EXHAUST HEAT EXCHANGE APPARATUS

摘要

PROBLEM TO BE SOLVED: To prevent heat exchange from being performed excessively on a medium/high-load side where an exhaust gas flow rate is high in spite of the simple configuration in which a movable part such as a valve member is not used.

SOLUTION: An exhaust heat exchange apparatus 10 is configured so that an exhaust gas flows branched into a heat exchange passage 15 and a bypass passage 14. A cooling water passage 16 in which cooling water for heat exchange flows is disposed in the surrounding of the heat exchange passage 15. The bypass passage 14 is disposed inside the heat exchange passage 15 so as not to be adjacent to the cooling water passage 16. A throttling section 40 for reducing the passage cross section of the heat exchange passage 15 is provided so that the flow rate of the heat exchange passage 15 is constant when the exhaust gas flow rate is high.

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