Oil level detection system for deep fat fryer
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Solution Overview
Problem
Conventional level detectors in commercial deep fat fryers require manual monitoring and frequent refilling due to continuous oil loss during cooking, leading to inefficiencies and potential oil level inconsistencies.
Innovation Solution
A liquid level detection system incorporating a heat producing element and temperature sensor within a shell, which automatically monitors the oil level by measuring the surface temperature of the heat producing element and determining the presence of oil based on the rate of change of this temperature after the element is deenergized, triggering alarms or automated refilling when the level falls below a set point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If conventional level detectors are used in deep fat fryers, then the structure is simple, but manual monitoring is required and oil level consistency deteriorates
Solution Approach 1:
The patent replaces conventional mechanical float-based level detectors with an electrical/thermal detection system. The system uses a heat producing element and temperature sensor to detect oil level through thermal conductivity differences, eliminating the need for mechanical moving parts and manual monitoring while maintaining detection functionality.
Solution Approach 2:
The patent introduces a shell as an intermediary component that houses the heat producing element and temperature sensor. This shell acts as a protective barrier and thermal interface, allowing the detection system to function reliably in the harsh fryer environment while protecting the sensitive electronic components.
2Productivity
If manual monitoring of oil level is performed, then the device complexity is low, but productivity decreases due to frequent refilling
Solution Approach 1:
The patent implements a feedback control system where the temperature sensor continuously monitors the thermal state of the heat producing element and sends signals to the controller. When oil level drops below the detection point, the system automatically triggers an alarm or refilling mechanism, eliminating the need for manual monitoring and enabling continuous operation.
Solution Approach 2:
The detection system enables the fryer to monitor and manage its own oil level automatically. The controller receives temperature signals and autonomously determines when refilling is needed, allowing the system to self-regulate without human intervention and maintain optimal cooking conditions continuously.
3Measurement precision
If conventional float detectors are used, then the device complexity is low, but measurement precision of oil level is insufficient
Solution Approach 1:
The patent changes the detection parameter from mechanical position (float height) to thermal conductivity (temperature difference). By measuring the rate of temperature change of the heat producing element, the system achieves more precise and continuous oil level detection, as thermal changes provide more sensitive and accurate level information compared to mechanical float position.
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 system provides automatic and accurate monitoring of oil levels, reducing manual intervention and ensuring consistent oil levels in deep fat fryers, applicable to various heated liquid containers.
Implementation Method 1
The heat producing element is configured to transfer heat generated therein to the shell
Implementation Method 2
a temperature sensor disposed proximate to the heat producing element and configured to provide a first output signal representative of a surface temperature of the heat producing element
Implementation Method 3
determines the presence or absence of liquid proximate to the liquid level detector based upon the comparison between the measured rate of change of the first output signal and the reference value range
Data Source
AI summary
A detector configured to indirectly monitor a level of liquid within a container is provided. The detector includes a temperature sensor and a heat producing element proximate to the temperature sensor. A shell is disposed around the temperature sensor and heat producing element, the shell is configured to be disposed within a container and to provide a barrier between liquid disposed within the container and each of the temperature sensor and heat producing element. The heat producing element is configured to transfer heat generated therein to the shell, and the sensor is configured to measure a surface temperature of the heat producing element.