Variable capacity roller- and vane-type pumps with non-circular

Details Variable capacity roller- and vane-type pumps with non-circular Variable capacity roller- and vane-type pumps with non-circular

1985-07-05

1987-06-16

Vrablik, John J.

Rotary expansible chamber devices

With changeable working chamber magnitude

Spring or fluid biased movable member

418 27, 418150, 418225, 418 30, F04C 2344, F04C 1504

Patent

active

046733418

ABSTRACT:
A roller or vane type pump is described of the kind in which the cam ring is pivotally mounted within an external casing to vary the throw of the cam ring and hence the pump delivery means is provided whereby a constant flow is obtained regardless of the pump speed. The cam surface of the cam ring is not wholly circular. The two portions of the cam surface extending between the inlet and outlet ports of the pump at opposite sides respectively of the pump axis have curvatures such that the instantaneous distance R.sub.2 of the point of contact of one of the sealing rollers or vanes with the cam surface from the axis of rotation of the rotor is given by R.sub.2 =.sqroot.R.sub.1.sup.2 +k where k is a constant and R.sub.1 is a corresponding instantaneous distance of the point of contact of the other sealing roller or vane with the cam surface from said axis.

REFERENCES:
patent: 2225803 (1940-12-01), Smith
patent: 3711227 (1973-01-01), Schmitz

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