Liquid Level Detection Device Radial Flow Redirection
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Solution Overview
Problem
Existing liquid level detection devices are prone to foreign matter entering the sliding portions between the magnet holder and the sensor housing, leading to potential locking issues and deterioration of detection accuracy, especially when magnetic materials are involved.
Innovation Solution
The device incorporates an annular protrusion on the sensor housing that redirects liquid flow into a recess on the magnet holder, preventing radial entry of foreign matter and magnetic materials, which are then adsorbed in an accommodating portion with bottomed holes to avoid interfering with the magnetic flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a flat flow path structure is used in the sliding portion, then liquid can flow linearly into the gap, but foreign matter is likely to enter and cause locking
Solution Approach 1:
The invention introduces a protrusion extending in the radial direction from the sliding portion, creating a three-dimensional flow path structure. This radial protrusion forces liquid to flow around it rather than linearly, causing foreign matter to be carried by the liquid flow into the protrusion area where it can be discharged, thus preventing foreign matter accumulation in the sliding portion while maintaining liquid flow capability
Solution Approach 2:
The protrusion acts as an intermediary structure between the liquid flow and the sliding portion. It serves as a intermediate zone where foreign matter can be trapped and discharged before entering the critical sliding portion, mediating the interaction between liquid flow and the sensitive sliding mechanism
2Object-affected harmful factors
If magnetic materials enter the sliding portion, then they may affect the magnetic force, but detection accuracy deteriorates
Solution Approach 1:
The invention converts the potential harmful effect of magnetic materials into a beneficial discharge mechanism. The protrusion structure creates a region where magnetic materials in the liquid are attracted and accumulated, forming a magnetic concentration zone that prevents these materials from reaching the sliding portion. The magnetic force that could have been harmful is thus utilized to trap and remove magnetic contaminants before they can interfere with the detection system
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 design effectively prevents foreign matter from entering the radial sliding portion, preventing locking and maintaining detection accuracy by isolating magnetic materials from the magnetic flux, while also ensuring the device's structural integrity and size efficiency.
Implementation Method 1
a Hall IC provided in the sensor housing and configured to detect a displacement of the magnet
Implementation Method 2
an annular protrusion protruding around the shaft portion from a front surface of the housing body and facing a bottom surface of the holder body; and a recess formed on the bottom surface of the holder body and into which a protruding end of the protrusion is inserted
Data Source
AI summary
A liquid level detection device includes a magnet holder having a magnet housed inside a holder body in which a shaft recess is formed; a sensor housing having a shaft portion protruding from the housing body and rotatably supporting the magnet holder; a float arm whose one end is fixed to a magnet holder and whose another end is attached to a float; a Hall IC provided in the sensor housing and detecting a displacement of the magnet; an annular protrusion protruding around the shaft portion from a front surface of the housing body and facing a bottom surface of the holder body; and a recess formed on the bottom surface of the holder body and into which a protruding end of the protrusion is inserted.