JET PUMP AND NEGATIVE PRESSURE FORMING METHOD BY MEANS OF COMPOSITE JET FLOW TYPE JET PUMP

摘要

PROBLEM TO BE SOLVED: To provide a jet pump and a negative pressure forming method by means of a composite jet flow type jet pump capable of stably forming a negative pressure for an operation for sucking particle bodies including snow and solid lumps which are easily attached and deposited and capable of improving the efficiency of various kinds of operations without preventing miniaturization of a multi-nozzle type jet pump.;SOLUTION: High-pressure water supplied from a high-pressure water supply source is injected from both injection ports of a main injection port 11 for forming a straight jet flow of which the center axis is arranged on a center axial line of a negative pressure forming pipe 4, and an auxiliary injection port having auxiliary injection ports 12 to 17 arranged so as to be differentiated by a prescribed angle with respect to the center axial line of the negative pressure forming pipe in order that the injected jet flow forms a swirl jet flow on an inner circumferential surface-closer part of the pressure forming pipe, to the negative pressure forming pipe. The straight jet flow is formed on a center side part of the negative pressure forming pipe and the swirl jet flow is formed on the inner circumferential surface-closer part of the negative pressure forming pipe. Both jet flows are combined to form a virtual piston and, thereby, a negative pressure is formed on a jet flow upper side part of the negative pressure forming pipe.;COPYRIGHT: (C)2014,JPO&INPIT