Fluid reaction surfaces (i.e. – impellers) – Rotor having flow confining or deflecting web – shroud or... – Apertured or foraminous web or shroud
Patent
1990-01-18
1991-01-22
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
Rotor having flow confining or deflecting web, shroud or...
Apertured or foraminous web or shroud
416182, 416213R, 403259, 403383, F04D 2938, F01D 530
Patent
active
049867369
ABSTRACT:
A pump impeller manufactured by press forming of steel plate and comprising a boss formed with a central bore for connecting the boss to a main shaft of the pump through key and key way engagement, and a main shroud fixed to the boss is disclosed. The impeller is characterized in that the boss is formed with a polygonal portion on the periphery of the boss and the main shroud is formed at central portion thereof with a polygonal recess fitting to the polygonal portion of the boss. A retainer plate is mounted on the boss at an end portion thereof opposite to an end portion from which the main shroud is fitted to the boss and is connected by welding to the main shroud. Thereby, since the power is transmitted from the boss to the main shroud through polygonal surfaces, no substantial stress concentration occurs at the power transmitting area.
REFERENCES:
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patent: 4080079 (1978-03-01), Waara
patent: 4285305 (1981-08-01), Kaufman et al.
patent: 4337747 (1982-07-01), Jefferson et al.
patent: 4693136 (1987-09-01), Clerc et al.
patent: 4720242 (1988-01-01), Lovisetto
patent: 4890980 (1990-01-01), Heald et al.
patent: 4925369 (1990-05-01), Steiner et al.
Patent Abstracts of Japan, vol. 7, #179 (M-234) (1324), Aug. 9, 1983.
Ikeda Hideo
Kajiwara Ken-ichi
Mori Kikuichi
Ebara Corporation
Look Edward K.
Nguyen Hoang
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