Centrifugal fluid pump assembly

Details Centrifugal fluid pump assembly Centrifugal fluid pump assembly

1998-09-08

2000-11-07

Freay, Charles G.

Pumps

Motor driven

Electric or magnetic motor

417 442, 417 63, 623 3, F04B 1700

Patent

active

061427527

ABSTRACT:
A centrifugal fluid pump assembly has a pump body and a controller. The pump body has a housing, a pump section having an impeller rotating inside the housing, an impeller rotational torque generating section having a motor for rotating the impeller and an impeller position control section. The impeller rotates without contacting the housing. The controller has an impeller-floating position control function for changing the floating position of the impeller inside the housing by using the impeller position control section, a function of measuring electric current for driving the motor and a fluid viscosity calculation function for calculating a viscosity of fluid by utilizing a variation amount of the motor-driving electric current obtained by changing the floating position of the impeller.

REFERENCES:
patent: 4964847 (1990-10-01), Prince
patent: 5725357 (1998-03-01), Nakazeki
patent: 5798454 (1998-08-01), Nakazeki

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