Conjugate screw rotor profile

Details Conjugate screw rotor profile Conjugate screw rotor profile

1998-05-29

2000-10-31

Nguyen, Hoang

Rotary expansible chamber devices

Interengaging rotating members

Helical or herringbone

418150, F01C 116

Patent

active

061392995

ABSTRACT:
The point of tangency of the tip circle of the male rotor and the root circle of the female rotor is used as a starting point in generating the series of curves defining the male and female conjugate rotor profiles. The present invention provides: reduced viscous drag through the use of a departure angle; strengthened female lobes by controlling thickness along the pitch circle; opened root of male rotor to enhance manufacturability and tool life; a tortuous leakage path for gas traveling from a high pressure thread to a low pressure thread; better control of root diameter; and control of the pressure angle independently of the other variables.

REFERENCES:
patent: Re32568 (1987-12-01), Astberg
patent: 3314598 (1967-04-01), Lysholm
patent: 3932073 (1976-01-01), Schibbye et al.
patent: 5207568 (1993-05-01), Szymaszek

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