L TYPE TURN-FIN TUBE AND TURN-FIN TYPE HEAT EXCHANGER USING THE L TYPE TURN-FIN TUBE.

摘要

An L type turn-pin tube and a turn-fin type heat exchanger using the same are provided to adhere the base portion of an L-type turn pin to a small diameter tube firmly. An L type turn-pin tube comprises a tube(20) and an L-type turn pin(30). Coolant passes through the inner space of the tube. A groove portion(51) is formed longitudinally in the L-type turn pin and comprises a base portion(55). A folded portion is formed in the groove portion of the L-type turn pin. A pin portion(56) is formed in the opposite portion of the folded portion. The base portion is formed in the exterior of the tube and formed in spiral shape.