Multi-Coil Electromagnetic Flowmeter for Large Diameter Measurement
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Solution Overview
Problem
Large diameter electromagnetic flowmeters require large and costly coils that are difficult to construct and install properly, necessitating a more efficient and cost-effective solution for generating a uniform magnetic field across the measuring section.
Innovation Solution
An electromagnetic flowmeter with a plurality of pairs of smaller coils installed along a plane perpendicular to the fluid flow, generating distinct magnetic fields that cover the cross section of the measuring section, allowing for even distribution and controlled interaction of magnetic fields using multiple pairs of coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If large diameter coils are used to generate magnetic field across the measuring section, then the magnetic field coverage is improved, but the construction difficulty and cost increase substantially
Solution Approach 1:
The patent divides the single large coil into multiple smaller coils arranged in pairs around the measuring section. Each coil pair generates a magnetic field component, and the combination of multiple pairs creates the complete magnetic field distribution across the large diameter measuring section. This segmentation makes each individual coil easier to manufacture and install while achieving the required overall magnetic field coverage.
2Area of stationary object
If large diameter coils are used to generate magnetic field across the measuring section, then the magnetic field coverage is improved, but the installation complexity increases
Solution Approach 1:
By segmenting the coil system into multiple smaller pairs, each pair can be independently installed and positioned around the measuring section. This reduces the handling difficulty and allows for more flexible installation procedures compared to installing a single large coil, thereby improving ease of operation while maintaining comprehensive magnetic field coverage.
3Ease of manufacture
If multiple pairs of smaller coils are used, then the construction ease and cost are improved, but the magnetic field distribution uniformity must be maintained
Solution Approach 1:
The patent applies local quality by positioning each coil pair at specific locations around the measuring section circumference. Each coil pair is designed to generate a magnetic field component that is optimized for its local position, and the collective arrangement ensures uniform overall distribution. This allows using smaller, easier-to-manufacture coils while maintaining the required magnetic field uniformity through careful spatial arrangement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables easier construction, reduces costs, and ensures accurate volumetric flow measurement by using smaller coils that generate evenly distributed magnetic fields, eliminating the need for large and expensive coils.
Implementation Method 1
electromagnetic flowmeters measure the velocity and volume of fluid on the basis of electrodynamic induction, where a magnetic field is generated by the electromagnetic flowmeter
Implementation Method 2
due to the interaction between the magnetic field and the conductive fluid flowing, a voltage perpendicular to the magnetic field and to the flow direction is generated
Data Source
AI summary
An electromagnetic flowmeter includes a measuring section configure to permit flow of fluid through the electromagnetic flowmeter, a plurality of pairs of coils installed on the circumference of the measuring section, and a transmitter which provides at least one driving current to excite the plurality pairs of coils, wherein the plurality of pairs of coils includes a first pair of coils capable of generating a first magnetic field within the measuring section, and a second pair of coils capable of generating a second magnetic field within the measuring section, where the first and second pairs of coils from the plurality of pairs of coils are installed along a first plane of the measuring section, and where the first plane is perpendicular to the flow of the fluid in the measuring section.