Tube for a heat exchanger of an automobile vehicle, comprises an oval form cross-sectional boundary with small and large axes, successive undulations defined by a longitudinal periodic variation, and a wall with constant thickness

摘要

#CMT# #/CMT# The tube (12) for a heat exchanger of an automobile vehicle, comprises an oval form cross-sectional boundary (26) with a small axis and a large axis with a constant diameter, successive undulations (30) defined by longitudinal periodic variation in a small axis region, and a wall with constant thickness. The boundary has a double symmetry according to the axes, a diameter shrinkage with a curvature inversion in a small axis region, and defines two wall concavities in a central part of the tube section. The concavities turn one towards the other in a center of the boundary. #CMT# : #/CMT# Independent claims are included for: (1) a heat exchanger; and (2) a process for the fabrication of a tube. #CMT#USE : #/CMT# The tube is useful for a heat exchanger (claimed) of an automobile vehicle. #CMT#ADVANTAGE : #/CMT# The tube ensures high mechanical properties and controlled axial effort during its expansion operation, and avoids shrinking during its simple manufacture. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The figure shows a schematic view of radially expanded tube with undulations. 12 : Tubes 24 : Rod 26 : External boundary 30 : Undulations 42 : Shrinkage.