CA2420163A1 - Method and apparatus for bonding a connecting ring to a flow tube and balance bar of a coriolis flowmeter - Google Patents

Method and apparatus for bonding a connecting ring to a flow tube and balance bar of a coriolis flowmeter Download PDF

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Publication number
CA2420163A1
CA2420163A1 CA002420163A CA2420163A CA2420163A1 CA 2420163 A1 CA2420163 A1 CA 2420163A1 CA 002420163 A CA002420163 A CA 002420163A CA 2420163 A CA2420163 A CA 2420163A CA 2420163 A1 CA2420163 A1 CA 2420163A1
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CA
Canada
Prior art keywords
balance bar
flow tube
circumferential surface
rings
connecting rings
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002420163A
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French (fr)
Other versions
CA2420163C (en
Inventor
Craig Brainerd Van Cleve
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Micro Motion Inc
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Micro Motion, Inc.
Craig Brainerd Van Cleve
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Publication of CA2420163A1 publication Critical patent/CA2420163A1/en
Application granted granted Critical
Publication of CA2420163C publication Critical patent/CA2420163C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
    • G01F1/8413—Coriolis or gyroscopic mass flowmeters constructional details means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
    • G01F1/8413—Coriolis or gyroscopic mass flowmeters constructional details means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments
    • G01F1/8418—Coriolis or gyroscopic mass flowmeters constructional details means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments motion or vibration balancing means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/845—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits
    • G01F1/8468—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits
    • G01F1/849—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having straight measuring conduits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y10T29/49865—Assembling or joining with prestressing of part by temperature differential [e.g., shrink fit]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49885—Assembling or joining with coating before or during assembling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49909—Securing cup or tube between axially extending concentric annuli
    • Y10T29/49913—Securing cup or tube between axially extending concentric annuli by constricting outer annulus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49925—Inward deformation of aperture or hollow body wall
    • Y10T29/49927—Hollow body is axially joined cup or tube

Abstract

A Coriolis flowmeter having a single flow tube surrounded by connecting rings (503, 1003, 1403) and a balance bar (502, 1402A, 1402B) whose ends are connected by the connecting rings to a flow tube (101). The balance bar has a thermal coefficient of expansion greater than that of the connecting rings and the flow tube. The outer circumferential surface (512, 1404) of each connecting ring is tapered toward the axial center of the flow tube. The inner circumferential surface (505, 1404) of the balance bar has a taper matching that of the connecting ring. The connecting ring can only partially inserted into the space between the flow tube and the balance bar when the assembly is at room temperature.

Claims (39)

1. A Coriolis flowmeter having:
a flow tube (101);
connecting ring means (503, 1003, 1403) having a center opening through which said flow tube extends;
a tubular balance bar (502, 1402A, 1402B) coaxial with said flow tube and surrounding an axial portion of said flow tube;
axial end portions (509) of said balance bar coaxial with and surrounding at least a portion of said connecting ring means;
an inner circumferential surface (501, 1417) of said connecting ring means coupled to an outer circumferential surface of said flow tube;
characterized in that:
an outer circumferential surface (512, 1404) of said connecting ring means is tapered with a decreasing radius in a first direction with respect to the axial center of said flow tube;
an inner circumferential surface (505, 1404) of said end portions of said balance bar has a taper that matches said taper of said connecting ring means;
said tapered inner circumferential surface of said end portions of balance bar is affixed by bond material (806) to said tapered outer circumferential surface of said connecting ring means.
2. The Coriolis flowmeter of claim 1 characterized in that said connecting ring means comprises:
a first connecting ring (503, 1403) and a second connecting ring (503, 1403);
said tapered outer circumferential surface (1404, 510) of said first connecting ring is bonded to said tapered inner circumferential surface of a first end portion of said balance bar;
said tapered outer circumferential surface (1404, 510) of said second connecting ring is bonded to said tapered inner circumferential surface of a second end portion of said balance bar.
3. The Coriolis flowmeter of claim 2 characterized in that said bond material is braze material.
4. The Coriolis flowmeter of claim 2 characterized in that said flow tube and said balance bar have different thermal coefficients of expansion.
5. The Coriolis flowmeter of claim 2 characterized in that said balance bar has a greater thermal coefficient of expansion than does said flow tube.
6. The Coriolis flowmeter of claim 2 characterized in that said first direction defines a taper (510) that has a decreasing radius towards the axial center of said flow tube.
7. The Coriolis flowmeter of claim 2 characterized in that said first direction defines a taper (1404) that has an increasing radius towards the axial center of said flow tube.
8. The Coriolis flowmeter of claim 2 characterized in that said balance bar comprises a first (1002A) and a second (1002B) balance bar segments having axial end portions (1236, 1237) connected to each other by spring means (1240) to accommodate a differential coefficient of expansion between said flow tube and said balance bar.
9. The Coriolis flowmeter of claim 2 characterized in that said balance bar comprises an integral elongated member (502).
10. The Coriolis flowmeter of claim 2 characterized in that said outer circumferential surface of said flow tube (501) is affixed by bond material (506) to said inner circumferential surfaces of said first and second connecting rings (503).
11. The Coriolis flowmeter of claim 10 in which said bond material (506) comprises braze material.
12. The Coriolis flowmeter of claim 11 characterized in that said balance bar has a thermal coefficient of expansion greater than that of said first and second connecting rings and that said first and second connecting rings have a coefficient of expansion equal to that of said flow tube.
13. The Coriolis flowmeter of claim 10 further including a step (808) on said inner tapered circumferential surface of said balance bar (805) that engages an axial inner end (804) of said first and second connecting rings (803) to limit the amount by which said first and second connecting rings can be axially inserted into said balance bar.
14. The Coriolis flowmeter Coriolis flowmeter of claim 2 further comprising:
first and second annular tube rings (1007) coaxial with and encircling said flow tube;
said outer circumferential surface of said flow tube (1004) is affixed by bond material (1006) to an inner circumferential surfaces of said first and second annular tube rings;
an outer circumferential surface (1008) of each of said first and second annular tube rings is tapered with an axially increasing radius towards said axial center of said flow tube;
said inner circumferential surface of said first and second connecting rings has a taper that matches the taper (1008) of said first and second annular tube rings and has a diameter that increases radially towards the axial center of said balance bar;
said inner circumferential surface of said first and second connecting rings is affixed by bond material to said outer circumferential surface of said first and second annular tube rings.
15. The Coriolis flowmeter of claim 14 further including a step (1111) on said inner circumferential surface of said balance bar that engages the axial inner end (1112) of said first and second connecting rings means to limit the amount by which said first and second connecting rings can be axially inserted into said balance bar.
16. The Coriolis flowmeter of claim 14 characterized in that said balance bar has a thermal coefficient of expansion greater than that of said first and second connecting rings and that said first and second connecting rings have a thermal coefficient of expansion greater than that of said first and second annular tube rings and that of said flow tube.
17. The Coriolis flowmeter of claim 14 characterized in that said first and second connecting rings and said first and second annular tube rings and said balance bar have different thermal coefficients of expansion.
18. The Coriolis flowmeter of claim 14 characterized in that said bond material is braze material (1006).
19. A method of assembling a Coriolis flowmeter having a flow tube, a connecting ring means, and a tubular balance bar, said method comprising the steps of:
extending said flow tube through a center opening in said tubular balance bar;
positioning said connecting ring means so that axial end portions of said balance bar are coaxial with and surround at least a portion of said connecting ring means;
positioning said flow tube so that said flow tube extends through a center opening of said connecting ring means and is coaxial with said balance bar;
coupling an axial inner circumferential surface of said connecting ring means to said flow tube;
characterized in that:
an outer circumferential surface of said connecting ring means is tapered in a first direction with a decreasing radius with respect to the axial center of said flow tube;
inner circumferential surfaces of said axial end portions of said balance bar have a taper that matches said taper of said connecting ring means; and bonding said tapered inner circumferential surface of said end portions of balance bar to said tapered outer circumferential surface of said connecting ring means.
20. The method of claim 19 characterized in that said connecting ring means comprises a first connecting ring and a second connecting ring; said step of bonding comprises the step of brazing.
21. The method of claim 20 characterized in that said flow tube and said balance bar have different thermal coefficients of expansion and that said step of brazing comprises the steps of:
brazing said tapered inner circumferential surface of first and second end portions of balance bar to said tapered outer circumferential surfaces of said first and second connecting rings.
22. The method of claim 21 characterized in that said first direction defines a taper having a decreasing radius towards the center of said flow tube.
23. The method of claim 20 characterized in that said balance bar has a greater thermal coefficient of expansion than said flow tube and that said step of brazing comprises the steps of:
brazing said tapered inner circumferential surfaces of said first and second end portions of balance bar with said tapered outer circumferential surfaces of first and second said connecting rings;
axially moving said first and second connecting rings towards said axial center of said balance bar during said step of brazing; and cooling said brazed surfaces so that said greater thermal coefficient of expansion of said balance bar generates a radially compressive force against said first and second connecting rings and said flow tube.
24. The method of claim 21 characterized in that said step of coupling includes the step of bonding said outer circumferential surface of said flow tube to said inner circumferential surfaces of said first and second connecting rings.
25. The method of claim 24 in which said step of bonding includes the step of brazing.
26. The method of claim 25 characterized in that said balance bar has a thermal coefficient of expansion greater than that of said first and second connecting rings and that said first and second connecting rings have a coefficient of expansion equal to that of said flow tube, said step of bonding includes the step of brazing said outer circumferential surface of said flow tube to said inner circumferential surface of said first and second connecting rings; and axially moving said first and second connecting rings towards said axial center of said balance bar during said step of brazing.
27. The method of claim 26 further including the step of forming a step on said inner tapered circumferential surface of said balance bar that engages axial inner ends of said first and second connecting rings to limit the amount by which said first and second connecting rings can be axially inserted into said balance bar.
28. The method of claim 20 characterized in that:
first and second annular tube rings couple said flow tube with said first and second connecting rings; said method further includes the step of:
bonding said outer circumferential surface of said flow tube to an inner circumferential surface of each of said first and second annular tube rings;
an outer circumferential surface of said first and second annular tube rings is tapered to have an axially increasing radius towards said axial center of said flow tube;
said inner circumferential surface of said first and second connecting rings have a taper that matches that of said first and second annular tube rings and has a radius that increases towards the axial mid portion of said balance bar; and bonding said tapered inner circumferential surface of said first and second connecting rings to said tapered outer circumferential surface of said first and second annular tube rings.
29. The method of claim 28 in which said step of bonding includes the step of brazing; and said method further includes the step of:
axially moving said first and second connecting rings towards said axial center of said balance bar during said step of brazing.
30. The method of claim 29 further including the step of forming a step on said inner circumferential surface of said balance bar that engages the axial inner end of said first and second connecting rings to limit the amount by which said first and second connecting rings can be axially inserted into said balance bar during said step of brazing.
31. The method of claim 28 characterized in that said balance bar has a thermal coefficient of expansion greater than that of said first and second connecting rings and that said first and second connecting rings have a thermal coefficient of expansion greater than that of said first and second annular tube rings and that of said flow tube and that said step of bonding includes the step of brazing;
said method further includes the step of axially moving said first and second connecting rings towards said axial center of said balance bar during said step of brazing.
32. The method of claim 28 characterized in that said first and second connecting rings and said first and second annular tube rings and said balance bar have different thermal coefficients of expansion and that said step of bonding includes the step of brazing;
said method further includes the step of axially moving said first and second connecting rings towards said axial center of said balance bar during said step of brazing.
33. The method of claim 28 further including the steps of:
orienting said flow tube and said balance bar so that a first end of said flow tube extends into a recess of a base;

placing said first and second connecting rings concentric with said flow tube and axially at least partially within first and second ends of said balance bar so that the outer ends of said connecting rings extend axially beyond the ends of said balance bar;
placing braze material proximate the axial end extremities of the junctions of surfaces common to said balance bar and said first and second connecting rings and junctions of surfaces common to said connecting rings and said flow tube;
placing a mass having a center recess on a second end of said flow tube so that said mass exerts a force on said connecting rings urging them axially into engagement with said balance bar; the outer ends of said connecting ring then extending axially beyond the ends of said balance bar;
heating said balance bar and said connecting rings and said flow tube to brazing temperatures;
the brazing temperature being effective to expand said balance bar radially to enable said connecting rings to move axially inward within said balance bar; and cooling said brazed surfaces so that said greater thermal coefficient of expansion of said balance bar generates a radially compressive force against said first and second connecting rings and said flow tube.
34. The method of claim 33 characterized in that said balance bar comprises first and a second axially separated segments and that said method further comprises the steps of connecting spring means between the axial inner end of each of said balance bar segments to accommodate a differential thermal coefficient of expansion between said flow tube and said balance bar segments.
35. The method of claim 21 characterized in that said first direction defines a taper having an increasing radius towards the center of said flow tube.
36. The method of claim 35 characterized in that said balance bar has a greater thermal coefficient of expansion than said flow tube and that said step of bonding comprises the steps of:

brazing said tapered inner circumferential surfaces of said first and second end portions of balance bar with said tapered outer circumferential surfaces of first and second said connecting rings;
axially moving said first and second end portions of said balance bar towards said axial center of said balance bar during said step of brazing; and cooling said brazed surfaces so that said greater thermal coefficient of expansion of said balance bar generates a radially compressive force against said first and second connecting rings and said flow tube.
37. The method of claim 35 characterized in that said balance bar has a thermal coefficient of expansion greater than that of said first and second connecting rings and that said first and second connecting rings have a thermal coefficient of expansion greater than that of said flow tube and that said step of bonding includes the step of brazing;
said method further includes the step of axially moving said first and second end portions of said balance bar towards said axial center of said balance bar during said step of brazing.
38. The method of claim 37 characterized in that said balance bar comprises a pair of axially separated segments and that said method further includes the steps of:
extending a first end of said flow tube through a center opening of said first connecting ring;
extending a second end of said flow tube through a center opening of a second connecting ring;
affixing said first and second connecting rings to said flow tube;
extending said first end of said flow tube and said first connecting ring through a first balance bar segment;
extending said second end of said flow tube and said second connecting ring through a said second balance bar segment;
placing braze material proximate the axial extremities said first and second connecting rings proximate said flow tube and said balance bar segments;

exerting a force on said balance bar segments urging them towards an axial center of flow tube and said balance bar;
heating said balance bar segments and said connecting rings and said flow tube to brazing temperatures;
the brazing temperature being effective to expand said balance bar radially to enable said balance bar end segments to move axially inward toward said axial center of said flow tube and said balance bar; and, cooling said brazed surfaces so that said greater thermal coefficient of expansion of said balance bar segments generates a radially compressive force against said first and second connecting rings and said flow tube.
39. A method of assembling the Coriolis flowmeter of claim 1, said method comprising the steps of:
extending said flow tube through a center opening in said tubular balance bar;
positioning said connecting ring means so that axial end portions of said balance bar are coaxial with and surround at least a portion of said connecting ring means;
positioning said flow tube so that said flow tube extends through a center opening of said connecting ring means and is coaxial with said balance bar;
coupling an axial inner circumferential surface of said connecting ring means to said flow tube;
said outer circumferential surface of said connecting ring means is tapered in a first direction with a decreasing radius with respect to the axial center of said flow tube;
said inner circumferential surfaces of said axial end portions of said balance bar have a taper that matches said taper of said connecting ring means; and bonding said tapered inner circumferential surface of said end portions of balance bar to said tapered outer circumferential surface of said connecting ring means.
CA002420163A 2000-09-22 2001-09-05 Method and apparatus for bonding a connecting ring to a flow tube and balance bar of a coriolis flowmeter Expired - Lifetime CA2420163C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/668,559 US6634241B1 (en) 2000-09-22 2000-09-22 Method and apparatus for bonding a connecting ring to a flow tube and balance bar of a coriolis flowmeter
US09/668,559 2000-09-22
PCT/US2001/042049 WO2002025224A1 (en) 2000-09-22 2001-09-05 Method and apparatus for bonding a connecting ring to a flow tube and balance bar of a coriolis flowmeter

Publications (2)

Publication Number Publication Date
CA2420163A1 true CA2420163A1 (en) 2002-03-28
CA2420163C CA2420163C (en) 2009-11-17

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CA002420163A Expired - Lifetime CA2420163C (en) 2000-09-22 2001-09-05 Method and apparatus for bonding a connecting ring to a flow tube and balance bar of a coriolis flowmeter

Country Status (13)

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US (2) US6634241B1 (en)
EP (1) EP1320725B1 (en)
JP (1) JP4986368B2 (en)
KR (1) KR100571362B1 (en)
CN (1) CN100434877C (en)
AR (1) AR030787A1 (en)
AU (1) AU2001291287A1 (en)
BR (1) BR0113981B1 (en)
CA (1) CA2420163C (en)
HK (1) HK1059816A1 (en)
MX (1) MXPA03002511A (en)
RU (1) RU2246698C2 (en)
WO (1) WO2002025224A1 (en)

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US6634241B1 (en) 2003-10-21
US20030079554A1 (en) 2003-05-01
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KR100571362B1 (en) 2006-04-17
JP4986368B2 (en) 2012-07-25

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