Flowmeter Coil System with Integrated Field Guide-Back
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Solution Overview
Problem
Magnetically inductive flowmeters face inefficiencies due to magnetic field degradation at connections between coil cores and field guides, leading to increased material usage and overheating from numerous winding layers.
Innovation Solution
A magnetically inductive flowmeter design with a coil system and pole shoes that extend the magnetic field tangentially along the measuring tube axis, using a field guide-back that integrates with the coil core to minimize magnetic resistance and reduce the number of winding layers, along with a shielding apparatus to mitigate external disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a field guide is used to lead the magnetic field between coils, then the magnetic field distribution is improved, but magnetic connections between coil cores and field guide create magnetic resistance that degrades flowmeter performance
Solution Approach 1:
The patent merges the field guide and coil core into a single integrated component. The field guide-back extends through the coil and forms the coil core, eliminating the separate field guide structure and its connections to the coil core. This integration removes the magnetic resistance interfaces while maintaining magnetic field guidance functionality.
2Power
If many turns of coil wire are applied in a narrow spatial region, then the magnetic field production is concentrated, but this requires many winding layers that increase material cost and reduce heat emission
Solution Approach 1:
The patent repositions the coil tangentially along the measuring tube axis rather than radially, utilizing the longitudinal dimension of the measuring tube. This allows the coil to be distributed along the tube length, reducing the need for multiple winding layers in a narrow radial space while maintaining magnetic field production effectiveness.
3Ease of manufacture
If many winding layers are used to achieve many turns in a narrow region, then coil production is feasible, but heat emission is lessened and costly raw materials are wasted
Solution Approach 1:
By orienting the coil tangentially along the measuring tube axis, the patent distributes the winding along the longitudinal dimension rather than concentrating it radially. This reduces the number of winding layers needed, improving heat dissipation and reducing material usage while maintaining manufacturability through a different 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
This design enhances the magnetic field distribution, reduces material consumption, minimizes overheating, and increases the switching frequency and measurement duration by maintaining a homogeneous magnetic field and reducing magnetic interference.
Implementation Method 1
a magnet system for producing a magnetic field that extends perpendicularly to the measuring tube axis
Implementation Method 2
measuring an electrical voltage induced in an electrically conductive medium by a magnetic field
Implementation Method 3
the pole shoes are adapted to transfer the magnetic field produced by the coil system into the measuring tube as well as to receive the magnetic field that has passed through the measuring tube and to lead the magnetic field back to the coil system
Implementation Method 4
a means for field guide-back that is adapted to lead the magnetic field outside of the measuring tube between the pole shoes, wherein the means for field guide-back has at least one guide-back part that extends through at least one coil and forms the coil core
Data Source
AI summary
A magnetically inductive flowmeter includes a measuring tube having a tube axis and a tube wall; a magnet system for producing a magnetic field that extends perpendicularly to the tube axis; at least one pair of measuring electrodes for sensing an electrical voltage induced in the medium by the magnetic field; and an electronic measuring/operating circuit for operating the magnet system and the measuring electrodes. The magnet system includes a coil system having a coil having a coil core and further includes two pole shoes. The coil system includes a field guide-back, wherein a tangential fraction of the magnetic field in the coil relative to the measuring tube axis amounts to at least 90% of the total magnetic field. The field guide-back has a guide-back part that extends through the coil and forms the coil core of the coil.