专利名称：HEAT GUN发明人：ZAGOROFF D,US申请号：US3779694D申请日：19711110公开号：US3779694A公开日：19731218
摘要：Hand held heat gun producing heated air in 250 DEG to 1,000 DEG F rangeemploys high performance internal combustion burner discharging exhaust gas atvelocity above 4,000 feet per minute and temperature on order to of stoichiometricburning temperature, i.e. 3,450 DEG F for propane fuel. High velocity exhaust gases entermixing zone preferably in a divergent manner and with perimeter of gas flow cross-section at least 25 percent greater than the perimeter of a circle of equal area, toprovide an extended gas-air interface The exhaust gas has a high volume pumping andmixing action upon ambient air, producing in a practical small distance a useful flow oftreating air at the desired temperature. Preferably the burner outlet is of elongatedform with decreasing cross-section towards outlet, e.g. a multiple legged outlet cross-section. Another form has a shower-head like series of small outlets, with diverging axes.Preferably a positioning means set a minimum distance between work piece and outlet,to ensure mixing. Where the exhaust gas stream is exposed to admission of increasing airalong the length, the positioning means sets the working temperature. Preferably ashield extends about the exhaust gas stream, preferably in the form of a tube with spacefor ambient air. With apertures along the tube length, the mass of air increases in massand decreases rapidly in temperature there along, so length sets discharge temperature.
With a closed wall tube the tube cross-section and its inlet in the vicinity of the burneroutlet defines the amount of ambient air entrained and thereby sets the dischargetemperature. Burners useful in this heat gun are of high capacity type with jet pump feed,pressure recovery passage and flame holder positioned at entry of fuel mixture into theburner chamber.
申请人：ZAGOROFF D,US
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