Two stage vacuum pump with shaft seal

Details Two stage vacuum pump with shaft seal Two stage vacuum pump with shaft seal

1984-02-08

1985-09-10

Vrablik, John J.

Rotary expansible chamber devices

Multistage

Sliding vane

418 96, 418104, 418142, 418DIG1, 277188A, F04C 200, F04C 1100, F04C 2702, F04C 2902

Patent

active

045403538

ABSTRACT:
The invention pertains to a two-stage vacuum pump for servicing refrigeration systems wherein a pair of electrically driven rotors support movable vanes engaging the cylindrical circumference of pumping chambers in which the rotors are mounted. The improvements pertain to the sealing of the rotor shaft, the introduction of metered oil into the pump, and the keying of a rotor to its driveshaft wherein improved assembly and operational characteristics are achieved.

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patent: 4283167 (1981-08-01), Bassan et al.
patent: 4295794 (1981-10-01), Cain

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