Precisely flow-controlling pump

Details Precisely flow-controlling pump Precisely flow-controlling pump

1995-02-02

1997-09-09

Thorpe, Timothy

Pumps

Condition responsive control of pump drive motor

Single motor control element responsive to means sensing...

417 42, 417 442, 417 12, F04B 4900

Patent

active

056649371

ABSTRACT:
In a pump in which dual plunger is reciprocated with cams attached to the rotating shaft of a motor, the delivery pressure of liquid is measured during a certain period in each cycle of the pump. By setting the pressure during the certain period as a standard pressure value, the motor is controlled so that the delivery pressure during the remaining period in each cycle approaches to the standard pressure value. In this pump, rotating-speed-priority control and pressure-priority control are alternatingly performed to decrease pulsation during delivering liquid.

REFERENCES:
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patent: 4422942 (1983-12-01), Allington
patent: 4775481 (1988-10-01), Allington
patent: 4797207 (1989-01-01), Honganen et al.
patent: 4832575 (1989-05-01), Miller et al.
patent: 4883409 (1989-11-01), Strohmeier
patent: 4981597 (1991-01-01), Allington et al.
patent: 5089124 (1992-02-01), Mahar et al.
patent: 5174472 (1992-12-01), Raque et al.
patent: 5253981 (1993-10-01), Yang et al.

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