BOOSTER SANDBLAST DEVICE Russian patent published in 2001 - IPC

FIELD: equipment for sandblast and shot- blast treatment can be used for removing high-strength surface layer of metals and natural building materials. SUBSTANCE: device is made of two-circuit chamber provided with two supersonic nozzles and branch-pipe as a booster. The outer annular nozzle provides rarefication along the axis. The inner nozzle supplies gas abrasive mixture to the rarefied zone. The perimeter of annular nozzle is provided with blades which deflect axial flow that provides reduced pressure downstream the nozzle across the diameter and along whole length as well. The gas abrasive mixture enters the negative pressure space though center nozzle. The gas abrasive mixture is formed into elastic supersonic flow at the nozzle exit section. The flow is of enhanced kinetic energy when striking against a barrier provides removing of the strength surface layer. EFFECT: improved design. 1 dwg