Endurance heat exchanger main leaf flange structure

The utility model provides an endurance heat exchanger main leaf flange structure is equipped with the heat transfer tube hole on the main leaf, it is downthehole that the heat exchange tube inserts the main leaf heat exchange tube, is connected as an organic wholely through mode of brazing and main leaf. The past main leaf outside orientation turn -ups of main leaf heat transfer tube hole, two turn down rims length of branch limits and both ends round -corner edge all are higher than four angles, make turn -ups edge length longer than flat turn -ups, and the main leaf turn -ups is marginal when brazing forms the welding seam with the heat exchange tube. Under the operating condition, the outer flange structure of main leaf heat transfer tube hole makes on the inside stress that transmitsthe heat exchange tube of heat exchanger all acts on the welding seam of main leaf and heat exchange tube, and long welding seam makes the stress dispersion of welding seam to reduce the fatigue stress of heat exchange tube w