| 摘要 |
PROBLEM TO BE SOLVED: To provide a dredge pump, using high-pressure high-speed steam as a jet water stream by reducing entanglement and clogging to eliminate cavitation, suppressing shortening of life due to abrasion of an impeller and a casing, decreasing limitation on material to be pumped and run down, reducing the shape and weight of the apparatus, enabling work at a large depth of water, decreasing the generation of electric danger, and enabling work even if the pump is buried in the mud and gravel to reduce the time and trouble for spraying a coagulating sedimentation agent. SOLUTION: First a high-speed water stream is jetted into a running-down pipe to generate negative pressure, and air is sucked from the tip of a jet nozzle utilizing the negative pressure of the jet water stream. Secondly the jet nozzle is provided at an angle to the axis of the running-down pipe, and disposed in the circumference of the running-down pipe at its straight part. Thirdly the coagulating sedimentation agent is suitably mixed with a negative pressure generated water stream using a volumetric feeder. COPYRIGHT: (C)2005,JPO&NCIPI
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