Electrode Anchor Portion for Uniform Sealing Pressure
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Solution Overview
Problem
Existing measurement apparatuses, such as electromagnetic flowmeters, face challenges in ensuring uniform surface pressure for airtight sealing between electrodes and lining bodies, leading to potential leakage and impaired airtightness, especially when using hard resin or fluororesin linings.
Innovation Solution
The design incorporates an electrode with an anchor portion that contacts a counterbore flat surface on the lining body, ensuring uniform surface pressure and airtightness by forming a semicircular or V-shaped protrusion around the electrode's peripheral edge, which breaks into a corresponding flat surface when the electrode is pulled out, and using a spring and nut to maintain constant pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrode is inserted from inside the measurement pipe to ensure airtightness under pressure, then airtightness is improved, but uniform surface pressure for sealing becomes difficult to achieve
Solution Approach 1:
The electrode head portion is given a curved surface (semicircular or V-shaped protrusion) that contacts the lining body. This curved geometry allows the electrode to conform to the cylindrical inner surface of the measurement pipe, distributing the contact pressure uniformly across the sealing interface when the electrode is pulled outward by the fixing unit.
2Force
If a protruding portion is added to the electrode to concentrate sealing pressure, then sealing force is improved, but uniform pressure distribution deteriorates
Solution Approach 1:
The sealing interface is extended from a single point or line contact to a two-dimensional curved surface contact. The semicircular or V-shaped protrusion creates an arc-shaped sealing surface that distributes the pulling force from the fixing unit across multiple contact points along the curve, achieving both sufficient sealing pressure and uniform pressure distribution.
3Object-affected harmful factors
If hard resin or fluororesin lining is used to prevent corrosion, then corrosion resistance is improved, but airtightness deteriorates due to material hardness
Solution Approach 1:
The curved sealing surface of the electrode head portion allows it to conform to the hard resin or fluororesin lining, distributing the sealing pressure uniformly across the contact area. This prevents stress concentration that would cause leakage, enabling effective sealing even with hard, non-compliant lining materials that resist corrosion.
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 configuration ensures consistent and improved airtightness between the electrode and lining body, maintaining sealing even under varying pressures and material hardness, without adding new components, thus enhancing the retention of airtightness.
Implementation Method 1
a spring and nut to maintain constant pressure
Implementation Method 2
An electromagnetic flowmeter creates a magnetic field inside a measurement pipe by feeding an electric current to a coil. Then, the flow rate of a liquid flowing inside the measurement pipe is measured. Specifically, the flow rate is measured by detecting, by using two electrodes, an electromotive force generated in an orthogonal direction to the magnetic field and being proportional to the flow velocity of the liquid
Data Source
AI summary
A measurement apparatus including a lining body and an electrode. The electrode includes an electrode head portion having a first surface to contact a measurement object and a second surface opposite to the first surface, an electrode anchor portion formed around a peripheral portion of the second surface, and an electrode shaft portion. A protruding portion having a semicircular cross-section and a size smaller than a radius of the electrode shaft portion is formed around a peripheral edge portion of the second surface. A counterbore flat surface portion is formed in the lining body to define an arc portion of the inner surface as a flat surface, and while uniformly coming into contact with the counterbore flat surface portion of the lining body with pressure, the protruding portion of the electrode anchor portion bites into the counterbore flat surface portion.