Title:
HEAT EXCHANGER
Document Type and Number:
Japanese Patent JPS60263088
Kind Code:
A
Abstract:
A tube (10) for a heat exchanger is provided in one outer side face with impressions (11) which form raised portions on the inner side of the tube (10) and have a length exceeding one fourth of the circumference of the tube, and which make an angle alpha 1 of at least 10 DEG , preferably 30-40 DEG , with the longitudinal axis (1a) of the tube. In its opposite outer side face, the tube (10) has similar impressions (12) making a larger angle alpha 2 with the longitudinal axis of the tube, preferably alpha 1 + 90 DEG . The tube (10) preferably has oval cross-section with the impressions (11, 12) provided in the broad sides thereof. Such an oval tube (10) is readily manufactured by a pressing operation between press plates whose pressing surfaces are provided with ridges for making said impressions (11, 12), the spacing of the ridges, their inclination relative to the longitudinal axis (1a) of the tube (10) to be pressed, their location on one of the press plates with respect to the location on the other press plate, and their height over the press plate surface are determined on the basis of the properties pressure and velocity of the medium to be conducted through the tube (10).
Inventors:
BUYORUN INGUBAA HIRAASUTOROOMU
Application Number:
JP11130385A
Publication Date:
December 26, 1985
Filing Date:
May 23, 1985
Export Citation:
Assignee:
ARUMATSURUYONSON AB
International Classes:
B21C37/20; B21D53/06; F28D7/08; B21C37/15; F28F1/08; F28F1/42; F28F9/00; F28F9/22; F28F13/00; F28F13/02; F28F27/02; (IPC1-7): F28D7/08; F28F9/22
Attorney, Agent or Firm:
Hideto Asamura
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