以乙炔气(C_2H_2)作为可燃气体的火焰切割嘴,至今仍在广泛地使用。由于乙炔气的燃烧速度较快,因此要求割嘴的混合燃气孔道,在一定条件下应形成较快的燃气流速,来适应其燃烧速度较快的特点,当两者相等时,才能建立稳定的燃烧区域。目前,国内各专业工具厂所生产的乙炔割嘴,就其混合气体出口截面的形状而言,一般只 Flame cutting nozzle using acetylene gas (C_2H_2) as combustible gas is still widely used. Because acetylene gas combustion speed is faster, so require cutting nozzle mixed gas channels, under certain conditions should be formed faster gas flow rate, to adapt to its faster burning characteristics, when the two are equal, to establish a stable Burning area. At present, the domestic acetylene cutting tools produced by professional tool factory, in terms of the shape of the outlet cross-section of the mixed gas, generally only