Patent ID: 7503354

Claim:
A powder filling nozzle used for filling up a container with a powder mixed with a gas and in a fluidized state, comprising: a tubular body having an opening for discharging the powder in the fluidized state into the container; and a gas separating unit disposed near the opening of the tubular body and allowing the gas delivered together with the powder in the tubular body to pass through the gas separating unit but not allowing the powder to pass through the gas separating unit, wherein the gas separating unit serves to set the opening in a plugged state by the powder separated from the gas, so that the delivery of the powder from the tubular body into the container is stopped, wherein the tubular body has a double pipe structure including a first tubular body and a second tubular body, the first tubular body being inserted into the second tubular body so that a gap between the two tubular bodies is formed as a gas delivery path, both ends of the second tubular body being fixed to the first tubular body so as to close the gap, the first tubular body serving as a delivery path which discharges the powder in the fluidized state fed from one opening of the first tubular body into the container through the other opening of the first tubular body, the gas separating unit including a first filter part which does not pass the powder therethrough but allows the gas to pass therethrough, the second tubular body having a gas exhausting port connected with an external gas suction unit, and the second tubular body having a function of discharging the gas, passing through the first filter part and being attracted to the first tubular body by operation of the external gas suction unit, from the gas exhausting port through the gas delivery path, and wherein the tubular body has a triple pipe structure including a third tubular body in addition to the first and second tubular bodies, the third tubular body having an inner diameter larger than an outer diameter of the second tubular body, the second tubular body being inserted into the third tubular body so that a gap between the second and third tubular bodies is formed as a second gas delivery path, both ends of the third tubular body being fixed to the second tubular body so as to close the gap between the second and third tubular bodies at both ends thereof, the third tubular body including a second filter part at an outer circumference thereof, the third tubular body having a second gas exhausting port connected with a second external gas suction unit, and the third tubular body having a function of attracting through the second filter part the gas, existing in the powder discharged into the container, by operation of the second gas suction unit, and having a function of discharging the gas, passing through the second delivery path between the second tubular body and the third tubular body, from the second gas exhausting port.