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

US6695686B1 · kind B1 · utility

Assignee

• L'Air Liquide, Société Anonyme à Directoire et Conseil de Surveillance pour l'Étude et l'Exploitation des Procédés Georges Claude · FR

Inventors

• Hans Frohlich · Bissersheim, DE
• Sabine Gebhardt · Dörentrup, DE
• Berthold Trampusch · Solingen, DE

Key dates

• Filing date: Dec 4, 2000
• Grant date: Feb 24, 2004
• Expiry date: Dec 4, 2020

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B24C1/003
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

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).