| 摘要 |
PURPOSE: An L-form turn-fin tube with a columnar protrusion structure is provided to enlarge a contact area of a-form turn-fin tube and external air, thereby improving heat-exchanging efficiency. CONSTITUTION: An L-form turn-fin tube comprises a tube(100) and an L-form turn-fin. The L-form turn-fin is spirally wound in the outer periphery of the tube. The L-form turn-fin is composed of a fin unit(210) and a base unit. The base unit is spirally wound in the outer periphery of the tube along a longitudinal direction. A protrusion unit(230) of predetermined radius is formed on the surface of the L-form turn-fin. A spiral-shaped groove is formed in the outer periphery of the tube. The base of the L-form turn-fin is seated in the groove, thereby being supported. |
