Liquid Level Measurement Circuit for Viscous Media

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Solution Overview

Problem

Existing liquid level measurement technologies, such as those using buoys and photoelectric switches, suffer from inaccuracies when measuring viscous liquids due to buoy sticking issues, leading to incorrect liquid level detection.

Innovation Solution

A liquid level measurement circuit comprising a probe with spaced-apart positive and negative electrode conductors and a potential conversion module that outputs different electrical signals based on immersion status, allowing for accurate liquid level determination without sticking, and includes a vacuum pump system for automatic liquid supplementation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a buoy and photoelectric switch are used for liquid level measurement, then the measurement structure is simple, but the measurement precision deteriorates when the liquid is viscous due to buoy sticking

Engineering Contradiction:
Improvemeasurement structure complexityVSAvoidliquid level measurement accuracy
Core Design Contradiction:
Device complexityVSMeasurement precision

Solution Approach 1:

The patent replaces the mechanical buoy system with an electrical probe system. Instead of using a mechanical buoy that physically moves with the liquid level and can stick to viscous liquids, the invention uses a probe with electrodes that detect liquid level through electrical conductivity changes. This substitution eliminates mechanical contact with viscous liquids, thereby maintaining measurement precision without increasing structural complexity.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces the measurement liquid itself as an intermediary medium for detection. The conductive measurement liquid serves as the mediator between the probe electrodes and the detection system. By using the liquid's inherent electrical conductivity properties as the detection mechanism, the system avoids direct mechanical interaction that causes sticking, thus resolving the contradiction between simple structure and accurate measurement.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Device complexity

If a buoy is used in viscous liquid, then the measurement structure is simple, but the reliability deteriorates due to sticking between buoy and liquid

Engineering Contradiction:
Improvemeasurement structure complexityVSAvoidliquid level measurement reliability
Core Design Contradiction:
Device complexityVSReliability

Solution Approach 1:

The patent replaces the mechanical buoy system with an electrical probe system. Instead of using a mechanical buoy that physically moves with the liquid level and can stick to viscous liquids, the invention uses a probe with electrodes that detect liquid level through electrical conductivity changes. This substitution eliminates mechanical contact with viscous liquids, thereby maintaining measurement precision without increasing structural complexity.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

3Device complexity

If manual liquid level monitoring is used, then the device complexity is low, but the productivity deteriorates due to incorrect liquid level detection

Engineering Contradiction:
Improvemonitoring system complexityVSAvoidoperation efficiency
Core Design Contradiction:
Device complexityVSProductivity

Solution Approach 1:

The patent implements an automatic monitoring and alert system that self-monitors liquid levels and automatically generates alerts when the liquid level is low. The system includes a probe that continuously monitors, a control unit that processes the signals, and an alert mechanism that notifies operators. This automated self-service monitoring eliminates manual checking, ensures accurate detection, and improves operational efficiency without requiring complex manual intervention procedures.

Inventive Principle:
Principle #25Self-service

Solution Approach 2:

The patent implements a feedback mechanism where the probe continuously monitors liquid level and provides real-time feedback to the control unit. When the liquid level drops below a threshold, the system generates an alert signal. This closed-loop feedback system ensures timely detection and response, improving productivity by preventing operational errors due to incorrect liquid level detection.

Inventive Principle:
Principle #23Feedback

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 provides accurate liquid level measurement for viscous liquids by preventing sticking and enabling automatic liquid replenishment, thus ensuring reliable operation and preventing printing errors in 3D printing applications.

Implementation Method 1

the positive electrode conductor is electrically connected to the negative electrode conductor by means of the measurement liquid, such that an electrical signal at the second end of the potential conversion module has a larger value than the reference electrical signal

Methodology Applied
Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS12092505B2Liquid level measurement circuit, apparatus and method
Publication Date: 2024.09.17 SHENZHEN ANYCUBIC TECH CO LTD
  • US12092505B2 patent drawing
  • US12092505B2 patent drawing
  • US12092505B2 patent drawing

AI summary

A liquid level measurement circuit includes: a probe, a reference electrical signal module and a potential conversion module, where the probe extends into a liquid level accommodation body, and the liquid level accommodation body accommodates a measurement liquid module. If the liquid level of said liquid is lower than a preset liquid level, a positive electrode conductor and/or a negative electrode conductor are/is not immersed in the measurement liquid, and an output end of the potential conversion module outputs a first electrical signal; and if the liquid level of the measurement liquid is not lower than the preset liquid level, the positive electrode conductor and the negative electrode conductor are immersed in the measurement liquid, and the output end of the potential conversion module outputs a second electrical signal. The accuracy of liquid level measurement can be improved.