Patent ID: 7393206
Filing Date: 2008-07-01
Classification: F27B

Abstract:
1. A heat exchange furnace comprising: a combustion furnace unit adapted to burn fuel such that combustion gases are generated therein; a thermal insulating device including a lower gas-guiding member connected fixedly to a lower end of said surrounding wall for sealing a lower end of said heat exchange space, said lower gas-guiding member being formed with a plurality of lower gas transfer chambers; an upper gas-guiding member connected fixedly to an upper end of said surrounding wall for sealing an upper end of said heat exchange space, said upper gas-guiding member having a gas entrance chamber communicated with said combustion furnace unit, a gas exit chamber, a plurality of upper gas transfer chambers disposed between said gas entrance chamber and said gas exit chamber, and a gas outlet communicated with said gas exit chamber and the ambient surroundings; and a conduit assembly having at least one conduit unit including a plurality of conduit sets disposed within said heat exchange space and around said combustion furnace unit, any two adjacent ones of said conduit sets being communicated with each other by a respective one of said lower gas transfer chambers in said lower gas-guiding member and said gas entrance chamber, said gas exit chamber, and said upper gas transfer chambers in said upper gas-guiding member in such a manner that said upper and lower gas-guiding members as well as said conduit unit constitute cooperatively a serpentine gas flow path disposed within said heat exchange space.