Patent ID: 7261149

Claim:
A heat exchanger comprising: an outer housing comprising an internal wall defining at least one internal chamber, incorporating at least one core having one wall defining, in the chamber, with the internal wall of the housing across from it, at least one exchange cavity, in each exchange cavity at least one tubular hollow helical pipe coil having ends that pass through the housing in order to be able to be supplied with a primary fluid circulating in this coil, at least one inlet at one axial end of the exchange cavity and at least one outlet at the other opposite axial end of the exchange cavity, in such a way that a circulation of secondary liquid can be established in an axial circulation direction in the exchange cavity between this inlet and this outlet, in contact with and on the outside of each coil that it holds, spreader elements of each coil and of the internal wall of the housing and/or of the wall of the core across from it, the spreader elements comprise at least one spreader rib, called the tangential rib, extending in projection with respect to a wall oriented across from the corresponding coil and not parallel to the axial circulation direction, but being adapted so that it does not inhibit any circulation of the secondary liquid along the axial circulation direction between the said wall and the coil, the spreader elements comprise at least one tangential helical spreader rib extending projecting from a wall arranged across from a coil, this tangential helical rib and this coil have different winding directions in such a way as to be in contact with contact zones that are essentially punctiform.