Two stage vacuum pump

Details Two stage vacuum pump Two stage vacuum pump

1984-07-16

1985-06-18

Husar, Cornelius J.

Pumps

Successive stages

418 13, 418238, 418269, F04B 2304, F04C 2502

Patent

active

045238979

ABSTRACT:
The invention pertains to a two stage vacuum pump particularly suitable for servicing refrigeration systems wherein a pair of electrically driven rotors support outwardly movable vanes engaging the cylindrical circumference of pumping chambers in which the rotors are mounted. The efficient relationship of components produces a high capacity pump in a concise configuration, lateral sides of the rotors are recessed to produce rapid seating of the vanes, reduce hydraulic end loading of the second stage rotor and minimize friction. The vanes are offset from the associated rotor axis to allow greater displacement for a given chamber bore and rotor size, and advantageous frictional forces are produced to augment sealing between the vane tips and chamber surface. Further, the vane tips are shaped to optimize compression and reduce gas re-expansion, and the rotors of the two stages are rotationally phased to improve capacity and pumping characteristics.

REFERENCES:
patent: 2588430 (1952-03-01), Svenson
patent: 4137018 (1979-01-01), Brucken
patent: 4283167 (1981-08-01), Bassan et al.

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