Device and a method for measuring fluid-mechanically effective material parameters of a fluid

Patent metadata

Field	Value
Publication number	US-9297735-B2
Application number	US-201013512426-A
Country	US
Kind code	B2
Filing date	Nov 30, 2010
Priority date	Nov 30, 2009
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

A method and a device for the measurement of fluid-mechanically effective parameters of a fluid, with a fluid pump which comprises a delivery element ( 2 ) which is mounted in a magnet bearing ( 10, 10 a, 11, 11 a ), according to the invention, envisages the delivery element ( 2 ) of the fluid pump being excited into an oscillation by way of an excitation device ( 16, 44 ), wherein the oscillation parameters as well as, as the case may be, the oscillation behaviour is measured, and parameters of the fluid are determined from this.

First claim

The invention claimed is:

1. A device for the measurement of fluid-mechanically effective material parameters of a fluid, the device comprising:
an axial fluid pump which comprises a delivery element mounted in a magnet bearing, the magnet bearing comprising a permanent magnet and a first coil;
an excitation device for the oscillation excitation of the delivery element against a counter-force applied by the magnet bearing, the oscillation excitation in an axial direction in which the delivery element is configured to deliver the fluid, the excitation device comprising a second coil; and
a sensor device for measuring the oscillation behaviour of the delivery element.

2. A device according to claim 1 , wherein the sensor device comprises a first sensor for measuring an oscillation frequency of the delivery element.

3. A device according to claim 1 or 2 , wherein the sensor device comprises a second sensor for measuring the oscillation amplitude of the delivery element.

4. A device according to claim 1 or 2 , wherein the sensor device comprises a time detection device for measuring at least one of an oscillation build-up behaviour or an oscillation decay behaviour of the delivery element.

5. A device according to claim 1 or 2 , wherein the excitation device is connected to a device for the closed-loop control of a magnetic bearing force.

6. A device according to claim 2 , wherein the first sensor is connected to a position sensor of a magnet mounting of the delivery element.

7. A device according to claim 1 or 2 , wherein the delivery element is designed as a rotor.

8. A device according to claim 7 , wherein the magnet bearing is configured to support the delivery element in the axial direction.

9. A device according to claim 1 or 2 , wherein the magnet bearing is configured to support the delivery element in a radial direction perpendicular to the axial direction.

10. A method for measuring one or more fluid-mechanically effective material parameters of a fluid by way of a fluid pump which comprises a delivery element which is mounted in a magnet bearing, wherein the magnet bearing comprises a permanent magnet and a first coil, the method comprising:
exciting an oscillation of the delivery element , by way of an excitation device, against a counter-force applied by the magnet bearing, a closed-loop control of the magnet bearing having a time constant different than the oscillation of the delivery element excited by the excitation device, the excitation device comprising a second coil; and
measuring the oscillation behaviour of the delivery element.

11. A method according to claim 10 , wherein the frequency of the oscillation of the delivery element is measured after the end of the excitation.

12. A method according to claim 10 or 11 , wherein the amplitude of the oscillation is measured.

13. A method according to claim 10 , or 11 , wherein a decay time of the oscillation after the excitation is measured.

14. A method according to claim 10 , or 11 , wherein the energy expense for the oscillation excitation is measured.

15. A method according to claim 10 or 11 , wherein the measurement is carried out with an idle, non-rotating delivery element.

16. A method according to claim 10 or 11 , wherein the measurement is carried out during the fluid delivery.

17. A method according to claim 10 or 11 , wherein at least one of the rotational speed of the delivery element or a reaction force of the produced fluid pressure on a magnet bearing of the delivery element is measured, on operation of the fluid pump.

18. The method of claim 10 , wherein the exciting the oscillation of the delivery element comprises causing axial excitation of the delivery element by way of the excitation device, the method further comprising causing radial excitation of the delivery element by way of the second coil.

19. A device for the measurement of fluid-mechanically effective material parameters of a fluid, with a fluid pump which comprises a delivery element mounted in a magnet bearing, with an excitation device for the oscillation excitation of the delivery element against a counter-force applied by the magnet bearing, and with a sensor device for measuring the oscillation behaviour of the delivery element, wherein the magnet bearing comprises a permanent magnet and a first coil, the excitation device comprises a second coil, and the sensor device comprises at least one of a first sensor for measuring an oscillation frequency of the delivery element or a time detection device for measuring at least one of an oscillation build-up behaviour or an oscillation decay behaviour of the delivery element.

Assignees

• Graichen Kurt
• Arndt Andreas
• Nuesser Peter
• Berlin Heart Gmbh

Inventors

• Graichen Kurt
• Arndt Andreas
• Nuesser Peter

Classifications

• G01N11/162 Primary

  Oscillations being torsional, e.g. produced by rotating bodies · CPC title

• A61M1/1015

  Human Necessities · mapped topic

• G01N11/16 Primary

  by measuring damping effect upon oscillatory body · CPC title

• A61M60/822

  specially adapted for being actively controlled · CPC title

• A61M60/816

  Sensors arranged on or in the housing, e.g. ultrasonic flow sensors · CPC title