Self-enclosing heat exchanger with crimped turbulizer

A heat exchanger (10) of plate type, of the type comprising: second (20) first plate (18) and including each plate (18, 20) a flat central portion (70), a first pair of spaced-apart bosses (72, 74) extending from one side of the planar central portion (70), and a second pair of spaced projections (76, 78) extending from the opposite side of the flat central portion (70), each one of said projections (72, 74, 76, 78) a portion (80) inner peripheral edge and a portion (82) outer peripheral edge defining a fluid port (87, 86, 85, 84); a continuous ridge (88) surrounding portions (80) peripheral edge within at least the first pair of projections (72, 74) and extending from the planar central portion (70) in the same direction and equidistantly to portions (82) outer peripheral edge of the second pair of projections (76, 78); including each plate (18, 20) a raised peripheral flange (90) extending over the flat central portion (70) in the same direction and equidistantly with the portions (82) outer peripheral edge of the first pair of bosses (72 , 74); being juxtaposed first core plates (18) and second (20), so that snagging one of the continuous ridge (88) and the peripheral flanges of the plate (90) engage; whereby a first fluid chamber defined between the ridges (88) or peripheral flanges (90) engaged; being in coincidence fluid ports (87, 86, 85, 84) in the second (76, 78) respective pairs of first spaced projections (72, 74) and; and it is positioned a third plate (16) in juxtaposition with one of the second (20) first plate (18) and to define a second fluid chamber between the third plate (16) and the central flat portion (70) of the plate (18) adjacent; and it characterized in that: each flat (70) central portion includes a barrier formed by a rib (92, 106) and a complementary groove (100, 108), the rib (92, 106) between portions (80) being located inner peripheral edge of the projections of one pair (72, 74, 76, 78) of projections to reduce flow short circuit between them, being also located the complementary groove (100, 108) between the projections of of said one pair (72, 74, 76, 78) of projections, to promote through-flow therebetween.