| 摘要 |
<p>There is provided a burner for producing glass fine particles, including: a glass material gas discharge port (6); a combustible gas discharge port (8) that is provided so as to surround the glass material gas discharge port, a center of the combustible gas discharge port being positioned on a center of the glass material gas discharge port; and a plurality of small-diameter oxidizing gas discharge ports (7) that are provided within the combustible gas discharge port in one or more concentric circles with respect to the glass material gas discharge port. Here, small-diameter oxidizing gas discharge ports in a same circle have a same focus length, each of the plurality of small-diameter oxidizing gas discharge ports has: a gas introducing portion at which the small-diameter oxidizing gas discharge port branches from a common main tube; and a fastening portion that is positioned between the gas introducing portion and an end of the small-diameter oxidizing gas discharge port that is opposite to the gas introducing portion, and D 1 > D 3 and D 2 > D 3 when D 1 denotes an inner diameter of each of the plurality of small-diameter oxidizing gas discharge ports at the fastening portion, D 2 denotes the inner diameter of the small-diameter oxidizing gas discharge port at the gas introducing portion, and D 3 denotes the inner diameter of the small-diameter oxidizing gas discharge port at a different portion than the fastening portion and the gas introducing portion.</p> |
