Arrangement of inlet and outlet pipes for an evaporator

A heat exchanger, for a vehicle air-conditioning loop, comprising a multiplicity of pockets (1) mutually stacked in a longitudinal direction an each defining two chambers (6,7) juxtaposed in a lateral direction in such a way as to form part respectively of a first and a second row of chambers, as well as U-shaped elementary path extending substantially in a plane perpendicular to the longitudinal direction from one to the other of said chambers in order to circulate a first fluid in thermal contact with a second fluid, two chambers of a same row, belonging to tow neighboring pockets of the stacks, being delimited in the longitudinal direction by respective walls placed one against the other, certain of these walls (8) being provided with openings (9) allowing a leaktight communication of fluid between the adjacent chambers, the exchanger additionally comprising an inlet pipe (17) and an outlet pipe (18) for the first fluid, disposed at a first longitudinal end (21) of the exchanger, substantially in the alignment of said first and second rows respectively, and each communicating with one of the chambers, wherein one at least (17, 18) of said pipes communicates with the corresponding chamber via an end box (10) supplementing the stack of pockets at said first end,

• wherein the end box is formed by a flat and vertical end plate (12) and by a dished plate (11) disposed between said end plate (12) and said stack of pockets at said first end, said end plate (12) and dished plate (12) being joined along a periphery (13), and wherein said dished plate (11) is joined in a leaktight manner to an inner face of the end plate in a median zone (14) to define two separate compartments (15, 16) in an interior of said end box (10).