Dual flow heating apparatus

DETAILED DESCRIPTION A forced air circulation heating apparatus is provided in which an air stream is heated at a first location in a conduit means and then transported to a second remote location by the conduit means and is forced into a heating compartment in which an air flow fan operates to establish a recirculated air flow internally within the heating compartment and to mix the heated air stream with the recirculated air flow.
An air controller means is also provided to vary the proportions of the heated air stream and the recirculated air flow within the heating compartment.
The heating apparatus can be preferably constructed so that the air conduit and the heating compartment have a wall in common whereby the heated air stream indirectly heats the heating compartment during circulation of the heated air to the air flow fan.
The heated air stream then enters directly into the heating compartment to provide a direct heating effect in addition to the indirect heating.
The air flow fan comprises two sets of impeller blades positioned on either side of a rotating centrally disposed circular plate which provides for the forced intake of two air streams, one flowing along the fan axis in a first direction and a second air stream flowing along the fan axis in the opposite direction both moving inwardly toward the center plate.
In this manner, the air flow fan provides motive force for both the heated air stream and the recirculated air flow within the heating compartment and also provides for mixing of the same.
The air flow fan is located in the heating compartment and is positioned between one of the walls of the heating compartment and a divider panel spaced therefrom which is provided with a central aperture for allowing the recirculated air flow to enter the air flow fan from internally within the heating compartment.
The controller means for varying the proportions of the heated air stream and the recirculated air flow within the heating compartment can be arranged to alternately block a heat collector duct or a flue through which variable proportions of the heated air stream can exit from the heating apparatus