Forced convection, removable bell type furnaces

Claim 1

A REMOVABLE HEATING BELL-TYPE FURNACE FOR TREATING A CHARGE WHICH IS CONSTITUTED BY A STACK OF SUPERPOSED HOLLOW REELS EACH HAVING A HOLLOW CENTRAL SPACE, THE SPACES BEING IN VERTICAL ALIGNMENT AND FORMING A VERTICAL FLUE, AND AN OBTURATOR ADAPTED TO BE OPERATIVELY DISPOSED WITH RESPECT TO SAID FLUE TO OBTURATE THE SAME, EACH OF SAID REELS OF SAID STACK BEING VERTICALLY SPACED FROM AN ADJACENT ONE BY A CONVECTOR ADAPTED TO BE INSERTED IN THE STACK OF REELS, THE FURNACE COMPRISING: LID MEANS FOR COVERING THE CHARGE IN FLUID TIGHT RELATION AND DEFINING AN ANNULAR SPACE THEREWITH, A HEATING BELL SURROUNDING THE LID MEANS, SUPPORTING MEANS HAVING A FLAT UPPER SURFACE FOR SUPPORTING THE CHARGE THEREON, OUTLET MEANS IN THE SUPPORTING MEANS ADAPTED FOR BEING LOCATED BELOW THE LOWER OPENING OF SAID VERTICAL FLUE FOR DISCHARGING FLUID THEREINTO, CENTRIFUGAL MEANS BENEATH THE OUTLET MEANS FOR FORCEABLY URGING SAID FLUID UPWARDLY IN SAID FLUE AND THROUGH THE SPACES BETWEEN ADJACENT STACKED REELS, AND INLET MEANS IN SAID SUPPORTING MEANS ADAPTED FOR BEING IN COMMUNICATION WITH SAID ANNULAR SPACE, SAID SUPPORTING MEANS DEFINING A PASSAGEWAY BELOW SAID UPPER SURFACE OF THE SUPPORTING MEANS EXTENDING BETWEEN SAID INLET MEANS, THE CENTRIFUGAL MEANS, AND THE OUTLET MEANS WHEREBY FLUID IS WITHDRAWN FROM SAID SPACE AND IS CHARGED TO THE CENTRIFUGAL MEANS VIA SAID INLET MEANS AND THEREAFTER DISCHARGED THROUGH SAID OUTLET MEANS TO SAID FLUE, SAID CENTRIFUGAL MEANS COMPRISING A CENTRIFUGAL FAN AXIALLY DISPOSED IN SAID SUPPORTING MEANS, SAID SUPPORTING MEANS FURTHER COMPRISING A CURVED DIFFUSER FOR SAID FAN AND ENVELOPING THE SAME, SAID PASSAGEWAY IN SAID SUPPORTING MEANS PROVIDING COMMUNICATION BETWEEN SAID INLET MEANS AND THE CURVED DIFFUSER.