Post-mixed oxy-fuel gas cutting torch and nozzle and method of oxy-fuel gas cutting
AssigneeUnion Carbide Corporation
InventorRonald E. Fuhrhop
Life of this patent
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Abstract
A combination cutting torch and nozzle assembly for post-mix oxy-fuel gas cutting using two separate annular steams of preheat oxygen gas surrounding the fuel gas stream with the inner annular oxygen stream directed to impinge the fuel gas stream very close to the point of discharge from the nozzle assembly. The nozzle assembly is secured to the torch head of the cutting torch by a hollow retaining nut which forms an annular gap with the nozzle assembly for discharging the outer preheat oxygen gas stream.
Claims7
In combination, an oxy-fuel gas cutting torch having a torch head, a post-mix nozzle assembly and a hollow retaining nut for coupling said nozzle assembly to said torch head and for forming a gas passageway between said nozzle assembly and the hollow interior of said retaining nut, said nozzle assembly comprising a nozzle having a central bore of predetermined geometry through which cutting oxygen gas is passed;
- a first and second set of discharge orifices extending through said nozzle and terminating in a number of exit openings arranged in an outer and inner concentric ring about said central bore, with said first set of discharge orifices connected to a conduit through which a supply of fuel gas is passed for discharge through said inner ring of exit openings;
- means for passing oxygen gas through said second set of discharge orifices and means connecting said gas passageway between said nozzle and said retaining nut to said second set of discharge orifices for supplying oxygen gas through said gas passageway.
A method of oxy-fuel gas cutting using a cutting torch having a torch head and nozzle assembly for mixing fuel gas and oxygen external of the torch comprising the steps of supplying a cutting stream of oxygen through a central opening extending through said nozzle assembly;
- discharging fuel gas from said nozzle assembly through a first set of discharge orifices surrounding said central opening;
- discharging oxygen from said nozzle assembly through a second set of discharge orifices to form a first preheat annular stream of oxygen about said fuel gas stream and discharging oxygen from another gas discharge orifice to form a second preheat annular stream of oxygen surrounding said first preheat annular stream of oxygen with said first preheat annular stream being fed through said second set of discharge orifices at an angle of between 2 to 20 degrees relative to the longitudinal axis of the cutting torch so as to impinge said fuel gas stream very close to the point of discharge from said nozzle assembly.
Dependencies are inferred from the claim text.