Heat Exchanger, Particularly For A Motor Vehicle

A heat exchanger for exchanging heat between a first fluid and a second fluid, said exchanger comprising:

• a heat exchange core for a heat exchange between the first and the second fluids, comprising first circulation channels of the first fluid and second circulation channels of the second fluid between said first channels,
• an inlet collector box for the first fluid and an outlet collector box for the first fluid, into which the ends of said first channels open out, and
• an inlet connection piece for the second fluid and an outlet connection piece for the second fluid,
• wherein:
• said inlet and outlet collector boxes for the first fluid are fixed on a first side of said core and are separated by a deflector and said exchanger further comprises an intermediate collector box communicating with said first channels to create a U-circulation of the first fluid in said first channels, wherein
• said exchanger further comprises at least one wall fixed on a second side of said core adjacent to said first side and said inlet and outlet connection pieces for the second fluid are disposed at one end of said wall, being separated one from the other, and said exchanger further comprises an intermediate compartment communicating with said second channels for a U-circulation of the second fluid in said second channels, and wherein
• said intermediate collector box and said intermediate compartment are disposed on sides of said core perpendicular one to the other.