Rotary kinetic fluid motors or pumps – Centrifugal bowl pump
Patent
1990-07-10
1992-05-26
Look, Edward K.
Rotary kinetic fluid motors or pumps
Centrifugal bowl pump
73 407, F04D 1904
Patent
active
051161966
ABSTRACT:
A mechanical pump assembly (20) for pumping a secondary vacuum, the assembly comprising two pumping stages, the first stage having a suction inlet (9) and the second stage having a suction orifice (10), said inlet and said orifice both opening out to the outside, both stages having a common delivery outlet (4), the pump assembly being characterized in that both of said pumping stages are of the Holweck drum type, said first stage having a compression ratio of about 50 for a gas such as helium and of about 30,000 for air, the pumping speed of the first stage being about 4 l/s for air and about 2.5 l/s for said gas, and in that said second stage has a pumping speed of about 3.5 l/s for air and of about 2 l/s for said gas, the nominal speed of rotation of said mechanical pump assembly being about 27,000 rpm.
REFERENCES:
patent: 2730297 (1956-01-01), Van Dorsen et al.
patent: 4365158 (1982-12-01), Tallon
patent: 4806074 (1989-02-01), Burger et al.
patent: 4893985 (1990-01-01), Holss
patent: 4904155 (1990-02-01), Nagaoka et al.
patent: 4919599 (1990-04-01), Reich et al.
patent: 4984450 (1991-01-01), Burger
Baret Gilles
Perrillat-Amede Denis
Alcatel Cit
Lee Michael S.
Look Edward K.
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