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A power gas burner of the gun type. The burner embodies an air tube that is mounted on the appliance with which the burner is to be used. Primary and secondary air is supplied to the air tube by a blower of the turbo-compressor type that is driven by a motor through an adjustable speed drive. Fuel g

A power gas burner of the gun type. The burner embodies an air tube that is mounted on the appliance with which the burner is to be used. Primary and secondary air is supplied to the air tube by a blower of the turbo-compressor type that is driven by a motor through an adjustable speed drive. Fuel gas is supplied to the air tube through an eductor tube. Gas is supplied to the eductor at regulated pressure through a metering orifice. The discharge end of the eductor is open and is located on the axis of the air tube and in the throat of a venturi that is also mounted on the axis of the air tube. Air supplied by the blower flows at high velocity through the throat of the venturi on the exterior of the eductor, resulting in a reduction in pressure in the venturi at the discharge end of the eductor. This primary air is mixed in the venturi with gas discharged from the eductor. A flame retention burner head is disposed at the discharge end of the air tube and the mixture of primary air and gas is discharged through the center of the burner head. Secondary air flows around the venturi in the air tube and is discharged through the outer portions of the burner head. A spark igniter is provided for igniting the primary air-fuel mixture near the burner head. The flame propagates outwardly, mixing with the secondary air downstream of the burner head.

대표청구항 ▼

A power fuel gas burner comprising: an air tube having an inlet end and a discharge end, a venturi disposed within and coaxial with the air tube, the venturi having an entry portion of lesser diameter than the internal diameter of the air tube, the entry portion of the venturi tapering to a throat o

A power fuel gas burner comprising: an air tube having an inlet end and a discharge end, a venturi disposed within and coaxial with the air tube, the venturi having an entry portion of lesser diameter than the internal diameter of the air tube, the entry portion of the venturi tapering to a throat of reduced diameter as compared to the entry portion thereof, and a discharge end disposed near the discharge end of the air tube, an eductor tube for supplying fuel gas to the burner, said eductor tube having an open discharge end concentric with the venturi and disposed in the throat of the venturi, said eductor tube having an inlet end that is disposed outside of the air tube, means for supplying fuel gas to the inlet end of the eductor tube, said means including a pressure regulator and a removable and replaceable orifice plate interposed between said pressure regulator and said educator tube and located outside of said air tube, said orifice plate defining a metering orifice for controlling the rate of flow of fuel gas into the eductor tube, the cross-sectional area of the metering orifice being small as compared to the cross-sectional area of the open discharge end of the eductor tube, whereby the velocity of the fuel gas as it is discharged from the eductor tube is greatly reduced as compared to the velocity of the fuel gas as it is discharged from the metering orifice into the eductor tube, the fuel gas so supplied being discharged from the open discharge end of the eductor tube within the venturi, a turbo compressor-type blower for supplying air under greater than atmospheric pressure to the entry end of the air tube, a portion of the air supplied to the air tube by said blower flowing through the venturi and constituting primary combustion air, and the remaining portion flowing outside the venturi and constituting secondary air, the velocity of flow of air within the venturi being increased in the throat of the venturi and adjacent the open end of the educator tube whereby the pressure of the air adjacent said end of the eductor tube is reduced as compared to the pressure of air supplied to the air tube, the fuel gas supplied to the eductor tube being discharged through the open end thereof into this zone of reduced pressure and being mixed with the primary air supplied to the venturi, the mixture of fuel gas and primary air being discharged from the discharge end of the venturi, means immediately adjacent the discharge end of the venturi for igniting the mixture of primary air and fuel gas discharged from the venturi, and means including a flame retention head for mixing the mixture of primary air and fuel gas discharged from the venturi with said secondary air downstream from the discharge end of the venturi, said flame retention head having a frusto-conical shape and a central opening that is coaxial with the discharge end of the venturi, said opening being disposed upstream of the circumferential portion thereof that is secured to said air tube, said discharge end of said venturi being secured to the edge of said opening in the flame retention head.