Multi-Panel Oven Door Glazing for Thermal Expansion Stability
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Solution Overview
Problem
Existing heat insulated oven doors with glass panels suffer from significant energy loss and instability due to heat expansion, particularly during pyrolytic cleaning, where temperature gradients cause stress and potential failure of seals.
Innovation Solution
The arrangement of three glass panels with a first intermediate space filled with silicone sealing and a second intermediate space filled with glass solder, where the silicone sealing maintains elasticity at high temperatures and the glass solder compensates for heat expansion differences, providing enhanced thermal stability and insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If glass panels are used in the oven door, then thermal insulation is improved, but heat expansion causes instability and seal failure
Solution Approach 1:
The oven door is divided into multiple glass panels (typically three or more) separated by intermediate spaces, creating a multi-layer insulating structure that reduces heat transfer while distributing thermal stress across separate components rather than a single large panel
Solution Approach 2:
The intermediate spaces between glass panels are filled with inert gases (such as argon or krypton) or evacuated to create vacuum insulation, significantly reducing thermal conductivity and improving insulation performance while maintaining structural stability under temperature variations
2Loss of energy
If intermediate spaces are evacuated or filled with inert gas, then thermal insulation is improved, but manufacturing complexity increases
Solution Approach 1:
Multiple glass panels and intermediate spaces are combined into a single integrated assembly where the panels are permanently sealed together at their edges, creating a pre-fabricated insulating unit that simplifies installation and reduces on-site manufacturing complexity
Solution Approach 2:
Edge sealants and bonding materials are used as intermediary substances to hermetically seal the intermediate spaces between glass panels, maintaining vacuum or inert gas fill while providing a robust manufacturing process that can be automated
3Stability of the object's composition
If glass panels are permanently connected, then structural stability is improved, but heat expansion differences cause stress and potential failure
Solution Approach 1:
The permanent connection system incorporates flexible sealants and expansion joints that can accommodate thermal expansion and contraction before stress builds up to failure levels, cushioning the structural assembly against thermal shocks during heating and cooling cycles
Solution Approach 2:
The connection system uses composite materials combining rigid structural elements with flexible sealing components, creating a hybrid joint that maintains structural integrity while allowing for differential thermal expansion between adjacent glass panels
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 configuration achieves superior thermal isolation and stability, even at high temperatures, reducing energy loss and preventing seal failure, thus improving cooking results and reducing energy consumption.
Implementation Method 1
the silicone sealing maintains its elastic properties at high temperatures
Implementation Method 2
the structure of the glass solder may by adapted to the neighboured glass panels in order to compensate the different heat expansions of said glass panels
Implementation Method 3
the structure of the glass solder may by adapted to the neighboured glass panels in order to compensate the different heat expansions of said glass panels
Implementation Method 4
An oven door of a cooking without any heat insulating devices causes a loss of energy
Implementation Method 5
This heat is transferred to the surrounding air by convection
Data Source
Figure 1~2
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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).