Screw vacuum pump

Details Screw vacuum pump Screw vacuum pump

1992-07-01

1994-12-20

Bertsch, Richard A.

Rotary expansible chamber devices

Multistage

Interengaging rotary members

4182011, F04C 1816, F04C 2502

Patent

active

053741706

ABSTRACT:
To provide a screw vacuum pump which is compact and yet capable of attaining a high degree of vacuum. A screw vacuum pump having a pair of male and female rotors 7 and 7A rotating in mesh with each other around two parallel axes, respectively, and a casing 1 for accommodating the two rotors 7 and 7A, the casing 1 having a suction port 8b and a discharge port 9b, the screw vacuum pump further having a process of sucking a gas from the suction port 8b into a space defined between the rotors 7 and 7A, a process of transferring the gas, a process of compressing the gas, and a process of discharging the gas from the discharge port 9b, wherein the suction port 8b is closed early, thereby providing an expansion process between the suction and transfer processes.

REFERENCES:
patent: 3088659 (1963-05-01), Nilsson et al.
patent: 4068984 (1978-01-01), Spindler
patent: 4220197 (1980-09-01), Schaefer et al.
patent: 4667646 (1987-05-01), Shaw
patent: 5051077 (1991-09-01), Yanagisawa et al.
Patent Abstracts of Japan, vol. 12, No. 169 (M-699), May 1988, & JP-A-62 284 994, Dec. 10, 1987, Tsuru Seiji, et al., "Method for Starting Multistage Screw Vacuum Pump".

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