Electromagnetic Flow Meter Electrode Groove Design
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Solution Overview
Problem
Electromagnetic flow meters with precious metal-covered electrodes face issues of noise generation due to peeling off of the precious metal material, leading to reduced reliability in conduction, especially when abrasive substances are present or the measurement tube is subjected to impact, causing contract stress and thickness reduction at corners.
Innovation Solution
An electropotential detection electrode with a ceramic base material covered by a conductive material, featuring an annular groove with cutaways extending to the outer peripheral surface, ensuring that even if the conductor peels off, the conduction state remains unaffected and reliability is enhanced by eliminating corners that impair conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a precious metal material is used to cover the electrode to achieve high corrosive resistance, then the electrode can withstand corrosion, but the precious metal material may be peeled off due to low strength and contract stress, generating electrochemical noise
Solution Approach 1:
The patent divides the electrode structure into distinct functional zones: a precious metal material layer for corrosion resistance and a base metal layer for mechanical strength. This segmentation allows each material to perform its optimal function without compromising the other, preventing peeling while maintaining corrosive resistance.
Solution Approach 2:
The patent employs a composite electrode structure combining precious metal material and base metal material in a layered configuration. This composite approach leverages the advantages of both materials - the corrosion resistance of precious metal and the mechanical strength of base metal - to eliminate peeling issues while maintaining electrical conductivity.
2Strength
If the measurement tube is subjected to impact or corrosion, then the tube may deteriorate, but this causes peeling off of the precious metal material covering the electrode
Solution Approach 1:
The patent applies a base metal layer beneath the precious metal material layer in advance, creating a protective foundation that prevents peeling before it can occur. This preliminary structural reinforcement ensures that even when the measurement tube experiences impact or corrosion, the electrode coating remains intact and electrically conductive.
3Ease of manufacture
If an annular groove is formed in the electrode structure, then the groove may store gasket material, but the corners of the groove experience thickness reduction and contract stress causing peeling
Solution Approach 1:
The patent applies different material properties to different regions of the electrode - the precious metal material is selectively applied to areas requiring corrosion resistance while the base metal provides structural support in high-stress corner regions. This local differentiation ensures that corners with thickness reduction do not peel, maintaining conduction reliability while preserving the annular groove's gasket storage function.
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 provides high reliability in conduction for the electropotential detection electrode, maintaining conductivity integrity despite potential peeling of the conductor, thereby improving the overall performance of the electromagnetic flow meter.
Implementation Method 1
electromagnetic flow meters of the related art are configured to extract an electromotive force generated in a fluid flowing in a measurement tube
Data Source
AI summary
A liquid-contact portion exposed into a measurement tube is provided, and a main body portion formed by covering a base material with a conductor is provided. A terminal portion electrically connected to the conductor is provided. The main body portion includes a small diameter portion having a cylindrical shape and being inserted at one end thereof into an electrode insertion hole of the measurement tube, and the one end corresponds to the liquid-contact portion; and a large diameter portion having a disc shape extending outward from the other end of the small diameter portion in a radial direction. The large diameter portion includes an annular groove opened toward inside a measurement, tube, and cutaway's extending outward from the annular groove in the radial direction and opening to an outer peripheral surface of the large diameter portion.