Dielectric Heating Electrode Structure for Uniform Field Distribution
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Solution Overview
Problem
Existing dielectric heating devices experience uneven heating due to locally weak electric field intensities near the second electrode, leading to inconsistent heating of objects.
Innovation Solution
The dielectric heating device features a second electrode that surrounds the first electrode, with a first conductor and a second conductor that protrudes from the first conductor, ensuring the second conductor is covered by the first conductor when projected perpendicular to the direction of the electric field, thereby reducing areas of weak electric field intensity and enhancing even heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a planar first electrode with circular hole and cylindrical second electrode are used to generate radial electric field, then objects can be heated evenly, but locally very weak electric field intensity occurs just below the second electrode resulting in uneven heating
Solution Approach 1:
The first electrode is segmented into a first conductor and a second conductor that protrudes from the first conductor toward the medium. This segmentation allows the electric field distribution to be optimized by having the second conductor extend into the region where the electric field was previously weak, thereby eliminating the uneven heating problem while maintaining the overall electrode structure.
Solution Approach 2:
The second conductor protrudes from the first conductor in the direction toward the medium, creating a three-dimensional electrode configuration. When projected onto a plane perpendicular to the first direction, the second conductor is covered by the first conductor, but the protrusion in the third dimension allows the electric field to be more uniformly distributed in the region just below the second electrode, resolving the heating uniformity issue.
2Area of stationary object
If the second electrode surrounds the first electrode to generate radial electric field, then heating coverage is improved, but areas of weak electric field intensity still occur leading to inconsistent heating
Solution Approach 1:
The second conductor is designed with a specific protrusion structure that targets the local region where electric field intensity was previously weak. By configuring the second conductor to extend into this specific area and be covered by the first conductor when projected onto a perpendicular plane, the electric field distribution is locally optimized without compromising the overall heating coverage provided by the surrounding second electrode.
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 configuration effectively suppresses the occurrence of weak electric field regions, allowing for more uniform heating of the medium, improving heating efficiency and consistency.
Implementation Method 1
an electrode unit having a first electrode and a second electrode that face the medium in a first direction and to which an AC voltage is applied, and heating the medium by a dielectric heating
Data Source
AI summary
A dielectric heating device includes a transport section that transports a medium; an electrode unit that has a first electrode and a second electrode facing the medium in a first direction and to which an AC voltage is applied, and that heats the medium by a dielectric heating; and a control section which controls the transport section, wherein the second electrode is located to surround the first electrode as viewed along the first direction, the first electrode includes a first conductor and a second conductor protruding from the first conductor toward the medium, and the second conductor is covered by the first conductor when projected onto a plane perpendicular to the first direction.