| 摘要 |
A fluid discharge apparatus adapted to discharge a cavitating stream of pressurized liquid along with the selective discharge of a secondary material, such as sand, for removing dirt, debris, barnacles, marine growth, and other substances from surfaces is provided. More particularly, the invention contemplates a secondary hose inlet and nozzle outlet for discharging abrasive material, such as silica, to improve cleaning effectiveness. The combination of a secondary fluid or abrasive substance with the gas bubbles within the cavitating liquid stream that essentially explode upon impacting debris resulting in tremendous pressure fluxuations provides improved effectiveness in removing debris and aquatic growth from the submerged surface. The invention further improves upon the control of such devices with controls that allow the diver/operator to adjust flow rates and thrust without releasing his grasp. An improved hand-held apparatus is disclosed with a pistol grip and trigger actuator, and an improved wheeled vehicle is disclosed with improved control handles adapted to actuate valves and closure ports.
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