Vacuum arc-extinguishing chamber and vacuum circuit breaker

Abstract

The invention provides a vacuum arc-extinguishing chamber and a vacuum circuit breaker, and relates to the technical field of vacuum circuit breakers, and the vacuum arc-extinguishing chamber comprises a porcelain shell and a movable end cover plate connected to one end of the porcelain shell; one end of the moving contact rod penetrates through the moving end cover plate and is partially arranged in the porcelain shell; the shielding assembly comprises a movable support, a shielding case and an elastic mechanism, the movable support is arranged on one side of the movable end cover plate, the shielding case is arranged between the movable support and the movable end cover plate and abuts against the movable end cover plate, and the elastic mechanism is arranged between the movable support and the shielding case and used for pushing the shielding case to move towards one side of the movable end cover plate; therefore, the shielding case is abutted against the movable end cover plate. According to the vacuum arc-extinguishing chamber and the vacuum circuit breaker provided by the embodiment of the invention, the stability of the relative position between the shielding case and the movable end cover plate can be effectively ensured, the influence of the height tolerance of the porcelain shell on the shielding effect of the shielding case is reduced, and the shielding effect of the shielding case is ensured.

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 a breaking unit that uses vacuum as the arc extinguishing medium and the insulating medium of the contact gap after arc extinguishing, the vacuum interrupter does not contain SF6 gas and has the advantages of small size, 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 arc chamber uses the internal moving and static contact rods as the main current circuit; the porcelain shell, as the outer shell of the vacuum arc chamber, has certain strength and insulation performance, and is also equivalent to a voltage-equalizing capacitor. However, with the increase of voltage level, the diameter of the vacuum arc chamber becomes larger and larger, that is, the diameter of the porcelain shell also becomes larger and larger. The porcelain shell is difficult to process, and the precision is difficult to control so high. The larger the diameter of the porcelain shell, the greater the tolerance in the height direction. For example, the tolerance of the porcelain shell in the height direction can reach ±3mm. The dimensional accuracy of the moving end cover plate is relatively high. Because the end of the porcelain shell needs to be welded with 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 leads to more burrs on 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, it is usually necessary to provide a shielding structure at the end of the porcelain shell. Therefore, when the height tolerance of the porcelain shell is large, the tolerance of the height difference H between the moving end shield and the end of the porcelain shell is usually ±3mm, 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 solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a vacuum interrupter and a vacuum circuit breaker, which can reduce the tolerance range of the height difference between the movable support shield and the end face of the porcelain shell, thereby ensuring the shielding effect.

[0005] In one aspect, an embodiment of the present application provides a vacuum interrupter, comprising:

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

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

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

[0009] According to the vacuum arc extinguishing chamber of some embodiments of the present application, the elastic mechanism includes at least one elastic member, one end of the elastic member abuts against the movable support, and the other end of the elastic member abuts against the shielding cover.

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

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

[0012] According to the vacuum arc extinguishing chamber of some embodiments of the present application, along the length direction of the porcelain shell, the distance between the end of the wing away from the base and the end of the porcelain shell close to the moving end cover plate is H, and H>0.

[0013] According to the vacuum arc extinguishing chamber of some embodiments of the present application, a first positioning structure is provided on a side of the base close to the shielding cover, and the elastic member is at least partially provided in the first positioning structure.

[0014] According to the vacuum arc extinguishing chamber of some embodiments of the present application, a second positioning structure is provided on a side of the movable support close to the movable end cover plate, and the elastic member is at least partially disposed in the second positioning structure.

[0015] According to some embodiments of the present application, the vacuum arc extinguishing chamber further includes a guide sleeve, which is arranged on the movable support, and the movable contact rod is slidably connected to the guide sleeve.

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

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

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

[0019] The vacuum arc extinguishing chamber and vacuum circuit breaker provided by the present application have a shielding cover between the movable support and the movable end cover plate, and an elastic mechanism is provided between the shielding cover and the movable support, and the elastic mechanism is used to push the shielding cover to move toward one side of the movable end cover plate, so that the shielding cover can always abut against the movable end cover plate. In this way, the stability of the relative position between the shielding cover and the movable end cover plate can be effectively guaranteed, and the influence of the height tolerance of the porcelain shell on the shielding effect of the shielding cover is reduced, which is conducive to ensuring the shielding effect of the shielding cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 A schematic diagram of a portion of the structure of a vacuum interrupter provided in one embodiment of the present application;

[0022] Figure 2 for Figure 1 A schematic diagram of the partially enlarged structure of part A;

[0023] Figure 3 It is a schematic diagram of the dimensions of the wing portion of the shielding cover and the end portion of the ceramic shell in one embodiment of the present application.

[0024] Reference numerals:

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

[0026] 200, moving contact rod;

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

[0028] 410. Static support; 420. Static contact rod. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] In conventional structures, the dynamic support shield and the dynamic support are an integrated structure. In GIS circuit breakers, their positioning is based on the position of the outlet conductor at the handle. Even if they are two separate parts, the shield is usually a fixed structure and cannot be moved at any time. Therefore, the height difference H value will increase due to the large tolerance of the porcelain shell, thus affecting the shielding effect of the dynamic support shield.

[0031] In view of this, an embodiment of the present application proposes a vacuum arc extinguishing chamber to effectively solve the aforementioned problem.

[0032] See also Figure 1As shown, an embodiment of the present application discloses a vacuum arc extinguishing chamber, which 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 is 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 arranged in 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 arranged on one side of the moving end cover plate 120, the shielding cover 320 is arranged between the moving support 310 and the moving end cover plate 120, and the shielding cover 320 is abutted against the moving end cover plate 120, the elastic mechanism is arranged between the moving support 310 and the shielding cover 320, and the elastic mechanism is used to push the shielding cover 320 toward one side of the moving end cover plate 120 so that the shielding cover 320 is abutted against the moving end cover plate 120.

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

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

[0036] See also 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 movable 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, so that the elastic member 331 can provide an elastic force for the shielding cover 320, so that the shielding cover 320 can always abut against the movable 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 circumference of the moving contact rod 200. In this way, the shielding cover 320 can be evenly stressed, so that each position of the shielding cover 320 in the circumferential direction can maintain a stable relative position with the moving end cover plate 120, which is conducive to ensuring the shielding effect of the shielding cover 320.

[0038] It should be noted that in the embodiment of the present application, the force exerted by all 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 abut against the movable end cover plate 120 under the action of the elastic mechanism.

[0039] In practical applications, the elastic member 331 may be a spring. Of course, the elastic member 331 may also be replaced by other elastic structures that can provide elastic 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 321 and a wing 322. The base 321 abuts against the movable end cover plate 120. One end of the wing 322 is connected to the base 321. The other end of the wing 322 extends along the length direction of the ceramic shell 110. Figure 1 The X direction in FIG. 1 is the length direction of the ceramic shell 110 .

[0041] In this embodiment, the wing portion 322 is in a ring shape, that is, the wing portion 322 is arranged around the circumference at this moment.

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

[0043] In some embodiments of the present application, see Figure 2 A first positioning structure 3211 is provided on one side of the base 321 close to the shielding cover 320, and the elastic member 331 is at least partially disposed in the first positioning structure 3211. Specifically, the first positioning structure 3211 has a first positioning groove, and the elastic member 331 is partially disposed in the first positioning groove. In this way, it is possible to avoid the situation where the elastic member 331 deviates and causes the relative position of the shielding cover 320 and the ceramic shell 110 to change, thereby affecting the shielding effect.

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

[0045] In some embodiments of the present application, see Figure 1 and Figure 2 The vacuum interrupter also includes a guide sleeve, which is disposed on the moving support 310, and the moving 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, so that the elastic mechanism can facilitate the shielding cover 320 to always abut against the movable end cover plate 120.

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

[0048] Further, thin wall means that the thickness of the shielding cover 320 is small, so that the weight of the shielding cover 320 can be reduced. Exemplarily, the thickness of the shielding cover 320 can be set to 2 mm, so that the shielding cover 320 is ensured to have a small thickness and the shielding cover 320 can be manufactured conveniently.

[0049] On the other hand, an embodiment of the present application discloses a circuit breaker, including a vacuum arc extinguishing chamber as described above, and having all the technical effects of the aforementioned vacuum arc extinguishing chamber, which will not be repeated here.

[0050] The vacuum interrupter and vacuum circuit breaker of the embodiment of the present application are described in detail below with a specific embodiment. It should be noted that the following embodiment is only an exemplary description and should not be understood as limiting the embodiment of the present application.

[0051] See also 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 always supported by the elastic force of one or more small return springs, and the return spring is always in a compressed state, so that the shielding cover 320 and the movable end cover plate 120 are always in contact and stopped, and the height difference H between the end of the shielding cover 320 and the end of the porcelain shell 110 can be accurately guaranteed. Among them, the elastic force design of the return spring needs to consider the gravity of the shielding cover 320, so in order to reduce the weight and cost as much as possible, the wall thickness of the shielding cover 320 should be as small as possible, and the weight 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 too high, the return spring will be further compressed, the elastic force will increase, and it will stably support the shielding cover 320, so that it can reliably contact the movable end cover plate 120 and stop; when the height of the ceramic shell 110 is too low, the return spring is originally in a compressed state, and its elastic force is greater than the gravity of the movable support 310 shield. Under the action of the return spring elastic force, it will push the shielding cover 320 upward to make it reliably contact the movable end cover plate 120 and stop. Therefore, the normal installation position of the return spring is always in a compressed state, and it is necessary to ensure that its elastic force is greater than the gravity of the shielding cover 320 and the energy of the return spring can make the movable support 310 shield continue to move upward by more than 3mm.

[0053] The reset spring may include multiple groups of small springs or a single large spring, as long as its elastic force overcomes the weight of the movable support 310 shield and can move the movable support 310 shield by 3mm.

[0054] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present 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 should not be understood as a limitation on the present application.

[0055] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0056] In the description of this 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 a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0057] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate 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 displayed in sequence as indicated by the arrows, these steps are not necessarily executed in sequence 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 a part of the steps in the flowchart 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 part of the sub-steps or stages of other steps.

Claims

1. A vacuum interrupter, It is characterized in that include: A ceramic shell and a movable end cover plate connected to one end of the ceramic shell; A moving contact rod, one end of which passes through the moving end cover plate and is partially disposed in the porcelain shell; as well as The shielding assembly includes a movable support, a shielding cover and an elastic mechanism, wherein the movable support is arranged on one side of the movable end cover plate, the shielding cover is arranged between the movable support and the movable end cover plate, and the shielding cover abuts against the movable end cover plate, and the elastic mechanism is arranged between the movable support and the shielding cover, and the elastic mechanism is used to push the shielding cover to move toward one side of the movable end cover plate so that the shielding cover abuts against the movable end cover plate.

2. The vacuum interrupter according to claim 1, It is characterized in that The elastic mechanism includes at least one elastic member, one end of the elastic member abuts against the movable support, and the other end of the elastic member abuts against the shielding cover.

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

4. The vacuum interrupter according to claim 2 or 3, It is characterized in that The shielding cover comprises a base and a wing, wherein the base is in contact with the movable end cover plate, one end of the wing is connected to the base, and the other end of the wing extends along the length direction of the ceramic shell.

5. The vacuum interrupter according to claim 4, It is characterized in that Along the length direction of the ceramic shell, the distance between the end of the wing away from the base and the end of the ceramic shell close to the movable end cover plate is H, and H>0.

6. The vacuum interrupter according to claim 4, It is characterized in that A first positioning structure is disposed on one side of the base close to the shielding cover, and the elastic member is at least partially disposed in the first positioning structure.

7. The vacuum interrupter according to claim 4, It is characterized in that A second positioning structure is provided on one side of the dynamic support close to the dynamic end cover plate, and the elastic member is at least partially disposed in the second positioning structure.

8. The vacuum interrupter according to claim 1, It is characterized in that It also includes a guide sleeve, which is arranged on the movable support, and the movable contact rod is slidably connected to the guide sleeve.

9. The vacuum interrupter according to claim 1, It is characterized in that The shielding cover is a thin-walled and lightweight part.

10. A circuit breaker, It is characterized in that Comprising the vacuum interrupter as claimed in any one of claims 1 to 9.

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