System for controlling the stroke length of a double-diaphragm p

Details System for controlling the stroke length of a double-diaphragm p System for controlling the stroke length of a double-diaphragm p

1996-01-16

1998-10-06

Sheikh, Ayaz R.

Pumps

Condition responsive control of pump drive motor

By controlling drive motor motive fluid

417 53, 417 63, 417393, 417395, F04B 4900

Patent

active

058167781

ABSTRACT:
A control system for controlling the stroke length of an axially reciprocating shaft in a double-diaphragm pump between a leftmost shaft position and a rightmost shaft position. In one embodiment, the control system includes a marker on the shaft of the pump. A sensor is positioned adjacent to the shaft and located along the longitudinal axis of the shaft with respect to the marker to sense a change in the position of the marker when the shaft is at the leftmost and rightmost positions. The sensor sends signals to a controller that in turn sends a response signal to a driver. The drive alternates directing pressurized air to a first air cell and a second air cell to selectively reciprocate the shaft in a desired direction between the leftmost and rightmost shaft positions.

REFERENCES:
patent: 4381180 (1983-04-01), Sell
patent: 4436493 (1984-03-01), Credle, Jr.
patent: 4609817 (1986-09-01), Mumzhiu
patent: 4682937 (1987-07-01), Credle, Jr.
patent: 5052273 (1991-10-01), Sakaguchi
patent: 5238029 (1993-08-01), Akeel
patent: 5257914 (1993-11-01), Reynolds
patent: 5367944 (1994-11-01), Akeel et al.
patent: 5511458 (1996-04-01), Kamata et al.
Chempure.TM. Diaphragm Pump, manufactured by Furon Company, 1993.

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