Pumps – Motor driven – Fluid motor
Patent
1974-09-23
1976-05-11
Croyle, Carlton R.
Pumps
Motor driven
Fluid motor
1375253, F04B 4306, F04B 4500, F16K 1500
Patent
active
039559017
ABSTRACT:
An air pressure-operated membrane pump for pumping a liquid comprises a housing including a chamber which is divided into liquid and air compartments by a floppy flexible membrane extending across it. The air compartment has an air inlet and outlet connected by a duct to the throat of a venturi to which an air supply under pressure is connected. The outlet from the venturi is controlled by a control valve which is itself opened and closed by the movement of the diaphragm to which a closure member of the valve is connected by a control member. When the valve is open, air flows through the venturi and causes air to be drawn from the air compartment of the pump to move the diaphragm in a direction to draw liquid into the liquid compartment in an intake stroke. At the end of this stroke, the part of the membrane to which the control member is fixed moves and closes the control valve. This causes air under pressure to flow from the throat of the venturi into the air compartment to move the diaphragm in a direction to expel liquid from the liquid compartment in a pumping stroke and again at the end of this stroke movement of the diaphragm moves the control member to shut the valve so that the cycle of operations is repeated, the control of operation of the pump thus being effected entirely by the movement of the membrane itself without any external agency.
REFERENCES:
patent: 3320970 (1967-05-01), McHenry
patent: 3514227 (1970-05-01), Rupp
patent: 3666379 (1972-05-01), Mitchell
patent: 3781141 (1973-12-01), Schall
Croyle Carlton R.
Gluck Richard E.
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