Scroll pump with axially spaced pumping chambers in series

Details Scroll pump with axially spaced pumping chambers in series Scroll pump with axially spaced pumping chambers in series

1985-11-18

1987-03-17

Vrablik, John J.

Rotary expansible chamber devices

Multistage

418 55, 418 60, F04C 1804, F04C 2300

Patent

active

046504052

ABSTRACT:
A multiple-turn scroll pump comprises a pumping unit on each lateral side of a base plate of an oscillatable scroll piston driven by an eccentric drive. Each pumping unit includes a spirally shaped groove in a scroll housing and a spirally shaped displacement blade forming part of the scroll piston. The groove in one of the pumping units extends from the peripheral part of the scroll housing through at least one turn of a spiral and terminates at the intermediate part of the housing. The groove in the other pumping unit also begins close to the peripheral part of the scroll housing but extends through a number of spiral turns greater than that of the groove in the first pumping unit. Passages are provided in the scroll piston to communicate grooves in both units in such a manner that the fluid drawn into the first pumping unit is compressed mainly in the second pumping unit and is discharged solely therefrom. Mechanism for constraining the movement of the oscillating piston with respect to the scroll housing is conveniently housed within the confinement of the groove in the first pumping unit to reduce the overall radial dimension of the pump.

REFERENCES:
patent: 3560119 (1971-02-01), Busch et al.
patent: 3802809 (1974-04-01), Vulliez
patent: 4466784 (1984-08-01), Hiraga

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