(19)
(11) EP 0 435 839 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.11.1991 Bulletin 1991/48

(43) Date of publication A2:
03.07.1991 Bulletin 1991/27

(21) Application number: 90850424.4

(22) Date of filing: 21.12.1990
(51) International Patent Classification (IPC)5: F28D 7/02
(84) Designated Contracting States:
AT BE CH DE DK ES FR GB GR IT LI LU NL SE

(30) Priority: 27.12.1989 SE 8904369
02.04.1990 SE 9001194

(71) Applicant: ELGE AB
S-581 10 Linköping (SE)

(72) Inventor:
  • Eriksson, Rune
    S-582 63 Linköping (SE)

(74) Representative: Berglund, Erik Wilhelm et al
Berglunds Patentbyra AB Aspebraten
590 54 Sturefors
590 54 Sturefors (SE)


(56) References cited: : 
   
       


    (54) Heat exchanger and a method for its fabrication


    (57) Heat exchanger including progressively angled or over their length slightly spirally wound tubes (1, 2) extending between two tube plates (4). The tubes (1 and 2) are arranged in two concentric circles and the tubes of the different circles are given differing progression so that the same tube length can be used in the different concentric circles of the tubes. The tubes (1, 2) are corrugated over their length and the rings of tubes are in close contact with each other. In the end of the tubes the tube plates (4) are achieved by widening the ends of the pipe so that they come in contact with each other, whereafter the ends are soldered to each other. The tube bundle is surrounded by a tight fitting shell (3) and wide surrounding connections (5, 6) allowing the heat exchanger to be easily coupled in series parallel etc.






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