| abstract |
(57) [Problem] To provide a centrifugal liquid pump device having a viscosity calculating function capable of easily and reliably calculating a liquid viscosity without using a special viscometer. A centrifugal liquid pump device includes a centrifugal liquid pump device main body and a controller. The pump device main unit 5 includes a housing 20, a pump unit 2 having an impeller 21 rotating in the housing, an impeller rotation torque generating unit 3 including a motor 34 for rotating the impeller 21, and an impeller position control unit 4. The impeller rotates without contact with the housing. The controller 6 uses the impeller position control unit 4 to change the floating position of the impeller 21 in the housing 20, the current measurement function of the motor 34, and the floating position of the impeller 21. A liquid viscosity calculating function for calculating the viscosity of the liquid by using the obtained current change amount of the motor 34. |