Method and device for generating a two-phase gas-particle jet, in particular containing CO2 dry ice particles

摘要

The present invention relates to a method and a device for generating a two-phase gas-particle jet for treating surfaces by means of particles, in particular CO₂ dry ice particles (22), using a two-phase gas-particle jet. To this end, the CO₂ dry ice particles (22) are fed with a, tangential flow to a blasting chamber (30) in such a manner that the CO₂ dry ice particles (22) are forced into a rotational movement about an axis of flow (50), the angular velocity of this rotational movement then being increased in the direction of flow by means of a blasting nozzle (40), so that maximum speeds occur in the blasting-nozzle outlet (42). The two-phase gas-particle jet emerging from the blasting-nozzle outlet (42) is formed in such a way that the solid-phase CO₂ dry ice particles (22) are arranged in a uniform ring shape with an enlarged external diameter. The invention achieves in particular a considerable rise in the surface power when cleaning surfaces by means of CO₂ dry ice particles (22).