Liquid-Level Detection Device with Curved Exposed Surface
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Solution Overview
Problem
Conventional liquid-level detection devices suffer from decreased detection accuracy due to the attachment of magnetic foreign substances, which form a magnetic circuit that weakens the magnetic flux passing through the Hall IC, leading to secular changes in detection results over long-term use.
Innovation Solution
A liquid-level detection device design featuring a rotatable body with an exposed surface that includes an erected wall between projection regions, positioned to avoid easy magnetic attachment of foreign substances, thereby preventing the formation of a magnetic circuit and maintaining stable magnetic flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the magnet holder has a flat exposed surface that projects into the container, then the magnetic force is easily applied to the surface for effective detection, but magnetic foreign substances are gradually attached to the surface causing deterioration in detection accuracy
Solution Approach 1:
The patent applies curvature by replacing the flat exposed surface with a curved surface having a predetermined radius of curvature. This curved surface prevents magnetic foreign substances from being easily attached compared to flat surfaces, while still allowing effective magnetic force application for detection purposes.
Solution Approach 2:
The patent applies local quality by creating different surface characteristics in different regions. The curved exposed surface has different properties (resistance to magnetic foreign substance attachment) compared to other surfaces, optimizing each region for its specific function while preventing the harmful accumulation of magnetic particles.
2Quantity of substance
If magnetic foreign substances attach to the exposed surface, then a magnetic circuit is formed between projection regions, but this causes leakage of magnetic flux and weakens the flux passing through the Hall IC
Solution Approach 1:
The curved surface design prevents the formation of continuous magnetic circuits by magnetic foreign substances, thereby reducing magnetic flux leakage and maintaining stable magnetic flux density through the Hall IC for accurate detection.
Solution Approach 2:
The patent changes the surface geometry parameter from flat to curved with a specific radius of curvature, which fundamentally alters how magnetic foreign substances interact with the magnetic field, preventing circuit formation and maintaining flux stability.
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 device maintains high detection accuracy over a long period by preventing the attachment of magnetic foreign substances and stabilizing the magnetic flux, ensuring reliable and precise liquid surface level detection.
Implementation Method 1
a housing that rotatably supports the magnet holder by a supporting shaft in which a Hall IC is embedded... the density of magnetic flux passing through the Hall IC changes according to the rotation of the magnet holder
Implementation Method 2
a pair of magnet parts that are held by the rotatable body at arrangement positions with the rotation axis therebetween to generate a magnetic flux passing through the supporting part
Data Source
AI summary
A liquid-level detection device for detecting a level of a liquid surface of liquid stored in a container, includes a rotatable body that rotates in accordance with the liquid surface, a fixation body having a main body part fixed to the container and a supporting part projecting from the main body part in an axial direction along a rotation axis of the rotatable body to rotatably support the rotatable body, a pair of magnet parts held by the rotatable body at arrangement positions with the rotation axis therebetween to generate a magnetic flux passing through the supporting part, and a detecting part having an element part disposed inside the supporting part to output a detection result according to a density of a magnetic flux passing through the element part. The rotatable body includes an exposed surface that is located outward of the supporting part and the pair of magnet parts in the axial direction and that is exposed into the container. An erected wall rising up from the exposed surface outward in the axial direction is provided between two projection regions which are obtained by projecting the pair of magnet parts onto the exposed surface outward in the axial direction.