公开(公告)号：US20230286109A1

公开(公告)日：2023-09-14

申请号：US18018557

申请日：2021-07-29

Applicant: BLASTONE TECHNOLOGY PTY LTD

Inventor： Matthew ROWLAND ,  Joshua KEEP ,  Ingo JAHN

IPC: B24C5/04 ,  B05B7/14 ,  B05B15/18

CPC classification number: B24C5/04 ,  B05B7/1486 ,  B05B15/18

Abstract: a blast nozzle is provided that has a conduit through it for accelerating air applied to the blast nozzle at pressure greater than ambient pressure. The air contains abrasive particles for abrading or “blasting” a workpiece. The conduit includes an inlet portion that converges from an inlet opening for receiving the air, to a throat for accelerating the air to a sonic speed. The conduit also includes an outlet portion that extends from the throat to a nozzle outlet for accelerating the air from the throat to a super-sonic speed at the nozzle outlet. A ratio of area of the nozzle outlet to area of the throat is selected for expansion of the air through the conduit so that air is emitted from the nozzle outlet in a jet at an ambient pressure. The jet imparts drag on the abrasive particles between the nozzle outlet and the workpiece which has been found to improve abrading of the workpiece by the abrasive particles.