VACUUM INTERRUPTER

Abstract

A vacuum interrupter includes at least one insulating body, a fixed contact, a fixed contact flange, a moving contact having a longitudinal axis of the moving contact, a moving contact flange, a moving contact bearing, and a bellows. The fixed contact is stationarily disposed in the fixed contact flange, the moving contact is moveably guided in the moving contact bearing 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. An increased pressure resistance of the vacuum interrupter against ambient pressures over 1 bar is achieved by a sleeve which is secured to the moving contact against movements along the longitudinal axis of the moving contact, and which is guided through the moving contact bearing.

Claims

1-13. (canceled)

14. A vacuum interrupter, comprising: at least one insulating body; a fixed-contact flange; a fixed contact disposed in a stationary manner in said fixed-contact flange; a moving-contact bearing; a moving contact having a longitudinal axis, said moving contact being movably guided in said moving-contact bearing; a moving-contact flange; a bellows having a first bellows end and a second bellows end, said bellows movably fastening said moving contact to said moving-contact flange by fastening said first bellows end to said moving-contact flange and fastening said second bellows end to said moving contact; and a sleeve providing an increased pressure resistance of the vacuum interrupter against ambient pressures over 1 bar, said sleeve being fixed on said moving contact against movements along said longitudinal axis of said moving contact and said sleeve passing through said moving-contact bearing.

15. The vacuum interrupter according to claim 14, wherein: said sleeve fixed on said moving contact extends out from said second bellows end through said moving-contact bearing; and a fastening device fixes said sleeve on said moving contact and prevents relative movement along said longitudinal axis of said moving contact between said moving contact and said sleeve during movement of said moving contact.

16. The vacuum interrupter according to claim 14, wherein said moving contact has at least one moving-contact rod and at least one moving-contact contact disk, and said second bellows end is directly connected to said at least one moving-contact rod.

17. The vacuum interrupter according to claim 14, wherein said moving contact has a moving-contact rod and a moving-contact contact disk, and a bellows cap connects said second bellows end to said moving-contact rod.

18. The vacuum interrupter according to claim 17, wherein: said moving contact has a thickened portion not present at said sleeve; and said sleeve is fixed in position on said moving contact in at least one of a region of said second bellows end or a region of said bellows cap by a press fit, latching, interlocking, soldering or welding of said thickened portion.

19. The vacuum interrupter according to claim 18, wherein said press fit of said sleeve is provided between said second bellows end and said moving contact or between said bellows cap and said moving-contact rod.

20. The vacuum interrupter according to claim 14, wherein said moving-contact bearing has at least one first guide element, said sleeve has at least one second guide element, and said first guide element and said second guide element engage in each other to prevent said sleeve from rotating in said moving-contact bearing.

21. The vacuum interrupter according to claim 20, wherein said first guide element and said second guide element engaging in each other mutually limit their movement to prevent said sleeve from sliding out of said moving-contact bearing.

22. The vacuum interrupter according to claim 20, wherein said moving contact includes a moving-contact rod having at least one third guide element, and said sleeve has at least one fourth guide element acting in combination to prevent rotation of said sleeve on said moving-contact rod.

23. The vacuum interrupter according to claim 14, wherein said sleeve is composed of a material having a coefficient of friction being low enough to enable smooth sliding and stopping.

24. The vacuum interrupter according to claim 14, wherein said sleeve is composed of polytetrafluoroethylene or of a modification of polytetrafluoroethylene.

25. The vacuum interrupter according to claim 17, wherein at least one of said second bellows end or said bellows cap has a bellows shield.

26. The vacuum interrupter according to claim 25, wherein said bellows shield extends from said second bellows end toward said moving-contact flange.

Description

[0028] The invention is explained in the following on the basis of the figures.

[0029] FIG. 1: section through a vacuum interrupter with a sleeve according to the invention;

[0030] FIG. 2: section through a moving-contact rod with a sleeve and a bellows cap with a bellows shield;

[0031] FIG. 3: perspective view of a guided sleeve in a moving-contact bearing;

[0032] FIG. 4: perspective representation of a moving contact with a sleeve and guide elements.

[0033] FIG. 1 shows a section through a vacuum interrupter 10 having a sleeve 90 according to the invention. The vacuum interrupter 10 in this case has insulating elements 20, which in this case, optionally, are spaced apart in the region of the contact disks by an intermediate element 25.

[0034] The vacuum interrupter 10 additionally has a fixed contact 30, in this case consisting of a fixed-contact rod 32, a fixed-contact body 35 and a fixed-contact disk 34. The fixed contact 30 is fastened at one end of the vacuum interrupter 10, by means of a fixed-contact flange 40, to an insulating body 20.

[0035] A moving contact 50 of the vacuum interrupter 10 is arranged opposite the fixed contact 20, the moving contact 50 in this case consisting, as an example, of a moving-contact rod 52, a moving-contact body 55 and a moving-contact contact disk 54.

[0036] Fastened on the moving contact 50, or more precisely, on the moving-contact rod 52, there is a sleeve 90, and this sleeve 90 is extended out from the bellows through a moving-contact bearing 70 on the moving-contact flange 60. In the example shown here, the sleeve 90 is pressed tightly between the moving-contact rod 52 and the bellows cap 86. The sleeve 90 is thus fixed on the moving contact 52 in such a manner that there is no relative movement between the sleeve 90 and the moving contact 50 as the moving contact 50 moves along the longitudinal axis 56 of the moving contact 50. The bellows 80, which enables the moving contact 50 to move within the vacuum interrupter 10, is fastened to the moving-contact flange 60 by a first end 82 of the bellows 80. In FIG. 1, the second end 84 of the bellows 80 is fastened to the bellows cap 86, and the bellows cap 86 is in turn fastened to the moving-contact rod 52 of the moving contact 50. In FIG. 1, the bellows cap 86 has an optional bellows shield 88, which extends from the bellows cap 86, along the bellows 80, toward the moving-contact flange 60.

[0037] FIG. 2 shows a moving-contact rod 52, with a sleeve 90, which is pressed into the press-in region 89 between the moving-contact rod 52 and the bellows cap 86, in the direction of the arrow 91. Optionally, this press-in region 89 may also be formed by a thickened portion of the moving-contact rod. In addition, the bellows cap 86 has a bellows shield 88, as shown in FIG. 1.

[0038] FIG. 3 shows a portion of a moving-contact rod 52 with a third guide element 53, a sleeve 90 with a fourth guide element 94, and with a second guide element 92 in the sleeve 90 that acts in combination with the first guide element 72 of the moving-contact bearing 70, which is not shown here, but which is shown in FIG. 4.

[0039] FIG. 4 shows a sleeve 90 in a moving-contact bearing 70, the sleeve 90 having two second guide elements 92, 92, and the moving-contact bearing 70 having two corresponding first guide elements 72, 72. The first guide elements 72, 72 in this case are realized as groove engagements, i.e. fixed structural elements. The second guide elements 92, 92 in this example are realized as a groove. The groove 92 in this case extents over the entire length of the sleeve 90, but is delimited at one end, thereby preventing the sleeve 90 and the moving contact 50, not shown, that is connected to the sleeve 90 from slipping through the moving-contact bearing 70.

LIST OF REFERENCES

[0040] 10 vacuum interrupter [0041] 20 insulating body [0042] 25 intermediate element [0043] 30 fixed contact [0044] 32 fixed-contact rod [0045] 34 fixed-contact contact disk [0046] 35 fixed-contact body [0047] 40 fixed-contact flange [0048] 50 moving contact [0049] 52 moving-contact rod [0050] 53 third guide element [0051] 54 moving-contact contact disk [0052] 55 moving-contact bearing [0053] 56 longitudinal axis of the moving contact [0054] 60 moving-contact flange [0055] 70 moving-contact bearing [0056] 72 first guide element [0057] 72 further first guide element [0058] 80 bellows [0059] 82 first bellows end [0060] 84 second bellows end [0061] 86 bellows cap [0062] 88 bellows shield [0063] 89 press-in region [0064] 90 sleeve [0065] 91 arrow for the direction of pressing-in of the sleeve [0066] 90 [0067] 92 second guide element [0068] 92 further second guide element [0069] 94 fourth guide element