Gas jet nozzle

A gas jet nozzle for jetting high-pressure gas from a high-pressure gas reservoir, the nozzle having a front and back and comprising:

• an inner nozzle with a jet port for jetting high-pressure gas by communicating with the gas reservoir, the inner nozzle having an outer peripheral surface and an axis;
• an outer nozzle with a jet passage, bounded by an inner peripheral surface, for directing to a target the gas jetted from the jet port and jetting the directed gas from a front end of the jet passage,
• the outer nozzle having a tapered bore portion bounding a part of the jet passage;
• and
• an air suction part for sucking atmospheric air into the gas jetted from the jet port,
• the jet port on the inner nozzle residing within the tapered bore portion so as to cause jetted gas from the jet port to be accelerated at the tapered bore portion,
• wherein a plurality of radial fitting plates are formed on the outer peripheral surface of the inner nozzle,
• the fitting plates engaging with the inner peripheral surface of the outer nozzle and spaced at intervals around the axis of the inner nozzle,
• a rear end of the outer nozzle functioning as an air intake port of the air suction part, through which atmospheric air can be sucked,
• the sucked air flowing through the spaces between the fitting plates to and through the front end of the jet passage.