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AssigneeHitachi Plant Technologies, Ltd.
InventorsMasaaki Iwasa, Takeshi Tsukamoto, Hideto Nogiwa, Tetsuya Kuwano, Yoshihisa Maeda, Hiromi Kobayashi, Ryujiro Udo
Estimating the term…
Blades are connected to the surface of a disk and slots are formed in the surface of a shroud, which is opposite from the other surface of the shroud where the blades are to be welded. The blades are arranged on the opposite surface from the slots and a laser beam is applied from the surface in which the slots are formed, to weld the shroud and the blades. Components are installed on the surfaces of the slots on the opposite side from the blades after the blades and the shroud in which the slots are formed are welded. Alternatively, the slots are filled with a material different from that of the shroud, such as a resin. With this configuration, distortion caused by welding heat can be reduced without degrading the fluid performance.
A welding slot sealing structure for an impeller having a round disk, a plurality of blades attached radially at a predetermined angle to a surface of the disk, and a shroud attached to outer edges of the blades, in which slots are formed in a surface of the shroud, the blades are brought into contact with an opposite surface of the shroud from the slots and the shroud and the blades are welded by applying a laser beam from surfaces of the slots, wherein after the blades have been laser-welded to the shroud, components different from the shroud are installed on the surfaces of the slots on the opposite side from the blades so that the slots are flush with the shroud,
A welding slot sealing structure for an impeller comprising:
Dependencies are inferred from the claim text.