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US 4,206,743 AGranted
Heating apparatus
OwnerW. Wally Niemelainventor
Life of this patent
Estimating the term…
Abstract
A maximum efficiency stove or furnace for heating homes or other buildings. The stove includes a primary combustion area for burning a primary fuel, such as wood, and secondary combustion areas for burning the gases of combustion after they leave the primary combustion area. The combustion chambers and areas are at least partially surrounded by air heating enclosures through which ambient room air is forced, preferably by a fan, for heating. Air for sustaining combustion is preheated in a preheating chamber and fed through separate intakes to both the primary and secondary combustion areas. A single draft control is provided to control air flow through the preheating chamber and to simultaneously control the flow of preheated air to and through both said primary and secondary combustion air intakes.
Claims24
A heating stove or furnace comprising:
- a combustion enclosure having a primary combustion chamber for burning fuel and a secondary combustion area in fluid communication with said primary combustion chamber for receiving and further combusting the gases of combustion from said primary combustion chamber;
- an air heating enclosure at least partially surrounding said combustion enclosure for passing ambient air for heating;
- combustion air intake means for controlled admission of fresh, ambient air to said primary combustion chamber and said secondary combustion area, said combustion air intake means including means for preheating said fresh, ambient air prior to admission to said combustion chamber and area;
- an exhaust outlet at the rear of said stove or furnace for exhausting the products of combustion after passage through said secondary combustion area;
- ambient air intake means for admitting ambient air to said air heating enclosure;
- a heated air outlet for exhausting heated air from said air heating enclosure;
- means for inserting fuel in said primary combustion chamber;
- said secondary combustion area including first and second generally horizontally extending, secondary combustion passageways located vertically above said primary combustion chamber, said first secondary combustion passageway communicating with said primary combustion chamber at the top and rear of said primary chamber opposite said fuel inserting means and extending forwardly to the front of said stove or furnace into communication with said second combustion passageway which extends vertically over said first secondary passageway and rearwardly into communication with said exhaust outlet, said secondary passageways being separated from said primary chamber and one another by heat-conducting walls and having a combined length and size sufficient to allow ignition and burning of the gases of combustion from said primary combustion chamber prior to exhaustion through said exhaust outlet;
- said combustion air intake means for said secondary combustion area including an intake opening adjacent the junction between said primary combustion chamber and said first secondary combustion passageway to facilitate secondary combustion of said gases in said secondary passageways.
6 more elements
A heating stove or furnace for burning fuel and the gases of combustion produced by the burning fuel comprising:
- a combustion enclosure having a primary combustion chamber and a secondary combustion area extending over the top of and in fluid communication with said primary combustion chamber, said secondary combustion area having a length and size sufficient to allow ignition and burning of the gases of combustion from said primary combustion chamber therewithin prior to exhaustion from said secondary exhaust outlet;
- an air heating enclosure at least partially surrounding said combustion enclosure for passing ambient air for heating;
- ambient air intake and exhaust means for admitting ambient room air to and exhausting heated air from said air heating enclosure;
- at least one primary combustion air intake opening for admitting fresh air to said primary combustion chamber;
- at least one secondary combustion air intake opening for admitting fresh air to said secondary combustion area;
- common preheat means for simultaneously preheating ambient air and directing said preheated air to both said primary and secondary combustion air intakes, said preheat means including a fluid-tight air preheat chamber extending along one portion of said primary combustion chamber, a common, ambient air intake in said preheat chamber and draft control means having a draft control member movably secured over said ambient air intake for simultaneously controlling ambient air flow through said ambient air intake, said preheat means, and both said primary and secondary combustion air intakes;
- and
- means for inserting fuel into said primary combustion chamber.
5 more elements
A heating stove or furnace especially adapted for burning solid fuels such as wood comprising:
- a combustion enclosure for burning solid fuel therein;
- combustion air intake means at the rear of said stove or furnace for controlled admission of fresh, ambient air to said combustion enclosure including means for preheating said fresh, ambient air prior to admission to said combustion enclosure;
- a pair of air ducts, each duct extending from said combustion air intake means into said combustion enclosure along one of the bottom sides of said enclosure to the front of said stove or furnace, said ducts being closed along their tops, supporting a grate for supporting wood or other fuel to be burned thereover, and having a plurality of laterally directed openings for admitting air from under and along the sides of said grate and under and along the sides of fuel when burned in said combustion enclosure toward the center of said stove or furnace such that said air flows upwardly through and around the fuel;
- and
- an exhaust outlet for exhausting products of combustion from said combustion enclosure.
2 more elements
Dependencies are inferred from the claim text.