Patent ID: 9671177
Date: 2017-06-06
CPC Classifications: B23P,F24F,F28F,Y10T

Claim:
1. A heat exchanger comprising: a plurality of plate-like fins having a plurality of notches that are open at edges of the plate-like fins and openings being separate from the notches, the plate-like fins being stacked with a spacing between adjacent plate-like fins sufficient for a fluid to flow between the adjacent plate-like fins; and a plurality of flat tubes placed in the notches of the plate-like fins and configured to exchange heat with a heat-exchange medium flowing through the flat tubes, wherein the notches of the plate-like fins are longer than a longitudinal axis of the flat tubes, the plate-like fins have projections including bend portions that project toward the edges more than the ends of the flat tubes, the bend portions extend in a stacking direction in which the plate-like fins are stacked and contact an adjacent stacked plate-like fin, a length of the bend portions in the stacking direction is equal to a length of the spacing between the adjacent plate-like fins, fin collars substantially perpendicularly extend from at least part of rims of the notches, a length of the fin collars in the stacking direction is smaller than the length of the spacing between the adjacent plate-like fins, the plate-like fins include burring on edges of the openings, the burrings projecting annularly in the stacking direction of the plate-like fins and contacting an adjacent plate-like fin, and a length of the burrings in the stacking direction is equal to the length of the spacing between the adjacent plate-like fins.