Oven Impeller Air Guide Layout for Even Multi-Rack Cooking
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Solution Overview
Problem
Conventional oven convection systems often result in uneven cooking and centralized browning due to limitations in air circulation and heat distribution, lacking efficient mechanisms to combine radiant and convective heating effectively.
Innovation Solution
The design incorporates a rotatable impeller assembly with air guides that direct airflow transversely across heating elements, creating opposing flow paths and air cells within the cooking cavity, enhancing air circulation and heat distribution for more even cooking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a fan-forced convection mode is used with radiant heat elements inside the cooking cavity, then direct heat is applied to cook food, but centralized browning occurs on planar surfaces resulting in uneven cooking
Solution Approach 1:
The cooking cavity is divided into multiple airflow zones using air guides that create separate flow paths. The impeller assembly segments the air circulation into distinct cells, preventing centralized heat concentration and promoting uniform heat distribution across different rack positions.
Solution Approach 2:
Heating elements are positioned at specific locations outside the cooking cavity, with air guides directing heated air to specific zones. This creates localized heating regions that collectively provide uniform overall heating, preventing centralized browning while maintaining efficient heat transfer.
2Device complexity
If conventional convection systems are used with limited air circulation, then simplified heating is achieved, but uneven cooking occurs due to poor heat distribution
Solution Approach 1:
The impeller assembly creates dynamic air circulation with rotating blades that actively move air through defined paths. This dynamic airflow system maintains stable temperatures by continuously refreshing air around food, preventing stagnant zones while keeping the system structurally simple.
Solution Approach 2:
Air guides act as intermediaries between the heating elements and the cooking cavity, directing heated air through controlled paths. This intermediary structure simplifies the overall system by providing straightforward airflow management while ensuring stable and uniform temperature distribution.
3Volume of moving object
If heating elements are positioned close to the impeller assembly, then compact design is achieved, but motor overheating occurs due to proximity to heat source
Solution Approach 1:
The air guides are positioned asymmetrically between the impeller and heating elements, creating an uneven airflow distribution that directs cool air toward the motor while allowing heated air to reach the cooking cavity. This asymmetric arrangement maintains compact dimensions while protecting the motor from overheating.
4Reliability
If air guides are positioned between the impeller and heating elements, then motor protection from heat is achieved, but airflow path complexity increases
Solution Approach 1:
The air guides extend in the transverse dimension, perpendicular to the main airflow direction. This dimensional arrangement allows the air guides to protect the motor from heat while maintaining simple axial airflow paths, avoiding the need for complex multi-directional airflow management.
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 ensures more stable temperatures and faster cooking times by reducing the boundary layer of air around food, resulting in even cooking across multiple rack positions and providing a visual indication of the oven's operating state through reflected thermal radiation.
Implementation Method 1
convection energy cooks food with non-direct heat applied to the food via air circulation from a fan
Implementation Method 2
thermal electromagnetic radiation emitted from each of the heating elements is reflected into the cavity to provide a visual indication of an operating state of the oven
Implementation Method 3
air that is directed from the impeller travels transversely along the channels of the air guides, across the heating elements
Data Source
AI summary
An oven (1000) having a body (1002) that includes a base, a ceiling, and side walls extending between the base and the ceiling, the side walls at least partly surrounding a cooking cavity (1030), the oven (1000) including:an impeller assembly (1060) mounted to a first side wall of the oven body, the impeller assembly (1060) including:an impeller (1062) that is rotatable to direct air flow within the cooking cavity (1030);a plurality of air guides (2006) that at least partially surround the impeller (1062), the air guides (2006) each defining a channel that extends generally transversely from a central axis of the impeller (1062); anda pair of heating elements (2010) located on either side of the impeller (1062), whereby air that is directed from the impeller (1062) travels transversely along the channels of the air guides (2006), across the heating elements (2010), and into the cooking cavity (1030).