| 摘要 |
PROBLEM TO BE SOLVED: To obtain a jet pump with a high pumping efficiency by preventing the leakage of the negative pressure without generating the energy loss of the liquid. SOLUTION: A leading-in port 12 to lead in the fuel, a nozzle 11 formed at the terminal of the leading-in port 12, a chamber 3 to hold the nozzle 11, and communicated with a suction port 18; a throttle part 4 formed at the nozzle lower side of the chamber 3, and a throat part 5 formed following to the throttle part 4, are provided. To the terminal of the throat part 5, a reflection surface 6 positioning at the end face in the axial direction, and an exhaust port 7 opened in the diameter direction, are provided. The liquid jetted from the nozzle 11 is reflected by the reflection surface 6 to form a liquid film of jet to shield an exhaust port 7, so as to prevent the air leakage from the throat part 5 to the suction port 18.
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