Patent ID: 7971636

Claim:
A heat exchanger comprising: a heat exchange core having a plurality of heat exchange tubes arranged in a left-right direction at a spacing; and a lower tank disposed toward a lower end of the heat exchange core, wherein the heat exchange tubes are inserted through respective tube insertion holes formed in the lower tank and joined to the lower tank, the lower tank has a plurality of drain grooves each extending from a forwardly or rearwardly outer end of each of the tube insertion holes for discharging condensation water to below the lower tank therethrough, the drain grooves are provided in positions aligned with the tube insertion holes with respect to a lateral direction, the lower tank has an upper wall having a plurality of inclined portions inclined downward toward the tube insertion holes, each of the inclined portions is left and right opposite side portions adjacent to each of the tube insertion holes in the upper wall of the lower tank and defines a recess, and each of the drain grooves has one end which is directly communicated with the recess.