Patent ID: 6575705
Filing Date: 2003-06-10
Classification: F04F

Abstract:
A jet pump, comprising:a jet nozzle that discharges an operating fluid; a chamber that encloses a tip of the jet nozzle and has a constriction portion and an internal space into which a transfer fluid flows; a throat pipe connected to the chamber via the constriction portion of the chamber in a vicinity of the jet nozzle tip, the throat pipe discharging the transfer fluid that flows into the chamber, the throat pipe being formed to have a discharge-end with a smaller diameter than a diameter of a base-end thereof, with a ratio between a base-end inside diameter D1 and a discharge-end inside diameter D2 of the throat pipe being set at D1/D2=1.01 to 2 and the discharge-end of the throat pipe forming a smaller-diameter portion being bent at an angle of approximately 90 degrees from the base end, wherein the operating fluid, discharged from the jet nozzle, dwells in the throat pipe to submerge the tip of the jet nozzle so that a liquid seal is formed between the tip of the jet nozzle and any one of the constriction portion of the chamber and the base-end of the throat pipe.