Repositionable Electrode Defrosting System for Variable Load Sizes
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Solution Overview
Problem
Conventional capacitive food defrosting systems face inefficiencies due to variations in food load size, leading to uneven defrosting, as the electric field distribution is compromised by the large inner height of conventional heating systems, resulting in low defrosting efficiency or incomplete defrosting.
Innovation Solution
The use of repositionable electrodes and a variable impedance matching network in a defrosting system that adjusts to accommodate different load sizes by optimizing the distance between electrodes and impedance matching to concentrate the RF energy effectively, ensuring efficient and even defrosting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional large planar electrodes are used in a heating compartment with large inner height, then the system can accommodate various food loads, but the electric field distribution is compromised resulting in low defrosting efficiency and uneven defrosting
Solution Approach 1:
The patent employs repositionable electrodes that can be dynamically adjusted to different positions within the heating compartment. The electrodes are mounted on movable supports allowing them to be repositioned along guide rails, enabling the system to adapt to different food load sizes and configurations. This dynamic positioning capability resolves the contradiction by maintaining optimal electric field distribution regardless of the food load being processed.
Solution Approach 2:
The system utilizes adjustable electrode spacing as a key parameter to optimize defrosting performance. By changing the distance between electrodes based on the food load size, the system maintains uniform electric field intensity throughout the food. This parameter adjustment capability allows the system to accommodate various load sizes while preserving high defrosting efficiency and uniformity.
2Device complexity
If fixed position electrodes are used, then the system structure is simple, but variations in food load size result in inefficient and uneven defrosting
Solution Approach 1:
The electrode positioning system incorporates movable supports with guide rails that allow electrodes to be repositioned along the vertical axis. This dynamic structure enables adjustment of electrode spacing to match different food load heights, ensuring efficient and uniform defrosting while adding only moderate complexity to the overall system.
Solution Approach 2:
The repositionable electrode design serves multiple functions: it accommodates various food load sizes, maintains optimal electric field distribution, and provides flexibility for different defrosting scenarios. This multi-functionality justifies the additional structural complexity by delivering consistent high-performance defrosting across diverse operating conditions.
3Ease of operation
If electrode distance is not adjusted for different load sizes, then the system operation is simple, but the impedance mismatch results in poor power transfer and incomplete defrosting
Solution Approach 1:
The system incorporates adjustable electrode positioning that can be modified based on food load characteristics. This dynamic adjustment capability ensures proper impedance matching and optimal power transfer efficiency for different load sizes, thereby improving defrosting reliability while adding a straightforward adjustment mechanism to the operation process.
Solution Approach 2:
The electrode spacing is adjusted as a key parameter to match the impedance of the food load being defrosted. By changing the distance between electrodes according to the load size, the system achieves optimal power transfer efficiency and reliable defrosting performance, with the adjustment process designed to be simple and intuitive for users.
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 approach allows for flexible accommodation of various load sizes, maintaining high defrosting efficiency by concentrating the electric field and adjusting impedance to match changing load conditions, ensuring consistent and efficient thermal energy transfer.
Implementation Method 1
radio frequency (RF) energy... low power electromagnetic energy is supplied to the electrodes to provide controlled warming of the food load
Data Source
AI summary
A defrosting system includes a radio frequency (RF) signal source, at least one electrode proximate to a cavity within which a load to be defrosted is positioned, a transmission path between the RF signal source and the electrode, at least one bus bar in the transmission path that includes multiple ports to which the electrode may be coupled, a repositionable shelf that is attached to the electrode, and multiple support structures disposed at side-walls of the cavity that support the repositionable shelf. Standoff isolators may attach the electrode to the repositionable shelf and may electrically isolate the electrode from the repositionable shelf. The vertical position of the electrode may be changed by moving the repositionable shelf to be supported by different support structures of the multiple support structures while coupling the electrode to a different port of the multiple ports of the bus bar.