Patent ID: 9074820
Filing Date: 2015-07-07
Classification: F28D,F28F

Abstract:
1. A heat exchanger comprising: a plurality of flat tubes in which a fluid flows, each tube including a first flat surface and a second flat surface opposite to the first flat surface; a plurality of fins each of which is connected to adjacent flat surfaces of adjacent tubes to increase a heat exchange area on a side of air flowing outside of the tubes; a flow resistance portion comprising a plurality of outer protrusion portions protruding from only the first flat surface of each of the tubes to an outside of each of the tubes by a protrusion dimension; and, a plurality of inner protrusion portions protruding from only the second flat surface of each of the tubes to an inside of each of the tubes, the outer protrusion portions and the inner protrusion portions being aligned with one another in a tube stacking direction, the plurality of outer protrusion portions being aligned with one another along a direction perpendicular to a coolant flow direction in the flat tubes, and the plurality of inner protrusion portions being aligned with one another along a direction perpendicular to the coolant flow direction in the flat tubes; wherein the fin includes a plate portion having a plate surface, and fin protrusions protruding from the plate surface of the plate portion, the fin protrusions are provided to be spaced from the flat surface of the tube by a distance, the protrusion dimension of the flow resistance portion protruding from the flat surface of the tube is equal to or larger than the distance, the surface of the fin is attached to each of the tubes at positions overlapping each of the plurality of inner protrusion portions; and the first flat surface having the outer protrusion portions and the second flat surface having the inner protrusion portions directly define a single fluid passage in which the fluid flows.