Rotary fluid compressor having a spiral blade with an enlarging

Details Rotary fluid compressor having a spiral blade with an enlarging Rotary fluid compressor having a spiral blade with an enlarging

1990-01-24

1991-03-05

Vrablik, John J.

Rotary expansible chamber devices

Moving cylinder

Rotating

418183, 418220, F04C 1822

Patent

active

049973525

ABSTRACT:
A fluid compressor includes a rotating body arranged in a cylinder to extend in the axial direction of the cylinder and eccentric thereto. A spiral groove is formed on the outer circumference of the rotating body, and a spiral blade is slidably fitted in the groove. The pitches of the groove is narrowed at a predetermined rate with a distance from a suction-side end of the cylinder to a discharge-side end of the cylider. The groove has an enlarging section which has a start point, a changeover point, and a terminal point. The enlarging section includes a first portion extending from the start point to the changeover point and having a pitch which changes at a rate smaller than the predetermined rate, and a second portion extending from the changeover point to the terminal point and having a pitch which changes at a rate larger than the predetermined rate. The space between the rotating body and the cylinder is divided by the blade into a plurality of operation chambers.

REFERENCES:
patent: 1295068 (1919-02-01), Rolkerr
patent: 1572738 (1926-02-01), Maroger
patent: 2397139 (1946-03-01), Heaton
patent: 2401189 (1946-05-01), Quiroz
patent: 2527536 (1950-10-01), Engberg
patent: 3274944 (1966-09-01), Parsons
patent: 4871304 (1989-10-01), Iida et al.
patent: 4872820 (1989-10-01), Iida et al.
patent: 4875842 (1989-10-01), Iida et al.
European Search Report, EP 90101528.9, Aug. 16, 1990.

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