Drawer Heating Apparatus Curved Choke Gap Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional microwave heating apparatuses with turning-type openable doors face challenges in reliably suppressing radio-wave transmission due to uneven gaps between the choke portion and the heating chamber's inner wall surfaces, leading to incomplete microwave containment and a larger door size compared to the opening surface.
Innovation Solution
A drawer type heating apparatus with a curved heating case and openable door featuring a radio-wave transmission suppression portion with a stepped surface structure, ensuring a constant gap along the periphery and utilizing impedance transformation to achieve effective radio-wave suppression with a shorter length than the quarter-wavelength, allowing for a compact and lightweight door design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a turning-type openable door with a choke portion is used to suppress radio-wave transmission, then microwave containment is improved, but the door size becomes larger than the opening area of the heating chamber
Solution Approach 1:
The patent applies curvature by forming the inner wall surfaces of the heating chamber opening portion and the facing surfaces of the choke portion as curved surfaces. This curved configuration allows the choke portion to effectively suppress radio-wave transmission while maintaining a compact size, eliminating the need for the door to be larger than the opening area. The curved surfaces enable better electromagnetic wave interaction compared to flat surfaces.
Solution Approach 2:
The patent changes the geometric parameters of the choke portion by forming it with a curved surface and controlling the gap between the choke portion and the heating chamber inner wall surface. By optimizing these parameters, the choke portion achieves effective radio-wave suppression with reduced dimensions, resolving the contradiction between containment effectiveness and door size.
2Reliability
If the choke portion is faced to the inner wall surfaces of the heating chamber with a thickness of at least quarter-wavelength, then radio-wave transmission suppression is improved, but gaps between the choke portion and heating chamber wall become uneven and larger at corner portions
Solution Approach 1:
The patent uses curved surfaces for both the heating chamber inner wall and the choke portion to eliminate corner portions. This curvature ensures that the gap between the choke portion and the heating chamber wall remains substantially constant along the entire periphery, achieving uniform gap distribution and improved manufacturing precision while maintaining radio-wave suppression effectiveness.
3Reliability
If a curved surface configuration is used for the heating chamber opening and choke portion, then gap uniformity and radio-wave suppression are improved, but the door structure becomes more complex
Solution Approach 1:
The patent merges the curved surface configuration into an integrated design where the heating chamber opening portion and the choke portion are formed as unified curved structures. This integration achieves effective radio-wave suppression and uniform gap distribution while avoiding the need for separate complex components, thereby reducing overall structural complexity.
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 solution ensures reliable radio-wave suppression across the entire periphery, enabling a compact and efficient microwave heating apparatus with improved energy distribution and reduced heat generation, while allowing for a smaller door size and increased heating space.
Implementation Method 1
utilizing impedance transformation to achieve effective radio-wave suppression with a shorter length than the quarter-wavelength
Implementation Method 2
a microwave radiation portion adapted to radiate microwaves within a heating space in which an object to be heated is placed
Data Source
AI summary
A drawer type heating apparatus includes a heating case forming a heating space, and an openable door adapted to be moved in a drawing manner relative to the heating case for opening and closing an opening portion, and includes a radio-wave transmission suppression portion which is faced to inner wall surfaces of the opening portion of the heating case, and placed such that there is a predetermined gap between the radio-wave transmission suppression portion and the entire periphery of the inner wall surfaces of the opening portion in the heating case, in a state where the openable door is closed, the radio-wave transmission suppression portion including a first radio-wave-propagation-direction suppression-area constituted by a surface with a plurality of steps, and a second radio-wave-propagation-direction suppression-area having suppression protruding portions which are periodically formed and placed in such a way as to face the first radio-wave-propagation-direction suppression-area with a predetermined interval.