US 8,025,048 B1Granted

Portable outdoors heater

OwnerDavid E. Scarboroughinventor

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Abstract

The portable out door heater burns fuel such as propane from a pressurized gas fuel tank. The fuel enters an entrainment tube through a nozzle orifice that is coaxial with the cylindrical entrainment tube axis. Air enters the entrainment through air entry apertures and is entrained with the high velocity fuel stream. The air and fuel mixture passes from the entrainment tube into a coaxial cylindrical burner supply tube. The supply tube has a smaller diameter to accelerate movement of the air and fuel mixture. A cylindrical combustion chamber receives the air fuel mixture moving tangentially to the combustion chamber inside wall. A ring inside the chamber retards movement of the fuel charge. The fuel oxidizes at a temperature that reduces odors and converts carbon monoxide to carbon dioxide. The products of combustion pass through a silencer and into an area to be heated. A choke and igniter initiate combustion.

Claims11

Dependent claims

A portable outdoor heater comprising:

an inlet gas line adapted to be connected to a pressurized gas fuel tank, an adjustable fuel flow rate control valve couple to the inlet gas line that controls the flow of gas from the pressurized gas fuel tank, and a gas nozzle in a discharge end of the inlet gas line;
an entrainment tube with an entrainment tube axis, an inlet end fitted with a choke, an air entrainment section with a plurality of air entry apertures, a gas and air mixing section and a mixed gas and air discharge end;
a nozzle support in the inlet end of the entrainment tube that supports the gas nozzle with a nozzle orifice coaxial with the entrainment tube axis;
a burner supply tube fixed to the mixed gas and air discharge end of the entrainment tube, coaxial with the entrainment tube axis, and having a burner supply tube cross section area that is smaller than an entrainment tube cross section area;
an igniter extending into the burner supply tube;
a tubular combustion chamber attached to a supply tube discharge end of the burner supply tube to receive mixed gas and air from the burner supply tube tangentially to a tubular combustion chamber inside wall surface, and including a combustion chamber closed end, a combustion chamber discharge end, a ring member fixed to the combustion chamber inside wall surface between the burner supply tube discharge end and the combustion chamber discharge end, a central aperture through the ring member that is concentric with a tubular combustion chamber axis, a ring member surface facing toward the combustion chamber closed end and extending generally perpendicular to and away from the combustion chamber inside wall surface to the central aperture and wherein the ring member surface facing toward the combustion chamber closed end is spaced from and parallel to the entrainment tube axis;
wherein a mixture of gas and air discharged from the burner supply tube is guided by the tubular combustion chamber inside wall surface and rotates around the tubular combustion chamber axis;
wherein a gas in the mixture of gas and air is held in the combustion chamber by the ring member surface facing toward the combustion chamber closed end until the gas is fully burned in the combustion chamber;
and
a silencer connected to the combustion chamber discharge end and including a silencer discharge passage that passes products of combustion into an area that is to be heated.

7 more elements

A portable outdoor heater comprising:

an inlet gas line adapted to be connected to a pressurized gas fuel tank, an adjustable fuel flow rate control valve in the inlet gas line that controls the flow of gas from the pressurized gas fuel tank, and a gas nozzle in a discharge end of the inlet gas line;
an entrainment tube with an entrainment tube axis, an inlet end, an air entrainment section with at least three air entry slots with slot long axes that are parallel to the entrainment tube axis, a gas and air mixing section and a mixed gas and air discharge end;
a nozzle support in the inlet end of the entrainment tube that supports the gas nozzle with a nozzle orifice coaxial with the entrainment tube axis;
a burner supply tube fixed to the mixed gas and air discharge end of the entrainment tube, coaxial with the entrainment tube axis and having a burner supply tube cross section area that is smaller than an entrainment tube cross section area;
a tubular combustion chamber attached to the burner supply tube to receive mixed gas and air, from the burner supply tube, tangentially to a tubular combustion chamber cylindrical inside wall surface, and including a combustion chamber closed end, a combustion chamber discharge end, and a ring member fixed to the combustion chamber cylindrical inside wall surface between the burner supply tube and the combustion chamber discharge end, and a central aperture through the ring member that is concentric with a tubular combustion chamber axis, wherein the ring member includes a ring surface that faces toward the combustion chamber closed end, the ring surface that faces toward the combustion chamber closed end is perpendicular to the tubular combustion chamber axis, and wherein the ring surface that faces toward the combustion chamber closed end is spaced from and parallel to the entrainment tube axis;
wherein a tube diameter length of the burner supply tube is less than a combustion chamber radius length of the tubular combustion chamber cylindrical inside wall surface;
a choke with a choke sleeve telescopically received on the inlet end of the entrainment tube and slidable relative to the entrainment tube between a position covering the at least three slots and a position in which the at least three air entry slots are uncovered for air entry;
an igniter extending into the burner supply tube;
and
a silencer connected to the combustion chamber discharge end and including a silencer discharge passage that passes products of combustion into an area that is to be heated.

7 more elements

A portable heater comprising:

an inlet gas line adapted to be connected to a pressurized gas fuel tank, an adjustable fuel flow rate control valve in the inlet gas line that controls the flow of gas from the pressurized fuel gas tank, and a gas nozzle in a discharge end of the inlet gas line;
an entrainment tube with an entrainment tube axis, an inlet end, an air entrainment section with at least one air entry aperture, a gas and air mixing section and a mixed gas and air discharge end;
a choke with a choke sleeve telescopically received on the inlet end of the entrainment tube and slidable relative to the entrainment tube between a position covering the air entry aperture of the entrainment tube and a position that uncovers the air entry apertures of the air entrainment tube;
a nozzle support in the inlet end of the entrainment tube that supports the gas nozzle with at least one nozzle orifice that is coaxial with the entrainment tube axis;
a burner supply tube fixed to the mixed gas and air discharge end of the entrainment tube, coaxial with the entrainment tube axis, and having a burner supply tube cross section area that is smaller than an entrainment tube cross section area;
an igniter extending into the burner supply tube;
and
a tubular combustion chamber attached to the burner supply tube to receive mixed gas and air from the burner supply tube tangentially to a tubular combustion chamber inside wall surface, and including a combustion chamber closed top end, a combustion chamber bottom discharge end, and a ring member fixed to the combustion chamber inside wall surface between the burner supply tube and the combustion chamber bottom discharge end, a central aperture through a top face the ring member that is concentric with a tubular combustion chamber axis, and wherein the ring member has top ring surface that faces toward the combustion chamber closed top end and the top ring surface is perpendicular to the tubular combustion chamber axis.

5 more elements

Dependencies are inferred from the claim text.