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An electromagnetic flowmeter with adjustable coil and shield assembly

An electromagnetic flowmeter and shielding technology, which is used in the application of electromagnetic flowmeters to detect fluid flow, volume/mass flow generated by electromagnetic effects, liquid/fluid solid measurement, etc.

Pending Publication Date: 2021-06-29
ABB (SCHWEIZ) AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, modifications to the size and shape of the duct cross-section present fabrication and installation challenges, and also result in pressure drops along the flowline

Method used

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  • An electromagnetic flowmeter with adjustable coil and shield assembly
  • An electromagnetic flowmeter with adjustable coil and shield assembly
  • An electromagnetic flowmeter with adjustable coil and shield assembly

Examples

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Embodiment Construction

[0023] The present invention relates to measuring the flow rate of a fluid flowing in a pipe by means of an electromagnetic flowmeter installed downstream of a bend in the pipe. Typically, an electromagnetic flowmeter consists of a conduit covered with a liner / bushing or fluid-carrying insulating tube, with two solenoid coils on the top and bottom of the insulating tube or bushing, and one inserted into the side of the bushing. The counter electrode is used for measurement, and the magnetic cover encloses all elements containing the generated magnetic field and ensures a stronger magnetic field for interaction with the fluid. When the coil is energized, an electromotive force (EMF) is induced within the fluid. By measuring this EMF using electrodes, the flow rate is estimated. EMF divided by velocity is the calibration factor for a given flowmeter. Calibration factors are obtained under ideal laboratory conditions using a straight section of pipe upstream of the flowmeter. ...

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Abstract

The present invention relates to a an electromagnetic flowmeter for measuring flow of fluid flowing in a conduit of the electromagnetic flowmeter, wherein the electromagnetic flowmeter comprises: a coil attached to the conduit and excited by an excitation unit to generate an electromagnetic field to interact with the fluid flowing in the conduit, a shield magnetically coupled with the coil, a pair of electrodes mounted on the conduit for measuring potential difference generated by the interaction of the electromagnetic field in the fluid; and wherein the at least one coil and the at least one shield is provided with an arrangement to displace the at least one of the at least one coil and the at least one shield to adjust the interaction of the electromagnetic field with the fluid.

Description

technical field [0001] The present invention relates generally to an electromagnetic flowmeter, and more particularly to an electromagnetic flowmeter assembly having an adjustable coil and shield assembly. Background technique [0002] The measurement of the flow of fluid through a conduit or pipe can be done in a number of ways, like using an electromagnetic flowmeter. [0003] A typical electromagnetic flowmeter uses Faraday's law of electromagnetic induction. An electromagnetic field is applied within the flow tube for the flow of fluid with a certain level of conductivity. The electromotive force (EMF) induced due to the interaction of the electromagnetic field with the fluid molecules (ions in the fluid) is measured using electrodes placed on the sidewall of the pipe. The measured EMF is proportional to flow and is therefore used to measure flow rate. Although attractive in view of the accuracy and simplicity of construction of the electromagnetic flowmeter, the cond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/58G01F25/00
CPCG01F1/586G01F25/10G01F1/588G01F1/60
Inventor S·达斯古普塔
Owner ABB (SCHWEIZ) AG