Electromagnetic flow meter having an earth ring with a ring plate part and a wall part formed along an outer periphery

Patent metadata

Field	Value
Publication number	US-9541430-B2
Application number	US-201514644741-A
Country	US
Kind code	B2
Filing date	Mar 11, 2015
Priority date	Mar 12, 2014
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

An electromagnetic flow meter includes a measurement tube having a flange part, the flange part being configured to be coupled to a piping-side flange by a bolt fastening, a lining material configured to cover an inside of the measurement tube and an inner periphery area having a predetermined diameter of a coupling-side surface of the flange part, and an earth ring configured to be placed between the flange part and the piping-side flange. The earth ring has a ring plate part and a wall part formed along an outer periphery of the ring plate part.

First claim

What is claimed is:

1. An electromagnetic flow meter comprising:
a measurement tube having a flange part, the flange part being configured to be coupled to a piping-side flange by a bolt fastening;
a lining material configured to cover an inside of the measurement tube and an inner periphery area having a predetermined diameter of a coupling-side surface of the flange part, and
an earth ring configured to be placed between the flange part and the piping-side flange,
wherein the earth ring has a ring plate part and a wall part formed along an outer periphery of the ring plate part
wherein a thickness of the earth ring is changed on a surface thereof facing the lining material.

2. The electromagnetic flow meter according to claim 1 , wherein an inner diameter of the wall part is configured to be greater than the predetermined diameter of the coupling-side surface of the flange part covered by the lining material.

3. The electromagnetic flow meter according to claim 2 , wherein the lining material is contacted to the wall part by deformation thereof caused due to compression, when the flange part and the piping-side flange are coupled by the bolt fastening.

4. The electromagnetic flow meter according to claim 2 , wherein the lining material is contacted to the wall part by deformation thereof caused due to a pressure applied from a fluid to be measured, after the flange part and the piping-side flange are coupled by the bolt fastening.

5. The electromagnetic flow meter according to claim 1 , wherein the earth ring is thicker at an outer peripheral part thereof than at an inner peripheral part thereof.

6. The electromagnetic flow meter according to claim 1 , wherein the thickness is changed by a recess or projection formed at the earth ring.

7. An electromagnetic flow meter comprising:
a measurement tube having a flange part, the flange part being configured to be coupled to a piping-side flange by a bolt fastening;
a lining material configured to cover an inside of the measurement tube and an inner periphery area having a predetermined diameter of a coupling-side surface of the flange part;
an earth ring configured to be placed between the flange part and the piping-side flange, and
an annular wall ring configured to be placed between the flange part and the earth ring and having an inner diameter greater than the predetermined diameter of the coupling-side surface of the flange part covered by the lining material,
wherein the earth ring and the annular wall ring are separately-formed.

8. The electromagnetic flow meter according to claim 7 , wherein the lining material is contacted to the wall ring by deformation thereof caused due to compression, when the flange part and the piping-side flange are coupled by the bolt fastening.

9. The electromagnetic flow meter according to claim 7 , wherein the lining material is contacted to the wall ring by deformation thereof caused due to a pressure applied from a fluid to be measured, after the flange part and the piping-side flange are coupled by the bolt fastening.

10. The electromagnetic flow meter according to claim 7 , wherein a surface of the flange part facing the earth ring or a surface of the earth ring facing the flange part has a recess configured to fit therein the wall ring.

11. The electromagnetic flow meter according to claim 7 , wherein a thickness of the earth ring is changed on a surface thereof facing the lining material.

12. The electromagnetic flow meter according to claim 11 , wherein the earth ring is thicker at an outer peripheral part thereof than at an inner peripheral part thereof.

13. The electromagnetic flow meter according to claim 11 , wherein the thickness is changed by a recess or projection formed at the earth ring.

14. An electromagnetic flow meter comprising:
a measurement tube having a flange part, the flange part being configured to be coupled to a piping-side flange by a bolt fastening;
a lining material configured to cover an inside of the measurement tube and an inner periphery area having a predetermined diameter of a coupling-side surface of the flange part, and
an earth ring configured to be placed between the flange part and the piping-side flange,
wherein the flange part has a projection which is circumferentially formed on the coupling-side surface of the flange part to surround the lining material.

15. The electromagnetic flow meter according to claim 14 , wherein a thickness of the earth ring is changed on a surface thereof facing the lining material.

16. The electromagnetic flow meter according to claim 15 , wherein the earth ring is thicker at an outer peripheral part thereof than at an inner peripheral part thereof.

17. The electromagnetic flow meter according to claim 15 , wherein the thickness is changed by a recess or projection formed at the earth ring.

Assignees

• Yokogawa Electric Corp

Inventors

• Yamashita Hideaki
• Imai Yoichi
• Kuroki Yoshihiko
• Omura Koji

Classifications

• G01F1/58 Primary

  by electromagnetic flowmeters · CPC title

• F16L23/18

  the sealing means being rings · CPC title

• G01F1/586 Primary

  constructions of coils, magnetic circuits, accessories therefor (G01F1/582 takes precedence; magnet; inductances; transformers; selection of materials for their magnetic properties per se H01F) · CPC title

• F16L23/02

  the flanges being connected by members tensioned axially (F16L23/12 takes precedence) · CPC title