Rotary expansible chamber devices – Working chamber surface expressed mathematically
Patent
1984-08-31
1985-07-09
Smith, Leonard E.
Rotary expansible chamber devices
Working chamber surface expressed mathematically
418201, F01C 116, F01C 124
Patent
active
045279675
ABSTRACT:
Helical screw rotors for a screw rotor machine having improved asymmetric screw profiles on both male and female rotors, wherein the male rotor lobe leading flank comprises solely first and second circular arcs with the first circular arc subscribed by a first radius which lies on a radial line through the male rotor center at an offset angle to the male rotor lobe center line in the direction of the trailing flank of the rotor lobe to create a male rotor tip point inherently including a male rotor lobe sealing strip. Groove trailing flank portions of the female rotor lobes are defined by first and second circular arcs subscribed by first and second radii within addendum and dedendum portions of the female rotor lobes, providing a smooth uninterrupted surface starting below the pitch circle and terminating at or near the outside diameter of the female rotor lobes, with the point of tangency of the first and second radii of the female groove trailing flank portion occurring at a point of zero sliding with the male rotor on the pitch circle. The female rotor lobes have a main lobe peripheral surface defined by a true circular arc swung from an offset circle centered on the rotor axis at the groove trailing side, inherently producing a female rotor lobe sealing strip and significantly reducing the blow hole area of the screw rotor machine.
REFERENCES:
patent: 4053263 (1977-10-01), Ingalls
patent: 4088427 (1978-05-01), Emanuelsson
patent: 4140445 (1979-02-01), Schibbye
patent: 4210410 (1980-07-01), Ohtani
Dunham-Bush, Inc.
Obee Jane E.
Smith Leonard E.
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