Screw vacuum pump

Details Screw vacuum pump Screw vacuum pump

1992-09-08

1993-11-16

Bertsch, Richard A.

Rotary expansible chamber devices

Interengaging rotating members

Helical or herringbone

418 9, 417295, F01C 116

Patent

active

052618021

ABSTRACT:
A screw vacuum pump is capable of reducing the load thereon at the time of evacuation of a gas at atmospheric pressure by the use of a throttle plate. The screw vacuum pump has male and female rotors which rotate in meshing engagement with each other around two parallel axes, respectively, in a casing so that a gas that is sucked in from a suction opening is introduced through a suction port into a groove space defined between the male and female rotors and the casing is then discharged from a discharge opening through a discharge port, wherein the throttle plate is provided upstream of and near the opening of the suction port.

REFERENCES:
patent: 3977818 (1976-08-01), Sprankle
patent: 4968221 (1990-11-01), Noll
patent: 5051077 (1991-09-01), Yanagisawa et al.
Patent Abstracts of Japan, vol. 7, No. 291, (M-265)(1436), Dec. 27, 1983, JP-A-58162788, Sep. 27, 1983, T. Maruyama, "Compressor".
Patent Abstracts of Japan, vol. 7, No. 187, (M-236)(1332), Aug. 16, 1983, JP-A-5888487, May 26, 1983, I. Kawabe, et al., "Rotary Compressor".
Patent Abstracts of Japan, vol. 9, No. 34, (M-357)(1757), Feb. 14, 1985, JP-A-59176490, Oct. 5, 1984, S. Suzuki et al., "Screw Compressor".

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