Float Level Sensor Projections Prevent Viscous Build-up
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Solution Overview
Problem
Float level sensors often malfunction when submerged in tacky or viscous liquids due to build-up of substances that prevent relative movement between the float and the alignment shaft, leading to inaccurate liquid level detection.
Innovation Solution
A floating mechanical level sensor with a shaped float assembly featuring projections that establish point contacts with the float guide, minimizing contact area and preventing build-up, allowing for free movement and reliable operation in viscous liquids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a float with circular hole moves on a shaft with substantially circular cross-section, then the float level sensor can indicate liquid levels, but build-up of substances occurs at the contact area between the float and shaft, preventing relative movement
Solution Approach 1:
The float is segmented with multiple radially spaced projections on its inner surface, dividing the contact interface into multiple discrete point contacts. This segmentation prevents continuous surface contact that leads to substance build-up, while maintaining sufficient support for reliable float movement.
Solution Approach 2:
The projections on the float inner surface and corresponding projections on the shaft create point contact geometry rather than continuous surface contact. This curved/point-based contact geometry reduces the area where substances can accumulate, preventing obstruction of float movement.
2Adaptability or versatility
If multiple floats move up and down at different positions on a shaft, then different level ranges can be determined, but the contact area between floats and shaft increases, increasing susceptibility to malfunction in viscous liquids
Solution Approach 1:
Each float is segmented with multiple radially spaced projections, creating multiple discrete point contacts with the shaft. This segmentation allows multiple floats to operate simultaneously at different levels while each maintains minimal contact area with the shaft, preventing substance build-up even with multiple contact points across multiple floats.
Solution Approach 2:
The contact interface transitions from a two-dimensional surface contact to a series of zero-dimensional point contacts through the projections. This dimensional reduction allows multiple floats to contact the shaft at discrete points without creating continuous surfaces where substances can accumulate.
3Measurement precision
If a single float is provided with vertical linear movement, then a specific level range can be monitored, but the float may become obstructed by flocculating substances in viscous liquids
Solution Approach 1:
The projections create point contact geometry that eliminates continuous surface contact between the float and shaft. This point-based contact prevents flocculating substances from accumulating in a continuous layer, maintaining float mobility and level detection accuracy in viscous liquids.
Solution Approach 2:
The design accepts that substances will be present in the liquid environment but converts this potentially harmful condition into a non-problematic situation by using point contacts that prevent substance accumulation. The projections allow substances to pass through or around the contact points without obstructing float movement.
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 effectively reduces the likelihood of sensor failure by enabling the float to move freely and actuate the level sensor properly, even in the presence of flocculating substances, ensuring accurate liquid level detection and minimizing the risk of obstruction.
Implementation Method 1
a float with a circular hole in the center... a buoyancy device and the alignment shaft
Data Source
AI summary
Devices and methods for a vertical float system. A float guide, located in a tank containing a fluid, has first and second sections with a first diameter and a third section between the first and second section. The third section has a smaller, second diameter. A float is slidably attached to the float guide in the third section. The system includes a switch and a level sensor located in the first section or the second section. The switch becomes activated when the float contacts the level sensor. One of an inner face of the float and the third section of the float guide has projections arranged in a contiguous pattern around the one of the inner face of the float and the third section of said float guide. The projections are shaped to establish point contacts between the float and the float guide in the third section.