Patent ID: 7442112

Claim:
A nozzle for spraying sublimable solid particles entrained in a gas for cleaning a surface, the nozzle comprising: a cleaning agent block producing a phase change in a cleaning agent that is introduced from a cleaning agent supply source, the cleaning agent changing phase to produce a snow containing the sublimable solid particles; a carrier gas block through which a carrier gas is introduced from a carrier gas supply source; a first heater for heating at least part of the carrier gas supplied from the carrier gas supply source; a nozzle block into which the cleaning agent snow is introduced from the cleaning agent block and including a venturi growing, by adiabatic expansion, the cleaning agent snow that passes through the venturi, passing a first part of the carrier gas introduced and mixing the first part of the carrier gas introduced from the carrier gas block with the cleaning agent snow, and spraying the cleaning agent snow grown onto a surface of an object; and an anti-frost passage surrounding the venturi and receiving a second part of the carrier gas introduced from the carrier gas block.