DEVICE FOR UNDERWATER EXCAVATION Russian patent published in 2009 - IPC E02F3/88 

FIELD: construction, road engineering.

SUBSTANCE: invention is related to equipment for excavation, loosening and shifting of soil, in particular, to underwater soil-excavating devices intended for usage by dives during ship-raising underwater-technical and hydrotechnical works. Device for underwater excavation comprises serially connected drain nozzle for pulp removal, diffuser, mixing chamber with confusor and distribution chamber with nozzle for supply of working fluid. Device is equipped with jacket of working fluid supply connected to nozzle of working liquid supply, along perimeter of which hollow cylinders are installed, internal surface of which has threaded joints with active jet-directing nozzles. At that device is equipped with pipe for compressed air supply, and in mixing chamber in transverse plane along circumference holes are arranged, which communicate through annular jacket with pipe of compressed air supply. Internal surface of mixing chamber is arranged with alternating section, diametre of which is increased to the side of diffuser with creation of three ejection zones, and nozzle for supply of working fluid has tappings connected via ball valves to jacket of working liquid supply and with mentioned ejection zones in mixing chamber. Jet-directing nozzles are located at sharp angle to axis of confusor suction hole.

EFFECT: provision of ejection process control depending on soil type, increased convenience of operation during underwater excavation, increased velocity of pulp, lower abrasive wear of internal wall of mixing chamber.

3 dwg