Screw rotor for screw pump device having negative torque on the

Details Screw rotor for screw pump device having negative torque on the Screw rotor for screw pump device having negative torque on the

1990-01-08

1991-09-03

Vrablik, John J.

Rotary expansible chamber devices

Working chamber surface expressed mathematically

4182013, F04C 1816

Patent

active

050449060

ABSTRACT:
A screw rotor for a screw pump device includes a male rotor and a female rotor meashing with the male rotor and adapted to be driven by the male rotor, wherein a tooth profile of the female and male rotors is unsymmetrical such that the sum of absorbing torques of the female rotor is negative. Accordingly, a negative torque is always positively applied to the female rotor, thereby preventing the generation of abnormal noise and abnormal vibration due to collision of the tooth surfaces of both the rotors. As a result, a volumetric efficiency and an adiabatic efficiency can be improved.

REFERENCES:
patent: 3423017 (1969-01-01), Shibbye
patent: 4412796 (1983-11-01), Bowman
patent: 4460322 (1984-07-01), Shibbye et al.

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