Dual-tube-pass heat exchanger using cross spiral pipe

The utility model is a double tube pass heat exchanger, relates to a heat exchanger which makes the passage of the heat exchange tube and the heat exchange medium cross, in order to improve the exhaust gas recirculation system of the engine and the heat-exchange efficiency. The heat exchanger includes a shell body, a heat exchange tube, a pass partition plate, a tube plate and a tube box. The heat exchange tube is a cross helical groove heat exchange tube, including a stainless steel tube, the surface of which is equipped with a cross helical groove protruding to the inner. The crossing is X- shaped, the section shape of the stainless steel tube body is special flat, and the height and width of the section shape of the flat heat exchange tube is not equal. The heat exchanger divides the tube into two pass by the pass partition plate, and the tube number of the two pass is different. The double tube pass heat exchanger is applicable specially to exhaust gas recirculation system as automotive engine to improve the efficiency of the heat exchanger and discharge performance index, and meet the discharge requirement for the environmental protection. The utility model worked as a cooler in the turbine pressure booster can improve the performance of the engine.