Rotary kinetic fluid motors or pumps – With means for re-entry of working fluid to blade set – Turbine regenerative pump
Patent
1994-05-16
1995-10-10
Kwon, John T.
Rotary kinetic fluid motors or pumps
With means for re-entry of working fluid to blade set
Turbine regenerative pump
415 90, F04D 500
Patent
active
054565758
ABSTRACT:
The present invention refers to a pumping stage particularly designed for turbomolecular pumps, having increased compression ratio, and capable of extending the operating range of the turbomolecular pump towards high pressure. The new pumping stage comprises a casing housing, a rotor disk, and a substantially coplanar stator ring. The stator ring consists of two plates connected with each other along their circumferential periphery, thereby defining a region of close tolerance with the opposite surfaces of the rotor. The rotor and stator cooperate to define a tapered, free annular channel having a suction port and a discharge port at the opposite ends of this channel. The channel tapers in a functional, predetermined fashion, having the largest cross-sectional area near the suction port, and converging, according to the rotational direction of the rotor, at the discharge port.
REFERENCES:
patent: 3402669 (1968-09-01), Mamo
patent: 4573882 (1986-03-01), Watanabe et al.
patent: 4591311 (1986-05-01), Matsuda et al.
patent: 5238362 (1993-08-01), Casaro et al.
Helmer John C.
Levi Giampaolo
Fishman Bella
Kwon John T.
Power David J.
Varian Associates Inc.
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