T-Shaped Magnetic Core for Flowmeter Flux Leakage
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Solution Overview
Problem
Magnetic flowmeters with small diameter process pipes face challenges in fitting coil shields around electrode isolation tunnels and maximizing magnetic flux, often experiencing elevated coil temperatures and flux leakage due to incomplete magnetic return paths.
Innovation Solution
A T-shaped magnetic core extending transversely from the flowtube with lateral arms provides a low reluctance magnetic return path, using high permeability materials to enhance flux efficiency, and a non-metallic winding spool to reduce thermal issues, allowing for easier testing and diagnostics by completing the magnetic circuit before housing assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a traditional coil configuration is used in small diameter flowtubes, then the magnetic flowmeter can be compact, but coil temperatures become elevated and magnetic flux leakage increases
Solution Approach 1:
A non-metallic spool acts as an intermediary component between the magnetic core and the coil windings. This spool provides thermal isolation, preventing heat transfer from the coil to the flowtube, thereby reducing coil temperature while maintaining the compact small diameter configuration
Solution Approach 2:
The magnetic core is segmented into a T-shaped configuration with separate arms that extend laterally from the stem. This segmentation creates distinct magnetic pathways and improves flux distribution, reducing flux leakage while maintaining compact dimensions
2Volume of moving object
If a traditional coil configuration is used in small diameter flowtubes, then the magnetic flowmeter can be compact, but magnetic flux leakage increases due to incomplete magnetic return paths
Solution Approach 1:
The magnetic core is segmented into a T-shaped configuration with a vertical stem and lateral arms. This segmentation creates complete magnetic return paths through the arms, ensuring efficient flux circulation and reducing leakage while maintaining compact small diameter dimensions
Solution Approach 2:
The magnetic core extends in multiple dimensions with lateral arms projecting perpendicular to the flowtube axis. This three-dimensional configuration creates efficient magnetic return paths that were not possible with traditional planar coil configurations, reducing flux leakage in the compact space
3Loss of energy
If more winding turns are used to increase magnetic flux, then flux generation improves, but coil temperature increases
Solution Approach 1:
The non-metallic spool serves as a thermal intermediary that isolates the coil from the flowtube, allowing increased winding turns to improve magnetic flux efficiency without proportionally increasing coil temperature, as the thermal path to the flowtube is blocked
Solution Approach 2:
The invention changes the material parameter of the spool from metallic to non-metallic, fundamentally altering the thermal conduction properties. This allows the system to accommodate more winding turns for improved flux generation while the non-conductive material prevents heat accumulation
4Object-affected harmful factors
If coil shields are fitted around electrode isolation tunnels, then electromagnetic shielding improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The T-shaped magnetic core structure merges multiple functions: it provides magnetic flux pathways through its arms, acts as a structural support for the coil windings via the non-metallic spool, and creates thermal isolation. This consolidation reduces the number of separate components needed, simplifying the overall device structure while maintaining electromagnetic shielding effectiveness
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
This configuration reduces coil temperature by 40°C, decreases the number of winding turns by 35-44%, and simplifies testing while maintaining signal strength, improving flux generation efficiency and part count reduction.
Implementation Method 1
provides a low reluctance magnetic return path
Implementation Method 2
using high permeability materials to enhance flux efficiency
Implementation Method 3
Due to Faraday's Law of electromagnetic induction, a voltage or Electromotive Force (EMF) is generated between the pair of electrodes disposed in the process fluid
Data Source
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AI summary
A flowtube assembly for a magnetic flowmeter (150) is provided. The flowtube assembly includes a flowtube (156) configured to receive a flow of process fluid therethrough. A magnetic core (152) is mounted relative to the flowtube (156) and includes a stem (157) extending from the flowtube (156) to a pair of arms. Each of the arms (153, 155) extends away from the stem (157). A spool (182) having a plurality of magnetic windings (164) is disposed about the stem (157) and spaces the plurality of windings (164) from the flowtube (156).