Rotary vane pump with ballast port

Details Rotary vane pump with ballast port Rotary vane pump with ballast port

1987-10-21

1989-05-02

Vrablik, John J.

Rotary expansible chamber devices

With plural working fluid inlet or outlet passages

F04C 18344, F04C 2904, F04C 2910

Patent

active

048264075

ABSTRACT:
Rotary vane pump with ballast ports which introduce air into the swept cells before they reach the pump outlet port. To prevent overheating at very high vacuums, the ballast ports are arranged to provide a ratio of ballast air flow to pump displacement, at a standard working vacuum of 20 inches Hg gauge, of at least 35%. This permits operating at 25 inches Hg gauge without the need for a cooling fan.

REFERENCES:
patent: 2639855 (1953-05-01), Daniels
patent: 2779533 (1957-01-01), Zlock
patent: 2885143 (1959-05-01), Dubrovin
patent: 3199771 (1965-08-01), Becker
patent: 4295804 (1981-10-01), Pezzot

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