Magnetically Inductive Flow Meter Single Magnet System
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Solution Overview
Problem
Existing magneto-inductive flow meters require multiple magnet systems, increasing material costs and complexity, with superimposed or angled magnetic fields leading to inefficiencies and spatial expansion issues.
Innovation Solution
A single magnet system with a coil and permanent magnet generating a selectable magnetic field, using a remanent magnetic field oriented transversely to the measuring tube, and an electronic operating circuit to switch between modes for flow rate and velocity measurements based on voltage changes, reducing material costs and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single magnet system with coil and permanent magnet is used, then material costs and device complexity are reduced, but the ability to generate selectable magnetic fields for different measurement modes becomes limited
Solution Approach 1:
The patent combines the coil system and permanent magnet system into a single integrated magnet system. The coil generates a first magnetic field while the permanent magnet provides a second magnetic field, and these fields are superimposed to create a homogeneous measurement magnetic field in the measuring tube, eliminating the need for separate magnet systems
Solution Approach 2:
The operating circuit switches between different operating modes by periodically activating the coil to generate the first magnetic field. In the first operating mode, the coil is activated to create a time-varying magnetic field for accurate flow measurement. In the second operating mode, the coil remains inactive and only the permanent magnet's magnetic field is used for flow monitoring, reducing energy consumption
2Measurement precision
If the magnetic field oscillates around a zero point, then measurement accuracy is improved, but the compact arrangement of magnet systems becomes difficult
Solution Approach 1:
The patent merges the coil and permanent magnet into a single magnet system where their magnetic fields are superimposed. The coil generates a first magnetic field that oscillates around zero, while the permanent magnet provides a second magnetic field. Together they create a homogeneous measurement magnetic field that oscillates around a zero point, ensuring accurate flow measurement while maintaining a compact structure
Solution Approach 2:
The operating circuit dynamically changes the magnetic field parameters by switching the coil activation state. When the coil is activated, it generates a time-varying magnetic field with specific strength and direction. When inactive, only the permanent magnet's field remains. This parameter switching enables the magnetic field to oscillate around zero during measurement while maintaining compact arrangement
3Reliability
If two different magnet systems are installed at an angle to one another, then magnetic field independence is improved, but spatial expansion and measurement accuracy deteriorate
Solution Approach 1:
The patent combines the coil system and permanent magnet system into a single integrated magnet system arranged on the measuring tube. The coil and permanent magnet are positioned to generate magnetic fields that are superimposed in the measuring tube, creating a homogeneous measurement magnetic field without requiring angled installation or additional spatial expansion
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 allows for accurate flow measurement with reduced material costs and complexity, using a single coil and permanent magnet to generate a homogeneous magnetic field, enhancing measurement accuracy and operational efficiency.
Implementation Method 1
A conductive medium flowing through a measuring tube is permeated with a magnetic field, which induces an electrical voltage in the medium
Implementation Method 2
at least one permanent magnet, which is set up to generate a remanent magnetic field, which magnetic field in the measuring tube is oriented essentially transversely to the longitudinal axis of the measuring tube
Implementation Method 3
the coil is set up to set a direction of the remanent magnetic field
Implementation Method 4
the pair of measuring electrodes being set up to tap off the electrical measuring voltage induced by the remanent magnetic field
Data Source
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AI summary
The invention relates to a magneto-inductive flow measuring device for measuring flow velocity or volume flow of a medium in a pipeline as well as to a method for implementing the magneto-inductive flow measuring device. In such case, the remanent magnetic field of at least one permanent magnet is applied for flow monitoring and flow measurement, wherein the flow measurement is performed upon achievement of criteria.