VACUUM INTERRUPTER WITH VACUUM DEVICE SHIELD

Abstract

A vacuum interrupter including a nominally cylindrical insulator having a first insulator portion and a second insulator portion defining a gap therebetween and a nominally cylindrical vapor shield having a first ring of a plurality of spaced apart bobbles and a second ring of a plurality of spaced apart bobbles. A gap ring including a series of spaced apart cut-out notches facing the vapor shield is positioned within the gap. The plurality of bobbles in the first and second ring of bobbles are configured so that the bobbles in the second ring pass through the cut-out notches in the gap ring and the bobbles in the first ring rest on the gap ring.

Claims

1. A vacuum interrupter comprising: a nominally cylindrical insulator including a first insulator portion and a second insulator portion defining a gap therebetween; a nominally cylindrical vapor shield including a first ring of a plurality of spaced apart bobbles and a second ring of a plurality of spaced apart bobbles; and a gap ring positioned within the gap and including a series of spaced apart cut-out notches facing the vapor shield, wherein the plurality of bobbles in the first and second rings of bobbles are configured so that the bobbles in the second ring pass through the cut-out notches in the gap ring and the bobbles in the first ring rest on the gap ring.

2. The vacuum interrupter according to claim 1 wherein each bobble in the first ring of bobbles is positioned within an indentation in the first insulator portion and each bobble in the second ring of bobbles is positioned within an indentation in the second insulator portion.

3. The vacuum interrupter according to claim 1 wherein each bobble in the first ring of bobbles is axially aligned with a bobble in the second ring of bobbles, and wherein the vapor shield is assembled by inserting the vapor shield into the insulator so that the second ring of bobbles pass through the cut-out notches in the gap ring and the vapor shield is rotated before the bobbles in the first ring pass through the cut-out notches in the gap ring.

4. The vacuum interrupter according to claim 1 wherein each bobble in the second ring of bobbles is axially aligned with a bobble in the first ring of bobbles, and wherein the first ring of bobbles includes more bobbles than the second ring of bobbles.

5. The vacuum interrupter according to claim 1 wherein each bobble in the first and second rings of bobbles are radially offset from each other.

6. The vacuum interrupter according to claim 1 wherein the bobbles in the second ring of bobbles are all positioned on an axial plane.

7. The vacuum interrupter according to claim 1 wherein the gap ring is brazed or welded to the vapor shield.

8. The vacuum interrupter according to claim 1 wherein the number of cut-out notches and bobbles in the second ring is in the range of 3-10.

9. The vacuum interrupter according to claim 8 wherein the number of cut-out notches and bobbles in the second ring is 4.

10. The vacuum interrupter according to claim 1 wherein the vapor shield is a single piece vapor shield.

11. A vacuum interrupter comprising: a nominally cylindrical insulator including a first insulator portion and a second insulator portion defining a gap therebetween; a nominally cylindrical vapor shield including a first ring of a plurality of spaced apart bobbles and a second ring of a plurality of spaced apart bobbles, wherein each bobble in the first and second rings of bobbles are radially offset from each other; and a gap ring positioned within the gap and including a series of spaced apart cut-out notches facing the vapor shield, wherein the number of bobbles in the second ring is equal to the number of cut-out notches in the gap ring.

12. The vacuum interrupter according to claim 11 wherein each bobble in the first ring of bobbles is positioned within an indentation in the first insulator portion and each bobble in the second ring of bobbles is positioned within an indentation in the second insulator portion.

13. The vacuum interrupter according to claim 11 wherein the gap ring is brazed or welded to the vapor shield.

14. The vacuum interrupter according to claim 11 wherein the number of cut-out notches and bobbles in the second ring is in the range of 3-10.

15. The vacuum interrupter according to claim 14 wherein the number of cut-out notches and bobbles in the second ring is 4.

16. The vacuum interrupter according to claim 11 wherein the vapor shield is a single piece vapor shield.

17. A vacuum interrupter comprising: a nominally cylindrical insulator including a first insulator portion and a second insulator portion defining a gap therebetween; a single piece nominally cylindrical vapor shield including a first ring of a plurality of spaced apart bobbles and a second ring of a plurality of spaced apart bobbles; and a gap ring positioned within the gap and including a series of spaced apart cut-out notches facing the vapor shield, wherein each bobble in the first ring of bobbles is positioned within an indentation in the first insulator portion and each bobble in the second ring of bobbles is positioned within an indentation in the second insulator portion.

18. The vacuum interrupter according to claim 17 wherein each bobble in the first ring of bobbles is axially aligned with a bobble in the second ring of bobbles, and wherein the vapor shield is assembled by inserting the vapor shield into the insulator so that the second ring of bobbles pass through the cut-out notches in the gap ring and the vapor shield is rotated before the bobbles in the first ring pass through the cut-out notches in the gap ring.

19. The vacuum interrupter according to claim 17 wherein each bobble in the second ring of bobbles is axially aligned with a bobble in the first ring of bobbles, and wherein the first ring of bobbles includes more bobbles than the second ring of bobbles.

20. The vacuum interrupter according to claim 17 wherein each bobble in the first and second rings of bobbles are radially offset from each other.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0008] FIG. 1 is a cut-away isometric view of a portion of a vacuum interrupter showing a known vapor shield;

[0009] FIG. 2 is a cut-away isometric view of a portion of a vacuum interrupter showing another known vapor shield;

[0010] FIG. 3 is a cut-away isometric view of a portion of a vacuum interrupter showing a vapor shield including a ring with cut-out notches and upper and lower aligned bobbles;

[0011] FIG. 4 is a top view of the ring with the cut-out notches separated from the vacuum interrupter shown in FIG. 3;

[0012] FIG. 5 is a cut-away isometric view of a portion of a vacuum interrupter showing a vapor shield including the ring with the cut-out notches and more upper bobbles than lower bobbles; and

[0013] FIG. 6 is a cut-away isometric view of a portion of a vacuum interrupter including a vapor shield having the ring with the cut-out notches and radially offset upper and lower bobbles.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] The following discussion of the embodiments of the disclosure directed to a vacuum interrupter including split insulator portions, a single piece vapor shield and a ring having cut-out notches positioned between the insulator portions, where bobbles in a lower shield portion pass through the cut-out notches and bobbles in an upper shield portion rest on the ring is merely exemplary in nature, and is in no way intended to limit the disclosure or its applications or uses.

[0015] FIG. 1 is a cut-away isometric view of a portion of a vacuum interrupter 10 including an upper nominally cylindrical ceramic insulator 12 and a lower nominally cylindrical ceramic insulator 14 defining a gap 16 therebetween, where a vacuum chamber 18 is provided within the insulators 12 and 14 and where fixed and movable contacts (not shown) would be provided within the chamber 18. These and other parts of the vacuum interrupter 10 are not shown for clarity purposes, but their location and operation would be well understood by those skilled in the art. The vacuum interrupter 10 also includes a cylindrical vapor shield 20 positioned within the chamber 18 and against an inside surface of the insulators 12 and 14, which operates to collect metal vapor that is emitted when the contacts separate and the vacuum interrupter 10 is opened, thus preventing a metal coating from forming on the insulators 12 and 14, which could create a conductive path around the separated contacts. In this known design, the vapor shield 20 includes an upper cylindrical portion 22 and a lower cylindrical portion 24 that are brazed or welded together along a seam 26, where the lower portion 24 includes a flange ring 28 positioned within the gap 16. The vapor shield 20 can be made of any suitable material, such as copper, steel, etc. The upper portion 22 includes a bobble 30 that seats within an indentation (not shown) in the upper insulator 12 to provide axial positioning of the upper portion 22 relative to a center axis of the vacuum interrupter 10 and the insulator 12, and the lower portion 24 includes a bobble 32 that seats within an indentation (not shown) in the lower insulator 14 to provide axial positioning of the lower portion 24 relative to the center axis of the vacuum interrupter 10 and the insulator 14. As used herein, a bobble is a feature formed on the shield that has a greater pitch circle diameter (PCD) than the body of the shield and acts to locate the shield radially relative to the upper and lower portions 22 and 24.

[0016] FIG. 2 is a cut-away isometric view of a portion of a vacuum interrupter 40, where like elements to the vacuum interrupter 10 have the same reference number. In this known design, the vapor shield 20 is replaced with a vapor shield 42 that includes a single piece cylindrical tube 44 formed to an inside surface of the upper and lower insulators 12 and 14. An L-shaped annular ring 46 is brazed or welded to the tube 44 and is positioned within the gap 16. The shield 42 is axially positioned relative to the insulators during assembly using external jigging (not shown).

[0017] Improvements in the design of the vapor shields can be made so that the shield can be a single piece and not require external jigging for axial alignment of the vapor shield.

[0018] FIG. 3 is a cut-away isometric view of a portion of a vacuum interrupter 50, where like elements to the vacuum interrupter 10 have the same reference number. In this design, the vapor shield 20 is replaced with a vapor shield 52 that includes an upper ring 54 of spaced apart bobbles 56 and a lower ring 58 of spaced apart bobbles 60, where each bobble 56 in the upper ring 54 is axially aligned with a bobble 60 in the lower ring 58. The vacuum interrupter 50 also includes a ring 62 positioned within the gap 16 and having spaced apart cut-out notches 64 facing the vapor shield 52. FIG. 4 is a top view of the ring 62 separated from the vacuum interrupter 50. The spacing between and the number of the cut-out notches 64 matches the spacing between and the number of the bobbles 56 in the upper ring 54 and the spacing between and the number of the bobbles 60 in the lower ring 58. During assembly of the vacuum interrupter 50, the ring 62 is positioned and secured within the gap 16, and the vapor shield 52 is slid into the chamber 18 so that the bobbles 56 and 60 are aligned with the cut-out notches 64. After the lower ring 58 of the bobbles 60 passes through the cut-out notches 64, but before the upper ring 54 of the bobbles 56 passes through the cut-out notches 64, the vapor shield 52 is rotated a certain amount so that the bobbles 56 and 60 axially align with indentations (not shown) in the upper and lower cylindrical insulators 12 and 14. The shield 52 is inserted further into the chamber 18 until the bobbles 56 contact and sit on a portion of the ring 62 that does not have the cut-out notches 64 and the bobbles 56 and 60 are seated within the indentations. The vapor shield 52 is then brazed or welded to the ring 62.

[0019] The terminology upper ring and lower ring are used herein as the bobbles 56 in the ring 54 and the bobbles 60 in the ring 58 are positioned on an axial plane. However, in certain embodiments, the bobbles 60 in the lower or second ring may be axially offset from each other and not all be in the same axial plane. The intent is that in those embodiment, the bobbles 60 are still defined as a ring of bobbles. Further, in this non-limiting embodiment there are four equally spaced cut-out notches 64 and bobbles 56 and 60, where the vapor shield 52 can be rotated 45?. However, other numbers of cut-outs and bobbles may be suitable, such as any number between 3 and 10 cut-outs and bobbles.

[0020] FIG. 5 is a cut-away isometric view of a portion of a vacuum interrupter 70, where like elements to the vacuum interrupter 50 have the same reference number. In this design, the vapor shield 50 is replaced with a vapor shield 72 that includes the upper ring 54 of the spaced apart bobbles 56 and the lower ring 58 of the spaced apart bobbles 60, but where there are more or additional bobbles 74 in the upper ring 54 than the bobbles 60 in the lower ring 58 and the cut-out notches 64. In other words, the vapor shield 72 still includes the axially aligned bobbles 56 and 60, but there is not a counterpart bobble in the lower ring 58 or cut-out notch 64 to the additional bobbles 74. Thus, the shield 72 does not need to be rotated after the lower ring 58 of the bobbles 60 pass through the cut-out notches 64 because the additional bobbles 74 will rest on the ring 62. Appropriate indentations (not shown) are provided at the proper locations in the insulators 12 and 14 so that the bobbles 56, 60 and 74 are positioned therein.

[0021] FIG. 6 is a cut-away isometric view of a portion of a vacuum interrupter 80, where like elements to the vacuum interrupter 50 have the same reference number. In this design, the vapor shield 50 is replaced with a vapor shield 82 that includes the upper ring 54 of the spaced apart bobbles 56 and the lower ring 58 of the spaced apart bobbles 60, but where the bobbles 56 and 60 are not axially aligned with each other, which is defined herein as being radially offset. Therefore, the shield 82 does not need to be rotated after the lower ring 58 of the bobbles 60 pass through the cut-out notches 64 because the bobbles 56 will rest on the ring 62. Appropriate indentations (not shown) are provided at the proper locations in the insulators 12 and 14 so that the bobbles 56 and 60 are positioned therein.

[0022] The foregoing discussion discloses and describes merely exemplary embodiments of the present disclosure. One skilled in the art will readily recognize from such discussion and from the accompanying drawings and claims that various changes, modifications and variations can be made therein without departing from the spirit and scope of the disclosure as defined in the following claims.