Microwave oven
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Solution Overview
Problem
Commercial microwave ovens face challenges with insufficient space for frequency converter circuit boards and inadequate heat dissipation, leading to performance decline due to high temperature rises.
Innovation Solution
The microwave oven design features an oblique mounting of frequency converter circuit boards using a mounting support and base, combined with an air guide cover to facilitate cooling, reducing the height and improving heat dissipation, thus addressing space constraints and temperature issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If frequency converters are mounted vertically on the high-voltage transformer, then the original structure is preserved, but the mounting space is insufficient and the microwave oven cannot be miniaturized
Solution Approach 1:
The frequency converter circuit board is mounted obliquely at an angle between 15-75 degrees relative to the bottom plate, transitioning from traditional vertical or horizontal mounting. This angular installation utilizes three-dimensional space more efficiently, reducing the vertical height requirement while maintaining structural integrity and preserving the original transformer-based mounting approach.
2Volume of moving object
If frequency converters are mounted horizontally, then mounting space is saved, but heat dissipation is insufficient and performance declines due to high temperature rise
Solution Approach 1:
The oblique mounting angle optimizes the local spatial arrangement to enable effective heat dissipation. By positioning the frequency converter circuit board at an optimized angle, adequate space is created for air circulation and heat dissipation pathways, ensuring that thermal management requirements are met while maintaining compact dimensions.
3Volume of moving object
If the microwave oven is miniaturized, then mounting space becomes even more limited, but effective cooling of frequency converters becomes difficult
Solution Approach 1:
The oblique mounting configuration reconfigures the spatial relationship between the frequency converter circuit board and surrounding components, creating optimized pathways for cooling air flow within the miniaturized enclosure. This angular arrangement allows cooling fans to effectively reach the frequency converters while maintaining reduced overall dimensions.
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 effectively addresses the space limitations and temperature-related performance issues, ensuring reliable operation and miniaturization of the microwave oven while maintaining structural simplicity for manufacturing and repair.
Implementation Method 1
the air guide cover covers over the frequency converter circuit board and is used for guiding cool air blown by the cooling fan to the frequency converter circuit board
Data Source
AI summary
A microwave oven has a cooking cavity and an electrical chamber, with a magnetron, a frequency converter assembly and a cooling fan arranged in the electrical chamber. The frequency converter assembly has a mounting support mounted on a bottom plate of the microwave oven, a mounting base obliquely mounted on the mounting support, a frequency converter circuit board mounted on the mounting base and obliquely arranged relative to the bottom plate of the microwave oven, and an air guide cover covering over the frequency converter circuit board for guiding cool air blown by the cooling fan to the frequency converter circuit board. The microwave oven can not only solve the problem that the mounting space for frequency converter circuit boards is not sufficient, but also effectively control the temperature rise of the frequency converter circuit boards.