| 摘要 |
<p>This disclosure relates to an apparatus for producing hot gases which may be advantageously utilized in the shrinking of plastic foils although it is readily useable in other environments. The apparatus utilizes a radial blower which produces an annular twisting current of air within a guide pipe with there being mounted within the interior of the air current means for supplying jets of a fuel gas and ignition means for periodically igniting the jets of fuel gas in a manner wherein ignition of the fuel gas is assured and complete combustion thereof is effected within the apparatus so that the possibility of explosions is eliminated and the hot gases discharging from the apparatus are free of flame. The flow of air currents also provides an insulating boundary layer which maintains the exterior of the apparatus at a temperature only slightly greater than ambient temperature.</p> |
