Microwave Oven Waveguide Cavity Coupling Design
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Solution Overview
Problem
The construction of microwave ovens with a common cavity wall and waveguide increases manufacturing costs and assembly complexity, as the cavity must be made from the same material as the waveguide, limiting customization and requiring additional parts for magnetron placement, which complicates assembly and reduces cavity volume.
Innovation Solution
A microwave oven design featuring a waveguide that is independent of the cavity, with a customizable cover that allows for personalized adaptation to each oven model, reducing the area required for fixing the waveguide and minimizing wave leakage, enabling a single cavity reference and simplified assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a common cavity wall with the waveguide is used, then the waveguide can be integrated into the cavity structure, but the cavity must be made from the same material as the waveguide which increases manufacturing costs and reduces customization flexibility
Solution Approach 1:
The waveguide is divided into two separate parts: the waveguide body and the cover. This segmentation allows the waveguide to be manufactured independently from the cavity, enabling different materials and manufacturing processes for each component, thus reducing overall manufacturing costs while maintaining customization flexibility.
Solution Approach 2:
The waveguide cover is extracted as a separate, customizable component that can be personalized for each oven model. This allows the cavity design to remain standardized while the cover can be adapted to different configurations, reducing the need to multiply cavity references.
2Ease of operation
If the magnetron is arranged above the cavity, then the waveguide can be supplied from above, but an additional part must be added between the waveguide and cavity which causes assembly difficulties
Solution Approach 1:
The waveguide cover integrates multiple functions: it closes the waveguide housing and provides the mounting interface for the magnetron. By combining these functions into a single component, the number of parts is reduced and assembly is simplified, eliminating the need for additional intermediate parts.
3Reliability
If the waveguide fixing means is placed on the periphery of the waveguide, then leaks between the cavity and waveguide can be prevented, but the fixing means covers a large area which increases complexity
Solution Approach 1:
The sealing function is localized to specific connection zones on the waveguide cover rather than requiring a large peripheral fixing area. This localized approach maintains effective sealing while reducing the overall area occupied by fixing means and simplifying the overall structure.
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 design optimizes the coupling of the waveguide and cavity, reduces manufacturing costs, and allows for flexible adaptation to different cooking modes, including the use of heating elements, while minimizing wave leakage and assembly difficulties.
Implementation Method 1
a waveguide (3) intended to supply electromagnetic waves to an oven cavity (2)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The oven (1) has a magnetron (4) to radiate an electromagnetic field in a wave guide (3) which is connected to a cavity (2) of the oven (1) through a wave outlet. The cavity has an opening (8) corresponding to opening (6) arranged on a wall (7) of the waveguide. The cavity has a base wall (10) and a shell (9) which has two lateral walls (11), a lower wall (12) and an upper wall (13). The wave guide has a case (14) and a cover (15), where the guide has a covering unit independent of a fixation unit of the guide.