Screw rotor lobe profile for simplified screw rotor machine capa

Details Screw rotor lobe profile for simplified screw rotor machine capa Screw rotor lobe profile for simplified screw rotor machine capa

1989-05-19

1990-07-03

Koczo, Michael

Rotary expansible chamber devices

Interengaging rotating members

Helical or herringbone

F04C 216

Patent

active

049386727

ABSTRACT:
Helical screw rotors for a screw rotor machine wherein, for both the male and female rotor, the rotor profile includes involute curves for the male and female rotor lobe tip portion and rotor root portion, thereby generating mating involute curved surfaces of the corresponding groove, root and tip portion for the female rotor, resulting in low leakage path between the high and low pressure volumes when the rotors are in mesh, and causing ramps on the lobe tips of both the male and female rotors to form high points thereof which act as sealing strips during intermesh rotation of the rotors and in conjunction with the screw rotor machine casing. The screw rotor machines are provided with capacity control variance for same drive rotor rpm by maintaining one rotor outside diameter, root diameter, and length to diameter ratio and basic lobe proportions the same, and with the same number of lobes while for the other rotor, the outside diameter, the root and pitch diameters, and the number of lobes are varied, while maintaining basic lobe proportions the same, with significant change in machine expansion or compression capacity for a compressible working fluid captured between the intermeshed helical screw rotors.

REFERENCES:
patent: 4028026 (1977-06-01), Menssen
patent: 4053263 (1977-10-01), Ingalls
patent: 4445831 (1984-05-01), Ingalls
patent: 4508496 (1985-04-01), Bowman
patent: 4527967 (1985-07-01), Ingalls
patent: 4643654 (1987-02-01), Rinder

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