Patent ID: 7090568

Claim:
A blasting device for cleaning surfaces of hollow areas by means of a jet stream comprising a conveying medium and particles of a blasting agent added to the conveying medium, which comprises: (a) a twisting chamber having a cylindrical shape; (b) a tangential inlet leading into the twisting chamber for admitting the conveying medium and the blasting agent, the conveying medium and the blasting agent being introduced into the twisting chamber entirely through said tangential inlet; (c) a nozzle part conically tapering at an angle of 10° to 25° leading out of the twisting chamber, the jet stream exiting the nozzle part as a flow of blasting agent and conveying medium; and (d) an oblong, cylindrical displacement body coaxially arranged in the twisting chamber; wherein the twisting chamber provides the jet stream with a controlled twist and the entire flow of blasting agent and conveying medium exiting the nozzle part is introduced into the twisting chamber through the tangential inlet.