Hydropneumatic constant pressure device
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United States of America Patent
Stats
-
Mar 2, 1993
Grant Date -
N/A
app pub date -
May 30, 1991
filing date -
Jun 1, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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