Apparatus for controlling the hydraulic circuit of a piston diap

Details Apparatus for controlling the hydraulic circuit of a piston diap Apparatus for controlling the hydraulic circuit of a piston diap

1989-02-08

1990-10-30

Smith, Leonard E.

Pumps

With signal, indicator, or inspection means

417386, 417395, 417478, F04B 2100, F04B 3502, F04B 4308

Patent

active

049665286

ABSTRACT:
An apparatus for controlling the hydraulic circuit of a piston diaphragm pump, having at least a pump diaphragm alternatingly subjected to the presure or the suction stroke of a piston operatingly connected to driving means, the apparatus comprising control means changing the amount of hydraulic medium displaced by the piston in dependence of a power demand or the like. A displacement sensor is associated with one side of the diaphragm facing the hydraulic medium, the sensor measuring the stroke travel of the diaphragm and generating a corresponding stroke travel signal which is transmitted to control means, the control means including storage means storing predetermined stroke values and/or stroke value ranges for predetermined hydraulic power values of the pump. The control means compare the stroke travel signal with the predetermined stroke values or stroke value ranges and generate a control signal if the measured stroke travel deviates from the predetermined value or value range to change the amount of hydraulic medium per time unit and/or to generate an alarm signal in dependence of the control signal.

REFERENCES:
patent: 4212589 (1980-07-01), Bosio
patent: 4492535 (1985-01-01), Stahlkopf
patent: 4565340 (1986-01-01), Stahlkopf
patent: 4758228 (1988-07-01), Williams
patent: 4828464 (1989-05-01), Maier et al.

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