Oven door assembly
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Solution Overview
Problem
Conventional oven door assemblies face challenges in maximizing the size of the viewing window while maintaining cost-effectiveness and safety, as insulation and framing requirements restrict the window size and increase manufacturing costs.
Innovation Solution
The door assembly employs a pair of inner brackets to compressively retain the inner glass panel against the inner frame, creating an air gap between the inner and outer glass panels, which allows air flow for insulation and cooling, eliminating the need for additional insulation and reducing material usage, thereby minimizing costs and maximizing the viewing window size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If insulation and framing are added to hold insulation in place, then heat transfer from cooking cavity is minimized, but manufacturing cost increases and viewing window size is restricted
Solution Approach 1:
The patent removes the insulation material and framing components from the door assembly, retaining only the essential structural elements (inner frame, outer frame, and glass panels). The air space between the inner and outer frames provides sufficient thermal insulation without requiring additional insulation materials, thereby eliminating the need for framing to hold insulation in place.
Solution Approach 2:
The patent utilizes air as an inert insulating medium between the inner and outer frames. This air space acts as a thermal barrier, providing insulation without occupying the space needed for a large viewing window, thus resolving the contradiction between heat transfer prevention and viewing window size.
2Loss of energy
If insulation and framing are added to hold insulation in place, then heat transfer from cooking cavity is minimized, but manufacturing cost increases
Solution Approach 1:
The patent eliminates insulation materials and framing components from the door assembly, significantly reducing the bill of materials and manufacturing complexity. The simplified structure requires fewer parts and assembly steps, directly lowering manufacturing costs while maintaining adequate thermal insulation through the air space design.
Solution Approach 2:
The patent replaces expensive insulation materials and framing with a simple air space configuration, using the most economical solution (air) to achieve thermal insulation. This approach minimizes material costs and simplifies manufacturing without compromising the insulating function.
3Ease of manufacture
If fewer brackets are used to retain glass panels, then material usage is reduced and costs are lowered, but viewing window size is restricted
Solution Approach 1:
The patent removes unnecessary brackets and framing elements that would restrict the viewing window size. By using only the essential inner frame and outer frame structures, the design maximizes the glass panel area while minimizing material usage, achieving both cost reduction and larger viewing windows simultaneously.
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 design effectively insulates and cools the outer glass panel, reducing the risk of burns and lowering production costs by eliminating the need for insulation, while allowing for a larger viewing window, thus enhancing user safety and cost-efficiency.
Implementation Method 1
air flow for insulation and cooling
Implementation Method 2
air gap between the inner and outer glass panels that allows air flow for insulation and cooling
Data Source
AI summary
A door assembly for an oven comprises an inner frame, a first glass panel and a first pair of brackets coupled with the inner frame and compressively retaining the first glass panel against the inner frame.