Positive displacement machine having improved displacement curve

Details Positive displacement machine having improved displacement curve Positive displacement machine having improved displacement curve

1984-05-29

1985-12-03

Freeh, William L.

Rotary expansible chamber devices

Methods

418150, F04C 1800

Patent

active

045563721

ABSTRACT:
The invention relates to a positive displacement machine, such as a rotary pump, engine or compressor. This machine has a slotted rotor, sealing elements sliding in the slots and a tubular stator formed with a cylindrical inner surface, the contour line of which is particular. This contour line has a symmetry order s.sub.S and is composed of s.sub.S lobes belonging to a shortened hypertrochoid with a core, the symmetry order of this hypertrochoid being s.sub.H .noteq.s.sub.S, and s.sub.S sealing zones belonging to the contour line of the core of the hypertrochoid. Each lobe has a center point angle .theta..sub.H, each sealing zone a center point angle .theta..sub.c, .theta..sub.H and S.sub.H being related to .theta..sub.c and s.sub.S by the expressions:

REFERENCES:
patent: 2791185 (1957-05-01), Bohnhoff et al.
patent: 3247803 (1966-04-01), Halsey
patent: 4432711 (1984-02-01), Tsuchiya et al.
patent: 4507068 (1985-03-01), Hayase et al.

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