| 摘要 |
PURPOSE:To obtain a device which is excellent in its mud lifting capacity, by capacity of a small-sized pump, by installing a submarine sand pump provided with a rotary cutter, to a suction port of a sand dredger provided with a sand pump on board. CONSTITUTION:In a state that a suction pipe 4 is suspended in the water and a suction part 7 has been approximated to the bottom 17 of the water, when a sand pump 2 is turned by a marine engine 18, also a switch 16 is closed, and a submarine sand pump 10 provided with a cutter is turned, muddy water in the suction pipe 4 is pumped up by the sand pump 2. On the other hand, muddy water C absorbed from an inlet of the marine sand pump 10 with a cutter is jetted out toward a throad part 8 through a nozzle 13, whirling up sand A being in the proximity of an opening part 9 of the lower end of the suction part 7 by a rotary cutter 11 provided on the lower end of the submarine sand pump 10 with a cutter, and also muddy water B is lifted toward the suction pipe 4 from the opening part 9 of the lower end of the suction part 7 by a theory of a water jet pump. |
