Down-draft heating device

Abstract

A heating device includes: a primary burn chamber; a secondary burn chamber; a solid fuel support structure separating the primary burn chamber and the secondary burn chamber, the fuel support structure being operable to support a solid fuel for burning in the primary burn chamber, to pass air from the secondary burn chamber to the primary burn chamber and to pass gas and particulates from the primary burn chamber to the secondary burn chamber; an exhaust port operable to exhaust air; a cooling chamber disposed between the secondary burn chamber and the exhaust port, the cooling chamber being operable to extract heat from gases from the secondary burn chamber; a first port operable to supply external air to the primary burn chamber; a second port operable to supply external air to the secondary burn chamber; and a gas flow controller.

What is claimed as new and desired to be protected by Letters Patent of the United States is: 
     
         1 . A heating device comprising;
 a primary burn chamber;   a secondary burn chamber;   a solid fuel support structure separating said primary burn chamber and said secondary burn chamber, said solid fuel support structure being operable to support a solid fuel for burning in said primary burn chamber, to pass air from said secondary burn chamber to said primary burn chamber and to pass gas and particulates from said primary burn chamber to said secondary burn chamber;   an exhaust port operable to exhaust gases;   a cooling chamber disposed between said secondary burn chamber and said exhaust port, said cooling chamber bung operable to extract heat from gases from said secondary burn chamber;   an first port operable to supply external air to said primary burn chamber;   a second port operable to supply external air to said secondary burn chamber; and   a gas flow controller operable to block said exhaust port in a downdraft mode thus preventing exhaust gases from exhausting, through said exhaust port and operable to unblock said exhaust port in a updraft mode such that exhaust gases exhaust through said exhaust port.   
     
     
         2 . The heating device of  claim 1 , wherein said solid fuel support structure comprises one of the group consisting of a grate, a mesh, a slotted-structure, a screen and combinations thereof. 
     
     
         3 . The heating device of  claim 1 , further comprising:
 a primary burn chamber window covering said primary burn chamber; and   a secondary burn chamber window covering said secondary burn chamber.   
     
     
         4 . The heating device of  claim 3 ,
 wherein said primary burn chamber window is openable, and   wherein said secondary burn chamber window is openable.   
     
     
         5 . The heating device of  claim 1 , wherein said gas flow controller comprise a rod and a baffle. 
     
     
         6 . The heating device of  claim 1 ,
 wherein said secondary burn chamber comprises a first ceramic material, and   wherein said solid fuel support structure comprises a second ceramic material.   
     
     
         7 . The heating device of  claim 6 ,
 wherein said secondary burn chamber additionally comprises a first metal, and   wherein said first metal of said secondary burn chamber is partially surrounded by said first ceramic material.   
     
     
         8 . The heating device of  claim 1 , further comprising;
 a first exhaust manifold operable to extract heat from a first portion of gasses passing from said secondary burn chamber to said cooling chamber; and   a second exhaust manifold operable to extract heat from a second portion of gasses passing from said secondary burn chamber to said cooling chamber,   wherein said secondary burn chamber is disposed between said first exhaust manifold and said second exhaust manifold.   
     
     
         9 . The heating device of  claim 8 , wherein said first exhaust manifold comprises a structure having an gas path leading from said secondary burn chamber to said cooling chamber and a plurality of heat sink protrusions protruding into said gas path. 
     
     
         10 . The heating device of  claim 1 , wherein said solid fuel support structure is disposed between said first port and said second port. 
     
     
         11 . The heating device of  claim 1 , wherein said first port comprises a plurality of holes.