COIL-ANNEALING SPACER

摘要

A spacer, locating a set of upper and lower discs, each having a round hole in center, and being fixed w.r.t. each other, comprises vertical ribs spreading from the hole to the periphery of the discs in radial or spiral form, and attaches heat transmitting fins to the wall of the gas flowing passage formed with the discs and the ribs.