Rotary expansible chamber devices – Interengaging rotating members – Helical or herringbone
Patent
1990-02-23
1991-10-15
Vrablik, John J.
Rotary expansible chamber devices
Interengaging rotating members
Helical or herringbone
F04C 1816
Patent
active
050569953
ABSTRACT:
A displacement compressor has a housing defining a chamber and having an inlet and an outlet for the chamber. A pair of meshing helical rotors are rotatably supported about parallel axes in the chamber, so that a compressible fluid may be pumped from the inlet to the outlet. A recess in the wall of the housing is positioned in the chamber and around the outlet and has a substantially trapezoidal shape, in plan. The non-parallel edges of the substantially trapezoidal shape are angled with respect to the axial direction of the rotors, preferably by an angle which is substantially equal to the twist angle of the rotors. Noise producing pressure pulsations at the outlet are thereby reduced.
REFERENCES:
patent: 4193749 (1980-03-01), Yamazaki et al.
patent: 4781541 (1988-11-01), Sohler et al.
Takeda Toshio
Tamura Shigehiro
Yoshidomi Hideaki
Aisin Seiki Kabushiki Kaisha
Vrablik John J.
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