| 摘要 |
A plate-fin-tube type heat exchanger is constructed with a multitude of plate fins juxtaposed one another and a plurality of heat transmitting tubes passing through said plate fins and being held thereby. A plurality of cut and raised pieces are formed to intersect orthogonally with the air flowing direction at both front and rear surfaces of said plate fins with a certain space interval among them in the air flowing direction and at a location between the adjacent heat transmitting tubes arranged in the longitudinal direction of said plate fins, and then the edge portion on both sides of each cut and raised piece is re-bent in the direction opposite to the lifting direction of said piece and in substantially parallel with the surface of said plate fin so that the cross-section of said cut and raised piece may assume a sloping form in the direction of the air flow and that fin base plate portion may be present between the adjacent cut and raised pieces in parallel with the air flow. |
