Dielectric Hair Styler With Fixed Electrodes to Prevent Arcing
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Solution Overview
Problem
Conventional hair styling appliances with heating plates require high temperatures, leading to inefficiencies and safety concerns due to power consumption and potential thermal conduction issues, as well as inconsistent heating and risk of arcing.
Innovation Solution
A hair styling appliance using dielectric heating with fixed-spaced electrodes and a drive unit to apply alternating voltage, reducing thermal conduction and ensuring consistent heating by maintaining a fixed electric field strength, while incorporating safety features to prevent arcing and foreign object insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heating plates are heated to high temperatures (around 200°C) to style hair, then hair can be reshaped and styled, but the appliance consumes significant power and poses safety risks due to high temperature surfaces
Solution Approach 1:
The patent replaces the conventional resistive heating system (heating plates) with a dielectric heating system using electrodes and an alternating voltage source. This substitution eliminates the need to heat large surface areas to high temperatures, thereby reducing power consumption while achieving the same hair styling function through direct dielectric heating of the hair.
Solution Approach 2:
The patent changes the heating mechanism from thermal conduction through heated plates to dielectric heating via alternating electric fields. By operating at high frequency (e.g., 2.45 GHz microwave frequency) and using a high-k dielectric material in contact with hair, the system achieves efficient heating at lower overall appliance temperatures, reducing both power consumption and safety risks.
2Temperature
If heating plates are heated to high temperatures to style hair, then hair can be reshaped, but the appliance poses safety risks due to potential thermal conduction to the user
Solution Approach 1:
The patent replaces the thermal conduction-based heating system with a dielectric heating system. The electrodes generate an alternating electric field that directly heats the hair through dielectric losses, eliminating the need for large heated surfaces that could conduct heat to the user. The appliance body remains relatively cool while the hair is heated internally by the electric field.
Solution Approach 2:
The patent introduces a high-k dielectric material as an intermediary between the electrodes and the hair. This dielectric material concentrates the electric field and enhances dielectric heating efficiency while acting as a thermal insulator, preventing direct thermal conduction from the heating zone to the appliance body and user contact surfaces.
3Adaptability or versatility
If electrodes have movable spacing to clamp hair, then the appliance can adapt to different hair thicknesses, but the electric field strength varies leading to inconsistent heating
Solution Approach 1:
The patent divides the hair clamping function from the heating function. The clamping mechanism (jaws or plates) is separated from the electrodes, allowing the electrodes to maintain a fixed spacing optimized for consistent electric field generation. The clamping structure adapts to different hair thicknesses without affecting the electrode spacing, thereby maintaining both adaptability and heating consistency.
Solution Approach 2:
The patent introduces a dielectric material as an intermediary that fills the space between the electrodes and hair. This dielectric ensures uniform electric field distribution and consistent coupling between the electric field and hair, regardless of variations in hair thickness or clamping pressure, thereby maintaining heating consistency while preserving adaptability.
4Stability of the object's composition
If electrodes have fixed spacing to maintain consistent electric field strength, then heating is more consistent, but the spacing must be carefully designed to prevent arcing and corona discharge
Solution Approach 1:
The patent carefully selects and optimizes the electrode spacing parameter to be sufficiently large to prevent arcing and corona discharge at the operating voltage and frequency, while remaining small enough to maintain consistent electric field strength across the hair section. This parameter optimization resolves the contradiction between consistent heating and preventing harmful electrical discharges.
Solution Approach 2:
The patent introduces a dielectric material as an intermediary between the electrodes and the surrounding environment. This dielectric increases the breakdown voltage of the gap, preventing arcing and corona discharge, while also ensuring uniform electric field distribution for consistent heating. The dielectric acts as a protective barrier that enables fixed electrode spacing without the risk of electrical breakdown.
5Temperature
If electrodes have fixed spacing to reduce thermal conduction to the appliance, then the appliance remains cooler, but the spacing must be optimized to achieve strong electric field without excessive power consumption
Solution Approach 1:
The patent optimizes multiple parameters including electrode spacing, alternating voltage frequency, and dielectric material properties to achieve efficient dielectric heating. By selecting the optimal frequency (e.g., 2.45 GHz) and dielectric constant, the system achieves strong electric field coupling with the hair while minimizing power consumption and thermal conduction to the appliance body.
Solution Approach 2:
The patent uses periodic alternating voltage at high frequency to generate dielectric heating. The periodic nature of the alternating field causes continuous polarization and depolarization of the dielectric and hair molecules, generating heat through molecular friction. This periodic action enables efficient energy transfer to the hair while the fixed electrode spacing and dielectric material prevent excessive heat transfer to the appliance.
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 appliance achieves efficient, consistent, and safer hair styling by minimizing thermal conduction and power consumption, ensuring reliable heating and preventing arcing, thus improving user satisfaction and safety.
Implementation Method 1
a drive unit for applying an alternating voltage to the electrodes to heat dielectrically hair within the chamber
Data Source
AI summary
A hair styling appliance is described having a pair of electrodes, a chamber located between the electrodes for receiving a section of hair, and a drive unit for applying an alternating voltage to the electrodes to heat the hair dielectrically. The electrodes have a fixed spacing.