High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Vacuum
Patent
1998-02-02
1998-12-08
Friedhofer, Michael A.
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Vacuum
218134, 218155, H01H 3366
Patent
active
058473475
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to the field of electric switches, specifically a vacuum interrupter that can be used as a switching element in low-voltage contactors.
BACKGROUND INFORMATION
A known vacuum interrupter for low-voltage contactors comprises essentially a two-pole contact arrangement and a vacuum-tight housing enclosing this contact arrangement, with the housing being formed by a metal cap, a hollow cylindrical ceramic insulator and bellows. The metal cap is soldered to the current conducting pin of the stationary contact and to the insulator at the end face, and furthermore, the bellows are soldered to the insulator at the end face and to a ring flange on the current conducting pin of the movable contact at the other end. To protect the inside surface of the ceramic insulator of this known vacuum interrupter from metal vapor deposition and thus guarantee the internal insulation strength of the vacuum interrupter and also protect the bellows from metal vapor deposition, the inside diameter of the ceramic insulator surrounding the current conducting pin of the stationary contact is designed to be as small as possible. This measure does not, however, completely prevent metal vapor deposition on the inside surface of the ceramic insulator (See German Patent No. A1 37 09 585 and U.S. Pat. No. 4,672,156).
With another known vacuum interrupter of this type, a flange is first provided on the end face of the ceramic insulator facing the bellows, where it is soldered to the bellows and is butt soldered to the end face of the ceramic insulator with a short tubular piece. A gap of a predetermined length is created between the end face of the ceramic insulator and the flange with the help of the short tubular piece. Since the end face of the ceramic insulator is not metal-plated in the area of this gap, the end face of the ceramic insulator facing away from the contacts ensures the internal dielectric strength of the vacuum interrupter. Special shielding for the ceramic insulator can be omitted (See European Patent No. A1 0 563 830 and U.S. Pat. No. 5,315,081).
With another known vacuum interrupter for low-voltage contactors, a tubular shield, with a rim that widens to a cap at one end, is provided for the ring-shaped ceramic insulator. This rim is soldered to a ring attachment which is in turn soldered to the end face of the ceramic insulator facing the two contacts. Several soldering operations are necessary to manufacture this vacuum interrupter (See German Patent No. 33 43 918 A1 and U.S. Pat. No. 4,614,850).
It is also known that in manufacturing vacuum interrupters, the end of the bellows can be soldered to the end of a ceramic part by a tubular piece (European Patent 0 40 933 A1) and for the housing, cap-like parts made of copper and electroplated with silver can be used, so it is not necessary to use a soldering ring for soldering to a ceramic part or a metal part (See Published International Application No. WO 95/00459).
SUMMARY OF THE INVENTION
The present invention is directed to a vacuum interrupter with a two-pole contact arrangement and a housing enclosing the contact arrangement. The housing comprises a metal cap soldered to the current conducting pin of the stationary contact and surrounds both the stationary contact and the movable contact, a bellows, as well as a hollow cylindrical insulator soldered to the metal cap at the end face. The bellows is soldered to both the insulator at the end and a ring flange on the current conducting pin of the movable contact. An object of the present invention is to provide effective shielding of the insulator, while allowing a simple method of manufacturing the vacuum interrupter, preferably with a single soldering operation.
The aforementioned object is achieved in accordance with the present invention by.
This object is achieved according to this invention by providing the insulator with a tubular shield which is in turn provided with a flange-like rim at one end and is in contact with the end face of the insulator facing
REFERENCES:
patent: 3369094 (1968-02-01), Langberg et al.
patent: 4431885 (1984-02-01), Sakuma et al.
patent: 4614850 (1986-09-01), Kuhl
patent: 4672156 (1987-06-01), Basnett
patent: 4746777 (1988-05-01), Bialkowski et al.
patent: 5206616 (1993-04-01), Stegmuller
patent: 5315081 (1994-05-01), Hartmann
Kusserow Jorg
Oberndorfer Klaus
Schwarze Wolfgang
Friedhofer Michael A.
Siemens Aktiengesellschaft
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