| 摘要 |
PURPOSE: To provide a production device for a glass preform capable of increasing the sticking efficiency of glass fine particles to a rod shaped member by forming inclined parts toward the rear exhausting direction at the upper and lower walls of a chamber and making the chamber transferrable so as to keep distances between the inclined parts and stuck and accumulated glass fine particles constant. CONSTITUTION: This production device for a glass preform is a device for sticking and accumulating glass fine particles around a rod shaped member, and an upper wall 10a and a lower wall 12a of its chamber 10 base inclined parts 10b and 12b respectivley in the exhaust direction. An opening 5 at a front wall 10c and a burner 3 for generating glass fine particles in the center are formed. A wall 10d at the exhaust side is provided with an opening 6 and an exhausting pipe 40 having bellows 40a. The chamber 10 is transferred to the arrow marked direction as the amount of stuck and accumulated glass fine particles on the rod shaped member 2 increases, and also the rod shaped member is transferred to the same direction as the diameter of a glass fine particle body 2a increases. A driving pressure by a gas flow and a raw material gas burner flame 3a becomes constant to increase the sticking efficiency by adjusting the both transferring speeds to keep a distance (r) at a constantly held state. |
