Double pipe type heat exchanger and method for manufacturing the same
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United States of America Patent
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Nov 21, 2017
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N/A
app pub date -
Apr 27, 2015
filing date -
Aug 18, 2010
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Abstract
A double pipe type heat exchanger includes an inner pipe having a first flow path defined therein and an outer pipe arranged around the inner pipe to define a second flow path between the inner pipe and the outer pipe. The inner pipe includes a spiral groove formed on an outer circumferential surface of the inner pipe to extend along a longitudinal direction of the inner pipe. The outer pipe includes a reduced diameter portion protruding inwardly so that the inner surface of the outer pipe is intermittently contacted with the outer circumferential surface of the inner pipe.
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