Pumps – Condition responsive control of pump drive motor – Single motor control element responsive to means sensing...
Patent
1990-08-20
1992-04-28
Smith, Leonard E.
Pumps
Condition responsive control of pump drive motor
Single motor control element responsive to means sensing...
417 22, 417 32, F04B 126, F04B 4900
Patent
active
051082640
ABSTRACT:
The invention is a method and apparatus for significantly improving the performance of a reciprocating pump by delivering the pumping fluid at a desired pressure and flow rate with minimal flow fluctuations. The compressibility of the pumping fluid directly effects volumetric flow rate and mass flow rate. The method includes the step of sensing various pump parameters related to said compressibility and adjusting the pumping speed to make appropriate accommodations. In particular, the compressibility of the pumping fluid is effected by the adiabatic heating of the pumping fluid during compression, variations in pumping fluid density, leaks in the check valves of cylinder/piston seals and the primary and secondary switching losses in the fluid flow occurring when the primary and secondary pistons reverse direction.
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patent: 4681513 (1987-07-01), Saito
patent: 4797207 (1989-01-01), Honganen et al.
patent: 4808077 (1989-02-01), Kan et al.
patent: 4883409 (1989-11-01), Stohmeier et al.
Hewlett--Packard Company
Schuette Richard F.
Smith Leonard E.
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