Tooth profile for compressor screw rotors

Details Tooth profile for compressor screw rotors Tooth profile for compressor screw rotors

1995-09-20

1997-04-29

Vrablik, John J.

Rotary expansible chamber devices

Working chamber surface expressed mathematically

4182013, F04C 1816

Patent

active

056242506

ABSTRACT:
An improved tooth profile for compressor screw rotors is disclosed. In the tooth profile, the following-side first curve of the male rotor is generated using a generation parameter of a quadratic function f(x)=a.sub.10 x.sup.2 +b.sub.10 x+c.sub.10 whose constants are optimized to meet specified constraint conditions. The above constraint conditions include an increased pressure angle for achieving good cutting condition of the rotors, a sealing surface suitable for minimizing the negative torque applied to a following rotor due to the gas pressure in the trapped pocket volume defined between the rotors, a large surface contact between the two rotors for improving the sealing effect as well as the durability of the rotors, and a minimized specific sliding at the driving force transmission part of the rotors for reducing the operational vibration and noise of the rotors.

REFERENCES:
patent: 4412796 (1983-11-01), Bowman
patent: 4435139 (1984-03-01), Astberg
patent: 4508496 (1985-04-01), Bowman
patent: 4576558 (1986-03-01), Tanaka et al.
patent: 4890991 (1990-01-01), Yoshimura

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