Blast nozzle for water injection and method of using same for blast cleaning solid surfaces
AssigneeChurch & Dwight Co., Inc.
InventorWilliam E. Spears, Jr.
Life of this patent
Estimating the term…
Abstract
To reduce dust and improve the productivity of wet blasting, a blast nozzle and a method of using same are provided for directing a stream of abrasive particles entrained in compressed air to a targeted surface and for injecting a pressurized water stream into the stream of abrasive particles at a point downstream of the orifice of the blast nozzle and in the expansion portion of the nozzle. At the injection point, the velocity of the entrained abrasive particles is substantially equivalent to the velocity of the injected water stream.
Claims16
An apparatus for directing a particulate abrasive against a targeted surface for cleaning contaminants therefrom, comprising:
- a blast nozzle having a longitudinal bore therethrough for accelerating a stream of abrasive particles in compressed air, said bore comprising an inlet for receiving said stream, a converging section immediately downstream of said inlet, an orifice downstream of said converging section and a diverging section downstream of said orifice, said diverging section leading to an outlet, and a water injection means for injecting a stream of pressurized water directly into the stream of abrasive particles and compressed air at a point downstream of said orifice and in said diverging section, said injection means injecting said water coaxially with said stream of abrasive particles and compressed air.
A process for blast cleaning a surface to remove contaminants therefrom comprising accelerating a stream of abrasive particles and compressed air through a blast nozzle, said blast nozzle comprising a longitudinal bore therethrough having an inlet, a converging section downstream of said inlet, an orifice downstream of said converging section and a diverging section downstream of said orifice leading to an outlet, injecting a pressurized water stream into said stream of abrasive particles and compressed air at a point downstream from said orifice and in said diverging section coaxially with the flow of said stream of abrasive particles and compressed air through said blast nozzle.
Dependencies are inferred from the claim text.