Cooking appliance having a cover element with high reflectivity surface
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Solution Overview
Problem
Existing cooking oven baffles are difficult to clean due to contaminants adhering to surfaces and openings, which are hard to reach and tolerate high surface temperatures, leading to staining and food residue accumulation.
Innovation Solution
A cooking oven design featuring a cover element with a high thermal radiation reflectivity surface in the hot air chamber and a high emissivity surface in the cooking chamber, allowing for a temperature-sensitive easy-to-clean coating and reduced surface temperature, enabling efficient cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional baffle with slots and openings is used to direct hot air, then hot air circulation is achieved, but the surface temperature becomes too high causing contaminants to adhere and staining to occur
Solution Approach 1:
The patent applies different surface properties to different sides of the cover element. The first surface (cooking chamber side) has high emissivity for effective thermal radiation, while the second surface (hot air chamber side) has high reflectivity to reduce temperature. This local differentiation resolves the contradiction by allowing the high-temperature side to reflect radiation and stay cooler, preventing contaminant adhesion.
Solution Approach 2:
The cover element incorporates composite surface treatment with distinct emissivity and reflectivity characteristics on opposite surfaces. This composite approach enables one surface to efficiently emit thermal radiation while the other reflects radiation to maintain lower temperature, thus preventing staining and contaminant buildup.
2Ease of operation
If the baffle surface is designed with openings and slots for air flow, then convection heating is enabled, but the surface becomes difficult to clean due to food residue accumulation
Solution Approach 1:
The patent differentiates surface properties between the two sides of the cover element. The first surface facing the cooking chamber has high emissivity for thermal radiation efficiency, while the second surface facing the hot air chamber has high reflectivity to reduce temperature and prevent staining. This local quality differentiation simplifies cleaning requirements.
3Use of energy by moving object
If a high emissivity surface is used in the cooking chamber for effective heating, then thermal radiation efficiency is improved, but the surface temperature increases making it incompatible with easy-to-clean coatings
Solution Approach 1:
The patent applies different surface properties to different sides of the cover element. The first surface (cooking chamber side) has high emissivity for effective thermal radiation, while the second surface (hot air chamber side) has high reflectivity to reduce temperature. This local differentiation resolves the contradiction by allowing the high-temperature side to reflect radiation and stay cooler.
Solution Approach 2:
The cover element acts as an intermediary between the heating element and the cooking chamber. By positioning it strategically and applying appropriate surface treatments, it mediates thermal radiation transmission while managing surface temperatures to enable easy-to-clean coatings.
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 design reduces the surface temperature of the cooking chamber surface by 30-40°C, allowing for the use of easy-to-clean coatings and improving cleaning efficiency while maintaining effective hot air generation.
Implementation Method 1
the second surface comprises a reflectivity for thermal radiation that is higher than a reflectivity for thermal radiation of the first surface
Implementation Method 2
at least one thermal radiation emitting heating element for heating said cavity
Data Source
Figure 1~2
AI summary
A cooking appliance (1), in particular a domestic cooking oven, comprising: - a cavity (2) comprising at least one cavity wall defining a cooking chamber (4) for cooking foodstuff therein and an opening for placing foodstuff into the cooking chamber (4), - at least one thermal radiation emitting heating element (5) for heating said cavity (2), wherein the at least one heating element (5) is arranged within said cavity (2) adjacent to or in contact with the cavity wall (3), - at least one cover element (6) being arranged within the cavity (2), wherein the cover element (6) forms a partition wall between the cooking chamber (4) and a hot air chamber (7) in which hot air for heating the cooking chamber (4) can be generated by heating the at least one heating element (5), the cover element (6) comprises a first surface (6a) being directed to the cooking chamber (4) and a second surface (6b) being directed to the hot air chamber (7), characterised in that the second surface (6b) comprises a reflectivity for thermal radiation that is higher than a reflectivity for thermal radiation of the first surface (6a).