Roots type fluid machine

Details Roots type fluid machine Roots type fluid machine

2008-01-22

2008-01-22

Trieu, Theresa (Department: 3748)

Rotary expansible chamber devices

Working chamber surface expressed mathematically

C418S206100, C418S206500

Reexamination Certificate

active

07320579

ABSTRACT:
A roots type fluid machine includes a housing, a pair of parallel rotary shafts and two-lobe rotors. Each rotor includes two lobe portions and two well portions. Each lobe portion has a profile of convex arc with a radius R and each well portion has a profile of concave arc which is an envelope of the convex arc of the lobe portion. The rotor has a configuration defined by a curve which includes the convex arc, the concave arc and further an involute curve with a base radius r between the convex and concave arcs. The base radius r is set in a range L/(2√{square root over ( )}2)<r<0.3(√{square root over ( )}2)L where distance between axes of the rotary shafts is L, and the radius R is set in a range {(√{square root over ( )}2)/16}πL<R<{(27−5√{square root over ( )}2)/56}L.

REFERENCES:
patent: 1442018 (1923-01-01), Jansen
patent: 3089638 (1963-05-01), Rose
patent: 3275225 (1966-09-01), Schultz
patent: 4455132 (1984-06-01), Messori
patent: 4943214 (1990-07-01), Niimura et al.
patent: 01077782 (1989-03-01), None
patent: 9-246277 (1997-10-01), None

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