| 摘要 |
In a heat exchanger used for an EGR cooler or the like, in order to provide a heat exchanger that has a small number of parts, is assembled easily, can flow cooling water evenly at each part, and does not cause partial boiling, a strip-shaped metal plate is turned up and bent in a fanfold manner, flat first flow channels 3 and second flow channels 4 are formed alternately, both the ends of the first flow channels 3 are closed with slit blocks 6, projecting stripes 3a are bent and formed at the positions of ports 11 for the cooling water 10 in proximity to the slit blocks 6, and gaps 3c are formed between respective paired projecting stripes 3a.
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