(19)
(11) EP 1 128 148 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
20.03.2002 Bulletin 2002/12

(43) Date of publication A2:
29.08.2001 Bulletin 2001/35

(21) Application number: 01103635.7

(22) Date of filing: 22.02.2001
(51) International Patent Classification (IPC)7: F28D 1/03, B21C 37/15
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 25.02.2000 JP 2000054428

(71) Applicant: Denso Corporation
Kariya-city, Aichi-pref., 448-8661 (JP)

(72) Inventor:
  • Kokubunji, Hiroshi
    Kariya-shi, Aichi 448-8661 (JP)

(74) Representative: Klingseisen, Franz, Dipl.-Ing. et al
Patentanwälte, Dr. F. Zumstein, Dipl.-Ing. F. Klingseisen, Postfach 10 15 61
80089 München
80089 München (DE)

   


(54) Heat exchanger


(57) A heat exchanger, in which the space (110a) in each of a plurality of tubes (110) is segmented by a partitioning wall (111), and dimples (protrusions) (112) are formed on the inner wall of the tubes (110), is disclosed. The substantial sectional area of the flow path, which has a large effect on the flow velocity in the tubes (110), can thus be reduced without increasing the total number of the tubes (110). Even in the case where the radiation area is enlarged by increasing the long diameter of the tube (110), therefore, a turbulent flow of the cooling water can be obtained in collaboration with the agitating action of the dimples (112). In this way, the reduction in heat transfer coefficient between the cooling water and the tubes (110) can be prevented. As a result, the radiation capacity of the radiator (100) can be improved while suppressing the increase in the number of the parts and the production cost of the radiator (100), thereby producing a radiator suitable for large automotive vehicles.






Search report