Barbecue oven and method of operation
View Patent ↗A barbecue oven that enables operator control of the combustion process through selective control of gas flow through and/or around a hot, oxygenated bed of coals and further enables automatic control of oven temperature through thermostatic regulation of forced draft.
1. A barbecue oven comprising:
a firebox comprising:
a charcoal tray disposed within a housing and having a first vent;
an upper chamber above the charcoal tray, configured to hold solid fuel and having a second vent and a third vent, the second vent configured to admit combustion air to the charcoal tray and the third vent configured to open and close; and
a lower chamber below the charcoal tray having a fourth vent configured to open and close, the lower chamber configured to collect ash;
a cooking chamber configured to hold meat and comprising a fifth vent and a sixth vent;
a passageway having a user-configurable inlet that comprises the third vent and the fourth vent and configured to direct gases received from one or more of the upper chamber and the lower chamber of the firebox to an outlet at the fifth vent configured to discharge the gases into the cooking chamber;
a forced draft device configured to cause flow from atmosphere, through the second vent in the upper chamber of the firebox to the firebox and through the third vent in the upper chamber and the fourth vent in the lower chamber, through the passageway and the fifth vent to the cooking chamber, and through the sixth vent in the cooking chamber back to atmosphere;
a first user-selectable valve coupled to the third vent; and
a second user-selectable valve coupled to the fourth vent.
2. The barbecue oven of claim 1 wherein the forced draft device is disposed in the vent in the cooking chamber.
3. The barbecue oven of claim 1 wherein the forced draft device comprises one or more of a fan, blower, or draft inducer.
4. The barbecue oven of claim 1 comprising a thermostat configured to sense the temperature in the cooking chamber and activate the forced draft device.
5. The barbecue oven of claim 1 wherein the passageway additionally comprises a second inlet configured to receive the gases from the upper chamber of the firebox and wherein activation of the forced draft device causes flow from the upper chamber of the firebox, through the passageway to the cooking chamber, bypassing the charcoal tray.
6. The barbecue oven of claim 5 wherein the passageway additionally comprises damper means of controlling flow through the inlets.
7. The barbecue oven of claim 1 wherein the passageway further comprises a first structure having a first user-configurable inlet to the upper chamber of the firebox, and a second user-configurable inlet to the lower chamber of the firebox.
8. The barbecue oven of claim 1 wherein the passageway further comprises a first structure directly coupled to a first inlet to the upper chamber of the firebox, and directly coupled to a second inlet to the lower chamber of the firebox.
9. The barbecue oven of claim 1 wherein the user-configurable inlet is configurable to simultaneously receive the gases from both of the upper chamber and the lower chamber of the firebox.
10. The barbecue oven of claim 1 wherein the user-configurable inlet is configurable to change a pressure differential across the charcoal tray.
11. The barbecue oven of claim 1 wherein the user-configurable inlet comprises a first inlet to the upper chamber of the firebox having a first vent closing device and a second inlet to the lower chamber of the firebox having a second vent closing device.
12. The barbecue oven of claim 1 wherein the user-configurable inlet comprises a first inlet having a first inlet control device and a second inlet having a second inlet control device.