Microwave Trap Bending Slots With Webs for Leakage Suppression
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Solution Overview
Problem
Conventional microwave traps in household appliances suffer from significant microwave leakage due to frequency deviations and evanescent field coupling, necessitating complex adjustments and structural compromises.
Innovation Solution
Introduce webs into the bending slots of microwave traps to align the effective frequency with the operating frequency and suppress evanescent field coupling, thereby reducing leakage radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional bending slots are used in microwave trap manufacturing, then the manufacturing process is simple, but significant microwave leakage occurs due to frequency deviations and evanescent field coupling
Solution Approach 1:
The bending slot is segmented into multiple sections by introducing webs that divide the continuous slot into discrete segments. This segmentation disrupts the continuous path for evanescent field coupling while maintaining the overall bending slot functionality for shaping the microwave trap during manufacturing.
Solution Approach 2:
Webs are introduced as intermediary elements within the bending slots. These webs act as mediators that block evanescent field coupling between adjacent teeth while allowing the bending process to proceed. The webs are strategically positioned to interrupt harmful electromagnetic field paths without compromising the structural integrity needed for manufacturing.
2Device complexity
If the microwave trap structure is simplified for easier manufacturing, then production complexity is reduced, but frequency alignment with operating frequency becomes difficult to achieve
Solution Approach 1:
The invention modifies the geometric parameters of the bending slots by introducing webs at specific positions and with specific dimensions. This changes the electrical characteristics of the trap structure, enabling better frequency alignment with the operating frequency while maintaining a relatively simple overall structure that is easy to manufacture.
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 modification significantly improves microwave sealing, aligning the effective frequency with simulations and reducing leakage rates by a factor of approximately 10, allowing for more flexible component placement and simpler manufacturing.
Implementation Method 1
The basic forms of shielding devices in household microwave ovens, based on the basic principle of a quarter-wave trap
Implementation Method 2
The microwave trap 106 is protected here by a cover 107 made of a microwave-transparent material
Data Source
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AI summary
A domestic microwave appliance (1) has a microwave treatment chamber (102), the loading opening (103) of which can be closed by means of a door (104), and at least one microwave trap (2) for preventing microwaves escaping when the door (104) is closed, the microwave trap (2) being a bent sheet-metal component (3) with a main bending edge (B3), which is adjoined by a row of teeth (113) at a distance, a row of bending slots (4) being present in the main bending edge (B3), of which at least one bending slot (4) is interrupted by at least one web (5). In a method for producing a microwave trap (2) of a domestic microwave appliance (1) from a sheet-metal component (3), bending slots (4) each having at least one web (5) are made in the sheet-metal component (3) along an intended main bending edge (B1) at a distance from a row of teeth (113) arranged on the remote edge, and the sheet-metal component (3) is bent at the main bending edge (B3). The invention can be particularly advantageously applied to microwave oven appliances.