| 摘要 |
A quartz glass burner characterized by having a multibranched-tube quartz glass nozzle made up of multiple tubules housed in a quartz glass outer tube, and by having an inner diameter of the outer tube contracted such that an inner diameter of a tip of the outer tube is between 0.65 and 0.90 times the inner diameter of a trunk of the outer tube. The nozzle is structured such that the region from the tubule branching portion to the tip thereof is housed in the outer tube. The outer tube housing the tubules has a length that is greater than or equal to 1.5 times the inner diameter of the tip of the outer tube. Therefore, there is provided a quartz glass burner that causes the flow velocity distribution of gas emitted from outer tube to be uniform at the tip of the burner, thereby enhancing glass microparticle deposition efficiency and also enhancing firepower during flame working. |
