Method for sealing vacuum structure
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United States of America Patent
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Jul 24, 2001
Issued Date -
N/A
app pub date -
Aug 9, 1999
filing date -
Aug 10, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention is a method of sealing a metal vacuum structure (vacuum bottle) for evacuating a space S closed by component members (an inner shell 2 and an outer shell 3) through an evacuation port and then sealing the evacuation port. Forming a brazing-material placing recess 6 in one of the component members, the brazing-material placing recess opening downward when the structure is set for evacuation; forming an aperture 7 in the brazing-material placing recess; placing brazing material, in molten state, in the brazing-material placing recess in such a way as to block the aperture and fixing the brazing material; forming an evacuation port 8a in the brazing material; fixing a drop preventing member 9 having a through hole 11 on the component member in opposed relation to the brazing material; evacuating the space closed by the component members through the evacuation port of the brazing material; melting the brazing material; and making the evacuation port disappear to seal it by melting the brazing material as the drop preventing member prevents the brazing material from dropping.
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