Membrane pump with tiltable rolling piston pressing the membrane

Details Membrane pump with tiltable rolling piston pressing the membrane Membrane pump with tiltable rolling piston pressing the membrane

1979-12-12

1982-06-01

Vrablik, John J.

Rotary expansible chamber devices

Collapsible progressively deformed working chamber wall

418153, F04C 500

Patent

active

043325343

ABSTRACT:
A membrane pump comprising a housing having an inner cylindrical surface, an annular member in the housing and having an outer surface defining with the inner surface of the housing a working space. A hollow rolling piston is arranged in the interior of said annular membrane. An eccentric drive including an arm fixed at one end to a drive shaft carries at its other end a roller engaging the inner surface of the rolling piston for rotating the latter about its axis while pressing the outer surface thereof against the inner surface of the membrane, whereby the outer surface of the membrane is pressed at a revolving sealing region against the inner surface of the housing. The membrane has a clamping portion projecting from the outer surface thereof and being sealingly secured in a corresponding cutout of the housing, so that the working space is divided between the clamping portion and the sealing region in a suction compartment and a pressure compartment with which inlet and outlet passages respectively communicate. The rolling piston is arranged tiltable with respect to the inner surface of the housing and the eccentric drive means so that the sealing region at which the membrane is pressed against the inner surface of the housing trails the point of contact of the roller with the inner surface of the rolling piston as considered in the direction of movement of the latter along the inner surface of the membrane.

REFERENCES:
patent: 664507 (1900-12-01), Singer
patent: 3408947 (1968-11-01), McMillan
patent: 3597123 (1971-08-01), Lutz
patent: 3644061 (1972-02-01), McFarlin

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