Magnetic Shield Member for Liquid-Level Detection Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing liquid-level detection devices are affected by metallic foreign matter attached to exposed surfaces, leading to reduced accuracy in magnetoelectric conversion device outputs due to magnetic flux leakage.
Innovation Solution
A liquid-level detection device with a magnetic shield member that covers the projection region between magnet parts, preventing magnetic flux leakage by mixing magnetic powder with resin to create a lightweight, effective shield that restricts the magnetic circuit configuration and maintains accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetic shield member entirely covering the projection region is provided to limit leakage of magnetic flux, then accuracy in output of the magnetoelectric conversion device is stabilized, but device complexity increases
Solution Approach 1:
A magnetic shield member is introduced as an intermediary component between the magnet parts and the external environment. This shield member entirely covers the projection region of the space between the magnet parts and limits leakage of magnetic flux outward from the exposed surface, thereby stabilizing the accuracy in output of the magnetoelectric conversion device without requiring complex circuitry or adjustment mechanisms
Solution Approach 2:
The magnetic shield member is positioned to cover only the specific projection region of the space between the magnet parts, rather than covering the entire device. This segmented approach shields only the critical area where magnetic flux leakage affects output accuracy, reducing unnecessary complexity compared to a comprehensive shielding approach
2Weight of moving object
If magnetic powder is mixed with resin to create the magnetic shield member, then device weight is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The magnetic shield member is constructed from a composite material formed by mixing magnetic powder with resin. This composite structure reduces the overall weight of the device compared to solid metal shielding, while the resin matrix provides structural integrity and the magnetic powder provides the necessary magnetic shielding properties
Solution Approach 2:
The magnetic shield member's properties are optimized by controlling the concentration, size distribution, and orientation of magnetic powder particles within the resin matrix. By adjusting these parameters, the shield achieves effective magnetic flux limitation while maintaining lightweight characteristics and manageable manufacturing requirements
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 stabilizes the accuracy of the magnetoelectric conversion device output by inhibiting magnetic flux leakage and allowing reliable detection of liquid levels despite metallic foreign matter attachment, while also reducing device weight.
Implementation Method 1
The rotatable body includes a magnetic shield member entirely covering a projection region of a space located between the pair of magnet parts, which is projected outward in the axial direction, to limit leakage of the magnetic flux
Implementation Method 2
a detecting part that includes a magnetoelectric conversion device disposed in the supporting part and that outputs a detection result according to a density of the magnetic flux passing through the magnetoelectric conversion device
Implementation Method 3
a pair of magnet parts that are held by the rotatable body in an arrangement positioning the supporting part therebetween and that generates a magnetic flux passing through the supporting part
Data Source
AI summary
A liquid-level detection device includes a rotatable body that rotates in accordance with a liquid surface, a fixation body that includes a main body part fixed to a 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 that are held by the rotatable body in an arrangement positioning the supporting part therebetween and that generates a magnetic flux passing through the supporting part, and a detecting part that includes a magnetoelectric conversion device disposed in the supporting part and that outputs a detection result according to a density of the magnetic flux passing through the magnetoelectric conversion device. The rotatable body includes a magnetic shield member entirely covering a projection region of a space located between the pair of magnet parts, which is projected outward in the axial direction, to limit leakage of the magnetic flux. The magnetic shield member is located outward of the supporting part and the pair of magnet parts in the axial direction to include an exposed surface which is exposed into the container.