Patent ID: 7635019

Claim:
A heat exchanger comprising: a heat exchange core having tube groups in the form of a plurality of rows arranged in parallel in a front-rear direction each group comprising a plurality of heat exchange tubes arranged in a row along a left-right direction at a spacing; and a lower tank disposed at the lower end of the heat exchange core, the lower tank having a plurality of headers arranged in the front-rear direction and having joined thereto the respective groups of the heat exchange tubes, wherein: the heat exchange tubes of each tube group being joined to each of the headers while being inserted through respective tube insertion holes formed in a top wall of the header, the headers adjacent to each other being connected to each other by a connector, the adjacent headers and the connector providing a drain gutter extending in the left-right direction, the drain gutter having front and rear opposite side faces extending respectively forwardly and rearwardly outward away from each other as the side faces extend upward, each of the tube insertion holes having one end adjacent to the connector and positioned in the side face of the drain gutter, each of the heat exchange tubes having a side end adjacent to the connector and positioned in the drain gutter, and the headers positioned respectively at forwardly and rearwardly outer end portions of the lower tank are provided in forwardly and rearwardly outer side portions of top surfaces thereof with drain grooves extending from the respective tube insertion holes for discharging condensation water to below the lower tank therethrough.