Patent ID: 8712003

Claim:
A jet pump comprising: a nozzle apparatus for ejecting a motive fluid; a throat for passing the motive fluid and a sucked suction fluid in a direction from an upper end portion to a lower end portion of the throat; and a diffuser into which the lower end portion of the throat is inserted; wherein the nozzle apparatus is disposed above a bell mouth installed on the upper end portion of the throat, apart from the bell mouth, the nozzle apparatus has a nozzle base member disposed above the bell mouth, and a plurality of nozzles installed to the nozzle base member, protruded from an undersurface of the nozzle base member toward the bell mouth and forming a plurality of narrowing portions, in which a fluid passage cross-sectional area of a motive fluid passage formed in the nozzle is reduced; and wherein a cross-sectional area of a fluid passage formed in the throat diminishes toward the lower end portion of the throat which is inserted into the diffuser.