Patent ID: 7507368
Filing Date: 2009-03-24
Classification: F27B

Abstract:
1. A hot-air circulation furnace comprising: a furnace body having a heat source and a rotating hearth; an annular heating-target mount having a heating-target mount shelf, which is provided at a position on the rotating hearth closer to an outer periphery of the rotating hearth along a peripheral wall of the furnace body, on which a heating-target is mounted so that the heating-target can be carried in or carried out in a radial direction, and through which a circulating flow of hot gas can pass along a vertical direction; an annular partition, which separates an interior of the furnace into an outer peripheral region in which the heating-target mount is installed and an inner region inside the outer peripheral region, and which forms upper and lower paths in which the inner peripheral region and the outer region are communicated in a vicinity of the rotating hearth of the furnace body and in a vicinity of the roof of the furnace body; an axial-flow fan, which is provided in a vicinity of a roof of the furnace body, and which draws in the hot gas heated by the heat source in a direction from its outer periphery toward its central portion and blows out the hot gas toward the rotating hearth through the inner region formed as a space inside the annular partition; and the hot gas, blown out from the axial-flow fan in the inner region, passes through the path in the vicinity of the rotating hearth in the annular partition along the annular partition, flowed out radially in the outer peripheral region outside the annular partition, passes through the heating-target mount shelves of the heating-target mount and moves upward, again heated by the heat sources, drawn into the axial-flow fan, and forming the circulating flow.