Roots blower with improved clearance between rotors

Details Roots blower with improved clearance between rotors Roots blower with improved clearance between rotors

1990-02-07

1991-08-20

Vrablik, John J.

Rotary expansible chamber devices

Working chamber surface expressed mathematically

418206, F04C 1818

Patent

active

050409590

ABSTRACT:
A Roots blower has two rotors in which each of said rotors, as viewed in plan view thereof in the direction of the rotational axis thereof. The rotor has a center and orthogonal short and long axes and has a final shape of a contour offset from a basic profile curve by an offset distance at every point thereof in the normal line direction thereto. The offset distance is also determined in accordance with a function which assumes a maximum value when the angle between a line connecting the rotor center with the point and either of the short and long axes is 45 degrees, which assumes a minimum value when the line coincides with either of the short and long axes, and the function comprises an exponential power of a sine function.

REFERENCES:
patent: 3275225 (1966-09-01), Schultz
patent: 4666384 (1987-05-01), Kaga et al.

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