Patent Number: 
Section: claims

1. A jet pump comprising:a nozzle apparatus extending in an axial direction including a header portion, a first pipe member extending in the axial direction of the nozzle apparatus so that the first pipe member extends in the axial direction and forming a first suction liquid passage for introducing suction liquid, the header portion surrounding the first pipe member for introducing a driving liquid, and a nozzle portion connected to the header portion, the nozzle portion surrounding the first pipe member and forming an annular ejection outlet for ejecting the driving liquid from the header portion;a jet pump body having a bell mouth disposed below the nozzle apparatus;a second suction liquid passage formed between the nozzle apparatus and the bell mouth for introducing suction liquidthe jet pump body enabling mixing of the driving liquid and the suction liquid sucked through the first and second suction liquid passages by the ejection of the driving liquid from the header portion and enabling discharging the mixed liquid from the jet pump body; anda second pipe member having one end connected to the nozzle apparatus for introducing the driving liquid to the header portion;wherein the first pipe member is disposed through the one end of the second pipe member and inside a driving liquid passage formed in the second pipe member and forms an opening portion of the first suction liquid passage opened to an outside of the second pipe member in the axial direction of the first pipe member, and an outlet of the first suction liquid passage formed by the first pipe member being in communication with the opening portion of the first pipe member in the axial direction of the first pipe member; andwherein the driving liquid passage is formed so that the driving liquid flowing toward the one end of the second pipe member hits the first pipe member diagonally to the axial direction of the first pipe member in a straight pipe portion of the first pipe member. 2. The jet pump according to claim 1, wherein the first pipe member forms a curved surface curving toward the axial direction of the first pipe member, on an inside surface of the opening portion. 3. The jet pump according to claim 1, wherein the end portion of the first pipe member where the opening portion is formed protrudes outside of the second pipe member; and in the protruding portion of the first pipe member, the diameter of an end of the suction liquid passage where the suction liquid is sucked is larger than the diameter of the suction liquid passage at the part where the first pipe member passes through the second pipe member. 4. The jet pump according to claim 1, wherein the second pipe member is curved in an inverted U-shape. 5. The jet pump according to claim 1, wherein a flow-adjusting member is disposed in the second pipe member along a center axis of the second pipe member. 6. The jet pump according to claim 5, wherein the flow-adjusting member is disposed to an upper course of the first pipe member. 7. The jet pump according to claim 1, wherein the first pipe member extends in an axial direction of the nozzle apparatus. 8. A jet pump comprising:a nozzle apparatus extending in an axial direction including a header portion, a first pipe member extending in the axial direction so that the first pipe member extends in the axial direction and forming a first suction liquid passage for introducing suction liquid, the header portion surrounding the first pipe member for introducing a driving liquid, and a nozzle portion connected to the header portion, the nozzle portion surrounding the first pipe member and forming an annular ejection outlet for ejecting the driving liquid from the header portion;a jet pump body having a bell mouth disposed below the nozzle apparatus;a second suction liquid passage formed between the nozzle apparatus and the bell mouth for introducing suction liquid;the jet pump body enabling mixing of the driving liquid and the suction liquid sucked through the first and second suction liquid passages by the ejection of the driving liquid from the header portion and enabling discharging the mixed liquid from the jet pump body; andan inverted U-shaped second pipe member having one end connected to the nozzle apparatus for introducing the driving liquid to the header portion;wherein the first pipe member extending in the axial direction extends in an axial direction of the nozzle apparatus and is disposed through the one end of the second pipe member inside a driving liquid passage formed in the second pipe member and forms an opening portion of the first suction liquid passage opened to an outside of the second pipe member in the axial direction of the first pipe member, and an outlet of the first suction liquid passage formed by the first pipe member being in communication with the opening portion of the first pipe member in the axial direction of the first pipe member;wherein the driving liquid passage formed in the inverted U-shaped section second pipe member is formed so that the driving liquid flowing toward the one end of the second pipe member hits the first pipe member diagonally to the axial direction of the first pipe member in a straight pipe portion of the first pipe member; anda fixing position of the first pipe member to the second pipe member in the axial direction of the first pipe member is disposed lower than a top point of an outer surface of the inverted U-shape second pipe member. 9. The jet pump according to claim 8, wherein a flow-adjusting member is disposed in the second pipe member along a center axis of the second pipe member. 10. A nuclear reactor comprising:a reactor vessel, a plurality of jet pumps disposed in the reactor vessel for supplying coolant to a core formed in the reactor vessel, and a raiser pipe disposed in the reactor vessel for introducing driving liquid;wherein the jet pump comprises:a nozzle apparatus extending in an axial direction including a header portion, a first pipe member extending in the axial direction of the nozzle apparatus so that the first pipe member extends in the axial direction and forming a first suction liquid passage for introducing suction liquid, the header portion surrounding the first pipe member for introducing driving liquid, and a nozzle portion connected to the header portion, the nozzle portion surrounding the first pipe member and forming an annular ejection outlet for ejecting the driving liquid from the header portion;a jet pump body having a bell mouth disposed below the nozzle apparatus;a second suction liquid passage formed between the nozzle apparatus and the bell mouth for introducing suction liquid;the jet pump body enabling mixing of the driving liquid and the suction liquid sucked through the first and second suction liquid passages by the ejection of the driving liquid from the header portion and enabling discharging the mixed liquid from the jet pump body; anda second pipe member having one end connected to the nozzle apparatus for introducing the driving liquid to the header portion;wherein the first pipe member is disposed through the one end of the second pipe member and inside a driving liquid passage formed in the second pipe member and forms an opening portion of the first suction liquid passage opened to an outside of the second pipe member in the axial direction of the first pipe member, and an outlet of the first suction liquid passage formed by the first pipe member being in communication with the opening portion of the first pipe member in the axial direction of the first pipe member;wherein the driving liquid passage is formed so that the driving liquid flowing toward the one end of the second pipe member hits the first pipe member diagonally to the axial direction of the first pipe member in a straight pipe portion of the first pipe member; andwherein the second pipe member is connected to an upper end portion of the raiser pipe. 11. The nuclear reactor according to claim 10, wherein the plurality of jet pumps include two jet pumps, the second pipe member of each of the two jet pumps is connected to the raiser pipe which is disposed adjacent to the two jet pumps, the raiser pipe being a single raiser pipe. 12. The jet pump according to claim 1, wherein the jet pump body further includes a throat and a diffuser extending in the axial direction of the nozzle apparatus. 13. The jet pump according to claim 8, wherein the jet pump body further includes a throat and a diffuser extending in the axial direction of the nozzle apparatus. 14. The nuclear reactor according to claim 10, wherein the jet pump body further includes a throat and a diffuser extending in the axial direction of the nozzle apparatus.