Patent ID: 7694728

Claim:
A heat exchanger comprising a core body in which a strip-shaped metal plate is turned up and bent in a fanfold manner with turned-up end edges alternately formed at a first end and a second end of a rectangular flat face portion, and flat first flow passages and second flow passages are provided alternately in the thickness direction of the metal plate; a pair of comb-state members, wherein each of the first flow passages of the core body is blocked by a comb tooth of the pair of comb-state members at both end positions of said turned-up end edges; a fin set within said second flow passages; a tubular casing having a first end portion and a second end portion, wherein an outer periphery of the core body is fitted with the tubular casing so as to block adjacent turned-up end edges; an inlet port on an outer face of said casing fluidly connected to the first flow passage; an outlet port on the outer face of said casing fluidly connected to the first flow passage, wherein a first fluid is guided to each of the first flow passages by the inlet port and guided from each of the first flow passages by the outlet port; each of the comb-state members being further comprised of a tooth base, the tooth base having a tooth connecting side, a distal side opposing the tooth connecting side in a first direction from the tooth connecting side to a proximal end position of the end positions of the turned up edges, and a tooth base brazing side extending between the tooth connecting side and the distal side along the turned up edges on the first end of the flat face portion, the tooth base brazing side being attached to the turned up edges on the first end of the flat face portion by brazing; and the comb-state members each including comb teeth, each comb tooth of the comb teeth being comprised of a root and an extending portion, the root being connected to and extending from the tooth connecting side of the tooth base in a second direction opposing said first direction then turning back to the first direction and extending in the first direction to the extending portion, the extending portion being connected to the root where the root extends in the first direction at a position offset in the first direction from the tooth connecting side of the tooth base.