Composite vacuum pump

Details Composite vacuum pump Composite vacuum pump

1989-04-27

1992-03-03

Fox, John C.

Pumps

Diverse pumps

Including rotary nonexpansible chamber type

4174234, F04B 3714

Patent

active

050927400

ABSTRACT:
A composite vacuum pump system having first and second vacuum pumps each having its own rotor and drive motor in which the exhaust of the first vacuum pump is removably coupled to the inlet of the second vacuum pump and the first vacuum pump rotor is driven at a constant torque and in which the second vacuum pump has an inlet for permitting the introduction into the pump of a heavy gas for increasing the efficiency of the pumping system.

REFERENCES:
patent: 3104802 (1963-09-01), Eckberg
patent: 3554263 (1971-01-01), Bachman
patent: 4797068 (1989-01-01), Hayakawa et al.

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