Improved heat transfer tube with grooved inner surface

A lamp tube (10) inner surface of the group of annular wing pieces (12) and between the two-way the fin (26), the middle fins located at the annular fin (12) and area (24) and to the annular fin (12) is angle. On the internal surface tube pattern's The preferred embodiment, the middle fin (26) relative to the base fin (12), a to form the shape of the inner cylinder. The first set of formed of the annular wing plate is at least one side (12) and fin (26) whose. Capable of the second group of to further enhance wherein performance. The needs the figure by stamping to the plate, and clamping plate is welded and A Pipe, to enable the inner surface form of the rubber pipe at least comprises between the fin of the invention conception.