Rotary kinetic fluid motors or pumps – Smooth runner surface for working fluid frictional contact
Patent
1998-09-11
2000-08-29
Verdier, Christopher
Rotary kinetic fluid motors or pumps
Smooth runner surface for working fluid frictional contact
4151995, 4152082, 4152091, 4152112, F04D 1904, F01D 136
Patent
active
061098647
ABSTRACT:
A turbo-molecular vacuum pump comprising alternate first and second stages. The first stage comprises a plurality of blades arranged in an annular envelope with the blades depending radially from a disc and being angled about radial lines out of the plane of the disc. The second stage comprises a plurality of coaxial, concentric frusto-conical members arrayed in a plane parallel to that of the annular envelope such that at least some of the blades and at least some of the frusto-conical members are axially aligned and are adapted to remain so during rotation of one stage relative to the other.
REFERENCES:
patent: 940103 (1909-11-01), Feld
patent: 4655680 (1987-04-01), Klepesch
Schofield Nigel Paul
Stones Ian
Pace Salvatore P.
The BOC Group plc
Verdier Christopher
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