Magnetization Device for Nuclear Magnetic Flow Meters
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Solution Overview
Problem
Current nuclear magnetic flow meters face challenges in achieving homogeneous magnetic fields within measurement tubes, leading to reduced measurement accuracy and high production and time expenditures due to the complex arrangement and shimming of bar magnets.
Innovation Solution
The magnetization device employs hollow profiles for permanent magnets, allowing for easy alignment and reduced friction, with a carrier system that simplifies the arrangement of magnets, reducing production and time costs, and includes features like PTFE coating and rotatable receiving tubes to enhance magnetic field homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bar magnets are arranged in disks and held between rings with screws, then the magnetic field can be generated, but the production expenditure and time required increase significantly due to the complex arrangement and shimming process
Solution Approach 1:
The magnetization device is divided into multiple magnet disks, each containing several bar magnets arranged in specific patterns (e.g., Halbach arrays). This segmentation allows for modular assembly and simplifies the overall manufacturing process while maintaining field homogeneity through careful design of each segment.
Solution Approach 2:
The bar magnets are pre-arranged in specific configurations within each magnet disk before assembly. The magnets are positioned in predetermined patterns (such as alternating polarities or Halbach arrays) during the manufacturing stage, eliminating the need for complex shimming operations during installation and reducing both production time and expenditure.
2Power
If multiple bar magnets are tightly arranged in magnet disks, then the magnetic field strength increases, but the expenditure of force for introducing magnets into receivers increases
Solution Approach 1:
A receiving tube with a through-opening is introduced as an intermediary component between the bar magnets and the final assembly position. The magnets are inserted into the receiving tube first, where they can be guided and positioned with minimal force, and then the entire receiving tube with embedded magnets is installed as a unit, significantly reducing the force required compared to inserting individual magnets directly into their final positions.
3Measurement precision
If the magnetic field is made homogeneous by manipulation of bar magnets (shimming), then measurement accuracy improves, but production time and costs increase
Solution Approach 1:
The magnetic field homogeneity is achieved through preliminary design and arrangement of the bar magnets in specific patterns during manufacturing, rather than through time-consuming shimming operations after assembly. The magnets are positioned in predetermined configurations (such as alternating polarities or Halbach arrays) that inherently produce homogeneous fields, eliminating the need for iterative adjustment and significantly reducing production time.
Solution Approach 2:
The invention changes the arrangement parameters of the bar magnets, transitioning from random or simple linear arrangements to optimized patterns such as Halbach arrays or alternating polarity configurations. This parameter change in the magnetic field generation approach achieves homogeneity through design rather than adjustment, improving measurement precision while reducing production time.
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 solution significantly reduces production and time expenditures while achieving sufficient magnetic field homogeneity, enhancing measurement accuracy and making nuclear magnetic flow meters more economical and efficient for multiphase fluid analysis.
Implementation Method 1
a plurality of permanent magnets for generation of a magnetic field
Implementation Method 2
The friction in the movement of the permanent magnets in the hollow profiles is reduced by lining of the hollow profiles, for example, with a polytetrafluoroethylene (PTFE) coating
Data Source
AI summary
A magnetization device for permeation of a multiphase fluid flowing through a measurement tube of a nuclear magnetic flow meter with a magnetic field which is homogenous at least in one plane, with a plurality of permanent magnets for generation of a magnetic field and with a carrier, the carrier having at least one magnet receiver, each magnet receiver accommodating at least one of the permanent magnets, the shape of the magnet receivers and of the permanent magnets allowing movement of the permanent magnets in the magnet receivers only in one direction and the permanent magnets being by the magnet receivers formed by hollow profiles. The hollow profile magnet receivers can be receiving tubes for the magnets that can be turned around their longitudinal axis or the profiles can have a rotatable adapter for the magnets so that a first shimming action can be achieved with the profiles.