Rotary expansible chamber devices – Interengaging rotating members – Helical or herringbone
Patent
1989-12-05
1991-09-24
Smith, Leonard E.
Rotary expansible chamber devices
Interengaging rotating members
Helical or herringbone
418197, F04C 1808, F04C 208
Patent
active
050510770
ABSTRACT:
The present invention is drawn to a screw compressor having a wide operating range with respect to flow rate and pressure ratio, wherein a discharge opening portion of a casing is provided with a generally tapered notch portion so that compressed gas is gradually discharged from a certain fixed point where a volume ratio of one groove defined by rotors and the casing is smaller than an inherent built-in volume ratio. Since the present invention is arranged in the above-mentioned manner, the flow of the gas at the discharge opening portion is reduced by the notch portion which is readily formed. Thereby the variation range of the pressure (the amplitude of pulsation of the pressure) is decreased and the noise level is lowered. Further, a loss of pressure resulting from the rapid flow of the gas is restricted to thereby widen a range of preferable performance of the compressor.
REFERENCES:
patent: 2480818 (1949-08-01), Whitefield
patent: 4018549 (1977-04-01), Segerstrom
patent: 4643655 (1987-02-01), Uthoff
"Development of the Eaton Supercharger", Loren H. Uthoff et al., SAE Technical Paper Series 870355, 1987.
"Noise Attenuation in Roots Blower", Ohtani et al., Japanese Machinery Association Papers, vol. 46, No. 407, Jul. 1980.
Maeda Mitsuru
Maruta Yoshiyuki
Sase Toshitsugu
Yanagisawa Kiyoshi
Cavanaugh David L.
Ebara Corporation
Smith Leonard E.
LandOfFree
Screw compressor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Screw compressor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Screw compressor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1694478