Rotary kinetic fluid motors or pumps – Smooth runner surface for working fluid frictional contact
Patent
1982-12-14
1988-05-24
Garrett, Robert E.
Rotary kinetic fluid motors or pumps
Smooth runner surface for working fluid frictional contact
F01D 136
Patent
active
047462655
ABSTRACT:
A high-vacuum molecular pump includes at least two coaxial elements (1 and 2) mounted rotatably with respect to each other and at a small distance from each other. A side of one of the elements (1) positioned opposite a side of another element (2) is provided with at least one helical groove (5), and a pump space (6) is present between these two sides of the elements, which pump space (6) is in communication with a gas supply (7) and a gas discharge (10,8). Near an end of a pair of elements (1 and 2) is a substantially annular gas supply chamber (9) which is bounded by these elements (1 and 2), the annular gas supply chamber (9) being in communication with the gas supply (7) and with the pump space (6) between the two elements (1 and 2), the helical groove (5) extending into the annular gas supply chamber (9). The elements (1 and 2) bounding the annular gas supply chamber (9) are so shaped that the annular gas supply chamber (9) is relatively wide near the gas supply (7), but narrows gradually downstream.
REFERENCES:
patent: 2730297 (1956-01-01), Van Dorsten et al.
patent: 3832084 (1974-08-01), Maurice
patent: 3967914 (1976-07-01), Gamell
patent: 4036565 (1977-07-01), Becker
patent: 4270882 (1981-06-01), Luijten et al.
A New Molecular Pump, by Louis Maurice, Japan. J. Appln. Phys. Suppl. 2, Pt. 1, 1974.
Garrett Robert E.
Pitko Joseph M.
Ultra-Centrifuge Nederland B.V.
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