Furnace gas feeding device, optical fiber production device, and optical fiber production method

A furnace gas supply apparatus configured to supply gas into a drawing furnace, comprising:

• a first flow channel introducing gas from a predetermined first gas inlet and to flow the gas from a predetermined first gas outlet toward a gas storage portion;
• and
• a second flow channel introducing the gas stored in the gas storage portion from a predetermined second gas inlet to flow the gas from a predetermined second gas outlet toward a furnace core tube of the drawing furnace, the gas storage portion is provided between the predetermined first gas outlet and the predetermined second gas inlet, and an opening position of the predetermined second gas inlet is provided at a position different from an opening position of the predetermined first gas outlet,
• wherein the first flow channel includes a plurality of first flow channels, the second flow channel includes a plurality of second flow channels, and a number of the plurality of first flow channels is larger than a number of the plurality of second flow channels, all of the first flow channels of the plurality of first flow channels have a predetermined first gas inlet and a predetermined first gas outlet, and all of the second flow channels of the plurality of second flow channels have a predetermined second gas inlet and a predetermined second gas outlet, and
• wherein the predetermined second gas inlet of all of the second flow channels of the plurality of second flow channels is provided at a position not opposing the predetermined first gas outlet of all of the first flow channels of the plurality of first flow channels.