Rotary kinetic fluid motors or pumps – Smooth runner surface for working fluid frictional contact
Patent
1987-08-26
1989-12-12
Garrett, Robert E.
Rotary kinetic fluid motors or pumps
Smooth runner surface for working fluid frictional contact
415143, F01D 136
Patent
active
RE0331295
ABSTRACT:
A vacuum pump including a centrifugal compressor stage on the side of a suction opening and a circumferential flow compressor on the side of an exhaust opening. The centrifugal compressor pump works as a Siegbahn pump at a steady state, and works as a centrifugal compressor under a transient condition at the initial stage of the pump operation, thus obtaining a high pumping speed under the transient condition.
REFERENCES:
patent: 3045428 (1962-07-01), McLean
patent: 3969039 (1976-07-01), Shoulders
patent: 4579508 (1986-04-01), Tsumaki et al.
patent: 4668160 (1987-05-01), Mase et al.
patent: 4732529 (1988-03-01), Narita et al.
"Fans" by Bruno Eck, Oct. 1949, p. 463.
Mase Mashiro
Nagaoka Takashi
Taniyama Minoru
Terajima Makoto
Tsutsumi Yoshitsugu
Garrett Robert E.
Hitachi , Ltd.
Kwon John T.
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