Patent ID: 7571761

Claim:
A heat exchanger comprising: a core portion including a plurality of tubes extending in a tube longitudinal direction, in which a first medium flows, the core portion being disposed to perform heat exchange between the first medium flowing in the tubes and a second medium passing through the core portion outside the tubes; and an upstream tank portion, connected to one end of the tubes and extending in a tank longitudinal direction perpendicular to the tube longitudinal direction, for distributing and supplying the first medium into the tubes, wherein the upstream tank portion comprises a first distribution passage for distributing the first medium in the tank longitudinal direction so as to distribute the first medium into the tubes laminated in a direction parallel to the tank longitudinal direction, a plurality of second distribution passages provided to respectively correspond to the tubes, the plurality of second distribution passages being configured to distribute the first medium from the first distribution passage into the tubes in a tank width direction that is perpendicular to both the tube longitudinal direction and the tank longitudinal direction, and a plurality of communication passage through which the first medium flowing in the tank longitudinal direction via the first distribution passage is supplied to the second distribution passages; wherein the plurality of communication passages are provided to respectively correspond to the tubes; and the plurality of second distribution passages are located at positions offset from the first distribution passage in the tank width direction.