Oven Cavity Lighting With External Cooling and Heat Insulation
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Solution Overview
Problem
Existing oven lighting systems face challenges in managing the high operating temperatures of light sources, leading to potential overheating, especially when using high-thermal-emission light sources, without requiring complex structural measures or thermal insulation.
Innovation Solution
A cooling system utilizing a heat sink with good thermal conductivity, such as a metallic oven housing, and a cooling air flow to dissipate heat energy from the light source outside the cooking chamber, combined with a transparent or translucent insulating material like silicate aerogel to manage internal heat and ensure safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thermal insulation material is arranged between the boundary wall and the light source to reduce heat radiation and heat conduction, then the light source is protected from overheating, but the device complexity increases and the manufacturing becomes more difficult
Solution Approach 1:
The light source is extracted from the high-temperature treatment chamber environment and positioned in the cooler outer region, separating the light-emitting function from the high-temperature cooking environment. This eliminates the need for complex thermal insulation structures between the light source and treatment chamber.
Solution Approach 2:
A transparent cover is introduced as an intermediary element that allows light to pass through while providing a thermal barrier. This simple mediator structure enables the light source to be positioned outside the treatment chamber while still illuminating the interior, without requiring complex insulation arrangements.
2Object-affected harmful factors
If a transparent or translucent porous material such as silicate aerogel is used as insulating material, then heat radiation and heat conduction are reduced, but the manufacturing precision requirements increase and the ease of manufacture decreases
Solution Approach 1:
The patent employs a simple transparent cover made of conventional materials rather than expensive specialized aerogel insulation. This simpler, more manufacturable solution achieves sufficient thermal protection without the manufacturing complexity and cost of advanced porous insulation materials.
3Temperature
If the light source is surrounded by a flow of cooling medium or placed in a cooling air chamber, then the light source operating temperature is controlled, but the device complexity increases
Solution Approach 1:
The cooling air flow that is already present in the oven cavity for other operational purposes serves the additional function of cooling the light source. The light source is positioned in the path of this existing cooling air flow, allowing it to self-cool without requiring dedicated cooling structures or additional insulation layers.
4Loss of energy
If a metallic wall with good thermal conductivity is used as heat sink to dissipate heat from the light source, then heat dissipation efficiency is improved, but the ease of manufacture decreases due to the need for thermal bridging structures
Solution Approach 1:
The metallic support structure that mechanically holds the light source is merged with the thermal management function by making it thermally conductive. This single integrated structure serves both as the mounting carrier and as a heat sink, eliminating the need for separate thermal bridging components and simplifying manufacturing.
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 solution effectively prevents the maximum permissible temperature from being exceeded, allowing the use of all light sources, including high-thermal-emission ones, by efficiently dissipating heat into cooler zones outside the cooking area, ensuring reliable and safe operation.
Implementation Method 1
The cooling medium can consist of a z. B. forced cooling air flow by means of a cooling fan
Implementation Method 2
The heat is dissipated predominantly by heat conduction, in that the wall has a metallic connecting element which bridges the distance between the wall and the light source
Implementation Method 3
A transparent or translucent porous material such as a silicate airgel is proposed as the insulating material
Implementation Method 4
The cooling medium consists of a heat sink with good thermal conductivity. In this way, the large cooling potential, which largely consists of material with good thermal conductivity, is used to dissipate the operating heat of the at least one light source
Data Source
AI summary
The device has a thermally high-loaded light source (11) e.g. incandescent lamp and LED, arranged outside a processing chamber (2) of a baking oven and attached to the processing chamber. The light source and/or lamp housing (9) and a carrier (15) of the light source are in direct connection with a heat dissipating cooling medium i.e. cooling air stream. The lamp housing is formed as a light-conductive reflector element for a lamp (4), and has a filling (13) made of a transparent or translucent heat insulating material such as silicate aerogel.