Helical tube EGR cooler
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United States of America Patent
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Mar 28, 2017
Grant Date -
Oct 24, 2013
app pub date -
Apr 16, 2013
filing date -
Apr 18, 2012
priority date (Note) -
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Abstract
A heat exchanger for transferring heat between two fluids consists of a shell surrounding at least two tube bundles attached at both ends to a tube header. Each of the tube bundles is constructed from a plurality of individual tubes that are twisted into identical helixes formed about a common helical axis. Because each individual tube is formed in the shape of a helix, rather than as a straight tube, thermal elongation of the individual tubes results in a considerably reduced axial force on the tube attachments and tube header. Use of multiple tube bundles wound with opposite twist direction improves spacing efficiency between tubes.
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