| 摘要 |
PROBLEM TO BE SOLVED: To provide a jet pump where the suction amount of fluid to be driven is improved, by suppressing the reduction in the speed of driving fluid at throat inlet and the M ratio of the jet pump and the efficiency of the jet pump. SOLUTION: The jet pump comprises a nozzle for blowing out the driving fluid, a bell-mouth for sucking the surrounding fluid to be driven with the driving fluid blown from the nozzle, a throat where the driving fluid mixes with the sucked fluid to be driven, and a diffuser for pressurizing and delivering the mixed fluid. A plurality of nozzles 31a and 31b are arranged concentrically on a nozzle pedestal 20 to which the nozzles are mounted. Each nozzle has nozzle straight pipe sections 32 and 34 and a plurality of nozzle throttle sections 33 and 35, where flow channel is throttled, and the nozzle throttle angleθ2 of the nozzle throttle section 35 close to a nozzle blowout port 40 of the nozzle is set larger than the nozzle throttle angleθ1 of the other nozzle throttle section. COPYRIGHT: (C)2009,JPO&INPIT
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