DOUBLE TUBE, HEAT EXCHANGER, AND METHOD TO MANUFACTURE DOUBLE TUBE
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United States of America Patent
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Mar 16, 2017
app pub date -
Mar 5, 2014
filing date -
Mar 5, 2014
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Abstract
A double tube and the like includes: a cylindrical outer tube; a cylindrical inner tube including a helical protrusion in an outer circumferential surface, the inner tube being provided inside the outer tube; and a helical flow passage forming member that forms a helical flow passage inside the inner tube, the helical flow passage forming member being provided inside the inner tube.
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