Double-pipe heat exchanger and manufacturing method thereof
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United States of America Patent
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Jul 26, 2011
Grant Date -
Oct 16, 2008
app pub date -
Jan 21, 2005
filing date -
Mar 17, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A double-tube heat exchanger that is easy to produce, the entire part of which is smoothly bent so that the heat exchanger works as a part of piping, and that has high pressure resistance. In the cross-section perpendicular to the axis of an inner tube (1), there are bag-like or ballon-like bulged sections (7a) directing radially from the center, and openings of the bulged sections (7a) are closed and the head of each bulged section (7a) is in contact with the inner surface of an outer tube (2).
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