Patent ID: 8291708

Claim:
A variable dual fuel nozzle apparatus, comprising: a duct having one side for introducing a gas and the other side for discharging the gas; a plurality of swirling members which are arranged at the other side of the duct in a radial shape with respect to a center of the duct and include a first jetting member; wherein the first jetting member includes a plurality of first jetting holes for jetting a first fuel; a switching member which is installed inside at least one of the swirling members and includes first holes and second holes corresponding to the first jetting holes; and a driving unit connected to one end of the switching member via a wire to pull the switching member towards a radially inward direction, wherein the driving unit includes; a rack gear connected to an opposite end of the wire to apply tension to the wire along with movement; and a spur gear coupled to the rack gear to move the rack gear by rotation, wherein positions of the first holes and second holes of the switching member move, and opening diameters of the plurality of first jetting holes vary by movement of the first holes and second holes of the switching member, when the switching member moves radially inward via the wire, by the driving unit.