Wood and oil burning furnace

Claim 2

A furnace for burning both wood logs and fluid fuel, comprising: enclosure means defining an elongate combustion chamber including a lower portion defining a fire pit to confine fuel logs during burning thereof, and also including an upper portion in which gas-carried combustibles may be burned, there being a combustion gases outlet adjacent the top of the chamber; the enclosure means also having an elongate side wall extending along the elongate combustion chamber, there being an entrance port through said side wall and located midway between the ends of the combustion chamber and adjacent the upper portion of the combustion chamber; a baffle plate extending the full length of the combustion chamber and generally horizontally outwardly from said wall and across a significant portion of the combustion chamber at a location well above the entrance port, said baffle plate having an edge cooperating with the enclosure means to define an elongate combustion gases discharge passage across from and above the entrance port; a fluid fuel fired burner and a mounting therefor and directing a fluid fueled flame through said entrance port and in a direction transversely across the upper portion of said combustion chamber and intermediate the ends thereof; an elongate and linear air supply and distributing tube in the upper portion of the combustion chamber and above said entrance port, said tube extending along and closely adjacent the edge of the baffle plate and extending longitudinally of the combustion chamber and substantially from front to back thereof, said tube having a plurality of air discharge ports along its length and oriented and directing air downwardly and away from said entrance port and transversely across said discharge passage to supply combustion air to all of the gases traversing the discharge passage and to cooperate with said fluid fueled flame from the burner in producing cyclonic turbulence at both ends of the combustion chamber and downwardly into the fire pit for inducing accelerated burning of the logs in the fire pit and complete combustion of the gas-carried combustibles in the upper portion of the combustion chamber; and means inducing flow of air in the supply tube.

Claim 3

The invention according to claim 1 and including means of preheating the air supplied to said supply tube and utilizing heat from combustion in the combustion chamber for preheating such air.

Claim 4

A furnace for burning both wood logs and fluid fuel, comprising: enclosure means defining an elongate combustion chamber including a lower portion defining a fire pit to confine fuel logs during burning thereof, and also including an upper portion in which gas-carried combustibles may be burned, there being a combustion gases outlet adjacent the top of the chamber the enclosure means also having an elongate side wall extending along the elongate combustion chamber, there being an entrance port through said side wall and located intermediate the ends thereof and adjacent the upper portion of the combustion chamber; a fluid fuel fired burner and a mounting therefor and directing a fluid fueled flame through said entrance port and in a direction transversely across the upper portion of said combustion chamber and intermediate the ends thereof; an elongate air supply and distributing tube in the upper portion of the combustion chamber and above said entrance port, said tube having a plurality of air discharge ports along its length and oriented and directing air downwardly and away from said entrance port to cooperate with said fluid fueled flame from the burner in producing cyclonic turbulence at both ends of the combustion chamber and downwardly into the fire pit for inducing accelerated burning of the logs in the fire pit and complete combustion of the gas-carried combustibles in the upper portion of the combustion chamber; means inducing flow of air in the supply tube; a baffle plate extending the full length of the combustion chamber and generally horizontally outwardly from said wall and across a significant portion of the combustion chamber, said baffle plate having an edge cooperating with the enclosure means to define a combustion gases discharge passage, and the edge of said plate being disposed adjacent said air supply tube, said tube directing air from said discharge ports transversely across said passage to supply combustion air to all of the gases traversing said passage; and two additional elongate air supply tubes respectively disposed at opposite sides of the combustion chamber and extending longitudinally thereof throughout substantially the entire length of the elongate combustion chamber and adjacent the upper edge of the fire pit, said additional tubes directing air transversely across the combustion chamber and contributing secondary air and turbulence within the combustion chamber.

Claim 5

A furnace for burning both wood logs and fluid fuel, comprising: enclosure means defining an elongate combustion chamber including a lower portion defining a fire pit to confine fuel logs during burning thereof, and also including an upper portion in which gas-carried combustibles may be burned, there being a combustion gases outlet adjacent the top of the chamber the enclosure means also having an elongate side wall extending along the elongate combustion chamber, there being an entrance port through said side wall and located intermediate the ends thereof and adjacent the upper portion of the combustion chamber; a fluid fuel fired burner and a mounting therefor and directing a fluid fueled flame through said entrance port and in a direction transversely across the upper portion of said combustion chamber and intermediate the ends thereof; an elongate air supply and distributing tube in the upper portion of the combustion chamber and above said entrance port, said tube having a plurality of air discharge ports along its length and oriented and directing air downwardly and away from said entrance port to cooperate with said fluid fueled flame from the burner in producing cyclonic turbulence at both ends of the combustion chamber and downwardly into the fire pit for inducing accelerated burning of the logs in the fire pit and complete combustion of the gas-carried combustibles in the upper portion of the combustion chamber; means inducing flow of air in the supply tube; a baffle plate extending the full length of the combustion chamber and generally horizontally outwardly from said wall and across a significant portion of the combustion chamber, said baffle plate having an edge cooperating with the enclosure means to define a combustion gases discharge passage, and the edge of said plate being disposed adjacent said air supply tube, said tube directing air from said discharge ports transversely across said passage to supply combustion air to all of the gases traversing said passage; and two additional elongate air supply tubes respectively disposed at opposite sides of the combustion chamber and extending longitudinally thereof throughout substantially the entire length of the elongate combustion chamber and adjacent the upper edge of the fire pit, said additional tubes directing air transversely across the combustion chamber and contributing secondary air and turbulence within the combustion chamber.