Abgaswärmetauscher mit schräg angeordneten Gasleitsegmenten

摘要

An exhaust gas heat exchanger includes exhaust gas tubes (110) through which exhaust gas generated by a combustion flows and cooling water tubes (120) through which cooling water for cooling exhaust gas flows. Plural segments (112) of offset fins (111) are disposed within each exhaust gas tube to be arranged staggeringly in a tube longitudinal direction. The cooling water tubes communicate with each other through cooling water communication passages (120b) disposed on both end sides of each exhaust gas tube in the tube longitudinal direction at diagonal positions when being viewed from a minor-diameter direction of each exhaust gas tube. The segments are tilted relative to the tube longitudinal direction toward a side opposite to a diagonal line (L1) connecting the cooling water communication passages. Thus, a cross angle between the tilt direction of the segments and a main flow of the exhaust gas becomes smaller, and a pressure loss in the exhaust gas tubes is reduced.