Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1984-05-18
1985-07-09
Macon, Robert S.
Electricity: circuit makers and breakers
Liquid contact
Time delay
H01H 3366
Patent
active
045284326
ABSTRACT:
A vacuum interrupter, an envelope of which includes a pair of electrical lead rods of copper or copper-based alloy, one lead rod being brazed vacuum-tight to one end plate via a first tubular sealing member fitted onto one rod, and a bellows surrounding another lead rod, an outer end of the bellows being joined vacuum-tight to another end plate and an inner end of the bellows being brazed vacuum-tight to the other lead rod via a second tubular sealing member fitted onto the other lead rod. Each sealing member is made of an iron-based alloy and has an inner wall including a groove retaining solid brazing metal and two vacuum-tight brazing surfaces opposing each rod across a small clearance. The molten brazing metal permetates through the clearance due to wetablility and capillary action without erodingly diffusing into the opposing surfaces of the lead rods and the first and second sealing members.
REFERENCES:
patent: 3727018 (1973-04-01), Wesoloski et al.
patent: 4077114 (1978-03-01), Sakuma
patent: 4394554 (1983-07-01), Warabi et al.
patent: 4408107 (1983-10-01), Sakuma et al.
Senba Katsuaki
Warabi Junichi
Kabushiki Kaisha Meidensha
Macon Robert S.
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