Patent ID: 8467492

Claim:
A nozzle apparatus of a jet pump comprising: a first tubular member; a second tubular member disposed in the first tubular member, apart from the first tubular member; a fluid passage forming member disposed in the first tubular member, and installed to an upper end portion of the second tubular member; a plurality of passage members having one end portion fixed to the first tubular member and having another end portion fixed to the second tubular member, and disposed in the circumferential direction of the nozzle apparatus; and an annular ejection outlet is formed between a lower portion of the first tubular member and a lower portion of the second tubular member; wherein a suction passage formed in each of the passage member, for introducing the suction fluid from outside of the nozzle apparatus to inside of the nozzle apparatus, communicates with an inner region formed in the second tubular member; wherein an opening of the suction passage is formed at the one end portion of each passage member which is fixed to the first tubular member and the opening is opened to an outside region of the nozzle apparatus; wherein an annular driving fluid passage for introducing the driving fluid, across which each of the passage members is disposed, is formed between the first tubular member, the second tubular member and the fluid passage forming member, and communicated with an annular ejection outlet; and wherein an ejection outlet-side portion of the driving fluid passage slopes inward toward the lower end of the nozzle apparatus.