Coriolis mass flowmeter and node element

Patent metadata

Field	Value
Publication number	US-11454528-B2
Application number	US-202017089787-A
Country	US
Kind code	B2
Filing date	Nov 5, 2020
Priority date	Nov 5, 2019
Publication date	Sep 27, 2022
Grant date	Sep 27, 2022

Abstract

A Coriolis mass flowmeter having at least one measuring tube with at least one oscillation generator and at least two oscillation sensors and having at least two node elements. The at least one oscillation generator excites the measuring tube to oscillation during operation. The at least two node elements define the oscillation range. At least one node element has at least one stiffening element. An effective separation of undesired interference oscillations of the measuring tube is achieved by the at least one stiffening element increasing the stiffness of the measuring tube with respect to oscillations orthogonal to the excitation mode and to the Coriolis mode so that, during operation, the oscillation frequency of the oscillation orthogonal to the excitation mode and to the Coriolis mode is greater than the oscillation frequency of the excitation mode, preferably greater than that of the Coriolis mode.

First claim

What is claimed is:

1. A Coriolis mass flowmeter, comprising:
at least one measuring tube,
at least one oscillation generator, and
at least two oscillation sensors and having at least two node elements, wherein the at least one oscillation generator is adapted to excite the measuring tube to oscillation during operation,
wherein the at least two node elements define an oscillation range, and
wherein at least one of the at least two node elements has at least a first stiffening element,
wherein the at least one node element which has the first stiffening element is configured and arranged in such a manner that the stiffening element increases the stiffness of the measuring tube with respect to oscillations orthogonal to an excitation mode and to a Coriolis mode so that, during operation, the oscillation frequency of oscillation orthogonal to the excitation mode and to the Coriolis mode is greater than an oscillation frequency of the excitation mode, and
wherein the first stiffening element has at least two separately acting components or at least two separate components.

2. The Coriolis mass flowmeter according to claim 1 , further comprising at least a second stiffening element, wherein the second stiffening element is arranged opposite to the first stiffening element on the node element.

3. The Coriolis mass flowmeter according to claim 1 , wherein the first stiffening element has a resting surface that rests on a circumference of the measuring tube.

4. The Coriolis mass flowmeter according to claim 1 , wherein at least the first stiffening element covers less than 40% the circumference of the measuring tube.

5. The Coriolis mass flowmeter according to claim 1 , wherein the stiffening element extends a distance perpendicular to the measuring tube that is greater, at least in sections, than a distance that the stiffening element extends in a circumferential direction of the measuring tube.

6. The Coriolis mass flowmeter according to claim 1 , wherein the extension of at least two components of the stiffening element extends a distance perpendicular to the measuring tube that is greater than a distance that the at least two components extend in a circumferential direction of the measuring tube.

7. The Coriolis mass flowmeter according to claim 1 , wherein a longitudinal extension of the at least two components of the stiffening element extends parallel to the longitudinal axis of the measuring tube.

8. The Coriolis mass flowmeter according to claim 1 , wherein the at least two components comprise at least two stiffening ribs, wherein the at least two stiffening ribs have a narrow edge that rests on the measuring tube.

9. The Coriolis mass flowmeter according to claim 8 , wherein the at least two stiffening ribs are arranged parallel to one another in such a way that the narrow edges of the ribs are arranged on the measuring tube on a circular arc.

10. The Coriolis mass flowmeter according to claim 1 , wherein the individual components of the stiffening element are connected by at least one arc-shaped connecting surface.

11. The Coriolis mass flowmeter according to claim 1 , wherein the at least one stiffening element is formed integrally with the node element.

12. The Coriolis mass flowmeter according to claim 1 , wherein the at least one node element has been applied directly to the measuring tube by a generative method.

13. The Coriolis mass flowmeter according to claim 1 , wherein at least the first stiffening element covers less than 20% the circumference of the measuring tube.

14. The Coriolis mass flowmeter according to claim 1 , wherein the at least two separately acting components or at least two separate components comprise a plurality of ribs which project from the node parallel to each other in an axial direction of the measuring tube.

15. A node element for use in a Coriolis mass flowmeter having at least one measuring tube, having at least one oscillation generator and at least two oscillation sensors and having at least two node elements, wherein the at least one oscillation generator excites the measuring tube to oscillation during operation, wherein the at least two node elements define the oscillation range and wherein at least one node element has at least one stiffening element, the node element comprising:
a body to which the at least one stiffening element is connected and having configuration adapted for being arranged on the measuring tube in such a manner that the at least one stiffening element increases the stiffness of the measuring tube with respect to the oscillations orthogonal to the excitation mode and to the Coriolis mode, so that, during operation, the oscillation frequency of the oscillation orthogonal to the excitation mode and to the Coriolis mode is greater than the oscillation frequency of the excitation mode,
wherein the first stiffening element has at least two separately acting components or at least two separate components.

16. The node element according to claim 15 , further comprising a second stiffening element, wherein the second stiffening element is arranged opposite to the first stiffening element on the node element.

17. The node element according to claim 15 , wherein the at least one stiffening element has a resting surface that rests on a circumference of the measuring tube.

18. The node element according to claim 15 , wherein the at least one stiffening element covers less than 40% the circumference of the measuring tube.

19. The node element according to claim 15 , wherein the at least one stiffening element extends a distance perpendicular to the measuring tube that is greater, at least in sections, than a distance that the at least one stiffening element extends in a circumferential direction of the measuring tube.

20. The node element according to claim 15 , wherein the at least two separately acting components or at least two separate components comprise a plurality of ribs which project from the node parallel to each other in an axial direction of the measuring tube.

Assignees

• Krohne Ag

Inventors

• Wang Tao

Classifications

• G01F1/845

  arrangements of measuring means, e.g., of measuring conduits · CPC title

• G01F1/8413 Primary

  means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments · CPC title

• G01F1/8422

  exciters · CPC title

• G01F1/8418 Primary

  motion or vibration balancing means · CPC title

• G01F1/849

  having straight measuring conduits · CPC title