Screw vacuum pump with a reduced starting load

Details Screw vacuum pump with a reduced starting load Screw vacuum pump with a reduced starting load

1992-07-01

1994-05-24

Bertsch, Richard A.

Rotary expansible chamber devices

Interengaging rotating members

Helical or herringbone

418 9, F01C 116, F01C 124

Patent

active

053143205

ABSTRACT:
A screw vacuum pump is designed so that it is possible to reduce the load on the pump at the time of starting and evacuation of a gas under atmospheric pressure. The screw vacuum pump has male and female rotors rotating in mesh with each other around two parallel axes, respectively, and a casing for accommodating the rotors, the casing having a suction port and a discharge port, wherein the discharge port is formed so that V.sub.1 /V.sub.2 is in the range of 1.5 to 0.51, where V.sub.1 is a groove volume defined by the casing and the male and female rotors immediately after a gas has been trapped, and V.sub.2 is a groove volume immediately before the gas is discharged.

REFERENCES:
patent: 3151806 (1964-10-01), Whitfield
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 20, 1988, & JP-A-62 284 994, Dec. 10, 1987, Tsuru Seiji, et al., "Method for Starting Multistage Screw Vacuum Pump".
Patent Abstracts of Japan, vol. 14, No. 271, (M-983), Jun. 12, 1990, & JP-A-20 78 783, Mar. 19, 1990, Uchida Riichi, et al., "Screw Vacuum Pump".

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