Burner for producing glass fine particle deposited body, and device and method for producing glass fine particle deposited body

A device for producing a glass fine particle deposited body, which produces the glass fine particle deposited body by depositing a glass fine particle on a starting rod disposed inside a reaction vessel, the device comprising:

• a wall portion that is disposed to be separated from the starting rod and includes a through hole through which a burner passes on a wall surface of the wall portion;
• a clean air supply portion that supplies clean air from an outside of the wall portion to an inside thereof;
• the burner that includes a metallic gas supply pipe as a main body of the burner, and a cover that covers the gas supply pipe and is formed to be integrated with the gas supply pipe;
• and
• a moving mechanism that retracts the burner as the glass fine particle deposited body grows,
• wherein a pipe for supplying raw material gas, oxyhydrogen gas, and seal gas is connected to the gas supply pipe of the burner, and
• the cover covers the gas supply pipe and a connection portion of the pipe connected to a side surface of the gas supply pipe with a predetermined length in an axial direction of the burner and a given constant outer diameter.

A method for producing a glass fine particle deposited body, which produces the glass fine particle deposited body by depositing a glass fine particle on a starting rod disposed inside a reaction vessel, the method comprising:

• providing a through hole through which a burner passes on a wall surface of a wall portion disposed to be separated from the starting rod, the burner being provided with a metallic gas supply pipe as a main body of the burner and a cover that covers the gas supply pipe in an integrated manner, a pipe for supplying raw material gas, oxyhydrogen gas, and seal gas to the gas supply pipe being connected to the gas supply pipe, the cover covering the gas supply pipe and a connection portion of the pipe connected to a side surface of the gas supply pipe with a predetermined length in an axial direction of the burner and a given constant outer diameter;
• retracting the burner while keeping a gap with the through hole a given constant length as the glass fine particle deposited body grows;
• and
• introducing clean air into the reaction vessel through the gap.