Patent ID: 7494073

Claim:
A hydrodynamic cleaning apparatus for removing debris from submerged surfaces using a pressurized fluid stream having cavitating flow characteristics, said apparatus comprising: a body having a first inlet for receiving a liquid under pressure; means for regulating the flow rate of said liquid between a minimum and maximum flow rate; means for creating a cavitating flow state in said liquid; said means for creating a cavitating flow state in said liquid includes a housing defining a cavitation generating chamber and a center body disposed within said chamber, said chamber bounded by an outer wall including, in the direction of flow, a first section defined by a converging wall, a second section defined by constant diameter wall of a first diameter, a third section defined by a constant diameter wall of a second diameter, with said second diameter being larger than said first diameter so as to from an expanded cavity, and a forth section defined by diverging wall terminating in an outlet for discharging a cavitating stream of liquid; and means for generating thrust by discharging at least a portion of said liquid.