Magnetic-Inductive Flowmeter With Circumferential Coils for Profile Changes
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Solution Overview
Problem
Magnetic-inductive flowmeters are sensitive to changes in flow profiles, leading to inaccuracies in flow measurements due to disturbances and asymmetries in the flow profile, particularly in pipe systems with tees or curved pipes.
Innovation Solution
The flowmeter design includes coils arranged circumferentially around the measuring tube, with at least three coils and measuring electrodes positioned between two coils, allowing for variable magnetic field directions and multiple measuring paths to average flow information independently of the flow profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional magnetic-inductive flowmeter design is used, then measurement principle is simple and reliable, but measurement precision deteriorates due to sensitivity to flow profile changes and asymmetries
Solution Approach 1:
The flowmeter is divided into multiple measurement sections with separate measuring electrodes and magnetic field generation zones. Each section independently measures flow characteristics, and the results are combined to provide an overall flow measurement that is less sensitive to local flow profile variations and asymmetries.
Solution Approach 2:
The patent introduces a spatial distribution dimension by arranging measuring electrodes and magnetic field generators at multiple positions around the flow cross-section. This multi-dimensional arrangement allows the system to integrate flow information from different spatial locations, reducing sensitivity to flow profile changes and asymmetries while maintaining measurement accuracy.
2Reliability
If multiple coils and measuring electrodes are arranged circumferentially, then sensitivity to flow profile changes is reduced, but device complexity increases
Solution Approach 1:
The circumferentially arranged coils and measuring electrodes serve multiple functions: they generate magnetic fields for measurement, detect induced voltages from flow elements, and provide spatial distribution of measurement data. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while improving measurement stability.
Solution Approach 2:
The patent combines multiple measuring sections into a single integrated flowmeter device, where coils and measuring electrodes are arranged in a unified circumferential configuration. This merging approach allows the system to achieve reduced sensitivity to flow profile changes through distributed measurement while avoiding the complexity of multiple separate devices.
3Adaptability or versatility
If at least three coils and measuring electrodes are provided in circumferential direction, then flow information can be averaged independently of flow profile, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by providing at least three coils and measuring electrodes at specific circumferential positions where they can effectively sample flow characteristics. This localized arrangement at critical positions enables the system to average flow information and achieve flow profile independence without requiring high precision throughout the entire device structure.
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 reduces the sensitivity to flow profile changes, enabling accurate flow measurements by averaging over asymmetrical profiles and providing improved flow measurement values through multiple orientations and electrode configurations.
Implementation Method 1
a magnetic field device (3) having a plurality of coils (4) for generating a magnetic field (B) which passes through the measuring tube (2) at least partially perpendicular to the direction of flow of the medium
Implementation Method 2
a magnetic field guide device (5) for guiding the magnetic field (B) in regions outside the measuring tube (2)
Data Source
AI summary
A magnetic-inductive flowmeter includes a measuring tube for guiding an electrically conductive medium, a magnetic field device, a magnetic field guiding device, and a control and evaluation unit. The magnetic field device includes at least three coils for generating a magnetic field through the measuring tube. The magnetic field guiding device guides the magnetic field with at least three measuring electrodes for tapping a measurement voltage induced in the medium. The control and evaluation unit generates the magnetic field by energizing the coils and evaluates the measurement voltage. The coils are distributed over a circumference of the magnetic field guiding device, which acts a coil core in a region of the coils, so that the coils are arranged with their coil longitudinal axes in the circumferential direction with respect to the measuring tube. Each of the measuring electrodes is arranged between two coils in the radial direction.