To achieve improvement in performance of a heat exchanger by preventing inflow of brazing filler material into a refrigerant circulating hole due to a capillary phenomenon and restraining the occurrence of clogging.
This heat exchanger 1 includes: a porous flat tube 2 formed of aluminum; and a tank part 5 in which the flat tube 2 is inserted, wherein the end of the flat tube 2 is provided with a groove 7 formed deeper than the distance L1 between the inner face 5A of the tank part 5 and the end face 2A of the flat tube 2. The distance (L1 + L2) from the inner face 5A of the tank part 5 to the base 7A of the groove 7 is secured enough, whereby inflow of brazing filler material into the tube due to a capillary phenomenon can be prevented.
COPYRIGHT: (C)2008,JPO&INPIT
Iwa Saki Kokuni
Kawamata Sumio
Masakazu Ito
Shunichi Takahashi
Toshio Takamatsu
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