Heat exchanger having integrated tank header and partition structure and partition inserting groove with leak detection

A heat exchanger, comprising:

• a plurality of tubes which are arranged in parallel at a predetermined distance to be parallel with the direction of air flow and used as a flow path for a heat exchange medium;
• a plurality of radiating fins which are interposed between the tubes;
• headers which are formed with a plurality of tube inserting holes into which each end portion of the tube is fixedly inserted;
• tank which is coupled with an upper portion of the headers and used as a passage for the a heat exchange medium;
• at least one partition wall which is integrally formed with the header and partitions the passage for the heat exchange medium;
• a partition inserting groove which is formed in a longitudinal direction of the tank so as to jointly insert the upper end portion of the partition wall therein;
• and
• a leakage checking hole formed through the partition inserting groove and arranged to fluidly connect a space to outside of the tank,
• wherein the space is formed between the partition inserting groove and an upper surface of the partition wall inserted into the partition inserting groove
• whereby leaks are directed into and through said space to said leak checking hole for easy detection of leaks.