Oven Door Airflow Layout for Cooling and Fume Exhaust
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Solution Overview
Problem
Existing household cooking ovens face issues with ineffective air exhaust and condensation buildup due to inadequate design of the exhaust system, leading to poor thermal insulation and visibility problems.
Innovation Solution
A cooking oven design featuring a tangential fan-driven delivery duct with strategically positioned channels and slots to enhance air flow and mixing, along with a separate cooling system that directs air flow to prevent condensation on the outer surface, ensuring efficient thermal insulation and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the first and second channels are joined together close to the oven door, then the cooling effect on the door panes is improved, but the exhaust effectiveness of cooking fumes deteriorates
Solution Approach 1:
The delivery duct is segmented into functionally distinct zones: a first zone with the first channel for exhaust air flow, and a second zone with the second channel for cooling air flow. This spatial segmentation allows the exhaust and cooling functions to operate independently without interfering with each other, resolving the contradiction between cooling effectiveness and exhaust performance.
Solution Approach 2:
A partition wall is introduced as an intermediary structure between the first and second channels. This partition wall separates the exhaust air flow path from the cooling air flow path, preventing mixing of the two air streams while allowing both channels to be positioned close to the door for optimal cooling effect.
2Temperature
If the cooling system blows air into the gap between panes, then the thermal insulation of the door is improved, but condensation buildup on the outer wall increases
Solution Approach 1:
The harmful cooking fumes and moisture are extracted from the cooling air stream through the dedicated first channel that communicates with the oven interior. This removes the source of condensation before the air reaches the outer wall, allowing the cooling function to operate without causing condensation buildup.
Solution Approach 2:
The system uses controlled air flow dynamics to manage moisture transport. The fan-driven air flow through the separated channels creates a pneumatic system that directs moisture-laden exhaust air away from the outer wall while maintaining cooling effect on the door panes.
3Temperature
If a gap is formed between the first and second panes, then the heat transfer to the outer pane is reduced, but the visibility of the oven interior deteriorates
Solution Approach 1:
The door assembly employs local quality differentiation: the first pane and second pane are positioned to create a cooling gap in specific regions, while maintaining adequate visibility in other regions. The cooling system is localized to target areas requiring temperature control, preserving visibility in critical viewing zones.
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 effectively exhausts cooking fumes and prevents condensation on the outer wall, providing improved thermal insulation and visibility while maintaining efficient cooling of the oven door.
Implementation Method 1
a fan (11) and a delivery duct (12), which are adapted to blow a forced-air flow into said first gap (6A)
Implementation Method 2
a cooling system, generally designated by numeral 10, located above said muffle (3) and comprising a fan (11) and a delivery duct (12), which are adapted to blow a forced-air flow into said first gap (6A)
Implementation Method 3
exhaust means associated with an aperture (3A) in the muffle (3), for drawing air from within said muffle (3) and exhausting it out of the cooking oven (1)
Data Source
Figure 1
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AI summary
The present invention relates to a cooking oven (1), particularly for household use, of the type that comprises: - a cabinet (2) with a muffle (3) housed therein, the latter being adapted to be closed by a door (4), - first (5A) and second (5B) panes, which are adapted to create at least one first gap (6A) in said door (4), - a cooling system (10) located above said muffle (3) and comprising a fan (11) and a delivery duct (12), which are adapted to blow a forced-air flow into said first gap (6 A); - exhaust means (20) associated with an aperture (3A) in the muffle (3), for drawing air from within said muffle (3) and exhausting it out of the oven (1). The peculiarity of the invention is that said exhaust means (20) comprise: - a first channel (21) formed on an upper portion of said delivery duct (12) and adapted to draw at least one portion of the air processed by said fan (11); - a second channel (22) for the passage of air coming from said aperture (3A), said second channel (22) comprising a first section (22A) substantially facing the fan (11) and a second section (22B) having such orientation as to lie over the first channel (21).