Pot Cover Capacitive Detection for Timely Overflow Prevention
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Solution Overview
Problem
Existing cooking utensils, such as electric rice cookers, rely on costly and insensitive electrical resistance-based spill-proof detection methods, which are not effective in timely detection of overflow.
Innovation Solution
A capacitive detection device integrated into the pot cover assembly, utilizing a capacitance value change to detect contact states between a medium and the detection surface, reducing costs and improving sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical resistance-based detection is used, then spill-proof detection can be realized, but the cost is high and sensitivity is poor
Solution Approach 1:
The patent replaces the electrical resistance-based detection system with a capacitive detection system. The capacitive sensor detects changes in capacitance caused by liquid contact, providing higher sensitivity and lower cost while maintaining reliable spill-proof detection functionality.
Solution Approach 2:
The patent changes the detection parameter from electrical resistance to capacitance. By measuring capacitance changes rather than resistance changes, the system achieves improved sensitivity and more reliable detection of liquid overflow conditions.
2Reliability
If two probes are used for resistance detection, then detection function is achieved, but cost increases
Solution Approach 1:
The patent extracts the detection function from a multi-probe resistance detection system and implements it using a single capacitive sensor. This reduces the number of components while maintaining the essential detection capability.
Solution Approach 2:
The capacitive sensor serves multiple functions: it detects liquid contact, determines overflow conditions, and provides reliable spill-proof detection all through a single component, replacing the need for multiple specialized probes.
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 capacitive detection device provides timely and reliable spill-proof detection, reducing the likelihood of false judgments and enhancing the accuracy of overflow detection, thereby ensuring the pot cover assembly's low cost and high reliability.
Implementation Method 1
a capacitance value of the spill-proof detection device changes with change of a contact state between a medium and the detection surface
Data Source
AI summary
The pot cover assembly includes a pot cover body and a spill-proof detection device. The spill-proof detection device is a capacitive detection device and it is provided on the pot cover body. At least a lower surface of the spill-proof detection device forms a detection plane and a capacitance value of the spill-proof detection device is changed as a function of a contact medium of the detection plane.