Overpressure-resistant vacuum interrupter tube

Abstract

A vacuum interrupter tube contains at least one insulating body, a fixed contact, a fixed contact flange, a moving contact having a longitudinal axis, a moving contact flange, and a bellows. The fixed contact is stationarily arranged in the fixed contact flange. The moving contact is moveably guided and the moving contact is moveably secured to the moving contact flange by the bellows. The bellows is secured to the moving contact flange by a first bellows end and the bellows is secured to the moving contact by a second bellows end. Therein the vacuum interrupter tube is protected against the deformation of at least one of the fixed contact flange and the moving contact flange due to an ambient pressure of the vacuum interrupter tube of over two bar by a stiffened fixed contact flange and/or a stiffened moving contact flange.

Claims

1. A vacuum interrupter tube, comprising: at least one insulating body; a fixed contact; a fixed contact flange, said fixed contact is disposed in a positionally fixed manner in said fixed contact flange; a moving contact having a longitudinal axis; a moving contact flange; a bellows having a first bellows end and a second bellows end; said moving contact being movably guided and said moving contact being movably secured to said moving contact flange by said bellows, said bellows secured to said moving contact flange by said first bellows end and said bellows is secured to said moving contact by said second bellows end; a fixed contact flange stiffener, said fixed contact flange and said fixed contact flange stiffener being formed as a one-piece configuration defining a heavier fixed contact flange; a moving contact flange stiffener, said moving contact flange and said moving contact flange stiffener being formed as a one-piece configuration defining a heavier moving contact flange; said fixed contact flange stiffener or said moving contact flange stiffener being a structural element which only partially reproduces a shape of said fixed contact flange and/or of said moving contact flange that is oriented into an interior of the vacuum interrupter tube; said structural element having a first region and a second region said second region of said structural element supporting said first region of said structural element against said insulating body; at least one of said heavier fixed contact flange or said heavier moving contact flange being formed from a material having a coefficient of expansion being a same as a coefficient of expansion of said insulating body; and the vacuum interrupter tube being protected against deformation of at least one of said fixed contact flange and said moving contact flange by an ambient pressure of the vacuum interrupter tube of over two bar, by means of said fixed contact flange stiffener and/or said moving contact flange stiffener.

2. The vacuum interrupter tube according to claim 1, wherein said first region extends substantially perpendicularly to the longitudinal axis of said moving contact and said second region extends substantially parallel to the longitudinal axis of said moving contact, wherein said first region substantially reproduces a shape of said fixed contact flange and/or of said moving contact flange that is oriented into the interior of the vacuum interrupter tube and said second region substantially supports said first region.

3. The vacuum interrupter tube according to claim 2, further comprising a shielding disposed between said fixed contact flange and/or said moving contact flange and said insulating body or on said fixed contact flange and/or said moving contact flange.

4. The vacuum interrupter tube according to claim 3, wherein said second region of said structural element supports said first region of said structural element against said insulating body via said shielding; and said first region protects said fixed contact flange and/or said moving contact flange against deformation.

5. The vacuum interrupter tube according to claim 1, wherein said structural element or said structural elements is or are not soldered to the vacuum interrupter tube or to other components of the vacuum interrupter tube.

6. The vacuum interrupter tube according to claim 1, wherein said insulating body is formed from a ceramic, and in that said heavier fixed contact flange and/or said heavier moving contact flange contains an FeNiCo alloy or is formed therefrom.

7. A switchgear assembly, comprising: the vacuum interrupter tube according to claim 1 for media voltage applications or high-voltage applications; a gas-tight container filled with an insulating gas, said vacuum interrupter tube is disposed in said gas-tight container and said insulating gas in said gas-tight container has a pressure of at least 2 bar.

8. The switchgear assembly as claimed in claim 7, wherein said insulating gas in said gas-tight container has a pressure of at least 3 bar.

9. The switchgear assembly according to claim 7, wherein said insulating gas contains at least one fluoroketones, nitriles, nitrogen, oxygen and carbon dioxide.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

(1) FIG. 1: section through the region of the fixed contact flange of a conventional vacuum interrupter tube

(2) FIG. 2: section through region of the fixed contact flange of a vacuum interrupter tube according to the invention with a stiffened fixed contact flange

(3) FIG. 3: section through a vacuum interrupter tube with a stiffened fixed contact flange and stiffened moving contact flange according to the invention;

(4) FIG. 4: section through region of the fixed contact flange of a vacuum interrupter tube according to the invention with a stiffened contact flange

DETAILED DESCRIPTION OF THE INVENTION

(5) FIG. 1 shows a section through the region of the fixed contact flange 40 of a conventional vacuum interrupter tube. The fixed contact rod 32 is connected to the fixed contact flange 40 and guided in this manner into the interior of a vacuum interrupter tube. The fixed contact flange 40 is in turn secured to an insulating part 20 of the vacuum interrupter tube. In the example shown, a shielding element 90 is secured between the fixed contact flange 40 and the insulating part 20. Alternatively, the shielding element 90 may also be secured to the fixed contact flange 40 and the fixed contact flange 40 may be secured directly to the insulating part 20.

(6) A heavier design of the fixed contact flange 40, i.e. a design in which the material strength and material thickness has been increased, would lead in the region where the fixed contact flange 40 is connected directly or via a shielding element to the insulating element, to heavy mechanical loads and would thus prevent permanent operability of the vacuum interrupter tube.

(7) FIG. 2 shows a section through the region of the fixed contact flange 40′ of a vacuum interrupter tube according to the invention with a stiffened fixed contact flange 40′. The fixed contact rod 32 is again connected to the fixed contact flange 40′ and is guided in this manner into the interior of a vacuum interrupter tube according to the invention. The fixed contact flange 40′ is in turn secured to an insulating part 20 of the vacuum interrupter tube. In the example shown, a shielding element 90 is secured between the fixed contact flange 40′ and the insulating part 20. Alternatively, the shielding element 90 can also be secured to the fixed contact flange 40′ and the fixed contact flange 40′ can be secured directly to the insulating part 20.

(8) In the example of FIG. 2, the fixed contact flange 40′ is stiffened by the structural element 45. The structural element 45 in a first region 46, which is oriented substantially perpendicularly to the longitudinal axis 56 of the fixed contact 30, substantially reproduces the shape of the fixed contact flange 40′ that is directed into the interior of the vacuum interrupter tube and, in this case, even lies against the fixed contact flange 40′. In a second region 47 of the structural element 45 that is oriented substantially parallel to the longitudinal axis 56 of the fixed contact 30, the second region 47 supports the first region 46 against the fixed contact flange 40′. Alternatively, the second region 47 of the structural element 45 can also support the first region 46 of the structural element 45 against the insulating element 20 and/or the shielding element 90.

(9) FIG. 3 shows a section through a vacuum interrupter tube 10 with a stiffened fixed contact flange 40′ and stiffened moving contact flange 60′ according to the invention. In this exemplary embodiment, the vacuum interrupter tube 10 has four insulating elements 20, with an intermediate element 25 which can be composed of an electrically conductive or electrically non-conductive material being arranged between two insulating elements 20.

(10) The moving contact 50 is movably guided into the vacuum interrupter tube 10 by means of a bellows 80, wherein a first bellows end 82 is secured to the stiffened moving contact flange 60′ and a second bellows end 84 is secured to the moving contact rod 52, either directly or via a bellows cap 86. In addition, the bellows cap has an optional bellows shield 88.

(11) The moving contact flange 60′ is connected to an insulating element 20 of the vacuum interrupter tube 10 directly or via a shielding element 90.

(12) The moving contact flange 60′ is stiffened by the structural element 65. The structural element 65 has a first region 66 which is oriented substantially perpendicularly to the longitudinal axis 56 of the moving contact 50, substantially reproduces the shape of the moving contact flange 60′ that is directed into the interior of the vacuum interrupter tube and, in this case, even lies against the moving contact flange 60′. In a second region 67 of the structural element 65 that is oriented substantially parallel to the longitudinal axis 56 of the moving contact 50, the second regions 67 supports the first region 66 against the moving contact flange 60′. Alternatively, the second region 67 of the structural element 65 can also support the first region 66 of the structural element 65 against the insulating element 20 and/or the shielding element 90.

(13) In the exemplary embodiment, the moving contact 50 consists of a moving contact rod 53, a moving contact body 55 and a moving contact contact disk 54.

(14) The fixed contact 30 is formed here by a fixed contact rod 32, a fixed contact body 35 and a fixed contact contact disk 34 and is connected to the fixed contact flange 40′ and is guided in this way into the interior of a vacuum interrupter tube 10 according to the invention. The fixed contact flange 40′ is in turn secured to an insulating part 20 of the vacuum interrupter tube. In the example shown, a shielding element 90 is secured between the fixed contact flange 40′ and the insulating part 20. Alternatively, the shielding element 90 can also be secured to the fixed contact flange 40′ and the fixed contact flange 40′ can be secured directly to the insulating part 20.

(15) In the example of FIG. 3, the fixed contact flange 40′ is stiffened by the structural element 45. The structural element 45 in a first region 46, which is oriented substantially perpendicularly to the longitudinal axis 56 of the fixed contact 30, substantially reproduces the shape of the fixed contact flange 40′ that is directed into the interior of the vacuum interrupter tube and, in this case, even lies against the fixed contact flange 40′. In a second region 47 of the structural element 45 that is oriented substantially parallel to the longitudinal axis 56 of the fixed contact 30, the second region 47 supports the first region 46 against the fixed contact flange 40′. Alternatively, the second region 47 of the structural element 45 can also support the first region 46 of the structural element 45 against the insulating element 20 and/or the shielding element 90.

(16) FIG. 4 shows a section through region of the fixed contact flange 40″ of a vacuum interrupter tube according to the invention with a stiffened fixed contact flange 40″.

(17) The fixed contact rod 32 is connected to the fixed contact flange 40″ and is guided in this way into the interior of a vacuum interrupter tube according to the invention. The fixed contact flange 40″ is secured to an insulating part 20 of the vacuum interrupter tube. In the example shown, a shielding element 90 is secured between the fixed contact flange 40″ and the insulating part 20. Alternatively, the shielding element 90 can also be secured to the fixed contact flange 40′ and the fixed contact flange 40″ can be secured directly to the insulating part 20.

(18) In the example of FIG. 4, the fixed contact flange 40″ is stiffened by the fact that a heavier design, i.e. thicker in terms of material, of the stiffened fixed contact flange 40″ is used, wherein the stiffened fixed contact flange 40″ is formed from a material which has a coefficient of expansion which is similar to the coefficient of expansion of the insulating body 20.

(19) Heavier or thicker material, heavier or thicker design of the material is intended to mean in this connection that the fixed contact flange 40″ has a greater material thickness 41.

LIST OF REFERENCE SIGNS

(20) 10 Vacuum interrupter tube 20 Insulating body 25 Intermediate element 30 Fixed contact 32 Fixed contact rod 34 Fixed contact contact disk 35 Fixed contact body 40, 40′, 40″ Fixed contact flange 42 Material thickness of the fixed contact flange 40″ 45 Structural element 46 First region of the structural element 45 47 Second region of the structural element 45 50 Moving contact 52 Moving contact rod 54 Moving contact contact disk 55 Moving contact body 56 Longitudinal axis of the moving contact and fixed contact 60, 60′ Moving contact flange 65 Structural element 66 First region of the structural element 65 67 Second region of the structural element 65 70 Moving contact bearing 80 Bellows 82 First bellows end 84 Second bellows end 86 Bellows cap 88 Bellows shield 90 Shielding element