초록 ▼

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

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.

대표청구항 ▼

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

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.