Patent ID: 6220342
Filing Date: 2001-04-24
Classification: F25B,F28D,F28F

Abstract:
A laminated heat exchanger comprising:a tube element assembly including a plurality of tube elements laminated together along a direction of lamination, each of said tube elements including a pair of tank portions having through holes in the direction of lamination and a U-shaped passage communicating between said pair of tank portions, wherein each of said tube elements has one of said pair of tank portions located on a first side of said tube element assembly to form a first tank group, and the other of said pair of tank portions located on a second side of said tube element assembly to form a second tank group,a first tank subgroup constituted by a specific number of said tank portions of said first tank group which are disposed adjacent to each other so as to be fluidly connected,a second tank subgroup constituted by a specific number of said tank portions of said second tank group which are disposed adjacent to each other, said second tank subgroup fluidly communicating with said first tank subgroup through said U-shaped passages of said tube elements forming said tank portions of said first and second tank subgroups and the specific number of tank portions in said second tank subgroup equals the specific number of tank portions in said first tank subgroup,a first pass constituted bv one side of said U-shaped passages directly communicating with said tanks of said first tank subgroup,a second pass constituted by another side of said U-shaped passages directly communicating with said tanks of said second tank subgroup,a third tank subgroup constituted by adjacent tank portions of said second tank group which are not in said second tank subgroup, said third tank subgroup fluidly communicating with said second tank subgroup, anda fourth tank subgroup constituted by adjacent tank portions of said first tank group which are not in said first tank subgroup, said fourth tank subgroup fluidly communicating with said third tank subgroup through said U-shaped passages of said tube elements forming said tank portions of said third and fourth tank subgroups;a third pass constituted by one side of U-shaped passages directly communicating with said tanks of said third tank subgroup, anda fourth pass constituted bv another side of said U-shaped passages directly communicating with said tanks of said fourth tank subgroup;a partitioning portion dividing said first tank subgroup and said fourth tank subgroup such that said fourth tank subgroup is directly cut off from said first tank subgroup;a plurality of fins laminated alternately with said tube elements;a heat exchanging medium intake portion connected to one of said tank portions of said first tank subgroup, said one tank portion of said first tank subgroup being located approximately at a center of said first tank subgroup; anda heat exchanging medium outlet portion connected to one of said tank portions of said fourth tank subgroup, said one tank portion of said fourth tank subgroup being located approximately at a center of said fourth tank subgroup,wherein a constricting portion is formed by making said through hole in at least one tank portion smaller than said through holes in the other tank portions, said at least one tank portion being located at an upstream side with respect to an inflow direction of said heat exchanging medium in said third tank subgroup.