| 摘要 |
PURPOSE:To increase cooling effect and to drastically reduce the infiltrated quantity of external heat by making the external cylinder covering a conductor alternately project or recess along the direction of length in the cross section along radial direction. CONSTITUTION:The external cylinder 12 covering a conductor 11 is made to alternately have a recession 13 and a projection 14 in the cross section of radial direction and the heat transfer route from one end of the other end is extended without increasing the dimension of the length and the surface area of the external cylinder is increased. This can reduce the infiltrated quantity of external heat and the rise of temperature due to generation of heat in the conductor is also restrained. |
