Viscosimeter

Patent metadata

Field	Value
Publication number	US-10036695-B2
Application number	US-201514852799-A
Country	US
Kind code	B2
Filing date	Sep 14, 2015
Priority date	Sep 12, 2014
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

A viscometer has a hollow cylinder mounted in a base frame and rotated about its longitudinal axis. A measuring part being flowed through by a fluid to be tested is rotatably supported in the hollow cylinder. An electromagnetic drive with a stator and a rotor for the hollow cylinder is provided, with which the hollow cylinder is rotatable. The stator is supported on the base frame and the rotor is supported on the hollow cylinder. An electromagnetic coupling of the stator with the rotor is provided by a ring rotor disposed between the stator and the rotor. The ring rotor is mounted about the longitudinal axis of the hollow cylinder so that the base frame and the hollow cylinder are decoupled with respect to the electromagnetic drive and a torque by the electromagnetic drive is applied to the hollow cylinder while the acting forces on the hollow cylinder are minimized.

First claim

The invention claimed is:

1. A viscometer, comprising:
a base frame;
a hollow cylinder mounted in said base frame and rotating about a longitudinal axis;
a rotatably-mounted measuring part through which a fluid being tested flows and disposed within said hollow cylinder;
an electromagnetic drive having a stator and a rotor with which said hollow cylinder being rotatable in said base frame, said stator supported on said base frame and said rotor supported on said hollow cylinder; and
a ring rotor rotatably supported between said stator and said rotor, said ring rotor providing an electromagnetic coupling of said stator with said rotor, said ring rotor being driven by said stator about the longitudinal axis of said hollow cylinder, so that said base frame and said hollow cylinder are mechanically decoupled with respect to said electromagnetic drive, and a predetermined torque is transferable to said hollow cylinder via said electromagnetic drive, while forces acting axially and radially on said hollow cylinder are simultaneously minimized.

2. The viscometer according to claim 1 , further comprising fluid-tight sealing bearings, said hollow cylinder is rotatably mounted at opposite end areas with said fluid-tight sealing bearings in said base frame.

3. The viscometer according to claim 1 , wherein said hollow cylinder has a through-flow opening formed therein or a connecting pipe socket at each of its two ends.

4. The viscometer according to claim 1 , wherein:
said stator is selected from the group consisting of an electromagnetic coil, electromagnetic winding, and an electromagnet and is disposed on said base frame;
said ring rotor has a supporting ring; and
said ring rotor has permanent magnets, electromagnets or a plurality of windings, said permanent magnets, said electromagnets or said windings disposed side-by-side on said supporting ring of said ring rotor with alternating polarity.

5. The viscometer according to claim 4 , wherein:
said ring rotor is supported on said base frame or on an axis of rotation of said base frame; and
said permanent magnets, said electromagnets or said windings disposed on said ring rotor are disposed opposite said electromagnetic coil or said electromagnet of said stator when seen in an axial direction or radial direction of said hollow cylinder.

6. The viscometer according to claim 4 , wherein said hollow cylinder, in an area of its rotational axis or the longitudinal axis, has a through-flow opening formed therein or a connecting pipe socket at each of its two ends.

7. The viscometer according to claim 4 , wherein said stator surrounds said hollow cylinder.

8. The viscometer according to claim 4 ,
further comprising a carrier; and
wherein said rotor is an annular flange disposed at an end area of said hollow cylinder, directly extending away from or supported by said hollow cylinder in an end area of said hollow cylinder, by said carrier extending from said hollow cylinder and supporting said annular flange.

9. The viscometer according to claim 1 ,
further comprising a carrier; and
wherein said rotor is an annular flange directly extending away from or supported by said hollow cylinder and in an end area of said hollow cylinder, by said carrier extending from said hollow cylinder and supporting said annular flange.

10. The viscometer according to claim 9 , wherein said annular flange extends radially away from an outer wall of said hollow cylinder and extends around said hollow cylinder.

11. The viscometer according to claim 1 , further comprising a bearing supported on said base frame, said ring rotor is rotatable around said hollow cylinder on said bearing.

12. The viscometer according to claim 11 , wherein:
said base frame has a receiving internal space formed therein; and
said stator, said ring rotor, and said bearing carrying said hollow cylinder are covered or encapsulated fluid-tight against said receiving internal space of said base frame.

13. The viscometer according to claim 12 , further comprising a fluid-tight membrane for forming a fluid tight connection between said stator, said ring rotor, and said bearing carrying said hollow cylinder and said receiving internal space of said base frame.

14. The viscometer according to claim 11 , wherein said bearing surrounds said hollow cylinder.

15. The viscometer according to claim 1 , wherein said rotor is formed from a further hollow cylinder or a ring member connected with said hollow cylinder and surrounding said hollow cylinder, said ring rotor is disposed or rotates radially inside said stator and radially outside said rotor.

16. The viscometer according to claim 15 , wherein said annular flange or said ring member forming said rotor is made of an electrically-conductive material and can be driven by said ring rotor due to eddy currents induced in said annular flange by said ring rotor.

17. The viscometer according to claim 16 , wherein said electrically-conductive material is non-magnetic and non-magnetisable, and is a metal.

18. The viscometer according to claim 15 , wherein said hollow cylinder carried by said rotor is exclusively driven by eddy currents induced in said annular flange or said ring member of said rotor by said ring rotor.

19. The viscometer according to claim 1 , wherein said stator, said ring rotor and said rotor in a form of an annular flange on said base frame are disposed successively side-by-side in an axial direction or a radial direction of said hollow cylinder.

20. The viscometer according to claim 1 , wherein the longitudinal axis of said hollow cylinder and an axis of rotation of said ring rotor coincide with one another.

Assignees

• Anton Paar Gmbh

Inventors

• Belitsch Wolfgang
• Leopold Bernhard

Classifications

• G01N2011/145

  both members rotating · CPC title

• G01N11/14 Primary

  by using rotary bodies, e.g. vane (G01N11/16 takes precedence) · CPC title

• G01N2011/147

  Magnetic coupling · CPC title

• G01N2291/02818

  Density, viscosity · CPC title

• H02K49/10

  of the permanent-magnet type · CPC title