AIR OPERATED PUMP

摘要

An elongate air operated pump includes a pump chamber, a bladder inside the pump chamber, inlet and outlet valves to and from the chamber and an air control system. The air control system includes a control valve alternately communicating compressed air and exhaust to atmosphere to a venturi with a first end, a second end and a throat port. The first end of the venturi receives continuous compressed air. The second end receives the alternately communication of compressed air and exhaust to atmosphere from the control valve. The throat port of the venturi is in continuous communication with the bladder to pressurize and draw a vacuum on the bladder. The valves may be pneumatic pinch valves controlled by the control valve to cycle with the bladder or passive one-way pump valves.

主权项

1. An air operated pump comprising
a source of compressed air; an exhaust to atmosphere; a first pump chamber including a first inlet and a first outlet; a first valve controlling the first inlet of the first pump chamber; a second valve displaced toward the first outlet from the first valve; a first bladder in the first pump chamber between the first valve and the second valve; a first venturi including an inlet end, an outlet end and a venturi throat port, the source of compressed air being in communication with the inlet end of the first venturi, the venturi throat port of the first venturi being in communication with the first bladder; a control valve in communication with the source of compressed air, the exhaust to atmosphere and the outlet end of the first venturi, the control valve including a first position communicating the exhaust to atmosphere with the outlet end of the first venturi and a second position communicating the source of compressed air with the outlet end of the first venturi.