Air, water composite cooling pipe dedicated to large and medium size electrical motor

The composite cooling tube includes base tube and radiating tube. Annular fins are prepared on external surface of the radiating tube. The fin is in wedged structure with lower thicker and upper thinner. Slot base face between fins is in arc shape. Width of fin is 8-20 mm. Advantages are: good cooling effect, saving water, saving electricity, high intensity. Compared with other cooling tubes, the disclosed cooling tube possesses features of good heat elimination power of temperature difference under same volume unit, small composite tolerance, and good contact between two kinds of tube, and good effect of heat transfer. Compared with same kind of domestic products, the disclosed cooling tube raises composite performance 30%, and raises heat exchange performance more than 10%. The said wedged structure raises impact capability of anti wind in high pressure effectively and service life.