AERIAL CAVITATION JET GENERATING NOZZLE, DRILLING MACHINE WITH IT, AND DRILLING METHOD

摘要

PROBLEM TO BE SOLVED: To provide an aerial cavitation jet generating nozzle, a drilling device with it, and a drilling method increasing the destructing force per unit power and applicable to an execution section in a wide range by generating a stable aerial cavitation jet.;SOLUTION: This drilling device is provided with a tapered high-pressure water jet nozzle injecting high-pressure water and a low-pressure water jet nozzle provided to surround the high-pressure water jet nozzle, formed with a water chamber in which the lower-pressure water from a low-pressure water inlet flows, and formed with a contraction section having a contracted passage area on the outlet side of the water chamber.;COPYRIGHT: (C)2001,JPO