WÄRMTETAUSCHERROHRE

摘要

PCT No. PCT/GB93/01332 Sec. 371 Date Sep. 30, 1994 Sec. 102(e) Date Sep. 30, 1994 PCT Filed Jun. 24, 1993 PCT Pub. No. WO94/00726 PCT Pub. Date Jan. 6, 1994.A heat exchange tube (1) comprises, in its formed state, an outer wall (4) surrounding a plurality of internal fins (2) which extend along the length of the tube. The fins (2) and outer wall (4) are formed from a unitary portion of sheet material, the fins comprising respective groups of fins extending from a common longitudinal seam line (3) in mutually opposed directions transverse to the longitudinal direction of the tube and seam. The tube (1) is typically formed by means of a roll forming process in which the groups of fins (2) are initially formed in the sheet or strip and portions of the strip subsequently plastically deformed symmetrically about a longitudinal axis of the sheet or strip to provide the outer wall. Typically the tube is formed from sheet or strip aluminum (or an alloy thereof) and the tube subsequently brazed when formed. The heat exchange tube (1) is suitable for use in vehicle radiators, condensers, oil coolers etc.