| 摘要 |
A cutting torch 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, a mixing oxygen valve and passageway, a fuel gas valve and passageway, a head having a tip end 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 drilled from the oxygen passageway end and in alignment with the oxygen passageway and intersecting a second oxygen passageway drilled from the tip end of the head and with a first diameter; a third fuel passageway drilled from the fuel passageway end and in alignment with the fuel passageway end and intersecting a fourth fuel and oxygen passageway 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 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 sustantially uniform admixing of the fuel and oxygen before entering the tip end. Preferably the oxygen passageway has a copper spiral adjacent the first oxygen passageway for preventing flashback.
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