CUTTING TORCH HAVING INTEGRAL HEAD MIXER

摘要

A cutting torch (11) that obviates the tendency to have flashback and sustain burning yet have the inherent flexibility of injector type mixer torches, including a cutting oxygen valve and passageway (37), a mixing oxygen valve and passageway (41), a fuel gas valve and passageway (45), a head (27) having a tip end (29) and having passageways for cutting oxygen and fuel-oxygen mixture and having the improvement characterized by having the fuel-oxygen head passageway comprised of the first oxygen passageway (79) drilled from the oxygen passageway end and in alignment with the oxygen passageway and intersecting a second oxygen passageway (81) drilled from the tip end of the head and with a first diameter, a third fuel passageway (83) drilled from the fuel passageway end and in alignment with the fuel passageway end and intersecting a fourth fuel and oxygen passageway (85) drilled from the tip end in the head and communicating with the second oxygen passageway and having a common center line with the second oxygen passageway and having a second diameter larger than the first diameter such that the oxygen has a high velocity and aspirates the fuel from the third fuel passageway into the fourth passageway; and a fifth passageway (87) drilled from the tip end and having a common center line with said second and fourth passageway and having a third diameter larger than the second diameter of the fourth passageways so as to afford a low velocity region for substantially uniform admixing of the fuel and oxygen before entering the tip end. Preferably the oxygen passageway has a copper spiral (77) adjacent the first oxygen passageway for preventing flashback.