(19)
(11) EP 0 853 227 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
24.03.1999 Bulletin 1999/12

(43) Date of publication A2:
15.07.1998 Bulletin 1998/29

(21) Application number: 98100457.5

(22) Date of filing: 13.01.1998
(51) International Patent Classification (IPC)6: F28F 9/18, F28D 1/03
(84) Designated Contracting States:
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 14.01.1997 JP 4833/97

(71) Applicant: ZEXEL CORPORATION
Tokyo 150 (JP)

(72) Inventor:
  • Kato, Soichi, c/o Zexel Corporation
    Osato-gun, Saitama (JP)

(74) Representative: Füchsle, Klaus, Dipl.-Ing. et al
Hoffmann Eitle, Patent- und Rechtsanwälte, Arabellastrasse 4
81925 München
81925 München (DE)

   


(54) Heat exchanger


(57) To obtain a heat exchanger having an improved brazing property between tubes with beads formed and tube insertion holes of header pipes. A heat exchanger 1 which is formed by inserting ends of a tube 2, which has long beads 11, 11 formed to divide inside passages, into tube insertion holes 9 of header pipes 3, 4 and brazing the tube 2 with edges of the tube insertion holes 9, wherein a flat portion 2a without the beads 11 is formed on the ends of the tube 2, a burring 9a is formed on the edges of the tube insertion holes 9 so to be brazed in contact with the flat portion 2a, and the flat portion 2a is formed to have a width A in a longitudinal direction of the tube, which is larger than a width B of the burring 9a in the longitudinal direction of the tube. Accordingly, even if the inserting degree of the tube 2 is deviated to some extent, brazing between the tube and the header pipes is not affected at all.






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