Appliance for drying articles
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Solution Overview
Problem
Conventional microwave drying technologies for laundry can cause temporary runaway thermal effects due to random application of microwaves, making them undesirable for drying textiles, whereas radio frequency (RF) drying is more controlled but lacks efficient air flow mechanisms for uniform drying.
Innovation Solution
An RF laundry dryer with a perforated body supporting anode and cathode elements, coupled to an RF generator, and a fan system that directs air flow through the perforated body to create a controlled electromagnetic field for dielectric heating and efficient drying, while an electromagnetic shield protects the fan from the RF field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If microwave frequencies are used for drying laundry, then heating efficiency is improved, but thermal runaway effects occur making the process unsafe
Solution Approach 1:
The patent changes the electromagnetic frequency parameter from microwave range to radio frequency range (e.g., 13.56 MHz), which fundamentally alters the heating mechanism to eliminate thermal runaway while maintaining effective drying capability through dielectric heating of water molecules in the laundry
2Reliability
If radio frequency fields are used for drying textiles, then thermal runaway is avoided, but drying efficiency is reduced without proper air flow control
Solution Approach 1:
The patent merges RF dielectric heating with forced air circulation through the integration of heating elements and air flow paths, combining two drying mechanisms to achieve both safety (RF heating without thermal runaway) and efficiency (enhanced by air flow removing moisture)
Solution Approach 2:
The patent introduces pneumatic air flow control through fans and ducts to force air through the laundry, using fluid dynamics to enhance moisture removal and improve drying productivity while maintaining the safe RF heating process
3Manufacturing precision
If air flow is increased through the drying chamber, then drying uniformity is improved, but interference with the electromagnetic field occurs
Solution Approach 1:
The patent introduces electromagnetic shields as intermediary components that physically separate the air flow paths from the RF field generation zones, allowing both functions (air circulation for uniform drying and RF field generation) to operate simultaneously without harmful interference
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 RF laundry dryer achieves deterministic power application and efficient drying of textiles by dielectrically heating water in clothing, with uniform air flow through the perforated body, reducing thermal runaway risks and enhancing drying efficiency.
Implementation Method 1
When applying an RF electronic field (e-field) to a wet article, such as a clothing material, the e-field may cause the water molecules within the e-field to dielectrically heat, generating thermal energy that effects the rapid drying of the articles
Implementation Method 2
a fan arranged relative to the perforated body to flow or draw air through the perforated body
Data Source
AI summary
An RF laundry dryer includes, amongst other things, an RF generator, an RF applicator having a perforated body supporting anode and cathode elements, a fan arranged relative to the perforated body to flow or draw air through the perforated body and an electromagnetic shield protecting the fan from the e-field. Both anode and cathode elements are operably coupled to the RF generator to generate an e-field between the anode and cathode upon the energizing of the RF generator.