Cooking Oil Pumping Station with Capacitance-Based Quality Sensing
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Solution Overview
Problem
Commercial fryers face inefficiencies due to degraded cooking oil, which is difficult to assess accurately for suitability in cooking operations, leading to a need for reliable methods to measure oil quality and efficiently dispose of spent oil.
Innovation Solution
A system that includes a pump, oil quality sensors, and a controller to measure and direct the flow of cooking oil from a fryer vat to a storage receptacle or external pumping station, based on the oil's quality, using sensors to detect TPMs and other properties to determine if the oil is suitable for reuse or disposal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If simple means of testing oil quality (color, smell, taste) are used, then the testing process is simple and quick, but the results are unpredictable and unreliable
Solution Approach 1:
The patent replaces subjective sensory evaluation (color, smell, taste) with objective electronic measurement systems. Specifically, it uses capacitance sensors to measure total polar materials (TPMs) and light sensors to monitor illuminance and polarity, transforming qualitative sensory assessments into quantitative electrical and optical measurements that provide reliable, repeatable data.
Solution Approach 2:
The patent introduces intermediate measurement parameters (capacitance, illuminance, polarity) that serve as mediators between the oil's physical state and its quality assessment. These intermediate measurements capture intrinsic properties of the oil (TPMs, free fatty acids) that correlate with degradation, providing a reliable bridge between simple measurement and accurate quality determination.
2Reliability
If more reliable means of evaluation (smoke point, viscosity testing) are used, then the reliability of results improves, but the time effectiveness and simplicity decrease
Solution Approach 1:
The patent replaces time-consuming mechanical testing procedures (smoke point determination, viscosity measurement) with instantaneous electronic sensing. Capacitance sensors measure TPMs and light sensors measure polarity in real-time as oil flows through the system, eliminating the need for separate laboratory-style testing procedures that require significant time and equipment setup.
Solution Approach 2:
The patent implements continuous online monitoring of oil quality parameters as oil circulates through the frying system. Rather than periodic batch testing, the sensors continuously measure capacitance, illuminance, and polarity, providing ongoing quality assessment without interrupting cooking operations, thus eliminating time loss associated with stopping production for quality checks.
3Measurement precision
If oil quality sensors are positioned throughout the circulation loop, then the accuracy of oil quality assessment improves, but the device complexity increases
Solution Approach 1:
The patent segments the oil quality measurement function across multiple sensor types (capacitance sensors for TPMs, light sensors for polarity and illuminance) positioned at different locations in the circulation loop. Each sensor type targets specific degradation parameters, and their combined measurements provide comprehensive quality assessment. This segmentation allows accurate measurement of different aspects of oil degradation without requiring a single complex measurement system.
Solution Approach 2:
The patent employs multi-functional sensors that perform multiple measurement tasks. For example, light sensors measure both illuminance and polarity, and capacitance sensors measure TPMs. This multi-functionality reduces the total number of separate measurement devices needed while maintaining comprehensive monitoring capability, thereby limiting the increase in device complexity despite enhanced measurement precision.
4Productivity
If a pumping station is used to transport oil externally, then the ability to quickly remove and dispose of spent oil improves, but the device complexity and cost increase
Solution Approach 1:
The patent implements a self-regulating oil management system where quality sensor measurements automatically control pump operation and flow direction through feedback control. When oil quality degrades beyond thresholds, the controller automatically activates the pump to remove oil and directs flow accordingly, eliminating the need for manual monitoring and intervention. This self-service capability justifies the pumping system complexity by providing automated, rapid response to quality changes.
Solution Approach 2:
The patent incorporates feedback control loops where sensor measurements of oil quality (TPMs, polarity, illuminance) continuously inform pump operation and flow valve positioning. The controller uses this feedback to automatically adjust pumping rates and redirect oil flow between the fryer, storage receptacle, and disposal pathways, enabling rapid removal of degraded oil based on real-time quality data while minimizing unnecessary pump operation.
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
Enables quick and accurate assessment of oil quality, allowing for strategic management of oil circulation and efficient disposal of spent oil, optimizing oil usage and reducing operational inefficiencies.
Implementation Method 1
One particularly useful means of measuring oil quality degradation is to measure the approximate capacitance of the oil, specifically measured by the impurities generated during operation of the fryer. This measurement is referred to as the total polar materials, or TPMs, present in the oil.
Implementation Method 2
For example, a light sensor may be used to monitor the illuminance of the oil or a measure of the polarity of the oil to determine the amount of free fatty acids present.
Data Source
AI summary
A system for transporting and measuring the quality of cooking oil in a system. The system may include a fryer unit, a feed tank, a storage receptacle, and either a pumping station, direct flow pathway from the fryer unit to the storage receptacle, or both a pumping station and a direct flow pathway from the fryer unit to the storage receptacle. At least one oil quality sensor for measuring the quality of the oil, such as by measuring the electrical properties of the oil, may be placed in one of the various lines of the pumping station, in the direct flow pathway from the fryer unit to the storage receptacle, or any combination thereof.