Liquid Level Detector Clearance Design for Foreign Substance Protection
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Solution Overview
Problem
Existing liquid level detectors face issues with fine foreign substances accumulating around the revolving shaft, causing the arm to malfunction due to clogged clearances, which complicates the route from the outside to the revolving shaft.
Innovation Solution
A liquid level detector design featuring a rotator with a resin body, a magnet, and a magnetic sensor, where the clearance between the supporter and the magnet is larger than other clearances, preventing large foreign substances from reaching the magnet and utilizing a sliding opposing wall as a bearing to generate a moment for rotation, even with foreign substances caught in other clearances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the route from outside to the revolving shaft is complicated with steps and projecting portions, then metal powders are prevented from reaching the revolving shaft, but fine foreign substances can still reach and accumulate around the revolving shaft causing clearance clogging
Solution Approach 1:
The patent divides the protective structure into multiple segments: the body with its step portion, the holder with projecting portions, the cover with its projecting portions, and the opposing wall. Each segment creates a separate barrier that collectively prevents foreign substances from reaching the revolving shaft, addressing the limitation of previous single-structure approaches
Solution Approach 2:
The patent introduces the cover as an intermediary component between the outer environment and the revolving shaft. The cover with its projecting portions creates an additional barrier that intercepts foreign substances before they can reach the holder and revolving shaft, enhancing the protective function
2Object-affected harmful factors
If the clearance between the supporter and magnet is made smaller to prevent foreign substance entry, then foreign substances are blocked, but the arm cannot rotate due to friction and moment requirements
Solution Approach 1:
The patent applies different clearance sizes at different locations: the clearance between the cover and holder is small to block foreign substances, while the clearance between the holder and revolving shaft is larger to allow rotation. This local differentiation of clearance quality enables both protection and operation
Solution Approach 2:
The patent moves the bearing function from the rotation center (revolving shaft) to the outer circumference (opposing wall). This dimensional relocation allows the arm to rotate about the revolving shaft while the opposing wall provides bearing support at a distance, generating sufficient moment to overcome friction in the blocked clearances
3Volume of moving object
If the opposing wall is positioned closer to the rotation center to reduce size, then the magnet can be smaller, but insufficient moment is generated to rotate the arm against foreign substance friction
Solution Approach 1:
The patent relocates the bearing function from the rotation center to the outer circumference by positioning the opposing wall at a distance from the revolving shaft. This dimensional change increases the moment arm length, generating sufficient rotation moment to overcome friction caused by foreign substances in the blocked clearances
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 effectively prevents foreign substances from interfering with the arm's rotation, ensuring reliable operation by storing foreign substances or adsorbing them with the magnet, thus maintaining the detector's functionality.
Implementation Method 1
a magnet fixed to the rotator; a magnetic sensor covered by the supporter and configured to output a signal corresponding to a rotation of the magnet opposing the magnetic sensor via the supporter
Implementation Method 2
the opposing wall and the outer circumference wall are opposed to each other on an outer circumference side of the magnet. According to this configuration, the opposing wall, which functions as the bearing, may be disposed at a position distant from the rotation center of the rotator... a relatively large moment may be generated at the opposing wall
Data Source
AI summary
A liquid level detector may include a rotator fixed to an arm, a magnet fixed to the rotator, and a supporter rotatably supporting the rotator. The supporter may include a body, and an outer circumference wall disposed along a rotation direction of the arm on an outer circumference side of the magnet. The rotator may include a cover covering an end part of the outer circumference wall, and an opposing wall opposing at least one of an inner circumference surface and an outer circumference surface of the outer circumference wall. A first clearance between the supporter and the magnet may communicate with an outer space via a second clearance between the outer circumference wall and the cover and a third clearance between the outer circumference wall and the opposing wall. The first clearance may be larger than at least one of the second clearance and the third clearance.