Portable gas-fired forced-draft heater
First Claim
1. Combustion apparatus for burning a gaseous fuel-air mixture and adapted for use within a surrounding high velocity air stream, the apparatus comprising(a) a fuel and air mixing nozzle assembly for mixing fuel supplied to the assembly with air, for creating an essentially entirely gaseous mixture of fuel and air, and for discharging that mixture along a discharge axis of the assembly to a combustion zone surrounded by the air stream, the assembly being adapted for connection to a source of fuel for supply of fuel from the source to the assembly, the assembly having a discharge end on said axis through which the mixture is discharged to the combustion zone, and(b) spaced upstream and downstream combustion zone shroud means disposed along said axis respectively upstream of and adjacent the nozzle assembly discharge end and at a location downstream of said assembly discharge end for creating in the combustion zone, during the existence of said air stream therepast, a region of relatively nonturbulent gas having a pressure higher than the pressure in said air stream and in which combustion of the fuel-air mixture can occur, the shroud means including plate means disposed substantially normal to the axis upstream and downstream of the discharge end of the nozzle assembly, the upstream shroud means including a cup-like shroud having a diameter greater than that of the nozzle assembly discharge end and disposed coaxially of the nozzle assembly discharge end upstream of said higher pressure region to be open toward the downstream shroud means, said shroud having walls substantially parallel to the axis, the shroud having a base comprised by said plate means between the walls thereof and apertures of selected size through the base adjacent the shroud walls,(c) the apparatus being characterized by the absence, between the upstream and downstream shroud means, of physical structure between the high velocity air stream and the region of relatively nonturbulent gas.
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Accused Products
Abstract
A portable gas-fired forced-draft heater has a burner assembly mounted in a tube coupled to the intake port of a motor-driven blower. The burner operates in a stream of high velocity air which flows past the burner to the blower. The burner includes shrouds which cooperate with a fuel and air mixing nozzle to enable fuel to be burned efficiently and reliably over a wide range of fuel flow rates to the burner. A flame stabilization surface is spaced appropriately from the nozzle to enable reliable ignition of the fuel-air mixture. A controlled portion of the warm gases passing through the blower is routed to a receptacle for a fuel container to maintain pressure in the container as the preferably liquefied gas fuel is consumed during operation of the heater.
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Citations
26 Claims
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1. Combustion apparatus for burning a gaseous fuel-air mixture and adapted for use within a surrounding high velocity air stream, the apparatus comprising
(a) a fuel and air mixing nozzle assembly for mixing fuel supplied to the assembly with air, for creating an essentially entirely gaseous mixture of fuel and air, and for discharging that mixture along a discharge axis of the assembly to a combustion zone surrounded by the air stream, the assembly being adapted for connection to a source of fuel for supply of fuel from the source to the assembly, the assembly having a discharge end on said axis through which the mixture is discharged to the combustion zone, and (b) spaced upstream and downstream combustion zone shroud means disposed along said axis respectively upstream of and adjacent the nozzle assembly discharge end and at a location downstream of said assembly discharge end for creating in the combustion zone, during the existence of said air stream therepast, a region of relatively nonturbulent gas having a pressure higher than the pressure in said air stream and in which combustion of the fuel-air mixture can occur, the shroud means including plate means disposed substantially normal to the axis upstream and downstream of the discharge end of the nozzle assembly, the upstream shroud means including a cup-like shroud having a diameter greater than that of the nozzle assembly discharge end and disposed coaxially of the nozzle assembly discharge end upstream of said higher pressure region to be open toward the downstream shroud means, said shroud having walls substantially parallel to the axis, the shroud having a base comprised by said plate means between the walls thereof and apertures of selected size through the base adjacent the shroud walls, (c) the apparatus being characterized by the absence, between the upstream and downstream shroud means, of physical structure between the high velocity air stream and the region of relatively nonturbulent gas.
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8. Combustion apparatus for burning a fuel-air mixture and adapted for use within a surrounding high velocity air stream, the apparatus comprising
(a) a fuel and air mixing nozzle assembly for mixing fuel supplied to the assembly with air, for creating an essentially entirely gaseous mixture of fuel and air, and for discharging that mixture along a discharge axis of the assembly to a combustion zone surrounded by the air stream, the assembly being adapted for connection to a source of fuel for supply of fuel from the source to the assembly, the assembly having a discharge end on said axis through which the mixture is discharged to the combustion zone, (b) spaced upstream and downstream combustion zone shroud means disposed along said axis respectively upstream of and adjacent the nozzle assembly discharge end and at a location downstream of said assembly discharge end for creating in the combustion zone, during the existence of said air stream therepast, a first region of relatively nonturbulent gas having a pressure higher than the pressure in said air stream and in which combustion of the fuel-air mixture can occur, the shroud means being disposed substantially normal to the axis upstream and downstream of the discharge end of the nozzle assembly, and (c) a back-pressuring surface disposed on the axis between the discharge end of the nozzle assembly and the downstream shroud means in a selected spatial relation to the nozzle assembly for defining, in cooperation with the nozzle assembly, a second region of fuel-air mixture within the first region and having a pressure higher than that in the first region.
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16. Combustion apparatus comprising:
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(a) tube means; (b) blower means for moving air through said tube means; (c) nozzle means for creating and discharging, in essentially gaseous form, a mixture of air and fuel, said nozzle means having a discharge end disposed in the tube means and facing downstream for discharge of the mixture in the direction in which air moves through the tube means past the nozzle means discharge end during operation of the blower means; (d) upstream and downstream shroud means disposed within said tube means and substantially coaxial with the nozzle means, said nozzle means discharge end being located between said upstream and downstream shroud means; (e) said shroud means having a cup-like shape which includes an open end and a base end, said open ends of said upstream and downstream shroud means facing one another; (f) means including said tube and shroud means defining in part, during operation of the blower means;
a relatively high pressure flame zone lying generally coaxially with said nozzle means, an annular region of relatively intermediate pressure gas surrounding said zone wherein said zone and region are located between said shroud means, an annular region of relatively low pressure surrounding said intermediate pressure region and located between said shroud means and said tube means;(g) the apparatus being characterized by the absence, between the upstream and downstream shroud means, of physical structure between said low and intermediate pressure regions. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification