| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a gas nozzle device for a burner capable of preventing insufficient suction of primary air caused by lowering of a gas jetting speed from nozzle holes in reducing heat to low, and improving heat reducing performance as much as possible. Ž<P>SOLUTION: The plurality of nozzle holes 4<SB>1</SB>, 4<SB>2</SB>, 4<SB>3</SB>are formed on a tip section of a nozzle body 3, and a fuel gas is individually supplied to the nozzle holes 4<SB>1</SB>, 4<SB>2</SB>, 4<SB>3</SB>through branched gas passages 6<SB>1</SB>, 6<SB>2</SB>, 6<SB>3</SB>branched from a common gas supply passage 5. Opening/closing valves 10 are disposed in the branched gas passages 6<SB>2</SB>, 6<SB>3</SB>excluding prescribed one branched gas passage 6<SB>1</SB>of the branched gas passages. The opening/closing valves 10 are closed according to reduction of supply of the fuel gas to reduce the total effective opening area of the nozzle holes. Further needles movable forward and backward toward the nozzle holes may be disposed in the nozzle body, so that the needles are moved forward to a nozzle hole side according to the reduction of supply of the fuel gas to reduce the effective opening area of the nozzle holes. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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