Magneto-Inductive Flow Meter Collar Cold Deformation
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Solution Overview
Problem
Existing magneto-inductive flow measuring devices face challenges in accurately measuring fluid flow due to dependence on flow profile, which is influenced by factors like Reynolds number, tube geometry, and fluid properties, leading to measurement deviations and potential cavitation issues, especially at high flow velocities.
Innovation Solution
A method involving the use of metal collars and an electrically non-conductive, elastic liner to reduce the cross-sectional area of the measuring tube through cold deformation, allowing for targeted geometry changes without damaging the liner and enabling precise installation, with collars providing stabilization and housing support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external forces are applied to reduce the cross-sectional area of the measuring tube, then the measuring performance and sensitivity are improved, but the method lacks detail on how forces are controlled and how to prevent liner damage
Solution Approach 1:
Collars are introduced as intermediary components to apply controlled compressive forces during cold deformation. The collars act as mediators between the deformation mechanism and the measuring tube, distributing forces evenly and preventing liner damage while achieving the desired cross-sectional reduction for improved measurement performance
Solution Approach 2:
The liner is installed in the measuring tube before the cold deformation process begins. This preliminary action protects the liner from direct exposure to uncontrolled external forces during deformation, and the collars are positioned in advance to ensure proper force distribution during the subsequent cross-sectional reduction
2Measurement precision
If the cross sectional area of the measuring tube is reduced to improve flow profile and measurement accuracy, then the measuring sensitivity increases, but the liner installation becomes significantly more complicated
Solution Approach 1:
The liner is installed in the measuring tube before the cold deformation process reduces the cross-sectional area. By performing this action preliminarily, the liner is positioned in the easier-to-install uniform cross-section configuration, avoiding the complexity of installing a liner in a already-deformed irregular cross-section
Solution Approach 2:
The cross-sectional area parameter of the measuring tube is changed after liner installation through cold deformation. This sequence allows the liner to be installed when the tube has a larger, more accessible cross-section, then the parameters are modified to achieve the desired measurement performance without compromising liner installation ease
3Ease of manufacture
If hydroforming method is used to reduce cross sectional area, then the forming is achieved, but the liner can only be installed following the forming which is significantly more complicated
Solution Approach 1:
The liner installation is performed as a preliminary action before the hydroforming or cold deformation process. This reverses the conventional sequence where forming precedes liner installation, thereby avoiding the complexity of installing liners in already-formed irregular cross-sections
Solution Approach 2:
The conventional sequence of operations is inverted: instead of forming the measuring tube first and then installing the liner, the liner is installed first in the uniform cross-section tube, and then the cross-sectional reduction is achieved through cold deformation with collars. This inversion resolves the installation complexity issue
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 method enhances measurement accuracy and sensitivity by altering the flow profile, reduces material costs, and simplifies liner installation, while maintaining material strength and avoiding scaling issues, achieving improved measuring performance with reduced cross-sectional area.
Implementation Method 1
altering a measuring section of the measuring tube located at least partially between the first and second collars by means of cold deformation in such a manner that the cross sectional area of the measuring section is reduced
Implementation Method 2
lining the measuring tube internally with an electrically non-conductive, elastic liner
Data Source
AI summary
A method for manufacturing an apparatus for measuring flow of a fluid flowing through a measuring tube of metal using the magneto-inductive principle, comprising the method steps as follows: securing first and second collars of metal externally on the measuring tube with an orientation perpendicular to the tube axis of the measuring tube; lining the measuring tube internally with an electrically non-conductive, elastic liner; and altering a measuring section of the measuring tube located at least partially between the first collar and the second collar by means of cold deformation in such a manner that the cross sectional area of the measuring section is reduced compared with the cross sectional area of an inflow section of the measuring tube located upstream from the measuring section and an outflow section of the measuring tube located downstream from the measuring section.