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Method and apparatus for bonding connecting ring to flow tube and balance bar of Coriolis flowmeter

A Coriolis flowmeter and connecting ring technology, applied in the field of connecting rings

Inactive Publication Date: 2008-11-19
MICRO MOTION INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The same problem arises when the flow tube is made of titanium and the connecting ring and balance bar are made of stainless steel or when any part to be brazed has a different coefficient of thermal expansion than any other part

Method used

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  • Method and apparatus for bonding connecting ring to flow tube and balance bar of Coriolis flowmeter
  • Method and apparatus for bonding connecting ring to flow tube and balance bar of Coriolis flowmeter
  • Method and apparatus for bonding connecting ring to flow tube and balance bar of Coriolis flowmeter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0148] Description of Figures 1 and 2

[0149] FIG. 1 discloses a cross-section of a prior art flow meter 100 having a housing 106 surrounding a balance bar 102 and a flow tube 101 . The ends of flow tube 101 extend beyond housing ends 107 and 108 to flanges (not shown) which allow flowmeter 100 to be connected to a pipeline whose flow is to be measured. Meter electronics 125 is connected to flow meter 100 via leads 122, 123 and 124 to control its operation and receive output signals from sensors (speed sensors) LPO and RPO. Meter electronics process the received information and transmit output information representative of the stream via conductor 126 to a utility circuit not shown. Meter electronics apply a signal via path 123 to driver D, which vibrates flow tube 101 and balance bar 102 in opposite phases in a well known manner. Vibration of flow tube 101 with material flow induces a Coriolis response in flow tube 101 . The magnitude of the Coriolis response is indicativ...

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PUM

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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.

Description

technical field [0001] The present invention relates to an adapter ring for a Coriolis flowmeter, and more particularly to a method and apparatus capable of joining components of a Coriolis flowmeter having different coefficients of thermal expansion. Background technique [0002] Single tube Coriolis flowmeters typically have a balance bar that surrounds the flow tube and an intervening annular connecting ring that connects the ends of the balance bar to the flow tube. Connecting rings are often brazed to the balance bar and flow tubes to form a strong and permanent connection. The integrity of the brazed joint is important because in operation the balance bar and the material filling the flow tube vibrate in anti-phase. Flow tube vibration is necessary to create Coriolis acceleration on the flowing material, and balance bar vibration is necessary to balance the vibrating flow tube. The connecting ring and its brazed joint ensure that the flow tube, connecting ring and ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/84
CPCG01F1/8418G01F1/8409G01F1/849G01F1/8413Y10T29/49927Y10T29/49865Y10T29/49885Y10T29/49913G01F1/84
Inventor C·B·范克莱维
Owner MICRO MOTION INC