member is in a compressed state.

2. The vacuum interrupter according to claim 1, characterized in that, There are a plurality of the elastic members, and the plurality of elastic members are evenly spaced around the outer periphery of the moving contact rod.

3. The vacuum interrupter according to claim 1 or 2, characterized in that, The shielding cover includes a base portion and a wing portion. The base portion abuts against the moving end cover plate. One end of the wing portion is connected to the base portion, and the other end of the wing portion extends along the length direction of the porcelain shell.

4. The vacuum interrupter according to claim 3, wherein, Along the length direction of the porcelain shell, the distance between the end of the wing portion away from the base portion and the end of the porcelain shell close to the moving end cover plate is H, and H>0.

5. The vacuum interrupter according to claim 3, wherein, A first positioning structure is provided on the side of the base portion close to the shielding cover, and at least part of the elastic member is disposed within the first positioning structure.

6. The vacuum interrupter according to claim 5, characterized in that, A second positioning structure is provided on the side of the moving support close to the moving end cover plate, and at least part of the elastic member is disposed within the second positioning structure.

7. The vacuum interrupter according to claim 1, characterized in that, It further includes a guide sleeve. The guide sleeve is disposed on the moving support, and the moving contact rod is slidably connected to the guide sleeve.

8. A circuit breaker, characterized in that, Comprising the vacuum interrupter according to any one of claims 1 to 7.

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