Multi-Layer Glass Panel Assembly for Oven Door Thermal Insulation
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Solution Overview
Problem
Conventional oven doors with glass panels suffer from significant energy loss and instability due to heat expansion and gas pressure, especially during pyrolytic cleaning, which leads to reduced thermal insulation effectiveness.
Innovation Solution
The use of silicone foam sealings and glass solder adapted to high temperatures, with a specific arrangement of inert gas-filled and evacuated spaces between glass panels, along with a supporting structure, to compensate for heat expansions and maintain thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional glass panels are used in oven doors, then the structure is simple and easy to manufacture, but significant energy loss occurs and thermal instability arises due to heat expansion and gas pressure
Solution Approach 1:
The glass panel assembly is segmented into multiple glass panels (at least two) separated by intermediate spaces. These spaces can be evacuated or filled with inert gas, creating a multi-layer insulating structure that significantly reduces heat transfer compared to a single glass panel, while maintaining manufacturing feasibility through modular assembly
Solution Approach 2:
The patent employs a nested structure where intermediate spaces are positioned between multiple glass panels, creating concentric insulating layers. This nested arrangement of glass panels and vacuum/inert gas spaces provides enhanced thermal insulation without requiring a completely different structural approach, thus reducing energy loss while controlling complexity
2Temperature
If glass panels are heated by oven heat, then thermal insulation is provided, but heat expansion causes instabilities and motions of the glass panels
Solution Approach 1:
The silicone sealing material is specifically selected to have local quality properties that match the thermal expansion characteristics of glass panels. This silicone sealing maintains its elastic properties at high temperatures and is adapted to the heat expansion behavior of glass, allowing it to compensate for differential expansion between the glass panels and sealing material, thereby maintaining structural stability under thermal stress
Solution Approach 2:
The patent changes the material parameter of the sealing from conventional materials to silicone-based sealing that maintains elasticity at high temperatures. This parameter change allows the sealing to accommodate thermal expansion and contraction of glass panels without losing its sealing effectiveness or causing structural instability during temperature variations
3Reliability
If silicone foam sealing is used to seal intermediate spaces, then the sealing adapts to heat expansion and maintains stability, but the device complexity increases
Solution Approach 1:
Silicone foam sealing is used to seal the intermediate spaces between glass panels. The foam structure provides both sealing and cushioning functions, adapting to thermal expansion and contraction of the glass panels. The porous structure of the foam allows it to compress and expand with temperature changes while maintaining the seal, thereby improving reliability without requiring complex additional components
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 arrangement significantly reduces heat conductivity, enhances thermal stability, and improves energy efficiency, even at high temperatures, preventing uneven browning and maintaining insulation effectiveness in pyrolytic ovens.
Implementation Method 1
the different heat expansions of the components lead to instabilities
Implementation Method 2
the silicone sealing maintains its elastic properties at high temperatures
Implementation Method 3
The different heat expansions of the components lead to instabilities
Implementation Method 4
The intermediate spaces between said glass panels may be evacuated
Implementation Method 5
The intermediate spaces between said glass panels may be evacuated
Data Source
AI summary
The present invention relates to a arrangement of at least two glass panels (12, 14, 16) for a heat insulated oven door (10) of a cooking oven. The arrangement of the glass panels (12, 14, 16) is provided as or for a window of the oven door (10). The large-area sides of said glass panels (12, 14, 16) are arranged in parallel. Two neighbored glass panels (12, 14, 16) are arranged with a predetermined distance from each other, so that an intermediate space (24, 24', 24'') is formed between said neighbored glass panels (12, 14, 16).