Dielectric Heating Resonance for Uniform Liquid Drying
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Solution Overview
Problem
Existing dielectric heating devices require sensors to measure moisture content for controlling high-frequency electric fields, which increases complexity and cost.
Innovation Solution
A dielectric heating device with heaters having electrodes and coils, configured to operate at specific resonant frequencies relative to water content, allowing efficient heating without moisture sensors by adjusting the resonant frequency based on water content changes during drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sensors are provided to measure moisture content and control high-frequency electric field power, then uniform drying can be achieved, but device complexity and cost increase
Solution Approach 1:
The heating device utilizes the liquid itself as the sensor. The liquid's dielectric properties (capacitance) automatically change with moisture content, providing self-diagnosis of the drying state without external sensors. The system controls heating based on this self-provided feedback from the liquid's inherent electrical characteristics.
Solution Approach 2:
The patent replaces mechanical/electrical sensors with an electrical field-based measurement system. Instead of using physical sensors to detect moisture, the system uses the liquid's dielectric constant changes (measured through capacitance) to infer moisture content, substituting a simpler electrical measurement approach for complex sensor-based detection.
2Productivity
If fixed driving frequency is used, then device simplicity is maintained, but heating efficiency decreases when water content changes
Solution Approach 1:
The driving frequency is made dynamic rather than fixed. The system automatically adjusts the driving frequency based on real-time changes in the liquid's water content, which changes the liquid's dielectric properties. This dynamic frequency adjustment maintains optimal heating efficiency throughout the drying process without requiring complex manual intervention.
Solution Approach 2:
The system changes the operating parameter (driving frequency) in response to changing conditions (water content). As the liquid dries and its dielectric properties change, the driving frequency is adjusted to match the changing characteristics, optimizing the coupling between the electric field and the liquid for maximum heating efficiency at each stage of drying.
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 uniform drying and efficient heating of liquids on a medium by dynamically adjusting the resonant frequency to match changing water content, reducing the need for moisture sensors and enhancing heating efficiency.
Implementation Method 1
a first heater, configured to heat and dry the liquid, having a first electrode and a second electrode facing a medium on which is deposited a liquid containing water
Implementation Method 2
a first heater configured such that a difference between a resonant frequency of the first heater and a driving frequency when a water content of the medium is in a first range is smaller than a difference between the resonant frequency of the first heater and the driving frequency when the water content is in a second range
Data Source
AI summary
A dielectric heating device includes a first heater, configured to heat and dry the liquid, having first electrode and the second electrode facing a medium on which is deposited a liquid containing water, and a first coil electrically coupled in series with the first electrode, and a voltage application section that applies an AC voltage having a predetermined driving frequency to the first electrode and the second electrode. The first heater is configured such that a difference between a resonant frequency of the first heater and the driving frequency when the water content of the medium is in a first range is smaller than the difference between the resonant frequency of the first heater and the driving frequency when the water content is in a second range smaller than the first range, and a heat amount, when the water content is in the first range, is larger than a heat amount, when the water content is in the second range.