Pumps – Condition responsive control of pump drive motor – Responsive to accumulation of pumped liquid in receiver
Patent
1991-05-30
1993-03-02
Bertsch, Richard A.
Pumps
Condition responsive control of pump drive motor
Responsive to accumulation of pumped liquid in receiver
417 43, 417543, F04B 4902, F04B 4906, F04B 4908
Patent
active
051904438
ABSTRACT:
A hydropneumatic arrangement is provided for actuating a pump upon pressure decrease and for deactivating the pump upon flow decrease. The hydropneumatic arrangement includes a bearing cylinder; a flow sensor piston movably disposed within the bearing cylinder; a driving piston connected to the flow piston by a common shaft, the flow sensor piston being moved according to a variation in consumption demand by an interaction of a force of flow exerted against the flow sensor piston and a force of pressure exerted on the driving piston. A pressure switch is provided and is electrically connected to an electric motor that drives the pump. The drive cylinder communicates with the pressure switch, the drive cylinder being opened to system pressure in the driving piston, communicated toward the system pressure due to a sealing arrangement that permits a flow outwardly of, but not inwardly into, the drive cylinder and communicated from the system pressure only when the flow sensor piston is at a point of maximum displacement. A hydropneumatic tank is provided having an air injection pump. The arrangement also includes an actuating piston for driving the injector pump piston.
REFERENCES:
patent: 3782858 (1974-01-01), Deters
patent: 4329120 (1982-05-01), Walters
Bertsch Richard A.
Scheuermann David W.
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