Electromagnetic Flow Meter Electrode Segmentation
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Solution Overview
Problem
Existing electromagnetic flow meters face challenges in coupling the terminal and main body portions of electropotential detection electrodes, particularly when using ceramic as the insulating material, as it restricts the size of the measurement tube and increases costs due to requirements for special sintering and potential damage during brazing.
Innovation Solution
An electropotential detection electrode design that allows the main body portion to be removed from the measurement tube without using the terminal portion, featuring a cylindrical connecting portion with an engaging portion and pulling tool attachment, enabling disconnection via a pulling tool even when the terminal portion is removed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the terminal portion and main body portion are formed separately to improve strength and reduce manufacturing difficulty, then the coupling structure becomes complex and requires additional components
Solution Approach 1:
The coupling structure integrates the terminal portion and main body portion through a unified design where the terminal portion is directly coupled to the measurement tube via the main body portion. This merging eliminates the need for separate coupling components while maintaining the strength benefits of separate formation, thereby reducing device complexity without sacrificing structural integrity.
2Ease of manufacture
If press-fitting is used to couple the terminal portion to the main body portion, then manufacturing is simplified, but the brittle ceramic base material may breakage
Solution Approach 1:
The coupling structure incorporates a cushioning mechanism that distributes the pressing force during assembly. The terminal portion is designed with features that gradually engage with the main body portion, preventing sudden stress concentration on the brittle ceramic base material. This beforehand cushioning allows press-fitting to be used safely without risking breakage of the ceramic component.
3Ease of manufacture
If adhesion is used to couple the terminal portion to the main body portion, then manufacturing is simplified, but electric conduction cannot be achieved
Solution Approach 1:
The coupling structure employs composite material principles by combining adhesive bonding with conductive elements. The adhesive provides the mechanical coupling and sealing, while integrated conductive pathways (such as conductive coatings or embedded conductive features) ensure electric conduction between the terminal portion and main body portion. This composite approach achieves both ease of manufacture and electrical functionality.
4Ease of operation
If the electropotential detection electrode is designed with a terminal portion for gripping, then attachment and removal is facilitated, but the measurement tube size is restricted and costs increase
Solution Approach 1:
The electropotential detection electrode is segmented into distinct functional portions: a terminal portion for gripping and manipulation, a main body portion for measurement, and a measurement tube interface portion. This segmentation allows the gripping features to be concentrated in the terminal portion without interfering with the dimensional compatibility requirements of the measurement tube interface, thereby maintaining adaptability across different measurement tube sizes while facilitating ease of operation.
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 eliminates the need for a terminal portion during removal, reduces material costs, and provides flexibility in selecting materials for the connecting portion, while maintaining electrical conductivity and sealing integrity.
Implementation Method 1
electromagnetic flow meter, which is configured to extract an electromotive force generated in a fluid flowing in a measurement tube
Data Source
AI summary
A main body portion including at one end thereof a liquid-contact portion exposed into a measurement tube and being electrically conductive from the one end to the other end is provided. A terminal portion including a disc shaped portion (contact portion) that is separably in contact with the other end of the main body portion is provided. A connecting portion configured to connect a pulling tool to the main body portion is provided.