Combustion Chamber for Charcoal Stove

Abstract

A combustion chamber may include an upper and a lower chamber. The chambers may be separable to aid in loading fuel and removing spent fuel. The cross-section of the upper combustion chamber may be less than the cross-section of the lower section. Charcoal or other biomass fuel may be added into the lower combustion chamber and may be supported by a grate. Oxygen may be fed into the combustion chamber through a plurality of apertures that may be substantially shielded from direct line of site of the fuel bed. The upper combustion chamber may further include an annular constriction, to aid in constricting the view factor between the cooking vessel and the fuel bed. The constriction may also aid in radiating energy back to the fuel bed.

What is claimed is: 
     
         1 . A biomass stove comprising;
 an upper section defining an upper combustion chamber and a lower rim,   a lower section defining a lower combustion chamber and an upper rim, wherein
 the upper and lower sections are separably engaged at said respective upper rim and lower rim, 
 an orifice ring positioned in the upper section spaced away from the upper rim of said lower section, 
 the lower combustion chamber for receiving fuel, and 
 a plurality of air flow apertures, wherein the apertures are substantially shielded from the direct line of site of fuel positioned on the grate. 
   
     
     
         2 . A biomass combustion chamber comprising;
 an upper combustion chamber including an orifice ring positioned within the upper combustion chamber;   a lower combustion chamber, wherein
 the lower combustion chamber includes 
 a grate for supporting a solid fuel, said fuel being positioned below said orifice ring, 
 a plurality of air flow apertures for allowing oxygen into the combustion chamber, wherein the apertures are substantially shielded from the direct line of site of the fuel bed, and 
 the cross-section of the upper combustion chamber is less than the cross section of the lower combustion chamber. 
   
     
     
         3 . The combustion chamber of  claim 2 , further comprising
 a funnel structure for mating the cross-sections of the upper and lower combustion chambers.   
     
     
         4 . The combustion chamber of  claim 3 , wherein the funnel structure is substantially linear. 
     
     
         5 . The combustion chamber of  claim 3 , wherein the funnel structure is substantially curvi-linear. 
     
     
         6 . The combustion chamber of  claim 3 , wherein the funnel structure aids in redirecting radiant heat back to the fuel bed. 
     
     
         7 . The combustion chamber of  claim 2 , wherein the lower combustion chamber is round. 
     
     
         8 . The combustion chamber of  claim 2 , further comprising a slab and a slab cap. 
     
     
         9 . The combustion chamber of  claim 8 , wherein the slab and slab cap partly shield the air flow apertures from direct view of some of the fuel positioned in the bed. 
     
     
         10 . The combustion chamber of  claim 8 , wherein the slab cap further comprises a lip and flange for aiding in shielding the apertures from direct view of fuel positioned in the fuel bed. 
     
     
         11 . The combustion chamber of  claim 8 , wherein the slab and slab cap aid in shielding the apertures from direct line of sight of a combustion chamber outlet. 
     
     
         12 . The combustion chamber of  claim 2 , wherein the orifice ring is positioned within the bottom one-third of the upper combustion chamber. 
     
     
         13 . The combustion chamber of  claim 2 , wherein the orifice ring is positioned at the top of the lower combustion chamber. 
     
     
         14 . The combustion chamber of  claim 4 , wherein the funnel structure is contiguous with the upper combustion chamber. 
     
     
         15 . The combustion chamber of  claim 4 , wherein the funnel structure is contiguous with the lower combustion chamber. 
     
     
         16 . The combustion chamber of  claim 2 , wherein
 the combustion chamber defines walls made of a corrosion resistant alloy metal.   
     
     
         17 . The combustion chamber of  claim 1 , wherein the combustion chamber walls and orifice ring are made of a corrosion resistant alloy metal. 
     
     
         18 . The combustion chamber of  claim 1 , wherein the orifice ring is a structure independent of the upper combustion chamber wall. 
     
     
         19 . The combustion chamber of  claim 1 , wherein the orifice ring is a constriction in the upper combustion chamber wall. 
     
     
         20 . The combustion chamber of  claim 1 , further comprising
 a funnel structure for mating the cross-sections of the upper and lower combustion chambers, wherein the funnel structure aids in redirecting radiant heat toward the fuel.