초록 ▼

An exhaust gas heat exchanger includes exhaust gas tubes through which exhaust gas generated by a combustion flows and cooling water tubes through which cooling water for cooling exhaust gas flows. Plural segments of offset fins are disposed within each exhaust gas tube to be arranged staggeringly i

An exhaust gas heat exchanger includes exhaust gas tubes through which exhaust gas generated by a combustion flows and cooling water tubes through which cooling water for cooling exhaust gas flows. Plural segments of offset fins 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 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.

대표청구항 ▼

[ What is claimed is:] [1.]1. A heat exchanger comprising:an exhaust gas tube through which exhaust gas generated by a combustion flows, said exhaust gas tube having a flat sectional shape;a plurality of cooling fluid tubes through which cooling fluid for cooling exhaust gas flows, said cooling flui

[ What is claimed is:] [1.]1. A heat exchanger comprising:an exhaust gas tube through which exhaust gas generated by a combustion flows, said exhaust gas tube having a flat sectional shape;a plurality of cooling fluid tubes through which cooling fluid for cooling exhaust gas flows, said cooling fluid tubes being disposed adjacent to both ends of said exhaust gas tube in a minor-diameter direction of said exhaust gas tube; andan offset fin disposed within said exhaust gas tube, said offset fin having a plurality of plate-like segments which are approximately parallel to said minor-diameter direction and are arranged in a longitudinal direction of said exhaust gas tube in such a manner that adjacent segments in the longitudinal direction are offset from each other in a major-diameter direction of said exhaust gas tube,wherein said segments are disposed to be tilted in a tilt direction relative to said longitudinal direction.